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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 - 2016 Intel Deutschland GmbH
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/jiffies.h>
 15 #include <linux/slab.h>
 16 #include <linux/kernel.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/etherdevice.h>
 20 #include <linux/rcupdate.h>
 21 #include <linux/export.h>
 22 #include <linux/bitops.h>
 23 #include <net/mac80211.h>
 24 #include <net/ieee80211_radiotap.h>
 25 #include <asm/unaligned.h>
 26 
 27 #include "ieee80211_i.h"
 28 #include "driver-ops.h"
 29 #include "led.h"
 30 #include "mesh.h"
 31 #include "wep.h"
 32 #include "wpa.h"
 33 #include "tkip.h"
 34 #include "wme.h"
 35 #include "rate.h"
 36 
 37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
 38 {
 39         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 40 
 41         u64_stats_update_begin(&tstats->syncp);
 42         tstats->rx_packets++;
 43         tstats->rx_bytes += len;
 44         u64_stats_update_end(&tstats->syncp);
 45 }
 46 
 47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
 48                                enum nl80211_iftype type)
 49 {
 50         __le16 fc = hdr->frame_control;
 51 
 52         if (ieee80211_is_data(fc)) {
 53                 if (len < 24) /* drop incorrect hdr len (data) */
 54                         return NULL;
 55 
 56                 if (ieee80211_has_a4(fc))
 57                         return NULL;
 58                 if (ieee80211_has_tods(fc))
 59                         return hdr->addr1;
 60                 if (ieee80211_has_fromds(fc))
 61                         return hdr->addr2;
 62 
 63                 return hdr->addr3;
 64         }
 65 
 66         if (ieee80211_is_mgmt(fc)) {
 67                 if (len < 24) /* drop incorrect hdr len (mgmt) */
 68                         return NULL;
 69                 return hdr->addr3;
 70         }
 71 
 72         if (ieee80211_is_ctl(fc)) {
 73                 if (ieee80211_is_pspoll(fc))
 74                         return hdr->addr1;
 75 
 76                 if (ieee80211_is_back_req(fc)) {
 77                         switch (type) {
 78                         case NL80211_IFTYPE_STATION:
 79                                 return hdr->addr2;
 80                         case NL80211_IFTYPE_AP:
 81                         case NL80211_IFTYPE_AP_VLAN:
 82                                 return hdr->addr1;
 83                         default:
 84                                 break; /* fall through to the return */
 85                         }
 86                 }
 87         }
 88 
 89         return NULL;
 90 }
 91 
 92 /*
 93  * monitor mode reception
 94  *
 95  * This function cleans up the SKB, i.e. it removes all the stuff
 96  * only useful for monitoring.
 97  */
 98 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
 99                                            struct sk_buff *skb,
100                                            unsigned int rtap_vendor_space)
101 {
102         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
103                 if (likely(skb->len > FCS_LEN))
104                         __pskb_trim(skb, skb->len - FCS_LEN);
105                 else {
106                         /* driver bug */
107                         WARN_ON(1);
108                         dev_kfree_skb(skb);
109                         return NULL;
110                 }
111         }
112 
113         __pskb_pull(skb, rtap_vendor_space);
114 
115         return skb;
116 }
117 
118 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
119                                      unsigned int rtap_vendor_space)
120 {
121         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
122         struct ieee80211_hdr *hdr;
123 
124         hdr = (void *)(skb->data + rtap_vendor_space);
125 
126         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
127                             RX_FLAG_FAILED_PLCP_CRC |
128                             RX_FLAG_ONLY_MONITOR))
129                 return true;
130 
131         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
132                 return true;
133 
134         if (ieee80211_is_ctl(hdr->frame_control) &&
135             !ieee80211_is_pspoll(hdr->frame_control) &&
136             !ieee80211_is_back_req(hdr->frame_control))
137                 return true;
138 
139         return false;
140 }
141 
142 static int
143 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
144                              struct ieee80211_rx_status *status,
145                              struct sk_buff *skb)
146 {
147         int len;
148 
149         /* always present fields */
150         len = sizeof(struct ieee80211_radiotap_header) + 8;
151 
152         /* allocate extra bitmaps */
153         if (status->chains)
154                 len += 4 * hweight8(status->chains);
155 
156         if (ieee80211_have_rx_timestamp(status)) {
157                 len = ALIGN(len, 8);
158                 len += 8;
159         }
160         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
161                 len += 1;
162 
163         /* antenna field, if we don't have per-chain info */
164         if (!status->chains)
165                 len += 1;
166 
167         /* padding for RX_FLAGS if necessary */
168         len = ALIGN(len, 2);
169 
170         if (status->flag & RX_FLAG_HT) /* HT info */
171                 len += 3;
172 
173         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
174                 len = ALIGN(len, 4);
175                 len += 8;
176         }
177 
178         if (status->flag & RX_FLAG_VHT) {
179                 len = ALIGN(len, 2);
180                 len += 12;
181         }
182 
183         if (status->chains) {
184                 /* antenna and antenna signal fields */
185                 len += 2 * hweight8(status->chains);
186         }
187 
188         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
189                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
190 
191                 /* vendor presence bitmap */
192                 len += 4;
193                 /* alignment for fixed 6-byte vendor data header */
194                 len = ALIGN(len, 2);
195                 /* vendor data header */
196                 len += 6;
197                 if (WARN_ON(rtap->align == 0))
198                         rtap->align = 1;
199                 len = ALIGN(len, rtap->align);
200                 len += rtap->len + rtap->pad;
201         }
202 
203         return len;
204 }
205 
206 /*
207  * ieee80211_add_rx_radiotap_header - add radiotap header
208  *
209  * add a radiotap header containing all the fields which the hardware provided.
210  */
211 static void
212 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
213                                  struct sk_buff *skb,
214                                  struct ieee80211_rate *rate,
215                                  int rtap_len, bool has_fcs)
216 {
217         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
218         struct ieee80211_radiotap_header *rthdr;
219         unsigned char *pos;
220         __le32 *it_present;
221         u32 it_present_val;
222         u16 rx_flags = 0;
223         u16 channel_flags = 0;
224         int mpdulen, chain;
225         unsigned long chains = status->chains;
226         struct ieee80211_vendor_radiotap rtap = {};
227 
228         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
229                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
230                 /* rtap.len and rtap.pad are undone immediately */
231                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
232         }
233 
234         mpdulen = skb->len;
235         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
236                 mpdulen += FCS_LEN;
237 
238         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
239         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
240         it_present = &rthdr->it_present;
241 
242         /* radiotap header, set always present flags */
243         rthdr->it_len = cpu_to_le16(rtap_len);
244         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
245                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
246                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
247 
248         if (!status->chains)
249                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
250 
251         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
252                 it_present_val |=
253                         BIT(IEEE80211_RADIOTAP_EXT) |
254                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
255                 put_unaligned_le32(it_present_val, it_present);
256                 it_present++;
257                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
258                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
259         }
260 
261         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
262                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
263                                   BIT(IEEE80211_RADIOTAP_EXT);
264                 put_unaligned_le32(it_present_val, it_present);
265                 it_present++;
266                 it_present_val = rtap.present;
267         }
268 
269         put_unaligned_le32(it_present_val, it_present);
270 
271         pos = (void *)(it_present + 1);
272 
273         /* the order of the following fields is important */
274 
275         /* IEEE80211_RADIOTAP_TSFT */
276         if (ieee80211_have_rx_timestamp(status)) {
277                 /* padding */
278                 while ((pos - (u8 *)rthdr) & 7)
279                         *pos++ = 0;
280                 put_unaligned_le64(
281                         ieee80211_calculate_rx_timestamp(local, status,
282                                                          mpdulen, 0),
283                         pos);
284                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
285                 pos += 8;
286         }
287 
288         /* IEEE80211_RADIOTAP_FLAGS */
289         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
290                 *pos |= IEEE80211_RADIOTAP_F_FCS;
291         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
292                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
293         if (status->flag & RX_FLAG_SHORTPRE)
294                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
295         pos++;
296 
297         /* IEEE80211_RADIOTAP_RATE */
298         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
299                 /*
300                  * Without rate information don't add it. If we have,
301                  * MCS information is a separate field in radiotap,
302                  * added below. The byte here is needed as padding
303                  * for the channel though, so initialise it to 0.
304                  */
305                 *pos = 0;
306         } else {
307                 int shift = 0;
308                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
309                 if (status->flag & RX_FLAG_10MHZ)
310                         shift = 1;
311                 else if (status->flag & RX_FLAG_5MHZ)
312                         shift = 2;
313                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
314         }
315         pos++;
316 
317         /* IEEE80211_RADIOTAP_CHANNEL */
318         put_unaligned_le16(status->freq, pos);
319         pos += 2;
320         if (status->flag & RX_FLAG_10MHZ)
321                 channel_flags |= IEEE80211_CHAN_HALF;
322         else if (status->flag & RX_FLAG_5MHZ)
323                 channel_flags |= IEEE80211_CHAN_QUARTER;
324 
325         if (status->band == IEEE80211_BAND_5GHZ)
326                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
327         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
328                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
329         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
330                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
331         else if (rate)
332                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
333         else
334                 channel_flags |= IEEE80211_CHAN_2GHZ;
335         put_unaligned_le16(channel_flags, pos);
336         pos += 2;
337 
338         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
339         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
340             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
341                 *pos = status->signal;
342                 rthdr->it_present |=
343                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
344                 pos++;
345         }
346 
347         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
348 
349         if (!status->chains) {
350                 /* IEEE80211_RADIOTAP_ANTENNA */
351                 *pos = status->antenna;
352                 pos++;
353         }
354 
355         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
356 
357         /* IEEE80211_RADIOTAP_RX_FLAGS */
358         /* ensure 2 byte alignment for the 2 byte field as required */
359         if ((pos - (u8 *)rthdr) & 1)
360                 *pos++ = 0;
361         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
362                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
363         put_unaligned_le16(rx_flags, pos);
364         pos += 2;
365 
366         if (status->flag & RX_FLAG_HT) {
367                 unsigned int stbc;
368 
369                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
370                 *pos++ = local->hw.radiotap_mcs_details;
371                 *pos = 0;
372                 if (status->flag & RX_FLAG_SHORT_GI)
373                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
374                 if (status->flag & RX_FLAG_40MHZ)
375                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
376                 if (status->flag & RX_FLAG_HT_GF)
377                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
378                 if (status->flag & RX_FLAG_LDPC)
379                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
380                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
381                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
382                 pos++;
383                 *pos++ = status->rate_idx;
384         }
385 
386         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
387                 u16 flags = 0;
388 
389                 /* ensure 4 byte alignment */
390                 while ((pos - (u8 *)rthdr) & 3)
391                         pos++;
392                 rthdr->it_present |=
393                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
394                 put_unaligned_le32(status->ampdu_reference, pos);
395                 pos += 4;
396                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
397                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
398                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
399                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
400                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
401                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
402                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
403                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
404                 put_unaligned_le16(flags, pos);
405                 pos += 2;
406                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
407                         *pos++ = status->ampdu_delimiter_crc;
408                 else
409                         *pos++ = 0;
410                 *pos++ = 0;
411         }
412 
413         if (status->flag & RX_FLAG_VHT) {
414                 u16 known = local->hw.radiotap_vht_details;
415 
416                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
417                 put_unaligned_le16(known, pos);
418                 pos += 2;
419                 /* flags */
420                 if (status->flag & RX_FLAG_SHORT_GI)
421                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
422                 /* in VHT, STBC is binary */
423                 if (status->flag & RX_FLAG_STBC_MASK)
424                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
425                 if (status->vht_flag & RX_VHT_FLAG_BF)
426                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
427                 pos++;
428                 /* bandwidth */
429                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
430                         *pos++ = 4;
431                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
432                         *pos++ = 11;
433                 else if (status->flag & RX_FLAG_40MHZ)
434                         *pos++ = 1;
435                 else /* 20 MHz */
436                         *pos++ = 0;
437                 /* MCS/NSS */
438                 *pos = (status->rate_idx << 4) | status->vht_nss;
439                 pos += 4;
440                 /* coding field */
441                 if (status->flag & RX_FLAG_LDPC)
442                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
443                 pos++;
444                 /* group ID */
445                 pos++;
446                 /* partial_aid */
447                 pos += 2;
448         }
449 
450         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
451                 *pos++ = status->chain_signal[chain];
452                 *pos++ = chain;
453         }
454 
455         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
456                 /* ensure 2 byte alignment for the vendor field as required */
457                 if ((pos - (u8 *)rthdr) & 1)
458                         *pos++ = 0;
459                 *pos++ = rtap.oui[0];
460                 *pos++ = rtap.oui[1];
461                 *pos++ = rtap.oui[2];
462                 *pos++ = rtap.subns;
463                 put_unaligned_le16(rtap.len, pos);
464                 pos += 2;
465                 /* align the actual payload as requested */
466                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
467                         *pos++ = 0;
468                 /* data (and possible padding) already follows */
469         }
470 }
471 
472 /*
473  * This function copies a received frame to all monitor interfaces and
474  * returns a cleaned-up SKB that no longer includes the FCS nor the
475  * radiotap header the driver might have added.
476  */
477 static struct sk_buff *
478 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
479                      struct ieee80211_rate *rate)
480 {
481         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
482         struct ieee80211_sub_if_data *sdata;
483         int rt_hdrlen, needed_headroom;
484         struct sk_buff *skb, *skb2;
485         struct net_device *prev_dev = NULL;
486         int present_fcs_len = 0;
487         unsigned int rtap_vendor_space = 0;
488 
489         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
490                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
491 
492                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
493         }
494 
495         /*
496          * First, we may need to make a copy of the skb because
497          *  (1) we need to modify it for radiotap (if not present), and
498          *  (2) the other RX handlers will modify the skb we got.
499          *
500          * We don't need to, of course, if we aren't going to return
501          * the SKB because it has a bad FCS/PLCP checksum.
502          */
503 
504         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
505                 present_fcs_len = FCS_LEN;
506 
507         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
508         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
509                 dev_kfree_skb(origskb);
510                 return NULL;
511         }
512 
513         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
514                 if (should_drop_frame(origskb, present_fcs_len,
515                                       rtap_vendor_space)) {
516                         dev_kfree_skb(origskb);
517                         return NULL;
518                 }
519 
520                 return remove_monitor_info(local, origskb, rtap_vendor_space);
521         }
522 
523         /* room for the radiotap header based on driver features */
524         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
525         needed_headroom = rt_hdrlen - rtap_vendor_space;
526 
527         if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
528                 /* only need to expand headroom if necessary */
529                 skb = origskb;
530                 origskb = NULL;
531 
532                 /*
533                  * This shouldn't trigger often because most devices have an
534                  * RX header they pull before we get here, and that should
535                  * be big enough for our radiotap information. We should
536                  * probably export the length to drivers so that we can have
537                  * them allocate enough headroom to start with.
538                  */
539                 if (skb_headroom(skb) < needed_headroom &&
540                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
541                         dev_kfree_skb(skb);
542                         return NULL;
543                 }
544         } else {
545                 /*
546                  * Need to make a copy and possibly remove radiotap header
547                  * and FCS from the original.
548                  */
549                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
550 
551                 origskb = remove_monitor_info(local, origskb,
552                                               rtap_vendor_space);
553 
554                 if (!skb)
555                         return origskb;
556         }
557 
558         /* prepend radiotap information */
559         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
560 
561         skb_reset_mac_header(skb);
562         skb->ip_summed = CHECKSUM_UNNECESSARY;
563         skb->pkt_type = PACKET_OTHERHOST;
564         skb->protocol = htons(ETH_P_802_2);
565 
566         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
567                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
568                         continue;
569 
570                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
571                         continue;
572 
573                 if (!ieee80211_sdata_running(sdata))
574                         continue;
575 
576                 if (prev_dev) {
577                         skb2 = skb_clone(skb, GFP_ATOMIC);
578                         if (skb2) {
579                                 skb2->dev = prev_dev;
580                                 netif_receive_skb(skb2);
581                         }
582                 }
583 
584                 prev_dev = sdata->dev;
585                 ieee80211_rx_stats(sdata->dev, skb->len);
586         }
587 
588         if (prev_dev) {
589                 skb->dev = prev_dev;
590                 netif_receive_skb(skb);
591         } else
592                 dev_kfree_skb(skb);
593 
594         return origskb;
595 }
596 
597 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
598 {
599         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
600         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
601         int tid, seqno_idx, security_idx;
602 
603         /* does the frame have a qos control field? */
604         if (ieee80211_is_data_qos(hdr->frame_control)) {
605                 u8 *qc = ieee80211_get_qos_ctl(hdr);
606                 /* frame has qos control */
607                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
608                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
609                         status->rx_flags |= IEEE80211_RX_AMSDU;
610 
611                 seqno_idx = tid;
612                 security_idx = tid;
613         } else {
614                 /*
615                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
616                  *
617                  *      Sequence numbers for management frames, QoS data
618                  *      frames with a broadcast/multicast address in the
619                  *      Address 1 field, and all non-QoS data frames sent
620                  *      by QoS STAs are assigned using an additional single
621                  *      modulo-4096 counter, [...]
622                  *
623                  * We also use that counter for non-QoS STAs.
624                  */
625                 seqno_idx = IEEE80211_NUM_TIDS;
626                 security_idx = 0;
627                 if (ieee80211_is_mgmt(hdr->frame_control))
628                         security_idx = IEEE80211_NUM_TIDS;
629                 tid = 0;
630         }
631 
632         rx->seqno_idx = seqno_idx;
633         rx->security_idx = security_idx;
634         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
635          * For now, set skb->priority to 0 for other cases. */
636         rx->skb->priority = (tid > 7) ? 0 : tid;
637 }
638 
639 /**
640  * DOC: Packet alignment
641  *
642  * Drivers always need to pass packets that are aligned to two-byte boundaries
643  * to the stack.
644  *
645  * Additionally, should, if possible, align the payload data in a way that
646  * guarantees that the contained IP header is aligned to a four-byte
647  * boundary. In the case of regular frames, this simply means aligning the
648  * payload to a four-byte boundary (because either the IP header is directly
649  * contained, or IV/RFC1042 headers that have a length divisible by four are
650  * in front of it).  If the payload data is not properly aligned and the
651  * architecture doesn't support efficient unaligned operations, mac80211
652  * will align the data.
653  *
654  * With A-MSDU frames, however, the payload data address must yield two modulo
655  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
656  * push the IP header further back to a multiple of four again. Thankfully, the
657  * specs were sane enough this time around to require padding each A-MSDU
658  * subframe to a length that is a multiple of four.
659  *
660  * Padding like Atheros hardware adds which is between the 802.11 header and
661  * the payload is not supported, the driver is required to move the 802.11
662  * header to be directly in front of the payload in that case.
663  */
664 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
665 {
666 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
667         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
668 #endif
669 }
670 
671 
672 /* rx handlers */
673 
674 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
675 {
676         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677 
678         if (is_multicast_ether_addr(hdr->addr1))
679                 return 0;
680 
681         return ieee80211_is_robust_mgmt_frame(skb);
682 }
683 
684 
685 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
686 {
687         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
688 
689         if (!is_multicast_ether_addr(hdr->addr1))
690                 return 0;
691 
692         return ieee80211_is_robust_mgmt_frame(skb);
693 }
694 
695 
696 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
697 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
698 {
699         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
700         struct ieee80211_mmie *mmie;
701         struct ieee80211_mmie_16 *mmie16;
702 
703         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
704                 return -1;
705 
706         if (!ieee80211_is_robust_mgmt_frame(skb))
707                 return -1; /* not a robust management frame */
708 
709         mmie = (struct ieee80211_mmie *)
710                 (skb->data + skb->len - sizeof(*mmie));
711         if (mmie->element_id == WLAN_EID_MMIE &&
712             mmie->length == sizeof(*mmie) - 2)
713                 return le16_to_cpu(mmie->key_id);
714 
715         mmie16 = (struct ieee80211_mmie_16 *)
716                 (skb->data + skb->len - sizeof(*mmie16));
717         if (skb->len >= 24 + sizeof(*mmie16) &&
718             mmie16->element_id == WLAN_EID_MMIE &&
719             mmie16->length == sizeof(*mmie16) - 2)
720                 return le16_to_cpu(mmie16->key_id);
721 
722         return -1;
723 }
724 
725 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
726                                  struct sk_buff *skb)
727 {
728         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
729         __le16 fc;
730         int hdrlen;
731         u8 keyid;
732 
733         fc = hdr->frame_control;
734         hdrlen = ieee80211_hdrlen(fc);
735 
736         if (skb->len < hdrlen + cs->hdr_len)
737                 return -EINVAL;
738 
739         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
740         keyid &= cs->key_idx_mask;
741         keyid >>= cs->key_idx_shift;
742 
743         return keyid;
744 }
745 
746 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
747 {
748         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
749         char *dev_addr = rx->sdata->vif.addr;
750 
751         if (ieee80211_is_data(hdr->frame_control)) {
752                 if (is_multicast_ether_addr(hdr->addr1)) {
753                         if (ieee80211_has_tods(hdr->frame_control) ||
754                             !ieee80211_has_fromds(hdr->frame_control))
755                                 return RX_DROP_MONITOR;
756                         if (ether_addr_equal(hdr->addr3, dev_addr))
757                                 return RX_DROP_MONITOR;
758                 } else {
759                         if (!ieee80211_has_a4(hdr->frame_control))
760                                 return RX_DROP_MONITOR;
761                         if (ether_addr_equal(hdr->addr4, dev_addr))
762                                 return RX_DROP_MONITOR;
763                 }
764         }
765 
766         /* If there is not an established peer link and this is not a peer link
767          * establisment frame, beacon or probe, drop the frame.
768          */
769 
770         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
771                 struct ieee80211_mgmt *mgmt;
772 
773                 if (!ieee80211_is_mgmt(hdr->frame_control))
774                         return RX_DROP_MONITOR;
775 
776                 if (ieee80211_is_action(hdr->frame_control)) {
777                         u8 category;
778 
779                         /* make sure category field is present */
780                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
781                                 return RX_DROP_MONITOR;
782 
783                         mgmt = (struct ieee80211_mgmt *)hdr;
784                         category = mgmt->u.action.category;
785                         if (category != WLAN_CATEGORY_MESH_ACTION &&
786                             category != WLAN_CATEGORY_SELF_PROTECTED)
787                                 return RX_DROP_MONITOR;
788                         return RX_CONTINUE;
789                 }
790 
791                 if (ieee80211_is_probe_req(hdr->frame_control) ||
792                     ieee80211_is_probe_resp(hdr->frame_control) ||
793                     ieee80211_is_beacon(hdr->frame_control) ||
794                     ieee80211_is_auth(hdr->frame_control))
795                         return RX_CONTINUE;
796 
797                 return RX_DROP_MONITOR;
798         }
799 
800         return RX_CONTINUE;
801 }
802 
803 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
804                                               int index)
805 {
806         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
807         struct sk_buff *tail = skb_peek_tail(frames);
808         struct ieee80211_rx_status *status;
809 
810         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
811                 return true;
812 
813         if (!tail)
814                 return false;
815 
816         status = IEEE80211_SKB_RXCB(tail);
817         if (status->flag & RX_FLAG_AMSDU_MORE)
818                 return false;
819 
820         return true;
821 }
822 
823 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
824                                             struct tid_ampdu_rx *tid_agg_rx,
825                                             int index,
826                                             struct sk_buff_head *frames)
827 {
828         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
829         struct sk_buff *skb;
830         struct ieee80211_rx_status *status;
831 
832         lockdep_assert_held(&tid_agg_rx->reorder_lock);
833 
834         if (skb_queue_empty(skb_list))
835                 goto no_frame;
836 
837         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
838                 __skb_queue_purge(skb_list);
839                 goto no_frame;
840         }
841 
842         /* release frames from the reorder ring buffer */
843         tid_agg_rx->stored_mpdu_num--;
844         while ((skb = __skb_dequeue(skb_list))) {
845                 status = IEEE80211_SKB_RXCB(skb);
846                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
847                 __skb_queue_tail(frames, skb);
848         }
849 
850 no_frame:
851         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
852         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
853 }
854 
855 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
856                                              struct tid_ampdu_rx *tid_agg_rx,
857                                              u16 head_seq_num,
858                                              struct sk_buff_head *frames)
859 {
860         int index;
861 
862         lockdep_assert_held(&tid_agg_rx->reorder_lock);
863 
864         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
865                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
866                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
867                                                 frames);
868         }
869 }
870 
871 /*
872  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
873  * the skb was added to the buffer longer than this time ago, the earlier
874  * frames that have not yet been received are assumed to be lost and the skb
875  * can be released for processing. This may also release other skb's from the
876  * reorder buffer if there are no additional gaps between the frames.
877  *
878  * Callers must hold tid_agg_rx->reorder_lock.
879  */
880 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
881 
882 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
883                                           struct tid_ampdu_rx *tid_agg_rx,
884                                           struct sk_buff_head *frames)
885 {
886         int index, i, j;
887 
888         lockdep_assert_held(&tid_agg_rx->reorder_lock);
889 
890         /* release the buffer until next missing frame */
891         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
892         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
893             tid_agg_rx->stored_mpdu_num) {
894                 /*
895                  * No buffers ready to be released, but check whether any
896                  * frames in the reorder buffer have timed out.
897                  */
898                 int skipped = 1;
899                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
900                      j = (j + 1) % tid_agg_rx->buf_size) {
901                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
902                                 skipped++;
903                                 continue;
904                         }
905                         if (skipped &&
906                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
907                                         HT_RX_REORDER_BUF_TIMEOUT))
908                                 goto set_release_timer;
909 
910                         /* don't leave incomplete A-MSDUs around */
911                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
912                              i = (i + 1) % tid_agg_rx->buf_size)
913                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
914 
915                         ht_dbg_ratelimited(sdata,
916                                            "release an RX reorder frame due to timeout on earlier frames\n");
917                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
918                                                         frames);
919 
920                         /*
921                          * Increment the head seq# also for the skipped slots.
922                          */
923                         tid_agg_rx->head_seq_num =
924                                 (tid_agg_rx->head_seq_num +
925                                  skipped) & IEEE80211_SN_MASK;
926                         skipped = 0;
927                 }
928         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
929                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
930                                                 frames);
931                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
932         }
933 
934         if (tid_agg_rx->stored_mpdu_num) {
935                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
936 
937                 for (; j != (index - 1) % tid_agg_rx->buf_size;
938                      j = (j + 1) % tid_agg_rx->buf_size) {
939                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
940                                 break;
941                 }
942 
943  set_release_timer:
944 
945                 if (!tid_agg_rx->removed)
946                         mod_timer(&tid_agg_rx->reorder_timer,
947                                   tid_agg_rx->reorder_time[j] + 1 +
948                                   HT_RX_REORDER_BUF_TIMEOUT);
949         } else {
950                 del_timer(&tid_agg_rx->reorder_timer);
951         }
952 }
953 
954 /*
955  * As this function belongs to the RX path it must be under
956  * rcu_read_lock protection. It returns false if the frame
957  * can be processed immediately, true if it was consumed.
958  */
959 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
960                                              struct tid_ampdu_rx *tid_agg_rx,
961                                              struct sk_buff *skb,
962                                              struct sk_buff_head *frames)
963 {
964         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
965         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
966         u16 sc = le16_to_cpu(hdr->seq_ctrl);
967         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
968         u16 head_seq_num, buf_size;
969         int index;
970         bool ret = true;
971 
972         spin_lock(&tid_agg_rx->reorder_lock);
973 
974         /*
975          * Offloaded BA sessions have no known starting sequence number so pick
976          * one from first Rxed frame for this tid after BA was started.
977          */
978         if (unlikely(tid_agg_rx->auto_seq)) {
979                 tid_agg_rx->auto_seq = false;
980                 tid_agg_rx->ssn = mpdu_seq_num;
981                 tid_agg_rx->head_seq_num = mpdu_seq_num;
982         }
983 
984         buf_size = tid_agg_rx->buf_size;
985         head_seq_num = tid_agg_rx->head_seq_num;
986 
987         /* frame with out of date sequence number */
988         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
989                 dev_kfree_skb(skb);
990                 goto out;
991         }
992 
993         /*
994          * If frame the sequence number exceeds our buffering window
995          * size release some previous frames to make room for this one.
996          */
997         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
998                 head_seq_num = ieee80211_sn_inc(
999                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1000                 /* release stored frames up to new head to stack */
1001                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1002                                                  head_seq_num, frames);
1003         }
1004 
1005         /* Now the new frame is always in the range of the reordering buffer */
1006 
1007         index = mpdu_seq_num % tid_agg_rx->buf_size;
1008 
1009         /* check if we already stored this frame */
1010         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1011                 dev_kfree_skb(skb);
1012                 goto out;
1013         }
1014 
1015         /*
1016          * If the current MPDU is in the right order and nothing else
1017          * is stored we can process it directly, no need to buffer it.
1018          * If it is first but there's something stored, we may be able
1019          * to release frames after this one.
1020          */
1021         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1022             tid_agg_rx->stored_mpdu_num == 0) {
1023                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1024                         tid_agg_rx->head_seq_num =
1025                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1026                 ret = false;
1027                 goto out;
1028         }
1029 
1030         /* put the frame in the reordering buffer */
1031         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1032         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1033                 tid_agg_rx->reorder_time[index] = jiffies;
1034                 tid_agg_rx->stored_mpdu_num++;
1035                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1036         }
1037 
1038  out:
1039         spin_unlock(&tid_agg_rx->reorder_lock);
1040         return ret;
1041 }
1042 
1043 /*
1044  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1045  * true if the MPDU was buffered, false if it should be processed.
1046  */
1047 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1048                                        struct sk_buff_head *frames)
1049 {
1050         struct sk_buff *skb = rx->skb;
1051         struct ieee80211_local *local = rx->local;
1052         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1053         struct sta_info *sta = rx->sta;
1054         struct tid_ampdu_rx *tid_agg_rx;
1055         u16 sc;
1056         u8 tid, ack_policy;
1057 
1058         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1059             is_multicast_ether_addr(hdr->addr1))
1060                 goto dont_reorder;
1061 
1062         /*
1063          * filter the QoS data rx stream according to
1064          * STA/TID and check if this STA/TID is on aggregation
1065          */
1066 
1067         if (!sta)
1068                 goto dont_reorder;
1069 
1070         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1071                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1072         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1073 
1074         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1075         if (!tid_agg_rx)
1076                 goto dont_reorder;
1077 
1078         /* qos null data frames are excluded */
1079         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1080                 goto dont_reorder;
1081 
1082         /* not part of a BA session */
1083         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1084             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1085                 goto dont_reorder;
1086 
1087         /* new, potentially un-ordered, ampdu frame - process it */
1088 
1089         /* reset session timer */
1090         if (tid_agg_rx->timeout)
1091                 tid_agg_rx->last_rx = jiffies;
1092 
1093         /* if this mpdu is fragmented - terminate rx aggregation session */
1094         sc = le16_to_cpu(hdr->seq_ctrl);
1095         if (sc & IEEE80211_SCTL_FRAG) {
1096                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1097                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1098                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1099                 return;
1100         }
1101 
1102         /*
1103          * No locking needed -- we will only ever process one
1104          * RX packet at a time, and thus own tid_agg_rx. All
1105          * other code manipulating it needs to (and does) make
1106          * sure that we cannot get to it any more before doing
1107          * anything with it.
1108          */
1109         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1110                                              frames))
1111                 return;
1112 
1113  dont_reorder:
1114         __skb_queue_tail(frames, skb);
1115 }
1116 
1117 static ieee80211_rx_result debug_noinline
1118 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1119 {
1120         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1121         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1122 
1123         if (status->flag & RX_FLAG_DUP_VALIDATED)
1124                 return RX_CONTINUE;
1125 
1126         /*
1127          * Drop duplicate 802.11 retransmissions
1128          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1129          */
1130 
1131         if (rx->skb->len < 24)
1132                 return RX_CONTINUE;
1133 
1134         if (ieee80211_is_ctl(hdr->frame_control) ||
1135             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1136             is_multicast_ether_addr(hdr->addr1))
1137                 return RX_CONTINUE;
1138 
1139         if (!rx->sta)
1140                 return RX_CONTINUE;
1141 
1142         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1143                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1144                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1145                 rx->sta->rx_stats.num_duplicates++;
1146                 return RX_DROP_UNUSABLE;
1147         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1148                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1149         }
1150 
1151         return RX_CONTINUE;
1152 }
1153 
1154 static ieee80211_rx_result debug_noinline
1155 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1156 {
1157         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1158 
1159         /* Drop disallowed frame classes based on STA auth/assoc state;
1160          * IEEE 802.11, Chap 5.5.
1161          *
1162          * mac80211 filters only based on association state, i.e. it drops
1163          * Class 3 frames from not associated stations. hostapd sends
1164          * deauth/disassoc frames when needed. In addition, hostapd is
1165          * responsible for filtering on both auth and assoc states.
1166          */
1167 
1168         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1169                 return ieee80211_rx_mesh_check(rx);
1170 
1171         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1172                       ieee80211_is_pspoll(hdr->frame_control)) &&
1173                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1174                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1175                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1176                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1177                 /*
1178                  * accept port control frames from the AP even when it's not
1179                  * yet marked ASSOC to prevent a race where we don't set the
1180                  * assoc bit quickly enough before it sends the first frame
1181                  */
1182                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1183                     ieee80211_is_data_present(hdr->frame_control)) {
1184                         unsigned int hdrlen;
1185                         __be16 ethertype;
1186 
1187                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1188 
1189                         if (rx->skb->len < hdrlen + 8)
1190                                 return RX_DROP_MONITOR;
1191 
1192                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1193                         if (ethertype == rx->sdata->control_port_protocol)
1194                                 return RX_CONTINUE;
1195                 }
1196 
1197                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1198                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1199                                                hdr->addr2,
1200                                                GFP_ATOMIC))
1201                         return RX_DROP_UNUSABLE;
1202 
1203                 return RX_DROP_MONITOR;
1204         }
1205 
1206         return RX_CONTINUE;
1207 }
1208 
1209 
1210 static ieee80211_rx_result debug_noinline
1211 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1212 {
1213         struct ieee80211_local *local;
1214         struct ieee80211_hdr *hdr;
1215         struct sk_buff *skb;
1216 
1217         local = rx->local;
1218         skb = rx->skb;
1219         hdr = (struct ieee80211_hdr *) skb->data;
1220 
1221         if (!local->pspolling)
1222                 return RX_CONTINUE;
1223 
1224         if (!ieee80211_has_fromds(hdr->frame_control))
1225                 /* this is not from AP */
1226                 return RX_CONTINUE;
1227 
1228         if (!ieee80211_is_data(hdr->frame_control))
1229                 return RX_CONTINUE;
1230 
1231         if (!ieee80211_has_moredata(hdr->frame_control)) {
1232                 /* AP has no more frames buffered for us */
1233                 local->pspolling = false;
1234                 return RX_CONTINUE;
1235         }
1236 
1237         /* more data bit is set, let's request a new frame from the AP */
1238         ieee80211_send_pspoll(local, rx->sdata);
1239 
1240         return RX_CONTINUE;
1241 }
1242 
1243 static void sta_ps_start(struct sta_info *sta)
1244 {
1245         struct ieee80211_sub_if_data *sdata = sta->sdata;
1246         struct ieee80211_local *local = sdata->local;
1247         struct ps_data *ps;
1248         int tid;
1249 
1250         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1251             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252                 ps = &sdata->bss->ps;
1253         else
1254                 return;
1255 
1256         atomic_inc(&ps->num_sta_ps);
1257         set_sta_flag(sta, WLAN_STA_PS_STA);
1258         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1259                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1260         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1261                sta->sta.addr, sta->sta.aid);
1262 
1263         ieee80211_clear_fast_xmit(sta);
1264 
1265         if (!sta->sta.txq[0])
1266                 return;
1267 
1268         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1269                 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1270 
1271                 if (!skb_queue_len(&txqi->queue))
1272                         set_bit(tid, &sta->txq_buffered_tids);
1273                 else
1274                         clear_bit(tid, &sta->txq_buffered_tids);
1275         }
1276 }
1277 
1278 static void sta_ps_end(struct sta_info *sta)
1279 {
1280         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1281                sta->sta.addr, sta->sta.aid);
1282 
1283         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1284                 /*
1285                  * Clear the flag only if the other one is still set
1286                  * so that the TX path won't start TX'ing new frames
1287                  * directly ... In the case that the driver flag isn't
1288                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1289                  */
1290                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1291                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1292                        sta->sta.addr, sta->sta.aid);
1293                 return;
1294         }
1295 
1296         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1297         clear_sta_flag(sta, WLAN_STA_PS_STA);
1298         ieee80211_sta_ps_deliver_wakeup(sta);
1299 }
1300 
1301 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1302 {
1303         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1304         bool in_ps;
1305 
1306         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1307 
1308         /* Don't let the same PS state be set twice */
1309         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1310         if ((start && in_ps) || (!start && !in_ps))
1311                 return -EINVAL;
1312 
1313         if (start)
1314                 sta_ps_start(sta);
1315         else
1316                 sta_ps_end(sta);
1317 
1318         return 0;
1319 }
1320 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1321 
1322 static ieee80211_rx_result debug_noinline
1323 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1324 {
1325         struct ieee80211_sub_if_data *sdata = rx->sdata;
1326         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1327         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1328         int tid, ac;
1329 
1330         if (!rx->sta)
1331                 return RX_CONTINUE;
1332 
1333         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1334             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1335                 return RX_CONTINUE;
1336 
1337         /*
1338          * The device handles station powersave, so don't do anything about
1339          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1340          * it to mac80211 since they're handled.)
1341          */
1342         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1343                 return RX_CONTINUE;
1344 
1345         /*
1346          * Don't do anything if the station isn't already asleep. In
1347          * the uAPSD case, the station will probably be marked asleep,
1348          * in the PS-Poll case the station must be confused ...
1349          */
1350         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1351                 return RX_CONTINUE;
1352 
1353         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1354                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1355                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1356                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1357                         else
1358                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1359                 }
1360 
1361                 /* Free PS Poll skb here instead of returning RX_DROP that would
1362                  * count as an dropped frame. */
1363                 dev_kfree_skb(rx->skb);
1364 
1365                 return RX_QUEUED;
1366         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1367                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1368                    ieee80211_has_pm(hdr->frame_control) &&
1369                    (ieee80211_is_data_qos(hdr->frame_control) ||
1370                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1371                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1372                 ac = ieee802_1d_to_ac[tid & 7];
1373 
1374                 /*
1375                  * If this AC is not trigger-enabled do nothing.
1376                  *
1377                  * NB: This could/should check a separate bitmap of trigger-
1378                  * enabled queues, but for now we only implement uAPSD w/o
1379                  * TSPEC changes to the ACs, so they're always the same.
1380                  */
1381                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1382                         return RX_CONTINUE;
1383 
1384                 /* if we are in a service period, do nothing */
1385                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1386                         return RX_CONTINUE;
1387 
1388                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1389                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1390                 else
1391                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1392         }
1393 
1394         return RX_CONTINUE;
1395 }
1396 
1397 static ieee80211_rx_result debug_noinline
1398 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1399 {
1400         struct sta_info *sta = rx->sta;
1401         struct sk_buff *skb = rx->skb;
1402         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1403         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1404         int i;
1405 
1406         if (!sta)
1407                 return RX_CONTINUE;
1408 
1409         /*
1410          * Update last_rx only for IBSS packets which are for the current
1411          * BSSID and for station already AUTHORIZED to avoid keeping the
1412          * current IBSS network alive in cases where other STAs start
1413          * using different BSSID. This will also give the station another
1414          * chance to restart the authentication/authorization in case
1415          * something went wrong the first time.
1416          */
1417         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1418                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1419                                                 NL80211_IFTYPE_ADHOC);
1420                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1421                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1422                         sta->rx_stats.last_rx = jiffies;
1423                         if (ieee80211_is_data(hdr->frame_control) &&
1424                             !is_multicast_ether_addr(hdr->addr1)) {
1425                                 sta->rx_stats.last_rate_idx =
1426                                         status->rate_idx;
1427                                 sta->rx_stats.last_rate_flag =
1428                                         status->flag;
1429                                 sta->rx_stats.last_rate_vht_flag =
1430                                         status->vht_flag;
1431                                 sta->rx_stats.last_rate_vht_nss =
1432                                         status->vht_nss;
1433                         }
1434                 }
1435         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1436                 sta->rx_stats.last_rx = jiffies;
1437         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1438                 /*
1439                  * Mesh beacons will update last_rx when if they are found to
1440                  * match the current local configuration when processed.
1441                  */
1442                 sta->rx_stats.last_rx = jiffies;
1443                 if (ieee80211_is_data(hdr->frame_control)) {
1444                         sta->rx_stats.last_rate_idx = status->rate_idx;
1445                         sta->rx_stats.last_rate_flag = status->flag;
1446                         sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1447                         sta->rx_stats.last_rate_vht_nss = status->vht_nss;
1448                 }
1449         }
1450 
1451         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1452                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1453 
1454         sta->rx_stats.fragments++;
1455         sta->rx_stats.bytes += rx->skb->len;
1456         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1457                 sta->rx_stats.last_signal = status->signal;
1458                 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
1459         }
1460 
1461         if (status->chains) {
1462                 sta->rx_stats.chains = status->chains;
1463                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1464                         int signal = status->chain_signal[i];
1465 
1466                         if (!(status->chains & BIT(i)))
1467                                 continue;
1468 
1469                         sta->rx_stats.chain_signal_last[i] = signal;
1470                         ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1471                                         -signal);
1472                 }
1473         }
1474 
1475         /*
1476          * Change STA power saving mode only at the end of a frame
1477          * exchange sequence.
1478          */
1479         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1480             !ieee80211_has_morefrags(hdr->frame_control) &&
1481             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1482             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1483              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1484             /* PM bit is only checked in frames where it isn't reserved,
1485              * in AP mode it's reserved in non-bufferable management frames
1486              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1487              */
1488             (!ieee80211_is_mgmt(hdr->frame_control) ||
1489              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1490                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1491                         if (!ieee80211_has_pm(hdr->frame_control))
1492                                 sta_ps_end(sta);
1493                 } else {
1494                         if (ieee80211_has_pm(hdr->frame_control))
1495                                 sta_ps_start(sta);
1496                 }
1497         }
1498 
1499         /* mesh power save support */
1500         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1501                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1502 
1503         /*
1504          * Drop (qos-)data::nullfunc frames silently, since they
1505          * are used only to control station power saving mode.
1506          */
1507         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1508             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1509                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1510 
1511                 /*
1512                  * If we receive a 4-addr nullfunc frame from a STA
1513                  * that was not moved to a 4-addr STA vlan yet send
1514                  * the event to userspace and for older hostapd drop
1515                  * the frame to the monitor interface.
1516                  */
1517                 if (ieee80211_has_a4(hdr->frame_control) &&
1518                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1519                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1520                       !rx->sdata->u.vlan.sta))) {
1521                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1522                                 cfg80211_rx_unexpected_4addr_frame(
1523                                         rx->sdata->dev, sta->sta.addr,
1524                                         GFP_ATOMIC);
1525                         return RX_DROP_MONITOR;
1526                 }
1527                 /*
1528                  * Update counter and free packet here to avoid
1529                  * counting this as a dropped packed.
1530                  */
1531                 sta->rx_stats.packets++;
1532                 dev_kfree_skb(rx->skb);
1533                 return RX_QUEUED;
1534         }
1535 
1536         return RX_CONTINUE;
1537 } /* ieee80211_rx_h_sta_process */
1538 
1539 static ieee80211_rx_result debug_noinline
1540 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1541 {
1542         struct sk_buff *skb = rx->skb;
1543         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1544         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1545         int keyidx;
1546         int hdrlen;
1547         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1548         struct ieee80211_key *sta_ptk = NULL;
1549         int mmie_keyidx = -1;
1550         __le16 fc;
1551         const struct ieee80211_cipher_scheme *cs = NULL;
1552 
1553         /*
1554          * Key selection 101
1555          *
1556          * There are four types of keys:
1557          *  - GTK (group keys)
1558          *  - IGTK (group keys for management frames)
1559          *  - PTK (pairwise keys)
1560          *  - STK (station-to-station pairwise keys)
1561          *
1562          * When selecting a key, we have to distinguish between multicast
1563          * (including broadcast) and unicast frames, the latter can only
1564          * use PTKs and STKs while the former always use GTKs and IGTKs.
1565          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1566          * unicast frames can also use key indices like GTKs. Hence, if we
1567          * don't have a PTK/STK we check the key index for a WEP key.
1568          *
1569          * Note that in a regular BSS, multicast frames are sent by the
1570          * AP only, associated stations unicast the frame to the AP first
1571          * which then multicasts it on their behalf.
1572          *
1573          * There is also a slight problem in IBSS mode: GTKs are negotiated
1574          * with each station, that is something we don't currently handle.
1575          * The spec seems to expect that one negotiates the same key with
1576          * every station but there's no such requirement; VLANs could be
1577          * possible.
1578          */
1579 
1580         /* start without a key */
1581         rx->key = NULL;
1582         fc = hdr->frame_control;
1583 
1584         if (rx->sta) {
1585                 int keyid = rx->sta->ptk_idx;
1586 
1587                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1588                         cs = rx->sta->cipher_scheme;
1589                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1590                         if (unlikely(keyid < 0))
1591                                 return RX_DROP_UNUSABLE;
1592                 }
1593                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1594         }
1595 
1596         if (!ieee80211_has_protected(fc))
1597                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1598 
1599         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1600                 rx->key = sta_ptk;
1601                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1602                     (status->flag & RX_FLAG_IV_STRIPPED))
1603                         return RX_CONTINUE;
1604                 /* Skip decryption if the frame is not protected. */
1605                 if (!ieee80211_has_protected(fc))
1606                         return RX_CONTINUE;
1607         } else if (mmie_keyidx >= 0) {
1608                 /* Broadcast/multicast robust management frame / BIP */
1609                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1610                     (status->flag & RX_FLAG_IV_STRIPPED))
1611                         return RX_CONTINUE;
1612 
1613                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1614                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1615                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1616                 if (rx->sta)
1617                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1618                 if (!rx->key)
1619                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1620         } else if (!ieee80211_has_protected(fc)) {
1621                 /*
1622                  * The frame was not protected, so skip decryption. However, we
1623                  * need to set rx->key if there is a key that could have been
1624                  * used so that the frame may be dropped if encryption would
1625                  * have been expected.
1626                  */
1627                 struct ieee80211_key *key = NULL;
1628                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1629                 int i;
1630 
1631                 if (ieee80211_is_mgmt(fc) &&
1632                     is_multicast_ether_addr(hdr->addr1) &&
1633                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1634                         rx->key = key;
1635                 else {
1636                         if (rx->sta) {
1637                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1638                                         key = rcu_dereference(rx->sta->gtk[i]);
1639                                         if (key)
1640                                                 break;
1641                                 }
1642                         }
1643                         if (!key) {
1644                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1645                                         key = rcu_dereference(sdata->keys[i]);
1646                                         if (key)
1647                                                 break;
1648                                 }
1649                         }
1650                         if (key)
1651                                 rx->key = key;
1652                 }
1653                 return RX_CONTINUE;
1654         } else {
1655                 u8 keyid;
1656 
1657                 /*
1658                  * The device doesn't give us the IV so we won't be
1659                  * able to look up the key. That's ok though, we
1660                  * don't need to decrypt the frame, we just won't
1661                  * be able to keep statistics accurate.
1662                  * Except for key threshold notifications, should
1663                  * we somehow allow the driver to tell us which key
1664                  * the hardware used if this flag is set?
1665                  */
1666                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1667                     (status->flag & RX_FLAG_IV_STRIPPED))
1668                         return RX_CONTINUE;
1669 
1670                 hdrlen = ieee80211_hdrlen(fc);
1671 
1672                 if (cs) {
1673                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1674 
1675                         if (unlikely(keyidx < 0))
1676                                 return RX_DROP_UNUSABLE;
1677                 } else {
1678                         if (rx->skb->len < 8 + hdrlen)
1679                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1680                         /*
1681                          * no need to call ieee80211_wep_get_keyidx,
1682                          * it verifies a bunch of things we've done already
1683                          */
1684                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1685                         keyidx = keyid >> 6;
1686                 }
1687 
1688                 /* check per-station GTK first, if multicast packet */
1689                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1690                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1691 
1692                 /* if not found, try default key */
1693                 if (!rx->key) {
1694                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1695 
1696                         /*
1697                          * RSNA-protected unicast frames should always be
1698                          * sent with pairwise or station-to-station keys,
1699                          * but for WEP we allow using a key index as well.
1700                          */
1701                         if (rx->key &&
1702                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1703                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1704                             !is_multicast_ether_addr(hdr->addr1))
1705                                 rx->key = NULL;
1706                 }
1707         }
1708 
1709         if (rx->key) {
1710                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1711                         return RX_DROP_MONITOR;
1712 
1713                 /* TODO: add threshold stuff again */
1714         } else {
1715                 return RX_DROP_MONITOR;
1716         }
1717 
1718         switch (rx->key->conf.cipher) {
1719         case WLAN_CIPHER_SUITE_WEP40:
1720         case WLAN_CIPHER_SUITE_WEP104:
1721                 result = ieee80211_crypto_wep_decrypt(rx);
1722                 break;
1723         case WLAN_CIPHER_SUITE_TKIP:
1724                 result = ieee80211_crypto_tkip_decrypt(rx);
1725                 break;
1726         case WLAN_CIPHER_SUITE_CCMP:
1727                 result = ieee80211_crypto_ccmp_decrypt(
1728                         rx, IEEE80211_CCMP_MIC_LEN);
1729                 break;
1730         case WLAN_CIPHER_SUITE_CCMP_256:
1731                 result = ieee80211_crypto_ccmp_decrypt(
1732                         rx, IEEE80211_CCMP_256_MIC_LEN);
1733                 break;
1734         case WLAN_CIPHER_SUITE_AES_CMAC:
1735                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1736                 break;
1737         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1738                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1739                 break;
1740         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1741         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1742                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1743                 break;
1744         case WLAN_CIPHER_SUITE_GCMP:
1745         case WLAN_CIPHER_SUITE_GCMP_256:
1746                 result = ieee80211_crypto_gcmp_decrypt(rx);
1747                 break;
1748         default:
1749                 result = ieee80211_crypto_hw_decrypt(rx);
1750         }
1751 
1752         /* the hdr variable is invalid after the decrypt handlers */
1753 
1754         /* either the frame has been decrypted or will be dropped */
1755         status->flag |= RX_FLAG_DECRYPTED;
1756 
1757         return result;
1758 }
1759 
1760 static inline struct ieee80211_fragment_entry *
1761 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1762                          unsigned int frag, unsigned int seq, int rx_queue,
1763                          struct sk_buff **skb)
1764 {
1765         struct ieee80211_fragment_entry *entry;
1766 
1767         entry = &sdata->fragments[sdata->fragment_next++];
1768         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1769                 sdata->fragment_next = 0;
1770 
1771         if (!skb_queue_empty(&entry->skb_list))
1772                 __skb_queue_purge(&entry->skb_list);
1773 
1774         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1775         *skb = NULL;
1776         entry->first_frag_time = jiffies;
1777         entry->seq = seq;
1778         entry->rx_queue = rx_queue;
1779         entry->last_frag = frag;
1780         entry->check_sequential_pn = false;
1781         entry->extra_len = 0;
1782 
1783         return entry;
1784 }
1785 
1786 static inline struct ieee80211_fragment_entry *
1787 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1788                           unsigned int frag, unsigned int seq,
1789                           int rx_queue, struct ieee80211_hdr *hdr)
1790 {
1791         struct ieee80211_fragment_entry *entry;
1792         int i, idx;
1793 
1794         idx = sdata->fragment_next;
1795         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1796                 struct ieee80211_hdr *f_hdr;
1797 
1798                 idx--;
1799                 if (idx < 0)
1800                         idx = IEEE80211_FRAGMENT_MAX - 1;
1801 
1802                 entry = &sdata->fragments[idx];
1803                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1804                     entry->rx_queue != rx_queue ||
1805                     entry->last_frag + 1 != frag)
1806                         continue;
1807 
1808                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1809 
1810                 /*
1811                  * Check ftype and addresses are equal, else check next fragment
1812                  */
1813                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1814                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1815                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1816                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1817                         continue;
1818 
1819                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1820                         __skb_queue_purge(&entry->skb_list);
1821                         continue;
1822                 }
1823                 return entry;
1824         }
1825 
1826         return NULL;
1827 }
1828 
1829 static ieee80211_rx_result debug_noinline
1830 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1831 {
1832         struct ieee80211_hdr *hdr;
1833         u16 sc;
1834         __le16 fc;
1835         unsigned int frag, seq;
1836         struct ieee80211_fragment_entry *entry;
1837         struct sk_buff *skb;
1838         struct ieee80211_rx_status *status;
1839 
1840         hdr = (struct ieee80211_hdr *)rx->skb->data;
1841         fc = hdr->frame_control;
1842 
1843         if (ieee80211_is_ctl(fc))
1844                 return RX_CONTINUE;
1845 
1846         sc = le16_to_cpu(hdr->seq_ctrl);
1847         frag = sc & IEEE80211_SCTL_FRAG;
1848 
1849         if (is_multicast_ether_addr(hdr->addr1)) {
1850                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1851                 goto out_no_led;
1852         }
1853 
1854         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1855                 goto out;
1856 
1857         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1858 
1859         if (skb_linearize(rx->skb))
1860                 return RX_DROP_UNUSABLE;
1861 
1862         /*
1863          *  skb_linearize() might change the skb->data and
1864          *  previously cached variables (in this case, hdr) need to
1865          *  be refreshed with the new data.
1866          */
1867         hdr = (struct ieee80211_hdr *)rx->skb->data;
1868         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1869 
1870         if (frag == 0) {
1871                 /* This is the first fragment of a new frame. */
1872                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1873                                                  rx->seqno_idx, &(rx->skb));
1874                 if (rx->key &&
1875                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1876                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1877                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1878                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1879                     ieee80211_has_protected(fc)) {
1880                         int queue = rx->security_idx;
1881 
1882                         /* Store CCMP/GCMP PN so that we can verify that the
1883                          * next fragment has a sequential PN value.
1884                          */
1885                         entry->check_sequential_pn = true;
1886                         memcpy(entry->last_pn,
1887                                rx->key->u.ccmp.rx_pn[queue],
1888                                IEEE80211_CCMP_PN_LEN);
1889                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
1890                                               u.ccmp.rx_pn) !=
1891                                      offsetof(struct ieee80211_key,
1892                                               u.gcmp.rx_pn));
1893                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1894                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
1895                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1896                                      IEEE80211_GCMP_PN_LEN);
1897                 }
1898                 return RX_QUEUED;
1899         }
1900 
1901         /* This is a fragment for a frame that should already be pending in
1902          * fragment cache. Add this fragment to the end of the pending entry.
1903          */
1904         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1905                                           rx->seqno_idx, hdr);
1906         if (!entry) {
1907                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1908                 return RX_DROP_MONITOR;
1909         }
1910 
1911         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1912          *  MPDU PN values are not incrementing in steps of 1."
1913          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1914          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1915          */
1916         if (entry->check_sequential_pn) {
1917                 int i;
1918                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1919                 int queue;
1920 
1921                 if (!rx->key ||
1922                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1923                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1924                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1925                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1926                         return RX_DROP_UNUSABLE;
1927                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1928                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1929                         pn[i]++;
1930                         if (pn[i])
1931                                 break;
1932                 }
1933                 queue = rx->security_idx;
1934                 rpn = rx->key->u.ccmp.rx_pn[queue];
1935                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1936                         return RX_DROP_UNUSABLE;
1937                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1938         }
1939 
1940         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1941         __skb_queue_tail(&entry->skb_list, rx->skb);
1942         entry->last_frag = frag;
1943         entry->extra_len += rx->skb->len;
1944         if (ieee80211_has_morefrags(fc)) {
1945                 rx->skb = NULL;
1946                 return RX_QUEUED;
1947         }
1948 
1949         rx->skb = __skb_dequeue(&entry->skb_list);
1950         if (skb_tailroom(rx->skb) < entry->extra_len) {
1951                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1952                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1953                                               GFP_ATOMIC))) {
1954                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1955                         __skb_queue_purge(&entry->skb_list);
1956                         return RX_DROP_UNUSABLE;
1957                 }
1958         }
1959         while ((skb = __skb_dequeue(&entry->skb_list))) {
1960                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1961                 dev_kfree_skb(skb);
1962         }
1963 
1964         /* Complete frame has been reassembled - process it now */
1965         status = IEEE80211_SKB_RXCB(rx->skb);
1966 
1967  out:
1968         ieee80211_led_rx(rx->local);
1969  out_no_led:
1970         if (rx->sta)
1971                 rx->sta->rx_stats.packets++;
1972         return RX_CONTINUE;
1973 }
1974 
1975 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1976 {
1977         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1978                 return -EACCES;
1979 
1980         return 0;
1981 }
1982 
1983 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1984 {
1985         struct sk_buff *skb = rx->skb;
1986         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1987 
1988         /*
1989          * Pass through unencrypted frames if the hardware has
1990          * decrypted them already.
1991          */
1992         if (status->flag & RX_FLAG_DECRYPTED)
1993                 return 0;
1994 
1995         /* Drop unencrypted frames if key is set. */
1996         if (unlikely(!ieee80211_has_protected(fc) &&
1997                      !ieee80211_is_nullfunc(fc) &&
1998                      ieee80211_is_data(fc) && rx->key))
1999                 return -EACCES;
2000 
2001         return 0;
2002 }
2003 
2004 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2005 {
2006         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2007         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2008         __le16 fc = hdr->frame_control;
2009 
2010         /*
2011          * Pass through unencrypted frames if the hardware has
2012          * decrypted them already.
2013          */
2014         if (status->flag & RX_FLAG_DECRYPTED)
2015                 return 0;
2016 
2017         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2018                 if (unlikely(!ieee80211_has_protected(fc) &&
2019                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2020                              rx->key)) {
2021                         if (ieee80211_is_deauth(fc) ||
2022                             ieee80211_is_disassoc(fc))
2023                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2024                                                              rx->skb->data,
2025                                                              rx->skb->len);
2026                         return -EACCES;
2027                 }
2028                 /* BIP does not use Protected field, so need to check MMIE */
2029                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2030                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2031                         if (ieee80211_is_deauth(fc) ||
2032                             ieee80211_is_disassoc(fc))
2033                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2034                                                              rx->skb->data,
2035                                                              rx->skb->len);
2036                         return -EACCES;
2037                 }
2038                 /*
2039                  * When using MFP, Action frames are not allowed prior to
2040                  * having configured keys.
2041                  */
2042                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2043                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2044                         return -EACCES;
2045         }
2046 
2047         return 0;
2048 }
2049 
2050 static int
2051 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2052 {
2053         struct ieee80211_sub_if_data *sdata = rx->sdata;
2054         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2055         bool check_port_control = false;
2056         struct ethhdr *ehdr;
2057         int ret;
2058 
2059         *port_control = false;
2060         if (ieee80211_has_a4(hdr->frame_control) &&
2061             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2062                 return -1;
2063 
2064         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2065             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2066 
2067                 if (!sdata->u.mgd.use_4addr)
2068                         return -1;
2069                 else
2070                         check_port_control = true;
2071         }
2072 
2073         if (is_multicast_ether_addr(hdr->addr1) &&
2074             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2075                 return -1;
2076 
2077         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2078         if (ret < 0)
2079                 return ret;
2080 
2081         ehdr = (struct ethhdr *) rx->skb->data;
2082         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2083                 *port_control = true;
2084         else if (check_port_control)
2085                 return -1;
2086 
2087         return 0;
2088 }
2089 
2090 /*
2091  * requires that rx->skb is a frame with ethernet header
2092  */
2093 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2094 {
2095         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2096                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2097         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2098 
2099         /*
2100          * Allow EAPOL frames to us/the PAE group address regardless
2101          * of whether the frame was encrypted or not.
2102          */
2103         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2104             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2105              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2106                 return true;
2107 
2108         if (ieee80211_802_1x_port_control(rx) ||
2109             ieee80211_drop_unencrypted(rx, fc))
2110                 return false;
2111 
2112         return true;
2113 }
2114 
2115 /*
2116  * requires that rx->skb is a frame with ethernet header
2117  */
2118 static void
2119 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2120 {
2121         struct ieee80211_sub_if_data *sdata = rx->sdata;
2122         struct net_device *dev = sdata->dev;
2123         struct sk_buff *skb, *xmit_skb;
2124         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2125         struct sta_info *dsta;
2126 
2127         skb = rx->skb;
2128         xmit_skb = NULL;
2129 
2130         ieee80211_rx_stats(dev, skb->len);
2131 
2132         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2133              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2134             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2135             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2136                 if (is_multicast_ether_addr(ehdr->h_dest)) {
2137                         /*
2138                          * send multicast frames both to higher layers in
2139                          * local net stack and back to the wireless medium
2140                          */
2141                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2142                         if (!xmit_skb)
2143                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2144                                                     dev->name);
2145                 } else {
2146                         dsta = sta_info_get(sdata, skb->data);
2147                         if (dsta) {
2148                                 /*
2149                                  * The destination station is associated to
2150                                  * this AP (in this VLAN), so send the frame
2151                                  * directly to it and do not pass it to local
2152                                  * net stack.
2153                                  */
2154                                 xmit_skb = skb;
2155                                 skb = NULL;
2156                         }
2157                 }
2158         }
2159 
2160 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2161         if (skb) {
2162                 /* 'align' will only take the values 0 or 2 here since all
2163                  * frames are required to be aligned to 2-byte boundaries
2164                  * when being passed to mac80211; the code here works just
2165                  * as well if that isn't true, but mac80211 assumes it can
2166                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2167                  */
2168                 int align;
2169 
2170                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2171                 if (align) {
2172                         if (WARN_ON(skb_headroom(skb) < 3)) {
2173                                 dev_kfree_skb(skb);
2174                                 skb = NULL;
2175                         } else {
2176                                 u8 *data = skb->data;
2177                                 size_t len = skb_headlen(skb);
2178                                 skb->data -= align;
2179                                 memmove(skb->data, data, len);
2180                                 skb_set_tail_pointer(skb, len);
2181                         }
2182                 }
2183         }
2184 #endif
2185 
2186         if (skb) {
2187                 /* deliver to local stack */
2188                 skb->protocol = eth_type_trans(skb, dev);
2189                 memset(skb->cb, 0, sizeof(skb->cb));
2190                 if (rx->napi)
2191                         napi_gro_receive(rx->napi, skb);
2192                 else
2193                         netif_receive_skb(skb);
2194         }
2195 
2196         if (xmit_skb) {
2197                 /*
2198                  * Send to wireless media and increase priority by 256 to
2199                  * keep the received priority instead of reclassifying
2200                  * the frame (see cfg80211_classify8021d).
2201                  */
2202                 xmit_skb->priority += 256;
2203                 xmit_skb->protocol = htons(ETH_P_802_3);
2204                 skb_reset_network_header(xmit_skb);
2205                 skb_reset_mac_header(xmit_skb);
2206                 dev_queue_xmit(xmit_skb);
2207         }
2208 }
2209 
2210 static ieee80211_rx_result debug_noinline
2211 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2212 {
2213         struct net_device *dev = rx->sdata->dev;
2214         struct sk_buff *skb = rx->skb;
2215         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2216         __le16 fc = hdr->frame_control;
2217         struct sk_buff_head frame_list;
2218         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2219 
2220         if (unlikely(!ieee80211_is_data(fc)))
2221                 return RX_CONTINUE;
2222 
2223         if (unlikely(!ieee80211_is_data_present(fc)))
2224                 return RX_DROP_MONITOR;
2225 
2226         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2227                 return RX_CONTINUE;
2228 
2229         if (ieee80211_has_a4(hdr->frame_control) &&
2230             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2231             !rx->sdata->u.vlan.sta)
2232                 return RX_DROP_UNUSABLE;
2233 
2234         if (is_multicast_ether_addr(hdr->addr1) &&
2235             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2236               rx->sdata->u.vlan.sta) ||
2237              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2238               rx->sdata->u.mgd.use_4addr)))
2239                 return RX_DROP_UNUSABLE;
2240 
2241         skb->dev = dev;
2242         __skb_queue_head_init(&frame_list);
2243 
2244         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2245                                  rx->sdata->vif.type,
2246                                  rx->local->hw.extra_tx_headroom, true);
2247 
2248         while (!skb_queue_empty(&frame_list)) {
2249                 rx->skb = __skb_dequeue(&frame_list);
2250 
2251                 if (!ieee80211_frame_allowed(rx, fc)) {
2252                         dev_kfree_skb(rx->skb);
2253                         continue;
2254                 }
2255 
2256                 ieee80211_deliver_skb(rx);
2257         }
2258 
2259         return RX_QUEUED;
2260 }
2261 
2262 #ifdef CONFIG_MAC80211_MESH
2263 static ieee80211_rx_result
2264 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2265 {
2266         struct ieee80211_hdr *fwd_hdr, *hdr;
2267         struct ieee80211_tx_info *info;
2268         struct ieee80211s_hdr *mesh_hdr;
2269         struct sk_buff *skb = rx->skb, *fwd_skb;
2270         struct ieee80211_local *local = rx->local;
2271         struct ieee80211_sub_if_data *sdata = rx->sdata;
2272         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2273         u16 ac, q, hdrlen;
2274 
2275         hdr = (struct ieee80211_hdr *) skb->data;
2276         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2277 
2278         /* make sure fixed part of mesh header is there, also checks skb len */
2279         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2280                 return RX_DROP_MONITOR;
2281 
2282         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2283 
2284         /* make sure full mesh header is there, also checks skb len */
2285         if (!pskb_may_pull(rx->skb,
2286                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2287                 return RX_DROP_MONITOR;
2288 
2289         /* reload pointers */
2290         hdr = (struct ieee80211_hdr *) skb->data;
2291         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2292 
2293         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2294                 return RX_DROP_MONITOR;
2295 
2296         /* frame is in RMC, don't forward */
2297         if (ieee80211_is_data(hdr->frame_control) &&
2298             is_multicast_ether_addr(hdr->addr1) &&
2299             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2300                 return RX_DROP_MONITOR;
2301 
2302         if (!ieee80211_is_data(hdr->frame_control))
2303                 return RX_CONTINUE;
2304 
2305         if (!mesh_hdr->ttl)
2306                 return RX_DROP_MONITOR;
2307 
2308         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2309                 struct mesh_path *mppath;
2310                 char *proxied_addr;
2311                 char *mpp_addr;
2312 
2313                 if (is_multicast_ether_addr(hdr->addr1)) {
2314                         mpp_addr = hdr->addr3;
2315                         proxied_addr = mesh_hdr->eaddr1;
2316                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2317                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2318                         mpp_addr = hdr->addr4;
2319                         proxied_addr = mesh_hdr->eaddr2;
2320                 } else {
2321                         return RX_DROP_MONITOR;
2322                 }
2323 
2324                 rcu_read_lock();
2325                 mppath = mpp_path_lookup(sdata, proxied_addr);
2326                 if (!mppath) {
2327                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2328                 } else {
2329                         spin_lock_bh(&mppath->state_lock);
2330                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2331                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2332                         mppath->exp_time = jiffies;
2333                         spin_unlock_bh(&mppath->state_lock);
2334                 }
2335                 rcu_read_unlock();
2336         }
2337 
2338         /* Frame has reached destination.  Don't forward */
2339         if (!is_multicast_ether_addr(hdr->addr1) &&
2340             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2341                 return RX_CONTINUE;
2342 
2343         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2344         q = sdata->vif.hw_queue[ac];
2345         if (ieee80211_queue_stopped(&local->hw, q)) {
2346                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2347                 return RX_DROP_MONITOR;
2348         }
2349         skb_set_queue_mapping(skb, q);
2350 
2351         if (!--mesh_hdr->ttl) {
2352                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2353                 goto out;
2354         }
2355 
2356         if (!ifmsh->mshcfg.dot11MeshForwarding)
2357                 goto out;
2358 
2359         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2360         if (!fwd_skb) {
2361                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2362                                     sdata->name);
2363                 goto out;
2364         }
2365 
2366         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2367         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2368         info = IEEE80211_SKB_CB(fwd_skb);
2369         memset(info, 0, sizeof(*info));
2370         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2371         info->control.vif = &rx->sdata->vif;
2372         info->control.jiffies = jiffies;
2373         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2374                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2375                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2376                 /* update power mode indication when forwarding */
2377                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2378         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2379                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2380                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2381         } else {
2382                 /* unable to resolve next hop */
2383                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2384                                    fwd_hdr->addr3, 0,
2385                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2386                                    fwd_hdr->addr2);
2387                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2388                 kfree_skb(fwd_skb);
2389                 return RX_DROP_MONITOR;
2390         }
2391 
2392         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2393         ieee80211_add_pending_skb(local, fwd_skb);
2394  out:
2395         if (is_multicast_ether_addr(hdr->addr1))
2396                 return RX_CONTINUE;
2397         return RX_DROP_MONITOR;
2398 }
2399 #endif
2400 
2401 static ieee80211_rx_result debug_noinline
2402 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2403 {
2404         struct ieee80211_sub_if_data *sdata = rx->sdata;
2405         struct ieee80211_local *local = rx->local;
2406         struct net_device *dev = sdata->dev;
2407         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2408         __le16 fc = hdr->frame_control;
2409         bool port_control;
2410         int err;
2411 
2412         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2413                 return RX_CONTINUE;
2414 
2415         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2416                 return RX_DROP_MONITOR;
2417 
2418         if (rx->sta) {
2419                 /* The seqno index has the same property as needed
2420                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2421                  * for non-QoS-data frames. Here we know it's a data
2422                  * frame, so count MSDUs.
2423                  */
2424                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2425         }
2426 
2427         /*
2428          * Send unexpected-4addr-frame event to hostapd. For older versions,
2429          * also drop the frame to cooked monitor interfaces.
2430          */
2431         if (ieee80211_has_a4(hdr->frame_control) &&
2432             sdata->vif.type == NL80211_IFTYPE_AP) {
2433                 if (rx->sta &&
2434                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2435                         cfg80211_rx_unexpected_4addr_frame(
2436                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2437                 return RX_DROP_MONITOR;
2438         }
2439 
2440         err = __ieee80211_data_to_8023(rx, &port_control);
2441         if (unlikely(err))
2442                 return RX_DROP_UNUSABLE;
2443 
2444         if (!ieee80211_frame_allowed(rx, fc))
2445                 return RX_DROP_MONITOR;
2446 
2447         /* directly handle TDLS channel switch requests/responses */
2448         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2449                                                 cpu_to_be16(ETH_P_TDLS))) {
2450                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2451 
2452                 if (pskb_may_pull(rx->skb,
2453                                   offsetof(struct ieee80211_tdls_data, u)) &&
2454                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2455                     tf->category == WLAN_CATEGORY_TDLS &&
2456                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2457                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2458                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2459                         schedule_work(&local->tdls_chsw_work);
2460                         if (rx->sta)
2461                                 rx->sta->rx_stats.packets++;
2462 
2463                         return RX_QUEUED;
2464                 }
2465         }
2466 
2467         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2468             unlikely(port_control) && sdata->bss) {
2469                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2470                                      u.ap);
2471                 dev = sdata->dev;
2472                 rx->sdata = sdata;
2473         }
2474 
2475         rx->skb->dev = dev;
2476 
2477         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2478             !is_multicast_ether_addr(
2479                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2480             (!local->scanning &&
2481              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2482                         mod_timer(&local->dynamic_ps_timer, jiffies +
2483                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2484         }
2485 
2486         ieee80211_deliver_skb(rx);
2487 
2488         return RX_QUEUED;
2489 }
2490 
2491 static ieee80211_rx_result debug_noinline
2492 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2493 {
2494         struct sk_buff *skb = rx->skb;
2495         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2496         struct tid_ampdu_rx *tid_agg_rx;
2497         u16 start_seq_num;
2498         u16 tid;
2499 
2500         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2501                 return RX_CONTINUE;
2502 
2503         if (ieee80211_is_back_req(bar->frame_control)) {
2504                 struct {
2505                         __le16 control, start_seq_num;
2506                 } __packed bar_data;
2507                 struct ieee80211_event event = {
2508                         .type = BAR_RX_EVENT,
2509                 };
2510 
2511                 if (!rx->sta)
2512                         return RX_DROP_MONITOR;
2513 
2514                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2515                                   &bar_data, sizeof(bar_data)))
2516                         return RX_DROP_MONITOR;
2517 
2518                 tid = le16_to_cpu(bar_data.control) >> 12;
2519 
2520                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2521                 if (!tid_agg_rx)
2522                         return RX_DROP_MONITOR;
2523 
2524                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2525                 event.u.ba.tid = tid;
2526                 event.u.ba.ssn = start_seq_num;
2527                 event.u.ba.sta = &rx->sta->sta;
2528 
2529                 /* reset session timer */
2530                 if (tid_agg_rx->timeout)
2531                         mod_timer(&tid_agg_rx->session_timer,
2532                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2533 
2534                 spin_lock(&tid_agg_rx->reorder_lock);
2535                 /* release stored frames up to start of BAR */
2536                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2537                                                  start_seq_num, frames);
2538                 spin_unlock(&tid_agg_rx->reorder_lock);
2539 
2540                 drv_event_callback(rx->local, rx->sdata, &event);
2541 
2542                 kfree_skb(skb);
2543                 return RX_QUEUED;
2544         }
2545 
2546         /*
2547          * After this point, we only want management frames,
2548          * so we can drop all remaining control frames to
2549          * cooked monitor interfaces.
2550          */
2551         return RX_DROP_MONITOR;
2552 }
2553 
2554 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2555                                            struct ieee80211_mgmt *mgmt,
2556                                            size_t len)
2557 {
2558         struct ieee80211_local *local = sdata->local;
2559         struct sk_buff *skb;
2560         struct ieee80211_mgmt *resp;
2561 
2562         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2563                 /* Not to own unicast address */
2564                 return;
2565         }
2566 
2567         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2568             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2569                 /* Not from the current AP or not associated yet. */
2570                 return;
2571         }
2572 
2573         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2574                 /* Too short SA Query request frame */
2575                 return;
2576         }
2577 
2578         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2579         if (skb == NULL)
2580                 return;
2581 
2582         skb_reserve(skb, local->hw.extra_tx_headroom);
2583         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2584         memset(resp, 0, 24);
2585         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2586         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2587         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2588         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2589                                           IEEE80211_STYPE_ACTION);
2590         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2591         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2592         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2593         memcpy(resp->u.action.u.sa_query.trans_id,
2594                mgmt->u.action.u.sa_query.trans_id,
2595                WLAN_SA_QUERY_TR_ID_LEN);
2596 
2597         ieee80211_tx_skb(sdata, skb);
2598 }
2599 
2600 static ieee80211_rx_result debug_noinline
2601 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2602 {
2603         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2604         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2605 
2606         /*
2607          * From here on, look only at management frames.
2608          * Data and control frames are already handled,
2609          * and unknown (reserved) frames are useless.
2610          */
2611         if (rx->skb->len < 24)
2612                 return RX_DROP_MONITOR;
2613 
2614         if (!ieee80211_is_mgmt(mgmt->frame_control))
2615                 return RX_DROP_MONITOR;
2616 
2617         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2618             ieee80211_is_beacon(mgmt->frame_control) &&
2619             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2620                 int sig = 0;
2621 
2622                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2623                         sig = status->signal;
2624 
2625                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2626                                             rx->skb->data, rx->skb->len,
2627                                             status->freq, sig);
2628                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2629         }
2630 
2631         if (ieee80211_drop_unencrypted_mgmt(rx))
2632                 return RX_DROP_UNUSABLE;
2633 
2634         return RX_CONTINUE;
2635 }
2636 
2637 static ieee80211_rx_result debug_noinline
2638 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2639 {
2640         struct ieee80211_local *local = rx->local;
2641         struct ieee80211_sub_if_data *sdata = rx->sdata;
2642         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2643         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2644         int len = rx->skb->len;
2645 
2646         if (!ieee80211_is_action(mgmt->frame_control))
2647                 return RX_CONTINUE;
2648 
2649         /* drop too small frames */
2650         if (len < IEEE80211_MIN_ACTION_SIZE)
2651                 return RX_DROP_UNUSABLE;
2652 
2653         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2654             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2655             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2656                 return RX_DROP_UNUSABLE;
2657 
2658         switch (mgmt->u.action.category) {
2659         case WLAN_CATEGORY_HT:
2660                 /* reject HT action frames from stations not supporting HT */
2661                 if (!rx->sta->sta.ht_cap.ht_supported)
2662                         goto invalid;
2663 
2664                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2665                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2666                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2667                     sdata->vif.type != NL80211_IFTYPE_AP &&
2668                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2669                         break;
2670 
2671                 /* verify action & smps_control/chanwidth are present */
2672                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2673                         goto invalid;
2674 
2675                 switch (mgmt->u.action.u.ht_smps.action) {
2676                 case WLAN_HT_ACTION_SMPS: {
2677                         struct ieee80211_supported_band *sband;
2678                         enum ieee80211_smps_mode smps_mode;
2679 
2680                         /* convert to HT capability */
2681                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2682                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2683                                 smps_mode = IEEE80211_SMPS_OFF;
2684                                 break;
2685                         case WLAN_HT_SMPS_CONTROL_STATIC:
2686                                 smps_mode = IEEE80211_SMPS_STATIC;
2687                                 break;
2688                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2689                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2690                                 break;
2691                         default:
2692                                 goto invalid;
2693                         }
2694 
2695                         /* if no change do nothing */
2696                         if (rx->sta->sta.smps_mode == smps_mode)
2697                                 goto handled;
2698                         rx->sta->sta.smps_mode = smps_mode;
2699 
2700                         sband = rx->local->hw.wiphy->bands[status->band];
2701 
2702                         rate_control_rate_update(local, sband, rx->sta,
2703                                                  IEEE80211_RC_SMPS_CHANGED);
2704                         goto handled;
2705                 }
2706                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2707                         struct ieee80211_supported_band *sband;
2708                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2709                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2710 
2711                         /* If it doesn't support 40 MHz it can't change ... */
2712                         if (!(rx->sta->sta.ht_cap.cap &
2713                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2714                                 goto handled;
2715 
2716                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2717                                 max_bw = IEEE80211_STA_RX_BW_20;
2718                         else
2719                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2720 
2721                         /* set cur_max_bandwidth and recalc sta bw */
2722                         rx->sta->cur_max_bandwidth = max_bw;
2723                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2724 
2725                         if (rx->sta->sta.bandwidth == new_bw)
2726                                 goto handled;
2727 
2728                         rx->sta->sta.bandwidth = new_bw;
2729                         sband = rx->local->hw.wiphy->bands[status->band];
2730 
2731                         rate_control_rate_update(local, sband, rx->sta,
2732                                                  IEEE80211_RC_BW_CHANGED);
2733                         goto handled;
2734                 }
2735                 default:
2736                         goto invalid;
2737                 }
2738 
2739                 break;
2740         case WLAN_CATEGORY_PUBLIC:
2741                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2742                         goto invalid;
2743                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2744                         break;
2745                 if (!rx->sta)
2746                         break;
2747                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2748                         break;
2749                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2750                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2751                         break;
2752                 if (len < offsetof(struct ieee80211_mgmt,
2753                                    u.action.u.ext_chan_switch.variable))
2754                         goto invalid;
2755                 goto queue;
2756         case WLAN_CATEGORY_VHT:
2757                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2758                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2759                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2760                     sdata->vif.type != NL80211_IFTYPE_AP &&
2761                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2762                         break;
2763 
2764                 /* verify action code is present */
2765                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2766                         goto invalid;
2767 
2768                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2769                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2770                         u8 opmode;
2771 
2772                         /* verify opmode is present */
2773                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2774                                 goto invalid;
2775 
2776                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2777 
2778                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2779                                                     opmode, status->band);
2780                         goto handled;
2781                 }
2782                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2783                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2784                                 goto invalid;
2785                         goto queue;
2786                 }
2787                 default:
2788                         break;
2789                 }
2790                 break;
2791         case WLAN_CATEGORY_BACK:
2792                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2793                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2794                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2795                     sdata->vif.type != NL80211_IFTYPE_AP &&
2796                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2797                         break;
2798 
2799                 /* verify action_code is present */
2800                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2801                         break;
2802 
2803                 switch (mgmt->u.action.u.addba_req.action_code) {
2804                 case WLAN_ACTION_ADDBA_REQ:
2805                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2806                                    sizeof(mgmt->u.action.u.addba_req)))
2807                                 goto invalid;
2808                         break;
2809                 case WLAN_ACTION_ADDBA_RESP:
2810                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2811                                    sizeof(mgmt->u.action.u.addba_resp)))
2812                                 goto invalid;
2813                         break;
2814                 case WLAN_ACTION_DELBA:
2815                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2816                                    sizeof(mgmt->u.action.u.delba)))
2817                                 goto invalid;
2818                         break;
2819                 default:
2820                         goto invalid;
2821                 }
2822 
2823                 goto queue;
2824         case WLAN_CATEGORY_SPECTRUM_MGMT:
2825                 /* verify action_code is present */
2826                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2827                         break;
2828 
2829                 switch (mgmt->u.action.u.measurement.action_code) {
2830                 case WLAN_ACTION_SPCT_MSR_REQ:
2831                         if (status->band != IEEE80211_BAND_5GHZ)
2832                                 break;
2833 
2834                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2835                                    sizeof(mgmt->u.action.u.measurement)))
2836                                 break;
2837 
2838                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2839                                 break;
2840 
2841                         ieee80211_process_measurement_req(sdata, mgmt, len);
2842                         goto handled;
2843                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2844                         u8 *bssid;
2845                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2846                                    sizeof(mgmt->u.action.u.chan_switch)))
2847                                 break;
2848 
2849                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2850                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2851                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2852                                 break;
2853 
2854                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2855                                 bssid = sdata->u.mgd.bssid;
2856                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2857                                 bssid = sdata->u.ibss.bssid;
2858                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2859                                 bssid = mgmt->sa;
2860                         else
2861                                 break;
2862 
2863                         if (!ether_addr_equal(mgmt->bssid, bssid))
2864                                 break;
2865 
2866                         goto queue;
2867                         }
2868                 }
2869                 break;
2870         case WLAN_CATEGORY_SA_QUERY:
2871                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2872                            sizeof(mgmt->u.action.u.sa_query)))
2873                         break;
2874 
2875                 switch (mgmt->u.action.u.sa_query.action) {
2876                 case WLAN_ACTION_SA_QUERY_REQUEST:
2877                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2878                                 break;
2879                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2880                         goto handled;
2881                 }
2882                 break;
2883         case WLAN_CATEGORY_SELF_PROTECTED:
2884                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2885                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2886                         break;
2887 
2888                 switch (mgmt->u.action.u.self_prot.action_code) {
2889                 case WLAN_SP_MESH_PEERING_OPEN:
2890                 case WLAN_SP_MESH_PEERING_CLOSE:
2891                 case WLAN_SP_MESH_PEERING_CONFIRM:
2892                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2893                                 goto invalid;
2894                         if (sdata->u.mesh.user_mpm)
2895                                 /* userspace handles this frame */
2896                                 break;
2897                         goto queue;
2898                 case WLAN_SP_MGK_INFORM:
2899                 case WLAN_SP_MGK_ACK:
2900                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2901                                 goto invalid;
2902                         break;
2903                 }
2904                 break;
2905         case WLAN_CATEGORY_MESH_ACTION:
2906                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2907                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2908                         break;
2909 
2910                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2911                         break;
2912                 if (mesh_action_is_path_sel(mgmt) &&
2913                     !mesh_path_sel_is_hwmp(sdata))
2914                         break;
2915                 goto queue;
2916         }
2917 
2918         return RX_CONTINUE;
2919 
2920  invalid:
2921         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2922         /* will return in the next handlers */
2923         return RX_CONTINUE;
2924 
2925  handled:
2926         if (rx->sta)
2927                 rx->sta->rx_stats.packets++;
2928         dev_kfree_skb(rx->skb);
2929         return RX_QUEUED;
2930 
2931  queue:
2932         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2933         skb_queue_tail(&sdata->skb_queue, rx->skb);
2934         ieee80211_queue_work(&local->hw, &sdata->work);
2935         if (rx->sta)
2936                 rx->sta->rx_stats.packets++;
2937         return RX_QUEUED;
2938 }
2939 
2940 static ieee80211_rx_result debug_noinline
2941 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2942 {
2943         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2944         int sig = 0;
2945 
2946         /* skip known-bad action frames and return them in the next handler */
2947         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2948                 return RX_CONTINUE;
2949 
2950         /*
2951          * Getting here means the kernel doesn't know how to handle
2952          * it, but maybe userspace does ... include returned frames
2953          * so userspace can register for those to know whether ones
2954          * it transmitted were processed or returned.
2955          */
2956 
2957         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2958                 sig = status->signal;
2959 
2960         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2961                              rx->skb->data, rx->skb->len, 0)) {
2962                 if (rx->sta)
2963                         rx->sta->rx_stats.packets++;
2964                 dev_kfree_skb(rx->skb);
2965                 return RX_QUEUED;
2966         }
2967 
2968         return RX_CONTINUE;
2969 }
2970 
2971 static ieee80211_rx_result debug_noinline
2972 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2973 {
2974         struct ieee80211_local *local = rx->local;
2975         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2976         struct sk_buff *nskb;
2977         struct ieee80211_sub_if_data *sdata = rx->sdata;
2978         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2979 
2980         if (!ieee80211_is_action(mgmt->frame_control))
2981                 return RX_CONTINUE;
2982 
2983         /*
2984          * For AP mode, hostapd is responsible for handling any action
2985          * frames that we didn't handle, including returning unknown
2986          * ones. For all other modes we will return them to the sender,
2987          * setting the 0x80 bit in the action category, as required by
2988          * 802.11-2012 9.24.4.
2989          * Newer versions of hostapd shall also use the management frame
2990          * registration mechanisms, but older ones still use cooked
2991          * monitor interfaces so push all frames there.
2992          */
2993         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2994             (sdata->vif.type == NL80211_IFTYPE_AP ||
2995              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2996                 return RX_DROP_MONITOR;
2997 
2998         if (is_multicast_ether_addr(mgmt->da))
2999                 return RX_DROP_MONITOR;
3000 
3001         /* do not return rejected action frames */
3002         if (mgmt->u.action.category & 0x80)
3003                 return RX_DROP_UNUSABLE;
3004 
3005         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3006                                GFP_ATOMIC);
3007         if (nskb) {
3008                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3009 
3010                 nmgmt->u.action.category |= 0x80;
3011                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3012                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3013 
3014                 memset(nskb->cb, 0, sizeof(nskb->cb));
3015 
3016                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3017                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3018 
3019                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3020                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3021                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3022                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3023                                 info->hw_queue =
3024                                         local->hw.offchannel_tx_hw_queue;
3025                 }
3026 
3027                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3028                                             status->band);
3029         }
3030         dev_kfree_skb(rx->skb);
3031         return RX_QUEUED;
3032 }
3033 
3034 static ieee80211_rx_result debug_noinline
3035 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3036 {
3037         struct ieee80211_sub_if_data *sdata = rx->sdata;
3038         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3039         __le16 stype;
3040 
3041         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3042 
3043         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3044             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3045             sdata->vif.type != NL80211_IFTYPE_OCB &&
3046             sdata->vif.type != NL80211_IFTYPE_STATION)
3047                 return RX_DROP_MONITOR;
3048 
3049         switch (stype) {
3050         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3051         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3052         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3053                 /* process for all: mesh, mlme, ibss */
3054                 break;
3055         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3056         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3057         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3058         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3059                 if (is_multicast_ether_addr(mgmt->da) &&
3060                     !is_broadcast_ether_addr(mgmt->da))
3061                         return RX_DROP_MONITOR;
3062 
3063                 /* process only for station */
3064                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3065                         return RX_DROP_MONITOR;
3066                 break;
3067         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3068                 /* process only for ibss and mesh */
3069                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3070                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3071                         return RX_DROP_MONITOR;
3072                 break;
3073         default:
3074                 return RX_DROP_MONITOR;
3075         }
3076 
3077         /* queue up frame and kick off work to process it */
3078         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3079         skb_queue_tail(&sdata->skb_queue, rx->skb);
3080         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3081         if (rx->sta)
3082                 rx->sta->rx_stats.packets++;
3083 
3084         return RX_QUEUED;
3085 }
3086 
3087 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3088                                         struct ieee80211_rate *rate)
3089 {
3090         struct ieee80211_sub_if_data *sdata;
3091         struct ieee80211_local *local = rx->local;
3092         struct sk_buff *skb = rx->skb, *skb2;
3093         struct net_device *prev_dev = NULL;
3094         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3095         int needed_headroom;
3096 
3097         /*
3098          * If cooked monitor has been processed already, then
3099          * don't do it again. If not, set the flag.
3100          */
3101         if (rx->flags & IEEE80211_RX_CMNTR)
3102                 goto out_free_skb;
3103         rx->flags |= IEEE80211_RX_CMNTR;
3104 
3105         /* If there are no cooked monitor interfaces, just free the SKB */
3106         if (!local->cooked_mntrs)
3107                 goto out_free_skb;
3108 
3109         /* vendor data is long removed here */
3110         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3111         /* room for the radiotap header based on driver features */
3112         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3113 
3114         if (skb_headroom(skb) < needed_headroom &&
3115             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3116                 goto out_free_skb;
3117 
3118         /* prepend radiotap information */
3119         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3120                                          false);
3121 
3122         skb_reset_mac_header(skb);
3123         skb->ip_summed = CHECKSUM_UNNECESSARY;
3124         skb->pkt_type = PACKET_OTHERHOST;
3125         skb->protocol = htons(ETH_P_802_2);
3126 
3127         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3128                 if (!ieee80211_sdata_running(sdata))
3129                         continue;
3130 
3131                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3132                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3133                         continue;
3134 
3135                 if (prev_dev) {
3136                         skb2 = skb_clone(skb, GFP_ATOMIC);
3137                         if (skb2) {
3138                                 skb2->dev = prev_dev;
3139                                 netif_receive_skb(skb2);
3140                         }
3141                 }
3142 
3143                 prev_dev = sdata->dev;
3144                 ieee80211_rx_stats(sdata->dev, skb->len);
3145         }
3146 
3147         if (prev_dev) {
3148                 skb->dev = prev_dev;
3149                 netif_receive_skb(skb);
3150                 return;
3151         }
3152 
3153  out_free_skb:
3154         dev_kfree_skb(skb);
3155 }
3156 
3157 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3158                                          ieee80211_rx_result res)
3159 {
3160         switch (res) {
3161         case RX_DROP_MONITOR:
3162                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3163                 if (rx->sta)
3164                         rx->sta->rx_stats.dropped++;
3165                 /* fall through */
3166         case RX_CONTINUE: {
3167                 struct ieee80211_rate *rate = NULL;
3168                 struct ieee80211_supported_band *sband;
3169                 struct ieee80211_rx_status *status;
3170 
3171                 status = IEEE80211_SKB_RXCB((rx->skb));
3172 
3173                 sband = rx->local->hw.wiphy->bands[status->band];
3174                 if (!(status->flag & RX_FLAG_HT) &&
3175                     !(status->flag & RX_FLAG_VHT))
3176                         rate = &sband->bitrates[status->rate_idx];
3177 
3178                 ieee80211_rx_cooked_monitor(rx, rate);
3179                 break;
3180                 }
3181         case RX_DROP_UNUSABLE:
3182                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3183                 if (rx->sta)
3184                         rx->sta->rx_stats.dropped++;
3185                 dev_kfree_skb(rx->skb);
3186                 break;
3187         case RX_QUEUED:
3188                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3189                 break;
3190         }
3191 }
3192 
3193 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3194                                   struct sk_buff_head *frames)
3195 {
3196         ieee80211_rx_result res = RX_DROP_MONITOR;
3197         struct sk_buff *skb;
3198 
3199 #define CALL_RXH(rxh)                   \
3200         do {                            \
3201                 res = rxh(rx);          \
3202                 if (res != RX_CONTINUE) \
3203                         goto rxh_next;  \
3204         } while (0);
3205 
3206         /* Lock here to avoid hitting all of the data used in the RX
3207          * path (e.g. key data, station data, ...) concurrently when
3208          * a frame is released from the reorder buffer due to timeout
3209          * from the timer, potentially concurrently with RX from the
3210          * driver.
3211          */
3212         spin_lock_bh(&rx->local->rx_path_lock);
3213 
3214         while ((skb = __skb_dequeue(frames))) {
3215                 /*
3216                  * all the other fields are valid across frames
3217                  * that belong to an aMPDU since they are on the
3218                  * same TID from the same station
3219                  */
3220                 rx->skb = skb;
3221 
3222                 CALL_RXH(ieee80211_rx_h_check_more_data)
3223                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3224                 CALL_RXH(ieee80211_rx_h_sta_process)
3225                 CALL_RXH(ieee80211_rx_h_decrypt)
3226                 CALL_RXH(ieee80211_rx_h_defragment)
3227                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3228                 /* must be after MMIC verify so header is counted in MPDU mic */
3229 #ifdef CONFIG_MAC80211_MESH
3230                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3231                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3232 #endif
3233                 CALL_RXH(ieee80211_rx_h_amsdu)
3234                 CALL_RXH(ieee80211_rx_h_data)
3235 
3236                 /* special treatment -- needs the queue */
3237                 res = ieee80211_rx_h_ctrl(rx, frames);
3238                 if (res != RX_CONTINUE)
3239                         goto rxh_next;
3240 
3241                 CALL_RXH(ieee80211_rx_h_mgmt_check)
3242                 CALL_RXH(ieee80211_rx_h_action)
3243                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3244                 CALL_RXH(ieee80211_rx_h_action_return)
3245                 CALL_RXH(ieee80211_rx_h_mgmt)
3246 
3247  rxh_next:
3248                 ieee80211_rx_handlers_result(rx, res);
3249 
3250 #undef CALL_RXH
3251         }
3252 
3253         spin_unlock_bh(&rx->local->rx_path_lock);
3254 }
3255 
3256 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3257 {
3258         struct sk_buff_head reorder_release;
3259         ieee80211_rx_result res = RX_DROP_MONITOR;
3260 
3261         __skb_queue_head_init(&reorder_release);
3262 
3263 #define CALL_RXH(rxh)                   \
3264         do {                            \
3265                 res = rxh(rx);          \
3266                 if (res != RX_CONTINUE) \
3267                         goto rxh_next;  \
3268         } while (0);
3269 
3270         CALL_RXH(ieee80211_rx_h_check_dup)
3271         CALL_RXH(ieee80211_rx_h_check)
3272 
3273         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3274 
3275         ieee80211_rx_handlers(rx, &reorder_release);
3276         return;
3277 
3278  rxh_next:
3279         ieee80211_rx_handlers_result(rx, res);
3280 
3281 #undef CALL_RXH
3282 }
3283 
3284 /*
3285  * This function makes calls into the RX path, therefore
3286  * it has to be invoked under RCU read lock.
3287  */
3288 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3289 {
3290         struct sk_buff_head frames;
3291         struct ieee80211_rx_data rx = {
3292                 .sta = sta,
3293                 .sdata = sta->sdata,
3294                 .local = sta->local,
3295                 /* This is OK -- must be QoS data frame */
3296                 .security_idx = tid,
3297                 .seqno_idx = tid,
3298                 .napi = NULL, /* must be NULL to not have races */
3299         };
3300         struct tid_ampdu_rx *tid_agg_rx;
3301 
3302         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3303         if (!tid_agg_rx)
3304                 return;
3305 
3306         __skb_queue_head_init(&frames);
3307 
3308         spin_lock(&tid_agg_rx->reorder_lock);
3309         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3310         spin_unlock(&tid_agg_rx->reorder_lock);
3311 
3312         if (!skb_queue_empty(&frames)) {
3313                 struct ieee80211_event event = {
3314                         .type = BA_FRAME_TIMEOUT,
3315                         .u.ba.tid = tid,
3316                         .u.ba.sta = &sta->sta,
3317                 };
3318                 drv_event_callback(rx.local, rx.sdata, &event);
3319         }
3320 
3321         ieee80211_rx_handlers(&rx, &frames);
3322 }
3323 
3324 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3325                                           u16 ssn, u64 filtered,
3326                                           u16 received_mpdus)
3327 {
3328         struct sta_info *sta;
3329         struct tid_ampdu_rx *tid_agg_rx;
3330         struct sk_buff_head frames;
3331         struct ieee80211_rx_data rx = {
3332                 /* This is OK -- must be QoS data frame */
3333                 .security_idx = tid,
3334                 .seqno_idx = tid,
3335         };
3336         int i, diff;
3337 
3338         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3339                 return;
3340 
3341         __skb_queue_head_init(&frames);
3342 
3343         sta = container_of(pubsta, struct sta_info, sta);
3344 
3345         rx.sta = sta;
3346         rx.sdata = sta->sdata;
3347         rx.local = sta->local;
3348 
3349         rcu_read_lock();
3350         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3351         if (!tid_agg_rx)
3352                 goto out;
3353 
3354         spin_lock_bh(&tid_agg_rx->reorder_lock);
3355 
3356         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3357                 int release;
3358 
3359                 /* release all frames in the reorder buffer */
3360                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3361                            IEEE80211_SN_MODULO;
3362                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3363                                                  release, &frames);
3364                 /* update ssn to match received ssn */
3365                 tid_agg_rx->head_seq_num = ssn;
3366         } else {
3367                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3368                                                  &frames);
3369         }
3370 
3371         /* handle the case that received ssn is behind the mac ssn.
3372          * it can be tid_agg_rx->buf_size behind and still be valid */
3373         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3374         if (diff >= tid_agg_rx->buf_size) {
3375                 tid_agg_rx->reorder_buf_filtered = 0;
3376                 goto release;
3377         }
3378         filtered = filtered >> diff;
3379         ssn += diff;
3380 
3381         /* update bitmap */
3382         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3383                 int index = (ssn + i) % tid_agg_rx->buf_size;
3384 
3385                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3386                 if (filtered & BIT_ULL(i))
3387                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3388         }
3389 
3390         /* now process also frames that the filter marking released */
3391         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3392 
3393 release:
3394         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3395 
3396         ieee80211_rx_handlers(&rx, &frames);
3397 
3398  out:
3399         rcu_read_unlock();
3400 }
3401 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3402 
3403 /* main receive path */
3404 
3405 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3406 {
3407         struct ieee80211_sub_if_data *sdata = rx->sdata;
3408         struct sk_buff *skb = rx->skb;
3409         struct ieee80211_hdr *hdr = (void *)skb->data;
3410         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3411         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3412         int multicast = is_multicast_ether_addr(hdr->addr1);
3413 
3414         switch (sdata->vif.type) {
3415         case NL80211_IFTYPE_STATION:
3416                 if (!bssid && !sdata->u.mgd.use_4addr)
3417                         return false;
3418                 if (multicast)
3419                         return true;
3420                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3421         case NL80211_IFTYPE_ADHOC:
3422                 if (!bssid)
3423                         return false;
3424                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3425                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3426                         return false;
3427                 if (ieee80211_is_beacon(hdr->frame_control))
3428                         return true;
3429                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3430                         return false;
3431                 if (!multicast &&
3432                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3433                         return false;
3434                 if (!rx->sta) {
3435                         int rate_idx;
3436                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3437                                 rate_idx = 0; /* TODO: HT/VHT rates */
3438                         else
3439                                 rate_idx = status->rate_idx;
3440                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3441                                                  BIT(rate_idx));
3442                 }
3443                 return true;
3444         case NL80211_IFTYPE_OCB:
3445                 if (!bssid)
3446                         return false;
3447                 if (!ieee80211_is_data_present(hdr->frame_control))
3448                         return false;
3449                 if (!is_broadcast_ether_addr(bssid))
3450                         return false;
3451                 if (!multicast &&
3452                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3453                         return false;
3454                 if (!rx->sta) {
3455                         int rate_idx;
3456                         if (status->flag & RX_FLAG_HT)
3457                                 rate_idx = 0; /* TODO: HT rates */
3458                         else
3459                                 rate_idx = status->rate_idx;
3460                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3461                                                 BIT(rate_idx));
3462                 }
3463                 return true;
3464         case NL80211_IFTYPE_MESH_POINT:
3465                 if (multicast)
3466                         return true;
3467                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3468         case NL80211_IFTYPE_AP_VLAN:
3469         case NL80211_IFTYPE_AP:
3470                 if (!bssid)
3471                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3472 
3473                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3474                         /*
3475                          * Accept public action frames even when the
3476                          * BSSID doesn't match, this is used for P2P
3477                          * and location updates. Note that mac80211
3478                          * itself never looks at these frames.
3479                          */
3480                         if (!multicast &&
3481                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3482                                 return false;
3483                         if (ieee80211_is_public_action(hdr, skb->len))
3484                                 return true;
3485                         return ieee80211_is_beacon(hdr->frame_control);
3486                 }
3487 
3488                 if (!ieee80211_has_tods(hdr->frame_control)) {
3489                         /* ignore data frames to TDLS-peers */
3490                         if (ieee80211_is_data(hdr->frame_control))
3491                                 return false;
3492                         /* ignore action frames to TDLS-peers */
3493                         if (ieee80211_is_action(hdr->frame_control) &&
3494                             !is_broadcast_ether_addr(bssid) &&
3495                             !ether_addr_equal(bssid, hdr->addr1))
3496                                 return false;
3497                 }
3498                 return true;
3499         case NL80211_IFTYPE_WDS:
3500                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3501                         return false;
3502                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3503         case NL80211_IFTYPE_P2P_DEVICE:
3504                 return ieee80211_is_public_action(hdr, skb->len) ||
3505                        ieee80211_is_probe_req(hdr->frame_control) ||
3506                        ieee80211_is_probe_resp(hdr->frame_control) ||
3507                        ieee80211_is_beacon(hdr->frame_control);
3508         default:
3509                 break;
3510         }
3511 
3512         WARN_ON_ONCE(1);
3513         return false;
3514 }
3515 
3516 /*
3517  * This function returns whether or not the SKB
3518  * was destined for RX processing or not, which,
3519  * if consume is true, is equivalent to whether
3520  * or not the skb was consumed.
3521  */
3522 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3523                                             struct sk_buff *skb, bool consume)
3524 {
3525         struct ieee80211_local *local = rx->local;
3526         struct ieee80211_sub_if_data *sdata = rx->sdata;
3527 
3528         rx->skb = skb;
3529 
3530         if (!ieee80211_accept_frame(rx))
3531                 return false;
3532 
3533         if (!consume) {
3534                 skb = skb_copy(skb, GFP_ATOMIC);
3535                 if (!skb) {
3536                         if (net_ratelimit())
3537                                 wiphy_debug(local->hw.wiphy,
3538                                         "failed to copy skb for %s\n",
3539                                         sdata->name);
3540                         return true;
3541                 }
3542 
3543                 rx->skb = skb;
3544         }
3545 
3546         ieee80211_invoke_rx_handlers(rx);
3547         return true;
3548 }
3549 
3550 /*
3551  * This is the actual Rx frames handler. as it belongs to Rx path it must
3552  * be called with rcu_read_lock protection.
3553  */
3554 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3555                                          struct sk_buff *skb,
3556                                          struct napi_struct *napi)
3557 {
3558         struct ieee80211_local *local = hw_to_local(hw);
3559         struct ieee80211_sub_if_data *sdata;
3560         struct ieee80211_hdr *hdr;
3561         __le16 fc;
3562         struct ieee80211_rx_data rx;
3563         struct ieee80211_sub_if_data *prev;
3564         struct sta_info *sta, *prev_sta;
3565         struct rhash_head *tmp;
3566         int err = 0;
3567 
3568         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3569         memset(&rx, 0, sizeof(rx));
3570         rx.skb = skb;
3571         rx.local = local;
3572         rx.napi = napi;
3573 
3574         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3575                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3576 
3577         if (ieee80211_is_mgmt(fc)) {
3578                 /* drop frame if too short for header */
3579                 if (skb->len < ieee80211_hdrlen(fc))
3580                         err = -ENOBUFS;
3581                 else
3582                         err = skb_linearize(skb);
3583         } else {
3584                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3585         }
3586 
3587         if (err) {
3588                 dev_kfree_skb(skb);
3589                 return;
3590         }
3591 
3592         hdr = (struct ieee80211_hdr *)skb->data;
3593         ieee80211_parse_qos(&rx);
3594         ieee80211_verify_alignment(&rx);
3595 
3596         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3597                      ieee80211_is_beacon(hdr->frame_control)))
3598                 ieee80211_scan_rx(local, skb);
3599 
3600         if (ieee80211_is_data(fc)) {
3601                 const struct bucket_table *tbl;
3602 
3603                 prev_sta = NULL;
3604 
3605                 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3606 
3607                 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3608                         if (!prev_sta) {
3609                                 prev_sta = sta;
3610                                 continue;
3611                         }
3612 
3613                         rx.sta = prev_sta;
3614                         rx.sdata = prev_sta->sdata;
3615                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3616 
3617                         prev_sta = sta;
3618                 }
3619 
3620                 if (prev_sta) {
3621                         rx.sta = prev_sta;
3622                         rx.sdata = prev_sta->sdata;
3623 
3624                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3625                                 return;
3626                         goto out;
3627                 }
3628         }
3629 
3630         prev = NULL;
3631 
3632         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3633                 if (!ieee80211_sdata_running(sdata))
3634                         continue;
3635 
3636                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3637                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3638                         continue;
3639 
3640                 /*
3641                  * frame is destined for this interface, but if it's
3642                  * not also for the previous one we handle that after
3643                  * the loop to avoid copying the SKB once too much
3644                  */
3645 
3646                 if (!prev) {
3647                         prev = sdata;
3648                         continue;
3649                 }
3650 
3651                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3652                 rx.sdata = prev;
3653                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3654 
3655                 prev = sdata;
3656         }
3657 
3658         if (prev) {
3659                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3660                 rx.sdata = prev;
3661 
3662                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3663                         return;
3664         }
3665 
3666  out:
3667         dev_kfree_skb(skb);
3668 }
3669 
3670 /*
3671  * This is the receive path handler. It is called by a low level driver when an
3672  * 802.11 MPDU is received from the hardware.
3673  */
3674 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3675                        struct napi_struct *napi)
3676 {
3677         struct ieee80211_local *local = hw_to_local(hw);
3678         struct ieee80211_rate *rate = NULL;
3679         struct ieee80211_supported_band *sband;
3680         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3681 
3682         WARN_ON_ONCE(softirq_count() == 0);
3683 
3684         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3685                 goto drop;
3686 
3687         sband = local->hw.wiphy->bands[status->band];
3688         if (WARN_ON(!sband))
3689                 goto drop;
3690 
3691         /*
3692          * If we're suspending, it is possible although not too likely
3693          * that we'd be receiving frames after having already partially
3694          * quiesced the stack. We can't process such frames then since
3695          * that might, for example, cause stations to be added or other
3696          * driver callbacks be invoked.
3697          */
3698         if (unlikely(local->quiescing || local->suspended))
3699                 goto drop;
3700 
3701         /* We might be during a HW reconfig, prevent Rx for the same reason */
3702         if (unlikely(local->in_reconfig))
3703                 goto drop;
3704 
3705         /*
3706          * The same happens when we're not even started,
3707          * but that's worth a warning.
3708          */
3709         if (WARN_ON(!local->started))
3710                 goto drop;
3711 
3712         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3713                 /*
3714                  * Validate the rate, unless a PLCP error means that
3715                  * we probably can't have a valid rate here anyway.
3716                  */
3717 
3718                 if (status->flag & RX_FLAG_HT) {
3719                         /*
3720                          * rate_idx is MCS index, which can be [0-76]
3721                          * as documented on:
3722                          *
3723                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3724                          *
3725                          * Anything else would be some sort of driver or
3726                          * hardware error. The driver should catch hardware
3727                          * errors.
3728                          */
3729                         if (WARN(status->rate_idx > 76,
3730                                  "Rate marked as an HT rate but passed "
3731                                  "status->rate_idx is not "
3732                                  "an MCS index [0-76]: %d (0x%02x)\n",
3733                                  status->rate_idx,
3734                                  status->rate_idx))
3735                                 goto drop;
3736                 } else if (status->flag & RX_FLAG_VHT) {
3737                         if (WARN_ONCE(status->rate_idx > 9 ||
3738                                       !status->vht_nss ||
3739                                       status->vht_nss > 8,
3740                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3741                                       status->rate_idx, status->vht_nss))
3742                                 goto drop;
3743                 } else {
3744                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3745                                 goto drop;
3746                         rate = &sband->bitrates[status->rate_idx];
3747                 }
3748         }
3749 
3750         status->rx_flags = 0;
3751 
3752         /*
3753          * key references and virtual interfaces are protected using RCU
3754          * and this requires that we are in a read-side RCU section during
3755          * receive processing
3756          */
3757         rcu_read_lock();
3758 
3759         /*
3760          * Frames with failed FCS/PLCP checksum are not returned,
3761          * all other frames are returned without radiotap header
3762          * if it was previously present.
3763          * Also, frames with less than 16 bytes are dropped.
3764          */
3765         skb = ieee80211_rx_monitor(local, skb, rate);
3766         if (!skb) {
3767                 rcu_read_unlock();
3768                 return;
3769         }
3770 
3771         ieee80211_tpt_led_trig_rx(local,
3772                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3773                         skb->len);
3774         __ieee80211_rx_handle_packet(hw, skb, napi);
3775 
3776         rcu_read_unlock();
3777 
3778         return;
3779  drop:
3780         kfree_skb(skb);
3781 }
3782 EXPORT_SYMBOL(ieee80211_rx_napi);
3783 
3784 /* This is a version of the rx handler that can be called from hard irq
3785  * context. Post the skb on the queue and schedule the tasklet */
3786 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3787 {
3788         struct ieee80211_local *local = hw_to_local(hw);
3789 
3790         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3791 
3792         skb->pkt_type = IEEE80211_RX_MSG;
3793         skb_queue_tail(&local->skb_queue, skb);
3794         tasklet_schedule(&local->tasklet);
3795 }
3796 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
3797 

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