2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
8 * Copyright (C) 2018 Intel Corporation
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/jiffies.h>
16 #include <linux/slab.h>
17 #include <linux/kernel.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <linux/bitops.h>
24 #include <net/mac80211.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
40 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
42 u64_stats_update_begin(&tstats->syncp);
44 tstats->rx_bytes += len;
45 u64_stats_update_end(&tstats->syncp);
48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49 enum nl80211_iftype type)
51 __le16 fc = hdr->frame_control;
53 if (ieee80211_is_data(fc)) {
54 if (len < 24) /* drop incorrect hdr len (data) */
57 if (ieee80211_has_a4(fc))
59 if (ieee80211_has_tods(fc))
61 if (ieee80211_has_fromds(fc))
67 if (ieee80211_is_mgmt(fc)) {
68 if (len < 24) /* drop incorrect hdr len (mgmt) */
73 if (ieee80211_is_ctl(fc)) {
74 if (ieee80211_is_pspoll(fc))
77 if (ieee80211_is_back_req(fc)) {
79 case NL80211_IFTYPE_STATION:
81 case NL80211_IFTYPE_AP:
82 case NL80211_IFTYPE_AP_VLAN:
85 break; /* fall through to the return */
94 * monitor mode reception
96 * This function cleans up the SKB, i.e. it removes all the stuff
97 * only useful for monitoring.
99 static void remove_monitor_info(struct sk_buff *skb,
100 unsigned int present_fcs_len,
101 unsigned int rtap_space)
104 __pskb_trim(skb, skb->len - present_fcs_len);
105 __pskb_pull(skb, rtap_space);
108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
109 unsigned int rtap_space)
111 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
112 struct ieee80211_hdr *hdr;
114 hdr = (void *)(skb->data + rtap_space);
116 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
117 RX_FLAG_FAILED_PLCP_CRC |
118 RX_FLAG_ONLY_MONITOR |
122 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
125 if (ieee80211_is_ctl(hdr->frame_control) &&
126 !ieee80211_is_pspoll(hdr->frame_control) &&
127 !ieee80211_is_back_req(hdr->frame_control))
134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
135 struct ieee80211_rx_status *status,
140 /* always present fields */
141 len = sizeof(struct ieee80211_radiotap_header) + 8;
143 /* allocate extra bitmaps */
145 len += 4 * hweight8(status->chains);
147 if (ieee80211_have_rx_timestamp(status)) {
151 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
154 /* antenna field, if we don't have per-chain info */
158 /* padding for RX_FLAGS if necessary */
161 if (status->encoding == RX_ENC_HT) /* HT info */
164 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
169 if (status->encoding == RX_ENC_VHT) {
174 if (local->hw.radiotap_timestamp.units_pos >= 0) {
179 if (status->encoding == RX_ENC_HE &&
180 status->flag & RX_FLAG_RADIOTAP_HE) {
183 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
186 if (status->encoding == RX_ENC_HE &&
187 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
190 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
193 if (status->flag & RX_FLAG_NO_PSDU)
196 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
199 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
202 if (status->chains) {
203 /* antenna and antenna signal fields */
204 len += 2 * hweight8(status->chains);
207 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
208 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
210 /* vendor presence bitmap */
212 /* alignment for fixed 6-byte vendor data header */
214 /* vendor data header */
216 if (WARN_ON(rtap->align == 0))
218 len = ALIGN(len, rtap->align);
219 len += rtap->len + rtap->pad;
225 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
230 struct ieee80211_hdr_3addr hdr;
238 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
240 if (skb->len < rtap_space + sizeof(action) +
241 VHT_MUMIMO_GROUPS_DATA_LEN)
244 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
247 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
249 if (!ieee80211_is_action(action.hdr.frame_control))
252 if (action.category != WLAN_CATEGORY_VHT)
255 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
258 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
261 skb = skb_copy(skb, GFP_ATOMIC);
265 skb_queue_tail(&sdata->skb_queue, skb);
266 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
270 * ieee80211_add_rx_radiotap_header - add radiotap header
272 * add a radiotap header containing all the fields which the hardware provided.
275 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
277 struct ieee80211_rate *rate,
278 int rtap_len, bool has_fcs)
280 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
281 struct ieee80211_radiotap_header *rthdr;
286 u16 channel_flags = 0;
288 unsigned long chains = status->chains;
289 struct ieee80211_vendor_radiotap rtap = {};
290 struct ieee80211_radiotap_he he = {};
291 struct ieee80211_radiotap_he_mu he_mu = {};
292 struct ieee80211_radiotap_lsig lsig = {};
294 if (status->flag & RX_FLAG_RADIOTAP_HE) {
295 he = *(struct ieee80211_radiotap_he *)skb->data;
296 skb_pull(skb, sizeof(he));
297 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
300 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
301 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
302 skb_pull(skb, sizeof(he_mu));
305 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
306 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
307 skb_pull(skb, sizeof(lsig));
310 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
311 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
312 /* rtap.len and rtap.pad are undone immediately */
313 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
317 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
320 rthdr = skb_push(skb, rtap_len);
321 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
322 it_present = &rthdr->it_present;
324 /* radiotap header, set always present flags */
325 rthdr->it_len = cpu_to_le16(rtap_len);
326 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
327 BIT(IEEE80211_RADIOTAP_CHANNEL) |
328 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
331 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
333 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
335 BIT(IEEE80211_RADIOTAP_EXT) |
336 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
337 put_unaligned_le32(it_present_val, it_present);
339 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
340 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
343 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
344 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
345 BIT(IEEE80211_RADIOTAP_EXT);
346 put_unaligned_le32(it_present_val, it_present);
348 it_present_val = rtap.present;
351 put_unaligned_le32(it_present_val, it_present);
353 pos = (void *)(it_present + 1);
355 /* the order of the following fields is important */
357 /* IEEE80211_RADIOTAP_TSFT */
358 if (ieee80211_have_rx_timestamp(status)) {
360 while ((pos - (u8 *)rthdr) & 7)
363 ieee80211_calculate_rx_timestamp(local, status,
366 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
370 /* IEEE80211_RADIOTAP_FLAGS */
371 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
372 *pos |= IEEE80211_RADIOTAP_F_FCS;
373 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
374 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
375 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
376 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
379 /* IEEE80211_RADIOTAP_RATE */
380 if (!rate || status->encoding != RX_ENC_LEGACY) {
382 * Without rate information don't add it. If we have,
383 * MCS information is a separate field in radiotap,
384 * added below. The byte here is needed as padding
385 * for the channel though, so initialise it to 0.
390 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
391 if (status->bw == RATE_INFO_BW_10)
393 else if (status->bw == RATE_INFO_BW_5)
395 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
399 /* IEEE80211_RADIOTAP_CHANNEL */
400 put_unaligned_le16(status->freq, pos);
402 if (status->bw == RATE_INFO_BW_10)
403 channel_flags |= IEEE80211_CHAN_HALF;
404 else if (status->bw == RATE_INFO_BW_5)
405 channel_flags |= IEEE80211_CHAN_QUARTER;
407 if (status->band == NL80211_BAND_5GHZ)
408 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
409 else if (status->encoding != RX_ENC_LEGACY)
410 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
411 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
412 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
414 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
416 channel_flags |= IEEE80211_CHAN_2GHZ;
417 put_unaligned_le16(channel_flags, pos);
420 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
421 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
422 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
423 *pos = status->signal;
425 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
429 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
431 if (!status->chains) {
432 /* IEEE80211_RADIOTAP_ANTENNA */
433 *pos = status->antenna;
437 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
439 /* IEEE80211_RADIOTAP_RX_FLAGS */
440 /* ensure 2 byte alignment for the 2 byte field as required */
441 if ((pos - (u8 *)rthdr) & 1)
443 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
444 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
445 put_unaligned_le16(rx_flags, pos);
448 if (status->encoding == RX_ENC_HT) {
451 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
452 *pos++ = local->hw.radiotap_mcs_details;
454 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
455 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
456 if (status->bw == RATE_INFO_BW_40)
457 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
458 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
459 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
460 if (status->enc_flags & RX_ENC_FLAG_LDPC)
461 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
462 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
463 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
465 *pos++ = status->rate_idx;
468 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
471 /* ensure 4 byte alignment */
472 while ((pos - (u8 *)rthdr) & 3)
475 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
476 put_unaligned_le32(status->ampdu_reference, pos);
478 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
479 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
480 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
481 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
482 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
483 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
484 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
485 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
486 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
487 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
488 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
489 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
490 put_unaligned_le16(flags, pos);
492 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
493 *pos++ = status->ampdu_delimiter_crc;
499 if (status->encoding == RX_ENC_VHT) {
500 u16 known = local->hw.radiotap_vht_details;
502 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
503 put_unaligned_le16(known, pos);
506 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
507 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
508 /* in VHT, STBC is binary */
509 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
510 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
511 if (status->enc_flags & RX_ENC_FLAG_BF)
512 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
515 switch (status->bw) {
516 case RATE_INFO_BW_80:
519 case RATE_INFO_BW_160:
522 case RATE_INFO_BW_40:
529 *pos = (status->rate_idx << 4) | status->nss;
532 if (status->enc_flags & RX_ENC_FLAG_LDPC)
533 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
541 if (local->hw.radiotap_timestamp.units_pos >= 0) {
543 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
546 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
548 /* ensure 8 byte alignment */
549 while ((pos - (u8 *)rthdr) & 7)
552 put_unaligned_le64(status->device_timestamp, pos);
555 if (local->hw.radiotap_timestamp.accuracy >= 0) {
556 accuracy = local->hw.radiotap_timestamp.accuracy;
557 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
559 put_unaligned_le16(accuracy, pos);
562 *pos++ = local->hw.radiotap_timestamp.units_pos;
566 if (status->encoding == RX_ENC_HE &&
567 status->flag & RX_FLAG_RADIOTAP_HE) {
568 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
570 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
571 he.data6 |= HE_PREP(DATA6_NSTS,
572 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
574 he.data3 |= HE_PREP(DATA3_STBC, 1);
576 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
579 #define CHECK_GI(s) \
580 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
581 (int)NL80211_RATE_INFO_HE_GI_##s)
587 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
588 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
589 he.data3 |= HE_PREP(DATA3_CODING,
590 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
592 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
594 switch (status->bw) {
595 case RATE_INFO_BW_20:
596 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
597 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
599 case RATE_INFO_BW_40:
600 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
601 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
603 case RATE_INFO_BW_80:
604 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
605 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
607 case RATE_INFO_BW_160:
608 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
609 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
611 case RATE_INFO_BW_HE_RU:
612 #define CHECK_RU_ALLOC(s) \
613 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
614 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
622 CHECK_RU_ALLOC(2x996);
624 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
628 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
631 /* ensure 2 byte alignment */
632 while ((pos - (u8 *)rthdr) & 1)
634 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
635 memcpy(pos, &he, sizeof(he));
639 if (status->encoding == RX_ENC_HE &&
640 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
641 /* ensure 2 byte alignment */
642 while ((pos - (u8 *)rthdr) & 1)
644 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
645 memcpy(pos, &he_mu, sizeof(he_mu));
646 pos += sizeof(he_mu);
649 if (status->flag & RX_FLAG_NO_PSDU) {
651 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
652 *pos++ = status->zero_length_psdu_type;
655 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
656 /* ensure 2 byte alignment */
657 while ((pos - (u8 *)rthdr) & 1)
659 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
660 memcpy(pos, &lsig, sizeof(lsig));
664 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
665 *pos++ = status->chain_signal[chain];
669 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
670 /* ensure 2 byte alignment for the vendor field as required */
671 if ((pos - (u8 *)rthdr) & 1)
673 *pos++ = rtap.oui[0];
674 *pos++ = rtap.oui[1];
675 *pos++ = rtap.oui[2];
677 put_unaligned_le16(rtap.len, pos);
679 /* align the actual payload as requested */
680 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
682 /* data (and possible padding) already follows */
686 static struct sk_buff *
687 ieee80211_make_monitor_skb(struct ieee80211_local *local,
688 struct sk_buff **origskb,
689 struct ieee80211_rate *rate,
690 int rtap_space, bool use_origskb)
692 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
693 int rt_hdrlen, needed_headroom;
696 /* room for the radiotap header based on driver features */
697 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
698 needed_headroom = rt_hdrlen - rtap_space;
701 /* only need to expand headroom if necessary */
706 * This shouldn't trigger often because most devices have an
707 * RX header they pull before we get here, and that should
708 * be big enough for our radiotap information. We should
709 * probably export the length to drivers so that we can have
710 * them allocate enough headroom to start with.
712 if (skb_headroom(skb) < needed_headroom &&
713 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
719 * Need to make a copy and possibly remove radiotap header
720 * and FCS from the original.
722 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
728 /* prepend radiotap information */
729 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
731 skb_reset_mac_header(skb);
732 skb->ip_summed = CHECKSUM_UNNECESSARY;
733 skb->pkt_type = PACKET_OTHERHOST;
734 skb->protocol = htons(ETH_P_802_2);
740 * This function copies a received frame to all monitor interfaces and
741 * returns a cleaned-up SKB that no longer includes the FCS nor the
742 * radiotap header the driver might have added.
744 static struct sk_buff *
745 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
746 struct ieee80211_rate *rate)
748 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
749 struct ieee80211_sub_if_data *sdata;
750 struct sk_buff *monskb = NULL;
751 int present_fcs_len = 0;
752 unsigned int rtap_space = 0;
753 struct ieee80211_sub_if_data *monitor_sdata =
754 rcu_dereference(local->monitor_sdata);
755 bool only_monitor = false;
757 if (status->flag & RX_FLAG_RADIOTAP_HE)
758 rtap_space += sizeof(struct ieee80211_radiotap_he);
760 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
761 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
763 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
764 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
766 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
770 * First, we may need to make a copy of the skb because
771 * (1) we need to modify it for radiotap (if not present), and
772 * (2) the other RX handlers will modify the skb we got.
774 * We don't need to, of course, if we aren't going to return
775 * the SKB because it has a bad FCS/PLCP checksum.
778 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
779 if (unlikely(origskb->len <= FCS_LEN)) {
782 dev_kfree_skb(origskb);
785 present_fcs_len = FCS_LEN;
788 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
789 if (!pskb_may_pull(origskb, 2 + rtap_space)) {
790 dev_kfree_skb(origskb);
794 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
796 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
798 dev_kfree_skb(origskb);
802 remove_monitor_info(origskb, present_fcs_len, rtap_space);
806 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
808 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
809 bool last_monitor = list_is_last(&sdata->u.mntr.list,
813 monskb = ieee80211_make_monitor_skb(local, &origskb,
825 skb = skb_clone(monskb, GFP_ATOMIC);
829 skb->dev = sdata->dev;
830 ieee80211_rx_stats(skb->dev, skb->len);
831 netif_receive_skb(skb);
839 /* this happens if last_monitor was erroneously false */
840 dev_kfree_skb(monskb);
846 remove_monitor_info(origskb, present_fcs_len, rtap_space);
850 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
852 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
853 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
854 int tid, seqno_idx, security_idx;
856 /* does the frame have a qos control field? */
857 if (ieee80211_is_data_qos(hdr->frame_control)) {
858 u8 *qc = ieee80211_get_qos_ctl(hdr);
859 /* frame has qos control */
860 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
861 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
862 status->rx_flags |= IEEE80211_RX_AMSDU;
868 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
870 * Sequence numbers for management frames, QoS data
871 * frames with a broadcast/multicast address in the
872 * Address 1 field, and all non-QoS data frames sent
873 * by QoS STAs are assigned using an additional single
874 * modulo-4096 counter, [...]
876 * We also use that counter for non-QoS STAs.
878 seqno_idx = IEEE80211_NUM_TIDS;
880 if (ieee80211_is_mgmt(hdr->frame_control))
881 security_idx = IEEE80211_NUM_TIDS;
885 rx->seqno_idx = seqno_idx;
886 rx->security_idx = security_idx;
887 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
888 * For now, set skb->priority to 0 for other cases. */
889 rx->skb->priority = (tid > 7) ? 0 : tid;
893 * DOC: Packet alignment
895 * Drivers always need to pass packets that are aligned to two-byte boundaries
898 * Additionally, should, if possible, align the payload data in a way that
899 * guarantees that the contained IP header is aligned to a four-byte
900 * boundary. In the case of regular frames, this simply means aligning the
901 * payload to a four-byte boundary (because either the IP header is directly
902 * contained, or IV/RFC1042 headers that have a length divisible by four are
903 * in front of it). If the payload data is not properly aligned and the
904 * architecture doesn't support efficient unaligned operations, mac80211
905 * will align the data.
907 * With A-MSDU frames, however, the payload data address must yield two modulo
908 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
909 * push the IP header further back to a multiple of four again. Thankfully, the
910 * specs were sane enough this time around to require padding each A-MSDU
911 * subframe to a length that is a multiple of four.
913 * Padding like Atheros hardware adds which is between the 802.11 header and
914 * the payload is not supported, the driver is required to move the 802.11
915 * header to be directly in front of the payload in that case.
917 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
919 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
920 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
927 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
929 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
931 if (is_multicast_ether_addr(hdr->addr1))
934 return ieee80211_is_robust_mgmt_frame(skb);
938 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
940 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
942 if (!is_multicast_ether_addr(hdr->addr1))
945 return ieee80211_is_robust_mgmt_frame(skb);
949 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
950 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
952 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
953 struct ieee80211_mmie *mmie;
954 struct ieee80211_mmie_16 *mmie16;
956 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
959 if (!ieee80211_is_robust_mgmt_frame(skb))
960 return -1; /* not a robust management frame */
962 mmie = (struct ieee80211_mmie *)
963 (skb->data + skb->len - sizeof(*mmie));
964 if (mmie->element_id == WLAN_EID_MMIE &&
965 mmie->length == sizeof(*mmie) - 2)
966 return le16_to_cpu(mmie->key_id);
968 mmie16 = (struct ieee80211_mmie_16 *)
969 (skb->data + skb->len - sizeof(*mmie16));
970 if (skb->len >= 24 + sizeof(*mmie16) &&
971 mmie16->element_id == WLAN_EID_MMIE &&
972 mmie16->length == sizeof(*mmie16) - 2)
973 return le16_to_cpu(mmie16->key_id);
978 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
981 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
986 fc = hdr->frame_control;
987 hdrlen = ieee80211_hdrlen(fc);
989 if (skb->len < hdrlen + cs->hdr_len)
992 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
993 keyid &= cs->key_idx_mask;
994 keyid >>= cs->key_idx_shift;
999 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1001 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1002 char *dev_addr = rx->sdata->vif.addr;
1004 if (ieee80211_is_data(hdr->frame_control)) {
1005 if (is_multicast_ether_addr(hdr->addr1)) {
1006 if (ieee80211_has_tods(hdr->frame_control) ||
1007 !ieee80211_has_fromds(hdr->frame_control))
1008 return RX_DROP_MONITOR;
1009 if (ether_addr_equal(hdr->addr3, dev_addr))
1010 return RX_DROP_MONITOR;
1012 if (!ieee80211_has_a4(hdr->frame_control))
1013 return RX_DROP_MONITOR;
1014 if (ether_addr_equal(hdr->addr4, dev_addr))
1015 return RX_DROP_MONITOR;
1019 /* If there is not an established peer link and this is not a peer link
1020 * establisment frame, beacon or probe, drop the frame.
1023 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1024 struct ieee80211_mgmt *mgmt;
1026 if (!ieee80211_is_mgmt(hdr->frame_control))
1027 return RX_DROP_MONITOR;
1029 if (ieee80211_is_action(hdr->frame_control)) {
1032 /* make sure category field is present */
1033 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1034 return RX_DROP_MONITOR;
1036 mgmt = (struct ieee80211_mgmt *)hdr;
1037 category = mgmt->u.action.category;
1038 if (category != WLAN_CATEGORY_MESH_ACTION &&
1039 category != WLAN_CATEGORY_SELF_PROTECTED)
1040 return RX_DROP_MONITOR;
1044 if (ieee80211_is_probe_req(hdr->frame_control) ||
1045 ieee80211_is_probe_resp(hdr->frame_control) ||
1046 ieee80211_is_beacon(hdr->frame_control) ||
1047 ieee80211_is_auth(hdr->frame_control))
1050 return RX_DROP_MONITOR;
1056 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1059 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1060 struct sk_buff *tail = skb_peek_tail(frames);
1061 struct ieee80211_rx_status *status;
1063 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1069 status = IEEE80211_SKB_RXCB(tail);
1070 if (status->flag & RX_FLAG_AMSDU_MORE)
1076 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1077 struct tid_ampdu_rx *tid_agg_rx,
1079 struct sk_buff_head *frames)
1081 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1082 struct sk_buff *skb;
1083 struct ieee80211_rx_status *status;
1085 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1087 if (skb_queue_empty(skb_list))
1090 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1091 __skb_queue_purge(skb_list);
1095 /* release frames from the reorder ring buffer */
1096 tid_agg_rx->stored_mpdu_num--;
1097 while ((skb = __skb_dequeue(skb_list))) {
1098 status = IEEE80211_SKB_RXCB(skb);
1099 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1100 __skb_queue_tail(frames, skb);
1104 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1105 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1108 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1109 struct tid_ampdu_rx *tid_agg_rx,
1111 struct sk_buff_head *frames)
1115 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1117 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1118 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1119 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1125 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1126 * the skb was added to the buffer longer than this time ago, the earlier
1127 * frames that have not yet been received are assumed to be lost and the skb
1128 * can be released for processing. This may also release other skb's from the
1129 * reorder buffer if there are no additional gaps between the frames.
1131 * Callers must hold tid_agg_rx->reorder_lock.
1133 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1135 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1136 struct tid_ampdu_rx *tid_agg_rx,
1137 struct sk_buff_head *frames)
1141 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1143 /* release the buffer until next missing frame */
1144 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1145 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1146 tid_agg_rx->stored_mpdu_num) {
1148 * No buffers ready to be released, but check whether any
1149 * frames in the reorder buffer have timed out.
1152 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1153 j = (j + 1) % tid_agg_rx->buf_size) {
1154 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1159 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1160 HT_RX_REORDER_BUF_TIMEOUT))
1161 goto set_release_timer;
1163 /* don't leave incomplete A-MSDUs around */
1164 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1165 i = (i + 1) % tid_agg_rx->buf_size)
1166 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1168 ht_dbg_ratelimited(sdata,
1169 "release an RX reorder frame due to timeout on earlier frames\n");
1170 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1174 * Increment the head seq# also for the skipped slots.
1176 tid_agg_rx->head_seq_num =
1177 (tid_agg_rx->head_seq_num +
1178 skipped) & IEEE80211_SN_MASK;
1181 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1182 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1184 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1187 if (tid_agg_rx->stored_mpdu_num) {
1188 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1190 for (; j != (index - 1) % tid_agg_rx->buf_size;
1191 j = (j + 1) % tid_agg_rx->buf_size) {
1192 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1198 if (!tid_agg_rx->removed)
1199 mod_timer(&tid_agg_rx->reorder_timer,
1200 tid_agg_rx->reorder_time[j] + 1 +
1201 HT_RX_REORDER_BUF_TIMEOUT);
1203 del_timer(&tid_agg_rx->reorder_timer);
1208 * As this function belongs to the RX path it must be under
1209 * rcu_read_lock protection. It returns false if the frame
1210 * can be processed immediately, true if it was consumed.
1212 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1213 struct tid_ampdu_rx *tid_agg_rx,
1214 struct sk_buff *skb,
1215 struct sk_buff_head *frames)
1217 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1218 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1219 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1220 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1221 u16 head_seq_num, buf_size;
1225 spin_lock(&tid_agg_rx->reorder_lock);
1228 * Offloaded BA sessions have no known starting sequence number so pick
1229 * one from first Rxed frame for this tid after BA was started.
1231 if (unlikely(tid_agg_rx->auto_seq)) {
1232 tid_agg_rx->auto_seq = false;
1233 tid_agg_rx->ssn = mpdu_seq_num;
1234 tid_agg_rx->head_seq_num = mpdu_seq_num;
1237 buf_size = tid_agg_rx->buf_size;
1238 head_seq_num = tid_agg_rx->head_seq_num;
1241 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1244 if (unlikely(!tid_agg_rx->started)) {
1245 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1249 tid_agg_rx->started = true;
1252 /* frame with out of date sequence number */
1253 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1259 * If frame the sequence number exceeds our buffering window
1260 * size release some previous frames to make room for this one.
1262 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1263 head_seq_num = ieee80211_sn_inc(
1264 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1265 /* release stored frames up to new head to stack */
1266 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1267 head_seq_num, frames);
1270 /* Now the new frame is always in the range of the reordering buffer */
1272 index = mpdu_seq_num % tid_agg_rx->buf_size;
1274 /* check if we already stored this frame */
1275 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1281 * If the current MPDU is in the right order and nothing else
1282 * is stored we can process it directly, no need to buffer it.
1283 * If it is first but there's something stored, we may be able
1284 * to release frames after this one.
1286 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1287 tid_agg_rx->stored_mpdu_num == 0) {
1288 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1289 tid_agg_rx->head_seq_num =
1290 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1295 /* put the frame in the reordering buffer */
1296 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1297 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1298 tid_agg_rx->reorder_time[index] = jiffies;
1299 tid_agg_rx->stored_mpdu_num++;
1300 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1304 spin_unlock(&tid_agg_rx->reorder_lock);
1309 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1310 * true if the MPDU was buffered, false if it should be processed.
1312 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1313 struct sk_buff_head *frames)
1315 struct sk_buff *skb = rx->skb;
1316 struct ieee80211_local *local = rx->local;
1317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1318 struct sta_info *sta = rx->sta;
1319 struct tid_ampdu_rx *tid_agg_rx;
1323 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1324 is_multicast_ether_addr(hdr->addr1))
1328 * filter the QoS data rx stream according to
1329 * STA/TID and check if this STA/TID is on aggregation
1335 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1336 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1337 tid = ieee80211_get_tid(hdr);
1339 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1341 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1342 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1343 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1344 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1345 WLAN_BACK_RECIPIENT,
1346 WLAN_REASON_QSTA_REQUIRE_SETUP);
1350 /* qos null data frames are excluded */
1351 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1354 /* not part of a BA session */
1355 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1356 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1359 /* new, potentially un-ordered, ampdu frame - process it */
1361 /* reset session timer */
1362 if (tid_agg_rx->timeout)
1363 tid_agg_rx->last_rx = jiffies;
1365 /* if this mpdu is fragmented - terminate rx aggregation session */
1366 sc = le16_to_cpu(hdr->seq_ctrl);
1367 if (sc & IEEE80211_SCTL_FRAG) {
1368 skb_queue_tail(&rx->sdata->skb_queue, skb);
1369 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1374 * No locking needed -- we will only ever process one
1375 * RX packet at a time, and thus own tid_agg_rx. All
1376 * other code manipulating it needs to (and does) make
1377 * sure that we cannot get to it any more before doing
1380 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1385 __skb_queue_tail(frames, skb);
1388 static ieee80211_rx_result debug_noinline
1389 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1392 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1394 if (status->flag & RX_FLAG_DUP_VALIDATED)
1398 * Drop duplicate 802.11 retransmissions
1399 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1402 if (rx->skb->len < 24)
1405 if (ieee80211_is_ctl(hdr->frame_control) ||
1406 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1407 is_multicast_ether_addr(hdr->addr1))
1413 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1414 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1415 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1416 rx->sta->rx_stats.num_duplicates++;
1417 return RX_DROP_UNUSABLE;
1418 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1419 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1425 static ieee80211_rx_result debug_noinline
1426 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1428 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1430 /* Drop disallowed frame classes based on STA auth/assoc state;
1431 * IEEE 802.11, Chap 5.5.
1433 * mac80211 filters only based on association state, i.e. it drops
1434 * Class 3 frames from not associated stations. hostapd sends
1435 * deauth/disassoc frames when needed. In addition, hostapd is
1436 * responsible for filtering on both auth and assoc states.
1439 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1440 return ieee80211_rx_mesh_check(rx);
1442 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1443 ieee80211_is_pspoll(hdr->frame_control)) &&
1444 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1445 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1446 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1447 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1449 * accept port control frames from the AP even when it's not
1450 * yet marked ASSOC to prevent a race where we don't set the
1451 * assoc bit quickly enough before it sends the first frame
1453 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1454 ieee80211_is_data_present(hdr->frame_control)) {
1455 unsigned int hdrlen;
1458 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1460 if (rx->skb->len < hdrlen + 8)
1461 return RX_DROP_MONITOR;
1463 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1464 if (ethertype == rx->sdata->control_port_protocol)
1468 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1469 cfg80211_rx_spurious_frame(rx->sdata->dev,
1472 return RX_DROP_UNUSABLE;
1474 return RX_DROP_MONITOR;
1481 static ieee80211_rx_result debug_noinline
1482 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1484 struct ieee80211_local *local;
1485 struct ieee80211_hdr *hdr;
1486 struct sk_buff *skb;
1490 hdr = (struct ieee80211_hdr *) skb->data;
1492 if (!local->pspolling)
1495 if (!ieee80211_has_fromds(hdr->frame_control))
1496 /* this is not from AP */
1499 if (!ieee80211_is_data(hdr->frame_control))
1502 if (!ieee80211_has_moredata(hdr->frame_control)) {
1503 /* AP has no more frames buffered for us */
1504 local->pspolling = false;
1508 /* more data bit is set, let's request a new frame from the AP */
1509 ieee80211_send_pspoll(local, rx->sdata);
1514 static void sta_ps_start(struct sta_info *sta)
1516 struct ieee80211_sub_if_data *sdata = sta->sdata;
1517 struct ieee80211_local *local = sdata->local;
1521 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1522 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1523 ps = &sdata->bss->ps;
1527 atomic_inc(&ps->num_sta_ps);
1528 set_sta_flag(sta, WLAN_STA_PS_STA);
1529 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1530 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1531 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1532 sta->sta.addr, sta->sta.aid);
1534 ieee80211_clear_fast_xmit(sta);
1536 if (!sta->sta.txq[0])
1539 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1540 if (txq_has_queue(sta->sta.txq[tid]))
1541 set_bit(tid, &sta->txq_buffered_tids);
1543 clear_bit(tid, &sta->txq_buffered_tids);
1547 static void sta_ps_end(struct sta_info *sta)
1549 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1550 sta->sta.addr, sta->sta.aid);
1552 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1554 * Clear the flag only if the other one is still set
1555 * so that the TX path won't start TX'ing new frames
1556 * directly ... In the case that the driver flag isn't
1557 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1559 clear_sta_flag(sta, WLAN_STA_PS_STA);
1560 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1561 sta->sta.addr, sta->sta.aid);
1565 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1566 clear_sta_flag(sta, WLAN_STA_PS_STA);
1567 ieee80211_sta_ps_deliver_wakeup(sta);
1570 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1572 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1575 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1577 /* Don't let the same PS state be set twice */
1578 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1579 if ((start && in_ps) || (!start && !in_ps))
1589 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1591 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1593 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1595 if (test_sta_flag(sta, WLAN_STA_SP))
1598 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1599 ieee80211_sta_ps_deliver_poll_response(sta);
1601 set_sta_flag(sta, WLAN_STA_PSPOLL);
1603 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1605 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1607 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1608 int ac = ieee80211_ac_from_tid(tid);
1611 * If this AC is not trigger-enabled do nothing unless the
1612 * driver is calling us after it already checked.
1614 * NB: This could/should check a separate bitmap of trigger-
1615 * enabled queues, but for now we only implement uAPSD w/o
1616 * TSPEC changes to the ACs, so they're always the same.
1618 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1619 tid != IEEE80211_NUM_TIDS)
1622 /* if we are in a service period, do nothing */
1623 if (test_sta_flag(sta, WLAN_STA_SP))
1626 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1627 ieee80211_sta_ps_deliver_uapsd(sta);
1629 set_sta_flag(sta, WLAN_STA_UAPSD);
1631 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1633 static ieee80211_rx_result debug_noinline
1634 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1636 struct ieee80211_sub_if_data *sdata = rx->sdata;
1637 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1638 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1643 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1644 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1648 * The device handles station powersave, so don't do anything about
1649 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1650 * it to mac80211 since they're handled.)
1652 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1656 * Don't do anything if the station isn't already asleep. In
1657 * the uAPSD case, the station will probably be marked asleep,
1658 * in the PS-Poll case the station must be confused ...
1660 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1663 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1664 ieee80211_sta_pspoll(&rx->sta->sta);
1666 /* Free PS Poll skb here instead of returning RX_DROP that would
1667 * count as an dropped frame. */
1668 dev_kfree_skb(rx->skb);
1671 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1672 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1673 ieee80211_has_pm(hdr->frame_control) &&
1674 (ieee80211_is_data_qos(hdr->frame_control) ||
1675 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1676 u8 tid = ieee80211_get_tid(hdr);
1678 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1684 static ieee80211_rx_result debug_noinline
1685 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1687 struct sta_info *sta = rx->sta;
1688 struct sk_buff *skb = rx->skb;
1689 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1690 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1697 * Update last_rx only for IBSS packets which are for the current
1698 * BSSID and for station already AUTHORIZED to avoid keeping the
1699 * current IBSS network alive in cases where other STAs start
1700 * using different BSSID. This will also give the station another
1701 * chance to restart the authentication/authorization in case
1702 * something went wrong the first time.
1704 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1705 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1706 NL80211_IFTYPE_ADHOC);
1707 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1708 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1709 sta->rx_stats.last_rx = jiffies;
1710 if (ieee80211_is_data(hdr->frame_control) &&
1711 !is_multicast_ether_addr(hdr->addr1))
1712 sta->rx_stats.last_rate =
1713 sta_stats_encode_rate(status);
1715 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1716 sta->rx_stats.last_rx = jiffies;
1717 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1719 * Mesh beacons will update last_rx when if they are found to
1720 * match the current local configuration when processed.
1722 sta->rx_stats.last_rx = jiffies;
1723 if (ieee80211_is_data(hdr->frame_control))
1724 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1727 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1728 ieee80211_sta_rx_notify(rx->sdata, hdr);
1730 sta->rx_stats.fragments++;
1732 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1733 sta->rx_stats.bytes += rx->skb->len;
1734 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1736 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1737 sta->rx_stats.last_signal = status->signal;
1738 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1741 if (status->chains) {
1742 sta->rx_stats.chains = status->chains;
1743 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1744 int signal = status->chain_signal[i];
1746 if (!(status->chains & BIT(i)))
1749 sta->rx_stats.chain_signal_last[i] = signal;
1750 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1756 * Change STA power saving mode only at the end of a frame
1757 * exchange sequence, and only for a data or management
1758 * frame as specified in IEEE 802.11-2016 11.2.3.2
1760 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1761 !ieee80211_has_morefrags(hdr->frame_control) &&
1762 !is_multicast_ether_addr(hdr->addr1) &&
1763 (ieee80211_is_mgmt(hdr->frame_control) ||
1764 ieee80211_is_data(hdr->frame_control)) &&
1765 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1766 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1767 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1768 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1769 if (!ieee80211_has_pm(hdr->frame_control))
1772 if (ieee80211_has_pm(hdr->frame_control))
1777 /* mesh power save support */
1778 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1779 ieee80211_mps_rx_h_sta_process(sta, hdr);
1782 * Drop (qos-)data::nullfunc frames silently, since they
1783 * are used only to control station power saving mode.
1785 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1786 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1787 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1790 * If we receive a 4-addr nullfunc frame from a STA
1791 * that was not moved to a 4-addr STA vlan yet send
1792 * the event to userspace and for older hostapd drop
1793 * the frame to the monitor interface.
1795 if (ieee80211_has_a4(hdr->frame_control) &&
1796 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1797 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1798 !rx->sdata->u.vlan.sta))) {
1799 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1800 cfg80211_rx_unexpected_4addr_frame(
1801 rx->sdata->dev, sta->sta.addr,
1803 return RX_DROP_MONITOR;
1806 * Update counter and free packet here to avoid
1807 * counting this as a dropped packed.
1809 sta->rx_stats.packets++;
1810 dev_kfree_skb(rx->skb);
1815 } /* ieee80211_rx_h_sta_process */
1817 static ieee80211_rx_result debug_noinline
1818 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1820 struct sk_buff *skb = rx->skb;
1821 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1822 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1825 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1826 struct ieee80211_key *sta_ptk = NULL;
1827 int mmie_keyidx = -1;
1829 const struct ieee80211_cipher_scheme *cs = NULL;
1834 * There are four types of keys:
1835 * - GTK (group keys)
1836 * - IGTK (group keys for management frames)
1837 * - PTK (pairwise keys)
1838 * - STK (station-to-station pairwise keys)
1840 * When selecting a key, we have to distinguish between multicast
1841 * (including broadcast) and unicast frames, the latter can only
1842 * use PTKs and STKs while the former always use GTKs and IGTKs.
1843 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1844 * unicast frames can also use key indices like GTKs. Hence, if we
1845 * don't have a PTK/STK we check the key index for a WEP key.
1847 * Note that in a regular BSS, multicast frames are sent by the
1848 * AP only, associated stations unicast the frame to the AP first
1849 * which then multicasts it on their behalf.
1851 * There is also a slight problem in IBSS mode: GTKs are negotiated
1852 * with each station, that is something we don't currently handle.
1853 * The spec seems to expect that one negotiates the same key with
1854 * every station but there's no such requirement; VLANs could be
1858 /* start without a key */
1860 fc = hdr->frame_control;
1863 int keyid = rx->sta->ptk_idx;
1865 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1866 cs = rx->sta->cipher_scheme;
1867 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1868 if (unlikely(keyid < 0))
1869 return RX_DROP_UNUSABLE;
1871 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1874 if (!ieee80211_has_protected(fc))
1875 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1877 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1879 if ((status->flag & RX_FLAG_DECRYPTED) &&
1880 (status->flag & RX_FLAG_IV_STRIPPED))
1882 /* Skip decryption if the frame is not protected. */
1883 if (!ieee80211_has_protected(fc))
1885 } else if (mmie_keyidx >= 0) {
1886 /* Broadcast/multicast robust management frame / BIP */
1887 if ((status->flag & RX_FLAG_DECRYPTED) &&
1888 (status->flag & RX_FLAG_IV_STRIPPED))
1891 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1892 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1893 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1895 if (ieee80211_is_group_privacy_action(skb) &&
1896 test_sta_flag(rx->sta, WLAN_STA_MFP))
1897 return RX_DROP_MONITOR;
1899 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1902 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1903 } else if (!ieee80211_has_protected(fc)) {
1905 * The frame was not protected, so skip decryption. However, we
1906 * need to set rx->key if there is a key that could have been
1907 * used so that the frame may be dropped if encryption would
1908 * have been expected.
1910 struct ieee80211_key *key = NULL;
1911 struct ieee80211_sub_if_data *sdata = rx->sdata;
1914 if (ieee80211_is_mgmt(fc) &&
1915 is_multicast_ether_addr(hdr->addr1) &&
1916 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1920 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1921 key = rcu_dereference(rx->sta->gtk[i]);
1927 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1928 key = rcu_dereference(sdata->keys[i]);
1941 * The device doesn't give us the IV so we won't be
1942 * able to look up the key. That's ok though, we
1943 * don't need to decrypt the frame, we just won't
1944 * be able to keep statistics accurate.
1945 * Except for key threshold notifications, should
1946 * we somehow allow the driver to tell us which key
1947 * the hardware used if this flag is set?
1949 if ((status->flag & RX_FLAG_DECRYPTED) &&
1950 (status->flag & RX_FLAG_IV_STRIPPED))
1953 hdrlen = ieee80211_hdrlen(fc);
1956 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1958 if (unlikely(keyidx < 0))
1959 return RX_DROP_UNUSABLE;
1961 if (rx->skb->len < 8 + hdrlen)
1962 return RX_DROP_UNUSABLE; /* TODO: count this? */
1964 * no need to call ieee80211_wep_get_keyidx,
1965 * it verifies a bunch of things we've done already
1967 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1968 keyidx = keyid >> 6;
1971 /* check per-station GTK first, if multicast packet */
1972 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1973 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1975 /* if not found, try default key */
1977 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1980 * RSNA-protected unicast frames should always be
1981 * sent with pairwise or station-to-station keys,
1982 * but for WEP we allow using a key index as well.
1985 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1986 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1987 !is_multicast_ether_addr(hdr->addr1))
1993 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1994 return RX_DROP_MONITOR;
1996 /* TODO: add threshold stuff again */
1998 return RX_DROP_MONITOR;
2001 switch (rx->key->conf.cipher) {
2002 case WLAN_CIPHER_SUITE_WEP40:
2003 case WLAN_CIPHER_SUITE_WEP104:
2004 result = ieee80211_crypto_wep_decrypt(rx);
2006 case WLAN_CIPHER_SUITE_TKIP:
2007 result = ieee80211_crypto_tkip_decrypt(rx);
2009 case WLAN_CIPHER_SUITE_CCMP:
2010 result = ieee80211_crypto_ccmp_decrypt(
2011 rx, IEEE80211_CCMP_MIC_LEN);
2013 case WLAN_CIPHER_SUITE_CCMP_256:
2014 result = ieee80211_crypto_ccmp_decrypt(
2015 rx, IEEE80211_CCMP_256_MIC_LEN);
2017 case WLAN_CIPHER_SUITE_AES_CMAC:
2018 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2020 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2021 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2023 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2024 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2025 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2027 case WLAN_CIPHER_SUITE_GCMP:
2028 case WLAN_CIPHER_SUITE_GCMP_256:
2029 result = ieee80211_crypto_gcmp_decrypt(rx);
2032 result = ieee80211_crypto_hw_decrypt(rx);
2035 /* the hdr variable is invalid after the decrypt handlers */
2037 /* either the frame has been decrypted or will be dropped */
2038 status->flag |= RX_FLAG_DECRYPTED;
2043 static inline struct ieee80211_fragment_entry *
2044 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2045 unsigned int frag, unsigned int seq, int rx_queue,
2046 struct sk_buff **skb)
2048 struct ieee80211_fragment_entry *entry;
2050 entry = &sdata->fragments[sdata->fragment_next++];
2051 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2052 sdata->fragment_next = 0;
2054 if (!skb_queue_empty(&entry->skb_list))
2055 __skb_queue_purge(&entry->skb_list);
2057 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2059 entry->first_frag_time = jiffies;
2061 entry->rx_queue = rx_queue;
2062 entry->last_frag = frag;
2063 entry->check_sequential_pn = false;
2064 entry->extra_len = 0;
2069 static inline struct ieee80211_fragment_entry *
2070 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2071 unsigned int frag, unsigned int seq,
2072 int rx_queue, struct ieee80211_hdr *hdr)
2074 struct ieee80211_fragment_entry *entry;
2077 idx = sdata->fragment_next;
2078 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2079 struct ieee80211_hdr *f_hdr;
2080 struct sk_buff *f_skb;
2084 idx = IEEE80211_FRAGMENT_MAX - 1;
2086 entry = &sdata->fragments[idx];
2087 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2088 entry->rx_queue != rx_queue ||
2089 entry->last_frag + 1 != frag)
2092 f_skb = __skb_peek(&entry->skb_list);
2093 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2096 * Check ftype and addresses are equal, else check next fragment
2098 if (((hdr->frame_control ^ f_hdr->frame_control) &
2099 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2100 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2101 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2104 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2105 __skb_queue_purge(&entry->skb_list);
2114 static ieee80211_rx_result debug_noinline
2115 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2117 struct ieee80211_hdr *hdr;
2120 unsigned int frag, seq;
2121 struct ieee80211_fragment_entry *entry;
2122 struct sk_buff *skb;
2124 hdr = (struct ieee80211_hdr *)rx->skb->data;
2125 fc = hdr->frame_control;
2127 if (ieee80211_is_ctl(fc))
2130 sc = le16_to_cpu(hdr->seq_ctrl);
2131 frag = sc & IEEE80211_SCTL_FRAG;
2133 if (is_multicast_ether_addr(hdr->addr1)) {
2134 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2138 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2141 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2143 if (skb_linearize(rx->skb))
2144 return RX_DROP_UNUSABLE;
2147 * skb_linearize() might change the skb->data and
2148 * previously cached variables (in this case, hdr) need to
2149 * be refreshed with the new data.
2151 hdr = (struct ieee80211_hdr *)rx->skb->data;
2152 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2155 /* This is the first fragment of a new frame. */
2156 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2157 rx->seqno_idx, &(rx->skb));
2159 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2160 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2161 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2162 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2163 ieee80211_has_protected(fc)) {
2164 int queue = rx->security_idx;
2166 /* Store CCMP/GCMP PN so that we can verify that the
2167 * next fragment has a sequential PN value.
2169 entry->check_sequential_pn = true;
2170 memcpy(entry->last_pn,
2171 rx->key->u.ccmp.rx_pn[queue],
2172 IEEE80211_CCMP_PN_LEN);
2173 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2175 offsetof(struct ieee80211_key,
2177 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2178 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2179 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2180 IEEE80211_GCMP_PN_LEN);
2185 /* This is a fragment for a frame that should already be pending in
2186 * fragment cache. Add this fragment to the end of the pending entry.
2188 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2189 rx->seqno_idx, hdr);
2191 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2192 return RX_DROP_MONITOR;
2195 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2196 * MPDU PN values are not incrementing in steps of 1."
2197 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2198 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2200 if (entry->check_sequential_pn) {
2202 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2206 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2207 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2208 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2209 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2210 return RX_DROP_UNUSABLE;
2211 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2212 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2217 queue = rx->security_idx;
2218 rpn = rx->key->u.ccmp.rx_pn[queue];
2219 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2220 return RX_DROP_UNUSABLE;
2221 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2224 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2225 __skb_queue_tail(&entry->skb_list, rx->skb);
2226 entry->last_frag = frag;
2227 entry->extra_len += rx->skb->len;
2228 if (ieee80211_has_morefrags(fc)) {
2233 rx->skb = __skb_dequeue(&entry->skb_list);
2234 if (skb_tailroom(rx->skb) < entry->extra_len) {
2235 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2236 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2238 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2239 __skb_queue_purge(&entry->skb_list);
2240 return RX_DROP_UNUSABLE;
2243 while ((skb = __skb_dequeue(&entry->skb_list))) {
2244 skb_put_data(rx->skb, skb->data, skb->len);
2249 ieee80211_led_rx(rx->local);
2252 rx->sta->rx_stats.packets++;
2256 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2258 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2264 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2266 struct sk_buff *skb = rx->skb;
2267 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2270 * Pass through unencrypted frames if the hardware has
2271 * decrypted them already.
2273 if (status->flag & RX_FLAG_DECRYPTED)
2276 /* Drop unencrypted frames if key is set. */
2277 if (unlikely(!ieee80211_has_protected(fc) &&
2278 !ieee80211_is_nullfunc(fc) &&
2279 ieee80211_is_data(fc) && rx->key))
2285 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2288 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2289 __le16 fc = hdr->frame_control;
2292 * Pass through unencrypted frames if the hardware has
2293 * decrypted them already.
2295 if (status->flag & RX_FLAG_DECRYPTED)
2298 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2299 if (unlikely(!ieee80211_has_protected(fc) &&
2300 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2302 if (ieee80211_is_deauth(fc) ||
2303 ieee80211_is_disassoc(fc))
2304 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2309 /* BIP does not use Protected field, so need to check MMIE */
2310 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2311 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2312 if (ieee80211_is_deauth(fc) ||
2313 ieee80211_is_disassoc(fc))
2314 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2320 * When using MFP, Action frames are not allowed prior to
2321 * having configured keys.
2323 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2324 ieee80211_is_robust_mgmt_frame(rx->skb)))
2332 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2334 struct ieee80211_sub_if_data *sdata = rx->sdata;
2335 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2336 bool check_port_control = false;
2337 struct ethhdr *ehdr;
2340 *port_control = false;
2341 if (ieee80211_has_a4(hdr->frame_control) &&
2342 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2345 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2346 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2348 if (!sdata->u.mgd.use_4addr)
2350 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2351 check_port_control = true;
2354 if (is_multicast_ether_addr(hdr->addr1) &&
2355 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2358 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2362 ehdr = (struct ethhdr *) rx->skb->data;
2363 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2364 *port_control = true;
2365 else if (check_port_control)
2372 * requires that rx->skb is a frame with ethernet header
2374 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2376 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2377 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2378 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2381 * Allow EAPOL frames to us/the PAE group address regardless
2382 * of whether the frame was encrypted or not.
2384 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2385 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2386 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2389 if (ieee80211_802_1x_port_control(rx) ||
2390 ieee80211_drop_unencrypted(rx, fc))
2396 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2397 struct ieee80211_rx_data *rx)
2399 struct ieee80211_sub_if_data *sdata = rx->sdata;
2400 struct net_device *dev = sdata->dev;
2402 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2403 skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2404 sdata->control_port_over_nl80211)) {
2405 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2406 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2408 cfg80211_rx_control_port(dev, skb, noencrypt);
2411 /* deliver to local stack */
2413 napi_gro_receive(rx->napi, skb);
2415 netif_receive_skb(skb);
2420 * requires that rx->skb is a frame with ethernet header
2423 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2425 struct ieee80211_sub_if_data *sdata = rx->sdata;
2426 struct net_device *dev = sdata->dev;
2427 struct sk_buff *skb, *xmit_skb;
2428 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2429 struct sta_info *dsta;
2434 ieee80211_rx_stats(dev, skb->len);
2437 /* The seqno index has the same property as needed
2438 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2439 * for non-QoS-data frames. Here we know it's a data
2440 * frame, so count MSDUs.
2442 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2443 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2444 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2447 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2448 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2449 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2450 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2451 if (is_multicast_ether_addr(ehdr->h_dest) &&
2452 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2454 * send multicast frames both to higher layers in
2455 * local net stack and back to the wireless medium
2457 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2459 net_info_ratelimited("%s: failed to clone multicast frame\n",
2461 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2462 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2463 dsta = sta_info_get(sdata, ehdr->h_dest);
2466 * The destination station is associated to
2467 * this AP (in this VLAN), so send the frame
2468 * directly to it and do not pass it to local
2477 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2479 /* 'align' will only take the values 0 or 2 here since all
2480 * frames are required to be aligned to 2-byte boundaries
2481 * when being passed to mac80211; the code here works just
2482 * as well if that isn't true, but mac80211 assumes it can
2483 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2487 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2489 if (WARN_ON(skb_headroom(skb) < 3)) {
2493 u8 *data = skb->data;
2494 size_t len = skb_headlen(skb);
2496 memmove(skb->data, data, len);
2497 skb_set_tail_pointer(skb, len);
2504 skb->protocol = eth_type_trans(skb, dev);
2505 memset(skb->cb, 0, sizeof(skb->cb));
2507 ieee80211_deliver_skb_to_local_stack(skb, rx);
2512 * Send to wireless media and increase priority by 256 to
2513 * keep the received priority instead of reclassifying
2514 * the frame (see cfg80211_classify8021d).
2516 xmit_skb->priority += 256;
2517 xmit_skb->protocol = htons(ETH_P_802_3);
2518 skb_reset_network_header(xmit_skb);
2519 skb_reset_mac_header(xmit_skb);
2520 dev_queue_xmit(xmit_skb);
2524 static ieee80211_rx_result debug_noinline
2525 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2527 struct net_device *dev = rx->sdata->dev;
2528 struct sk_buff *skb = rx->skb;
2529 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2530 __le16 fc = hdr->frame_control;
2531 struct sk_buff_head frame_list;
2532 struct ethhdr ethhdr;
2533 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2535 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2538 } else switch (rx->sdata->vif.type) {
2539 case NL80211_IFTYPE_AP:
2540 case NL80211_IFTYPE_AP_VLAN:
2543 case NL80211_IFTYPE_STATION:
2545 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2548 case NL80211_IFTYPE_MESH_POINT:
2556 __skb_queue_head_init(&frame_list);
2558 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2559 rx->sdata->vif.addr,
2560 rx->sdata->vif.type,
2562 return RX_DROP_UNUSABLE;
2564 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2565 rx->sdata->vif.type,
2566 rx->local->hw.extra_tx_headroom,
2567 check_da, check_sa);
2569 while (!skb_queue_empty(&frame_list)) {
2570 rx->skb = __skb_dequeue(&frame_list);
2572 if (!ieee80211_frame_allowed(rx, fc)) {
2573 dev_kfree_skb(rx->skb);
2577 ieee80211_deliver_skb(rx);
2583 static ieee80211_rx_result debug_noinline
2584 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2586 struct sk_buff *skb = rx->skb;
2587 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2589 __le16 fc = hdr->frame_control;
2591 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2594 if (unlikely(!ieee80211_is_data(fc)))
2597 if (unlikely(!ieee80211_is_data_present(fc)))
2598 return RX_DROP_MONITOR;
2600 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2601 switch (rx->sdata->vif.type) {
2602 case NL80211_IFTYPE_AP_VLAN:
2603 if (!rx->sdata->u.vlan.sta)
2604 return RX_DROP_UNUSABLE;
2606 case NL80211_IFTYPE_STATION:
2607 if (!rx->sdata->u.mgd.use_4addr)
2608 return RX_DROP_UNUSABLE;
2611 return RX_DROP_UNUSABLE;
2615 if (is_multicast_ether_addr(hdr->addr1))
2616 return RX_DROP_UNUSABLE;
2618 return __ieee80211_rx_h_amsdu(rx, 0);
2621 #ifdef CONFIG_MAC80211_MESH
2622 static ieee80211_rx_result
2623 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2625 struct ieee80211_hdr *fwd_hdr, *hdr;
2626 struct ieee80211_tx_info *info;
2627 struct ieee80211s_hdr *mesh_hdr;
2628 struct sk_buff *skb = rx->skb, *fwd_skb;
2629 struct ieee80211_local *local = rx->local;
2630 struct ieee80211_sub_if_data *sdata = rx->sdata;
2631 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2634 hdr = (struct ieee80211_hdr *) skb->data;
2635 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2637 /* make sure fixed part of mesh header is there, also checks skb len */
2638 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2639 return RX_DROP_MONITOR;
2641 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2643 /* make sure full mesh header is there, also checks skb len */
2644 if (!pskb_may_pull(rx->skb,
2645 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2646 return RX_DROP_MONITOR;
2648 /* reload pointers */
2649 hdr = (struct ieee80211_hdr *) skb->data;
2650 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2652 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2653 return RX_DROP_MONITOR;
2655 /* frame is in RMC, don't forward */
2656 if (ieee80211_is_data(hdr->frame_control) &&
2657 is_multicast_ether_addr(hdr->addr1) &&
2658 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2659 return RX_DROP_MONITOR;
2661 if (!ieee80211_is_data(hdr->frame_control))
2665 return RX_DROP_MONITOR;
2667 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2668 struct mesh_path *mppath;
2672 if (is_multicast_ether_addr(hdr->addr1)) {
2673 mpp_addr = hdr->addr3;
2674 proxied_addr = mesh_hdr->eaddr1;
2675 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2676 MESH_FLAGS_AE_A5_A6) {
2677 /* has_a4 already checked in ieee80211_rx_mesh_check */
2678 mpp_addr = hdr->addr4;
2679 proxied_addr = mesh_hdr->eaddr2;
2681 return RX_DROP_MONITOR;
2685 mppath = mpp_path_lookup(sdata, proxied_addr);
2687 mpp_path_add(sdata, proxied_addr, mpp_addr);
2689 spin_lock_bh(&mppath->state_lock);
2690 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2691 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2692 mppath->exp_time = jiffies;
2693 spin_unlock_bh(&mppath->state_lock);
2698 /* Frame has reached destination. Don't forward */
2699 if (!is_multicast_ether_addr(hdr->addr1) &&
2700 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2703 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2704 q = sdata->vif.hw_queue[ac];
2705 if (ieee80211_queue_stopped(&local->hw, q)) {
2706 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2707 return RX_DROP_MONITOR;
2709 skb_set_queue_mapping(skb, q);
2711 if (!--mesh_hdr->ttl) {
2712 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2716 if (!ifmsh->mshcfg.dot11MeshForwarding)
2719 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2720 sdata->encrypt_headroom, 0, GFP_ATOMIC);
2724 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2725 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2726 info = IEEE80211_SKB_CB(fwd_skb);
2727 memset(info, 0, sizeof(*info));
2728 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2729 info->control.vif = &rx->sdata->vif;
2730 info->control.jiffies = jiffies;
2731 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2732 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2733 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2734 /* update power mode indication when forwarding */
2735 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2736 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2737 /* mesh power mode flags updated in mesh_nexthop_lookup */
2738 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2740 /* unable to resolve next hop */
2741 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2743 WLAN_REASON_MESH_PATH_NOFORWARD,
2745 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2747 return RX_DROP_MONITOR;
2750 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2751 ieee80211_add_pending_skb(local, fwd_skb);
2753 if (is_multicast_ether_addr(hdr->addr1))
2755 return RX_DROP_MONITOR;
2759 static ieee80211_rx_result debug_noinline
2760 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2762 struct ieee80211_sub_if_data *sdata = rx->sdata;
2763 struct ieee80211_local *local = rx->local;
2764 struct net_device *dev = sdata->dev;
2765 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2766 __le16 fc = hdr->frame_control;
2770 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2773 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2774 return RX_DROP_MONITOR;
2777 * Send unexpected-4addr-frame event to hostapd. For older versions,
2778 * also drop the frame to cooked monitor interfaces.
2780 if (ieee80211_has_a4(hdr->frame_control) &&
2781 sdata->vif.type == NL80211_IFTYPE_AP) {
2783 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2784 cfg80211_rx_unexpected_4addr_frame(
2785 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2786 return RX_DROP_MONITOR;
2789 err = __ieee80211_data_to_8023(rx, &port_control);
2791 return RX_DROP_UNUSABLE;
2793 if (!ieee80211_frame_allowed(rx, fc))
2794 return RX_DROP_MONITOR;
2796 /* directly handle TDLS channel switch requests/responses */
2797 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2798 cpu_to_be16(ETH_P_TDLS))) {
2799 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2801 if (pskb_may_pull(rx->skb,
2802 offsetof(struct ieee80211_tdls_data, u)) &&
2803 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2804 tf->category == WLAN_CATEGORY_TDLS &&
2805 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2806 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2807 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2808 schedule_work(&local->tdls_chsw_work);
2810 rx->sta->rx_stats.packets++;
2816 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2817 unlikely(port_control) && sdata->bss) {
2818 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2826 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2827 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2828 !is_multicast_ether_addr(
2829 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2830 (!local->scanning &&
2831 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2832 mod_timer(&local->dynamic_ps_timer, jiffies +
2833 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2835 ieee80211_deliver_skb(rx);
2840 static ieee80211_rx_result debug_noinline
2841 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2843 struct sk_buff *skb = rx->skb;
2844 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2845 struct tid_ampdu_rx *tid_agg_rx;
2849 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2852 if (ieee80211_is_back_req(bar->frame_control)) {
2854 __le16 control, start_seq_num;
2855 } __packed bar_data;
2856 struct ieee80211_event event = {
2857 .type = BAR_RX_EVENT,
2861 return RX_DROP_MONITOR;
2863 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2864 &bar_data, sizeof(bar_data)))
2865 return RX_DROP_MONITOR;
2867 tid = le16_to_cpu(bar_data.control) >> 12;
2869 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2870 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2871 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2872 WLAN_BACK_RECIPIENT,
2873 WLAN_REASON_QSTA_REQUIRE_SETUP);
2875 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2877 return RX_DROP_MONITOR;
2879 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2880 event.u.ba.tid = tid;
2881 event.u.ba.ssn = start_seq_num;
2882 event.u.ba.sta = &rx->sta->sta;
2884 /* reset session timer */
2885 if (tid_agg_rx->timeout)
2886 mod_timer(&tid_agg_rx->session_timer,
2887 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2889 spin_lock(&tid_agg_rx->reorder_lock);
2890 /* release stored frames up to start of BAR */
2891 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2892 start_seq_num, frames);
2893 spin_unlock(&tid_agg_rx->reorder_lock);
2895 drv_event_callback(rx->local, rx->sdata, &event);
2902 * After this point, we only want management frames,
2903 * so we can drop all remaining control frames to
2904 * cooked monitor interfaces.
2906 return RX_DROP_MONITOR;
2909 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2910 struct ieee80211_mgmt *mgmt,
2913 struct ieee80211_local *local = sdata->local;
2914 struct sk_buff *skb;
2915 struct ieee80211_mgmt *resp;
2917 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2918 /* Not to own unicast address */
2922 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2923 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2924 /* Not from the current AP or not associated yet. */
2928 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2929 /* Too short SA Query request frame */
2933 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2937 skb_reserve(skb, local->hw.extra_tx_headroom);
2938 resp = skb_put_zero(skb, 24);
2939 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2940 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2941 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2942 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2943 IEEE80211_STYPE_ACTION);
2944 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2945 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2946 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2947 memcpy(resp->u.action.u.sa_query.trans_id,
2948 mgmt->u.action.u.sa_query.trans_id,
2949 WLAN_SA_QUERY_TR_ID_LEN);
2951 ieee80211_tx_skb(sdata, skb);
2954 static ieee80211_rx_result debug_noinline
2955 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2957 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2958 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2961 * From here on, look only at management frames.
2962 * Data and control frames are already handled,
2963 * and unknown (reserved) frames are useless.
2965 if (rx->skb->len < 24)
2966 return RX_DROP_MONITOR;
2968 if (!ieee80211_is_mgmt(mgmt->frame_control))
2969 return RX_DROP_MONITOR;
2971 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2972 ieee80211_is_beacon(mgmt->frame_control) &&
2973 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2976 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2977 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2978 sig = status->signal;
2980 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2981 rx->skb->data, rx->skb->len,
2983 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2986 if (ieee80211_drop_unencrypted_mgmt(rx))
2987 return RX_DROP_UNUSABLE;
2992 static ieee80211_rx_result debug_noinline
2993 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2995 struct ieee80211_local *local = rx->local;
2996 struct ieee80211_sub_if_data *sdata = rx->sdata;
2997 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2998 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2999 int len = rx->skb->len;
3001 if (!ieee80211_is_action(mgmt->frame_control))
3004 /* drop too small frames */
3005 if (len < IEEE80211_MIN_ACTION_SIZE)
3006 return RX_DROP_UNUSABLE;
3008 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3009 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3010 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3011 return RX_DROP_UNUSABLE;
3013 switch (mgmt->u.action.category) {
3014 case WLAN_CATEGORY_HT:
3015 /* reject HT action frames from stations not supporting HT */
3016 if (!rx->sta->sta.ht_cap.ht_supported)
3019 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3020 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3021 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3022 sdata->vif.type != NL80211_IFTYPE_AP &&
3023 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3026 /* verify action & smps_control/chanwidth are present */
3027 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3030 switch (mgmt->u.action.u.ht_smps.action) {
3031 case WLAN_HT_ACTION_SMPS: {
3032 struct ieee80211_supported_band *sband;
3033 enum ieee80211_smps_mode smps_mode;
3034 struct sta_opmode_info sta_opmode = {};
3036 /* convert to HT capability */
3037 switch (mgmt->u.action.u.ht_smps.smps_control) {
3038 case WLAN_HT_SMPS_CONTROL_DISABLED:
3039 smps_mode = IEEE80211_SMPS_OFF;
3041 case WLAN_HT_SMPS_CONTROL_STATIC:
3042 smps_mode = IEEE80211_SMPS_STATIC;
3044 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3045 smps_mode = IEEE80211_SMPS_DYNAMIC;
3051 /* if no change do nothing */
3052 if (rx->sta->sta.smps_mode == smps_mode)
3054 rx->sta->sta.smps_mode = smps_mode;
3055 sta_opmode.smps_mode =
3056 ieee80211_smps_mode_to_smps_mode(smps_mode);
3057 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3059 sband = rx->local->hw.wiphy->bands[status->band];
3061 rate_control_rate_update(local, sband, rx->sta,
3062 IEEE80211_RC_SMPS_CHANGED);
3063 cfg80211_sta_opmode_change_notify(sdata->dev,
3069 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3070 struct ieee80211_supported_band *sband;
3071 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3072 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3073 struct sta_opmode_info sta_opmode = {};
3075 /* If it doesn't support 40 MHz it can't change ... */
3076 if (!(rx->sta->sta.ht_cap.cap &
3077 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3080 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3081 max_bw = IEEE80211_STA_RX_BW_20;
3083 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3085 /* set cur_max_bandwidth and recalc sta bw */
3086 rx->sta->cur_max_bandwidth = max_bw;
3087 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3089 if (rx->sta->sta.bandwidth == new_bw)
3092 rx->sta->sta.bandwidth = new_bw;
3093 sband = rx->local->hw.wiphy->bands[status->band];
3095 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3096 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3098 rate_control_rate_update(local, sband, rx->sta,
3099 IEEE80211_RC_BW_CHANGED);
3100 cfg80211_sta_opmode_change_notify(sdata->dev,
3111 case WLAN_CATEGORY_PUBLIC:
3112 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3114 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3118 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3120 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3121 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3123 if (len < offsetof(struct ieee80211_mgmt,
3124 u.action.u.ext_chan_switch.variable))
3127 case WLAN_CATEGORY_VHT:
3128 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3129 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3130 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3131 sdata->vif.type != NL80211_IFTYPE_AP &&
3132 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3135 /* verify action code is present */
3136 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3139 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3140 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3141 /* verify opmode is present */
3142 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3146 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3147 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3155 case WLAN_CATEGORY_BACK:
3156 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3157 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3158 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3159 sdata->vif.type != NL80211_IFTYPE_AP &&
3160 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3163 /* verify action_code is present */
3164 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3167 switch (mgmt->u.action.u.addba_req.action_code) {
3168 case WLAN_ACTION_ADDBA_REQ:
3169 if (len < (IEEE80211_MIN_ACTION_SIZE +
3170 sizeof(mgmt->u.action.u.addba_req)))
3173 case WLAN_ACTION_ADDBA_RESP:
3174 if (len < (IEEE80211_MIN_ACTION_SIZE +
3175 sizeof(mgmt->u.action.u.addba_resp)))
3178 case WLAN_ACTION_DELBA:
3179 if (len < (IEEE80211_MIN_ACTION_SIZE +
3180 sizeof(mgmt->u.action.u.delba)))
3188 case WLAN_CATEGORY_SPECTRUM_MGMT:
3189 /* verify action_code is present */
3190 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3193 switch (mgmt->u.action.u.measurement.action_code) {
3194 case WLAN_ACTION_SPCT_MSR_REQ:
3195 if (status->band != NL80211_BAND_5GHZ)
3198 if (len < (IEEE80211_MIN_ACTION_SIZE +
3199 sizeof(mgmt->u.action.u.measurement)))
3202 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3205 ieee80211_process_measurement_req(sdata, mgmt, len);
3207 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3209 if (len < (IEEE80211_MIN_ACTION_SIZE +
3210 sizeof(mgmt->u.action.u.chan_switch)))
3213 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3214 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3215 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3218 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3219 bssid = sdata->u.mgd.bssid;
3220 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3221 bssid = sdata->u.ibss.bssid;
3222 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3227 if (!ether_addr_equal(mgmt->bssid, bssid))
3234 case WLAN_CATEGORY_SA_QUERY:
3235 if (len < (IEEE80211_MIN_ACTION_SIZE +
3236 sizeof(mgmt->u.action.u.sa_query)))
3239 switch (mgmt->u.action.u.sa_query.action) {
3240 case WLAN_ACTION_SA_QUERY_REQUEST:
3241 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3243 ieee80211_process_sa_query_req(sdata, mgmt, len);
3247 case WLAN_CATEGORY_SELF_PROTECTED:
3248 if (len < (IEEE80211_MIN_ACTION_SIZE +
3249 sizeof(mgmt->u.action.u.self_prot.action_code)))
3252 switch (mgmt->u.action.u.self_prot.action_code) {
3253 case WLAN_SP_MESH_PEERING_OPEN:
3254 case WLAN_SP_MESH_PEERING_CLOSE:
3255 case WLAN_SP_MESH_PEERING_CONFIRM:
3256 if (!ieee80211_vif_is_mesh(&sdata->vif))
3258 if (sdata->u.mesh.user_mpm)
3259 /* userspace handles this frame */
3262 case WLAN_SP_MGK_INFORM:
3263 case WLAN_SP_MGK_ACK:
3264 if (!ieee80211_vif_is_mesh(&sdata->vif))
3269 case WLAN_CATEGORY_MESH_ACTION:
3270 if (len < (IEEE80211_MIN_ACTION_SIZE +
3271 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3274 if (!ieee80211_vif_is_mesh(&sdata->vif))
3276 if (mesh_action_is_path_sel(mgmt) &&
3277 !mesh_path_sel_is_hwmp(sdata))
3285 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3286 /* will return in the next handlers */
3291 rx->sta->rx_stats.packets++;
3292 dev_kfree_skb(rx->skb);
3296 skb_queue_tail(&sdata->skb_queue, rx->skb);
3297 ieee80211_queue_work(&local->hw, &sdata->work);
3299 rx->sta->rx_stats.packets++;
3303 static ieee80211_rx_result debug_noinline
3304 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3306 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3309 /* skip known-bad action frames and return them in the next handler */
3310 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3314 * Getting here means the kernel doesn't know how to handle
3315 * it, but maybe userspace does ... include returned frames
3316 * so userspace can register for those to know whether ones
3317 * it transmitted were processed or returned.
3320 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3321 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3322 sig = status->signal;
3324 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3325 rx->skb->data, rx->skb->len, 0)) {
3327 rx->sta->rx_stats.packets++;
3328 dev_kfree_skb(rx->skb);
3335 static ieee80211_rx_result debug_noinline
3336 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3338 struct ieee80211_local *local = rx->local;
3339 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3340 struct sk_buff *nskb;
3341 struct ieee80211_sub_if_data *sdata = rx->sdata;
3342 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3344 if (!ieee80211_is_action(mgmt->frame_control))
3348 * For AP mode, hostapd is responsible for handling any action
3349 * frames that we didn't handle, including returning unknown
3350 * ones. For all other modes we will return them to the sender,
3351 * setting the 0x80 bit in the action category, as required by
3352 * 802.11-2012 9.24.4.
3353 * Newer versions of hostapd shall also use the management frame
3354 * registration mechanisms, but older ones still use cooked
3355 * monitor interfaces so push all frames there.
3357 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3358 (sdata->vif.type == NL80211_IFTYPE_AP ||
3359 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3360 return RX_DROP_MONITOR;
3362 if (is_multicast_ether_addr(mgmt->da))
3363 return RX_DROP_MONITOR;
3365 /* do not return rejected action frames */
3366 if (mgmt->u.action.category & 0x80)
3367 return RX_DROP_UNUSABLE;
3369 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3372 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3374 nmgmt->u.action.category |= 0x80;
3375 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3376 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3378 memset(nskb->cb, 0, sizeof(nskb->cb));
3380 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3381 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3383 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3384 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3385 IEEE80211_TX_CTL_NO_CCK_RATE;
3386 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3388 local->hw.offchannel_tx_hw_queue;
3391 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3394 dev_kfree_skb(rx->skb);
3398 static ieee80211_rx_result debug_noinline
3399 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3401 struct ieee80211_sub_if_data *sdata = rx->sdata;
3402 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3405 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3407 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3408 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3409 sdata->vif.type != NL80211_IFTYPE_OCB &&
3410 sdata->vif.type != NL80211_IFTYPE_STATION)
3411 return RX_DROP_MONITOR;
3414 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3415 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3416 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3417 /* process for all: mesh, mlme, ibss */
3419 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3420 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3421 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3422 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3423 if (is_multicast_ether_addr(mgmt->da) &&
3424 !is_broadcast_ether_addr(mgmt->da))
3425 return RX_DROP_MONITOR;
3427 /* process only for station */
3428 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3429 return RX_DROP_MONITOR;
3431 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3432 /* process only for ibss and mesh */
3433 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3434 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3435 return RX_DROP_MONITOR;
3438 return RX_DROP_MONITOR;
3441 /* queue up frame and kick off work to process it */
3442 skb_queue_tail(&sdata->skb_queue, rx->skb);
3443 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3445 rx->sta->rx_stats.packets++;
3450 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3451 struct ieee80211_rate *rate)
3453 struct ieee80211_sub_if_data *sdata;
3454 struct ieee80211_local *local = rx->local;
3455 struct sk_buff *skb = rx->skb, *skb2;
3456 struct net_device *prev_dev = NULL;
3457 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3458 int needed_headroom;
3461 * If cooked monitor has been processed already, then
3462 * don't do it again. If not, set the flag.
3464 if (rx->flags & IEEE80211_RX_CMNTR)
3466 rx->flags |= IEEE80211_RX_CMNTR;
3468 /* If there are no cooked monitor interfaces, just free the SKB */
3469 if (!local->cooked_mntrs)
3472 /* vendor data is long removed here */
3473 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3474 /* room for the radiotap header based on driver features */
3475 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3477 if (skb_headroom(skb) < needed_headroom &&
3478 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3481 /* prepend radiotap information */
3482 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3485 skb_reset_mac_header(skb);
3486 skb->ip_summed = CHECKSUM_UNNECESSARY;
3487 skb->pkt_type = PACKET_OTHERHOST;
3488 skb->protocol = htons(ETH_P_802_2);
3490 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3491 if (!ieee80211_sdata_running(sdata))
3494 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3495 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3499 skb2 = skb_clone(skb, GFP_ATOMIC);
3501 skb2->dev = prev_dev;
3502 netif_receive_skb(skb2);
3506 prev_dev = sdata->dev;
3507 ieee80211_rx_stats(sdata->dev, skb->len);
3511 skb->dev = prev_dev;
3512 netif_receive_skb(skb);
3520 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3521 ieee80211_rx_result res)
3524 case RX_DROP_MONITOR:
3525 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3527 rx->sta->rx_stats.dropped++;
3530 struct ieee80211_rate *rate = NULL;
3531 struct ieee80211_supported_band *sband;
3532 struct ieee80211_rx_status *status;
3534 status = IEEE80211_SKB_RXCB((rx->skb));
3536 sband = rx->local->hw.wiphy->bands[status->band];
3537 if (status->encoding == RX_ENC_LEGACY)
3538 rate = &sband->bitrates[status->rate_idx];
3540 ieee80211_rx_cooked_monitor(rx, rate);
3543 case RX_DROP_UNUSABLE:
3544 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3546 rx->sta->rx_stats.dropped++;
3547 dev_kfree_skb(rx->skb);
3550 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3555 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3556 struct sk_buff_head *frames)
3558 ieee80211_rx_result res = RX_DROP_MONITOR;
3559 struct sk_buff *skb;
3561 #define CALL_RXH(rxh) \
3564 if (res != RX_CONTINUE) \
3568 /* Lock here to avoid hitting all of the data used in the RX
3569 * path (e.g. key data, station data, ...) concurrently when
3570 * a frame is released from the reorder buffer due to timeout
3571 * from the timer, potentially concurrently with RX from the
3574 spin_lock_bh(&rx->local->rx_path_lock);
3576 while ((skb = __skb_dequeue(frames))) {
3578 * all the other fields are valid across frames
3579 * that belong to an aMPDU since they are on the
3580 * same TID from the same station
3584 CALL_RXH(ieee80211_rx_h_check_more_data);
3585 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3586 CALL_RXH(ieee80211_rx_h_sta_process);
3587 CALL_RXH(ieee80211_rx_h_decrypt);
3588 CALL_RXH(ieee80211_rx_h_defragment);
3589 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3590 /* must be after MMIC verify so header is counted in MPDU mic */
3591 #ifdef CONFIG_MAC80211_MESH
3592 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3593 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3595 CALL_RXH(ieee80211_rx_h_amsdu);
3596 CALL_RXH(ieee80211_rx_h_data);
3598 /* special treatment -- needs the queue */
3599 res = ieee80211_rx_h_ctrl(rx, frames);
3600 if (res != RX_CONTINUE)
3603 CALL_RXH(ieee80211_rx_h_mgmt_check);
3604 CALL_RXH(ieee80211_rx_h_action);
3605 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3606 CALL_RXH(ieee80211_rx_h_action_return);
3607 CALL_RXH(ieee80211_rx_h_mgmt);
3610 ieee80211_rx_handlers_result(rx, res);
3615 spin_unlock_bh(&rx->local->rx_path_lock);
3618 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3620 struct sk_buff_head reorder_release;
3621 ieee80211_rx_result res = RX_DROP_MONITOR;
3623 __skb_queue_head_init(&reorder_release);
3625 #define CALL_RXH(rxh) \
3628 if (res != RX_CONTINUE) \
3632 CALL_RXH(ieee80211_rx_h_check_dup);
3633 CALL_RXH(ieee80211_rx_h_check);
3635 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3637 ieee80211_rx_handlers(rx, &reorder_release);
3641 ieee80211_rx_handlers_result(rx, res);
3647 * This function makes calls into the RX path, therefore
3648 * it has to be invoked under RCU read lock.
3650 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3652 struct sk_buff_head frames;
3653 struct ieee80211_rx_data rx = {
3655 .sdata = sta->sdata,
3656 .local = sta->local,
3657 /* This is OK -- must be QoS data frame */
3658 .security_idx = tid,
3660 .napi = NULL, /* must be NULL to not have races */
3662 struct tid_ampdu_rx *tid_agg_rx;
3664 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3668 __skb_queue_head_init(&frames);
3670 spin_lock(&tid_agg_rx->reorder_lock);
3671 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3672 spin_unlock(&tid_agg_rx->reorder_lock);
3674 if (!skb_queue_empty(&frames)) {
3675 struct ieee80211_event event = {
3676 .type = BA_FRAME_TIMEOUT,
3678 .u.ba.sta = &sta->sta,
3680 drv_event_callback(rx.local, rx.sdata, &event);
3683 ieee80211_rx_handlers(&rx, &frames);
3686 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3687 u16 ssn, u64 filtered,
3690 struct sta_info *sta;
3691 struct tid_ampdu_rx *tid_agg_rx;
3692 struct sk_buff_head frames;
3693 struct ieee80211_rx_data rx = {
3694 /* This is OK -- must be QoS data frame */
3695 .security_idx = tid,
3700 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3703 __skb_queue_head_init(&frames);
3705 sta = container_of(pubsta, struct sta_info, sta);
3708 rx.sdata = sta->sdata;
3709 rx.local = sta->local;
3712 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3716 spin_lock_bh(&tid_agg_rx->reorder_lock);
3718 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3721 /* release all frames in the reorder buffer */
3722 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3723 IEEE80211_SN_MODULO;
3724 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3726 /* update ssn to match received ssn */
3727 tid_agg_rx->head_seq_num = ssn;
3729 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3733 /* handle the case that received ssn is behind the mac ssn.
3734 * it can be tid_agg_rx->buf_size behind and still be valid */
3735 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3736 if (diff >= tid_agg_rx->buf_size) {
3737 tid_agg_rx->reorder_buf_filtered = 0;
3740 filtered = filtered >> diff;
3744 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3745 int index = (ssn + i) % tid_agg_rx->buf_size;
3747 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3748 if (filtered & BIT_ULL(i))
3749 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3752 /* now process also frames that the filter marking released */
3753 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3756 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3758 ieee80211_rx_handlers(&rx, &frames);
3763 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3765 /* main receive path */
3767 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3769 struct ieee80211_sub_if_data *sdata = rx->sdata;
3770 struct sk_buff *skb = rx->skb;
3771 struct ieee80211_hdr *hdr = (void *)skb->data;
3772 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3773 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3774 bool multicast = is_multicast_ether_addr(hdr->addr1);
3776 switch (sdata->vif.type) {
3777 case NL80211_IFTYPE_STATION:
3778 if (!bssid && !sdata->u.mgd.use_4addr)
3782 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3783 case NL80211_IFTYPE_ADHOC:
3786 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3787 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3789 if (ieee80211_is_beacon(hdr->frame_control))
3791 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3794 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3798 if (status->encoding != RX_ENC_LEGACY)
3799 rate_idx = 0; /* TODO: HT/VHT rates */
3801 rate_idx = status->rate_idx;
3802 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3806 case NL80211_IFTYPE_OCB:
3809 if (!ieee80211_is_data_present(hdr->frame_control))
3811 if (!is_broadcast_ether_addr(bssid))
3814 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3818 if (status->encoding != RX_ENC_LEGACY)
3819 rate_idx = 0; /* TODO: HT rates */
3821 rate_idx = status->rate_idx;
3822 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3826 case NL80211_IFTYPE_MESH_POINT:
3827 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3831 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3832 case NL80211_IFTYPE_AP_VLAN:
3833 case NL80211_IFTYPE_AP:
3835 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3837 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3839 * Accept public action frames even when the
3840 * BSSID doesn't match, this is used for P2P
3841 * and location updates. Note that mac80211
3842 * itself never looks at these frames.
3845 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3847 if (ieee80211_is_public_action(hdr, skb->len))
3849 return ieee80211_is_beacon(hdr->frame_control);
3852 if (!ieee80211_has_tods(hdr->frame_control)) {
3853 /* ignore data frames to TDLS-peers */
3854 if (ieee80211_is_data(hdr->frame_control))
3856 /* ignore action frames to TDLS-peers */
3857 if (ieee80211_is_action(hdr->frame_control) &&
3858 !is_broadcast_ether_addr(bssid) &&
3859 !ether_addr_equal(bssid, hdr->addr1))
3864 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3865 * the BSSID - we've checked that already but may have accepted
3866 * the wildcard (ff:ff:ff:ff:ff:ff).
3869 * The BSSID of the Data frame is determined as follows:
3870 * a) If the STA is contained within an AP or is associated
3871 * with an AP, the BSSID is the address currently in use
3872 * by the STA contained in the AP.
3874 * So we should not accept data frames with an address that's
3877 * Accepting it also opens a security problem because stations
3878 * could encrypt it with the GTK and inject traffic that way.
3880 if (ieee80211_is_data(hdr->frame_control) && multicast)
3884 case NL80211_IFTYPE_WDS:
3885 if (bssid || !ieee80211_is_data(hdr->frame_control))
3887 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3888 case NL80211_IFTYPE_P2P_DEVICE:
3889 return ieee80211_is_public_action(hdr, skb->len) ||
3890 ieee80211_is_probe_req(hdr->frame_control) ||
3891 ieee80211_is_probe_resp(hdr->frame_control) ||
3892 ieee80211_is_beacon(hdr->frame_control);
3893 case NL80211_IFTYPE_NAN:
3894 /* Currently no frames on NAN interface are allowed */
3904 void ieee80211_check_fast_rx(struct sta_info *sta)
3906 struct ieee80211_sub_if_data *sdata = sta->sdata;
3907 struct ieee80211_local *local = sdata->local;
3908 struct ieee80211_key *key;
3909 struct ieee80211_fast_rx fastrx = {
3911 .vif_type = sdata->vif.type,
3912 .control_port_protocol = sdata->control_port_protocol,
3913 }, *old, *new = NULL;
3914 bool assign = false;
3916 /* use sparse to check that we don't return without updating */
3917 __acquire(check_fast_rx);
3919 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3920 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3921 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3922 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3924 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3926 /* fast-rx doesn't do reordering */
3927 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3928 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3931 switch (sdata->vif.type) {
3932 case NL80211_IFTYPE_STATION:
3933 if (sta->sta.tdls) {
3934 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3935 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3936 fastrx.expected_ds_bits = 0;
3938 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3939 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3940 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3941 fastrx.expected_ds_bits =
3942 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3945 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3946 fastrx.expected_ds_bits |=
3947 cpu_to_le16(IEEE80211_FCTL_TODS);
3948 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3949 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3952 if (!sdata->u.mgd.powersave)
3955 /* software powersave is a huge mess, avoid all of it */
3956 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3958 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3959 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3962 case NL80211_IFTYPE_AP_VLAN:
3963 case NL80211_IFTYPE_AP:
3964 /* parallel-rx requires this, at least with calls to
3965 * ieee80211_sta_ps_transition()
3967 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3969 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3970 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3971 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3973 fastrx.internal_forward =
3974 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3975 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3976 !sdata->u.vlan.sta);
3978 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3979 sdata->u.vlan.sta) {
3980 fastrx.expected_ds_bits |=
3981 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3982 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3983 fastrx.internal_forward = 0;
3991 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3995 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3997 switch (key->conf.cipher) {
3998 case WLAN_CIPHER_SUITE_TKIP:
3999 /* we don't want to deal with MMIC in fast-rx */
4001 case WLAN_CIPHER_SUITE_CCMP:
4002 case WLAN_CIPHER_SUITE_CCMP_256:
4003 case WLAN_CIPHER_SUITE_GCMP:
4004 case WLAN_CIPHER_SUITE_GCMP_256:
4007 /* we also don't want to deal with WEP or cipher scheme
4008 * since those require looking up the key idx in the
4009 * frame, rather than assuming the PTK is used
4010 * (we need to revisit this once we implement the real
4011 * PTK index, which is now valid in the spec, but we
4012 * haven't implemented that part yet)
4018 fastrx.icv_len = key->conf.icv_len;
4025 __release(check_fast_rx);
4028 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4030 spin_lock_bh(&sta->lock);
4031 old = rcu_dereference_protected(sta->fast_rx, true);
4032 rcu_assign_pointer(sta->fast_rx, new);
4033 spin_unlock_bh(&sta->lock);
4036 kfree_rcu(old, rcu_head);
4039 void ieee80211_clear_fast_rx(struct sta_info *sta)
4041 struct ieee80211_fast_rx *old;
4043 spin_lock_bh(&sta->lock);
4044 old = rcu_dereference_protected(sta->fast_rx, true);
4045 RCU_INIT_POINTER(sta->fast_rx, NULL);
4046 spin_unlock_bh(&sta->lock);
4049 kfree_rcu(old, rcu_head);
4052 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4054 struct ieee80211_local *local = sdata->local;
4055 struct sta_info *sta;
4057 lockdep_assert_held(&local->sta_mtx);
4059 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4060 if (sdata != sta->sdata &&
4061 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4063 ieee80211_check_fast_rx(sta);
4067 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4069 struct ieee80211_local *local = sdata->local;
4071 mutex_lock(&local->sta_mtx);
4072 __ieee80211_check_fast_rx_iface(sdata);
4073 mutex_unlock(&local->sta_mtx);
4076 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4077 struct ieee80211_fast_rx *fast_rx)
4079 struct sk_buff *skb = rx->skb;
4080 struct ieee80211_hdr *hdr = (void *)skb->data;
4081 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4082 struct sta_info *sta = rx->sta;
4083 int orig_len = skb->len;
4084 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4085 int snap_offs = hdrlen;
4087 u8 snap[sizeof(rfc1042_header)];
4089 } *payload __aligned(2);
4093 } addrs __aligned(2);
4094 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4096 if (fast_rx->uses_rss)
4097 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4099 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4100 * to a common data structure; drivers can implement that per queue
4101 * but we don't have that information in mac80211
4103 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4106 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4108 /* If using encryption, we also need to have:
4109 * - PN_VALIDATED: similar, but the implementation is tricky
4110 * - DECRYPTED: necessary for PN_VALIDATED
4113 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4116 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4119 if (unlikely(ieee80211_is_frag(hdr)))
4122 /* Since our interface address cannot be multicast, this
4123 * implicitly also rejects multicast frames without the
4126 * We shouldn't get any *data* frames not addressed to us
4127 * (AP mode will accept multicast *management* frames), but
4128 * punting here will make it go through the full checks in
4129 * ieee80211_accept_frame().
4131 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4134 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4135 IEEE80211_FCTL_TODS)) !=
4136 fast_rx->expected_ds_bits)
4139 /* assign the key to drop unencrypted frames (later)
4140 * and strip the IV/MIC if necessary
4142 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4143 /* GCMP header length is the same */
4144 snap_offs += IEEE80211_CCMP_HDR_LEN;
4147 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4148 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4151 payload = (void *)(skb->data + snap_offs);
4153 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4156 /* Don't handle these here since they require special code.
4157 * Accept AARP and IPX even though they should come with a
4158 * bridge-tunnel header - but if we get them this way then
4159 * there's little point in discarding them.
4161 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4162 payload->proto == fast_rx->control_port_protocol))
4166 /* after this point, don't punt to the slowpath! */
4168 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4169 pskb_trim(skb, skb->len - fast_rx->icv_len))
4172 if (unlikely(fast_rx->sta_notify)) {
4173 ieee80211_sta_rx_notify(rx->sdata, hdr);
4174 fast_rx->sta_notify = false;
4177 /* statistics part of ieee80211_rx_h_sta_process() */
4178 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4179 stats->last_signal = status->signal;
4180 if (!fast_rx->uses_rss)
4181 ewma_signal_add(&sta->rx_stats_avg.signal,
4185 if (status->chains) {
4188 stats->chains = status->chains;
4189 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4190 int signal = status->chain_signal[i];
4192 if (!(status->chains & BIT(i)))
4195 stats->chain_signal_last[i] = signal;
4196 if (!fast_rx->uses_rss)
4197 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4201 /* end of statistics */
4203 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4206 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4207 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4214 stats->last_rx = jiffies;
4215 stats->last_rate = sta_stats_encode_rate(status);
4220 /* do the header conversion - first grab the addresses */
4221 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4222 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4223 /* remove the SNAP but leave the ethertype */
4224 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4225 /* push the addresses in front */
4226 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4228 skb->dev = fast_rx->dev;
4230 ieee80211_rx_stats(fast_rx->dev, skb->len);
4232 /* The seqno index has the same property as needed
4233 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4234 * for non-QoS-data frames. Here we know it's a data
4235 * frame, so count MSDUs.
4237 u64_stats_update_begin(&stats->syncp);
4238 stats->msdu[rx->seqno_idx]++;
4239 stats->bytes += orig_len;
4240 u64_stats_update_end(&stats->syncp);
4242 if (fast_rx->internal_forward) {
4243 struct sk_buff *xmit_skb = NULL;
4244 if (is_multicast_ether_addr(addrs.da)) {
4245 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4246 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4247 sta_info_get(rx->sdata, addrs.da)) {
4254 * Send to wireless media and increase priority by 256
4255 * to keep the received priority instead of
4256 * reclassifying the frame (see cfg80211_classify8021d).
4258 xmit_skb->priority += 256;
4259 xmit_skb->protocol = htons(ETH_P_802_3);
4260 skb_reset_network_header(xmit_skb);
4261 skb_reset_mac_header(xmit_skb);
4262 dev_queue_xmit(xmit_skb);
4269 /* deliver to local stack */
4270 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4271 memset(skb->cb, 0, sizeof(skb->cb));
4273 napi_gro_receive(rx->napi, skb);
4275 netif_receive_skb(skb);
4285 * This function returns whether or not the SKB
4286 * was destined for RX processing or not, which,
4287 * if consume is true, is equivalent to whether
4288 * or not the skb was consumed.
4290 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4291 struct sk_buff *skb, bool consume)
4293 struct ieee80211_local *local = rx->local;
4294 struct ieee80211_sub_if_data *sdata = rx->sdata;
4298 /* See if we can do fast-rx; if we have to copy we already lost,
4299 * so punt in that case. We should never have to deliver a data
4300 * frame to multiple interfaces anyway.
4302 * We skip the ieee80211_accept_frame() call and do the necessary
4303 * checking inside ieee80211_invoke_fast_rx().
4305 if (consume && rx->sta) {
4306 struct ieee80211_fast_rx *fast_rx;
4308 fast_rx = rcu_dereference(rx->sta->fast_rx);
4309 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4313 if (!ieee80211_accept_frame(rx))
4317 skb = skb_copy(skb, GFP_ATOMIC);
4319 if (net_ratelimit())
4320 wiphy_debug(local->hw.wiphy,
4321 "failed to copy skb for %s\n",
4329 ieee80211_invoke_rx_handlers(rx);
4334 * This is the actual Rx frames handler. as it belongs to Rx path it must
4335 * be called with rcu_read_lock protection.
4337 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4338 struct ieee80211_sta *pubsta,
4339 struct sk_buff *skb,
4340 struct napi_struct *napi)
4342 struct ieee80211_local *local = hw_to_local(hw);
4343 struct ieee80211_sub_if_data *sdata;
4344 struct ieee80211_hdr *hdr;
4346 struct ieee80211_rx_data rx;
4347 struct ieee80211_sub_if_data *prev;
4348 struct rhlist_head *tmp;
4351 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4352 memset(&rx, 0, sizeof(rx));
4357 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4358 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4360 if (ieee80211_is_mgmt(fc)) {
4361 /* drop frame if too short for header */
4362 if (skb->len < ieee80211_hdrlen(fc))
4365 err = skb_linearize(skb);
4367 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4375 hdr = (struct ieee80211_hdr *)skb->data;
4376 ieee80211_parse_qos(&rx);
4377 ieee80211_verify_alignment(&rx);
4379 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4380 ieee80211_is_beacon(hdr->frame_control)))
4381 ieee80211_scan_rx(local, skb);
4383 if (ieee80211_is_data(fc)) {
4384 struct sta_info *sta, *prev_sta;
4387 rx.sta = container_of(pubsta, struct sta_info, sta);
4388 rx.sdata = rx.sta->sdata;
4389 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4396 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4403 rx.sdata = prev_sta->sdata;
4404 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4411 rx.sdata = prev_sta->sdata;
4413 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4421 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4422 if (!ieee80211_sdata_running(sdata))
4425 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4426 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4430 * frame is destined for this interface, but if it's
4431 * not also for the previous one we handle that after
4432 * the loop to avoid copying the SKB once too much
4440 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4442 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4448 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4451 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4460 * This is the receive path handler. It is called by a low level driver when an
4461 * 802.11 MPDU is received from the hardware.
4463 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4464 struct sk_buff *skb, struct napi_struct *napi)
4466 struct ieee80211_local *local = hw_to_local(hw);
4467 struct ieee80211_rate *rate = NULL;
4468 struct ieee80211_supported_band *sband;
4469 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4471 WARN_ON_ONCE(softirq_count() == 0);
4473 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4476 sband = local->hw.wiphy->bands[status->band];
4477 if (WARN_ON(!sband))
4481 * If we're suspending, it is possible although not too likely
4482 * that we'd be receiving frames after having already partially
4483 * quiesced the stack. We can't process such frames then since
4484 * that might, for example, cause stations to be added or other
4485 * driver callbacks be invoked.
4487 if (unlikely(local->quiescing || local->suspended))
4490 /* We might be during a HW reconfig, prevent Rx for the same reason */
4491 if (unlikely(local->in_reconfig))
4495 * The same happens when we're not even started,
4496 * but that's worth a warning.
4498 if (WARN_ON(!local->started))
4501 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4503 * Validate the rate, unless a PLCP error means that
4504 * we probably can't have a valid rate here anyway.
4507 switch (status->encoding) {
4510 * rate_idx is MCS index, which can be [0-76]
4513 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4515 * Anything else would be some sort of driver or
4516 * hardware error. The driver should catch hardware
4519 if (WARN(status->rate_idx > 76,
4520 "Rate marked as an HT rate but passed "
4521 "status->rate_idx is not "
4522 "an MCS index [0-76]: %d (0x%02x)\n",
4528 if (WARN_ONCE(status->rate_idx > 9 ||
4531 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4532 status->rate_idx, status->nss))
4536 if (WARN_ONCE(status->rate_idx > 11 ||
4539 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4540 status->rate_idx, status->nss))
4547 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4549 rate = &sband->bitrates[status->rate_idx];
4553 status->rx_flags = 0;
4556 * key references and virtual interfaces are protected using RCU
4557 * and this requires that we are in a read-side RCU section during
4558 * receive processing
4563 * Frames with failed FCS/PLCP checksum are not returned,
4564 * all other frames are returned without radiotap header
4565 * if it was previously present.
4566 * Also, frames with less than 16 bytes are dropped.
4568 skb = ieee80211_rx_monitor(local, skb, rate);
4574 ieee80211_tpt_led_trig_rx(local,
4575 ((struct ieee80211_hdr *)skb->data)->frame_control,
4578 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4586 EXPORT_SYMBOL(ieee80211_rx_napi);
4588 /* This is a version of the rx handler that can be called from hard irq
4589 * context. Post the skb on the queue and schedule the tasklet */
4590 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4592 struct ieee80211_local *local = hw_to_local(hw);
4594 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4596 skb->pkt_type = IEEE80211_RX_MSG;
4597 skb_queue_tail(&local->skb_queue, skb);
4598 tasklet_schedule(&local->tasklet);
4600 EXPORT_SYMBOL(ieee80211_rx_irqsafe);