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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  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 12 #include <linux/jiffies.h>
 13 #include <linux/slab.h>
 14 #include <linux/kernel.h>
 15 #include <linux/skbuff.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/etherdevice.h>
 18 #include <linux/rcupdate.h>
 19 #include <linux/export.h>
 20 #include <net/mac80211.h>
 21 #include <net/ieee80211_radiotap.h>
 22 #include <asm/unaligned.h>
 23 
 24 #include "ieee80211_i.h"
 25 #include "driver-ops.h"
 26 #include "led.h"
 27 #include "mesh.h"
 28 #include "wep.h"
 29 #include "wpa.h"
 30 #include "tkip.h"
 31 #include "wme.h"
 32 #include "rate.h"
 33 
 34 /*
 35  * monitor mode reception
 36  *
 37  * This function cleans up the SKB, i.e. it removes all the stuff
 38  * only useful for monitoring.
 39  */
 40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
 41                                            struct sk_buff *skb)
 42 {
 43         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 44 
 45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
 46                 if (likely(skb->len > FCS_LEN))
 47                         __pskb_trim(skb, skb->len - FCS_LEN);
 48                 else {
 49                         /* driver bug */
 50                         WARN_ON(1);
 51                         dev_kfree_skb(skb);
 52                         return NULL;
 53                 }
 54         }
 55 
 56         if (status->vendor_radiotap_len)
 57                 __pskb_pull(skb, status->vendor_radiotap_len);
 58 
 59         return skb;
 60 }
 61 
 62 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
 63 {
 64         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 65         struct ieee80211_hdr *hdr;
 66 
 67         hdr = (void *)(skb->data + status->vendor_radiotap_len);
 68 
 69         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 70                             RX_FLAG_FAILED_PLCP_CRC |
 71                             RX_FLAG_AMPDU_IS_ZEROLEN))
 72                 return 1;
 73         if (unlikely(skb->len < 16 + present_fcs_len +
 74                                 status->vendor_radiotap_len))
 75                 return 1;
 76         if (ieee80211_is_ctl(hdr->frame_control) &&
 77             !ieee80211_is_pspoll(hdr->frame_control) &&
 78             !ieee80211_is_back_req(hdr->frame_control))
 79                 return 1;
 80         return 0;
 81 }
 82 
 83 static int
 84 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
 85                             struct ieee80211_rx_status *status)
 86 {
 87         int len;
 88 
 89         /* always present fields */
 90         len = sizeof(struct ieee80211_radiotap_header) + 8;
 91 
 92         /* allocate extra bitmaps */
 93         if (status->vendor_radiotap_len)
 94                 len += 4;
 95         if (status->chains)
 96                 len += 4 * hweight8(status->chains);
 97 
 98         if (ieee80211_have_rx_timestamp(status)) {
 99                 len = ALIGN(len, 8);
100                 len += 8;
101         }
102         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
103                 len += 1;
104 
105         /* antenna field, if we don't have per-chain info */
106         if (!status->chains)
107                 len += 1;
108 
109         /* padding for RX_FLAGS if necessary */
110         len = ALIGN(len, 2);
111 
112         if (status->flag & RX_FLAG_HT) /* HT info */
113                 len += 3;
114 
115         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
116                 len = ALIGN(len, 4);
117                 len += 8;
118         }
119 
120         if (status->flag & RX_FLAG_VHT) {
121                 len = ALIGN(len, 2);
122                 len += 12;
123         }
124 
125         if (status->chains) {
126                 /* antenna and antenna signal fields */
127                 len += 2 * hweight8(status->chains);
128         }
129 
130         if (status->vendor_radiotap_len) {
131                 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
132                         status->vendor_radiotap_align = 1;
133                 /* align standard part of vendor namespace */
134                 len = ALIGN(len, 2);
135                 /* allocate standard part of vendor namespace */
136                 len += 6;
137                 /* align vendor-defined part */
138                 len = ALIGN(len, status->vendor_radiotap_align);
139                 /* vendor-defined part is already in skb */
140         }
141 
142         return len;
143 }
144 
145 /*
146  * ieee80211_add_rx_radiotap_header - add radiotap header
147  *
148  * add a radiotap header containing all the fields which the hardware provided.
149  */
150 static void
151 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
152                                  struct sk_buff *skb,
153                                  struct ieee80211_rate *rate,
154                                  int rtap_len, bool has_fcs)
155 {
156         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
157         struct ieee80211_radiotap_header *rthdr;
158         unsigned char *pos;
159         __le32 *it_present;
160         u32 it_present_val;
161         u16 rx_flags = 0;
162         u16 channel_flags = 0;
163         int mpdulen, chain;
164         unsigned long chains = status->chains;
165 
166         mpdulen = skb->len;
167         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
168                 mpdulen += FCS_LEN;
169 
170         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
171         memset(rthdr, 0, rtap_len);
172         it_present = &rthdr->it_present;
173 
174         /* radiotap header, set always present flags */
175         rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
176         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
177                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
178                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
179 
180         if (!status->chains)
181                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
182 
183         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
184                 it_present_val |=
185                         BIT(IEEE80211_RADIOTAP_EXT) |
186                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
187                 put_unaligned_le32(it_present_val, it_present);
188                 it_present++;
189                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
190                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
191         }
192 
193         if (status->vendor_radiotap_len) {
194                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
195                                   BIT(IEEE80211_RADIOTAP_EXT);
196                 put_unaligned_le32(it_present_val, it_present);
197                 it_present++;
198                 it_present_val = status->vendor_radiotap_bitmap;
199         }
200 
201         put_unaligned_le32(it_present_val, it_present);
202 
203         pos = (void *)(it_present + 1);
204 
205         /* the order of the following fields is important */
206 
207         /* IEEE80211_RADIOTAP_TSFT */
208         if (ieee80211_have_rx_timestamp(status)) {
209                 /* padding */
210                 while ((pos - (u8 *)rthdr) & 7)
211                         *pos++ = 0;
212                 put_unaligned_le64(
213                         ieee80211_calculate_rx_timestamp(local, status,
214                                                          mpdulen, 0),
215                         pos);
216                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
217                 pos += 8;
218         }
219 
220         /* IEEE80211_RADIOTAP_FLAGS */
221         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
222                 *pos |= IEEE80211_RADIOTAP_F_FCS;
223         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
224                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
225         if (status->flag & RX_FLAG_SHORTPRE)
226                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
227         pos++;
228 
229         /* IEEE80211_RADIOTAP_RATE */
230         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
231                 /*
232                  * Without rate information don't add it. If we have,
233                  * MCS information is a separate field in radiotap,
234                  * added below. The byte here is needed as padding
235                  * for the channel though, so initialise it to 0.
236                  */
237                 *pos = 0;
238         } else {
239                 int shift = 0;
240                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
241                 if (status->flag & RX_FLAG_10MHZ)
242                         shift = 1;
243                 else if (status->flag & RX_FLAG_5MHZ)
244                         shift = 2;
245                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
246         }
247         pos++;
248 
249         /* IEEE80211_RADIOTAP_CHANNEL */
250         put_unaligned_le16(status->freq, pos);
251         pos += 2;
252         if (status->flag & RX_FLAG_10MHZ)
253                 channel_flags |= IEEE80211_CHAN_HALF;
254         else if (status->flag & RX_FLAG_5MHZ)
255                 channel_flags |= IEEE80211_CHAN_QUARTER;
256 
257         if (status->band == IEEE80211_BAND_5GHZ)
258                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
259         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
260                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
261         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
262                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
263         else if (rate)
264                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
265         else
266                 channel_flags |= IEEE80211_CHAN_2GHZ;
267         put_unaligned_le16(channel_flags, pos);
268         pos += 2;
269 
270         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
271         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
272             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
273                 *pos = status->signal;
274                 rthdr->it_present |=
275                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
276                 pos++;
277         }
278 
279         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
280 
281         if (!status->chains) {
282                 /* IEEE80211_RADIOTAP_ANTENNA */
283                 *pos = status->antenna;
284                 pos++;
285         }
286 
287         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
288 
289         /* IEEE80211_RADIOTAP_RX_FLAGS */
290         /* ensure 2 byte alignment for the 2 byte field as required */
291         if ((pos - (u8 *)rthdr) & 1)
292                 *pos++ = 0;
293         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
294                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
295         put_unaligned_le16(rx_flags, pos);
296         pos += 2;
297 
298         if (status->flag & RX_FLAG_HT) {
299                 unsigned int stbc;
300 
301                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
302                 *pos++ = local->hw.radiotap_mcs_details;
303                 *pos = 0;
304                 if (status->flag & RX_FLAG_SHORT_GI)
305                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
306                 if (status->flag & RX_FLAG_40MHZ)
307                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
308                 if (status->flag & RX_FLAG_HT_GF)
309                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
310                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
311                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
312                 pos++;
313                 *pos++ = status->rate_idx;
314         }
315 
316         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
317                 u16 flags = 0;
318 
319                 /* ensure 4 byte alignment */
320                 while ((pos - (u8 *)rthdr) & 3)
321                         pos++;
322                 rthdr->it_present |=
323                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
324                 put_unaligned_le32(status->ampdu_reference, pos);
325                 pos += 4;
326                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
327                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
328                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
329                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
330                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
331                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
332                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
333                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
334                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
335                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
336                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
337                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
338                 put_unaligned_le16(flags, pos);
339                 pos += 2;
340                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
341                         *pos++ = status->ampdu_delimiter_crc;
342                 else
343                         *pos++ = 0;
344                 *pos++ = 0;
345         }
346 
347         if (status->flag & RX_FLAG_VHT) {
348                 u16 known = local->hw.radiotap_vht_details;
349 
350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
351                 /* known field - how to handle 80+80? */
352                 if (status->flag & RX_FLAG_80P80MHZ)
353                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
354                 put_unaligned_le16(known, pos);
355                 pos += 2;
356                 /* flags */
357                 if (status->flag & RX_FLAG_SHORT_GI)
358                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
359                 pos++;
360                 /* bandwidth */
361                 if (status->flag & RX_FLAG_80MHZ)
362                         *pos++ = 4;
363                 else if (status->flag & RX_FLAG_80P80MHZ)
364                         *pos++ = 0; /* marked not known above */
365                 else if (status->flag & RX_FLAG_160MHZ)
366                         *pos++ = 11;
367                 else if (status->flag & RX_FLAG_40MHZ)
368                         *pos++ = 1;
369                 else /* 20 MHz */
370                         *pos++ = 0;
371                 /* MCS/NSS */
372                 *pos = (status->rate_idx << 4) | status->vht_nss;
373                 pos += 4;
374                 /* coding field */
375                 pos++;
376                 /* group ID */
377                 pos++;
378                 /* partial_aid */
379                 pos += 2;
380         }
381 
382         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
383                 *pos++ = status->chain_signal[chain];
384                 *pos++ = chain;
385         }
386 
387         if (status->vendor_radiotap_len) {
388                 /* ensure 2 byte alignment for the vendor field as required */
389                 if ((pos - (u8 *)rthdr) & 1)
390                         *pos++ = 0;
391                 *pos++ = status->vendor_radiotap_oui[0];
392                 *pos++ = status->vendor_radiotap_oui[1];
393                 *pos++ = status->vendor_radiotap_oui[2];
394                 *pos++ = status->vendor_radiotap_subns;
395                 put_unaligned_le16(status->vendor_radiotap_len, pos);
396                 pos += 2;
397                 /* align the actual payload as requested */
398                 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
399                         *pos++ = 0;
400         }
401 }
402 
403 /*
404  * This function copies a received frame to all monitor interfaces and
405  * returns a cleaned-up SKB that no longer includes the FCS nor the
406  * radiotap header the driver might have added.
407  */
408 static struct sk_buff *
409 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
410                      struct ieee80211_rate *rate)
411 {
412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
413         struct ieee80211_sub_if_data *sdata;
414         int needed_headroom;
415         struct sk_buff *skb, *skb2;
416         struct net_device *prev_dev = NULL;
417         int present_fcs_len = 0;
418 
419         /*
420          * First, we may need to make a copy of the skb because
421          *  (1) we need to modify it for radiotap (if not present), and
422          *  (2) the other RX handlers will modify the skb we got.
423          *
424          * We don't need to, of course, if we aren't going to return
425          * the SKB because it has a bad FCS/PLCP checksum.
426          */
427 
428         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
429                 present_fcs_len = FCS_LEN;
430 
431         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
432         if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
433                 dev_kfree_skb(origskb);
434                 return NULL;
435         }
436 
437         if (!local->monitors) {
438                 if (should_drop_frame(origskb, present_fcs_len)) {
439                         dev_kfree_skb(origskb);
440                         return NULL;
441                 }
442 
443                 return remove_monitor_info(local, origskb);
444         }
445 
446         /* room for the radiotap header based on driver features */
447         needed_headroom = ieee80211_rx_radiotap_space(local, status);
448 
449         if (should_drop_frame(origskb, present_fcs_len)) {
450                 /* only need to expand headroom if necessary */
451                 skb = origskb;
452                 origskb = NULL;
453 
454                 /*
455                  * This shouldn't trigger often because most devices have an
456                  * RX header they pull before we get here, and that should
457                  * be big enough for our radiotap information. We should
458                  * probably export the length to drivers so that we can have
459                  * them allocate enough headroom to start with.
460                  */
461                 if (skb_headroom(skb) < needed_headroom &&
462                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
463                         dev_kfree_skb(skb);
464                         return NULL;
465                 }
466         } else {
467                 /*
468                  * Need to make a copy and possibly remove radiotap header
469                  * and FCS from the original.
470                  */
471                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
472 
473                 origskb = remove_monitor_info(local, origskb);
474 
475                 if (!skb)
476                         return origskb;
477         }
478 
479         /* prepend radiotap information */
480         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
481                                          true);
482 
483         skb_reset_mac_header(skb);
484         skb->ip_summed = CHECKSUM_UNNECESSARY;
485         skb->pkt_type = PACKET_OTHERHOST;
486         skb->protocol = htons(ETH_P_802_2);
487 
488         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
489                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
490                         continue;
491 
492                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
493                         continue;
494 
495                 if (!ieee80211_sdata_running(sdata))
496                         continue;
497 
498                 if (prev_dev) {
499                         skb2 = skb_clone(skb, GFP_ATOMIC);
500                         if (skb2) {
501                                 skb2->dev = prev_dev;
502                                 netif_receive_skb(skb2);
503                         }
504                 }
505 
506                 prev_dev = sdata->dev;
507                 sdata->dev->stats.rx_packets++;
508                 sdata->dev->stats.rx_bytes += skb->len;
509         }
510 
511         if (prev_dev) {
512                 skb->dev = prev_dev;
513                 netif_receive_skb(skb);
514         } else
515                 dev_kfree_skb(skb);
516 
517         return origskb;
518 }
519 
520 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
521 {
522         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
523         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
524         int tid, seqno_idx, security_idx;
525 
526         /* does the frame have a qos control field? */
527         if (ieee80211_is_data_qos(hdr->frame_control)) {
528                 u8 *qc = ieee80211_get_qos_ctl(hdr);
529                 /* frame has qos control */
530                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
531                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
532                         status->rx_flags |= IEEE80211_RX_AMSDU;
533 
534                 seqno_idx = tid;
535                 security_idx = tid;
536         } else {
537                 /*
538                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
539                  *
540                  *      Sequence numbers for management frames, QoS data
541                  *      frames with a broadcast/multicast address in the
542                  *      Address 1 field, and all non-QoS data frames sent
543                  *      by QoS STAs are assigned using an additional single
544                  *      modulo-4096 counter, [...]
545                  *
546                  * We also use that counter for non-QoS STAs.
547                  */
548                 seqno_idx = IEEE80211_NUM_TIDS;
549                 security_idx = 0;
550                 if (ieee80211_is_mgmt(hdr->frame_control))
551                         security_idx = IEEE80211_NUM_TIDS;
552                 tid = 0;
553         }
554 
555         rx->seqno_idx = seqno_idx;
556         rx->security_idx = security_idx;
557         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
558          * For now, set skb->priority to 0 for other cases. */
559         rx->skb->priority = (tid > 7) ? 0 : tid;
560 }
561 
562 /**
563  * DOC: Packet alignment
564  *
565  * Drivers always need to pass packets that are aligned to two-byte boundaries
566  * to the stack.
567  *
568  * Additionally, should, if possible, align the payload data in a way that
569  * guarantees that the contained IP header is aligned to a four-byte
570  * boundary. In the case of regular frames, this simply means aligning the
571  * payload to a four-byte boundary (because either the IP header is directly
572  * contained, or IV/RFC1042 headers that have a length divisible by four are
573  * in front of it).  If the payload data is not properly aligned and the
574  * architecture doesn't support efficient unaligned operations, mac80211
575  * will align the data.
576  *
577  * With A-MSDU frames, however, the payload data address must yield two modulo
578  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
579  * push the IP header further back to a multiple of four again. Thankfully, the
580  * specs were sane enough this time around to require padding each A-MSDU
581  * subframe to a length that is a multiple of four.
582  *
583  * Padding like Atheros hardware adds which is between the 802.11 header and
584  * the payload is not supported, the driver is required to move the 802.11
585  * header to be directly in front of the payload in that case.
586  */
587 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
588 {
589 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
590         WARN_ONCE((unsigned long)rx->skb->data & 1,
591                   "unaligned packet at 0x%p\n", rx->skb->data);
592 #endif
593 }
594 
595 
596 /* rx handlers */
597 
598 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
599 {
600         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
601 
602         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
603                 return 0;
604 
605         return ieee80211_is_robust_mgmt_frame(hdr);
606 }
607 
608 
609 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
610 {
611         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
612 
613         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
614                 return 0;
615 
616         return ieee80211_is_robust_mgmt_frame(hdr);
617 }
618 
619 
620 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
621 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
622 {
623         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
624         struct ieee80211_mmie *mmie;
625 
626         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
627                 return -1;
628 
629         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
630                 return -1; /* not a robust management frame */
631 
632         mmie = (struct ieee80211_mmie *)
633                 (skb->data + skb->len - sizeof(*mmie));
634         if (mmie->element_id != WLAN_EID_MMIE ||
635             mmie->length != sizeof(*mmie) - 2)
636                 return -1;
637 
638         return le16_to_cpu(mmie->key_id);
639 }
640 
641 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
642 {
643         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
644         char *dev_addr = rx->sdata->vif.addr;
645 
646         if (ieee80211_is_data(hdr->frame_control)) {
647                 if (is_multicast_ether_addr(hdr->addr1)) {
648                         if (ieee80211_has_tods(hdr->frame_control) ||
649                             !ieee80211_has_fromds(hdr->frame_control))
650                                 return RX_DROP_MONITOR;
651                         if (ether_addr_equal(hdr->addr3, dev_addr))
652                                 return RX_DROP_MONITOR;
653                 } else {
654                         if (!ieee80211_has_a4(hdr->frame_control))
655                                 return RX_DROP_MONITOR;
656                         if (ether_addr_equal(hdr->addr4, dev_addr))
657                                 return RX_DROP_MONITOR;
658                 }
659         }
660 
661         /* If there is not an established peer link and this is not a peer link
662          * establisment frame, beacon or probe, drop the frame.
663          */
664 
665         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
666                 struct ieee80211_mgmt *mgmt;
667 
668                 if (!ieee80211_is_mgmt(hdr->frame_control))
669                         return RX_DROP_MONITOR;
670 
671                 if (ieee80211_is_action(hdr->frame_control)) {
672                         u8 category;
673 
674                         /* make sure category field is present */
675                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
676                                 return RX_DROP_MONITOR;
677 
678                         mgmt = (struct ieee80211_mgmt *)hdr;
679                         category = mgmt->u.action.category;
680                         if (category != WLAN_CATEGORY_MESH_ACTION &&
681                             category != WLAN_CATEGORY_SELF_PROTECTED)
682                                 return RX_DROP_MONITOR;
683                         return RX_CONTINUE;
684                 }
685 
686                 if (ieee80211_is_probe_req(hdr->frame_control) ||
687                     ieee80211_is_probe_resp(hdr->frame_control) ||
688                     ieee80211_is_beacon(hdr->frame_control) ||
689                     ieee80211_is_auth(hdr->frame_control))
690                         return RX_CONTINUE;
691 
692                 return RX_DROP_MONITOR;
693         }
694 
695         return RX_CONTINUE;
696 }
697 
698 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
699                                             struct tid_ampdu_rx *tid_agg_rx,
700                                             int index,
701                                             struct sk_buff_head *frames)
702 {
703         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
704         struct ieee80211_rx_status *status;
705 
706         lockdep_assert_held(&tid_agg_rx->reorder_lock);
707 
708         if (!skb)
709                 goto no_frame;
710 
711         /* release the frame from the reorder ring buffer */
712         tid_agg_rx->stored_mpdu_num--;
713         tid_agg_rx->reorder_buf[index] = NULL;
714         status = IEEE80211_SKB_RXCB(skb);
715         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
716         __skb_queue_tail(frames, skb);
717 
718 no_frame:
719         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
720 }
721 
722 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
723                                              struct tid_ampdu_rx *tid_agg_rx,
724                                              u16 head_seq_num,
725                                              struct sk_buff_head *frames)
726 {
727         int index;
728 
729         lockdep_assert_held(&tid_agg_rx->reorder_lock);
730 
731         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
732                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
733                                          tid_agg_rx->ssn) %
734                                                         tid_agg_rx->buf_size;
735                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
736                                                 frames);
737         }
738 }
739 
740 /*
741  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
742  * the skb was added to the buffer longer than this time ago, the earlier
743  * frames that have not yet been received are assumed to be lost and the skb
744  * can be released for processing. This may also release other skb's from the
745  * reorder buffer if there are no additional gaps between the frames.
746  *
747  * Callers must hold tid_agg_rx->reorder_lock.
748  */
749 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
750 
751 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
752                                           struct tid_ampdu_rx *tid_agg_rx,
753                                           struct sk_buff_head *frames)
754 {
755         int index, j;
756 
757         lockdep_assert_held(&tid_agg_rx->reorder_lock);
758 
759         /* release the buffer until next missing frame */
760         index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
761                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
762         if (!tid_agg_rx->reorder_buf[index] &&
763             tid_agg_rx->stored_mpdu_num) {
764                 /*
765                  * No buffers ready to be released, but check whether any
766                  * frames in the reorder buffer have timed out.
767                  */
768                 int skipped = 1;
769                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
770                      j = (j + 1) % tid_agg_rx->buf_size) {
771                         if (!tid_agg_rx->reorder_buf[j]) {
772                                 skipped++;
773                                 continue;
774                         }
775                         if (skipped &&
776                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
777                                         HT_RX_REORDER_BUF_TIMEOUT))
778                                 goto set_release_timer;
779 
780                         ht_dbg_ratelimited(sdata,
781                                            "release an RX reorder frame due to timeout on earlier frames\n");
782                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
783                                                         frames);
784 
785                         /*
786                          * Increment the head seq# also for the skipped slots.
787                          */
788                         tid_agg_rx->head_seq_num =
789                                 (tid_agg_rx->head_seq_num +
790                                  skipped) & IEEE80211_SN_MASK;
791                         skipped = 0;
792                 }
793         } else while (tid_agg_rx->reorder_buf[index]) {
794                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
795                                                 frames);
796                 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
797                                          tid_agg_rx->ssn) %
798                                                         tid_agg_rx->buf_size;
799         }
800 
801         if (tid_agg_rx->stored_mpdu_num) {
802                 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
803                                              tid_agg_rx->ssn) %
804                                                         tid_agg_rx->buf_size;
805 
806                 for (; j != (index - 1) % tid_agg_rx->buf_size;
807                      j = (j + 1) % tid_agg_rx->buf_size) {
808                         if (tid_agg_rx->reorder_buf[j])
809                                 break;
810                 }
811 
812  set_release_timer:
813 
814                 mod_timer(&tid_agg_rx->reorder_timer,
815                           tid_agg_rx->reorder_time[j] + 1 +
816                           HT_RX_REORDER_BUF_TIMEOUT);
817         } else {
818                 del_timer(&tid_agg_rx->reorder_timer);
819         }
820 }
821 
822 /*
823  * As this function belongs to the RX path it must be under
824  * rcu_read_lock protection. It returns false if the frame
825  * can be processed immediately, true if it was consumed.
826  */
827 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
828                                              struct tid_ampdu_rx *tid_agg_rx,
829                                              struct sk_buff *skb,
830                                              struct sk_buff_head *frames)
831 {
832         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
833         u16 sc = le16_to_cpu(hdr->seq_ctrl);
834         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
835         u16 head_seq_num, buf_size;
836         int index;
837         bool ret = true;
838 
839         spin_lock(&tid_agg_rx->reorder_lock);
840 
841         buf_size = tid_agg_rx->buf_size;
842         head_seq_num = tid_agg_rx->head_seq_num;
843 
844         /* frame with out of date sequence number */
845         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
846                 dev_kfree_skb(skb);
847                 goto out;
848         }
849 
850         /*
851          * If frame the sequence number exceeds our buffering window
852          * size release some previous frames to make room for this one.
853          */
854         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
855                 head_seq_num = ieee80211_sn_inc(
856                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
857                 /* release stored frames up to new head to stack */
858                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
859                                                  head_seq_num, frames);
860         }
861 
862         /* Now the new frame is always in the range of the reordering buffer */
863 
864         index = ieee80211_sn_sub(mpdu_seq_num,
865                                  tid_agg_rx->ssn) % tid_agg_rx->buf_size;
866 
867         /* check if we already stored this frame */
868         if (tid_agg_rx->reorder_buf[index]) {
869                 dev_kfree_skb(skb);
870                 goto out;
871         }
872 
873         /*
874          * If the current MPDU is in the right order and nothing else
875          * is stored we can process it directly, no need to buffer it.
876          * If it is first but there's something stored, we may be able
877          * to release frames after this one.
878          */
879         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
880             tid_agg_rx->stored_mpdu_num == 0) {
881                 tid_agg_rx->head_seq_num =
882                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
883                 ret = false;
884                 goto out;
885         }
886 
887         /* put the frame in the reordering buffer */
888         tid_agg_rx->reorder_buf[index] = skb;
889         tid_agg_rx->reorder_time[index] = jiffies;
890         tid_agg_rx->stored_mpdu_num++;
891         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
892 
893  out:
894         spin_unlock(&tid_agg_rx->reorder_lock);
895         return ret;
896 }
897 
898 /*
899  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
900  * true if the MPDU was buffered, false if it should be processed.
901  */
902 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
903                                        struct sk_buff_head *frames)
904 {
905         struct sk_buff *skb = rx->skb;
906         struct ieee80211_local *local = rx->local;
907         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
908         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
909         struct sta_info *sta = rx->sta;
910         struct tid_ampdu_rx *tid_agg_rx;
911         u16 sc;
912         u8 tid, ack_policy;
913 
914         if (!ieee80211_is_data_qos(hdr->frame_control) ||
915             is_multicast_ether_addr(hdr->addr1))
916                 goto dont_reorder;
917 
918         /*
919          * filter the QoS data rx stream according to
920          * STA/TID and check if this STA/TID is on aggregation
921          */
922 
923         if (!sta)
924                 goto dont_reorder;
925 
926         ack_policy = *ieee80211_get_qos_ctl(hdr) &
927                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
928         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
929 
930         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
931         if (!tid_agg_rx)
932                 goto dont_reorder;
933 
934         /* qos null data frames are excluded */
935         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
936                 goto dont_reorder;
937 
938         /* not part of a BA session */
939         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
940             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
941                 goto dont_reorder;
942 
943         /* not actually part of this BA session */
944         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
945                 goto dont_reorder;
946 
947         /* new, potentially un-ordered, ampdu frame - process it */
948 
949         /* reset session timer */
950         if (tid_agg_rx->timeout)
951                 tid_agg_rx->last_rx = jiffies;
952 
953         /* if this mpdu is fragmented - terminate rx aggregation session */
954         sc = le16_to_cpu(hdr->seq_ctrl);
955         if (sc & IEEE80211_SCTL_FRAG) {
956                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
957                 skb_queue_tail(&rx->sdata->skb_queue, skb);
958                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
959                 return;
960         }
961 
962         /*
963          * No locking needed -- we will only ever process one
964          * RX packet at a time, and thus own tid_agg_rx. All
965          * other code manipulating it needs to (and does) make
966          * sure that we cannot get to it any more before doing
967          * anything with it.
968          */
969         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
970                                              frames))
971                 return;
972 
973  dont_reorder:
974         __skb_queue_tail(frames, skb);
975 }
976 
977 static ieee80211_rx_result debug_noinline
978 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
979 {
980         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
981         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
982 
983         /*
984          * Drop duplicate 802.11 retransmissions
985          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
986          */
987         if (rx->skb->len >= 24 && rx->sta &&
988             !ieee80211_is_ctl(hdr->frame_control) &&
989             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
990             !is_multicast_ether_addr(hdr->addr1)) {
991                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
992                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
993                              hdr->seq_ctrl)) {
994                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
995                                 rx->local->dot11FrameDuplicateCount++;
996                                 rx->sta->num_duplicates++;
997                         }
998                         return RX_DROP_UNUSABLE;
999                 } else
1000                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1001         }
1002 
1003         if (unlikely(rx->skb->len < 16)) {
1004                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1005                 return RX_DROP_MONITOR;
1006         }
1007 
1008         /* Drop disallowed frame classes based on STA auth/assoc state;
1009          * IEEE 802.11, Chap 5.5.
1010          *
1011          * mac80211 filters only based on association state, i.e. it drops
1012          * Class 3 frames from not associated stations. hostapd sends
1013          * deauth/disassoc frames when needed. In addition, hostapd is
1014          * responsible for filtering on both auth and assoc states.
1015          */
1016 
1017         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1018                 return ieee80211_rx_mesh_check(rx);
1019 
1020         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1021                       ieee80211_is_pspoll(hdr->frame_control)) &&
1022                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1023                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1024                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1025                 /*
1026                  * accept port control frames from the AP even when it's not
1027                  * yet marked ASSOC to prevent a race where we don't set the
1028                  * assoc bit quickly enough before it sends the first frame
1029                  */
1030                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1031                     ieee80211_is_data_present(hdr->frame_control)) {
1032                         unsigned int hdrlen;
1033                         __be16 ethertype;
1034 
1035                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1036 
1037                         if (rx->skb->len < hdrlen + 8)
1038                                 return RX_DROP_MONITOR;
1039 
1040                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1041                         if (ethertype == rx->sdata->control_port_protocol)
1042                                 return RX_CONTINUE;
1043                 }
1044 
1045                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1046                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1047                                                hdr->addr2,
1048                                                GFP_ATOMIC))
1049                         return RX_DROP_UNUSABLE;
1050 
1051                 return RX_DROP_MONITOR;
1052         }
1053 
1054         return RX_CONTINUE;
1055 }
1056 
1057 
1058 static ieee80211_rx_result debug_noinline
1059 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1060 {
1061         struct ieee80211_local *local;
1062         struct ieee80211_hdr *hdr;
1063         struct sk_buff *skb;
1064 
1065         local = rx->local;
1066         skb = rx->skb;
1067         hdr = (struct ieee80211_hdr *) skb->data;
1068 
1069         if (!local->pspolling)
1070                 return RX_CONTINUE;
1071 
1072         if (!ieee80211_has_fromds(hdr->frame_control))
1073                 /* this is not from AP */
1074                 return RX_CONTINUE;
1075 
1076         if (!ieee80211_is_data(hdr->frame_control))
1077                 return RX_CONTINUE;
1078 
1079         if (!ieee80211_has_moredata(hdr->frame_control)) {
1080                 /* AP has no more frames buffered for us */
1081                 local->pspolling = false;
1082                 return RX_CONTINUE;
1083         }
1084 
1085         /* more data bit is set, let's request a new frame from the AP */
1086         ieee80211_send_pspoll(local, rx->sdata);
1087 
1088         return RX_CONTINUE;
1089 }
1090 
1091 static void sta_ps_start(struct sta_info *sta)
1092 {
1093         struct ieee80211_sub_if_data *sdata = sta->sdata;
1094         struct ieee80211_local *local = sdata->local;
1095         struct ps_data *ps;
1096 
1097         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1098             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1099                 ps = &sdata->bss->ps;
1100         else
1101                 return;
1102 
1103         atomic_inc(&ps->num_sta_ps);
1104         set_sta_flag(sta, WLAN_STA_PS_STA);
1105         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1106                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1107         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1108                sta->sta.addr, sta->sta.aid);
1109 }
1110 
1111 static void sta_ps_end(struct sta_info *sta)
1112 {
1113         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1114                sta->sta.addr, sta->sta.aid);
1115 
1116         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1117                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1118                        sta->sta.addr, sta->sta.aid);
1119                 return;
1120         }
1121 
1122         ieee80211_sta_ps_deliver_wakeup(sta);
1123 }
1124 
1125 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1126 {
1127         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1128         bool in_ps;
1129 
1130         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1131 
1132         /* Don't let the same PS state be set twice */
1133         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1134         if ((start && in_ps) || (!start && !in_ps))
1135                 return -EINVAL;
1136 
1137         if (start)
1138                 sta_ps_start(sta_inf);
1139         else
1140                 sta_ps_end(sta_inf);
1141 
1142         return 0;
1143 }
1144 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1145 
1146 static ieee80211_rx_result debug_noinline
1147 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1148 {
1149         struct ieee80211_sub_if_data *sdata = rx->sdata;
1150         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1151         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1152         int tid, ac;
1153 
1154         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1155                 return RX_CONTINUE;
1156 
1157         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1158             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1159                 return RX_CONTINUE;
1160 
1161         /*
1162          * The device handles station powersave, so don't do anything about
1163          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1164          * it to mac80211 since they're handled.)
1165          */
1166         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1167                 return RX_CONTINUE;
1168 
1169         /*
1170          * Don't do anything if the station isn't already asleep. In
1171          * the uAPSD case, the station will probably be marked asleep,
1172          * in the PS-Poll case the station must be confused ...
1173          */
1174         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1175                 return RX_CONTINUE;
1176 
1177         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1178                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1179                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1180                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1181                         else
1182                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1183                 }
1184 
1185                 /* Free PS Poll skb here instead of returning RX_DROP that would
1186                  * count as an dropped frame. */
1187                 dev_kfree_skb(rx->skb);
1188 
1189                 return RX_QUEUED;
1190         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1191                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1192                    ieee80211_has_pm(hdr->frame_control) &&
1193                    (ieee80211_is_data_qos(hdr->frame_control) ||
1194                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1195                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1196                 ac = ieee802_1d_to_ac[tid & 7];
1197 
1198                 /*
1199                  * If this AC is not trigger-enabled do nothing.
1200                  *
1201                  * NB: This could/should check a separate bitmap of trigger-
1202                  * enabled queues, but for now we only implement uAPSD w/o
1203                  * TSPEC changes to the ACs, so they're always the same.
1204                  */
1205                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1206                         return RX_CONTINUE;
1207 
1208                 /* if we are in a service period, do nothing */
1209                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1210                         return RX_CONTINUE;
1211 
1212                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1213                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1214                 else
1215                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1216         }
1217 
1218         return RX_CONTINUE;
1219 }
1220 
1221 static ieee80211_rx_result debug_noinline
1222 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1223 {
1224         struct sta_info *sta = rx->sta;
1225         struct sk_buff *skb = rx->skb;
1226         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1227         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1228         int i;
1229 
1230         if (!sta)
1231                 return RX_CONTINUE;
1232 
1233         /*
1234          * Update last_rx only for IBSS packets which are for the current
1235          * BSSID and for station already AUTHORIZED to avoid keeping the
1236          * current IBSS network alive in cases where other STAs start
1237          * using different BSSID. This will also give the station another
1238          * chance to restart the authentication/authorization in case
1239          * something went wrong the first time.
1240          */
1241         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1242                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1243                                                 NL80211_IFTYPE_ADHOC);
1244                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1245                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1246                         sta->last_rx = jiffies;
1247                         if (ieee80211_is_data(hdr->frame_control)) {
1248                                 sta->last_rx_rate_idx = status->rate_idx;
1249                                 sta->last_rx_rate_flag = status->flag;
1250                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1251                         }
1252                 }
1253         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1254                 /*
1255                  * Mesh beacons will update last_rx when if they are found to
1256                  * match the current local configuration when processed.
1257                  */
1258                 sta->last_rx = jiffies;
1259                 if (ieee80211_is_data(hdr->frame_control)) {
1260                         sta->last_rx_rate_idx = status->rate_idx;
1261                         sta->last_rx_rate_flag = status->flag;
1262                         sta->last_rx_rate_vht_nss = status->vht_nss;
1263                 }
1264         }
1265 
1266         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1267                 return RX_CONTINUE;
1268 
1269         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1270                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1271 
1272         sta->rx_fragments++;
1273         sta->rx_bytes += rx->skb->len;
1274         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1275                 sta->last_signal = status->signal;
1276                 ewma_add(&sta->avg_signal, -status->signal);
1277         }
1278 
1279         if (status->chains) {
1280                 sta->chains = status->chains;
1281                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1282                         int signal = status->chain_signal[i];
1283 
1284                         if (!(status->chains & BIT(i)))
1285                                 continue;
1286 
1287                         sta->chain_signal_last[i] = signal;
1288                         ewma_add(&sta->chain_signal_avg[i], -signal);
1289                 }
1290         }
1291 
1292         /*
1293          * Change STA power saving mode only at the end of a frame
1294          * exchange sequence.
1295          */
1296         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1297             !ieee80211_has_morefrags(hdr->frame_control) &&
1298             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1299             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1300              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1301                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1302                         /*
1303                          * Ignore doze->wake transitions that are
1304                          * indicated by non-data frames, the standard
1305                          * is unclear here, but for example going to
1306                          * PS mode and then scanning would cause a
1307                          * doze->wake transition for the probe request,
1308                          * and that is clearly undesirable.
1309                          */
1310                         if (ieee80211_is_data(hdr->frame_control) &&
1311                             !ieee80211_has_pm(hdr->frame_control))
1312                                 sta_ps_end(sta);
1313                 } else {
1314                         if (ieee80211_has_pm(hdr->frame_control))
1315                                 sta_ps_start(sta);
1316                 }
1317         }
1318 
1319         /* mesh power save support */
1320         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1321                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1322 
1323         /*
1324          * Drop (qos-)data::nullfunc frames silently, since they
1325          * are used only to control station power saving mode.
1326          */
1327         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1328             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1329                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1330 
1331                 /*
1332                  * If we receive a 4-addr nullfunc frame from a STA
1333                  * that was not moved to a 4-addr STA vlan yet send
1334                  * the event to userspace and for older hostapd drop
1335                  * the frame to the monitor interface.
1336                  */
1337                 if (ieee80211_has_a4(hdr->frame_control) &&
1338                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1339                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1340                       !rx->sdata->u.vlan.sta))) {
1341                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1342                                 cfg80211_rx_unexpected_4addr_frame(
1343                                         rx->sdata->dev, sta->sta.addr,
1344                                         GFP_ATOMIC);
1345                         return RX_DROP_MONITOR;
1346                 }
1347                 /*
1348                  * Update counter and free packet here to avoid
1349                  * counting this as a dropped packed.
1350                  */
1351                 sta->rx_packets++;
1352                 dev_kfree_skb(rx->skb);
1353                 return RX_QUEUED;
1354         }
1355 
1356         return RX_CONTINUE;
1357 } /* ieee80211_rx_h_sta_process */
1358 
1359 static ieee80211_rx_result debug_noinline
1360 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1361 {
1362         struct sk_buff *skb = rx->skb;
1363         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1364         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1365         int keyidx;
1366         int hdrlen;
1367         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1368         struct ieee80211_key *sta_ptk = NULL;
1369         int mmie_keyidx = -1;
1370         __le16 fc;
1371 
1372         /*
1373          * Key selection 101
1374          *
1375          * There are four types of keys:
1376          *  - GTK (group keys)
1377          *  - IGTK (group keys for management frames)
1378          *  - PTK (pairwise keys)
1379          *  - STK (station-to-station pairwise keys)
1380          *
1381          * When selecting a key, we have to distinguish between multicast
1382          * (including broadcast) and unicast frames, the latter can only
1383          * use PTKs and STKs while the former always use GTKs and IGTKs.
1384          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1385          * unicast frames can also use key indices like GTKs. Hence, if we
1386          * don't have a PTK/STK we check the key index for a WEP key.
1387          *
1388          * Note that in a regular BSS, multicast frames are sent by the
1389          * AP only, associated stations unicast the frame to the AP first
1390          * which then multicasts it on their behalf.
1391          *
1392          * There is also a slight problem in IBSS mode: GTKs are negotiated
1393          * with each station, that is something we don't currently handle.
1394          * The spec seems to expect that one negotiates the same key with
1395          * every station but there's no such requirement; VLANs could be
1396          * possible.
1397          */
1398 
1399         /*
1400          * No point in finding a key and decrypting if the frame is neither
1401          * addressed to us nor a multicast frame.
1402          */
1403         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1404                 return RX_CONTINUE;
1405 
1406         /* start without a key */
1407         rx->key = NULL;
1408 
1409         if (rx->sta)
1410                 sta_ptk = rcu_dereference(rx->sta->ptk);
1411 
1412         fc = hdr->frame_control;
1413 
1414         if (!ieee80211_has_protected(fc))
1415                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1416 
1417         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1418                 rx->key = sta_ptk;
1419                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1420                     (status->flag & RX_FLAG_IV_STRIPPED))
1421                         return RX_CONTINUE;
1422                 /* Skip decryption if the frame is not protected. */
1423                 if (!ieee80211_has_protected(fc))
1424                         return RX_CONTINUE;
1425         } else if (mmie_keyidx >= 0) {
1426                 /* Broadcast/multicast robust management frame / BIP */
1427                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1428                     (status->flag & RX_FLAG_IV_STRIPPED))
1429                         return RX_CONTINUE;
1430 
1431                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1432                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1433                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1434                 if (rx->sta)
1435                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1436                 if (!rx->key)
1437                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1438         } else if (!ieee80211_has_protected(fc)) {
1439                 /*
1440                  * The frame was not protected, so skip decryption. However, we
1441                  * need to set rx->key if there is a key that could have been
1442                  * used so that the frame may be dropped if encryption would
1443                  * have been expected.
1444                  */
1445                 struct ieee80211_key *key = NULL;
1446                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1447                 int i;
1448 
1449                 if (ieee80211_is_mgmt(fc) &&
1450                     is_multicast_ether_addr(hdr->addr1) &&
1451                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1452                         rx->key = key;
1453                 else {
1454                         if (rx->sta) {
1455                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1456                                         key = rcu_dereference(rx->sta->gtk[i]);
1457                                         if (key)
1458                                                 break;
1459                                 }
1460                         }
1461                         if (!key) {
1462                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1463                                         key = rcu_dereference(sdata->keys[i]);
1464                                         if (key)
1465                                                 break;
1466                                 }
1467                         }
1468                         if (key)
1469                                 rx->key = key;
1470                 }
1471                 return RX_CONTINUE;
1472         } else {
1473                 u8 keyid;
1474                 /*
1475                  * The device doesn't give us the IV so we won't be
1476                  * able to look up the key. That's ok though, we
1477                  * don't need to decrypt the frame, we just won't
1478                  * be able to keep statistics accurate.
1479                  * Except for key threshold notifications, should
1480                  * we somehow allow the driver to tell us which key
1481                  * the hardware used if this flag is set?
1482                  */
1483                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1484                     (status->flag & RX_FLAG_IV_STRIPPED))
1485                         return RX_CONTINUE;
1486 
1487                 hdrlen = ieee80211_hdrlen(fc);
1488 
1489                 if (rx->skb->len < 8 + hdrlen)
1490                         return RX_DROP_UNUSABLE; /* TODO: count this? */
1491 
1492                 /*
1493                  * no need to call ieee80211_wep_get_keyidx,
1494                  * it verifies a bunch of things we've done already
1495                  */
1496                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1497                 keyidx = keyid >> 6;
1498 
1499                 /* check per-station GTK first, if multicast packet */
1500                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1501                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1502 
1503                 /* if not found, try default key */
1504                 if (!rx->key) {
1505                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1506 
1507                         /*
1508                          * RSNA-protected unicast frames should always be
1509                          * sent with pairwise or station-to-station keys,
1510                          * but for WEP we allow using a key index as well.
1511                          */
1512                         if (rx->key &&
1513                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1514                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1515                             !is_multicast_ether_addr(hdr->addr1))
1516                                 rx->key = NULL;
1517                 }
1518         }
1519 
1520         if (rx->key) {
1521                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1522                         return RX_DROP_MONITOR;
1523 
1524                 rx->key->tx_rx_count++;
1525                 /* TODO: add threshold stuff again */
1526         } else {
1527                 return RX_DROP_MONITOR;
1528         }
1529 
1530         switch (rx->key->conf.cipher) {
1531         case WLAN_CIPHER_SUITE_WEP40:
1532         case WLAN_CIPHER_SUITE_WEP104:
1533                 result = ieee80211_crypto_wep_decrypt(rx);
1534                 break;
1535         case WLAN_CIPHER_SUITE_TKIP:
1536                 result = ieee80211_crypto_tkip_decrypt(rx);
1537                 break;
1538         case WLAN_CIPHER_SUITE_CCMP:
1539                 result = ieee80211_crypto_ccmp_decrypt(rx);
1540                 break;
1541         case WLAN_CIPHER_SUITE_AES_CMAC:
1542                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1543                 break;
1544         default:
1545                 /*
1546                  * We can reach here only with HW-only algorithms
1547                  * but why didn't it decrypt the frame?!
1548                  */
1549                 return RX_DROP_UNUSABLE;
1550         }
1551 
1552         /* the hdr variable is invalid after the decrypt handlers */
1553 
1554         /* either the frame has been decrypted or will be dropped */
1555         status->flag |= RX_FLAG_DECRYPTED;
1556 
1557         return result;
1558 }
1559 
1560 static inline struct ieee80211_fragment_entry *
1561 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1562                          unsigned int frag, unsigned int seq, int rx_queue,
1563                          struct sk_buff **skb)
1564 {
1565         struct ieee80211_fragment_entry *entry;
1566 
1567         entry = &sdata->fragments[sdata->fragment_next++];
1568         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1569                 sdata->fragment_next = 0;
1570 
1571         if (!skb_queue_empty(&entry->skb_list))
1572                 __skb_queue_purge(&entry->skb_list);
1573 
1574         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1575         *skb = NULL;
1576         entry->first_frag_time = jiffies;
1577         entry->seq = seq;
1578         entry->rx_queue = rx_queue;
1579         entry->last_frag = frag;
1580         entry->ccmp = 0;
1581         entry->extra_len = 0;
1582 
1583         return entry;
1584 }
1585 
1586 static inline struct ieee80211_fragment_entry *
1587 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1588                           unsigned int frag, unsigned int seq,
1589                           int rx_queue, struct ieee80211_hdr *hdr)
1590 {
1591         struct ieee80211_fragment_entry *entry;
1592         int i, idx;
1593 
1594         idx = sdata->fragment_next;
1595         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1596                 struct ieee80211_hdr *f_hdr;
1597 
1598                 idx--;
1599                 if (idx < 0)
1600                         idx = IEEE80211_FRAGMENT_MAX - 1;
1601 
1602                 entry = &sdata->fragments[idx];
1603                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1604                     entry->rx_queue != rx_queue ||
1605                     entry->last_frag + 1 != frag)
1606                         continue;
1607 
1608                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1609 
1610                 /*
1611                  * Check ftype and addresses are equal, else check next fragment
1612                  */
1613                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1614                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1615                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1616                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1617                         continue;
1618 
1619                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1620                         __skb_queue_purge(&entry->skb_list);
1621                         continue;
1622                 }
1623                 return entry;
1624         }
1625 
1626         return NULL;
1627 }
1628 
1629 static ieee80211_rx_result debug_noinline
1630 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1631 {
1632         struct ieee80211_hdr *hdr;
1633         u16 sc;
1634         __le16 fc;
1635         unsigned int frag, seq;
1636         struct ieee80211_fragment_entry *entry;
1637         struct sk_buff *skb;
1638         struct ieee80211_rx_status *status;
1639 
1640         hdr = (struct ieee80211_hdr *)rx->skb->data;
1641         fc = hdr->frame_control;
1642 
1643         if (ieee80211_is_ctl(fc))
1644                 return RX_CONTINUE;
1645 
1646         sc = le16_to_cpu(hdr->seq_ctrl);
1647         frag = sc & IEEE80211_SCTL_FRAG;
1648 
1649         if (is_multicast_ether_addr(hdr->addr1)) {
1650                 rx->local->dot11MulticastReceivedFrameCount++;
1651                 goto out_no_led;
1652         }
1653 
1654         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1655                 goto out;
1656 
1657         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1658 
1659         if (skb_linearize(rx->skb))
1660                 return RX_DROP_UNUSABLE;
1661 
1662         /*
1663          *  skb_linearize() might change the skb->data and
1664          *  previously cached variables (in this case, hdr) need to
1665          *  be refreshed with the new data.
1666          */
1667         hdr = (struct ieee80211_hdr *)rx->skb->data;
1668         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1669 
1670         if (frag == 0) {
1671                 /* This is the first fragment of a new frame. */
1672                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1673                                                  rx->seqno_idx, &(rx->skb));
1674                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1675                     ieee80211_has_protected(fc)) {
1676                         int queue = rx->security_idx;
1677                         /* Store CCMP PN so that we can verify that the next
1678                          * fragment has a sequential PN value. */
1679                         entry->ccmp = 1;
1680                         memcpy(entry->last_pn,
1681                                rx->key->u.ccmp.rx_pn[queue],
1682                                IEEE80211_CCMP_PN_LEN);
1683                 }
1684                 return RX_QUEUED;
1685         }
1686 
1687         /* This is a fragment for a frame that should already be pending in
1688          * fragment cache. Add this fragment to the end of the pending entry.
1689          */
1690         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1691                                           rx->seqno_idx, hdr);
1692         if (!entry) {
1693                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1694                 return RX_DROP_MONITOR;
1695         }
1696 
1697         /* Verify that MPDUs within one MSDU have sequential PN values.
1698          * (IEEE 802.11i, 8.3.3.4.5) */
1699         if (entry->ccmp) {
1700                 int i;
1701                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1702                 int queue;
1703                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1704                         return RX_DROP_UNUSABLE;
1705                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1706                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1707                         pn[i]++;
1708                         if (pn[i])
1709                                 break;
1710                 }
1711                 queue = rx->security_idx;
1712                 rpn = rx->key->u.ccmp.rx_pn[queue];
1713                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1714                         return RX_DROP_UNUSABLE;
1715                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1716         }
1717 
1718         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1719         __skb_queue_tail(&entry->skb_list, rx->skb);
1720         entry->last_frag = frag;
1721         entry->extra_len += rx->skb->len;
1722         if (ieee80211_has_morefrags(fc)) {
1723                 rx->skb = NULL;
1724                 return RX_QUEUED;
1725         }
1726 
1727         rx->skb = __skb_dequeue(&entry->skb_list);
1728         if (skb_tailroom(rx->skb) < entry->extra_len) {
1729                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1730                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1731                                               GFP_ATOMIC))) {
1732                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1733                         __skb_queue_purge(&entry->skb_list);
1734                         return RX_DROP_UNUSABLE;
1735                 }
1736         }
1737         while ((skb = __skb_dequeue(&entry->skb_list))) {
1738                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1739                 dev_kfree_skb(skb);
1740         }
1741 
1742         /* Complete frame has been reassembled - process it now */
1743         status = IEEE80211_SKB_RXCB(rx->skb);
1744         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1745 
1746  out:
1747         ieee80211_led_rx(rx->local);
1748  out_no_led:
1749         if (rx->sta)
1750                 rx->sta->rx_packets++;
1751         return RX_CONTINUE;
1752 }
1753 
1754 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1755 {
1756         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1757                 return -EACCES;
1758 
1759         return 0;
1760 }
1761 
1762 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1763 {
1764         struct sk_buff *skb = rx->skb;
1765         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1766 
1767         /*
1768          * Pass through unencrypted frames if the hardware has
1769          * decrypted them already.
1770          */
1771         if (status->flag & RX_FLAG_DECRYPTED)
1772                 return 0;
1773 
1774         /* Drop unencrypted frames if key is set. */
1775         if (unlikely(!ieee80211_has_protected(fc) &&
1776                      !ieee80211_is_nullfunc(fc) &&
1777                      ieee80211_is_data(fc) &&
1778                      (rx->key || rx->sdata->drop_unencrypted)))
1779                 return -EACCES;
1780 
1781         return 0;
1782 }
1783 
1784 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1785 {
1786         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1787         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1788         __le16 fc = hdr->frame_control;
1789 
1790         /*
1791          * Pass through unencrypted frames if the hardware has
1792          * decrypted them already.
1793          */
1794         if (status->flag & RX_FLAG_DECRYPTED)
1795                 return 0;
1796 
1797         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1798                 if (unlikely(!ieee80211_has_protected(fc) &&
1799                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1800                              rx->key)) {
1801                         if (ieee80211_is_deauth(fc) ||
1802                             ieee80211_is_disassoc(fc))
1803                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1804                                                              rx->skb->data,
1805                                                              rx->skb->len);
1806                         return -EACCES;
1807                 }
1808                 /* BIP does not use Protected field, so need to check MMIE */
1809                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1810                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1811                         if (ieee80211_is_deauth(fc) ||
1812                             ieee80211_is_disassoc(fc))
1813                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1814                                                              rx->skb->data,
1815                                                              rx->skb->len);
1816                         return -EACCES;
1817                 }
1818                 /*
1819                  * When using MFP, Action frames are not allowed prior to
1820                  * having configured keys.
1821                  */
1822                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1823                              ieee80211_is_robust_mgmt_frame(
1824                                      (struct ieee80211_hdr *) rx->skb->data)))
1825                         return -EACCES;
1826         }
1827 
1828         return 0;
1829 }
1830 
1831 static int
1832 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1833 {
1834         struct ieee80211_sub_if_data *sdata = rx->sdata;
1835         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1836         bool check_port_control = false;
1837         struct ethhdr *ehdr;
1838         int ret;
1839 
1840         *port_control = false;
1841         if (ieee80211_has_a4(hdr->frame_control) &&
1842             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1843                 return -1;
1844 
1845         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1846             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1847 
1848                 if (!sdata->u.mgd.use_4addr)
1849                         return -1;
1850                 else
1851                         check_port_control = true;
1852         }
1853 
1854         if (is_multicast_ether_addr(hdr->addr1) &&
1855             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1856                 return -1;
1857 
1858         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1859         if (ret < 0)
1860                 return ret;
1861 
1862         ehdr = (struct ethhdr *) rx->skb->data;
1863         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1864                 *port_control = true;
1865         else if (check_port_control)
1866                 return -1;
1867 
1868         return 0;
1869 }
1870 
1871 /*
1872  * requires that rx->skb is a frame with ethernet header
1873  */
1874 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1875 {
1876         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1877                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1878         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1879 
1880         /*
1881          * Allow EAPOL frames to us/the PAE group address regardless
1882          * of whether the frame was encrypted or not.
1883          */
1884         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1885             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1886              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1887                 return true;
1888 
1889         if (ieee80211_802_1x_port_control(rx) ||
1890             ieee80211_drop_unencrypted(rx, fc))
1891                 return false;
1892 
1893         return true;
1894 }
1895 
1896 /*
1897  * requires that rx->skb is a frame with ethernet header
1898  */
1899 static void
1900 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1901 {
1902         struct ieee80211_sub_if_data *sdata = rx->sdata;
1903         struct net_device *dev = sdata->dev;
1904         struct sk_buff *skb, *xmit_skb;
1905         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1906         struct sta_info *dsta;
1907         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1908 
1909         skb = rx->skb;
1910         xmit_skb = NULL;
1911 
1912         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1913              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1914             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1915             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1916             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1917                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1918                         /*
1919                          * send multicast frames both to higher layers in
1920                          * local net stack and back to the wireless medium
1921                          */
1922                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1923                         if (!xmit_skb)
1924                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1925                                                     dev->name);
1926                 } else {
1927                         dsta = sta_info_get(sdata, skb->data);
1928                         if (dsta) {
1929                                 /*
1930                                  * The destination station is associated to
1931                                  * this AP (in this VLAN), so send the frame
1932                                  * directly to it and do not pass it to local
1933                                  * net stack.
1934                                  */
1935                                 xmit_skb = skb;
1936                                 skb = NULL;
1937                         }
1938                 }
1939         }
1940 
1941         if (skb) {
1942                 int align __maybe_unused;
1943 
1944 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1945                 /*
1946                  * 'align' will only take the values 0 or 2 here
1947                  * since all frames are required to be aligned
1948                  * to 2-byte boundaries when being passed to
1949                  * mac80211; the code here works just as well if
1950                  * that isn't true, but mac80211 assumes it can
1951                  * access fields as 2-byte aligned (e.g. for
1952                  * compare_ether_addr)
1953                  */
1954                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1955                 if (align) {
1956                         if (WARN_ON(skb_headroom(skb) < 3)) {
1957                                 dev_kfree_skb(skb);
1958                                 skb = NULL;
1959                         } else {
1960                                 u8 *data = skb->data;
1961                                 size_t len = skb_headlen(skb);
1962                                 skb->data -= align;
1963                                 memmove(skb->data, data, len);
1964                                 skb_set_tail_pointer(skb, len);
1965                         }
1966                 }
1967 #endif
1968 
1969                 if (skb) {
1970                         /* deliver to local stack */
1971                         skb->protocol = eth_type_trans(skb, dev);
1972                         memset(skb->cb, 0, sizeof(skb->cb));
1973                         netif_receive_skb(skb);
1974                 }
1975         }
1976 
1977         if (xmit_skb) {
1978                 /*
1979                  * Send to wireless media and increase priority by 256 to
1980                  * keep the received priority instead of reclassifying
1981                  * the frame (see cfg80211_classify8021d).
1982                  */
1983                 xmit_skb->priority += 256;
1984                 xmit_skb->protocol = htons(ETH_P_802_3);
1985                 skb_reset_network_header(xmit_skb);
1986                 skb_reset_mac_header(xmit_skb);
1987                 dev_queue_xmit(xmit_skb);
1988         }
1989 }
1990 
1991 static ieee80211_rx_result debug_noinline
1992 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1993 {
1994         struct net_device *dev = rx->sdata->dev;
1995         struct sk_buff *skb = rx->skb;
1996         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1997         __le16 fc = hdr->frame_control;
1998         struct sk_buff_head frame_list;
1999         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2000 
2001         if (unlikely(!ieee80211_is_data(fc)))
2002                 return RX_CONTINUE;
2003 
2004         if (unlikely(!ieee80211_is_data_present(fc)))
2005                 return RX_DROP_MONITOR;
2006 
2007         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2008                 return RX_CONTINUE;
2009 
2010         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2011                 switch (rx->sdata->vif.type) {
2012                 case NL80211_IFTYPE_AP_VLAN:
2013                         if (!rx->sdata->u.vlan.sta)
2014                                 return RX_DROP_UNUSABLE;
2015                         break;
2016                 case NL80211_IFTYPE_STATION:
2017                         if (!rx->sdata->u.mgd.use_4addr)
2018                                 return RX_DROP_UNUSABLE;
2019                         break;
2020                 default:
2021                         return RX_DROP_UNUSABLE;
2022                 }
2023         }
2024 
2025         if (is_multicast_ether_addr(hdr->addr1))
2026                 return RX_DROP_UNUSABLE;
2027 
2028         skb->dev = dev;
2029         __skb_queue_head_init(&frame_list);
2030 
2031         if (skb_linearize(skb))
2032                 return RX_DROP_UNUSABLE;
2033 
2034         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2035                                  rx->sdata->vif.type,
2036                                  rx->local->hw.extra_tx_headroom, true);
2037 
2038         while (!skb_queue_empty(&frame_list)) {
2039                 rx->skb = __skb_dequeue(&frame_list);
2040 
2041                 if (!ieee80211_frame_allowed(rx, fc)) {
2042                         dev_kfree_skb(rx->skb);
2043                         continue;
2044                 }
2045                 dev->stats.rx_packets++;
2046                 dev->stats.rx_bytes += rx->skb->len;
2047 
2048                 ieee80211_deliver_skb(rx);
2049         }
2050 
2051         return RX_QUEUED;
2052 }
2053 
2054 #ifdef CONFIG_MAC80211_MESH
2055 static ieee80211_rx_result
2056 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2057 {
2058         struct ieee80211_hdr *fwd_hdr, *hdr;
2059         struct ieee80211_tx_info *info;
2060         struct ieee80211s_hdr *mesh_hdr;
2061         struct sk_buff *skb = rx->skb, *fwd_skb;
2062         struct ieee80211_local *local = rx->local;
2063         struct ieee80211_sub_if_data *sdata = rx->sdata;
2064         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2065         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2066         __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
2067         u16 ac, q, hdrlen;
2068 
2069         hdr = (struct ieee80211_hdr *) skb->data;
2070         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2071 
2072         /* make sure fixed part of mesh header is there, also checks skb len */
2073         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2074                 return RX_DROP_MONITOR;
2075 
2076         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2077 
2078         /* make sure full mesh header is there, also checks skb len */
2079         if (!pskb_may_pull(rx->skb,
2080                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2081                 return RX_DROP_MONITOR;
2082 
2083         /* reload pointers */
2084         hdr = (struct ieee80211_hdr *) skb->data;
2085         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2086 
2087         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2088                 return RX_DROP_MONITOR;
2089 
2090         /* frame is in RMC, don't forward */
2091         if (ieee80211_is_data(hdr->frame_control) &&
2092             is_multicast_ether_addr(hdr->addr1) &&
2093             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2094                 return RX_DROP_MONITOR;
2095 
2096         if (!ieee80211_is_data(hdr->frame_control) ||
2097             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2098                 return RX_CONTINUE;
2099 
2100         if (!mesh_hdr->ttl)
2101                 return RX_DROP_MONITOR;
2102 
2103         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2104                 struct mesh_path *mppath;
2105                 char *proxied_addr;
2106                 char *mpp_addr;
2107 
2108                 if (is_multicast_ether_addr(hdr->addr1)) {
2109                         mpp_addr = hdr->addr3;
2110                         proxied_addr = mesh_hdr->eaddr1;
2111                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2112                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2113                         mpp_addr = hdr->addr4;
2114                         proxied_addr = mesh_hdr->eaddr2;
2115                 } else {
2116                         return RX_DROP_MONITOR;
2117                 }
2118 
2119                 rcu_read_lock();
2120                 mppath = mpp_path_lookup(sdata, proxied_addr);
2121                 if (!mppath) {
2122                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2123                 } else {
2124                         spin_lock_bh(&mppath->state_lock);
2125                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2126                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2127                         spin_unlock_bh(&mppath->state_lock);
2128                 }
2129                 rcu_read_unlock();
2130         }
2131 
2132         /* Frame has reached destination.  Don't forward */
2133         if (!is_multicast_ether_addr(hdr->addr1) &&
2134             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2135                 return RX_CONTINUE;
2136 
2137         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2138         q = sdata->vif.hw_queue[ac];
2139         if (ieee80211_queue_stopped(&local->hw, q)) {
2140                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2141                 return RX_DROP_MONITOR;
2142         }
2143         skb_set_queue_mapping(skb, q);
2144 
2145         if (!--mesh_hdr->ttl) {
2146                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2147                 goto out;
2148         }
2149 
2150         if (!ifmsh->mshcfg.dot11MeshForwarding)
2151                 goto out;
2152 
2153         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2154         if (!fwd_skb) {
2155                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2156                                     sdata->name);
2157                 goto out;
2158         }
2159 
2160         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2161         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2162         info = IEEE80211_SKB_CB(fwd_skb);
2163         memset(info, 0, sizeof(*info));
2164         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2165         info->control.vif = &rx->sdata->vif;
2166         info->control.jiffies = jiffies;
2167         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2168                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2169                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2170                 /* update power mode indication when forwarding */
2171                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2172         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2173                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2174                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2175         } else {
2176                 /* unable to resolve next hop */
2177                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2178                                    fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
2179                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2180                 kfree_skb(fwd_skb);
2181                 return RX_DROP_MONITOR;
2182         }
2183 
2184         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2185         ieee80211_add_pending_skb(local, fwd_skb);
2186  out:
2187         if (is_multicast_ether_addr(hdr->addr1) ||
2188             sdata->dev->flags & IFF_PROMISC)
2189                 return RX_CONTINUE;
2190         else
2191                 return RX_DROP_MONITOR;
2192 }
2193 #endif
2194 
2195 static ieee80211_rx_result debug_noinline
2196 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2197 {
2198         struct ieee80211_sub_if_data *sdata = rx->sdata;
2199         struct ieee80211_local *local = rx->local;
2200         struct net_device *dev = sdata->dev;
2201         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2202         __le16 fc = hdr->frame_control;
2203         bool port_control;
2204         int err;
2205 
2206         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2207                 return RX_CONTINUE;
2208 
2209         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2210                 return RX_DROP_MONITOR;
2211 
2212         /*
2213          * Send unexpected-4addr-frame event to hostapd. For older versions,
2214          * also drop the frame to cooked monitor interfaces.
2215          */
2216         if (ieee80211_has_a4(hdr->frame_control) &&
2217             sdata->vif.type == NL80211_IFTYPE_AP) {
2218                 if (rx->sta &&
2219                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2220                         cfg80211_rx_unexpected_4addr_frame(
2221                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2222                 return RX_DROP_MONITOR;
2223         }
2224 
2225         err = __ieee80211_data_to_8023(rx, &port_control);
2226         if (unlikely(err))
2227                 return RX_DROP_UNUSABLE;
2228 
2229         if (!ieee80211_frame_allowed(rx, fc))
2230                 return RX_DROP_MONITOR;
2231 
2232         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2233             unlikely(port_control) && sdata->bss) {
2234                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2235                                      u.ap);
2236                 dev = sdata->dev;
2237                 rx->sdata = sdata;
2238         }
2239 
2240         rx->skb->dev = dev;
2241 
2242         dev->stats.rx_packets++;
2243         dev->stats.rx_bytes += rx->skb->len;
2244 
2245         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2246             !is_multicast_ether_addr(
2247                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2248             (!local->scanning &&
2249              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2250                         mod_timer(&local->dynamic_ps_timer, jiffies +
2251                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2252         }
2253 
2254         ieee80211_deliver_skb(rx);
2255 
2256         return RX_QUEUED;
2257 }
2258 
2259 static ieee80211_rx_result debug_noinline
2260 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2261 {
2262         struct sk_buff *skb = rx->skb;
2263         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2264         struct tid_ampdu_rx *tid_agg_rx;
2265         u16 start_seq_num;
2266         u16 tid;
2267 
2268         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2269                 return RX_CONTINUE;
2270 
2271         if (ieee80211_is_back_req(bar->frame_control)) {
2272                 struct {
2273                         __le16 control, start_seq_num;
2274                 } __packed bar_data;
2275 
2276                 if (!rx->sta)
2277                         return RX_DROP_MONITOR;
2278 
2279                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2280                                   &bar_data, sizeof(bar_data)))
2281                         return RX_DROP_MONITOR;
2282 
2283                 tid = le16_to_cpu(bar_data.control) >> 12;
2284 
2285                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2286                 if (!tid_agg_rx)
2287                         return RX_DROP_MONITOR;
2288 
2289                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2290 
2291                 /* reset session timer */
2292                 if (tid_agg_rx->timeout)
2293                         mod_timer(&tid_agg_rx->session_timer,
2294                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2295 
2296                 spin_lock(&tid_agg_rx->reorder_lock);
2297                 /* release stored frames up to start of BAR */
2298                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2299                                                  start_seq_num, frames);
2300                 spin_unlock(&tid_agg_rx->reorder_lock);
2301 
2302                 kfree_skb(skb);
2303                 return RX_QUEUED;
2304         }
2305 
2306         /*
2307          * After this point, we only want management frames,
2308          * so we can drop all remaining control frames to
2309          * cooked monitor interfaces.
2310          */
2311         return RX_DROP_MONITOR;
2312 }
2313 
2314 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2315                                            struct ieee80211_mgmt *mgmt,
2316                                            size_t len)
2317 {
2318         struct ieee80211_local *local = sdata->local;
2319         struct sk_buff *skb;
2320         struct ieee80211_mgmt *resp;
2321 
2322         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2323                 /* Not to own unicast address */
2324                 return;
2325         }
2326 
2327         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2328             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2329                 /* Not from the current AP or not associated yet. */
2330                 return;
2331         }
2332 
2333         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2334                 /* Too short SA Query request frame */
2335                 return;
2336         }
2337 
2338         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2339         if (skb == NULL)
2340                 return;
2341 
2342         skb_reserve(skb, local->hw.extra_tx_headroom);
2343         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2344         memset(resp, 0, 24);
2345         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2346         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2347         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2348         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2349                                           IEEE80211_STYPE_ACTION);
2350         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2351         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2352         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2353         memcpy(resp->u.action.u.sa_query.trans_id,
2354                mgmt->u.action.u.sa_query.trans_id,
2355                WLAN_SA_QUERY_TR_ID_LEN);
2356 
2357         ieee80211_tx_skb(sdata, skb);
2358 }
2359 
2360 static ieee80211_rx_result debug_noinline
2361 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2362 {
2363         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2364         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2365 
2366         /*
2367          * From here on, look only at management frames.
2368          * Data and control frames are already handled,
2369          * and unknown (reserved) frames are useless.
2370          */
2371         if (rx->skb->len < 24)
2372                 return RX_DROP_MONITOR;
2373 
2374         if (!ieee80211_is_mgmt(mgmt->frame_control))
2375                 return RX_DROP_MONITOR;
2376 
2377         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2378             ieee80211_is_beacon(mgmt->frame_control) &&
2379             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2380                 int sig = 0;
2381 
2382                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2383                         sig = status->signal;
2384 
2385                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2386                                             rx->skb->data, rx->skb->len,
2387                                             status->freq, sig);
2388                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2389         }
2390 
2391         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2392                 return RX_DROP_MONITOR;
2393 
2394         if (ieee80211_drop_unencrypted_mgmt(rx))
2395                 return RX_DROP_UNUSABLE;
2396 
2397         return RX_CONTINUE;
2398 }
2399 
2400 static ieee80211_rx_result debug_noinline
2401 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2402 {
2403         struct ieee80211_local *local = rx->local;
2404         struct ieee80211_sub_if_data *sdata = rx->sdata;
2405         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2406         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2407         int len = rx->skb->len;
2408 
2409         if (!ieee80211_is_action(mgmt->frame_control))
2410                 return RX_CONTINUE;
2411 
2412         /* drop too small frames */
2413         if (len < IEEE80211_MIN_ACTION_SIZE)
2414                 return RX_DROP_UNUSABLE;
2415 
2416         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2417             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
2418                 return RX_DROP_UNUSABLE;
2419 
2420         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2421                 return RX_DROP_UNUSABLE;
2422 
2423         switch (mgmt->u.action.category) {
2424         case WLAN_CATEGORY_HT:
2425                 /* reject HT action frames from stations not supporting HT */
2426                 if (!rx->sta->sta.ht_cap.ht_supported)
2427                         goto invalid;
2428 
2429                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2430                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2431                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2432                     sdata->vif.type != NL80211_IFTYPE_AP &&
2433                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2434                         break;
2435 
2436                 /* verify action & smps_control/chanwidth are present */
2437                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2438                         goto invalid;
2439 
2440                 switch (mgmt->u.action.u.ht_smps.action) {
2441                 case WLAN_HT_ACTION_SMPS: {
2442                         struct ieee80211_supported_band *sband;
2443                         enum ieee80211_smps_mode smps_mode;
2444 
2445                         /* convert to HT capability */
2446                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2447                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2448                                 smps_mode = IEEE80211_SMPS_OFF;
2449                                 break;
2450                         case WLAN_HT_SMPS_CONTROL_STATIC:
2451                                 smps_mode = IEEE80211_SMPS_STATIC;
2452                                 break;
2453                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2454                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2455                                 break;
2456                         default:
2457                                 goto invalid;
2458                         }
2459 
2460                         /* if no change do nothing */
2461                         if (rx->sta->sta.smps_mode == smps_mode)
2462                                 goto handled;
2463                         rx->sta->sta.smps_mode = smps_mode;
2464 
2465                         sband = rx->local->hw.wiphy->bands[status->band];
2466 
2467                         rate_control_rate_update(local, sband, rx->sta,
2468                                                  IEEE80211_RC_SMPS_CHANGED);
2469                         goto handled;
2470                 }
2471                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2472                         struct ieee80211_supported_band *sband;
2473                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2474                         enum ieee80211_sta_rx_bandwidth new_bw;
2475 
2476                         /* If it doesn't support 40 MHz it can't change ... */
2477                         if (!(rx->sta->sta.ht_cap.cap &
2478                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2479                                 goto handled;
2480 
2481                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2482                                 new_bw = IEEE80211_STA_RX_BW_20;
2483                         else
2484                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2485 
2486                         if (rx->sta->sta.bandwidth == new_bw)
2487                                 goto handled;
2488 
2489                         sband = rx->local->hw.wiphy->bands[status->band];
2490 
2491                         rate_control_rate_update(local, sband, rx->sta,
2492                                                  IEEE80211_RC_BW_CHANGED);
2493                         goto handled;
2494                 }
2495                 default:
2496                         goto invalid;
2497                 }
2498 
2499                 break;
2500         case WLAN_CATEGORY_PUBLIC:
2501                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2502                         goto invalid;
2503                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2504                         break;
2505                 if (!rx->sta)
2506                         break;
2507                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2508                         break;
2509                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2510                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2511                         break;
2512                 if (len < offsetof(struct ieee80211_mgmt,
2513                                    u.action.u.ext_chan_switch.variable))
2514                         goto invalid;
2515                 goto queue;
2516         case WLAN_CATEGORY_VHT:
2517                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2518                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2519                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2520                     sdata->vif.type != NL80211_IFTYPE_AP &&
2521                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2522                         break;
2523 
2524                 /* verify action code is present */
2525                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2526                         goto invalid;
2527 
2528                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2529                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2530                         u8 opmode;
2531 
2532                         /* verify opmode is present */
2533                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2534                                 goto invalid;
2535 
2536                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2537 
2538                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2539                                                     opmode, status->band,
2540                                                     false);
2541                         goto handled;
2542                 }
2543                 default:
2544                         break;
2545                 }
2546                 break;
2547         case WLAN_CATEGORY_BACK:
2548                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2549                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2550                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2551                     sdata->vif.type != NL80211_IFTYPE_AP &&
2552                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2553                         break;
2554 
2555                 /* verify action_code is present */
2556                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2557                         break;
2558 
2559                 switch (mgmt->u.action.u.addba_req.action_code) {
2560                 case WLAN_ACTION_ADDBA_REQ:
2561                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2562                                    sizeof(mgmt->u.action.u.addba_req)))
2563                                 goto invalid;
2564                         break;
2565                 case WLAN_ACTION_ADDBA_RESP:
2566                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2567                                    sizeof(mgmt->u.action.u.addba_resp)))
2568                                 goto invalid;
2569                         break;
2570                 case WLAN_ACTION_DELBA:
2571                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2572                                    sizeof(mgmt->u.action.u.delba)))
2573                                 goto invalid;
2574                         break;
2575                 default:
2576                         goto invalid;
2577                 }
2578 
2579                 goto queue;
2580         case WLAN_CATEGORY_SPECTRUM_MGMT:
2581                 if (status->band != IEEE80211_BAND_5GHZ)
2582                         break;
2583 
2584                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2585                         break;
2586 
2587                 /* verify action_code is present */
2588                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2589                         break;
2590 
2591                 switch (mgmt->u.action.u.measurement.action_code) {
2592                 case WLAN_ACTION_SPCT_MSR_REQ:
2593                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2594                                    sizeof(mgmt->u.action.u.measurement)))
2595                                 break;
2596                         ieee80211_process_measurement_req(sdata, mgmt, len);
2597                         goto handled;
2598                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2599                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2600                                 break;
2601 
2602                         if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2603                                 break;
2604 
2605                         goto queue;
2606                 }
2607                 break;
2608         case WLAN_CATEGORY_SA_QUERY:
2609                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2610                            sizeof(mgmt->u.action.u.sa_query)))
2611                         break;
2612 
2613                 switch (mgmt->u.action.u.sa_query.action) {
2614                 case WLAN_ACTION_SA_QUERY_REQUEST:
2615                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2616                                 break;
2617                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2618                         goto handled;
2619                 }
2620                 break;
2621         case WLAN_CATEGORY_SELF_PROTECTED:
2622                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2623                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2624                         break;
2625 
2626                 switch (mgmt->u.action.u.self_prot.action_code) {
2627                 case WLAN_SP_MESH_PEERING_OPEN:
2628                 case WLAN_SP_MESH_PEERING_CLOSE:
2629                 case WLAN_SP_MESH_PEERING_CONFIRM:
2630                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2631                                 goto invalid;
2632                         if (sdata->u.mesh.user_mpm)
2633                                 /* userspace handles this frame */
2634                                 break;
2635                         goto queue;
2636                 case WLAN_SP_MGK_INFORM:
2637                 case WLAN_SP_MGK_ACK:
2638                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2639                                 goto invalid;
2640                         break;
2641                 }
2642                 break;
2643         case WLAN_CATEGORY_MESH_ACTION:
2644                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2645                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2646                         break;
2647 
2648                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2649                         break;
2650                 if (mesh_action_is_path_sel(mgmt) &&
2651                     !mesh_path_sel_is_hwmp(sdata))
2652                         break;
2653                 goto queue;
2654         }
2655 
2656         return RX_CONTINUE;
2657 
2658  invalid:
2659         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2660         /* will return in the next handlers */
2661         return RX_CONTINUE;
2662 
2663  handled:
2664         if (rx->sta)
2665                 rx->sta->rx_packets++;
2666         dev_kfree_skb(rx->skb);
2667         return RX_QUEUED;
2668 
2669  queue:
2670         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2671         skb_queue_tail(&sdata->skb_queue, rx->skb);
2672         ieee80211_queue_work(&local->hw, &sdata->work);
2673         if (rx->sta)
2674                 rx->sta->rx_packets++;
2675         return RX_QUEUED;
2676 }
2677 
2678 static ieee80211_rx_result debug_noinline
2679 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2680 {
2681         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2682         int sig = 0;
2683 
2684         /* skip known-bad action frames and return them in the next handler */
2685         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2686                 return RX_CONTINUE;
2687 
2688         /*
2689          * Getting here means the kernel doesn't know how to handle
2690          * it, but maybe userspace does ... include returned frames
2691          * so userspace can register for those to know whether ones
2692          * it transmitted were processed or returned.
2693          */
2694 
2695         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2696                 sig = status->signal;
2697 
2698         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2699                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2700                 if (rx->sta)
2701                         rx->sta->rx_packets++;
2702                 dev_kfree_skb(rx->skb);
2703                 return RX_QUEUED;
2704         }
2705 
2706         return RX_CONTINUE;
2707 }
2708 
2709 static ieee80211_rx_result debug_noinline
2710 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2711 {
2712         struct ieee80211_local *local = rx->local;
2713         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2714         struct sk_buff *nskb;
2715         struct ieee80211_sub_if_data *sdata = rx->sdata;
2716         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2717 
2718         if (!ieee80211_is_action(mgmt->frame_control))
2719                 return RX_CONTINUE;
2720 
2721         /*
2722          * For AP mode, hostapd is responsible for handling any action
2723          * frames that we didn't handle, including returning unknown
2724          * ones. For all other modes we will return them to the sender,
2725          * setting the 0x80 bit in the action category, as required by
2726          * 802.11-2012 9.24.4.
2727          * Newer versions of hostapd shall also use the management frame
2728          * registration mechanisms, but older ones still use cooked
2729          * monitor interfaces so push all frames there.
2730          */
2731         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2732             (sdata->vif.type == NL80211_IFTYPE_AP ||
2733              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2734                 return RX_DROP_MONITOR;
2735 
2736         if (is_multicast_ether_addr(mgmt->da))
2737                 return RX_DROP_MONITOR;
2738 
2739         /* do not return rejected action frames */
2740         if (mgmt->u.action.category & 0x80)
2741                 return RX_DROP_UNUSABLE;
2742 
2743         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2744                                GFP_ATOMIC);
2745         if (nskb) {
2746                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2747 
2748                 nmgmt->u.action.category |= 0x80;
2749                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2750                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2751 
2752                 memset(nskb->cb, 0, sizeof(nskb->cb));
2753 
2754                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2755                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2756 
2757                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2758                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2759                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2760                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2761                                 info->hw_queue =
2762                                         local->hw.offchannel_tx_hw_queue;
2763                 }
2764 
2765                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2766                                             status->band);
2767         }
2768         dev_kfree_skb(rx->skb);
2769         return RX_QUEUED;
2770 }
2771 
2772 static ieee80211_rx_result debug_noinline
2773 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2774 {
2775         struct ieee80211_sub_if_data *sdata = rx->sdata;
2776         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2777         __le16 stype;
2778 
2779         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2780 
2781         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2782             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2783             sdata->vif.type != NL80211_IFTYPE_STATION)
2784                 return RX_DROP_MONITOR;
2785 
2786         switch (stype) {
2787         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2788         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2789         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2790                 /* process for all: mesh, mlme, ibss */
2791                 break;
2792         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2793         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2794         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2795         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2796                 if (is_multicast_ether_addr(mgmt->da) &&
2797                     !is_broadcast_ether_addr(mgmt->da))
2798                         return RX_DROP_MONITOR;
2799 
2800                 /* process only for station */
2801                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2802                         return RX_DROP_MONITOR;
2803                 break;
2804         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2805                 /* process only for ibss and mesh */
2806                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2807                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2808                         return RX_DROP_MONITOR;
2809                 break;
2810         default:
2811                 return RX_DROP_MONITOR;
2812         }
2813 
2814         /* queue up frame and kick off work to process it */
2815         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2816         skb_queue_tail(&sdata->skb_queue, rx->skb);
2817         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2818         if (rx->sta)
2819                 rx->sta->rx_packets++;
2820 
2821         return RX_QUEUED;
2822 }
2823 
2824 /* TODO: use IEEE80211_RX_FRAGMENTED */
2825 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2826                                         struct ieee80211_rate *rate)
2827 {
2828         struct ieee80211_sub_if_data *sdata;
2829         struct ieee80211_local *local = rx->local;
2830         struct sk_buff *skb = rx->skb, *skb2;
2831         struct net_device *prev_dev = NULL;
2832         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2833         int needed_headroom;
2834 
2835         /*
2836          * If cooked monitor has been processed already, then
2837          * don't do it again. If not, set the flag.
2838          */
2839         if (rx->flags & IEEE80211_RX_CMNTR)
2840                 goto out_free_skb;
2841         rx->flags |= IEEE80211_RX_CMNTR;
2842 
2843         /* If there are no cooked monitor interfaces, just free the SKB */
2844         if (!local->cooked_mntrs)
2845                 goto out_free_skb;
2846 
2847         /* room for the radiotap header based on driver features */
2848         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2849 
2850         if (skb_headroom(skb) < needed_headroom &&
2851             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2852                 goto out_free_skb;
2853 
2854         /* prepend radiotap information */
2855         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2856                                          false);
2857 
2858         skb_set_mac_header(skb, 0);
2859         skb->ip_summed = CHECKSUM_UNNECESSARY;
2860         skb->pkt_type = PACKET_OTHERHOST;
2861         skb->protocol = htons(ETH_P_802_2);
2862 
2863         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2864                 if (!ieee80211_sdata_running(sdata))
2865                         continue;
2866 
2867                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2868                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2869                         continue;
2870 
2871                 if (prev_dev) {
2872                         skb2 = skb_clone(skb, GFP_ATOMIC);
2873                         if (skb2) {
2874                                 skb2->dev = prev_dev;
2875                                 netif_receive_skb(skb2);
2876                         }
2877                 }
2878 
2879                 prev_dev = sdata->dev;
2880                 sdata->dev->stats.rx_packets++;
2881                 sdata->dev->stats.rx_bytes += skb->len;
2882         }
2883 
2884         if (prev_dev) {
2885                 skb->dev = prev_dev;
2886                 netif_receive_skb(skb);
2887                 return;
2888         }
2889 
2890  out_free_skb:
2891         dev_kfree_skb(skb);
2892 }
2893 
2894 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2895                                          ieee80211_rx_result res)
2896 {
2897         switch (res) {
2898         case RX_DROP_MONITOR:
2899                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2900                 if (rx->sta)
2901                         rx->sta->rx_dropped++;
2902                 /* fall through */
2903         case RX_CONTINUE: {
2904                 struct ieee80211_rate *rate = NULL;
2905                 struct ieee80211_supported_band *sband;
2906                 struct ieee80211_rx_status *status;
2907 
2908                 status = IEEE80211_SKB_RXCB((rx->skb));
2909 
2910                 sband = rx->local->hw.wiphy->bands[status->band];
2911                 if (!(status->flag & RX_FLAG_HT) &&
2912                     !(status->flag & RX_FLAG_VHT))
2913                         rate = &sband->bitrates[status->rate_idx];
2914 
2915                 ieee80211_rx_cooked_monitor(rx, rate);
2916                 break;
2917                 }
2918         case RX_DROP_UNUSABLE:
2919                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2920                 if (rx->sta)
2921                         rx->sta->rx_dropped++;
2922                 dev_kfree_skb(rx->skb);
2923                 break;
2924         case RX_QUEUED:
2925                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2926                 break;
2927         }
2928 }
2929 
2930 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2931                                   struct sk_buff_head *frames)
2932 {
2933         ieee80211_rx_result res = RX_DROP_MONITOR;
2934         struct sk_buff *skb;
2935 
2936 #define CALL_RXH(rxh)                   \
2937         do {                            \
2938                 res = rxh(rx);          \
2939                 if (res != RX_CONTINUE) \
2940                         goto rxh_next;  \
2941         } while (0);
2942 
2943         spin_lock_bh(&rx->local->rx_path_lock);
2944 
2945         while ((skb = __skb_dequeue(frames))) {
2946                 /*
2947                  * all the other fields are valid across frames
2948                  * that belong to an aMPDU since they are on the
2949                  * same TID from the same station
2950                  */
2951                 rx->skb = skb;
2952 
2953                 CALL_RXH(ieee80211_rx_h_check_more_data)
2954                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2955                 CALL_RXH(ieee80211_rx_h_sta_process)
2956                 CALL_RXH(ieee80211_rx_h_decrypt)
2957                 CALL_RXH(ieee80211_rx_h_defragment)
2958                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2959                 /* must be after MMIC verify so header is counted in MPDU mic */
2960 #ifdef CONFIG_MAC80211_MESH
2961                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2962                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2963 #endif
2964                 CALL_RXH(ieee80211_rx_h_amsdu)
2965                 CALL_RXH(ieee80211_rx_h_data)
2966 
2967                 /* special treatment -- needs the queue */
2968                 res = ieee80211_rx_h_ctrl(rx, frames);
2969                 if (res != RX_CONTINUE)
2970                         goto rxh_next;
2971 
2972                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2973                 CALL_RXH(ieee80211_rx_h_action)
2974                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2975                 CALL_RXH(ieee80211_rx_h_action_return)
2976                 CALL_RXH(ieee80211_rx_h_mgmt)
2977 
2978  rxh_next:
2979                 ieee80211_rx_handlers_result(rx, res);
2980 
2981 #undef CALL_RXH
2982         }
2983 
2984         spin_unlock_bh(&rx->local->rx_path_lock);
2985 }
2986 
2987 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2988 {
2989         struct sk_buff_head reorder_release;
2990         ieee80211_rx_result res = RX_DROP_MONITOR;
2991 
2992         __skb_queue_head_init(&reorder_release);
2993 
2994 #define CALL_RXH(rxh)                   \
2995         do {                            \
2996                 res = rxh(rx);          \
2997                 if (res != RX_CONTINUE) \
2998                         goto rxh_next;  \
2999         } while (0);
3000 
3001         CALL_RXH(ieee80211_rx_h_check)
3002 
3003         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3004 
3005         ieee80211_rx_handlers(rx, &reorder_release);
3006         return;
3007 
3008  rxh_next:
3009         ieee80211_rx_handlers_result(rx, res);
3010 
3011 #undef CALL_RXH
3012 }
3013 
3014 /*
3015  * This function makes calls into the RX path, therefore
3016  * it has to be invoked under RCU read lock.
3017  */
3018 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3019 {
3020         struct sk_buff_head frames;
3021         struct ieee80211_rx_data rx = {
3022                 .sta = sta,
3023                 .sdata = sta->sdata,
3024                 .local = sta->local,
3025                 /* This is OK -- must be QoS data frame */
3026                 .security_idx = tid,
3027                 .seqno_idx = tid,
3028                 .flags = 0,
3029         };
3030         struct tid_ampdu_rx *tid_agg_rx;
3031 
3032         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3033         if (!tid_agg_rx)
3034                 return;
3035 
3036         __skb_queue_head_init(&frames);
3037 
3038         spin_lock(&tid_agg_rx->reorder_lock);
3039         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3040         spin_unlock(&tid_agg_rx->reorder_lock);
3041 
3042         ieee80211_rx_handlers(&rx, &frames);
3043 }
3044 
3045 /* main receive path */
3046 
3047 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
3048                                 struct ieee80211_hdr *hdr)
3049 {
3050         struct ieee80211_sub_if_data *sdata = rx->sdata;
3051         struct sk_buff *skb = rx->skb;
3052         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3053         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3054         int multicast = is_multicast_ether_addr(hdr->addr1);
3055 
3056         switch (sdata->vif.type) {
3057         case NL80211_IFTYPE_STATION:
3058                 if (!bssid && !sdata->u.mgd.use_4addr)
3059                         return 0;
3060                 if (!multicast &&
3061                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3062                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3063                             sdata->u.mgd.use_4addr)
3064                                 return 0;
3065                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3066                 }
3067                 break;
3068         case NL80211_IFTYPE_ADHOC:
3069                 if (!bssid)
3070                         return 0;
3071                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3072                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3073                         return 0;
3074                 if (ieee80211_is_beacon(hdr->frame_control)) {
3075                         return 1;
3076                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3077                         return 0;
3078                 } else if (!multicast &&
3079                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3080                         if (!(sdata->dev->flags & IFF_PROMISC))
3081                                 return 0;
3082                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3083                 } else if (!rx->sta) {
3084                         int rate_idx;
3085                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3086                                 rate_idx = 0; /* TODO: HT/VHT rates */
3087                         else
3088                                 rate_idx = status->rate_idx;
3089                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3090                                                  BIT(rate_idx));
3091                 }
3092                 break;
3093         case NL80211_IFTYPE_MESH_POINT:
3094                 if (!multicast &&
3095                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3096                         if (!(sdata->dev->flags & IFF_PROMISC))
3097                                 return 0;
3098 
3099                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3100                 }
3101                 break;
3102         case NL80211_IFTYPE_AP_VLAN:
3103         case NL80211_IFTYPE_AP:
3104                 if (!bssid) {
3105                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3106                                 return 0;
3107                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3108                         /*
3109                          * Accept public action frames even when the
3110                          * BSSID doesn't match, this is used for P2P
3111                          * and location updates. Note that mac80211
3112                          * itself never looks at these frames.
3113                          */
3114                         if (!multicast &&
3115                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3116                                 return 0;
3117                         if (ieee80211_is_public_action(hdr, skb->len))
3118                                 return 1;
3119                         if (!ieee80211_is_beacon(hdr->frame_control))
3120                                 return 0;
3121                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3122                 }
3123                 break;
3124         case NL80211_IFTYPE_WDS:
3125                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3126                         return 0;
3127                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3128                         return 0;
3129                 break;
3130         case NL80211_IFTYPE_P2P_DEVICE:
3131                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3132                     !ieee80211_is_probe_req(hdr->frame_control) &&
3133                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3134                     !ieee80211_is_beacon(hdr->frame_control))
3135                         return 0;
3136                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3137                     !multicast)
3138                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3139                 break;
3140         default:
3141                 /* should never get here */
3142                 WARN_ON_ONCE(1);
3143                 break;
3144         }
3145 
3146         return 1;
3147 }
3148 
3149 /*
3150  * This function returns whether or not the SKB
3151  * was destined for RX processing or not, which,
3152  * if consume is true, is equivalent to whether
3153  * or not the skb was consumed.
3154  */
3155 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3156                                             struct sk_buff *skb, bool consume)
3157 {
3158         struct ieee80211_local *local = rx->local;
3159         struct ieee80211_sub_if_data *sdata = rx->sdata;
3160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3161         struct ieee80211_hdr *hdr = (void *)skb->data;
3162         int prepares;
3163 
3164         rx->skb = skb;
3165         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3166         prepares = prepare_for_handlers(rx, hdr);
3167 
3168         if (!prepares)
3169                 return false;
3170 
3171         if (!consume) {
3172                 skb = skb_copy(skb, GFP_ATOMIC);
3173                 if (!skb) {
3174                         if (net_ratelimit())
3175                                 wiphy_debug(local->hw.wiphy,
3176                                         "failed to copy skb for %s\n",
3177                                         sdata->name);
3178                         return true;
3179                 }
3180 
3181                 rx->skb = skb;
3182         }
3183 
3184         ieee80211_invoke_rx_handlers(rx);
3185         return true;
3186 }
3187 
3188 /*
3189  * This is the actual Rx frames handler. as it blongs to Rx path it must
3190  * be called with rcu_read_lock protection.
3191  */
3192 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3193                                          struct sk_buff *skb)
3194 {
3195         struct ieee80211_local *local = hw_to_local(hw);
3196         struct ieee80211_sub_if_data *sdata;
3197         struct ieee80211_hdr *hdr;
3198         __le16 fc;
3199         struct ieee80211_rx_data rx;
3200         struct ieee80211_sub_if_data *prev;
3201         struct sta_info *sta, *tmp, *prev_sta;
3202         int err = 0;
3203 
3204         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3205         memset(&rx, 0, sizeof(rx));
3206         rx.skb = skb;
3207         rx.local = local;
3208 
3209         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3210                 local->dot11ReceivedFragmentCount++;
3211 
3212         if (ieee80211_is_mgmt(fc)) {
3213                 /* drop frame if too short for header */
3214                 if (skb->len < ieee80211_hdrlen(fc))
3215                         err = -ENOBUFS;
3216                 else
3217                         err = skb_linearize(skb);
3218         } else {
3219                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3220         }
3221 
3222         if (err) {
3223                 dev_kfree_skb(skb);
3224                 return;
3225         }
3226 
3227         hdr = (struct ieee80211_hdr *)skb->data;
3228         ieee80211_parse_qos(&rx);
3229         ieee80211_verify_alignment(&rx);
3230 
3231         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3232                      ieee80211_is_beacon(hdr->frame_control)))
3233                 ieee80211_scan_rx(local, skb);
3234 
3235         if (ieee80211_is_data(fc)) {
3236                 prev_sta = NULL;
3237 
3238                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3239                         if (!prev_sta) {
3240                                 prev_sta = sta;
3241                                 continue;
3242                         }
3243 
3244                         rx.sta = prev_sta;
3245                         rx.sdata = prev_sta->sdata;
3246                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3247 
3248                         prev_sta = sta;
3249                 }
3250 
3251                 if (prev_sta) {
3252                         rx.sta = prev_sta;
3253                         rx.sdata = prev_sta->sdata;
3254 
3255                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3256                                 return;
3257                         goto out;
3258                 }
3259         }
3260 
3261         prev = NULL;
3262 
3263         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3264                 if (!ieee80211_sdata_running(sdata))
3265                         continue;
3266 
3267                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3268                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3269                         continue;
3270 
3271                 /*
3272                  * frame is destined for this interface, but if it's
3273                  * not also for the previous one we handle that after
3274                  * the loop to avoid copying the SKB once too much
3275                  */
3276 
3277                 if (!prev) {
3278                         prev = sdata;
3279                         continue;
3280                 }
3281 
3282                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3283                 rx.sdata = prev;
3284                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3285 
3286                 prev = sdata;
3287         }
3288 
3289         if (prev) {
3290                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3291                 rx.sdata = prev;
3292 
3293                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3294                         return;
3295         }
3296 
3297  out:
3298         dev_kfree_skb(skb);
3299 }
3300 
3301 /*
3302  * This is the receive path handler. It is called by a low level driver when an
3303  * 802.11 MPDU is received from the hardware.
3304  */
3305 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3306 {
3307         struct ieee80211_local *local = hw_to_local(hw);
3308         struct ieee80211_rate *rate = NULL;
3309         struct ieee80211_supported_band *sband;
3310         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3311 
3312         WARN_ON_ONCE(softirq_count() == 0);
3313 
3314         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3315                 goto drop;
3316 
3317         sband = local->hw.wiphy->bands[status->band];
3318         if (WARN_ON(!sband))
3319                 goto drop;
3320 
3321         /*
3322          * If we're suspending, it is possible although not too likely
3323          * that we'd be receiving frames after having already partially
3324          * quiesced the stack. We can't process such frames then since
3325          * that might, for example, cause stations to be added or other
3326          * driver callbacks be invoked.
3327          */
3328         if (unlikely(local->quiescing || local->suspended))
3329                 goto drop;
3330 
3331         /* We might be during a HW reconfig, prevent Rx for the same reason */
3332         if (unlikely(local->in_reconfig))
3333                 goto drop;
3334 
3335         /*
3336          * The same happens when we're not even started,
3337          * but that's worth a warning.
3338          */
3339         if (WARN_ON(!local->started))
3340                 goto drop;
3341 
3342         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3343                 /*
3344                  * Validate the rate, unless a PLCP error means that
3345                  * we probably can't have a valid rate here anyway.
3346                  */
3347 
3348                 if (status->flag & RX_FLAG_HT) {
3349                         /*
3350                          * rate_idx is MCS index, which can be [0-76]
3351                          * as documented on:
3352                          *
3353                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3354                          *
3355                          * Anything else would be some sort of driver or
3356                          * hardware error. The driver should catch hardware
3357                          * errors.
3358                          */
3359                         if (WARN(status->rate_idx > 76,
3360                                  "Rate marked as an HT rate but passed "
3361                                  "status->rate_idx is not "
3362                                  "an MCS index [0-76]: %d (0x%02x)\n",
3363                                  status->rate_idx,
3364                                  status->rate_idx))
3365                                 goto drop;
3366                 } else if (status->flag & RX_FLAG_VHT) {
3367                         if (WARN_ONCE(status->rate_idx > 9 ||
3368                                       !status->vht_nss ||
3369                                       status->vht_nss > 8,
3370                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3371                                       status->rate_idx, status->vht_nss))
3372                                 goto drop;
3373                 } else {
3374                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3375                                 goto drop;
3376                         rate = &sband->bitrates[status->rate_idx];
3377                 }
3378         }
3379 
3380         status->rx_flags = 0;
3381 
3382         /*
3383          * key references and virtual interfaces are protected using RCU
3384          * and this requires that we are in a read-side RCU section during
3385          * receive processing
3386          */
3387         rcu_read_lock();
3388 
3389         /*
3390          * Frames with failed FCS/PLCP checksum are not returned,
3391          * all other frames are returned without radiotap header
3392          * if it was previously present.
3393          * Also, frames with less than 16 bytes are dropped.
3394          */
3395         skb = ieee80211_rx_monitor(local, skb, rate);
3396         if (!skb) {
3397                 rcu_read_unlock();
3398                 return;
3399         }
3400 
3401         ieee80211_tpt_led_trig_rx(local,
3402                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3403                         skb->len);
3404         __ieee80211_rx_handle_packet(hw, skb);
3405 
3406         rcu_read_unlock();
3407 
3408         return;
3409  drop:
3410         kfree_skb(skb);
3411 }
3412 EXPORT_SYMBOL(ieee80211_rx);
3413 
3414 /* This is a version of the rx handler that can be called from hard irq
3415  * context. Post the skb on the queue and schedule the tasklet */
3416 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3417 {
3418         struct ieee80211_local *local = hw_to_local(hw);
3419 
3420         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3421 
3422         skb->pkt_type = IEEE80211_RX_MSG;
3423         skb_queue_tail(&local->skb_queue, skb);
3424         tasklet_schedule(&local->tasklet);
3425 }
3426 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
3427 

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