mac80211: exit cooked monitor RX early if there are none
[linux-2.6.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 <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
24 #include "led.h"
25 #include "mesh.h"
26 #include "wep.h"
27 #include "wpa.h"
28 #include "tkip.h"
29 #include "wme.h"
30
31 /*
32  * monitor mode reception
33  *
34  * This function cleans up the SKB, i.e. it removes all the stuff
35  * only useful for monitoring.
36  */
37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
38                                            struct sk_buff *skb)
39 {
40         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41                 if (likely(skb->len > FCS_LEN))
42                         __pskb_trim(skb, skb->len - FCS_LEN);
43                 else {
44                         /* driver bug */
45                         WARN_ON(1);
46                         dev_kfree_skb(skb);
47                         skb = NULL;
48                 }
49         }
50
51         return skb;
52 }
53
54 static inline int should_drop_frame(struct sk_buff *skb,
55                                     int present_fcs_len)
56 {
57         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
58         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
59
60         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61                 return 1;
62         if (unlikely(skb->len < 16 + present_fcs_len))
63                 return 1;
64         if (ieee80211_is_ctl(hdr->frame_control) &&
65             !ieee80211_is_pspoll(hdr->frame_control) &&
66             !ieee80211_is_back_req(hdr->frame_control))
67                 return 1;
68         return 0;
69 }
70
71 static int
72 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73                           struct ieee80211_rx_status *status)
74 {
75         int len;
76
77         /* always present fields */
78         len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80         if (status->flag & RX_FLAG_MACTIME_MPDU)
81                 len += 8;
82         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
83                 len += 1;
84
85         if (len & 1) /* padding for RX_FLAGS if necessary */
86                 len++;
87
88         if (status->flag & RX_FLAG_HT) /* HT info */
89                 len += 3;
90
91         return len;
92 }
93
94 /*
95  * ieee80211_add_rx_radiotap_header - add radiotap header
96  *
97  * add a radiotap header containing all the fields which the hardware provided.
98  */
99 static void
100 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101                                  struct sk_buff *skb,
102                                  struct ieee80211_rate *rate,
103                                  int rtap_len)
104 {
105         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
106         struct ieee80211_radiotap_header *rthdr;
107         unsigned char *pos;
108         u16 rx_flags = 0;
109
110         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111         memset(rthdr, 0, rtap_len);
112
113         /* radiotap header, set always present flags */
114         rthdr->it_present =
115                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
116                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
117                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
118                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119         rthdr->it_len = cpu_to_le16(rtap_len);
120
121         pos = (unsigned char *)(rthdr+1);
122
123         /* the order of the following fields is important */
124
125         /* IEEE80211_RADIOTAP_TSFT */
126         if (status->flag & RX_FLAG_MACTIME_MPDU) {
127                 put_unaligned_le64(status->mactime, pos);
128                 rthdr->it_present |=
129                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130                 pos += 8;
131         }
132
133         /* IEEE80211_RADIOTAP_FLAGS */
134         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135                 *pos |= IEEE80211_RADIOTAP_F_FCS;
136         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
138         if (status->flag & RX_FLAG_SHORTPRE)
139                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
140         pos++;
141
142         /* IEEE80211_RADIOTAP_RATE */
143         if (status->flag & RX_FLAG_HT) {
144                 /*
145                  * MCS information is a separate field in radiotap,
146                  * added below. The byte here is needed as padding
147                  * for the channel though, so initialise it to 0.
148                  */
149                 *pos = 0;
150         } else {
151                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
152                 *pos = rate->bitrate / 5;
153         }
154         pos++;
155
156         /* IEEE80211_RADIOTAP_CHANNEL */
157         put_unaligned_le16(status->freq, pos);
158         pos += 2;
159         if (status->band == IEEE80211_BAND_5GHZ)
160                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161                                    pos);
162         else if (status->flag & RX_FLAG_HT)
163                 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164                                    pos);
165         else if (rate->flags & IEEE80211_RATE_ERP_G)
166                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167                                    pos);
168         else
169                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170                                    pos);
171         pos += 2;
172
173         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175                 *pos = status->signal;
176                 rthdr->it_present |=
177                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178                 pos++;
179         }
180
181         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183         /* IEEE80211_RADIOTAP_ANTENNA */
184         *pos = status->antenna;
185         pos++;
186
187         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189         /* IEEE80211_RADIOTAP_RX_FLAGS */
190         /* ensure 2 byte alignment for the 2 byte field as required */
191         if ((pos - (u8 *)rthdr) & 1)
192                 pos++;
193         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
194                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195         put_unaligned_le16(rx_flags, pos);
196         pos += 2;
197
198         if (status->flag & RX_FLAG_HT) {
199                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200                 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
202                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
203                 *pos = 0;
204                 if (status->flag & RX_FLAG_SHORT_GI)
205                         *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206                 if (status->flag & RX_FLAG_40MHZ)
207                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208                 pos++;
209                 *pos++ = status->rate_idx;
210         }
211 }
212
213 /*
214  * This function copies a received frame to all monitor interfaces and
215  * returns a cleaned-up SKB that no longer includes the FCS nor the
216  * radiotap header the driver might have added.
217  */
218 static struct sk_buff *
219 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
220                      struct ieee80211_rate *rate)
221 {
222         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
223         struct ieee80211_sub_if_data *sdata;
224         int needed_headroom = 0;
225         struct sk_buff *skb, *skb2;
226         struct net_device *prev_dev = NULL;
227         int present_fcs_len = 0;
228
229         /*
230          * First, we may need to make a copy of the skb because
231          *  (1) we need to modify it for radiotap (if not present), and
232          *  (2) the other RX handlers will modify the skb we got.
233          *
234          * We don't need to, of course, if we aren't going to return
235          * the SKB because it has a bad FCS/PLCP checksum.
236          */
237
238         /* room for the radiotap header based on driver features */
239         needed_headroom = ieee80211_rx_radiotap_len(local, status);
240
241         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242                 present_fcs_len = FCS_LEN;
243
244         /* make sure hdr->frame_control is on the linear part */
245         if (!pskb_may_pull(origskb, 2)) {
246                 dev_kfree_skb(origskb);
247                 return NULL;
248         }
249
250         if (!local->monitors) {
251                 if (should_drop_frame(origskb, present_fcs_len)) {
252                         dev_kfree_skb(origskb);
253                         return NULL;
254                 }
255
256                 return remove_monitor_info(local, origskb);
257         }
258
259         if (should_drop_frame(origskb, present_fcs_len)) {
260                 /* only need to expand headroom if necessary */
261                 skb = origskb;
262                 origskb = NULL;
263
264                 /*
265                  * This shouldn't trigger often because most devices have an
266                  * RX header they pull before we get here, and that should
267                  * be big enough for our radiotap information. We should
268                  * probably export the length to drivers so that we can have
269                  * them allocate enough headroom to start with.
270                  */
271                 if (skb_headroom(skb) < needed_headroom &&
272                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
273                         dev_kfree_skb(skb);
274                         return NULL;
275                 }
276         } else {
277                 /*
278                  * Need to make a copy and possibly remove radiotap header
279                  * and FCS from the original.
280                  */
281                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
283                 origskb = remove_monitor_info(local, origskb);
284
285                 if (!skb)
286                         return origskb;
287         }
288
289         /* prepend radiotap information */
290         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
291
292         skb_reset_mac_header(skb);
293         skb->ip_summed = CHECKSUM_UNNECESSARY;
294         skb->pkt_type = PACKET_OTHERHOST;
295         skb->protocol = htons(ETH_P_802_2);
296
297         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
298                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
299                         continue;
300
301                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302                         continue;
303
304                 if (!ieee80211_sdata_running(sdata))
305                         continue;
306
307                 if (prev_dev) {
308                         skb2 = skb_clone(skb, GFP_ATOMIC);
309                         if (skb2) {
310                                 skb2->dev = prev_dev;
311                                 netif_receive_skb(skb2);
312                         }
313                 }
314
315                 prev_dev = sdata->dev;
316                 sdata->dev->stats.rx_packets++;
317                 sdata->dev->stats.rx_bytes += skb->len;
318         }
319
320         if (prev_dev) {
321                 skb->dev = prev_dev;
322                 netif_receive_skb(skb);
323         } else
324                 dev_kfree_skb(skb);
325
326         return origskb;
327 }
328
329
330 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
331 {
332         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
333         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
334         int tid, seqno_idx, security_idx;
335
336         /* does the frame have a qos control field? */
337         if (ieee80211_is_data_qos(hdr->frame_control)) {
338                 u8 *qc = ieee80211_get_qos_ctl(hdr);
339                 /* frame has qos control */
340                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341                 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
342                         status->rx_flags |= IEEE80211_RX_AMSDU;
343
344                 seqno_idx = tid;
345                 security_idx = tid;
346         } else {
347                 /*
348                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349                  *
350                  *      Sequence numbers for management frames, QoS data
351                  *      frames with a broadcast/multicast address in the
352                  *      Address 1 field, and all non-QoS data frames sent
353                  *      by QoS STAs are assigned using an additional single
354                  *      modulo-4096 counter, [...]
355                  *
356                  * We also use that counter for non-QoS STAs.
357                  */
358                 seqno_idx = NUM_RX_DATA_QUEUES;
359                 security_idx = 0;
360                 if (ieee80211_is_mgmt(hdr->frame_control))
361                         security_idx = NUM_RX_DATA_QUEUES;
362                 tid = 0;
363         }
364
365         rx->seqno_idx = seqno_idx;
366         rx->security_idx = security_idx;
367         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
368          * For now, set skb->priority to 0 for other cases. */
369         rx->skb->priority = (tid > 7) ? 0 : tid;
370 }
371
372 /**
373  * DOC: Packet alignment
374  *
375  * Drivers always need to pass packets that are aligned to two-byte boundaries
376  * to the stack.
377  *
378  * Additionally, should, if possible, align the payload data in a way that
379  * guarantees that the contained IP header is aligned to a four-byte
380  * boundary. In the case of regular frames, this simply means aligning the
381  * payload to a four-byte boundary (because either the IP header is directly
382  * contained, or IV/RFC1042 headers that have a length divisible by four are
383  * in front of it).  If the payload data is not properly aligned and the
384  * architecture doesn't support efficient unaligned operations, mac80211
385  * will align the data.
386  *
387  * With A-MSDU frames, however, the payload data address must yield two modulo
388  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389  * push the IP header further back to a multiple of four again. Thankfully, the
390  * specs were sane enough this time around to require padding each A-MSDU
391  * subframe to a length that is a multiple of four.
392  *
393  * Padding like Atheros hardware adds which is between the 802.11 header and
394  * the payload is not supported, the driver is required to move the 802.11
395  * header to be directly in front of the payload in that case.
396  */
397 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
398 {
399 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
400         WARN_ONCE((unsigned long)rx->skb->data & 1,
401                   "unaligned packet at 0x%p\n", rx->skb->data);
402 #endif
403 }
404
405
406 /* rx handlers */
407
408 static ieee80211_rx_result debug_noinline
409 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
410 {
411         struct ieee80211_local *local = rx->local;
412         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
413         struct sk_buff *skb = rx->skb;
414
415         if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
416                    !local->sched_scanning))
417                 return RX_CONTINUE;
418
419         if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
420             test_bit(SCAN_SW_SCANNING, &local->scanning) ||
421             local->sched_scanning)
422                 return ieee80211_scan_rx(rx->sdata, skb);
423
424         /* scanning finished during invoking of handlers */
425         I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
426         return RX_DROP_UNUSABLE;
427 }
428
429
430 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431 {
432         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433
434         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435                 return 0;
436
437         return ieee80211_is_robust_mgmt_frame(hdr);
438 }
439
440
441 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
442 {
443         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
446                 return 0;
447
448         return ieee80211_is_robust_mgmt_frame(hdr);
449 }
450
451
452 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454 {
455         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
456         struct ieee80211_mmie *mmie;
457
458         if (skb->len < 24 + sizeof(*mmie) ||
459             !is_multicast_ether_addr(hdr->da))
460                 return -1;
461
462         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
463                 return -1; /* not a robust management frame */
464
465         mmie = (struct ieee80211_mmie *)
466                 (skb->data + skb->len - sizeof(*mmie));
467         if (mmie->element_id != WLAN_EID_MMIE ||
468             mmie->length != sizeof(*mmie) - 2)
469                 return -1;
470
471         return le16_to_cpu(mmie->key_id);
472 }
473
474
475 static ieee80211_rx_result
476 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
477 {
478         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
479         char *dev_addr = rx->sdata->vif.addr;
480
481         if (ieee80211_is_data(hdr->frame_control)) {
482                 if (is_multicast_ether_addr(hdr->addr1)) {
483                         if (ieee80211_has_tods(hdr->frame_control) ||
484                                 !ieee80211_has_fromds(hdr->frame_control))
485                                 return RX_DROP_MONITOR;
486                         if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
487                                 return RX_DROP_MONITOR;
488                 } else {
489                         if (!ieee80211_has_a4(hdr->frame_control))
490                                 return RX_DROP_MONITOR;
491                         if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
492                                 return RX_DROP_MONITOR;
493                 }
494         }
495
496         /* If there is not an established peer link and this is not a peer link
497          * establisment frame, beacon or probe, drop the frame.
498          */
499
500         if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
501                 struct ieee80211_mgmt *mgmt;
502
503                 if (!ieee80211_is_mgmt(hdr->frame_control))
504                         return RX_DROP_MONITOR;
505
506                 if (ieee80211_is_action(hdr->frame_control)) {
507                         u8 category;
508                         mgmt = (struct ieee80211_mgmt *)hdr;
509                         category = mgmt->u.action.category;
510                         if (category != WLAN_CATEGORY_MESH_ACTION &&
511                                 category != WLAN_CATEGORY_SELF_PROTECTED)
512                                 return RX_DROP_MONITOR;
513                         return RX_CONTINUE;
514                 }
515
516                 if (ieee80211_is_probe_req(hdr->frame_control) ||
517                     ieee80211_is_probe_resp(hdr->frame_control) ||
518                     ieee80211_is_beacon(hdr->frame_control) ||
519                     ieee80211_is_auth(hdr->frame_control))
520                         return RX_CONTINUE;
521
522                 return RX_DROP_MONITOR;
523
524         }
525
526         return RX_CONTINUE;
527 }
528
529 #define SEQ_MODULO 0x1000
530 #define SEQ_MASK   0xfff
531
532 static inline int seq_less(u16 sq1, u16 sq2)
533 {
534         return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
535 }
536
537 static inline u16 seq_inc(u16 sq)
538 {
539         return (sq + 1) & SEQ_MASK;
540 }
541
542 static inline u16 seq_sub(u16 sq1, u16 sq2)
543 {
544         return (sq1 - sq2) & SEQ_MASK;
545 }
546
547
548 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
549                                             struct tid_ampdu_rx *tid_agg_rx,
550                                             int index)
551 {
552         struct ieee80211_local *local = hw_to_local(hw);
553         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
554         struct ieee80211_rx_status *status;
555
556         lockdep_assert_held(&tid_agg_rx->reorder_lock);
557
558         if (!skb)
559                 goto no_frame;
560
561         /* release the frame from the reorder ring buffer */
562         tid_agg_rx->stored_mpdu_num--;
563         tid_agg_rx->reorder_buf[index] = NULL;
564         status = IEEE80211_SKB_RXCB(skb);
565         status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
566         skb_queue_tail(&local->rx_skb_queue, skb);
567
568 no_frame:
569         tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
570 }
571
572 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
573                                              struct tid_ampdu_rx *tid_agg_rx,
574                                              u16 head_seq_num)
575 {
576         int index;
577
578         lockdep_assert_held(&tid_agg_rx->reorder_lock);
579
580         while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
581                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
582                                                         tid_agg_rx->buf_size;
583                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
584         }
585 }
586
587 /*
588  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
589  * the skb was added to the buffer longer than this time ago, the earlier
590  * frames that have not yet been received are assumed to be lost and the skb
591  * can be released for processing. This may also release other skb's from the
592  * reorder buffer if there are no additional gaps between the frames.
593  *
594  * Callers must hold tid_agg_rx->reorder_lock.
595  */
596 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
597
598 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
599                                           struct tid_ampdu_rx *tid_agg_rx)
600 {
601         int index, j;
602
603         lockdep_assert_held(&tid_agg_rx->reorder_lock);
604
605         /* release the buffer until next missing frame */
606         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
607                                                 tid_agg_rx->buf_size;
608         if (!tid_agg_rx->reorder_buf[index] &&
609             tid_agg_rx->stored_mpdu_num > 1) {
610                 /*
611                  * No buffers ready to be released, but check whether any
612                  * frames in the reorder buffer have timed out.
613                  */
614                 int skipped = 1;
615                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
616                      j = (j + 1) % tid_agg_rx->buf_size) {
617                         if (!tid_agg_rx->reorder_buf[j]) {
618                                 skipped++;
619                                 continue;
620                         }
621                         if (skipped &&
622                             !time_after(jiffies, tid_agg_rx->reorder_time[j] +
623                                         HT_RX_REORDER_BUF_TIMEOUT))
624                                 goto set_release_timer;
625
626 #ifdef CONFIG_MAC80211_HT_DEBUG
627                         if (net_ratelimit())
628                                 wiphy_debug(hw->wiphy,
629                                             "release an RX reorder frame due to timeout on earlier frames\n");
630 #endif
631                         ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
632
633                         /*
634                          * Increment the head seq# also for the skipped slots.
635                          */
636                         tid_agg_rx->head_seq_num =
637                                 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
638                         skipped = 0;
639                 }
640         } else while (tid_agg_rx->reorder_buf[index]) {
641                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
642                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
643                                                         tid_agg_rx->buf_size;
644         }
645
646         if (tid_agg_rx->stored_mpdu_num) {
647                 j = index = seq_sub(tid_agg_rx->head_seq_num,
648                                     tid_agg_rx->ssn) % tid_agg_rx->buf_size;
649
650                 for (; j != (index - 1) % tid_agg_rx->buf_size;
651                      j = (j + 1) % tid_agg_rx->buf_size) {
652                         if (tid_agg_rx->reorder_buf[j])
653                                 break;
654                 }
655
656  set_release_timer:
657
658                 mod_timer(&tid_agg_rx->reorder_timer,
659                           tid_agg_rx->reorder_time[j] + 1 +
660                           HT_RX_REORDER_BUF_TIMEOUT);
661         } else {
662                 del_timer(&tid_agg_rx->reorder_timer);
663         }
664 }
665
666 /*
667  * As this function belongs to the RX path it must be under
668  * rcu_read_lock protection. It returns false if the frame
669  * can be processed immediately, true if it was consumed.
670  */
671 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
672                                              struct tid_ampdu_rx *tid_agg_rx,
673                                              struct sk_buff *skb)
674 {
675         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
676         u16 sc = le16_to_cpu(hdr->seq_ctrl);
677         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
678         u16 head_seq_num, buf_size;
679         int index;
680         bool ret = true;
681
682         spin_lock(&tid_agg_rx->reorder_lock);
683
684         buf_size = tid_agg_rx->buf_size;
685         head_seq_num = tid_agg_rx->head_seq_num;
686
687         /* frame with out of date sequence number */
688         if (seq_less(mpdu_seq_num, head_seq_num)) {
689                 dev_kfree_skb(skb);
690                 goto out;
691         }
692
693         /*
694          * If frame the sequence number exceeds our buffering window
695          * size release some previous frames to make room for this one.
696          */
697         if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
698                 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
699                 /* release stored frames up to new head to stack */
700                 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
701         }
702
703         /* Now the new frame is always in the range of the reordering buffer */
704
705         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
706
707         /* check if we already stored this frame */
708         if (tid_agg_rx->reorder_buf[index]) {
709                 dev_kfree_skb(skb);
710                 goto out;
711         }
712
713         /*
714          * If the current MPDU is in the right order and nothing else
715          * is stored we can process it directly, no need to buffer it.
716          * If it is first but there's something stored, we may be able
717          * to release frames after this one.
718          */
719         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720             tid_agg_rx->stored_mpdu_num == 0) {
721                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
722                 ret = false;
723                 goto out;
724         }
725
726         /* put the frame in the reordering buffer */
727         tid_agg_rx->reorder_buf[index] = skb;
728         tid_agg_rx->reorder_time[index] = jiffies;
729         tid_agg_rx->stored_mpdu_num++;
730         ieee80211_sta_reorder_release(hw, tid_agg_rx);
731
732  out:
733         spin_unlock(&tid_agg_rx->reorder_lock);
734         return ret;
735 }
736
737 /*
738  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739  * true if the MPDU was buffered, false if it should be processed.
740  */
741 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
742 {
743         struct sk_buff *skb = rx->skb;
744         struct ieee80211_local *local = rx->local;
745         struct ieee80211_hw *hw = &local->hw;
746         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
747         struct sta_info *sta = rx->sta;
748         struct tid_ampdu_rx *tid_agg_rx;
749         u16 sc;
750         int tid;
751
752         if (!ieee80211_is_data_qos(hdr->frame_control))
753                 goto dont_reorder;
754
755         /*
756          * filter the QoS data rx stream according to
757          * STA/TID and check if this STA/TID is on aggregation
758          */
759
760         if (!sta)
761                 goto dont_reorder;
762
763         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
764
765         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
766         if (!tid_agg_rx)
767                 goto dont_reorder;
768
769         /* qos null data frames are excluded */
770         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
771                 goto dont_reorder;
772
773         /* new, potentially un-ordered, ampdu frame - process it */
774
775         /* reset session timer */
776         if (tid_agg_rx->timeout)
777                 mod_timer(&tid_agg_rx->session_timer,
778                           TU_TO_EXP_TIME(tid_agg_rx->timeout));
779
780         /* if this mpdu is fragmented - terminate rx aggregation session */
781         sc = le16_to_cpu(hdr->seq_ctrl);
782         if (sc & IEEE80211_SCTL_FRAG) {
783                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
784                 skb_queue_tail(&rx->sdata->skb_queue, skb);
785                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
786                 return;
787         }
788
789         /*
790          * No locking needed -- we will only ever process one
791          * RX packet at a time, and thus own tid_agg_rx. All
792          * other code manipulating it needs to (and does) make
793          * sure that we cannot get to it any more before doing
794          * anything with it.
795          */
796         if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
797                 return;
798
799  dont_reorder:
800         skb_queue_tail(&local->rx_skb_queue, skb);
801 }
802
803 static ieee80211_rx_result debug_noinline
804 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
805 {
806         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
807         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
808
809         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
811                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
812                              rx->sta->last_seq_ctrl[rx->seqno_idx] ==
813                              hdr->seq_ctrl)) {
814                         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
815                                 rx->local->dot11FrameDuplicateCount++;
816                                 rx->sta->num_duplicates++;
817                         }
818                         return RX_DROP_UNUSABLE;
819                 } else
820                         rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
821         }
822
823         if (unlikely(rx->skb->len < 16)) {
824                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
825                 return RX_DROP_MONITOR;
826         }
827
828         /* Drop disallowed frame classes based on STA auth/assoc state;
829          * IEEE 802.11, Chap 5.5.
830          *
831          * mac80211 filters only based on association state, i.e. it drops
832          * Class 3 frames from not associated stations. hostapd sends
833          * deauth/disassoc frames when needed. In addition, hostapd is
834          * responsible for filtering on both auth and assoc states.
835          */
836
837         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
838                 return ieee80211_rx_mesh_check(rx);
839
840         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
841                       ieee80211_is_pspoll(hdr->frame_control)) &&
842                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
843                      rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
844                      (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
845                 if (rx->sta && rx->sta->dummy &&
846                     ieee80211_is_data_present(hdr->frame_control)) {
847                         u16 ethertype;
848                         u8 *payload;
849
850                         payload = rx->skb->data +
851                                 ieee80211_hdrlen(hdr->frame_control);
852                         ethertype = (payload[6] << 8) | payload[7];
853                         if (cpu_to_be16(ethertype) ==
854                             rx->sdata->control_port_protocol)
855                                 return RX_CONTINUE;
856                 }
857                 return RX_DROP_MONITOR;
858         }
859
860         return RX_CONTINUE;
861 }
862
863
864 static ieee80211_rx_result debug_noinline
865 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
866 {
867         struct sk_buff *skb = rx->skb;
868         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
869         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
870         int keyidx;
871         int hdrlen;
872         ieee80211_rx_result result = RX_DROP_UNUSABLE;
873         struct ieee80211_key *sta_ptk = NULL;
874         int mmie_keyidx = -1;
875         __le16 fc;
876
877         /*
878          * Key selection 101
879          *
880          * There are four types of keys:
881          *  - GTK (group keys)
882          *  - IGTK (group keys for management frames)
883          *  - PTK (pairwise keys)
884          *  - STK (station-to-station pairwise keys)
885          *
886          * When selecting a key, we have to distinguish between multicast
887          * (including broadcast) and unicast frames, the latter can only
888          * use PTKs and STKs while the former always use GTKs and IGTKs.
889          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
890          * unicast frames can also use key indices like GTKs. Hence, if we
891          * don't have a PTK/STK we check the key index for a WEP key.
892          *
893          * Note that in a regular BSS, multicast frames are sent by the
894          * AP only, associated stations unicast the frame to the AP first
895          * which then multicasts it on their behalf.
896          *
897          * There is also a slight problem in IBSS mode: GTKs are negotiated
898          * with each station, that is something we don't currently handle.
899          * The spec seems to expect that one negotiates the same key with
900          * every station but there's no such requirement; VLANs could be
901          * possible.
902          */
903
904         /*
905          * No point in finding a key and decrypting if the frame is neither
906          * addressed to us nor a multicast frame.
907          */
908         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
909                 return RX_CONTINUE;
910
911         /* start without a key */
912         rx->key = NULL;
913
914         if (rx->sta)
915                 sta_ptk = rcu_dereference(rx->sta->ptk);
916
917         fc = hdr->frame_control;
918
919         if (!ieee80211_has_protected(fc))
920                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
921
922         if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
923                 rx->key = sta_ptk;
924                 if ((status->flag & RX_FLAG_DECRYPTED) &&
925                     (status->flag & RX_FLAG_IV_STRIPPED))
926                         return RX_CONTINUE;
927                 /* Skip decryption if the frame is not protected. */
928                 if (!ieee80211_has_protected(fc))
929                         return RX_CONTINUE;
930         } else if (mmie_keyidx >= 0) {
931                 /* Broadcast/multicast robust management frame / BIP */
932                 if ((status->flag & RX_FLAG_DECRYPTED) &&
933                     (status->flag & RX_FLAG_IV_STRIPPED))
934                         return RX_CONTINUE;
935
936                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
937                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
938                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
939                 if (rx->sta)
940                         rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
941                 if (!rx->key)
942                         rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
943         } else if (!ieee80211_has_protected(fc)) {
944                 /*
945                  * The frame was not protected, so skip decryption. However, we
946                  * need to set rx->key if there is a key that could have been
947                  * used so that the frame may be dropped if encryption would
948                  * have been expected.
949                  */
950                 struct ieee80211_key *key = NULL;
951                 struct ieee80211_sub_if_data *sdata = rx->sdata;
952                 int i;
953
954                 if (ieee80211_is_mgmt(fc) &&
955                     is_multicast_ether_addr(hdr->addr1) &&
956                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
957                         rx->key = key;
958                 else {
959                         if (rx->sta) {
960                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
961                                         key = rcu_dereference(rx->sta->gtk[i]);
962                                         if (key)
963                                                 break;
964                                 }
965                         }
966                         if (!key) {
967                                 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
968                                         key = rcu_dereference(sdata->keys[i]);
969                                         if (key)
970                                                 break;
971                                 }
972                         }
973                         if (key)
974                                 rx->key = key;
975                 }
976                 return RX_CONTINUE;
977         } else {
978                 u8 keyid;
979                 /*
980                  * The device doesn't give us the IV so we won't be
981                  * able to look up the key. That's ok though, we
982                  * don't need to decrypt the frame, we just won't
983                  * be able to keep statistics accurate.
984                  * Except for key threshold notifications, should
985                  * we somehow allow the driver to tell us which key
986                  * the hardware used if this flag is set?
987                  */
988                 if ((status->flag & RX_FLAG_DECRYPTED) &&
989                     (status->flag & RX_FLAG_IV_STRIPPED))
990                         return RX_CONTINUE;
991
992                 hdrlen = ieee80211_hdrlen(fc);
993
994                 if (rx->skb->len < 8 + hdrlen)
995                         return RX_DROP_UNUSABLE; /* TODO: count this? */
996
997                 /*
998                  * no need to call ieee80211_wep_get_keyidx,
999                  * it verifies a bunch of things we've done already
1000                  */
1001                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1002                 keyidx = keyid >> 6;
1003
1004                 /* check per-station GTK first, if multicast packet */
1005                 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1006                         rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1007
1008                 /* if not found, try default key */
1009                 if (!rx->key) {
1010                         rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1011
1012                         /*
1013                          * RSNA-protected unicast frames should always be
1014                          * sent with pairwise or station-to-station keys,
1015                          * but for WEP we allow using a key index as well.
1016                          */
1017                         if (rx->key &&
1018                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1019                             rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1020                             !is_multicast_ether_addr(hdr->addr1))
1021                                 rx->key = NULL;
1022                 }
1023         }
1024
1025         if (rx->key) {
1026                 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1027                         return RX_DROP_MONITOR;
1028
1029                 rx->key->tx_rx_count++;
1030                 /* TODO: add threshold stuff again */
1031         } else {
1032                 return RX_DROP_MONITOR;
1033         }
1034
1035         if (skb_linearize(rx->skb))
1036                 return RX_DROP_UNUSABLE;
1037         /* the hdr variable is invalid now! */
1038
1039         switch (rx->key->conf.cipher) {
1040         case WLAN_CIPHER_SUITE_WEP40:
1041         case WLAN_CIPHER_SUITE_WEP104:
1042                 /* Check for weak IVs if possible */
1043                 if (rx->sta && ieee80211_is_data(fc) &&
1044                     (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1045                      !(status->flag & RX_FLAG_DECRYPTED)) &&
1046                     ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1047                         rx->sta->wep_weak_iv_count++;
1048
1049                 result = ieee80211_crypto_wep_decrypt(rx);
1050                 break;
1051         case WLAN_CIPHER_SUITE_TKIP:
1052                 result = ieee80211_crypto_tkip_decrypt(rx);
1053                 break;
1054         case WLAN_CIPHER_SUITE_CCMP:
1055                 result = ieee80211_crypto_ccmp_decrypt(rx);
1056                 break;
1057         case WLAN_CIPHER_SUITE_AES_CMAC:
1058                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1059                 break;
1060         default:
1061                 /*
1062                  * We can reach here only with HW-only algorithms
1063                  * but why didn't it decrypt the frame?!
1064                  */
1065                 return RX_DROP_UNUSABLE;
1066         }
1067
1068         /* either the frame has been decrypted or will be dropped */
1069         status->flag |= RX_FLAG_DECRYPTED;
1070
1071         return result;
1072 }
1073
1074 static ieee80211_rx_result debug_noinline
1075 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1076 {
1077         struct ieee80211_local *local;
1078         struct ieee80211_hdr *hdr;
1079         struct sk_buff *skb;
1080
1081         local = rx->local;
1082         skb = rx->skb;
1083         hdr = (struct ieee80211_hdr *) skb->data;
1084
1085         if (!local->pspolling)
1086                 return RX_CONTINUE;
1087
1088         if (!ieee80211_has_fromds(hdr->frame_control))
1089                 /* this is not from AP */
1090                 return RX_CONTINUE;
1091
1092         if (!ieee80211_is_data(hdr->frame_control))
1093                 return RX_CONTINUE;
1094
1095         if (!ieee80211_has_moredata(hdr->frame_control)) {
1096                 /* AP has no more frames buffered for us */
1097                 local->pspolling = false;
1098                 return RX_CONTINUE;
1099         }
1100
1101         /* more data bit is set, let's request a new frame from the AP */
1102         ieee80211_send_pspoll(local, rx->sdata);
1103
1104         return RX_CONTINUE;
1105 }
1106
1107 static void ap_sta_ps_start(struct sta_info *sta)
1108 {
1109         struct ieee80211_sub_if_data *sdata = sta->sdata;
1110         struct ieee80211_local *local = sdata->local;
1111
1112         atomic_inc(&sdata->bss->num_sta_ps);
1113         set_sta_flag(sta, WLAN_STA_PS_STA);
1114         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1115                 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1116 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1117         printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1118                sdata->name, sta->sta.addr, sta->sta.aid);
1119 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1120 }
1121
1122 static void ap_sta_ps_end(struct sta_info *sta)
1123 {
1124         struct ieee80211_sub_if_data *sdata = sta->sdata;
1125
1126         atomic_dec(&sdata->bss->num_sta_ps);
1127
1128 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1129         printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1130                sdata->name, sta->sta.addr, sta->sta.aid);
1131 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1132
1133         if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1134 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1135                 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1136                        sdata->name, sta->sta.addr, sta->sta.aid);
1137 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1138                 return;
1139         }
1140
1141         ieee80211_sta_ps_deliver_wakeup(sta);
1142 }
1143
1144 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1145 {
1146         struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1147         bool in_ps;
1148
1149         WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1150
1151         /* Don't let the same PS state be set twice */
1152         in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1153         if ((start && in_ps) || (!start && !in_ps))
1154                 return -EINVAL;
1155
1156         if (start)
1157                 ap_sta_ps_start(sta_inf);
1158         else
1159                 ap_sta_ps_end(sta_inf);
1160
1161         return 0;
1162 }
1163 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1164
1165 static ieee80211_rx_result debug_noinline
1166 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1167 {
1168         struct ieee80211_sub_if_data *sdata = rx->sdata;
1169         struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1170         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1171         int tid, ac;
1172
1173         if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1174                 return RX_CONTINUE;
1175
1176         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1177             sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1178                 return RX_CONTINUE;
1179
1180         /*
1181          * The device handles station powersave, so don't do anything about
1182          * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1183          * it to mac80211 since they're handled.)
1184          */
1185         if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1186                 return RX_CONTINUE;
1187
1188         /*
1189          * Don't do anything if the station isn't already asleep. In
1190          * the uAPSD case, the station will probably be marked asleep,
1191          * in the PS-Poll case the station must be confused ...
1192          */
1193         if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1194                 return RX_CONTINUE;
1195
1196         if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1197                 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1198                         if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1199                                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1200                         else
1201                                 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1202                 }
1203
1204                 /* Free PS Poll skb here instead of returning RX_DROP that would
1205                  * count as an dropped frame. */
1206                 dev_kfree_skb(rx->skb);
1207
1208                 return RX_QUEUED;
1209         } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1210                    !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1211                    ieee80211_has_pm(hdr->frame_control) &&
1212                    (ieee80211_is_data_qos(hdr->frame_control) ||
1213                     ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1214                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1215                 ac = ieee802_1d_to_ac[tid & 7];
1216
1217                 /*
1218                  * If this AC is not trigger-enabled do nothing.
1219                  *
1220                  * NB: This could/should check a separate bitmap of trigger-
1221                  * enabled queues, but for now we only implement uAPSD w/o
1222                  * TSPEC changes to the ACs, so they're always the same.
1223                  */
1224                 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1225                         return RX_CONTINUE;
1226
1227                 /* if we are in a service period, do nothing */
1228                 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1229                         return RX_CONTINUE;
1230
1231                 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1232                         ieee80211_sta_ps_deliver_uapsd(rx->sta);
1233                 else
1234                         set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1235         }
1236
1237         return RX_CONTINUE;
1238 }
1239
1240 static ieee80211_rx_result debug_noinline
1241 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1242 {
1243         struct sta_info *sta = rx->sta;
1244         struct sk_buff *skb = rx->skb;
1245         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1246         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1247
1248         if (!sta)
1249                 return RX_CONTINUE;
1250
1251         /*
1252          * Update last_rx only for IBSS packets which are for the current
1253          * BSSID to avoid keeping the current IBSS network alive in cases
1254          * where other STAs start using different BSSID.
1255          */
1256         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1257                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1258                                                 NL80211_IFTYPE_ADHOC);
1259                 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1260                         sta->last_rx = jiffies;
1261                         if (ieee80211_is_data(hdr->frame_control)) {
1262                                 sta->last_rx_rate_idx = status->rate_idx;
1263                                 sta->last_rx_rate_flag = status->flag;
1264                         }
1265                 }
1266         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1267                 /*
1268                  * Mesh beacons will update last_rx when if they are found to
1269                  * match the current local configuration when processed.
1270                  */
1271                 sta->last_rx = jiffies;
1272                 if (ieee80211_is_data(hdr->frame_control)) {
1273                         sta->last_rx_rate_idx = status->rate_idx;
1274                         sta->last_rx_rate_flag = status->flag;
1275                 }
1276         }
1277
1278         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1279                 return RX_CONTINUE;
1280
1281         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1282                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1283
1284         sta->rx_fragments++;
1285         sta->rx_bytes += rx->skb->len;
1286         sta->last_signal = status->signal;
1287         ewma_add(&sta->avg_signal, -status->signal);
1288
1289         /*
1290          * Change STA power saving mode only at the end of a frame
1291          * exchange sequence.
1292          */
1293         if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1294             !ieee80211_has_morefrags(hdr->frame_control) &&
1295             !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1296             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1297              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1298                 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1299                         /*
1300                          * Ignore doze->wake transitions that are
1301                          * indicated by non-data frames, the standard
1302                          * is unclear here, but for example going to
1303                          * PS mode and then scanning would cause a
1304                          * doze->wake transition for the probe request,
1305                          * and that is clearly undesirable.
1306                          */
1307                         if (ieee80211_is_data(hdr->frame_control) &&
1308                             !ieee80211_has_pm(hdr->frame_control))
1309                                 ap_sta_ps_end(sta);
1310                 } else {
1311                         if (ieee80211_has_pm(hdr->frame_control))
1312                                 ap_sta_ps_start(sta);
1313                 }
1314         }
1315
1316         /*
1317          * Drop (qos-)data::nullfunc frames silently, since they
1318          * are used only to control station power saving mode.
1319          */
1320         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1321             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1322                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1323
1324                 /*
1325                  * If we receive a 4-addr nullfunc frame from a STA
1326                  * that was not moved to a 4-addr STA vlan yet, drop
1327                  * the frame to the monitor interface, to make sure
1328                  * that hostapd sees it
1329                  */
1330                 if (ieee80211_has_a4(hdr->frame_control) &&
1331                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1332                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1333                       !rx->sdata->u.vlan.sta)))
1334                         return RX_DROP_MONITOR;
1335                 /*
1336                  * Update counter and free packet here to avoid
1337                  * counting this as a dropped packed.
1338                  */
1339                 sta->rx_packets++;
1340                 dev_kfree_skb(rx->skb);
1341                 return RX_QUEUED;
1342         }
1343
1344         return RX_CONTINUE;
1345 } /* ieee80211_rx_h_sta_process */
1346
1347 static inline struct ieee80211_fragment_entry *
1348 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1349                          unsigned int frag, unsigned int seq, int rx_queue,
1350                          struct sk_buff **skb)
1351 {
1352         struct ieee80211_fragment_entry *entry;
1353         int idx;
1354
1355         idx = sdata->fragment_next;
1356         entry = &sdata->fragments[sdata->fragment_next++];
1357         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1358                 sdata->fragment_next = 0;
1359
1360         if (!skb_queue_empty(&entry->skb_list)) {
1361 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1362                 struct ieee80211_hdr *hdr =
1363                         (struct ieee80211_hdr *) entry->skb_list.next->data;
1364                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1365                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1366                        "addr1=%pM addr2=%pM\n",
1367                        sdata->name, idx,
1368                        jiffies - entry->first_frag_time, entry->seq,
1369                        entry->last_frag, hdr->addr1, hdr->addr2);
1370 #endif
1371                 __skb_queue_purge(&entry->skb_list);
1372         }
1373
1374         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1375         *skb = NULL;
1376         entry->first_frag_time = jiffies;
1377         entry->seq = seq;
1378         entry->rx_queue = rx_queue;
1379         entry->last_frag = frag;
1380         entry->ccmp = 0;
1381         entry->extra_len = 0;
1382
1383         return entry;
1384 }
1385
1386 static inline struct ieee80211_fragment_entry *
1387 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1388                           unsigned int frag, unsigned int seq,
1389                           int rx_queue, struct ieee80211_hdr *hdr)
1390 {
1391         struct ieee80211_fragment_entry *entry;
1392         int i, idx;
1393
1394         idx = sdata->fragment_next;
1395         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1396                 struct ieee80211_hdr *f_hdr;
1397
1398                 idx--;
1399                 if (idx < 0)
1400                         idx = IEEE80211_FRAGMENT_MAX - 1;
1401
1402                 entry = &sdata->fragments[idx];
1403                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1404                     entry->rx_queue != rx_queue ||
1405                     entry->last_frag + 1 != frag)
1406                         continue;
1407
1408                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1409
1410                 /*
1411                  * Check ftype and addresses are equal, else check next fragment
1412                  */
1413                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1414                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1415                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1416                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1417                         continue;
1418
1419                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1420                         __skb_queue_purge(&entry->skb_list);
1421                         continue;
1422                 }
1423                 return entry;
1424         }
1425
1426         return NULL;
1427 }
1428
1429 static ieee80211_rx_result debug_noinline
1430 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1431 {
1432         struct ieee80211_hdr *hdr;
1433         u16 sc;
1434         __le16 fc;
1435         unsigned int frag, seq;
1436         struct ieee80211_fragment_entry *entry;
1437         struct sk_buff *skb;
1438         struct ieee80211_rx_status *status;
1439
1440         hdr = (struct ieee80211_hdr *)rx->skb->data;
1441         fc = hdr->frame_control;
1442         sc = le16_to_cpu(hdr->seq_ctrl);
1443         frag = sc & IEEE80211_SCTL_FRAG;
1444
1445         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1446                    (rx->skb)->len < 24 ||
1447                    is_multicast_ether_addr(hdr->addr1))) {
1448                 /* not fragmented */
1449                 goto out;
1450         }
1451         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1452
1453         if (skb_linearize(rx->skb))
1454                 return RX_DROP_UNUSABLE;
1455
1456         /*
1457          *  skb_linearize() might change the skb->data and
1458          *  previously cached variables (in this case, hdr) need to
1459          *  be refreshed with the new data.
1460          */
1461         hdr = (struct ieee80211_hdr *)rx->skb->data;
1462         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1463
1464         if (frag == 0) {
1465                 /* This is the first fragment of a new frame. */
1466                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1467                                                  rx->seqno_idx, &(rx->skb));
1468                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1469                     ieee80211_has_protected(fc)) {
1470                         int queue = rx->security_idx;
1471                         /* Store CCMP PN so that we can verify that the next
1472                          * fragment has a sequential PN value. */
1473                         entry->ccmp = 1;
1474                         memcpy(entry->last_pn,
1475                                rx->key->u.ccmp.rx_pn[queue],
1476                                CCMP_PN_LEN);
1477                 }
1478                 return RX_QUEUED;
1479         }
1480
1481         /* This is a fragment for a frame that should already be pending in
1482          * fragment cache. Add this fragment to the end of the pending entry.
1483          */
1484         entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1485                                           rx->seqno_idx, hdr);
1486         if (!entry) {
1487                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1488                 return RX_DROP_MONITOR;
1489         }
1490
1491         /* Verify that MPDUs within one MSDU have sequential PN values.
1492          * (IEEE 802.11i, 8.3.3.4.5) */
1493         if (entry->ccmp) {
1494                 int i;
1495                 u8 pn[CCMP_PN_LEN], *rpn;
1496                 int queue;
1497                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1498                         return RX_DROP_UNUSABLE;
1499                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1500                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1501                         pn[i]++;
1502                         if (pn[i])
1503                                 break;
1504                 }
1505                 queue = rx->security_idx;
1506                 rpn = rx->key->u.ccmp.rx_pn[queue];
1507                 if (memcmp(pn, rpn, CCMP_PN_LEN))
1508                         return RX_DROP_UNUSABLE;
1509                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1510         }
1511
1512         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1513         __skb_queue_tail(&entry->skb_list, rx->skb);
1514         entry->last_frag = frag;
1515         entry->extra_len += rx->skb->len;
1516         if (ieee80211_has_morefrags(fc)) {
1517                 rx->skb = NULL;
1518                 return RX_QUEUED;
1519         }
1520
1521         rx->skb = __skb_dequeue(&entry->skb_list);
1522         if (skb_tailroom(rx->skb) < entry->extra_len) {
1523                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1524                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1525                                               GFP_ATOMIC))) {
1526                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1527                         __skb_queue_purge(&entry->skb_list);
1528                         return RX_DROP_UNUSABLE;
1529                 }
1530         }
1531         while ((skb = __skb_dequeue(&entry->skb_list))) {
1532                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1533                 dev_kfree_skb(skb);
1534         }
1535
1536         /* Complete frame has been reassembled - process it now */
1537         status = IEEE80211_SKB_RXCB(rx->skb);
1538         status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1539
1540  out:
1541         if (rx->sta)
1542                 rx->sta->rx_packets++;
1543         if (is_multicast_ether_addr(hdr->addr1))
1544                 rx->local->dot11MulticastReceivedFrameCount++;
1545         else
1546                 ieee80211_led_rx(rx->local);
1547         return RX_CONTINUE;
1548 }
1549
1550 static ieee80211_rx_result debug_noinline
1551 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1552 {
1553         u8 *data = rx->skb->data;
1554         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1555
1556         if (!ieee80211_is_data_qos(hdr->frame_control))
1557                 return RX_CONTINUE;
1558
1559         /* remove the qos control field, update frame type and meta-data */
1560         memmove(data + IEEE80211_QOS_CTL_LEN, data,
1561                 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1562         hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1563         /* change frame type to non QOS */
1564         hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1565
1566         return RX_CONTINUE;
1567 }
1568
1569 static int
1570 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1571 {
1572         if (unlikely(!rx->sta ||
1573             !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1574                 return -EACCES;
1575
1576         return 0;
1577 }
1578
1579 static int
1580 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1581 {
1582         struct sk_buff *skb = rx->skb;
1583         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1584
1585         /*
1586          * Pass through unencrypted frames if the hardware has
1587          * decrypted them already.
1588          */
1589         if (status->flag & RX_FLAG_DECRYPTED)
1590                 return 0;
1591
1592         /* Drop unencrypted frames if key is set. */
1593         if (unlikely(!ieee80211_has_protected(fc) &&
1594                      !ieee80211_is_nullfunc(fc) &&
1595                      ieee80211_is_data(fc) &&
1596                      (rx->key || rx->sdata->drop_unencrypted)))
1597                 return -EACCES;
1598
1599         return 0;
1600 }
1601
1602 static int
1603 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1604 {
1605         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1606         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1607         __le16 fc = hdr->frame_control;
1608
1609         /*
1610          * Pass through unencrypted frames if the hardware has
1611          * decrypted them already.
1612          */
1613         if (status->flag & RX_FLAG_DECRYPTED)
1614                 return 0;
1615
1616         if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1617                 if (unlikely(!ieee80211_has_protected(fc) &&
1618                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1619                              rx->key)) {
1620                         if (ieee80211_is_deauth(fc))
1621                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1622                                                             rx->skb->data,
1623                                                             rx->skb->len);
1624                         else if (ieee80211_is_disassoc(fc))
1625                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1626                                                               rx->skb->data,
1627                                                               rx->skb->len);
1628                         return -EACCES;
1629                 }
1630                 /* BIP does not use Protected field, so need to check MMIE */
1631                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1632                              ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1633                         if (ieee80211_is_deauth(fc))
1634                                 cfg80211_send_unprot_deauth(rx->sdata->dev,
1635                                                             rx->skb->data,
1636                                                             rx->skb->len);
1637                         else if (ieee80211_is_disassoc(fc))
1638                                 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1639                                                               rx->skb->data,
1640                                                               rx->skb->len);
1641                         return -EACCES;
1642                 }
1643                 /*
1644                  * When using MFP, Action frames are not allowed prior to
1645                  * having configured keys.
1646                  */
1647                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1648                              ieee80211_is_robust_mgmt_frame(
1649                                      (struct ieee80211_hdr *) rx->skb->data)))
1650                         return -EACCES;
1651         }
1652
1653         return 0;
1654 }
1655
1656 static int
1657 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1658 {
1659         struct ieee80211_sub_if_data *sdata = rx->sdata;
1660         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1661         bool check_port_control = false;
1662         struct ethhdr *ehdr;
1663         int ret;
1664
1665         *port_control = false;
1666         if (ieee80211_has_a4(hdr->frame_control) &&
1667             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1668                 return -1;
1669
1670         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1671             !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1672
1673                 if (!sdata->u.mgd.use_4addr)
1674                         return -1;
1675                 else
1676                         check_port_control = true;
1677         }
1678
1679         if (is_multicast_ether_addr(hdr->addr1) &&
1680             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1681                 return -1;
1682
1683         ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1684         if (ret < 0)
1685                 return ret;
1686
1687         ehdr = (struct ethhdr *) rx->skb->data;
1688         if (ehdr->h_proto == rx->sdata->control_port_protocol)
1689                 *port_control = true;
1690         else if (check_port_control)
1691                 return -1;
1692
1693         return 0;
1694 }
1695
1696 /*
1697  * requires that rx->skb is a frame with ethernet header
1698  */
1699 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1700 {
1701         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1702                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1703         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1704
1705         /*
1706          * Allow EAPOL frames to us/the PAE group address regardless
1707          * of whether the frame was encrypted or not.
1708          */
1709         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1710             (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1711              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1712                 return true;
1713
1714         if (ieee80211_802_1x_port_control(rx) ||
1715             ieee80211_drop_unencrypted(rx, fc))
1716                 return false;
1717
1718         return true;
1719 }
1720
1721 /*
1722  * requires that rx->skb is a frame with ethernet header
1723  */
1724 static void
1725 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1726 {
1727         struct ieee80211_sub_if_data *sdata = rx->sdata;
1728         struct net_device *dev = sdata->dev;
1729         struct sk_buff *skb, *xmit_skb;
1730         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1731         struct sta_info *dsta;
1732         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1733
1734         skb = rx->skb;
1735         xmit_skb = NULL;
1736
1737         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1738              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1739             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1740             (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1741             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1742                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1743                         /*
1744                          * send multicast frames both to higher layers in
1745                          * local net stack and back to the wireless medium
1746                          */
1747                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1748                         if (!xmit_skb && net_ratelimit())
1749                                 printk(KERN_DEBUG "%s: failed to clone "
1750                                        "multicast frame\n", dev->name);
1751                 } else {
1752                         dsta = sta_info_get(sdata, skb->data);
1753                         if (dsta) {
1754                                 /*
1755                                  * The destination station is associated to
1756                                  * this AP (in this VLAN), so send the frame
1757                                  * directly to it and do not pass it to local
1758                                  * net stack.
1759                                  */
1760                                 xmit_skb = skb;
1761                                 skb = NULL;
1762                         }
1763                 }
1764         }
1765
1766         if (skb) {
1767                 int align __maybe_unused;
1768
1769 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1770                 /*
1771                  * 'align' will only take the values 0 or 2 here
1772                  * since all frames are required to be aligned
1773                  * to 2-byte boundaries when being passed to
1774                  * mac80211. That also explains the __skb_push()
1775                  * below.
1776                  */
1777                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1778                 if (align) {
1779                         if (WARN_ON(skb_headroom(skb) < 3)) {
1780                                 dev_kfree_skb(skb);
1781                                 skb = NULL;
1782                         } else {
1783                                 u8 *data = skb->data;
1784                                 size_t len = skb_headlen(skb);
1785                                 skb->data -= align;
1786                                 memmove(skb->data, data, len);
1787                                 skb_set_tail_pointer(skb, len);
1788                         }
1789                 }
1790 #endif
1791
1792                 if (skb) {
1793                         /* deliver to local stack */
1794                         skb->protocol = eth_type_trans(skb, dev);
1795                         memset(skb->cb, 0, sizeof(skb->cb));
1796                         netif_receive_skb(skb);
1797                 }
1798         }
1799
1800         if (xmit_skb) {
1801                 /* send to wireless media */
1802                 xmit_skb->protocol = htons(ETH_P_802_3);
1803                 skb_reset_network_header(xmit_skb);
1804                 skb_reset_mac_header(xmit_skb);
1805                 dev_queue_xmit(xmit_skb);
1806         }
1807 }
1808
1809 static ieee80211_rx_result debug_noinline
1810 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1811 {
1812         struct net_device *dev = rx->sdata->dev;
1813         struct sk_buff *skb = rx->skb;
1814         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1815         __le16 fc = hdr->frame_control;
1816         struct sk_buff_head frame_list;
1817         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1818
1819         if (unlikely(!ieee80211_is_data(fc)))
1820                 return RX_CONTINUE;
1821
1822         if (unlikely(!ieee80211_is_data_present(fc)))
1823                 return RX_DROP_MONITOR;
1824
1825         if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1826                 return RX_CONTINUE;
1827
1828         if (ieee80211_has_a4(hdr->frame_control) &&
1829             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1830             !rx->sdata->u.vlan.sta)
1831                 return RX_DROP_UNUSABLE;
1832
1833         if (is_multicast_ether_addr(hdr->addr1) &&
1834             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1835               rx->sdata->u.vlan.sta) ||
1836              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1837               rx->sdata->u.mgd.use_4addr)))
1838                 return RX_DROP_UNUSABLE;
1839
1840         skb->dev = dev;
1841         __skb_queue_head_init(&frame_list);
1842
1843         if (skb_linearize(skb))
1844                 return RX_DROP_UNUSABLE;
1845
1846         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1847                                  rx->sdata->vif.type,
1848                                  rx->local->hw.extra_tx_headroom, true);
1849
1850         while (!skb_queue_empty(&frame_list)) {
1851                 rx->skb = __skb_dequeue(&frame_list);
1852
1853                 if (!ieee80211_frame_allowed(rx, fc)) {
1854                         dev_kfree_skb(rx->skb);
1855                         continue;
1856                 }
1857                 dev->stats.rx_packets++;
1858                 dev->stats.rx_bytes += rx->skb->len;
1859
1860                 ieee80211_deliver_skb(rx);
1861         }
1862
1863         return RX_QUEUED;
1864 }
1865
1866 #ifdef CONFIG_MAC80211_MESH
1867 static ieee80211_rx_result
1868 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1869 {
1870         struct ieee80211_hdr *hdr;
1871         struct ieee80211s_hdr *mesh_hdr;
1872         unsigned int hdrlen;
1873         struct sk_buff *skb = rx->skb, *fwd_skb;
1874         struct ieee80211_local *local = rx->local;
1875         struct ieee80211_sub_if_data *sdata = rx->sdata;
1876         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1877
1878         hdr = (struct ieee80211_hdr *) skb->data;
1879         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1880         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1881
1882         /* frame is in RMC, don't forward */
1883         if (ieee80211_is_data(hdr->frame_control) &&
1884             is_multicast_ether_addr(hdr->addr1) &&
1885             mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1886                 return RX_DROP_MONITOR;
1887
1888         if (!ieee80211_is_data(hdr->frame_control))
1889                 return RX_CONTINUE;
1890
1891         if (!mesh_hdr->ttl)
1892                 /* illegal frame */
1893                 return RX_DROP_MONITOR;
1894
1895         if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1896                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1897                                                 dropped_frames_congestion);
1898                 return RX_DROP_MONITOR;
1899         }
1900
1901         if (mesh_hdr->flags & MESH_FLAGS_AE) {
1902                 struct mesh_path *mppath;
1903                 char *proxied_addr;
1904                 char *mpp_addr;
1905
1906                 if (is_multicast_ether_addr(hdr->addr1)) {
1907                         mpp_addr = hdr->addr3;
1908                         proxied_addr = mesh_hdr->eaddr1;
1909                 } else {
1910                         mpp_addr = hdr->addr4;
1911                         proxied_addr = mesh_hdr->eaddr2;
1912                 }
1913
1914                 rcu_read_lock();
1915                 mppath = mpp_path_lookup(proxied_addr, sdata);
1916                 if (!mppath) {
1917                         mpp_path_add(proxied_addr, mpp_addr, sdata);
1918                 } else {
1919                         spin_lock_bh(&mppath->state_lock);
1920                         if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1921                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1922                         spin_unlock_bh(&mppath->state_lock);
1923                 }
1924                 rcu_read_unlock();
1925         }
1926
1927         /* Frame has reached destination.  Don't forward */
1928         if (!is_multicast_ether_addr(hdr->addr1) &&
1929             compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1930                 return RX_CONTINUE;
1931
1932         mesh_hdr->ttl--;
1933
1934         if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1935                 if (!mesh_hdr->ttl)
1936                         IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1937                                                      dropped_frames_ttl);
1938                 else {
1939                         struct ieee80211_hdr *fwd_hdr;
1940                         struct ieee80211_tx_info *info;
1941
1942                         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1943
1944                         if (!fwd_skb && net_ratelimit())
1945                                 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1946                                                    sdata->name);
1947                         if (!fwd_skb)
1948                                 goto out;
1949
1950                         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1951                         memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1952                         info = IEEE80211_SKB_CB(fwd_skb);
1953                         memset(info, 0, sizeof(*info));
1954                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1955                         info->control.vif = &rx->sdata->vif;
1956                         if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1957                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1958                                                                 fwded_mcast);
1959                                 skb_set_queue_mapping(fwd_skb,
1960                                         ieee80211_select_queue(sdata, fwd_skb));
1961                                 ieee80211_set_qos_hdr(sdata, fwd_skb);
1962                         } else {
1963                                 int err;
1964                                 /*
1965                                  * Save TA to addr1 to send TA a path error if a
1966                                  * suitable next hop is not found
1967                                  */
1968                                 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1969                                                 ETH_ALEN);
1970                                 err = mesh_nexthop_lookup(fwd_skb, sdata);
1971                                 /* Failed to immediately resolve next hop:
1972                                  * fwded frame was dropped or will be added
1973                                  * later to the pending skb queue.  */
1974                                 if (err)
1975                                         return RX_DROP_MONITOR;
1976
1977                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1978                                                                 fwded_unicast);
1979                         }
1980                         IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1981                                                      fwded_frames);
1982                         ieee80211_add_pending_skb(local, fwd_skb);
1983                 }
1984         }
1985
1986  out:
1987         if (is_multicast_ether_addr(hdr->addr1) ||
1988             sdata->dev->flags & IFF_PROMISC)
1989                 return RX_CONTINUE;
1990         else
1991                 return RX_DROP_MONITOR;
1992 }
1993 #endif
1994
1995 static ieee80211_rx_result debug_noinline
1996 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1997 {
1998         struct ieee80211_sub_if_data *sdata = rx->sdata;
1999         struct ieee80211_local *local = rx->local;
2000         struct net_device *dev = sdata->dev;
2001         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2002         __le16 fc = hdr->frame_control;
2003         bool port_control;
2004         int err;
2005
2006         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2007                 return RX_CONTINUE;
2008
2009         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2010                 return RX_DROP_MONITOR;
2011
2012         /*
2013          * Allow the cooked monitor interface of an AP to see 4-addr frames so
2014          * that a 4-addr station can be detected and moved into a separate VLAN
2015          */
2016         if (ieee80211_has_a4(hdr->frame_control) &&
2017             sdata->vif.type == NL80211_IFTYPE_AP)
2018                 return RX_DROP_MONITOR;
2019
2020         err = __ieee80211_data_to_8023(rx, &port_control);
2021         if (unlikely(err))
2022                 return RX_DROP_UNUSABLE;
2023
2024         if (!ieee80211_frame_allowed(rx, fc))
2025                 return RX_DROP_MONITOR;
2026
2027         if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2028             unlikely(port_control) && sdata->bss) {
2029                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2030                                      u.ap);
2031                 dev = sdata->dev;
2032                 rx->sdata = sdata;
2033         }
2034
2035         rx->skb->dev = dev;
2036
2037         dev->stats.rx_packets++;
2038         dev->stats.rx_bytes += rx->skb->len;
2039
2040         if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2041             !is_multicast_ether_addr(
2042                     ((struct ethhdr *)rx->skb->data)->h_dest) &&
2043             (!local->scanning &&
2044              !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2045                         mod_timer(&local->dynamic_ps_timer, jiffies +
2046                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2047         }
2048
2049         ieee80211_deliver_skb(rx);
2050
2051         return RX_QUEUED;
2052 }
2053
2054 static ieee80211_rx_result debug_noinline
2055 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2056 {
2057         struct ieee80211_local *local = rx->local;
2058         struct ieee80211_hw *hw = &local->hw;
2059         struct sk_buff *skb = rx->skb;
2060         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2061         struct tid_ampdu_rx *tid_agg_rx;
2062         u16 start_seq_num;
2063         u16 tid;
2064
2065         if (likely(!ieee80211_is_ctl(bar->frame_control)))
2066                 return RX_CONTINUE;
2067
2068         if (ieee80211_is_back_req(bar->frame_control)) {
2069                 struct {
2070                         __le16 control, start_seq_num;
2071                 } __packed bar_data;
2072
2073                 if (!rx->sta)
2074                         return RX_DROP_MONITOR;
2075
2076                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2077                                   &bar_data, sizeof(bar_data)))
2078                         return RX_DROP_MONITOR;
2079
2080                 tid = le16_to_cpu(bar_data.control) >> 12;
2081
2082                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2083                 if (!tid_agg_rx)
2084                         return RX_DROP_MONITOR;
2085
2086                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2087
2088                 /* reset session timer */
2089                 if (tid_agg_rx->timeout)
2090                         mod_timer(&tid_agg_rx->session_timer,
2091                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
2092
2093                 spin_lock(&tid_agg_rx->reorder_lock);
2094                 /* release stored frames up to start of BAR */
2095                 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2096                 spin_unlock(&tid_agg_rx->reorder_lock);
2097
2098                 kfree_skb(skb);
2099                 return RX_QUEUED;
2100         }
2101
2102         /*
2103          * After this point, we only want management frames,
2104          * so we can drop all remaining control frames to
2105          * cooked monitor interfaces.
2106          */
2107         return RX_DROP_MONITOR;
2108 }
2109
2110 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2111                                            struct ieee80211_mgmt *mgmt,
2112                                            size_t len)
2113 {
2114         struct ieee80211_local *local = sdata->local;
2115         struct sk_buff *skb;
2116         struct ieee80211_mgmt *resp;
2117
2118         if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2119                 /* Not to own unicast address */
2120                 return;
2121         }
2122
2123         if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2124             compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2125                 /* Not from the current AP or not associated yet. */
2126                 return;
2127         }
2128
2129         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2130                 /* Too short SA Query request frame */
2131                 return;
2132         }
2133
2134         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2135         if (skb == NULL)
2136                 return;
2137
2138         skb_reserve(skb, local->hw.extra_tx_headroom);
2139         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2140         memset(resp, 0, 24);
2141         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2142         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2143         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2144         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2145                                           IEEE80211_STYPE_ACTION);
2146         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2147         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2148         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2149         memcpy(resp->u.action.u.sa_query.trans_id,
2150                mgmt->u.action.u.sa_query.trans_id,
2151                WLAN_SA_QUERY_TR_ID_LEN);
2152
2153         ieee80211_tx_skb(sdata, skb);
2154 }
2155
2156 static ieee80211_rx_result debug_noinline
2157 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2158 {
2159         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2160         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2161
2162         /*
2163          * From here on, look only at management frames.
2164          * Data and control frames are already handled,
2165          * and unknown (reserved) frames are useless.
2166          */
2167         if (rx->skb->len < 24)
2168                 return RX_DROP_MONITOR;
2169
2170         if (!ieee80211_is_mgmt(mgmt->frame_control))
2171                 return RX_DROP_MONITOR;
2172
2173         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2174                 return RX_DROP_MONITOR;
2175
2176         if (ieee80211_drop_unencrypted_mgmt(rx))
2177                 return RX_DROP_UNUSABLE;
2178
2179         return RX_CONTINUE;
2180 }
2181
2182 static ieee80211_rx_result debug_noinline
2183 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2184 {
2185         struct ieee80211_local *local = rx->local;
2186         struct ieee80211_sub_if_data *sdata = rx->sdata;
2187         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2188         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2189         int len = rx->skb->len;
2190
2191         if (!ieee80211_is_action(mgmt->frame_control))
2192                 return RX_CONTINUE;
2193
2194         /* drop too small frames */
2195         if (len < IEEE80211_MIN_ACTION_SIZE)
2196                 return RX_DROP_UNUSABLE;
2197
2198         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2199                 return RX_DROP_UNUSABLE;
2200
2201         if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2202                 return RX_DROP_UNUSABLE;
2203
2204         switch (mgmt->u.action.category) {
2205         case WLAN_CATEGORY_BACK:
2206                 /*
2207                  * The aggregation code is not prepared to handle
2208                  * anything but STA/AP due to the BSSID handling;
2209                  * IBSS could work in the code but isn't supported
2210                  * by drivers or the standard.
2211                  */
2212                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2213                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2214                     sdata->vif.type != NL80211_IFTYPE_AP)
2215                         break;
2216
2217                 /* verify action_code is present */
2218                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2219                         break;
2220
2221                 switch (mgmt->u.action.u.addba_req.action_code) {
2222                 case WLAN_ACTION_ADDBA_REQ:
2223                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2224                                    sizeof(mgmt->u.action.u.addba_req)))
2225                                 goto invalid;
2226                         break;
2227                 case WLAN_ACTION_ADDBA_RESP:
2228                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2229                                    sizeof(mgmt->u.action.u.addba_resp)))
2230                                 goto invalid;
2231                         break;
2232                 case WLAN_ACTION_DELBA:
2233                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2234                                    sizeof(mgmt->u.action.u.delba)))
2235                                 goto invalid;
2236                         break;
2237                 default:
2238                         goto invalid;
2239                 }
2240
2241                 goto queue;
2242         case WLAN_CATEGORY_SPECTRUM_MGMT:
2243                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2244                         break;
2245
2246                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2247                         break;
2248
2249                 /* verify action_code is present */
2250                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2251                         break;
2252
2253                 switch (mgmt->u.action.u.measurement.action_code) {
2254                 case WLAN_ACTION_SPCT_MSR_REQ:
2255                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2256                                    sizeof(mgmt->u.action.u.measurement)))
2257                                 break;
2258                         ieee80211_process_measurement_req(sdata, mgmt, len);
2259                         goto handled;
2260                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2261                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2262                                    sizeof(mgmt->u.action.u.chan_switch)))
2263                                 break;
2264
2265                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2266                                 break;
2267
2268                         if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2269                                 break;
2270
2271                         goto queue;
2272                 }
2273                 break;
2274         case WLAN_CATEGORY_SA_QUERY:
2275                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2276                            sizeof(mgmt->u.action.u.sa_query)))
2277                         break;
2278
2279                 switch (mgmt->u.action.u.sa_query.action) {
2280                 case WLAN_ACTION_SA_QUERY_REQUEST:
2281                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2282                                 break;
2283                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2284                         goto handled;
2285                 }
2286                 break;
2287         case WLAN_CATEGORY_SELF_PROTECTED:
2288                 switch (mgmt->u.action.u.self_prot.action_code) {
2289                 case WLAN_SP_MESH_PEERING_OPEN:
2290                 case WLAN_SP_MESH_PEERING_CLOSE:
2291                 case WLAN_SP_MESH_PEERING_CONFIRM:
2292                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2293                                 goto invalid;
2294                         if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2295                                 /* userspace handles this frame */
2296                                 break;
2297                         goto queue;
2298                 case WLAN_SP_MGK_INFORM:
2299                 case WLAN_SP_MGK_ACK:
2300                         if (!ieee80211_vif_is_mesh(&sdata->vif))
2301                                 goto invalid;
2302                         break;
2303                 }
2304                 break;
2305         case WLAN_CATEGORY_MESH_ACTION:
2306                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2307                         break;
2308                 if (mesh_action_is_path_sel(mgmt) &&
2309                   (!mesh_path_sel_is_hwmp(sdata)))
2310                         break;
2311                 goto queue;
2312         }
2313
2314         return RX_CONTINUE;
2315
2316  invalid:
2317         status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2318         /* will return in the next handlers */
2319         return RX_CONTINUE;
2320
2321  handled:
2322         if (rx->sta)
2323                 rx->sta->rx_packets++;
2324         dev_kfree_skb(rx->skb);
2325         return RX_QUEUED;
2326
2327  queue:
2328         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2329         skb_queue_tail(&sdata->skb_queue, rx->skb);
2330         ieee80211_queue_work(&local->hw, &sdata->work);
2331         if (rx->sta)
2332                 rx->sta->rx_packets++;
2333         return RX_QUEUED;
2334 }
2335
2336 static ieee80211_rx_result debug_noinline
2337 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2338 {
2339         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2340
2341         /* skip known-bad action frames and return them in the next handler */
2342         if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2343                 return RX_CONTINUE;
2344
2345         /*
2346          * Getting here means the kernel doesn't know how to handle
2347          * it, but maybe userspace does ... include returned frames
2348          * so userspace can register for those to know whether ones
2349          * it transmitted were processed or returned.
2350          */
2351
2352         if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2353                              rx->skb->data, rx->skb->len,
2354                              GFP_ATOMIC)) {
2355                 if (rx->sta)
2356                         rx->sta->rx_packets++;
2357                 dev_kfree_skb(rx->skb);
2358                 return RX_QUEUED;
2359         }
2360
2361
2362         return RX_CONTINUE;
2363 }
2364
2365 static ieee80211_rx_result debug_noinline
2366 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2367 {
2368         struct ieee80211_local *local = rx->local;
2369         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2370         struct sk_buff *nskb;
2371         struct ieee80211_sub_if_data *sdata = rx->sdata;
2372         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2373
2374         if (!ieee80211_is_action(mgmt->frame_control))
2375                 return RX_CONTINUE;
2376
2377         /*
2378          * For AP mode, hostapd is responsible for handling any action
2379          * frames that we didn't handle, including returning unknown
2380          * ones. For all other modes we will return them to the sender,
2381          * setting the 0x80 bit in the action category, as required by
2382          * 802.11-2007 7.3.1.11.
2383          * Newer versions of hostapd shall also use the management frame
2384          * registration mechanisms, but older ones still use cooked
2385          * monitor interfaces so push all frames there.
2386          */
2387         if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2388             (sdata->vif.type == NL80211_IFTYPE_AP ||
2389              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2390                 return RX_DROP_MONITOR;
2391
2392         /* do not return rejected action frames */
2393         if (mgmt->u.action.category & 0x80)
2394                 return RX_DROP_UNUSABLE;
2395
2396         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2397                                GFP_ATOMIC);
2398         if (nskb) {
2399                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2400
2401                 nmgmt->u.action.category |= 0x80;
2402                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2403                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2404
2405                 memset(nskb->cb, 0, sizeof(nskb->cb));
2406
2407                 ieee80211_tx_skb(rx->sdata, nskb);
2408         }
2409         dev_kfree_skb(rx->skb);
2410         return RX_QUEUED;
2411 }
2412
2413 static ieee80211_rx_result debug_noinline
2414 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2415 {
2416         struct ieee80211_sub_if_data *sdata = rx->sdata;
2417         ieee80211_rx_result rxs;
2418         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2419         __le16 stype;
2420
2421         rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2422         if (rxs != RX_CONTINUE)
2423                 return rxs;
2424
2425         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2426
2427         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2428             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2429             sdata->vif.type != NL80211_IFTYPE_STATION)
2430                 return RX_DROP_MONITOR;
2431
2432         switch (stype) {
2433         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2434         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2435                 /* process for all: mesh, mlme, ibss */
2436                 break;
2437         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2438         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2439                 if (is_multicast_ether_addr(mgmt->da) &&
2440                     !is_broadcast_ether_addr(mgmt->da))
2441                         return RX_DROP_MONITOR;
2442
2443                 /* process only for station */
2444                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2445                         return RX_DROP_MONITOR;
2446                 break;
2447         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2448         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2449                 /* process only for ibss */
2450                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2451                         return RX_DROP_MONITOR;
2452                 break;
2453         default:
2454                 return RX_DROP_MONITOR;
2455         }
2456
2457         /* queue up frame and kick off work to process it */
2458         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2459         skb_queue_tail(&sdata->skb_queue, rx->skb);
2460         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2461         if (rx->sta)
2462                 rx->sta->rx_packets++;
2463
2464         return RX_QUEUED;
2465 }
2466
2467 /* TODO: use IEEE80211_RX_FRAGMENTED */
2468 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2469                                         struct ieee80211_rate *rate)
2470 {
2471         struct ieee80211_sub_if_data *sdata;
2472         struct ieee80211_local *local = rx->local;
2473         struct ieee80211_rtap_hdr {
2474                 struct ieee80211_radiotap_header hdr;
2475                 u8 flags;
2476                 u8 rate_or_pad;
2477                 __le16 chan_freq;
2478                 __le16 chan_flags;
2479         } __packed *rthdr;
2480         struct sk_buff *skb = rx->skb, *skb2;
2481         struct net_device *prev_dev = NULL;
2482         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2483
2484         /*
2485          * If cooked monitor has been processed already, then
2486          * don't do it again. If not, set the flag.
2487          */
2488         if (rx->flags & IEEE80211_RX_CMNTR)
2489                 goto out_free_skb;
2490         rx->flags |= IEEE80211_RX_CMNTR;
2491
2492         /* If there are no cooked monitor interfaces, just free the SKB */
2493         if (!local->cooked_mntrs)
2494                 goto out_free_skb;
2495
2496         if (skb_headroom(skb) < sizeof(*rthdr) &&
2497             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2498                 goto out_free_skb;
2499
2500         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2501         memset(rthdr, 0, sizeof(*rthdr));
2502         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2503         rthdr->hdr.it_present =
2504                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2505                             (1 << IEEE80211_RADIOTAP_CHANNEL));
2506
2507         if (rate) {
2508                 rthdr->rate_or_pad = rate->bitrate / 5;
2509                 rthdr->hdr.it_present |=
2510                         cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2511         }
2512         rthdr->chan_freq = cpu_to_le16(status->freq);
2513
2514         if (status->band == IEEE80211_BAND_5GHZ)
2515                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2516                                                 IEEE80211_CHAN_5GHZ);
2517         else
2518                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2519                                                 IEEE80211_CHAN_2GHZ);
2520
2521         skb_set_mac_header(skb, 0);
2522         skb->ip_summed = CHECKSUM_UNNECESSARY;
2523         skb->pkt_type = PACKET_OTHERHOST;
2524         skb->protocol = htons(ETH_P_802_2);
2525
2526         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2527                 if (!ieee80211_sdata_running(sdata))
2528                         continue;
2529
2530                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2531                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2532                         continue;
2533
2534                 if (prev_dev) {
2535                         skb2 = skb_clone(skb, GFP_ATOMIC);
2536                         if (skb2) {
2537                                 skb2->dev = prev_dev;
2538                                 netif_receive_skb(skb2);
2539                         }
2540                 }
2541
2542                 prev_dev = sdata->dev;
2543                 sdata->dev->stats.rx_packets++;
2544                 sdata->dev->stats.rx_bytes += skb->len;
2545         }
2546
2547         if (prev_dev) {
2548                 skb->dev = prev_dev;
2549                 netif_receive_skb(skb);
2550                 return;
2551         }
2552
2553  out_free_skb:
2554         dev_kfree_skb(skb);
2555 }
2556
2557 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2558                                          ieee80211_rx_result res)
2559 {
2560         switch (res) {
2561         case RX_DROP_MONITOR:
2562                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2563                 if (rx->sta)
2564                         rx->sta->rx_dropped++;
2565                 /* fall through */
2566         case RX_CONTINUE: {
2567                 struct ieee80211_rate *rate = NULL;
2568                 struct ieee80211_supported_band *sband;
2569                 struct ieee80211_rx_status *status;
2570
2571                 status = IEEE80211_SKB_RXCB((rx->skb));
2572
2573                 sband = rx->local->hw.wiphy->bands[status->band];
2574                 if (!(status->flag & RX_FLAG_HT))
2575                         rate = &sband->bitrates[status->rate_idx];
2576
2577                 ieee80211_rx_cooked_monitor(rx, rate);
2578                 break;
2579                 }
2580         case RX_DROP_UNUSABLE:
2581                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2582                 if (rx->sta)
2583                         rx->sta->rx_dropped++;
2584                 dev_kfree_skb(rx->skb);
2585                 break;
2586         case RX_QUEUED:
2587                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2588                 break;
2589         }
2590 }
2591
2592 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2593 {
2594         ieee80211_rx_result res = RX_DROP_MONITOR;
2595         struct sk_buff *skb;
2596
2597 #define CALL_RXH(rxh)                   \
2598         do {                            \
2599                 res = rxh(rx);          \
2600                 if (res != RX_CONTINUE) \
2601                         goto rxh_next;  \
2602         } while (0);
2603
2604         spin_lock(&rx->local->rx_skb_queue.lock);
2605         if (rx->local->running_rx_handler)
2606                 goto unlock;
2607
2608         rx->local->running_rx_handler = true;
2609
2610         while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2611                 spin_unlock(&rx->local->rx_skb_queue.lock);
2612
2613                 /*
2614                  * all the other fields are valid across frames
2615                  * that belong to an aMPDU since they are on the
2616                  * same TID from the same station
2617                  */
2618                 rx->skb = skb;
2619
2620                 CALL_RXH(ieee80211_rx_h_decrypt)
2621                 CALL_RXH(ieee80211_rx_h_check_more_data)
2622                 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2623                 CALL_RXH(ieee80211_rx_h_sta_process)
2624                 CALL_RXH(ieee80211_rx_h_defragment)
2625                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2626                 /* must be after MMIC verify so header is counted in MPDU mic */
2627 #ifdef CONFIG_MAC80211_MESH
2628                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2629                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2630 #endif
2631                 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2632                 CALL_RXH(ieee80211_rx_h_amsdu)
2633                 CALL_RXH(ieee80211_rx_h_data)
2634                 CALL_RXH(ieee80211_rx_h_ctrl);
2635                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2636                 CALL_RXH(ieee80211_rx_h_action)
2637                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2638                 CALL_RXH(ieee80211_rx_h_action_return)
2639                 CALL_RXH(ieee80211_rx_h_mgmt)
2640
2641  rxh_next:
2642                 ieee80211_rx_handlers_result(rx, res);
2643                 spin_lock(&rx->local->rx_skb_queue.lock);
2644 #undef CALL_RXH
2645         }
2646
2647         rx->local->running_rx_handler = false;
2648
2649  unlock:
2650         spin_unlock(&rx->local->rx_skb_queue.lock);
2651 }
2652
2653 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2654 {
2655         ieee80211_rx_result res = RX_DROP_MONITOR;
2656
2657 #define CALL_RXH(rxh)                   \
2658         do {                            \
2659                 res = rxh(rx);          \
2660                 if (res != RX_CONTINUE) \
2661                         goto rxh_next;  \
2662         } while (0);
2663
2664         CALL_RXH(ieee80211_rx_h_passive_scan)
2665         CALL_RXH(ieee80211_rx_h_check)
2666
2667         ieee80211_rx_reorder_ampdu(rx);
2668
2669         ieee80211_rx_handlers(rx);
2670         return;
2671
2672  rxh_next:
2673         ieee80211_rx_handlers_result(rx, res);
2674
2675 #undef CALL_RXH
2676 }
2677
2678 /*
2679  * This function makes calls into the RX path, therefore
2680  * it has to be invoked under RCU read lock.
2681  */
2682 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2683 {
2684         struct ieee80211_rx_data rx = {
2685                 .sta = sta,
2686                 .sdata = sta->sdata,
2687                 .local = sta->local,
2688                 /* This is OK -- must be QoS data frame */
2689                 .security_idx = tid,
2690                 .seqno_idx = tid,
2691                 .flags = 0,
2692         };
2693         struct tid_ampdu_rx *tid_agg_rx;
2694
2695         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2696         if (!tid_agg_rx)
2697                 return;
2698
2699         spin_lock(&tid_agg_rx->reorder_lock);
2700         ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2701         spin_unlock(&tid_agg_rx->reorder_lock);
2702
2703         ieee80211_rx_handlers(&rx);
2704 }
2705
2706 /* main receive path */
2707
2708 static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2709                                 struct ieee80211_hdr *hdr)
2710 {
2711         struct ieee80211_sub_if_data *sdata = rx->sdata;
2712         struct sk_buff *skb = rx->skb;
2713         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2714         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2715         int multicast = is_multicast_ether_addr(hdr->addr1);
2716
2717         switch (sdata->vif.type) {
2718         case NL80211_IFTYPE_STATION:
2719                 if (!bssid && !sdata->u.mgd.use_4addr)
2720                         return 0;
2721                 if (!multicast &&
2722                     compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2723                         if (!(sdata->dev->flags & IFF_PROMISC) ||
2724                             sdata->u.mgd.use_4addr)
2725                                 return 0;
2726                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2727                 }
2728                 break;
2729         case NL80211_IFTYPE_ADHOC:
2730                 if (!bssid)
2731                         return 0;
2732                 if (ieee80211_is_beacon(hdr->frame_control)) {
2733                         return 1;
2734                 }
2735                 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2736                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2737                                 return 0;
2738                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2739                 } else if (!multicast &&
2740                            compare_ether_addr(sdata->vif.addr,
2741                                               hdr->addr1) != 0) {
2742                         if (!(sdata->dev->flags & IFF_PROMISC))
2743                                 return 0;
2744                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2745                 } else if (!rx->sta) {
2746                         int rate_idx;
2747                         if (status->flag & RX_FLAG_HT)
2748                                 rate_idx = 0; /* TODO: HT rates */
2749                         else
2750                                 rate_idx = status->rate_idx;
2751                         rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2752                                         hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2753                 }
2754                 break;
2755         case NL80211_IFTYPE_MESH_POINT:
2756                 if (!multicast &&
2757                     compare_ether_addr(sdata->vif.addr,
2758                                        hdr->addr1) != 0) {
2759                         if (!(sdata->dev->flags & IFF_PROMISC))
2760                                 return 0;
2761
2762                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2763                 }
2764                 break;
2765         case NL80211_IFTYPE_AP_VLAN:
2766         case NL80211_IFTYPE_AP:
2767                 if (!bssid) {
2768                         if (compare_ether_addr(sdata->vif.addr,
2769                                                hdr->addr1))
2770                                 return 0;
2771                 } else if (!ieee80211_bssid_match(bssid,
2772                                         sdata->vif.addr)) {
2773                         if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2774                             !ieee80211_is_beacon(hdr->frame_control) &&
2775                             !(ieee80211_is_action(hdr->frame_control) &&
2776                               sdata->vif.p2p))
2777                                 return 0;
2778                         status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2779                 }
2780                 break;
2781         case NL80211_IFTYPE_WDS:
2782                 if (bssid || !ieee80211_is_data(hdr->frame_control))
2783                         return 0;
2784                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2785                         return 0;
2786                 break;
2787         default:
2788                 /* should never get here */
2789                 WARN_ON(1);
2790                 break;
2791         }
2792
2793         return 1;
2794 }
2795
2796 /*
2797  * This function returns whether or not the SKB
2798  * was destined for RX processing or not, which,
2799  * if consume is true, is equivalent to whether
2800  * or not the skb was consumed.
2801  */
2802 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2803                                             struct sk_buff *skb, bool consume)
2804 {
2805         struct ieee80211_local *local = rx->local;
2806         struct ieee80211_sub_if_data *sdata = rx->sdata;
2807         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2808         struct ieee80211_hdr *hdr = (void *)skb->data;
2809         int prepares;
2810
2811         rx->skb = skb;
2812         status->rx_flags |= IEEE80211_RX_RA_MATCH;
2813         prepares = prepare_for_handlers(rx, hdr);
2814
2815         if (!prepares)
2816                 return false;
2817
2818         if (!consume) {
2819                 skb = skb_copy(skb, GFP_ATOMIC);
2820                 if (!skb) {
2821                         if (net_ratelimit())
2822                                 wiphy_debug(local->hw.wiphy,
2823                                         "failed to copy skb for %s\n",
2824                                         sdata->name);
2825                         return true;
2826                 }
2827
2828                 rx->skb = skb;
2829         }
2830
2831         ieee80211_invoke_rx_handlers(rx);
2832         return true;
2833 }
2834
2835 /*
2836  * This is the actual Rx frames handler. as it blongs to Rx path it must
2837  * be called with rcu_read_lock protection.
2838  */
2839 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2840                                          struct sk_buff *skb)
2841 {
2842         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2843         struct ieee80211_local *local = hw_to_local(hw);
2844         struct ieee80211_sub_if_data *sdata;
2845         struct ieee80211_hdr *hdr;
2846         __le16 fc;
2847         struct ieee80211_rx_data rx;
2848         struct ieee80211_sub_if_data *prev;
2849         struct sta_info *sta, *tmp, *prev_sta;
2850         int err = 0;
2851
2852         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2853         memset(&rx, 0, sizeof(rx));
2854         rx.skb = skb;
2855         rx.local = local;
2856
2857         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2858                 local->dot11ReceivedFragmentCount++;
2859
2860         if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2861                      test_bit(SCAN_SW_SCANNING, &local->scanning)))
2862                 status->rx_flags |= IEEE80211_RX_IN_SCAN;
2863
2864         if (ieee80211_is_mgmt(fc))
2865                 err = skb_linearize(skb);
2866         else
2867                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2868
2869         if (err) {
2870                 dev_kfree_skb(skb);
2871                 return;
2872         }
2873
2874         hdr = (struct ieee80211_hdr *)skb->data;
2875         ieee80211_parse_qos(&rx);
2876         ieee80211_verify_alignment(&rx);
2877
2878         if (ieee80211_is_data(fc)) {
2879                 prev_sta = NULL;
2880
2881                 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
2882                         if (!prev_sta) {
2883                                 prev_sta = sta;
2884                                 continue;
2885                         }
2886
2887                         rx.sta = prev_sta;
2888                         rx.sdata = prev_sta->sdata;
2889                         ieee80211_prepare_and_rx_handle(&rx, skb, false);
2890
2891                         prev_sta = sta;
2892                 }
2893
2894                 if (prev_sta) {
2895                         rx.sta = prev_sta;
2896                         rx.sdata = prev_sta->sdata;
2897
2898                         if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2899                                 return;
2900                         goto out;
2901                 }
2902         }
2903
2904         prev = NULL;
2905
2906         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2907                 if (!ieee80211_sdata_running(sdata))
2908                         continue;
2909
2910                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2911                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2912                         continue;
2913
2914                 /*
2915                  * frame is destined for this interface, but if it's
2916                  * not also for the previous one we handle that after
2917                  * the loop to avoid copying the SKB once too much
2918                  */
2919
2920                 if (!prev) {
2921                         prev = sdata;
2922                         continue;
2923                 }
2924
2925                 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2926                 rx.sdata = prev;
2927                 ieee80211_prepare_and_rx_handle(&rx, skb, false);
2928
2929                 prev = sdata;
2930         }
2931
2932         if (prev) {
2933                 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
2934                 rx.sdata = prev;
2935
2936                 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2937                         return;
2938         }
2939
2940  out:
2941         dev_kfree_skb(skb);
2942 }
2943
2944 /*
2945  * This is the receive path handler. It is called by a low level driver when an
2946  * 802.11 MPDU is received from the hardware.
2947  */
2948 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2949 {
2950         struct ieee80211_local *local = hw_to_local(hw);
2951         struct ieee80211_rate *rate = NULL;
2952         struct ieee80211_supported_band *sband;
2953         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2954
2955         WARN_ON_ONCE(softirq_count() == 0);
2956
2957         if (WARN_ON(status->band < 0 ||
2958                     status->band >= IEEE80211_NUM_BANDS))
2959                 goto drop;
2960
2961         sband = local->hw.wiphy->bands[status->band];
2962         if (WARN_ON(!sband))
2963                 goto drop;
2964
2965         /*
2966          * If we're suspending, it is possible although not too likely
2967          * that we'd be receiving frames after having already partially
2968          * quiesced the stack. We can't process such frames then since
2969          * that might, for example, cause stations to be added or other
2970          * driver callbacks be invoked.
2971          */
2972         if (unlikely(local->quiescing || local->suspended))
2973                 goto drop;
2974
2975         /*
2976          * The same happens when we're not even started,
2977          * but that's worth a warning.
2978          */
2979         if (WARN_ON(!local->started))
2980                 goto drop;
2981
2982         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2983                 /*
2984                  * Validate the rate, unless a PLCP error means that
2985                  * we probably can't have a valid rate here anyway.
2986                  */
2987
2988                 if (status->flag & RX_FLAG_HT) {
2989                         /*
2990                          * rate_idx is MCS index, which can be [0-76]
2991                          * as documented on:
2992                          *
2993                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2994                          *
2995                          * Anything else would be some sort of driver or
2996                          * hardware error. The driver should catch hardware
2997                          * errors.
2998                          */
2999                         if (WARN((status->rate_idx < 0 ||
3000                                  status->rate_idx > 76),
3001                                  "Rate marked as an HT rate but passed "
3002                                  "status->rate_idx is not "
3003                                  "an MCS index [0-76]: %d (0x%02x)\n",
3004                                  status->rate_idx,
3005                                  status->rate_idx))
3006                                 goto drop;
3007                 } else {
3008                         if (WARN_ON(status->rate_idx < 0 ||
3009                                     status->rate_idx >= sband->n_bitrates))
3010                                 goto drop;
3011                         rate = &sband->bitrates[status->rate_idx];
3012                 }
3013         }
3014
3015         status->rx_flags = 0;
3016
3017         /*
3018          * key references and virtual interfaces are protected using RCU
3019          * and this requires that we are in a read-side RCU section during
3020          * receive processing
3021          */
3022         rcu_read_lock();
3023
3024         /*
3025          * Frames with failed FCS/PLCP checksum are not returned,
3026          * all other frames are returned without radiotap header
3027          * if it was previously present.
3028          * Also, frames with less than 16 bytes are dropped.
3029          */
3030         skb = ieee80211_rx_monitor(local, skb, rate);
3031         if (!skb) {
3032                 rcu_read_unlock();
3033                 return;
3034         }
3035
3036         ieee80211_tpt_led_trig_rx(local,
3037                         ((struct ieee80211_hdr *)skb->data)->frame_control,
3038                         skb->len);
3039         __ieee80211_rx_handle_packet(hw, skb);
3040
3041         rcu_read_unlock();
3042
3043         return;
3044  drop:
3045         kfree_skb(skb);
3046 }
3047 EXPORT_SYMBOL(ieee80211_rx);
3048
3049 /* This is a version of the rx handler that can be called from hard irq
3050  * context. Post the skb on the queue and schedule the tasklet */
3051 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3052 {
3053         struct ieee80211_local *local = hw_to_local(hw);
3054
3055         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3056
3057         skb->pkt_type = IEEE80211_RX_MSG;
3058         skb_queue_tail(&local->skb_queue, skb);
3059         tasklet_schedule(&local->tasklet);
3060 }
3061 EXPORT_SYMBOL(ieee80211_rx_irqsafe);