blob: 564389ff5d168bbf40fdf242ad9a591c11d0f997 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -07001/*
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 2007-2010 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/slab.h>
14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
18#include <linux/rcupdate.h>
19#include <linux/export.h>
20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
22#include <asm/unaligned.h>
23
24#include "ieee80211_i.h"
25#include "driver-ops.h"
26#include "led.h"
27#include "mesh.h"
28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
32#include "rate.h"
33
34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
41 struct sk_buff *skb)
42{
43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
45 __pskb_trim(skb, skb->len - FCS_LEN);
46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
57static inline int should_drop_frame(struct sk_buff *skb,
58 int present_fcs_len)
59{
60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
62
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 return 1;
65 if (unlikely(skb->len < 16 + present_fcs_len))
66 return 1;
67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
70 return 1;
71 return 0;
72}
73
74static int
75ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
77{
78 int len;
79
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
82
83 if (status->flag & RX_FLAG_MACTIME_MPDU)
84 len += 8;
85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
86 len += 1;
87
88 if (len & 1) /* padding for RX_FLAGS if necessary */
89 len++;
90
91 if (status->flag & RX_FLAG_HT) /* HT info */
92 len += 3;
93
94 return len;
95}
96
97/*
98 * ieee80211_add_rx_radiotap_header - add radiotap header
99 *
100 * add a radiotap header containing all the fields which the hardware provided.
101 */
102static void
103ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct sk_buff *skb,
105 struct ieee80211_rate *rate,
106 int rtap_len, bool has_fcs)
107{
108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
109 struct ieee80211_radiotap_header *rthdr;
110 unsigned char *pos;
111 u16 rx_flags = 0;
112
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
115
116 /* radiotap header, set always present flags */
117 rthdr->it_present =
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
123
124 pos = (unsigned char *)(rthdr+1);
125
126 /* the order of the following fields is important */
127
128 /* IEEE80211_RADIOTAP_TSFT */
129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
130 put_unaligned_le64(status->mactime, pos);
131 rthdr->it_present |=
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 pos += 8;
134 }
135
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
138 *pos |= IEEE80211_RADIOTAP_F_FCS;
139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
143 pos++;
144
145 /* IEEE80211_RADIOTAP_RATE */
146 if (!rate || status->flag & RX_FLAG_HT) {
147 /*
148 * Without rate information don't add it. If we have,
149 * MCS information is a separate field in radiotap,
150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
152 */
153 *pos = 0;
154 } else {
155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
156 *pos = rate->bitrate / 5;
157 }
158 pos++;
159
160 /* IEEE80211_RADIOTAP_CHANNEL */
161 put_unaligned_le16(status->freq, pos);
162 pos += 2;
163 if (status->band == IEEE80211_BAND_5GHZ)
164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 pos);
166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
168 pos);
169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 pos);
172 else if (rate)
173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 pos);
175 else
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
177 pos += 2;
178
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
182 *pos = status->signal;
183 rthdr->it_present |=
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 pos++;
186 }
187
188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
189
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
192 pos++;
193
194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
195
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
198 if ((pos - (u8 *)rthdr) & 1)
199 pos++;
200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
203 pos += 2;
204
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
207 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
208 IEEE80211_RADIOTAP_MCS_HAVE_GI |
209 IEEE80211_RADIOTAP_MCS_HAVE_BW;
210 *pos = 0;
211 if (status->flag & RX_FLAG_SHORT_GI)
212 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
213 if (status->flag & RX_FLAG_40MHZ)
214 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
215 pos++;
216 *pos++ = status->rate_idx;
217 }
218}
219
220/*
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
224 */
225static struct sk_buff *
226ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
227 struct ieee80211_rate *rate)
228{
229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
230 struct ieee80211_sub_if_data *sdata;
231 int needed_headroom;
232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
235
236 /*
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
240 *
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
243 */
244
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
247
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
250
251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
257 if (!local->monitors) {
258 if (should_drop_frame(origskb, present_fcs_len)) {
259 dev_kfree_skb(origskb);
260 return NULL;
261 }
262
263 return remove_monitor_info(local, origskb);
264 }
265
266 if (should_drop_frame(origskb, present_fcs_len)) {
267 /* only need to expand headroom if necessary */
268 skb = origskb;
269 origskb = NULL;
270
271 /*
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
277 */
278 if (skb_headroom(skb) < needed_headroom &&
279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
280 dev_kfree_skb(skb);
281 return NULL;
282 }
283 } else {
284 /*
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
287 */
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
289
290 origskb = remove_monitor_info(local, origskb);
291
292 if (!skb)
293 return origskb;
294 }
295
296 /* prepend radiotap information */
297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
298 true);
299
300 skb_reset_mac_header(skb);
301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 skb->pkt_type = PACKET_OTHERHOST;
303 skb->protocol = htons(ETH_P_802_2);
304
305 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
306 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
307 continue;
308
309 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
310 continue;
311
312 if (!ieee80211_sdata_running(sdata))
313 continue;
314
315 if (prev_dev) {
316 skb2 = skb_clone(skb, GFP_ATOMIC);
317 if (skb2) {
318 skb2->dev = prev_dev;
319 netif_receive_skb(skb2);
320 }
321 }
322
323 prev_dev = sdata->dev;
324 sdata->dev->stats.rx_packets++;
325 sdata->dev->stats.rx_bytes += skb->len;
326 }
327
328 if (prev_dev) {
329 skb->dev = prev_dev;
330 netif_receive_skb(skb);
331 } else
332 dev_kfree_skb(skb);
333
334 return origskb;
335}
336
337
338static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
339{
340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
342 int tid, seqno_idx, security_idx;
343
344 /* does the frame have a qos control field? */
345 if (ieee80211_is_data_qos(hdr->frame_control)) {
346 u8 *qc = ieee80211_get_qos_ctl(hdr);
347 /* frame has qos control */
348 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
349 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
350 status->rx_flags |= IEEE80211_RX_AMSDU;
351
352 seqno_idx = tid;
353 security_idx = tid;
354 } else {
355 /*
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 *
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
363 *
364 * We also use that counter for non-QoS STAs.
365 */
366 seqno_idx = NUM_RX_DATA_QUEUES;
367 security_idx = 0;
368 if (ieee80211_is_mgmt(hdr->frame_control))
369 security_idx = NUM_RX_DATA_QUEUES;
370 tid = 0;
371 }
372
373 rx->seqno_idx = seqno_idx;
374 rx->security_idx = security_idx;
375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx->skb->priority = (tid > 7) ? 0 : tid;
378}
379
380/**
381 * DOC: Packet alignment
382 *
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
384 * to the stack.
385 *
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
394 *
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
400 *
401 * Padding like Atheros hardware adds which is between the 802.11 header and
402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
404 */
405static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
406{
407#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx->skb->data & 1,
409 "unaligned packet at 0x%p\n", rx->skb->data);
410#endif
411}
412
413
414/* rx handlers */
415
416static ieee80211_rx_result debug_noinline
417ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
418{
419 struct ieee80211_local *local = rx->local;
420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
421 struct sk_buff *skb = rx->skb;
422
423 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
424 !local->sched_scanning))
425 return RX_CONTINUE;
426
427 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
428 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
429 local->sched_scanning)
430 return ieee80211_scan_rx(rx->sdata, skb);
431
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
438static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
439{
440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
441
442 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
443 return 0;
444
445 return ieee80211_is_robust_mgmt_frame(hdr);
446}
447
448
449static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
450{
451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
452
453 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
454 return 0;
455
456 return ieee80211_is_robust_mgmt_frame(hdr);
457}
458
459
460/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
461static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
462{
463 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
464 struct ieee80211_mmie *mmie;
465
466 if (skb->len < 24 + sizeof(*mmie) ||
467 !is_multicast_ether_addr(hdr->da))
468 return -1;
469
470 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
471 return -1; /* not a robust management frame */
472
473 mmie = (struct ieee80211_mmie *)
474 (skb->data + skb->len - sizeof(*mmie));
475 if (mmie->element_id != WLAN_EID_MMIE ||
476 mmie->length != sizeof(*mmie) - 2)
477 return -1;
478
479 return le16_to_cpu(mmie->key_id);
480}
481
482
483static ieee80211_rx_result
484ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
485{
486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
487 char *dev_addr = rx->sdata->vif.addr;
488
489 if (ieee80211_is_data(hdr->frame_control)) {
490 if (is_multicast_ether_addr(hdr->addr1)) {
491 if (ieee80211_has_tods(hdr->frame_control) ||
492 !ieee80211_has_fromds(hdr->frame_control))
493 return RX_DROP_MONITOR;
494 if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
495 return RX_DROP_MONITOR;
496 } else {
497 if (!ieee80211_has_a4(hdr->frame_control))
498 return RX_DROP_MONITOR;
499 if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
500 return RX_DROP_MONITOR;
501 }
502 }
503
504 /* If there is not an established peer link and this is not a peer link
505 * establisment frame, beacon or probe, drop the frame.
506 */
507
508 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
509 struct ieee80211_mgmt *mgmt;
510
511 if (!ieee80211_is_mgmt(hdr->frame_control))
512 return RX_DROP_MONITOR;
513
514 if (ieee80211_is_action(hdr->frame_control)) {
515 u8 category;
516
517 /* make sure category field is present */
518 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
519 return RX_DROP_MONITOR;
520
521 mgmt = (struct ieee80211_mgmt *)hdr;
522 category = mgmt->u.action.category;
523 if (category != WLAN_CATEGORY_MESH_ACTION &&
524 category != WLAN_CATEGORY_SELF_PROTECTED)
525 return RX_DROP_MONITOR;
526 return RX_CONTINUE;
527 }
528
529 if (ieee80211_is_probe_req(hdr->frame_control) ||
530 ieee80211_is_probe_resp(hdr->frame_control) ||
531 ieee80211_is_beacon(hdr->frame_control) ||
532 ieee80211_is_auth(hdr->frame_control))
533 return RX_CONTINUE;
534
535 return RX_DROP_MONITOR;
536
537 }
538
539 return RX_CONTINUE;
540}
541
542#define SEQ_MODULO 0x1000
543#define SEQ_MASK 0xfff
544
545static inline int seq_less(u16 sq1, u16 sq2)
546{
547 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
548}
549
550static inline u16 seq_inc(u16 sq)
551{
552 return (sq + 1) & SEQ_MASK;
553}
554
555static inline u16 seq_sub(u16 sq1, u16 sq2)
556{
557 return (sq1 - sq2) & SEQ_MASK;
558}
559
560
561static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
562 struct tid_ampdu_rx *tid_agg_rx,
563 int index)
564{
565 struct ieee80211_local *local = hw_to_local(hw);
566 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
567 struct ieee80211_rx_status *status;
568
569 lockdep_assert_held(&tid_agg_rx->reorder_lock);
570
571 if (!skb)
572 goto no_frame;
573
574 /* release the frame from the reorder ring buffer */
575 tid_agg_rx->stored_mpdu_num--;
576 tid_agg_rx->reorder_buf[index] = NULL;
577 status = IEEE80211_SKB_RXCB(skb);
578 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
579 skb_queue_tail(&local->rx_skb_queue, skb);
580
581no_frame:
582 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
583}
584
585static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
586 struct tid_ampdu_rx *tid_agg_rx,
587 u16 head_seq_num)
588{
589 int index;
590
591 lockdep_assert_held(&tid_agg_rx->reorder_lock);
592
593 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
594 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
595 tid_agg_rx->buf_size;
596 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
597 }
598}
599
600/*
601 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
602 * the skb was added to the buffer longer than this time ago, the earlier
603 * frames that have not yet been received are assumed to be lost and the skb
604 * can be released for processing. This may also release other skb's from the
605 * reorder buffer if there are no additional gaps between the frames.
606 *
607 * Callers must hold tid_agg_rx->reorder_lock.
608 */
609#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
610
611static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
612 struct tid_ampdu_rx *tid_agg_rx)
613{
614 int index, j;
615
616 lockdep_assert_held(&tid_agg_rx->reorder_lock);
617
618 /* release the buffer until next missing frame */
619 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
620 tid_agg_rx->buf_size;
621 if (!tid_agg_rx->reorder_buf[index] &&
622 tid_agg_rx->stored_mpdu_num) {
623 /*
624 * No buffers ready to be released, but check whether any
625 * frames in the reorder buffer have timed out.
626 */
627 int skipped = 1;
628 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
629 j = (j + 1) % tid_agg_rx->buf_size) {
630 if (!tid_agg_rx->reorder_buf[j]) {
631 skipped++;
632 continue;
633 }
634 if (skipped &&
635 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
636 HT_RX_REORDER_BUF_TIMEOUT))
637 goto set_release_timer;
638
639#ifdef CONFIG_MAC80211_HT_DEBUG
640 if (net_ratelimit())
641 wiphy_debug(hw->wiphy,
642 "release an RX reorder frame due to timeout on earlier frames\n");
643#endif
644 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
645
646 /*
647 * Increment the head seq# also for the skipped slots.
648 */
649 tid_agg_rx->head_seq_num =
650 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
651 skipped = 0;
652 }
653 } else while (tid_agg_rx->reorder_buf[index]) {
654 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
655 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
656 tid_agg_rx->buf_size;
657 }
658
659 if (tid_agg_rx->stored_mpdu_num) {
660 j = index = seq_sub(tid_agg_rx->head_seq_num,
661 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
662
663 for (; j != (index - 1) % tid_agg_rx->buf_size;
664 j = (j + 1) % tid_agg_rx->buf_size) {
665 if (tid_agg_rx->reorder_buf[j])
666 break;
667 }
668
669 set_release_timer:
670
671 if (!tid_agg_rx->removed)
672 mod_timer(&tid_agg_rx->reorder_timer,
673 tid_agg_rx->reorder_time[j] + 1 +
674 HT_RX_REORDER_BUF_TIMEOUT);
675 } else {
676 del_timer(&tid_agg_rx->reorder_timer);
677 }
678}
679
680/*
681 * As this function belongs to the RX path it must be under
682 * rcu_read_lock protection. It returns false if the frame
683 * can be processed immediately, true if it was consumed.
684 */
685static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
686 struct tid_ampdu_rx *tid_agg_rx,
687 struct sk_buff *skb)
688{
689 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
690 u16 sc = le16_to_cpu(hdr->seq_ctrl);
691 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
692 u16 head_seq_num, buf_size;
693 int index;
694 bool ret = true;
695
696 spin_lock(&tid_agg_rx->reorder_lock);
697
698 buf_size = tid_agg_rx->buf_size;
699 head_seq_num = tid_agg_rx->head_seq_num;
700
701 /* frame with out of date sequence number */
702 if (seq_less(mpdu_seq_num, head_seq_num)) {
703 dev_kfree_skb(skb);
704 goto out;
705 }
706
707 /*
708 * If frame the sequence number exceeds our buffering window
709 * size release some previous frames to make room for this one.
710 */
711 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
712 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
713 /* release stored frames up to new head to stack */
714 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
715 }
716
717 /* Now the new frame is always in the range of the reordering buffer */
718
719 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
720
721 /* check if we already stored this frame */
722 if (tid_agg_rx->reorder_buf[index]) {
723 dev_kfree_skb(skb);
724 goto out;
725 }
726
727 /*
728 * If the current MPDU is in the right order and nothing else
729 * is stored we can process it directly, no need to buffer it.
730 * If it is first but there's something stored, we may be able
731 * to release frames after this one.
732 */
733 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
734 tid_agg_rx->stored_mpdu_num == 0) {
735 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
736 ret = false;
737 goto out;
738 }
739
740 /* put the frame in the reordering buffer */
741 tid_agg_rx->reorder_buf[index] = skb;
742 tid_agg_rx->reorder_time[index] = jiffies;
743 tid_agg_rx->stored_mpdu_num++;
744 ieee80211_sta_reorder_release(hw, tid_agg_rx);
745
746 out:
747 spin_unlock(&tid_agg_rx->reorder_lock);
748 return ret;
749}
750
751/*
752 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
753 * true if the MPDU was buffered, false if it should be processed.
754 */
755static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
756{
757 struct sk_buff *skb = rx->skb;
758 struct ieee80211_local *local = rx->local;
759 struct ieee80211_hw *hw = &local->hw;
760 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
761 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
762 struct sta_info *sta = rx->sta;
763 struct tid_ampdu_rx *tid_agg_rx;
764 u16 sc;
765 u8 tid, ack_policy;
766
767 if (!ieee80211_is_data_qos(hdr->frame_control) ||
768 is_multicast_ether_addr(hdr->addr1))
769 goto dont_reorder;
770
771 /*
772 * filter the QoS data rx stream according to
773 * STA/TID and check if this STA/TID is on aggregation
774 */
775
776 if (!sta)
777 goto dont_reorder;
778
779 ack_policy = *ieee80211_get_qos_ctl(hdr) &
780 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
781 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
782
783 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
784 if (!tid_agg_rx)
785 goto dont_reorder;
786
787 /* qos null data frames are excluded */
788 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
789 goto dont_reorder;
790
791 /* not part of a BA session */
792 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
793 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
794 goto dont_reorder;
795
796 /* not actually part of this BA session */
797 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
798 goto dont_reorder;
799
800 /* new, potentially un-ordered, ampdu frame - process it */
801
802 /* reset session timer */
803 if (tid_agg_rx->timeout)
804 mod_timer(&tid_agg_rx->session_timer,
805 TU_TO_EXP_TIME(tid_agg_rx->timeout));
806
807 /* if this mpdu is fragmented - terminate rx aggregation session */
808 sc = le16_to_cpu(hdr->seq_ctrl);
809 if (sc & IEEE80211_SCTL_FRAG) {
810 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
811 skb_queue_tail(&rx->sdata->skb_queue, skb);
812 ieee80211_queue_work(&local->hw, &rx->sdata->work);
813 return;
814 }
815
816 /*
817 * No locking needed -- we will only ever process one
818 * RX packet at a time, and thus own tid_agg_rx. All
819 * other code manipulating it needs to (and does) make
820 * sure that we cannot get to it any more before doing
821 * anything with it.
822 */
823 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
824 return;
825
826 dont_reorder:
827 skb_queue_tail(&local->rx_skb_queue, skb);
828}
829
830static ieee80211_rx_result debug_noinline
831ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
832{
833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
834 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
835
836 /*
837 * Drop duplicate 802.11 retransmissions
838 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
839 */
840 if (rx->skb->len >= 24 && rx->sta &&
841 !ieee80211_is_ctl(hdr->frame_control) &&
842 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
843 !is_multicast_ether_addr(hdr->addr1)) {
844 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
845 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
846 hdr->seq_ctrl)) {
847 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
848 rx->local->dot11FrameDuplicateCount++;
849 rx->sta->num_duplicates++;
850 }
851 return RX_DROP_UNUSABLE;
852 } else
853 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
854 }
855
856 if (unlikely(rx->skb->len < 16)) {
857 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
858 return RX_DROP_MONITOR;
859 }
860
861 /* Drop disallowed frame classes based on STA auth/assoc state;
862 * IEEE 802.11, Chap 5.5.
863 *
864 * mac80211 filters only based on association state, i.e. it drops
865 * Class 3 frames from not associated stations. hostapd sends
866 * deauth/disassoc frames when needed. In addition, hostapd is
867 * responsible for filtering on both auth and assoc states.
868 */
869
870 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
871 return ieee80211_rx_mesh_check(rx);
872
873 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
874 ieee80211_is_pspoll(hdr->frame_control)) &&
875 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
876 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
877 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
878 /*
879 * accept port control frames from the AP even when it's not
880 * yet marked ASSOC to prevent a race where we don't set the
881 * assoc bit quickly enough before it sends the first frame
882 */
883 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
884 ieee80211_is_data_present(hdr->frame_control)) {
885 unsigned int hdrlen;
886 __be16 ethertype;
887
888 hdrlen = ieee80211_hdrlen(hdr->frame_control);
889
890 if (rx->skb->len < hdrlen + 8)
891 return RX_DROP_MONITOR;
892
893 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
894 if (ethertype == rx->sdata->control_port_protocol)
895 return RX_CONTINUE;
896 }
897
898 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
899 cfg80211_rx_spurious_frame(rx->sdata->dev,
900 hdr->addr2,
901 GFP_ATOMIC))
902 return RX_DROP_UNUSABLE;
903
904 return RX_DROP_MONITOR;
905 }
906
907 return RX_CONTINUE;
908}
909
910
911static ieee80211_rx_result debug_noinline
912ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
913{
914 struct sk_buff *skb = rx->skb;
915 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
916 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
917 int keyidx;
918 int hdrlen;
919 ieee80211_rx_result result = RX_DROP_UNUSABLE;
920 struct ieee80211_key *sta_ptk = NULL;
921 int mmie_keyidx = -1;
922 __le16 fc;
923
924 /*
925 * Key selection 101
926 *
927 * There are four types of keys:
928 * - GTK (group keys)
929 * - IGTK (group keys for management frames)
930 * - PTK (pairwise keys)
931 * - STK (station-to-station pairwise keys)
932 *
933 * When selecting a key, we have to distinguish between multicast
934 * (including broadcast) and unicast frames, the latter can only
935 * use PTKs and STKs while the former always use GTKs and IGTKs.
936 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
937 * unicast frames can also use key indices like GTKs. Hence, if we
938 * don't have a PTK/STK we check the key index for a WEP key.
939 *
940 * Note that in a regular BSS, multicast frames are sent by the
941 * AP only, associated stations unicast the frame to the AP first
942 * which then multicasts it on their behalf.
943 *
944 * There is also a slight problem in IBSS mode: GTKs are negotiated
945 * with each station, that is something we don't currently handle.
946 * The spec seems to expect that one negotiates the same key with
947 * every station but there's no such requirement; VLANs could be
948 * possible.
949 */
950
951 /*
952 * No point in finding a key and decrypting if the frame is neither
953 * addressed to us nor a multicast frame.
954 */
955 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
956 return RX_CONTINUE;
957
958 /* start without a key */
959 rx->key = NULL;
960
961 if (rx->sta)
962 sta_ptk = rcu_dereference(rx->sta->ptk);
963
964 fc = hdr->frame_control;
965
966 if (!ieee80211_has_protected(fc))
967 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
968
969 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
970 rx->key = sta_ptk;
971 if ((status->flag & RX_FLAG_DECRYPTED) &&
972 (status->flag & RX_FLAG_IV_STRIPPED))
973 return RX_CONTINUE;
974 /* Skip decryption if the frame is not protected. */
975 if (!ieee80211_has_protected(fc))
976 return RX_CONTINUE;
977 } else if (mmie_keyidx >= 0) {
978 /* Broadcast/multicast robust management frame / BIP */
979 if ((status->flag & RX_FLAG_DECRYPTED) &&
980 (status->flag & RX_FLAG_IV_STRIPPED))
981 return RX_CONTINUE;
982
983 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
984 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
985 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
986 if (rx->sta)
987 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
988 if (!rx->key)
989 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
990 } else if (!ieee80211_has_protected(fc)) {
991 /*
992 * The frame was not protected, so skip decryption. However, we
993 * need to set rx->key if there is a key that could have been
994 * used so that the frame may be dropped if encryption would
995 * have been expected.
996 */
997 struct ieee80211_key *key = NULL;
998 struct ieee80211_sub_if_data *sdata = rx->sdata;
999 int i;
1000
1001 if (ieee80211_is_mgmt(fc) &&
1002 is_multicast_ether_addr(hdr->addr1) &&
1003 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1004 rx->key = key;
1005 else {
1006 if (rx->sta) {
1007 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1008 key = rcu_dereference(rx->sta->gtk[i]);
1009 if (key)
1010 break;
1011 }
1012 }
1013 if (!key) {
1014 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1015 key = rcu_dereference(sdata->keys[i]);
1016 if (key)
1017 break;
1018 }
1019 }
1020 if (key)
1021 rx->key = key;
1022 }
1023 return RX_CONTINUE;
1024 } else {
1025 u8 keyid;
1026 /*
1027 * The device doesn't give us the IV so we won't be
1028 * able to look up the key. That's ok though, we
1029 * don't need to decrypt the frame, we just won't
1030 * be able to keep statistics accurate.
1031 * Except for key threshold notifications, should
1032 * we somehow allow the driver to tell us which key
1033 * the hardware used if this flag is set?
1034 */
1035 if ((status->flag & RX_FLAG_DECRYPTED) &&
1036 (status->flag & RX_FLAG_IV_STRIPPED))
1037 return RX_CONTINUE;
1038
1039 hdrlen = ieee80211_hdrlen(fc);
1040
1041 if (rx->skb->len < 8 + hdrlen)
1042 return RX_DROP_UNUSABLE; /* TODO: count this? */
1043
1044 /*
1045 * no need to call ieee80211_wep_get_keyidx,
1046 * it verifies a bunch of things we've done already
1047 */
1048 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1049 keyidx = keyid >> 6;
1050
1051 /* check per-station GTK first, if multicast packet */
1052 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1053 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1054
1055 /* if not found, try default key */
1056 if (!rx->key) {
1057 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1058
1059 /*
1060 * RSNA-protected unicast frames should always be
1061 * sent with pairwise or station-to-station keys,
1062 * but for WEP we allow using a key index as well.
1063 */
1064 if (rx->key &&
1065 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1066 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1067 !is_multicast_ether_addr(hdr->addr1))
1068 rx->key = NULL;
1069 }
1070 }
1071
1072 if (rx->key) {
1073 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1074 return RX_DROP_MONITOR;
1075
1076 rx->key->tx_rx_count++;
1077 /* TODO: add threshold stuff again */
1078 } else {
1079 return RX_DROP_MONITOR;
1080 }
1081
1082 switch (rx->key->conf.cipher) {
1083 case WLAN_CIPHER_SUITE_WEP40:
1084 case WLAN_CIPHER_SUITE_WEP104:
1085 result = ieee80211_crypto_wep_decrypt(rx);
1086 break;
1087 case WLAN_CIPHER_SUITE_TKIP:
1088 result = ieee80211_crypto_tkip_decrypt(rx);
1089 break;
1090 case WLAN_CIPHER_SUITE_CCMP:
1091 result = ieee80211_crypto_ccmp_decrypt(rx);
1092 break;
1093 case WLAN_CIPHER_SUITE_AES_CMAC:
1094 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1095 break;
1096 default:
1097 /*
1098 * We can reach here only with HW-only algorithms
1099 * but why didn't it decrypt the frame?!
1100 */
1101 return RX_DROP_UNUSABLE;
1102 }
1103
1104 /* the hdr variable is invalid after the decrypt handlers */
1105
1106 /* either the frame has been decrypted or will be dropped */
1107 status->flag |= RX_FLAG_DECRYPTED;
1108
1109 return result;
1110}
1111
1112static ieee80211_rx_result debug_noinline
1113ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1114{
1115 struct ieee80211_local *local;
1116 struct ieee80211_hdr *hdr;
1117 struct sk_buff *skb;
1118
1119 local = rx->local;
1120 skb = rx->skb;
1121 hdr = (struct ieee80211_hdr *) skb->data;
1122
1123 if (!local->pspolling)
1124 return RX_CONTINUE;
1125
1126 if (!ieee80211_has_fromds(hdr->frame_control))
1127 /* this is not from AP */
1128 return RX_CONTINUE;
1129
1130 if (!ieee80211_is_data(hdr->frame_control))
1131 return RX_CONTINUE;
1132
1133 if (!ieee80211_has_moredata(hdr->frame_control)) {
1134 /* AP has no more frames buffered for us */
1135 local->pspolling = false;
1136 return RX_CONTINUE;
1137 }
1138
1139 /* more data bit is set, let's request a new frame from the AP */
1140 ieee80211_send_pspoll(local, rx->sdata);
1141
1142 return RX_CONTINUE;
1143}
1144
1145static void ap_sta_ps_start(struct sta_info *sta)
1146{
1147 struct ieee80211_sub_if_data *sdata = sta->sdata;
1148 struct ieee80211_local *local = sdata->local;
1149
1150 atomic_inc(&sdata->bss->num_sta_ps);
1151 set_sta_flag(sta, WLAN_STA_PS_STA);
1152 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1153 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1154#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1155 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
1156 sdata->name, sta->sta.addr, sta->sta.aid);
1157#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1158}
1159
1160static void ap_sta_ps_end(struct sta_info *sta)
1161{
1162#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1163 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
1164 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1165#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1166
1167 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1168#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1169 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
1170 sta->sdata->name, sta->sta.addr, sta->sta.aid);
1171#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1172 return;
1173 }
1174
1175 ieee80211_sta_ps_deliver_wakeup(sta);
1176}
1177
1178int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1179{
1180 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1181 bool in_ps;
1182
1183 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1184
1185 /* Don't let the same PS state be set twice */
1186 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1187 if ((start && in_ps) || (!start && !in_ps))
1188 return -EINVAL;
1189
1190 if (start)
1191 ap_sta_ps_start(sta_inf);
1192 else
1193 ap_sta_ps_end(sta_inf);
1194
1195 return 0;
1196}
1197EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1198
1199static ieee80211_rx_result debug_noinline
1200ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1201{
1202 struct ieee80211_sub_if_data *sdata = rx->sdata;
1203 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1204 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1205 int tid, ac;
1206
1207 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1208 return RX_CONTINUE;
1209
1210 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1211 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1212 return RX_CONTINUE;
1213
1214 /*
1215 * The device handles station powersave, so don't do anything about
1216 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1217 * it to mac80211 since they're handled.)
1218 */
1219 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1220 return RX_CONTINUE;
1221
1222 /*
1223 * Don't do anything if the station isn't already asleep. In
1224 * the uAPSD case, the station will probably be marked asleep,
1225 * in the PS-Poll case the station must be confused ...
1226 */
1227 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1228 return RX_CONTINUE;
1229
1230 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1231 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1232 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1233 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1234 else
1235 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1236 }
1237
1238 /* Free PS Poll skb here instead of returning RX_DROP that would
1239 * count as an dropped frame. */
1240 dev_kfree_skb(rx->skb);
1241
1242 return RX_QUEUED;
1243 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1244 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1245 ieee80211_has_pm(hdr->frame_control) &&
1246 (ieee80211_is_data_qos(hdr->frame_control) ||
1247 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1248 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1249 ac = ieee802_1d_to_ac[tid & 7];
1250
1251 /*
1252 * If this AC is not trigger-enabled do nothing.
1253 *
1254 * NB: This could/should check a separate bitmap of trigger-
1255 * enabled queues, but for now we only implement uAPSD w/o
1256 * TSPEC changes to the ACs, so they're always the same.
1257 */
1258 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1259 return RX_CONTINUE;
1260
1261 /* if we are in a service period, do nothing */
1262 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1263 return RX_CONTINUE;
1264
1265 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1266 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1267 else
1268 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1269 }
1270
1271 return RX_CONTINUE;
1272}
1273
1274static ieee80211_rx_result debug_noinline
1275ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1276{
1277 struct sta_info *sta = rx->sta;
1278 struct sk_buff *skb = rx->skb;
1279 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1281
1282 if (!sta)
1283 return RX_CONTINUE;
1284
1285 /*
1286 * Update last_rx only for IBSS packets which are for the current
1287 * BSSID to avoid keeping the current IBSS network alive in cases
1288 * where other STAs start using different BSSID.
1289 */
1290 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1291 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1292 NL80211_IFTYPE_ADHOC);
1293 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
1294 sta->last_rx = jiffies;
1295 if (ieee80211_is_data(hdr->frame_control)) {
1296 sta->last_rx_rate_idx = status->rate_idx;
1297 sta->last_rx_rate_flag = status->flag;
1298 }
1299 }
1300 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1301 /*
1302 * Mesh beacons will update last_rx when if they are found to
1303 * match the current local configuration when processed.
1304 */
1305 sta->last_rx = jiffies;
1306 if (ieee80211_is_data(hdr->frame_control)) {
1307 sta->last_rx_rate_idx = status->rate_idx;
1308 sta->last_rx_rate_flag = status->flag;
1309 }
1310 }
1311
1312 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1313 return RX_CONTINUE;
1314
1315 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1316 ieee80211_sta_rx_notify(rx->sdata, hdr);
1317
1318 sta->rx_fragments++;
1319 sta->rx_bytes += rx->skb->len;
1320 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1321 sta->last_signal = status->signal;
1322 ewma_add(&sta->avg_signal, -status->signal);
1323 }
1324
1325 /*
1326 * Change STA power saving mode only at the end of a frame
1327 * exchange sequence.
1328 */
1329 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1330 !ieee80211_has_morefrags(hdr->frame_control) &&
1331 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1332 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1333 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
1334 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1335 /*
1336 * Ignore doze->wake transitions that are
1337 * indicated by non-data frames, the standard
1338 * is unclear here, but for example going to
1339 * PS mode and then scanning would cause a
1340 * doze->wake transition for the probe request,
1341 * and that is clearly undesirable.
1342 */
1343 if (ieee80211_is_data(hdr->frame_control) &&
1344 !ieee80211_has_pm(hdr->frame_control))
1345 ap_sta_ps_end(sta);
1346 } else {
1347 if (ieee80211_has_pm(hdr->frame_control))
1348 ap_sta_ps_start(sta);
1349 }
1350 }
1351
1352 /*
1353 * Drop (qos-)data::nullfunc frames silently, since they
1354 * are used only to control station power saving mode.
1355 */
1356 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1357 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1359
1360 /*
1361 * If we receive a 4-addr nullfunc frame from a STA
1362 * that was not moved to a 4-addr STA vlan yet send
1363 * the event to userspace and for older hostapd drop
1364 * the frame to the monitor interface.
1365 */
1366 if (ieee80211_has_a4(hdr->frame_control) &&
1367 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1368 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1369 !rx->sdata->u.vlan.sta))) {
1370 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1371 cfg80211_rx_unexpected_4addr_frame(
1372 rx->sdata->dev, sta->sta.addr,
1373 GFP_ATOMIC);
1374 return RX_DROP_MONITOR;
1375 }
1376 /*
1377 * Update counter and free packet here to avoid
1378 * counting this as a dropped packed.
1379 */
1380 sta->rx_packets++;
1381 dev_kfree_skb(rx->skb);
1382 return RX_QUEUED;
1383 }
1384
1385 return RX_CONTINUE;
1386} /* ieee80211_rx_h_sta_process */
1387
1388static inline struct ieee80211_fragment_entry *
1389ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1390 unsigned int frag, unsigned int seq, int rx_queue,
1391 struct sk_buff **skb)
1392{
1393 struct ieee80211_fragment_entry *entry;
1394 int idx;
1395
1396 idx = sdata->fragment_next;
1397 entry = &sdata->fragments[sdata->fragment_next++];
1398 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1399 sdata->fragment_next = 0;
1400
1401 if (!skb_queue_empty(&entry->skb_list)) {
1402#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1403 struct ieee80211_hdr *hdr =
1404 (struct ieee80211_hdr *) entry->skb_list.next->data;
1405 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1406 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
1407 "addr1=%pM addr2=%pM\n",
1408 sdata->name, idx,
1409 jiffies - entry->first_frag_time, entry->seq,
1410 entry->last_frag, hdr->addr1, hdr->addr2);
1411#endif
1412 __skb_queue_purge(&entry->skb_list);
1413 }
1414
1415 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1416 *skb = NULL;
1417 entry->first_frag_time = jiffies;
1418 entry->seq = seq;
1419 entry->rx_queue = rx_queue;
1420 entry->last_frag = frag;
1421 entry->ccmp = 0;
1422 entry->extra_len = 0;
1423
1424 return entry;
1425}
1426
1427static inline struct ieee80211_fragment_entry *
1428ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1429 unsigned int frag, unsigned int seq,
1430 int rx_queue, struct ieee80211_hdr *hdr)
1431{
1432 struct ieee80211_fragment_entry *entry;
1433 int i, idx;
1434
1435 idx = sdata->fragment_next;
1436 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1437 struct ieee80211_hdr *f_hdr;
1438
1439 idx--;
1440 if (idx < 0)
1441 idx = IEEE80211_FRAGMENT_MAX - 1;
1442
1443 entry = &sdata->fragments[idx];
1444 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1445 entry->rx_queue != rx_queue ||
1446 entry->last_frag + 1 != frag)
1447 continue;
1448
1449 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1450
1451 /*
1452 * Check ftype and addresses are equal, else check next fragment
1453 */
1454 if (((hdr->frame_control ^ f_hdr->frame_control) &
1455 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1456 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1457 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1458 continue;
1459
1460 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1461 __skb_queue_purge(&entry->skb_list);
1462 continue;
1463 }
1464 return entry;
1465 }
1466
1467 return NULL;
1468}
1469
1470static ieee80211_rx_result debug_noinline
1471ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1472{
1473 struct ieee80211_hdr *hdr;
1474 u16 sc;
1475 __le16 fc;
1476 unsigned int frag, seq;
1477 struct ieee80211_fragment_entry *entry;
1478 struct sk_buff *skb;
1479 struct ieee80211_rx_status *status;
1480
1481 hdr = (struct ieee80211_hdr *)rx->skb->data;
1482 fc = hdr->frame_control;
1483
1484 if (ieee80211_is_ctl(fc))
1485 return RX_CONTINUE;
1486
1487 sc = le16_to_cpu(hdr->seq_ctrl);
1488 frag = sc & IEEE80211_SCTL_FRAG;
1489
1490 if (is_multicast_ether_addr(hdr->addr1)) {
1491 rx->local->dot11MulticastReceivedFrameCount++;
1492 goto out_no_led;
1493 }
1494
1495 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1496 goto out;
1497
1498 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1499
1500 if (skb_linearize(rx->skb))
1501 return RX_DROP_UNUSABLE;
1502
1503 /*
1504 * skb_linearize() might change the skb->data and
1505 * previously cached variables (in this case, hdr) need to
1506 * be refreshed with the new data.
1507 */
1508 hdr = (struct ieee80211_hdr *)rx->skb->data;
1509 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1510
1511 if (frag == 0) {
1512 /* This is the first fragment of a new frame. */
1513 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1514 rx->seqno_idx, &(rx->skb));
1515 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1516 ieee80211_has_protected(fc)) {
1517 int queue = rx->security_idx;
1518 /* Store CCMP PN so that we can verify that the next
1519 * fragment has a sequential PN value. */
1520 entry->ccmp = 1;
1521 memcpy(entry->last_pn,
1522 rx->key->u.ccmp.rx_pn[queue],
1523 CCMP_PN_LEN);
1524 }
1525 return RX_QUEUED;
1526 }
1527
1528 /* This is a fragment for a frame that should already be pending in
1529 * fragment cache. Add this fragment to the end of the pending entry.
1530 */
1531 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1532 rx->seqno_idx, hdr);
1533 if (!entry) {
1534 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1535 return RX_DROP_MONITOR;
1536 }
1537
1538 /* Verify that MPDUs within one MSDU have sequential PN values.
1539 * (IEEE 802.11i, 8.3.3.4.5) */
1540 if (entry->ccmp) {
1541 int i;
1542 u8 pn[CCMP_PN_LEN], *rpn;
1543 int queue;
1544 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1545 return RX_DROP_UNUSABLE;
1546 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1547 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1548 pn[i]++;
1549 if (pn[i])
1550 break;
1551 }
1552 queue = rx->security_idx;
1553 rpn = rx->key->u.ccmp.rx_pn[queue];
1554 if (memcmp(pn, rpn, CCMP_PN_LEN))
1555 return RX_DROP_UNUSABLE;
1556 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1557 }
1558
1559 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1560 __skb_queue_tail(&entry->skb_list, rx->skb);
1561 entry->last_frag = frag;
1562 entry->extra_len += rx->skb->len;
1563 if (ieee80211_has_morefrags(fc)) {
1564 rx->skb = NULL;
1565 return RX_QUEUED;
1566 }
1567
1568 rx->skb = __skb_dequeue(&entry->skb_list);
1569 if (skb_tailroom(rx->skb) < entry->extra_len) {
1570 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1571 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1572 GFP_ATOMIC))) {
1573 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1574 __skb_queue_purge(&entry->skb_list);
1575 return RX_DROP_UNUSABLE;
1576 }
1577 }
1578 while ((skb = __skb_dequeue(&entry->skb_list))) {
1579 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1580 dev_kfree_skb(skb);
1581 }
1582
1583 /* Complete frame has been reassembled - process it now */
1584 status = IEEE80211_SKB_RXCB(rx->skb);
1585 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1586
1587 out:
1588 ieee80211_led_rx(rx->local);
1589 out_no_led:
1590 if (rx->sta)
1591 rx->sta->rx_packets++;
1592 return RX_CONTINUE;
1593}
1594
1595static int
1596ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1597{
1598 if (unlikely(!rx->sta ||
1599 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1600 return -EACCES;
1601
1602 return 0;
1603}
1604
1605static int
1606ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1607{
1608 struct sk_buff *skb = rx->skb;
1609 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1610
1611 /*
1612 * Pass through unencrypted frames if the hardware has
1613 * decrypted them already.
1614 */
1615 if (status->flag & RX_FLAG_DECRYPTED)
1616 return 0;
1617
1618 /* Drop unencrypted frames if key is set. */
1619 if (unlikely(!ieee80211_has_protected(fc) &&
1620 !ieee80211_is_nullfunc(fc) &&
1621 ieee80211_is_data(fc) &&
1622 (rx->key || rx->sdata->drop_unencrypted)))
1623 return -EACCES;
1624
1625 return 0;
1626}
1627
1628static int
1629ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1630{
1631 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1632 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1633 __le16 fc = hdr->frame_control;
1634
1635 /*
1636 * Pass through unencrypted frames if the hardware has
1637 * decrypted them already.
1638 */
1639 if (status->flag & RX_FLAG_DECRYPTED)
1640 return 0;
1641
1642 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1643 if (unlikely(!ieee80211_has_protected(fc) &&
1644 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1645 rx->key)) {
1646 if (ieee80211_is_deauth(fc))
1647 cfg80211_send_unprot_deauth(rx->sdata->dev,
1648 rx->skb->data,
1649 rx->skb->len);
1650 else if (ieee80211_is_disassoc(fc))
1651 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1652 rx->skb->data,
1653 rx->skb->len);
1654 return -EACCES;
1655 }
1656 /* BIP does not use Protected field, so need to check MMIE */
1657 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1658 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1659 if (ieee80211_is_deauth(fc))
1660 cfg80211_send_unprot_deauth(rx->sdata->dev,
1661 rx->skb->data,
1662 rx->skb->len);
1663 else if (ieee80211_is_disassoc(fc))
1664 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1665 rx->skb->data,
1666 rx->skb->len);
1667 return -EACCES;
1668 }
1669 /*
1670 * When using MFP, Action frames are not allowed prior to
1671 * having configured keys.
1672 */
1673 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1674 ieee80211_is_robust_mgmt_frame(
1675 (struct ieee80211_hdr *) rx->skb->data)))
1676 return -EACCES;
1677 }
1678
1679 return 0;
1680}
1681
1682static int
1683__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1684{
1685 struct ieee80211_sub_if_data *sdata = rx->sdata;
1686 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1687 bool check_port_control = false;
1688 struct ethhdr *ehdr;
1689 int ret;
1690
1691 *port_control = false;
1692 if (ieee80211_has_a4(hdr->frame_control) &&
1693 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1694 return -1;
1695
1696 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1697 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1698
1699 if (!sdata->u.mgd.use_4addr)
1700 return -1;
1701 else
1702 check_port_control = true;
1703 }
1704
1705 if (is_multicast_ether_addr(hdr->addr1) &&
1706 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1707 return -1;
1708
1709 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1710 if (ret < 0)
1711 return ret;
1712
1713 ehdr = (struct ethhdr *) rx->skb->data;
1714 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1715 *port_control = true;
1716 else if (check_port_control)
1717 return -1;
1718
1719 return 0;
1720}
1721
1722/*
1723 * requires that rx->skb is a frame with ethernet header
1724 */
1725static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1726{
1727 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1728 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1729 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1730
1731 /*
1732 * Allow EAPOL frames to us/the PAE group address regardless
1733 * of whether the frame was encrypted or not.
1734 */
1735 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1736 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
1737 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1738 return true;
1739
1740 if (ieee80211_802_1x_port_control(rx) ||
1741 ieee80211_drop_unencrypted(rx, fc))
1742 return false;
1743
1744 return true;
1745}
1746
1747/*
1748 * requires that rx->skb is a frame with ethernet header
1749 */
1750static void
1751ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1752{
1753 struct ieee80211_sub_if_data *sdata = rx->sdata;
1754 struct net_device *dev = sdata->dev;
1755 struct sk_buff *skb, *xmit_skb;
1756 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1757 struct sta_info *dsta;
1758 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1759
1760 skb = rx->skb;
1761 xmit_skb = NULL;
1762
1763 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1764 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1765 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1766 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1767 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1768 if (is_multicast_ether_addr(ehdr->h_dest)) {
1769 /*
1770 * send multicast frames both to higher layers in
1771 * local net stack and back to the wireless medium
1772 */
1773 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1774 if (!xmit_skb && net_ratelimit())
1775 printk(KERN_DEBUG "%s: failed to clone "
1776 "multicast frame\n", dev->name);
1777 } else {
1778 dsta = sta_info_get(sdata, skb->data);
1779 if (dsta) {
1780 /*
1781 * The destination station is associated to
1782 * this AP (in this VLAN), so send the frame
1783 * directly to it and do not pass it to local
1784 * net stack.
1785 */
1786 xmit_skb = skb;
1787 skb = NULL;
1788 }
1789 }
1790 }
1791
1792 if (skb) {
1793 int align __maybe_unused;
1794
1795#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1796 /*
1797 * 'align' will only take the values 0 or 2 here
1798 * since all frames are required to be aligned
1799 * to 2-byte boundaries when being passed to
1800 * mac80211. That also explains the __skb_push()
1801 * below.
1802 */
1803 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
1804 if (align) {
1805 if (WARN_ON(skb_headroom(skb) < 3)) {
1806 dev_kfree_skb(skb);
1807 skb = NULL;
1808 } else {
1809 u8 *data = skb->data;
1810 size_t len = skb_headlen(skb);
1811 skb->data -= align;
1812 memmove(skb->data, data, len);
1813 skb_set_tail_pointer(skb, len);
1814 }
1815 }
1816#endif
1817
1818 if (skb) {
1819 /* deliver to local stack */
1820 skb->protocol = eth_type_trans(skb, dev);
1821 memset(skb->cb, 0, sizeof(skb->cb));
1822#if 1
1823 clean_cache(skb_mac_header(skb), skb->len + skb->data - skb_mac_header(skb));
1824 int ret;
1825 extern int (*fast_from_driver)(struct sk_buff *skb, struct net_device *dev);
1826 if (fast_from_driver) {
1827 skb->data -= 14;
1828 skb->len += 14;
1829 if(((unsigned int)skb->data) % 4 == 0)
1830 {
1831 memmove(skb->data - 2, skb->data, skb->len);
1832 skb->data = skb->data - 2;
1833 }
1834
1835 ret = fast_from_driver(skb,dev);
1836 if(!ret)
1837 {
1838 skb->data += 14;
1839 skb->len -= 14;
1840 netif_receive_skb(skb);
1841 }
1842 } else {
1843#endif
1844 netif_receive_skb(skb);
1845 }
1846 }
1847 }
1848
1849 if (xmit_skb) {
1850 /*
1851 * Send to wireless media and increase priority by 256 to
1852 * keep the received priority instead of reclassifying
1853 * the frame (see cfg80211_classify8021d).
1854 */
1855 xmit_skb->priority += 256;
1856 xmit_skb->protocol = htons(ETH_P_802_3);
1857 skb_reset_network_header(xmit_skb);
1858 skb_reset_mac_header(xmit_skb);
1859 dev_queue_xmit(xmit_skb);
1860 }
1861}
1862
1863static ieee80211_rx_result debug_noinline
1864ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
1865{
1866 struct net_device *dev = rx->sdata->dev;
1867 struct sk_buff *skb = rx->skb;
1868 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1869 __le16 fc = hdr->frame_control;
1870 struct sk_buff_head frame_list;
1871 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1872
1873 if (unlikely(!ieee80211_is_data(fc)))
1874 return RX_CONTINUE;
1875
1876 if (unlikely(!ieee80211_is_data_present(fc)))
1877 return RX_DROP_MONITOR;
1878
1879 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
1880 return RX_CONTINUE;
1881
1882 if (ieee80211_has_a4(hdr->frame_control) &&
1883 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1884 !rx->sdata->u.vlan.sta)
1885 return RX_DROP_UNUSABLE;
1886
1887 if (is_multicast_ether_addr(hdr->addr1) &&
1888 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1889 rx->sdata->u.vlan.sta) ||
1890 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1891 rx->sdata->u.mgd.use_4addr)))
1892 return RX_DROP_UNUSABLE;
1893
1894 skb->dev = dev;
1895 __skb_queue_head_init(&frame_list);
1896
1897 if (skb_linearize(skb))
1898 return RX_DROP_UNUSABLE;
1899
1900 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1901 rx->sdata->vif.type,
1902 rx->local->hw.extra_tx_headroom, true);
1903
1904 while (!skb_queue_empty(&frame_list)) {
1905 rx->skb = __skb_dequeue(&frame_list);
1906
1907 if (!ieee80211_frame_allowed(rx, fc)) {
1908 dev_kfree_skb(rx->skb);
1909 continue;
1910 }
1911 dev->stats.rx_packets++;
1912 dev->stats.rx_bytes += rx->skb->len;
1913
1914 ieee80211_deliver_skb(rx);
1915 }
1916
1917 return RX_QUEUED;
1918}
1919
1920#ifdef CONFIG_MAC80211_MESH
1921static ieee80211_rx_result
1922ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1923{
1924 struct ieee80211_hdr *fwd_hdr, *hdr;
1925 struct ieee80211_tx_info *info;
1926 struct ieee80211s_hdr *mesh_hdr;
1927 struct sk_buff *skb = rx->skb, *fwd_skb;
1928 struct ieee80211_local *local = rx->local;
1929 struct ieee80211_sub_if_data *sdata = rx->sdata;
1930 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1931 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1932 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
1933 u16 q, hdrlen;
1934
1935 hdr = (struct ieee80211_hdr *) skb->data;
1936 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1937
1938 /* make sure fixed part of mesh header is there, also checks skb len */
1939 if (!pskb_may_pull(rx->skb, hdrlen + 6))
1940 return RX_DROP_MONITOR;
1941
1942 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1943
1944 /* make sure full mesh header is there, also checks skb len */
1945 if (!pskb_may_pull(rx->skb,
1946 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1947 return RX_DROP_MONITOR;
1948
1949 /* reload pointers */
1950 hdr = (struct ieee80211_hdr *) skb->data;
1951 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1952
1953 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
1954 return RX_DROP_MONITOR;
1955
1956 /* frame is in RMC, don't forward */
1957 if (ieee80211_is_data(hdr->frame_control) &&
1958 is_multicast_ether_addr(hdr->addr1) &&
1959 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1960 return RX_DROP_MONITOR;
1961
1962 if (!ieee80211_is_data(hdr->frame_control) ||
1963 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1964 return RX_CONTINUE;
1965
1966 if (!mesh_hdr->ttl)
1967 return RX_DROP_MONITOR;
1968
1969 if (mesh_hdr->flags & MESH_FLAGS_AE) {
1970 struct mesh_path *mppath;
1971 char *proxied_addr;
1972 char *mpp_addr;
1973
1974 if (is_multicast_ether_addr(hdr->addr1)) {
1975 mpp_addr = hdr->addr3;
1976 proxied_addr = mesh_hdr->eaddr1;
1977 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1978 /* has_a4 already checked in ieee80211_rx_mesh_check */
1979 mpp_addr = hdr->addr4;
1980 proxied_addr = mesh_hdr->eaddr2;
1981 } else {
1982 return RX_DROP_MONITOR;
1983 }
1984
1985 rcu_read_lock();
1986 mppath = mpp_path_lookup(proxied_addr, sdata);
1987 if (!mppath) {
1988 mpp_path_add(proxied_addr, mpp_addr, sdata);
1989 } else {
1990 spin_lock_bh(&mppath->state_lock);
1991 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1992 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1993 spin_unlock_bh(&mppath->state_lock);
1994 }
1995 rcu_read_unlock();
1996 }
1997
1998 /* Frame has reached destination. Don't forward */
1999 if (!is_multicast_ether_addr(hdr->addr1) &&
2000 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
2001 return RX_CONTINUE;
2002
2003 q = ieee80211_select_queue_80211(local, skb, hdr);
2004 if (ieee80211_queue_stopped(&local->hw, q)) {
2005 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2006 return RX_DROP_MONITOR;
2007 }
2008 skb_set_queue_mapping(skb, q);
2009
2010 if (!--mesh_hdr->ttl) {
2011 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2012 return RX_DROP_MONITOR;
2013 }
2014
2015 if (!ifmsh->mshcfg.dot11MeshForwarding)
2016 goto out;
2017
2018 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2019 if (!fwd_skb) {
2020 if (net_ratelimit())
2021 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
2022 sdata->name);
2023 goto out;
2024 }
2025
2026 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2027 info = IEEE80211_SKB_CB(fwd_skb);
2028 memset(info, 0, sizeof(*info));
2029 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2030 info->control.vif = &rx->sdata->vif;
2031 info->control.jiffies = jiffies;
2032 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2033 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2034 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2035 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
2036 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2037 } else {
2038 /* unable to resolve next hop */
2039 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
2040 0, reason, fwd_hdr->addr2, sdata);
2041 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2042 kfree_skb(fwd_skb);
2043 return RX_DROP_MONITOR;
2044 }
2045
2046 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2047 ieee80211_add_pending_skb(local, fwd_skb);
2048 out:
2049 if (is_multicast_ether_addr(hdr->addr1) ||
2050 sdata->dev->flags & IFF_PROMISC)
2051 return RX_CONTINUE;
2052 else
2053 return RX_DROP_MONITOR;
2054}
2055#endif
2056
2057static ieee80211_rx_result debug_noinline
2058ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2059{
2060 struct ieee80211_sub_if_data *sdata = rx->sdata;
2061 struct ieee80211_local *local = rx->local;
2062 struct net_device *dev = sdata->dev;
2063 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2064 __le16 fc = hdr->frame_control;
2065 bool port_control;
2066 int err;
2067
2068 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2069 return RX_CONTINUE;
2070
2071 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2072 return RX_DROP_MONITOR;
2073
2074 /*
2075 * Send unexpected-4addr-frame event to hostapd. For older versions,
2076 * also drop the frame to cooked monitor interfaces.
2077 */
2078 if (ieee80211_has_a4(hdr->frame_control) &&
2079 sdata->vif.type == NL80211_IFTYPE_AP) {
2080 if (rx->sta &&
2081 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2082 cfg80211_rx_unexpected_4addr_frame(
2083 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2084 return RX_DROP_MONITOR;
2085 }
2086
2087 err = __ieee80211_data_to_8023(rx, &port_control);
2088 if (unlikely(err))
2089 return RX_DROP_UNUSABLE;
2090
2091 if (!ieee80211_frame_allowed(rx, fc))
2092 return RX_DROP_MONITOR;
2093
2094 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2095 unlikely(port_control) && sdata->bss) {
2096 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2097 u.ap);
2098 dev = sdata->dev;
2099 rx->sdata = sdata;
2100 }
2101
2102 rx->skb->dev = dev;
2103
2104 dev->stats.rx_packets++;
2105 dev->stats.rx_bytes += rx->skb->len;
2106
2107 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2108 !is_multicast_ether_addr(
2109 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2110 (!local->scanning &&
2111 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2112 mod_timer(&local->dynamic_ps_timer, jiffies +
2113 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2114 }
2115
2116 ieee80211_deliver_skb(rx);
2117
2118 return RX_QUEUED;
2119}
2120
2121static ieee80211_rx_result debug_noinline
2122ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
2123{
2124 struct ieee80211_local *local = rx->local;
2125 struct ieee80211_hw *hw = &local->hw;
2126 struct sk_buff *skb = rx->skb;
2127 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2128 struct tid_ampdu_rx *tid_agg_rx;
2129 u16 start_seq_num;
2130 u16 tid;
2131
2132 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2133 return RX_CONTINUE;
2134
2135 if (ieee80211_is_back_req(bar->frame_control)) {
2136 struct {
2137 __le16 control, start_seq_num;
2138 } __packed bar_data;
2139
2140 if (!rx->sta)
2141 return RX_DROP_MONITOR;
2142
2143 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2144 &bar_data, sizeof(bar_data)))
2145 return RX_DROP_MONITOR;
2146
2147 tid = le16_to_cpu(bar_data.control) >> 12;
2148
2149 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2150 if (!tid_agg_rx)
2151 return RX_DROP_MONITOR;
2152
2153 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2154
2155 /* reset session timer */
2156 if (tid_agg_rx->timeout)
2157 mod_timer(&tid_agg_rx->session_timer,
2158 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2159
2160 spin_lock(&tid_agg_rx->reorder_lock);
2161 /* release stored frames up to start of BAR */
2162 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
2163 spin_unlock(&tid_agg_rx->reorder_lock);
2164
2165 kfree_skb(skb);
2166 return RX_QUEUED;
2167 }
2168
2169 /*
2170 * After this point, we only want management frames,
2171 * so we can drop all remaining control frames to
2172 * cooked monitor interfaces.
2173 */
2174 return RX_DROP_MONITOR;
2175}
2176
2177static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2178 struct ieee80211_mgmt *mgmt,
2179 size_t len)
2180{
2181 struct ieee80211_local *local = sdata->local;
2182 struct sk_buff *skb;
2183 struct ieee80211_mgmt *resp;
2184
2185 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
2186 /* Not to own unicast address */
2187 return;
2188 }
2189
2190 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2191 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
2192 /* Not from the current AP or not associated yet. */
2193 return;
2194 }
2195
2196 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2197 /* Too short SA Query request frame */
2198 return;
2199 }
2200
2201 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2202 if (skb == NULL)
2203 return;
2204
2205 skb_reserve(skb, local->hw.extra_tx_headroom);
2206 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2207 memset(resp, 0, 24);
2208 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2209 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2210 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2211 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2212 IEEE80211_STYPE_ACTION);
2213 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2214 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2215 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2216 memcpy(resp->u.action.u.sa_query.trans_id,
2217 mgmt->u.action.u.sa_query.trans_id,
2218 WLAN_SA_QUERY_TR_ID_LEN);
2219
2220 ieee80211_tx_skb(sdata, skb);
2221}
2222
2223static ieee80211_rx_result debug_noinline
2224ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2225{
2226 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2227 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2228
2229 /*
2230 * From here on, look only at management frames.
2231 * Data and control frames are already handled,
2232 * and unknown (reserved) frames are useless.
2233 */
2234 if (rx->skb->len < 24)
2235 return RX_DROP_MONITOR;
2236
2237 if (!ieee80211_is_mgmt(mgmt->frame_control))
2238 return RX_DROP_MONITOR;
2239
2240 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2241 ieee80211_is_beacon(mgmt->frame_control) &&
2242 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2243 int sig = 0;
2244
2245 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2246 sig = status->signal;
2247
2248 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2249 rx->skb->data, rx->skb->len,
2250 status->freq, sig, GFP_ATOMIC);
2251 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2252 }
2253
2254 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2255 return RX_DROP_MONITOR;
2256
2257 if (ieee80211_drop_unencrypted_mgmt(rx))
2258 return RX_DROP_UNUSABLE;
2259
2260 return RX_CONTINUE;
2261}
2262
2263static ieee80211_rx_result debug_noinline
2264ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2265{
2266 struct ieee80211_local *local = rx->local;
2267 struct ieee80211_sub_if_data *sdata = rx->sdata;
2268 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2269 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2270 int len = rx->skb->len;
2271
2272 if (!ieee80211_is_action(mgmt->frame_control))
2273 return RX_CONTINUE;
2274
2275 /* drop too small frames */
2276 if (len < IEEE80211_MIN_ACTION_SIZE)
2277 return RX_DROP_UNUSABLE;
2278
2279 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
2280 return RX_DROP_UNUSABLE;
2281
2282 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2283 return RX_DROP_UNUSABLE;
2284
2285 switch (mgmt->u.action.category) {
2286 case WLAN_CATEGORY_HT:
2287 /* reject HT action frames from stations not supporting HT */
2288 if (!rx->sta->sta.ht_cap.ht_supported)
2289 goto invalid;
2290
2291 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2292 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2293 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2294 sdata->vif.type != NL80211_IFTYPE_AP &&
2295 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2296 break;
2297
2298 /* verify action & smps_control are present */
2299 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2300 goto invalid;
2301
2302 switch (mgmt->u.action.u.ht_smps.action) {
2303 case WLAN_HT_ACTION_SMPS: {
2304 struct ieee80211_supported_band *sband;
2305 u8 smps;
2306
2307 /* convert to HT capability */
2308 switch (mgmt->u.action.u.ht_smps.smps_control) {
2309 case WLAN_HT_SMPS_CONTROL_DISABLED:
2310 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2311 break;
2312 case WLAN_HT_SMPS_CONTROL_STATIC:
2313 smps = WLAN_HT_CAP_SM_PS_STATIC;
2314 break;
2315 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2316 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2317 break;
2318 default:
2319 goto invalid;
2320 }
2321 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2322
2323 /* if no change do nothing */
2324 if ((rx->sta->sta.ht_cap.cap &
2325 IEEE80211_HT_CAP_SM_PS) == smps)
2326 goto handled;
2327
2328 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2329 rx->sta->sta.ht_cap.cap |= smps;
2330
2331 sband = rx->local->hw.wiphy->bands[status->band];
2332
2333 rate_control_rate_update(
2334 local, sband, rx->sta,
2335 IEEE80211_RC_SMPS_CHANGED,
2336 ieee80211_get_tx_channel_type(
2337 local, local->_oper_channel_type));
2338 goto handled;
2339 }
2340 default:
2341 goto invalid;
2342 }
2343
2344 break;
2345 case WLAN_CATEGORY_BACK:
2346 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2347 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2348 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2349 sdata->vif.type != NL80211_IFTYPE_AP &&
2350 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2351 break;
2352
2353 /* verify action_code is present */
2354 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2355 break;
2356
2357 switch (mgmt->u.action.u.addba_req.action_code) {
2358 case WLAN_ACTION_ADDBA_REQ:
2359 if (len < (IEEE80211_MIN_ACTION_SIZE +
2360 sizeof(mgmt->u.action.u.addba_req)))
2361 goto invalid;
2362 break;
2363 case WLAN_ACTION_ADDBA_RESP:
2364 if (len < (IEEE80211_MIN_ACTION_SIZE +
2365 sizeof(mgmt->u.action.u.addba_resp)))
2366 goto invalid;
2367 break;
2368 case WLAN_ACTION_DELBA:
2369 if (len < (IEEE80211_MIN_ACTION_SIZE +
2370 sizeof(mgmt->u.action.u.delba)))
2371 goto invalid;
2372 break;
2373 default:
2374 goto invalid;
2375 }
2376
2377 goto queue;
2378 case WLAN_CATEGORY_SPECTRUM_MGMT:
2379 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2380 break;
2381
2382 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2383 break;
2384
2385 /* verify action_code is present */
2386 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2387 break;
2388
2389 switch (mgmt->u.action.u.measurement.action_code) {
2390 case WLAN_ACTION_SPCT_MSR_REQ:
2391 if (len < (IEEE80211_MIN_ACTION_SIZE +
2392 sizeof(mgmt->u.action.u.measurement)))
2393 break;
2394 ieee80211_process_measurement_req(sdata, mgmt, len);
2395 goto handled;
2396 case WLAN_ACTION_SPCT_CHL_SWITCH:
2397 if (len < (IEEE80211_MIN_ACTION_SIZE +
2398 sizeof(mgmt->u.action.u.chan_switch)))
2399 break;
2400
2401 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2402 break;
2403
2404 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
2405 break;
2406
2407 goto queue;
2408 }
2409 break;
2410 case WLAN_CATEGORY_SA_QUERY:
2411 if (len < (IEEE80211_MIN_ACTION_SIZE +
2412 sizeof(mgmt->u.action.u.sa_query)))
2413 break;
2414
2415 switch (mgmt->u.action.u.sa_query.action) {
2416 case WLAN_ACTION_SA_QUERY_REQUEST:
2417 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2418 break;
2419 ieee80211_process_sa_query_req(sdata, mgmt, len);
2420 goto handled;
2421 }
2422 break;
2423 case WLAN_CATEGORY_SELF_PROTECTED:
2424 if (len < (IEEE80211_MIN_ACTION_SIZE +
2425 sizeof(mgmt->u.action.u.self_prot.action_code)))
2426 break;
2427
2428 switch (mgmt->u.action.u.self_prot.action_code) {
2429 case WLAN_SP_MESH_PEERING_OPEN:
2430 case WLAN_SP_MESH_PEERING_CLOSE:
2431 case WLAN_SP_MESH_PEERING_CONFIRM:
2432 if (!ieee80211_vif_is_mesh(&sdata->vif))
2433 goto invalid;
2434 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2435 /* userspace handles this frame */
2436 break;
2437 goto queue;
2438 case WLAN_SP_MGK_INFORM:
2439 case WLAN_SP_MGK_ACK:
2440 if (!ieee80211_vif_is_mesh(&sdata->vif))
2441 goto invalid;
2442 break;
2443 }
2444 break;
2445 case WLAN_CATEGORY_MESH_ACTION:
2446 if (len < (IEEE80211_MIN_ACTION_SIZE +
2447 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2448 break;
2449
2450 if (!ieee80211_vif_is_mesh(&sdata->vif))
2451 break;
2452 if (mesh_action_is_path_sel(mgmt) &&
2453 (!mesh_path_sel_is_hwmp(sdata)))
2454 break;
2455 goto queue;
2456 }
2457
2458 return RX_CONTINUE;
2459
2460 invalid:
2461 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2462 /* will return in the next handlers */
2463 return RX_CONTINUE;
2464
2465 handled:
2466 if (rx->sta)
2467 rx->sta->rx_packets++;
2468 dev_kfree_skb(rx->skb);
2469 return RX_QUEUED;
2470
2471 queue:
2472 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2473 skb_queue_tail(&sdata->skb_queue, rx->skb);
2474 ieee80211_queue_work(&local->hw, &sdata->work);
2475 if (rx->sta)
2476 rx->sta->rx_packets++;
2477 return RX_QUEUED;
2478}
2479
2480static ieee80211_rx_result debug_noinline
2481ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2482{
2483 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2484 int sig = 0;
2485
2486 /* skip known-bad action frames and return them in the next handler */
2487 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2488 return RX_CONTINUE;
2489
2490 /*
2491 * Getting here means the kernel doesn't know how to handle
2492 * it, but maybe userspace does ... include returned frames
2493 * so userspace can register for those to know whether ones
2494 * it transmitted were processed or returned.
2495 */
2496
2497 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2498 sig = status->signal;
2499
2500 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2501 rx->skb->data, rx->skb->len,
2502 GFP_ATOMIC)) {
2503 if (rx->sta)
2504 rx->sta->rx_packets++;
2505 dev_kfree_skb(rx->skb);
2506 return RX_QUEUED;
2507 }
2508
2509
2510 return RX_CONTINUE;
2511}
2512
2513static ieee80211_rx_result debug_noinline
2514ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2515{
2516 struct ieee80211_local *local = rx->local;
2517 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2518 struct sk_buff *nskb;
2519 struct ieee80211_sub_if_data *sdata = rx->sdata;
2520 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2521
2522 if (!ieee80211_is_action(mgmt->frame_control))
2523 return RX_CONTINUE;
2524
2525 /*
2526 * For AP mode, hostapd is responsible for handling any action
2527 * frames that we didn't handle, including returning unknown
2528 * ones. For all other modes we will return them to the sender,
2529 * setting the 0x80 bit in the action category, as required by
2530 * 802.11-2012 9.24.4.
2531 * Newer versions of hostapd shall also use the management frame
2532 * registration mechanisms, but older ones still use cooked
2533 * monitor interfaces so push all frames there.
2534 */
2535 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2536 (sdata->vif.type == NL80211_IFTYPE_AP ||
2537 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2538 return RX_DROP_MONITOR;
2539
2540 if (is_multicast_ether_addr(mgmt->da))
2541 return RX_DROP_MONITOR;
2542
2543 /* do not return rejected action frames */
2544 if (mgmt->u.action.category & 0x80)
2545 return RX_DROP_UNUSABLE;
2546
2547 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2548 GFP_ATOMIC);
2549 if (nskb) {
2550 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2551
2552 nmgmt->u.action.category |= 0x80;
2553 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2554 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2555
2556 memset(nskb->cb, 0, sizeof(nskb->cb));
2557
2558 ieee80211_tx_skb(rx->sdata, nskb);
2559 }
2560 dev_kfree_skb(rx->skb);
2561 return RX_QUEUED;
2562}
2563
2564static ieee80211_rx_result debug_noinline
2565ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2566{
2567 struct ieee80211_sub_if_data *sdata = rx->sdata;
2568 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2569 __le16 stype;
2570
2571 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2572
2573 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2574 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2575 sdata->vif.type != NL80211_IFTYPE_STATION)
2576 return RX_DROP_MONITOR;
2577
2578 switch (stype) {
2579 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2580 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2581 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2582 /* process for all: mesh, mlme, ibss */
2583 break;
2584 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2585 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2586 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2587 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2588 if (is_multicast_ether_addr(mgmt->da) &&
2589 !is_broadcast_ether_addr(mgmt->da))
2590 return RX_DROP_MONITOR;
2591
2592 /* process only for station */
2593 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2594 return RX_DROP_MONITOR;
2595 break;
2596 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2597 /* process only for ibss */
2598 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2599 return RX_DROP_MONITOR;
2600 break;
2601 default:
2602 return RX_DROP_MONITOR;
2603 }
2604
2605 /* queue up frame and kick off work to process it */
2606 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2607 skb_queue_tail(&sdata->skb_queue, rx->skb);
2608 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2609 if (rx->sta)
2610 rx->sta->rx_packets++;
2611
2612 return RX_QUEUED;
2613}
2614
2615/* TODO: use IEEE80211_RX_FRAGMENTED */
2616static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2617 struct ieee80211_rate *rate)
2618{
2619 struct ieee80211_sub_if_data *sdata;
2620 struct ieee80211_local *local = rx->local;
2621 struct sk_buff *skb = rx->skb, *skb2;
2622 struct net_device *prev_dev = NULL;
2623 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2624 int needed_headroom;
2625
2626 /*
2627 * If cooked monitor has been processed already, then
2628 * don't do it again. If not, set the flag.
2629 */
2630 if (rx->flags & IEEE80211_RX_CMNTR)
2631 goto out_free_skb;
2632 rx->flags |= IEEE80211_RX_CMNTR;
2633
2634 /* If there are no cooked monitor interfaces, just free the SKB */
2635 if (!local->cooked_mntrs)
2636 goto out_free_skb;
2637
2638 /* room for the radiotap header based on driver features */
2639 needed_headroom = ieee80211_rx_radiotap_len(local, status);
2640
2641 if (skb_headroom(skb) < needed_headroom &&
2642 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2643 goto out_free_skb;
2644
2645 /* prepend radiotap information */
2646 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2647 false);
2648
2649 skb_set_mac_header(skb, 0);
2650 skb->ip_summed = CHECKSUM_UNNECESSARY;
2651 skb->pkt_type = PACKET_OTHERHOST;
2652 skb->protocol = htons(ETH_P_802_2);
2653
2654 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2655 if (!ieee80211_sdata_running(sdata))
2656 continue;
2657
2658 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2659 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2660 continue;
2661
2662 if (prev_dev) {
2663 skb2 = skb_clone(skb, GFP_ATOMIC);
2664 if (skb2) {
2665 skb2->dev = prev_dev;
2666 netif_receive_skb(skb2);
2667 }
2668 }
2669
2670 prev_dev = sdata->dev;
2671 sdata->dev->stats.rx_packets++;
2672 sdata->dev->stats.rx_bytes += skb->len;
2673 }
2674
2675 if (prev_dev) {
2676 skb->dev = prev_dev;
2677 netif_receive_skb(skb);
2678 return;
2679 }
2680
2681 out_free_skb:
2682 dev_kfree_skb(skb);
2683}
2684
2685static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2686 ieee80211_rx_result res)
2687{
2688 switch (res) {
2689 case RX_DROP_MONITOR:
2690 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2691 if (rx->sta)
2692 rx->sta->rx_dropped++;
2693 /* fall through */
2694 case RX_CONTINUE: {
2695 struct ieee80211_rate *rate = NULL;
2696 struct ieee80211_supported_band *sband;
2697 struct ieee80211_rx_status *status;
2698
2699 status = IEEE80211_SKB_RXCB((rx->skb));
2700
2701 sband = rx->local->hw.wiphy->bands[status->band];
2702 if (!(status->flag & RX_FLAG_HT))
2703 rate = &sband->bitrates[status->rate_idx];
2704
2705 ieee80211_rx_cooked_monitor(rx, rate);
2706 break;
2707 }
2708 case RX_DROP_UNUSABLE:
2709 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2710 if (rx->sta)
2711 rx->sta->rx_dropped++;
2712 dev_kfree_skb(rx->skb);
2713 break;
2714 case RX_QUEUED:
2715 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2716 break;
2717 }
2718}
2719
2720static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
2721{
2722 ieee80211_rx_result res = RX_DROP_MONITOR;
2723 struct sk_buff *skb;
2724
2725#define CALL_RXH(rxh) \
2726 do { \
2727 res = rxh(rx); \
2728 if (res != RX_CONTINUE) \
2729 goto rxh_next; \
2730 } while (0);
2731
2732 spin_lock(&rx->local->rx_skb_queue.lock);
2733 if (rx->local->running_rx_handler)
2734 goto unlock;
2735
2736 rx->local->running_rx_handler = true;
2737
2738 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2739 spin_unlock(&rx->local->rx_skb_queue.lock);
2740
2741 /*
2742 * all the other fields are valid across frames
2743 * that belong to an aMPDU since they are on the
2744 * same TID from the same station
2745 */
2746 rx->skb = skb;
2747
2748 CALL_RXH(ieee80211_rx_h_decrypt)
2749 CALL_RXH(ieee80211_rx_h_check_more_data)
2750 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2751 CALL_RXH(ieee80211_rx_h_sta_process)
2752 CALL_RXH(ieee80211_rx_h_defragment)
2753 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2754 /* must be after MMIC verify so header is counted in MPDU mic */
2755#ifdef CONFIG_MAC80211_MESH
2756 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2757 CALL_RXH(ieee80211_rx_h_mesh_fwding);
2758#endif
2759 CALL_RXH(ieee80211_rx_h_amsdu)
2760 CALL_RXH(ieee80211_rx_h_data)
2761 CALL_RXH(ieee80211_rx_h_ctrl);
2762 CALL_RXH(ieee80211_rx_h_mgmt_check)
2763 CALL_RXH(ieee80211_rx_h_action)
2764 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2765 CALL_RXH(ieee80211_rx_h_action_return)
2766 CALL_RXH(ieee80211_rx_h_mgmt)
2767
2768 rxh_next:
2769 ieee80211_rx_handlers_result(rx, res);
2770 spin_lock(&rx->local->rx_skb_queue.lock);
2771#undef CALL_RXH
2772 }
2773
2774 rx->local->running_rx_handler = false;
2775
2776 unlock:
2777 spin_unlock(&rx->local->rx_skb_queue.lock);
2778}
2779
2780static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
2781{
2782 ieee80211_rx_result res = RX_DROP_MONITOR;
2783
2784#define CALL_RXH(rxh) \
2785 do { \
2786 res = rxh(rx); \
2787 if (res != RX_CONTINUE) \
2788 goto rxh_next; \
2789 } while (0);
2790
2791 CALL_RXH(ieee80211_rx_h_passive_scan)
2792 CALL_RXH(ieee80211_rx_h_check)
2793
2794 ieee80211_rx_reorder_ampdu(rx);
2795
2796 ieee80211_rx_handlers(rx);
2797 return;
2798
2799 rxh_next:
2800 ieee80211_rx_handlers_result(rx, res);
2801
2802#undef CALL_RXH
2803}
2804
2805/*
2806 * This function makes calls into the RX path, therefore
2807 * it has to be invoked under RCU read lock.
2808 */
2809void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2810{
2811 struct ieee80211_rx_data rx = {
2812 .sta = sta,
2813 .sdata = sta->sdata,
2814 .local = sta->local,
2815 /* This is OK -- must be QoS data frame */
2816 .security_idx = tid,
2817 .seqno_idx = tid,
2818 .flags = 0,
2819 };
2820 struct tid_ampdu_rx *tid_agg_rx;
2821
2822 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2823 if (!tid_agg_rx)
2824 return;
2825
2826 spin_lock(&tid_agg_rx->reorder_lock);
2827 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2828 spin_unlock(&tid_agg_rx->reorder_lock);
2829
2830 ieee80211_rx_handlers(&rx);
2831}
2832
2833/* main receive path */
2834
2835static int prepare_for_handlers(struct ieee80211_rx_data *rx,
2836 struct ieee80211_hdr *hdr)
2837{
2838 struct ieee80211_sub_if_data *sdata = rx->sdata;
2839 struct sk_buff *skb = rx->skb;
2840 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2841 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
2842 int multicast = is_multicast_ether_addr(hdr->addr1);
2843
2844 switch (sdata->vif.type) {
2845 case NL80211_IFTYPE_STATION:
2846 if (!bssid && !sdata->u.mgd.use_4addr)
2847 return 0;
2848 if (!multicast &&
2849 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
2850 if (!(sdata->dev->flags & IFF_PROMISC) ||
2851 sdata->u.mgd.use_4addr)
2852 return 0;
2853 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2854 }
2855 break;
2856 case NL80211_IFTYPE_ADHOC:
2857 if (!bssid)
2858 return 0;
2859 if (compare_ether_addr(sdata->vif.addr, hdr->addr2) == 0 ||
2860 compare_ether_addr(sdata->u.ibss.bssid, hdr->addr2) == 0)
2861 return 0;
2862 if (ieee80211_is_beacon(hdr->frame_control)) {
2863 return 1;
2864 }
2865 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2866 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
2867 return 0;
2868 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2869 } else if (!multicast &&
2870 compare_ether_addr(sdata->vif.addr,
2871 hdr->addr1) != 0) {
2872 if (!(sdata->dev->flags & IFF_PROMISC))
2873 return 0;
2874 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2875 } else if (!rx->sta) {
2876 int rate_idx;
2877 if (status->flag & RX_FLAG_HT)
2878 rate_idx = 0; /* TODO: HT rates */
2879 else
2880 rate_idx = status->rate_idx;
2881 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2882 BIT(rate_idx));
2883 }
2884 break;
2885 case NL80211_IFTYPE_MESH_POINT:
2886 if (!multicast &&
2887 compare_ether_addr(sdata->vif.addr,
2888 hdr->addr1) != 0) {
2889 if (!(sdata->dev->flags & IFF_PROMISC))
2890 return 0;
2891
2892 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2893 }
2894 break;
2895 case NL80211_IFTYPE_AP_VLAN:
2896 case NL80211_IFTYPE_AP:
2897 if (!bssid) {
2898 if (compare_ether_addr(sdata->vif.addr,
2899 hdr->addr1))
2900 return 0;
2901 } else if (!ieee80211_bssid_match(bssid,
2902 sdata->vif.addr)) {
2903 /*
2904 * Accept public action frames even when the
2905 * BSSID doesn't match, this is used for P2P
2906 * and location updates. Note that mac80211
2907 * itself never looks at these frames.
2908 */
2909 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2910 ieee80211_is_public_action(hdr, skb->len))
2911 return 1;
2912 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2913 !ieee80211_is_beacon(hdr->frame_control))
2914 return 0;
2915 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2916 }
2917 break;
2918 case NL80211_IFTYPE_WDS:
2919 if (bssid || !ieee80211_is_data(hdr->frame_control))
2920 return 0;
2921 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2922 return 0;
2923 break;
2924 default:
2925 /* should never get here */
2926 WARN_ON(1);
2927 break;
2928 }
2929
2930 return 1;
2931}
2932
2933/*
2934 * This function returns whether or not the SKB
2935 * was destined for RX processing or not, which,
2936 * if consume is true, is equivalent to whether
2937 * or not the skb was consumed.
2938 */
2939static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2940 struct sk_buff *skb, bool consume)
2941{
2942 struct ieee80211_local *local = rx->local;
2943 struct ieee80211_sub_if_data *sdata = rx->sdata;
2944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2945 struct ieee80211_hdr *hdr = (void *)skb->data;
2946 int prepares;
2947
2948 rx->skb = skb;
2949 status->rx_flags |= IEEE80211_RX_RA_MATCH;
2950 prepares = prepare_for_handlers(rx, hdr);
2951
2952 if (!prepares)
2953 return false;
2954
2955 if (!consume) {
2956 skb = skb_copy(skb, GFP_ATOMIC);
2957 if (!skb) {
2958 if (net_ratelimit())
2959 wiphy_debug(local->hw.wiphy,
2960 "failed to copy skb for %s\n",
2961 sdata->name);
2962 return true;
2963 }
2964
2965 rx->skb = skb;
2966 }
2967
2968 ieee80211_invoke_rx_handlers(rx);
2969 return true;
2970}
2971
2972/*
2973 * This is the actual Rx frames handler. as it blongs to Rx path it must
2974 * be called with rcu_read_lock protection.
2975 */
2976static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2977 struct sk_buff *skb)
2978{
2979 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2980 struct ieee80211_local *local = hw_to_local(hw);
2981 struct ieee80211_sub_if_data *sdata;
2982 struct ieee80211_hdr *hdr;
2983 __le16 fc;
2984 struct ieee80211_rx_data rx;
2985 struct ieee80211_sub_if_data *prev;
2986 struct sta_info *sta, *tmp, *prev_sta;
2987 int err = 0;
2988
2989 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
2990 memset(&rx, 0, sizeof(rx));
2991 rx.skb = skb;
2992 rx.local = local;
2993
2994 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
2995 local->dot11ReceivedFragmentCount++;
2996
2997 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2998 test_bit(SCAN_SW_SCANNING, &local->scanning)))
2999 status->rx_flags |= IEEE80211_RX_IN_SCAN;
3000
3001 if (ieee80211_is_mgmt(fc)) {
3002 /* drop frame if too short for header */
3003 if (skb->len < ieee80211_hdrlen(fc))
3004 err = -ENOBUFS;
3005 else
3006 err = skb_linearize(skb);
3007 } else {
3008 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3009 }
3010
3011 if (err) {
3012 dev_kfree_skb(skb);
3013 return;
3014 }
3015
3016 hdr = (struct ieee80211_hdr *)skb->data;
3017 ieee80211_parse_qos(&rx);
3018 ieee80211_verify_alignment(&rx);
3019
3020 if (ieee80211_is_data(fc)) {
3021 prev_sta = NULL;
3022
3023 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3024 if (!prev_sta) {
3025 prev_sta = sta;
3026 continue;
3027 }
3028
3029 rx.sta = prev_sta;
3030 rx.sdata = prev_sta->sdata;
3031 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3032
3033 prev_sta = sta;
3034 }
3035
3036 if (prev_sta) {
3037 rx.sta = prev_sta;
3038 rx.sdata = prev_sta->sdata;
3039
3040 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3041 return;
3042 goto out;
3043 }
3044 }
3045
3046 prev = NULL;
3047
3048 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3049 if (!ieee80211_sdata_running(sdata))
3050 continue;
3051
3052 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3053 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3054 continue;
3055
3056 /*
3057 * frame is destined for this interface, but if it's
3058 * not also for the previous one we handle that after
3059 * the loop to avoid copying the SKB once too much
3060 */
3061
3062 if (!prev) {
3063 prev = sdata;
3064 continue;
3065 }
3066
3067 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3068 rx.sdata = prev;
3069 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3070
3071 prev = sdata;
3072 }
3073
3074 if (prev) {
3075 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3076 rx.sdata = prev;
3077
3078 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3079 return;
3080 }
3081
3082 out:
3083 dev_kfree_skb(skb);
3084}
3085
3086/*
3087 * This is the receive path handler. It is called by a low level driver when an
3088 * 802.11 MPDU is received from the hardware.
3089 */
3090void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3091{
3092 struct ieee80211_local *local = hw_to_local(hw);
3093 struct ieee80211_rate *rate = NULL;
3094 struct ieee80211_supported_band *sband;
3095 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3096
3097 WARN_ON_ONCE_NONRT(softirq_count() == 0);
3098
3099 if (WARN_ON(status->band < 0 ||
3100 status->band >= IEEE80211_NUM_BANDS))
3101 goto drop;
3102
3103 sband = local->hw.wiphy->bands[status->band];
3104 if (WARN_ON(!sband))
3105 goto drop;
3106
3107 /*
3108 * If we're suspending, it is possible although not too likely
3109 * that we'd be receiving frames after having already partially
3110 * quiesced the stack. We can't process such frames then since
3111 * that might, for example, cause stations to be added or other
3112 * driver callbacks be invoked.
3113 */
3114 if (unlikely(local->quiescing || local->suspended))
3115 goto drop;
3116
3117 /*
3118 * The same happens when we're not even started,
3119 * but that's worth a warning.
3120 */
3121 if (WARN_ON(!local->started))
3122 goto drop;
3123
3124 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3125 /*
3126 * Validate the rate, unless a PLCP error means that
3127 * we probably can't have a valid rate here anyway.
3128 */
3129
3130 if (status->flag & RX_FLAG_HT) {
3131 /*
3132 * rate_idx is MCS index, which can be [0-76]
3133 * as documented on:
3134 *
3135 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3136 *
3137 * Anything else would be some sort of driver or
3138 * hardware error. The driver should catch hardware
3139 * errors.
3140 */
3141 if (WARN((status->rate_idx < 0 ||
3142 status->rate_idx > 76),
3143 "Rate marked as an HT rate but passed "
3144 "status->rate_idx is not "
3145 "an MCS index [0-76]: %d (0x%02x)\n",
3146 status->rate_idx,
3147 status->rate_idx))
3148 goto drop;
3149 } else {
3150 if (WARN_ON(status->rate_idx < 0 ||
3151 status->rate_idx >= sband->n_bitrates))
3152 goto drop;
3153 rate = &sband->bitrates[status->rate_idx];
3154 }
3155 }
3156
3157 status->rx_flags = 0;
3158
3159 /*
3160 * key references and virtual interfaces are protected using RCU
3161 * and this requires that we are in a read-side RCU section during
3162 * receive processing
3163 */
3164 rcu_read_lock();
3165
3166 /*
3167 * Frames with failed FCS/PLCP checksum are not returned,
3168 * all other frames are returned without radiotap header
3169 * if it was previously present.
3170 * Also, frames with less than 16 bytes are dropped.
3171 */
3172 skb = ieee80211_rx_monitor(local, skb, rate);
3173 if (!skb) {
3174 rcu_read_unlock();
3175 return;
3176 }
3177
3178 ieee80211_tpt_led_trig_rx(local,
3179 ((struct ieee80211_hdr *)skb->data)->frame_control,
3180 skb->len);
3181 __ieee80211_rx_handle_packet(hw, skb);
3182
3183 rcu_read_unlock();
3184
3185 return;
3186 drop:
3187 kfree_skb(skb);
3188}
3189EXPORT_SYMBOL(ieee80211_rx);
3190
3191/* This is a version of the rx handler that can be called from hard irq
3192 * context. Post the skb on the queue and schedule the tasklet */
3193void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3194{
3195 struct ieee80211_local *local = hw_to_local(hw);
3196
3197 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3198
3199 skb->pkt_type = IEEE80211_RX_MSG;
3200 skb_queue_tail(&local->skb_queue, skb);
3201 tasklet_schedule(&local->tasklet);
3202}
3203EXPORT_SYMBOL(ieee80211_rx_irqsafe);