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1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/jiffies.h>
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rcupdate.h>
18 #include <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20
21 #include "ieee80211_i.h"
22 #include "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 /*
837 * Update last_rx only for IBSS packets which are for the current
838 * BSSID to avoid keeping the current IBSS network alive in cases
839 * where other STAs start using different BSSID.
840 */
841 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
842 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
843 NL80211_IFTYPE_ADHOC);
844 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
845 sta->last_rx = jiffies;
846 } else if (!is_multicast_ether_addr(hdr->addr1)) {
847 /*
848 * Mesh beacons will update last_rx when if they are found to
849 * match the current local configuration when processed.
850 */
851 sta->last_rx = jiffies;
852 }
853
854 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
855 return RX_CONTINUE;
856
857 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
858 ieee80211_sta_rx_notify(rx->sdata, hdr);
859
860 sta->rx_fragments++;
861 sta->rx_bytes += rx->skb->len;
862 sta->last_signal = rx->status->signal;
863 sta->last_qual = rx->status->qual;
864 sta->last_noise = rx->status->noise;
865
866 /*
867 * Change STA power saving mode only at the end of a frame
868 * exchange sequence.
869 */
870 if (!ieee80211_has_morefrags(hdr->frame_control) &&
871 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
872 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
873 if (test_sta_flags(sta, WLAN_STA_PS)) {
874 /*
875 * Ignore doze->wake transitions that are
876 * indicated by non-data frames, the standard
877 * is unclear here, but for example going to
878 * PS mode and then scanning would cause a
879 * doze->wake transition for the probe request,
880 * and that is clearly undesirable.
881 */
882 if (ieee80211_is_data(hdr->frame_control) &&
883 !ieee80211_has_pm(hdr->frame_control))
884 rx->sent_ps_buffered += ap_sta_ps_end(sta);
885 } else {
886 if (ieee80211_has_pm(hdr->frame_control))
887 ap_sta_ps_start(sta);
888 }
889 }
890
891 /* Drop data::nullfunc frames silently, since they are used only to
892 * control station power saving mode. */
893 if (ieee80211_is_nullfunc(hdr->frame_control)) {
894 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
895 /* Update counter and free packet here to avoid counting this
896 * as a dropped packed. */
897 sta->rx_packets++;
898 dev_kfree_skb(rx->skb);
899 return RX_QUEUED;
900 }
901
902 return RX_CONTINUE;
903 } /* ieee80211_rx_h_sta_process */
904
905 static inline struct ieee80211_fragment_entry *
906 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
907 unsigned int frag, unsigned int seq, int rx_queue,
908 struct sk_buff **skb)
909 {
910 struct ieee80211_fragment_entry *entry;
911 int idx;
912
913 idx = sdata->fragment_next;
914 entry = &sdata->fragments[sdata->fragment_next++];
915 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
916 sdata->fragment_next = 0;
917
918 if (!skb_queue_empty(&entry->skb_list)) {
919 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
920 struct ieee80211_hdr *hdr =
921 (struct ieee80211_hdr *) entry->skb_list.next->data;
922 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
923 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
924 "addr1=%pM addr2=%pM\n",
925 sdata->dev->name, idx,
926 jiffies - entry->first_frag_time, entry->seq,
927 entry->last_frag, hdr->addr1, hdr->addr2);
928 #endif
929 __skb_queue_purge(&entry->skb_list);
930 }
931
932 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
933 *skb = NULL;
934 entry->first_frag_time = jiffies;
935 entry->seq = seq;
936 entry->rx_queue = rx_queue;
937 entry->last_frag = frag;
938 entry->ccmp = 0;
939 entry->extra_len = 0;
940
941 return entry;
942 }
943
944 static inline struct ieee80211_fragment_entry *
945 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
946 unsigned int frag, unsigned int seq,
947 int rx_queue, struct ieee80211_hdr *hdr)
948 {
949 struct ieee80211_fragment_entry *entry;
950 int i, idx;
951
952 idx = sdata->fragment_next;
953 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
954 struct ieee80211_hdr *f_hdr;
955
956 idx--;
957 if (idx < 0)
958 idx = IEEE80211_FRAGMENT_MAX - 1;
959
960 entry = &sdata->fragments[idx];
961 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
962 entry->rx_queue != rx_queue ||
963 entry->last_frag + 1 != frag)
964 continue;
965
966 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
967
968 /*
969 * Check ftype and addresses are equal, else check next fragment
970 */
971 if (((hdr->frame_control ^ f_hdr->frame_control) &
972 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
973 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
974 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
975 continue;
976
977 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
978 __skb_queue_purge(&entry->skb_list);
979 continue;
980 }
981 return entry;
982 }
983
984 return NULL;
985 }
986
987 static ieee80211_rx_result debug_noinline
988 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
989 {
990 struct ieee80211_hdr *hdr;
991 u16 sc;
992 __le16 fc;
993 unsigned int frag, seq;
994 struct ieee80211_fragment_entry *entry;
995 struct sk_buff *skb;
996
997 hdr = (struct ieee80211_hdr *)rx->skb->data;
998 fc = hdr->frame_control;
999 sc = le16_to_cpu(hdr->seq_ctrl);
1000 frag = sc & IEEE80211_SCTL_FRAG;
1001
1002 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
1003 (rx->skb)->len < 24 ||
1004 is_multicast_ether_addr(hdr->addr1))) {
1005 /* not fragmented */
1006 goto out;
1007 }
1008 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1009
1010 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1011
1012 if (frag == 0) {
1013 /* This is the first fragment of a new frame. */
1014 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1015 rx->queue, &(rx->skb));
1016 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
1017 ieee80211_has_protected(fc)) {
1018 /* Store CCMP PN so that we can verify that the next
1019 * fragment has a sequential PN value. */
1020 entry->ccmp = 1;
1021 memcpy(entry->last_pn,
1022 rx->key->u.ccmp.rx_pn[rx->queue],
1023 CCMP_PN_LEN);
1024 }
1025 return RX_QUEUED;
1026 }
1027
1028 /* This is a fragment for a frame that should already be pending in
1029 * fragment cache. Add this fragment to the end of the pending entry.
1030 */
1031 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
1032 if (!entry) {
1033 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1034 return RX_DROP_MONITOR;
1035 }
1036
1037 /* Verify that MPDUs within one MSDU have sequential PN values.
1038 * (IEEE 802.11i, 8.3.3.4.5) */
1039 if (entry->ccmp) {
1040 int i;
1041 u8 pn[CCMP_PN_LEN], *rpn;
1042 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
1043 return RX_DROP_UNUSABLE;
1044 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1045 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1046 pn[i]++;
1047 if (pn[i])
1048 break;
1049 }
1050 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
1051 if (memcmp(pn, rpn, CCMP_PN_LEN))
1052 return RX_DROP_UNUSABLE;
1053 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1054 }
1055
1056 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1057 __skb_queue_tail(&entry->skb_list, rx->skb);
1058 entry->last_frag = frag;
1059 entry->extra_len += rx->skb->len;
1060 if (ieee80211_has_morefrags(fc)) {
1061 rx->skb = NULL;
1062 return RX_QUEUED;
1063 }
1064
1065 rx->skb = __skb_dequeue(&entry->skb_list);
1066 if (skb_tailroom(rx->skb) < entry->extra_len) {
1067 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1068 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1069 GFP_ATOMIC))) {
1070 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1071 __skb_queue_purge(&entry->skb_list);
1072 return RX_DROP_UNUSABLE;
1073 }
1074 }
1075 while ((skb = __skb_dequeue(&entry->skb_list))) {
1076 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1077 dev_kfree_skb(skb);
1078 }
1079
1080 /* Complete frame has been reassembled - process it now */
1081 rx->flags |= IEEE80211_RX_FRAGMENTED;
1082
1083 out:
1084 if (rx->sta)
1085 rx->sta->rx_packets++;
1086 if (is_multicast_ether_addr(hdr->addr1))
1087 rx->local->dot11MulticastReceivedFrameCount++;
1088 else
1089 ieee80211_led_rx(rx->local);
1090 return RX_CONTINUE;
1091 }
1092
1093 static ieee80211_rx_result debug_noinline
1094 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
1095 {
1096 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1097 struct sk_buff *skb;
1098 int no_pending_pkts;
1099 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
1100
1101 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
1102 !(rx->flags & IEEE80211_RX_RA_MATCH)))
1103 return RX_CONTINUE;
1104
1105 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1106 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1107 return RX_DROP_UNUSABLE;
1108
1109 skb = skb_dequeue(&rx->sta->tx_filtered);
1110 if (!skb) {
1111 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1112 if (skb)
1113 rx->local->total_ps_buffered--;
1114 }
1115 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1116 skb_queue_empty(&rx->sta->ps_tx_buf);
1117
1118 if (skb) {
1119 struct ieee80211_hdr *hdr =
1120 (struct ieee80211_hdr *) skb->data;
1121
1122 /*
1123 * Tell TX path to send one frame even though the STA may
1124 * still remain is PS mode after this frame exchange.
1125 */
1126 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
1127
1128 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1129 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1130 rx->sta->sta.addr, rx->sta->sta.aid,
1131 skb_queue_len(&rx->sta->ps_tx_buf));
1132 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1133
1134 /* Use MoreData flag to indicate whether there are more
1135 * buffered frames for this STA */
1136 if (no_pending_pkts)
1137 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1138 else
1139 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1140
1141 dev_queue_xmit(skb);
1142
1143 if (no_pending_pkts)
1144 sta_info_clear_tim_bit(rx->sta);
1145 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1146 } else if (!rx->sent_ps_buffered) {
1147 /*
1148 * FIXME: This can be the result of a race condition between
1149 * us expiring a frame and the station polling for it.
1150 * Should we send it a null-func frame indicating we
1151 * have nothing buffered for it?
1152 */
1153 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1154 "though there are no buffered frames for it\n",
1155 rx->dev->name, rx->sta->sta.addr);
1156 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1157 }
1158
1159 /* Free PS Poll skb here instead of returning RX_DROP that would
1160 * count as an dropped frame. */
1161 dev_kfree_skb(rx->skb);
1162
1163 return RX_QUEUED;
1164 }
1165
1166 static ieee80211_rx_result debug_noinline
1167 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
1168 {
1169 u8 *data = rx->skb->data;
1170 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
1171
1172 if (!ieee80211_is_data_qos(hdr->frame_control))
1173 return RX_CONTINUE;
1174
1175 /* remove the qos control field, update frame type and meta-data */
1176 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1177 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1178 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
1179 /* change frame type to non QOS */
1180 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1181
1182 return RX_CONTINUE;
1183 }
1184
1185 static int
1186 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1187 {
1188 if (unlikely(!rx->sta ||
1189 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
1190 return -EACCES;
1191
1192 return 0;
1193 }
1194
1195 static int
1196 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1197 {
1198 /*
1199 * Pass through unencrypted frames if the hardware has
1200 * decrypted them already.
1201 */
1202 if (rx->status->flag & RX_FLAG_DECRYPTED)
1203 return 0;
1204
1205 /* Drop unencrypted frames if key is set. */
1206 if (unlikely(!ieee80211_has_protected(fc) &&
1207 !ieee80211_is_nullfunc(fc) &&
1208 ieee80211_is_data(fc) &&
1209 (rx->key || rx->sdata->drop_unencrypted)))
1210 return -EACCES;
1211 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1212 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1213 rx->key))
1214 return -EACCES;
1215 /* BIP does not use Protected field, so need to check MMIE */
1216 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1217 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1218 rx->key))
1219 return -EACCES;
1220 /*
1221 * When using MFP, Action frames are not allowed prior to
1222 * having configured keys.
1223 */
1224 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1225 ieee80211_is_robust_mgmt_frame(
1226 (struct ieee80211_hdr *) rx->skb->data)))
1227 return -EACCES;
1228 }
1229
1230 return 0;
1231 }
1232
1233 static int
1234 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
1235 {
1236 struct net_device *dev = rx->dev;
1237 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1238
1239 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
1240 }
1241
1242 /*
1243 * requires that rx->skb is a frame with ethernet header
1244 */
1245 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1246 {
1247 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1248 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1249 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1250
1251 /*
1252 * Allow EAPOL frames to us/the PAE group address regardless
1253 * of whether the frame was encrypted or not.
1254 */
1255 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1256 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1257 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1258 return true;
1259
1260 if (ieee80211_802_1x_port_control(rx) ||
1261 ieee80211_drop_unencrypted(rx, fc))
1262 return false;
1263
1264 return true;
1265 }
1266
1267 /*
1268 * requires that rx->skb is a frame with ethernet header
1269 */
1270 static void
1271 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1272 {
1273 struct net_device *dev = rx->dev;
1274 struct ieee80211_local *local = rx->local;
1275 struct sk_buff *skb, *xmit_skb;
1276 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1277 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1278 struct sta_info *dsta;
1279
1280 skb = rx->skb;
1281 xmit_skb = NULL;
1282
1283 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1284 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1285 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1286 (rx->flags & IEEE80211_RX_RA_MATCH)) {
1287 if (is_multicast_ether_addr(ehdr->h_dest)) {
1288 /*
1289 * send multicast frames both to higher layers in
1290 * local net stack and back to the wireless medium
1291 */
1292 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1293 if (!xmit_skb && net_ratelimit())
1294 printk(KERN_DEBUG "%s: failed to clone "
1295 "multicast frame\n", dev->name);
1296 } else {
1297 dsta = sta_info_get(local, skb->data);
1298 if (dsta && dsta->sdata->dev == dev) {
1299 /*
1300 * The destination station is associated to
1301 * this AP (in this VLAN), so send the frame
1302 * directly to it and do not pass it to local
1303 * net stack.
1304 */
1305 xmit_skb = skb;
1306 skb = NULL;
1307 }
1308 }
1309 }
1310
1311 if (skb) {
1312 int align __maybe_unused;
1313
1314 #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1315 /*
1316 * 'align' will only take the values 0 or 2 here
1317 * since all frames are required to be aligned
1318 * to 2-byte boundaries when being passed to
1319 * mac80211. That also explains the __skb_push()
1320 * below.
1321 */
1322 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1323 if (align) {
1324 if (WARN_ON(skb_headroom(skb) < 3)) {
1325 dev_kfree_skb(skb);
1326 skb = NULL;
1327 } else {
1328 u8 *data = skb->data;
1329 size_t len = skb->len;
1330 u8 *new = __skb_push(skb, align);
1331 memmove(new, data, len);
1332 __skb_trim(skb, len);
1333 }
1334 }
1335 #endif
1336
1337 if (skb) {
1338 /* deliver to local stack */
1339 skb->protocol = eth_type_trans(skb, dev);
1340 memset(skb->cb, 0, sizeof(skb->cb));
1341 netif_rx(skb);
1342 }
1343 }
1344
1345 if (xmit_skb) {
1346 /* send to wireless media */
1347 xmit_skb->protocol = htons(ETH_P_802_3);
1348 skb_reset_network_header(xmit_skb);
1349 skb_reset_mac_header(xmit_skb);
1350 dev_queue_xmit(xmit_skb);
1351 }
1352 }
1353
1354 static ieee80211_rx_result debug_noinline
1355 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1356 {
1357 struct net_device *dev = rx->dev;
1358 struct ieee80211_local *local = rx->local;
1359 u16 ethertype;
1360 u8 *payload;
1361 struct sk_buff *skb = rx->skb, *frame = NULL;
1362 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1363 __le16 fc = hdr->frame_control;
1364 const struct ethhdr *eth;
1365 int remaining, err;
1366 u8 dst[ETH_ALEN];
1367 u8 src[ETH_ALEN];
1368
1369 if (unlikely(!ieee80211_is_data(fc)))
1370 return RX_CONTINUE;
1371
1372 if (unlikely(!ieee80211_is_data_present(fc)))
1373 return RX_DROP_MONITOR;
1374
1375 if (!(rx->flags & IEEE80211_RX_AMSDU))
1376 return RX_CONTINUE;
1377
1378 err = __ieee80211_data_to_8023(rx);
1379 if (unlikely(err))
1380 return RX_DROP_UNUSABLE;
1381
1382 skb->dev = dev;
1383
1384 dev->stats.rx_packets++;
1385 dev->stats.rx_bytes += skb->len;
1386
1387 /* skip the wrapping header */
1388 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1389 if (!eth)
1390 return RX_DROP_UNUSABLE;
1391
1392 while (skb != frame) {
1393 u8 padding;
1394 __be16 len = eth->h_proto;
1395 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1396
1397 remaining = skb->len;
1398 memcpy(dst, eth->h_dest, ETH_ALEN);
1399 memcpy(src, eth->h_source, ETH_ALEN);
1400
1401 padding = ((4 - subframe_len) & 0x3);
1402 /* the last MSDU has no padding */
1403 if (subframe_len > remaining)
1404 return RX_DROP_UNUSABLE;
1405
1406 skb_pull(skb, sizeof(struct ethhdr));
1407 /* if last subframe reuse skb */
1408 if (remaining <= subframe_len + padding)
1409 frame = skb;
1410 else {
1411 /*
1412 * Allocate and reserve two bytes more for payload
1413 * alignment since sizeof(struct ethhdr) is 14.
1414 */
1415 frame = dev_alloc_skb(
1416 ALIGN(local->hw.extra_tx_headroom, 4) +
1417 subframe_len + 2);
1418
1419 if (frame == NULL)
1420 return RX_DROP_UNUSABLE;
1421
1422 skb_reserve(frame,
1423 ALIGN(local->hw.extra_tx_headroom, 4) +
1424 sizeof(struct ethhdr) + 2);
1425 memcpy(skb_put(frame, ntohs(len)), skb->data,
1426 ntohs(len));
1427
1428 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1429 padding);
1430 if (!eth) {
1431 dev_kfree_skb(frame);
1432 return RX_DROP_UNUSABLE;
1433 }
1434 }
1435
1436 skb_reset_network_header(frame);
1437 frame->dev = dev;
1438 frame->priority = skb->priority;
1439 rx->skb = frame;
1440
1441 payload = frame->data;
1442 ethertype = (payload[6] << 8) | payload[7];
1443
1444 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1445 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1446 compare_ether_addr(payload,
1447 bridge_tunnel_header) == 0)) {
1448 /* remove RFC1042 or Bridge-Tunnel
1449 * encapsulation and replace EtherType */
1450 skb_pull(frame, 6);
1451 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1452 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1453 } else {
1454 memcpy(skb_push(frame, sizeof(__be16)),
1455 &len, sizeof(__be16));
1456 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1457 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1458 }
1459
1460 if (!ieee80211_frame_allowed(rx, fc)) {
1461 if (skb == frame) /* last frame */
1462 return RX_DROP_UNUSABLE;
1463 dev_kfree_skb(frame);
1464 continue;
1465 }
1466
1467 ieee80211_deliver_skb(rx);
1468 }
1469
1470 return RX_QUEUED;
1471 }
1472
1473 #ifdef CONFIG_MAC80211_MESH
1474 static ieee80211_rx_result
1475 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1476 {
1477 struct ieee80211_hdr *hdr;
1478 struct ieee80211s_hdr *mesh_hdr;
1479 unsigned int hdrlen;
1480 struct sk_buff *skb = rx->skb, *fwd_skb;
1481 struct ieee80211_local *local = rx->local;
1482
1483 hdr = (struct ieee80211_hdr *) skb->data;
1484 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1485 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1486
1487 if (!ieee80211_is_data(hdr->frame_control))
1488 return RX_CONTINUE;
1489
1490 if (!mesh_hdr->ttl)
1491 /* illegal frame */
1492 return RX_DROP_MONITOR;
1493
1494 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1495 struct ieee80211_sub_if_data *sdata;
1496 struct mesh_path *mppath;
1497
1498 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1499 rcu_read_lock();
1500 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1501 if (!mppath) {
1502 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1503 } else {
1504 spin_lock_bh(&mppath->state_lock);
1505 mppath->exp_time = jiffies;
1506 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1507 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1508 spin_unlock_bh(&mppath->state_lock);
1509 }
1510 rcu_read_unlock();
1511 }
1512
1513 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1514 return RX_CONTINUE;
1515
1516 mesh_hdr->ttl--;
1517
1518 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1519 if (!mesh_hdr->ttl)
1520 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
1521 dropped_frames_ttl);
1522 else {
1523 struct ieee80211_hdr *fwd_hdr;
1524 struct ieee80211_tx_info *info;
1525
1526 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1527
1528 if (!fwd_skb && net_ratelimit())
1529 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1530 rx->dev->name);
1531
1532 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1533 /*
1534 * Save TA to addr1 to send TA a path error if a
1535 * suitable next hop is not found
1536 */
1537 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1538 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1539 info = IEEE80211_SKB_CB(fwd_skb);
1540 memset(info, 0, sizeof(*info));
1541 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1542 fwd_skb->iif = rx->dev->ifindex;
1543 ieee80211_select_queue(local, fwd_skb);
1544 ieee80211_add_pending_skb(local, 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 or not associated yet. */
1645 return;
1646 }
1647
1648 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1649 /* Too short SA Query request frame */
1650 return;
1651 }
1652
1653 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1654 if (skb == NULL)
1655 return;
1656
1657 skb_reserve(skb, local->hw.extra_tx_headroom);
1658 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1659 memset(resp, 0, 24);
1660 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1661 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
1662 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
1663 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1664 IEEE80211_STYPE_ACTION);
1665 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1666 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1667 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1668 memcpy(resp->u.action.u.sa_query.trans_id,
1669 mgmt->u.action.u.sa_query.trans_id,
1670 WLAN_SA_QUERY_TR_ID_LEN);
1671
1672 ieee80211_tx_skb(sdata, skb, 1);
1673 }
1674
1675 static ieee80211_rx_result debug_noinline
1676 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1677 {
1678 struct ieee80211_local *local = rx->local;
1679 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1680 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1681 int len = rx->skb->len;
1682
1683 if (!ieee80211_is_action(mgmt->frame_control))
1684 return RX_CONTINUE;
1685
1686 if (!rx->sta)
1687 return RX_DROP_MONITOR;
1688
1689 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1690 return RX_DROP_MONITOR;
1691
1692 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1693 return RX_DROP_MONITOR;
1694
1695 /* all categories we currently handle have action_code */
1696 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1697 return RX_DROP_MONITOR;
1698
1699 switch (mgmt->u.action.category) {
1700 case WLAN_CATEGORY_BACK:
1701 /*
1702 * The aggregation code is not prepared to handle
1703 * anything but STA/AP due to the BSSID handling;
1704 * IBSS could work in the code but isn't supported
1705 * by drivers or the standard.
1706 */
1707 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1708 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1709 sdata->vif.type != NL80211_IFTYPE_AP)
1710 return RX_DROP_MONITOR;
1711
1712 switch (mgmt->u.action.u.addba_req.action_code) {
1713 case WLAN_ACTION_ADDBA_REQ:
1714 if (len < (IEEE80211_MIN_ACTION_SIZE +
1715 sizeof(mgmt->u.action.u.addba_req)))
1716 return RX_DROP_MONITOR;
1717 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1718 break;
1719 case WLAN_ACTION_ADDBA_RESP:
1720 if (len < (IEEE80211_MIN_ACTION_SIZE +
1721 sizeof(mgmt->u.action.u.addba_resp)))
1722 return RX_DROP_MONITOR;
1723 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1724 break;
1725 case WLAN_ACTION_DELBA:
1726 if (len < (IEEE80211_MIN_ACTION_SIZE +
1727 sizeof(mgmt->u.action.u.delba)))
1728 return RX_DROP_MONITOR;
1729 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1730 break;
1731 }
1732 break;
1733 case WLAN_CATEGORY_SPECTRUM_MGMT:
1734 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1735 return RX_DROP_MONITOR;
1736
1737 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1738 return RX_DROP_MONITOR;
1739
1740 switch (mgmt->u.action.u.measurement.action_code) {
1741 case WLAN_ACTION_SPCT_MSR_REQ:
1742 if (len < (IEEE80211_MIN_ACTION_SIZE +
1743 sizeof(mgmt->u.action.u.measurement)))
1744 return RX_DROP_MONITOR;
1745 ieee80211_process_measurement_req(sdata, mgmt, len);
1746 break;
1747 case WLAN_ACTION_SPCT_CHL_SWITCH:
1748 if (len < (IEEE80211_MIN_ACTION_SIZE +
1749 sizeof(mgmt->u.action.u.chan_switch)))
1750 return RX_DROP_MONITOR;
1751
1752 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1753 return RX_DROP_MONITOR;
1754
1755 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
1756 return RX_DROP_MONITOR;
1757
1758 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1759 }
1760 break;
1761 case WLAN_CATEGORY_SA_QUERY:
1762 if (len < (IEEE80211_MIN_ACTION_SIZE +
1763 sizeof(mgmt->u.action.u.sa_query)))
1764 return RX_DROP_MONITOR;
1765 switch (mgmt->u.action.u.sa_query.action) {
1766 case WLAN_ACTION_SA_QUERY_REQUEST:
1767 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1768 return RX_DROP_MONITOR;
1769 ieee80211_process_sa_query_req(sdata, mgmt, len);
1770 break;
1771 case WLAN_ACTION_SA_QUERY_RESPONSE:
1772 /*
1773 * SA Query response is currently only used in AP mode
1774 * and it is processed in user space.
1775 */
1776 return RX_CONTINUE;
1777 }
1778 break;
1779 default:
1780 return RX_CONTINUE;
1781 }
1782
1783 rx->sta->rx_packets++;
1784 dev_kfree_skb(rx->skb);
1785 return RX_QUEUED;
1786 }
1787
1788 static ieee80211_rx_result debug_noinline
1789 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
1790 {
1791 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1792 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1793
1794 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1795 return RX_DROP_MONITOR;
1796
1797 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1798 return RX_DROP_MONITOR;
1799
1800 if (ieee80211_vif_is_mesh(&sdata->vif))
1801 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
1802
1803 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
1804 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
1805
1806 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1807 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
1808
1809 return RX_DROP_MONITOR;
1810 }
1811
1812 static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
1813 struct ieee80211_rx_data *rx)
1814 {
1815 int keyidx;
1816 unsigned int hdrlen;
1817
1818 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1819 if (rx->skb->len >= hdrlen + 4)
1820 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1821 else
1822 keyidx = -1;
1823
1824 if (!rx->sta) {
1825 /*
1826 * Some hardware seem to generate incorrect Michael MIC
1827 * reports; ignore them to avoid triggering countermeasures.
1828 */
1829 goto ignore;
1830 }
1831
1832 if (!ieee80211_has_protected(hdr->frame_control))
1833 goto ignore;
1834
1835 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
1836 /*
1837 * APs with pairwise keys should never receive Michael MIC
1838 * errors for non-zero keyidx because these are reserved for
1839 * group keys and only the AP is sending real multicast
1840 * frames in the BSS.
1841 */
1842 goto ignore;
1843 }
1844
1845 if (!ieee80211_is_data(hdr->frame_control) &&
1846 !ieee80211_is_auth(hdr->frame_control))
1847 goto ignore;
1848
1849 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1850 GFP_ATOMIC);
1851 ignore:
1852 dev_kfree_skb(rx->skb);
1853 rx->skb = NULL;
1854 }
1855
1856 /* TODO: use IEEE80211_RX_FRAGMENTED */
1857 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
1858 {
1859 struct ieee80211_sub_if_data *sdata;
1860 struct ieee80211_local *local = rx->local;
1861 struct ieee80211_rtap_hdr {
1862 struct ieee80211_radiotap_header hdr;
1863 u8 flags;
1864 u8 rate;
1865 __le16 chan_freq;
1866 __le16 chan_flags;
1867 } __attribute__ ((packed)) *rthdr;
1868 struct sk_buff *skb = rx->skb, *skb2;
1869 struct net_device *prev_dev = NULL;
1870 struct ieee80211_rx_status *status = rx->status;
1871
1872 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
1873 goto out_free_skb;
1874
1875 if (skb_headroom(skb) < sizeof(*rthdr) &&
1876 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1877 goto out_free_skb;
1878
1879 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1880 memset(rthdr, 0, sizeof(*rthdr));
1881 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1882 rthdr->hdr.it_present =
1883 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1884 (1 << IEEE80211_RADIOTAP_RATE) |
1885 (1 << IEEE80211_RADIOTAP_CHANNEL));
1886
1887 rthdr->rate = rx->rate->bitrate / 5;
1888 rthdr->chan_freq = cpu_to_le16(status->freq);
1889
1890 if (status->band == IEEE80211_BAND_5GHZ)
1891 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1892 IEEE80211_CHAN_5GHZ);
1893 else
1894 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1895 IEEE80211_CHAN_2GHZ);
1896
1897 skb_set_mac_header(skb, 0);
1898 skb->ip_summed = CHECKSUM_UNNECESSARY;
1899 skb->pkt_type = PACKET_OTHERHOST;
1900 skb->protocol = htons(ETH_P_802_2);
1901
1902 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1903 if (!netif_running(sdata->dev))
1904 continue;
1905
1906 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1907 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1908 continue;
1909
1910 if (prev_dev) {
1911 skb2 = skb_clone(skb, GFP_ATOMIC);
1912 if (skb2) {
1913 skb2->dev = prev_dev;
1914 netif_rx(skb2);
1915 }
1916 }
1917
1918 prev_dev = sdata->dev;
1919 sdata->dev->stats.rx_packets++;
1920 sdata->dev->stats.rx_bytes += skb->len;
1921 }
1922
1923 if (prev_dev) {
1924 skb->dev = prev_dev;
1925 netif_rx(skb);
1926 skb = NULL;
1927 } else
1928 goto out_free_skb;
1929
1930 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
1931 return;
1932
1933 out_free_skb:
1934 dev_kfree_skb(skb);
1935 }
1936
1937
1938 static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
1939 struct ieee80211_rx_data *rx,
1940 struct sk_buff *skb)
1941 {
1942 ieee80211_rx_result res = RX_DROP_MONITOR;
1943
1944 rx->skb = skb;
1945 rx->sdata = sdata;
1946 rx->dev = sdata->dev;
1947
1948 #define CALL_RXH(rxh) \
1949 do { \
1950 res = rxh(rx); \
1951 if (res != RX_CONTINUE) \
1952 goto rxh_done; \
1953 } while (0);
1954
1955 CALL_RXH(ieee80211_rx_h_passive_scan)
1956 CALL_RXH(ieee80211_rx_h_check)
1957 CALL_RXH(ieee80211_rx_h_decrypt)
1958 CALL_RXH(ieee80211_rx_h_check_more_data)
1959 CALL_RXH(ieee80211_rx_h_sta_process)
1960 CALL_RXH(ieee80211_rx_h_defragment)
1961 CALL_RXH(ieee80211_rx_h_ps_poll)
1962 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1963 /* must be after MMIC verify so header is counted in MPDU mic */
1964 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1965 CALL_RXH(ieee80211_rx_h_amsdu)
1966 #ifdef CONFIG_MAC80211_MESH
1967 if (ieee80211_vif_is_mesh(&sdata->vif))
1968 CALL_RXH(ieee80211_rx_h_mesh_fwding);
1969 #endif
1970 CALL_RXH(ieee80211_rx_h_data)
1971 CALL_RXH(ieee80211_rx_h_ctrl)
1972 CALL_RXH(ieee80211_rx_h_action)
1973 CALL_RXH(ieee80211_rx_h_mgmt)
1974
1975 #undef CALL_RXH
1976
1977 rxh_done:
1978 switch (res) {
1979 case RX_DROP_MONITOR:
1980 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1981 if (rx->sta)
1982 rx->sta->rx_dropped++;
1983 /* fall through */
1984 case RX_CONTINUE:
1985 ieee80211_rx_cooked_monitor(rx);
1986 break;
1987 case RX_DROP_UNUSABLE:
1988 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1989 if (rx->sta)
1990 rx->sta->rx_dropped++;
1991 dev_kfree_skb(rx->skb);
1992 break;
1993 case RX_QUEUED:
1994 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1995 break;
1996 }
1997 }
1998
1999 /* main receive path */
2000
2001 static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
2002 struct ieee80211_rx_data *rx,
2003 struct ieee80211_hdr *hdr)
2004 {
2005 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
2006 int multicast = is_multicast_ether_addr(hdr->addr1);
2007
2008 switch (sdata->vif.type) {
2009 case NL80211_IFTYPE_STATION:
2010 if (!bssid)
2011 return 0;
2012 if (!multicast &&
2013 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
2014 if (!(sdata->dev->flags & IFF_PROMISC))
2015 return 0;
2016 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2017 }
2018 break;
2019 case NL80211_IFTYPE_ADHOC:
2020 if (!bssid)
2021 return 0;
2022 if (ieee80211_is_beacon(hdr->frame_control)) {
2023 return 1;
2024 }
2025 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2026 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2027 return 0;
2028 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2029 } else if (!multicast &&
2030 compare_ether_addr(sdata->dev->dev_addr,
2031 hdr->addr1) != 0) {
2032 if (!(sdata->dev->flags & IFF_PROMISC))
2033 return 0;
2034 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2035 } else if (!rx->sta) {
2036 int rate_idx;
2037 if (rx->status->flag & RX_FLAG_HT)
2038 rate_idx = 0; /* TODO: HT rates */
2039 else
2040 rate_idx = rx->status->rate_idx;
2041 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
2042 BIT(rate_idx));
2043 }
2044 break;
2045 case NL80211_IFTYPE_MESH_POINT:
2046 if (!multicast &&
2047 compare_ether_addr(sdata->dev->dev_addr,
2048 hdr->addr1) != 0) {
2049 if (!(sdata->dev->flags & IFF_PROMISC))
2050 return 0;
2051
2052 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2053 }
2054 break;
2055 case NL80211_IFTYPE_AP_VLAN:
2056 case NL80211_IFTYPE_AP:
2057 if (!bssid) {
2058 if (compare_ether_addr(sdata->dev->dev_addr,
2059 hdr->addr1))
2060 return 0;
2061 } else if (!ieee80211_bssid_match(bssid,
2062 sdata->dev->dev_addr)) {
2063 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
2064 return 0;
2065 rx->flags &= ~IEEE80211_RX_RA_MATCH;
2066 }
2067 break;
2068 case NL80211_IFTYPE_WDS:
2069 if (bssid || !ieee80211_is_data(hdr->frame_control))
2070 return 0;
2071 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2072 return 0;
2073 break;
2074 case NL80211_IFTYPE_MONITOR:
2075 /* take everything */
2076 break;
2077 case NL80211_IFTYPE_UNSPECIFIED:
2078 case __NL80211_IFTYPE_AFTER_LAST:
2079 /* should never get here */
2080 WARN_ON(1);
2081 break;
2082 }
2083
2084 return 1;
2085 }
2086
2087 /*
2088 * This is the actual Rx frames handler. as it blongs to Rx path it must
2089 * be called with rcu_read_lock protection.
2090 */
2091 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2092 struct sk_buff *skb,
2093 struct ieee80211_rate *rate)
2094 {
2095 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2096 struct ieee80211_local *local = hw_to_local(hw);
2097 struct ieee80211_sub_if_data *sdata;
2098 struct ieee80211_hdr *hdr;
2099 struct ieee80211_rx_data rx;
2100 int prepares;
2101 struct ieee80211_sub_if_data *prev = NULL;
2102 struct sk_buff *skb_new;
2103
2104 hdr = (struct ieee80211_hdr *)skb->data;
2105 memset(&rx, 0, sizeof(rx));
2106 rx.skb = skb;
2107 rx.local = local;
2108
2109 rx.status = status;
2110 rx.rate = rate;
2111
2112 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
2113 local->dot11ReceivedFragmentCount++;
2114
2115 rx.sta = sta_info_get(local, hdr->addr2);
2116 if (rx.sta) {
2117 rx.sdata = rx.sta->sdata;
2118 rx.dev = rx.sta->sdata->dev;
2119 }
2120
2121 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
2122 ieee80211_rx_michael_mic_report(hdr, &rx);
2123 return;
2124 }
2125
2126 if (unlikely(local->sw_scanning || local->hw_scanning))
2127 rx.flags |= IEEE80211_RX_IN_SCAN;
2128
2129 ieee80211_parse_qos(&rx);
2130 ieee80211_verify_alignment(&rx);
2131
2132 skb = rx.skb;
2133
2134 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2135 if (!netif_running(sdata->dev))
2136 continue;
2137
2138 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2139 continue;
2140
2141 rx.flags |= IEEE80211_RX_RA_MATCH;
2142 prepares = prepare_for_handlers(sdata, &rx, hdr);
2143
2144 if (!prepares)
2145 continue;
2146
2147 /*
2148 * frame is destined for this interface, but if it's not
2149 * also for the previous one we handle that after the
2150 * loop to avoid copying the SKB once too much
2151 */
2152
2153 if (!prev) {
2154 prev = sdata;
2155 continue;
2156 }
2157
2158 /*
2159 * frame was destined for the previous interface
2160 * so invoke RX handlers for it
2161 */
2162
2163 skb_new = skb_copy(skb, GFP_ATOMIC);
2164 if (!skb_new) {
2165 if (net_ratelimit())
2166 printk(KERN_DEBUG "%s: failed to copy "
2167 "multicast frame for %s\n",
2168 wiphy_name(local->hw.wiphy),
2169 prev->dev->name);
2170 continue;
2171 }
2172 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
2173 prev = sdata;
2174 }
2175 if (prev)
2176 ieee80211_invoke_rx_handlers(prev, &rx, skb);
2177 else
2178 dev_kfree_skb(skb);
2179 }
2180
2181 #define SEQ_MODULO 0x1000
2182 #define SEQ_MASK 0xfff
2183
2184 static inline int seq_less(u16 sq1, u16 sq2)
2185 {
2186 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
2187 }
2188
2189 static inline u16 seq_inc(u16 sq)
2190 {
2191 return (sq + 1) & SEQ_MASK;
2192 }
2193
2194 static inline u16 seq_sub(u16 sq1, u16 sq2)
2195 {
2196 return (sq1 - sq2) & SEQ_MASK;
2197 }
2198
2199
2200 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2201 struct tid_ampdu_rx *tid_agg_rx,
2202 int index)
2203 {
2204 struct ieee80211_supported_band *sband;
2205 struct ieee80211_rate *rate;
2206 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2207 struct ieee80211_rx_status *status;
2208
2209 if (!skb)
2210 goto no_frame;
2211
2212 status = IEEE80211_SKB_RXCB(skb);
2213
2214 /* release the reordered frames to stack */
2215 sband = hw->wiphy->bands[status->band];
2216 if (status->flag & RX_FLAG_HT)
2217 rate = sband->bitrates; /* TODO: HT rates */
2218 else
2219 rate = &sband->bitrates[status->rate_idx];
2220 __ieee80211_rx_handle_packet(hw, skb, rate);
2221 tid_agg_rx->stored_mpdu_num--;
2222 tid_agg_rx->reorder_buf[index] = NULL;
2223
2224 no_frame:
2225 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2226 }
2227
2228
2229 /*
2230 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2231 * the skb was added to the buffer longer than this time ago, the earlier
2232 * frames that have not yet been received are assumed to be lost and the skb
2233 * can be released for processing. This may also release other skb's from the
2234 * reorder buffer if there are no additional gaps between the frames.
2235 */
2236 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2237
2238 /*
2239 * As it function blongs to Rx path it must be called with
2240 * the proper rcu_read_lock protection for its flow.
2241 */
2242 static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2243 struct tid_ampdu_rx *tid_agg_rx,
2244 struct sk_buff *skb,
2245 u16 mpdu_seq_num,
2246 int bar_req)
2247 {
2248 u16 head_seq_num, buf_size;
2249 int index;
2250
2251 buf_size = tid_agg_rx->buf_size;
2252 head_seq_num = tid_agg_rx->head_seq_num;
2253
2254 /* frame with out of date sequence number */
2255 if (seq_less(mpdu_seq_num, head_seq_num)) {
2256 dev_kfree_skb(skb);
2257 return 1;
2258 }
2259
2260 /* if frame sequence number exceeds our buffering window size or
2261 * block Ack Request arrived - release stored frames */
2262 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2263 /* new head to the ordering buffer */
2264 if (bar_req)
2265 head_seq_num = mpdu_seq_num;
2266 else
2267 head_seq_num =
2268 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2269 /* release stored frames up to new head to stack */
2270 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2271 index = seq_sub(tid_agg_rx->head_seq_num,
2272 tid_agg_rx->ssn)
2273 % tid_agg_rx->buf_size;
2274 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2275 index);
2276 }
2277 if (bar_req)
2278 return 1;
2279 }
2280
2281 /* now the new frame is always in the range of the reordering */
2282 /* buffer window */
2283 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2284 % tid_agg_rx->buf_size;
2285 /* check if we already stored this frame */
2286 if (tid_agg_rx->reorder_buf[index]) {
2287 dev_kfree_skb(skb);
2288 return 1;
2289 }
2290
2291 /* if arrived mpdu is in the right order and nothing else stored */
2292 /* release it immediately */
2293 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2294 tid_agg_rx->stored_mpdu_num == 0) {
2295 tid_agg_rx->head_seq_num =
2296 seq_inc(tid_agg_rx->head_seq_num);
2297 return 0;
2298 }
2299
2300 /* put the frame in the reordering buffer */
2301 tid_agg_rx->reorder_buf[index] = skb;
2302 tid_agg_rx->reorder_time[index] = jiffies;
2303 tid_agg_rx->stored_mpdu_num++;
2304 /* release the buffer until next missing frame */
2305 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2306 % tid_agg_rx->buf_size;
2307 if (!tid_agg_rx->reorder_buf[index] &&
2308 tid_agg_rx->stored_mpdu_num > 1) {
2309 /*
2310 * No buffers ready to be released, but check whether any
2311 * frames in the reorder buffer have timed out.
2312 */
2313 int j;
2314 int skipped = 1;
2315 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2316 j = (j + 1) % tid_agg_rx->buf_size) {
2317 if (tid_agg_rx->reorder_buf[j] == NULL) {
2318 skipped++;
2319 continue;
2320 }
2321 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2322 HZ / 10))
2323 break;
2324
2325 #ifdef CONFIG_MAC80211_HT_DEBUG
2326 if (net_ratelimit())
2327 printk(KERN_DEBUG "%s: release an RX reorder "
2328 "frame due to timeout on earlier "
2329 "frames\n",
2330 wiphy_name(hw->wiphy));
2331 #endif
2332 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2333
2334 /*
2335 * Increment the head seq# also for the skipped slots.
2336 */
2337 tid_agg_rx->head_seq_num =
2338 (tid_agg_rx->head_seq_num + skipped) &
2339 SEQ_MASK;
2340 skipped = 0;
2341 }
2342 } else while (tid_agg_rx->reorder_buf[index]) {
2343 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
2344 index = seq_sub(tid_agg_rx->head_seq_num,
2345 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2346 }
2347 return 1;
2348 }
2349
2350 static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2351 struct sk_buff *skb)
2352 {
2353 struct ieee80211_hw *hw = &local->hw;
2354 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2355 struct sta_info *sta;
2356 struct tid_ampdu_rx *tid_agg_rx;
2357 u16 sc;
2358 u16 mpdu_seq_num;
2359 u8 ret = 0;
2360 int tid;
2361
2362 sta = sta_info_get(local, hdr->addr2);
2363 if (!sta)
2364 return ret;
2365
2366 /* filter the QoS data rx stream according to
2367 * STA/TID and check if this STA/TID is on aggregation */
2368 if (!ieee80211_is_data_qos(hdr->frame_control))
2369 goto end_reorder;
2370
2371 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2372
2373 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
2374 goto end_reorder;
2375
2376 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2377
2378 /* qos null data frames are excluded */
2379 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
2380 goto end_reorder;
2381
2382 /* new un-ordered ampdu frame - process it */
2383
2384 /* reset session timer */
2385 if (tid_agg_rx->timeout)
2386 mod_timer(&tid_agg_rx->session_timer,
2387 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2388
2389 /* if this mpdu is fragmented - terminate rx aggregation session */
2390 sc = le16_to_cpu(hdr->seq_ctrl);
2391 if (sc & IEEE80211_SCTL_FRAG) {
2392 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
2393 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2394 ret = 1;
2395 goto end_reorder;
2396 }
2397
2398 /* according to mpdu sequence number deal with reordering buffer */
2399 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2400 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2401 mpdu_seq_num, 0);
2402 end_reorder:
2403 return ret;
2404 }
2405
2406 /*
2407 * This is the receive path handler. It is called by a low level driver when an
2408 * 802.11 MPDU is received from the hardware.
2409 */
2410 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
2411 {
2412 struct ieee80211_local *local = hw_to_local(hw);
2413 struct ieee80211_rate *rate = NULL;
2414 struct ieee80211_supported_band *sband;
2415 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2416
2417 if (status->band < 0 ||
2418 status->band >= IEEE80211_NUM_BANDS) {
2419 WARN_ON(1);
2420 return;
2421 }
2422
2423 sband = local->hw.wiphy->bands[status->band];
2424 if (!sband) {
2425 WARN_ON(1);
2426 return;
2427 }
2428
2429 if (status->flag & RX_FLAG_HT) {
2430 /* rate_idx is MCS index */
2431 if (WARN_ON(status->rate_idx < 0 ||
2432 status->rate_idx >= 76))
2433 return;
2434 /* HT rates are not in the table - use the highest legacy rate
2435 * for now since other parts of mac80211 may not yet be fully
2436 * MCS aware. */
2437 rate = &sband->bitrates[sband->n_bitrates - 1];
2438 } else {
2439 if (WARN_ON(status->rate_idx < 0 ||
2440 status->rate_idx >= sband->n_bitrates))
2441 return;
2442 rate = &sband->bitrates[status->rate_idx];
2443 }
2444
2445 /*
2446 * key references and virtual interfaces are protected using RCU
2447 * and this requires that we are in a read-side RCU section during
2448 * receive processing
2449 */
2450 rcu_read_lock();
2451
2452 /*
2453 * Frames with failed FCS/PLCP checksum are not returned,
2454 * all other frames are returned without radiotap header
2455 * if it was previously present.
2456 * Also, frames with less than 16 bytes are dropped.
2457 */
2458 skb = ieee80211_rx_monitor(local, skb, rate);
2459 if (!skb) {
2460 rcu_read_unlock();
2461 return;
2462 }
2463
2464 /*
2465 * In theory, the block ack reordering should happen after duplicate
2466 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2467 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2468 * happen as a new RX handler between ieee80211_rx_h_check and
2469 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2470 * the time being, the call can be here since RX reorder buf processing
2471 * will implicitly skip duplicates. We could, in theory at least,
2472 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2473 * frames from other than operational channel), but that should not
2474 * happen in normal networks.
2475 */
2476 if (!ieee80211_rx_reorder_ampdu(local, skb))
2477 __ieee80211_rx_handle_packet(hw, skb, rate);
2478
2479 rcu_read_unlock();
2480 }
2481 EXPORT_SYMBOL(__ieee80211_rx);
2482
2483 /* This is a version of the rx handler that can be called from hard irq
2484 * context. Post the skb on the queue and schedule the tasklet */
2485 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
2486 {
2487 struct ieee80211_local *local = hw_to_local(hw);
2488
2489 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2490
2491 skb->pkt_type = IEEE80211_RX_MSG;
2492 skb_queue_tail(&local->skb_queue, skb);
2493 tasklet_schedule(&local->tasklet);
2494 }
2495 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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