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TOMOYO Linux Cross Reference
Linux/net/mac80211/rx.c

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2005-2006, Devicescape Software, Inc.
  4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
  6  * Copyright 2013-2014  Intel Mobile Communications GmbH
  7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
  8  * Copyright (C) 2018-2019 Intel Corporation
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  */
 14 
 15 #include <linux/jiffies.h>
 16 #include <linux/slab.h>
 17 #include <linux/kernel.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/etherdevice.h>
 21 #include <linux/rcupdate.h>
 22 #include <linux/export.h>
 23 #include <linux/bitops.h>
 24 #include <net/mac80211.h>
 25 #include <net/ieee80211_radiotap.h>
 26 #include <asm/unaligned.h>
 27 
 28 #include "ieee80211_i.h"
 29 #include "driver-ops.h"
 30 #include "led.h"
 31 #include "mesh.h"
 32 #include "wep.h"
 33 #include "wpa.h"
 34 #include "tkip.h"
 35 #include "wme.h"
 36 #include "rate.h"
 37 
 38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
 39 {
 40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 41 
 42         u64_stats_update_begin(&tstats->syncp);
 43         tstats->rx_packets++;
 44         tstats->rx_bytes += len;
 45         u64_stats_update_end(&tstats->syncp);
 46 }
 47 
 48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
 49                                enum nl80211_iftype type)
 50 {
 51         __le16 fc = hdr->frame_control;
 52 
 53         if (ieee80211_is_data(fc)) {
 54                 if (len < 24) /* drop incorrect hdr len (data) */
 55                         return NULL;
 56 
 57                 if (ieee80211_has_a4(fc))
 58                         return NULL;
 59                 if (ieee80211_has_tods(fc))
 60                         return hdr->addr1;
 61                 if (ieee80211_has_fromds(fc))
 62                         return hdr->addr2;
 63 
 64                 return hdr->addr3;
 65         }
 66 
 67         if (ieee80211_is_mgmt(fc)) {
 68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
 69                         return NULL;
 70                 return hdr->addr3;
 71         }
 72 
 73         if (ieee80211_is_ctl(fc)) {
 74                 if (ieee80211_is_pspoll(fc))
 75                         return hdr->addr1;
 76 
 77                 if (ieee80211_is_back_req(fc)) {
 78                         switch (type) {
 79                         case NL80211_IFTYPE_STATION:
 80                                 return hdr->addr2;
 81                         case NL80211_IFTYPE_AP:
 82                         case NL80211_IFTYPE_AP_VLAN:
 83                                 return hdr->addr1;
 84                         default:
 85                                 break; /* fall through to the return */
 86                         }
 87                 }
 88         }
 89 
 90         return NULL;
 91 }
 92 
 93 /*
 94  * monitor mode reception
 95  *
 96  * This function cleans up the SKB, i.e. it removes all the stuff
 97  * only useful for monitoring.
 98  */
 99 static void remove_monitor_info(struct sk_buff *skb,
100                                 unsigned int present_fcs_len,
101                                 unsigned int rtap_space)
102 {
103         if (present_fcs_len)
104                 __pskb_trim(skb, skb->len - present_fcs_len);
105         __pskb_pull(skb, rtap_space);
106 }
107 
108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
109                                      unsigned int rtap_space)
110 {
111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
112         struct ieee80211_hdr *hdr;
113 
114         hdr = (void *)(skb->data + rtap_space);
115 
116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
117                             RX_FLAG_FAILED_PLCP_CRC |
118                             RX_FLAG_ONLY_MONITOR |
119                             RX_FLAG_NO_PSDU))
120                 return true;
121 
122         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
123                 return true;
124 
125         if (ieee80211_is_ctl(hdr->frame_control) &&
126             !ieee80211_is_pspoll(hdr->frame_control) &&
127             !ieee80211_is_back_req(hdr->frame_control))
128                 return true;
129 
130         return false;
131 }
132 
133 static int
134 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
135                              struct ieee80211_rx_status *status,
136                              struct sk_buff *skb)
137 {
138         int len;
139 
140         /* always present fields */
141         len = sizeof(struct ieee80211_radiotap_header) + 8;
142 
143         /* allocate extra bitmaps */
144         if (status->chains)
145                 len += 4 * hweight8(status->chains);
146         /* vendor presence bitmap */
147         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
148                 len += 4;
149 
150         if (ieee80211_have_rx_timestamp(status)) {
151                 len = ALIGN(len, 8);
152                 len += 8;
153         }
154         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
155                 len += 1;
156 
157         /* antenna field, if we don't have per-chain info */
158         if (!status->chains)
159                 len += 1;
160 
161         /* padding for RX_FLAGS if necessary */
162         len = ALIGN(len, 2);
163 
164         if (status->encoding == RX_ENC_HT) /* HT info */
165                 len += 3;
166 
167         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
168                 len = ALIGN(len, 4);
169                 len += 8;
170         }
171 
172         if (status->encoding == RX_ENC_VHT) {
173                 len = ALIGN(len, 2);
174                 len += 12;
175         }
176 
177         if (local->hw.radiotap_timestamp.units_pos >= 0) {
178                 len = ALIGN(len, 8);
179                 len += 12;
180         }
181 
182         if (status->encoding == RX_ENC_HE &&
183             status->flag & RX_FLAG_RADIOTAP_HE) {
184                 len = ALIGN(len, 2);
185                 len += 12;
186                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
187         }
188 
189         if (status->encoding == RX_ENC_HE &&
190             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
191                 len = ALIGN(len, 2);
192                 len += 12;
193                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
194         }
195 
196         if (status->flag & RX_FLAG_NO_PSDU)
197                 len += 1;
198 
199         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
200                 len = ALIGN(len, 2);
201                 len += 4;
202                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
203         }
204 
205         if (status->chains) {
206                 /* antenna and antenna signal fields */
207                 len += 2 * hweight8(status->chains);
208         }
209 
210         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
211                 struct ieee80211_vendor_radiotap *rtap;
212                 int vendor_data_offset = 0;
213 
214                 /*
215                  * The position to look at depends on the existence (or non-
216                  * existence) of other elements, so take that into account...
217                  */
218                 if (status->flag & RX_FLAG_RADIOTAP_HE)
219                         vendor_data_offset +=
220                                 sizeof(struct ieee80211_radiotap_he);
221                 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
222                         vendor_data_offset +=
223                                 sizeof(struct ieee80211_radiotap_he_mu);
224                 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
225                         vendor_data_offset +=
226                                 sizeof(struct ieee80211_radiotap_lsig);
227 
228                 rtap = (void *)&skb->data[vendor_data_offset];
229 
230                 /* alignment for fixed 6-byte vendor data header */
231                 len = ALIGN(len, 2);
232                 /* vendor data header */
233                 len += 6;
234                 if (WARN_ON(rtap->align == 0))
235                         rtap->align = 1;
236                 len = ALIGN(len, rtap->align);
237                 len += rtap->len + rtap->pad;
238         }
239 
240         return len;
241 }
242 
243 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
244                                          struct sk_buff *skb,
245                                          int rtap_space)
246 {
247         struct {
248                 struct ieee80211_hdr_3addr hdr;
249                 u8 category;
250                 u8 action_code;
251         } __packed __aligned(2) action;
252 
253         if (!sdata)
254                 return;
255 
256         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
257 
258         if (skb->len < rtap_space + sizeof(action) +
259                        VHT_MUMIMO_GROUPS_DATA_LEN)
260                 return;
261 
262         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
263                 return;
264 
265         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
266 
267         if (!ieee80211_is_action(action.hdr.frame_control))
268                 return;
269 
270         if (action.category != WLAN_CATEGORY_VHT)
271                 return;
272 
273         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
274                 return;
275 
276         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
277                 return;
278 
279         skb = skb_copy(skb, GFP_ATOMIC);
280         if (!skb)
281                 return;
282 
283         skb_queue_tail(&sdata->skb_queue, skb);
284         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
285 }
286 
287 /*
288  * ieee80211_add_rx_radiotap_header - add radiotap header
289  *
290  * add a radiotap header containing all the fields which the hardware provided.
291  */
292 static void
293 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
294                                  struct sk_buff *skb,
295                                  struct ieee80211_rate *rate,
296                                  int rtap_len, bool has_fcs)
297 {
298         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
299         struct ieee80211_radiotap_header *rthdr;
300         unsigned char *pos;
301         __le32 *it_present;
302         u32 it_present_val;
303         u16 rx_flags = 0;
304         u16 channel_flags = 0;
305         int mpdulen, chain;
306         unsigned long chains = status->chains;
307         struct ieee80211_vendor_radiotap rtap = {};
308         struct ieee80211_radiotap_he he = {};
309         struct ieee80211_radiotap_he_mu he_mu = {};
310         struct ieee80211_radiotap_lsig lsig = {};
311 
312         if (status->flag & RX_FLAG_RADIOTAP_HE) {
313                 he = *(struct ieee80211_radiotap_he *)skb->data;
314                 skb_pull(skb, sizeof(he));
315                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
316         }
317 
318         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
319                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
320                 skb_pull(skb, sizeof(he_mu));
321         }
322 
323         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
324                 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
325                 skb_pull(skb, sizeof(lsig));
326         }
327 
328         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
329                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
330                 /* rtap.len and rtap.pad are undone immediately */
331                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
332         }
333 
334         mpdulen = skb->len;
335         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
336                 mpdulen += FCS_LEN;
337 
338         rthdr = skb_push(skb, rtap_len);
339         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
340         it_present = &rthdr->it_present;
341 
342         /* radiotap header, set always present flags */
343         rthdr->it_len = cpu_to_le16(rtap_len);
344         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
345                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
346                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
347 
348         if (!status->chains)
349                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
350 
351         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
352                 it_present_val |=
353                         BIT(IEEE80211_RADIOTAP_EXT) |
354                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
355                 put_unaligned_le32(it_present_val, it_present);
356                 it_present++;
357                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
358                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
359         }
360 
361         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
362                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
363                                   BIT(IEEE80211_RADIOTAP_EXT);
364                 put_unaligned_le32(it_present_val, it_present);
365                 it_present++;
366                 it_present_val = rtap.present;
367         }
368 
369         put_unaligned_le32(it_present_val, it_present);
370 
371         pos = (void *)(it_present + 1);
372 
373         /* the order of the following fields is important */
374 
375         /* IEEE80211_RADIOTAP_TSFT */
376         if (ieee80211_have_rx_timestamp(status)) {
377                 /* padding */
378                 while ((pos - (u8 *)rthdr) & 7)
379                         *pos++ = 0;
380                 put_unaligned_le64(
381                         ieee80211_calculate_rx_timestamp(local, status,
382                                                          mpdulen, 0),
383                         pos);
384                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
385                 pos += 8;
386         }
387 
388         /* IEEE80211_RADIOTAP_FLAGS */
389         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
390                 *pos |= IEEE80211_RADIOTAP_F_FCS;
391         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
392                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
393         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
394                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
395         pos++;
396 
397         /* IEEE80211_RADIOTAP_RATE */
398         if (!rate || status->encoding != RX_ENC_LEGACY) {
399                 /*
400                  * Without rate information don't add it. If we have,
401                  * MCS information is a separate field in radiotap,
402                  * added below. The byte here is needed as padding
403                  * for the channel though, so initialise it to 0.
404                  */
405                 *pos = 0;
406         } else {
407                 int shift = 0;
408                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
409                 if (status->bw == RATE_INFO_BW_10)
410                         shift = 1;
411                 else if (status->bw == RATE_INFO_BW_5)
412                         shift = 2;
413                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
414         }
415         pos++;
416 
417         /* IEEE80211_RADIOTAP_CHANNEL */
418         put_unaligned_le16(status->freq, pos);
419         pos += 2;
420         if (status->bw == RATE_INFO_BW_10)
421                 channel_flags |= IEEE80211_CHAN_HALF;
422         else if (status->bw == RATE_INFO_BW_5)
423                 channel_flags |= IEEE80211_CHAN_QUARTER;
424 
425         if (status->band == NL80211_BAND_5GHZ)
426                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
427         else if (status->encoding != RX_ENC_LEGACY)
428                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
429         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
430                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
431         else if (rate)
432                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
433         else
434                 channel_flags |= IEEE80211_CHAN_2GHZ;
435         put_unaligned_le16(channel_flags, pos);
436         pos += 2;
437 
438         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
439         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
440             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
441                 *pos = status->signal;
442                 rthdr->it_present |=
443                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
444                 pos++;
445         }
446 
447         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
448 
449         if (!status->chains) {
450                 /* IEEE80211_RADIOTAP_ANTENNA */
451                 *pos = status->antenna;
452                 pos++;
453         }
454 
455         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
456 
457         /* IEEE80211_RADIOTAP_RX_FLAGS */
458         /* ensure 2 byte alignment for the 2 byte field as required */
459         if ((pos - (u8 *)rthdr) & 1)
460                 *pos++ = 0;
461         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
462                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
463         put_unaligned_le16(rx_flags, pos);
464         pos += 2;
465 
466         if (status->encoding == RX_ENC_HT) {
467                 unsigned int stbc;
468 
469                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
470                 *pos++ = local->hw.radiotap_mcs_details;
471                 *pos = 0;
472                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
473                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
474                 if (status->bw == RATE_INFO_BW_40)
475                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
476                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
477                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
478                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
479                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
480                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
481                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
482                 pos++;
483                 *pos++ = status->rate_idx;
484         }
485 
486         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
487                 u16 flags = 0;
488 
489                 /* ensure 4 byte alignment */
490                 while ((pos - (u8 *)rthdr) & 3)
491                         pos++;
492                 rthdr->it_present |=
493                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
494                 put_unaligned_le32(status->ampdu_reference, pos);
495                 pos += 4;
496                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
497                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
498                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
499                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
500                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
501                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
502                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
503                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
504                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
505                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
506                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
507                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
508                 put_unaligned_le16(flags, pos);
509                 pos += 2;
510                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
511                         *pos++ = status->ampdu_delimiter_crc;
512                 else
513                         *pos++ = 0;
514                 *pos++ = 0;
515         }
516 
517         if (status->encoding == RX_ENC_VHT) {
518                 u16 known = local->hw.radiotap_vht_details;
519 
520                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
521                 put_unaligned_le16(known, pos);
522                 pos += 2;
523                 /* flags */
524                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
525                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
526                 /* in VHT, STBC is binary */
527                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
528                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
529                 if (status->enc_flags & RX_ENC_FLAG_BF)
530                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
531                 pos++;
532                 /* bandwidth */
533                 switch (status->bw) {
534                 case RATE_INFO_BW_80:
535                         *pos++ = 4;
536                         break;
537                 case RATE_INFO_BW_160:
538                         *pos++ = 11;
539                         break;
540                 case RATE_INFO_BW_40:
541                         *pos++ = 1;
542                         break;
543                 default:
544                         *pos++ = 0;
545                 }
546                 /* MCS/NSS */
547                 *pos = (status->rate_idx << 4) | status->nss;
548                 pos += 4;
549                 /* coding field */
550                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
551                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
552                 pos++;
553                 /* group ID */
554                 pos++;
555                 /* partial_aid */
556                 pos += 2;
557         }
558 
559         if (local->hw.radiotap_timestamp.units_pos >= 0) {
560                 u16 accuracy = 0;
561                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
562 
563                 rthdr->it_present |=
564                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
565 
566                 /* ensure 8 byte alignment */
567                 while ((pos - (u8 *)rthdr) & 7)
568                         pos++;
569 
570                 put_unaligned_le64(status->device_timestamp, pos);
571                 pos += sizeof(u64);
572 
573                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
574                         accuracy = local->hw.radiotap_timestamp.accuracy;
575                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
576                 }
577                 put_unaligned_le16(accuracy, pos);
578                 pos += sizeof(u16);
579 
580                 *pos++ = local->hw.radiotap_timestamp.units_pos;
581                 *pos++ = flags;
582         }
583 
584         if (status->encoding == RX_ENC_HE &&
585             status->flag & RX_FLAG_RADIOTAP_HE) {
586 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
587 
588                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
589                         he.data6 |= HE_PREP(DATA6_NSTS,
590                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
591                                                       status->enc_flags));
592                         he.data3 |= HE_PREP(DATA3_STBC, 1);
593                 } else {
594                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
595                 }
596 
597 #define CHECK_GI(s) \
598         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
599                      (int)NL80211_RATE_INFO_HE_GI_##s)
600 
601                 CHECK_GI(0_8);
602                 CHECK_GI(1_6);
603                 CHECK_GI(3_2);
604 
605                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
606                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
607                 he.data3 |= HE_PREP(DATA3_CODING,
608                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
609 
610                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
611 
612                 switch (status->bw) {
613                 case RATE_INFO_BW_20:
614                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
615                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
616                         break;
617                 case RATE_INFO_BW_40:
618                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
619                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
620                         break;
621                 case RATE_INFO_BW_80:
622                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
623                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
624                         break;
625                 case RATE_INFO_BW_160:
626                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
627                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
628                         break;
629                 case RATE_INFO_BW_HE_RU:
630 #define CHECK_RU_ALLOC(s) \
631         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
632                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
633 
634                         CHECK_RU_ALLOC(26);
635                         CHECK_RU_ALLOC(52);
636                         CHECK_RU_ALLOC(106);
637                         CHECK_RU_ALLOC(242);
638                         CHECK_RU_ALLOC(484);
639                         CHECK_RU_ALLOC(996);
640                         CHECK_RU_ALLOC(2x996);
641 
642                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
643                                             status->he_ru + 4);
644                         break;
645                 default:
646                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
647                 }
648 
649                 /* ensure 2 byte alignment */
650                 while ((pos - (u8 *)rthdr) & 1)
651                         pos++;
652                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
653                 memcpy(pos, &he, sizeof(he));
654                 pos += sizeof(he);
655         }
656 
657         if (status->encoding == RX_ENC_HE &&
658             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
659                 /* ensure 2 byte alignment */
660                 while ((pos - (u8 *)rthdr) & 1)
661                         pos++;
662                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
663                 memcpy(pos, &he_mu, sizeof(he_mu));
664                 pos += sizeof(he_mu);
665         }
666 
667         if (status->flag & RX_FLAG_NO_PSDU) {
668                 rthdr->it_present |=
669                         cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
670                 *pos++ = status->zero_length_psdu_type;
671         }
672 
673         if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
674                 /* ensure 2 byte alignment */
675                 while ((pos - (u8 *)rthdr) & 1)
676                         pos++;
677                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
678                 memcpy(pos, &lsig, sizeof(lsig));
679                 pos += sizeof(lsig);
680         }
681 
682         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
683                 *pos++ = status->chain_signal[chain];
684                 *pos++ = chain;
685         }
686 
687         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
688                 /* ensure 2 byte alignment for the vendor field as required */
689                 if ((pos - (u8 *)rthdr) & 1)
690                         *pos++ = 0;
691                 *pos++ = rtap.oui[0];
692                 *pos++ = rtap.oui[1];
693                 *pos++ = rtap.oui[2];
694                 *pos++ = rtap.subns;
695                 put_unaligned_le16(rtap.len, pos);
696                 pos += 2;
697                 /* align the actual payload as requested */
698                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
699                         *pos++ = 0;
700                 /* data (and possible padding) already follows */
701         }
702 }
703 
704 static struct sk_buff *
705 ieee80211_make_monitor_skb(struct ieee80211_local *local,
706                            struct sk_buff **origskb,
707                            struct ieee80211_rate *rate,
708                            int rtap_space, bool use_origskb)
709 {
710         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
711         int rt_hdrlen, needed_headroom;
712         struct sk_buff *skb;
713 
714         /* room for the radiotap header based on driver features */
715         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
716         needed_headroom = rt_hdrlen - rtap_space;
717 
718         if (use_origskb) {
719                 /* only need to expand headroom if necessary */
720                 skb = *origskb;
721                 *origskb = NULL;
722 
723                 /*
724                  * This shouldn't trigger often because most devices have an
725                  * RX header they pull before we get here, and that should
726                  * be big enough for our radiotap information. We should
727                  * probably export the length to drivers so that we can have
728                  * them allocate enough headroom to start with.
729                  */
730                 if (skb_headroom(skb) < needed_headroom &&
731                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
732                         dev_kfree_skb(skb);
733                         return NULL;
734                 }
735         } else {
736                 /*
737                  * Need to make a copy and possibly remove radiotap header
738                  * and FCS from the original.
739                  */
740                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
741 
742                 if (!skb)
743                         return NULL;
744         }
745 
746         /* prepend radiotap information */
747         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
748 
749         skb_reset_mac_header(skb);
750         skb->ip_summed = CHECKSUM_UNNECESSARY;
751         skb->pkt_type = PACKET_OTHERHOST;
752         skb->protocol = htons(ETH_P_802_2);
753 
754         return skb;
755 }
756 
757 /*
758  * This function copies a received frame to all monitor interfaces and
759  * returns a cleaned-up SKB that no longer includes the FCS nor the
760  * radiotap header the driver might have added.
761  */
762 static struct sk_buff *
763 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
764                      struct ieee80211_rate *rate)
765 {
766         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
767         struct ieee80211_sub_if_data *sdata;
768         struct sk_buff *monskb = NULL;
769         int present_fcs_len = 0;
770         unsigned int rtap_space = 0;
771         struct ieee80211_sub_if_data *monitor_sdata =
772                 rcu_dereference(local->monitor_sdata);
773         bool only_monitor = false;
774         unsigned int min_head_len;
775 
776         if (status->flag & RX_FLAG_RADIOTAP_HE)
777                 rtap_space += sizeof(struct ieee80211_radiotap_he);
778 
779         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
780                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
781 
782         if (status->flag & RX_FLAG_RADIOTAP_LSIG)
783                 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
784 
785         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
786                 struct ieee80211_vendor_radiotap *rtap =
787                         (void *)(origskb->data + rtap_space);
788 
789                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
790         }
791 
792         min_head_len = rtap_space;
793 
794         /*
795          * First, we may need to make a copy of the skb because
796          *  (1) we need to modify it for radiotap (if not present), and
797          *  (2) the other RX handlers will modify the skb we got.
798          *
799          * We don't need to, of course, if we aren't going to return
800          * the SKB because it has a bad FCS/PLCP checksum.
801          */
802 
803         if (!(status->flag & RX_FLAG_NO_PSDU)) {
804                 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
805                         if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
806                                 /* driver bug */
807                                 WARN_ON(1);
808                                 dev_kfree_skb(origskb);
809                                 return NULL;
810                         }
811                         present_fcs_len = FCS_LEN;
812                 }
813 
814                 /* also consider the hdr->frame_control */
815                 min_head_len += 2;
816         }
817 
818         /* ensure that the expected data elements are in skb head */
819         if (!pskb_may_pull(origskb, min_head_len)) {
820                 dev_kfree_skb(origskb);
821                 return NULL;
822         }
823 
824         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
825 
826         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
827                 if (only_monitor) {
828                         dev_kfree_skb(origskb);
829                         return NULL;
830                 }
831 
832                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
833                 return origskb;
834         }
835 
836         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
837 
838         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
839                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
840                                                  &local->mon_list);
841 
842                 if (!monskb)
843                         monskb = ieee80211_make_monitor_skb(local, &origskb,
844                                                             rate, rtap_space,
845                                                             only_monitor &&
846                                                             last_monitor);
847 
848                 if (monskb) {
849                         struct sk_buff *skb;
850 
851                         if (last_monitor) {
852                                 skb = monskb;
853                                 monskb = NULL;
854                         } else {
855                                 skb = skb_clone(monskb, GFP_ATOMIC);
856                         }
857 
858                         if (skb) {
859                                 skb->dev = sdata->dev;
860                                 ieee80211_rx_stats(skb->dev, skb->len);
861                                 netif_receive_skb(skb);
862                         }
863                 }
864 
865                 if (last_monitor)
866                         break;
867         }
868 
869         /* this happens if last_monitor was erroneously false */
870         dev_kfree_skb(monskb);
871 
872         /* ditto */
873         if (!origskb)
874                 return NULL;
875 
876         remove_monitor_info(origskb, present_fcs_len, rtap_space);
877         return origskb;
878 }
879 
880 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
881 {
882         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
883         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
884         int tid, seqno_idx, security_idx;
885 
886         /* does the frame have a qos control field? */
887         if (ieee80211_is_data_qos(hdr->frame_control)) {
888                 u8 *qc = ieee80211_get_qos_ctl(hdr);
889                 /* frame has qos control */
890                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
891                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
892                         status->rx_flags |= IEEE80211_RX_AMSDU;
893 
894                 seqno_idx = tid;
895                 security_idx = tid;
896         } else {
897                 /*
898                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
899                  *
900                  *      Sequence numbers for management frames, QoS data
901                  *      frames with a broadcast/multicast address in the
902                  *      Address 1 field, and all non-QoS data frames sent
903                  *      by QoS STAs are assigned using an additional single
904                  *      modulo-4096 counter, [...]
905                  *
906                  * We also use that counter for non-QoS STAs.
907                  */
908                 seqno_idx = IEEE80211_NUM_TIDS;
909                 security_idx = 0;
910                 if (ieee80211_is_mgmt(hdr->frame_control))
911                         security_idx = IEEE80211_NUM_TIDS;
912                 tid = 0;
913         }
914 
915         rx->seqno_idx = seqno_idx;
916         rx->security_idx = security_idx;
917         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
918          * For now, set skb->priority to 0 for other cases. */
919         rx->skb->priority = (tid > 7) ? 0 : tid;
920 }
921 
922 /**
923  * DOC: Packet alignment
924  *
925  * Drivers always need to pass packets that are aligned to two-byte boundaries
926  * to the stack.
927  *
928  * Additionally, should, if possible, align the payload data in a way that
929  * guarantees that the contained IP header is aligned to a four-byte
930  * boundary. In the case of regular frames, this simply means aligning the
931  * payload to a four-byte boundary (because either the IP header is directly
932  * contained, or IV/RFC1042 headers that have a length divisible by four are
933  * in front of it).  If the payload data is not properly aligned and the
934  * architecture doesn't support efficient unaligned operations, mac80211
935  * will align the data.
936  *
937  * With A-MSDU frames, however, the payload data address must yield two modulo
938  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
939  * push the IP header further back to a multiple of four again. Thankfully, the
940  * specs were sane enough this time around to require padding each A-MSDU
941  * subframe to a length that is a multiple of four.
942  *
943  * Padding like Atheros hardware adds which is between the 802.11 header and
944  * the payload is not supported, the driver is required to move the 802.11
945  * header to be directly in front of the payload in that case.
946  */
947 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
948 {
949 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
950         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
951 #endif
952 }
953 
954 
955 /* rx handlers */
956 
957 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
958 {
959         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
960 
961         if (is_multicast_ether_addr(hdr->addr1))
962                 return 0;
963 
964         return ieee80211_is_robust_mgmt_frame(skb);
965 }
966 
967 
968 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
969 {
970         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
971 
972         if (!is_multicast_ether_addr(hdr->addr1))
973                 return 0;
974 
975         return ieee80211_is_robust_mgmt_frame(skb);
976 }
977 
978 
979 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
980 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
981 {
982         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
983         struct ieee80211_mmie *mmie;
984         struct ieee80211_mmie_16 *mmie16;
985 
986         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
987                 return -1;
988 
989         if (!ieee80211_is_robust_mgmt_frame(skb))
990                 return -1; /* not a robust management frame */
991 
992         mmie = (struct ieee80211_mmie *)
993                 (skb->data + skb->len - sizeof(*mmie));
994         if (mmie->element_id == WLAN_EID_MMIE &&
995             mmie->length == sizeof(*mmie) - 2)
996                 return le16_to_cpu(mmie->key_id);
997 
998         mmie16 = (struct ieee80211_mmie_16 *)
999                 (skb->data + skb->len - sizeof(*mmie16));
1000         if (skb->len >= 24 + sizeof(*mmie16) &&
1001             mmie16->element_id == WLAN_EID_MMIE &&
1002             mmie16->length == sizeof(*mmie16) - 2)
1003                 return le16_to_cpu(mmie16->key_id);
1004 
1005         return -1;
1006 }
1007 
1008 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
1009                                   struct sk_buff *skb)
1010 {
1011         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1012         __le16 fc;
1013         int hdrlen;
1014         u8 keyid;
1015 
1016         fc = hdr->frame_control;
1017         hdrlen = ieee80211_hdrlen(fc);
1018 
1019         if (skb->len < hdrlen + cs->hdr_len)
1020                 return -EINVAL;
1021 
1022         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
1023         keyid &= cs->key_idx_mask;
1024         keyid >>= cs->key_idx_shift;
1025 
1026         return keyid;
1027 }
1028 
1029 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
1030 {
1031         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1032         char *dev_addr = rx->sdata->vif.addr;
1033 
1034         if (ieee80211_is_data(hdr->frame_control)) {
1035                 if (is_multicast_ether_addr(hdr->addr1)) {
1036                         if (ieee80211_has_tods(hdr->frame_control) ||
1037                             !ieee80211_has_fromds(hdr->frame_control))
1038                                 return RX_DROP_MONITOR;
1039                         if (ether_addr_equal(hdr->addr3, dev_addr))
1040                                 return RX_DROP_MONITOR;
1041                 } else {
1042                         if (!ieee80211_has_a4(hdr->frame_control))
1043                                 return RX_DROP_MONITOR;
1044                         if (ether_addr_equal(hdr->addr4, dev_addr))
1045                                 return RX_DROP_MONITOR;
1046                 }
1047         }
1048 
1049         /* If there is not an established peer link and this is not a peer link
1050          * establisment frame, beacon or probe, drop the frame.
1051          */
1052 
1053         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
1054                 struct ieee80211_mgmt *mgmt;
1055 
1056                 if (!ieee80211_is_mgmt(hdr->frame_control))
1057                         return RX_DROP_MONITOR;
1058 
1059                 if (ieee80211_is_action(hdr->frame_control)) {
1060                         u8 category;
1061 
1062                         /* make sure category field is present */
1063                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1064                                 return RX_DROP_MONITOR;
1065 
1066                         mgmt = (struct ieee80211_mgmt *)hdr;
1067                         category = mgmt->u.action.category;
1068                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1069                             category != WLAN_CATEGORY_SELF_PROTECTED)
1070                                 return RX_DROP_MONITOR;
1071                         return RX_CONTINUE;
1072                 }
1073 
1074                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1075                     ieee80211_is_probe_resp(hdr->frame_control) ||
1076                     ieee80211_is_beacon(hdr->frame_control) ||
1077                     ieee80211_is_auth(hdr->frame_control))
1078                         return RX_CONTINUE;
1079 
1080                 return RX_DROP_MONITOR;
1081         }
1082 
1083         return RX_CONTINUE;
1084 }
1085 
1086 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1087                                               int index)
1088 {
1089         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1090         struct sk_buff *tail = skb_peek_tail(frames);
1091         struct ieee80211_rx_status *status;
1092 
1093         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1094                 return true;
1095 
1096         if (!tail)
1097                 return false;
1098 
1099         status = IEEE80211_SKB_RXCB(tail);
1100         if (status->flag & RX_FLAG_AMSDU_MORE)
1101                 return false;
1102 
1103         return true;
1104 }
1105 
1106 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1107                                             struct tid_ampdu_rx *tid_agg_rx,
1108                                             int index,
1109                                             struct sk_buff_head *frames)
1110 {
1111         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1112         struct sk_buff *skb;
1113         struct ieee80211_rx_status *status;
1114 
1115         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1116 
1117         if (skb_queue_empty(skb_list))
1118                 goto no_frame;
1119 
1120         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1121                 __skb_queue_purge(skb_list);
1122                 goto no_frame;
1123         }
1124 
1125         /* release frames from the reorder ring buffer */
1126         tid_agg_rx->stored_mpdu_num--;
1127         while ((skb = __skb_dequeue(skb_list))) {
1128                 status = IEEE80211_SKB_RXCB(skb);
1129                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1130                 __skb_queue_tail(frames, skb);
1131         }
1132 
1133 no_frame:
1134         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1135         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1136 }
1137 
1138 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1139                                              struct tid_ampdu_rx *tid_agg_rx,
1140                                              u16 head_seq_num,
1141                                              struct sk_buff_head *frames)
1142 {
1143         int index;
1144 
1145         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1146 
1147         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1148                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1149                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1150                                                 frames);
1151         }
1152 }
1153 
1154 /*
1155  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1156  * the skb was added to the buffer longer than this time ago, the earlier
1157  * frames that have not yet been received are assumed to be lost and the skb
1158  * can be released for processing. This may also release other skb's from the
1159  * reorder buffer if there are no additional gaps between the frames.
1160  *
1161  * Callers must hold tid_agg_rx->reorder_lock.
1162  */
1163 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1164 
1165 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1166                                           struct tid_ampdu_rx *tid_agg_rx,
1167                                           struct sk_buff_head *frames)
1168 {
1169         int index, i, j;
1170 
1171         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1172 
1173         /* release the buffer until next missing frame */
1174         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1175         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1176             tid_agg_rx->stored_mpdu_num) {
1177                 /*
1178                  * No buffers ready to be released, but check whether any
1179                  * frames in the reorder buffer have timed out.
1180                  */
1181                 int skipped = 1;
1182                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1183                      j = (j + 1) % tid_agg_rx->buf_size) {
1184                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1185                                 skipped++;
1186                                 continue;
1187                         }
1188                         if (skipped &&
1189                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1190                                         HT_RX_REORDER_BUF_TIMEOUT))
1191                                 goto set_release_timer;
1192 
1193                         /* don't leave incomplete A-MSDUs around */
1194                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1195                              i = (i + 1) % tid_agg_rx->buf_size)
1196                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1197 
1198                         ht_dbg_ratelimited(sdata,
1199                                            "release an RX reorder frame due to timeout on earlier frames\n");
1200                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1201                                                         frames);
1202 
1203                         /*
1204                          * Increment the head seq# also for the skipped slots.
1205                          */
1206                         tid_agg_rx->head_seq_num =
1207                                 (tid_agg_rx->head_seq_num +
1208                                  skipped) & IEEE80211_SN_MASK;
1209                         skipped = 0;
1210                 }
1211         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1212                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1213                                                 frames);
1214                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1215         }
1216 
1217         if (tid_agg_rx->stored_mpdu_num) {
1218                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1219 
1220                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1221                      j = (j + 1) % tid_agg_rx->buf_size) {
1222                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1223                                 break;
1224                 }
1225 
1226  set_release_timer:
1227 
1228                 if (!tid_agg_rx->removed)
1229                         mod_timer(&tid_agg_rx->reorder_timer,
1230                                   tid_agg_rx->reorder_time[j] + 1 +
1231                                   HT_RX_REORDER_BUF_TIMEOUT);
1232         } else {
1233                 del_timer(&tid_agg_rx->reorder_timer);
1234         }
1235 }
1236 
1237 /*
1238  * As this function belongs to the RX path it must be under
1239  * rcu_read_lock protection. It returns false if the frame
1240  * can be processed immediately, true if it was consumed.
1241  */
1242 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1243                                              struct tid_ampdu_rx *tid_agg_rx,
1244                                              struct sk_buff *skb,
1245                                              struct sk_buff_head *frames)
1246 {
1247         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1248         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1249         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1250         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1251         u16 head_seq_num, buf_size;
1252         int index;
1253         bool ret = true;
1254 
1255         spin_lock(&tid_agg_rx->reorder_lock);
1256 
1257         /*
1258          * Offloaded BA sessions have no known starting sequence number so pick
1259          * one from first Rxed frame for this tid after BA was started.
1260          */
1261         if (unlikely(tid_agg_rx->auto_seq)) {
1262                 tid_agg_rx->auto_seq = false;
1263                 tid_agg_rx->ssn = mpdu_seq_num;
1264                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1265         }
1266 
1267         buf_size = tid_agg_rx->buf_size;
1268         head_seq_num = tid_agg_rx->head_seq_num;
1269 
1270         /*
1271          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1272          * be reordered.
1273          */
1274         if (unlikely(!tid_agg_rx->started)) {
1275                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1276                         ret = false;
1277                         goto out;
1278                 }
1279                 tid_agg_rx->started = true;
1280         }
1281 
1282         /* frame with out of date sequence number */
1283         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1284                 dev_kfree_skb(skb);
1285                 goto out;
1286         }
1287 
1288         /*
1289          * If frame the sequence number exceeds our buffering window
1290          * size release some previous frames to make room for this one.
1291          */
1292         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1293                 head_seq_num = ieee80211_sn_inc(
1294                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1295                 /* release stored frames up to new head to stack */
1296                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1297                                                  head_seq_num, frames);
1298         }
1299 
1300         /* Now the new frame is always in the range of the reordering buffer */
1301 
1302         index = mpdu_seq_num % tid_agg_rx->buf_size;
1303 
1304         /* check if we already stored this frame */
1305         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1306                 dev_kfree_skb(skb);
1307                 goto out;
1308         }
1309 
1310         /*
1311          * If the current MPDU is in the right order and nothing else
1312          * is stored we can process it directly, no need to buffer it.
1313          * If it is first but there's something stored, we may be able
1314          * to release frames after this one.
1315          */
1316         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1317             tid_agg_rx->stored_mpdu_num == 0) {
1318                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1319                         tid_agg_rx->head_seq_num =
1320                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1321                 ret = false;
1322                 goto out;
1323         }
1324 
1325         /* put the frame in the reordering buffer */
1326         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1327         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1328                 tid_agg_rx->reorder_time[index] = jiffies;
1329                 tid_agg_rx->stored_mpdu_num++;
1330                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1331         }
1332 
1333  out:
1334         spin_unlock(&tid_agg_rx->reorder_lock);
1335         return ret;
1336 }
1337 
1338 /*
1339  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1340  * true if the MPDU was buffered, false if it should be processed.
1341  */
1342 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1343                                        struct sk_buff_head *frames)
1344 {
1345         struct sk_buff *skb = rx->skb;
1346         struct ieee80211_local *local = rx->local;
1347         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1348         struct sta_info *sta = rx->sta;
1349         struct tid_ampdu_rx *tid_agg_rx;
1350         u16 sc;
1351         u8 tid, ack_policy;
1352 
1353         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1354             is_multicast_ether_addr(hdr->addr1))
1355                 goto dont_reorder;
1356 
1357         /*
1358          * filter the QoS data rx stream according to
1359          * STA/TID and check if this STA/TID is on aggregation
1360          */
1361 
1362         if (!sta)
1363                 goto dont_reorder;
1364 
1365         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1366                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1367         tid = ieee80211_get_tid(hdr);
1368 
1369         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1370         if (!tid_agg_rx) {
1371                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1372                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1373                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1374                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1375                                              WLAN_BACK_RECIPIENT,
1376                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1377                 goto dont_reorder;
1378         }
1379 
1380         /* qos null data frames are excluded */
1381         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1382                 goto dont_reorder;
1383 
1384         /* not part of a BA session */
1385         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1386             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1387                 goto dont_reorder;
1388 
1389         /* new, potentially un-ordered, ampdu frame - process it */
1390 
1391         /* reset session timer */
1392         if (tid_agg_rx->timeout)
1393                 tid_agg_rx->last_rx = jiffies;
1394 
1395         /* if this mpdu is fragmented - terminate rx aggregation session */
1396         sc = le16_to_cpu(hdr->seq_ctrl);
1397         if (sc & IEEE80211_SCTL_FRAG) {
1398                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1399                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1400                 return;
1401         }
1402 
1403         /*
1404          * No locking needed -- we will only ever process one
1405          * RX packet at a time, and thus own tid_agg_rx. All
1406          * other code manipulating it needs to (and does) make
1407          * sure that we cannot get to it any more before doing
1408          * anything with it.
1409          */
1410         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1411                                              frames))
1412                 return;
1413 
1414  dont_reorder:
1415         __skb_queue_tail(frames, skb);
1416 }
1417 
1418 static ieee80211_rx_result debug_noinline
1419 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1420 {
1421         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1422         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1423 
1424         if (status->flag & RX_FLAG_DUP_VALIDATED)
1425                 return RX_CONTINUE;
1426 
1427         /*
1428          * Drop duplicate 802.11 retransmissions
1429          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1430          */
1431 
1432         if (rx->skb->len < 24)
1433                 return RX_CONTINUE;
1434 
1435         if (ieee80211_is_ctl(hdr->frame_control) ||
1436             ieee80211_is_nullfunc(hdr->frame_control) ||
1437             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1438             is_multicast_ether_addr(hdr->addr1))
1439                 return RX_CONTINUE;
1440 
1441         if (!rx->sta)
1442                 return RX_CONTINUE;
1443 
1444         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1445                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1446                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1447                 rx->sta->rx_stats.num_duplicates++;
1448                 return RX_DROP_UNUSABLE;
1449         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1450                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1451         }
1452 
1453         return RX_CONTINUE;
1454 }
1455 
1456 static ieee80211_rx_result debug_noinline
1457 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1458 {
1459         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1460 
1461         /* Drop disallowed frame classes based on STA auth/assoc state;
1462          * IEEE 802.11, Chap 5.5.
1463          *
1464          * mac80211 filters only based on association state, i.e. it drops
1465          * Class 3 frames from not associated stations. hostapd sends
1466          * deauth/disassoc frames when needed. In addition, hostapd is
1467          * responsible for filtering on both auth and assoc states.
1468          */
1469 
1470         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1471                 return ieee80211_rx_mesh_check(rx);
1472 
1473         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1474                       ieee80211_is_pspoll(hdr->frame_control)) &&
1475                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1476                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1477                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1478                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1479                 /*
1480                  * accept port control frames from the AP even when it's not
1481                  * yet marked ASSOC to prevent a race where we don't set the
1482                  * assoc bit quickly enough before it sends the first frame
1483                  */
1484                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1485                     ieee80211_is_data_present(hdr->frame_control)) {
1486                         unsigned int hdrlen;
1487                         __be16 ethertype;
1488 
1489                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1490 
1491                         if (rx->skb->len < hdrlen + 8)
1492                                 return RX_DROP_MONITOR;
1493 
1494                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1495                         if (ethertype == rx->sdata->control_port_protocol)
1496                                 return RX_CONTINUE;
1497                 }
1498 
1499                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1500                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1501                                                hdr->addr2,
1502                                                GFP_ATOMIC))
1503                         return RX_DROP_UNUSABLE;
1504 
1505                 return RX_DROP_MONITOR;
1506         }
1507 
1508         return RX_CONTINUE;
1509 }
1510 
1511 
1512 static ieee80211_rx_result debug_noinline
1513 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1514 {
1515         struct ieee80211_local *local;
1516         struct ieee80211_hdr *hdr;
1517         struct sk_buff *skb;
1518 
1519         local = rx->local;
1520         skb = rx->skb;
1521         hdr = (struct ieee80211_hdr *) skb->data;
1522 
1523         if (!local->pspolling)
1524                 return RX_CONTINUE;
1525 
1526         if (!ieee80211_has_fromds(hdr->frame_control))
1527                 /* this is not from AP */
1528                 return RX_CONTINUE;
1529 
1530         if (!ieee80211_is_data(hdr->frame_control))
1531                 return RX_CONTINUE;
1532 
1533         if (!ieee80211_has_moredata(hdr->frame_control)) {
1534                 /* AP has no more frames buffered for us */
1535                 local->pspolling = false;
1536                 return RX_CONTINUE;
1537         }
1538 
1539         /* more data bit is set, let's request a new frame from the AP */
1540         ieee80211_send_pspoll(local, rx->sdata);
1541 
1542         return RX_CONTINUE;
1543 }
1544 
1545 static void sta_ps_start(struct sta_info *sta)
1546 {
1547         struct ieee80211_sub_if_data *sdata = sta->sdata;
1548         struct ieee80211_local *local = sdata->local;
1549         struct ps_data *ps;
1550         int tid;
1551 
1552         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1553             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1554                 ps = &sdata->bss->ps;
1555         else
1556                 return;
1557 
1558         atomic_inc(&ps->num_sta_ps);
1559         set_sta_flag(sta, WLAN_STA_PS_STA);
1560         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1561                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1562         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1563                sta->sta.addr, sta->sta.aid);
1564 
1565         ieee80211_clear_fast_xmit(sta);
1566 
1567         if (!sta->sta.txq[0])
1568                 return;
1569 
1570         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
1571                 struct ieee80211_txq *txq = sta->sta.txq[tid];
1572                 struct txq_info *txqi = to_txq_info(txq);
1573 
1574                 spin_lock(&local->active_txq_lock[txq->ac]);
1575                 if (!list_empty(&txqi->schedule_order))
1576                         list_del_init(&txqi->schedule_order);
1577                 spin_unlock(&local->active_txq_lock[txq->ac]);
1578 
1579                 if (txq_has_queue(txq))
1580                         set_bit(tid, &sta->txq_buffered_tids);
1581                 else
1582                         clear_bit(tid, &sta->txq_buffered_tids);
1583         }
1584 }
1585 
1586 static void sta_ps_end(struct sta_info *sta)
1587 {
1588         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1589                sta->sta.addr, sta->sta.aid);
1590 
1591         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1592                 /*
1593                  * Clear the flag only if the other one is still set
1594                  * so that the TX path won't start TX'ing new frames
1595                  * directly ... In the case that the driver flag isn't
1596                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1597                  */
1598                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1599                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1600                        sta->sta.addr, sta->sta.aid);
1601                 return;
1602         }
1603 
1604         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1605         clear_sta_flag(sta, WLAN_STA_PS_STA);
1606         ieee80211_sta_ps_deliver_wakeup(sta);
1607 }
1608 
1609 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1610 {
1611         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1612         bool in_ps;
1613 
1614         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1615 
1616         /* Don't let the same PS state be set twice */
1617         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1618         if ((start && in_ps) || (!start && !in_ps))
1619                 return -EINVAL;
1620 
1621         if (start)
1622                 sta_ps_start(sta);
1623         else
1624                 sta_ps_end(sta);
1625 
1626         return 0;
1627 }
1628 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1629 
1630 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1631 {
1632         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1633 
1634         if (test_sta_flag(sta, WLAN_STA_SP))
1635                 return;
1636 
1637         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1638                 ieee80211_sta_ps_deliver_poll_response(sta);
1639         else
1640                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1641 }
1642 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1643 
1644 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1645 {
1646         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1647         int ac = ieee80211_ac_from_tid(tid);
1648 
1649         /*
1650          * If this AC is not trigger-enabled do nothing unless the
1651          * driver is calling us after it already checked.
1652          *
1653          * NB: This could/should check a separate bitmap of trigger-
1654          * enabled queues, but for now we only implement uAPSD w/o
1655          * TSPEC changes to the ACs, so they're always the same.
1656          */
1657         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1658             tid != IEEE80211_NUM_TIDS)
1659                 return;
1660 
1661         /* if we are in a service period, do nothing */
1662         if (test_sta_flag(sta, WLAN_STA_SP))
1663                 return;
1664 
1665         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1666                 ieee80211_sta_ps_deliver_uapsd(sta);
1667         else
1668                 set_sta_flag(sta, WLAN_STA_UAPSD);
1669 }
1670 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1671 
1672 static ieee80211_rx_result debug_noinline
1673 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1674 {
1675         struct ieee80211_sub_if_data *sdata = rx->sdata;
1676         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1677         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1678 
1679         if (!rx->sta)
1680                 return RX_CONTINUE;
1681 
1682         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1683             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1684                 return RX_CONTINUE;
1685 
1686         /*
1687          * The device handles station powersave, so don't do anything about
1688          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1689          * it to mac80211 since they're handled.)
1690          */
1691         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1692                 return RX_CONTINUE;
1693 
1694         /*
1695          * Don't do anything if the station isn't already asleep. In
1696          * the uAPSD case, the station will probably be marked asleep,
1697          * in the PS-Poll case the station must be confused ...
1698          */
1699         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1700                 return RX_CONTINUE;
1701 
1702         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1703                 ieee80211_sta_pspoll(&rx->sta->sta);
1704 
1705                 /* Free PS Poll skb here instead of returning RX_DROP that would
1706                  * count as an dropped frame. */
1707                 dev_kfree_skb(rx->skb);
1708 
1709                 return RX_QUEUED;
1710         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1711                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1712                    ieee80211_has_pm(hdr->frame_control) &&
1713                    (ieee80211_is_data_qos(hdr->frame_control) ||
1714                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1715                 u8 tid = ieee80211_get_tid(hdr);
1716 
1717                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1718         }
1719 
1720         return RX_CONTINUE;
1721 }
1722 
1723 static ieee80211_rx_result debug_noinline
1724 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1725 {
1726         struct sta_info *sta = rx->sta;
1727         struct sk_buff *skb = rx->skb;
1728         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1729         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1730         int i;
1731 
1732         if (!sta)
1733                 return RX_CONTINUE;
1734 
1735         /*
1736          * Update last_rx only for IBSS packets which are for the current
1737          * BSSID and for station already AUTHORIZED to avoid keeping the
1738          * current IBSS network alive in cases where other STAs start
1739          * using different BSSID. This will also give the station another
1740          * chance to restart the authentication/authorization in case
1741          * something went wrong the first time.
1742          */
1743         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1744                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1745                                                 NL80211_IFTYPE_ADHOC);
1746                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1747                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1748                         sta->rx_stats.last_rx = jiffies;
1749                         if (ieee80211_is_data(hdr->frame_control) &&
1750                             !is_multicast_ether_addr(hdr->addr1))
1751                                 sta->rx_stats.last_rate =
1752                                         sta_stats_encode_rate(status);
1753                 }
1754         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1755                 sta->rx_stats.last_rx = jiffies;
1756         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1757                 /*
1758                  * Mesh beacons will update last_rx when if they are found to
1759                  * match the current local configuration when processed.
1760                  */
1761                 sta->rx_stats.last_rx = jiffies;
1762                 if (ieee80211_is_data(hdr->frame_control))
1763                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1764         }
1765 
1766         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1767                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1768 
1769         sta->rx_stats.fragments++;
1770 
1771         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1772         sta->rx_stats.bytes += rx->skb->len;
1773         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1774 
1775         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1776                 sta->rx_stats.last_signal = status->signal;
1777                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1778         }
1779 
1780         if (status->chains) {
1781                 sta->rx_stats.chains = status->chains;
1782                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1783                         int signal = status->chain_signal[i];
1784 
1785                         if (!(status->chains & BIT(i)))
1786                                 continue;
1787 
1788                         sta->rx_stats.chain_signal_last[i] = signal;
1789                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1790                                         -signal);
1791                 }
1792         }
1793 
1794         /*
1795          * Change STA power saving mode only at the end of a frame
1796          * exchange sequence, and only for a data or management
1797          * frame as specified in IEEE 802.11-2016 11.2.3.2
1798          */
1799         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1800             !ieee80211_has_morefrags(hdr->frame_control) &&
1801             !is_multicast_ether_addr(hdr->addr1) &&
1802             (ieee80211_is_mgmt(hdr->frame_control) ||
1803              ieee80211_is_data(hdr->frame_control)) &&
1804             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1805             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1806              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1807                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1808                         if (!ieee80211_has_pm(hdr->frame_control))
1809                                 sta_ps_end(sta);
1810                 } else {
1811                         if (ieee80211_has_pm(hdr->frame_control))
1812                                 sta_ps_start(sta);
1813                 }
1814         }
1815 
1816         /* mesh power save support */
1817         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1818                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1819 
1820         /*
1821          * Drop (qos-)data::nullfunc frames silently, since they
1822          * are used only to control station power saving mode.
1823          */
1824         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1825             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1826                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1827 
1828                 /*
1829                  * If we receive a 4-addr nullfunc frame from a STA
1830                  * that was not moved to a 4-addr STA vlan yet send
1831                  * the event to userspace and for older hostapd drop
1832                  * the frame to the monitor interface.
1833                  */
1834                 if (ieee80211_has_a4(hdr->frame_control) &&
1835                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1836                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1837                       !rx->sdata->u.vlan.sta))) {
1838                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1839                                 cfg80211_rx_unexpected_4addr_frame(
1840                                         rx->sdata->dev, sta->sta.addr,
1841                                         GFP_ATOMIC);
1842                         return RX_DROP_MONITOR;
1843                 }
1844                 /*
1845                  * Update counter and free packet here to avoid
1846                  * counting this as a dropped packed.
1847                  */
1848                 sta->rx_stats.packets++;
1849                 dev_kfree_skb(rx->skb);
1850                 return RX_QUEUED;
1851         }
1852 
1853         return RX_CONTINUE;
1854 } /* ieee80211_rx_h_sta_process */
1855 
1856 static ieee80211_rx_result debug_noinline
1857 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1858 {
1859         struct sk_buff *skb = rx->skb;
1860         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1861         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1862         int keyidx;
1863         int hdrlen;
1864         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1865         struct ieee80211_key *sta_ptk = NULL;
1866         int mmie_keyidx = -1;
1867         __le16 fc;
1868         const struct ieee80211_cipher_scheme *cs = NULL;
1869 
1870         /*
1871          * Key selection 101
1872          *
1873          * There are four types of keys:
1874          *  - GTK (group keys)
1875          *  - IGTK (group keys for management frames)
1876          *  - PTK (pairwise keys)
1877          *  - STK (station-to-station pairwise keys)
1878          *
1879          * When selecting a key, we have to distinguish between multicast
1880          * (including broadcast) and unicast frames, the latter can only
1881          * use PTKs and STKs while the former always use GTKs and IGTKs.
1882          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1883          * unicast frames can also use key indices like GTKs. Hence, if we
1884          * don't have a PTK/STK we check the key index for a WEP key.
1885          *
1886          * Note that in a regular BSS, multicast frames are sent by the
1887          * AP only, associated stations unicast the frame to the AP first
1888          * which then multicasts it on their behalf.
1889          *
1890          * There is also a slight problem in IBSS mode: GTKs are negotiated
1891          * with each station, that is something we don't currently handle.
1892          * The spec seems to expect that one negotiates the same key with
1893          * every station but there's no such requirement; VLANs could be
1894          * possible.
1895          */
1896 
1897         /* start without a key */
1898         rx->key = NULL;
1899         fc = hdr->frame_control;
1900 
1901         if (rx->sta) {
1902                 int keyid = rx->sta->ptk_idx;
1903 
1904                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1905                         cs = rx->sta->cipher_scheme;
1906                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1907                         if (unlikely(keyid < 0))
1908                                 return RX_DROP_UNUSABLE;
1909                 }
1910                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1911         }
1912 
1913         if (!ieee80211_has_protected(fc))
1914                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1915 
1916         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1917                 rx->key = sta_ptk;
1918                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1919                     (status->flag & RX_FLAG_IV_STRIPPED))
1920                         return RX_CONTINUE;
1921                 /* Skip decryption if the frame is not protected. */
1922                 if (!ieee80211_has_protected(fc))
1923                         return RX_CONTINUE;
1924         } else if (mmie_keyidx >= 0) {
1925                 /* Broadcast/multicast robust management frame / BIP */
1926                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1927                     (status->flag & RX_FLAG_IV_STRIPPED))
1928                         return RX_CONTINUE;
1929 
1930                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1931                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1932                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1933                 if (rx->sta) {
1934                         if (ieee80211_is_group_privacy_action(skb) &&
1935                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1936                                 return RX_DROP_MONITOR;
1937 
1938                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1939                 }
1940                 if (!rx->key)
1941                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1942         } else if (!ieee80211_has_protected(fc)) {
1943                 /*
1944                  * The frame was not protected, so skip decryption. However, we
1945                  * need to set rx->key if there is a key that could have been
1946                  * used so that the frame may be dropped if encryption would
1947                  * have been expected.
1948                  */
1949                 struct ieee80211_key *key = NULL;
1950                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1951                 int i;
1952 
1953                 if (ieee80211_is_mgmt(fc) &&
1954                     is_multicast_ether_addr(hdr->addr1) &&
1955                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1956                         rx->key = key;
1957                 else {
1958                         if (rx->sta) {
1959                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1960                                         key = rcu_dereference(rx->sta->gtk[i]);
1961                                         if (key)
1962                                                 break;
1963                                 }
1964                         }
1965                         if (!key) {
1966                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1967                                         key = rcu_dereference(sdata->keys[i]);
1968                                         if (key)
1969                                                 break;
1970                                 }
1971                         }
1972                         if (key)
1973                                 rx->key = key;
1974                 }
1975                 return RX_CONTINUE;
1976         } else {
1977                 u8 keyid;
1978 
1979                 /*
1980                  * The device doesn't give us the IV so we won't be
1981                  * able to look up the key. That's ok though, we
1982                  * don't need to decrypt the frame, we just won't
1983                  * be able to keep statistics accurate.
1984                  * Except for key threshold notifications, should
1985                  * we somehow allow the driver to tell us which key
1986                  * the hardware used if this flag is set?
1987                  */
1988                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1989                     (status->flag & RX_FLAG_IV_STRIPPED))
1990                         return RX_CONTINUE;
1991 
1992                 hdrlen = ieee80211_hdrlen(fc);
1993 
1994                 if (cs) {
1995                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1996 
1997                         if (unlikely(keyidx < 0))
1998                                 return RX_DROP_UNUSABLE;
1999                 } else {
2000                         if (rx->skb->len < 8 + hdrlen)
2001                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
2002                         /*
2003                          * no need to call ieee80211_wep_get_keyidx,
2004                          * it verifies a bunch of things we've done already
2005                          */
2006                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
2007                         keyidx = keyid >> 6;
2008                 }
2009 
2010                 /* check per-station GTK first, if multicast packet */
2011                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2012                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2013 
2014                 /* if not found, try default key */
2015                 if (!rx->key) {
2016                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2017 
2018                         /*
2019                          * RSNA-protected unicast frames should always be
2020                          * sent with pairwise or station-to-station keys,
2021                          * but for WEP we allow using a key index as well.
2022                          */
2023                         if (rx->key &&
2024                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2025                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2026                             !is_multicast_ether_addr(hdr->addr1))
2027                                 rx->key = NULL;
2028                 }
2029         }
2030 
2031         if (rx->key) {
2032                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2033                         return RX_DROP_MONITOR;
2034 
2035                 /* TODO: add threshold stuff again */
2036         } else {
2037                 return RX_DROP_MONITOR;
2038         }
2039 
2040         switch (rx->key->conf.cipher) {
2041         case WLAN_CIPHER_SUITE_WEP40:
2042         case WLAN_CIPHER_SUITE_WEP104:
2043                 result = ieee80211_crypto_wep_decrypt(rx);
2044                 break;
2045         case WLAN_CIPHER_SUITE_TKIP:
2046                 result = ieee80211_crypto_tkip_decrypt(rx);
2047                 break;
2048         case WLAN_CIPHER_SUITE_CCMP:
2049                 result = ieee80211_crypto_ccmp_decrypt(
2050                         rx, IEEE80211_CCMP_MIC_LEN);
2051                 break;
2052         case WLAN_CIPHER_SUITE_CCMP_256:
2053                 result = ieee80211_crypto_ccmp_decrypt(
2054                         rx, IEEE80211_CCMP_256_MIC_LEN);
2055                 break;
2056         case WLAN_CIPHER_SUITE_AES_CMAC:
2057                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2058                 break;
2059         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2060                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2061                 break;
2062         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2063         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2064                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2065                 break;
2066         case WLAN_CIPHER_SUITE_GCMP:
2067         case WLAN_CIPHER_SUITE_GCMP_256:
2068                 result = ieee80211_crypto_gcmp_decrypt(rx);
2069                 break;
2070         default:
2071                 result = ieee80211_crypto_hw_decrypt(rx);
2072         }
2073 
2074         /* the hdr variable is invalid after the decrypt handlers */
2075 
2076         /* either the frame has been decrypted or will be dropped */
2077         status->flag |= RX_FLAG_DECRYPTED;
2078 
2079         return result;
2080 }
2081 
2082 static inline struct ieee80211_fragment_entry *
2083 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2084                          unsigned int frag, unsigned int seq, int rx_queue,
2085                          struct sk_buff **skb)
2086 {
2087         struct ieee80211_fragment_entry *entry;
2088 
2089         entry = &sdata->fragments[sdata->fragment_next++];
2090         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2091                 sdata->fragment_next = 0;
2092 
2093         if (!skb_queue_empty(&entry->skb_list))
2094                 __skb_queue_purge(&entry->skb_list);
2095 
2096         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2097         *skb = NULL;
2098         entry->first_frag_time = jiffies;
2099         entry->seq = seq;
2100         entry->rx_queue = rx_queue;
2101         entry->last_frag = frag;
2102         entry->check_sequential_pn = false;
2103         entry->extra_len = 0;
2104 
2105         return entry;
2106 }
2107 
2108 static inline struct ieee80211_fragment_entry *
2109 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2110                           unsigned int frag, unsigned int seq,
2111                           int rx_queue, struct ieee80211_hdr *hdr)
2112 {
2113         struct ieee80211_fragment_entry *entry;
2114         int i, idx;
2115 
2116         idx = sdata->fragment_next;
2117         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2118                 struct ieee80211_hdr *f_hdr;
2119                 struct sk_buff *f_skb;
2120 
2121                 idx--;
2122                 if (idx < 0)
2123                         idx = IEEE80211_FRAGMENT_MAX - 1;
2124 
2125                 entry = &sdata->fragments[idx];
2126                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2127                     entry->rx_queue != rx_queue ||
2128                     entry->last_frag + 1 != frag)
2129                         continue;
2130 
2131                 f_skb = __skb_peek(&entry->skb_list);
2132                 f_hdr = (struct ieee80211_hdr *) f_skb->data;
2133 
2134                 /*
2135                  * Check ftype and addresses are equal, else check next fragment
2136                  */
2137                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2138                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2139                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2140                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2141                         continue;
2142 
2143                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2144                         __skb_queue_purge(&entry->skb_list);
2145                         continue;
2146                 }
2147                 return entry;
2148         }
2149 
2150         return NULL;
2151 }
2152 
2153 static ieee80211_rx_result debug_noinline
2154 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2155 {
2156         struct ieee80211_hdr *hdr;
2157         u16 sc;
2158         __le16 fc;
2159         unsigned int frag, seq;
2160         struct ieee80211_fragment_entry *entry;
2161         struct sk_buff *skb;
2162 
2163         hdr = (struct ieee80211_hdr *)rx->skb->data;
2164         fc = hdr->frame_control;
2165 
2166         if (ieee80211_is_ctl(fc))
2167                 return RX_CONTINUE;
2168 
2169         sc = le16_to_cpu(hdr->seq_ctrl);
2170         frag = sc & IEEE80211_SCTL_FRAG;
2171 
2172         if (is_multicast_ether_addr(hdr->addr1)) {
2173                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2174                 goto out_no_led;
2175         }
2176 
2177         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2178                 goto out;
2179 
2180         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2181 
2182         if (skb_linearize(rx->skb))
2183                 return RX_DROP_UNUSABLE;
2184 
2185         /*
2186          *  skb_linearize() might change the skb->data and
2187          *  previously cached variables (in this case, hdr) need to
2188          *  be refreshed with the new data.
2189          */
2190         hdr = (struct ieee80211_hdr *)rx->skb->data;
2191         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2192 
2193         if (frag == 0) {
2194                 /* This is the first fragment of a new frame. */
2195                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2196                                                  rx->seqno_idx, &(rx->skb));
2197                 if (rx->key &&
2198                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2199                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2200                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2201                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2202                     ieee80211_has_protected(fc)) {
2203                         int queue = rx->security_idx;
2204 
2205                         /* Store CCMP/GCMP PN so that we can verify that the
2206                          * next fragment has a sequential PN value.
2207                          */
2208                         entry->check_sequential_pn = true;
2209                         memcpy(entry->last_pn,
2210                                rx->key->u.ccmp.rx_pn[queue],
2211                                IEEE80211_CCMP_PN_LEN);
2212                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2213                                               u.ccmp.rx_pn) !=
2214                                      offsetof(struct ieee80211_key,
2215                                               u.gcmp.rx_pn));
2216                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2217                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2218                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2219                                      IEEE80211_GCMP_PN_LEN);
2220                 }
2221                 return RX_QUEUED;
2222         }
2223 
2224         /* This is a fragment for a frame that should already be pending in
2225          * fragment cache. Add this fragment to the end of the pending entry.
2226          */
2227         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2228                                           rx->seqno_idx, hdr);
2229         if (!entry) {
2230                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2231                 return RX_DROP_MONITOR;
2232         }
2233 
2234         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2235          *  MPDU PN values are not incrementing in steps of 1."
2236          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2237          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2238          */
2239         if (entry->check_sequential_pn) {
2240                 int i;
2241                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2242                 int queue;
2243 
2244                 if (!rx->key ||
2245                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2246                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2247                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2248                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2249                         return RX_DROP_UNUSABLE;
2250                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2251                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2252                         pn[i]++;
2253                         if (pn[i])
2254                                 break;
2255                 }
2256                 queue = rx->security_idx;
2257                 rpn = rx->key->u.ccmp.rx_pn[queue];
2258                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2259                         return RX_DROP_UNUSABLE;
2260                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2261         }
2262 
2263         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2264         __skb_queue_tail(&entry->skb_list, rx->skb);
2265         entry->last_frag = frag;
2266         entry->extra_len += rx->skb->len;
2267         if (ieee80211_has_morefrags(fc)) {
2268                 rx->skb = NULL;
2269                 return RX_QUEUED;
2270         }
2271 
2272         rx->skb = __skb_dequeue(&entry->skb_list);
2273         if (skb_tailroom(rx->skb) < entry->extra_len) {
2274                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2275                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2276                                               GFP_ATOMIC))) {
2277                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2278                         __skb_queue_purge(&entry->skb_list);
2279                         return RX_DROP_UNUSABLE;
2280                 }
2281         }
2282         while ((skb = __skb_dequeue(&entry->skb_list))) {
2283                 skb_put_data(rx->skb, skb->data, skb->len);
2284                 dev_kfree_skb(skb);
2285         }
2286 
2287  out:
2288         ieee80211_led_rx(rx->local);
2289  out_no_led:
2290         if (rx->sta)
2291                 rx->sta->rx_stats.packets++;
2292         return RX_CONTINUE;
2293 }
2294 
2295 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2296 {
2297         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2298                 return -EACCES;
2299 
2300         return 0;
2301 }
2302 
2303 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2304 {
2305         struct sk_buff *skb = rx->skb;
2306         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2307 
2308         /*
2309          * Pass through unencrypted frames if the hardware has
2310          * decrypted them already.
2311          */
2312         if (status->flag & RX_FLAG_DECRYPTED)
2313                 return 0;
2314 
2315         /* Drop unencrypted frames if key is set. */
2316         if (unlikely(!ieee80211_has_protected(fc) &&
2317                      !ieee80211_is_nullfunc(fc) &&
2318                      ieee80211_is_data(fc) && rx->key))
2319                 return -EACCES;
2320 
2321         return 0;
2322 }
2323 
2324 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2325 {
2326         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2327         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2328         __le16 fc = hdr->frame_control;
2329 
2330         /*
2331          * Pass through unencrypted frames if the hardware has
2332          * decrypted them already.
2333          */
2334         if (status->flag & RX_FLAG_DECRYPTED)
2335                 return 0;
2336 
2337         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2338                 if (unlikely(!ieee80211_has_protected(fc) &&
2339                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2340                              rx->key)) {
2341                         if (ieee80211_is_deauth(fc) ||
2342                             ieee80211_is_disassoc(fc))
2343                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2344                                                              rx->skb->data,
2345                                                              rx->skb->len);
2346                         return -EACCES;
2347                 }
2348                 /* BIP does not use Protected field, so need to check MMIE */
2349                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2350                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2351                         if (ieee80211_is_deauth(fc) ||
2352                             ieee80211_is_disassoc(fc))
2353                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2354                                                              rx->skb->data,
2355                                                              rx->skb->len);
2356                         return -EACCES;
2357                 }
2358                 /*
2359                  * When using MFP, Action frames are not allowed prior to
2360                  * having configured keys.
2361                  */
2362                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2363                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2364                         return -EACCES;
2365         }
2366 
2367         return 0;
2368 }
2369 
2370 static int
2371 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2372 {
2373         struct ieee80211_sub_if_data *sdata = rx->sdata;
2374         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2375         bool check_port_control = false;
2376         struct ethhdr *ehdr;
2377         int ret;
2378 
2379         *port_control = false;
2380         if (ieee80211_has_a4(hdr->frame_control) &&
2381             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2382                 return -1;
2383 
2384         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2385             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2386 
2387                 if (!sdata->u.mgd.use_4addr)
2388                         return -1;
2389                 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
2390                         check_port_control = true;
2391         }
2392 
2393         if (is_multicast_ether_addr(hdr->addr1) &&
2394             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2395                 return -1;
2396 
2397         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2398         if (ret < 0)
2399                 return ret;
2400 
2401         ehdr = (struct ethhdr *) rx->skb->data;
2402         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2403                 *port_control = true;
2404         else if (check_port_control)
2405                 return -1;
2406 
2407         return 0;
2408 }
2409 
2410 /*
2411  * requires that rx->skb is a frame with ethernet header
2412  */
2413 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2414 {
2415         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2416                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2417         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2418 
2419         /*
2420          * Allow EAPOL frames to us/the PAE group address regardless
2421          * of whether the frame was encrypted or not.
2422          */
2423         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2424             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2425              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2426                 return true;
2427 
2428         if (ieee80211_802_1x_port_control(rx) ||
2429             ieee80211_drop_unencrypted(rx, fc))
2430                 return false;
2431 
2432         return true;
2433 }
2434 
2435 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2436                                                  struct ieee80211_rx_data *rx)
2437 {
2438         struct ieee80211_sub_if_data *sdata = rx->sdata;
2439         struct net_device *dev = sdata->dev;
2440 
2441         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2442                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2443                      sdata->control_port_over_nl80211)) {
2444                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2445                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2446 
2447                 cfg80211_rx_control_port(dev, skb, noencrypt);
2448                 dev_kfree_skb(skb);
2449         } else {
2450                 /* deliver to local stack */
2451                 if (rx->napi)
2452                         napi_gro_receive(rx->napi, skb);
2453                 else
2454                         netif_receive_skb(skb);
2455         }
2456 }
2457 
2458 /*
2459  * requires that rx->skb is a frame with ethernet header
2460  */
2461 static void
2462 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2463 {
2464         struct ieee80211_sub_if_data *sdata = rx->sdata;
2465         struct net_device *dev = sdata->dev;
2466         struct sk_buff *skb, *xmit_skb;
2467         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2468         struct sta_info *dsta;
2469 
2470         skb = rx->skb;
2471         xmit_skb = NULL;
2472 
2473         ieee80211_rx_stats(dev, skb->len);
2474 
2475         if (rx->sta) {
2476                 /* The seqno index has the same property as needed
2477                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2478                  * for non-QoS-data frames. Here we know it's a data
2479                  * frame, so count MSDUs.
2480                  */
2481                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2482                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2483                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2484         }
2485 
2486         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2487              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2488             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2489             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2490                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2491                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2492                         /*
2493                          * send multicast frames both to higher layers in
2494                          * local net stack and back to the wireless medium
2495                          */
2496                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2497                         if (!xmit_skb)
2498                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2499                                                     dev->name);
2500                 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2501                            !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2502                         dsta = sta_info_get(sdata, ehdr->h_dest);
2503                         if (dsta) {
2504                                 /*
2505                                  * The destination station is associated to
2506                                  * this AP (in this VLAN), so send the frame
2507                                  * directly to it and do not pass it to local
2508                                  * net stack.
2509                                  */
2510                                 xmit_skb = skb;
2511                                 skb = NULL;
2512                         }
2513                 }
2514         }
2515 
2516 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2517         if (skb) {
2518                 /* 'align' will only take the values 0 or 2 here since all
2519                  * frames are required to be aligned to 2-byte boundaries
2520                  * when being passed to mac80211; the code here works just
2521                  * as well if that isn't true, but mac80211 assumes it can
2522                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2523                  */
2524                 int align;
2525 
2526                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2527                 if (align) {
2528                         if (WARN_ON(skb_headroom(skb) < 3)) {
2529                                 dev_kfree_skb(skb);
2530                                 skb = NULL;
2531                         } else {
2532                                 u8 *data = skb->data;
2533                                 size_t len = skb_headlen(skb);
2534                                 skb->data -= align;
2535                                 memmove(skb->data, data, len);
2536                                 skb_set_tail_pointer(skb, len);
2537                         }
2538                 }
2539         }
2540 #endif
2541 
2542         if (skb) {
2543                 skb->protocol = eth_type_trans(skb, dev);
2544                 memset(skb->cb, 0, sizeof(skb->cb));
2545 
2546                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2547         }
2548 
2549         if (xmit_skb) {
2550                 /*
2551                  * Send to wireless media and increase priority by 256 to
2552                  * keep the received priority instead of reclassifying
2553                  * the frame (see cfg80211_classify8021d).
2554                  */
2555                 xmit_skb->priority += 256;
2556                 xmit_skb->protocol = htons(ETH_P_802_3);
2557                 skb_reset_network_header(xmit_skb);
2558                 skb_reset_mac_header(xmit_skb);
2559                 dev_queue_xmit(xmit_skb);
2560         }
2561 }
2562 
2563 static ieee80211_rx_result debug_noinline
2564 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2565 {
2566         struct net_device *dev = rx->sdata->dev;
2567         struct sk_buff *skb = rx->skb;
2568         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2569         __le16 fc = hdr->frame_control;
2570         struct sk_buff_head frame_list;
2571         struct ethhdr ethhdr;
2572         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2573 
2574         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2575                 check_da = NULL;
2576                 check_sa = NULL;
2577         } else switch (rx->sdata->vif.type) {
2578                 case NL80211_IFTYPE_AP:
2579                 case NL80211_IFTYPE_AP_VLAN:
2580                         check_da = NULL;
2581                         break;
2582                 case NL80211_IFTYPE_STATION:
2583                         if (!rx->sta ||
2584                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2585                                 check_sa = NULL;
2586                         break;
2587                 case NL80211_IFTYPE_MESH_POINT:
2588                         check_sa = NULL;
2589                         break;
2590                 default:
2591                         break;
2592         }
2593 
2594         skb->dev = dev;
2595         __skb_queue_head_init(&frame_list);
2596 
2597         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2598                                           rx->sdata->vif.addr,
2599                                           rx->sdata->vif.type,
2600                                           data_offset))
2601                 return RX_DROP_UNUSABLE;
2602 
2603         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2604                                  rx->sdata->vif.type,
2605                                  rx->local->hw.extra_tx_headroom,
2606                                  check_da, check_sa);
2607 
2608         while (!skb_queue_empty(&frame_list)) {
2609                 rx->skb = __skb_dequeue(&frame_list);
2610 
2611                 if (!ieee80211_frame_allowed(rx, fc)) {
2612                         dev_kfree_skb(rx->skb);
2613                         continue;
2614                 }
2615 
2616                 ieee80211_deliver_skb(rx);
2617         }
2618 
2619         return RX_QUEUED;
2620 }
2621 
2622 static ieee80211_rx_result debug_noinline
2623 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2624 {
2625         struct sk_buff *skb = rx->skb;
2626         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2627         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2628         __le16 fc = hdr->frame_control;
2629 
2630         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2631                 return RX_CONTINUE;
2632 
2633         if (unlikely(!ieee80211_is_data(fc)))
2634                 return RX_CONTINUE;
2635 
2636         if (unlikely(!ieee80211_is_data_present(fc)))
2637                 return RX_DROP_MONITOR;
2638 
2639         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2640                 switch (rx->sdata->vif.type) {
2641                 case NL80211_IFTYPE_AP_VLAN:
2642                         if (!rx->sdata->u.vlan.sta)
2643                                 return RX_DROP_UNUSABLE;
2644                         break;
2645                 case NL80211_IFTYPE_STATION:
2646                         if (!rx->sdata->u.mgd.use_4addr)
2647                                 return RX_DROP_UNUSABLE;
2648                         break;
2649                 default:
2650                         return RX_DROP_UNUSABLE;
2651                 }
2652         }
2653 
2654         if (is_multicast_ether_addr(hdr->addr1))
2655                 return RX_DROP_UNUSABLE;
2656 
2657         return __ieee80211_rx_h_amsdu(rx, 0);
2658 }
2659 
2660 #ifdef CONFIG_MAC80211_MESH
2661 static ieee80211_rx_result
2662 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2663 {
2664         struct ieee80211_hdr *fwd_hdr, *hdr;
2665         struct ieee80211_tx_info *info;
2666         struct ieee80211s_hdr *mesh_hdr;
2667         struct sk_buff *skb = rx->skb, *fwd_skb;
2668         struct ieee80211_local *local = rx->local;
2669         struct ieee80211_sub_if_data *sdata = rx->sdata;
2670         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2671         u16 ac, q, hdrlen;
2672         int tailroom = 0;
2673 
2674         hdr = (struct ieee80211_hdr *) skb->data;
2675         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2676 
2677         /* make sure fixed part of mesh header is there, also checks skb len */
2678         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2679                 return RX_DROP_MONITOR;
2680 
2681         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2682 
2683         /* make sure full mesh header is there, also checks skb len */
2684         if (!pskb_may_pull(rx->skb,
2685                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2686                 return RX_DROP_MONITOR;
2687 
2688         /* reload pointers */
2689         hdr = (struct ieee80211_hdr *) skb->data;
2690         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2691 
2692         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2693                 return RX_DROP_MONITOR;
2694 
2695         /* frame is in RMC, don't forward */
2696         if (ieee80211_is_data(hdr->frame_control) &&
2697             is_multicast_ether_addr(hdr->addr1) &&
2698             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2699                 return RX_DROP_MONITOR;
2700 
2701         if (!ieee80211_is_data(hdr->frame_control))
2702                 return RX_CONTINUE;
2703 
2704         if (!mesh_hdr->ttl)
2705                 return RX_DROP_MONITOR;
2706 
2707         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2708                 struct mesh_path *mppath;
2709                 char *proxied_addr;
2710                 char *mpp_addr;
2711 
2712                 if (is_multicast_ether_addr(hdr->addr1)) {
2713                         mpp_addr = hdr->addr3;
2714                         proxied_addr = mesh_hdr->eaddr1;
2715                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2716                             MESH_FLAGS_AE_A5_A6) {
2717                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2718                         mpp_addr = hdr->addr4;
2719                         proxied_addr = mesh_hdr->eaddr2;
2720                 } else {
2721                         return RX_DROP_MONITOR;
2722                 }
2723 
2724                 rcu_read_lock();
2725                 mppath = mpp_path_lookup(sdata, proxied_addr);
2726                 if (!mppath) {
2727                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2728                 } else {
2729                         spin_lock_bh(&mppath->state_lock);
2730                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2731                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2732                         mppath->exp_time = jiffies;
2733                         spin_unlock_bh(&mppath->state_lock);
2734                 }
2735                 rcu_read_unlock();
2736         }
2737 
2738         /* Frame has reached destination.  Don't forward */
2739         if (!is_multicast_ether_addr(hdr->addr1) &&
2740             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2741                 return RX_CONTINUE;
2742 
2743         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2744         q = sdata->vif.hw_queue[ac];
2745         if (ieee80211_queue_stopped(&local->hw, q)) {
2746                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2747                 return RX_DROP_MONITOR;
2748         }
2749         skb_set_queue_mapping(skb, q);
2750 
2751         if (!--mesh_hdr->ttl) {
2752                 if (!is_multicast_ether_addr(hdr->addr1))
2753                         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2754                                                      dropped_frames_ttl);
2755                 goto out;
2756         }
2757 
2758         if (!ifmsh->mshcfg.dot11MeshForwarding)
2759                 goto out;
2760 
2761         if (sdata->crypto_tx_tailroom_needed_cnt)
2762                 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2763 
2764         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2765                                        sdata->encrypt_headroom,
2766                                   tailroom, GFP_ATOMIC);
2767         if (!fwd_skb)
2768                 goto out;
2769 
2770         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2771         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2772         info = IEEE80211_SKB_CB(fwd_skb);
2773         memset(info, 0, sizeof(*info));
2774         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2775         info->control.vif = &rx->sdata->vif;
2776         info->control.jiffies = jiffies;
2777         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2778                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2779                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2780                 /* update power mode indication when forwarding */
2781                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2782         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2783                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2784                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2785         } else {
2786                 /* unable to resolve next hop */
2787                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2788                                    fwd_hdr->addr3, 0,
2789                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2790                                    fwd_hdr->addr2);
2791                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2792                 kfree_skb(fwd_skb);
2793                 return RX_DROP_MONITOR;
2794         }
2795 
2796         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2797         ieee80211_add_pending_skb(local, fwd_skb);
2798  out:
2799         if (is_multicast_ether_addr(hdr->addr1))
2800                 return RX_CONTINUE;
2801         return RX_DROP_MONITOR;
2802 }
2803 #endif
2804 
2805 static ieee80211_rx_result debug_noinline
2806 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2807 {
2808         struct ieee80211_sub_if_data *sdata = rx->sdata;
2809         struct ieee80211_local *local = rx->local;
2810         struct net_device *dev = sdata->dev;
2811         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2812         __le16 fc = hdr->frame_control;
2813         bool port_control;
2814         int err;
2815 
2816         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2817                 return RX_CONTINUE;
2818 
2819         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2820                 return RX_DROP_MONITOR;
2821 
2822         /*
2823          * Send unexpected-4addr-frame event to hostapd. For older versions,
2824          * also drop the frame to cooked monitor interfaces.
2825          */
2826         if (ieee80211_has_a4(hdr->frame_control) &&
2827             sdata->vif.type == NL80211_IFTYPE_AP) {
2828                 if (rx->sta &&
2829                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2830                         cfg80211_rx_unexpected_4addr_frame(
2831                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2832                 return RX_DROP_MONITOR;
2833         }
2834 
2835         err = __ieee80211_data_to_8023(rx, &port_control);
2836         if (unlikely(err))
2837                 return RX_DROP_UNUSABLE;
2838 
2839         if (!ieee80211_frame_allowed(rx, fc))
2840                 return RX_DROP_MONITOR;
2841 
2842         /* directly handle TDLS channel switch requests/responses */
2843         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2844                                                 cpu_to_be16(ETH_P_TDLS))) {
2845                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2846 
2847                 if (pskb_may_pull(rx->skb,
2848                                   offsetof(struct ieee80211_tdls_data, u)) &&
2849                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2850                     tf->category == WLAN_CATEGORY_TDLS &&
2851                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2852                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2853                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2854                         schedule_work(&local->tdls_chsw_work);
2855                         if (rx->sta)
2856                                 rx->sta->rx_stats.packets++;
2857 
2858                         return RX_QUEUED;
2859                 }
2860         }
2861 
2862         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2863             unlikely(port_control) && sdata->bss) {
2864                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2865                                      u.ap);
2866                 dev = sdata->dev;
2867                 rx->sdata = sdata;
2868         }
2869 
2870         rx->skb->dev = dev;
2871 
2872         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2873             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2874             !is_multicast_ether_addr(
2875                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2876             (!local->scanning &&
2877              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2878                 mod_timer(&local->dynamic_ps_timer, jiffies +
2879                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2880 
2881         ieee80211_deliver_skb(rx);
2882 
2883         return RX_QUEUED;
2884 }
2885 
2886 static ieee80211_rx_result debug_noinline
2887 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2888 {
2889         struct sk_buff *skb = rx->skb;
2890         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2891         struct tid_ampdu_rx *tid_agg_rx;
2892         u16 start_seq_num;
2893         u16 tid;
2894 
2895         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2896                 return RX_CONTINUE;
2897 
2898         if (ieee80211_is_back_req(bar->frame_control)) {
2899                 struct {
2900                         __le16 control, start_seq_num;
2901                 } __packed bar_data;
2902                 struct ieee80211_event event = {
2903                         .type = BAR_RX_EVENT,
2904                 };
2905 
2906                 if (!rx->sta)
2907                         return RX_DROP_MONITOR;
2908 
2909                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2910                                   &bar_data, sizeof(bar_data)))
2911                         return RX_DROP_MONITOR;
2912 
2913                 tid = le16_to_cpu(bar_data.control) >> 12;
2914 
2915                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2916                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2917                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2918                                              WLAN_BACK_RECIPIENT,
2919                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2920 
2921                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2922                 if (!tid_agg_rx)
2923                         return RX_DROP_MONITOR;
2924 
2925                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2926                 event.u.ba.tid = tid;
2927                 event.u.ba.ssn = start_seq_num;
2928                 event.u.ba.sta = &rx->sta->sta;
2929 
2930                 /* reset session timer */
2931                 if (tid_agg_rx->timeout)
2932                         mod_timer(&tid_agg_rx->session_timer,
2933                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2934 
2935                 spin_lock(&tid_agg_rx->reorder_lock);
2936                 /* release stored frames up to start of BAR */
2937                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2938                                                  start_seq_num, frames);
2939                 spin_unlock(&tid_agg_rx->reorder_lock);
2940 
2941                 drv_event_callback(rx->local, rx->sdata, &event);
2942 
2943                 kfree_skb(skb);
2944                 return RX_QUEUED;
2945         }
2946 
2947         /*
2948          * After this point, we only want management frames,
2949          * so we can drop all remaining control frames to
2950          * cooked monitor interfaces.
2951          */
2952         return RX_DROP_MONITOR;
2953 }
2954 
2955 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2956                                            struct ieee80211_mgmt *mgmt,
2957                                            size_t len)
2958 {
2959         struct ieee80211_local *local = sdata->local;
2960         struct sk_buff *skb;
2961         struct ieee80211_mgmt *resp;
2962 
2963         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2964                 /* Not to own unicast address */
2965                 return;
2966         }
2967 
2968         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2969             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2970                 /* Not from the current AP or not associated yet. */
2971                 return;
2972         }
2973 
2974         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2975                 /* Too short SA Query request frame */
2976                 return;
2977         }
2978 
2979         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2980         if (skb == NULL)
2981                 return;
2982 
2983         skb_reserve(skb, local->hw.extra_tx_headroom);
2984         resp = skb_put_zero(skb, 24);
2985         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2986         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2987         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2988         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2989                                           IEEE80211_STYPE_ACTION);
2990         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2991         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2992         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2993         memcpy(resp->u.action.u.sa_query.trans_id,
2994                mgmt->u.action.u.sa_query.trans_id,
2995                WLAN_SA_QUERY_TR_ID_LEN);
2996 
2997         ieee80211_tx_skb(sdata, skb);
2998 }
2999 
3000 static ieee80211_rx_result debug_noinline
3001 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3002 {
3003         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3004         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3005 
3006         /*
3007          * From here on, look only at management frames.
3008          * Data and control frames are already handled,
3009          * and unknown (reserved) frames are useless.
3010          */
3011         if (rx->skb->len < 24)
3012                 return RX_DROP_MONITOR;
3013 
3014         if (!ieee80211_is_mgmt(mgmt->frame_control))
3015                 return RX_DROP_MONITOR;
3016 
3017         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3018             ieee80211_is_beacon(mgmt->frame_control) &&
3019             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
3020                 int sig = 0;
3021 
3022                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3023                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3024                         sig = status->signal;
3025 
3026                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3027                                             rx->skb->data, rx->skb->len,
3028                                             status->freq, sig);
3029                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3030         }
3031 
3032         if (ieee80211_drop_unencrypted_mgmt(rx))
3033                 return RX_DROP_UNUSABLE;
3034 
3035         return RX_CONTINUE;
3036 }
3037 
3038 static ieee80211_rx_result debug_noinline
3039 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3040 {
3041         struct ieee80211_local *local = rx->local;
3042         struct ieee80211_sub_if_data *sdata = rx->sdata;
3043         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3044         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3045         int len = rx->skb->len;
3046 
3047         if (!ieee80211_is_action(mgmt->frame_control))
3048                 return RX_CONTINUE;
3049 
3050         /* drop too small frames */
3051         if (len < IEEE80211_MIN_ACTION_SIZE)
3052                 return RX_DROP_UNUSABLE;
3053 
3054         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
3055             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3056             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
3057                 return RX_DROP_UNUSABLE;
3058 
3059         switch (mgmt->u.action.category) {
3060         case WLAN_CATEGORY_HT:
3061                 /* reject HT action frames from stations not supporting HT */
3062                 if (!rx->sta->sta.ht_cap.ht_supported)
3063                         goto invalid;
3064 
3065                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3066                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3067                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3068                     sdata->vif.type != NL80211_IFTYPE_AP &&
3069                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3070                         break;
3071 
3072                 /* verify action & smps_control/chanwidth are present */
3073                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3074                         goto invalid;
3075 
3076                 switch (mgmt->u.action.u.ht_smps.action) {
3077                 case WLAN_HT_ACTION_SMPS: {
3078                         struct ieee80211_supported_band *sband;
3079                         enum ieee80211_smps_mode smps_mode;
3080                         struct sta_opmode_info sta_opmode = {};
3081 
3082                         /* convert to HT capability */
3083                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3084                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3085                                 smps_mode = IEEE80211_SMPS_OFF;
3086                                 break;
3087                         case WLAN_HT_SMPS_CONTROL_STATIC:
3088                                 smps_mode = IEEE80211_SMPS_STATIC;
3089                                 break;
3090                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3091                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3092                                 break;
3093                         default:
3094                                 goto invalid;
3095                         }
3096 
3097                         /* if no change do nothing */
3098                         if (rx->sta->sta.smps_mode == smps_mode)
3099                                 goto handled;
3100                         rx->sta->sta.smps_mode = smps_mode;
3101                         sta_opmode.smps_mode =
3102                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3103                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3104 
3105                         sband = rx->local->hw.wiphy->bands[status->band];
3106 
3107                         rate_control_rate_update(local, sband, rx->sta,
3108                                                  IEEE80211_RC_SMPS_CHANGED);
3109                         cfg80211_sta_opmode_change_notify(sdata->dev,
3110                                                           rx->sta->addr,
3111                                                           &sta_opmode,
3112                                                           GFP_ATOMIC);
3113                         goto handled;
3114                 }
3115                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3116                         struct ieee80211_supported_band *sband;
3117                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3118                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3119                         struct sta_opmode_info sta_opmode = {};
3120 
3121                         /* If it doesn't support 40 MHz it can't change ... */
3122                         if (!(rx->sta->sta.ht_cap.cap &
3123                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3124                                 goto handled;
3125 
3126                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3127                                 max_bw = IEEE80211_STA_RX_BW_20;
3128                         else
3129                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3130 
3131                         /* set cur_max_bandwidth and recalc sta bw */
3132                         rx->sta->cur_max_bandwidth = max_bw;
3133                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3134 
3135                         if (rx->sta->sta.bandwidth == new_bw)
3136                                 goto handled;
3137 
3138                         rx->sta->sta.bandwidth = new_bw;
3139                         sband = rx->local->hw.wiphy->bands[status->band];
3140                         sta_opmode.bw =
3141                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3142                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3143 
3144                         rate_control_rate_update(local, sband, rx->sta,
3145                                                  IEEE80211_RC_BW_CHANGED);
3146                         cfg80211_sta_opmode_change_notify(sdata->dev,
3147                                                           rx->sta->addr,
3148                                                           &sta_opmode,
3149                                                           GFP_ATOMIC);
3150                         goto handled;
3151                 }
3152                 default:
3153                         goto invalid;
3154                 }
3155 
3156                 break;
3157         case WLAN_CATEGORY_PUBLIC:
3158                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3159                         goto invalid;
3160                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3161                         break;
3162                 if (!rx->sta)
3163                         break;
3164                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3165                         break;
3166                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3167                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3168                         break;
3169                 if (len < offsetof(struct ieee80211_mgmt,
3170                                    u.action.u.ext_chan_switch.variable))
3171                         goto invalid;
3172                 goto queue;
3173         case WLAN_CATEGORY_VHT:
3174                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3175                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3176                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3177                     sdata->vif.type != NL80211_IFTYPE_AP &&
3178                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3179                         break;
3180 
3181                 /* verify action code is present */
3182                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3183                         goto invalid;
3184 
3185                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3186                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3187                         /* verify opmode is present */
3188                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3189                                 goto invalid;
3190                         goto queue;
3191                 }
3192                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3193                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3194                                 goto invalid;
3195                         goto queue;
3196                 }
3197                 default:
3198                         break;
3199                 }
3200                 break;
3201         case WLAN_CATEGORY_BACK:
3202                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3203                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3204                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3205                     sdata->vif.type != NL80211_IFTYPE_AP &&
3206                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3207                         break;
3208 
3209                 /* verify action_code is present */
3210                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3211                         break;
3212 
3213                 switch (mgmt->u.action.u.addba_req.action_code) {
3214                 case WLAN_ACTION_ADDBA_REQ:
3215                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3216                                    sizeof(mgmt->u.action.u.addba_req)))
3217                                 goto invalid;
3218                         break;
3219                 case WLAN_ACTION_ADDBA_RESP:
3220                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3221                                    sizeof(mgmt->u.action.u.addba_resp)))
3222                                 goto invalid;
3223                         break;
3224                 case WLAN_ACTION_DELBA:
3225                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3226                                    sizeof(mgmt->u.action.u.delba)))
3227                                 goto invalid;
3228                         break;
3229                 default:
3230                         goto invalid;
3231                 }
3232 
3233                 goto queue;
3234         case WLAN_CATEGORY_SPECTRUM_MGMT:
3235                 /* verify action_code is present */
3236                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3237                         break;
3238 
3239                 switch (mgmt->u.action.u.measurement.action_code) {
3240                 case WLAN_ACTION_SPCT_MSR_REQ:
3241                         if (status->band != NL80211_BAND_5GHZ)
3242                                 break;
3243 
3244                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3245                                    sizeof(mgmt->u.action.u.measurement)))
3246                                 break;
3247 
3248                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3249                                 break;
3250 
3251                         ieee80211_process_measurement_req(sdata, mgmt, len);
3252                         goto handled;
3253                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3254                         u8 *bssid;
3255                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3256                                    sizeof(mgmt->u.action.u.chan_switch)))
3257                                 break;
3258 
3259                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3260                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3261                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3262                                 break;
3263 
3264                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3265                                 bssid = sdata->u.mgd.bssid;
3266                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3267                                 bssid = sdata->u.ibss.bssid;
3268                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3269                                 bssid = mgmt->sa;
3270                         else
3271                                 break;
3272 
3273                         if (!ether_addr_equal(mgmt->bssid, bssid))
3274                                 break;
3275 
3276                         goto queue;
3277                         }
3278                 }
3279                 break;
3280         case WLAN_CATEGORY_SA_QUERY:
3281                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3282                            sizeof(mgmt->u.action.u.sa_query)))
3283                         break;
3284 
3285                 switch (mgmt->u.action.u.sa_query.action) {
3286                 case WLAN_ACTION_SA_QUERY_REQUEST:
3287                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3288                                 break;
3289                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3290                         goto handled;
3291                 }
3292                 break;
3293         case WLAN_CATEGORY_SELF_PROTECTED:
3294                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3295                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3296                         break;
3297 
3298                 switch (mgmt->u.action.u.self_prot.action_code) {
3299                 case WLAN_SP_MESH_PEERING_OPEN:
3300                 case WLAN_SP_MESH_PEERING_CLOSE:
3301                 case WLAN_SP_MESH_PEERING_CONFIRM:
3302                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3303                                 goto invalid;
3304                         if (sdata->u.mesh.user_mpm)
3305                                 /* userspace handles this frame */
3306                                 break;
3307                         goto queue;
3308                 case WLAN_SP_MGK_INFORM:
3309                 case WLAN_SP_MGK_ACK:
3310                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3311                                 goto invalid;
3312                         break;
3313                 }
3314                 break;
3315         case WLAN_CATEGORY_MESH_ACTION:
3316                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3317                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3318                         break;
3319 
3320                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3321                         break;
3322                 if (mesh_action_is_path_sel(mgmt) &&
3323                     !mesh_path_sel_is_hwmp(sdata))
3324                         break;
3325                 goto queue;
3326         }
3327 
3328         return RX_CONTINUE;
3329 
3330  invalid:
3331         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3332         /* will return in the next handlers */
3333         return RX_CONTINUE;
3334 
3335  handled:
3336         if (rx->sta)
3337                 rx->sta->rx_stats.packets++;
3338         dev_kfree_skb(rx->skb);
3339         return RX_QUEUED;
3340 
3341  queue:
3342         skb_queue_tail(&sdata->skb_queue, rx->skb);
3343         ieee80211_queue_work(&local->hw, &sdata->work);
3344         if (rx->sta)
3345                 rx->sta->rx_stats.packets++;
3346         return RX_QUEUED;
3347 }
3348 
3349 static ieee80211_rx_result debug_noinline
3350 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3351 {
3352         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3353         int sig = 0;
3354 
3355         /* skip known-bad action frames and return them in the next handler */
3356         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3357                 return RX_CONTINUE;
3358 
3359         /*
3360          * Getting here means the kernel doesn't know how to handle
3361          * it, but maybe userspace does ... include returned frames
3362          * so userspace can register for those to know whether ones
3363          * it transmitted were processed or returned.
3364          */
3365 
3366         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3367             !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
3368                 sig = status->signal;
3369 
3370         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3371                              rx->skb->data, rx->skb->len, 0)) {
3372                 if (rx->sta)
3373                         rx->sta->rx_stats.packets++;
3374                 dev_kfree_skb(rx->skb);
3375                 return RX_QUEUED;
3376         }
3377 
3378         return RX_CONTINUE;
3379 }
3380 
3381 static ieee80211_rx_result debug_noinline
3382 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3383 {
3384         struct ieee80211_local *local = rx->local;
3385         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3386         struct sk_buff *nskb;
3387         struct ieee80211_sub_if_data *sdata = rx->sdata;
3388         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3389 
3390         if (!ieee80211_is_action(mgmt->frame_control))
3391                 return RX_CONTINUE;
3392 
3393         /*
3394          * For AP mode, hostapd is responsible for handling any action
3395          * frames that we didn't handle, including returning unknown
3396          * ones. For all other modes we will return them to the sender,
3397          * setting the 0x80 bit in the action category, as required by
3398          * 802.11-2012 9.24.4.
3399          * Newer versions of hostapd shall also use the management frame
3400          * registration mechanisms, but older ones still use cooked
3401          * monitor interfaces so push all frames there.
3402          */
3403         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3404             (sdata->vif.type == NL80211_IFTYPE_AP ||
3405              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3406                 return RX_DROP_MONITOR;
3407 
3408         if (is_multicast_ether_addr(mgmt->da))
3409                 return RX_DROP_MONITOR;
3410 
3411         /* do not return rejected action frames */
3412         if (mgmt->u.action.category & 0x80)
3413                 return RX_DROP_UNUSABLE;
3414 
3415         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3416                                GFP_ATOMIC);
3417         if (nskb) {
3418                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3419 
3420                 nmgmt->u.action.category |= 0x80;
3421                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3422                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3423 
3424                 memset(nskb->cb, 0, sizeof(nskb->cb));
3425 
3426                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3427                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3428 
3429                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3430                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3431                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3432                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3433                                 info->hw_queue =
3434                                         local->hw.offchannel_tx_hw_queue;
3435                 }
3436 
3437                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3438                                             status->band, 0);
3439         }
3440         dev_kfree_skb(rx->skb);
3441         return RX_QUEUED;
3442 }
3443 
3444 static ieee80211_rx_result debug_noinline
3445 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3446 {
3447         struct ieee80211_sub_if_data *sdata = rx->sdata;
3448         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3449         __le16 stype;
3450 
3451         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3452 
3453         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3454             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3455             sdata->vif.type != NL80211_IFTYPE_OCB &&
3456             sdata->vif.type != NL80211_IFTYPE_STATION)
3457                 return RX_DROP_MONITOR;
3458 
3459         switch (stype) {
3460         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3461         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3462         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3463                 /* process for all: mesh, mlme, ibss */
3464                 break;
3465         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3466         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3467         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3468         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3469                 if (is_multicast_ether_addr(mgmt->da) &&
3470                     !is_broadcast_ether_addr(mgmt->da))
3471                         return RX_DROP_MONITOR;
3472 
3473                 /* process only for station */
3474                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3475                         return RX_DROP_MONITOR;
3476                 break;
3477         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3478                 /* process only for ibss and mesh */
3479                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3480                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3481                         return RX_DROP_MONITOR;
3482                 break;
3483         default:
3484                 return RX_DROP_MONITOR;
3485         }
3486 
3487         /* queue up frame and kick off work to process it */
3488         skb_queue_tail(&sdata->skb_queue, rx->skb);
3489         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3490         if (rx->sta)
3491                 rx->sta->rx_stats.packets++;
3492 
3493         return RX_QUEUED;
3494 }
3495 
3496 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3497                                         struct ieee80211_rate *rate)
3498 {
3499         struct ieee80211_sub_if_data *sdata;
3500         struct ieee80211_local *local = rx->local;
3501         struct sk_buff *skb = rx->skb, *skb2;
3502         struct net_device *prev_dev = NULL;
3503         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3504         int needed_headroom;
3505 
3506         /*
3507          * If cooked monitor has been processed already, then
3508          * don't do it again. If not, set the flag.
3509          */
3510         if (rx->flags & IEEE80211_RX_CMNTR)
3511                 goto out_free_skb;
3512         rx->flags |= IEEE80211_RX_CMNTR;
3513 
3514         /* If there are no cooked monitor interfaces, just free the SKB */
3515         if (!local->cooked_mntrs)
3516                 goto out_free_skb;
3517 
3518         /* vendor data is long removed here */
3519         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3520         /* room for the radiotap header based on driver features */
3521         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3522 
3523         if (skb_headroom(skb) < needed_headroom &&
3524             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3525                 goto out_free_skb;
3526 
3527         /* prepend radiotap information */
3528         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3529                                          false);
3530 
3531         skb_reset_mac_header(skb);
3532         skb->ip_summed = CHECKSUM_UNNECESSARY;
3533         skb->pkt_type = PACKET_OTHERHOST;
3534         skb->protocol = htons(ETH_P_802_2);
3535 
3536         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3537                 if (!ieee80211_sdata_running(sdata))
3538                         continue;
3539 
3540                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3541                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3542                         continue;
3543 
3544                 if (prev_dev) {
3545                         skb2 = skb_clone(skb, GFP_ATOMIC);
3546                         if (skb2) {
3547                                 skb2->dev = prev_dev;
3548                                 netif_receive_skb(skb2);
3549                         }
3550                 }
3551 
3552                 prev_dev = sdata->dev;
3553                 ieee80211_rx_stats(sdata->dev, skb->len);
3554         }
3555 
3556         if (prev_dev) {
3557                 skb->dev = prev_dev;
3558                 netif_receive_skb(skb);
3559                 return;
3560         }
3561 
3562  out_free_skb:
3563         dev_kfree_skb(skb);
3564 }
3565 
3566 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3567                                          ieee80211_rx_result res)
3568 {
3569         switch (res) {
3570         case RX_DROP_MONITOR:
3571                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3572                 if (rx->sta)
3573                         rx->sta->rx_stats.dropped++;
3574                 /* fall through */
3575         case RX_CONTINUE: {
3576                 struct ieee80211_rate *rate = NULL;
3577                 struct ieee80211_supported_band *sband;
3578                 struct ieee80211_rx_status *status;
3579 
3580                 status = IEEE80211_SKB_RXCB((rx->skb));
3581 
3582                 sband = rx->local->hw.wiphy->bands[status->band];
3583                 if (status->encoding == RX_ENC_LEGACY)
3584                         rate = &sband->bitrates[status->rate_idx];
3585 
3586                 ieee80211_rx_cooked_monitor(rx, rate);
3587                 break;
3588                 }
3589         case RX_DROP_UNUSABLE:
3590                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3591                 if (rx->sta)
3592                         rx->sta->rx_stats.dropped++;
3593                 dev_kfree_skb(rx->skb);
3594                 break;
3595         case RX_QUEUED:
3596                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3597                 break;
3598         }
3599 }
3600 
3601 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3602                                   struct sk_buff_head *frames)
3603 {
3604         ieee80211_rx_result res = RX_DROP_MONITOR;
3605         struct sk_buff *skb;
3606 
3607 #define CALL_RXH(rxh)                   \
3608         do {                            \
3609                 res = rxh(rx);          \
3610                 if (res != RX_CONTINUE) \
3611                         goto rxh_next;  \
3612         } while (0)
3613 
3614         /* Lock here to avoid hitting all of the data used in the RX
3615          * path (e.g. key data, station data, ...) concurrently when
3616          * a frame is released from the reorder buffer due to timeout
3617          * from the timer, potentially concurrently with RX from the
3618          * driver.
3619          */
3620         spin_lock_bh(&rx->local->rx_path_lock);
3621 
3622         while ((skb = __skb_dequeue(frames))) {
3623                 /*
3624                  * all the other fields are valid across frames
3625                  * that belong to an aMPDU since they are on the
3626                  * same TID from the same station
3627                  */
3628                 rx->skb = skb;
3629 
3630                 CALL_RXH(ieee80211_rx_h_check_more_data);
3631                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3632                 CALL_RXH(ieee80211_rx_h_sta_process);
3633                 CALL_RXH(ieee80211_rx_h_decrypt);
3634                 CALL_RXH(ieee80211_rx_h_defragment);
3635                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3636                 /* must be after MMIC verify so header is counted in MPDU mic */
3637 #ifdef CONFIG_MAC80211_MESH
3638                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3639                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3640 #endif
3641                 CALL_RXH(ieee80211_rx_h_amsdu);
3642                 CALL_RXH(ieee80211_rx_h_data);
3643 
3644                 /* special treatment -- needs the queue */
3645                 res = ieee80211_rx_h_ctrl(rx, frames);
3646                 if (res != RX_CONTINUE)
3647                         goto rxh_next;
3648 
3649                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3650                 CALL_RXH(ieee80211_rx_h_action);
3651                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3652                 CALL_RXH(ieee80211_rx_h_action_return);
3653                 CALL_RXH(ieee80211_rx_h_mgmt);
3654 
3655  rxh_next:
3656                 ieee80211_rx_handlers_result(rx, res);
3657 
3658 #undef CALL_RXH
3659         }
3660 
3661         spin_unlock_bh(&rx->local->rx_path_lock);
3662 }
3663 
3664 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3665 {
3666         struct sk_buff_head reorder_release;
3667         ieee80211_rx_result res = RX_DROP_MONITOR;
3668 
3669         __skb_queue_head_init(&reorder_release);
3670 
3671 #define CALL_RXH(rxh)                   \
3672         do {                            \
3673                 res = rxh(rx);          \
3674                 if (res != RX_CONTINUE) \
3675                         goto rxh_next;  \
3676         } while (0)
3677 
3678         CALL_RXH(ieee80211_rx_h_check_dup);
3679         CALL_RXH(ieee80211_rx_h_check);
3680 
3681         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3682 
3683         ieee80211_rx_handlers(rx, &reorder_release);
3684         return;
3685 
3686  rxh_next:
3687         ieee80211_rx_handlers_result(rx, res);
3688 
3689 #undef CALL_RXH
3690 }
3691 
3692 /*
3693  * This function makes calls into the RX path, therefore
3694  * it has to be invoked under RCU read lock.
3695  */
3696 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3697 {
3698         struct sk_buff_head frames;
3699         struct ieee80211_rx_data rx = {
3700                 .sta = sta,
3701                 .sdata = sta->sdata,
3702                 .local = sta->local,
3703                 /* This is OK -- must be QoS data frame */
3704                 .security_idx = tid,
3705                 .seqno_idx = tid,
3706                 .napi = NULL, /* must be NULL to not have races */
3707         };
3708         struct tid_ampdu_rx *tid_agg_rx;
3709 
3710         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3711         if (!tid_agg_rx)
3712                 return;
3713 
3714         __skb_queue_head_init(&frames);
3715 
3716         spin_lock(&tid_agg_rx->reorder_lock);
3717         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3718         spin_unlock(&tid_agg_rx->reorder_lock);
3719 
3720         if (!skb_queue_empty(&frames)) {
3721                 struct ieee80211_event event = {
3722                         .type = BA_FRAME_TIMEOUT,
3723                         .u.ba.tid = tid,
3724                         .u.ba.sta = &sta->sta,
3725                 };
3726                 drv_event_callback(rx.local, rx.sdata, &event);
3727         }
3728 
3729         ieee80211_rx_handlers(&rx, &frames);
3730 }
3731 
3732 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3733                                           u16 ssn, u64 filtered,
3734                                           u16 received_mpdus)
3735 {
3736         struct sta_info *sta;
3737         struct tid_ampdu_rx *tid_agg_rx;
3738         struct sk_buff_head frames;
3739         struct ieee80211_rx_data rx = {
3740                 /* This is OK -- must be QoS data frame */
3741                 .security_idx = tid,
3742                 .seqno_idx = tid,
3743         };
3744         int i, diff;
3745 
3746         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3747                 return;
3748 
3749         __skb_queue_head_init(&frames);
3750 
3751         sta = container_of(pubsta, struct sta_info, sta);
3752 
3753         rx.sta = sta;
3754         rx.sdata = sta->sdata;
3755         rx.local = sta->local;
3756 
3757         rcu_read_lock();
3758         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3759         if (!tid_agg_rx)
3760                 goto out;
3761 
3762         spin_lock_bh(&tid_agg_rx->reorder_lock);
3763 
3764         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3765                 int release;
3766 
3767                 /* release all frames in the reorder buffer */
3768                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3769                            IEEE80211_SN_MODULO;
3770                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3771                                                  release, &frames);
3772                 /* update ssn to match received ssn */
3773                 tid_agg_rx->head_seq_num = ssn;
3774         } else {
3775                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3776                                                  &frames);
3777         }
3778 
3779         /* handle the case that received ssn is behind the mac ssn.
3780          * it can be tid_agg_rx->buf_size behind and still be valid */
3781         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3782         if (diff >= tid_agg_rx->buf_size) {
3783                 tid_agg_rx->reorder_buf_filtered = 0;
3784                 goto release;
3785         }
3786         filtered = filtered >> diff;
3787         ssn += diff;
3788 
3789         /* update bitmap */
3790         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3791                 int index = (ssn + i) % tid_agg_rx->buf_size;
3792 
3793                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3794                 if (filtered & BIT_ULL(i))
3795                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3796         }
3797 
3798         /* now process also frames that the filter marking released */
3799         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3800 
3801 release:
3802         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3803 
3804         ieee80211_rx_handlers(&rx, &frames);
3805 
3806  out:
3807         rcu_read_unlock();
3808 }
3809 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3810 
3811 /* main receive path */
3812 
3813 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3814 {
3815         struct ieee80211_sub_if_data *sdata = rx->sdata;
3816         struct sk_buff *skb = rx->skb;
3817         struct ieee80211_hdr *hdr = (void *)skb->data;
3818         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3819         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3820         bool multicast = is_multicast_ether_addr(hdr->addr1);
3821 
3822         switch (sdata->vif.type) {
3823         case NL80211_IFTYPE_STATION:
3824                 if (!bssid && !sdata->u.mgd.use_4addr)
3825                         return false;
3826                 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3827                         return false;
3828                 if (multicast)
3829                         return true;
3830                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3831         case NL80211_IFTYPE_ADHOC:
3832                 if (!bssid)
3833                         return false;
3834                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3835                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3836                         return false;
3837                 if (ieee80211_is_beacon(hdr->frame_control))
3838                         return true;
3839                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3840                         return false;
3841                 if (!multicast &&
3842                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3843                         return false;
3844                 if (!rx->sta) {
3845                         int rate_idx;
3846                         if (status->encoding != RX_ENC_LEGACY)
3847                                 rate_idx = 0; /* TODO: HT/VHT rates */
3848                         else
3849                                 rate_idx = status->rate_idx;
3850                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3851                                                  BIT(rate_idx));
3852                 }
3853                 return true;
3854         case NL80211_IFTYPE_OCB:
3855                 if (!bssid)
3856                         return false;
3857                 if (!ieee80211_is_data_present(hdr->frame_control))
3858                         return false;
3859                 if (!is_broadcast_ether_addr(bssid))
3860                         return false;
3861                 if (!multicast &&
3862                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3863                         return false;
3864                 if (!rx->sta) {
3865                         int rate_idx;
3866                         if (status->encoding != RX_ENC_LEGACY)
3867                                 rate_idx = 0; /* TODO: HT rates */
3868                         else
3869                                 rate_idx = status->rate_idx;
3870                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3871                                                 BIT(rate_idx));
3872                 }
3873                 return true;
3874         case NL80211_IFTYPE_MESH_POINT:
3875                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3876                         return false;
3877                 if (multicast)
3878                         return true;
3879                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3880         case NL80211_IFTYPE_AP_VLAN:
3881         case NL80211_IFTYPE_AP:
3882                 if (!bssid)
3883                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3884 
3885                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3886                         /*
3887                          * Accept public action frames even when the
3888                          * BSSID doesn't match, this is used for P2P
3889                          * and location updates. Note that mac80211
3890                          * itself never looks at these frames.
3891                          */
3892                         if (!multicast &&
3893                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3894                                 return false;
3895                         if (ieee80211_is_public_action(hdr, skb->len))
3896                                 return true;
3897                         return ieee80211_is_beacon(hdr->frame_control);
3898                 }
3899 
3900                 if (!ieee80211_has_tods(hdr->frame_control)) {
3901                         /* ignore data frames to TDLS-peers */
3902                         if (ieee80211_is_data(hdr->frame_control))
3903                                 return false;
3904                         /* ignore action frames to TDLS-peers */
3905                         if (ieee80211_is_action(hdr->frame_control) &&
3906                             !is_broadcast_ether_addr(bssid) &&
3907                             !ether_addr_equal(bssid, hdr->addr1))
3908                                 return false;
3909                 }
3910 
3911                 /*
3912                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3913                  * the BSSID - we've checked that already but may have accepted
3914                  * the wildcard (ff:ff:ff:ff:ff:ff).
3915                  *
3916                  * It also says:
3917                  *      The BSSID of the Data frame is determined as follows:
3918                  *      a) If the STA is contained within an AP or is associated
3919                  *         with an AP, the BSSID is the address currently in use
3920                  *         by the STA contained in the AP.
3921                  *
3922                  * So we should not accept data frames with an address that's
3923                  * multicast.
3924                  *
3925                  * Accepting it also opens a security problem because stations
3926                  * could encrypt it with the GTK and inject traffic that way.
3927                  */
3928                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3929                         return false;
3930 
3931                 return true;
3932         case NL80211_IFTYPE_WDS:
3933                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3934                         return false;
3935                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3936         case NL80211_IFTYPE_P2P_DEVICE:
3937                 return ieee80211_is_public_action(hdr, skb->len) ||
3938                        ieee80211_is_probe_req(hdr->frame_control) ||
3939                        ieee80211_is_probe_resp(hdr->frame_control) ||
3940                        ieee80211_is_beacon(hdr->frame_control);
3941         case NL80211_IFTYPE_NAN:
3942                 /* Currently no frames on NAN interface are allowed */
3943                 return false;
3944         default:
3945                 break;
3946         }
3947 
3948         WARN_ON_ONCE(1);
3949         return false;
3950 }
3951 
3952 void ieee80211_check_fast_rx(struct sta_info *sta)
3953 {
3954         struct ieee80211_sub_if_data *sdata = sta->sdata;
3955         struct ieee80211_local *local = sdata->local;
3956         struct ieee80211_key *key;
3957         struct ieee80211_fast_rx fastrx = {
3958                 .dev = sdata->dev,
3959                 .vif_type = sdata->vif.type,
3960                 .control_port_protocol = sdata->control_port_protocol,
3961         }, *old, *new = NULL;
3962         bool assign = false;
3963 
3964         /* use sparse to check that we don't return without updating */
3965         __acquire(check_fast_rx);
3966 
3967         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3968         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3969         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3970         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3971 
3972         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3973 
3974         /* fast-rx doesn't do reordering */
3975         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3976             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3977                 goto clear;
3978 
3979         switch (sdata->vif.type) {
3980         case NL80211_IFTYPE_STATION:
3981                 if (sta->sta.tdls) {
3982                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3983                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3984                         fastrx.expected_ds_bits = 0;
3985                 } else {
3986                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3987                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3988                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3989                         fastrx.expected_ds_bits =
3990                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3991                 }
3992 
3993                 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3994                         fastrx.expected_ds_bits |=
3995                                 cpu_to_le16(IEEE80211_FCTL_TODS);
3996                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3997                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3998                 }
3999 
4000                 if (!sdata->u.mgd.powersave)
4001                         break;
4002 
4003                 /* software powersave is a huge mess, avoid all of it */
4004                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4005                         goto clear;
4006                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4007                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4008                         goto clear;
4009                 break;
4010         case NL80211_IFTYPE_AP_VLAN:
4011         case NL80211_IFTYPE_AP:
4012                 /* parallel-rx requires this, at least with calls to
4013                  * ieee80211_sta_ps_transition()
4014                  */
4015                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4016                         goto clear;
4017                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4018                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4019                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4020 
4021                 fastrx.internal_forward =
4022                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4023                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4024                          !sdata->u.vlan.sta);
4025 
4026                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4027                     sdata->u.vlan.sta) {
4028                         fastrx.expected_ds_bits |=
4029                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4030                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4031                         fastrx.internal_forward = 0;
4032                 }
4033 
4034                 break;
4035         default:
4036                 goto clear;
4037         }
4038 
4039         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4040                 goto clear;
4041 
4042         rcu_read_lock();
4043         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4044         if (key) {
4045                 switch (key->conf.cipher) {
4046                 case WLAN_CIPHER_SUITE_TKIP:
4047                         /* we don't want to deal with MMIC in fast-rx */
4048                         goto clear_rcu;
4049                 case WLAN_CIPHER_SUITE_CCMP:
4050                 case WLAN_CIPHER_SUITE_CCMP_256:
4051                 case WLAN_CIPHER_SUITE_GCMP:
4052                 case WLAN_CIPHER_SUITE_GCMP_256:
4053                         break;
4054                 default:
4055                         /* we also don't want to deal with WEP or cipher scheme
4056                          * since those require looking up the key idx in the
4057                          * frame, rather than assuming the PTK is used
4058                          * (we need to revisit this once we implement the real
4059                          * PTK index, which is now valid in the spec, but we
4060                          * haven't implemented that part yet)
4061                          */
4062                         goto clear_rcu;
4063                 }
4064 
4065                 fastrx.key = true;
4066                 fastrx.icv_len = key->conf.icv_len;
4067         }
4068 
4069         assign = true;
4070  clear_rcu:
4071         rcu_read_unlock();
4072  clear:
4073         __release(check_fast_rx);
4074 
4075         if (assign)
4076                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4077 
4078         spin_lock_bh(&sta->lock);
4079         old = rcu_dereference_protected(sta->fast_rx, true);
4080         rcu_assign_pointer(sta->fast_rx, new);
4081         spin_unlock_bh(&sta->lock);
4082 
4083         if (old)
4084                 kfree_rcu(old, rcu_head);
4085 }
4086 
4087 void ieee80211_clear_fast_rx(struct sta_info *sta)
4088 {
4089         struct ieee80211_fast_rx *old;
4090 
4091         spin_lock_bh(&sta->lock);
4092         old = rcu_dereference_protected(sta->fast_rx, true);
4093         RCU_INIT_POINTER(sta->fast_rx, NULL);
4094         spin_unlock_bh(&sta->lock);
4095 
4096         if (old)
4097                 kfree_rcu(old, rcu_head);
4098 }
4099 
4100 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4101 {
4102         struct ieee80211_local *local = sdata->local;
4103         struct sta_info *sta;
4104 
4105         lockdep_assert_held(&local->sta_mtx);
4106 
4107         list_for_each_entry_rcu(sta, &local->sta_list, list) {
4108                 if (sdata != sta->sdata &&
4109                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4110                         continue;
4111                 ieee80211_check_fast_rx(sta);
4112         }
4113 }
4114 
4115 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4116 {
4117         struct ieee80211_local *local = sdata->local;
4118 
4119         mutex_lock(&local->sta_mtx);
4120         __ieee80211_check_fast_rx_iface(sdata);
4121         mutex_unlock(&local->sta_mtx);
4122 }
4123 
4124 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4125                                      struct ieee80211_fast_rx *fast_rx)
4126 {
4127         struct sk_buff *skb = rx->skb;
4128         struct ieee80211_hdr *hdr = (void *)skb->data;
4129         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4130         struct sta_info *sta = rx->sta;
4131         int orig_len = skb->len;
4132         int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4133         int snap_offs = hdrlen;
4134         struct {
4135                 u8 snap[sizeof(rfc1042_header)];
4136                 __be16 proto;
4137         } *payload __aligned(2);
4138         struct {
4139                 u8 da[ETH_ALEN];
4140                 u8 sa[ETH_ALEN];
4141         } addrs __aligned(2);
4142         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4143 
4144         if (fast_rx->uses_rss)
4145                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
4146 
4147         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4148          * to a common data structure; drivers can implement that per queue
4149          * but we don't have that information in mac80211
4150          */
4151         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4152                 return false;
4153 
4154 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4155 
4156         /* If using encryption, we also need to have:
4157          *  - PN_VALIDATED: similar, but the implementation is tricky
4158          *  - DECRYPTED: necessary for PN_VALIDATED
4159          */
4160         if (fast_rx->key &&
4161             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4162                 return false;
4163 
4164         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4165                 return false;
4166 
4167         if (unlikely(ieee80211_is_frag(hdr)))
4168                 return false;
4169 
4170         /* Since our interface address cannot be multicast, this
4171          * implicitly also rejects multicast frames without the
4172          * explicit check.
4173          *
4174          * We shouldn't get any *data* frames not addressed to us
4175          * (AP mode will accept multicast *management* frames), but
4176          * punting here will make it go through the full checks in
4177          * ieee80211_accept_frame().
4178          */
4179         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4180                 return false;
4181 
4182         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4183                                               IEEE80211_FCTL_TODS)) !=
4184             fast_rx->expected_ds_bits)
4185                 return false;
4186 
4187         /* assign the key to drop unencrypted frames (later)
4188          * and strip the IV/MIC if necessary
4189          */
4190         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4191                 /* GCMP header length is the same */
4192                 snap_offs += IEEE80211_CCMP_HDR_LEN;
4193         }
4194 
4195         if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4196                 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4197                         goto drop;
4198 
4199                 payload = (void *)(skb->data + snap_offs);
4200 
4201                 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4202                         return false;
4203 
4204                 /* Don't handle these here since they require special code.
4205                  * Accept AARP and IPX even though they should come with a
4206                  * bridge-tunnel header - but if we get them this way then
4207                  * there's little point in discarding them.
4208                  */
4209                 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4210                              payload->proto == fast_rx->control_port_protocol))
4211                         return false;
4212         }
4213 
4214         /* after this point, don't punt to the slowpath! */
4215 
4216         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4217             pskb_trim(skb, skb->len - fast_rx->icv_len))
4218                 goto drop;
4219 
4220         if (unlikely(fast_rx->sta_notify)) {
4221                 ieee80211_sta_rx_notify(rx->sdata, hdr);
4222                 fast_rx->sta_notify = false;
4223         }
4224 
4225         /* statistics part of ieee80211_rx_h_sta_process() */
4226         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
4227                 stats->last_signal = status->signal;
4228                 if (!fast_rx->uses_rss)
4229                         ewma_signal_add(&sta->rx_stats_avg.signal,
4230                                         -status->signal);
4231         }
4232 
4233         if (status->chains) {
4234                 int i;
4235 
4236                 stats->chains = status->chains;
4237                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4238                         int signal = status->chain_signal[i];
4239 
4240                         if (!(status->chains & BIT(i)))
4241                                 continue;
4242 
4243                         stats->chain_signal_last[i] = signal;
4244                         if (!fast_rx->uses_rss)
4245                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4246                                                 -signal);
4247                 }
4248         }
4249         /* end of statistics */
4250 
4251         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4252                 goto drop;
4253 
4254         if (status->rx_flags & IEEE80211_RX_AMSDU) {
4255                 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4256                     RX_QUEUED)
4257                         goto drop;
4258 
4259                 return true;
4260         }
4261 
4262         stats->last_rx = jiffies;
4263         stats->last_rate = sta_stats_encode_rate(status);
4264 
4265         stats->fragments++;
4266         stats->packets++;
4267 
4268         /* do the header conversion - first grab the addresses */
4269         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4270         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4271         /* remove the SNAP but leave the ethertype */
4272         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4273         /* push the addresses in front */
4274         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4275 
4276         skb->dev = fast_rx->dev;
4277 
4278         ieee80211_rx_stats(fast_rx->dev, skb->len);
4279 
4280         /* The seqno index has the same property as needed
4281          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4282          * for non-QoS-data frames. Here we know it's a data
4283          * frame, so count MSDUs.
4284          */
4285         u64_stats_update_begin(&stats->syncp);
4286         stats->msdu[rx->seqno_idx]++;
4287         stats->bytes += orig_len;
4288         u64_stats_update_end(&stats->syncp);
4289 
4290         if (fast_rx->internal_forward) {
4291                 struct sk_buff *xmit_skb = NULL;
4292                 if (is_multicast_ether_addr(addrs.da)) {
4293                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4294                 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4295                            sta_info_get(rx->sdata, addrs.da)) {
4296                         xmit_skb = skb;
4297                         skb = NULL;
4298                 }
4299 
4300                 if (xmit_skb) {
4301                         /*
4302                          * Send to wireless media and increase priority by 256
4303                          * to keep the received priority instead of
4304                          * reclassifying the frame (see cfg80211_classify8021d).
4305                          */
4306                         xmit_skb->priority += 256;
4307                         xmit_skb->protocol = htons(ETH_P_802_3);
4308                         skb_reset_network_header(xmit_skb);
4309                         skb_reset_mac_header(xmit_skb);
4310                         dev_queue_xmit(xmit_skb);
4311                 }
4312 
4313                 if (!skb)
4314                         return true;
4315         }
4316 
4317         /* deliver to local stack */
4318         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4319         memset(skb->cb, 0, sizeof(skb->cb));
4320         if (rx->napi)
4321                 napi_gro_receive(rx->napi, skb);
4322         else
4323                 netif_receive_skb(skb);
4324 
4325         return true;
4326  drop:
4327         dev_kfree_skb(skb);
4328         stats->dropped++;
4329         return true;
4330 }
4331 
4332 /*
4333  * This function returns whether or not the SKB
4334  * was destined for RX processing or not, which,
4335  * if consume is true, is equivalent to whether
4336  * or not the skb was consumed.
4337  */
4338 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4339                                             struct sk_buff *skb, bool consume)
4340 {
4341         struct ieee80211_local *local = rx->local;
4342         struct ieee80211_sub_if_data *sdata = rx->sdata;
4343 
4344         rx->skb = skb;
4345 
4346         /* See if we can do fast-rx; if we have to copy we already lost,
4347          * so punt in that case. We should never have to deliver a data
4348          * frame to multiple interfaces anyway.
4349          *
4350          * We skip the ieee80211_accept_frame() call and do the necessary
4351          * checking inside ieee80211_invoke_fast_rx().
4352          */
4353         if (consume && rx->sta) {
4354                 struct ieee80211_fast_rx *fast_rx;
4355 
4356                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4357                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4358                         return true;
4359         }
4360 
4361         if (!ieee80211_accept_frame(rx))
4362                 return false;
4363 
4364         if (!consume) {
4365                 skb = skb_copy(skb, GFP_ATOMIC);
4366                 if (!skb) {
4367                         if (net_ratelimit())
4368                                 wiphy_debug(local->hw.wiphy,
4369                                         "failed to copy skb for %s\n",
4370                                         sdata->name);
4371                         return true;
4372                 }
4373 
4374                 rx->skb = skb;
4375         }
4376 
4377         ieee80211_invoke_rx_handlers(rx);
4378         return true;
4379 }
4380 
4381 /*
4382  * This is the actual Rx frames handler. as it belongs to Rx path it must
4383  * be called with rcu_read_lock protection.
4384  */
4385 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4386                                          struct ieee80211_sta *pubsta,
4387                                          struct sk_buff *skb,
4388                                          struct napi_struct *napi)
4389 {
4390         struct ieee80211_local *local = hw_to_local(hw);
4391         struct ieee80211_sub_if_data *sdata;
4392         struct ieee80211_hdr *hdr;
4393         __le16 fc;
4394         struct ieee80211_rx_data rx;
4395         struct ieee80211_sub_if_data *prev;
4396         struct rhlist_head *tmp;
4397         int err = 0;
4398 
4399         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4400         memset(&rx, 0, sizeof(rx));
4401         rx.skb = skb;
4402         rx.local = local;
4403         rx.napi = napi;
4404 
4405         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4406                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4407 
4408         if (ieee80211_is_mgmt(fc)) {
4409                 /* drop frame if too short for header */
4410                 if (skb->len < ieee80211_hdrlen(fc))
4411                         err = -ENOBUFS;
4412                 else
4413                         err = skb_linearize(skb);
4414         } else {
4415                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4416         }
4417 
4418         if (err) {
4419                 dev_kfree_skb(skb);
4420                 return;
4421         }
4422 
4423         hdr = (struct ieee80211_hdr *)skb->data;
4424         ieee80211_parse_qos(&rx);
4425         ieee80211_verify_alignment(&rx);
4426 
4427         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4428                      ieee80211_is_beacon(hdr->frame_control)))
4429                 ieee80211_scan_rx(local, skb);
4430 
4431         if (ieee80211_is_data(fc)) {
4432                 struct sta_info *sta, *prev_sta;
4433 
4434                 if (pubsta) {
4435                         rx.sta = container_of(pubsta, struct sta_info, sta);
4436                         rx.sdata = rx.sta->sdata;
4437                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4438                                 return;
4439                         goto out;
4440                 }
4441 
4442                 prev_sta = NULL;
4443 
4444                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4445                         if (!prev_sta) {
4446                                 prev_sta = sta;
4447                                 continue;
4448                         }
4449 
4450                         rx.sta = prev_sta;
4451                         rx.sdata = prev_sta->sdata;
4452                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4453 
4454                         prev_sta = sta;
4455                 }
4456 
4457                 if (prev_sta) {
4458                         rx.sta = prev_sta;
4459                         rx.sdata = prev_sta->sdata;
4460 
4461                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4462                                 return;
4463                         goto out;
4464                 }
4465         }
4466 
4467         prev = NULL;
4468 
4469         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4470                 if (!ieee80211_sdata_running(sdata))
4471                         continue;
4472 
4473                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4474                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4475                         continue;
4476 
4477                 /*
4478                  * frame is destined for this interface, but if it's
4479                  * not also for the previous one we handle that after
4480                  * the loop to avoid copying the SKB once too much
4481                  */
4482 
4483                 if (!prev) {
4484                         prev = sdata;
4485                         continue;
4486                 }
4487 
4488                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4489                 rx.sdata = prev;
4490                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4491 
4492                 prev = sdata;
4493         }
4494 
4495         if (prev) {
4496                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4497                 rx.sdata = prev;
4498 
4499                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4500                         return;
4501         }
4502 
4503  out:
4504         dev_kfree_skb(skb);
4505 }
4506 
4507 /*
4508  * This is the receive path handler. It is called by a low level driver when an
4509  * 802.11 MPDU is received from the hardware.
4510  */
4511 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4512                        struct sk_buff *skb, struct napi_struct *napi)
4513 {
4514         struct ieee80211_local *local = hw_to_local(hw);
4515         struct ieee80211_rate *rate = NULL;
4516         struct ieee80211_supported_band *sband;
4517         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4518 
4519         WARN_ON_ONCE(softirq_count() == 0);
4520 
4521         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4522                 goto drop;
4523 
4524         sband = local->hw.wiphy->bands[status->band];
4525         if (WARN_ON(!sband))
4526                 goto drop;
4527 
4528         /*
4529          * If we're suspending, it is possible although not too likely
4530          * that we'd be receiving frames after having already partially
4531          * quiesced the stack. We can't process such frames then since
4532          * that might, for example, cause stations to be added or other
4533          * driver callbacks be invoked.
4534          */
4535         if (unlikely(local->quiescing || local->suspended))
4536                 goto drop;
4537 
4538         /* We might be during a HW reconfig, prevent Rx for the same reason */
4539         if (unlikely(local->in_reconfig))
4540                 goto drop;
4541 
4542         /*
4543          * The same happens when we're not even started,
4544          * but that's worth a warning.
4545          */
4546         if (WARN_ON(!local->started))
4547                 goto drop;
4548 
4549         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4550                 /*
4551                  * Validate the rate, unless a PLCP error means that
4552                  * we probably can't have a valid rate here anyway.
4553                  */
4554 
4555                 switch (status->encoding) {
4556                 case RX_ENC_HT:
4557                         /*
4558                          * rate_idx is MCS index, which can be [0-76]
4559                          * as documented on:
4560                          *
4561                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4562                          *
4563                          * Anything else would be some sort of driver or
4564                          * hardware error. The driver should catch hardware
4565                          * errors.
4566                          */
4567                         if (WARN(status->rate_idx > 76,
4568                                  "Rate marked as an HT rate but passed "
4569                                  "status->rate_idx is not "
4570                                  "an MCS index [0-76]: %d (0x%02x)\n",
4571                                  status->rate_idx,
4572                                  status->rate_idx))
4573                                 goto drop;
4574                         break;
4575                 case RX_ENC_VHT:
4576                         if (WARN_ONCE(status->rate_idx > 9 ||
4577                                       !status->nss ||
4578                                       status->nss > 8,
4579                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4580                                       status->rate_idx, status->nss))
4581                                 goto drop;
4582                         break;
4583                 case RX_ENC_HE:
4584                         if (WARN_ONCE(status->rate_idx > 11 ||
4585                                       !status->nss ||
4586                                       status->nss > 8,
4587                                       "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4588                                       status->rate_idx, status->nss))
4589                                 goto drop;
4590                         break;
4591                 default:
4592                         WARN_ON_ONCE(1);
4593                         /* fall through */
4594                 case RX_ENC_LEGACY:
4595                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4596                                 goto drop;
4597                         rate = &sband->bitrates[status->rate_idx];
4598                 }
4599         }
4600 
4601         status->rx_flags = 0;
4602 
4603         /*
4604          * key references and virtual interfaces are protected using RCU
4605          * and this requires that we are in a read-side RCU section during
4606          * receive processing
4607          */
4608         rcu_read_lock();
4609 
4610         /*
4611          * Frames with failed FCS/PLCP checksum are not returned,
4612          * all other frames are returned without radiotap header
4613          * if it was previously present.
4614          * Also, frames with less than 16 bytes are dropped.
4615          */
4616         skb = ieee80211_rx_monitor(local, skb, rate);
4617         if (!skb) {
4618                 rcu_read_unlock();
4619                 return;
4620         }
4621 
4622         ieee80211_tpt_led_trig_rx(local,
4623                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4624                         skb->len);
4625 
4626         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4627 
4628         rcu_read_unlock();
4629 
4630         return;
4631  drop:
4632         kfree_skb(skb);
4633 }
4634 EXPORT_SYMBOL(ieee80211_rx_napi);
4635 
4636 /* This is a version of the rx handler that can be called from hard irq
4637  * context. Post the skb on the queue and schedule the tasklet */
4638 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4639 {
4640         struct ieee80211_local *local = hw_to_local(hw);
4641 
4642         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4643 
4644         skb->pkt_type = IEEE80211_RX_MSG;
4645         skb_queue_tail(&local->skb_queue, skb);
4646         tasklet_schedule(&local->tasklet);
4647 }
4648 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4649 

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