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mac80211: minor code cleanups
[mirror_ubuntu-kernels.git] / net / mac80211 / rx.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 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 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb,
32 u16 mpdu_seq_num,
33 int bar_req);
34 /*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41 struct sk_buff *skb,
42 int rtap_len)
43 {
44 skb_pull(skb, rtap_len);
45
46 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
47 if (likely(skb->len > FCS_LEN))
48 skb_trim(skb, skb->len - FCS_LEN);
49 else {
50 /* driver bug */
51 WARN_ON(1);
52 dev_kfree_skb(skb);
53 skb = NULL;
54 }
55 }
56
57 return skb;
58 }
59
60 static inline int should_drop_frame(struct ieee80211_rx_status *status,
61 struct sk_buff *skb,
62 int present_fcs_len,
63 int radiotap_len)
64 {
65 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
66
67 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
68 return 1;
69 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
70 return 1;
71 if (ieee80211_is_ctl(hdr->frame_control) &&
72 !ieee80211_is_pspoll(hdr->frame_control) &&
73 !ieee80211_is_back_req(hdr->frame_control))
74 return 1;
75 return 0;
76 }
77
78 static int
79 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
80 struct ieee80211_rx_status *status)
81 {
82 int len;
83
84 /* always present fields */
85 len = sizeof(struct ieee80211_radiotap_header) + 9;
86
87 if (status->flag & RX_FLAG_TSFT)
88 len += 8;
89 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
90 local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
91 len += 1;
92 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
93 len += 1;
94
95 if (len & 1) /* padding for RX_FLAGS if necessary */
96 len++;
97
98 /* make sure radiotap starts at a naturally aligned address */
99 if (len % 8)
100 len = roundup(len, 8);
101
102 return len;
103 }
104
105 /**
106 * ieee80211_add_rx_radiotap_header - add radiotap header
107 *
108 * add a radiotap header containing all the fields which the hardware provided.
109 */
110 static void
111 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct sk_buff *skb,
113 struct ieee80211_rx_status *status,
114 struct ieee80211_rate *rate,
115 int rtap_len)
116 {
117 struct ieee80211_radiotap_header *rthdr;
118 unsigned char *pos;
119
120 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
121 memset(rthdr, 0, rtap_len);
122
123 /* radiotap header, set always present flags */
124 rthdr->it_present =
125 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
126 (1 << IEEE80211_RADIOTAP_RATE) |
127 (1 << IEEE80211_RADIOTAP_CHANNEL) |
128 (1 << IEEE80211_RADIOTAP_ANTENNA) |
129 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
130 rthdr->it_len = cpu_to_le16(rtap_len);
131
132 pos = (unsigned char *)(rthdr+1);
133
134 /* the order of the following fields is important */
135
136 /* IEEE80211_RADIOTAP_TSFT */
137 if (status->flag & RX_FLAG_TSFT) {
138 *(__le64 *)pos = cpu_to_le64(status->mactime);
139 rthdr->it_present |=
140 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
141 pos += 8;
142 }
143
144 /* IEEE80211_RADIOTAP_FLAGS */
145 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
146 *pos |= IEEE80211_RADIOTAP_F_FCS;
147 if (status->flag & RX_FLAG_SHORTPRE)
148 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
149 pos++;
150
151 /* IEEE80211_RADIOTAP_RATE */
152 *pos = rate->bitrate / 5;
153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
156 *(__le16 *)pos = cpu_to_le16(status->freq);
157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
159 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
160 IEEE80211_CHAN_5GHZ);
161 else if (rate->flags & IEEE80211_RATE_ERP_G)
162 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
163 IEEE80211_CHAN_2GHZ);
164 else
165 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
166 IEEE80211_CHAN_2GHZ);
167 pos += 2;
168
169 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
170 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
171 *pos = status->signal;
172 rthdr->it_present |=
173 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
174 pos++;
175 }
176
177 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
178 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
179 *pos = status->noise;
180 rthdr->it_present |=
181 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
182 pos++;
183 }
184
185 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
186
187 /* IEEE80211_RADIOTAP_ANTENNA */
188 *pos = status->antenna;
189 pos++;
190
191 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
192 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
193 *pos = status->signal;
194 rthdr->it_present |=
195 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
196 pos++;
197 }
198
199 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
200
201 /* IEEE80211_RADIOTAP_RX_FLAGS */
202 /* ensure 2 byte alignment for the 2 byte field as required */
203 if ((pos - (unsigned char *)rthdr) & 1)
204 pos++;
205 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
206 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
207 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
208 pos += 2;
209 }
210
211 /*
212 * This function copies a received frame to all monitor interfaces and
213 * returns a cleaned-up SKB that no longer includes the FCS nor the
214 * radiotap header the driver might have added.
215 */
216 static struct sk_buff *
217 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
218 struct ieee80211_rx_status *status,
219 struct ieee80211_rate *rate)
220 {
221 struct ieee80211_sub_if_data *sdata;
222 int needed_headroom = 0;
223 struct sk_buff *skb, *skb2;
224 struct net_device *prev_dev = NULL;
225 int present_fcs_len = 0;
226 int rtap_len = 0;
227
228 /*
229 * First, we may need to make a copy of the skb because
230 * (1) we need to modify it for radiotap (if not present), and
231 * (2) the other RX handlers will modify the skb we got.
232 *
233 * We don't need to, of course, if we aren't going to return
234 * the SKB because it has a bad FCS/PLCP checksum.
235 */
236 if (status->flag & RX_FLAG_RADIOTAP)
237 rtap_len = ieee80211_get_radiotap_len(origskb->data);
238 else
239 /* room for the radiotap header based on driver features */
240 needed_headroom = ieee80211_rx_radiotap_len(local, status);
241
242 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
243 present_fcs_len = FCS_LEN;
244
245 if (!local->monitors) {
246 if (should_drop_frame(status, origskb, present_fcs_len,
247 rtap_len)) {
248 dev_kfree_skb(origskb);
249 return NULL;
250 }
251
252 return remove_monitor_info(local, origskb, rtap_len);
253 }
254
255 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
256 /* only need to expand headroom if necessary */
257 skb = origskb;
258 origskb = NULL;
259
260 /*
261 * This shouldn't trigger often because most devices have an
262 * RX header they pull before we get here, and that should
263 * be big enough for our radiotap information. We should
264 * probably export the length to drivers so that we can have
265 * them allocate enough headroom to start with.
266 */
267 if (skb_headroom(skb) < needed_headroom &&
268 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
269 dev_kfree_skb(skb);
270 return NULL;
271 }
272 } else {
273 /*
274 * Need to make a copy and possibly remove radiotap header
275 * and FCS from the original.
276 */
277 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
278
279 origskb = remove_monitor_info(local, origskb, rtap_len);
280
281 if (!skb)
282 return origskb;
283 }
284
285 /* if necessary, prepend radiotap information */
286 if (!(status->flag & RX_FLAG_RADIOTAP))
287 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
288 needed_headroom);
289
290 skb_reset_mac_header(skb);
291 skb->ip_summed = CHECKSUM_UNNECESSARY;
292 skb->pkt_type = PACKET_OTHERHOST;
293 skb->protocol = htons(ETH_P_802_2);
294
295 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
296 if (!netif_running(sdata->dev))
297 continue;
298
299 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
300 continue;
301
302 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
303 continue;
304
305 if (prev_dev) {
306 skb2 = skb_clone(skb, GFP_ATOMIC);
307 if (skb2) {
308 skb2->dev = prev_dev;
309 netif_rx(skb2);
310 }
311 }
312
313 prev_dev = sdata->dev;
314 sdata->dev->stats.rx_packets++;
315 sdata->dev->stats.rx_bytes += skb->len;
316 }
317
318 if (prev_dev) {
319 skb->dev = prev_dev;
320 netif_rx(skb);
321 } else
322 dev_kfree_skb(skb);
323
324 return origskb;
325 }
326
327
328 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
329 {
330 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
331 int tid;
332
333 /* does the frame have a qos control field? */
334 if (ieee80211_is_data_qos(hdr->frame_control)) {
335 u8 *qc = ieee80211_get_qos_ctl(hdr);
336 /* frame has qos control */
337 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
338 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
339 rx->flags |= IEEE80211_RX_AMSDU;
340 else
341 rx->flags &= ~IEEE80211_RX_AMSDU;
342 } else {
343 /*
344 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
345 *
346 * Sequence numbers for management frames, QoS data
347 * frames with a broadcast/multicast address in the
348 * Address 1 field, and all non-QoS data frames sent
349 * by QoS STAs are assigned using an additional single
350 * modulo-4096 counter, [...]
351 *
352 * We also use that counter for non-QoS STAs.
353 */
354 tid = NUM_RX_DATA_QUEUES - 1;
355 }
356
357 rx->queue = tid;
358 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
359 * For now, set skb->priority to 0 for other cases. */
360 rx->skb->priority = (tid > 7) ? 0 : tid;
361 }
362
363 static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
364 {
365 #ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
367 int hdrlen;
368
369 if (!ieee80211_is_data_present(hdr->frame_control))
370 return;
371
372 /*
373 * Drivers are required to align the payload data in a way that
374 * guarantees that the contained IP header is aligned to a four-
375 * byte boundary. In the case of regular frames, this simply means
376 * aligning the payload to a four-byte boundary (because either
377 * the IP header is directly contained, or IV/RFC1042 headers that
378 * have a length divisible by four are in front of it.
379 *
380 * With A-MSDU frames, however, the payload data address must
381 * yield two modulo four because there are 14-byte 802.3 headers
382 * within the A-MSDU frames that push the IP header further back
383 * to a multiple of four again. Thankfully, the specs were sane
384 * enough this time around to require padding each A-MSDU subframe
385 * to a length that is a multiple of four.
386 *
387 * Padding like atheros hardware adds which is inbetween the 802.11
388 * header and the payload is not supported, the driver is required
389 * to move the 802.11 header further back in that case.
390 */
391 hdrlen = ieee80211_hdrlen(hdr->frame_control);
392 if (rx->flags & IEEE80211_RX_AMSDU)
393 hdrlen += ETH_HLEN;
394 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
395 #endif
396 }
397
398
399 /* rx handlers */
400
401 static ieee80211_rx_result debug_noinline
402 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
403 {
404 struct ieee80211_local *local = rx->local;
405 struct sk_buff *skb = rx->skb;
406
407 if (unlikely(local->hw_scanning))
408 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
409
410 if (unlikely(local->sw_scanning)) {
411 /* drop all the other packets during a software scan anyway */
412 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
413 != RX_QUEUED)
414 dev_kfree_skb(skb);
415 return RX_QUEUED;
416 }
417
418 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
419 /* scanning finished during invoking of handlers */
420 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
421 return RX_DROP_UNUSABLE;
422 }
423
424 return RX_CONTINUE;
425 }
426
427 static ieee80211_rx_result
428 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
429 {
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
431 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
432
433 if (ieee80211_is_data(hdr->frame_control)) {
434 if (!ieee80211_has_a4(hdr->frame_control))
435 return RX_DROP_MONITOR;
436 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
437 return RX_DROP_MONITOR;
438 }
439
440 /* If there is not an established peer link and this is not a peer link
441 * establisment frame, beacon or probe, drop the frame.
442 */
443
444 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
445 struct ieee80211_mgmt *mgmt;
446
447 if (!ieee80211_is_mgmt(hdr->frame_control))
448 return RX_DROP_MONITOR;
449
450 if (ieee80211_is_action(hdr->frame_control)) {
451 mgmt = (struct ieee80211_mgmt *)hdr;
452 if (mgmt->u.action.category != PLINK_CATEGORY)
453 return RX_DROP_MONITOR;
454 return RX_CONTINUE;
455 }
456
457 if (ieee80211_is_probe_req(hdr->frame_control) ||
458 ieee80211_is_probe_resp(hdr->frame_control) ||
459 ieee80211_is_beacon(hdr->frame_control))
460 return RX_CONTINUE;
461
462 return RX_DROP_MONITOR;
463
464 }
465
466 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
467
468 if (ieee80211_is_data(hdr->frame_control) &&
469 is_multicast_ether_addr(hdr->addr1) &&
470 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
471 return RX_DROP_MONITOR;
472 #undef msh_h_get
473
474 return RX_CONTINUE;
475 }
476
477
478 static ieee80211_rx_result debug_noinline
479 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
480 {
481 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
482
483 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
484 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
485 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
486 rx->sta->last_seq_ctrl[rx->queue] ==
487 hdr->seq_ctrl)) {
488 if (rx->flags & IEEE80211_RX_RA_MATCH) {
489 rx->local->dot11FrameDuplicateCount++;
490 rx->sta->num_duplicates++;
491 }
492 return RX_DROP_MONITOR;
493 } else
494 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
495 }
496
497 if (unlikely(rx->skb->len < 16)) {
498 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
499 return RX_DROP_MONITOR;
500 }
501
502 /* Drop disallowed frame classes based on STA auth/assoc state;
503 * IEEE 802.11, Chap 5.5.
504 *
505 * mac80211 filters only based on association state, i.e. it drops
506 * Class 3 frames from not associated stations. hostapd sends
507 * deauth/disassoc frames when needed. In addition, hostapd is
508 * responsible for filtering on both auth and assoc states.
509 */
510
511 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
512 return ieee80211_rx_mesh_check(rx);
513
514 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
515 ieee80211_is_pspoll(hdr->frame_control)) &&
516 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
517 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
518 if ((!ieee80211_has_fromds(hdr->frame_control) &&
519 !ieee80211_has_tods(hdr->frame_control) &&
520 ieee80211_is_data(hdr->frame_control)) ||
521 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
522 /* Drop IBSS frames and frames for other hosts
523 * silently. */
524 return RX_DROP_MONITOR;
525 }
526
527 return RX_DROP_MONITOR;
528 }
529
530 return RX_CONTINUE;
531 }
532
533
534 static ieee80211_rx_result debug_noinline
535 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
536 {
537 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
538 int keyidx;
539 int hdrlen;
540 ieee80211_rx_result result = RX_DROP_UNUSABLE;
541 struct ieee80211_key *stakey = NULL;
542
543 /*
544 * Key selection 101
545 *
546 * There are three types of keys:
547 * - GTK (group keys)
548 * - PTK (pairwise keys)
549 * - STK (station-to-station pairwise keys)
550 *
551 * When selecting a key, we have to distinguish between multicast
552 * (including broadcast) and unicast frames, the latter can only
553 * use PTKs and STKs while the former always use GTKs. Unless, of
554 * course, actual WEP keys ("pre-RSNA") are used, then unicast
555 * frames can also use key indizes like GTKs. Hence, if we don't
556 * have a PTK/STK we check the key index for a WEP key.
557 *
558 * Note that in a regular BSS, multicast frames are sent by the
559 * AP only, associated stations unicast the frame to the AP first
560 * which then multicasts it on their behalf.
561 *
562 * There is also a slight problem in IBSS mode: GTKs are negotiated
563 * with each station, that is something we don't currently handle.
564 * The spec seems to expect that one negotiates the same key with
565 * every station but there's no such requirement; VLANs could be
566 * possible.
567 */
568
569 if (!ieee80211_has_protected(hdr->frame_control))
570 return RX_CONTINUE;
571
572 /*
573 * No point in finding a key and decrypting if the frame is neither
574 * addressed to us nor a multicast frame.
575 */
576 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
577 return RX_CONTINUE;
578
579 if (rx->sta)
580 stakey = rcu_dereference(rx->sta->key);
581
582 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
583 rx->key = stakey;
584 } else {
585 /*
586 * The device doesn't give us the IV so we won't be
587 * able to look up the key. That's ok though, we
588 * don't need to decrypt the frame, we just won't
589 * be able to keep statistics accurate.
590 * Except for key threshold notifications, should
591 * we somehow allow the driver to tell us which key
592 * the hardware used if this flag is set?
593 */
594 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
595 (rx->status->flag & RX_FLAG_IV_STRIPPED))
596 return RX_CONTINUE;
597
598 hdrlen = ieee80211_hdrlen(hdr->frame_control);
599
600 if (rx->skb->len < 8 + hdrlen)
601 return RX_DROP_UNUSABLE; /* TODO: count this? */
602
603 /*
604 * no need to call ieee80211_wep_get_keyidx,
605 * it verifies a bunch of things we've done already
606 */
607 keyidx = rx->skb->data[hdrlen + 3] >> 6;
608
609 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
610
611 /*
612 * RSNA-protected unicast frames should always be sent with
613 * pairwise or station-to-station keys, but for WEP we allow
614 * using a key index as well.
615 */
616 if (rx->key && rx->key->conf.alg != ALG_WEP &&
617 !is_multicast_ether_addr(hdr->addr1))
618 rx->key = NULL;
619 }
620
621 if (rx->key) {
622 rx->key->tx_rx_count++;
623 /* TODO: add threshold stuff again */
624 } else {
625 return RX_DROP_MONITOR;
626 }
627
628 /* Check for weak IVs if possible */
629 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
630 ieee80211_is_data(hdr->frame_control) &&
631 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
632 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
633 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
634 rx->sta->wep_weak_iv_count++;
635
636 switch (rx->key->conf.alg) {
637 case ALG_WEP:
638 result = ieee80211_crypto_wep_decrypt(rx);
639 break;
640 case ALG_TKIP:
641 result = ieee80211_crypto_tkip_decrypt(rx);
642 break;
643 case ALG_CCMP:
644 result = ieee80211_crypto_ccmp_decrypt(rx);
645 break;
646 }
647
648 /* either the frame has been decrypted or will be dropped */
649 rx->status->flag |= RX_FLAG_DECRYPTED;
650
651 return result;
652 }
653
654 static void ap_sta_ps_start(struct sta_info *sta)
655 {
656 struct ieee80211_sub_if_data *sdata = sta->sdata;
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 %pM aid %d enters power save mode\n",
662 sdata->dev->name, 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
674 atomic_dec(&sdata->bss->num_sta_ps);
675
676 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
677
678 if (!skb_queue_empty(&sta->ps_tx_buf))
679 sta_info_clear_tim_bit(sta);
680
681 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
682 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
683 sdata->dev->name, sta->sta.addr, sta->sta.aid);
684 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
685
686 /* Send all buffered frames to the station */
687 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
688 info = IEEE80211_SKB_CB(skb);
689 sent++;
690 info->flags |= IEEE80211_TX_CTL_REQUEUE;
691 dev_queue_xmit(skb);
692 }
693 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
694 info = IEEE80211_SKB_CB(skb);
695 local->total_ps_buffered--;
696 sent++;
697 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
698 printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame "
699 "since STA not sleeping anymore\n", sdata->dev->name,
700 sta->sta.addr, sta->sta.aid);
701 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
702 info->flags |= IEEE80211_TX_CTL_REQUEUE;
703 dev_queue_xmit(skb);
704 }
705
706 return sent;
707 }
708
709 static ieee80211_rx_result debug_noinline
710 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
711 {
712 struct sta_info *sta = rx->sta;
713 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
714
715 if (!sta)
716 return RX_CONTINUE;
717
718 /* Update last_rx only for IBSS packets which are for the current
719 * BSSID to avoid keeping the current IBSS network alive in cases where
720 * other STAs are using different BSSID. */
721 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
722 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
723 NL80211_IFTYPE_ADHOC);
724 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
725 sta->last_rx = jiffies;
726 } else
727 if (!is_multicast_ether_addr(hdr->addr1) ||
728 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
729 /* Update last_rx only for unicast frames in order to prevent
730 * the Probe Request frames (the only broadcast frames from a
731 * STA in infrastructure mode) from keeping a connection alive.
732 * Mesh beacons will update last_rx when if they are found to
733 * match the current local configuration when processed.
734 */
735 sta->last_rx = jiffies;
736 }
737
738 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
739 return RX_CONTINUE;
740
741 sta->rx_fragments++;
742 sta->rx_bytes += rx->skb->len;
743 sta->last_signal = rx->status->signal;
744 sta->last_qual = rx->status->qual;
745 sta->last_noise = rx->status->noise;
746
747 if (!ieee80211_has_morefrags(hdr->frame_control) &&
748 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
749 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
750 /* Change STA power saving mode only in the end of a frame
751 * exchange sequence */
752 if (test_sta_flags(sta, WLAN_STA_PS) &&
753 !ieee80211_has_pm(hdr->frame_control))
754 rx->sent_ps_buffered += ap_sta_ps_end(sta);
755 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
756 ieee80211_has_pm(hdr->frame_control))
757 ap_sta_ps_start(sta);
758 }
759
760 /* Drop data::nullfunc frames silently, since they are used only to
761 * control station power saving mode. */
762 if (ieee80211_is_nullfunc(hdr->frame_control)) {
763 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
764 /* Update counter and free packet here to avoid counting this
765 * as a dropped packed. */
766 sta->rx_packets++;
767 dev_kfree_skb(rx->skb);
768 return RX_QUEUED;
769 }
770
771 return RX_CONTINUE;
772 } /* ieee80211_rx_h_sta_process */
773
774 static inline struct ieee80211_fragment_entry *
775 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
776 unsigned int frag, unsigned int seq, int rx_queue,
777 struct sk_buff **skb)
778 {
779 struct ieee80211_fragment_entry *entry;
780 int idx;
781
782 idx = sdata->fragment_next;
783 entry = &sdata->fragments[sdata->fragment_next++];
784 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
785 sdata->fragment_next = 0;
786
787 if (!skb_queue_empty(&entry->skb_list)) {
788 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
789 struct ieee80211_hdr *hdr =
790 (struct ieee80211_hdr *) entry->skb_list.next->data;
791 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
792 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
793 "addr1=%pM addr2=%pM\n",
794 sdata->dev->name, idx,
795 jiffies - entry->first_frag_time, entry->seq,
796 entry->last_frag, hdr->addr1, hdr->addr2);
797 #endif
798 __skb_queue_purge(&entry->skb_list);
799 }
800
801 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
802 *skb = NULL;
803 entry->first_frag_time = jiffies;
804 entry->seq = seq;
805 entry->rx_queue = rx_queue;
806 entry->last_frag = frag;
807 entry->ccmp = 0;
808 entry->extra_len = 0;
809
810 return entry;
811 }
812
813 static inline struct ieee80211_fragment_entry *
814 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
815 unsigned int frag, unsigned int seq,
816 int rx_queue, struct ieee80211_hdr *hdr)
817 {
818 struct ieee80211_fragment_entry *entry;
819 int i, idx;
820
821 idx = sdata->fragment_next;
822 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
823 struct ieee80211_hdr *f_hdr;
824
825 idx--;
826 if (idx < 0)
827 idx = IEEE80211_FRAGMENT_MAX - 1;
828
829 entry = &sdata->fragments[idx];
830 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
831 entry->rx_queue != rx_queue ||
832 entry->last_frag + 1 != frag)
833 continue;
834
835 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
836
837 /*
838 * Check ftype and addresses are equal, else check next fragment
839 */
840 if (((hdr->frame_control ^ f_hdr->frame_control) &
841 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
842 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
843 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
844 continue;
845
846 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
847 __skb_queue_purge(&entry->skb_list);
848 continue;
849 }
850 return entry;
851 }
852
853 return NULL;
854 }
855
856 static ieee80211_rx_result debug_noinline
857 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
858 {
859 struct ieee80211_hdr *hdr;
860 u16 sc;
861 __le16 fc;
862 unsigned int frag, seq;
863 struct ieee80211_fragment_entry *entry;
864 struct sk_buff *skb;
865
866 hdr = (struct ieee80211_hdr *)rx->skb->data;
867 fc = hdr->frame_control;
868 sc = le16_to_cpu(hdr->seq_ctrl);
869 frag = sc & IEEE80211_SCTL_FRAG;
870
871 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
872 (rx->skb)->len < 24 ||
873 is_multicast_ether_addr(hdr->addr1))) {
874 /* not fragmented */
875 goto out;
876 }
877 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
878
879 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
880
881 if (frag == 0) {
882 /* This is the first fragment of a new frame. */
883 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
884 rx->queue, &(rx->skb));
885 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
886 ieee80211_has_protected(fc)) {
887 /* Store CCMP PN so that we can verify that the next
888 * fragment has a sequential PN value. */
889 entry->ccmp = 1;
890 memcpy(entry->last_pn,
891 rx->key->u.ccmp.rx_pn[rx->queue],
892 CCMP_PN_LEN);
893 }
894 return RX_QUEUED;
895 }
896
897 /* This is a fragment for a frame that should already be pending in
898 * fragment cache. Add this fragment to the end of the pending entry.
899 */
900 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
901 if (!entry) {
902 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
903 return RX_DROP_MONITOR;
904 }
905
906 /* Verify that MPDUs within one MSDU have sequential PN values.
907 * (IEEE 802.11i, 8.3.3.4.5) */
908 if (entry->ccmp) {
909 int i;
910 u8 pn[CCMP_PN_LEN], *rpn;
911 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
912 return RX_DROP_UNUSABLE;
913 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
914 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
915 pn[i]++;
916 if (pn[i])
917 break;
918 }
919 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
920 if (memcmp(pn, rpn, CCMP_PN_LEN))
921 return RX_DROP_UNUSABLE;
922 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
923 }
924
925 skb_pull(rx->skb, ieee80211_hdrlen(fc));
926 __skb_queue_tail(&entry->skb_list, rx->skb);
927 entry->last_frag = frag;
928 entry->extra_len += rx->skb->len;
929 if (ieee80211_has_morefrags(fc)) {
930 rx->skb = NULL;
931 return RX_QUEUED;
932 }
933
934 rx->skb = __skb_dequeue(&entry->skb_list);
935 if (skb_tailroom(rx->skb) < entry->extra_len) {
936 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
937 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
938 GFP_ATOMIC))) {
939 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
940 __skb_queue_purge(&entry->skb_list);
941 return RX_DROP_UNUSABLE;
942 }
943 }
944 while ((skb = __skb_dequeue(&entry->skb_list))) {
945 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
946 dev_kfree_skb(skb);
947 }
948
949 /* Complete frame has been reassembled - process it now */
950 rx->flags |= IEEE80211_RX_FRAGMENTED;
951
952 out:
953 if (rx->sta)
954 rx->sta->rx_packets++;
955 if (is_multicast_ether_addr(hdr->addr1))
956 rx->local->dot11MulticastReceivedFrameCount++;
957 else
958 ieee80211_led_rx(rx->local);
959 return RX_CONTINUE;
960 }
961
962 static ieee80211_rx_result debug_noinline
963 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
964 {
965 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
966 struct sk_buff *skb;
967 int no_pending_pkts;
968 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
969
970 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
971 !(rx->flags & IEEE80211_RX_RA_MATCH)))
972 return RX_CONTINUE;
973
974 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
975 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
976 return RX_DROP_UNUSABLE;
977
978 skb = skb_dequeue(&rx->sta->tx_filtered);
979 if (!skb) {
980 skb = skb_dequeue(&rx->sta->ps_tx_buf);
981 if (skb)
982 rx->local->total_ps_buffered--;
983 }
984 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
985 skb_queue_empty(&rx->sta->ps_tx_buf);
986
987 if (skb) {
988 struct ieee80211_hdr *hdr =
989 (struct ieee80211_hdr *) skb->data;
990
991 /*
992 * Tell TX path to send one frame even though the STA may
993 * still remain is PS mode after this frame exchange.
994 */
995 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
996
997 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
998 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
999 rx->sta->sta.addr, rx->sta->sta.aid,
1000 skb_queue_len(&rx->sta->ps_tx_buf));
1001 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1002
1003 /* Use MoreData flag to indicate whether there are more
1004 * buffered frames for this STA */
1005 if (no_pending_pkts)
1006 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1007 else
1008 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1009
1010 dev_queue_xmit(skb);
1011
1012 if (no_pending_pkts)
1013 sta_info_clear_tim_bit(rx->sta);
1014 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1015 } else if (!rx->sent_ps_buffered) {
1016 /*
1017 * FIXME: This can be the result of a race condition between
1018 * us expiring a frame and the station polling for it.
1019 * Should we send it a null-func frame indicating we
1020 * have nothing buffered for it?
1021 */
1022 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1023 "though there are no buffered frames for it\n",
1024 rx->dev->name, rx->sta->sta.addr);
1025 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1026 }
1027
1028 /* Free PS Poll skb here instead of returning RX_DROP that would
1029 * count as an dropped frame. */
1030 dev_kfree_skb(rx->skb);
1031
1032 return RX_QUEUED;
1033 }
1034
1035 static ieee80211_rx_result debug_noinline
1036 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1037 {
1038 u8 *data = rx->skb->data;
1039 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1040
1041 if (!ieee80211_is_data_qos(hdr->frame_control))
1042 return RX_CONTINUE;
1043
1044 /* remove the qos control field, update frame type and meta-data */
1045 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1046 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1047 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1048 /* change frame type to non QOS */
1049 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1050
1051 return RX_CONTINUE;
1052 }
1053
1054 static int
1055 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1056 {
1057 if (unlikely(!rx->sta ||
1058 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1059 return -EACCES;
1060
1061 return 0;
1062 }
1063
1064 static int
1065 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1066 {
1067 /*
1068 * Pass through unencrypted frames if the hardware has
1069 * decrypted them already.
1070 */
1071 if (rx->status->flag & RX_FLAG_DECRYPTED)
1072 return 0;
1073
1074 /* Drop unencrypted frames if key is set. */
1075 if (unlikely(!ieee80211_has_protected(fc) &&
1076 !ieee80211_is_nullfunc(fc) &&
1077 (rx->key || rx->sdata->drop_unencrypted)))
1078 return -EACCES;
1079
1080 return 0;
1081 }
1082
1083 static int
1084 ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1085 {
1086 struct net_device *dev = rx->dev;
1087 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
1088 u16 hdrlen, ethertype;
1089 u8 *payload;
1090 u8 dst[ETH_ALEN];
1091 u8 src[ETH_ALEN] __aligned(2);
1092 struct sk_buff *skb = rx->skb;
1093 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1094
1095 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1096 return -1;
1097
1098 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1099
1100 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1101 * header
1102 * IEEE 802.11 address fields:
1103 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1104 * 0 0 DA SA BSSID n/a
1105 * 0 1 DA BSSID SA n/a
1106 * 1 0 BSSID SA DA n/a
1107 * 1 1 RA TA DA SA
1108 */
1109 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1110 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
1111
1112 switch (hdr->frame_control &
1113 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1114 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
1115 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1116 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1117 return -1;
1118 break;
1119 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1120 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1121 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
1122 return -1;
1123 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1124 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1125 (skb->data + hdrlen);
1126 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1127 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1128 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1129 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1130 }
1131 }
1132 break;
1133 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
1134 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1135 (is_multicast_ether_addr(dst) &&
1136 !compare_ether_addr(src, dev->dev_addr)))
1137 return -1;
1138 break;
1139 case __constant_cpu_to_le16(0):
1140 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
1141 return -1;
1142 break;
1143 }
1144
1145 if (unlikely(skb->len - hdrlen < 8))
1146 return -1;
1147
1148 payload = skb->data + hdrlen;
1149 ethertype = (payload[6] << 8) | payload[7];
1150
1151 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1152 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1153 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1154 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1155 * replace EtherType */
1156 skb_pull(skb, hdrlen + 6);
1157 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1158 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1159 } else {
1160 struct ethhdr *ehdr;
1161 __be16 len;
1162
1163 skb_pull(skb, hdrlen);
1164 len = htons(skb->len);
1165 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1166 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1167 memcpy(ehdr->h_source, src, ETH_ALEN);
1168 ehdr->h_proto = len;
1169 }
1170 return 0;
1171 }
1172
1173 /*
1174 * requires that rx->skb is a frame with ethernet header
1175 */
1176 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1177 {
1178 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1179 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1180 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1181
1182 /*
1183 * Allow EAPOL frames to us/the PAE group address regardless
1184 * of whether the frame was encrypted or not.
1185 */
1186 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1187 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1188 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1189 return true;
1190
1191 if (ieee80211_802_1x_port_control(rx) ||
1192 ieee80211_drop_unencrypted(rx, fc))
1193 return false;
1194
1195 return true;
1196 }
1197
1198 /*
1199 * requires that rx->skb is a frame with ethernet header
1200 */
1201 static void
1202 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1203 {
1204 struct net_device *dev = rx->dev;
1205 struct ieee80211_local *local = rx->local;
1206 struct sk_buff *skb, *xmit_skb;
1207 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1208 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1209 struct sta_info *dsta;
1210
1211 skb = rx->skb;
1212 xmit_skb = NULL;
1213
1214 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1215 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1216 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1217 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1218 if (is_multicast_ether_addr(ehdr->h_dest)) {
1219 /*
1220 * send multicast frames both to higher layers in
1221 * local net stack and back to the wireless medium
1222 */
1223 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1224 if (!xmit_skb && net_ratelimit())
1225 printk(KERN_DEBUG "%s: failed to clone "
1226 "multicast frame\n", dev->name);
1227 } else {
1228 dsta = sta_info_get(local, skb->data);
1229 if (dsta && dsta->sdata->dev == dev) {
1230 /*
1231 * The destination station is associated to
1232 * this AP (in this VLAN), so send the frame
1233 * directly to it and do not pass it to local
1234 * net stack.
1235 */
1236 xmit_skb = skb;
1237 skb = NULL;
1238 }
1239 }
1240 }
1241
1242 if (skb) {
1243 /* deliver to local stack */
1244 skb->protocol = eth_type_trans(skb, dev);
1245 memset(skb->cb, 0, sizeof(skb->cb));
1246 netif_rx(skb);
1247 }
1248
1249 if (xmit_skb) {
1250 /* send to wireless media */
1251 xmit_skb->protocol = htons(ETH_P_802_3);
1252 skb_reset_network_header(xmit_skb);
1253 skb_reset_mac_header(xmit_skb);
1254 dev_queue_xmit(xmit_skb);
1255 }
1256 }
1257
1258 static ieee80211_rx_result debug_noinline
1259 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1260 {
1261 struct net_device *dev = rx->dev;
1262 struct ieee80211_local *local = rx->local;
1263 u16 ethertype;
1264 u8 *payload;
1265 struct sk_buff *skb = rx->skb, *frame = NULL;
1266 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1267 __le16 fc = hdr->frame_control;
1268 const struct ethhdr *eth;
1269 int remaining, err;
1270 u8 dst[ETH_ALEN];
1271 u8 src[ETH_ALEN];
1272
1273 if (unlikely(!ieee80211_is_data(fc)))
1274 return RX_CONTINUE;
1275
1276 if (unlikely(!ieee80211_is_data_present(fc)))
1277 return RX_DROP_MONITOR;
1278
1279 if (!(rx->flags & IEEE80211_RX_AMSDU))
1280 return RX_CONTINUE;
1281
1282 err = ieee80211_data_to_8023(rx);
1283 if (unlikely(err))
1284 return RX_DROP_UNUSABLE;
1285
1286 skb->dev = dev;
1287
1288 dev->stats.rx_packets++;
1289 dev->stats.rx_bytes += skb->len;
1290
1291 /* skip the wrapping header */
1292 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1293 if (!eth)
1294 return RX_DROP_UNUSABLE;
1295
1296 while (skb != frame) {
1297 u8 padding;
1298 __be16 len = eth->h_proto;
1299 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1300
1301 remaining = skb->len;
1302 memcpy(dst, eth->h_dest, ETH_ALEN);
1303 memcpy(src, eth->h_source, ETH_ALEN);
1304
1305 padding = ((4 - subframe_len) & 0x3);
1306 /* the last MSDU has no padding */
1307 if (subframe_len > remaining)
1308 return RX_DROP_UNUSABLE;
1309
1310 skb_pull(skb, sizeof(struct ethhdr));
1311 /* if last subframe reuse skb */
1312 if (remaining <= subframe_len + padding)
1313 frame = skb;
1314 else {
1315 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1316 subframe_len);
1317
1318 if (frame == NULL)
1319 return RX_DROP_UNUSABLE;
1320
1321 skb_reserve(frame, local->hw.extra_tx_headroom +
1322 sizeof(struct ethhdr));
1323 memcpy(skb_put(frame, ntohs(len)), skb->data,
1324 ntohs(len));
1325
1326 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1327 padding);
1328 if (!eth) {
1329 dev_kfree_skb(frame);
1330 return RX_DROP_UNUSABLE;
1331 }
1332 }
1333
1334 skb_reset_network_header(frame);
1335 frame->dev = dev;
1336 frame->priority = skb->priority;
1337 rx->skb = frame;
1338
1339 payload = frame->data;
1340 ethertype = (payload[6] << 8) | payload[7];
1341
1342 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1343 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1344 compare_ether_addr(payload,
1345 bridge_tunnel_header) == 0)) {
1346 /* remove RFC1042 or Bridge-Tunnel
1347 * encapsulation and replace EtherType */
1348 skb_pull(frame, 6);
1349 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1350 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1351 } else {
1352 memcpy(skb_push(frame, sizeof(__be16)),
1353 &len, sizeof(__be16));
1354 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1355 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1356 }
1357
1358 if (!ieee80211_frame_allowed(rx, fc)) {
1359 if (skb == frame) /* last frame */
1360 return RX_DROP_UNUSABLE;
1361 dev_kfree_skb(frame);
1362 continue;
1363 }
1364
1365 ieee80211_deliver_skb(rx);
1366 }
1367
1368 return RX_QUEUED;
1369 }
1370
1371 #ifdef CONFIG_MAC80211_MESH
1372 static ieee80211_rx_result
1373 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1374 {
1375 struct ieee80211_hdr *hdr;
1376 struct ieee80211s_hdr *mesh_hdr;
1377 unsigned int hdrlen;
1378 struct sk_buff *skb = rx->skb, *fwd_skb;
1379
1380 hdr = (struct ieee80211_hdr *) skb->data;
1381 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1382 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1383
1384 if (!ieee80211_is_data(hdr->frame_control))
1385 return RX_CONTINUE;
1386
1387 if (!mesh_hdr->ttl)
1388 /* illegal frame */
1389 return RX_DROP_MONITOR;
1390
1391 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1392 struct ieee80211_sub_if_data *sdata;
1393 struct mesh_path *mppath;
1394
1395 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1396 rcu_read_lock();
1397 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1398 if (!mppath) {
1399 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1400 } else {
1401 spin_lock_bh(&mppath->state_lock);
1402 mppath->exp_time = jiffies;
1403 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1404 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1405 spin_unlock_bh(&mppath->state_lock);
1406 }
1407 rcu_read_unlock();
1408 }
1409
1410 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1411 return RX_CONTINUE;
1412
1413 mesh_hdr->ttl--;
1414
1415 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1416 if (!mesh_hdr->ttl)
1417 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1418 dropped_frames_ttl);
1419 else {
1420 struct ieee80211_hdr *fwd_hdr;
1421 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1422
1423 if (!fwd_skb && net_ratelimit())
1424 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1425 rx->dev->name);
1426
1427 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1428 /*
1429 * Save TA to addr1 to send TA a path error if a
1430 * suitable next hop is not found
1431 */
1432 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1433 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1434 fwd_skb->dev = rx->local->mdev;
1435 fwd_skb->iif = rx->dev->ifindex;
1436 dev_queue_xmit(fwd_skb);
1437 }
1438 }
1439
1440 if (is_multicast_ether_addr(hdr->addr3) ||
1441 rx->dev->flags & IFF_PROMISC)
1442 return RX_CONTINUE;
1443 else
1444 return RX_DROP_MONITOR;
1445 }
1446 #endif
1447
1448 static ieee80211_rx_result debug_noinline
1449 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1450 {
1451 struct net_device *dev = rx->dev;
1452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1453 __le16 fc = hdr->frame_control;
1454 int err;
1455
1456 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1457 return RX_CONTINUE;
1458
1459 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1460 return RX_DROP_MONITOR;
1461
1462 err = ieee80211_data_to_8023(rx);
1463 if (unlikely(err))
1464 return RX_DROP_UNUSABLE;
1465
1466 if (!ieee80211_frame_allowed(rx, fc))
1467 return RX_DROP_MONITOR;
1468
1469 rx->skb->dev = dev;
1470
1471 dev->stats.rx_packets++;
1472 dev->stats.rx_bytes += rx->skb->len;
1473
1474 ieee80211_deliver_skb(rx);
1475
1476 return RX_QUEUED;
1477 }
1478
1479 static ieee80211_rx_result debug_noinline
1480 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1481 {
1482 struct ieee80211_local *local = rx->local;
1483 struct ieee80211_hw *hw = &local->hw;
1484 struct sk_buff *skb = rx->skb;
1485 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1486 struct tid_ampdu_rx *tid_agg_rx;
1487 u16 start_seq_num;
1488 u16 tid;
1489
1490 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1491 return RX_CONTINUE;
1492
1493 if (ieee80211_is_back_req(bar->frame_control)) {
1494 if (!rx->sta)
1495 return RX_CONTINUE;
1496 tid = le16_to_cpu(bar->control) >> 12;
1497 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1498 != HT_AGG_STATE_OPERATIONAL)
1499 return RX_CONTINUE;
1500 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1501
1502 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1503
1504 /* reset session timer */
1505 if (tid_agg_rx->timeout) {
1506 unsigned long expires =
1507 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1508 mod_timer(&tid_agg_rx->session_timer, expires);
1509 }
1510
1511 /* manage reordering buffer according to requested */
1512 /* sequence number */
1513 rcu_read_lock();
1514 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1515 start_seq_num, 1);
1516 rcu_read_unlock();
1517 return RX_DROP_UNUSABLE;
1518 }
1519
1520 return RX_CONTINUE;
1521 }
1522
1523 static ieee80211_rx_result debug_noinline
1524 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1525 {
1526 struct ieee80211_local *local = rx->local;
1527 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1528 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1529 int len = rx->skb->len;
1530
1531 if (!ieee80211_is_action(mgmt->frame_control))
1532 return RX_CONTINUE;
1533
1534 if (!rx->sta)
1535 return RX_DROP_MONITOR;
1536
1537 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1538 return RX_DROP_MONITOR;
1539
1540 /* all categories we currently handle have action_code */
1541 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1542 return RX_DROP_MONITOR;
1543
1544 /*
1545 * FIXME: revisit this, I'm sure we should handle most
1546 * of these frames in other modes as well!
1547 */
1548 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1549 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1550 return RX_CONTINUE;
1551
1552 switch (mgmt->u.action.category) {
1553 case WLAN_CATEGORY_BACK:
1554 switch (mgmt->u.action.u.addba_req.action_code) {
1555 case WLAN_ACTION_ADDBA_REQ:
1556 if (len < (IEEE80211_MIN_ACTION_SIZE +
1557 sizeof(mgmt->u.action.u.addba_req)))
1558 return RX_DROP_MONITOR;
1559 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1560 break;
1561 case WLAN_ACTION_ADDBA_RESP:
1562 if (len < (IEEE80211_MIN_ACTION_SIZE +
1563 sizeof(mgmt->u.action.u.addba_resp)))
1564 return RX_DROP_MONITOR;
1565 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1566 break;
1567 case WLAN_ACTION_DELBA:
1568 if (len < (IEEE80211_MIN_ACTION_SIZE +
1569 sizeof(mgmt->u.action.u.delba)))
1570 return RX_DROP_MONITOR;
1571 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1572 break;
1573 }
1574 break;
1575 case WLAN_CATEGORY_SPECTRUM_MGMT:
1576 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1577 return RX_DROP_MONITOR;
1578 switch (mgmt->u.action.u.measurement.action_code) {
1579 case WLAN_ACTION_SPCT_MSR_REQ:
1580 if (len < (IEEE80211_MIN_ACTION_SIZE +
1581 sizeof(mgmt->u.action.u.measurement)))
1582 return RX_DROP_MONITOR;
1583 ieee80211_process_measurement_req(sdata, mgmt, len);
1584 break;
1585 }
1586 break;
1587 default:
1588 return RX_CONTINUE;
1589 }
1590
1591 rx->sta->rx_packets++;
1592 dev_kfree_skb(rx->skb);
1593 return RX_QUEUED;
1594 }
1595
1596 static ieee80211_rx_result debug_noinline
1597 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1598 {
1599 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1600
1601 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1602 return RX_DROP_MONITOR;
1603
1604 if (ieee80211_vif_is_mesh(&sdata->vif))
1605 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1606
1607 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1608 sdata->vif.type != NL80211_IFTYPE_ADHOC)
1609 return RX_DROP_MONITOR;
1610
1611 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
1612 return RX_DROP_MONITOR;
1613
1614 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
1615 return RX_QUEUED;
1616 }
1617
1618 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1619 struct ieee80211_hdr *hdr,
1620 struct ieee80211_rx_data *rx)
1621 {
1622 int keyidx;
1623 unsigned int hdrlen;
1624
1625 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1626 if (rx->skb->len >= hdrlen + 4)
1627 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1628 else
1629 keyidx = -1;
1630
1631 if (!rx->sta) {
1632 /*
1633 * Some hardware seem to generate incorrect Michael MIC
1634 * reports; ignore them to avoid triggering countermeasures.
1635 */
1636 goto ignore;
1637 }
1638
1639 if (!ieee80211_has_protected(hdr->frame_control))
1640 goto ignore;
1641
1642 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1643 /*
1644 * APs with pairwise keys should never receive Michael MIC
1645 * errors for non-zero keyidx because these are reserved for
1646 * group keys and only the AP is sending real multicast
1647 * frames in the BSS.
1648 */
1649 goto ignore;
1650 }
1651
1652 if (!ieee80211_is_data(hdr->frame_control) &&
1653 !ieee80211_is_auth(hdr->frame_control))
1654 goto ignore;
1655
1656 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
1657 ignore:
1658 dev_kfree_skb(rx->skb);
1659 rx->skb = NULL;
1660 }
1661
1662 /* TODO: use IEEE80211_RX_FRAGMENTED */
1663 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1664 {
1665 struct ieee80211_sub_if_data *sdata;
1666 struct ieee80211_local *local = rx->local;
1667 struct ieee80211_rtap_hdr {
1668 struct ieee80211_radiotap_header hdr;
1669 u8 flags;
1670 u8 rate;
1671 __le16 chan_freq;
1672 __le16 chan_flags;
1673 } __attribute__ ((packed)) *rthdr;
1674 struct sk_buff *skb = rx->skb, *skb2;
1675 struct net_device *prev_dev = NULL;
1676 struct ieee80211_rx_status *status = rx->status;
1677
1678 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1679 goto out_free_skb;
1680
1681 if (skb_headroom(skb) < sizeof(*rthdr) &&
1682 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1683 goto out_free_skb;
1684
1685 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1686 memset(rthdr, 0, sizeof(*rthdr));
1687 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1688 rthdr->hdr.it_present =
1689 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1690 (1 << IEEE80211_RADIOTAP_RATE) |
1691 (1 << IEEE80211_RADIOTAP_CHANNEL));
1692
1693 rthdr->rate = rx->rate->bitrate / 5;
1694 rthdr->chan_freq = cpu_to_le16(status->freq);
1695
1696 if (status->band == IEEE80211_BAND_5GHZ)
1697 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1698 IEEE80211_CHAN_5GHZ);
1699 else
1700 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1701 IEEE80211_CHAN_2GHZ);
1702
1703 skb_set_mac_header(skb, 0);
1704 skb->ip_summed = CHECKSUM_UNNECESSARY;
1705 skb->pkt_type = PACKET_OTHERHOST;
1706 skb->protocol = htons(ETH_P_802_2);
1707
1708 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1709 if (!netif_running(sdata->dev))
1710 continue;
1711
1712 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1713 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1714 continue;
1715
1716 if (prev_dev) {
1717 skb2 = skb_clone(skb, GFP_ATOMIC);
1718 if (skb2) {
1719 skb2->dev = prev_dev;
1720 netif_rx(skb2);
1721 }
1722 }
1723
1724 prev_dev = sdata->dev;
1725 sdata->dev->stats.rx_packets++;
1726 sdata->dev->stats.rx_bytes += skb->len;
1727 }
1728
1729 if (prev_dev) {
1730 skb->dev = prev_dev;
1731 netif_rx(skb);
1732 skb = NULL;
1733 } else
1734 goto out_free_skb;
1735
1736 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1737 return;
1738
1739 out_free_skb:
1740 dev_kfree_skb(skb);
1741 }
1742
1743
1744 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1745 struct ieee80211_rx_data *rx,
1746 struct sk_buff *skb)
1747 {
1748 ieee80211_rx_result res = RX_DROP_MONITOR;
1749
1750 rx->skb = skb;
1751 rx->sdata = sdata;
1752 rx->dev = sdata->dev;
1753
1754 #define CALL_RXH(rxh) \
1755 do { \
1756 res = rxh(rx); \
1757 if (res != RX_CONTINUE) \
1758 goto rxh_done; \
1759 } while (0);
1760
1761 CALL_RXH(ieee80211_rx_h_passive_scan)
1762 CALL_RXH(ieee80211_rx_h_check)
1763 CALL_RXH(ieee80211_rx_h_decrypt)
1764 CALL_RXH(ieee80211_rx_h_sta_process)
1765 CALL_RXH(ieee80211_rx_h_defragment)
1766 CALL_RXH(ieee80211_rx_h_ps_poll)
1767 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1768 /* must be after MMIC verify so header is counted in MPDU mic */
1769 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1770 CALL_RXH(ieee80211_rx_h_amsdu)
1771 #ifdef CONFIG_MAC80211_MESH
1772 if (ieee80211_vif_is_mesh(&sdata->vif))
1773 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1774 #endif
1775 CALL_RXH(ieee80211_rx_h_data)
1776 CALL_RXH(ieee80211_rx_h_ctrl)
1777 CALL_RXH(ieee80211_rx_h_action)
1778 CALL_RXH(ieee80211_rx_h_mgmt)
1779
1780 #undef CALL_RXH
1781
1782 rxh_done:
1783 switch (res) {
1784 case RX_DROP_MONITOR:
1785 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1786 if (rx->sta)
1787 rx->sta->rx_dropped++;
1788 /* fall through */
1789 case RX_CONTINUE:
1790 ieee80211_rx_cooked_monitor(rx);
1791 break;
1792 case RX_DROP_UNUSABLE:
1793 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1794 if (rx->sta)
1795 rx->sta->rx_dropped++;
1796 dev_kfree_skb(rx->skb);
1797 break;
1798 case RX_QUEUED:
1799 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1800 break;
1801 }
1802 }
1803
1804 /* main receive path */
1805
1806 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
1807 u8 *bssid, struct ieee80211_rx_data *rx,
1808 struct ieee80211_hdr *hdr)
1809 {
1810 int multicast = is_multicast_ether_addr(hdr->addr1);
1811
1812 switch (sdata->vif.type) {
1813 case NL80211_IFTYPE_STATION:
1814 if (!bssid)
1815 return 0;
1816 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1817 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1818 return 0;
1819 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1820 } else if (!multicast &&
1821 compare_ether_addr(sdata->dev->dev_addr,
1822 hdr->addr1) != 0) {
1823 if (!(sdata->dev->flags & IFF_PROMISC))
1824 return 0;
1825 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1826 }
1827 break;
1828 case NL80211_IFTYPE_ADHOC:
1829 if (!bssid)
1830 return 0;
1831 if (ieee80211_is_beacon(hdr->frame_control)) {
1832 return 1;
1833 }
1834 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
1835 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1836 return 0;
1837 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1838 } else if (!multicast &&
1839 compare_ether_addr(sdata->dev->dev_addr,
1840 hdr->addr1) != 0) {
1841 if (!(sdata->dev->flags & IFF_PROMISC))
1842 return 0;
1843 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1844 } else if (!rx->sta)
1845 rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
1846 bssid, hdr->addr2,
1847 BIT(rx->status->rate_idx));
1848 break;
1849 case NL80211_IFTYPE_MESH_POINT:
1850 if (!multicast &&
1851 compare_ether_addr(sdata->dev->dev_addr,
1852 hdr->addr1) != 0) {
1853 if (!(sdata->dev->flags & IFF_PROMISC))
1854 return 0;
1855
1856 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1857 }
1858 break;
1859 case NL80211_IFTYPE_AP_VLAN:
1860 case NL80211_IFTYPE_AP:
1861 if (!bssid) {
1862 if (compare_ether_addr(sdata->dev->dev_addr,
1863 hdr->addr1))
1864 return 0;
1865 } else if (!ieee80211_bssid_match(bssid,
1866 sdata->dev->dev_addr)) {
1867 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
1868 return 0;
1869 rx->flags &= ~IEEE80211_RX_RA_MATCH;
1870 }
1871 break;
1872 case NL80211_IFTYPE_WDS:
1873 if (bssid || !ieee80211_is_data(hdr->frame_control))
1874 return 0;
1875 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1876 return 0;
1877 break;
1878 case NL80211_IFTYPE_MONITOR:
1879 /* take everything */
1880 break;
1881 case NL80211_IFTYPE_UNSPECIFIED:
1882 case __NL80211_IFTYPE_AFTER_LAST:
1883 /* should never get here */
1884 WARN_ON(1);
1885 break;
1886 }
1887
1888 return 1;
1889 }
1890
1891 /*
1892 * This is the actual Rx frames handler. as it blongs to Rx path it must
1893 * be called with rcu_read_lock protection.
1894 */
1895 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1896 struct sk_buff *skb,
1897 struct ieee80211_rx_status *status,
1898 struct ieee80211_rate *rate)
1899 {
1900 struct ieee80211_local *local = hw_to_local(hw);
1901 struct ieee80211_sub_if_data *sdata;
1902 struct ieee80211_hdr *hdr;
1903 struct ieee80211_rx_data rx;
1904 int prepares;
1905 struct ieee80211_sub_if_data *prev = NULL;
1906 struct sk_buff *skb_new;
1907 u8 *bssid;
1908
1909 hdr = (struct ieee80211_hdr *)skb->data;
1910 memset(&rx, 0, sizeof(rx));
1911 rx.skb = skb;
1912 rx.local = local;
1913
1914 rx.status = status;
1915 rx.rate = rate;
1916
1917 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
1918 local->dot11ReceivedFragmentCount++;
1919
1920 rx.sta = sta_info_get(local, hdr->addr2);
1921 if (rx.sta) {
1922 rx.sdata = rx.sta->sdata;
1923 rx.dev = rx.sta->sdata->dev;
1924 }
1925
1926 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
1927 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
1928 return;
1929 }
1930
1931 if (unlikely(local->sw_scanning || local->hw_scanning))
1932 rx.flags |= IEEE80211_RX_IN_SCAN;
1933
1934 ieee80211_parse_qos(&rx);
1935 ieee80211_verify_ip_alignment(&rx);
1936
1937 skb = rx.skb;
1938
1939 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1940 if (!netif_running(sdata->dev))
1941 continue;
1942
1943 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1944 continue;
1945
1946 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
1947 rx.flags |= IEEE80211_RX_RA_MATCH;
1948 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
1949
1950 if (!prepares)
1951 continue;
1952
1953 /*
1954 * frame is destined for this interface, but if it's not
1955 * also for the previous one we handle that after the
1956 * loop to avoid copying the SKB once too much
1957 */
1958
1959 if (!prev) {
1960 prev = sdata;
1961 continue;
1962 }
1963
1964 /*
1965 * frame was destined for the previous interface
1966 * so invoke RX handlers for it
1967 */
1968
1969 skb_new = skb_copy(skb, GFP_ATOMIC);
1970 if (!skb_new) {
1971 if (net_ratelimit())
1972 printk(KERN_DEBUG "%s: failed to copy "
1973 "multicast frame for %s\n",
1974 wiphy_name(local->hw.wiphy),
1975 prev->dev->name);
1976 continue;
1977 }
1978 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
1979 prev = sdata;
1980 }
1981 if (prev)
1982 ieee80211_invoke_rx_handlers(prev, &rx, skb);
1983 else
1984 dev_kfree_skb(skb);
1985 }
1986
1987 #define SEQ_MODULO 0x1000
1988 #define SEQ_MASK 0xfff
1989
1990 static inline int seq_less(u16 sq1, u16 sq2)
1991 {
1992 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
1993 }
1994
1995 static inline u16 seq_inc(u16 sq)
1996 {
1997 return (sq + 1) & SEQ_MASK;
1998 }
1999
2000 static inline u16 seq_sub(u16 sq1, u16 sq2)
2001 {
2002 return (sq1 - sq2) & SEQ_MASK;
2003 }
2004
2005
2006 /*
2007 * As it function blongs to Rx path it must be called with
2008 * the proper rcu_read_lock protection for its flow.
2009 */
2010 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2011 struct tid_ampdu_rx *tid_agg_rx,
2012 struct sk_buff *skb,
2013 u16 mpdu_seq_num,
2014 int bar_req)
2015 {
2016 struct ieee80211_local *local = hw_to_local(hw);
2017 struct ieee80211_rx_status status;
2018 u16 head_seq_num, buf_size;
2019 int index;
2020 struct ieee80211_supported_band *sband;
2021 struct ieee80211_rate *rate;
2022
2023 buf_size = tid_agg_rx->buf_size;
2024 head_seq_num = tid_agg_rx->head_seq_num;
2025
2026 /* frame with out of date sequence number */
2027 if (seq_less(mpdu_seq_num, head_seq_num)) {
2028 dev_kfree_skb(skb);
2029 return 1;
2030 }
2031
2032 /* if frame sequence number exceeds our buffering window size or
2033 * block Ack Request arrived - release stored frames */
2034 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2035 /* new head to the ordering buffer */
2036 if (bar_req)
2037 head_seq_num = mpdu_seq_num;
2038 else
2039 head_seq_num =
2040 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2041 /* release stored frames up to new head to stack */
2042 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2043 index = seq_sub(tid_agg_rx->head_seq_num,
2044 tid_agg_rx->ssn)
2045 % tid_agg_rx->buf_size;
2046
2047 if (tid_agg_rx->reorder_buf[index]) {
2048 /* release the reordered frames to stack */
2049 memcpy(&status,
2050 tid_agg_rx->reorder_buf[index]->cb,
2051 sizeof(status));
2052 sband = local->hw.wiphy->bands[status.band];
2053 rate = &sband->bitrates[status.rate_idx];
2054 __ieee80211_rx_handle_packet(hw,
2055 tid_agg_rx->reorder_buf[index],
2056 &status, rate);
2057 tid_agg_rx->stored_mpdu_num--;
2058 tid_agg_rx->reorder_buf[index] = NULL;
2059 }
2060 tid_agg_rx->head_seq_num =
2061 seq_inc(tid_agg_rx->head_seq_num);
2062 }
2063 if (bar_req)
2064 return 1;
2065 }
2066
2067 /* now the new frame is always in the range of the reordering */
2068 /* buffer window */
2069 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2070 % tid_agg_rx->buf_size;
2071 /* check if we already stored this frame */
2072 if (tid_agg_rx->reorder_buf[index]) {
2073 dev_kfree_skb(skb);
2074 return 1;
2075 }
2076
2077 /* if arrived mpdu is in the right order and nothing else stored */
2078 /* release it immediately */
2079 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2080 tid_agg_rx->stored_mpdu_num == 0) {
2081 tid_agg_rx->head_seq_num =
2082 seq_inc(tid_agg_rx->head_seq_num);
2083 return 0;
2084 }
2085
2086 /* put the frame in the reordering buffer */
2087 tid_agg_rx->reorder_buf[index] = skb;
2088 tid_agg_rx->stored_mpdu_num++;
2089 /* release the buffer until next missing frame */
2090 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2091 % tid_agg_rx->buf_size;
2092 while (tid_agg_rx->reorder_buf[index]) {
2093 /* release the reordered frame back to stack */
2094 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2095 sizeof(status));
2096 sband = local->hw.wiphy->bands[status.band];
2097 rate = &sband->bitrates[status.rate_idx];
2098 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
2099 &status, rate);
2100 tid_agg_rx->stored_mpdu_num--;
2101 tid_agg_rx->reorder_buf[index] = NULL;
2102 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2103 index = seq_sub(tid_agg_rx->head_seq_num,
2104 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2105 }
2106 return 1;
2107 }
2108
2109 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2110 struct sk_buff *skb)
2111 {
2112 struct ieee80211_hw *hw = &local->hw;
2113 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2114 struct sta_info *sta;
2115 struct tid_ampdu_rx *tid_agg_rx;
2116 u16 sc;
2117 u16 mpdu_seq_num;
2118 u8 ret = 0;
2119 int tid;
2120
2121 sta = sta_info_get(local, hdr->addr2);
2122 if (!sta)
2123 return ret;
2124
2125 /* filter the QoS data rx stream according to
2126 * STA/TID and check if this STA/TID is on aggregation */
2127 if (!ieee80211_is_data_qos(hdr->frame_control))
2128 goto end_reorder;
2129
2130 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2131
2132 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2133 goto end_reorder;
2134
2135 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2136
2137 /* qos null data frames are excluded */
2138 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2139 goto end_reorder;
2140
2141 /* new un-ordered ampdu frame - process it */
2142
2143 /* reset session timer */
2144 if (tid_agg_rx->timeout) {
2145 unsigned long expires =
2146 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2147 mod_timer(&tid_agg_rx->session_timer, expires);
2148 }
2149
2150 /* if this mpdu is fragmented - terminate rx aggregation session */
2151 sc = le16_to_cpu(hdr->seq_ctrl);
2152 if (sc & IEEE80211_SCTL_FRAG) {
2153 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2154 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2155 ret = 1;
2156 goto end_reorder;
2157 }
2158
2159 /* according to mpdu sequence number deal with reordering buffer */
2160 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2161 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2162 mpdu_seq_num, 0);
2163 end_reorder:
2164 return ret;
2165 }
2166
2167 /*
2168 * This is the receive path handler. It is called by a low level driver when an
2169 * 802.11 MPDU is received from the hardware.
2170 */
2171 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2172 struct ieee80211_rx_status *status)
2173 {
2174 struct ieee80211_local *local = hw_to_local(hw);
2175 struct ieee80211_rate *rate = NULL;
2176 struct ieee80211_supported_band *sband;
2177
2178 if (status->band < 0 ||
2179 status->band >= IEEE80211_NUM_BANDS) {
2180 WARN_ON(1);
2181 return;
2182 }
2183
2184 sband = local->hw.wiphy->bands[status->band];
2185
2186 if (!sband ||
2187 status->rate_idx < 0 ||
2188 status->rate_idx >= sband->n_bitrates) {
2189 WARN_ON(1);
2190 return;
2191 }
2192
2193 rate = &sband->bitrates[status->rate_idx];
2194
2195 /*
2196 * key references and virtual interfaces are protected using RCU
2197 * and this requires that we are in a read-side RCU section during
2198 * receive processing
2199 */
2200 rcu_read_lock();
2201
2202 /*
2203 * Frames with failed FCS/PLCP checksum are not returned,
2204 * all other frames are returned without radiotap header
2205 * if it was previously present.
2206 * Also, frames with less than 16 bytes are dropped.
2207 */
2208 skb = ieee80211_rx_monitor(local, skb, status, rate);
2209 if (!skb) {
2210 rcu_read_unlock();
2211 return;
2212 }
2213
2214 if (!ieee80211_rx_reorder_ampdu(local, skb))
2215 __ieee80211_rx_handle_packet(hw, skb, status, rate);
2216
2217 rcu_read_unlock();
2218 }
2219 EXPORT_SYMBOL(__ieee80211_rx);
2220
2221 /* This is a version of the rx handler that can be called from hard irq
2222 * context. Post the skb on the queue and schedule the tasklet */
2223 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2224 struct ieee80211_rx_status *status)
2225 {
2226 struct ieee80211_local *local = hw_to_local(hw);
2227
2228 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2229
2230 skb->dev = local->mdev;
2231 /* copy status into skb->cb for use by tasklet */
2232 memcpy(skb->cb, status, sizeof(*status));
2233 skb->pkt_type = IEEE80211_RX_MSG;
2234 skb_queue_tail(&local->skb_queue, skb);
2235 tasklet_schedule(&local->tasklet);
2236 }
2237 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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