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) 2018-2020 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/bitops.h>
21 #include <net/mac80211.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <asm/unaligned.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
39 u64_stats_update_begin(&tstats->syncp);
41 tstats->rx_bytes += len;
42 u64_stats_update_end(&tstats->syncp);
45 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
48 __le16 fc = hdr->frame_control;
50 if (ieee80211_is_data(fc)) {
51 if (len < 24) /* drop incorrect hdr len (data) */
54 if (ieee80211_has_a4(fc))
56 if (ieee80211_has_tods(fc))
58 if (ieee80211_has_fromds(fc))
64 if (ieee80211_is_mgmt(fc)) {
65 if (len < 24) /* drop incorrect hdr len (mgmt) */
70 if (ieee80211_is_ctl(fc)) {
71 if (ieee80211_is_pspoll(fc))
74 if (ieee80211_is_back_req(fc)) {
76 case NL80211_IFTYPE_STATION:
78 case NL80211_IFTYPE_AP:
79 case NL80211_IFTYPE_AP_VLAN:
82 break; /* fall through to the return */
91 * monitor mode reception
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
96 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
97 unsigned int present_fcs_len,
98 unsigned int rtap_space)
100 struct ieee80211_hdr *hdr;
105 __pskb_trim(skb, skb->len - present_fcs_len);
106 __pskb_pull(skb, rtap_space);
108 hdr = (void *)skb->data;
109 fc = hdr->frame_control;
112 * Remove the HT-Control field (if present) on management
113 * frames after we've sent the frame to monitoring. We
114 * (currently) don't need it, and don't properly parse
115 * frames with it present, due to the assumption of a
116 * fixed management header length.
118 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
121 hdrlen = ieee80211_hdrlen(fc);
122 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
124 if (!pskb_may_pull(skb, hdrlen)) {
129 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
130 hdrlen - IEEE80211_HT_CTL_LEN);
131 __pskb_pull(skb, IEEE80211_HT_CTL_LEN);
136 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
137 unsigned int rtap_space)
139 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
140 struct ieee80211_hdr *hdr;
142 hdr = (void *)(skb->data + rtap_space);
144 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
145 RX_FLAG_FAILED_PLCP_CRC |
146 RX_FLAG_ONLY_MONITOR |
150 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
153 if (ieee80211_is_ctl(hdr->frame_control) &&
154 !ieee80211_is_pspoll(hdr->frame_control) &&
155 !ieee80211_is_back_req(hdr->frame_control))
162 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
163 struct ieee80211_rx_status *status,
168 /* always present fields */
169 len = sizeof(struct ieee80211_radiotap_header) + 8;
171 /* allocate extra bitmaps */
173 len += 4 * hweight8(status->chains);
174 /* vendor presence bitmap */
175 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
178 if (ieee80211_have_rx_timestamp(status)) {
182 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
185 /* antenna field, if we don't have per-chain info */
189 /* padding for RX_FLAGS if necessary */
192 if (status->encoding == RX_ENC_HT) /* HT info */
195 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
200 if (status->encoding == RX_ENC_VHT) {
205 if (local->hw.radiotap_timestamp.units_pos >= 0) {
210 if (status->encoding == RX_ENC_HE &&
211 status->flag & RX_FLAG_RADIOTAP_HE) {
214 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
217 if (status->encoding == RX_ENC_HE &&
218 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
221 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
224 if (status->flag & RX_FLAG_NO_PSDU)
227 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
230 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
233 if (status->chains) {
234 /* antenna and antenna signal fields */
235 len += 2 * hweight8(status->chains);
238 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
239 struct ieee80211_vendor_radiotap *rtap;
240 int vendor_data_offset = 0;
243 * The position to look at depends on the existence (or non-
244 * existence) of other elements, so take that into account...
246 if (status->flag & RX_FLAG_RADIOTAP_HE)
247 vendor_data_offset +=
248 sizeof(struct ieee80211_radiotap_he);
249 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
250 vendor_data_offset +=
251 sizeof(struct ieee80211_radiotap_he_mu);
252 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
253 vendor_data_offset +=
254 sizeof(struct ieee80211_radiotap_lsig);
256 rtap = (void *)&skb->data[vendor_data_offset];
258 /* alignment for fixed 6-byte vendor data header */
260 /* vendor data header */
262 if (WARN_ON(rtap->align == 0))
264 len = ALIGN(len, rtap->align);
265 len += rtap->len + rtap->pad;
271 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
276 struct ieee80211_hdr_3addr hdr;
279 } __packed __aligned(2) action;
284 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
286 if (skb->len < rtap_space + sizeof(action) +
287 VHT_MUMIMO_GROUPS_DATA_LEN)
290 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
293 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
295 if (!ieee80211_is_action(action.hdr.frame_control))
298 if (action.category != WLAN_CATEGORY_VHT)
301 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
304 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
307 skb = skb_copy(skb, GFP_ATOMIC);
311 skb_queue_tail(&sdata->skb_queue, skb);
312 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
316 * ieee80211_add_rx_radiotap_header - add radiotap header
318 * add a radiotap header containing all the fields which the hardware provided.
321 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
323 struct ieee80211_rate *rate,
324 int rtap_len, bool has_fcs)
326 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
327 struct ieee80211_radiotap_header *rthdr;
332 u16 channel_flags = 0;
334 unsigned long chains = status->chains;
335 struct ieee80211_vendor_radiotap rtap = {};
336 struct ieee80211_radiotap_he he = {};
337 struct ieee80211_radiotap_he_mu he_mu = {};
338 struct ieee80211_radiotap_lsig lsig = {};
340 if (status->flag & RX_FLAG_RADIOTAP_HE) {
341 he = *(struct ieee80211_radiotap_he *)skb->data;
342 skb_pull(skb, sizeof(he));
343 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
346 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
347 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
348 skb_pull(skb, sizeof(he_mu));
351 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
352 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
353 skb_pull(skb, sizeof(lsig));
356 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
357 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
358 /* rtap.len and rtap.pad are undone immediately */
359 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
363 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
366 rthdr = skb_push(skb, rtap_len);
367 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
368 it_present = &rthdr->it_present;
370 /* radiotap header, set always present flags */
371 rthdr->it_len = cpu_to_le16(rtap_len);
372 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
373 BIT(IEEE80211_RADIOTAP_CHANNEL) |
374 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
377 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
379 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
381 BIT(IEEE80211_RADIOTAP_EXT) |
382 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
383 put_unaligned_le32(it_present_val, it_present);
385 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
386 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
389 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
390 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
391 BIT(IEEE80211_RADIOTAP_EXT);
392 put_unaligned_le32(it_present_val, it_present);
394 it_present_val = rtap.present;
397 put_unaligned_le32(it_present_val, it_present);
399 pos = (void *)(it_present + 1);
401 /* the order of the following fields is important */
403 /* IEEE80211_RADIOTAP_TSFT */
404 if (ieee80211_have_rx_timestamp(status)) {
406 while ((pos - (u8 *)rthdr) & 7)
409 ieee80211_calculate_rx_timestamp(local, status,
412 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
416 /* IEEE80211_RADIOTAP_FLAGS */
417 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
418 *pos |= IEEE80211_RADIOTAP_F_FCS;
419 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
420 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
421 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
422 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
425 /* IEEE80211_RADIOTAP_RATE */
426 if (!rate || status->encoding != RX_ENC_LEGACY) {
428 * Without rate information don't add it. If we have,
429 * MCS information is a separate field in radiotap,
430 * added below. The byte here is needed as padding
431 * for the channel though, so initialise it to 0.
436 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
437 if (status->bw == RATE_INFO_BW_10)
439 else if (status->bw == RATE_INFO_BW_5)
441 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
445 /* IEEE80211_RADIOTAP_CHANNEL */
446 /* TODO: frequency offset in KHz */
447 put_unaligned_le16(status->freq, pos);
449 if (status->bw == RATE_INFO_BW_10)
450 channel_flags |= IEEE80211_CHAN_HALF;
451 else if (status->bw == RATE_INFO_BW_5)
452 channel_flags |= IEEE80211_CHAN_QUARTER;
454 if (status->band == NL80211_BAND_5GHZ)
455 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
456 else if (status->encoding != RX_ENC_LEGACY)
457 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
458 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
459 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
461 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
463 channel_flags |= IEEE80211_CHAN_2GHZ;
464 put_unaligned_le16(channel_flags, pos);
467 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
468 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
469 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
470 *pos = status->signal;
472 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
476 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
478 if (!status->chains) {
479 /* IEEE80211_RADIOTAP_ANTENNA */
480 *pos = status->antenna;
484 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
486 /* IEEE80211_RADIOTAP_RX_FLAGS */
487 /* ensure 2 byte alignment for the 2 byte field as required */
488 if ((pos - (u8 *)rthdr) & 1)
490 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
491 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
492 put_unaligned_le16(rx_flags, pos);
495 if (status->encoding == RX_ENC_HT) {
498 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
499 *pos++ = local->hw.radiotap_mcs_details;
501 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
502 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
503 if (status->bw == RATE_INFO_BW_40)
504 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
505 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
506 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
507 if (status->enc_flags & RX_ENC_FLAG_LDPC)
508 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
509 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
510 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
512 *pos++ = status->rate_idx;
515 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
518 /* ensure 4 byte alignment */
519 while ((pos - (u8 *)rthdr) & 3)
522 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
523 put_unaligned_le32(status->ampdu_reference, pos);
525 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
526 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
527 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
528 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
529 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
530 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
531 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
532 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
533 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
534 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
535 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
536 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
537 put_unaligned_le16(flags, pos);
539 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
540 *pos++ = status->ampdu_delimiter_crc;
546 if (status->encoding == RX_ENC_VHT) {
547 u16 known = local->hw.radiotap_vht_details;
549 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
550 put_unaligned_le16(known, pos);
553 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
554 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
555 /* in VHT, STBC is binary */
556 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
557 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
558 if (status->enc_flags & RX_ENC_FLAG_BF)
559 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
562 switch (status->bw) {
563 case RATE_INFO_BW_80:
566 case RATE_INFO_BW_160:
569 case RATE_INFO_BW_40:
576 *pos = (status->rate_idx << 4) | status->nss;
579 if (status->enc_flags & RX_ENC_FLAG_LDPC)
580 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
588 if (local->hw.radiotap_timestamp.units_pos >= 0) {
590 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
593 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
595 /* ensure 8 byte alignment */
596 while ((pos - (u8 *)rthdr) & 7)
599 put_unaligned_le64(status->device_timestamp, pos);
602 if (local->hw.radiotap_timestamp.accuracy >= 0) {
603 accuracy = local->hw.radiotap_timestamp.accuracy;
604 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
606 put_unaligned_le16(accuracy, pos);
609 *pos++ = local->hw.radiotap_timestamp.units_pos;
613 if (status->encoding == RX_ENC_HE &&
614 status->flag & RX_FLAG_RADIOTAP_HE) {
615 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
617 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
618 he.data6 |= HE_PREP(DATA6_NSTS,
619 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
621 he.data3 |= HE_PREP(DATA3_STBC, 1);
623 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
626 #define CHECK_GI(s) \
627 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
628 (int)NL80211_RATE_INFO_HE_GI_##s)
634 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
635 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
636 he.data3 |= HE_PREP(DATA3_CODING,
637 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
639 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
641 switch (status->bw) {
642 case RATE_INFO_BW_20:
643 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
644 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
646 case RATE_INFO_BW_40:
647 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
648 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
650 case RATE_INFO_BW_80:
651 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
652 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
654 case RATE_INFO_BW_160:
655 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
656 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
658 case RATE_INFO_BW_HE_RU:
659 #define CHECK_RU_ALLOC(s) \
660 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
661 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
669 CHECK_RU_ALLOC(2x996);
671 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
675 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
678 /* ensure 2 byte alignment */
679 while ((pos - (u8 *)rthdr) & 1)
681 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
682 memcpy(pos, &he, sizeof(he));
686 if (status->encoding == RX_ENC_HE &&
687 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
688 /* ensure 2 byte alignment */
689 while ((pos - (u8 *)rthdr) & 1)
691 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
692 memcpy(pos, &he_mu, sizeof(he_mu));
693 pos += sizeof(he_mu);
696 if (status->flag & RX_FLAG_NO_PSDU) {
698 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
699 *pos++ = status->zero_length_psdu_type;
702 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
703 /* ensure 2 byte alignment */
704 while ((pos - (u8 *)rthdr) & 1)
706 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
707 memcpy(pos, &lsig, sizeof(lsig));
711 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
712 *pos++ = status->chain_signal[chain];
716 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
717 /* ensure 2 byte alignment for the vendor field as required */
718 if ((pos - (u8 *)rthdr) & 1)
720 *pos++ = rtap.oui[0];
721 *pos++ = rtap.oui[1];
722 *pos++ = rtap.oui[2];
724 put_unaligned_le16(rtap.len, pos);
726 /* align the actual payload as requested */
727 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
729 /* data (and possible padding) already follows */
733 static struct sk_buff *
734 ieee80211_make_monitor_skb(struct ieee80211_local *local,
735 struct sk_buff **origskb,
736 struct ieee80211_rate *rate,
737 int rtap_space, bool use_origskb)
739 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
740 int rt_hdrlen, needed_headroom;
743 /* room for the radiotap header based on driver features */
744 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
745 needed_headroom = rt_hdrlen - rtap_space;
748 /* only need to expand headroom if necessary */
753 * This shouldn't trigger often because most devices have an
754 * RX header they pull before we get here, and that should
755 * be big enough for our radiotap information. We should
756 * probably export the length to drivers so that we can have
757 * them allocate enough headroom to start with.
759 if (skb_headroom(skb) < needed_headroom &&
760 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
766 * Need to make a copy and possibly remove radiotap header
767 * and FCS from the original.
769 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
775 /* prepend radiotap information */
776 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
778 skb_reset_mac_header(skb);
779 skb->ip_summed = CHECKSUM_UNNECESSARY;
780 skb->pkt_type = PACKET_OTHERHOST;
781 skb->protocol = htons(ETH_P_802_2);
787 * This function copies a received frame to all monitor interfaces and
788 * returns a cleaned-up SKB that no longer includes the FCS nor the
789 * radiotap header the driver might have added.
791 static struct sk_buff *
792 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
793 struct ieee80211_rate *rate)
795 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
796 struct ieee80211_sub_if_data *sdata;
797 struct sk_buff *monskb = NULL;
798 int present_fcs_len = 0;
799 unsigned int rtap_space = 0;
800 struct ieee80211_sub_if_data *monitor_sdata =
801 rcu_dereference(local->monitor_sdata);
802 bool only_monitor = false;
803 unsigned int min_head_len;
805 if (status->flag & RX_FLAG_RADIOTAP_HE)
806 rtap_space += sizeof(struct ieee80211_radiotap_he);
808 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
809 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
811 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
812 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
814 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
815 struct ieee80211_vendor_radiotap *rtap =
816 (void *)(origskb->data + rtap_space);
818 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
821 min_head_len = rtap_space;
824 * First, we may need to make a copy of the skb because
825 * (1) we need to modify it for radiotap (if not present), and
826 * (2) the other RX handlers will modify the skb we got.
828 * We don't need to, of course, if we aren't going to return
829 * the SKB because it has a bad FCS/PLCP checksum.
832 if (!(status->flag & RX_FLAG_NO_PSDU)) {
833 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
834 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
837 dev_kfree_skb(origskb);
840 present_fcs_len = FCS_LEN;
843 /* also consider the hdr->frame_control */
847 /* ensure that the expected data elements are in skb head */
848 if (!pskb_may_pull(origskb, min_head_len)) {
849 dev_kfree_skb(origskb);
853 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
855 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
857 dev_kfree_skb(origskb);
861 return ieee80211_clean_skb(origskb, present_fcs_len,
865 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
867 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
868 bool last_monitor = list_is_last(&sdata->u.mntr.list,
872 monskb = ieee80211_make_monitor_skb(local, &origskb,
884 skb = skb_clone(monskb, GFP_ATOMIC);
888 skb->dev = sdata->dev;
889 ieee80211_rx_stats(skb->dev, skb->len);
890 netif_receive_skb(skb);
898 /* this happens if last_monitor was erroneously false */
899 dev_kfree_skb(monskb);
905 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
908 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
910 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
911 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
912 int tid, seqno_idx, security_idx;
914 /* does the frame have a qos control field? */
915 if (ieee80211_is_data_qos(hdr->frame_control)) {
916 u8 *qc = ieee80211_get_qos_ctl(hdr);
917 /* frame has qos control */
918 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
919 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
920 status->rx_flags |= IEEE80211_RX_AMSDU;
926 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
928 * Sequence numbers for management frames, QoS data
929 * frames with a broadcast/multicast address in the
930 * Address 1 field, and all non-QoS data frames sent
931 * by QoS STAs are assigned using an additional single
932 * modulo-4096 counter, [...]
934 * We also use that counter for non-QoS STAs.
936 seqno_idx = IEEE80211_NUM_TIDS;
938 if (ieee80211_is_mgmt(hdr->frame_control))
939 security_idx = IEEE80211_NUM_TIDS;
943 rx->seqno_idx = seqno_idx;
944 rx->security_idx = security_idx;
945 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
946 * For now, set skb->priority to 0 for other cases. */
947 rx->skb->priority = (tid > 7) ? 0 : tid;
951 * DOC: Packet alignment
953 * Drivers always need to pass packets that are aligned to two-byte boundaries
956 * Additionally, should, if possible, align the payload data in a way that
957 * guarantees that the contained IP header is aligned to a four-byte
958 * boundary. In the case of regular frames, this simply means aligning the
959 * payload to a four-byte boundary (because either the IP header is directly
960 * contained, or IV/RFC1042 headers that have a length divisible by four are
961 * in front of it). If the payload data is not properly aligned and the
962 * architecture doesn't support efficient unaligned operations, mac80211
963 * will align the data.
965 * With A-MSDU frames, however, the payload data address must yield two modulo
966 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
967 * push the IP header further back to a multiple of four again. Thankfully, the
968 * specs were sane enough this time around to require padding each A-MSDU
969 * subframe to a length that is a multiple of four.
971 * Padding like Atheros hardware adds which is between the 802.11 header and
972 * the payload is not supported, the driver is required to move the 802.11
973 * header to be directly in front of the payload in that case.
975 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
977 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
978 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
985 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
987 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
989 if (is_multicast_ether_addr(hdr->addr1))
992 return ieee80211_is_robust_mgmt_frame(skb);
996 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
998 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1000 if (!is_multicast_ether_addr(hdr->addr1))
1003 return ieee80211_is_robust_mgmt_frame(skb);
1007 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
1008 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
1010 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
1011 struct ieee80211_mmie *mmie;
1012 struct ieee80211_mmie_16 *mmie16;
1014 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
1017 if (!ieee80211_is_robust_mgmt_frame(skb) &&
1018 !ieee80211_is_beacon(hdr->frame_control))
1019 return -1; /* not a robust management frame */
1021 mmie = (struct ieee80211_mmie *)
1022 (skb->data + skb->len - sizeof(*mmie));
1023 if (mmie->element_id == WLAN_EID_MMIE &&
1024 mmie->length == sizeof(*mmie) - 2)
1025 return le16_to_cpu(mmie->key_id);
1027 mmie16 = (struct ieee80211_mmie_16 *)
1028 (skb->data + skb->len - sizeof(*mmie16));
1029 if (skb->len >= 24 + sizeof(*mmie16) &&
1030 mmie16->element_id == WLAN_EID_MMIE &&
1031 mmie16->length == sizeof(*mmie16) - 2)
1032 return le16_to_cpu(mmie16->key_id);
1037 static int ieee80211_get_keyid(struct sk_buff *skb,
1038 const struct ieee80211_cipher_scheme *cs)
1040 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1048 fc = hdr->frame_control;
1049 hdrlen = ieee80211_hdrlen(fc);
1052 minlen = hdrlen + cs->hdr_len;
1053 key_idx_off = hdrlen + cs->key_idx_off;
1054 key_idx_shift = cs->key_idx_shift;
1056 /* WEP, TKIP, CCMP and GCMP */
1057 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1058 key_idx_off = hdrlen + 3;
1062 if (unlikely(skb->len < minlen))
1065 skb_copy_bits(skb, key_idx_off, &keyid, 1);
1068 keyid &= cs->key_idx_mask;
1069 keyid >>= key_idx_shift;
1071 /* cs could use more than the usual two bits for the keyid */
1072 if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1078 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1080 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1081 char *dev_addr = rx->sdata->vif.addr;
1083 if (ieee80211_is_data(hdr->frame_control)) {
1084 if (is_multicast_ether_addr(hdr->addr1)) {
1085 if (ieee80211_has_tods(hdr->frame_control) ||
1086 !ieee80211_has_fromds(hdr->frame_control))
1087 return RX_DROP_MONITOR;
1088 if (ether_addr_equal(hdr->addr3, dev_addr))
1089 return RX_DROP_MONITOR;
1091 if (!ieee80211_has_a4(hdr->frame_control))
1092 return RX_DROP_MONITOR;
1093 if (ether_addr_equal(hdr->addr4, dev_addr))
1094 return RX_DROP_MONITOR;
1098 /* If there is not an established peer link and this is not a peer link
1099 * establisment frame, beacon or probe, drop the frame.
1102 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1103 struct ieee80211_mgmt *mgmt;
1105 if (!ieee80211_is_mgmt(hdr->frame_control))
1106 return RX_DROP_MONITOR;
1108 if (ieee80211_is_action(hdr->frame_control)) {
1111 /* make sure category field is present */
1112 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1113 return RX_DROP_MONITOR;
1115 mgmt = (struct ieee80211_mgmt *)hdr;
1116 category = mgmt->u.action.category;
1117 if (category != WLAN_CATEGORY_MESH_ACTION &&
1118 category != WLAN_CATEGORY_SELF_PROTECTED)
1119 return RX_DROP_MONITOR;
1123 if (ieee80211_is_probe_req(hdr->frame_control) ||
1124 ieee80211_is_probe_resp(hdr->frame_control) ||
1125 ieee80211_is_beacon(hdr->frame_control) ||
1126 ieee80211_is_auth(hdr->frame_control))
1129 return RX_DROP_MONITOR;
1135 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1138 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1139 struct sk_buff *tail = skb_peek_tail(frames);
1140 struct ieee80211_rx_status *status;
1142 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1148 status = IEEE80211_SKB_RXCB(tail);
1149 if (status->flag & RX_FLAG_AMSDU_MORE)
1155 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1156 struct tid_ampdu_rx *tid_agg_rx,
1158 struct sk_buff_head *frames)
1160 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1161 struct sk_buff *skb;
1162 struct ieee80211_rx_status *status;
1164 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1166 if (skb_queue_empty(skb_list))
1169 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1170 __skb_queue_purge(skb_list);
1174 /* release frames from the reorder ring buffer */
1175 tid_agg_rx->stored_mpdu_num--;
1176 while ((skb = __skb_dequeue(skb_list))) {
1177 status = IEEE80211_SKB_RXCB(skb);
1178 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1179 __skb_queue_tail(frames, skb);
1183 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1184 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1187 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1188 struct tid_ampdu_rx *tid_agg_rx,
1190 struct sk_buff_head *frames)
1194 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1196 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1197 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1198 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1204 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1205 * the skb was added to the buffer longer than this time ago, the earlier
1206 * frames that have not yet been received are assumed to be lost and the skb
1207 * can be released for processing. This may also release other skb's from the
1208 * reorder buffer if there are no additional gaps between the frames.
1210 * Callers must hold tid_agg_rx->reorder_lock.
1212 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1214 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1215 struct tid_ampdu_rx *tid_agg_rx,
1216 struct sk_buff_head *frames)
1220 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1222 /* release the buffer until next missing frame */
1223 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1224 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1225 tid_agg_rx->stored_mpdu_num) {
1227 * No buffers ready to be released, but check whether any
1228 * frames in the reorder buffer have timed out.
1231 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1232 j = (j + 1) % tid_agg_rx->buf_size) {
1233 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1238 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1239 HT_RX_REORDER_BUF_TIMEOUT))
1240 goto set_release_timer;
1242 /* don't leave incomplete A-MSDUs around */
1243 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1244 i = (i + 1) % tid_agg_rx->buf_size)
1245 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1247 ht_dbg_ratelimited(sdata,
1248 "release an RX reorder frame due to timeout on earlier frames\n");
1249 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1253 * Increment the head seq# also for the skipped slots.
1255 tid_agg_rx->head_seq_num =
1256 (tid_agg_rx->head_seq_num +
1257 skipped) & IEEE80211_SN_MASK;
1260 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1261 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1263 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1266 if (tid_agg_rx->stored_mpdu_num) {
1267 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1269 for (; j != (index - 1) % tid_agg_rx->buf_size;
1270 j = (j + 1) % tid_agg_rx->buf_size) {
1271 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1277 if (!tid_agg_rx->removed)
1278 mod_timer(&tid_agg_rx->reorder_timer,
1279 tid_agg_rx->reorder_time[j] + 1 +
1280 HT_RX_REORDER_BUF_TIMEOUT);
1282 del_timer(&tid_agg_rx->reorder_timer);
1287 * As this function belongs to the RX path it must be under
1288 * rcu_read_lock protection. It returns false if the frame
1289 * can be processed immediately, true if it was consumed.
1291 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1292 struct tid_ampdu_rx *tid_agg_rx,
1293 struct sk_buff *skb,
1294 struct sk_buff_head *frames)
1296 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1297 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1298 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1299 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1300 u16 head_seq_num, buf_size;
1304 spin_lock(&tid_agg_rx->reorder_lock);
1307 * Offloaded BA sessions have no known starting sequence number so pick
1308 * one from first Rxed frame for this tid after BA was started.
1310 if (unlikely(tid_agg_rx->auto_seq)) {
1311 tid_agg_rx->auto_seq = false;
1312 tid_agg_rx->ssn = mpdu_seq_num;
1313 tid_agg_rx->head_seq_num = mpdu_seq_num;
1316 buf_size = tid_agg_rx->buf_size;
1317 head_seq_num = tid_agg_rx->head_seq_num;
1320 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1323 if (unlikely(!tid_agg_rx->started)) {
1324 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1328 tid_agg_rx->started = true;
1331 /* frame with out of date sequence number */
1332 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1338 * If frame the sequence number exceeds our buffering window
1339 * size release some previous frames to make room for this one.
1341 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1342 head_seq_num = ieee80211_sn_inc(
1343 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1344 /* release stored frames up to new head to stack */
1345 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1346 head_seq_num, frames);
1349 /* Now the new frame is always in the range of the reordering buffer */
1351 index = mpdu_seq_num % tid_agg_rx->buf_size;
1353 /* check if we already stored this frame */
1354 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1360 * If the current MPDU is in the right order and nothing else
1361 * is stored we can process it directly, no need to buffer it.
1362 * If it is first but there's something stored, we may be able
1363 * to release frames after this one.
1365 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1366 tid_agg_rx->stored_mpdu_num == 0) {
1367 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1368 tid_agg_rx->head_seq_num =
1369 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1374 /* put the frame in the reordering buffer */
1375 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1376 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1377 tid_agg_rx->reorder_time[index] = jiffies;
1378 tid_agg_rx->stored_mpdu_num++;
1379 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1383 spin_unlock(&tid_agg_rx->reorder_lock);
1388 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1389 * true if the MPDU was buffered, false if it should be processed.
1391 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1392 struct sk_buff_head *frames)
1394 struct sk_buff *skb = rx->skb;
1395 struct ieee80211_local *local = rx->local;
1396 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1397 struct sta_info *sta = rx->sta;
1398 struct tid_ampdu_rx *tid_agg_rx;
1402 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1403 is_multicast_ether_addr(hdr->addr1))
1407 * filter the QoS data rx stream according to
1408 * STA/TID and check if this STA/TID is on aggregation
1414 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1415 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1416 tid = ieee80211_get_tid(hdr);
1418 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1420 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1421 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1422 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1423 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1424 WLAN_BACK_RECIPIENT,
1425 WLAN_REASON_QSTA_REQUIRE_SETUP);
1429 /* qos null data frames are excluded */
1430 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1433 /* not part of a BA session */
1434 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1435 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1438 /* new, potentially un-ordered, ampdu frame - process it */
1440 /* reset session timer */
1441 if (tid_agg_rx->timeout)
1442 tid_agg_rx->last_rx = jiffies;
1444 /* if this mpdu is fragmented - terminate rx aggregation session */
1445 sc = le16_to_cpu(hdr->seq_ctrl);
1446 if (sc & IEEE80211_SCTL_FRAG) {
1447 skb_queue_tail(&rx->sdata->skb_queue, skb);
1448 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1453 * No locking needed -- we will only ever process one
1454 * RX packet at a time, and thus own tid_agg_rx. All
1455 * other code manipulating it needs to (and does) make
1456 * sure that we cannot get to it any more before doing
1459 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1464 __skb_queue_tail(frames, skb);
1467 static ieee80211_rx_result debug_noinline
1468 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1470 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1471 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1473 if (status->flag & RX_FLAG_DUP_VALIDATED)
1477 * Drop duplicate 802.11 retransmissions
1478 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1481 if (rx->skb->len < 24)
1484 if (ieee80211_is_ctl(hdr->frame_control) ||
1485 ieee80211_is_any_nullfunc(hdr->frame_control) ||
1486 is_multicast_ether_addr(hdr->addr1))
1492 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1493 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1494 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1495 rx->sta->rx_stats.num_duplicates++;
1496 return RX_DROP_UNUSABLE;
1497 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1498 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1504 static ieee80211_rx_result debug_noinline
1505 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1507 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1509 /* Drop disallowed frame classes based on STA auth/assoc state;
1510 * IEEE 802.11, Chap 5.5.
1512 * mac80211 filters only based on association state, i.e. it drops
1513 * Class 3 frames from not associated stations. hostapd sends
1514 * deauth/disassoc frames when needed. In addition, hostapd is
1515 * responsible for filtering on both auth and assoc states.
1518 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1519 return ieee80211_rx_mesh_check(rx);
1521 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1522 ieee80211_is_pspoll(hdr->frame_control)) &&
1523 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1524 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1525 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1526 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1528 * accept port control frames from the AP even when it's not
1529 * yet marked ASSOC to prevent a race where we don't set the
1530 * assoc bit quickly enough before it sends the first frame
1532 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1533 ieee80211_is_data_present(hdr->frame_control)) {
1534 unsigned int hdrlen;
1537 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1539 if (rx->skb->len < hdrlen + 8)
1540 return RX_DROP_MONITOR;
1542 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1543 if (ethertype == rx->sdata->control_port_protocol)
1547 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1548 cfg80211_rx_spurious_frame(rx->sdata->dev,
1551 return RX_DROP_UNUSABLE;
1553 return RX_DROP_MONITOR;
1560 static ieee80211_rx_result debug_noinline
1561 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1563 struct ieee80211_local *local;
1564 struct ieee80211_hdr *hdr;
1565 struct sk_buff *skb;
1569 hdr = (struct ieee80211_hdr *) skb->data;
1571 if (!local->pspolling)
1574 if (!ieee80211_has_fromds(hdr->frame_control))
1575 /* this is not from AP */
1578 if (!ieee80211_is_data(hdr->frame_control))
1581 if (!ieee80211_has_moredata(hdr->frame_control)) {
1582 /* AP has no more frames buffered for us */
1583 local->pspolling = false;
1587 /* more data bit is set, let's request a new frame from the AP */
1588 ieee80211_send_pspoll(local, rx->sdata);
1593 static void sta_ps_start(struct sta_info *sta)
1595 struct ieee80211_sub_if_data *sdata = sta->sdata;
1596 struct ieee80211_local *local = sdata->local;
1600 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1601 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1602 ps = &sdata->bss->ps;
1606 atomic_inc(&ps->num_sta_ps);
1607 set_sta_flag(sta, WLAN_STA_PS_STA);
1608 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1609 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1610 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1611 sta->sta.addr, sta->sta.aid);
1613 ieee80211_clear_fast_xmit(sta);
1615 if (!sta->sta.txq[0])
1618 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1619 struct ieee80211_txq *txq = sta->sta.txq[tid];
1620 struct txq_info *txqi = to_txq_info(txq);
1622 spin_lock(&local->active_txq_lock[txq->ac]);
1623 if (!list_empty(&txqi->schedule_order))
1624 list_del_init(&txqi->schedule_order);
1625 spin_unlock(&local->active_txq_lock[txq->ac]);
1627 if (txq_has_queue(txq))
1628 set_bit(tid, &sta->txq_buffered_tids);
1630 clear_bit(tid, &sta->txq_buffered_tids);
1634 static void sta_ps_end(struct sta_info *sta)
1636 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1637 sta->sta.addr, sta->sta.aid);
1639 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1641 * Clear the flag only if the other one is still set
1642 * so that the TX path won't start TX'ing new frames
1643 * directly ... In the case that the driver flag isn't
1644 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1646 clear_sta_flag(sta, WLAN_STA_PS_STA);
1647 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1648 sta->sta.addr, sta->sta.aid);
1652 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1653 clear_sta_flag(sta, WLAN_STA_PS_STA);
1654 ieee80211_sta_ps_deliver_wakeup(sta);
1657 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1659 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1662 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1664 /* Don't let the same PS state be set twice */
1665 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1666 if ((start && in_ps) || (!start && !in_ps))
1676 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1678 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1680 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1682 if (test_sta_flag(sta, WLAN_STA_SP))
1685 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1686 ieee80211_sta_ps_deliver_poll_response(sta);
1688 set_sta_flag(sta, WLAN_STA_PSPOLL);
1690 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1692 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1694 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1695 int ac = ieee80211_ac_from_tid(tid);
1698 * If this AC is not trigger-enabled do nothing unless the
1699 * driver is calling us after it already checked.
1701 * NB: This could/should check a separate bitmap of trigger-
1702 * enabled queues, but for now we only implement uAPSD w/o
1703 * TSPEC changes to the ACs, so they're always the same.
1705 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1706 tid != IEEE80211_NUM_TIDS)
1709 /* if we are in a service period, do nothing */
1710 if (test_sta_flag(sta, WLAN_STA_SP))
1713 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1714 ieee80211_sta_ps_deliver_uapsd(sta);
1716 set_sta_flag(sta, WLAN_STA_UAPSD);
1718 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1720 static ieee80211_rx_result debug_noinline
1721 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1723 struct ieee80211_sub_if_data *sdata = rx->sdata;
1724 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1725 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1730 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1731 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1735 * The device handles station powersave, so don't do anything about
1736 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1737 * it to mac80211 since they're handled.)
1739 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1743 * Don't do anything if the station isn't already asleep. In
1744 * the uAPSD case, the station will probably be marked asleep,
1745 * in the PS-Poll case the station must be confused ...
1747 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1750 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1751 ieee80211_sta_pspoll(&rx->sta->sta);
1753 /* Free PS Poll skb here instead of returning RX_DROP that would
1754 * count as an dropped frame. */
1755 dev_kfree_skb(rx->skb);
1758 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1759 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1760 ieee80211_has_pm(hdr->frame_control) &&
1761 (ieee80211_is_data_qos(hdr->frame_control) ||
1762 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1763 u8 tid = ieee80211_get_tid(hdr);
1765 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1771 static ieee80211_rx_result debug_noinline
1772 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1774 struct sta_info *sta = rx->sta;
1775 struct sk_buff *skb = rx->skb;
1776 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1777 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1784 * Update last_rx only for IBSS packets which are for the current
1785 * BSSID and for station already AUTHORIZED to avoid keeping the
1786 * current IBSS network alive in cases where other STAs start
1787 * using different BSSID. This will also give the station another
1788 * chance to restart the authentication/authorization in case
1789 * something went wrong the first time.
1791 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1792 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1793 NL80211_IFTYPE_ADHOC);
1794 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1795 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1796 sta->rx_stats.last_rx = jiffies;
1797 if (ieee80211_is_data(hdr->frame_control) &&
1798 !is_multicast_ether_addr(hdr->addr1))
1799 sta->rx_stats.last_rate =
1800 sta_stats_encode_rate(status);
1802 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1803 sta->rx_stats.last_rx = jiffies;
1804 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1806 * Mesh beacons will update last_rx when if they are found to
1807 * match the current local configuration when processed.
1809 sta->rx_stats.last_rx = jiffies;
1810 if (ieee80211_is_data(hdr->frame_control))
1811 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1814 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1815 ieee80211_sta_rx_notify(rx->sdata, hdr);
1817 sta->rx_stats.fragments++;
1819 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1820 sta->rx_stats.bytes += rx->skb->len;
1821 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1823 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1824 sta->rx_stats.last_signal = status->signal;
1825 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1828 if (status->chains) {
1829 sta->rx_stats.chains = status->chains;
1830 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1831 int signal = status->chain_signal[i];
1833 if (!(status->chains & BIT(i)))
1836 sta->rx_stats.chain_signal_last[i] = signal;
1837 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1843 * Change STA power saving mode only at the end of a frame
1844 * exchange sequence, and only for a data or management
1845 * frame as specified in IEEE 802.11-2016 11.2.3.2
1847 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1848 !ieee80211_has_morefrags(hdr->frame_control) &&
1849 !is_multicast_ether_addr(hdr->addr1) &&
1850 (ieee80211_is_mgmt(hdr->frame_control) ||
1851 ieee80211_is_data(hdr->frame_control)) &&
1852 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1853 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1854 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1855 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1856 if (!ieee80211_has_pm(hdr->frame_control))
1859 if (ieee80211_has_pm(hdr->frame_control))
1864 /* mesh power save support */
1865 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1866 ieee80211_mps_rx_h_sta_process(sta, hdr);
1869 * Drop (qos-)data::nullfunc frames silently, since they
1870 * are used only to control station power saving mode.
1872 if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1873 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1876 * If we receive a 4-addr nullfunc frame from a STA
1877 * that was not moved to a 4-addr STA vlan yet send
1878 * the event to userspace and for older hostapd drop
1879 * the frame to the monitor interface.
1881 if (ieee80211_has_a4(hdr->frame_control) &&
1882 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1883 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1884 !rx->sdata->u.vlan.sta))) {
1885 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1886 cfg80211_rx_unexpected_4addr_frame(
1887 rx->sdata->dev, sta->sta.addr,
1889 return RX_DROP_MONITOR;
1892 * Update counter and free packet here to avoid
1893 * counting this as a dropped packed.
1895 sta->rx_stats.packets++;
1896 dev_kfree_skb(rx->skb);
1901 } /* ieee80211_rx_h_sta_process */
1903 static struct ieee80211_key *
1904 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1906 struct ieee80211_key *key = NULL;
1907 struct ieee80211_sub_if_data *sdata = rx->sdata;
1910 /* Make sure key gets set if either BIGTK key index is set so that
1911 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1912 * Beacon frames and Beacon frames that claim to use another BIGTK key
1913 * index (i.e., a key that we do not have).
1917 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1920 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1927 key = rcu_dereference(rx->sta->gtk[idx]);
1929 key = rcu_dereference(sdata->keys[idx]);
1930 if (!key && rx->sta)
1931 key = rcu_dereference(rx->sta->gtk[idx2]);
1933 key = rcu_dereference(sdata->keys[idx2]);
1938 static ieee80211_rx_result debug_noinline
1939 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1941 struct sk_buff *skb = rx->skb;
1942 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1945 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1946 struct ieee80211_key *sta_ptk = NULL;
1947 struct ieee80211_key *ptk_idx = NULL;
1948 int mmie_keyidx = -1;
1950 const struct ieee80211_cipher_scheme *cs = NULL;
1955 * There are five types of keys:
1956 * - GTK (group keys)
1957 * - IGTK (group keys for management frames)
1958 * - BIGTK (group keys for Beacon frames)
1959 * - PTK (pairwise keys)
1960 * - STK (station-to-station pairwise keys)
1962 * When selecting a key, we have to distinguish between multicast
1963 * (including broadcast) and unicast frames, the latter can only
1964 * use PTKs and STKs while the former always use GTKs, IGTKs, and
1965 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1966 * then unicast frames can also use key indices like GTKs. Hence, if we
1967 * don't have a PTK/STK we check the key index for a WEP key.
1969 * Note that in a regular BSS, multicast frames are sent by the
1970 * AP only, associated stations unicast the frame to the AP first
1971 * which then multicasts it on their behalf.
1973 * There is also a slight problem in IBSS mode: GTKs are negotiated
1974 * with each station, that is something we don't currently handle.
1975 * The spec seems to expect that one negotiates the same key with
1976 * every station but there's no such requirement; VLANs could be
1980 /* start without a key */
1982 fc = hdr->frame_control;
1985 int keyid = rx->sta->ptk_idx;
1986 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1988 if (ieee80211_has_protected(fc)) {
1989 cs = rx->sta->cipher_scheme;
1990 keyid = ieee80211_get_keyid(rx->skb, cs);
1992 if (unlikely(keyid < 0))
1993 return RX_DROP_UNUSABLE;
1995 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1999 if (!ieee80211_has_protected(fc))
2000 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
2002 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
2003 rx->key = ptk_idx ? ptk_idx : sta_ptk;
2004 if ((status->flag & RX_FLAG_DECRYPTED) &&
2005 (status->flag & RX_FLAG_IV_STRIPPED))
2007 /* Skip decryption if the frame is not protected. */
2008 if (!ieee80211_has_protected(fc))
2010 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
2011 /* Broadcast/multicast robust management frame / BIP */
2012 if ((status->flag & RX_FLAG_DECRYPTED) &&
2013 (status->flag & RX_FLAG_IV_STRIPPED))
2016 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
2017 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
2018 NUM_DEFAULT_BEACON_KEYS) {
2019 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2022 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
2025 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
2027 return RX_CONTINUE; /* Beacon protection not in use */
2028 } else if (mmie_keyidx >= 0) {
2029 /* Broadcast/multicast robust management frame / BIP */
2030 if ((status->flag & RX_FLAG_DECRYPTED) &&
2031 (status->flag & RX_FLAG_IV_STRIPPED))
2034 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2035 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2036 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
2038 if (ieee80211_is_group_privacy_action(skb) &&
2039 test_sta_flag(rx->sta, WLAN_STA_MFP))
2040 return RX_DROP_MONITOR;
2042 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
2045 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
2046 } else if (!ieee80211_has_protected(fc)) {
2048 * The frame was not protected, so skip decryption. However, we
2049 * need to set rx->key if there is a key that could have been
2050 * used so that the frame may be dropped if encryption would
2051 * have been expected.
2053 struct ieee80211_key *key = NULL;
2054 struct ieee80211_sub_if_data *sdata = rx->sdata;
2057 if (ieee80211_is_beacon(fc)) {
2058 key = ieee80211_rx_get_bigtk(rx, -1);
2059 } else if (ieee80211_is_mgmt(fc) &&
2060 is_multicast_ether_addr(hdr->addr1)) {
2061 key = rcu_dereference(rx->sdata->default_mgmt_key);
2064 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2065 key = rcu_dereference(rx->sta->gtk[i]);
2071 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2072 key = rcu_dereference(sdata->keys[i]);
2083 * The device doesn't give us the IV so we won't be
2084 * able to look up the key. That's ok though, we
2085 * don't need to decrypt the frame, we just won't
2086 * be able to keep statistics accurate.
2087 * Except for key threshold notifications, should
2088 * we somehow allow the driver to tell us which key
2089 * the hardware used if this flag is set?
2091 if ((status->flag & RX_FLAG_DECRYPTED) &&
2092 (status->flag & RX_FLAG_IV_STRIPPED))
2095 keyidx = ieee80211_get_keyid(rx->skb, cs);
2097 if (unlikely(keyidx < 0))
2098 return RX_DROP_UNUSABLE;
2100 /* check per-station GTK first, if multicast packet */
2101 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2102 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2104 /* if not found, try default key */
2106 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2109 * RSNA-protected unicast frames should always be
2110 * sent with pairwise or station-to-station keys,
2111 * but for WEP we allow using a key index as well.
2114 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2115 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2116 !is_multicast_ether_addr(hdr->addr1))
2122 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2123 return RX_DROP_MONITOR;
2125 /* TODO: add threshold stuff again */
2127 return RX_DROP_MONITOR;
2130 switch (rx->key->conf.cipher) {
2131 case WLAN_CIPHER_SUITE_WEP40:
2132 case WLAN_CIPHER_SUITE_WEP104:
2133 result = ieee80211_crypto_wep_decrypt(rx);
2135 case WLAN_CIPHER_SUITE_TKIP:
2136 result = ieee80211_crypto_tkip_decrypt(rx);
2138 case WLAN_CIPHER_SUITE_CCMP:
2139 result = ieee80211_crypto_ccmp_decrypt(
2140 rx, IEEE80211_CCMP_MIC_LEN);
2142 case WLAN_CIPHER_SUITE_CCMP_256:
2143 result = ieee80211_crypto_ccmp_decrypt(
2144 rx, IEEE80211_CCMP_256_MIC_LEN);
2146 case WLAN_CIPHER_SUITE_AES_CMAC:
2147 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2149 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2150 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2152 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2153 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2154 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2156 case WLAN_CIPHER_SUITE_GCMP:
2157 case WLAN_CIPHER_SUITE_GCMP_256:
2158 result = ieee80211_crypto_gcmp_decrypt(rx);
2161 result = ieee80211_crypto_hw_decrypt(rx);
2164 /* the hdr variable is invalid after the decrypt handlers */
2166 /* either the frame has been decrypted or will be dropped */
2167 status->flag |= RX_FLAG_DECRYPTED;
2169 if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
2170 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2171 skb->data, skb->len);
2176 static inline struct ieee80211_fragment_entry *
2177 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2178 unsigned int frag, unsigned int seq, int rx_queue,
2179 struct sk_buff **skb)
2181 struct ieee80211_fragment_entry *entry;
2183 entry = &sdata->fragments[sdata->fragment_next++];
2184 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2185 sdata->fragment_next = 0;
2187 if (!skb_queue_empty(&entry->skb_list))
2188 __skb_queue_purge(&entry->skb_list);
2190 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2192 entry->first_frag_time = jiffies;
2194 entry->rx_queue = rx_queue;
2195 entry->last_frag = frag;
2196 entry->check_sequential_pn = false;
2197 entry->extra_len = 0;
2202 static inline struct ieee80211_fragment_entry *
2203 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2204 unsigned int frag, unsigned int seq,
2205 int rx_queue, struct ieee80211_hdr *hdr)
2207 struct ieee80211_fragment_entry *entry;
2210 idx = sdata->fragment_next;
2211 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2212 struct ieee80211_hdr *f_hdr;
2213 struct sk_buff *f_skb;
2217 idx = IEEE80211_FRAGMENT_MAX - 1;
2219 entry = &sdata->fragments[idx];
2220 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2221 entry->rx_queue != rx_queue ||
2222 entry->last_frag + 1 != frag)
2225 f_skb = __skb_peek(&entry->skb_list);
2226 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2229 * Check ftype and addresses are equal, else check next fragment
2231 if (((hdr->frame_control ^ f_hdr->frame_control) &
2232 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2233 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2234 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2237 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2238 __skb_queue_purge(&entry->skb_list);
2247 static ieee80211_rx_result debug_noinline
2248 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2250 struct ieee80211_hdr *hdr;
2253 unsigned int frag, seq;
2254 struct ieee80211_fragment_entry *entry;
2255 struct sk_buff *skb;
2257 hdr = (struct ieee80211_hdr *)rx->skb->data;
2258 fc = hdr->frame_control;
2260 if (ieee80211_is_ctl(fc))
2263 sc = le16_to_cpu(hdr->seq_ctrl);
2264 frag = sc & IEEE80211_SCTL_FRAG;
2266 if (is_multicast_ether_addr(hdr->addr1)) {
2267 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2271 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2274 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2276 if (skb_linearize(rx->skb))
2277 return RX_DROP_UNUSABLE;
2280 * skb_linearize() might change the skb->data and
2281 * previously cached variables (in this case, hdr) need to
2282 * be refreshed with the new data.
2284 hdr = (struct ieee80211_hdr *)rx->skb->data;
2285 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2288 /* This is the first fragment of a new frame. */
2289 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2290 rx->seqno_idx, &(rx->skb));
2292 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2293 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2294 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2295 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2296 ieee80211_has_protected(fc)) {
2297 int queue = rx->security_idx;
2299 /* Store CCMP/GCMP PN so that we can verify that the
2300 * next fragment has a sequential PN value.
2302 entry->check_sequential_pn = true;
2303 memcpy(entry->last_pn,
2304 rx->key->u.ccmp.rx_pn[queue],
2305 IEEE80211_CCMP_PN_LEN);
2306 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2308 offsetof(struct ieee80211_key,
2310 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2311 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2312 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2313 IEEE80211_GCMP_PN_LEN);
2318 /* This is a fragment for a frame that should already be pending in
2319 * fragment cache. Add this fragment to the end of the pending entry.
2321 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2322 rx->seqno_idx, hdr);
2324 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2325 return RX_DROP_MONITOR;
2328 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2329 * MPDU PN values are not incrementing in steps of 1."
2330 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2331 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2333 if (entry->check_sequential_pn) {
2335 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2339 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2340 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2341 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2342 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2343 return RX_DROP_UNUSABLE;
2344 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2345 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2350 queue = rx->security_idx;
2351 rpn = rx->key->u.ccmp.rx_pn[queue];
2352 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2353 return RX_DROP_UNUSABLE;
2354 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2357 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2358 __skb_queue_tail(&entry->skb_list, rx->skb);
2359 entry->last_frag = frag;
2360 entry->extra_len += rx->skb->len;
2361 if (ieee80211_has_morefrags(fc)) {
2366 rx->skb = __skb_dequeue(&entry->skb_list);
2367 if (skb_tailroom(rx->skb) < entry->extra_len) {
2368 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2369 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2371 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2372 __skb_queue_purge(&entry->skb_list);
2373 return RX_DROP_UNUSABLE;
2376 while ((skb = __skb_dequeue(&entry->skb_list))) {
2377 skb_put_data(rx->skb, skb->data, skb->len);
2382 ieee80211_led_rx(rx->local);
2385 rx->sta->rx_stats.packets++;
2389 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2391 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2397 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2399 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2400 struct sk_buff *skb = rx->skb;
2401 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2404 * Pass through unencrypted frames if the hardware has
2405 * decrypted them already.
2407 if (status->flag & RX_FLAG_DECRYPTED)
2410 /* check mesh EAPOL frames first */
2411 if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2412 ieee80211_is_data(fc))) {
2413 struct ieee80211s_hdr *mesh_hdr;
2414 u16 hdr_len = ieee80211_hdrlen(fc);
2415 u16 ethertype_offset;
2418 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2421 /* make sure fixed part of mesh header is there, also checks skb len */
2422 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2425 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2426 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2427 sizeof(rfc1042_header);
2429 if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 &&
2430 ethertype == rx->sdata->control_port_protocol)
2435 /* Drop unencrypted frames if key is set. */
2436 if (unlikely(!ieee80211_has_protected(fc) &&
2437 !ieee80211_is_any_nullfunc(fc) &&
2438 ieee80211_is_data(fc) && rx->key))
2444 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2447 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2448 __le16 fc = hdr->frame_control;
2451 * Pass through unencrypted frames if the hardware has
2452 * decrypted them already.
2454 if (status->flag & RX_FLAG_DECRYPTED)
2457 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2458 if (unlikely(!ieee80211_has_protected(fc) &&
2459 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2461 if (ieee80211_is_deauth(fc) ||
2462 ieee80211_is_disassoc(fc))
2463 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2468 /* BIP does not use Protected field, so need to check MMIE */
2469 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2470 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2471 if (ieee80211_is_deauth(fc) ||
2472 ieee80211_is_disassoc(fc))
2473 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2478 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2479 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2480 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2486 * When using MFP, Action frames are not allowed prior to
2487 * having configured keys.
2489 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2490 ieee80211_is_robust_mgmt_frame(rx->skb)))
2498 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2500 struct ieee80211_sub_if_data *sdata = rx->sdata;
2501 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2502 bool check_port_control = false;
2503 struct ethhdr *ehdr;
2506 *port_control = false;
2507 if (ieee80211_has_a4(hdr->frame_control) &&
2508 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2511 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2512 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2514 if (!sdata->u.mgd.use_4addr)
2516 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2517 check_port_control = true;
2520 if (is_multicast_ether_addr(hdr->addr1) &&
2521 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2524 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2528 ehdr = (struct ethhdr *) rx->skb->data;
2529 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2530 *port_control = true;
2531 else if (check_port_control)
2538 * requires that rx->skb is a frame with ethernet header
2540 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2542 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2543 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2544 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2547 * Allow EAPOL frames to us/the PAE group address regardless
2548 * of whether the frame was encrypted or not.
2550 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2551 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2552 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2555 if (ieee80211_802_1x_port_control(rx) ||
2556 ieee80211_drop_unencrypted(rx, fc))
2562 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2563 struct ieee80211_rx_data *rx)
2565 struct ieee80211_sub_if_data *sdata = rx->sdata;
2566 struct net_device *dev = sdata->dev;
2568 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2569 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2570 !sdata->control_port_no_preauth)) &&
2571 sdata->control_port_over_nl80211)) {
2572 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2573 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2575 cfg80211_rx_control_port(dev, skb, noencrypt);
2578 memset(skb->cb, 0, sizeof(skb->cb));
2580 /* deliver to local stack */
2582 napi_gro_receive(rx->napi, skb);
2584 netif_receive_skb(skb);
2589 * requires that rx->skb is a frame with ethernet header
2592 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2594 struct ieee80211_sub_if_data *sdata = rx->sdata;
2595 struct net_device *dev = sdata->dev;
2596 struct sk_buff *skb, *xmit_skb;
2597 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2598 struct sta_info *dsta;
2603 ieee80211_rx_stats(dev, skb->len);
2606 /* The seqno index has the same property as needed
2607 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2608 * for non-QoS-data frames. Here we know it's a data
2609 * frame, so count MSDUs.
2611 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2612 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2613 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2616 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2617 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2618 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2619 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2620 if (is_multicast_ether_addr(ehdr->h_dest) &&
2621 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2623 * send multicast frames both to higher layers in
2624 * local net stack and back to the wireless medium
2626 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2628 net_info_ratelimited("%s: failed to clone multicast frame\n",
2630 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2631 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2632 dsta = sta_info_get(sdata, ehdr->h_dest);
2635 * The destination station is associated to
2636 * this AP (in this VLAN), so send the frame
2637 * directly to it and do not pass it to local
2646 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2648 /* 'align' will only take the values 0 or 2 here since all
2649 * frames are required to be aligned to 2-byte boundaries
2650 * when being passed to mac80211; the code here works just
2651 * as well if that isn't true, but mac80211 assumes it can
2652 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2656 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2658 if (WARN_ON(skb_headroom(skb) < 3)) {
2662 u8 *data = skb->data;
2663 size_t len = skb_headlen(skb);
2665 memmove(skb->data, data, len);
2666 skb_set_tail_pointer(skb, len);
2673 skb->protocol = eth_type_trans(skb, dev);
2674 ieee80211_deliver_skb_to_local_stack(skb, rx);
2679 * Send to wireless media and increase priority by 256 to
2680 * keep the received priority instead of reclassifying
2681 * the frame (see cfg80211_classify8021d).
2683 xmit_skb->priority += 256;
2684 xmit_skb->protocol = htons(ETH_P_802_3);
2685 skb_reset_network_header(xmit_skb);
2686 skb_reset_mac_header(xmit_skb);
2687 dev_queue_xmit(xmit_skb);
2691 static ieee80211_rx_result debug_noinline
2692 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2694 struct net_device *dev = rx->sdata->dev;
2695 struct sk_buff *skb = rx->skb;
2696 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2697 __le16 fc = hdr->frame_control;
2698 struct sk_buff_head frame_list;
2699 struct ethhdr ethhdr;
2700 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2702 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2705 } else switch (rx->sdata->vif.type) {
2706 case NL80211_IFTYPE_AP:
2707 case NL80211_IFTYPE_AP_VLAN:
2710 case NL80211_IFTYPE_STATION:
2712 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2715 case NL80211_IFTYPE_MESH_POINT:
2723 __skb_queue_head_init(&frame_list);
2725 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2726 rx->sdata->vif.addr,
2727 rx->sdata->vif.type,
2729 return RX_DROP_UNUSABLE;
2731 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2732 rx->sdata->vif.type,
2733 rx->local->hw.extra_tx_headroom,
2734 check_da, check_sa);
2736 while (!skb_queue_empty(&frame_list)) {
2737 rx->skb = __skb_dequeue(&frame_list);
2739 if (!ieee80211_frame_allowed(rx, fc)) {
2740 dev_kfree_skb(rx->skb);
2744 ieee80211_deliver_skb(rx);
2750 static ieee80211_rx_result debug_noinline
2751 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2753 struct sk_buff *skb = rx->skb;
2754 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2756 __le16 fc = hdr->frame_control;
2758 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2761 if (unlikely(!ieee80211_is_data(fc)))
2764 if (unlikely(!ieee80211_is_data_present(fc)))
2765 return RX_DROP_MONITOR;
2767 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2768 switch (rx->sdata->vif.type) {
2769 case NL80211_IFTYPE_AP_VLAN:
2770 if (!rx->sdata->u.vlan.sta)
2771 return RX_DROP_UNUSABLE;
2773 case NL80211_IFTYPE_STATION:
2774 if (!rx->sdata->u.mgd.use_4addr)
2775 return RX_DROP_UNUSABLE;
2778 return RX_DROP_UNUSABLE;
2782 if (is_multicast_ether_addr(hdr->addr1))
2783 return RX_DROP_UNUSABLE;
2785 return __ieee80211_rx_h_amsdu(rx, 0);
2788 #ifdef CONFIG_MAC80211_MESH
2789 static ieee80211_rx_result
2790 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2792 struct ieee80211_hdr *fwd_hdr, *hdr;
2793 struct ieee80211_tx_info *info;
2794 struct ieee80211s_hdr *mesh_hdr;
2795 struct sk_buff *skb = rx->skb, *fwd_skb;
2796 struct ieee80211_local *local = rx->local;
2797 struct ieee80211_sub_if_data *sdata = rx->sdata;
2798 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2802 hdr = (struct ieee80211_hdr *) skb->data;
2803 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2805 /* make sure fixed part of mesh header is there, also checks skb len */
2806 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2807 return RX_DROP_MONITOR;
2809 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2811 /* make sure full mesh header is there, also checks skb len */
2812 if (!pskb_may_pull(rx->skb,
2813 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2814 return RX_DROP_MONITOR;
2816 /* reload pointers */
2817 hdr = (struct ieee80211_hdr *) skb->data;
2818 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2820 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2821 return RX_DROP_MONITOR;
2823 /* frame is in RMC, don't forward */
2824 if (ieee80211_is_data(hdr->frame_control) &&
2825 is_multicast_ether_addr(hdr->addr1) &&
2826 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2827 return RX_DROP_MONITOR;
2829 if (!ieee80211_is_data(hdr->frame_control))
2833 return RX_DROP_MONITOR;
2835 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2836 struct mesh_path *mppath;
2840 if (is_multicast_ether_addr(hdr->addr1)) {
2841 mpp_addr = hdr->addr3;
2842 proxied_addr = mesh_hdr->eaddr1;
2843 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2844 MESH_FLAGS_AE_A5_A6) {
2845 /* has_a4 already checked in ieee80211_rx_mesh_check */
2846 mpp_addr = hdr->addr4;
2847 proxied_addr = mesh_hdr->eaddr2;
2849 return RX_DROP_MONITOR;
2853 mppath = mpp_path_lookup(sdata, proxied_addr);
2855 mpp_path_add(sdata, proxied_addr, mpp_addr);
2857 spin_lock_bh(&mppath->state_lock);
2858 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2859 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2860 mppath->exp_time = jiffies;
2861 spin_unlock_bh(&mppath->state_lock);
2866 /* Frame has reached destination. Don't forward */
2867 if (!is_multicast_ether_addr(hdr->addr1) &&
2868 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2871 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2872 q = sdata->vif.hw_queue[ac];
2873 if (ieee80211_queue_stopped(&local->hw, q)) {
2874 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2875 return RX_DROP_MONITOR;
2877 skb_set_queue_mapping(skb, q);
2879 if (!--mesh_hdr->ttl) {
2880 if (!is_multicast_ether_addr(hdr->addr1))
2881 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2882 dropped_frames_ttl);
2886 if (!ifmsh->mshcfg.dot11MeshForwarding)
2889 if (sdata->crypto_tx_tailroom_needed_cnt)
2890 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2892 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2893 sdata->encrypt_headroom,
2894 tailroom, GFP_ATOMIC);
2898 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2899 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2900 info = IEEE80211_SKB_CB(fwd_skb);
2901 memset(info, 0, sizeof(*info));
2902 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2903 info->control.vif = &rx->sdata->vif;
2904 info->control.jiffies = jiffies;
2905 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2906 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2907 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2908 /* update power mode indication when forwarding */
2909 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2910 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2911 /* mesh power mode flags updated in mesh_nexthop_lookup */
2912 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2914 /* unable to resolve next hop */
2915 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2917 WLAN_REASON_MESH_PATH_NOFORWARD,
2919 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2921 return RX_DROP_MONITOR;
2924 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2925 ieee80211_add_pending_skb(local, fwd_skb);
2927 if (is_multicast_ether_addr(hdr->addr1))
2929 return RX_DROP_MONITOR;
2933 static ieee80211_rx_result debug_noinline
2934 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2936 struct ieee80211_sub_if_data *sdata = rx->sdata;
2937 struct ieee80211_local *local = rx->local;
2938 struct net_device *dev = sdata->dev;
2939 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2940 __le16 fc = hdr->frame_control;
2944 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2947 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2948 return RX_DROP_MONITOR;
2951 * Send unexpected-4addr-frame event to hostapd. For older versions,
2952 * also drop the frame to cooked monitor interfaces.
2954 if (ieee80211_has_a4(hdr->frame_control) &&
2955 sdata->vif.type == NL80211_IFTYPE_AP) {
2957 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2958 cfg80211_rx_unexpected_4addr_frame(
2959 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2960 return RX_DROP_MONITOR;
2963 err = __ieee80211_data_to_8023(rx, &port_control);
2965 return RX_DROP_UNUSABLE;
2967 if (!ieee80211_frame_allowed(rx, fc))
2968 return RX_DROP_MONITOR;
2970 /* directly handle TDLS channel switch requests/responses */
2971 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2972 cpu_to_be16(ETH_P_TDLS))) {
2973 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2975 if (pskb_may_pull(rx->skb,
2976 offsetof(struct ieee80211_tdls_data, u)) &&
2977 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2978 tf->category == WLAN_CATEGORY_TDLS &&
2979 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2980 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2981 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2982 schedule_work(&local->tdls_chsw_work);
2984 rx->sta->rx_stats.packets++;
2990 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2991 unlikely(port_control) && sdata->bss) {
2992 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3000 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3001 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3002 !is_multicast_ether_addr(
3003 ((struct ethhdr *)rx->skb->data)->h_dest) &&
3004 (!local->scanning &&
3005 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3006 mod_timer(&local->dynamic_ps_timer, jiffies +
3007 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3009 ieee80211_deliver_skb(rx);
3014 static ieee80211_rx_result debug_noinline
3015 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3017 struct sk_buff *skb = rx->skb;
3018 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3019 struct tid_ampdu_rx *tid_agg_rx;
3023 if (likely(!ieee80211_is_ctl(bar->frame_control)))
3026 if (ieee80211_is_back_req(bar->frame_control)) {
3028 __le16 control, start_seq_num;
3029 } __packed bar_data;
3030 struct ieee80211_event event = {
3031 .type = BAR_RX_EVENT,
3035 return RX_DROP_MONITOR;
3037 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3038 &bar_data, sizeof(bar_data)))
3039 return RX_DROP_MONITOR;
3041 tid = le16_to_cpu(bar_data.control) >> 12;
3043 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3044 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3045 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3046 WLAN_BACK_RECIPIENT,
3047 WLAN_REASON_QSTA_REQUIRE_SETUP);
3049 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3051 return RX_DROP_MONITOR;
3053 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3054 event.u.ba.tid = tid;
3055 event.u.ba.ssn = start_seq_num;
3056 event.u.ba.sta = &rx->sta->sta;
3058 /* reset session timer */
3059 if (tid_agg_rx->timeout)
3060 mod_timer(&tid_agg_rx->session_timer,
3061 TU_TO_EXP_TIME(tid_agg_rx->timeout));
3063 spin_lock(&tid_agg_rx->reorder_lock);
3064 /* release stored frames up to start of BAR */
3065 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3066 start_seq_num, frames);
3067 spin_unlock(&tid_agg_rx->reorder_lock);
3069 drv_event_callback(rx->local, rx->sdata, &event);
3076 * After this point, we only want management frames,
3077 * so we can drop all remaining control frames to
3078 * cooked monitor interfaces.
3080 return RX_DROP_MONITOR;
3083 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3084 struct ieee80211_mgmt *mgmt,
3087 struct ieee80211_local *local = sdata->local;
3088 struct sk_buff *skb;
3089 struct ieee80211_mgmt *resp;
3091 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3092 /* Not to own unicast address */
3096 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3097 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3098 /* Not from the current AP or not associated yet. */
3102 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3103 /* Too short SA Query request frame */
3107 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3111 skb_reserve(skb, local->hw.extra_tx_headroom);
3112 resp = skb_put_zero(skb, 24);
3113 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3114 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3115 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3116 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3117 IEEE80211_STYPE_ACTION);
3118 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3119 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3120 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3121 memcpy(resp->u.action.u.sa_query.trans_id,
3122 mgmt->u.action.u.sa_query.trans_id,
3123 WLAN_SA_QUERY_TR_ID_LEN);
3125 ieee80211_tx_skb(sdata, skb);
3128 static ieee80211_rx_result debug_noinline
3129 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3131 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3132 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3135 * From here on, look only at management frames.
3136 * Data and control frames are already handled,
3137 * and unknown (reserved) frames are useless.
3139 if (rx->skb->len < 24)
3140 return RX_DROP_MONITOR;
3142 if (!ieee80211_is_mgmt(mgmt->frame_control))
3143 return RX_DROP_MONITOR;
3145 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3146 ieee80211_is_beacon(mgmt->frame_control) &&
3147 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3150 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3151 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3152 sig = status->signal;
3154 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3155 rx->skb->data, rx->skb->len,
3156 ieee80211_rx_status_to_khz(status),
3158 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3161 if (ieee80211_drop_unencrypted_mgmt(rx))
3162 return RX_DROP_UNUSABLE;
3167 static ieee80211_rx_result debug_noinline
3168 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3170 struct ieee80211_local *local = rx->local;
3171 struct ieee80211_sub_if_data *sdata = rx->sdata;
3172 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3173 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3174 int len = rx->skb->len;
3176 if (!ieee80211_is_action(mgmt->frame_control))
3179 /* drop too small frames */
3180 if (len < IEEE80211_MIN_ACTION_SIZE)
3181 return RX_DROP_UNUSABLE;
3183 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3184 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3185 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3186 return RX_DROP_UNUSABLE;
3188 switch (mgmt->u.action.category) {
3189 case WLAN_CATEGORY_HT:
3190 /* reject HT action frames from stations not supporting HT */
3191 if (!rx->sta->sta.ht_cap.ht_supported)
3194 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3195 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3196 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3197 sdata->vif.type != NL80211_IFTYPE_AP &&
3198 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3201 /* verify action & smps_control/chanwidth are present */
3202 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3205 switch (mgmt->u.action.u.ht_smps.action) {
3206 case WLAN_HT_ACTION_SMPS: {
3207 struct ieee80211_supported_band *sband;
3208 enum ieee80211_smps_mode smps_mode;
3209 struct sta_opmode_info sta_opmode = {};
3211 if (sdata->vif.type != NL80211_IFTYPE_AP &&
3212 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3215 /* convert to HT capability */
3216 switch (mgmt->u.action.u.ht_smps.smps_control) {
3217 case WLAN_HT_SMPS_CONTROL_DISABLED:
3218 smps_mode = IEEE80211_SMPS_OFF;
3220 case WLAN_HT_SMPS_CONTROL_STATIC:
3221 smps_mode = IEEE80211_SMPS_STATIC;
3223 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3224 smps_mode = IEEE80211_SMPS_DYNAMIC;
3230 /* if no change do nothing */
3231 if (rx->sta->sta.smps_mode == smps_mode)
3233 rx->sta->sta.smps_mode = smps_mode;
3234 sta_opmode.smps_mode =
3235 ieee80211_smps_mode_to_smps_mode(smps_mode);
3236 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3238 sband = rx->local->hw.wiphy->bands[status->band];
3240 rate_control_rate_update(local, sband, rx->sta,
3241 IEEE80211_RC_SMPS_CHANGED);
3242 cfg80211_sta_opmode_change_notify(sdata->dev,
3248 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3249 struct ieee80211_supported_band *sband;
3250 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3251 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3252 struct sta_opmode_info sta_opmode = {};
3254 /* If it doesn't support 40 MHz it can't change ... */
3255 if (!(rx->sta->sta.ht_cap.cap &
3256 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3259 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3260 max_bw = IEEE80211_STA_RX_BW_20;
3262 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3264 /* set cur_max_bandwidth and recalc sta bw */
3265 rx->sta->cur_max_bandwidth = max_bw;
3266 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3268 if (rx->sta->sta.bandwidth == new_bw)
3271 rx->sta->sta.bandwidth = new_bw;
3272 sband = rx->local->hw.wiphy->bands[status->band];
3274 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3275 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3277 rate_control_rate_update(local, sband, rx->sta,
3278 IEEE80211_RC_BW_CHANGED);
3279 cfg80211_sta_opmode_change_notify(sdata->dev,
3290 case WLAN_CATEGORY_PUBLIC:
3291 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3293 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3297 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3299 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3300 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3302 if (len < offsetof(struct ieee80211_mgmt,
3303 u.action.u.ext_chan_switch.variable))
3306 case WLAN_CATEGORY_VHT:
3307 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3308 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3309 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3310 sdata->vif.type != NL80211_IFTYPE_AP &&
3311 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3314 /* verify action code is present */
3315 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3318 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3319 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3320 /* verify opmode is present */
3321 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3325 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3326 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3334 case WLAN_CATEGORY_BACK:
3335 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3336 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3337 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3338 sdata->vif.type != NL80211_IFTYPE_AP &&
3339 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3342 /* verify action_code is present */
3343 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3346 switch (mgmt->u.action.u.addba_req.action_code) {
3347 case WLAN_ACTION_ADDBA_REQ:
3348 if (len < (IEEE80211_MIN_ACTION_SIZE +
3349 sizeof(mgmt->u.action.u.addba_req)))
3352 case WLAN_ACTION_ADDBA_RESP:
3353 if (len < (IEEE80211_MIN_ACTION_SIZE +
3354 sizeof(mgmt->u.action.u.addba_resp)))
3357 case WLAN_ACTION_DELBA:
3358 if (len < (IEEE80211_MIN_ACTION_SIZE +
3359 sizeof(mgmt->u.action.u.delba)))
3367 case WLAN_CATEGORY_SPECTRUM_MGMT:
3368 /* verify action_code is present */
3369 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3372 switch (mgmt->u.action.u.measurement.action_code) {
3373 case WLAN_ACTION_SPCT_MSR_REQ:
3374 if (status->band != NL80211_BAND_5GHZ)
3377 if (len < (IEEE80211_MIN_ACTION_SIZE +
3378 sizeof(mgmt->u.action.u.measurement)))
3381 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3384 ieee80211_process_measurement_req(sdata, mgmt, len);
3386 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3388 if (len < (IEEE80211_MIN_ACTION_SIZE +
3389 sizeof(mgmt->u.action.u.chan_switch)))
3392 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3393 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3394 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3397 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3398 bssid = sdata->u.mgd.bssid;
3399 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3400 bssid = sdata->u.ibss.bssid;
3401 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3406 if (!ether_addr_equal(mgmt->bssid, bssid))
3413 case WLAN_CATEGORY_SELF_PROTECTED:
3414 if (len < (IEEE80211_MIN_ACTION_SIZE +
3415 sizeof(mgmt->u.action.u.self_prot.action_code)))
3418 switch (mgmt->u.action.u.self_prot.action_code) {
3419 case WLAN_SP_MESH_PEERING_OPEN:
3420 case WLAN_SP_MESH_PEERING_CLOSE:
3421 case WLAN_SP_MESH_PEERING_CONFIRM:
3422 if (!ieee80211_vif_is_mesh(&sdata->vif))
3424 if (sdata->u.mesh.user_mpm)
3425 /* userspace handles this frame */
3428 case WLAN_SP_MGK_INFORM:
3429 case WLAN_SP_MGK_ACK:
3430 if (!ieee80211_vif_is_mesh(&sdata->vif))
3435 case WLAN_CATEGORY_MESH_ACTION:
3436 if (len < (IEEE80211_MIN_ACTION_SIZE +
3437 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3440 if (!ieee80211_vif_is_mesh(&sdata->vif))
3442 if (mesh_action_is_path_sel(mgmt) &&
3443 !mesh_path_sel_is_hwmp(sdata))
3451 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3452 /* will return in the next handlers */
3457 rx->sta->rx_stats.packets++;
3458 dev_kfree_skb(rx->skb);
3462 skb_queue_tail(&sdata->skb_queue, rx->skb);
3463 ieee80211_queue_work(&local->hw, &sdata->work);
3465 rx->sta->rx_stats.packets++;
3469 static ieee80211_rx_result debug_noinline
3470 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3472 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3475 /* skip known-bad action frames and return them in the next handler */
3476 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3480 * Getting here means the kernel doesn't know how to handle
3481 * it, but maybe userspace does ... include returned frames
3482 * so userspace can register for those to know whether ones
3483 * it transmitted were processed or returned.
3486 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3487 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3488 sig = status->signal;
3490 if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev,
3491 ieee80211_rx_status_to_khz(status), sig,
3492 rx->skb->data, rx->skb->len, 0)) {
3494 rx->sta->rx_stats.packets++;
3495 dev_kfree_skb(rx->skb);
3502 static ieee80211_rx_result debug_noinline
3503 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3505 struct ieee80211_sub_if_data *sdata = rx->sdata;
3506 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3507 int len = rx->skb->len;
3509 if (!ieee80211_is_action(mgmt->frame_control))
3512 switch (mgmt->u.action.category) {
3513 case WLAN_CATEGORY_SA_QUERY:
3514 if (len < (IEEE80211_MIN_ACTION_SIZE +
3515 sizeof(mgmt->u.action.u.sa_query)))
3518 switch (mgmt->u.action.u.sa_query.action) {
3519 case WLAN_ACTION_SA_QUERY_REQUEST:
3520 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3522 ieee80211_process_sa_query_req(sdata, mgmt, len);
3532 rx->sta->rx_stats.packets++;
3533 dev_kfree_skb(rx->skb);
3537 static ieee80211_rx_result debug_noinline
3538 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3540 struct ieee80211_local *local = rx->local;
3541 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3542 struct sk_buff *nskb;
3543 struct ieee80211_sub_if_data *sdata = rx->sdata;
3544 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3546 if (!ieee80211_is_action(mgmt->frame_control))
3550 * For AP mode, hostapd is responsible for handling any action
3551 * frames that we didn't handle, including returning unknown
3552 * ones. For all other modes we will return them to the sender,
3553 * setting the 0x80 bit in the action category, as required by
3554 * 802.11-2012 9.24.4.
3555 * Newer versions of hostapd shall also use the management frame
3556 * registration mechanisms, but older ones still use cooked
3557 * monitor interfaces so push all frames there.
3559 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3560 (sdata->vif.type == NL80211_IFTYPE_AP ||
3561 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3562 return RX_DROP_MONITOR;
3564 if (is_multicast_ether_addr(mgmt->da))
3565 return RX_DROP_MONITOR;
3567 /* do not return rejected action frames */
3568 if (mgmt->u.action.category & 0x80)
3569 return RX_DROP_UNUSABLE;
3571 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3574 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3576 nmgmt->u.action.category |= 0x80;
3577 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3578 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3580 memset(nskb->cb, 0, sizeof(nskb->cb));
3582 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3585 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3586 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3587 IEEE80211_TX_CTL_NO_CCK_RATE;
3588 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3590 local->hw.offchannel_tx_hw_queue;
3593 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3596 dev_kfree_skb(rx->skb);
3600 static ieee80211_rx_result debug_noinline
3601 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3603 struct ieee80211_sub_if_data *sdata = rx->sdata;
3604 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3607 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3609 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3610 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3611 sdata->vif.type != NL80211_IFTYPE_OCB &&
3612 sdata->vif.type != NL80211_IFTYPE_STATION)
3613 return RX_DROP_MONITOR;
3616 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3617 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3618 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3619 /* process for all: mesh, mlme, ibss */
3621 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3622 if (is_multicast_ether_addr(mgmt->da) &&
3623 !is_broadcast_ether_addr(mgmt->da))
3624 return RX_DROP_MONITOR;
3626 /* process only for station/IBSS */
3627 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3628 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3629 return RX_DROP_MONITOR;
3631 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3632 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3633 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3634 if (is_multicast_ether_addr(mgmt->da) &&
3635 !is_broadcast_ether_addr(mgmt->da))
3636 return RX_DROP_MONITOR;
3638 /* process only for station */
3639 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3640 return RX_DROP_MONITOR;
3642 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3643 /* process only for ibss and mesh */
3644 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3645 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3646 return RX_DROP_MONITOR;
3649 return RX_DROP_MONITOR;
3652 /* queue up frame and kick off work to process it */
3653 skb_queue_tail(&sdata->skb_queue, rx->skb);
3654 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3656 rx->sta->rx_stats.packets++;
3661 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3662 struct ieee80211_rate *rate)
3664 struct ieee80211_sub_if_data *sdata;
3665 struct ieee80211_local *local = rx->local;
3666 struct sk_buff *skb = rx->skb, *skb2;
3667 struct net_device *prev_dev = NULL;
3668 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3669 int needed_headroom;
3672 * If cooked monitor has been processed already, then
3673 * don't do it again. If not, set the flag.
3675 if (rx->flags & IEEE80211_RX_CMNTR)
3677 rx->flags |= IEEE80211_RX_CMNTR;
3679 /* If there are no cooked monitor interfaces, just free the SKB */
3680 if (!local->cooked_mntrs)
3683 /* vendor data is long removed here */
3684 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3685 /* room for the radiotap header based on driver features */
3686 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3688 if (skb_headroom(skb) < needed_headroom &&
3689 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3692 /* prepend radiotap information */
3693 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3696 skb_reset_mac_header(skb);
3697 skb->ip_summed = CHECKSUM_UNNECESSARY;
3698 skb->pkt_type = PACKET_OTHERHOST;
3699 skb->protocol = htons(ETH_P_802_2);
3701 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3702 if (!ieee80211_sdata_running(sdata))
3705 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3706 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3710 skb2 = skb_clone(skb, GFP_ATOMIC);
3712 skb2->dev = prev_dev;
3713 netif_receive_skb(skb2);
3717 prev_dev = sdata->dev;
3718 ieee80211_rx_stats(sdata->dev, skb->len);
3722 skb->dev = prev_dev;
3723 netif_receive_skb(skb);
3731 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3732 ieee80211_rx_result res)
3735 case RX_DROP_MONITOR:
3736 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3738 rx->sta->rx_stats.dropped++;
3741 struct ieee80211_rate *rate = NULL;
3742 struct ieee80211_supported_band *sband;
3743 struct ieee80211_rx_status *status;
3745 status = IEEE80211_SKB_RXCB((rx->skb));
3747 sband = rx->local->hw.wiphy->bands[status->band];
3748 if (status->encoding == RX_ENC_LEGACY)
3749 rate = &sband->bitrates[status->rate_idx];
3751 ieee80211_rx_cooked_monitor(rx, rate);
3754 case RX_DROP_UNUSABLE:
3755 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3757 rx->sta->rx_stats.dropped++;
3758 dev_kfree_skb(rx->skb);
3761 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3766 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3767 struct sk_buff_head *frames)
3769 ieee80211_rx_result res = RX_DROP_MONITOR;
3770 struct sk_buff *skb;
3772 #define CALL_RXH(rxh) \
3775 if (res != RX_CONTINUE) \
3779 /* Lock here to avoid hitting all of the data used in the RX
3780 * path (e.g. key data, station data, ...) concurrently when
3781 * a frame is released from the reorder buffer due to timeout
3782 * from the timer, potentially concurrently with RX from the
3785 spin_lock_bh(&rx->local->rx_path_lock);
3787 while ((skb = __skb_dequeue(frames))) {
3789 * all the other fields are valid across frames
3790 * that belong to an aMPDU since they are on the
3791 * same TID from the same station
3795 CALL_RXH(ieee80211_rx_h_check_more_data);
3796 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3797 CALL_RXH(ieee80211_rx_h_sta_process);
3798 CALL_RXH(ieee80211_rx_h_decrypt);
3799 CALL_RXH(ieee80211_rx_h_defragment);
3800 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3801 /* must be after MMIC verify so header is counted in MPDU mic */
3802 #ifdef CONFIG_MAC80211_MESH
3803 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3804 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3806 CALL_RXH(ieee80211_rx_h_amsdu);
3807 CALL_RXH(ieee80211_rx_h_data);
3809 /* special treatment -- needs the queue */
3810 res = ieee80211_rx_h_ctrl(rx, frames);
3811 if (res != RX_CONTINUE)
3814 CALL_RXH(ieee80211_rx_h_mgmt_check);
3815 CALL_RXH(ieee80211_rx_h_action);
3816 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3817 CALL_RXH(ieee80211_rx_h_action_post_userspace);
3818 CALL_RXH(ieee80211_rx_h_action_return);
3819 CALL_RXH(ieee80211_rx_h_mgmt);
3822 ieee80211_rx_handlers_result(rx, res);
3827 spin_unlock_bh(&rx->local->rx_path_lock);
3830 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3832 struct sk_buff_head reorder_release;
3833 ieee80211_rx_result res = RX_DROP_MONITOR;
3835 __skb_queue_head_init(&reorder_release);
3837 #define CALL_RXH(rxh) \
3840 if (res != RX_CONTINUE) \
3844 CALL_RXH(ieee80211_rx_h_check_dup);
3845 CALL_RXH(ieee80211_rx_h_check);
3847 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3849 ieee80211_rx_handlers(rx, &reorder_release);
3853 ieee80211_rx_handlers_result(rx, res);
3859 * This function makes calls into the RX path, therefore
3860 * it has to be invoked under RCU read lock.
3862 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3864 struct sk_buff_head frames;
3865 struct ieee80211_rx_data rx = {
3867 .sdata = sta->sdata,
3868 .local = sta->local,
3869 /* This is OK -- must be QoS data frame */
3870 .security_idx = tid,
3872 .napi = NULL, /* must be NULL to not have races */
3874 struct tid_ampdu_rx *tid_agg_rx;
3876 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3880 __skb_queue_head_init(&frames);
3882 spin_lock(&tid_agg_rx->reorder_lock);
3883 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3884 spin_unlock(&tid_agg_rx->reorder_lock);
3886 if (!skb_queue_empty(&frames)) {
3887 struct ieee80211_event event = {
3888 .type = BA_FRAME_TIMEOUT,
3890 .u.ba.sta = &sta->sta,
3892 drv_event_callback(rx.local, rx.sdata, &event);
3895 ieee80211_rx_handlers(&rx, &frames);
3898 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3899 u16 ssn, u64 filtered,
3902 struct sta_info *sta;
3903 struct tid_ampdu_rx *tid_agg_rx;
3904 struct sk_buff_head frames;
3905 struct ieee80211_rx_data rx = {
3906 /* This is OK -- must be QoS data frame */
3907 .security_idx = tid,
3912 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3915 __skb_queue_head_init(&frames);
3917 sta = container_of(pubsta, struct sta_info, sta);
3920 rx.sdata = sta->sdata;
3921 rx.local = sta->local;
3924 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3928 spin_lock_bh(&tid_agg_rx->reorder_lock);
3930 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3933 /* release all frames in the reorder buffer */
3934 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3935 IEEE80211_SN_MODULO;
3936 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3938 /* update ssn to match received ssn */
3939 tid_agg_rx->head_seq_num = ssn;
3941 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3945 /* handle the case that received ssn is behind the mac ssn.
3946 * it can be tid_agg_rx->buf_size behind and still be valid */
3947 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3948 if (diff >= tid_agg_rx->buf_size) {
3949 tid_agg_rx->reorder_buf_filtered = 0;
3952 filtered = filtered >> diff;
3956 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3957 int index = (ssn + i) % tid_agg_rx->buf_size;
3959 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3960 if (filtered & BIT_ULL(i))
3961 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3964 /* now process also frames that the filter marking released */
3965 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3968 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3970 ieee80211_rx_handlers(&rx, &frames);
3975 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3977 /* main receive path */
3979 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3981 struct ieee80211_sub_if_data *sdata = rx->sdata;
3982 struct sk_buff *skb = rx->skb;
3983 struct ieee80211_hdr *hdr = (void *)skb->data;
3984 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3985 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3986 bool multicast = is_multicast_ether_addr(hdr->addr1);
3988 switch (sdata->vif.type) {
3989 case NL80211_IFTYPE_STATION:
3990 if (!bssid && !sdata->u.mgd.use_4addr)
3992 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3996 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3997 case NL80211_IFTYPE_ADHOC:
4000 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4001 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
4003 if (ieee80211_is_beacon(hdr->frame_control))
4005 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4008 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4012 if (status->encoding != RX_ENC_LEGACY)
4013 rate_idx = 0; /* TODO: HT/VHT rates */
4015 rate_idx = status->rate_idx;
4016 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4020 case NL80211_IFTYPE_OCB:
4023 if (!ieee80211_is_data_present(hdr->frame_control))
4025 if (!is_broadcast_ether_addr(bssid))
4028 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4032 if (status->encoding != RX_ENC_LEGACY)
4033 rate_idx = 0; /* TODO: HT rates */
4035 rate_idx = status->rate_idx;
4036 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4040 case NL80211_IFTYPE_MESH_POINT:
4041 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4045 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4046 case NL80211_IFTYPE_AP_VLAN:
4047 case NL80211_IFTYPE_AP:
4049 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4051 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4053 * Accept public action frames even when the
4054 * BSSID doesn't match, this is used for P2P
4055 * and location updates. Note that mac80211
4056 * itself never looks at these frames.
4059 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4061 if (ieee80211_is_public_action(hdr, skb->len))
4063 return ieee80211_is_beacon(hdr->frame_control);
4066 if (!ieee80211_has_tods(hdr->frame_control)) {
4067 /* ignore data frames to TDLS-peers */
4068 if (ieee80211_is_data(hdr->frame_control))
4070 /* ignore action frames to TDLS-peers */
4071 if (ieee80211_is_action(hdr->frame_control) &&
4072 !is_broadcast_ether_addr(bssid) &&
4073 !ether_addr_equal(bssid, hdr->addr1))
4078 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4079 * the BSSID - we've checked that already but may have accepted
4080 * the wildcard (ff:ff:ff:ff:ff:ff).
4083 * The BSSID of the Data frame is determined as follows:
4084 * a) If the STA is contained within an AP or is associated
4085 * with an AP, the BSSID is the address currently in use
4086 * by the STA contained in the AP.
4088 * So we should not accept data frames with an address that's
4091 * Accepting it also opens a security problem because stations
4092 * could encrypt it with the GTK and inject traffic that way.
4094 if (ieee80211_is_data(hdr->frame_control) && multicast)
4098 case NL80211_IFTYPE_WDS:
4099 if (bssid || !ieee80211_is_data(hdr->frame_control))
4101 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
4102 case NL80211_IFTYPE_P2P_DEVICE:
4103 return ieee80211_is_public_action(hdr, skb->len) ||
4104 ieee80211_is_probe_req(hdr->frame_control) ||
4105 ieee80211_is_probe_resp(hdr->frame_control) ||
4106 ieee80211_is_beacon(hdr->frame_control);
4107 case NL80211_IFTYPE_NAN:
4108 /* Currently no frames on NAN interface are allowed */
4118 void ieee80211_check_fast_rx(struct sta_info *sta)
4120 struct ieee80211_sub_if_data *sdata = sta->sdata;
4121 struct ieee80211_local *local = sdata->local;
4122 struct ieee80211_key *key;
4123 struct ieee80211_fast_rx fastrx = {
4125 .vif_type = sdata->vif.type,
4126 .control_port_protocol = sdata->control_port_protocol,
4127 }, *old, *new = NULL;
4128 bool assign = false;
4130 /* use sparse to check that we don't return without updating */
4131 __acquire(check_fast_rx);
4133 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4134 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4135 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4136 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4138 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4140 /* fast-rx doesn't do reordering */
4141 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4142 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4145 switch (sdata->vif.type) {
4146 case NL80211_IFTYPE_STATION:
4147 if (sta->sta.tdls) {
4148 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4149 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4150 fastrx.expected_ds_bits = 0;
4152 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
4153 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4154 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4155 fastrx.expected_ds_bits =
4156 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4159 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4160 fastrx.expected_ds_bits |=
4161 cpu_to_le16(IEEE80211_FCTL_TODS);
4162 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4163 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4166 if (!sdata->u.mgd.powersave)
4169 /* software powersave is a huge mess, avoid all of it */
4170 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4172 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4173 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4176 case NL80211_IFTYPE_AP_VLAN:
4177 case NL80211_IFTYPE_AP:
4178 /* parallel-rx requires this, at least with calls to
4179 * ieee80211_sta_ps_transition()
4181 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4183 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4184 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4185 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4187 fastrx.internal_forward =
4188 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4189 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4190 !sdata->u.vlan.sta);
4192 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4193 sdata->u.vlan.sta) {
4194 fastrx.expected_ds_bits |=
4195 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4196 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4197 fastrx.internal_forward = 0;
4205 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4209 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4211 switch (key->conf.cipher) {
4212 case WLAN_CIPHER_SUITE_TKIP:
4213 /* we don't want to deal with MMIC in fast-rx */
4215 case WLAN_CIPHER_SUITE_CCMP:
4216 case WLAN_CIPHER_SUITE_CCMP_256:
4217 case WLAN_CIPHER_SUITE_GCMP:
4218 case WLAN_CIPHER_SUITE_GCMP_256:
4221 /* We also don't want to deal with
4222 * WEP or cipher scheme.
4228 fastrx.icv_len = key->conf.icv_len;
4235 __release(check_fast_rx);
4238 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4240 spin_lock_bh(&sta->lock);
4241 old = rcu_dereference_protected(sta->fast_rx, true);
4242 rcu_assign_pointer(sta->fast_rx, new);
4243 spin_unlock_bh(&sta->lock);
4246 kfree_rcu(old, rcu_head);
4249 void ieee80211_clear_fast_rx(struct sta_info *sta)
4251 struct ieee80211_fast_rx *old;
4253 spin_lock_bh(&sta->lock);
4254 old = rcu_dereference_protected(sta->fast_rx, true);
4255 RCU_INIT_POINTER(sta->fast_rx, NULL);
4256 spin_unlock_bh(&sta->lock);
4259 kfree_rcu(old, rcu_head);
4262 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4264 struct ieee80211_local *local = sdata->local;
4265 struct sta_info *sta;
4267 lockdep_assert_held(&local->sta_mtx);
4269 list_for_each_entry(sta, &local->sta_list, list) {
4270 if (sdata != sta->sdata &&
4271 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4273 ieee80211_check_fast_rx(sta);
4277 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4279 struct ieee80211_local *local = sdata->local;
4281 mutex_lock(&local->sta_mtx);
4282 __ieee80211_check_fast_rx_iface(sdata);
4283 mutex_unlock(&local->sta_mtx);
4286 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4287 struct ieee80211_fast_rx *fast_rx)
4289 struct sk_buff *skb = rx->skb;
4290 struct ieee80211_hdr *hdr = (void *)skb->data;
4291 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4292 struct sta_info *sta = rx->sta;
4293 int orig_len = skb->len;
4294 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4295 int snap_offs = hdrlen;
4297 u8 snap[sizeof(rfc1042_header)];
4299 } *payload __aligned(2);
4303 } addrs __aligned(2);
4304 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4306 if (fast_rx->uses_rss)
4307 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4309 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4310 * to a common data structure; drivers can implement that per queue
4311 * but we don't have that information in mac80211
4313 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4316 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4318 /* If using encryption, we also need to have:
4319 * - PN_VALIDATED: similar, but the implementation is tricky
4320 * - DECRYPTED: necessary for PN_VALIDATED
4323 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4326 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4329 if (unlikely(ieee80211_is_frag(hdr)))
4332 /* Since our interface address cannot be multicast, this
4333 * implicitly also rejects multicast frames without the
4336 * We shouldn't get any *data* frames not addressed to us
4337 * (AP mode will accept multicast *management* frames), but
4338 * punting here will make it go through the full checks in
4339 * ieee80211_accept_frame().
4341 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4344 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4345 IEEE80211_FCTL_TODS)) !=
4346 fast_rx->expected_ds_bits)
4349 /* assign the key to drop unencrypted frames (later)
4350 * and strip the IV/MIC if necessary
4352 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4353 /* GCMP header length is the same */
4354 snap_offs += IEEE80211_CCMP_HDR_LEN;
4357 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4358 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4361 payload = (void *)(skb->data + snap_offs);
4363 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4366 /* Don't handle these here since they require special code.
4367 * Accept AARP and IPX even though they should come with a
4368 * bridge-tunnel header - but if we get them this way then
4369 * there's little point in discarding them.
4371 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4372 payload->proto == fast_rx->control_port_protocol))
4376 /* after this point, don't punt to the slowpath! */
4378 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4379 pskb_trim(skb, skb->len - fast_rx->icv_len))
4382 if (unlikely(fast_rx->sta_notify)) {
4383 ieee80211_sta_rx_notify(rx->sdata, hdr);
4384 fast_rx->sta_notify = false;
4387 /* statistics part of ieee80211_rx_h_sta_process() */
4388 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4389 stats->last_signal = status->signal;
4390 if (!fast_rx->uses_rss)
4391 ewma_signal_add(&sta->rx_stats_avg.signal,
4395 if (status->chains) {
4398 stats->chains = status->chains;
4399 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4400 int signal = status->chain_signal[i];
4402 if (!(status->chains & BIT(i)))
4405 stats->chain_signal_last[i] = signal;
4406 if (!fast_rx->uses_rss)
4407 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4411 /* end of statistics */
4413 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4416 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4417 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4424 stats->last_rx = jiffies;
4425 stats->last_rate = sta_stats_encode_rate(status);
4430 /* do the header conversion - first grab the addresses */
4431 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4432 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4433 /* remove the SNAP but leave the ethertype */
4434 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4435 /* push the addresses in front */
4436 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4438 skb->dev = fast_rx->dev;
4440 ieee80211_rx_stats(fast_rx->dev, skb->len);
4442 /* The seqno index has the same property as needed
4443 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4444 * for non-QoS-data frames. Here we know it's a data
4445 * frame, so count MSDUs.
4447 u64_stats_update_begin(&stats->syncp);
4448 stats->msdu[rx->seqno_idx]++;
4449 stats->bytes += orig_len;
4450 u64_stats_update_end(&stats->syncp);
4452 if (fast_rx->internal_forward) {
4453 struct sk_buff *xmit_skb = NULL;
4454 if (is_multicast_ether_addr(addrs.da)) {
4455 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4456 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4457 sta_info_get(rx->sdata, addrs.da)) {
4464 * Send to wireless media and increase priority by 256
4465 * to keep the received priority instead of
4466 * reclassifying the frame (see cfg80211_classify8021d).
4468 xmit_skb->priority += 256;
4469 xmit_skb->protocol = htons(ETH_P_802_3);
4470 skb_reset_network_header(xmit_skb);
4471 skb_reset_mac_header(xmit_skb);
4472 dev_queue_xmit(xmit_skb);
4479 /* deliver to local stack */
4480 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4481 memset(skb->cb, 0, sizeof(skb->cb));
4483 napi_gro_receive(rx->napi, skb);
4485 netif_receive_skb(skb);
4495 * This function returns whether or not the SKB
4496 * was destined for RX processing or not, which,
4497 * if consume is true, is equivalent to whether
4498 * or not the skb was consumed.
4500 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4501 struct sk_buff *skb, bool consume)
4503 struct ieee80211_local *local = rx->local;
4504 struct ieee80211_sub_if_data *sdata = rx->sdata;
4508 /* See if we can do fast-rx; if we have to copy we already lost,
4509 * so punt in that case. We should never have to deliver a data
4510 * frame to multiple interfaces anyway.
4512 * We skip the ieee80211_accept_frame() call and do the necessary
4513 * checking inside ieee80211_invoke_fast_rx().
4515 if (consume && rx->sta) {
4516 struct ieee80211_fast_rx *fast_rx;
4518 fast_rx = rcu_dereference(rx->sta->fast_rx);
4519 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4523 if (!ieee80211_accept_frame(rx))
4527 skb = skb_copy(skb, GFP_ATOMIC);
4529 if (net_ratelimit())
4530 wiphy_debug(local->hw.wiphy,
4531 "failed to copy skb for %s\n",
4539 ieee80211_invoke_rx_handlers(rx);
4544 * This is the actual Rx frames handler. as it belongs to Rx path it must
4545 * be called with rcu_read_lock protection.
4547 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4548 struct ieee80211_sta *pubsta,
4549 struct sk_buff *skb,
4550 struct napi_struct *napi)
4552 struct ieee80211_local *local = hw_to_local(hw);
4553 struct ieee80211_sub_if_data *sdata;
4554 struct ieee80211_hdr *hdr;
4556 struct ieee80211_rx_data rx;
4557 struct ieee80211_sub_if_data *prev;
4558 struct rhlist_head *tmp;
4561 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4562 memset(&rx, 0, sizeof(rx));
4567 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4568 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4570 if (ieee80211_is_mgmt(fc)) {
4571 /* drop frame if too short for header */
4572 if (skb->len < ieee80211_hdrlen(fc))
4575 err = skb_linearize(skb);
4577 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4585 hdr = (struct ieee80211_hdr *)skb->data;
4586 ieee80211_parse_qos(&rx);
4587 ieee80211_verify_alignment(&rx);
4589 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4590 ieee80211_is_beacon(hdr->frame_control)))
4591 ieee80211_scan_rx(local, skb);
4593 if (ieee80211_is_data(fc)) {
4594 struct sta_info *sta, *prev_sta;
4597 rx.sta = container_of(pubsta, struct sta_info, sta);
4598 rx.sdata = rx.sta->sdata;
4599 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4606 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4613 rx.sdata = prev_sta->sdata;
4614 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4621 rx.sdata = prev_sta->sdata;
4623 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4631 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4632 if (!ieee80211_sdata_running(sdata))
4635 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4636 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4640 * frame is destined for this interface, but if it's
4641 * not also for the previous one we handle that after
4642 * the loop to avoid copying the SKB once too much
4650 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4652 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4658 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4661 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4670 * This is the receive path handler. It is called by a low level driver when an
4671 * 802.11 MPDU is received from the hardware.
4673 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4674 struct sk_buff *skb, struct napi_struct *napi)
4676 struct ieee80211_local *local = hw_to_local(hw);
4677 struct ieee80211_rate *rate = NULL;
4678 struct ieee80211_supported_band *sband;
4679 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4681 WARN_ON_ONCE(softirq_count() == 0);
4683 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4686 sband = local->hw.wiphy->bands[status->band];
4687 if (WARN_ON(!sband))
4691 * If we're suspending, it is possible although not too likely
4692 * that we'd be receiving frames after having already partially
4693 * quiesced the stack. We can't process such frames then since
4694 * that might, for example, cause stations to be added or other
4695 * driver callbacks be invoked.
4697 if (unlikely(local->quiescing || local->suspended))
4700 /* We might be during a HW reconfig, prevent Rx for the same reason */
4701 if (unlikely(local->in_reconfig))
4705 * The same happens when we're not even started,
4706 * but that's worth a warning.
4708 if (WARN_ON(!local->started))
4711 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4713 * Validate the rate, unless a PLCP error means that
4714 * we probably can't have a valid rate here anyway.
4717 switch (status->encoding) {
4720 * rate_idx is MCS index, which can be [0-76]
4723 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
4725 * Anything else would be some sort of driver or
4726 * hardware error. The driver should catch hardware
4729 if (WARN(status->rate_idx > 76,
4730 "Rate marked as an HT rate but passed "
4731 "status->rate_idx is not "
4732 "an MCS index [0-76]: %d (0x%02x)\n",
4738 if (WARN_ONCE(status->rate_idx > 9 ||
4741 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4742 status->rate_idx, status->nss))
4746 if (WARN_ONCE(status->rate_idx > 11 ||
4749 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4750 status->rate_idx, status->nss))
4757 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4759 rate = &sband->bitrates[status->rate_idx];
4763 status->rx_flags = 0;
4766 * key references and virtual interfaces are protected using RCU
4767 * and this requires that we are in a read-side RCU section during
4768 * receive processing
4773 * Frames with failed FCS/PLCP checksum are not returned,
4774 * all other frames are returned without radiotap header
4775 * if it was previously present.
4776 * Also, frames with less than 16 bytes are dropped.
4778 skb = ieee80211_rx_monitor(local, skb, rate);
4784 ieee80211_tpt_led_trig_rx(local,
4785 ((struct ieee80211_hdr *)skb->data)->frame_control,
4788 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4796 EXPORT_SYMBOL(ieee80211_rx_napi);
4798 /* This is a version of the rx handler that can be called from hard irq
4799 * context. Post the skb on the queue and schedule the tasklet */
4800 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4802 struct ieee80211_local *local = hw_to_local(hw);
4804 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4806 skb->pkt_type = IEEE80211_RX_MSG;
4807 skb_queue_tail(&local->skb_queue, skb);
4808 tasklet_schedule(&local->tasklet);
4810 EXPORT_SYMBOL(ieee80211_rx_irqsafe);