1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
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) 2018-2025 Intel Corporation
10	*/
11
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 <kunit/visibility.h>
23	#include <net/mac80211.h>
24	#include <net/ieee80211_radiotap.h>
25	#include <linux/unaligned.h>
26
27	#include "ieee80211_i.h"
28	#include "driver-ops.h"
29	#include "led.h"
30	#include "mesh.h"
31	#include "wep.h"
32	#include "wpa.h"
33	#include "tkip.h"
34	#include "wme.h"
35	#include "rate.h"
36
37	/*
38	* monitor mode reception
39	*
40	* This function cleans up the SKB, i.e. it removes all the stuff
41	* only useful for monitoring.
42	*/
43	static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
44	unsigned int present_fcs_len,
45	unsigned int rtap_space)
46	{
47	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
48	struct ieee80211_hdr *hdr;
49	unsigned int hdrlen;
50	__le16 fc;
51
52	if (present_fcs_len)
53	__pskb_trim(skb, len: skb->len - present_fcs_len);
54	pskb_pull(skb, len: rtap_space);
55
56	/* After pulling radiotap header, clear all flags that indicate
57	* info in skb->data.
58	*/
59	status->flag &= ~(RX_FLAG_RADIOTAP_TLV_AT_END |
60	RX_FLAG_RADIOTAP_LSIG |
61	RX_FLAG_RADIOTAP_HE_MU |
62	RX_FLAG_RADIOTAP_HE);
63
64	hdr = (void *)skb->data;
65	fc = hdr->frame_control;
66
67	/*
68	* Remove the HT-Control field (if present) on management
69	* frames after we've sent the frame to monitoring. We
70	* (currently) don't need it, and don't properly parse
71	* frames with it present, due to the assumption of a
72	* fixed management header length.
73	*/
74	if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc)))
75	return skb;
76
77	hdrlen = ieee80211_hdrlen(fc);
78	hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
79
80	if (!pskb_may_pull(skb, len: hdrlen)) {
81	dev_kfree_skb(skb);
82	return NULL;
83	}
84
85	memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
86	hdrlen - IEEE80211_HT_CTL_LEN);
87	pskb_pull(skb, IEEE80211_HT_CTL_LEN);
88
89	return skb;
90	}
91
92	static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
93	unsigned int rtap_space)
94	{
95	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
96	struct ieee80211_hdr *hdr;
97
98	hdr = (void *)(skb->data + rtap_space);
99
100	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
101	RX_FLAG_FAILED_PLCP_CRC |
102	RX_FLAG_ONLY_MONITOR |
103	RX_FLAG_NO_PSDU))
104	return true;
105
106	if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
107	return true;
108
109	if (ieee80211_is_ctl(fc: hdr->frame_control) &&
110	!ieee80211_is_pspoll(fc: hdr->frame_control) &&
111	!ieee80211_is_back_req(fc: hdr->frame_control))
112	return true;
113
114	return false;
115	}
116
117	static int
118	ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
119	struct ieee80211_rx_status *status,
120	struct sk_buff *skb)
121	{
122	int len;
123
124	/* always present fields */
125	len = sizeof(struct ieee80211_radiotap_header) + 8;
126
127	/* allocate extra bitmaps */
128	if (status->chains)
129	len += 4 * hweight8(status->chains);
130
131	if (ieee80211_have_rx_timestamp(status)) {
132	len = ALIGN(len, 8);
133	len += 8;
134	}
135	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
136	len += 1;
137
138	/* antenna field, if we don't have per-chain info */
139	if (!status->chains)
140	len += 1;
141
142	/* padding for RX_FLAGS if necessary */
143	len = ALIGN(len, 2);
144
145	if (status->encoding == RX_ENC_HT) /* HT info */
146	len += 3;
147
148	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
149	len = ALIGN(len, 4);
150	len += 8;
151	}
152
153	if (status->encoding == RX_ENC_VHT) {
154	len = ALIGN(len, 2);
155	len += 12;
156	}
157
158	if (local->hw.radiotap_timestamp.units_pos >= 0) {
159	len = ALIGN(len, 8);
160	len += 12;
161	}
162
163	if (status->encoding == RX_ENC_HE &&
164	status->flag & RX_FLAG_RADIOTAP_HE) {
165	len = ALIGN(len, 2);
166	len += 12;
167	BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
168	}
169
170	if (status->encoding == RX_ENC_HE &&
171	status->flag & RX_FLAG_RADIOTAP_HE_MU) {
172	len = ALIGN(len, 2);
173	len += 12;
174	BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
175	}
176
177	if (status->flag & RX_FLAG_NO_PSDU)
178	len += 1;
179
180	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
181	len = ALIGN(len, 2);
182	len += 4;
183	BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
184	}
185
186	if (status->chains) {
187	/* antenna and antenna signal fields */
188	len += 2 * hweight8(status->chains);
189	}
190
191	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
192	int tlv_offset = 0;
193
194	/*
195	* The position to look at depends on the existence (or non-
196	* existence) of other elements, so take that into account...
197	*/
198	if (status->flag & RX_FLAG_RADIOTAP_HE)
199	tlv_offset +=
200	sizeof(struct ieee80211_radiotap_he);
201	if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
202	tlv_offset +=
203	sizeof(struct ieee80211_radiotap_he_mu);
204	if (status->flag & RX_FLAG_RADIOTAP_LSIG)
205	tlv_offset +=
206	sizeof(struct ieee80211_radiotap_lsig);
207
208	/* ensure 4 byte alignment for TLV */
209	len = ALIGN(len, 4);
210
211	/* TLVs until the mac header */
212	len += skb_mac_header(skb) - &skb->data[tlv_offset];
213	}
214
215	return len;
216	}
217
218	static void __ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
219	int link_id,
220	struct sta_info *sta,
221	struct sk_buff *skb)
222	{
223	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
224
225	if (link_id >= 0) {
226	status->link_valid = 1;
227	status->link_id = link_id;
228	} else {
229	status->link_valid = 0;
230	}
231
232	skb_queue_tail(list: &sdata->skb_queue, newsk: skb);
233	wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work);
234	if (sta)
235	sta->deflink.rx_stats.packets++;
236	}
237
238	static void ieee80211_queue_skb_to_iface(struct ieee80211_sub_if_data *sdata,
239	int link_id,
240	struct sta_info *sta,
241	struct sk_buff *skb)
242	{
243	skb->protocol = 0;
244	__ieee80211_queue_skb_to_iface(sdata, link_id, sta, skb);
245	}
246
247	static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
248	struct sk_buff *skb,
249	int rtap_space)
250	{
251	struct {
252	struct ieee80211_hdr_3addr hdr;
253	u8 category;
254	u8 action_code;
255	} __packed __aligned(2) action;
256
257	if (!sdata)
258	return;
259
260	BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
261
262	if (skb->len < rtap_space + sizeof(action) +
263	VHT_MUMIMO_GROUPS_DATA_LEN)
264	return;
265
266	if (!is_valid_ether_addr(addr: sdata->u.mntr.mu_follow_addr))
267	return;
268
269	skb_copy_bits(skb, offset: rtap_space, to: &action, len: sizeof(action));
270
271	if (!ieee80211_is_action(fc: action.hdr.frame_control))
272	return;
273
274	if (action.category != WLAN_CATEGORY_VHT)
275	return;
276
277	if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
278	return;
279
280	if (!ether_addr_equal(addr1: action.hdr.addr1, addr2: sdata->u.mntr.mu_follow_addr))
281	return;
282
283	skb = skb_copy(skb, GFP_ATOMIC);
284	if (!skb)
285	return;
286
287	ieee80211_queue_skb_to_iface(sdata, link_id: -1, NULL, skb);
288	}
289
290	/*
291	* ieee80211_add_rx_radiotap_header - add radiotap header
292	*
293	* add a radiotap header containing all the fields which the hardware provided.
294	*/
295	static void
296	ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
297	struct sk_buff *skb,
298	struct ieee80211_rate *rate,
299	int rtap_len, bool has_fcs)
300	{
301	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
302	struct ieee80211_radiotap_header *rthdr;
303	unsigned char *pos;
304	__le32 *it_present;
305	u32 it_present_val;
306	u16 rx_flags = 0;
307	u16 channel_flags = 0;
308	u32 tlvs_len = 0;
309	int mpdulen, chain;
310	unsigned long chains = status->chains;
311	struct ieee80211_radiotap_he he = {};
312	struct ieee80211_radiotap_he_mu he_mu = {};
313	struct ieee80211_radiotap_lsig lsig = {};
314
315	if (status->flag & RX_FLAG_RADIOTAP_HE) {
316	he = *(struct ieee80211_radiotap_he *)skb->data;
317	skb_pull(skb, len: sizeof(he));
318	WARN_ON_ONCE(status->encoding != RX_ENC_HE);
319	}
320
321	if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
322	he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
323	skb_pull(skb, len: sizeof(he_mu));
324	}
325
326	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
327	lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
328	skb_pull(skb, len: sizeof(lsig));
329	}
330
331	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END) {
332	/* data is pointer at tlv all other info was pulled off */
333	tlvs_len = skb_mac_header(skb) - skb->data;
334	}
335
336	mpdulen = skb->len;
337	if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
338	mpdulen += FCS_LEN;
339
340	rthdr = skb_push(skb, len: rtap_len - tlvs_len);
341	memset(rthdr, 0, rtap_len - tlvs_len);
342	it_present = &rthdr->it_present;
343
344	/* radiotap header, set always present flags */
345	rthdr->it_len = cpu_to_le16(rtap_len);
346	it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
347	BIT(IEEE80211_RADIOTAP_CHANNEL) |
348	BIT(IEEE80211_RADIOTAP_RX_FLAGS);
349
350	if (!status->chains)
351	it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
352
353	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
354	it_present_val |=
355	BIT(IEEE80211_RADIOTAP_EXT) |
356	BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
357	put_unaligned_le32(val: it_present_val, p: it_present);
358	it_present++;
359	it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
360	BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
361	}
362
363	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
364	it_present_val |= BIT(IEEE80211_RADIOTAP_TLV);
365
366	put_unaligned_le32(val: it_present_val, p: it_present);
367
368	/* This references through an offset into it_optional[] rather
369	* than via it_present otherwise later uses of pos will cause
370	* the compiler to think we have walked past the end of the
371	* struct member.
372	*/
373	pos = (void *)&rthdr->it_optional[it_present + 1 - rthdr->it_optional];
374
375	/* the order of the following fields is important */
376
377	/* IEEE80211_RADIOTAP_TSFT */
378	if (ieee80211_have_rx_timestamp(status)) {
379	/* padding */
380	while ((pos - (u8 *)rthdr) & 7)
381	*pos++ = 0;
382	put_unaligned_le64(
383	val: ieee80211_calculate_rx_timestamp(local, status,
384	mpdu_len: mpdulen, mpdu_offset: 0),
385	p: pos);
386	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_TSFT));
387	pos += 8;
388	}
389
390	/* IEEE80211_RADIOTAP_FLAGS */
391	if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
392	*pos |= IEEE80211_RADIOTAP_F_FCS;
393	if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
394	*pos |= IEEE80211_RADIOTAP_F_BADFCS;
395	if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
396	*pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
397	pos++;
398
399	/* IEEE80211_RADIOTAP_RATE */
400	if (!rate || status->encoding != RX_ENC_LEGACY) {
401	/*
402	* Without rate information don't add it. If we have,
403	* MCS information is a separate field in radiotap,
404	* added below. The byte here is needed as padding
405	* for the channel though, so initialise it to 0.
406	*/
407	*pos = 0;
408	} else {
409	int shift = 0;
410	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
411	if (status->bw == RATE_INFO_BW_10)
412	shift = 1;
413	else if (status->bw == RATE_INFO_BW_5)
414	shift = 2;
415	*pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
416	}
417	pos++;
418
419	/* IEEE80211_RADIOTAP_CHANNEL */
420	/* TODO: frequency offset in KHz */
421	put_unaligned_le16(val: status->freq, p: pos);
422	pos += 2;
423	if (status->bw == RATE_INFO_BW_10)
424	channel_flags |= IEEE80211_CHAN_HALF;
425	else if (status->bw == RATE_INFO_BW_5)
426	channel_flags |= IEEE80211_CHAN_QUARTER;
427
428	if (status->band == NL80211_BAND_5GHZ ||
429	status->band == NL80211_BAND_6GHZ)
430	channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
431	else if (status->encoding != RX_ENC_LEGACY)
432	channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
433	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
434	channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
435	else if (rate)
436	channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
437	else
438	channel_flags |= IEEE80211_CHAN_2GHZ;
439	put_unaligned_le16(val: channel_flags, p: pos);
440	pos += 2;
441
442	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
443	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
444	!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
445	*pos = status->signal;
446	rthdr->it_present |=
447	cpu_to_le32(BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL));
448	pos++;
449	}
450
451	/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
452
453	if (!status->chains) {
454	/* IEEE80211_RADIOTAP_ANTENNA */
455	*pos = status->antenna;
456	pos++;
457	}
458
459	/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
460
461	/* IEEE80211_RADIOTAP_RX_FLAGS */
462	/* ensure 2 byte alignment for the 2 byte field as required */
463	if ((pos - (u8 *)rthdr) & 1)
464	*pos++ = 0;
465	if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
466	rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
467	put_unaligned_le16(val: rx_flags, p: pos);
468	pos += 2;
469
470	if (status->encoding == RX_ENC_HT) {
471	unsigned int stbc;
472
473	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
474	*pos = local->hw.radiotap_mcs_details;
475	if (status->enc_flags & RX_ENC_FLAG_HT_GF)
476	*pos |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;
477	if (status->enc_flags & RX_ENC_FLAG_LDPC)
478	*pos |= IEEE80211_RADIOTAP_MCS_HAVE_FEC;
479	pos++;
480	*pos = 0;
481	if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
482	*pos |= IEEE80211_RADIOTAP_MCS_SGI;
483	if (status->bw == RATE_INFO_BW_40)
484	*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
485	if (status->enc_flags & RX_ENC_FLAG_HT_GF)
486	*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
487	if (status->enc_flags & RX_ENC_FLAG_LDPC)
488	*pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
489	stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
490	*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
491	pos++;
492	*pos++ = status->rate_idx;
493	}
494
495	if (status->flag & RX_FLAG_AMPDU_DETAILS) {
496	u16 flags = 0;
497
498	/* ensure 4 byte alignment */
499	while ((pos - (u8 *)rthdr) & 3)
500	pos++;
501	rthdr->it_present |=
502	cpu_to_le32(BIT(IEEE80211_RADIOTAP_AMPDU_STATUS));
503	put_unaligned_le32(val: status->ampdu_reference, p: pos);
504	pos += 4;
505	if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
506	flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
507	if (status->flag & RX_FLAG_AMPDU_IS_LAST)
508	flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
509	if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
510	flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
511	if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
512	flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
513	if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
514	flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
515	put_unaligned_le16(val: flags, p: pos);
516	pos += 2;
517	*pos++ = 0;
518	*pos++ = 0;
519	}
520
521	if (status->encoding == RX_ENC_VHT) {
522	u16 known = local->hw.radiotap_vht_details;
523
524	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
525	put_unaligned_le16(val: known, p: pos);
526	pos += 2;
527	/* flags */
528	if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
529	*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
530	/* in VHT, STBC is binary */
531	if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
532	*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
533	if (status->enc_flags & RX_ENC_FLAG_BF)
534	*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
535	pos++;
536	/* bandwidth */
537	switch (status->bw) {
538	case RATE_INFO_BW_80:
539	*pos++ = 4;
540	break;
541	case RATE_INFO_BW_160:
542	*pos++ = 11;
543	break;
544	case RATE_INFO_BW_40:
545	*pos++ = 1;
546	break;
547	default:
548	*pos++ = 0;
549	}
550	/* MCS/NSS */
551	*pos = (status->rate_idx << 4) | status->nss;
552	pos += 4;
553	/* coding field */
554	if (status->enc_flags & RX_ENC_FLAG_LDPC)
555	*pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
556	pos++;
557	/* group ID */
558	pos++;
559	/* partial_aid */
560	pos += 2;
561	}
562
563	if (local->hw.radiotap_timestamp.units_pos >= 0) {
564	u16 accuracy = 0;
565	u8 flags;
566	u64 ts;
567
568	rthdr->it_present |=
569	cpu_to_le32(BIT(IEEE80211_RADIOTAP_TIMESTAMP));
570
571	/* ensure 8 byte alignment */
572	while ((pos - (u8 *)rthdr) & 7)
573	pos++;
574
575	if (status->flag & RX_FLAG_MACTIME_IS_RTAP_TS64) {
576	flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT;
577	ts = status->mactime;
578	} else {
579	flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
580	ts = status->device_timestamp;
581	}
582
583	put_unaligned_le64(val: ts, p: pos);
584	pos += sizeof(u64);
585
586	if (local->hw.radiotap_timestamp.accuracy >= 0) {
587	accuracy = local->hw.radiotap_timestamp.accuracy;
588	flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
589	}
590	put_unaligned_le16(val: accuracy, p: pos);
591	pos += sizeof(u16);
592
593	*pos++ = local->hw.radiotap_timestamp.units_pos;
594	*pos++ = flags;
595	}
596
597	if (status->encoding == RX_ENC_HE &&
598	status->flag & RX_FLAG_RADIOTAP_HE) {
599	#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
600
601	if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
602	he.data6 |= HE_PREP(DATA6_NSTS,
603	FIELD_GET(RX_ENC_FLAG_STBC_MASK,
604	status->enc_flags));
605	he.data3 |= HE_PREP(DATA3_STBC, 1);
606	} else {
607	he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
608	}
609
610	#define CHECK_GI(s) \
611	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
612	(int)NL80211_RATE_INFO_HE_GI_##s)
613
614	CHECK_GI(0_8);
615	CHECK_GI(1_6);
616	CHECK_GI(3_2);
617
618	he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
619	he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
620	he.data3 |= HE_PREP(DATA3_CODING,
621	!!(status->enc_flags & RX_ENC_FLAG_LDPC));
622
623	he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
624
625	switch (status->bw) {
626	case RATE_INFO_BW_20:
627	he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
628	IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
629	break;
630	case RATE_INFO_BW_40:
631	he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
632	IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
633	break;
634	case RATE_INFO_BW_80:
635	he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
636	IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
637	break;
638	case RATE_INFO_BW_160:
639	he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
640	IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
641	break;
642	case RATE_INFO_BW_HE_RU:
643	#define CHECK_RU_ALLOC(s) \
644	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
645	NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
646
647	CHECK_RU_ALLOC(26);
648	CHECK_RU_ALLOC(52);
649	CHECK_RU_ALLOC(106);
650	CHECK_RU_ALLOC(242);
651	CHECK_RU_ALLOC(484);
652	CHECK_RU_ALLOC(996);
653	CHECK_RU_ALLOC(2x996);
654
655	he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
656	status->he_ru + 4);
657	break;
658	default:
659	WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
660	}
661
662	/* ensure 2 byte alignment */
663	while ((pos - (u8 *)rthdr) & 1)
664	pos++;
665	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
666	memcpy(pos, &he, sizeof(he));
667	pos += sizeof(he);
668	}
669
670	if (status->encoding == RX_ENC_HE &&
671	status->flag & RX_FLAG_RADIOTAP_HE_MU) {
672	/* ensure 2 byte alignment */
673	while ((pos - (u8 *)rthdr) & 1)
674	pos++;
675	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE_MU));
676	memcpy(pos, &he_mu, sizeof(he_mu));
677	pos += sizeof(he_mu);
678	}
679
680	if (status->flag & RX_FLAG_NO_PSDU) {
681	rthdr->it_present |=
682	cpu_to_le32(BIT(IEEE80211_RADIOTAP_ZERO_LEN_PSDU));
683	*pos++ = status->zero_length_psdu_type;
684	}
685
686	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
687	/* ensure 2 byte alignment */
688	while ((pos - (u8 *)rthdr) & 1)
689	pos++;
690	rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_LSIG));
691	memcpy(pos, &lsig, sizeof(lsig));
692	pos += sizeof(lsig);
693	}
694
695	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
696	*pos++ = status->chain_signal[chain];
697	*pos++ = chain;
698	}
699	}
700
701	static struct sk_buff *
702	ieee80211_make_monitor_skb(struct ieee80211_local *local,
703	struct sk_buff **origskb,
704	struct ieee80211_rate *rate,
705	int rtap_space, bool use_origskb)
706	{
707	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: *origskb);
708	int rt_hdrlen, needed_headroom;
709	struct sk_buff *skb;
710
711	/* room for the radiotap header based on driver features */
712	rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, skb: *origskb);
713	needed_headroom = rt_hdrlen - rtap_space;
714
715	if (use_origskb) {
716	/* only need to expand headroom if necessary */
717	skb = *origskb;
718	*origskb = NULL;
719
720	/*
721	* This shouldn't trigger often because most devices have an
722	* RX header they pull before we get here, and that should
723	* be big enough for our radiotap information. We should
724	* probably export the length to drivers so that we can have
725	* them allocate enough headroom to start with.
726	*/
727	if (skb_headroom(skb) < needed_headroom &&
728	pskb_expand_head(skb, nhead: needed_headroom, ntail: 0, GFP_ATOMIC)) {
729	dev_kfree_skb(skb);
730	return NULL;
731	}
732	} else {
733	/*
734	* Need to make a copy and possibly remove radiotap header
735	* and FCS from the original.
736	*/
737	skb = skb_copy_expand(skb: *origskb, newheadroom: needed_headroom + NET_SKB_PAD,
738	newtailroom: 0, GFP_ATOMIC);
739
740	if (!skb)
741	return NULL;
742	}
743
744	/* prepend radiotap information */
745	ieee80211_add_rx_radiotap_header(local, skb, rate, rtap_len: rt_hdrlen, has_fcs: true);
746
747	skb_reset_mac_header(skb);
748	skb->ip_summed = CHECKSUM_UNNECESSARY;
749	skb->pkt_type = PACKET_OTHERHOST;
750	skb->protocol = htons(ETH_P_802_2);
751
752	return skb;
753	}
754
755	/*
756	* This function copies a received frame to all monitor interfaces and
757	* returns a cleaned-up SKB that no longer includes the FCS nor the
758	* radiotap header the driver might have added.
759	*/
760	static struct sk_buff *
761	ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
762	struct ieee80211_rate *rate)
763	{
764	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: origskb);
765	struct ieee80211_sub_if_data *sdata, *prev_sdata = NULL;
766	struct sk_buff *skb, *monskb = NULL;
767	int present_fcs_len = 0;
768	unsigned int rtap_space = 0;
769	struct ieee80211_sub_if_data *monitor_sdata =
770	rcu_dereference(local->monitor_sdata);
771	bool only_monitor = false;
772	unsigned int min_head_len;
773
774	if (WARN_ON_ONCE(status->flag & RX_FLAG_RADIOTAP_TLV_AT_END &&
775	!skb_mac_header_was_set(origskb))) {
776	/* with this skb no way to know where frame payload starts */
777	dev_kfree_skb(origskb);
778	return NULL;
779	}
780
781	if (status->flag & RX_FLAG_RADIOTAP_HE)
782	rtap_space += sizeof(struct ieee80211_radiotap_he);
783
784	if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
785	rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
786
787	if (status->flag & RX_FLAG_RADIOTAP_LSIG)
788	rtap_space += sizeof(struct ieee80211_radiotap_lsig);
789
790	if (status->flag & RX_FLAG_RADIOTAP_TLV_AT_END)
791	rtap_space += skb_mac_header(skb: origskb) - &origskb->data[rtap_space];
792
793	min_head_len = rtap_space;
794
795	/*
796	* First, we may need to make a copy of the skb because
797	* (1) we need to modify it for radiotap (if not present), and
798	* (2) the other RX handlers will modify the skb we got.
799	*
800	* We don't need to, of course, if we aren't going to return
801	* the SKB because it has a bad FCS/PLCP checksum.
802	*/
803
804	if (!(status->flag & RX_FLAG_NO_PSDU)) {
805	if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
806	if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
807	/* driver bug */
808	WARN_ON(1);
809	dev_kfree_skb(origskb);
810	return NULL;
811	}
812	present_fcs_len = FCS_LEN;
813	}
814
815	/* also consider the hdr->frame_control */
816	min_head_len += 2;
817	}
818
819	/* ensure that the expected data elements are in skb head */
820	if (!pskb_may_pull(skb: origskb, len: min_head_len)) {
821	dev_kfree_skb(origskb);
822	return NULL;
823	}
824
825	only_monitor = should_drop_frame(skb: origskb, present_fcs_len, rtap_space);
826
827	if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
828	if (only_monitor) {
829	dev_kfree_skb(origskb);
830	return NULL;
831	}
832
833	return ieee80211_clean_skb(skb: origskb, present_fcs_len,
834	rtap_space);
835	}
836
837	ieee80211_handle_mu_mimo_mon(sdata: monitor_sdata, skb: origskb, rtap_space);
838
839	list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
840	struct cfg80211_chan_def *chandef;
841
842	chandef = &sdata->vif.bss_conf.chanreq.oper;
843	if (chandef->chan &&
844	chandef->chan->center_freq != status->freq)
845	continue;
846
847	if (!prev_sdata) {
848	prev_sdata = sdata;
849	continue;
850	}
851
852	if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
853	ieee80211_handle_mu_mimo_mon(sdata, skb: origskb, rtap_space);
854
855	if (!monskb)
856	monskb = ieee80211_make_monitor_skb(local, origskb: &origskb,
857	rate, rtap_space,
858	use_origskb: false);
859	if (!monskb)
860	continue;
861
862	skb = skb_clone(skb: monskb, GFP_ATOMIC);
863	if (!skb)
864	continue;
865
866	skb->dev = prev_sdata->dev;
867	dev_sw_netstats_rx_add(dev: skb->dev, len: skb->len);
868	netif_receive_skb(skb);
869	prev_sdata = sdata;
870	}
871
872	if (prev_sdata) {
873	if (monskb)
874	skb = monskb;
875	else
876	skb = ieee80211_make_monitor_skb(local, origskb: &origskb,
877	rate, rtap_space,
878	use_origskb: only_monitor);
879	if (skb) {
880	skb->dev = prev_sdata->dev;
881	dev_sw_netstats_rx_add(dev: skb->dev, len: skb->len);
882	netif_receive_skb(skb);
883	}
884	}
885
886	if (!origskb)
887	return NULL;
888
889	return ieee80211_clean_skb(skb: origskb, present_fcs_len, rtap_space);
890	}
891
892	static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
893	{
894	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
895	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
896	int tid, seqno_idx, security_idx;
897
898	/* does the frame have a qos control field? */
899	if (ieee80211_is_data_qos(fc: hdr->frame_control)) {
900	u8 *qc = ieee80211_get_qos_ctl(hdr);
901	/* frame has qos control */
902	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
903	if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
904	status->rx_flags |= IEEE80211_RX_AMSDU;
905
906	seqno_idx = tid;
907	security_idx = tid;
908	} else {
909	/*
910	* IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
911	*
912	* Sequence numbers for management frames, QoS data
913	* frames with a broadcast/multicast address in the
914	* Address 1 field, and all non-QoS data frames sent
915	* by QoS STAs are assigned using an additional single
916	* modulo-4096 counter, [...]
917	*
918	* We also use that counter for non-QoS STAs.
919	*/
920	seqno_idx = IEEE80211_NUM_TIDS;
921	security_idx = 0;
922	if (ieee80211_is_mgmt(fc: hdr->frame_control))
923	security_idx = IEEE80211_NUM_TIDS;
924	tid = 0;
925	}
926
927	rx->seqno_idx = seqno_idx;
928	rx->security_idx = security_idx;
929	/* Set skb->priority to 1d tag if highest order bit of TID is not set.
930	* For now, set skb->priority to 0 for other cases. */
931	rx->skb->priority = (tid > 7) ? 0 : tid;
932	}
933
934	/**
935	* DOC: Packet alignment
936	*
937	* Drivers always need to pass packets that are aligned to two-byte boundaries
938	* to the stack.
939	*
940	* Additionally, they should, if possible, align the payload data in a way that
941	* guarantees that the contained IP header is aligned to a four-byte
942	* boundary. In the case of regular frames, this simply means aligning the
943	* payload to a four-byte boundary (because either the IP header is directly
944	* contained, or IV/RFC1042 headers that have a length divisible by four are
945	* in front of it). If the payload data is not properly aligned and the
946	* architecture doesn't support efficient unaligned operations, mac80211
947	* will align the data.
948	*
949	* With A-MSDU frames, however, the payload data address must yield two modulo
950	* four because there are 14-byte 802.3 headers within the A-MSDU frames that
951	* push the IP header further back to a multiple of four again. Thankfully, the
952	* specs were sane enough this time around to require padding each A-MSDU
953	* subframe to a length that is a multiple of four.
954	*
955	* Padding like Atheros hardware adds which is between the 802.11 header and
956	* the payload is not supported; the driver is required to move the 802.11
957	* header to be directly in front of the payload in that case.
958	*/
959	static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
960	{
961	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
962	WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
963	#endif
964	}
965
966
967	/* rx handlers */
968
969	static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
970	{
971	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
972
973	if (is_multicast_ether_addr(addr: hdr->addr1))
974	return 0;
975
976	return ieee80211_is_robust_mgmt_frame(skb);
977	}
978
979
980	static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
981	{
982	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
983
984	if (!is_multicast_ether_addr(addr: hdr->addr1))
985	return 0;
986
987	return ieee80211_is_robust_mgmt_frame(skb);
988	}
989
990
991	/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
992	static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
993	{
994	struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
995	struct ieee80211_mmie *mmie;
996	struct ieee80211_mmie_16 *mmie16;
997
998	if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(addr: hdr->da))
999	return -1;
1000
1001	if (!ieee80211_is_robust_mgmt_frame(skb) &&
1002	!ieee80211_is_beacon(fc: hdr->frame_control))
1003	return -1; /* not a robust management frame */
1004
1005	mmie = (struct ieee80211_mmie *)
1006	(skb->data + skb->len - sizeof(*mmie));
1007	if (mmie->element_id == WLAN_EID_MMIE &&
1008	mmie->length == sizeof(*mmie) - 2)
1009	return le16_to_cpu(mmie->key_id);
1010
1011	mmie16 = (struct ieee80211_mmie_16 *)
1012	(skb->data + skb->len - sizeof(*mmie16));
1013	if (skb->len >= 24 + sizeof(*mmie16) &&
1014	mmie16->element_id == WLAN_EID_MMIE &&
1015	mmie16->length == sizeof(*mmie16) - 2)
1016	return le16_to_cpu(mmie16->key_id);
1017
1018	return -1;
1019	}
1020
1021	static int ieee80211_get_keyid(struct sk_buff *skb)
1022	{
1023	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1024	__le16 fc = hdr->frame_control;
1025	int hdrlen = ieee80211_hdrlen(fc);
1026	u8 keyid;
1027
1028	/* WEP, TKIP, CCMP and GCMP */
1029	if (unlikely(skb->len < hdrlen + IEEE80211_WEP_IV_LEN))
1030	return -EINVAL;
1031
1032	skb_copy_bits(skb, offset: hdrlen + 3, to: &keyid, len: 1);
1033
1034	keyid >>= 6;
1035
1036	return keyid;
1037	}
1038
1039	static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1040	{
1041	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1042	char *dev_addr = rx->sdata->vif.addr;
1043
1044	if (ieee80211_is_data(fc: hdr->frame_control)) {
1045	if (is_multicast_ether_addr(addr: hdr->addr1)) {
1046	if (ieee80211_has_tods(fc: hdr->frame_control) ||
1047	!ieee80211_has_fromds(fc: hdr->frame_control))
1048	return RX_DROP;
1049	if (ether_addr_equal(addr1: hdr->addr3, addr2: dev_addr))
1050	return RX_DROP;
1051	} else {
1052	if (!ieee80211_has_a4(fc: hdr->frame_control))
1053	return RX_DROP;
1054	if (ether_addr_equal(addr1: hdr->addr4, addr2: dev_addr))
1055	return RX_DROP;
1056	}
1057	}
1058
1059	/* If there is not an established peer link and this is not a peer link
1060	* establisment frame, beacon or probe, drop the frame.
1061	*/
1062
1063	if (!rx->sta || sta_plink_state(sta: rx->sta) != NL80211_PLINK_ESTAB) {
1064	struct ieee80211_mgmt *mgmt;
1065
1066	if (!ieee80211_is_mgmt(fc: hdr->frame_control))
1067	return RX_DROP;
1068
1069	if (ieee80211_is_action(fc: hdr->frame_control)) {
1070	u8 category;
1071
1072	/* make sure category field is present */
1073	if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1074	return RX_DROP;
1075
1076	mgmt = (struct ieee80211_mgmt *)hdr;
1077	category = mgmt->u.action.category;
1078	if (category != WLAN_CATEGORY_MESH_ACTION &&
1079	category != WLAN_CATEGORY_SELF_PROTECTED)
1080	return RX_DROP;
1081	return RX_CONTINUE;
1082	}
1083
1084	if (ieee80211_is_probe_req(fc: hdr->frame_control) ||
1085	ieee80211_is_probe_resp(fc: hdr->frame_control) ||
1086	ieee80211_is_beacon(fc: hdr->frame_control) ||
1087	ieee80211_is_auth(fc: hdr->frame_control))
1088	return RX_CONTINUE;
1089
1090	return RX_DROP;
1091	}
1092
1093	return RX_CONTINUE;
1094	}
1095
1096	static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1097	int index)
1098	{
1099	struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1100	struct sk_buff *tail = skb_peek_tail(list_: frames);
1101	struct ieee80211_rx_status *status;
1102
1103	if (tid_agg_rx->reorder_buf_filtered &&
1104	tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1105	return true;
1106
1107	if (!tail)
1108	return false;
1109
1110	status = IEEE80211_SKB_RXCB(skb: tail);
1111	if (status->flag & RX_FLAG_AMSDU_MORE)
1112	return false;
1113
1114	return true;
1115	}
1116
1117	static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1118	struct tid_ampdu_rx *tid_agg_rx,
1119	int index,
1120	struct sk_buff_head *frames)
1121	{
1122	struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1123	struct sk_buff *skb;
1124	struct ieee80211_rx_status *status;
1125
1126	lockdep_assert_held(&tid_agg_rx->reorder_lock);
1127
1128	if (skb_queue_empty(list: skb_list))
1129	goto no_frame;
1130
1131	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1132	__skb_queue_purge(list: skb_list);
1133	goto no_frame;
1134	}
1135
1136	/* release frames from the reorder ring buffer */
1137	tid_agg_rx->stored_mpdu_num--;
1138	while ((skb = __skb_dequeue(list: skb_list))) {
1139	status = IEEE80211_SKB_RXCB(skb);
1140	status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1141	__skb_queue_tail(list: frames, newsk: skb);
1142	}
1143
1144	no_frame:
1145	if (tid_agg_rx->reorder_buf_filtered)
1146	tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1147	tid_agg_rx->head_seq_num = ieee80211_sn_inc(sn: tid_agg_rx->head_seq_num);
1148	}
1149
1150	static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1151	struct tid_ampdu_rx *tid_agg_rx,
1152	u16 head_seq_num,
1153	struct sk_buff_head *frames)
1154	{
1155	int index;
1156
1157	lockdep_assert_held(&tid_agg_rx->reorder_lock);
1158
1159	while (ieee80211_sn_less(sn1: tid_agg_rx->head_seq_num, sn2: head_seq_num)) {
1160	index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1161	ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1162	frames);
1163	}
1164	}
1165
1166	/*
1167	* Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1168	* the skb was added to the buffer longer than this time ago, the earlier
1169	* frames that have not yet been received are assumed to be lost and the skb
1170	* can be released for processing. This may also release other skb's from the
1171	* reorder buffer if there are no additional gaps between the frames.
1172	*
1173	* Callers must hold tid_agg_rx->reorder_lock.
1174	*/
1175	#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1176
1177	static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1178	struct tid_ampdu_rx *tid_agg_rx,
1179	struct sk_buff_head *frames)
1180	{
1181	int index, i, j;
1182
1183	lockdep_assert_held(&tid_agg_rx->reorder_lock);
1184
1185	/* release the buffer until next missing frame */
1186	index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1187	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1188	tid_agg_rx->stored_mpdu_num) {
1189	/*
1190	* No buffers ready to be released, but check whether any
1191	* frames in the reorder buffer have timed out.
1192	*/
1193	int skipped = 1;
1194	for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1195	j = (j + 1) % tid_agg_rx->buf_size) {
1196	if (!ieee80211_rx_reorder_ready(tid_agg_rx, index: j)) {
1197	skipped++;
1198	continue;
1199	}
1200	if (skipped &&
1201	!time_after(jiffies, tid_agg_rx->reorder_time[j] +
1202	HT_RX_REORDER_BUF_TIMEOUT))
1203	goto set_release_timer;
1204
1205	/* don't leave incomplete A-MSDUs around */
1206	for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1207	i = (i + 1) % tid_agg_rx->buf_size)
1208	__skb_queue_purge(list: &tid_agg_rx->reorder_buf[i]);
1209
1210	ht_dbg_ratelimited(sdata,
1211	"release an RX reorder frame due to timeout on earlier frames\n");
1212	ieee80211_release_reorder_frame(sdata, tid_agg_rx, index: j,
1213	frames);
1214
1215	/*
1216	* Increment the head seq# also for the skipped slots.
1217	*/
1218	tid_agg_rx->head_seq_num =
1219	(tid_agg_rx->head_seq_num +
1220	skipped) & IEEE80211_SN_MASK;
1221	skipped = 0;
1222	}
1223	} else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1224	ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1225	frames);
1226	index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1227	}
1228
1229	if (tid_agg_rx->stored_mpdu_num) {
1230	j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1231
1232	for (; j != (index - 1) % tid_agg_rx->buf_size;
1233	j = (j + 1) % tid_agg_rx->buf_size) {
1234	if (ieee80211_rx_reorder_ready(tid_agg_rx, index: j))
1235	break;
1236	}
1237
1238	set_release_timer:
1239
1240	if (!tid_agg_rx->removed)
1241	mod_timer(timer: &tid_agg_rx->reorder_timer,
1242	expires: tid_agg_rx->reorder_time[j] + 1 +
1243	HT_RX_REORDER_BUF_TIMEOUT);
1244	} else {
1245	timer_delete(timer: &tid_agg_rx->reorder_timer);
1246	}
1247	}
1248
1249	/*
1250	* As this function belongs to the RX path it must be under
1251	* rcu_read_lock protection. It returns false if the frame
1252	* can be processed immediately, true if it was consumed.
1253	*/
1254	static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1255	struct tid_ampdu_rx *tid_agg_rx,
1256	struct sk_buff *skb,
1257	struct sk_buff_head *frames)
1258	{
1259	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1260	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1261	u16 mpdu_seq_num = ieee80211_get_sn(hdr);
1262	u16 head_seq_num, buf_size;
1263	int index;
1264	bool ret = true;
1265
1266	spin_lock(lock: &tid_agg_rx->reorder_lock);
1267
1268	/*
1269	* Offloaded BA sessions have no known starting sequence number so pick
1270	* one from first Rxed frame for this tid after BA was started.
1271	*/
1272	if (unlikely(tid_agg_rx->auto_seq)) {
1273	tid_agg_rx->auto_seq = false;
1274	tid_agg_rx->ssn = mpdu_seq_num;
1275	tid_agg_rx->head_seq_num = mpdu_seq_num;
1276	}
1277
1278	buf_size = tid_agg_rx->buf_size;
1279	head_seq_num = tid_agg_rx->head_seq_num;
1280
1281	/*
1282	* If the current MPDU's SN is smaller than the SSN, it shouldn't
1283	* be reordered.
1284	*/
1285	if (unlikely(!tid_agg_rx->started)) {
1286	if (ieee80211_sn_less(sn1: mpdu_seq_num, sn2: head_seq_num)) {
1287	ret = false;
1288	goto out;
1289	}
1290	tid_agg_rx->started = true;
1291	}
1292
1293	/* frame with out of date sequence number */
1294	if (ieee80211_sn_less(sn1: mpdu_seq_num, sn2: head_seq_num)) {
1295	dev_kfree_skb(skb);
1296	goto out;
1297	}
1298
1299	/*
1300	* If frame the sequence number exceeds our buffering window
1301	* size release some previous frames to make room for this one.
1302	*/
1303	if (!ieee80211_sn_less(sn1: mpdu_seq_num, sn2: head_seq_num + buf_size)) {
1304	head_seq_num = ieee80211_sn_inc(
1305	sn: ieee80211_sn_sub(sn1: mpdu_seq_num, sn2: buf_size));
1306	/* release stored frames up to new head to stack */
1307	ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1308	head_seq_num, frames);
1309	}
1310
1311	/* Now the new frame is always in the range of the reordering buffer */
1312
1313	index = mpdu_seq_num % tid_agg_rx->buf_size;
1314
1315	/* check if we already stored this frame */
1316	if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1317	dev_kfree_skb(skb);
1318	goto out;
1319	}
1320
1321	/*
1322	* If the current MPDU is in the right order and nothing else
1323	* is stored we can process it directly, no need to buffer it.
1324	* If it is first but there's something stored, we may be able
1325	* to release frames after this one.
1326	*/
1327	if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1328	tid_agg_rx->stored_mpdu_num == 0) {
1329	if (!(status->flag & RX_FLAG_AMSDU_MORE))
1330	tid_agg_rx->head_seq_num =
1331	ieee80211_sn_inc(sn: tid_agg_rx->head_seq_num);
1332	ret = false;
1333	goto out;
1334	}
1335
1336	/* put the frame in the reordering buffer */
1337	__skb_queue_tail(list: &tid_agg_rx->reorder_buf[index], newsk: skb);
1338	if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1339	tid_agg_rx->reorder_time[index] = jiffies;
1340	tid_agg_rx->stored_mpdu_num++;
1341	ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1342	}
1343
1344	out:
1345	spin_unlock(lock: &tid_agg_rx->reorder_lock);
1346	return ret;
1347	}
1348
1349	/*
1350	* Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1351	* true if the MPDU was buffered, false if it should be processed.
1352	*/
1353	static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1354	struct sk_buff_head *frames)
1355	{
1356	struct sk_buff *skb = rx->skb;
1357	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1358	struct sta_info *sta = rx->sta;
1359	struct tid_ampdu_rx *tid_agg_rx;
1360	u16 sc;
1361	u8 tid, ack_policy;
1362
1363	if (!ieee80211_is_data_qos(fc: hdr->frame_control) ||
1364	is_multicast_ether_addr(addr: hdr->addr1))
1365	goto dont_reorder;
1366
1367	/*
1368	* filter the QoS data rx stream according to
1369	* STA/TID and check if this STA/TID is on aggregation
1370	*/
1371
1372	if (!sta)
1373	goto dont_reorder;
1374
1375	ack_policy = *ieee80211_get_qos_ctl(hdr) &
1376	IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1377	tid = ieee80211_get_tid(hdr);
1378
1379	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1380	if (!tid_agg_rx) {
1381	if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1382	!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1383	!test_and_set_bit(nr: tid, addr: rx->sta->ampdu_mlme.unexpected_agg))
1384	ieee80211_send_delba(sdata: rx->sdata, da: rx->sta->sta.addr, tid,
1385	initiator: WLAN_BACK_RECIPIENT,
1386	reason_code: WLAN_REASON_QSTA_REQUIRE_SETUP);
1387	goto dont_reorder;
1388	}
1389
1390	/* qos null data frames are excluded */
1391	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1392	goto dont_reorder;
1393
1394	/* not part of a BA session */
1395	if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
1396	goto dont_reorder;
1397
1398	/* new, potentially un-ordered, ampdu frame - process it */
1399
1400	/* reset session timer */
1401	if (tid_agg_rx->timeout)
1402	tid_agg_rx->last_rx = jiffies;
1403
1404	/* if this mpdu is fragmented - terminate rx aggregation session */
1405	sc = le16_to_cpu(hdr->seq_ctrl);
1406	if (sc & IEEE80211_SCTL_FRAG) {
1407	ieee80211_queue_skb_to_iface(sdata: rx->sdata, link_id: rx->link_id, NULL, skb);
1408	return;
1409	}
1410
1411	/*
1412	* No locking needed -- we will only ever process one
1413	* RX packet at a time, and thus own tid_agg_rx. All
1414	* other code manipulating it needs to (and does) make
1415	* sure that we cannot get to it any more before doing
1416	* anything with it.
1417	*/
1418	if (ieee80211_sta_manage_reorder_buf(sdata: rx->sdata, tid_agg_rx, skb,
1419	frames))
1420	return;
1421
1422	dont_reorder:
1423	__skb_queue_tail(list: frames, newsk: skb);
1424	}
1425
1426	static ieee80211_rx_result debug_noinline
1427	ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1428	{
1429	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1430	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
1431
1432	if (status->flag & RX_FLAG_DUP_VALIDATED)
1433	return RX_CONTINUE;
1434
1435	/*
1436	* Drop duplicate 802.11 retransmissions
1437	* (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1438	*/
1439
1440	if (rx->skb->len < 24)
1441	return RX_CONTINUE;
1442
1443	if (ieee80211_is_ctl(fc: hdr->frame_control) ||
1444	ieee80211_is_any_nullfunc(fc: hdr->frame_control))
1445	return RX_CONTINUE;
1446
1447	if (!rx->sta)
1448	return RX_CONTINUE;
1449
1450	if (unlikely(is_multicast_ether_addr(hdr->addr1))) {
1451	struct ieee80211_sub_if_data *sdata = rx->sdata;
1452	u16 sn = ieee80211_get_sn(hdr);
1453
1454	if (!ieee80211_is_data_present(fc: hdr->frame_control))
1455	return RX_CONTINUE;
1456
1457	if (!ieee80211_vif_is_mld(vif: &sdata->vif) ||
1458	sdata->vif.type != NL80211_IFTYPE_STATION)
1459	return RX_CONTINUE;
1460
1461	if (sdata->u.mgd.mcast_seq_last != IEEE80211_SN_MODULO &&
1462	ieee80211_sn_less_eq(sn1: sn, sn2: sdata->u.mgd.mcast_seq_last))
1463	return RX_DROP_U_DUP;
1464
1465	sdata->u.mgd.mcast_seq_last = sn;
1466	return RX_CONTINUE;
1467	}
1468
1469	if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1470	rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1471	I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1472	rx->link_sta->rx_stats.num_duplicates++;
1473	return RX_DROP_U_DUP;
1474	} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1475	rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1476	}
1477
1478	return RX_CONTINUE;
1479	}
1480
1481	static ieee80211_rx_result debug_noinline
1482	ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1483	{
1484	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1485
1486	/* Drop disallowed frame classes based on STA auth/assoc state;
1487	* IEEE 802.11, Chap 5.5.
1488	*
1489	* mac80211 filters only based on association state, i.e. it drops
1490	* Class 3 frames from not associated stations. hostapd sends
1491	* deauth/disassoc frames when needed. In addition, hostapd is
1492	* responsible for filtering on both auth and assoc states.
1493	*/
1494
1495	if (ieee80211_vif_is_mesh(vif: &rx->sdata->vif))
1496	return ieee80211_rx_mesh_check(rx);
1497
1498	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1499	ieee80211_is_pspoll(hdr->frame_control)) &&
1500	rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1501	rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1502	(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1503	/*
1504	* accept port control frames from the AP even when it's not
1505	* yet marked ASSOC to prevent a race where we don't set the
1506	* assoc bit quickly enough before it sends the first frame
1507	*/
1508	if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1509	ieee80211_is_data_present(fc: hdr->frame_control)) {
1510	unsigned int hdrlen;
1511	__be16 ethertype;
1512
1513	hdrlen = ieee80211_hdrlen(fc: hdr->frame_control);
1514
1515	if (rx->skb->len < hdrlen + 8)
1516	return RX_DROP;
1517
1518	skb_copy_bits(skb: rx->skb, offset: hdrlen + 6, to: &ethertype, len: 2);
1519	if (ethertype == rx->sdata->control_port_protocol)
1520	return RX_CONTINUE;
1521	}
1522
1523	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1524	cfg80211_rx_spurious_frame(dev: rx->sdata->dev,
1525	addr: hdr->addr2,
1526	GFP_ATOMIC))
1527	return RX_DROP_U_SPURIOUS;
1528
1529	return RX_DROP;
1530	}
1531
1532	return RX_CONTINUE;
1533	}
1534
1535
1536	static ieee80211_rx_result debug_noinline
1537	ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1538	{
1539	struct ieee80211_local *local;
1540	struct ieee80211_hdr *hdr;
1541	struct sk_buff *skb;
1542
1543	local = rx->local;
1544	skb = rx->skb;
1545	hdr = (struct ieee80211_hdr *) skb->data;
1546
1547	if (!local->pspolling)
1548	return RX_CONTINUE;
1549
1550	if (!ieee80211_has_fromds(fc: hdr->frame_control))
1551	/* this is not from AP */
1552	return RX_CONTINUE;
1553
1554	if (!ieee80211_is_data(fc: hdr->frame_control))
1555	return RX_CONTINUE;
1556
1557	if (!ieee80211_has_moredata(fc: hdr->frame_control)) {
1558	/* AP has no more frames buffered for us */
1559	local->pspolling = false;
1560	return RX_CONTINUE;
1561	}
1562
1563	/* more data bit is set, let's request a new frame from the AP */
1564	ieee80211_send_pspoll(local, sdata: rx->sdata);
1565
1566	return RX_CONTINUE;
1567	}
1568
1569	static void sta_ps_start(struct sta_info *sta)
1570	{
1571	struct ieee80211_sub_if_data *sdata = sta->sdata;
1572	struct ieee80211_local *local = sdata->local;
1573	struct ps_data *ps;
1574	int tid;
1575
1576	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1577	sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1578	ps = &sdata->bss->ps;
1579	else
1580	return;
1581
1582	atomic_inc(v: &ps->num_sta_ps);
1583	set_sta_flag(sta, flag: WLAN_STA_PS_STA);
1584	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1585	drv_sta_notify(local, sdata, cmd: STA_NOTIFY_SLEEP, sta: &sta->sta);
1586	ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1587	sta->sta.addr, sta->sta.aid);
1588
1589	ieee80211_clear_fast_xmit(sta);
1590
1591	for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1592	struct ieee80211_txq *txq = sta->sta.txq[tid];
1593	struct txq_info *txqi = to_txq_info(txq);
1594
1595	spin_lock(lock: &local->active_txq_lock[txq->ac]);
1596	if (!list_empty(head: &txqi->schedule_order))
1597	list_del_init(entry: &txqi->schedule_order);
1598	spin_unlock(lock: &local->active_txq_lock[txq->ac]);
1599
1600	if (txq_has_queue(txq))
1601	set_bit(nr: tid, addr: &sta->txq_buffered_tids);
1602	else
1603	clear_bit(nr: tid, addr: &sta->txq_buffered_tids);
1604	}
1605	}
1606
1607	static void sta_ps_end(struct sta_info *sta)
1608	{
1609	ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1610	sta->sta.addr, sta->sta.aid);
1611
1612	if (test_sta_flag(sta, flag: WLAN_STA_PS_DRIVER)) {
1613	/*
1614	* Clear the flag only if the other one is still set
1615	* so that the TX path won't start TX'ing new frames
1616	* directly ... In the case that the driver flag isn't
1617	* set ieee80211_sta_ps_deliver_wakeup() will clear it.
1618	*/
1619	clear_sta_flag(sta, flag: WLAN_STA_PS_STA);
1620	ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1621	sta->sta.addr, sta->sta.aid);
1622	return;
1623	}
1624
1625	set_sta_flag(sta, flag: WLAN_STA_PS_DELIVER);
1626	clear_sta_flag(sta, flag: WLAN_STA_PS_STA);
1627	ieee80211_sta_ps_deliver_wakeup(sta);
1628	}
1629
1630	int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1631	{
1632	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1633	bool in_ps;
1634
1635	WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1636
1637	/* Don't let the same PS state be set twice */
1638	in_ps = test_sta_flag(sta, flag: WLAN_STA_PS_STA);
1639	if ((start && in_ps) || (!start && !in_ps))
1640	return -EINVAL;
1641
1642	if (start)
1643	sta_ps_start(sta);
1644	else
1645	sta_ps_end(sta);
1646
1647	return 0;
1648	}
1649	EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1650
1651	void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1652	{
1653	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1654
1655	if (test_sta_flag(sta, flag: WLAN_STA_SP))
1656	return;
1657
1658	if (!test_sta_flag(sta, flag: WLAN_STA_PS_DRIVER))
1659	ieee80211_sta_ps_deliver_poll_response(sta);
1660	else
1661	set_sta_flag(sta, flag: WLAN_STA_PSPOLL);
1662	}
1663	EXPORT_SYMBOL(ieee80211_sta_pspoll);
1664
1665	void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1666	{
1667	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1668	int ac = ieee80211_ac_from_tid(tid);
1669
1670	/*
1671	* If this AC is not trigger-enabled do nothing unless the
1672	* driver is calling us after it already checked.
1673	*
1674	* NB: This could/should check a separate bitmap of trigger-
1675	* enabled queues, but for now we only implement uAPSD w/o
1676	* TSPEC changes to the ACs, so they're always the same.
1677	*/
1678	if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1679	tid != IEEE80211_NUM_TIDS)
1680	return;
1681
1682	/* if we are in a service period, do nothing */
1683	if (test_sta_flag(sta, flag: WLAN_STA_SP))
1684	return;
1685
1686	if (!test_sta_flag(sta, flag: WLAN_STA_PS_DRIVER))
1687	ieee80211_sta_ps_deliver_uapsd(sta);
1688	else
1689	set_sta_flag(sta, flag: WLAN_STA_UAPSD);
1690	}
1691	EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1692
1693	static ieee80211_rx_result debug_noinline
1694	ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1695	{
1696	struct ieee80211_sub_if_data *sdata = rx->sdata;
1697	struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1698	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
1699
1700	if (!rx->sta)
1701	return RX_CONTINUE;
1702
1703	if (sdata->vif.type != NL80211_IFTYPE_AP &&
1704	sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1705	return RX_CONTINUE;
1706
1707	/*
1708	* The device handles station powersave, so don't do anything about
1709	* uAPSD and PS-Poll frames (the latter shouldn't even come up from
1710	* it to mac80211 since they're handled.)
1711	*/
1712	if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1713	return RX_CONTINUE;
1714
1715	/*
1716	* Don't do anything if the station isn't already asleep. In
1717	* the uAPSD case, the station will probably be marked asleep,
1718	* in the PS-Poll case the station must be confused ...
1719	*/
1720	if (!test_sta_flag(sta: rx->sta, flag: WLAN_STA_PS_STA))
1721	return RX_CONTINUE;
1722
1723	if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1724	ieee80211_sta_pspoll(&rx->sta->sta);
1725
1726	/* Free PS Poll skb here instead of returning RX_DROP that would
1727	* count as an dropped frame. */
1728	dev_kfree_skb(rx->skb);
1729
1730	return RX_QUEUED;
1731	} else if (!ieee80211_has_morefrags(fc: hdr->frame_control) &&
1732	!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1733	ieee80211_has_pm(fc: hdr->frame_control) &&
1734	(ieee80211_is_data_qos(fc: hdr->frame_control) ||
1735	ieee80211_is_qos_nullfunc(fc: hdr->frame_control))) {
1736	u8 tid = ieee80211_get_tid(hdr);
1737
1738	ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1739	}
1740
1741	return RX_CONTINUE;
1742	}
1743
1744	static ieee80211_rx_result debug_noinline
1745	ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1746	{
1747	struct sta_info *sta = rx->sta;
1748	struct link_sta_info *link_sta = rx->link_sta;
1749	struct sk_buff *skb = rx->skb;
1750	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1751	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1752	int i;
1753
1754	if (!sta || !link_sta)
1755	return RX_CONTINUE;
1756
1757	/*
1758	* Update last_rx only for IBSS packets which are for the current
1759	* BSSID and for station already AUTHORIZED to avoid keeping the
1760	* current IBSS network alive in cases where other STAs start
1761	* using different BSSID. This will also give the station another
1762	* chance to restart the authentication/authorization in case
1763	* something went wrong the first time.
1764	*/
1765	if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1766	u8 *bssid = ieee80211_get_bssid(hdr, len: rx->skb->len,
1767	type: NL80211_IFTYPE_ADHOC);
1768	if (ether_addr_equal(addr1: bssid, addr2: rx->sdata->u.ibss.bssid) &&
1769	test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED)) {
1770	link_sta->rx_stats.last_rx = jiffies;
1771	if (ieee80211_is_data_present(fc: hdr->frame_control) &&
1772	!is_multicast_ether_addr(addr: hdr->addr1))
1773	link_sta->rx_stats.last_rate =
1774	sta_stats_encode_rate(s: status);
1775	}
1776	} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1777	link_sta->rx_stats.last_rx = jiffies;
1778	} else if (!ieee80211_is_s1g_beacon(fc: hdr->frame_control) &&
1779	!is_multicast_ether_addr(addr: hdr->addr1)) {
1780	/*
1781	* Mesh beacons will update last_rx when if they are found to
1782	* match the current local configuration when processed.
1783	*/
1784	link_sta->rx_stats.last_rx = jiffies;
1785	if (ieee80211_is_data_present(fc: hdr->frame_control))
1786	link_sta->rx_stats.last_rate = sta_stats_encode_rate(s: status);
1787	}
1788
1789	link_sta->rx_stats.fragments++;
1790
1791	u64_stats_update_begin(syncp: &link_sta->rx_stats.syncp);
1792	link_sta->rx_stats.bytes += rx->skb->len;
1793	u64_stats_update_end(syncp: &link_sta->rx_stats.syncp);
1794
1795	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1796	link_sta->rx_stats.last_signal = status->signal;
1797	ewma_signal_add(e: &link_sta->rx_stats_avg.signal,
1798	val: -status->signal);
1799	}
1800
1801	if (status->chains) {
1802	link_sta->rx_stats.chains = status->chains;
1803	for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1804	int signal = status->chain_signal[i];
1805
1806	if (!(status->chains & BIT(i)))
1807	continue;
1808
1809	link_sta->rx_stats.chain_signal_last[i] = signal;
1810	ewma_signal_add(e: &link_sta->rx_stats_avg.chain_signal[i],
1811	val: -signal);
1812	}
1813	}
1814
1815	if (ieee80211_is_s1g_beacon(fc: hdr->frame_control))
1816	return RX_CONTINUE;
1817
1818	/*
1819	* Change STA power saving mode only at the end of a frame
1820	* exchange sequence, and only for a data or management
1821	* frame as specified in IEEE 802.11-2016 11.2.3.2
1822	*/
1823	if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1824	!ieee80211_has_morefrags(fc: hdr->frame_control) &&
1825	!is_multicast_ether_addr(addr: hdr->addr1) &&
1826	(ieee80211_is_mgmt(fc: hdr->frame_control) ||
1827	ieee80211_is_data(fc: hdr->frame_control)) &&
1828	!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1829	(rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1830	rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1831	if (test_sta_flag(sta, flag: WLAN_STA_PS_STA)) {
1832	if (!ieee80211_has_pm(fc: hdr->frame_control))
1833	sta_ps_end(sta);
1834	} else {
1835	if (ieee80211_has_pm(fc: hdr->frame_control))
1836	sta_ps_start(sta);
1837	}
1838	}
1839
1840	/* mesh power save support */
1841	if (ieee80211_vif_is_mesh(vif: &rx->sdata->vif))
1842	ieee80211_mps_rx_h_sta_process(sta, hdr);
1843
1844	/*
1845	* Drop (qos-)data::nullfunc frames silently, since they
1846	* are used only to control station power saving mode.
1847	*/
1848	if (ieee80211_is_any_nullfunc(fc: hdr->frame_control)) {
1849	I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1850
1851	/*
1852	* If we receive a 4-addr nullfunc frame from a STA
1853	* that was not moved to a 4-addr STA vlan yet send
1854	* the event to userspace and for older hostapd drop
1855	* the frame to the monitor interface.
1856	*/
1857	if (ieee80211_has_a4(fc: hdr->frame_control) &&
1858	(rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1859	(rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1860	!rx->sdata->u.vlan.sta))) {
1861	if (!test_and_set_sta_flag(sta, flag: WLAN_STA_4ADDR_EVENT))
1862	cfg80211_rx_unexpected_4addr_frame(
1863	dev: rx->sdata->dev, addr: sta->sta.addr,
1864	GFP_ATOMIC);
1865	return RX_DROP_U_UNEXPECTED_4ADDR_FRAME;
1866	}
1867	/*
1868	* Update counter and free packet here to avoid
1869	* counting this as a dropped packed.
1870	*/
1871	link_sta->rx_stats.packets++;
1872	dev_kfree_skb(rx->skb);
1873	return RX_QUEUED;
1874	}
1875
1876	return RX_CONTINUE;
1877	} /* ieee80211_rx_h_sta_process */
1878
1879	static struct ieee80211_key *
1880	ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
1881	{
1882	struct ieee80211_key *key = NULL;
1883	int idx2;
1884
1885	/* Make sure key gets set if either BIGTK key index is set so that
1886	* ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
1887	* Beacon frames and Beacon frames that claim to use another BIGTK key
1888	* index (i.e., a key that we do not have).
1889	*/
1890
1891	if (idx < 0) {
1892	idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
1893	idx2 = idx + 1;
1894	} else {
1895	if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1896	idx2 = idx + 1;
1897	else
1898	idx2 = idx - 1;
1899	}
1900
1901	if (rx->link_sta)
1902	key = rcu_dereference(rx->link_sta->gtk[idx]);
1903	if (!key)
1904	key = rcu_dereference(rx->link->gtk[idx]);
1905	if (!key && rx->link_sta)
1906	key = rcu_dereference(rx->link_sta->gtk[idx2]);
1907	if (!key)
1908	key = rcu_dereference(rx->link->gtk[idx2]);
1909
1910	return key;
1911	}
1912
1913	static ieee80211_rx_result debug_noinline
1914	ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1915	{
1916	struct sk_buff *skb = rx->skb;
1917	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1918	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1919	int keyidx;
1920	ieee80211_rx_result result = RX_DROP_U_DECRYPT_FAIL;
1921	struct ieee80211_key *sta_ptk = NULL;
1922	struct ieee80211_key *ptk_idx = NULL;
1923	int mmie_keyidx = -1;
1924	__le16 fc;
1925
1926	if (ieee80211_is_ext(fc: hdr->frame_control))
1927	return RX_CONTINUE;
1928
1929	/*
1930	* Key selection 101
1931	*
1932	* There are five types of keys:
1933	* - GTK (group keys)
1934	* - IGTK (group keys for management frames)
1935	* - BIGTK (group keys for Beacon frames)
1936	* - PTK (pairwise keys)
1937	* - STK (station-to-station pairwise keys)
1938	*
1939	* When selecting a key, we have to distinguish between multicast
1940	* (including broadcast) and unicast frames, the latter can only
1941	* use PTKs and STKs while the former always use GTKs, IGTKs, and
1942	* BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
1943	* then unicast frames can also use key indices like GTKs. Hence, if we
1944	* don't have a PTK/STK we check the key index for a WEP key.
1945	*
1946	* Note that in a regular BSS, multicast frames are sent by the
1947	* AP only, associated stations unicast the frame to the AP first
1948	* which then multicasts it on their behalf.
1949	*
1950	* There is also a slight problem in IBSS mode: GTKs are negotiated
1951	* with each station, that is something we don't currently handle.
1952	* The spec seems to expect that one negotiates the same key with
1953	* every station but there's no such requirement; VLANs could be
1954	* possible.
1955	*/
1956
1957	/* start without a key */
1958	rx->key = NULL;
1959	fc = hdr->frame_control;
1960
1961	if (rx->sta) {
1962	int keyid = rx->sta->ptk_idx;
1963	sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1964
1965	if (ieee80211_has_protected(fc) &&
1966	!(status->flag & RX_FLAG_IV_STRIPPED)) {
1967	keyid = ieee80211_get_keyid(skb: rx->skb);
1968
1969	if (unlikely(keyid < 0))
1970	return RX_DROP_U_NO_KEY_ID;
1971
1972	ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1973	}
1974	}
1975
1976	if (!ieee80211_has_protected(fc))
1977	mmie_keyidx = ieee80211_get_mmie_keyidx(skb: rx->skb);
1978
1979	if (!is_multicast_ether_addr(addr: hdr->addr1) && sta_ptk) {
1980	rx->key = ptk_idx ? ptk_idx : sta_ptk;
1981	if ((status->flag & RX_FLAG_DECRYPTED) &&
1982	(status->flag & RX_FLAG_IV_STRIPPED))
1983	return RX_CONTINUE;
1984	/* Skip decryption if the frame is not protected. */
1985	if (!ieee80211_has_protected(fc))
1986	return RX_CONTINUE;
1987	} else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
1988	/* Broadcast/multicast robust management frame / BIP */
1989	if ((status->flag & RX_FLAG_DECRYPTED) &&
1990	(status->flag & RX_FLAG_IV_STRIPPED))
1991	return RX_CONTINUE;
1992
1993	if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
1994	mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1995	NUM_DEFAULT_BEACON_KEYS) {
1996	if (rx->sdata->dev)
1997	cfg80211_rx_unprot_mlme_mgmt(dev: rx->sdata->dev,
1998	buf: skb->data,
1999	len: skb->len);
2000	return RX_DROP_U_BAD_BCN_KEYIDX;
2001	}
2002
2003	rx->key = ieee80211_rx_get_bigtk(rx, idx: mmie_keyidx);
2004	if (!rx->key)
2005	return RX_CONTINUE; /* Beacon protection not in use */
2006	} else if (mmie_keyidx >= 0) {
2007	/* Broadcast/multicast robust management frame / BIP */
2008	if ((status->flag & RX_FLAG_DECRYPTED) &&
2009	(status->flag & RX_FLAG_IV_STRIPPED))
2010	return RX_CONTINUE;
2011
2012	if (mmie_keyidx < NUM_DEFAULT_KEYS ||
2013	mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
2014	return RX_DROP_U_BAD_MGMT_KEYIDX; /* unexpected BIP keyidx */
2015	if (rx->link_sta) {
2016	if (ieee80211_is_group_privacy_action(skb) &&
2017	test_sta_flag(sta: rx->sta, flag: WLAN_STA_MFP))
2018	return RX_DROP;
2019
2020	rx->key = rcu_dereference(rx->link_sta->gtk[mmie_keyidx]);
2021	}
2022	if (!rx->key)
2023	rx->key = rcu_dereference(rx->link->gtk[mmie_keyidx]);
2024	} else if (!ieee80211_has_protected(fc)) {
2025	/*
2026	* The frame was not protected, so skip decryption. However, we
2027	* need to set rx->key if there is a key that could have been
2028	* used so that the frame may be dropped if encryption would
2029	* have been expected.
2030	*/
2031	struct ieee80211_key *key = NULL;
2032	int i;
2033
2034	if (ieee80211_is_beacon(fc)) {
2035	key = ieee80211_rx_get_bigtk(rx, idx: -1);
2036	} else if (ieee80211_is_mgmt(fc) &&
2037	is_multicast_ether_addr(addr: hdr->addr1)) {
2038	key = rcu_dereference(rx->link->default_mgmt_key);
2039	} else {
2040	if (rx->link_sta) {
2041	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2042	key = rcu_dereference(rx->link_sta->gtk[i]);
2043	if (key)
2044	break;
2045	}
2046	}
2047	if (!key) {
2048	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
2049	key = rcu_dereference(rx->link->gtk[i]);
2050	if (key)
2051	break;
2052	}
2053	}
2054	}
2055	if (key)
2056	rx->key = key;
2057	return RX_CONTINUE;
2058	} else {
2059	/*
2060	* The device doesn't give us the IV so we won't be
2061	* able to look up the key. That's ok though, we
2062	* don't need to decrypt the frame, we just won't
2063	* be able to keep statistics accurate.
2064	* Except for key threshold notifications, should
2065	* we somehow allow the driver to tell us which key
2066	* the hardware used if this flag is set?
2067	*/
2068	if ((status->flag & RX_FLAG_DECRYPTED) &&
2069	(status->flag & RX_FLAG_IV_STRIPPED))
2070	return RX_CONTINUE;
2071
2072	keyidx = ieee80211_get_keyid(skb: rx->skb);
2073
2074	if (unlikely(keyidx < 0))
2075	return RX_DROP_U_NO_KEY_ID;
2076
2077	/* check per-station GTK first, if multicast packet */
2078	if (is_multicast_ether_addr(addr: hdr->addr1) && rx->link_sta)
2079	rx->key = rcu_dereference(rx->link_sta->gtk[keyidx]);
2080
2081	/* if not found, try default key */
2082	if (!rx->key) {
2083	if (is_multicast_ether_addr(addr: hdr->addr1))
2084	rx->key = rcu_dereference(rx->link->gtk[keyidx]);
2085	if (!rx->key)
2086	rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2087
2088	/*
2089	* RSNA-protected unicast frames should always be
2090	* sent with pairwise or station-to-station keys,
2091	* but for WEP we allow using a key index as well.
2092	*/
2093	if (rx->key &&
2094	rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2095	rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2096	!is_multicast_ether_addr(addr: hdr->addr1))
2097	rx->key = NULL;
2098	}
2099	}
2100
2101	if (rx->key) {
2102	if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2103	return RX_DROP;
2104
2105	/* TODO: add threshold stuff again */
2106	} else {
2107	return RX_DROP;
2108	}
2109
2110	switch (rx->key->conf.cipher) {
2111	case WLAN_CIPHER_SUITE_WEP40:
2112	case WLAN_CIPHER_SUITE_WEP104:
2113	result = ieee80211_crypto_wep_decrypt(rx);
2114	break;
2115	case WLAN_CIPHER_SUITE_TKIP:
2116	result = ieee80211_crypto_tkip_decrypt(rx);
2117	break;
2118	case WLAN_CIPHER_SUITE_CCMP:
2119	result = ieee80211_crypto_ccmp_decrypt(
2120	rx, IEEE80211_CCMP_MIC_LEN);
2121	break;
2122	case WLAN_CIPHER_SUITE_CCMP_256:
2123	result = ieee80211_crypto_ccmp_decrypt(
2124	rx, IEEE80211_CCMP_256_MIC_LEN);
2125	break;
2126	case WLAN_CIPHER_SUITE_AES_CMAC:
2127	result = ieee80211_crypto_aes_cmac_decrypt(rx);
2128	break;
2129	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2130	result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2131	break;
2132	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2133	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2134	result = ieee80211_crypto_aes_gmac_decrypt(rx);
2135	break;
2136	case WLAN_CIPHER_SUITE_GCMP:
2137	case WLAN_CIPHER_SUITE_GCMP_256:
2138	result = ieee80211_crypto_gcmp_decrypt(rx);
2139	break;
2140	default:
2141	result = RX_DROP_U_BAD_CIPHER;
2142	}
2143
2144	/* the hdr variable is invalid after the decrypt handlers */
2145
2146	/* either the frame has been decrypted or will be dropped */
2147	status->flag |= RX_FLAG_DECRYPTED;
2148
2149	if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
2150	rx->sdata->dev))
2151	cfg80211_rx_unprot_mlme_mgmt(dev: rx->sdata->dev,
2152	buf: skb->data, len: skb->len);
2153
2154	return result;
2155	}
2156
2157	void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache)
2158	{
2159	int i;
2160
2161	for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2162	skb_queue_head_init(list: &cache->entries[i].skb_list);
2163	}
2164
2165	void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache)
2166	{
2167	int i;
2168
2169	for (i = 0; i < ARRAY_SIZE(cache->entries); i++)
2170	__skb_queue_purge(list: &cache->entries[i].skb_list);
2171	}
2172
2173	static inline struct ieee80211_fragment_entry *
2174	ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache,
2175	unsigned int frag, unsigned int seq, int rx_queue,
2176	struct sk_buff **skb)
2177	{
2178	struct ieee80211_fragment_entry *entry;
2179
2180	entry = &cache->entries[cache->next++];
2181	if (cache->next >= IEEE80211_FRAGMENT_MAX)
2182	cache->next = 0;
2183
2184	__skb_queue_purge(list: &entry->skb_list);
2185
2186	__skb_queue_tail(list: &entry->skb_list, newsk: *skb); /* no need for locking */
2187	*skb = NULL;
2188	entry->first_frag_time = jiffies;
2189	entry->seq = seq;
2190	entry->rx_queue = rx_queue;
2191	entry->last_frag = frag;
2192	entry->check_sequential_pn = false;
2193	entry->extra_len = 0;
2194
2195	return entry;
2196	}
2197
2198	static inline struct ieee80211_fragment_entry *
2199	ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache,
2200	unsigned int frag, unsigned int seq,
2201	int rx_queue, struct ieee80211_hdr *hdr)
2202	{
2203	struct ieee80211_fragment_entry *entry;
2204	int i, idx;
2205
2206	idx = cache->next;
2207	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2208	struct ieee80211_hdr *f_hdr;
2209	struct sk_buff *f_skb;
2210
2211	idx--;
2212	if (idx < 0)
2213	idx = IEEE80211_FRAGMENT_MAX - 1;
2214
2215	entry = &cache->entries[idx];
2216	if (skb_queue_empty(list: &entry->skb_list) || entry->seq != seq ||
2217	entry->rx_queue != rx_queue ||
2218	entry->last_frag + 1 != frag)
2219	continue;
2220
2221	f_skb = __skb_peek(list_: &entry->skb_list);
2222	f_hdr = (struct ieee80211_hdr *) f_skb->data;
2223
2224	/*
2225	* Check ftype and addresses are equal, else check next fragment
2226	*/
2227	if (((hdr->frame_control ^ f_hdr->frame_control) &
2228	cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2229	!ether_addr_equal(addr1: hdr->addr1, addr2: f_hdr->addr1) ||
2230	!ether_addr_equal(addr1: hdr->addr2, addr2: f_hdr->addr2))
2231	continue;
2232
2233	if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2234	__skb_queue_purge(list: &entry->skb_list);
2235	continue;
2236	}
2237	return entry;
2238	}
2239
2240	return NULL;
2241	}
2242
2243	static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc)
2244	{
2245	return rx->key &&
2246	(rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2247	rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2248	rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2249	rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2250	ieee80211_has_protected(fc);
2251	}
2252
2253	static ieee80211_rx_result debug_noinline
2254	ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2255	{
2256	struct ieee80211_fragment_cache *cache = &rx->sdata->frags;
2257	struct ieee80211_hdr *hdr;
2258	u16 sc;
2259	__le16 fc;
2260	unsigned int frag, seq;
2261	struct ieee80211_fragment_entry *entry;
2262	struct sk_buff *skb;
2263	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
2264
2265	hdr = (struct ieee80211_hdr *)rx->skb->data;
2266	fc = hdr->frame_control;
2267
2268	if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc))
2269	return RX_CONTINUE;
2270
2271	sc = le16_to_cpu(hdr->seq_ctrl);
2272	frag = sc & IEEE80211_SCTL_FRAG;
2273
2274	if (rx->sta)
2275	cache = &rx->sta->frags;
2276
2277	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2278	goto out;
2279
2280	if (is_multicast_ether_addr(addr: hdr->addr1))
2281	return RX_DROP;
2282
2283	I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2284
2285	if (skb_linearize(skb: rx->skb))
2286	return RX_DROP_U_OOM;
2287
2288	/*
2289	* skb_linearize() might change the skb->data and
2290	* previously cached variables (in this case, hdr) need to
2291	* be refreshed with the new data.
2292	*/
2293	hdr = (struct ieee80211_hdr *)rx->skb->data;
2294	seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2295
2296	if (frag == 0) {
2297	/* This is the first fragment of a new frame. */
2298	entry = ieee80211_reassemble_add(cache, frag, seq,
2299	rx_queue: rx->seqno_idx, skb: &(rx->skb));
2300	if (requires_sequential_pn(rx, fc)) {
2301	int queue = rx->security_idx;
2302
2303	/* Store CCMP/GCMP PN so that we can verify that the
2304	* next fragment has a sequential PN value.
2305	*/
2306	entry->check_sequential_pn = true;
2307	entry->is_protected = true;
2308	entry->key_color = rx->key->color;
2309	memcpy(entry->last_pn,
2310	rx->key->u.ccmp.rx_pn[queue],
2311	IEEE80211_CCMP_PN_LEN);
2312	BUILD_BUG_ON(offsetof(struct ieee80211_key,
2313	u.ccmp.rx_pn) !=
2314	offsetof(struct ieee80211_key,
2315	u.gcmp.rx_pn));
2316	BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2317	sizeof(rx->key->u.gcmp.rx_pn[queue]));
2318	BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2319	IEEE80211_GCMP_PN_LEN);
2320	} else if (rx->key &&
2321	(ieee80211_has_protected(fc) ||
2322	(status->flag & RX_FLAG_DECRYPTED))) {
2323	entry->is_protected = true;
2324	entry->key_color = rx->key->color;
2325	}
2326	return RX_QUEUED;
2327	}
2328
2329	/* This is a fragment for a frame that should already be pending in
2330	* fragment cache. Add this fragment to the end of the pending entry.
2331	*/
2332	entry = ieee80211_reassemble_find(cache, frag, seq,
2333	rx_queue: rx->seqno_idx, hdr);
2334	if (!entry) {
2335	I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2336	return RX_DROP;
2337	}
2338
2339	/* "The receiver shall discard MSDUs and MMPDUs whose constituent
2340	* MPDU PN values are not incrementing in steps of 1."
2341	* see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2342	* and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2343	*/
2344	if (entry->check_sequential_pn) {
2345	int i;
2346	u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2347
2348	if (!requires_sequential_pn(rx, fc))
2349	return RX_DROP_U_NONSEQ_PN;
2350
2351	/* Prevent mixed key and fragment cache attacks */
2352	if (entry->key_color != rx->key->color)
2353	return RX_DROP_U_BAD_KEY_COLOR;
2354
2355	memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2356	for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2357	pn[i]++;
2358	if (pn[i])
2359	break;
2360	}
2361
2362	rpn = rx->ccm_gcm.pn;
2363	if (memcmp(p: pn, q: rpn, IEEE80211_CCMP_PN_LEN))
2364	return RX_DROP_U_REPLAY;
2365	memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2366	} else if (entry->is_protected &&
2367	(!rx->key ||
2368	(!ieee80211_has_protected(fc) &&
2369	!(status->flag & RX_FLAG_DECRYPTED)) ||
2370	rx->key->color != entry->key_color)) {
2371	/* Drop this as a mixed key or fragment cache attack, even
2372	* if for TKIP Michael MIC should protect us, and WEP is a
2373	* lost cause anyway.
2374	*/
2375	return RX_DROP_U_EXPECT_DEFRAG_PROT;
2376	} else if (entry->is_protected && rx->key &&
2377	entry->key_color != rx->key->color &&
2378	(status->flag & RX_FLAG_DECRYPTED)) {
2379	return RX_DROP_U_BAD_KEY_COLOR;
2380	}
2381
2382	skb_pull(skb: rx->skb, len: ieee80211_hdrlen(fc));
2383	__skb_queue_tail(list: &entry->skb_list, newsk: rx->skb);
2384	entry->last_frag = frag;
2385	entry->extra_len += rx->skb->len;
2386	if (ieee80211_has_morefrags(fc)) {
2387	rx->skb = NULL;
2388	return RX_QUEUED;
2389	}
2390
2391	rx->skb = __skb_dequeue(list: &entry->skb_list);
2392	if (skb_tailroom(skb: rx->skb) < entry->extra_len) {
2393	I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2394	if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2395	GFP_ATOMIC))) {
2396	I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2397	__skb_queue_purge(list: &entry->skb_list);
2398	return RX_DROP_U_OOM;
2399	}
2400	}
2401	while ((skb = __skb_dequeue(list: &entry->skb_list))) {
2402	skb_put_data(skb: rx->skb, data: skb->data, len: skb->len);
2403	dev_kfree_skb(skb);
2404	}
2405
2406	out:
2407	ieee80211_led_rx(local: rx->local);
2408	if (rx->sta)
2409	rx->link_sta->rx_stats.packets++;
2410	return RX_CONTINUE;
2411	}
2412
2413	static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2414	{
2415	if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2416	return -EACCES;
2417
2418	return 0;
2419	}
2420
2421	static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2422	{
2423	struct sk_buff *skb = rx->skb;
2424	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2425
2426	/*
2427	* Pass through unencrypted frames if the hardware has
2428	* decrypted them already.
2429	*/
2430	if (status->flag & RX_FLAG_DECRYPTED)
2431	return 0;
2432
2433	/* Drop unencrypted frames if key is set. */
2434	if (unlikely(!ieee80211_has_protected(fc) &&
2435	!ieee80211_is_any_nullfunc(fc) &&
2436	ieee80211_is_data(fc) && rx->key))
2437	return -EACCES;
2438
2439	return 0;
2440	}
2441
2442	VISIBLE_IF_MAC80211_KUNIT ieee80211_rx_result
2443	ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2444	{
2445	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
2446	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2447	__le16 fc = mgmt->frame_control;
2448
2449	/*
2450	* Pass through unencrypted frames if the hardware has
2451	* decrypted them already.
2452	*/
2453	if (status->flag & RX_FLAG_DECRYPTED)
2454	return RX_CONTINUE;
2455
2456	/* drop unicast protected dual (that wasn't protected) */
2457	if (ieee80211_is_action(fc) &&
2458	mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION)
2459	return RX_DROP_U_UNPROT_DUAL;
2460
2461	if (rx->sta && test_sta_flag(sta: rx->sta, flag: WLAN_STA_MFP)) {
2462	if (unlikely(!ieee80211_has_protected(fc) &&
2463	ieee80211_is_unicast_robust_mgmt_frame(rx->skb))) {
2464	if (ieee80211_is_deauth(fc) ||
2465	ieee80211_is_disassoc(fc)) {
2466	/*
2467	* Permit unprotected deauth/disassoc frames
2468	* during 4-way-HS (key is installed after HS).
2469	*/
2470	if (!rx->key)
2471	return RX_CONTINUE;
2472
2473	cfg80211_rx_unprot_mlme_mgmt(dev: rx->sdata->dev,
2474	buf: rx->skb->data,
2475	len: rx->skb->len);
2476	}
2477	return RX_DROP_U_UNPROT_UCAST_MGMT;
2478	}
2479	/* BIP does not use Protected field, so need to check MMIE */
2480	if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2481	ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2482	if (ieee80211_is_deauth(fc) ||
2483	ieee80211_is_disassoc(fc))
2484	cfg80211_rx_unprot_mlme_mgmt(dev: rx->sdata->dev,
2485	buf: rx->skb->data,
2486	len: rx->skb->len);
2487	return RX_DROP_U_UNPROT_MCAST_MGMT;
2488	}
2489	if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
2490	ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2491	cfg80211_rx_unprot_mlme_mgmt(dev: rx->sdata->dev,
2492	buf: rx->skb->data,
2493	len: rx->skb->len);
2494	return RX_DROP_U_UNPROT_BEACON;
2495	}
2496	/*
2497	* When using MFP, Action frames are not allowed prior to
2498	* having configured keys.
2499	*/
2500	if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2501	ieee80211_is_robust_mgmt_frame(rx->skb)))
2502	return RX_DROP_U_UNPROT_ACTION;
2503
2504	/* drop unicast public action frames when using MPF */
2505	if (is_unicast_ether_addr(addr: mgmt->da) &&
2506	ieee80211_is_protected_dual_of_public_action(skb: rx->skb))
2507	return RX_DROP_U_UNPROT_UNICAST_PUB_ACTION;
2508	}
2509
2510	/*
2511	* Drop robust action frames before assoc regardless of MFP state,
2512	* after assoc we also have decided on MFP or not.
2513	*/
2514	if (ieee80211_is_action(fc) &&
2515	ieee80211_is_robust_mgmt_frame(skb: rx->skb) &&
2516	(!rx->sta || !test_sta_flag(sta: rx->sta, flag: WLAN_STA_ASSOC)))
2517	return RX_DROP_U_UNPROT_ROBUST_ACTION;
2518
2519	return RX_CONTINUE;
2520	}
2521	EXPORT_SYMBOL_IF_MAC80211_KUNIT(ieee80211_drop_unencrypted_mgmt);
2522
2523	static ieee80211_rx_result
2524	__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2525	{
2526	struct ieee80211_sub_if_data *sdata = rx->sdata;
2527	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2528	bool check_port_control = false;
2529	struct ethhdr *ehdr;
2530	int ret;
2531
2532	*port_control = false;
2533	if (ieee80211_has_a4(fc: hdr->frame_control) &&
2534	sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2535	return RX_DROP_U_UNEXPECTED_VLAN_4ADDR;
2536
2537	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2538	!!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(fc: hdr->frame_control)) {
2539	if (!sdata->u.mgd.use_4addr)
2540	return RX_DROP_U_UNEXPECTED_STA_4ADDR;
2541	else if (!ether_addr_equal(addr1: hdr->addr1, addr2: sdata->vif.addr))
2542	check_port_control = true;
2543	}
2544
2545	if (is_multicast_ether_addr(addr: hdr->addr1) &&
2546	sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2547	return RX_DROP_U_UNEXPECTED_VLAN_MCAST;
2548
2549	ret = ieee80211_data_to_8023(skb: rx->skb, addr: sdata->vif.addr, iftype: sdata->vif.type);
2550	if (ret < 0)
2551	return RX_DROP_U_INVALID_8023;
2552
2553	ehdr = (struct ethhdr *) rx->skb->data;
2554	if (ehdr->h_proto == rx->sdata->control_port_protocol)
2555	*port_control = true;
2556	else if (check_port_control)
2557	return RX_DROP_U_NOT_PORT_CONTROL;
2558
2559	return RX_CONTINUE;
2560	}
2561
2562	bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
2563	const u8 *addr, int *out_link_id)
2564	{
2565	unsigned int link_id;
2566
2567	/* non-MLO, or MLD address replaced by hardware */
2568	if (ether_addr_equal(addr1: sdata->vif.addr, addr2: addr))
2569	return true;
2570
2571	if (!ieee80211_vif_is_mld(vif: &sdata->vif))
2572	return false;
2573
2574	for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
2575	struct ieee80211_bss_conf *conf;
2576
2577	conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2578
2579	if (!conf)
2580	continue;
2581	if (ether_addr_equal(addr1: conf->addr, addr2: addr)) {
2582	if (out_link_id)
2583	*out_link_id = link_id;
2584	return true;
2585	}
2586	}
2587
2588	return false;
2589	}
2590
2591	/*
2592	* requires that rx->skb is a frame with ethernet header
2593	*/
2594	static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2595	{
2596	static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2597	= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2598	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2599
2600	/*
2601	* Allow EAPOL frames to us/the PAE group address regardless of
2602	* whether the frame was encrypted or not, and always disallow
2603	* all other destination addresses for them.
2604	*/
2605	if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
2606	return ieee80211_is_our_addr(sdata: rx->sdata, addr: ehdr->h_dest, NULL) ||
2607	ether_addr_equal(addr1: ehdr->h_dest, addr2: pae_group_addr);
2608
2609	if (ieee80211_802_1x_port_control(rx) ||
2610	ieee80211_drop_unencrypted(rx, fc))
2611	return false;
2612
2613	return true;
2614	}
2615
2616	static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2617	struct ieee80211_rx_data *rx)
2618	{
2619	struct ieee80211_sub_if_data *sdata = rx->sdata;
2620	struct net_device *dev = sdata->dev;
2621
2622	if (unlikely((skb->protocol == sdata->control_port_protocol ||
2623	(skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
2624	!sdata->control_port_no_preauth)) &&
2625	sdata->control_port_over_nl80211)) {
2626	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2627	bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2628
2629	cfg80211_rx_control_port(dev, skb, unencrypted: noencrypt, link_id: rx->link_id);
2630	dev_kfree_skb(skb);
2631	} else {
2632	struct ethhdr *ehdr = (void *)skb_mac_header(skb);
2633
2634	memset(skb->cb, 0, sizeof(skb->cb));
2635
2636	/*
2637	* 802.1X over 802.11 requires that the authenticator address
2638	* be used for EAPOL frames. However, 802.1X allows the use of
2639	* the PAE group address instead. If the interface is part of
2640	* a bridge and we pass the frame with the PAE group address,
2641	* then the bridge will forward it to the network (even if the
2642	* client was not associated yet), which isn't supposed to
2643	* happen.
2644	* To avoid that, rewrite the destination address to our own
2645	* address, so that the authenticator (e.g. hostapd) will see
2646	* the frame, but bridge won't forward it anywhere else. Note
2647	* that due to earlier filtering, the only other address can
2648	* be the PAE group address, unless the hardware allowed them
2649	* through in 802.3 offloaded mode.
2650	*/
2651	if (unlikely(skb->protocol == sdata->control_port_protocol &&
2652	!ether_addr_equal(ehdr->h_dest, sdata->vif.addr)))
2653	ether_addr_copy(dst: ehdr->h_dest, src: sdata->vif.addr);
2654
2655	/* deliver to local stack */
2656	if (rx->list)
2657	list_add_tail(new: &skb->list, head: rx->list);
2658	else
2659	netif_receive_skb(skb);
2660	}
2661	}
2662
2663	/*
2664	* requires that rx->skb is a frame with ethernet header
2665	*/
2666	static void
2667	ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2668	{
2669	struct ieee80211_sub_if_data *sdata = rx->sdata;
2670	struct net_device *dev = sdata->dev;
2671	struct sk_buff *skb, *xmit_skb;
2672	struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2673	struct sta_info *dsta;
2674
2675	skb = rx->skb;
2676	xmit_skb = NULL;
2677
2678	dev_sw_netstats_rx_add(dev, len: skb->len);
2679
2680	if (rx->sta) {
2681	/* The seqno index has the same property as needed
2682	* for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2683	* for non-QoS-data frames. Here we know it's a data
2684	* frame, so count MSDUs.
2685	*/
2686	u64_stats_update_begin(syncp: &rx->link_sta->rx_stats.syncp);
2687	rx->link_sta->rx_stats.msdu[rx->seqno_idx]++;
2688	u64_stats_update_end(syncp: &rx->link_sta->rx_stats.syncp);
2689	}
2690
2691	if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2692	sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2693	!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2694	ehdr->h_proto != rx->sdata->control_port_protocol &&
2695	(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2696	if (is_multicast_ether_addr(addr: ehdr->h_dest) &&
2697	ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2698	/*
2699	* send multicast frames both to higher layers in
2700	* local net stack and back to the wireless medium
2701	*/
2702	xmit_skb = skb_copy(skb, GFP_ATOMIC);
2703	if (!xmit_skb)
2704	net_info_ratelimited("%s: failed to clone multicast frame\n",
2705	dev->name);
2706	} else if (!is_multicast_ether_addr(addr: ehdr->h_dest) &&
2707	!ether_addr_equal(addr1: ehdr->h_dest, addr2: ehdr->h_source)) {
2708	dsta = sta_info_get(sdata, addr: ehdr->h_dest);
2709	if (dsta) {
2710	/*
2711	* The destination station is associated to
2712	* this AP (in this VLAN), so send the frame
2713	* directly to it and do not pass it to local
2714	* net stack.
2715	*/
2716	xmit_skb = skb;
2717	skb = NULL;
2718	}
2719	}
2720	}
2721
2722	#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2723	if (skb) {
2724	/* 'align' will only take the values 0 or 2 here since all
2725	* frames are required to be aligned to 2-byte boundaries
2726	* when being passed to mac80211; the code here works just
2727	* as well if that isn't true, but mac80211 assumes it can
2728	* access fields as 2-byte aligned (e.g. for ether_addr_equal)
2729	*/
2730	int align;
2731
2732	align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2733	if (align) {
2734	if (WARN_ON(skb_headroom(skb) < 3)) {
2735	dev_kfree_skb(skb);
2736	skb = NULL;
2737	} else {
2738	u8 *data = skb->data;
2739	size_t len = skb_headlen(skb);
2740	skb->data -= align;
2741	memmove(skb->data, data, len);
2742	skb_set_tail_pointer(skb, len);
2743	}
2744	}
2745	}
2746	#endif
2747
2748	if (skb) {
2749	skb->protocol = eth_type_trans(skb, dev);
2750	ieee80211_deliver_skb_to_local_stack(skb, rx);
2751	}
2752
2753	if (xmit_skb) {
2754	/*
2755	* Send to wireless media and increase priority by 256 to
2756	* keep the received priority instead of reclassifying
2757	* the frame (see cfg80211_classify8021d).
2758	*/
2759	xmit_skb->priority += 256;
2760	xmit_skb->protocol = htons(ETH_P_802_3);
2761	skb_reset_network_header(skb: xmit_skb);
2762	skb_reset_mac_header(skb: xmit_skb);
2763	dev_queue_xmit(skb: xmit_skb);
2764	}
2765	}
2766
2767	#ifdef CONFIG_MAC80211_MESH
2768	static bool
2769	ieee80211_rx_mesh_fast_forward(struct ieee80211_sub_if_data *sdata,
2770	struct sk_buff *skb, int hdrlen)
2771	{
2772	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2773	struct ieee80211_mesh_fast_tx_key key = {
2774	.type = MESH_FAST_TX_TYPE_FORWARDED
2775	};
2776	struct ieee80211_mesh_fast_tx *entry;
2777	struct ieee80211s_hdr *mesh_hdr;
2778	struct tid_ampdu_tx *tid_tx;
2779	struct sta_info *sta;
2780	struct ethhdr eth;
2781	u8 tid;
2782
2783	mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
2784	if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2785	ether_addr_copy(dst: key.addr, src: mesh_hdr->eaddr1);
2786	else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
2787	ether_addr_copy(dst: key.addr, src: skb->data);
2788	else
2789	return false;
2790
2791	entry = mesh_fast_tx_get(sdata, key: &key);
2792	if (!entry)
2793	return false;
2794
2795	sta = rcu_dereference(entry->mpath->next_hop);
2796	if (!sta)
2797	return false;
2798
2799	if (skb_linearize(skb))
2800	return false;
2801
2802	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2803	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2804	if (tid_tx) {
2805	if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2806	return false;
2807
2808	if (tid_tx->timeout)
2809	tid_tx->last_tx = jiffies;
2810	}
2811
2812	ieee80211_aggr_check(sdata, sta, skb);
2813
2814	if (ieee80211_get_8023_tunnel_proto(hdr: skb->data + hdrlen,
2815	proto: &skb->protocol))
2816	hdrlen += ETH_ALEN;
2817	else
2818	skb->protocol = htons(skb->len - hdrlen);
2819	skb_set_network_header(skb, offset: hdrlen + 2);
2820
2821	skb->dev = sdata->dev;
2822	memcpy(&eth, skb->data, ETH_HLEN - 2);
2823	skb_pull(skb, len: 2);
2824	__ieee80211_xmit_fast(sdata, sta, fast_tx: &entry->fast_tx, skb, ampdu: tid_tx,
2825	da: eth.h_dest, sa: eth.h_source);
2826	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2827	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2828
2829	return true;
2830	}
2831	#endif
2832
2833	static ieee80211_rx_result
2834	ieee80211_rx_mesh_data(struct ieee80211_sub_if_data *sdata, struct sta_info *sta,
2835	struct sk_buff *skb)
2836	{
2837	#ifdef CONFIG_MAC80211_MESH
2838	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2839	struct ieee80211_local *local = sdata->local;
2840	uint16_t fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA;
2841	struct ieee80211_hdr hdr = {
2842	.frame_control = cpu_to_le16(fc)
2843	};
2844	struct ieee80211_hdr *fwd_hdr;
2845	struct ieee80211s_hdr *mesh_hdr;
2846	struct ieee80211_tx_info *info;
2847	struct sk_buff *fwd_skb;
2848	struct ethhdr *eth;
2849	bool multicast;
2850	int tailroom = 0;
2851	int hdrlen, mesh_hdrlen;
2852	u8 *qos;
2853
2854	if (!ieee80211_vif_is_mesh(vif: &sdata->vif))
2855	return RX_CONTINUE;
2856
2857	if (!pskb_may_pull(skb, len: sizeof(*eth) + 6))
2858	return RX_DROP;
2859
2860	mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(*eth));
2861	mesh_hdrlen = ieee80211_get_mesh_hdrlen(meshhdr: mesh_hdr);
2862
2863	if (!pskb_may_pull(skb, len: sizeof(*eth) + mesh_hdrlen))
2864	return RX_DROP;
2865
2866	eth = (struct ethhdr *)skb->data;
2867	multicast = is_multicast_ether_addr(addr: eth->h_dest);
2868
2869	mesh_hdr = (struct ieee80211s_hdr *)(eth + 1);
2870	if (!mesh_hdr->ttl)
2871	return RX_DROP;
2872
2873	/* frame is in RMC, don't forward */
2874	if (is_multicast_ether_addr(addr: eth->h_dest) &&
2875	mesh_rmc_check(sdata, addr: eth->h_source, mesh_hdr))
2876	return RX_DROP;
2877
2878	/* forward packet */
2879	if (sdata->crypto_tx_tailroom_needed_cnt)
2880	tailroom = IEEE80211_ENCRYPT_TAILROOM;
2881
2882	if (mesh_hdr->flags & MESH_FLAGS_AE) {
2883	struct mesh_path *mppath;
2884	char *proxied_addr;
2885	bool update = false;
2886
2887	if (multicast)
2888	proxied_addr = mesh_hdr->eaddr1;
2889	else if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
2890	/* has_a4 already checked in ieee80211_rx_mesh_check */
2891	proxied_addr = mesh_hdr->eaddr2;
2892	else
2893	return RX_DROP;
2894
2895	rcu_read_lock();
2896	mppath = mpp_path_lookup(sdata, dst: proxied_addr);
2897	if (!mppath) {
2898	mpp_path_add(sdata, dst: proxied_addr, mpp: eth->h_source);
2899	} else {
2900	spin_lock_bh(lock: &mppath->state_lock);
2901	if (!ether_addr_equal(addr1: mppath->mpp, addr2: eth->h_source)) {
2902	memcpy(mppath->mpp, eth->h_source, ETH_ALEN);
2903	update = true;
2904	}
2905	mppath->exp_time = jiffies;
2906	spin_unlock_bh(lock: &mppath->state_lock);
2907	}
2908
2909	/* flush fast xmit cache if the address path changed */
2910	if (update)
2911	mesh_fast_tx_flush_addr(sdata, addr: proxied_addr);
2912
2913	rcu_read_unlock();
2914	}
2915
2916	/* Frame has reached destination. Don't forward */
2917	if (ether_addr_equal(addr1: sdata->vif.addr, addr2: eth->h_dest))
2918	goto rx_accept;
2919
2920	if (!--mesh_hdr->ttl) {
2921	if (multicast)
2922	goto rx_accept;
2923
2924	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2925	return RX_DROP;
2926	}
2927
2928	if (!ifmsh->mshcfg.dot11MeshForwarding) {
2929	if (is_multicast_ether_addr(addr: eth->h_dest))
2930	goto rx_accept;
2931
2932	return RX_DROP;
2933	}
2934
2935	skb_set_queue_mapping(skb, queue_mapping: ieee802_1d_to_ac[skb->priority]);
2936
2937	if (!multicast &&
2938	ieee80211_rx_mesh_fast_forward(sdata, skb, hdrlen: mesh_hdrlen))
2939	return RX_QUEUED;
2940
2941	ieee80211_fill_mesh_addresses(hdr: &hdr, fc: &hdr.frame_control,
2942	da: eth->h_dest, sa: eth->h_source);
2943	hdrlen = ieee80211_hdrlen(fc: hdr.frame_control);
2944	if (multicast) {
2945	int extra_head = sizeof(struct ieee80211_hdr) - sizeof(*eth);
2946
2947	fwd_skb = skb_copy_expand(skb, newheadroom: local->tx_headroom + extra_head +
2948	IEEE80211_ENCRYPT_HEADROOM,
2949	newtailroom: tailroom, GFP_ATOMIC);
2950	if (!fwd_skb)
2951	goto rx_accept;
2952	} else {
2953	fwd_skb = skb;
2954	skb = NULL;
2955
2956	if (skb_cow_head(skb: fwd_skb, headroom: hdrlen - sizeof(struct ethhdr)))
2957	return RX_DROP_U_OOM;
2958
2959	if (skb_linearize(skb: fwd_skb))
2960	return RX_DROP_U_OOM;
2961	}
2962
2963	fwd_hdr = skb_push(skb: fwd_skb, len: hdrlen - sizeof(struct ethhdr));
2964	memcpy(fwd_hdr, &hdr, hdrlen - 2);
2965	qos = ieee80211_get_qos_ctl(hdr: fwd_hdr);
2966	qos[0] = qos[1] = 0;
2967
2968	skb_reset_mac_header(skb: fwd_skb);
2969	hdrlen += mesh_hdrlen;
2970	if (ieee80211_get_8023_tunnel_proto(hdr: fwd_skb->data + hdrlen,
2971	proto: &fwd_skb->protocol))
2972	hdrlen += ETH_ALEN;
2973	else
2974	fwd_skb->protocol = htons(fwd_skb->len - hdrlen);
2975	skb_set_network_header(skb: fwd_skb, offset: hdrlen + 2);
2976
2977	info = IEEE80211_SKB_CB(skb: fwd_skb);
2978	memset(info, 0, sizeof(*info));
2979	info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
2980	info->control.vif = &sdata->vif;
2981	info->control.jiffies = jiffies;
2982	fwd_skb->dev = sdata->dev;
2983	if (multicast) {
2984	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2985	memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2986	/* update power mode indication when forwarding */
2987	ieee80211_mps_set_frame_flags(sdata, NULL, hdr: fwd_hdr);
2988	} else if (!mesh_nexthop_lookup(sdata, skb: fwd_skb)) {
2989	/* mesh power mode flags updated in mesh_nexthop_lookup */
2990	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2991	} else {
2992	/* unable to resolve next hop */
2993	if (sta)
2994	mesh_path_error_tx(sdata, ttl: ifmsh->mshcfg.element_ttl,
2995	target: hdr.addr3, target_sn: 0,
2996	target_rcode: WLAN_REASON_MESH_PATH_NOFORWARD,
2997	ra: sta->sta.addr);
2998	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2999	kfree_skb(skb: fwd_skb);
3000	goto rx_accept;
3001	}
3002
3003	IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
3004	ieee80211_set_qos_hdr(sdata, skb: fwd_skb);
3005	ieee80211_add_pending_skb(local, skb: fwd_skb);
3006
3007	rx_accept:
3008	if (!skb)
3009	return RX_QUEUED;
3010
3011	ieee80211_strip_8023_mesh_hdr(skb);
3012	#endif
3013
3014	return RX_CONTINUE;
3015	}
3016
3017	static ieee80211_rx_result debug_noinline
3018	__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
3019	{
3020	struct net_device *dev = rx->sdata->dev;
3021	struct sk_buff *skb = rx->skb;
3022	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3023	__le16 fc = hdr->frame_control;
3024	struct sk_buff_head frame_list;
3025	ieee80211_rx_result res;
3026	struct ethhdr ethhdr;
3027	const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
3028
3029	if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3030	check_da = NULL;
3031	check_sa = NULL;
3032	} else switch (rx->sdata->vif.type) {
3033	case NL80211_IFTYPE_AP:
3034	case NL80211_IFTYPE_AP_VLAN:
3035	check_da = NULL;
3036	break;
3037	case NL80211_IFTYPE_STATION:
3038	if (!test_sta_flag(sta: rx->sta, flag: WLAN_STA_TDLS_PEER))
3039	check_sa = NULL;
3040	break;
3041	case NL80211_IFTYPE_MESH_POINT:
3042	check_sa = NULL;
3043	check_da = NULL;
3044	break;
3045	default:
3046	break;
3047	}
3048
3049	skb->dev = dev;
3050	__skb_queue_head_init(list: &frame_list);
3051
3052	if (ieee80211_data_to_8023_exthdr(skb, ehdr: &ethhdr,
3053	addr: rx->sdata->vif.addr,
3054	iftype: rx->sdata->vif.type,
3055	data_offset, is_amsdu: true))
3056	return RX_DROP_U_BAD_AMSDU;
3057
3058	if (rx->sta->amsdu_mesh_control < 0) {
3059	s8 valid = -1;
3060	int i;
3061
3062	for (i = 0; i <= 2; i++) {
3063	if (!ieee80211_is_valid_amsdu(skb, mesh_hdr: i))
3064	continue;
3065
3066	if (valid >= 0) {
3067	/* ambiguous */
3068	valid = -1;
3069	break;
3070	}
3071
3072	valid = i;
3073	}
3074
3075	rx->sta->amsdu_mesh_control = valid;
3076	}
3077
3078	ieee80211_amsdu_to_8023s(skb, list: &frame_list, addr: dev->dev_addr,
3079	iftype: rx->sdata->vif.type,
3080	extra_headroom: rx->local->hw.extra_tx_headroom,
3081	check_da, check_sa,
3082	mesh_control: rx->sta->amsdu_mesh_control);
3083
3084	while (!skb_queue_empty(list: &frame_list)) {
3085	rx->skb = __skb_dequeue(list: &frame_list);
3086
3087	res = ieee80211_rx_mesh_data(sdata: rx->sdata, sta: rx->sta, skb: rx->skb);
3088	switch (res) {
3089	case RX_QUEUED:
3090	continue;
3091	case RX_CONTINUE:
3092	break;
3093	default:
3094	goto free;
3095	}
3096
3097	if (!ieee80211_frame_allowed(rx, fc))
3098	goto free;
3099
3100	ieee80211_deliver_skb(rx);
3101	continue;
3102
3103	free:
3104	dev_kfree_skb(rx->skb);
3105	}
3106
3107	return RX_QUEUED;
3108	}
3109
3110	static ieee80211_rx_result debug_noinline
3111	ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
3112	{
3113	struct sk_buff *skb = rx->skb;
3114	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3115	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3116	__le16 fc = hdr->frame_control;
3117
3118	if (!(status->rx_flags & IEEE80211_RX_AMSDU))
3119	return RX_CONTINUE;
3120
3121	if (unlikely(!ieee80211_is_data(fc)))
3122	return RX_CONTINUE;
3123
3124	if (unlikely(!ieee80211_is_data_present(fc)))
3125	return RX_DROP;
3126
3127	if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
3128	switch (rx->sdata->vif.type) {
3129	case NL80211_IFTYPE_AP_VLAN:
3130	if (!rx->sdata->u.vlan.sta)
3131	return RX_DROP_U_BAD_4ADDR;
3132	break;
3133	case NL80211_IFTYPE_STATION:
3134	if (!rx->sdata->u.mgd.use_4addr)
3135	return RX_DROP_U_BAD_4ADDR;
3136	break;
3137	case NL80211_IFTYPE_MESH_POINT:
3138	break;
3139	default:
3140	return RX_DROP_U_BAD_4ADDR;
3141	}
3142	}
3143
3144	if (is_multicast_ether_addr(addr: hdr->addr1) || !rx->sta)
3145	return RX_DROP_U_BAD_AMSDU;
3146
3147	if (rx->key) {
3148	/*
3149	* We should not receive A-MSDUs on pre-HT connections,
3150	* and HT connections cannot use old ciphers. Thus drop
3151	* them, as in those cases we couldn't even have SPP
3152	* A-MSDUs or such.
3153	*/
3154	switch (rx->key->conf.cipher) {
3155	case WLAN_CIPHER_SUITE_WEP40:
3156	case WLAN_CIPHER_SUITE_WEP104:
3157	case WLAN_CIPHER_SUITE_TKIP:
3158	return RX_DROP_U_BAD_AMSDU_CIPHER;
3159	default:
3160	break;
3161	}
3162	}
3163
3164	return __ieee80211_rx_h_amsdu(rx, data_offset: 0);
3165	}
3166
3167	static ieee80211_rx_result debug_noinline
3168	ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
3169	{
3170	struct ieee80211_sub_if_data *sdata = rx->sdata;
3171	struct ieee80211_local *local = rx->local;
3172	struct net_device *dev = sdata->dev;
3173	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3174	__le16 fc = hdr->frame_control;
3175	ieee80211_rx_result res;
3176	bool port_control;
3177
3178	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
3179	return RX_CONTINUE;
3180
3181	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3182	return RX_DROP;
3183
3184	/* Send unexpected-4addr-frame event to hostapd */
3185	if (ieee80211_has_a4(fc: hdr->frame_control) &&
3186	sdata->vif.type == NL80211_IFTYPE_AP) {
3187	if (rx->sta &&
3188	!test_and_set_sta_flag(sta: rx->sta, flag: WLAN_STA_4ADDR_EVENT))
3189	cfg80211_rx_unexpected_4addr_frame(
3190	dev: rx->sdata->dev, addr: rx->sta->sta.addr, GFP_ATOMIC);
3191	return RX_DROP;
3192	}
3193
3194	res = __ieee80211_data_to_8023(rx, port_control: &port_control);
3195	if (unlikely(res != RX_CONTINUE))
3196	return res;
3197
3198	res = ieee80211_rx_mesh_data(sdata: rx->sdata, sta: rx->sta, skb: rx->skb);
3199	if (res != RX_CONTINUE)
3200	return res;
3201
3202	if (!ieee80211_frame_allowed(rx, fc))
3203	return RX_DROP;
3204
3205	/* directly handle TDLS channel switch requests/responses */
3206	if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
3207	cpu_to_be16(ETH_P_TDLS))) {
3208	struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
3209
3210	if (pskb_may_pull(skb: rx->skb,
3211	offsetof(struct ieee80211_tdls_data, u)) &&
3212	tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
3213	tf->category == WLAN_CATEGORY_TDLS &&
3214	(tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
3215	tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
3216	rx->skb->protocol = cpu_to_be16(ETH_P_TDLS);
3217	__ieee80211_queue_skb_to_iface(sdata, link_id: rx->link_id,
3218	sta: rx->sta, skb: rx->skb);
3219	return RX_QUEUED;
3220	}
3221	}
3222
3223	if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
3224	unlikely(port_control) && sdata->bss) {
3225	sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
3226	u.ap);
3227	dev = sdata->dev;
3228	rx->sdata = sdata;
3229	}
3230
3231	rx->skb->dev = dev;
3232
3233	if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3234	local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
3235	!is_multicast_ether_addr(
3236	addr: ((struct ethhdr *)rx->skb->data)->h_dest) &&
3237	(!local->scanning &&
3238	!test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
3239	mod_timer(timer: &local->dynamic_ps_timer, expires: jiffies +
3240	msecs_to_jiffies(m: local->hw.conf.dynamic_ps_timeout));
3241
3242	ieee80211_deliver_skb(rx);
3243
3244	return RX_QUEUED;
3245	}
3246
3247	static ieee80211_rx_result debug_noinline
3248	ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
3249	{
3250	struct sk_buff *skb = rx->skb;
3251	struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
3252	struct tid_ampdu_rx *tid_agg_rx;
3253	u16 start_seq_num;
3254	u16 tid;
3255
3256	if (likely(!ieee80211_is_ctl(bar->frame_control)))
3257	return RX_CONTINUE;
3258
3259	if (ieee80211_is_back_req(fc: bar->frame_control)) {
3260	struct {
3261	__le16 control, start_seq_num;
3262	} __packed bar_data;
3263	struct ieee80211_event event = {
3264	.type = BAR_RX_EVENT,
3265	};
3266
3267	if (!rx->sta)
3268	return RX_DROP;
3269
3270	if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
3271	to: &bar_data, len: sizeof(bar_data)))
3272	return RX_DROP;
3273
3274	tid = le16_to_cpu(bar_data.control) >> 12;
3275
3276	if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
3277	!test_and_set_bit(nr: tid, addr: rx->sta->ampdu_mlme.unexpected_agg))
3278	ieee80211_send_delba(sdata: rx->sdata, da: rx->sta->sta.addr, tid,
3279	initiator: WLAN_BACK_RECIPIENT,
3280	reason_code: WLAN_REASON_QSTA_REQUIRE_SETUP);
3281
3282	tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
3283	if (!tid_agg_rx)
3284	return RX_DROP;
3285
3286	start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
3287	event.u.ba.tid = tid;
3288	event.u.ba.ssn = start_seq_num;
3289	event.u.ba.sta = &rx->sta->sta;
3290
3291	/* reset session timer */
3292	if (tid_agg_rx->timeout)
3293	mod_timer(timer: &tid_agg_rx->session_timer,
3294	TU_TO_EXP_TIME(tid_agg_rx->timeout));
3295
3296	spin_lock(lock: &tid_agg_rx->reorder_lock);
3297	/* release stored frames up to start of BAR */
3298	ieee80211_release_reorder_frames(sdata: rx->sdata, tid_agg_rx,
3299	head_seq_num: start_seq_num, frames);
3300	spin_unlock(lock: &tid_agg_rx->reorder_lock);
3301
3302	drv_event_callback(local: rx->local, sdata: rx->sdata, event: &event);
3303
3304	kfree_skb(skb);
3305	return RX_QUEUED;
3306	}
3307
3308	return RX_DROP;
3309	}
3310
3311	static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
3312	struct ieee80211_mgmt *mgmt,
3313	size_t len)
3314	{
3315	struct ieee80211_local *local = sdata->local;
3316	struct sk_buff *skb;
3317	struct ieee80211_mgmt *resp;
3318
3319	if (!ether_addr_equal(addr1: mgmt->da, addr2: sdata->vif.addr)) {
3320	/* Not to own unicast address */
3321	return;
3322	}
3323
3324	if (!ether_addr_equal(addr1: mgmt->sa, addr2: sdata->vif.cfg.ap_addr) ||
3325	!ether_addr_equal(addr1: mgmt->bssid, addr2: sdata->vif.cfg.ap_addr)) {
3326	/* Not from the current AP or not associated yet. */
3327	return;
3328	}
3329
3330	if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
3331	/* Too short SA Query request frame */
3332	return;
3333	}
3334
3335	skb = dev_alloc_skb(length: sizeof(*resp) + local->hw.extra_tx_headroom);
3336	if (skb == NULL)
3337	return;
3338
3339	skb_reserve(skb, len: local->hw.extra_tx_headroom);
3340	resp = skb_put_zero(skb, len: 24);
3341	memcpy(resp->da, sdata->vif.cfg.ap_addr, ETH_ALEN);
3342	memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
3343	memcpy(resp->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);
3344	resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3345	IEEE80211_STYPE_ACTION);
3346	skb_put(skb, len: 1 + sizeof(resp->u.action.u.sa_query));
3347	resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
3348	resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
3349	memcpy(resp->u.action.u.sa_query.trans_id,
3350	mgmt->u.action.u.sa_query.trans_id,
3351	WLAN_SA_QUERY_TR_ID_LEN);
3352
3353	ieee80211_tx_skb(sdata, skb);
3354	}
3355
3356	static void
3357	ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
3358	{
3359	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3360	struct ieee80211_bss_conf *bss_conf;
3361	const struct element *ie;
3362	size_t baselen;
3363
3364	if (!wiphy_ext_feature_isset(wiphy: rx->local->hw.wiphy,
3365	ftidx: NL80211_EXT_FEATURE_BSS_COLOR))
3366	return;
3367
3368	if (ieee80211_hw_check(&rx->local->hw, DETECTS_COLOR_COLLISION))
3369	return;
3370
3371	bss_conf = rx->link->conf;
3372	if (bss_conf->csa_active || bss_conf->color_change_active ||
3373	!bss_conf->he_bss_color.enabled)
3374	return;
3375
3376	baselen = mgmt->u.beacon.variable - rx->skb->data;
3377	if (baselen > rx->skb->len)
3378	return;
3379
3380	ie = cfg80211_find_ext_elem(ext_eid: WLAN_EID_EXT_HE_OPERATION,
3381	ies: mgmt->u.beacon.variable,
3382	len: rx->skb->len - baselen);
3383	if (ie && ie->datalen >= sizeof(struct ieee80211_he_operation) &&
3384	ie->datalen >= ieee80211_he_oper_size(he_oper_ie: ie->data + 1)) {
3385	const struct ieee80211_he_operation *he_oper;
3386	u8 color;
3387
3388	he_oper = (void *)(ie->data + 1);
3389	if (le32_get_bits(v: he_oper->he_oper_params,
3390	IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED))
3391	return;
3392
3393	color = le32_get_bits(v: he_oper->he_oper_params,
3394	IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3395	if (color == bss_conf->he_bss_color.color)
3396	ieee80211_obss_color_collision_notify(vif: &rx->sdata->vif,
3397	BIT_ULL(color),
3398	link_id: bss_conf->link_id);
3399	}
3400	}
3401
3402	static ieee80211_rx_result debug_noinline
3403	ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3404	{
3405	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3406	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
3407
3408	if (ieee80211_is_s1g_beacon(fc: mgmt->frame_control))
3409	return RX_CONTINUE;
3410
3411	/*
3412	* From here on, look only at management frames.
3413	* Data and control frames are already handled,
3414	* and unknown (reserved) frames are useless.
3415	*/
3416	if (rx->skb->len < 24)
3417	return RX_DROP;
3418
3419	if (!ieee80211_is_mgmt(fc: mgmt->frame_control))
3420	return RX_DROP;
3421
3422	/* drop too small action frames */
3423	if (ieee80211_is_action(fc: mgmt->frame_control) &&
3424	rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
3425	return RX_DROP_U_RUNT_ACTION;
3426
3427	if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3428	ieee80211_is_beacon(fc: mgmt->frame_control) &&
3429	!(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3430	int sig = 0;
3431
3432	/* sw bss color collision detection */
3433	ieee80211_rx_check_bss_color_collision(rx);
3434
3435	if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3436	!(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3437	sig = status->signal;
3438
3439	cfg80211_report_obss_beacon_khz(wiphy: rx->local->hw.wiphy,
3440	frame: rx->skb->data, len: rx->skb->len,
3441	freq: ieee80211_rx_status_to_khz(rx_status: status),
3442	sig_dbm: sig);
3443	rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3444	}
3445
3446	return ieee80211_drop_unencrypted_mgmt(rx);
3447	}
3448
3449	static bool
3450	ieee80211_process_rx_twt_action(struct ieee80211_rx_data *rx)
3451	{
3452	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)rx->skb->data;
3453	struct ieee80211_sub_if_data *sdata = rx->sdata;
3454
3455	/* TWT actions are only supported in AP for the moment */
3456	if (sdata->vif.type != NL80211_IFTYPE_AP)
3457	return false;
3458
3459	if (!rx->local->ops->add_twt_setup)
3460	return false;
3461
3462	if (!sdata->vif.bss_conf.twt_responder)
3463	return false;
3464
3465	if (!rx->sta)
3466	return false;
3467
3468	switch (mgmt->u.action.u.s1g.action_code) {
3469	case WLAN_S1G_TWT_SETUP: {
3470	struct ieee80211_twt_setup *twt;
3471
3472	if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3473	1 + /* action code */
3474	sizeof(struct ieee80211_twt_setup) +
3475	2 /* TWT req_type agrt */)
3476	break;
3477
3478	twt = (void *)mgmt->u.action.u.s1g.variable;
3479	if (twt->element_id != WLAN_EID_S1G_TWT)
3480	break;
3481
3482	if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE +
3483	4 + /* action code + token + tlv */
3484	twt->length)
3485	break;
3486
3487	return true; /* queue the frame */
3488	}
3489	case WLAN_S1G_TWT_TEARDOWN:
3490	if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE + 2)
3491	break;
3492
3493	return true; /* queue the frame */
3494	default:
3495	break;
3496	}
3497
3498	return false;
3499	}
3500
3501	static ieee80211_rx_result debug_noinline
3502	ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3503	{
3504	struct ieee80211_local *local = rx->local;
3505	struct ieee80211_sub_if_data *sdata = rx->sdata;
3506	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3507	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
3508	int len = rx->skb->len;
3509
3510	if (!ieee80211_is_action(fc: mgmt->frame_control))
3511	return RX_CONTINUE;
3512
3513	if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3514	mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3515	mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3516	return RX_DROP_U_ACTION_UNKNOWN_SRC;
3517
3518	switch (mgmt->u.action.category) {
3519	case WLAN_CATEGORY_HT:
3520	/* reject HT action frames from stations not supporting HT */
3521	if (!rx->link_sta->pub->ht_cap.ht_supported)
3522	goto invalid;
3523
3524	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3525	sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3526	sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3527	sdata->vif.type != NL80211_IFTYPE_AP &&
3528	sdata->vif.type != NL80211_IFTYPE_ADHOC)
3529	break;
3530
3531	/* verify action & smps_control/chanwidth are present */
3532	if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3533	goto invalid;
3534
3535	switch (mgmt->u.action.u.ht_smps.action) {
3536	case WLAN_HT_ACTION_SMPS: {
3537	struct ieee80211_supported_band *sband;
3538	enum ieee80211_smps_mode smps_mode;
3539	struct sta_opmode_info sta_opmode = {};
3540
3541	if (sdata->vif.type != NL80211_IFTYPE_AP &&
3542	sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3543	goto handled;
3544
3545	/* convert to HT capability */
3546	switch (mgmt->u.action.u.ht_smps.smps_control) {
3547	case WLAN_HT_SMPS_CONTROL_DISABLED:
3548	smps_mode = IEEE80211_SMPS_OFF;
3549	break;
3550	case WLAN_HT_SMPS_CONTROL_STATIC:
3551	smps_mode = IEEE80211_SMPS_STATIC;
3552	break;
3553	case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3554	smps_mode = IEEE80211_SMPS_DYNAMIC;
3555	break;
3556	default:
3557	goto invalid;
3558	}
3559
3560	/* if no change do nothing */
3561	if (rx->link_sta->pub->smps_mode == smps_mode)
3562	goto handled;
3563	rx->link_sta->pub->smps_mode = smps_mode;
3564	sta_opmode.smps_mode =
3565	ieee80211_smps_mode_to_smps_mode(smps: smps_mode);
3566	sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3567
3568	sband = rx->local->hw.wiphy->bands[status->band];
3569
3570	rate_control_rate_update(local, sband, link_sta: rx->link_sta,
3571	changed: IEEE80211_RC_SMPS_CHANGED);
3572	cfg80211_sta_opmode_change_notify(dev: sdata->dev,
3573	mac: rx->sta->addr,
3574	sta_opmode: &sta_opmode,
3575	GFP_ATOMIC);
3576	goto handled;
3577	}
3578	case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3579	struct ieee80211_supported_band *sband;
3580	u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3581	enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3582	struct sta_opmode_info sta_opmode = {};
3583
3584	/* If it doesn't support 40 MHz it can't change ... */
3585	if (!(rx->link_sta->pub->ht_cap.cap &
3586	IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3587	goto handled;
3588
3589	if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3590	max_bw = IEEE80211_STA_RX_BW_20;
3591	else
3592	max_bw = ieee80211_sta_cap_rx_bw(link_sta: rx->link_sta);
3593
3594	/* set cur_max_bandwidth and recalc sta bw */
3595	rx->link_sta->cur_max_bandwidth = max_bw;
3596	new_bw = ieee80211_sta_cur_vht_bw(link_sta: rx->link_sta);
3597
3598	if (rx->link_sta->pub->bandwidth == new_bw)
3599	goto handled;
3600
3601	rx->link_sta->pub->bandwidth = new_bw;
3602	sband = rx->local->hw.wiphy->bands[status->band];
3603	sta_opmode.bw =
3604	ieee80211_sta_rx_bw_to_chan_width(sta: rx->link_sta);
3605	sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3606
3607	rate_control_rate_update(local, sband, link_sta: rx->link_sta,
3608	changed: IEEE80211_RC_BW_CHANGED);
3609	cfg80211_sta_opmode_change_notify(dev: sdata->dev,
3610	mac: rx->sta->addr,
3611	sta_opmode: &sta_opmode,
3612	GFP_ATOMIC);
3613	goto handled;
3614	}
3615	default:
3616	goto invalid;
3617	}
3618
3619	break;
3620	case WLAN_CATEGORY_PUBLIC:
3621	case WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION:
3622	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3623	goto invalid;
3624	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3625	break;
3626	if (!rx->sta)
3627	break;
3628	if (!ether_addr_equal(addr1: mgmt->bssid, addr2: sdata->deflink.u.mgd.bssid))
3629	break;
3630	if (mgmt->u.action.u.ext_chan_switch.action_code !=
3631	WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3632	break;
3633	if (len < offsetof(struct ieee80211_mgmt,
3634	u.action.u.ext_chan_switch.variable))
3635	goto invalid;
3636	goto queue;
3637	case WLAN_CATEGORY_VHT:
3638	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3639	sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3640	sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3641	sdata->vif.type != NL80211_IFTYPE_AP &&
3642	sdata->vif.type != NL80211_IFTYPE_ADHOC)
3643	break;
3644
3645	/* verify action code is present */
3646	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3647	goto invalid;
3648
3649	switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3650	case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3651	/* verify opmode is present */
3652	if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3653	goto invalid;
3654	goto queue;
3655	}
3656	case WLAN_VHT_ACTION_GROUPID_MGMT: {
3657	if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3658	goto invalid;
3659	goto queue;
3660	}
3661	default:
3662	break;
3663	}
3664	break;
3665	case WLAN_CATEGORY_BACK:
3666	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3667	sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3668	sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3669	sdata->vif.type != NL80211_IFTYPE_AP &&
3670	sdata->vif.type != NL80211_IFTYPE_ADHOC)
3671	break;
3672
3673	/* verify action_code is present */
3674	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3675	break;
3676
3677	switch (mgmt->u.action.u.addba_req.action_code) {
3678	case WLAN_ACTION_ADDBA_REQ:
3679	if (len < (IEEE80211_MIN_ACTION_SIZE +
3680	sizeof(mgmt->u.action.u.addba_req)))
3681	goto invalid;
3682	break;
3683	case WLAN_ACTION_ADDBA_RESP:
3684	if (len < (IEEE80211_MIN_ACTION_SIZE +
3685	sizeof(mgmt->u.action.u.addba_resp)))
3686	goto invalid;
3687	break;
3688	case WLAN_ACTION_DELBA:
3689	if (len < (IEEE80211_MIN_ACTION_SIZE +
3690	sizeof(mgmt->u.action.u.delba)))
3691	goto invalid;
3692	break;
3693	default:
3694	goto invalid;
3695	}
3696
3697	goto queue;
3698	case WLAN_CATEGORY_SPECTRUM_MGMT:
3699	/* verify action_code is present */
3700	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3701	break;
3702
3703	switch (mgmt->u.action.u.measurement.action_code) {
3704	case WLAN_ACTION_SPCT_MSR_REQ:
3705	if (status->band != NL80211_BAND_5GHZ)
3706	break;
3707
3708	if (len < (IEEE80211_MIN_ACTION_SIZE +
3709	sizeof(mgmt->u.action.u.measurement)))
3710	break;
3711
3712	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3713	break;
3714
3715	ieee80211_process_measurement_req(sdata, mgmt, len);
3716	goto handled;
3717	case WLAN_ACTION_SPCT_CHL_SWITCH: {
3718	u8 *bssid;
3719	if (len < (IEEE80211_MIN_ACTION_SIZE +
3720	sizeof(mgmt->u.action.u.chan_switch)))
3721	break;
3722
3723	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3724	sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3725	sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3726	break;
3727
3728	if (sdata->vif.type == NL80211_IFTYPE_STATION)
3729	bssid = sdata->deflink.u.mgd.bssid;
3730	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3731	bssid = sdata->u.ibss.bssid;
3732	else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3733	bssid = mgmt->sa;
3734	else
3735	break;
3736
3737	if (!ether_addr_equal(addr1: mgmt->bssid, addr2: bssid))
3738	break;
3739
3740	goto queue;
3741	}
3742	}
3743	break;
3744	case WLAN_CATEGORY_SELF_PROTECTED:
3745	if (len < (IEEE80211_MIN_ACTION_SIZE +
3746	sizeof(mgmt->u.action.u.self_prot.action_code)))
3747	break;
3748
3749	switch (mgmt->u.action.u.self_prot.action_code) {
3750	case WLAN_SP_MESH_PEERING_OPEN:
3751	case WLAN_SP_MESH_PEERING_CLOSE:
3752	case WLAN_SP_MESH_PEERING_CONFIRM:
3753	if (!ieee80211_vif_is_mesh(vif: &sdata->vif))
3754	goto invalid;
3755	if (sdata->u.mesh.user_mpm)
3756	/* userspace handles this frame */
3757	break;
3758	goto queue;
3759	case WLAN_SP_MGK_INFORM:
3760	case WLAN_SP_MGK_ACK:
3761	if (!ieee80211_vif_is_mesh(vif: &sdata->vif))
3762	goto invalid;
3763	break;
3764	}
3765	break;
3766	case WLAN_CATEGORY_MESH_ACTION:
3767	if (len < (IEEE80211_MIN_ACTION_SIZE +
3768	sizeof(mgmt->u.action.u.mesh_action.action_code)))
3769	break;
3770
3771	if (!ieee80211_vif_is_mesh(vif: &sdata->vif))
3772	break;
3773	if (mesh_action_is_path_sel(mgmt) &&
3774	!mesh_path_sel_is_hwmp(sdata))
3775	break;
3776	goto queue;
3777	case WLAN_CATEGORY_S1G:
3778	if (len < offsetofend(typeof(*mgmt),
3779	u.action.u.s1g.action_code))
3780	break;
3781
3782	switch (mgmt->u.action.u.s1g.action_code) {
3783	case WLAN_S1G_TWT_SETUP:
3784	case WLAN_S1G_TWT_TEARDOWN:
3785	if (ieee80211_process_rx_twt_action(rx))
3786	goto queue;
3787	break;
3788	default:
3789	break;
3790	}
3791	break;
3792	case WLAN_CATEGORY_PROTECTED_EHT:
3793	if (len < offsetofend(typeof(*mgmt),
3794	u.action.u.ttlm_req.action_code))
3795	break;
3796
3797	switch (mgmt->u.action.u.ttlm_req.action_code) {
3798	case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
3799	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3800	break;
3801
3802	if (len < offsetofend(typeof(*mgmt),
3803	u.action.u.ttlm_req))
3804	goto invalid;
3805	goto queue;
3806	case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
3807	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3808	break;
3809
3810	if (len < offsetofend(typeof(*mgmt),
3811	u.action.u.ttlm_res))
3812	goto invalid;
3813	goto queue;
3814	case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN:
3815	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3816	break;
3817
3818	if (len < offsetofend(typeof(*mgmt),
3819	u.action.u.ttlm_tear_down))
3820	goto invalid;
3821	goto queue;
3822	case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP:
3823	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3824	break;
3825
3826	/* The reconfiguration response action frame must
3827	* least one 'Status Duple' entry (3 octets)
3828	*/
3829	if (len <
3830	offsetofend(typeof(*mgmt),
3831	u.action.u.ml_reconf_resp) + 3)
3832	goto invalid;
3833	goto queue;
3834	case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP:
3835	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3836	break;
3837
3838	if (len < offsetofend(typeof(*mgmt),
3839	u.action.u.epcs) +
3840	IEEE80211_EPCS_ENA_RESP_BODY_LEN)
3841	goto invalid;
3842	goto queue;
3843	case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN:
3844	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3845	break;
3846
3847	if (len < offsetofend(typeof(*mgmt),
3848	u.action.u.epcs))
3849	goto invalid;
3850	goto queue;
3851	default:
3852	break;
3853	}
3854	break;
3855	}
3856
3857	return RX_CONTINUE;
3858
3859	invalid:
3860	status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3861	/* will return in the next handlers */
3862	return RX_CONTINUE;
3863
3864	handled:
3865	if (rx->sta)
3866	rx->link_sta->rx_stats.packets++;
3867	dev_kfree_skb(rx->skb);
3868	return RX_QUEUED;
3869
3870	queue:
3871	ieee80211_queue_skb_to_iface(sdata, link_id: rx->link_id, sta: rx->sta, skb: rx->skb);
3872	return RX_QUEUED;
3873	}
3874
3875	static ieee80211_rx_result debug_noinline
3876	ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3877	{
3878	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
3879	struct cfg80211_rx_info info = {
3880	.freq = ieee80211_rx_status_to_khz(rx_status: status),
3881	.buf = rx->skb->data,
3882	.len = rx->skb->len,
3883	.link_id = rx->link_id,
3884	.have_link_id = rx->link_id >= 0,
3885	};
3886
3887	/* skip known-bad action frames and return them in the next handler */
3888	if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3889	return RX_CONTINUE;
3890
3891	/*
3892	* Getting here means the kernel doesn't know how to handle
3893	* it, but maybe userspace does ... include returned frames
3894	* so userspace can register for those to know whether ones
3895	* it transmitted were processed or returned.
3896	*/
3897
3898	if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3899	!(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3900	info.sig_dbm = status->signal;
3901
3902	if (ieee80211_is_timing_measurement(skb: rx->skb) ||
3903	ieee80211_is_ftm(skb: rx->skb)) {
3904	info.rx_tstamp = ktime_to_ns(kt: skb_hwtstamps(skb: rx->skb)->hwtstamp);
3905	info.ack_tstamp = ktime_to_ns(kt: status->ack_tx_hwtstamp);
3906	}
3907
3908	if (cfg80211_rx_mgmt_ext(wdev: &rx->sdata->wdev, info: &info)) {
3909	if (rx->sta)
3910	rx->link_sta->rx_stats.packets++;
3911	dev_kfree_skb(rx->skb);
3912	return RX_QUEUED;
3913	}
3914
3915	return RX_CONTINUE;
3916	}
3917
3918	static ieee80211_rx_result debug_noinline
3919	ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx)
3920	{
3921	struct ieee80211_sub_if_data *sdata = rx->sdata;
3922	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3923	int len = rx->skb->len;
3924
3925	if (!ieee80211_is_action(fc: mgmt->frame_control))
3926	return RX_CONTINUE;
3927
3928	switch (mgmt->u.action.category) {
3929	case WLAN_CATEGORY_SA_QUERY:
3930	if (len < (IEEE80211_MIN_ACTION_SIZE +
3931	sizeof(mgmt->u.action.u.sa_query)))
3932	break;
3933
3934	switch (mgmt->u.action.u.sa_query.action) {
3935	case WLAN_ACTION_SA_QUERY_REQUEST:
3936	if (sdata->vif.type != NL80211_IFTYPE_STATION)
3937	break;
3938	ieee80211_process_sa_query_req(sdata, mgmt, len);
3939	goto handled;
3940	}
3941	break;
3942	}
3943
3944	return RX_CONTINUE;
3945
3946	handled:
3947	if (rx->sta)
3948	rx->link_sta->rx_stats.packets++;
3949	dev_kfree_skb(rx->skb);
3950	return RX_QUEUED;
3951	}
3952
3953	static ieee80211_rx_result debug_noinline
3954	ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3955	{
3956	struct ieee80211_local *local = rx->local;
3957	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3958	struct sk_buff *nskb;
3959	struct ieee80211_sub_if_data *sdata = rx->sdata;
3960	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
3961
3962	if (!ieee80211_is_action(fc: mgmt->frame_control))
3963	return RX_CONTINUE;
3964
3965	/*
3966	* For AP mode, hostapd is responsible for handling any action
3967	* frames that we didn't handle, including returning unknown
3968	* ones. For all other modes we will return them to the sender,
3969	* setting the 0x80 bit in the action category, as required by
3970	* 802.11-2012 9.24.4.
3971	* Newer versions of hostapd use the management frame registration
3972	* mechanisms and old cooked monitor interface is no longer supported.
3973	*/
3974	if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3975	(sdata->vif.type == NL80211_IFTYPE_AP ||
3976	sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3977	return RX_DROP;
3978
3979	if (is_multicast_ether_addr(addr: mgmt->da))
3980	return RX_DROP;
3981
3982	/* do not return rejected action frames */
3983	if (mgmt->u.action.category & 0x80)
3984	return RX_DROP_U_REJECTED_ACTION_RESPONSE;
3985
3986	nskb = skb_copy_expand(skb: rx->skb, newheadroom: local->hw.extra_tx_headroom, newtailroom: 0,
3987	GFP_ATOMIC);
3988	if (nskb) {
3989	struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3990
3991	nmgmt->u.action.category |= 0x80;
3992	memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3993	memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3994
3995	memset(nskb->cb, 0, sizeof(nskb->cb));
3996
3997	if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3998	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: nskb);
3999
4000	info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
4001	IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
4002	IEEE80211_TX_CTL_NO_CCK_RATE;
4003	if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
4004	info->hw_queue =
4005	local->hw.offchannel_tx_hw_queue;
4006	}
4007
4008	__ieee80211_tx_skb_tid_band(sdata: rx->sdata, skb: nskb, tid: 7, link_id: -1,
4009	band: status->band);
4010	}
4011
4012	return RX_DROP_U_UNKNOWN_ACTION_REJECTED;
4013	}
4014
4015	static ieee80211_rx_result debug_noinline
4016	ieee80211_rx_h_ext(struct ieee80211_rx_data *rx)
4017	{
4018	struct ieee80211_sub_if_data *sdata = rx->sdata;
4019	struct ieee80211_hdr *hdr = (void *)rx->skb->data;
4020
4021	if (!ieee80211_is_ext(fc: hdr->frame_control))
4022	return RX_CONTINUE;
4023
4024	if (sdata->vif.type != NL80211_IFTYPE_STATION)
4025	return RX_DROP;
4026
4027	/* for now only beacons are ext, so queue them */
4028	ieee80211_queue_skb_to_iface(sdata, link_id: rx->link_id, sta: rx->sta, skb: rx->skb);
4029
4030	return RX_QUEUED;
4031	}
4032
4033	static ieee80211_rx_result debug_noinline
4034	ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
4035	{
4036	struct ieee80211_sub_if_data *sdata = rx->sdata;
4037	struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
4038	__le16 stype;
4039
4040	stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
4041
4042	if (!ieee80211_vif_is_mesh(vif: &sdata->vif) &&
4043	sdata->vif.type != NL80211_IFTYPE_ADHOC &&
4044	sdata->vif.type != NL80211_IFTYPE_OCB &&
4045	sdata->vif.type != NL80211_IFTYPE_STATION)
4046	return RX_DROP;
4047
4048	switch (stype) {
4049	case cpu_to_le16(IEEE80211_STYPE_AUTH):
4050	case cpu_to_le16(IEEE80211_STYPE_BEACON):
4051	case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
4052	/* process for all: mesh, mlme, ibss */
4053	break;
4054	case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
4055	if (is_multicast_ether_addr(addr: mgmt->da) &&
4056	!is_broadcast_ether_addr(addr: mgmt->da))
4057	return RX_DROP;
4058
4059	/* process only for station/IBSS */
4060	if (sdata->vif.type != NL80211_IFTYPE_STATION &&
4061	sdata->vif.type != NL80211_IFTYPE_ADHOC)
4062	return RX_DROP;
4063	break;
4064	case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
4065	case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
4066	case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
4067	if (is_multicast_ether_addr(addr: mgmt->da) &&
4068	!is_broadcast_ether_addr(addr: mgmt->da))
4069	return RX_DROP;
4070
4071	/* process only for station */
4072	if (sdata->vif.type != NL80211_IFTYPE_STATION)
4073	return RX_DROP;
4074	break;
4075	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
4076	/* process only for ibss and mesh */
4077	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
4078	sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
4079	return RX_DROP;
4080	break;
4081	default:
4082	return RX_DROP;
4083	}
4084
4085	ieee80211_queue_skb_to_iface(sdata, link_id: rx->link_id, sta: rx->sta, skb: rx->skb);
4086
4087	return RX_QUEUED;
4088	}
4089
4090	static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
4091	ieee80211_rx_result res)
4092	{
4093	if (res == RX_QUEUED) {
4094	I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
4095	return;
4096	}
4097
4098	if (res != RX_CONTINUE) {
4099	I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
4100	if (rx->sta)
4101	rx->link_sta->rx_stats.dropped++;
4102	}
4103
4104	kfree_skb_reason(skb: rx->skb, reason: (__force u32)res);
4105	}
4106
4107	static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
4108	struct sk_buff_head *frames)
4109	{
4110	ieee80211_rx_result res = RX_DROP;
4111	struct sk_buff *skb;
4112
4113	#define CALL_RXH(rxh) \
4114	do { \
4115	res = rxh(rx); \
4116	if (res != RX_CONTINUE) \
4117	goto rxh_next; \
4118	} while (0)
4119
4120	/* Lock here to avoid hitting all of the data used in the RX
4121	* path (e.g. key data, station data, ...) concurrently when
4122	* a frame is released from the reorder buffer due to timeout
4123	* from the timer, potentially concurrently with RX from the
4124	* driver.
4125	*/
4126	spin_lock_bh(lock: &rx->local->rx_path_lock);
4127
4128	while ((skb = __skb_dequeue(list: frames))) {
4129	/*
4130	* all the other fields are valid across frames
4131	* that belong to an aMPDU since they are on the
4132	* same TID from the same station
4133	*/
4134	rx->skb = skb;
4135
4136	if (WARN_ON_ONCE(!rx->link))
4137	goto rxh_next;
4138
4139	CALL_RXH(ieee80211_rx_h_check_more_data);
4140	CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
4141	CALL_RXH(ieee80211_rx_h_sta_process);
4142	CALL_RXH(ieee80211_rx_h_decrypt);
4143	CALL_RXH(ieee80211_rx_h_defragment);
4144	CALL_RXH(ieee80211_rx_h_michael_mic_verify);
4145	/* must be after MMIC verify so header is counted in MPDU mic */
4146	CALL_RXH(ieee80211_rx_h_amsdu);
4147	CALL_RXH(ieee80211_rx_h_data);
4148
4149	/* special treatment -- needs the queue */
4150	res = ieee80211_rx_h_ctrl(rx, frames);
4151	if (res != RX_CONTINUE)
4152	goto rxh_next;
4153
4154	CALL_RXH(ieee80211_rx_h_mgmt_check);
4155	CALL_RXH(ieee80211_rx_h_action);
4156	CALL_RXH(ieee80211_rx_h_userspace_mgmt);
4157	CALL_RXH(ieee80211_rx_h_action_post_userspace);
4158	CALL_RXH(ieee80211_rx_h_action_return);
4159	CALL_RXH(ieee80211_rx_h_ext);
4160	CALL_RXH(ieee80211_rx_h_mgmt);
4161
4162	rxh_next:
4163	ieee80211_rx_handlers_result(rx, res);
4164
4165	#undef CALL_RXH
4166	}
4167
4168	spin_unlock_bh(lock: &rx->local->rx_path_lock);
4169	}
4170
4171	static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
4172	{
4173	struct sk_buff_head reorder_release;
4174	ieee80211_rx_result res = RX_DROP;
4175
4176	__skb_queue_head_init(list: &reorder_release);
4177
4178	#define CALL_RXH(rxh) \
4179	do { \
4180	res = rxh(rx); \
4181	if (res != RX_CONTINUE) \
4182	goto rxh_next; \
4183	} while (0)
4184
4185	CALL_RXH(ieee80211_rx_h_check_dup);
4186	CALL_RXH(ieee80211_rx_h_check);
4187
4188	ieee80211_rx_reorder_ampdu(rx, frames: &reorder_release);
4189
4190	ieee80211_rx_handlers(rx, frames: &reorder_release);
4191	return;
4192
4193	rxh_next:
4194	ieee80211_rx_handlers_result(rx, res);
4195
4196	#undef CALL_RXH
4197	}
4198
4199	static bool
4200	ieee80211_rx_is_valid_sta_link_id(struct ieee80211_sta *sta, u8 link_id)
4201	{
4202	return !!(sta->valid_links & BIT(link_id));
4203	}
4204
4205	static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
4206	u8 link_id)
4207	{
4208	rx->link_id = link_id;
4209	rx->link = rcu_dereference(rx->sdata->link[link_id]);
4210
4211	if (!rx->sta)
4212	return rx->link;
4213
4214	if (!ieee80211_rx_is_valid_sta_link_id(sta: &rx->sta->sta, link_id))
4215	return false;
4216
4217	rx->link_sta = rcu_dereference(rx->sta->link[link_id]);
4218
4219	return rx->link && rx->link_sta;
4220	}
4221
4222	static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
4223	struct sta_info *sta, int link_id)
4224	{
4225	rx->link_id = link_id;
4226	rx->sta = sta;
4227
4228	if (sta) {
4229	rx->local = sta->sdata->local;
4230	if (!rx->sdata)
4231	rx->sdata = sta->sdata;
4232	rx->link_sta = &sta->deflink;
4233	} else {
4234	rx->link_sta = NULL;
4235	}
4236
4237	if (link_id < 0)
4238	rx->link = &rx->sdata->deflink;
4239	else if (!ieee80211_rx_data_set_link(rx, link_id))
4240	return false;
4241
4242	return true;
4243	}
4244
4245	/*
4246	* This function makes calls into the RX path, therefore
4247	* it has to be invoked under RCU read lock.
4248	*/
4249	void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
4250	{
4251	struct sk_buff_head frames;
4252	struct ieee80211_rx_data rx = {
4253	/* This is OK -- must be QoS data frame */
4254	.security_idx = tid,
4255	.seqno_idx = tid,
4256	};
4257	struct tid_ampdu_rx *tid_agg_rx;
4258	int link_id = -1;
4259
4260	/* FIXME: statistics won't be right with this */
4261	if (sta->sta.valid_links)
4262	link_id = ffs(sta->sta.valid_links) - 1;
4263
4264	if (!ieee80211_rx_data_set_sta(rx: &rx, sta, link_id))
4265	return;
4266
4267	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4268	if (!tid_agg_rx)
4269	return;
4270
4271	__skb_queue_head_init(list: &frames);
4272
4273	spin_lock(lock: &tid_agg_rx->reorder_lock);
4274	ieee80211_sta_reorder_release(sdata: sta->sdata, tid_agg_rx, frames: &frames);
4275	spin_unlock(lock: &tid_agg_rx->reorder_lock);
4276
4277	if (!skb_queue_empty(list: &frames)) {
4278	struct ieee80211_event event = {
4279	.type = BA_FRAME_TIMEOUT,
4280	.u.ba.tid = tid,
4281	.u.ba.sta = &sta->sta,
4282	};
4283	drv_event_callback(local: rx.local, sdata: rx.sdata, event: &event);
4284	}
4285
4286	ieee80211_rx_handlers(rx: &rx, frames: &frames);
4287	}
4288
4289	void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
4290	u16 ssn, u64 filtered,
4291	u16 received_mpdus)
4292	{
4293	struct ieee80211_local *local;
4294	struct sta_info *sta;
4295	struct tid_ampdu_rx *tid_agg_rx;
4296	struct sk_buff_head frames;
4297	struct ieee80211_rx_data rx = {
4298	/* This is OK -- must be QoS data frame */
4299	.security_idx = tid,
4300	.seqno_idx = tid,
4301	};
4302	int i, diff;
4303
4304	if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
4305	return;
4306
4307	__skb_queue_head_init(list: &frames);
4308
4309	sta = container_of(pubsta, struct sta_info, sta);
4310
4311	local = sta->sdata->local;
4312	WARN_ONCE(local->hw.max_rx_aggregation_subframes > 64,
4313	"RX BA marker can't support max_rx_aggregation_subframes %u > 64\n",
4314	local->hw.max_rx_aggregation_subframes);
4315
4316	if (!ieee80211_rx_data_set_sta(rx: &rx, sta, link_id: -1))
4317	return;
4318
4319	rcu_read_lock();
4320	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
4321	if (!tid_agg_rx)
4322	goto out;
4323
4324	spin_lock_bh(lock: &tid_agg_rx->reorder_lock);
4325
4326	if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
4327	int release;
4328
4329	/* release all frames in the reorder buffer */
4330	release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
4331	IEEE80211_SN_MODULO;
4332	ieee80211_release_reorder_frames(sdata: sta->sdata, tid_agg_rx,
4333	head_seq_num: release, frames: &frames);
4334	/* update ssn to match received ssn */
4335	tid_agg_rx->head_seq_num = ssn;
4336	} else {
4337	ieee80211_release_reorder_frames(sdata: sta->sdata, tid_agg_rx, head_seq_num: ssn,
4338	frames: &frames);
4339	}
4340
4341	/* handle the case that received ssn is behind the mac ssn.
4342	* it can be tid_agg_rx->buf_size behind and still be valid */
4343	diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
4344	if (diff >= tid_agg_rx->buf_size) {
4345	tid_agg_rx->reorder_buf_filtered = 0;
4346	goto release;
4347	}
4348	filtered = filtered >> diff;
4349	ssn += diff;
4350
4351	/* update bitmap */
4352	for (i = 0; i < tid_agg_rx->buf_size; i++) {
4353	int index = (ssn + i) % tid_agg_rx->buf_size;
4354
4355	tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
4356	if (filtered & BIT_ULL(i))
4357	tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
4358	}
4359
4360	/* now process also frames that the filter marking released */
4361	ieee80211_sta_reorder_release(sdata: sta->sdata, tid_agg_rx, frames: &frames);
4362
4363	release:
4364	spin_unlock_bh(lock: &tid_agg_rx->reorder_lock);
4365
4366	ieee80211_rx_handlers(rx: &rx, frames: &frames);
4367
4368	out:
4369	rcu_read_unlock();
4370	}
4371	EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
4372
4373	/* main receive path */
4374
4375	static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
4376	{
4377	return ether_addr_equal(addr1: raddr, addr2: addr) ||
4378	is_broadcast_ether_addr(addr: raddr);
4379	}
4380
4381	static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
4382	{
4383	struct ieee80211_sub_if_data *sdata = rx->sdata;
4384	struct sk_buff *skb = rx->skb;
4385	struct ieee80211_hdr *hdr = (void *)skb->data;
4386	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4387	u8 *bssid = ieee80211_get_bssid(hdr, len: skb->len, type: sdata->vif.type);
4388	bool multicast = is_multicast_ether_addr(addr: hdr->addr1) ||
4389	ieee80211_is_s1g_beacon(fc: hdr->frame_control);
4390
4391	switch (sdata->vif.type) {
4392	case NL80211_IFTYPE_STATION:
4393	if (!bssid && !sdata->u.mgd.use_4addr)
4394	return false;
4395	if (ieee80211_is_first_frag(seq_ctrl: hdr->seq_ctrl) &&
4396	ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
4397	return false;
4398	if (multicast)
4399	return true;
4400	return ieee80211_is_our_addr(sdata, addr: hdr->addr1, out_link_id: &rx->link_id);
4401	case NL80211_IFTYPE_ADHOC:
4402	if (!bssid)
4403	return false;
4404	if (ether_addr_equal(addr1: sdata->vif.addr, addr2: hdr->addr2) ||
4405	ether_addr_equal(addr1: sdata->u.ibss.bssid, addr2: hdr->addr2) ||
4406	!is_valid_ether_addr(addr: hdr->addr2))
4407	return false;
4408	if (ieee80211_is_beacon(fc: hdr->frame_control))
4409	return true;
4410	if (!ieee80211_bssid_match(raddr: bssid, addr: sdata->u.ibss.bssid))
4411	return false;
4412	if (!multicast &&
4413	!ether_addr_equal(addr1: sdata->vif.addr, addr2: hdr->addr1))
4414	return false;
4415	if (!rx->sta) {
4416	int rate_idx;
4417	if (status->encoding != RX_ENC_LEGACY)
4418	rate_idx = 0; /* TODO: HT/VHT rates */
4419	else
4420	rate_idx = status->rate_idx;
4421	ieee80211_ibss_rx_no_sta(sdata, bssid, addr: hdr->addr2,
4422	BIT(rate_idx));
4423	}
4424	return true;
4425	case NL80211_IFTYPE_OCB:
4426	if (!bssid)
4427	return false;
4428	if (!ieee80211_is_data_present(fc: hdr->frame_control))
4429	return false;
4430	if (!is_broadcast_ether_addr(addr: bssid))
4431	return false;
4432	if (!multicast &&
4433	!ether_addr_equal(addr1: sdata->dev->dev_addr, addr2: hdr->addr1))
4434	return false;
4435	if (!rx->sta) {
4436	int rate_idx;
4437	if (status->encoding != RX_ENC_LEGACY)
4438	rate_idx = 0; /* TODO: HT rates */
4439	else
4440	rate_idx = status->rate_idx;
4441	ieee80211_ocb_rx_no_sta(sdata, bssid, addr: hdr->addr2,
4442	BIT(rate_idx));
4443	}
4444	return true;
4445	case NL80211_IFTYPE_MESH_POINT:
4446	if (ether_addr_equal(addr1: sdata->vif.addr, addr2: hdr->addr2))
4447	return false;
4448	if (multicast)
4449	return true;
4450	return ether_addr_equal(addr1: sdata->vif.addr, addr2: hdr->addr1);
4451	case NL80211_IFTYPE_AP_VLAN:
4452	case NL80211_IFTYPE_AP:
4453	if (!bssid)
4454	return ieee80211_is_our_addr(sdata, addr: hdr->addr1,
4455	out_link_id: &rx->link_id);
4456
4457	if (!is_broadcast_ether_addr(addr: bssid) &&
4458	!ieee80211_is_our_addr(sdata, addr: bssid, NULL)) {
4459	/*
4460	* Accept public action frames even when the
4461	* BSSID doesn't match, this is used for P2P
4462	* and location updates. Note that mac80211
4463	* itself never looks at these frames.
4464	*/
4465	if (!multicast &&
4466	!ieee80211_is_our_addr(sdata, addr: hdr->addr1,
4467	out_link_id: &rx->link_id))
4468	return false;
4469	if (ieee80211_is_public_action(hdr, len: skb->len))
4470	return true;
4471	return ieee80211_is_beacon(fc: hdr->frame_control);
4472	}
4473
4474	if (!ieee80211_has_tods(fc: hdr->frame_control)) {
4475	/* ignore data frames to TDLS-peers */
4476	if (ieee80211_is_data(fc: hdr->frame_control))
4477	return false;
4478	/* ignore action frames to TDLS-peers */
4479	if (ieee80211_is_action(fc: hdr->frame_control) &&
4480	!is_broadcast_ether_addr(addr: bssid) &&
4481	!ether_addr_equal(addr1: bssid, addr2: hdr->addr1))
4482	return false;
4483	}
4484
4485	/*
4486	* 802.11-2016 Table 9-26 says that for data frames, A1 must be
4487	* the BSSID - we've checked that already but may have accepted
4488	* the wildcard (ff:ff:ff:ff:ff:ff).
4489	*
4490	* It also says:
4491	* The BSSID of the Data frame is determined as follows:
4492	* a) If the STA is contained within an AP or is associated
4493	* with an AP, the BSSID is the address currently in use
4494	* by the STA contained in the AP.
4495	*
4496	* So we should not accept data frames with an address that's
4497	* multicast.
4498	*
4499	* Accepting it also opens a security problem because stations
4500	* could encrypt it with the GTK and inject traffic that way.
4501	*/
4502	if (ieee80211_is_data(fc: hdr->frame_control) && multicast)
4503	return false;
4504
4505	return true;
4506	case NL80211_IFTYPE_P2P_DEVICE:
4507	return ieee80211_is_public_action(hdr, len: skb->len) ||
4508	ieee80211_is_probe_req(fc: hdr->frame_control) ||
4509	ieee80211_is_probe_resp(fc: hdr->frame_control) ||
4510	ieee80211_is_beacon(fc: hdr->frame_control) ||
4511	(ieee80211_is_auth(fc: hdr->frame_control) &&
4512	ether_addr_equal(addr1: sdata->vif.addr, addr2: hdr->addr1));
4513	case NL80211_IFTYPE_NAN:
4514	/* Currently no frames on NAN interface are allowed */
4515	return false;
4516	default:
4517	break;
4518	}
4519
4520	WARN_ON_ONCE(1);
4521	return false;
4522	}
4523
4524	void ieee80211_check_fast_rx(struct sta_info *sta)
4525	{
4526	struct ieee80211_sub_if_data *sdata = sta->sdata;
4527	struct ieee80211_local *local = sdata->local;
4528	struct ieee80211_key *key;
4529	struct ieee80211_fast_rx fastrx = {
4530	.dev = sdata->dev,
4531	.vif_type = sdata->vif.type,
4532	.control_port_protocol = sdata->control_port_protocol,
4533	}, *old, *new = NULL;
4534	u32 offload_flags;
4535	bool set_offload = false;
4536	bool assign = false;
4537	bool offload;
4538
4539	/* use sparse to check that we don't return without updating */
4540	__acquire(check_fast_rx);
4541
4542	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
4543	BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
4544	ether_addr_copy(dst: fastrx.rfc1042_hdr, src: rfc1042_header);
4545	ether_addr_copy(dst: fastrx.vif_addr, src: sdata->vif.addr);
4546
4547	fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
4548
4549	/* fast-rx doesn't do reordering */
4550	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
4551	!ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
4552	goto clear;
4553
4554	switch (sdata->vif.type) {
4555	case NL80211_IFTYPE_STATION:
4556	if (sta->sta.tdls) {
4557	fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4558	fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4559	fastrx.expected_ds_bits = 0;
4560	} else {
4561	fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
4562	fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
4563	fastrx.expected_ds_bits =
4564	cpu_to_le16(IEEE80211_FCTL_FROMDS);
4565	}
4566
4567	if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
4568	fastrx.expected_ds_bits |=
4569	cpu_to_le16(IEEE80211_FCTL_TODS);
4570	fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4571	fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4572	}
4573
4574	if (!sdata->u.mgd.powersave)
4575	break;
4576
4577	/* software powersave is a huge mess, avoid all of it */
4578	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4579	goto clear;
4580	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4581	!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4582	goto clear;
4583	break;
4584	case NL80211_IFTYPE_AP_VLAN:
4585	case NL80211_IFTYPE_AP:
4586	/* parallel-rx requires this, at least with calls to
4587	* ieee80211_sta_ps_transition()
4588	*/
4589	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4590	goto clear;
4591	fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4592	fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4593	fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4594
4595	fastrx.internal_forward =
4596	!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4597	(sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4598	!sdata->u.vlan.sta);
4599
4600	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4601	sdata->u.vlan.sta) {
4602	fastrx.expected_ds_bits |=
4603	cpu_to_le16(IEEE80211_FCTL_FROMDS);
4604	fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4605	fastrx.internal_forward = 0;
4606	}
4607
4608	break;
4609	case NL80211_IFTYPE_MESH_POINT:
4610	fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
4611	IEEE80211_FCTL_TODS);
4612	fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4613	fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4614	break;
4615	default:
4616	goto clear;
4617	}
4618
4619	if (!test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED))
4620	goto clear;
4621
4622	rcu_read_lock();
4623	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4624	if (!key)
4625	key = rcu_dereference(sdata->default_unicast_key);
4626	if (key) {
4627	switch (key->conf.cipher) {
4628	case WLAN_CIPHER_SUITE_TKIP:
4629	/* we don't want to deal with MMIC in fast-rx */
4630	goto clear_rcu;
4631	case WLAN_CIPHER_SUITE_CCMP:
4632	case WLAN_CIPHER_SUITE_CCMP_256:
4633	case WLAN_CIPHER_SUITE_GCMP:
4634	case WLAN_CIPHER_SUITE_GCMP_256:
4635	break;
4636	default:
4637	/* We also don't want to deal with
4638	* WEP or cipher scheme.
4639	*/
4640	goto clear_rcu;
4641	}
4642
4643	fastrx.key = true;
4644	fastrx.icv_len = key->conf.icv_len;
4645	}
4646
4647	assign = true;
4648	clear_rcu:
4649	rcu_read_unlock();
4650	clear:
4651	__release(check_fast_rx);
4652
4653	if (assign)
4654	new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4655
4656	offload_flags = get_bss_sdata(sdata)->vif.offload_flags;
4657	offload = offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED;
4658
4659	if (assign && offload)
4660	set_offload = !test_and_set_sta_flag(sta, flag: WLAN_STA_DECAP_OFFLOAD);
4661	else
4662	set_offload = test_and_clear_sta_flag(sta, flag: WLAN_STA_DECAP_OFFLOAD);
4663
4664	if (set_offload)
4665	drv_sta_set_decap_offload(local, sdata, sta: &sta->sta, enabled: assign);
4666
4667	spin_lock_bh(lock: &sta->lock);
4668	old = rcu_dereference_protected(sta->fast_rx, true);
4669	rcu_assign_pointer(sta->fast_rx, new);
4670	spin_unlock_bh(lock: &sta->lock);
4671
4672	if (old)
4673	kfree_rcu(old, rcu_head);
4674	}
4675
4676	void ieee80211_clear_fast_rx(struct sta_info *sta)
4677	{
4678	struct ieee80211_fast_rx *old;
4679
4680	spin_lock_bh(lock: &sta->lock);
4681	old = rcu_dereference_protected(sta->fast_rx, true);
4682	RCU_INIT_POINTER(sta->fast_rx, NULL);
4683	spin_unlock_bh(lock: &sta->lock);
4684
4685	if (old)
4686	kfree_rcu(old, rcu_head);
4687	}
4688
4689	void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4690	{
4691	struct ieee80211_local *local = sdata->local;
4692	struct sta_info *sta;
4693
4694	lockdep_assert_wiphy(local->hw.wiphy);
4695
4696	list_for_each_entry(sta, &local->sta_list, list) {
4697	if (sdata != sta->sdata &&
4698	(!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4699	continue;
4700	ieee80211_check_fast_rx(sta);
4701	}
4702	}
4703
4704	void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4705	{
4706	struct ieee80211_local *local = sdata->local;
4707
4708	lockdep_assert_wiphy(local->hw.wiphy);
4709
4710	__ieee80211_check_fast_rx_iface(sdata);
4711	}
4712
4713	static void ieee80211_rx_8023(struct ieee80211_rx_data *rx,
4714	struct ieee80211_fast_rx *fast_rx,
4715	int orig_len)
4716	{
4717	struct ieee80211_sta_rx_stats *stats;
4718	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb: rx->skb);
4719	struct sta_info *sta = rx->sta;
4720	struct link_sta_info *link_sta;
4721	struct sk_buff *skb = rx->skb;
4722	void *sa = skb->data + ETH_ALEN;
4723	void *da = skb->data;
4724
4725	if (rx->link_id >= 0) {
4726	link_sta = rcu_dereference(sta->link[rx->link_id]);
4727	if (WARN_ON_ONCE(!link_sta)) {
4728	dev_kfree_skb(rx->skb);
4729	return;
4730	}
4731	} else {
4732	link_sta = &sta->deflink;
4733	}
4734
4735	stats = &link_sta->rx_stats;
4736	if (fast_rx->uses_rss)
4737	stats = this_cpu_ptr(link_sta->pcpu_rx_stats);
4738
4739	/* statistics part of ieee80211_rx_h_sta_process() */
4740	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4741	stats->last_signal = status->signal;
4742	if (!fast_rx->uses_rss)
4743	ewma_signal_add(e: &link_sta->rx_stats_avg.signal,
4744	val: -status->signal);
4745	}
4746
4747	if (status->chains) {
4748	int i;
4749
4750	stats->chains = status->chains;
4751	for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4752	int signal = status->chain_signal[i];
4753
4754	if (!(status->chains & BIT(i)))
4755	continue;
4756
4757	stats->chain_signal_last[i] = signal;
4758	if (!fast_rx->uses_rss)
4759	ewma_signal_add(e: &link_sta->rx_stats_avg.chain_signal[i],
4760	val: -signal);
4761	}
4762	}
4763	/* end of statistics */
4764
4765	stats->last_rx = jiffies;
4766	stats->last_rate = sta_stats_encode_rate(s: status);
4767
4768	stats->fragments++;
4769	stats->packets++;
4770
4771	skb->dev = fast_rx->dev;
4772
4773	dev_sw_netstats_rx_add(dev: fast_rx->dev, len: skb->len);
4774
4775	/* The seqno index has the same property as needed
4776	* for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4777	* for non-QoS-data frames. Here we know it's a data
4778	* frame, so count MSDUs.
4779	*/
4780	u64_stats_update_begin(syncp: &stats->syncp);
4781	stats->msdu[rx->seqno_idx]++;
4782	stats->bytes += orig_len;
4783	u64_stats_update_end(syncp: &stats->syncp);
4784
4785	if (fast_rx->internal_forward) {
4786	struct sk_buff *xmit_skb = NULL;
4787	if (is_multicast_ether_addr(addr: da)) {
4788	xmit_skb = skb_copy(skb, GFP_ATOMIC);
4789	} else if (!ether_addr_equal(addr1: da, addr2: sa) &&
4790	sta_info_get(sdata: rx->sdata, addr: da)) {
4791	xmit_skb = skb;
4792	skb = NULL;
4793	}
4794
4795	if (xmit_skb) {
4796	/*
4797	* Send to wireless media and increase priority by 256
4798	* to keep the received priority instead of
4799	* reclassifying the frame (see cfg80211_classify8021d).
4800	*/
4801	xmit_skb->priority += 256;
4802	xmit_skb->protocol = htons(ETH_P_802_3);
4803	skb_reset_network_header(skb: xmit_skb);
4804	skb_reset_mac_header(skb: xmit_skb);
4805	dev_queue_xmit(skb: xmit_skb);
4806	}
4807
4808	if (!skb)
4809	return;
4810	}
4811
4812	/* deliver to local stack */
4813	skb->protocol = eth_type_trans(skb, dev: fast_rx->dev);
4814	ieee80211_deliver_skb_to_local_stack(skb, rx);
4815	}
4816
4817	static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4818	struct ieee80211_fast_rx *fast_rx)
4819	{
4820	struct sk_buff *skb = rx->skb;
4821	struct ieee80211_hdr *hdr = (void *)skb->data;
4822	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4823	static ieee80211_rx_result res;
4824	int orig_len = skb->len;
4825	int hdrlen = ieee80211_hdrlen(fc: hdr->frame_control);
4826	int snap_offs = hdrlen;
4827	struct {
4828	u8 snap[sizeof(rfc1042_header)];
4829	__be16 proto;
4830	} *payload __aligned(2);
4831	struct {
4832	u8 da[ETH_ALEN];
4833	u8 sa[ETH_ALEN];
4834	} addrs __aligned(2);
4835	struct ieee80211_sta_rx_stats *stats;
4836
4837	/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4838	* to a common data structure; drivers can implement that per queue
4839	* but we don't have that information in mac80211
4840	*/
4841	if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4842	return false;
4843
4844	#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4845
4846	/* If using encryption, we also need to have:
4847	* - PN_VALIDATED: similar, but the implementation is tricky
4848	* - DECRYPTED: necessary for PN_VALIDATED
4849	*/
4850	if (fast_rx->key &&
4851	(status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4852	return false;
4853
4854	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4855	return false;
4856
4857	if (unlikely(ieee80211_is_frag(hdr)))
4858	return false;
4859
4860	/* Since our interface address cannot be multicast, this
4861	* implicitly also rejects multicast frames without the
4862	* explicit check.
4863	*
4864	* We shouldn't get any *data* frames not addressed to us
4865	* (AP mode will accept multicast *management* frames), but
4866	* punting here will make it go through the full checks in
4867	* ieee80211_accept_frame().
4868	*/
4869	if (!ether_addr_equal(addr1: fast_rx->vif_addr, addr2: hdr->addr1))
4870	return false;
4871
4872	if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4873	IEEE80211_FCTL_TODS)) !=
4874	fast_rx->expected_ds_bits)
4875	return false;
4876
4877	/* assign the key to drop unencrypted frames (later)
4878	* and strip the IV/MIC if necessary
4879	*/
4880	if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4881	/* GCMP header length is the same */
4882	snap_offs += IEEE80211_CCMP_HDR_LEN;
4883	}
4884
4885	if (!ieee80211_vif_is_mesh(vif: &rx->sdata->vif) &&
4886	!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4887	if (!pskb_may_pull(skb, len: snap_offs + sizeof(*payload)))
4888	return false;
4889
4890	payload = (void *)(skb->data + snap_offs);
4891
4892	if (!ether_addr_equal(addr1: payload->snap, addr2: fast_rx->rfc1042_hdr))
4893	return false;
4894
4895	/* Don't handle these here since they require special code.
4896	* Accept AARP and IPX even though they should come with a
4897	* bridge-tunnel header - but if we get them this way then
4898	* there's little point in discarding them.
4899	*/
4900	if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4901	payload->proto == fast_rx->control_port_protocol))
4902	return false;
4903	}
4904
4905	/* after this point, don't punt to the slowpath! */
4906
4907	if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4908	pskb_trim(skb, len: skb->len - fast_rx->icv_len))
4909	goto drop;
4910
4911	if (rx->key && !ieee80211_has_protected(fc: hdr->frame_control))
4912	goto drop;
4913
4914	if (status->rx_flags & IEEE80211_RX_AMSDU) {
4915	if (__ieee80211_rx_h_amsdu(rx, data_offset: snap_offs - hdrlen) !=
4916	RX_QUEUED)
4917	goto drop;
4918
4919	return true;
4920	}
4921
4922	/* do the header conversion - first grab the addresses */
4923	ether_addr_copy(dst: addrs.da, src: skb->data + fast_rx->da_offs);
4924	ether_addr_copy(dst: addrs.sa, src: skb->data + fast_rx->sa_offs);
4925	if (ieee80211_vif_is_mesh(vif: &rx->sdata->vif)) {
4926	skb_pull(skb, len: snap_offs - 2);
4927	put_unaligned_be16(val: skb->len - 2, p: skb->data);
4928	} else {
4929	skb_postpull_rcsum(skb, start: skb->data + snap_offs,
4930	len: sizeof(rfc1042_header) + 2);
4931
4932	/* remove the SNAP but leave the ethertype */
4933	skb_pull(skb, len: snap_offs + sizeof(rfc1042_header));
4934	}
4935	/* push the addresses in front */
4936	memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4937
4938	res = ieee80211_rx_mesh_data(sdata: rx->sdata, sta: rx->sta, skb: rx->skb);
4939	switch (res) {
4940	case RX_QUEUED:
4941	return true;
4942	case RX_CONTINUE:
4943	break;
4944	default:
4945	goto drop;
4946	}
4947
4948	ieee80211_rx_8023(rx, fast_rx, orig_len);
4949
4950	return true;
4951	drop:
4952	dev_kfree_skb(skb);
4953
4954	if (fast_rx->uses_rss)
4955	stats = this_cpu_ptr(rx->link_sta->pcpu_rx_stats);
4956	else
4957	stats = &rx->link_sta->rx_stats;
4958
4959	stats->dropped++;
4960	return true;
4961	}
4962
4963	/*
4964	* This function returns whether or not the SKB
4965	* was destined for RX processing or not, which,
4966	* if consume is true, is equivalent to whether
4967	* or not the skb was consumed.
4968	*/
4969	static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4970	struct sk_buff *skb, bool consume)
4971	{
4972	struct ieee80211_local *local = rx->local;
4973	struct ieee80211_sub_if_data *sdata = rx->sdata;
4974	struct ieee80211_hdr *hdr = (void *)skb->data;
4975	struct link_sta_info *link_sta = rx->link_sta;
4976	struct ieee80211_link_data *link = rx->link;
4977
4978	rx->skb = skb;
4979
4980	/* See if we can do fast-rx; if we have to copy we already lost,
4981	* so punt in that case. We should never have to deliver a data
4982	* frame to multiple interfaces anyway.
4983	*
4984	* We skip the ieee80211_accept_frame() call and do the necessary
4985	* checking inside ieee80211_invoke_fast_rx().
4986	*/
4987	if (consume && rx->sta) {
4988	struct ieee80211_fast_rx *fast_rx;
4989
4990	fast_rx = rcu_dereference(rx->sta->fast_rx);
4991	if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4992	return true;
4993	}
4994
4995	if (!ieee80211_accept_frame(rx))
4996	return false;
4997
4998	if (!consume) {
4999	struct skb_shared_hwtstamps *shwt;
5000
5001	rx->skb = skb_copy(skb, GFP_ATOMIC);
5002	if (!rx->skb) {
5003	if (net_ratelimit())
5004	wiphy_debug(local->hw.wiphy,
5005	"failed to copy skb for %s\n",
5006	sdata->name);
5007	return true;
5008	}
5009
5010	/* skb_copy() does not copy the hw timestamps, so copy it
5011	* explicitly
5012	*/
5013	shwt = skb_hwtstamps(skb: rx->skb);
5014	shwt->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
5015
5016	/* Update the hdr pointer to the new skb for translation below */
5017	hdr = (struct ieee80211_hdr *)rx->skb->data;
5018	}
5019
5020	if (unlikely(rx->sta && rx->sta->sta.mlo) &&
5021	is_unicast_ether_addr(addr: hdr->addr1) &&
5022	!ieee80211_is_probe_resp(fc: hdr->frame_control) &&
5023	!ieee80211_is_beacon(fc: hdr->frame_control)) {
5024	/* translate to MLD addresses */
5025	if (ether_addr_equal(addr1: link->conf->addr, addr2: hdr->addr1))
5026	ether_addr_copy(dst: hdr->addr1, src: rx->sdata->vif.addr);
5027	if (ether_addr_equal(addr1: link_sta->addr, addr2: hdr->addr2))
5028	ether_addr_copy(dst: hdr->addr2, src: rx->sta->addr);
5029	/* translate A3 only if it's the BSSID */
5030	if (!ieee80211_has_tods(fc: hdr->frame_control) &&
5031	!ieee80211_has_fromds(fc: hdr->frame_control)) {
5032	if (ether_addr_equal(addr1: link_sta->addr, addr2: hdr->addr3))
5033	ether_addr_copy(dst: hdr->addr3, src: rx->sta->addr);
5034	else if (ether_addr_equal(addr1: link->conf->addr, addr2: hdr->addr3))
5035	ether_addr_copy(dst: hdr->addr3, src: rx->sdata->vif.addr);
5036	}
5037	/* not needed for A4 since it can only carry the SA */
5038	}
5039
5040	ieee80211_invoke_rx_handlers(rx);
5041	return true;
5042	}
5043
5044	static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
5045	struct ieee80211_sta *pubsta,
5046	struct sk_buff *skb,
5047	struct list_head *list)
5048	{
5049	struct ieee80211_local *local = hw_to_local(hw);
5050	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5051	struct ieee80211_fast_rx *fast_rx;
5052	struct ieee80211_rx_data rx;
5053	struct sta_info *sta;
5054	int link_id = -1;
5055
5056	memset(&rx, 0, sizeof(rx));
5057	rx.skb = skb;
5058	rx.local = local;
5059	rx.list = list;
5060	rx.link_id = -1;
5061
5062	I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5063
5064	/* drop frame if too short for header */
5065	if (skb->len < sizeof(struct ethhdr))
5066	goto drop;
5067
5068	if (!pubsta)
5069	goto drop;
5070
5071	if (status->link_valid)
5072	link_id = status->link_id;
5073
5074	/*
5075	* TODO: Should the frame be dropped if the right link_id is not
5076	* available? Or may be it is fine in the current form to proceed with
5077	* the frame processing because with frame being in 802.3 format,
5078	* link_id is used only for stats purpose and updating the stats on
5079	* the deflink is fine?
5080	*/
5081	sta = container_of(pubsta, struct sta_info, sta);
5082	if (!ieee80211_rx_data_set_sta(rx: &rx, sta, link_id))
5083	goto drop;
5084
5085	fast_rx = rcu_dereference(rx.sta->fast_rx);
5086	if (!fast_rx)
5087	goto drop;
5088
5089	ieee80211_rx_8023(rx: &rx, fast_rx, orig_len: skb->len);
5090	return;
5091
5092	drop:
5093	dev_kfree_skb(skb);
5094	}
5095
5096	static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
5097	struct sk_buff *skb, bool consume)
5098	{
5099	struct link_sta_info *link_sta;
5100	struct ieee80211_hdr *hdr = (void *)skb->data;
5101	struct sta_info *sta;
5102	int link_id = -1;
5103
5104	/*
5105	* Look up link station first, in case there's a
5106	* chance that they might have a link address that
5107	* is identical to the MLD address, that way we'll
5108	* have the link information if needed.
5109	*/
5110	link_sta = link_sta_info_get_bss(sdata: rx->sdata, addr: hdr->addr2);
5111	if (link_sta) {
5112	sta = link_sta->sta;
5113	link_id = link_sta->link_id;
5114	} else {
5115	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5116
5117	sta = sta_info_get_bss(sdata: rx->sdata, addr: hdr->addr2);
5118	if (status->link_valid)
5119	link_id = status->link_id;
5120	}
5121
5122	if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
5123	return false;
5124
5125	return ieee80211_prepare_and_rx_handle(rx, skb, consume);
5126	}
5127
5128	/*
5129	* This is the actual Rx frames handler. as it belongs to Rx path it must
5130	* be called with rcu_read_lock protection.
5131	*/
5132	static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
5133	struct ieee80211_sta *pubsta,
5134	struct sk_buff *skb,
5135	struct list_head *list)
5136	{
5137	struct ieee80211_local *local = hw_to_local(hw);
5138	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5139	struct ieee80211_sub_if_data *sdata;
5140	struct ieee80211_hdr *hdr;
5141	__le16 fc;
5142	struct ieee80211_rx_data rx;
5143	struct ieee80211_sub_if_data *prev;
5144	struct rhlist_head *tmp;
5145	int err = 0;
5146
5147	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
5148	memset(&rx, 0, sizeof(rx));
5149	rx.skb = skb;
5150	rx.local = local;
5151	rx.list = list;
5152	rx.link_id = -1;
5153
5154	if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
5155	I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
5156
5157	if (ieee80211_is_mgmt(fc)) {
5158	/* drop frame if too short for header */
5159	if (skb->len < ieee80211_hdrlen(fc))
5160	err = -ENOBUFS;
5161	else
5162	err = skb_linearize(skb);
5163	} else {
5164	err = !pskb_may_pull(skb, len: ieee80211_hdrlen(fc));
5165	}
5166
5167	if (err) {
5168	dev_kfree_skb(skb);
5169	return;
5170	}
5171
5172	hdr = (struct ieee80211_hdr *)skb->data;
5173	ieee80211_parse_qos(rx: &rx);
5174	ieee80211_verify_alignment(rx: &rx);
5175
5176	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
5177	ieee80211_is_beacon(hdr->frame_control) ||
5178	ieee80211_is_s1g_beacon(hdr->frame_control)))
5179	ieee80211_scan_rx(local, skb);
5180
5181	if (ieee80211_is_data(fc)) {
5182	struct sta_info *sta, *prev_sta;
5183	int link_id = -1;
5184
5185	if (status->link_valid)
5186	link_id = status->link_id;
5187
5188	if (pubsta) {
5189	sta = container_of(pubsta, struct sta_info, sta);
5190	if (!ieee80211_rx_data_set_sta(rx: &rx, sta, link_id))
5191	goto out;
5192
5193	/*
5194	* In MLO connection, fetch the link_id using addr2
5195	* when the driver does not pass link_id in status.
5196	* When the address translation is already performed by
5197	* driver/hw, the valid link_id must be passed in
5198	* status.
5199	*/
5200
5201	if (!status->link_valid && pubsta->mlo) {
5202	struct link_sta_info *link_sta;
5203
5204	link_sta = link_sta_info_get_bss(sdata: rx.sdata,
5205	addr: hdr->addr2);
5206	if (!link_sta)
5207	goto out;
5208
5209	ieee80211_rx_data_set_link(rx: &rx, link_id: link_sta->link_id);
5210	}
5211
5212	if (ieee80211_prepare_and_rx_handle(rx: &rx, skb, consume: true))
5213	return;
5214	goto out;
5215	}
5216
5217	prev_sta = NULL;
5218
5219	for_each_sta_info(local, hdr->addr2, sta, tmp) {
5220	if (!prev_sta) {
5221	prev_sta = sta;
5222	continue;
5223	}
5224
5225	rx.sdata = prev_sta->sdata;
5226	if (!ieee80211_rx_data_set_sta(rx: &rx, sta: prev_sta, link_id))
5227	goto out;
5228
5229	if (!status->link_valid && prev_sta->sta.mlo)
5230	continue;
5231
5232	ieee80211_prepare_and_rx_handle(rx: &rx, skb, consume: false);
5233
5234	prev_sta = sta;
5235	}
5236
5237	if (prev_sta) {
5238	rx.sdata = prev_sta->sdata;
5239	if (!ieee80211_rx_data_set_sta(rx: &rx, sta: prev_sta, link_id))
5240	goto out;
5241
5242	if (!status->link_valid && prev_sta->sta.mlo)
5243	goto out;
5244
5245	if (ieee80211_prepare_and_rx_handle(rx: &rx, skb, consume: true))
5246	return;
5247	goto out;
5248	}
5249	}
5250
5251	prev = NULL;
5252
5253	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
5254	if (!ieee80211_sdata_running(sdata))
5255	continue;
5256
5257	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
5258	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
5259	continue;
5260
5261	/*
5262	* frame is destined for this interface, but if it's
5263	* not also for the previous one we handle that after
5264	* the loop to avoid copying the SKB once too much
5265	*/
5266
5267	if (!prev) {
5268	prev = sdata;
5269	continue;
5270	}
5271
5272	rx.sdata = prev;
5273	ieee80211_rx_for_interface(rx: &rx, skb, consume: false);
5274
5275	prev = sdata;
5276	}
5277
5278	if (prev) {
5279	rx.sdata = prev;
5280
5281	if (ieee80211_rx_for_interface(rx: &rx, skb, consume: true))
5282	return;
5283	}
5284
5285	out:
5286	dev_kfree_skb(skb);
5287	}
5288
5289	/*
5290	* This is the receive path handler. It is called by a low level driver when an
5291	* 802.11 MPDU is received from the hardware.
5292	*/
5293	void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5294	struct sk_buff *skb, struct list_head *list)
5295	{
5296	struct ieee80211_local *local = hw_to_local(hw);
5297	struct ieee80211_rate *rate = NULL;
5298	struct ieee80211_supported_band *sband;
5299	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
5300	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
5301
5302	WARN_ON_ONCE(softirq_count() == 0);
5303
5304	if (WARN_ON(status->band >= NUM_NL80211_BANDS))
5305	goto drop;
5306
5307	sband = local->hw.wiphy->bands[status->band];
5308	if (WARN_ON(!sband))
5309	goto drop;
5310
5311	/*
5312	* If we're suspending, it is possible although not too likely
5313	* that we'd be receiving frames after having already partially
5314	* quiesced the stack. We can't process such frames then since
5315	* that might, for example, cause stations to be added or other
5316	* driver callbacks be invoked.
5317	*/
5318	if (unlikely(local->quiescing || local->suspended))
5319	goto drop;
5320
5321	/* We might be during a HW reconfig, prevent Rx for the same reason */
5322	if (unlikely(local->in_reconfig))
5323	goto drop;
5324
5325	/*
5326	* The same happens when we're not even started,
5327	* but that's worth a warning.
5328	*/
5329	if (WARN_ON(!local->started))
5330	goto drop;
5331
5332	if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
5333	/*
5334	* Validate the rate, unless a PLCP error means that
5335	* we probably can't have a valid rate here anyway.
5336	*/
5337
5338	switch (status->encoding) {
5339	case RX_ENC_HT:
5340	/*
5341	* rate_idx is MCS index, which can be [0-76]
5342	* as documented on:
5343	*
5344	* https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n
5345	*
5346	* Anything else would be some sort of driver or
5347	* hardware error. The driver should catch hardware
5348	* errors.
5349	*/
5350	if (WARN(status->rate_idx > 76,
5351	"Rate marked as an HT rate but passed "
5352	"status->rate_idx is not "
5353	"an MCS index [0-76]: %d (0x%02x)\n",
5354	status->rate_idx,
5355	status->rate_idx))
5356	goto drop;
5357	break;
5358	case RX_ENC_VHT:
5359	if (WARN_ONCE(status->rate_idx > 11 ||
5360	!status->nss ||
5361	status->nss > 8,
5362	"Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
5363	status->rate_idx, status->nss))
5364	goto drop;
5365	break;
5366	case RX_ENC_HE:
5367	if (WARN_ONCE(status->rate_idx > 11 ||
5368	!status->nss ||
5369	status->nss > 8,
5370	"Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
5371	status->rate_idx, status->nss))
5372	goto drop;
5373	break;
5374	case RX_ENC_EHT:
5375	if (WARN_ONCE(status->rate_idx > 15 ||
5376	!status->nss ||
5377	status->nss > 8 ||
5378	status->eht.gi > NL80211_RATE_INFO_EHT_GI_3_2,
5379	"Rate marked as an EHT rate but data is invalid: MCS:%d, NSS:%d, GI:%d\n",
5380	status->rate_idx, status->nss, status->eht.gi))
5381	goto drop;
5382	break;
5383	default:
5384	WARN_ON_ONCE(1);
5385	fallthrough;
5386	case RX_ENC_LEGACY:
5387	if (WARN_ON(status->rate_idx >= sband->n_bitrates))
5388	goto drop;
5389	rate = &sband->bitrates[status->rate_idx];
5390	}
5391	}
5392
5393	if (WARN_ON_ONCE(status->link_id >= IEEE80211_LINK_UNSPECIFIED))
5394	goto drop;
5395
5396	status->rx_flags = 0;
5397
5398	kcov_remote_start_common(id: skb_get_kcov_handle(skb));
5399
5400	/*
5401	* Frames with failed FCS/PLCP checksum are not returned,
5402	* all other frames are returned without radiotap header
5403	* if it was previously present.
5404	* Also, frames with less than 16 bytes are dropped.
5405	*/
5406	if (!(status->flag & RX_FLAG_8023))
5407	skb = ieee80211_rx_monitor(local, origskb: skb, rate);
5408	if (skb) {
5409	if ((status->flag & RX_FLAG_8023) ||
5410	ieee80211_is_data_present(fc: hdr->frame_control))
5411	ieee80211_tpt_led_trig_rx(local, bytes: skb->len);
5412
5413	if (status->flag & RX_FLAG_8023)
5414	__ieee80211_rx_handle_8023(hw, pubsta, skb, list);
5415	else
5416	__ieee80211_rx_handle_packet(hw, pubsta, skb, list);
5417	}
5418
5419	kcov_remote_stop();
5420	return;
5421	drop:
5422	kfree_skb(skb);
5423	}
5424	EXPORT_SYMBOL(ieee80211_rx_list);
5425
5426	void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
5427	struct sk_buff *skb, struct napi_struct *napi)
5428	{
5429	struct sk_buff *tmp;
5430	LIST_HEAD(list);
5431
5432
5433	/*
5434	* key references and virtual interfaces are protected using RCU
5435	* and this requires that we are in a read-side RCU section during
5436	* receive processing
5437	*/
5438	rcu_read_lock();
5439	ieee80211_rx_list(hw, pubsta, skb, &list);
5440	rcu_read_unlock();
5441
5442	if (!napi) {
5443	netif_receive_skb_list(head: &list);
5444	return;
5445	}
5446
5447	list_for_each_entry_safe(skb, tmp, &list, list) {
5448	skb_list_del_init(skb);
5449	napi_gro_receive(napi, skb);
5450	}
5451	}
5452	EXPORT_SYMBOL(ieee80211_rx_napi);
5453
5454	/* This is a version of the rx handler that can be called from hard irq
5455	* context. Post the skb on the queue and schedule the tasklet */
5456	void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
5457	{
5458	struct ieee80211_local *local = hw_to_local(hw);
5459
5460	BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
5461
5462	skb->pkt_type = IEEE80211_RX_MSG;
5463	skb_queue_tail(list: &local->skb_queue, newsk: skb);
5464	tasklet_schedule(t: &local->tasklet);
5465	}
5466	EXPORT_SYMBOL(ieee80211_rx_irqsafe);
5467