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))
121 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
124 if (ieee80211_is_ctl(hdr->frame_control) &&
125 !ieee80211_is_pspoll(hdr->frame_control) &&
126 !ieee80211_is_back_req(hdr->frame_control))
133 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
134 struct ieee80211_rx_status *status,
139 /* always present fields */
140 len = sizeof(struct ieee80211_radiotap_header) + 8;
142 /* allocate extra bitmaps */
144 len += 4 * hweight8(status->chains);
146 if (ieee80211_have_rx_timestamp(status)) {
150 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
153 /* antenna field, if we don't have per-chain info */
157 /* padding for RX_FLAGS if necessary */
160 if (status->encoding == RX_ENC_HT) /* HT info */
163 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
168 if (status->encoding == RX_ENC_VHT) {
173 if (local->hw.radiotap_timestamp.units_pos >= 0) {
178 if (status->chains) {
179 /* antenna and antenna signal fields */
180 len += 2 * hweight8(status->chains);
183 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
184 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
186 /* vendor presence bitmap */
188 /* alignment for fixed 6-byte vendor data header */
190 /* vendor data header */
192 if (WARN_ON(rtap->align == 0))
194 len = ALIGN(len, rtap->align);
195 len += rtap->len + rtap->pad;
201 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
206 struct ieee80211_hdr_3addr hdr;
214 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
216 if (skb->len < rtap_space + sizeof(action) +
217 VHT_MUMIMO_GROUPS_DATA_LEN)
220 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
223 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
225 if (!ieee80211_is_action(action.hdr.frame_control))
228 if (action.category != WLAN_CATEGORY_VHT)
231 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
234 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
237 skb = skb_copy(skb, GFP_ATOMIC);
241 skb_queue_tail(&sdata->skb_queue, skb);
242 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
246 * ieee80211_add_rx_radiotap_header - add radiotap header
248 * add a radiotap header containing all the fields which the hardware provided.
251 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
253 struct ieee80211_rate *rate,
254 int rtap_len, bool has_fcs)
256 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
257 struct ieee80211_radiotap_header *rthdr;
262 u16 channel_flags = 0;
264 unsigned long chains = status->chains;
265 struct ieee80211_vendor_radiotap rtap = {};
267 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
268 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
269 /* rtap.len and rtap.pad are undone immediately */
270 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
274 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
277 rthdr = skb_push(skb, rtap_len);
278 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
279 it_present = &rthdr->it_present;
281 /* radiotap header, set always present flags */
282 rthdr->it_len = cpu_to_le16(rtap_len);
283 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
284 BIT(IEEE80211_RADIOTAP_CHANNEL) |
285 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
288 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
290 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
292 BIT(IEEE80211_RADIOTAP_EXT) |
293 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
294 put_unaligned_le32(it_present_val, it_present);
296 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
297 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
300 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
301 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
302 BIT(IEEE80211_RADIOTAP_EXT);
303 put_unaligned_le32(it_present_val, it_present);
305 it_present_val = rtap.present;
308 put_unaligned_le32(it_present_val, it_present);
310 pos = (void *)(it_present + 1);
312 /* the order of the following fields is important */
314 /* IEEE80211_RADIOTAP_TSFT */
315 if (ieee80211_have_rx_timestamp(status)) {
317 while ((pos - (u8 *)rthdr) & 7)
320 ieee80211_calculate_rx_timestamp(local, status,
323 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
327 /* IEEE80211_RADIOTAP_FLAGS */
328 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
329 *pos |= IEEE80211_RADIOTAP_F_FCS;
330 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
331 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
332 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
333 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
336 /* IEEE80211_RADIOTAP_RATE */
337 if (!rate || status->encoding != RX_ENC_LEGACY) {
339 * Without rate information don't add it. If we have,
340 * MCS information is a separate field in radiotap,
341 * added below. The byte here is needed as padding
342 * for the channel though, so initialise it to 0.
347 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
348 if (status->bw == RATE_INFO_BW_10)
350 else if (status->bw == RATE_INFO_BW_5)
352 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
356 /* IEEE80211_RADIOTAP_CHANNEL */
357 put_unaligned_le16(status->freq, pos);
359 if (status->bw == RATE_INFO_BW_10)
360 channel_flags |= IEEE80211_CHAN_HALF;
361 else if (status->bw == RATE_INFO_BW_5)
362 channel_flags |= IEEE80211_CHAN_QUARTER;
364 if (status->band == NL80211_BAND_5GHZ)
365 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
366 else if (status->encoding != RX_ENC_LEGACY)
367 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
368 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
369 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
371 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
373 channel_flags |= IEEE80211_CHAN_2GHZ;
374 put_unaligned_le16(channel_flags, pos);
377 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
378 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
379 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
380 *pos = status->signal;
382 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
386 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
388 if (!status->chains) {
389 /* IEEE80211_RADIOTAP_ANTENNA */
390 *pos = status->antenna;
394 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
396 /* IEEE80211_RADIOTAP_RX_FLAGS */
397 /* ensure 2 byte alignment for the 2 byte field as required */
398 if ((pos - (u8 *)rthdr) & 1)
400 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
401 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
402 put_unaligned_le16(rx_flags, pos);
405 if (status->encoding == RX_ENC_HT) {
408 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
409 *pos++ = local->hw.radiotap_mcs_details;
411 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
412 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
413 if (status->bw == RATE_INFO_BW_40)
414 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
415 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
416 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
417 if (status->enc_flags & RX_ENC_FLAG_LDPC)
418 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
419 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
420 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
422 *pos++ = status->rate_idx;
425 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
428 /* ensure 4 byte alignment */
429 while ((pos - (u8 *)rthdr) & 3)
432 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
433 put_unaligned_le32(status->ampdu_reference, pos);
435 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
436 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
437 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
438 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
439 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
440 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
441 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
442 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
443 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
444 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
445 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
446 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
447 put_unaligned_le16(flags, pos);
449 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
450 *pos++ = status->ampdu_delimiter_crc;
456 if (status->encoding == RX_ENC_VHT) {
457 u16 known = local->hw.radiotap_vht_details;
459 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
460 put_unaligned_le16(known, pos);
463 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
464 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
465 /* in VHT, STBC is binary */
466 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
467 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
468 if (status->enc_flags & RX_ENC_FLAG_BF)
469 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
472 switch (status->bw) {
473 case RATE_INFO_BW_80:
476 case RATE_INFO_BW_160:
479 case RATE_INFO_BW_40:
486 *pos = (status->rate_idx << 4) | status->nss;
489 if (status->enc_flags & RX_ENC_FLAG_LDPC)
490 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
498 if (local->hw.radiotap_timestamp.units_pos >= 0) {
500 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
503 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
505 /* ensure 8 byte alignment */
506 while ((pos - (u8 *)rthdr) & 7)
509 put_unaligned_le64(status->device_timestamp, pos);
512 if (local->hw.radiotap_timestamp.accuracy >= 0) {
513 accuracy = local->hw.radiotap_timestamp.accuracy;
514 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
516 put_unaligned_le16(accuracy, pos);
519 *pos++ = local->hw.radiotap_timestamp.units_pos;
523 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
524 *pos++ = status->chain_signal[chain];
528 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
529 /* ensure 2 byte alignment for the vendor field as required */
530 if ((pos - (u8 *)rthdr) & 1)
532 *pos++ = rtap.oui[0];
533 *pos++ = rtap.oui[1];
534 *pos++ = rtap.oui[2];
536 put_unaligned_le16(rtap.len, pos);
538 /* align the actual payload as requested */
539 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
541 /* data (and possible padding) already follows */
545 static struct sk_buff *
546 ieee80211_make_monitor_skb(struct ieee80211_local *local,
547 struct sk_buff **origskb,
548 struct ieee80211_rate *rate,
549 int rtap_space, bool use_origskb)
551 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
552 int rt_hdrlen, needed_headroom;
555 /* room for the radiotap header based on driver features */
556 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
557 needed_headroom = rt_hdrlen - rtap_space;
560 /* only need to expand headroom if necessary */
565 * This shouldn't trigger often because most devices have an
566 * RX header they pull before we get here, and that should
567 * be big enough for our radiotap information. We should
568 * probably export the length to drivers so that we can have
569 * them allocate enough headroom to start with.
571 if (skb_headroom(skb) < needed_headroom &&
572 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
578 * Need to make a copy and possibly remove radiotap header
579 * and FCS from the original.
581 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
587 /* prepend radiotap information */
588 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
590 skb_reset_mac_header(skb);
591 skb->ip_summed = CHECKSUM_UNNECESSARY;
592 skb->pkt_type = PACKET_OTHERHOST;
593 skb->protocol = htons(ETH_P_802_2);
599 * This function copies a received frame to all monitor interfaces and
600 * returns a cleaned-up SKB that no longer includes the FCS nor the
601 * radiotap header the driver might have added.
603 static struct sk_buff *
604 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
605 struct ieee80211_rate *rate)
607 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
608 struct ieee80211_sub_if_data *sdata;
609 struct sk_buff *monskb = NULL;
610 int present_fcs_len = 0;
611 unsigned int rtap_space = 0;
612 struct ieee80211_sub_if_data *monitor_sdata =
613 rcu_dereference(local->monitor_sdata);
614 bool only_monitor = false;
616 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
617 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
619 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
623 * First, we may need to make a copy of the skb because
624 * (1) we need to modify it for radiotap (if not present), and
625 * (2) the other RX handlers will modify the skb we got.
627 * We don't need to, of course, if we aren't going to return
628 * the SKB because it has a bad FCS/PLCP checksum.
631 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
632 if (unlikely(origskb->len <= FCS_LEN)) {
635 dev_kfree_skb(origskb);
638 present_fcs_len = FCS_LEN;
641 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
642 if (!pskb_may_pull(origskb, 2 + rtap_space)) {
643 dev_kfree_skb(origskb);
647 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
649 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
651 dev_kfree_skb(origskb);
655 remove_monitor_info(origskb, present_fcs_len, rtap_space);
659 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
661 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
662 bool last_monitor = list_is_last(&sdata->u.mntr.list,
666 monskb = ieee80211_make_monitor_skb(local, &origskb,
678 skb = skb_clone(monskb, GFP_ATOMIC);
682 skb->dev = sdata->dev;
683 ieee80211_rx_stats(skb->dev, skb->len);
684 netif_receive_skb(skb);
692 /* this happens if last_monitor was erroneously false */
693 dev_kfree_skb(monskb);
699 remove_monitor_info(origskb, present_fcs_len, rtap_space);
703 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
705 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
706 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
707 int tid, seqno_idx, security_idx;
709 /* does the frame have a qos control field? */
710 if (ieee80211_is_data_qos(hdr->frame_control)) {
711 u8 *qc = ieee80211_get_qos_ctl(hdr);
712 /* frame has qos control */
713 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
714 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
715 status->rx_flags |= IEEE80211_RX_AMSDU;
721 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
723 * Sequence numbers for management frames, QoS data
724 * frames with a broadcast/multicast address in the
725 * Address 1 field, and all non-QoS data frames sent
726 * by QoS STAs are assigned using an additional single
727 * modulo-4096 counter, [...]
729 * We also use that counter for non-QoS STAs.
731 seqno_idx = IEEE80211_NUM_TIDS;
733 if (ieee80211_is_mgmt(hdr->frame_control))
734 security_idx = IEEE80211_NUM_TIDS;
738 rx->seqno_idx = seqno_idx;
739 rx->security_idx = security_idx;
740 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
741 * For now, set skb->priority to 0 for other cases. */
742 rx->skb->priority = (tid > 7) ? 0 : tid;
746 * DOC: Packet alignment
748 * Drivers always need to pass packets that are aligned to two-byte boundaries
751 * Additionally, should, if possible, align the payload data in a way that
752 * guarantees that the contained IP header is aligned to a four-byte
753 * boundary. In the case of regular frames, this simply means aligning the
754 * payload to a four-byte boundary (because either the IP header is directly
755 * contained, or IV/RFC1042 headers that have a length divisible by four are
756 * in front of it). If the payload data is not properly aligned and the
757 * architecture doesn't support efficient unaligned operations, mac80211
758 * will align the data.
760 * With A-MSDU frames, however, the payload data address must yield two modulo
761 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
762 * push the IP header further back to a multiple of four again. Thankfully, the
763 * specs were sane enough this time around to require padding each A-MSDU
764 * subframe to a length that is a multiple of four.
766 * Padding like Atheros hardware adds which is between the 802.11 header and
767 * the payload is not supported, the driver is required to move the 802.11
768 * header to be directly in front of the payload in that case.
770 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
772 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
773 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
780 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
782 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
784 if (is_multicast_ether_addr(hdr->addr1))
787 return ieee80211_is_robust_mgmt_frame(skb);
791 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
793 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
795 if (!is_multicast_ether_addr(hdr->addr1))
798 return ieee80211_is_robust_mgmt_frame(skb);
802 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
803 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
805 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
806 struct ieee80211_mmie *mmie;
807 struct ieee80211_mmie_16 *mmie16;
809 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
812 if (!ieee80211_is_robust_mgmt_frame(skb))
813 return -1; /* not a robust management frame */
815 mmie = (struct ieee80211_mmie *)
816 (skb->data + skb->len - sizeof(*mmie));
817 if (mmie->element_id == WLAN_EID_MMIE &&
818 mmie->length == sizeof(*mmie) - 2)
819 return le16_to_cpu(mmie->key_id);
821 mmie16 = (struct ieee80211_mmie_16 *)
822 (skb->data + skb->len - sizeof(*mmie16));
823 if (skb->len >= 24 + sizeof(*mmie16) &&
824 mmie16->element_id == WLAN_EID_MMIE &&
825 mmie16->length == sizeof(*mmie16) - 2)
826 return le16_to_cpu(mmie16->key_id);
831 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
834 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
839 fc = hdr->frame_control;
840 hdrlen = ieee80211_hdrlen(fc);
842 if (skb->len < hdrlen + cs->hdr_len)
845 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
846 keyid &= cs->key_idx_mask;
847 keyid >>= cs->key_idx_shift;
852 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
854 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
855 char *dev_addr = rx->sdata->vif.addr;
857 if (ieee80211_is_data(hdr->frame_control)) {
858 if (is_multicast_ether_addr(hdr->addr1)) {
859 if (ieee80211_has_tods(hdr->frame_control) ||
860 !ieee80211_has_fromds(hdr->frame_control))
861 return RX_DROP_MONITOR;
862 if (ether_addr_equal(hdr->addr3, dev_addr))
863 return RX_DROP_MONITOR;
865 if (!ieee80211_has_a4(hdr->frame_control))
866 return RX_DROP_MONITOR;
867 if (ether_addr_equal(hdr->addr4, dev_addr))
868 return RX_DROP_MONITOR;
872 /* If there is not an established peer link and this is not a peer link
873 * establisment frame, beacon or probe, drop the frame.
876 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
877 struct ieee80211_mgmt *mgmt;
879 if (!ieee80211_is_mgmt(hdr->frame_control))
880 return RX_DROP_MONITOR;
882 if (ieee80211_is_action(hdr->frame_control)) {
885 /* make sure category field is present */
886 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
887 return RX_DROP_MONITOR;
889 mgmt = (struct ieee80211_mgmt *)hdr;
890 category = mgmt->u.action.category;
891 if (category != WLAN_CATEGORY_MESH_ACTION &&
892 category != WLAN_CATEGORY_SELF_PROTECTED)
893 return RX_DROP_MONITOR;
897 if (ieee80211_is_probe_req(hdr->frame_control) ||
898 ieee80211_is_probe_resp(hdr->frame_control) ||
899 ieee80211_is_beacon(hdr->frame_control) ||
900 ieee80211_is_auth(hdr->frame_control))
903 return RX_DROP_MONITOR;
909 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
912 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
913 struct sk_buff *tail = skb_peek_tail(frames);
914 struct ieee80211_rx_status *status;
916 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
922 status = IEEE80211_SKB_RXCB(tail);
923 if (status->flag & RX_FLAG_AMSDU_MORE)
929 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
930 struct tid_ampdu_rx *tid_agg_rx,
932 struct sk_buff_head *frames)
934 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
936 struct ieee80211_rx_status *status;
938 lockdep_assert_held(&tid_agg_rx->reorder_lock);
940 if (skb_queue_empty(skb_list))
943 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
944 __skb_queue_purge(skb_list);
948 /* release frames from the reorder ring buffer */
949 tid_agg_rx->stored_mpdu_num--;
950 while ((skb = __skb_dequeue(skb_list))) {
951 status = IEEE80211_SKB_RXCB(skb);
952 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
953 __skb_queue_tail(frames, skb);
957 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
958 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
961 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
962 struct tid_ampdu_rx *tid_agg_rx,
964 struct sk_buff_head *frames)
968 lockdep_assert_held(&tid_agg_rx->reorder_lock);
970 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
971 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
972 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
978 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
979 * the skb was added to the buffer longer than this time ago, the earlier
980 * frames that have not yet been received are assumed to be lost and the skb
981 * can be released for processing. This may also release other skb's from the
982 * reorder buffer if there are no additional gaps between the frames.
984 * Callers must hold tid_agg_rx->reorder_lock.
986 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
988 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
989 struct tid_ampdu_rx *tid_agg_rx,
990 struct sk_buff_head *frames)
994 lockdep_assert_held(&tid_agg_rx->reorder_lock);
996 /* release the buffer until next missing frame */
997 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
998 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
999 tid_agg_rx->stored_mpdu_num) {
1001 * No buffers ready to be released, but check whether any
1002 * frames in the reorder buffer have timed out.
1005 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1006 j = (j + 1) % tid_agg_rx->buf_size) {
1007 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1012 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1013 HT_RX_REORDER_BUF_TIMEOUT))
1014 goto set_release_timer;
1016 /* don't leave incomplete A-MSDUs around */
1017 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1018 i = (i + 1) % tid_agg_rx->buf_size)
1019 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1021 ht_dbg_ratelimited(sdata,
1022 "release an RX reorder frame due to timeout on earlier frames\n");
1023 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1027 * Increment the head seq# also for the skipped slots.
1029 tid_agg_rx->head_seq_num =
1030 (tid_agg_rx->head_seq_num +
1031 skipped) & IEEE80211_SN_MASK;
1034 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1035 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1037 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1040 if (tid_agg_rx->stored_mpdu_num) {
1041 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1043 for (; j != (index - 1) % tid_agg_rx->buf_size;
1044 j = (j + 1) % tid_agg_rx->buf_size) {
1045 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1051 if (!tid_agg_rx->removed)
1052 mod_timer(&tid_agg_rx->reorder_timer,
1053 tid_agg_rx->reorder_time[j] + 1 +
1054 HT_RX_REORDER_BUF_TIMEOUT);
1056 del_timer(&tid_agg_rx->reorder_timer);
1061 * As this function belongs to the RX path it must be under
1062 * rcu_read_lock protection. It returns false if the frame
1063 * can be processed immediately, true if it was consumed.
1065 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1066 struct tid_ampdu_rx *tid_agg_rx,
1067 struct sk_buff *skb,
1068 struct sk_buff_head *frames)
1070 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1071 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1072 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1073 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1074 u16 head_seq_num, buf_size;
1078 spin_lock(&tid_agg_rx->reorder_lock);
1081 * Offloaded BA sessions have no known starting sequence number so pick
1082 * one from first Rxed frame for this tid after BA was started.
1084 if (unlikely(tid_agg_rx->auto_seq)) {
1085 tid_agg_rx->auto_seq = false;
1086 tid_agg_rx->ssn = mpdu_seq_num;
1087 tid_agg_rx->head_seq_num = mpdu_seq_num;
1090 buf_size = tid_agg_rx->buf_size;
1091 head_seq_num = tid_agg_rx->head_seq_num;
1094 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1097 if (unlikely(!tid_agg_rx->started)) {
1098 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1102 tid_agg_rx->started = true;
1105 /* frame with out of date sequence number */
1106 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1112 * If frame the sequence number exceeds our buffering window
1113 * size release some previous frames to make room for this one.
1115 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1116 head_seq_num = ieee80211_sn_inc(
1117 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1118 /* release stored frames up to new head to stack */
1119 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1120 head_seq_num, frames);
1123 /* Now the new frame is always in the range of the reordering buffer */
1125 index = mpdu_seq_num % tid_agg_rx->buf_size;
1127 /* check if we already stored this frame */
1128 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1134 * If the current MPDU is in the right order and nothing else
1135 * is stored we can process it directly, no need to buffer it.
1136 * If it is first but there's something stored, we may be able
1137 * to release frames after this one.
1139 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1140 tid_agg_rx->stored_mpdu_num == 0) {
1141 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1142 tid_agg_rx->head_seq_num =
1143 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1148 /* put the frame in the reordering buffer */
1149 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1150 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1151 tid_agg_rx->reorder_time[index] = jiffies;
1152 tid_agg_rx->stored_mpdu_num++;
1153 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1157 spin_unlock(&tid_agg_rx->reorder_lock);
1162 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1163 * true if the MPDU was buffered, false if it should be processed.
1165 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1166 struct sk_buff_head *frames)
1168 struct sk_buff *skb = rx->skb;
1169 struct ieee80211_local *local = rx->local;
1170 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1171 struct sta_info *sta = rx->sta;
1172 struct tid_ampdu_rx *tid_agg_rx;
1176 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1177 is_multicast_ether_addr(hdr->addr1))
1181 * filter the QoS data rx stream according to
1182 * STA/TID and check if this STA/TID is on aggregation
1188 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1189 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1190 tid = ieee80211_get_tid(hdr);
1192 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1194 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1195 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1196 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1197 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1198 WLAN_BACK_RECIPIENT,
1199 WLAN_REASON_QSTA_REQUIRE_SETUP);
1203 /* qos null data frames are excluded */
1204 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1207 /* not part of a BA session */
1208 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1209 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1212 /* new, potentially un-ordered, ampdu frame - process it */
1214 /* reset session timer */
1215 if (tid_agg_rx->timeout)
1216 tid_agg_rx->last_rx = jiffies;
1218 /* if this mpdu is fragmented - terminate rx aggregation session */
1219 sc = le16_to_cpu(hdr->seq_ctrl);
1220 if (sc & IEEE80211_SCTL_FRAG) {
1221 skb_queue_tail(&rx->sdata->skb_queue, skb);
1222 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1227 * No locking needed -- we will only ever process one
1228 * RX packet at a time, and thus own tid_agg_rx. All
1229 * other code manipulating it needs to (and does) make
1230 * sure that we cannot get to it any more before doing
1233 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1238 __skb_queue_tail(frames, skb);
1241 static ieee80211_rx_result debug_noinline
1242 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1245 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1247 if (status->flag & RX_FLAG_DUP_VALIDATED)
1251 * Drop duplicate 802.11 retransmissions
1252 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1255 if (rx->skb->len < 24)
1258 if (ieee80211_is_ctl(hdr->frame_control) ||
1259 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1260 is_multicast_ether_addr(hdr->addr1))
1266 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1267 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1268 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1269 rx->sta->rx_stats.num_duplicates++;
1270 return RX_DROP_UNUSABLE;
1271 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1272 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1278 static ieee80211_rx_result debug_noinline
1279 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1281 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1283 /* Drop disallowed frame classes based on STA auth/assoc state;
1284 * IEEE 802.11, Chap 5.5.
1286 * mac80211 filters only based on association state, i.e. it drops
1287 * Class 3 frames from not associated stations. hostapd sends
1288 * deauth/disassoc frames when needed. In addition, hostapd is
1289 * responsible for filtering on both auth and assoc states.
1292 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1293 return ieee80211_rx_mesh_check(rx);
1295 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1296 ieee80211_is_pspoll(hdr->frame_control)) &&
1297 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1298 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1299 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1300 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1302 * accept port control frames from the AP even when it's not
1303 * yet marked ASSOC to prevent a race where we don't set the
1304 * assoc bit quickly enough before it sends the first frame
1306 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1307 ieee80211_is_data_present(hdr->frame_control)) {
1308 unsigned int hdrlen;
1311 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1313 if (rx->skb->len < hdrlen + 8)
1314 return RX_DROP_MONITOR;
1316 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1317 if (ethertype == rx->sdata->control_port_protocol)
1321 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1322 cfg80211_rx_spurious_frame(rx->sdata->dev,
1325 return RX_DROP_UNUSABLE;
1327 return RX_DROP_MONITOR;
1334 static ieee80211_rx_result debug_noinline
1335 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1337 struct ieee80211_local *local;
1338 struct ieee80211_hdr *hdr;
1339 struct sk_buff *skb;
1343 hdr = (struct ieee80211_hdr *) skb->data;
1345 if (!local->pspolling)
1348 if (!ieee80211_has_fromds(hdr->frame_control))
1349 /* this is not from AP */
1352 if (!ieee80211_is_data(hdr->frame_control))
1355 if (!ieee80211_has_moredata(hdr->frame_control)) {
1356 /* AP has no more frames buffered for us */
1357 local->pspolling = false;
1361 /* more data bit is set, let's request a new frame from the AP */
1362 ieee80211_send_pspoll(local, rx->sdata);
1367 static void sta_ps_start(struct sta_info *sta)
1369 struct ieee80211_sub_if_data *sdata = sta->sdata;
1370 struct ieee80211_local *local = sdata->local;
1374 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1375 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1376 ps = &sdata->bss->ps;
1380 atomic_inc(&ps->num_sta_ps);
1381 set_sta_flag(sta, WLAN_STA_PS_STA);
1382 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1383 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1384 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1385 sta->sta.addr, sta->sta.aid);
1387 ieee80211_clear_fast_xmit(sta);
1389 if (!sta->sta.txq[0])
1392 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1393 if (txq_has_queue(sta->sta.txq[tid]))
1394 set_bit(tid, &sta->txq_buffered_tids);
1396 clear_bit(tid, &sta->txq_buffered_tids);
1400 static void sta_ps_end(struct sta_info *sta)
1402 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1403 sta->sta.addr, sta->sta.aid);
1405 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1407 * Clear the flag only if the other one is still set
1408 * so that the TX path won't start TX'ing new frames
1409 * directly ... In the case that the driver flag isn't
1410 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1412 clear_sta_flag(sta, WLAN_STA_PS_STA);
1413 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1414 sta->sta.addr, sta->sta.aid);
1418 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1419 clear_sta_flag(sta, WLAN_STA_PS_STA);
1420 ieee80211_sta_ps_deliver_wakeup(sta);
1423 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1425 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1428 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1430 /* Don't let the same PS state be set twice */
1431 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1432 if ((start && in_ps) || (!start && !in_ps))
1442 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1444 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1446 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1448 if (test_sta_flag(sta, WLAN_STA_SP))
1451 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1452 ieee80211_sta_ps_deliver_poll_response(sta);
1454 set_sta_flag(sta, WLAN_STA_PSPOLL);
1456 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1458 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1460 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1461 int ac = ieee80211_ac_from_tid(tid);
1464 * If this AC is not trigger-enabled do nothing unless the
1465 * driver is calling us after it already checked.
1467 * NB: This could/should check a separate bitmap of trigger-
1468 * enabled queues, but for now we only implement uAPSD w/o
1469 * TSPEC changes to the ACs, so they're always the same.
1471 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1472 tid != IEEE80211_NUM_TIDS)
1475 /* if we are in a service period, do nothing */
1476 if (test_sta_flag(sta, WLAN_STA_SP))
1479 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1480 ieee80211_sta_ps_deliver_uapsd(sta);
1482 set_sta_flag(sta, WLAN_STA_UAPSD);
1484 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1486 static ieee80211_rx_result debug_noinline
1487 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1489 struct ieee80211_sub_if_data *sdata = rx->sdata;
1490 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1491 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1496 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1497 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1501 * The device handles station powersave, so don't do anything about
1502 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1503 * it to mac80211 since they're handled.)
1505 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1509 * Don't do anything if the station isn't already asleep. In
1510 * the uAPSD case, the station will probably be marked asleep,
1511 * in the PS-Poll case the station must be confused ...
1513 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1516 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1517 ieee80211_sta_pspoll(&rx->sta->sta);
1519 /* Free PS Poll skb here instead of returning RX_DROP that would
1520 * count as an dropped frame. */
1521 dev_kfree_skb(rx->skb);
1524 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1525 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1526 ieee80211_has_pm(hdr->frame_control) &&
1527 (ieee80211_is_data_qos(hdr->frame_control) ||
1528 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1529 u8 tid = ieee80211_get_tid(hdr);
1531 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1537 static ieee80211_rx_result debug_noinline
1538 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1540 struct sta_info *sta = rx->sta;
1541 struct sk_buff *skb = rx->skb;
1542 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1550 * Update last_rx only for IBSS packets which are for the current
1551 * BSSID and for station already AUTHORIZED to avoid keeping the
1552 * current IBSS network alive in cases where other STAs start
1553 * using different BSSID. This will also give the station another
1554 * chance to restart the authentication/authorization in case
1555 * something went wrong the first time.
1557 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1558 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1559 NL80211_IFTYPE_ADHOC);
1560 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1561 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1562 sta->rx_stats.last_rx = jiffies;
1563 if (ieee80211_is_data(hdr->frame_control) &&
1564 !is_multicast_ether_addr(hdr->addr1))
1565 sta->rx_stats.last_rate =
1566 sta_stats_encode_rate(status);
1568 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1569 sta->rx_stats.last_rx = jiffies;
1570 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1572 * Mesh beacons will update last_rx when if they are found to
1573 * match the current local configuration when processed.
1575 sta->rx_stats.last_rx = jiffies;
1576 if (ieee80211_is_data(hdr->frame_control))
1577 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1580 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1581 ieee80211_sta_rx_notify(rx->sdata, hdr);
1583 sta->rx_stats.fragments++;
1585 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1586 sta->rx_stats.bytes += rx->skb->len;
1587 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1589 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1590 sta->rx_stats.last_signal = status->signal;
1591 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1594 if (status->chains) {
1595 sta->rx_stats.chains = status->chains;
1596 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1597 int signal = status->chain_signal[i];
1599 if (!(status->chains & BIT(i)))
1602 sta->rx_stats.chain_signal_last[i] = signal;
1603 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1609 * Change STA power saving mode only at the end of a frame
1610 * exchange sequence, and only for a data or management
1611 * frame as specified in IEEE 802.11-2016 11.2.3.2
1613 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1614 !ieee80211_has_morefrags(hdr->frame_control) &&
1615 (ieee80211_is_mgmt(hdr->frame_control) ||
1616 ieee80211_is_data(hdr->frame_control)) &&
1617 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1618 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1619 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1620 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1621 if (!ieee80211_has_pm(hdr->frame_control))
1624 if (ieee80211_has_pm(hdr->frame_control))
1629 /* mesh power save support */
1630 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1631 ieee80211_mps_rx_h_sta_process(sta, hdr);
1634 * Drop (qos-)data::nullfunc frames silently, since they
1635 * are used only to control station power saving mode.
1637 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1638 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1639 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1642 * If we receive a 4-addr nullfunc frame from a STA
1643 * that was not moved to a 4-addr STA vlan yet send
1644 * the event to userspace and for older hostapd drop
1645 * the frame to the monitor interface.
1647 if (ieee80211_has_a4(hdr->frame_control) &&
1648 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1649 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1650 !rx->sdata->u.vlan.sta))) {
1651 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1652 cfg80211_rx_unexpected_4addr_frame(
1653 rx->sdata->dev, sta->sta.addr,
1655 return RX_DROP_MONITOR;
1658 * Update counter and free packet here to avoid
1659 * counting this as a dropped packed.
1661 sta->rx_stats.packets++;
1662 dev_kfree_skb(rx->skb);
1667 } /* ieee80211_rx_h_sta_process */
1669 static ieee80211_rx_result debug_noinline
1670 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1672 struct sk_buff *skb = rx->skb;
1673 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1677 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1678 struct ieee80211_key *sta_ptk = NULL;
1679 int mmie_keyidx = -1;
1681 const struct ieee80211_cipher_scheme *cs = NULL;
1686 * There are four types of keys:
1687 * - GTK (group keys)
1688 * - IGTK (group keys for management frames)
1689 * - PTK (pairwise keys)
1690 * - STK (station-to-station pairwise keys)
1692 * When selecting a key, we have to distinguish between multicast
1693 * (including broadcast) and unicast frames, the latter can only
1694 * use PTKs and STKs while the former always use GTKs and IGTKs.
1695 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1696 * unicast frames can also use key indices like GTKs. Hence, if we
1697 * don't have a PTK/STK we check the key index for a WEP key.
1699 * Note that in a regular BSS, multicast frames are sent by the
1700 * AP only, associated stations unicast the frame to the AP first
1701 * which then multicasts it on their behalf.
1703 * There is also a slight problem in IBSS mode: GTKs are negotiated
1704 * with each station, that is something we don't currently handle.
1705 * The spec seems to expect that one negotiates the same key with
1706 * every station but there's no such requirement; VLANs could be
1710 /* start without a key */
1712 fc = hdr->frame_control;
1715 int keyid = rx->sta->ptk_idx;
1717 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1718 cs = rx->sta->cipher_scheme;
1719 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1720 if (unlikely(keyid < 0))
1721 return RX_DROP_UNUSABLE;
1723 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1726 if (!ieee80211_has_protected(fc))
1727 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1729 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1731 if ((status->flag & RX_FLAG_DECRYPTED) &&
1732 (status->flag & RX_FLAG_IV_STRIPPED))
1734 /* Skip decryption if the frame is not protected. */
1735 if (!ieee80211_has_protected(fc))
1737 } else if (mmie_keyidx >= 0) {
1738 /* Broadcast/multicast robust management frame / BIP */
1739 if ((status->flag & RX_FLAG_DECRYPTED) &&
1740 (status->flag & RX_FLAG_IV_STRIPPED))
1743 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1744 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1745 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1747 if (ieee80211_is_group_privacy_action(skb) &&
1748 test_sta_flag(rx->sta, WLAN_STA_MFP))
1749 return RX_DROP_MONITOR;
1751 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1754 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1755 } else if (!ieee80211_has_protected(fc)) {
1757 * The frame was not protected, so skip decryption. However, we
1758 * need to set rx->key if there is a key that could have been
1759 * used so that the frame may be dropped if encryption would
1760 * have been expected.
1762 struct ieee80211_key *key = NULL;
1763 struct ieee80211_sub_if_data *sdata = rx->sdata;
1766 if (ieee80211_is_mgmt(fc) &&
1767 is_multicast_ether_addr(hdr->addr1) &&
1768 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1772 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1773 key = rcu_dereference(rx->sta->gtk[i]);
1779 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1780 key = rcu_dereference(sdata->keys[i]);
1793 * The device doesn't give us the IV so we won't be
1794 * able to look up the key. That's ok though, we
1795 * don't need to decrypt the frame, we just won't
1796 * be able to keep statistics accurate.
1797 * Except for key threshold notifications, should
1798 * we somehow allow the driver to tell us which key
1799 * the hardware used if this flag is set?
1801 if ((status->flag & RX_FLAG_DECRYPTED) &&
1802 (status->flag & RX_FLAG_IV_STRIPPED))
1805 hdrlen = ieee80211_hdrlen(fc);
1808 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1810 if (unlikely(keyidx < 0))
1811 return RX_DROP_UNUSABLE;
1813 if (rx->skb->len < 8 + hdrlen)
1814 return RX_DROP_UNUSABLE; /* TODO: count this? */
1816 * no need to call ieee80211_wep_get_keyidx,
1817 * it verifies a bunch of things we've done already
1819 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1820 keyidx = keyid >> 6;
1823 /* check per-station GTK first, if multicast packet */
1824 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1825 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1827 /* if not found, try default key */
1829 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1832 * RSNA-protected unicast frames should always be
1833 * sent with pairwise or station-to-station keys,
1834 * but for WEP we allow using a key index as well.
1837 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1838 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1839 !is_multicast_ether_addr(hdr->addr1))
1845 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1846 return RX_DROP_MONITOR;
1848 /* TODO: add threshold stuff again */
1850 return RX_DROP_MONITOR;
1853 switch (rx->key->conf.cipher) {
1854 case WLAN_CIPHER_SUITE_WEP40:
1855 case WLAN_CIPHER_SUITE_WEP104:
1856 result = ieee80211_crypto_wep_decrypt(rx);
1858 case WLAN_CIPHER_SUITE_TKIP:
1859 result = ieee80211_crypto_tkip_decrypt(rx);
1861 case WLAN_CIPHER_SUITE_CCMP:
1862 result = ieee80211_crypto_ccmp_decrypt(
1863 rx, IEEE80211_CCMP_MIC_LEN);
1865 case WLAN_CIPHER_SUITE_CCMP_256:
1866 result = ieee80211_crypto_ccmp_decrypt(
1867 rx, IEEE80211_CCMP_256_MIC_LEN);
1869 case WLAN_CIPHER_SUITE_AES_CMAC:
1870 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1872 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1873 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1875 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1876 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1877 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1879 case WLAN_CIPHER_SUITE_GCMP:
1880 case WLAN_CIPHER_SUITE_GCMP_256:
1881 result = ieee80211_crypto_gcmp_decrypt(rx);
1884 result = ieee80211_crypto_hw_decrypt(rx);
1887 /* the hdr variable is invalid after the decrypt handlers */
1889 /* either the frame has been decrypted or will be dropped */
1890 status->flag |= RX_FLAG_DECRYPTED;
1895 static inline struct ieee80211_fragment_entry *
1896 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1897 unsigned int frag, unsigned int seq, int rx_queue,
1898 struct sk_buff **skb)
1900 struct ieee80211_fragment_entry *entry;
1902 entry = &sdata->fragments[sdata->fragment_next++];
1903 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1904 sdata->fragment_next = 0;
1906 if (!skb_queue_empty(&entry->skb_list))
1907 __skb_queue_purge(&entry->skb_list);
1909 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1911 entry->first_frag_time = jiffies;
1913 entry->rx_queue = rx_queue;
1914 entry->last_frag = frag;
1915 entry->check_sequential_pn = false;
1916 entry->extra_len = 0;
1921 static inline struct ieee80211_fragment_entry *
1922 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1923 unsigned int frag, unsigned int seq,
1924 int rx_queue, struct ieee80211_hdr *hdr)
1926 struct ieee80211_fragment_entry *entry;
1929 idx = sdata->fragment_next;
1930 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1931 struct ieee80211_hdr *f_hdr;
1935 idx = IEEE80211_FRAGMENT_MAX - 1;
1937 entry = &sdata->fragments[idx];
1938 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1939 entry->rx_queue != rx_queue ||
1940 entry->last_frag + 1 != frag)
1943 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1946 * Check ftype and addresses are equal, else check next fragment
1948 if (((hdr->frame_control ^ f_hdr->frame_control) &
1949 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1950 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1951 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1954 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1955 __skb_queue_purge(&entry->skb_list);
1964 static ieee80211_rx_result debug_noinline
1965 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1967 struct ieee80211_hdr *hdr;
1970 unsigned int frag, seq;
1971 struct ieee80211_fragment_entry *entry;
1972 struct sk_buff *skb;
1974 hdr = (struct ieee80211_hdr *)rx->skb->data;
1975 fc = hdr->frame_control;
1977 if (ieee80211_is_ctl(fc))
1980 sc = le16_to_cpu(hdr->seq_ctrl);
1981 frag = sc & IEEE80211_SCTL_FRAG;
1983 if (is_multicast_ether_addr(hdr->addr1)) {
1984 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1988 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1991 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1993 if (skb_linearize(rx->skb))
1994 return RX_DROP_UNUSABLE;
1997 * skb_linearize() might change the skb->data and
1998 * previously cached variables (in this case, hdr) need to
1999 * be refreshed with the new data.
2001 hdr = (struct ieee80211_hdr *)rx->skb->data;
2002 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2005 /* This is the first fragment of a new frame. */
2006 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2007 rx->seqno_idx, &(rx->skb));
2009 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2010 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2011 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2012 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2013 ieee80211_has_protected(fc)) {
2014 int queue = rx->security_idx;
2016 /* Store CCMP/GCMP PN so that we can verify that the
2017 * next fragment has a sequential PN value.
2019 entry->check_sequential_pn = true;
2020 memcpy(entry->last_pn,
2021 rx->key->u.ccmp.rx_pn[queue],
2022 IEEE80211_CCMP_PN_LEN);
2023 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2025 offsetof(struct ieee80211_key,
2027 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2028 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2029 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2030 IEEE80211_GCMP_PN_LEN);
2035 /* This is a fragment for a frame that should already be pending in
2036 * fragment cache. Add this fragment to the end of the pending entry.
2038 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2039 rx->seqno_idx, hdr);
2041 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2042 return RX_DROP_MONITOR;
2045 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2046 * MPDU PN values are not incrementing in steps of 1."
2047 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2048 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2050 if (entry->check_sequential_pn) {
2052 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2056 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2057 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2058 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2059 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2060 return RX_DROP_UNUSABLE;
2061 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2062 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2067 queue = rx->security_idx;
2068 rpn = rx->key->u.ccmp.rx_pn[queue];
2069 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2070 return RX_DROP_UNUSABLE;
2071 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2074 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2075 __skb_queue_tail(&entry->skb_list, rx->skb);
2076 entry->last_frag = frag;
2077 entry->extra_len += rx->skb->len;
2078 if (ieee80211_has_morefrags(fc)) {
2083 rx->skb = __skb_dequeue(&entry->skb_list);
2084 if (skb_tailroom(rx->skb) < entry->extra_len) {
2085 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2086 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2088 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2089 __skb_queue_purge(&entry->skb_list);
2090 return RX_DROP_UNUSABLE;
2093 while ((skb = __skb_dequeue(&entry->skb_list))) {
2094 skb_put_data(rx->skb, skb->data, skb->len);
2099 ieee80211_led_rx(rx->local);
2102 rx->sta->rx_stats.packets++;
2106 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2108 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2114 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2116 struct sk_buff *skb = rx->skb;
2117 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2120 * Pass through unencrypted frames if the hardware has
2121 * decrypted them already.
2123 if (status->flag & RX_FLAG_DECRYPTED)
2126 /* Drop unencrypted frames if key is set. */
2127 if (unlikely(!ieee80211_has_protected(fc) &&
2128 !ieee80211_is_nullfunc(fc) &&
2129 ieee80211_is_data(fc) && rx->key))
2135 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2137 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2138 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2139 __le16 fc = hdr->frame_control;
2142 * Pass through unencrypted frames if the hardware has
2143 * decrypted them already.
2145 if (status->flag & RX_FLAG_DECRYPTED)
2148 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2149 if (unlikely(!ieee80211_has_protected(fc) &&
2150 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2152 if (ieee80211_is_deauth(fc) ||
2153 ieee80211_is_disassoc(fc))
2154 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2159 /* BIP does not use Protected field, so need to check MMIE */
2160 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2161 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2162 if (ieee80211_is_deauth(fc) ||
2163 ieee80211_is_disassoc(fc))
2164 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2170 * When using MFP, Action frames are not allowed prior to
2171 * having configured keys.
2173 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2174 ieee80211_is_robust_mgmt_frame(rx->skb)))
2182 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2184 struct ieee80211_sub_if_data *sdata = rx->sdata;
2185 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2186 bool check_port_control = false;
2187 struct ethhdr *ehdr;
2190 *port_control = false;
2191 if (ieee80211_has_a4(hdr->frame_control) &&
2192 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2195 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2196 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2198 if (!sdata->u.mgd.use_4addr)
2201 check_port_control = true;
2204 if (is_multicast_ether_addr(hdr->addr1) &&
2205 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2208 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2212 ehdr = (struct ethhdr *) rx->skb->data;
2213 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2214 *port_control = true;
2215 else if (check_port_control)
2222 * requires that rx->skb is a frame with ethernet header
2224 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2226 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2227 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2228 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2231 * Allow EAPOL frames to us/the PAE group address regardless
2232 * of whether the frame was encrypted or not.
2234 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2235 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2236 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2239 if (ieee80211_802_1x_port_control(rx) ||
2240 ieee80211_drop_unencrypted(rx, fc))
2246 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2247 struct ieee80211_rx_data *rx)
2249 struct ieee80211_sub_if_data *sdata = rx->sdata;
2250 struct net_device *dev = sdata->dev;
2252 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2253 skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2254 sdata->control_port_over_nl80211)) {
2255 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2256 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2258 cfg80211_rx_control_port(dev, skb, noencrypt);
2261 /* deliver to local stack */
2263 napi_gro_receive(rx->napi, skb);
2265 netif_receive_skb(skb);
2270 * requires that rx->skb is a frame with ethernet header
2273 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2275 struct ieee80211_sub_if_data *sdata = rx->sdata;
2276 struct net_device *dev = sdata->dev;
2277 struct sk_buff *skb, *xmit_skb;
2278 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2279 struct sta_info *dsta;
2284 ieee80211_rx_stats(dev, skb->len);
2287 /* The seqno index has the same property as needed
2288 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2289 * for non-QoS-data frames. Here we know it's a data
2290 * frame, so count MSDUs.
2292 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2293 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2294 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2297 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2298 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2299 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2300 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2301 if (is_multicast_ether_addr(ehdr->h_dest) &&
2302 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2304 * send multicast frames both to higher layers in
2305 * local net stack and back to the wireless medium
2307 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2309 net_info_ratelimited("%s: failed to clone multicast frame\n",
2311 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2312 dsta = sta_info_get(sdata, skb->data);
2315 * The destination station is associated to
2316 * this AP (in this VLAN), so send the frame
2317 * directly to it and do not pass it to local
2326 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2328 /* 'align' will only take the values 0 or 2 here since all
2329 * frames are required to be aligned to 2-byte boundaries
2330 * when being passed to mac80211; the code here works just
2331 * as well if that isn't true, but mac80211 assumes it can
2332 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2336 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2338 if (WARN_ON(skb_headroom(skb) < 3)) {
2342 u8 *data = skb->data;
2343 size_t len = skb_headlen(skb);
2345 memmove(skb->data, data, len);
2346 skb_set_tail_pointer(skb, len);
2353 skb->protocol = eth_type_trans(skb, dev);
2354 memset(skb->cb, 0, sizeof(skb->cb));
2356 ieee80211_deliver_skb_to_local_stack(skb, rx);
2361 * Send to wireless media and increase priority by 256 to
2362 * keep the received priority instead of reclassifying
2363 * the frame (see cfg80211_classify8021d).
2365 xmit_skb->priority += 256;
2366 xmit_skb->protocol = htons(ETH_P_802_3);
2367 skb_reset_network_header(xmit_skb);
2368 skb_reset_mac_header(xmit_skb);
2369 dev_queue_xmit(xmit_skb);
2373 static ieee80211_rx_result debug_noinline
2374 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2376 struct net_device *dev = rx->sdata->dev;
2377 struct sk_buff *skb = rx->skb;
2378 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2379 __le16 fc = hdr->frame_control;
2380 struct sk_buff_head frame_list;
2381 struct ethhdr ethhdr;
2382 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2384 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2387 } else switch (rx->sdata->vif.type) {
2388 case NL80211_IFTYPE_AP:
2389 case NL80211_IFTYPE_AP_VLAN:
2392 case NL80211_IFTYPE_STATION:
2394 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2397 case NL80211_IFTYPE_MESH_POINT:
2405 __skb_queue_head_init(&frame_list);
2407 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2408 rx->sdata->vif.addr,
2409 rx->sdata->vif.type,
2411 return RX_DROP_UNUSABLE;
2413 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2414 rx->sdata->vif.type,
2415 rx->local->hw.extra_tx_headroom,
2416 check_da, check_sa);
2418 while (!skb_queue_empty(&frame_list)) {
2419 rx->skb = __skb_dequeue(&frame_list);
2421 if (!ieee80211_frame_allowed(rx, fc)) {
2422 dev_kfree_skb(rx->skb);
2426 ieee80211_deliver_skb(rx);
2432 static ieee80211_rx_result debug_noinline
2433 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2435 struct sk_buff *skb = rx->skb;
2436 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2437 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2438 __le16 fc = hdr->frame_control;
2440 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2443 if (unlikely(!ieee80211_is_data(fc)))
2446 if (unlikely(!ieee80211_is_data_present(fc)))
2447 return RX_DROP_MONITOR;
2449 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2450 switch (rx->sdata->vif.type) {
2451 case NL80211_IFTYPE_AP_VLAN:
2452 if (!rx->sdata->u.vlan.sta)
2453 return RX_DROP_UNUSABLE;
2455 case NL80211_IFTYPE_STATION:
2456 if (!rx->sdata->u.mgd.use_4addr)
2457 return RX_DROP_UNUSABLE;
2460 return RX_DROP_UNUSABLE;
2464 if (is_multicast_ether_addr(hdr->addr1))
2465 return RX_DROP_UNUSABLE;
2467 return __ieee80211_rx_h_amsdu(rx, 0);
2470 #ifdef CONFIG_MAC80211_MESH
2471 static ieee80211_rx_result
2472 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2474 struct ieee80211_hdr *fwd_hdr, *hdr;
2475 struct ieee80211_tx_info *info;
2476 struct ieee80211s_hdr *mesh_hdr;
2477 struct sk_buff *skb = rx->skb, *fwd_skb;
2478 struct ieee80211_local *local = rx->local;
2479 struct ieee80211_sub_if_data *sdata = rx->sdata;
2480 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2483 hdr = (struct ieee80211_hdr *) skb->data;
2484 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2486 /* make sure fixed part of mesh header is there, also checks skb len */
2487 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2488 return RX_DROP_MONITOR;
2490 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2492 /* make sure full mesh header is there, also checks skb len */
2493 if (!pskb_may_pull(rx->skb,
2494 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2495 return RX_DROP_MONITOR;
2497 /* reload pointers */
2498 hdr = (struct ieee80211_hdr *) skb->data;
2499 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2501 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2502 return RX_DROP_MONITOR;
2504 /* frame is in RMC, don't forward */
2505 if (ieee80211_is_data(hdr->frame_control) &&
2506 is_multicast_ether_addr(hdr->addr1) &&
2507 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2508 return RX_DROP_MONITOR;
2510 if (!ieee80211_is_data(hdr->frame_control))
2514 return RX_DROP_MONITOR;
2516 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2517 struct mesh_path *mppath;
2521 if (is_multicast_ether_addr(hdr->addr1)) {
2522 mpp_addr = hdr->addr3;
2523 proxied_addr = mesh_hdr->eaddr1;
2524 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2525 MESH_FLAGS_AE_A5_A6) {
2526 /* has_a4 already checked in ieee80211_rx_mesh_check */
2527 mpp_addr = hdr->addr4;
2528 proxied_addr = mesh_hdr->eaddr2;
2530 return RX_DROP_MONITOR;
2534 mppath = mpp_path_lookup(sdata, proxied_addr);
2536 mpp_path_add(sdata, proxied_addr, mpp_addr);
2538 spin_lock_bh(&mppath->state_lock);
2539 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2540 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2541 mppath->exp_time = jiffies;
2542 spin_unlock_bh(&mppath->state_lock);
2547 /* Frame has reached destination. Don't forward */
2548 if (!is_multicast_ether_addr(hdr->addr1) &&
2549 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2552 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2553 q = sdata->vif.hw_queue[ac];
2554 if (ieee80211_queue_stopped(&local->hw, q)) {
2555 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2556 return RX_DROP_MONITOR;
2558 skb_set_queue_mapping(skb, q);
2560 if (!--mesh_hdr->ttl) {
2561 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2565 if (!ifmsh->mshcfg.dot11MeshForwarding)
2568 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2569 sdata->encrypt_headroom, 0, GFP_ATOMIC);
2573 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2574 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2575 info = IEEE80211_SKB_CB(fwd_skb);
2576 memset(info, 0, sizeof(*info));
2577 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2578 info->control.vif = &rx->sdata->vif;
2579 info->control.jiffies = jiffies;
2580 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2581 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2582 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2583 /* update power mode indication when forwarding */
2584 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2585 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2586 /* mesh power mode flags updated in mesh_nexthop_lookup */
2587 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2589 /* unable to resolve next hop */
2590 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2592 WLAN_REASON_MESH_PATH_NOFORWARD,
2594 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2596 return RX_DROP_MONITOR;
2599 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2600 ieee80211_add_pending_skb(local, fwd_skb);
2602 if (is_multicast_ether_addr(hdr->addr1))
2604 return RX_DROP_MONITOR;
2608 static ieee80211_rx_result debug_noinline
2609 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2611 struct ieee80211_sub_if_data *sdata = rx->sdata;
2612 struct ieee80211_local *local = rx->local;
2613 struct net_device *dev = sdata->dev;
2614 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2615 __le16 fc = hdr->frame_control;
2619 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2622 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2623 return RX_DROP_MONITOR;
2626 * Send unexpected-4addr-frame event to hostapd. For older versions,
2627 * also drop the frame to cooked monitor interfaces.
2629 if (ieee80211_has_a4(hdr->frame_control) &&
2630 sdata->vif.type == NL80211_IFTYPE_AP) {
2632 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2633 cfg80211_rx_unexpected_4addr_frame(
2634 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2635 return RX_DROP_MONITOR;
2638 err = __ieee80211_data_to_8023(rx, &port_control);
2640 return RX_DROP_UNUSABLE;
2642 if (!ieee80211_frame_allowed(rx, fc))
2643 return RX_DROP_MONITOR;
2645 /* directly handle TDLS channel switch requests/responses */
2646 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2647 cpu_to_be16(ETH_P_TDLS))) {
2648 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2650 if (pskb_may_pull(rx->skb,
2651 offsetof(struct ieee80211_tdls_data, u)) &&
2652 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2653 tf->category == WLAN_CATEGORY_TDLS &&
2654 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2655 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2656 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2657 schedule_work(&local->tdls_chsw_work);
2659 rx->sta->rx_stats.packets++;
2665 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2666 unlikely(port_control) && sdata->bss) {
2667 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2675 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2676 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2677 !is_multicast_ether_addr(
2678 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2679 (!local->scanning &&
2680 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2681 mod_timer(&local->dynamic_ps_timer, jiffies +
2682 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2684 ieee80211_deliver_skb(rx);
2689 static ieee80211_rx_result debug_noinline
2690 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2692 struct sk_buff *skb = rx->skb;
2693 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2694 struct tid_ampdu_rx *tid_agg_rx;
2698 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2701 if (ieee80211_is_back_req(bar->frame_control)) {
2703 __le16 control, start_seq_num;
2704 } __packed bar_data;
2705 struct ieee80211_event event = {
2706 .type = BAR_RX_EVENT,
2710 return RX_DROP_MONITOR;
2712 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2713 &bar_data, sizeof(bar_data)))
2714 return RX_DROP_MONITOR;
2716 tid = le16_to_cpu(bar_data.control) >> 12;
2718 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2719 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2720 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2721 WLAN_BACK_RECIPIENT,
2722 WLAN_REASON_QSTA_REQUIRE_SETUP);
2724 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2726 return RX_DROP_MONITOR;
2728 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2729 event.u.ba.tid = tid;
2730 event.u.ba.ssn = start_seq_num;
2731 event.u.ba.sta = &rx->sta->sta;
2733 /* reset session timer */
2734 if (tid_agg_rx->timeout)
2735 mod_timer(&tid_agg_rx->session_timer,
2736 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2738 spin_lock(&tid_agg_rx->reorder_lock);
2739 /* release stored frames up to start of BAR */
2740 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2741 start_seq_num, frames);
2742 spin_unlock(&tid_agg_rx->reorder_lock);
2744 drv_event_callback(rx->local, rx->sdata, &event);
2751 * After this point, we only want management frames,
2752 * so we can drop all remaining control frames to
2753 * cooked monitor interfaces.
2755 return RX_DROP_MONITOR;
2758 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2759 struct ieee80211_mgmt *mgmt,
2762 struct ieee80211_local *local = sdata->local;
2763 struct sk_buff *skb;
2764 struct ieee80211_mgmt *resp;
2766 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2767 /* Not to own unicast address */
2771 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2772 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2773 /* Not from the current AP or not associated yet. */
2777 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2778 /* Too short SA Query request frame */
2782 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2786 skb_reserve(skb, local->hw.extra_tx_headroom);
2787 resp = skb_put_zero(skb, 24);
2788 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2789 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2790 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2791 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2792 IEEE80211_STYPE_ACTION);
2793 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2794 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2795 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2796 memcpy(resp->u.action.u.sa_query.trans_id,
2797 mgmt->u.action.u.sa_query.trans_id,
2798 WLAN_SA_QUERY_TR_ID_LEN);
2800 ieee80211_tx_skb(sdata, skb);
2803 static ieee80211_rx_result debug_noinline
2804 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2806 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2810 * From here on, look only at management frames.
2811 * Data and control frames are already handled,
2812 * and unknown (reserved) frames are useless.
2814 if (rx->skb->len < 24)
2815 return RX_DROP_MONITOR;
2817 if (!ieee80211_is_mgmt(mgmt->frame_control))
2818 return RX_DROP_MONITOR;
2820 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2821 ieee80211_is_beacon(mgmt->frame_control) &&
2822 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2825 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2826 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2827 sig = status->signal;
2829 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2830 rx->skb->data, rx->skb->len,
2832 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2835 if (ieee80211_drop_unencrypted_mgmt(rx))
2836 return RX_DROP_UNUSABLE;
2841 static ieee80211_rx_result debug_noinline
2842 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2844 struct ieee80211_local *local = rx->local;
2845 struct ieee80211_sub_if_data *sdata = rx->sdata;
2846 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2847 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2848 int len = rx->skb->len;
2850 if (!ieee80211_is_action(mgmt->frame_control))
2853 /* drop too small frames */
2854 if (len < IEEE80211_MIN_ACTION_SIZE)
2855 return RX_DROP_UNUSABLE;
2857 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2858 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2859 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2860 return RX_DROP_UNUSABLE;
2862 switch (mgmt->u.action.category) {
2863 case WLAN_CATEGORY_HT:
2864 /* reject HT action frames from stations not supporting HT */
2865 if (!rx->sta->sta.ht_cap.ht_supported)
2868 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2869 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2870 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2871 sdata->vif.type != NL80211_IFTYPE_AP &&
2872 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2875 /* verify action & smps_control/chanwidth are present */
2876 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2879 switch (mgmt->u.action.u.ht_smps.action) {
2880 case WLAN_HT_ACTION_SMPS: {
2881 struct ieee80211_supported_band *sband;
2882 enum ieee80211_smps_mode smps_mode;
2883 struct sta_opmode_info sta_opmode = {};
2885 /* convert to HT capability */
2886 switch (mgmt->u.action.u.ht_smps.smps_control) {
2887 case WLAN_HT_SMPS_CONTROL_DISABLED:
2888 smps_mode = IEEE80211_SMPS_OFF;
2890 case WLAN_HT_SMPS_CONTROL_STATIC:
2891 smps_mode = IEEE80211_SMPS_STATIC;
2893 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2894 smps_mode = IEEE80211_SMPS_DYNAMIC;
2900 /* if no change do nothing */
2901 if (rx->sta->sta.smps_mode == smps_mode)
2903 rx->sta->sta.smps_mode = smps_mode;
2904 sta_opmode.smps_mode =
2905 ieee80211_smps_mode_to_smps_mode(smps_mode);
2906 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
2908 sband = rx->local->hw.wiphy->bands[status->band];
2910 rate_control_rate_update(local, sband, rx->sta,
2911 IEEE80211_RC_SMPS_CHANGED);
2912 cfg80211_sta_opmode_change_notify(sdata->dev,
2918 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2919 struct ieee80211_supported_band *sband;
2920 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2921 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2922 struct sta_opmode_info sta_opmode = {};
2924 /* If it doesn't support 40 MHz it can't change ... */
2925 if (!(rx->sta->sta.ht_cap.cap &
2926 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2929 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2930 max_bw = IEEE80211_STA_RX_BW_20;
2932 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2934 /* set cur_max_bandwidth and recalc sta bw */
2935 rx->sta->cur_max_bandwidth = max_bw;
2936 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2938 if (rx->sta->sta.bandwidth == new_bw)
2941 rx->sta->sta.bandwidth = new_bw;
2942 sband = rx->local->hw.wiphy->bands[status->band];
2944 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
2945 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
2947 rate_control_rate_update(local, sband, rx->sta,
2948 IEEE80211_RC_BW_CHANGED);
2949 cfg80211_sta_opmode_change_notify(sdata->dev,
2960 case WLAN_CATEGORY_PUBLIC:
2961 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2963 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2967 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2969 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2970 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2972 if (len < offsetof(struct ieee80211_mgmt,
2973 u.action.u.ext_chan_switch.variable))
2976 case WLAN_CATEGORY_VHT:
2977 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2978 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2979 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2980 sdata->vif.type != NL80211_IFTYPE_AP &&
2981 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2984 /* verify action code is present */
2985 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2988 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2989 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2990 /* verify opmode is present */
2991 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2995 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2996 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3004 case WLAN_CATEGORY_BACK:
3005 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3006 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3007 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3008 sdata->vif.type != NL80211_IFTYPE_AP &&
3009 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3012 /* verify action_code is present */
3013 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3016 switch (mgmt->u.action.u.addba_req.action_code) {
3017 case WLAN_ACTION_ADDBA_REQ:
3018 if (len < (IEEE80211_MIN_ACTION_SIZE +
3019 sizeof(mgmt->u.action.u.addba_req)))
3022 case WLAN_ACTION_ADDBA_RESP:
3023 if (len < (IEEE80211_MIN_ACTION_SIZE +
3024 sizeof(mgmt->u.action.u.addba_resp)))
3027 case WLAN_ACTION_DELBA:
3028 if (len < (IEEE80211_MIN_ACTION_SIZE +
3029 sizeof(mgmt->u.action.u.delba)))
3037 case WLAN_CATEGORY_SPECTRUM_MGMT:
3038 /* verify action_code is present */
3039 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3042 switch (mgmt->u.action.u.measurement.action_code) {
3043 case WLAN_ACTION_SPCT_MSR_REQ:
3044 if (status->band != NL80211_BAND_5GHZ)
3047 if (len < (IEEE80211_MIN_ACTION_SIZE +
3048 sizeof(mgmt->u.action.u.measurement)))
3051 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3054 ieee80211_process_measurement_req(sdata, mgmt, len);
3056 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3058 if (len < (IEEE80211_MIN_ACTION_SIZE +
3059 sizeof(mgmt->u.action.u.chan_switch)))
3062 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3063 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3064 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3067 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3068 bssid = sdata->u.mgd.bssid;
3069 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3070 bssid = sdata->u.ibss.bssid;
3071 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3076 if (!ether_addr_equal(mgmt->bssid, bssid))
3083 case WLAN_CATEGORY_SA_QUERY:
3084 if (len < (IEEE80211_MIN_ACTION_SIZE +
3085 sizeof(mgmt->u.action.u.sa_query)))
3088 switch (mgmt->u.action.u.sa_query.action) {
3089 case WLAN_ACTION_SA_QUERY_REQUEST:
3090 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3092 ieee80211_process_sa_query_req(sdata, mgmt, len);
3096 case WLAN_CATEGORY_SELF_PROTECTED:
3097 if (len < (IEEE80211_MIN_ACTION_SIZE +
3098 sizeof(mgmt->u.action.u.self_prot.action_code)))
3101 switch (mgmt->u.action.u.self_prot.action_code) {
3102 case WLAN_SP_MESH_PEERING_OPEN:
3103 case WLAN_SP_MESH_PEERING_CLOSE:
3104 case WLAN_SP_MESH_PEERING_CONFIRM:
3105 if (!ieee80211_vif_is_mesh(&sdata->vif))
3107 if (sdata->u.mesh.user_mpm)
3108 /* userspace handles this frame */
3111 case WLAN_SP_MGK_INFORM:
3112 case WLAN_SP_MGK_ACK:
3113 if (!ieee80211_vif_is_mesh(&sdata->vif))
3118 case WLAN_CATEGORY_MESH_ACTION:
3119 if (len < (IEEE80211_MIN_ACTION_SIZE +
3120 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3123 if (!ieee80211_vif_is_mesh(&sdata->vif))
3125 if (mesh_action_is_path_sel(mgmt) &&
3126 !mesh_path_sel_is_hwmp(sdata))
3134 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3135 /* will return in the next handlers */
3140 rx->sta->rx_stats.packets++;
3141 dev_kfree_skb(rx->skb);
3145 skb_queue_tail(&sdata->skb_queue, rx->skb);
3146 ieee80211_queue_work(&local->hw, &sdata->work);
3148 rx->sta->rx_stats.packets++;
3152 static ieee80211_rx_result debug_noinline
3153 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3155 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3158 /* skip known-bad action frames and return them in the next handler */
3159 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3163 * Getting here means the kernel doesn't know how to handle
3164 * it, but maybe userspace does ... include returned frames
3165 * so userspace can register for those to know whether ones
3166 * it transmitted were processed or returned.
3169 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3170 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3171 sig = status->signal;
3173 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3174 rx->skb->data, rx->skb->len, 0)) {
3176 rx->sta->rx_stats.packets++;
3177 dev_kfree_skb(rx->skb);
3184 static ieee80211_rx_result debug_noinline
3185 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3187 struct ieee80211_local *local = rx->local;
3188 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3189 struct sk_buff *nskb;
3190 struct ieee80211_sub_if_data *sdata = rx->sdata;
3191 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3193 if (!ieee80211_is_action(mgmt->frame_control))
3197 * For AP mode, hostapd is responsible for handling any action
3198 * frames that we didn't handle, including returning unknown
3199 * ones. For all other modes we will return them to the sender,
3200 * setting the 0x80 bit in the action category, as required by
3201 * 802.11-2012 9.24.4.
3202 * Newer versions of hostapd shall also use the management frame
3203 * registration mechanisms, but older ones still use cooked
3204 * monitor interfaces so push all frames there.
3206 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3207 (sdata->vif.type == NL80211_IFTYPE_AP ||
3208 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3209 return RX_DROP_MONITOR;
3211 if (is_multicast_ether_addr(mgmt->da))
3212 return RX_DROP_MONITOR;
3214 /* do not return rejected action frames */
3215 if (mgmt->u.action.category & 0x80)
3216 return RX_DROP_UNUSABLE;
3218 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3221 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3223 nmgmt->u.action.category |= 0x80;
3224 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3225 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3227 memset(nskb->cb, 0, sizeof(nskb->cb));
3229 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3230 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3232 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3233 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3234 IEEE80211_TX_CTL_NO_CCK_RATE;
3235 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3237 local->hw.offchannel_tx_hw_queue;
3240 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3243 dev_kfree_skb(rx->skb);
3247 static ieee80211_rx_result debug_noinline
3248 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3250 struct ieee80211_sub_if_data *sdata = rx->sdata;
3251 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3254 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3256 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3257 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3258 sdata->vif.type != NL80211_IFTYPE_OCB &&
3259 sdata->vif.type != NL80211_IFTYPE_STATION)
3260 return RX_DROP_MONITOR;
3263 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3264 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3265 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3266 /* process for all: mesh, mlme, ibss */
3268 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3269 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3270 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3271 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3272 if (is_multicast_ether_addr(mgmt->da) &&
3273 !is_broadcast_ether_addr(mgmt->da))
3274 return RX_DROP_MONITOR;
3276 /* process only for station */
3277 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3278 return RX_DROP_MONITOR;
3280 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3281 /* process only for ibss and mesh */
3282 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3283 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3284 return RX_DROP_MONITOR;
3287 return RX_DROP_MONITOR;
3290 /* queue up frame and kick off work to process it */
3291 skb_queue_tail(&sdata->skb_queue, rx->skb);
3292 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3294 rx->sta->rx_stats.packets++;
3299 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3300 struct ieee80211_rate *rate)
3302 struct ieee80211_sub_if_data *sdata;
3303 struct ieee80211_local *local = rx->local;
3304 struct sk_buff *skb = rx->skb, *skb2;
3305 struct net_device *prev_dev = NULL;
3306 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3307 int needed_headroom;
3310 * If cooked monitor has been processed already, then
3311 * don't do it again. If not, set the flag.
3313 if (rx->flags & IEEE80211_RX_CMNTR)
3315 rx->flags |= IEEE80211_RX_CMNTR;
3317 /* If there are no cooked monitor interfaces, just free the SKB */
3318 if (!local->cooked_mntrs)
3321 /* vendor data is long removed here */
3322 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3323 /* room for the radiotap header based on driver features */
3324 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3326 if (skb_headroom(skb) < needed_headroom &&
3327 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3330 /* prepend radiotap information */
3331 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3334 skb_reset_mac_header(skb);
3335 skb->ip_summed = CHECKSUM_UNNECESSARY;
3336 skb->pkt_type = PACKET_OTHERHOST;
3337 skb->protocol = htons(ETH_P_802_2);
3339 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3340 if (!ieee80211_sdata_running(sdata))
3343 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3344 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3348 skb2 = skb_clone(skb, GFP_ATOMIC);
3350 skb2->dev = prev_dev;
3351 netif_receive_skb(skb2);
3355 prev_dev = sdata->dev;
3356 ieee80211_rx_stats(sdata->dev, skb->len);
3360 skb->dev = prev_dev;
3361 netif_receive_skb(skb);
3369 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3370 ieee80211_rx_result res)
3373 case RX_DROP_MONITOR:
3374 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3376 rx->sta->rx_stats.dropped++;
3379 struct ieee80211_rate *rate = NULL;
3380 struct ieee80211_supported_band *sband;
3381 struct ieee80211_rx_status *status;
3383 status = IEEE80211_SKB_RXCB((rx->skb));
3385 sband = rx->local->hw.wiphy->bands[status->band];
3386 if (!(status->encoding == RX_ENC_HT) &&
3387 !(status->encoding == RX_ENC_VHT))
3388 rate = &sband->bitrates[status->rate_idx];
3390 ieee80211_rx_cooked_monitor(rx, rate);
3393 case RX_DROP_UNUSABLE:
3394 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3396 rx->sta->rx_stats.dropped++;
3397 dev_kfree_skb(rx->skb);
3400 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3405 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3406 struct sk_buff_head *frames)
3408 ieee80211_rx_result res = RX_DROP_MONITOR;
3409 struct sk_buff *skb;
3411 #define CALL_RXH(rxh) \
3414 if (res != RX_CONTINUE) \
3418 /* Lock here to avoid hitting all of the data used in the RX
3419 * path (e.g. key data, station data, ...) concurrently when
3420 * a frame is released from the reorder buffer due to timeout
3421 * from the timer, potentially concurrently with RX from the
3424 spin_lock_bh(&rx->local->rx_path_lock);
3426 while ((skb = __skb_dequeue(frames))) {
3428 * all the other fields are valid across frames
3429 * that belong to an aMPDU since they are on the
3430 * same TID from the same station
3434 CALL_RXH(ieee80211_rx_h_check_more_data);
3435 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3436 CALL_RXH(ieee80211_rx_h_sta_process);
3437 CALL_RXH(ieee80211_rx_h_decrypt);
3438 CALL_RXH(ieee80211_rx_h_defragment);
3439 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3440 /* must be after MMIC verify so header is counted in MPDU mic */
3441 #ifdef CONFIG_MAC80211_MESH
3442 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3443 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3445 CALL_RXH(ieee80211_rx_h_amsdu);
3446 CALL_RXH(ieee80211_rx_h_data);
3448 /* special treatment -- needs the queue */
3449 res = ieee80211_rx_h_ctrl(rx, frames);
3450 if (res != RX_CONTINUE)
3453 CALL_RXH(ieee80211_rx_h_mgmt_check);
3454 CALL_RXH(ieee80211_rx_h_action);
3455 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3456 CALL_RXH(ieee80211_rx_h_action_return);
3457 CALL_RXH(ieee80211_rx_h_mgmt);
3460 ieee80211_rx_handlers_result(rx, res);
3465 spin_unlock_bh(&rx->local->rx_path_lock);
3468 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3470 struct sk_buff_head reorder_release;
3471 ieee80211_rx_result res = RX_DROP_MONITOR;
3473 __skb_queue_head_init(&reorder_release);
3475 #define CALL_RXH(rxh) \
3478 if (res != RX_CONTINUE) \
3482 CALL_RXH(ieee80211_rx_h_check_dup);
3483 CALL_RXH(ieee80211_rx_h_check);
3485 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3487 ieee80211_rx_handlers(rx, &reorder_release);
3491 ieee80211_rx_handlers_result(rx, res);
3497 * This function makes calls into the RX path, therefore
3498 * it has to be invoked under RCU read lock.
3500 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3502 struct sk_buff_head frames;
3503 struct ieee80211_rx_data rx = {
3505 .sdata = sta->sdata,
3506 .local = sta->local,
3507 /* This is OK -- must be QoS data frame */
3508 .security_idx = tid,
3510 .napi = NULL, /* must be NULL to not have races */
3512 struct tid_ampdu_rx *tid_agg_rx;
3514 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3518 __skb_queue_head_init(&frames);
3520 spin_lock(&tid_agg_rx->reorder_lock);
3521 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3522 spin_unlock(&tid_agg_rx->reorder_lock);
3524 if (!skb_queue_empty(&frames)) {
3525 struct ieee80211_event event = {
3526 .type = BA_FRAME_TIMEOUT,
3528 .u.ba.sta = &sta->sta,
3530 drv_event_callback(rx.local, rx.sdata, &event);
3533 ieee80211_rx_handlers(&rx, &frames);
3536 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3537 u16 ssn, u64 filtered,
3540 struct sta_info *sta;
3541 struct tid_ampdu_rx *tid_agg_rx;
3542 struct sk_buff_head frames;
3543 struct ieee80211_rx_data rx = {
3544 /* This is OK -- must be QoS data frame */
3545 .security_idx = tid,
3550 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3553 __skb_queue_head_init(&frames);
3555 sta = container_of(pubsta, struct sta_info, sta);
3558 rx.sdata = sta->sdata;
3559 rx.local = sta->local;
3562 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3566 spin_lock_bh(&tid_agg_rx->reorder_lock);
3568 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3571 /* release all frames in the reorder buffer */
3572 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3573 IEEE80211_SN_MODULO;
3574 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3576 /* update ssn to match received ssn */
3577 tid_agg_rx->head_seq_num = ssn;
3579 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3583 /* handle the case that received ssn is behind the mac ssn.
3584 * it can be tid_agg_rx->buf_size behind and still be valid */
3585 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3586 if (diff >= tid_agg_rx->buf_size) {
3587 tid_agg_rx->reorder_buf_filtered = 0;
3590 filtered = filtered >> diff;
3594 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3595 int index = (ssn + i) % tid_agg_rx->buf_size;
3597 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3598 if (filtered & BIT_ULL(i))
3599 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3602 /* now process also frames that the filter marking released */
3603 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3606 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3608 ieee80211_rx_handlers(&rx, &frames);
3613 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3615 /* main receive path */
3617 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3619 struct ieee80211_sub_if_data *sdata = rx->sdata;
3620 struct sk_buff *skb = rx->skb;
3621 struct ieee80211_hdr *hdr = (void *)skb->data;
3622 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3623 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3624 bool multicast = is_multicast_ether_addr(hdr->addr1);
3626 switch (sdata->vif.type) {
3627 case NL80211_IFTYPE_STATION:
3628 if (!bssid && !sdata->u.mgd.use_4addr)
3632 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3633 case NL80211_IFTYPE_ADHOC:
3636 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3637 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3639 if (ieee80211_is_beacon(hdr->frame_control))
3641 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3644 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3648 if (status->encoding != RX_ENC_LEGACY)
3649 rate_idx = 0; /* TODO: HT/VHT rates */
3651 rate_idx = status->rate_idx;
3652 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3656 case NL80211_IFTYPE_OCB:
3659 if (!ieee80211_is_data_present(hdr->frame_control))
3661 if (!is_broadcast_ether_addr(bssid))
3664 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3668 if (status->encoding != RX_ENC_LEGACY)
3669 rate_idx = 0; /* TODO: HT rates */
3671 rate_idx = status->rate_idx;
3672 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3676 case NL80211_IFTYPE_MESH_POINT:
3677 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3681 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3682 case NL80211_IFTYPE_AP_VLAN:
3683 case NL80211_IFTYPE_AP:
3685 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3687 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3689 * Accept public action frames even when the
3690 * BSSID doesn't match, this is used for P2P
3691 * and location updates. Note that mac80211
3692 * itself never looks at these frames.
3695 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3697 if (ieee80211_is_public_action(hdr, skb->len))
3699 return ieee80211_is_beacon(hdr->frame_control);
3702 if (!ieee80211_has_tods(hdr->frame_control)) {
3703 /* ignore data frames to TDLS-peers */
3704 if (ieee80211_is_data(hdr->frame_control))
3706 /* ignore action frames to TDLS-peers */
3707 if (ieee80211_is_action(hdr->frame_control) &&
3708 !is_broadcast_ether_addr(bssid) &&
3709 !ether_addr_equal(bssid, hdr->addr1))
3714 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3715 * the BSSID - we've checked that already but may have accepted
3716 * the wildcard (ff:ff:ff:ff:ff:ff).
3719 * The BSSID of the Data frame is determined as follows:
3720 * a) If the STA is contained within an AP or is associated
3721 * with an AP, the BSSID is the address currently in use
3722 * by the STA contained in the AP.
3724 * So we should not accept data frames with an address that's
3727 * Accepting it also opens a security problem because stations
3728 * could encrypt it with the GTK and inject traffic that way.
3730 if (ieee80211_is_data(hdr->frame_control) && multicast)
3734 case NL80211_IFTYPE_WDS:
3735 if (bssid || !ieee80211_is_data(hdr->frame_control))
3737 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3738 case NL80211_IFTYPE_P2P_DEVICE:
3739 return ieee80211_is_public_action(hdr, skb->len) ||
3740 ieee80211_is_probe_req(hdr->frame_control) ||
3741 ieee80211_is_probe_resp(hdr->frame_control) ||
3742 ieee80211_is_beacon(hdr->frame_control);
3743 case NL80211_IFTYPE_NAN:
3744 /* Currently no frames on NAN interface are allowed */
3754 void ieee80211_check_fast_rx(struct sta_info *sta)
3756 struct ieee80211_sub_if_data *sdata = sta->sdata;
3757 struct ieee80211_local *local = sdata->local;
3758 struct ieee80211_key *key;
3759 struct ieee80211_fast_rx fastrx = {
3761 .vif_type = sdata->vif.type,
3762 .control_port_protocol = sdata->control_port_protocol,
3763 }, *old, *new = NULL;
3764 bool assign = false;
3766 /* use sparse to check that we don't return without updating */
3767 __acquire(check_fast_rx);
3769 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3770 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3771 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3772 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3774 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3776 /* fast-rx doesn't do reordering */
3777 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3778 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3781 switch (sdata->vif.type) {
3782 case NL80211_IFTYPE_STATION:
3783 if (sta->sta.tdls) {
3784 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3785 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3786 fastrx.expected_ds_bits = 0;
3788 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3789 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3790 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3791 fastrx.expected_ds_bits =
3792 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3795 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3796 fastrx.expected_ds_bits |=
3797 cpu_to_le16(IEEE80211_FCTL_TODS);
3798 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3799 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3802 if (!sdata->u.mgd.powersave)
3805 /* software powersave is a huge mess, avoid all of it */
3806 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3808 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3809 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3812 case NL80211_IFTYPE_AP_VLAN:
3813 case NL80211_IFTYPE_AP:
3814 /* parallel-rx requires this, at least with calls to
3815 * ieee80211_sta_ps_transition()
3817 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3819 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3820 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3821 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3823 fastrx.internal_forward =
3824 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3825 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3826 !sdata->u.vlan.sta);
3828 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3829 sdata->u.vlan.sta) {
3830 fastrx.expected_ds_bits |=
3831 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3832 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3833 fastrx.internal_forward = 0;
3841 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3845 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3847 switch (key->conf.cipher) {
3848 case WLAN_CIPHER_SUITE_TKIP:
3849 /* we don't want to deal with MMIC in fast-rx */
3851 case WLAN_CIPHER_SUITE_CCMP:
3852 case WLAN_CIPHER_SUITE_CCMP_256:
3853 case WLAN_CIPHER_SUITE_GCMP:
3854 case WLAN_CIPHER_SUITE_GCMP_256:
3857 /* we also don't want to deal with WEP or cipher scheme
3858 * since those require looking up the key idx in the
3859 * frame, rather than assuming the PTK is used
3860 * (we need to revisit this once we implement the real
3861 * PTK index, which is now valid in the spec, but we
3862 * haven't implemented that part yet)
3868 fastrx.icv_len = key->conf.icv_len;
3875 __release(check_fast_rx);
3878 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3880 spin_lock_bh(&sta->lock);
3881 old = rcu_dereference_protected(sta->fast_rx, true);
3882 rcu_assign_pointer(sta->fast_rx, new);
3883 spin_unlock_bh(&sta->lock);
3886 kfree_rcu(old, rcu_head);
3889 void ieee80211_clear_fast_rx(struct sta_info *sta)
3891 struct ieee80211_fast_rx *old;
3893 spin_lock_bh(&sta->lock);
3894 old = rcu_dereference_protected(sta->fast_rx, true);
3895 RCU_INIT_POINTER(sta->fast_rx, NULL);
3896 spin_unlock_bh(&sta->lock);
3899 kfree_rcu(old, rcu_head);
3902 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3904 struct ieee80211_local *local = sdata->local;
3905 struct sta_info *sta;
3907 lockdep_assert_held(&local->sta_mtx);
3909 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3910 if (sdata != sta->sdata &&
3911 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3913 ieee80211_check_fast_rx(sta);
3917 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3919 struct ieee80211_local *local = sdata->local;
3921 mutex_lock(&local->sta_mtx);
3922 __ieee80211_check_fast_rx_iface(sdata);
3923 mutex_unlock(&local->sta_mtx);
3926 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3927 struct ieee80211_fast_rx *fast_rx)
3929 struct sk_buff *skb = rx->skb;
3930 struct ieee80211_hdr *hdr = (void *)skb->data;
3931 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3932 struct sta_info *sta = rx->sta;
3933 int orig_len = skb->len;
3934 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
3935 int snap_offs = hdrlen;
3937 u8 snap[sizeof(rfc1042_header)];
3939 } *payload __aligned(2);
3943 } addrs __aligned(2);
3944 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3946 if (fast_rx->uses_rss)
3947 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3949 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3950 * to a common data structure; drivers can implement that per queue
3951 * but we don't have that information in mac80211
3953 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3956 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3958 /* If using encryption, we also need to have:
3959 * - PN_VALIDATED: similar, but the implementation is tricky
3960 * - DECRYPTED: necessary for PN_VALIDATED
3963 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3966 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3969 if (unlikely(ieee80211_is_frag(hdr)))
3972 /* Since our interface address cannot be multicast, this
3973 * implicitly also rejects multicast frames without the
3976 * We shouldn't get any *data* frames not addressed to us
3977 * (AP mode will accept multicast *management* frames), but
3978 * punting here will make it go through the full checks in
3979 * ieee80211_accept_frame().
3981 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3984 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3985 IEEE80211_FCTL_TODS)) !=
3986 fast_rx->expected_ds_bits)
3989 /* assign the key to drop unencrypted frames (later)
3990 * and strip the IV/MIC if necessary
3992 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3993 /* GCMP header length is the same */
3994 snap_offs += IEEE80211_CCMP_HDR_LEN;
3997 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
3998 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4001 payload = (void *)(skb->data + snap_offs);
4003 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4006 /* Don't handle these here since they require special code.
4007 * Accept AARP and IPX even though they should come with a
4008 * bridge-tunnel header - but if we get them this way then
4009 * there's little point in discarding them.
4011 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4012 payload->proto == fast_rx->control_port_protocol))
4016 /* after this point, don't punt to the slowpath! */
4018 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4019 pskb_trim(skb, skb->len - fast_rx->icv_len))
4022 if (unlikely(fast_rx->sta_notify)) {
4023 ieee80211_sta_rx_notify(rx->sdata, hdr);
4024 fast_rx->sta_notify = false;
4027 /* statistics part of ieee80211_rx_h_sta_process() */
4028 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4029 stats->last_signal = status->signal;
4030 if (!fast_rx->uses_rss)
4031 ewma_signal_add(&sta->rx_stats_avg.signal,
4035 if (status->chains) {
4038 stats->chains = status->chains;
4039 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4040 int signal = status->chain_signal[i];
4042 if (!(status->chains & BIT(i)))
4045 stats->chain_signal_last[i] = signal;
4046 if (!fast_rx->uses_rss)
4047 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4051 /* end of statistics */
4053 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4056 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4057 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4064 stats->last_rx = jiffies;
4065 stats->last_rate = sta_stats_encode_rate(status);
4070 /* do the header conversion - first grab the addresses */
4071 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4072 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4073 /* remove the SNAP but leave the ethertype */
4074 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4075 /* push the addresses in front */
4076 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4078 skb->dev = fast_rx->dev;
4080 ieee80211_rx_stats(fast_rx->dev, skb->len);
4082 /* The seqno index has the same property as needed
4083 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4084 * for non-QoS-data frames. Here we know it's a data
4085 * frame, so count MSDUs.
4087 u64_stats_update_begin(&stats->syncp);
4088 stats->msdu[rx->seqno_idx]++;
4089 stats->bytes += orig_len;
4090 u64_stats_update_end(&stats->syncp);
4092 if (fast_rx->internal_forward) {
4093 struct sk_buff *xmit_skb = NULL;
4094 bool multicast = is_multicast_ether_addr(skb->data);
4097 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4098 } else if (sta_info_get(rx->sdata, skb->data)) {
4105 * Send to wireless media and increase priority by 256
4106 * to keep the received priority instead of
4107 * reclassifying the frame (see cfg80211_classify8021d).
4109 xmit_skb->priority += 256;
4110 xmit_skb->protocol = htons(ETH_P_802_3);
4111 skb_reset_network_header(xmit_skb);
4112 skb_reset_mac_header(xmit_skb);
4113 dev_queue_xmit(xmit_skb);
4120 /* deliver to local stack */
4121 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4122 memset(skb->cb, 0, sizeof(skb->cb));
4124 napi_gro_receive(rx->napi, skb);
4126 netif_receive_skb(skb);
4136 * This function returns whether or not the SKB
4137 * was destined for RX processing or not, which,
4138 * if consume is true, is equivalent to whether
4139 * or not the skb was consumed.
4141 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4142 struct sk_buff *skb, bool consume)
4144 struct ieee80211_local *local = rx->local;
4145 struct ieee80211_sub_if_data *sdata = rx->sdata;
4149 /* See if we can do fast-rx; if we have to copy we already lost,
4150 * so punt in that case. We should never have to deliver a data
4151 * frame to multiple interfaces anyway.
4153 * We skip the ieee80211_accept_frame() call and do the necessary
4154 * checking inside ieee80211_invoke_fast_rx().
4156 if (consume && rx->sta) {
4157 struct ieee80211_fast_rx *fast_rx;
4159 fast_rx = rcu_dereference(rx->sta->fast_rx);
4160 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4164 if (!ieee80211_accept_frame(rx))
4168 skb = skb_copy(skb, GFP_ATOMIC);
4170 if (net_ratelimit())
4171 wiphy_debug(local->hw.wiphy,
4172 "failed to copy skb for %s\n",
4180 ieee80211_invoke_rx_handlers(rx);
4185 * This is the actual Rx frames handler. as it belongs to Rx path it must
4186 * be called with rcu_read_lock protection.
4188 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4189 struct ieee80211_sta *pubsta,
4190 struct sk_buff *skb,
4191 struct napi_struct *napi)
4193 struct ieee80211_local *local = hw_to_local(hw);
4194 struct ieee80211_sub_if_data *sdata;
4195 struct ieee80211_hdr *hdr;
4197 struct ieee80211_rx_data rx;
4198 struct ieee80211_sub_if_data *prev;
4199 struct rhlist_head *tmp;
4202 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4203 memset(&rx, 0, sizeof(rx));
4208 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4209 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4211 if (ieee80211_is_mgmt(fc)) {
4212 /* drop frame if too short for header */
4213 if (skb->len < ieee80211_hdrlen(fc))
4216 err = skb_linearize(skb);
4218 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4226 hdr = (struct ieee80211_hdr *)skb->data;
4227 ieee80211_parse_qos(&rx);
4228 ieee80211_verify_alignment(&rx);
4230 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4231 ieee80211_is_beacon(hdr->frame_control)))
4232 ieee80211_scan_rx(local, skb);
4234 if (ieee80211_is_data(fc)) {
4235 struct sta_info *sta, *prev_sta;
4238 rx.sta = container_of(pubsta, struct sta_info, sta);
4239 rx.sdata = rx.sta->sdata;
4240 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4247 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4254 rx.sdata = prev_sta->sdata;
4255 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4262 rx.sdata = prev_sta->sdata;
4264 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4272 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4273 if (!ieee80211_sdata_running(sdata))
4276 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4277 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4281 * frame is destined for this interface, but if it's
4282 * not also for the previous one we handle that after
4283 * the loop to avoid copying the SKB once too much
4291 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4293 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4299 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4302 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4311 * This is the receive path handler. It is called by a low level driver when an
4312 * 802.11 MPDU is received from the hardware.
4314 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4315 struct sk_buff *skb, struct napi_struct *napi)
4317 struct ieee80211_local *local = hw_to_local(hw);
4318 struct ieee80211_rate *rate = NULL;
4319 struct ieee80211_supported_band *sband;
4320 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4322 WARN_ON_ONCE(softirq_count() == 0);
4324 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4327 sband = local->hw.wiphy->bands[status->band];
4328 if (WARN_ON(!sband))
4332 * If we're suspending, it is possible although not too likely
4333 * that we'd be receiving frames after having already partially
4334 * quiesced the stack. We can't process such frames then since
4335 * that might, for example, cause stations to be added or other
4336 * driver callbacks be invoked.
4338 if (unlikely(local->quiescing || local->suspended))
4341 /* We might be during a HW reconfig, prevent Rx for the same reason */
4342 if (unlikely(local->in_reconfig))
4346 * The same happens when we're not even started,
4347 * but that's worth a warning.
4349 if (WARN_ON(!local->started))
4352 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4354 * Validate the rate, unless a PLCP error means that
4355 * we probably can't have a valid rate here anyway.
4358 switch (status->encoding) {
4361 * rate_idx is MCS index, which can be [0-76]
4364 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4366 * Anything else would be some sort of driver or
4367 * hardware error. The driver should catch hardware
4370 if (WARN(status->rate_idx > 76,
4371 "Rate marked as an HT rate but passed "
4372 "status->rate_idx is not "
4373 "an MCS index [0-76]: %d (0x%02x)\n",
4379 if (WARN_ONCE(status->rate_idx > 9 ||
4382 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4383 status->rate_idx, status->nss))
4390 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4392 rate = &sband->bitrates[status->rate_idx];
4396 status->rx_flags = 0;
4399 * key references and virtual interfaces are protected using RCU
4400 * and this requires that we are in a read-side RCU section during
4401 * receive processing
4406 * Frames with failed FCS/PLCP checksum are not returned,
4407 * all other frames are returned without radiotap header
4408 * if it was previously present.
4409 * Also, frames with less than 16 bytes are dropped.
4411 skb = ieee80211_rx_monitor(local, skb, rate);
4417 ieee80211_tpt_led_trig_rx(local,
4418 ((struct ieee80211_hdr *)skb->data)->frame_control,
4421 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4429 EXPORT_SYMBOL(ieee80211_rx_napi);
4431 /* This is a version of the rx handler that can be called from hard irq
4432 * context. Post the skb on the queue and schedule the tasklet */
4433 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4435 struct ieee80211_local *local = hw_to_local(hw);
4437 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4439 skb->pkt_type = IEEE80211_RX_MSG;
4440 skb_queue_tail(&local->skb_queue, skb);
4441 tasklet_schedule(&local->tasklet);
4443 EXPORT_SYMBOL(ieee80211_rx_irqsafe);