mac80211: allow changing port control protocol
[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_TSFT)
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         return len;
89 }
90
91 /*
92  * ieee80211_add_rx_radiotap_header - add radiotap header
93  *
94  * add a radiotap header containing all the fields which the hardware provided.
95  */
96 static void
97 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98                                  struct sk_buff *skb,
99                                  struct ieee80211_rate *rate,
100                                  int rtap_len)
101 {
102         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
103         struct ieee80211_radiotap_header *rthdr;
104         unsigned char *pos;
105         u16 rx_flags = 0;
106
107         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108         memset(rthdr, 0, rtap_len);
109
110         /* radiotap header, set always present flags */
111         rthdr->it_present =
112                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
113                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
114                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
115                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116         rthdr->it_len = cpu_to_le16(rtap_len);
117
118         pos = (unsigned char *)(rthdr+1);
119
120         /* the order of the following fields is important */
121
122         /* IEEE80211_RADIOTAP_TSFT */
123         if (status->flag & RX_FLAG_TSFT) {
124                 put_unaligned_le64(status->mactime, pos);
125                 rthdr->it_present |=
126                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127                 pos += 8;
128         }
129
130         /* IEEE80211_RADIOTAP_FLAGS */
131         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132                 *pos |= IEEE80211_RADIOTAP_F_FCS;
133         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134                 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
135         if (status->flag & RX_FLAG_SHORTPRE)
136                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
137         pos++;
138
139         /* IEEE80211_RADIOTAP_RATE */
140         if (status->flag & RX_FLAG_HT) {
141                 /*
142                  * TODO: add following information into radiotap header once
143                  * suitable fields are defined for it:
144                  * - MCS index (status->rate_idx)
145                  * - HT40 (status->flag & RX_FLAG_40MHZ)
146                  * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147                  */
148                 *pos = 0;
149         } else {
150                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
151                 *pos = rate->bitrate / 5;
152         }
153         pos++;
154
155         /* IEEE80211_RADIOTAP_CHANNEL */
156         put_unaligned_le16(status->freq, pos);
157         pos += 2;
158         if (status->band == IEEE80211_BAND_5GHZ)
159                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160                                    pos);
161         else if (status->flag & RX_FLAG_HT)
162                 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163                                    pos);
164         else if (rate->flags & IEEE80211_RATE_ERP_G)
165                 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166                                    pos);
167         else
168                 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169                                    pos);
170         pos += 2;
171
172         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174                 *pos = status->signal;
175                 rthdr->it_present |=
176                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177                 pos++;
178         }
179
180         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182         /* IEEE80211_RADIOTAP_ANTENNA */
183         *pos = status->antenna;
184         pos++;
185
186         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188         /* IEEE80211_RADIOTAP_RX_FLAGS */
189         /* ensure 2 byte alignment for the 2 byte field as required */
190         if ((pos - (u8 *)rthdr) & 1)
191                 pos++;
192         if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
193                 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194         put_unaligned_le16(rx_flags, pos);
195         pos += 2;
196 }
197
198 /*
199  * This function copies a received frame to all monitor interfaces and
200  * returns a cleaned-up SKB that no longer includes the FCS nor the
201  * radiotap header the driver might have added.
202  */
203 static struct sk_buff *
204 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
205                      struct ieee80211_rate *rate)
206 {
207         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
208         struct ieee80211_sub_if_data *sdata;
209         int needed_headroom = 0;
210         struct sk_buff *skb, *skb2;
211         struct net_device *prev_dev = NULL;
212         int present_fcs_len = 0;
213
214         /*
215          * First, we may need to make a copy of the skb because
216          *  (1) we need to modify it for radiotap (if not present), and
217          *  (2) the other RX handlers will modify the skb we got.
218          *
219          * We don't need to, of course, if we aren't going to return
220          * the SKB because it has a bad FCS/PLCP checksum.
221          */
222
223         /* room for the radiotap header based on driver features */
224         needed_headroom = ieee80211_rx_radiotap_len(local, status);
225
226         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227                 present_fcs_len = FCS_LEN;
228
229         /* make sure hdr->frame_control is on the linear part */
230         if (!pskb_may_pull(origskb, 2)) {
231                 dev_kfree_skb(origskb);
232                 return NULL;
233         }
234
235         if (!local->monitors) {
236                 if (should_drop_frame(origskb, present_fcs_len)) {
237                         dev_kfree_skb(origskb);
238                         return NULL;
239                 }
240
241                 return remove_monitor_info(local, origskb);
242         }
243
244         if (should_drop_frame(origskb, present_fcs_len)) {
245                 /* only need to expand headroom if necessary */
246                 skb = origskb;
247                 origskb = NULL;
248
249                 /*
250                  * This shouldn't trigger often because most devices have an
251                  * RX header they pull before we get here, and that should
252                  * be big enough for our radiotap information. We should
253                  * probably export the length to drivers so that we can have
254                  * them allocate enough headroom to start with.
255                  */
256                 if (skb_headroom(skb) < needed_headroom &&
257                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
258                         dev_kfree_skb(skb);
259                         return NULL;
260                 }
261         } else {
262                 /*
263                  * Need to make a copy and possibly remove radiotap header
264                  * and FCS from the original.
265                  */
266                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
268                 origskb = remove_monitor_info(local, origskb);
269
270                 if (!skb)
271                         return origskb;
272         }
273
274         /* prepend radiotap information */
275         ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
276
277         skb_reset_mac_header(skb);
278         skb->ip_summed = CHECKSUM_UNNECESSARY;
279         skb->pkt_type = PACKET_OTHERHOST;
280         skb->protocol = htons(ETH_P_802_2);
281
282         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
283                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
284                         continue;
285
286                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287                         continue;
288
289                 if (!ieee80211_sdata_running(sdata))
290                         continue;
291
292                 if (prev_dev) {
293                         skb2 = skb_clone(skb, GFP_ATOMIC);
294                         if (skb2) {
295                                 skb2->dev = prev_dev;
296                                 netif_receive_skb(skb2);
297                         }
298                 }
299
300                 prev_dev = sdata->dev;
301                 sdata->dev->stats.rx_packets++;
302                 sdata->dev->stats.rx_bytes += skb->len;
303         }
304
305         if (prev_dev) {
306                 skb->dev = prev_dev;
307                 netif_receive_skb(skb);
308         } else
309                 dev_kfree_skb(skb);
310
311         return origskb;
312 }
313
314
315 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
316 {
317         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
318         int tid;
319
320         /* does the frame have a qos control field? */
321         if (ieee80211_is_data_qos(hdr->frame_control)) {
322                 u8 *qc = ieee80211_get_qos_ctl(hdr);
323                 /* frame has qos control */
324                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325                 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
326                         rx->flags |= IEEE80211_RX_AMSDU;
327                 else
328                         rx->flags &= ~IEEE80211_RX_AMSDU;
329         } else {
330                 /*
331                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332                  *
333                  *      Sequence numbers for management frames, QoS data
334                  *      frames with a broadcast/multicast address in the
335                  *      Address 1 field, and all non-QoS data frames sent
336                  *      by QoS STAs are assigned using an additional single
337                  *      modulo-4096 counter, [...]
338                  *
339                  * We also use that counter for non-QoS STAs.
340                  */
341                 tid = NUM_RX_DATA_QUEUES - 1;
342         }
343
344         rx->queue = tid;
345         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346          * For now, set skb->priority to 0 for other cases. */
347         rx->skb->priority = (tid > 7) ? 0 : tid;
348 }
349
350 /**
351  * DOC: Packet alignment
352  *
353  * Drivers always need to pass packets that are aligned to two-byte boundaries
354  * to the stack.
355  *
356  * Additionally, should, if possible, align the payload data in a way that
357  * guarantees that the contained IP header is aligned to a four-byte
358  * boundary. In the case of regular frames, this simply means aligning the
359  * payload to a four-byte boundary (because either the IP header is directly
360  * contained, or IV/RFC1042 headers that have a length divisible by four are
361  * in front of it).  If the payload data is not properly aligned and the
362  * architecture doesn't support efficient unaligned operations, mac80211
363  * will align the data.
364  *
365  * With A-MSDU frames, however, the payload data address must yield two modulo
366  * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367  * push the IP header further back to a multiple of four again. Thankfully, the
368  * specs were sane enough this time around to require padding each A-MSDU
369  * subframe to a length that is a multiple of four.
370  *
371  * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372  * the payload is not supported, the driver is required to move the 802.11
373  * header to be directly in front of the payload in that case.
374  */
375 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
376 {
377 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378         WARN_ONCE((unsigned long)rx->skb->data & 1,
379                   "unaligned packet at 0x%p\n", rx->skb->data);
380 #endif
381 }
382
383
384 /* rx handlers */
385
386 static ieee80211_rx_result debug_noinline
387 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
388 {
389         struct ieee80211_local *local = rx->local;
390         struct sk_buff *skb = rx->skb;
391
392         if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
393                 return ieee80211_scan_rx(rx->sdata, skb);
394
395         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
396                      (rx->flags & IEEE80211_RX_IN_SCAN))) {
397                 /* drop all the other packets during a software scan anyway */
398                 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
399                         dev_kfree_skb(skb);
400                 return RX_QUEUED;
401         }
402
403         if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
404                 /* scanning finished during invoking of handlers */
405                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
406                 return RX_DROP_UNUSABLE;
407         }
408
409         return RX_CONTINUE;
410 }
411
412
413 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
414 {
415         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
416
417         if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
418                 return 0;
419
420         return ieee80211_is_robust_mgmt_frame(hdr);
421 }
422
423
424 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
425 {
426         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
427
428         if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
429                 return 0;
430
431         return ieee80211_is_robust_mgmt_frame(hdr);
432 }
433
434
435 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
437 {
438         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
439         struct ieee80211_mmie *mmie;
440
441         if (skb->len < 24 + sizeof(*mmie) ||
442             !is_multicast_ether_addr(hdr->da))
443                 return -1;
444
445         if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
446                 return -1; /* not a robust management frame */
447
448         mmie = (struct ieee80211_mmie *)
449                 (skb->data + skb->len - sizeof(*mmie));
450         if (mmie->element_id != WLAN_EID_MMIE ||
451             mmie->length != sizeof(*mmie) - 2)
452                 return -1;
453
454         return le16_to_cpu(mmie->key_id);
455 }
456
457
458 static ieee80211_rx_result
459 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
460 {
461         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
462         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
463         char *dev_addr = rx->sdata->vif.addr;
464
465         if (ieee80211_is_data(hdr->frame_control)) {
466                 if (is_multicast_ether_addr(hdr->addr1)) {
467                         if (ieee80211_has_tods(hdr->frame_control) ||
468                                 !ieee80211_has_fromds(hdr->frame_control))
469                                 return RX_DROP_MONITOR;
470                         if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
471                                 return RX_DROP_MONITOR;
472                 } else {
473                         if (!ieee80211_has_a4(hdr->frame_control))
474                                 return RX_DROP_MONITOR;
475                         if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
476                                 return RX_DROP_MONITOR;
477                 }
478         }
479
480         /* If there is not an established peer link and this is not a peer link
481          * establisment frame, beacon or probe, drop the frame.
482          */
483
484         if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
485                 struct ieee80211_mgmt *mgmt;
486
487                 if (!ieee80211_is_mgmt(hdr->frame_control))
488                         return RX_DROP_MONITOR;
489
490                 if (ieee80211_is_action(hdr->frame_control)) {
491                         mgmt = (struct ieee80211_mgmt *)hdr;
492                         if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
493                                 return RX_DROP_MONITOR;
494                         return RX_CONTINUE;
495                 }
496
497                 if (ieee80211_is_probe_req(hdr->frame_control) ||
498                     ieee80211_is_probe_resp(hdr->frame_control) ||
499                     ieee80211_is_beacon(hdr->frame_control))
500                         return RX_CONTINUE;
501
502                 return RX_DROP_MONITOR;
503
504         }
505
506 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
507
508         if (ieee80211_is_data(hdr->frame_control) &&
509             is_multicast_ether_addr(hdr->addr1) &&
510             mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
511                 return RX_DROP_MONITOR;
512 #undef msh_h_get
513
514         return RX_CONTINUE;
515 }
516
517 #define SEQ_MODULO 0x1000
518 #define SEQ_MASK   0xfff
519
520 static inline int seq_less(u16 sq1, u16 sq2)
521 {
522         return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
523 }
524
525 static inline u16 seq_inc(u16 sq)
526 {
527         return (sq + 1) & SEQ_MASK;
528 }
529
530 static inline u16 seq_sub(u16 sq1, u16 sq2)
531 {
532         return (sq1 - sq2) & SEQ_MASK;
533 }
534
535
536 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
537                                             struct tid_ampdu_rx *tid_agg_rx,
538                                             int index,
539                                             struct sk_buff_head *frames)
540 {
541         struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
542
543         if (!skb)
544                 goto no_frame;
545
546         /* release the frame from the reorder ring buffer */
547         tid_agg_rx->stored_mpdu_num--;
548         tid_agg_rx->reorder_buf[index] = NULL;
549         __skb_queue_tail(frames, skb);
550
551 no_frame:
552         tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
553 }
554
555 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
556                                              struct tid_ampdu_rx *tid_agg_rx,
557                                              u16 head_seq_num,
558                                              struct sk_buff_head *frames)
559 {
560         int index;
561
562         while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
563                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
564                                                         tid_agg_rx->buf_size;
565                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
566         }
567 }
568
569 /*
570  * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
571  * the skb was added to the buffer longer than this time ago, the earlier
572  * frames that have not yet been received are assumed to be lost and the skb
573  * can be released for processing. This may also release other skb's from the
574  * reorder buffer if there are no additional gaps between the frames.
575  *
576  * Callers must hold tid_agg_rx->reorder_lock.
577  */
578 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
579
580 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
581                                           struct tid_ampdu_rx *tid_agg_rx,
582                                           struct sk_buff_head *frames)
583 {
584         int index, j;
585
586         /* release the buffer until next missing frame */
587         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
588                                                 tid_agg_rx->buf_size;
589         if (!tid_agg_rx->reorder_buf[index] &&
590             tid_agg_rx->stored_mpdu_num > 1) {
591                 /*
592                  * No buffers ready to be released, but check whether any
593                  * frames in the reorder buffer have timed out.
594                  */
595                 int skipped = 1;
596                 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
597                      j = (j + 1) % tid_agg_rx->buf_size) {
598                         if (!tid_agg_rx->reorder_buf[j]) {
599                                 skipped++;
600                                 continue;
601                         }
602                         if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
603                                         HT_RX_REORDER_BUF_TIMEOUT))
604                                 goto set_release_timer;
605
606 #ifdef CONFIG_MAC80211_HT_DEBUG
607                         if (net_ratelimit())
608                                 wiphy_debug(hw->wiphy,
609                                             "release an RX reorder frame due to timeout on earlier frames\n");
610 #endif
611                         ieee80211_release_reorder_frame(hw, tid_agg_rx,
612                                                         j, frames);
613
614                         /*
615                          * Increment the head seq# also for the skipped slots.
616                          */
617                         tid_agg_rx->head_seq_num =
618                                 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
619                         skipped = 0;
620                 }
621         } else while (tid_agg_rx->reorder_buf[index]) {
622                 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
623                 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
624                                                         tid_agg_rx->buf_size;
625         }
626
627         if (tid_agg_rx->stored_mpdu_num) {
628                 j = index = seq_sub(tid_agg_rx->head_seq_num,
629                                     tid_agg_rx->ssn) % tid_agg_rx->buf_size;
630
631                 for (; j != (index - 1) % tid_agg_rx->buf_size;
632                      j = (j + 1) % tid_agg_rx->buf_size) {
633                         if (tid_agg_rx->reorder_buf[j])
634                                 break;
635                 }
636
637  set_release_timer:
638
639                 mod_timer(&tid_agg_rx->reorder_timer,
640                           tid_agg_rx->reorder_time[j] +
641                           HT_RX_REORDER_BUF_TIMEOUT);
642         } else {
643                 del_timer(&tid_agg_rx->reorder_timer);
644         }
645 }
646
647 /*
648  * As this function belongs to the RX path it must be under
649  * rcu_read_lock protection. It returns false if the frame
650  * can be processed immediately, true if it was consumed.
651  */
652 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
653                                              struct tid_ampdu_rx *tid_agg_rx,
654                                              struct sk_buff *skb,
655                                              struct sk_buff_head *frames)
656 {
657         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
658         u16 sc = le16_to_cpu(hdr->seq_ctrl);
659         u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
660         u16 head_seq_num, buf_size;
661         int index;
662         bool ret = true;
663
664         buf_size = tid_agg_rx->buf_size;
665         head_seq_num = tid_agg_rx->head_seq_num;
666
667         spin_lock(&tid_agg_rx->reorder_lock);
668         /* frame with out of date sequence number */
669         if (seq_less(mpdu_seq_num, head_seq_num)) {
670                 dev_kfree_skb(skb);
671                 goto out;
672         }
673
674         /*
675          * If frame the sequence number exceeds our buffering window
676          * size release some previous frames to make room for this one.
677          */
678         if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
679                 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
680                 /* release stored frames up to new head to stack */
681                 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
682                                                  frames);
683         }
684
685         /* Now the new frame is always in the range of the reordering buffer */
686
687         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
688
689         /* check if we already stored this frame */
690         if (tid_agg_rx->reorder_buf[index]) {
691                 dev_kfree_skb(skb);
692                 goto out;
693         }
694
695         /*
696          * If the current MPDU is in the right order and nothing else
697          * is stored we can process it directly, no need to buffer it.
698          */
699         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
700             tid_agg_rx->stored_mpdu_num == 0) {
701                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
702                 ret = false;
703                 goto out;
704         }
705
706         /* put the frame in the reordering buffer */
707         tid_agg_rx->reorder_buf[index] = skb;
708         tid_agg_rx->reorder_time[index] = jiffies;
709         tid_agg_rx->stored_mpdu_num++;
710         ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
711
712  out:
713         spin_unlock(&tid_agg_rx->reorder_lock);
714         return ret;
715 }
716
717 /*
718  * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
719  * true if the MPDU was buffered, false if it should be processed.
720  */
721 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
722                                        struct sk_buff_head *frames)
723 {
724         struct sk_buff *skb = rx->skb;
725         struct ieee80211_local *local = rx->local;
726         struct ieee80211_hw *hw = &local->hw;
727         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
728         struct sta_info *sta = rx->sta;
729         struct tid_ampdu_rx *tid_agg_rx;
730         u16 sc;
731         int tid;
732
733         if (!ieee80211_is_data_qos(hdr->frame_control))
734                 goto dont_reorder;
735
736         /*
737          * filter the QoS data rx stream according to
738          * STA/TID and check if this STA/TID is on aggregation
739          */
740
741         if (!sta)
742                 goto dont_reorder;
743
744         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
745
746         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
747         if (!tid_agg_rx)
748                 goto dont_reorder;
749
750         /* qos null data frames are excluded */
751         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
752                 goto dont_reorder;
753
754         /* new, potentially un-ordered, ampdu frame - process it */
755
756         /* reset session timer */
757         if (tid_agg_rx->timeout)
758                 mod_timer(&tid_agg_rx->session_timer,
759                           TU_TO_EXP_TIME(tid_agg_rx->timeout));
760
761         /* if this mpdu is fragmented - terminate rx aggregation session */
762         sc = le16_to_cpu(hdr->seq_ctrl);
763         if (sc & IEEE80211_SCTL_FRAG) {
764                 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
765                 skb_queue_tail(&rx->sdata->skb_queue, skb);
766                 ieee80211_queue_work(&local->hw, &rx->sdata->work);
767                 return;
768         }
769
770         /*
771          * No locking needed -- we will only ever process one
772          * RX packet at a time, and thus own tid_agg_rx. All
773          * other code manipulating it needs to (and does) make
774          * sure that we cannot get to it any more before doing
775          * anything with it.
776          */
777         if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
778                 return;
779
780  dont_reorder:
781         __skb_queue_tail(frames, skb);
782 }
783
784 static ieee80211_rx_result debug_noinline
785 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
786 {
787         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
788
789         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
790         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
791                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
792                              rx->sta->last_seq_ctrl[rx->queue] ==
793                              hdr->seq_ctrl)) {
794                         if (rx->flags & IEEE80211_RX_RA_MATCH) {
795                                 rx->local->dot11FrameDuplicateCount++;
796                                 rx->sta->num_duplicates++;
797                         }
798                         return RX_DROP_MONITOR;
799                 } else
800                         rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
801         }
802
803         if (unlikely(rx->skb->len < 16)) {
804                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
805                 return RX_DROP_MONITOR;
806         }
807
808         /* Drop disallowed frame classes based on STA auth/assoc state;
809          * IEEE 802.11, Chap 5.5.
810          *
811          * mac80211 filters only based on association state, i.e. it drops
812          * Class 3 frames from not associated stations. hostapd sends
813          * deauth/disassoc frames when needed. In addition, hostapd is
814          * responsible for filtering on both auth and assoc states.
815          */
816
817         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
818                 return ieee80211_rx_mesh_check(rx);
819
820         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
821                       ieee80211_is_pspoll(hdr->frame_control)) &&
822                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
823                      (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
824                 if ((!ieee80211_has_fromds(hdr->frame_control) &&
825                      !ieee80211_has_tods(hdr->frame_control) &&
826                      ieee80211_is_data(hdr->frame_control)) ||
827                     !(rx->flags & IEEE80211_RX_RA_MATCH)) {
828                         /* Drop IBSS frames and frames for other hosts
829                          * silently. */
830                         return RX_DROP_MONITOR;
831                 }
832
833                 return RX_DROP_MONITOR;
834         }
835
836         return RX_CONTINUE;
837 }
838
839
840 static ieee80211_rx_result debug_noinline
841 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
842 {
843         struct sk_buff *skb = rx->skb;
844         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
845         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
846         int keyidx;
847         int hdrlen;
848         ieee80211_rx_result result = RX_DROP_UNUSABLE;
849         struct ieee80211_key *stakey = NULL;
850         int mmie_keyidx = -1;
851         __le16 fc;
852
853         /*
854          * Key selection 101
855          *
856          * There are four types of keys:
857          *  - GTK (group keys)
858          *  - IGTK (group keys for management frames)
859          *  - PTK (pairwise keys)
860          *  - STK (station-to-station pairwise keys)
861          *
862          * When selecting a key, we have to distinguish between multicast
863          * (including broadcast) and unicast frames, the latter can only
864          * use PTKs and STKs while the former always use GTKs and IGTKs.
865          * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
866          * unicast frames can also use key indices like GTKs. Hence, if we
867          * don't have a PTK/STK we check the key index for a WEP key.
868          *
869          * Note that in a regular BSS, multicast frames are sent by the
870          * AP only, associated stations unicast the frame to the AP first
871          * which then multicasts it on their behalf.
872          *
873          * There is also a slight problem in IBSS mode: GTKs are negotiated
874          * with each station, that is something we don't currently handle.
875          * The spec seems to expect that one negotiates the same key with
876          * every station but there's no such requirement; VLANs could be
877          * possible.
878          */
879
880         /*
881          * No point in finding a key and decrypting if the frame is neither
882          * addressed to us nor a multicast frame.
883          */
884         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
885                 return RX_CONTINUE;
886
887         /* start without a key */
888         rx->key = NULL;
889
890         if (rx->sta)
891                 stakey = rcu_dereference(rx->sta->key);
892
893         fc = hdr->frame_control;
894
895         if (!ieee80211_has_protected(fc))
896                 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
897
898         if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
899                 rx->key = stakey;
900                 if ((status->flag & RX_FLAG_DECRYPTED) &&
901                     (status->flag & RX_FLAG_IV_STRIPPED))
902                         return RX_CONTINUE;
903                 /* Skip decryption if the frame is not protected. */
904                 if (!ieee80211_has_protected(fc))
905                         return RX_CONTINUE;
906         } else if (mmie_keyidx >= 0) {
907                 /* Broadcast/multicast robust management frame / BIP */
908                 if ((status->flag & RX_FLAG_DECRYPTED) &&
909                     (status->flag & RX_FLAG_IV_STRIPPED))
910                         return RX_CONTINUE;
911
912                 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
913                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
914                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
915                 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
916         } else if (!ieee80211_has_protected(fc)) {
917                 /*
918                  * The frame was not protected, so skip decryption. However, we
919                  * need to set rx->key if there is a key that could have been
920                  * used so that the frame may be dropped if encryption would
921                  * have been expected.
922                  */
923                 struct ieee80211_key *key = NULL;
924                 if (ieee80211_is_mgmt(fc) &&
925                     is_multicast_ether_addr(hdr->addr1) &&
926                     (key = rcu_dereference(rx->sdata->default_mgmt_key)))
927                         rx->key = key;
928                 else if ((key = rcu_dereference(rx->sdata->default_key)))
929                         rx->key = key;
930                 return RX_CONTINUE;
931         } else {
932                 u8 keyid;
933                 /*
934                  * The device doesn't give us the IV so we won't be
935                  * able to look up the key. That's ok though, we
936                  * don't need to decrypt the frame, we just won't
937                  * be able to keep statistics accurate.
938                  * Except for key threshold notifications, should
939                  * we somehow allow the driver to tell us which key
940                  * the hardware used if this flag is set?
941                  */
942                 if ((status->flag & RX_FLAG_DECRYPTED) &&
943                     (status->flag & RX_FLAG_IV_STRIPPED))
944                         return RX_CONTINUE;
945
946                 hdrlen = ieee80211_hdrlen(fc);
947
948                 if (rx->skb->len < 8 + hdrlen)
949                         return RX_DROP_UNUSABLE; /* TODO: count this? */
950
951                 /*
952                  * no need to call ieee80211_wep_get_keyidx,
953                  * it verifies a bunch of things we've done already
954                  */
955                 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
956                 keyidx = keyid >> 6;
957
958                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
959
960                 /*
961                  * RSNA-protected unicast frames should always be sent with
962                  * pairwise or station-to-station keys, but for WEP we allow
963                  * using a key index as well.
964                  */
965                 if (rx->key && rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
966                     rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
967                     !is_multicast_ether_addr(hdr->addr1))
968                         rx->key = NULL;
969         }
970
971         if (rx->key) {
972                 rx->key->tx_rx_count++;
973                 /* TODO: add threshold stuff again */
974         } else {
975                 return RX_DROP_MONITOR;
976         }
977
978         if (skb_linearize(rx->skb))
979                 return RX_DROP_UNUSABLE;
980         /* the hdr variable is invalid now! */
981
982         switch (rx->key->conf.cipher) {
983         case WLAN_CIPHER_SUITE_WEP40:
984         case WLAN_CIPHER_SUITE_WEP104:
985                 /* Check for weak IVs if possible */
986                 if (rx->sta && ieee80211_is_data(fc) &&
987                     (!(status->flag & RX_FLAG_IV_STRIPPED) ||
988                      !(status->flag & RX_FLAG_DECRYPTED)) &&
989                     ieee80211_wep_is_weak_iv(rx->skb, rx->key))
990                         rx->sta->wep_weak_iv_count++;
991
992                 result = ieee80211_crypto_wep_decrypt(rx);
993                 break;
994         case WLAN_CIPHER_SUITE_TKIP:
995                 result = ieee80211_crypto_tkip_decrypt(rx);
996                 break;
997         case WLAN_CIPHER_SUITE_CCMP:
998                 result = ieee80211_crypto_ccmp_decrypt(rx);
999                 break;
1000         case WLAN_CIPHER_SUITE_AES_CMAC:
1001                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1002                 break;
1003         default:
1004                 /*
1005                  * We can reach here only with HW-only algorithms
1006                  * but why didn't it decrypt the frame?!
1007                  */
1008                 return RX_DROP_UNUSABLE;
1009         }
1010
1011         /* either the frame has been decrypted or will be dropped */
1012         status->flag |= RX_FLAG_DECRYPTED;
1013
1014         return result;
1015 }
1016
1017 static ieee80211_rx_result debug_noinline
1018 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1019 {
1020         struct ieee80211_local *local;
1021         struct ieee80211_hdr *hdr;
1022         struct sk_buff *skb;
1023
1024         local = rx->local;
1025         skb = rx->skb;
1026         hdr = (struct ieee80211_hdr *) skb->data;
1027
1028         if (!local->pspolling)
1029                 return RX_CONTINUE;
1030
1031         if (!ieee80211_has_fromds(hdr->frame_control))
1032                 /* this is not from AP */
1033                 return RX_CONTINUE;
1034
1035         if (!ieee80211_is_data(hdr->frame_control))
1036                 return RX_CONTINUE;
1037
1038         if (!ieee80211_has_moredata(hdr->frame_control)) {
1039                 /* AP has no more frames buffered for us */
1040                 local->pspolling = false;
1041                 return RX_CONTINUE;
1042         }
1043
1044         /* more data bit is set, let's request a new frame from the AP */
1045         ieee80211_send_pspoll(local, rx->sdata);
1046
1047         return RX_CONTINUE;
1048 }
1049
1050 static void ap_sta_ps_start(struct sta_info *sta)
1051 {
1052         struct ieee80211_sub_if_data *sdata = sta->sdata;
1053         struct ieee80211_local *local = sdata->local;
1054
1055         atomic_inc(&sdata->bss->num_sta_ps);
1056         set_sta_flags(sta, WLAN_STA_PS_STA);
1057         drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1058 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1059         printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1060                sdata->name, sta->sta.addr, sta->sta.aid);
1061 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1062 }
1063
1064 static void ap_sta_ps_end(struct sta_info *sta)
1065 {
1066         struct ieee80211_sub_if_data *sdata = sta->sdata;
1067
1068         atomic_dec(&sdata->bss->num_sta_ps);
1069
1070         clear_sta_flags(sta, WLAN_STA_PS_STA);
1071
1072 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1073         printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1074                sdata->name, sta->sta.addr, sta->sta.aid);
1075 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1076
1077         if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
1078 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1079                 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1080                        sdata->name, sta->sta.addr, sta->sta.aid);
1081 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1082                 return;
1083         }
1084
1085         ieee80211_sta_ps_deliver_wakeup(sta);
1086 }
1087
1088 static ieee80211_rx_result debug_noinline
1089 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1090 {
1091         struct sta_info *sta = rx->sta;
1092         struct sk_buff *skb = rx->skb;
1093         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1094         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1095
1096         if (!sta)
1097                 return RX_CONTINUE;
1098
1099         /*
1100          * Update last_rx only for IBSS packets which are for the current
1101          * BSSID to avoid keeping the current IBSS network alive in cases
1102          * where other STAs start using different BSSID.
1103          */
1104         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1105                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1106                                                 NL80211_IFTYPE_ADHOC);
1107                 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
1108                         sta->last_rx = jiffies;
1109         } else if (!is_multicast_ether_addr(hdr->addr1)) {
1110                 /*
1111                  * Mesh beacons will update last_rx when if they are found to
1112                  * match the current local configuration when processed.
1113                  */
1114                 sta->last_rx = jiffies;
1115         }
1116
1117         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1118                 return RX_CONTINUE;
1119
1120         if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1121                 ieee80211_sta_rx_notify(rx->sdata, hdr);
1122
1123         sta->rx_fragments++;
1124         sta->rx_bytes += rx->skb->len;
1125         sta->last_signal = status->signal;
1126
1127         /*
1128          * Change STA power saving mode only at the end of a frame
1129          * exchange sequence.
1130          */
1131         if (!ieee80211_has_morefrags(hdr->frame_control) &&
1132             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1133              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1134                 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
1135                         /*
1136                          * Ignore doze->wake transitions that are
1137                          * indicated by non-data frames, the standard
1138                          * is unclear here, but for example going to
1139                          * PS mode and then scanning would cause a
1140                          * doze->wake transition for the probe request,
1141                          * and that is clearly undesirable.
1142                          */
1143                         if (ieee80211_is_data(hdr->frame_control) &&
1144                             !ieee80211_has_pm(hdr->frame_control))
1145                                 ap_sta_ps_end(sta);
1146                 } else {
1147                         if (ieee80211_has_pm(hdr->frame_control))
1148                                 ap_sta_ps_start(sta);
1149                 }
1150         }
1151
1152         /*
1153          * Drop (qos-)data::nullfunc frames silently, since they
1154          * are used only to control station power saving mode.
1155          */
1156         if (ieee80211_is_nullfunc(hdr->frame_control) ||
1157             ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1158                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1159
1160                 /*
1161                  * If we receive a 4-addr nullfunc frame from a STA
1162                  * that was not moved to a 4-addr STA vlan yet, drop
1163                  * the frame to the monitor interface, to make sure
1164                  * that hostapd sees it
1165                  */
1166                 if (ieee80211_has_a4(hdr->frame_control) &&
1167                     (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1168                      (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1169                       !rx->sdata->u.vlan.sta)))
1170                         return RX_DROP_MONITOR;
1171                 /*
1172                  * Update counter and free packet here to avoid
1173                  * counting this as a dropped packed.
1174                  */
1175                 sta->rx_packets++;
1176                 dev_kfree_skb(rx->skb);
1177                 return RX_QUEUED;
1178         }
1179
1180         return RX_CONTINUE;
1181 } /* ieee80211_rx_h_sta_process */
1182
1183 static inline struct ieee80211_fragment_entry *
1184 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1185                          unsigned int frag, unsigned int seq, int rx_queue,
1186                          struct sk_buff **skb)
1187 {
1188         struct ieee80211_fragment_entry *entry;
1189         int idx;
1190
1191         idx = sdata->fragment_next;
1192         entry = &sdata->fragments[sdata->fragment_next++];
1193         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1194                 sdata->fragment_next = 0;
1195
1196         if (!skb_queue_empty(&entry->skb_list)) {
1197 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1198                 struct ieee80211_hdr *hdr =
1199                         (struct ieee80211_hdr *) entry->skb_list.next->data;
1200                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1201                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1202                        "addr1=%pM addr2=%pM\n",
1203                        sdata->name, idx,
1204                        jiffies - entry->first_frag_time, entry->seq,
1205                        entry->last_frag, hdr->addr1, hdr->addr2);
1206 #endif
1207                 __skb_queue_purge(&entry->skb_list);
1208         }
1209
1210         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1211         *skb = NULL;
1212         entry->first_frag_time = jiffies;
1213         entry->seq = seq;
1214         entry->rx_queue = rx_queue;
1215         entry->last_frag = frag;
1216         entry->ccmp = 0;
1217         entry->extra_len = 0;
1218
1219         return entry;
1220 }
1221
1222 static inline struct ieee80211_fragment_entry *
1223 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1224                           unsigned int frag, unsigned int seq,
1225                           int rx_queue, struct ieee80211_hdr *hdr)
1226 {
1227         struct ieee80211_fragment_entry *entry;
1228         int i, idx;
1229
1230         idx = sdata->fragment_next;
1231         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1232                 struct ieee80211_hdr *f_hdr;
1233
1234                 idx--;
1235                 if (idx < 0)
1236                         idx = IEEE80211_FRAGMENT_MAX - 1;
1237
1238                 entry = &sdata->fragments[idx];
1239                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1240                     entry->rx_queue != rx_queue ||
1241                     entry->last_frag + 1 != frag)
1242                         continue;
1243
1244                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1245
1246                 /*
1247                  * Check ftype and addresses are equal, else check next fragment
1248                  */
1249                 if (((hdr->frame_control ^ f_hdr->frame_control) &
1250                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1251                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1252                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1253                         continue;
1254
1255                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1256                         __skb_queue_purge(&entry->skb_list);
1257                         continue;
1258                 }
1259                 return entry;
1260         }
1261
1262         return NULL;
1263 }
1264
1265 static ieee80211_rx_result debug_noinline
1266 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1267 {
1268         struct ieee80211_hdr *hdr;
1269         u16 sc;
1270         __le16 fc;
1271         unsigned int frag, seq;
1272         struct ieee80211_fragment_entry *entry;
1273         struct sk_buff *skb;
1274
1275         hdr = (struct ieee80211_hdr *)rx->skb->data;
1276         fc = hdr->frame_control;
1277         sc = le16_to_cpu(hdr->seq_ctrl);
1278         frag = sc & IEEE80211_SCTL_FRAG;
1279
1280         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1281                    (rx->skb)->len < 24 ||
1282                    is_multicast_ether_addr(hdr->addr1))) {
1283                 /* not fragmented */
1284                 goto out;
1285         }
1286         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1287
1288         if (skb_linearize(rx->skb))
1289                 return RX_DROP_UNUSABLE;
1290
1291         /*
1292          *  skb_linearize() might change the skb->data and
1293          *  previously cached variables (in this case, hdr) need to
1294          *  be refreshed with the new data.
1295          */
1296         hdr = (struct ieee80211_hdr *)rx->skb->data;
1297         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1298
1299         if (frag == 0) {
1300                 /* This is the first fragment of a new frame. */
1301                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1302                                                  rx->queue, &(rx->skb));
1303                 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1304                     ieee80211_has_protected(fc)) {
1305                         int queue = ieee80211_is_mgmt(fc) ?
1306                                 NUM_RX_DATA_QUEUES : rx->queue;
1307                         /* Store CCMP PN so that we can verify that the next
1308                          * fragment has a sequential PN value. */
1309                         entry->ccmp = 1;
1310                         memcpy(entry->last_pn,
1311                                rx->key->u.ccmp.rx_pn[queue],
1312                                CCMP_PN_LEN);
1313                 }
1314                 return RX_QUEUED;
1315         }
1316
1317         /* This is a fragment for a frame that should already be pending in
1318          * fragment cache. Add this fragment to the end of the pending entry.
1319          */
1320         entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1321         if (!entry) {
1322                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1323                 return RX_DROP_MONITOR;
1324         }
1325
1326         /* Verify that MPDUs within one MSDU have sequential PN values.
1327          * (IEEE 802.11i, 8.3.3.4.5) */
1328         if (entry->ccmp) {
1329                 int i;
1330                 u8 pn[CCMP_PN_LEN], *rpn;
1331                 int queue;
1332                 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1333                         return RX_DROP_UNUSABLE;
1334                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1335                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1336                         pn[i]++;
1337                         if (pn[i])
1338                                 break;
1339                 }
1340                 queue = ieee80211_is_mgmt(fc) ?
1341                         NUM_RX_DATA_QUEUES : rx->queue;
1342                 rpn = rx->key->u.ccmp.rx_pn[queue];
1343                 if (memcmp(pn, rpn, CCMP_PN_LEN))
1344                         return RX_DROP_UNUSABLE;
1345                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1346         }
1347
1348         skb_pull(rx->skb, ieee80211_hdrlen(fc));
1349         __skb_queue_tail(&entry->skb_list, rx->skb);
1350         entry->last_frag = frag;
1351         entry->extra_len += rx->skb->len;
1352         if (ieee80211_has_morefrags(fc)) {
1353                 rx->skb = NULL;
1354                 return RX_QUEUED;
1355         }
1356
1357         rx->skb = __skb_dequeue(&entry->skb_list);
1358         if (skb_tailroom(rx->skb) < entry->extra_len) {
1359                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1360                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1361                                               GFP_ATOMIC))) {
1362                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1363                         __skb_queue_purge(&entry->skb_list);
1364                         return RX_DROP_UNUSABLE;
1365                 }
1366         }
1367         while ((skb = __skb_dequeue(&entry->skb_list))) {
1368                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1369                 dev_kfree_skb(skb);
1370         }
1371
1372         /* Complete frame has been reassembled - process it now */
1373         rx->flags |= IEEE80211_RX_FRAGMENTED;
1374
1375  out:
1376         if (rx->sta)
1377                 rx->sta->rx_packets++;
1378         if (is_multicast_ether_addr(hdr->addr1))
1379                 rx->local->dot11MulticastReceivedFrameCount++;
1380         else
1381                 ieee80211_led_rx(rx->local);
1382         return RX_CONTINUE;
1383 }
1384
1385 static ieee80211_rx_result debug_noinline
1386 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1387 {
1388         struct ieee80211_sub_if_data *sdata = rx->sdata;
1389         __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1390
1391         if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1392                    !(rx->flags & IEEE80211_RX_RA_MATCH)))
1393                 return RX_CONTINUE;
1394
1395         if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1396             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1397                 return RX_DROP_UNUSABLE;
1398
1399         if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1400                 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1401         else
1402                 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1403
1404         /* Free PS Poll skb here instead of returning RX_DROP that would
1405          * count as an dropped frame. */
1406         dev_kfree_skb(rx->skb);
1407
1408         return RX_QUEUED;
1409 }
1410
1411 static ieee80211_rx_result debug_noinline
1412 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1413 {
1414         u8 *data = rx->skb->data;
1415         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1416
1417         if (!ieee80211_is_data_qos(hdr->frame_control))
1418                 return RX_CONTINUE;
1419
1420         /* remove the qos control field, update frame type and meta-data */
1421         memmove(data + IEEE80211_QOS_CTL_LEN, data,
1422                 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1423         hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1424         /* change frame type to non QOS */
1425         hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1426
1427         return RX_CONTINUE;
1428 }
1429
1430 static int
1431 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1432 {
1433         if (unlikely(!rx->sta ||
1434             !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1435                 return -EACCES;
1436
1437         return 0;
1438 }
1439
1440 static int
1441 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1442 {
1443         struct sk_buff *skb = rx->skb;
1444         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1445
1446         /*
1447          * Pass through unencrypted frames if the hardware has
1448          * decrypted them already.
1449          */
1450         if (status->flag & RX_FLAG_DECRYPTED)
1451                 return 0;
1452
1453         /* Drop unencrypted frames if key is set. */
1454         if (unlikely(!ieee80211_has_protected(fc) &&
1455                      !ieee80211_is_nullfunc(fc) &&
1456                      ieee80211_is_data(fc) &&
1457                      (rx->key || rx->sdata->drop_unencrypted)))
1458                 return -EACCES;
1459
1460         return 0;
1461 }
1462
1463 static int
1464 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1465 {
1466         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1467         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1468         __le16 fc = hdr->frame_control;
1469
1470         /*
1471          * Pass through unencrypted frames if the hardware has
1472          * decrypted them already.
1473          */
1474         if (status->flag & RX_FLAG_DECRYPTED)
1475                 return 0;
1476
1477         if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1478                 if (unlikely(!ieee80211_has_protected(fc) &&
1479                              ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1480                              rx->key))
1481                         return -EACCES;
1482                 /* BIP does not use Protected field, so need to check MMIE */
1483                 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1484                              ieee80211_get_mmie_keyidx(rx->skb) < 0))
1485                         return -EACCES;
1486                 /*
1487                  * When using MFP, Action frames are not allowed prior to
1488                  * having configured keys.
1489                  */
1490                 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1491                              ieee80211_is_robust_mgmt_frame(
1492                                      (struct ieee80211_hdr *) rx->skb->data)))
1493                         return -EACCES;
1494         }
1495
1496         return 0;
1497 }
1498
1499 static int
1500 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1501 {
1502         struct ieee80211_sub_if_data *sdata = rx->sdata;
1503         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1504
1505         if (ieee80211_has_a4(hdr->frame_control) &&
1506             sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1507                 return -1;
1508
1509         if (is_multicast_ether_addr(hdr->addr1) &&
1510             ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1511              (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
1512                 return -1;
1513
1514         return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1515 }
1516
1517 /*
1518  * requires that rx->skb is a frame with ethernet header
1519  */
1520 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1521 {
1522         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1523                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1524         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1525
1526         /*
1527          * Allow EAPOL frames to us/the PAE group address regardless
1528          * of whether the frame was encrypted or not.
1529          */
1530         if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1531             (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1532              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1533                 return true;
1534
1535         if (ieee80211_802_1x_port_control(rx) ||
1536             ieee80211_drop_unencrypted(rx, fc))
1537                 return false;
1538
1539         return true;
1540 }
1541
1542 /*
1543  * requires that rx->skb is a frame with ethernet header
1544  */
1545 static void
1546 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1547 {
1548         struct ieee80211_sub_if_data *sdata = rx->sdata;
1549         struct net_device *dev = sdata->dev;
1550         struct sk_buff *skb, *xmit_skb;
1551         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1552         struct sta_info *dsta;
1553
1554         skb = rx->skb;
1555         xmit_skb = NULL;
1556
1557         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1558              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1559             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1560             (rx->flags & IEEE80211_RX_RA_MATCH) &&
1561             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1562                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1563                         /*
1564                          * send multicast frames both to higher layers in
1565                          * local net stack and back to the wireless medium
1566                          */
1567                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1568                         if (!xmit_skb && net_ratelimit())
1569                                 printk(KERN_DEBUG "%s: failed to clone "
1570                                        "multicast frame\n", dev->name);
1571                 } else {
1572                         dsta = sta_info_get(sdata, skb->data);
1573                         if (dsta) {
1574                                 /*
1575                                  * The destination station is associated to
1576                                  * this AP (in this VLAN), so send the frame
1577                                  * directly to it and do not pass it to local
1578                                  * net stack.
1579                                  */
1580                                 xmit_skb = skb;
1581                                 skb = NULL;
1582                         }
1583                 }
1584         }
1585
1586         if (skb) {
1587                 int align __maybe_unused;
1588
1589 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1590                 /*
1591                  * 'align' will only take the values 0 or 2 here
1592                  * since all frames are required to be aligned
1593                  * to 2-byte boundaries when being passed to
1594                  * mac80211. That also explains the __skb_push()
1595                  * below.
1596                  */
1597                 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1598                 if (align) {
1599                         if (WARN_ON(skb_headroom(skb) < 3)) {
1600                                 dev_kfree_skb(skb);
1601                                 skb = NULL;
1602                         } else {
1603                                 u8 *data = skb->data;
1604                                 size_t len = skb_headlen(skb);
1605                                 skb->data -= align;
1606                                 memmove(skb->data, data, len);
1607                                 skb_set_tail_pointer(skb, len);
1608                         }
1609                 }
1610 #endif
1611
1612                 if (skb) {
1613                         /* deliver to local stack */
1614                         skb->protocol = eth_type_trans(skb, dev);
1615                         memset(skb->cb, 0, sizeof(skb->cb));
1616                         netif_receive_skb(skb);
1617                 }
1618         }
1619
1620         if (xmit_skb) {
1621                 /* send to wireless media */
1622                 xmit_skb->protocol = htons(ETH_P_802_3);
1623                 skb_reset_network_header(xmit_skb);
1624                 skb_reset_mac_header(xmit_skb);
1625                 dev_queue_xmit(xmit_skb);
1626         }
1627 }
1628
1629 static ieee80211_rx_result debug_noinline
1630 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1631 {
1632         struct net_device *dev = rx->sdata->dev;
1633         struct sk_buff *skb = rx->skb;
1634         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1635         __le16 fc = hdr->frame_control;
1636         struct sk_buff_head frame_list;
1637
1638         if (unlikely(!ieee80211_is_data(fc)))
1639                 return RX_CONTINUE;
1640
1641         if (unlikely(!ieee80211_is_data_present(fc)))
1642                 return RX_DROP_MONITOR;
1643
1644         if (!(rx->flags & IEEE80211_RX_AMSDU))
1645                 return RX_CONTINUE;
1646
1647         if (ieee80211_has_a4(hdr->frame_control) &&
1648             rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1649             !rx->sdata->u.vlan.sta)
1650                 return RX_DROP_UNUSABLE;
1651
1652         if (is_multicast_ether_addr(hdr->addr1) &&
1653             ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1654               rx->sdata->u.vlan.sta) ||
1655              (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1656               rx->sdata->u.mgd.use_4addr)))
1657                 return RX_DROP_UNUSABLE;
1658
1659         skb->dev = dev;
1660         __skb_queue_head_init(&frame_list);
1661
1662         if (skb_linearize(skb))
1663                 return RX_DROP_UNUSABLE;
1664
1665         ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1666                                  rx->sdata->vif.type,
1667                                  rx->local->hw.extra_tx_headroom);
1668
1669         while (!skb_queue_empty(&frame_list)) {
1670                 rx->skb = __skb_dequeue(&frame_list);
1671
1672                 if (!ieee80211_frame_allowed(rx, fc)) {
1673                         dev_kfree_skb(rx->skb);
1674                         continue;
1675                 }
1676                 dev->stats.rx_packets++;
1677                 dev->stats.rx_bytes += rx->skb->len;
1678
1679                 ieee80211_deliver_skb(rx);
1680         }
1681
1682         return RX_QUEUED;
1683 }
1684
1685 #ifdef CONFIG_MAC80211_MESH
1686 static ieee80211_rx_result
1687 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1688 {
1689         struct ieee80211_hdr *hdr;
1690         struct ieee80211s_hdr *mesh_hdr;
1691         unsigned int hdrlen;
1692         struct sk_buff *skb = rx->skb, *fwd_skb;
1693         struct ieee80211_local *local = rx->local;
1694         struct ieee80211_sub_if_data *sdata = rx->sdata;
1695
1696         hdr = (struct ieee80211_hdr *) skb->data;
1697         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1698         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1699
1700         if (!ieee80211_is_data(hdr->frame_control))
1701                 return RX_CONTINUE;
1702
1703         if (!mesh_hdr->ttl)
1704                 /* illegal frame */
1705                 return RX_DROP_MONITOR;
1706
1707         if (mesh_hdr->flags & MESH_FLAGS_AE) {
1708                 struct mesh_path *mppath;
1709                 char *proxied_addr;
1710                 char *mpp_addr;
1711
1712                 if (is_multicast_ether_addr(hdr->addr1)) {
1713                         mpp_addr = hdr->addr3;
1714                         proxied_addr = mesh_hdr->eaddr1;
1715                 } else {
1716                         mpp_addr = hdr->addr4;
1717                         proxied_addr = mesh_hdr->eaddr2;
1718                 }
1719
1720                 rcu_read_lock();
1721                 mppath = mpp_path_lookup(proxied_addr, sdata);
1722                 if (!mppath) {
1723                         mpp_path_add(proxied_addr, mpp_addr, sdata);
1724                 } else {
1725                         spin_lock_bh(&mppath->state_lock);
1726                         if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1727                                 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1728                         spin_unlock_bh(&mppath->state_lock);
1729                 }
1730                 rcu_read_unlock();
1731         }
1732
1733         /* Frame has reached destination.  Don't forward */
1734         if (!is_multicast_ether_addr(hdr->addr1) &&
1735             compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
1736                 return RX_CONTINUE;
1737
1738         mesh_hdr->ttl--;
1739
1740         if (rx->flags & IEEE80211_RX_RA_MATCH) {
1741                 if (!mesh_hdr->ttl)
1742                         IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1743                                                      dropped_frames_ttl);
1744                 else {
1745                         struct ieee80211_hdr *fwd_hdr;
1746                         struct ieee80211_tx_info *info;
1747
1748                         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1749
1750                         if (!fwd_skb && net_ratelimit())
1751                                 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1752                                                    sdata->name);
1753
1754                         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1755                         memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1756                         info = IEEE80211_SKB_CB(fwd_skb);
1757                         memset(info, 0, sizeof(*info));
1758                         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1759                         info->control.vif = &rx->sdata->vif;
1760                         skb_set_queue_mapping(skb,
1761                                 ieee80211_select_queue(rx->sdata, fwd_skb));
1762                         ieee80211_set_qos_hdr(local, skb);
1763                         if (is_multicast_ether_addr(fwd_hdr->addr1))
1764                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1765                                                                 fwded_mcast);
1766                         else {
1767                                 int err;
1768                                 /*
1769                                  * Save TA to addr1 to send TA a path error if a
1770                                  * suitable next hop is not found
1771                                  */
1772                                 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
1773                                                 ETH_ALEN);
1774                                 err = mesh_nexthop_lookup(fwd_skb, sdata);
1775                                 /* Failed to immediately resolve next hop:
1776                                  * fwded frame was dropped or will be added
1777                                  * later to the pending skb queue.  */
1778                                 if (err)
1779                                         return RX_DROP_MONITOR;
1780
1781                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1782                                                                 fwded_unicast);
1783                         }
1784                         IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1785                                                      fwded_frames);
1786                         ieee80211_add_pending_skb(local, fwd_skb);
1787                 }
1788         }
1789
1790         if (is_multicast_ether_addr(hdr->addr1) ||
1791             sdata->dev->flags & IFF_PROMISC)
1792                 return RX_CONTINUE;
1793         else
1794                 return RX_DROP_MONITOR;
1795 }
1796 #endif
1797
1798 static ieee80211_rx_result debug_noinline
1799 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1800 {
1801         struct ieee80211_sub_if_data *sdata = rx->sdata;
1802         struct ieee80211_local *local = rx->local;
1803         struct net_device *dev = sdata->dev;
1804         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1805         __le16 fc = hdr->frame_control;
1806         int err;
1807
1808         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1809                 return RX_CONTINUE;
1810
1811         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1812                 return RX_DROP_MONITOR;
1813
1814         /*
1815          * Allow the cooked monitor interface of an AP to see 4-addr frames so
1816          * that a 4-addr station can be detected and moved into a separate VLAN
1817          */
1818         if (ieee80211_has_a4(hdr->frame_control) &&
1819             sdata->vif.type == NL80211_IFTYPE_AP)
1820                 return RX_DROP_MONITOR;
1821
1822         err = __ieee80211_data_to_8023(rx);
1823         if (unlikely(err))
1824                 return RX_DROP_UNUSABLE;
1825
1826         if (!ieee80211_frame_allowed(rx, fc))
1827                 return RX_DROP_MONITOR;
1828
1829         rx->skb->dev = dev;
1830
1831         dev->stats.rx_packets++;
1832         dev->stats.rx_bytes += rx->skb->len;
1833
1834         if (ieee80211_is_data(hdr->frame_control) &&
1835             !is_multicast_ether_addr(hdr->addr1) &&
1836             local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1837                         mod_timer(&local->dynamic_ps_timer, jiffies +
1838                          msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1839         }
1840
1841         ieee80211_deliver_skb(rx);
1842
1843         return RX_QUEUED;
1844 }
1845
1846 static ieee80211_rx_result debug_noinline
1847 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
1848 {
1849         struct ieee80211_local *local = rx->local;
1850         struct ieee80211_hw *hw = &local->hw;
1851         struct sk_buff *skb = rx->skb;
1852         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1853         struct tid_ampdu_rx *tid_agg_rx;
1854         u16 start_seq_num;
1855         u16 tid;
1856
1857         if (likely(!ieee80211_is_ctl(bar->frame_control)))
1858                 return RX_CONTINUE;
1859
1860         if (ieee80211_is_back_req(bar->frame_control)) {
1861                 struct {
1862                         __le16 control, start_seq_num;
1863                 } __packed bar_data;
1864
1865                 if (!rx->sta)
1866                         return RX_DROP_MONITOR;
1867
1868                 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1869                                   &bar_data, sizeof(bar_data)))
1870                         return RX_DROP_MONITOR;
1871
1872                 tid = le16_to_cpu(bar_data.control) >> 12;
1873
1874                 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1875                 if (!tid_agg_rx)
1876                         return RX_DROP_MONITOR;
1877
1878                 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
1879
1880                 /* reset session timer */
1881                 if (tid_agg_rx->timeout)
1882                         mod_timer(&tid_agg_rx->session_timer,
1883                                   TU_TO_EXP_TIME(tid_agg_rx->timeout));
1884
1885                 /* release stored frames up to start of BAR */
1886                 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1887                                                  frames);
1888                 kfree_skb(skb);
1889                 return RX_QUEUED;
1890         }
1891
1892         /*
1893          * After this point, we only want management frames,
1894          * so we can drop all remaining control frames to
1895          * cooked monitor interfaces.
1896          */
1897         return RX_DROP_MONITOR;
1898 }
1899
1900 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1901                                            struct ieee80211_mgmt *mgmt,
1902                                            size_t len)
1903 {
1904         struct ieee80211_local *local = sdata->local;
1905         struct sk_buff *skb;
1906         struct ieee80211_mgmt *resp;
1907
1908         if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
1909                 /* Not to own unicast address */
1910                 return;
1911         }
1912
1913         if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1914             compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1915                 /* Not from the current AP or not associated yet. */
1916                 return;
1917         }
1918
1919         if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1920                 /* Too short SA Query request frame */
1921                 return;
1922         }
1923
1924         skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1925         if (skb == NULL)
1926                 return;
1927
1928         skb_reserve(skb, local->hw.extra_tx_headroom);
1929         resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1930         memset(resp, 0, 24);
1931         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1932         memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
1933         memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1934         resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1935                                           IEEE80211_STYPE_ACTION);
1936         skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1937         resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1938         resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1939         memcpy(resp->u.action.u.sa_query.trans_id,
1940                mgmt->u.action.u.sa_query.trans_id,
1941                WLAN_SA_QUERY_TR_ID_LEN);
1942
1943         ieee80211_tx_skb(sdata, skb);
1944 }
1945
1946 static ieee80211_rx_result debug_noinline
1947 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1948 {
1949         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1950
1951         /*
1952          * From here on, look only at management frames.
1953          * Data and control frames are already handled,
1954          * and unknown (reserved) frames are useless.
1955          */
1956         if (rx->skb->len < 24)
1957                 return RX_DROP_MONITOR;
1958
1959         if (!ieee80211_is_mgmt(mgmt->frame_control))
1960                 return RX_DROP_MONITOR;
1961
1962         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1963                 return RX_DROP_MONITOR;
1964
1965         if (ieee80211_drop_unencrypted_mgmt(rx))
1966                 return RX_DROP_UNUSABLE;
1967
1968         return RX_CONTINUE;
1969 }
1970
1971 static ieee80211_rx_result debug_noinline
1972 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1973 {
1974         struct ieee80211_local *local = rx->local;
1975         struct ieee80211_sub_if_data *sdata = rx->sdata;
1976         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1977         int len = rx->skb->len;
1978
1979         if (!ieee80211_is_action(mgmt->frame_control))
1980                 return RX_CONTINUE;
1981
1982         /* drop too small frames */
1983         if (len < IEEE80211_MIN_ACTION_SIZE)
1984                 return RX_DROP_UNUSABLE;
1985
1986         if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
1987                 return RX_DROP_UNUSABLE;
1988
1989         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1990                 return RX_DROP_UNUSABLE;
1991
1992         switch (mgmt->u.action.category) {
1993         case WLAN_CATEGORY_BACK:
1994                 /*
1995                  * The aggregation code is not prepared to handle
1996                  * anything but STA/AP due to the BSSID handling;
1997                  * IBSS could work in the code but isn't supported
1998                  * by drivers or the standard.
1999                  */
2000                 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2001                     sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2002                     sdata->vif.type != NL80211_IFTYPE_AP)
2003                         break;
2004
2005                 /* verify action_code is present */
2006                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2007                         break;
2008
2009                 switch (mgmt->u.action.u.addba_req.action_code) {
2010                 case WLAN_ACTION_ADDBA_REQ:
2011                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2012                                    sizeof(mgmt->u.action.u.addba_req)))
2013                                 goto invalid;
2014                         break;
2015                 case WLAN_ACTION_ADDBA_RESP:
2016                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2017                                    sizeof(mgmt->u.action.u.addba_resp)))
2018                                 goto invalid;
2019                         break;
2020                 case WLAN_ACTION_DELBA:
2021                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2022                                    sizeof(mgmt->u.action.u.delba)))
2023                                 goto invalid;
2024                         break;
2025                 default:
2026                         goto invalid;
2027                 }
2028
2029                 goto queue;
2030         case WLAN_CATEGORY_SPECTRUM_MGMT:
2031                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2032                         break;
2033
2034                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2035                         break;
2036
2037                 /* verify action_code is present */
2038                 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2039                         break;
2040
2041                 switch (mgmt->u.action.u.measurement.action_code) {
2042                 case WLAN_ACTION_SPCT_MSR_REQ:
2043                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2044                                    sizeof(mgmt->u.action.u.measurement)))
2045                                 break;
2046                         ieee80211_process_measurement_req(sdata, mgmt, len);
2047                         goto handled;
2048                 case WLAN_ACTION_SPCT_CHL_SWITCH:
2049                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2050                                    sizeof(mgmt->u.action.u.chan_switch)))
2051                                 break;
2052
2053                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2054                                 break;
2055
2056                         if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
2057                                 break;
2058
2059                         goto queue;
2060                 }
2061                 break;
2062         case WLAN_CATEGORY_SA_QUERY:
2063                 if (len < (IEEE80211_MIN_ACTION_SIZE +
2064                            sizeof(mgmt->u.action.u.sa_query)))
2065                         break;
2066
2067                 switch (mgmt->u.action.u.sa_query.action) {
2068                 case WLAN_ACTION_SA_QUERY_REQUEST:
2069                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2070                                 break;
2071                         ieee80211_process_sa_query_req(sdata, mgmt, len);
2072                         goto handled;
2073                 }
2074                 break;
2075         case WLAN_CATEGORY_MESH_PLINK:
2076         case WLAN_CATEGORY_MESH_PATH_SEL:
2077                 if (!ieee80211_vif_is_mesh(&sdata->vif))
2078                         break;
2079                 goto queue;
2080         }
2081
2082         return RX_CONTINUE;
2083
2084  invalid:
2085         rx->flags |= IEEE80211_MALFORMED_ACTION_FRM;
2086         /* will return in the next handlers */
2087         return RX_CONTINUE;
2088
2089  handled:
2090         if (rx->sta)
2091                 rx->sta->rx_packets++;
2092         dev_kfree_skb(rx->skb);
2093         return RX_QUEUED;
2094
2095  queue:
2096         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2097         skb_queue_tail(&sdata->skb_queue, rx->skb);
2098         ieee80211_queue_work(&local->hw, &sdata->work);
2099         if (rx->sta)
2100                 rx->sta->rx_packets++;
2101         return RX_QUEUED;
2102 }
2103
2104 static ieee80211_rx_result debug_noinline
2105 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2106 {
2107         struct ieee80211_rx_status *status;
2108
2109         /* skip known-bad action frames and return them in the next handler */
2110         if (rx->flags & IEEE80211_MALFORMED_ACTION_FRM)
2111                 return RX_CONTINUE;
2112
2113         /*
2114          * Getting here means the kernel doesn't know how to handle
2115          * it, but maybe userspace does ... include returned frames
2116          * so userspace can register for those to know whether ones
2117          * it transmitted were processed or returned.
2118          */
2119         status = IEEE80211_SKB_RXCB(rx->skb);
2120
2121         if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2122                              rx->skb->data, rx->skb->len,
2123                              GFP_ATOMIC)) {
2124                 if (rx->sta)
2125                         rx->sta->rx_packets++;
2126                 dev_kfree_skb(rx->skb);
2127                 return RX_QUEUED;
2128         }
2129
2130
2131         return RX_CONTINUE;
2132 }
2133
2134 static ieee80211_rx_result debug_noinline
2135 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2136 {
2137         struct ieee80211_local *local = rx->local;
2138         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2139         struct sk_buff *nskb;
2140         struct ieee80211_sub_if_data *sdata = rx->sdata;
2141
2142         if (!ieee80211_is_action(mgmt->frame_control))
2143                 return RX_CONTINUE;
2144
2145         /*
2146          * For AP mode, hostapd is responsible for handling any action
2147          * frames that we didn't handle, including returning unknown
2148          * ones. For all other modes we will return them to the sender,
2149          * setting the 0x80 bit in the action category, as required by
2150          * 802.11-2007 7.3.1.11.
2151          * Newer versions of hostapd shall also use the management frame
2152          * registration mechanisms, but older ones still use cooked
2153          * monitor interfaces so push all frames there.
2154          */
2155         if (!(rx->flags & IEEE80211_MALFORMED_ACTION_FRM) &&
2156             (sdata->vif.type == NL80211_IFTYPE_AP ||
2157              sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2158                 return RX_DROP_MONITOR;
2159
2160         /* do not return rejected action frames */
2161         if (mgmt->u.action.category & 0x80)
2162                 return RX_DROP_UNUSABLE;
2163
2164         nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2165                                GFP_ATOMIC);
2166         if (nskb) {
2167                 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2168
2169                 nmgmt->u.action.category |= 0x80;
2170                 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2171                 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2172
2173                 memset(nskb->cb, 0, sizeof(nskb->cb));
2174
2175                 ieee80211_tx_skb(rx->sdata, nskb);
2176         }
2177         dev_kfree_skb(rx->skb);
2178         return RX_QUEUED;
2179 }
2180
2181 static ieee80211_rx_result debug_noinline
2182 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2183 {
2184         struct ieee80211_sub_if_data *sdata = rx->sdata;
2185         ieee80211_rx_result rxs;
2186         struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2187         __le16 stype;
2188
2189         rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2190         if (rxs != RX_CONTINUE)
2191                 return rxs;
2192
2193         stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2194
2195         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2196             sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2197             sdata->vif.type != NL80211_IFTYPE_STATION)
2198                 return RX_DROP_MONITOR;
2199
2200         switch (stype) {
2201         case cpu_to_le16(IEEE80211_STYPE_BEACON):
2202         case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2203                 /* process for all: mesh, mlme, ibss */
2204                 break;
2205         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2206         case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2207                 /* process only for station */
2208                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2209                         return RX_DROP_MONITOR;
2210                 break;
2211         case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2212         case cpu_to_le16(IEEE80211_STYPE_AUTH):
2213                 /* process only for ibss */
2214                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2215                         return RX_DROP_MONITOR;
2216                 break;
2217         default:
2218                 return RX_DROP_MONITOR;
2219         }
2220
2221         /* queue up frame and kick off work to process it */
2222         rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2223         skb_queue_tail(&sdata->skb_queue, rx->skb);
2224         ieee80211_queue_work(&rx->local->hw, &sdata->work);
2225         if (rx->sta)
2226                 rx->sta->rx_packets++;
2227
2228         return RX_QUEUED;
2229 }
2230
2231 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
2232                                             struct ieee80211_rx_data *rx)
2233 {
2234         int keyidx;
2235         unsigned int hdrlen;
2236
2237         hdrlen = ieee80211_hdrlen(hdr->frame_control);
2238         if (rx->skb->len >= hdrlen + 4)
2239                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2240         else
2241                 keyidx = -1;
2242
2243         if (!rx->sta) {
2244                 /*
2245                  * Some hardware seem to generate incorrect Michael MIC
2246                  * reports; ignore them to avoid triggering countermeasures.
2247                  */
2248                 return;
2249         }
2250
2251         if (!ieee80211_has_protected(hdr->frame_control))
2252                 return;
2253
2254         if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
2255                 /*
2256                  * APs with pairwise keys should never receive Michael MIC
2257                  * errors for non-zero keyidx because these are reserved for
2258                  * group keys and only the AP is sending real multicast
2259                  * frames in the BSS.
2260                  */
2261                 return;
2262         }
2263
2264         if (!ieee80211_is_data(hdr->frame_control) &&
2265             !ieee80211_is_auth(hdr->frame_control))
2266                 return;
2267
2268         mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2269                                         GFP_ATOMIC);
2270 }
2271
2272 /* TODO: use IEEE80211_RX_FRAGMENTED */
2273 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2274                                         struct ieee80211_rate *rate)
2275 {
2276         struct ieee80211_sub_if_data *sdata;
2277         struct ieee80211_local *local = rx->local;
2278         struct ieee80211_rtap_hdr {
2279                 struct ieee80211_radiotap_header hdr;
2280                 u8 flags;
2281                 u8 rate_or_pad;
2282                 __le16 chan_freq;
2283                 __le16 chan_flags;
2284         } __packed *rthdr;
2285         struct sk_buff *skb = rx->skb, *skb2;
2286         struct net_device *prev_dev = NULL;
2287         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2288
2289         if (status->flag & RX_FLAG_INTERNAL_CMTR)
2290                 goto out_free_skb;
2291
2292         if (skb_headroom(skb) < sizeof(*rthdr) &&
2293             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2294                 goto out_free_skb;
2295
2296         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2297         memset(rthdr, 0, sizeof(*rthdr));
2298         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2299         rthdr->hdr.it_present =
2300                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2301                             (1 << IEEE80211_RADIOTAP_CHANNEL));
2302
2303         if (rate) {
2304                 rthdr->rate_or_pad = rate->bitrate / 5;
2305                 rthdr->hdr.it_present |=
2306                         cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2307         }
2308         rthdr->chan_freq = cpu_to_le16(status->freq);
2309
2310         if (status->band == IEEE80211_BAND_5GHZ)
2311                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2312                                                 IEEE80211_CHAN_5GHZ);
2313         else
2314                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2315                                                 IEEE80211_CHAN_2GHZ);
2316
2317         skb_set_mac_header(skb, 0);
2318         skb->ip_summed = CHECKSUM_UNNECESSARY;
2319         skb->pkt_type = PACKET_OTHERHOST;
2320         skb->protocol = htons(ETH_P_802_2);
2321
2322         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2323                 if (!ieee80211_sdata_running(sdata))
2324                         continue;
2325
2326                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2327                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2328                         continue;
2329
2330                 if (prev_dev) {
2331                         skb2 = skb_clone(skb, GFP_ATOMIC);
2332                         if (skb2) {
2333                                 skb2->dev = prev_dev;
2334                                 netif_receive_skb(skb2);
2335                         }
2336                 }
2337
2338                 prev_dev = sdata->dev;
2339                 sdata->dev->stats.rx_packets++;
2340                 sdata->dev->stats.rx_bytes += skb->len;
2341         }
2342
2343         if (prev_dev) {
2344                 skb->dev = prev_dev;
2345                 netif_receive_skb(skb);
2346                 skb = NULL;
2347         } else
2348                 goto out_free_skb;
2349
2350         status->flag |= RX_FLAG_INTERNAL_CMTR;
2351         return;
2352
2353  out_free_skb:
2354         dev_kfree_skb(skb);
2355 }
2356
2357 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2358                                          ieee80211_rx_result res)
2359 {
2360         switch (res) {
2361         case RX_DROP_MONITOR:
2362                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2363                 if (rx->sta)
2364                         rx->sta->rx_dropped++;
2365                 /* fall through */
2366         case RX_CONTINUE: {
2367                 struct ieee80211_rate *rate = NULL;
2368                 struct ieee80211_supported_band *sband;
2369                 struct ieee80211_rx_status *status;
2370
2371                 status = IEEE80211_SKB_RXCB((rx->skb));
2372
2373                 sband = rx->local->hw.wiphy->bands[status->band];
2374                 if (!(status->flag & RX_FLAG_HT))
2375                         rate = &sband->bitrates[status->rate_idx];
2376
2377                 ieee80211_rx_cooked_monitor(rx, rate);
2378                 break;
2379                 }
2380         case RX_DROP_UNUSABLE:
2381                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2382                 if (rx->sta)
2383                         rx->sta->rx_dropped++;
2384                 dev_kfree_skb(rx->skb);
2385                 break;
2386         case RX_QUEUED:
2387                 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2388                 break;
2389         }
2390 }
2391
2392 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2393                                   struct sk_buff_head *frames)
2394 {
2395         ieee80211_rx_result res = RX_DROP_MONITOR;
2396         struct sk_buff *skb;
2397
2398 #define CALL_RXH(rxh)                   \
2399         do {                            \
2400                 res = rxh(rx);          \
2401                 if (res != RX_CONTINUE) \
2402                         goto rxh_next;  \
2403         } while (0);
2404
2405         while ((skb = __skb_dequeue(frames))) {
2406                 /*
2407                  * all the other fields are valid across frames
2408                  * that belong to an aMPDU since they are on the
2409                  * same TID from the same station
2410                  */
2411                 rx->skb = skb;
2412
2413                 CALL_RXH(ieee80211_rx_h_decrypt)
2414                 CALL_RXH(ieee80211_rx_h_check_more_data)
2415                 CALL_RXH(ieee80211_rx_h_sta_process)
2416                 CALL_RXH(ieee80211_rx_h_defragment)
2417                 CALL_RXH(ieee80211_rx_h_ps_poll)
2418                 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2419                 /* must be after MMIC verify so header is counted in MPDU mic */
2420                 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2421                 CALL_RXH(ieee80211_rx_h_amsdu)
2422 #ifdef CONFIG_MAC80211_MESH
2423                 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2424                         CALL_RXH(ieee80211_rx_h_mesh_fwding);
2425 #endif
2426                 CALL_RXH(ieee80211_rx_h_data)
2427
2428                 /* special treatment -- needs the queue */
2429                 res = ieee80211_rx_h_ctrl(rx, frames);
2430                 if (res != RX_CONTINUE)
2431                         goto rxh_next;
2432
2433                 CALL_RXH(ieee80211_rx_h_mgmt_check)
2434                 CALL_RXH(ieee80211_rx_h_action)
2435                 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2436                 CALL_RXH(ieee80211_rx_h_action_return)
2437                 CALL_RXH(ieee80211_rx_h_mgmt)
2438
2439  rxh_next:
2440                 ieee80211_rx_handlers_result(rx, res);
2441
2442 #undef CALL_RXH
2443         }
2444 }
2445
2446 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2447                                          struct ieee80211_rx_data *rx,
2448                                          struct sk_buff *skb)
2449 {
2450         struct sk_buff_head reorder_release;
2451         ieee80211_rx_result res = RX_DROP_MONITOR;
2452
2453         __skb_queue_head_init(&reorder_release);
2454
2455         rx->skb = skb;
2456         rx->sdata = sdata;
2457
2458 #define CALL_RXH(rxh)                   \
2459         do {                            \
2460                 res = rxh(rx);          \
2461                 if (res != RX_CONTINUE) \
2462                         goto rxh_next;  \
2463         } while (0);
2464
2465         CALL_RXH(ieee80211_rx_h_passive_scan)
2466         CALL_RXH(ieee80211_rx_h_check)
2467
2468         ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2469
2470         ieee80211_rx_handlers(rx, &reorder_release);
2471         return;
2472
2473  rxh_next:
2474         ieee80211_rx_handlers_result(rx, res);
2475
2476 #undef CALL_RXH
2477 }
2478
2479 /*
2480  * This function makes calls into the RX path. Therefore the
2481  * caller must hold the sta_info->lock and everything has to
2482  * be under rcu_read_lock protection as well.
2483  */
2484 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2485 {
2486         struct sk_buff_head frames;
2487         struct ieee80211_rx_data rx = { };
2488         struct tid_ampdu_rx *tid_agg_rx;
2489
2490         tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2491         if (!tid_agg_rx)
2492                 return;
2493
2494         __skb_queue_head_init(&frames);
2495
2496         /* construct rx struct */
2497         rx.sta = sta;
2498         rx.sdata = sta->sdata;
2499         rx.local = sta->local;
2500         rx.queue = tid;
2501         rx.flags |= IEEE80211_RX_RA_MATCH;
2502
2503         if (unlikely(test_bit(SCAN_HW_SCANNING, &sta->local->scanning) ||
2504                      test_bit(SCAN_OFF_CHANNEL, &sta->local->scanning)))
2505                 rx.flags |= IEEE80211_RX_IN_SCAN;
2506
2507         spin_lock(&tid_agg_rx->reorder_lock);
2508         ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2509         spin_unlock(&tid_agg_rx->reorder_lock);
2510
2511         ieee80211_rx_handlers(&rx, &frames);
2512 }
2513
2514 /* main receive path */
2515
2516 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2517                                 struct ieee80211_rx_data *rx,
2518                                 struct ieee80211_hdr *hdr)
2519 {
2520         struct sk_buff *skb = rx->skb;
2521         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2522         u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2523         int multicast = is_multicast_ether_addr(hdr->addr1);
2524
2525         switch (sdata->vif.type) {
2526         case NL80211_IFTYPE_STATION:
2527                 if (!bssid && !sdata->u.mgd.use_4addr)
2528                         return 0;
2529                 if (!multicast &&
2530                     compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2531                         if (!(sdata->dev->flags & IFF_PROMISC))
2532                                 return 0;
2533                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
2534                 }
2535                 break;
2536         case NL80211_IFTYPE_ADHOC:
2537                 if (!bssid)
2538                         return 0;
2539                 if (ieee80211_is_beacon(hdr->frame_control)) {
2540                         return 1;
2541                 }
2542                 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2543                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2544                                 return 0;
2545                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
2546                 } else if (!multicast &&
2547                            compare_ether_addr(sdata->vif.addr,
2548                                               hdr->addr1) != 0) {
2549                         if (!(sdata->dev->flags & IFF_PROMISC))
2550                                 return 0;
2551                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
2552                 } else if (!rx->sta) {
2553                         int rate_idx;
2554                         if (status->flag & RX_FLAG_HT)
2555                                 rate_idx = 0; /* TODO: HT rates */
2556                         else
2557                                 rate_idx = status->rate_idx;
2558                         rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2559                                         hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
2560                 }
2561                 break;
2562         case NL80211_IFTYPE_MESH_POINT:
2563                 if (!multicast &&
2564                     compare_ether_addr(sdata->vif.addr,
2565                                        hdr->addr1) != 0) {
2566                         if (!(sdata->dev->flags & IFF_PROMISC))
2567                                 return 0;
2568
2569                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
2570                 }
2571                 break;
2572         case NL80211_IFTYPE_AP_VLAN:
2573         case NL80211_IFTYPE_AP:
2574                 if (!bssid) {
2575                         if (compare_ether_addr(sdata->vif.addr,
2576                                                hdr->addr1))
2577                                 return 0;
2578                 } else if (!ieee80211_bssid_match(bssid,
2579                                         sdata->vif.addr)) {
2580                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2581                                 return 0;
2582                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
2583                 }
2584                 break;
2585         case NL80211_IFTYPE_WDS:
2586                 if (bssid || !ieee80211_is_data(hdr->frame_control))
2587                         return 0;
2588                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2589                         return 0;
2590                 break;
2591         case NL80211_IFTYPE_MONITOR:
2592         case NL80211_IFTYPE_UNSPECIFIED:
2593         case NUM_NL80211_IFTYPES:
2594                 /* should never get here */
2595                 WARN_ON(1);
2596                 break;
2597         }
2598
2599         return 1;
2600 }
2601
2602 /*
2603  * This is the actual Rx frames handler. as it blongs to Rx path it must
2604  * be called with rcu_read_lock protection.
2605  */
2606 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2607                                          struct sk_buff *skb)
2608 {
2609         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2610         struct ieee80211_local *local = hw_to_local(hw);
2611         struct ieee80211_sub_if_data *sdata;
2612         struct ieee80211_hdr *hdr;
2613         __le16 fc;
2614         struct ieee80211_rx_data rx;
2615         int prepares;
2616         struct ieee80211_sub_if_data *prev = NULL;
2617         struct sk_buff *skb_new;
2618         struct sta_info *sta, *tmp;
2619         bool found_sta = false;
2620         int err = 0;
2621
2622         fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2623         memset(&rx, 0, sizeof(rx));
2624         rx.skb = skb;
2625         rx.local = local;
2626
2627         if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2628                 local->dot11ReceivedFragmentCount++;
2629
2630         if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2631                      test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
2632                 rx.flags |= IEEE80211_RX_IN_SCAN;
2633
2634         if (ieee80211_is_mgmt(fc))
2635                 err = skb_linearize(skb);
2636         else
2637                 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2638
2639         if (err) {
2640                 dev_kfree_skb(skb);
2641                 return;
2642         }
2643
2644         hdr = (struct ieee80211_hdr *)skb->data;
2645         ieee80211_parse_qos(&rx);
2646         ieee80211_verify_alignment(&rx);
2647
2648         if (ieee80211_is_data(fc)) {
2649                 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2650                         rx.sta = sta;
2651                         found_sta = true;
2652                         rx.sdata = sta->sdata;
2653
2654                         rx.flags |= IEEE80211_RX_RA_MATCH;
2655                         prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2656                         if (prepares) {
2657                                 if (status->flag & RX_FLAG_MMIC_ERROR) {
2658                                         if (rx.flags & IEEE80211_RX_RA_MATCH)
2659                                                 ieee80211_rx_michael_mic_report(hdr, &rx);
2660                                 } else
2661                                         prev = rx.sdata;
2662                         }
2663                 }
2664         }
2665         if (!found_sta) {
2666                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2667                         if (!ieee80211_sdata_running(sdata))
2668                                 continue;
2669
2670                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2671                             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2672                                 continue;
2673
2674                         /*
2675                          * frame is destined for this interface, but if it's
2676                          * not also for the previous one we handle that after
2677                          * the loop to avoid copying the SKB once too much
2678                          */
2679
2680                         if (!prev) {
2681                                 prev = sdata;
2682                                 continue;
2683                         }
2684
2685                         rx.sta = sta_info_get_bss(prev, hdr->addr2);
2686
2687                         rx.flags |= IEEE80211_RX_RA_MATCH;
2688                         prepares = prepare_for_handlers(prev, &rx, hdr);
2689
2690                         if (!prepares)
2691                                 goto next;
2692
2693                         if (status->flag & RX_FLAG_MMIC_ERROR) {
2694                                 rx.sdata = prev;
2695                                 if (rx.flags & IEEE80211_RX_RA_MATCH)
2696                                         ieee80211_rx_michael_mic_report(hdr,
2697                                                                         &rx);
2698                                 goto next;
2699                         }
2700
2701                         /*
2702                          * frame was destined for the previous interface
2703                          * so invoke RX handlers for it
2704                          */
2705
2706                         skb_new = skb_copy(skb, GFP_ATOMIC);
2707                         if (!skb_new) {
2708                                 if (net_ratelimit())
2709                                         wiphy_debug(local->hw.wiphy,
2710                                                     "failed to copy multicast frame for %s\n",
2711                                                     prev->name);
2712                                 goto next;
2713                         }
2714                         ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2715 next:
2716                         prev = sdata;
2717                 }
2718
2719                 if (prev) {
2720                         rx.sta = sta_info_get_bss(prev, hdr->addr2);
2721
2722                         rx.flags |= IEEE80211_RX_RA_MATCH;
2723                         prepares = prepare_for_handlers(prev, &rx, hdr);
2724
2725                         if (!prepares)
2726                                 prev = NULL;
2727                 }
2728         }
2729         if (prev)
2730                 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2731         else
2732                 dev_kfree_skb(skb);
2733 }
2734
2735 /*
2736  * This is the receive path handler. It is called by a low level driver when an
2737  * 802.11 MPDU is received from the hardware.
2738  */
2739 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2740 {
2741         struct ieee80211_local *local = hw_to_local(hw);
2742         struct ieee80211_rate *rate = NULL;
2743         struct ieee80211_supported_band *sband;
2744         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2745
2746         WARN_ON_ONCE(softirq_count() == 0);
2747
2748         if (WARN_ON(status->band < 0 ||
2749                     status->band >= IEEE80211_NUM_BANDS))
2750                 goto drop;
2751
2752         sband = local->hw.wiphy->bands[status->band];
2753         if (WARN_ON(!sband))
2754                 goto drop;
2755
2756         /*
2757          * If we're suspending, it is possible although not too likely
2758          * that we'd be receiving frames after having already partially
2759          * quiesced the stack. We can't process such frames then since
2760          * that might, for example, cause stations to be added or other
2761          * driver callbacks be invoked.
2762          */
2763         if (unlikely(local->quiescing || local->suspended))
2764                 goto drop;
2765
2766         /*
2767          * The same happens when we're not even started,
2768          * but that's worth a warning.
2769          */
2770         if (WARN_ON(!local->started))
2771                 goto drop;
2772
2773         if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
2774                 /*
2775                  * Validate the rate, unless a PLCP error means that
2776                  * we probably can't have a valid rate here anyway.
2777                  */
2778
2779                 if (status->flag & RX_FLAG_HT) {
2780                         /*
2781                          * rate_idx is MCS index, which can be [0-76]
2782                          * as documented on:
2783                          *
2784                          * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2785                          *
2786                          * Anything else would be some sort of driver or
2787                          * hardware error. The driver should catch hardware
2788                          * errors.
2789                          */
2790                         if (WARN((status->rate_idx < 0 ||
2791                                  status->rate_idx > 76),
2792                                  "Rate marked as an HT rate but passed "
2793                                  "status->rate_idx is not "
2794                                  "an MCS index [0-76]: %d (0x%02x)\n",
2795                                  status->rate_idx,
2796                                  status->rate_idx))
2797                                 goto drop;
2798                 } else {
2799                         if (WARN_ON(status->rate_idx < 0 ||
2800                                     status->rate_idx >= sband->n_bitrates))
2801                                 goto drop;
2802                         rate = &sband->bitrates[status->rate_idx];
2803                 }
2804         }
2805
2806         /*
2807          * key references and virtual interfaces are protected using RCU
2808          * and this requires that we are in a read-side RCU section during
2809          * receive processing
2810          */
2811         rcu_read_lock();
2812
2813         /*
2814          * Frames with failed FCS/PLCP checksum are not returned,
2815          * all other frames are returned without radiotap header
2816          * if it was previously present.
2817          * Also, frames with less than 16 bytes are dropped.
2818          */
2819         skb = ieee80211_rx_monitor(local, skb, rate);
2820         if (!skb) {
2821                 rcu_read_unlock();
2822                 return;
2823         }
2824
2825         __ieee80211_rx_handle_packet(hw, skb);
2826
2827         rcu_read_unlock();
2828
2829         return;
2830  drop:
2831         kfree_skb(skb);
2832 }
2833 EXPORT_SYMBOL(ieee80211_rx);
2834
2835 /* This is a version of the rx handler that can be called from hard irq
2836  * context. Post the skb on the queue and schedule the tasklet */
2837 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2838 {
2839         struct ieee80211_local *local = hw_to_local(hw);
2840
2841         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2842
2843         skb->pkt_type = IEEE80211_RX_MSG;
2844         skb_queue_tail(&local->skb_queue, skb);
2845         tasklet_schedule(&local->tasklet);
2846 }
2847 EXPORT_SYMBOL(ieee80211_rx_irqsafe);