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) 2018-2022 Intel Corporation
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <linux/kcov.h>
21 #include <linux/bitops.h>
22 #include <net/mac80211.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
37 * monitor mode reception
39 * This function cleans up the SKB, i.e. it removes all the stuff
40 * only useful for monitoring.
42 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
43 unsigned int present_fcs_len,
44 unsigned int rtap_space)
46 struct ieee80211_hdr *hdr;
51 __pskb_trim(skb, skb->len - present_fcs_len);
52 pskb_pull(skb, rtap_space);
54 hdr = (void *)skb->data;
55 fc = hdr->frame_control;
58 * Remove the HT-Control field (if present) on management
59 * frames after we've sent the frame to monitoring. We
60 * (currently) don't need it, and don't properly parse
61 * frames with it present, due to the assumption of a
62 * fixed management header length.
64 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
67 hdrlen = ieee80211_hdrlen(fc);
68 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
70 if (!pskb_may_pull(skb, hdrlen)) {
75 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
76 hdrlen - IEEE80211_HT_CTL_LEN);
77 pskb_pull(skb, IEEE80211_HT_CTL_LEN);
82 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
83 unsigned int rtap_space)
85 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
86 struct ieee80211_hdr *hdr;
88 hdr = (void *)(skb->data + rtap_space);
90 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
91 RX_FLAG_FAILED_PLCP_CRC |
92 RX_FLAG_ONLY_MONITOR |
96 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
99 if (ieee80211_is_ctl(hdr->frame_control) &&
100 !ieee80211_is_pspoll(hdr->frame_control) &&
101 !ieee80211_is_back_req(hdr->frame_control))
108 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
109 struct ieee80211_rx_status *status,
114 /* always present fields */
115 len = sizeof(struct ieee80211_radiotap_header) + 8;
117 /* allocate extra bitmaps */
119 len += 4 * hweight8(status->chains);
120 /* vendor presence bitmap */
121 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
124 if (ieee80211_have_rx_timestamp(status)) {
128 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
131 /* antenna field, if we don't have per-chain info */
135 /* padding for RX_FLAGS if necessary */
138 if (status->encoding == RX_ENC_HT) /* HT info */
141 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
146 if (status->encoding == RX_ENC_VHT) {
151 if (local->hw.radiotap_timestamp.units_pos >= 0) {
156 if (status->encoding == RX_ENC_HE &&
157 status->flag & RX_FLAG_RADIOTAP_HE) {
160 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
163 if (status->encoding == RX_ENC_HE &&
164 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
167 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
170 if (status->flag & RX_FLAG_NO_PSDU)
173 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
176 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
179 if (status->chains) {
180 /* antenna and antenna signal fields */
181 len += 2 * hweight8(status->chains);
184 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
185 struct ieee80211_vendor_radiotap *rtap;
186 int vendor_data_offset = 0;
189 * The position to look at depends on the existence (or non-
190 * existence) of other elements, so take that into account...
192 if (status->flag & RX_FLAG_RADIOTAP_HE)
193 vendor_data_offset +=
194 sizeof(struct ieee80211_radiotap_he);
195 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
196 vendor_data_offset +=
197 sizeof(struct ieee80211_radiotap_he_mu);
198 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
199 vendor_data_offset +=
200 sizeof(struct ieee80211_radiotap_lsig);
202 rtap = (void *)&skb->data[vendor_data_offset];
204 /* alignment for fixed 6-byte vendor data header */
206 /* vendor data header */
208 if (WARN_ON(rtap->align == 0))
210 len = ALIGN(len, rtap->align);
211 len += rtap->len + rtap->pad;
217 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
219 struct sta_info *sta,
222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
225 status->link_valid = 1;
226 status->link_id = link_id;
228 status->link_valid = 0;
231 skb_queue_tail(&sdata->skb_queue, skb);
232 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
234 sta->deflink.rx_stats.packets++;
237 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
239 struct sta_info *sta,
243 __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
246 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
251 struct ieee80211_hdr_3addr hdr;
254 } __packed __aligned(2) action;
259 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
261 if (skb->len < rtap_space + sizeof(action) +
262 VHT_MUMIMO_GROUPS_DATA_LEN)
265 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
268 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
270 if (!ieee80211_is_action(action.hdr.frame_control))
273 if (action.category != WLAN_CATEGORY_VHT)
276 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
279 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
282 skb = skb_copy(skb, GFP_ATOMIC);
286 ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb);
290 * ieee80211_add_rx_radiotap_header - add radiotap header
292 * add a radiotap header containing all the fields which the hardware provided.
295 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
297 struct ieee80211_rate *rate,
298 int rtap_len, bool has_fcs)
300 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
301 struct ieee80211_radiotap_header *rthdr;
306 u16 channel_flags = 0;
308 unsigned long chains = status->chains;
309 struct ieee80211_vendor_radiotap rtap = {};
310 struct ieee80211_radiotap_he he = {};
311 struct ieee80211_radiotap_he_mu he_mu = {};
312 struct ieee80211_radiotap_lsig lsig = {};
314 if (status->flag & RX_FLAG_RADIOTAP_HE) {
315 he = *(struct ieee80211_radiotap_he *)skb->data;
316 skb_pull(skb, sizeof(he));
317 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
320 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
321 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
322 skb_pull(skb, sizeof(he_mu));
325 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
326 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
327 skb_pull(skb, sizeof(lsig));
330 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
331 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
332 /* rtap.len and rtap.pad are undone immediately */
333 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
337 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
340 rthdr = skb_push(skb, rtap_len);
341 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
342 it_present = &rthdr->it_present;
344 /* radiotap header, set always present flags */
345 rthdr->it_len = cpu_to_le16(rtap_len);
346 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
347 BIT(IEEE80211_RADIOTAP_CHANNEL) |
348 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
351 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
353 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
355 BIT(IEEE80211_RADIOTAP_EXT) |
356 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
357 put_unaligned_le32(it_present_val, it_present);
359 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
360 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
363 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
364 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
365 BIT(IEEE80211_RADIOTAP_EXT);
366 put_unaligned_le32(it_present_val, it_present);
368 it_present_val = rtap.present;
371 put_unaligned_le32(it_present_val, it_present);
373 /* This references through an offset into it_optional[] rather
374 * than via it_present otherwise later uses of pos will cause
375 * the compiler to think we have walked past the end of the
378 pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
380 /* the order of the following fields is important */
382 /* IEEE80211_RADIOTAP_TSFT */
383 if (ieee80211_have_rx_timestamp(status)) {
385 while ((pos - (u8 *)rthdr) & 7)
388 ieee80211_calculate_rx_timestamp(local, status,
391 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
395 /* IEEE80211_RADIOTAP_FLAGS */
396 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
397 *pos |= IEEE80211_RADIOTAP_F_FCS;
398 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
399 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
400 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
401 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
404 /* IEEE80211_RADIOTAP_RATE */
405 if (!rate || status->encoding != RX_ENC_LEGACY) {
407 * Without rate information don't add it. If we have,
408 * MCS information is a separate field in radiotap,
409 * added below. The byte here is needed as padding
410 * for the channel though, so initialise it to 0.
415 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
416 if (status->bw == RATE_INFO_BW_10)
418 else if (status->bw == RATE_INFO_BW_5)
420 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
424 /* IEEE80211_RADIOTAP_CHANNEL */
425 /* TODO: frequency offset in KHz */
426 put_unaligned_le16(status->freq, pos);
428 if (status->bw == RATE_INFO_BW_10)
429 channel_flags |= IEEE80211_CHAN_HALF;
430 else if (status->bw == RATE_INFO_BW_5)
431 channel_flags |= IEEE80211_CHAN_QUARTER;
433 if (status->band == NL80211_BAND_5GHZ ||
434 status->band == NL80211_BAND_6GHZ)
435 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
436 else if (status->encoding != RX_ENC_LEGACY)
437 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
438 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
439 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
441 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
443 channel_flags |= IEEE80211_CHAN_2GHZ;
444 put_unaligned_le16(channel_flags, pos);
447 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
448 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
449 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
450 *pos = status->signal;
452 cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
456 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
458 if (!status->chains) {
459 /* IEEE80211_RADIOTAP_ANTENNA */
460 *pos = status->antenna;
464 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
466 /* IEEE80211_RADIOTAP_RX_FLAGS */
467 /* ensure 2 byte alignment for the 2 byte field as required */
468 if ((pos - (u8 *)rthdr) & 1)
470 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
471 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
472 put_unaligned_le16(rx_flags, pos);
475 if (status->encoding == RX_ENC_HT) {
478 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
479 *pos = local->hw.radiotap_mcs_details;
480 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
481 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
482 if (status->enc_flags & RX_ENC_FLAG_LDPC)
483 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
486 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
487 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
488 if (status->bw == RATE_INFO_BW_40)
489 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
490 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
491 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
492 if (status->enc_flags & RX_ENC_FLAG_LDPC)
493 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
494 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
495 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
497 *pos++ = status->rate_idx;
500 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
503 /* ensure 4 byte alignment */
504 while ((pos - (u8 *)rthdr) & 3)
507 cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
508 put_unaligned_le32(status->ampdu_reference, pos);
510 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
511 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
512 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
513 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
514 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
515 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
516 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
517 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
518 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
519 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
520 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
521 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
522 put_unaligned_le16(flags, pos);
524 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
525 *pos++ = status->ampdu_delimiter_crc;
531 if (status->encoding == RX_ENC_VHT) {
532 u16 known = local->hw.radiotap_vht_details;
534 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
535 put_unaligned_le16(known, pos);
538 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
539 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
540 /* in VHT, STBC is binary */
541 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
542 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
543 if (status->enc_flags & RX_ENC_FLAG_BF)
544 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
547 switch (status->bw) {
548 case RATE_INFO_BW_80:
551 case RATE_INFO_BW_160:
554 case RATE_INFO_BW_40:
561 *pos = (status->rate_idx << 4) | status->nss;
564 if (status->enc_flags & RX_ENC_FLAG_LDPC)
565 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
573 if (local->hw.radiotap_timestamp.units_pos >= 0) {
575 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
578 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
580 /* ensure 8 byte alignment */
581 while ((pos - (u8 *)rthdr) & 7)
584 put_unaligned_le64(status->device_timestamp, pos);
587 if (local->hw.radiotap_timestamp.accuracy >= 0) {
588 accuracy = local->hw.radiotap_timestamp.accuracy;
589 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
591 put_unaligned_le16(accuracy, pos);
594 *pos++ = local->hw.radiotap_timestamp.units_pos;
598 if (status->encoding == RX_ENC_HE &&
599 status->flag & RX_FLAG_RADIOTAP_HE) {
600 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
602 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
603 he.data6 |= HE_PREP(DATA6_NSTS,
604 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
606 he.data3 |= HE_PREP(DATA3_STBC, 1);
608 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
611 #define CHECK_GI(s) \
612 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
613 (int)NL80211_RATE_INFO_HE_GI_##s)
619 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
620 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
621 he.data3 |= HE_PREP(DATA3_CODING,
622 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
624 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
626 switch (status->bw) {
627 case RATE_INFO_BW_20:
628 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
629 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
631 case RATE_INFO_BW_40:
632 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
633 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
635 case RATE_INFO_BW_80:
636 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
637 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
639 case RATE_INFO_BW_160:
640 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
641 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
643 case RATE_INFO_BW_HE_RU:
644 #define CHECK_RU_ALLOC(s) \
645 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
646 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
654 CHECK_RU_ALLOC(2x996);
656 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
660 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
663 /* ensure 2 byte alignment */
664 while ((pos - (u8 *)rthdr) & 1)
666 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
667 memcpy(pos, &he, sizeof(he));
671 if (status->encoding == RX_ENC_HE &&
672 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
673 /* ensure 2 byte alignment */
674 while ((pos - (u8 *)rthdr) & 1)
676 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
677 memcpy(pos, &he_mu, sizeof(he_mu));
678 pos += sizeof(he_mu);
681 if (status->flag & RX_FLAG_NO_PSDU) {
683 cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
684 *pos++ = status->zero_length_psdu_type;
687 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
688 /* ensure 2 byte alignment */
689 while ((pos - (u8 *)rthdr) & 1)
691 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
692 memcpy(pos, &lsig, sizeof(lsig));
696 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
697 *pos++ = status->chain_signal[chain];
701 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
702 /* ensure 2 byte alignment for the vendor field as required */
703 if ((pos - (u8 *)rthdr) & 1)
705 *pos++ = rtap.oui[0];
706 *pos++ = rtap.oui[1];
707 *pos++ = rtap.oui[2];
709 put_unaligned_le16(rtap.len, pos);
711 /* align the actual payload as requested */
712 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
714 /* data (and possible padding) already follows */
718 static struct sk_buff *
719 ieee80211_make_monitor_skb(struct ieee80211_local *local,
720 struct sk_buff **origskb,
721 struct ieee80211_rate *rate,
722 int rtap_space, bool use_origskb)
724 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
725 int rt_hdrlen, needed_headroom;
728 /* room for the radiotap header based on driver features */
729 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
730 needed_headroom = rt_hdrlen - rtap_space;
733 /* only need to expand headroom if necessary */
738 * This shouldn't trigger often because most devices have an
739 * RX header they pull before we get here, and that should
740 * be big enough for our radiotap information. We should
741 * probably export the length to drivers so that we can have
742 * them allocate enough headroom to start with.
744 if (skb_headroom(skb) < needed_headroom &&
745 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
751 * Need to make a copy and possibly remove radiotap header
752 * and FCS from the original.
754 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
761 /* prepend radiotap information */
762 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
764 skb_reset_mac_header(skb);
765 skb->ip_summed = CHECKSUM_UNNECESSARY;
766 skb->pkt_type = PACKET_OTHERHOST;
767 skb->protocol = htons(ETH_P_802_2);
773 * This function copies a received frame to all monitor interfaces and
774 * returns a cleaned-up SKB that no longer includes the FCS nor the
775 * radiotap header the driver might have added.
777 static struct sk_buff *
778 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
779 struct ieee80211_rate *rate)
781 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
782 struct ieee80211_sub_if_data *sdata;
783 struct sk_buff *monskb = NULL;
784 int present_fcs_len = 0;
785 unsigned int rtap_space = 0;
786 struct ieee80211_sub_if_data *monitor_sdata =
787 rcu_dereference(local->monitor_sdata);
788 bool only_monitor = false;
789 unsigned int min_head_len;
791 if (status->flag & RX_FLAG_RADIOTAP_HE)
792 rtap_space += sizeof(struct ieee80211_radiotap_he);
794 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
795 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
797 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
798 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
800 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
801 struct ieee80211_vendor_radiotap *rtap =
802 (void *)(origskb->data + rtap_space);
804 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
807 min_head_len = rtap_space;
810 * First, we may need to make a copy of the skb because
811 * (1) we need to modify it for radiotap (if not present), and
812 * (2) the other RX handlers will modify the skb we got.
814 * We don't need to, of course, if we aren't going to return
815 * the SKB because it has a bad FCS/PLCP checksum.
818 if (!(status->flag & RX_FLAG_NO_PSDU)) {
819 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
820 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
823 dev_kfree_skb(origskb);
826 present_fcs_len = FCS_LEN;
829 /* also consider the hdr->frame_control */
833 /* ensure that the expected data elements are in skb head */
834 if (!pskb_may_pull(origskb, min_head_len)) {
835 dev_kfree_skb(origskb);
839 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
841 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
843 dev_kfree_skb(origskb);
847 return ieee80211_clean_skb(origskb, present_fcs_len,
851 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
853 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
854 bool last_monitor = list_is_last(&sdata->u.mntr.list,
858 monskb = ieee80211_make_monitor_skb(local, &origskb,
870 skb = skb_clone(monskb, GFP_ATOMIC);
874 skb->dev = sdata->dev;
875 dev_sw_netstats_rx_add(skb->dev, skb->len);
876 netif_receive_skb(skb);
884 /* this happens if last_monitor was erroneously false */
885 dev_kfree_skb(monskb);
891 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
894 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
896 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
898 int tid, seqno_idx, security_idx;
900 /* does the frame have a qos control field? */
901 if (ieee80211_is_data_qos(hdr->frame_control)) {
902 u8 *qc = ieee80211_get_qos_ctl(hdr);
903 /* frame has qos control */
904 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
905 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
906 status->rx_flags |= IEEE80211_RX_AMSDU;
912 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
914 * Sequence numbers for management frames, QoS data
915 * frames with a broadcast/multicast address in the
916 * Address 1 field, and all non-QoS data frames sent
917 * by QoS STAs are assigned using an additional single
918 * modulo-4096 counter, [...]
920 * We also use that counter for non-QoS STAs.
922 seqno_idx = IEEE80211_NUM_TIDS;
924 if (ieee80211_is_mgmt(hdr->frame_control))
925 security_idx = IEEE80211_NUM_TIDS;
929 rx->seqno_idx = seqno_idx;
930 rx->security_idx = security_idx;
931 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
932 * For now, set skb->priority to 0 for other cases. */
933 rx->skb->priority = (tid > 7) ? 0 : tid;
937 * DOC: Packet alignment
939 * Drivers always need to pass packets that are aligned to two-byte boundaries
942 * Additionally, should, if possible, align the payload data in a way that
943 * guarantees that the contained IP header is aligned to a four-byte
944 * boundary. In the case of regular frames, this simply means aligning the
945 * payload to a four-byte boundary (because either the IP header is directly
946 * contained, or IV/RFC1042 headers that have a length divisible by four are
947 * in front of it). If the payload data is not properly aligned and the
948 * architecture doesn't support efficient unaligned operations, mac80211
949 * will align the data.
951 * With A-MSDU frames, however, the payload data address must yield two modulo
952 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
953 * push the IP header further back to a multiple of four again. Thankfully, the
954 * specs were sane enough this time around to require padding each A-MSDU
955 * subframe to a length that is a multiple of four.
957 * Padding like Atheros hardware adds which is between the 802.11 header and
958 * the payload is not supported, the driver is required to move the 802.11
959 * header to be directly in front of the payload in that case.
961 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
963 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
964 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
971 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
973 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
975 if (is_multicast_ether_addr(hdr->addr1))
978 return ieee80211_is_robust_mgmt_frame(skb);
982 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
984 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
986 if (!is_multicast_ether_addr(hdr->addr1))
989 return ieee80211_is_robust_mgmt_frame(skb);
993 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
994 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
996 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
997 struct ieee80211_mmie *mmie;
998 struct ieee80211_mmie_16 *mmie16;
1000 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
1003 if (!ieee80211_is_robust_mgmt_frame(skb) &&
1004 !ieee80211_is_beacon(hdr->frame_control))
1005 return -1; /* not a robust management frame */
1007 mmie = (struct ieee80211_mmie *)
1008 (skb->data + skb->len - sizeof(*mmie));
1009 if (mmie->element_id == WLAN_EID_MMIE &&
1010 mmie->length == sizeof(*mmie) - 2)
1011 return le16_to_cpu(mmie->key_id);
1013 mmie16 = (struct ieee80211_mmie_16 *)
1014 (skb->data + skb->len - sizeof(*mmie16));
1015 if (skb->len >= 24 + sizeof(*mmie16) &&
1016 mmie16->element_id == WLAN_EID_MMIE &&
1017 mmie16->length == sizeof(*mmie16) - 2)
1018 return le16_to_cpu(mmie16->key_id);
1023 static int ieee80211_get_keyid(struct sk_buff *skb)
1025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1026 __le16 fc = hdr->frame_control;
1027 int hdrlen = ieee80211_hdrlen(fc);
1030 /* WEP, TKIP, CCMP and GCMP */
1031 if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
1034 skb_copy_bits(skb, hdrlen + 3, &keyid, 1);
1041 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1043 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1044 char *dev_addr = rx->sdata->vif.addr;
1046 if (ieee80211_is_data(hdr->frame_control)) {
1047 if (is_multicast_ether_addr(hdr->addr1)) {
1048 if (ieee80211_has_tods(hdr->frame_control) ||
1049 !ieee80211_has_fromds(hdr->frame_control))
1050 return RX_DROP_MONITOR;
1051 if (ether_addr_equal(hdr->addr3, dev_addr))
1052 return RX_DROP_MONITOR;
1054 if (!ieee80211_has_a4(hdr->frame_control))
1055 return RX_DROP_MONITOR;
1056 if (ether_addr_equal(hdr->addr4, dev_addr))
1057 return RX_DROP_MONITOR;
1061 /* If there is not an established peer link and this is not a peer link
1062 * establisment frame, beacon or probe, drop the frame.
1065 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1066 struct ieee80211_mgmt *mgmt;
1068 if (!ieee80211_is_mgmt(hdr->frame_control))
1069 return RX_DROP_MONITOR;
1071 if (ieee80211_is_action(hdr->frame_control)) {
1074 /* make sure category field is present */
1075 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1076 return RX_DROP_MONITOR;
1078 mgmt = (struct ieee80211_mgmt *)hdr;
1079 category = mgmt->u.action.category;
1080 if (category != WLAN_CATEGORY_MESH_ACTION &&
1081 category != WLAN_CATEGORY_SELF_PROTECTED)
1082 return RX_DROP_MONITOR;
1086 if (ieee80211_is_probe_req(hdr->frame_control) ||
1087 ieee80211_is_probe_resp(hdr->frame_control) ||
1088 ieee80211_is_beacon(hdr->frame_control) ||
1089 ieee80211_is_auth(hdr->frame_control))
1092 return RX_DROP_MONITOR;
1098 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1101 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1102 struct sk_buff *tail = skb_peek_tail(frames);
1103 struct ieee80211_rx_status *status;
1105 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1111 status = IEEE80211_SKB_RXCB(tail);
1112 if (status->flag & RX_FLAG_AMSDU_MORE)
1118 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1119 struct tid_ampdu_rx *tid_agg_rx,
1121 struct sk_buff_head *frames)
1123 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1124 struct sk_buff *skb;
1125 struct ieee80211_rx_status *status;
1127 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1129 if (skb_queue_empty(skb_list))
1132 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1133 __skb_queue_purge(skb_list);
1137 /* release frames from the reorder ring buffer */
1138 tid_agg_rx->stored_mpdu_num--;
1139 while ((skb = __skb_dequeue(skb_list))) {
1140 status = IEEE80211_SKB_RXCB(skb);
1141 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1142 __skb_queue_tail(frames, skb);
1146 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1147 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1150 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1151 struct tid_ampdu_rx *tid_agg_rx,
1153 struct sk_buff_head *frames)
1157 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1159 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1160 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1161 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1167 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1168 * the skb was added to the buffer longer than this time ago, the earlier
1169 * frames that have not yet been received are assumed to be lost and the skb
1170 * can be released for processing. This may also release other skb's from the
1171 * reorder buffer if there are no additional gaps between the frames.
1173 * Callers must hold tid_agg_rx->reorder_lock.
1175 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1177 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1178 struct tid_ampdu_rx *tid_agg_rx,
1179 struct sk_buff_head *frames)
1183 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1185 /* release the buffer until next missing frame */
1186 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1187 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1188 tid_agg_rx->stored_mpdu_num) {
1190 * No buffers ready to be released, but check whether any
1191 * frames in the reorder buffer have timed out.
1194 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1195 j = (j + 1) % tid_agg_rx->buf_size) {
1196 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1201 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1202 HT_RX_REORDER_BUF_TIMEOUT))
1203 goto set_release_timer;
1205 /* don't leave incomplete A-MSDUs around */
1206 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1207 i = (i + 1) % tid_agg_rx->buf_size)
1208 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1210 ht_dbg_ratelimited(sdata,
1211 "release an RX reorder frame due to timeout on earlier frames\n");
1212 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1216 * Increment the head seq# also for the skipped slots.
1218 tid_agg_rx->head_seq_num =
1219 (tid_agg_rx->head_seq_num +
1220 skipped) & IEEE80211_SN_MASK;
1223 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1224 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1226 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1229 if (tid_agg_rx->stored_mpdu_num) {
1230 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1232 for (; j != (index - 1) % tid_agg_rx->buf_size;
1233 j = (j + 1) % tid_agg_rx->buf_size) {
1234 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1240 if (!tid_agg_rx->removed)
1241 mod_timer(&tid_agg_rx->reorder_timer,
1242 tid_agg_rx->reorder_time[j] + 1 +
1243 HT_RX_REORDER_BUF_TIMEOUT);
1245 del_timer(&tid_agg_rx->reorder_timer);
1250 * As this function belongs to the RX path it must be under
1251 * rcu_read_lock protection. It returns false if the frame
1252 * can be processed immediately, true if it was consumed.
1254 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1255 struct tid_ampdu_rx *tid_agg_rx,
1256 struct sk_buff *skb,
1257 struct sk_buff_head *frames)
1259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1260 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1261 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1262 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1263 u16 head_seq_num, buf_size;
1267 spin_lock(&tid_agg_rx->reorder_lock);
1270 * Offloaded BA sessions have no known starting sequence number so pick
1271 * one from first Rxed frame for this tid after BA was started.
1273 if (unlikely(tid_agg_rx->auto_seq)) {
1274 tid_agg_rx->auto_seq = false;
1275 tid_agg_rx->ssn = mpdu_seq_num;
1276 tid_agg_rx->head_seq_num = mpdu_seq_num;
1279 buf_size = tid_agg_rx->buf_size;
1280 head_seq_num = tid_agg_rx->head_seq_num;
1283 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1286 if (unlikely(!tid_agg_rx->started)) {
1287 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1291 tid_agg_rx->started = true;
1294 /* frame with out of date sequence number */
1295 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1301 * If frame the sequence number exceeds our buffering window
1302 * size release some previous frames to make room for this one.
1304 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1305 head_seq_num = ieee80211_sn_inc(
1306 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1307 /* release stored frames up to new head to stack */
1308 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1309 head_seq_num, frames);
1312 /* Now the new frame is always in the range of the reordering buffer */
1314 index = mpdu_seq_num % tid_agg_rx->buf_size;
1316 /* check if we already stored this frame */
1317 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1323 * If the current MPDU is in the right order and nothing else
1324 * is stored we can process it directly, no need to buffer it.
1325 * If it is first but there's something stored, we may be able
1326 * to release frames after this one.
1328 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1329 tid_agg_rx->stored_mpdu_num == 0) {
1330 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1331 tid_agg_rx->head_seq_num =
1332 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1337 /* put the frame in the reordering buffer */
1338 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1339 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1340 tid_agg_rx->reorder_time[index] = jiffies;
1341 tid_agg_rx->stored_mpdu_num++;
1342 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1346 spin_unlock(&tid_agg_rx->reorder_lock);
1351 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1352 * true if the MPDU was buffered, false if it should be processed.
1354 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1355 struct sk_buff_head *frames)
1357 struct sk_buff *skb = rx->skb;
1358 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1359 struct sta_info *sta = rx->sta;
1360 struct tid_ampdu_rx *tid_agg_rx;
1364 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1365 is_multicast_ether_addr(hdr->addr1))
1369 * filter the QoS data rx stream according to
1370 * STA/TID and check if this STA/TID is on aggregation
1376 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1377 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1378 tid = ieee80211_get_tid(hdr);
1380 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1382 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1383 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1384 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1385 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1386 WLAN_BACK_RECIPIENT,
1387 WLAN_REASON_QSTA_REQUIRE_SETUP);
1391 /* qos null data frames are excluded */
1392 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1395 /* not part of a BA session */
1396 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1399 /* new, potentially un-ordered, ampdu frame - process it */
1401 /* reset session timer */
1402 if (tid_agg_rx->timeout)
1403 tid_agg_rx->last_rx = jiffies;
1405 /* if this mpdu is fragmented - terminate rx aggregation session */
1406 sc = le16_to_cpu(hdr->seq_ctrl);
1407 if (sc & IEEE80211_SCTL_FRAG) {
1408 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
1413 * No locking needed -- we will only ever process one
1414 * RX packet at a time, and thus own tid_agg_rx. All
1415 * other code manipulating it needs to (and does) make
1416 * sure that we cannot get to it any more before doing
1419 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1424 __skb_queue_tail(frames, skb);
1427 static ieee80211_rx_result debug_noinline
1428 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1431 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1433 if (status->flag & RX_FLAG_DUP_VALIDATED)
1437 * Drop duplicate 802.11 retransmissions
1438 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1441 if (rx->skb->len < 24)
1444 if (ieee80211_is_ctl(hdr->frame_control) ||
1445 ieee80211_is_any_nullfunc(hdr->frame_control) ||
1446 is_multicast_ether_addr(hdr->addr1))
1452 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1453 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1454 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1455 rx->link_sta->rx_stats.num_duplicates++;
1456 return RX_DROP_UNUSABLE;
1457 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1458 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1464 static ieee80211_rx_result debug_noinline
1465 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1467 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1469 /* Drop disallowed frame classes based on STA auth/assoc state;
1470 * IEEE 802.11, Chap 5.5.
1472 * mac80211 filters only based on association state, i.e. it drops
1473 * Class 3 frames from not associated stations. hostapd sends
1474 * deauth/disassoc frames when needed. In addition, hostapd is
1475 * responsible for filtering on both auth and assoc states.
1478 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1479 return ieee80211_rx_mesh_check(rx);
1481 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1482 ieee80211_is_pspoll(hdr->frame_control)) &&
1483 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1484 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1485 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1487 * accept port control frames from the AP even when it's not
1488 * yet marked ASSOC to prevent a race where we don't set the
1489 * assoc bit quickly enough before it sends the first frame
1491 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1492 ieee80211_is_data_present(hdr->frame_control)) {
1493 unsigned int hdrlen;
1496 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1498 if (rx->skb->len < hdrlen + 8)
1499 return RX_DROP_MONITOR;
1501 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1502 if (ethertype == rx->sdata->control_port_protocol)
1506 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1507 cfg80211_rx_spurious_frame(rx->sdata->dev,
1510 return RX_DROP_UNUSABLE;
1512 return RX_DROP_MONITOR;
1519 static ieee80211_rx_result debug_noinline
1520 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1522 struct ieee80211_local *local;
1523 struct ieee80211_hdr *hdr;
1524 struct sk_buff *skb;
1528 hdr = (struct ieee80211_hdr *) skb->data;
1530 if (!local->pspolling)
1533 if (!ieee80211_has_fromds(hdr->frame_control))
1534 /* this is not from AP */
1537 if (!ieee80211_is_data(hdr->frame_control))
1540 if (!ieee80211_has_moredata(hdr->frame_control)) {
1541 /* AP has no more frames buffered for us */
1542 local->pspolling = false;
1546 /* more data bit is set, let's request a new frame from the AP */
1547 ieee80211_send_pspoll(local, rx->sdata);
1552 static void sta_ps_start(struct sta_info *sta)
1554 struct ieee80211_sub_if_data *sdata = sta->sdata;
1555 struct ieee80211_local *local = sdata->local;
1559 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1560 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1561 ps = &sdata->bss->ps;
1565 atomic_inc(&ps->num_sta_ps);
1566 set_sta_flag(sta, WLAN_STA_PS_STA);
1567 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1568 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1569 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1570 sta->sta.addr, sta->sta.aid);
1572 ieee80211_clear_fast_xmit(sta);
1574 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1575 struct ieee80211_txq *txq = sta->sta.txq[tid];
1576 struct txq_info *txqi = to_txq_info(txq);
1578 spin_lock(&local->active_txq_lock[txq->ac]);
1579 if (!list_empty(&txqi->schedule_order))
1580 list_del_init(&txqi->schedule_order);
1581 spin_unlock(&local->active_txq_lock[txq->ac]);
1583 if (txq_has_queue(txq))
1584 set_bit(tid, &sta->txq_buffered_tids);
1586 clear_bit(tid, &sta->txq_buffered_tids);
1590 static void sta_ps_end(struct sta_info *sta)
1592 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1593 sta->sta.addr, sta->sta.aid);
1595 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1597 * Clear the flag only if the other one is still set
1598 * so that the TX path won't start TX'ing new frames
1599 * directly ... In the case that the driver flag isn't
1600 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1602 clear_sta_flag(sta, WLAN_STA_PS_STA);
1603 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1604 sta->sta.addr, sta->sta.aid);
1608 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1609 clear_sta_flag(sta, WLAN_STA_PS_STA);
1610 ieee80211_sta_ps_deliver_wakeup(sta);
1613 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1615 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1618 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1620 /* Don't let the same PS state be set twice */
1621 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1622 if ((start && in_ps) || (!start && !in_ps))
1632 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1634 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1636 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1638 if (test_sta_flag(sta, WLAN_STA_SP))
1641 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1642 ieee80211_sta_ps_deliver_poll_response(sta);
1644 set_sta_flag(sta, WLAN_STA_PSPOLL);
1646 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1648 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1650 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1651 int ac = ieee80211_ac_from_tid(tid);
1654 * If this AC is not trigger-enabled do nothing unless the
1655 * driver is calling us after it already checked.
1657 * NB: This could/should check a separate bitmap of trigger-
1658 * enabled queues, but for now we only implement uAPSD w/o
1659 * TSPEC changes to the ACs, so they're always the same.
1661 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1662 tid != IEEE80211_NUM_TIDS)
1665 /* if we are in a service period, do nothing */
1666 if (test_sta_flag(sta, WLAN_STA_SP))
1669 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1670 ieee80211_sta_ps_deliver_uapsd(sta);
1672 set_sta_flag(sta, WLAN_STA_UAPSD);
1674 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1676 static ieee80211_rx_result debug_noinline
1677 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1679 struct ieee80211_sub_if_data *sdata = rx->sdata;
1680 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1681 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1686 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1687 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1691 * The device handles station powersave, so don't do anything about
1692 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1693 * it to mac80211 since they're handled.)
1695 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1699 * Don't do anything if the station isn't already asleep. In
1700 * the uAPSD case, the station will probably be marked asleep,
1701 * in the PS-Poll case the station must be confused ...
1703 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1706 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1707 ieee80211_sta_pspoll(&rx->sta->sta);
1709 /* Free PS Poll skb here instead of returning RX_DROP that would
1710 * count as an dropped frame. */
1711 dev_kfree_skb(rx->skb);
1714 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1715 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1716 ieee80211_has_pm(hdr->frame_control) &&
1717 (ieee80211_is_data_qos(hdr->frame_control) ||
1718 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1719 u8 tid = ieee80211_get_tid(hdr);
1721 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1727 static ieee80211_rx_result debug_noinline
1728 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1730 struct sta_info *sta = rx->sta;
1731 struct link_sta_info *link_sta = rx->link_sta;
1732 struct sk_buff *skb = rx->skb;
1733 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1734 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1737 if (!sta || !link_sta)
1741 * Update last_rx only for IBSS packets which are for the current
1742 * BSSID and for station already AUTHORIZED to avoid keeping the
1743 * current IBSS network alive in cases where other STAs start
1744 * using different BSSID. This will also give the station another
1745 * chance to restart the authentication/authorization in case
1746 * something went wrong the first time.
1748 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1749 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1750 NL80211_IFTYPE_ADHOC);
1751 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1752 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1753 link_sta->rx_stats.last_rx = jiffies;
1754 if (ieee80211_is_data(hdr->frame_control) &&
1755 !is_multicast_ether_addr(hdr->addr1))
1756 link_sta->rx_stats.last_rate =
1757 sta_stats_encode_rate(status);
1759 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1760 link_sta->rx_stats.last_rx = jiffies;
1761 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1762 !is_multicast_ether_addr(hdr->addr1)) {
1764 * Mesh beacons will update last_rx when if they are found to
1765 * match the current local configuration when processed.
1767 link_sta->rx_stats.last_rx = jiffies;
1768 if (ieee80211_is_data(hdr->frame_control))
1769 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1772 link_sta->rx_stats.fragments++;
1774 u64_stats_update_begin(&link_sta->rx_stats.syncp);
1775 link_sta->rx_stats.bytes += rx->skb->len;
1776 u64_stats_update_end(&link_sta->rx_stats.syncp);
1778 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1779 link_sta->rx_stats.last_signal = status->signal;
1780 ewma_signal_add(&link_sta->rx_stats_avg.signal,
1784 if (status->chains) {
1785 link_sta->rx_stats.chains = status->chains;
1786 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1787 int signal = status->chain_signal[i];
1789 if (!(status->chains & BIT(i)))
1792 link_sta->rx_stats.chain_signal_last[i] = signal;
1793 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
1798 if (ieee80211_is_s1g_beacon(hdr->frame_control))
1802 * Change STA power saving mode only at the end of a frame
1803 * exchange sequence, and only for a data or management
1804 * frame as specified in IEEE 802.11-2016 11.2.3.2
1806 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1807 !ieee80211_has_morefrags(hdr->frame_control) &&
1808 !is_multicast_ether_addr(hdr->addr1) &&
1809 (ieee80211_is_mgmt(hdr->frame_control) ||
1810 ieee80211_is_data(hdr->frame_control)) &&
1811 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1812 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1813 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1814 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1815 if (!ieee80211_has_pm(hdr->frame_control))
1818 if (ieee80211_has_pm(hdr->frame_control))
1823 /* mesh power save support */
1824 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1825 ieee80211_mps_rx_h_sta_process(sta, hdr);
1828 * Drop (qos-)data::nullfunc frames silently, since they
1829 * are used only to control station power saving mode.
1831 if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1832 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1835 * If we receive a 4-addr nullfunc frame from a STA
1836 * that was not moved to a 4-addr STA vlan yet send
1837 * the event to userspace and for older hostapd drop
1838 * the frame to the monitor interface.
1840 if (ieee80211_has_a4(hdr->frame_control) &&
1841 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1842 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1843 !rx->sdata->u.vlan.sta))) {
1844 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1845 cfg80211_rx_unexpected_4addr_frame(
1846 rx->sdata->dev, sta->sta.addr,
1848 return RX_DROP_MONITOR;
1851 * Update counter and free packet here to avoid
1852 * counting this as a dropped packed.
1854 link_sta->rx_stats.packets++;
1855 dev_kfree_skb(rx->skb);
1860 } /* ieee80211_rx_h_sta_process */
1862 static struct ieee80211_key *
1863 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1865 struct ieee80211_key *key = NULL;
1868 /* Make sure key gets set if either BIGTK key index is set so that
1869 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1870 * Beacon frames and Beacon frames that claim to use another BIGTK key
1871 * index (i.e., a key that we do not have).
1875 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1878 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1885 key = rcu_dereference(rx->link_sta->gtk[idx]);
1887 key = rcu_dereference(rx->link->gtk[idx]);
1888 if (!key && rx->link_sta)
1889 key = rcu_dereference(rx->link_sta->gtk[idx2]);
1891 key = rcu_dereference(rx->link->gtk[idx2]);
1896 static ieee80211_rx_result debug_noinline
1897 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1899 struct sk_buff *skb = rx->skb;
1900 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1903 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1904 struct ieee80211_key *sta_ptk = NULL;
1905 struct ieee80211_key *ptk_idx = NULL;
1906 int mmie_keyidx = -1;
1909 if (ieee80211_is_ext(hdr->frame_control))
1915 * There are five types of keys:
1916 * - GTK (group keys)
1917 * - IGTK (group keys for management frames)
1918 * - BIGTK (group keys for Beacon frames)
1919 * - PTK (pairwise keys)
1920 * - STK (station-to-station pairwise keys)
1922 * When selecting a key, we have to distinguish between multicast
1923 * (including broadcast) and unicast frames, the latter can only
1924 * use PTKs and STKs while the former always use GTKs, IGTKs, and
1925 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1926 * then unicast frames can also use key indices like GTKs. Hence, if we
1927 * don't have a PTK/STK we check the key index for a WEP key.
1929 * Note that in a regular BSS, multicast frames are sent by the
1930 * AP only, associated stations unicast the frame to the AP first
1931 * which then multicasts it on their behalf.
1933 * There is also a slight problem in IBSS mode: GTKs are negotiated
1934 * with each station, that is something we don't currently handle.
1935 * The spec seems to expect that one negotiates the same key with
1936 * every station but there's no such requirement; VLANs could be
1940 /* start without a key */
1942 fc = hdr->frame_control;
1945 int keyid = rx->sta->ptk_idx;
1946 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1948 if (ieee80211_has_protected(fc) &&
1949 !(status->flag & RX_FLAG_IV_STRIPPED)) {
1950 keyid = ieee80211_get_keyid(rx->skb);
1952 if (unlikely(keyid < 0))
1953 return RX_DROP_UNUSABLE;
1955 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1959 if (!ieee80211_has_protected(fc))
1960 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1962 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1963 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1964 if ((status->flag & RX_FLAG_DECRYPTED) &&
1965 (status->flag & RX_FLAG_IV_STRIPPED))
1967 /* Skip decryption if the frame is not protected. */
1968 if (!ieee80211_has_protected(fc))
1970 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1971 /* Broadcast/multicast robust management frame / BIP */
1972 if ((status->flag & RX_FLAG_DECRYPTED) &&
1973 (status->flag & RX_FLAG_IV_STRIPPED))
1976 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1977 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1978 NUM_DEFAULT_BEACON_KEYS) {
1980 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1983 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1986 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1988 return RX_CONTINUE; /* Beacon protection not in use */
1989 } else if (mmie_keyidx >= 0) {
1990 /* Broadcast/multicast robust management frame / BIP */
1991 if ((status->flag & RX_FLAG_DECRYPTED) &&
1992 (status->flag & RX_FLAG_IV_STRIPPED))
1995 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1996 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1997 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1999 if (ieee80211_is_group_privacy_action(skb) &&
2000 test_sta_flag(rx->sta, WLAN_STA_MFP))
2001 return RX_DROP_MONITOR;
2003 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
2006 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
2007 } else if (!ieee80211_has_protected(fc)) {
2009 * The frame was not protected, so skip decryption. However, we
2010 * need to set rx->key if there is a key that could have been
2011 * used so that the frame may be dropped if encryption would
2012 * have been expected.
2014 struct ieee80211_key *key = NULL;
2017 if (ieee80211_is_beacon(fc)) {
2018 key = ieee80211_rx_get_bigtk(rx, -1);
2019 } else if (ieee80211_is_mgmt(fc) &&
2020 is_multicast_ether_addr(hdr->addr1)) {
2021 key = rcu_dereference(rx->link->default_mgmt_key);
2024 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2025 key = rcu_dereference(rx->link_sta->gtk[i]);
2031 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2032 key = rcu_dereference(rx->link->gtk[i]);
2043 * The device doesn't give us the IV so we won't be
2044 * able to look up the key. That's ok though, we
2045 * don't need to decrypt the frame, we just won't
2046 * be able to keep statistics accurate.
2047 * Except for key threshold notifications, should
2048 * we somehow allow the driver to tell us which key
2049 * the hardware used if this flag is set?
2051 if ((status->flag & RX_FLAG_DECRYPTED) &&
2052 (status->flag & RX_FLAG_IV_STRIPPED))
2055 keyidx = ieee80211_get_keyid(rx->skb);
2057 if (unlikely(keyidx < 0))
2058 return RX_DROP_UNUSABLE;
2060 /* check per-station GTK first, if multicast packet */
2061 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
2062 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2064 /* if not found, try default key */
2066 if (is_multicast_ether_addr(hdr->addr1))
2067 rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2069 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2072 * RSNA-protected unicast frames should always be
2073 * sent with pairwise or station-to-station keys,
2074 * but for WEP we allow using a key index as well.
2077 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2078 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2079 !is_multicast_ether_addr(hdr->addr1))
2085 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2086 return RX_DROP_MONITOR;
2088 /* TODO: add threshold stuff again */
2090 return RX_DROP_MONITOR;
2093 switch (rx->key->conf.cipher) {
2094 case WLAN_CIPHER_SUITE_WEP40:
2095 case WLAN_CIPHER_SUITE_WEP104:
2096 result = ieee80211_crypto_wep_decrypt(rx);
2098 case WLAN_CIPHER_SUITE_TKIP:
2099 result = ieee80211_crypto_tkip_decrypt(rx);
2101 case WLAN_CIPHER_SUITE_CCMP:
2102 result = ieee80211_crypto_ccmp_decrypt(
2103 rx, IEEE80211_CCMP_MIC_LEN);
2105 case WLAN_CIPHER_SUITE_CCMP_256:
2106 result = ieee80211_crypto_ccmp_decrypt(
2107 rx, IEEE80211_CCMP_256_MIC_LEN);
2109 case WLAN_CIPHER_SUITE_AES_CMAC:
2110 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2112 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2113 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2115 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2116 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2117 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2119 case WLAN_CIPHER_SUITE_GCMP:
2120 case WLAN_CIPHER_SUITE_GCMP_256:
2121 result = ieee80211_crypto_gcmp_decrypt(rx);
2124 result = RX_DROP_UNUSABLE;
2127 /* the hdr variable is invalid after the decrypt handlers */
2129 /* either the frame has been decrypted or will be dropped */
2130 status->flag |= RX_FLAG_DECRYPTED;
2132 if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
2134 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2135 skb->data, skb->len);
2140 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2144 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2145 skb_queue_head_init(&cache->entries[i].skb_list);
2148 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2152 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2153 __skb_queue_purge(&cache->entries[i].skb_list);
2156 static inline struct ieee80211_fragment_entry *
2157 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2158 unsigned int frag, unsigned int seq, int rx_queue,
2159 struct sk_buff **skb)
2161 struct ieee80211_fragment_entry *entry;
2163 entry = &cache->entries[cache->next++];
2164 if (cache->next >= IEEE80211_FRAGMENT_MAX)
2167 __skb_queue_purge(&entry->skb_list);
2169 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2171 entry->first_frag_time = jiffies;
2173 entry->rx_queue = rx_queue;
2174 entry->last_frag = frag;
2175 entry->check_sequential_pn = false;
2176 entry->extra_len = 0;
2181 static inline struct ieee80211_fragment_entry *
2182 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2183 unsigned int frag, unsigned int seq,
2184 int rx_queue, struct ieee80211_hdr *hdr)
2186 struct ieee80211_fragment_entry *entry;
2190 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2191 struct ieee80211_hdr *f_hdr;
2192 struct sk_buff *f_skb;
2196 idx = IEEE80211_FRAGMENT_MAX - 1;
2198 entry = &cache->entries[idx];
2199 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2200 entry->rx_queue != rx_queue ||
2201 entry->last_frag + 1 != frag)
2204 f_skb = __skb_peek(&entry->skb_list);
2205 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2208 * Check ftype and addresses are equal, else check next fragment
2210 if (((hdr->frame_control ^ f_hdr->frame_control) &
2211 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2212 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2213 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2216 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2217 __skb_queue_purge(&entry->skb_list);
2226 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2229 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2230 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2231 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2232 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2233 ieee80211_has_protected(fc);
2236 static ieee80211_rx_result debug_noinline
2237 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2239 struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2240 struct ieee80211_hdr *hdr;
2243 unsigned int frag, seq;
2244 struct ieee80211_fragment_entry *entry;
2245 struct sk_buff *skb;
2246 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2248 hdr = (struct ieee80211_hdr *)rx->skb->data;
2249 fc = hdr->frame_control;
2251 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2254 sc = le16_to_cpu(hdr->seq_ctrl);
2255 frag = sc & IEEE80211_SCTL_FRAG;
2258 cache = &rx->sta->frags;
2260 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2263 if (is_multicast_ether_addr(hdr->addr1))
2264 return RX_DROP_MONITOR;
2266 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2268 if (skb_linearize(rx->skb))
2269 return RX_DROP_UNUSABLE;
2272 * skb_linearize() might change the skb->data and
2273 * previously cached variables (in this case, hdr) need to
2274 * be refreshed with the new data.
2276 hdr = (struct ieee80211_hdr *)rx->skb->data;
2277 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2280 /* This is the first fragment of a new frame. */
2281 entry = ieee80211_reassemble_add(cache, frag, seq,
2282 rx->seqno_idx, &(rx->skb));
2283 if (requires_sequential_pn(rx, fc)) {
2284 int queue = rx->security_idx;
2286 /* Store CCMP/GCMP PN so that we can verify that the
2287 * next fragment has a sequential PN value.
2289 entry->check_sequential_pn = true;
2290 entry->is_protected = true;
2291 entry->key_color = rx->key->color;
2292 memcpy(entry->last_pn,
2293 rx->key->u.ccmp.rx_pn[queue],
2294 IEEE80211_CCMP_PN_LEN);
2295 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2297 offsetof(struct ieee80211_key,
2299 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2300 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2301 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2302 IEEE80211_GCMP_PN_LEN);
2303 } else if (rx->key &&
2304 (ieee80211_has_protected(fc) ||
2305 (status->flag & RX_FLAG_DECRYPTED))) {
2306 entry->is_protected = true;
2307 entry->key_color = rx->key->color;
2312 /* This is a fragment for a frame that should already be pending in
2313 * fragment cache. Add this fragment to the end of the pending entry.
2315 entry = ieee80211_reassemble_find(cache, frag, seq,
2316 rx->seqno_idx, hdr);
2318 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2319 return RX_DROP_MONITOR;
2322 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2323 * MPDU PN values are not incrementing in steps of 1."
2324 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2325 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2327 if (entry->check_sequential_pn) {
2329 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2331 if (!requires_sequential_pn(rx, fc))
2332 return RX_DROP_UNUSABLE;
2334 /* Prevent mixed key and fragment cache attacks */
2335 if (entry->key_color != rx->key->color)
2336 return RX_DROP_UNUSABLE;
2338 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2339 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2345 rpn = rx->ccm_gcm.pn;
2346 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2347 return RX_DROP_UNUSABLE;
2348 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2349 } else if (entry->is_protected &&
2351 (!ieee80211_has_protected(fc) &&
2352 !(status->flag & RX_FLAG_DECRYPTED)) ||
2353 rx->key->color != entry->key_color)) {
2354 /* Drop this as a mixed key or fragment cache attack, even
2355 * if for TKIP Michael MIC should protect us, and WEP is a
2356 * lost cause anyway.
2358 return RX_DROP_UNUSABLE;
2359 } else if (entry->is_protected && rx->key &&
2360 entry->key_color != rx->key->color &&
2361 (status->flag & RX_FLAG_DECRYPTED)) {
2362 return RX_DROP_UNUSABLE;
2365 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2366 __skb_queue_tail(&entry->skb_list, rx->skb);
2367 entry->last_frag = frag;
2368 entry->extra_len += rx->skb->len;
2369 if (ieee80211_has_morefrags(fc)) {
2374 rx->skb = __skb_dequeue(&entry->skb_list);
2375 if (skb_tailroom(rx->skb) < entry->extra_len) {
2376 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2377 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2379 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2380 __skb_queue_purge(&entry->skb_list);
2381 return RX_DROP_UNUSABLE;
2384 while ((skb = __skb_dequeue(&entry->skb_list))) {
2385 skb_put_data(rx->skb, skb->data, skb->len);
2390 ieee80211_led_rx(rx->local);
2392 rx->link_sta->rx_stats.packets++;
2396 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2398 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2404 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2406 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2407 struct sk_buff *skb = rx->skb;
2408 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2411 * Pass through unencrypted frames if the hardware has
2412 * decrypted them already.
2414 if (status->flag & RX_FLAG_DECRYPTED)
2417 /* check mesh EAPOL frames first */
2418 if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2419 ieee80211_is_data(fc))) {
2420 struct ieee80211s_hdr *mesh_hdr;
2421 u16 hdr_len = ieee80211_hdrlen(fc);
2422 u16 ethertype_offset;
2425 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2428 /* make sure fixed part of mesh header is there, also checks skb len */
2429 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2432 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2433 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2434 sizeof(rfc1042_header);
2436 if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 &&
2437 ethertype == rx->sdata->control_port_protocol)
2442 /* Drop unencrypted frames if key is set. */
2443 if (unlikely(!ieee80211_has_protected(fc) &&
2444 !ieee80211_is_any_nullfunc(fc) &&
2445 ieee80211_is_data(fc) && rx->key))
2451 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2454 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2455 __le16 fc = hdr->frame_control;
2458 * Pass through unencrypted frames if the hardware has
2459 * decrypted them already.
2461 if (status->flag & RX_FLAG_DECRYPTED)
2464 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2465 if (unlikely(!ieee80211_has_protected(fc) &&
2466 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2468 if (ieee80211_is_deauth(fc) ||
2469 ieee80211_is_disassoc(fc))
2470 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2475 /* BIP does not use Protected field, so need to check MMIE */
2476 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2477 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2478 if (ieee80211_is_deauth(fc) ||
2479 ieee80211_is_disassoc(fc))
2480 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2485 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2486 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2487 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2493 * When using MFP, Action frames are not allowed prior to
2494 * having configured keys.
2496 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2497 ieee80211_is_robust_mgmt_frame(rx->skb)))
2505 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2507 struct ieee80211_sub_if_data *sdata = rx->sdata;
2508 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2509 bool check_port_control = false;
2510 struct ethhdr *ehdr;
2513 *port_control = false;
2514 if (ieee80211_has_a4(hdr->frame_control) &&
2515 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2518 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2519 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2521 if (!sdata->u.mgd.use_4addr)
2523 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2524 check_port_control = true;
2527 if (is_multicast_ether_addr(hdr->addr1) &&
2528 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2531 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2535 ehdr = (struct ethhdr *) rx->skb->data;
2536 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2537 *port_control = true;
2538 else if (check_port_control)
2544 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2545 const u8 *addr, int *out_link_id)
2547 unsigned int link_id;
2549 /* non-MLO, or MLD address replaced by hardware */
2550 if (ether_addr_equal(sdata->vif.addr, addr))
2553 if (!sdata->vif.valid_links)
2556 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2557 struct ieee80211_bss_conf *conf;
2559 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2563 if (ether_addr_equal(conf->addr, addr)) {
2565 *out_link_id = link_id;
2574 * requires that rx->skb is a frame with ethernet header
2576 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2578 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2579 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2580 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2583 * Allow EAPOL frames to us/the PAE group address regardless of
2584 * whether the frame was encrypted or not, and always disallow
2585 * all other destination addresses for them.
2587 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2588 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
2589 ether_addr_equal(ehdr->h_dest, pae_group_addr);
2591 if (ieee80211_802_1x_port_control(rx) ||
2592 ieee80211_drop_unencrypted(rx, fc))
2598 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2599 struct ieee80211_rx_data *rx)
2601 struct ieee80211_sub_if_data *sdata = rx->sdata;
2602 struct net_device *dev = sdata->dev;
2604 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2605 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2606 !sdata->control_port_no_preauth)) &&
2607 sdata->control_port_over_nl80211)) {
2608 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2609 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2611 cfg80211_rx_control_port(dev, skb, noencrypt);
2614 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2616 memset(skb->cb, 0, sizeof(skb->cb));
2619 * 802.1X over 802.11 requires that the authenticator address
2620 * be used for EAPOL frames. However, 802.1X allows the use of
2621 * the PAE group address instead. If the interface is part of
2622 * a bridge and we pass the frame with the PAE group address,
2623 * then the bridge will forward it to the network (even if the
2624 * client was not associated yet), which isn't supposed to
2626 * To avoid that, rewrite the destination address to our own
2627 * address, so that the authenticator (e.g. hostapd) will see
2628 * the frame, but bridge won't forward it anywhere else. Note
2629 * that due to earlier filtering, the only other address can
2630 * be the PAE group address, unless the hardware allowed them
2631 * through in 802.3 offloaded mode.
2633 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2634 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2635 ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2637 /* deliver to local stack */
2639 list_add_tail(&skb->list, rx->list);
2641 netif_receive_skb(skb);
2646 * requires that rx->skb is a frame with ethernet header
2649 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2651 struct ieee80211_sub_if_data *sdata = rx->sdata;
2652 struct net_device *dev = sdata->dev;
2653 struct sk_buff *skb, *xmit_skb;
2654 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2655 struct sta_info *dsta;
2660 dev_sw_netstats_rx_add(dev, skb->len);
2663 /* The seqno index has the same property as needed
2664 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2665 * for non-QoS-data frames. Here we know it's a data
2666 * frame, so count MSDUs.
2668 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp);
2669 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2670 u64_stats_update_end(&rx->link_sta->rx_stats.syncp);
2673 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2674 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2675 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2676 ehdr->h_proto != rx->sdata->control_port_protocol &&
2677 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2678 if (is_multicast_ether_addr(ehdr->h_dest) &&
2679 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2681 * send multicast frames both to higher layers in
2682 * local net stack and back to the wireless medium
2684 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2686 net_info_ratelimited("%s: failed to clone multicast frame\n",
2688 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2689 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2690 dsta = sta_info_get(sdata, ehdr->h_dest);
2693 * The destination station is associated to
2694 * this AP (in this VLAN), so send the frame
2695 * directly to it and do not pass it to local
2704 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2706 /* 'align' will only take the values 0 or 2 here since all
2707 * frames are required to be aligned to 2-byte boundaries
2708 * when being passed to mac80211; the code here works just
2709 * as well if that isn't true, but mac80211 assumes it can
2710 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2714 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2716 if (WARN_ON(skb_headroom(skb) < 3)) {
2720 u8 *data = skb->data;
2721 size_t len = skb_headlen(skb);
2723 memmove(skb->data, data, len);
2724 skb_set_tail_pointer(skb, len);
2731 skb->protocol = eth_type_trans(skb, dev);
2732 ieee80211_deliver_skb_to_local_stack(skb, rx);
2737 * Send to wireless media and increase priority by 256 to
2738 * keep the received priority instead of reclassifying
2739 * the frame (see cfg80211_classify8021d).
2741 xmit_skb->priority += 256;
2742 xmit_skb->protocol = htons(ETH_P_802_3);
2743 skb_reset_network_header(xmit_skb);
2744 skb_reset_mac_header(xmit_skb);
2745 dev_queue_xmit(xmit_skb);
2749 static ieee80211_rx_result debug_noinline
2750 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2752 struct net_device *dev = rx->sdata->dev;
2753 struct sk_buff *skb = rx->skb;
2754 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2755 __le16 fc = hdr->frame_control;
2756 struct sk_buff_head frame_list;
2757 struct ethhdr ethhdr;
2758 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2760 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2763 } else switch (rx->sdata->vif.type) {
2764 case NL80211_IFTYPE_AP:
2765 case NL80211_IFTYPE_AP_VLAN:
2768 case NL80211_IFTYPE_STATION:
2770 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2773 case NL80211_IFTYPE_MESH_POINT:
2781 __skb_queue_head_init(&frame_list);
2783 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2784 rx->sdata->vif.addr,
2785 rx->sdata->vif.type,
2787 return RX_DROP_UNUSABLE;
2789 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2790 rx->sdata->vif.type,
2791 rx->local->hw.extra_tx_headroom,
2792 check_da, check_sa);
2794 while (!skb_queue_empty(&frame_list)) {
2795 rx->skb = __skb_dequeue(&frame_list);
2797 if (!ieee80211_frame_allowed(rx, fc)) {
2798 dev_kfree_skb(rx->skb);
2802 ieee80211_deliver_skb(rx);
2808 static ieee80211_rx_result debug_noinline
2809 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2811 struct sk_buff *skb = rx->skb;
2812 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2813 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2814 __le16 fc = hdr->frame_control;
2816 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2819 if (unlikely(!ieee80211_is_data(fc)))
2822 if (unlikely(!ieee80211_is_data_present(fc)))
2823 return RX_DROP_MONITOR;
2825 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2826 switch (rx->sdata->vif.type) {
2827 case NL80211_IFTYPE_AP_VLAN:
2828 if (!rx->sdata->u.vlan.sta)
2829 return RX_DROP_UNUSABLE;
2831 case NL80211_IFTYPE_STATION:
2832 if (!rx->sdata->u.mgd.use_4addr)
2833 return RX_DROP_UNUSABLE;
2836 return RX_DROP_UNUSABLE;
2840 if (is_multicast_ether_addr(hdr->addr1))
2841 return RX_DROP_UNUSABLE;
2845 * We should not receive A-MSDUs on pre-HT connections,
2846 * and HT connections cannot use old ciphers. Thus drop
2847 * them, as in those cases we couldn't even have SPP
2850 switch (rx->key->conf.cipher) {
2851 case WLAN_CIPHER_SUITE_WEP40:
2852 case WLAN_CIPHER_SUITE_WEP104:
2853 case WLAN_CIPHER_SUITE_TKIP:
2854 return RX_DROP_UNUSABLE;
2860 return __ieee80211_rx_h_amsdu(rx, 0);
2863 #ifdef CONFIG_MAC80211_MESH
2864 static ieee80211_rx_result
2865 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2867 struct ieee80211_hdr *fwd_hdr, *hdr;
2868 struct ieee80211_tx_info *info;
2869 struct ieee80211s_hdr *mesh_hdr;
2870 struct sk_buff *skb = rx->skb, *fwd_skb;
2871 struct ieee80211_local *local = rx->local;
2872 struct ieee80211_sub_if_data *sdata = rx->sdata;
2873 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2877 hdr = (struct ieee80211_hdr *) skb->data;
2878 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2880 /* make sure fixed part of mesh header is there, also checks skb len */
2881 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2882 return RX_DROP_MONITOR;
2884 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2886 /* make sure full mesh header is there, also checks skb len */
2887 if (!pskb_may_pull(rx->skb,
2888 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2889 return RX_DROP_MONITOR;
2891 /* reload pointers */
2892 hdr = (struct ieee80211_hdr *) skb->data;
2893 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2895 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2896 return RX_DROP_MONITOR;
2898 /* frame is in RMC, don't forward */
2899 if (ieee80211_is_data(hdr->frame_control) &&
2900 is_multicast_ether_addr(hdr->addr1) &&
2901 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2902 return RX_DROP_MONITOR;
2904 if (!ieee80211_is_data(hdr->frame_control))
2908 return RX_DROP_MONITOR;
2910 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2911 struct mesh_path *mppath;
2915 if (is_multicast_ether_addr(hdr->addr1)) {
2916 mpp_addr = hdr->addr3;
2917 proxied_addr = mesh_hdr->eaddr1;
2918 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2919 MESH_FLAGS_AE_A5_A6) {
2920 /* has_a4 already checked in ieee80211_rx_mesh_check */
2921 mpp_addr = hdr->addr4;
2922 proxied_addr = mesh_hdr->eaddr2;
2924 return RX_DROP_MONITOR;
2928 mppath = mpp_path_lookup(sdata, proxied_addr);
2930 mpp_path_add(sdata, proxied_addr, mpp_addr);
2932 spin_lock_bh(&mppath->state_lock);
2933 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2934 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2935 mppath->exp_time = jiffies;
2936 spin_unlock_bh(&mppath->state_lock);
2941 /* Frame has reached destination. Don't forward */
2942 if (!is_multicast_ether_addr(hdr->addr1) &&
2943 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2946 ac = ieee802_1d_to_ac[skb->priority];
2947 q = sdata->vif.hw_queue[ac];
2948 if (ieee80211_queue_stopped(&local->hw, q)) {
2949 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2950 return RX_DROP_MONITOR;
2952 skb_set_queue_mapping(skb, ac);
2954 if (!--mesh_hdr->ttl) {
2955 if (!is_multicast_ether_addr(hdr->addr1))
2956 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2957 dropped_frames_ttl);
2961 if (!ifmsh->mshcfg.dot11MeshForwarding)
2964 if (sdata->crypto_tx_tailroom_needed_cnt)
2965 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2967 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2968 IEEE80211_ENCRYPT_HEADROOM,
2969 tailroom, GFP_ATOMIC);
2973 fwd_skb->dev = sdata->dev;
2974 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2975 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2976 info = IEEE80211_SKB_CB(fwd_skb);
2977 memset(info, 0, sizeof(*info));
2978 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2979 info->control.vif = &rx->sdata->vif;
2980 info->control.jiffies = jiffies;
2981 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2982 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2983 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2984 /* update power mode indication when forwarding */
2985 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2986 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2987 /* mesh power mode flags updated in mesh_nexthop_lookup */
2988 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2990 /* unable to resolve next hop */
2991 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2993 WLAN_REASON_MESH_PATH_NOFORWARD,
2995 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2997 return RX_DROP_MONITOR;
3000 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
3001 ieee80211_add_pending_skb(local, fwd_skb);
3003 if (is_multicast_ether_addr(hdr->addr1))
3005 return RX_DROP_MONITOR;
3009 static ieee80211_rx_result debug_noinline
3010 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
3012 struct ieee80211_sub_if_data *sdata = rx->sdata;
3013 struct ieee80211_local *local = rx->local;
3014 struct net_device *dev = sdata->dev;
3015 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3016 __le16 fc = hdr->frame_control;
3020 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3023 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3024 return RX_DROP_MONITOR;
3027 * Send unexpected-4addr-frame event to hostapd. For older versions,
3028 * also drop the frame to cooked monitor interfaces.
3030 if (ieee80211_has_a4(hdr->frame_control) &&
3031 sdata->vif.type == NL80211_IFTYPE_AP) {
3033 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3034 cfg80211_rx_unexpected_4addr_frame(
3035 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3036 return RX_DROP_MONITOR;
3039 err = __ieee80211_data_to_8023(rx, &port_control);
3041 return RX_DROP_UNUSABLE;
3043 if (!ieee80211_frame_allowed(rx, fc))
3044 return RX_DROP_MONITOR;
3046 /* directly handle TDLS channel switch requests/responses */
3047 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3048 cpu_to_be16(ETH_P_TDLS))) {
3049 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3051 if (pskb_may_pull(rx->skb,
3052 offsetof(struct ieee80211_tdls_data, u)) &&
3053 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3054 tf->category == WLAN_CATEGORY_TDLS &&
3055 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3056 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3057 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3058 __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
3064 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3065 unlikely(port_control) && sdata->bss) {
3066 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3074 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3075 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3076 !is_multicast_ether_addr(
3077 ((struct ethhdr *)rx->skb->data)->h_dest) &&
3078 (!local->scanning &&
3079 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3080 mod_timer(&local->dynamic_ps_timer, jiffies +
3081 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3083 ieee80211_deliver_skb(rx);
3088 static ieee80211_rx_result debug_noinline
3089 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3091 struct sk_buff *skb = rx->skb;
3092 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3093 struct tid_ampdu_rx *tid_agg_rx;
3097 if (likely(!ieee80211_is_ctl(bar->frame_control)))
3100 if (ieee80211_is_back_req(bar->frame_control)) {
3102 __le16 control, start_seq_num;
3103 } __packed bar_data;
3104 struct ieee80211_event event = {
3105 .type = BAR_RX_EVENT,
3109 return RX_DROP_MONITOR;
3111 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3112 &bar_data, sizeof(bar_data)))
3113 return RX_DROP_MONITOR;
3115 tid = le16_to_cpu(bar_data.control) >> 12;
3117 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3118 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3119 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3120 WLAN_BACK_RECIPIENT,
3121 WLAN_REASON_QSTA_REQUIRE_SETUP);
3123 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3125 return RX_DROP_MONITOR;
3127 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3128 event.u.ba.tid = tid;
3129 event.u.ba.ssn = start_seq_num;
3130 event.u.ba.sta = &rx->sta->sta;
3132 /* reset session timer */
3133 if (tid_agg_rx->timeout)
3134 mod_timer(&tid_agg_rx->session_timer,
3135 TU_TO_EXP_TIME(tid_agg_rx->timeout));
3137 spin_lock(&tid_agg_rx->reorder_lock);
3138 /* release stored frames up to start of BAR */
3139 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3140 start_seq_num, frames);
3141 spin_unlock(&tid_agg_rx->reorder_lock);
3143 drv_event_callback(rx->local, rx->sdata, &event);
3150 * After this point, we only want management frames,
3151 * so we can drop all remaining control frames to
3152 * cooked monitor interfaces.
3154 return RX_DROP_MONITOR;
3157 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3158 struct ieee80211_mgmt *mgmt,
3161 struct ieee80211_local *local = sdata->local;
3162 struct sk_buff *skb;
3163 struct ieee80211_mgmt *resp;
3165 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3166 /* Not to own unicast address */
3170 if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
3171 !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
3172 /* Not from the current AP or not associated yet. */
3176 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3177 /* Too short SA Query request frame */
3181 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3185 skb_reserve(skb, local->hw.extra_tx_headroom);
3186 resp = skb_put_zero(skb, 24);
3187 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3188 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3189 memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3190 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3191 IEEE80211_STYPE_ACTION);
3192 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3193 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3194 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3195 memcpy(resp->u.action.u.sa_query.trans_id,
3196 mgmt->u.action.u.sa_query.trans_id,
3197 WLAN_SA_QUERY_TR_ID_LEN);
3199 ieee80211_tx_skb(sdata, skb);
3203 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3205 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3206 const struct element *ie;
3209 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
3210 NL80211_EXT_FEATURE_BSS_COLOR))
3213 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3216 if (rx->sdata->vif.bss_conf.csa_active)
3219 baselen = mgmt->u.beacon.variable - rx->skb->data;
3220 if (baselen > rx->skb->len)
3223 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
3224 mgmt->u.beacon.variable,
3225 rx->skb->len - baselen);
3226 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3227 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
3228 struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
3229 const struct ieee80211_he_operation *he_oper;
3232 he_oper = (void *)(ie->data + 1);
3233 if (le32_get_bits(he_oper->he_oper_params,
3234 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3237 color = le32_get_bits(he_oper->he_oper_params,
3238 IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3239 if (color == bss_conf->he_bss_color.color)
3240 ieeee80211_obss_color_collision_notify(&rx->sdata->vif,
3246 static ieee80211_rx_result debug_noinline
3247 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3249 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3250 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3252 if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3256 * From here on, look only at management frames.
3257 * Data and control frames are already handled,
3258 * and unknown (reserved) frames are useless.
3260 if (rx->skb->len < 24)
3261 return RX_DROP_MONITOR;
3263 if (!ieee80211_is_mgmt(mgmt->frame_control))
3264 return RX_DROP_MONITOR;
3266 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3267 ieee80211_is_beacon(mgmt->frame_control) &&
3268 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3271 /* sw bss color collision detection */
3272 ieee80211_rx_check_bss_color_collision(rx);
3274 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3275 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3276 sig = status->signal;
3278 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3279 rx->skb->data, rx->skb->len,
3280 ieee80211_rx_status_to_khz(status),
3282 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3285 if (ieee80211_drop_unencrypted_mgmt(rx))
3286 return RX_DROP_UNUSABLE;
3292 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3294 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3295 struct ieee80211_sub_if_data *sdata = rx->sdata;
3297 /* TWT actions are only supported in AP for the moment */
3298 if (sdata->vif.type != NL80211_IFTYPE_AP)
3301 if (!rx->local->ops->add_twt_setup)
3304 if (!sdata->vif.bss_conf.twt_responder)
3310 switch (mgmt->u.action.u.s1g.action_code) {
3311 case WLAN_S1G_TWT_SETUP: {
3312 struct ieee80211_twt_setup *twt;
3314 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3315 1 + /* action code */
3316 sizeof(struct ieee80211_twt_setup) +
3317 2 /* TWT req_type agrt */)
3320 twt = (void *)mgmt->u.action.u.s1g.variable;
3321 if (twt->element_id != WLAN_EID_S1G_TWT)
3324 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3325 4 + /* action code + token + tlv */
3329 return true; /* queue the frame */
3331 case WLAN_S1G_TWT_TEARDOWN:
3332 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3335 return true; /* queue the frame */
3343 static ieee80211_rx_result debug_noinline
3344 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3346 struct ieee80211_local *local = rx->local;
3347 struct ieee80211_sub_if_data *sdata = rx->sdata;
3348 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3349 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3350 int len = rx->skb->len;
3352 if (!ieee80211_is_action(mgmt->frame_control))
3355 /* drop too small frames */
3356 if (len < IEEE80211_MIN_ACTION_SIZE)
3357 return RX_DROP_UNUSABLE;
3359 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3360 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3361 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3362 return RX_DROP_UNUSABLE;
3364 switch (mgmt->u.action.category) {
3365 case WLAN_CATEGORY_HT:
3366 /* reject HT action frames from stations not supporting HT */
3367 if (!rx->link_sta->pub->ht_cap.ht_supported)
3370 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3371 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3372 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3373 sdata->vif.type != NL80211_IFTYPE_AP &&
3374 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3377 /* verify action & smps_control/chanwidth are present */
3378 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3381 switch (mgmt->u.action.u.ht_smps.action) {
3382 case WLAN_HT_ACTION_SMPS: {
3383 struct ieee80211_supported_band *sband;
3384 enum ieee80211_smps_mode smps_mode;
3385 struct sta_opmode_info sta_opmode = {};
3387 if (sdata->vif.type != NL80211_IFTYPE_AP &&
3388 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3391 /* convert to HT capability */
3392 switch (mgmt->u.action.u.ht_smps.smps_control) {
3393 case WLAN_HT_SMPS_CONTROL_DISABLED:
3394 smps_mode = IEEE80211_SMPS_OFF;
3396 case WLAN_HT_SMPS_CONTROL_STATIC:
3397 smps_mode = IEEE80211_SMPS_STATIC;
3399 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3400 smps_mode = IEEE80211_SMPS_DYNAMIC;
3406 /* if no change do nothing */
3407 if (rx->link_sta->pub->smps_mode == smps_mode)
3409 rx->link_sta->pub->smps_mode = smps_mode;
3410 sta_opmode.smps_mode =
3411 ieee80211_smps_mode_to_smps_mode(smps_mode);
3412 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3414 sband = rx->local->hw.wiphy->bands[status->band];
3416 rate_control_rate_update(local, sband, rx->sta, 0,
3417 IEEE80211_RC_SMPS_CHANGED);
3418 cfg80211_sta_opmode_change_notify(sdata->dev,
3424 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3425 struct ieee80211_supported_band *sband;
3426 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3427 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3428 struct sta_opmode_info sta_opmode = {};
3430 /* If it doesn't support 40 MHz it can't change ... */
3431 if (!(rx->link_sta->pub->ht_cap.cap &
3432 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3435 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3436 max_bw = IEEE80211_STA_RX_BW_20;
3438 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
3440 /* set cur_max_bandwidth and recalc sta bw */
3441 rx->link_sta->cur_max_bandwidth = max_bw;
3442 new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
3444 if (rx->link_sta->pub->bandwidth == new_bw)
3447 rx->link_sta->pub->bandwidth = new_bw;
3448 sband = rx->local->hw.wiphy->bands[status->band];
3450 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
3451 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3453 rate_control_rate_update(local, sband, rx->sta, 0,
3454 IEEE80211_RC_BW_CHANGED);
3455 cfg80211_sta_opmode_change_notify(sdata->dev,
3466 case WLAN_CATEGORY_PUBLIC:
3467 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3469 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3473 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
3475 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3476 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3478 if (len < offsetof(struct ieee80211_mgmt,
3479 u.action.u.ext_chan_switch.variable))
3482 case WLAN_CATEGORY_VHT:
3483 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3484 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3485 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3486 sdata->vif.type != NL80211_IFTYPE_AP &&
3487 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3490 /* verify action code is present */
3491 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3494 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3495 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3496 /* verify opmode is present */
3497 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3501 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3502 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3510 case WLAN_CATEGORY_BACK:
3511 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3512 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3513 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3514 sdata->vif.type != NL80211_IFTYPE_AP &&
3515 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3518 /* verify action_code is present */
3519 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3522 switch (mgmt->u.action.u.addba_req.action_code) {
3523 case WLAN_ACTION_ADDBA_REQ:
3524 if (len < (IEEE80211_MIN_ACTION_SIZE +
3525 sizeof(mgmt->u.action.u.addba_req)))
3528 case WLAN_ACTION_ADDBA_RESP:
3529 if (len < (IEEE80211_MIN_ACTION_SIZE +
3530 sizeof(mgmt->u.action.u.addba_resp)))
3533 case WLAN_ACTION_DELBA:
3534 if (len < (IEEE80211_MIN_ACTION_SIZE +
3535 sizeof(mgmt->u.action.u.delba)))
3543 case WLAN_CATEGORY_SPECTRUM_MGMT:
3544 /* verify action_code is present */
3545 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3548 switch (mgmt->u.action.u.measurement.action_code) {
3549 case WLAN_ACTION_SPCT_MSR_REQ:
3550 if (status->band != NL80211_BAND_5GHZ)
3553 if (len < (IEEE80211_MIN_ACTION_SIZE +
3554 sizeof(mgmt->u.action.u.measurement)))
3557 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3560 ieee80211_process_measurement_req(sdata, mgmt, len);
3562 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3564 if (len < (IEEE80211_MIN_ACTION_SIZE +
3565 sizeof(mgmt->u.action.u.chan_switch)))
3568 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3569 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3570 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3573 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3574 bssid = sdata->deflink.u.mgd.bssid;
3575 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3576 bssid = sdata->u.ibss.bssid;
3577 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3582 if (!ether_addr_equal(mgmt->bssid, bssid))
3589 case WLAN_CATEGORY_SELF_PROTECTED:
3590 if (len < (IEEE80211_MIN_ACTION_SIZE +
3591 sizeof(mgmt->u.action.u.self_prot.action_code)))
3594 switch (mgmt->u.action.u.self_prot.action_code) {
3595 case WLAN_SP_MESH_PEERING_OPEN:
3596 case WLAN_SP_MESH_PEERING_CLOSE:
3597 case WLAN_SP_MESH_PEERING_CONFIRM:
3598 if (!ieee80211_vif_is_mesh(&sdata->vif))
3600 if (sdata->u.mesh.user_mpm)
3601 /* userspace handles this frame */
3604 case WLAN_SP_MGK_INFORM:
3605 case WLAN_SP_MGK_ACK:
3606 if (!ieee80211_vif_is_mesh(&sdata->vif))
3611 case WLAN_CATEGORY_MESH_ACTION:
3612 if (len < (IEEE80211_MIN_ACTION_SIZE +
3613 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3616 if (!ieee80211_vif_is_mesh(&sdata->vif))
3618 if (mesh_action_is_path_sel(mgmt) &&
3619 !mesh_path_sel_is_hwmp(sdata))
3622 case WLAN_CATEGORY_S1G:
3623 switch (mgmt->u.action.u.s1g.action_code) {
3624 case WLAN_S1G_TWT_SETUP:
3625 case WLAN_S1G_TWT_TEARDOWN:
3626 if (ieee80211_process_rx_twt_action(rx))
3638 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3639 /* will return in the next handlers */
3644 rx->link_sta->rx_stats.packets++;
3645 dev_kfree_skb(rx->skb);
3649 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3653 static ieee80211_rx_result debug_noinline
3654 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3656 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3657 struct cfg80211_rx_info info = {
3658 .freq = ieee80211_rx_status_to_khz(status),
3659 .buf = rx->skb->data,
3660 .len = rx->skb->len,
3661 .link_id = rx->link_id,
3662 .have_link_id = rx->link_id >= 0,
3665 /* skip known-bad action frames and return them in the next handler */
3666 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3670 * Getting here means the kernel doesn't know how to handle
3671 * it, but maybe userspace does ... include returned frames
3672 * so userspace can register for those to know whether ones
3673 * it transmitted were processed or returned.
3676 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3677 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3678 info.sig_dbm = status->signal;
3680 if (ieee80211_is_timing_measurement(rx->skb) ||
3681 ieee80211_is_ftm(rx->skb)) {
3682 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
3683 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
3686 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
3688 rx->link_sta->rx_stats.packets++;
3689 dev_kfree_skb(rx->skb);
3696 static ieee80211_rx_result debug_noinline
3697 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3699 struct ieee80211_sub_if_data *sdata = rx->sdata;
3700 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3701 int len = rx->skb->len;
3703 if (!ieee80211_is_action(mgmt->frame_control))
3706 switch (mgmt->u.action.category) {
3707 case WLAN_CATEGORY_SA_QUERY:
3708 if (len < (IEEE80211_MIN_ACTION_SIZE +
3709 sizeof(mgmt->u.action.u.sa_query)))
3712 switch (mgmt->u.action.u.sa_query.action) {
3713 case WLAN_ACTION_SA_QUERY_REQUEST:
3714 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3716 ieee80211_process_sa_query_req(sdata, mgmt, len);
3726 rx->link_sta->rx_stats.packets++;
3727 dev_kfree_skb(rx->skb);
3731 static ieee80211_rx_result debug_noinline
3732 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3734 struct ieee80211_local *local = rx->local;
3735 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3736 struct sk_buff *nskb;
3737 struct ieee80211_sub_if_data *sdata = rx->sdata;
3738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3740 if (!ieee80211_is_action(mgmt->frame_control))
3744 * For AP mode, hostapd is responsible for handling any action
3745 * frames that we didn't handle, including returning unknown
3746 * ones. For all other modes we will return them to the sender,
3747 * setting the 0x80 bit in the action category, as required by
3748 * 802.11-2012 9.24.4.
3749 * Newer versions of hostapd shall also use the management frame
3750 * registration mechanisms, but older ones still use cooked
3751 * monitor interfaces so push all frames there.
3753 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3754 (sdata->vif.type == NL80211_IFTYPE_AP ||
3755 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3756 return RX_DROP_MONITOR;
3758 if (is_multicast_ether_addr(mgmt->da))
3759 return RX_DROP_MONITOR;
3761 /* do not return rejected action frames */
3762 if (mgmt->u.action.category & 0x80)
3763 return RX_DROP_UNUSABLE;
3765 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3768 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3770 nmgmt->u.action.category |= 0x80;
3771 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3772 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3774 memset(nskb->cb, 0, sizeof(nskb->cb));
3776 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3777 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3779 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3780 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3781 IEEE80211_TX_CTL_NO_CCK_RATE;
3782 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3784 local->hw.offchannel_tx_hw_queue;
3787 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
3790 dev_kfree_skb(rx->skb);
3794 static ieee80211_rx_result debug_noinline
3795 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3797 struct ieee80211_sub_if_data *sdata = rx->sdata;
3798 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3800 if (!ieee80211_is_ext(hdr->frame_control))
3803 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3804 return RX_DROP_MONITOR;
3806 /* for now only beacons are ext, so queue them */
3807 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3812 static ieee80211_rx_result debug_noinline
3813 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3815 struct ieee80211_sub_if_data *sdata = rx->sdata;
3816 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3819 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3821 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3822 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3823 sdata->vif.type != NL80211_IFTYPE_OCB &&
3824 sdata->vif.type != NL80211_IFTYPE_STATION)
3825 return RX_DROP_MONITOR;
3828 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3829 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3830 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3831 /* process for all: mesh, mlme, ibss */
3833 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3834 if (is_multicast_ether_addr(mgmt->da) &&
3835 !is_broadcast_ether_addr(mgmt->da))
3836 return RX_DROP_MONITOR;
3838 /* process only for station/IBSS */
3839 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3840 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3841 return RX_DROP_MONITOR;
3843 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3844 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3845 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3846 if (is_multicast_ether_addr(mgmt->da) &&
3847 !is_broadcast_ether_addr(mgmt->da))
3848 return RX_DROP_MONITOR;
3850 /* process only for station */
3851 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3852 return RX_DROP_MONITOR;
3854 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3855 /* process only for ibss and mesh */
3856 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3857 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3858 return RX_DROP_MONITOR;
3861 return RX_DROP_MONITOR;
3864 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3869 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3870 struct ieee80211_rate *rate)
3872 struct ieee80211_sub_if_data *sdata;
3873 struct ieee80211_local *local = rx->local;
3874 struct sk_buff *skb = rx->skb, *skb2;
3875 struct net_device *prev_dev = NULL;
3876 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3877 int needed_headroom;
3880 * If cooked monitor has been processed already, then
3881 * don't do it again. If not, set the flag.
3883 if (rx->flags & IEEE80211_RX_CMNTR)
3885 rx->flags |= IEEE80211_RX_CMNTR;
3887 /* If there are no cooked monitor interfaces, just free the SKB */
3888 if (!local->cooked_mntrs)
3891 /* vendor data is long removed here */
3892 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3893 /* room for the radiotap header based on driver features */
3894 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3896 if (skb_headroom(skb) < needed_headroom &&
3897 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3900 /* prepend radiotap information */
3901 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3904 skb_reset_mac_header(skb);
3905 skb->ip_summed = CHECKSUM_UNNECESSARY;
3906 skb->pkt_type = PACKET_OTHERHOST;
3907 skb->protocol = htons(ETH_P_802_2);
3909 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3910 if (!ieee80211_sdata_running(sdata))
3913 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3914 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3918 skb2 = skb_clone(skb, GFP_ATOMIC);
3920 skb2->dev = prev_dev;
3921 netif_receive_skb(skb2);
3925 prev_dev = sdata->dev;
3926 dev_sw_netstats_rx_add(sdata->dev, skb->len);
3930 skb->dev = prev_dev;
3931 netif_receive_skb(skb);
3939 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3940 ieee80211_rx_result res)
3943 case RX_DROP_MONITOR:
3944 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3946 rx->link_sta->rx_stats.dropped++;
3949 struct ieee80211_rate *rate = NULL;
3950 struct ieee80211_supported_band *sband;
3951 struct ieee80211_rx_status *status;
3953 status = IEEE80211_SKB_RXCB((rx->skb));
3955 sband = rx->local->hw.wiphy->bands[status->band];
3956 if (status->encoding == RX_ENC_LEGACY)
3957 rate = &sband->bitrates[status->rate_idx];
3959 ieee80211_rx_cooked_monitor(rx, rate);
3962 case RX_DROP_UNUSABLE:
3963 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3965 rx->link_sta->rx_stats.dropped++;
3966 dev_kfree_skb(rx->skb);
3969 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3974 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3975 struct sk_buff_head *frames)
3977 ieee80211_rx_result res = RX_DROP_MONITOR;
3978 struct sk_buff *skb;
3980 #define CALL_RXH(rxh) \
3983 if (res != RX_CONTINUE) \
3987 /* Lock here to avoid hitting all of the data used in the RX
3988 * path (e.g. key data, station data, ...) concurrently when
3989 * a frame is released from the reorder buffer due to timeout
3990 * from the timer, potentially concurrently with RX from the
3993 spin_lock_bh(&rx->local->rx_path_lock);
3995 while ((skb = __skb_dequeue(frames))) {
3997 * all the other fields are valid across frames
3998 * that belong to an aMPDU since they are on the
3999 * same TID from the same station
4003 if (WARN_ON_ONCE(!rx->link))
4006 CALL_RXH(ieee80211_rx_h_check_more_data);
4007 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
4008 CALL_RXH(ieee80211_rx_h_sta_process);
4009 CALL_RXH(ieee80211_rx_h_decrypt);
4010 CALL_RXH(ieee80211_rx_h_defragment);
4011 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
4012 /* must be after MMIC verify so header is counted in MPDU mic */
4013 #ifdef CONFIG_MAC80211_MESH
4014 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
4015 CALL_RXH(ieee80211_rx_h_mesh_fwding);
4017 CALL_RXH(ieee80211_rx_h_amsdu);
4018 CALL_RXH(ieee80211_rx_h_data);
4020 /* special treatment -- needs the queue */
4021 res = ieee80211_rx_h_ctrl(rx, frames);
4022 if (res != RX_CONTINUE)
4025 CALL_RXH(ieee80211_rx_h_mgmt_check);
4026 CALL_RXH(ieee80211_rx_h_action);
4027 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4028 CALL_RXH(ieee80211_rx_h_action_post_userspace);
4029 CALL_RXH(ieee80211_rx_h_action_return);
4030 CALL_RXH(ieee80211_rx_h_ext);
4031 CALL_RXH(ieee80211_rx_h_mgmt);
4034 ieee80211_rx_handlers_result(rx, res);
4039 spin_unlock_bh(&rx->local->rx_path_lock);
4042 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4044 struct sk_buff_head reorder_release;
4045 ieee80211_rx_result res = RX_DROP_MONITOR;
4047 __skb_queue_head_init(&reorder_release);
4049 #define CALL_RXH(rxh) \
4052 if (res != RX_CONTINUE) \
4056 CALL_RXH(ieee80211_rx_h_check_dup);
4057 CALL_RXH(ieee80211_rx_h_check);
4059 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
4061 ieee80211_rx_handlers(rx, &reorder_release);
4065 ieee80211_rx_handlers_result(rx, res);
4071 * This function makes calls into the RX path, therefore
4072 * it has to be invoked under RCU read lock.
4074 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4076 struct sk_buff_head frames;
4077 struct ieee80211_rx_data rx = {
4079 .sdata = sta->sdata,
4080 .local = sta->local,
4081 /* This is OK -- must be QoS data frame */
4082 .security_idx = tid,
4086 struct tid_ampdu_rx *tid_agg_rx;
4089 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4093 __skb_queue_head_init(&frames);
4095 spin_lock(&tid_agg_rx->reorder_lock);
4096 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4097 spin_unlock(&tid_agg_rx->reorder_lock);
4099 if (!skb_queue_empty(&frames)) {
4100 struct ieee80211_event event = {
4101 .type = BA_FRAME_TIMEOUT,
4103 .u.ba.sta = &sta->sta,
4105 drv_event_callback(rx.local, rx.sdata, &event);
4107 /* FIXME: statistics won't be right with this */
4108 link_id = sta->sta.valid_links ? ffs(sta->sta.valid_links) - 1 : 0;
4109 rx.link = rcu_dereference(sta->sdata->link[link_id]);
4110 rx.link_sta = rcu_dereference(sta->link[link_id]);
4112 ieee80211_rx_handlers(&rx, &frames);
4115 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4116 u16 ssn, u64 filtered,
4119 struct sta_info *sta;
4120 struct tid_ampdu_rx *tid_agg_rx;
4121 struct sk_buff_head frames;
4122 struct ieee80211_rx_data rx = {
4123 /* This is OK -- must be QoS data frame */
4124 .security_idx = tid,
4130 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4133 __skb_queue_head_init(&frames);
4135 sta = container_of(pubsta, struct sta_info, sta);
4138 rx.sdata = sta->sdata;
4139 rx.link = &rx.sdata->deflink;
4140 rx.local = sta->local;
4143 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4147 spin_lock_bh(&tid_agg_rx->reorder_lock);
4149 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4152 /* release all frames in the reorder buffer */
4153 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4154 IEEE80211_SN_MODULO;
4155 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4157 /* update ssn to match received ssn */
4158 tid_agg_rx->head_seq_num = ssn;
4160 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4164 /* handle the case that received ssn is behind the mac ssn.
4165 * it can be tid_agg_rx->buf_size behind and still be valid */
4166 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4167 if (diff >= tid_agg_rx->buf_size) {
4168 tid_agg_rx->reorder_buf_filtered = 0;
4171 filtered = filtered >> diff;
4175 for (i = 0; i < tid_agg_rx->buf_size; i++) {
4176 int index = (ssn + i) % tid_agg_rx->buf_size;
4178 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4179 if (filtered & BIT_ULL(i))
4180 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4183 /* now process also frames that the filter marking released */
4184 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4187 spin_unlock_bh(&tid_agg_rx->reorder_lock);
4189 ieee80211_rx_handlers(&rx, &frames);
4194 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4196 /* main receive path */
4198 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4200 return ether_addr_equal(raddr, addr) ||
4201 is_broadcast_ether_addr(raddr);
4204 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4206 struct ieee80211_sub_if_data *sdata = rx->sdata;
4207 struct sk_buff *skb = rx->skb;
4208 struct ieee80211_hdr *hdr = (void *)skb->data;
4209 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4210 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4211 bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4212 ieee80211_is_s1g_beacon(hdr->frame_control);
4214 switch (sdata->vif.type) {
4215 case NL80211_IFTYPE_STATION:
4216 if (!bssid && !sdata->u.mgd.use_4addr)
4218 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4222 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
4223 case NL80211_IFTYPE_ADHOC:
4226 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4227 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4228 !is_valid_ether_addr(hdr->addr2))
4230 if (ieee80211_is_beacon(hdr->frame_control))
4232 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4235 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4239 if (status->encoding != RX_ENC_LEGACY)
4240 rate_idx = 0; /* TODO: HT/VHT rates */
4242 rate_idx = status->rate_idx;
4243 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4247 case NL80211_IFTYPE_OCB:
4250 if (!ieee80211_is_data_present(hdr->frame_control))
4252 if (!is_broadcast_ether_addr(bssid))
4255 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4259 if (status->encoding != RX_ENC_LEGACY)
4260 rate_idx = 0; /* TODO: HT rates */
4262 rate_idx = status->rate_idx;
4263 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4267 case NL80211_IFTYPE_MESH_POINT:
4268 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4272 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4273 case NL80211_IFTYPE_AP_VLAN:
4274 case NL80211_IFTYPE_AP:
4276 return ieee80211_is_our_addr(sdata, hdr->addr1,
4279 if (!is_broadcast_ether_addr(bssid) &&
4280 !ieee80211_is_our_addr(sdata, bssid, NULL)) {
4282 * Accept public action frames even when the
4283 * BSSID doesn't match, this is used for P2P
4284 * and location updates. Note that mac80211
4285 * itself never looks at these frames.
4288 !ieee80211_is_our_addr(sdata, hdr->addr1,
4291 if (ieee80211_is_public_action(hdr, skb->len))
4293 return ieee80211_is_beacon(hdr->frame_control);
4296 if (!ieee80211_has_tods(hdr->frame_control)) {
4297 /* ignore data frames to TDLS-peers */
4298 if (ieee80211_is_data(hdr->frame_control))
4300 /* ignore action frames to TDLS-peers */
4301 if (ieee80211_is_action(hdr->frame_control) &&
4302 !is_broadcast_ether_addr(bssid) &&
4303 !ether_addr_equal(bssid, hdr->addr1))
4308 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4309 * the BSSID - we've checked that already but may have accepted
4310 * the wildcard (ff:ff:ff:ff:ff:ff).
4313 * The BSSID of the Data frame is determined as follows:
4314 * a) If the STA is contained within an AP or is associated
4315 * with an AP, the BSSID is the address currently in use
4316 * by the STA contained in the AP.
4318 * So we should not accept data frames with an address that's
4321 * Accepting it also opens a security problem because stations
4322 * could encrypt it with the GTK and inject traffic that way.
4324 if (ieee80211_is_data(hdr->frame_control) && multicast)
4328 case NL80211_IFTYPE_P2P_DEVICE:
4329 return ieee80211_is_public_action(hdr, skb->len) ||
4330 ieee80211_is_probe_req(hdr->frame_control) ||
4331 ieee80211_is_probe_resp(hdr->frame_control) ||
4332 ieee80211_is_beacon(hdr->frame_control);
4333 case NL80211_IFTYPE_NAN:
4334 /* Currently no frames on NAN interface are allowed */
4344 void ieee80211_check_fast_rx(struct sta_info *sta)
4346 struct ieee80211_sub_if_data *sdata = sta->sdata;
4347 struct ieee80211_local *local = sdata->local;
4348 struct ieee80211_key *key;
4349 struct ieee80211_fast_rx fastrx = {
4351 .vif_type = sdata->vif.type,
4352 .control_port_protocol = sdata->control_port_protocol,
4353 }, *old, *new = NULL;
4355 bool set_offload = false;
4356 bool assign = false;
4359 /* use sparse to check that we don't return without updating */
4360 __acquire(check_fast_rx);
4362 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4363 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4364 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4365 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4367 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4369 /* fast-rx doesn't do reordering */
4370 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4371 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4374 switch (sdata->vif.type) {
4375 case NL80211_IFTYPE_STATION:
4376 if (sta->sta.tdls) {
4377 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4378 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4379 fastrx.expected_ds_bits = 0;
4381 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4382 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4383 fastrx.expected_ds_bits =
4384 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4387 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4388 fastrx.expected_ds_bits |=
4389 cpu_to_le16(IEEE80211_FCTL_TODS);
4390 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4391 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4394 if (!sdata->u.mgd.powersave)
4397 /* software powersave is a huge mess, avoid all of it */
4398 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4400 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4401 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4404 case NL80211_IFTYPE_AP_VLAN:
4405 case NL80211_IFTYPE_AP:
4406 /* parallel-rx requires this, at least with calls to
4407 * ieee80211_sta_ps_transition()
4409 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4411 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4412 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4413 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4415 fastrx.internal_forward =
4416 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4417 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4418 !sdata->u.vlan.sta);
4420 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4421 sdata->u.vlan.sta) {
4422 fastrx.expected_ds_bits |=
4423 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4424 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4425 fastrx.internal_forward = 0;
4433 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4437 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4439 key = rcu_dereference(sdata->default_unicast_key);
4441 switch (key->conf.cipher) {
4442 case WLAN_CIPHER_SUITE_TKIP:
4443 /* we don't want to deal with MMIC in fast-rx */
4445 case WLAN_CIPHER_SUITE_CCMP:
4446 case WLAN_CIPHER_SUITE_CCMP_256:
4447 case WLAN_CIPHER_SUITE_GCMP:
4448 case WLAN_CIPHER_SUITE_GCMP_256:
4451 /* We also don't want to deal with
4452 * WEP or cipher scheme.
4458 fastrx.icv_len = key->conf.icv_len;
4465 __release(check_fast_rx);
4468 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4470 offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4471 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4473 if (assign && offload)
4474 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4476 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4479 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4481 spin_lock_bh(&sta->lock);
4482 old = rcu_dereference_protected(sta->fast_rx, true);
4483 rcu_assign_pointer(sta->fast_rx, new);
4484 spin_unlock_bh(&sta->lock);
4487 kfree_rcu(old, rcu_head);
4490 void ieee80211_clear_fast_rx(struct sta_info *sta)
4492 struct ieee80211_fast_rx *old;
4494 spin_lock_bh(&sta->lock);
4495 old = rcu_dereference_protected(sta->fast_rx, true);
4496 RCU_INIT_POINTER(sta->fast_rx, NULL);
4497 spin_unlock_bh(&sta->lock);
4500 kfree_rcu(old, rcu_head);
4503 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4505 struct ieee80211_local *local = sdata->local;
4506 struct sta_info *sta;
4508 lockdep_assert_held(&local->sta_mtx);
4510 list_for_each_entry(sta, &local->sta_list, list) {
4511 if (sdata != sta->sdata &&
4512 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4514 ieee80211_check_fast_rx(sta);
4518 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4520 struct ieee80211_local *local = sdata->local;
4522 mutex_lock(&local->sta_mtx);
4523 __ieee80211_check_fast_rx_iface(sdata);
4524 mutex_unlock(&local->sta_mtx);
4528 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4533 return !!(sta->valid_links & BIT(link_id));
4536 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4537 struct ieee80211_fast_rx *fast_rx,
4540 struct ieee80211_sta_rx_stats *stats;
4541 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4542 struct sta_info *sta = rx->sta;
4543 struct link_sta_info *link_sta;
4544 struct sk_buff *skb = rx->skb;
4545 void *sa = skb->data + ETH_ALEN;
4546 void *da = skb->data;
4548 if (rx->link_id >= 0) {
4549 link_sta = rcu_dereference(sta->link[rx->link_id]);
4550 if (WARN_ON_ONCE(!link_sta)) {
4551 dev_kfree_skb(rx->skb);
4555 link_sta = &sta->deflink;
4558 stats = &link_sta->rx_stats;
4559 if (fast_rx->uses_rss)
4560 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4562 /* statistics part of ieee80211_rx_h_sta_process() */
4563 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4564 stats->last_signal = status->signal;
4565 if (!fast_rx->uses_rss)
4566 ewma_signal_add(&link_sta->rx_stats_avg.signal,
4570 if (status->chains) {
4573 stats->chains = status->chains;
4574 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4575 int signal = status->chain_signal[i];
4577 if (!(status->chains & BIT(i)))
4580 stats->chain_signal_last[i] = signal;
4581 if (!fast_rx->uses_rss)
4582 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
4586 /* end of statistics */
4588 stats->last_rx = jiffies;
4589 stats->last_rate = sta_stats_encode_rate(status);
4594 skb->dev = fast_rx->dev;
4596 dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4598 /* The seqno index has the same property as needed
4599 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4600 * for non-QoS-data frames. Here we know it's a data
4601 * frame, so count MSDUs.
4603 u64_stats_update_begin(&stats->syncp);
4604 stats->msdu[rx->seqno_idx]++;
4605 stats->bytes += orig_len;
4606 u64_stats_update_end(&stats->syncp);
4608 if (fast_rx->internal_forward) {
4609 struct sk_buff *xmit_skb = NULL;
4610 if (is_multicast_ether_addr(da)) {
4611 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4612 } else if (!ether_addr_equal(da, sa) &&
4613 sta_info_get(rx->sdata, da)) {
4620 * Send to wireless media and increase priority by 256
4621 * to keep the received priority instead of
4622 * reclassifying the frame (see cfg80211_classify8021d).
4624 xmit_skb->priority += 256;
4625 xmit_skb->protocol = htons(ETH_P_802_3);
4626 skb_reset_network_header(xmit_skb);
4627 skb_reset_mac_header(xmit_skb);
4628 dev_queue_xmit(xmit_skb);
4635 /* deliver to local stack */
4636 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4637 ieee80211_deliver_skb_to_local_stack(skb, rx);
4640 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4641 struct ieee80211_fast_rx *fast_rx)
4643 struct sk_buff *skb = rx->skb;
4644 struct ieee80211_hdr *hdr = (void *)skb->data;
4645 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4646 struct sta_info *sta = rx->sta;
4647 int orig_len = skb->len;
4648 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4649 int snap_offs = hdrlen;
4651 u8 snap[sizeof(rfc1042_header)];
4653 } *payload __aligned(2);
4657 } addrs __aligned(2);
4658 struct link_sta_info *link_sta;
4659 struct ieee80211_sta_rx_stats *stats;
4661 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4662 * to a common data structure; drivers can implement that per queue
4663 * but we don't have that information in mac80211
4665 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4668 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4670 /* If using encryption, we also need to have:
4671 * - PN_VALIDATED: similar, but the implementation is tricky
4672 * - DECRYPTED: necessary for PN_VALIDATED
4675 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4678 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4681 if (unlikely(ieee80211_is_frag(hdr)))
4684 /* Since our interface address cannot be multicast, this
4685 * implicitly also rejects multicast frames without the
4688 * We shouldn't get any *data* frames not addressed to us
4689 * (AP mode will accept multicast *management* frames), but
4690 * punting here will make it go through the full checks in
4691 * ieee80211_accept_frame().
4693 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4696 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4697 IEEE80211_FCTL_TODS)) !=
4698 fast_rx->expected_ds_bits)
4701 /* assign the key to drop unencrypted frames (later)
4702 * and strip the IV/MIC if necessary
4704 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4705 /* GCMP header length is the same */
4706 snap_offs += IEEE80211_CCMP_HDR_LEN;
4709 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4710 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4713 payload = (void *)(skb->data + snap_offs);
4715 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4718 /* Don't handle these here since they require special code.
4719 * Accept AARP and IPX even though they should come with a
4720 * bridge-tunnel header - but if we get them this way then
4721 * there's little point in discarding them.
4723 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4724 payload->proto == fast_rx->control_port_protocol))
4728 /* after this point, don't punt to the slowpath! */
4730 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4731 pskb_trim(skb, skb->len - fast_rx->icv_len))
4734 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4737 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4738 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4745 /* do the header conversion - first grab the addresses */
4746 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4747 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4748 skb_postpull_rcsum(skb, skb->data + snap_offs,
4749 sizeof(rfc1042_header) + 2);
4750 /* remove the SNAP but leave the ethertype */
4751 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4752 /* push the addresses in front */
4753 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4755 ieee80211_rx_8023(rx, fast_rx, orig_len);
4761 if (rx->link_id >= 0) {
4762 link_sta = rcu_dereference(sta->link[rx->link_id]);
4766 link_sta = &sta->deflink;
4769 if (fast_rx->uses_rss)
4770 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4772 stats = &link_sta->rx_stats;
4779 * This function returns whether or not the SKB
4780 * was destined for RX processing or not, which,
4781 * if consume is true, is equivalent to whether
4782 * or not the skb was consumed.
4784 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4785 struct sk_buff *skb, bool consume)
4787 struct ieee80211_local *local = rx->local;
4788 struct ieee80211_sub_if_data *sdata = rx->sdata;
4789 struct ieee80211_hdr *hdr = (void *)skb->data;
4790 struct link_sta_info *link_sta = NULL;
4791 struct ieee80211_link_data *link;
4795 /* See if we can do fast-rx; if we have to copy we already lost,
4796 * so punt in that case. We should never have to deliver a data
4797 * frame to multiple interfaces anyway.
4799 * We skip the ieee80211_accept_frame() call and do the necessary
4800 * checking inside ieee80211_invoke_fast_rx().
4802 if (consume && rx->sta) {
4803 struct ieee80211_fast_rx *fast_rx;
4805 fast_rx = rcu_dereference(rx->sta->fast_rx);
4806 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4810 if (!ieee80211_accept_frame(rx))
4813 if (rx->link_id >= 0) {
4814 link = rcu_dereference(rx->sdata->link[rx->link_id]);
4816 /* we might race link removal */
4823 rcu_dereference(rx->sta->link[rx->link_id]);
4829 rx->link_sta = &rx->sta->deflink;
4831 rx->link = &sdata->deflink;
4834 if (unlikely(!is_multicast_ether_addr(hdr->addr1) &&
4835 rx->link_id >= 0 && rx->sta && rx->sta->sta.mlo)) {
4836 link_sta = rcu_dereference(rx->sta->link[rx->link_id]);
4838 if (WARN_ON_ONCE(!link_sta))
4843 struct skb_shared_hwtstamps *shwt;
4845 rx->skb = skb_copy(skb, GFP_ATOMIC);
4847 if (net_ratelimit())
4848 wiphy_debug(local->hw.wiphy,
4849 "failed to copy skb for %s\n",
4854 /* skb_copy() does not copy the hw timestamps, so copy it
4857 shwt = skb_hwtstamps(rx->skb);
4858 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
4861 if (unlikely(link_sta)) {
4862 /* translate to MLD addresses */
4863 if (ether_addr_equal(link->conf->addr, hdr->addr1))
4864 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
4865 if (ether_addr_equal(link_sta->addr, hdr->addr2))
4866 ether_addr_copy(hdr->addr2, rx->sta->addr);
4867 /* translate A3 only if it's the BSSID */
4868 if (!ieee80211_has_tods(hdr->frame_control) &&
4869 !ieee80211_has_fromds(hdr->frame_control)) {
4870 if (ether_addr_equal(link_sta->addr, hdr->addr3))
4871 ether_addr_copy(hdr->addr3, rx->sta->addr);
4872 else if (ether_addr_equal(link->conf->addr, hdr->addr3))
4873 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
4875 /* not needed for A4 since it can only carry the SA */
4878 ieee80211_invoke_rx_handlers(rx);
4882 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4883 struct ieee80211_sta *pubsta,
4884 struct sk_buff *skb,
4885 struct list_head *list)
4887 struct ieee80211_local *local = hw_to_local(hw);
4888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4889 struct ieee80211_fast_rx *fast_rx;
4890 struct ieee80211_rx_data rx;
4892 memset(&rx, 0, sizeof(rx));
4898 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4900 /* drop frame if too short for header */
4901 if (skb->len < sizeof(struct ethhdr))
4907 rx.sta = container_of(pubsta, struct sta_info, sta);
4908 rx.sdata = rx.sta->sdata;
4910 if (status->link_valid &&
4911 !ieee80211_rx_is_valid_sta_link_id(pubsta, status->link_id))
4915 * TODO: Should the frame be dropped if the right link_id is not
4916 * available? Or may be it is fine in the current form to proceed with
4917 * the frame processing because with frame being in 802.3 format,
4918 * link_id is used only for stats purpose and updating the stats on
4919 * the deflink is fine?
4921 if (status->link_valid)
4922 rx.link_id = status->link_id;
4924 if (rx.link_id >= 0) {
4925 struct ieee80211_link_data *link;
4927 link = rcu_dereference(rx.sdata->link[rx.link_id]);
4932 rx.link = &rx.sdata->deflink;
4935 fast_rx = rcu_dereference(rx.sta->fast_rx);
4939 ieee80211_rx_8023(&rx, fast_rx, skb->len);
4946 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
4947 struct sk_buff *skb, bool consume)
4949 struct link_sta_info *link_sta;
4950 struct ieee80211_hdr *hdr = (void *)skb->data;
4953 * Look up link station first, in case there's a
4954 * chance that they might have a link address that
4955 * is identical to the MLD address, that way we'll
4956 * have the link information if needed.
4958 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
4960 rx->sta = link_sta->sta;
4961 rx->link_id = link_sta->link_id;
4963 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4965 rx->sta = sta_info_get_bss(rx->sdata, hdr->addr2);
4967 if (status->link_valid &&
4968 !ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta,
4972 rx->link_id = status->link_valid ? status->link_id : -1;
4978 return ieee80211_prepare_and_rx_handle(rx, skb, consume);
4982 * This is the actual Rx frames handler. as it belongs to Rx path it must
4983 * be called with rcu_read_lock protection.
4985 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4986 struct ieee80211_sta *pubsta,
4987 struct sk_buff *skb,
4988 struct list_head *list)
4990 struct ieee80211_local *local = hw_to_local(hw);
4991 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4992 struct ieee80211_sub_if_data *sdata;
4993 struct ieee80211_hdr *hdr;
4995 struct ieee80211_rx_data rx;
4996 struct ieee80211_sub_if_data *prev;
4997 struct rhlist_head *tmp;
5000 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
5001 memset(&rx, 0, sizeof(rx));
5007 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
5008 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5010 if (ieee80211_is_mgmt(fc)) {
5011 /* drop frame if too short for header */
5012 if (skb->len < ieee80211_hdrlen(fc))
5015 err = skb_linearize(skb);
5017 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
5025 hdr = (struct ieee80211_hdr *)skb->data;
5026 ieee80211_parse_qos(&rx);
5027 ieee80211_verify_alignment(&rx);
5029 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5030 ieee80211_is_beacon(hdr->frame_control) ||
5031 ieee80211_is_s1g_beacon(hdr->frame_control)))
5032 ieee80211_scan_rx(local, skb);
5034 if (ieee80211_is_data(fc)) {
5035 struct sta_info *sta, *prev_sta;
5036 u8 link_id = status->link_id;
5039 rx.sta = container_of(pubsta, struct sta_info, sta);
5040 rx.sdata = rx.sta->sdata;
5042 if (status->link_valid &&
5043 !ieee80211_rx_is_valid_sta_link_id(pubsta, link_id))
5046 if (status->link_valid)
5047 rx.link_id = status->link_id;
5050 * In MLO connection, fetch the link_id using addr2
5051 * when the driver does not pass link_id in status.
5052 * When the address translation is already performed by
5053 * driver/hw, the valid link_id must be passed in
5057 if (!status->link_valid && pubsta->mlo) {
5058 struct ieee80211_hdr *hdr = (void *)skb->data;
5059 struct link_sta_info *link_sta;
5061 link_sta = link_sta_info_get_bss(rx.sdata,
5066 rx.link_id = link_sta->link_id;
5069 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5076 for_each_sta_info(local, hdr->addr2, sta, tmp) {
5082 if ((status->link_valid &&
5083 !ieee80211_rx_is_valid_sta_link_id(&prev_sta->sta,
5085 (!status->link_valid && prev_sta->sta.mlo))
5088 rx.link_id = status->link_valid ? link_id : -1;
5090 rx.sdata = prev_sta->sdata;
5091 ieee80211_prepare_and_rx_handle(&rx, skb, false);
5097 if ((status->link_valid &&
5098 !ieee80211_rx_is_valid_sta_link_id(&prev_sta->sta,
5100 (!status->link_valid && prev_sta->sta.mlo))
5103 rx.link_id = status->link_valid ? link_id : -1;
5105 rx.sdata = prev_sta->sdata;
5107 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5115 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5116 if (!ieee80211_sdata_running(sdata))
5119 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5120 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5124 * frame is destined for this interface, but if it's
5125 * not also for the previous one we handle that after
5126 * the loop to avoid copying the SKB once too much
5135 ieee80211_rx_for_interface(&rx, skb, false);
5143 if (ieee80211_rx_for_interface(&rx, skb, true))
5152 * This is the receive path handler. It is called by a low level driver when an
5153 * 802.11 MPDU is received from the hardware.
5155 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5156 struct sk_buff *skb, struct list_head *list)
5158 struct ieee80211_local *local = hw_to_local(hw);
5159 struct ieee80211_rate *rate = NULL;
5160 struct ieee80211_supported_band *sband;
5161 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5162 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5164 WARN_ON_ONCE(softirq_count() == 0);
5166 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5169 sband = local->hw.wiphy->bands[status->band];
5170 if (WARN_ON(!sband))
5174 * If we're suspending, it is possible although not too likely
5175 * that we'd be receiving frames after having already partially
5176 * quiesced the stack. We can't process such frames then since
5177 * that might, for example, cause stations to be added or other
5178 * driver callbacks be invoked.
5180 if (unlikely(local->quiescing || local->suspended))
5183 /* We might be during a HW reconfig, prevent Rx for the same reason */
5184 if (unlikely(local->in_reconfig))
5188 * The same happens when we're not even started,
5189 * but that's worth a warning.
5191 if (WARN_ON(!local->started))
5194 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5196 * Validate the rate, unless a PLCP error means that
5197 * we probably can't have a valid rate here anyway.
5200 switch (status->encoding) {
5203 * rate_idx is MCS index, which can be [0-76]
5206 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5208 * Anything else would be some sort of driver or
5209 * hardware error. The driver should catch hardware
5212 if (WARN(status->rate_idx > 76,
5213 "Rate marked as an HT rate but passed "
5214 "status->rate_idx is not "
5215 "an MCS index [0-76]: %d (0x%02x)\n",
5221 if (WARN_ONCE(status->rate_idx > 11 ||
5224 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5225 status->rate_idx, status->nss))
5229 if (WARN_ONCE(status->rate_idx > 11 ||
5232 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5233 status->rate_idx, status->nss))
5240 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5242 rate = &sband->bitrates[status->rate_idx];
5246 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5249 status->rx_flags = 0;
5251 kcov_remote_start_common(skb_get_kcov_handle(skb));
5254 * Frames with failed FCS/PLCP checksum are not returned,
5255 * all other frames are returned without radiotap header
5256 * if it was previously present.
5257 * Also, frames with less than 16 bytes are dropped.
5259 if (!(status->flag & RX_FLAG_8023))
5260 skb = ieee80211_rx_monitor(local, skb, rate);
5262 if ((status->flag & RX_FLAG_8023) ||
5263 ieee80211_is_data_present(hdr->frame_control))
5264 ieee80211_tpt_led_trig_rx(local, skb->len);
5266 if (status->flag & RX_FLAG_8023)
5267 __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5269 __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5277 EXPORT_SYMBOL(ieee80211_rx_list);
5279 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5280 struct sk_buff *skb, struct napi_struct *napi)
5282 struct sk_buff *tmp;
5287 * key references and virtual interfaces are protected using RCU
5288 * and this requires that we are in a read-side RCU section during
5289 * receive processing
5292 ieee80211_rx_list(hw, pubsta, skb, &list);
5296 netif_receive_skb_list(&list);
5300 list_for_each_entry_safe(skb, tmp, &list, list) {
5301 skb_list_del_init(skb);
5302 napi_gro_receive(napi, skb);
5305 EXPORT_SYMBOL(ieee80211_rx_napi);
5307 /* This is a version of the rx handler that can be called from hard irq
5308 * context. Post the skb on the queue and schedule the tasklet */
5309 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5311 struct ieee80211_local *local = hw_to_local(hw);
5313 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5315 skb->pkt_type = IEEE80211_RX_MSG;
5316 skb_queue_tail(&local->skb_queue, skb);
5317 tasklet_schedule(&local->tasklet);
5319 EXPORT_SYMBOL(ieee80211_rx_irqsafe);