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

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2005-2006, Devicescape Software, Inc.
  4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
  6  * Copyright 2013-2014  Intel Mobile Communications GmbH
  7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/jiffies.h>
 15 #include <linux/slab.h>
 16 #include <linux/kernel.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/etherdevice.h>
 20 #include <linux/rcupdate.h>
 21 #include <linux/export.h>
 22 #include <linux/bitops.h>
 23 #include <net/mac80211.h>
 24 #include <net/ieee80211_radiotap.h>
 25 #include <asm/unaligned.h>
 26 
 27 #include "ieee80211_i.h"
 28 #include "driver-ops.h"
 29 #include "led.h"
 30 #include "mesh.h"
 31 #include "wep.h"
 32 #include "wpa.h"
 33 #include "tkip.h"
 34 #include "wme.h"
 35 #include "rate.h"
 36 
 37 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
 38 {
 39         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 40 
 41         u64_stats_update_begin(&tstats->syncp);
 42         tstats->rx_packets++;
 43         tstats->rx_bytes += len;
 44         u64_stats_update_end(&tstats->syncp);
 45 }
 46 
 47 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
 48                                enum nl80211_iftype type)
 49 {
 50         __le16 fc = hdr->frame_control;
 51 
 52         if (ieee80211_is_data(fc)) {
 53                 if (len < 24) /* drop incorrect hdr len (data) */
 54                         return NULL;
 55 
 56                 if (ieee80211_has_a4(fc))
 57                         return NULL;
 58                 if (ieee80211_has_tods(fc))
 59                         return hdr->addr1;
 60                 if (ieee80211_has_fromds(fc))
 61                         return hdr->addr2;
 62 
 63                 return hdr->addr3;
 64         }
 65 
 66         if (ieee80211_is_mgmt(fc)) {
 67                 if (len < 24) /* drop incorrect hdr len (mgmt) */
 68                         return NULL;
 69                 return hdr->addr3;
 70         }
 71 
 72         if (ieee80211_is_ctl(fc)) {
 73                 if (ieee80211_is_pspoll(fc))
 74                         return hdr->addr1;
 75 
 76                 if (ieee80211_is_back_req(fc)) {
 77                         switch (type) {
 78                         case NL80211_IFTYPE_STATION:
 79                                 return hdr->addr2;
 80                         case NL80211_IFTYPE_AP:
 81                         case NL80211_IFTYPE_AP_VLAN:
 82                                 return hdr->addr1;
 83                         default:
 84                                 break; /* fall through to the return */
 85                         }
 86                 }
 87         }
 88 
 89         return NULL;
 90 }
 91 
 92 /*
 93  * monitor mode reception
 94  *
 95  * This function cleans up the SKB, i.e. it removes all the stuff
 96  * only useful for monitoring.
 97  */
 98 static void remove_monitor_info(struct sk_buff *skb,
 99                                 unsigned int present_fcs_len,
100                                 unsigned int rtap_vendor_space)
101 {
102         if (present_fcs_len)
103                 __pskb_trim(skb, skb->len - present_fcs_len);
104         __pskb_pull(skb, rtap_vendor_space);
105 }
106 
107 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
108                                      unsigned int rtap_vendor_space)
109 {
110         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
111         struct ieee80211_hdr *hdr;
112 
113         hdr = (void *)(skb->data + rtap_vendor_space);
114 
115         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
116                             RX_FLAG_FAILED_PLCP_CRC |
117                             RX_FLAG_ONLY_MONITOR))
118                 return true;
119 
120         if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
121                 return true;
122 
123         if (ieee80211_is_ctl(hdr->frame_control) &&
124             !ieee80211_is_pspoll(hdr->frame_control) &&
125             !ieee80211_is_back_req(hdr->frame_control))
126                 return true;
127 
128         return false;
129 }
130 
131 static int
132 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
133                              struct ieee80211_rx_status *status,
134                              struct sk_buff *skb)
135 {
136         int len;
137 
138         /* always present fields */
139         len = sizeof(struct ieee80211_radiotap_header) + 8;
140 
141         /* allocate extra bitmaps */
142         if (status->chains)
143                 len += 4 * hweight8(status->chains);
144 
145         if (ieee80211_have_rx_timestamp(status)) {
146                 len = ALIGN(len, 8);
147                 len += 8;
148         }
149         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
150                 len += 1;
151 
152         /* antenna field, if we don't have per-chain info */
153         if (!status->chains)
154                 len += 1;
155 
156         /* padding for RX_FLAGS if necessary */
157         len = ALIGN(len, 2);
158 
159         if (status->encoding == RX_ENC_HT) /* HT info */
160                 len += 3;
161 
162         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
163                 len = ALIGN(len, 4);
164                 len += 8;
165         }
166 
167         if (status->encoding == RX_ENC_VHT) {
168                 len = ALIGN(len, 2);
169                 len += 12;
170         }
171 
172         if (local->hw.radiotap_timestamp.units_pos >= 0) {
173                 len = ALIGN(len, 8);
174                 len += 12;
175         }
176 
177         if (status->chains) {
178                 /* antenna and antenna signal fields */
179                 len += 2 * hweight8(status->chains);
180         }
181 
182         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
183                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
184 
185                 /* vendor presence bitmap */
186                 len += 4;
187                 /* alignment for fixed 6-byte vendor data header */
188                 len = ALIGN(len, 2);
189                 /* vendor data header */
190                 len += 6;
191                 if (WARN_ON(rtap->align == 0))
192                         rtap->align = 1;
193                 len = ALIGN(len, rtap->align);
194                 len += rtap->len + rtap->pad;
195         }
196 
197         return len;
198 }
199 
200 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
201                                          struct sk_buff *skb,
202                                          int rtap_vendor_space)
203 {
204         struct {
205                 struct ieee80211_hdr_3addr hdr;
206                 u8 category;
207                 u8 action_code;
208         } __packed action;
209 
210         if (!sdata)
211                 return;
212 
213         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
214 
215         if (skb->len < rtap_vendor_space + sizeof(action) +
216                        VHT_MUMIMO_GROUPS_DATA_LEN)
217                 return;
218 
219         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
220                 return;
221 
222         skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
223 
224         if (!ieee80211_is_action(action.hdr.frame_control))
225                 return;
226 
227         if (action.category != WLAN_CATEGORY_VHT)
228                 return;
229 
230         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
231                 return;
232 
233         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
234                 return;
235 
236         skb = skb_copy(skb, GFP_ATOMIC);
237         if (!skb)
238                 return;
239 
240         skb_queue_tail(&sdata->skb_queue, skb);
241         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
242 }
243 
244 /*
245  * ieee80211_add_rx_radiotap_header - add radiotap header
246  *
247  * add a radiotap header containing all the fields which the hardware provided.
248  */
249 static void
250 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
251                                  struct sk_buff *skb,
252                                  struct ieee80211_rate *rate,
253                                  int rtap_len, bool has_fcs)
254 {
255         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
256         struct ieee80211_radiotap_header *rthdr;
257         unsigned char *pos;
258         __le32 *it_present;
259         u32 it_present_val;
260         u16 rx_flags = 0;
261         u16 channel_flags = 0;
262         int mpdulen, chain;
263         unsigned long chains = status->chains;
264         struct ieee80211_vendor_radiotap rtap = {};
265 
266         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
267                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
268                 /* rtap.len and rtap.pad are undone immediately */
269                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
270         }
271 
272         mpdulen = skb->len;
273         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
274                 mpdulen += FCS_LEN;
275 
276         rthdr = skb_push(skb, rtap_len);
277         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
278         it_present = &rthdr->it_present;
279 
280         /* radiotap header, set always present flags */
281         rthdr->it_len = cpu_to_le16(rtap_len);
282         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
283                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
284                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
285 
286         if (!status->chains)
287                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
288 
289         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
290                 it_present_val |=
291                         BIT(IEEE80211_RADIOTAP_EXT) |
292                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
293                 put_unaligned_le32(it_present_val, it_present);
294                 it_present++;
295                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
296                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
297         }
298 
299         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
300                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
301                                   BIT(IEEE80211_RADIOTAP_EXT);
302                 put_unaligned_le32(it_present_val, it_present);
303                 it_present++;
304                 it_present_val = rtap.present;
305         }
306 
307         put_unaligned_le32(it_present_val, it_present);
308 
309         pos = (void *)(it_present + 1);
310 
311         /* the order of the following fields is important */
312 
313         /* IEEE80211_RADIOTAP_TSFT */
314         if (ieee80211_have_rx_timestamp(status)) {
315                 /* padding */
316                 while ((pos - (u8 *)rthdr) & 7)
317                         *pos++ = 0;
318                 put_unaligned_le64(
319                         ieee80211_calculate_rx_timestamp(local, status,
320                                                          mpdulen, 0),
321                         pos);
322                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
323                 pos += 8;
324         }
325 
326         /* IEEE80211_RADIOTAP_FLAGS */
327         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
328                 *pos |= IEEE80211_RADIOTAP_F_FCS;
329         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
330                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
331         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
332                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
333         pos++;
334 
335         /* IEEE80211_RADIOTAP_RATE */
336         if (!rate || status->encoding != RX_ENC_LEGACY) {
337                 /*
338                  * Without rate information don't add it. If we have,
339                  * MCS information is a separate field in radiotap,
340                  * added below. The byte here is needed as padding
341                  * for the channel though, so initialise it to 0.
342                  */
343                 *pos = 0;
344         } else {
345                 int shift = 0;
346                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
347                 if (status->bw == RATE_INFO_BW_10)
348                         shift = 1;
349                 else if (status->bw == RATE_INFO_BW_5)
350                         shift = 2;
351                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
352         }
353         pos++;
354 
355         /* IEEE80211_RADIOTAP_CHANNEL */
356         put_unaligned_le16(status->freq, pos);
357         pos += 2;
358         if (status->bw == RATE_INFO_BW_10)
359                 channel_flags |= IEEE80211_CHAN_HALF;
360         else if (status->bw == RATE_INFO_BW_5)
361                 channel_flags |= IEEE80211_CHAN_QUARTER;
362 
363         if (status->band == NL80211_BAND_5GHZ)
364                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
365         else if (status->encoding != RX_ENC_LEGACY)
366                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
367         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
368                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
369         else if (rate)
370                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
371         else
372                 channel_flags |= IEEE80211_CHAN_2GHZ;
373         put_unaligned_le16(channel_flags, pos);
374         pos += 2;
375 
376         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
377         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
378             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
379                 *pos = status->signal;
380                 rthdr->it_present |=
381                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
382                 pos++;
383         }
384 
385         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
386 
387         if (!status->chains) {
388                 /* IEEE80211_RADIOTAP_ANTENNA */
389                 *pos = status->antenna;
390                 pos++;
391         }
392 
393         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
394 
395         /* IEEE80211_RADIOTAP_RX_FLAGS */
396         /* ensure 2 byte alignment for the 2 byte field as required */
397         if ((pos - (u8 *)rthdr) & 1)
398                 *pos++ = 0;
399         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
400                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
401         put_unaligned_le16(rx_flags, pos);
402         pos += 2;
403 
404         if (status->encoding == RX_ENC_HT) {
405                 unsigned int stbc;
406 
407                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
408                 *pos++ = local->hw.radiotap_mcs_details;
409                 *pos = 0;
410                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
411                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
412                 if (status->bw == RATE_INFO_BW_40)
413                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
414                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
415                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
416                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
417                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
418                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
419                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
420                 pos++;
421                 *pos++ = status->rate_idx;
422         }
423 
424         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
425                 u16 flags = 0;
426 
427                 /* ensure 4 byte alignment */
428                 while ((pos - (u8 *)rthdr) & 3)
429                         pos++;
430                 rthdr->it_present |=
431                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
432                 put_unaligned_le32(status->ampdu_reference, pos);
433                 pos += 4;
434                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
435                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
436                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
437                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
438                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
439                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
440                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
441                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
442                 put_unaligned_le16(flags, pos);
443                 pos += 2;
444                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
445                         *pos++ = status->ampdu_delimiter_crc;
446                 else
447                         *pos++ = 0;
448                 *pos++ = 0;
449         }
450 
451         if (status->encoding == RX_ENC_VHT) {
452                 u16 known = local->hw.radiotap_vht_details;
453 
454                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
455                 put_unaligned_le16(known, pos);
456                 pos += 2;
457                 /* flags */
458                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
459                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
460                 /* in VHT, STBC is binary */
461                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
462                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
463                 if (status->enc_flags & RX_ENC_FLAG_BF)
464                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
465                 pos++;
466                 /* bandwidth */
467                 switch (status->bw) {
468                 case RATE_INFO_BW_80:
469                         *pos++ = 4;
470                         break;
471                 case RATE_INFO_BW_160:
472                         *pos++ = 11;
473                         break;
474                 case RATE_INFO_BW_40:
475                         *pos++ = 1;
476                         break;
477                 default:
478                         *pos++ = 0;
479                 }
480                 /* MCS/NSS */
481                 *pos = (status->rate_idx << 4) | status->nss;
482                 pos += 4;
483                 /* coding field */
484                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
485                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
486                 pos++;
487                 /* group ID */
488                 pos++;
489                 /* partial_aid */
490                 pos += 2;
491         }
492 
493         if (local->hw.radiotap_timestamp.units_pos >= 0) {
494                 u16 accuracy = 0;
495                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
496 
497                 rthdr->it_present |=
498                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
499 
500                 /* ensure 8 byte alignment */
501                 while ((pos - (u8 *)rthdr) & 7)
502                         pos++;
503 
504                 put_unaligned_le64(status->device_timestamp, pos);
505                 pos += sizeof(u64);
506 
507                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
508                         accuracy = local->hw.radiotap_timestamp.accuracy;
509                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
510                 }
511                 put_unaligned_le16(accuracy, pos);
512                 pos += sizeof(u16);
513 
514                 *pos++ = local->hw.radiotap_timestamp.units_pos;
515                 *pos++ = flags;
516         }
517 
518         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
519                 *pos++ = status->chain_signal[chain];
520                 *pos++ = chain;
521         }
522 
523         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
524                 /* ensure 2 byte alignment for the vendor field as required */
525                 if ((pos - (u8 *)rthdr) & 1)
526                         *pos++ = 0;
527                 *pos++ = rtap.oui[0];
528                 *pos++ = rtap.oui[1];
529                 *pos++ = rtap.oui[2];
530                 *pos++ = rtap.subns;
531                 put_unaligned_le16(rtap.len, pos);
532                 pos += 2;
533                 /* align the actual payload as requested */
534                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
535                         *pos++ = 0;
536                 /* data (and possible padding) already follows */
537         }
538 }
539 
540 static struct sk_buff *
541 ieee80211_make_monitor_skb(struct ieee80211_local *local,
542                            struct sk_buff **origskb,
543                            struct ieee80211_rate *rate,
544                            int rtap_vendor_space, bool use_origskb)
545 {
546         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
547         int rt_hdrlen, needed_headroom;
548         struct sk_buff *skb;
549 
550         /* room for the radiotap header based on driver features */
551         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
552         needed_headroom = rt_hdrlen - rtap_vendor_space;
553 
554         if (use_origskb) {
555                 /* only need to expand headroom if necessary */
556                 skb = *origskb;
557                 *origskb = NULL;
558 
559                 /*
560                  * This shouldn't trigger often because most devices have an
561                  * RX header they pull before we get here, and that should
562                  * be big enough for our radiotap information. We should
563                  * probably export the length to drivers so that we can have
564                  * them allocate enough headroom to start with.
565                  */
566                 if (skb_headroom(skb) < needed_headroom &&
567                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
568                         dev_kfree_skb(skb);
569                         return NULL;
570                 }
571         } else {
572                 /*
573                  * Need to make a copy and possibly remove radiotap header
574                  * and FCS from the original.
575                  */
576                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
577 
578                 if (!skb)
579                         return NULL;
580         }
581 
582         /* prepend radiotap information */
583         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
584 
585         skb_reset_mac_header(skb);
586         skb->ip_summed = CHECKSUM_UNNECESSARY;
587         skb->pkt_type = PACKET_OTHERHOST;
588         skb->protocol = htons(ETH_P_802_2);
589 
590         return skb;
591 }
592 
593 /*
594  * This function copies a received frame to all monitor interfaces and
595  * returns a cleaned-up SKB that no longer includes the FCS nor the
596  * radiotap header the driver might have added.
597  */
598 static struct sk_buff *
599 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
600                      struct ieee80211_rate *rate)
601 {
602         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
603         struct ieee80211_sub_if_data *sdata;
604         struct sk_buff *monskb = NULL;
605         int present_fcs_len = 0;
606         unsigned int rtap_vendor_space = 0;
607         struct ieee80211_sub_if_data *monitor_sdata =
608                 rcu_dereference(local->monitor_sdata);
609         bool only_monitor = false;
610 
611         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
612                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
613 
614                 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
615         }
616 
617         /*
618          * First, we may need to make a copy of the skb because
619          *  (1) we need to modify it for radiotap (if not present), and
620          *  (2) the other RX handlers will modify the skb we got.
621          *
622          * We don't need to, of course, if we aren't going to return
623          * the SKB because it has a bad FCS/PLCP checksum.
624          */
625 
626         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
627                 if (unlikely(origskb->len <= FCS_LEN)) {
628                         /* driver bug */
629                         WARN_ON(1);
630                         dev_kfree_skb(origskb);
631                         return NULL;
632                 }
633                 present_fcs_len = FCS_LEN;
634         }
635 
636         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
637         if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
638                 dev_kfree_skb(origskb);
639                 return NULL;
640         }
641 
642         only_monitor = should_drop_frame(origskb, present_fcs_len,
643                                          rtap_vendor_space);
644 
645         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
646                 if (only_monitor) {
647                         dev_kfree_skb(origskb);
648                         return NULL;
649                 }
650 
651                 remove_monitor_info(origskb, present_fcs_len,
652                                     rtap_vendor_space);
653                 return origskb;
654         }
655 
656         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
657 
658         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
659                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
660                                                  &local->mon_list);
661 
662                 if (!monskb)
663                         monskb = ieee80211_make_monitor_skb(local, &origskb,
664                                                             rate,
665                                                             rtap_vendor_space,
666                                                             only_monitor &&
667                                                             last_monitor);
668 
669                 if (monskb) {
670                         struct sk_buff *skb;
671 
672                         if (last_monitor) {
673                                 skb = monskb;
674                                 monskb = NULL;
675                         } else {
676                                 skb = skb_clone(monskb, GFP_ATOMIC);
677                         }
678 
679                         if (skb) {
680                                 skb->dev = sdata->dev;
681                                 ieee80211_rx_stats(skb->dev, skb->len);
682                                 netif_receive_skb(skb);
683                         }
684                 }
685 
686                 if (last_monitor)
687                         break;
688         }
689 
690         /* this happens if last_monitor was erroneously false */
691         dev_kfree_skb(monskb);
692 
693         /* ditto */
694         if (!origskb)
695                 return NULL;
696 
697         remove_monitor_info(origskb, present_fcs_len, rtap_vendor_space);
698         return origskb;
699 }
700 
701 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
702 {
703         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
704         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
705         int tid, seqno_idx, security_idx;
706 
707         /* does the frame have a qos control field? */
708         if (ieee80211_is_data_qos(hdr->frame_control)) {
709                 u8 *qc = ieee80211_get_qos_ctl(hdr);
710                 /* frame has qos control */
711                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
712                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
713                         status->rx_flags |= IEEE80211_RX_AMSDU;
714 
715                 seqno_idx = tid;
716                 security_idx = tid;
717         } else {
718                 /*
719                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
720                  *
721                  *      Sequence numbers for management frames, QoS data
722                  *      frames with a broadcast/multicast address in the
723                  *      Address 1 field, and all non-QoS data frames sent
724                  *      by QoS STAs are assigned using an additional single
725                  *      modulo-4096 counter, [...]
726                  *
727                  * We also use that counter for non-QoS STAs.
728                  */
729                 seqno_idx = IEEE80211_NUM_TIDS;
730                 security_idx = 0;
731                 if (ieee80211_is_mgmt(hdr->frame_control))
732                         security_idx = IEEE80211_NUM_TIDS;
733                 tid = 0;
734         }
735 
736         rx->seqno_idx = seqno_idx;
737         rx->security_idx = security_idx;
738         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
739          * For now, set skb->priority to 0 for other cases. */
740         rx->skb->priority = (tid > 7) ? 0 : tid;
741 }
742 
743 /**
744  * DOC: Packet alignment
745  *
746  * Drivers always need to pass packets that are aligned to two-byte boundaries
747  * to the stack.
748  *
749  * Additionally, should, if possible, align the payload data in a way that
750  * guarantees that the contained IP header is aligned to a four-byte
751  * boundary. In the case of regular frames, this simply means aligning the
752  * payload to a four-byte boundary (because either the IP header is directly
753  * contained, or IV/RFC1042 headers that have a length divisible by four are
754  * in front of it).  If the payload data is not properly aligned and the
755  * architecture doesn't support efficient unaligned operations, mac80211
756  * will align the data.
757  *
758  * With A-MSDU frames, however, the payload data address must yield two modulo
759  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
760  * push the IP header further back to a multiple of four again. Thankfully, the
761  * specs were sane enough this time around to require padding each A-MSDU
762  * subframe to a length that is a multiple of four.
763  *
764  * Padding like Atheros hardware adds which is between the 802.11 header and
765  * the payload is not supported, the driver is required to move the 802.11
766  * header to be directly in front of the payload in that case.
767  */
768 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
769 {
770 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
771         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
772 #endif
773 }
774 
775 
776 /* rx handlers */
777 
778 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
779 {
780         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
781 
782         if (is_multicast_ether_addr(hdr->addr1))
783                 return 0;
784 
785         return ieee80211_is_robust_mgmt_frame(skb);
786 }
787 
788 
789 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
790 {
791         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
792 
793         if (!is_multicast_ether_addr(hdr->addr1))
794                 return 0;
795 
796         return ieee80211_is_robust_mgmt_frame(skb);
797 }
798 
799 
800 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
801 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
802 {
803         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
804         struct ieee80211_mmie *mmie;
805         struct ieee80211_mmie_16 *mmie16;
806 
807         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
808                 return -1;
809 
810         if (!ieee80211_is_robust_mgmt_frame(skb))
811                 return -1; /* not a robust management frame */
812 
813         mmie = (struct ieee80211_mmie *)
814                 (skb->data + skb->len - sizeof(*mmie));
815         if (mmie->element_id == WLAN_EID_MMIE &&
816             mmie->length == sizeof(*mmie) - 2)
817                 return le16_to_cpu(mmie->key_id);
818 
819         mmie16 = (struct ieee80211_mmie_16 *)
820                 (skb->data + skb->len - sizeof(*mmie16));
821         if (skb->len >= 24 + sizeof(*mmie16) &&
822             mmie16->element_id == WLAN_EID_MMIE &&
823             mmie16->length == sizeof(*mmie16) - 2)
824                 return le16_to_cpu(mmie16->key_id);
825 
826         return -1;
827 }
828 
829 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
830                                   struct sk_buff *skb)
831 {
832         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
833         __le16 fc;
834         int hdrlen;
835         u8 keyid;
836 
837         fc = hdr->frame_control;
838         hdrlen = ieee80211_hdrlen(fc);
839 
840         if (skb->len < hdrlen + cs->hdr_len)
841                 return -EINVAL;
842 
843         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
844         keyid &= cs->key_idx_mask;
845         keyid >>= cs->key_idx_shift;
846 
847         return keyid;
848 }
849 
850 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
851 {
852         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
853         char *dev_addr = rx->sdata->vif.addr;
854 
855         if (ieee80211_is_data(hdr->frame_control)) {
856                 if (is_multicast_ether_addr(hdr->addr1)) {
857                         if (ieee80211_has_tods(hdr->frame_control) ||
858                             !ieee80211_has_fromds(hdr->frame_control))
859                                 return RX_DROP_MONITOR;
860                         if (ether_addr_equal(hdr->addr3, dev_addr))
861                                 return RX_DROP_MONITOR;
862                 } else {
863                         if (!ieee80211_has_a4(hdr->frame_control))
864                                 return RX_DROP_MONITOR;
865                         if (ether_addr_equal(hdr->addr4, dev_addr))
866                                 return RX_DROP_MONITOR;
867                 }
868         }
869 
870         /* If there is not an established peer link and this is not a peer link
871          * establisment frame, beacon or probe, drop the frame.
872          */
873 
874         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
875                 struct ieee80211_mgmt *mgmt;
876 
877                 if (!ieee80211_is_mgmt(hdr->frame_control))
878                         return RX_DROP_MONITOR;
879 
880                 if (ieee80211_is_action(hdr->frame_control)) {
881                         u8 category;
882 
883                         /* make sure category field is present */
884                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
885                                 return RX_DROP_MONITOR;
886 
887                         mgmt = (struct ieee80211_mgmt *)hdr;
888                         category = mgmt->u.action.category;
889                         if (category != WLAN_CATEGORY_MESH_ACTION &&
890                             category != WLAN_CATEGORY_SELF_PROTECTED)
891                                 return RX_DROP_MONITOR;
892                         return RX_CONTINUE;
893                 }
894 
895                 if (ieee80211_is_probe_req(hdr->frame_control) ||
896                     ieee80211_is_probe_resp(hdr->frame_control) ||
897                     ieee80211_is_beacon(hdr->frame_control) ||
898                     ieee80211_is_auth(hdr->frame_control))
899                         return RX_CONTINUE;
900 
901                 return RX_DROP_MONITOR;
902         }
903 
904         return RX_CONTINUE;
905 }
906 
907 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
908                                               int index)
909 {
910         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
911         struct sk_buff *tail = skb_peek_tail(frames);
912         struct ieee80211_rx_status *status;
913 
914         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
915                 return true;
916 
917         if (!tail)
918                 return false;
919 
920         status = IEEE80211_SKB_RXCB(tail);
921         if (status->flag & RX_FLAG_AMSDU_MORE)
922                 return false;
923 
924         return true;
925 }
926 
927 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
928                                             struct tid_ampdu_rx *tid_agg_rx,
929                                             int index,
930                                             struct sk_buff_head *frames)
931 {
932         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
933         struct sk_buff *skb;
934         struct ieee80211_rx_status *status;
935 
936         lockdep_assert_held(&tid_agg_rx->reorder_lock);
937 
938         if (skb_queue_empty(skb_list))
939                 goto no_frame;
940 
941         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
942                 __skb_queue_purge(skb_list);
943                 goto no_frame;
944         }
945 
946         /* release frames from the reorder ring buffer */
947         tid_agg_rx->stored_mpdu_num--;
948         while ((skb = __skb_dequeue(skb_list))) {
949                 status = IEEE80211_SKB_RXCB(skb);
950                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
951                 __skb_queue_tail(frames, skb);
952         }
953 
954 no_frame:
955         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
956         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
957 }
958 
959 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
960                                              struct tid_ampdu_rx *tid_agg_rx,
961                                              u16 head_seq_num,
962                                              struct sk_buff_head *frames)
963 {
964         int index;
965 
966         lockdep_assert_held(&tid_agg_rx->reorder_lock);
967 
968         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
969                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
970                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
971                                                 frames);
972         }
973 }
974 
975 /*
976  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
977  * the skb was added to the buffer longer than this time ago, the earlier
978  * frames that have not yet been received are assumed to be lost and the skb
979  * can be released for processing. This may also release other skb's from the
980  * reorder buffer if there are no additional gaps between the frames.
981  *
982  * Callers must hold tid_agg_rx->reorder_lock.
983  */
984 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
985 
986 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
987                                           struct tid_ampdu_rx *tid_agg_rx,
988                                           struct sk_buff_head *frames)
989 {
990         int index, i, j;
991 
992         lockdep_assert_held(&tid_agg_rx->reorder_lock);
993 
994         /* release the buffer until next missing frame */
995         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
996         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
997             tid_agg_rx->stored_mpdu_num) {
998                 /*
999                  * No buffers ready to be released, but check whether any
1000                  * frames in the reorder buffer have timed out.
1001                  */
1002                 int skipped = 1;
1003                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1004                      j = (j + 1) % tid_agg_rx->buf_size) {
1005                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1006                                 skipped++;
1007                                 continue;
1008                         }
1009                         if (skipped &&
1010                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1011                                         HT_RX_REORDER_BUF_TIMEOUT))
1012                                 goto set_release_timer;
1013 
1014                         /* don't leave incomplete A-MSDUs around */
1015                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1016                              i = (i + 1) % tid_agg_rx->buf_size)
1017                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1018 
1019                         ht_dbg_ratelimited(sdata,
1020                                            "release an RX reorder frame due to timeout on earlier frames\n");
1021                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1022                                                         frames);
1023 
1024                         /*
1025                          * Increment the head seq# also for the skipped slots.
1026                          */
1027                         tid_agg_rx->head_seq_num =
1028                                 (tid_agg_rx->head_seq_num +
1029                                  skipped) & IEEE80211_SN_MASK;
1030                         skipped = 0;
1031                 }
1032         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1033                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1034                                                 frames);
1035                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1036         }
1037 
1038         if (tid_agg_rx->stored_mpdu_num) {
1039                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1040 
1041                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1042                      j = (j + 1) % tid_agg_rx->buf_size) {
1043                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1044                                 break;
1045                 }
1046 
1047  set_release_timer:
1048 
1049                 if (!tid_agg_rx->removed)
1050                         mod_timer(&tid_agg_rx->reorder_timer,
1051                                   tid_agg_rx->reorder_time[j] + 1 +
1052                                   HT_RX_REORDER_BUF_TIMEOUT);
1053         } else {
1054                 del_timer(&tid_agg_rx->reorder_timer);
1055         }
1056 }
1057 
1058 /*
1059  * As this function belongs to the RX path it must be under
1060  * rcu_read_lock protection. It returns false if the frame
1061  * can be processed immediately, true if it was consumed.
1062  */
1063 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1064                                              struct tid_ampdu_rx *tid_agg_rx,
1065                                              struct sk_buff *skb,
1066                                              struct sk_buff_head *frames)
1067 {
1068         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1069         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1070         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1071         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1072         u16 head_seq_num, buf_size;
1073         int index;
1074         bool ret = true;
1075 
1076         spin_lock(&tid_agg_rx->reorder_lock);
1077 
1078         /*
1079          * Offloaded BA sessions have no known starting sequence number so pick
1080          * one from first Rxed frame for this tid after BA was started.
1081          */
1082         if (unlikely(tid_agg_rx->auto_seq)) {
1083                 tid_agg_rx->auto_seq = false;
1084                 tid_agg_rx->ssn = mpdu_seq_num;
1085                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1086         }
1087 
1088         buf_size = tid_agg_rx->buf_size;
1089         head_seq_num = tid_agg_rx->head_seq_num;
1090 
1091         /*
1092          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1093          * be reordered.
1094          */
1095         if (unlikely(!tid_agg_rx->started)) {
1096                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1097                         ret = false;
1098                         goto out;
1099                 }
1100                 tid_agg_rx->started = true;
1101         }
1102 
1103         /* frame with out of date sequence number */
1104         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1105                 dev_kfree_skb(skb);
1106                 goto out;
1107         }
1108 
1109         /*
1110          * If frame the sequence number exceeds our buffering window
1111          * size release some previous frames to make room for this one.
1112          */
1113         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1114                 head_seq_num = ieee80211_sn_inc(
1115                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1116                 /* release stored frames up to new head to stack */
1117                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1118                                                  head_seq_num, frames);
1119         }
1120 
1121         /* Now the new frame is always in the range of the reordering buffer */
1122 
1123         index = mpdu_seq_num % tid_agg_rx->buf_size;
1124 
1125         /* check if we already stored this frame */
1126         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1127                 dev_kfree_skb(skb);
1128                 goto out;
1129         }
1130 
1131         /*
1132          * If the current MPDU is in the right order and nothing else
1133          * is stored we can process it directly, no need to buffer it.
1134          * If it is first but there's something stored, we may be able
1135          * to release frames after this one.
1136          */
1137         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1138             tid_agg_rx->stored_mpdu_num == 0) {
1139                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1140                         tid_agg_rx->head_seq_num =
1141                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1142                 ret = false;
1143                 goto out;
1144         }
1145 
1146         /* put the frame in the reordering buffer */
1147         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1148         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1149                 tid_agg_rx->reorder_time[index] = jiffies;
1150                 tid_agg_rx->stored_mpdu_num++;
1151                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1152         }
1153 
1154  out:
1155         spin_unlock(&tid_agg_rx->reorder_lock);
1156         return ret;
1157 }
1158 
1159 /*
1160  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1161  * true if the MPDU was buffered, false if it should be processed.
1162  */
1163 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1164                                        struct sk_buff_head *frames)
1165 {
1166         struct sk_buff *skb = rx->skb;
1167         struct ieee80211_local *local = rx->local;
1168         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1169         struct sta_info *sta = rx->sta;
1170         struct tid_ampdu_rx *tid_agg_rx;
1171         u16 sc;
1172         u8 tid, ack_policy;
1173 
1174         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1175             is_multicast_ether_addr(hdr->addr1))
1176                 goto dont_reorder;
1177 
1178         /*
1179          * filter the QoS data rx stream according to
1180          * STA/TID and check if this STA/TID is on aggregation
1181          */
1182 
1183         if (!sta)
1184                 goto dont_reorder;
1185 
1186         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1187                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1188         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1189 
1190         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1191         if (!tid_agg_rx) {
1192                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1193                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1194                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1195                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1196                                              WLAN_BACK_RECIPIENT,
1197                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1198                 goto dont_reorder;
1199         }
1200 
1201         /* qos null data frames are excluded */
1202         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1203                 goto dont_reorder;
1204 
1205         /* not part of a BA session */
1206         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1207             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1208                 goto dont_reorder;
1209 
1210         /* new, potentially un-ordered, ampdu frame - process it */
1211 
1212         /* reset session timer */
1213         if (tid_agg_rx->timeout)
1214                 tid_agg_rx->last_rx = jiffies;
1215 
1216         /* if this mpdu is fragmented - terminate rx aggregation session */
1217         sc = le16_to_cpu(hdr->seq_ctrl);
1218         if (sc & IEEE80211_SCTL_FRAG) {
1219                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1220                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1221                 return;
1222         }
1223 
1224         /*
1225          * No locking needed -- we will only ever process one
1226          * RX packet at a time, and thus own tid_agg_rx. All
1227          * other code manipulating it needs to (and does) make
1228          * sure that we cannot get to it any more before doing
1229          * anything with it.
1230          */
1231         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1232                                              frames))
1233                 return;
1234 
1235  dont_reorder:
1236         __skb_queue_tail(frames, skb);
1237 }
1238 
1239 static ieee80211_rx_result debug_noinline
1240 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1241 {
1242         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1243         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1244 
1245         if (status->flag & RX_FLAG_DUP_VALIDATED)
1246                 return RX_CONTINUE;
1247 
1248         /*
1249          * Drop duplicate 802.11 retransmissions
1250          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1251          */
1252 
1253         if (rx->skb->len < 24)
1254                 return RX_CONTINUE;
1255 
1256         if (ieee80211_is_ctl(hdr->frame_control) ||
1257             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1258             is_multicast_ether_addr(hdr->addr1))
1259                 return RX_CONTINUE;
1260 
1261         if (!rx->sta)
1262                 return RX_CONTINUE;
1263 
1264         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1265                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1266                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1267                 rx->sta->rx_stats.num_duplicates++;
1268                 return RX_DROP_UNUSABLE;
1269         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1270                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1271         }
1272 
1273         return RX_CONTINUE;
1274 }
1275 
1276 static ieee80211_rx_result debug_noinline
1277 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1278 {
1279         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1280 
1281         /* Drop disallowed frame classes based on STA auth/assoc state;
1282          * IEEE 802.11, Chap 5.5.
1283          *
1284          * mac80211 filters only based on association state, i.e. it drops
1285          * Class 3 frames from not associated stations. hostapd sends
1286          * deauth/disassoc frames when needed. In addition, hostapd is
1287          * responsible for filtering on both auth and assoc states.
1288          */
1289 
1290         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1291                 return ieee80211_rx_mesh_check(rx);
1292 
1293         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1294                       ieee80211_is_pspoll(hdr->frame_control)) &&
1295                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1296                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1297                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1298                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1299                 /*
1300                  * accept port control frames from the AP even when it's not
1301                  * yet marked ASSOC to prevent a race where we don't set the
1302                  * assoc bit quickly enough before it sends the first frame
1303                  */
1304                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1305                     ieee80211_is_data_present(hdr->frame_control)) {
1306                         unsigned int hdrlen;
1307                         __be16 ethertype;
1308 
1309                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1310 
1311                         if (rx->skb->len < hdrlen + 8)
1312                                 return RX_DROP_MONITOR;
1313 
1314                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1315                         if (ethertype == rx->sdata->control_port_protocol)
1316                                 return RX_CONTINUE;
1317                 }
1318 
1319                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1320                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1321                                                hdr->addr2,
1322                                                GFP_ATOMIC))
1323                         return RX_DROP_UNUSABLE;
1324 
1325                 return RX_DROP_MONITOR;
1326         }
1327 
1328         return RX_CONTINUE;
1329 }
1330 
1331 
1332 static ieee80211_rx_result debug_noinline
1333 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1334 {
1335         struct ieee80211_local *local;
1336         struct ieee80211_hdr *hdr;
1337         struct sk_buff *skb;
1338 
1339         local = rx->local;
1340         skb = rx->skb;
1341         hdr = (struct ieee80211_hdr *) skb->data;
1342 
1343         if (!local->pspolling)
1344                 return RX_CONTINUE;
1345 
1346         if (!ieee80211_has_fromds(hdr->frame_control))
1347                 /* this is not from AP */
1348                 return RX_CONTINUE;
1349 
1350         if (!ieee80211_is_data(hdr->frame_control))
1351                 return RX_CONTINUE;
1352 
1353         if (!ieee80211_has_moredata(hdr->frame_control)) {
1354                 /* AP has no more frames buffered for us */
1355                 local->pspolling = false;
1356                 return RX_CONTINUE;
1357         }
1358 
1359         /* more data bit is set, let's request a new frame from the AP */
1360         ieee80211_send_pspoll(local, rx->sdata);
1361 
1362         return RX_CONTINUE;
1363 }
1364 
1365 static void sta_ps_start(struct sta_info *sta)
1366 {
1367         struct ieee80211_sub_if_data *sdata = sta->sdata;
1368         struct ieee80211_local *local = sdata->local;
1369         struct ps_data *ps;
1370         int tid;
1371 
1372         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1373             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1374                 ps = &sdata->bss->ps;
1375         else
1376                 return;
1377 
1378         atomic_inc(&ps->num_sta_ps);
1379         set_sta_flag(sta, WLAN_STA_PS_STA);
1380         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1381                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1382         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1383                sta->sta.addr, sta->sta.aid);
1384 
1385         ieee80211_clear_fast_xmit(sta);
1386 
1387         if (!sta->sta.txq[0])
1388                 return;
1389 
1390         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1391                 if (txq_has_queue(sta->sta.txq[tid]))
1392                         set_bit(tid, &sta->txq_buffered_tids);
1393                 else
1394                         clear_bit(tid, &sta->txq_buffered_tids);
1395         }
1396 }
1397 
1398 static void sta_ps_end(struct sta_info *sta)
1399 {
1400         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1401                sta->sta.addr, sta->sta.aid);
1402 
1403         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1404                 /*
1405                  * Clear the flag only if the other one is still set
1406                  * so that the TX path won't start TX'ing new frames
1407                  * directly ... In the case that the driver flag isn't
1408                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1409                  */
1410                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1411                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1412                        sta->sta.addr, sta->sta.aid);
1413                 return;
1414         }
1415 
1416         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1417         clear_sta_flag(sta, WLAN_STA_PS_STA);
1418         ieee80211_sta_ps_deliver_wakeup(sta);
1419 }
1420 
1421 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1422 {
1423         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1424         bool in_ps;
1425 
1426         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1427 
1428         /* Don't let the same PS state be set twice */
1429         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1430         if ((start && in_ps) || (!start && !in_ps))
1431                 return -EINVAL;
1432 
1433         if (start)
1434                 sta_ps_start(sta);
1435         else
1436                 sta_ps_end(sta);
1437 
1438         return 0;
1439 }
1440 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1441 
1442 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1443 {
1444         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1445 
1446         if (test_sta_flag(sta, WLAN_STA_SP))
1447                 return;
1448 
1449         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1450                 ieee80211_sta_ps_deliver_poll_response(sta);
1451         else
1452                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1453 }
1454 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1455 
1456 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1457 {
1458         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1459         int ac = ieee80211_ac_from_tid(tid);
1460 
1461         /*
1462          * If this AC is not trigger-enabled do nothing unless the
1463          * driver is calling us after it already checked.
1464          *
1465          * NB: This could/should check a separate bitmap of trigger-
1466          * enabled queues, but for now we only implement uAPSD w/o
1467          * TSPEC changes to the ACs, so they're always the same.
1468          */
1469         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1470             tid != IEEE80211_NUM_TIDS)
1471                 return;
1472 
1473         /* if we are in a service period, do nothing */
1474         if (test_sta_flag(sta, WLAN_STA_SP))
1475                 return;
1476 
1477         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1478                 ieee80211_sta_ps_deliver_uapsd(sta);
1479         else
1480                 set_sta_flag(sta, WLAN_STA_UAPSD);
1481 }
1482 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1483 
1484 static ieee80211_rx_result debug_noinline
1485 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1486 {
1487         struct ieee80211_sub_if_data *sdata = rx->sdata;
1488         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1489         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1490 
1491         if (!rx->sta)
1492                 return RX_CONTINUE;
1493 
1494         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1495             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1496                 return RX_CONTINUE;
1497 
1498         /*
1499          * The device handles station powersave, so don't do anything about
1500          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1501          * it to mac80211 since they're handled.)
1502          */
1503         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1504                 return RX_CONTINUE;
1505 
1506         /*
1507          * Don't do anything if the station isn't already asleep. In
1508          * the uAPSD case, the station will probably be marked asleep,
1509          * in the PS-Poll case the station must be confused ...
1510          */
1511         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1512                 return RX_CONTINUE;
1513 
1514         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1515                 ieee80211_sta_pspoll(&rx->sta->sta);
1516 
1517                 /* Free PS Poll skb here instead of returning RX_DROP that would
1518                  * count as an dropped frame. */
1519                 dev_kfree_skb(rx->skb);
1520 
1521                 return RX_QUEUED;
1522         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1523                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1524                    ieee80211_has_pm(hdr->frame_control) &&
1525                    (ieee80211_is_data_qos(hdr->frame_control) ||
1526                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1527                 u8 tid;
1528 
1529                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1530 
1531                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1532         }
1533 
1534         return RX_CONTINUE;
1535 }
1536 
1537 static ieee80211_rx_result debug_noinline
1538 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1539 {
1540         struct sta_info *sta = rx->sta;
1541         struct sk_buff *skb = rx->skb;
1542         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1543         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1544         int i;
1545 
1546         if (!sta)
1547                 return RX_CONTINUE;
1548 
1549         /*
1550          * Update last_rx only for IBSS packets which are for the current
1551          * BSSID and for station already AUTHORIZED to avoid keeping the
1552          * current IBSS network alive in cases where other STAs start
1553          * using different BSSID. This will also give the station another
1554          * chance to restart the authentication/authorization in case
1555          * something went wrong the first time.
1556          */
1557         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1558                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1559                                                 NL80211_IFTYPE_ADHOC);
1560                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1561                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1562                         sta->rx_stats.last_rx = jiffies;
1563                         if (ieee80211_is_data(hdr->frame_control) &&
1564                             !is_multicast_ether_addr(hdr->addr1))
1565                                 sta->rx_stats.last_rate =
1566                                         sta_stats_encode_rate(status);
1567                 }
1568         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1569                 sta->rx_stats.last_rx = jiffies;
1570         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1571                 /*
1572                  * Mesh beacons will update last_rx when if they are found to
1573                  * match the current local configuration when processed.
1574                  */
1575                 sta->rx_stats.last_rx = jiffies;
1576                 if (ieee80211_is_data(hdr->frame_control))
1577                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1578         }
1579 
1580         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1581                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1582 
1583         sta->rx_stats.fragments++;
1584 
1585         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1586         sta->rx_stats.bytes += rx->skb->len;
1587         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1588 
1589         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1590                 sta->rx_stats.last_signal = status->signal;
1591                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1592         }
1593 
1594         if (status->chains) {
1595                 sta->rx_stats.chains = status->chains;
1596                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1597                         int signal = status->chain_signal[i];
1598 
1599                         if (!(status->chains & BIT(i)))
1600                                 continue;
1601 
1602                         sta->rx_stats.chain_signal_last[i] = signal;
1603                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1604                                         -signal);
1605                 }
1606         }
1607 
1608         /*
1609          * Change STA power saving mode only at the end of a frame
1610          * exchange sequence.
1611          */
1612         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1613             !ieee80211_has_morefrags(hdr->frame_control) &&
1614             !ieee80211_is_back_req(hdr->frame_control) &&
1615             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1616             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1617              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1618             /*
1619              * PM bit is only checked in frames where it isn't reserved,
1620              * in AP mode it's reserved in non-bufferable management frames
1621              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1622              * BAR frames should be ignored as specified in
1623              * IEEE 802.11-2012 10.2.1.2.
1624              */
1625             (!ieee80211_is_mgmt(hdr->frame_control) ||
1626              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1627                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1628                         if (!ieee80211_has_pm(hdr->frame_control))
1629                                 sta_ps_end(sta);
1630                 } else {
1631                         if (ieee80211_has_pm(hdr->frame_control))
1632                                 sta_ps_start(sta);
1633                 }
1634         }
1635 
1636         /* mesh power save support */
1637         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1638                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1639 
1640         /*
1641          * Drop (qos-)data::nullfunc frames silently, since they
1642          * are used only to control station power saving mode.
1643          */
1644         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1645             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1646                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1647 
1648                 /*
1649                  * If we receive a 4-addr nullfunc frame from a STA
1650                  * that was not moved to a 4-addr STA vlan yet send
1651                  * the event to userspace and for older hostapd drop
1652                  * the frame to the monitor interface.
1653                  */
1654                 if (ieee80211_has_a4(hdr->frame_control) &&
1655                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1656                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1657                       !rx->sdata->u.vlan.sta))) {
1658                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1659                                 cfg80211_rx_unexpected_4addr_frame(
1660                                         rx->sdata->dev, sta->sta.addr,
1661                                         GFP_ATOMIC);
1662                         return RX_DROP_MONITOR;
1663                 }
1664                 /*
1665                  * Update counter and free packet here to avoid
1666                  * counting this as a dropped packed.
1667                  */
1668                 sta->rx_stats.packets++;
1669                 dev_kfree_skb(rx->skb);
1670                 return RX_QUEUED;
1671         }
1672 
1673         return RX_CONTINUE;
1674 } /* ieee80211_rx_h_sta_process */
1675 
1676 static ieee80211_rx_result debug_noinline
1677 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1678 {
1679         struct sk_buff *skb = rx->skb;
1680         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1681         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1682         int keyidx;
1683         int hdrlen;
1684         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1685         struct ieee80211_key *sta_ptk = NULL;
1686         int mmie_keyidx = -1;
1687         __le16 fc;
1688         const struct ieee80211_cipher_scheme *cs = NULL;
1689 
1690         /*
1691          * Key selection 101
1692          *
1693          * There are four types of keys:
1694          *  - GTK (group keys)
1695          *  - IGTK (group keys for management frames)
1696          *  - PTK (pairwise keys)
1697          *  - STK (station-to-station pairwise keys)
1698          *
1699          * When selecting a key, we have to distinguish between multicast
1700          * (including broadcast) and unicast frames, the latter can only
1701          * use PTKs and STKs while the former always use GTKs and IGTKs.
1702          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1703          * unicast frames can also use key indices like GTKs. Hence, if we
1704          * don't have a PTK/STK we check the key index for a WEP key.
1705          *
1706          * Note that in a regular BSS, multicast frames are sent by the
1707          * AP only, associated stations unicast the frame to the AP first
1708          * which then multicasts it on their behalf.
1709          *
1710          * There is also a slight problem in IBSS mode: GTKs are negotiated
1711          * with each station, that is something we don't currently handle.
1712          * The spec seems to expect that one negotiates the same key with
1713          * every station but there's no such requirement; VLANs could be
1714          * possible.
1715          */
1716 
1717         /* start without a key */
1718         rx->key = NULL;
1719         fc = hdr->frame_control;
1720 
1721         if (rx->sta) {
1722                 int keyid = rx->sta->ptk_idx;
1723 
1724                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1725                         cs = rx->sta->cipher_scheme;
1726                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1727                         if (unlikely(keyid < 0))
1728                                 return RX_DROP_UNUSABLE;
1729                 }
1730                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1731         }
1732 
1733         if (!ieee80211_has_protected(fc))
1734                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1735 
1736         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1737                 rx->key = sta_ptk;
1738                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1739                     (status->flag & RX_FLAG_IV_STRIPPED))
1740                         return RX_CONTINUE;
1741                 /* Skip decryption if the frame is not protected. */
1742                 if (!ieee80211_has_protected(fc))
1743                         return RX_CONTINUE;
1744         } else if (mmie_keyidx >= 0) {
1745                 /* Broadcast/multicast robust management frame / BIP */
1746                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1747                     (status->flag & RX_FLAG_IV_STRIPPED))
1748                         return RX_CONTINUE;
1749 
1750                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1751                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1752                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1753                 if (rx->sta) {
1754                         if (ieee80211_is_group_privacy_action(skb) &&
1755                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1756                                 return RX_DROP_MONITOR;
1757 
1758                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1759                 }
1760                 if (!rx->key)
1761                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1762         } else if (!ieee80211_has_protected(fc)) {
1763                 /*
1764                  * The frame was not protected, so skip decryption. However, we
1765                  * need to set rx->key if there is a key that could have been
1766                  * used so that the frame may be dropped if encryption would
1767                  * have been expected.
1768                  */
1769                 struct ieee80211_key *key = NULL;
1770                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1771                 int i;
1772 
1773                 if (ieee80211_is_mgmt(fc) &&
1774                     is_multicast_ether_addr(hdr->addr1) &&
1775                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1776                         rx->key = key;
1777                 else {
1778                         if (rx->sta) {
1779                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1780                                         key = rcu_dereference(rx->sta->gtk[i]);
1781                                         if (key)
1782                                                 break;
1783                                 }
1784                         }
1785                         if (!key) {
1786                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1787                                         key = rcu_dereference(sdata->keys[i]);
1788                                         if (key)
1789                                                 break;
1790                                 }
1791                         }
1792                         if (key)
1793                                 rx->key = key;
1794                 }
1795                 return RX_CONTINUE;
1796         } else {
1797                 u8 keyid;
1798 
1799                 /*
1800                  * The device doesn't give us the IV so we won't be
1801                  * able to look up the key. That's ok though, we
1802                  * don't need to decrypt the frame, we just won't
1803                  * be able to keep statistics accurate.
1804                  * Except for key threshold notifications, should
1805                  * we somehow allow the driver to tell us which key
1806                  * the hardware used if this flag is set?
1807                  */
1808                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1809                     (status->flag & RX_FLAG_IV_STRIPPED))
1810                         return RX_CONTINUE;
1811 
1812                 hdrlen = ieee80211_hdrlen(fc);
1813 
1814                 if (cs) {
1815                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1816 
1817                         if (unlikely(keyidx < 0))
1818                                 return RX_DROP_UNUSABLE;
1819                 } else {
1820                         if (rx->skb->len < 8 + hdrlen)
1821                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1822                         /*
1823                          * no need to call ieee80211_wep_get_keyidx,
1824                          * it verifies a bunch of things we've done already
1825                          */
1826                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1827                         keyidx = keyid >> 6;
1828                 }
1829 
1830                 /* check per-station GTK first, if multicast packet */
1831                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1832                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1833 
1834                 /* if not found, try default key */
1835                 if (!rx->key) {
1836                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1837 
1838                         /*
1839                          * RSNA-protected unicast frames should always be
1840                          * sent with pairwise or station-to-station keys,
1841                          * but for WEP we allow using a key index as well.
1842                          */
1843                         if (rx->key &&
1844                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1845                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1846                             !is_multicast_ether_addr(hdr->addr1))
1847                                 rx->key = NULL;
1848                 }
1849         }
1850 
1851         if (rx->key) {
1852                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1853                         return RX_DROP_MONITOR;
1854 
1855                 /* TODO: add threshold stuff again */
1856         } else {
1857                 return RX_DROP_MONITOR;
1858         }
1859 
1860         switch (rx->key->conf.cipher) {
1861         case WLAN_CIPHER_SUITE_WEP40:
1862         case WLAN_CIPHER_SUITE_WEP104:
1863                 result = ieee80211_crypto_wep_decrypt(rx);
1864                 break;
1865         case WLAN_CIPHER_SUITE_TKIP:
1866                 result = ieee80211_crypto_tkip_decrypt(rx);
1867                 break;
1868         case WLAN_CIPHER_SUITE_CCMP:
1869                 result = ieee80211_crypto_ccmp_decrypt(
1870                         rx, IEEE80211_CCMP_MIC_LEN);
1871                 break;
1872         case WLAN_CIPHER_SUITE_CCMP_256:
1873                 result = ieee80211_crypto_ccmp_decrypt(
1874                         rx, IEEE80211_CCMP_256_MIC_LEN);
1875                 break;
1876         case WLAN_CIPHER_SUITE_AES_CMAC:
1877                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1878                 break;
1879         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1880                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1881                 break;
1882         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1883         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1884                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1885                 break;
1886         case WLAN_CIPHER_SUITE_GCMP:
1887         case WLAN_CIPHER_SUITE_GCMP_256:
1888                 result = ieee80211_crypto_gcmp_decrypt(rx);
1889                 break;
1890         default:
1891                 result = ieee80211_crypto_hw_decrypt(rx);
1892         }
1893 
1894         /* the hdr variable is invalid after the decrypt handlers */
1895 
1896         /* either the frame has been decrypted or will be dropped */
1897         status->flag |= RX_FLAG_DECRYPTED;
1898 
1899         return result;
1900 }
1901 
1902 static inline struct ieee80211_fragment_entry *
1903 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1904                          unsigned int frag, unsigned int seq, int rx_queue,
1905                          struct sk_buff **skb)
1906 {
1907         struct ieee80211_fragment_entry *entry;
1908 
1909         entry = &sdata->fragments[sdata->fragment_next++];
1910         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1911                 sdata->fragment_next = 0;
1912 
1913         if (!skb_queue_empty(&entry->skb_list))
1914                 __skb_queue_purge(&entry->skb_list);
1915 
1916         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1917         *skb = NULL;
1918         entry->first_frag_time = jiffies;
1919         entry->seq = seq;
1920         entry->rx_queue = rx_queue;
1921         entry->last_frag = frag;
1922         entry->check_sequential_pn = false;
1923         entry->extra_len = 0;
1924 
1925         return entry;
1926 }
1927 
1928 static inline struct ieee80211_fragment_entry *
1929 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1930                           unsigned int frag, unsigned int seq,
1931                           int rx_queue, struct ieee80211_hdr *hdr)
1932 {
1933         struct ieee80211_fragment_entry *entry;
1934         int i, idx;
1935 
1936         idx = sdata->fragment_next;
1937         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1938                 struct ieee80211_hdr *f_hdr;
1939 
1940                 idx--;
1941                 if (idx < 0)
1942                         idx = IEEE80211_FRAGMENT_MAX - 1;
1943 
1944                 entry = &sdata->fragments[idx];
1945                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1946                     entry->rx_queue != rx_queue ||
1947                     entry->last_frag + 1 != frag)
1948                         continue;
1949 
1950                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1951 
1952                 /*
1953                  * Check ftype and addresses are equal, else check next fragment
1954                  */
1955                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1956                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1957                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1958                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1959                         continue;
1960 
1961                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1962                         __skb_queue_purge(&entry->skb_list);
1963                         continue;
1964                 }
1965                 return entry;
1966         }
1967 
1968         return NULL;
1969 }
1970 
1971 static ieee80211_rx_result debug_noinline
1972 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1973 {
1974         struct ieee80211_hdr *hdr;
1975         u16 sc;
1976         __le16 fc;
1977         unsigned int frag, seq;
1978         struct ieee80211_fragment_entry *entry;
1979         struct sk_buff *skb;
1980 
1981         hdr = (struct ieee80211_hdr *)rx->skb->data;
1982         fc = hdr->frame_control;
1983 
1984         if (ieee80211_is_ctl(fc))
1985                 return RX_CONTINUE;
1986 
1987         sc = le16_to_cpu(hdr->seq_ctrl);
1988         frag = sc & IEEE80211_SCTL_FRAG;
1989 
1990         if (is_multicast_ether_addr(hdr->addr1)) {
1991                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1992                 goto out_no_led;
1993         }
1994 
1995         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1996                 goto out;
1997 
1998         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1999 
2000         if (skb_linearize(rx->skb))
2001                 return RX_DROP_UNUSABLE;
2002 
2003         /*
2004          *  skb_linearize() might change the skb->data and
2005          *  previously cached variables (in this case, hdr) need to
2006          *  be refreshed with the new data.
2007          */
2008         hdr = (struct ieee80211_hdr *)rx->skb->data;
2009         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2010 
2011         if (frag == 0) {
2012                 /* This is the first fragment of a new frame. */
2013                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2014                                                  rx->seqno_idx, &(rx->skb));
2015                 if (rx->key &&
2016                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2017                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2018                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2019                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2020                     ieee80211_has_protected(fc)) {
2021                         int queue = rx->security_idx;
2022 
2023                         /* Store CCMP/GCMP PN so that we can verify that the
2024                          * next fragment has a sequential PN value.
2025                          */
2026                         entry->check_sequential_pn = true;
2027                         memcpy(entry->last_pn,
2028                                rx->key->u.ccmp.rx_pn[queue],
2029                                IEEE80211_CCMP_PN_LEN);
2030                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2031                                               u.ccmp.rx_pn) !=
2032                                      offsetof(struct ieee80211_key,
2033                                               u.gcmp.rx_pn));
2034                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2035                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2036                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2037                                      IEEE80211_GCMP_PN_LEN);
2038                 }
2039                 return RX_QUEUED;
2040         }
2041 
2042         /* This is a fragment for a frame that should already be pending in
2043          * fragment cache. Add this fragment to the end of the pending entry.
2044          */
2045         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2046                                           rx->seqno_idx, hdr);
2047         if (!entry) {
2048                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2049                 return RX_DROP_MONITOR;
2050         }
2051 
2052         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2053          *  MPDU PN values are not incrementing in steps of 1."
2054          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2055          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2056          */
2057         if (entry->check_sequential_pn) {
2058                 int i;
2059                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2060                 int queue;
2061 
2062                 if (!rx->key ||
2063                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2064                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2065                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2066                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2067                         return RX_DROP_UNUSABLE;
2068                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2069                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2070                         pn[i]++;
2071                         if (pn[i])
2072                                 break;
2073                 }
2074                 queue = rx->security_idx;
2075                 rpn = rx->key->u.ccmp.rx_pn[queue];
2076                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2077                         return RX_DROP_UNUSABLE;
2078                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2079         }
2080 
2081         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2082         __skb_queue_tail(&entry->skb_list, rx->skb);
2083         entry->last_frag = frag;
2084         entry->extra_len += rx->skb->len;
2085         if (ieee80211_has_morefrags(fc)) {
2086                 rx->skb = NULL;
2087                 return RX_QUEUED;
2088         }
2089 
2090         rx->skb = __skb_dequeue(&entry->skb_list);
2091         if (skb_tailroom(rx->skb) < entry->extra_len) {
2092                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2093                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2094                                               GFP_ATOMIC))) {
2095                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2096                         __skb_queue_purge(&entry->skb_list);
2097                         return RX_DROP_UNUSABLE;
2098                 }
2099         }
2100         while ((skb = __skb_dequeue(&entry->skb_list))) {
2101                 skb_put_data(rx->skb, skb->data, skb->len);
2102                 dev_kfree_skb(skb);
2103         }
2104 
2105  out:
2106         ieee80211_led_rx(rx->local);
2107  out_no_led:
2108         if (rx->sta)
2109                 rx->sta->rx_stats.packets++;
2110         return RX_CONTINUE;
2111 }
2112 
2113 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2114 {
2115         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2116                 return -EACCES;
2117 
2118         return 0;
2119 }
2120 
2121 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2122 {
2123         struct sk_buff *skb = rx->skb;
2124         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2125 
2126         /*
2127          * Pass through unencrypted frames if the hardware has
2128          * decrypted them already.
2129          */
2130         if (status->flag & RX_FLAG_DECRYPTED)
2131                 return 0;
2132 
2133         /* Drop unencrypted frames if key is set. */
2134         if (unlikely(!ieee80211_has_protected(fc) &&
2135                      !ieee80211_is_nullfunc(fc) &&
2136                      ieee80211_is_data(fc) && rx->key))
2137                 return -EACCES;
2138 
2139         return 0;
2140 }
2141 
2142 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2143 {
2144         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2145         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2146         __le16 fc = hdr->frame_control;
2147 
2148         /*
2149          * Pass through unencrypted frames if the hardware has
2150          * decrypted them already.
2151          */
2152         if (status->flag & RX_FLAG_DECRYPTED)
2153                 return 0;
2154 
2155         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2156                 if (unlikely(!ieee80211_has_protected(fc) &&
2157                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2158                              rx->key)) {
2159                         if (ieee80211_is_deauth(fc) ||
2160                             ieee80211_is_disassoc(fc))
2161                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2162                                                              rx->skb->data,
2163                                                              rx->skb->len);
2164                         return -EACCES;
2165                 }
2166                 /* BIP does not use Protected field, so need to check MMIE */
2167                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2168                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2169                         if (ieee80211_is_deauth(fc) ||
2170                             ieee80211_is_disassoc(fc))
2171                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2172                                                              rx->skb->data,
2173                                                              rx->skb->len);
2174                         return -EACCES;
2175                 }
2176                 /*
2177                  * When using MFP, Action frames are not allowed prior to
2178                  * having configured keys.
2179                  */
2180                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2181                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2182                         return -EACCES;
2183         }
2184 
2185         return 0;
2186 }
2187 
2188 static int
2189 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2190 {
2191         struct ieee80211_sub_if_data *sdata = rx->sdata;
2192         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2193         bool check_port_control = false;
2194         struct ethhdr *ehdr;
2195         int ret;
2196 
2197         *port_control = false;
2198         if (ieee80211_has_a4(hdr->frame_control) &&
2199             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2200                 return -1;
2201 
2202         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2203             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2204 
2205                 if (!sdata->u.mgd.use_4addr)
2206                         return -1;
2207                 else
2208                         check_port_control = true;
2209         }
2210 
2211         if (is_multicast_ether_addr(hdr->addr1) &&
2212             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2213                 return -1;
2214 
2215         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2216         if (ret < 0)
2217                 return ret;
2218 
2219         ehdr = (struct ethhdr *) rx->skb->data;
2220         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2221                 *port_control = true;
2222         else if (check_port_control)
2223                 return -1;
2224 
2225         return 0;
2226 }
2227 
2228 /*
2229  * requires that rx->skb is a frame with ethernet header
2230  */
2231 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2232 {
2233         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2234                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2235         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2236 
2237         /*
2238          * Allow EAPOL frames to us/the PAE group address regardless
2239          * of whether the frame was encrypted or not.
2240          */
2241         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2242             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2243              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2244                 return true;
2245 
2246         if (ieee80211_802_1x_port_control(rx) ||
2247             ieee80211_drop_unencrypted(rx, fc))
2248                 return false;
2249 
2250         return true;
2251 }
2252 
2253 /*
2254  * requires that rx->skb is a frame with ethernet header
2255  */
2256 static void
2257 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2258 {
2259         struct ieee80211_sub_if_data *sdata = rx->sdata;
2260         struct net_device *dev = sdata->dev;
2261         struct sk_buff *skb, *xmit_skb;
2262         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2263         struct sta_info *dsta;
2264 
2265         skb = rx->skb;
2266         xmit_skb = NULL;
2267 
2268         ieee80211_rx_stats(dev, skb->len);
2269 
2270         if (rx->sta) {
2271                 /* The seqno index has the same property as needed
2272                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2273                  * for non-QoS-data frames. Here we know it's a data
2274                  * frame, so count MSDUs.
2275                  */
2276                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2277                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2278                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2279         }
2280 
2281         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2282              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2283             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2284             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2285                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2286                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2287                         /*
2288                          * send multicast frames both to higher layers in
2289                          * local net stack and back to the wireless medium
2290                          */
2291                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2292                         if (!xmit_skb)
2293                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2294                                                     dev->name);
2295                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2296                         dsta = sta_info_get(sdata, skb->data);
2297                         if (dsta) {
2298                                 /*
2299                                  * The destination station is associated to
2300                                  * this AP (in this VLAN), so send the frame
2301                                  * directly to it and do not pass it to local
2302                                  * net stack.
2303                                  */
2304                                 xmit_skb = skb;
2305                                 skb = NULL;
2306                         }
2307                 }
2308         }
2309 
2310 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2311         if (skb) {
2312                 /* 'align' will only take the values 0 or 2 here since all
2313                  * frames are required to be aligned to 2-byte boundaries
2314                  * when being passed to mac80211; the code here works just
2315                  * as well if that isn't true, but mac80211 assumes it can
2316                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2317                  */
2318                 int align;
2319 
2320                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2321                 if (align) {
2322                         if (WARN_ON(skb_headroom(skb) < 3)) {
2323                                 dev_kfree_skb(skb);
2324                                 skb = NULL;
2325                         } else {
2326                                 u8 *data = skb->data;
2327                                 size_t len = skb_headlen(skb);
2328                                 skb->data -= align;
2329                                 memmove(skb->data, data, len);
2330                                 skb_set_tail_pointer(skb, len);
2331                         }
2332                 }
2333         }
2334 #endif
2335 
2336         if (skb) {
2337                 /* deliver to local stack */
2338                 skb->protocol = eth_type_trans(skb, dev);
2339                 memset(skb->cb, 0, sizeof(skb->cb));
2340                 if (rx->napi)
2341                         napi_gro_receive(rx->napi, skb);
2342                 else
2343                         netif_receive_skb(skb);
2344         }
2345 
2346         if (xmit_skb) {
2347                 /*
2348                  * Send to wireless media and increase priority by 256 to
2349                  * keep the received priority instead of reclassifying
2350                  * the frame (see cfg80211_classify8021d).
2351                  */
2352                 xmit_skb->priority += 256;
2353                 xmit_skb->protocol = htons(ETH_P_802_3);
2354                 skb_reset_network_header(xmit_skb);
2355                 skb_reset_mac_header(xmit_skb);
2356                 dev_queue_xmit(xmit_skb);
2357         }
2358 }
2359 
2360 static ieee80211_rx_result debug_noinline
2361 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2362 {
2363         struct net_device *dev = rx->sdata->dev;
2364         struct sk_buff *skb = rx->skb;
2365         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2366         __le16 fc = hdr->frame_control;
2367         struct sk_buff_head frame_list;
2368         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2369         struct ethhdr ethhdr;
2370         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2371 
2372         if (unlikely(!ieee80211_is_data(fc)))
2373                 return RX_CONTINUE;
2374 
2375         if (unlikely(!ieee80211_is_data_present(fc)))
2376                 return RX_DROP_MONITOR;
2377 
2378         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2379                 return RX_CONTINUE;
2380 
2381         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2382                 switch (rx->sdata->vif.type) {
2383                 case NL80211_IFTYPE_AP_VLAN:
2384                         if (!rx->sdata->u.vlan.sta)
2385                                 return RX_DROP_UNUSABLE;
2386                         break;
2387                 case NL80211_IFTYPE_STATION:
2388                         if (!rx->sdata->u.mgd.use_4addr)
2389                                 return RX_DROP_UNUSABLE;
2390                         break;
2391                 default:
2392                         return RX_DROP_UNUSABLE;
2393                 }
2394                 check_da = NULL;
2395                 check_sa = NULL;
2396         } else switch (rx->sdata->vif.type) {
2397                 case NL80211_IFTYPE_AP:
2398                 case NL80211_IFTYPE_AP_VLAN:
2399                         check_da = NULL;
2400                         break;
2401                 case NL80211_IFTYPE_STATION:
2402                         if (!rx->sta ||
2403                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2404                                 check_sa = NULL;
2405                         break;
2406                 case NL80211_IFTYPE_MESH_POINT:
2407                         check_sa = NULL;
2408                         break;
2409                 default:
2410                         break;
2411         }
2412 
2413         if (is_multicast_ether_addr(hdr->addr1))
2414                 return RX_DROP_UNUSABLE;
2415 
2416         skb->dev = dev;
2417         __skb_queue_head_init(&frame_list);
2418 
2419         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2420                                           rx->sdata->vif.addr,
2421                                           rx->sdata->vif.type))
2422                 return RX_DROP_UNUSABLE;
2423 
2424         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2425                                  rx->sdata->vif.type,
2426                                  rx->local->hw.extra_tx_headroom,
2427                                  check_da, check_sa);
2428 
2429         while (!skb_queue_empty(&frame_list)) {
2430                 rx->skb = __skb_dequeue(&frame_list);
2431 
2432                 if (!ieee80211_frame_allowed(rx, fc)) {
2433                         dev_kfree_skb(rx->skb);
2434                         continue;
2435                 }
2436 
2437                 ieee80211_deliver_skb(rx);
2438         }
2439 
2440         return RX_QUEUED;
2441 }
2442 
2443 #ifdef CONFIG_MAC80211_MESH
2444 static ieee80211_rx_result
2445 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2446 {
2447         struct ieee80211_hdr *fwd_hdr, *hdr;
2448         struct ieee80211_tx_info *info;
2449         struct ieee80211s_hdr *mesh_hdr;
2450         struct sk_buff *skb = rx->skb, *fwd_skb;
2451         struct ieee80211_local *local = rx->local;
2452         struct ieee80211_sub_if_data *sdata = rx->sdata;
2453         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2454         u16 ac, q, hdrlen;
2455 
2456         hdr = (struct ieee80211_hdr *) skb->data;
2457         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2458 
2459         /* make sure fixed part of mesh header is there, also checks skb len */
2460         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2461                 return RX_DROP_MONITOR;
2462 
2463         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2464 
2465         /* make sure full mesh header is there, also checks skb len */
2466         if (!pskb_may_pull(rx->skb,
2467                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2468                 return RX_DROP_MONITOR;
2469 
2470         /* reload pointers */
2471         hdr = (struct ieee80211_hdr *) skb->data;
2472         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2473 
2474         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2475                 return RX_DROP_MONITOR;
2476 
2477         /* frame is in RMC, don't forward */
2478         if (ieee80211_is_data(hdr->frame_control) &&
2479             is_multicast_ether_addr(hdr->addr1) &&
2480             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2481                 return RX_DROP_MONITOR;
2482 
2483         if (!ieee80211_is_data(hdr->frame_control))
2484                 return RX_CONTINUE;
2485 
2486         if (!mesh_hdr->ttl)
2487                 return RX_DROP_MONITOR;
2488 
2489         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2490                 struct mesh_path *mppath;
2491                 char *proxied_addr;
2492                 char *mpp_addr;
2493 
2494                 if (is_multicast_ether_addr(hdr->addr1)) {
2495                         mpp_addr = hdr->addr3;
2496                         proxied_addr = mesh_hdr->eaddr1;
2497                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2498                             MESH_FLAGS_AE_A5_A6) {
2499                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2500                         mpp_addr = hdr->addr4;
2501                         proxied_addr = mesh_hdr->eaddr2;
2502                 } else {
2503                         return RX_DROP_MONITOR;
2504                 }
2505 
2506                 rcu_read_lock();
2507                 mppath = mpp_path_lookup(sdata, proxied_addr);
2508                 if (!mppath) {
2509                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2510                 } else {
2511                         spin_lock_bh(&mppath->state_lock);
2512                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2513                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2514                         mppath->exp_time = jiffies;
2515                         spin_unlock_bh(&mppath->state_lock);
2516                 }
2517                 rcu_read_unlock();
2518         }
2519 
2520         /* Frame has reached destination.  Don't forward */
2521         if (!is_multicast_ether_addr(hdr->addr1) &&
2522             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2523                 return RX_CONTINUE;
2524 
2525         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2526         q = sdata->vif.hw_queue[ac];
2527         if (ieee80211_queue_stopped(&local->hw, q)) {
2528                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2529                 return RX_DROP_MONITOR;
2530         }
2531         skb_set_queue_mapping(skb, q);
2532 
2533         if (!--mesh_hdr->ttl) {
2534                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2535                 goto out;
2536         }
2537 
2538         if (!ifmsh->mshcfg.dot11MeshForwarding)
2539                 goto out;
2540 
2541         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2542                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2543         if (!fwd_skb) {
2544                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2545                                     sdata->name);
2546                 goto out;
2547         }
2548 
2549         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2550         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2551         info = IEEE80211_SKB_CB(fwd_skb);
2552         memset(info, 0, sizeof(*info));
2553         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2554         info->control.vif = &rx->sdata->vif;
2555         info->control.jiffies = jiffies;
2556         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2557                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2558                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2559                 /* update power mode indication when forwarding */
2560                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2561         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2562                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2563                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2564         } else {
2565                 /* unable to resolve next hop */
2566                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2567                                    fwd_hdr->addr3, 0,
2568                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2569                                    fwd_hdr->addr2);
2570                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2571                 kfree_skb(fwd_skb);
2572                 return RX_DROP_MONITOR;
2573         }
2574 
2575         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2576         ieee80211_add_pending_skb(local, fwd_skb);
2577  out:
2578         if (is_multicast_ether_addr(hdr->addr1))
2579                 return RX_CONTINUE;
2580         return RX_DROP_MONITOR;
2581 }
2582 #endif
2583 
2584 static ieee80211_rx_result debug_noinline
2585 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2586 {
2587         struct ieee80211_sub_if_data *sdata = rx->sdata;
2588         struct ieee80211_local *local = rx->local;
2589         struct net_device *dev = sdata->dev;
2590         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2591         __le16 fc = hdr->frame_control;
2592         bool port_control;
2593         int err;
2594 
2595         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2596                 return RX_CONTINUE;
2597 
2598         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2599                 return RX_DROP_MONITOR;
2600 
2601         /*
2602          * Send unexpected-4addr-frame event to hostapd. For older versions,
2603          * also drop the frame to cooked monitor interfaces.
2604          */
2605         if (ieee80211_has_a4(hdr->frame_control) &&
2606             sdata->vif.type == NL80211_IFTYPE_AP) {
2607                 if (rx->sta &&
2608                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2609                         cfg80211_rx_unexpected_4addr_frame(
2610                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2611                 return RX_DROP_MONITOR;
2612         }
2613 
2614         err = __ieee80211_data_to_8023(rx, &port_control);
2615         if (unlikely(err))
2616                 return RX_DROP_UNUSABLE;
2617 
2618         if (!ieee80211_frame_allowed(rx, fc))
2619                 return RX_DROP_MONITOR;
2620 
2621         /* directly handle TDLS channel switch requests/responses */
2622         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2623                                                 cpu_to_be16(ETH_P_TDLS))) {
2624                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2625 
2626                 if (pskb_may_pull(rx->skb,
2627                                   offsetof(struct ieee80211_tdls_data, u)) &&
2628                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2629                     tf->category == WLAN_CATEGORY_TDLS &&
2630                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2631                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2632                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2633                         schedule_work(&local->tdls_chsw_work);
2634                         if (rx->sta)
2635                                 rx->sta->rx_stats.packets++;
2636 
2637                         return RX_QUEUED;
2638                 }
2639         }
2640 
2641         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2642             unlikely(port_control) && sdata->bss) {
2643                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2644                                      u.ap);
2645                 dev = sdata->dev;
2646                 rx->sdata = sdata;
2647         }
2648 
2649         rx->skb->dev = dev;
2650 
2651         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2652             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2653             !is_multicast_ether_addr(
2654                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2655             (!local->scanning &&
2656              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2657                 mod_timer(&local->dynamic_ps_timer, jiffies +
2658                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2659 
2660         ieee80211_deliver_skb(rx);
2661 
2662         return RX_QUEUED;
2663 }
2664 
2665 static ieee80211_rx_result debug_noinline
2666 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2667 {
2668         struct sk_buff *skb = rx->skb;
2669         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2670         struct tid_ampdu_rx *tid_agg_rx;
2671         u16 start_seq_num;
2672         u16 tid;
2673 
2674         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2675                 return RX_CONTINUE;
2676 
2677         if (ieee80211_is_back_req(bar->frame_control)) {
2678                 struct {
2679                         __le16 control, start_seq_num;
2680                 } __packed bar_data;
2681                 struct ieee80211_event event = {
2682                         .type = BAR_RX_EVENT,
2683                 };
2684 
2685                 if (!rx->sta)
2686                         return RX_DROP_MONITOR;
2687 
2688                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2689                                   &bar_data, sizeof(bar_data)))
2690                         return RX_DROP_MONITOR;
2691 
2692                 tid = le16_to_cpu(bar_data.control) >> 12;
2693 
2694                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2695                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2696                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2697                                              WLAN_BACK_RECIPIENT,
2698                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2699 
2700                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2701                 if (!tid_agg_rx)
2702                         return RX_DROP_MONITOR;
2703 
2704                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2705                 event.u.ba.tid = tid;
2706                 event.u.ba.ssn = start_seq_num;
2707                 event.u.ba.sta = &rx->sta->sta;
2708 
2709                 /* reset session timer */
2710                 if (tid_agg_rx->timeout)
2711                         mod_timer(&tid_agg_rx->session_timer,
2712                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2713 
2714                 spin_lock(&tid_agg_rx->reorder_lock);
2715                 /* release stored frames up to start of BAR */
2716                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2717                                                  start_seq_num, frames);
2718                 spin_unlock(&tid_agg_rx->reorder_lock);
2719 
2720                 drv_event_callback(rx->local, rx->sdata, &event);
2721 
2722                 kfree_skb(skb);
2723                 return RX_QUEUED;
2724         }
2725 
2726         /*
2727          * After this point, we only want management frames,
2728          * so we can drop all remaining control frames to
2729          * cooked monitor interfaces.
2730          */
2731         return RX_DROP_MONITOR;
2732 }
2733 
2734 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2735                                            struct ieee80211_mgmt *mgmt,
2736                                            size_t len)
2737 {
2738         struct ieee80211_local *local = sdata->local;
2739         struct sk_buff *skb;
2740         struct ieee80211_mgmt *resp;
2741 
2742         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2743                 /* Not to own unicast address */
2744                 return;
2745         }
2746 
2747         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2748             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2749                 /* Not from the current AP or not associated yet. */
2750                 return;
2751         }
2752 
2753         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2754                 /* Too short SA Query request frame */
2755                 return;
2756         }
2757 
2758         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2759         if (skb == NULL)
2760                 return;
2761 
2762         skb_reserve(skb, local->hw.extra_tx_headroom);
2763         resp = skb_put_zero(skb, 24);
2764         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2765         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2766         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2767         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2768                                           IEEE80211_STYPE_ACTION);
2769         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2770         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2771         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2772         memcpy(resp->u.action.u.sa_query.trans_id,
2773                mgmt->u.action.u.sa_query.trans_id,
2774                WLAN_SA_QUERY_TR_ID_LEN);
2775 
2776         ieee80211_tx_skb(sdata, skb);
2777 }
2778 
2779 static ieee80211_rx_result debug_noinline
2780 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2781 {
2782         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2783         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2784 
2785         /*
2786          * From here on, look only at management frames.
2787          * Data and control frames are already handled,
2788          * and unknown (reserved) frames are useless.
2789          */
2790         if (rx->skb->len < 24)
2791                 return RX_DROP_MONITOR;
2792 
2793         if (!ieee80211_is_mgmt(mgmt->frame_control))
2794                 return RX_DROP_MONITOR;
2795 
2796         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2797             ieee80211_is_beacon(mgmt->frame_control) &&
2798             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2799                 int sig = 0;
2800 
2801                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2802                         sig = status->signal;
2803 
2804                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2805                                             rx->skb->data, rx->skb->len,
2806                                             status->freq, sig);
2807                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2808         }
2809 
2810         if (ieee80211_drop_unencrypted_mgmt(rx))
2811                 return RX_DROP_UNUSABLE;
2812 
2813         return RX_CONTINUE;
2814 }
2815 
2816 static ieee80211_rx_result debug_noinline
2817 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2818 {
2819         struct ieee80211_local *local = rx->local;
2820         struct ieee80211_sub_if_data *sdata = rx->sdata;
2821         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2822         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2823         int len = rx->skb->len;
2824 
2825         if (!ieee80211_is_action(mgmt->frame_control))
2826                 return RX_CONTINUE;
2827 
2828         /* drop too small frames */
2829         if (len < IEEE80211_MIN_ACTION_SIZE)
2830                 return RX_DROP_UNUSABLE;
2831 
2832         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2833             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2834             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2835                 return RX_DROP_UNUSABLE;
2836 
2837         switch (mgmt->u.action.category) {
2838         case WLAN_CATEGORY_HT:
2839                 /* reject HT action frames from stations not supporting HT */
2840                 if (!rx->sta->sta.ht_cap.ht_supported)
2841                         goto invalid;
2842 
2843                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2844                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2845                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2846                     sdata->vif.type != NL80211_IFTYPE_AP &&
2847                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2848                         break;
2849 
2850                 /* verify action & smps_control/chanwidth are present */
2851                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2852                         goto invalid;
2853 
2854                 switch (mgmt->u.action.u.ht_smps.action) {
2855                 case WLAN_HT_ACTION_SMPS: {
2856                         struct ieee80211_supported_band *sband;
2857                         enum ieee80211_smps_mode smps_mode;
2858 
2859                         /* convert to HT capability */
2860                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2861                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2862                                 smps_mode = IEEE80211_SMPS_OFF;
2863                                 break;
2864                         case WLAN_HT_SMPS_CONTROL_STATIC:
2865                                 smps_mode = IEEE80211_SMPS_STATIC;
2866                                 break;
2867                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2868                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2869                                 break;
2870                         default:
2871                                 goto invalid;
2872                         }
2873 
2874                         /* if no change do nothing */
2875                         if (rx->sta->sta.smps_mode == smps_mode)
2876                                 goto handled;
2877                         rx->sta->sta.smps_mode = smps_mode;
2878 
2879                         sband = rx->local->hw.wiphy->bands[status->band];
2880 
2881                         rate_control_rate_update(local, sband, rx->sta,
2882                                                  IEEE80211_RC_SMPS_CHANGED);
2883                         goto handled;
2884                 }
2885                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2886                         struct ieee80211_supported_band *sband;
2887                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2888                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2889 
2890                         /* If it doesn't support 40 MHz it can't change ... */
2891                         if (!(rx->sta->sta.ht_cap.cap &
2892                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2893                                 goto handled;
2894 
2895                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2896                                 max_bw = IEEE80211_STA_RX_BW_20;
2897                         else
2898                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2899 
2900                         /* set cur_max_bandwidth and recalc sta bw */
2901                         rx->sta->cur_max_bandwidth = max_bw;
2902                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2903 
2904                         if (rx->sta->sta.bandwidth == new_bw)
2905                                 goto handled;
2906 
2907                         rx->sta->sta.bandwidth = new_bw;
2908                         sband = rx->local->hw.wiphy->bands[status->band];
2909 
2910                         rate_control_rate_update(local, sband, rx->sta,
2911                                                  IEEE80211_RC_BW_CHANGED);
2912                         goto handled;
2913                 }
2914                 default:
2915                         goto invalid;
2916                 }
2917 
2918                 break;
2919         case WLAN_CATEGORY_PUBLIC:
2920                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2921                         goto invalid;
2922                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2923                         break;
2924                 if (!rx->sta)
2925                         break;
2926                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2927                         break;
2928                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2929                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2930                         break;
2931                 if (len < offsetof(struct ieee80211_mgmt,
2932                                    u.action.u.ext_chan_switch.variable))
2933                         goto invalid;
2934                 goto queue;
2935         case WLAN_CATEGORY_VHT:
2936                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2937                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2938                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2939                     sdata->vif.type != NL80211_IFTYPE_AP &&
2940                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2941                         break;
2942 
2943                 /* verify action code is present */
2944                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2945                         goto invalid;
2946 
2947                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2948                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2949                         /* verify opmode is present */
2950                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2951                                 goto invalid;
2952                         goto queue;
2953                 }
2954                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2955                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2956                                 goto invalid;
2957                         goto queue;
2958                 }
2959                 default:
2960                         break;
2961                 }
2962                 break;
2963         case WLAN_CATEGORY_BACK:
2964                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2965                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2966                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2967                     sdata->vif.type != NL80211_IFTYPE_AP &&
2968                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2969                         break;
2970 
2971                 /* verify action_code is present */
2972                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2973                         break;
2974 
2975                 switch (mgmt->u.action.u.addba_req.action_code) {
2976                 case WLAN_ACTION_ADDBA_REQ:
2977                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2978                                    sizeof(mgmt->u.action.u.addba_req)))
2979                                 goto invalid;
2980                         break;
2981                 case WLAN_ACTION_ADDBA_RESP:
2982                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2983                                    sizeof(mgmt->u.action.u.addba_resp)))
2984                                 goto invalid;
2985                         break;
2986                 case WLAN_ACTION_DELBA:
2987                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2988                                    sizeof(mgmt->u.action.u.delba)))
2989                                 goto invalid;
2990                         break;
2991                 default:
2992                         goto invalid;
2993                 }
2994 
2995                 goto queue;
2996         case WLAN_CATEGORY_SPECTRUM_MGMT:
2997                 /* verify action_code is present */
2998                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2999                         break;
3000 
3001                 switch (mgmt->u.action.u.measurement.action_code) {
3002                 case WLAN_ACTION_SPCT_MSR_REQ:
3003                         if (status->band != NL80211_BAND_5GHZ)
3004                                 break;
3005 
3006                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3007                                    sizeof(mgmt->u.action.u.measurement)))
3008                                 break;
3009 
3010                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3011                                 break;
3012 
3013                         ieee80211_process_measurement_req(sdata, mgmt, len);
3014                         goto handled;
3015                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3016                         u8 *bssid;
3017                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3018                                    sizeof(mgmt->u.action.u.chan_switch)))
3019                                 break;
3020 
3021                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3022                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3023                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3024                                 break;
3025 
3026                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3027                                 bssid = sdata->u.mgd.bssid;
3028                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3029                                 bssid = sdata->u.ibss.bssid;
3030                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3031                                 bssid = mgmt->sa;
3032                         else
3033                                 break;
3034 
3035                         if (!ether_addr_equal(mgmt->bssid, bssid))
3036                                 break;
3037 
3038                         goto queue;
3039                         }
3040                 }
3041                 break;
3042         case WLAN_CATEGORY_SA_QUERY:
3043                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3044                            sizeof(mgmt->u.action.u.sa_query)))
3045                         break;
3046 
3047                 switch (mgmt->u.action.u.sa_query.action) {
3048                 case WLAN_ACTION_SA_QUERY_REQUEST:
3049                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3050                                 break;
3051                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3052                         goto handled;
3053                 }
3054                 break;
3055         case WLAN_CATEGORY_SELF_PROTECTED:
3056                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3057                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3058                         break;
3059 
3060                 switch (mgmt->u.action.u.self_prot.action_code) {
3061                 case WLAN_SP_MESH_PEERING_OPEN:
3062                 case WLAN_SP_MESH_PEERING_CLOSE:
3063                 case WLAN_SP_MESH_PEERING_CONFIRM:
3064                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3065                                 goto invalid;
3066                         if (sdata->u.mesh.user_mpm)
3067                                 /* userspace handles this frame */
3068                                 break;
3069                         goto queue;
3070                 case WLAN_SP_MGK_INFORM:
3071                 case WLAN_SP_MGK_ACK:
3072                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3073                                 goto invalid;
3074                         break;
3075                 }
3076                 break;
3077         case WLAN_CATEGORY_MESH_ACTION:
3078                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3079                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3080                         break;
3081 
3082                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3083                         break;
3084                 if (mesh_action_is_path_sel(mgmt) &&
3085                     !mesh_path_sel_is_hwmp(sdata))
3086                         break;
3087                 goto queue;
3088         }
3089 
3090         return RX_CONTINUE;
3091 
3092  invalid:
3093         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3094         /* will return in the next handlers */
3095         return RX_CONTINUE;
3096 
3097  handled:
3098         if (rx->sta)
3099                 rx->sta->rx_stats.packets++;
3100         dev_kfree_skb(rx->skb);
3101         return RX_QUEUED;
3102 
3103  queue:
3104         skb_queue_tail(&sdata->skb_queue, rx->skb);
3105         ieee80211_queue_work(&local->hw, &sdata->work);
3106         if (rx->sta)
3107                 rx->sta->rx_stats.packets++;
3108         return RX_QUEUED;
3109 }
3110 
3111 static ieee80211_rx_result debug_noinline
3112 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3113 {
3114         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3115         int sig = 0;
3116 
3117         /* skip known-bad action frames and return them in the next handler */
3118         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3119                 return RX_CONTINUE;
3120 
3121         /*
3122          * Getting here means the kernel doesn't know how to handle
3123          * it, but maybe userspace does ... include returned frames
3124          * so userspace can register for those to know whether ones
3125          * it transmitted were processed or returned.
3126          */
3127 
3128         if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3129                 sig = status->signal;
3130 
3131         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3132                              rx->skb->data, rx->skb->len, 0)) {
3133                 if (rx->sta)
3134                         rx->sta->rx_stats.packets++;
3135                 dev_kfree_skb(rx->skb);
3136                 return RX_QUEUED;
3137         }
3138 
3139         return RX_CONTINUE;
3140 }
3141 
3142 static ieee80211_rx_result debug_noinline
3143 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3144 {
3145         struct ieee80211_local *local = rx->local;
3146         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3147         struct sk_buff *nskb;
3148         struct ieee80211_sub_if_data *sdata = rx->sdata;
3149         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3150 
3151         if (!ieee80211_is_action(mgmt->frame_control))
3152                 return RX_CONTINUE;
3153 
3154         /*
3155          * For AP mode, hostapd is responsible for handling any action
3156          * frames that we didn't handle, including returning unknown
3157          * ones. For all other modes we will return them to the sender,
3158          * setting the 0x80 bit in the action category, as required by
3159          * 802.11-2012 9.24.4.
3160          * Newer versions of hostapd shall also use the management frame
3161          * registration mechanisms, but older ones still use cooked
3162          * monitor interfaces so push all frames there.
3163          */
3164         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3165             (sdata->vif.type == NL80211_IFTYPE_AP ||
3166              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3167                 return RX_DROP_MONITOR;
3168 
3169         if (is_multicast_ether_addr(mgmt->da))
3170                 return RX_DROP_MONITOR;
3171 
3172         /* do not return rejected action frames */
3173         if (mgmt->u.action.category & 0x80)
3174                 return RX_DROP_UNUSABLE;
3175 
3176         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3177                                GFP_ATOMIC);
3178         if (nskb) {
3179                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3180 
3181                 nmgmt->u.action.category |= 0x80;
3182                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3183                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3184 
3185                 memset(nskb->cb, 0, sizeof(nskb->cb));
3186 
3187                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3188                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3189 
3190                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3191                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3192                                       IEEE80211_TX_CTL_NO_CCK_RATE;
3193                         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3194                                 info->hw_queue =
3195                                         local->hw.offchannel_tx_hw_queue;
3196                 }
3197 
3198                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3199                                             status->band);
3200         }
3201         dev_kfree_skb(rx->skb);
3202         return RX_QUEUED;
3203 }
3204 
3205 static ieee80211_rx_result debug_noinline
3206 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3207 {
3208         struct ieee80211_sub_if_data *sdata = rx->sdata;
3209         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3210         __le16 stype;
3211 
3212         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3213 
3214         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3215             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3216             sdata->vif.type != NL80211_IFTYPE_OCB &&
3217             sdata->vif.type != NL80211_IFTYPE_STATION)
3218                 return RX_DROP_MONITOR;
3219 
3220         switch (stype) {
3221         case cpu_to_le16(IEEE80211_STYPE_AUTH):
3222         case cpu_to_le16(IEEE80211_STYPE_BEACON):
3223         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3224                 /* process for all: mesh, mlme, ibss */
3225                 break;
3226         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3227         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3228         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3229         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3230                 if (is_multicast_ether_addr(mgmt->da) &&
3231                     !is_broadcast_ether_addr(mgmt->da))
3232                         return RX_DROP_MONITOR;
3233 
3234                 /* process only for station */
3235                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3236                         return RX_DROP_MONITOR;
3237                 break;
3238         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3239                 /* process only for ibss and mesh */
3240                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3241                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3242                         return RX_DROP_MONITOR;
3243                 break;
3244         default:
3245                 return RX_DROP_MONITOR;
3246         }
3247 
3248         /* queue up frame and kick off work to process it */
3249         skb_queue_tail(&sdata->skb_queue, rx->skb);
3250         ieee80211_queue_work(&rx->local->hw, &sdata->work);
3251         if (rx->sta)
3252                 rx->sta->rx_stats.packets++;
3253 
3254         return RX_QUEUED;
3255 }
3256 
3257 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3258                                         struct ieee80211_rate *rate)
3259 {
3260         struct ieee80211_sub_if_data *sdata;
3261         struct ieee80211_local *local = rx->local;
3262         struct sk_buff *skb = rx->skb, *skb2;
3263         struct net_device *prev_dev = NULL;
3264         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3265         int needed_headroom;
3266 
3267         /*
3268          * If cooked monitor has been processed already, then
3269          * don't do it again. If not, set the flag.
3270          */
3271         if (rx->flags & IEEE80211_RX_CMNTR)
3272                 goto out_free_skb;
3273         rx->flags |= IEEE80211_RX_CMNTR;
3274 
3275         /* If there are no cooked monitor interfaces, just free the SKB */
3276         if (!local->cooked_mntrs)
3277                 goto out_free_skb;
3278 
3279         /* vendor data is long removed here */
3280         status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3281         /* room for the radiotap header based on driver features */
3282         needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3283 
3284         if (skb_headroom(skb) < needed_headroom &&
3285             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3286                 goto out_free_skb;
3287 
3288         /* prepend radiotap information */
3289         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3290                                          false);
3291 
3292         skb_reset_mac_header(skb);
3293         skb->ip_summed = CHECKSUM_UNNECESSARY;
3294         skb->pkt_type = PACKET_OTHERHOST;
3295         skb->protocol = htons(ETH_P_802_2);
3296 
3297         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3298                 if (!ieee80211_sdata_running(sdata))
3299                         continue;
3300 
3301                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3302                     !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3303                         continue;
3304 
3305                 if (prev_dev) {
3306                         skb2 = skb_clone(skb, GFP_ATOMIC);
3307                         if (skb2) {
3308                                 skb2->dev = prev_dev;
3309                                 netif_receive_skb(skb2);
3310                         }
3311                 }
3312 
3313                 prev_dev = sdata->dev;
3314                 ieee80211_rx_stats(sdata->dev, skb->len);
3315         }
3316 
3317         if (prev_dev) {
3318                 skb->dev = prev_dev;
3319                 netif_receive_skb(skb);
3320                 return;
3321         }
3322 
3323  out_free_skb:
3324         dev_kfree_skb(skb);
3325 }
3326 
3327 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3328                                          ieee80211_rx_result res)
3329 {
3330         switch (res) {
3331         case RX_DROP_MONITOR:
3332                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3333                 if (rx->sta)
3334                         rx->sta->rx_stats.dropped++;
3335                 /* fall through */
3336         case RX_CONTINUE: {
3337                 struct ieee80211_rate *rate = NULL;
3338                 struct ieee80211_supported_band *sband;
3339                 struct ieee80211_rx_status *status;
3340 
3341                 status = IEEE80211_SKB_RXCB((rx->skb));
3342 
3343                 sband = rx->local->hw.wiphy->bands[status->band];
3344                 if (!(status->encoding == RX_ENC_HT) &&
3345                     !(status->encoding == RX_ENC_VHT))
3346                         rate = &sband->bitrates[status->rate_idx];
3347 
3348                 ieee80211_rx_cooked_monitor(rx, rate);
3349                 break;
3350                 }
3351         case RX_DROP_UNUSABLE:
3352                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3353                 if (rx->sta)
3354                         rx->sta->rx_stats.dropped++;
3355                 dev_kfree_skb(rx->skb);
3356                 break;
3357         case RX_QUEUED:
3358                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3359                 break;
3360         }
3361 }
3362 
3363 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3364                                   struct sk_buff_head *frames)
3365 {
3366         ieee80211_rx_result res = RX_DROP_MONITOR;
3367         struct sk_buff *skb;
3368 
3369 #define CALL_RXH(rxh)                   \
3370         do {                            \
3371                 res = rxh(rx);          \
3372                 if (res != RX_CONTINUE) \
3373                         goto rxh_next;  \
3374         } while (0)
3375 
3376         /* Lock here to avoid hitting all of the data used in the RX
3377          * path (e.g. key data, station data, ...) concurrently when
3378          * a frame is released from the reorder buffer due to timeout
3379          * from the timer, potentially concurrently with RX from the
3380          * driver.
3381          */
3382         spin_lock_bh(&rx->local->rx_path_lock);
3383 
3384         while ((skb = __skb_dequeue(frames))) {
3385                 /*
3386                  * all the other fields are valid across frames
3387                  * that belong to an aMPDU since they are on the
3388                  * same TID from the same station
3389                  */
3390                 rx->skb = skb;
3391 
3392                 CALL_RXH(ieee80211_rx_h_check_more_data);
3393                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3394                 CALL_RXH(ieee80211_rx_h_sta_process);
3395                 CALL_RXH(ieee80211_rx_h_decrypt);
3396                 CALL_RXH(ieee80211_rx_h_defragment);
3397                 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3398                 /* must be after MMIC verify so header is counted in MPDU mic */
3399 #ifdef CONFIG_MAC80211_MESH
3400                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3401                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
3402 #endif
3403                 CALL_RXH(ieee80211_rx_h_amsdu);
3404                 CALL_RXH(ieee80211_rx_h_data);
3405 
3406                 /* special treatment -- needs the queue */
3407                 res = ieee80211_rx_h_ctrl(rx, frames);
3408                 if (res != RX_CONTINUE)
3409                         goto rxh_next;
3410 
3411                 CALL_RXH(ieee80211_rx_h_mgmt_check);
3412                 CALL_RXH(ieee80211_rx_h_action);
3413                 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3414                 CALL_RXH(ieee80211_rx_h_action_return);
3415                 CALL_RXH(ieee80211_rx_h_mgmt);
3416 
3417  rxh_next:
3418                 ieee80211_rx_handlers_result(rx, res);
3419 
3420 #undef CALL_RXH
3421         }
3422 
3423         spin_unlock_bh(&rx->local->rx_path_lock);
3424 }
3425 
3426 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3427 {
3428         struct sk_buff_head reorder_release;
3429         ieee80211_rx_result res = RX_DROP_MONITOR;
3430 
3431         __skb_queue_head_init(&reorder_release);
3432 
3433 #define CALL_RXH(rxh)                   \
3434         do {                            \
3435                 res = rxh(rx);          \
3436                 if (res != RX_CONTINUE) \
3437                         goto rxh_next;  \
3438         } while (0)
3439 
3440         CALL_RXH(ieee80211_rx_h_check_dup);
3441         CALL_RXH(ieee80211_rx_h_check);
3442 
3443         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3444 
3445         ieee80211_rx_handlers(rx, &reorder_release);
3446         return;
3447 
3448  rxh_next:
3449         ieee80211_rx_handlers_result(rx, res);
3450 
3451 #undef CALL_RXH
3452 }
3453 
3454 /*
3455  * This function makes calls into the RX path, therefore
3456  * it has to be invoked under RCU read lock.
3457  */
3458 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3459 {
3460         struct sk_buff_head frames;
3461         struct ieee80211_rx_data rx = {
3462                 .sta = sta,
3463                 .sdata = sta->sdata,
3464                 .local = sta->local,
3465                 /* This is OK -- must be QoS data frame */
3466                 .security_idx = tid,
3467                 .seqno_idx = tid,
3468                 .napi = NULL, /* must be NULL to not have races */
3469         };
3470         struct tid_ampdu_rx *tid_agg_rx;
3471 
3472         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3473         if (!tid_agg_rx)
3474                 return;
3475 
3476         __skb_queue_head_init(&frames);
3477 
3478         spin_lock(&tid_agg_rx->reorder_lock);
3479         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3480         spin_unlock(&tid_agg_rx->reorder_lock);
3481 
3482         if (!skb_queue_empty(&frames)) {
3483                 struct ieee80211_event event = {
3484                         .type = BA_FRAME_TIMEOUT,
3485                         .u.ba.tid = tid,
3486                         .u.ba.sta = &sta->sta,
3487                 };
3488                 drv_event_callback(rx.local, rx.sdata, &event);
3489         }
3490 
3491         ieee80211_rx_handlers(&rx, &frames);
3492 }
3493 
3494 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3495                                           u16 ssn, u64 filtered,
3496                                           u16 received_mpdus)
3497 {
3498         struct sta_info *sta;
3499         struct tid_ampdu_rx *tid_agg_rx;
3500         struct sk_buff_head frames;
3501         struct ieee80211_rx_data rx = {
3502                 /* This is OK -- must be QoS data frame */
3503                 .security_idx = tid,
3504                 .seqno_idx = tid,
3505         };
3506         int i, diff;
3507 
3508         if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3509                 return;
3510 
3511         __skb_queue_head_init(&frames);
3512 
3513         sta = container_of(pubsta, struct sta_info, sta);
3514 
3515         rx.sta = sta;
3516         rx.sdata = sta->sdata;
3517         rx.local = sta->local;
3518 
3519         rcu_read_lock();
3520         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3521         if (!tid_agg_rx)
3522                 goto out;
3523 
3524         spin_lock_bh(&tid_agg_rx->reorder_lock);
3525 
3526         if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3527                 int release;
3528 
3529                 /* release all frames in the reorder buffer */
3530                 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3531                            IEEE80211_SN_MODULO;
3532                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3533                                                  release, &frames);
3534                 /* update ssn to match received ssn */
3535                 tid_agg_rx->head_seq_num = ssn;
3536         } else {
3537                 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3538                                                  &frames);
3539         }
3540 
3541         /* handle the case that received ssn is behind the mac ssn.
3542          * it can be tid_agg_rx->buf_size behind and still be valid */
3543         diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3544         if (diff >= tid_agg_rx->buf_size) {
3545                 tid_agg_rx->reorder_buf_filtered = 0;
3546                 goto release;
3547         }
3548         filtered = filtered >> diff;
3549         ssn += diff;
3550 
3551         /* update bitmap */
3552         for (i = 0; i < tid_agg_rx->buf_size; i++) {
3553                 int index = (ssn + i) % tid_agg_rx->buf_size;
3554 
3555                 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3556                 if (filtered & BIT_ULL(i))
3557                         tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3558         }
3559 
3560         /* now process also frames that the filter marking released */
3561         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3562 
3563 release:
3564         spin_unlock_bh(&tid_agg_rx->reorder_lock);
3565 
3566         ieee80211_rx_handlers(&rx, &frames);
3567 
3568  out:
3569         rcu_read_unlock();
3570 }
3571 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3572 
3573 /* main receive path */
3574 
3575 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3576 {
3577         struct ieee80211_sub_if_data *sdata = rx->sdata;
3578         struct sk_buff *skb = rx->skb;
3579         struct ieee80211_hdr *hdr = (void *)skb->data;
3580         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3581         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3582         bool multicast = is_multicast_ether_addr(hdr->addr1);
3583 
3584         switch (sdata->vif.type) {
3585         case NL80211_IFTYPE_STATION:
3586                 if (!bssid && !sdata->u.mgd.use_4addr)
3587                         return false;
3588                 if (multicast)
3589                         return true;
3590                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3591         case NL80211_IFTYPE_ADHOC:
3592                 if (!bssid)
3593                         return false;
3594                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3595                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3596                         return false;
3597                 if (ieee80211_is_beacon(hdr->frame_control))
3598                         return true;
3599                 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3600                         return false;
3601                 if (!multicast &&
3602                     !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3603                         return false;
3604                 if (!rx->sta) {
3605                         int rate_idx;
3606                         if (status->encoding != RX_ENC_LEGACY)
3607                                 rate_idx = 0; /* TODO: HT/VHT rates */
3608                         else
3609                                 rate_idx = status->rate_idx;
3610                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3611                                                  BIT(rate_idx));
3612                 }
3613                 return true;
3614         case NL80211_IFTYPE_OCB:
3615                 if (!bssid)
3616                         return false;
3617                 if (!ieee80211_is_data_present(hdr->frame_control))
3618                         return false;
3619                 if (!is_broadcast_ether_addr(bssid))
3620                         return false;
3621                 if (!multicast &&
3622                     !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3623                         return false;
3624                 if (!rx->sta) {
3625                         int rate_idx;
3626                         if (status->encoding != RX_ENC_LEGACY)
3627                                 rate_idx = 0; /* TODO: HT rates */
3628                         else
3629                                 rate_idx = status->rate_idx;
3630                         ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3631                                                 BIT(rate_idx));
3632                 }
3633                 return true;
3634         case NL80211_IFTYPE_MESH_POINT:
3635                 if (multicast)
3636                         return true;
3637                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3638         case NL80211_IFTYPE_AP_VLAN:
3639         case NL80211_IFTYPE_AP:
3640                 if (!bssid)
3641                         return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3642 
3643                 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3644                         /*
3645                          * Accept public action frames even when the
3646                          * BSSID doesn't match, this is used for P2P
3647                          * and location updates. Note that mac80211
3648                          * itself never looks at these frames.
3649                          */
3650                         if (!multicast &&
3651                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3652                                 return false;
3653                         if (ieee80211_is_public_action(hdr, skb->len))
3654                                 return true;
3655                         return ieee80211_is_beacon(hdr->frame_control);
3656                 }
3657 
3658                 if (!ieee80211_has_tods(hdr->frame_control)) {
3659                         /* ignore data frames to TDLS-peers */
3660                         if (ieee80211_is_data(hdr->frame_control))
3661                                 return false;
3662                         /* ignore action frames to TDLS-peers */
3663                         if (ieee80211_is_action(hdr->frame_control) &&
3664                             !is_broadcast_ether_addr(bssid) &&
3665                             !ether_addr_equal(bssid, hdr->addr1))
3666                                 return false;
3667                 }
3668 
3669                 /*
3670                  * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3671                  * the BSSID - we've checked that already but may have accepted
3672                  * the wildcard (ff:ff:ff:ff:ff:ff).
3673                  *
3674                  * It also says:
3675                  *      The BSSID of the Data frame is determined as follows:
3676                  *      a) If the STA is contained within an AP or is associated
3677                  *         with an AP, the BSSID is the address currently in use
3678                  *         by the STA contained in the AP.
3679                  *
3680                  * So we should not accept data frames with an address that's
3681                  * multicast.
3682                  *
3683                  * Accepting it also opens a security problem because stations
3684                  * could encrypt it with the GTK and inject traffic that way.
3685                  */
3686                 if (ieee80211_is_data(hdr->frame_control) && multicast)
3687                         return false;
3688 
3689                 return true;
3690         case NL80211_IFTYPE_WDS:
3691                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3692                         return false;
3693                 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3694         case NL80211_IFTYPE_P2P_DEVICE:
3695                 return ieee80211_is_public_action(hdr, skb->len) ||
3696                        ieee80211_is_probe_req(hdr->frame_control) ||
3697                        ieee80211_is_probe_resp(hdr->frame_control) ||
3698                        ieee80211_is_beacon(hdr->frame_control);
3699         case NL80211_IFTYPE_NAN:
3700                 /* Currently no frames on NAN interface are allowed */
3701                 return false;
3702         default:
3703                 break;
3704         }
3705 
3706         WARN_ON_ONCE(1);
3707         return false;
3708 }
3709 
3710 void ieee80211_check_fast_rx(struct sta_info *sta)
3711 {
3712         struct ieee80211_sub_if_data *sdata = sta->sdata;
3713         struct ieee80211_local *local = sdata->local;
3714         struct ieee80211_key *key;
3715         struct ieee80211_fast_rx fastrx = {
3716                 .dev = sdata->dev,
3717                 .vif_type = sdata->vif.type,
3718                 .control_port_protocol = sdata->control_port_protocol,
3719         }, *old, *new = NULL;
3720         bool assign = false;
3721 
3722         /* use sparse to check that we don't return without updating */
3723         __acquire(check_fast_rx);
3724 
3725         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3726         BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3727         ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3728         ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3729 
3730         fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3731 
3732         /* fast-rx doesn't do reordering */
3733         if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3734             !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3735                 goto clear;
3736 
3737         switch (sdata->vif.type) {
3738         case NL80211_IFTYPE_STATION:
3739                 /* 4-addr is harder to deal with, later maybe */
3740                 if (sdata->u.mgd.use_4addr)
3741                         goto clear;
3742                 /* software powersave is a huge mess, avoid all of it */
3743                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3744                         goto clear;
3745                 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3746                     !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3747                         goto clear;
3748                 if (sta->sta.tdls) {
3749                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3750                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3751                         fastrx.expected_ds_bits = 0;
3752                 } else {
3753                         fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3754                         fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3755                         fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3756                         fastrx.expected_ds_bits =
3757                                 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3758                 }
3759                 break;
3760         case NL80211_IFTYPE_AP_VLAN:
3761         case NL80211_IFTYPE_AP:
3762                 /* parallel-rx requires this, at least with calls to
3763                  * ieee80211_sta_ps_transition()
3764                  */
3765                 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3766                         goto clear;
3767                 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3768                 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3769                 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3770 
3771                 fastrx.internal_forward =
3772                         !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3773                         (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3774                          !sdata->u.vlan.sta);
3775                 break;
3776         default:
3777                 goto clear;
3778         }
3779 
3780         if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3781                 goto clear;
3782 
3783         rcu_read_lock();
3784         key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3785         if (key) {
3786                 switch (key->conf.cipher) {
3787                 case WLAN_CIPHER_SUITE_TKIP:
3788                         /* we don't want to deal with MMIC in fast-rx */
3789                         goto clear_rcu;
3790                 case WLAN_CIPHER_SUITE_CCMP:
3791                 case WLAN_CIPHER_SUITE_CCMP_256:
3792                 case WLAN_CIPHER_SUITE_GCMP:
3793                 case WLAN_CIPHER_SUITE_GCMP_256:
3794                         break;
3795                 default:
3796                         /* we also don't want to deal with WEP or cipher scheme
3797                          * since those require looking up the key idx in the
3798                          * frame, rather than assuming the PTK is used
3799                          * (we need to revisit this once we implement the real
3800                          * PTK index, which is now valid in the spec, but we
3801                          * haven't implemented that part yet)
3802                          */
3803                         goto clear_rcu;
3804                 }
3805 
3806                 fastrx.key = true;
3807                 fastrx.icv_len = key->conf.icv_len;
3808         }
3809 
3810         assign = true;
3811  clear_rcu:
3812         rcu_read_unlock();
3813  clear:
3814         __release(check_fast_rx);
3815 
3816         if (assign)
3817                 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3818 
3819         spin_lock_bh(&sta->lock);
3820         old = rcu_dereference_protected(sta->fast_rx, true);
3821         rcu_assign_pointer(sta->fast_rx, new);
3822         spin_unlock_bh(&sta->lock);
3823 
3824         if (old)
3825                 kfree_rcu(old, rcu_head);
3826 }
3827 
3828 void ieee80211_clear_fast_rx(struct sta_info *sta)
3829 {
3830         struct ieee80211_fast_rx *old;
3831 
3832         spin_lock_bh(&sta->lock);
3833         old = rcu_dereference_protected(sta->fast_rx, true);
3834         RCU_INIT_POINTER(sta->fast_rx, NULL);
3835         spin_unlock_bh(&sta->lock);
3836 
3837         if (old)
3838                 kfree_rcu(old, rcu_head);
3839 }
3840 
3841 void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3842 {
3843         struct ieee80211_local *local = sdata->local;
3844         struct sta_info *sta;
3845 
3846         lockdep_assert_held(&local->sta_mtx);
3847 
3848         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3849                 if (sdata != sta->sdata &&
3850                     (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3851                         continue;
3852                 ieee80211_check_fast_rx(sta);
3853         }
3854 }
3855 
3856 void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3857 {
3858         struct ieee80211_local *local = sdata->local;
3859 
3860         mutex_lock(&local->sta_mtx);
3861         __ieee80211_check_fast_rx_iface(sdata);
3862         mutex_unlock(&local->sta_mtx);
3863 }
3864 
3865 static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3866                                      struct ieee80211_fast_rx *fast_rx)
3867 {
3868         struct sk_buff *skb = rx->skb;
3869         struct ieee80211_hdr *hdr = (void *)skb->data;
3870         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3871         struct sta_info *sta = rx->sta;
3872         int orig_len = skb->len;
3873         int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3874         struct {
3875                 u8 snap[sizeof(rfc1042_header)];
3876                 __be16 proto;
3877         } *payload __aligned(2);
3878         struct {
3879                 u8 da[ETH_ALEN];
3880                 u8 sa[ETH_ALEN];
3881         } addrs __aligned(2);
3882         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3883 
3884         if (fast_rx->uses_rss)
3885                 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3886 
3887         /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3888          * to a common data structure; drivers can implement that per queue
3889          * but we don't have that information in mac80211
3890          */
3891         if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3892                 return false;
3893 
3894 #define FAST_RX_CRYPT_FLAGS     (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3895 
3896         /* If using encryption, we also need to have:
3897          *  - PN_VALIDATED: similar, but the implementation is tricky
3898          *  - DECRYPTED: necessary for PN_VALIDATED
3899          */
3900         if (fast_rx->key &&
3901             (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3902                 return false;
3903 
3904         /* we don't deal with A-MSDU deaggregation here */
3905         if (status->rx_flags & IEEE80211_RX_AMSDU)
3906                 return false;
3907 
3908         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3909                 return false;
3910 
3911         if (unlikely(ieee80211_is_frag(hdr)))
3912                 return false;
3913 
3914         /* Since our interface address cannot be multicast, this
3915          * implicitly also rejects multicast frames without the
3916          * explicit check.
3917          *
3918          * We shouldn't get any *data* frames not addressed to us
3919          * (AP mode will accept multicast *management* frames), but
3920          * punting here will make it go through the full checks in
3921          * ieee80211_accept_frame().
3922          */
3923         if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3924                 return false;
3925 
3926         if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3927                                               IEEE80211_FCTL_TODS)) !=
3928             fast_rx->expected_ds_bits)
3929                 goto drop;
3930 
3931         /* assign the key to drop unencrypted frames (later)
3932          * and strip the IV/MIC if necessary
3933          */
3934         if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3935                 /* GCMP header length is the same */
3936                 snap_offs += IEEE80211_CCMP_HDR_LEN;
3937         }
3938 
3939         if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3940                 goto drop;
3941         payload = (void *)(skb->data + snap_offs);
3942 
3943         if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3944                 return false;
3945 
3946         /* Don't handle these here since they require special code.
3947          * Accept AARP and IPX even though they should come with a
3948          * bridge-tunnel header - but if we get them this way then
3949          * there's little point in discarding them.
3950          */
3951         if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3952                      payload->proto == fast_rx->control_port_protocol))
3953                 return false;
3954 
3955         /* after this point, don't punt to the slowpath! */
3956 
3957         if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3958             pskb_trim(skb, skb->len - fast_rx->icv_len))
3959                 goto drop;
3960 
3961         if (unlikely(fast_rx->sta_notify)) {
3962                 ieee80211_sta_rx_notify(rx->sdata, hdr);
3963                 fast_rx->sta_notify = false;
3964         }
3965 
3966         /* statistics part of ieee80211_rx_h_sta_process() */
3967         stats->last_rx = jiffies;
3968         stats->last_rate = sta_stats_encode_rate(status);
3969 
3970         stats->fragments++;
3971         stats->packets++;
3972 
3973         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3974                 stats->last_signal = status->signal;
3975                 if (!fast_rx->uses_rss)
3976                         ewma_signal_add(&sta->rx_stats_avg.signal,
3977                                         -status->signal);
3978         }
3979 
3980         if (status->chains) {
3981                 int i;
3982 
3983                 stats->chains = status->chains;
3984                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3985                         int signal = status->chain_signal[i];
3986 
3987                         if (!(status->chains & BIT(i)))
3988                                 continue;
3989 
3990                         stats->chain_signal_last[i] = signal;
3991                         if (!fast_rx->uses_rss)
3992                                 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3993                                                 -signal);
3994                 }
3995         }
3996         /* end of statistics */
3997 
3998         if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3999                 goto drop;
4000 
4001         /* do the header conversion - first grab the addresses */
4002         ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4003         ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4004         /* remove the SNAP but leave the ethertype */
4005         skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4006         /* push the addresses in front */
4007         memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4008 
4009         skb->dev = fast_rx->dev;
4010 
4011         ieee80211_rx_stats(fast_rx->dev, skb->len);
4012 
4013         /* The seqno index has the same property as needed
4014          * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4015          * for non-QoS-data frames. Here we know it's a data
4016          * frame, so count MSDUs.
4017          */
4018         u64_stats_update_begin(&stats->syncp);
4019         stats->msdu[rx->seqno_idx]++;
4020         stats->bytes += orig_len;
4021         u64_stats_update_end(&stats->syncp);
4022 
4023         if (fast_rx->internal_forward) {
4024                 struct sk_buff *xmit_skb = NULL;
4025                 bool multicast = is_multicast_ether_addr(skb->data);
4026 
4027                 if (multicast) {
4028                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
4029                 } else if (sta_info_get(rx->sdata, skb->data)) {
4030                         xmit_skb = skb;
4031                         skb = NULL;
4032                 }
4033 
4034                 if (xmit_skb) {
4035                         /*
4036                          * Send to wireless media and increase priority by 256
4037                          * to keep the received priority instead of
4038                          * reclassifying the frame (see cfg80211_classify8021d).
4039                          */
4040                         xmit_skb->priority += 256;
4041                         xmit_skb->protocol = htons(ETH_P_802_3);
4042                         skb_reset_network_header(xmit_skb);
4043                         skb_reset_mac_header(xmit_skb);
4044                         dev_queue_xmit(xmit_skb);
4045                 }
4046 
4047                 if (!skb)
4048                         return true;
4049         }
4050 
4051         /* deliver to local stack */
4052         skb->protocol = eth_type_trans(skb, fast_rx->dev);
4053         memset(skb->cb, 0, sizeof(skb->cb));
4054         if (rx->napi)
4055                 napi_gro_receive(rx->napi, skb);
4056         else
4057                 netif_receive_skb(skb);
4058 
4059         return true;
4060  drop:
4061         dev_kfree_skb(skb);
4062         stats->dropped++;
4063         return true;
4064 }
4065 
4066 /*
4067  * This function returns whether or not the SKB
4068  * was destined for RX processing or not, which,
4069  * if consume is true, is equivalent to whether
4070  * or not the skb was consumed.
4071  */
4072 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4073                                             struct sk_buff *skb, bool consume)
4074 {
4075         struct ieee80211_local *local = rx->local;
4076         struct ieee80211_sub_if_data *sdata = rx->sdata;
4077 
4078         rx->skb = skb;
4079 
4080         /* See if we can do fast-rx; if we have to copy we already lost,
4081          * so punt in that case. We should never have to deliver a data
4082          * frame to multiple interfaces anyway.
4083          *
4084          * We skip the ieee80211_accept_frame() call and do the necessary
4085          * checking inside ieee80211_invoke_fast_rx().
4086          */
4087         if (consume && rx->sta) {
4088                 struct ieee80211_fast_rx *fast_rx;
4089 
4090                 fast_rx = rcu_dereference(rx->sta->fast_rx);
4091                 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4092                         return true;
4093         }
4094 
4095         if (!ieee80211_accept_frame(rx))
4096                 return false;
4097 
4098         if (!consume) {
4099                 skb = skb_copy(skb, GFP_ATOMIC);
4100                 if (!skb) {
4101                         if (net_ratelimit())
4102                                 wiphy_debug(local->hw.wiphy,
4103                                         "failed to copy skb for %s\n",
4104                                         sdata->name);
4105                         return true;
4106                 }
4107 
4108                 rx->skb = skb;
4109         }
4110 
4111         ieee80211_invoke_rx_handlers(rx);
4112         return true;
4113 }
4114 
4115 /*
4116  * This is the actual Rx frames handler. as it belongs to Rx path it must
4117  * be called with rcu_read_lock protection.
4118  */
4119 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4120                                          struct ieee80211_sta *pubsta,
4121                                          struct sk_buff *skb,
4122                                          struct napi_struct *napi)
4123 {
4124         struct ieee80211_local *local = hw_to_local(hw);
4125         struct ieee80211_sub_if_data *sdata;
4126         struct ieee80211_hdr *hdr;
4127         __le16 fc;
4128         struct ieee80211_rx_data rx;
4129         struct ieee80211_sub_if_data *prev;
4130         struct rhlist_head *tmp;
4131         int err = 0;
4132 
4133         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4134         memset(&rx, 0, sizeof(rx));
4135         rx.skb = skb;
4136         rx.local = local;
4137         rx.napi = napi;
4138 
4139         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4140                 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4141 
4142         if (ieee80211_is_mgmt(fc)) {
4143                 /* drop frame if too short for header */
4144                 if (skb->len < ieee80211_hdrlen(fc))
4145                         err = -ENOBUFS;
4146                 else
4147                         err = skb_linearize(skb);
4148         } else {
4149                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4150         }
4151 
4152         if (err) {
4153                 dev_kfree_skb(skb);
4154                 return;
4155         }
4156 
4157         hdr = (struct ieee80211_hdr *)skb->data;
4158         ieee80211_parse_qos(&rx);
4159         ieee80211_verify_alignment(&rx);
4160 
4161         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4162                      ieee80211_is_beacon(hdr->frame_control)))
4163                 ieee80211_scan_rx(local, skb);
4164 
4165         if (ieee80211_is_data(fc)) {
4166                 struct sta_info *sta, *prev_sta;
4167 
4168                 if (pubsta) {
4169                         rx.sta = container_of(pubsta, struct sta_info, sta);
4170                         rx.sdata = rx.sta->sdata;
4171                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4172                                 return;
4173                         goto out;
4174                 }
4175 
4176                 prev_sta = NULL;
4177 
4178                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4179                         if (!prev_sta) {
4180                                 prev_sta = sta;
4181                                 continue;
4182                         }
4183 
4184                         rx.sta = prev_sta;
4185                         rx.sdata = prev_sta->sdata;
4186                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
4187 
4188                         prev_sta = sta;
4189                 }
4190 
4191                 if (prev_sta) {
4192                         rx.sta = prev_sta;
4193                         rx.sdata = prev_sta->sdata;
4194 
4195                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4196                                 return;
4197                         goto out;
4198                 }
4199         }
4200 
4201         prev = NULL;
4202 
4203         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4204                 if (!ieee80211_sdata_running(sdata))
4205                         continue;
4206 
4207                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4208                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4209                         continue;
4210 
4211                 /*
4212                  * frame is destined for this interface, but if it's
4213                  * not also for the previous one we handle that after
4214                  * the loop to avoid copying the SKB once too much
4215                  */
4216 
4217                 if (!prev) {
4218                         prev = sdata;
4219                         continue;
4220                 }
4221 
4222                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4223                 rx.sdata = prev;
4224                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4225 
4226                 prev = sdata;
4227         }
4228 
4229         if (prev) {
4230                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4231                 rx.sdata = prev;
4232 
4233                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4234                         return;
4235         }
4236 
4237  out:
4238         dev_kfree_skb(skb);
4239 }
4240 
4241 /*
4242  * This is the receive path handler. It is called by a low level driver when an
4243  * 802.11 MPDU is received from the hardware.
4244  */
4245 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4246                        struct sk_buff *skb, struct napi_struct *napi)
4247 {
4248         struct ieee80211_local *local = hw_to_local(hw);
4249         struct ieee80211_rate *rate = NULL;
4250         struct ieee80211_supported_band *sband;
4251         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4252 
4253         WARN_ON_ONCE(softirq_count() == 0);
4254 
4255         if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4256                 goto drop;
4257 
4258         sband = local->hw.wiphy->bands[status->band];
4259         if (WARN_ON(!sband))
4260                 goto drop;
4261 
4262         /*
4263          * If we're suspending, it is possible although not too likely
4264          * that we'd be receiving frames after having already partially
4265          * quiesced the stack. We can't process such frames then since
4266          * that might, for example, cause stations to be added or other
4267          * driver callbacks be invoked.
4268          */
4269         if (unlikely(local->quiescing || local->suspended))
4270                 goto drop;
4271 
4272         /* We might be during a HW reconfig, prevent Rx for the same reason */
4273         if (unlikely(local->in_reconfig))
4274                 goto drop;
4275 
4276         /*
4277          * The same happens when we're not even started,
4278          * but that's worth a warning.
4279          */
4280         if (WARN_ON(!local->started))
4281                 goto drop;
4282 
4283         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4284                 /*
4285                  * Validate the rate, unless a PLCP error means that
4286                  * we probably can't have a valid rate here anyway.
4287                  */
4288 
4289                 switch (status->encoding) {
4290                 case RX_ENC_HT:
4291                         /*
4292                          * rate_idx is MCS index, which can be [0-76]
4293                          * as documented on:
4294                          *
4295                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4296                          *
4297                          * Anything else would be some sort of driver or
4298                          * hardware error. The driver should catch hardware
4299                          * errors.
4300                          */
4301                         if (WARN(status->rate_idx > 76,
4302                                  "Rate marked as an HT rate but passed "
4303                                  "status->rate_idx is not "
4304                                  "an MCS index [0-76]: %d (0x%02x)\n",
4305                                  status->rate_idx,
4306                                  status->rate_idx))
4307                                 goto drop;
4308                         break;
4309                 case RX_ENC_VHT:
4310                         if (WARN_ONCE(status->rate_idx > 9 ||
4311                                       !status->nss ||
4312                                       status->nss > 8,
4313                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4314                                       status->rate_idx, status->nss))
4315                                 goto drop;
4316                         break;
4317                 default:
4318                         WARN_ON_ONCE(1);
4319                         /* fall through */
4320                 case RX_ENC_LEGACY:
4321                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4322                                 goto drop;
4323                         rate = &sband->bitrates[status->rate_idx];
4324                 }
4325         }
4326 
4327         status->rx_flags = 0;
4328 
4329         /*
4330          * key references and virtual interfaces are protected using RCU
4331          * and this requires that we are in a read-side RCU section during
4332          * receive processing
4333          */
4334         rcu_read_lock();
4335 
4336         /*
4337          * Frames with failed FCS/PLCP checksum are not returned,
4338          * all other frames are returned without radiotap header
4339          * if it was previously present.
4340          * Also, frames with less than 16 bytes are dropped.
4341          */
4342         skb = ieee80211_rx_monitor(local, skb, rate);
4343         if (!skb) {
4344                 rcu_read_unlock();
4345                 return;
4346         }
4347 
4348         ieee80211_tpt_led_trig_rx(local,
4349                         ((struct ieee80211_hdr *)skb->data)->frame_control,
4350                         skb->len);
4351 
4352         __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4353 
4354         rcu_read_unlock();
4355 
4356         return;
4357  drop:
4358         kfree_skb(skb);
4359 }
4360 EXPORT_SYMBOL(ieee80211_rx_napi);
4361 
4362 /* This is a version of the rx handler that can be called from hard irq
4363  * context. Post the skb on the queue and schedule the tasklet */
4364 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4365 {
4366         struct ieee80211_local *local = hw_to_local(hw);
4367 
4368         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4369 
4370         skb->pkt_type = IEEE80211_RX_MSG;
4371         skb_queue_tail(&local->skb_queue, skb);
4372         tasklet_schedule(&local->tasklet);
4373 }
4374 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4375 

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