1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
9 * Copyright (C) 2018-2021 Intel Corporation
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 <linux/kcov.h>
21 #include <linux/bitops.h>
22 #include <net/mac80211.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
37 * monitor mode reception
39 * This function cleans up the SKB, i.e. it removes all the stuff
40 * only useful for monitoring.
42 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
43 unsigned int present_fcs_len,
44 unsigned int rtap_space)
46 struct ieee80211_hdr *hdr;
51 __pskb_trim(skb, skb->len - present_fcs_len);
52 __pskb_pull(skb, rtap_space);
54 hdr = (void *)skb->data;
55 fc = hdr->frame_control;
58 * Remove the HT-Control field (if present) on management
59 * frames after we've sent the frame to monitoring. We
60 * (currently) don't need it, and don't properly parse
61 * frames with it present, due to the assumption of a
62 * fixed management header length.
64 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
67 hdrlen = ieee80211_hdrlen(fc);
68 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
70 if (!pskb_may_pull(skb, hdrlen)) {
75 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
76 hdrlen - IEEE80211_HT_CTL_LEN);
77 __pskb_pull(skb, IEEE80211_HT_CTL_LEN);
82 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
83 unsigned int rtap_space)
85 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
86 struct ieee80211_hdr *hdr;
88 hdr = (void *)(skb->data + rtap_space);
90 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
91 RX_FLAG_FAILED_PLCP_CRC |
92 RX_FLAG_ONLY_MONITOR |
96 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
99 if (ieee80211_is_ctl(hdr->frame_control) &&
100 !ieee80211_is_pspoll(hdr->frame_control) &&
101 !ieee80211_is_back_req(hdr->frame_control))
108 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
109 struct ieee80211_rx_status *status,
114 /* always present fields */
115 len = sizeof(struct ieee80211_radiotap_header) + 8;
117 /* allocate extra bitmaps */
119 len += 4 * hweight8(status->chains);
120 /* vendor presence bitmap */
121 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
124 if (ieee80211_have_rx_timestamp(status)) {
128 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
131 /* antenna field, if we don't have per-chain info */
135 /* padding for RX_FLAGS if necessary */
138 if (status->encoding == RX_ENC_HT) /* HT info */
141 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
146 if (status->encoding == RX_ENC_VHT) {
151 if (local->hw.radiotap_timestamp.units_pos >= 0) {
156 if (status->encoding == RX_ENC_HE &&
157 status->flag & RX_FLAG_RADIOTAP_HE) {
160 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
163 if (status->encoding == RX_ENC_HE &&
164 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
167 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
170 if (status->flag & RX_FLAG_NO_PSDU)
173 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
176 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
179 if (status->chains) {
180 /* antenna and antenna signal fields */
181 len += 2 * hweight8(status->chains);
184 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
185 struct ieee80211_vendor_radiotap *rtap;
186 int vendor_data_offset = 0;
189 * The position to look at depends on the existence (or non-
190 * existence) of other elements, so take that into account...
192 if (status->flag & RX_FLAG_RADIOTAP_HE)
193 vendor_data_offset +=
194 sizeof(struct ieee80211_radiotap_he);
195 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
196 vendor_data_offset +=
197 sizeof(struct ieee80211_radiotap_he_mu);
198 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
199 vendor_data_offset +=
200 sizeof(struct ieee80211_radiotap_lsig);
202 rtap = (void *)&skb->data[vendor_data_offset];
204 /* alignment for fixed 6-byte vendor data header */
206 /* vendor data header */
208 if (WARN_ON(rtap->align == 0))
210 len = ALIGN(len, rtap->align);
211 len += rtap->len + rtap->pad;
217 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
218 struct sta_info *sta,
221 skb_queue_tail(&sdata->skb_queue, skb);
222 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
224 sta->rx_stats.packets++;
227 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
228 struct sta_info *sta,
232 __ieee80211_queue_skb_to_iface(sdata, sta, skb);
235 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
240 struct ieee80211_hdr_3addr hdr;
243 } __packed __aligned(2) action;
248 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
250 if (skb->len < rtap_space + sizeof(action) +
251 VHT_MUMIMO_GROUPS_DATA_LEN)
254 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
257 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
259 if (!ieee80211_is_action(action.hdr.frame_control))
262 if (action.category != WLAN_CATEGORY_VHT)
265 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
268 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
271 skb = skb_copy(skb, GFP_ATOMIC);
275 ieee80211_queue_skb_to_iface(sdata, NULL, skb);
279 * ieee80211_add_rx_radiotap_header - add radiotap header
281 * add a radiotap header containing all the fields which the hardware provided.
284 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
286 struct ieee80211_rate *rate,
287 int rtap_len, bool has_fcs)
289 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
290 struct ieee80211_radiotap_header *rthdr;
295 u16 channel_flags = 0;
297 unsigned long chains = status->chains;
298 struct ieee80211_vendor_radiotap rtap = {};
299 struct ieee80211_radiotap_he he = {};
300 struct ieee80211_radiotap_he_mu he_mu = {};
301 struct ieee80211_radiotap_lsig lsig = {};
303 if (status->flag & RX_FLAG_RADIOTAP_HE) {
304 he = *(struct ieee80211_radiotap_he *)skb->data;
305 skb_pull(skb, sizeof(he));
306 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
309 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
310 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
311 skb_pull(skb, sizeof(he_mu));
314 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
315 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
316 skb_pull(skb, sizeof(lsig));
319 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
320 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
321 /* rtap.len and rtap.pad are undone immediately */
322 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
326 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
329 rthdr = skb_push(skb, rtap_len);
330 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
331 it_present = &rthdr->it_present;
333 /* radiotap header, set always present flags */
334 rthdr->it_len = cpu_to_le16(rtap_len);
335 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
336 BIT(IEEE80211_RADIOTAP_CHANNEL) |
337 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
340 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
342 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
344 BIT(IEEE80211_RADIOTAP_EXT) |
345 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
346 put_unaligned_le32(it_present_val, it_present);
348 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
349 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
352 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
353 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
354 BIT(IEEE80211_RADIOTAP_EXT);
355 put_unaligned_le32(it_present_val, it_present);
357 it_present_val = rtap.present;
360 put_unaligned_le32(it_present_val, it_present);
362 /* This references through an offset into it_optional[] rather
363 * than via it_present otherwise later uses of pos will cause
364 * the compiler to think we have walked past the end of the
367 pos = (void *)&rthdr->it_optional[it_present - rthdr->it_optional];
369 /* the order of the following fields is important */
371 /* IEEE80211_RADIOTAP_TSFT */
372 if (ieee80211_have_rx_timestamp(status)) {
374 while ((pos - (u8 *)rthdr) & 7)
377 ieee80211_calculate_rx_timestamp(local, status,
380 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
384 /* IEEE80211_RADIOTAP_FLAGS */
385 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
386 *pos |= IEEE80211_RADIOTAP_F_FCS;
387 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
388 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
389 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
390 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
393 /* IEEE80211_RADIOTAP_RATE */
394 if (!rate || status->encoding != RX_ENC_LEGACY) {
396 * Without rate information don't add it. If we have,
397 * MCS information is a separate field in radiotap,
398 * added below. The byte here is needed as padding
399 * for the channel though, so initialise it to 0.
404 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
405 if (status->bw == RATE_INFO_BW_10)
407 else if (status->bw == RATE_INFO_BW_5)
409 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
413 /* IEEE80211_RADIOTAP_CHANNEL */
414 /* TODO: frequency offset in KHz */
415 put_unaligned_le16(status->freq, pos);
417 if (status->bw == RATE_INFO_BW_10)
418 channel_flags |= IEEE80211_CHAN_HALF;
419 else if (status->bw == RATE_INFO_BW_5)
420 channel_flags |= IEEE80211_CHAN_QUARTER;
422 if (status->band == NL80211_BAND_5GHZ ||
423 status->band == NL80211_BAND_6GHZ)
424 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
425 else if (status->encoding != RX_ENC_LEGACY)
426 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
427 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
428 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
430 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
432 channel_flags |= IEEE80211_CHAN_2GHZ;
433 put_unaligned_le16(channel_flags, pos);
436 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
437 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
438 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
439 *pos = status->signal;
441 cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
445 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
447 if (!status->chains) {
448 /* IEEE80211_RADIOTAP_ANTENNA */
449 *pos = status->antenna;
453 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
455 /* IEEE80211_RADIOTAP_RX_FLAGS */
456 /* ensure 2 byte alignment for the 2 byte field as required */
457 if ((pos - (u8 *)rthdr) & 1)
459 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
460 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
461 put_unaligned_le16(rx_flags, pos);
464 if (status->encoding == RX_ENC_HT) {
467 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
468 *pos++ = local->hw.radiotap_mcs_details;
470 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
471 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
472 if (status->bw == RATE_INFO_BW_40)
473 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
474 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
475 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
476 if (status->enc_flags & RX_ENC_FLAG_LDPC)
477 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
478 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
479 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
481 *pos++ = status->rate_idx;
484 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
487 /* ensure 4 byte alignment */
488 while ((pos - (u8 *)rthdr) & 3)
491 cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
492 put_unaligned_le32(status->ampdu_reference, pos);
494 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
495 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
496 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
497 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
498 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
499 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
500 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
501 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
502 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
503 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
504 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
505 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
506 put_unaligned_le16(flags, pos);
508 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
509 *pos++ = status->ampdu_delimiter_crc;
515 if (status->encoding == RX_ENC_VHT) {
516 u16 known = local->hw.radiotap_vht_details;
518 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
519 put_unaligned_le16(known, pos);
522 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
523 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
524 /* in VHT, STBC is binary */
525 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
526 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
527 if (status->enc_flags & RX_ENC_FLAG_BF)
528 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
531 switch (status->bw) {
532 case RATE_INFO_BW_80:
535 case RATE_INFO_BW_160:
538 case RATE_INFO_BW_40:
545 *pos = (status->rate_idx << 4) | status->nss;
548 if (status->enc_flags & RX_ENC_FLAG_LDPC)
549 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
557 if (local->hw.radiotap_timestamp.units_pos >= 0) {
559 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
562 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
564 /* ensure 8 byte alignment */
565 while ((pos - (u8 *)rthdr) & 7)
568 put_unaligned_le64(status->device_timestamp, pos);
571 if (local->hw.radiotap_timestamp.accuracy >= 0) {
572 accuracy = local->hw.radiotap_timestamp.accuracy;
573 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
575 put_unaligned_le16(accuracy, pos);
578 *pos++ = local->hw.radiotap_timestamp.units_pos;
582 if (status->encoding == RX_ENC_HE &&
583 status->flag & RX_FLAG_RADIOTAP_HE) {
584 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
586 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
587 he.data6 |= HE_PREP(DATA6_NSTS,
588 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
590 he.data3 |= HE_PREP(DATA3_STBC, 1);
592 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
595 #define CHECK_GI(s) \
596 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
597 (int)NL80211_RATE_INFO_HE_GI_##s)
603 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
604 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
605 he.data3 |= HE_PREP(DATA3_CODING,
606 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
608 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
610 switch (status->bw) {
611 case RATE_INFO_BW_20:
612 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
613 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
615 case RATE_INFO_BW_40:
616 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
617 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
619 case RATE_INFO_BW_80:
620 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
621 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
623 case RATE_INFO_BW_160:
624 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
625 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
627 case RATE_INFO_BW_HE_RU:
628 #define CHECK_RU_ALLOC(s) \
629 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
630 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
638 CHECK_RU_ALLOC(2x996);
640 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
644 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
647 /* ensure 2 byte alignment */
648 while ((pos - (u8 *)rthdr) & 1)
650 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
651 memcpy(pos, &he, sizeof(he));
655 if (status->encoding == RX_ENC_HE &&
656 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
657 /* ensure 2 byte alignment */
658 while ((pos - (u8 *)rthdr) & 1)
660 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
661 memcpy(pos, &he_mu, sizeof(he_mu));
662 pos += sizeof(he_mu);
665 if (status->flag & RX_FLAG_NO_PSDU) {
667 cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
668 *pos++ = status->zero_length_psdu_type;
671 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
672 /* ensure 2 byte alignment */
673 while ((pos - (u8 *)rthdr) & 1)
675 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
676 memcpy(pos, &lsig, sizeof(lsig));
680 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
681 *pos++ = status->chain_signal[chain];
685 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
686 /* ensure 2 byte alignment for the vendor field as required */
687 if ((pos - (u8 *)rthdr) & 1)
689 *pos++ = rtap.oui[0];
690 *pos++ = rtap.oui[1];
691 *pos++ = rtap.oui[2];
693 put_unaligned_le16(rtap.len, pos);
695 /* align the actual payload as requested */
696 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
698 /* data (and possible padding) already follows */
702 static struct sk_buff *
703 ieee80211_make_monitor_skb(struct ieee80211_local *local,
704 struct sk_buff **origskb,
705 struct ieee80211_rate *rate,
706 int rtap_space, bool use_origskb)
708 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
709 int rt_hdrlen, needed_headroom;
712 /* room for the radiotap header based on driver features */
713 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
714 needed_headroom = rt_hdrlen - rtap_space;
717 /* only need to expand headroom if necessary */
722 * This shouldn't trigger often because most devices have an
723 * RX header they pull before we get here, and that should
724 * be big enough for our radiotap information. We should
725 * probably export the length to drivers so that we can have
726 * them allocate enough headroom to start with.
728 if (skb_headroom(skb) < needed_headroom &&
729 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
735 * Need to make a copy and possibly remove radiotap header
736 * and FCS from the original.
738 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
745 /* prepend radiotap information */
746 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
748 skb_reset_mac_header(skb);
749 skb->ip_summed = CHECKSUM_UNNECESSARY;
750 skb->pkt_type = PACKET_OTHERHOST;
751 skb->protocol = htons(ETH_P_802_2);
757 * This function copies a received frame to all monitor interfaces and
758 * returns a cleaned-up SKB that no longer includes the FCS nor the
759 * radiotap header the driver might have added.
761 static struct sk_buff *
762 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
763 struct ieee80211_rate *rate)
765 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
766 struct ieee80211_sub_if_data *sdata;
767 struct sk_buff *monskb = NULL;
768 int present_fcs_len = 0;
769 unsigned int rtap_space = 0;
770 struct ieee80211_sub_if_data *monitor_sdata =
771 rcu_dereference(local->monitor_sdata);
772 bool only_monitor = false;
773 unsigned int min_head_len;
775 if (status->flag & RX_FLAG_RADIOTAP_HE)
776 rtap_space += sizeof(struct ieee80211_radiotap_he);
778 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
779 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
781 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
782 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
784 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
785 struct ieee80211_vendor_radiotap *rtap =
786 (void *)(origskb->data + rtap_space);
788 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
791 min_head_len = rtap_space;
794 * First, we may need to make a copy of the skb because
795 * (1) we need to modify it for radiotap (if not present), and
796 * (2) the other RX handlers will modify the skb we got.
798 * We don't need to, of course, if we aren't going to return
799 * the SKB because it has a bad FCS/PLCP checksum.
802 if (!(status->flag & RX_FLAG_NO_PSDU)) {
803 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
804 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
807 dev_kfree_skb(origskb);
810 present_fcs_len = FCS_LEN;
813 /* also consider the hdr->frame_control */
817 /* ensure that the expected data elements are in skb head */
818 if (!pskb_may_pull(origskb, min_head_len)) {
819 dev_kfree_skb(origskb);
823 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
825 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
827 dev_kfree_skb(origskb);
831 return ieee80211_clean_skb(origskb, present_fcs_len,
835 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
837 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
838 bool last_monitor = list_is_last(&sdata->u.mntr.list,
842 monskb = ieee80211_make_monitor_skb(local, &origskb,
854 skb = skb_clone(monskb, GFP_ATOMIC);
858 skb->dev = sdata->dev;
859 dev_sw_netstats_rx_add(skb->dev, skb->len);
860 netif_receive_skb(skb);
868 /* this happens if last_monitor was erroneously false */
869 dev_kfree_skb(monskb);
875 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
878 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
880 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
881 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
882 int tid, seqno_idx, security_idx;
884 /* does the frame have a qos control field? */
885 if (ieee80211_is_data_qos(hdr->frame_control)) {
886 u8 *qc = ieee80211_get_qos_ctl(hdr);
887 /* frame has qos control */
888 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
889 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
890 status->rx_flags |= IEEE80211_RX_AMSDU;
896 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
898 * Sequence numbers for management frames, QoS data
899 * frames with a broadcast/multicast address in the
900 * Address 1 field, and all non-QoS data frames sent
901 * by QoS STAs are assigned using an additional single
902 * modulo-4096 counter, [...]
904 * We also use that counter for non-QoS STAs.
906 seqno_idx = IEEE80211_NUM_TIDS;
908 if (ieee80211_is_mgmt(hdr->frame_control))
909 security_idx = IEEE80211_NUM_TIDS;
913 rx->seqno_idx = seqno_idx;
914 rx->security_idx = security_idx;
915 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
916 * For now, set skb->priority to 0 for other cases. */
917 rx->skb->priority = (tid > 7) ? 0 : tid;
921 * DOC: Packet alignment
923 * Drivers always need to pass packets that are aligned to two-byte boundaries
926 * Additionally, should, if possible, align the payload data in a way that
927 * guarantees that the contained IP header is aligned to a four-byte
928 * boundary. In the case of regular frames, this simply means aligning the
929 * payload to a four-byte boundary (because either the IP header is directly
930 * contained, or IV/RFC1042 headers that have a length divisible by four are
931 * in front of it). If the payload data is not properly aligned and the
932 * architecture doesn't support efficient unaligned operations, mac80211
933 * will align the data.
935 * With A-MSDU frames, however, the payload data address must yield two modulo
936 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
937 * push the IP header further back to a multiple of four again. Thankfully, the
938 * specs were sane enough this time around to require padding each A-MSDU
939 * subframe to a length that is a multiple of four.
941 * Padding like Atheros hardware adds which is between the 802.11 header and
942 * the payload is not supported, the driver is required to move the 802.11
943 * header to be directly in front of the payload in that case.
945 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
947 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
948 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
955 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
957 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
959 if (is_multicast_ether_addr(hdr->addr1))
962 return ieee80211_is_robust_mgmt_frame(skb);
966 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
968 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
970 if (!is_multicast_ether_addr(hdr->addr1))
973 return ieee80211_is_robust_mgmt_frame(skb);
977 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
978 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
980 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
981 struct ieee80211_mmie *mmie;
982 struct ieee80211_mmie_16 *mmie16;
984 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
987 if (!ieee80211_is_robust_mgmt_frame(skb) &&
988 !ieee80211_is_beacon(hdr->frame_control))
989 return -1; /* not a robust management frame */
991 mmie = (struct ieee80211_mmie *)
992 (skb->data + skb->len - sizeof(*mmie));
993 if (mmie->element_id == WLAN_EID_MMIE &&
994 mmie->length == sizeof(*mmie) - 2)
995 return le16_to_cpu(mmie->key_id);
997 mmie16 = (struct ieee80211_mmie_16 *)
998 (skb->data + skb->len - sizeof(*mmie16));
999 if (skb->len >= 24 + sizeof(*mmie16) &&
1000 mmie16->element_id == WLAN_EID_MMIE &&
1001 mmie16->length == sizeof(*mmie16) - 2)
1002 return le16_to_cpu(mmie16->key_id);
1007 static int ieee80211_get_keyid(struct sk_buff *skb,
1008 const struct ieee80211_cipher_scheme *cs)
1010 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1018 fc = hdr->frame_control;
1019 hdrlen = ieee80211_hdrlen(fc);
1022 minlen = hdrlen + cs->hdr_len;
1023 key_idx_off = hdrlen + cs->key_idx_off;
1024 key_idx_shift = cs->key_idx_shift;
1026 /* WEP, TKIP, CCMP and GCMP */
1027 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1028 key_idx_off = hdrlen + 3;
1032 if (unlikely(skb->len < minlen))
1035 skb_copy_bits(skb, key_idx_off, &keyid, 1);
1038 keyid &= cs->key_idx_mask;
1039 keyid >>= key_idx_shift;
1041 /* cs could use more than the usual two bits for the keyid */
1042 if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1048 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1050 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1051 char *dev_addr = rx->sdata->vif.addr;
1053 if (ieee80211_is_data(hdr->frame_control)) {
1054 if (is_multicast_ether_addr(hdr->addr1)) {
1055 if (ieee80211_has_tods(hdr->frame_control) ||
1056 !ieee80211_has_fromds(hdr->frame_control))
1057 return RX_DROP_MONITOR;
1058 if (ether_addr_equal(hdr->addr3, dev_addr))
1059 return RX_DROP_MONITOR;
1061 if (!ieee80211_has_a4(hdr->frame_control))
1062 return RX_DROP_MONITOR;
1063 if (ether_addr_equal(hdr->addr4, dev_addr))
1064 return RX_DROP_MONITOR;
1068 /* If there is not an established peer link and this is not a peer link
1069 * establisment frame, beacon or probe, drop the frame.
1072 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1073 struct ieee80211_mgmt *mgmt;
1075 if (!ieee80211_is_mgmt(hdr->frame_control))
1076 return RX_DROP_MONITOR;
1078 if (ieee80211_is_action(hdr->frame_control)) {
1081 /* make sure category field is present */
1082 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1083 return RX_DROP_MONITOR;
1085 mgmt = (struct ieee80211_mgmt *)hdr;
1086 category = mgmt->u.action.category;
1087 if (category != WLAN_CATEGORY_MESH_ACTION &&
1088 category != WLAN_CATEGORY_SELF_PROTECTED)
1089 return RX_DROP_MONITOR;
1093 if (ieee80211_is_probe_req(hdr->frame_control) ||
1094 ieee80211_is_probe_resp(hdr->frame_control) ||
1095 ieee80211_is_beacon(hdr->frame_control) ||
1096 ieee80211_is_auth(hdr->frame_control))
1099 return RX_DROP_MONITOR;
1105 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1108 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1109 struct sk_buff *tail = skb_peek_tail(frames);
1110 struct ieee80211_rx_status *status;
1112 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1118 status = IEEE80211_SKB_RXCB(tail);
1119 if (status->flag & RX_FLAG_AMSDU_MORE)
1125 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1126 struct tid_ampdu_rx *tid_agg_rx,
1128 struct sk_buff_head *frames)
1130 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1131 struct sk_buff *skb;
1132 struct ieee80211_rx_status *status;
1134 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1136 if (skb_queue_empty(skb_list))
1139 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1140 __skb_queue_purge(skb_list);
1144 /* release frames from the reorder ring buffer */
1145 tid_agg_rx->stored_mpdu_num--;
1146 while ((skb = __skb_dequeue(skb_list))) {
1147 status = IEEE80211_SKB_RXCB(skb);
1148 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1149 __skb_queue_tail(frames, skb);
1153 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1154 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1157 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1158 struct tid_ampdu_rx *tid_agg_rx,
1160 struct sk_buff_head *frames)
1164 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1166 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1167 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1168 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1174 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1175 * the skb was added to the buffer longer than this time ago, the earlier
1176 * frames that have not yet been received are assumed to be lost and the skb
1177 * can be released for processing. This may also release other skb's from the
1178 * reorder buffer if there are no additional gaps between the frames.
1180 * Callers must hold tid_agg_rx->reorder_lock.
1182 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1184 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1185 struct tid_ampdu_rx *tid_agg_rx,
1186 struct sk_buff_head *frames)
1190 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1192 /* release the buffer until next missing frame */
1193 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1194 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1195 tid_agg_rx->stored_mpdu_num) {
1197 * No buffers ready to be released, but check whether any
1198 * frames in the reorder buffer have timed out.
1201 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1202 j = (j + 1) % tid_agg_rx->buf_size) {
1203 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1208 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1209 HT_RX_REORDER_BUF_TIMEOUT))
1210 goto set_release_timer;
1212 /* don't leave incomplete A-MSDUs around */
1213 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1214 i = (i + 1) % tid_agg_rx->buf_size)
1215 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1217 ht_dbg_ratelimited(sdata,
1218 "release an RX reorder frame due to timeout on earlier frames\n");
1219 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1223 * Increment the head seq# also for the skipped slots.
1225 tid_agg_rx->head_seq_num =
1226 (tid_agg_rx->head_seq_num +
1227 skipped) & IEEE80211_SN_MASK;
1230 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1231 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1233 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1236 if (tid_agg_rx->stored_mpdu_num) {
1237 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1239 for (; j != (index - 1) % tid_agg_rx->buf_size;
1240 j = (j + 1) % tid_agg_rx->buf_size) {
1241 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1247 if (!tid_agg_rx->removed)
1248 mod_timer(&tid_agg_rx->reorder_timer,
1249 tid_agg_rx->reorder_time[j] + 1 +
1250 HT_RX_REORDER_BUF_TIMEOUT);
1252 del_timer(&tid_agg_rx->reorder_timer);
1257 * As this function belongs to the RX path it must be under
1258 * rcu_read_lock protection. It returns false if the frame
1259 * can be processed immediately, true if it was consumed.
1261 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1262 struct tid_ampdu_rx *tid_agg_rx,
1263 struct sk_buff *skb,
1264 struct sk_buff_head *frames)
1266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1267 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1268 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1269 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1270 u16 head_seq_num, buf_size;
1274 spin_lock(&tid_agg_rx->reorder_lock);
1277 * Offloaded BA sessions have no known starting sequence number so pick
1278 * one from first Rxed frame for this tid after BA was started.
1280 if (unlikely(tid_agg_rx->auto_seq)) {
1281 tid_agg_rx->auto_seq = false;
1282 tid_agg_rx->ssn = mpdu_seq_num;
1283 tid_agg_rx->head_seq_num = mpdu_seq_num;
1286 buf_size = tid_agg_rx->buf_size;
1287 head_seq_num = tid_agg_rx->head_seq_num;
1290 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1293 if (unlikely(!tid_agg_rx->started)) {
1294 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1298 tid_agg_rx->started = true;
1301 /* frame with out of date sequence number */
1302 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1308 * If frame the sequence number exceeds our buffering window
1309 * size release some previous frames to make room for this one.
1311 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1312 head_seq_num = ieee80211_sn_inc(
1313 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1314 /* release stored frames up to new head to stack */
1315 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1316 head_seq_num, frames);
1319 /* Now the new frame is always in the range of the reordering buffer */
1321 index = mpdu_seq_num % tid_agg_rx->buf_size;
1323 /* check if we already stored this frame */
1324 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1330 * If the current MPDU is in the right order and nothing else
1331 * is stored we can process it directly, no need to buffer it.
1332 * If it is first but there's something stored, we may be able
1333 * to release frames after this one.
1335 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1336 tid_agg_rx->stored_mpdu_num == 0) {
1337 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1338 tid_agg_rx->head_seq_num =
1339 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1344 /* put the frame in the reordering buffer */
1345 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1346 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1347 tid_agg_rx->reorder_time[index] = jiffies;
1348 tid_agg_rx->stored_mpdu_num++;
1349 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1353 spin_unlock(&tid_agg_rx->reorder_lock);
1358 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1359 * true if the MPDU was buffered, false if it should be processed.
1361 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1362 struct sk_buff_head *frames)
1364 struct sk_buff *skb = rx->skb;
1365 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1366 struct sta_info *sta = rx->sta;
1367 struct tid_ampdu_rx *tid_agg_rx;
1371 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1372 is_multicast_ether_addr(hdr->addr1))
1376 * filter the QoS data rx stream according to
1377 * STA/TID and check if this STA/TID is on aggregation
1383 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1384 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1385 tid = ieee80211_get_tid(hdr);
1387 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1389 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1390 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1391 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1392 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1393 WLAN_BACK_RECIPIENT,
1394 WLAN_REASON_QSTA_REQUIRE_SETUP);
1398 /* qos null data frames are excluded */
1399 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1402 /* not part of a BA session */
1403 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1404 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1407 /* new, potentially un-ordered, ampdu frame - process it */
1409 /* reset session timer */
1410 if (tid_agg_rx->timeout)
1411 tid_agg_rx->last_rx = jiffies;
1413 /* if this mpdu is fragmented - terminate rx aggregation session */
1414 sc = le16_to_cpu(hdr->seq_ctrl);
1415 if (sc & IEEE80211_SCTL_FRAG) {
1416 ieee80211_queue_skb_to_iface(rx->sdata, NULL, skb);
1421 * No locking needed -- we will only ever process one
1422 * RX packet at a time, and thus own tid_agg_rx. All
1423 * other code manipulating it needs to (and does) make
1424 * sure that we cannot get to it any more before doing
1427 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1432 __skb_queue_tail(frames, skb);
1435 static ieee80211_rx_result debug_noinline
1436 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1438 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1439 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1441 if (status->flag & RX_FLAG_DUP_VALIDATED)
1445 * Drop duplicate 802.11 retransmissions
1446 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1449 if (rx->skb->len < 24)
1452 if (ieee80211_is_ctl(hdr->frame_control) ||
1453 ieee80211_is_any_nullfunc(hdr->frame_control) ||
1454 is_multicast_ether_addr(hdr->addr1))
1460 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1461 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1462 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1463 rx->sta->rx_stats.num_duplicates++;
1464 return RX_DROP_UNUSABLE;
1465 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1466 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1472 static ieee80211_rx_result debug_noinline
1473 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1477 /* Drop disallowed frame classes based on STA auth/assoc state;
1478 * IEEE 802.11, Chap 5.5.
1480 * mac80211 filters only based on association state, i.e. it drops
1481 * Class 3 frames from not associated stations. hostapd sends
1482 * deauth/disassoc frames when needed. In addition, hostapd is
1483 * responsible for filtering on both auth and assoc states.
1486 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1487 return ieee80211_rx_mesh_check(rx);
1489 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1490 ieee80211_is_pspoll(hdr->frame_control)) &&
1491 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1492 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1493 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1495 * accept port control frames from the AP even when it's not
1496 * yet marked ASSOC to prevent a race where we don't set the
1497 * assoc bit quickly enough before it sends the first frame
1499 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1500 ieee80211_is_data_present(hdr->frame_control)) {
1501 unsigned int hdrlen;
1504 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1506 if (rx->skb->len < hdrlen + 8)
1507 return RX_DROP_MONITOR;
1509 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1510 if (ethertype == rx->sdata->control_port_protocol)
1514 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1515 cfg80211_rx_spurious_frame(rx->sdata->dev,
1518 return RX_DROP_UNUSABLE;
1520 return RX_DROP_MONITOR;
1527 static ieee80211_rx_result debug_noinline
1528 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1530 struct ieee80211_local *local;
1531 struct ieee80211_hdr *hdr;
1532 struct sk_buff *skb;
1536 hdr = (struct ieee80211_hdr *) skb->data;
1538 if (!local->pspolling)
1541 if (!ieee80211_has_fromds(hdr->frame_control))
1542 /* this is not from AP */
1545 if (!ieee80211_is_data(hdr->frame_control))
1548 if (!ieee80211_has_moredata(hdr->frame_control)) {
1549 /* AP has no more frames buffered for us */
1550 local->pspolling = false;
1554 /* more data bit is set, let's request a new frame from the AP */
1555 ieee80211_send_pspoll(local, rx->sdata);
1560 static void sta_ps_start(struct sta_info *sta)
1562 struct ieee80211_sub_if_data *sdata = sta->sdata;
1563 struct ieee80211_local *local = sdata->local;
1567 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1568 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1569 ps = &sdata->bss->ps;
1573 atomic_inc(&ps->num_sta_ps);
1574 set_sta_flag(sta, WLAN_STA_PS_STA);
1575 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1576 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1577 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1578 sta->sta.addr, sta->sta.aid);
1580 ieee80211_clear_fast_xmit(sta);
1582 if (!sta->sta.txq[0])
1585 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1586 struct ieee80211_txq *txq = sta->sta.txq[tid];
1588 ieee80211_unschedule_txq(&local->hw, txq, false);
1590 if (txq_has_queue(txq))
1591 set_bit(tid, &sta->txq_buffered_tids);
1593 clear_bit(tid, &sta->txq_buffered_tids);
1597 static void sta_ps_end(struct sta_info *sta)
1599 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1600 sta->sta.addr, sta->sta.aid);
1602 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1604 * Clear the flag only if the other one is still set
1605 * so that the TX path won't start TX'ing new frames
1606 * directly ... In the case that the driver flag isn't
1607 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1609 clear_sta_flag(sta, WLAN_STA_PS_STA);
1610 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1611 sta->sta.addr, sta->sta.aid);
1615 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1616 clear_sta_flag(sta, WLAN_STA_PS_STA);
1617 ieee80211_sta_ps_deliver_wakeup(sta);
1620 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1622 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1625 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1627 /* Don't let the same PS state be set twice */
1628 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1629 if ((start && in_ps) || (!start && !in_ps))
1639 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1641 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1643 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1645 if (test_sta_flag(sta, WLAN_STA_SP))
1648 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1649 ieee80211_sta_ps_deliver_poll_response(sta);
1651 set_sta_flag(sta, WLAN_STA_PSPOLL);
1653 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1655 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1657 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1658 int ac = ieee80211_ac_from_tid(tid);
1661 * If this AC is not trigger-enabled do nothing unless the
1662 * driver is calling us after it already checked.
1664 * NB: This could/should check a separate bitmap of trigger-
1665 * enabled queues, but for now we only implement uAPSD w/o
1666 * TSPEC changes to the ACs, so they're always the same.
1668 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1669 tid != IEEE80211_NUM_TIDS)
1672 /* if we are in a service period, do nothing */
1673 if (test_sta_flag(sta, WLAN_STA_SP))
1676 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1677 ieee80211_sta_ps_deliver_uapsd(sta);
1679 set_sta_flag(sta, WLAN_STA_UAPSD);
1681 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1683 static ieee80211_rx_result debug_noinline
1684 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1686 struct ieee80211_sub_if_data *sdata = rx->sdata;
1687 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1688 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1693 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1694 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1698 * The device handles station powersave, so don't do anything about
1699 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1700 * it to mac80211 since they're handled.)
1702 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1706 * Don't do anything if the station isn't already asleep. In
1707 * the uAPSD case, the station will probably be marked asleep,
1708 * in the PS-Poll case the station must be confused ...
1710 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1713 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1714 ieee80211_sta_pspoll(&rx->sta->sta);
1716 /* Free PS Poll skb here instead of returning RX_DROP that would
1717 * count as an dropped frame. */
1718 dev_kfree_skb(rx->skb);
1721 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1722 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1723 ieee80211_has_pm(hdr->frame_control) &&
1724 (ieee80211_is_data_qos(hdr->frame_control) ||
1725 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1726 u8 tid = ieee80211_get_tid(hdr);
1728 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1734 static ieee80211_rx_result debug_noinline
1735 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1737 struct sta_info *sta = rx->sta;
1738 struct sk_buff *skb = rx->skb;
1739 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1740 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1747 * Update last_rx only for IBSS packets which are for the current
1748 * BSSID and for station already AUTHORIZED to avoid keeping the
1749 * current IBSS network alive in cases where other STAs start
1750 * using different BSSID. This will also give the station another
1751 * chance to restart the authentication/authorization in case
1752 * something went wrong the first time.
1754 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1755 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1756 NL80211_IFTYPE_ADHOC);
1757 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1758 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1759 sta->rx_stats.last_rx = jiffies;
1760 if (ieee80211_is_data(hdr->frame_control) &&
1761 !is_multicast_ether_addr(hdr->addr1))
1762 sta->rx_stats.last_rate =
1763 sta_stats_encode_rate(status);
1765 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1766 sta->rx_stats.last_rx = jiffies;
1767 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1768 !is_multicast_ether_addr(hdr->addr1)) {
1770 * Mesh beacons will update last_rx when if they are found to
1771 * match the current local configuration when processed.
1773 sta->rx_stats.last_rx = jiffies;
1774 if (ieee80211_is_data(hdr->frame_control))
1775 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1778 sta->rx_stats.fragments++;
1780 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1781 sta->rx_stats.bytes += rx->skb->len;
1782 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1784 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1785 sta->rx_stats.last_signal = status->signal;
1786 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1789 if (status->chains) {
1790 sta->rx_stats.chains = status->chains;
1791 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1792 int signal = status->chain_signal[i];
1794 if (!(status->chains & BIT(i)))
1797 sta->rx_stats.chain_signal_last[i] = signal;
1798 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1803 if (ieee80211_is_s1g_beacon(hdr->frame_control))
1807 * Change STA power saving mode only at the end of a frame
1808 * exchange sequence, and only for a data or management
1809 * frame as specified in IEEE 802.11-2016 11.2.3.2
1811 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1812 !ieee80211_has_morefrags(hdr->frame_control) &&
1813 !is_multicast_ether_addr(hdr->addr1) &&
1814 (ieee80211_is_mgmt(hdr->frame_control) ||
1815 ieee80211_is_data(hdr->frame_control)) &&
1816 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1817 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1818 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1819 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1820 if (!ieee80211_has_pm(hdr->frame_control))
1823 if (ieee80211_has_pm(hdr->frame_control))
1828 /* mesh power save support */
1829 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1830 ieee80211_mps_rx_h_sta_process(sta, hdr);
1833 * Drop (qos-)data::nullfunc frames silently, since they
1834 * are used only to control station power saving mode.
1836 if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1837 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1840 * If we receive a 4-addr nullfunc frame from a STA
1841 * that was not moved to a 4-addr STA vlan yet send
1842 * the event to userspace and for older hostapd drop
1843 * the frame to the monitor interface.
1845 if (ieee80211_has_a4(hdr->frame_control) &&
1846 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1847 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1848 !rx->sdata->u.vlan.sta))) {
1849 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1850 cfg80211_rx_unexpected_4addr_frame(
1851 rx->sdata->dev, sta->sta.addr,
1853 return RX_DROP_MONITOR;
1856 * Update counter and free packet here to avoid
1857 * counting this as a dropped packed.
1859 sta->rx_stats.packets++;
1860 dev_kfree_skb(rx->skb);
1865 } /* ieee80211_rx_h_sta_process */
1867 static struct ieee80211_key *
1868 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1870 struct ieee80211_key *key = NULL;
1871 struct ieee80211_sub_if_data *sdata = rx->sdata;
1874 /* Make sure key gets set if either BIGTK key index is set so that
1875 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1876 * Beacon frames and Beacon frames that claim to use another BIGTK key
1877 * index (i.e., a key that we do not have).
1881 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1884 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1891 key = rcu_dereference(rx->sta->gtk[idx]);
1893 key = rcu_dereference(sdata->keys[idx]);
1894 if (!key && rx->sta)
1895 key = rcu_dereference(rx->sta->gtk[idx2]);
1897 key = rcu_dereference(sdata->keys[idx2]);
1902 static ieee80211_rx_result debug_noinline
1903 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1905 struct sk_buff *skb = rx->skb;
1906 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1907 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1909 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1910 struct ieee80211_key *sta_ptk = NULL;
1911 struct ieee80211_key *ptk_idx = NULL;
1912 int mmie_keyidx = -1;
1914 const struct ieee80211_cipher_scheme *cs = NULL;
1916 if (ieee80211_is_ext(hdr->frame_control))
1922 * There are five types of keys:
1923 * - GTK (group keys)
1924 * - IGTK (group keys for management frames)
1925 * - BIGTK (group keys for Beacon frames)
1926 * - PTK (pairwise keys)
1927 * - STK (station-to-station pairwise keys)
1929 * When selecting a key, we have to distinguish between multicast
1930 * (including broadcast) and unicast frames, the latter can only
1931 * use PTKs and STKs while the former always use GTKs, IGTKs, and
1932 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1933 * then unicast frames can also use key indices like GTKs. Hence, if we
1934 * don't have a PTK/STK we check the key index for a WEP key.
1936 * Note that in a regular BSS, multicast frames are sent by the
1937 * AP only, associated stations unicast the frame to the AP first
1938 * which then multicasts it on their behalf.
1940 * There is also a slight problem in IBSS mode: GTKs are negotiated
1941 * with each station, that is something we don't currently handle.
1942 * The spec seems to expect that one negotiates the same key with
1943 * every station but there's no such requirement; VLANs could be
1947 /* start without a key */
1949 fc = hdr->frame_control;
1952 int keyid = rx->sta->ptk_idx;
1953 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1955 if (ieee80211_has_protected(fc)) {
1956 cs = rx->sta->cipher_scheme;
1957 keyid = ieee80211_get_keyid(rx->skb, cs);
1959 if (unlikely(keyid < 0))
1960 return RX_DROP_UNUSABLE;
1962 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1966 if (!ieee80211_has_protected(fc))
1967 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1969 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1970 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1971 if ((status->flag & RX_FLAG_DECRYPTED) &&
1972 (status->flag & RX_FLAG_IV_STRIPPED))
1974 /* Skip decryption if the frame is not protected. */
1975 if (!ieee80211_has_protected(fc))
1977 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1978 /* Broadcast/multicast robust management frame / BIP */
1979 if ((status->flag & RX_FLAG_DECRYPTED) &&
1980 (status->flag & RX_FLAG_IV_STRIPPED))
1983 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1984 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1985 NUM_DEFAULT_BEACON_KEYS) {
1986 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1989 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1992 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1994 return RX_CONTINUE; /* Beacon protection not in use */
1995 } else if (mmie_keyidx >= 0) {
1996 /* Broadcast/multicast robust management frame / BIP */
1997 if ((status->flag & RX_FLAG_DECRYPTED) &&
1998 (status->flag & RX_FLAG_IV_STRIPPED))
2001 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2002 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2003 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
2005 if (ieee80211_is_group_privacy_action(skb) &&
2006 test_sta_flag(rx->sta, WLAN_STA_MFP))
2007 return RX_DROP_MONITOR;
2009 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
2012 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
2013 } else if (!ieee80211_has_protected(fc)) {
2015 * The frame was not protected, so skip decryption. However, we
2016 * need to set rx->key if there is a key that could have been
2017 * used so that the frame may be dropped if encryption would
2018 * have been expected.
2020 struct ieee80211_key *key = NULL;
2021 struct ieee80211_sub_if_data *sdata = rx->sdata;
2024 if (ieee80211_is_beacon(fc)) {
2025 key = ieee80211_rx_get_bigtk(rx, -1);
2026 } else if (ieee80211_is_mgmt(fc) &&
2027 is_multicast_ether_addr(hdr->addr1)) {
2028 key = rcu_dereference(rx->sdata->default_mgmt_key);
2031 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2032 key = rcu_dereference(rx->sta->gtk[i]);
2038 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2039 key = rcu_dereference(sdata->keys[i]);
2050 * The device doesn't give us the IV so we won't be
2051 * able to look up the key. That's ok though, we
2052 * don't need to decrypt the frame, we just won't
2053 * be able to keep statistics accurate.
2054 * Except for key threshold notifications, should
2055 * we somehow allow the driver to tell us which key
2056 * the hardware used if this flag is set?
2058 if ((status->flag & RX_FLAG_DECRYPTED) &&
2059 (status->flag & RX_FLAG_IV_STRIPPED))
2062 keyidx = ieee80211_get_keyid(rx->skb, cs);
2064 if (unlikely(keyidx < 0))
2065 return RX_DROP_UNUSABLE;
2067 /* check per-station GTK first, if multicast packet */
2068 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2069 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2071 /* if not found, try default key */
2073 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2076 * RSNA-protected unicast frames should always be
2077 * sent with pairwise or station-to-station keys,
2078 * but for WEP we allow using a key index as well.
2081 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2082 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2083 !is_multicast_ether_addr(hdr->addr1))
2089 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2090 return RX_DROP_MONITOR;
2092 /* TODO: add threshold stuff again */
2094 return RX_DROP_MONITOR;
2097 switch (rx->key->conf.cipher) {
2098 case WLAN_CIPHER_SUITE_WEP40:
2099 case WLAN_CIPHER_SUITE_WEP104:
2100 result = ieee80211_crypto_wep_decrypt(rx);
2102 case WLAN_CIPHER_SUITE_TKIP:
2103 result = ieee80211_crypto_tkip_decrypt(rx);
2105 case WLAN_CIPHER_SUITE_CCMP:
2106 result = ieee80211_crypto_ccmp_decrypt(
2107 rx, IEEE80211_CCMP_MIC_LEN);
2109 case WLAN_CIPHER_SUITE_CCMP_256:
2110 result = ieee80211_crypto_ccmp_decrypt(
2111 rx, IEEE80211_CCMP_256_MIC_LEN);
2113 case WLAN_CIPHER_SUITE_AES_CMAC:
2114 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2116 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2117 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2119 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2120 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2121 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2123 case WLAN_CIPHER_SUITE_GCMP:
2124 case WLAN_CIPHER_SUITE_GCMP_256:
2125 result = ieee80211_crypto_gcmp_decrypt(rx);
2128 result = ieee80211_crypto_hw_decrypt(rx);
2131 /* the hdr variable is invalid after the decrypt handlers */
2133 /* either the frame has been decrypted or will be dropped */
2134 status->flag |= RX_FLAG_DECRYPTED;
2136 if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
2137 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2138 skb->data, skb->len);
2143 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2147 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2148 skb_queue_head_init(&cache->entries[i].skb_list);
2151 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2155 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2156 __skb_queue_purge(&cache->entries[i].skb_list);
2159 static inline struct ieee80211_fragment_entry *
2160 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2161 unsigned int frag, unsigned int seq, int rx_queue,
2162 struct sk_buff **skb)
2164 struct ieee80211_fragment_entry *entry;
2166 entry = &cache->entries[cache->next++];
2167 if (cache->next >= IEEE80211_FRAGMENT_MAX)
2170 __skb_queue_purge(&entry->skb_list);
2172 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2174 entry->first_frag_time = jiffies;
2176 entry->rx_queue = rx_queue;
2177 entry->last_frag = frag;
2178 entry->check_sequential_pn = false;
2179 entry->extra_len = 0;
2184 static inline struct ieee80211_fragment_entry *
2185 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2186 unsigned int frag, unsigned int seq,
2187 int rx_queue, struct ieee80211_hdr *hdr)
2189 struct ieee80211_fragment_entry *entry;
2193 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2194 struct ieee80211_hdr *f_hdr;
2195 struct sk_buff *f_skb;
2199 idx = IEEE80211_FRAGMENT_MAX - 1;
2201 entry = &cache->entries[idx];
2202 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2203 entry->rx_queue != rx_queue ||
2204 entry->last_frag + 1 != frag)
2207 f_skb = __skb_peek(&entry->skb_list);
2208 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2211 * Check ftype and addresses are equal, else check next fragment
2213 if (((hdr->frame_control ^ f_hdr->frame_control) &
2214 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2215 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2216 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2219 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2220 __skb_queue_purge(&entry->skb_list);
2229 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2232 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2233 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2234 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2235 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2236 ieee80211_has_protected(fc);
2239 static ieee80211_rx_result debug_noinline
2240 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2242 struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2243 struct ieee80211_hdr *hdr;
2246 unsigned int frag, seq;
2247 struct ieee80211_fragment_entry *entry;
2248 struct sk_buff *skb;
2249 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2251 hdr = (struct ieee80211_hdr *)rx->skb->data;
2252 fc = hdr->frame_control;
2254 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2257 sc = le16_to_cpu(hdr->seq_ctrl);
2258 frag = sc & IEEE80211_SCTL_FRAG;
2261 cache = &rx->sta->frags;
2263 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2266 if (is_multicast_ether_addr(hdr->addr1))
2267 return RX_DROP_MONITOR;
2269 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2271 if (skb_linearize(rx->skb))
2272 return RX_DROP_UNUSABLE;
2275 * skb_linearize() might change the skb->data and
2276 * previously cached variables (in this case, hdr) need to
2277 * be refreshed with the new data.
2279 hdr = (struct ieee80211_hdr *)rx->skb->data;
2280 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2283 /* This is the first fragment of a new frame. */
2284 entry = ieee80211_reassemble_add(cache, frag, seq,
2285 rx->seqno_idx, &(rx->skb));
2286 if (requires_sequential_pn(rx, fc)) {
2287 int queue = rx->security_idx;
2289 /* Store CCMP/GCMP PN so that we can verify that the
2290 * next fragment has a sequential PN value.
2292 entry->check_sequential_pn = true;
2293 entry->is_protected = true;
2294 entry->key_color = rx->key->color;
2295 memcpy(entry->last_pn,
2296 rx->key->u.ccmp.rx_pn[queue],
2297 IEEE80211_CCMP_PN_LEN);
2298 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2300 offsetof(struct ieee80211_key,
2302 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2303 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2304 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2305 IEEE80211_GCMP_PN_LEN);
2306 } else if (rx->key &&
2307 (ieee80211_has_protected(fc) ||
2308 (status->flag & RX_FLAG_DECRYPTED))) {
2309 entry->is_protected = true;
2310 entry->key_color = rx->key->color;
2315 /* This is a fragment for a frame that should already be pending in
2316 * fragment cache. Add this fragment to the end of the pending entry.
2318 entry = ieee80211_reassemble_find(cache, frag, seq,
2319 rx->seqno_idx, hdr);
2321 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2322 return RX_DROP_MONITOR;
2325 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2326 * MPDU PN values are not incrementing in steps of 1."
2327 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2328 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2330 if (entry->check_sequential_pn) {
2332 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2334 if (!requires_sequential_pn(rx, fc))
2335 return RX_DROP_UNUSABLE;
2337 /* Prevent mixed key and fragment cache attacks */
2338 if (entry->key_color != rx->key->color)
2339 return RX_DROP_UNUSABLE;
2341 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2342 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2348 rpn = rx->ccm_gcm.pn;
2349 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2350 return RX_DROP_UNUSABLE;
2351 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2352 } else if (entry->is_protected &&
2354 (!ieee80211_has_protected(fc) &&
2355 !(status->flag & RX_FLAG_DECRYPTED)) ||
2356 rx->key->color != entry->key_color)) {
2357 /* Drop this as a mixed key or fragment cache attack, even
2358 * if for TKIP Michael MIC should protect us, and WEP is a
2359 * lost cause anyway.
2361 return RX_DROP_UNUSABLE;
2362 } else if (entry->is_protected && rx->key &&
2363 entry->key_color != rx->key->color &&
2364 (status->flag & RX_FLAG_DECRYPTED)) {
2365 return RX_DROP_UNUSABLE;
2368 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2369 __skb_queue_tail(&entry->skb_list, rx->skb);
2370 entry->last_frag = frag;
2371 entry->extra_len += rx->skb->len;
2372 if (ieee80211_has_morefrags(fc)) {
2377 rx->skb = __skb_dequeue(&entry->skb_list);
2378 if (skb_tailroom(rx->skb) < entry->extra_len) {
2379 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2380 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2382 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2383 __skb_queue_purge(&entry->skb_list);
2384 return RX_DROP_UNUSABLE;
2387 while ((skb = __skb_dequeue(&entry->skb_list))) {
2388 skb_put_data(rx->skb, skb->data, skb->len);
2393 ieee80211_led_rx(rx->local);
2395 rx->sta->rx_stats.packets++;
2399 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2401 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2407 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2409 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2410 struct sk_buff *skb = rx->skb;
2411 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2414 * Pass through unencrypted frames if the hardware has
2415 * decrypted them already.
2417 if (status->flag & RX_FLAG_DECRYPTED)
2420 /* check mesh EAPOL frames first */
2421 if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2422 ieee80211_is_data(fc))) {
2423 struct ieee80211s_hdr *mesh_hdr;
2424 u16 hdr_len = ieee80211_hdrlen(fc);
2425 u16 ethertype_offset;
2428 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2431 /* make sure fixed part of mesh header is there, also checks skb len */
2432 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2435 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2436 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2437 sizeof(rfc1042_header);
2439 if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 &&
2440 ethertype == rx->sdata->control_port_protocol)
2445 /* Drop unencrypted frames if key is set. */
2446 if (unlikely(!ieee80211_has_protected(fc) &&
2447 !ieee80211_is_any_nullfunc(fc) &&
2448 ieee80211_is_data(fc) && rx->key))
2454 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2456 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2457 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2458 __le16 fc = hdr->frame_control;
2461 * Pass through unencrypted frames if the hardware has
2462 * decrypted them already.
2464 if (status->flag & RX_FLAG_DECRYPTED)
2467 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2468 if (unlikely(!ieee80211_has_protected(fc) &&
2469 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2471 if (ieee80211_is_deauth(fc) ||
2472 ieee80211_is_disassoc(fc))
2473 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2478 /* BIP does not use Protected field, so need to check MMIE */
2479 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2480 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2481 if (ieee80211_is_deauth(fc) ||
2482 ieee80211_is_disassoc(fc))
2483 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2488 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2489 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2490 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2496 * When using MFP, Action frames are not allowed prior to
2497 * having configured keys.
2499 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2500 ieee80211_is_robust_mgmt_frame(rx->skb)))
2508 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2510 struct ieee80211_sub_if_data *sdata = rx->sdata;
2511 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2512 bool check_port_control = false;
2513 struct ethhdr *ehdr;
2516 *port_control = false;
2517 if (ieee80211_has_a4(hdr->frame_control) &&
2518 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2521 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2522 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2524 if (!sdata->u.mgd.use_4addr)
2526 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2527 check_port_control = true;
2530 if (is_multicast_ether_addr(hdr->addr1) &&
2531 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2534 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2538 ehdr = (struct ethhdr *) rx->skb->data;
2539 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2540 *port_control = true;
2541 else if (check_port_control)
2548 * requires that rx->skb is a frame with ethernet header
2550 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2552 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2553 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2554 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2557 * Allow EAPOL frames to us/the PAE group address regardless of
2558 * whether the frame was encrypted or not, and always disallow
2559 * all other destination addresses for them.
2561 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2562 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2563 ether_addr_equal(ehdr->h_dest, pae_group_addr);
2565 if (ieee80211_802_1x_port_control(rx) ||
2566 ieee80211_drop_unencrypted(rx, fc))
2572 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2573 struct ieee80211_rx_data *rx)
2575 struct ieee80211_sub_if_data *sdata = rx->sdata;
2576 struct net_device *dev = sdata->dev;
2578 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2579 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2580 !sdata->control_port_no_preauth)) &&
2581 sdata->control_port_over_nl80211)) {
2582 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2583 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2585 cfg80211_rx_control_port(dev, skb, noencrypt);
2588 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2590 memset(skb->cb, 0, sizeof(skb->cb));
2593 * 802.1X over 802.11 requires that the authenticator address
2594 * be used for EAPOL frames. However, 802.1X allows the use of
2595 * the PAE group address instead. If the interface is part of
2596 * a bridge and we pass the frame with the PAE group address,
2597 * then the bridge will forward it to the network (even if the
2598 * client was not associated yet), which isn't supposed to
2600 * To avoid that, rewrite the destination address to our own
2601 * address, so that the authenticator (e.g. hostapd) will see
2602 * the frame, but bridge won't forward it anywhere else. Note
2603 * that due to earlier filtering, the only other address can
2604 * be the PAE group address.
2606 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2607 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2608 ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2610 /* deliver to local stack */
2612 list_add_tail(&skb->list, rx->list);
2614 netif_receive_skb(skb);
2619 * requires that rx->skb is a frame with ethernet header
2622 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2624 struct ieee80211_sub_if_data *sdata = rx->sdata;
2625 struct net_device *dev = sdata->dev;
2626 struct sk_buff *skb, *xmit_skb;
2627 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2628 struct sta_info *dsta;
2633 dev_sw_netstats_rx_add(dev, skb->len);
2636 /* The seqno index has the same property as needed
2637 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2638 * for non-QoS-data frames. Here we know it's a data
2639 * frame, so count MSDUs.
2641 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2642 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2643 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2646 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2647 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2648 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2649 ehdr->h_proto != rx->sdata->control_port_protocol &&
2650 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2651 if (is_multicast_ether_addr(ehdr->h_dest) &&
2652 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2654 * send multicast frames both to higher layers in
2655 * local net stack and back to the wireless medium
2657 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2659 net_info_ratelimited("%s: failed to clone multicast frame\n",
2661 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2662 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2663 dsta = sta_info_get(sdata, ehdr->h_dest);
2666 * The destination station is associated to
2667 * this AP (in this VLAN), so send the frame
2668 * directly to it and do not pass it to local
2677 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2679 /* 'align' will only take the values 0 or 2 here since all
2680 * frames are required to be aligned to 2-byte boundaries
2681 * when being passed to mac80211; the code here works just
2682 * as well if that isn't true, but mac80211 assumes it can
2683 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2687 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2689 if (WARN_ON(skb_headroom(skb) < 3)) {
2693 u8 *data = skb->data;
2694 size_t len = skb_headlen(skb);
2696 memmove(skb->data, data, len);
2697 skb_set_tail_pointer(skb, len);
2704 skb->protocol = eth_type_trans(skb, dev);
2705 ieee80211_deliver_skb_to_local_stack(skb, rx);
2710 * Send to wireless media and increase priority by 256 to
2711 * keep the received priority instead of reclassifying
2712 * the frame (see cfg80211_classify8021d).
2714 xmit_skb->priority += 256;
2715 xmit_skb->protocol = htons(ETH_P_802_3);
2716 skb_reset_network_header(xmit_skb);
2717 skb_reset_mac_header(xmit_skb);
2718 dev_queue_xmit(xmit_skb);
2722 static ieee80211_rx_result debug_noinline
2723 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2725 struct net_device *dev = rx->sdata->dev;
2726 struct sk_buff *skb = rx->skb;
2727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2728 __le16 fc = hdr->frame_control;
2729 struct sk_buff_head frame_list;
2730 struct ethhdr ethhdr;
2731 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2733 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2736 } else switch (rx->sdata->vif.type) {
2737 case NL80211_IFTYPE_AP:
2738 case NL80211_IFTYPE_AP_VLAN:
2741 case NL80211_IFTYPE_STATION:
2743 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2746 case NL80211_IFTYPE_MESH_POINT:
2754 __skb_queue_head_init(&frame_list);
2756 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2757 rx->sdata->vif.addr,
2758 rx->sdata->vif.type,
2760 return RX_DROP_UNUSABLE;
2762 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2763 rx->sdata->vif.type,
2764 rx->local->hw.extra_tx_headroom,
2765 check_da, check_sa);
2767 while (!skb_queue_empty(&frame_list)) {
2768 rx->skb = __skb_dequeue(&frame_list);
2770 if (!ieee80211_frame_allowed(rx, fc)) {
2771 dev_kfree_skb(rx->skb);
2775 ieee80211_deliver_skb(rx);
2781 static ieee80211_rx_result debug_noinline
2782 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2784 struct sk_buff *skb = rx->skb;
2785 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2786 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2787 __le16 fc = hdr->frame_control;
2789 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2792 if (unlikely(!ieee80211_is_data(fc)))
2795 if (unlikely(!ieee80211_is_data_present(fc)))
2796 return RX_DROP_MONITOR;
2798 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2799 switch (rx->sdata->vif.type) {
2800 case NL80211_IFTYPE_AP_VLAN:
2801 if (!rx->sdata->u.vlan.sta)
2802 return RX_DROP_UNUSABLE;
2804 case NL80211_IFTYPE_STATION:
2805 if (!rx->sdata->u.mgd.use_4addr)
2806 return RX_DROP_UNUSABLE;
2809 return RX_DROP_UNUSABLE;
2813 if (is_multicast_ether_addr(hdr->addr1))
2814 return RX_DROP_UNUSABLE;
2818 * We should not receive A-MSDUs on pre-HT connections,
2819 * and HT connections cannot use old ciphers. Thus drop
2820 * them, as in those cases we couldn't even have SPP
2823 switch (rx->key->conf.cipher) {
2824 case WLAN_CIPHER_SUITE_WEP40:
2825 case WLAN_CIPHER_SUITE_WEP104:
2826 case WLAN_CIPHER_SUITE_TKIP:
2827 return RX_DROP_UNUSABLE;
2833 return __ieee80211_rx_h_amsdu(rx, 0);
2836 #ifdef CONFIG_MAC80211_MESH
2837 static ieee80211_rx_result
2838 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2840 struct ieee80211_hdr *fwd_hdr, *hdr;
2841 struct ieee80211_tx_info *info;
2842 struct ieee80211s_hdr *mesh_hdr;
2843 struct sk_buff *skb = rx->skb, *fwd_skb;
2844 struct ieee80211_local *local = rx->local;
2845 struct ieee80211_sub_if_data *sdata = rx->sdata;
2846 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2850 hdr = (struct ieee80211_hdr *) skb->data;
2851 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2853 /* make sure fixed part of mesh header is there, also checks skb len */
2854 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2855 return RX_DROP_MONITOR;
2857 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2859 /* make sure full mesh header is there, also checks skb len */
2860 if (!pskb_may_pull(rx->skb,
2861 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2862 return RX_DROP_MONITOR;
2864 /* reload pointers */
2865 hdr = (struct ieee80211_hdr *) skb->data;
2866 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2868 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2869 return RX_DROP_MONITOR;
2871 /* frame is in RMC, don't forward */
2872 if (ieee80211_is_data(hdr->frame_control) &&
2873 is_multicast_ether_addr(hdr->addr1) &&
2874 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2875 return RX_DROP_MONITOR;
2877 if (!ieee80211_is_data(hdr->frame_control))
2881 return RX_DROP_MONITOR;
2883 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2884 struct mesh_path *mppath;
2888 if (is_multicast_ether_addr(hdr->addr1)) {
2889 mpp_addr = hdr->addr3;
2890 proxied_addr = mesh_hdr->eaddr1;
2891 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2892 MESH_FLAGS_AE_A5_A6) {
2893 /* has_a4 already checked in ieee80211_rx_mesh_check */
2894 mpp_addr = hdr->addr4;
2895 proxied_addr = mesh_hdr->eaddr2;
2897 return RX_DROP_MONITOR;
2901 mppath = mpp_path_lookup(sdata, proxied_addr);
2903 mpp_path_add(sdata, proxied_addr, mpp_addr);
2905 spin_lock_bh(&mppath->state_lock);
2906 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2907 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2908 mppath->exp_time = jiffies;
2909 spin_unlock_bh(&mppath->state_lock);
2914 /* Frame has reached destination. Don't forward */
2915 if (!is_multicast_ether_addr(hdr->addr1) &&
2916 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2919 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2920 q = sdata->vif.hw_queue[ac];
2921 if (ieee80211_queue_stopped(&local->hw, q)) {
2922 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2923 return RX_DROP_MONITOR;
2925 skb_set_queue_mapping(skb, q);
2927 if (!--mesh_hdr->ttl) {
2928 if (!is_multicast_ether_addr(hdr->addr1))
2929 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2930 dropped_frames_ttl);
2934 if (!ifmsh->mshcfg.dot11MeshForwarding)
2937 if (sdata->crypto_tx_tailroom_needed_cnt)
2938 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2940 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2941 sdata->encrypt_headroom,
2942 tailroom, GFP_ATOMIC);
2946 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2947 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2948 info = IEEE80211_SKB_CB(fwd_skb);
2949 memset(info, 0, sizeof(*info));
2950 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2951 info->control.vif = &rx->sdata->vif;
2952 info->control.jiffies = jiffies;
2953 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2954 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2955 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2956 /* update power mode indication when forwarding */
2957 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2958 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2959 /* mesh power mode flags updated in mesh_nexthop_lookup */
2960 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2962 /* unable to resolve next hop */
2963 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2965 WLAN_REASON_MESH_PATH_NOFORWARD,
2967 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2969 return RX_DROP_MONITOR;
2972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2973 ieee80211_add_pending_skb(local, fwd_skb);
2975 if (is_multicast_ether_addr(hdr->addr1))
2977 return RX_DROP_MONITOR;
2981 static ieee80211_rx_result debug_noinline
2982 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2984 struct ieee80211_sub_if_data *sdata = rx->sdata;
2985 struct ieee80211_local *local = rx->local;
2986 struct net_device *dev = sdata->dev;
2987 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2988 __le16 fc = hdr->frame_control;
2992 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2995 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2996 return RX_DROP_MONITOR;
2999 * Send unexpected-4addr-frame event to hostapd. For older versions,
3000 * also drop the frame to cooked monitor interfaces.
3002 if (ieee80211_has_a4(hdr->frame_control) &&
3003 sdata->vif.type == NL80211_IFTYPE_AP) {
3005 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3006 cfg80211_rx_unexpected_4addr_frame(
3007 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3008 return RX_DROP_MONITOR;
3011 err = __ieee80211_data_to_8023(rx, &port_control);
3013 return RX_DROP_UNUSABLE;
3015 if (!ieee80211_frame_allowed(rx, fc))
3016 return RX_DROP_MONITOR;
3018 /* directly handle TDLS channel switch requests/responses */
3019 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3020 cpu_to_be16(ETH_P_TDLS))) {
3021 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3023 if (pskb_may_pull(rx->skb,
3024 offsetof(struct ieee80211_tdls_data, u)) &&
3025 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3026 tf->category == WLAN_CATEGORY_TDLS &&
3027 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3028 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3029 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3030 __ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3035 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3036 unlikely(port_control) && sdata->bss) {
3037 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3045 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3046 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3047 !is_multicast_ether_addr(
3048 ((struct ethhdr *)rx->skb->data)->h_dest) &&
3049 (!local->scanning &&
3050 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3051 mod_timer(&local->dynamic_ps_timer, jiffies +
3052 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3054 ieee80211_deliver_skb(rx);
3059 static ieee80211_rx_result debug_noinline
3060 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3062 struct sk_buff *skb = rx->skb;
3063 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3064 struct tid_ampdu_rx *tid_agg_rx;
3068 if (likely(!ieee80211_is_ctl(bar->frame_control)))
3071 if (ieee80211_is_back_req(bar->frame_control)) {
3073 __le16 control, start_seq_num;
3074 } __packed bar_data;
3075 struct ieee80211_event event = {
3076 .type = BAR_RX_EVENT,
3080 return RX_DROP_MONITOR;
3082 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3083 &bar_data, sizeof(bar_data)))
3084 return RX_DROP_MONITOR;
3086 tid = le16_to_cpu(bar_data.control) >> 12;
3088 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3089 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3090 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3091 WLAN_BACK_RECIPIENT,
3092 WLAN_REASON_QSTA_REQUIRE_SETUP);
3094 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3096 return RX_DROP_MONITOR;
3098 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3099 event.u.ba.tid = tid;
3100 event.u.ba.ssn = start_seq_num;
3101 event.u.ba.sta = &rx->sta->sta;
3103 /* reset session timer */
3104 if (tid_agg_rx->timeout)
3105 mod_timer(&tid_agg_rx->session_timer,
3106 TU_TO_EXP_TIME(tid_agg_rx->timeout));
3108 spin_lock(&tid_agg_rx->reorder_lock);
3109 /* release stored frames up to start of BAR */
3110 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3111 start_seq_num, frames);
3112 spin_unlock(&tid_agg_rx->reorder_lock);
3114 drv_event_callback(rx->local, rx->sdata, &event);
3121 * After this point, we only want management frames,
3122 * so we can drop all remaining control frames to
3123 * cooked monitor interfaces.
3125 return RX_DROP_MONITOR;
3128 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3129 struct ieee80211_mgmt *mgmt,
3132 struct ieee80211_local *local = sdata->local;
3133 struct sk_buff *skb;
3134 struct ieee80211_mgmt *resp;
3136 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3137 /* Not to own unicast address */
3141 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3142 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3143 /* Not from the current AP or not associated yet. */
3147 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3148 /* Too short SA Query request frame */
3152 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3156 skb_reserve(skb, local->hw.extra_tx_headroom);
3157 resp = skb_put_zero(skb, 24);
3158 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3159 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3160 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3161 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3162 IEEE80211_STYPE_ACTION);
3163 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3164 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3165 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3166 memcpy(resp->u.action.u.sa_query.trans_id,
3167 mgmt->u.action.u.sa_query.trans_id,
3168 WLAN_SA_QUERY_TR_ID_LEN);
3170 ieee80211_tx_skb(sdata, skb);
3173 static ieee80211_rx_result debug_noinline
3174 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3176 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3177 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3179 if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3183 * From here on, look only at management frames.
3184 * Data and control frames are already handled,
3185 * and unknown (reserved) frames are useless.
3187 if (rx->skb->len < 24)
3188 return RX_DROP_MONITOR;
3190 if (!ieee80211_is_mgmt(mgmt->frame_control))
3191 return RX_DROP_MONITOR;
3193 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3194 ieee80211_is_beacon(mgmt->frame_control) &&
3195 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3198 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3199 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3200 sig = status->signal;
3202 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3203 rx->skb->data, rx->skb->len,
3204 ieee80211_rx_status_to_khz(status),
3206 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3209 if (ieee80211_drop_unencrypted_mgmt(rx))
3210 return RX_DROP_UNUSABLE;
3215 static ieee80211_rx_result debug_noinline
3216 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3218 struct ieee80211_local *local = rx->local;
3219 struct ieee80211_sub_if_data *sdata = rx->sdata;
3220 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3221 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3222 int len = rx->skb->len;
3224 if (!ieee80211_is_action(mgmt->frame_control))
3227 /* drop too small frames */
3228 if (len < IEEE80211_MIN_ACTION_SIZE)
3229 return RX_DROP_UNUSABLE;
3231 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3232 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3233 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3234 return RX_DROP_UNUSABLE;
3236 switch (mgmt->u.action.category) {
3237 case WLAN_CATEGORY_HT:
3238 /* reject HT action frames from stations not supporting HT */
3239 if (!rx->sta->sta.ht_cap.ht_supported)
3242 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3243 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3244 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3245 sdata->vif.type != NL80211_IFTYPE_AP &&
3246 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3249 /* verify action & smps_control/chanwidth are present */
3250 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3253 switch (mgmt->u.action.u.ht_smps.action) {
3254 case WLAN_HT_ACTION_SMPS: {
3255 struct ieee80211_supported_band *sband;
3256 enum ieee80211_smps_mode smps_mode;
3257 struct sta_opmode_info sta_opmode = {};
3259 if (sdata->vif.type != NL80211_IFTYPE_AP &&
3260 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3263 /* convert to HT capability */
3264 switch (mgmt->u.action.u.ht_smps.smps_control) {
3265 case WLAN_HT_SMPS_CONTROL_DISABLED:
3266 smps_mode = IEEE80211_SMPS_OFF;
3268 case WLAN_HT_SMPS_CONTROL_STATIC:
3269 smps_mode = IEEE80211_SMPS_STATIC;
3271 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3272 smps_mode = IEEE80211_SMPS_DYNAMIC;
3278 /* if no change do nothing */
3279 if (rx->sta->sta.smps_mode == smps_mode)
3281 rx->sta->sta.smps_mode = smps_mode;
3282 sta_opmode.smps_mode =
3283 ieee80211_smps_mode_to_smps_mode(smps_mode);
3284 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3286 sband = rx->local->hw.wiphy->bands[status->band];
3288 rate_control_rate_update(local, sband, rx->sta,
3289 IEEE80211_RC_SMPS_CHANGED);
3290 cfg80211_sta_opmode_change_notify(sdata->dev,
3296 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3297 struct ieee80211_supported_band *sband;
3298 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3299 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3300 struct sta_opmode_info sta_opmode = {};
3302 /* If it doesn't support 40 MHz it can't change ... */
3303 if (!(rx->sta->sta.ht_cap.cap &
3304 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3307 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3308 max_bw = IEEE80211_STA_RX_BW_20;
3310 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3312 /* set cur_max_bandwidth and recalc sta bw */
3313 rx->sta->cur_max_bandwidth = max_bw;
3314 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3316 if (rx->sta->sta.bandwidth == new_bw)
3319 rx->sta->sta.bandwidth = new_bw;
3320 sband = rx->local->hw.wiphy->bands[status->band];
3322 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3323 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3325 rate_control_rate_update(local, sband, rx->sta,
3326 IEEE80211_RC_BW_CHANGED);
3327 cfg80211_sta_opmode_change_notify(sdata->dev,
3338 case WLAN_CATEGORY_PUBLIC:
3339 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3341 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3345 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3347 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3348 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3350 if (len < offsetof(struct ieee80211_mgmt,
3351 u.action.u.ext_chan_switch.variable))
3354 case WLAN_CATEGORY_VHT:
3355 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3356 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3357 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3358 sdata->vif.type != NL80211_IFTYPE_AP &&
3359 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3362 /* verify action code is present */
3363 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3366 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3367 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3368 /* verify opmode is present */
3369 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3373 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3374 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3382 case WLAN_CATEGORY_BACK:
3383 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3384 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3385 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3386 sdata->vif.type != NL80211_IFTYPE_AP &&
3387 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3390 /* verify action_code is present */
3391 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3394 switch (mgmt->u.action.u.addba_req.action_code) {
3395 case WLAN_ACTION_ADDBA_REQ:
3396 if (len < (IEEE80211_MIN_ACTION_SIZE +
3397 sizeof(mgmt->u.action.u.addba_req)))
3400 case WLAN_ACTION_ADDBA_RESP:
3401 if (len < (IEEE80211_MIN_ACTION_SIZE +
3402 sizeof(mgmt->u.action.u.addba_resp)))
3405 case WLAN_ACTION_DELBA:
3406 if (len < (IEEE80211_MIN_ACTION_SIZE +
3407 sizeof(mgmt->u.action.u.delba)))
3415 case WLAN_CATEGORY_SPECTRUM_MGMT:
3416 /* verify action_code is present */
3417 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3420 switch (mgmt->u.action.u.measurement.action_code) {
3421 case WLAN_ACTION_SPCT_MSR_REQ:
3422 if (status->band != NL80211_BAND_5GHZ)
3425 if (len < (IEEE80211_MIN_ACTION_SIZE +
3426 sizeof(mgmt->u.action.u.measurement)))
3429 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3432 ieee80211_process_measurement_req(sdata, mgmt, len);
3434 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3436 if (len < (IEEE80211_MIN_ACTION_SIZE +
3437 sizeof(mgmt->u.action.u.chan_switch)))
3440 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3441 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3442 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3445 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3446 bssid = sdata->u.mgd.bssid;
3447 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3448 bssid = sdata->u.ibss.bssid;
3449 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3454 if (!ether_addr_equal(mgmt->bssid, bssid))
3461 case WLAN_CATEGORY_SELF_PROTECTED:
3462 if (len < (IEEE80211_MIN_ACTION_SIZE +
3463 sizeof(mgmt->u.action.u.self_prot.action_code)))
3466 switch (mgmt->u.action.u.self_prot.action_code) {
3467 case WLAN_SP_MESH_PEERING_OPEN:
3468 case WLAN_SP_MESH_PEERING_CLOSE:
3469 case WLAN_SP_MESH_PEERING_CONFIRM:
3470 if (!ieee80211_vif_is_mesh(&sdata->vif))
3472 if (sdata->u.mesh.user_mpm)
3473 /* userspace handles this frame */
3476 case WLAN_SP_MGK_INFORM:
3477 case WLAN_SP_MGK_ACK:
3478 if (!ieee80211_vif_is_mesh(&sdata->vif))
3483 case WLAN_CATEGORY_MESH_ACTION:
3484 if (len < (IEEE80211_MIN_ACTION_SIZE +
3485 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3488 if (!ieee80211_vif_is_mesh(&sdata->vif))
3490 if (mesh_action_is_path_sel(mgmt) &&
3491 !mesh_path_sel_is_hwmp(sdata))
3499 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3500 /* will return in the next handlers */
3505 rx->sta->rx_stats.packets++;
3506 dev_kfree_skb(rx->skb);
3510 ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3514 static ieee80211_rx_result debug_noinline
3515 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3517 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3520 /* skip known-bad action frames and return them in the next handler */
3521 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3525 * Getting here means the kernel doesn't know how to handle
3526 * it, but maybe userspace does ... include returned frames
3527 * so userspace can register for those to know whether ones
3528 * it transmitted were processed or returned.
3531 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3532 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3533 sig = status->signal;
3535 if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev,
3536 ieee80211_rx_status_to_khz(status), sig,
3537 rx->skb->data, rx->skb->len, 0)) {
3539 rx->sta->rx_stats.packets++;
3540 dev_kfree_skb(rx->skb);
3547 static ieee80211_rx_result debug_noinline
3548 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3550 struct ieee80211_sub_if_data *sdata = rx->sdata;
3551 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3552 int len = rx->skb->len;
3554 if (!ieee80211_is_action(mgmt->frame_control))
3557 switch (mgmt->u.action.category) {
3558 case WLAN_CATEGORY_SA_QUERY:
3559 if (len < (IEEE80211_MIN_ACTION_SIZE +
3560 sizeof(mgmt->u.action.u.sa_query)))
3563 switch (mgmt->u.action.u.sa_query.action) {
3564 case WLAN_ACTION_SA_QUERY_REQUEST:
3565 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3567 ieee80211_process_sa_query_req(sdata, mgmt, len);
3577 rx->sta->rx_stats.packets++;
3578 dev_kfree_skb(rx->skb);
3582 static ieee80211_rx_result debug_noinline
3583 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3585 struct ieee80211_local *local = rx->local;
3586 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3587 struct sk_buff *nskb;
3588 struct ieee80211_sub_if_data *sdata = rx->sdata;
3589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3591 if (!ieee80211_is_action(mgmt->frame_control))
3595 * For AP mode, hostapd is responsible for handling any action
3596 * frames that we didn't handle, including returning unknown
3597 * ones. For all other modes we will return them to the sender,
3598 * setting the 0x80 bit in the action category, as required by
3599 * 802.11-2012 9.24.4.
3600 * Newer versions of hostapd shall also use the management frame
3601 * registration mechanisms, but older ones still use cooked
3602 * monitor interfaces so push all frames there.
3604 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3605 (sdata->vif.type == NL80211_IFTYPE_AP ||
3606 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3607 return RX_DROP_MONITOR;
3609 if (is_multicast_ether_addr(mgmt->da))
3610 return RX_DROP_MONITOR;
3612 /* do not return rejected action frames */
3613 if (mgmt->u.action.category & 0x80)
3614 return RX_DROP_UNUSABLE;
3616 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3619 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3621 nmgmt->u.action.category |= 0x80;
3622 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3623 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3625 memset(nskb->cb, 0, sizeof(nskb->cb));
3627 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3630 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3631 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3632 IEEE80211_TX_CTL_NO_CCK_RATE;
3633 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3635 local->hw.offchannel_tx_hw_queue;
3638 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3641 dev_kfree_skb(rx->skb);
3645 static ieee80211_rx_result debug_noinline
3646 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3648 struct ieee80211_sub_if_data *sdata = rx->sdata;
3649 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3651 if (!ieee80211_is_ext(hdr->frame_control))
3654 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3655 return RX_DROP_MONITOR;
3657 /* for now only beacons are ext, so queue them */
3658 ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3663 static ieee80211_rx_result debug_noinline
3664 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3666 struct ieee80211_sub_if_data *sdata = rx->sdata;
3667 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3670 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3672 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3673 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3674 sdata->vif.type != NL80211_IFTYPE_OCB &&
3675 sdata->vif.type != NL80211_IFTYPE_STATION)
3676 return RX_DROP_MONITOR;
3679 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3680 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3681 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3682 /* process for all: mesh, mlme, ibss */
3684 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3685 if (is_multicast_ether_addr(mgmt->da) &&
3686 !is_broadcast_ether_addr(mgmt->da))
3687 return RX_DROP_MONITOR;
3689 /* process only for station/IBSS */
3690 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3691 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3692 return RX_DROP_MONITOR;
3694 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3695 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3696 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3697 if (is_multicast_ether_addr(mgmt->da) &&
3698 !is_broadcast_ether_addr(mgmt->da))
3699 return RX_DROP_MONITOR;
3701 /* process only for station */
3702 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3703 return RX_DROP_MONITOR;
3705 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3706 /* process only for ibss and mesh */
3707 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3708 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3709 return RX_DROP_MONITOR;
3712 return RX_DROP_MONITOR;
3715 ieee80211_queue_skb_to_iface(sdata, rx->sta, rx->skb);
3720 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3721 struct ieee80211_rate *rate)
3723 struct ieee80211_sub_if_data *sdata;
3724 struct ieee80211_local *local = rx->local;
3725 struct sk_buff *skb = rx->skb, *skb2;
3726 struct net_device *prev_dev = NULL;
3727 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3728 int needed_headroom;
3731 * If cooked monitor has been processed already, then
3732 * don't do it again. If not, set the flag.
3734 if (rx->flags & IEEE80211_RX_CMNTR)
3736 rx->flags |= IEEE80211_RX_CMNTR;
3738 /* If there are no cooked monitor interfaces, just free the SKB */
3739 if (!local->cooked_mntrs)
3742 /* vendor data is long removed here */
3743 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3744 /* room for the radiotap header based on driver features */
3745 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3747 if (skb_headroom(skb) < needed_headroom &&
3748 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3751 /* prepend radiotap information */
3752 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3755 skb_reset_mac_header(skb);
3756 skb->ip_summed = CHECKSUM_UNNECESSARY;
3757 skb->pkt_type = PACKET_OTHERHOST;
3758 skb->protocol = htons(ETH_P_802_2);
3760 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3761 if (!ieee80211_sdata_running(sdata))
3764 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3765 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3769 skb2 = skb_clone(skb, GFP_ATOMIC);
3771 skb2->dev = prev_dev;
3772 netif_receive_skb(skb2);
3776 prev_dev = sdata->dev;
3777 dev_sw_netstats_rx_add(sdata->dev, skb->len);
3781 skb->dev = prev_dev;
3782 netif_receive_skb(skb);
3790 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3791 ieee80211_rx_result res)
3794 case RX_DROP_MONITOR:
3795 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3797 rx->sta->rx_stats.dropped++;
3800 struct ieee80211_rate *rate = NULL;
3801 struct ieee80211_supported_band *sband;
3802 struct ieee80211_rx_status *status;
3804 status = IEEE80211_SKB_RXCB((rx->skb));
3806 sband = rx->local->hw.wiphy->bands[status->band];
3807 if (status->encoding == RX_ENC_LEGACY)
3808 rate = &sband->bitrates[status->rate_idx];
3810 ieee80211_rx_cooked_monitor(rx, rate);
3813 case RX_DROP_UNUSABLE:
3814 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3816 rx->sta->rx_stats.dropped++;
3817 dev_kfree_skb(rx->skb);
3820 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3825 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3826 struct sk_buff_head *frames)
3828 ieee80211_rx_result res = RX_DROP_MONITOR;
3829 struct sk_buff *skb;
3831 #define CALL_RXH(rxh) \
3834 if (res != RX_CONTINUE) \
3838 /* Lock here to avoid hitting all of the data used in the RX
3839 * path (e.g. key data, station data, ...) concurrently when
3840 * a frame is released from the reorder buffer due to timeout
3841 * from the timer, potentially concurrently with RX from the
3844 spin_lock_bh(&rx->local->rx_path_lock);
3846 while ((skb = __skb_dequeue(frames))) {
3848 * all the other fields are valid across frames
3849 * that belong to an aMPDU since they are on the
3850 * same TID from the same station
3854 CALL_RXH(ieee80211_rx_h_check_more_data);
3855 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3856 CALL_RXH(ieee80211_rx_h_sta_process);
3857 CALL_RXH(ieee80211_rx_h_decrypt);
3858 CALL_RXH(ieee80211_rx_h_defragment);
3859 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3860 /* must be after MMIC verify so header is counted in MPDU mic */
3861 #ifdef CONFIG_MAC80211_MESH
3862 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3863 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3865 CALL_RXH(ieee80211_rx_h_amsdu);
3866 CALL_RXH(ieee80211_rx_h_data);
3868 /* special treatment -- needs the queue */
3869 res = ieee80211_rx_h_ctrl(rx, frames);
3870 if (res != RX_CONTINUE)
3873 CALL_RXH(ieee80211_rx_h_mgmt_check);
3874 CALL_RXH(ieee80211_rx_h_action);
3875 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3876 CALL_RXH(ieee80211_rx_h_action_post_userspace);
3877 CALL_RXH(ieee80211_rx_h_action_return);
3878 CALL_RXH(ieee80211_rx_h_ext);
3879 CALL_RXH(ieee80211_rx_h_mgmt);
3882 ieee80211_rx_handlers_result(rx, res);
3887 spin_unlock_bh(&rx->local->rx_path_lock);
3890 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3892 struct sk_buff_head reorder_release;
3893 ieee80211_rx_result res = RX_DROP_MONITOR;
3895 __skb_queue_head_init(&reorder_release);
3897 #define CALL_RXH(rxh) \
3900 if (res != RX_CONTINUE) \
3904 CALL_RXH(ieee80211_rx_h_check_dup);
3905 CALL_RXH(ieee80211_rx_h_check);
3907 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3909 ieee80211_rx_handlers(rx, &reorder_release);
3913 ieee80211_rx_handlers_result(rx, res);
3919 * This function makes calls into the RX path, therefore
3920 * it has to be invoked under RCU read lock.
3922 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3924 struct sk_buff_head frames;
3925 struct ieee80211_rx_data rx = {
3927 .sdata = sta->sdata,
3928 .local = sta->local,
3929 /* This is OK -- must be QoS data frame */
3930 .security_idx = tid,
3933 struct tid_ampdu_rx *tid_agg_rx;
3935 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3939 __skb_queue_head_init(&frames);
3941 spin_lock(&tid_agg_rx->reorder_lock);
3942 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3943 spin_unlock(&tid_agg_rx->reorder_lock);
3945 if (!skb_queue_empty(&frames)) {
3946 struct ieee80211_event event = {
3947 .type = BA_FRAME_TIMEOUT,
3949 .u.ba.sta = &sta->sta,
3951 drv_event_callback(rx.local, rx.sdata, &event);
3954 ieee80211_rx_handlers(&rx, &frames);
3957 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3958 u16 ssn, u64 filtered,
3961 struct sta_info *sta;
3962 struct tid_ampdu_rx *tid_agg_rx;
3963 struct sk_buff_head frames;
3964 struct ieee80211_rx_data rx = {
3965 /* This is OK -- must be QoS data frame */
3966 .security_idx = tid,
3971 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3974 __skb_queue_head_init(&frames);
3976 sta = container_of(pubsta, struct sta_info, sta);
3979 rx.sdata = sta->sdata;
3980 rx.local = sta->local;
3983 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3987 spin_lock_bh(&tid_agg_rx->reorder_lock);
3989 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3992 /* release all frames in the reorder buffer */
3993 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3994 IEEE80211_SN_MODULO;
3995 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3997 /* update ssn to match received ssn */
3998 tid_agg_rx->head_seq_num = ssn;
4000 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4004 /* handle the case that received ssn is behind the mac ssn.
4005 * it can be tid_agg_rx->buf_size behind and still be valid */
4006 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4007 if (diff >= tid_agg_rx->buf_size) {
4008 tid_agg_rx->reorder_buf_filtered = 0;
4011 filtered = filtered >> diff;
4015 for (i = 0; i < tid_agg_rx->buf_size; i++) {
4016 int index = (ssn + i) % tid_agg_rx->buf_size;
4018 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4019 if (filtered & BIT_ULL(i))
4020 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4023 /* now process also frames that the filter marking released */
4024 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4027 spin_unlock_bh(&tid_agg_rx->reorder_lock);
4029 ieee80211_rx_handlers(&rx, &frames);
4034 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4036 /* main receive path */
4038 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4040 struct ieee80211_sub_if_data *sdata = rx->sdata;
4041 struct sk_buff *skb = rx->skb;
4042 struct ieee80211_hdr *hdr = (void *)skb->data;
4043 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4044 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4045 bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4046 ieee80211_is_s1g_beacon(hdr->frame_control);
4048 switch (sdata->vif.type) {
4049 case NL80211_IFTYPE_STATION:
4050 if (!bssid && !sdata->u.mgd.use_4addr)
4052 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4056 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4057 case NL80211_IFTYPE_ADHOC:
4060 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4061 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
4063 if (ieee80211_is_beacon(hdr->frame_control))
4065 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4068 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4072 if (status->encoding != RX_ENC_LEGACY)
4073 rate_idx = 0; /* TODO: HT/VHT rates */
4075 rate_idx = status->rate_idx;
4076 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4080 case NL80211_IFTYPE_OCB:
4083 if (!ieee80211_is_data_present(hdr->frame_control))
4085 if (!is_broadcast_ether_addr(bssid))
4088 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4092 if (status->encoding != RX_ENC_LEGACY)
4093 rate_idx = 0; /* TODO: HT rates */
4095 rate_idx = status->rate_idx;
4096 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4100 case NL80211_IFTYPE_MESH_POINT:
4101 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4105 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4106 case NL80211_IFTYPE_AP_VLAN:
4107 case NL80211_IFTYPE_AP:
4109 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4111 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4113 * Accept public action frames even when the
4114 * BSSID doesn't match, this is used for P2P
4115 * and location updates. Note that mac80211
4116 * itself never looks at these frames.
4119 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4121 if (ieee80211_is_public_action(hdr, skb->len))
4123 return ieee80211_is_beacon(hdr->frame_control);
4126 if (!ieee80211_has_tods(hdr->frame_control)) {
4127 /* ignore data frames to TDLS-peers */
4128 if (ieee80211_is_data(hdr->frame_control))
4130 /* ignore action frames to TDLS-peers */
4131 if (ieee80211_is_action(hdr->frame_control) &&
4132 !is_broadcast_ether_addr(bssid) &&
4133 !ether_addr_equal(bssid, hdr->addr1))
4138 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4139 * the BSSID - we've checked that already but may have accepted
4140 * the wildcard (ff:ff:ff:ff:ff:ff).
4143 * The BSSID of the Data frame is determined as follows:
4144 * a) If the STA is contained within an AP or is associated
4145 * with an AP, the BSSID is the address currently in use
4146 * by the STA contained in the AP.
4148 * So we should not accept data frames with an address that's
4151 * Accepting it also opens a security problem because stations
4152 * could encrypt it with the GTK and inject traffic that way.
4154 if (ieee80211_is_data(hdr->frame_control) && multicast)
4158 case NL80211_IFTYPE_P2P_DEVICE:
4159 return ieee80211_is_public_action(hdr, skb->len) ||
4160 ieee80211_is_probe_req(hdr->frame_control) ||
4161 ieee80211_is_probe_resp(hdr->frame_control) ||
4162 ieee80211_is_beacon(hdr->frame_control);
4163 case NL80211_IFTYPE_NAN:
4164 /* Currently no frames on NAN interface are allowed */
4174 void ieee80211_check_fast_rx(struct sta_info *sta)
4176 struct ieee80211_sub_if_data *sdata = sta->sdata;
4177 struct ieee80211_local *local = sdata->local;
4178 struct ieee80211_key *key;
4179 struct ieee80211_fast_rx fastrx = {
4181 .vif_type = sdata->vif.type,
4182 .control_port_protocol = sdata->control_port_protocol,
4183 }, *old, *new = NULL;
4184 bool set_offload = false;
4185 bool assign = false;
4188 /* use sparse to check that we don't return without updating */
4189 __acquire(check_fast_rx);
4191 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4192 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4193 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4194 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4196 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4198 /* fast-rx doesn't do reordering */
4199 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4200 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4203 switch (sdata->vif.type) {
4204 case NL80211_IFTYPE_STATION:
4205 if (sta->sta.tdls) {
4206 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4207 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4208 fastrx.expected_ds_bits = 0;
4210 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4211 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4212 fastrx.expected_ds_bits =
4213 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4216 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4217 fastrx.expected_ds_bits |=
4218 cpu_to_le16(IEEE80211_FCTL_TODS);
4219 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4220 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4223 if (!sdata->u.mgd.powersave)
4226 /* software powersave is a huge mess, avoid all of it */
4227 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4229 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4230 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4233 case NL80211_IFTYPE_AP_VLAN:
4234 case NL80211_IFTYPE_AP:
4235 /* parallel-rx requires this, at least with calls to
4236 * ieee80211_sta_ps_transition()
4238 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4240 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4241 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4242 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4244 fastrx.internal_forward =
4245 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4246 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4247 !sdata->u.vlan.sta);
4249 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4250 sdata->u.vlan.sta) {
4251 fastrx.expected_ds_bits |=
4252 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4253 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4254 fastrx.internal_forward = 0;
4262 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4266 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4268 key = rcu_dereference(sdata->default_unicast_key);
4270 switch (key->conf.cipher) {
4271 case WLAN_CIPHER_SUITE_TKIP:
4272 /* we don't want to deal with MMIC in fast-rx */
4274 case WLAN_CIPHER_SUITE_CCMP:
4275 case WLAN_CIPHER_SUITE_CCMP_256:
4276 case WLAN_CIPHER_SUITE_GCMP:
4277 case WLAN_CIPHER_SUITE_GCMP_256:
4280 /* We also don't want to deal with
4281 * WEP or cipher scheme.
4287 fastrx.icv_len = key->conf.icv_len;
4294 __release(check_fast_rx);
4297 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4300 (sdata->vif.offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED);
4303 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4305 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4308 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4310 spin_lock_bh(&sta->lock);
4311 old = rcu_dereference_protected(sta->fast_rx, true);
4312 rcu_assign_pointer(sta->fast_rx, new);
4313 spin_unlock_bh(&sta->lock);
4316 kfree_rcu(old, rcu_head);
4319 void ieee80211_clear_fast_rx(struct sta_info *sta)
4321 struct ieee80211_fast_rx *old;
4323 spin_lock_bh(&sta->lock);
4324 old = rcu_dereference_protected(sta->fast_rx, true);
4325 RCU_INIT_POINTER(sta->fast_rx, NULL);
4326 spin_unlock_bh(&sta->lock);
4329 kfree_rcu(old, rcu_head);
4332 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4334 struct ieee80211_local *local = sdata->local;
4335 struct sta_info *sta;
4337 lockdep_assert_held(&local->sta_mtx);
4339 list_for_each_entry(sta, &local->sta_list, list) {
4340 if (sdata != sta->sdata &&
4341 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4343 ieee80211_check_fast_rx(sta);
4347 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4349 struct ieee80211_local *local = sdata->local;
4351 mutex_lock(&local->sta_mtx);
4352 __ieee80211_check_fast_rx_iface(sdata);
4353 mutex_unlock(&local->sta_mtx);
4356 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4357 struct ieee80211_fast_rx *fast_rx,
4360 struct ieee80211_sta_rx_stats *stats;
4361 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4362 struct sta_info *sta = rx->sta;
4363 struct sk_buff *skb = rx->skb;
4364 void *sa = skb->data + ETH_ALEN;
4365 void *da = skb->data;
4367 stats = &sta->rx_stats;
4368 if (fast_rx->uses_rss)
4369 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4371 /* statistics part of ieee80211_rx_h_sta_process() */
4372 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4373 stats->last_signal = status->signal;
4374 if (!fast_rx->uses_rss)
4375 ewma_signal_add(&sta->rx_stats_avg.signal,
4379 if (status->chains) {
4382 stats->chains = status->chains;
4383 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4384 int signal = status->chain_signal[i];
4386 if (!(status->chains & BIT(i)))
4389 stats->chain_signal_last[i] = signal;
4390 if (!fast_rx->uses_rss)
4391 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4395 /* end of statistics */
4397 stats->last_rx = jiffies;
4398 stats->last_rate = sta_stats_encode_rate(status);
4403 skb->dev = fast_rx->dev;
4405 dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4407 /* The seqno index has the same property as needed
4408 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4409 * for non-QoS-data frames. Here we know it's a data
4410 * frame, so count MSDUs.
4412 u64_stats_update_begin(&stats->syncp);
4413 stats->msdu[rx->seqno_idx]++;
4414 stats->bytes += orig_len;
4415 u64_stats_update_end(&stats->syncp);
4417 if (fast_rx->internal_forward) {
4418 struct sk_buff *xmit_skb = NULL;
4419 if (is_multicast_ether_addr(da)) {
4420 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4421 } else if (!ether_addr_equal(da, sa) &&
4422 sta_info_get(rx->sdata, da)) {
4429 * Send to wireless media and increase priority by 256
4430 * to keep the received priority instead of
4431 * reclassifying the frame (see cfg80211_classify8021d).
4433 xmit_skb->priority += 256;
4434 xmit_skb->protocol = htons(ETH_P_802_3);
4435 skb_reset_network_header(xmit_skb);
4436 skb_reset_mac_header(xmit_skb);
4437 dev_queue_xmit(xmit_skb);
4444 /* deliver to local stack */
4445 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4446 memset(skb->cb, 0, sizeof(skb->cb));
4448 list_add_tail(&skb->list, rx->list);
4450 netif_receive_skb(skb);
4454 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4455 struct ieee80211_fast_rx *fast_rx)
4457 struct sk_buff *skb = rx->skb;
4458 struct ieee80211_hdr *hdr = (void *)skb->data;
4459 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4460 struct sta_info *sta = rx->sta;
4461 int orig_len = skb->len;
4462 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4463 int snap_offs = hdrlen;
4465 u8 snap[sizeof(rfc1042_header)];
4467 } *payload __aligned(2);
4471 } addrs __aligned(2);
4472 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4474 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4475 * to a common data structure; drivers can implement that per queue
4476 * but we don't have that information in mac80211
4478 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4481 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4483 /* If using encryption, we also need to have:
4484 * - PN_VALIDATED: similar, but the implementation is tricky
4485 * - DECRYPTED: necessary for PN_VALIDATED
4488 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4491 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4494 if (unlikely(ieee80211_is_frag(hdr)))
4497 /* Since our interface address cannot be multicast, this
4498 * implicitly also rejects multicast frames without the
4501 * We shouldn't get any *data* frames not addressed to us
4502 * (AP mode will accept multicast *management* frames), but
4503 * punting here will make it go through the full checks in
4504 * ieee80211_accept_frame().
4506 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4509 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4510 IEEE80211_FCTL_TODS)) !=
4511 fast_rx->expected_ds_bits)
4514 /* assign the key to drop unencrypted frames (later)
4515 * and strip the IV/MIC if necessary
4517 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4518 /* GCMP header length is the same */
4519 snap_offs += IEEE80211_CCMP_HDR_LEN;
4522 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4523 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4526 payload = (void *)(skb->data + snap_offs);
4528 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4531 /* Don't handle these here since they require special code.
4532 * Accept AARP and IPX even though they should come with a
4533 * bridge-tunnel header - but if we get them this way then
4534 * there's little point in discarding them.
4536 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4537 payload->proto == fast_rx->control_port_protocol))
4541 /* after this point, don't punt to the slowpath! */
4543 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4544 pskb_trim(skb, skb->len - fast_rx->icv_len))
4547 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4550 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4551 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4558 /* do the header conversion - first grab the addresses */
4559 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4560 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4561 /* remove the SNAP but leave the ethertype */
4562 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4563 /* push the addresses in front */
4564 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4566 ieee80211_rx_8023(rx, fast_rx, orig_len);
4571 if (fast_rx->uses_rss)
4572 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4579 * This function returns whether or not the SKB
4580 * was destined for RX processing or not, which,
4581 * if consume is true, is equivalent to whether
4582 * or not the skb was consumed.
4584 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4585 struct sk_buff *skb, bool consume)
4587 struct ieee80211_local *local = rx->local;
4588 struct ieee80211_sub_if_data *sdata = rx->sdata;
4592 /* See if we can do fast-rx; if we have to copy we already lost,
4593 * so punt in that case. We should never have to deliver a data
4594 * frame to multiple interfaces anyway.
4596 * We skip the ieee80211_accept_frame() call and do the necessary
4597 * checking inside ieee80211_invoke_fast_rx().
4599 if (consume && rx->sta) {
4600 struct ieee80211_fast_rx *fast_rx;
4602 fast_rx = rcu_dereference(rx->sta->fast_rx);
4603 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4607 if (!ieee80211_accept_frame(rx))
4611 skb = skb_copy(skb, GFP_ATOMIC);
4613 if (net_ratelimit())
4614 wiphy_debug(local->hw.wiphy,
4615 "failed to copy skb for %s\n",
4623 ieee80211_invoke_rx_handlers(rx);
4627 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4628 struct ieee80211_sta *pubsta,
4629 struct sk_buff *skb,
4630 struct list_head *list)
4632 struct ieee80211_local *local = hw_to_local(hw);
4633 struct ieee80211_fast_rx *fast_rx;
4634 struct ieee80211_rx_data rx;
4636 memset(&rx, 0, sizeof(rx));
4641 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4643 /* drop frame if too short for header */
4644 if (skb->len < sizeof(struct ethhdr))
4650 rx.sta = container_of(pubsta, struct sta_info, sta);
4651 rx.sdata = rx.sta->sdata;
4653 fast_rx = rcu_dereference(rx.sta->fast_rx);
4657 ieee80211_rx_8023(&rx, fast_rx, skb->len);
4665 * This is the actual Rx frames handler. as it belongs to Rx path it must
4666 * be called with rcu_read_lock protection.
4668 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4669 struct ieee80211_sta *pubsta,
4670 struct sk_buff *skb,
4671 struct list_head *list)
4673 struct ieee80211_local *local = hw_to_local(hw);
4674 struct ieee80211_sub_if_data *sdata;
4675 struct ieee80211_hdr *hdr;
4677 struct ieee80211_rx_data rx;
4678 struct ieee80211_sub_if_data *prev;
4679 struct rhlist_head *tmp;
4682 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4683 memset(&rx, 0, sizeof(rx));
4688 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4689 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4691 if (ieee80211_is_mgmt(fc)) {
4692 /* drop frame if too short for header */
4693 if (skb->len < ieee80211_hdrlen(fc))
4696 err = skb_linearize(skb);
4698 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4706 hdr = (struct ieee80211_hdr *)skb->data;
4707 ieee80211_parse_qos(&rx);
4708 ieee80211_verify_alignment(&rx);
4710 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4711 ieee80211_is_beacon(hdr->frame_control) ||
4712 ieee80211_is_s1g_beacon(hdr->frame_control)))
4713 ieee80211_scan_rx(local, skb);
4715 if (ieee80211_is_data(fc)) {
4716 struct sta_info *sta, *prev_sta;
4719 rx.sta = container_of(pubsta, struct sta_info, sta);
4720 rx.sdata = rx.sta->sdata;
4721 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4728 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4735 rx.sdata = prev_sta->sdata;
4736 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4743 rx.sdata = prev_sta->sdata;
4745 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4753 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4754 if (!ieee80211_sdata_running(sdata))
4757 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4758 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4762 * frame is destined for this interface, but if it's
4763 * not also for the previous one we handle that after
4764 * the loop to avoid copying the SKB once too much
4772 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4774 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4780 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4783 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4792 * This is the receive path handler. It is called by a low level driver when an
4793 * 802.11 MPDU is received from the hardware.
4795 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4796 struct sk_buff *skb, struct list_head *list)
4798 struct ieee80211_local *local = hw_to_local(hw);
4799 struct ieee80211_rate *rate = NULL;
4800 struct ieee80211_supported_band *sband;
4801 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4803 WARN_ON_ONCE(softirq_count() == 0);
4805 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4808 sband = local->hw.wiphy->bands[status->band];
4809 if (WARN_ON(!sband))
4813 * If we're suspending, it is possible although not too likely
4814 * that we'd be receiving frames after having already partially
4815 * quiesced the stack. We can't process such frames then since
4816 * that might, for example, cause stations to be added or other
4817 * driver callbacks be invoked.
4819 if (unlikely(local->quiescing || local->suspended))
4822 /* We might be during a HW reconfig, prevent Rx for the same reason */
4823 if (unlikely(local->in_reconfig))
4827 * The same happens when we're not even started,
4828 * but that's worth a warning.
4830 if (WARN_ON(!local->started))
4833 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4835 * Validate the rate, unless a PLCP error means that
4836 * we probably can't have a valid rate here anyway.
4839 switch (status->encoding) {
4842 * rate_idx is MCS index, which can be [0-76]
4845 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
4847 * Anything else would be some sort of driver or
4848 * hardware error. The driver should catch hardware
4851 if (WARN(status->rate_idx > 76,
4852 "Rate marked as an HT rate but passed "
4853 "status->rate_idx is not "
4854 "an MCS index [0-76]: %d (0x%02x)\n",
4860 if (WARN_ONCE(status->rate_idx > 9 ||
4863 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4864 status->rate_idx, status->nss))
4868 if (WARN_ONCE(status->rate_idx > 11 ||
4871 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4872 status->rate_idx, status->nss))
4879 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4881 rate = &sband->bitrates[status->rate_idx];
4885 status->rx_flags = 0;
4887 kcov_remote_start_common(skb_get_kcov_handle(skb));
4890 * Frames with failed FCS/PLCP checksum are not returned,
4891 * all other frames are returned without radiotap header
4892 * if it was previously present.
4893 * Also, frames with less than 16 bytes are dropped.
4895 if (!(status->flag & RX_FLAG_8023))
4896 skb = ieee80211_rx_monitor(local, skb, rate);
4898 ieee80211_tpt_led_trig_rx(local,
4899 ((struct ieee80211_hdr *)skb->data)->frame_control,
4902 if (status->flag & RX_FLAG_8023)
4903 __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
4905 __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
4913 EXPORT_SYMBOL(ieee80211_rx_list);
4915 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4916 struct sk_buff *skb, struct napi_struct *napi)
4918 struct sk_buff *tmp;
4923 * key references and virtual interfaces are protected using RCU
4924 * and this requires that we are in a read-side RCU section during
4925 * receive processing
4928 ieee80211_rx_list(hw, pubsta, skb, &list);
4932 netif_receive_skb_list(&list);
4936 list_for_each_entry_safe(skb, tmp, &list, list) {
4937 skb_list_del_init(skb);
4938 napi_gro_receive(napi, skb);
4941 EXPORT_SYMBOL(ieee80211_rx_napi);
4943 /* This is a version of the rx handler that can be called from hard irq
4944 * context. Post the skb on the queue and schedule the tasklet */
4945 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4947 struct ieee80211_local *local = hw_to_local(hw);
4949 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4951 skb->pkt_type = IEEE80211_RX_MSG;
4952 skb_queue_tail(&local->skb_queue, skb);
4953 tasklet_schedule(&local->tasklet);
4955 EXPORT_SYMBOL(ieee80211_rx_irqsafe);