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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 (ieee80211_is_ctl(hdr->frame_control) &&
71             !ieee80211_is_pspoll(hdr->frame_control) &&
72             !ieee80211_is_back_req(hdr->frame_control))
73                 return 1;
74         return 0;
75 }
76
77 static int
78 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
79                           struct ieee80211_rx_status *status)
80 {
81         int len;
82
83         /* always present fields */
84         len = sizeof(struct ieee80211_radiotap_header) + 9;
85
86         if (status->flag & RX_FLAG_TSFT)
87                 len += 8;
88         if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
89             local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
90                 len += 1;
91         if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
92                 len += 1;
93
94         if (len & 1) /* padding for RX_FLAGS if necessary */
95                 len++;
96
97         /* make sure radiotap starts at a naturally aligned address */
98         if (len % 8)
99                 len = roundup(len, 8);
100
101         return len;
102 }
103
104 /**
105  * ieee80211_add_rx_radiotap_header - add radiotap header
106  *
107  * add a radiotap header containing all the fields which the hardware provided.
108  */
109 static void
110 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
111                                  struct sk_buff *skb,
112                                  struct ieee80211_rx_status *status,
113                                  struct ieee80211_rate *rate,
114                                  int rtap_len)
115 {
116         struct ieee80211_radiotap_header *rthdr;
117         unsigned char *pos;
118
119         rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120         memset(rthdr, 0, rtap_len);
121
122         /* radiotap header, set always present flags */
123         rthdr->it_present =
124                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125                             (1 << IEEE80211_RADIOTAP_RATE) |
126                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
127                             (1 << IEEE80211_RADIOTAP_ANTENNA) |
128                             (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129         rthdr->it_len = cpu_to_le16(rtap_len);
130
131         pos = (unsigned char *)(rthdr+1);
132
133         /* the order of the following fields is important */
134
135         /* IEEE80211_RADIOTAP_TSFT */
136         if (status->flag & RX_FLAG_TSFT) {
137                 *(__le64 *)pos = cpu_to_le64(status->mactime);
138                 rthdr->it_present |=
139                         cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140                 pos += 8;
141         }
142
143         /* IEEE80211_RADIOTAP_FLAGS */
144         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145                 *pos |= IEEE80211_RADIOTAP_F_FCS;
146         if (status->flag & RX_FLAG_SHORTPRE)
147                 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
148         pos++;
149
150         /* IEEE80211_RADIOTAP_RATE */
151         *pos = rate->bitrate / 5;
152         pos++;
153
154         /* IEEE80211_RADIOTAP_CHANNEL */
155         *(__le16 *)pos = cpu_to_le16(status->freq);
156         pos += 2;
157         if (status->band == IEEE80211_BAND_5GHZ)
158                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
159                                              IEEE80211_CHAN_5GHZ);
160         else if (rate->flags & IEEE80211_RATE_ERP_G)
161                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
162                                              IEEE80211_CHAN_2GHZ);
163         else
164                 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
165                                              IEEE80211_CHAN_2GHZ);
166         pos += 2;
167
168         /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
169         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
170                 *pos = status->signal;
171                 rthdr->it_present |=
172                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
173                 pos++;
174         }
175
176         /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
177         if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
178                 *pos = status->noise;
179                 rthdr->it_present |=
180                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
181                 pos++;
182         }
183
184         /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
185
186         /* IEEE80211_RADIOTAP_ANTENNA */
187         *pos = status->antenna;
188         pos++;
189
190         /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
191         if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
192                 *pos = status->signal;
193                 rthdr->it_present |=
194                         cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
195                 pos++;
196         }
197
198         /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
199
200         /* IEEE80211_RADIOTAP_RX_FLAGS */
201         /* ensure 2 byte alignment for the 2 byte field as required */
202         if ((pos - (unsigned char *)rthdr) & 1)
203                 pos++;
204         /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
205         if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
206                 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
207         pos += 2;
208 }
209
210 /*
211  * This function copies a received frame to all monitor interfaces and
212  * returns a cleaned-up SKB that no longer includes the FCS nor the
213  * radiotap header the driver might have added.
214  */
215 static struct sk_buff *
216 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
217                      struct ieee80211_rx_status *status,
218                      struct ieee80211_rate *rate)
219 {
220         struct ieee80211_sub_if_data *sdata;
221         int needed_headroom = 0;
222         struct sk_buff *skb, *skb2;
223         struct net_device *prev_dev = NULL;
224         int present_fcs_len = 0;
225         int rtap_len = 0;
226
227         /*
228          * First, we may need to make a copy of the skb because
229          *  (1) we need to modify it for radiotap (if not present), and
230          *  (2) the other RX handlers will modify the skb we got.
231          *
232          * We don't need to, of course, if we aren't going to return
233          * the SKB because it has a bad FCS/PLCP checksum.
234          */
235         if (status->flag & RX_FLAG_RADIOTAP)
236                 rtap_len = ieee80211_get_radiotap_len(origskb->data);
237         else
238                 /* room for the radiotap header based on driver features */
239                 needed_headroom = ieee80211_rx_radiotap_len(local, status);
240
241         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242                 present_fcs_len = FCS_LEN;
243
244         if (!local->monitors) {
245                 if (should_drop_frame(status, origskb, present_fcs_len,
246                                       rtap_len)) {
247                         dev_kfree_skb(origskb);
248                         return NULL;
249                 }
250
251                 return remove_monitor_info(local, origskb, rtap_len);
252         }
253
254         if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
255                 /* only need to expand headroom if necessary */
256                 skb = origskb;
257                 origskb = NULL;
258
259                 /*
260                  * This shouldn't trigger often because most devices have an
261                  * RX header they pull before we get here, and that should
262                  * be big enough for our radiotap information. We should
263                  * probably export the length to drivers so that we can have
264                  * them allocate enough headroom to start with.
265                  */
266                 if (skb_headroom(skb) < needed_headroom &&
267                     pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
268                         dev_kfree_skb(skb);
269                         return NULL;
270                 }
271         } else {
272                 /*
273                  * Need to make a copy and possibly remove radiotap header
274                  * and FCS from the original.
275                  */
276                 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
277
278                 origskb = remove_monitor_info(local, origskb, rtap_len);
279
280                 if (!skb)
281                         return origskb;
282         }
283
284         /* if necessary, prepend radiotap information */
285         if (!(status->flag & RX_FLAG_RADIOTAP))
286                 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
287                                                  needed_headroom);
288
289         skb_reset_mac_header(skb);
290         skb->ip_summed = CHECKSUM_UNNECESSARY;
291         skb->pkt_type = PACKET_OTHERHOST;
292         skb->protocol = htons(ETH_P_802_2);
293
294         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
295                 if (!netif_running(sdata->dev))
296                         continue;
297
298                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
299                         continue;
300
301                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302                         continue;
303
304                 if (prev_dev) {
305                         skb2 = skb_clone(skb, GFP_ATOMIC);
306                         if (skb2) {
307                                 skb2->dev = prev_dev;
308                                 netif_rx(skb2);
309                         }
310                 }
311
312                 prev_dev = sdata->dev;
313                 sdata->dev->stats.rx_packets++;
314                 sdata->dev->stats.rx_bytes += skb->len;
315         }
316
317         if (prev_dev) {
318                 skb->dev = prev_dev;
319                 netif_rx(skb);
320         } else
321                 dev_kfree_skb(skb);
322
323         return origskb;
324 }
325
326
327 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
328 {
329         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
330         int tid;
331
332         /* does the frame have a qos control field? */
333         if (ieee80211_is_data_qos(hdr->frame_control)) {
334                 u8 *qc = ieee80211_get_qos_ctl(hdr);
335                 /* frame has qos control */
336                 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
337                 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
338                         rx->flags |= IEEE80211_RX_AMSDU;
339                 else
340                         rx->flags &= ~IEEE80211_RX_AMSDU;
341         } else {
342                 /*
343                  * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
344                  *
345                  *      Sequence numbers for management frames, QoS data
346                  *      frames with a broadcast/multicast address in the
347                  *      Address 1 field, and all non-QoS data frames sent
348                  *      by QoS STAs are assigned using an additional single
349                  *      modulo-4096 counter, [...]
350                  *
351                  * We also use that counter for non-QoS STAs.
352                  */
353                 tid = NUM_RX_DATA_QUEUES - 1;
354         }
355
356         rx->queue = tid;
357         /* Set skb->priority to 1d tag if highest order bit of TID is not set.
358          * For now, set skb->priority to 0 for other cases. */
359         rx->skb->priority = (tid > 7) ? 0 : tid;
360 }
361
362 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
363 {
364 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
365         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
366         int hdrlen;
367
368         if (!ieee80211_is_data_present(hdr->frame_control))
369                 return;
370
371         /*
372          * Drivers are required to align the payload data in a way that
373          * guarantees that the contained IP header is aligned to a four-
374          * byte boundary. In the case of regular frames, this simply means
375          * aligning the payload to a four-byte boundary (because either
376          * the IP header is directly contained, or IV/RFC1042 headers that
377          * have a length divisible by four are in front of it.
378          *
379          * With A-MSDU frames, however, the payload data address must
380          * yield two modulo four because there are 14-byte 802.3 headers
381          * within the A-MSDU frames that push the IP header further back
382          * to a multiple of four again. Thankfully, the specs were sane
383          * enough this time around to require padding each A-MSDU subframe
384          * to a length that is a multiple of four.
385          *
386          * Padding like atheros hardware adds which is inbetween the 802.11
387          * header and the payload is not supported, the driver is required
388          * to move the 802.11 header further back in that case.
389          */
390         hdrlen = ieee80211_hdrlen(hdr->frame_control);
391         if (rx->flags & IEEE80211_RX_AMSDU)
392                 hdrlen += ETH_HLEN;
393         WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
394 #endif
395 }
396
397
398 /* rx handlers */
399
400 static ieee80211_rx_result debug_noinline
401 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
402 {
403         struct ieee80211_local *local = rx->local;
404         struct sk_buff *skb = rx->skb;
405
406         if (unlikely(local->hw_scanning))
407                 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
408
409         if (unlikely(local->sw_scanning)) {
410                 /* drop all the other packets during a software scan anyway */
411                 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
412                     != RX_QUEUED)
413                         dev_kfree_skb(skb);
414                 return RX_QUEUED;
415         }
416
417         if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
418                 /* scanning finished during invoking of handlers */
419                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
420                 return RX_DROP_UNUSABLE;
421         }
422
423         return RX_CONTINUE;
424 }
425
426 static ieee80211_rx_result
427 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
428 {
429         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
430         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
431
432         if (ieee80211_is_data(hdr->frame_control)) {
433                 if (!ieee80211_has_a4(hdr->frame_control))
434                         return RX_DROP_MONITOR;
435                 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
436                         return RX_DROP_MONITOR;
437         }
438
439         /* If there is not an established peer link and this is not a peer link
440          * establisment frame, beacon or probe, drop the frame.
441          */
442
443         if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
444                 struct ieee80211_mgmt *mgmt;
445
446                 if (!ieee80211_is_mgmt(hdr->frame_control))
447                         return RX_DROP_MONITOR;
448
449                 if (ieee80211_is_action(hdr->frame_control)) {
450                         mgmt = (struct ieee80211_mgmt *)hdr;
451                         if (mgmt->u.action.category != PLINK_CATEGORY)
452                                 return RX_DROP_MONITOR;
453                         return RX_CONTINUE;
454                 }
455
456                 if (ieee80211_is_probe_req(hdr->frame_control) ||
457                     ieee80211_is_probe_resp(hdr->frame_control) ||
458                     ieee80211_is_beacon(hdr->frame_control))
459                         return RX_CONTINUE;
460
461                 return RX_DROP_MONITOR;
462
463         }
464
465 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
466
467         if (ieee80211_is_data(hdr->frame_control) &&
468             is_multicast_ether_addr(hdr->addr1) &&
469             mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
470                 return RX_DROP_MONITOR;
471 #undef msh_h_get
472
473         return RX_CONTINUE;
474 }
475
476
477 static ieee80211_rx_result debug_noinline
478 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
479 {
480         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
481
482         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
483         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
484                 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
485                              rx->sta->last_seq_ctrl[rx->queue] ==
486                              hdr->seq_ctrl)) {
487                         if (rx->flags & IEEE80211_RX_RA_MATCH) {
488                                 rx->local->dot11FrameDuplicateCount++;
489                                 rx->sta->num_duplicates++;
490                         }
491                         return RX_DROP_MONITOR;
492                 } else
493                         rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
494         }
495
496         if (unlikely(rx->skb->len < 16)) {
497                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
498                 return RX_DROP_MONITOR;
499         }
500
501         /* Drop disallowed frame classes based on STA auth/assoc state;
502          * IEEE 802.11, Chap 5.5.
503          *
504          * mac80211 filters only based on association state, i.e. it drops
505          * Class 3 frames from not associated stations. hostapd sends
506          * deauth/disassoc frames when needed. In addition, hostapd is
507          * responsible for filtering on both auth and assoc states.
508          */
509
510         if (ieee80211_vif_is_mesh(&rx->sdata->vif))
511                 return ieee80211_rx_mesh_check(rx);
512
513         if (unlikely((ieee80211_is_data(hdr->frame_control) ||
514                       ieee80211_is_pspoll(hdr->frame_control)) &&
515                      rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
516                      (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
517                 if ((!ieee80211_has_fromds(hdr->frame_control) &&
518                      !ieee80211_has_tods(hdr->frame_control) &&
519                      ieee80211_is_data(hdr->frame_control)) ||
520                     !(rx->flags & IEEE80211_RX_RA_MATCH)) {
521                         /* Drop IBSS frames and frames for other hosts
522                          * silently. */
523                         return RX_DROP_MONITOR;
524                 }
525
526                 return RX_DROP_MONITOR;
527         }
528
529         return RX_CONTINUE;
530 }
531
532
533 static ieee80211_rx_result debug_noinline
534 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
535 {
536         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
537         int keyidx;
538         int hdrlen;
539         ieee80211_rx_result result = RX_DROP_UNUSABLE;
540         struct ieee80211_key *stakey = NULL;
541
542         /*
543          * Key selection 101
544          *
545          * There are three types of keys:
546          *  - GTK (group keys)
547          *  - PTK (pairwise keys)
548          *  - STK (station-to-station pairwise keys)
549          *
550          * When selecting a key, we have to distinguish between multicast
551          * (including broadcast) and unicast frames, the latter can only
552          * use PTKs and STKs while the former always use GTKs. Unless, of
553          * course, actual WEP keys ("pre-RSNA") are used, then unicast
554          * frames can also use key indizes like GTKs. Hence, if we don't
555          * have a PTK/STK we check the key index for a WEP key.
556          *
557          * Note that in a regular BSS, multicast frames are sent by the
558          * AP only, associated stations unicast the frame to the AP first
559          * which then multicasts it on their behalf.
560          *
561          * There is also a slight problem in IBSS mode: GTKs are negotiated
562          * with each station, that is something we don't currently handle.
563          * The spec seems to expect that one negotiates the same key with
564          * every station but there's no such requirement; VLANs could be
565          * possible.
566          */
567
568         if (!ieee80211_has_protected(hdr->frame_control))
569                 return RX_CONTINUE;
570
571         /*
572          * No point in finding a key and decrypting if the frame is neither
573          * addressed to us nor a multicast frame.
574          */
575         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
576                 return RX_CONTINUE;
577
578         if (rx->sta)
579                 stakey = rcu_dereference(rx->sta->key);
580
581         if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
582                 rx->key = stakey;
583         } else {
584                 /*
585                  * The device doesn't give us the IV so we won't be
586                  * able to look up the key. That's ok though, we
587                  * don't need to decrypt the frame, we just won't
588                  * be able to keep statistics accurate.
589                  * Except for key threshold notifications, should
590                  * we somehow allow the driver to tell us which key
591                  * the hardware used if this flag is set?
592                  */
593                 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
594                     (rx->status->flag & RX_FLAG_IV_STRIPPED))
595                         return RX_CONTINUE;
596
597                 hdrlen = ieee80211_hdrlen(hdr->frame_control);
598
599                 if (rx->skb->len < 8 + hdrlen)
600                         return RX_DROP_UNUSABLE; /* TODO: count this? */
601
602                 /*
603                  * no need to call ieee80211_wep_get_keyidx,
604                  * it verifies a bunch of things we've done already
605                  */
606                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
607
608                 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
609
610                 /*
611                  * RSNA-protected unicast frames should always be sent with
612                  * pairwise or station-to-station keys, but for WEP we allow
613                  * using a key index as well.
614                  */
615                 if (rx->key && rx->key->conf.alg != ALG_WEP &&
616                     !is_multicast_ether_addr(hdr->addr1))
617                         rx->key = NULL;
618         }
619
620         if (rx->key) {
621                 rx->key->tx_rx_count++;
622                 /* TODO: add threshold stuff again */
623         } else {
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             ieee80211_is_data(hdr->frame_control) &&
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 sta_info *sta)
654 {
655         struct ieee80211_sub_if_data *sdata = sta->sdata;
656         DECLARE_MAC_BUF(mac);
657
658         atomic_inc(&sdata->bss->num_sta_ps);
659         set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
660 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
661         printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
662                sdata->dev->name, print_mac(mac, sta->sta.addr), sta->sta.aid);
663 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
664 }
665
666 static int ap_sta_ps_end(struct sta_info *sta)
667 {
668         struct ieee80211_sub_if_data *sdata = sta->sdata;
669         struct ieee80211_local *local = sdata->local;
670         struct sk_buff *skb;
671         int sent = 0;
672         struct ieee80211_tx_info *info;
673         DECLARE_MAC_BUF(mac);
674
675         atomic_dec(&sdata->bss->num_sta_ps);
676
677         clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
678
679         if (!skb_queue_empty(&sta->ps_tx_buf))
680                 sta_info_clear_tim_bit(sta);
681
682 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
683         printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
684                sdata->dev->name, print_mac(mac, sta->sta.addr), sta->sta.aid);
685 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
686
687         /* Send all buffered frames to the station */
688         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
689                 info = IEEE80211_SKB_CB(skb);
690                 sent++;
691                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
692                 dev_queue_xmit(skb);
693         }
694         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
695                 info = IEEE80211_SKB_CB(skb);
696                 local->total_ps_buffered--;
697                 sent++;
698 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
699                 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
700                        "since STA not sleeping anymore\n", sdata->dev->name,
701                        print_mac(mac, sta->sta.addr), sta->sta.aid);
702 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
703                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
704                 dev_queue_xmit(skb);
705         }
706
707         return sent;
708 }
709
710 static ieee80211_rx_result debug_noinline
711 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
712 {
713         struct sta_info *sta = rx->sta;
714         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
715
716         if (!sta)
717                 return RX_CONTINUE;
718
719         /* Update last_rx only for IBSS packets which are for the current
720          * BSSID to avoid keeping the current IBSS network alive in cases where
721          * other STAs are using different BSSID. */
722         if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
723                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
724                                                 NL80211_IFTYPE_ADHOC);
725                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
726                         sta->last_rx = jiffies;
727         } else
728         if (!is_multicast_ether_addr(hdr->addr1) ||
729             rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
730                 /* Update last_rx only for unicast frames in order to prevent
731                  * the Probe Request frames (the only broadcast frames from a
732                  * STA in infrastructure mode) from keeping a connection alive.
733                  * Mesh beacons will update last_rx when if they are found to
734                  * match the current local configuration when processed.
735                  */
736                 sta->last_rx = jiffies;
737         }
738
739         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
740                 return RX_CONTINUE;
741
742         sta->rx_fragments++;
743         sta->rx_bytes += rx->skb->len;
744         sta->last_signal = rx->status->signal;
745         sta->last_qual = rx->status->qual;
746         sta->last_noise = rx->status->noise;
747
748         if (!ieee80211_has_morefrags(hdr->frame_control) &&
749             (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
750              rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
751                 /* Change STA power saving mode only in the end of a frame
752                  * exchange sequence */
753                 if (test_sta_flags(sta, WLAN_STA_PS) &&
754                     !ieee80211_has_pm(hdr->frame_control))
755                         rx->sent_ps_buffered += ap_sta_ps_end(sta);
756                 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
757                          ieee80211_has_pm(hdr->frame_control))
758                         ap_sta_ps_start(sta);
759         }
760
761         /* Drop data::nullfunc frames silently, since they are used only to
762          * control station power saving mode. */
763         if (ieee80211_is_nullfunc(hdr->frame_control)) {
764                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
765                 /* Update counter and free packet here to avoid counting this
766                  * as a dropped packed. */
767                 sta->rx_packets++;
768                 dev_kfree_skb(rx->skb);
769                 return RX_QUEUED;
770         }
771
772         return RX_CONTINUE;
773 } /* ieee80211_rx_h_sta_process */
774
775 static inline struct ieee80211_fragment_entry *
776 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
777                          unsigned int frag, unsigned int seq, int rx_queue,
778                          struct sk_buff **skb)
779 {
780         struct ieee80211_fragment_entry *entry;
781         int idx;
782
783         idx = sdata->fragment_next;
784         entry = &sdata->fragments[sdata->fragment_next++];
785         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
786                 sdata->fragment_next = 0;
787
788         if (!skb_queue_empty(&entry->skb_list)) {
789 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
790                 struct ieee80211_hdr *hdr =
791                         (struct ieee80211_hdr *) entry->skb_list.next->data;
792                 DECLARE_MAC_BUF(mac);
793                 DECLARE_MAC_BUF(mac2);
794                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
795                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
796                        "addr1=%s addr2=%s\n",
797                        sdata->dev->name, idx,
798                        jiffies - entry->first_frag_time, entry->seq,
799                        entry->last_frag, print_mac(mac, hdr->addr1),
800                        print_mac(mac2, hdr->addr2));
801 #endif
802                 __skb_queue_purge(&entry->skb_list);
803         }
804
805         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
806         *skb = NULL;
807         entry->first_frag_time = jiffies;
808         entry->seq = seq;
809         entry->rx_queue = rx_queue;
810         entry->last_frag = frag;
811         entry->ccmp = 0;
812         entry->extra_len = 0;
813
814         return entry;
815 }
816
817 static inline struct ieee80211_fragment_entry *
818 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
819                           unsigned int frag, unsigned int seq,
820                           int rx_queue, struct ieee80211_hdr *hdr)
821 {
822         struct ieee80211_fragment_entry *entry;
823         int i, idx;
824
825         idx = sdata->fragment_next;
826         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
827                 struct ieee80211_hdr *f_hdr;
828
829                 idx--;
830                 if (idx < 0)
831                         idx = IEEE80211_FRAGMENT_MAX - 1;
832
833                 entry = &sdata->fragments[idx];
834                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
835                     entry->rx_queue != rx_queue ||
836                     entry->last_frag + 1 != frag)
837                         continue;
838
839                 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
840
841                 /*
842                  * Check ftype and addresses are equal, else check next fragment
843                  */
844                 if (((hdr->frame_control ^ f_hdr->frame_control) &
845                      cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
846                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
847                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
848                         continue;
849
850                 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
851                         __skb_queue_purge(&entry->skb_list);
852                         continue;
853                 }
854                 return entry;
855         }
856
857         return NULL;
858 }
859
860 static ieee80211_rx_result debug_noinline
861 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
862 {
863         struct ieee80211_hdr *hdr;
864         u16 sc;
865         __le16 fc;
866         unsigned int frag, seq;
867         struct ieee80211_fragment_entry *entry;
868         struct sk_buff *skb;
869         DECLARE_MAC_BUF(mac);
870
871         hdr = (struct ieee80211_hdr *)rx->skb->data;
872         fc = hdr->frame_control;
873         sc = le16_to_cpu(hdr->seq_ctrl);
874         frag = sc & IEEE80211_SCTL_FRAG;
875
876         if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
877                    (rx->skb)->len < 24 ||
878                    is_multicast_ether_addr(hdr->addr1))) {
879                 /* not fragmented */
880                 goto out;
881         }
882         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
883
884         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
885
886         if (frag == 0) {
887                 /* This is the first fragment of a new frame. */
888                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
889                                                  rx->queue, &(rx->skb));
890                 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
891                     ieee80211_has_protected(fc)) {
892                         /* Store CCMP PN so that we can verify that the next
893                          * fragment has a sequential PN value. */
894                         entry->ccmp = 1;
895                         memcpy(entry->last_pn,
896                                rx->key->u.ccmp.rx_pn[rx->queue],
897                                CCMP_PN_LEN);
898                 }
899                 return RX_QUEUED;
900         }
901
902         /* This is a fragment for a frame that should already be pending in
903          * fragment cache. Add this fragment to the end of the pending entry.
904          */
905         entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
906         if (!entry) {
907                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
908                 return RX_DROP_MONITOR;
909         }
910
911         /* Verify that MPDUs within one MSDU have sequential PN values.
912          * (IEEE 802.11i, 8.3.3.4.5) */
913         if (entry->ccmp) {
914                 int i;
915                 u8 pn[CCMP_PN_LEN], *rpn;
916                 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
917                         return RX_DROP_UNUSABLE;
918                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
919                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
920                         pn[i]++;
921                         if (pn[i])
922                                 break;
923                 }
924                 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
925                 if (memcmp(pn, rpn, CCMP_PN_LEN))
926                         return RX_DROP_UNUSABLE;
927                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
928         }
929
930         skb_pull(rx->skb, ieee80211_hdrlen(fc));
931         __skb_queue_tail(&entry->skb_list, rx->skb);
932         entry->last_frag = frag;
933         entry->extra_len += rx->skb->len;
934         if (ieee80211_has_morefrags(fc)) {
935                 rx->skb = NULL;
936                 return RX_QUEUED;
937         }
938
939         rx->skb = __skb_dequeue(&entry->skb_list);
940         if (skb_tailroom(rx->skb) < entry->extra_len) {
941                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
942                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
943                                               GFP_ATOMIC))) {
944                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
945                         __skb_queue_purge(&entry->skb_list);
946                         return RX_DROP_UNUSABLE;
947                 }
948         }
949         while ((skb = __skb_dequeue(&entry->skb_list))) {
950                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
951                 dev_kfree_skb(skb);
952         }
953
954         /* Complete frame has been reassembled - process it now */
955         rx->flags |= IEEE80211_RX_FRAGMENTED;
956
957  out:
958         if (rx->sta)
959                 rx->sta->rx_packets++;
960         if (is_multicast_ether_addr(hdr->addr1))
961                 rx->local->dot11MulticastReceivedFrameCount++;
962         else
963                 ieee80211_led_rx(rx->local);
964         return RX_CONTINUE;
965 }
966
967 static ieee80211_rx_result debug_noinline
968 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
969 {
970         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
971         struct sk_buff *skb;
972         int no_pending_pkts;
973         DECLARE_MAC_BUF(mac);
974         __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
975
976         if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
977                    !(rx->flags & IEEE80211_RX_RA_MATCH)))
978                 return RX_CONTINUE;
979
980         if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
981             (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
982                 return RX_DROP_UNUSABLE;
983
984         skb = skb_dequeue(&rx->sta->tx_filtered);
985         if (!skb) {
986                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
987                 if (skb)
988                         rx->local->total_ps_buffered--;
989         }
990         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
991                 skb_queue_empty(&rx->sta->ps_tx_buf);
992
993         if (skb) {
994                 struct ieee80211_hdr *hdr =
995                         (struct ieee80211_hdr *) skb->data;
996
997                 /*
998                  * Tell TX path to send one frame even though the STA may
999                  * still remain is PS mode after this frame exchange.
1000                  */
1001                 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1002
1003 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1004                 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1005                        print_mac(mac, rx->sta->sta.addr), rx->sta->sta.aid,
1006                        skb_queue_len(&rx->sta->ps_tx_buf));
1007 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1008
1009                 /* Use MoreData flag to indicate whether there are more
1010                  * buffered frames for this STA */
1011                 if (no_pending_pkts)
1012                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1013                 else
1014                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1015
1016                 dev_queue_xmit(skb);
1017
1018                 if (no_pending_pkts)
1019                         sta_info_clear_tim_bit(rx->sta);
1020 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1021         } else if (!rx->sent_ps_buffered) {
1022                 /*
1023                  * FIXME: This can be the result of a race condition between
1024                  *        us expiring a frame and the station polling for it.
1025                  *        Should we send it a null-func frame indicating we
1026                  *        have nothing buffered for it?
1027                  */
1028                 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
1029                        "though there are no buffered frames for it\n",
1030                        rx->dev->name, print_mac(mac, rx->sta->sta.addr));
1031 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1032         }
1033
1034         /* Free PS Poll skb here instead of returning RX_DROP that would
1035          * count as an dropped frame. */
1036         dev_kfree_skb(rx->skb);
1037
1038         return RX_QUEUED;
1039 }
1040
1041 static ieee80211_rx_result debug_noinline
1042 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1043 {
1044         u8 *data = rx->skb->data;
1045         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1046
1047         if (!ieee80211_is_data_qos(hdr->frame_control))
1048                 return RX_CONTINUE;
1049
1050         /* remove the qos control field, update frame type and meta-data */
1051         memmove(data + IEEE80211_QOS_CTL_LEN, data,
1052                 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1053         hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1054         /* change frame type to non QOS */
1055         hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1056
1057         return RX_CONTINUE;
1058 }
1059
1060 static int
1061 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1062 {
1063         if (unlikely(!rx->sta ||
1064             !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1065                 return -EACCES;
1066
1067         return 0;
1068 }
1069
1070 static int
1071 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1072 {
1073         /*
1074          * Pass through unencrypted frames if the hardware has
1075          * decrypted them already.
1076          */
1077         if (rx->status->flag & RX_FLAG_DECRYPTED)
1078                 return 0;
1079
1080         /* Drop unencrypted frames if key is set. */
1081         if (unlikely(!ieee80211_has_protected(fc) &&
1082                      !ieee80211_is_nullfunc(fc) &&
1083                      (rx->key || rx->sdata->drop_unencrypted)))
1084                 return -EACCES;
1085
1086         return 0;
1087 }
1088
1089 static int
1090 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1091 {
1092         struct net_device *dev = rx->dev;
1093         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1094         u16 hdrlen, ethertype;
1095         u8 *payload;
1096         u8 dst[ETH_ALEN];
1097         u8 src[ETH_ALEN] __aligned(2);
1098         struct sk_buff *skb = rx->skb;
1099         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1100         DECLARE_MAC_BUF(mac);
1101         DECLARE_MAC_BUF(mac2);
1102         DECLARE_MAC_BUF(mac3);
1103         DECLARE_MAC_BUF(mac4);
1104
1105         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1106                 return -1;
1107
1108         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1109
1110         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1111          * header
1112          * IEEE 802.11 address fields:
1113          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1114          *   0     0   DA    SA    BSSID n/a
1115          *   0     1   DA    BSSID SA    n/a
1116          *   1     0   BSSID SA    DA    n/a
1117          *   1     1   RA    TA    DA    SA
1118          */
1119         memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1120         memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1121
1122         switch (hdr->frame_control &
1123                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1124         case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
1125                 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1126                              sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1127                         return -1;
1128                 break;
1129         case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1130                 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1131                              sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1132                         return -1;
1133                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1134                         struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1135                                 (skb->data + hdrlen);
1136                         hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1137                         if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1138                                 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1139                                 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1140                         }
1141                 }
1142                 break;
1143         case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
1144                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1145                     (is_multicast_ether_addr(dst) &&
1146                      !compare_ether_addr(src, dev->dev_addr)))
1147                         return -1;
1148                 break;
1149         case __constant_cpu_to_le16(0):
1150                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1151                         return -1;
1152                 break;
1153         }
1154
1155         if (unlikely(skb->len - hdrlen < 8))
1156                 return -1;
1157
1158         payload = skb->data + hdrlen;
1159         ethertype = (payload[6] << 8) | payload[7];
1160
1161         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1162                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1163                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1164                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1165                  * replace EtherType */
1166                 skb_pull(skb, hdrlen + 6);
1167                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1168                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1169         } else {
1170                 struct ethhdr *ehdr;
1171                 __be16 len;
1172
1173                 skb_pull(skb, hdrlen);
1174                 len = htons(skb->len);
1175                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1176                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1177                 memcpy(ehdr->h_source, src, ETH_ALEN);
1178                 ehdr->h_proto = len;
1179         }
1180         return 0;
1181 }
1182
1183 /*
1184  * requires that rx->skb is a frame with ethernet header
1185  */
1186 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1187 {
1188         static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1189                 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1190         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1191
1192         /*
1193          * Allow EAPOL frames to us/the PAE group address regardless
1194          * of whether the frame was encrypted or not.
1195          */
1196         if (ehdr->h_proto == htons(ETH_P_PAE) &&
1197             (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1198              compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1199                 return true;
1200
1201         if (ieee80211_802_1x_port_control(rx) ||
1202             ieee80211_drop_unencrypted(rx, fc))
1203                 return false;
1204
1205         return true;
1206 }
1207
1208 /*
1209  * requires that rx->skb is a frame with ethernet header
1210  */
1211 static void
1212 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1213 {
1214         struct net_device *dev = rx->dev;
1215         struct ieee80211_local *local = rx->local;
1216         struct sk_buff *skb, *xmit_skb;
1217         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1218         struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1219         struct sta_info *dsta;
1220
1221         skb = rx->skb;
1222         xmit_skb = NULL;
1223
1224         if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1225              sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1226             !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1227             (rx->flags & IEEE80211_RX_RA_MATCH)) {
1228                 if (is_multicast_ether_addr(ehdr->h_dest)) {
1229                         /*
1230                          * send multicast frames both to higher layers in
1231                          * local net stack and back to the wireless medium
1232                          */
1233                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
1234                         if (!xmit_skb && net_ratelimit())
1235                                 printk(KERN_DEBUG "%s: failed to clone "
1236                                        "multicast frame\n", dev->name);
1237                 } else {
1238                         dsta = sta_info_get(local, skb->data);
1239                         if (dsta && dsta->sdata->dev == dev) {
1240                                 /*
1241                                  * The destination station is associated to
1242                                  * this AP (in this VLAN), so send the frame
1243                                  * directly to it and do not pass it to local
1244                                  * net stack.
1245                                  */
1246                                 xmit_skb = skb;
1247                                 skb = NULL;
1248                         }
1249                 }
1250         }
1251
1252         if (skb) {
1253                 /* deliver to local stack */
1254                 skb->protocol = eth_type_trans(skb, dev);
1255                 memset(skb->cb, 0, sizeof(skb->cb));
1256                 netif_rx(skb);
1257         }
1258
1259         if (xmit_skb) {
1260                 /* send to wireless media */
1261                 xmit_skb->protocol = htons(ETH_P_802_3);
1262                 skb_reset_network_header(xmit_skb);
1263                 skb_reset_mac_header(xmit_skb);
1264                 dev_queue_xmit(xmit_skb);
1265         }
1266 }
1267
1268 static ieee80211_rx_result debug_noinline
1269 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1270 {
1271         struct net_device *dev = rx->dev;
1272         struct ieee80211_local *local = rx->local;
1273         u16 ethertype;
1274         u8 *payload;
1275         struct sk_buff *skb = rx->skb, *frame = NULL;
1276         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277         __le16 fc = hdr->frame_control;
1278         const struct ethhdr *eth;
1279         int remaining, err;
1280         u8 dst[ETH_ALEN];
1281         u8 src[ETH_ALEN];
1282         DECLARE_MAC_BUF(mac);
1283
1284         if (unlikely(!ieee80211_is_data(fc)))
1285                 return RX_CONTINUE;
1286
1287         if (unlikely(!ieee80211_is_data_present(fc)))
1288                 return RX_DROP_MONITOR;
1289
1290         if (!(rx->flags & IEEE80211_RX_AMSDU))
1291                 return RX_CONTINUE;
1292
1293         err = ieee80211_data_to_8023(rx);
1294         if (unlikely(err))
1295                 return RX_DROP_UNUSABLE;
1296
1297         skb->dev = dev;
1298
1299         dev->stats.rx_packets++;
1300         dev->stats.rx_bytes += skb->len;
1301
1302         /* skip the wrapping header */
1303         eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1304         if (!eth)
1305                 return RX_DROP_UNUSABLE;
1306
1307         while (skb != frame) {
1308                 u8 padding;
1309                 __be16 len = eth->h_proto;
1310                 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1311
1312                 remaining = skb->len;
1313                 memcpy(dst, eth->h_dest, ETH_ALEN);
1314                 memcpy(src, eth->h_source, ETH_ALEN);
1315
1316                 padding = ((4 - subframe_len) & 0x3);
1317                 /* the last MSDU has no padding */
1318                 if (subframe_len > remaining)
1319                         return RX_DROP_UNUSABLE;
1320
1321                 skb_pull(skb, sizeof(struct ethhdr));
1322                 /* if last subframe reuse skb */
1323                 if (remaining <= subframe_len + padding)
1324                         frame = skb;
1325                 else {
1326                         frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1327                                               subframe_len);
1328
1329                         if (frame == NULL)
1330                                 return RX_DROP_UNUSABLE;
1331
1332                         skb_reserve(frame, local->hw.extra_tx_headroom +
1333                                     sizeof(struct ethhdr));
1334                         memcpy(skb_put(frame, ntohs(len)), skb->data,
1335                                 ntohs(len));
1336
1337                         eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1338                                                         padding);
1339                         if (!eth) {
1340                                 dev_kfree_skb(frame);
1341                                 return RX_DROP_UNUSABLE;
1342                         }
1343                 }
1344
1345                 skb_reset_network_header(frame);
1346                 frame->dev = dev;
1347                 frame->priority = skb->priority;
1348                 rx->skb = frame;
1349
1350                 payload = frame->data;
1351                 ethertype = (payload[6] << 8) | payload[7];
1352
1353                 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1354                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1355                            compare_ether_addr(payload,
1356                                               bridge_tunnel_header) == 0)) {
1357                         /* remove RFC1042 or Bridge-Tunnel
1358                          * encapsulation and replace EtherType */
1359                         skb_pull(frame, 6);
1360                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1361                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1362                 } else {
1363                         memcpy(skb_push(frame, sizeof(__be16)),
1364                                &len, sizeof(__be16));
1365                         memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1366                         memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1367                 }
1368
1369                 if (!ieee80211_frame_allowed(rx, fc)) {
1370                         if (skb == frame) /* last frame */
1371                                 return RX_DROP_UNUSABLE;
1372                         dev_kfree_skb(frame);
1373                         continue;
1374                 }
1375
1376                 ieee80211_deliver_skb(rx);
1377         }
1378
1379         return RX_QUEUED;
1380 }
1381
1382 #ifdef CONFIG_MAC80211_MESH
1383 static ieee80211_rx_result
1384 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1385 {
1386         struct ieee80211_hdr *hdr;
1387         struct ieee80211s_hdr *mesh_hdr;
1388         unsigned int hdrlen;
1389         struct sk_buff *skb = rx->skb, *fwd_skb;
1390
1391         hdr = (struct ieee80211_hdr *) skb->data;
1392         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1393         mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1394
1395         if (!ieee80211_is_data(hdr->frame_control))
1396                 return RX_CONTINUE;
1397
1398         if (!mesh_hdr->ttl)
1399                 /* illegal frame */
1400                 return RX_DROP_MONITOR;
1401
1402         if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1403                 struct ieee80211_sub_if_data *sdata;
1404                 struct mesh_path *mppath;
1405
1406                 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1407                 rcu_read_lock();
1408                 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1409                 if (!mppath) {
1410                         mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1411                 } else {
1412                         spin_lock_bh(&mppath->state_lock);
1413                         mppath->exp_time = jiffies;
1414                         if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1415                                 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1416                         spin_unlock_bh(&mppath->state_lock);
1417                 }
1418                 rcu_read_unlock();
1419         }
1420
1421         if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1422                 return RX_CONTINUE;
1423
1424         mesh_hdr->ttl--;
1425
1426         if (rx->flags & IEEE80211_RX_RA_MATCH) {
1427                 if (!mesh_hdr->ttl)
1428                         IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1429                                                      dropped_frames_ttl);
1430                 else {
1431                         struct ieee80211_hdr *fwd_hdr;
1432                         fwd_skb = skb_copy(skb, GFP_ATOMIC);
1433
1434                         if (!fwd_skb && net_ratelimit())
1435                                 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1436                                                    rx->dev->name);
1437
1438                         fwd_hdr =  (struct ieee80211_hdr *) fwd_skb->data;
1439                         /*
1440                          * Save TA to addr1 to send TA a path error if a
1441                          * suitable next hop is not found
1442                          */
1443                         memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1444                         memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1445                         fwd_skb->dev = rx->local->mdev;
1446                         fwd_skb->iif = rx->dev->ifindex;
1447                         dev_queue_xmit(fwd_skb);
1448                 }
1449         }
1450
1451         if (is_multicast_ether_addr(hdr->addr3) ||
1452             rx->dev->flags & IFF_PROMISC)
1453                 return RX_CONTINUE;
1454         else
1455                 return RX_DROP_MONITOR;
1456 }
1457 #endif
1458
1459 static ieee80211_rx_result debug_noinline
1460 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1461 {
1462         struct net_device *dev = rx->dev;
1463         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1464         __le16 fc = hdr->frame_control;
1465         int err;
1466
1467         if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1468                 return RX_CONTINUE;
1469
1470         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1471                 return RX_DROP_MONITOR;
1472
1473         err = ieee80211_data_to_8023(rx);
1474         if (unlikely(err))
1475                 return RX_DROP_UNUSABLE;
1476
1477         if (!ieee80211_frame_allowed(rx, fc))
1478                 return RX_DROP_MONITOR;
1479
1480         rx->skb->dev = dev;
1481
1482         dev->stats.rx_packets++;
1483         dev->stats.rx_bytes += rx->skb->len;
1484
1485         ieee80211_deliver_skb(rx);
1486
1487         return RX_QUEUED;
1488 }
1489
1490 static ieee80211_rx_result debug_noinline
1491 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1492 {
1493         struct ieee80211_local *local = rx->local;
1494         struct ieee80211_hw *hw = &local->hw;
1495         struct sk_buff *skb = rx->skb;
1496         struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1497         struct tid_ampdu_rx *tid_agg_rx;
1498         u16 start_seq_num;
1499         u16 tid;
1500
1501         if (likely(!ieee80211_is_ctl(bar->frame_control)))
1502                 return RX_CONTINUE;
1503
1504         if (ieee80211_is_back_req(bar->frame_control)) {
1505                 if (!rx->sta)
1506                         return RX_CONTINUE;
1507                 tid = le16_to_cpu(bar->control) >> 12;
1508                 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1509                                         != HT_AGG_STATE_OPERATIONAL)
1510                         return RX_CONTINUE;
1511                 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1512
1513                 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1514
1515                 /* reset session timer */
1516                 if (tid_agg_rx->timeout) {
1517                         unsigned long expires =
1518                                 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1519                         mod_timer(&tid_agg_rx->session_timer, expires);
1520                 }
1521
1522                 /* manage reordering buffer according to requested */
1523                 /* sequence number */
1524                 rcu_read_lock();
1525                 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1526                                                  start_seq_num, 1);
1527                 rcu_read_unlock();
1528                 return RX_DROP_UNUSABLE;
1529         }
1530
1531         return RX_CONTINUE;
1532 }
1533
1534 static ieee80211_rx_result debug_noinline
1535 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1536 {
1537         struct ieee80211_local *local = rx->local;
1538         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1539         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1540         int len = rx->skb->len;
1541
1542         if (!ieee80211_is_action(mgmt->frame_control))
1543                 return RX_CONTINUE;
1544
1545         if (!rx->sta)
1546                 return RX_DROP_MONITOR;
1547
1548         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1549                 return RX_DROP_MONITOR;
1550
1551         /* all categories we currently handle have action_code */
1552         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1553                 return RX_DROP_MONITOR;
1554
1555         /*
1556          * FIXME: revisit this, I'm sure we should handle most
1557          *        of these frames in other modes as well!
1558          */
1559         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1560             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1561                 return RX_CONTINUE;
1562
1563         switch (mgmt->u.action.category) {
1564         case WLAN_CATEGORY_BACK:
1565                 switch (mgmt->u.action.u.addba_req.action_code) {
1566                 case WLAN_ACTION_ADDBA_REQ:
1567                         if (len < (IEEE80211_MIN_ACTION_SIZE +
1568                                    sizeof(mgmt->u.action.u.addba_req)))
1569                                 return RX_DROP_MONITOR;
1570                         ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1571                         break;
1572                 case WLAN_ACTION_ADDBA_RESP:
1573                         if (len < (IEEE80211_MIN_ACTION_SIZE +
1574                                    sizeof(mgmt->u.action.u.addba_resp)))
1575                                 return RX_DROP_MONITOR;
1576                         ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1577                         break;
1578                 case WLAN_ACTION_DELBA:
1579                         if (len < (IEEE80211_MIN_ACTION_SIZE +
1580                                    sizeof(mgmt->u.action.u.delba)))
1581                                 return RX_DROP_MONITOR;
1582                         ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1583                         break;
1584                 }
1585                 break;
1586         case WLAN_CATEGORY_SPECTRUM_MGMT:
1587                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1588                         return RX_DROP_MONITOR;
1589                 switch (mgmt->u.action.u.measurement.action_code) {
1590                 case WLAN_ACTION_SPCT_MSR_REQ:
1591                         if (len < (IEEE80211_MIN_ACTION_SIZE +
1592                                    sizeof(mgmt->u.action.u.measurement)))
1593                                 return RX_DROP_MONITOR;
1594                         ieee80211_process_measurement_req(sdata, mgmt, len);
1595                         break;
1596                 }
1597                 break;
1598         default:
1599                 return RX_CONTINUE;
1600         }
1601
1602         rx->sta->rx_packets++;
1603         dev_kfree_skb(rx->skb);
1604         return RX_QUEUED;
1605 }
1606
1607 static ieee80211_rx_result debug_noinline
1608 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1609 {
1610         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1611
1612         if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1613                 return RX_DROP_MONITOR;
1614
1615         if (ieee80211_vif_is_mesh(&sdata->vif))
1616                 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1617
1618         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1619             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1620                 return RX_DROP_MONITOR;
1621
1622         if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
1623                 return RX_DROP_MONITOR;
1624
1625         ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1626         return RX_QUEUED;
1627 }
1628
1629 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1630                                             struct ieee80211_hdr *hdr,
1631                                             struct ieee80211_rx_data *rx)
1632 {
1633         int keyidx;
1634         unsigned int hdrlen;
1635         DECLARE_MAC_BUF(mac);
1636         DECLARE_MAC_BUF(mac2);
1637
1638         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1639         if (rx->skb->len >= hdrlen + 4)
1640                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1641         else
1642                 keyidx = -1;
1643
1644         if (!rx->sta) {
1645                 /*
1646                  * Some hardware seem to generate incorrect Michael MIC
1647                  * reports; ignore them to avoid triggering countermeasures.
1648                  */
1649                 goto ignore;
1650         }
1651
1652         if (!ieee80211_has_protected(hdr->frame_control))
1653                 goto ignore;
1654
1655         if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1656                 /*
1657                  * APs with pairwise keys should never receive Michael MIC
1658                  * errors for non-zero keyidx because these are reserved for
1659                  * group keys and only the AP is sending real multicast
1660                  * frames in the BSS.
1661                  */
1662                 goto ignore;
1663         }
1664
1665         if (!ieee80211_is_data(hdr->frame_control) &&
1666             !ieee80211_is_auth(hdr->frame_control))
1667                 goto ignore;
1668
1669         mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1670  ignore:
1671         dev_kfree_skb(rx->skb);
1672         rx->skb = NULL;
1673 }
1674
1675 /* TODO: use IEEE80211_RX_FRAGMENTED */
1676 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1677 {
1678         struct ieee80211_sub_if_data *sdata;
1679         struct ieee80211_local *local = rx->local;
1680         struct ieee80211_rtap_hdr {
1681                 struct ieee80211_radiotap_header hdr;
1682                 u8 flags;
1683                 u8 rate;
1684                 __le16 chan_freq;
1685                 __le16 chan_flags;
1686         } __attribute__ ((packed)) *rthdr;
1687         struct sk_buff *skb = rx->skb, *skb2;
1688         struct net_device *prev_dev = NULL;
1689         struct ieee80211_rx_status *status = rx->status;
1690
1691         if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1692                 goto out_free_skb;
1693
1694         if (skb_headroom(skb) < sizeof(*rthdr) &&
1695             pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1696                 goto out_free_skb;
1697
1698         rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1699         memset(rthdr, 0, sizeof(*rthdr));
1700         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1701         rthdr->hdr.it_present =
1702                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1703                             (1 << IEEE80211_RADIOTAP_RATE) |
1704                             (1 << IEEE80211_RADIOTAP_CHANNEL));
1705
1706         rthdr->rate = rx->rate->bitrate / 5;
1707         rthdr->chan_freq = cpu_to_le16(status->freq);
1708
1709         if (status->band == IEEE80211_BAND_5GHZ)
1710                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1711                                                 IEEE80211_CHAN_5GHZ);
1712         else
1713                 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1714                                                 IEEE80211_CHAN_2GHZ);
1715
1716         skb_set_mac_header(skb, 0);
1717         skb->ip_summed = CHECKSUM_UNNECESSARY;
1718         skb->pkt_type = PACKET_OTHERHOST;
1719         skb->protocol = htons(ETH_P_802_2);
1720
1721         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1722                 if (!netif_running(sdata->dev))
1723                         continue;
1724
1725                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1726                     !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1727                         continue;
1728
1729                 if (prev_dev) {
1730                         skb2 = skb_clone(skb, GFP_ATOMIC);
1731                         if (skb2) {
1732                                 skb2->dev = prev_dev;
1733                                 netif_rx(skb2);
1734                         }
1735                 }
1736
1737                 prev_dev = sdata->dev;
1738                 sdata->dev->stats.rx_packets++;
1739                 sdata->dev->stats.rx_bytes += skb->len;
1740         }
1741
1742         if (prev_dev) {
1743                 skb->dev = prev_dev;
1744                 netif_rx(skb);
1745                 skb = NULL;
1746         } else
1747                 goto out_free_skb;
1748
1749         rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1750         return;
1751
1752  out_free_skb:
1753         dev_kfree_skb(skb);
1754 }
1755
1756
1757 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1758                                          struct ieee80211_rx_data *rx,
1759                                          struct sk_buff *skb)
1760 {
1761         ieee80211_rx_result res = RX_DROP_MONITOR;
1762
1763         rx->skb = skb;
1764         rx->sdata = sdata;
1765         rx->dev = sdata->dev;
1766
1767 #define CALL_RXH(rxh)                   \
1768         do {                            \
1769                 res = rxh(rx);          \
1770                 if (res != RX_CONTINUE) \
1771                         goto rxh_done;  \
1772         } while (0);
1773
1774         CALL_RXH(ieee80211_rx_h_passive_scan)
1775         CALL_RXH(ieee80211_rx_h_check)
1776         CALL_RXH(ieee80211_rx_h_decrypt)
1777         CALL_RXH(ieee80211_rx_h_sta_process)
1778         CALL_RXH(ieee80211_rx_h_defragment)
1779         CALL_RXH(ieee80211_rx_h_ps_poll)
1780         CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1781         /* must be after MMIC verify so header is counted in MPDU mic */
1782         CALL_RXH(ieee80211_rx_h_remove_qos_control)
1783         CALL_RXH(ieee80211_rx_h_amsdu)
1784 #ifdef CONFIG_MAC80211_MESH
1785         if (ieee80211_vif_is_mesh(&sdata->vif))
1786                 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1787 #endif
1788         CALL_RXH(ieee80211_rx_h_data)
1789         CALL_RXH(ieee80211_rx_h_ctrl)
1790         CALL_RXH(ieee80211_rx_h_action)
1791         CALL_RXH(ieee80211_rx_h_mgmt)
1792
1793 #undef CALL_RXH
1794
1795  rxh_done:
1796         switch (res) {
1797         case RX_DROP_MONITOR:
1798                 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1799                 if (rx->sta)
1800                         rx->sta->rx_dropped++;
1801                 /* fall through */
1802         case RX_CONTINUE:
1803                 ieee80211_rx_cooked_monitor(rx);
1804                 break;
1805         case RX_DROP_UNUSABLE:
1806                 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1807                 if (rx->sta)
1808                         rx->sta->rx_dropped++;
1809                 dev_kfree_skb(rx->skb);
1810                 break;
1811         case RX_QUEUED:
1812                 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1813                 break;
1814         }
1815 }
1816
1817 /* main receive path */
1818
1819 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1820                                 u8 *bssid, struct ieee80211_rx_data *rx,
1821                                 struct ieee80211_hdr *hdr)
1822 {
1823         int multicast = is_multicast_ether_addr(hdr->addr1);
1824
1825         switch (sdata->vif.type) {
1826         case NL80211_IFTYPE_STATION:
1827                 if (!bssid)
1828                         return 0;
1829                 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1830                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1831                                 return 0;
1832                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1833                 } else if (!multicast &&
1834                            compare_ether_addr(sdata->dev->dev_addr,
1835                                               hdr->addr1) != 0) {
1836                         if (!(sdata->dev->flags & IFF_PROMISC))
1837                                 return 0;
1838                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1839                 }
1840                 break;
1841         case NL80211_IFTYPE_ADHOC:
1842                 if (!bssid)
1843                         return 0;
1844                 if (ieee80211_is_beacon(hdr->frame_control)) {
1845                         return 1;
1846                 }
1847                 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1848                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1849                                 return 0;
1850                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1851                 } else if (!multicast &&
1852                            compare_ether_addr(sdata->dev->dev_addr,
1853                                               hdr->addr1) != 0) {
1854                         if (!(sdata->dev->flags & IFF_PROMISC))
1855                                 return 0;
1856                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1857                 } else if (!rx->sta)
1858                         rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
1859                                                 bssid, hdr->addr2,
1860                                                 BIT(rx->status->rate_idx));
1861                 break;
1862         case NL80211_IFTYPE_MESH_POINT:
1863                 if (!multicast &&
1864                     compare_ether_addr(sdata->dev->dev_addr,
1865                                        hdr->addr1) != 0) {
1866                         if (!(sdata->dev->flags & IFF_PROMISC))
1867                                 return 0;
1868
1869                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1870                 }
1871                 break;
1872         case NL80211_IFTYPE_AP_VLAN:
1873         case NL80211_IFTYPE_AP:
1874                 if (!bssid) {
1875                         if (compare_ether_addr(sdata->dev->dev_addr,
1876                                                hdr->addr1))
1877                                 return 0;
1878                 } else if (!ieee80211_bssid_match(bssid,
1879                                         sdata->dev->dev_addr)) {
1880                         if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1881                                 return 0;
1882                         rx->flags &= ~IEEE80211_RX_RA_MATCH;
1883                 }
1884                 break;
1885         case NL80211_IFTYPE_WDS:
1886                 if (bssid || !ieee80211_is_data(hdr->frame_control))
1887                         return 0;
1888                 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1889                         return 0;
1890                 break;
1891         case NL80211_IFTYPE_MONITOR:
1892                 /* take everything */
1893                 break;
1894         case NL80211_IFTYPE_UNSPECIFIED:
1895         case __NL80211_IFTYPE_AFTER_LAST:
1896                 /* should never get here */
1897                 WARN_ON(1);
1898                 break;
1899         }
1900
1901         return 1;
1902 }
1903
1904 /*
1905  * This is the actual Rx frames handler. as it blongs to Rx path it must
1906  * be called with rcu_read_lock protection.
1907  */
1908 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1909                                          struct sk_buff *skb,
1910                                          struct ieee80211_rx_status *status,
1911                                          struct ieee80211_rate *rate)
1912 {
1913         struct ieee80211_local *local = hw_to_local(hw);
1914         struct ieee80211_sub_if_data *sdata;
1915         struct ieee80211_hdr *hdr;
1916         struct ieee80211_rx_data rx;
1917         int prepares;
1918         struct ieee80211_sub_if_data *prev = NULL;
1919         struct sk_buff *skb_new;
1920         u8 *bssid;
1921
1922         hdr = (struct ieee80211_hdr *)skb->data;
1923         memset(&rx, 0, sizeof(rx));
1924         rx.skb = skb;
1925         rx.local = local;
1926
1927         rx.status = status;
1928         rx.rate = rate;
1929
1930         if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
1931                 local->dot11ReceivedFragmentCount++;
1932
1933         rx.sta = sta_info_get(local, hdr->addr2);
1934         if (rx.sta) {
1935                 rx.sdata = rx.sta->sdata;
1936                 rx.dev = rx.sta->sdata->dev;
1937         }
1938
1939         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1940                 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1941                 return;
1942         }
1943
1944         if (unlikely(local->sw_scanning || local->hw_scanning))
1945                 rx.flags |= IEEE80211_RX_IN_SCAN;
1946
1947         ieee80211_parse_qos(&rx);
1948         ieee80211_verify_ip_alignment(&rx);
1949
1950         skb = rx.skb;
1951
1952         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1953                 if (!netif_running(sdata->dev))
1954                         continue;
1955
1956                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1957                         continue;
1958
1959                 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1960                 rx.flags |= IEEE80211_RX_RA_MATCH;
1961                 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1962
1963                 if (!prepares)
1964                         continue;
1965
1966                 /*
1967                  * frame is destined for this interface, but if it's not
1968                  * also for the previous one we handle that after the
1969                  * loop to avoid copying the SKB once too much
1970                  */
1971
1972                 if (!prev) {
1973                         prev = sdata;
1974                         continue;
1975                 }
1976
1977                 /*
1978                  * frame was destined for the previous interface
1979                  * so invoke RX handlers for it
1980                  */
1981
1982                 skb_new = skb_copy(skb, GFP_ATOMIC);
1983                 if (!skb_new) {
1984                         if (net_ratelimit())
1985                                 printk(KERN_DEBUG "%s: failed to copy "
1986                                        "multicast frame for %s\n",
1987                                        wiphy_name(local->hw.wiphy),
1988                                        prev->dev->name);
1989                         continue;
1990                 }
1991                 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1992                 prev = sdata;
1993         }
1994         if (prev)
1995                 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1996         else
1997                 dev_kfree_skb(skb);
1998 }
1999
2000 #define SEQ_MODULO 0x1000
2001 #define SEQ_MASK   0xfff
2002
2003 static inline int seq_less(u16 sq1, u16 sq2)
2004 {
2005         return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
2006 }
2007
2008 static inline u16 seq_inc(u16 sq)
2009 {
2010         return ((sq + 1) & SEQ_MASK);
2011 }
2012
2013 static inline u16 seq_sub(u16 sq1, u16 sq2)
2014 {
2015         return ((sq1 - sq2) & SEQ_MASK);
2016 }
2017
2018
2019 /*
2020  * As it function blongs to Rx path it must be called with
2021  * the proper rcu_read_lock protection for its flow.
2022  */
2023 u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2024                                 struct tid_ampdu_rx *tid_agg_rx,
2025                                 struct sk_buff *skb, u16 mpdu_seq_num,
2026                                 int bar_req)
2027 {
2028         struct ieee80211_local *local = hw_to_local(hw);
2029         struct ieee80211_rx_status status;
2030         u16 head_seq_num, buf_size;
2031         int index;
2032         struct ieee80211_supported_band *sband;
2033         struct ieee80211_rate *rate;
2034
2035         buf_size = tid_agg_rx->buf_size;
2036         head_seq_num = tid_agg_rx->head_seq_num;
2037
2038         /* frame with out of date sequence number */
2039         if (seq_less(mpdu_seq_num, head_seq_num)) {
2040                 dev_kfree_skb(skb);
2041                 return 1;
2042         }
2043
2044         /* if frame sequence number exceeds our buffering window size or
2045          * block Ack Request arrived - release stored frames */
2046         if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2047                 /* new head to the ordering buffer */
2048                 if (bar_req)
2049                         head_seq_num = mpdu_seq_num;
2050                 else
2051                         head_seq_num =
2052                                 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2053                 /* release stored frames up to new head to stack */
2054                 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2055                         index = seq_sub(tid_agg_rx->head_seq_num,
2056                                 tid_agg_rx->ssn)
2057                                 % tid_agg_rx->buf_size;
2058
2059                         if (tid_agg_rx->reorder_buf[index]) {
2060                                 /* release the reordered frames to stack */
2061                                 memcpy(&status,
2062                                         tid_agg_rx->reorder_buf[index]->cb,
2063                                         sizeof(status));
2064                                 sband = local->hw.wiphy->bands[status.band];
2065                                 rate = &sband->bitrates[status.rate_idx];
2066                                 __ieee80211_rx_handle_packet(hw,
2067                                         tid_agg_rx->reorder_buf[index],
2068                                         &status, rate);
2069                                 tid_agg_rx->stored_mpdu_num--;
2070                                 tid_agg_rx->reorder_buf[index] = NULL;
2071                         }
2072                         tid_agg_rx->head_seq_num =
2073                                 seq_inc(tid_agg_rx->head_seq_num);
2074                 }
2075                 if (bar_req)
2076                         return 1;
2077         }
2078
2079         /* now the new frame is always in the range of the reordering */
2080         /* buffer window */
2081         index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2082                                 % tid_agg_rx->buf_size;
2083         /* check if we already stored this frame */
2084         if (tid_agg_rx->reorder_buf[index]) {
2085                 dev_kfree_skb(skb);
2086                 return 1;
2087         }
2088
2089         /* if arrived mpdu is in the right order and nothing else stored */
2090         /* release it immediately */
2091         if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2092                         tid_agg_rx->stored_mpdu_num == 0) {
2093                 tid_agg_rx->head_seq_num =
2094                         seq_inc(tid_agg_rx->head_seq_num);
2095                 return 0;
2096         }
2097
2098         /* put the frame in the reordering buffer */
2099         tid_agg_rx->reorder_buf[index] = skb;
2100         tid_agg_rx->stored_mpdu_num++;
2101         /* release the buffer until next missing frame */
2102         index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2103                                                 % tid_agg_rx->buf_size;
2104         while (tid_agg_rx->reorder_buf[index]) {
2105                 /* release the reordered frame back to stack */
2106                 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2107                         sizeof(status));
2108                 sband = local->hw.wiphy->bands[status.band];
2109                 rate = &sband->bitrates[status.rate_idx];
2110                 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2111                                              &status, rate);
2112                 tid_agg_rx->stored_mpdu_num--;
2113                 tid_agg_rx->reorder_buf[index] = NULL;
2114                 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2115                 index = seq_sub(tid_agg_rx->head_seq_num,
2116                         tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2117         }
2118         return 1;
2119 }
2120
2121 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2122                                      struct sk_buff *skb)
2123 {
2124         struct ieee80211_hw *hw = &local->hw;
2125         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2126         struct sta_info *sta;
2127         struct tid_ampdu_rx *tid_agg_rx;
2128         u16 sc;
2129         u16 mpdu_seq_num;
2130         u8 ret = 0;
2131         int tid;
2132
2133         sta = sta_info_get(local, hdr->addr2);
2134         if (!sta)
2135                 return ret;
2136
2137         /* filter the QoS data rx stream according to
2138          * STA/TID and check if this STA/TID is on aggregation */
2139         if (!ieee80211_is_data_qos(hdr->frame_control))
2140                 goto end_reorder;
2141
2142         tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2143
2144         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2145                 goto end_reorder;
2146
2147         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2148
2149         /* qos null data frames are excluded */
2150         if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2151                 goto end_reorder;
2152
2153         /* new un-ordered ampdu frame - process it */
2154
2155         /* reset session timer */
2156         if (tid_agg_rx->timeout) {
2157                 unsigned long expires =
2158                         jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2159                 mod_timer(&tid_agg_rx->session_timer, expires);
2160         }
2161
2162         /* if this mpdu is fragmented - terminate rx aggregation session */
2163         sc = le16_to_cpu(hdr->seq_ctrl);
2164         if (sc & IEEE80211_SCTL_FRAG) {
2165                 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2166                         tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2167                 ret = 1;
2168                 goto end_reorder;
2169         }
2170
2171         /* according to mpdu sequence number deal with reordering buffer */
2172         mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2173         ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2174                                                 mpdu_seq_num, 0);
2175  end_reorder:
2176         return ret;
2177 }
2178
2179 /*
2180  * This is the receive path handler. It is called by a low level driver when an
2181  * 802.11 MPDU is received from the hardware.
2182  */
2183 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2184                     struct ieee80211_rx_status *status)
2185 {
2186         struct ieee80211_local *local = hw_to_local(hw);
2187         struct ieee80211_rate *rate = NULL;
2188         struct ieee80211_supported_band *sband;
2189
2190         if (status->band < 0 ||
2191             status->band >= IEEE80211_NUM_BANDS) {
2192                 WARN_ON(1);
2193                 return;
2194         }
2195
2196         sband = local->hw.wiphy->bands[status->band];
2197
2198         if (!sband ||
2199             status->rate_idx < 0 ||
2200             status->rate_idx >= sband->n_bitrates) {
2201                 WARN_ON(1);
2202                 return;
2203         }
2204
2205         rate = &sband->bitrates[status->rate_idx];
2206
2207         /*
2208          * key references and virtual interfaces are protected using RCU
2209          * and this requires that we are in a read-side RCU section during
2210          * receive processing
2211          */
2212         rcu_read_lock();
2213
2214         /*
2215          * Frames with failed FCS/PLCP checksum are not returned,
2216          * all other frames are returned without radiotap header
2217          * if it was previously present.
2218          * Also, frames with less than 16 bytes are dropped.
2219          */
2220         skb = ieee80211_rx_monitor(local, skb, status, rate);
2221         if (!skb) {
2222                 rcu_read_unlock();
2223                 return;
2224         }
2225
2226         if (!ieee80211_rx_reorder_ampdu(local, skb))
2227                 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2228
2229         rcu_read_unlock();
2230 }
2231 EXPORT_SYMBOL(__ieee80211_rx);
2232
2233 /* This is a version of the rx handler that can be called from hard irq
2234  * context. Post the skb on the queue and schedule the tasklet */
2235 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2236                           struct ieee80211_rx_status *status)
2237 {
2238         struct ieee80211_local *local = hw_to_local(hw);
2239
2240         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2241
2242         skb->dev = local->mdev;
2243         /* copy status into skb->cb for use by tasklet */
2244         memcpy(skb->cb, status, sizeof(*status));
2245         skb->pkt_type = IEEE80211_RX_MSG;
2246         skb_queue_tail(&local->skb_queue, skb);
2247         tasklet_schedule(&local->tasklet);
2248 }
2249 EXPORT_SYMBOL(ieee80211_rx_irqsafe);