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Linux/net/mac80211/rx.c

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  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) 2018-2019 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/bitops.h>
 21 #include <net/mac80211.h>
 22 #include <net/ieee80211_radiotap.h>
 23 #include <asm/unaligned.h>
 24 
 25 #include "ieee80211_i.h"
 26 #include "driver-ops.h"
 27 #include "led.h"
 28 #include "mesh.h"
 29 #include "wep.h"
 30 #include "wpa.h"
 31 #include "tkip.h"
 32 #include "wme.h"
 33 #include "rate.h"
 34 
 35 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
 36 {
 37         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 38 
 39         u64_stats_update_begin(&tstats->syncp);
 40         tstats->rx_packets++;
 41         tstats->rx_bytes += len;
 42         u64_stats_update_end(&tstats->syncp);
 43 }
 44 
 45 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
 46                                enum nl80211_iftype type)
 47 {
 48         __le16 fc = hdr->frame_control;
 49 
 50         if (ieee80211_is_data(fc)) {
 51                 if (len < 24) /* drop incorrect hdr len (data) */
 52                         return NULL;
 53 
 54                 if (ieee80211_has_a4(fc))
 55                         return NULL;
 56                 if (ieee80211_has_tods(fc))
 57                         return hdr->addr1;
 58                 if (ieee80211_has_fromds(fc))
 59                         return hdr->addr2;
 60 
 61                 return hdr->addr3;
 62         }
 63 
 64         if (ieee80211_is_mgmt(fc)) {
 65                 if (len < 24) /* drop incorrect hdr len (mgmt) */
 66                         return NULL;
 67                 return hdr->addr3;
 68         }
 69 
 70         if (ieee80211_is_ctl(fc)) {
 71                 if (ieee80211_is_pspoll(fc))
 72                         return hdr->addr1;
 73 
 74                 if (ieee80211_is_back_req(fc)) {
 75                         switch (type) {
 76                         case NL80211_IFTYPE_STATION:
 77                                 return hdr->addr2;
 78                         case NL80211_IFTYPE_AP:
 79                         case NL80211_IFTYPE_AP_VLAN:
 80                                 return hdr->addr1;
 81                         default:
 82                                 break; /* fall through to the return */
 83                         }
 84                 }
 85         }
 86 
 87         return NULL;
 88 }
 89 
 90 /*
 91  * monitor mode reception
 92  *
 93  * This function cleans up the SKB, i.e. it removes all the stuff
 94  * only useful for monitoring.
 95  */
 96 static void remove_monitor_info(struct sk_buff *skb,
 97                                 unsigned int present_fcs_len,
 98                                 unsigned int rtap_space)
 99 {
100         if (present_fcs_len)
101                 __pskb_trim(skb, skb->len - present_fcs_len);
102         __pskb_pull(skb, rtap_space);
103 }
104 
105 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
106                                      unsigned int rtap_space)
107 {
108         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
109         struct ieee80211_hdr *hdr;
110 
111         hdr = (void *)(skb->data + rtap_space);
112 
113         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
114                             RX_FLAG_FAILED_PLCP_CRC |
115                             RX_FLAG_ONLY_MONITOR |
116                             RX_FLAG_NO_PSDU))
117                 return true;
118 
119         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
120                 return true;
121 
122         if (ieee80211_is_ctl(hdr->frame_control) &&
123             !ieee80211_is_pspoll(hdr->frame_control) &&
124             !ieee80211_is_back_req(hdr->frame_control))
125                 return true;
126 
127         return false;
128 }
129 
130 static int
131 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
132                              struct ieee80211_rx_status *status,
133                              struct sk_buff *skb)
134 {
135         int len;
136 
137         /* always present fields */
138         len = sizeof(struct ieee80211_radiotap_header) + 8;
139 
140         /* allocate extra bitmaps */
141         if (status->chains)
142                 len += 4 * hweight8(status->chains);
143         /* vendor presence bitmap */
144         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
145                 len += 4;
146 
147         if (ieee80211_have_rx_timestamp(status)) {
148                 len = ALIGN(len, 8);
149                 len += 8;
150         }
151         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
152                 len += 1;
153 
154         /* antenna field, if we don't have per-chain info */
155         if (!status->chains)
156                 len += 1;
157 
158         /* padding for RX_FLAGS if necessary */
159         len = ALIGN(len, 2);
160 
161         if (status->encoding == RX_ENC_HT) /* HT info */
162                 len += 3;
163 
164         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
165                 len = ALIGN(len, 4);
166                 len += 8;
167         }
168 
169         if (status->encoding == RX_ENC_VHT) {
170                 len = ALIGN(len, 2);
171                 len += 12;
172         }
173 
174         if (local->hw.radiotap_timestamp.units_pos >= 0) {
175                 len = ALIGN(len, 8);
176                 len += 12;
177         }
178 
179         if (status->encoding == RX_ENC_HE &&
180             status->flag & RX_FLAG_RADIOTAP_HE) {
181                 len = ALIGN(len, 2);
182                 len += 12;
183                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
184         }
185 
186         if (status->encoding == RX_ENC_HE &&
187             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
188                 len = ALIGN(len, 2);
189                 len += 12;
190                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
191         }
192 
193         if (status->flag & RX_FLAG_NO_PSDU)
194                 len += 1;
195 
196         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
197                 len = ALIGN(len, 2);
198                 len += 4;
199                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
200         }
201 
202         if (status->chains) {
203                 /* antenna and antenna signal fields */
204                 len += 2 * hweight8(status->chains);
205         }
206 
207         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
208                 struct ieee80211_vendor_radiotap *rtap;
209                 int vendor_data_offset = 0;
210 
211                 /*
212                  * The position to look at depends on the existence (or non-
213                  * existence) of other elements, so take that into account...
214                  */
215                 if (status->flag & RX_FLAG_RADIOTAP_HE)
216                         vendor_data_offset +=
217                                 sizeof(struct ieee80211_radiotap_he);
218                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
219                         vendor_data_offset +=
220                                 sizeof(struct ieee80211_radiotap_he_mu);
221                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
222                         vendor_data_offset +=
223                                 sizeof(struct ieee80211_radiotap_lsig);
224 
225                 rtap = (void *)&skb->data[vendor_data_offset];
226 
227                 /* alignment for fixed 6-byte vendor data header */
228                 len = ALIGN(len, 2);
229                 /* vendor data header */
230                 len += 6;
231                 if (WARN_ON(rtap->align == 0))
232                         rtap->align = 1;
233                 len = ALIGN(len, rtap->align);
234                 len += rtap->len + rtap->pad;
235         }
236 
237         return len;
238 }
239 
240 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
241                                          struct sk_buff *skb,
242                                          int rtap_space)
243 {
244         struct {
245                 struct ieee80211_hdr_3addr hdr;
246                 u8 category;
247                 u8 action_code;
248         } __packed __aligned(2) action;
249 
250         if (!sdata)
251                 return;
252 
253         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
254 
255         if (skb->len < rtap_space + sizeof(action) +
256                        VHT_MUMIMO_GROUPS_DATA_LEN)
257                 return;
258 
259         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
260                 return;
261 
262         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
263 
264         if (!ieee80211_is_action(action.hdr.frame_control))
265                 return;
266 
267         if (action.category != WLAN_CATEGORY_VHT)
268                 return;
269 
270         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
271                 return;
272 
273         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
274                 return;
275 
276         skb = skb_copy(skb, GFP_ATOMIC);
277         if (!skb)
278                 return;
279 
280         skb_queue_tail(&sdata->skb_queue, skb);
281         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
282 }
283 
284 /*
285  * ieee80211_add_rx_radiotap_header - add radiotap header
286  *
287  * add a radiotap header containing all the fields which the hardware provided.
288  */
289 static void
290 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
291                                  struct sk_buff *skb,
292                                  struct ieee80211_rate *rate,
293                                  int rtap_len, bool has_fcs)
294 {
295         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
296         struct ieee80211_radiotap_header *rthdr;
297         unsigned char *pos;
298         __le32 *it_present;
299         u32 it_present_val;
300         u16 rx_flags = 0;
301         u16 channel_flags = 0;
302         int mpdulen, chain;
303         unsigned long chains = status->chains;
304         struct ieee80211_vendor_radiotap rtap = {};
305         struct ieee80211_radiotap_he he = {};
306         struct ieee80211_radiotap_he_mu he_mu = {};
307         struct ieee80211_radiotap_lsig lsig = {};
308 
309         if (status->flag & RX_FLAG_RADIOTAP_HE) {
310                 he = *(struct ieee80211_radiotap_he *)skb->data;
311                 skb_pull(skb, sizeof(he));
312                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
313         }
314 
315         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
316                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
317                 skb_pull(skb, sizeof(he_mu));
318         }
319 
320         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
321                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
322                 skb_pull(skb, sizeof(lsig));
323         }
324 
325         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
326                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
327                 /* rtap.len and rtap.pad are undone immediately */
328                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
329         }
330 
331         mpdulen = skb->len;
332         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
333                 mpdulen += FCS_LEN;
334 
335         rthdr = skb_push(skb, rtap_len);
336         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
337         it_present = &rthdr->it_present;
338 
339         /* radiotap header, set always present flags */
340         rthdr->it_len = cpu_to_le16(rtap_len);
341         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
342                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
343                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
344 
345         if (!status->chains)
346                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
347 
348         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
349                 it_present_val |=
350                         BIT(IEEE80211_RADIOTAP_EXT) |
351                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
352                 put_unaligned_le32(it_present_val, it_present);
353                 it_present++;
354                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
355                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
356         }
357 
358         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
359                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
360                                   BIT(IEEE80211_RADIOTAP_EXT);
361                 put_unaligned_le32(it_present_val, it_present);
362                 it_present++;
363                 it_present_val = rtap.present;
364         }
365 
366         put_unaligned_le32(it_present_val, it_present);
367 
368         pos = (void *)(it_present + 1);
369 
370         /* the order of the following fields is important */
371 
372         /* IEEE80211_RADIOTAP_TSFT */
373         if (ieee80211_have_rx_timestamp(status)) {
374                 /* padding */
375                 while ((pos - (u8 *)rthdr) & 7)
376                         *pos++ = 0;
377                 put_unaligned_le64(
378                         ieee80211_calculate_rx_timestamp(local, status,
379                                                          mpdulen, 0),
380                         pos);
381                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
382                 pos += 8;
383         }
384 
385         /* IEEE80211_RADIOTAP_FLAGS */
386         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
387                 *pos |= IEEE80211_RADIOTAP_F_FCS;
388         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
389                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
390         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
391                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
392         pos++;
393 
394         /* IEEE80211_RADIOTAP_RATE */
395         if (!rate || status->encoding != RX_ENC_LEGACY) {
396                 /*
397                  * Without rate information don't add it. If we have,
398                  * MCS information is a separate field in radiotap,
399                  * added below. The byte here is needed as padding
400                  * for the channel though, so initialise it to 0.
401                  */
402                 *pos = 0;
403         } else {
404                 int shift = 0;
405                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
406                 if (status->bw == RATE_INFO_BW_10)
407                         shift = 1;
408                 else if (status->bw == RATE_INFO_BW_5)
409                         shift = 2;
410                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
411         }
412         pos++;
413 
414         /* IEEE80211_RADIOTAP_CHANNEL */
415         put_unaligned_le16(status->freq, pos);
416         pos += 2;
417         if (status->bw == RATE_INFO_BW_10)
418                 channel_flags |= IEEE80211_CHAN_HALF;
419         else if (status->bw == RATE_INFO_BW_5)
420                 channel_flags |= IEEE80211_CHAN_QUARTER;
421 
422         if (status->band == NL80211_BAND_5GHZ)
423                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
424         else if (status->encoding != RX_ENC_LEGACY)
425                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
426         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
427                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
428         else if (rate)
429                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
430         else
431                 channel_flags |= IEEE80211_CHAN_2GHZ;
432         put_unaligned_le16(channel_flags, pos);
433         pos += 2;
434 
435         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
436         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
437             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
438                 *pos = status->signal;
439                 rthdr->it_present |=
440                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
441                 pos++;
442         }
443 
444         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
445 
446         if (!status->chains) {
447                 /* IEEE80211_RADIOTAP_ANTENNA */
448                 *pos = status->antenna;
449                 pos++;
450         }
451 
452         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
453 
454         /* IEEE80211_RADIOTAP_RX_FLAGS */
455         /* ensure 2 byte alignment for the 2 byte field as required */
456         if ((pos - (u8 *)rthdr) & 1)
457                 *pos++ = 0;
458         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
459                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
460         put_unaligned_le16(rx_flags, pos);
461         pos += 2;
462 
463         if (status->encoding == RX_ENC_HT) {
464                 unsigned int stbc;
465 
466                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
467                 *pos++ = local->hw.radiotap_mcs_details;
468                 *pos = 0;
469                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
470                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
471                 if (status->bw == RATE_INFO_BW_40)
472                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
473                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
474                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
475                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
476                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
477                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
478                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
479                 pos++;
480                 *pos++ = status->rate_idx;
481         }
482 
483         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
484                 u16 flags = 0;
485 
486                 /* ensure 4 byte alignment */
487                 while ((pos - (u8 *)rthdr) & 3)
488                         pos++;
489                 rthdr->it_present |=
490                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
491                 put_unaligned_le32(status->ampdu_reference, pos);
492                 pos += 4;
493                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
494                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
495                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
496                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
497                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
498                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
499                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
500                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
501                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
502                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
503                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
504                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
505                 put_unaligned_le16(flags, pos);
506                 pos += 2;
507                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
508                         *pos++ = status->ampdu_delimiter_crc;
509                 else
510                         *pos++ = 0;
511                 *pos++ = 0;
512         }
513 
514         if (status->encoding == RX_ENC_VHT) {
515                 u16 known = local->hw.radiotap_vht_details;
516 
517                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
518                 put_unaligned_le16(known, pos);
519                 pos += 2;
520                 /* flags */
521                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
522                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
523                 /* in VHT, STBC is binary */
524                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
525                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
526                 if (status->enc_flags & RX_ENC_FLAG_BF)
527                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
528                 pos++;
529                 /* bandwidth */
530                 switch (status->bw) {
531                 case RATE_INFO_BW_80:
532                         *pos++ = 4;
533                         break;
534                 case RATE_INFO_BW_160:
535                         *pos++ = 11;
536                         break;
537                 case RATE_INFO_BW_40:
538                         *pos++ = 1;
539                         break;
540                 default:
541                         *pos++ = 0;
542                 }
543                 /* MCS/NSS */
544                 *pos = (status->rate_idx << 4) | status->nss;
545                 pos += 4;
546                 /* coding field */
547                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
548                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
549                 pos++;
550                 /* group ID */
551                 pos++;
552                 /* partial_aid */
553                 pos += 2;
554         }
555 
556         if (local->hw.radiotap_timestamp.units_pos >= 0) {
557                 u16 accuracy = 0;
558                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
559 
560                 rthdr->it_present |=
561                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
562 
563                 /* ensure 8 byte alignment */
564                 while ((pos - (u8 *)rthdr) & 7)
565                         pos++;
566 
567                 put_unaligned_le64(status->device_timestamp, pos);
568                 pos += sizeof(u64);
569 
570                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
571                         accuracy = local->hw.radiotap_timestamp.accuracy;
572                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
573                 }
574                 put_unaligned_le16(accuracy, pos);
575                 pos += sizeof(u16);
576 
577                 *pos++ = local->hw.radiotap_timestamp.units_pos;
578                 *pos++ = flags;
579         }
580 
581         if (status->encoding == RX_ENC_HE &&
582             status->flag & RX_FLAG_RADIOTAP_HE) {
583 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
584 
585                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
586                         he.data6 |= HE_PREP(DATA6_NSTS,
587                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
588                                                       status->enc_flags));
589                         he.data3 |= HE_PREP(DATA3_STBC, 1);
590                 } else {
591                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
592                 }
593 
594 #define CHECK_GI(s) \
595         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
596                      (int)NL80211_RATE_INFO_HE_GI_##s)
597 
598                 CHECK_GI(0_8);
599                 CHECK_GI(1_6);
600                 CHECK_GI(3_2);
601 
602                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
603                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
604                 he.data3 |= HE_PREP(DATA3_CODING,
605                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
606 
607                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
608 
609                 switch (status->bw) {
610                 case RATE_INFO_BW_20:
611                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
612                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
613                         break;
614                 case RATE_INFO_BW_40:
615                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
616                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
617                         break;
618                 case RATE_INFO_BW_80:
619                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
620                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
621                         break;
622                 case RATE_INFO_BW_160:
623                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
624                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
625                         break;
626                 case RATE_INFO_BW_HE_RU:
627 #define CHECK_RU_ALLOC(s) \
628         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
629                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
630 
631                         CHECK_RU_ALLOC(26);
632                         CHECK_RU_ALLOC(52);
633                         CHECK_RU_ALLOC(106);
634                         CHECK_RU_ALLOC(242);
635                         CHECK_RU_ALLOC(484);
636                         CHECK_RU_ALLOC(996);
637                         CHECK_RU_ALLOC(2x996);
638 
639                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
640                                             status->he_ru + 4);
641                         break;
642                 default:
643                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
644                 }
645 
646                 /* ensure 2 byte alignment */
647                 while ((pos - (u8 *)rthdr) & 1)
648                         pos++;
649                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
650                 memcpy(pos, &he, sizeof(he));
651                 pos += sizeof(he);
652         }
653 
654         if (status->encoding == RX_ENC_HE &&
655             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
656                 /* ensure 2 byte alignment */
657                 while ((pos - (u8 *)rthdr) & 1)
658                         pos++;
659                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
660                 memcpy(pos, &he_mu, sizeof(he_mu));
661                 pos += sizeof(he_mu);
662         }
663 
664         if (status->flag & RX_FLAG_NO_PSDU) {
665                 rthdr->it_present |=
666                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
667                 *pos++ = status->zero_length_psdu_type;
668         }
669 
670         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
671                 /* ensure 2 byte alignment */
672                 while ((pos - (u8 *)rthdr) & 1)
673                         pos++;
674                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
675                 memcpy(pos, &lsig, sizeof(lsig));
676                 pos += sizeof(lsig);
677         }
678 
679         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
680                 *pos++ = status->chain_signal[chain];
681                 *pos++ = chain;
682         }
683 
684         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
685                 /* ensure 2 byte alignment for the vendor field as required */
686                 if ((pos - (u8 *)rthdr) & 1)
687                         *pos++ = 0;
688                 *pos++ = rtap.oui[0];
689                 *pos++ = rtap.oui[1];
690                 *pos++ = rtap.oui[2];
691                 *pos++ = rtap.subns;
692                 put_unaligned_le16(rtap.len, pos);
693                 pos += 2;
694                 /* align the actual payload as requested */
695                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
696                         *pos++ = 0;
697                 /* data (and possible padding) already follows */
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(*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, *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, needed_headroom, 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(*origskb, needed_headroom, 0, GFP_ATOMIC);
738 
739                 if (!skb)
740                         return NULL;
741         }
742 
743         /* prepend radiotap information */
744         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
745 
746         skb_reset_mac_header(skb);
747         skb->ip_summed = CHECKSUM_UNNECESSARY;
748         skb->pkt_type = PACKET_OTHERHOST;
749         skb->protocol = htons(ETH_P_802_2);
750 
751         return skb;
752 }
753 
754 /*
755  * This function copies a received frame to all monitor interfaces and
756  * returns a cleaned-up SKB that no longer includes the FCS nor the
757  * radiotap header the driver might have added.
758  */
759 static struct sk_buff *
760 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
761                      struct ieee80211_rate *rate)
762 {
763         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
764         struct ieee80211_sub_if_data *sdata;
765         struct sk_buff *monskb = NULL;
766         int present_fcs_len = 0;
767         unsigned int rtap_space = 0;
768         struct ieee80211_sub_if_data *monitor_sdata =
769                 rcu_dereference(local->monitor_sdata);
770         bool only_monitor = false;
771         unsigned int min_head_len;
772 
773         if (status->flag & RX_FLAG_RADIOTAP_HE)
774                 rtap_space += sizeof(struct ieee80211_radiotap_he);
775 
776         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
777                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
778 
779         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
780                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
781 
782         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
783                 struct ieee80211_vendor_radiotap *rtap =
784                         (void *)(origskb->data + rtap_space);
785 
786                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
787         }
788 
789         min_head_len = rtap_space;
790 
791         /*
792          * First, we may need to make a copy of the skb because
793          *  (1) we need to modify it for radiotap (if not present), and
794          *  (2) the other RX handlers will modify the skb we got.
795          *
796          * We don't need to, of course, if we aren't going to return
797          * the SKB because it has a bad FCS/PLCP checksum.
798          */
799 
800         if (!(status->flag & RX_FLAG_NO_PSDU)) {
801                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
802                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
803                                 /* driver bug */
804                                 WARN_ON(1);
805                                 dev_kfree_skb(origskb);
806                                 return NULL;
807                         }
808                         present_fcs_len = FCS_LEN;
809                 }
810 
811                 /* also consider the hdr->frame_control */
812                 min_head_len += 2;
813         }
814 
815         /* ensure that the expected data elements are in skb head */
816         if (!pskb_may_pull(origskb, min_head_len)) {
817                 dev_kfree_skb(origskb);
818                 return NULL;
819         }
820 
821         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
822 
823         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
824                 if (only_monitor) {
825                         dev_kfree_skb(origskb);
826                         return NULL;
827                 }
828 
829                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
830                 return origskb;
831         }
832 
833         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
834 
835         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
836                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
837                                                  &local->mon_list);
838 
839                 if (!monskb)
840                         monskb = ieee80211_make_monitor_skb(local, &origskb,
841                                                             rate, rtap_space,
842                                                             only_monitor &&
843                                                             last_monitor);
844 
845                 if (monskb) {
846                         struct sk_buff *skb;
847 
848                         if (last_monitor) {
849                                 skb = monskb;
850                                 monskb = NULL;
851                         } else {
852                                 skb = skb_clone(monskb, GFP_ATOMIC);
853                         }
854 
855                         if (skb) {
856                                 skb->dev = sdata->dev;
857                                 ieee80211_rx_stats(skb->dev, skb->len);
858                                 netif_receive_skb(skb);
859                         }
860                 }
861 
862                 if (last_monitor)
863                         break;
864         }
865 
866         /* this happens if last_monitor was erroneously false */
867         dev_kfree_skb(monskb);
868 
869         /* ditto */
870         if (!origskb)
871                 return NULL;
872 
873         remove_monitor_info(origskb, present_fcs_len, rtap_space);
874         return origskb;
875 }
876 
877 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
878 {
879         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
880         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
881         int tid, seqno_idx, security_idx;
882 
883         /* does the frame have a qos control field? */
884         if (ieee80211_is_data_qos(hdr->frame_control)) {
885                 u8 *qc = ieee80211_get_qos_ctl(hdr);
886                 /* frame has qos control */
887                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
888                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
889                         status->rx_flags |= IEEE80211_RX_AMSDU;
890 
891                 seqno_idx = tid;
892                 security_idx = tid;
893         } else {
894                 /*
895                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
896                  *
897                  *      Sequence numbers for management frames, QoS data
898                  *      frames with a broadcast/multicast address in the
899                  *      Address 1 field, and all non-QoS data frames sent
900                  *      by QoS STAs are assigned using an additional single
901                  *      modulo-4096 counter, [...]
902                  *
903                  * We also use that counter for non-QoS STAs.
904                  */
905                 seqno_idx = IEEE80211_NUM_TIDS;
906                 security_idx = 0;
907                 if (ieee80211_is_mgmt(hdr->frame_control))
908                         security_idx = IEEE80211_NUM_TIDS;
909                 tid = 0;
910         }
911 
912         rx->seqno_idx = seqno_idx;
913         rx->security_idx = security_idx;
914         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
915          * For now, set skb->priority to 0 for other cases. */
916         rx->skb->priority = (tid > 7) ? 0 : tid;
917 }
918 
919 /**
920  * DOC: Packet alignment
921  *
922  * Drivers always need to pass packets that are aligned to two-byte boundaries
923  * to the stack.
924  *
925  * Additionally, should, if possible, align the payload data in a way that
926  * guarantees that the contained IP header is aligned to a four-byte
927  * boundary. In the case of regular frames, this simply means aligning the
928  * payload to a four-byte boundary (because either the IP header is directly
929  * contained, or IV/RFC1042 headers that have a length divisible by four are
930  * in front of it).  If the payload data is not properly aligned and the
931  * architecture doesn't support efficient unaligned operations, mac80211
932  * will align the data.
933  *
934  * With A-MSDU frames, however, the payload data address must yield two modulo
935  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
936  * push the IP header further back to a multiple of four again. Thankfully, the
937  * specs were sane enough this time around to require padding each A-MSDU
938  * subframe to a length that is a multiple of four.
939  *
940  * Padding like Atheros hardware adds which is between the 802.11 header and
941  * the payload is not supported, the driver is required to move the 802.11
942  * header to be directly in front of the payload in that case.
943  */
944 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
945 {
946 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
947         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
948 #endif
949 }
950 
951 
952 /* rx handlers */
953 
954 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
955 {
956         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
957 
958         if (is_multicast_ether_addr(hdr->addr1))
959                 return 0;
960 
961         return ieee80211_is_robust_mgmt_frame(skb);
962 }
963 
964 
965 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
966 {
967         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
968 
969         if (!is_multicast_ether_addr(hdr->addr1))
970                 return 0;
971 
972         return ieee80211_is_robust_mgmt_frame(skb);
973 }
974 
975 
976 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
977 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
978 {
979         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
980         struct ieee80211_mmie *mmie;
981         struct ieee80211_mmie_16 *mmie16;
982 
983         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
984                 return -1;
985 
986         if (!ieee80211_is_robust_mgmt_frame(skb))
987                 return -1; /* not a robust management frame */
988 
989         mmie = (struct ieee80211_mmie *)
990                 (skb->data + skb->len - sizeof(*mmie));
991         if (mmie->element_id == WLAN_EID_MMIE &&
992             mmie->length == sizeof(*mmie) - 2)
993                 return le16_to_cpu(mmie->key_id);
994 
995         mmie16 = (struct ieee80211_mmie_16 *)
996                 (skb->data + skb->len - sizeof(*mmie16));
997         if (skb->len >= 24 + sizeof(*mmie16) &&
998             mmie16->element_id == WLAN_EID_MMIE &&
999             mmie16->length == sizeof(*mmie16) - 2)
1000                 return le16_to_cpu(mmie16->key_id);
1001 
1002         return -1;
1003 }
1004 
1005 static int ieee80211_get_keyid(struct sk_buff *skb,
1006                                const struct ieee80211_cipher_scheme *cs)
1007 {
1008         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1009         __le16 fc;
1010         int hdrlen;
1011         int minlen;
1012         u8 key_idx_off;
1013         u8 key_idx_shift;
1014         u8 keyid;
1015 
1016         fc = hdr->frame_control;
1017         hdrlen = ieee80211_hdrlen(fc);
1018 
1019         if (cs) {
1020                 minlen = hdrlen + cs->hdr_len;
1021                 key_idx_off = hdrlen + cs->key_idx_off;
1022                 key_idx_shift = cs->key_idx_shift;
1023         } else {
1024                 /* WEP, TKIP, CCMP and GCMP */
1025                 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1026                 key_idx_off = hdrlen + 3;
1027                 key_idx_shift = 6;
1028         }
1029 
1030         if (unlikely(skb->len < minlen))
1031                 return -EINVAL;
1032 
1033         skb_copy_bits(skb, key_idx_off, &keyid, 1);
1034 
1035         if (cs)
1036                 keyid &= cs->key_idx_mask;
1037         keyid >>= key_idx_shift;
1038 
1039         /* cs could use more than the usual two bits for the keyid */
1040         if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1041                 return -EINVAL;
1042 
1043         return keyid;
1044 }
1045 
1046 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1047 {
1048         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1049         char *dev_addr = rx->sdata->vif.addr;
1050 
1051         if (ieee80211_is_data(hdr->frame_control)) {
1052                 if (is_multicast_ether_addr(hdr->addr1)) {
1053                         if (ieee80211_has_tods(hdr->frame_control) ||
1054                             !ieee80211_has_fromds(hdr->frame_control))
1055                                 return RX_DROP_MONITOR;
1056                         if (ether_addr_equal(hdr->addr3, dev_addr))
1057                                 return RX_DROP_MONITOR;
1058                 } else {
1059                         if (!ieee80211_has_a4(hdr->frame_control))
1060                                 return RX_DROP_MONITOR;
1061                         if (ether_addr_equal(hdr->addr4, dev_addr))
1062                                 return RX_DROP_MONITOR;
1063                 }
1064         }
1065 
1066         /* If there is not an established peer link and this is not a peer link
1067          * establisment frame, beacon or probe, drop the frame.
1068          */
1069 
1070         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1071                 struct ieee80211_mgmt *mgmt;
1072 
1073                 if (!ieee80211_is_mgmt(hdr->frame_control))
1074                         return RX_DROP_MONITOR;
1075 
1076                 if (ieee80211_is_action(hdr->frame_control)) {
1077                         u8 category;
1078 
1079                         /* make sure category field is present */
1080                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1081                                 return RX_DROP_MONITOR;
1082 
1083                         mgmt = (struct ieee80211_mgmt *)hdr;
1084                         category = mgmt->u.action.category;
1085                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1086                             category != WLAN_CATEGORY_SELF_PROTECTED)
1087                                 return RX_DROP_MONITOR;
1088                         return RX_CONTINUE;
1089                 }
1090 
1091                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1092                     ieee80211_is_probe_resp(hdr->frame_control) ||
1093                     ieee80211_is_beacon(hdr->frame_control) ||
1094                     ieee80211_is_auth(hdr->frame_control))
1095                         return RX_CONTINUE;
1096 
1097                 return RX_DROP_MONITOR;
1098         }
1099 
1100         return RX_CONTINUE;
1101 }
1102 
1103 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1104                                               int index)
1105 {
1106         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1107         struct sk_buff *tail = skb_peek_tail(frames);
1108         struct ieee80211_rx_status *status;
1109 
1110         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1111                 return true;
1112 
1113         if (!tail)
1114                 return false;
1115 
1116         status = IEEE80211_SKB_RXCB(tail);
1117         if (status->flag & RX_FLAG_AMSDU_MORE)
1118                 return false;
1119 
1120         return true;
1121 }
1122 
1123 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1124                                             struct tid_ampdu_rx *tid_agg_rx,
1125                                             int index,
1126                                             struct sk_buff_head *frames)
1127 {
1128         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1129         struct sk_buff *skb;
1130         struct ieee80211_rx_status *status;
1131 
1132         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1133 
1134         if (skb_queue_empty(skb_list))
1135                 goto no_frame;
1136 
1137         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1138                 __skb_queue_purge(skb_list);
1139                 goto no_frame;
1140         }
1141 
1142         /* release frames from the reorder ring buffer */
1143         tid_agg_rx->stored_mpdu_num--;
1144         while ((skb = __skb_dequeue(skb_list))) {
1145                 status = IEEE80211_SKB_RXCB(skb);
1146                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1147                 __skb_queue_tail(frames, skb);
1148         }
1149 
1150 no_frame:
1151         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1152         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1153 }
1154 
1155 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1156                                              struct tid_ampdu_rx *tid_agg_rx,
1157                                              u16 head_seq_num,
1158                                              struct sk_buff_head *frames)
1159 {
1160         int index;
1161 
1162         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1163 
1164         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1165                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1166                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1167                                                 frames);
1168         }
1169 }
1170 
1171 /*
1172  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1173  * the skb was added to the buffer longer than this time ago, the earlier
1174  * frames that have not yet been received are assumed to be lost and the skb
1175  * can be released for processing. This may also release other skb's from the
1176  * reorder buffer if there are no additional gaps between the frames.
1177  *
1178  * Callers must hold tid_agg_rx->reorder_lock.
1179  */
1180 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1181 
1182 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1183                                           struct tid_ampdu_rx *tid_agg_rx,
1184                                           struct sk_buff_head *frames)
1185 {
1186         int index, i, j;
1187 
1188         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1189 
1190         /* release the buffer until next missing frame */
1191         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1192         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1193             tid_agg_rx->stored_mpdu_num) {
1194                 /*
1195                  * No buffers ready to be released, but check whether any
1196                  * frames in the reorder buffer have timed out.
1197                  */
1198                 int skipped = 1;
1199                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1200                      j = (j + 1) % tid_agg_rx->buf_size) {
1201                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1202                                 skipped++;
1203                                 continue;
1204                         }
1205                         if (skipped &&
1206                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1207                                         HT_RX_REORDER_BUF_TIMEOUT))
1208                                 goto set_release_timer;
1209 
1210                         /* don't leave incomplete A-MSDUs around */
1211                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1212                              i = (i + 1) % tid_agg_rx->buf_size)
1213                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1214 
1215                         ht_dbg_ratelimited(sdata,
1216                                            "release an RX reorder frame due to timeout on earlier frames\n");
1217                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1218                                                         frames);
1219 
1220                         /*
1221                          * Increment the head seq# also for the skipped slots.
1222                          */
1223                         tid_agg_rx->head_seq_num =
1224                                 (tid_agg_rx->head_seq_num +
1225                                  skipped) & IEEE80211_SN_MASK;
1226                         skipped = 0;
1227                 }
1228         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1229                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1230                                                 frames);
1231                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1232         }
1233 
1234         if (tid_agg_rx->stored_mpdu_num) {
1235                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1236 
1237                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1238                      j = (j + 1) % tid_agg_rx->buf_size) {
1239                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1240                                 break;
1241                 }
1242 
1243  set_release_timer:
1244 
1245                 if (!tid_agg_rx->removed)
1246                         mod_timer(&tid_agg_rx->reorder_timer,
1247                                   tid_agg_rx->reorder_time[j] + 1 +
1248                                   HT_RX_REORDER_BUF_TIMEOUT);
1249         } else {
1250                 del_timer(&tid_agg_rx->reorder_timer);
1251         }
1252 }
1253 
1254 /*
1255  * As this function belongs to the RX path it must be under
1256  * rcu_read_lock protection. It returns false if the frame
1257  * can be processed immediately, true if it was consumed.
1258  */
1259 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1260                                              struct tid_ampdu_rx *tid_agg_rx,
1261                                              struct sk_buff *skb,
1262                                              struct sk_buff_head *frames)
1263 {
1264         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1265         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1266         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1267         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1268         u16 head_seq_num, buf_size;
1269         int index;
1270         bool ret = true;
1271 
1272         spin_lock(&tid_agg_rx->reorder_lock);
1273 
1274         /*
1275          * Offloaded BA sessions have no known starting sequence number so pick
1276          * one from first Rxed frame for this tid after BA was started.
1277          */
1278         if (unlikely(tid_agg_rx->auto_seq)) {
1279                 tid_agg_rx->auto_seq = false;
1280                 tid_agg_rx->ssn = mpdu_seq_num;
1281                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1282         }
1283 
1284         buf_size = tid_agg_rx->buf_size;
1285         head_seq_num = tid_agg_rx->head_seq_num;
1286 
1287         /*
1288          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1289          * be reordered.
1290          */
1291         if (unlikely(!tid_agg_rx->started)) {
1292                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1293                         ret = false;
1294                         goto out;
1295                 }
1296                 tid_agg_rx->started = true;
1297         }
1298 
1299         /* frame with out of date sequence number */
1300         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1301                 dev_kfree_skb(skb);
1302                 goto out;
1303         }
1304 
1305         /*
1306          * If frame the sequence number exceeds our buffering window
1307          * size release some previous frames to make room for this one.
1308          */
1309         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1310                 head_seq_num = ieee80211_sn_inc(
1311                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1312                 /* release stored frames up to new head to stack */
1313                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1314                                                  head_seq_num, frames);
1315         }
1316 
1317         /* Now the new frame is always in the range of the reordering buffer */
1318 
1319         index = mpdu_seq_num % tid_agg_rx->buf_size;
1320 
1321         /* check if we already stored this frame */
1322         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1323                 dev_kfree_skb(skb);
1324                 goto out;
1325         }
1326 
1327         /*
1328          * If the current MPDU is in the right order and nothing else
1329          * is stored we can process it directly, no need to buffer it.
1330          * If it is first but there's something stored, we may be able
1331          * to release frames after this one.
1332          */
1333         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1334             tid_agg_rx->stored_mpdu_num == 0) {
1335                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1336                         tid_agg_rx->head_seq_num =
1337                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1338                 ret = false;
1339                 goto out;
1340         }
1341 
1342         /* put the frame in the reordering buffer */
1343         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1344         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1345                 tid_agg_rx->reorder_time[index] = jiffies;
1346                 tid_agg_rx->stored_mpdu_num++;
1347                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1348         }
1349 
1350  out:
1351         spin_unlock(&tid_agg_rx->reorder_lock);
1352         return ret;
1353 }
1354 
1355 /*
1356  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1357  * true if the MPDU was buffered, false if it should be processed.
1358  */
1359 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1360                                        struct sk_buff_head *frames)
1361 {
1362         struct sk_buff *skb = rx->skb;
1363         struct ieee80211_local *local = rx->local;
1364         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1365         struct sta_info *sta = rx->sta;
1366         struct tid_ampdu_rx *tid_agg_rx;
1367         u16 sc;
1368         u8 tid, ack_policy;
1369 
1370         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1371             is_multicast_ether_addr(hdr->addr1))
1372                 goto dont_reorder;
1373 
1374         /*
1375          * filter the QoS data rx stream according to
1376          * STA/TID and check if this STA/TID is on aggregation
1377          */
1378 
1379         if (!sta)
1380                 goto dont_reorder;
1381 
1382         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1383                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1384         tid = ieee80211_get_tid(hdr);
1385 
1386         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1387         if (!tid_agg_rx) {
1388                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1389                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1390                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1391                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1392                                              WLAN_BACK_RECIPIENT,
1393                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1394                 goto dont_reorder;
1395         }
1396 
1397         /* qos null data frames are excluded */
1398         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1399                 goto dont_reorder;
1400 
1401         /* not part of a BA session */
1402         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1403             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1404                 goto dont_reorder;
1405 
1406         /* new, potentially un-ordered, ampdu frame - process it */
1407 
1408         /* reset session timer */
1409         if (tid_agg_rx->timeout)
1410                 tid_agg_rx->last_rx = jiffies;
1411 
1412         /* if this mpdu is fragmented - terminate rx aggregation session */
1413         sc = le16_to_cpu(hdr->seq_ctrl);
1414         if (sc & IEEE80211_SCTL_FRAG) {
1415                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1416                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1417                 return;
1418         }
1419 
1420         /*
1421          * No locking needed -- we will only ever process one
1422          * RX packet at a time, and thus own tid_agg_rx. All
1423          * other code manipulating it needs to (and does) make
1424          * sure that we cannot get to it any more before doing
1425          * anything with it.
1426          */
1427         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1428                                              frames))
1429                 return;
1430 
1431  dont_reorder:
1432         __skb_queue_tail(frames, skb);
1433 }
1434 
1435 static ieee80211_rx_result debug_noinline
1436 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1437 {
1438         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1439         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1440 
1441         if (status->flag & RX_FLAG_DUP_VALIDATED)
1442                 return RX_CONTINUE;
1443 
1444         /*
1445          * Drop duplicate 802.11 retransmissions
1446          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1447          */
1448 
1449         if (rx->skb->len < 24)
1450                 return RX_CONTINUE;
1451 
1452         if (ieee80211_is_ctl(hdr->frame_control) ||
1453             ieee80211_is_nullfunc(hdr->frame_control) ||
1454             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1455             is_multicast_ether_addr(hdr->addr1))
1456                 return RX_CONTINUE;
1457 
1458         if (!rx->sta)
1459                 return RX_CONTINUE;
1460 
1461         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1462                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1463                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1464                 rx->sta->rx_stats.num_duplicates++;
1465                 return RX_DROP_UNUSABLE;
1466         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1467                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1468         }
1469 
1470         return RX_CONTINUE;
1471 }
1472 
1473 static ieee80211_rx_result debug_noinline
1474 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1475 {
1476         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1477 
1478         /* Drop disallowed frame classes based on STA auth/assoc state;
1479          * IEEE 802.11, Chap 5.5.
1480          *
1481          * mac80211 filters only based on association state, i.e. it drops
1482          * Class 3 frames from not associated stations. hostapd sends
1483          * deauth/disassoc frames when needed. In addition, hostapd is
1484          * responsible for filtering on both auth and assoc states.
1485          */
1486 
1487         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1488                 return ieee80211_rx_mesh_check(rx);
1489 
1490         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1491                       ieee80211_is_pspoll(hdr->frame_control)) &&
1492                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1493                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1494                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1495                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1496                 /*
1497                  * accept port control frames from the AP even when it's not
1498                  * yet marked ASSOC to prevent a race where we don't set the
1499                  * assoc bit quickly enough before it sends the first frame
1500                  */
1501                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1502                     ieee80211_is_data_present(hdr->frame_control)) {
1503                         unsigned int hdrlen;
1504                         __be16 ethertype;
1505 
1506                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1507 
1508                         if (rx->skb->len < hdrlen + 8)
1509                                 return RX_DROP_MONITOR;
1510 
1511                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1512                         if (ethertype == rx->sdata->control_port_protocol)
1513                                 return RX_CONTINUE;
1514                 }
1515 
1516                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1517                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1518                                                hdr->addr2,
1519                                                GFP_ATOMIC))
1520                         return RX_DROP_UNUSABLE;
1521 
1522                 return RX_DROP_MONITOR;
1523         }
1524 
1525         return RX_CONTINUE;
1526 }
1527 
1528 
1529 static ieee80211_rx_result debug_noinline
1530 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1531 {
1532         struct ieee80211_local *local;
1533         struct ieee80211_hdr *hdr;
1534         struct sk_buff *skb;
1535 
1536         local = rx->local;
1537         skb = rx->skb;
1538         hdr = (struct ieee80211_hdr *) skb->data;
1539 
1540         if (!local->pspolling)
1541                 return RX_CONTINUE;
1542 
1543         if (!ieee80211_has_fromds(hdr->frame_control))
1544                 /* this is not from AP */
1545                 return RX_CONTINUE;
1546 
1547         if (!ieee80211_is_data(hdr->frame_control))
1548                 return RX_CONTINUE;
1549 
1550         if (!ieee80211_has_moredata(hdr->frame_control)) {
1551                 /* AP has no more frames buffered for us */
1552                 local->pspolling = false;
1553                 return RX_CONTINUE;
1554         }
1555 
1556         /* more data bit is set, let's request a new frame from the AP */
1557         ieee80211_send_pspoll(local, rx->sdata);
1558 
1559         return RX_CONTINUE;
1560 }
1561 
1562 static void sta_ps_start(struct sta_info *sta)
1563 {
1564         struct ieee80211_sub_if_data *sdata = sta->sdata;
1565         struct ieee80211_local *local = sdata->local;
1566         struct ps_data *ps;
1567         int tid;
1568 
1569         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1570             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1571                 ps = &sdata->bss->ps;
1572         else
1573                 return;
1574 
1575         atomic_inc(&ps->num_sta_ps);
1576         set_sta_flag(sta, WLAN_STA_PS_STA);
1577         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1578                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1579         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1580                sta->sta.addr, sta->sta.aid);
1581 
1582         ieee80211_clear_fast_xmit(sta);
1583 
1584         if (!sta->sta.txq[0])
1585                 return;
1586 
1587         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1588                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1589                 struct txq_info *txqi = to_txq_info(txq);
1590 
1591                 spin_lock(&local->active_txq_lock[txq->ac]);
1592                 if (!list_empty(&txqi->schedule_order))
1593                         list_del_init(&txqi->schedule_order);
1594                 spin_unlock(&local->active_txq_lock[txq->ac]);
1595 
1596                 if (txq_has_queue(txq))
1597                         set_bit(tid, &sta->txq_buffered_tids);
1598                 else
1599                         clear_bit(tid, &sta->txq_buffered_tids);
1600         }
1601 }
1602 
1603 static void sta_ps_end(struct sta_info *sta)
1604 {
1605         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1606                sta->sta.addr, sta->sta.aid);
1607 
1608         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1609                 /*
1610                  * Clear the flag only if the other one is still set
1611                  * so that the TX path won't start TX'ing new frames
1612                  * directly ... In the case that the driver flag isn't
1613                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1614                  */
1615                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1616                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1617                        sta->sta.addr, sta->sta.aid);
1618                 return;
1619         }
1620 
1621         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1622         clear_sta_flag(sta, WLAN_STA_PS_STA);
1623         ieee80211_sta_ps_deliver_wakeup(sta);
1624 }
1625 
1626 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1627 {
1628         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1629         bool in_ps;
1630 
1631         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1632 
1633         /* Don't let the same PS state be set twice */
1634         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1635         if ((start && in_ps) || (!start && !in_ps))
1636                 return -EINVAL;
1637 
1638         if (start)
1639                 sta_ps_start(sta);
1640         else
1641                 sta_ps_end(sta);
1642 
1643         return 0;
1644 }
1645 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1646 
1647 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1648 {
1649         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1650 
1651         if (test_sta_flag(sta, WLAN_STA_SP))
1652                 return;
1653 
1654         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1655                 ieee80211_sta_ps_deliver_poll_response(sta);
1656         else
1657                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1658 }
1659 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1660 
1661 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1662 {
1663         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1664         int ac = ieee80211_ac_from_tid(tid);
1665 
1666         /*
1667          * If this AC is not trigger-enabled do nothing unless the
1668          * driver is calling us after it already checked.
1669          *
1670          * NB: This could/should check a separate bitmap of trigger-
1671          * enabled queues, but for now we only implement uAPSD w/o
1672          * TSPEC changes to the ACs, so they're always the same.
1673          */
1674         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1675             tid != IEEE80211_NUM_TIDS)
1676                 return;
1677 
1678         /* if we are in a service period, do nothing */
1679         if (test_sta_flag(sta, WLAN_STA_SP))
1680                 return;
1681 
1682         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1683                 ieee80211_sta_ps_deliver_uapsd(sta);
1684         else
1685                 set_sta_flag(sta, WLAN_STA_UAPSD);
1686 }
1687 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1688 
1689 static ieee80211_rx_result debug_noinline
1690 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1691 {
1692         struct ieee80211_sub_if_data *sdata = rx->sdata;
1693         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1694         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1695 
1696         if (!rx->sta)
1697                 return RX_CONTINUE;
1698 
1699         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1700             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1701                 return RX_CONTINUE;
1702 
1703         /*
1704          * The device handles station powersave, so don't do anything about
1705          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1706          * it to mac80211 since they're handled.)
1707          */
1708         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1709                 return RX_CONTINUE;
1710 
1711         /*
1712          * Don't do anything if the station isn't already asleep. In
1713          * the uAPSD case, the station will probably be marked asleep,
1714          * in the PS-Poll case the station must be confused ...
1715          */
1716         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1717                 return RX_CONTINUE;
1718 
1719         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1720                 ieee80211_sta_pspoll(&rx->sta->sta);
1721 
1722                 /* Free PS Poll skb here instead of returning RX_DROP that would
1723                  * count as an dropped frame. */
1724                 dev_kfree_skb(rx->skb);
1725 
1726                 return RX_QUEUED;
1727         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1728                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1729                    ieee80211_has_pm(hdr->frame_control) &&
1730                    (ieee80211_is_data_qos(hdr->frame_control) ||
1731                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1732                 u8 tid = ieee80211_get_tid(hdr);
1733 
1734                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1735         }
1736 
1737         return RX_CONTINUE;
1738 }
1739 
1740 static ieee80211_rx_result debug_noinline
1741 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1742 {
1743         struct sta_info *sta = rx->sta;
1744         struct sk_buff *skb = rx->skb;
1745         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1746         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1747         int i;
1748 
1749         if (!sta)
1750                 return RX_CONTINUE;
1751 
1752         /*
1753          * Update last_rx only for IBSS packets which are for the current
1754          * BSSID and for station already AUTHORIZED to avoid keeping the
1755          * current IBSS network alive in cases where other STAs start
1756          * using different BSSID. This will also give the station another
1757          * chance to restart the authentication/authorization in case
1758          * something went wrong the first time.
1759          */
1760         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1761                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1762                                                 NL80211_IFTYPE_ADHOC);
1763                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1764                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1765                         sta->rx_stats.last_rx = jiffies;
1766                         if (ieee80211_is_data(hdr->frame_control) &&
1767                             !is_multicast_ether_addr(hdr->addr1))
1768                                 sta->rx_stats.last_rate =
1769                                         sta_stats_encode_rate(status);
1770                 }
1771         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1772                 sta->rx_stats.last_rx = jiffies;
1773         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1774                 /*
1775                  * Mesh beacons will update last_rx when if they are found to
1776                  * match the current local configuration when processed.
1777                  */
1778                 sta->rx_stats.last_rx = jiffies;
1779                 if (ieee80211_is_data(hdr->frame_control))
1780                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1781         }
1782 
1783         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1784                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1785 
1786         sta->rx_stats.fragments++;
1787 
1788         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1789         sta->rx_stats.bytes += rx->skb->len;
1790         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1791 
1792         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1793                 sta->rx_stats.last_signal = status->signal;
1794                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1795         }
1796 
1797         if (status->chains) {
1798                 sta->rx_stats.chains = status->chains;
1799                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1800                         int signal = status->chain_signal[i];
1801 
1802                         if (!(status->chains & BIT(i)))
1803                                 continue;
1804 
1805                         sta->rx_stats.chain_signal_last[i] = signal;
1806                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1807                                         -signal);
1808                 }
1809         }
1810 
1811         /*
1812          * Change STA power saving mode only at the end of a frame
1813          * exchange sequence, and only for a data or management
1814          * frame as specified in IEEE 802.11-2016 11.2.3.2
1815          */
1816         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1817             !ieee80211_has_morefrags(hdr->frame_control) &&
1818             !is_multicast_ether_addr(hdr->addr1) &&
1819             (ieee80211_is_mgmt(hdr->frame_control) ||
1820              ieee80211_is_data(hdr->frame_control)) &&
1821             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1822             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1823              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1824                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1825                         if (!ieee80211_has_pm(hdr->frame_control))
1826                                 sta_ps_end(sta);
1827                 } else {
1828                         if (ieee80211_has_pm(hdr->frame_control))
1829                                 sta_ps_start(sta);
1830                 }
1831         }
1832 
1833         /* mesh power save support */
1834         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1835                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1836 
1837         /*
1838          * Drop (qos-)data::nullfunc frames silently, since they
1839          * are used only to control station power saving mode.
1840          */
1841         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1842             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1843                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1844 
1845                 /*
1846                  * If we receive a 4-addr nullfunc frame from a STA
1847                  * that was not moved to a 4-addr STA vlan yet send
1848                  * the event to userspace and for older hostapd drop
1849                  * the frame to the monitor interface.
1850                  */
1851                 if (ieee80211_has_a4(hdr->frame_control) &&
1852                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1853                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1854                       !rx->sdata->u.vlan.sta))) {
1855                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1856                                 cfg80211_rx_unexpected_4addr_frame(
1857                                         rx->sdata->dev, sta->sta.addr,
1858                                         GFP_ATOMIC);
1859                         return RX_DROP_MONITOR;
1860                 }
1861                 /*
1862                  * Update counter and free packet here to avoid
1863                  * counting this as a dropped packed.
1864                  */
1865                 sta->rx_stats.packets++;
1866                 dev_kfree_skb(rx->skb);
1867                 return RX_QUEUED;
1868         }
1869 
1870         return RX_CONTINUE;
1871 } /* ieee80211_rx_h_sta_process */
1872 
1873 static ieee80211_rx_result debug_noinline
1874 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1875 {
1876         struct sk_buff *skb = rx->skb;
1877         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1878         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1879         int keyidx;
1880         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1881         struct ieee80211_key *sta_ptk = NULL;
1882         struct ieee80211_key *ptk_idx = NULL;
1883         int mmie_keyidx = -1;
1884         __le16 fc;
1885         const struct ieee80211_cipher_scheme *cs = NULL;
1886 
1887         /*
1888          * Key selection 101
1889          *
1890          * There are four types of keys:
1891          *  - GTK (group keys)
1892          *  - IGTK (group keys for management frames)
1893          *  - PTK (pairwise keys)
1894          *  - STK (station-to-station pairwise keys)
1895          *
1896          * When selecting a key, we have to distinguish between multicast
1897          * (including broadcast) and unicast frames, the latter can only
1898          * use PTKs and STKs while the former always use GTKs and IGTKs.
1899          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1900          * unicast frames can also use key indices like GTKs. Hence, if we
1901          * don't have a PTK/STK we check the key index for a WEP key.
1902          *
1903          * Note that in a regular BSS, multicast frames are sent by the
1904          * AP only, associated stations unicast the frame to the AP first
1905          * which then multicasts it on their behalf.
1906          *
1907          * There is also a slight problem in IBSS mode: GTKs are negotiated
1908          * with each station, that is something we don't currently handle.
1909          * The spec seems to expect that one negotiates the same key with
1910          * every station but there's no such requirement; VLANs could be
1911          * possible.
1912          */
1913 
1914         /* start without a key */
1915         rx->key = NULL;
1916         fc = hdr->frame_control;
1917 
1918         if (rx->sta) {
1919                 int keyid = rx->sta->ptk_idx;
1920                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1921 
1922                 if (ieee80211_has_protected(fc)) {
1923                         cs = rx->sta->cipher_scheme;
1924                         keyid = ieee80211_get_keyid(rx->skb, cs);
1925 
1926                         if (unlikely(keyid < 0))
1927                                 return RX_DROP_UNUSABLE;
1928 
1929                         ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
1930                 }
1931         }
1932 
1933         if (!ieee80211_has_protected(fc))
1934                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1935 
1936         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1937                 rx->key = ptk_idx ? ptk_idx : sta_ptk;
1938                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1939                     (status->flag & RX_FLAG_IV_STRIPPED))
1940                         return RX_CONTINUE;
1941                 /* Skip decryption if the frame is not protected. */
1942                 if (!ieee80211_has_protected(fc))
1943                         return RX_CONTINUE;
1944         } else if (mmie_keyidx >= 0) {
1945                 /* Broadcast/multicast robust management frame / BIP */
1946                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1947                     (status->flag & RX_FLAG_IV_STRIPPED))
1948                         return RX_CONTINUE;
1949 
1950                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1951                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1952                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1953                 if (rx->sta) {
1954                         if (ieee80211_is_group_privacy_action(skb) &&
1955                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1956                                 return RX_DROP_MONITOR;
1957 
1958                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1959                 }
1960                 if (!rx->key)
1961                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1962         } else if (!ieee80211_has_protected(fc)) {
1963                 /*
1964                  * The frame was not protected, so skip decryption. However, we
1965                  * need to set rx->key if there is a key that could have been
1966                  * used so that the frame may be dropped if encryption would
1967                  * have been expected.
1968                  */
1969                 struct ieee80211_key *key = NULL;
1970                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1971                 int i;
1972 
1973                 if (ieee80211_is_mgmt(fc) &&
1974                     is_multicast_ether_addr(hdr->addr1) &&
1975                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1976                         rx->key = key;
1977                 else {
1978                         if (rx->sta) {
1979                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1980                                         key = rcu_dereference(rx->sta->gtk[i]);
1981                                         if (key)
1982                                                 break;
1983                                 }
1984                         }
1985                         if (!key) {
1986                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1987                                         key = rcu_dereference(sdata->keys[i]);
1988                                         if (key)
1989                                                 break;
1990                                 }
1991                         }
1992                         if (key)
1993                                 rx->key = key;
1994                 }
1995                 return RX_CONTINUE;
1996         } else {
1997                 /*
1998                  * The device doesn't give us the IV so we won't be
1999                  * able to look up the key. That's ok though, we
2000                  * don't need to decrypt the frame, we just won't
2001                  * be able to keep statistics accurate.
2002                  * Except for key threshold notifications, should
2003                  * we somehow allow the driver to tell us which key
2004                  * the hardware used if this flag is set?
2005                  */
2006                 if ((status->flag & RX_FLAG_DECRYPTED) &&
2007                     (status->flag & RX_FLAG_IV_STRIPPED))
2008                         return RX_CONTINUE;
2009 
2010                 keyidx = ieee80211_get_keyid(rx->skb, cs);
2011 
2012                 if (unlikely(keyidx < 0))
2013                         return RX_DROP_UNUSABLE;
2014 
2015                 /* check per-station GTK first, if multicast packet */
2016                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2017                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2018 
2019                 /* if not found, try default key */
2020                 if (!rx->key) {
2021                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2022 
2023                         /*
2024                          * RSNA-protected unicast frames should always be
2025                          * sent with pairwise or station-to-station keys,
2026                          * but for WEP we allow using a key index as well.
2027                          */
2028                         if (rx->key &&
2029                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2030                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2031                             !is_multicast_ether_addr(hdr->addr1))
2032                                 rx->key = NULL;
2033                 }
2034         }
2035 
2036         if (rx->key) {
2037                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2038                         return RX_DROP_MONITOR;
2039 
2040                 /* TODO: add threshold stuff again */
2041         } else {
2042                 return RX_DROP_MONITOR;
2043         }
2044 
2045         switch (rx->key->conf.cipher) {
2046         case WLAN_CIPHER_SUITE_WEP40:
2047         case WLAN_CIPHER_SUITE_WEP104:
2048                 result = ieee80211_crypto_wep_decrypt(rx);
2049                 break;
2050         case WLAN_CIPHER_SUITE_TKIP:
2051                 result = ieee80211_crypto_tkip_decrypt(rx);
2052                 break;
2053         case WLAN_CIPHER_SUITE_CCMP:
2054                 result = ieee80211_crypto_ccmp_decrypt(
2055                         rx, IEEE80211_CCMP_MIC_LEN);
2056                 break;
2057         case WLAN_CIPHER_SUITE_CCMP_256:
2058                 result = ieee80211_crypto_ccmp_decrypt(
2059                         rx, IEEE80211_CCMP_256_MIC_LEN);
2060                 break;
2061         case WLAN_CIPHER_SUITE_AES_CMAC:
2062                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2063                 break;
2064         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2065                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2066                 break;
2067         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2068         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2069                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2070                 break;
2071         case WLAN_CIPHER_SUITE_GCMP:
2072         case WLAN_CIPHER_SUITE_GCMP_256:
2073                 result = ieee80211_crypto_gcmp_decrypt(rx);
2074                 break;
2075         default:
2076                 result = ieee80211_crypto_hw_decrypt(rx);
2077         }
2078 
2079         /* the hdr variable is invalid after the decrypt handlers */
2080 
2081         /* either the frame has been decrypted or will be dropped */
2082         status->flag |= RX_FLAG_DECRYPTED;
2083 
2084         return result;
2085 }
2086 
2087 static inline struct ieee80211_fragment_entry *
2088 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2089                          unsigned int frag, unsigned int seq, int rx_queue,
2090                          struct sk_buff **skb)
2091 {
2092         struct ieee80211_fragment_entry *entry;
2093 
2094         entry = &sdata->fragments[sdata->fragment_next++];
2095         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2096                 sdata->fragment_next = 0;
2097 
2098         if (!skb_queue_empty(&entry->skb_list))
2099                 __skb_queue_purge(&entry->skb_list);
2100 
2101         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2102         *skb = NULL;
2103         entry->first_frag_time = jiffies;
2104         entry->seq = seq;
2105         entry->rx_queue = rx_queue;
2106         entry->last_frag = frag;
2107         entry->check_sequential_pn = false;
2108         entry->extra_len = 0;
2109 
2110         return entry;
2111 }
2112 
2113 static inline struct ieee80211_fragment_entry *
2114 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2115                           unsigned int frag, unsigned int seq,
2116                           int rx_queue, struct ieee80211_hdr *hdr)
2117 {
2118         struct ieee80211_fragment_entry *entry;
2119         int i, idx;
2120 
2121         idx = sdata->fragment_next;
2122         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2123                 struct ieee80211_hdr *f_hdr;
2124                 struct sk_buff *f_skb;
2125 
2126                 idx--;
2127                 if (idx < 0)
2128                         idx = IEEE80211_FRAGMENT_MAX - 1;
2129 
2130                 entry = &sdata->fragments[idx];
2131                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2132                     entry->rx_queue != rx_queue ||
2133                     entry->last_frag + 1 != frag)
2134                         continue;
2135 
2136                 f_skb = __skb_peek(&entry->skb_list);
2137                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2138 
2139                 /*
2140                  * Check ftype and addresses are equal, else check next fragment
2141                  */
2142                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2143                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2144                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2145                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2146                         continue;
2147 
2148                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2149                         __skb_queue_purge(&entry->skb_list);
2150                         continue;
2151                 }
2152                 return entry;
2153         }
2154 
2155         return NULL;
2156 }
2157 
2158 static ieee80211_rx_result debug_noinline
2159 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2160 {
2161         struct ieee80211_hdr *hdr;
2162         u16 sc;
2163         __le16 fc;
2164         unsigned int frag, seq;
2165         struct ieee80211_fragment_entry *entry;
2166         struct sk_buff *skb;
2167 
2168         hdr = (struct ieee80211_hdr *)rx->skb->data;
2169         fc = hdr->frame_control;
2170 
2171         if (ieee80211_is_ctl(fc))
2172                 return RX_CONTINUE;
2173 
2174         sc = le16_to_cpu(hdr->seq_ctrl);
2175         frag = sc & IEEE80211_SCTL_FRAG;
2176 
2177         if (is_multicast_ether_addr(hdr->addr1)) {
2178                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2179                 goto out_no_led;
2180         }
2181 
2182         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2183                 goto out;
2184 
2185         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2186 
2187         if (skb_linearize(rx->skb))
2188                 return RX_DROP_UNUSABLE;
2189 
2190         /*
2191          *  skb_linearize() might change the skb->data and
2192          *  previously cached variables (in this case, hdr) need to
2193          *  be refreshed with the new data.
2194          */
2195         hdr = (struct ieee80211_hdr *)rx->skb->data;
2196         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2197 
2198         if (frag == 0) {
2199                 /* This is the first fragment of a new frame. */
2200                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2201                                                  rx->seqno_idx, &(rx->skb));
2202                 if (rx->key &&
2203                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2204                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2205                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2206                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2207                     ieee80211_has_protected(fc)) {
2208                         int queue = rx->security_idx;
2209 
2210                         /* Store CCMP/GCMP PN so that we can verify that the
2211                          * next fragment has a sequential PN value.
2212                          */
2213                         entry->check_sequential_pn = true;
2214                         memcpy(entry->last_pn,
2215                                rx->key->u.ccmp.rx_pn[queue],
2216                                IEEE80211_CCMP_PN_LEN);
2217                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2218                                               u.ccmp.rx_pn) !=
2219                                      offsetof(struct ieee80211_key,
2220                                               u.gcmp.rx_pn));
2221                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2222                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2223                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2224                                      IEEE80211_GCMP_PN_LEN);
2225                 }
2226                 return RX_QUEUED;
2227         }
2228 
2229         /* This is a fragment for a frame that should already be pending in
2230          * fragment cache. Add this fragment to the end of the pending entry.
2231          */
2232         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2233                                           rx->seqno_idx, hdr);
2234         if (!entry) {
2235                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2236                 return RX_DROP_MONITOR;
2237         }
2238 
2239         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2240          *  MPDU PN values are not incrementing in steps of 1."
2241          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2242          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2243          */
2244         if (entry->check_sequential_pn) {
2245                 int i;
2246                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2247                 int queue;
2248 
2249                 if (!rx->key ||
2250                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2251                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2252                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2253                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2254                         return RX_DROP_UNUSABLE;
2255                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2256                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2257                         pn[i]++;
2258                         if (pn[i])
2259                                 break;
2260                 }
2261                 queue = rx->security_idx;
2262                 rpn = rx->key->u.ccmp.rx_pn[queue];
2263                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2264                         return RX_DROP_UNUSABLE;
2265                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2266         }
2267 
2268         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2269         __skb_queue_tail(&entry->skb_list, rx->skb);
2270         entry->last_frag = frag;
2271         entry->extra_len += rx->skb->len;
2272         if (ieee80211_has_morefrags(fc)) {
2273                 rx->skb = NULL;
2274                 return RX_QUEUED;
2275         }
2276 
2277         rx->skb = __skb_dequeue(&entry->skb_list);
2278         if (skb_tailroom(rx->skb) < entry->extra_len) {
2279                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2280                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2281                                               GFP_ATOMIC))) {
2282                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2283                         __skb_queue_purge(&entry->skb_list);
2284                         return RX_DROP_UNUSABLE;
2285                 }
2286         }
2287         while ((skb = __skb_dequeue(&entry->skb_list))) {
2288                 skb_put_data(rx->skb, skb->data, skb->len);
2289                 dev_kfree_skb(skb);
2290         }
2291 
2292  out:
2293         ieee80211_led_rx(rx->local);
2294  out_no_led:
2295         if (rx->sta)
2296                 rx->sta->rx_stats.packets++;
2297         return RX_CONTINUE;
2298 }
2299 
2300 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2301 {
2302         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2303                 return -EACCES;
2304 
2305         return 0;
2306 }
2307 
2308 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2309 {
2310         struct sk_buff *skb = rx->skb;
2311         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2312 
2313         /*
2314          * Pass through unencrypted frames if the hardware has
2315          * decrypted them already.
2316          */
2317         if (status->flag & RX_FLAG_DECRYPTED)
2318                 return 0;
2319 
2320         /* Drop unencrypted frames if key is set. */
2321         if (unlikely(!ieee80211_has_protected(fc) &&
2322                      !ieee80211_is_nullfunc(fc) &&
2323                      ieee80211_is_data(fc) && rx->key))
2324                 return -EACCES;
2325 
2326         return 0;
2327 }
2328 
2329 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2330 {
2331         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2332         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2333         __le16 fc = hdr->frame_control;
2334 
2335         /*
2336          * Pass through unencrypted frames if the hardware has
2337          * decrypted them already.
2338          */
2339         if (status->flag & RX_FLAG_DECRYPTED)
2340                 return 0;
2341 
2342         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2343                 if (unlikely(!ieee80211_has_protected(fc) &&
2344                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2345                              rx->key)) {
2346                         if (ieee80211_is_deauth(fc) ||
2347                             ieee80211_is_disassoc(fc))
2348                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2349                                                              rx->skb->data,
2350                                                              rx->skb->len);
2351                         return -EACCES;
2352                 }
2353                 /* BIP does not use Protected field, so need to check MMIE */
2354                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2355                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2356                         if (ieee80211_is_deauth(fc) ||
2357                             ieee80211_is_disassoc(fc))
2358                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2359                                                              rx->skb->data,
2360                                                              rx->skb->len);
2361                         return -EACCES;
2362                 }
2363                 /*
2364                  * When using MFP, Action frames are not allowed prior to
2365                  * having configured keys.
2366                  */
2367                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2368                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2369                         return -EACCES;
2370         }
2371 
2372         return 0;
2373 }
2374 
2375 static int
2376 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2377 {
2378         struct ieee80211_sub_if_data *sdata = rx->sdata;
2379         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2380         bool check_port_control = false;
2381         struct ethhdr *ehdr;
2382         int ret;
2383 
2384         *port_control = false;
2385         if (ieee80211_has_a4(hdr->frame_control) &&
2386             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2387                 return -1;
2388 
2389         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2390             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2391 
2392                 if (!sdata->u.mgd.use_4addr)
2393                         return -1;
2394                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2395                         check_port_control = true;
2396         }
2397 
2398         if (is_multicast_ether_addr(hdr->addr1) &&
2399             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2400                 return -1;
2401 
2402         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2403         if (ret < 0)
2404                 return ret;
2405 
2406         ehdr = (struct ethhdr *) rx->skb->data;
2407         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2408                 *port_control = true;
2409         else if (check_port_control)
2410                 return -1;
2411 
2412         return 0;
2413 }
2414 
2415 /*
2416  * requires that rx->skb is a frame with ethernet header
2417  */
2418 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2419 {
2420         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2421                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2422         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2423 
2424         /*
2425          * Allow EAPOL frames to us/the PAE group address regardless
2426          * of whether the frame was encrypted or not.
2427          */
2428         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2429             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2430              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2431                 return true;
2432 
2433         if (ieee80211_802_1x_port_control(rx) ||
2434             ieee80211_drop_unencrypted(rx, fc))
2435                 return false;
2436 
2437         return true;
2438 }
2439 
2440 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2441                                                  struct ieee80211_rx_data *rx)
2442 {
2443         struct ieee80211_sub_if_data *sdata = rx->sdata;
2444         struct net_device *dev = sdata->dev;
2445 
2446         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2447                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2448                      sdata->control_port_over_nl80211)) {
2449                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2450                 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
2451 
2452                 cfg80211_rx_control_port(dev, skb, noencrypt);
2453                 dev_kfree_skb(skb);
2454         } else {
2455                 memset(skb->cb, 0, sizeof(skb->cb));
2456 
2457                 /* deliver to local stack */
2458                 if (rx->napi)
2459                         napi_gro_receive(rx->napi, skb);
2460                 else
2461                         netif_receive_skb(skb);
2462         }
2463 }
2464 
2465 /*
2466  * requires that rx->skb is a frame with ethernet header
2467  */
2468 static void
2469 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2470 {
2471         struct ieee80211_sub_if_data *sdata = rx->sdata;
2472         struct net_device *dev = sdata->dev;
2473         struct sk_buff *skb, *xmit_skb;
2474         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2475         struct sta_info *dsta;
2476 
2477         skb = rx->skb;
2478         xmit_skb = NULL;
2479 
2480         ieee80211_rx_stats(dev, skb->len);
2481 
2482         if (rx->sta) {
2483                 /* The seqno index has the same property as needed
2484                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2485                  * for non-QoS-data frames. Here we know it's a data
2486                  * frame, so count MSDUs.
2487                  */
2488                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2489                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2490                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2491         }
2492 
2493         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2494              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2495             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2496             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2497                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2498                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2499                         /*
2500                          * send multicast frames both to higher layers in
2501                          * local net stack and back to the wireless medium
2502                          */
2503                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2504                         if (!xmit_skb)
2505                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2506                                                     dev->name);
2507                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2508                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2509                         dsta = sta_info_get(sdata, ehdr->h_dest);
2510                         if (dsta) {
2511                                 /*
2512                                  * The destination station is associated to
2513                                  * this AP (in this VLAN), so send the frame
2514                                  * directly to it and do not pass it to local
2515                                  * net stack.
2516                                  */
2517                                 xmit_skb = skb;
2518                                 skb = NULL;
2519                         }
2520                 }
2521         }
2522 
2523 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2524         if (skb) {
2525                 /* 'align' will only take the values 0 or 2 here since all
2526                  * frames are required to be aligned to 2-byte boundaries
2527                  * when being passed to mac80211; the code here works just
2528                  * as well if that isn't true, but mac80211 assumes it can
2529                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2530                  */
2531                 int align;
2532 
2533                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2534                 if (align) {
2535                         if (WARN_ON(skb_headroom(skb) < 3)) {
2536                                 dev_kfree_skb(skb);
2537                                 skb = NULL;
2538                         } else {
2539                                 u8 *data = skb->data;
2540                                 size_t len = skb_headlen(skb);
2541                                 skb->data -= align;
2542                                 memmove(skb->data, data, len);
2543                                 skb_set_tail_pointer(skb, len);
2544                         }
2545                 }
2546         }
2547 #endif
2548 
2549         if (skb) {
2550                 skb->protocol = eth_type_trans(skb, dev);
2551                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2552         }
2553 
2554         if (xmit_skb) {
2555                 /*
2556                  * Send to wireless media and increase priority by 256 to
2557                  * keep the received priority instead of reclassifying
2558                  * the frame (see cfg80211_classify8021d).
2559                  */
2560                 xmit_skb->priority += 256;
2561                 xmit_skb->protocol = htons(ETH_P_802_3);
2562                 skb_reset_network_header(xmit_skb);
2563                 skb_reset_mac_header(xmit_skb);
2564                 dev_queue_xmit(xmit_skb);
2565         }
2566 }
2567 
2568 static ieee80211_rx_result debug_noinline
2569 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2570 {
2571         struct net_device *dev = rx->sdata->dev;
2572         struct sk_buff *skb = rx->skb;
2573         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2574         __le16 fc = hdr->frame_control;
2575         struct sk_buff_head frame_list;
2576         struct ethhdr ethhdr;
2577         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2578 
2579         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2580                 check_da = NULL;
2581                 check_sa = NULL;
2582         } else switch (rx->sdata->vif.type) {
2583                 case NL80211_IFTYPE_AP:
2584                 case NL80211_IFTYPE_AP_VLAN:
2585                         check_da = NULL;
2586                         break;
2587                 case NL80211_IFTYPE_STATION:
2588                         if (!rx->sta ||
2589                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2590                                 check_sa = NULL;
2591                         break;
2592                 case NL80211_IFTYPE_MESH_POINT:
2593                         check_sa = NULL;
2594                         break;
2595                 default:
2596                         break;
2597         }
2598 
2599         skb->dev = dev;
2600         __skb_queue_head_init(&frame_list);
2601 
2602         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2603                                           rx->sdata->vif.addr,
2604                                           rx->sdata->vif.type,
2605                                           data_offset))
2606                 return RX_DROP_UNUSABLE;
2607 
2608         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2609                                  rx->sdata->vif.type,
2610                                  rx->local->hw.extra_tx_headroom,
2611                                  check_da, check_sa);
2612 
2613         while (!skb_queue_empty(&frame_list)) {
2614                 rx->skb = __skb_dequeue(&frame_list);
2615 
2616                 if (!ieee80211_frame_allowed(rx, fc)) {
2617                         dev_kfree_skb(rx->skb);
2618                         continue;
2619                 }
2620 
2621                 ieee80211_deliver_skb(rx);
2622         }
2623 
2624         return RX_QUEUED;
2625 }
2626 
2627 static ieee80211_rx_result debug_noinline
2628 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2629 {
2630         struct sk_buff *skb = rx->skb;
2631         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2632         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2633         __le16 fc = hdr->frame_control;
2634 
2635         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2636                 return RX_CONTINUE;
2637 
2638         if (unlikely(!ieee80211_is_data(fc)))
2639                 return RX_CONTINUE;
2640 
2641         if (unlikely(!ieee80211_is_data_present(fc)))
2642                 return RX_DROP_MONITOR;
2643 
2644         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2645                 switch (rx->sdata->vif.type) {
2646                 case NL80211_IFTYPE_AP_VLAN:
2647                         if (!rx->sdata->u.vlan.sta)
2648                                 return RX_DROP_UNUSABLE;
2649                         break;
2650                 case NL80211_IFTYPE_STATION:
2651                         if (!rx->sdata->u.mgd.use_4addr)
2652                                 return RX_DROP_UNUSABLE;
2653                         break;
2654                 default:
2655                         return RX_DROP_UNUSABLE;
2656                 }
2657         }
2658 
2659         if (is_multicast_ether_addr(hdr->addr1))
2660                 return RX_DROP_UNUSABLE;
2661 
2662         return __ieee80211_rx_h_amsdu(rx, 0);
2663 }
2664 
2665 #ifdef CONFIG_MAC80211_MESH
2666 static ieee80211_rx_result
2667 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2668 {
2669         struct ieee80211_hdr *fwd_hdr, *hdr;
2670         struct ieee80211_tx_info *info;
2671         struct ieee80211s_hdr *mesh_hdr;
2672         struct sk_buff *skb = rx->skb, *fwd_skb;
2673         struct ieee80211_local *local = rx->local;
2674         struct ieee80211_sub_if_data *sdata = rx->sdata;
2675         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2676         u16 ac, q, hdrlen;
2677         int tailroom = 0;
2678 
2679         hdr = (struct ieee80211_hdr *) skb->data;
2680         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2681 
2682         /* make sure fixed part of mesh header is there, also checks skb len */
2683         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2684                 return RX_DROP_MONITOR;
2685 
2686         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2687 
2688         /* make sure full mesh header is there, also checks skb len */
2689         if (!pskb_may_pull(rx->skb,
2690                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2691                 return RX_DROP_MONITOR;
2692 
2693         /* reload pointers */
2694         hdr = (struct ieee80211_hdr *) skb->data;
2695         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2696 
2697         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2698                 return RX_DROP_MONITOR;
2699 
2700         /* frame is in RMC, don't forward */
2701         if (ieee80211_is_data(hdr->frame_control) &&
2702             is_multicast_ether_addr(hdr->addr1) &&
2703             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2704                 return RX_DROP_MONITOR;
2705 
2706         if (!ieee80211_is_data(hdr->frame_control))
2707                 return RX_CONTINUE;
2708 
2709         if (!mesh_hdr->ttl)
2710                 return RX_DROP_MONITOR;
2711 
2712         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2713                 struct mesh_path *mppath;
2714                 char *proxied_addr;
2715                 char *mpp_addr;
2716 
2717                 if (is_multicast_ether_addr(hdr->addr1)) {
2718                         mpp_addr = hdr->addr3;
2719                         proxied_addr = mesh_hdr->eaddr1;
2720                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2721                             MESH_FLAGS_AE_A5_A6) {
2722                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2723                         mpp_addr = hdr->addr4;
2724                         proxied_addr = mesh_hdr->eaddr2;
2725                 } else {
2726                         return RX_DROP_MONITOR;
2727                 }
2728 
2729                 rcu_read_lock();
2730                 mppath = mpp_path_lookup(sdata, proxied_addr);
2731                 if (!mppath) {
2732                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2733                 } else {
2734                         spin_lock_bh(&mppath->state_lock);
2735                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2736                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2737                         mppath->exp_time = jiffies;
2738                         spin_unlock_bh(&mppath->state_lock);
2739                 }
2740                 rcu_read_unlock();
2741         }
2742 
2743         /* Frame has reached destination.  Don't forward */
2744         if (!is_multicast_ether_addr(hdr->addr1) &&
2745             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2746                 return RX_CONTINUE;
2747 
2748         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2749         q = sdata->vif.hw_queue[ac];
2750         if (ieee80211_queue_stopped(&local->hw, q)) {
2751                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2752                 return RX_DROP_MONITOR;
2753         }
2754         skb_set_queue_mapping(skb, q);
2755 
2756         if (!--mesh_hdr->ttl) {
2757                 if (!is_multicast_ether_addr(hdr->addr1))
2758                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2759                                                      dropped_frames_ttl);
2760                 goto out;
2761         }
2762 
2763         if (!ifmsh->mshcfg.dot11MeshForwarding)
2764                 goto out;
2765 
2766         if (sdata->crypto_tx_tailroom_needed_cnt)
2767                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2768 
2769         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2770                                        sdata->encrypt_headroom,
2771                                   tailroom, GFP_ATOMIC);
2772         if (!fwd_skb)
2773                 goto out;
2774 
2775         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2776         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2777         info = IEEE80211_SKB_CB(fwd_skb);
2778         memset(info, 0, sizeof(*info));
2779         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2780         info->control.vif = &rx->sdata->vif;
2781         info->control.jiffies = jiffies;
2782         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2783                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2784                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2785                 /* update power mode indication when forwarding */
2786                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2787         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2788                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2789                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2790         } else {
2791                 /* unable to resolve next hop */
2792                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2793                                    fwd_hdr->addr3, 0,
2794                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2795                                    fwd_hdr->addr2);
2796                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2797                 kfree_skb(fwd_skb);
2798                 return RX_DROP_MONITOR;
2799         }
2800 
2801         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2802         ieee80211_add_pending_skb(local, fwd_skb);
2803  out:
2804         if (is_multicast_ether_addr(hdr->addr1))
2805                 return RX_CONTINUE;
2806         return RX_DROP_MONITOR;
2807 }
2808 #endif
2809 
2810 static ieee80211_rx_result debug_noinline
2811 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2812 {
2813         struct ieee80211_sub_if_data *sdata = rx->sdata;
2814         struct ieee80211_local *local = rx->local;
2815         struct net_device *dev = sdata->dev;
2816         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2817         __le16 fc = hdr->frame_control;
2818         bool port_control;
2819         int err;
2820 
2821         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2822                 return RX_CONTINUE;
2823 
2824         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2825                 return RX_DROP_MONITOR;
2826 
2827         /*
2828          * Send unexpected-4addr-frame event to hostapd. For older versions,
2829          * also drop the frame to cooked monitor interfaces.
2830          */
2831         if (ieee80211_has_a4(hdr->frame_control) &&
2832             sdata->vif.type == NL80211_IFTYPE_AP) {
2833                 if (rx->sta &&
2834                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2835                         cfg80211_rx_unexpected_4addr_frame(
2836                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2837                 return RX_DROP_MONITOR;
2838         }
2839 
2840         err = __ieee80211_data_to_8023(rx, &port_control);
2841         if (unlikely(err))
2842                 return RX_DROP_UNUSABLE;
2843 
2844         if (!ieee80211_frame_allowed(rx, fc))
2845                 return RX_DROP_MONITOR;
2846 
2847         /* directly handle TDLS channel switch requests/responses */
2848         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2849                                                 cpu_to_be16(ETH_P_TDLS))) {
2850                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2851 
2852                 if (pskb_may_pull(rx->skb,
2853                                   offsetof(struct ieee80211_tdls_data, u)) &&
2854                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2855                     tf->category == WLAN_CATEGORY_TDLS &&
2856                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2857                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2858                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2859                         schedule_work(&local->tdls_chsw_work);
2860                         if (rx->sta)
2861                                 rx->sta->rx_stats.packets++;
2862 
2863                         return RX_QUEUED;
2864                 }
2865         }
2866 
2867         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2868             unlikely(port_control) && sdata->bss) {
2869                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2870                                      u.ap);
2871                 dev = sdata->dev;
2872                 rx->sdata = sdata;
2873         }
2874 
2875         rx->skb->dev = dev;
2876 
2877         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2878             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2879             !is_multicast_ether_addr(
2880                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2881             (!local->scanning &&
2882              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2883                 mod_timer(&local->dynamic_ps_timer, jiffies +
2884                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2885 
2886         ieee80211_deliver_skb(rx);
2887 
2888         return RX_QUEUED;
2889 }
2890 
2891 static ieee80211_rx_result debug_noinline
2892 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2893 {
2894         struct sk_buff *skb = rx->skb;
2895         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2896         struct tid_ampdu_rx *tid_agg_rx;
2897         u16 start_seq_num;
2898         u16 tid;
2899 
2900         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2901                 return RX_CONTINUE;
2902 
2903         if (ieee80211_is_back_req(bar->frame_control)) {
2904                 struct {
2905                         __le16 control, start_seq_num;
2906                 } __packed bar_data;
2907                 struct ieee80211_event event = {
2908                         .type = BAR_RX_EVENT,
2909                 };
2910 
2911                 if (!rx->sta)
2912                         return RX_DROP_MONITOR;
2913 
2914                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2915                                   &bar_data, sizeof(bar_data)))
2916                         return RX_DROP_MONITOR;
2917 
2918                 tid = le16_to_cpu(bar_data.control) >> 12;
2919 
2920                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2921                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2922                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2923                                              WLAN_BACK_RECIPIENT,
2924                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2925 
2926                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2927                 if (!tid_agg_rx)
2928                         return RX_DROP_MONITOR;
2929 
2930                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2931                 event.u.ba.tid = tid;
2932                 event.u.ba.ssn = start_seq_num;
2933                 event.u.ba.sta = &rx->sta->sta;
2934 
2935                 /* reset session timer */
2936                 if (tid_agg_rx->timeout)
2937                         mod_timer(&tid_agg_rx->session_timer,
2938                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2939 
2940                 spin_lock(&tid_agg_rx->reorder_lock);
2941                 /* release stored frames up to start of BAR */
2942                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2943                                                  start_seq_num, frames);
2944                 spin_unlock(&tid_agg_rx->reorder_lock);
2945 
2946                 drv_event_callback(rx->local, rx->sdata, &event);
2947 
2948                 kfree_skb(skb);
2949                 return RX_QUEUED;
2950         }
2951 
2952         /*
2953          * After this point, we only want management frames,
2954          * so we can drop all remaining control frames to
2955          * cooked monitor interfaces.
2956          */
2957         return RX_DROP_MONITOR;
2958 }
2959 
2960 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2961                                            struct ieee80211_mgmt *mgmt,
2962                                            size_t len)
2963 {
2964         struct ieee80211_local *local = sdata->local;
2965         struct sk_buff *skb;
2966         struct ieee80211_mgmt *resp;
2967 
2968         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2969                 /* Not to own unicast address */
2970                 return;
2971         }
2972 
2973         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2974             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2975                 /* Not from the current AP or not associated yet. */
2976                 return;
2977         }
2978 
2979         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2980                 /* Too short SA Query request frame */
2981                 return;
2982         }
2983 
2984         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2985         if (skb == NULL)
2986                 return;
2987 
2988         skb_reserve(skb, local->hw.extra_tx_headroom);
2989         resp = skb_put_zero(skb, 24);
2990         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2991         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2992         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2993         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2994                                           IEEE80211_STYPE_ACTION);
2995         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2996         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2997         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2998         memcpy(resp->u.action.u.sa_query.trans_id,
2999                mgmt->u.action.u.sa_query.trans_id,
3000                WLAN_SA_QUERY_TR_ID_LEN);
3001 
3002         ieee80211_tx_skb(sdata, skb);
3003 }
3004 
3005 static ieee80211_rx_result debug_noinline
3006 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3007 {
3008         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3009         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3010 
3011         /*
3012          * From here on, look only at management frames.
3013          * Data and control frames are already handled,
3014          * and unknown (reserved) frames are useless.
3015          */
3016         if (rx->skb->len < 24)
3017                 return RX_DROP_MONITOR;
3018 
3019         if (!ieee80211_is_mgmt(mgmt->frame_control))
3020                 return RX_DROP_MONITOR;
3021 
3022         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3023             ieee80211_is_beacon(mgmt->frame_control) &&
3024             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3025                 int sig = 0;
3026 
3027                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3028                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3029                         sig = status->signal;
3030 
3031                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3032                                             rx->skb->data, rx->skb->len,
3033                                             status->freq, sig);
3034                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3035         }
3036 
3037         if (ieee80211_drop_unencrypted_mgmt(rx))
3038                 return RX_DROP_UNUSABLE;
3039 
3040         return RX_CONTINUE;
3041 }
3042 
3043 static ieee80211_rx_result debug_noinline
3044 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3045 {
3046         struct ieee80211_local *local = rx->local;
3047         struct ieee80211_sub_if_data *sdata = rx->sdata;
3048         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3049         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3050         int len = rx->skb->len;
3051 
3052         if (!ieee80211_is_action(mgmt->frame_control))
3053                 return RX_CONTINUE;
3054 
3055         /* drop too small frames */
3056         if (len < IEEE80211_MIN_ACTION_SIZE)
3057                 return RX_DROP_UNUSABLE;
3058 
3059         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3060             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3061             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3062                 return RX_DROP_UNUSABLE;
3063 
3064         switch (mgmt->u.action.category) {
3065         case WLAN_CATEGORY_HT:
3066                 /* reject HT action frames from stations not supporting HT */
3067                 if (!rx->sta->sta.ht_cap.ht_supported)
3068                         goto invalid;
3069 
3070                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3071                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3072                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3073                     sdata->vif.type != NL80211_IFTYPE_AP &&
3074                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3075                         break;
3076 
3077                 /* verify action & smps_control/chanwidth are present */
3078                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3079                         goto invalid;
3080 
3081                 switch (mgmt->u.action.u.ht_smps.action) {
3082                 case WLAN_HT_ACTION_SMPS: {
3083                         struct ieee80211_supported_band *sband;
3084                         enum ieee80211_smps_mode smps_mode;
3085                         struct sta_opmode_info sta_opmode = {};
3086 
3087                         /* convert to HT capability */
3088                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3089                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3090                                 smps_mode = IEEE80211_SMPS_OFF;
3091                                 break;
3092                         case WLAN_HT_SMPS_CONTROL_STATIC:
3093                                 smps_mode = IEEE80211_SMPS_STATIC;
3094                                 break;
3095                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3096                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3097                                 break;
3098                         default:
3099                                 goto invalid;
3100                         }
3101 
3102                         /* if no change do nothing */
3103                         if (rx->sta->sta.smps_mode == smps_mode)
3104                                 goto handled;
3105                         rx->sta->sta.smps_mode = smps_mode;
3106                         sta_opmode.smps_mode =
3107                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3108                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3109 
3110                         sband = rx->local->hw.wiphy->bands[status->band];
3111 
3112                         rate_control_rate_update(local, sband, rx->sta,
3113                                                  IEEE80211_RC_SMPS_CHANGED);
3114                         cfg80211_sta_opmode_change_notify(sdata->dev,
3115                                                           rx->sta->addr,
3116                                                           &sta_opmode,
3117                                                           GFP_ATOMIC);
3118                         goto handled;
3119                 }
3120                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3121                         struct ieee80211_supported_band *sband;
3122                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3123                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3124                         struct sta_opmode_info sta_opmode = {};
3125 
3126                         /* If it doesn't support 40 MHz it can't change ... */
3127                         if (!(rx->sta->sta.ht_cap.cap &
3128                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3129                                 goto handled;
3130 
3131                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3132                                 max_bw = IEEE80211_STA_RX_BW_20;
3133                         else
3134                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3135 
3136                         /* set cur_max_bandwidth and recalc sta bw */
3137                         rx->sta->cur_max_bandwidth = max_bw;
3138                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3139 
3140                         if (rx->sta->sta.bandwidth == new_bw)
3141                                 goto handled;
3142 
3143                         rx->sta->sta.bandwidth = new_bw;
3144                         sband = rx->local->hw.wiphy->bands[status->band];
3145                         sta_opmode.bw =
3146                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3147                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3148 
3149                         rate_control_rate_update(local, sband, rx->sta,
3150                                                  IEEE80211_RC_BW_CHANGED);
3151                         cfg80211_sta_opmode_change_notify(sdata->dev,
3152                                                           rx->sta->addr,
3153                                                           &sta_opmode,
3154                                                           GFP_ATOMIC);
3155                         goto handled;
3156                 }
3157                 default:
3158                         goto invalid;
3159                 }
3160 
3161                 break;
3162         case WLAN_CATEGORY_PUBLIC:
3163                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3164                         goto invalid;
3165                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3166                         break;
3167                 if (!rx->sta)
3168                         break;
3169                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3170                         break;
3171                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3172                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3173                         break;
3174                 if (len < offsetof(struct ieee80211_mgmt,
3175                                    u.action.u.ext_chan_switch.variable))
3176                         goto invalid;
3177                 goto queue;
3178         case WLAN_CATEGORY_VHT:
3179                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3180                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3181                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3182                     sdata->vif.type != NL80211_IFTYPE_AP &&
3183                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3184                         break;
3185 
3186                 /* verify action code is present */
3187                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3188                         goto invalid;
3189 
3190                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3191                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3192                         /* verify opmode is present */
3193                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3194                                 goto invalid;
3195                         goto queue;
3196                 }
3197                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3198                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3199                                 goto invalid;
3200                         goto queue;
3201                 }
3202                 default:
3203                         break;
3204                 }
3205                 break;
3206         case WLAN_CATEGORY_BACK:
3207                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3208                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3209                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3210                     sdata->vif.type != NL80211_IFTYPE_AP &&
3211                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3212                         break;
3213 
3214                 /* verify action_code is present */
3215                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3216                         break;
3217 
3218                 switch (mgmt->u.action.u.addba_req.action_code) {
3219                 case WLAN_ACTION_ADDBA_REQ:
3220                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3221                                    sizeof(mgmt->u.action.u.addba_req)))
3222                                 goto invalid;
3223                         break;
3224                 case WLAN_ACTION_ADDBA_RESP:
3225                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3226                                    sizeof(mgmt->u.action.u.addba_resp)))
3227                                 goto invalid;
3228                         break;
3229                 case WLAN_ACTION_DELBA:
3230                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3231                                    sizeof(mgmt->u.action.u.delba)))
3232                                 goto invalid;
3233                         break;
3234                 default:
3235                         goto invalid;
3236                 }
3237 
3238                 goto queue;
3239         case WLAN_CATEGORY_SPECTRUM_MGMT:
3240                 /* verify action_code is present */
3241                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3242                         break;
3243 
3244                 switch (mgmt->u.action.u.measurement.action_code) {
3245                 case WLAN_ACTION_SPCT_MSR_REQ:
3246                         if (status->band != NL80211_BAND_5GHZ)
3247                                 break;
3248 
3249                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3250                                    sizeof(mgmt->u.action.u.measurement)))
3251                                 break;
3252 
3253                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3254                                 break;
3255 
3256                         ieee80211_process_measurement_req(sdata, mgmt, len);
3257                         goto handled;
3258                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3259                         u8 *bssid;
3260                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3261                                    sizeof(mgmt->u.action.u.chan_switch)))
3262                                 break;
3263 
3264                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3265                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3266                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3267                                 break;
3268 
3269                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3270                                 bssid = sdata->u.mgd.bssid;
3271                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3272                                 bssid = sdata->u.ibss.bssid;
3273                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3274                                 bssid = mgmt->sa;
3275                         else
3276                                 break;
3277 
3278                         if (!ether_addr_equal(mgmt->bssid, bssid))
3279                                 break;
3280 
3281                         goto queue;
3282                         }
3283                 }
3284                 break;
3285         case WLAN_CATEGORY_SA_QUERY:
3286                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3287                            sizeof(mgmt->u.action.u.sa_query)))
3288                         break;
3289 
3290                 switch (mgmt->u.action.u.sa_query.action) {
3291                 case WLAN_ACTION_SA_QUERY_REQUEST:
3292                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3293                                 break;
3294                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3295                         goto handled;
3296                 }
3297                 break;
3298         case WLAN_CATEGORY_SELF_PROTECTED:
3299                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3300                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3301                         break;
3302 
3303                 switch (mgmt->u.action.u.self_prot.action_code) {
3304                 case WLAN_SP_MESH_PEERING_OPEN:
3305                 case WLAN_SP_MESH_PEERING_CLOSE:
3306                 case WLAN_SP_MESH_PEERING_CONFIRM:
3307                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3308                                 goto invalid;
3309                         if (sdata->u.mesh.user_mpm)
3310                                 /* userspace handles this frame */
3311                                 break;
3312                         goto queue;
3313                 case WLAN_SP_MGK_INFORM:
3314                 case WLAN_SP_MGK_ACK:
3315                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3316                                 goto invalid;
3317                         break;
3318                 }
3319                 break;
3320         case WLAN_CATEGORY_MESH_ACTION:
3321                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3322                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3323                         break;
3324 
3325                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3326                         break;
3327                 if (mesh_action_is_path_sel(mgmt) &&
3328                     !mesh_path_sel_is_hwmp(sdata))
3329                         break;
3330                 goto queue;
3331         }
3332 
3333         return RX_CONTINUE;
3334 
3335  invalid:
3336         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3337         /* will return in the next handlers */
3338         return RX_CONTINUE;
3339 
3340  handled:
3341         if (rx->sta)
3342                 rx->sta->rx_stats.packets++;
3343         dev_kfree_skb(rx->skb);
3344         return RX_QUEUED;
3345 
3346  queue:
3347         skb_queue_tail(&sdata->skb_queue, rx->skb);
3348         ieee80211_queue_work(&local->hw, &sdata->work);
3349         if (rx->sta)
3350                 rx->sta->rx_stats.packets++;
3351         return RX_QUEUED;
3352 }
3353 
3354 static ieee80211_rx_result debug_noinline
3355 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3356 {
3357         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3358         int sig = 0;
3359 
3360         /* skip known-bad action frames and return them in the next handler */
3361         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3362                 return RX_CONTINUE;
3363 
3364         /*
3365          * Getting here means the kernel doesn't know how to handle
3366          * it, but maybe userspace does ... include returned frames
3367          * so userspace can register for those to know whether ones
3368          * it transmitted were processed or returned.
3369          */
3370 
3371         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3372             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3373                 sig = status->signal;
3374 
3375         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3376                              rx->skb->data, rx->skb->len, 0)) {
3377                 if (rx->sta)
3378                         rx->sta->rx_stats.packets++;
3379                 dev_kfree_skb(rx->skb);
3380                 return RX_QUEUED;
3381         }
3382 
3383         return RX_CONTINUE;
3384 }
3385 
3386 static ieee80211_rx_result debug_noinline
3387 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3388 {
3389         struct ieee80211_local *local = rx->local;
3390         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3391         struct sk_buff *nskb;
3392         struct ieee80211_sub_if_data *sdata = rx->sdata;
3393         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3394 
3395         if (!ieee80211_is_action(mgmt->frame_control))
3396                 return RX_CONTINUE;
3397 
3398         /*
3399          * For AP mode, hostapd is responsible for handling any action
3400          * frames that we didn't handle, including returning unknown
3401          * ones. For all other modes we will return them to the sender,
3402          * setting the 0x80 bit in the action category, as required by
3403          * 802.11-2012 9.24.4.
3404          * Newer versions of hostapd shall also use the management frame
3405          * registration mechanisms, but older ones still use cooked
3406          * monitor interfaces so push all frames there.
3407          */
3408         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3409             (sdata->vif.type == NL80211_IFTYPE_AP ||
3410              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3411                 return RX_DROP_MONITOR;
3412 
3413         if (is_multicast_ether_addr(mgmt->da))
3414                 return RX_DROP_MONITOR;
3415 
3416         /* do not return rejected action frames */
3417         if (mgmt->u.action.category & 0x80)
3418                 return RX_DROP_UNUSABLE;
3419 
3420         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3421                                GFP_ATOMIC);
3422         if (nskb) {
3423                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3424 
3425                 nmgmt->u.action.category |= 0x80;
3426                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3427                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3428 
3429                 memset(nskb->cb, 0, sizeof(nskb->cb));
3430 
3431                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3432                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3433 
3434                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3435                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3436                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3437                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3438                                 info->hw_queue =
3439                                         local->hw.offchannel_tx_hw_queue;
3440                 }
3441 
3442                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3443                                             status->band, 0);
3444         }
3445         dev_kfree_skb(rx->skb);
3446         return RX_QUEUED;
3447 }
3448 
3449 static ieee80211_rx_result debug_noinline
3450 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3451 {
3452         struct ieee80211_sub_if_data *sdata = rx->sdata;
3453         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3454         __le16 stype;
3455 
3456         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3457 
3458         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3459             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3460             sdata->vif.type != NL80211_IFTYPE_OCB &&
3461             sdata->vif.type != NL80211_IFTYPE_STATION)
3462                 return RX_DROP_MONITOR;
3463 
3464         switch (stype) {
3465         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3466         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3467         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3468                 /* process for all: mesh, mlme, ibss */
3469                 break;
3470         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3471         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3472         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3473         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3474                 if (is_multicast_ether_addr(mgmt->da) &&
3475                     !is_broadcast_ether_addr(mgmt->da))
3476                         return RX_DROP_MONITOR;
3477 
3478                 /* process only for station */
3479                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3480                         return RX_DROP_MONITOR;
3481                 break;
3482         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3483                 /* process only for ibss and mesh */
3484                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3485                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3486                         return RX_DROP_MONITOR;
3487                 break;
3488         default:
3489                 return RX_DROP_MONITOR;
3490         }
3491 
3492         /* queue up frame and kick off work to process it */
3493         skb_queue_tail(&sdata->skb_queue, rx->skb);
3494         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3495         if (rx->sta)
3496                 rx->sta->rx_stats.packets++;
3497 
3498         return RX_QUEUED;
3499 }
3500 
3501 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3502                                         struct ieee80211_rate *rate)
3503 {
3504         struct ieee80211_sub_if_data *sdata;
3505         struct ieee80211_local *local = rx->local;
3506         struct sk_buff *skb = rx->skb, *skb2;
3507         struct net_device *prev_dev = NULL;
3508         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3509         int needed_headroom;
3510 
3511         /*
3512          * If cooked monitor has been processed already, then
3513          * don't do it again. If not, set the flag.
3514          */
3515         if (rx->flags & IEEE80211_RX_CMNTR)
3516                 goto out_free_skb;
3517         rx->flags |= IEEE80211_RX_CMNTR;
3518 
3519         /* If there are no cooked monitor interfaces, just free the SKB */
3520         if (!local->cooked_mntrs)
3521                 goto out_free_skb;
3522 
3523         /* vendor data is long removed here */
3524         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3525         /* room for the radiotap header based on driver features */
3526         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3527 
3528         if (skb_headroom(skb) < needed_headroom &&
3529             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3530                 goto out_free_skb;
3531 
3532         /* prepend radiotap information */
3533         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3534                                          false);
3535 
3536         skb_reset_mac_header(skb);
3537         skb->ip_summed = CHECKSUM_UNNECESSARY;
3538         skb->pkt_type = PACKET_OTHERHOST;
3539         skb->protocol = htons(ETH_P_802_2);
3540 
3541         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3542                 if (!ieee80211_sdata_running(sdata))
3543                         continue;
3544 
3545                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3546                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3547                         continue;
3548 
3549                 if (prev_dev) {
3550                         skb2 = skb_clone(skb, GFP_ATOMIC);
3551                         if (skb2) {
3552                                 skb2->dev = prev_dev;
3553                                 netif_receive_skb(skb2);
3554                         }
3555                 }
3556 
3557                 prev_dev = sdata->dev;
3558                 ieee80211_rx_stats(sdata->dev, skb->len);
3559         }
3560 
3561         if (prev_dev) {
3562                 skb->dev = prev_dev;
3563                 netif_receive_skb(skb);
3564                 return;
3565         }
3566 
3567  out_free_skb:
3568         dev_kfree_skb(skb);
3569 }
3570 
3571 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3572                                          ieee80211_rx_result res)
3573 {
3574         switch (res) {
3575         case RX_DROP_MONITOR:
3576                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3577                 if (rx->sta)
3578                         rx->sta->rx_stats.dropped++;
3579                 /* fall through */
3580         case RX_CONTINUE: {
3581                 struct ieee80211_rate *rate = NULL;
3582                 struct ieee80211_supported_band *sband;
3583                 struct ieee80211_rx_status *status;
3584 
3585                 status = IEEE80211_SKB_RXCB((rx->skb));
3586 
3587                 sband = rx->local->hw.wiphy->bands[status->band];
3588                 if (status->encoding == RX_ENC_LEGACY)
3589                         rate = &sband->bitrates[status->rate_idx];
3590 
3591                 ieee80211_rx_cooked_monitor(rx, rate);
3592                 break;
3593                 }
3594         case RX_DROP_UNUSABLE:
3595                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3596                 if (rx->sta)
3597                         rx->sta->rx_stats.dropped++;
3598                 dev_kfree_skb(rx->skb);
3599                 break;
3600         case RX_QUEUED:
3601                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3602                 break;
3603         }
3604 }
3605 
3606 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3607                                   struct sk_buff_head *frames)
3608 {
3609         ieee80211_rx_result res = RX_DROP_MONITOR;
3610         struct sk_buff *skb;
3611 
3612 #define CALL_RXH(rxh)                   \
3613         do {                            \
3614                 res = rxh(rx);          \
3615                 if (res != RX_CONTINUE) \
3616                         goto rxh_next;  \
3617         } while (0)
3618 
3619         /* Lock here to avoid hitting all of the data used in the RX
3620          * path (e.g. key data, station data, ...) concurrently when
3621          * a frame is released from the reorder buffer due to timeout
3622          * from the timer, potentially concurrently with RX from the
3623          * driver.
3624          */
3625         spin_lock_bh(&rx->local->rx_path_lock);
3626 
3627         while ((skb = __skb_dequeue(frames))) {
3628                 /*
3629                  * all the other fields are valid across frames
3630                  * that belong to an aMPDU since they are on the
3631                  * same TID from the same station
3632                  */
3633                 rx->skb = skb;
3634 
3635                 CALL_RXH(ieee80211_rx_h_check_more_data);
3636                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3637                 CALL_RXH(ieee80211_rx_h_sta_process);
3638                 CALL_RXH(ieee80211_rx_h_decrypt);
3639                 CALL_RXH(ieee80211_rx_h_defragment);
3640                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3641                 /* must be after MMIC verify so header is counted in MPDU mic */
3642 #ifdef CONFIG_MAC80211_MESH
3643                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3644                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3645 #endif
3646                 CALL_RXH(ieee80211_rx_h_amsdu);
3647                 CALL_RXH(ieee80211_rx_h_data);
3648 
3649                 /* special treatment -- needs the queue */
3650                 res = ieee80211_rx_h_ctrl(rx, frames);
3651                 if (res != RX_CONTINUE)
3652                         goto rxh_next;
3653 
3654                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3655                 CALL_RXH(ieee80211_rx_h_action);
3656                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3657                 CALL_RXH(ieee80211_rx_h_action_return);
3658                 CALL_RXH(ieee80211_rx_h_mgmt);
3659 
3660  rxh_next:
3661                 ieee80211_rx_handlers_result(rx, res);
3662 
3663 #undef CALL_RXH
3664         }
3665 
3666         spin_unlock_bh(&rx->local->rx_path_lock);
3667 }
3668 
3669 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3670 {
3671         struct sk_buff_head reorder_release;
3672         ieee80211_rx_result res = RX_DROP_MONITOR;
3673 
3674         __skb_queue_head_init(&reorder_release);
3675 
3676 #define CALL_RXH(rxh)                   \
3677         do {                            \
3678                 res = rxh(rx);          \
3679                 if (res != RX_CONTINUE) \
3680                         goto rxh_next;  \
3681         } while (0)
3682 
3683         CALL_RXH(ieee80211_rx_h_check_dup);
3684         CALL_RXH(ieee80211_rx_h_check);
3685 
3686         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3687 
3688         ieee80211_rx_handlers(rx, &reorder_release);
3689         return;
3690 
3691  rxh_next:
3692         ieee80211_rx_handlers_result(rx, res);
3693 
3694 #undef CALL_RXH
3695 }
3696 
3697 /*
3698  * This function makes calls into the RX path, therefore
3699  * it has to be invoked under RCU read lock.
3700  */
3701 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3702 {
3703         struct sk_buff_head frames;
3704         struct ieee80211_rx_data rx = {
3705                 .sta = sta,
3706                 .sdata = sta->sdata,
3707                 .local = sta->local,
3708                 /* This is OK -- must be QoS data frame */
3709                 .security_idx = tid,
3710                 .seqno_idx = tid,
3711                 .napi = NULL, /* must be NULL to not have races */
3712         };
3713         struct tid_ampdu_rx *tid_agg_rx;
3714 
3715         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3716         if (!tid_agg_rx)
3717                 return;
3718 
3719         __skb_queue_head_init(&frames);
3720 
3721         spin_lock(&tid_agg_rx->reorder_lock);
3722         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3723         spin_unlock(&tid_agg_rx->reorder_lock);
3724 
3725         if (!skb_queue_empty(&frames)) {
3726                 struct ieee80211_event event = {
3727                         .type = BA_FRAME_TIMEOUT,
3728                         .u.ba.tid = tid,
3729                         .u.ba.sta = &sta->sta,
3730                 };
3731                 drv_event_callback(rx.local, rx.sdata, &event);
3732         }
3733 
3734         ieee80211_rx_handlers(&rx, &frames);
3735 }
3736 
3737 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3738                                           u16 ssn, u64 filtered,
3739                                           u16 received_mpdus)
3740 {
3741         struct sta_info *sta;
3742         struct tid_ampdu_rx *tid_agg_rx;
3743         struct sk_buff_head frames;
3744         struct ieee80211_rx_data rx = {
3745                 /* This is OK -- must be QoS data frame */
3746                 .security_idx = tid,
3747                 .seqno_idx = tid,
3748         };
3749         int i, diff;
3750 
3751         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3752                 return;
3753 
3754         __skb_queue_head_init(&frames);
3755 
3756         sta = container_of(pubsta, struct sta_info, sta);
3757 
3758         rx.sta = sta;
3759         rx.sdata = sta->sdata;
3760         rx.local = sta->local;
3761 
3762         rcu_read_lock();
3763         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3764         if (!tid_agg_rx)
3765                 goto out;
3766 
3767         spin_lock_bh(&tid_agg_rx->reorder_lock);
3768 
3769         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3770                 int release;
3771 
3772                 /* release all frames in the reorder buffer */
3773                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3774                            IEEE80211_SN_MODULO;
3775                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3776                                                  release, &frames);
3777                 /* update ssn to match received ssn */
3778                 tid_agg_rx->head_seq_num = ssn;
3779         } else {
3780                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3781                                                  &frames);
3782         }
3783 
3784         /* handle the case that received ssn is behind the mac ssn.
3785          * it can be tid_agg_rx->buf_size behind and still be valid */
3786         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3787         if (diff >= tid_agg_rx->buf_size) {
3788                 tid_agg_rx->reorder_buf_filtered = 0;
3789                 goto release;
3790         }
3791         filtered = filtered >> diff;
3792         ssn += diff;
3793 
3794         /* update bitmap */
3795         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3796                 int index = (ssn + i) % tid_agg_rx->buf_size;
3797 
3798                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3799                 if (filtered & BIT_ULL(i))
3800                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3801         }
3802 
3803         /* now process also frames that the filter marking released */
3804         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3805 
3806 release:
3807         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3808 
3809         ieee80211_rx_handlers(&rx, &frames);
3810 
3811  out:
3812         rcu_read_unlock();
3813 }
3814 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3815 
3816 /* main receive path */
3817 
3818 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3819 {
3820         struct ieee80211_sub_if_data *sdata = rx->sdata;
3821         struct sk_buff *skb = rx->skb;
3822         struct ieee80211_hdr *hdr = (void *)skb->data;
3823         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3824         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3825         bool multicast = is_multicast_ether_addr(hdr->addr1);
3826 
3827         switch (sdata->vif.type) {
3828         case NL80211_IFTYPE_STATION:
3829                 if (!bssid && !sdata->u.mgd.use_4addr)
3830                         return false;
3831                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3832                         return false;
3833                 if (multicast)
3834                         return true;
3835                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3836         case NL80211_IFTYPE_ADHOC:
3837                 if (!bssid)
3838                         return false;
3839                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3840                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3841                         return false;
3842                 if (ieee80211_is_beacon(hdr->frame_control))
3843                         return true;
3844                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3845                         return false;
3846                 if (!multicast &&
3847                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3848                         return false;
3849                 if (!rx->sta) {
3850                         int rate_idx;
3851                         if (status->encoding != RX_ENC_LEGACY)
3852                                 rate_idx = 0; /* TODO: HT/VHT rates */
3853                         else
3854                                 rate_idx = status->rate_idx;
3855                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3856                                                  BIT(rate_idx));
3857                 }
3858                 return true;
3859         case NL80211_IFTYPE_OCB:
3860                 if (!bssid)
3861                         return false;
3862                 if (!ieee80211_is_data_present(hdr->frame_control))
3863                         return false;
3864                 if (!is_broadcast_ether_addr(bssid))
3865                         return false;
3866                 if (!multicast &&
3867                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3868                         return false;
3869                 if (!rx->sta) {
3870                         int rate_idx;
3871                         if (status->encoding != RX_ENC_LEGACY)
3872                                 rate_idx = 0; /* TODO: HT rates */
3873                         else
3874                                 rate_idx = status->rate_idx;
3875                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3876                                                 BIT(rate_idx));
3877                 }
3878                 return true;
3879         case NL80211_IFTYPE_MESH_POINT:
3880                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3881                         return false;
3882                 if (multicast)
3883                         return true;
3884                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3885         case NL80211_IFTYPE_AP_VLAN:
3886         case NL80211_IFTYPE_AP:
3887                 if (!bssid)
3888                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3889 
3890                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3891                         /*
3892                          * Accept public action frames even when the
3893                          * BSSID doesn't match, this is used for P2P
3894                          * and location updates. Note that mac80211
3895                          * itself never looks at these frames.
3896                          */
3897                         if (!multicast &&
3898                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3899                                 return false;
3900                         if (ieee80211_is_public_action(hdr, skb->len))
3901                                 return true;
3902                         return ieee80211_is_beacon(hdr->frame_control);
3903                 }
3904 
3905                 if (!ieee80211_has_tods(hdr->frame_control)) {
3906                         /* ignore data frames to TDLS-peers */
3907                         if (ieee80211_is_data(hdr->frame_control))
3908                                 return false;
3909                         /* ignore action frames to TDLS-peers */
3910                         if (ieee80211_is_action(hdr->frame_control) &&
3911                             !is_broadcast_ether_addr(bssid) &&
3912                             !ether_addr_equal(bssid, hdr->addr1))
3913                                 return false;
3914                 }
3915 
3916                 /*
3917                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3918                  * the BSSID - we've checked that already but may have accepted
3919                  * the wildcard (ff:ff:ff:ff:ff:ff).
3920                  *
3921                  * It also says:
3922                  *      The BSSID of the Data frame is determined as follows:
3923                  *      a) If the STA is contained within an AP or is associated
3924                  *         with an AP, the BSSID is the address currently in use
3925                  *         by the STA contained in the AP.
3926                  *
3927                  * So we should not accept data frames with an address that's
3928                  * multicast.
3929                  *
3930                  * Accepting it also opens a security problem because stations
3931                  * could encrypt it with the GTK and inject traffic that way.
3932                  */
3933                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3934                         return false;
3935 
3936                 return true;
3937         case NL80211_IFTYPE_WDS:
3938                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3939                         return false;
3940                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3941         case NL80211_IFTYPE_P2P_DEVICE:
3942                 return ieee80211_is_public_action(hdr, skb->len) ||
3943                        ieee80211_is_probe_req(hdr->frame_control) ||
3944                        ieee80211_is_probe_resp(hdr->frame_control) ||
3945                        ieee80211_is_beacon(hdr->frame_control);
3946         case NL80211_IFTYPE_NAN:
3947                 /* Currently no frames on NAN interface are allowed */
3948                 return false;
3949         default:
3950                 break;
3951         }
3952 
3953         WARN_ON_ONCE(1);
3954         return false;
3955 }
3956 
3957 void ieee80211_check_fast_rx(struct sta_info *sta)
3958 {
3959         struct ieee80211_sub_if_data *sdata = sta->sdata;
3960         struct ieee80211_local *local = sdata->local;
3961         struct ieee80211_key *key;
3962         struct ieee80211_fast_rx fastrx = {
3963                 .dev = sdata->dev,
3964                 .vif_type = sdata->vif.type,
3965                 .control_port_protocol = sdata->control_port_protocol,
3966         }, *old, *new = NULL;
3967         bool assign = false;
3968 
3969         /* use sparse to check that we don't return without updating */
3970         __acquire(check_fast_rx);
3971 
3972         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3973         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3974         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3975         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3976 
3977         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3978 
3979         /* fast-rx doesn't do reordering */
3980         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3981             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3982                 goto clear;
3983 
3984         switch (sdata->vif.type) {
3985         case NL80211_IFTYPE_STATION:
3986                 if (sta->sta.tdls) {
3987                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3988                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3989                         fastrx.expected_ds_bits = 0;
3990                 } else {
3991                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3992                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3993                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3994                         fastrx.expected_ds_bits =
3995                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3996                 }
3997 
3998                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3999                         fastrx.expected_ds_bits |=
4000                                 cpu_to_le16(IEEE80211_FCTL_TODS);
4001                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4002                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4003                 }
4004 
4005                 if (!sdata->u.mgd.powersave)
4006                         break;
4007 
4008                 /* software powersave is a huge mess, avoid all of it */
4009                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4010                         goto clear;
4011                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4012                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4013                         goto clear;
4014                 break;
4015         case NL80211_IFTYPE_AP_VLAN:
4016         case NL80211_IFTYPE_AP:
4017                 /* parallel-rx requires this, at least with calls to
4018                  * ieee80211_sta_ps_transition()
4019                  */
4020                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4021                         goto clear;
4022                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4023                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4024                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4025 
4026                 fastrx.internal_forward =
4027                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4028                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4029                          !sdata->u.vlan.sta);
4030 
4031                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4032                     sdata->u.vlan.sta) {
4033                         fastrx.expected_ds_bits |=
4034                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4035                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4036                         fastrx.internal_forward = 0;
4037                 }
4038 
4039                 break;
4040         default:
4041                 goto clear;
4042         }
4043 
4044         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4045                 goto clear;
4046 
4047         rcu_read_lock();
4048         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4049         if (key) {
4050                 switch (key->conf.cipher) {
4051                 case WLAN_CIPHER_SUITE_TKIP:
4052                         /* we don't want to deal with MMIC in fast-rx */
4053                         goto clear_rcu;
4054                 case WLAN_CIPHER_SUITE_CCMP:
4055                 case WLAN_CIPHER_SUITE_CCMP_256:
4056                 case WLAN_CIPHER_SUITE_GCMP:
4057                 case WLAN_CIPHER_SUITE_GCMP_256:
4058                         break;
4059                 default:
4060                         /* We also don't want to deal with
4061                          * WEP or cipher scheme.
4062                          */
4063                         goto clear_rcu;
4064                 }
4065 
4066                 fastrx.key = true;
4067                 fastrx.icv_len = key->conf.icv_len;
4068         }
4069 
4070         assign = true;
4071  clear_rcu:
4072         rcu_read_unlock();
4073  clear:
4074         __release(check_fast_rx);
4075 
4076         if (assign)
4077                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4078 
4079         spin_lock_bh(&sta->lock);
4080         old = rcu_dereference_protected(sta->fast_rx, true);
4081         rcu_assign_pointer(sta->fast_rx, new);
4082         spin_unlock_bh(&sta->lock);
4083 
4084         if (old)
4085                 kfree_rcu(old, rcu_head);
4086 }
4087 
4088 void ieee80211_clear_fast_rx(struct sta_info *sta)
4089 {
4090         struct ieee80211_fast_rx *old;
4091 
4092         spin_lock_bh(&sta->lock);
4093         old = rcu_dereference_protected(sta->fast_rx, true);
4094         RCU_INIT_POINTER(sta->fast_rx, NULL);
4095         spin_unlock_bh(&sta->lock);
4096 
4097         if (old)
4098                 kfree_rcu(old, rcu_head);
4099 }
4100 
4101 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4102 {
4103         struct ieee80211_local *local = sdata->local;
4104         struct sta_info *sta;
4105 
4106         lockdep_assert_held(&local->sta_mtx);
4107 
4108         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4109                 if (sdata != sta->sdata &&
4110                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4111                         continue;
4112                 ieee80211_check_fast_rx(sta);
4113         }
4114 }
4115 
4116 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4117 {
4118         struct ieee80211_local *local = sdata->local;
4119 
4120         mutex_lock(&local->sta_mtx);
4121         __ieee80211_check_fast_rx_iface(sdata);
4122         mutex_unlock(&local->sta_mtx);
4123 }
4124 
4125 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4126                                      struct ieee80211_fast_rx *fast_rx)
4127 {
4128         struct sk_buff *skb = rx->skb;
4129         struct ieee80211_hdr *hdr = (void *)skb->data;
4130         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4131         struct sta_info *sta = rx->sta;
4132         int orig_len = skb->len;
4133         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4134         int snap_offs = hdrlen;
4135         struct {
4136                 u8 snap[sizeof(rfc1042_header)];
4137                 __be16 proto;
4138         } *payload __aligned(2);
4139         struct {
4140                 u8 da[ETH_ALEN];
4141                 u8 sa[ETH_ALEN];
4142         } addrs __aligned(2);
4143         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4144 
4145         if (fast_rx->uses_rss)
4146                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4147 
4148         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4149          * to a common data structure; drivers can implement that per queue
4150          * but we don't have that information in mac80211
4151          */
4152         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4153                 return false;
4154 
4155 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4156 
4157         /* If using encryption, we also need to have:
4158          *  - PN_VALIDATED: similar, but the implementation is tricky
4159          *  - DECRYPTED: necessary for PN_VALIDATED
4160          */
4161         if (fast_rx->key &&
4162             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4163                 return false;
4164 
4165         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4166                 return false;
4167 
4168         if (unlikely(ieee80211_is_frag(hdr)))
4169                 return false;
4170 
4171         /* Since our interface address cannot be multicast, this
4172          * implicitly also rejects multicast frames without the
4173          * explicit check.
4174          *
4175          * We shouldn't get any *data* frames not addressed to us
4176          * (AP mode will accept multicast *management* frames), but
4177          * punting here will make it go through the full checks in
4178          * ieee80211_accept_frame().
4179          */
4180         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4181                 return false;
4182 
4183         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4184                                               IEEE80211_FCTL_TODS)) !=
4185             fast_rx->expected_ds_bits)
4186                 return false;
4187 
4188         /* assign the key to drop unencrypted frames (later)
4189          * and strip the IV/MIC if necessary
4190          */
4191         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4192                 /* GCMP header length is the same */
4193                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4194         }
4195 
4196         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4197                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4198                         goto drop;
4199 
4200                 payload = (void *)(skb->data + snap_offs);
4201 
4202                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4203                         return false;
4204 
4205                 /* Don't handle these here since they require special code.
4206                  * Accept AARP and IPX even though they should come with a
4207                  * bridge-tunnel header - but if we get them this way then
4208                  * there's little point in discarding them.
4209                  */
4210                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4211                              payload->proto == fast_rx->control_port_protocol))
4212                         return false;
4213         }
4214 
4215         /* after this point, don't punt to the slowpath! */
4216 
4217         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4218             pskb_trim(skb, skb->len - fast_rx->icv_len))
4219                 goto drop;
4220 
4221         if (unlikely(fast_rx->sta_notify)) {
4222                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4223                 fast_rx->sta_notify = false;
4224         }
4225 
4226         /* statistics part of ieee80211_rx_h_sta_process() */
4227         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4228                 stats->last_signal = status->signal;
4229                 if (!fast_rx->uses_rss)
4230                         ewma_signal_add(&sta->rx_stats_avg.signal,
4231                                         -status->signal);
4232         }
4233 
4234         if (status->chains) {
4235                 int i;
4236 
4237                 stats->chains = status->chains;
4238                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4239                         int signal = status->chain_signal[i];
4240 
4241                         if (!(status->chains & BIT(i)))
4242                                 continue;
4243 
4244                         stats->chain_signal_last[i] = signal;
4245                         if (!fast_rx->uses_rss)
4246                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4247                                                 -signal);
4248                 }
4249         }
4250         /* end of statistics */
4251 
4252         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4253                 goto drop;
4254 
4255         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4256                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4257                     RX_QUEUED)
4258                         goto drop;
4259 
4260                 return true;
4261         }
4262 
4263         stats->last_rx = jiffies;
4264         stats->last_rate = sta_stats_encode_rate(status);
4265 
4266         stats->fragments++;
4267         stats->packets++;
4268 
4269         /* do the header conversion - first grab the addresses */
4270         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4271         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4272         /* remove the SNAP but leave the ethertype */
4273         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4274         /* push the addresses in front */
4275         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4276 
4277         skb->dev = fast_rx->dev;
4278 
4279         ieee80211_rx_stats(fast_rx->dev, skb->len);
4280 
4281         /* The seqno index has the same property as needed
4282          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4283          * for non-QoS-data frames. Here we know it's a data
4284          * frame, so count MSDUs.
4285          */
4286         u64_stats_update_begin(&stats->syncp);
4287         stats->msdu[rx->seqno_idx]++;
4288         stats->bytes += orig_len;
4289         u64_stats_update_end(&stats->syncp);
4290 
4291         if (fast_rx->internal_forward) {
4292                 struct sk_buff *xmit_skb = NULL;
4293                 if (is_multicast_ether_addr(addrs.da)) {
4294                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4295                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4296                            sta_info_get(rx->sdata, addrs.da)) {
4297                         xmit_skb = skb;
4298                         skb = NULL;
4299                 }
4300 
4301                 if (xmit_skb) {
4302                         /*
4303                          * Send to wireless media and increase priority by 256
4304                          * to keep the received priority instead of
4305                          * reclassifying the frame (see cfg80211_classify8021d).
4306                          */
4307                         xmit_skb->priority += 256;
4308                         xmit_skb->protocol = htons(ETH_P_802_3);
4309                         skb_reset_network_header(xmit_skb);
4310                         skb_reset_mac_header(xmit_skb);
4311                         dev_queue_xmit(xmit_skb);
4312                 }
4313 
4314                 if (!skb)
4315                         return true;
4316         }
4317 
4318         /* deliver to local stack */
4319         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4320         memset(skb->cb, 0, sizeof(skb->cb));
4321         if (rx->napi)
4322                 napi_gro_receive(rx->napi, skb);
4323         else
4324                 netif_receive_skb(skb);
4325 
4326         return true;
4327  drop:
4328         dev_kfree_skb(skb);
4329         stats->dropped++;
4330         return true;
4331 }
4332 
4333 /*
4334  * This function returns whether or not the SKB
4335  * was destined for RX processing or not, which,
4336  * if consume is true, is equivalent to whether
4337  * or not the skb was consumed.
4338  */
4339 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4340                                             struct sk_buff *skb, bool consume)
4341 {
4342         struct ieee80211_local *local = rx->local;
4343         struct ieee80211_sub_if_data *sdata = rx->sdata;
4344 
4345         rx->skb = skb;
4346 
4347         /* See if we can do fast-rx; if we have to copy we already lost,
4348          * so punt in that case. We should never have to deliver a data
4349          * frame to multiple interfaces anyway.
4350          *
4351          * We skip the ieee80211_accept_frame() call and do the necessary
4352          * checking inside ieee80211_invoke_fast_rx().
4353          */
4354         if (consume && rx->sta) {
4355                 struct ieee80211_fast_rx *fast_rx;
4356 
4357                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4358                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4359                         return true;
4360         }
4361 
4362         if (!ieee80211_accept_frame(rx))
4363                 return false;
4364 
4365         if (!consume) {
4366                 skb = skb_copy(skb, GFP_ATOMIC);
4367                 if (!skb) {
4368                         if (net_ratelimit())
4369                                 wiphy_debug(local->hw.wiphy,
4370                                         "failed to copy skb for %s\n",
4371                                         sdata->name);
4372                         return true;
4373                 }
4374 
4375                 rx->skb = skb;
4376         }
4377 
4378         ieee80211_invoke_rx_handlers(rx);
4379         return true;
4380 }
4381 
4382 /*
4383  * This is the actual Rx frames handler. as it belongs to Rx path it must
4384  * be called with rcu_read_lock protection.
4385  */
4386 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4387                                          struct ieee80211_sta *pubsta,
4388                                          struct sk_buff *skb,
4389                                          struct napi_struct *napi)
4390 {
4391         struct ieee80211_local *local = hw_to_local(hw);
4392         struct ieee80211_sub_if_data *sdata;
4393         struct ieee80211_hdr *hdr;
4394         __le16 fc;
4395         struct ieee80211_rx_data rx;
4396         struct ieee80211_sub_if_data *prev;
4397         struct rhlist_head *tmp;
4398         int err = 0;
4399 
4400         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4401         memset(&rx, 0, sizeof(rx));
4402         rx.skb = skb;
4403         rx.local = local;
4404         rx.napi = napi;
4405 
4406         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4407                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4408 
4409         if (ieee80211_is_mgmt(fc)) {
4410                 /* drop frame if too short for header */
4411                 if (skb->len < ieee80211_hdrlen(fc))
4412                         err = -ENOBUFS;
4413                 else
4414                         err = skb_linearize(skb);
4415         } else {
4416                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4417         }
4418 
4419         if (err) {
4420                 dev_kfree_skb(skb);
4421                 return;
4422         }
4423 
4424         hdr = (struct ieee80211_hdr *)skb->data;
4425         ieee80211_parse_qos(&rx);
4426         ieee80211_verify_alignment(&rx);
4427 
4428         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4429                      ieee80211_is_beacon(hdr->frame_control)))
4430                 ieee80211_scan_rx(local, skb);
4431 
4432         if (ieee80211_is_data(fc)) {
4433                 struct sta_info *sta, *prev_sta;
4434 
4435                 if (pubsta) {
4436                         rx.sta = container_of(pubsta, struct sta_info, sta);
4437                         rx.sdata = rx.sta->sdata;
4438                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4439                                 return;
4440                         goto out;
4441                 }
4442 
4443                 prev_sta = NULL;
4444 
4445                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4446                         if (!prev_sta) {
4447                                 prev_sta = sta;
4448                                 continue;
4449                         }
4450 
4451                         rx.sta = prev_sta;
4452                         rx.sdata = prev_sta->sdata;
4453                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4454 
4455                         prev_sta = sta;
4456                 }
4457 
4458                 if (prev_sta) {
4459                         rx.sta = prev_sta;
4460                         rx.sdata = prev_sta->sdata;
4461 
4462                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4463                                 return;
4464                         goto out;
4465                 }
4466         }
4467 
4468         prev = NULL;
4469 
4470         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4471                 if (!ieee80211_sdata_running(sdata))
4472                         continue;
4473 
4474                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4475                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4476                         continue;
4477 
4478                 /*
4479                  * frame is destined for this interface, but if it's
4480                  * not also for the previous one we handle that after
4481                  * the loop to avoid copying the SKB once too much
4482                  */
4483 
4484                 if (!prev) {
4485                         prev = sdata;
4486                         continue;
4487                 }
4488 
4489                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4490                 rx.sdata = prev;
4491                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4492 
4493                 prev = sdata;
4494         }
4495 
4496         if (prev) {
4497                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4498                 rx.sdata = prev;
4499 
4500                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4501                         return;
4502         }
4503 
4504  out:
4505         dev_kfree_skb(skb);
4506 }
4507 
4508 /*
4509  * This is the receive path handler. It is called by a low level driver when an
4510  * 802.11 MPDU is received from the hardware.
4511  */
4512 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4513                        struct sk_buff *skb, struct napi_struct *napi)
4514 {
4515         struct ieee80211_local *local = hw_to_local(hw);
4516         struct ieee80211_rate *rate = NULL;
4517         struct ieee80211_supported_band *sband;
4518         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4519 
4520         WARN_ON_ONCE(softirq_count() == 0);
4521 
4522         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4523                 goto drop;
4524 
4525         sband = local->hw.wiphy->bands[status->band];
4526         if (WARN_ON(!sband))
4527                 goto drop;
4528 
4529         /*
4530          * If we're suspending, it is possible although not too likely
4531          * that we'd be receiving frames after having already partially
4532          * quiesced the stack. We can't process such frames then since
4533          * that might, for example, cause stations to be added or other
4534          * driver callbacks be invoked.
4535          */
4536         if (unlikely(local->quiescing || local->suspended))
4537                 goto drop;
4538 
4539         /* We might be during a HW reconfig, prevent Rx for the same reason */
4540         if (unlikely(local->in_reconfig))
4541                 goto drop;
4542 
4543         /*
4544          * The same happens when we're not even started,
4545          * but that's worth a warning.
4546          */
4547         if (WARN_ON(!local->started))
4548                 goto drop;
4549 
4550         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4551                 /*
4552                  * Validate the rate, unless a PLCP error means that
4553                  * we probably can't have a valid rate here anyway.
4554                  */
4555 
4556                 switch (status->encoding) {
4557                 case RX_ENC_HT:
4558                         /*
4559                          * rate_idx is MCS index, which can be [0-76]
4560                          * as documented on:
4561                          *
4562                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4563                          *
4564                          * Anything else would be some sort of driver or
4565                          * hardware error. The driver should catch hardware
4566                          * errors.
4567                          */
4568                         if (WARN(status->rate_idx > 76,
4569                                  "Rate marked as an HT rate but passed "
4570                                  "status->rate_idx is not "
4571                                  "an MCS index [0-76]: %d (0x%02x)\n",
4572                                  status->rate_idx,
4573                                  status->rate_idx))
4574                                 goto drop;
4575                         break;
4576                 case RX_ENC_VHT:
4577                         if (WARN_ONCE(status->rate_idx > 9 ||
4578                                       !status->nss ||
4579                                       status->nss > 8,
4580                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4581                                       status->rate_idx, status->nss))
4582                                 goto drop;
4583                         break;
4584                 case RX_ENC_HE:
4585                         if (WARN_ONCE(status->rate_idx > 11 ||
4586                                       !status->nss ||
4587                                       status->nss > 8,
4588                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4589                                       status->rate_idx, status->nss))
4590                                 goto drop;
4591                         break;
4592                 default:
4593                         WARN_ON_ONCE(1);
4594                         /* fall through */
4595                 case RX_ENC_LEGACY:
4596                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4597                                 goto drop;
4598                         rate = &sband->bitrates[status->rate_idx];
4599                 }
4600         }
4601 
4602         status->rx_flags = 0;
4603 
4604         /*
4605          * key references and virtual interfaces are protected using RCU
4606          * and this requires that we are in a read-side RCU section during
4607          * receive processing
4608          */
4609         rcu_read_lock();
4610 
4611         /*
4612          * Frames with failed FCS/PLCP checksum are not returned,
4613          * all other frames are returned without radiotap header
4614          * if it was previously present.
4615          * Also, frames with less than 16 bytes are dropped.
4616          */
4617         skb = ieee80211_rx_monitor(local, skb, rate);
4618         if (!skb) {
4619                 rcu_read_unlock();
4620                 return;
4621         }
4622 
4623         ieee80211_tpt_led_trig_rx(local,
4624                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4625                         skb->len);
4626 
4627         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4628 
4629         rcu_read_unlock();
4630 
4631         return;
4632  drop:
4633         kfree_skb(skb);
4634 }
4635 EXPORT_SYMBOL(ieee80211_rx_napi);
4636 
4637 /* This is a version of the rx handler that can be called from hard irq
4638  * context. Post the skb on the queue and schedule the tasklet */
4639 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4640 {
4641         struct ieee80211_local *local = hw_to_local(hw);
4642 
4643         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4644 
4645         skb->pkt_type = IEEE80211_RX_MSG;
4646         skb_queue_tail(&local->skb_queue, skb);
4647         tasklet_schedule(&local->tasklet);
4648 }
4649 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4650 

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