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) 2018-2019 Intel Corporation
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/jiffies.h>
16 #include <linux/slab.h>
17 #include <linux/kernel.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <linux/bitops.h>
24 #include <net/mac80211.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
40 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
42 u64_stats_update_begin(&tstats->syncp);
44 tstats->rx_bytes += len;
45 u64_stats_update_end(&tstats->syncp);
48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49 enum nl80211_iftype type)
51 __le16 fc = hdr->frame_control;
53 if (ieee80211_is_data(fc)) {
54 if (len < 24) /* drop incorrect hdr len (data) */
57 if (ieee80211_has_a4(fc))
59 if (ieee80211_has_tods(fc))
61 if (ieee80211_has_fromds(fc))
67 if (ieee80211_is_mgmt(fc)) {
68 if (len < 24) /* drop incorrect hdr len (mgmt) */
73 if (ieee80211_is_ctl(fc)) {
74 if (ieee80211_is_pspoll(fc))
77 if (ieee80211_is_back_req(fc)) {
79 case NL80211_IFTYPE_STATION:
81 case NL80211_IFTYPE_AP:
82 case NL80211_IFTYPE_AP_VLAN:
85 break; /* fall through to the return */
94 * monitor mode reception
96 * This function cleans up the SKB, i.e. it removes all the stuff
97 * only useful for monitoring.
99 static void remove_monitor_info(struct sk_buff *skb,
100 unsigned int present_fcs_len,
101 unsigned int rtap_space)
104 __pskb_trim(skb, skb->len - present_fcs_len);
105 __pskb_pull(skb, rtap_space);
108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
109 unsigned int rtap_space)
111 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
112 struct ieee80211_hdr *hdr;
114 hdr = (void *)(skb->data + rtap_space);
116 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
117 RX_FLAG_FAILED_PLCP_CRC |
118 RX_FLAG_ONLY_MONITOR |
122 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
125 if (ieee80211_is_ctl(hdr->frame_control) &&
126 !ieee80211_is_pspoll(hdr->frame_control) &&
127 !ieee80211_is_back_req(hdr->frame_control))
134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
135 struct ieee80211_rx_status *status,
140 /* always present fields */
141 len = sizeof(struct ieee80211_radiotap_header) + 8;
143 /* allocate extra bitmaps */
145 len += 4 * hweight8(status->chains);
146 /* vendor presence bitmap */
147 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
150 if (ieee80211_have_rx_timestamp(status)) {
154 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
157 /* antenna field, if we don't have per-chain info */
161 /* padding for RX_FLAGS if necessary */
164 if (status->encoding == RX_ENC_HT) /* HT info */
167 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
172 if (status->encoding == RX_ENC_VHT) {
177 if (local->hw.radiotap_timestamp.units_pos >= 0) {
182 if (status->encoding == RX_ENC_HE &&
183 status->flag & RX_FLAG_RADIOTAP_HE) {
186 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
189 if (status->encoding == RX_ENC_HE &&
190 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
193 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
196 if (status->flag & RX_FLAG_NO_PSDU)
199 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
202 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
205 if (status->chains) {
206 /* antenna and antenna signal fields */
207 len += 2 * hweight8(status->chains);
210 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
211 struct ieee80211_vendor_radiotap *rtap;
212 int vendor_data_offset = 0;
215 * The position to look at depends on the existence (or non-
216 * existence) of other elements, so take that into account...
218 if (status->flag & RX_FLAG_RADIOTAP_HE)
219 vendor_data_offset +=
220 sizeof(struct ieee80211_radiotap_he);
221 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
222 vendor_data_offset +=
223 sizeof(struct ieee80211_radiotap_he_mu);
224 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
225 vendor_data_offset +=
226 sizeof(struct ieee80211_radiotap_lsig);
228 rtap = (void *)&skb->data[vendor_data_offset];
230 /* alignment for fixed 6-byte vendor data header */
232 /* vendor data header */
234 if (WARN_ON(rtap->align == 0))
236 len = ALIGN(len, rtap->align);
237 len += rtap->len + rtap->pad;
243 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
248 struct ieee80211_hdr_3addr hdr;
251 } __packed __aligned(2) action;
256 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
258 if (skb->len < rtap_space + sizeof(action) +
259 VHT_MUMIMO_GROUPS_DATA_LEN)
262 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
265 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
267 if (!ieee80211_is_action(action.hdr.frame_control))
270 if (action.category != WLAN_CATEGORY_VHT)
273 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
276 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
279 skb = skb_copy(skb, GFP_ATOMIC);
283 skb_queue_tail(&sdata->skb_queue, skb);
284 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
288 * ieee80211_add_rx_radiotap_header - add radiotap header
290 * add a radiotap header containing all the fields which the hardware provided.
293 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
295 struct ieee80211_rate *rate,
296 int rtap_len, bool has_fcs)
298 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
299 struct ieee80211_radiotap_header *rthdr;
304 u16 channel_flags = 0;
306 unsigned long chains = status->chains;
307 struct ieee80211_vendor_radiotap rtap = {};
308 struct ieee80211_radiotap_he he = {};
309 struct ieee80211_radiotap_he_mu he_mu = {};
310 struct ieee80211_radiotap_lsig lsig = {};
312 if (status->flag & RX_FLAG_RADIOTAP_HE) {
313 he = *(struct ieee80211_radiotap_he *)skb->data;
314 skb_pull(skb, sizeof(he));
315 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
318 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
319 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
320 skb_pull(skb, sizeof(he_mu));
323 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
324 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
325 skb_pull(skb, sizeof(lsig));
328 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
329 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
330 /* rtap.len and rtap.pad are undone immediately */
331 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
335 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
338 rthdr = skb_push(skb, rtap_len);
339 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
340 it_present = &rthdr->it_present;
342 /* radiotap header, set always present flags */
343 rthdr->it_len = cpu_to_le16(rtap_len);
344 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
345 BIT(IEEE80211_RADIOTAP_CHANNEL) |
346 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
349 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
351 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
353 BIT(IEEE80211_RADIOTAP_EXT) |
354 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
355 put_unaligned_le32(it_present_val, it_present);
357 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
358 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
361 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
362 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
363 BIT(IEEE80211_RADIOTAP_EXT);
364 put_unaligned_le32(it_present_val, it_present);
366 it_present_val = rtap.present;
369 put_unaligned_le32(it_present_val, it_present);
371 pos = (void *)(it_present + 1);
373 /* the order of the following fields is important */
375 /* IEEE80211_RADIOTAP_TSFT */
376 if (ieee80211_have_rx_timestamp(status)) {
378 while ((pos - (u8 *)rthdr) & 7)
381 ieee80211_calculate_rx_timestamp(local, status,
384 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
388 /* IEEE80211_RADIOTAP_FLAGS */
389 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
390 *pos |= IEEE80211_RADIOTAP_F_FCS;
391 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
392 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
393 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
394 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
397 /* IEEE80211_RADIOTAP_RATE */
398 if (!rate || status->encoding != RX_ENC_LEGACY) {
400 * Without rate information don't add it. If we have,
401 * MCS information is a separate field in radiotap,
402 * added below. The byte here is needed as padding
403 * for the channel though, so initialise it to 0.
408 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
409 if (status->bw == RATE_INFO_BW_10)
411 else if (status->bw == RATE_INFO_BW_5)
413 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
417 /* IEEE80211_RADIOTAP_CHANNEL */
418 put_unaligned_le16(status->freq, pos);
420 if (status->bw == RATE_INFO_BW_10)
421 channel_flags |= IEEE80211_CHAN_HALF;
422 else if (status->bw == RATE_INFO_BW_5)
423 channel_flags |= IEEE80211_CHAN_QUARTER;
425 if (status->band == NL80211_BAND_5GHZ)
426 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
427 else if (status->encoding != RX_ENC_LEGACY)
428 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
429 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
430 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
432 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
434 channel_flags |= IEEE80211_CHAN_2GHZ;
435 put_unaligned_le16(channel_flags, pos);
438 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
439 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
440 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
441 *pos = status->signal;
443 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
447 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
449 if (!status->chains) {
450 /* IEEE80211_RADIOTAP_ANTENNA */
451 *pos = status->antenna;
455 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
457 /* IEEE80211_RADIOTAP_RX_FLAGS */
458 /* ensure 2 byte alignment for the 2 byte field as required */
459 if ((pos - (u8 *)rthdr) & 1)
461 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
462 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
463 put_unaligned_le16(rx_flags, pos);
466 if (status->encoding == RX_ENC_HT) {
469 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
470 *pos++ = local->hw.radiotap_mcs_details;
472 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
473 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
474 if (status->bw == RATE_INFO_BW_40)
475 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
476 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
477 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
478 if (status->enc_flags & RX_ENC_FLAG_LDPC)
479 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
480 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
481 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
483 *pos++ = status->rate_idx;
486 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
489 /* ensure 4 byte alignment */
490 while ((pos - (u8 *)rthdr) & 3)
493 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
494 put_unaligned_le32(status->ampdu_reference, pos);
496 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
497 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
498 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
499 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
500 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
501 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
502 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
503 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
504 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
505 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
506 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
507 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
508 put_unaligned_le16(flags, pos);
510 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
511 *pos++ = status->ampdu_delimiter_crc;
517 if (status->encoding == RX_ENC_VHT) {
518 u16 known = local->hw.radiotap_vht_details;
520 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
521 put_unaligned_le16(known, pos);
524 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
525 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
526 /* in VHT, STBC is binary */
527 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
528 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
529 if (status->enc_flags & RX_ENC_FLAG_BF)
530 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
533 switch (status->bw) {
534 case RATE_INFO_BW_80:
537 case RATE_INFO_BW_160:
540 case RATE_INFO_BW_40:
547 *pos = (status->rate_idx << 4) | status->nss;
550 if (status->enc_flags & RX_ENC_FLAG_LDPC)
551 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
559 if (local->hw.radiotap_timestamp.units_pos >= 0) {
561 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
564 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
566 /* ensure 8 byte alignment */
567 while ((pos - (u8 *)rthdr) & 7)
570 put_unaligned_le64(status->device_timestamp, pos);
573 if (local->hw.radiotap_timestamp.accuracy >= 0) {
574 accuracy = local->hw.radiotap_timestamp.accuracy;
575 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
577 put_unaligned_le16(accuracy, pos);
580 *pos++ = local->hw.radiotap_timestamp.units_pos;
584 if (status->encoding == RX_ENC_HE &&
585 status->flag & RX_FLAG_RADIOTAP_HE) {
586 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
588 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
589 he.data6 |= HE_PREP(DATA6_NSTS,
590 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
592 he.data3 |= HE_PREP(DATA3_STBC, 1);
594 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
597 #define CHECK_GI(s) \
598 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
599 (int)NL80211_RATE_INFO_HE_GI_##s)
605 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
606 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
607 he.data3 |= HE_PREP(DATA3_CODING,
608 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
610 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
612 switch (status->bw) {
613 case RATE_INFO_BW_20:
614 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
615 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
617 case RATE_INFO_BW_40:
618 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
619 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
621 case RATE_INFO_BW_80:
622 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
623 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
625 case RATE_INFO_BW_160:
626 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
627 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
629 case RATE_INFO_BW_HE_RU:
630 #define CHECK_RU_ALLOC(s) \
631 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
632 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
640 CHECK_RU_ALLOC(2x996);
642 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
646 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
649 /* ensure 2 byte alignment */
650 while ((pos - (u8 *)rthdr) & 1)
652 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
653 memcpy(pos, &he, sizeof(he));
657 if (status->encoding == RX_ENC_HE &&
658 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
659 /* ensure 2 byte alignment */
660 while ((pos - (u8 *)rthdr) & 1)
662 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
663 memcpy(pos, &he_mu, sizeof(he_mu));
664 pos += sizeof(he_mu);
667 if (status->flag & RX_FLAG_NO_PSDU) {
669 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
670 *pos++ = status->zero_length_psdu_type;
673 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
674 /* ensure 2 byte alignment */
675 while ((pos - (u8 *)rthdr) & 1)
677 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
678 memcpy(pos, &lsig, sizeof(lsig));
682 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
683 *pos++ = status->chain_signal[chain];
687 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
688 /* ensure 2 byte alignment for the vendor field as required */
689 if ((pos - (u8 *)rthdr) & 1)
691 *pos++ = rtap.oui[0];
692 *pos++ = rtap.oui[1];
693 *pos++ = rtap.oui[2];
695 put_unaligned_le16(rtap.len, pos);
697 /* align the actual payload as requested */
698 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
700 /* data (and possible padding) already follows */
704 static struct sk_buff *
705 ieee80211_make_monitor_skb(struct ieee80211_local *local,
706 struct sk_buff **origskb,
707 struct ieee80211_rate *rate,
708 int rtap_space, bool use_origskb)
710 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
711 int rt_hdrlen, needed_headroom;
714 /* room for the radiotap header based on driver features */
715 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
716 needed_headroom = rt_hdrlen - rtap_space;
719 /* only need to expand headroom if necessary */
724 * This shouldn't trigger often because most devices have an
725 * RX header they pull before we get here, and that should
726 * be big enough for our radiotap information. We should
727 * probably export the length to drivers so that we can have
728 * them allocate enough headroom to start with.
730 if (skb_headroom(skb) < needed_headroom &&
731 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
737 * Need to make a copy and possibly remove radiotap header
738 * and FCS from the original.
740 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
746 /* prepend radiotap information */
747 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
749 skb_reset_mac_header(skb);
750 skb->ip_summed = CHECKSUM_UNNECESSARY;
751 skb->pkt_type = PACKET_OTHERHOST;
752 skb->protocol = htons(ETH_P_802_2);
758 * This function copies a received frame to all monitor interfaces and
759 * returns a cleaned-up SKB that no longer includes the FCS nor the
760 * radiotap header the driver might have added.
762 static struct sk_buff *
763 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
764 struct ieee80211_rate *rate)
766 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
767 struct ieee80211_sub_if_data *sdata;
768 struct sk_buff *monskb = NULL;
769 int present_fcs_len = 0;
770 unsigned int rtap_space = 0;
771 struct ieee80211_sub_if_data *monitor_sdata =
772 rcu_dereference(local->monitor_sdata);
773 bool only_monitor = false;
774 unsigned int min_head_len;
776 if (status->flag & RX_FLAG_RADIOTAP_HE)
777 rtap_space += sizeof(struct ieee80211_radiotap_he);
779 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
780 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
782 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
783 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
785 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
786 struct ieee80211_vendor_radiotap *rtap =
787 (void *)(origskb->data + rtap_space);
789 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
792 min_head_len = rtap_space;
795 * First, we may need to make a copy of the skb because
796 * (1) we need to modify it for radiotap (if not present), and
797 * (2) the other RX handlers will modify the skb we got.
799 * We don't need to, of course, if we aren't going to return
800 * the SKB because it has a bad FCS/PLCP checksum.
803 if (!(status->flag & RX_FLAG_NO_PSDU)) {
804 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
805 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
808 dev_kfree_skb(origskb);
811 present_fcs_len = FCS_LEN;
814 /* also consider the hdr->frame_control */
818 /* ensure that the expected data elements are in skb head */
819 if (!pskb_may_pull(origskb, min_head_len)) {
820 dev_kfree_skb(origskb);
824 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
826 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
828 dev_kfree_skb(origskb);
832 remove_monitor_info(origskb, present_fcs_len, rtap_space);
836 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
838 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
839 bool last_monitor = list_is_last(&sdata->u.mntr.list,
843 monskb = ieee80211_make_monitor_skb(local, &origskb,
855 skb = skb_clone(monskb, GFP_ATOMIC);
859 skb->dev = sdata->dev;
860 ieee80211_rx_stats(skb->dev, skb->len);
861 netif_receive_skb(skb);
869 /* this happens if last_monitor was erroneously false */
870 dev_kfree_skb(monskb);
876 remove_monitor_info(origskb, present_fcs_len, rtap_space);
880 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
882 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
883 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
884 int tid, seqno_idx, security_idx;
886 /* does the frame have a qos control field? */
887 if (ieee80211_is_data_qos(hdr->frame_control)) {
888 u8 *qc = ieee80211_get_qos_ctl(hdr);
889 /* frame has qos control */
890 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
891 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
892 status->rx_flags |= IEEE80211_RX_AMSDU;
898 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
900 * Sequence numbers for management frames, QoS data
901 * frames with a broadcast/multicast address in the
902 * Address 1 field, and all non-QoS data frames sent
903 * by QoS STAs are assigned using an additional single
904 * modulo-4096 counter, [...]
906 * We also use that counter for non-QoS STAs.
908 seqno_idx = IEEE80211_NUM_TIDS;
910 if (ieee80211_is_mgmt(hdr->frame_control))
911 security_idx = IEEE80211_NUM_TIDS;
915 rx->seqno_idx = seqno_idx;
916 rx->security_idx = security_idx;
917 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
918 * For now, set skb->priority to 0 for other cases. */
919 rx->skb->priority = (tid > 7) ? 0 : tid;
923 * DOC: Packet alignment
925 * Drivers always need to pass packets that are aligned to two-byte boundaries
928 * Additionally, should, if possible, align the payload data in a way that
929 * guarantees that the contained IP header is aligned to a four-byte
930 * boundary. In the case of regular frames, this simply means aligning the
931 * payload to a four-byte boundary (because either the IP header is directly
932 * contained, or IV/RFC1042 headers that have a length divisible by four are
933 * in front of it). If the payload data is not properly aligned and the
934 * architecture doesn't support efficient unaligned operations, mac80211
935 * will align the data.
937 * With A-MSDU frames, however, the payload data address must yield two modulo
938 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
939 * push the IP header further back to a multiple of four again. Thankfully, the
940 * specs were sane enough this time around to require padding each A-MSDU
941 * subframe to a length that is a multiple of four.
943 * Padding like Atheros hardware adds which is between the 802.11 header and
944 * the payload is not supported, the driver is required to move the 802.11
945 * header to be directly in front of the payload in that case.
947 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
949 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
950 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
957 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
959 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
961 if (is_multicast_ether_addr(hdr->addr1))
964 return ieee80211_is_robust_mgmt_frame(skb);
968 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
970 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
972 if (!is_multicast_ether_addr(hdr->addr1))
975 return ieee80211_is_robust_mgmt_frame(skb);
979 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
980 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
982 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
983 struct ieee80211_mmie *mmie;
984 struct ieee80211_mmie_16 *mmie16;
986 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
989 if (!ieee80211_is_robust_mgmt_frame(skb))
990 return -1; /* not a robust management frame */
992 mmie = (struct ieee80211_mmie *)
993 (skb->data + skb->len - sizeof(*mmie));
994 if (mmie->element_id == WLAN_EID_MMIE &&
995 mmie->length == sizeof(*mmie) - 2)
996 return le16_to_cpu(mmie->key_id);
998 mmie16 = (struct ieee80211_mmie_16 *)
999 (skb->data + skb->len - sizeof(*mmie16));
1000 if (skb->len >= 24 + sizeof(*mmie16) &&
1001 mmie16->element_id == WLAN_EID_MMIE &&
1002 mmie16->length == sizeof(*mmie16) - 2)
1003 return le16_to_cpu(mmie16->key_id);
1008 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
1009 struct sk_buff *skb)
1011 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1016 fc = hdr->frame_control;
1017 hdrlen = ieee80211_hdrlen(fc);
1019 if (skb->len < hdrlen + cs->hdr_len)
1022 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
1023 keyid &= cs->key_idx_mask;
1024 keyid >>= cs->key_idx_shift;
1029 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1031 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1032 char *dev_addr = rx->sdata->vif.addr;
1034 if (ieee80211_is_data(hdr->frame_control)) {
1035 if (is_multicast_ether_addr(hdr->addr1)) {
1036 if (ieee80211_has_tods(hdr->frame_control) ||
1037 !ieee80211_has_fromds(hdr->frame_control))
1038 return RX_DROP_MONITOR;
1039 if (ether_addr_equal(hdr->addr3, dev_addr))
1040 return RX_DROP_MONITOR;
1042 if (!ieee80211_has_a4(hdr->frame_control))
1043 return RX_DROP_MONITOR;
1044 if (ether_addr_equal(hdr->addr4, dev_addr))
1045 return RX_DROP_MONITOR;
1049 /* If there is not an established peer link and this is not a peer link
1050 * establisment frame, beacon or probe, drop the frame.
1053 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1054 struct ieee80211_mgmt *mgmt;
1056 if (!ieee80211_is_mgmt(hdr->frame_control))
1057 return RX_DROP_MONITOR;
1059 if (ieee80211_is_action(hdr->frame_control)) {
1062 /* make sure category field is present */
1063 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1064 return RX_DROP_MONITOR;
1066 mgmt = (struct ieee80211_mgmt *)hdr;
1067 category = mgmt->u.action.category;
1068 if (category != WLAN_CATEGORY_MESH_ACTION &&
1069 category != WLAN_CATEGORY_SELF_PROTECTED)
1070 return RX_DROP_MONITOR;
1074 if (ieee80211_is_probe_req(hdr->frame_control) ||
1075 ieee80211_is_probe_resp(hdr->frame_control) ||
1076 ieee80211_is_beacon(hdr->frame_control) ||
1077 ieee80211_is_auth(hdr->frame_control))
1080 return RX_DROP_MONITOR;
1086 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1089 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1090 struct sk_buff *tail = skb_peek_tail(frames);
1091 struct ieee80211_rx_status *status;
1093 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1099 status = IEEE80211_SKB_RXCB(tail);
1100 if (status->flag & RX_FLAG_AMSDU_MORE)
1106 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1107 struct tid_ampdu_rx *tid_agg_rx,
1109 struct sk_buff_head *frames)
1111 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1112 struct sk_buff *skb;
1113 struct ieee80211_rx_status *status;
1115 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1117 if (skb_queue_empty(skb_list))
1120 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1121 __skb_queue_purge(skb_list);
1125 /* release frames from the reorder ring buffer */
1126 tid_agg_rx->stored_mpdu_num--;
1127 while ((skb = __skb_dequeue(skb_list))) {
1128 status = IEEE80211_SKB_RXCB(skb);
1129 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1130 __skb_queue_tail(frames, skb);
1134 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1135 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1138 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1139 struct tid_ampdu_rx *tid_agg_rx,
1141 struct sk_buff_head *frames)
1145 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1147 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1148 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1149 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1155 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1156 * the skb was added to the buffer longer than this time ago, the earlier
1157 * frames that have not yet been received are assumed to be lost and the skb
1158 * can be released for processing. This may also release other skb's from the
1159 * reorder buffer if there are no additional gaps between the frames.
1161 * Callers must hold tid_agg_rx->reorder_lock.
1163 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1165 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1166 struct tid_ampdu_rx *tid_agg_rx,
1167 struct sk_buff_head *frames)
1171 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1173 /* release the buffer until next missing frame */
1174 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1175 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1176 tid_agg_rx->stored_mpdu_num) {
1178 * No buffers ready to be released, but check whether any
1179 * frames in the reorder buffer have timed out.
1182 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1183 j = (j + 1) % tid_agg_rx->buf_size) {
1184 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1189 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1190 HT_RX_REORDER_BUF_TIMEOUT))
1191 goto set_release_timer;
1193 /* don't leave incomplete A-MSDUs around */
1194 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1195 i = (i + 1) % tid_agg_rx->buf_size)
1196 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1198 ht_dbg_ratelimited(sdata,
1199 "release an RX reorder frame due to timeout on earlier frames\n");
1200 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1204 * Increment the head seq# also for the skipped slots.
1206 tid_agg_rx->head_seq_num =
1207 (tid_agg_rx->head_seq_num +
1208 skipped) & IEEE80211_SN_MASK;
1211 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1212 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1214 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1217 if (tid_agg_rx->stored_mpdu_num) {
1218 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1220 for (; j != (index - 1) % tid_agg_rx->buf_size;
1221 j = (j + 1) % tid_agg_rx->buf_size) {
1222 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1228 if (!tid_agg_rx->removed)
1229 mod_timer(&tid_agg_rx->reorder_timer,
1230 tid_agg_rx->reorder_time[j] + 1 +
1231 HT_RX_REORDER_BUF_TIMEOUT);
1233 del_timer(&tid_agg_rx->reorder_timer);
1238 * As this function belongs to the RX path it must be under
1239 * rcu_read_lock protection. It returns false if the frame
1240 * can be processed immediately, true if it was consumed.
1242 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1243 struct tid_ampdu_rx *tid_agg_rx,
1244 struct sk_buff *skb,
1245 struct sk_buff_head *frames)
1247 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1248 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1249 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1250 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1251 u16 head_seq_num, buf_size;
1255 spin_lock(&tid_agg_rx->reorder_lock);
1258 * Offloaded BA sessions have no known starting sequence number so pick
1259 * one from first Rxed frame for this tid after BA was started.
1261 if (unlikely(tid_agg_rx->auto_seq)) {
1262 tid_agg_rx->auto_seq = false;
1263 tid_agg_rx->ssn = mpdu_seq_num;
1264 tid_agg_rx->head_seq_num = mpdu_seq_num;
1267 buf_size = tid_agg_rx->buf_size;
1268 head_seq_num = tid_agg_rx->head_seq_num;
1271 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1274 if (unlikely(!tid_agg_rx->started)) {
1275 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1279 tid_agg_rx->started = true;
1282 /* frame with out of date sequence number */
1283 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1289 * If frame the sequence number exceeds our buffering window
1290 * size release some previous frames to make room for this one.
1292 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1293 head_seq_num = ieee80211_sn_inc(
1294 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1295 /* release stored frames up to new head to stack */
1296 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1297 head_seq_num, frames);
1300 /* Now the new frame is always in the range of the reordering buffer */
1302 index = mpdu_seq_num % tid_agg_rx->buf_size;
1304 /* check if we already stored this frame */
1305 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1311 * If the current MPDU is in the right order and nothing else
1312 * is stored we can process it directly, no need to buffer it.
1313 * If it is first but there's something stored, we may be able
1314 * to release frames after this one.
1316 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1317 tid_agg_rx->stored_mpdu_num == 0) {
1318 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1319 tid_agg_rx->head_seq_num =
1320 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1325 /* put the frame in the reordering buffer */
1326 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1327 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1328 tid_agg_rx->reorder_time[index] = jiffies;
1329 tid_agg_rx->stored_mpdu_num++;
1330 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1334 spin_unlock(&tid_agg_rx->reorder_lock);
1339 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1340 * true if the MPDU was buffered, false if it should be processed.
1342 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1343 struct sk_buff_head *frames)
1345 struct sk_buff *skb = rx->skb;
1346 struct ieee80211_local *local = rx->local;
1347 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1348 struct sta_info *sta = rx->sta;
1349 struct tid_ampdu_rx *tid_agg_rx;
1353 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1354 is_multicast_ether_addr(hdr->addr1))
1358 * filter the QoS data rx stream according to
1359 * STA/TID and check if this STA/TID is on aggregation
1365 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1366 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1367 tid = ieee80211_get_tid(hdr);
1369 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1371 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1372 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1373 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1374 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1375 WLAN_BACK_RECIPIENT,
1376 WLAN_REASON_QSTA_REQUIRE_SETUP);
1380 /* qos null data frames are excluded */
1381 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1384 /* not part of a BA session */
1385 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1386 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1389 /* new, potentially un-ordered, ampdu frame - process it */
1391 /* reset session timer */
1392 if (tid_agg_rx->timeout)
1393 tid_agg_rx->last_rx = jiffies;
1395 /* if this mpdu is fragmented - terminate rx aggregation session */
1396 sc = le16_to_cpu(hdr->seq_ctrl);
1397 if (sc & IEEE80211_SCTL_FRAG) {
1398 skb_queue_tail(&rx->sdata->skb_queue, skb);
1399 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1404 * No locking needed -- we will only ever process one
1405 * RX packet at a time, and thus own tid_agg_rx. All
1406 * other code manipulating it needs to (and does) make
1407 * sure that we cannot get to it any more before doing
1410 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1415 __skb_queue_tail(frames, skb);
1418 static ieee80211_rx_result debug_noinline
1419 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1421 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1422 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1424 if (status->flag & RX_FLAG_DUP_VALIDATED)
1428 * Drop duplicate 802.11 retransmissions
1429 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1432 if (rx->skb->len < 24)
1435 if (ieee80211_is_ctl(hdr->frame_control) ||
1436 ieee80211_is_nullfunc(hdr->frame_control) ||
1437 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1438 is_multicast_ether_addr(hdr->addr1))
1444 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1445 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1446 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1447 rx->sta->rx_stats.num_duplicates++;
1448 return RX_DROP_UNUSABLE;
1449 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1450 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1456 static ieee80211_rx_result debug_noinline
1457 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1461 /* Drop disallowed frame classes based on STA auth/assoc state;
1462 * IEEE 802.11, Chap 5.5.
1464 * mac80211 filters only based on association state, i.e. it drops
1465 * Class 3 frames from not associated stations. hostapd sends
1466 * deauth/disassoc frames when needed. In addition, hostapd is
1467 * responsible for filtering on both auth and assoc states.
1470 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1471 return ieee80211_rx_mesh_check(rx);
1473 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1474 ieee80211_is_pspoll(hdr->frame_control)) &&
1475 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1476 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1477 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1478 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1480 * accept port control frames from the AP even when it's not
1481 * yet marked ASSOC to prevent a race where we don't set the
1482 * assoc bit quickly enough before it sends the first frame
1484 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1485 ieee80211_is_data_present(hdr->frame_control)) {
1486 unsigned int hdrlen;
1489 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1491 if (rx->skb->len < hdrlen + 8)
1492 return RX_DROP_MONITOR;
1494 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1495 if (ethertype == rx->sdata->control_port_protocol)
1499 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1500 cfg80211_rx_spurious_frame(rx->sdata->dev,
1503 return RX_DROP_UNUSABLE;
1505 return RX_DROP_MONITOR;
1512 static ieee80211_rx_result debug_noinline
1513 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1515 struct ieee80211_local *local;
1516 struct ieee80211_hdr *hdr;
1517 struct sk_buff *skb;
1521 hdr = (struct ieee80211_hdr *) skb->data;
1523 if (!local->pspolling)
1526 if (!ieee80211_has_fromds(hdr->frame_control))
1527 /* this is not from AP */
1530 if (!ieee80211_is_data(hdr->frame_control))
1533 if (!ieee80211_has_moredata(hdr->frame_control)) {
1534 /* AP has no more frames buffered for us */
1535 local->pspolling = false;
1539 /* more data bit is set, let's request a new frame from the AP */
1540 ieee80211_send_pspoll(local, rx->sdata);
1545 static void sta_ps_start(struct sta_info *sta)
1547 struct ieee80211_sub_if_data *sdata = sta->sdata;
1548 struct ieee80211_local *local = sdata->local;
1552 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1553 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1554 ps = &sdata->bss->ps;
1558 atomic_inc(&ps->num_sta_ps);
1559 set_sta_flag(sta, WLAN_STA_PS_STA);
1560 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1561 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1562 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1563 sta->sta.addr, sta->sta.aid);
1565 ieee80211_clear_fast_xmit(sta);
1567 if (!sta->sta.txq[0])
1570 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1571 struct ieee80211_txq *txq = sta->sta.txq[tid];
1572 struct txq_info *txqi = to_txq_info(txq);
1574 spin_lock(&local->active_txq_lock[txq->ac]);
1575 if (!list_empty(&txqi->schedule_order))
1576 list_del_init(&txqi->schedule_order);
1577 spin_unlock(&local->active_txq_lock[txq->ac]);
1579 if (txq_has_queue(txq))
1580 set_bit(tid, &sta->txq_buffered_tids);
1582 clear_bit(tid, &sta->txq_buffered_tids);
1586 static void sta_ps_end(struct sta_info *sta)
1588 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1589 sta->sta.addr, sta->sta.aid);
1591 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1593 * Clear the flag only if the other one is still set
1594 * so that the TX path won't start TX'ing new frames
1595 * directly ... In the case that the driver flag isn't
1596 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1598 clear_sta_flag(sta, WLAN_STA_PS_STA);
1599 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1600 sta->sta.addr, sta->sta.aid);
1604 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1605 clear_sta_flag(sta, WLAN_STA_PS_STA);
1606 ieee80211_sta_ps_deliver_wakeup(sta);
1609 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1611 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1614 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1616 /* Don't let the same PS state be set twice */
1617 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1618 if ((start && in_ps) || (!start && !in_ps))
1628 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1630 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1632 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1634 if (test_sta_flag(sta, WLAN_STA_SP))
1637 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1638 ieee80211_sta_ps_deliver_poll_response(sta);
1640 set_sta_flag(sta, WLAN_STA_PSPOLL);
1642 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1644 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1646 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1647 int ac = ieee80211_ac_from_tid(tid);
1650 * If this AC is not trigger-enabled do nothing unless the
1651 * driver is calling us after it already checked.
1653 * NB: This could/should check a separate bitmap of trigger-
1654 * enabled queues, but for now we only implement uAPSD w/o
1655 * TSPEC changes to the ACs, so they're always the same.
1657 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1658 tid != IEEE80211_NUM_TIDS)
1661 /* if we are in a service period, do nothing */
1662 if (test_sta_flag(sta, WLAN_STA_SP))
1665 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1666 ieee80211_sta_ps_deliver_uapsd(sta);
1668 set_sta_flag(sta, WLAN_STA_UAPSD);
1670 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1672 static ieee80211_rx_result debug_noinline
1673 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1675 struct ieee80211_sub_if_data *sdata = rx->sdata;
1676 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1677 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1682 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1683 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1687 * The device handles station powersave, so don't do anything about
1688 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1689 * it to mac80211 since they're handled.)
1691 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1695 * Don't do anything if the station isn't already asleep. In
1696 * the uAPSD case, the station will probably be marked asleep,
1697 * in the PS-Poll case the station must be confused ...
1699 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1702 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1703 ieee80211_sta_pspoll(&rx->sta->sta);
1705 /* Free PS Poll skb here instead of returning RX_DROP that would
1706 * count as an dropped frame. */
1707 dev_kfree_skb(rx->skb);
1710 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1711 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1712 ieee80211_has_pm(hdr->frame_control) &&
1713 (ieee80211_is_data_qos(hdr->frame_control) ||
1714 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1715 u8 tid = ieee80211_get_tid(hdr);
1717 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1723 static ieee80211_rx_result debug_noinline
1724 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1726 struct sta_info *sta = rx->sta;
1727 struct sk_buff *skb = rx->skb;
1728 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1729 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1736 * Update last_rx only for IBSS packets which are for the current
1737 * BSSID and for station already AUTHORIZED to avoid keeping the
1738 * current IBSS network alive in cases where other STAs start
1739 * using different BSSID. This will also give the station another
1740 * chance to restart the authentication/authorization in case
1741 * something went wrong the first time.
1743 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1744 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1745 NL80211_IFTYPE_ADHOC);
1746 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1747 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1748 sta->rx_stats.last_rx = jiffies;
1749 if (ieee80211_is_data(hdr->frame_control) &&
1750 !is_multicast_ether_addr(hdr->addr1))
1751 sta->rx_stats.last_rate =
1752 sta_stats_encode_rate(status);
1754 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1755 sta->rx_stats.last_rx = jiffies;
1756 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1758 * Mesh beacons will update last_rx when if they are found to
1759 * match the current local configuration when processed.
1761 sta->rx_stats.last_rx = jiffies;
1762 if (ieee80211_is_data(hdr->frame_control))
1763 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1766 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1767 ieee80211_sta_rx_notify(rx->sdata, hdr);
1769 sta->rx_stats.fragments++;
1771 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1772 sta->rx_stats.bytes += rx->skb->len;
1773 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1775 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1776 sta->rx_stats.last_signal = status->signal;
1777 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1780 if (status->chains) {
1781 sta->rx_stats.chains = status->chains;
1782 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1783 int signal = status->chain_signal[i];
1785 if (!(status->chains & BIT(i)))
1788 sta->rx_stats.chain_signal_last[i] = signal;
1789 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1795 * Change STA power saving mode only at the end of a frame
1796 * exchange sequence, and only for a data or management
1797 * frame as specified in IEEE 802.11-2016 11.2.3.2
1799 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1800 !ieee80211_has_morefrags(hdr->frame_control) &&
1801 !is_multicast_ether_addr(hdr->addr1) &&
1802 (ieee80211_is_mgmt(hdr->frame_control) ||
1803 ieee80211_is_data(hdr->frame_control)) &&
1804 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1805 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1806 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1807 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1808 if (!ieee80211_has_pm(hdr->frame_control))
1811 if (ieee80211_has_pm(hdr->frame_control))
1816 /* mesh power save support */
1817 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1818 ieee80211_mps_rx_h_sta_process(sta, hdr);
1821 * Drop (qos-)data::nullfunc frames silently, since they
1822 * are used only to control station power saving mode.
1824 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1825 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1826 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1829 * If we receive a 4-addr nullfunc frame from a STA
1830 * that was not moved to a 4-addr STA vlan yet send
1831 * the event to userspace and for older hostapd drop
1832 * the frame to the monitor interface.
1834 if (ieee80211_has_a4(hdr->frame_control) &&
1835 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1836 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1837 !rx->sdata->u.vlan.sta))) {
1838 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1839 cfg80211_rx_unexpected_4addr_frame(
1840 rx->sdata->dev, sta->sta.addr,
1842 return RX_DROP_MONITOR;
1845 * Update counter and free packet here to avoid
1846 * counting this as a dropped packed.
1848 sta->rx_stats.packets++;
1849 dev_kfree_skb(rx->skb);
1854 } /* ieee80211_rx_h_sta_process */
1856 static ieee80211_rx_result debug_noinline
1857 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1859 struct sk_buff *skb = rx->skb;
1860 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1861 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1864 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1865 struct ieee80211_key *sta_ptk = NULL;
1866 int mmie_keyidx = -1;
1868 const struct ieee80211_cipher_scheme *cs = NULL;
1873 * There are four types of keys:
1874 * - GTK (group keys)
1875 * - IGTK (group keys for management frames)
1876 * - PTK (pairwise keys)
1877 * - STK (station-to-station pairwise keys)
1879 * When selecting a key, we have to distinguish between multicast
1880 * (including broadcast) and unicast frames, the latter can only
1881 * use PTKs and STKs while the former always use GTKs and IGTKs.
1882 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1883 * unicast frames can also use key indices like GTKs. Hence, if we
1884 * don't have a PTK/STK we check the key index for a WEP key.
1886 * Note that in a regular BSS, multicast frames are sent by the
1887 * AP only, associated stations unicast the frame to the AP first
1888 * which then multicasts it on their behalf.
1890 * There is also a slight problem in IBSS mode: GTKs are negotiated
1891 * with each station, that is something we don't currently handle.
1892 * The spec seems to expect that one negotiates the same key with
1893 * every station but there's no such requirement; VLANs could be
1897 /* start without a key */
1899 fc = hdr->frame_control;
1902 int keyid = rx->sta->ptk_idx;
1904 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1905 cs = rx->sta->cipher_scheme;
1906 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1907 if (unlikely(keyid < 0))
1908 return RX_DROP_UNUSABLE;
1910 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1913 if (!ieee80211_has_protected(fc))
1914 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1916 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1918 if ((status->flag & RX_FLAG_DECRYPTED) &&
1919 (status->flag & RX_FLAG_IV_STRIPPED))
1921 /* Skip decryption if the frame is not protected. */
1922 if (!ieee80211_has_protected(fc))
1924 } else if (mmie_keyidx >= 0) {
1925 /* Broadcast/multicast robust management frame / BIP */
1926 if ((status->flag & RX_FLAG_DECRYPTED) &&
1927 (status->flag & RX_FLAG_IV_STRIPPED))
1930 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1931 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1932 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1934 if (ieee80211_is_group_privacy_action(skb) &&
1935 test_sta_flag(rx->sta, WLAN_STA_MFP))
1936 return RX_DROP_MONITOR;
1938 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1941 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1942 } else if (!ieee80211_has_protected(fc)) {
1944 * The frame was not protected, so skip decryption. However, we
1945 * need to set rx->key if there is a key that could have been
1946 * used so that the frame may be dropped if encryption would
1947 * have been expected.
1949 struct ieee80211_key *key = NULL;
1950 struct ieee80211_sub_if_data *sdata = rx->sdata;
1953 if (ieee80211_is_mgmt(fc) &&
1954 is_multicast_ether_addr(hdr->addr1) &&
1955 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1959 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1960 key = rcu_dereference(rx->sta->gtk[i]);
1966 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1967 key = rcu_dereference(sdata->keys[i]);
1980 * The device doesn't give us the IV so we won't be
1981 * able to look up the key. That's ok though, we
1982 * don't need to decrypt the frame, we just won't
1983 * be able to keep statistics accurate.
1984 * Except for key threshold notifications, should
1985 * we somehow allow the driver to tell us which key
1986 * the hardware used if this flag is set?
1988 if ((status->flag & RX_FLAG_DECRYPTED) &&
1989 (status->flag & RX_FLAG_IV_STRIPPED))
1992 hdrlen = ieee80211_hdrlen(fc);
1995 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1997 if (unlikely(keyidx < 0))
1998 return RX_DROP_UNUSABLE;
2000 if (rx->skb->len < 8 + hdrlen)
2001 return RX_DROP_UNUSABLE; /* TODO: count this? */
2003 * no need to call ieee80211_wep_get_keyidx,
2004 * it verifies a bunch of things we've done already
2006 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
2007 keyidx = keyid >> 6;
2010 /* check per-station GTK first, if multicast packet */
2011 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2012 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2014 /* if not found, try default key */
2016 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2019 * RSNA-protected unicast frames should always be
2020 * sent with pairwise or station-to-station keys,
2021 * but for WEP we allow using a key index as well.
2024 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2025 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2026 !is_multicast_ether_addr(hdr->addr1))
2032 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2033 return RX_DROP_MONITOR;
2035 /* TODO: add threshold stuff again */
2037 return RX_DROP_MONITOR;
2040 switch (rx->key->conf.cipher) {
2041 case WLAN_CIPHER_SUITE_WEP40:
2042 case WLAN_CIPHER_SUITE_WEP104:
2043 result = ieee80211_crypto_wep_decrypt(rx);
2045 case WLAN_CIPHER_SUITE_TKIP:
2046 result = ieee80211_crypto_tkip_decrypt(rx);
2048 case WLAN_CIPHER_SUITE_CCMP:
2049 result = ieee80211_crypto_ccmp_decrypt(
2050 rx, IEEE80211_CCMP_MIC_LEN);
2052 case WLAN_CIPHER_SUITE_CCMP_256:
2053 result = ieee80211_crypto_ccmp_decrypt(
2054 rx, IEEE80211_CCMP_256_MIC_LEN);
2056 case WLAN_CIPHER_SUITE_AES_CMAC:
2057 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2059 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2060 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2062 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2063 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2064 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2066 case WLAN_CIPHER_SUITE_GCMP:
2067 case WLAN_CIPHER_SUITE_GCMP_256:
2068 result = ieee80211_crypto_gcmp_decrypt(rx);
2071 result = ieee80211_crypto_hw_decrypt(rx);
2074 /* the hdr variable is invalid after the decrypt handlers */
2076 /* either the frame has been decrypted or will be dropped */
2077 status->flag |= RX_FLAG_DECRYPTED;
2082 static inline struct ieee80211_fragment_entry *
2083 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2084 unsigned int frag, unsigned int seq, int rx_queue,
2085 struct sk_buff **skb)
2087 struct ieee80211_fragment_entry *entry;
2089 entry = &sdata->fragments[sdata->fragment_next++];
2090 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2091 sdata->fragment_next = 0;
2093 if (!skb_queue_empty(&entry->skb_list))
2094 __skb_queue_purge(&entry->skb_list);
2096 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2098 entry->first_frag_time = jiffies;
2100 entry->rx_queue = rx_queue;
2101 entry->last_frag = frag;
2102 entry->check_sequential_pn = false;
2103 entry->extra_len = 0;
2108 static inline struct ieee80211_fragment_entry *
2109 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2110 unsigned int frag, unsigned int seq,
2111 int rx_queue, struct ieee80211_hdr *hdr)
2113 struct ieee80211_fragment_entry *entry;
2116 idx = sdata->fragment_next;
2117 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2118 struct ieee80211_hdr *f_hdr;
2119 struct sk_buff *f_skb;
2123 idx = IEEE80211_FRAGMENT_MAX - 1;
2125 entry = &sdata->fragments[idx];
2126 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2127 entry->rx_queue != rx_queue ||
2128 entry->last_frag + 1 != frag)
2131 f_skb = __skb_peek(&entry->skb_list);
2132 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2135 * Check ftype and addresses are equal, else check next fragment
2137 if (((hdr->frame_control ^ f_hdr->frame_control) &
2138 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2139 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2140 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2143 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2144 __skb_queue_purge(&entry->skb_list);
2153 static ieee80211_rx_result debug_noinline
2154 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2156 struct ieee80211_hdr *hdr;
2159 unsigned int frag, seq;
2160 struct ieee80211_fragment_entry *entry;
2161 struct sk_buff *skb;
2163 hdr = (struct ieee80211_hdr *)rx->skb->data;
2164 fc = hdr->frame_control;
2166 if (ieee80211_is_ctl(fc))
2169 sc = le16_to_cpu(hdr->seq_ctrl);
2170 frag = sc & IEEE80211_SCTL_FRAG;
2172 if (is_multicast_ether_addr(hdr->addr1)) {
2173 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2177 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2180 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2182 if (skb_linearize(rx->skb))
2183 return RX_DROP_UNUSABLE;
2186 * skb_linearize() might change the skb->data and
2187 * previously cached variables (in this case, hdr) need to
2188 * be refreshed with the new data.
2190 hdr = (struct ieee80211_hdr *)rx->skb->data;
2191 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2194 /* This is the first fragment of a new frame. */
2195 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2196 rx->seqno_idx, &(rx->skb));
2198 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2199 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2200 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2201 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2202 ieee80211_has_protected(fc)) {
2203 int queue = rx->security_idx;
2205 /* Store CCMP/GCMP PN so that we can verify that the
2206 * next fragment has a sequential PN value.
2208 entry->check_sequential_pn = true;
2209 memcpy(entry->last_pn,
2210 rx->key->u.ccmp.rx_pn[queue],
2211 IEEE80211_CCMP_PN_LEN);
2212 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2214 offsetof(struct ieee80211_key,
2216 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2217 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2218 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2219 IEEE80211_GCMP_PN_LEN);
2224 /* This is a fragment for a frame that should already be pending in
2225 * fragment cache. Add this fragment to the end of the pending entry.
2227 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2228 rx->seqno_idx, hdr);
2230 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2231 return RX_DROP_MONITOR;
2234 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2235 * MPDU PN values are not incrementing in steps of 1."
2236 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2237 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2239 if (entry->check_sequential_pn) {
2241 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2245 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2246 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2247 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2248 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2249 return RX_DROP_UNUSABLE;
2250 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2251 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2256 queue = rx->security_idx;
2257 rpn = rx->key->u.ccmp.rx_pn[queue];
2258 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2259 return RX_DROP_UNUSABLE;
2260 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2263 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2264 __skb_queue_tail(&entry->skb_list, rx->skb);
2265 entry->last_frag = frag;
2266 entry->extra_len += rx->skb->len;
2267 if (ieee80211_has_morefrags(fc)) {
2272 rx->skb = __skb_dequeue(&entry->skb_list);
2273 if (skb_tailroom(rx->skb) < entry->extra_len) {
2274 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2275 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2277 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2278 __skb_queue_purge(&entry->skb_list);
2279 return RX_DROP_UNUSABLE;
2282 while ((skb = __skb_dequeue(&entry->skb_list))) {
2283 skb_put_data(rx->skb, skb->data, skb->len);
2288 ieee80211_led_rx(rx->local);
2291 rx->sta->rx_stats.packets++;
2295 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2297 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2303 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2305 struct sk_buff *skb = rx->skb;
2306 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2309 * Pass through unencrypted frames if the hardware has
2310 * decrypted them already.
2312 if (status->flag & RX_FLAG_DECRYPTED)
2315 /* Drop unencrypted frames if key is set. */
2316 if (unlikely(!ieee80211_has_protected(fc) &&
2317 !ieee80211_is_nullfunc(fc) &&
2318 ieee80211_is_data(fc) && rx->key))
2324 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2326 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2327 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2328 __le16 fc = hdr->frame_control;
2331 * Pass through unencrypted frames if the hardware has
2332 * decrypted them already.
2334 if (status->flag & RX_FLAG_DECRYPTED)
2337 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2338 if (unlikely(!ieee80211_has_protected(fc) &&
2339 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2341 if (ieee80211_is_deauth(fc) ||
2342 ieee80211_is_disassoc(fc))
2343 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2348 /* BIP does not use Protected field, so need to check MMIE */
2349 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2350 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2351 if (ieee80211_is_deauth(fc) ||
2352 ieee80211_is_disassoc(fc))
2353 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2359 * When using MFP, Action frames are not allowed prior to
2360 * having configured keys.
2362 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2363 ieee80211_is_robust_mgmt_frame(rx->skb)))
2371 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2373 struct ieee80211_sub_if_data *sdata = rx->sdata;
2374 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2375 bool check_port_control = false;
2376 struct ethhdr *ehdr;
2379 *port_control = false;
2380 if (ieee80211_has_a4(hdr->frame_control) &&
2381 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2384 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2385 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2387 if (!sdata->u.mgd.use_4addr)
2389 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2390 check_port_control = true;
2393 if (is_multicast_ether_addr(hdr->addr1) &&
2394 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2397 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2401 ehdr = (struct ethhdr *) rx->skb->data;
2402 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2403 *port_control = true;
2404 else if (check_port_control)
2411 * requires that rx->skb is a frame with ethernet header
2413 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2415 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2416 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2417 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2420 * Allow EAPOL frames to us/the PAE group address regardless
2421 * of whether the frame was encrypted or not.
2423 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2424 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2425 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2428 if (ieee80211_802_1x_port_control(rx) ||
2429 ieee80211_drop_unencrypted(rx, fc))
2435 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2436 struct ieee80211_rx_data *rx)
2438 struct ieee80211_sub_if_data *sdata = rx->sdata;
2439 struct net_device *dev = sdata->dev;
2441 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2442 skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2443 sdata->control_port_over_nl80211)) {
2444 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2445 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2447 cfg80211_rx_control_port(dev, skb, noencrypt);
2450 /* deliver to local stack */
2452 napi_gro_receive(rx->napi, skb);
2454 netif_receive_skb(skb);
2459 * requires that rx->skb is a frame with ethernet header
2462 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2464 struct ieee80211_sub_if_data *sdata = rx->sdata;
2465 struct net_device *dev = sdata->dev;
2466 struct sk_buff *skb, *xmit_skb;
2467 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2468 struct sta_info *dsta;
2473 ieee80211_rx_stats(dev, skb->len);
2476 /* The seqno index has the same property as needed
2477 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2478 * for non-QoS-data frames. Here we know it's a data
2479 * frame, so count MSDUs.
2481 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2482 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2483 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2486 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2487 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2488 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2489 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2490 if (is_multicast_ether_addr(ehdr->h_dest) &&
2491 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2493 * send multicast frames both to higher layers in
2494 * local net stack and back to the wireless medium
2496 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2498 net_info_ratelimited("%s: failed to clone multicast frame\n",
2500 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2501 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2502 dsta = sta_info_get(sdata, ehdr->h_dest);
2505 * The destination station is associated to
2506 * this AP (in this VLAN), so send the frame
2507 * directly to it and do not pass it to local
2516 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2518 /* 'align' will only take the values 0 or 2 here since all
2519 * frames are required to be aligned to 2-byte boundaries
2520 * when being passed to mac80211; the code here works just
2521 * as well if that isn't true, but mac80211 assumes it can
2522 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2526 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2528 if (WARN_ON(skb_headroom(skb) < 3)) {
2532 u8 *data = skb->data;
2533 size_t len = skb_headlen(skb);
2535 memmove(skb->data, data, len);
2536 skb_set_tail_pointer(skb, len);
2543 skb->protocol = eth_type_trans(skb, dev);
2544 memset(skb->cb, 0, sizeof(skb->cb));
2546 ieee80211_deliver_skb_to_local_stack(skb, rx);
2551 * Send to wireless media and increase priority by 256 to
2552 * keep the received priority instead of reclassifying
2553 * the frame (see cfg80211_classify8021d).
2555 xmit_skb->priority += 256;
2556 xmit_skb->protocol = htons(ETH_P_802_3);
2557 skb_reset_network_header(xmit_skb);
2558 skb_reset_mac_header(xmit_skb);
2559 dev_queue_xmit(xmit_skb);
2563 static ieee80211_rx_result debug_noinline
2564 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2566 struct net_device *dev = rx->sdata->dev;
2567 struct sk_buff *skb = rx->skb;
2568 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2569 __le16 fc = hdr->frame_control;
2570 struct sk_buff_head frame_list;
2571 struct ethhdr ethhdr;
2572 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2574 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2577 } else switch (rx->sdata->vif.type) {
2578 case NL80211_IFTYPE_AP:
2579 case NL80211_IFTYPE_AP_VLAN:
2582 case NL80211_IFTYPE_STATION:
2584 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2587 case NL80211_IFTYPE_MESH_POINT:
2595 __skb_queue_head_init(&frame_list);
2597 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
2598 rx->sdata->vif.addr,
2599 rx->sdata->vif.type,
2601 return RX_DROP_UNUSABLE;
2603 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2604 rx->sdata->vif.type,
2605 rx->local->hw.extra_tx_headroom,
2606 check_da, check_sa);
2608 while (!skb_queue_empty(&frame_list)) {
2609 rx->skb = __skb_dequeue(&frame_list);
2611 if (!ieee80211_frame_allowed(rx, fc)) {
2612 dev_kfree_skb(rx->skb);
2616 ieee80211_deliver_skb(rx);
2622 static ieee80211_rx_result debug_noinline
2623 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2625 struct sk_buff *skb = rx->skb;
2626 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2627 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2628 __le16 fc = hdr->frame_control;
2630 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2633 if (unlikely(!ieee80211_is_data(fc)))
2636 if (unlikely(!ieee80211_is_data_present(fc)))
2637 return RX_DROP_MONITOR;
2639 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2640 switch (rx->sdata->vif.type) {
2641 case NL80211_IFTYPE_AP_VLAN:
2642 if (!rx->sdata->u.vlan.sta)
2643 return RX_DROP_UNUSABLE;
2645 case NL80211_IFTYPE_STATION:
2646 if (!rx->sdata->u.mgd.use_4addr)
2647 return RX_DROP_UNUSABLE;
2650 return RX_DROP_UNUSABLE;
2654 if (is_multicast_ether_addr(hdr->addr1))
2655 return RX_DROP_UNUSABLE;
2657 return __ieee80211_rx_h_amsdu(rx, 0);
2660 #ifdef CONFIG_MAC80211_MESH
2661 static ieee80211_rx_result
2662 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2664 struct ieee80211_hdr *fwd_hdr, *hdr;
2665 struct ieee80211_tx_info *info;
2666 struct ieee80211s_hdr *mesh_hdr;
2667 struct sk_buff *skb = rx->skb, *fwd_skb;
2668 struct ieee80211_local *local = rx->local;
2669 struct ieee80211_sub_if_data *sdata = rx->sdata;
2670 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2674 hdr = (struct ieee80211_hdr *) skb->data;
2675 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2677 /* make sure fixed part of mesh header is there, also checks skb len */
2678 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2679 return RX_DROP_MONITOR;
2681 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2683 /* make sure full mesh header is there, also checks skb len */
2684 if (!pskb_may_pull(rx->skb,
2685 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2686 return RX_DROP_MONITOR;
2688 /* reload pointers */
2689 hdr = (struct ieee80211_hdr *) skb->data;
2690 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2692 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2693 return RX_DROP_MONITOR;
2695 /* frame is in RMC, don't forward */
2696 if (ieee80211_is_data(hdr->frame_control) &&
2697 is_multicast_ether_addr(hdr->addr1) &&
2698 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2699 return RX_DROP_MONITOR;
2701 if (!ieee80211_is_data(hdr->frame_control))
2705 return RX_DROP_MONITOR;
2707 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2708 struct mesh_path *mppath;
2712 if (is_multicast_ether_addr(hdr->addr1)) {
2713 mpp_addr = hdr->addr3;
2714 proxied_addr = mesh_hdr->eaddr1;
2715 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2716 MESH_FLAGS_AE_A5_A6) {
2717 /* has_a4 already checked in ieee80211_rx_mesh_check */
2718 mpp_addr = hdr->addr4;
2719 proxied_addr = mesh_hdr->eaddr2;
2721 return RX_DROP_MONITOR;
2725 mppath = mpp_path_lookup(sdata, proxied_addr);
2727 mpp_path_add(sdata, proxied_addr, mpp_addr);
2729 spin_lock_bh(&mppath->state_lock);
2730 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2731 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2732 mppath->exp_time = jiffies;
2733 spin_unlock_bh(&mppath->state_lock);
2738 /* Frame has reached destination. Don't forward */
2739 if (!is_multicast_ether_addr(hdr->addr1) &&
2740 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2743 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2744 q = sdata->vif.hw_queue[ac];
2745 if (ieee80211_queue_stopped(&local->hw, q)) {
2746 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2747 return RX_DROP_MONITOR;
2749 skb_set_queue_mapping(skb, q);
2751 if (!--mesh_hdr->ttl) {
2752 if (!is_multicast_ether_addr(hdr->addr1))
2753 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2754 dropped_frames_ttl);
2758 if (!ifmsh->mshcfg.dot11MeshForwarding)
2761 if (sdata->crypto_tx_tailroom_needed_cnt)
2762 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2764 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2765 sdata->encrypt_headroom,
2766 tailroom, GFP_ATOMIC);
2770 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2771 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2772 info = IEEE80211_SKB_CB(fwd_skb);
2773 memset(info, 0, sizeof(*info));
2774 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2775 info->control.vif = &rx->sdata->vif;
2776 info->control.jiffies = jiffies;
2777 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2778 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2779 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2780 /* update power mode indication when forwarding */
2781 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2782 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2783 /* mesh power mode flags updated in mesh_nexthop_lookup */
2784 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2786 /* unable to resolve next hop */
2787 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2789 WLAN_REASON_MESH_PATH_NOFORWARD,
2791 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2793 return RX_DROP_MONITOR;
2796 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2797 ieee80211_add_pending_skb(local, fwd_skb);
2799 if (is_multicast_ether_addr(hdr->addr1))
2801 return RX_DROP_MONITOR;
2805 static ieee80211_rx_result debug_noinline
2806 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2808 struct ieee80211_sub_if_data *sdata = rx->sdata;
2809 struct ieee80211_local *local = rx->local;
2810 struct net_device *dev = sdata->dev;
2811 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2812 __le16 fc = hdr->frame_control;
2816 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2819 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2820 return RX_DROP_MONITOR;
2823 * Send unexpected-4addr-frame event to hostapd. For older versions,
2824 * also drop the frame to cooked monitor interfaces.
2826 if (ieee80211_has_a4(hdr->frame_control) &&
2827 sdata->vif.type == NL80211_IFTYPE_AP) {
2829 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2830 cfg80211_rx_unexpected_4addr_frame(
2831 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2832 return RX_DROP_MONITOR;
2835 err = __ieee80211_data_to_8023(rx, &port_control);
2837 return RX_DROP_UNUSABLE;
2839 if (!ieee80211_frame_allowed(rx, fc))
2840 return RX_DROP_MONITOR;
2842 /* directly handle TDLS channel switch requests/responses */
2843 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2844 cpu_to_be16(ETH_P_TDLS))) {
2845 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2847 if (pskb_may_pull(rx->skb,
2848 offsetof(struct ieee80211_tdls_data, u)) &&
2849 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2850 tf->category == WLAN_CATEGORY_TDLS &&
2851 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2852 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2853 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2854 schedule_work(&local->tdls_chsw_work);
2856 rx->sta->rx_stats.packets++;
2862 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2863 unlikely(port_control) && sdata->bss) {
2864 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2872 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2873 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2874 !is_multicast_ether_addr(
2875 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2876 (!local->scanning &&
2877 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2878 mod_timer(&local->dynamic_ps_timer, jiffies +
2879 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2881 ieee80211_deliver_skb(rx);
2886 static ieee80211_rx_result debug_noinline
2887 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2889 struct sk_buff *skb = rx->skb;
2890 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2891 struct tid_ampdu_rx *tid_agg_rx;
2895 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2898 if (ieee80211_is_back_req(bar->frame_control)) {
2900 __le16 control, start_seq_num;
2901 } __packed bar_data;
2902 struct ieee80211_event event = {
2903 .type = BAR_RX_EVENT,
2907 return RX_DROP_MONITOR;
2909 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2910 &bar_data, sizeof(bar_data)))
2911 return RX_DROP_MONITOR;
2913 tid = le16_to_cpu(bar_data.control) >> 12;
2915 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2916 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2917 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2918 WLAN_BACK_RECIPIENT,
2919 WLAN_REASON_QSTA_REQUIRE_SETUP);
2921 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2923 return RX_DROP_MONITOR;
2925 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2926 event.u.ba.tid = tid;
2927 event.u.ba.ssn = start_seq_num;
2928 event.u.ba.sta = &rx->sta->sta;
2930 /* reset session timer */
2931 if (tid_agg_rx->timeout)
2932 mod_timer(&tid_agg_rx->session_timer,
2933 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2935 spin_lock(&tid_agg_rx->reorder_lock);
2936 /* release stored frames up to start of BAR */
2937 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2938 start_seq_num, frames);
2939 spin_unlock(&tid_agg_rx->reorder_lock);
2941 drv_event_callback(rx->local, rx->sdata, &event);
2948 * After this point, we only want management frames,
2949 * so we can drop all remaining control frames to
2950 * cooked monitor interfaces.
2952 return RX_DROP_MONITOR;
2955 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2956 struct ieee80211_mgmt *mgmt,
2959 struct ieee80211_local *local = sdata->local;
2960 struct sk_buff *skb;
2961 struct ieee80211_mgmt *resp;
2963 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2964 /* Not to own unicast address */
2968 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2969 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2970 /* Not from the current AP or not associated yet. */
2974 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2975 /* Too short SA Query request frame */
2979 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2983 skb_reserve(skb, local->hw.extra_tx_headroom);
2984 resp = skb_put_zero(skb, 24);
2985 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2986 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2987 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2988 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2989 IEEE80211_STYPE_ACTION);
2990 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2991 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2992 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2993 memcpy(resp->u.action.u.sa_query.trans_id,
2994 mgmt->u.action.u.sa_query.trans_id,
2995 WLAN_SA_QUERY_TR_ID_LEN);
2997 ieee80211_tx_skb(sdata, skb);
3000 static ieee80211_rx_result debug_noinline
3001 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3003 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3004 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3007 * From here on, look only at management frames.
3008 * Data and control frames are already handled,
3009 * and unknown (reserved) frames are useless.
3011 if (rx->skb->len < 24)
3012 return RX_DROP_MONITOR;
3014 if (!ieee80211_is_mgmt(mgmt->frame_control))
3015 return RX_DROP_MONITOR;
3017 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3018 ieee80211_is_beacon(mgmt->frame_control) &&
3019 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3022 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3023 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3024 sig = status->signal;
3026 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3027 rx->skb->data, rx->skb->len,
3029 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3032 if (ieee80211_drop_unencrypted_mgmt(rx))
3033 return RX_DROP_UNUSABLE;
3038 static ieee80211_rx_result debug_noinline
3039 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3041 struct ieee80211_local *local = rx->local;
3042 struct ieee80211_sub_if_data *sdata = rx->sdata;
3043 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3044 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3045 int len = rx->skb->len;
3047 if (!ieee80211_is_action(mgmt->frame_control))
3050 /* drop too small frames */
3051 if (len < IEEE80211_MIN_ACTION_SIZE)
3052 return RX_DROP_UNUSABLE;
3054 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3055 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3056 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3057 return RX_DROP_UNUSABLE;
3059 switch (mgmt->u.action.category) {
3060 case WLAN_CATEGORY_HT:
3061 /* reject HT action frames from stations not supporting HT */
3062 if (!rx->sta->sta.ht_cap.ht_supported)
3065 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3066 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3067 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3068 sdata->vif.type != NL80211_IFTYPE_AP &&
3069 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3072 /* verify action & smps_control/chanwidth are present */
3073 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3076 switch (mgmt->u.action.u.ht_smps.action) {
3077 case WLAN_HT_ACTION_SMPS: {
3078 struct ieee80211_supported_band *sband;
3079 enum ieee80211_smps_mode smps_mode;
3080 struct sta_opmode_info sta_opmode = {};
3082 /* convert to HT capability */
3083 switch (mgmt->u.action.u.ht_smps.smps_control) {
3084 case WLAN_HT_SMPS_CONTROL_DISABLED:
3085 smps_mode = IEEE80211_SMPS_OFF;
3087 case WLAN_HT_SMPS_CONTROL_STATIC:
3088 smps_mode = IEEE80211_SMPS_STATIC;
3090 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3091 smps_mode = IEEE80211_SMPS_DYNAMIC;
3097 /* if no change do nothing */
3098 if (rx->sta->sta.smps_mode == smps_mode)
3100 rx->sta->sta.smps_mode = smps_mode;
3101 sta_opmode.smps_mode =
3102 ieee80211_smps_mode_to_smps_mode(smps_mode);
3103 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3105 sband = rx->local->hw.wiphy->bands[status->band];
3107 rate_control_rate_update(local, sband, rx->sta,
3108 IEEE80211_RC_SMPS_CHANGED);
3109 cfg80211_sta_opmode_change_notify(sdata->dev,
3115 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3116 struct ieee80211_supported_band *sband;
3117 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3118 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3119 struct sta_opmode_info sta_opmode = {};
3121 /* If it doesn't support 40 MHz it can't change ... */
3122 if (!(rx->sta->sta.ht_cap.cap &
3123 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3126 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3127 max_bw = IEEE80211_STA_RX_BW_20;
3129 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3131 /* set cur_max_bandwidth and recalc sta bw */
3132 rx->sta->cur_max_bandwidth = max_bw;
3133 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3135 if (rx->sta->sta.bandwidth == new_bw)
3138 rx->sta->sta.bandwidth = new_bw;
3139 sband = rx->local->hw.wiphy->bands[status->band];
3141 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3142 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3144 rate_control_rate_update(local, sband, rx->sta,
3145 IEEE80211_RC_BW_CHANGED);
3146 cfg80211_sta_opmode_change_notify(sdata->dev,
3157 case WLAN_CATEGORY_PUBLIC:
3158 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3160 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3164 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3166 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3167 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3169 if (len < offsetof(struct ieee80211_mgmt,
3170 u.action.u.ext_chan_switch.variable))
3173 case WLAN_CATEGORY_VHT:
3174 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3175 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3176 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3177 sdata->vif.type != NL80211_IFTYPE_AP &&
3178 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3181 /* verify action code is present */
3182 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3185 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3186 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3187 /* verify opmode is present */
3188 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3192 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3193 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3201 case WLAN_CATEGORY_BACK:
3202 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3203 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3204 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3205 sdata->vif.type != NL80211_IFTYPE_AP &&
3206 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3209 /* verify action_code is present */
3210 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3213 switch (mgmt->u.action.u.addba_req.action_code) {
3214 case WLAN_ACTION_ADDBA_REQ:
3215 if (len < (IEEE80211_MIN_ACTION_SIZE +
3216 sizeof(mgmt->u.action.u.addba_req)))
3219 case WLAN_ACTION_ADDBA_RESP:
3220 if (len < (IEEE80211_MIN_ACTION_SIZE +
3221 sizeof(mgmt->u.action.u.addba_resp)))
3224 case WLAN_ACTION_DELBA:
3225 if (len < (IEEE80211_MIN_ACTION_SIZE +
3226 sizeof(mgmt->u.action.u.delba)))
3234 case WLAN_CATEGORY_SPECTRUM_MGMT:
3235 /* verify action_code is present */
3236 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3239 switch (mgmt->u.action.u.measurement.action_code) {
3240 case WLAN_ACTION_SPCT_MSR_REQ:
3241 if (status->band != NL80211_BAND_5GHZ)
3244 if (len < (IEEE80211_MIN_ACTION_SIZE +
3245 sizeof(mgmt->u.action.u.measurement)))
3248 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3251 ieee80211_process_measurement_req(sdata, mgmt, len);
3253 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3255 if (len < (IEEE80211_MIN_ACTION_SIZE +
3256 sizeof(mgmt->u.action.u.chan_switch)))
3259 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3260 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3261 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3264 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3265 bssid = sdata->u.mgd.bssid;
3266 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3267 bssid = sdata->u.ibss.bssid;
3268 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3273 if (!ether_addr_equal(mgmt->bssid, bssid))
3280 case WLAN_CATEGORY_SA_QUERY:
3281 if (len < (IEEE80211_MIN_ACTION_SIZE +
3282 sizeof(mgmt->u.action.u.sa_query)))
3285 switch (mgmt->u.action.u.sa_query.action) {
3286 case WLAN_ACTION_SA_QUERY_REQUEST:
3287 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3289 ieee80211_process_sa_query_req(sdata, mgmt, len);
3293 case WLAN_CATEGORY_SELF_PROTECTED:
3294 if (len < (IEEE80211_MIN_ACTION_SIZE +
3295 sizeof(mgmt->u.action.u.self_prot.action_code)))
3298 switch (mgmt->u.action.u.self_prot.action_code) {
3299 case WLAN_SP_MESH_PEERING_OPEN:
3300 case WLAN_SP_MESH_PEERING_CLOSE:
3301 case WLAN_SP_MESH_PEERING_CONFIRM:
3302 if (!ieee80211_vif_is_mesh(&sdata->vif))
3304 if (sdata->u.mesh.user_mpm)
3305 /* userspace handles this frame */
3308 case WLAN_SP_MGK_INFORM:
3309 case WLAN_SP_MGK_ACK:
3310 if (!ieee80211_vif_is_mesh(&sdata->vif))
3315 case WLAN_CATEGORY_MESH_ACTION:
3316 if (len < (IEEE80211_MIN_ACTION_SIZE +
3317 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3320 if (!ieee80211_vif_is_mesh(&sdata->vif))
3322 if (mesh_action_is_path_sel(mgmt) &&
3323 !mesh_path_sel_is_hwmp(sdata))
3331 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3332 /* will return in the next handlers */
3337 rx->sta->rx_stats.packets++;
3338 dev_kfree_skb(rx->skb);
3342 skb_queue_tail(&sdata->skb_queue, rx->skb);
3343 ieee80211_queue_work(&local->hw, &sdata->work);
3345 rx->sta->rx_stats.packets++;
3349 static ieee80211_rx_result debug_noinline
3350 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3355 /* skip known-bad action frames and return them in the next handler */
3356 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3360 * Getting here means the kernel doesn't know how to handle
3361 * it, but maybe userspace does ... include returned frames
3362 * so userspace can register for those to know whether ones
3363 * it transmitted were processed or returned.
3366 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3367 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3368 sig = status->signal;
3370 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3371 rx->skb->data, rx->skb->len, 0)) {
3373 rx->sta->rx_stats.packets++;
3374 dev_kfree_skb(rx->skb);
3381 static ieee80211_rx_result debug_noinline
3382 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3384 struct ieee80211_local *local = rx->local;
3385 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3386 struct sk_buff *nskb;
3387 struct ieee80211_sub_if_data *sdata = rx->sdata;
3388 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3390 if (!ieee80211_is_action(mgmt->frame_control))
3394 * For AP mode, hostapd is responsible for handling any action
3395 * frames that we didn't handle, including returning unknown
3396 * ones. For all other modes we will return them to the sender,
3397 * setting the 0x80 bit in the action category, as required by
3398 * 802.11-2012 9.24.4.
3399 * Newer versions of hostapd shall also use the management frame
3400 * registration mechanisms, but older ones still use cooked
3401 * monitor interfaces so push all frames there.
3403 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3404 (sdata->vif.type == NL80211_IFTYPE_AP ||
3405 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3406 return RX_DROP_MONITOR;
3408 if (is_multicast_ether_addr(mgmt->da))
3409 return RX_DROP_MONITOR;
3411 /* do not return rejected action frames */
3412 if (mgmt->u.action.category & 0x80)
3413 return RX_DROP_UNUSABLE;
3415 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3418 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3420 nmgmt->u.action.category |= 0x80;
3421 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3422 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3424 memset(nskb->cb, 0, sizeof(nskb->cb));
3426 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3427 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3429 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3430 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3431 IEEE80211_TX_CTL_NO_CCK_RATE;
3432 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3434 local->hw.offchannel_tx_hw_queue;
3437 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3440 dev_kfree_skb(rx->skb);
3444 static ieee80211_rx_result debug_noinline
3445 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3447 struct ieee80211_sub_if_data *sdata = rx->sdata;
3448 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3451 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3453 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3454 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3455 sdata->vif.type != NL80211_IFTYPE_OCB &&
3456 sdata->vif.type != NL80211_IFTYPE_STATION)
3457 return RX_DROP_MONITOR;
3460 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3461 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3462 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3463 /* process for all: mesh, mlme, ibss */
3465 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3466 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3467 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3468 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3469 if (is_multicast_ether_addr(mgmt->da) &&
3470 !is_broadcast_ether_addr(mgmt->da))
3471 return RX_DROP_MONITOR;
3473 /* process only for station */
3474 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3475 return RX_DROP_MONITOR;
3477 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3478 /* process only for ibss and mesh */
3479 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3480 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3481 return RX_DROP_MONITOR;
3484 return RX_DROP_MONITOR;
3487 /* queue up frame and kick off work to process it */
3488 skb_queue_tail(&sdata->skb_queue, rx->skb);
3489 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3491 rx->sta->rx_stats.packets++;
3496 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3497 struct ieee80211_rate *rate)
3499 struct ieee80211_sub_if_data *sdata;
3500 struct ieee80211_local *local = rx->local;
3501 struct sk_buff *skb = rx->skb, *skb2;
3502 struct net_device *prev_dev = NULL;
3503 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3504 int needed_headroom;
3507 * If cooked monitor has been processed already, then
3508 * don't do it again. If not, set the flag.
3510 if (rx->flags & IEEE80211_RX_CMNTR)
3512 rx->flags |= IEEE80211_RX_CMNTR;
3514 /* If there are no cooked monitor interfaces, just free the SKB */
3515 if (!local->cooked_mntrs)
3518 /* vendor data is long removed here */
3519 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3520 /* room for the radiotap header based on driver features */
3521 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3523 if (skb_headroom(skb) < needed_headroom &&
3524 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3527 /* prepend radiotap information */
3528 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3531 skb_reset_mac_header(skb);
3532 skb->ip_summed = CHECKSUM_UNNECESSARY;
3533 skb->pkt_type = PACKET_OTHERHOST;
3534 skb->protocol = htons(ETH_P_802_2);
3536 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3537 if (!ieee80211_sdata_running(sdata))
3540 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3541 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3545 skb2 = skb_clone(skb, GFP_ATOMIC);
3547 skb2->dev = prev_dev;
3548 netif_receive_skb(skb2);
3552 prev_dev = sdata->dev;
3553 ieee80211_rx_stats(sdata->dev, skb->len);
3557 skb->dev = prev_dev;
3558 netif_receive_skb(skb);
3566 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3567 ieee80211_rx_result res)
3570 case RX_DROP_MONITOR:
3571 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3573 rx->sta->rx_stats.dropped++;
3576 struct ieee80211_rate *rate = NULL;
3577 struct ieee80211_supported_band *sband;
3578 struct ieee80211_rx_status *status;
3580 status = IEEE80211_SKB_RXCB((rx->skb));
3582 sband = rx->local->hw.wiphy->bands[status->band];
3583 if (status->encoding == RX_ENC_LEGACY)
3584 rate = &sband->bitrates[status->rate_idx];
3586 ieee80211_rx_cooked_monitor(rx, rate);
3589 case RX_DROP_UNUSABLE:
3590 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3592 rx->sta->rx_stats.dropped++;
3593 dev_kfree_skb(rx->skb);
3596 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3601 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3602 struct sk_buff_head *frames)
3604 ieee80211_rx_result res = RX_DROP_MONITOR;
3605 struct sk_buff *skb;
3607 #define CALL_RXH(rxh) \
3610 if (res != RX_CONTINUE) \
3614 /* Lock here to avoid hitting all of the data used in the RX
3615 * path (e.g. key data, station data, ...) concurrently when
3616 * a frame is released from the reorder buffer due to timeout
3617 * from the timer, potentially concurrently with RX from the
3620 spin_lock_bh(&rx->local->rx_path_lock);
3622 while ((skb = __skb_dequeue(frames))) {
3624 * all the other fields are valid across frames
3625 * that belong to an aMPDU since they are on the
3626 * same TID from the same station
3630 CALL_RXH(ieee80211_rx_h_check_more_data);
3631 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3632 CALL_RXH(ieee80211_rx_h_sta_process);
3633 CALL_RXH(ieee80211_rx_h_decrypt);
3634 CALL_RXH(ieee80211_rx_h_defragment);
3635 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3636 /* must be after MMIC verify so header is counted in MPDU mic */
3637 #ifdef CONFIG_MAC80211_MESH
3638 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3639 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3641 CALL_RXH(ieee80211_rx_h_amsdu);
3642 CALL_RXH(ieee80211_rx_h_data);
3644 /* special treatment -- needs the queue */
3645 res = ieee80211_rx_h_ctrl(rx, frames);
3646 if (res != RX_CONTINUE)
3649 CALL_RXH(ieee80211_rx_h_mgmt_check);
3650 CALL_RXH(ieee80211_rx_h_action);
3651 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3652 CALL_RXH(ieee80211_rx_h_action_return);
3653 CALL_RXH(ieee80211_rx_h_mgmt);
3656 ieee80211_rx_handlers_result(rx, res);
3661 spin_unlock_bh(&rx->local->rx_path_lock);
3664 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3666 struct sk_buff_head reorder_release;
3667 ieee80211_rx_result res = RX_DROP_MONITOR;
3669 __skb_queue_head_init(&reorder_release);
3671 #define CALL_RXH(rxh) \
3674 if (res != RX_CONTINUE) \
3678 CALL_RXH(ieee80211_rx_h_check_dup);
3679 CALL_RXH(ieee80211_rx_h_check);
3681 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3683 ieee80211_rx_handlers(rx, &reorder_release);
3687 ieee80211_rx_handlers_result(rx, res);
3693 * This function makes calls into the RX path, therefore
3694 * it has to be invoked under RCU read lock.
3696 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3698 struct sk_buff_head frames;
3699 struct ieee80211_rx_data rx = {
3701 .sdata = sta->sdata,
3702 .local = sta->local,
3703 /* This is OK -- must be QoS data frame */
3704 .security_idx = tid,
3706 .napi = NULL, /* must be NULL to not have races */
3708 struct tid_ampdu_rx *tid_agg_rx;
3710 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3714 __skb_queue_head_init(&frames);
3716 spin_lock(&tid_agg_rx->reorder_lock);
3717 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3718 spin_unlock(&tid_agg_rx->reorder_lock);
3720 if (!skb_queue_empty(&frames)) {
3721 struct ieee80211_event event = {
3722 .type = BA_FRAME_TIMEOUT,
3724 .u.ba.sta = &sta->sta,
3726 drv_event_callback(rx.local, rx.sdata, &event);
3729 ieee80211_rx_handlers(&rx, &frames);
3732 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3733 u16 ssn, u64 filtered,
3736 struct sta_info *sta;
3737 struct tid_ampdu_rx *tid_agg_rx;
3738 struct sk_buff_head frames;
3739 struct ieee80211_rx_data rx = {
3740 /* This is OK -- must be QoS data frame */
3741 .security_idx = tid,
3746 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3749 __skb_queue_head_init(&frames);
3751 sta = container_of(pubsta, struct sta_info, sta);
3754 rx.sdata = sta->sdata;
3755 rx.local = sta->local;
3758 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3762 spin_lock_bh(&tid_agg_rx->reorder_lock);
3764 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3767 /* release all frames in the reorder buffer */
3768 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3769 IEEE80211_SN_MODULO;
3770 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3772 /* update ssn to match received ssn */
3773 tid_agg_rx->head_seq_num = ssn;
3775 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3779 /* handle the case that received ssn is behind the mac ssn.
3780 * it can be tid_agg_rx->buf_size behind and still be valid */
3781 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3782 if (diff >= tid_agg_rx->buf_size) {
3783 tid_agg_rx->reorder_buf_filtered = 0;
3786 filtered = filtered >> diff;
3790 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3791 int index = (ssn + i) % tid_agg_rx->buf_size;
3793 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3794 if (filtered & BIT_ULL(i))
3795 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3798 /* now process also frames that the filter marking released */
3799 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3802 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3804 ieee80211_rx_handlers(&rx, &frames);
3809 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3811 /* main receive path */
3813 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3815 struct ieee80211_sub_if_data *sdata = rx->sdata;
3816 struct sk_buff *skb = rx->skb;
3817 struct ieee80211_hdr *hdr = (void *)skb->data;
3818 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3819 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3820 bool multicast = is_multicast_ether_addr(hdr->addr1);
3822 switch (sdata->vif.type) {
3823 case NL80211_IFTYPE_STATION:
3824 if (!bssid && !sdata->u.mgd.use_4addr)
3828 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3829 case NL80211_IFTYPE_ADHOC:
3832 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3833 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3835 if (ieee80211_is_beacon(hdr->frame_control))
3837 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3840 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3844 if (status->encoding != RX_ENC_LEGACY)
3845 rate_idx = 0; /* TODO: HT/VHT rates */
3847 rate_idx = status->rate_idx;
3848 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3852 case NL80211_IFTYPE_OCB:
3855 if (!ieee80211_is_data_present(hdr->frame_control))
3857 if (!is_broadcast_ether_addr(bssid))
3860 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3864 if (status->encoding != RX_ENC_LEGACY)
3865 rate_idx = 0; /* TODO: HT rates */
3867 rate_idx = status->rate_idx;
3868 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3872 case NL80211_IFTYPE_MESH_POINT:
3873 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3877 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3878 case NL80211_IFTYPE_AP_VLAN:
3879 case NL80211_IFTYPE_AP:
3881 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3883 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3885 * Accept public action frames even when the
3886 * BSSID doesn't match, this is used for P2P
3887 * and location updates. Note that mac80211
3888 * itself never looks at these frames.
3891 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3893 if (ieee80211_is_public_action(hdr, skb->len))
3895 return ieee80211_is_beacon(hdr->frame_control);
3898 if (!ieee80211_has_tods(hdr->frame_control)) {
3899 /* ignore data frames to TDLS-peers */
3900 if (ieee80211_is_data(hdr->frame_control))
3902 /* ignore action frames to TDLS-peers */
3903 if (ieee80211_is_action(hdr->frame_control) &&
3904 !is_broadcast_ether_addr(bssid) &&
3905 !ether_addr_equal(bssid, hdr->addr1))
3910 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3911 * the BSSID - we've checked that already but may have accepted
3912 * the wildcard (ff:ff:ff:ff:ff:ff).
3915 * The BSSID of the Data frame is determined as follows:
3916 * a) If the STA is contained within an AP or is associated
3917 * with an AP, the BSSID is the address currently in use
3918 * by the STA contained in the AP.
3920 * So we should not accept data frames with an address that's
3923 * Accepting it also opens a security problem because stations
3924 * could encrypt it with the GTK and inject traffic that way.
3926 if (ieee80211_is_data(hdr->frame_control) && multicast)
3930 case NL80211_IFTYPE_WDS:
3931 if (bssid || !ieee80211_is_data(hdr->frame_control))
3933 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3934 case NL80211_IFTYPE_P2P_DEVICE:
3935 return ieee80211_is_public_action(hdr, skb->len) ||
3936 ieee80211_is_probe_req(hdr->frame_control) ||
3937 ieee80211_is_probe_resp(hdr->frame_control) ||
3938 ieee80211_is_beacon(hdr->frame_control);
3939 case NL80211_IFTYPE_NAN:
3940 /* Currently no frames on NAN interface are allowed */
3950 void ieee80211_check_fast_rx(struct sta_info *sta)
3952 struct ieee80211_sub_if_data *sdata = sta->sdata;
3953 struct ieee80211_local *local = sdata->local;
3954 struct ieee80211_key *key;
3955 struct ieee80211_fast_rx fastrx = {
3957 .vif_type = sdata->vif.type,
3958 .control_port_protocol = sdata->control_port_protocol,
3959 }, *old, *new = NULL;
3960 bool assign = false;
3962 /* use sparse to check that we don't return without updating */
3963 __acquire(check_fast_rx);
3965 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3966 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3967 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3968 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3970 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3972 /* fast-rx doesn't do reordering */
3973 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3974 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3977 switch (sdata->vif.type) {
3978 case NL80211_IFTYPE_STATION:
3979 if (sta->sta.tdls) {
3980 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3981 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3982 fastrx.expected_ds_bits = 0;
3984 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3985 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3986 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3987 fastrx.expected_ds_bits =
3988 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3991 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3992 fastrx.expected_ds_bits |=
3993 cpu_to_le16(IEEE80211_FCTL_TODS);
3994 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3995 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3998 if (!sdata->u.mgd.powersave)
4001 /* software powersave is a huge mess, avoid all of it */
4002 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4004 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4005 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4008 case NL80211_IFTYPE_AP_VLAN:
4009 case NL80211_IFTYPE_AP:
4010 /* parallel-rx requires this, at least with calls to
4011 * ieee80211_sta_ps_transition()
4013 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4015 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4016 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4017 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4019 fastrx.internal_forward =
4020 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4021 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4022 !sdata->u.vlan.sta);
4024 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4025 sdata->u.vlan.sta) {
4026 fastrx.expected_ds_bits |=
4027 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4028 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4029 fastrx.internal_forward = 0;
4037 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4041 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4043 switch (key->conf.cipher) {
4044 case WLAN_CIPHER_SUITE_TKIP:
4045 /* we don't want to deal with MMIC in fast-rx */
4047 case WLAN_CIPHER_SUITE_CCMP:
4048 case WLAN_CIPHER_SUITE_CCMP_256:
4049 case WLAN_CIPHER_SUITE_GCMP:
4050 case WLAN_CIPHER_SUITE_GCMP_256:
4053 /* we also don't want to deal with WEP or cipher scheme
4054 * since those require looking up the key idx in the
4055 * frame, rather than assuming the PTK is used
4056 * (we need to revisit this once we implement the real
4057 * PTK index, which is now valid in the spec, but we
4058 * haven't implemented that part yet)
4064 fastrx.icv_len = key->conf.icv_len;
4071 __release(check_fast_rx);
4074 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4076 spin_lock_bh(&sta->lock);
4077 old = rcu_dereference_protected(sta->fast_rx, true);
4078 rcu_assign_pointer(sta->fast_rx, new);
4079 spin_unlock_bh(&sta->lock);
4082 kfree_rcu(old, rcu_head);
4085 void ieee80211_clear_fast_rx(struct sta_info *sta)
4087 struct ieee80211_fast_rx *old;
4089 spin_lock_bh(&sta->lock);
4090 old = rcu_dereference_protected(sta->fast_rx, true);
4091 RCU_INIT_POINTER(sta->fast_rx, NULL);
4092 spin_unlock_bh(&sta->lock);
4095 kfree_rcu(old, rcu_head);
4098 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4100 struct ieee80211_local *local = sdata->local;
4101 struct sta_info *sta;
4103 lockdep_assert_held(&local->sta_mtx);
4105 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4106 if (sdata != sta->sdata &&
4107 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4109 ieee80211_check_fast_rx(sta);
4113 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4115 struct ieee80211_local *local = sdata->local;
4117 mutex_lock(&local->sta_mtx);
4118 __ieee80211_check_fast_rx_iface(sdata);
4119 mutex_unlock(&local->sta_mtx);
4122 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4123 struct ieee80211_fast_rx *fast_rx)
4125 struct sk_buff *skb = rx->skb;
4126 struct ieee80211_hdr *hdr = (void *)skb->data;
4127 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4128 struct sta_info *sta = rx->sta;
4129 int orig_len = skb->len;
4130 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4131 int snap_offs = hdrlen;
4133 u8 snap[sizeof(rfc1042_header)];
4135 } *payload __aligned(2);
4139 } addrs __aligned(2);
4140 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4142 if (fast_rx->uses_rss)
4143 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4145 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4146 * to a common data structure; drivers can implement that per queue
4147 * but we don't have that information in mac80211
4149 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4152 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4154 /* If using encryption, we also need to have:
4155 * - PN_VALIDATED: similar, but the implementation is tricky
4156 * - DECRYPTED: necessary for PN_VALIDATED
4159 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4162 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4165 if (unlikely(ieee80211_is_frag(hdr)))
4168 /* Since our interface address cannot be multicast, this
4169 * implicitly also rejects multicast frames without the
4172 * We shouldn't get any *data* frames not addressed to us
4173 * (AP mode will accept multicast *management* frames), but
4174 * punting here will make it go through the full checks in
4175 * ieee80211_accept_frame().
4177 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4180 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4181 IEEE80211_FCTL_TODS)) !=
4182 fast_rx->expected_ds_bits)
4185 /* assign the key to drop unencrypted frames (later)
4186 * and strip the IV/MIC if necessary
4188 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4189 /* GCMP header length is the same */
4190 snap_offs += IEEE80211_CCMP_HDR_LEN;
4193 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4194 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4197 payload = (void *)(skb->data + snap_offs);
4199 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4202 /* Don't handle these here since they require special code.
4203 * Accept AARP and IPX even though they should come with a
4204 * bridge-tunnel header - but if we get them this way then
4205 * there's little point in discarding them.
4207 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4208 payload->proto == fast_rx->control_port_protocol))
4212 /* after this point, don't punt to the slowpath! */
4214 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4215 pskb_trim(skb, skb->len - fast_rx->icv_len))
4218 if (unlikely(fast_rx->sta_notify)) {
4219 ieee80211_sta_rx_notify(rx->sdata, hdr);
4220 fast_rx->sta_notify = false;
4223 /* statistics part of ieee80211_rx_h_sta_process() */
4224 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4225 stats->last_signal = status->signal;
4226 if (!fast_rx->uses_rss)
4227 ewma_signal_add(&sta->rx_stats_avg.signal,
4231 if (status->chains) {
4234 stats->chains = status->chains;
4235 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4236 int signal = status->chain_signal[i];
4238 if (!(status->chains & BIT(i)))
4241 stats->chain_signal_last[i] = signal;
4242 if (!fast_rx->uses_rss)
4243 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4247 /* end of statistics */
4249 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4252 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4253 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4260 stats->last_rx = jiffies;
4261 stats->last_rate = sta_stats_encode_rate(status);
4266 /* do the header conversion - first grab the addresses */
4267 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4268 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4269 /* remove the SNAP but leave the ethertype */
4270 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4271 /* push the addresses in front */
4272 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4274 skb->dev = fast_rx->dev;
4276 ieee80211_rx_stats(fast_rx->dev, skb->len);
4278 /* The seqno index has the same property as needed
4279 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4280 * for non-QoS-data frames. Here we know it's a data
4281 * frame, so count MSDUs.
4283 u64_stats_update_begin(&stats->syncp);
4284 stats->msdu[rx->seqno_idx]++;
4285 stats->bytes += orig_len;
4286 u64_stats_update_end(&stats->syncp);
4288 if (fast_rx->internal_forward) {
4289 struct sk_buff *xmit_skb = NULL;
4290 if (is_multicast_ether_addr(addrs.da)) {
4291 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4292 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4293 sta_info_get(rx->sdata, addrs.da)) {
4300 * Send to wireless media and increase priority by 256
4301 * to keep the received priority instead of
4302 * reclassifying the frame (see cfg80211_classify8021d).
4304 xmit_skb->priority += 256;
4305 xmit_skb->protocol = htons(ETH_P_802_3);
4306 skb_reset_network_header(xmit_skb);
4307 skb_reset_mac_header(xmit_skb);
4308 dev_queue_xmit(xmit_skb);
4315 /* deliver to local stack */
4316 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4317 memset(skb->cb, 0, sizeof(skb->cb));
4319 napi_gro_receive(rx->napi, skb);
4321 netif_receive_skb(skb);
4331 * This function returns whether or not the SKB
4332 * was destined for RX processing or not, which,
4333 * if consume is true, is equivalent to whether
4334 * or not the skb was consumed.
4336 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4337 struct sk_buff *skb, bool consume)
4339 struct ieee80211_local *local = rx->local;
4340 struct ieee80211_sub_if_data *sdata = rx->sdata;
4344 /* See if we can do fast-rx; if we have to copy we already lost,
4345 * so punt in that case. We should never have to deliver a data
4346 * frame to multiple interfaces anyway.
4348 * We skip the ieee80211_accept_frame() call and do the necessary
4349 * checking inside ieee80211_invoke_fast_rx().
4351 if (consume && rx->sta) {
4352 struct ieee80211_fast_rx *fast_rx;
4354 fast_rx = rcu_dereference(rx->sta->fast_rx);
4355 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4359 if (!ieee80211_accept_frame(rx))
4363 skb = skb_copy(skb, GFP_ATOMIC);
4365 if (net_ratelimit())
4366 wiphy_debug(local->hw.wiphy,
4367 "failed to copy skb for %s\n",
4375 ieee80211_invoke_rx_handlers(rx);
4380 * This is the actual Rx frames handler. as it belongs to Rx path it must
4381 * be called with rcu_read_lock protection.
4383 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4384 struct ieee80211_sta *pubsta,
4385 struct sk_buff *skb,
4386 struct napi_struct *napi)
4388 struct ieee80211_local *local = hw_to_local(hw);
4389 struct ieee80211_sub_if_data *sdata;
4390 struct ieee80211_hdr *hdr;
4392 struct ieee80211_rx_data rx;
4393 struct ieee80211_sub_if_data *prev;
4394 struct rhlist_head *tmp;
4397 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4398 memset(&rx, 0, sizeof(rx));
4403 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4404 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4406 if (ieee80211_is_mgmt(fc)) {
4407 /* drop frame if too short for header */
4408 if (skb->len < ieee80211_hdrlen(fc))
4411 err = skb_linearize(skb);
4413 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4421 hdr = (struct ieee80211_hdr *)skb->data;
4422 ieee80211_parse_qos(&rx);
4423 ieee80211_verify_alignment(&rx);
4425 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4426 ieee80211_is_beacon(hdr->frame_control)))
4427 ieee80211_scan_rx(local, skb);
4429 if (ieee80211_is_data(fc)) {
4430 struct sta_info *sta, *prev_sta;
4433 rx.sta = container_of(pubsta, struct sta_info, sta);
4434 rx.sdata = rx.sta->sdata;
4435 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4442 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4449 rx.sdata = prev_sta->sdata;
4450 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4457 rx.sdata = prev_sta->sdata;
4459 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4467 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4468 if (!ieee80211_sdata_running(sdata))
4471 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4472 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4476 * frame is destined for this interface, but if it's
4477 * not also for the previous one we handle that after
4478 * the loop to avoid copying the SKB once too much
4486 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4488 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4494 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4497 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4506 * This is the receive path handler. It is called by a low level driver when an
4507 * 802.11 MPDU is received from the hardware.
4509 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4510 struct sk_buff *skb, struct napi_struct *napi)
4512 struct ieee80211_local *local = hw_to_local(hw);
4513 struct ieee80211_rate *rate = NULL;
4514 struct ieee80211_supported_band *sband;
4515 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4517 WARN_ON_ONCE(softirq_count() == 0);
4519 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4522 sband = local->hw.wiphy->bands[status->band];
4523 if (WARN_ON(!sband))
4527 * If we're suspending, it is possible although not too likely
4528 * that we'd be receiving frames after having already partially
4529 * quiesced the stack. We can't process such frames then since
4530 * that might, for example, cause stations to be added or other
4531 * driver callbacks be invoked.
4533 if (unlikely(local->quiescing || local->suspended))
4536 /* We might be during a HW reconfig, prevent Rx for the same reason */
4537 if (unlikely(local->in_reconfig))
4541 * The same happens when we're not even started,
4542 * but that's worth a warning.
4544 if (WARN_ON(!local->started))
4547 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4549 * Validate the rate, unless a PLCP error means that
4550 * we probably can't have a valid rate here anyway.
4553 switch (status->encoding) {
4556 * rate_idx is MCS index, which can be [0-76]
4559 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4561 * Anything else would be some sort of driver or
4562 * hardware error. The driver should catch hardware
4565 if (WARN(status->rate_idx > 76,
4566 "Rate marked as an HT rate but passed "
4567 "status->rate_idx is not "
4568 "an MCS index [0-76]: %d (0x%02x)\n",
4574 if (WARN_ONCE(status->rate_idx > 9 ||
4577 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4578 status->rate_idx, status->nss))
4582 if (WARN_ONCE(status->rate_idx > 11 ||
4585 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4586 status->rate_idx, status->nss))
4593 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4595 rate = &sband->bitrates[status->rate_idx];
4599 status->rx_flags = 0;
4602 * key references and virtual interfaces are protected using RCU
4603 * and this requires that we are in a read-side RCU section during
4604 * receive processing
4609 * Frames with failed FCS/PLCP checksum are not returned,
4610 * all other frames are returned without radiotap header
4611 * if it was previously present.
4612 * Also, frames with less than 16 bytes are dropped.
4614 skb = ieee80211_rx_monitor(local, skb, rate);
4620 ieee80211_tpt_led_trig_rx(local,
4621 ((struct ieee80211_hdr *)skb->data)->frame_control,
4624 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4632 EXPORT_SYMBOL(ieee80211_rx_napi);
4634 /* This is a version of the rx handler that can be called from hard irq
4635 * context. Post the skb on the queue and schedule the tasklet */
4636 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4638 struct ieee80211_local *local = hw_to_local(hw);
4640 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4642 skb->pkt_type = IEEE80211_RX_MSG;
4643 skb_queue_tail(&local->skb_queue, skb);
4644 tasklet_schedule(&local->tasklet);
4646 EXPORT_SYMBOL(ieee80211_rx_irqsafe);