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

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