Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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       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/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20
21 #include "ieee80211_i.h"
22 #include "led.h"
23 #include "mesh.h"
24 #include "wep.h"
25 #include "wpa.h"
26 #include "tkip.h"
27 #include "wme.h"
28
29 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30                                 struct tid_ampdu_rx *tid_agg_rx,
31                                 struct sk_buff *skb, u16 mpdu_seq_num,
32                                 int bar_req);
33 /*
34  * monitor mode reception
35  *
36  * This function cleans up the SKB, i.e. it removes all the stuff
37  * only useful for monitoring.
38  */
39 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40                                            struct sk_buff *skb,
41                                            int rtap_len)
42 {
43         skb_pull(skb, rtap_len);
44
45         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46                 if (likely(skb->len > FCS_LEN))
47                         skb_trim(skb, skb->len - FCS_LEN);
48                 else {
49                         /* driver bug */
50                         WARN_ON(1);
51                         dev_kfree_skb(skb);
52                         skb = NULL;
53                 }
54         }
55
56         return skb;
57 }
58
59 static inline int should_drop_frame(struct ieee80211_rx_status *status,
60                                     struct sk_buff *skb,
61                                     int present_fcs_len,
62                                     int radiotap_len)
63 {
64         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
65
66         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
67                 return 1;
68         if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
69                 return 1;
70         if (((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FTYPE)) ==
71                         cpu_to_le16(IEEE80211_FTYPE_CTL)) &&
72             ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
73                         cpu_to_le16(IEEE80211_STYPE_PSPOLL)) &&
74             ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE)) !=
75                         cpu_to_le16(IEEE80211_STYPE_BACK_REQ)))
76                 return 1;
77         return 0;
78 }
79
80 static int
81 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
82                           struct ieee80211_rx_status *status)
83 {
84         int len;
85
86         /* always present fields */
87         len = sizeof(struct ieee80211_radiotap_header) + 9;
88
89         if (status->flag & RX_FLAG_TSFT)
90                 len += 8;
91         if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
92             local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
93                 len += 1;
94         if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
95                 len += 1;
96
97         if (len & 1) /* padding for RX_FLAGS if necessary */
98                 len++;
99
100         /* make sure radiotap starts at a naturally aligned address */
101         if (len % 8)
102                 len = roundup(len, 8);
103
104         return len;
105 }
106
107 /**
108  * ieee80211_add_rx_radiotap_header - add radiotap header
109  *
110  * add a radiotap header containing all the fields which the hardware provided.
111  */
112 static void
113 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
114                                  struct sk_buff *skb,
115                                  struct ieee80211_rx_status *status,
116                                  struct ieee80211_rate *rate,
117                                  int rtap_len)
118 {
119         struct ieee80211_radiotap_header *rthdr;
120         unsigned char *pos;
121
122         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
123         memset(rthdr, 0, rtap_len);
124
125         /* radiotap header, set always present flags */
126         rthdr->it_present =
127                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
128                             (1 << IEEE80211_RADIOTAP_RATE) |
129                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
130                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
131                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
132         rthdr->it_len = cpu_to_le16(rtap_len);
133
134         pos = (unsigned char *)(rthdr+1);
135
136         /* the order of the following fields is important */
137
138         /* IEEE80211_RADIOTAP_TSFT */
139         if (status->flag & RX_FLAG_TSFT) {
140                 *(__le64 *)pos = cpu_to_le64(status->mactime);
141                 rthdr->it_present |=
142                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
143                 pos += 8;
144         }
145
146         /* IEEE80211_RADIOTAP_FLAGS */
147         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
148                 *pos |= IEEE80211_RADIOTAP_F_FCS;
149         pos++;
150
151         /* IEEE80211_RADIOTAP_RATE */
152         *pos = rate->bitrate / 5;
153         pos++;
154
155         /* IEEE80211_RADIOTAP_CHANNEL */
156         *(__le16 *)pos = cpu_to_le16(status->freq);
157         pos += 2;
158         if (status->band == IEEE80211_BAND_5GHZ)
159                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
160                                              IEEE80211_CHAN_5GHZ);
161         else
162                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_DYN |
163                                              IEEE80211_CHAN_2GHZ);
164         pos += 2;
165
166         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
167         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
168                 *pos = status->signal;
169                 rthdr->it_present |=
170                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
171                 pos++;
172         }
173
174         /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
175         if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
176                 *pos = status->noise;
177                 rthdr->it_present |=
178                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
179                 pos++;
180         }
181
182         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
183
184         /* IEEE80211_RADIOTAP_ANTENNA */
185         *pos = status->antenna;
186         pos++;
187
188         /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
189         if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
190                 *pos = status->signal;
191                 rthdr->it_present |=
192                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
193                 pos++;
194         }
195
196         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
197
198         /* IEEE80211_RADIOTAP_RX_FLAGS */
199         /* ensure 2 byte alignment for the 2 byte field as required */
200         if ((pos - (unsigned char *)rthdr) & 1)
201                 pos++;
202         /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
203         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
204                 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
205         pos += 2;
206 }
207
208 /*
209  * This function copies a received frame to all monitor interfaces and
210  * returns a cleaned-up SKB that no longer includes the FCS nor the
211  * radiotap header the driver might have added.
212  */
213 static struct sk_buff *
214 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
215                      struct ieee80211_rx_status *status,
216                      struct ieee80211_rate *rate)
217 {
218         struct ieee80211_sub_if_data *sdata;
219         int needed_headroom = 0;
220         struct sk_buff *skb, *skb2;
221         struct net_device *prev_dev = NULL;
222         int present_fcs_len = 0;
223         int rtap_len = 0;
224
225         /*
226          * First, we may need to make a copy of the skb because
227          *  (1) we need to modify it for radiotap (if not present), and
228          *  (2) the other RX handlers will modify the skb we got.
229          *
230          * We don't need to, of course, if we aren't going to return
231          * the SKB because it has a bad FCS/PLCP checksum.
232          */
233         if (status->flag & RX_FLAG_RADIOTAP)
234                 rtap_len = ieee80211_get_radiotap_len(origskb->data);
235         else
236                 /* room for the radiotap header based on driver features */
237                 needed_headroom = ieee80211_rx_radiotap_len(local, status);
238
239         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
240                 present_fcs_len = FCS_LEN;
241
242         if (!local->monitors) {
243                 if (should_drop_frame(status, origskb, present_fcs_len,
244                                       rtap_len)) {
245                         dev_kfree_skb(origskb);
246                         return NULL;
247                 }
248
249                 return remove_monitor_info(local, origskb, rtap_len);
250         }
251
252         if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
253                 /* only need to expand headroom if necessary */
254                 skb = origskb;
255                 origskb = NULL;
256
257                 /*
258                  * This shouldn't trigger often because most devices have an
259                  * RX header they pull before we get here, and that should
260                  * be big enough for our radiotap information. We should
261                  * probably export the length to drivers so that we can have
262                  * them allocate enough headroom to start with.
263                  */
264                 if (skb_headroom(skb) < needed_headroom &&
265                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
266                         dev_kfree_skb(skb);
267                         return NULL;
268                 }
269         } else {
270                 /*
271                  * Need to make a copy and possibly remove radiotap header
272                  * and FCS from the original.
273                  */
274                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
275
276                 origskb = remove_monitor_info(local, origskb, rtap_len);
277
278                 if (!skb)
279                         return origskb;
280         }
281
282         /* if necessary, prepend radiotap information */
283         if (!(status->flag & RX_FLAG_RADIOTAP))
284                 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
285                                                  needed_headroom);
286
287         skb_reset_mac_header(skb);
288         skb->ip_summed = CHECKSUM_UNNECESSARY;
289         skb->pkt_type = PACKET_OTHERHOST;
290         skb->protocol = htons(ETH_P_802_2);
291
292         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
293                 if (!netif_running(sdata->dev))
294                         continue;
295
296                 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
297                         continue;
298
299                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
300                         continue;
301
302                 if (prev_dev) {
303                         skb2 = skb_clone(skb, GFP_ATOMIC);
304                         if (skb2) {
305                                 skb2->dev = prev_dev;
306                                 netif_rx(skb2);
307                         }
308                 }
309
310                 prev_dev = sdata->dev;
311                 sdata->dev->stats.rx_packets++;
312                 sdata->dev->stats.rx_bytes += skb->len;
313         }
314
315         if (prev_dev) {
316                 skb->dev = prev_dev;
317                 netif_rx(skb);
318         } else
319                 dev_kfree_skb(skb);
320
321         return origskb;
322 }
323
324
325 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
326 {
327         u8 *data = rx->skb->data;
328         int tid;
329
330         /* does the frame have a qos control field? */
331         if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
332                 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
333                 /* frame has qos control */
334                 tid = qc[0] & QOS_CONTROL_TID_MASK;
335                 if (qc[0] & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
336                         rx->flags |= IEEE80211_RX_AMSDU;
337                 else
338                         rx->flags &= ~IEEE80211_RX_AMSDU;
339         } else {
340                 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
341                         /* Separate TID for management frames */
342                         tid = NUM_RX_DATA_QUEUES - 1;
343                 } else {
344                         /* no qos control present */
345                         tid = 0; /* 802.1d - Best Effort */
346                 }
347         }
348
349         rx->queue = tid;
350         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
351          * For now, set skb->priority to 0 for other cases. */
352         rx->skb->priority = (tid > 7) ? 0 : tid;
353 }
354
355 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
356 {
357 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
358         int hdrlen;
359
360         if (!WLAN_FC_DATA_PRESENT(rx->fc))
361                 return;
362
363         /*
364          * Drivers are required to align the payload data in a way that
365          * guarantees that the contained IP header is aligned to a four-
366          * byte boundary. In the case of regular frames, this simply means
367          * aligning the payload to a four-byte boundary (because either
368          * the IP header is directly contained, or IV/RFC1042 headers that
369          * have a length divisible by four are in front of it.
370          *
371          * With A-MSDU frames, however, the payload data address must
372          * yield two modulo four because there are 14-byte 802.3 headers
373          * within the A-MSDU frames that push the IP header further back
374          * to a multiple of four again. Thankfully, the specs were sane
375          * enough this time around to require padding each A-MSDU subframe
376          * to a length that is a multiple of four.
377          *
378          * Padding like atheros hardware adds which is inbetween the 802.11
379          * header and the payload is not supported, the driver is required
380          * to move the 802.11 header further back in that case.
381          */
382         hdrlen = ieee80211_get_hdrlen(rx->fc);
383         if (rx->flags & IEEE80211_RX_AMSDU)
384                 hdrlen += ETH_HLEN;
385         WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
386 #endif
387 }
388
389
390 /* rx handlers */
391
392 static ieee80211_rx_result
393 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
394 {
395         struct ieee80211_local *local = rx->local;
396         struct sk_buff *skb = rx->skb;
397
398         if (unlikely(local->sta_hw_scanning))
399                 return ieee80211_sta_rx_scan(rx->dev, skb, rx->status);
400
401         if (unlikely(local->sta_sw_scanning)) {
402                 /* drop all the other packets during a software scan anyway */
403                 if (ieee80211_sta_rx_scan(rx->dev, skb, rx->status)
404                     != RX_QUEUED)
405                         dev_kfree_skb(skb);
406                 return RX_QUEUED;
407         }
408
409         if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
410                 /* scanning finished during invoking of handlers */
411                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
412                 return RX_DROP_UNUSABLE;
413         }
414
415         return RX_CONTINUE;
416 }
417
418 static ieee80211_rx_result
419 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
420 {
421         int hdrlen = ieee80211_get_hdrlen(rx->fc);
422         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
423
424 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
425
426         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) {
427                 if (!((rx->fc & IEEE80211_FCTL_FROMDS) &&
428                       (rx->fc & IEEE80211_FCTL_TODS)))
429                         return RX_DROP_MONITOR;
430                 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
431                         return RX_DROP_MONITOR;
432         }
433
434         /* If there is not an established peer link and this is not a peer link
435          * establisment frame, beacon or probe, drop the frame.
436          */
437
438         if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
439                 struct ieee80211_mgmt *mgmt;
440
441                 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
442                         return RX_DROP_MONITOR;
443
444                 switch (rx->fc & IEEE80211_FCTL_STYPE) {
445                 case IEEE80211_STYPE_ACTION:
446                         mgmt = (struct ieee80211_mgmt *)hdr;
447                         if (mgmt->u.action.category != PLINK_CATEGORY)
448                                 return RX_DROP_MONITOR;
449                         /* fall through on else */
450                 case IEEE80211_STYPE_PROBE_REQ:
451                 case IEEE80211_STYPE_PROBE_RESP:
452                 case IEEE80211_STYPE_BEACON:
453                         return RX_CONTINUE;
454                         break;
455                 default:
456                         return RX_DROP_MONITOR;
457                 }
458
459          } else if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
460                     is_multicast_ether_addr(hdr->addr1) &&
461                     mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->dev))
462                 return RX_DROP_MONITOR;
463 #undef msh_h_get
464
465         return RX_CONTINUE;
466 }
467
468
469 static ieee80211_rx_result
470 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
471 {
472         struct ieee80211_hdr *hdr;
473
474         hdr = (struct ieee80211_hdr *) rx->skb->data;
475
476         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
477         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
478                 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
479                              rx->sta->last_seq_ctrl[rx->queue] ==
480                              hdr->seq_ctrl)) {
481                         if (rx->flags & IEEE80211_RX_RA_MATCH) {
482                                 rx->local->dot11FrameDuplicateCount++;
483                                 rx->sta->num_duplicates++;
484                         }
485                         return RX_DROP_MONITOR;
486                 } else
487                         rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
488         }
489
490         if (unlikely(rx->skb->len < 16)) {
491                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
492                 return RX_DROP_MONITOR;
493         }
494
495         /* Drop disallowed frame classes based on STA auth/assoc state;
496          * IEEE 802.11, Chap 5.5.
497          *
498          * 80211.o does filtering only based on association state, i.e., it
499          * drops Class 3 frames from not associated stations. hostapd sends
500          * deauth/disassoc frames when needed. In addition, hostapd is
501          * responsible for filtering on both auth and assoc states.
502          */
503
504         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
505                 return ieee80211_rx_mesh_check(rx);
506
507         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
508                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
509                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
510                      rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
511                      (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
512                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
513                      !(rx->fc & IEEE80211_FCTL_TODS) &&
514                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
515                     || !(rx->flags & IEEE80211_RX_RA_MATCH)) {
516                         /* Drop IBSS frames and frames for other hosts
517                          * silently. */
518                         return RX_DROP_MONITOR;
519                 }
520
521                 return RX_DROP_MONITOR;
522         }
523
524         return RX_CONTINUE;
525 }
526
527
528 static ieee80211_rx_result
529 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
530 {
531         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
532         int keyidx;
533         int hdrlen;
534         ieee80211_rx_result result = RX_DROP_UNUSABLE;
535         struct ieee80211_key *stakey = NULL;
536
537         /*
538          * Key selection 101
539          *
540          * There are three types of keys:
541          *  - GTK (group keys)
542          *  - PTK (pairwise keys)
543          *  - STK (station-to-station pairwise keys)
544          *
545          * When selecting a key, we have to distinguish between multicast
546          * (including broadcast) and unicast frames, the latter can only
547          * use PTKs and STKs while the former always use GTKs. Unless, of
548          * course, actual WEP keys ("pre-RSNA") are used, then unicast
549          * frames can also use key indizes like GTKs. Hence, if we don't
550          * have a PTK/STK we check the key index for a WEP key.
551          *
552          * Note that in a regular BSS, multicast frames are sent by the
553          * AP only, associated stations unicast the frame to the AP first
554          * which then multicasts it on their behalf.
555          *
556          * There is also a slight problem in IBSS mode: GTKs are negotiated
557          * with each station, that is something we don't currently handle.
558          * The spec seems to expect that one negotiates the same key with
559          * every station but there's no such requirement; VLANs could be
560          * possible.
561          */
562
563         if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
564                 return RX_CONTINUE;
565
566         /*
567          * No point in finding a key and decrypting if the frame is neither
568          * addressed to us nor a multicast frame.
569          */
570         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
571                 return RX_CONTINUE;
572
573         if (rx->sta)
574                 stakey = rcu_dereference(rx->sta->key);
575
576         if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
577                 rx->key = stakey;
578         } else {
579                 /*
580                  * The device doesn't give us the IV so we won't be
581                  * able to look up the key. That's ok though, we
582                  * don't need to decrypt the frame, we just won't
583                  * be able to keep statistics accurate.
584                  * Except for key threshold notifications, should
585                  * we somehow allow the driver to tell us which key
586                  * the hardware used if this flag is set?
587                  */
588                 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
589                     (rx->status->flag & RX_FLAG_IV_STRIPPED))
590                         return RX_CONTINUE;
591
592                 hdrlen = ieee80211_get_hdrlen(rx->fc);
593
594                 if (rx->skb->len < 8 + hdrlen)
595                         return RX_DROP_UNUSABLE; /* TODO: count this? */
596
597                 /*
598                  * no need to call ieee80211_wep_get_keyidx,
599                  * it verifies a bunch of things we've done already
600                  */
601                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
602
603                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
604
605                 /*
606                  * RSNA-protected unicast frames should always be sent with
607                  * pairwise or station-to-station keys, but for WEP we allow
608                  * using a key index as well.
609                  */
610                 if (rx->key && rx->key->conf.alg != ALG_WEP &&
611                     !is_multicast_ether_addr(hdr->addr1))
612                         rx->key = NULL;
613         }
614
615         if (rx->key) {
616                 rx->key->tx_rx_count++;
617                 /* TODO: add threshold stuff again */
618         } else {
619 #ifdef CONFIG_MAC80211_DEBUG
620                 if (net_ratelimit())
621                         printk(KERN_DEBUG "%s: RX protected frame,"
622                                " but have no key\n", rx->dev->name);
623 #endif /* CONFIG_MAC80211_DEBUG */
624                 return RX_DROP_MONITOR;
625         }
626
627         /* Check for weak IVs if possible */
628         if (rx->sta && rx->key->conf.alg == ALG_WEP &&
629             ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
630             (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
631              !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
632             ieee80211_wep_is_weak_iv(rx->skb, rx->key))
633                 rx->sta->wep_weak_iv_count++;
634
635         switch (rx->key->conf.alg) {
636         case ALG_WEP:
637                 result = ieee80211_crypto_wep_decrypt(rx);
638                 break;
639         case ALG_TKIP:
640                 result = ieee80211_crypto_tkip_decrypt(rx);
641                 break;
642         case ALG_CCMP:
643                 result = ieee80211_crypto_ccmp_decrypt(rx);
644                 break;
645         }
646
647         /* either the frame has been decrypted or will be dropped */
648         rx->status->flag |= RX_FLAG_DECRYPTED;
649
650         return result;
651 }
652
653 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
654 {
655         struct ieee80211_sub_if_data *sdata;
656         DECLARE_MAC_BUF(mac);
657
658         sdata = sta->sdata;
659
660         if (sdata->bss)
661                 atomic_inc(&sdata->bss->num_sta_ps);
662         set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
663 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
664         printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
665                dev->name, print_mac(mac, sta->addr), sta->aid);
666 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
667 }
668
669 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
670 {
671         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
672         struct sk_buff *skb;
673         int sent = 0;
674         struct ieee80211_sub_if_data *sdata;
675         struct ieee80211_tx_info *info;
676         DECLARE_MAC_BUF(mac);
677
678         sdata = sta->sdata;
679
680         if (sdata->bss)
681                 atomic_dec(&sdata->bss->num_sta_ps);
682
683         clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
684
685         if (!skb_queue_empty(&sta->ps_tx_buf))
686                 sta_info_clear_tim_bit(sta);
687
688 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
689         printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
690                dev->name, print_mac(mac, sta->addr), sta->aid);
691 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
692
693         /* Send all buffered frames to the station */
694         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
695                 info = IEEE80211_SKB_CB(skb);
696                 sent++;
697                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
698                 dev_queue_xmit(skb);
699         }
700         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
701                 info = IEEE80211_SKB_CB(skb);
702                 local->total_ps_buffered--;
703                 sent++;
704 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
705                 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
706                        "since STA not sleeping anymore\n", dev->name,
707                        print_mac(mac, sta->addr), sta->aid);
708 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
709                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
710                 dev_queue_xmit(skb);
711         }
712
713         return sent;
714 }
715
716 static ieee80211_rx_result
717 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
718 {
719         struct sta_info *sta = rx->sta;
720         struct net_device *dev = rx->dev;
721         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
722
723         if (!sta)
724                 return RX_CONTINUE;
725
726         /* Update last_rx only for IBSS packets which are for the current
727          * BSSID to avoid keeping the current IBSS network alive in cases where
728          * other STAs are using different BSSID. */
729         if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
730                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
731                                                 IEEE80211_IF_TYPE_IBSS);
732                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
733                         sta->last_rx = jiffies;
734         } else
735         if (!is_multicast_ether_addr(hdr->addr1) ||
736             rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
737                 /* Update last_rx only for unicast frames in order to prevent
738                  * the Probe Request frames (the only broadcast frames from a
739                  * STA in infrastructure mode) from keeping a connection alive.
740                  * Mesh beacons will update last_rx when if they are found to
741                  * match the current local configuration when processed.
742                  */
743                 sta->last_rx = jiffies;
744         }
745
746         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
747                 return RX_CONTINUE;
748
749         sta->rx_fragments++;
750         sta->rx_bytes += rx->skb->len;
751         sta->last_signal = rx->status->signal;
752         sta->last_qual = rx->status->qual;
753         sta->last_noise = rx->status->noise;
754
755         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
756                 /* Change STA power saving mode only in the end of a frame
757                  * exchange sequence */
758                 if (test_sta_flags(sta, WLAN_STA_PS) &&
759                     !(rx->fc & IEEE80211_FCTL_PM))
760                         rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
761                 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
762                          (rx->fc & IEEE80211_FCTL_PM))
763                         ap_sta_ps_start(dev, sta);
764         }
765
766         /* Drop data::nullfunc frames silently, since they are used only to
767          * control station power saving mode. */
768         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
769             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
770                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
771                 /* Update counter and free packet here to avoid counting this
772                  * as a dropped packed. */
773                 sta->rx_packets++;
774                 dev_kfree_skb(rx->skb);
775                 return RX_QUEUED;
776         }
777
778         return RX_CONTINUE;
779 } /* ieee80211_rx_h_sta_process */
780
781 static inline struct ieee80211_fragment_entry *
782 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
783                          unsigned int frag, unsigned int seq, int rx_queue,
784                          struct sk_buff **skb)
785 {
786         struct ieee80211_fragment_entry *entry;
787         int idx;
788
789         idx = sdata->fragment_next;
790         entry = &sdata->fragments[sdata->fragment_next++];
791         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
792                 sdata->fragment_next = 0;
793
794         if (!skb_queue_empty(&entry->skb_list)) {
795 #ifdef CONFIG_MAC80211_DEBUG
796                 struct ieee80211_hdr *hdr =
797                         (struct ieee80211_hdr *) entry->skb_list.next->data;
798                 DECLARE_MAC_BUF(mac);
799                 DECLARE_MAC_BUF(mac2);
800                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
801                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
802                        "addr1=%s addr2=%s\n",
803                        sdata->dev->name, idx,
804                        jiffies - entry->first_frag_time, entry->seq,
805                        entry->last_frag, print_mac(mac, hdr->addr1),
806                        print_mac(mac2, hdr->addr2));
807 #endif /* CONFIG_MAC80211_DEBUG */
808                 __skb_queue_purge(&entry->skb_list);
809         }
810
811         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
812         *skb = NULL;
813         entry->first_frag_time = jiffies;
814         entry->seq = seq;
815         entry->rx_queue = rx_queue;
816         entry->last_frag = frag;
817         entry->ccmp = 0;
818         entry->extra_len = 0;
819
820         return entry;
821 }
822
823 static inline struct ieee80211_fragment_entry *
824 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
825                           u16 fc, unsigned int frag, unsigned int seq,
826                           int rx_queue, struct ieee80211_hdr *hdr)
827 {
828         struct ieee80211_fragment_entry *entry;
829         int i, idx;
830
831         idx = sdata->fragment_next;
832         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
833                 struct ieee80211_hdr *f_hdr;
834                 u16 f_fc;
835
836                 idx--;
837                 if (idx < 0)
838                         idx = IEEE80211_FRAGMENT_MAX - 1;
839
840                 entry = &sdata->fragments[idx];
841                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
842                     entry->rx_queue != rx_queue ||
843                     entry->last_frag + 1 != frag)
844                         continue;
845
846                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
847                 f_fc = le16_to_cpu(f_hdr->frame_control);
848
849                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
850                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
851                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
852                         continue;
853
854                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
855                         __skb_queue_purge(&entry->skb_list);
856                         continue;
857                 }
858                 return entry;
859         }
860
861         return NULL;
862 }
863
864 static ieee80211_rx_result
865 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
866 {
867         struct ieee80211_hdr *hdr;
868         u16 sc;
869         unsigned int frag, seq;
870         struct ieee80211_fragment_entry *entry;
871         struct sk_buff *skb;
872         DECLARE_MAC_BUF(mac);
873
874         hdr = (struct ieee80211_hdr *) rx->skb->data;
875         sc = le16_to_cpu(hdr->seq_ctrl);
876         frag = sc & IEEE80211_SCTL_FRAG;
877
878         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
879                    (rx->skb)->len < 24 ||
880                    is_multicast_ether_addr(hdr->addr1))) {
881                 /* not fragmented */
882                 goto out;
883         }
884         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
885
886         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
887
888         if (frag == 0) {
889                 /* This is the first fragment of a new frame. */
890                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
891                                                  rx->queue, &(rx->skb));
892                 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
893                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
894                         /* Store CCMP PN so that we can verify that the next
895                          * fragment has a sequential PN value. */
896                         entry->ccmp = 1;
897                         memcpy(entry->last_pn,
898                                rx->key->u.ccmp.rx_pn[rx->queue],
899                                CCMP_PN_LEN);
900                 }
901                 return RX_QUEUED;
902         }
903
904         /* This is a fragment for a frame that should already be pending in
905          * fragment cache. Add this fragment to the end of the pending entry.
906          */
907         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
908                                           rx->queue, hdr);
909         if (!entry) {
910                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
911                 return RX_DROP_MONITOR;
912         }
913
914         /* Verify that MPDUs within one MSDU have sequential PN values.
915          * (IEEE 802.11i, 8.3.3.4.5) */
916         if (entry->ccmp) {
917                 int i;
918                 u8 pn[CCMP_PN_LEN], *rpn;
919                 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
920                         return RX_DROP_UNUSABLE;
921                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
922                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
923                         pn[i]++;
924                         if (pn[i])
925                                 break;
926                 }
927                 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
928                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
929                         if (net_ratelimit())
930                                 printk(KERN_DEBUG "%s: defrag: CCMP PN not "
931                                        "sequential A2=%s"
932                                        " PN=%02x%02x%02x%02x%02x%02x "
933                                        "(expected %02x%02x%02x%02x%02x%02x)\n",
934                                        rx->dev->name, print_mac(mac, hdr->addr2),
935                                        rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
936                                        rpn[5], pn[0], pn[1], pn[2], pn[3],
937                                        pn[4], pn[5]);
938                         return RX_DROP_UNUSABLE;
939                 }
940                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
941         }
942
943         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
944         __skb_queue_tail(&entry->skb_list, rx->skb);
945         entry->last_frag = frag;
946         entry->extra_len += rx->skb->len;
947         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
948                 rx->skb = NULL;
949                 return RX_QUEUED;
950         }
951
952         rx->skb = __skb_dequeue(&entry->skb_list);
953         if (skb_tailroom(rx->skb) < entry->extra_len) {
954                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
955                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
956                                               GFP_ATOMIC))) {
957                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
958                         __skb_queue_purge(&entry->skb_list);
959                         return RX_DROP_UNUSABLE;
960                 }
961         }
962         while ((skb = __skb_dequeue(&entry->skb_list))) {
963                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
964                 dev_kfree_skb(skb);
965         }
966
967         /* Complete frame has been reassembled - process it now */
968         rx->flags |= IEEE80211_RX_FRAGMENTED;
969
970  out:
971         if (rx->sta)
972                 rx->sta->rx_packets++;
973         if (is_multicast_ether_addr(hdr->addr1))
974                 rx->local->dot11MulticastReceivedFrameCount++;
975         else
976                 ieee80211_led_rx(rx->local);
977         return RX_CONTINUE;
978 }
979
980 static ieee80211_rx_result
981 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
982 {
983         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
984         struct sk_buff *skb;
985         int no_pending_pkts;
986         DECLARE_MAC_BUF(mac);
987
988         if (likely(!rx->sta ||
989                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
990                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
991                    !(rx->flags & IEEE80211_RX_RA_MATCH)))
992                 return RX_CONTINUE;
993
994         if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
995             (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
996                 return RX_DROP_UNUSABLE;
997
998         skb = skb_dequeue(&rx->sta->tx_filtered);
999         if (!skb) {
1000                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1001                 if (skb)
1002                         rx->local->total_ps_buffered--;
1003         }
1004         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1005                 skb_queue_empty(&rx->sta->ps_tx_buf);
1006
1007         if (skb) {
1008                 struct ieee80211_hdr *hdr =
1009                         (struct ieee80211_hdr *) skb->data;
1010
1011                 /*
1012                  * Tell TX path to send one frame even though the STA may
1013                  * still remain is PS mode after this frame exchange.
1014                  */
1015                 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1016
1017 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1018                 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1019                        print_mac(mac, rx->sta->addr), rx->sta->aid,
1020                        skb_queue_len(&rx->sta->ps_tx_buf));
1021 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1022
1023                 /* Use MoreData flag to indicate whether there are more
1024                  * buffered frames for this STA */
1025                 if (no_pending_pkts)
1026                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1027                 else
1028                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1029
1030                 dev_queue_xmit(skb);
1031
1032                 if (no_pending_pkts)
1033                         sta_info_clear_tim_bit(rx->sta);
1034 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1035         } else if (!rx->sent_ps_buffered) {
1036                 /*
1037                  * FIXME: This can be the result of a race condition between
1038                  *        us expiring a frame and the station polling for it.
1039                  *        Should we send it a null-func frame indicating we
1040                  *        have nothing buffered for it?
1041                  */
1042                 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1043                        "though there is no buffered frames for it\n",
1044                        rx->dev->name, print_mac(mac, rx->sta->addr));
1045 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1046         }
1047
1048         /* Free PS Poll skb here instead of returning RX_DROP that would
1049          * count as an dropped frame. */
1050         dev_kfree_skb(rx->skb);
1051
1052         return RX_QUEUED;
1053 }
1054
1055 static ieee80211_rx_result
1056 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1057 {
1058         u16 fc = rx->fc;
1059         u8 *data = rx->skb->data;
1060         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
1061
1062         if (!WLAN_FC_IS_QOS_DATA(fc))
1063                 return RX_CONTINUE;
1064
1065         /* remove the qos control field, update frame type and meta-data */
1066         memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
1067         hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
1068         /* change frame type to non QOS */
1069         rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
1070         hdr->frame_control = cpu_to_le16(fc);
1071
1072         return RX_CONTINUE;
1073 }
1074
1075 static int
1076 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1077 {
1078         if (unlikely(!rx->sta ||
1079             !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) {
1080 #ifdef CONFIG_MAC80211_DEBUG
1081                 if (net_ratelimit())
1082                         printk(KERN_DEBUG "%s: dropped frame "
1083                                "(unauthorized port)\n", rx->dev->name);
1084 #endif /* CONFIG_MAC80211_DEBUG */
1085                 return -EACCES;
1086         }
1087
1088         return 0;
1089 }
1090
1091 static int
1092 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx)
1093 {
1094         /*
1095          * Pass through unencrypted frames if the hardware has
1096          * decrypted them already.
1097          */
1098         if (rx->status->flag & RX_FLAG_DECRYPTED)
1099                 return 0;
1100
1101         /* Drop unencrypted frames if key is set. */
1102         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
1103                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
1104                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
1105                      (rx->key || rx->sdata->drop_unencrypted)))
1106                 return -EACCES;
1107
1108         return 0;
1109 }
1110
1111 static int
1112 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1113 {
1114         struct net_device *dev = rx->dev;
1115         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1116         u16 fc, hdrlen, ethertype;
1117         u8 *payload;
1118         u8 dst[ETH_ALEN];
1119         u8 src[ETH_ALEN] __aligned(2);
1120         struct sk_buff *skb = rx->skb;
1121         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1122         DECLARE_MAC_BUF(mac);
1123         DECLARE_MAC_BUF(mac2);
1124         DECLARE_MAC_BUF(mac3);
1125         DECLARE_MAC_BUF(mac4);
1126
1127         fc = rx->fc;
1128
1129         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1130                 return -1;
1131
1132         hdrlen = ieee80211_get_hdrlen(fc);
1133
1134         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1135                 int meshhdrlen = ieee80211_get_mesh_hdrlen(
1136                                 (struct ieee80211s_hdr *) (skb->data + hdrlen));
1137                 /* Copy on cb:
1138                  *  - mesh header: to be used for mesh forwarding
1139                  * decision. It will also be used as mesh header template at
1140                  * tx.c:ieee80211_subif_start_xmit() if interface
1141                  * type is mesh and skb->pkt_type == PACKET_OTHERHOST
1142                  *  - ta: to be used if a RERR needs to be sent.
1143                  */
1144                 memcpy(skb->cb, skb->data + hdrlen, meshhdrlen);
1145                 memcpy(MESH_PREQ(skb), hdr->addr2, ETH_ALEN);
1146                 hdrlen += meshhdrlen;
1147         }
1148
1149         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1150          * header
1151          * IEEE 802.11 address fields:
1152          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1153          *   0     0   DA    SA    BSSID n/a
1154          *   0     1   DA    BSSID SA    n/a
1155          *   1     0   BSSID SA    DA    n/a
1156          *   1     1   RA    TA    DA    SA
1157          */
1158
1159         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1160         case IEEE80211_FCTL_TODS:
1161                 /* BSSID SA DA */
1162                 memcpy(dst, hdr->addr3, ETH_ALEN);
1163                 memcpy(src, hdr->addr2, ETH_ALEN);
1164
1165                 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
1166                              sdata->vif.type != IEEE80211_IF_TYPE_VLAN)) {
1167                         if (net_ratelimit())
1168                                 printk(KERN_DEBUG "%s: dropped ToDS frame "
1169                                        "(BSSID=%s SA=%s DA=%s)\n",
1170                                        dev->name,
1171                                        print_mac(mac, hdr->addr1),
1172                                        print_mac(mac2, hdr->addr2),
1173                                        print_mac(mac3, hdr->addr3));
1174                         return -1;
1175                 }
1176                 break;
1177         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1178                 /* RA TA DA SA */
1179                 memcpy(dst, hdr->addr3, ETH_ALEN);
1180                 memcpy(src, hdr->addr4, ETH_ALEN);
1181
1182                  if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
1183                              sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT)) {
1184                          if (net_ratelimit())
1185                                  printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
1186                                        "frame (RA=%s TA=%s DA=%s SA=%s)\n",
1187                                        rx->dev->name,
1188                                        print_mac(mac, hdr->addr1),
1189                                        print_mac(mac2, hdr->addr2),
1190                                        print_mac(mac3, hdr->addr3),
1191                                        print_mac(mac4, hdr->addr4));
1192                         return -1;
1193                 }
1194                 break;
1195         case IEEE80211_FCTL_FROMDS:
1196                 /* DA BSSID SA */
1197                 memcpy(dst, hdr->addr1, ETH_ALEN);
1198                 memcpy(src, hdr->addr3, ETH_ALEN);
1199
1200                 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
1201                     (is_multicast_ether_addr(dst) &&
1202                      !compare_ether_addr(src, dev->dev_addr)))
1203                         return -1;
1204                 break;
1205         case 0:
1206                 /* DA SA BSSID */
1207                 memcpy(dst, hdr->addr1, ETH_ALEN);
1208                 memcpy(src, hdr->addr2, ETH_ALEN);
1209
1210                 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1211                         if (net_ratelimit()) {
1212                                 printk(KERN_DEBUG "%s: dropped IBSS frame "
1213                                        "(DA=%s SA=%s BSSID=%s)\n",
1214                                        dev->name,
1215                                        print_mac(mac, hdr->addr1),
1216                                        print_mac(mac2, hdr->addr2),
1217                                        print_mac(mac3, hdr->addr3));
1218                         }
1219                         return -1;
1220                 }
1221                 break;
1222         }
1223
1224         if (unlikely(skb->len - hdrlen < 8)) {
1225                 if (net_ratelimit()) {
1226                         printk(KERN_DEBUG "%s: RX too short data frame "
1227                                "payload\n", dev->name);
1228                 }
1229                 return -1;
1230         }
1231
1232         payload = skb->data + hdrlen;
1233         ethertype = (payload[6] << 8) | payload[7];
1234
1235         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1236                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1237                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1238                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1239                  * replace EtherType */
1240                 skb_pull(skb, hdrlen + 6);
1241                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1242                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1243         } else {
1244                 struct ethhdr *ehdr;
1245                 __be16 len;
1246
1247                 skb_pull(skb, hdrlen);
1248                 len = htons(skb->len);
1249                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1250                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1251                 memcpy(ehdr->h_source, src, ETH_ALEN);
1252                 ehdr->h_proto = len;
1253         }
1254         return 0;
1255 }
1256
1257 /*
1258  * requires that rx->skb is a frame with ethernet header
1259  */
1260 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx)
1261 {
1262         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1263                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1264         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1265
1266         /*
1267          * Allow EAPOL frames to us/the PAE group address regardless
1268          * of whether the frame was encrypted or not.
1269          */
1270         if (ehdr->h_proto == htons(ETH_P_PAE) &&
1271             (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1272              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1273                 return true;
1274
1275         if (ieee80211_802_1x_port_control(rx) ||
1276             ieee80211_drop_unencrypted(rx))
1277                 return false;
1278
1279         return true;
1280 }
1281
1282 /*
1283  * requires that rx->skb is a frame with ethernet header
1284  */
1285 static void
1286 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1287 {
1288         struct net_device *dev = rx->dev;
1289         struct ieee80211_local *local = rx->local;
1290         struct sk_buff *skb, *xmit_skb;
1291         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1292         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1293         struct sta_info *dsta;
1294
1295         skb = rx->skb;
1296         xmit_skb = NULL;
1297
1298         if (local->bridge_packets && (sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1299                                       sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
1300             (rx->flags & IEEE80211_RX_RA_MATCH)) {
1301                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1302                         /*
1303                          * send multicast frames both to higher layers in
1304                          * local net stack and back to the wireless medium
1305                          */
1306                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1307                         if (!xmit_skb && net_ratelimit())
1308                                 printk(KERN_DEBUG "%s: failed to clone "
1309                                        "multicast frame\n", dev->name);
1310                 } else {
1311                         dsta = sta_info_get(local, skb->data);
1312                         if (dsta && dsta->sdata->dev == dev) {
1313                                 /*
1314                                  * The destination station is associated to
1315                                  * this AP (in this VLAN), so send the frame
1316                                  * directly to it and do not pass it to local
1317                                  * net stack.
1318                                  */
1319                                 xmit_skb = skb;
1320                                 skb = NULL;
1321                         }
1322                 }
1323         }
1324
1325         /* Mesh forwarding */
1326         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1327                 u8 *mesh_ttl = &((struct ieee80211s_hdr *)skb->cb)->ttl;
1328                 (*mesh_ttl)--;
1329
1330                 if (is_multicast_ether_addr(skb->data)) {
1331                         if (*mesh_ttl > 0) {
1332                                 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1333                                 if (xmit_skb)
1334                                         xmit_skb->pkt_type = PACKET_OTHERHOST;
1335                                 else if (net_ratelimit())
1336                                         printk(KERN_DEBUG "%s: failed to clone "
1337                                                "multicast frame\n", dev->name);
1338                         } else
1339                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1340                                                              dropped_frames_ttl);
1341                 } else if (skb->pkt_type != PACKET_OTHERHOST &&
1342                         compare_ether_addr(dev->dev_addr, skb->data) != 0) {
1343                         if (*mesh_ttl == 0) {
1344                                 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.sta,
1345                                                              dropped_frames_ttl);
1346                                 dev_kfree_skb(skb);
1347                                 skb = NULL;
1348                         } else {
1349                                 xmit_skb = skb;
1350                                 xmit_skb->pkt_type = PACKET_OTHERHOST;
1351                                 if (!(dev->flags & IFF_PROMISC))
1352                                         skb  = NULL;
1353                         }
1354                 }
1355         }
1356
1357         if (skb) {
1358                 /* deliver to local stack */
1359                 skb->protocol = eth_type_trans(skb, dev);
1360                 memset(skb->cb, 0, sizeof(skb->cb));
1361                 netif_rx(skb);
1362         }
1363
1364         if (xmit_skb) {
1365                 /* send to wireless media */
1366                 xmit_skb->protocol = htons(ETH_P_802_3);
1367                 skb_reset_network_header(xmit_skb);
1368                 skb_reset_mac_header(xmit_skb);
1369                 dev_queue_xmit(xmit_skb);
1370         }
1371 }
1372
1373 static ieee80211_rx_result
1374 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1375 {
1376         struct net_device *dev = rx->dev;
1377         struct ieee80211_local *local = rx->local;
1378         u16 fc, ethertype;
1379         u8 *payload;
1380         struct sk_buff *skb = rx->skb, *frame = NULL;
1381         const struct ethhdr *eth;
1382         int remaining, err;
1383         u8 dst[ETH_ALEN];
1384         u8 src[ETH_ALEN];
1385         DECLARE_MAC_BUF(mac);
1386
1387         fc = rx->fc;
1388         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1389                 return RX_CONTINUE;
1390
1391         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1392                 return RX_DROP_MONITOR;
1393
1394         if (!(rx->flags & IEEE80211_RX_AMSDU))
1395                 return RX_CONTINUE;
1396
1397         err = ieee80211_data_to_8023(rx);
1398         if (unlikely(err))
1399                 return RX_DROP_UNUSABLE;
1400
1401         skb->dev = dev;
1402
1403         dev->stats.rx_packets++;
1404         dev->stats.rx_bytes += skb->len;
1405
1406         /* skip the wrapping header */
1407         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1408         if (!eth)
1409                 return RX_DROP_UNUSABLE;
1410
1411         while (skb != frame) {
1412                 u8 padding;
1413                 __be16 len = eth->h_proto;
1414                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1415
1416                 remaining = skb->len;
1417                 memcpy(dst, eth->h_dest, ETH_ALEN);
1418                 memcpy(src, eth->h_source, ETH_ALEN);
1419
1420                 padding = ((4 - subframe_len) & 0x3);
1421                 /* the last MSDU has no padding */
1422                 if (subframe_len > remaining) {
1423                         printk(KERN_DEBUG "%s: wrong buffer size\n", dev->name);
1424                         return RX_DROP_UNUSABLE;
1425                 }
1426
1427                 skb_pull(skb, sizeof(struct ethhdr));
1428                 /* if last subframe reuse skb */
1429                 if (remaining <= subframe_len + padding)
1430                         frame = skb;
1431                 else {
1432                         frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1433                                               subframe_len);
1434
1435                         if (frame == NULL)
1436                                 return RX_DROP_UNUSABLE;
1437
1438                         skb_reserve(frame, local->hw.extra_tx_headroom +
1439                                     sizeof(struct ethhdr));
1440                         memcpy(skb_put(frame, ntohs(len)), skb->data,
1441                                 ntohs(len));
1442
1443                         eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1444                                                         padding);
1445                         if (!eth) {
1446                                 printk(KERN_DEBUG "%s: wrong buffer size\n",
1447                                        dev->name);
1448                                 dev_kfree_skb(frame);
1449                                 return RX_DROP_UNUSABLE;
1450                         }
1451                 }
1452
1453                 skb_reset_network_header(frame);
1454                 frame->dev = dev;
1455                 frame->priority = skb->priority;
1456                 rx->skb = frame;
1457
1458                 payload = frame->data;
1459                 ethertype = (payload[6] << 8) | payload[7];
1460
1461                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1462                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1463                            compare_ether_addr(payload,
1464                                               bridge_tunnel_header) == 0)) {
1465                         /* remove RFC1042 or Bridge-Tunnel
1466                          * encapsulation and replace EtherType */
1467                         skb_pull(frame, 6);
1468                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1469                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1470                 } else {
1471                         memcpy(skb_push(frame, sizeof(__be16)),
1472                                &len, sizeof(__be16));
1473                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1474                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1475                 }
1476
1477                 if (!ieee80211_frame_allowed(rx)) {
1478                         if (skb == frame) /* last frame */
1479                                 return RX_DROP_UNUSABLE;
1480                         dev_kfree_skb(frame);
1481                         continue;
1482                 }
1483
1484                 ieee80211_deliver_skb(rx);
1485         }
1486
1487         return RX_QUEUED;
1488 }
1489
1490 static ieee80211_rx_result
1491 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1492 {
1493         struct net_device *dev = rx->dev;
1494         u16 fc;
1495         int err;
1496
1497         fc = rx->fc;
1498         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
1499                 return RX_CONTINUE;
1500
1501         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
1502                 return RX_DROP_MONITOR;
1503
1504         err = ieee80211_data_to_8023(rx);
1505         if (unlikely(err))
1506                 return RX_DROP_UNUSABLE;
1507
1508         if (!ieee80211_frame_allowed(rx))
1509                 return RX_DROP_MONITOR;
1510
1511         rx->skb->dev = dev;
1512
1513         dev->stats.rx_packets++;
1514         dev->stats.rx_bytes += rx->skb->len;
1515
1516         ieee80211_deliver_skb(rx);
1517
1518         return RX_QUEUED;
1519 }
1520
1521 static ieee80211_rx_result
1522 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1523 {
1524         struct ieee80211_local *local = rx->local;
1525         struct ieee80211_hw *hw = &local->hw;
1526         struct sk_buff *skb = rx->skb;
1527         struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
1528         struct tid_ampdu_rx *tid_agg_rx;
1529         u16 start_seq_num;
1530         u16 tid;
1531
1532         if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
1533                 return RX_CONTINUE;
1534
1535         if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
1536                 if (!rx->sta)
1537                         return RX_CONTINUE;
1538                 tid = le16_to_cpu(bar->control) >> 12;
1539                 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1540                                         != HT_AGG_STATE_OPERATIONAL)
1541                         return RX_CONTINUE;
1542                 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1543
1544                 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1545
1546                 /* reset session timer */
1547                 if (tid_agg_rx->timeout) {
1548                         unsigned long expires =
1549                                 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1550                         mod_timer(&tid_agg_rx->session_timer, expires);
1551                 }
1552
1553                 /* manage reordering buffer according to requested */
1554                 /* sequence number */
1555                 rcu_read_lock();
1556                 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1557                                                  start_seq_num, 1);
1558                 rcu_read_unlock();
1559                 return RX_DROP_UNUSABLE;
1560         }
1561
1562         return RX_CONTINUE;
1563 }
1564
1565 static ieee80211_rx_result
1566 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1567 {
1568         struct ieee80211_sub_if_data *sdata;
1569
1570         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1571                 return RX_DROP_MONITOR;
1572
1573         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1574         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1575              sdata->vif.type == IEEE80211_IF_TYPE_IBSS ||
1576              sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) &&
1577             !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
1578                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->status);
1579         else
1580                 return RX_DROP_MONITOR;
1581
1582         return RX_QUEUED;
1583 }
1584
1585 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1586                                             struct ieee80211_hdr *hdr,
1587                                             struct ieee80211_rx_data *rx)
1588 {
1589         int keyidx, hdrlen;
1590         DECLARE_MAC_BUF(mac);
1591         DECLARE_MAC_BUF(mac2);
1592
1593         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
1594         if (rx->skb->len >= hdrlen + 4)
1595                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1596         else
1597                 keyidx = -1;
1598
1599         if (net_ratelimit())
1600                 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
1601                        "failure from %s to %s keyidx=%d\n",
1602                        dev->name, print_mac(mac, hdr->addr2),
1603                        print_mac(mac2, hdr->addr1), keyidx);
1604
1605         if (!rx->sta) {
1606                 /*
1607                  * Some hardware seem to generate incorrect Michael MIC
1608                  * reports; ignore them to avoid triggering countermeasures.
1609                  */
1610                 if (net_ratelimit())
1611                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1612                                "error for unknown address %s\n",
1613                                dev->name, print_mac(mac, hdr->addr2));
1614                 goto ignore;
1615         }
1616
1617         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
1618                 if (net_ratelimit())
1619                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1620                                "error for a frame with no PROTECTED flag (src "
1621                                "%s)\n", dev->name, print_mac(mac, hdr->addr2));
1622                 goto ignore;
1623         }
1624
1625         if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
1626                 /*
1627                  * APs with pairwise keys should never receive Michael MIC
1628                  * errors for non-zero keyidx because these are reserved for
1629                  * group keys and only the AP is sending real multicast
1630                  * frames in the BSS.
1631                  */
1632                 if (net_ratelimit())
1633                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
1634                                "a frame with non-zero keyidx (%d)"
1635                                " (src %s)\n", dev->name, keyidx,
1636                                print_mac(mac, hdr->addr2));
1637                 goto ignore;
1638         }
1639
1640         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
1641             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
1642              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
1643                 if (net_ratelimit())
1644                         printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
1645                                "error for a frame that cannot be encrypted "
1646                                "(fc=0x%04x) (src %s)\n",
1647                                dev->name, rx->fc, print_mac(mac, hdr->addr2));
1648                 goto ignore;
1649         }
1650
1651         mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
1652  ignore:
1653         dev_kfree_skb(rx->skb);
1654         rx->skb = NULL;
1655 }
1656
1657 /* TODO: use IEEE80211_RX_FRAGMENTED */
1658 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1659 {
1660         struct ieee80211_sub_if_data *sdata;
1661         struct ieee80211_local *local = rx->local;
1662         struct ieee80211_rtap_hdr {
1663                 struct ieee80211_radiotap_header hdr;
1664                 u8 flags;
1665                 u8 rate;
1666                 __le16 chan_freq;
1667                 __le16 chan_flags;
1668         } __attribute__ ((packed)) *rthdr;
1669         struct sk_buff *skb = rx->skb, *skb2;
1670         struct net_device *prev_dev = NULL;
1671         struct ieee80211_rx_status *status = rx->status;
1672
1673         if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1674                 goto out_free_skb;
1675
1676         if (skb_headroom(skb) < sizeof(*rthdr) &&
1677             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1678                 goto out_free_skb;
1679
1680         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1681         memset(rthdr, 0, sizeof(*rthdr));
1682         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1683         rthdr->hdr.it_present =
1684                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1685                             (1 << IEEE80211_RADIOTAP_RATE) |
1686                             (1 << IEEE80211_RADIOTAP_CHANNEL));
1687
1688         rthdr->rate = rx->rate->bitrate / 5;
1689         rthdr->chan_freq = cpu_to_le16(status->freq);
1690
1691         if (status->band == IEEE80211_BAND_5GHZ)
1692                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1693                                                 IEEE80211_CHAN_5GHZ);
1694         else
1695                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1696                                                 IEEE80211_CHAN_2GHZ);
1697
1698         skb_set_mac_header(skb, 0);
1699         skb->ip_summed = CHECKSUM_UNNECESSARY;
1700         skb->pkt_type = PACKET_OTHERHOST;
1701         skb->protocol = htons(ETH_P_802_2);
1702
1703         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1704                 if (!netif_running(sdata->dev))
1705                         continue;
1706
1707                 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1708                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1709                         continue;
1710
1711                 if (prev_dev) {
1712                         skb2 = skb_clone(skb, GFP_ATOMIC);
1713                         if (skb2) {
1714                                 skb2->dev = prev_dev;
1715                                 netif_rx(skb2);
1716                         }
1717                 }
1718
1719                 prev_dev = sdata->dev;
1720                 sdata->dev->stats.rx_packets++;
1721                 sdata->dev->stats.rx_bytes += skb->len;
1722         }
1723
1724         if (prev_dev) {
1725                 skb->dev = prev_dev;
1726                 netif_rx(skb);
1727                 skb = NULL;
1728         } else
1729                 goto out_free_skb;
1730
1731         rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1732         return;
1733
1734  out_free_skb:
1735         dev_kfree_skb(skb);
1736 }
1737
1738 typedef ieee80211_rx_result (*ieee80211_rx_handler)(struct ieee80211_rx_data *);
1739 static ieee80211_rx_handler ieee80211_rx_handlers[] =
1740 {
1741         ieee80211_rx_h_passive_scan,
1742         ieee80211_rx_h_check,
1743         ieee80211_rx_h_decrypt,
1744         ieee80211_rx_h_sta_process,
1745         ieee80211_rx_h_defragment,
1746         ieee80211_rx_h_ps_poll,
1747         ieee80211_rx_h_michael_mic_verify,
1748         /* this must be after decryption - so header is counted in MPDU mic
1749          * must be before pae and data, so QOS_DATA format frames
1750          * are not passed to user space by these functions
1751          */
1752         ieee80211_rx_h_remove_qos_control,
1753         ieee80211_rx_h_amsdu,
1754         ieee80211_rx_h_data,
1755         ieee80211_rx_h_ctrl,
1756         ieee80211_rx_h_mgmt,
1757         NULL
1758 };
1759
1760 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1761                                          struct ieee80211_rx_data *rx,
1762                                          struct sk_buff *skb)
1763 {
1764         ieee80211_rx_handler *handler;
1765         ieee80211_rx_result res = RX_DROP_MONITOR;
1766
1767         rx->skb = skb;
1768         rx->sdata = sdata;
1769         rx->dev = sdata->dev;
1770
1771         for (handler = ieee80211_rx_handlers; *handler != NULL; handler++) {
1772                 res = (*handler)(rx);
1773
1774                 switch (res) {
1775                 case RX_CONTINUE:
1776                         continue;
1777                 case RX_DROP_UNUSABLE:
1778                 case RX_DROP_MONITOR:
1779                         I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1780                         if (rx->sta)
1781                                 rx->sta->rx_dropped++;
1782                         break;
1783                 case RX_QUEUED:
1784                         I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1785                         break;
1786                 }
1787                 break;
1788         }
1789
1790         switch (res) {
1791         case RX_CONTINUE:
1792         case RX_DROP_MONITOR:
1793                 ieee80211_rx_cooked_monitor(rx);
1794                 break;
1795         case RX_DROP_UNUSABLE:
1796                 dev_kfree_skb(rx->skb);
1797                 break;
1798         }
1799 }
1800
1801 /* main receive path */
1802
1803 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1804                                 u8 *bssid, struct ieee80211_rx_data *rx,
1805                                 struct ieee80211_hdr *hdr)
1806 {
1807         int multicast = is_multicast_ether_addr(hdr->addr1);
1808
1809         switch (sdata->vif.type) {
1810         case IEEE80211_IF_TYPE_STA:
1811                 if (!bssid)
1812                         return 0;
1813                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1814                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1815                                 return 0;
1816                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1817                 } else if (!multicast &&
1818                            compare_ether_addr(sdata->dev->dev_addr,
1819                                               hdr->addr1) != 0) {
1820                         if (!(sdata->dev->flags & IFF_PROMISC))
1821                                 return 0;
1822                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1823                 }
1824                 break;
1825         case IEEE80211_IF_TYPE_IBSS:
1826                 if (!bssid)
1827                         return 0;
1828                 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1829                     (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON)
1830                         return 1;
1831                 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1832                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1833                                 return 0;
1834                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1835                 } else if (!multicast &&
1836                            compare_ether_addr(sdata->dev->dev_addr,
1837                                               hdr->addr1) != 0) {
1838                         if (!(sdata->dev->flags & IFF_PROMISC))
1839                                 return 0;
1840                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1841                 } else if (!rx->sta)
1842                         rx->sta = ieee80211_ibss_add_sta(sdata->dev, rx->skb,
1843                                                          bssid, hdr->addr2);
1844                 break;
1845         case IEEE80211_IF_TYPE_MESH_POINT:
1846                 if (!multicast &&
1847                     compare_ether_addr(sdata->dev->dev_addr,
1848                                        hdr->addr1) != 0) {
1849                         if (!(sdata->dev->flags & IFF_PROMISC))
1850                                 return 0;
1851
1852                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1853                 }
1854                 break;
1855         case IEEE80211_IF_TYPE_VLAN:
1856         case IEEE80211_IF_TYPE_AP:
1857                 if (!bssid) {
1858                         if (compare_ether_addr(sdata->dev->dev_addr,
1859                                                hdr->addr1))
1860                                 return 0;
1861                 } else if (!ieee80211_bssid_match(bssid,
1862                                         sdata->dev->dev_addr)) {
1863                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1864                                 return 0;
1865                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1866                 }
1867                 if (sdata->dev == sdata->local->mdev &&
1868                     !(rx->flags & IEEE80211_RX_IN_SCAN))
1869                         /* do not receive anything via
1870                          * master device when not scanning */
1871                         return 0;
1872                 break;
1873         case IEEE80211_IF_TYPE_WDS:
1874                 if (bssid ||
1875                     (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
1876                         return 0;
1877                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1878                         return 0;
1879                 break;
1880         case IEEE80211_IF_TYPE_MNTR:
1881                 /* take everything */
1882                 break;
1883         case IEEE80211_IF_TYPE_INVALID:
1884                 /* should never get here */
1885                 WARN_ON(1);
1886                 break;
1887         }
1888
1889         return 1;
1890 }
1891
1892 /*
1893  * This is the actual Rx frames handler. as it blongs to Rx path it must
1894  * be called with rcu_read_lock protection.
1895  */
1896 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1897                                          struct sk_buff *skb,
1898                                          struct ieee80211_rx_status *status,
1899                                          struct ieee80211_rate *rate)
1900 {
1901         struct ieee80211_local *local = hw_to_local(hw);
1902         struct ieee80211_sub_if_data *sdata;
1903         struct ieee80211_hdr *hdr;
1904         struct ieee80211_rx_data rx;
1905         u16 type;
1906         int prepares;
1907         struct ieee80211_sub_if_data *prev = NULL;
1908         struct sk_buff *skb_new;
1909         u8 *bssid;
1910
1911         hdr = (struct ieee80211_hdr *) skb->data;
1912         memset(&rx, 0, sizeof(rx));
1913         rx.skb = skb;
1914         rx.local = local;
1915
1916         rx.status = status;
1917         rx.rate = rate;
1918         rx.fc = le16_to_cpu(hdr->frame_control);
1919         type = rx.fc & IEEE80211_FCTL_FTYPE;
1920
1921         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
1922                 local->dot11ReceivedFragmentCount++;
1923
1924         rx.sta = sta_info_get(local, hdr->addr2);
1925         if (rx.sta) {
1926                 rx.sdata = rx.sta->sdata;
1927                 rx.dev = rx.sta->sdata->dev;
1928         }
1929
1930         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1931                 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1932                 return;
1933         }
1934
1935         if (unlikely(local->sta_sw_scanning || local->sta_hw_scanning))
1936                 rx.flags |= IEEE80211_RX_IN_SCAN;
1937
1938         ieee80211_parse_qos(&rx);
1939         ieee80211_verify_ip_alignment(&rx);
1940
1941         skb = rx.skb;
1942
1943         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1944                 if (!netif_running(sdata->dev))
1945                         continue;
1946
1947                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
1948                         continue;
1949
1950                 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1951                 rx.flags |= IEEE80211_RX_RA_MATCH;
1952                 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1953
1954                 if (!prepares)
1955                         continue;
1956
1957                 /*
1958                  * frame is destined for this interface, but if it's not
1959                  * also for the previous one we handle that after the
1960                  * loop to avoid copying the SKB once too much
1961                  */
1962
1963                 if (!prev) {
1964                         prev = sdata;
1965                         continue;
1966                 }
1967
1968                 /*
1969                  * frame was destined for the previous interface
1970                  * so invoke RX handlers for it
1971                  */
1972
1973                 skb_new = skb_copy(skb, GFP_ATOMIC);
1974                 if (!skb_new) {
1975                         if (net_ratelimit())
1976                                 printk(KERN_DEBUG "%s: failed to copy "
1977                                        "multicast frame for %s\n",
1978                                        wiphy_name(local->hw.wiphy),
1979                                        prev->dev->name);
1980                         continue;
1981                 }
1982                 rx.fc = le16_to_cpu(hdr->frame_control);
1983                 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1984                 prev = sdata;
1985         }
1986         if (prev) {
1987                 rx.fc = le16_to_cpu(hdr->frame_control);
1988                 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1989         } else
1990                 dev_kfree_skb(skb);
1991 }
1992
1993 #define SEQ_MODULO 0x1000
1994 #define SEQ_MASK   0xfff
1995
1996 static inline int seq_less(u16 sq1, u16 sq2)
1997 {
1998         return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1999 }
2000
2001 static inline u16 seq_inc(u16 sq)
2002 {
2003         return ((sq + 1) & SEQ_MASK);
2004 }
2005
2006 static inline u16 seq_sub(u16 sq1, u16 sq2)
2007 {
2008         return ((sq1 - sq2) & SEQ_MASK);
2009 }
2010
2011
2012 /*
2013  * As it function blongs to Rx path it must be called with
2014  * the proper rcu_read_lock protection for its flow.
2015  */
2016 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2017                                 struct tid_ampdu_rx *tid_agg_rx,
2018                                 struct sk_buff *skb, u16 mpdu_seq_num,
2019                                 int bar_req)
2020 {
2021         struct ieee80211_local *local = hw_to_local(hw);
2022         struct ieee80211_rx_status status;
2023         u16 head_seq_num, buf_size;
2024         int index;
2025         struct ieee80211_supported_band *sband;
2026         struct ieee80211_rate *rate;
2027
2028         buf_size = tid_agg_rx->buf_size;
2029         head_seq_num = tid_agg_rx->head_seq_num;
2030
2031         /* frame with out of date sequence number */
2032         if (seq_less(mpdu_seq_num, head_seq_num)) {
2033                 dev_kfree_skb(skb);
2034                 return 1;
2035         }
2036
2037         /* if frame sequence number exceeds our buffering window size or
2038          * block Ack Request arrived - release stored frames */
2039         if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2040                 /* new head to the ordering buffer */
2041                 if (bar_req)
2042                         head_seq_num = mpdu_seq_num;
2043                 else
2044                         head_seq_num =
2045                                 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2046                 /* release stored frames up to new head to stack */
2047                 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2048                         index = seq_sub(tid_agg_rx->head_seq_num,
2049                                 tid_agg_rx->ssn)
2050                                 % tid_agg_rx->buf_size;
2051
2052                         if (tid_agg_rx->reorder_buf[index]) {
2053                                 /* release the reordered frames to stack */
2054                                 memcpy(&status,
2055                                         tid_agg_rx->reorder_buf[index]->cb,
2056                                         sizeof(status));
2057                                 sband = local->hw.wiphy->bands[status.band];
2058                                 rate = &sband->bitrates[status.rate_idx];
2059                                 __ieee80211_rx_handle_packet(hw,
2060                                         tid_agg_rx->reorder_buf[index],
2061                                         &status, rate);
2062                                 tid_agg_rx->stored_mpdu_num--;
2063                                 tid_agg_rx->reorder_buf[index] = NULL;
2064                         }
2065                         tid_agg_rx->head_seq_num =
2066                                 seq_inc(tid_agg_rx->head_seq_num);
2067                 }
2068                 if (bar_req)
2069                         return 1;
2070         }
2071
2072         /* now the new frame is always in the range of the reordering */
2073         /* buffer window */
2074         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2075                                 % tid_agg_rx->buf_size;
2076         /* check if we already stored this frame */
2077         if (tid_agg_rx->reorder_buf[index]) {
2078                 dev_kfree_skb(skb);
2079                 return 1;
2080         }
2081
2082         /* if arrived mpdu is in the right order and nothing else stored */
2083         /* release it immediately */
2084         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2085                         tid_agg_rx->stored_mpdu_num == 0) {
2086                 tid_agg_rx->head_seq_num =
2087                         seq_inc(tid_agg_rx->head_seq_num);
2088                 return 0;
2089         }
2090
2091         /* put the frame in the reordering buffer */
2092         tid_agg_rx->reorder_buf[index] = skb;
2093         tid_agg_rx->stored_mpdu_num++;
2094         /* release the buffer until next missing frame */
2095         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2096                                                 % tid_agg_rx->buf_size;
2097         while (tid_agg_rx->reorder_buf[index]) {
2098                 /* release the reordered frame back to stack */
2099                 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2100                         sizeof(status));
2101                 sband = local->hw.wiphy->bands[status.band];
2102                 rate = &sband->bitrates[status.rate_idx];
2103                 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2104                                              &status, rate);
2105                 tid_agg_rx->stored_mpdu_num--;
2106                 tid_agg_rx->reorder_buf[index] = NULL;
2107                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2108                 index = seq_sub(tid_agg_rx->head_seq_num,
2109                         tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2110         }
2111         return 1;
2112 }
2113
2114 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2115                                      struct sk_buff *skb)
2116 {
2117         struct ieee80211_hw *hw = &local->hw;
2118         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2119         struct sta_info *sta;
2120         struct tid_ampdu_rx *tid_agg_rx;
2121         u16 fc, sc;
2122         u16 mpdu_seq_num;
2123         u8 ret = 0, *qc;
2124         int tid;
2125
2126         sta = sta_info_get(local, hdr->addr2);
2127         if (!sta)
2128                 return ret;
2129
2130         fc = le16_to_cpu(hdr->frame_control);
2131
2132         /* filter the QoS data rx stream according to
2133          * STA/TID and check if this STA/TID is on aggregation */
2134         if (!WLAN_FC_IS_QOS_DATA(fc))
2135                 goto end_reorder;
2136
2137         qc = skb->data + ieee80211_get_hdrlen(fc) - QOS_CONTROL_LEN;
2138         tid = qc[0] & QOS_CONTROL_TID_MASK;
2139
2140         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2141                 goto end_reorder;
2142
2143         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2144
2145         /* null data frames are excluded */
2146         if (unlikely(fc & IEEE80211_STYPE_NULLFUNC))
2147                 goto end_reorder;
2148
2149         /* new un-ordered ampdu frame - process it */
2150
2151         /* reset session timer */
2152         if (tid_agg_rx->timeout) {
2153                 unsigned long expires =
2154                         jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2155                 mod_timer(&tid_agg_rx->session_timer, expires);
2156         }
2157
2158         /* if this mpdu is fragmented - terminate rx aggregation session */
2159         sc = le16_to_cpu(hdr->seq_ctrl);
2160         if (sc & IEEE80211_SCTL_FRAG) {
2161                 ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
2162                         tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2163                 ret = 1;
2164                 goto end_reorder;
2165         }
2166
2167         /* according to mpdu sequence number deal with reordering buffer */
2168         mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2169         ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2170                                                 mpdu_seq_num, 0);
2171  end_reorder:
2172         return ret;
2173 }
2174
2175 /*
2176  * This is the receive path handler. It is called by a low level driver when an
2177  * 802.11 MPDU is received from the hardware.
2178  */
2179 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2180                     struct ieee80211_rx_status *status)
2181 {
2182         struct ieee80211_local *local = hw_to_local(hw);
2183         struct ieee80211_rate *rate = NULL;
2184         struct ieee80211_supported_band *sband;
2185
2186         if (status->band < 0 ||
2187             status->band >= IEEE80211_NUM_BANDS) {
2188                 WARN_ON(1);
2189                 return;
2190         }
2191
2192         sband = local->hw.wiphy->bands[status->band];
2193
2194         if (!sband ||
2195             status->rate_idx < 0 ||
2196             status->rate_idx >= sband->n_bitrates) {
2197                 WARN_ON(1);
2198                 return;
2199         }
2200
2201         rate = &sband->bitrates[status->rate_idx];
2202
2203         /*
2204          * key references and virtual interfaces are protected using RCU
2205          * and this requires that we are in a read-side RCU section during
2206          * receive processing
2207          */
2208         rcu_read_lock();
2209
2210         /*
2211          * Frames with failed FCS/PLCP checksum are not returned,
2212          * all other frames are returned without radiotap header
2213          * if it was previously present.
2214          * Also, frames with less than 16 bytes are dropped.
2215          */
2216         skb = ieee80211_rx_monitor(local, skb, status, rate);
2217         if (!skb) {
2218                 rcu_read_unlock();
2219                 return;
2220         }
2221
2222         if (!ieee80211_rx_reorder_ampdu(local, skb))
2223                 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2224
2225         rcu_read_unlock();
2226 }
2227 EXPORT_SYMBOL(__ieee80211_rx);
2228
2229 /* This is a version of the rx handler that can be called from hard irq
2230  * context. Post the skb on the queue and schedule the tasklet */
2231 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2232                           struct ieee80211_rx_status *status)
2233 {
2234         struct ieee80211_local *local = hw_to_local(hw);
2235
2236         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2237
2238         skb->dev = local->mdev;
2239         /* copy status into skb->cb for use by tasklet */
2240         memcpy(skb->cb, status, sizeof(*status));
2241         skb->pkt_type = IEEE80211_RX_MSG;
2242         skb_queue_tail(&local->skb_queue, skb);
2243         tasklet_schedule(&local->tasklet);
2244 }
2245 EXPORT_SYMBOL(ieee80211_rx_irqsafe);