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cfg80211: use proper allocation flags
[GitHub/mt8127/android_kernel_alcatel_ttab.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 "driver-ops.h"
23 #include "led.h"
24 #include "mesh.h"
25 #include "wep.h"
26 #include "wpa.h"
27 #include "tkip.h"
28 #include "wme.h"
29
30 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
31 struct tid_ampdu_rx *tid_agg_rx,
32 struct sk_buff *skb,
33 u16 mpdu_seq_num,
34 int bar_req);
35 /*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
42 struct sk_buff *skb,
43 int rtap_len)
44 {
45 skb_pull(skb, rtap_len);
46
47 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
48 if (likely(skb->len > FCS_LEN))
49 skb_trim(skb, skb->len - FCS_LEN);
50 else {
51 /* driver bug */
52 WARN_ON(1);
53 dev_kfree_skb(skb);
54 skb = NULL;
55 }
56 }
57
58 return skb;
59 }
60
61 static inline int should_drop_frame(struct sk_buff *skb,
62 int present_fcs_len,
63 int radiotap_len)
64 {
65 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
66 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
67
68 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
69 return 1;
70 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
71 return 1;
72 if (ieee80211_is_ctl(hdr->frame_control) &&
73 !ieee80211_is_pspoll(hdr->frame_control) &&
74 !ieee80211_is_back_req(hdr->frame_control))
75 return 1;
76 return 0;
77 }
78
79 static int
80 ieee80211_rx_radiotap_len(struct ieee80211_local *local,
81 struct ieee80211_rx_status *status)
82 {
83 int len;
84
85 /* always present fields */
86 len = sizeof(struct ieee80211_radiotap_header) + 9;
87
88 if (status->flag & RX_FLAG_TSFT)
89 len += 8;
90 if (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_rate *rate,
114 int rtap_len)
115 {
116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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_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_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
147 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
148 if (status->flag & RX_FLAG_SHORTPRE)
149 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
150 pos++;
151
152 /* IEEE80211_RADIOTAP_RATE */
153 if (status->flag & RX_FLAG_HT) {
154 /*
155 * TODO: add following information into radiotap header once
156 * suitable fields are defined for it:
157 * - MCS index (status->rate_idx)
158 * - HT40 (status->flag & RX_FLAG_40MHZ)
159 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
160 */
161 *pos = 0;
162 } else {
163 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
164 *pos = rate->bitrate / 5;
165 }
166 pos++;
167
168 /* IEEE80211_RADIOTAP_CHANNEL */
169 *(__le16 *)pos = cpu_to_le16(status->freq);
170 pos += 2;
171 if (status->band == IEEE80211_BAND_5GHZ)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_5GHZ);
174 else if (rate->flags & IEEE80211_RATE_ERP_G)
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
176 IEEE80211_CHAN_2GHZ);
177 else
178 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
179 IEEE80211_CHAN_2GHZ);
180 pos += 2;
181
182 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
183 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
184 *pos = status->signal;
185 rthdr->it_present |=
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
187 pos++;
188 }
189
190 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
191 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
192 *pos = status->noise;
193 rthdr->it_present |=
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
195 pos++;
196 }
197
198 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199
200 /* IEEE80211_RADIOTAP_ANTENNA */
201 *pos = status->antenna;
202 pos++;
203
204 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205
206 /* IEEE80211_RADIOTAP_RX_FLAGS */
207 /* ensure 2 byte alignment for the 2 byte field as required */
208 if ((pos - (unsigned char *)rthdr) & 1)
209 pos++;
210 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
211 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
212 pos += 2;
213 }
214
215 /*
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
219 */
220 static struct sk_buff *
221 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
222 struct ieee80211_rate *rate)
223 {
224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
225 struct ieee80211_sub_if_data *sdata;
226 int needed_headroom = 0;
227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
230 int rtap_len = 0;
231
232 /*
233 * First, we may need to make a copy of the skb because
234 * (1) we need to modify it for radiotap (if not present), and
235 * (2) the other RX handlers will modify the skb we got.
236 *
237 * We don't need to, of course, if we aren't going to return
238 * the SKB because it has a bad FCS/PLCP checksum.
239 */
240 if (status->flag & RX_FLAG_RADIOTAP)
241 rtap_len = ieee80211_get_radiotap_len(origskb->data);
242 else
243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
245
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
248
249 if (!local->monitors) {
250 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
251 dev_kfree_skb(origskb);
252 return NULL;
253 }
254
255 return remove_monitor_info(local, origskb, rtap_len);
256 }
257
258 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
259 /* only need to expand headroom if necessary */
260 skb = origskb;
261 origskb = NULL;
262
263 /*
264 * This shouldn't trigger often because most devices have an
265 * RX header they pull before we get here, and that should
266 * be big enough for our radiotap information. We should
267 * probably export the length to drivers so that we can have
268 * them allocate enough headroom to start with.
269 */
270 if (skb_headroom(skb) < needed_headroom &&
271 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
272 dev_kfree_skb(skb);
273 return NULL;
274 }
275 } else {
276 /*
277 * Need to make a copy and possibly remove radiotap header
278 * and FCS from the original.
279 */
280 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281
282 origskb = remove_monitor_info(local, origskb, rtap_len);
283
284 if (!skb)
285 return origskb;
286 }
287
288 /* if necessary, prepend radiotap information */
289 if (!(status->flag & RX_FLAG_RADIOTAP))
290 ieee80211_add_rx_radiotap_header(local, skb, rate,
291 needed_headroom);
292
293 skb_reset_mac_header(skb);
294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 if (!netif_running(sdata->dev))
300 continue;
301
302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
303 continue;
304
305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
306 continue;
307
308 if (prev_dev) {
309 skb2 = skb_clone(skb, GFP_ATOMIC);
310 if (skb2) {
311 skb2->dev = prev_dev;
312 netif_rx(skb2);
313 }
314 }
315
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
319 }
320
321 if (prev_dev) {
322 skb->dev = prev_dev;
323 netif_rx(skb);
324 } else
325 dev_kfree_skb(skb);
326
327 return origskb;
328 }
329
330
331 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
332 {
333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
334 int tid;
335
336 /* does the frame have a qos control field? */
337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
339 /* frame has qos control */
340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
342 rx->flags |= IEEE80211_RX_AMSDU;
343 else
344 rx->flags &= ~IEEE80211_RX_AMSDU;
345 } else {
346 /*
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 *
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
354 *
355 * We also use that counter for non-QoS STAs.
356 */
357 tid = NUM_RX_DATA_QUEUES - 1;
358 }
359
360 rx->queue = tid;
361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
364 }
365
366 /**
367 * DOC: Packet alignment
368 *
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * to the stack.
371 *
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
377 * in front of it).
378 *
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
384 *
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
388 */
389 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
390 {
391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
392 int hdrlen;
393
394 #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
395 return;
396 #endif
397
398 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
399 "unaligned packet at 0x%p\n", rx->skb->data))
400 return;
401
402 if (!ieee80211_is_data_present(hdr->frame_control))
403 return;
404
405 hdrlen = ieee80211_hdrlen(hdr->frame_control);
406 if (rx->flags & IEEE80211_RX_AMSDU)
407 hdrlen += ETH_HLEN;
408 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
409 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
410 }
411
412
413 /* rx handlers */
414
415 static ieee80211_rx_result debug_noinline
416 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
417 {
418 struct ieee80211_local *local = rx->local;
419 struct sk_buff *skb = rx->skb;
420
421 if (unlikely(local->hw_scanning))
422 return ieee80211_scan_rx(rx->sdata, skb);
423
424 if (unlikely(local->sw_scanning)) {
425 /* drop all the other packets during a software scan anyway */
426 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
427 dev_kfree_skb(skb);
428 return RX_QUEUED;
429 }
430
431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
434 return RX_DROP_UNUSABLE;
435 }
436
437 return RX_CONTINUE;
438 }
439
440
441 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
442 {
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449 }
450
451
452 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
453 {
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
455
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
457 return 0;
458
459 return ieee80211_is_robust_mgmt_frame(hdr);
460 }
461
462
463 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
465 {
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
468
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
471 return -1;
472
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
475
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
480 return -1;
481
482 return le16_to_cpu(mmie->key_id);
483 }
484
485
486 static ieee80211_rx_result
487 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
488 {
489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
491
492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
497 }
498
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
501 */
502
503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
504 struct ieee80211_mgmt *mgmt;
505
506 if (!ieee80211_is_mgmt(hdr->frame_control))
507 return RX_DROP_MONITOR;
508
509 if (ieee80211_is_action(hdr->frame_control)) {
510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
513 return RX_CONTINUE;
514 }
515
516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
519 return RX_CONTINUE;
520
521 return RX_DROP_MONITOR;
522
523 }
524
525 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
526
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
530 return RX_DROP_MONITOR;
531 #undef msh_h_get
532
533 return RX_CONTINUE;
534 }
535
536
537 static ieee80211_rx_result debug_noinline
538 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
539 {
540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
541
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
545 rx->sta->last_seq_ctrl[rx->queue] ==
546 hdr->seq_ctrl)) {
547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
550 }
551 return RX_DROP_MONITOR;
552 } else
553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
554 }
555
556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
558 return RX_DROP_MONITOR;
559 }
560
561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
563 *
564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
568 */
569
570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
571 return ieee80211_rx_mesh_check(rx);
572
573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
581 /* Drop IBSS frames and frames for other hosts
582 * silently. */
583 return RX_DROP_MONITOR;
584 }
585
586 return RX_DROP_MONITOR;
587 }
588
589 return RX_CONTINUE;
590 }
591
592
593 static ieee80211_rx_result debug_noinline
594 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
595 {
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
597 int keyidx;
598 int hdrlen;
599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
600 struct ieee80211_key *stakey = NULL;
601 int mmie_keyidx = -1;
602
603 /*
604 * Key selection 101
605 *
606 * There are four types of keys:
607 * - GTK (group keys)
608 * - IGTK (group keys for management frames)
609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
611 *
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
618 *
619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
622 *
623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
627 * possible.
628 */
629
630 /*
631 * No point in finding a key and decrypting if the frame is neither
632 * addressed to us nor a multicast frame.
633 */
634 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
635 return RX_CONTINUE;
636
637 if (rx->sta)
638 stakey = rcu_dereference(rx->sta->key);
639
640 if (!ieee80211_has_protected(hdr->frame_control))
641 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
642
643 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
644 rx->key = stakey;
645 /* Skip decryption if the frame is not protected. */
646 if (!ieee80211_has_protected(hdr->frame_control))
647 return RX_CONTINUE;
648 } else if (mmie_keyidx >= 0) {
649 /* Broadcast/multicast robust management frame / BIP */
650 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
651 (rx->status->flag & RX_FLAG_IV_STRIPPED))
652 return RX_CONTINUE;
653
654 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
655 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
656 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
657 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
658 } else if (!ieee80211_has_protected(hdr->frame_control)) {
659 /*
660 * The frame was not protected, so skip decryption. However, we
661 * need to set rx->key if there is a key that could have been
662 * used so that the frame may be dropped if encryption would
663 * have been expected.
664 */
665 struct ieee80211_key *key = NULL;
666 if (ieee80211_is_mgmt(hdr->frame_control) &&
667 is_multicast_ether_addr(hdr->addr1) &&
668 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
669 rx->key = key;
670 else if ((key = rcu_dereference(rx->sdata->default_key)))
671 rx->key = key;
672 return RX_CONTINUE;
673 } else {
674 /*
675 * The device doesn't give us the IV so we won't be
676 * able to look up the key. That's ok though, we
677 * don't need to decrypt the frame, we just won't
678 * be able to keep statistics accurate.
679 * Except for key threshold notifications, should
680 * we somehow allow the driver to tell us which key
681 * the hardware used if this flag is set?
682 */
683 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
684 (rx->status->flag & RX_FLAG_IV_STRIPPED))
685 return RX_CONTINUE;
686
687 hdrlen = ieee80211_hdrlen(hdr->frame_control);
688
689 if (rx->skb->len < 8 + hdrlen)
690 return RX_DROP_UNUSABLE; /* TODO: count this? */
691
692 /*
693 * no need to call ieee80211_wep_get_keyidx,
694 * it verifies a bunch of things we've done already
695 */
696 keyidx = rx->skb->data[hdrlen + 3] >> 6;
697
698 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
699
700 /*
701 * RSNA-protected unicast frames should always be sent with
702 * pairwise or station-to-station keys, but for WEP we allow
703 * using a key index as well.
704 */
705 if (rx->key && rx->key->conf.alg != ALG_WEP &&
706 !is_multicast_ether_addr(hdr->addr1))
707 rx->key = NULL;
708 }
709
710 if (rx->key) {
711 rx->key->tx_rx_count++;
712 /* TODO: add threshold stuff again */
713 } else {
714 return RX_DROP_MONITOR;
715 }
716
717 /* Check for weak IVs if possible */
718 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
719 ieee80211_is_data(hdr->frame_control) &&
720 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
721 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
722 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
723 rx->sta->wep_weak_iv_count++;
724
725 switch (rx->key->conf.alg) {
726 case ALG_WEP:
727 result = ieee80211_crypto_wep_decrypt(rx);
728 break;
729 case ALG_TKIP:
730 result = ieee80211_crypto_tkip_decrypt(rx);
731 break;
732 case ALG_CCMP:
733 result = ieee80211_crypto_ccmp_decrypt(rx);
734 break;
735 case ALG_AES_CMAC:
736 result = ieee80211_crypto_aes_cmac_decrypt(rx);
737 break;
738 }
739
740 /* either the frame has been decrypted or will be dropped */
741 rx->status->flag |= RX_FLAG_DECRYPTED;
742
743 return result;
744 }
745
746 static ieee80211_rx_result debug_noinline
747 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
748 {
749 struct ieee80211_local *local;
750 struct ieee80211_hdr *hdr;
751 struct sk_buff *skb;
752
753 local = rx->local;
754 skb = rx->skb;
755 hdr = (struct ieee80211_hdr *) skb->data;
756
757 if (!local->pspolling)
758 return RX_CONTINUE;
759
760 if (!ieee80211_has_fromds(hdr->frame_control))
761 /* this is not from AP */
762 return RX_CONTINUE;
763
764 if (!ieee80211_is_data(hdr->frame_control))
765 return RX_CONTINUE;
766
767 if (!ieee80211_has_moredata(hdr->frame_control)) {
768 /* AP has no more frames buffered for us */
769 local->pspolling = false;
770 return RX_CONTINUE;
771 }
772
773 /* more data bit is set, let's request a new frame from the AP */
774 ieee80211_send_pspoll(local, rx->sdata);
775
776 return RX_CONTINUE;
777 }
778
779 static void ap_sta_ps_start(struct sta_info *sta)
780 {
781 struct ieee80211_sub_if_data *sdata = sta->sdata;
782 struct ieee80211_local *local = sdata->local;
783
784 atomic_inc(&sdata->bss->num_sta_ps);
785 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
786 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
787 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
788 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
789 sdata->dev->name, sta->sta.addr, sta->sta.aid);
790 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
791 }
792
793 static int ap_sta_ps_end(struct sta_info *sta)
794 {
795 struct ieee80211_sub_if_data *sdata = sta->sdata;
796 struct ieee80211_local *local = sdata->local;
797 int sent, buffered;
798
799 atomic_dec(&sdata->bss->num_sta_ps);
800
801 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
802 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
803
804 if (!skb_queue_empty(&sta->ps_tx_buf))
805 sta_info_clear_tim_bit(sta);
806
807 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
808 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
809 sdata->dev->name, sta->sta.addr, sta->sta.aid);
810 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
811
812 /* Send all buffered frames to the station */
813 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
814 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
815 sent += buffered;
816 local->total_ps_buffered -= buffered;
817
818 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
819 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
820 "since STA not sleeping anymore\n", sdata->dev->name,
821 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
822 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
823
824 return sent;
825 }
826
827 static ieee80211_rx_result debug_noinline
828 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
829 {
830 struct sta_info *sta = rx->sta;
831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
832
833 if (!sta)
834 return RX_CONTINUE;
835
836 /* Update last_rx only for IBSS packets which are for the current
837 * BSSID to avoid keeping the current IBSS network alive in cases where
838 * other STAs are using different BSSID. */
839 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
840 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
841 NL80211_IFTYPE_ADHOC);
842 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
843 sta->last_rx = jiffies;
844 } else
845 if (!is_multicast_ether_addr(hdr->addr1) ||
846 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
847 /* Update last_rx only for unicast frames in order to prevent
848 * the Probe Request frames (the only broadcast frames from a
849 * STA in infrastructure mode) from keeping a connection alive.
850 * Mesh beacons will update last_rx when if they are found to
851 * match the current local configuration when processed.
852 */
853 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
854 ieee80211_is_beacon(hdr->frame_control)) {
855 rx->sdata->u.mgd.last_beacon = jiffies;
856 } else
857 sta->last_rx = jiffies;
858 }
859
860 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
861 return RX_CONTINUE;
862
863 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
864 ieee80211_sta_rx_notify(rx->sdata, hdr);
865
866 sta->rx_fragments++;
867 sta->rx_bytes += rx->skb->len;
868 sta->last_signal = rx->status->signal;
869 sta->last_qual = rx->status->qual;
870 sta->last_noise = rx->status->noise;
871
872 /*
873 * Change STA power saving mode only at the end of a frame
874 * exchange sequence.
875 */
876 if (!ieee80211_has_morefrags(hdr->frame_control) &&
877 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
878 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
879 if (test_sta_flags(sta, WLAN_STA_PS)) {
880 /*
881 * Ignore doze->wake transitions that are
882 * indicated by non-data frames, the standard
883 * is unclear here, but for example going to
884 * PS mode and then scanning would cause a
885 * doze->wake transition for the probe request,
886 * and that is clearly undesirable.
887 */
888 if (ieee80211_is_data(hdr->frame_control) &&
889 !ieee80211_has_pm(hdr->frame_control))
890 rx->sent_ps_buffered += ap_sta_ps_end(sta);
891 } else {
892 if (ieee80211_has_pm(hdr->frame_control))
893 ap_sta_ps_start(sta);
894 }
895 }
896
897 /* Drop data::nullfunc frames silently, since they are used only to
898 * control station power saving mode. */
899 if (ieee80211_is_nullfunc(hdr->frame_control)) {
900 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
901 /* Update counter and free packet here to avoid counting this
902 * as a dropped packed. */
903 sta->rx_packets++;
904 dev_kfree_skb(rx->skb);
905 return RX_QUEUED;
906 }
907
908 return RX_CONTINUE;
909 } /* ieee80211_rx_h_sta_process */
910
911 static inline struct ieee80211_fragment_entry *
912 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
913 unsigned int frag, unsigned int seq, int rx_queue,
914 struct sk_buff **skb)
915 {
916 struct ieee80211_fragment_entry *entry;
917 int idx;
918
919 idx = sdata->fragment_next;
920 entry = &sdata->fragments[sdata->fragment_next++];
921 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
922 sdata->fragment_next = 0;
923
924 if (!skb_queue_empty(&entry->skb_list)) {
925 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
926 struct ieee80211_hdr *hdr =
927 (struct ieee80211_hdr *) entry->skb_list.next->data;
928 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
929 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
930 "addr1=%pM addr2=%pM\n",
931 sdata->dev->name, idx,
932 jiffies - entry->first_frag_time, entry->seq,
933 entry->last_frag, hdr->addr1, hdr->addr2);
934 #endif
935 __skb_queue_purge(&entry->skb_list);
936 }
937
938 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
939 *skb = NULL;
940 entry->first_frag_time = jiffies;
941 entry->seq = seq;
942 entry->rx_queue = rx_queue;
943 entry->last_frag = frag;
944 entry->ccmp = 0;
945 entry->extra_len = 0;
946
947 return entry;
948 }
949
950 static inline struct ieee80211_fragment_entry *
951 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
952 unsigned int frag, unsigned int seq,
953 int rx_queue, struct ieee80211_hdr *hdr)
954 {
955 struct ieee80211_fragment_entry *entry;
956 int i, idx;
957
958 idx = sdata->fragment_next;
959 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
960 struct ieee80211_hdr *f_hdr;
961
962 idx--;
963 if (idx < 0)
964 idx = IEEE80211_FRAGMENT_MAX - 1;
965
966 entry = &sdata->fragments[idx];
967 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
968 entry->rx_queue != rx_queue ||
969 entry->last_frag + 1 != frag)
970 continue;
971
972 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
973
974 /*
975 * Check ftype and addresses are equal, else check next fragment
976 */
977 if (((hdr->frame_control ^ f_hdr->frame_control) &
978 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
979 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
980 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
981 continue;
982
983 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
984 __skb_queue_purge(&entry->skb_list);
985 continue;
986 }
987 return entry;
988 }
989
990 return NULL;
991 }
992
993 static ieee80211_rx_result debug_noinline
994 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
995 {
996 struct ieee80211_hdr *hdr;
997 u16 sc;
998 __le16 fc;
999 unsigned int frag, seq;
1000 struct ieee80211_fragment_entry *entry;
1001 struct sk_buff *skb;
1002
1003 hdr = (struct ieee80211_hdr *)rx->skb->data;
1004 fc = hdr->frame_control;
1005 sc = le16_to_cpu(hdr->seq_ctrl);
1006 frag = sc & IEEE80211_SCTL_FRAG;
1007
1008 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1009 (rx->skb)->len < 24 ||
1010 is_multicast_ether_addr(hdr->addr1))) {
1011 /* not fragmented */
1012 goto out;
1013 }
1014 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1015
1016 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1017
1018 if (frag == 0) {
1019 /* This is the first fragment of a new frame. */
1020 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1021 rx->queue, &(rx->skb));
1022 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1023 ieee80211_has_protected(fc)) {
1024 /* Store CCMP PN so that we can verify that the next
1025 * fragment has a sequential PN value. */
1026 entry->ccmp = 1;
1027 memcpy(entry->last_pn,
1028 rx->key->u.ccmp.rx_pn[rx->queue],
1029 CCMP_PN_LEN);
1030 }
1031 return RX_QUEUED;
1032 }
1033
1034 /* This is a fragment for a frame that should already be pending in
1035 * fragment cache. Add this fragment to the end of the pending entry.
1036 */
1037 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1038 if (!entry) {
1039 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1040 return RX_DROP_MONITOR;
1041 }
1042
1043 /* Verify that MPDUs within one MSDU have sequential PN values.
1044 * (IEEE 802.11i, 8.3.3.4.5) */
1045 if (entry->ccmp) {
1046 int i;
1047 u8 pn[CCMP_PN_LEN], *rpn;
1048 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1049 return RX_DROP_UNUSABLE;
1050 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1051 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1052 pn[i]++;
1053 if (pn[i])
1054 break;
1055 }
1056 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1057 if (memcmp(pn, rpn, CCMP_PN_LEN))
1058 return RX_DROP_UNUSABLE;
1059 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1060 }
1061
1062 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1063 __skb_queue_tail(&entry->skb_list, rx->skb);
1064 entry->last_frag = frag;
1065 entry->extra_len += rx->skb->len;
1066 if (ieee80211_has_morefrags(fc)) {
1067 rx->skb = NULL;
1068 return RX_QUEUED;
1069 }
1070
1071 rx->skb = __skb_dequeue(&entry->skb_list);
1072 if (skb_tailroom(rx->skb) < entry->extra_len) {
1073 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1074 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1075 GFP_ATOMIC))) {
1076 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1077 __skb_queue_purge(&entry->skb_list);
1078 return RX_DROP_UNUSABLE;
1079 }
1080 }
1081 while ((skb = __skb_dequeue(&entry->skb_list))) {
1082 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1083 dev_kfree_skb(skb);
1084 }
1085
1086 /* Complete frame has been reassembled - process it now */
1087 rx->flags |= IEEE80211_RX_FRAGMENTED;
1088
1089 out:
1090 if (rx->sta)
1091 rx->sta->rx_packets++;
1092 if (is_multicast_ether_addr(hdr->addr1))
1093 rx->local->dot11MulticastReceivedFrameCount++;
1094 else
1095 ieee80211_led_rx(rx->local);
1096 return RX_CONTINUE;
1097 }
1098
1099 static ieee80211_rx_result debug_noinline
1100 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1101 {
1102 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1103 struct sk_buff *skb;
1104 int no_pending_pkts;
1105 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1106
1107 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1108 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1109 return RX_CONTINUE;
1110
1111 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1112 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1113 return RX_DROP_UNUSABLE;
1114
1115 skb = skb_dequeue(&rx->sta->tx_filtered);
1116 if (!skb) {
1117 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1118 if (skb)
1119 rx->local->total_ps_buffered--;
1120 }
1121 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1122 skb_queue_empty(&rx->sta->ps_tx_buf);
1123
1124 if (skb) {
1125 struct ieee80211_hdr *hdr =
1126 (struct ieee80211_hdr *) skb->data;
1127
1128 /*
1129 * Tell TX path to send one frame even though the STA may
1130 * still remain is PS mode after this frame exchange.
1131 */
1132 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1133
1134 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1135 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1136 rx->sta->sta.addr, rx->sta->sta.aid,
1137 skb_queue_len(&rx->sta->ps_tx_buf));
1138 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1139
1140 /* Use MoreData flag to indicate whether there are more
1141 * buffered frames for this STA */
1142 if (no_pending_pkts)
1143 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1144 else
1145 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1146
1147 dev_queue_xmit(skb);
1148
1149 if (no_pending_pkts)
1150 sta_info_clear_tim_bit(rx->sta);
1151 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1152 } else if (!rx->sent_ps_buffered) {
1153 /*
1154 * FIXME: This can be the result of a race condition between
1155 * us expiring a frame and the station polling for it.
1156 * Should we send it a null-func frame indicating we
1157 * have nothing buffered for it?
1158 */
1159 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1160 "though there are no buffered frames for it\n",
1161 rx->dev->name, rx->sta->sta.addr);
1162 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1163 }
1164
1165 /* Free PS Poll skb here instead of returning RX_DROP that would
1166 * count as an dropped frame. */
1167 dev_kfree_skb(rx->skb);
1168
1169 return RX_QUEUED;
1170 }
1171
1172 static ieee80211_rx_result debug_noinline
1173 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1174 {
1175 u8 *data = rx->skb->data;
1176 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1177
1178 if (!ieee80211_is_data_qos(hdr->frame_control))
1179 return RX_CONTINUE;
1180
1181 /* remove the qos control field, update frame type and meta-data */
1182 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1183 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1184 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1185 /* change frame type to non QOS */
1186 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1187
1188 return RX_CONTINUE;
1189 }
1190
1191 static int
1192 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1193 {
1194 if (unlikely(!rx->sta ||
1195 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1196 return -EACCES;
1197
1198 return 0;
1199 }
1200
1201 static int
1202 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1203 {
1204 /*
1205 * Pass through unencrypted frames if the hardware has
1206 * decrypted them already.
1207 */
1208 if (rx->status->flag & RX_FLAG_DECRYPTED)
1209 return 0;
1210
1211 /* Drop unencrypted frames if key is set. */
1212 if (unlikely(!ieee80211_has_protected(fc) &&
1213 !ieee80211_is_nullfunc(fc) &&
1214 ieee80211_is_data(fc) &&
1215 (rx->key || rx->sdata->drop_unencrypted)))
1216 return -EACCES;
1217 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1218 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1219 rx->key))
1220 return -EACCES;
1221 /* BIP does not use Protected field, so need to check MMIE */
1222 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1223 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1224 rx->key))
1225 return -EACCES;
1226 /*
1227 * When using MFP, Action frames are not allowed prior to
1228 * having configured keys.
1229 */
1230 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1231 ieee80211_is_robust_mgmt_frame(
1232 (struct ieee80211_hdr *) rx->skb->data)))
1233 return -EACCES;
1234 }
1235
1236 return 0;
1237 }
1238
1239 static int
1240 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1241 {
1242 struct net_device *dev = rx->dev;
1243 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1244
1245 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1246 }
1247
1248 /*
1249 * requires that rx->skb is a frame with ethernet header
1250 */
1251 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1252 {
1253 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1254 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1255 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1256
1257 /*
1258 * Allow EAPOL frames to us/the PAE group address regardless
1259 * of whether the frame was encrypted or not.
1260 */
1261 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1262 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1263 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1264 return true;
1265
1266 if (ieee80211_802_1x_port_control(rx) ||
1267 ieee80211_drop_unencrypted(rx, fc))
1268 return false;
1269
1270 return true;
1271 }
1272
1273 /*
1274 * requires that rx->skb is a frame with ethernet header
1275 */
1276 static void
1277 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1278 {
1279 struct net_device *dev = rx->dev;
1280 struct ieee80211_local *local = rx->local;
1281 struct sk_buff *skb, *xmit_skb;
1282 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1283 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1284 struct sta_info *dsta;
1285
1286 skb = rx->skb;
1287 xmit_skb = NULL;
1288
1289 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1290 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1291 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1292 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1293 if (is_multicast_ether_addr(ehdr->h_dest)) {
1294 /*
1295 * send multicast frames both to higher layers in
1296 * local net stack and back to the wireless medium
1297 */
1298 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1299 if (!xmit_skb && net_ratelimit())
1300 printk(KERN_DEBUG "%s: failed to clone "
1301 "multicast frame\n", dev->name);
1302 } else {
1303 dsta = sta_info_get(local, skb->data);
1304 if (dsta && dsta->sdata->dev == dev) {
1305 /*
1306 * The destination station is associated to
1307 * this AP (in this VLAN), so send the frame
1308 * directly to it and do not pass it to local
1309 * net stack.
1310 */
1311 xmit_skb = skb;
1312 skb = NULL;
1313 }
1314 }
1315 }
1316
1317 if (skb) {
1318 int align __maybe_unused;
1319
1320 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1321 /*
1322 * 'align' will only take the values 0 or 2 here
1323 * since all frames are required to be aligned
1324 * to 2-byte boundaries when being passed to
1325 * mac80211. That also explains the __skb_push()
1326 * below.
1327 */
1328 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1329 if (align) {
1330 if (WARN_ON(skb_headroom(skb) < 3)) {
1331 dev_kfree_skb(skb);
1332 skb = NULL;
1333 } else {
1334 u8 *data = skb->data;
1335 size_t len = skb->len;
1336 u8 *new = __skb_push(skb, align);
1337 memmove(new, data, len);
1338 __skb_trim(skb, len);
1339 }
1340 }
1341 #endif
1342
1343 if (skb) {
1344 /* deliver to local stack */
1345 skb->protocol = eth_type_trans(skb, dev);
1346 memset(skb->cb, 0, sizeof(skb->cb));
1347 netif_rx(skb);
1348 }
1349 }
1350
1351 if (xmit_skb) {
1352 /* send to wireless media */
1353 xmit_skb->protocol = htons(ETH_P_802_3);
1354 skb_reset_network_header(xmit_skb);
1355 skb_reset_mac_header(xmit_skb);
1356 dev_queue_xmit(xmit_skb);
1357 }
1358 }
1359
1360 static ieee80211_rx_result debug_noinline
1361 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1362 {
1363 struct net_device *dev = rx->dev;
1364 struct ieee80211_local *local = rx->local;
1365 u16 ethertype;
1366 u8 *payload;
1367 struct sk_buff *skb = rx->skb, *frame = NULL;
1368 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1369 __le16 fc = hdr->frame_control;
1370 const struct ethhdr *eth;
1371 int remaining, err;
1372 u8 dst[ETH_ALEN];
1373 u8 src[ETH_ALEN];
1374
1375 if (unlikely(!ieee80211_is_data(fc)))
1376 return RX_CONTINUE;
1377
1378 if (unlikely(!ieee80211_is_data_present(fc)))
1379 return RX_DROP_MONITOR;
1380
1381 if (!(rx->flags & IEEE80211_RX_AMSDU))
1382 return RX_CONTINUE;
1383
1384 err = __ieee80211_data_to_8023(rx);
1385 if (unlikely(err))
1386 return RX_DROP_UNUSABLE;
1387
1388 skb->dev = dev;
1389
1390 dev->stats.rx_packets++;
1391 dev->stats.rx_bytes += skb->len;
1392
1393 /* skip the wrapping header */
1394 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1395 if (!eth)
1396 return RX_DROP_UNUSABLE;
1397
1398 while (skb != frame) {
1399 u8 padding;
1400 __be16 len = eth->h_proto;
1401 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1402
1403 remaining = skb->len;
1404 memcpy(dst, eth->h_dest, ETH_ALEN);
1405 memcpy(src, eth->h_source, ETH_ALEN);
1406
1407 padding = ((4 - subframe_len) & 0x3);
1408 /* the last MSDU has no padding */
1409 if (subframe_len > remaining)
1410 return RX_DROP_UNUSABLE;
1411
1412 skb_pull(skb, sizeof(struct ethhdr));
1413 /* if last subframe reuse skb */
1414 if (remaining <= subframe_len + padding)
1415 frame = skb;
1416 else {
1417 /*
1418 * Allocate and reserve two bytes more for payload
1419 * alignment since sizeof(struct ethhdr) is 14.
1420 */
1421 frame = dev_alloc_skb(
1422 ALIGN(local->hw.extra_tx_headroom, 4) +
1423 subframe_len + 2);
1424
1425 if (frame == NULL)
1426 return RX_DROP_UNUSABLE;
1427
1428 skb_reserve(frame,
1429 ALIGN(local->hw.extra_tx_headroom, 4) +
1430 sizeof(struct ethhdr) + 2);
1431 memcpy(skb_put(frame, ntohs(len)), skb->data,
1432 ntohs(len));
1433
1434 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1435 padding);
1436 if (!eth) {
1437 dev_kfree_skb(frame);
1438 return RX_DROP_UNUSABLE;
1439 }
1440 }
1441
1442 skb_reset_network_header(frame);
1443 frame->dev = dev;
1444 frame->priority = skb->priority;
1445 rx->skb = frame;
1446
1447 payload = frame->data;
1448 ethertype = (payload[6] << 8) | payload[7];
1449
1450 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1451 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1452 compare_ether_addr(payload,
1453 bridge_tunnel_header) == 0)) {
1454 /* remove RFC1042 or Bridge-Tunnel
1455 * encapsulation and replace EtherType */
1456 skb_pull(frame, 6);
1457 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1458 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1459 } else {
1460 memcpy(skb_push(frame, sizeof(__be16)),
1461 &len, sizeof(__be16));
1462 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1463 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1464 }
1465
1466 if (!ieee80211_frame_allowed(rx, fc)) {
1467 if (skb == frame) /* last frame */
1468 return RX_DROP_UNUSABLE;
1469 dev_kfree_skb(frame);
1470 continue;
1471 }
1472
1473 ieee80211_deliver_skb(rx);
1474 }
1475
1476 return RX_QUEUED;
1477 }
1478
1479 #ifdef CONFIG_MAC80211_MESH
1480 static ieee80211_rx_result
1481 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1482 {
1483 struct ieee80211_hdr *hdr;
1484 struct ieee80211s_hdr *mesh_hdr;
1485 unsigned int hdrlen;
1486 struct sk_buff *skb = rx->skb, *fwd_skb;
1487
1488 hdr = (struct ieee80211_hdr *) skb->data;
1489 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1490 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1491
1492 if (!ieee80211_is_data(hdr->frame_control))
1493 return RX_CONTINUE;
1494
1495 if (!mesh_hdr->ttl)
1496 /* illegal frame */
1497 return RX_DROP_MONITOR;
1498
1499 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1500 struct ieee80211_sub_if_data *sdata;
1501 struct mesh_path *mppath;
1502
1503 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1504 rcu_read_lock();
1505 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1506 if (!mppath) {
1507 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1508 } else {
1509 spin_lock_bh(&mppath->state_lock);
1510 mppath->exp_time = jiffies;
1511 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1512 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1513 spin_unlock_bh(&mppath->state_lock);
1514 }
1515 rcu_read_unlock();
1516 }
1517
1518 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1519 return RX_CONTINUE;
1520
1521 mesh_hdr->ttl--;
1522
1523 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1524 if (!mesh_hdr->ttl)
1525 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1526 dropped_frames_ttl);
1527 else {
1528 struct ieee80211_hdr *fwd_hdr;
1529 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1530
1531 if (!fwd_skb && net_ratelimit())
1532 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1533 rx->dev->name);
1534
1535 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1536 /*
1537 * Save TA to addr1 to send TA a path error if a
1538 * suitable next hop is not found
1539 */
1540 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1541 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1542 fwd_skb->dev = rx->local->mdev;
1543 fwd_skb->iif = rx->dev->ifindex;
1544 dev_queue_xmit(fwd_skb);
1545 }
1546 }
1547
1548 if (is_multicast_ether_addr(hdr->addr3) ||
1549 rx->dev->flags & IFF_PROMISC)
1550 return RX_CONTINUE;
1551 else
1552 return RX_DROP_MONITOR;
1553 }
1554 #endif
1555
1556 static ieee80211_rx_result debug_noinline
1557 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
1558 {
1559 struct net_device *dev = rx->dev;
1560 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1561 __le16 fc = hdr->frame_control;
1562 int err;
1563
1564 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
1565 return RX_CONTINUE;
1566
1567 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
1568 return RX_DROP_MONITOR;
1569
1570 err = __ieee80211_data_to_8023(rx);
1571 if (unlikely(err))
1572 return RX_DROP_UNUSABLE;
1573
1574 if (!ieee80211_frame_allowed(rx, fc))
1575 return RX_DROP_MONITOR;
1576
1577 rx->skb->dev = dev;
1578
1579 dev->stats.rx_packets++;
1580 dev->stats.rx_bytes += rx->skb->len;
1581
1582 ieee80211_deliver_skb(rx);
1583
1584 return RX_QUEUED;
1585 }
1586
1587 static ieee80211_rx_result debug_noinline
1588 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
1589 {
1590 struct ieee80211_local *local = rx->local;
1591 struct ieee80211_hw *hw = &local->hw;
1592 struct sk_buff *skb = rx->skb;
1593 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
1594 struct tid_ampdu_rx *tid_agg_rx;
1595 u16 start_seq_num;
1596 u16 tid;
1597
1598 if (likely(!ieee80211_is_ctl(bar->frame_control)))
1599 return RX_CONTINUE;
1600
1601 if (ieee80211_is_back_req(bar->frame_control)) {
1602 if (!rx->sta)
1603 return RX_CONTINUE;
1604 tid = le16_to_cpu(bar->control) >> 12;
1605 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1606 != HT_AGG_STATE_OPERATIONAL)
1607 return RX_CONTINUE;
1608 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
1609
1610 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1611
1612 /* reset session timer */
1613 if (tid_agg_rx->timeout)
1614 mod_timer(&tid_agg_rx->session_timer,
1615 TU_TO_EXP_TIME(tid_agg_rx->timeout));
1616
1617 /* manage reordering buffer according to requested */
1618 /* sequence number */
1619 rcu_read_lock();
1620 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1621 start_seq_num, 1);
1622 rcu_read_unlock();
1623 return RX_DROP_UNUSABLE;
1624 }
1625
1626 return RX_CONTINUE;
1627 }
1628
1629 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1630 struct ieee80211_mgmt *mgmt,
1631 size_t len)
1632 {
1633 struct ieee80211_local *local = sdata->local;
1634 struct sk_buff *skb;
1635 struct ieee80211_mgmt *resp;
1636
1637 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1638 /* Not to own unicast address */
1639 return;
1640 }
1641
1642 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1643 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
1644 /* Not from the current AP. */
1645 return;
1646 }
1647
1648 if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) {
1649 /* Association in progress; ignore SA Query */
1650 return;
1651 }
1652
1653 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1654 /* Too short SA Query request frame */
1655 return;
1656 }
1657
1658 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1659 if (skb == NULL)
1660 return;
1661
1662 skb_reserve(skb, local->hw.extra_tx_headroom);
1663 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1664 memset(resp, 0, 24);
1665 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1666 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1667 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1668 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1669 IEEE80211_STYPE_ACTION);
1670 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1671 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1672 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1673 memcpy(resp->u.action.u.sa_query.trans_id,
1674 mgmt->u.action.u.sa_query.trans_id,
1675 WLAN_SA_QUERY_TR_ID_LEN);
1676
1677 ieee80211_tx_skb(sdata, skb, 1);
1678 }
1679
1680 static ieee80211_rx_result debug_noinline
1681 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1682 {
1683 struct ieee80211_local *local = rx->local;
1684 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1685 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1686 struct ieee80211_bss *bss;
1687 int len = rx->skb->len;
1688
1689 if (!ieee80211_is_action(mgmt->frame_control))
1690 return RX_CONTINUE;
1691
1692 if (!rx->sta)
1693 return RX_DROP_MONITOR;
1694
1695 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1696 return RX_DROP_MONITOR;
1697
1698 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1699 return RX_DROP_MONITOR;
1700
1701 /* all categories we currently handle have action_code */
1702 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1703 return RX_DROP_MONITOR;
1704
1705 switch (mgmt->u.action.category) {
1706 case WLAN_CATEGORY_BACK:
1707 /*
1708 * The aggregation code is not prepared to handle
1709 * anything but STA/AP due to the BSSID handling;
1710 * IBSS could work in the code but isn't supported
1711 * by drivers or the standard.
1712 */
1713 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1714 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1715 sdata->vif.type != NL80211_IFTYPE_AP)
1716 return RX_DROP_MONITOR;
1717
1718 switch (mgmt->u.action.u.addba_req.action_code) {
1719 case WLAN_ACTION_ADDBA_REQ:
1720 if (len < (IEEE80211_MIN_ACTION_SIZE +
1721 sizeof(mgmt->u.action.u.addba_req)))
1722 return RX_DROP_MONITOR;
1723 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1724 break;
1725 case WLAN_ACTION_ADDBA_RESP:
1726 if (len < (IEEE80211_MIN_ACTION_SIZE +
1727 sizeof(mgmt->u.action.u.addba_resp)))
1728 return RX_DROP_MONITOR;
1729 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1730 break;
1731 case WLAN_ACTION_DELBA:
1732 if (len < (IEEE80211_MIN_ACTION_SIZE +
1733 sizeof(mgmt->u.action.u.delba)))
1734 return RX_DROP_MONITOR;
1735 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1736 break;
1737 }
1738 break;
1739 case WLAN_CATEGORY_SPECTRUM_MGMT:
1740 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1741 return RX_DROP_MONITOR;
1742
1743 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1744 return RX_DROP_MONITOR;
1745
1746 switch (mgmt->u.action.u.measurement.action_code) {
1747 case WLAN_ACTION_SPCT_MSR_REQ:
1748 if (len < (IEEE80211_MIN_ACTION_SIZE +
1749 sizeof(mgmt->u.action.u.measurement)))
1750 return RX_DROP_MONITOR;
1751 ieee80211_process_measurement_req(sdata, mgmt, len);
1752 break;
1753 case WLAN_ACTION_SPCT_CHL_SWITCH:
1754 if (len < (IEEE80211_MIN_ACTION_SIZE +
1755 sizeof(mgmt->u.action.u.chan_switch)))
1756 return RX_DROP_MONITOR;
1757
1758 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1759 return RX_DROP_MONITOR;
1760
1761 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1762 return RX_DROP_MONITOR;
1763
1764 bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid,
1765 local->hw.conf.channel->center_freq,
1766 sdata->u.mgd.ssid,
1767 sdata->u.mgd.ssid_len);
1768 if (!bss)
1769 return RX_DROP_MONITOR;
1770
1771 ieee80211_sta_process_chanswitch(sdata,
1772 &mgmt->u.action.u.chan_switch.sw_elem, bss);
1773 ieee80211_rx_bss_put(local, bss);
1774 break;
1775 }
1776 break;
1777 case WLAN_CATEGORY_SA_QUERY:
1778 if (len < (IEEE80211_MIN_ACTION_SIZE +
1779 sizeof(mgmt->u.action.u.sa_query)))
1780 return RX_DROP_MONITOR;
1781 switch (mgmt->u.action.u.sa_query.action) {
1782 case WLAN_ACTION_SA_QUERY_REQUEST:
1783 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1784 return RX_DROP_MONITOR;
1785 ieee80211_process_sa_query_req(sdata, mgmt, len);
1786 break;
1787 case WLAN_ACTION_SA_QUERY_RESPONSE:
1788 /*
1789 * SA Query response is currently only used in AP mode
1790 * and it is processed in user space.
1791 */
1792 return RX_CONTINUE;
1793 }
1794 break;
1795 default:
1796 return RX_CONTINUE;
1797 }
1798
1799 rx->sta->rx_packets++;
1800 dev_kfree_skb(rx->skb);
1801 return RX_QUEUED;
1802 }
1803
1804 static ieee80211_rx_result debug_noinline
1805 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1806 {
1807 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1808 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1809
1810 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1811 return RX_DROP_MONITOR;
1812
1813 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1814 return RX_DROP_MONITOR;
1815
1816 if (ieee80211_vif_is_mesh(&sdata->vif))
1817 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1818
1819 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1820 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1821
1822 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1823 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1824
1825 return RX_DROP_MONITOR;
1826 }
1827
1828 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1829 struct ieee80211_hdr *hdr,
1830 struct ieee80211_rx_data *rx)
1831 {
1832 int keyidx;
1833 unsigned int hdrlen;
1834
1835 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1836 if (rx->skb->len >= hdrlen + 4)
1837 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1838 else
1839 keyidx = -1;
1840
1841 if (!rx->sta) {
1842 /*
1843 * Some hardware seem to generate incorrect Michael MIC
1844 * reports; ignore them to avoid triggering countermeasures.
1845 */
1846 goto ignore;
1847 }
1848
1849 if (!ieee80211_has_protected(hdr->frame_control))
1850 goto ignore;
1851
1852 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1853 /*
1854 * APs with pairwise keys should never receive Michael MIC
1855 * errors for non-zero keyidx because these are reserved for
1856 * group keys and only the AP is sending real multicast
1857 * frames in the BSS.
1858 */
1859 goto ignore;
1860 }
1861
1862 if (!ieee80211_is_data(hdr->frame_control) &&
1863 !ieee80211_is_auth(hdr->frame_control))
1864 goto ignore;
1865
1866 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1867 GFP_ATOMIC);
1868 ignore:
1869 dev_kfree_skb(rx->skb);
1870 rx->skb = NULL;
1871 }
1872
1873 /* TODO: use IEEE80211_RX_FRAGMENTED */
1874 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1875 {
1876 struct ieee80211_sub_if_data *sdata;
1877 struct ieee80211_local *local = rx->local;
1878 struct ieee80211_rtap_hdr {
1879 struct ieee80211_radiotap_header hdr;
1880 u8 flags;
1881 u8 rate;
1882 __le16 chan_freq;
1883 __le16 chan_flags;
1884 } __attribute__ ((packed)) *rthdr;
1885 struct sk_buff *skb = rx->skb, *skb2;
1886 struct net_device *prev_dev = NULL;
1887 struct ieee80211_rx_status *status = rx->status;
1888
1889 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1890 goto out_free_skb;
1891
1892 if (skb_headroom(skb) < sizeof(*rthdr) &&
1893 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1894 goto out_free_skb;
1895
1896 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1897 memset(rthdr, 0, sizeof(*rthdr));
1898 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1899 rthdr->hdr.it_present =
1900 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1901 (1 << IEEE80211_RADIOTAP_RATE) |
1902 (1 << IEEE80211_RADIOTAP_CHANNEL));
1903
1904 rthdr->rate = rx->rate->bitrate / 5;
1905 rthdr->chan_freq = cpu_to_le16(status->freq);
1906
1907 if (status->band == IEEE80211_BAND_5GHZ)
1908 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1909 IEEE80211_CHAN_5GHZ);
1910 else
1911 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1912 IEEE80211_CHAN_2GHZ);
1913
1914 skb_set_mac_header(skb, 0);
1915 skb->ip_summed = CHECKSUM_UNNECESSARY;
1916 skb->pkt_type = PACKET_OTHERHOST;
1917 skb->protocol = htons(ETH_P_802_2);
1918
1919 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1920 if (!netif_running(sdata->dev))
1921 continue;
1922
1923 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1924 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1925 continue;
1926
1927 if (prev_dev) {
1928 skb2 = skb_clone(skb, GFP_ATOMIC);
1929 if (skb2) {
1930 skb2->dev = prev_dev;
1931 netif_rx(skb2);
1932 }
1933 }
1934
1935 prev_dev = sdata->dev;
1936 sdata->dev->stats.rx_packets++;
1937 sdata->dev->stats.rx_bytes += skb->len;
1938 }
1939
1940 if (prev_dev) {
1941 skb->dev = prev_dev;
1942 netif_rx(skb);
1943 skb = NULL;
1944 } else
1945 goto out_free_skb;
1946
1947 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1948 return;
1949
1950 out_free_skb:
1951 dev_kfree_skb(skb);
1952 }
1953
1954
1955 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1956 struct ieee80211_rx_data *rx,
1957 struct sk_buff *skb)
1958 {
1959 ieee80211_rx_result res = RX_DROP_MONITOR;
1960
1961 rx->skb = skb;
1962 rx->sdata = sdata;
1963 rx->dev = sdata->dev;
1964
1965 #define CALL_RXH(rxh) \
1966 do { \
1967 res = rxh(rx); \
1968 if (res != RX_CONTINUE) \
1969 goto rxh_done; \
1970 } while (0);
1971
1972 CALL_RXH(ieee80211_rx_h_passive_scan)
1973 CALL_RXH(ieee80211_rx_h_check)
1974 CALL_RXH(ieee80211_rx_h_decrypt)
1975 CALL_RXH(ieee80211_rx_h_check_more_data)
1976 CALL_RXH(ieee80211_rx_h_sta_process)
1977 CALL_RXH(ieee80211_rx_h_defragment)
1978 CALL_RXH(ieee80211_rx_h_ps_poll)
1979 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1980 /* must be after MMIC verify so header is counted in MPDU mic */
1981 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1982 CALL_RXH(ieee80211_rx_h_amsdu)
1983 #ifdef CONFIG_MAC80211_MESH
1984 if (ieee80211_vif_is_mesh(&sdata->vif))
1985 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1986 #endif
1987 CALL_RXH(ieee80211_rx_h_data)
1988 CALL_RXH(ieee80211_rx_h_ctrl)
1989 CALL_RXH(ieee80211_rx_h_action)
1990 CALL_RXH(ieee80211_rx_h_mgmt)
1991
1992 #undef CALL_RXH
1993
1994 rxh_done:
1995 switch (res) {
1996 case RX_DROP_MONITOR:
1997 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1998 if (rx->sta)
1999 rx->sta->rx_dropped++;
2000 /* fall through */
2001 case RX_CONTINUE:
2002 ieee80211_rx_cooked_monitor(rx);
2003 break;
2004 case RX_DROP_UNUSABLE:
2005 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
2006 if (rx->sta)
2007 rx->sta->rx_dropped++;
2008 dev_kfree_skb(rx->skb);
2009 break;
2010 case RX_QUEUED:
2011 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
2012 break;
2013 }
2014 }
2015
2016 /* main receive path */
2017
2018 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2019 struct ieee80211_rx_data *rx,
2020 struct ieee80211_hdr *hdr)
2021 {
2022 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2023 int multicast = is_multicast_ether_addr(hdr->addr1);
2024
2025 switch (sdata->vif.type) {
2026 case NL80211_IFTYPE_STATION:
2027 if (!bssid)
2028 return 0;
2029 if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) {
2030 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2031 return 0;
2032 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2033 } else if (!multicast &&
2034 compare_ether_addr(sdata->dev->dev_addr,
2035 hdr->addr1) != 0) {
2036 if (!(sdata->dev->flags & IFF_PROMISC))
2037 return 0;
2038 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2039 }
2040 break;
2041 case NL80211_IFTYPE_ADHOC:
2042 if (!bssid)
2043 return 0;
2044 if (ieee80211_is_beacon(hdr->frame_control)) {
2045 return 1;
2046 }
2047 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2048 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2049 return 0;
2050 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2051 } else if (!multicast &&
2052 compare_ether_addr(sdata->dev->dev_addr,
2053 hdr->addr1) != 0) {
2054 if (!(sdata->dev->flags & IFF_PROMISC))
2055 return 0;
2056 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2057 } else if (!rx->sta) {
2058 int rate_idx;
2059 if (rx->status->flag & RX_FLAG_HT)
2060 rate_idx = 0; /* TODO: HT rates */
2061 else
2062 rate_idx = rx->status->rate_idx;
2063 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2064 BIT(rate_idx));
2065 }
2066 break;
2067 case NL80211_IFTYPE_MESH_POINT:
2068 if (!multicast &&
2069 compare_ether_addr(sdata->dev->dev_addr,
2070 hdr->addr1) != 0) {
2071 if (!(sdata->dev->flags & IFF_PROMISC))
2072 return 0;
2073
2074 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2075 }
2076 break;
2077 case NL80211_IFTYPE_AP_VLAN:
2078 case NL80211_IFTYPE_AP:
2079 if (!bssid) {
2080 if (compare_ether_addr(sdata->dev->dev_addr,
2081 hdr->addr1))
2082 return 0;
2083 } else if (!ieee80211_bssid_match(bssid,
2084 sdata->dev->dev_addr)) {
2085 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2086 return 0;
2087 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2088 }
2089 break;
2090 case NL80211_IFTYPE_WDS:
2091 if (bssid || !ieee80211_is_data(hdr->frame_control))
2092 return 0;
2093 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2094 return 0;
2095 break;
2096 case NL80211_IFTYPE_MONITOR:
2097 /* take everything */
2098 break;
2099 case NL80211_IFTYPE_UNSPECIFIED:
2100 case __NL80211_IFTYPE_AFTER_LAST:
2101 /* should never get here */
2102 WARN_ON(1);
2103 break;
2104 }
2105
2106 return 1;
2107 }
2108
2109 /*
2110 * This is the actual Rx frames handler. as it blongs to Rx path it must
2111 * be called with rcu_read_lock protection.
2112 */
2113 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2114 struct sk_buff *skb,
2115 struct ieee80211_rate *rate)
2116 {
2117 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2118 struct ieee80211_local *local = hw_to_local(hw);
2119 struct ieee80211_sub_if_data *sdata;
2120 struct ieee80211_hdr *hdr;
2121 struct ieee80211_rx_data rx;
2122 int prepares;
2123 struct ieee80211_sub_if_data *prev = NULL;
2124 struct sk_buff *skb_new;
2125
2126 hdr = (struct ieee80211_hdr *)skb->data;
2127 memset(&rx, 0, sizeof(rx));
2128 rx.skb = skb;
2129 rx.local = local;
2130
2131 rx.status = status;
2132 rx.rate = rate;
2133
2134 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2135 local->dot11ReceivedFragmentCount++;
2136
2137 rx.sta = sta_info_get(local, hdr->addr2);
2138 if (rx.sta) {
2139 rx.sdata = rx.sta->sdata;
2140 rx.dev = rx.sta->sdata->dev;
2141 }
2142
2143 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2144 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
2145 return;
2146 }
2147
2148 if (unlikely(local->sw_scanning || local->hw_scanning))
2149 rx.flags |= IEEE80211_RX_IN_SCAN;
2150
2151 ieee80211_parse_qos(&rx);
2152 ieee80211_verify_alignment(&rx);
2153
2154 skb = rx.skb;
2155
2156 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2157 if (!netif_running(sdata->dev))
2158 continue;
2159
2160 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2161 continue;
2162
2163 rx.flags |= IEEE80211_RX_RA_MATCH;
2164 prepares = prepare_for_handlers(sdata, &rx, hdr);
2165
2166 if (!prepares)
2167 continue;
2168
2169 /*
2170 * frame is destined for this interface, but if it's not
2171 * also for the previous one we handle that after the
2172 * loop to avoid copying the SKB once too much
2173 */
2174
2175 if (!prev) {
2176 prev = sdata;
2177 continue;
2178 }
2179
2180 /*
2181 * frame was destined for the previous interface
2182 * so invoke RX handlers for it
2183 */
2184
2185 skb_new = skb_copy(skb, GFP_ATOMIC);
2186 if (!skb_new) {
2187 if (net_ratelimit())
2188 printk(KERN_DEBUG "%s: failed to copy "
2189 "multicast frame for %s\n",
2190 wiphy_name(local->hw.wiphy),
2191 prev->dev->name);
2192 continue;
2193 }
2194 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2195 prev = sdata;
2196 }
2197 if (prev)
2198 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2199 else
2200 dev_kfree_skb(skb);
2201 }
2202
2203 #define SEQ_MODULO 0x1000
2204 #define SEQ_MASK 0xfff
2205
2206 static inline int seq_less(u16 sq1, u16 sq2)
2207 {
2208 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2209 }
2210
2211 static inline u16 seq_inc(u16 sq)
2212 {
2213 return (sq + 1) & SEQ_MASK;
2214 }
2215
2216 static inline u16 seq_sub(u16 sq1, u16 sq2)
2217 {
2218 return (sq1 - sq2) & SEQ_MASK;
2219 }
2220
2221
2222 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2223 struct tid_ampdu_rx *tid_agg_rx,
2224 int index)
2225 {
2226 struct ieee80211_supported_band *sband;
2227 struct ieee80211_rate *rate;
2228 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2229 struct ieee80211_rx_status *status;
2230
2231 if (!skb)
2232 goto no_frame;
2233
2234 status = IEEE80211_SKB_RXCB(skb);
2235
2236 /* release the reordered frames to stack */
2237 sband = hw->wiphy->bands[status->band];
2238 if (status->flag & RX_FLAG_HT)
2239 rate = sband->bitrates; /* TODO: HT rates */
2240 else
2241 rate = &sband->bitrates[status->rate_idx];
2242 __ieee80211_rx_handle_packet(hw, skb, rate);
2243 tid_agg_rx->stored_mpdu_num--;
2244 tid_agg_rx->reorder_buf[index] = NULL;
2245
2246 no_frame:
2247 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2248 }
2249
2250
2251 /*
2252 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2253 * the skb was added to the buffer longer than this time ago, the earlier
2254 * frames that have not yet been received are assumed to be lost and the skb
2255 * can be released for processing. This may also release other skb's from the
2256 * reorder buffer if there are no additional gaps between the frames.
2257 */
2258 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2259
2260 /*
2261 * As it function blongs to Rx path it must be called with
2262 * the proper rcu_read_lock protection for its flow.
2263 */
2264 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2265 struct tid_ampdu_rx *tid_agg_rx,
2266 struct sk_buff *skb,
2267 u16 mpdu_seq_num,
2268 int bar_req)
2269 {
2270 u16 head_seq_num, buf_size;
2271 int index;
2272
2273 buf_size = tid_agg_rx->buf_size;
2274 head_seq_num = tid_agg_rx->head_seq_num;
2275
2276 /* frame with out of date sequence number */
2277 if (seq_less(mpdu_seq_num, head_seq_num)) {
2278 dev_kfree_skb(skb);
2279 return 1;
2280 }
2281
2282 /* if frame sequence number exceeds our buffering window size or
2283 * block Ack Request arrived - release stored frames */
2284 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2285 /* new head to the ordering buffer */
2286 if (bar_req)
2287 head_seq_num = mpdu_seq_num;
2288 else
2289 head_seq_num =
2290 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2291 /* release stored frames up to new head to stack */
2292 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2293 index = seq_sub(tid_agg_rx->head_seq_num,
2294 tid_agg_rx->ssn)
2295 % tid_agg_rx->buf_size;
2296 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2297 index);
2298 }
2299 if (bar_req)
2300 return 1;
2301 }
2302
2303 /* now the new frame is always in the range of the reordering */
2304 /* buffer window */
2305 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2306 % tid_agg_rx->buf_size;
2307 /* check if we already stored this frame */
2308 if (tid_agg_rx->reorder_buf[index]) {
2309 dev_kfree_skb(skb);
2310 return 1;
2311 }
2312
2313 /* if arrived mpdu is in the right order and nothing else stored */
2314 /* release it immediately */
2315 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2316 tid_agg_rx->stored_mpdu_num == 0) {
2317 tid_agg_rx->head_seq_num =
2318 seq_inc(tid_agg_rx->head_seq_num);
2319 return 0;
2320 }
2321
2322 /* put the frame in the reordering buffer */
2323 tid_agg_rx->reorder_buf[index] = skb;
2324 tid_agg_rx->reorder_time[index] = jiffies;
2325 tid_agg_rx->stored_mpdu_num++;
2326 /* release the buffer until next missing frame */
2327 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2328 % tid_agg_rx->buf_size;
2329 if (!tid_agg_rx->reorder_buf[index] &&
2330 tid_agg_rx->stored_mpdu_num > 1) {
2331 /*
2332 * No buffers ready to be released, but check whether any
2333 * frames in the reorder buffer have timed out.
2334 */
2335 int j;
2336 int skipped = 1;
2337 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2338 j = (j + 1) % tid_agg_rx->buf_size) {
2339 if (tid_agg_rx->reorder_buf[j] == NULL) {
2340 skipped++;
2341 continue;
2342 }
2343 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2344 HZ / 10))
2345 break;
2346
2347 #ifdef CONFIG_MAC80211_HT_DEBUG
2348 if (net_ratelimit())
2349 printk(KERN_DEBUG "%s: release an RX reorder "
2350 "frame due to timeout on earlier "
2351 "frames\n",
2352 wiphy_name(hw->wiphy));
2353 #endif
2354 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2355
2356 /*
2357 * Increment the head seq# also for the skipped slots.
2358 */
2359 tid_agg_rx->head_seq_num =
2360 (tid_agg_rx->head_seq_num + skipped) &
2361 SEQ_MASK;
2362 skipped = 0;
2363 }
2364 } else while (tid_agg_rx->reorder_buf[index]) {
2365 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2366 index = seq_sub(tid_agg_rx->head_seq_num,
2367 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2368 }
2369 return 1;
2370 }
2371
2372 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2373 struct sk_buff *skb)
2374 {
2375 struct ieee80211_hw *hw = &local->hw;
2376 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2377 struct sta_info *sta;
2378 struct tid_ampdu_rx *tid_agg_rx;
2379 u16 sc;
2380 u16 mpdu_seq_num;
2381 u8 ret = 0;
2382 int tid;
2383
2384 sta = sta_info_get(local, hdr->addr2);
2385 if (!sta)
2386 return ret;
2387
2388 /* filter the QoS data rx stream according to
2389 * STA/TID and check if this STA/TID is on aggregation */
2390 if (!ieee80211_is_data_qos(hdr->frame_control))
2391 goto end_reorder;
2392
2393 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2394
2395 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2396 goto end_reorder;
2397
2398 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2399
2400 /* qos null data frames are excluded */
2401 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2402 goto end_reorder;
2403
2404 /* new un-ordered ampdu frame - process it */
2405
2406 /* reset session timer */
2407 if (tid_agg_rx->timeout)
2408 mod_timer(&tid_agg_rx->session_timer,
2409 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2410
2411 /* if this mpdu is fragmented - terminate rx aggregation session */
2412 sc = le16_to_cpu(hdr->seq_ctrl);
2413 if (sc & IEEE80211_SCTL_FRAG) {
2414 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2415 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2416 ret = 1;
2417 goto end_reorder;
2418 }
2419
2420 /* according to mpdu sequence number deal with reordering buffer */
2421 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2422 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2423 mpdu_seq_num, 0);
2424 end_reorder:
2425 return ret;
2426 }
2427
2428 /*
2429 * This is the receive path handler. It is called by a low level driver when an
2430 * 802.11 MPDU is received from the hardware.
2431 */
2432 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2433 {
2434 struct ieee80211_local *local = hw_to_local(hw);
2435 struct ieee80211_rate *rate = NULL;
2436 struct ieee80211_supported_band *sband;
2437 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2438
2439 if (status->band < 0 ||
2440 status->band >= IEEE80211_NUM_BANDS) {
2441 WARN_ON(1);
2442 return;
2443 }
2444
2445 sband = local->hw.wiphy->bands[status->band];
2446 if (!sband) {
2447 WARN_ON(1);
2448 return;
2449 }
2450
2451 if (status->flag & RX_FLAG_HT) {
2452 /* rate_idx is MCS index */
2453 if (WARN_ON(status->rate_idx < 0 ||
2454 status->rate_idx >= 76))
2455 return;
2456 /* HT rates are not in the table - use the highest legacy rate
2457 * for now since other parts of mac80211 may not yet be fully
2458 * MCS aware. */
2459 rate = &sband->bitrates[sband->n_bitrates - 1];
2460 } else {
2461 if (WARN_ON(status->rate_idx < 0 ||
2462 status->rate_idx >= sband->n_bitrates))
2463 return;
2464 rate = &sband->bitrates[status->rate_idx];
2465 }
2466
2467 /*
2468 * key references and virtual interfaces are protected using RCU
2469 * and this requires that we are in a read-side RCU section during
2470 * receive processing
2471 */
2472 rcu_read_lock();
2473
2474 /*
2475 * Frames with failed FCS/PLCP checksum are not returned,
2476 * all other frames are returned without radiotap header
2477 * if it was previously present.
2478 * Also, frames with less than 16 bytes are dropped.
2479 */
2480 skb = ieee80211_rx_monitor(local, skb, rate);
2481 if (!skb) {
2482 rcu_read_unlock();
2483 return;
2484 }
2485
2486 /*
2487 * In theory, the block ack reordering should happen after duplicate
2488 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2489 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2490 * happen as a new RX handler between ieee80211_rx_h_check and
2491 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2492 * the time being, the call can be here since RX reorder buf processing
2493 * will implicitly skip duplicates. We could, in theory at least,
2494 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2495 * frames from other than operational channel), but that should not
2496 * happen in normal networks.
2497 */
2498 if (!ieee80211_rx_reorder_ampdu(local, skb))
2499 __ieee80211_rx_handle_packet(hw, skb, rate);
2500
2501 rcu_read_unlock();
2502 }
2503 EXPORT_SYMBOL(__ieee80211_rx);
2504
2505 /* This is a version of the rx handler that can be called from hard irq
2506 * context. Post the skb on the queue and schedule the tasklet */
2507 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2508 {
2509 struct ieee80211_local *local = hw_to_local(hw);
2510
2511 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2512
2513 skb->dev = local->mdev;
2514 skb->pkt_type = IEEE80211_RX_MSG;
2515 skb_queue_tail(&local->skb_queue, skb);
2516 tasklet_schedule(&local->tasklet);
2517 }
2518 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
kernel source for telekom puls (alcatel/mediatek)