1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
9 * Copyright (C) 2018-2021 Intel Corporation
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <linux/kcov.h>
21 #include <linux/bitops.h>
22 #include <net/mac80211.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
37 * monitor mode reception
39 * This function cleans up the SKB, i.e. it removes all the stuff
40 * only useful for monitoring.
42 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
43 unsigned int present_fcs_len,
44 unsigned int rtap_space)
46 struct ieee80211_hdr *hdr;
51 __pskb_trim(skb, skb->len - present_fcs_len);
52 __pskb_pull(skb, rtap_space);
54 hdr = (void *)skb->data;
55 fc = hdr->frame_control;
58 * Remove the HT-Control field (if present) on management
59 * frames after we've sent the frame to monitoring. We
60 * (currently) don't need it, and don't properly parse
61 * frames with it present, due to the assumption of a
62 * fixed management header length.
64 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
67 hdrlen = ieee80211_hdrlen(fc);
68 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
70 if (!pskb_may_pull(skb, hdrlen)) {
75 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
76 hdrlen - IEEE80211_HT_CTL_LEN);
77 __pskb_pull(skb, IEEE80211_HT_CTL_LEN);
82 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
83 unsigned int rtap_space)
85 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
86 struct ieee80211_hdr *hdr;
88 hdr = (void *)(skb->data + rtap_space);
90 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
91 RX_FLAG_FAILED_PLCP_CRC |
92 RX_FLAG_ONLY_MONITOR |
96 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
99 if (ieee80211_is_ctl(hdr->frame_control) &&
100 !ieee80211_is_pspoll(hdr->frame_control) &&
101 !ieee80211_is_back_req(hdr->frame_control))
108 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
109 struct ieee80211_rx_status *status,
114 /* always present fields */
115 len = sizeof(struct ieee80211_radiotap_header) + 8;
117 /* allocate extra bitmaps */
119 len += 4 * hweight8(status->chains);
120 /* vendor presence bitmap */
121 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
124 if (ieee80211_have_rx_timestamp(status)) {
128 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
131 /* antenna field, if we don't have per-chain info */
135 /* padding for RX_FLAGS if necessary */
138 if (status->encoding == RX_ENC_HT) /* HT info */
141 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
146 if (status->encoding == RX_ENC_VHT) {
151 if (local->hw.radiotap_timestamp.units_pos >= 0) {
156 if (status->encoding == RX_ENC_HE &&
157 status->flag & RX_FLAG_RADIOTAP_HE) {
160 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
163 if (status->encoding == RX_ENC_HE &&
164 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
167 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
170 if (status->flag & RX_FLAG_NO_PSDU)
173 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
176 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
179 if (status->chains) {
180 /* antenna and antenna signal fields */
181 len += 2 * hweight8(status->chains);
184 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
185 struct ieee80211_vendor_radiotap *rtap;
186 int vendor_data_offset = 0;
189 * The position to look at depends on the existence (or non-
190 * existence) of other elements, so take that into account...
192 if (status->flag & RX_FLAG_RADIOTAP_HE)
193 vendor_data_offset +=
194 sizeof(struct ieee80211_radiotap_he);
195 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
196 vendor_data_offset +=
197 sizeof(struct ieee80211_radiotap_he_mu);
198 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
199 vendor_data_offset +=
200 sizeof(struct ieee80211_radiotap_lsig);
202 rtap = (void *)&skb->data[vendor_data_offset];
204 /* alignment for fixed 6-byte vendor data header */
206 /* vendor data header */
208 if (WARN_ON(rtap->align == 0))
210 len = ALIGN(len, rtap->align);
211 len += rtap->len + rtap->pad;
217 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
222 struct ieee80211_hdr_3addr hdr;
225 } __packed __aligned(2) action;
230 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
232 if (skb->len < rtap_space + sizeof(action) +
233 VHT_MUMIMO_GROUPS_DATA_LEN)
236 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
239 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
241 if (!ieee80211_is_action(action.hdr.frame_control))
244 if (action.category != WLAN_CATEGORY_VHT)
247 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
250 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
253 skb = skb_copy(skb, GFP_ATOMIC);
257 skb_queue_tail(&sdata->skb_queue, skb);
258 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
262 * ieee80211_add_rx_radiotap_header - add radiotap header
264 * add a radiotap header containing all the fields which the hardware provided.
267 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
269 struct ieee80211_rate *rate,
270 int rtap_len, bool has_fcs)
272 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
273 struct ieee80211_radiotap_header *rthdr;
278 u16 channel_flags = 0;
280 unsigned long chains = status->chains;
281 struct ieee80211_vendor_radiotap rtap = {};
282 struct ieee80211_radiotap_he he = {};
283 struct ieee80211_radiotap_he_mu he_mu = {};
284 struct ieee80211_radiotap_lsig lsig = {};
286 if (status->flag & RX_FLAG_RADIOTAP_HE) {
287 he = *(struct ieee80211_radiotap_he *)skb->data;
288 skb_pull(skb, sizeof(he));
289 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
292 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
293 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
294 skb_pull(skb, sizeof(he_mu));
297 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
298 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
299 skb_pull(skb, sizeof(lsig));
302 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
303 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
304 /* rtap.len and rtap.pad are undone immediately */
305 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
309 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
312 rthdr = skb_push(skb, rtap_len);
313 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
314 it_present = &rthdr->it_present;
316 /* radiotap header, set always present flags */
317 rthdr->it_len = cpu_to_le16(rtap_len);
318 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
319 BIT(IEEE80211_RADIOTAP_CHANNEL) |
320 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
323 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
325 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
327 BIT(IEEE80211_RADIOTAP_EXT) |
328 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
329 put_unaligned_le32(it_present_val, it_present);
331 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
332 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
335 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
336 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
337 BIT(IEEE80211_RADIOTAP_EXT);
338 put_unaligned_le32(it_present_val, it_present);
340 it_present_val = rtap.present;
343 put_unaligned_le32(it_present_val, it_present);
345 pos = (void *)(it_present + 1);
347 /* the order of the following fields is important */
349 /* IEEE80211_RADIOTAP_TSFT */
350 if (ieee80211_have_rx_timestamp(status)) {
352 while ((pos - (u8 *)rthdr) & 7)
355 ieee80211_calculate_rx_timestamp(local, status,
358 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
362 /* IEEE80211_RADIOTAP_FLAGS */
363 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
364 *pos |= IEEE80211_RADIOTAP_F_FCS;
365 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
366 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
367 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
368 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
371 /* IEEE80211_RADIOTAP_RATE */
372 if (!rate || status->encoding != RX_ENC_LEGACY) {
374 * Without rate information don't add it. If we have,
375 * MCS information is a separate field in radiotap,
376 * added below. The byte here is needed as padding
377 * for the channel though, so initialise it to 0.
382 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
383 if (status->bw == RATE_INFO_BW_10)
385 else if (status->bw == RATE_INFO_BW_5)
387 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
391 /* IEEE80211_RADIOTAP_CHANNEL */
392 /* TODO: frequency offset in KHz */
393 put_unaligned_le16(status->freq, pos);
395 if (status->bw == RATE_INFO_BW_10)
396 channel_flags |= IEEE80211_CHAN_HALF;
397 else if (status->bw == RATE_INFO_BW_5)
398 channel_flags |= IEEE80211_CHAN_QUARTER;
400 if (status->band == NL80211_BAND_5GHZ ||
401 status->band == NL80211_BAND_6GHZ)
402 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
403 else if (status->encoding != RX_ENC_LEGACY)
404 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
405 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
406 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
408 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
410 channel_flags |= IEEE80211_CHAN_2GHZ;
411 put_unaligned_le16(channel_flags, pos);
414 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
415 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
416 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
417 *pos = status->signal;
419 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
423 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
425 if (!status->chains) {
426 /* IEEE80211_RADIOTAP_ANTENNA */
427 *pos = status->antenna;
431 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
433 /* IEEE80211_RADIOTAP_RX_FLAGS */
434 /* ensure 2 byte alignment for the 2 byte field as required */
435 if ((pos - (u8 *)rthdr) & 1)
437 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
438 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
439 put_unaligned_le16(rx_flags, pos);
442 if (status->encoding == RX_ENC_HT) {
445 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
446 *pos++ = local->hw.radiotap_mcs_details;
448 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
449 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
450 if (status->bw == RATE_INFO_BW_40)
451 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
452 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
453 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
454 if (status->enc_flags & RX_ENC_FLAG_LDPC)
455 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
456 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
457 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
459 *pos++ = status->rate_idx;
462 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
465 /* ensure 4 byte alignment */
466 while ((pos - (u8 *)rthdr) & 3)
469 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
470 put_unaligned_le32(status->ampdu_reference, pos);
472 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
473 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
474 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
475 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
476 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
477 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
478 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
479 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
480 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
481 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
482 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
483 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
484 put_unaligned_le16(flags, pos);
486 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
487 *pos++ = status->ampdu_delimiter_crc;
493 if (status->encoding == RX_ENC_VHT) {
494 u16 known = local->hw.radiotap_vht_details;
496 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
497 put_unaligned_le16(known, pos);
500 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
501 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
502 /* in VHT, STBC is binary */
503 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
504 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
505 if (status->enc_flags & RX_ENC_FLAG_BF)
506 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
509 switch (status->bw) {
510 case RATE_INFO_BW_80:
513 case RATE_INFO_BW_160:
516 case RATE_INFO_BW_40:
523 *pos = (status->rate_idx << 4) | status->nss;
526 if (status->enc_flags & RX_ENC_FLAG_LDPC)
527 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
535 if (local->hw.radiotap_timestamp.units_pos >= 0) {
537 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
540 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
542 /* ensure 8 byte alignment */
543 while ((pos - (u8 *)rthdr) & 7)
546 put_unaligned_le64(status->device_timestamp, pos);
549 if (local->hw.radiotap_timestamp.accuracy >= 0) {
550 accuracy = local->hw.radiotap_timestamp.accuracy;
551 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
553 put_unaligned_le16(accuracy, pos);
556 *pos++ = local->hw.radiotap_timestamp.units_pos;
560 if (status->encoding == RX_ENC_HE &&
561 status->flag & RX_FLAG_RADIOTAP_HE) {
562 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
564 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
565 he.data6 |= HE_PREP(DATA6_NSTS,
566 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
568 he.data3 |= HE_PREP(DATA3_STBC, 1);
570 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
573 #define CHECK_GI(s) \
574 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
575 (int)NL80211_RATE_INFO_HE_GI_##s)
581 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
582 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
583 he.data3 |= HE_PREP(DATA3_CODING,
584 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
586 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
588 switch (status->bw) {
589 case RATE_INFO_BW_20:
590 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
591 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
593 case RATE_INFO_BW_40:
594 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
595 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
597 case RATE_INFO_BW_80:
598 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
599 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
601 case RATE_INFO_BW_160:
602 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
603 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
605 case RATE_INFO_BW_HE_RU:
606 #define CHECK_RU_ALLOC(s) \
607 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
608 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
616 CHECK_RU_ALLOC(2x996);
618 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
622 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
625 /* ensure 2 byte alignment */
626 while ((pos - (u8 *)rthdr) & 1)
628 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
629 memcpy(pos, &he, sizeof(he));
633 if (status->encoding == RX_ENC_HE &&
634 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
635 /* ensure 2 byte alignment */
636 while ((pos - (u8 *)rthdr) & 1)
638 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
639 memcpy(pos, &he_mu, sizeof(he_mu));
640 pos += sizeof(he_mu);
643 if (status->flag & RX_FLAG_NO_PSDU) {
645 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
646 *pos++ = status->zero_length_psdu_type;
649 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
650 /* ensure 2 byte alignment */
651 while ((pos - (u8 *)rthdr) & 1)
653 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
654 memcpy(pos, &lsig, sizeof(lsig));
658 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
659 *pos++ = status->chain_signal[chain];
663 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
664 /* ensure 2 byte alignment for the vendor field as required */
665 if ((pos - (u8 *)rthdr) & 1)
667 *pos++ = rtap.oui[0];
668 *pos++ = rtap.oui[1];
669 *pos++ = rtap.oui[2];
671 put_unaligned_le16(rtap.len, pos);
673 /* align the actual payload as requested */
674 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
676 /* data (and possible padding) already follows */
680 static struct sk_buff *
681 ieee80211_make_monitor_skb(struct ieee80211_local *local,
682 struct sk_buff **origskb,
683 struct ieee80211_rate *rate,
684 int rtap_space, bool use_origskb)
686 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
687 int rt_hdrlen, needed_headroom;
690 /* room for the radiotap header based on driver features */
691 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
692 needed_headroom = rt_hdrlen - rtap_space;
695 /* only need to expand headroom if necessary */
700 * This shouldn't trigger often because most devices have an
701 * RX header they pull before we get here, and that should
702 * be big enough for our radiotap information. We should
703 * probably export the length to drivers so that we can have
704 * them allocate enough headroom to start with.
706 if (skb_headroom(skb) < needed_headroom &&
707 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
713 * Need to make a copy and possibly remove radiotap header
714 * and FCS from the original.
716 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
722 /* prepend radiotap information */
723 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
725 skb_reset_mac_header(skb);
726 skb->ip_summed = CHECKSUM_UNNECESSARY;
727 skb->pkt_type = PACKET_OTHERHOST;
728 skb->protocol = htons(ETH_P_802_2);
734 * This function copies a received frame to all monitor interfaces and
735 * returns a cleaned-up SKB that no longer includes the FCS nor the
736 * radiotap header the driver might have added.
738 static struct sk_buff *
739 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
740 struct ieee80211_rate *rate)
742 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
743 struct ieee80211_sub_if_data *sdata;
744 struct sk_buff *monskb = NULL;
745 int present_fcs_len = 0;
746 unsigned int rtap_space = 0;
747 struct ieee80211_sub_if_data *monitor_sdata =
748 rcu_dereference(local->monitor_sdata);
749 bool only_monitor = false;
750 unsigned int min_head_len;
752 if (status->flag & RX_FLAG_RADIOTAP_HE)
753 rtap_space += sizeof(struct ieee80211_radiotap_he);
755 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
756 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
758 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
759 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
761 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
762 struct ieee80211_vendor_radiotap *rtap =
763 (void *)(origskb->data + rtap_space);
765 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
768 min_head_len = rtap_space;
771 * First, we may need to make a copy of the skb because
772 * (1) we need to modify it for radiotap (if not present), and
773 * (2) the other RX handlers will modify the skb we got.
775 * We don't need to, of course, if we aren't going to return
776 * the SKB because it has a bad FCS/PLCP checksum.
779 if (!(status->flag & RX_FLAG_NO_PSDU)) {
780 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
781 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
784 dev_kfree_skb(origskb);
787 present_fcs_len = FCS_LEN;
790 /* also consider the hdr->frame_control */
794 /* ensure that the expected data elements are in skb head */
795 if (!pskb_may_pull(origskb, min_head_len)) {
796 dev_kfree_skb(origskb);
800 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
802 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
804 dev_kfree_skb(origskb);
808 return ieee80211_clean_skb(origskb, present_fcs_len,
812 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
814 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
815 bool last_monitor = list_is_last(&sdata->u.mntr.list,
819 monskb = ieee80211_make_monitor_skb(local, &origskb,
831 skb = skb_clone(monskb, GFP_ATOMIC);
835 skb->dev = sdata->dev;
836 dev_sw_netstats_rx_add(skb->dev, skb->len);
837 netif_receive_skb(skb);
845 /* this happens if last_monitor was erroneously false */
846 dev_kfree_skb(monskb);
852 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
855 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
857 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
858 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
859 int tid, seqno_idx, security_idx;
861 /* does the frame have a qos control field? */
862 if (ieee80211_is_data_qos(hdr->frame_control)) {
863 u8 *qc = ieee80211_get_qos_ctl(hdr);
864 /* frame has qos control */
865 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
866 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
867 status->rx_flags |= IEEE80211_RX_AMSDU;
873 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
875 * Sequence numbers for management frames, QoS data
876 * frames with a broadcast/multicast address in the
877 * Address 1 field, and all non-QoS data frames sent
878 * by QoS STAs are assigned using an additional single
879 * modulo-4096 counter, [...]
881 * We also use that counter for non-QoS STAs.
883 seqno_idx = IEEE80211_NUM_TIDS;
885 if (ieee80211_is_mgmt(hdr->frame_control))
886 security_idx = IEEE80211_NUM_TIDS;
890 rx->seqno_idx = seqno_idx;
891 rx->security_idx = security_idx;
892 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
893 * For now, set skb->priority to 0 for other cases. */
894 rx->skb->priority = (tid > 7) ? 0 : tid;
898 * DOC: Packet alignment
900 * Drivers always need to pass packets that are aligned to two-byte boundaries
903 * Additionally, should, if possible, align the payload data in a way that
904 * guarantees that the contained IP header is aligned to a four-byte
905 * boundary. In the case of regular frames, this simply means aligning the
906 * payload to a four-byte boundary (because either the IP header is directly
907 * contained, or IV/RFC1042 headers that have a length divisible by four are
908 * in front of it). If the payload data is not properly aligned and the
909 * architecture doesn't support efficient unaligned operations, mac80211
910 * will align the data.
912 * With A-MSDU frames, however, the payload data address must yield two modulo
913 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
914 * push the IP header further back to a multiple of four again. Thankfully, the
915 * specs were sane enough this time around to require padding each A-MSDU
916 * subframe to a length that is a multiple of four.
918 * Padding like Atheros hardware adds which is between the 802.11 header and
919 * the payload is not supported, the driver is required to move the 802.11
920 * header to be directly in front of the payload in that case.
922 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
924 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
925 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
932 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
934 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
936 if (is_multicast_ether_addr(hdr->addr1))
939 return ieee80211_is_robust_mgmt_frame(skb);
943 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
945 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
947 if (!is_multicast_ether_addr(hdr->addr1))
950 return ieee80211_is_robust_mgmt_frame(skb);
954 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
955 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
957 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
958 struct ieee80211_mmie *mmie;
959 struct ieee80211_mmie_16 *mmie16;
961 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
964 if (!ieee80211_is_robust_mgmt_frame(skb) &&
965 !ieee80211_is_beacon(hdr->frame_control))
966 return -1; /* not a robust management frame */
968 mmie = (struct ieee80211_mmie *)
969 (skb->data + skb->len - sizeof(*mmie));
970 if (mmie->element_id == WLAN_EID_MMIE &&
971 mmie->length == sizeof(*mmie) - 2)
972 return le16_to_cpu(mmie->key_id);
974 mmie16 = (struct ieee80211_mmie_16 *)
975 (skb->data + skb->len - sizeof(*mmie16));
976 if (skb->len >= 24 + sizeof(*mmie16) &&
977 mmie16->element_id == WLAN_EID_MMIE &&
978 mmie16->length == sizeof(*mmie16) - 2)
979 return le16_to_cpu(mmie16->key_id);
984 static int ieee80211_get_keyid(struct sk_buff *skb,
985 const struct ieee80211_cipher_scheme *cs)
987 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
995 fc = hdr->frame_control;
996 hdrlen = ieee80211_hdrlen(fc);
999 minlen = hdrlen + cs->hdr_len;
1000 key_idx_off = hdrlen + cs->key_idx_off;
1001 key_idx_shift = cs->key_idx_shift;
1003 /* WEP, TKIP, CCMP and GCMP */
1004 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1005 key_idx_off = hdrlen + 3;
1009 if (unlikely(skb->len < minlen))
1012 skb_copy_bits(skb, key_idx_off, &keyid, 1);
1015 keyid &= cs->key_idx_mask;
1016 keyid >>= key_idx_shift;
1018 /* cs could use more than the usual two bits for the keyid */
1019 if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1025 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1027 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1028 char *dev_addr = rx->sdata->vif.addr;
1030 if (ieee80211_is_data(hdr->frame_control)) {
1031 if (is_multicast_ether_addr(hdr->addr1)) {
1032 if (ieee80211_has_tods(hdr->frame_control) ||
1033 !ieee80211_has_fromds(hdr->frame_control))
1034 return RX_DROP_MONITOR;
1035 if (ether_addr_equal(hdr->addr3, dev_addr))
1036 return RX_DROP_MONITOR;
1038 if (!ieee80211_has_a4(hdr->frame_control))
1039 return RX_DROP_MONITOR;
1040 if (ether_addr_equal(hdr->addr4, dev_addr))
1041 return RX_DROP_MONITOR;
1045 /* If there is not an established peer link and this is not a peer link
1046 * establisment frame, beacon or probe, drop the frame.
1049 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1050 struct ieee80211_mgmt *mgmt;
1052 if (!ieee80211_is_mgmt(hdr->frame_control))
1053 return RX_DROP_MONITOR;
1055 if (ieee80211_is_action(hdr->frame_control)) {
1058 /* make sure category field is present */
1059 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1060 return RX_DROP_MONITOR;
1062 mgmt = (struct ieee80211_mgmt *)hdr;
1063 category = mgmt->u.action.category;
1064 if (category != WLAN_CATEGORY_MESH_ACTION &&
1065 category != WLAN_CATEGORY_SELF_PROTECTED)
1066 return RX_DROP_MONITOR;
1070 if (ieee80211_is_probe_req(hdr->frame_control) ||
1071 ieee80211_is_probe_resp(hdr->frame_control) ||
1072 ieee80211_is_beacon(hdr->frame_control) ||
1073 ieee80211_is_auth(hdr->frame_control))
1076 return RX_DROP_MONITOR;
1082 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1085 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1086 struct sk_buff *tail = skb_peek_tail(frames);
1087 struct ieee80211_rx_status *status;
1089 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1095 status = IEEE80211_SKB_RXCB(tail);
1096 if (status->flag & RX_FLAG_AMSDU_MORE)
1102 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1103 struct tid_ampdu_rx *tid_agg_rx,
1105 struct sk_buff_head *frames)
1107 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1108 struct sk_buff *skb;
1109 struct ieee80211_rx_status *status;
1111 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1113 if (skb_queue_empty(skb_list))
1116 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1117 __skb_queue_purge(skb_list);
1121 /* release frames from the reorder ring buffer */
1122 tid_agg_rx->stored_mpdu_num--;
1123 while ((skb = __skb_dequeue(skb_list))) {
1124 status = IEEE80211_SKB_RXCB(skb);
1125 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1126 __skb_queue_tail(frames, skb);
1130 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1131 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1134 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1135 struct tid_ampdu_rx *tid_agg_rx,
1137 struct sk_buff_head *frames)
1141 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1143 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1144 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1145 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1151 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1152 * the skb was added to the buffer longer than this time ago, the earlier
1153 * frames that have not yet been received are assumed to be lost and the skb
1154 * can be released for processing. This may also release other skb's from the
1155 * reorder buffer if there are no additional gaps between the frames.
1157 * Callers must hold tid_agg_rx->reorder_lock.
1159 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1161 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1162 struct tid_ampdu_rx *tid_agg_rx,
1163 struct sk_buff_head *frames)
1167 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1169 /* release the buffer until next missing frame */
1170 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1171 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1172 tid_agg_rx->stored_mpdu_num) {
1174 * No buffers ready to be released, but check whether any
1175 * frames in the reorder buffer have timed out.
1178 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1179 j = (j + 1) % tid_agg_rx->buf_size) {
1180 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1185 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1186 HT_RX_REORDER_BUF_TIMEOUT))
1187 goto set_release_timer;
1189 /* don't leave incomplete A-MSDUs around */
1190 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1191 i = (i + 1) % tid_agg_rx->buf_size)
1192 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1194 ht_dbg_ratelimited(sdata,
1195 "release an RX reorder frame due to timeout on earlier frames\n");
1196 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1200 * Increment the head seq# also for the skipped slots.
1202 tid_agg_rx->head_seq_num =
1203 (tid_agg_rx->head_seq_num +
1204 skipped) & IEEE80211_SN_MASK;
1207 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1208 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1210 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1213 if (tid_agg_rx->stored_mpdu_num) {
1214 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1216 for (; j != (index - 1) % tid_agg_rx->buf_size;
1217 j = (j + 1) % tid_agg_rx->buf_size) {
1218 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1224 if (!tid_agg_rx->removed)
1225 mod_timer(&tid_agg_rx->reorder_timer,
1226 tid_agg_rx->reorder_time[j] + 1 +
1227 HT_RX_REORDER_BUF_TIMEOUT);
1229 del_timer(&tid_agg_rx->reorder_timer);
1234 * As this function belongs to the RX path it must be under
1235 * rcu_read_lock protection. It returns false if the frame
1236 * can be processed immediately, true if it was consumed.
1238 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1239 struct tid_ampdu_rx *tid_agg_rx,
1240 struct sk_buff *skb,
1241 struct sk_buff_head *frames)
1243 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1244 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1245 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1246 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1247 u16 head_seq_num, buf_size;
1251 spin_lock(&tid_agg_rx->reorder_lock);
1254 * Offloaded BA sessions have no known starting sequence number so pick
1255 * one from first Rxed frame for this tid after BA was started.
1257 if (unlikely(tid_agg_rx->auto_seq)) {
1258 tid_agg_rx->auto_seq = false;
1259 tid_agg_rx->ssn = mpdu_seq_num;
1260 tid_agg_rx->head_seq_num = mpdu_seq_num;
1263 buf_size = tid_agg_rx->buf_size;
1264 head_seq_num = tid_agg_rx->head_seq_num;
1267 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1270 if (unlikely(!tid_agg_rx->started)) {
1271 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1275 tid_agg_rx->started = true;
1278 /* frame with out of date sequence number */
1279 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1285 * If frame the sequence number exceeds our buffering window
1286 * size release some previous frames to make room for this one.
1288 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1289 head_seq_num = ieee80211_sn_inc(
1290 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1291 /* release stored frames up to new head to stack */
1292 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1293 head_seq_num, frames);
1296 /* Now the new frame is always in the range of the reordering buffer */
1298 index = mpdu_seq_num % tid_agg_rx->buf_size;
1300 /* check if we already stored this frame */
1301 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1307 * If the current MPDU is in the right order and nothing else
1308 * is stored we can process it directly, no need to buffer it.
1309 * If it is first but there's something stored, we may be able
1310 * to release frames after this one.
1312 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1313 tid_agg_rx->stored_mpdu_num == 0) {
1314 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1315 tid_agg_rx->head_seq_num =
1316 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1321 /* put the frame in the reordering buffer */
1322 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1323 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1324 tid_agg_rx->reorder_time[index] = jiffies;
1325 tid_agg_rx->stored_mpdu_num++;
1326 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1330 spin_unlock(&tid_agg_rx->reorder_lock);
1335 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1336 * true if the MPDU was buffered, false if it should be processed.
1338 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1339 struct sk_buff_head *frames)
1341 struct sk_buff *skb = rx->skb;
1342 struct ieee80211_local *local = rx->local;
1343 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1344 struct sta_info *sta = rx->sta;
1345 struct tid_ampdu_rx *tid_agg_rx;
1349 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1350 is_multicast_ether_addr(hdr->addr1))
1354 * filter the QoS data rx stream according to
1355 * STA/TID and check if this STA/TID is on aggregation
1361 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1362 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1363 tid = ieee80211_get_tid(hdr);
1365 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1367 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1368 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1369 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1370 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1371 WLAN_BACK_RECIPIENT,
1372 WLAN_REASON_QSTA_REQUIRE_SETUP);
1376 /* qos null data frames are excluded */
1377 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1380 /* not part of a BA session */
1381 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1382 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1385 /* new, potentially un-ordered, ampdu frame - process it */
1387 /* reset session timer */
1388 if (tid_agg_rx->timeout)
1389 tid_agg_rx->last_rx = jiffies;
1391 /* if this mpdu is fragmented - terminate rx aggregation session */
1392 sc = le16_to_cpu(hdr->seq_ctrl);
1393 if (sc & IEEE80211_SCTL_FRAG) {
1394 skb_queue_tail(&rx->sdata->skb_queue, skb);
1395 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1400 * No locking needed -- we will only ever process one
1401 * RX packet at a time, and thus own tid_agg_rx. All
1402 * other code manipulating it needs to (and does) make
1403 * sure that we cannot get to it any more before doing
1406 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1411 __skb_queue_tail(frames, skb);
1414 static ieee80211_rx_result debug_noinline
1415 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1417 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1418 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1420 if (status->flag & RX_FLAG_DUP_VALIDATED)
1424 * Drop duplicate 802.11 retransmissions
1425 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1428 if (rx->skb->len < 24)
1431 if (ieee80211_is_ctl(hdr->frame_control) ||
1432 ieee80211_is_any_nullfunc(hdr->frame_control) ||
1433 is_multicast_ether_addr(hdr->addr1))
1439 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1440 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1441 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1442 rx->sta->rx_stats.num_duplicates++;
1443 return RX_DROP_UNUSABLE;
1444 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1445 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1451 static ieee80211_rx_result debug_noinline
1452 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1456 /* Drop disallowed frame classes based on STA auth/assoc state;
1457 * IEEE 802.11, Chap 5.5.
1459 * mac80211 filters only based on association state, i.e. it drops
1460 * Class 3 frames from not associated stations. hostapd sends
1461 * deauth/disassoc frames when needed. In addition, hostapd is
1462 * responsible for filtering on both auth and assoc states.
1465 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1466 return ieee80211_rx_mesh_check(rx);
1468 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1469 ieee80211_is_pspoll(hdr->frame_control)) &&
1470 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1471 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1472 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1474 * accept port control frames from the AP even when it's not
1475 * yet marked ASSOC to prevent a race where we don't set the
1476 * assoc bit quickly enough before it sends the first frame
1478 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1479 ieee80211_is_data_present(hdr->frame_control)) {
1480 unsigned int hdrlen;
1483 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1485 if (rx->skb->len < hdrlen + 8)
1486 return RX_DROP_MONITOR;
1488 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1489 if (ethertype == rx->sdata->control_port_protocol)
1493 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1494 cfg80211_rx_spurious_frame(rx->sdata->dev,
1497 return RX_DROP_UNUSABLE;
1499 return RX_DROP_MONITOR;
1506 static ieee80211_rx_result debug_noinline
1507 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1509 struct ieee80211_local *local;
1510 struct ieee80211_hdr *hdr;
1511 struct sk_buff *skb;
1515 hdr = (struct ieee80211_hdr *) skb->data;
1517 if (!local->pspolling)
1520 if (!ieee80211_has_fromds(hdr->frame_control))
1521 /* this is not from AP */
1524 if (!ieee80211_is_data(hdr->frame_control))
1527 if (!ieee80211_has_moredata(hdr->frame_control)) {
1528 /* AP has no more frames buffered for us */
1529 local->pspolling = false;
1533 /* more data bit is set, let's request a new frame from the AP */
1534 ieee80211_send_pspoll(local, rx->sdata);
1539 static void sta_ps_start(struct sta_info *sta)
1541 struct ieee80211_sub_if_data *sdata = sta->sdata;
1542 struct ieee80211_local *local = sdata->local;
1546 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1547 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1548 ps = &sdata->bss->ps;
1552 atomic_inc(&ps->num_sta_ps);
1553 set_sta_flag(sta, WLAN_STA_PS_STA);
1554 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1555 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1556 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1557 sta->sta.addr, sta->sta.aid);
1559 ieee80211_clear_fast_xmit(sta);
1561 if (!sta->sta.txq[0])
1564 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1565 struct ieee80211_txq *txq = sta->sta.txq[tid];
1566 struct txq_info *txqi = to_txq_info(txq);
1568 spin_lock(&local->active_txq_lock[txq->ac]);
1569 if (!list_empty(&txqi->schedule_order))
1570 list_del_init(&txqi->schedule_order);
1571 spin_unlock(&local->active_txq_lock[txq->ac]);
1573 if (txq_has_queue(txq))
1574 set_bit(tid, &sta->txq_buffered_tids);
1576 clear_bit(tid, &sta->txq_buffered_tids);
1580 static void sta_ps_end(struct sta_info *sta)
1582 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1583 sta->sta.addr, sta->sta.aid);
1585 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1587 * Clear the flag only if the other one is still set
1588 * so that the TX path won't start TX'ing new frames
1589 * directly ... In the case that the driver flag isn't
1590 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1592 clear_sta_flag(sta, WLAN_STA_PS_STA);
1593 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1594 sta->sta.addr, sta->sta.aid);
1598 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1599 clear_sta_flag(sta, WLAN_STA_PS_STA);
1600 ieee80211_sta_ps_deliver_wakeup(sta);
1603 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1605 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1608 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1610 /* Don't let the same PS state be set twice */
1611 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1612 if ((start && in_ps) || (!start && !in_ps))
1622 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1624 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1626 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1628 if (test_sta_flag(sta, WLAN_STA_SP))
1631 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1632 ieee80211_sta_ps_deliver_poll_response(sta);
1634 set_sta_flag(sta, WLAN_STA_PSPOLL);
1636 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1638 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1640 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1641 int ac = ieee80211_ac_from_tid(tid);
1644 * If this AC is not trigger-enabled do nothing unless the
1645 * driver is calling us after it already checked.
1647 * NB: This could/should check a separate bitmap of trigger-
1648 * enabled queues, but for now we only implement uAPSD w/o
1649 * TSPEC changes to the ACs, so they're always the same.
1651 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1652 tid != IEEE80211_NUM_TIDS)
1655 /* if we are in a service period, do nothing */
1656 if (test_sta_flag(sta, WLAN_STA_SP))
1659 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1660 ieee80211_sta_ps_deliver_uapsd(sta);
1662 set_sta_flag(sta, WLAN_STA_UAPSD);
1664 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1666 static ieee80211_rx_result debug_noinline
1667 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1669 struct ieee80211_sub_if_data *sdata = rx->sdata;
1670 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1671 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1676 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1677 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1681 * The device handles station powersave, so don't do anything about
1682 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1683 * it to mac80211 since they're handled.)
1685 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1689 * Don't do anything if the station isn't already asleep. In
1690 * the uAPSD case, the station will probably be marked asleep,
1691 * in the PS-Poll case the station must be confused ...
1693 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1696 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1697 ieee80211_sta_pspoll(&rx->sta->sta);
1699 /* Free PS Poll skb here instead of returning RX_DROP that would
1700 * count as an dropped frame. */
1701 dev_kfree_skb(rx->skb);
1704 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1705 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1706 ieee80211_has_pm(hdr->frame_control) &&
1707 (ieee80211_is_data_qos(hdr->frame_control) ||
1708 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1709 u8 tid = ieee80211_get_tid(hdr);
1711 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1717 static ieee80211_rx_result debug_noinline
1718 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1720 struct sta_info *sta = rx->sta;
1721 struct sk_buff *skb = rx->skb;
1722 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1723 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1730 * Update last_rx only for IBSS packets which are for the current
1731 * BSSID and for station already AUTHORIZED to avoid keeping the
1732 * current IBSS network alive in cases where other STAs start
1733 * using different BSSID. This will also give the station another
1734 * chance to restart the authentication/authorization in case
1735 * something went wrong the first time.
1737 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1738 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1739 NL80211_IFTYPE_ADHOC);
1740 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1741 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1742 sta->rx_stats.last_rx = jiffies;
1743 if (ieee80211_is_data(hdr->frame_control) &&
1744 !is_multicast_ether_addr(hdr->addr1))
1745 sta->rx_stats.last_rate =
1746 sta_stats_encode_rate(status);
1748 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1749 sta->rx_stats.last_rx = jiffies;
1750 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1751 !is_multicast_ether_addr(hdr->addr1)) {
1753 * Mesh beacons will update last_rx when if they are found to
1754 * match the current local configuration when processed.
1756 sta->rx_stats.last_rx = jiffies;
1757 if (ieee80211_is_data(hdr->frame_control))
1758 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1761 sta->rx_stats.fragments++;
1763 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1764 sta->rx_stats.bytes += rx->skb->len;
1765 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1767 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1768 sta->rx_stats.last_signal = status->signal;
1769 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1772 if (status->chains) {
1773 sta->rx_stats.chains = status->chains;
1774 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1775 int signal = status->chain_signal[i];
1777 if (!(status->chains & BIT(i)))
1780 sta->rx_stats.chain_signal_last[i] = signal;
1781 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1786 if (ieee80211_is_s1g_beacon(hdr->frame_control))
1790 * Change STA power saving mode only at the end of a frame
1791 * exchange sequence, and only for a data or management
1792 * frame as specified in IEEE 802.11-2016 11.2.3.2
1794 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1795 !ieee80211_has_morefrags(hdr->frame_control) &&
1796 !is_multicast_ether_addr(hdr->addr1) &&
1797 (ieee80211_is_mgmt(hdr->frame_control) ||
1798 ieee80211_is_data(hdr->frame_control)) &&
1799 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1800 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1801 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1802 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1803 if (!ieee80211_has_pm(hdr->frame_control))
1806 if (ieee80211_has_pm(hdr->frame_control))
1811 /* mesh power save support */
1812 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1813 ieee80211_mps_rx_h_sta_process(sta, hdr);
1816 * Drop (qos-)data::nullfunc frames silently, since they
1817 * are used only to control station power saving mode.
1819 if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1820 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1823 * If we receive a 4-addr nullfunc frame from a STA
1824 * that was not moved to a 4-addr STA vlan yet send
1825 * the event to userspace and for older hostapd drop
1826 * the frame to the monitor interface.
1828 if (ieee80211_has_a4(hdr->frame_control) &&
1829 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1830 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1831 !rx->sdata->u.vlan.sta))) {
1832 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1833 cfg80211_rx_unexpected_4addr_frame(
1834 rx->sdata->dev, sta->sta.addr,
1836 return RX_DROP_MONITOR;
1839 * Update counter and free packet here to avoid
1840 * counting this as a dropped packed.
1842 sta->rx_stats.packets++;
1843 dev_kfree_skb(rx->skb);
1848 } /* ieee80211_rx_h_sta_process */
1850 static struct ieee80211_key *
1851 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1853 struct ieee80211_key *key = NULL;
1854 struct ieee80211_sub_if_data *sdata = rx->sdata;
1857 /* Make sure key gets set if either BIGTK key index is set so that
1858 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1859 * Beacon frames and Beacon frames that claim to use another BIGTK key
1860 * index (i.e., a key that we do not have).
1864 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1867 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1874 key = rcu_dereference(rx->sta->gtk[idx]);
1876 key = rcu_dereference(sdata->keys[idx]);
1877 if (!key && rx->sta)
1878 key = rcu_dereference(rx->sta->gtk[idx2]);
1880 key = rcu_dereference(sdata->keys[idx2]);
1885 static ieee80211_rx_result debug_noinline
1886 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1888 struct sk_buff *skb = rx->skb;
1889 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1890 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1892 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1893 struct ieee80211_key *sta_ptk = NULL;
1894 struct ieee80211_key *ptk_idx = NULL;
1895 int mmie_keyidx = -1;
1897 const struct ieee80211_cipher_scheme *cs = NULL;
1899 if (ieee80211_is_ext(hdr->frame_control))
1905 * There are five types of keys:
1906 * - GTK (group keys)
1907 * - IGTK (group keys for management frames)
1908 * - BIGTK (group keys for Beacon frames)
1909 * - PTK (pairwise keys)
1910 * - STK (station-to-station pairwise keys)
1912 * When selecting a key, we have to distinguish between multicast
1913 * (including broadcast) and unicast frames, the latter can only
1914 * use PTKs and STKs while the former always use GTKs, IGTKs, and
1915 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1916 * then unicast frames can also use key indices like GTKs. Hence, if we
1917 * don't have a PTK/STK we check the key index for a WEP key.
1919 * Note that in a regular BSS, multicast frames are sent by the
1920 * AP only, associated stations unicast the frame to the AP first
1921 * which then multicasts it on their behalf.
1923 * There is also a slight problem in IBSS mode: GTKs are negotiated
1924 * with each station, that is something we don't currently handle.
1925 * The spec seems to expect that one negotiates the same key with
1926 * every station but there's no such requirement; VLANs could be
1930 /* start without a key */
1932 fc = hdr->frame_control;
1935 int keyid = rx->sta->ptk_idx;
1936 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1938 if (ieee80211_has_protected(fc)) {
1939 cs = rx->sta->cipher_scheme;
1940 keyid = ieee80211_get_keyid(rx->skb, cs);
1942 if (unlikely(keyid < 0))
1943 return RX_DROP_UNUSABLE;
1945 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1949 if (!ieee80211_has_protected(fc))
1950 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1952 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1953 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1954 if ((status->flag & RX_FLAG_DECRYPTED) &&
1955 (status->flag & RX_FLAG_IV_STRIPPED))
1957 /* Skip decryption if the frame is not protected. */
1958 if (!ieee80211_has_protected(fc))
1960 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1961 /* Broadcast/multicast robust management frame / BIP */
1962 if ((status->flag & RX_FLAG_DECRYPTED) &&
1963 (status->flag & RX_FLAG_IV_STRIPPED))
1966 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1967 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1968 NUM_DEFAULT_BEACON_KEYS) {
1969 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1972 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1975 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1977 return RX_CONTINUE; /* Beacon protection not in use */
1978 } else if (mmie_keyidx >= 0) {
1979 /* Broadcast/multicast robust management frame / BIP */
1980 if ((status->flag & RX_FLAG_DECRYPTED) &&
1981 (status->flag & RX_FLAG_IV_STRIPPED))
1984 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1985 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1986 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1988 if (ieee80211_is_group_privacy_action(skb) &&
1989 test_sta_flag(rx->sta, WLAN_STA_MFP))
1990 return RX_DROP_MONITOR;
1992 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1995 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1996 } else if (!ieee80211_has_protected(fc)) {
1998 * The frame was not protected, so skip decryption. However, we
1999 * need to set rx->key if there is a key that could have been
2000 * used so that the frame may be dropped if encryption would
2001 * have been expected.
2003 struct ieee80211_key *key = NULL;
2004 struct ieee80211_sub_if_data *sdata = rx->sdata;
2007 if (ieee80211_is_beacon(fc)) {
2008 key = ieee80211_rx_get_bigtk(rx, -1);
2009 } else if (ieee80211_is_mgmt(fc) &&
2010 is_multicast_ether_addr(hdr->addr1)) {
2011 key = rcu_dereference(rx->sdata->default_mgmt_key);
2014 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2015 key = rcu_dereference(rx->sta->gtk[i]);
2021 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2022 key = rcu_dereference(sdata->keys[i]);
2033 * The device doesn't give us the IV so we won't be
2034 * able to look up the key. That's ok though, we
2035 * don't need to decrypt the frame, we just won't
2036 * be able to keep statistics accurate.
2037 * Except for key threshold notifications, should
2038 * we somehow allow the driver to tell us which key
2039 * the hardware used if this flag is set?
2041 if ((status->flag & RX_FLAG_DECRYPTED) &&
2042 (status->flag & RX_FLAG_IV_STRIPPED))
2045 keyidx = ieee80211_get_keyid(rx->skb, cs);
2047 if (unlikely(keyidx < 0))
2048 return RX_DROP_UNUSABLE;
2050 /* check per-station GTK first, if multicast packet */
2051 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2052 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2054 /* if not found, try default key */
2056 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2059 * RSNA-protected unicast frames should always be
2060 * sent with pairwise or station-to-station keys,
2061 * but for WEP we allow using a key index as well.
2064 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2065 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2066 !is_multicast_ether_addr(hdr->addr1))
2072 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2073 return RX_DROP_MONITOR;
2075 /* TODO: add threshold stuff again */
2077 return RX_DROP_MONITOR;
2080 switch (rx->key->conf.cipher) {
2081 case WLAN_CIPHER_SUITE_WEP40:
2082 case WLAN_CIPHER_SUITE_WEP104:
2083 result = ieee80211_crypto_wep_decrypt(rx);
2085 case WLAN_CIPHER_SUITE_TKIP:
2086 result = ieee80211_crypto_tkip_decrypt(rx);
2088 case WLAN_CIPHER_SUITE_CCMP:
2089 result = ieee80211_crypto_ccmp_decrypt(
2090 rx, IEEE80211_CCMP_MIC_LEN);
2092 case WLAN_CIPHER_SUITE_CCMP_256:
2093 result = ieee80211_crypto_ccmp_decrypt(
2094 rx, IEEE80211_CCMP_256_MIC_LEN);
2096 case WLAN_CIPHER_SUITE_AES_CMAC:
2097 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2099 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2100 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2102 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2103 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2104 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2106 case WLAN_CIPHER_SUITE_GCMP:
2107 case WLAN_CIPHER_SUITE_GCMP_256:
2108 result = ieee80211_crypto_gcmp_decrypt(rx);
2111 result = ieee80211_crypto_hw_decrypt(rx);
2114 /* the hdr variable is invalid after the decrypt handlers */
2116 /* either the frame has been decrypted or will be dropped */
2117 status->flag |= RX_FLAG_DECRYPTED;
2119 if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
2120 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2121 skb->data, skb->len);
2126 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2130 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2131 skb_queue_head_init(&cache->entries[i].skb_list);
2134 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2138 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2139 __skb_queue_purge(&cache->entries[i].skb_list);
2142 static inline struct ieee80211_fragment_entry *
2143 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2144 unsigned int frag, unsigned int seq, int rx_queue,
2145 struct sk_buff **skb)
2147 struct ieee80211_fragment_entry *entry;
2149 entry = &cache->entries[cache->next++];
2150 if (cache->next >= IEEE80211_FRAGMENT_MAX)
2153 __skb_queue_purge(&entry->skb_list);
2155 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2157 entry->first_frag_time = jiffies;
2159 entry->rx_queue = rx_queue;
2160 entry->last_frag = frag;
2161 entry->check_sequential_pn = false;
2162 entry->extra_len = 0;
2167 static inline struct ieee80211_fragment_entry *
2168 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2169 unsigned int frag, unsigned int seq,
2170 int rx_queue, struct ieee80211_hdr *hdr)
2172 struct ieee80211_fragment_entry *entry;
2176 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2177 struct ieee80211_hdr *f_hdr;
2178 struct sk_buff *f_skb;
2182 idx = IEEE80211_FRAGMENT_MAX - 1;
2184 entry = &cache->entries[idx];
2185 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2186 entry->rx_queue != rx_queue ||
2187 entry->last_frag + 1 != frag)
2190 f_skb = __skb_peek(&entry->skb_list);
2191 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2194 * Check ftype and addresses are equal, else check next fragment
2196 if (((hdr->frame_control ^ f_hdr->frame_control) &
2197 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2198 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2199 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2202 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2203 __skb_queue_purge(&entry->skb_list);
2212 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2215 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2216 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2217 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2218 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2219 ieee80211_has_protected(fc);
2222 static ieee80211_rx_result debug_noinline
2223 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2225 struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2226 struct ieee80211_hdr *hdr;
2229 unsigned int frag, seq;
2230 struct ieee80211_fragment_entry *entry;
2231 struct sk_buff *skb;
2232 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2234 hdr = (struct ieee80211_hdr *)rx->skb->data;
2235 fc = hdr->frame_control;
2237 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2240 sc = le16_to_cpu(hdr->seq_ctrl);
2241 frag = sc & IEEE80211_SCTL_FRAG;
2243 if (is_multicast_ether_addr(hdr->addr1)) {
2244 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2249 cache = &rx->sta->frags;
2251 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2254 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2256 if (skb_linearize(rx->skb))
2257 return RX_DROP_UNUSABLE;
2260 * skb_linearize() might change the skb->data and
2261 * previously cached variables (in this case, hdr) need to
2262 * be refreshed with the new data.
2264 hdr = (struct ieee80211_hdr *)rx->skb->data;
2265 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2268 /* This is the first fragment of a new frame. */
2269 entry = ieee80211_reassemble_add(cache, frag, seq,
2270 rx->seqno_idx, &(rx->skb));
2271 if (requires_sequential_pn(rx, fc)) {
2272 int queue = rx->security_idx;
2274 /* Store CCMP/GCMP PN so that we can verify that the
2275 * next fragment has a sequential PN value.
2277 entry->check_sequential_pn = true;
2278 entry->is_protected = true;
2279 entry->key_color = rx->key->color;
2280 memcpy(entry->last_pn,
2281 rx->key->u.ccmp.rx_pn[queue],
2282 IEEE80211_CCMP_PN_LEN);
2283 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2285 offsetof(struct ieee80211_key,
2287 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2288 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2289 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2290 IEEE80211_GCMP_PN_LEN);
2291 } else if (rx->key &&
2292 (ieee80211_has_protected(fc) ||
2293 (status->flag & RX_FLAG_DECRYPTED))) {
2294 entry->is_protected = true;
2295 entry->key_color = rx->key->color;
2300 /* This is a fragment for a frame that should already be pending in
2301 * fragment cache. Add this fragment to the end of the pending entry.
2303 entry = ieee80211_reassemble_find(cache, frag, seq,
2304 rx->seqno_idx, hdr);
2306 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2307 return RX_DROP_MONITOR;
2310 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2311 * MPDU PN values are not incrementing in steps of 1."
2312 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2313 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2315 if (entry->check_sequential_pn) {
2317 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2319 if (!requires_sequential_pn(rx, fc))
2320 return RX_DROP_UNUSABLE;
2322 /* Prevent mixed key and fragment cache attacks */
2323 if (entry->key_color != rx->key->color)
2324 return RX_DROP_UNUSABLE;
2326 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2327 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2333 rpn = rx->ccm_gcm.pn;
2334 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2335 return RX_DROP_UNUSABLE;
2336 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2337 } else if (entry->is_protected &&
2339 (!ieee80211_has_protected(fc) &&
2340 !(status->flag & RX_FLAG_DECRYPTED)) ||
2341 rx->key->color != entry->key_color)) {
2342 /* Drop this as a mixed key or fragment cache attack, even
2343 * if for TKIP Michael MIC should protect us, and WEP is a
2344 * lost cause anyway.
2346 return RX_DROP_UNUSABLE;
2347 } else if (entry->is_protected && rx->key &&
2348 entry->key_color != rx->key->color &&
2349 (status->flag & RX_FLAG_DECRYPTED)) {
2350 return RX_DROP_UNUSABLE;
2353 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2354 __skb_queue_tail(&entry->skb_list, rx->skb);
2355 entry->last_frag = frag;
2356 entry->extra_len += rx->skb->len;
2357 if (ieee80211_has_morefrags(fc)) {
2362 rx->skb = __skb_dequeue(&entry->skb_list);
2363 if (skb_tailroom(rx->skb) < entry->extra_len) {
2364 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2365 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2367 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2368 __skb_queue_purge(&entry->skb_list);
2369 return RX_DROP_UNUSABLE;
2372 while ((skb = __skb_dequeue(&entry->skb_list))) {
2373 skb_put_data(rx->skb, skb->data, skb->len);
2378 ieee80211_led_rx(rx->local);
2381 rx->sta->rx_stats.packets++;
2385 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2387 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2393 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2395 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
2396 struct sk_buff *skb = rx->skb;
2397 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2400 * Pass through unencrypted frames if the hardware has
2401 * decrypted them already.
2403 if (status->flag & RX_FLAG_DECRYPTED)
2406 /* check mesh EAPOL frames first */
2407 if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) &&
2408 ieee80211_is_data(fc))) {
2409 struct ieee80211s_hdr *mesh_hdr;
2410 u16 hdr_len = ieee80211_hdrlen(fc);
2411 u16 ethertype_offset;
2414 if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr))
2417 /* make sure fixed part of mesh header is there, also checks skb len */
2418 if (!pskb_may_pull(rx->skb, hdr_len + 6))
2421 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len);
2422 ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) +
2423 sizeof(rfc1042_header);
2425 if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 &&
2426 ethertype == rx->sdata->control_port_protocol)
2431 /* Drop unencrypted frames if key is set. */
2432 if (unlikely(!ieee80211_has_protected(fc) &&
2433 !ieee80211_is_any_nullfunc(fc) &&
2434 ieee80211_is_data(fc) && rx->key))
2440 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2443 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2444 __le16 fc = hdr->frame_control;
2447 * Pass through unencrypted frames if the hardware has
2448 * decrypted them already.
2450 if (status->flag & RX_FLAG_DECRYPTED)
2453 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2454 if (unlikely(!ieee80211_has_protected(fc) &&
2455 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2457 if (ieee80211_is_deauth(fc) ||
2458 ieee80211_is_disassoc(fc))
2459 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2464 /* BIP does not use Protected field, so need to check MMIE */
2465 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2466 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2467 if (ieee80211_is_deauth(fc) ||
2468 ieee80211_is_disassoc(fc))
2469 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2474 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2475 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2476 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2482 * When using MFP, Action frames are not allowed prior to
2483 * having configured keys.
2485 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2486 ieee80211_is_robust_mgmt_frame(rx->skb)))
2494 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2496 struct ieee80211_sub_if_data *sdata = rx->sdata;
2497 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2498 bool check_port_control = false;
2499 struct ethhdr *ehdr;
2502 *port_control = false;
2503 if (ieee80211_has_a4(hdr->frame_control) &&
2504 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2507 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2508 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2510 if (!sdata->u.mgd.use_4addr)
2512 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2513 check_port_control = true;
2516 if (is_multicast_ether_addr(hdr->addr1) &&
2517 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2520 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2524 ehdr = (struct ethhdr *) rx->skb->data;
2525 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2526 *port_control = true;
2527 else if (check_port_control)
2534 * requires that rx->skb is a frame with ethernet header
2536 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2538 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2539 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2540 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2543 * Allow EAPOL frames to us/the PAE group address regardless of
2544 * whether the frame was encrypted or not, and always disallow
2545 * all other destination addresses for them.
2547 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2548 return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2549 ether_addr_equal(ehdr->h_dest, pae_group_addr);
2551 if (ieee80211_802_1x_port_control(rx) ||
2552 ieee80211_drop_unencrypted(rx, fc))
2558 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2559 struct ieee80211_rx_data *rx)
2561 struct ieee80211_sub_if_data *sdata = rx->sdata;
2562 struct net_device *dev = sdata->dev;
2564 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2565 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2566 !sdata->control_port_no_preauth)) &&
2567 sdata->control_port_over_nl80211)) {
2568 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2571 cfg80211_rx_control_port(dev, skb, noencrypt);
2574 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2576 memset(skb->cb, 0, sizeof(skb->cb));
2579 * 802.1X over 802.11 requires that the authenticator address
2580 * be used for EAPOL frames. However, 802.1X allows the use of
2581 * the PAE group address instead. If the interface is part of
2582 * a bridge and we pass the frame with the PAE group address,
2583 * then the bridge will forward it to the network (even if the
2584 * client was not associated yet), which isn't supposed to
2586 * To avoid that, rewrite the destination address to our own
2587 * address, so that the authenticator (e.g. hostapd) will see
2588 * the frame, but bridge won't forward it anywhere else. Note
2589 * that due to earlier filtering, the only other address can
2590 * be the PAE group address.
2592 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2593 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2594 ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2596 /* deliver to local stack */
2598 list_add_tail(&skb->list, rx->list);
2600 netif_receive_skb(skb);
2605 * requires that rx->skb is a frame with ethernet header
2608 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2610 struct ieee80211_sub_if_data *sdata = rx->sdata;
2611 struct net_device *dev = sdata->dev;
2612 struct sk_buff *skb, *xmit_skb;
2613 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2614 struct sta_info *dsta;
2619 dev_sw_netstats_rx_add(dev, skb->len);
2622 /* The seqno index has the same property as needed
2623 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2624 * for non-QoS-data frames. Here we know it's a data
2625 * frame, so count MSDUs.
2627 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2628 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2629 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2632 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2633 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2634 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2635 ehdr->h_proto != rx->sdata->control_port_protocol &&
2636 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2637 if (is_multicast_ether_addr(ehdr->h_dest) &&
2638 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2640 * send multicast frames both to higher layers in
2641 * local net stack and back to the wireless medium
2643 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2645 net_info_ratelimited("%s: failed to clone multicast frame\n",
2647 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2648 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2649 dsta = sta_info_get(sdata, ehdr->h_dest);
2652 * The destination station is associated to
2653 * this AP (in this VLAN), so send the frame
2654 * directly to it and do not pass it to local
2663 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2665 /* 'align' will only take the values 0 or 2 here since all
2666 * frames are required to be aligned to 2-byte boundaries
2667 * when being passed to mac80211; the code here works just
2668 * as well if that isn't true, but mac80211 assumes it can
2669 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2673 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2675 if (WARN_ON(skb_headroom(skb) < 3)) {
2679 u8 *data = skb->data;
2680 size_t len = skb_headlen(skb);
2682 memmove(skb->data, data, len);
2683 skb_set_tail_pointer(skb, len);
2690 skb->protocol = eth_type_trans(skb, dev);
2691 ieee80211_deliver_skb_to_local_stack(skb, rx);
2696 * Send to wireless media and increase priority by 256 to
2697 * keep the received priority instead of reclassifying
2698 * the frame (see cfg80211_classify8021d).
2700 xmit_skb->priority += 256;
2701 xmit_skb->protocol = htons(ETH_P_802_3);
2702 skb_reset_network_header(xmit_skb);
2703 skb_reset_mac_header(xmit_skb);
2704 dev_queue_xmit(xmit_skb);
2708 static ieee80211_rx_result debug_noinline
2709 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2711 struct net_device *dev = rx->sdata->dev;
2712 struct sk_buff *skb = rx->skb;
2713 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2714 __le16 fc = hdr->frame_control;
2715 struct sk_buff_head frame_list;
2716 struct ethhdr ethhdr;
2717 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2719 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2722 } else switch (rx->sdata->vif.type) {
2723 case NL80211_IFTYPE_AP:
2724 case NL80211_IFTYPE_AP_VLAN:
2727 case NL80211_IFTYPE_STATION:
2729 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2732 case NL80211_IFTYPE_MESH_POINT:
2740 __skb_queue_head_init(&frame_list);
2742 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2743 rx->sdata->vif.addr,
2744 rx->sdata->vif.type,
2746 return RX_DROP_UNUSABLE;
2748 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2749 rx->sdata->vif.type,
2750 rx->local->hw.extra_tx_headroom,
2751 check_da, check_sa);
2753 while (!skb_queue_empty(&frame_list)) {
2754 rx->skb = __skb_dequeue(&frame_list);
2756 if (!ieee80211_frame_allowed(rx, fc)) {
2757 dev_kfree_skb(rx->skb);
2761 ieee80211_deliver_skb(rx);
2767 static ieee80211_rx_result debug_noinline
2768 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2770 struct sk_buff *skb = rx->skb;
2771 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2772 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2773 __le16 fc = hdr->frame_control;
2775 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2778 if (unlikely(!ieee80211_is_data(fc)))
2781 if (unlikely(!ieee80211_is_data_present(fc)))
2782 return RX_DROP_MONITOR;
2784 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2785 switch (rx->sdata->vif.type) {
2786 case NL80211_IFTYPE_AP_VLAN:
2787 if (!rx->sdata->u.vlan.sta)
2788 return RX_DROP_UNUSABLE;
2790 case NL80211_IFTYPE_STATION:
2791 if (!rx->sdata->u.mgd.use_4addr)
2792 return RX_DROP_UNUSABLE;
2795 return RX_DROP_UNUSABLE;
2799 if (is_multicast_ether_addr(hdr->addr1))
2800 return RX_DROP_UNUSABLE;
2804 * We should not receive A-MSDUs on pre-HT connections,
2805 * and HT connections cannot use old ciphers. Thus drop
2806 * them, as in those cases we couldn't even have SPP
2809 switch (rx->key->conf.cipher) {
2810 case WLAN_CIPHER_SUITE_WEP40:
2811 case WLAN_CIPHER_SUITE_WEP104:
2812 case WLAN_CIPHER_SUITE_TKIP:
2813 return RX_DROP_UNUSABLE;
2819 return __ieee80211_rx_h_amsdu(rx, 0);
2822 #ifdef CONFIG_MAC80211_MESH
2823 static ieee80211_rx_result
2824 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2826 struct ieee80211_hdr *fwd_hdr, *hdr;
2827 struct ieee80211_tx_info *info;
2828 struct ieee80211s_hdr *mesh_hdr;
2829 struct sk_buff *skb = rx->skb, *fwd_skb;
2830 struct ieee80211_local *local = rx->local;
2831 struct ieee80211_sub_if_data *sdata = rx->sdata;
2832 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2836 hdr = (struct ieee80211_hdr *) skb->data;
2837 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2839 /* make sure fixed part of mesh header is there, also checks skb len */
2840 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2841 return RX_DROP_MONITOR;
2843 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2845 /* make sure full mesh header is there, also checks skb len */
2846 if (!pskb_may_pull(rx->skb,
2847 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2848 return RX_DROP_MONITOR;
2850 /* reload pointers */
2851 hdr = (struct ieee80211_hdr *) skb->data;
2852 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2854 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2855 return RX_DROP_MONITOR;
2857 /* frame is in RMC, don't forward */
2858 if (ieee80211_is_data(hdr->frame_control) &&
2859 is_multicast_ether_addr(hdr->addr1) &&
2860 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2861 return RX_DROP_MONITOR;
2863 if (!ieee80211_is_data(hdr->frame_control))
2867 return RX_DROP_MONITOR;
2869 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2870 struct mesh_path *mppath;
2874 if (is_multicast_ether_addr(hdr->addr1)) {
2875 mpp_addr = hdr->addr3;
2876 proxied_addr = mesh_hdr->eaddr1;
2877 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2878 MESH_FLAGS_AE_A5_A6) {
2879 /* has_a4 already checked in ieee80211_rx_mesh_check */
2880 mpp_addr = hdr->addr4;
2881 proxied_addr = mesh_hdr->eaddr2;
2883 return RX_DROP_MONITOR;
2887 mppath = mpp_path_lookup(sdata, proxied_addr);
2889 mpp_path_add(sdata, proxied_addr, mpp_addr);
2891 spin_lock_bh(&mppath->state_lock);
2892 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2893 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2894 mppath->exp_time = jiffies;
2895 spin_unlock_bh(&mppath->state_lock);
2900 /* Frame has reached destination. Don't forward */
2901 if (!is_multicast_ether_addr(hdr->addr1) &&
2902 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2905 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2906 q = sdata->vif.hw_queue[ac];
2907 if (ieee80211_queue_stopped(&local->hw, q)) {
2908 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2909 return RX_DROP_MONITOR;
2911 skb_set_queue_mapping(skb, q);
2913 if (!--mesh_hdr->ttl) {
2914 if (!is_multicast_ether_addr(hdr->addr1))
2915 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2916 dropped_frames_ttl);
2920 if (!ifmsh->mshcfg.dot11MeshForwarding)
2923 if (sdata->crypto_tx_tailroom_needed_cnt)
2924 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2926 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2927 sdata->encrypt_headroom,
2928 tailroom, GFP_ATOMIC);
2932 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2933 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2934 info = IEEE80211_SKB_CB(fwd_skb);
2935 memset(info, 0, sizeof(*info));
2936 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2937 info->control.vif = &rx->sdata->vif;
2938 info->control.jiffies = jiffies;
2939 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2940 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2941 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2942 /* update power mode indication when forwarding */
2943 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2944 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2945 /* mesh power mode flags updated in mesh_nexthop_lookup */
2946 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2948 /* unable to resolve next hop */
2949 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2951 WLAN_REASON_MESH_PATH_NOFORWARD,
2953 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2955 return RX_DROP_MONITOR;
2958 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2959 ieee80211_add_pending_skb(local, fwd_skb);
2961 if (is_multicast_ether_addr(hdr->addr1))
2963 return RX_DROP_MONITOR;
2967 static ieee80211_rx_result debug_noinline
2968 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2970 struct ieee80211_sub_if_data *sdata = rx->sdata;
2971 struct ieee80211_local *local = rx->local;
2972 struct net_device *dev = sdata->dev;
2973 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2974 __le16 fc = hdr->frame_control;
2978 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2981 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2982 return RX_DROP_MONITOR;
2985 * Send unexpected-4addr-frame event to hostapd. For older versions,
2986 * also drop the frame to cooked monitor interfaces.
2988 if (ieee80211_has_a4(hdr->frame_control) &&
2989 sdata->vif.type == NL80211_IFTYPE_AP) {
2991 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2992 cfg80211_rx_unexpected_4addr_frame(
2993 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2994 return RX_DROP_MONITOR;
2997 err = __ieee80211_data_to_8023(rx, &port_control);
2999 return RX_DROP_UNUSABLE;
3001 if (!ieee80211_frame_allowed(rx, fc))
3002 return RX_DROP_MONITOR;
3004 /* directly handle TDLS channel switch requests/responses */
3005 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3006 cpu_to_be16(ETH_P_TDLS))) {
3007 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3009 if (pskb_may_pull(rx->skb,
3010 offsetof(struct ieee80211_tdls_data, u)) &&
3011 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3012 tf->category == WLAN_CATEGORY_TDLS &&
3013 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3014 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3015 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
3016 schedule_work(&local->tdls_chsw_work);
3018 rx->sta->rx_stats.packets++;
3024 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3025 unlikely(port_control) && sdata->bss) {
3026 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3034 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3035 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3036 !is_multicast_ether_addr(
3037 ((struct ethhdr *)rx->skb->data)->h_dest) &&
3038 (!local->scanning &&
3039 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3040 mod_timer(&local->dynamic_ps_timer, jiffies +
3041 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3043 ieee80211_deliver_skb(rx);
3048 static ieee80211_rx_result debug_noinline
3049 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3051 struct sk_buff *skb = rx->skb;
3052 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3053 struct tid_ampdu_rx *tid_agg_rx;
3057 if (likely(!ieee80211_is_ctl(bar->frame_control)))
3060 if (ieee80211_is_back_req(bar->frame_control)) {
3062 __le16 control, start_seq_num;
3063 } __packed bar_data;
3064 struct ieee80211_event event = {
3065 .type = BAR_RX_EVENT,
3069 return RX_DROP_MONITOR;
3071 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3072 &bar_data, sizeof(bar_data)))
3073 return RX_DROP_MONITOR;
3075 tid = le16_to_cpu(bar_data.control) >> 12;
3077 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3078 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3079 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3080 WLAN_BACK_RECIPIENT,
3081 WLAN_REASON_QSTA_REQUIRE_SETUP);
3083 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3085 return RX_DROP_MONITOR;
3087 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3088 event.u.ba.tid = tid;
3089 event.u.ba.ssn = start_seq_num;
3090 event.u.ba.sta = &rx->sta->sta;
3092 /* reset session timer */
3093 if (tid_agg_rx->timeout)
3094 mod_timer(&tid_agg_rx->session_timer,
3095 TU_TO_EXP_TIME(tid_agg_rx->timeout));
3097 spin_lock(&tid_agg_rx->reorder_lock);
3098 /* release stored frames up to start of BAR */
3099 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3100 start_seq_num, frames);
3101 spin_unlock(&tid_agg_rx->reorder_lock);
3103 drv_event_callback(rx->local, rx->sdata, &event);
3110 * After this point, we only want management frames,
3111 * so we can drop all remaining control frames to
3112 * cooked monitor interfaces.
3114 return RX_DROP_MONITOR;
3117 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3118 struct ieee80211_mgmt *mgmt,
3121 struct ieee80211_local *local = sdata->local;
3122 struct sk_buff *skb;
3123 struct ieee80211_mgmt *resp;
3125 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3126 /* Not to own unicast address */
3130 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
3131 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
3132 /* Not from the current AP or not associated yet. */
3136 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3137 /* Too short SA Query request frame */
3141 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3145 skb_reserve(skb, local->hw.extra_tx_headroom);
3146 resp = skb_put_zero(skb, 24);
3147 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3148 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3149 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
3150 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3151 IEEE80211_STYPE_ACTION);
3152 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3153 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3154 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3155 memcpy(resp->u.action.u.sa_query.trans_id,
3156 mgmt->u.action.u.sa_query.trans_id,
3157 WLAN_SA_QUERY_TR_ID_LEN);
3159 ieee80211_tx_skb(sdata, skb);
3162 static ieee80211_rx_result debug_noinline
3163 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3165 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3166 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3168 if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3172 * From here on, look only at management frames.
3173 * Data and control frames are already handled,
3174 * and unknown (reserved) frames are useless.
3176 if (rx->skb->len < 24)
3177 return RX_DROP_MONITOR;
3179 if (!ieee80211_is_mgmt(mgmt->frame_control))
3180 return RX_DROP_MONITOR;
3182 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3183 ieee80211_is_beacon(mgmt->frame_control) &&
3184 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3187 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3188 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3189 sig = status->signal;
3191 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3192 rx->skb->data, rx->skb->len,
3193 ieee80211_rx_status_to_khz(status),
3195 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3198 if (ieee80211_drop_unencrypted_mgmt(rx))
3199 return RX_DROP_UNUSABLE;
3204 static ieee80211_rx_result debug_noinline
3205 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3207 struct ieee80211_local *local = rx->local;
3208 struct ieee80211_sub_if_data *sdata = rx->sdata;
3209 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3210 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3211 int len = rx->skb->len;
3213 if (!ieee80211_is_action(mgmt->frame_control))
3216 /* drop too small frames */
3217 if (len < IEEE80211_MIN_ACTION_SIZE)
3218 return RX_DROP_UNUSABLE;
3220 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3221 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3222 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3223 return RX_DROP_UNUSABLE;
3225 switch (mgmt->u.action.category) {
3226 case WLAN_CATEGORY_HT:
3227 /* reject HT action frames from stations not supporting HT */
3228 if (!rx->sta->sta.ht_cap.ht_supported)
3231 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3232 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3233 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3234 sdata->vif.type != NL80211_IFTYPE_AP &&
3235 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3238 /* verify action & smps_control/chanwidth are present */
3239 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3242 switch (mgmt->u.action.u.ht_smps.action) {
3243 case WLAN_HT_ACTION_SMPS: {
3244 struct ieee80211_supported_band *sband;
3245 enum ieee80211_smps_mode smps_mode;
3246 struct sta_opmode_info sta_opmode = {};
3248 if (sdata->vif.type != NL80211_IFTYPE_AP &&
3249 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3252 /* convert to HT capability */
3253 switch (mgmt->u.action.u.ht_smps.smps_control) {
3254 case WLAN_HT_SMPS_CONTROL_DISABLED:
3255 smps_mode = IEEE80211_SMPS_OFF;
3257 case WLAN_HT_SMPS_CONTROL_STATIC:
3258 smps_mode = IEEE80211_SMPS_STATIC;
3260 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3261 smps_mode = IEEE80211_SMPS_DYNAMIC;
3267 /* if no change do nothing */
3268 if (rx->sta->sta.smps_mode == smps_mode)
3270 rx->sta->sta.smps_mode = smps_mode;
3271 sta_opmode.smps_mode =
3272 ieee80211_smps_mode_to_smps_mode(smps_mode);
3273 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3275 sband = rx->local->hw.wiphy->bands[status->band];
3277 rate_control_rate_update(local, sband, rx->sta,
3278 IEEE80211_RC_SMPS_CHANGED);
3279 cfg80211_sta_opmode_change_notify(sdata->dev,
3285 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3286 struct ieee80211_supported_band *sband;
3287 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3288 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3289 struct sta_opmode_info sta_opmode = {};
3291 /* If it doesn't support 40 MHz it can't change ... */
3292 if (!(rx->sta->sta.ht_cap.cap &
3293 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3296 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3297 max_bw = IEEE80211_STA_RX_BW_20;
3299 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3301 /* set cur_max_bandwidth and recalc sta bw */
3302 rx->sta->cur_max_bandwidth = max_bw;
3303 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3305 if (rx->sta->sta.bandwidth == new_bw)
3308 rx->sta->sta.bandwidth = new_bw;
3309 sband = rx->local->hw.wiphy->bands[status->band];
3311 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3312 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3314 rate_control_rate_update(local, sband, rx->sta,
3315 IEEE80211_RC_BW_CHANGED);
3316 cfg80211_sta_opmode_change_notify(sdata->dev,
3327 case WLAN_CATEGORY_PUBLIC:
3328 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3330 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3334 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3336 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3337 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3339 if (len < offsetof(struct ieee80211_mgmt,
3340 u.action.u.ext_chan_switch.variable))
3343 case WLAN_CATEGORY_VHT:
3344 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3345 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3346 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3347 sdata->vif.type != NL80211_IFTYPE_AP &&
3348 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3351 /* verify action code is present */
3352 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3355 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3356 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3357 /* verify opmode is present */
3358 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3362 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3363 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3371 case WLAN_CATEGORY_BACK:
3372 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3373 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3374 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3375 sdata->vif.type != NL80211_IFTYPE_AP &&
3376 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3379 /* verify action_code is present */
3380 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3383 switch (mgmt->u.action.u.addba_req.action_code) {
3384 case WLAN_ACTION_ADDBA_REQ:
3385 if (len < (IEEE80211_MIN_ACTION_SIZE +
3386 sizeof(mgmt->u.action.u.addba_req)))
3389 case WLAN_ACTION_ADDBA_RESP:
3390 if (len < (IEEE80211_MIN_ACTION_SIZE +
3391 sizeof(mgmt->u.action.u.addba_resp)))
3394 case WLAN_ACTION_DELBA:
3395 if (len < (IEEE80211_MIN_ACTION_SIZE +
3396 sizeof(mgmt->u.action.u.delba)))
3404 case WLAN_CATEGORY_SPECTRUM_MGMT:
3405 /* verify action_code is present */
3406 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3409 switch (mgmt->u.action.u.measurement.action_code) {
3410 case WLAN_ACTION_SPCT_MSR_REQ:
3411 if (status->band != NL80211_BAND_5GHZ)
3414 if (len < (IEEE80211_MIN_ACTION_SIZE +
3415 sizeof(mgmt->u.action.u.measurement)))
3418 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3421 ieee80211_process_measurement_req(sdata, mgmt, len);
3423 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3425 if (len < (IEEE80211_MIN_ACTION_SIZE +
3426 sizeof(mgmt->u.action.u.chan_switch)))
3429 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3430 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3431 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3434 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3435 bssid = sdata->u.mgd.bssid;
3436 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3437 bssid = sdata->u.ibss.bssid;
3438 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3443 if (!ether_addr_equal(mgmt->bssid, bssid))
3450 case WLAN_CATEGORY_SELF_PROTECTED:
3451 if (len < (IEEE80211_MIN_ACTION_SIZE +
3452 sizeof(mgmt->u.action.u.self_prot.action_code)))
3455 switch (mgmt->u.action.u.self_prot.action_code) {
3456 case WLAN_SP_MESH_PEERING_OPEN:
3457 case WLAN_SP_MESH_PEERING_CLOSE:
3458 case WLAN_SP_MESH_PEERING_CONFIRM:
3459 if (!ieee80211_vif_is_mesh(&sdata->vif))
3461 if (sdata->u.mesh.user_mpm)
3462 /* userspace handles this frame */
3465 case WLAN_SP_MGK_INFORM:
3466 case WLAN_SP_MGK_ACK:
3467 if (!ieee80211_vif_is_mesh(&sdata->vif))
3472 case WLAN_CATEGORY_MESH_ACTION:
3473 if (len < (IEEE80211_MIN_ACTION_SIZE +
3474 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3477 if (!ieee80211_vif_is_mesh(&sdata->vif))
3479 if (mesh_action_is_path_sel(mgmt) &&
3480 !mesh_path_sel_is_hwmp(sdata))
3488 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3489 /* will return in the next handlers */
3494 rx->sta->rx_stats.packets++;
3495 dev_kfree_skb(rx->skb);
3499 skb_queue_tail(&sdata->skb_queue, rx->skb);
3500 ieee80211_queue_work(&local->hw, &sdata->work);
3502 rx->sta->rx_stats.packets++;
3506 static ieee80211_rx_result debug_noinline
3507 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3509 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3512 /* skip known-bad action frames and return them in the next handler */
3513 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3517 * Getting here means the kernel doesn't know how to handle
3518 * it, but maybe userspace does ... include returned frames
3519 * so userspace can register for those to know whether ones
3520 * it transmitted were processed or returned.
3523 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3524 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3525 sig = status->signal;
3527 if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev,
3528 ieee80211_rx_status_to_khz(status), sig,
3529 rx->skb->data, rx->skb->len, 0)) {
3531 rx->sta->rx_stats.packets++;
3532 dev_kfree_skb(rx->skb);
3539 static ieee80211_rx_result debug_noinline
3540 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3542 struct ieee80211_sub_if_data *sdata = rx->sdata;
3543 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3544 int len = rx->skb->len;
3546 if (!ieee80211_is_action(mgmt->frame_control))
3549 switch (mgmt->u.action.category) {
3550 case WLAN_CATEGORY_SA_QUERY:
3551 if (len < (IEEE80211_MIN_ACTION_SIZE +
3552 sizeof(mgmt->u.action.u.sa_query)))
3555 switch (mgmt->u.action.u.sa_query.action) {
3556 case WLAN_ACTION_SA_QUERY_REQUEST:
3557 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3559 ieee80211_process_sa_query_req(sdata, mgmt, len);
3569 rx->sta->rx_stats.packets++;
3570 dev_kfree_skb(rx->skb);
3574 static ieee80211_rx_result debug_noinline
3575 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3577 struct ieee80211_local *local = rx->local;
3578 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3579 struct sk_buff *nskb;
3580 struct ieee80211_sub_if_data *sdata = rx->sdata;
3581 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3583 if (!ieee80211_is_action(mgmt->frame_control))
3587 * For AP mode, hostapd is responsible for handling any action
3588 * frames that we didn't handle, including returning unknown
3589 * ones. For all other modes we will return them to the sender,
3590 * setting the 0x80 bit in the action category, as required by
3591 * 802.11-2012 9.24.4.
3592 * Newer versions of hostapd shall also use the management frame
3593 * registration mechanisms, but older ones still use cooked
3594 * monitor interfaces so push all frames there.
3596 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3597 (sdata->vif.type == NL80211_IFTYPE_AP ||
3598 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3599 return RX_DROP_MONITOR;
3601 if (is_multicast_ether_addr(mgmt->da))
3602 return RX_DROP_MONITOR;
3604 /* do not return rejected action frames */
3605 if (mgmt->u.action.category & 0x80)
3606 return RX_DROP_UNUSABLE;
3608 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3611 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3613 nmgmt->u.action.category |= 0x80;
3614 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3615 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3617 memset(nskb->cb, 0, sizeof(nskb->cb));
3619 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3620 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3622 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3623 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3624 IEEE80211_TX_CTL_NO_CCK_RATE;
3625 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3627 local->hw.offchannel_tx_hw_queue;
3630 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3633 dev_kfree_skb(rx->skb);
3637 static ieee80211_rx_result debug_noinline
3638 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3640 struct ieee80211_sub_if_data *sdata = rx->sdata;
3641 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3643 if (!ieee80211_is_ext(hdr->frame_control))
3646 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3647 return RX_DROP_MONITOR;
3649 /* for now only beacons are ext, so queue them */
3650 skb_queue_tail(&sdata->skb_queue, rx->skb);
3651 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3653 rx->sta->rx_stats.packets++;
3658 static ieee80211_rx_result debug_noinline
3659 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3661 struct ieee80211_sub_if_data *sdata = rx->sdata;
3662 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3665 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3667 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3668 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3669 sdata->vif.type != NL80211_IFTYPE_OCB &&
3670 sdata->vif.type != NL80211_IFTYPE_STATION)
3671 return RX_DROP_MONITOR;
3674 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3675 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3676 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3677 /* process for all: mesh, mlme, ibss */
3679 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3680 if (is_multicast_ether_addr(mgmt->da) &&
3681 !is_broadcast_ether_addr(mgmt->da))
3682 return RX_DROP_MONITOR;
3684 /* process only for station/IBSS */
3685 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3686 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3687 return RX_DROP_MONITOR;
3689 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3690 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3691 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3692 if (is_multicast_ether_addr(mgmt->da) &&
3693 !is_broadcast_ether_addr(mgmt->da))
3694 return RX_DROP_MONITOR;
3696 /* process only for station */
3697 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3698 return RX_DROP_MONITOR;
3700 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3701 /* process only for ibss and mesh */
3702 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3703 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3704 return RX_DROP_MONITOR;
3707 return RX_DROP_MONITOR;
3710 /* queue up frame and kick off work to process it */
3711 skb_queue_tail(&sdata->skb_queue, rx->skb);
3712 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3714 rx->sta->rx_stats.packets++;
3719 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3720 struct ieee80211_rate *rate)
3722 struct ieee80211_sub_if_data *sdata;
3723 struct ieee80211_local *local = rx->local;
3724 struct sk_buff *skb = rx->skb, *skb2;
3725 struct net_device *prev_dev = NULL;
3726 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3727 int needed_headroom;
3730 * If cooked monitor has been processed already, then
3731 * don't do it again. If not, set the flag.
3733 if (rx->flags & IEEE80211_RX_CMNTR)
3735 rx->flags |= IEEE80211_RX_CMNTR;
3737 /* If there are no cooked monitor interfaces, just free the SKB */
3738 if (!local->cooked_mntrs)
3741 /* vendor data is long removed here */
3742 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3743 /* room for the radiotap header based on driver features */
3744 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3746 if (skb_headroom(skb) < needed_headroom &&
3747 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3750 /* prepend radiotap information */
3751 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3754 skb_reset_mac_header(skb);
3755 skb->ip_summed = CHECKSUM_UNNECESSARY;
3756 skb->pkt_type = PACKET_OTHERHOST;
3757 skb->protocol = htons(ETH_P_802_2);
3759 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3760 if (!ieee80211_sdata_running(sdata))
3763 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3764 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3768 skb2 = skb_clone(skb, GFP_ATOMIC);
3770 skb2->dev = prev_dev;
3771 netif_receive_skb(skb2);
3775 prev_dev = sdata->dev;
3776 dev_sw_netstats_rx_add(sdata->dev, skb->len);
3780 skb->dev = prev_dev;
3781 netif_receive_skb(skb);
3789 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3790 ieee80211_rx_result res)
3793 case RX_DROP_MONITOR:
3794 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3796 rx->sta->rx_stats.dropped++;
3799 struct ieee80211_rate *rate = NULL;
3800 struct ieee80211_supported_band *sband;
3801 struct ieee80211_rx_status *status;
3803 status = IEEE80211_SKB_RXCB((rx->skb));
3805 sband = rx->local->hw.wiphy->bands[status->band];
3806 if (status->encoding == RX_ENC_LEGACY)
3807 rate = &sband->bitrates[status->rate_idx];
3809 ieee80211_rx_cooked_monitor(rx, rate);
3812 case RX_DROP_UNUSABLE:
3813 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3815 rx->sta->rx_stats.dropped++;
3816 dev_kfree_skb(rx->skb);
3819 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3824 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3825 struct sk_buff_head *frames)
3827 ieee80211_rx_result res = RX_DROP_MONITOR;
3828 struct sk_buff *skb;
3830 #define CALL_RXH(rxh) \
3833 if (res != RX_CONTINUE) \
3837 /* Lock here to avoid hitting all of the data used in the RX
3838 * path (e.g. key data, station data, ...) concurrently when
3839 * a frame is released from the reorder buffer due to timeout
3840 * from the timer, potentially concurrently with RX from the
3843 spin_lock_bh(&rx->local->rx_path_lock);
3845 while ((skb = __skb_dequeue(frames))) {
3847 * all the other fields are valid across frames
3848 * that belong to an aMPDU since they are on the
3849 * same TID from the same station
3853 CALL_RXH(ieee80211_rx_h_check_more_data);
3854 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3855 CALL_RXH(ieee80211_rx_h_sta_process);
3856 CALL_RXH(ieee80211_rx_h_decrypt);
3857 CALL_RXH(ieee80211_rx_h_defragment);
3858 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3859 /* must be after MMIC verify so header is counted in MPDU mic */
3860 #ifdef CONFIG_MAC80211_MESH
3861 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3862 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3864 CALL_RXH(ieee80211_rx_h_amsdu);
3865 CALL_RXH(ieee80211_rx_h_data);
3867 /* special treatment -- needs the queue */
3868 res = ieee80211_rx_h_ctrl(rx, frames);
3869 if (res != RX_CONTINUE)
3872 CALL_RXH(ieee80211_rx_h_mgmt_check);
3873 CALL_RXH(ieee80211_rx_h_action);
3874 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3875 CALL_RXH(ieee80211_rx_h_action_post_userspace);
3876 CALL_RXH(ieee80211_rx_h_action_return);
3877 CALL_RXH(ieee80211_rx_h_ext);
3878 CALL_RXH(ieee80211_rx_h_mgmt);
3881 ieee80211_rx_handlers_result(rx, res);
3886 spin_unlock_bh(&rx->local->rx_path_lock);
3889 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3891 struct sk_buff_head reorder_release;
3892 ieee80211_rx_result res = RX_DROP_MONITOR;
3894 __skb_queue_head_init(&reorder_release);
3896 #define CALL_RXH(rxh) \
3899 if (res != RX_CONTINUE) \
3903 CALL_RXH(ieee80211_rx_h_check_dup);
3904 CALL_RXH(ieee80211_rx_h_check);
3906 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3908 ieee80211_rx_handlers(rx, &reorder_release);
3912 ieee80211_rx_handlers_result(rx, res);
3918 * This function makes calls into the RX path, therefore
3919 * it has to be invoked under RCU read lock.
3921 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3923 struct sk_buff_head frames;
3924 struct ieee80211_rx_data rx = {
3926 .sdata = sta->sdata,
3927 .local = sta->local,
3928 /* This is OK -- must be QoS data frame */
3929 .security_idx = tid,
3932 struct tid_ampdu_rx *tid_agg_rx;
3934 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3938 __skb_queue_head_init(&frames);
3940 spin_lock(&tid_agg_rx->reorder_lock);
3941 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3942 spin_unlock(&tid_agg_rx->reorder_lock);
3944 if (!skb_queue_empty(&frames)) {
3945 struct ieee80211_event event = {
3946 .type = BA_FRAME_TIMEOUT,
3948 .u.ba.sta = &sta->sta,
3950 drv_event_callback(rx.local, rx.sdata, &event);
3953 ieee80211_rx_handlers(&rx, &frames);
3956 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3957 u16 ssn, u64 filtered,
3960 struct sta_info *sta;
3961 struct tid_ampdu_rx *tid_agg_rx;
3962 struct sk_buff_head frames;
3963 struct ieee80211_rx_data rx = {
3964 /* This is OK -- must be QoS data frame */
3965 .security_idx = tid,
3970 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3973 __skb_queue_head_init(&frames);
3975 sta = container_of(pubsta, struct sta_info, sta);
3978 rx.sdata = sta->sdata;
3979 rx.local = sta->local;
3982 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3986 spin_lock_bh(&tid_agg_rx->reorder_lock);
3988 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3991 /* release all frames in the reorder buffer */
3992 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3993 IEEE80211_SN_MODULO;
3994 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3996 /* update ssn to match received ssn */
3997 tid_agg_rx->head_seq_num = ssn;
3999 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4003 /* handle the case that received ssn is behind the mac ssn.
4004 * it can be tid_agg_rx->buf_size behind and still be valid */
4005 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4006 if (diff >= tid_agg_rx->buf_size) {
4007 tid_agg_rx->reorder_buf_filtered = 0;
4010 filtered = filtered >> diff;
4014 for (i = 0; i < tid_agg_rx->buf_size; i++) {
4015 int index = (ssn + i) % tid_agg_rx->buf_size;
4017 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4018 if (filtered & BIT_ULL(i))
4019 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4022 /* now process also frames that the filter marking released */
4023 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4026 spin_unlock_bh(&tid_agg_rx->reorder_lock);
4028 ieee80211_rx_handlers(&rx, &frames);
4033 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4035 /* main receive path */
4037 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4039 struct ieee80211_sub_if_data *sdata = rx->sdata;
4040 struct sk_buff *skb = rx->skb;
4041 struct ieee80211_hdr *hdr = (void *)skb->data;
4042 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4043 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4044 bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4045 ieee80211_is_s1g_beacon(hdr->frame_control);
4047 switch (sdata->vif.type) {
4048 case NL80211_IFTYPE_STATION:
4049 if (!bssid && !sdata->u.mgd.use_4addr)
4051 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4055 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4056 case NL80211_IFTYPE_ADHOC:
4059 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4060 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
4062 if (ieee80211_is_beacon(hdr->frame_control))
4064 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4067 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4071 if (status->encoding != RX_ENC_LEGACY)
4072 rate_idx = 0; /* TODO: HT/VHT rates */
4074 rate_idx = status->rate_idx;
4075 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4079 case NL80211_IFTYPE_OCB:
4082 if (!ieee80211_is_data_present(hdr->frame_control))
4084 if (!is_broadcast_ether_addr(bssid))
4087 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4091 if (status->encoding != RX_ENC_LEGACY)
4092 rate_idx = 0; /* TODO: HT rates */
4094 rate_idx = status->rate_idx;
4095 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4099 case NL80211_IFTYPE_MESH_POINT:
4100 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4104 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4105 case NL80211_IFTYPE_AP_VLAN:
4106 case NL80211_IFTYPE_AP:
4108 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4110 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
4112 * Accept public action frames even when the
4113 * BSSID doesn't match, this is used for P2P
4114 * and location updates. Note that mac80211
4115 * itself never looks at these frames.
4118 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4120 if (ieee80211_is_public_action(hdr, skb->len))
4122 return ieee80211_is_beacon(hdr->frame_control);
4125 if (!ieee80211_has_tods(hdr->frame_control)) {
4126 /* ignore data frames to TDLS-peers */
4127 if (ieee80211_is_data(hdr->frame_control))
4129 /* ignore action frames to TDLS-peers */
4130 if (ieee80211_is_action(hdr->frame_control) &&
4131 !is_broadcast_ether_addr(bssid) &&
4132 !ether_addr_equal(bssid, hdr->addr1))
4137 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4138 * the BSSID - we've checked that already but may have accepted
4139 * the wildcard (ff:ff:ff:ff:ff:ff).
4142 * The BSSID of the Data frame is determined as follows:
4143 * a) If the STA is contained within an AP or is associated
4144 * with an AP, the BSSID is the address currently in use
4145 * by the STA contained in the AP.
4147 * So we should not accept data frames with an address that's
4150 * Accepting it also opens a security problem because stations
4151 * could encrypt it with the GTK and inject traffic that way.
4153 if (ieee80211_is_data(hdr->frame_control) && multicast)
4157 case NL80211_IFTYPE_P2P_DEVICE:
4158 return ieee80211_is_public_action(hdr, skb->len) ||
4159 ieee80211_is_probe_req(hdr->frame_control) ||
4160 ieee80211_is_probe_resp(hdr->frame_control) ||
4161 ieee80211_is_beacon(hdr->frame_control);
4162 case NL80211_IFTYPE_NAN:
4163 /* Currently no frames on NAN interface are allowed */
4173 void ieee80211_check_fast_rx(struct sta_info *sta)
4175 struct ieee80211_sub_if_data *sdata = sta->sdata;
4176 struct ieee80211_local *local = sdata->local;
4177 struct ieee80211_key *key;
4178 struct ieee80211_fast_rx fastrx = {
4180 .vif_type = sdata->vif.type,
4181 .control_port_protocol = sdata->control_port_protocol,
4182 }, *old, *new = NULL;
4183 bool set_offload = false;
4184 bool assign = false;
4187 /* use sparse to check that we don't return without updating */
4188 __acquire(check_fast_rx);
4190 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4191 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4192 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4193 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4195 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4197 /* fast-rx doesn't do reordering */
4198 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4199 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4202 switch (sdata->vif.type) {
4203 case NL80211_IFTYPE_STATION:
4204 if (sta->sta.tdls) {
4205 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4206 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4207 fastrx.expected_ds_bits = 0;
4209 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4210 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4211 fastrx.expected_ds_bits =
4212 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4215 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4216 fastrx.expected_ds_bits |=
4217 cpu_to_le16(IEEE80211_FCTL_TODS);
4218 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4219 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4222 if (!sdata->u.mgd.powersave)
4225 /* software powersave is a huge mess, avoid all of it */
4226 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4228 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4229 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4232 case NL80211_IFTYPE_AP_VLAN:
4233 case NL80211_IFTYPE_AP:
4234 /* parallel-rx requires this, at least with calls to
4235 * ieee80211_sta_ps_transition()
4237 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4239 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4240 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4241 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4243 fastrx.internal_forward =
4244 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4245 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4246 !sdata->u.vlan.sta);
4248 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4249 sdata->u.vlan.sta) {
4250 fastrx.expected_ds_bits |=
4251 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4252 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4253 fastrx.internal_forward = 0;
4261 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4265 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4267 key = rcu_dereference(sdata->default_unicast_key);
4269 switch (key->conf.cipher) {
4270 case WLAN_CIPHER_SUITE_TKIP:
4271 /* we don't want to deal with MMIC in fast-rx */
4273 case WLAN_CIPHER_SUITE_CCMP:
4274 case WLAN_CIPHER_SUITE_CCMP_256:
4275 case WLAN_CIPHER_SUITE_GCMP:
4276 case WLAN_CIPHER_SUITE_GCMP_256:
4279 /* We also don't want to deal with
4280 * WEP or cipher scheme.
4286 fastrx.icv_len = key->conf.icv_len;
4293 __release(check_fast_rx);
4296 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4299 (sdata->vif.offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED);
4302 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4304 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4307 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4309 spin_lock_bh(&sta->lock);
4310 old = rcu_dereference_protected(sta->fast_rx, true);
4311 rcu_assign_pointer(sta->fast_rx, new);
4312 spin_unlock_bh(&sta->lock);
4315 kfree_rcu(old, rcu_head);
4318 void ieee80211_clear_fast_rx(struct sta_info *sta)
4320 struct ieee80211_fast_rx *old;
4322 spin_lock_bh(&sta->lock);
4323 old = rcu_dereference_protected(sta->fast_rx, true);
4324 RCU_INIT_POINTER(sta->fast_rx, NULL);
4325 spin_unlock_bh(&sta->lock);
4328 kfree_rcu(old, rcu_head);
4331 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4333 struct ieee80211_local *local = sdata->local;
4334 struct sta_info *sta;
4336 lockdep_assert_held(&local->sta_mtx);
4338 list_for_each_entry(sta, &local->sta_list, list) {
4339 if (sdata != sta->sdata &&
4340 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4342 ieee80211_check_fast_rx(sta);
4346 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4348 struct ieee80211_local *local = sdata->local;
4350 mutex_lock(&local->sta_mtx);
4351 __ieee80211_check_fast_rx_iface(sdata);
4352 mutex_unlock(&local->sta_mtx);
4355 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4356 struct ieee80211_fast_rx *fast_rx,
4359 struct ieee80211_sta_rx_stats *stats;
4360 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4361 struct sta_info *sta = rx->sta;
4362 struct sk_buff *skb = rx->skb;
4363 void *sa = skb->data + ETH_ALEN;
4364 void *da = skb->data;
4366 stats = &sta->rx_stats;
4367 if (fast_rx->uses_rss)
4368 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4370 /* statistics part of ieee80211_rx_h_sta_process() */
4371 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4372 stats->last_signal = status->signal;
4373 if (!fast_rx->uses_rss)
4374 ewma_signal_add(&sta->rx_stats_avg.signal,
4378 if (status->chains) {
4381 stats->chains = status->chains;
4382 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4383 int signal = status->chain_signal[i];
4385 if (!(status->chains & BIT(i)))
4388 stats->chain_signal_last[i] = signal;
4389 if (!fast_rx->uses_rss)
4390 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4394 /* end of statistics */
4396 stats->last_rx = jiffies;
4397 stats->last_rate = sta_stats_encode_rate(status);
4402 skb->dev = fast_rx->dev;
4404 dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4406 /* The seqno index has the same property as needed
4407 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4408 * for non-QoS-data frames. Here we know it's a data
4409 * frame, so count MSDUs.
4411 u64_stats_update_begin(&stats->syncp);
4412 stats->msdu[rx->seqno_idx]++;
4413 stats->bytes += orig_len;
4414 u64_stats_update_end(&stats->syncp);
4416 if (fast_rx->internal_forward) {
4417 struct sk_buff *xmit_skb = NULL;
4418 if (is_multicast_ether_addr(da)) {
4419 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4420 } else if (!ether_addr_equal(da, sa) &&
4421 sta_info_get(rx->sdata, da)) {
4428 * Send to wireless media and increase priority by 256
4429 * to keep the received priority instead of
4430 * reclassifying the frame (see cfg80211_classify8021d).
4432 xmit_skb->priority += 256;
4433 xmit_skb->protocol = htons(ETH_P_802_3);
4434 skb_reset_network_header(xmit_skb);
4435 skb_reset_mac_header(xmit_skb);
4436 dev_queue_xmit(xmit_skb);
4443 /* deliver to local stack */
4444 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4445 memset(skb->cb, 0, sizeof(skb->cb));
4447 list_add_tail(&skb->list, rx->list);
4449 netif_receive_skb(skb);
4453 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4454 struct ieee80211_fast_rx *fast_rx)
4456 struct sk_buff *skb = rx->skb;
4457 struct ieee80211_hdr *hdr = (void *)skb->data;
4458 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4459 struct sta_info *sta = rx->sta;
4460 int orig_len = skb->len;
4461 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4462 int snap_offs = hdrlen;
4464 u8 snap[sizeof(rfc1042_header)];
4466 } *payload __aligned(2);
4470 } addrs __aligned(2);
4471 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4473 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4474 * to a common data structure; drivers can implement that per queue
4475 * but we don't have that information in mac80211
4477 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4480 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4482 /* If using encryption, we also need to have:
4483 * - PN_VALIDATED: similar, but the implementation is tricky
4484 * - DECRYPTED: necessary for PN_VALIDATED
4487 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4490 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4493 if (unlikely(ieee80211_is_frag(hdr)))
4496 /* Since our interface address cannot be multicast, this
4497 * implicitly also rejects multicast frames without the
4500 * We shouldn't get any *data* frames not addressed to us
4501 * (AP mode will accept multicast *management* frames), but
4502 * punting here will make it go through the full checks in
4503 * ieee80211_accept_frame().
4505 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4508 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4509 IEEE80211_FCTL_TODS)) !=
4510 fast_rx->expected_ds_bits)
4513 /* assign the key to drop unencrypted frames (later)
4514 * and strip the IV/MIC if necessary
4516 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4517 /* GCMP header length is the same */
4518 snap_offs += IEEE80211_CCMP_HDR_LEN;
4521 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4522 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4525 payload = (void *)(skb->data + snap_offs);
4527 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4530 /* Don't handle these here since they require special code.
4531 * Accept AARP and IPX even though they should come with a
4532 * bridge-tunnel header - but if we get them this way then
4533 * there's little point in discarding them.
4535 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4536 payload->proto == fast_rx->control_port_protocol))
4540 /* after this point, don't punt to the slowpath! */
4542 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4543 pskb_trim(skb, skb->len - fast_rx->icv_len))
4546 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4549 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4550 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4557 /* do the header conversion - first grab the addresses */
4558 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4559 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4560 /* remove the SNAP but leave the ethertype */
4561 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4562 /* push the addresses in front */
4563 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4565 ieee80211_rx_8023(rx, fast_rx, orig_len);
4570 if (fast_rx->uses_rss)
4571 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4578 * This function returns whether or not the SKB
4579 * was destined for RX processing or not, which,
4580 * if consume is true, is equivalent to whether
4581 * or not the skb was consumed.
4583 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4584 struct sk_buff *skb, bool consume)
4586 struct ieee80211_local *local = rx->local;
4587 struct ieee80211_sub_if_data *sdata = rx->sdata;
4591 /* See if we can do fast-rx; if we have to copy we already lost,
4592 * so punt in that case. We should never have to deliver a data
4593 * frame to multiple interfaces anyway.
4595 * We skip the ieee80211_accept_frame() call and do the necessary
4596 * checking inside ieee80211_invoke_fast_rx().
4598 if (consume && rx->sta) {
4599 struct ieee80211_fast_rx *fast_rx;
4601 fast_rx = rcu_dereference(rx->sta->fast_rx);
4602 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4606 if (!ieee80211_accept_frame(rx))
4610 skb = skb_copy(skb, GFP_ATOMIC);
4612 if (net_ratelimit())
4613 wiphy_debug(local->hw.wiphy,
4614 "failed to copy skb for %s\n",
4622 ieee80211_invoke_rx_handlers(rx);
4626 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
4627 struct ieee80211_sta *pubsta,
4628 struct sk_buff *skb,
4629 struct list_head *list)
4631 struct ieee80211_local *local = hw_to_local(hw);
4632 struct ieee80211_fast_rx *fast_rx;
4633 struct ieee80211_rx_data rx;
4635 memset(&rx, 0, sizeof(rx));
4640 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4642 /* drop frame if too short for header */
4643 if (skb->len < sizeof(struct ethhdr))
4649 rx.sta = container_of(pubsta, struct sta_info, sta);
4650 rx.sdata = rx.sta->sdata;
4652 fast_rx = rcu_dereference(rx.sta->fast_rx);
4656 ieee80211_rx_8023(&rx, fast_rx, skb->len);
4664 * This is the actual Rx frames handler. as it belongs to Rx path it must
4665 * be called with rcu_read_lock protection.
4667 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4668 struct ieee80211_sta *pubsta,
4669 struct sk_buff *skb,
4670 struct list_head *list)
4672 struct ieee80211_local *local = hw_to_local(hw);
4673 struct ieee80211_sub_if_data *sdata;
4674 struct ieee80211_hdr *hdr;
4676 struct ieee80211_rx_data rx;
4677 struct ieee80211_sub_if_data *prev;
4678 struct rhlist_head *tmp;
4681 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4682 memset(&rx, 0, sizeof(rx));
4687 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4688 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4690 if (ieee80211_is_mgmt(fc)) {
4691 /* drop frame if too short for header */
4692 if (skb->len < ieee80211_hdrlen(fc))
4695 err = skb_linearize(skb);
4697 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4705 hdr = (struct ieee80211_hdr *)skb->data;
4706 ieee80211_parse_qos(&rx);
4707 ieee80211_verify_alignment(&rx);
4709 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4710 ieee80211_is_beacon(hdr->frame_control) ||
4711 ieee80211_is_s1g_beacon(hdr->frame_control)))
4712 ieee80211_scan_rx(local, skb);
4714 if (ieee80211_is_data(fc)) {
4715 struct sta_info *sta, *prev_sta;
4718 rx.sta = container_of(pubsta, struct sta_info, sta);
4719 rx.sdata = rx.sta->sdata;
4720 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4727 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4734 rx.sdata = prev_sta->sdata;
4735 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4742 rx.sdata = prev_sta->sdata;
4744 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4752 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4753 if (!ieee80211_sdata_running(sdata))
4756 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4757 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4761 * frame is destined for this interface, but if it's
4762 * not also for the previous one we handle that after
4763 * the loop to avoid copying the SKB once too much
4771 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4773 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4779 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4782 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4791 * This is the receive path handler. It is called by a low level driver when an
4792 * 802.11 MPDU is received from the hardware.
4794 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4795 struct sk_buff *skb, struct list_head *list)
4797 struct ieee80211_local *local = hw_to_local(hw);
4798 struct ieee80211_rate *rate = NULL;
4799 struct ieee80211_supported_band *sband;
4800 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4802 WARN_ON_ONCE(softirq_count() == 0);
4804 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4807 sband = local->hw.wiphy->bands[status->band];
4808 if (WARN_ON(!sband))
4812 * If we're suspending, it is possible although not too likely
4813 * that we'd be receiving frames after having already partially
4814 * quiesced the stack. We can't process such frames then since
4815 * that might, for example, cause stations to be added or other
4816 * driver callbacks be invoked.
4818 if (unlikely(local->quiescing || local->suspended))
4821 /* We might be during a HW reconfig, prevent Rx for the same reason */
4822 if (unlikely(local->in_reconfig))
4826 * The same happens when we're not even started,
4827 * but that's worth a warning.
4829 if (WARN_ON(!local->started))
4832 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4834 * Validate the rate, unless a PLCP error means that
4835 * we probably can't have a valid rate here anyway.
4838 switch (status->encoding) {
4841 * rate_idx is MCS index, which can be [0-76]
4844 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
4846 * Anything else would be some sort of driver or
4847 * hardware error. The driver should catch hardware
4850 if (WARN(status->rate_idx > 76,
4851 "Rate marked as an HT rate but passed "
4852 "status->rate_idx is not "
4853 "an MCS index [0-76]: %d (0x%02x)\n",
4859 if (WARN_ONCE(status->rate_idx > 9 ||
4862 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4863 status->rate_idx, status->nss))
4867 if (WARN_ONCE(status->rate_idx > 11 ||
4870 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4871 status->rate_idx, status->nss))
4878 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4880 rate = &sband->bitrates[status->rate_idx];
4884 status->rx_flags = 0;
4886 kcov_remote_start_common(skb_get_kcov_handle(skb));
4889 * Frames with failed FCS/PLCP checksum are not returned,
4890 * all other frames are returned without radiotap header
4891 * if it was previously present.
4892 * Also, frames with less than 16 bytes are dropped.
4894 if (!(status->flag & RX_FLAG_8023))
4895 skb = ieee80211_rx_monitor(local, skb, rate);
4897 ieee80211_tpt_led_trig_rx(local,
4898 ((struct ieee80211_hdr *)skb->data)->frame_control,
4901 if (status->flag & RX_FLAG_8023)
4902 __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
4904 __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
4912 EXPORT_SYMBOL(ieee80211_rx_list);
4914 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4915 struct sk_buff *skb, struct napi_struct *napi)
4917 struct sk_buff *tmp;
4922 * key references and virtual interfaces are protected using RCU
4923 * and this requires that we are in a read-side RCU section during
4924 * receive processing
4927 ieee80211_rx_list(hw, pubsta, skb, &list);
4931 netif_receive_skb_list(&list);
4935 list_for_each_entry_safe(skb, tmp, &list, list) {
4936 skb_list_del_init(skb);
4937 napi_gro_receive(napi, skb);
4940 EXPORT_SYMBOL(ieee80211_rx_napi);
4942 /* This is a version of the rx handler that can be called from hard irq
4943 * context. Post the skb on the queue and schedule the tasklet */
4944 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4946 struct ieee80211_local *local = hw_to_local(hw);
4948 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4950 skb->pkt_type = IEEE80211_RX_MSG;
4951 skb_queue_tail(&local->skb_queue, skb);
4952 tasklet_schedule(&local->tasklet);
4954 EXPORT_SYMBOL(ieee80211_rx_irqsafe);