1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
9 * Copyright (C) 2018-2023 Intel Corporation
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <linux/kcov.h>
21 #include <linux/bitops.h>
22 #include <net/mac80211.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <asm/unaligned.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
37 * monitor mode reception
39 * This function cleans up the SKB, i.e. it removes all the stuff
40 * only useful for monitoring.
42 static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
43 unsigned int present_fcs_len,
44 unsigned int rtap_space)
46 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
47 struct ieee80211_hdr *hdr;
52 __pskb_trim(skb, skb->len - present_fcs_len);
53 pskb_pull(skb, rtap_space);
55 /* After pulling radiotap header, clear all flags that indicate
58 status->flag &= ~(RX_FLAG_RADIOTAP_TLV_AT_END |
59 RX_FLAG_RADIOTAP_LSIG |
60 RX_FLAG_RADIOTAP_HE_MU |
63 hdr = (void *)skb->data;
64 fc = hdr->frame_control;
67 * Remove the HT-Control field (if present) on management
68 * frames after we've sent the frame to monitoring. We
69 * (currently) don't need it, and don't properly parse
70 * frames with it present, due to the assumption of a
71 * fixed management header length.
73 if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
76 hdrlen = ieee80211_hdrlen(fc);
77 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
79 if (!pskb_may_pull(skb, hdrlen)) {
84 memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
85 hdrlen - IEEE80211_HT_CTL_LEN);
86 pskb_pull(skb, IEEE80211_HT_CTL_LEN);
91 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
92 unsigned int rtap_space)
94 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
95 struct ieee80211_hdr *hdr;
97 hdr = (void *)(skb->data + rtap_space);
99 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
100 RX_FLAG_FAILED_PLCP_CRC |
101 RX_FLAG_ONLY_MONITOR |
105 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
108 if (ieee80211_is_ctl(hdr->frame_control) &&
109 !ieee80211_is_pspoll(hdr->frame_control) &&
110 !ieee80211_is_back_req(hdr->frame_control))
117 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
118 struct ieee80211_rx_status *status,
123 /* always present fields */
124 len = sizeof(struct ieee80211_radiotap_header) + 8;
126 /* allocate extra bitmaps */
128 len += 4 * hweight8(status->chains);
130 if (ieee80211_have_rx_timestamp(status)) {
134 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
137 /* antenna field, if we don't have per-chain info */
141 /* padding for RX_FLAGS if necessary */
144 if (status->encoding == RX_ENC_HT) /* HT info */
147 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
152 if (status->encoding == RX_ENC_VHT) {
157 if (local->hw.radiotap_timestamp.units_pos >= 0) {
162 if (status->encoding == RX_ENC_HE &&
163 status->flag & RX_FLAG_RADIOTAP_HE) {
166 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
169 if (status->encoding == RX_ENC_HE &&
170 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
173 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
176 if (status->flag & RX_FLAG_NO_PSDU)
179 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
182 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
185 if (status->chains) {
186 /* antenna and antenna signal fields */
187 len += 2 * hweight8(status->chains);
190 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
194 * The position to look at depends on the existence (or non-
195 * existence) of other elements, so take that into account...
197 if (status->flag & RX_FLAG_RADIOTAP_HE)
199 sizeof(struct ieee80211_radiotap_he);
200 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
202 sizeof(struct ieee80211_radiotap_he_mu);
203 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
205 sizeof(struct ieee80211_radiotap_lsig);
207 /* ensure 4 byte alignment for TLV */
210 /* TLVs until the mac header */
211 len += skb_mac_header(skb) - &skb->data[tlv_offset];
217 static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
219 struct sta_info *sta,
222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
225 status->link_valid = 1;
226 status->link_id = link_id;
228 status->link_valid = 0;
231 skb_queue_tail(&sdata->skb_queue, skb);
232 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
234 sta->deflink.rx_stats.packets++;
237 static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
239 struct sta_info *sta,
243 __ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
246 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
251 struct ieee80211_hdr_3addr hdr;
254 } __packed __aligned(2) action;
259 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
261 if (skb->len < rtap_space + sizeof(action) +
262 VHT_MUMIMO_GROUPS_DATA_LEN)
265 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
268 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
270 if (!ieee80211_is_action(action.hdr.frame_control))
273 if (action.category != WLAN_CATEGORY_VHT)
276 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
279 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
282 skb = skb_copy(skb, GFP_ATOMIC);
286 ieee80211_queue_skb_to_iface(sdata, -1, NULL, skb);
290 * ieee80211_add_rx_radiotap_header - add radiotap header
292 * add a radiotap header containing all the fields which the hardware provided.
295 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
297 struct ieee80211_rate *rate,
298 int rtap_len, bool has_fcs)
300 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
301 struct ieee80211_radiotap_header *rthdr;
306 u16 channel_flags = 0;
309 unsigned long chains = status->chains;
310 struct ieee80211_radiotap_he he = {};
311 struct ieee80211_radiotap_he_mu he_mu = {};
312 struct ieee80211_radiotap_lsig lsig = {};
314 if (status->flag & RX_FLAG_RADIOTAP_HE) {
315 he = *(struct ieee80211_radiotap_he *)skb->data;
316 skb_pull(skb, sizeof(he));
317 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
320 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
321 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
322 skb_pull(skb, sizeof(he_mu));
325 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
326 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
327 skb_pull(skb, sizeof(lsig));
330 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
331 /* data is pointer at tlv all other info was pulled off */
332 tlvs_len = skb_mac_header(skb) - skb->data;
336 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
339 rthdr = skb_push(skb, rtap_len - tlvs_len);
340 memset(rthdr, 0, rtap_len - tlvs_len);
341 it_present = &rthdr->it_present;
343 /* radiotap header, set always present flags */
344 rthdr->it_len = cpu_to_le16(rtap_len);
345 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
346 BIT(IEEE80211_RADIOTAP_CHANNEL) |
347 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
350 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
352 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
354 BIT(IEEE80211_RADIOTAP_EXT) |
355 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
356 put_unaligned_le32(it_present_val, it_present);
358 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
359 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
362 if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
363 it_present_val |= BIT(IEEE80211_RADIOTAP_TLV);
365 put_unaligned_le32(it_present_val, it_present);
367 /* This references through an offset into it_optional[] rather
368 * than via it_present otherwise later uses of pos will cause
369 * the compiler to think we have walked past the end of the
372 pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
374 /* the order of the following fields is important */
376 /* IEEE80211_RADIOTAP_TSFT */
377 if (ieee80211_have_rx_timestamp(status)) {
379 while ((pos - (u8 *)rthdr) & 7)
382 ieee80211_calculate_rx_timestamp(local, status,
385 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
389 /* IEEE80211_RADIOTAP_FLAGS */
390 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
391 *pos |= IEEE80211_RADIOTAP_F_FCS;
392 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
393 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
394 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
395 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
398 /* IEEE80211_RADIOTAP_RATE */
399 if (!rate || status->encoding != RX_ENC_LEGACY) {
401 * Without rate information don't add it. If we have,
402 * MCS information is a separate field in radiotap,
403 * added below. The byte here is needed as padding
404 * for the channel though, so initialise it to 0.
409 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
410 if (status->bw == RATE_INFO_BW_10)
412 else if (status->bw == RATE_INFO_BW_5)
414 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
418 /* IEEE80211_RADIOTAP_CHANNEL */
419 /* TODO: frequency offset in KHz */
420 put_unaligned_le16(status->freq, pos);
422 if (status->bw == RATE_INFO_BW_10)
423 channel_flags |= IEEE80211_CHAN_HALF;
424 else if (status->bw == RATE_INFO_BW_5)
425 channel_flags |= IEEE80211_CHAN_QUARTER;
427 if (status->band == NL80211_BAND_5GHZ ||
428 status->band == NL80211_BAND_6GHZ)
429 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
430 else if (status->encoding != RX_ENC_LEGACY)
431 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
432 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
433 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
435 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
437 channel_flags |= IEEE80211_CHAN_2GHZ;
438 put_unaligned_le16(channel_flags, pos);
441 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
442 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
443 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
444 *pos = status->signal;
446 cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
450 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
452 if (!status->chains) {
453 /* IEEE80211_RADIOTAP_ANTENNA */
454 *pos = status->antenna;
458 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
460 /* IEEE80211_RADIOTAP_RX_FLAGS */
461 /* ensure 2 byte alignment for the 2 byte field as required */
462 if ((pos - (u8 *)rthdr) & 1)
464 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
465 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
466 put_unaligned_le16(rx_flags, pos);
469 if (status->encoding == RX_ENC_HT) {
472 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
473 *pos = local->hw.radiotap_mcs_details;
474 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
475 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
476 if (status->enc_flags & RX_ENC_FLAG_LDPC)
477 *pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
480 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
481 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
482 if (status->bw == RATE_INFO_BW_40)
483 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
484 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
485 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
486 if (status->enc_flags & RX_ENC_FLAG_LDPC)
487 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
488 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
489 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
491 *pos++ = status->rate_idx;
494 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
497 /* ensure 4 byte alignment */
498 while ((pos - (u8 *)rthdr) & 3)
501 cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
502 put_unaligned_le32(status->ampdu_reference, pos);
504 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
505 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
506 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
507 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
508 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
509 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
510 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
511 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
512 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
513 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
514 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
515 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
516 put_unaligned_le16(flags, pos);
518 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
519 *pos++ = status->ampdu_delimiter_crc;
525 if (status->encoding == RX_ENC_VHT) {
526 u16 known = local->hw.radiotap_vht_details;
528 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
529 put_unaligned_le16(known, pos);
532 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
533 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
534 /* in VHT, STBC is binary */
535 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
536 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
537 if (status->enc_flags & RX_ENC_FLAG_BF)
538 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
541 switch (status->bw) {
542 case RATE_INFO_BW_80:
545 case RATE_INFO_BW_160:
548 case RATE_INFO_BW_40:
555 *pos = (status->rate_idx << 4) | status->nss;
558 if (status->enc_flags & RX_ENC_FLAG_LDPC)
559 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
567 if (local->hw.radiotap_timestamp.units_pos >= 0) {
569 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
572 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
574 /* ensure 8 byte alignment */
575 while ((pos - (u8 *)rthdr) & 7)
578 put_unaligned_le64(status->device_timestamp, pos);
581 if (local->hw.radiotap_timestamp.accuracy >= 0) {
582 accuracy = local->hw.radiotap_timestamp.accuracy;
583 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
585 put_unaligned_le16(accuracy, pos);
588 *pos++ = local->hw.radiotap_timestamp.units_pos;
592 if (status->encoding == RX_ENC_HE &&
593 status->flag & RX_FLAG_RADIOTAP_HE) {
594 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
596 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
597 he.data6 |= HE_PREP(DATA6_NSTS,
598 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
600 he.data3 |= HE_PREP(DATA3_STBC, 1);
602 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
605 #define CHECK_GI(s) \
606 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
607 (int)NL80211_RATE_INFO_HE_GI_##s)
613 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
614 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
615 he.data3 |= HE_PREP(DATA3_CODING,
616 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
618 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
620 switch (status->bw) {
621 case RATE_INFO_BW_20:
622 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
623 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
625 case RATE_INFO_BW_40:
626 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
627 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
629 case RATE_INFO_BW_80:
630 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
631 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
633 case RATE_INFO_BW_160:
634 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
635 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
637 case RATE_INFO_BW_HE_RU:
638 #define CHECK_RU_ALLOC(s) \
639 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
640 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
648 CHECK_RU_ALLOC(2x996);
650 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
654 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
657 /* ensure 2 byte alignment */
658 while ((pos - (u8 *)rthdr) & 1)
660 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
661 memcpy(pos, &he, sizeof(he));
665 if (status->encoding == RX_ENC_HE &&
666 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
667 /* ensure 2 byte alignment */
668 while ((pos - (u8 *)rthdr) & 1)
670 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
671 memcpy(pos, &he_mu, sizeof(he_mu));
672 pos += sizeof(he_mu);
675 if (status->flag & RX_FLAG_NO_PSDU) {
677 cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
678 *pos++ = status->zero_length_psdu_type;
681 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
682 /* ensure 2 byte alignment */
683 while ((pos - (u8 *)rthdr) & 1)
685 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
686 memcpy(pos, &lsig, sizeof(lsig));
690 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
691 *pos++ = status->chain_signal[chain];
696 static struct sk_buff *
697 ieee80211_make_monitor_skb(struct ieee80211_local *local,
698 struct sk_buff **origskb,
699 struct ieee80211_rate *rate,
700 int rtap_space, bool use_origskb)
702 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
703 int rt_hdrlen, needed_headroom;
706 /* room for the radiotap header based on driver features */
707 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
708 needed_headroom = rt_hdrlen - rtap_space;
711 /* only need to expand headroom if necessary */
716 * This shouldn't trigger often because most devices have an
717 * RX header they pull before we get here, and that should
718 * be big enough for our radiotap information. We should
719 * probably export the length to drivers so that we can have
720 * them allocate enough headroom to start with.
722 if (skb_headroom(skb) < needed_headroom &&
723 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
729 * Need to make a copy and possibly remove radiotap header
730 * and FCS from the original.
732 skb = skb_copy_expand(*origskb, needed_headroom + NET_SKB_PAD,
739 /* prepend radiotap information */
740 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
742 skb_reset_mac_header(skb);
743 skb->ip_summed = CHECKSUM_UNNECESSARY;
744 skb->pkt_type = PACKET_OTHERHOST;
745 skb->protocol = htons(ETH_P_802_2);
751 * This function copies a received frame to all monitor interfaces and
752 * returns a cleaned-up SKB that no longer includes the FCS nor the
753 * radiotap header the driver might have added.
755 static struct sk_buff *
756 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
757 struct ieee80211_rate *rate)
759 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
760 struct ieee80211_sub_if_data *sdata;
761 struct sk_buff *monskb = NULL;
762 int present_fcs_len = 0;
763 unsigned int rtap_space = 0;
764 struct ieee80211_sub_if_data *monitor_sdata =
765 rcu_dereference(local->monitor_sdata);
766 bool only_monitor = false;
767 unsigned int min_head_len;
769 if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END &&
770 !skb_mac_header_was_set(origskb))) {
771 /* with this skb no way to know where frame payload starts */
772 dev_kfree_skb(origskb);
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 (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
786 rtap_space += skb_mac_header(origskb) - &origskb->data[rtap_space];
788 min_head_len = rtap_space;
791 * First, we may need to make a copy of the skb because
792 * (1) we need to modify it for radiotap (if not present), and
793 * (2) the other RX handlers will modify the skb we got.
795 * We don't need to, of course, if we aren't going to return
796 * the SKB because it has a bad FCS/PLCP checksum.
799 if (!(status->flag & RX_FLAG_NO_PSDU)) {
800 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
801 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
804 dev_kfree_skb(origskb);
807 present_fcs_len = FCS_LEN;
810 /* also consider the hdr->frame_control */
814 /* ensure that the expected data elements are in skb head */
815 if (!pskb_may_pull(origskb, min_head_len)) {
816 dev_kfree_skb(origskb);
820 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
822 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
824 dev_kfree_skb(origskb);
828 return ieee80211_clean_skb(origskb, present_fcs_len,
832 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
834 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
835 bool last_monitor = list_is_last(&sdata->u.mntr.list,
839 monskb = ieee80211_make_monitor_skb(local, &origskb,
851 skb = skb_clone(monskb, GFP_ATOMIC);
855 skb->dev = sdata->dev;
856 dev_sw_netstats_rx_add(skb->dev, skb->len);
857 netif_receive_skb(skb);
865 /* this happens if last_monitor was erroneously false */
866 dev_kfree_skb(monskb);
872 return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space);
875 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
877 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
878 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
879 int tid, seqno_idx, security_idx;
881 /* does the frame have a qos control field? */
882 if (ieee80211_is_data_qos(hdr->frame_control)) {
883 u8 *qc = ieee80211_get_qos_ctl(hdr);
884 /* frame has qos control */
885 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
886 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
887 status->rx_flags |= IEEE80211_RX_AMSDU;
893 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
895 * Sequence numbers for management frames, QoS data
896 * frames with a broadcast/multicast address in the
897 * Address 1 field, and all non-QoS data frames sent
898 * by QoS STAs are assigned using an additional single
899 * modulo-4096 counter, [...]
901 * We also use that counter for non-QoS STAs.
903 seqno_idx = IEEE80211_NUM_TIDS;
905 if (ieee80211_is_mgmt(hdr->frame_control))
906 security_idx = IEEE80211_NUM_TIDS;
910 rx->seqno_idx = seqno_idx;
911 rx->security_idx = security_idx;
912 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
913 * For now, set skb->priority to 0 for other cases. */
914 rx->skb->priority = (tid > 7) ? 0 : tid;
918 * DOC: Packet alignment
920 * Drivers always need to pass packets that are aligned to two-byte boundaries
923 * Additionally, should, if possible, align the payload data in a way that
924 * guarantees that the contained IP header is aligned to a four-byte
925 * boundary. In the case of regular frames, this simply means aligning the
926 * payload to a four-byte boundary (because either the IP header is directly
927 * contained, or IV/RFC1042 headers that have a length divisible by four are
928 * in front of it). If the payload data is not properly aligned and the
929 * architecture doesn't support efficient unaligned operations, mac80211
930 * will align the data.
932 * With A-MSDU frames, however, the payload data address must yield two modulo
933 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
934 * push the IP header further back to a multiple of four again. Thankfully, the
935 * specs were sane enough this time around to require padding each A-MSDU
936 * subframe to a length that is a multiple of four.
938 * Padding like Atheros hardware adds which is between the 802.11 header and
939 * the payload is not supported, the driver is required to move the 802.11
940 * header to be directly in front of the payload in that case.
942 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
944 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
945 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
952 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
954 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
956 if (is_multicast_ether_addr(hdr->addr1))
959 return ieee80211_is_robust_mgmt_frame(skb);
963 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
965 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
967 if (!is_multicast_ether_addr(hdr->addr1))
970 return ieee80211_is_robust_mgmt_frame(skb);
974 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
975 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
977 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
978 struct ieee80211_mmie *mmie;
979 struct ieee80211_mmie_16 *mmie16;
981 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
984 if (!ieee80211_is_robust_mgmt_frame(skb) &&
985 !ieee80211_is_beacon(hdr->frame_control))
986 return -1; /* not a robust management frame */
988 mmie = (struct ieee80211_mmie *)
989 (skb->data + skb->len - sizeof(*mmie));
990 if (mmie->element_id == WLAN_EID_MMIE &&
991 mmie->length == sizeof(*mmie) - 2)
992 return le16_to_cpu(mmie->key_id);
994 mmie16 = (struct ieee80211_mmie_16 *)
995 (skb->data + skb->len - sizeof(*mmie16));
996 if (skb->len >= 24 + sizeof(*mmie16) &&
997 mmie16->element_id == WLAN_EID_MMIE &&
998 mmie16->length == sizeof(*mmie16) - 2)
999 return le16_to_cpu(mmie16->key_id);
1004 static int ieee80211_get_keyid(struct sk_buff *skb)
1006 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1007 __le16 fc = hdr->frame_control;
1008 int hdrlen = ieee80211_hdrlen(fc);
1011 /* WEP, TKIP, CCMP and GCMP */
1012 if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
1015 skb_copy_bits(skb, hdrlen + 3, &keyid, 1);
1022 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1024 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1025 char *dev_addr = rx->sdata->vif.addr;
1027 if (ieee80211_is_data(hdr->frame_control)) {
1028 if (is_multicast_ether_addr(hdr->addr1)) {
1029 if (ieee80211_has_tods(hdr->frame_control) ||
1030 !ieee80211_has_fromds(hdr->frame_control))
1031 return RX_DROP_MONITOR;
1032 if (ether_addr_equal(hdr->addr3, dev_addr))
1033 return RX_DROP_MONITOR;
1035 if (!ieee80211_has_a4(hdr->frame_control))
1036 return RX_DROP_MONITOR;
1037 if (ether_addr_equal(hdr->addr4, dev_addr))
1038 return RX_DROP_MONITOR;
1042 /* If there is not an established peer link and this is not a peer link
1043 * establisment frame, beacon or probe, drop the frame.
1046 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1047 struct ieee80211_mgmt *mgmt;
1049 if (!ieee80211_is_mgmt(hdr->frame_control))
1050 return RX_DROP_MONITOR;
1052 if (ieee80211_is_action(hdr->frame_control)) {
1055 /* make sure category field is present */
1056 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1057 return RX_DROP_MONITOR;
1059 mgmt = (struct ieee80211_mgmt *)hdr;
1060 category = mgmt->u.action.category;
1061 if (category != WLAN_CATEGORY_MESH_ACTION &&
1062 category != WLAN_CATEGORY_SELF_PROTECTED)
1063 return RX_DROP_MONITOR;
1067 if (ieee80211_is_probe_req(hdr->frame_control) ||
1068 ieee80211_is_probe_resp(hdr->frame_control) ||
1069 ieee80211_is_beacon(hdr->frame_control) ||
1070 ieee80211_is_auth(hdr->frame_control))
1073 return RX_DROP_MONITOR;
1079 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1082 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1083 struct sk_buff *tail = skb_peek_tail(frames);
1084 struct ieee80211_rx_status *status;
1086 if (tid_agg_rx->reorder_buf_filtered &&
1087 tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1093 status = IEEE80211_SKB_RXCB(tail);
1094 if (status->flag & RX_FLAG_AMSDU_MORE)
1100 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1101 struct tid_ampdu_rx *tid_agg_rx,
1103 struct sk_buff_head *frames)
1105 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1106 struct sk_buff *skb;
1107 struct ieee80211_rx_status *status;
1109 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1111 if (skb_queue_empty(skb_list))
1114 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1115 __skb_queue_purge(skb_list);
1119 /* release frames from the reorder ring buffer */
1120 tid_agg_rx->stored_mpdu_num--;
1121 while ((skb = __skb_dequeue(skb_list))) {
1122 status = IEEE80211_SKB_RXCB(skb);
1123 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1124 __skb_queue_tail(frames, skb);
1128 if (tid_agg_rx->reorder_buf_filtered)
1129 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1130 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1133 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1134 struct tid_ampdu_rx *tid_agg_rx,
1136 struct sk_buff_head *frames)
1140 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1142 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1143 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1144 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1150 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1151 * the skb was added to the buffer longer than this time ago, the earlier
1152 * frames that have not yet been received are assumed to be lost and the skb
1153 * can be released for processing. This may also release other skb's from the
1154 * reorder buffer if there are no additional gaps between the frames.
1156 * Callers must hold tid_agg_rx->reorder_lock.
1158 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1160 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1161 struct tid_ampdu_rx *tid_agg_rx,
1162 struct sk_buff_head *frames)
1166 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1168 /* release the buffer until next missing frame */
1169 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1170 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1171 tid_agg_rx->stored_mpdu_num) {
1173 * No buffers ready to be released, but check whether any
1174 * frames in the reorder buffer have timed out.
1177 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1178 j = (j + 1) % tid_agg_rx->buf_size) {
1179 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1184 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1185 HT_RX_REORDER_BUF_TIMEOUT))
1186 goto set_release_timer;
1188 /* don't leave incomplete A-MSDUs around */
1189 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1190 i = (i + 1) % tid_agg_rx->buf_size)
1191 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1193 ht_dbg_ratelimited(sdata,
1194 "release an RX reorder frame due to timeout on earlier frames\n");
1195 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1199 * Increment the head seq# also for the skipped slots.
1201 tid_agg_rx->head_seq_num =
1202 (tid_agg_rx->head_seq_num +
1203 skipped) & IEEE80211_SN_MASK;
1206 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1207 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1209 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1212 if (tid_agg_rx->stored_mpdu_num) {
1213 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1215 for (; j != (index - 1) % tid_agg_rx->buf_size;
1216 j = (j + 1) % tid_agg_rx->buf_size) {
1217 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1223 if (!tid_agg_rx->removed)
1224 mod_timer(&tid_agg_rx->reorder_timer,
1225 tid_agg_rx->reorder_time[j] + 1 +
1226 HT_RX_REORDER_BUF_TIMEOUT);
1228 del_timer(&tid_agg_rx->reorder_timer);
1233 * As this function belongs to the RX path it must be under
1234 * rcu_read_lock protection. It returns false if the frame
1235 * can be processed immediately, true if it was consumed.
1237 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1238 struct tid_ampdu_rx *tid_agg_rx,
1239 struct sk_buff *skb,
1240 struct sk_buff_head *frames)
1242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1243 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1244 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1245 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1246 u16 head_seq_num, buf_size;
1250 spin_lock(&tid_agg_rx->reorder_lock);
1253 * Offloaded BA sessions have no known starting sequence number so pick
1254 * one from first Rxed frame for this tid after BA was started.
1256 if (unlikely(tid_agg_rx->auto_seq)) {
1257 tid_agg_rx->auto_seq = false;
1258 tid_agg_rx->ssn = mpdu_seq_num;
1259 tid_agg_rx->head_seq_num = mpdu_seq_num;
1262 buf_size = tid_agg_rx->buf_size;
1263 head_seq_num = tid_agg_rx->head_seq_num;
1266 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1269 if (unlikely(!tid_agg_rx->started)) {
1270 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1274 tid_agg_rx->started = true;
1277 /* frame with out of date sequence number */
1278 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1284 * If frame the sequence number exceeds our buffering window
1285 * size release some previous frames to make room for this one.
1287 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1288 head_seq_num = ieee80211_sn_inc(
1289 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1290 /* release stored frames up to new head to stack */
1291 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1292 head_seq_num, frames);
1295 /* Now the new frame is always in the range of the reordering buffer */
1297 index = mpdu_seq_num % tid_agg_rx->buf_size;
1299 /* check if we already stored this frame */
1300 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1306 * If the current MPDU is in the right order and nothing else
1307 * is stored we can process it directly, no need to buffer it.
1308 * If it is first but there's something stored, we may be able
1309 * to release frames after this one.
1311 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1312 tid_agg_rx->stored_mpdu_num == 0) {
1313 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1314 tid_agg_rx->head_seq_num =
1315 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1320 /* put the frame in the reordering buffer */
1321 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1322 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1323 tid_agg_rx->reorder_time[index] = jiffies;
1324 tid_agg_rx->stored_mpdu_num++;
1325 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1329 spin_unlock(&tid_agg_rx->reorder_lock);
1334 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1335 * true if the MPDU was buffered, false if it should be processed.
1337 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1338 struct sk_buff_head *frames)
1340 struct sk_buff *skb = rx->skb;
1341 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1342 struct sta_info *sta = rx->sta;
1343 struct tid_ampdu_rx *tid_agg_rx;
1347 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1348 is_multicast_ether_addr(hdr->addr1))
1352 * filter the QoS data rx stream according to
1353 * STA/TID and check if this STA/TID is on aggregation
1359 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1360 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1361 tid = ieee80211_get_tid(hdr);
1363 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1365 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1366 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1367 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1368 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1369 WLAN_BACK_RECIPIENT,
1370 WLAN_REASON_QSTA_REQUIRE_SETUP);
1374 /* qos null data frames are excluded */
1375 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1378 /* not part of a BA session */
1379 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1382 /* new, potentially un-ordered, ampdu frame - process it */
1384 /* reset session timer */
1385 if (tid_agg_rx->timeout)
1386 tid_agg_rx->last_rx = jiffies;
1388 /* if this mpdu is fragmented - terminate rx aggregation session */
1389 sc = le16_to_cpu(hdr->seq_ctrl);
1390 if (sc & IEEE80211_SCTL_FRAG) {
1391 ieee80211_queue_skb_to_iface(rx->sdata, rx->link_id, NULL, skb);
1396 * No locking needed -- we will only ever process one
1397 * RX packet at a time, and thus own tid_agg_rx. All
1398 * other code manipulating it needs to (and does) make
1399 * sure that we cannot get to it any more before doing
1402 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1407 __skb_queue_tail(frames, skb);
1410 static ieee80211_rx_result debug_noinline
1411 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1414 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1416 if (status->flag & RX_FLAG_DUP_VALIDATED)
1420 * Drop duplicate 802.11 retransmissions
1421 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1424 if (rx->skb->len < 24)
1427 if (ieee80211_is_ctl(hdr->frame_control) ||
1428 ieee80211_is_any_nullfunc(hdr->frame_control) ||
1429 is_multicast_ether_addr(hdr->addr1))
1435 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1436 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1437 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1438 rx->link_sta->rx_stats.num_duplicates++;
1439 return RX_DROP_U_DUP;
1440 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1441 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1447 static ieee80211_rx_result debug_noinline
1448 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1450 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1452 /* Drop disallowed frame classes based on STA auth/assoc state;
1453 * IEEE 802.11, Chap 5.5.
1455 * mac80211 filters only based on association state, i.e. it drops
1456 * Class 3 frames from not associated stations. hostapd sends
1457 * deauth/disassoc frames when needed. In addition, hostapd is
1458 * responsible for filtering on both auth and assoc states.
1461 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1462 return ieee80211_rx_mesh_check(rx);
1464 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1465 ieee80211_is_pspoll(hdr->frame_control)) &&
1466 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1467 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1468 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1470 * accept port control frames from the AP even when it's not
1471 * yet marked ASSOC to prevent a race where we don't set the
1472 * assoc bit quickly enough before it sends the first frame
1474 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1475 ieee80211_is_data_present(hdr->frame_control)) {
1476 unsigned int hdrlen;
1479 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1481 if (rx->skb->len < hdrlen + 8)
1482 return RX_DROP_MONITOR;
1484 skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2);
1485 if (ethertype == rx->sdata->control_port_protocol)
1489 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1490 cfg80211_rx_spurious_frame(rx->sdata->dev,
1493 return RX_DROP_U_SPURIOUS;
1495 return RX_DROP_MONITOR;
1502 static ieee80211_rx_result debug_noinline
1503 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1505 struct ieee80211_local *local;
1506 struct ieee80211_hdr *hdr;
1507 struct sk_buff *skb;
1511 hdr = (struct ieee80211_hdr *) skb->data;
1513 if (!local->pspolling)
1516 if (!ieee80211_has_fromds(hdr->frame_control))
1517 /* this is not from AP */
1520 if (!ieee80211_is_data(hdr->frame_control))
1523 if (!ieee80211_has_moredata(hdr->frame_control)) {
1524 /* AP has no more frames buffered for us */
1525 local->pspolling = false;
1529 /* more data bit is set, let's request a new frame from the AP */
1530 ieee80211_send_pspoll(local, rx->sdata);
1535 static void sta_ps_start(struct sta_info *sta)
1537 struct ieee80211_sub_if_data *sdata = sta->sdata;
1538 struct ieee80211_local *local = sdata->local;
1542 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1543 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1544 ps = &sdata->bss->ps;
1548 atomic_inc(&ps->num_sta_ps);
1549 set_sta_flag(sta, WLAN_STA_PS_STA);
1550 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1551 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1552 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1553 sta->sta.addr, sta->sta.aid);
1555 ieee80211_clear_fast_xmit(sta);
1557 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1558 struct ieee80211_txq *txq = sta->sta.txq[tid];
1559 struct txq_info *txqi = to_txq_info(txq);
1561 spin_lock(&local->active_txq_lock[txq->ac]);
1562 if (!list_empty(&txqi->schedule_order))
1563 list_del_init(&txqi->schedule_order);
1564 spin_unlock(&local->active_txq_lock[txq->ac]);
1566 if (txq_has_queue(txq))
1567 set_bit(tid, &sta->txq_buffered_tids);
1569 clear_bit(tid, &sta->txq_buffered_tids);
1573 static void sta_ps_end(struct sta_info *sta)
1575 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1576 sta->sta.addr, sta->sta.aid);
1578 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1580 * Clear the flag only if the other one is still set
1581 * so that the TX path won't start TX'ing new frames
1582 * directly ... In the case that the driver flag isn't
1583 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1585 clear_sta_flag(sta, WLAN_STA_PS_STA);
1586 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1587 sta->sta.addr, sta->sta.aid);
1591 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1592 clear_sta_flag(sta, WLAN_STA_PS_STA);
1593 ieee80211_sta_ps_deliver_wakeup(sta);
1596 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1598 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1601 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1603 /* Don't let the same PS state be set twice */
1604 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1605 if ((start && in_ps) || (!start && !in_ps))
1615 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1617 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1619 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1621 if (test_sta_flag(sta, WLAN_STA_SP))
1624 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1625 ieee80211_sta_ps_deliver_poll_response(sta);
1627 set_sta_flag(sta, WLAN_STA_PSPOLL);
1629 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1631 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1633 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1634 int ac = ieee80211_ac_from_tid(tid);
1637 * If this AC is not trigger-enabled do nothing unless the
1638 * driver is calling us after it already checked.
1640 * NB: This could/should check a separate bitmap of trigger-
1641 * enabled queues, but for now we only implement uAPSD w/o
1642 * TSPEC changes to the ACs, so they're always the same.
1644 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1645 tid != IEEE80211_NUM_TIDS)
1648 /* if we are in a service period, do nothing */
1649 if (test_sta_flag(sta, WLAN_STA_SP))
1652 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1653 ieee80211_sta_ps_deliver_uapsd(sta);
1655 set_sta_flag(sta, WLAN_STA_UAPSD);
1657 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1659 static ieee80211_rx_result debug_noinline
1660 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1662 struct ieee80211_sub_if_data *sdata = rx->sdata;
1663 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1664 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1669 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1670 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1674 * The device handles station powersave, so don't do anything about
1675 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1676 * it to mac80211 since they're handled.)
1678 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1682 * Don't do anything if the station isn't already asleep. In
1683 * the uAPSD case, the station will probably be marked asleep,
1684 * in the PS-Poll case the station must be confused ...
1686 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1689 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1690 ieee80211_sta_pspoll(&rx->sta->sta);
1692 /* Free PS Poll skb here instead of returning RX_DROP that would
1693 * count as an dropped frame. */
1694 dev_kfree_skb(rx->skb);
1697 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1698 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1699 ieee80211_has_pm(hdr->frame_control) &&
1700 (ieee80211_is_data_qos(hdr->frame_control) ||
1701 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1702 u8 tid = ieee80211_get_tid(hdr);
1704 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1710 static ieee80211_rx_result debug_noinline
1711 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1713 struct sta_info *sta = rx->sta;
1714 struct link_sta_info *link_sta = rx->link_sta;
1715 struct sk_buff *skb = rx->skb;
1716 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1717 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1720 if (!sta || !link_sta)
1724 * Update last_rx only for IBSS packets which are for the current
1725 * BSSID and for station already AUTHORIZED to avoid keeping the
1726 * current IBSS network alive in cases where other STAs start
1727 * using different BSSID. This will also give the station another
1728 * chance to restart the authentication/authorization in case
1729 * something went wrong the first time.
1731 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1732 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1733 NL80211_IFTYPE_ADHOC);
1734 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1735 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1736 link_sta->rx_stats.last_rx = jiffies;
1737 if (ieee80211_is_data_present(hdr->frame_control) &&
1738 !is_multicast_ether_addr(hdr->addr1))
1739 link_sta->rx_stats.last_rate =
1740 sta_stats_encode_rate(status);
1742 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1743 link_sta->rx_stats.last_rx = jiffies;
1744 } else if (!ieee80211_is_s1g_beacon(hdr->frame_control) &&
1745 !is_multicast_ether_addr(hdr->addr1)) {
1747 * Mesh beacons will update last_rx when if they are found to
1748 * match the current local configuration when processed.
1750 link_sta->rx_stats.last_rx = jiffies;
1751 if (ieee80211_is_data_present(hdr->frame_control))
1752 link_sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1755 link_sta->rx_stats.fragments++;
1757 u64_stats_update_begin(&link_sta->rx_stats.syncp);
1758 link_sta->rx_stats.bytes += rx->skb->len;
1759 u64_stats_update_end(&link_sta->rx_stats.syncp);
1761 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1762 link_sta->rx_stats.last_signal = status->signal;
1763 ewma_signal_add(&link_sta->rx_stats_avg.signal,
1767 if (status->chains) {
1768 link_sta->rx_stats.chains = status->chains;
1769 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1770 int signal = status->chain_signal[i];
1772 if (!(status->chains & BIT(i)))
1775 link_sta->rx_stats.chain_signal_last[i] = signal;
1776 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
1781 if (ieee80211_is_s1g_beacon(hdr->frame_control))
1785 * Change STA power saving mode only at the end of a frame
1786 * exchange sequence, and only for a data or management
1787 * frame as specified in IEEE 802.11-2016 11.2.3.2
1789 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1790 !ieee80211_has_morefrags(hdr->frame_control) &&
1791 !is_multicast_ether_addr(hdr->addr1) &&
1792 (ieee80211_is_mgmt(hdr->frame_control) ||
1793 ieee80211_is_data(hdr->frame_control)) &&
1794 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1795 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1796 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1797 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1798 if (!ieee80211_has_pm(hdr->frame_control))
1801 if (ieee80211_has_pm(hdr->frame_control))
1806 /* mesh power save support */
1807 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1808 ieee80211_mps_rx_h_sta_process(sta, hdr);
1811 * Drop (qos-)data::nullfunc frames silently, since they
1812 * are used only to control station power saving mode.
1814 if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
1815 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1818 * If we receive a 4-addr nullfunc frame from a STA
1819 * that was not moved to a 4-addr STA vlan yet send
1820 * the event to userspace and for older hostapd drop
1821 * the frame to the monitor interface.
1823 if (ieee80211_has_a4(hdr->frame_control) &&
1824 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1825 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1826 !rx->sdata->u.vlan.sta))) {
1827 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1828 cfg80211_rx_unexpected_4addr_frame(
1829 rx->sdata->dev, sta->sta.addr,
1831 return RX_DROP_M_UNEXPECTED_4ADDR_FRAME;
1834 * Update counter and free packet here to avoid
1835 * counting this as a dropped packed.
1837 link_sta->rx_stats.packets++;
1838 dev_kfree_skb(rx->skb);
1843 } /* ieee80211_rx_h_sta_process */
1845 static struct ieee80211_key *
1846 ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1848 struct ieee80211_key *key = NULL;
1851 /* Make sure key gets set if either BIGTK key index is set so that
1852 * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1853 * Beacon frames and Beacon frames that claim to use another BIGTK key
1854 * index (i.e., a key that we do not have).
1858 idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1861 if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1868 key = rcu_dereference(rx->link_sta->gtk[idx]);
1870 key = rcu_dereference(rx->link->gtk[idx]);
1871 if (!key && rx->link_sta)
1872 key = rcu_dereference(rx->link_sta->gtk[idx2]);
1874 key = rcu_dereference(rx->link->gtk[idx2]);
1879 static ieee80211_rx_result debug_noinline
1880 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1882 struct sk_buff *skb = rx->skb;
1883 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1884 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1886 ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL;
1887 struct ieee80211_key *sta_ptk = NULL;
1888 struct ieee80211_key *ptk_idx = NULL;
1889 int mmie_keyidx = -1;
1892 if (ieee80211_is_ext(hdr->frame_control))
1898 * There are five types of keys:
1899 * - GTK (group keys)
1900 * - IGTK (group keys for management frames)
1901 * - BIGTK (group keys for Beacon frames)
1902 * - PTK (pairwise keys)
1903 * - STK (station-to-station pairwise keys)
1905 * When selecting a key, we have to distinguish between multicast
1906 * (including broadcast) and unicast frames, the latter can only
1907 * use PTKs and STKs while the former always use GTKs, IGTKs, and
1908 * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1909 * then unicast frames can also use key indices like GTKs. Hence, if we
1910 * don't have a PTK/STK we check the key index for a WEP key.
1912 * Note that in a regular BSS, multicast frames are sent by the
1913 * AP only, associated stations unicast the frame to the AP first
1914 * which then multicasts it on their behalf.
1916 * There is also a slight problem in IBSS mode: GTKs are negotiated
1917 * with each station, that is something we don't currently handle.
1918 * The spec seems to expect that one negotiates the same key with
1919 * every station but there's no such requirement; VLANs could be
1923 /* start without a key */
1925 fc = hdr->frame_control;
1928 int keyid = rx->sta->ptk_idx;
1929 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1931 if (ieee80211_has_protected(fc) &&
1932 !(status->flag & RX_FLAG_IV_STRIPPED)) {
1933 keyid = ieee80211_get_keyid(rx->skb);
1935 if (unlikely(keyid < 0))
1936 return RX_DROP_U_NO_KEY_ID;
1938 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1942 if (!ieee80211_has_protected(fc))
1943 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1945 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1946 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1947 if ((status->flag & RX_FLAG_DECRYPTED) &&
1948 (status->flag & RX_FLAG_IV_STRIPPED))
1950 /* Skip decryption if the frame is not protected. */
1951 if (!ieee80211_has_protected(fc))
1953 } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1954 /* Broadcast/multicast robust management frame / BIP */
1955 if ((status->flag & RX_FLAG_DECRYPTED) &&
1956 (status->flag & RX_FLAG_IV_STRIPPED))
1959 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1960 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1961 NUM_DEFAULT_BEACON_KEYS) {
1963 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1966 return RX_DROP_M_BAD_BCN_KEYIDX;
1969 rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
1971 return RX_CONTINUE; /* Beacon protection not in use */
1972 } else if (mmie_keyidx >= 0) {
1973 /* Broadcast/multicast robust management frame / BIP */
1974 if ((status->flag & RX_FLAG_DECRYPTED) &&
1975 (status->flag & RX_FLAG_IV_STRIPPED))
1978 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1979 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1980 return RX_DROP_M_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
1982 if (ieee80211_is_group_privacy_action(skb) &&
1983 test_sta_flag(rx->sta, WLAN_STA_MFP))
1984 return RX_DROP_MONITOR;
1986 rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
1989 rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
1990 } else if (!ieee80211_has_protected(fc)) {
1992 * The frame was not protected, so skip decryption. However, we
1993 * need to set rx->key if there is a key that could have been
1994 * used so that the frame may be dropped if encryption would
1995 * have been expected.
1997 struct ieee80211_key *key = NULL;
2000 if (ieee80211_is_beacon(fc)) {
2001 key = ieee80211_rx_get_bigtk(rx, -1);
2002 } else if (ieee80211_is_mgmt(fc) &&
2003 is_multicast_ether_addr(hdr->addr1)) {
2004 key = rcu_dereference(rx->link->default_mgmt_key);
2007 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2008 key = rcu_dereference(rx->link_sta->gtk[i]);
2014 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2015 key = rcu_dereference(rx->link->gtk[i]);
2026 * The device doesn't give us the IV so we won't be
2027 * able to look up the key. That's ok though, we
2028 * don't need to decrypt the frame, we just won't
2029 * be able to keep statistics accurate.
2030 * Except for key threshold notifications, should
2031 * we somehow allow the driver to tell us which key
2032 * the hardware used if this flag is set?
2034 if ((status->flag & RX_FLAG_DECRYPTED) &&
2035 (status->flag & RX_FLAG_IV_STRIPPED))
2038 keyidx = ieee80211_get_keyid(rx->skb);
2040 if (unlikely(keyidx < 0))
2041 return RX_DROP_U_NO_KEY_ID;
2043 /* check per-station GTK first, if multicast packet */
2044 if (is_multicast_ether_addr(hdr->addr1) && rx->link_sta)
2045 rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2047 /* if not found, try default key */
2049 if (is_multicast_ether_addr(hdr->addr1))
2050 rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2052 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2055 * RSNA-protected unicast frames should always be
2056 * sent with pairwise or station-to-station keys,
2057 * but for WEP we allow using a key index as well.
2060 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2061 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2062 !is_multicast_ether_addr(hdr->addr1))
2068 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2069 return RX_DROP_MONITOR;
2071 /* TODO: add threshold stuff again */
2073 return RX_DROP_MONITOR;
2076 switch (rx->key->conf.cipher) {
2077 case WLAN_CIPHER_SUITE_WEP40:
2078 case WLAN_CIPHER_SUITE_WEP104:
2079 result = ieee80211_crypto_wep_decrypt(rx);
2081 case WLAN_CIPHER_SUITE_TKIP:
2082 result = ieee80211_crypto_tkip_decrypt(rx);
2084 case WLAN_CIPHER_SUITE_CCMP:
2085 result = ieee80211_crypto_ccmp_decrypt(
2086 rx, IEEE80211_CCMP_MIC_LEN);
2088 case WLAN_CIPHER_SUITE_CCMP_256:
2089 result = ieee80211_crypto_ccmp_decrypt(
2090 rx, IEEE80211_CCMP_256_MIC_LEN);
2092 case WLAN_CIPHER_SUITE_AES_CMAC:
2093 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2095 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2096 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2098 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2099 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2100 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2102 case WLAN_CIPHER_SUITE_GCMP:
2103 case WLAN_CIPHER_SUITE_GCMP_256:
2104 result = ieee80211_crypto_gcmp_decrypt(rx);
2107 result = RX_DROP_U_BAD_CIPHER;
2110 /* the hdr variable is invalid after the decrypt handlers */
2112 /* either the frame has been decrypted or will be dropped */
2113 status->flag |= RX_FLAG_DECRYPTED;
2115 if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
2117 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2118 skb->data, skb->len);
2123 void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2127 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2128 skb_queue_head_init(&cache->entries[i].skb_list);
2131 void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2135 for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2136 __skb_queue_purge(&cache->entries[i].skb_list);
2139 static inline struct ieee80211_fragment_entry *
2140 ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2141 unsigned int frag, unsigned int seq, int rx_queue,
2142 struct sk_buff **skb)
2144 struct ieee80211_fragment_entry *entry;
2146 entry = &cache->entries[cache->next++];
2147 if (cache->next >= IEEE80211_FRAGMENT_MAX)
2150 __skb_queue_purge(&entry->skb_list);
2152 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2154 entry->first_frag_time = jiffies;
2156 entry->rx_queue = rx_queue;
2157 entry->last_frag = frag;
2158 entry->check_sequential_pn = false;
2159 entry->extra_len = 0;
2164 static inline struct ieee80211_fragment_entry *
2165 ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2166 unsigned int frag, unsigned int seq,
2167 int rx_queue, struct ieee80211_hdr *hdr)
2169 struct ieee80211_fragment_entry *entry;
2173 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2174 struct ieee80211_hdr *f_hdr;
2175 struct sk_buff *f_skb;
2179 idx = IEEE80211_FRAGMENT_MAX - 1;
2181 entry = &cache->entries[idx];
2182 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2183 entry->rx_queue != rx_queue ||
2184 entry->last_frag + 1 != frag)
2187 f_skb = __skb_peek(&entry->skb_list);
2188 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2191 * Check ftype and addresses are equal, else check next fragment
2193 if (((hdr->frame_control ^ f_hdr->frame_control) &
2194 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2195 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2196 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2199 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2200 __skb_queue_purge(&entry->skb_list);
2209 static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2212 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2213 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2214 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2215 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2216 ieee80211_has_protected(fc);
2219 static ieee80211_rx_result debug_noinline
2220 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2222 struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2223 struct ieee80211_hdr *hdr;
2226 unsigned int frag, seq;
2227 struct ieee80211_fragment_entry *entry;
2228 struct sk_buff *skb;
2229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2231 hdr = (struct ieee80211_hdr *)rx->skb->data;
2232 fc = hdr->frame_control;
2234 if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2237 sc = le16_to_cpu(hdr->seq_ctrl);
2238 frag = sc & IEEE80211_SCTL_FRAG;
2241 cache = &rx->sta->frags;
2243 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2246 if (is_multicast_ether_addr(hdr->addr1))
2247 return RX_DROP_MONITOR;
2249 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2251 if (skb_linearize(rx->skb))
2252 return RX_DROP_U_OOM;
2255 * skb_linearize() might change the skb->data and
2256 * previously cached variables (in this case, hdr) need to
2257 * be refreshed with the new data.
2259 hdr = (struct ieee80211_hdr *)rx->skb->data;
2260 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2263 /* This is the first fragment of a new frame. */
2264 entry = ieee80211_reassemble_add(cache, frag, seq,
2265 rx->seqno_idx, &(rx->skb));
2266 if (requires_sequential_pn(rx, fc)) {
2267 int queue = rx->security_idx;
2269 /* Store CCMP/GCMP PN so that we can verify that the
2270 * next fragment has a sequential PN value.
2272 entry->check_sequential_pn = true;
2273 entry->is_protected = true;
2274 entry->key_color = rx->key->color;
2275 memcpy(entry->last_pn,
2276 rx->key->u.ccmp.rx_pn[queue],
2277 IEEE80211_CCMP_PN_LEN);
2278 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2280 offsetof(struct ieee80211_key,
2282 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2283 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2284 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2285 IEEE80211_GCMP_PN_LEN);
2286 } else if (rx->key &&
2287 (ieee80211_has_protected(fc) ||
2288 (status->flag & RX_FLAG_DECRYPTED))) {
2289 entry->is_protected = true;
2290 entry->key_color = rx->key->color;
2295 /* This is a fragment for a frame that should already be pending in
2296 * fragment cache. Add this fragment to the end of the pending entry.
2298 entry = ieee80211_reassemble_find(cache, frag, seq,
2299 rx->seqno_idx, hdr);
2301 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2302 return RX_DROP_MONITOR;
2305 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2306 * MPDU PN values are not incrementing in steps of 1."
2307 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2308 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2310 if (entry->check_sequential_pn) {
2312 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2314 if (!requires_sequential_pn(rx, fc))
2315 return RX_DROP_U_NONSEQ_PN;
2317 /* Prevent mixed key and fragment cache attacks */
2318 if (entry->key_color != rx->key->color)
2319 return RX_DROP_U_BAD_KEY_COLOR;
2321 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2322 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2328 rpn = rx->ccm_gcm.pn;
2329 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2330 return RX_DROP_U_REPLAY;
2331 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2332 } else if (entry->is_protected &&
2334 (!ieee80211_has_protected(fc) &&
2335 !(status->flag & RX_FLAG_DECRYPTED)) ||
2336 rx->key->color != entry->key_color)) {
2337 /* Drop this as a mixed key or fragment cache attack, even
2338 * if for TKIP Michael MIC should protect us, and WEP is a
2339 * lost cause anyway.
2341 return RX_DROP_U_EXPECT_DEFRAG_PROT;
2342 } else if (entry->is_protected && rx->key &&
2343 entry->key_color != rx->key->color &&
2344 (status->flag & RX_FLAG_DECRYPTED)) {
2345 return RX_DROP_U_BAD_KEY_COLOR;
2348 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2349 __skb_queue_tail(&entry->skb_list, rx->skb);
2350 entry->last_frag = frag;
2351 entry->extra_len += rx->skb->len;
2352 if (ieee80211_has_morefrags(fc)) {
2357 rx->skb = __skb_dequeue(&entry->skb_list);
2358 if (skb_tailroom(rx->skb) < entry->extra_len) {
2359 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2360 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2362 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2363 __skb_queue_purge(&entry->skb_list);
2364 return RX_DROP_U_OOM;
2367 while ((skb = __skb_dequeue(&entry->skb_list))) {
2368 skb_put_data(rx->skb, skb->data, skb->len);
2373 ieee80211_led_rx(rx->local);
2375 rx->link_sta->rx_stats.packets++;
2379 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2381 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2387 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2389 struct sk_buff *skb = rx->skb;
2390 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2393 * Pass through unencrypted frames if the hardware has
2394 * decrypted them already.
2396 if (status->flag & RX_FLAG_DECRYPTED)
2399 /* Drop unencrypted frames if key is set. */
2400 if (unlikely(!ieee80211_has_protected(fc) &&
2401 !ieee80211_is_any_nullfunc(fc) &&
2402 ieee80211_is_data(fc) && rx->key))
2408 static ieee80211_rx_result
2409 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2411 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2412 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2413 __le16 fc = mgmt->frame_control;
2416 * Pass through unencrypted frames if the hardware has
2417 * decrypted them already.
2419 if (status->flag & RX_FLAG_DECRYPTED)
2422 /* drop unicast protected dual (that wasn't protected) */
2423 if (ieee80211_is_action(fc) &&
2424 mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
2425 return RX_DROP_U_UNPROT_DUAL;
2427 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2428 if (unlikely(!ieee80211_has_protected(fc) &&
2429 ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) {
2430 if (ieee80211_is_deauth(fc) ||
2431 ieee80211_is_disassoc(fc)) {
2433 * Permit unprotected deauth/disassoc frames
2434 * during 4-way-HS (key is installed after HS).
2439 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2443 return RX_DROP_U_UNPROT_UCAST_MGMT;
2445 /* BIP does not use Protected field, so need to check MMIE */
2446 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2447 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2448 if (ieee80211_is_deauth(fc) ||
2449 ieee80211_is_disassoc(fc))
2450 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2453 return RX_DROP_U_UNPROT_MCAST_MGMT;
2455 if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2456 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2457 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2460 return RX_DROP_U_UNPROT_BEACON;
2463 * When using MFP, Action frames are not allowed prior to
2464 * having configured keys.
2466 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2467 ieee80211_is_robust_mgmt_frame(rx->skb)))
2468 return RX_DROP_U_UNPROT_ACTION;
2470 /* drop unicast public action frames when using MPF */
2471 if (is_unicast_ether_addr(mgmt->da) &&
2472 ieee80211_is_protected_dual_of_public_action(rx->skb))
2473 return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION;
2477 * Drop robust action frames before assoc regardless of MFP state,
2478 * after assoc we also have decided on MFP or not.
2480 if (ieee80211_is_action(fc) &&
2481 ieee80211_is_robust_mgmt_frame(rx->skb) &&
2482 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))
2483 return RX_DROP_U_UNPROT_ROBUST_ACTION;
2488 static ieee80211_rx_result
2489 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2491 struct ieee80211_sub_if_data *sdata = rx->sdata;
2492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2493 bool check_port_control = false;
2494 struct ethhdr *ehdr;
2497 *port_control = false;
2498 if (ieee80211_has_a4(hdr->frame_control) &&
2499 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2500 return RX_DROP_U_UNEXPECTED_VLAN_4ADDR;
2502 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2503 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2504 if (!sdata->u.mgd.use_4addr)
2505 return RX_DROP_U_UNEXPECTED_STA_4ADDR;
2506 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2507 check_port_control = true;
2510 if (is_multicast_ether_addr(hdr->addr1) &&
2511 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2512 return RX_DROP_U_UNEXPECTED_VLAN_MCAST;
2514 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2516 return RX_DROP_U_INVALID_8023;
2518 ehdr = (struct ethhdr *) rx->skb->data;
2519 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2520 *port_control = true;
2521 else if (check_port_control)
2522 return RX_DROP_U_NOT_PORT_CONTROL;
2527 bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2528 const u8 *addr, int *out_link_id)
2530 unsigned int link_id;
2532 /* non-MLO, or MLD address replaced by hardware */
2533 if (ether_addr_equal(sdata->vif.addr, addr))
2536 if (!ieee80211_vif_is_mld(&sdata->vif))
2539 for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2540 struct ieee80211_bss_conf *conf;
2542 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2546 if (ether_addr_equal(conf->addr, addr)) {
2548 *out_link_id = link_id;
2557 * requires that rx->skb is a frame with ethernet header
2559 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2561 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2562 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2563 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2566 * Allow EAPOL frames to us/the PAE group address regardless of
2567 * whether the frame was encrypted or not, and always disallow
2568 * all other destination addresses for them.
2570 if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2571 return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
2572 ether_addr_equal(ehdr->h_dest, pae_group_addr);
2574 if (ieee80211_802_1x_port_control(rx) ||
2575 ieee80211_drop_unencrypted(rx, fc))
2581 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2582 struct ieee80211_rx_data *rx)
2584 struct ieee80211_sub_if_data *sdata = rx->sdata;
2585 struct net_device *dev = sdata->dev;
2587 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2588 (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2589 !sdata->control_port_no_preauth)) &&
2590 sdata->control_port_over_nl80211)) {
2591 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2592 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2594 cfg80211_rx_control_port(dev, skb, noencrypt, rx->link_id);
2597 struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2599 memset(skb->cb, 0, sizeof(skb->cb));
2602 * 802.1X over 802.11 requires that the authenticator address
2603 * be used for EAPOL frames. However, 802.1X allows the use of
2604 * the PAE group address instead. If the interface is part of
2605 * a bridge and we pass the frame with the PAE group address,
2606 * then the bridge will forward it to the network (even if the
2607 * client was not associated yet), which isn't supposed to
2609 * To avoid that, rewrite the destination address to our own
2610 * address, so that the authenticator (e.g. hostapd) will see
2611 * the frame, but bridge won't forward it anywhere else. Note
2612 * that due to earlier filtering, the only other address can
2613 * be the PAE group address, unless the hardware allowed them
2614 * through in 802.3 offloaded mode.
2616 if (unlikely(skb->protocol == sdata->control_port_protocol &&
2617 !ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2618 ether_addr_copy(ehdr->h_dest, sdata->vif.addr);
2620 /* deliver to local stack */
2622 list_add_tail(&skb->list, rx->list);
2624 netif_receive_skb(skb);
2629 * requires that rx->skb is a frame with ethernet header
2632 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2634 struct ieee80211_sub_if_data *sdata = rx->sdata;
2635 struct net_device *dev = sdata->dev;
2636 struct sk_buff *skb, *xmit_skb;
2637 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2638 struct sta_info *dsta;
2643 dev_sw_netstats_rx_add(dev, skb->len);
2646 /* The seqno index has the same property as needed
2647 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2648 * for non-QoS-data frames. Here we know it's a data
2649 * frame, so count MSDUs.
2651 u64_stats_update_begin(&rx->link_sta->rx_stats.syncp);
2652 rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2653 u64_stats_update_end(&rx->link_sta->rx_stats.syncp);
2656 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2657 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2658 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2659 ehdr->h_proto != rx->sdata->control_port_protocol &&
2660 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2661 if (is_multicast_ether_addr(ehdr->h_dest) &&
2662 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2664 * send multicast frames both to higher layers in
2665 * local net stack and back to the wireless medium
2667 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2669 net_info_ratelimited("%s: failed to clone multicast frame\n",
2671 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2672 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2673 dsta = sta_info_get(sdata, ehdr->h_dest);
2676 * The destination station is associated to
2677 * this AP (in this VLAN), so send the frame
2678 * directly to it and do not pass it to local
2687 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2689 /* 'align' will only take the values 0 or 2 here since all
2690 * frames are required to be aligned to 2-byte boundaries
2691 * when being passed to mac80211; the code here works just
2692 * as well if that isn't true, but mac80211 assumes it can
2693 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2697 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2699 if (WARN_ON(skb_headroom(skb) < 3)) {
2703 u8 *data = skb->data;
2704 size_t len = skb_headlen(skb);
2706 memmove(skb->data, data, len);
2707 skb_set_tail_pointer(skb, len);
2714 skb->protocol = eth_type_trans(skb, dev);
2715 ieee80211_deliver_skb_to_local_stack(skb, rx);
2720 * Send to wireless media and increase priority by 256 to
2721 * keep the received priority instead of reclassifying
2722 * the frame (see cfg80211_classify8021d).
2724 xmit_skb->priority += 256;
2725 xmit_skb->protocol = htons(ETH_P_802_3);
2726 skb_reset_network_header(xmit_skb);
2727 skb_reset_mac_header(xmit_skb);
2728 dev_queue_xmit(xmit_skb);
2732 #ifdef CONFIG_MAC80211_MESH
2734 ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
2735 struct sk_buff *skb, int hdrlen)
2737 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2738 struct ieee80211_mesh_fast_tx *entry = NULL;
2739 struct ieee80211s_hdr *mesh_hdr;
2740 struct tid_ampdu_tx *tid_tx;
2741 struct sta_info *sta;
2745 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
2746 if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2747 entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
2748 else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
2749 entry = mesh_fast_tx_get(sdata, skb->data);
2753 sta = rcu_dereference(entry->mpath->next_hop);
2757 if (skb_linearize(skb))
2760 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2761 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2763 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2766 if (tid_tx->timeout)
2767 tid_tx->last_tx = jiffies;
2770 ieee80211_aggr_check(sdata, sta, skb);
2772 if (ieee80211_get_8023_tunnel_proto(skb->data + hdrlen,
2776 skb->protocol = htons(skb->len - hdrlen);
2777 skb_set_network_header(skb, hdrlen + 2);
2779 skb->dev = sdata->dev;
2780 memcpy(ð, skb->data, ETH_HLEN - 2);
2782 __ieee80211_xmit_fast(sdata, sta, &entry->fast_tx, skb, tid_tx,
2783 eth.h_dest, eth.h_source);
2784 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2785 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2791 static ieee80211_rx_result
2792 ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
2793 struct sk_buff *skb)
2795 #ifdef CONFIG_MAC80211_MESH
2796 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2797 struct ieee80211_local *local = sdata->local;
2798 uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
2799 struct ieee80211_hdr hdr = {
2800 .frame_control = cpu_to_le16(fc)
2802 struct ieee80211_hdr *fwd_hdr;
2803 struct ieee80211s_hdr *mesh_hdr;
2804 struct ieee80211_tx_info *info;
2805 struct sk_buff *fwd_skb;
2809 int hdrlen, mesh_hdrlen;
2812 if (!ieee80211_vif_is_mesh(&sdata->vif))
2815 if (!pskb_may_pull(skb, sizeof(*eth) + 6))
2816 return RX_DROP_MONITOR;
2818 mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
2819 mesh_hdrlen = ieee80211_get_mesh_hdrlen(mesh_hdr);
2821 if (!pskb_may_pull(skb, sizeof(*eth) + mesh_hdrlen))
2822 return RX_DROP_MONITOR;
2824 eth = (struct ethhdr *)skb->data;
2825 multicast = is_multicast_ether_addr(eth->h_dest);
2827 mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
2829 return RX_DROP_MONITOR;
2831 /* frame is in RMC, don't forward */
2832 if (is_multicast_ether_addr(eth->h_dest) &&
2833 mesh_rmc_check(sdata, eth->h_source, mesh_hdr))
2834 return RX_DROP_MONITOR;
2836 /* forward packet */
2837 if (sdata->crypto_tx_tailroom_needed_cnt)
2838 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2840 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2841 struct mesh_path *mppath;
2843 bool update = false;
2846 proxied_addr = mesh_hdr->eaddr1;
2847 else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2848 /* has_a4 already checked in ieee80211_rx_mesh_check */
2849 proxied_addr = mesh_hdr->eaddr2;
2851 return RX_DROP_MONITOR;
2854 mppath = mpp_path_lookup(sdata, proxied_addr);
2856 mpp_path_add(sdata, proxied_addr, eth->h_source);
2858 spin_lock_bh(&mppath->state_lock);
2859 if (!ether_addr_equal(mppath->mpp, eth->h_source)) {
2860 memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
2863 mppath->exp_time = jiffies;
2864 spin_unlock_bh(&mppath->state_lock);
2867 /* flush fast xmit cache if the address path changed */
2869 mesh_fast_tx_flush_addr(sdata, proxied_addr);
2874 /* Frame has reached destination. Don't forward */
2875 if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
2878 if (!--mesh_hdr->ttl) {
2882 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2883 return RX_DROP_MONITOR;
2886 if (!ifmsh->mshcfg.dot11MeshForwarding) {
2887 if (is_multicast_ether_addr(eth->h_dest))
2890 return RX_DROP_MONITOR;
2893 skb_set_queue_mapping(skb, ieee802_1d_to_ac[skb->priority]);
2896 ieee80211_rx_mesh_fast_forward(sdata, skb, mesh_hdrlen))
2899 ieee80211_fill_mesh_addresses(&hdr, &hdr.frame_control,
2900 eth->h_dest, eth->h_source);
2901 hdrlen = ieee80211_hdrlen(hdr.frame_control);
2903 int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);
2905 fwd_skb = skb_copy_expand(skb, local->tx_headroom + extra_head +
2906 IEEE80211_ENCRYPT_HEADROOM,
2907 tailroom, GFP_ATOMIC);
2914 if (skb_cow_head(fwd_skb, hdrlen - sizeof(struct ethhdr)))
2915 return RX_DROP_U_OOM;
2917 if (skb_linearize(fwd_skb))
2918 return RX_DROP_U_OOM;
2921 fwd_hdr = skb_push(fwd_skb, hdrlen - sizeof(struct ethhdr));
2922 memcpy(fwd_hdr, &hdr, hdrlen - 2);
2923 qos = ieee80211_get_qos_ctl(fwd_hdr);
2924 qos[0] = qos[1] = 0;
2926 skb_reset_mac_header(fwd_skb);
2927 hdrlen += mesh_hdrlen;
2928 if (ieee80211_get_8023_tunnel_proto(fwd_skb->data + hdrlen,
2929 &fwd_skb->protocol))
2932 fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
2933 skb_set_network_header(fwd_skb, hdrlen + 2);
2935 info = IEEE80211_SKB_CB(fwd_skb);
2936 memset(info, 0, sizeof(*info));
2937 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2938 info->control.vif = &sdata->vif;
2939 info->control.jiffies = jiffies;
2940 fwd_skb->dev = sdata->dev;
2942 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2943 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2944 /* update power mode indication when forwarding */
2945 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2946 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2947 /* mesh power mode flags updated in mesh_nexthop_lookup */
2948 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2950 /* unable to resolve next hop */
2952 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2954 WLAN_REASON_MESH_PATH_NOFORWARD,
2956 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2961 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2962 ieee80211_add_pending_skb(local, fwd_skb);
2968 ieee80211_strip_8023_mesh_hdr(skb);
2974 static ieee80211_rx_result debug_noinline
2975 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2977 struct net_device *dev = rx->sdata->dev;
2978 struct sk_buff *skb = rx->skb;
2979 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2980 __le16 fc = hdr->frame_control;
2981 struct sk_buff_head frame_list;
2982 ieee80211_rx_result res;
2983 struct ethhdr ethhdr;
2984 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2986 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2989 } else switch (rx->sdata->vif.type) {
2990 case NL80211_IFTYPE_AP:
2991 case NL80211_IFTYPE_AP_VLAN:
2994 case NL80211_IFTYPE_STATION:
2996 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2999 case NL80211_IFTYPE_MESH_POINT:
3008 __skb_queue_head_init(&frame_list);
3010 if (ieee80211_data_to_8023_exthdr(skb, ðhdr,
3011 rx->sdata->vif.addr,
3012 rx->sdata->vif.type,
3014 return RX_DROP_U_BAD_AMSDU;
3016 if (rx->sta->amsdu_mesh_control < 0) {
3020 for (i = 0; i <= 2; i++) {
3021 if (!ieee80211_is_valid_amsdu(skb, i))
3033 rx->sta->amsdu_mesh_control = valid;
3036 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
3037 rx->sdata->vif.type,
3038 rx->local->hw.extra_tx_headroom,
3040 rx->sta->amsdu_mesh_control);
3042 while (!skb_queue_empty(&frame_list)) {
3043 rx->skb = __skb_dequeue(&frame_list);
3045 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3055 if (!ieee80211_frame_allowed(rx, fc))
3058 ieee80211_deliver_skb(rx);
3062 dev_kfree_skb(rx->skb);
3068 static ieee80211_rx_result debug_noinline
3069 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
3071 struct sk_buff *skb = rx->skb;
3072 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3073 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3074 __le16 fc = hdr->frame_control;
3076 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
3079 if (unlikely(!ieee80211_is_data(fc)))
3082 if (unlikely(!ieee80211_is_data_present(fc)))
3083 return RX_DROP_MONITOR;
3085 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3086 switch (rx->sdata->vif.type) {
3087 case NL80211_IFTYPE_AP_VLAN:
3088 if (!rx->sdata->u.vlan.sta)
3089 return RX_DROP_U_BAD_4ADDR;
3091 case NL80211_IFTYPE_STATION:
3092 if (!rx->sdata->u.mgd.use_4addr)
3093 return RX_DROP_U_BAD_4ADDR;
3095 case NL80211_IFTYPE_MESH_POINT:
3098 return RX_DROP_U_BAD_4ADDR;
3102 if (is_multicast_ether_addr(hdr->addr1) || !rx->sta)
3103 return RX_DROP_U_BAD_AMSDU;
3107 * We should not receive A-MSDUs on pre-HT connections,
3108 * and HT connections cannot use old ciphers. Thus drop
3109 * them, as in those cases we couldn't even have SPP
3112 switch (rx->key->conf.cipher) {
3113 case WLAN_CIPHER_SUITE_WEP40:
3114 case WLAN_CIPHER_SUITE_WEP104:
3115 case WLAN_CIPHER_SUITE_TKIP:
3116 return RX_DROP_U_BAD_AMSDU_CIPHER;
3122 return __ieee80211_rx_h_amsdu(rx, 0);
3125 static ieee80211_rx_result debug_noinline
3126 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
3128 struct ieee80211_sub_if_data *sdata = rx->sdata;
3129 struct ieee80211_local *local = rx->local;
3130 struct net_device *dev = sdata->dev;
3131 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3132 __le16 fc = hdr->frame_control;
3133 ieee80211_rx_result res;
3136 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3139 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3140 return RX_DROP_MONITOR;
3143 * Send unexpected-4addr-frame event to hostapd. For older versions,
3144 * also drop the frame to cooked monitor interfaces.
3146 if (ieee80211_has_a4(hdr->frame_control) &&
3147 sdata->vif.type == NL80211_IFTYPE_AP) {
3149 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
3150 cfg80211_rx_unexpected_4addr_frame(
3151 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
3152 return RX_DROP_MONITOR;
3155 res = __ieee80211_data_to_8023(rx, &port_control);
3156 if (unlikely(res != RX_CONTINUE))
3159 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
3160 if (res != RX_CONTINUE)
3163 if (!ieee80211_frame_allowed(rx, fc))
3164 return RX_DROP_MONITOR;
3166 /* directly handle TDLS channel switch requests/responses */
3167 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3168 cpu_to_be16(ETH_P_TDLS))) {
3169 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3171 if (pskb_may_pull(rx->skb,
3172 offsetof(struct ieee80211_tdls_data, u)) &&
3173 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3174 tf->category == WLAN_CATEGORY_TDLS &&
3175 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3176 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3177 rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3178 __ieee80211_queue_skb_to_iface(sdata, rx->link_id,
3184 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3185 unlikely(port_control) && sdata->bss) {
3186 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3194 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3195 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3196 !is_multicast_ether_addr(
3197 ((struct ethhdr *)rx->skb->data)->h_dest) &&
3198 (!local->scanning &&
3199 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3200 mod_timer(&local->dynamic_ps_timer, jiffies +
3201 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
3203 ieee80211_deliver_skb(rx);
3208 static ieee80211_rx_result debug_noinline
3209 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3211 struct sk_buff *skb = rx->skb;
3212 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3213 struct tid_ampdu_rx *tid_agg_rx;
3217 if (likely(!ieee80211_is_ctl(bar->frame_control)))
3220 if (ieee80211_is_back_req(bar->frame_control)) {
3222 __le16 control, start_seq_num;
3223 } __packed bar_data;
3224 struct ieee80211_event event = {
3225 .type = BAR_RX_EVENT,
3229 return RX_DROP_MONITOR;
3231 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3232 &bar_data, sizeof(bar_data)))
3233 return RX_DROP_MONITOR;
3235 tid = le16_to_cpu(bar_data.control) >> 12;
3237 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3238 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
3239 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
3240 WLAN_BACK_RECIPIENT,
3241 WLAN_REASON_QSTA_REQUIRE_SETUP);
3243 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3245 return RX_DROP_MONITOR;
3247 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3248 event.u.ba.tid = tid;
3249 event.u.ba.ssn = start_seq_num;
3250 event.u.ba.sta = &rx->sta->sta;
3252 /* reset session timer */
3253 if (tid_agg_rx->timeout)
3254 mod_timer(&tid_agg_rx->session_timer,
3255 TU_TO_EXP_TIME(tid_agg_rx->timeout));
3257 spin_lock(&tid_agg_rx->reorder_lock);
3258 /* release stored frames up to start of BAR */
3259 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
3260 start_seq_num, frames);
3261 spin_unlock(&tid_agg_rx->reorder_lock);
3263 drv_event_callback(rx->local, rx->sdata, &event);
3270 * After this point, we only want management frames,
3271 * so we can drop all remaining control frames to
3272 * cooked monitor interfaces.
3274 return RX_DROP_MONITOR;
3277 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3278 struct ieee80211_mgmt *mgmt,
3281 struct ieee80211_local *local = sdata->local;
3282 struct sk_buff *skb;
3283 struct ieee80211_mgmt *resp;
3285 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
3286 /* Not to own unicast address */
3290 if (!ether_addr_equal(mgmt->sa, sdata->deflink.u.mgd.bssid) ||
3291 !ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid)) {
3292 /* Not from the current AP or not associated yet. */
3296 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3297 /* Too short SA Query request frame */
3301 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
3305 skb_reserve(skb, local->hw.extra_tx_headroom);
3306 resp = skb_put_zero(skb, 24);
3307 memcpy(resp->da, mgmt->sa, ETH_ALEN);
3308 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3309 memcpy(resp->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3310 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3311 IEEE80211_STYPE_ACTION);
3312 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
3313 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3314 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3315 memcpy(resp->u.action.u.sa_query.trans_id,
3316 mgmt->u.action.u.sa_query.trans_id,
3317 WLAN_SA_QUERY_TR_ID_LEN);
3319 ieee80211_tx_skb(sdata, skb);
3323 ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3325 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3326 const struct element *ie;
3329 if (!wiphy_ext_feature_isset(rx->local->hw.wiphy,
3330 NL80211_EXT_FEATURE_BSS_COLOR))
3333 if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3336 if (rx->sdata->vif.bss_conf.csa_active)
3339 baselen = mgmt->u.beacon.variable - rx->skb->data;
3340 if (baselen > rx->skb->len)
3343 ie = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION,
3344 mgmt->u.beacon.variable,
3345 rx->skb->len - baselen);
3346 if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3347 ie->datalen >= ieee80211_he_oper_size(ie->data + 1)) {
3348 struct ieee80211_bss_conf *bss_conf = &rx->sdata->vif.bss_conf;
3349 const struct ieee80211_he_operation *he_oper;
3352 he_oper = (void *)(ie->data + 1);
3353 if (le32_get_bits(he_oper->he_oper_params,
3354 IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3357 color = le32_get_bits(he_oper->he_oper_params,
3358 IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3359 if (color == bss_conf->he_bss_color.color)
3360 ieee80211_obss_color_collision_notify(&rx->sdata->vif,
3366 static ieee80211_rx_result debug_noinline
3367 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3369 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3370 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3372 if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3376 * From here on, look only at management frames.
3377 * Data and control frames are already handled,
3378 * and unknown (reserved) frames are useless.
3380 if (rx->skb->len < 24)
3381 return RX_DROP_MONITOR;
3383 if (!ieee80211_is_mgmt(mgmt->frame_control))
3384 return RX_DROP_MONITOR;
3386 /* drop too small action frames */
3387 if (ieee80211_is_action(mgmt->frame_control) &&
3388 rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
3389 return RX_DROP_U_RUNT_ACTION;
3391 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3392 ieee80211_is_beacon(mgmt->frame_control) &&
3393 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3396 /* sw bss color collision detection */
3397 ieee80211_rx_check_bss_color_collision(rx);
3399 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3400 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3401 sig = status->signal;
3403 cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy,
3404 rx->skb->data, rx->skb->len,
3405 ieee80211_rx_status_to_khz(status),
3407 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3410 return ieee80211_drop_unencrypted_mgmt(rx);
3414 ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3416 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3417 struct ieee80211_sub_if_data *sdata = rx->sdata;
3419 /* TWT actions are only supported in AP for the moment */
3420 if (sdata->vif.type != NL80211_IFTYPE_AP)
3423 if (!rx->local->ops->add_twt_setup)
3426 if (!sdata->vif.bss_conf.twt_responder)
3432 switch (mgmt->u.action.u.s1g.action_code) {
3433 case WLAN_S1G_TWT_SETUP: {
3434 struct ieee80211_twt_setup *twt;
3436 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3437 1 + /* action code */
3438 sizeof(struct ieee80211_twt_setup) +
3439 2 /* TWT req_type agrt */)
3442 twt = (void *)mgmt->u.action.u.s1g.variable;
3443 if (twt->element_id != WLAN_EID_S1G_TWT)
3446 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3447 4 + /* action code + token + tlv */
3451 return true; /* queue the frame */
3453 case WLAN_S1G_TWT_TEARDOWN:
3454 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3457 return true; /* queue the frame */
3465 static ieee80211_rx_result debug_noinline
3466 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3468 struct ieee80211_local *local = rx->local;
3469 struct ieee80211_sub_if_data *sdata = rx->sdata;
3470 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3471 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3472 int len = rx->skb->len;
3474 if (!ieee80211_is_action(mgmt->frame_control))
3477 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3478 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3479 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3480 return RX_DROP_U_ACTION_UNKNOWN_SRC;
3482 switch (mgmt->u.action.category) {
3483 case WLAN_CATEGORY_HT:
3484 /* reject HT action frames from stations not supporting HT */
3485 if (!rx->link_sta->pub->ht_cap.ht_supported)
3488 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3489 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3490 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3491 sdata->vif.type != NL80211_IFTYPE_AP &&
3492 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3495 /* verify action & smps_control/chanwidth are present */
3496 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3499 switch (mgmt->u.action.u.ht_smps.action) {
3500 case WLAN_HT_ACTION_SMPS: {
3501 struct ieee80211_supported_band *sband;
3502 enum ieee80211_smps_mode smps_mode;
3503 struct sta_opmode_info sta_opmode = {};
3505 if (sdata->vif.type != NL80211_IFTYPE_AP &&
3506 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3509 /* convert to HT capability */
3510 switch (mgmt->u.action.u.ht_smps.smps_control) {
3511 case WLAN_HT_SMPS_CONTROL_DISABLED:
3512 smps_mode = IEEE80211_SMPS_OFF;
3514 case WLAN_HT_SMPS_CONTROL_STATIC:
3515 smps_mode = IEEE80211_SMPS_STATIC;
3517 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3518 smps_mode = IEEE80211_SMPS_DYNAMIC;
3524 /* if no change do nothing */
3525 if (rx->link_sta->pub->smps_mode == smps_mode)
3527 rx->link_sta->pub->smps_mode = smps_mode;
3528 sta_opmode.smps_mode =
3529 ieee80211_smps_mode_to_smps_mode(smps_mode);
3530 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3532 sband = rx->local->hw.wiphy->bands[status->band];
3534 rate_control_rate_update(local, sband, rx->sta, 0,
3535 IEEE80211_RC_SMPS_CHANGED);
3536 cfg80211_sta_opmode_change_notify(sdata->dev,
3542 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3543 struct ieee80211_supported_band *sband;
3544 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3545 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3546 struct sta_opmode_info sta_opmode = {};
3548 /* If it doesn't support 40 MHz it can't change ... */
3549 if (!(rx->link_sta->pub->ht_cap.cap &
3550 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3553 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3554 max_bw = IEEE80211_STA_RX_BW_20;
3556 max_bw = ieee80211_sta_cap_rx_bw(rx->link_sta);
3558 /* set cur_max_bandwidth and recalc sta bw */
3559 rx->link_sta->cur_max_bandwidth = max_bw;
3560 new_bw = ieee80211_sta_cur_vht_bw(rx->link_sta);
3562 if (rx->link_sta->pub->bandwidth == new_bw)
3565 rx->link_sta->pub->bandwidth = new_bw;
3566 sband = rx->local->hw.wiphy->bands[status->band];
3568 ieee80211_sta_rx_bw_to_chan_width(rx->link_sta);
3569 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3571 rate_control_rate_update(local, sband, rx->sta, 0,
3572 IEEE80211_RC_BW_CHANGED);
3573 cfg80211_sta_opmode_change_notify(sdata->dev,
3584 case WLAN_CATEGORY_PUBLIC:
3585 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3587 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3591 if (!ether_addr_equal(mgmt->bssid, sdata->deflink.u.mgd.bssid))
3593 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3594 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3596 if (len < offsetof(struct ieee80211_mgmt,
3597 u.action.u.ext_chan_switch.variable))
3600 case WLAN_CATEGORY_VHT:
3601 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3602 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3603 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3604 sdata->vif.type != NL80211_IFTYPE_AP &&
3605 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3608 /* verify action code is present */
3609 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3612 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3613 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3614 /* verify opmode is present */
3615 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3619 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3620 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3628 case WLAN_CATEGORY_BACK:
3629 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3630 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3631 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3632 sdata->vif.type != NL80211_IFTYPE_AP &&
3633 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3636 /* verify action_code is present */
3637 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3640 switch (mgmt->u.action.u.addba_req.action_code) {
3641 case WLAN_ACTION_ADDBA_REQ:
3642 if (len < (IEEE80211_MIN_ACTION_SIZE +
3643 sizeof(mgmt->u.action.u.addba_req)))
3646 case WLAN_ACTION_ADDBA_RESP:
3647 if (len < (IEEE80211_MIN_ACTION_SIZE +
3648 sizeof(mgmt->u.action.u.addba_resp)))
3651 case WLAN_ACTION_DELBA:
3652 if (len < (IEEE80211_MIN_ACTION_SIZE +
3653 sizeof(mgmt->u.action.u.delba)))
3661 case WLAN_CATEGORY_SPECTRUM_MGMT:
3662 /* verify action_code is present */
3663 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3666 switch (mgmt->u.action.u.measurement.action_code) {
3667 case WLAN_ACTION_SPCT_MSR_REQ:
3668 if (status->band != NL80211_BAND_5GHZ)
3671 if (len < (IEEE80211_MIN_ACTION_SIZE +
3672 sizeof(mgmt->u.action.u.measurement)))
3675 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3678 ieee80211_process_measurement_req(sdata, mgmt, len);
3680 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3682 if (len < (IEEE80211_MIN_ACTION_SIZE +
3683 sizeof(mgmt->u.action.u.chan_switch)))
3686 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3687 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3688 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3691 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3692 bssid = sdata->deflink.u.mgd.bssid;
3693 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3694 bssid = sdata->u.ibss.bssid;
3695 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3700 if (!ether_addr_equal(mgmt->bssid, bssid))
3707 case WLAN_CATEGORY_SELF_PROTECTED:
3708 if (len < (IEEE80211_MIN_ACTION_SIZE +
3709 sizeof(mgmt->u.action.u.self_prot.action_code)))
3712 switch (mgmt->u.action.u.self_prot.action_code) {
3713 case WLAN_SP_MESH_PEERING_OPEN:
3714 case WLAN_SP_MESH_PEERING_CLOSE:
3715 case WLAN_SP_MESH_PEERING_CONFIRM:
3716 if (!ieee80211_vif_is_mesh(&sdata->vif))
3718 if (sdata->u.mesh.user_mpm)
3719 /* userspace handles this frame */
3722 case WLAN_SP_MGK_INFORM:
3723 case WLAN_SP_MGK_ACK:
3724 if (!ieee80211_vif_is_mesh(&sdata->vif))
3729 case WLAN_CATEGORY_MESH_ACTION:
3730 if (len < (IEEE80211_MIN_ACTION_SIZE +
3731 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3734 if (!ieee80211_vif_is_mesh(&sdata->vif))
3736 if (mesh_action_is_path_sel(mgmt) &&
3737 !mesh_path_sel_is_hwmp(sdata))
3740 case WLAN_CATEGORY_S1G:
3741 if (len < offsetofend(typeof(*mgmt),
3742 u.action.u.s1g.action_code))
3745 switch (mgmt->u.action.u.s1g.action_code) {
3746 case WLAN_S1G_TWT_SETUP:
3747 case WLAN_S1G_TWT_TEARDOWN:
3748 if (ieee80211_process_rx_twt_action(rx))
3760 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3761 /* will return in the next handlers */
3766 rx->link_sta->rx_stats.packets++;
3767 dev_kfree_skb(rx->skb);
3771 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3775 static ieee80211_rx_result debug_noinline
3776 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3778 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3779 struct cfg80211_rx_info info = {
3780 .freq = ieee80211_rx_status_to_khz(status),
3781 .buf = rx->skb->data,
3782 .len = rx->skb->len,
3783 .link_id = rx->link_id,
3784 .have_link_id = rx->link_id >= 0,
3787 /* skip known-bad action frames and return them in the next handler */
3788 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3792 * Getting here means the kernel doesn't know how to handle
3793 * it, but maybe userspace does ... include returned frames
3794 * so userspace can register for those to know whether ones
3795 * it transmitted were processed or returned.
3798 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3799 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3800 info.sig_dbm = status->signal;
3802 if (ieee80211_is_timing_measurement(rx->skb) ||
3803 ieee80211_is_ftm(rx->skb)) {
3804 info.rx_tstamp = ktime_to_ns(skb_hwtstamps(rx->skb)->hwtstamp);
3805 info.ack_tstamp = ktime_to_ns(status->ack_tx_hwtstamp);
3808 if (cfg80211_rx_mgmt_ext(&rx->sdata->wdev, &info)) {
3810 rx->link_sta->rx_stats.packets++;
3811 dev_kfree_skb(rx->skb);
3818 static ieee80211_rx_result debug_noinline
3819 ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3821 struct ieee80211_sub_if_data *sdata = rx->sdata;
3822 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3823 int len = rx->skb->len;
3825 if (!ieee80211_is_action(mgmt->frame_control))
3828 switch (mgmt->u.action.category) {
3829 case WLAN_CATEGORY_SA_QUERY:
3830 if (len < (IEEE80211_MIN_ACTION_SIZE +
3831 sizeof(mgmt->u.action.u.sa_query)))
3834 switch (mgmt->u.action.u.sa_query.action) {
3835 case WLAN_ACTION_SA_QUERY_REQUEST:
3836 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3838 ieee80211_process_sa_query_req(sdata, mgmt, len);
3848 rx->link_sta->rx_stats.packets++;
3849 dev_kfree_skb(rx->skb);
3853 static ieee80211_rx_result debug_noinline
3854 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3856 struct ieee80211_local *local = rx->local;
3857 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3858 struct sk_buff *nskb;
3859 struct ieee80211_sub_if_data *sdata = rx->sdata;
3860 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3862 if (!ieee80211_is_action(mgmt->frame_control))
3866 * For AP mode, hostapd is responsible for handling any action
3867 * frames that we didn't handle, including returning unknown
3868 * ones. For all other modes we will return them to the sender,
3869 * setting the 0x80 bit in the action category, as required by
3870 * 802.11-2012 9.24.4.
3871 * Newer versions of hostapd shall also use the management frame
3872 * registration mechanisms, but older ones still use cooked
3873 * monitor interfaces so push all frames there.
3875 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3876 (sdata->vif.type == NL80211_IFTYPE_AP ||
3877 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3878 return RX_DROP_MONITOR;
3880 if (is_multicast_ether_addr(mgmt->da))
3881 return RX_DROP_MONITOR;
3883 /* do not return rejected action frames */
3884 if (mgmt->u.action.category & 0x80)
3885 return RX_DROP_U_REJECTED_ACTION_RESPONSE;
3887 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3890 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3892 nmgmt->u.action.category |= 0x80;
3893 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3894 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3896 memset(nskb->cb, 0, sizeof(nskb->cb));
3898 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3899 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3901 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3902 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3903 IEEE80211_TX_CTL_NO_CCK_RATE;
3904 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3906 local->hw.offchannel_tx_hw_queue;
3909 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, -1,
3912 dev_kfree_skb(rx->skb);
3916 static ieee80211_rx_result debug_noinline
3917 ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
3919 struct ieee80211_sub_if_data *sdata = rx->sdata;
3920 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
3922 if (!ieee80211_is_ext(hdr->frame_control))
3925 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3926 return RX_DROP_MONITOR;
3928 /* for now only beacons are ext, so queue them */
3929 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3934 static ieee80211_rx_result debug_noinline
3935 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3937 struct ieee80211_sub_if_data *sdata = rx->sdata;
3938 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3941 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3943 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3944 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3945 sdata->vif.type != NL80211_IFTYPE_OCB &&
3946 sdata->vif.type != NL80211_IFTYPE_STATION)
3947 return RX_DROP_MONITOR;
3950 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3951 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3952 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3953 /* process for all: mesh, mlme, ibss */
3955 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3956 if (is_multicast_ether_addr(mgmt->da) &&
3957 !is_broadcast_ether_addr(mgmt->da))
3958 return RX_DROP_MONITOR;
3960 /* process only for station/IBSS */
3961 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3962 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3963 return RX_DROP_MONITOR;
3965 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3966 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3967 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3968 if (is_multicast_ether_addr(mgmt->da) &&
3969 !is_broadcast_ether_addr(mgmt->da))
3970 return RX_DROP_MONITOR;
3972 /* process only for station */
3973 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3974 return RX_DROP_MONITOR;
3976 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3977 /* process only for ibss and mesh */
3978 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3979 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3980 return RX_DROP_MONITOR;
3983 return RX_DROP_MONITOR;
3986 ieee80211_queue_skb_to_iface(sdata, rx->link_id, rx->sta, rx->skb);
3991 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3992 struct ieee80211_rate *rate,
3993 ieee80211_rx_result reason)
3995 struct ieee80211_sub_if_data *sdata;
3996 struct ieee80211_local *local = rx->local;
3997 struct sk_buff *skb = rx->skb, *skb2;
3998 struct net_device *prev_dev = NULL;
3999 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4000 int needed_headroom;
4003 * If cooked monitor has been processed already, then
4004 * don't do it again. If not, set the flag.
4006 if (rx->flags & IEEE80211_RX_CMNTR)
4008 rx->flags |= IEEE80211_RX_CMNTR;
4010 /* If there are no cooked monitor interfaces, just free the SKB */
4011 if (!local->cooked_mntrs)
4014 /* room for the radiotap header based on driver features */
4015 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
4017 if (skb_headroom(skb) < needed_headroom &&
4018 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
4021 /* prepend radiotap information */
4022 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
4025 skb_reset_mac_header(skb);
4026 skb->ip_summed = CHECKSUM_UNNECESSARY;
4027 skb->pkt_type = PACKET_OTHERHOST;
4028 skb->protocol = htons(ETH_P_802_2);
4030 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4031 if (!ieee80211_sdata_running(sdata))
4034 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
4035 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
4039 skb2 = skb_clone(skb, GFP_ATOMIC);
4041 skb2->dev = prev_dev;
4042 netif_receive_skb(skb2);
4046 prev_dev = sdata->dev;
4047 dev_sw_netstats_rx_add(sdata->dev, skb->len);
4051 skb->dev = prev_dev;
4052 netif_receive_skb(skb);
4057 kfree_skb_reason(skb, (__force u32)reason);
4060 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
4061 ieee80211_rx_result res)
4063 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4064 struct ieee80211_supported_band *sband;
4065 struct ieee80211_rate *rate = NULL;
4067 if (res == RX_QUEUED) {
4068 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
4072 if (res != RX_CONTINUE) {
4073 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
4075 rx->link_sta->rx_stats.dropped++;
4078 if (u32_get_bits((__force u32)res, SKB_DROP_REASON_SUBSYS_MASK) ==
4079 SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE) {
4080 kfree_skb_reason(rx->skb, (__force u32)res);
4084 sband = rx->local->hw.wiphy->bands[status->band];
4085 if (status->encoding == RX_ENC_LEGACY)
4086 rate = &sband->bitrates[status->rate_idx];
4088 ieee80211_rx_cooked_monitor(rx, rate, res);
4091 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
4092 struct sk_buff_head *frames)
4094 ieee80211_rx_result res = RX_DROP_MONITOR;
4095 struct sk_buff *skb;
4097 #define CALL_RXH(rxh) \
4100 if (res != RX_CONTINUE) \
4104 /* Lock here to avoid hitting all of the data used in the RX
4105 * path (e.g. key data, station data, ...) concurrently when
4106 * a frame is released from the reorder buffer due to timeout
4107 * from the timer, potentially concurrently with RX from the
4110 spin_lock_bh(&rx->local->rx_path_lock);
4112 while ((skb = __skb_dequeue(frames))) {
4114 * all the other fields are valid across frames
4115 * that belong to an aMPDU since they are on the
4116 * same TID from the same station
4120 if (WARN_ON_ONCE(!rx->link))
4123 CALL_RXH(ieee80211_rx_h_check_more_data);
4124 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
4125 CALL_RXH(ieee80211_rx_h_sta_process);
4126 CALL_RXH(ieee80211_rx_h_decrypt);
4127 CALL_RXH(ieee80211_rx_h_defragment);
4128 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
4129 /* must be after MMIC verify so header is counted in MPDU mic */
4130 CALL_RXH(ieee80211_rx_h_amsdu);
4131 CALL_RXH(ieee80211_rx_h_data);
4133 /* special treatment -- needs the queue */
4134 res = ieee80211_rx_h_ctrl(rx, frames);
4135 if (res != RX_CONTINUE)
4138 CALL_RXH(ieee80211_rx_h_mgmt_check);
4139 CALL_RXH(ieee80211_rx_h_action);
4140 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4141 CALL_RXH(ieee80211_rx_h_action_post_userspace);
4142 CALL_RXH(ieee80211_rx_h_action_return);
4143 CALL_RXH(ieee80211_rx_h_ext);
4144 CALL_RXH(ieee80211_rx_h_mgmt);
4147 ieee80211_rx_handlers_result(rx, res);
4152 spin_unlock_bh(&rx->local->rx_path_lock);
4155 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4157 struct sk_buff_head reorder_release;
4158 ieee80211_rx_result res = RX_DROP_MONITOR;
4160 __skb_queue_head_init(&reorder_release);
4162 #define CALL_RXH(rxh) \
4165 if (res != RX_CONTINUE) \
4169 CALL_RXH(ieee80211_rx_h_check_dup);
4170 CALL_RXH(ieee80211_rx_h_check);
4172 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
4174 ieee80211_rx_handlers(rx, &reorder_release);
4178 ieee80211_rx_handlers_result(rx, res);
4184 ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4186 return !!(sta->valid_links & BIT(link_id));
4189 static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
4192 rx->link_id = link_id;
4193 rx->link = rcu_dereference(rx->sdata->link[link_id]);
4198 if (!ieee80211_rx_is_valid_sta_link_id(&rx->sta->sta, link_id))
4201 rx->link_sta = rcu_dereference(rx->sta->link[link_id]);
4203 return rx->link && rx->link_sta;
4206 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
4207 struct sta_info *sta, int link_id)
4209 rx->link_id = link_id;
4213 rx->local = sta->sdata->local;
4215 rx->sdata = sta->sdata;
4216 rx->link_sta = &sta->deflink;
4218 rx->link_sta = NULL;
4222 rx->link = &rx->sdata->deflink;
4223 else if (!ieee80211_rx_data_set_link(rx, link_id))
4230 * This function makes calls into the RX path, therefore
4231 * it has to be invoked under RCU read lock.
4233 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4235 struct sk_buff_head frames;
4236 struct ieee80211_rx_data rx = {
4237 /* This is OK -- must be QoS data frame */
4238 .security_idx = tid,
4241 struct tid_ampdu_rx *tid_agg_rx;
4244 /* FIXME: statistics won't be right with this */
4245 if (sta->sta.valid_links)
4246 link_id = ffs(sta->sta.valid_links) - 1;
4248 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
4251 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4255 __skb_queue_head_init(&frames);
4257 spin_lock(&tid_agg_rx->reorder_lock);
4258 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4259 spin_unlock(&tid_agg_rx->reorder_lock);
4261 if (!skb_queue_empty(&frames)) {
4262 struct ieee80211_event event = {
4263 .type = BA_FRAME_TIMEOUT,
4265 .u.ba.sta = &sta->sta,
4267 drv_event_callback(rx.local, rx.sdata, &event);
4270 ieee80211_rx_handlers(&rx, &frames);
4273 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4274 u16 ssn, u64 filtered,
4277 struct ieee80211_local *local;
4278 struct sta_info *sta;
4279 struct tid_ampdu_rx *tid_agg_rx;
4280 struct sk_buff_head frames;
4281 struct ieee80211_rx_data rx = {
4282 /* This is OK -- must be QoS data frame */
4283 .security_idx = tid,
4288 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4291 __skb_queue_head_init(&frames);
4293 sta = container_of(pubsta, struct sta_info, sta);
4295 local = sta->sdata->local;
4296 WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64,
4297 "RX BA marker can't support max_rx_aggregation_subframes %u > 64\n",
4298 local->hw.max_rx_aggregation_subframes);
4300 if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
4304 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4308 spin_lock_bh(&tid_agg_rx->reorder_lock);
4310 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4313 /* release all frames in the reorder buffer */
4314 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4315 IEEE80211_SN_MODULO;
4316 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
4318 /* update ssn to match received ssn */
4319 tid_agg_rx->head_seq_num = ssn;
4321 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
4325 /* handle the case that received ssn is behind the mac ssn.
4326 * it can be tid_agg_rx->buf_size behind and still be valid */
4327 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4328 if (diff >= tid_agg_rx->buf_size) {
4329 tid_agg_rx->reorder_buf_filtered = 0;
4332 filtered = filtered >> diff;
4336 for (i = 0; i < tid_agg_rx->buf_size; i++) {
4337 int index = (ssn + i) % tid_agg_rx->buf_size;
4339 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4340 if (filtered & BIT_ULL(i))
4341 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4344 /* now process also frames that the filter marking released */
4345 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
4348 spin_unlock_bh(&tid_agg_rx->reorder_lock);
4350 ieee80211_rx_handlers(&rx, &frames);
4355 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4357 /* main receive path */
4359 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4361 return ether_addr_equal(raddr, addr) ||
4362 is_broadcast_ether_addr(raddr);
4365 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4367 struct ieee80211_sub_if_data *sdata = rx->sdata;
4368 struct sk_buff *skb = rx->skb;
4369 struct ieee80211_hdr *hdr = (void *)skb->data;
4370 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4371 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
4372 bool multicast = is_multicast_ether_addr(hdr->addr1) ||
4373 ieee80211_is_s1g_beacon(hdr->frame_control);
4375 switch (sdata->vif.type) {
4376 case NL80211_IFTYPE_STATION:
4377 if (!bssid && !sdata->u.mgd.use_4addr)
4379 if (ieee80211_is_first_frag(hdr->seq_ctrl) &&
4380 ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4384 return ieee80211_is_our_addr(sdata, hdr->addr1, &rx->link_id);
4385 case NL80211_IFTYPE_ADHOC:
4388 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
4389 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) ||
4390 !is_valid_ether_addr(hdr->addr2))
4392 if (ieee80211_is_beacon(hdr->frame_control))
4394 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
4397 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
4401 if (status->encoding != RX_ENC_LEGACY)
4402 rate_idx = 0; /* TODO: HT/VHT rates */
4404 rate_idx = status->rate_idx;
4405 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
4409 case NL80211_IFTYPE_OCB:
4412 if (!ieee80211_is_data_present(hdr->frame_control))
4414 if (!is_broadcast_ether_addr(bssid))
4417 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
4421 if (status->encoding != RX_ENC_LEGACY)
4422 rate_idx = 0; /* TODO: HT rates */
4424 rate_idx = status->rate_idx;
4425 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
4429 case NL80211_IFTYPE_MESH_POINT:
4430 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
4434 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
4435 case NL80211_IFTYPE_AP_VLAN:
4436 case NL80211_IFTYPE_AP:
4438 return ieee80211_is_our_addr(sdata, hdr->addr1,
4441 if (!is_broadcast_ether_addr(bssid) &&
4442 !ieee80211_is_our_addr(sdata, bssid, NULL)) {
4444 * Accept public action frames even when the
4445 * BSSID doesn't match, this is used for P2P
4446 * and location updates. Note that mac80211
4447 * itself never looks at these frames.
4450 !ieee80211_is_our_addr(sdata, hdr->addr1,
4453 if (ieee80211_is_public_action(hdr, skb->len))
4455 return ieee80211_is_beacon(hdr->frame_control);
4458 if (!ieee80211_has_tods(hdr->frame_control)) {
4459 /* ignore data frames to TDLS-peers */
4460 if (ieee80211_is_data(hdr->frame_control))
4462 /* ignore action frames to TDLS-peers */
4463 if (ieee80211_is_action(hdr->frame_control) &&
4464 !is_broadcast_ether_addr(bssid) &&
4465 !ether_addr_equal(bssid, hdr->addr1))
4470 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
4471 * the BSSID - we've checked that already but may have accepted
4472 * the wildcard (ff:ff:ff:ff:ff:ff).
4475 * The BSSID of the Data frame is determined as follows:
4476 * a) If the STA is contained within an AP or is associated
4477 * with an AP, the BSSID is the address currently in use
4478 * by the STA contained in the AP.
4480 * So we should not accept data frames with an address that's
4483 * Accepting it also opens a security problem because stations
4484 * could encrypt it with the GTK and inject traffic that way.
4486 if (ieee80211_is_data(hdr->frame_control) && multicast)
4490 case NL80211_IFTYPE_P2P_DEVICE:
4491 return ieee80211_is_public_action(hdr, skb->len) ||
4492 ieee80211_is_probe_req(hdr->frame_control) ||
4493 ieee80211_is_probe_resp(hdr->frame_control) ||
4494 ieee80211_is_beacon(hdr->frame_control);
4495 case NL80211_IFTYPE_NAN:
4496 /* Currently no frames on NAN interface are allowed */
4506 void ieee80211_check_fast_rx(struct sta_info *sta)
4508 struct ieee80211_sub_if_data *sdata = sta->sdata;
4509 struct ieee80211_local *local = sdata->local;
4510 struct ieee80211_key *key;
4511 struct ieee80211_fast_rx fastrx = {
4513 .vif_type = sdata->vif.type,
4514 .control_port_protocol = sdata->control_port_protocol,
4515 }, *old, *new = NULL;
4517 bool set_offload = false;
4518 bool assign = false;
4521 /* use sparse to check that we don't return without updating */
4522 __acquire(check_fast_rx);
4524 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4525 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4526 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
4527 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
4529 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4531 /* fast-rx doesn't do reordering */
4532 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4533 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4536 switch (sdata->vif.type) {
4537 case NL80211_IFTYPE_STATION:
4538 if (sta->sta.tdls) {
4539 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4540 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4541 fastrx.expected_ds_bits = 0;
4543 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4544 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4545 fastrx.expected_ds_bits =
4546 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4549 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4550 fastrx.expected_ds_bits |=
4551 cpu_to_le16(IEEE80211_FCTL_TODS);
4552 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4553 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4556 if (!sdata->u.mgd.powersave)
4559 /* software powersave is a huge mess, avoid all of it */
4560 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4562 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4563 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4566 case NL80211_IFTYPE_AP_VLAN:
4567 case NL80211_IFTYPE_AP:
4568 /* parallel-rx requires this, at least with calls to
4569 * ieee80211_sta_ps_transition()
4571 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4573 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4574 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4575 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4577 fastrx.internal_forward =
4578 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4579 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4580 !sdata->u.vlan.sta);
4582 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4583 sdata->u.vlan.sta) {
4584 fastrx.expected_ds_bits |=
4585 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4586 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4587 fastrx.internal_forward = 0;
4591 case NL80211_IFTYPE_MESH_POINT:
4592 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
4593 IEEE80211_FCTL_TODS);
4594 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4595 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4601 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4605 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4607 key = rcu_dereference(sdata->default_unicast_key);
4609 switch (key->conf.cipher) {
4610 case WLAN_CIPHER_SUITE_TKIP:
4611 /* we don't want to deal with MMIC in fast-rx */
4613 case WLAN_CIPHER_SUITE_CCMP:
4614 case WLAN_CIPHER_SUITE_CCMP_256:
4615 case WLAN_CIPHER_SUITE_GCMP:
4616 case WLAN_CIPHER_SUITE_GCMP_256:
4619 /* We also don't want to deal with
4620 * WEP or cipher scheme.
4626 fastrx.icv_len = key->conf.icv_len;
4633 __release(check_fast_rx);
4636 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4638 offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4639 offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4641 if (assign && offload)
4642 set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4644 set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD);
4647 drv_sta_set_decap_offload(local, sdata, &sta->sta, assign);
4649 spin_lock_bh(&sta->lock);
4650 old = rcu_dereference_protected(sta->fast_rx, true);
4651 rcu_assign_pointer(sta->fast_rx, new);
4652 spin_unlock_bh(&sta->lock);
4655 kfree_rcu(old, rcu_head);
4658 void ieee80211_clear_fast_rx(struct sta_info *sta)
4660 struct ieee80211_fast_rx *old;
4662 spin_lock_bh(&sta->lock);
4663 old = rcu_dereference_protected(sta->fast_rx, true);
4664 RCU_INIT_POINTER(sta->fast_rx, NULL);
4665 spin_unlock_bh(&sta->lock);
4668 kfree_rcu(old, rcu_head);
4671 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4673 struct ieee80211_local *local = sdata->local;
4674 struct sta_info *sta;
4676 lockdep_assert_wiphy(local->hw.wiphy);
4678 list_for_each_entry(sta, &local->sta_list, list) {
4679 if (sdata != sta->sdata &&
4680 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4682 ieee80211_check_fast_rx(sta);
4686 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4688 struct ieee80211_local *local = sdata->local;
4690 lockdep_assert_wiphy(local->hw.wiphy);
4692 __ieee80211_check_fast_rx_iface(sdata);
4695 static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4696 struct ieee80211_fast_rx *fast_rx,
4699 struct ieee80211_sta_rx_stats *stats;
4700 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
4701 struct sta_info *sta = rx->sta;
4702 struct link_sta_info *link_sta;
4703 struct sk_buff *skb = rx->skb;
4704 void *sa = skb->data + ETH_ALEN;
4705 void *da = skb->data;
4707 if (rx->link_id >= 0) {
4708 link_sta = rcu_dereference(sta->link[rx->link_id]);
4709 if (WARN_ON_ONCE(!link_sta)) {
4710 dev_kfree_skb(rx->skb);
4714 link_sta = &sta->deflink;
4717 stats = &link_sta->rx_stats;
4718 if (fast_rx->uses_rss)
4719 stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4721 /* statistics part of ieee80211_rx_h_sta_process() */
4722 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4723 stats->last_signal = status->signal;
4724 if (!fast_rx->uses_rss)
4725 ewma_signal_add(&link_sta->rx_stats_avg.signal,
4729 if (status->chains) {
4732 stats->chains = status->chains;
4733 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4734 int signal = status->chain_signal[i];
4736 if (!(status->chains & BIT(i)))
4739 stats->chain_signal_last[i] = signal;
4740 if (!fast_rx->uses_rss)
4741 ewma_signal_add(&link_sta->rx_stats_avg.chain_signal[i],
4745 /* end of statistics */
4747 stats->last_rx = jiffies;
4748 stats->last_rate = sta_stats_encode_rate(status);
4753 skb->dev = fast_rx->dev;
4755 dev_sw_netstats_rx_add(fast_rx->dev, skb->len);
4757 /* The seqno index has the same property as needed
4758 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4759 * for non-QoS-data frames. Here we know it's a data
4760 * frame, so count MSDUs.
4762 u64_stats_update_begin(&stats->syncp);
4763 stats->msdu[rx->seqno_idx]++;
4764 stats->bytes += orig_len;
4765 u64_stats_update_end(&stats->syncp);
4767 if (fast_rx->internal_forward) {
4768 struct sk_buff *xmit_skb = NULL;
4769 if (is_multicast_ether_addr(da)) {
4770 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4771 } else if (!ether_addr_equal(da, sa) &&
4772 sta_info_get(rx->sdata, da)) {
4779 * Send to wireless media and increase priority by 256
4780 * to keep the received priority instead of
4781 * reclassifying the frame (see cfg80211_classify8021d).
4783 xmit_skb->priority += 256;
4784 xmit_skb->protocol = htons(ETH_P_802_3);
4785 skb_reset_network_header(xmit_skb);
4786 skb_reset_mac_header(xmit_skb);
4787 dev_queue_xmit(xmit_skb);
4794 /* deliver to local stack */
4795 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4796 ieee80211_deliver_skb_to_local_stack(skb, rx);
4799 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4800 struct ieee80211_fast_rx *fast_rx)
4802 struct sk_buff *skb = rx->skb;
4803 struct ieee80211_hdr *hdr = (void *)skb->data;
4804 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4805 static ieee80211_rx_result res;
4806 int orig_len = skb->len;
4807 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4808 int snap_offs = hdrlen;
4810 u8 snap[sizeof(rfc1042_header)];
4812 } *payload __aligned(2);
4816 } addrs __aligned(2);
4817 struct ieee80211_sta_rx_stats *stats;
4819 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4820 * to a common data structure; drivers can implement that per queue
4821 * but we don't have that information in mac80211
4823 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4826 #define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4828 /* If using encryption, we also need to have:
4829 * - PN_VALIDATED: similar, but the implementation is tricky
4830 * - DECRYPTED: necessary for PN_VALIDATED
4833 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4836 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4839 if (unlikely(ieee80211_is_frag(hdr)))
4842 /* Since our interface address cannot be multicast, this
4843 * implicitly also rejects multicast frames without the
4846 * We shouldn't get any *data* frames not addressed to us
4847 * (AP mode will accept multicast *management* frames), but
4848 * punting here will make it go through the full checks in
4849 * ieee80211_accept_frame().
4851 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4854 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4855 IEEE80211_FCTL_TODS)) !=
4856 fast_rx->expected_ds_bits)
4859 /* assign the key to drop unencrypted frames (later)
4860 * and strip the IV/MIC if necessary
4862 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4863 /* GCMP header length is the same */
4864 snap_offs += IEEE80211_CCMP_HDR_LEN;
4867 if (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
4868 !(status->rx_flags & IEEE80211_RX_AMSDU)) {
4869 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4872 payload = (void *)(skb->data + snap_offs);
4874 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4877 /* Don't handle these here since they require special code.
4878 * Accept AARP and IPX even though they should come with a
4879 * bridge-tunnel header - but if we get them this way then
4880 * there's little point in discarding them.
4882 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4883 payload->proto == fast_rx->control_port_protocol))
4887 /* after this point, don't punt to the slowpath! */
4889 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4890 pskb_trim(skb, skb->len - fast_rx->icv_len))
4893 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4896 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4897 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4904 /* do the header conversion - first grab the addresses */
4905 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4906 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4907 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
4908 skb_pull(skb, snap_offs - 2);
4909 put_unaligned_be16(skb->len - 2, skb->data);
4911 skb_postpull_rcsum(skb, skb->data + snap_offs,
4912 sizeof(rfc1042_header) + 2);
4914 /* remove the SNAP but leave the ethertype */
4915 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4917 /* push the addresses in front */
4918 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4920 res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
4930 ieee80211_rx_8023(rx, fast_rx, orig_len);
4936 if (fast_rx->uses_rss)
4937 stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
4939 stats = &rx->link_sta->rx_stats;
4946 * This function returns whether or not the SKB
4947 * was destined for RX processing or not, which,
4948 * if consume is true, is equivalent to whether
4949 * or not the skb was consumed.
4951 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4952 struct sk_buff *skb, bool consume)
4954 struct ieee80211_local *local = rx->local;
4955 struct ieee80211_sub_if_data *sdata = rx->sdata;
4956 struct ieee80211_hdr *hdr = (void *)skb->data;
4957 struct link_sta_info *link_sta = rx->link_sta;
4958 struct ieee80211_link_data *link = rx->link;
4962 /* See if we can do fast-rx; if we have to copy we already lost,
4963 * so punt in that case. We should never have to deliver a data
4964 * frame to multiple interfaces anyway.
4966 * We skip the ieee80211_accept_frame() call and do the necessary
4967 * checking inside ieee80211_invoke_fast_rx().
4969 if (consume && rx->sta) {
4970 struct ieee80211_fast_rx *fast_rx;
4972 fast_rx = rcu_dereference(rx->sta->fast_rx);
4973 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4977 if (!ieee80211_accept_frame(rx))
4981 struct skb_shared_hwtstamps *shwt;
4983 rx->skb = skb_copy(skb, GFP_ATOMIC);
4985 if (net_ratelimit())
4986 wiphy_debug(local->hw.wiphy,
4987 "failed to copy skb for %s\n",
4992 /* skb_copy() does not copy the hw timestamps, so copy it
4995 shwt = skb_hwtstamps(rx->skb);
4996 shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
4998 /* Update the hdr pointer to the new skb for translation below */
4999 hdr = (struct ieee80211_hdr *)rx->skb->data;
5002 if (unlikely(rx->sta && rx->sta->sta.mlo) &&
5003 is_unicast_ether_addr(hdr->addr1) &&
5004 !ieee80211_is_probe_resp(hdr->frame_control) &&
5005 !ieee80211_is_beacon(hdr->frame_control)) {
5006 /* translate to MLD addresses */
5007 if (ether_addr_equal(link->conf->addr, hdr->addr1))
5008 ether_addr_copy(hdr->addr1, rx->sdata->vif.addr);
5009 if (ether_addr_equal(link_sta->addr, hdr->addr2))
5010 ether_addr_copy(hdr->addr2, rx->sta->addr);
5011 /* translate A3 only if it's the BSSID */
5012 if (!ieee80211_has_tods(hdr->frame_control) &&
5013 !ieee80211_has_fromds(hdr->frame_control)) {
5014 if (ether_addr_equal(link_sta->addr, hdr->addr3))
5015 ether_addr_copy(hdr->addr3, rx->sta->addr);
5016 else if (ether_addr_equal(link->conf->addr, hdr->addr3))
5017 ether_addr_copy(hdr->addr3, rx->sdata->vif.addr);
5019 /* not needed for A4 since it can only carry the SA */
5022 ieee80211_invoke_rx_handlers(rx);
5026 static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
5027 struct ieee80211_sta *pubsta,
5028 struct sk_buff *skb,
5029 struct list_head *list)
5031 struct ieee80211_local *local = hw_to_local(hw);
5032 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5033 struct ieee80211_fast_rx *fast_rx;
5034 struct ieee80211_rx_data rx;
5035 struct sta_info *sta;
5038 memset(&rx, 0, sizeof(rx));
5044 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5046 /* drop frame if too short for header */
5047 if (skb->len < sizeof(struct ethhdr))
5053 if (status->link_valid)
5054 link_id = status->link_id;
5057 * TODO: Should the frame be dropped if the right link_id is not
5058 * available? Or may be it is fine in the current form to proceed with
5059 * the frame processing because with frame being in 802.3 format,
5060 * link_id is used only for stats purpose and updating the stats on
5061 * the deflink is fine?
5063 sta = container_of(pubsta, struct sta_info, sta);
5064 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5067 fast_rx = rcu_dereference(rx.sta->fast_rx);
5071 ieee80211_rx_8023(&rx, fast_rx, skb->len);
5078 static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
5079 struct sk_buff *skb, bool consume)
5081 struct link_sta_info *link_sta;
5082 struct ieee80211_hdr *hdr = (void *)skb->data;
5083 struct sta_info *sta;
5087 * Look up link station first, in case there's a
5088 * chance that they might have a link address that
5089 * is identical to the MLD address, that way we'll
5090 * have the link information if needed.
5092 link_sta = link_sta_info_get_bss(rx->sdata, hdr->addr2);
5094 sta = link_sta->sta;
5095 link_id = link_sta->link_id;
5097 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5099 sta = sta_info_get_bss(rx->sdata, hdr->addr2);
5100 if (status->link_valid)
5101 link_id = status->link_id;
5104 if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
5107 return ieee80211_prepare_and_rx_handle(rx, skb, consume);
5111 * This is the actual Rx frames handler. as it belongs to Rx path it must
5112 * be called with rcu_read_lock protection.
5114 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
5115 struct ieee80211_sta *pubsta,
5116 struct sk_buff *skb,
5117 struct list_head *list)
5119 struct ieee80211_local *local = hw_to_local(hw);
5120 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5121 struct ieee80211_sub_if_data *sdata;
5122 struct ieee80211_hdr *hdr;
5124 struct ieee80211_rx_data rx;
5125 struct ieee80211_sub_if_data *prev;
5126 struct rhlist_head *tmp;
5129 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
5130 memset(&rx, 0, sizeof(rx));
5136 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
5137 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5139 if (ieee80211_is_mgmt(fc)) {
5140 /* drop frame if too short for header */
5141 if (skb->len < ieee80211_hdrlen(fc))
5144 err = skb_linearize(skb);
5146 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
5154 hdr = (struct ieee80211_hdr *)skb->data;
5155 ieee80211_parse_qos(&rx);
5156 ieee80211_verify_alignment(&rx);
5158 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5159 ieee80211_is_beacon(hdr->frame_control) ||
5160 ieee80211_is_s1g_beacon(hdr->frame_control)))
5161 ieee80211_scan_rx(local, skb);
5163 if (ieee80211_is_data(fc)) {
5164 struct sta_info *sta, *prev_sta;
5167 if (status->link_valid)
5168 link_id = status->link_id;
5171 sta = container_of(pubsta, struct sta_info, sta);
5172 if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
5176 * In MLO connection, fetch the link_id using addr2
5177 * when the driver does not pass link_id in status.
5178 * When the address translation is already performed by
5179 * driver/hw, the valid link_id must be passed in
5183 if (!status->link_valid && pubsta->mlo) {
5184 struct ieee80211_hdr *hdr = (void *)skb->data;
5185 struct link_sta_info *link_sta;
5187 link_sta = link_sta_info_get_bss(rx.sdata,
5192 ieee80211_rx_data_set_link(&rx, link_sta->link_id);
5195 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5202 for_each_sta_info(local, hdr->addr2, sta, tmp) {
5208 rx.sdata = prev_sta->sdata;
5209 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5212 if (!status->link_valid && prev_sta->sta.mlo)
5215 ieee80211_prepare_and_rx_handle(&rx, skb, false);
5221 rx.sdata = prev_sta->sdata;
5222 if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
5225 if (!status->link_valid && prev_sta->sta.mlo)
5228 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
5236 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5237 if (!ieee80211_sdata_running(sdata))
5240 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5241 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5245 * frame is destined for this interface, but if it's
5246 * not also for the previous one we handle that after
5247 * the loop to avoid copying the SKB once too much
5256 ieee80211_rx_for_interface(&rx, skb, false);
5264 if (ieee80211_rx_for_interface(&rx, skb, true))
5273 * This is the receive path handler. It is called by a low level driver when an
5274 * 802.11 MPDU is received from the hardware.
5276 void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5277 struct sk_buff *skb, struct list_head *list)
5279 struct ieee80211_local *local = hw_to_local(hw);
5280 struct ieee80211_rate *rate = NULL;
5281 struct ieee80211_supported_band *sband;
5282 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5283 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5285 WARN_ON_ONCE(softirq_count() == 0);
5287 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5290 sband = local->hw.wiphy->bands[status->band];
5291 if (WARN_ON(!sband))
5295 * If we're suspending, it is possible although not too likely
5296 * that we'd be receiving frames after having already partially
5297 * quiesced the stack. We can't process such frames then since
5298 * that might, for example, cause stations to be added or other
5299 * driver callbacks be invoked.
5301 if (unlikely(local->quiescing || local->suspended))
5304 /* We might be during a HW reconfig, prevent Rx for the same reason */
5305 if (unlikely(local->in_reconfig))
5309 * The same happens when we're not even started,
5310 * but that's worth a warning.
5312 if (WARN_ON(!local->started))
5315 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5317 * Validate the rate, unless a PLCP error means that
5318 * we probably can't have a valid rate here anyway.
5321 switch (status->encoding) {
5324 * rate_idx is MCS index, which can be [0-76]
5327 * https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5329 * Anything else would be some sort of driver or
5330 * hardware error. The driver should catch hardware
5333 if (WARN(status->rate_idx > 76,
5334 "Rate marked as an HT rate but passed "
5335 "status->rate_idx is not "
5336 "an MCS index [0-76]: %d (0x%02x)\n",
5342 if (WARN_ONCE(status->rate_idx > 11 ||
5345 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5346 status->rate_idx, status->nss))
5350 if (WARN_ONCE(status->rate_idx > 11 ||
5353 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5354 status->rate_idx, status->nss))
5358 if (WARN_ONCE(status->rate_idx > 15 ||
5361 status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
5362 "Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
5363 status->rate_idx, status->nss, status->eht.gi))
5370 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5372 rate = &sband->bitrates[status->rate_idx];
5376 if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5379 status->rx_flags = 0;
5381 kcov_remote_start_common(skb_get_kcov_handle(skb));
5384 * Frames with failed FCS/PLCP checksum are not returned,
5385 * all other frames are returned without radiotap header
5386 * if it was previously present.
5387 * Also, frames with less than 16 bytes are dropped.
5389 if (!(status->flag & RX_FLAG_8023))
5390 skb = ieee80211_rx_monitor(local, skb, rate);
5392 if ((status->flag & RX_FLAG_8023) ||
5393 ieee80211_is_data_present(hdr->frame_control))
5394 ieee80211_tpt_led_trig_rx(local, skb->len);
5396 if (status->flag & RX_FLAG_8023)
5397 __ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5399 __ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5407 EXPORT_SYMBOL(ieee80211_rx_list);
5409 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5410 struct sk_buff *skb, struct napi_struct *napi)
5412 struct sk_buff *tmp;
5417 * key references and virtual interfaces are protected using RCU
5418 * and this requires that we are in a read-side RCU section during
5419 * receive processing
5422 ieee80211_rx_list(hw, pubsta, skb, &list);
5426 netif_receive_skb_list(&list);
5430 list_for_each_entry_safe(skb, tmp, &list, list) {
5431 skb_list_del_init(skb);
5432 napi_gro_receive(napi, skb);
5435 EXPORT_SYMBOL(ieee80211_rx_napi);
5437 /* This is a version of the rx handler that can be called from hard irq
5438 * context. Post the skb on the queue and schedule the tasklet */
5439 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5441 struct ieee80211_local *local = hw_to_local(hw);
5443 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5445 skb->pkt_type = IEEE80211_RX_MSG;
5446 skb_queue_tail(&local->skb_queue, skb);
5447 tasklet_schedule(&local->tasklet);
5449 EXPORT_SYMBOL(ieee80211_rx_irqsafe);