Merge tag 'mac80211-for-davem-2018-09-03' of git://git.kernel.org/pub/scm/linux/kerne...
[muen/linux.git] / net / mac80211 / rx.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  * Copyright 2007-2010  Johannes Berg <johannes@sipsolutions.net>
6  * Copyright 2013-2014  Intel Mobile Communications GmbH
7  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
8  * Copyright (C) 2018 Intel Corporation
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  */
14
15 #include <linux/jiffies.h>
16 #include <linux/slab.h>
17 #include <linux/kernel.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <linux/bitops.h>
24 #include <net/mac80211.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <asm/unaligned.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "led.h"
31 #include "mesh.h"
32 #include "wep.h"
33 #include "wpa.h"
34 #include "tkip.h"
35 #include "wme.h"
36 #include "rate.h"
37
38 static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
39 {
40         struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
41
42         u64_stats_update_begin(&tstats->syncp);
43         tstats->rx_packets++;
44         tstats->rx_bytes += len;
45         u64_stats_update_end(&tstats->syncp);
46 }
47
48 static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49                                enum nl80211_iftype type)
50 {
51         __le16 fc = hdr->frame_control;
52
53         if (ieee80211_is_data(fc)) {
54                 if (len < 24) /* drop incorrect hdr len (data) */
55                         return NULL;
56
57                 if (ieee80211_has_a4(fc))
58                         return NULL;
59                 if (ieee80211_has_tods(fc))
60                         return hdr->addr1;
61                 if (ieee80211_has_fromds(fc))
62                         return hdr->addr2;
63
64                 return hdr->addr3;
65         }
66
67         if (ieee80211_is_mgmt(fc)) {
68                 if (len < 24) /* drop incorrect hdr len (mgmt) */
69                         return NULL;
70                 return hdr->addr3;
71         }
72
73         if (ieee80211_is_ctl(fc)) {
74                 if (ieee80211_is_pspoll(fc))
75                         return hdr->addr1;
76
77                 if (ieee80211_is_back_req(fc)) {
78                         switch (type) {
79                         case NL80211_IFTYPE_STATION:
80                                 return hdr->addr2;
81                         case NL80211_IFTYPE_AP:
82                         case NL80211_IFTYPE_AP_VLAN:
83                                 return hdr->addr1;
84                         default:
85                                 break; /* fall through to the return */
86                         }
87                 }
88         }
89
90         return NULL;
91 }
92
93 /*
94  * monitor mode reception
95  *
96  * This function cleans up the SKB, i.e. it removes all the stuff
97  * only useful for monitoring.
98  */
99 static void remove_monitor_info(struct sk_buff *skb,
100                                 unsigned int present_fcs_len,
101                                 unsigned int rtap_space)
102 {
103         if (present_fcs_len)
104                 __pskb_trim(skb, skb->len - present_fcs_len);
105         __pskb_pull(skb, rtap_space);
106 }
107
108 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
109                                      unsigned int rtap_space)
110 {
111         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
112         struct ieee80211_hdr *hdr;
113
114         hdr = (void *)(skb->data + rtap_space);
115
116         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
117                             RX_FLAG_FAILED_PLCP_CRC |
118                             RX_FLAG_ONLY_MONITOR))
119                 return true;
120
121         if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
122                 return true;
123
124         if (ieee80211_is_ctl(hdr->frame_control) &&
125             !ieee80211_is_pspoll(hdr->frame_control) &&
126             !ieee80211_is_back_req(hdr->frame_control))
127                 return true;
128
129         return false;
130 }
131
132 static int
133 ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
134                              struct ieee80211_rx_status *status,
135                              struct sk_buff *skb)
136 {
137         int len;
138
139         /* always present fields */
140         len = sizeof(struct ieee80211_radiotap_header) + 8;
141
142         /* allocate extra bitmaps */
143         if (status->chains)
144                 len += 4 * hweight8(status->chains);
145
146         if (ieee80211_have_rx_timestamp(status)) {
147                 len = ALIGN(len, 8);
148                 len += 8;
149         }
150         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
151                 len += 1;
152
153         /* antenna field, if we don't have per-chain info */
154         if (!status->chains)
155                 len += 1;
156
157         /* padding for RX_FLAGS if necessary */
158         len = ALIGN(len, 2);
159
160         if (status->encoding == RX_ENC_HT) /* HT info */
161                 len += 3;
162
163         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
164                 len = ALIGN(len, 4);
165                 len += 8;
166         }
167
168         if (status->encoding == RX_ENC_VHT) {
169                 len = ALIGN(len, 2);
170                 len += 12;
171         }
172
173         if (local->hw.radiotap_timestamp.units_pos >= 0) {
174                 len = ALIGN(len, 8);
175                 len += 12;
176         }
177
178         if (status->encoding == RX_ENC_HE &&
179             status->flag & RX_FLAG_RADIOTAP_HE) {
180                 len = ALIGN(len, 2);
181                 len += 12;
182                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
183         }
184
185         if (status->encoding == RX_ENC_HE &&
186             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
187                 len = ALIGN(len, 2);
188                 len += 12;
189                 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
190         }
191
192         if (status->chains) {
193                 /* antenna and antenna signal fields */
194                 len += 2 * hweight8(status->chains);
195         }
196
197         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
198                 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
199
200                 /* vendor presence bitmap */
201                 len += 4;
202                 /* alignment for fixed 6-byte vendor data header */
203                 len = ALIGN(len, 2);
204                 /* vendor data header */
205                 len += 6;
206                 if (WARN_ON(rtap->align == 0))
207                         rtap->align = 1;
208                 len = ALIGN(len, rtap->align);
209                 len += rtap->len + rtap->pad;
210         }
211
212         return len;
213 }
214
215 static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
216                                          struct sk_buff *skb,
217                                          int rtap_space)
218 {
219         struct {
220                 struct ieee80211_hdr_3addr hdr;
221                 u8 category;
222                 u8 action_code;
223         } __packed action;
224
225         if (!sdata)
226                 return;
227
228         BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
229
230         if (skb->len < rtap_space + sizeof(action) +
231                        VHT_MUMIMO_GROUPS_DATA_LEN)
232                 return;
233
234         if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
235                 return;
236
237         skb_copy_bits(skb, rtap_space, &action, sizeof(action));
238
239         if (!ieee80211_is_action(action.hdr.frame_control))
240                 return;
241
242         if (action.category != WLAN_CATEGORY_VHT)
243                 return;
244
245         if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
246                 return;
247
248         if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
249                 return;
250
251         skb = skb_copy(skb, GFP_ATOMIC);
252         if (!skb)
253                 return;
254
255         skb_queue_tail(&sdata->skb_queue, skb);
256         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
257 }
258
259 /*
260  * ieee80211_add_rx_radiotap_header - add radiotap header
261  *
262  * add a radiotap header containing all the fields which the hardware provided.
263  */
264 static void
265 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
266                                  struct sk_buff *skb,
267                                  struct ieee80211_rate *rate,
268                                  int rtap_len, bool has_fcs)
269 {
270         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
271         struct ieee80211_radiotap_header *rthdr;
272         unsigned char *pos;
273         __le32 *it_present;
274         u32 it_present_val;
275         u16 rx_flags = 0;
276         u16 channel_flags = 0;
277         int mpdulen, chain;
278         unsigned long chains = status->chains;
279         struct ieee80211_vendor_radiotap rtap = {};
280         struct ieee80211_radiotap_he he = {};
281         struct ieee80211_radiotap_he_mu he_mu = {};
282
283         if (status->flag & RX_FLAG_RADIOTAP_HE) {
284                 he = *(struct ieee80211_radiotap_he *)skb->data;
285                 skb_pull(skb, sizeof(he));
286                 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
287         }
288
289         if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
290                 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
291                 skb_pull(skb, sizeof(he_mu));
292         }
293
294         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
295                 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
296                 /* rtap.len and rtap.pad are undone immediately */
297                 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
298         }
299
300         mpdulen = skb->len;
301         if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
302                 mpdulen += FCS_LEN;
303
304         rthdr = skb_push(skb, rtap_len);
305         memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
306         it_present = &rthdr->it_present;
307
308         /* radiotap header, set always present flags */
309         rthdr->it_len = cpu_to_le16(rtap_len);
310         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
311                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
312                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
313
314         if (!status->chains)
315                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
316
317         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
318                 it_present_val |=
319                         BIT(IEEE80211_RADIOTAP_EXT) |
320                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
321                 put_unaligned_le32(it_present_val, it_present);
322                 it_present++;
323                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
324                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
325         }
326
327         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
328                 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
329                                   BIT(IEEE80211_RADIOTAP_EXT);
330                 put_unaligned_le32(it_present_val, it_present);
331                 it_present++;
332                 it_present_val = rtap.present;
333         }
334
335         put_unaligned_le32(it_present_val, it_present);
336
337         pos = (void *)(it_present + 1);
338
339         /* the order of the following fields is important */
340
341         /* IEEE80211_RADIOTAP_TSFT */
342         if (ieee80211_have_rx_timestamp(status)) {
343                 /* padding */
344                 while ((pos - (u8 *)rthdr) & 7)
345                         *pos++ = 0;
346                 put_unaligned_le64(
347                         ieee80211_calculate_rx_timestamp(local, status,
348                                                          mpdulen, 0),
349                         pos);
350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
351                 pos += 8;
352         }
353
354         /* IEEE80211_RADIOTAP_FLAGS */
355         if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
356                 *pos |= IEEE80211_RADIOTAP_F_FCS;
357         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
358                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
359         if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
360                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
361         pos++;
362
363         /* IEEE80211_RADIOTAP_RATE */
364         if (!rate || status->encoding != RX_ENC_LEGACY) {
365                 /*
366                  * Without rate information don't add it. If we have,
367                  * MCS information is a separate field in radiotap,
368                  * added below. The byte here is needed as padding
369                  * for the channel though, so initialise it to 0.
370                  */
371                 *pos = 0;
372         } else {
373                 int shift = 0;
374                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
375                 if (status->bw == RATE_INFO_BW_10)
376                         shift = 1;
377                 else if (status->bw == RATE_INFO_BW_5)
378                         shift = 2;
379                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
380         }
381         pos++;
382
383         /* IEEE80211_RADIOTAP_CHANNEL */
384         put_unaligned_le16(status->freq, pos);
385         pos += 2;
386         if (status->bw == RATE_INFO_BW_10)
387                 channel_flags |= IEEE80211_CHAN_HALF;
388         else if (status->bw == RATE_INFO_BW_5)
389                 channel_flags |= IEEE80211_CHAN_QUARTER;
390
391         if (status->band == NL80211_BAND_5GHZ)
392                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
393         else if (status->encoding != RX_ENC_LEGACY)
394                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
395         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
396                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
397         else if (rate)
398                 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
399         else
400                 channel_flags |= IEEE80211_CHAN_2GHZ;
401         put_unaligned_le16(channel_flags, pos);
402         pos += 2;
403
404         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
405         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
406             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
407                 *pos = status->signal;
408                 rthdr->it_present |=
409                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
410                 pos++;
411         }
412
413         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
414
415         if (!status->chains) {
416                 /* IEEE80211_RADIOTAP_ANTENNA */
417                 *pos = status->antenna;
418                 pos++;
419         }
420
421         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
422
423         /* IEEE80211_RADIOTAP_RX_FLAGS */
424         /* ensure 2 byte alignment for the 2 byte field as required */
425         if ((pos - (u8 *)rthdr) & 1)
426                 *pos++ = 0;
427         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
428                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
429         put_unaligned_le16(rx_flags, pos);
430         pos += 2;
431
432         if (status->encoding == RX_ENC_HT) {
433                 unsigned int stbc;
434
435                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
436                 *pos++ = local->hw.radiotap_mcs_details;
437                 *pos = 0;
438                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
439                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
440                 if (status->bw == RATE_INFO_BW_40)
441                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
442                 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
443                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
444                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
445                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
446                 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
447                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
448                 pos++;
449                 *pos++ = status->rate_idx;
450         }
451
452         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
453                 u16 flags = 0;
454
455                 /* ensure 4 byte alignment */
456                 while ((pos - (u8 *)rthdr) & 3)
457                         pos++;
458                 rthdr->it_present |=
459                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
460                 put_unaligned_le32(status->ampdu_reference, pos);
461                 pos += 4;
462                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
463                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
464                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
465                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
466                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
467                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
468                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
469                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
470                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
471                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
472                 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
473                         flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
474                 put_unaligned_le16(flags, pos);
475                 pos += 2;
476                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
477                         *pos++ = status->ampdu_delimiter_crc;
478                 else
479                         *pos++ = 0;
480                 *pos++ = 0;
481         }
482
483         if (status->encoding == RX_ENC_VHT) {
484                 u16 known = local->hw.radiotap_vht_details;
485
486                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
487                 put_unaligned_le16(known, pos);
488                 pos += 2;
489                 /* flags */
490                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
491                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
492                 /* in VHT, STBC is binary */
493                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
494                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
495                 if (status->enc_flags & RX_ENC_FLAG_BF)
496                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
497                 pos++;
498                 /* bandwidth */
499                 switch (status->bw) {
500                 case RATE_INFO_BW_80:
501                         *pos++ = 4;
502                         break;
503                 case RATE_INFO_BW_160:
504                         *pos++ = 11;
505                         break;
506                 case RATE_INFO_BW_40:
507                         *pos++ = 1;
508                         break;
509                 default:
510                         *pos++ = 0;
511                 }
512                 /* MCS/NSS */
513                 *pos = (status->rate_idx << 4) | status->nss;
514                 pos += 4;
515                 /* coding field */
516                 if (status->enc_flags & RX_ENC_FLAG_LDPC)
517                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
518                 pos++;
519                 /* group ID */
520                 pos++;
521                 /* partial_aid */
522                 pos += 2;
523         }
524
525         if (local->hw.radiotap_timestamp.units_pos >= 0) {
526                 u16 accuracy = 0;
527                 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
528
529                 rthdr->it_present |=
530                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
531
532                 /* ensure 8 byte alignment */
533                 while ((pos - (u8 *)rthdr) & 7)
534                         pos++;
535
536                 put_unaligned_le64(status->device_timestamp, pos);
537                 pos += sizeof(u64);
538
539                 if (local->hw.radiotap_timestamp.accuracy >= 0) {
540                         accuracy = local->hw.radiotap_timestamp.accuracy;
541                         flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
542                 }
543                 put_unaligned_le16(accuracy, pos);
544                 pos += sizeof(u16);
545
546                 *pos++ = local->hw.radiotap_timestamp.units_pos;
547                 *pos++ = flags;
548         }
549
550         if (status->encoding == RX_ENC_HE &&
551             status->flag & RX_FLAG_RADIOTAP_HE) {
552 #define HE_PREP(f, val) cpu_to_le16(FIELD_PREP(IEEE80211_RADIOTAP_HE_##f, val))
553
554                 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
555                         he.data6 |= HE_PREP(DATA6_NSTS,
556                                             FIELD_GET(RX_ENC_FLAG_STBC_MASK,
557                                                       status->enc_flags));
558                         he.data3 |= HE_PREP(DATA3_STBC, 1);
559                 } else {
560                         he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
561                 }
562
563 #define CHECK_GI(s) \
564         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
565                      (int)NL80211_RATE_INFO_HE_GI_##s)
566
567                 CHECK_GI(0_8);
568                 CHECK_GI(1_6);
569                 CHECK_GI(3_2);
570
571                 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
572                 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
573                 he.data3 |= HE_PREP(DATA3_CODING,
574                                     !!(status->enc_flags & RX_ENC_FLAG_LDPC));
575
576                 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
577
578                 switch (status->bw) {
579                 case RATE_INFO_BW_20:
580                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
581                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
582                         break;
583                 case RATE_INFO_BW_40:
584                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
585                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
586                         break;
587                 case RATE_INFO_BW_80:
588                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
589                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
590                         break;
591                 case RATE_INFO_BW_160:
592                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
593                                             IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
594                         break;
595                 case RATE_INFO_BW_HE_RU:
596 #define CHECK_RU_ALLOC(s) \
597         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
598                      NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
599
600                         CHECK_RU_ALLOC(26);
601                         CHECK_RU_ALLOC(52);
602                         CHECK_RU_ALLOC(106);
603                         CHECK_RU_ALLOC(242);
604                         CHECK_RU_ALLOC(484);
605                         CHECK_RU_ALLOC(996);
606                         CHECK_RU_ALLOC(2x996);
607
608                         he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
609                                             status->he_ru + 4);
610                         break;
611                 default:
612                         WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
613                 }
614
615                 /* ensure 2 byte alignment */
616                 while ((pos - (u8 *)rthdr) & 1)
617                         pos++;
618                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
619                 memcpy(pos, &he, sizeof(he));
620                 pos += sizeof(he);
621         }
622
623         if (status->encoding == RX_ENC_HE &&
624             status->flag & RX_FLAG_RADIOTAP_HE_MU) {
625                 /* ensure 2 byte alignment */
626                 while ((pos - (u8 *)rthdr) & 1)
627                         pos++;
628                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
629                 memcpy(pos, &he_mu, sizeof(he_mu));
630                 pos += sizeof(he_mu);
631         }
632
633         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
634                 *pos++ = status->chain_signal[chain];
635                 *pos++ = chain;
636         }
637
638         if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
639                 /* ensure 2 byte alignment for the vendor field as required */
640                 if ((pos - (u8 *)rthdr) & 1)
641                         *pos++ = 0;
642                 *pos++ = rtap.oui[0];
643                 *pos++ = rtap.oui[1];
644                 *pos++ = rtap.oui[2];
645                 *pos++ = rtap.subns;
646                 put_unaligned_le16(rtap.len, pos);
647                 pos += 2;
648                 /* align the actual payload as requested */
649                 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
650                         *pos++ = 0;
651                 /* data (and possible padding) already follows */
652         }
653 }
654
655 static struct sk_buff *
656 ieee80211_make_monitor_skb(struct ieee80211_local *local,
657                            struct sk_buff **origskb,
658                            struct ieee80211_rate *rate,
659                            int rtap_space, bool use_origskb)
660 {
661         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
662         int rt_hdrlen, needed_headroom;
663         struct sk_buff *skb;
664
665         /* room for the radiotap header based on driver features */
666         rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
667         needed_headroom = rt_hdrlen - rtap_space;
668
669         if (use_origskb) {
670                 /* only need to expand headroom if necessary */
671                 skb = *origskb;
672                 *origskb = NULL;
673
674                 /*
675                  * This shouldn't trigger often because most devices have an
676                  * RX header they pull before we get here, and that should
677                  * be big enough for our radiotap information. We should
678                  * probably export the length to drivers so that we can have
679                  * them allocate enough headroom to start with.
680                  */
681                 if (skb_headroom(skb) < needed_headroom &&
682                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
683                         dev_kfree_skb(skb);
684                         return NULL;
685                 }
686         } else {
687                 /*
688                  * Need to make a copy and possibly remove radiotap header
689                  * and FCS from the original.
690                  */
691                 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
692
693                 if (!skb)
694                         return NULL;
695         }
696
697         /* prepend radiotap information */
698         ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
699
700         skb_reset_mac_header(skb);
701         skb->ip_summed = CHECKSUM_UNNECESSARY;
702         skb->pkt_type = PACKET_OTHERHOST;
703         skb->protocol = htons(ETH_P_802_2);
704
705         return skb;
706 }
707
708 /*
709  * This function copies a received frame to all monitor interfaces and
710  * returns a cleaned-up SKB that no longer includes the FCS nor the
711  * radiotap header the driver might have added.
712  */
713 static struct sk_buff *
714 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
715                      struct ieee80211_rate *rate)
716 {
717         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
718         struct ieee80211_sub_if_data *sdata;
719         struct sk_buff *monskb = NULL;
720         int present_fcs_len = 0;
721         unsigned int rtap_space = 0;
722         struct ieee80211_sub_if_data *monitor_sdata =
723                 rcu_dereference(local->monitor_sdata);
724         bool only_monitor = false;
725
726         if (status->flag & RX_FLAG_RADIOTAP_HE)
727                 rtap_space += sizeof(struct ieee80211_radiotap_he);
728
729         if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
730                 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
731
732         if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
733                 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
734
735                 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
736         }
737
738         /*
739          * First, we may need to make a copy of the skb because
740          *  (1) we need to modify it for radiotap (if not present), and
741          *  (2) the other RX handlers will modify the skb we got.
742          *
743          * We don't need to, of course, if we aren't going to return
744          * the SKB because it has a bad FCS/PLCP checksum.
745          */
746
747         if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
748                 if (unlikely(origskb->len <= FCS_LEN)) {
749                         /* driver bug */
750                         WARN_ON(1);
751                         dev_kfree_skb(origskb);
752                         return NULL;
753                 }
754                 present_fcs_len = FCS_LEN;
755         }
756
757         /* ensure hdr->frame_control and vendor radiotap data are in skb head */
758         if (!pskb_may_pull(origskb, 2 + rtap_space)) {
759                 dev_kfree_skb(origskb);
760                 return NULL;
761         }
762
763         only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
764
765         if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
766                 if (only_monitor) {
767                         dev_kfree_skb(origskb);
768                         return NULL;
769                 }
770
771                 remove_monitor_info(origskb, present_fcs_len, rtap_space);
772                 return origskb;
773         }
774
775         ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
776
777         list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
778                 bool last_monitor = list_is_last(&sdata->u.mntr.list,
779                                                  &local->mon_list);
780
781                 if (!monskb)
782                         monskb = ieee80211_make_monitor_skb(local, &origskb,
783                                                             rate, rtap_space,
784                                                             only_monitor &&
785                                                             last_monitor);
786
787                 if (monskb) {
788                         struct sk_buff *skb;
789
790                         if (last_monitor) {
791                                 skb = monskb;
792                                 monskb = NULL;
793                         } else {
794                                 skb = skb_clone(monskb, GFP_ATOMIC);
795                         }
796
797                         if (skb) {
798                                 skb->dev = sdata->dev;
799                                 ieee80211_rx_stats(skb->dev, skb->len);
800                                 netif_receive_skb(skb);
801                         }
802                 }
803
804                 if (last_monitor)
805                         break;
806         }
807
808         /* this happens if last_monitor was erroneously false */
809         dev_kfree_skb(monskb);
810
811         /* ditto */
812         if (!origskb)
813                 return NULL;
814
815         remove_monitor_info(origskb, present_fcs_len, rtap_space);
816         return origskb;
817 }
818
819 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
820 {
821         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
822         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
823         int tid, seqno_idx, security_idx;
824
825         /* does the frame have a qos control field? */
826         if (ieee80211_is_data_qos(hdr->frame_control)) {
827                 u8 *qc = ieee80211_get_qos_ctl(hdr);
828                 /* frame has qos control */
829                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
830                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
831                         status->rx_flags |= IEEE80211_RX_AMSDU;
832
833                 seqno_idx = tid;
834                 security_idx = tid;
835         } else {
836                 /*
837                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
838                  *
839                  *      Sequence numbers for management frames, QoS data
840                  *      frames with a broadcast/multicast address in the
841                  *      Address 1 field, and all non-QoS data frames sent
842                  *      by QoS STAs are assigned using an additional single
843                  *      modulo-4096 counter, [...]
844                  *
845                  * We also use that counter for non-QoS STAs.
846                  */
847                 seqno_idx = IEEE80211_NUM_TIDS;
848                 security_idx = 0;
849                 if (ieee80211_is_mgmt(hdr->frame_control))
850                         security_idx = IEEE80211_NUM_TIDS;
851                 tid = 0;
852         }
853
854         rx->seqno_idx = seqno_idx;
855         rx->security_idx = security_idx;
856         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
857          * For now, set skb->priority to 0 for other cases. */
858         rx->skb->priority = (tid > 7) ? 0 : tid;
859 }
860
861 /**
862  * DOC: Packet alignment
863  *
864  * Drivers always need to pass packets that are aligned to two-byte boundaries
865  * to the stack.
866  *
867  * Additionally, should, if possible, align the payload data in a way that
868  * guarantees that the contained IP header is aligned to a four-byte
869  * boundary. In the case of regular frames, this simply means aligning the
870  * payload to a four-byte boundary (because either the IP header is directly
871  * contained, or IV/RFC1042 headers that have a length divisible by four are
872  * in front of it).  If the payload data is not properly aligned and the
873  * architecture doesn't support efficient unaligned operations, mac80211
874  * will align the data.
875  *
876  * With A-MSDU frames, however, the payload data address must yield two modulo
877  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
878  * push the IP header further back to a multiple of four again. Thankfully, the
879  * specs were sane enough this time around to require padding each A-MSDU
880  * subframe to a length that is a multiple of four.
881  *
882  * Padding like Atheros hardware adds which is between the 802.11 header and
883  * the payload is not supported, the driver is required to move the 802.11
884  * header to be directly in front of the payload in that case.
885  */
886 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
887 {
888 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
889         WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
890 #endif
891 }
892
893
894 /* rx handlers */
895
896 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
897 {
898         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
899
900         if (is_multicast_ether_addr(hdr->addr1))
901                 return 0;
902
903         return ieee80211_is_robust_mgmt_frame(skb);
904 }
905
906
907 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
908 {
909         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
910
911         if (!is_multicast_ether_addr(hdr->addr1))
912                 return 0;
913
914         return ieee80211_is_robust_mgmt_frame(skb);
915 }
916
917
918 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
919 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
920 {
921         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
922         struct ieee80211_mmie *mmie;
923         struct ieee80211_mmie_16 *mmie16;
924
925         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
926                 return -1;
927
928         if (!ieee80211_is_robust_mgmt_frame(skb))
929                 return -1; /* not a robust management frame */
930
931         mmie = (struct ieee80211_mmie *)
932                 (skb->data + skb->len - sizeof(*mmie));
933         if (mmie->element_id == WLAN_EID_MMIE &&
934             mmie->length == sizeof(*mmie) - 2)
935                 return le16_to_cpu(mmie->key_id);
936
937         mmie16 = (struct ieee80211_mmie_16 *)
938                 (skb->data + skb->len - sizeof(*mmie16));
939         if (skb->len >= 24 + sizeof(*mmie16) &&
940             mmie16->element_id == WLAN_EID_MMIE &&
941             mmie16->length == sizeof(*mmie16) - 2)
942                 return le16_to_cpu(mmie16->key_id);
943
944         return -1;
945 }
946
947 static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
948                                   struct sk_buff *skb)
949 {
950         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
951         __le16 fc;
952         int hdrlen;
953         u8 keyid;
954
955         fc = hdr->frame_control;
956         hdrlen = ieee80211_hdrlen(fc);
957
958         if (skb->len < hdrlen + cs->hdr_len)
959                 return -EINVAL;
960
961         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
962         keyid &= cs->key_idx_mask;
963         keyid >>= cs->key_idx_shift;
964
965         return keyid;
966 }
967
968 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
969 {
970         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
971         char *dev_addr = rx->sdata->vif.addr;
972
973         if (ieee80211_is_data(hdr->frame_control)) {
974                 if (is_multicast_ether_addr(hdr->addr1)) {
975                         if (ieee80211_has_tods(hdr->frame_control) ||
976                             !ieee80211_has_fromds(hdr->frame_control))
977                                 return RX_DROP_MONITOR;
978                         if (ether_addr_equal(hdr->addr3, dev_addr))
979                                 return RX_DROP_MONITOR;
980                 } else {
981                         if (!ieee80211_has_a4(hdr->frame_control))
982                                 return RX_DROP_MONITOR;
983                         if (ether_addr_equal(hdr->addr4, dev_addr))
984                                 return RX_DROP_MONITOR;
985                 }
986         }
987
988         /* If there is not an established peer link and this is not a peer link
989          * establisment frame, beacon or probe, drop the frame.
990          */
991
992         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
993                 struct ieee80211_mgmt *mgmt;
994
995                 if (!ieee80211_is_mgmt(hdr->frame_control))
996                         return RX_DROP_MONITOR;
997
998                 if (ieee80211_is_action(hdr->frame_control)) {
999                         u8 category;
1000
1001                         /* make sure category field is present */
1002                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1003                                 return RX_DROP_MONITOR;
1004
1005                         mgmt = (struct ieee80211_mgmt *)hdr;
1006                         category = mgmt->u.action.category;
1007                         if (category != WLAN_CATEGORY_MESH_ACTION &&
1008                             category != WLAN_CATEGORY_SELF_PROTECTED)
1009                                 return RX_DROP_MONITOR;
1010                         return RX_CONTINUE;
1011                 }
1012
1013                 if (ieee80211_is_probe_req(hdr->frame_control) ||
1014                     ieee80211_is_probe_resp(hdr->frame_control) ||
1015                     ieee80211_is_beacon(hdr->frame_control) ||
1016                     ieee80211_is_auth(hdr->frame_control))
1017                         return RX_CONTINUE;
1018
1019                 return RX_DROP_MONITOR;
1020         }
1021
1022         return RX_CONTINUE;
1023 }
1024
1025 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1026                                               int index)
1027 {
1028         struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1029         struct sk_buff *tail = skb_peek_tail(frames);
1030         struct ieee80211_rx_status *status;
1031
1032         if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1033                 return true;
1034
1035         if (!tail)
1036                 return false;
1037
1038         status = IEEE80211_SKB_RXCB(tail);
1039         if (status->flag & RX_FLAG_AMSDU_MORE)
1040                 return false;
1041
1042         return true;
1043 }
1044
1045 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1046                                             struct tid_ampdu_rx *tid_agg_rx,
1047                                             int index,
1048                                             struct sk_buff_head *frames)
1049 {
1050         struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1051         struct sk_buff *skb;
1052         struct ieee80211_rx_status *status;
1053
1054         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1055
1056         if (skb_queue_empty(skb_list))
1057                 goto no_frame;
1058
1059         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1060                 __skb_queue_purge(skb_list);
1061                 goto no_frame;
1062         }
1063
1064         /* release frames from the reorder ring buffer */
1065         tid_agg_rx->stored_mpdu_num--;
1066         while ((skb = __skb_dequeue(skb_list))) {
1067                 status = IEEE80211_SKB_RXCB(skb);
1068                 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1069                 __skb_queue_tail(frames, skb);
1070         }
1071
1072 no_frame:
1073         tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
1074         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1075 }
1076
1077 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1078                                              struct tid_ampdu_rx *tid_agg_rx,
1079                                              u16 head_seq_num,
1080                                              struct sk_buff_head *frames)
1081 {
1082         int index;
1083
1084         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1085
1086         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
1087                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1088                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1089                                                 frames);
1090         }
1091 }
1092
1093 /*
1094  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1095  * the skb was added to the buffer longer than this time ago, the earlier
1096  * frames that have not yet been received are assumed to be lost and the skb
1097  * can be released for processing. This may also release other skb's from the
1098  * reorder buffer if there are no additional gaps between the frames.
1099  *
1100  * Callers must hold tid_agg_rx->reorder_lock.
1101  */
1102 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1103
1104 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
1105                                           struct tid_ampdu_rx *tid_agg_rx,
1106                                           struct sk_buff_head *frames)
1107 {
1108         int index, i, j;
1109
1110         lockdep_assert_held(&tid_agg_rx->reorder_lock);
1111
1112         /* release the buffer until next missing frame */
1113         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1114         if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
1115             tid_agg_rx->stored_mpdu_num) {
1116                 /*
1117                  * No buffers ready to be released, but check whether any
1118                  * frames in the reorder buffer have timed out.
1119                  */
1120                 int skipped = 1;
1121                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1122                      j = (j + 1) % tid_agg_rx->buf_size) {
1123                         if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
1124                                 skipped++;
1125                                 continue;
1126                         }
1127                         if (skipped &&
1128                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
1129                                         HT_RX_REORDER_BUF_TIMEOUT))
1130                                 goto set_release_timer;
1131
1132                         /* don't leave incomplete A-MSDUs around */
1133                         for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1134                              i = (i + 1) % tid_agg_rx->buf_size)
1135                                 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1136
1137                         ht_dbg_ratelimited(sdata,
1138                                            "release an RX reorder frame due to timeout on earlier frames\n");
1139                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1140                                                         frames);
1141
1142                         /*
1143                          * Increment the head seq# also for the skipped slots.
1144                          */
1145                         tid_agg_rx->head_seq_num =
1146                                 (tid_agg_rx->head_seq_num +
1147                                  skipped) & IEEE80211_SN_MASK;
1148                         skipped = 0;
1149                 }
1150         } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1151                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1152                                                 frames);
1153                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1154         }
1155
1156         if (tid_agg_rx->stored_mpdu_num) {
1157                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1158
1159                 for (; j != (index - 1) % tid_agg_rx->buf_size;
1160                      j = (j + 1) % tid_agg_rx->buf_size) {
1161                         if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1162                                 break;
1163                 }
1164
1165  set_release_timer:
1166
1167                 if (!tid_agg_rx->removed)
1168                         mod_timer(&tid_agg_rx->reorder_timer,
1169                                   tid_agg_rx->reorder_time[j] + 1 +
1170                                   HT_RX_REORDER_BUF_TIMEOUT);
1171         } else {
1172                 del_timer(&tid_agg_rx->reorder_timer);
1173         }
1174 }
1175
1176 /*
1177  * As this function belongs to the RX path it must be under
1178  * rcu_read_lock protection. It returns false if the frame
1179  * can be processed immediately, true if it was consumed.
1180  */
1181 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1182                                              struct tid_ampdu_rx *tid_agg_rx,
1183                                              struct sk_buff *skb,
1184                                              struct sk_buff_head *frames)
1185 {
1186         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1187         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1188         u16 sc = le16_to_cpu(hdr->seq_ctrl);
1189         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1190         u16 head_seq_num, buf_size;
1191         int index;
1192         bool ret = true;
1193
1194         spin_lock(&tid_agg_rx->reorder_lock);
1195
1196         /*
1197          * Offloaded BA sessions have no known starting sequence number so pick
1198          * one from first Rxed frame for this tid after BA was started.
1199          */
1200         if (unlikely(tid_agg_rx->auto_seq)) {
1201                 tid_agg_rx->auto_seq = false;
1202                 tid_agg_rx->ssn = mpdu_seq_num;
1203                 tid_agg_rx->head_seq_num = mpdu_seq_num;
1204         }
1205
1206         buf_size = tid_agg_rx->buf_size;
1207         head_seq_num = tid_agg_rx->head_seq_num;
1208
1209         /*
1210          * If the current MPDU's SN is smaller than the SSN, it shouldn't
1211          * be reordered.
1212          */
1213         if (unlikely(!tid_agg_rx->started)) {
1214                 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1215                         ret = false;
1216                         goto out;
1217                 }
1218                 tid_agg_rx->started = true;
1219         }
1220
1221         /* frame with out of date sequence number */
1222         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1223                 dev_kfree_skb(skb);
1224                 goto out;
1225         }
1226
1227         /*
1228          * If frame the sequence number exceeds our buffering window
1229          * size release some previous frames to make room for this one.
1230          */
1231         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1232                 head_seq_num = ieee80211_sn_inc(
1233                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1234                 /* release stored frames up to new head to stack */
1235                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1236                                                  head_seq_num, frames);
1237         }
1238
1239         /* Now the new frame is always in the range of the reordering buffer */
1240
1241         index = mpdu_seq_num % tid_agg_rx->buf_size;
1242
1243         /* check if we already stored this frame */
1244         if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1245                 dev_kfree_skb(skb);
1246                 goto out;
1247         }
1248
1249         /*
1250          * If the current MPDU is in the right order and nothing else
1251          * is stored we can process it directly, no need to buffer it.
1252          * If it is first but there's something stored, we may be able
1253          * to release frames after this one.
1254          */
1255         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1256             tid_agg_rx->stored_mpdu_num == 0) {
1257                 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1258                         tid_agg_rx->head_seq_num =
1259                                 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1260                 ret = false;
1261                 goto out;
1262         }
1263
1264         /* put the frame in the reordering buffer */
1265         __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1266         if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1267                 tid_agg_rx->reorder_time[index] = jiffies;
1268                 tid_agg_rx->stored_mpdu_num++;
1269                 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1270         }
1271
1272  out:
1273         spin_unlock(&tid_agg_rx->reorder_lock);
1274         return ret;
1275 }
1276
1277 /*
1278  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1279  * true if the MPDU was buffered, false if it should be processed.
1280  */
1281 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1282                                        struct sk_buff_head *frames)
1283 {
1284         struct sk_buff *skb = rx->skb;
1285         struct ieee80211_local *local = rx->local;
1286         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1287         struct sta_info *sta = rx->sta;
1288         struct tid_ampdu_rx *tid_agg_rx;
1289         u16 sc;
1290         u8 tid, ack_policy;
1291
1292         if (!ieee80211_is_data_qos(hdr->frame_control) ||
1293             is_multicast_ether_addr(hdr->addr1))
1294                 goto dont_reorder;
1295
1296         /*
1297          * filter the QoS data rx stream according to
1298          * STA/TID and check if this STA/TID is on aggregation
1299          */
1300
1301         if (!sta)
1302                 goto dont_reorder;
1303
1304         ack_policy = *ieee80211_get_qos_ctl(hdr) &
1305                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1306         tid = ieee80211_get_tid(hdr);
1307
1308         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1309         if (!tid_agg_rx) {
1310                 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1311                     !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1312                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1313                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1314                                              WLAN_BACK_RECIPIENT,
1315                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
1316                 goto dont_reorder;
1317         }
1318
1319         /* qos null data frames are excluded */
1320         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1321                 goto dont_reorder;
1322
1323         /* not part of a BA session */
1324         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1325             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1326                 goto dont_reorder;
1327
1328         /* new, potentially un-ordered, ampdu frame - process it */
1329
1330         /* reset session timer */
1331         if (tid_agg_rx->timeout)
1332                 tid_agg_rx->last_rx = jiffies;
1333
1334         /* if this mpdu is fragmented - terminate rx aggregation session */
1335         sc = le16_to_cpu(hdr->seq_ctrl);
1336         if (sc & IEEE80211_SCTL_FRAG) {
1337                 skb_queue_tail(&rx->sdata->skb_queue, skb);
1338                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1339                 return;
1340         }
1341
1342         /*
1343          * No locking needed -- we will only ever process one
1344          * RX packet at a time, and thus own tid_agg_rx. All
1345          * other code manipulating it needs to (and does) make
1346          * sure that we cannot get to it any more before doing
1347          * anything with it.
1348          */
1349         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1350                                              frames))
1351                 return;
1352
1353  dont_reorder:
1354         __skb_queue_tail(frames, skb);
1355 }
1356
1357 static ieee80211_rx_result debug_noinline
1358 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1359 {
1360         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1361         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1362
1363         if (status->flag & RX_FLAG_DUP_VALIDATED)
1364                 return RX_CONTINUE;
1365
1366         /*
1367          * Drop duplicate 802.11 retransmissions
1368          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1369          */
1370
1371         if (rx->skb->len < 24)
1372                 return RX_CONTINUE;
1373
1374         if (ieee80211_is_ctl(hdr->frame_control) ||
1375             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1376             is_multicast_ether_addr(hdr->addr1))
1377                 return RX_CONTINUE;
1378
1379         if (!rx->sta)
1380                 return RX_CONTINUE;
1381
1382         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1383                      rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1384                 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1385                 rx->sta->rx_stats.num_duplicates++;
1386                 return RX_DROP_UNUSABLE;
1387         } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1388                 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1389         }
1390
1391         return RX_CONTINUE;
1392 }
1393
1394 static ieee80211_rx_result debug_noinline
1395 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1396 {
1397         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1398
1399         /* Drop disallowed frame classes based on STA auth/assoc state;
1400          * IEEE 802.11, Chap 5.5.
1401          *
1402          * mac80211 filters only based on association state, i.e. it drops
1403          * Class 3 frames from not associated stations. hostapd sends
1404          * deauth/disassoc frames when needed. In addition, hostapd is
1405          * responsible for filtering on both auth and assoc states.
1406          */
1407
1408         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1409                 return ieee80211_rx_mesh_check(rx);
1410
1411         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1412                       ieee80211_is_pspoll(hdr->frame_control)) &&
1413                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1414                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1415                      rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1416                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1417                 /*
1418                  * accept port control frames from the AP even when it's not
1419                  * yet marked ASSOC to prevent a race where we don't set the
1420                  * assoc bit quickly enough before it sends the first frame
1421                  */
1422                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1423                     ieee80211_is_data_present(hdr->frame_control)) {
1424                         unsigned int hdrlen;
1425                         __be16 ethertype;
1426
1427                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1428
1429                         if (rx->skb->len < hdrlen + 8)
1430                                 return RX_DROP_MONITOR;
1431
1432                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1433                         if (ethertype == rx->sdata->control_port_protocol)
1434                                 return RX_CONTINUE;
1435                 }
1436
1437                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1438                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1439                                                hdr->addr2,
1440                                                GFP_ATOMIC))
1441                         return RX_DROP_UNUSABLE;
1442
1443                 return RX_DROP_MONITOR;
1444         }
1445
1446         return RX_CONTINUE;
1447 }
1448
1449
1450 static ieee80211_rx_result debug_noinline
1451 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1452 {
1453         struct ieee80211_local *local;
1454         struct ieee80211_hdr *hdr;
1455         struct sk_buff *skb;
1456
1457         local = rx->local;
1458         skb = rx->skb;
1459         hdr = (struct ieee80211_hdr *) skb->data;
1460
1461         if (!local->pspolling)
1462                 return RX_CONTINUE;
1463
1464         if (!ieee80211_has_fromds(hdr->frame_control))
1465                 /* this is not from AP */
1466                 return RX_CONTINUE;
1467
1468         if (!ieee80211_is_data(hdr->frame_control))
1469                 return RX_CONTINUE;
1470
1471         if (!ieee80211_has_moredata(hdr->frame_control)) {
1472                 /* AP has no more frames buffered for us */
1473                 local->pspolling = false;
1474                 return RX_CONTINUE;
1475         }
1476
1477         /* more data bit is set, let's request a new frame from the AP */
1478         ieee80211_send_pspoll(local, rx->sdata);
1479
1480         return RX_CONTINUE;
1481 }
1482
1483 static void sta_ps_start(struct sta_info *sta)
1484 {
1485         struct ieee80211_sub_if_data *sdata = sta->sdata;
1486         struct ieee80211_local *local = sdata->local;
1487         struct ps_data *ps;
1488         int tid;
1489
1490         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1491             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1492                 ps = &sdata->bss->ps;
1493         else
1494                 return;
1495
1496         atomic_inc(&ps->num_sta_ps);
1497         set_sta_flag(sta, WLAN_STA_PS_STA);
1498         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1499                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1500         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1501                sta->sta.addr, sta->sta.aid);
1502
1503         ieee80211_clear_fast_xmit(sta);
1504
1505         if (!sta->sta.txq[0])
1506                 return;
1507
1508         for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1509                 if (txq_has_queue(sta->sta.txq[tid]))
1510                         set_bit(tid, &sta->txq_buffered_tids);
1511                 else
1512                         clear_bit(tid, &sta->txq_buffered_tids);
1513         }
1514 }
1515
1516 static void sta_ps_end(struct sta_info *sta)
1517 {
1518         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1519                sta->sta.addr, sta->sta.aid);
1520
1521         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1522                 /*
1523                  * Clear the flag only if the other one is still set
1524                  * so that the TX path won't start TX'ing new frames
1525                  * directly ... In the case that the driver flag isn't
1526                  * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1527                  */
1528                 clear_sta_flag(sta, WLAN_STA_PS_STA);
1529                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1530                        sta->sta.addr, sta->sta.aid);
1531                 return;
1532         }
1533
1534         set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1535         clear_sta_flag(sta, WLAN_STA_PS_STA);
1536         ieee80211_sta_ps_deliver_wakeup(sta);
1537 }
1538
1539 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1540 {
1541         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1542         bool in_ps;
1543
1544         WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1545
1546         /* Don't let the same PS state be set twice */
1547         in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1548         if ((start && in_ps) || (!start && !in_ps))
1549                 return -EINVAL;
1550
1551         if (start)
1552                 sta_ps_start(sta);
1553         else
1554                 sta_ps_end(sta);
1555
1556         return 0;
1557 }
1558 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1559
1560 void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1561 {
1562         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1563
1564         if (test_sta_flag(sta, WLAN_STA_SP))
1565                 return;
1566
1567         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1568                 ieee80211_sta_ps_deliver_poll_response(sta);
1569         else
1570                 set_sta_flag(sta, WLAN_STA_PSPOLL);
1571 }
1572 EXPORT_SYMBOL(ieee80211_sta_pspoll);
1573
1574 void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1575 {
1576         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1577         int ac = ieee80211_ac_from_tid(tid);
1578
1579         /*
1580          * If this AC is not trigger-enabled do nothing unless the
1581          * driver is calling us after it already checked.
1582          *
1583          * NB: This could/should check a separate bitmap of trigger-
1584          * enabled queues, but for now we only implement uAPSD w/o
1585          * TSPEC changes to the ACs, so they're always the same.
1586          */
1587         if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1588             tid != IEEE80211_NUM_TIDS)
1589                 return;
1590
1591         /* if we are in a service period, do nothing */
1592         if (test_sta_flag(sta, WLAN_STA_SP))
1593                 return;
1594
1595         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1596                 ieee80211_sta_ps_deliver_uapsd(sta);
1597         else
1598                 set_sta_flag(sta, WLAN_STA_UAPSD);
1599 }
1600 EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1601
1602 static ieee80211_rx_result debug_noinline
1603 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1604 {
1605         struct ieee80211_sub_if_data *sdata = rx->sdata;
1606         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1607         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1608
1609         if (!rx->sta)
1610                 return RX_CONTINUE;
1611
1612         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1613             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1614                 return RX_CONTINUE;
1615
1616         /*
1617          * The device handles station powersave, so don't do anything about
1618          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1619          * it to mac80211 since they're handled.)
1620          */
1621         if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1622                 return RX_CONTINUE;
1623
1624         /*
1625          * Don't do anything if the station isn't already asleep. In
1626          * the uAPSD case, the station will probably be marked asleep,
1627          * in the PS-Poll case the station must be confused ...
1628          */
1629         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1630                 return RX_CONTINUE;
1631
1632         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1633                 ieee80211_sta_pspoll(&rx->sta->sta);
1634
1635                 /* Free PS Poll skb here instead of returning RX_DROP that would
1636                  * count as an dropped frame. */
1637                 dev_kfree_skb(rx->skb);
1638
1639                 return RX_QUEUED;
1640         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1641                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1642                    ieee80211_has_pm(hdr->frame_control) &&
1643                    (ieee80211_is_data_qos(hdr->frame_control) ||
1644                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1645                 u8 tid = ieee80211_get_tid(hdr);
1646
1647                 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1648         }
1649
1650         return RX_CONTINUE;
1651 }
1652
1653 static ieee80211_rx_result debug_noinline
1654 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1655 {
1656         struct sta_info *sta = rx->sta;
1657         struct sk_buff *skb = rx->skb;
1658         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1659         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1660         int i;
1661
1662         if (!sta)
1663                 return RX_CONTINUE;
1664
1665         /*
1666          * Update last_rx only for IBSS packets which are for the current
1667          * BSSID and for station already AUTHORIZED to avoid keeping the
1668          * current IBSS network alive in cases where other STAs start
1669          * using different BSSID. This will also give the station another
1670          * chance to restart the authentication/authorization in case
1671          * something went wrong the first time.
1672          */
1673         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1674                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1675                                                 NL80211_IFTYPE_ADHOC);
1676                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1677                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1678                         sta->rx_stats.last_rx = jiffies;
1679                         if (ieee80211_is_data(hdr->frame_control) &&
1680                             !is_multicast_ether_addr(hdr->addr1))
1681                                 sta->rx_stats.last_rate =
1682                                         sta_stats_encode_rate(status);
1683                 }
1684         } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1685                 sta->rx_stats.last_rx = jiffies;
1686         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1687                 /*
1688                  * Mesh beacons will update last_rx when if they are found to
1689                  * match the current local configuration when processed.
1690                  */
1691                 sta->rx_stats.last_rx = jiffies;
1692                 if (ieee80211_is_data(hdr->frame_control))
1693                         sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1694         }
1695
1696         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1697                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1698
1699         sta->rx_stats.fragments++;
1700
1701         u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1702         sta->rx_stats.bytes += rx->skb->len;
1703         u64_stats_update_end(&rx->sta->rx_stats.syncp);
1704
1705         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1706                 sta->rx_stats.last_signal = status->signal;
1707                 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1708         }
1709
1710         if (status->chains) {
1711                 sta->rx_stats.chains = status->chains;
1712                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1713                         int signal = status->chain_signal[i];
1714
1715                         if (!(status->chains & BIT(i)))
1716                                 continue;
1717
1718                         sta->rx_stats.chain_signal_last[i] = signal;
1719                         ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1720                                         -signal);
1721                 }
1722         }
1723
1724         /*
1725          * Change STA power saving mode only at the end of a frame
1726          * exchange sequence, and only for a data or management
1727          * frame as specified in IEEE 802.11-2016 11.2.3.2
1728          */
1729         if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1730             !ieee80211_has_morefrags(hdr->frame_control) &&
1731             !is_multicast_ether_addr(hdr->addr1) &&
1732             (ieee80211_is_mgmt(hdr->frame_control) ||
1733              ieee80211_is_data(hdr->frame_control)) &&
1734             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1735             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1736              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1737                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1738                         if (!ieee80211_has_pm(hdr->frame_control))
1739                                 sta_ps_end(sta);
1740                 } else {
1741                         if (ieee80211_has_pm(hdr->frame_control))
1742                                 sta_ps_start(sta);
1743                 }
1744         }
1745
1746         /* mesh power save support */
1747         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1748                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1749
1750         /*
1751          * Drop (qos-)data::nullfunc frames silently, since they
1752          * are used only to control station power saving mode.
1753          */
1754         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1755             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1756                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1757
1758                 /*
1759                  * If we receive a 4-addr nullfunc frame from a STA
1760                  * that was not moved to a 4-addr STA vlan yet send
1761                  * the event to userspace and for older hostapd drop
1762                  * the frame to the monitor interface.
1763                  */
1764                 if (ieee80211_has_a4(hdr->frame_control) &&
1765                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1766                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1767                       !rx->sdata->u.vlan.sta))) {
1768                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1769                                 cfg80211_rx_unexpected_4addr_frame(
1770                                         rx->sdata->dev, sta->sta.addr,
1771                                         GFP_ATOMIC);
1772                         return RX_DROP_MONITOR;
1773                 }
1774                 /*
1775                  * Update counter and free packet here to avoid
1776                  * counting this as a dropped packed.
1777                  */
1778                 sta->rx_stats.packets++;
1779                 dev_kfree_skb(rx->skb);
1780                 return RX_QUEUED;
1781         }
1782
1783         return RX_CONTINUE;
1784 } /* ieee80211_rx_h_sta_process */
1785
1786 static ieee80211_rx_result debug_noinline
1787 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1788 {
1789         struct sk_buff *skb = rx->skb;
1790         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1791         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1792         int keyidx;
1793         int hdrlen;
1794         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1795         struct ieee80211_key *sta_ptk = NULL;
1796         int mmie_keyidx = -1;
1797         __le16 fc;
1798         const struct ieee80211_cipher_scheme *cs = NULL;
1799
1800         /*
1801          * Key selection 101
1802          *
1803          * There are four types of keys:
1804          *  - GTK (group keys)
1805          *  - IGTK (group keys for management frames)
1806          *  - PTK (pairwise keys)
1807          *  - STK (station-to-station pairwise keys)
1808          *
1809          * When selecting a key, we have to distinguish between multicast
1810          * (including broadcast) and unicast frames, the latter can only
1811          * use PTKs and STKs while the former always use GTKs and IGTKs.
1812          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1813          * unicast frames can also use key indices like GTKs. Hence, if we
1814          * don't have a PTK/STK we check the key index for a WEP key.
1815          *
1816          * Note that in a regular BSS, multicast frames are sent by the
1817          * AP only, associated stations unicast the frame to the AP first
1818          * which then multicasts it on their behalf.
1819          *
1820          * There is also a slight problem in IBSS mode: GTKs are negotiated
1821          * with each station, that is something we don't currently handle.
1822          * The spec seems to expect that one negotiates the same key with
1823          * every station but there's no such requirement; VLANs could be
1824          * possible.
1825          */
1826
1827         /* start without a key */
1828         rx->key = NULL;
1829         fc = hdr->frame_control;
1830
1831         if (rx->sta) {
1832                 int keyid = rx->sta->ptk_idx;
1833
1834                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1835                         cs = rx->sta->cipher_scheme;
1836                         keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1837                         if (unlikely(keyid < 0))
1838                                 return RX_DROP_UNUSABLE;
1839                 }
1840                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1841         }
1842
1843         if (!ieee80211_has_protected(fc))
1844                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1845
1846         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1847                 rx->key = sta_ptk;
1848                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1849                     (status->flag & RX_FLAG_IV_STRIPPED))
1850                         return RX_CONTINUE;
1851                 /* Skip decryption if the frame is not protected. */
1852                 if (!ieee80211_has_protected(fc))
1853                         return RX_CONTINUE;
1854         } else if (mmie_keyidx >= 0) {
1855                 /* Broadcast/multicast robust management frame / BIP */
1856                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1857                     (status->flag & RX_FLAG_IV_STRIPPED))
1858                         return RX_CONTINUE;
1859
1860                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1861                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1862                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1863                 if (rx->sta) {
1864                         if (ieee80211_is_group_privacy_action(skb) &&
1865                             test_sta_flag(rx->sta, WLAN_STA_MFP))
1866                                 return RX_DROP_MONITOR;
1867
1868                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1869                 }
1870                 if (!rx->key)
1871                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1872         } else if (!ieee80211_has_protected(fc)) {
1873                 /*
1874                  * The frame was not protected, so skip decryption. However, we
1875                  * need to set rx->key if there is a key that could have been
1876                  * used so that the frame may be dropped if encryption would
1877                  * have been expected.
1878                  */
1879                 struct ieee80211_key *key = NULL;
1880                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1881                 int i;
1882
1883                 if (ieee80211_is_mgmt(fc) &&
1884                     is_multicast_ether_addr(hdr->addr1) &&
1885                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1886                         rx->key = key;
1887                 else {
1888                         if (rx->sta) {
1889                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1890                                         key = rcu_dereference(rx->sta->gtk[i]);
1891                                         if (key)
1892                                                 break;
1893                                 }
1894                         }
1895                         if (!key) {
1896                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1897                                         key = rcu_dereference(sdata->keys[i]);
1898                                         if (key)
1899                                                 break;
1900                                 }
1901                         }
1902                         if (key)
1903                                 rx->key = key;
1904                 }
1905                 return RX_CONTINUE;
1906         } else {
1907                 u8 keyid;
1908
1909                 /*
1910                  * The device doesn't give us the IV so we won't be
1911                  * able to look up the key. That's ok though, we
1912                  * don't need to decrypt the frame, we just won't
1913                  * be able to keep statistics accurate.
1914                  * Except for key threshold notifications, should
1915                  * we somehow allow the driver to tell us which key
1916                  * the hardware used if this flag is set?
1917                  */
1918                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1919                     (status->flag & RX_FLAG_IV_STRIPPED))
1920                         return RX_CONTINUE;
1921
1922                 hdrlen = ieee80211_hdrlen(fc);
1923
1924                 if (cs) {
1925                         keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1926
1927                         if (unlikely(keyidx < 0))
1928                                 return RX_DROP_UNUSABLE;
1929                 } else {
1930                         if (rx->skb->len < 8 + hdrlen)
1931                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1932                         /*
1933                          * no need to call ieee80211_wep_get_keyidx,
1934                          * it verifies a bunch of things we've done already
1935                          */
1936                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1937                         keyidx = keyid >> 6;
1938                 }
1939
1940                 /* check per-station GTK first, if multicast packet */
1941                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1942                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1943
1944                 /* if not found, try default key */
1945                 if (!rx->key) {
1946                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1947
1948                         /*
1949                          * RSNA-protected unicast frames should always be
1950                          * sent with pairwise or station-to-station keys,
1951                          * but for WEP we allow using a key index as well.
1952                          */
1953                         if (rx->key &&
1954                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1955                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1956                             !is_multicast_ether_addr(hdr->addr1))
1957                                 rx->key = NULL;
1958                 }
1959         }
1960
1961         if (rx->key) {
1962                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1963                         return RX_DROP_MONITOR;
1964
1965                 /* TODO: add threshold stuff again */
1966         } else {
1967                 return RX_DROP_MONITOR;
1968         }
1969
1970         switch (rx->key->conf.cipher) {
1971         case WLAN_CIPHER_SUITE_WEP40:
1972         case WLAN_CIPHER_SUITE_WEP104:
1973                 result = ieee80211_crypto_wep_decrypt(rx);
1974                 break;
1975         case WLAN_CIPHER_SUITE_TKIP:
1976                 result = ieee80211_crypto_tkip_decrypt(rx);
1977                 break;
1978         case WLAN_CIPHER_SUITE_CCMP:
1979                 result = ieee80211_crypto_ccmp_decrypt(
1980                         rx, IEEE80211_CCMP_MIC_LEN);
1981                 break;
1982         case WLAN_CIPHER_SUITE_CCMP_256:
1983                 result = ieee80211_crypto_ccmp_decrypt(
1984                         rx, IEEE80211_CCMP_256_MIC_LEN);
1985                 break;
1986         case WLAN_CIPHER_SUITE_AES_CMAC:
1987                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1988                 break;
1989         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1990                 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1991                 break;
1992         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1993         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1994                 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1995                 break;
1996         case WLAN_CIPHER_SUITE_GCMP:
1997         case WLAN_CIPHER_SUITE_GCMP_256:
1998                 result = ieee80211_crypto_gcmp_decrypt(rx);
1999                 break;
2000         default:
2001                 result = ieee80211_crypto_hw_decrypt(rx);
2002         }
2003
2004         /* the hdr variable is invalid after the decrypt handlers */
2005
2006         /* either the frame has been decrypted or will be dropped */
2007         status->flag |= RX_FLAG_DECRYPTED;
2008
2009         return result;
2010 }
2011
2012 static inline struct ieee80211_fragment_entry *
2013 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2014                          unsigned int frag, unsigned int seq, int rx_queue,
2015                          struct sk_buff **skb)
2016 {
2017         struct ieee80211_fragment_entry *entry;
2018
2019         entry = &sdata->fragments[sdata->fragment_next++];
2020         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2021                 sdata->fragment_next = 0;
2022
2023         if (!skb_queue_empty(&entry->skb_list))
2024                 __skb_queue_purge(&entry->skb_list);
2025
2026         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2027         *skb = NULL;
2028         entry->first_frag_time = jiffies;
2029         entry->seq = seq;
2030         entry->rx_queue = rx_queue;
2031         entry->last_frag = frag;
2032         entry->check_sequential_pn = false;
2033         entry->extra_len = 0;
2034
2035         return entry;
2036 }
2037
2038 static inline struct ieee80211_fragment_entry *
2039 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
2040                           unsigned int frag, unsigned int seq,
2041                           int rx_queue, struct ieee80211_hdr *hdr)
2042 {
2043         struct ieee80211_fragment_entry *entry;
2044         int i, idx;
2045
2046         idx = sdata->fragment_next;
2047         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2048                 struct ieee80211_hdr *f_hdr;
2049
2050                 idx--;
2051                 if (idx < 0)
2052                         idx = IEEE80211_FRAGMENT_MAX - 1;
2053
2054                 entry = &sdata->fragments[idx];
2055                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2056                     entry->rx_queue != rx_queue ||
2057                     entry->last_frag + 1 != frag)
2058                         continue;
2059
2060                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
2061
2062                 /*
2063                  * Check ftype and addresses are equal, else check next fragment
2064                  */
2065                 if (((hdr->frame_control ^ f_hdr->frame_control) &
2066                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
2067                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2068                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
2069                         continue;
2070
2071                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
2072                         __skb_queue_purge(&entry->skb_list);
2073                         continue;
2074                 }
2075                 return entry;
2076         }
2077
2078         return NULL;
2079 }
2080
2081 static ieee80211_rx_result debug_noinline
2082 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
2083 {
2084         struct ieee80211_hdr *hdr;
2085         u16 sc;
2086         __le16 fc;
2087         unsigned int frag, seq;
2088         struct ieee80211_fragment_entry *entry;
2089         struct sk_buff *skb;
2090
2091         hdr = (struct ieee80211_hdr *)rx->skb->data;
2092         fc = hdr->frame_control;
2093
2094         if (ieee80211_is_ctl(fc))
2095                 return RX_CONTINUE;
2096
2097         sc = le16_to_cpu(hdr->seq_ctrl);
2098         frag = sc & IEEE80211_SCTL_FRAG;
2099
2100         if (is_multicast_ether_addr(hdr->addr1)) {
2101                 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
2102                 goto out_no_led;
2103         }
2104
2105         if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2106                 goto out;
2107
2108         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2109
2110         if (skb_linearize(rx->skb))
2111                 return RX_DROP_UNUSABLE;
2112
2113         /*
2114          *  skb_linearize() might change the skb->data and
2115          *  previously cached variables (in this case, hdr) need to
2116          *  be refreshed with the new data.
2117          */
2118         hdr = (struct ieee80211_hdr *)rx->skb->data;
2119         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2120
2121         if (frag == 0) {
2122                 /* This is the first fragment of a new frame. */
2123                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
2124                                                  rx->seqno_idx, &(rx->skb));
2125                 if (rx->key &&
2126                     (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
2127                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2128                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2129                      rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
2130                     ieee80211_has_protected(fc)) {
2131                         int queue = rx->security_idx;
2132
2133                         /* Store CCMP/GCMP PN so that we can verify that the
2134                          * next fragment has a sequential PN value.
2135                          */
2136                         entry->check_sequential_pn = true;
2137                         memcpy(entry->last_pn,
2138                                rx->key->u.ccmp.rx_pn[queue],
2139                                IEEE80211_CCMP_PN_LEN);
2140                         BUILD_BUG_ON(offsetof(struct ieee80211_key,
2141                                               u.ccmp.rx_pn) !=
2142                                      offsetof(struct ieee80211_key,
2143                                               u.gcmp.rx_pn));
2144                         BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2145                                      sizeof(rx->key->u.gcmp.rx_pn[queue]));
2146                         BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2147                                      IEEE80211_GCMP_PN_LEN);
2148                 }
2149                 return RX_QUEUED;
2150         }
2151
2152         /* This is a fragment for a frame that should already be pending in
2153          * fragment cache. Add this fragment to the end of the pending entry.
2154          */
2155         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2156                                           rx->seqno_idx, hdr);
2157         if (!entry) {
2158                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2159                 return RX_DROP_MONITOR;
2160         }
2161
2162         /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2163          *  MPDU PN values are not incrementing in steps of 1."
2164          * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2165          * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2166          */
2167         if (entry->check_sequential_pn) {
2168                 int i;
2169                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2170                 int queue;
2171
2172                 if (!rx->key ||
2173                     (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2174                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2175                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2176                      rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2177                         return RX_DROP_UNUSABLE;
2178                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2179                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2180                         pn[i]++;
2181                         if (pn[i])
2182                                 break;
2183                 }
2184                 queue = rx->security_idx;
2185                 rpn = rx->key->u.ccmp.rx_pn[queue];
2186                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2187                         return RX_DROP_UNUSABLE;
2188                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2189         }
2190
2191         skb_pull(rx->skb, ieee80211_hdrlen(fc));
2192         __skb_queue_tail(&entry->skb_list, rx->skb);
2193         entry->last_frag = frag;
2194         entry->extra_len += rx->skb->len;
2195         if (ieee80211_has_morefrags(fc)) {
2196                 rx->skb = NULL;
2197                 return RX_QUEUED;
2198         }
2199
2200         rx->skb = __skb_dequeue(&entry->skb_list);
2201         if (skb_tailroom(rx->skb) < entry->extra_len) {
2202                 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2203                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2204                                               GFP_ATOMIC))) {
2205                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2206                         __skb_queue_purge(&entry->skb_list);
2207                         return RX_DROP_UNUSABLE;
2208                 }
2209         }
2210         while ((skb = __skb_dequeue(&entry->skb_list))) {
2211                 skb_put_data(rx->skb, skb->data, skb->len);
2212                 dev_kfree_skb(skb);
2213         }
2214
2215  out:
2216         ieee80211_led_rx(rx->local);
2217  out_no_led:
2218         if (rx->sta)
2219                 rx->sta->rx_stats.packets++;
2220         return RX_CONTINUE;
2221 }
2222
2223 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2224 {
2225         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2226                 return -EACCES;
2227
2228         return 0;
2229 }
2230
2231 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2232 {
2233         struct sk_buff *skb = rx->skb;
2234         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2235
2236         /*
2237          * Pass through unencrypted frames if the hardware has
2238          * decrypted them already.
2239          */
2240         if (status->flag & RX_FLAG_DECRYPTED)
2241                 return 0;
2242
2243         /* Drop unencrypted frames if key is set. */
2244         if (unlikely(!ieee80211_has_protected(fc) &&
2245                      !ieee80211_is_nullfunc(fc) &&
2246                      ieee80211_is_data(fc) && rx->key))
2247                 return -EACCES;
2248
2249         return 0;
2250 }
2251
2252 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2253 {
2254         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2255         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2256         __le16 fc = hdr->frame_control;
2257
2258         /*
2259          * Pass through unencrypted frames if the hardware has
2260          * decrypted them already.
2261          */
2262         if (status->flag & RX_FLAG_DECRYPTED)
2263                 return 0;
2264
2265         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2266                 if (unlikely(!ieee80211_has_protected(fc) &&
2267                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2268                              rx->key)) {
2269                         if (ieee80211_is_deauth(fc) ||
2270                             ieee80211_is_disassoc(fc))
2271                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2272                                                              rx->skb->data,
2273                                                              rx->skb->len);
2274                         return -EACCES;
2275                 }
2276                 /* BIP does not use Protected field, so need to check MMIE */
2277                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2278                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2279                         if (ieee80211_is_deauth(fc) ||
2280                             ieee80211_is_disassoc(fc))
2281                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2282                                                              rx->skb->data,
2283                                                              rx->skb->len);
2284                         return -EACCES;
2285                 }
2286                 /*
2287                  * When using MFP, Action frames are not allowed prior to
2288                  * having configured keys.
2289                  */
2290                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2291                              ieee80211_is_robust_mgmt_frame(rx->skb)))
2292                         return -EACCES;
2293         }
2294
2295         return 0;
2296 }
2297
2298 static int
2299 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2300 {
2301         struct ieee80211_sub_if_data *sdata = rx->sdata;
2302         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2303         bool check_port_control = false;
2304         struct ethhdr *ehdr;
2305         int ret;
2306
2307         *port_control = false;
2308         if (ieee80211_has_a4(hdr->frame_control) &&
2309             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2310                 return -1;
2311
2312         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2313             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2314
2315                 if (!sdata->u.mgd.use_4addr)
2316                         return -1;
2317                 else
2318                         check_port_control = true;
2319         }
2320
2321         if (is_multicast_ether_addr(hdr->addr1) &&
2322             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2323                 return -1;
2324
2325         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2326         if (ret < 0)
2327                 return ret;
2328
2329         ehdr = (struct ethhdr *) rx->skb->data;
2330         if (ehdr->h_proto == rx->sdata->control_port_protocol)
2331                 *port_control = true;
2332         else if (check_port_control)
2333                 return -1;
2334
2335         return 0;
2336 }
2337
2338 /*
2339  * requires that rx->skb is a frame with ethernet header
2340  */
2341 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2342 {
2343         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2344                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2345         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2346
2347         /*
2348          * Allow EAPOL frames to us/the PAE group address regardless
2349          * of whether the frame was encrypted or not.
2350          */
2351         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2352             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2353              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2354                 return true;
2355
2356         if (ieee80211_802_1x_port_control(rx) ||
2357             ieee80211_drop_unencrypted(rx, fc))
2358                 return false;
2359
2360         return true;
2361 }
2362
2363 static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2364                                                  struct ieee80211_rx_data *rx)
2365 {
2366         struct ieee80211_sub_if_data *sdata = rx->sdata;
2367         struct net_device *dev = sdata->dev;
2368
2369         if (unlikely((skb->protocol == sdata->control_port_protocol ||
2370                       skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2371                      sdata->control_port_over_nl80211)) {
2372                 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2373                 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
2374
2375                 cfg80211_rx_control_port(dev, skb, noencrypt);
2376                 dev_kfree_skb(skb);
2377         } else {
2378                 /* deliver to local stack */
2379                 if (rx->napi)
2380                         napi_gro_receive(rx->napi, skb);
2381                 else
2382                         netif_receive_skb(skb);
2383         }
2384 }
2385
2386 /*
2387  * requires that rx->skb is a frame with ethernet header
2388  */
2389 static void
2390 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2391 {
2392         struct ieee80211_sub_if_data *sdata = rx->sdata;
2393         struct net_device *dev = sdata->dev;
2394         struct sk_buff *skb, *xmit_skb;
2395         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2396         struct sta_info *dsta;
2397
2398         skb = rx->skb;
2399         xmit_skb = NULL;
2400
2401         ieee80211_rx_stats(dev, skb->len);
2402
2403         if (rx->sta) {
2404                 /* The seqno index has the same property as needed
2405                  * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2406                  * for non-QoS-data frames. Here we know it's a data
2407                  * frame, so count MSDUs.
2408                  */
2409                 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2410                 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2411                 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2412         }
2413
2414         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2415              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2416             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2417             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2418                 if (is_multicast_ether_addr(ehdr->h_dest) &&
2419                     ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2420                         /*
2421                          * send multicast frames both to higher layers in
2422                          * local net stack and back to the wireless medium
2423                          */
2424                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
2425                         if (!xmit_skb)
2426                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
2427                                                     dev->name);
2428                 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2429                         dsta = sta_info_get(sdata, skb->data);
2430                         if (dsta) {
2431                                 /*
2432                                  * The destination station is associated to
2433                                  * this AP (in this VLAN), so send the frame
2434                                  * directly to it and do not pass it to local
2435                                  * net stack.
2436                                  */
2437                                 xmit_skb = skb;
2438                                 skb = NULL;
2439                         }
2440                 }
2441         }
2442
2443 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2444         if (skb) {
2445                 /* 'align' will only take the values 0 or 2 here since all
2446                  * frames are required to be aligned to 2-byte boundaries
2447                  * when being passed to mac80211; the code here works just
2448                  * as well if that isn't true, but mac80211 assumes it can
2449                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2450                  */
2451                 int align;
2452
2453                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2454                 if (align) {
2455                         if (WARN_ON(skb_headroom(skb) < 3)) {
2456                                 dev_kfree_skb(skb);
2457                                 skb = NULL;
2458                         } else {
2459                                 u8 *data = skb->data;
2460                                 size_t len = skb_headlen(skb);
2461                                 skb->data -= align;
2462                                 memmove(skb->data, data, len);
2463                                 skb_set_tail_pointer(skb, len);
2464                         }
2465                 }
2466         }
2467 #endif
2468
2469         if (skb) {
2470                 skb->protocol = eth_type_trans(skb, dev);
2471                 memset(skb->cb, 0, sizeof(skb->cb));
2472
2473                 ieee80211_deliver_skb_to_local_stack(skb, rx);
2474         }
2475
2476         if (xmit_skb) {
2477                 /*
2478                  * Send to wireless media and increase priority by 256 to
2479                  * keep the received priority instead of reclassifying
2480                  * the frame (see cfg80211_classify8021d).
2481                  */
2482                 xmit_skb->priority += 256;
2483                 xmit_skb->protocol = htons(ETH_P_802_3);
2484                 skb_reset_network_header(xmit_skb);
2485                 skb_reset_mac_header(xmit_skb);
2486                 dev_queue_xmit(xmit_skb);
2487         }
2488 }
2489
2490 static ieee80211_rx_result debug_noinline
2491 __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
2492 {
2493         struct net_device *dev = rx->sdata->dev;
2494         struct sk_buff *skb = rx->skb;
2495         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2496         __le16 fc = hdr->frame_control;
2497         struct sk_buff_head frame_list;
2498         struct ethhdr ethhdr;
2499         const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2500
2501         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2502                 check_da = NULL;
2503                 check_sa = NULL;
2504         } else switch (rx->sdata->vif.type) {
2505                 case NL80211_IFTYPE_AP:
2506                 case NL80211_IFTYPE_AP_VLAN:
2507                         check_da = NULL;
2508                         break;
2509                 case NL80211_IFTYPE_STATION:
2510                         if (!rx->sta ||
2511                             !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2512                                 check_sa = NULL;
2513                         break;
2514                 case NL80211_IFTYPE_MESH_POINT:
2515                         check_sa = NULL;
2516                         break;
2517                 default:
2518                         break;
2519         }
2520
2521         skb->dev = dev;
2522         __skb_queue_head_init(&frame_list);
2523
2524         if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2525                                           rx->sdata->vif.addr,
2526                                           rx->sdata->vif.type,
2527                                           data_offset))
2528                 return RX_DROP_UNUSABLE;
2529
2530         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2531                                  rx->sdata->vif.type,
2532                                  rx->local->hw.extra_tx_headroom,
2533                                  check_da, check_sa);
2534
2535         while (!skb_queue_empty(&frame_list)) {
2536                 rx->skb = __skb_dequeue(&frame_list);
2537
2538                 if (!ieee80211_frame_allowed(rx, fc)) {
2539                         dev_kfree_skb(rx->skb);
2540                         continue;
2541                 }
2542
2543                 ieee80211_deliver_skb(rx);
2544         }
2545
2546         return RX_QUEUED;
2547 }
2548
2549 static ieee80211_rx_result debug_noinline
2550 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2551 {
2552         struct sk_buff *skb = rx->skb;
2553         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2554         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2555         __le16 fc = hdr->frame_control;
2556
2557         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2558                 return RX_CONTINUE;
2559
2560         if (unlikely(!ieee80211_is_data(fc)))
2561                 return RX_CONTINUE;
2562
2563         if (unlikely(!ieee80211_is_data_present(fc)))
2564                 return RX_DROP_MONITOR;
2565
2566         if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2567                 switch (rx->sdata->vif.type) {
2568                 case NL80211_IFTYPE_AP_VLAN:
2569                         if (!rx->sdata->u.vlan.sta)
2570                                 return RX_DROP_UNUSABLE;
2571                         break;
2572                 case NL80211_IFTYPE_STATION:
2573                         if (!rx->sdata->u.mgd.use_4addr)
2574                                 return RX_DROP_UNUSABLE;
2575                         break;
2576                 default:
2577                         return RX_DROP_UNUSABLE;
2578                 }
2579         }
2580
2581         if (is_multicast_ether_addr(hdr->addr1))
2582                 return RX_DROP_UNUSABLE;
2583
2584         return __ieee80211_rx_h_amsdu(rx, 0);
2585 }
2586
2587 #ifdef CONFIG_MAC80211_MESH
2588 static ieee80211_rx_result
2589 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2590 {
2591         struct ieee80211_hdr *fwd_hdr, *hdr;
2592         struct ieee80211_tx_info *info;
2593         struct ieee80211s_hdr *mesh_hdr;
2594         struct sk_buff *skb = rx->skb, *fwd_skb;
2595         struct ieee80211_local *local = rx->local;
2596         struct ieee80211_sub_if_data *sdata = rx->sdata;
2597         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2598         u16 ac, q, hdrlen;
2599
2600         hdr = (struct ieee80211_hdr *) skb->data;
2601         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2602
2603         /* make sure fixed part of mesh header is there, also checks skb len */
2604         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2605                 return RX_DROP_MONITOR;
2606
2607         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2608
2609         /* make sure full mesh header is there, also checks skb len */
2610         if (!pskb_may_pull(rx->skb,
2611                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2612                 return RX_DROP_MONITOR;
2613
2614         /* reload pointers */
2615         hdr = (struct ieee80211_hdr *) skb->data;
2616         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2617
2618         if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2619                 return RX_DROP_MONITOR;
2620
2621         /* frame is in RMC, don't forward */
2622         if (ieee80211_is_data(hdr->frame_control) &&
2623             is_multicast_ether_addr(hdr->addr1) &&
2624             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2625                 return RX_DROP_MONITOR;
2626
2627         if (!ieee80211_is_data(hdr->frame_control))
2628                 return RX_CONTINUE;
2629
2630         if (!mesh_hdr->ttl)
2631                 return RX_DROP_MONITOR;
2632
2633         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2634                 struct mesh_path *mppath;
2635                 char *proxied_addr;
2636                 char *mpp_addr;
2637
2638                 if (is_multicast_ether_addr(hdr->addr1)) {
2639                         mpp_addr = hdr->addr3;
2640                         proxied_addr = mesh_hdr->eaddr1;
2641                 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2642                             MESH_FLAGS_AE_A5_A6) {
2643                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2644                         mpp_addr = hdr->addr4;
2645                         proxied_addr = mesh_hdr->eaddr2;
2646                 } else {
2647                         return RX_DROP_MONITOR;
2648                 }
2649
2650                 rcu_read_lock();
2651                 mppath = mpp_path_lookup(sdata, proxied_addr);
2652                 if (!mppath) {
2653                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2654                 } else {
2655                         spin_lock_bh(&mppath->state_lock);
2656                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2657                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2658                         mppath->exp_time = jiffies;
2659                         spin_unlock_bh(&mppath->state_lock);
2660                 }
2661                 rcu_read_unlock();
2662         }
2663
2664         /* Frame has reached destination.  Don't forward */
2665         if (!is_multicast_ether_addr(hdr->addr1) &&
2666             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2667                 return RX_CONTINUE;
2668
2669         ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2670         q = sdata->vif.hw_queue[ac];
2671         if (ieee80211_queue_stopped(&local->hw, q)) {
2672                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2673                 return RX_DROP_MONITOR;
2674         }
2675         skb_set_queue_mapping(skb, q);
2676
2677         if (!--mesh_hdr->ttl) {
2678                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2679                 goto out;
2680         }
2681
2682         if (!ifmsh->mshcfg.dot11MeshForwarding)
2683                 goto out;
2684
2685         fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2686                                        sdata->encrypt_headroom, 0, GFP_ATOMIC);
2687         if (!fwd_skb)
2688                 goto out;
2689
2690         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2691         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2692         info = IEEE80211_SKB_CB(fwd_skb);
2693         memset(info, 0, sizeof(*info));
2694         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2695         info->control.vif = &rx->sdata->vif;
2696         info->control.jiffies = jiffies;
2697         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2698                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2699                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2700                 /* update power mode indication when forwarding */
2701                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2702         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2703                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2704                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2705         } else {
2706                 /* unable to resolve next hop */
2707                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2708                                    fwd_hdr->addr3, 0,
2709                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2710                                    fwd_hdr->addr2);
2711                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2712                 kfree_skb(fwd_skb);
2713                 return RX_DROP_MONITOR;
2714         }
2715
2716         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2717         ieee80211_add_pending_skb(local, fwd_skb);
2718  out:
2719         if (is_multicast_ether_addr(hdr->addr1))
2720                 return RX_CONTINUE;
2721         return RX_DROP_MONITOR;
2722 }
2723 #endif
2724
2725 static ieee80211_rx_result debug_noinline
2726 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2727 {
2728         struct ieee80211_sub_if_data *sdata = rx->sdata;
2729         struct ieee80211_local *local = rx->local;
2730         struct net_device *dev = sdata->dev;
2731         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2732         __le16 fc = hdr->frame_control;
2733         bool port_control;
2734         int err;
2735
2736         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2737                 return RX_CONTINUE;
2738
2739         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2740                 return RX_DROP_MONITOR;
2741
2742         /*
2743          * Send unexpected-4addr-frame event to hostapd. For older versions,
2744          * also drop the frame to cooked monitor interfaces.
2745          */
2746         if (ieee80211_has_a4(hdr->frame_control) &&
2747             sdata->vif.type == NL80211_IFTYPE_AP) {
2748                 if (rx->sta &&
2749                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2750                         cfg80211_rx_unexpected_4addr_frame(
2751                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2752                 return RX_DROP_MONITOR;
2753         }
2754
2755         err = __ieee80211_data_to_8023(rx, &port_control);
2756         if (unlikely(err))
2757                 return RX_DROP_UNUSABLE;
2758
2759         if (!ieee80211_frame_allowed(rx, fc))
2760                 return RX_DROP_MONITOR;
2761
2762         /* directly handle TDLS channel switch requests/responses */
2763         if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2764                                                 cpu_to_be16(ETH_P_TDLS))) {
2765                 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2766
2767                 if (pskb_may_pull(rx->skb,
2768                                   offsetof(struct ieee80211_tdls_data, u)) &&
2769                     tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2770                     tf->category == WLAN_CATEGORY_TDLS &&
2771                     (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2772                      tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2773                         skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2774                         schedule_work(&local->tdls_chsw_work);
2775                         if (rx->sta)
2776                                 rx->sta->rx_stats.packets++;
2777
2778                         return RX_QUEUED;
2779                 }
2780         }
2781
2782         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2783             unlikely(port_control) && sdata->bss) {
2784                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2785                                      u.ap);
2786                 dev = sdata->dev;
2787                 rx->sdata = sdata;
2788         }
2789
2790         rx->skb->dev = dev;
2791
2792         if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2793             local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2794             !is_multicast_ether_addr(
2795                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2796             (!local->scanning &&
2797              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2798                 mod_timer(&local->dynamic_ps_timer, jiffies +
2799                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2800
2801         ieee80211_deliver_skb(rx);
2802
2803         return RX_QUEUED;
2804 }
2805
2806 static ieee80211_rx_result debug_noinline
2807 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2808 {
2809         struct sk_buff *skb = rx->skb;
2810         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2811         struct tid_ampdu_rx *tid_agg_rx;
2812         u16 start_seq_num;
2813         u16 tid;
2814
2815         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2816                 return RX_CONTINUE;
2817
2818         if (ieee80211_is_back_req(bar->frame_control)) {
2819                 struct {
2820                         __le16 control, start_seq_num;
2821                 } __packed bar_data;
2822                 struct ieee80211_event event = {
2823                         .type = BAR_RX_EVENT,
2824                 };
2825
2826                 if (!rx->sta)
2827                         return RX_DROP_MONITOR;
2828
2829                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2830                                   &bar_data, sizeof(bar_data)))
2831                         return RX_DROP_MONITOR;
2832
2833                 tid = le16_to_cpu(bar_data.control) >> 12;
2834
2835                 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2836                     !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2837                         ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2838                                              WLAN_BACK_RECIPIENT,
2839                                              WLAN_REASON_QSTA_REQUIRE_SETUP);
2840
2841                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2842                 if (!tid_agg_rx)
2843                         return RX_DROP_MONITOR;
2844
2845                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2846                 event.u.ba.tid = tid;
2847                 event.u.ba.ssn = start_seq_num;
2848                 event.u.ba.sta = &rx->sta->sta;
2849
2850                 /* reset session timer */
2851                 if (tid_agg_rx->timeout)
2852                         mod_timer(&tid_agg_rx->session_timer,
2853                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2854
2855                 spin_lock(&tid_agg_rx->reorder_lock);
2856                 /* release stored frames up to start of BAR */
2857                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2858                                                  start_seq_num, frames);
2859                 spin_unlock(&tid_agg_rx->reorder_lock);
2860
2861                 drv_event_callback(rx->local, rx->sdata, &event);
2862
2863                 kfree_skb(skb);
2864                 return RX_QUEUED;
2865         }
2866
2867         /*
2868          * After this point, we only want management frames,
2869          * so we can drop all remaining control frames to
2870          * cooked monitor interfaces.
2871          */
2872         return RX_DROP_MONITOR;
2873 }
2874
2875 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2876                                            struct ieee80211_mgmt *mgmt,
2877                                            size_t len)
2878 {
2879         struct ieee80211_local *local = sdata->local;
2880         struct sk_buff *skb;
2881         struct ieee80211_mgmt *resp;
2882
2883         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2884                 /* Not to own unicast address */
2885                 return;
2886         }
2887
2888         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2889             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2890                 /* Not from the current AP or not associated yet. */
2891                 return;
2892         }
2893
2894         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2895                 /* Too short SA Query request frame */
2896                 return;
2897         }
2898
2899         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2900         if (skb == NULL)
2901                 return;
2902
2903         skb_reserve(skb, local->hw.extra_tx_headroom);
2904         resp = skb_put_zero(skb, 24);
2905         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2906         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2907         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2908         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2909                                           IEEE80211_STYPE_ACTION);
2910         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2911         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2912         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2913         memcpy(resp->u.action.u.sa_query.trans_id,
2914                mgmt->u.action.u.sa_query.trans_id,
2915                WLAN_SA_QUERY_TR_ID_LEN);
2916
2917         ieee80211_tx_skb(sdata, skb);
2918 }
2919
2920 static ieee80211_rx_result debug_noinline
2921 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2922 {
2923         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2924         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2925
2926         /*
2927          * From here on, look only at management frames.
2928          * Data and control frames are already handled,
2929          * and unknown (reserved) frames are useless.
2930          */
2931         if (rx->skb->len < 24)
2932                 return RX_DROP_MONITOR;
2933
2934         if (!ieee80211_is_mgmt(mgmt->frame_control))
2935                 return RX_DROP_MONITOR;
2936
2937         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2938             ieee80211_is_beacon(mgmt->frame_control) &&
2939             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2940                 int sig = 0;
2941
2942                 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
2943                     !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
2944                         sig = status->signal;
2945
2946                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2947                                             rx->skb->data, rx->skb->len,
2948                                             status->freq, sig);
2949                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2950         }
2951
2952         if (ieee80211_drop_unencrypted_mgmt(rx))
2953                 return RX_DROP_UNUSABLE;
2954
2955         return RX_CONTINUE;
2956 }
2957
2958 static ieee80211_rx_result debug_noinline
2959 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2960 {
2961         struct ieee80211_local *local = rx->local;
2962         struct ieee80211_sub_if_data *sdata = rx->sdata;
2963         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2964         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2965         int len = rx->skb->len;
2966
2967         if (!ieee80211_is_action(mgmt->frame_control))
2968                 return RX_CONTINUE;
2969
2970         /* drop too small frames */
2971         if (len < IEEE80211_MIN_ACTION_SIZE)
2972                 return RX_DROP_UNUSABLE;
2973
2974         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2975             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2976             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2977                 return RX_DROP_UNUSABLE;
2978
2979         switch (mgmt->u.action.category) {
2980         case WLAN_CATEGORY_HT:
2981                 /* reject HT action frames from stations not supporting HT */
2982                 if (!rx->sta->sta.ht_cap.ht_supported)
2983                         goto invalid;
2984
2985                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2986                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2987                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2988                     sdata->vif.type != NL80211_IFTYPE_AP &&
2989                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2990                         break;
2991
2992                 /* verify action & smps_control/chanwidth are present */
2993                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2994                         goto invalid;
2995
2996                 switch (mgmt->u.action.u.ht_smps.action) {
2997                 case WLAN_HT_ACTION_SMPS: {
2998                         struct ieee80211_supported_band *sband;
2999                         enum ieee80211_smps_mode smps_mode;
3000                         struct sta_opmode_info sta_opmode = {};
3001
3002                         /* convert to HT capability */
3003                         switch (mgmt->u.action.u.ht_smps.smps_control) {
3004                         case WLAN_HT_SMPS_CONTROL_DISABLED:
3005                                 smps_mode = IEEE80211_SMPS_OFF;
3006                                 break;
3007                         case WLAN_HT_SMPS_CONTROL_STATIC:
3008                                 smps_mode = IEEE80211_SMPS_STATIC;
3009                                 break;
3010                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
3011                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
3012                                 break;
3013                         default:
3014                                 goto invalid;
3015                         }
3016
3017                         /* if no change do nothing */
3018                         if (rx->sta->sta.smps_mode == smps_mode)
3019                                 goto handled;
3020                         rx->sta->sta.smps_mode = smps_mode;
3021                         sta_opmode.smps_mode =
3022                                 ieee80211_smps_mode_to_smps_mode(smps_mode);
3023                         sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
3024
3025                         sband = rx->local->hw.wiphy->bands[status->band];
3026
3027                         rate_control_rate_update(local, sband, rx->sta,
3028                                                  IEEE80211_RC_SMPS_CHANGED);
3029                         cfg80211_sta_opmode_change_notify(sdata->dev,
3030                                                           rx->sta->addr,
3031                                                           &sta_opmode,
3032                                                           GFP_KERNEL);
3033                         goto handled;
3034                 }
3035                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3036                         struct ieee80211_supported_band *sband;
3037                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
3038                         enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
3039                         struct sta_opmode_info sta_opmode = {};
3040
3041                         /* If it doesn't support 40 MHz it can't change ... */
3042                         if (!(rx->sta->sta.ht_cap.cap &
3043                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
3044                                 goto handled;
3045
3046                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
3047                                 max_bw = IEEE80211_STA_RX_BW_20;
3048                         else
3049                                 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3050
3051                         /* set cur_max_bandwidth and recalc sta bw */
3052                         rx->sta->cur_max_bandwidth = max_bw;
3053                         new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
3054
3055                         if (rx->sta->sta.bandwidth == new_bw)
3056                                 goto handled;
3057
3058                         rx->sta->sta.bandwidth = new_bw;
3059                         sband = rx->local->hw.wiphy->bands[status->band];
3060                         sta_opmode.bw =
3061                                 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
3062                         sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
3063
3064                         rate_control_rate_update(local, sband, rx->sta,
3065                                                  IEEE80211_RC_BW_CHANGED);
3066                         cfg80211_sta_opmode_change_notify(sdata->dev,
3067                                                           rx->sta->addr,
3068                                                           &sta_opmode,
3069                                                           GFP_KERNEL);
3070                         goto handled;
3071                 }
3072                 default:
3073                         goto invalid;
3074                 }
3075
3076                 break;
3077         case WLAN_CATEGORY_PUBLIC:
3078                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3079                         goto invalid;
3080                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3081                         break;
3082                 if (!rx->sta)
3083                         break;
3084                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3085                         break;
3086                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3087                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3088                         break;
3089                 if (len < offsetof(struct ieee80211_mgmt,
3090                                    u.action.u.ext_chan_switch.variable))
3091                         goto invalid;
3092                 goto queue;
3093         case WLAN_CATEGORY_VHT:
3094                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3095                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3096                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3097                     sdata->vif.type != NL80211_IFTYPE_AP &&
3098                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3099                         break;
3100
3101                 /* verify action code is present */
3102                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3103                         goto invalid;
3104
3105                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3106                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
3107                         /* verify opmode is present */
3108                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3109                                 goto invalid;
3110                         goto queue;
3111                 }
3112                 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3113                         if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3114                                 goto invalid;
3115                         goto queue;
3116                 }
3117                 default:
3118                         break;
3119                 }
3120                 break;
3121         case WLAN_CATEGORY_BACK:
3122                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3123                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3124                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3125                     sdata->vif.type != NL80211_IFTYPE_AP &&
3126                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
3127                         break;
3128
3129                 /* verify action_code is present */
3130                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3131                         break;
3132
3133                 switch (mgmt->u.action.u.addba_req.action_code) {
3134                 case WLAN_ACTION_ADDBA_REQ:
3135                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3136                                    sizeof(mgmt->u.action.u.addba_req)))
3137                                 goto invalid;
3138                         break;
3139                 case WLAN_ACTION_ADDBA_RESP:
3140                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3141                                    sizeof(mgmt->u.action.u.addba_resp)))
3142                                 goto invalid;
3143                         break;
3144                 case WLAN_ACTION_DELBA:
3145                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3146                                    sizeof(mgmt->u.action.u.delba)))
3147                                 goto invalid;
3148                         break;
3149                 default:
3150                         goto invalid;
3151                 }
3152
3153                 goto queue;
3154         case WLAN_CATEGORY_SPECTRUM_MGMT:
3155                 /* verify action_code is present */
3156                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3157                         break;
3158
3159                 switch (mgmt->u.action.u.measurement.action_code) {
3160                 case WLAN_ACTION_SPCT_MSR_REQ:
3161                         if (status->band != NL80211_BAND_5GHZ)
3162                                 break;
3163
3164                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3165                                    sizeof(mgmt->u.action.u.measurement)))
3166                                 break;
3167
3168                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3169                                 break;
3170
3171                         ieee80211_process_measurement_req(sdata, mgmt, len);
3172                         goto handled;
3173                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3174                         u8 *bssid;
3175                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3176                                    sizeof(mgmt->u.action.u.chan_switch)))
3177                                 break;
3178
3179                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3180                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3181                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3182                                 break;
3183
3184                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
3185                                 bssid = sdata->u.mgd.bssid;
3186                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3187                                 bssid = sdata->u.ibss.bssid;
3188                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3189                                 bssid = mgmt->sa;
3190                         else
3191                                 break;
3192
3193                         if (!ether_addr_equal(mgmt->bssid, bssid))
3194                                 break;
3195
3196                         goto queue;
3197                         }
3198                 }
3199                 break;
3200         case WLAN_CATEGORY_SA_QUERY:
3201                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3202                            sizeof(mgmt->u.action.u.sa_query)))
3203                         break;
3204
3205                 switch (mgmt->u.action.u.sa_query.action) {
3206                 case WLAN_ACTION_SA_QUERY_REQUEST:
3207                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
3208                                 break;
3209                         ieee80211_process_sa_query_req(sdata, mgmt, len);
3210                         goto handled;
3211                 }
3212                 break;
3213         case WLAN_CATEGORY_SELF_PROTECTED:
3214                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3215                            sizeof(mgmt->u.action.u.self_prot.action_code)))
3216                         break;
3217
3218                 switch (mgmt->u.action.u.self_prot.action_code) {
3219                 case WLAN_SP_MESH_PEERING_OPEN:
3220                 case WLAN_SP_MESH_PEERING_CLOSE:
3221                 case WLAN_SP_MESH_PEERING_CONFIRM:
3222                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3223                                 goto invalid;
3224                         if (sdata->u.mesh.user_mpm)
3225                                 /* userspace handles this frame */
3226                                 break;
3227                         goto queue;
3228                 case WLAN_SP_MGK_INFORM:
3229                 case WLAN_SP_MGK_ACK:
3230                         if (!ieee80211_vif_is_mesh(&sdata->vif))
3231                                 goto invalid;
3232                         break;
3233                 }
3234                 break;
3235         case WLAN_CATEGORY_MESH_ACTION:
3236                 if (len < (IEEE80211_MIN_ACTION_SIZE +
3237                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
3238                         break;
3239
3240                 if (!ieee80211_vif_is_mesh(&sdata->vif))
3241                         break;
3242                 if (mesh_action_is_path_sel(mgmt) &&
3243                     !mesh_path_sel_is_hwmp(sdata))
3244                         break;
3245                 goto queue;
3246         }
3247
3248         return RX_CONTINUE;
3249
3250  invalid:
3251         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3252         /* will return in the next handlers */
3253         return RX_CONTINUE;
3254
3255  handled:
3256         if (rx->sta)
3257                 rx->sta->rx_stats.packets++;
3258         dev_kfree_skb(rx->skb);
3259         return RX_QUEUED;
3260
3261  queue:
3262         skb_queue_tai