Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
[firefly-linux-kernel-4.4.55.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  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <linux/jiffies.h>
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rcupdate.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <net/ieee80211_radiotap.h>
22 #include <asm/unaligned.h>
23
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "led.h"
27 #include "mesh.h"
28 #include "wep.h"
29 #include "wpa.h"
30 #include "tkip.h"
31 #include "wme.h"
32 #include "rate.h"
33
34 /*
35  * monitor mode reception
36  *
37  * This function cleans up the SKB, i.e. it removes all the stuff
38  * only useful for monitoring.
39  */
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41                                            struct sk_buff *skb)
42 {
43         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44                 if (likely(skb->len > FCS_LEN))
45                         __pskb_trim(skb, skb->len - FCS_LEN);
46                 else {
47                         /* driver bug */
48                         WARN_ON(1);
49                         dev_kfree_skb(skb);
50                         return NULL;
51                 }
52         }
53
54         return skb;
55 }
56
57 static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
58 {
59         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
60         struct ieee80211_hdr *hdr;
61
62         hdr = (void *)(skb->data);
63
64         if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
65                             RX_FLAG_FAILED_PLCP_CRC |
66                             RX_FLAG_AMPDU_IS_ZEROLEN))
67                 return 1;
68         if (unlikely(skb->len < 16 + present_fcs_len))
69                 return 1;
70         if (ieee80211_is_ctl(hdr->frame_control) &&
71             !ieee80211_is_pspoll(hdr->frame_control) &&
72             !ieee80211_is_back_req(hdr->frame_control))
73                 return 1;
74         return 0;
75 }
76
77 static int
78 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
79                             struct ieee80211_rx_status *status)
80 {
81         int len;
82
83         /* always present fields */
84         len = sizeof(struct ieee80211_radiotap_header) + 8;
85
86         /* allocate extra bitmaps */
87         if (status->chains)
88                 len += 4 * hweight8(status->chains);
89
90         if (ieee80211_have_rx_timestamp(status)) {
91                 len = ALIGN(len, 8);
92                 len += 8;
93         }
94         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
95                 len += 1;
96
97         /* antenna field, if we don't have per-chain info */
98         if (!status->chains)
99                 len += 1;
100
101         /* padding for RX_FLAGS if necessary */
102         len = ALIGN(len, 2);
103
104         if (status->flag & RX_FLAG_HT) /* HT info */
105                 len += 3;
106
107         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
108                 len = ALIGN(len, 4);
109                 len += 8;
110         }
111
112         if (status->flag & RX_FLAG_VHT) {
113                 len = ALIGN(len, 2);
114                 len += 12;
115         }
116
117         if (status->chains) {
118                 /* antenna and antenna signal fields */
119                 len += 2 * hweight8(status->chains);
120         }
121
122         return len;
123 }
124
125 /*
126  * ieee80211_add_rx_radiotap_header - add radiotap header
127  *
128  * add a radiotap header containing all the fields which the hardware provided.
129  */
130 static void
131 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
132                                  struct sk_buff *skb,
133                                  struct ieee80211_rate *rate,
134                                  int rtap_len, bool has_fcs)
135 {
136         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
137         struct ieee80211_radiotap_header *rthdr;
138         unsigned char *pos;
139         __le32 *it_present;
140         u32 it_present_val;
141         u16 rx_flags = 0;
142         u16 channel_flags = 0;
143         int mpdulen, chain;
144         unsigned long chains = status->chains;
145
146         mpdulen = skb->len;
147         if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
148                 mpdulen += FCS_LEN;
149
150         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
151         memset(rthdr, 0, rtap_len);
152         it_present = &rthdr->it_present;
153
154         /* radiotap header, set always present flags */
155         rthdr->it_len = cpu_to_le16(rtap_len);
156         it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
157                          BIT(IEEE80211_RADIOTAP_CHANNEL) |
158                          BIT(IEEE80211_RADIOTAP_RX_FLAGS);
159
160         if (!status->chains)
161                 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
162
163         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
164                 it_present_val |=
165                         BIT(IEEE80211_RADIOTAP_EXT) |
166                         BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
167                 put_unaligned_le32(it_present_val, it_present);
168                 it_present++;
169                 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
170                                  BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
171         }
172
173         put_unaligned_le32(it_present_val, it_present);
174
175         pos = (void *)(it_present + 1);
176
177         /* the order of the following fields is important */
178
179         /* IEEE80211_RADIOTAP_TSFT */
180         if (ieee80211_have_rx_timestamp(status)) {
181                 /* padding */
182                 while ((pos - (u8 *)rthdr) & 7)
183                         *pos++ = 0;
184                 put_unaligned_le64(
185                         ieee80211_calculate_rx_timestamp(local, status,
186                                                          mpdulen, 0),
187                         pos);
188                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
189                 pos += 8;
190         }
191
192         /* IEEE80211_RADIOTAP_FLAGS */
193         if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
194                 *pos |= IEEE80211_RADIOTAP_F_FCS;
195         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
196                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
197         if (status->flag & RX_FLAG_SHORTPRE)
198                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
199         pos++;
200
201         /* IEEE80211_RADIOTAP_RATE */
202         if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
203                 /*
204                  * Without rate information don't add it. If we have,
205                  * MCS information is a separate field in radiotap,
206                  * added below. The byte here is needed as padding
207                  * for the channel though, so initialise it to 0.
208                  */
209                 *pos = 0;
210         } else {
211                 int shift = 0;
212                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
213                 if (status->flag & RX_FLAG_10MHZ)
214                         shift = 1;
215                 else if (status->flag & RX_FLAG_5MHZ)
216                         shift = 2;
217                 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
218         }
219         pos++;
220
221         /* IEEE80211_RADIOTAP_CHANNEL */
222         put_unaligned_le16(status->freq, pos);
223         pos += 2;
224         if (status->flag & RX_FLAG_10MHZ)
225                 channel_flags |= IEEE80211_CHAN_HALF;
226         else if (status->flag & RX_FLAG_5MHZ)
227                 channel_flags |= IEEE80211_CHAN_QUARTER;
228
229         if (status->band == IEEE80211_BAND_5GHZ)
230                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
231         else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
232                 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
233         else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
234                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
235         else if (rate)
236                 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
237         else
238                 channel_flags |= IEEE80211_CHAN_2GHZ;
239         put_unaligned_le16(channel_flags, pos);
240         pos += 2;
241
242         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
243         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
244             !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
245                 *pos = status->signal;
246                 rthdr->it_present |=
247                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
248                 pos++;
249         }
250
251         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
252
253         if (!status->chains) {
254                 /* IEEE80211_RADIOTAP_ANTENNA */
255                 *pos = status->antenna;
256                 pos++;
257         }
258
259         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
260
261         /* IEEE80211_RADIOTAP_RX_FLAGS */
262         /* ensure 2 byte alignment for the 2 byte field as required */
263         if ((pos - (u8 *)rthdr) & 1)
264                 *pos++ = 0;
265         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
266                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
267         put_unaligned_le16(rx_flags, pos);
268         pos += 2;
269
270         if (status->flag & RX_FLAG_HT) {
271                 unsigned int stbc;
272
273                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
274                 *pos++ = local->hw.radiotap_mcs_details;
275                 *pos = 0;
276                 if (status->flag & RX_FLAG_SHORT_GI)
277                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
278                 if (status->flag & RX_FLAG_40MHZ)
279                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
280                 if (status->flag & RX_FLAG_HT_GF)
281                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
282                 if (status->flag & RX_FLAG_LDPC)
283                         *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
284                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
285                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
286                 pos++;
287                 *pos++ = status->rate_idx;
288         }
289
290         if (status->flag & RX_FLAG_AMPDU_DETAILS) {
291                 u16 flags = 0;
292
293                 /* ensure 4 byte alignment */
294                 while ((pos - (u8 *)rthdr) & 3)
295                         pos++;
296                 rthdr->it_present |=
297                         cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
298                 put_unaligned_le32(status->ampdu_reference, pos);
299                 pos += 4;
300                 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
301                         flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
302                 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
303                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
304                 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
305                         flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
306                 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
307                         flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
308                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
309                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
310                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
311                         flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
312                 put_unaligned_le16(flags, pos);
313                 pos += 2;
314                 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
315                         *pos++ = status->ampdu_delimiter_crc;
316                 else
317                         *pos++ = 0;
318                 *pos++ = 0;
319         }
320
321         if (status->flag & RX_FLAG_VHT) {
322                 u16 known = local->hw.radiotap_vht_details;
323
324                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
325                 /* known field - how to handle 80+80? */
326                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
327                         known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
328                 put_unaligned_le16(known, pos);
329                 pos += 2;
330                 /* flags */
331                 if (status->flag & RX_FLAG_SHORT_GI)
332                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
333                 /* in VHT, STBC is binary */
334                 if (status->flag & RX_FLAG_STBC_MASK)
335                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
336                 pos++;
337                 /* bandwidth */
338                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
339                         *pos++ = 4;
340                 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
341                         *pos++ = 0; /* marked not known above */
342                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
343                         *pos++ = 11;
344                 else if (status->flag & RX_FLAG_40MHZ)
345                         *pos++ = 1;
346                 else /* 20 MHz */
347                         *pos++ = 0;
348                 /* MCS/NSS */
349                 *pos = (status->rate_idx << 4) | status->vht_nss;
350                 pos += 4;
351                 /* coding field */
352                 if (status->flag & RX_FLAG_LDPC)
353                         *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
354                 pos++;
355                 /* group ID */
356                 pos++;
357                 /* partial_aid */
358                 pos += 2;
359         }
360
361         for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
362                 *pos++ = status->chain_signal[chain];
363                 *pos++ = chain;
364         }
365 }
366
367 /*
368  * This function copies a received frame to all monitor interfaces and
369  * returns a cleaned-up SKB that no longer includes the FCS nor the
370  * radiotap header the driver might have added.
371  */
372 static struct sk_buff *
373 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
374                      struct ieee80211_rate *rate)
375 {
376         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
377         struct ieee80211_sub_if_data *sdata;
378         int needed_headroom;
379         struct sk_buff *skb, *skb2;
380         struct net_device *prev_dev = NULL;
381         int present_fcs_len = 0;
382
383         /*
384          * First, we may need to make a copy of the skb because
385          *  (1) we need to modify it for radiotap (if not present), and
386          *  (2) the other RX handlers will modify the skb we got.
387          *
388          * We don't need to, of course, if we aren't going to return
389          * the SKB because it has a bad FCS/PLCP checksum.
390          */
391
392         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
393                 present_fcs_len = FCS_LEN;
394
395         /* ensure hdr->frame_control is in skb head */
396         if (!pskb_may_pull(origskb, 2)) {
397                 dev_kfree_skb(origskb);
398                 return NULL;
399         }
400
401         if (!local->monitors) {
402                 if (should_drop_frame(origskb, present_fcs_len)) {
403                         dev_kfree_skb(origskb);
404                         return NULL;
405                 }
406
407                 return remove_monitor_info(local, origskb);
408         }
409
410         /* room for the radiotap header based on driver features */
411         needed_headroom = ieee80211_rx_radiotap_space(local, status);
412
413         if (should_drop_frame(origskb, present_fcs_len)) {
414                 /* only need to expand headroom if necessary */
415                 skb = origskb;
416                 origskb = NULL;
417
418                 /*
419                  * This shouldn't trigger often because most devices have an
420                  * RX header they pull before we get here, and that should
421                  * be big enough for our radiotap information. We should
422                  * probably export the length to drivers so that we can have
423                  * them allocate enough headroom to start with.
424                  */
425                 if (skb_headroom(skb) < needed_headroom &&
426                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
427                         dev_kfree_skb(skb);
428                         return NULL;
429                 }
430         } else {
431                 /*
432                  * Need to make a copy and possibly remove radiotap header
433                  * and FCS from the original.
434                  */
435                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
436
437                 origskb = remove_monitor_info(local, origskb);
438
439                 if (!skb)
440                         return origskb;
441         }
442
443         /* prepend radiotap information */
444         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
445                                          true);
446
447         skb_reset_mac_header(skb);
448         skb->ip_summed = CHECKSUM_UNNECESSARY;
449         skb->pkt_type = PACKET_OTHERHOST;
450         skb->protocol = htons(ETH_P_802_2);
451
452         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
453                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
454                         continue;
455
456                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
457                         continue;
458
459                 if (!ieee80211_sdata_running(sdata))
460                         continue;
461
462                 if (prev_dev) {
463                         skb2 = skb_clone(skb, GFP_ATOMIC);
464                         if (skb2) {
465                                 skb2->dev = prev_dev;
466                                 netif_receive_skb(skb2);
467                         }
468                 }
469
470                 prev_dev = sdata->dev;
471                 sdata->dev->stats.rx_packets++;
472                 sdata->dev->stats.rx_bytes += skb->len;
473         }
474
475         if (prev_dev) {
476                 skb->dev = prev_dev;
477                 netif_receive_skb(skb);
478         } else
479                 dev_kfree_skb(skb);
480
481         return origskb;
482 }
483
484 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
485 {
486         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
487         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
488         int tid, seqno_idx, security_idx;
489
490         /* does the frame have a qos control field? */
491         if (ieee80211_is_data_qos(hdr->frame_control)) {
492                 u8 *qc = ieee80211_get_qos_ctl(hdr);
493                 /* frame has qos control */
494                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
495                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
496                         status->rx_flags |= IEEE80211_RX_AMSDU;
497
498                 seqno_idx = tid;
499                 security_idx = tid;
500         } else {
501                 /*
502                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
503                  *
504                  *      Sequence numbers for management frames, QoS data
505                  *      frames with a broadcast/multicast address in the
506                  *      Address 1 field, and all non-QoS data frames sent
507                  *      by QoS STAs are assigned using an additional single
508                  *      modulo-4096 counter, [...]
509                  *
510                  * We also use that counter for non-QoS STAs.
511                  */
512                 seqno_idx = IEEE80211_NUM_TIDS;
513                 security_idx = 0;
514                 if (ieee80211_is_mgmt(hdr->frame_control))
515                         security_idx = IEEE80211_NUM_TIDS;
516                 tid = 0;
517         }
518
519         rx->seqno_idx = seqno_idx;
520         rx->security_idx = security_idx;
521         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
522          * For now, set skb->priority to 0 for other cases. */
523         rx->skb->priority = (tid > 7) ? 0 : tid;
524 }
525
526 /**
527  * DOC: Packet alignment
528  *
529  * Drivers always need to pass packets that are aligned to two-byte boundaries
530  * to the stack.
531  *
532  * Additionally, should, if possible, align the payload data in a way that
533  * guarantees that the contained IP header is aligned to a four-byte
534  * boundary. In the case of regular frames, this simply means aligning the
535  * payload to a four-byte boundary (because either the IP header is directly
536  * contained, or IV/RFC1042 headers that have a length divisible by four are
537  * in front of it).  If the payload data is not properly aligned and the
538  * architecture doesn't support efficient unaligned operations, mac80211
539  * will align the data.
540  *
541  * With A-MSDU frames, however, the payload data address must yield two modulo
542  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
543  * push the IP header further back to a multiple of four again. Thankfully, the
544  * specs were sane enough this time around to require padding each A-MSDU
545  * subframe to a length that is a multiple of four.
546  *
547  * Padding like Atheros hardware adds which is between the 802.11 header and
548  * the payload is not supported, the driver is required to move the 802.11
549  * header to be directly in front of the payload in that case.
550  */
551 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
552 {
553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
554         WARN_ONCE((unsigned long)rx->skb->data & 1,
555                   "unaligned packet at 0x%p\n", rx->skb->data);
556 #endif
557 }
558
559
560 /* rx handlers */
561
562 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
563 {
564         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
565
566         if (is_multicast_ether_addr(hdr->addr1))
567                 return 0;
568
569         return ieee80211_is_robust_mgmt_frame(skb);
570 }
571
572
573 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
574 {
575         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
576
577         if (!is_multicast_ether_addr(hdr->addr1))
578                 return 0;
579
580         return ieee80211_is_robust_mgmt_frame(skb);
581 }
582
583
584 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
585 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
586 {
587         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
588         struct ieee80211_mmie *mmie;
589
590         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
591                 return -1;
592
593         if (!ieee80211_is_robust_mgmt_frame(skb))
594                 return -1; /* not a robust management frame */
595
596         mmie = (struct ieee80211_mmie *)
597                 (skb->data + skb->len - sizeof(*mmie));
598         if (mmie->element_id != WLAN_EID_MMIE ||
599             mmie->length != sizeof(*mmie) - 2)
600                 return -1;
601
602         return le16_to_cpu(mmie->key_id);
603 }
604
605 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
606                                  struct sk_buff *skb)
607 {
608         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
609         __le16 fc;
610         int hdrlen;
611         u8 keyid;
612
613         fc = hdr->frame_control;
614         hdrlen = ieee80211_hdrlen(fc);
615
616         if (skb->len < hdrlen + cs->hdr_len)
617                 return -EINVAL;
618
619         skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
620         keyid &= cs->key_idx_mask;
621         keyid >>= cs->key_idx_shift;
622
623         return keyid;
624 }
625
626 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
627 {
628         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
629         char *dev_addr = rx->sdata->vif.addr;
630
631         if (ieee80211_is_data(hdr->frame_control)) {
632                 if (is_multicast_ether_addr(hdr->addr1)) {
633                         if (ieee80211_has_tods(hdr->frame_control) ||
634                             !ieee80211_has_fromds(hdr->frame_control))
635                                 return RX_DROP_MONITOR;
636                         if (ether_addr_equal(hdr->addr3, dev_addr))
637                                 return RX_DROP_MONITOR;
638                 } else {
639                         if (!ieee80211_has_a4(hdr->frame_control))
640                                 return RX_DROP_MONITOR;
641                         if (ether_addr_equal(hdr->addr4, dev_addr))
642                                 return RX_DROP_MONITOR;
643                 }
644         }
645
646         /* If there is not an established peer link and this is not a peer link
647          * establisment frame, beacon or probe, drop the frame.
648          */
649
650         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
651                 struct ieee80211_mgmt *mgmt;
652
653                 if (!ieee80211_is_mgmt(hdr->frame_control))
654                         return RX_DROP_MONITOR;
655
656                 if (ieee80211_is_action(hdr->frame_control)) {
657                         u8 category;
658
659                         /* make sure category field is present */
660                         if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
661                                 return RX_DROP_MONITOR;
662
663                         mgmt = (struct ieee80211_mgmt *)hdr;
664                         category = mgmt->u.action.category;
665                         if (category != WLAN_CATEGORY_MESH_ACTION &&
666                             category != WLAN_CATEGORY_SELF_PROTECTED)
667                                 return RX_DROP_MONITOR;
668                         return RX_CONTINUE;
669                 }
670
671                 if (ieee80211_is_probe_req(hdr->frame_control) ||
672                     ieee80211_is_probe_resp(hdr->frame_control) ||
673                     ieee80211_is_beacon(hdr->frame_control) ||
674                     ieee80211_is_auth(hdr->frame_control))
675                         return RX_CONTINUE;
676
677                 return RX_DROP_MONITOR;
678         }
679
680         return RX_CONTINUE;
681 }
682
683 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
684                                             struct tid_ampdu_rx *tid_agg_rx,
685                                             int index,
686                                             struct sk_buff_head *frames)
687 {
688         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
689         struct ieee80211_rx_status *status;
690
691         lockdep_assert_held(&tid_agg_rx->reorder_lock);
692
693         if (!skb)
694                 goto no_frame;
695
696         /* release the frame from the reorder ring buffer */
697         tid_agg_rx->stored_mpdu_num--;
698         tid_agg_rx->reorder_buf[index] = NULL;
699         status = IEEE80211_SKB_RXCB(skb);
700         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
701         __skb_queue_tail(frames, skb);
702
703 no_frame:
704         tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
705 }
706
707 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
708                                              struct tid_ampdu_rx *tid_agg_rx,
709                                              u16 head_seq_num,
710                                              struct sk_buff_head *frames)
711 {
712         int index;
713
714         lockdep_assert_held(&tid_agg_rx->reorder_lock);
715
716         while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
717                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
718                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
719                                                 frames);
720         }
721 }
722
723 /*
724  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
725  * the skb was added to the buffer longer than this time ago, the earlier
726  * frames that have not yet been received are assumed to be lost and the skb
727  * can be released for processing. This may also release other skb's from the
728  * reorder buffer if there are no additional gaps between the frames.
729  *
730  * Callers must hold tid_agg_rx->reorder_lock.
731  */
732 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
733
734 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
735                                           struct tid_ampdu_rx *tid_agg_rx,
736                                           struct sk_buff_head *frames)
737 {
738         int index, j;
739
740         lockdep_assert_held(&tid_agg_rx->reorder_lock);
741
742         /* release the buffer until next missing frame */
743         index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
744         if (!tid_agg_rx->reorder_buf[index] &&
745             tid_agg_rx->stored_mpdu_num) {
746                 /*
747                  * No buffers ready to be released, but check whether any
748                  * frames in the reorder buffer have timed out.
749                  */
750                 int skipped = 1;
751                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
752                      j = (j + 1) % tid_agg_rx->buf_size) {
753                         if (!tid_agg_rx->reorder_buf[j]) {
754                                 skipped++;
755                                 continue;
756                         }
757                         if (skipped &&
758                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
759                                         HT_RX_REORDER_BUF_TIMEOUT))
760                                 goto set_release_timer;
761
762                         ht_dbg_ratelimited(sdata,
763                                            "release an RX reorder frame due to timeout on earlier frames\n");
764                         ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
765                                                         frames);
766
767                         /*
768                          * Increment the head seq# also for the skipped slots.
769                          */
770                         tid_agg_rx->head_seq_num =
771                                 (tid_agg_rx->head_seq_num +
772                                  skipped) & IEEE80211_SN_MASK;
773                         skipped = 0;
774                 }
775         } else while (tid_agg_rx->reorder_buf[index]) {
776                 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
777                                                 frames);
778                 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
779         }
780
781         if (tid_agg_rx->stored_mpdu_num) {
782                 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
783
784                 for (; j != (index - 1) % tid_agg_rx->buf_size;
785                      j = (j + 1) % tid_agg_rx->buf_size) {
786                         if (tid_agg_rx->reorder_buf[j])
787                                 break;
788                 }
789
790  set_release_timer:
791
792                 mod_timer(&tid_agg_rx->reorder_timer,
793                           tid_agg_rx->reorder_time[j] + 1 +
794                           HT_RX_REORDER_BUF_TIMEOUT);
795         } else {
796                 del_timer(&tid_agg_rx->reorder_timer);
797         }
798 }
799
800 /*
801  * As this function belongs to the RX path it must be under
802  * rcu_read_lock protection. It returns false if the frame
803  * can be processed immediately, true if it was consumed.
804  */
805 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
806                                              struct tid_ampdu_rx *tid_agg_rx,
807                                              struct sk_buff *skb,
808                                              struct sk_buff_head *frames)
809 {
810         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
811         u16 sc = le16_to_cpu(hdr->seq_ctrl);
812         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
813         u16 head_seq_num, buf_size;
814         int index;
815         bool ret = true;
816
817         spin_lock(&tid_agg_rx->reorder_lock);
818
819         buf_size = tid_agg_rx->buf_size;
820         head_seq_num = tid_agg_rx->head_seq_num;
821
822         /* frame with out of date sequence number */
823         if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
824                 dev_kfree_skb(skb);
825                 goto out;
826         }
827
828         /*
829          * If frame the sequence number exceeds our buffering window
830          * size release some previous frames to make room for this one.
831          */
832         if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
833                 head_seq_num = ieee80211_sn_inc(
834                                 ieee80211_sn_sub(mpdu_seq_num, buf_size));
835                 /* release stored frames up to new head to stack */
836                 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
837                                                  head_seq_num, frames);
838         }
839
840         /* Now the new frame is always in the range of the reordering buffer */
841
842         index = mpdu_seq_num % tid_agg_rx->buf_size;
843
844         /* check if we already stored this frame */
845         if (tid_agg_rx->reorder_buf[index]) {
846                 dev_kfree_skb(skb);
847                 goto out;
848         }
849
850         /*
851          * If the current MPDU is in the right order and nothing else
852          * is stored we can process it directly, no need to buffer it.
853          * If it is first but there's something stored, we may be able
854          * to release frames after this one.
855          */
856         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
857             tid_agg_rx->stored_mpdu_num == 0) {
858                 tid_agg_rx->head_seq_num =
859                         ieee80211_sn_inc(tid_agg_rx->head_seq_num);
860                 ret = false;
861                 goto out;
862         }
863
864         /* put the frame in the reordering buffer */
865         tid_agg_rx->reorder_buf[index] = skb;
866         tid_agg_rx->reorder_time[index] = jiffies;
867         tid_agg_rx->stored_mpdu_num++;
868         ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
869
870  out:
871         spin_unlock(&tid_agg_rx->reorder_lock);
872         return ret;
873 }
874
875 /*
876  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
877  * true if the MPDU was buffered, false if it should be processed.
878  */
879 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
880                                        struct sk_buff_head *frames)
881 {
882         struct sk_buff *skb = rx->skb;
883         struct ieee80211_local *local = rx->local;
884         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
885         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
886         struct sta_info *sta = rx->sta;
887         struct tid_ampdu_rx *tid_agg_rx;
888         u16 sc;
889         u8 tid, ack_policy;
890
891         if (!ieee80211_is_data_qos(hdr->frame_control) ||
892             is_multicast_ether_addr(hdr->addr1))
893                 goto dont_reorder;
894
895         /*
896          * filter the QoS data rx stream according to
897          * STA/TID and check if this STA/TID is on aggregation
898          */
899
900         if (!sta)
901                 goto dont_reorder;
902
903         ack_policy = *ieee80211_get_qos_ctl(hdr) &
904                      IEEE80211_QOS_CTL_ACK_POLICY_MASK;
905         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
906
907         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
908         if (!tid_agg_rx)
909                 goto dont_reorder;
910
911         /* qos null data frames are excluded */
912         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
913                 goto dont_reorder;
914
915         /* not part of a BA session */
916         if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
917             ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
918                 goto dont_reorder;
919
920         /* not actually part of this BA session */
921         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
922                 goto dont_reorder;
923
924         /* new, potentially un-ordered, ampdu frame - process it */
925
926         /* reset session timer */
927         if (tid_agg_rx->timeout)
928                 tid_agg_rx->last_rx = jiffies;
929
930         /* if this mpdu is fragmented - terminate rx aggregation session */
931         sc = le16_to_cpu(hdr->seq_ctrl);
932         if (sc & IEEE80211_SCTL_FRAG) {
933                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
934                 skb_queue_tail(&rx->sdata->skb_queue, skb);
935                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
936                 return;
937         }
938
939         /*
940          * No locking needed -- we will only ever process one
941          * RX packet at a time, and thus own tid_agg_rx. All
942          * other code manipulating it needs to (and does) make
943          * sure that we cannot get to it any more before doing
944          * anything with it.
945          */
946         if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
947                                              frames))
948                 return;
949
950  dont_reorder:
951         __skb_queue_tail(frames, skb);
952 }
953
954 static ieee80211_rx_result debug_noinline
955 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
956 {
957         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
958         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
959
960         /*
961          * Drop duplicate 802.11 retransmissions
962          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
963          */
964         if (rx->skb->len >= 24 && rx->sta &&
965             !ieee80211_is_ctl(hdr->frame_control) &&
966             !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
967             !is_multicast_ether_addr(hdr->addr1)) {
968                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
969                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
970                              hdr->seq_ctrl)) {
971                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
972                                 rx->local->dot11FrameDuplicateCount++;
973                                 rx->sta->num_duplicates++;
974                         }
975                         return RX_DROP_UNUSABLE;
976                 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
977                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
978                 }
979         }
980
981         if (unlikely(rx->skb->len < 16)) {
982                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
983                 return RX_DROP_MONITOR;
984         }
985
986         /* Drop disallowed frame classes based on STA auth/assoc state;
987          * IEEE 802.11, Chap 5.5.
988          *
989          * mac80211 filters only based on association state, i.e. it drops
990          * Class 3 frames from not associated stations. hostapd sends
991          * deauth/disassoc frames when needed. In addition, hostapd is
992          * responsible for filtering on both auth and assoc states.
993          */
994
995         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
996                 return ieee80211_rx_mesh_check(rx);
997
998         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
999                       ieee80211_is_pspoll(hdr->frame_control)) &&
1000                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1001                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1002                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1003                 /*
1004                  * accept port control frames from the AP even when it's not
1005                  * yet marked ASSOC to prevent a race where we don't set the
1006                  * assoc bit quickly enough before it sends the first frame
1007                  */
1008                 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1009                     ieee80211_is_data_present(hdr->frame_control)) {
1010                         unsigned int hdrlen;
1011                         __be16 ethertype;
1012
1013                         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1014
1015                         if (rx->skb->len < hdrlen + 8)
1016                                 return RX_DROP_MONITOR;
1017
1018                         skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1019                         if (ethertype == rx->sdata->control_port_protocol)
1020                                 return RX_CONTINUE;
1021                 }
1022
1023                 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1024                     cfg80211_rx_spurious_frame(rx->sdata->dev,
1025                                                hdr->addr2,
1026                                                GFP_ATOMIC))
1027                         return RX_DROP_UNUSABLE;
1028
1029                 return RX_DROP_MONITOR;
1030         }
1031
1032         return RX_CONTINUE;
1033 }
1034
1035
1036 static ieee80211_rx_result debug_noinline
1037 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1038 {
1039         struct ieee80211_local *local;
1040         struct ieee80211_hdr *hdr;
1041         struct sk_buff *skb;
1042
1043         local = rx->local;
1044         skb = rx->skb;
1045         hdr = (struct ieee80211_hdr *) skb->data;
1046
1047         if (!local->pspolling)
1048                 return RX_CONTINUE;
1049
1050         if (!ieee80211_has_fromds(hdr->frame_control))
1051                 /* this is not from AP */
1052                 return RX_CONTINUE;
1053
1054         if (!ieee80211_is_data(hdr->frame_control))
1055                 return RX_CONTINUE;
1056
1057         if (!ieee80211_has_moredata(hdr->frame_control)) {
1058                 /* AP has no more frames buffered for us */
1059                 local->pspolling = false;
1060                 return RX_CONTINUE;
1061         }
1062
1063         /* more data bit is set, let's request a new frame from the AP */
1064         ieee80211_send_pspoll(local, rx->sdata);
1065
1066         return RX_CONTINUE;
1067 }
1068
1069 static void sta_ps_start(struct sta_info *sta)
1070 {
1071         struct ieee80211_sub_if_data *sdata = sta->sdata;
1072         struct ieee80211_local *local = sdata->local;
1073         struct ps_data *ps;
1074
1075         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1076             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1077                 ps = &sdata->bss->ps;
1078         else
1079                 return;
1080
1081         atomic_inc(&ps->num_sta_ps);
1082         set_sta_flag(sta, WLAN_STA_PS_STA);
1083         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1084                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1085         ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1086                sta->sta.addr, sta->sta.aid);
1087 }
1088
1089 static void sta_ps_end(struct sta_info *sta)
1090 {
1091         ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1092                sta->sta.addr, sta->sta.aid);
1093
1094         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1095                 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1096                        sta->sta.addr, sta->sta.aid);
1097                 return;
1098         }
1099
1100         ieee80211_sta_ps_deliver_wakeup(sta);
1101 }
1102
1103 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1104 {
1105         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1106         bool in_ps;
1107
1108         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1109
1110         /* Don't let the same PS state be set twice */
1111         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1112         if ((start && in_ps) || (!start && !in_ps))
1113                 return -EINVAL;
1114
1115         if (start)
1116                 sta_ps_start(sta_inf);
1117         else
1118                 sta_ps_end(sta_inf);
1119
1120         return 0;
1121 }
1122 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1123
1124 static ieee80211_rx_result debug_noinline
1125 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1126 {
1127         struct ieee80211_sub_if_data *sdata = rx->sdata;
1128         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1129         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1130         int tid, ac;
1131
1132         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1133                 return RX_CONTINUE;
1134
1135         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1136             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1137                 return RX_CONTINUE;
1138
1139         /*
1140          * The device handles station powersave, so don't do anything about
1141          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1142          * it to mac80211 since they're handled.)
1143          */
1144         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1145                 return RX_CONTINUE;
1146
1147         /*
1148          * Don't do anything if the station isn't already asleep. In
1149          * the uAPSD case, the station will probably be marked asleep,
1150          * in the PS-Poll case the station must be confused ...
1151          */
1152         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1153                 return RX_CONTINUE;
1154
1155         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1156                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1157                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1158                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1159                         else
1160                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1161                 }
1162
1163                 /* Free PS Poll skb here instead of returning RX_DROP that would
1164                  * count as an dropped frame. */
1165                 dev_kfree_skb(rx->skb);
1166
1167                 return RX_QUEUED;
1168         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1169                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1170                    ieee80211_has_pm(hdr->frame_control) &&
1171                    (ieee80211_is_data_qos(hdr->frame_control) ||
1172                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1173                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1174                 ac = ieee802_1d_to_ac[tid & 7];
1175
1176                 /*
1177                  * If this AC is not trigger-enabled do nothing.
1178                  *
1179                  * NB: This could/should check a separate bitmap of trigger-
1180                  * enabled queues, but for now we only implement uAPSD w/o
1181                  * TSPEC changes to the ACs, so they're always the same.
1182                  */
1183                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1184                         return RX_CONTINUE;
1185
1186                 /* if we are in a service period, do nothing */
1187                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1188                         return RX_CONTINUE;
1189
1190                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1191                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1192                 else
1193                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1194         }
1195
1196         return RX_CONTINUE;
1197 }
1198
1199 static ieee80211_rx_result debug_noinline
1200 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1201 {
1202         struct sta_info *sta = rx->sta;
1203         struct sk_buff *skb = rx->skb;
1204         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1205         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1206         int i;
1207
1208         if (!sta)
1209                 return RX_CONTINUE;
1210
1211         /*
1212          * Update last_rx only for IBSS packets which are for the current
1213          * BSSID and for station already AUTHORIZED to avoid keeping the
1214          * current IBSS network alive in cases where other STAs start
1215          * using different BSSID. This will also give the station another
1216          * chance to restart the authentication/authorization in case
1217          * something went wrong the first time.
1218          */
1219         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1220                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1221                                                 NL80211_IFTYPE_ADHOC);
1222                 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1223                     test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1224                         sta->last_rx = jiffies;
1225                         if (ieee80211_is_data(hdr->frame_control)) {
1226                                 sta->last_rx_rate_idx = status->rate_idx;
1227                                 sta->last_rx_rate_flag = status->flag;
1228                                 sta->last_rx_rate_vht_flag = status->vht_flag;
1229                                 sta->last_rx_rate_vht_nss = status->vht_nss;
1230                         }
1231                 }
1232         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1233                 /*
1234                  * Mesh beacons will update last_rx when if they are found to
1235                  * match the current local configuration when processed.
1236                  */
1237                 sta->last_rx = jiffies;
1238                 if (ieee80211_is_data(hdr->frame_control)) {
1239                         sta->last_rx_rate_idx = status->rate_idx;
1240                         sta->last_rx_rate_flag = status->flag;
1241                         sta->last_rx_rate_vht_nss = status->vht_nss;
1242                 }
1243         }
1244
1245         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1246                 return RX_CONTINUE;
1247
1248         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1249                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1250
1251         sta->rx_fragments++;
1252         sta->rx_bytes += rx->skb->len;
1253         if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1254                 sta->last_signal = status->signal;
1255                 ewma_add(&sta->avg_signal, -status->signal);
1256         }
1257
1258         if (status->chains) {
1259                 sta->chains = status->chains;
1260                 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1261                         int signal = status->chain_signal[i];
1262
1263                         if (!(status->chains & BIT(i)))
1264                                 continue;
1265
1266                         sta->chain_signal_last[i] = signal;
1267                         ewma_add(&sta->chain_signal_avg[i], -signal);
1268                 }
1269         }
1270
1271         /*
1272          * Change STA power saving mode only at the end of a frame
1273          * exchange sequence.
1274          */
1275         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1276             !ieee80211_has_morefrags(hdr->frame_control) &&
1277             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1278             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1279              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1280             /* PM bit is only checked in frames where it isn't reserved,
1281              * in AP mode it's reserved in non-bufferable management frames
1282              * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1283              */
1284             (!ieee80211_is_mgmt(hdr->frame_control) ||
1285              ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1286                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1287                         if (!ieee80211_has_pm(hdr->frame_control))
1288                                 sta_ps_end(sta);
1289                 } else {
1290                         if (ieee80211_has_pm(hdr->frame_control))
1291                                 sta_ps_start(sta);
1292                 }
1293         }
1294
1295         /* mesh power save support */
1296         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1297                 ieee80211_mps_rx_h_sta_process(sta, hdr);
1298
1299         /*
1300          * Drop (qos-)data::nullfunc frames silently, since they
1301          * are used only to control station power saving mode.
1302          */
1303         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1304             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1305                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1306
1307                 /*
1308                  * If we receive a 4-addr nullfunc frame from a STA
1309                  * that was not moved to a 4-addr STA vlan yet send
1310                  * the event to userspace and for older hostapd drop
1311                  * the frame to the monitor interface.
1312                  */
1313                 if (ieee80211_has_a4(hdr->frame_control) &&
1314                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1315                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1316                       !rx->sdata->u.vlan.sta))) {
1317                         if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1318                                 cfg80211_rx_unexpected_4addr_frame(
1319                                         rx->sdata->dev, sta->sta.addr,
1320                                         GFP_ATOMIC);
1321                         return RX_DROP_MONITOR;
1322                 }
1323                 /*
1324                  * Update counter and free packet here to avoid
1325                  * counting this as a dropped packed.
1326                  */
1327                 sta->rx_packets++;
1328                 dev_kfree_skb(rx->skb);
1329                 return RX_QUEUED;
1330         }
1331
1332         return RX_CONTINUE;
1333 } /* ieee80211_rx_h_sta_process */
1334
1335 static ieee80211_rx_result debug_noinline
1336 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1337 {
1338         struct sk_buff *skb = rx->skb;
1339         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1340         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1341         int keyidx;
1342         int hdrlen;
1343         ieee80211_rx_result result = RX_DROP_UNUSABLE;
1344         struct ieee80211_key *sta_ptk = NULL;
1345         int mmie_keyidx = -1;
1346         __le16 fc;
1347         const struct ieee80211_cipher_scheme *cs = NULL;
1348
1349         /*
1350          * Key selection 101
1351          *
1352          * There are four types of keys:
1353          *  - GTK (group keys)
1354          *  - IGTK (group keys for management frames)
1355          *  - PTK (pairwise keys)
1356          *  - STK (station-to-station pairwise keys)
1357          *
1358          * When selecting a key, we have to distinguish between multicast
1359          * (including broadcast) and unicast frames, the latter can only
1360          * use PTKs and STKs while the former always use GTKs and IGTKs.
1361          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1362          * unicast frames can also use key indices like GTKs. Hence, if we
1363          * don't have a PTK/STK we check the key index for a WEP key.
1364          *
1365          * Note that in a regular BSS, multicast frames are sent by the
1366          * AP only, associated stations unicast the frame to the AP first
1367          * which then multicasts it on their behalf.
1368          *
1369          * There is also a slight problem in IBSS mode: GTKs are negotiated
1370          * with each station, that is something we don't currently handle.
1371          * The spec seems to expect that one negotiates the same key with
1372          * every station but there's no such requirement; VLANs could be
1373          * possible.
1374          */
1375
1376         /*
1377          * No point in finding a key and decrypting if the frame is neither
1378          * addressed to us nor a multicast frame.
1379          */
1380         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1381                 return RX_CONTINUE;
1382
1383         /* start without a key */
1384         rx->key = NULL;
1385         fc = hdr->frame_control;
1386
1387         if (rx->sta) {
1388                 int keyid = rx->sta->ptk_idx;
1389
1390                 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1391                         cs = rx->sta->cipher_scheme;
1392                         keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1393                         if (unlikely(keyid < 0))
1394                                 return RX_DROP_UNUSABLE;
1395                 }
1396                 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1397         }
1398
1399         if (!ieee80211_has_protected(fc))
1400                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1401
1402         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1403                 rx->key = sta_ptk;
1404                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1405                     (status->flag & RX_FLAG_IV_STRIPPED))
1406                         return RX_CONTINUE;
1407                 /* Skip decryption if the frame is not protected. */
1408                 if (!ieee80211_has_protected(fc))
1409                         return RX_CONTINUE;
1410         } else if (mmie_keyidx >= 0) {
1411                 /* Broadcast/multicast robust management frame / BIP */
1412                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1413                     (status->flag & RX_FLAG_IV_STRIPPED))
1414                         return RX_CONTINUE;
1415
1416                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1417                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1418                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1419                 if (rx->sta)
1420                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1421                 if (!rx->key)
1422                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1423         } else if (!ieee80211_has_protected(fc)) {
1424                 /*
1425                  * The frame was not protected, so skip decryption. However, we
1426                  * need to set rx->key if there is a key that could have been
1427                  * used so that the frame may be dropped if encryption would
1428                  * have been expected.
1429                  */
1430                 struct ieee80211_key *key = NULL;
1431                 struct ieee80211_sub_if_data *sdata = rx->sdata;
1432                 int i;
1433
1434                 if (ieee80211_is_mgmt(fc) &&
1435                     is_multicast_ether_addr(hdr->addr1) &&
1436                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1437                         rx->key = key;
1438                 else {
1439                         if (rx->sta) {
1440                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1441                                         key = rcu_dereference(rx->sta->gtk[i]);
1442                                         if (key)
1443                                                 break;
1444                                 }
1445                         }
1446                         if (!key) {
1447                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1448                                         key = rcu_dereference(sdata->keys[i]);
1449                                         if (key)
1450                                                 break;
1451                                 }
1452                         }
1453                         if (key)
1454                                 rx->key = key;
1455                 }
1456                 return RX_CONTINUE;
1457         } else {
1458                 u8 keyid;
1459
1460                 /*
1461                  * The device doesn't give us the IV so we won't be
1462                  * able to look up the key. That's ok though, we
1463                  * don't need to decrypt the frame, we just won't
1464                  * be able to keep statistics accurate.
1465                  * Except for key threshold notifications, should
1466                  * we somehow allow the driver to tell us which key
1467                  * the hardware used if this flag is set?
1468                  */
1469                 if ((status->flag & RX_FLAG_DECRYPTED) &&
1470                     (status->flag & RX_FLAG_IV_STRIPPED))
1471                         return RX_CONTINUE;
1472
1473                 hdrlen = ieee80211_hdrlen(fc);
1474
1475                 if (cs) {
1476                         keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1477
1478                         if (unlikely(keyidx < 0))
1479                                 return RX_DROP_UNUSABLE;
1480                 } else {
1481                         if (rx->skb->len < 8 + hdrlen)
1482                                 return RX_DROP_UNUSABLE; /* TODO: count this? */
1483                         /*
1484                          * no need to call ieee80211_wep_get_keyidx,
1485                          * it verifies a bunch of things we've done already
1486                          */
1487                         skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1488                         keyidx = keyid >> 6;
1489                 }
1490
1491                 /* check per-station GTK first, if multicast packet */
1492                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1493                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1494
1495                 /* if not found, try default key */
1496                 if (!rx->key) {
1497                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1498
1499                         /*
1500                          * RSNA-protected unicast frames should always be
1501                          * sent with pairwise or station-to-station keys,
1502                          * but for WEP we allow using a key index as well.
1503                          */
1504                         if (rx->key &&
1505                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1506                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1507                             !is_multicast_ether_addr(hdr->addr1))
1508                                 rx->key = NULL;
1509                 }
1510         }
1511
1512         if (rx->key) {
1513                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1514                         return RX_DROP_MONITOR;
1515
1516                 rx->key->tx_rx_count++;
1517                 /* TODO: add threshold stuff again */
1518         } else {
1519                 return RX_DROP_MONITOR;
1520         }
1521
1522         switch (rx->key->conf.cipher) {
1523         case WLAN_CIPHER_SUITE_WEP40:
1524         case WLAN_CIPHER_SUITE_WEP104:
1525                 result = ieee80211_crypto_wep_decrypt(rx);
1526                 break;
1527         case WLAN_CIPHER_SUITE_TKIP:
1528                 result = ieee80211_crypto_tkip_decrypt(rx);
1529                 break;
1530         case WLAN_CIPHER_SUITE_CCMP:
1531                 result = ieee80211_crypto_ccmp_decrypt(rx);
1532                 break;
1533         case WLAN_CIPHER_SUITE_AES_CMAC:
1534                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1535                 break;
1536         default:
1537                 result = ieee80211_crypto_hw_decrypt(rx);
1538         }
1539
1540         /* the hdr variable is invalid after the decrypt handlers */
1541
1542         /* either the frame has been decrypted or will be dropped */
1543         status->flag |= RX_FLAG_DECRYPTED;
1544
1545         return result;
1546 }
1547
1548 static inline struct ieee80211_fragment_entry *
1549 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1550                          unsigned int frag, unsigned int seq, int rx_queue,
1551                          struct sk_buff **skb)
1552 {
1553         struct ieee80211_fragment_entry *entry;
1554
1555         entry = &sdata->fragments[sdata->fragment_next++];
1556         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1557                 sdata->fragment_next = 0;
1558
1559         if (!skb_queue_empty(&entry->skb_list))
1560                 __skb_queue_purge(&entry->skb_list);
1561
1562         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1563         *skb = NULL;
1564         entry->first_frag_time = jiffies;
1565         entry->seq = seq;
1566         entry->rx_queue = rx_queue;
1567         entry->last_frag = frag;
1568         entry->ccmp = 0;
1569         entry->extra_len = 0;
1570
1571         return entry;
1572 }
1573
1574 static inline struct ieee80211_fragment_entry *
1575 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1576                           unsigned int frag, unsigned int seq,
1577                           int rx_queue, struct ieee80211_hdr *hdr)
1578 {
1579         struct ieee80211_fragment_entry *entry;
1580         int i, idx;
1581
1582         idx = sdata->fragment_next;
1583         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1584                 struct ieee80211_hdr *f_hdr;
1585
1586                 idx--;
1587                 if (idx < 0)
1588                         idx = IEEE80211_FRAGMENT_MAX - 1;
1589
1590                 entry = &sdata->fragments[idx];
1591                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1592                     entry->rx_queue != rx_queue ||
1593                     entry->last_frag + 1 != frag)
1594                         continue;
1595
1596                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1597
1598                 /*
1599                  * Check ftype and addresses are equal, else check next fragment
1600                  */
1601                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1602                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1603                     !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1604                     !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1605                         continue;
1606
1607                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1608                         __skb_queue_purge(&entry->skb_list);
1609                         continue;
1610                 }
1611                 return entry;
1612         }
1613
1614         return NULL;
1615 }
1616
1617 static ieee80211_rx_result debug_noinline
1618 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1619 {
1620         struct ieee80211_hdr *hdr;
1621         u16 sc;
1622         __le16 fc;
1623         unsigned int frag, seq;
1624         struct ieee80211_fragment_entry *entry;
1625         struct sk_buff *skb;
1626         struct ieee80211_rx_status *status;
1627
1628         hdr = (struct ieee80211_hdr *)rx->skb->data;
1629         fc = hdr->frame_control;
1630
1631         if (ieee80211_is_ctl(fc))
1632                 return RX_CONTINUE;
1633
1634         sc = le16_to_cpu(hdr->seq_ctrl);
1635         frag = sc & IEEE80211_SCTL_FRAG;
1636
1637         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1638                    is_multicast_ether_addr(hdr->addr1))) {
1639                 /* not fragmented */
1640                 goto out;
1641         }
1642         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1643
1644         if (skb_linearize(rx->skb))
1645                 return RX_DROP_UNUSABLE;
1646
1647         /*
1648          *  skb_linearize() might change the skb->data and
1649          *  previously cached variables (in this case, hdr) need to
1650          *  be refreshed with the new data.
1651          */
1652         hdr = (struct ieee80211_hdr *)rx->skb->data;
1653         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1654
1655         if (frag == 0) {
1656                 /* This is the first fragment of a new frame. */
1657                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1658                                                  rx->seqno_idx, &(rx->skb));
1659                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1660                     ieee80211_has_protected(fc)) {
1661                         int queue = rx->security_idx;
1662                         /* Store CCMP PN so that we can verify that the next
1663                          * fragment has a sequential PN value. */
1664                         entry->ccmp = 1;
1665                         memcpy(entry->last_pn,
1666                                rx->key->u.ccmp.rx_pn[queue],
1667                                IEEE80211_CCMP_PN_LEN);
1668                 }
1669                 return RX_QUEUED;
1670         }
1671
1672         /* This is a fragment for a frame that should already be pending in
1673          * fragment cache. Add this fragment to the end of the pending entry.
1674          */
1675         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1676                                           rx->seqno_idx, hdr);
1677         if (!entry) {
1678                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1679                 return RX_DROP_MONITOR;
1680         }
1681
1682         /* Verify that MPDUs within one MSDU have sequential PN values.
1683          * (IEEE 802.11i, 8.3.3.4.5) */
1684         if (entry->ccmp) {
1685                 int i;
1686                 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1687                 int queue;
1688                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1689                         return RX_DROP_UNUSABLE;
1690                 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1691                 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1692                         pn[i]++;
1693                         if (pn[i])
1694                                 break;
1695                 }
1696                 queue = rx->security_idx;
1697                 rpn = rx->key->u.ccmp.rx_pn[queue];
1698                 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1699                         return RX_DROP_UNUSABLE;
1700                 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1701         }
1702
1703         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1704         __skb_queue_tail(&entry->skb_list, rx->skb);
1705         entry->last_frag = frag;
1706         entry->extra_len += rx->skb->len;
1707         if (ieee80211_has_morefrags(fc)) {
1708                 rx->skb = NULL;
1709                 return RX_QUEUED;
1710         }
1711
1712         rx->skb = __skb_dequeue(&entry->skb_list);
1713         if (skb_tailroom(rx->skb) < entry->extra_len) {
1714                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1715                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1716                                               GFP_ATOMIC))) {
1717                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1718                         __skb_queue_purge(&entry->skb_list);
1719                         return RX_DROP_UNUSABLE;
1720                 }
1721         }
1722         while ((skb = __skb_dequeue(&entry->skb_list))) {
1723                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1724                 dev_kfree_skb(skb);
1725         }
1726
1727         /* Complete frame has been reassembled - process it now */
1728         status = IEEE80211_SKB_RXCB(rx->skb);
1729         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1730
1731  out:
1732         if (rx->sta)
1733                 rx->sta->rx_packets++;
1734         if (is_multicast_ether_addr(hdr->addr1))
1735                 rx->local->dot11MulticastReceivedFrameCount++;
1736         else
1737                 ieee80211_led_rx(rx->local);
1738         return RX_CONTINUE;
1739 }
1740
1741 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1742 {
1743         if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1744                 return -EACCES;
1745
1746         return 0;
1747 }
1748
1749 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1750 {
1751         struct sk_buff *skb = rx->skb;
1752         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1753
1754         /*
1755          * Pass through unencrypted frames if the hardware has
1756          * decrypted them already.
1757          */
1758         if (status->flag & RX_FLAG_DECRYPTED)
1759                 return 0;
1760
1761         /* Drop unencrypted frames if key is set. */
1762         if (unlikely(!ieee80211_has_protected(fc) &&
1763                      !ieee80211_is_nullfunc(fc) &&
1764                      ieee80211_is_data(fc) &&
1765                      (rx->key || rx->sdata->drop_unencrypted)))
1766                 return -EACCES;
1767
1768         return 0;
1769 }
1770
1771 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1772 {
1773         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1774         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1775         __le16 fc = hdr->frame_control;
1776
1777         /*
1778          * Pass through unencrypted frames if the hardware has
1779          * decrypted them already.
1780          */
1781         if (status->flag & RX_FLAG_DECRYPTED)
1782                 return 0;
1783
1784         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1785                 if (unlikely(!ieee80211_has_protected(fc) &&
1786                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1787                              rx->key)) {
1788                         if (ieee80211_is_deauth(fc) ||
1789                             ieee80211_is_disassoc(fc))
1790                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1791                                                              rx->skb->data,
1792                                                              rx->skb->len);
1793                         return -EACCES;
1794                 }
1795                 /* BIP does not use Protected field, so need to check MMIE */
1796                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1797                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1798                         if (ieee80211_is_deauth(fc) ||
1799                             ieee80211_is_disassoc(fc))
1800                                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1801                                                              rx->skb->data,
1802                                                              rx->skb->len);
1803                         return -EACCES;
1804                 }
1805                 /*
1806                  * When using MFP, Action frames are not allowed prior to
1807                  * having configured keys.
1808                  */
1809                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1810                              ieee80211_is_robust_mgmt_frame(rx->skb)))
1811                         return -EACCES;
1812         }
1813
1814         return 0;
1815 }
1816
1817 static int
1818 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1819 {
1820         struct ieee80211_sub_if_data *sdata = rx->sdata;
1821         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1822         bool check_port_control = false;
1823         struct ethhdr *ehdr;
1824         int ret;
1825
1826         *port_control = false;
1827         if (ieee80211_has_a4(hdr->frame_control) &&
1828             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1829                 return -1;
1830
1831         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1832             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1833
1834                 if (!sdata->u.mgd.use_4addr)
1835                         return -1;
1836                 else
1837                         check_port_control = true;
1838         }
1839
1840         if (is_multicast_ether_addr(hdr->addr1) &&
1841             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1842                 return -1;
1843
1844         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1845         if (ret < 0)
1846                 return ret;
1847
1848         ehdr = (struct ethhdr *) rx->skb->data;
1849         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1850                 *port_control = true;
1851         else if (check_port_control)
1852                 return -1;
1853
1854         return 0;
1855 }
1856
1857 /*
1858  * requires that rx->skb is a frame with ethernet header
1859  */
1860 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1861 {
1862         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1863                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1864         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1865
1866         /*
1867          * Allow EAPOL frames to us/the PAE group address regardless
1868          * of whether the frame was encrypted or not.
1869          */
1870         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1871             (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1872              ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1873                 return true;
1874
1875         if (ieee80211_802_1x_port_control(rx) ||
1876             ieee80211_drop_unencrypted(rx, fc))
1877                 return false;
1878
1879         return true;
1880 }
1881
1882 /*
1883  * requires that rx->skb is a frame with ethernet header
1884  */
1885 static void
1886 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1887 {
1888         struct ieee80211_sub_if_data *sdata = rx->sdata;
1889         struct net_device *dev = sdata->dev;
1890         struct sk_buff *skb, *xmit_skb;
1891         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1892         struct sta_info *dsta;
1893         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1894
1895         skb = rx->skb;
1896         xmit_skb = NULL;
1897
1898         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1899              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1900             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1901             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1902             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1903                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1904                         /*
1905                          * send multicast frames both to higher layers in
1906                          * local net stack and back to the wireless medium
1907                          */
1908                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1909                         if (!xmit_skb)
1910                                 net_info_ratelimited("%s: failed to clone multicast frame\n",
1911                                                     dev->name);
1912                 } else {
1913                         dsta = sta_info_get(sdata, skb->data);
1914                         if (dsta) {
1915                                 /*
1916                                  * The destination station is associated to
1917                                  * this AP (in this VLAN), so send the frame
1918                                  * directly to it and do not pass it to local
1919                                  * net stack.
1920                                  */
1921                                 xmit_skb = skb;
1922                                 skb = NULL;
1923                         }
1924                 }
1925         }
1926
1927 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1928         if (skb) {
1929                 /* 'align' will only take the values 0 or 2 here since all
1930                  * frames are required to be aligned to 2-byte boundaries
1931                  * when being passed to mac80211; the code here works just
1932                  * as well if that isn't true, but mac80211 assumes it can
1933                  * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1934                  */
1935                 int align;
1936
1937                 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1938                 if (align) {
1939                         if (WARN_ON(skb_headroom(skb) < 3)) {
1940                                 dev_kfree_skb(skb);
1941                                 skb = NULL;
1942                         } else {
1943                                 u8 *data = skb->data;
1944                                 size_t len = skb_headlen(skb);
1945                                 skb->data -= align;
1946                                 memmove(skb->data, data, len);
1947                                 skb_set_tail_pointer(skb, len);
1948                         }
1949                 }
1950         }
1951 #endif
1952
1953         if (skb) {
1954                 /* deliver to local stack */
1955                 skb->protocol = eth_type_trans(skb, dev);
1956                 memset(skb->cb, 0, sizeof(skb->cb));
1957                 if (rx->local->napi)
1958                         napi_gro_receive(rx->local->napi, skb);
1959                 else
1960                         netif_receive_skb(skb);
1961         }
1962
1963         if (xmit_skb) {
1964                 /*
1965                  * Send to wireless media and increase priority by 256 to
1966                  * keep the received priority instead of reclassifying
1967                  * the frame (see cfg80211_classify8021d).
1968                  */
1969                 xmit_skb->priority += 256;
1970                 xmit_skb->protocol = htons(ETH_P_802_3);
1971                 skb_reset_network_header(xmit_skb);
1972                 skb_reset_mac_header(xmit_skb);
1973                 dev_queue_xmit(xmit_skb);
1974         }
1975 }
1976
1977 static ieee80211_rx_result debug_noinline
1978 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1979 {
1980         struct net_device *dev = rx->sdata->dev;
1981         struct sk_buff *skb = rx->skb;
1982         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1983         __le16 fc = hdr->frame_control;
1984         struct sk_buff_head frame_list;
1985         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1986
1987         if (unlikely(!ieee80211_is_data(fc)))
1988                 return RX_CONTINUE;
1989
1990         if (unlikely(!ieee80211_is_data_present(fc)))
1991                 return RX_DROP_MONITOR;
1992
1993         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1994                 return RX_CONTINUE;
1995
1996         if (ieee80211_has_a4(hdr->frame_control) &&
1997             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1998             !rx->sdata->u.vlan.sta)
1999                 return RX_DROP_UNUSABLE;
2000
2001         if (is_multicast_ether_addr(hdr->addr1) &&
2002             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2003               rx->sdata->u.vlan.sta) ||
2004              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2005               rx->sdata->u.mgd.use_4addr)))
2006                 return RX_DROP_UNUSABLE;
2007
2008         skb->dev = dev;
2009         __skb_queue_head_init(&frame_list);
2010
2011         if (skb_linearize(skb))
2012                 return RX_DROP_UNUSABLE;
2013
2014         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2015                                  rx->sdata->vif.type,
2016                                  rx->local->hw.extra_tx_headroom, true);
2017
2018         while (!skb_queue_empty(&frame_list)) {
2019                 rx->skb = __skb_dequeue(&frame_list);
2020
2021                 if (!ieee80211_frame_allowed(rx, fc)) {
2022                         dev_kfree_skb(rx->skb);
2023                         continue;
2024                 }
2025                 dev->stats.rx_packets++;
2026                 dev->stats.rx_bytes += rx->skb->len;
2027
2028                 ieee80211_deliver_skb(rx);
2029         }
2030
2031         return RX_QUEUED;
2032 }
2033
2034 #ifdef CONFIG_MAC80211_MESH
2035 static ieee80211_rx_result
2036 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2037 {
2038         struct ieee80211_hdr *fwd_hdr, *hdr;
2039         struct ieee80211_tx_info *info;
2040         struct ieee80211s_hdr *mesh_hdr;
2041         struct sk_buff *skb = rx->skb, *fwd_skb;
2042         struct ieee80211_local *local = rx->local;
2043         struct ieee80211_sub_if_data *sdata = rx->sdata;
2044         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2045         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2046         u16 q, hdrlen;
2047
2048         hdr = (struct ieee80211_hdr *) skb->data;
2049         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2050
2051         /* make sure fixed part of mesh header is there, also checks skb len */
2052         if (!pskb_may_pull(rx->skb, hdrlen + 6))
2053                 return RX_DROP_MONITOR;
2054
2055         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2056
2057         /* make sure full mesh header is there, also checks skb len */
2058         if (!pskb_may_pull(rx->skb,
2059                            hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2060                 return RX_DROP_MONITOR;
2061
2062         /* reload pointers */
2063         hdr = (struct ieee80211_hdr *) skb->data;
2064         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2065
2066         /* frame is in RMC, don't forward */
2067         if (ieee80211_is_data(hdr->frame_control) &&
2068             is_multicast_ether_addr(hdr->addr1) &&
2069             mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2070                 return RX_DROP_MONITOR;
2071
2072         if (!ieee80211_is_data(hdr->frame_control) ||
2073             !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2074                 return RX_CONTINUE;
2075
2076         if (!mesh_hdr->ttl)
2077                 return RX_DROP_MONITOR;
2078
2079         if (mesh_hdr->flags & MESH_FLAGS_AE) {
2080                 struct mesh_path *mppath;
2081                 char *proxied_addr;
2082                 char *mpp_addr;
2083
2084                 if (is_multicast_ether_addr(hdr->addr1)) {
2085                         mpp_addr = hdr->addr3;
2086                         proxied_addr = mesh_hdr->eaddr1;
2087                 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2088                         /* has_a4 already checked in ieee80211_rx_mesh_check */
2089                         mpp_addr = hdr->addr4;
2090                         proxied_addr = mesh_hdr->eaddr2;
2091                 } else {
2092                         return RX_DROP_MONITOR;
2093                 }
2094
2095                 rcu_read_lock();
2096                 mppath = mpp_path_lookup(sdata, proxied_addr);
2097                 if (!mppath) {
2098                         mpp_path_add(sdata, proxied_addr, mpp_addr);
2099                 } else {
2100                         spin_lock_bh(&mppath->state_lock);
2101                         if (!ether_addr_equal(mppath->mpp, mpp_addr))
2102                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2103                         spin_unlock_bh(&mppath->state_lock);
2104                 }
2105                 rcu_read_unlock();
2106         }
2107
2108         /* Frame has reached destination.  Don't forward */
2109         if (!is_multicast_ether_addr(hdr->addr1) &&
2110             ether_addr_equal(sdata->vif.addr, hdr->addr3))
2111                 return RX_CONTINUE;
2112
2113         q = ieee80211_select_queue_80211(sdata, skb, hdr);
2114         if (ieee80211_queue_stopped(&local->hw, q)) {
2115                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2116                 return RX_DROP_MONITOR;
2117         }
2118         skb_set_queue_mapping(skb, q);
2119
2120         if (!--mesh_hdr->ttl) {
2121                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2122                 goto out;
2123         }
2124
2125         if (!ifmsh->mshcfg.dot11MeshForwarding)
2126                 goto out;
2127
2128         fwd_skb = skb_copy(skb, GFP_ATOMIC);
2129         if (!fwd_skb) {
2130                 net_info_ratelimited("%s: failed to clone mesh frame\n",
2131                                     sdata->name);
2132                 goto out;
2133         }
2134
2135         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
2136         fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2137         info = IEEE80211_SKB_CB(fwd_skb);
2138         memset(info, 0, sizeof(*info));
2139         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2140         info->control.vif = &rx->sdata->vif;
2141         info->control.jiffies = jiffies;
2142         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2143                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2144                 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2145                 /* update power mode indication when forwarding */
2146                 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2147         } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2148                 /* mesh power mode flags updated in mesh_nexthop_lookup */
2149                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2150         } else {
2151                 /* unable to resolve next hop */
2152                 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2153                                    fwd_hdr->addr3, 0,
2154                                    WLAN_REASON_MESH_PATH_NOFORWARD,
2155                                    fwd_hdr->addr2);
2156                 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2157                 kfree_skb(fwd_skb);
2158                 return RX_DROP_MONITOR;
2159         }
2160
2161         IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2162         ieee80211_add_pending_skb(local, fwd_skb);
2163  out:
2164         if (is_multicast_ether_addr(hdr->addr1) ||
2165             sdata->dev->flags & IFF_PROMISC)
2166                 return RX_CONTINUE;
2167         else
2168                 return RX_DROP_MONITOR;
2169 }
2170 #endif
2171
2172 static ieee80211_rx_result debug_noinline
2173 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2174 {
2175         struct ieee80211_sub_if_data *sdata = rx->sdata;
2176         struct ieee80211_local *local = rx->local;
2177         struct net_device *dev = sdata->dev;
2178         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2179         __le16 fc = hdr->frame_control;
2180         bool port_control;
2181         int err;
2182
2183         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2184                 return RX_CONTINUE;
2185
2186         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2187                 return RX_DROP_MONITOR;
2188
2189         /*
2190          * Send unexpected-4addr-frame event to hostapd. For older versions,
2191          * also drop the frame to cooked monitor interfaces.
2192          */
2193         if (ieee80211_has_a4(hdr->frame_control) &&
2194             sdata->vif.type == NL80211_IFTYPE_AP) {
2195                 if (rx->sta &&
2196                     !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2197                         cfg80211_rx_unexpected_4addr_frame(
2198                                 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2199                 return RX_DROP_MONITOR;
2200         }
2201
2202         err = __ieee80211_data_to_8023(rx, &port_control);
2203         if (unlikely(err))
2204                 return RX_DROP_UNUSABLE;
2205
2206         if (!ieee80211_frame_allowed(rx, fc))
2207                 return RX_DROP_MONITOR;
2208
2209         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2210             unlikely(port_control) && sdata->bss) {
2211                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2212                                      u.ap);
2213                 dev = sdata->dev;
2214                 rx->sdata = sdata;
2215         }
2216
2217         rx->skb->dev = dev;
2218
2219         dev->stats.rx_packets++;
2220         dev->stats.rx_bytes += rx->skb->len;
2221
2222         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2223             !is_multicast_ether_addr(
2224                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2225             (!local->scanning &&
2226              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2227                         mod_timer(&local->dynamic_ps_timer, jiffies +
2228                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2229         }
2230
2231         ieee80211_deliver_skb(rx);
2232
2233         return RX_QUEUED;
2234 }
2235
2236 static ieee80211_rx_result debug_noinline
2237 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2238 {
2239         struct sk_buff *skb = rx->skb;
2240         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2241         struct tid_ampdu_rx *tid_agg_rx;
2242         u16 start_seq_num;
2243         u16 tid;
2244
2245         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2246                 return RX_CONTINUE;
2247
2248         if (ieee80211_is_back_req(bar->frame_control)) {
2249                 struct {
2250                         __le16 control, start_seq_num;
2251                 } __packed bar_data;
2252
2253                 if (!rx->sta)
2254                         return RX_DROP_MONITOR;
2255
2256                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2257                                   &bar_data, sizeof(bar_data)))
2258                         return RX_DROP_MONITOR;
2259
2260                 tid = le16_to_cpu(bar_data.control) >> 12;
2261
2262                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2263                 if (!tid_agg_rx)
2264                         return RX_DROP_MONITOR;
2265
2266                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2267
2268                 /* reset session timer */
2269                 if (tid_agg_rx->timeout)
2270                         mod_timer(&tid_agg_rx->session_timer,
2271                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2272
2273                 spin_lock(&tid_agg_rx->reorder_lock);
2274                 /* release stored frames up to start of BAR */
2275                 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2276                                                  start_seq_num, frames);
2277                 spin_unlock(&tid_agg_rx->reorder_lock);
2278
2279                 kfree_skb(skb);
2280                 return RX_QUEUED;
2281         }
2282
2283         /*
2284          * After this point, we only want management frames,
2285          * so we can drop all remaining control frames to
2286          * cooked monitor interfaces.
2287          */
2288         return RX_DROP_MONITOR;
2289 }
2290
2291 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2292                                            struct ieee80211_mgmt *mgmt,
2293                                            size_t len)
2294 {
2295         struct ieee80211_local *local = sdata->local;
2296         struct sk_buff *skb;
2297         struct ieee80211_mgmt *resp;
2298
2299         if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2300                 /* Not to own unicast address */
2301                 return;
2302         }
2303
2304         if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2305             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2306                 /* Not from the current AP or not associated yet. */
2307                 return;
2308         }
2309
2310         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2311                 /* Too short SA Query request frame */
2312                 return;
2313         }
2314
2315         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2316         if (skb == NULL)
2317                 return;
2318
2319         skb_reserve(skb, local->hw.extra_tx_headroom);
2320         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2321         memset(resp, 0, 24);
2322         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2323         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2324         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2325         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2326                                           IEEE80211_STYPE_ACTION);
2327         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2328         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2329         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2330         memcpy(resp->u.action.u.sa_query.trans_id,
2331                mgmt->u.action.u.sa_query.trans_id,
2332                WLAN_SA_QUERY_TR_ID_LEN);
2333
2334         ieee80211_tx_skb(sdata, skb);
2335 }
2336
2337 static ieee80211_rx_result debug_noinline
2338 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2339 {
2340         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2341         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2342
2343         /*
2344          * From here on, look only at management frames.
2345          * Data and control frames are already handled,
2346          * and unknown (reserved) frames are useless.
2347          */
2348         if (rx->skb->len < 24)
2349                 return RX_DROP_MONITOR;
2350
2351         if (!ieee80211_is_mgmt(mgmt->frame_control))
2352                 return RX_DROP_MONITOR;
2353
2354         if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2355             ieee80211_is_beacon(mgmt->frame_control) &&
2356             !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2357                 int sig = 0;
2358
2359                 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2360                         sig = status->signal;
2361
2362                 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2363                                             rx->skb->data, rx->skb->len,
2364                                             status->freq, sig);
2365                 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2366         }
2367
2368         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2369                 return RX_DROP_MONITOR;
2370
2371         if (ieee80211_drop_unencrypted_mgmt(rx))
2372                 return RX_DROP_UNUSABLE;
2373
2374         return RX_CONTINUE;
2375 }
2376
2377 static ieee80211_rx_result debug_noinline
2378 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2379 {
2380         struct ieee80211_local *local = rx->local;
2381         struct ieee80211_sub_if_data *sdata = rx->sdata;
2382         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2383         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2384         int len = rx->skb->len;
2385
2386         if (!ieee80211_is_action(mgmt->frame_control))
2387                 return RX_CONTINUE;
2388
2389         /* drop too small frames */
2390         if (len < IEEE80211_MIN_ACTION_SIZE)
2391                 return RX_DROP_UNUSABLE;
2392
2393         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2394             mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2395             mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2396                 return RX_DROP_UNUSABLE;
2397
2398         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2399                 return RX_DROP_UNUSABLE;
2400
2401         switch (mgmt->u.action.category) {
2402         case WLAN_CATEGORY_HT:
2403                 /* reject HT action frames from stations not supporting HT */
2404                 if (!rx->sta->sta.ht_cap.ht_supported)
2405                         goto invalid;
2406
2407                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2408                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2409                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2410                     sdata->vif.type != NL80211_IFTYPE_AP &&
2411                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2412                         break;
2413
2414                 /* verify action & smps_control/chanwidth are present */
2415                 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2416                         goto invalid;
2417
2418                 switch (mgmt->u.action.u.ht_smps.action) {
2419                 case WLAN_HT_ACTION_SMPS: {
2420                         struct ieee80211_supported_band *sband;
2421                         enum ieee80211_smps_mode smps_mode;
2422
2423                         /* convert to HT capability */
2424                         switch (mgmt->u.action.u.ht_smps.smps_control) {
2425                         case WLAN_HT_SMPS_CONTROL_DISABLED:
2426                                 smps_mode = IEEE80211_SMPS_OFF;
2427                                 break;
2428                         case WLAN_HT_SMPS_CONTROL_STATIC:
2429                                 smps_mode = IEEE80211_SMPS_STATIC;
2430                                 break;
2431                         case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2432                                 smps_mode = IEEE80211_SMPS_DYNAMIC;
2433                                 break;
2434                         default:
2435                                 goto invalid;
2436                         }
2437
2438                         /* if no change do nothing */
2439                         if (rx->sta->sta.smps_mode == smps_mode)
2440                                 goto handled;
2441                         rx->sta->sta.smps_mode = smps_mode;
2442
2443                         sband = rx->local->hw.wiphy->bands[status->band];
2444
2445                         rate_control_rate_update(local, sband, rx->sta,
2446                                                  IEEE80211_RC_SMPS_CHANGED);
2447                         goto handled;
2448                 }
2449                 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2450                         struct ieee80211_supported_band *sband;
2451                         u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2452                         enum ieee80211_sta_rx_bandwidth new_bw;
2453
2454                         /* If it doesn't support 40 MHz it can't change ... */
2455                         if (!(rx->sta->sta.ht_cap.cap &
2456                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2457                                 goto handled;
2458
2459                         if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2460                                 new_bw = IEEE80211_STA_RX_BW_20;
2461                         else
2462                                 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2463
2464                         if (rx->sta->sta.bandwidth == new_bw)
2465                                 goto handled;
2466
2467                         sband = rx->local->hw.wiphy->bands[status->band];
2468
2469                         rate_control_rate_update(local, sband, rx->sta,
2470                                                  IEEE80211_RC_BW_CHANGED);
2471                         goto handled;
2472                 }
2473                 default:
2474                         goto invalid;
2475                 }
2476
2477                 break;
2478         case WLAN_CATEGORY_PUBLIC:
2479                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2480                         goto invalid;
2481                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2482                         break;
2483                 if (!rx->sta)
2484                         break;
2485                 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2486                         break;
2487                 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2488                                 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2489                         break;
2490                 if (len < offsetof(struct ieee80211_mgmt,
2491                                    u.action.u.ext_chan_switch.variable))
2492                         goto invalid;
2493                 goto queue;
2494         case WLAN_CATEGORY_VHT:
2495                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2496                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2497                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2498                     sdata->vif.type != NL80211_IFTYPE_AP &&
2499                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2500                         break;
2501
2502                 /* verify action code is present */
2503                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2504                         goto invalid;
2505
2506                 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2507                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2508                         u8 opmode;
2509
2510                         /* verify opmode is present */
2511                         if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2512                                 goto invalid;
2513
2514                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2515
2516                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2517                                                     opmode, status->band,
2518                                                     false);
2519                         goto handled;
2520                 }
2521                 default:
2522                         break;
2523                 }
2524                 break;
2525         case WLAN_CATEGORY_BACK:
2526                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2527                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2528                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2529                     sdata->vif.type != NL80211_IFTYPE_AP &&
2530                     sdata->vif.type != NL80211_IFTYPE_ADHOC)
2531                         break;
2532
2533                 /* verify action_code is present */
2534                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2535                         break;
2536
2537                 switch (mgmt->u.action.u.addba_req.action_code) {
2538                 case WLAN_ACTION_ADDBA_REQ:
2539                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2540                                    sizeof(mgmt->u.action.u.addba_req)))
2541                                 goto invalid;
2542                         break;
2543                 case WLAN_ACTION_ADDBA_RESP:
2544                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2545                                    sizeof(mgmt->u.action.u.addba_resp)))
2546                                 goto invalid;
2547                         break;
2548                 case WLAN_ACTION_DELBA:
2549                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2550                                    sizeof(mgmt->u.action.u.delba)))
2551                                 goto invalid;
2552                         break;
2553                 default:
2554                         goto invalid;
2555                 }
2556
2557                 goto queue;
2558         case WLAN_CATEGORY_SPECTRUM_MGMT:
2559                 /* verify action_code is present */
2560                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2561                         break;
2562
2563                 switch (mgmt->u.action.u.measurement.action_code) {
2564                 case WLAN_ACTION_SPCT_MSR_REQ:
2565                         if (status->band != IEEE80211_BAND_5GHZ)
2566                                 break;
2567
2568                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2569                                    sizeof(mgmt->u.action.u.measurement)))
2570                                 break;
2571
2572                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2573                                 break;
2574
2575                         ieee80211_process_measurement_req(sdata, mgmt, len);
2576                         goto handled;
2577                 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2578                         u8 *bssid;
2579                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2580                                    sizeof(mgmt->u.action.u.chan_switch)))
2581                                 break;
2582
2583                         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2584                             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2585                             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2586                                 break;
2587
2588                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2589                                 bssid = sdata->u.mgd.bssid;
2590                         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2591                                 bssid = sdata->u.ibss.bssid;
2592                         else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2593                                 bssid = mgmt->sa;
2594                         else
2595                                 break;
2596
2597                         if (!ether_addr_equal(mgmt->bssid, bssid))
2598                                 break;
2599
2600                         goto queue;
2601                         }
2602                 }
2603                 break;
2604         case WLAN_CATEGORY_SA_QUERY:
2605                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2606                            sizeof(mgmt->u.action.u.sa_query)))
2607                         break;
2608
2609                 switch (mgmt->u.action.u.sa_query.action) {
2610                 case WLAN_ACTION_SA_QUERY_REQUEST:
2611                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2612                                 break;
2613                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2614                         goto handled;
2615                 }
2616                 break;
2617         case WLAN_CATEGORY_SELF_PROTECTED:
2618                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2619                            sizeof(mgmt->u.action.u.self_prot.action_code)))
2620                         break;
2621
2622                 switch (mgmt->u.action.u.self_prot.action_code) {
2623                 case WLAN_SP_MESH_PEERING_OPEN:
2624                 case WLAN_SP_MESH_PEERING_CLOSE:
2625                 case WLAN_SP_MESH_PEERING_CONFIRM:
2626                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2627                                 goto invalid;
2628                         if (sdata->u.mesh.user_mpm)
2629                                 /* userspace handles this frame */
2630                                 break;
2631                         goto queue;
2632                 case WLAN_SP_MGK_INFORM:
2633                 case WLAN_SP_MGK_ACK:
2634                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2635                                 goto invalid;
2636                         break;
2637                 }
2638                 break;
2639         case WLAN_CATEGORY_MESH_ACTION:
2640                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2641                            sizeof(mgmt->u.action.u.mesh_action.action_code)))
2642                         break;
2643
2644                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2645                         break;
2646                 if (mesh_action_is_path_sel(mgmt) &&
2647                     !mesh_path_sel_is_hwmp(sdata))
2648                         break;
2649                 goto queue;
2650         }
2651
2652         return RX_CONTINUE;
2653
2654  invalid:
2655         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2656         /* will return in the next handlers */
2657         return RX_CONTINUE;
2658
2659  handled:
2660         if (rx->sta)
2661                 rx->sta->rx_packets++;
2662         dev_kfree_skb(rx->skb);
2663         return RX_QUEUED;
2664
2665  queue:
2666         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2667         skb_queue_tail(&sdata->skb_queue, rx->skb);
2668         ieee80211_queue_work(&local->hw, &sdata->work);
2669         if (rx->sta)
2670                 rx->sta->rx_packets++;
2671         return RX_QUEUED;
2672 }
2673
2674 static ieee80211_rx_result debug_noinline
2675 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2676 {
2677         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2678         int sig = 0;
2679
2680         /* skip known-bad action frames and return them in the next handler */
2681         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2682                 return RX_CONTINUE;
2683
2684         /*
2685          * Getting here means the kernel doesn't know how to handle
2686          * it, but maybe userspace does ... include returned frames
2687          * so userspace can register for those to know whether ones
2688          * it transmitted were processed or returned.
2689          */
2690
2691         if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2692                 sig = status->signal;
2693
2694         if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2695                              rx->skb->data, rx->skb->len, 0, GFP_ATOMIC)) {
2696                 if (rx->sta)
2697                         rx->sta->rx_packets++;
2698                 dev_kfree_skb(rx->skb);
2699                 return RX_QUEUED;
2700         }
2701
2702         return RX_CONTINUE;
2703 }
2704
2705 static ieee80211_rx_result debug_noinline
2706 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2707 {
2708         struct ieee80211_local *local = rx->local;
2709         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2710         struct sk_buff *nskb;
2711         struct ieee80211_sub_if_data *sdata = rx->sdata;
2712         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2713
2714         if (!ieee80211_is_action(mgmt->frame_control))
2715                 return RX_CONTINUE;
2716
2717         /*
2718          * For AP mode, hostapd is responsible for handling any action
2719          * frames that we didn't handle, including returning unknown
2720          * ones. For all other modes we will return them to the sender,
2721          * setting the 0x80 bit in the action category, as required by
2722          * 802.11-2012 9.24.4.
2723          * Newer versions of hostapd shall also use the management frame
2724          * registration mechanisms, but older ones still use cooked
2725          * monitor interfaces so push all frames there.
2726          */
2727         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2728             (sdata->vif.type == NL80211_IFTYPE_AP ||
2729              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2730                 return RX_DROP_MONITOR;
2731
2732         if (is_multicast_ether_addr(mgmt->da))
2733                 return RX_DROP_MONITOR;
2734
2735         /* do not return rejected action frames */
2736         if (mgmt->u.action.category & 0x80)
2737                 return RX_DROP_UNUSABLE;
2738
2739         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2740                                GFP_ATOMIC);
2741         if (nskb) {
2742                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2743
2744                 nmgmt->u.action.category |= 0x80;
2745                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2746                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2747
2748                 memset(nskb->cb, 0, sizeof(nskb->cb));
2749
2750                 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2751                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2752
2753                         info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2754                                       IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2755                                       IEEE80211_TX_CTL_NO_CCK_RATE;
2756                         if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2757                                 info->hw_queue =
2758                                         local->hw.offchannel_tx_hw_queue;
2759                 }
2760
2761                 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2762                                             status->band);
2763         }
2764         dev_kfree_skb(rx->skb);
2765         return RX_QUEUED;
2766 }
2767
2768 static ieee80211_rx_result debug_noinline
2769 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2770 {
2771         struct ieee80211_sub_if_data *sdata = rx->sdata;
2772         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2773         __le16 stype;
2774
2775         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2776
2777         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2778             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2779             sdata->vif.type != NL80211_IFTYPE_STATION)
2780                 return RX_DROP_MONITOR;
2781
2782         switch (stype) {
2783         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2784         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2785         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2786                 /* process for all: mesh, mlme, ibss */
2787                 break;
2788         case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2789         case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2790         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2791         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2792                 if (is_multicast_ether_addr(mgmt->da) &&
2793                     !is_broadcast_ether_addr(mgmt->da))
2794                         return RX_DROP_MONITOR;
2795
2796                 /* process only for station */
2797                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2798                         return RX_DROP_MONITOR;
2799                 break;
2800         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2801                 /* process only for ibss and mesh */
2802                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2803                     sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2804                         return RX_DROP_MONITOR;
2805                 break;
2806         default:
2807                 return RX_DROP_MONITOR;
2808         }
2809
2810         /* queue up frame and kick off work to process it */
2811         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2812         skb_queue_tail(&sdata->skb_queue, rx->skb);
2813         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2814         if (rx->sta)
2815                 rx->sta->rx_packets++;
2816
2817         return RX_QUEUED;
2818 }
2819
2820 /* TODO: use IEEE80211_RX_FRAGMENTED */
2821 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2822                                         struct ieee80211_rate *rate)
2823 {
2824         struct ieee80211_sub_if_data *sdata;
2825         struct ieee80211_local *local = rx->local;
2826         struct sk_buff *skb = rx->skb, *skb2;
2827         struct net_device *prev_dev = NULL;
2828         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2829         int needed_headroom;
2830
2831         /*
2832          * If cooked monitor has been processed already, then
2833          * don't do it again. If not, set the flag.
2834          */
2835         if (rx->flags & IEEE80211_RX_CMNTR)
2836                 goto out_free_skb;
2837         rx->flags |= IEEE80211_RX_CMNTR;
2838
2839         /* If there are no cooked monitor interfaces, just free the SKB */
2840         if (!local->cooked_mntrs)
2841                 goto out_free_skb;
2842
2843         /* room for the radiotap header based on driver features */
2844         needed_headroom = ieee80211_rx_radiotap_space(local, status);
2845
2846         if (skb_headroom(skb) < needed_headroom &&
2847             pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2848                 goto out_free_skb;
2849
2850         /* prepend radiotap information */
2851         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2852                                          false);
2853
2854         skb_set_mac_header(skb, 0);
2855         skb->ip_summed = CHECKSUM_UNNECESSARY;
2856         skb->pkt_type = PACKET_OTHERHOST;
2857         skb->protocol = htons(ETH_P_802_2);
2858
2859         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2860                 if (!ieee80211_sdata_running(sdata))
2861                         continue;
2862
2863                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2864                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2865                         continue;
2866
2867                 if (prev_dev) {
2868                         skb2 = skb_clone(skb, GFP_ATOMIC);
2869                         if (skb2) {
2870                                 skb2->dev = prev_dev;
2871                                 netif_receive_skb(skb2);
2872                         }
2873                 }
2874
2875                 prev_dev = sdata->dev;
2876                 sdata->dev->stats.rx_packets++;
2877                 sdata->dev->stats.rx_bytes += skb->len;
2878         }
2879
2880         if (prev_dev) {
2881                 skb->dev = prev_dev;
2882                 netif_receive_skb(skb);
2883                 return;
2884         }
2885
2886  out_free_skb:
2887         dev_kfree_skb(skb);
2888 }
2889
2890 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2891                                          ieee80211_rx_result res)
2892 {
2893         switch (res) {
2894         case RX_DROP_MONITOR:
2895                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2896                 if (rx->sta)
2897                         rx->sta->rx_dropped++;
2898                 /* fall through */
2899         case RX_CONTINUE: {
2900                 struct ieee80211_rate *rate = NULL;
2901                 struct ieee80211_supported_band *sband;
2902                 struct ieee80211_rx_status *status;
2903
2904                 status = IEEE80211_SKB_RXCB((rx->skb));
2905
2906                 sband = rx->local->hw.wiphy->bands[status->band];
2907                 if (!(status->flag & RX_FLAG_HT) &&
2908                     !(status->flag & RX_FLAG_VHT))
2909                         rate = &sband->bitrates[status->rate_idx];
2910
2911                 ieee80211_rx_cooked_monitor(rx, rate);
2912                 break;
2913                 }
2914         case RX_DROP_UNUSABLE:
2915                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2916                 if (rx->sta)
2917                         rx->sta->rx_dropped++;
2918                 dev_kfree_skb(rx->skb);
2919                 break;
2920         case RX_QUEUED:
2921                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2922                 break;
2923         }
2924 }
2925
2926 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2927                                   struct sk_buff_head *frames)
2928 {
2929         ieee80211_rx_result res = RX_DROP_MONITOR;
2930         struct sk_buff *skb;
2931
2932 #define CALL_RXH(rxh)                   \
2933         do {                            \
2934                 res = rxh(rx);          \
2935                 if (res != RX_CONTINUE) \
2936                         goto rxh_next;  \
2937         } while (0);
2938
2939         spin_lock_bh(&rx->local->rx_path_lock);
2940
2941         while ((skb = __skb_dequeue(frames))) {
2942                 /*
2943                  * all the other fields are valid across frames
2944                  * that belong to an aMPDU since they are on the
2945                  * same TID from the same station
2946                  */
2947                 rx->skb = skb;
2948
2949                 CALL_RXH(ieee80211_rx_h_check_more_data)
2950                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2951                 CALL_RXH(ieee80211_rx_h_sta_process)
2952                 CALL_RXH(ieee80211_rx_h_decrypt)
2953                 CALL_RXH(ieee80211_rx_h_defragment)
2954                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2955                 /* must be after MMIC verify so header is counted in MPDU mic */
2956 #ifdef CONFIG_MAC80211_MESH
2957                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2958                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2959 #endif
2960                 CALL_RXH(ieee80211_rx_h_amsdu)
2961                 CALL_RXH(ieee80211_rx_h_data)
2962
2963                 /* special treatment -- needs the queue */
2964                 res = ieee80211_rx_h_ctrl(rx, frames);
2965                 if (res != RX_CONTINUE)
2966                         goto rxh_next;
2967
2968                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2969                 CALL_RXH(ieee80211_rx_h_action)
2970                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2971                 CALL_RXH(ieee80211_rx_h_action_return)
2972                 CALL_RXH(ieee80211_rx_h_mgmt)
2973
2974  rxh_next:
2975                 ieee80211_rx_handlers_result(rx, res);
2976
2977 #undef CALL_RXH
2978         }
2979
2980         spin_unlock_bh(&rx->local->rx_path_lock);
2981 }
2982
2983 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2984 {
2985         struct sk_buff_head reorder_release;
2986         ieee80211_rx_result res = RX_DROP_MONITOR;
2987
2988         __skb_queue_head_init(&reorder_release);
2989
2990 #define CALL_RXH(rxh)                   \
2991         do {                            \
2992                 res = rxh(rx);          \
2993                 if (res != RX_CONTINUE) \
2994                         goto rxh_next;  \
2995         } while (0);
2996
2997         CALL_RXH(ieee80211_rx_h_check)
2998
2999         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3000
3001         ieee80211_rx_handlers(rx, &reorder_release);
3002         return;
3003
3004  rxh_next:
3005         ieee80211_rx_handlers_result(rx, res);
3006
3007 #undef CALL_RXH
3008 }
3009
3010 /*
3011  * This function makes calls into the RX path, therefore
3012  * it has to be invoked under RCU read lock.
3013  */
3014 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3015 {
3016         struct sk_buff_head frames;
3017         struct ieee80211_rx_data rx = {
3018                 .sta = sta,
3019                 .sdata = sta->sdata,
3020                 .local = sta->local,
3021                 /* This is OK -- must be QoS data frame */
3022                 .security_idx = tid,
3023                 .seqno_idx = tid,
3024                 .flags = 0,
3025         };
3026         struct tid_ampdu_rx *tid_agg_rx;
3027
3028         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3029         if (!tid_agg_rx)
3030                 return;
3031
3032         __skb_queue_head_init(&frames);
3033
3034         spin_lock(&tid_agg_rx->reorder_lock);
3035         ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3036         spin_unlock(&tid_agg_rx->reorder_lock);
3037
3038         ieee80211_rx_handlers(&rx, &frames);
3039 }
3040
3041 /* main receive path */
3042
3043 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3044                                  struct ieee80211_hdr *hdr)
3045 {
3046         struct ieee80211_sub_if_data *sdata = rx->sdata;
3047         struct sk_buff *skb = rx->skb;
3048         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3049         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3050         int multicast = is_multicast_ether_addr(hdr->addr1);
3051
3052         switch (sdata->vif.type) {
3053         case NL80211_IFTYPE_STATION:
3054                 if (!bssid && !sdata->u.mgd.use_4addr)
3055                         return false;
3056                 if (!multicast &&
3057                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3058                         if (!(sdata->dev->flags & IFF_PROMISC) ||
3059                             sdata->u.mgd.use_4addr)
3060                                 return false;
3061                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3062                 }
3063                 break;
3064         case NL80211_IFTYPE_ADHOC:
3065                 if (!bssid)
3066                         return false;
3067                 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3068                     ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3069                         return false;
3070                 if (ieee80211_is_beacon(hdr->frame_control)) {
3071                         return true;
3072                 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3073                         return false;
3074                 } else if (!multicast &&
3075                            !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3076                         if (!(sdata->dev->flags & IFF_PROMISC))
3077                                 return false;
3078                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3079                 } else if (!rx->sta) {
3080                         int rate_idx;
3081                         if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3082                                 rate_idx = 0; /* TODO: HT/VHT rates */
3083                         else
3084                                 rate_idx = status->rate_idx;
3085                         ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3086                                                  BIT(rate_idx));
3087                 }
3088                 break;
3089         case NL80211_IFTYPE_MESH_POINT:
3090                 if (!multicast &&
3091                     !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3092                         if (!(sdata->dev->flags & IFF_PROMISC))
3093                                 return false;
3094
3095                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3096                 }
3097                 break;
3098         case NL80211_IFTYPE_AP_VLAN:
3099         case NL80211_IFTYPE_AP:
3100                 if (!bssid) {
3101                         if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3102                                 return false;
3103                 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3104                         /*
3105                          * Accept public action frames even when the
3106                          * BSSID doesn't match, this is used for P2P
3107                          * and location updates. Note that mac80211
3108                          * itself never looks at these frames.
3109                          */
3110                         if (!multicast &&
3111                             !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3112                                 return false;
3113                         if (ieee80211_is_public_action(hdr, skb->len))
3114                                 return true;
3115                         if (!ieee80211_is_beacon(hdr->frame_control))
3116                                 return false;
3117                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3118                 }
3119                 break;
3120         case NL80211_IFTYPE_WDS:
3121                 if (bssid || !ieee80211_is_data(hdr->frame_control))
3122                         return false;
3123                 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3124                         return false;
3125                 break;
3126         case NL80211_IFTYPE_P2P_DEVICE:
3127                 if (!ieee80211_is_public_action(hdr, skb->len) &&
3128                     !ieee80211_is_probe_req(hdr->frame_control) &&
3129                     !ieee80211_is_probe_resp(hdr->frame_control) &&
3130                     !ieee80211_is_beacon(hdr->frame_control))
3131                         return false;
3132                 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3133                     !multicast)
3134                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3135                 break;
3136         default:
3137                 /* should never get here */
3138                 WARN_ON_ONCE(1);
3139                 break;
3140         }
3141
3142         return true;
3143 }
3144
3145 /*
3146  * This function returns whether or not the SKB
3147  * was destined for RX processing or not, which,
3148  * if consume is true, is equivalent to whether
3149  * or not the skb was consumed.
3150  */
3151 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3152                                             struct sk_buff *skb, bool consume)
3153 {
3154         struct ieee80211_local *local = rx->local;
3155         struct ieee80211_sub_if_data *sdata = rx->sdata;
3156         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3157         struct ieee80211_hdr *hdr = (void *)skb->data;
3158
3159         rx->skb = skb;
3160         status->rx_flags |= IEEE80211_RX_RA_MATCH;
3161
3162         if (!prepare_for_handlers(rx, hdr))
3163                 return false;
3164
3165         if (!consume) {
3166                 skb = skb_copy(skb, GFP_ATOMIC);
3167                 if (!skb) {
3168                         if (net_ratelimit())
3169                                 wiphy_debug(local->hw.wiphy,
3170                                         "failed to copy skb for %s\n",
3171                                         sdata->name);
3172                         return true;
3173                 }
3174
3175                 rx->skb = skb;
3176         }
3177
3178         ieee80211_invoke_rx_handlers(rx);
3179         return true;
3180 }
3181
3182 /*
3183  * This is the actual Rx frames handler. as it blongs to Rx path it must
3184  * be called with rcu_read_lock protection.
3185  */
3186 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3187                                          struct sk_buff *skb)
3188 {
3189         struct ieee80211_local *local = hw_to_local(hw);
3190         struct ieee80211_sub_if_data *sdata;
3191         struct ieee80211_hdr *hdr;
3192         __le16 fc;
3193         struct ieee80211_rx_data rx;
3194         struct ieee80211_sub_if_data *prev;
3195         struct sta_info *sta, *tmp, *prev_sta;
3196         int err = 0;
3197
3198         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3199         memset(&rx, 0, sizeof(rx));
3200         rx.skb = skb;
3201         rx.local = local;
3202
3203         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3204                 local->dot11ReceivedFragmentCount++;
3205
3206         if (ieee80211_is_mgmt(fc)) {
3207                 /* drop frame if too short for header */
3208                 if (skb->len < ieee80211_hdrlen(fc))
3209                         err = -ENOBUFS;
3210                 else
3211                         err = skb_linearize(skb);
3212         } else {
3213                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3214         }
3215
3216         if (err) {
3217                 dev_kfree_skb(skb);
3218                 return;
3219         }
3220
3221         hdr = (struct ieee80211_hdr *)skb->data;
3222         ieee80211_parse_qos(&rx);
3223         ieee80211_verify_alignment(&rx);
3224
3225         if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3226                      ieee80211_is_beacon(hdr->frame_control)))
3227                 ieee80211_scan_rx(local, skb);
3228
3229         if (ieee80211_is_data(fc)) {
3230                 prev_sta = NULL;
3231
3232                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3233                         if (!prev_sta) {
3234                                 prev_sta = sta;
3235                                 continue;
3236                         }
3237
3238                         rx.sta = prev_sta;
3239                         rx.sdata = prev_sta->sdata;
3240                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
3241
3242                         prev_sta = sta;
3243                 }
3244
3245                 if (prev_sta) {
3246                         rx.sta = prev_sta;
3247                         rx.sdata = prev_sta->sdata;
3248
3249                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3250                                 return;
3251                         goto out;
3252                 }
3253         }
3254
3255         prev = NULL;
3256
3257         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3258                 if (!ieee80211_sdata_running(sdata))
3259                         continue;
3260
3261                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3262                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3263                         continue;
3264
3265                 /*
3266                  * frame is destined for this interface, but if it's
3267                  * not also for the previous one we handle that after
3268                  * the loop to avoid copying the SKB once too much
3269                  */
3270
3271                 if (!prev) {
3272                         prev = sdata;
3273                         continue;
3274                 }
3275
3276                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3277                 rx.sdata = prev;
3278                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3279
3280                 prev = sdata;
3281         }
3282
3283         if (prev) {
3284                 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3285                 rx.sdata = prev;
3286
3287                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3288                         return;
3289         }
3290
3291  out:
3292         dev_kfree_skb(skb);
3293 }
3294
3295 /*
3296  * This is the receive path handler. It is called by a low level driver when an
3297  * 802.11 MPDU is received from the hardware.
3298  */
3299 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3300 {
3301         struct ieee80211_local *local = hw_to_local(hw);
3302         struct ieee80211_rate *rate = NULL;
3303         struct ieee80211_supported_band *sband;
3304         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3305
3306         WARN_ON_ONCE(softirq_count() == 0);
3307
3308         if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3309                 goto drop;
3310
3311         sband = local->hw.wiphy->bands[status->band];
3312         if (WARN_ON(!sband))
3313                 goto drop;
3314
3315         /*
3316          * If we're suspending, it is possible although not too likely
3317          * that we'd be receiving frames after having already partially
3318          * quiesced the stack. We can't process such frames then since
3319          * that might, for example, cause stations to be added or other
3320          * driver callbacks be invoked.
3321          */
3322         if (unlikely(local->quiescing || local->suspended))
3323                 goto drop;
3324
3325         /* We might be during a HW reconfig, prevent Rx for the same reason */
3326         if (unlikely(local->in_reconfig))
3327                 goto drop;
3328
3329         /*
3330          * The same happens when we're not even started,
3331          * but that's worth a warning.
3332          */
3333         if (WARN_ON(!local->started))
3334                 goto drop;
3335
3336         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3337                 /*
3338                  * Validate the rate, unless a PLCP error means that
3339                  * we probably can't have a valid rate here anyway.
3340                  */
3341
3342                 if (status->flag & RX_FLAG_HT) {
3343                         /*
3344                          * rate_idx is MCS index, which can be [0-76]
3345                          * as documented on:
3346                          *
3347                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3348                          *
3349                          * Anything else would be some sort of driver or
3350                          * hardware error. The driver should catch hardware
3351                          * errors.
3352                          */
3353                         if (WARN(status->rate_idx > 76,
3354                                  "Rate marked as an HT rate but passed "
3355                                  "status->rate_idx is not "
3356                                  "an MCS index [0-76]: %d (0x%02x)\n",
3357                                  status->rate_idx,
3358                                  status->rate_idx))
3359                                 goto drop;
3360                 } else if (status->flag & RX_FLAG_VHT) {
3361                         if (WARN_ONCE(status->rate_idx > 9 ||
3362                                       !status->vht_nss ||
3363                                       status->vht_nss > 8,
3364                                       "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3365                                       status->rate_idx, status->vht_nss))
3366                                 goto drop;
3367                 } else {
3368                         if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3369                                 goto drop;
3370                         rate = &sband->bitrates[status->rate_idx];
3371                 }
3372         }
3373
3374         status->rx_flags = 0;
3375
3376         /*
3377          * key references and virtual interfaces are protected using RCU
3378          * and this requires that we are in a read-side RCU section during
3379          * receive processing
3380          */
3381         rcu_read_lock();
3382
3383         /*
3384          * Frames with failed FCS/PLCP checksum are not returned,
3385          * all other frames are returned without radiotap header
3386          * if it was previously present.
3387          * Also, frames with less than 16 bytes are dropped.
3388          */
3389         skb = ieee80211_rx_monitor(local, skb, rate);
3390         if (!skb) {
3391                 rcu_read_unlock();
3392                 return;
3393         }
3394
3395         ieee80211_tpt_led_trig_rx(local,
3396                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3397                         skb->len);
3398         __ieee80211_rx_handle_packet(hw, skb);
3399
3400         rcu_read_unlock();
3401
3402         return;
3403  drop:
3404         kfree_skb(skb);
3405 }
3406 EXPORT_SYMBOL(ieee80211_rx);
3407
3408 /* This is a version of the rx handler that can be called from hard irq
3409  * context. Post the skb on the queue and schedule the tasklet */
3410 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3411 {
3412         struct ieee80211_local *local = hw_to_local(hw);
3413
3414         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3415
3416         skb->pkt_type = IEEE80211_RX_MSG;
3417         skb_queue_tail(&local->skb_queue, skb);
3418         tasklet_schedule(&local->tasklet);
3419 }
3420 EXPORT_SYMBOL(ieee80211_rx_irqsafe);