]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame_incremental - net/mac80211/rx.c
projects / mirror_ubuntu-zesty-kernel.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
UBUNTU: Ubuntu-4.10.0-37.41
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / rx.c
... / ...
CommitLineData
1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/jiffies.h>
15#include <linux/slab.h>
16#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/rcupdate.h>
21#include <linux/export.h>
22#include <linux/bitops.h>
23#include <net/mac80211.h>
24#include <net/ieee80211_radiotap.h>
25#include <asm/unaligned.h>
26
27#include "ieee80211_i.h"
28#include "driver-ops.h"
29#include "led.h"
30#include "mesh.h"
31#include "wep.h"
32#include "wpa.h"
33#include "tkip.h"
34#include "wme.h"
35#include "rate.h"
36
37static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
38{
39 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
40
41 u64_stats_update_begin(&tstats->syncp);
42 tstats->rx_packets++;
43 tstats->rx_bytes += len;
44 u64_stats_update_end(&tstats->syncp);
45}
46
47static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
49{
50 __le16 fc = hdr->frame_control;
51
52 if (ieee80211_is_data(fc)) {
53 if (len < 24) /* drop incorrect hdr len (data) */
54 return NULL;
55
56 if (ieee80211_has_a4(fc))
57 return NULL;
58 if (ieee80211_has_tods(fc))
59 return hdr->addr1;
60 if (ieee80211_has_fromds(fc))
61 return hdr->addr2;
62
63 return hdr->addr3;
64 }
65
66 if (ieee80211_is_mgmt(fc)) {
67 if (len < 24) /* drop incorrect hdr len (mgmt) */
68 return NULL;
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_ctl(fc)) {
73 if (ieee80211_is_pspoll(fc))
74 return hdr->addr1;
75
76 if (ieee80211_is_back_req(fc)) {
77 switch (type) {
78 case NL80211_IFTYPE_STATION:
79 return hdr->addr2;
80 case NL80211_IFTYPE_AP:
81 case NL80211_IFTYPE_AP_VLAN:
82 return hdr->addr1;
83 default:
84 break; /* fall through to the return */
85 }
86 }
87 }
88
89 return NULL;
90}
91
92/*
93 * monitor mode reception
94 *
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
97 */
98static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
99 struct sk_buff *skb,
100 unsigned int rtap_vendor_space)
101{
102 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
103 if (likely(skb->len > FCS_LEN))
104 __pskb_trim(skb, skb->len - FCS_LEN);
105 else {
106 /* driver bug */
107 WARN_ON(1);
108 dev_kfree_skb(skb);
109 return NULL;
110 }
111 }
112
113 __pskb_pull(skb, rtap_vendor_space);
114
115 return skb;
116}
117
118static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
119 unsigned int rtap_vendor_space)
120{
121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
122 struct ieee80211_hdr *hdr;
123
124 hdr = (void *)(skb->data + rtap_vendor_space);
125
126 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
127 RX_FLAG_FAILED_PLCP_CRC |
128 RX_FLAG_ONLY_MONITOR))
129 return true;
130
131 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
132 return true;
133
134 if (ieee80211_is_ctl(hdr->frame_control) &&
135 !ieee80211_is_pspoll(hdr->frame_control) &&
136 !ieee80211_is_back_req(hdr->frame_control))
137 return true;
138
139 return false;
140}
141
142static int
143ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
144 struct ieee80211_rx_status *status,
145 struct sk_buff *skb)
146{
147 int len;
148
149 /* always present fields */
150 len = sizeof(struct ieee80211_radiotap_header) + 8;
151
152 /* allocate extra bitmaps */
153 if (status->chains)
154 len += 4 * hweight8(status->chains);
155
156 if (ieee80211_have_rx_timestamp(status)) {
157 len = ALIGN(len, 8);
158 len += 8;
159 }
160 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
161 len += 1;
162
163 /* antenna field, if we don't have per-chain info */
164 if (!status->chains)
165 len += 1;
166
167 /* padding for RX_FLAGS if necessary */
168 len = ALIGN(len, 2);
169
170 if (status->flag & RX_FLAG_HT) /* HT info */
171 len += 3;
172
173 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
174 len = ALIGN(len, 4);
175 len += 8;
176 }
177
178 if (status->flag & RX_FLAG_VHT) {
179 len = ALIGN(len, 2);
180 len += 12;
181 }
182
183 if (local->hw.radiotap_timestamp.units_pos >= 0) {
184 len = ALIGN(len, 8);
185 len += 12;
186 }
187
188 if (status->chains) {
189 /* antenna and antenna signal fields */
190 len += 2 * hweight8(status->chains);
191 }
192
193 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
194 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
195
196 /* vendor presence bitmap */
197 len += 4;
198 /* alignment for fixed 6-byte vendor data header */
199 len = ALIGN(len, 2);
200 /* vendor data header */
201 len += 6;
202 if (WARN_ON(rtap->align == 0))
203 rtap->align = 1;
204 len = ALIGN(len, rtap->align);
205 len += rtap->len + rtap->pad;
206 }
207
208 return len;
209}
210
211static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
212 struct sk_buff *skb,
213 int rtap_vendor_space)
214{
215 struct {
216 struct ieee80211_hdr_3addr hdr;
217 u8 category;
218 u8 action_code;
219 } __packed action;
220
221 if (!sdata)
222 return;
223
224 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
225
226 if (skb->len < rtap_vendor_space + sizeof(action) +
227 VHT_MUMIMO_GROUPS_DATA_LEN)
228 return;
229
230 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
231 return;
232
233 skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
234
235 if (!ieee80211_is_action(action.hdr.frame_control))
236 return;
237
238 if (action.category != WLAN_CATEGORY_VHT)
239 return;
240
241 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
242 return;
243
244 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
245 return;
246
247 skb = skb_copy(skb, GFP_ATOMIC);
248 if (!skb)
249 return;
250
251 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
252 skb_queue_tail(&sdata->skb_queue, skb);
253 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
254}
255
256/*
257 * ieee80211_add_rx_radiotap_header - add radiotap header
258 *
259 * add a radiotap header containing all the fields which the hardware provided.
260 */
261static void
262ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
263 struct sk_buff *skb,
264 struct ieee80211_rate *rate,
265 int rtap_len, bool has_fcs)
266{
267 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
268 struct ieee80211_radiotap_header *rthdr;
269 unsigned char *pos;
270 __le32 *it_present;
271 u32 it_present_val;
272 u16 rx_flags = 0;
273 u16 channel_flags = 0;
274 int mpdulen, chain;
275 unsigned long chains = status->chains;
276 struct ieee80211_vendor_radiotap rtap = {};
277
278 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
279 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
280 /* rtap.len and rtap.pad are undone immediately */
281 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
282 }
283
284 mpdulen = skb->len;
285 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
286 mpdulen += FCS_LEN;
287
288 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
289 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
290 it_present = &rthdr->it_present;
291
292 /* radiotap header, set always present flags */
293 rthdr->it_len = cpu_to_le16(rtap_len);
294 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
295 BIT(IEEE80211_RADIOTAP_CHANNEL) |
296 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
297
298 if (!status->chains)
299 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
300
301 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
302 it_present_val |=
303 BIT(IEEE80211_RADIOTAP_EXT) |
304 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
305 put_unaligned_le32(it_present_val, it_present);
306 it_present++;
307 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
308 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
309 }
310
311 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
312 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
313 BIT(IEEE80211_RADIOTAP_EXT);
314 put_unaligned_le32(it_present_val, it_present);
315 it_present++;
316 it_present_val = rtap.present;
317 }
318
319 put_unaligned_le32(it_present_val, it_present);
320
321 pos = (void *)(it_present + 1);
322
323 /* the order of the following fields is important */
324
325 /* IEEE80211_RADIOTAP_TSFT */
326 if (ieee80211_have_rx_timestamp(status)) {
327 /* padding */
328 while ((pos - (u8 *)rthdr) & 7)
329 *pos++ = 0;
330 put_unaligned_le64(
331 ieee80211_calculate_rx_timestamp(local, status,
332 mpdulen, 0),
333 pos);
334 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
335 pos += 8;
336 }
337
338 /* IEEE80211_RADIOTAP_FLAGS */
339 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
340 *pos |= IEEE80211_RADIOTAP_F_FCS;
341 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
342 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
343 if (status->flag & RX_FLAG_SHORTPRE)
344 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
345 pos++;
346
347 /* IEEE80211_RADIOTAP_RATE */
348 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
349 /*
350 * Without rate information don't add it. If we have,
351 * MCS information is a separate field in radiotap,
352 * added below. The byte here is needed as padding
353 * for the channel though, so initialise it to 0.
354 */
355 *pos = 0;
356 } else {
357 int shift = 0;
358 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
359 if (status->flag & RX_FLAG_10MHZ)
360 shift = 1;
361 else if (status->flag & RX_FLAG_5MHZ)
362 shift = 2;
363 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
364 }
365 pos++;
366
367 /* IEEE80211_RADIOTAP_CHANNEL */
368 put_unaligned_le16(status->freq, pos);
369 pos += 2;
370 if (status->flag & RX_FLAG_10MHZ)
371 channel_flags |= IEEE80211_CHAN_HALF;
372 else if (status->flag & RX_FLAG_5MHZ)
373 channel_flags |= IEEE80211_CHAN_QUARTER;
374
375 if (status->band == NL80211_BAND_5GHZ)
376 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
377 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
378 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
379 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
380 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
381 else if (rate)
382 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
383 else
384 channel_flags |= IEEE80211_CHAN_2GHZ;
385 put_unaligned_le16(channel_flags, pos);
386 pos += 2;
387
388 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
389 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
390 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
391 *pos = status->signal;
392 rthdr->it_present |=
393 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
394 pos++;
395 }
396
397 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
398
399 if (!status->chains) {
400 /* IEEE80211_RADIOTAP_ANTENNA */
401 *pos = status->antenna;
402 pos++;
403 }
404
405 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
406
407 /* IEEE80211_RADIOTAP_RX_FLAGS */
408 /* ensure 2 byte alignment for the 2 byte field as required */
409 if ((pos - (u8 *)rthdr) & 1)
410 *pos++ = 0;
411 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
412 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
413 put_unaligned_le16(rx_flags, pos);
414 pos += 2;
415
416 if (status->flag & RX_FLAG_HT) {
417 unsigned int stbc;
418
419 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
420 *pos++ = local->hw.radiotap_mcs_details;
421 *pos = 0;
422 if (status->flag & RX_FLAG_SHORT_GI)
423 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
424 if (status->flag & RX_FLAG_40MHZ)
425 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
426 if (status->flag & RX_FLAG_HT_GF)
427 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
428 if (status->flag & RX_FLAG_LDPC)
429 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
430 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
431 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
432 pos++;
433 *pos++ = status->rate_idx;
434 }
435
436 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
437 u16 flags = 0;
438
439 /* ensure 4 byte alignment */
440 while ((pos - (u8 *)rthdr) & 3)
441 pos++;
442 rthdr->it_present |=
443 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
444 put_unaligned_le32(status->ampdu_reference, pos);
445 pos += 4;
446 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
447 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
448 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
449 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
450 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
451 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
452 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
453 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
454 put_unaligned_le16(flags, pos);
455 pos += 2;
456 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
457 *pos++ = status->ampdu_delimiter_crc;
458 else
459 *pos++ = 0;
460 *pos++ = 0;
461 }
462
463 if (status->flag & RX_FLAG_VHT) {
464 u16 known = local->hw.radiotap_vht_details;
465
466 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
467 put_unaligned_le16(known, pos);
468 pos += 2;
469 /* flags */
470 if (status->flag & RX_FLAG_SHORT_GI)
471 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
472 /* in VHT, STBC is binary */
473 if (status->flag & RX_FLAG_STBC_MASK)
474 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
475 if (status->vht_flag & RX_VHT_FLAG_BF)
476 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
477 pos++;
478 /* bandwidth */
479 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
480 *pos++ = 4;
481 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
482 *pos++ = 11;
483 else if (status->flag & RX_FLAG_40MHZ)
484 *pos++ = 1;
485 else /* 20 MHz */
486 *pos++ = 0;
487 /* MCS/NSS */
488 *pos = (status->rate_idx << 4) | status->vht_nss;
489 pos += 4;
490 /* coding field */
491 if (status->flag & RX_FLAG_LDPC)
492 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
493 pos++;
494 /* group ID */
495 pos++;
496 /* partial_aid */
497 pos += 2;
498 }
499
500 if (local->hw.radiotap_timestamp.units_pos >= 0) {
501 u16 accuracy = 0;
502 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
503
504 rthdr->it_present |=
505 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
506
507 /* ensure 8 byte alignment */
508 while ((pos - (u8 *)rthdr) & 7)
509 pos++;
510
511 put_unaligned_le64(status->device_timestamp, pos);
512 pos += sizeof(u64);
513
514 if (local->hw.radiotap_timestamp.accuracy >= 0) {
515 accuracy = local->hw.radiotap_timestamp.accuracy;
516 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
517 }
518 put_unaligned_le16(accuracy, pos);
519 pos += sizeof(u16);
520
521 *pos++ = local->hw.radiotap_timestamp.units_pos;
522 *pos++ = flags;
523 }
524
525 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
526 *pos++ = status->chain_signal[chain];
527 *pos++ = chain;
528 }
529
530 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
531 /* ensure 2 byte alignment for the vendor field as required */
532 if ((pos - (u8 *)rthdr) & 1)
533 *pos++ = 0;
534 *pos++ = rtap.oui[0];
535 *pos++ = rtap.oui[1];
536 *pos++ = rtap.oui[2];
537 *pos++ = rtap.subns;
538 put_unaligned_le16(rtap.len, pos);
539 pos += 2;
540 /* align the actual payload as requested */
541 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
542 *pos++ = 0;
543 /* data (and possible padding) already follows */
544 }
545}
546
547/*
548 * This function copies a received frame to all monitor interfaces and
549 * returns a cleaned-up SKB that no longer includes the FCS nor the
550 * radiotap header the driver might have added.
551 */
552static struct sk_buff *
553ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
554 struct ieee80211_rate *rate)
555{
556 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
557 struct ieee80211_sub_if_data *sdata;
558 int rt_hdrlen, needed_headroom;
559 struct sk_buff *skb, *skb2;
560 struct net_device *prev_dev = NULL;
561 int present_fcs_len = 0;
562 unsigned int rtap_vendor_space = 0;
563 struct ieee80211_sub_if_data *monitor_sdata =
564 rcu_dereference(local->monitor_sdata);
565
566 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
567 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
568
569 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
570 }
571
572 /*
573 * First, we may need to make a copy of the skb because
574 * (1) we need to modify it for radiotap (if not present), and
575 * (2) the other RX handlers will modify the skb we got.
576 *
577 * We don't need to, of course, if we aren't going to return
578 * the SKB because it has a bad FCS/PLCP checksum.
579 */
580
581 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
582 present_fcs_len = FCS_LEN;
583
584 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
585 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
586 dev_kfree_skb(origskb);
587 return NULL;
588 }
589
590 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
591 if (should_drop_frame(origskb, present_fcs_len,
592 rtap_vendor_space)) {
593 dev_kfree_skb(origskb);
594 return NULL;
595 }
596
597 return remove_monitor_info(local, origskb, rtap_vendor_space);
598 }
599
600 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
601
602 /* room for the radiotap header based on driver features */
603 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
604 needed_headroom = rt_hdrlen - rtap_vendor_space;
605
606 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
607 /* only need to expand headroom if necessary */
608 skb = origskb;
609 origskb = NULL;
610
611 /*
612 * This shouldn't trigger often because most devices have an
613 * RX header they pull before we get here, and that should
614 * be big enough for our radiotap information. We should
615 * probably export the length to drivers so that we can have
616 * them allocate enough headroom to start with.
617 */
618 if (skb_headroom(skb) < needed_headroom &&
619 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
620 dev_kfree_skb(skb);
621 return NULL;
622 }
623 } else {
624 /*
625 * Need to make a copy and possibly remove radiotap header
626 * and FCS from the original.
627 */
628 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
629
630 origskb = remove_monitor_info(local, origskb,
631 rtap_vendor_space);
632
633 if (!skb)
634 return origskb;
635 }
636
637 /* prepend radiotap information */
638 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
639
640 skb_reset_mac_header(skb);
641 skb->ip_summed = CHECKSUM_UNNECESSARY;
642 skb->pkt_type = PACKET_OTHERHOST;
643 skb->protocol = htons(ETH_P_802_2);
644
645 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
646 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
647 continue;
648
649 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
650 continue;
651
652 if (!ieee80211_sdata_running(sdata))
653 continue;
654
655 if (prev_dev) {
656 skb2 = skb_clone(skb, GFP_ATOMIC);
657 if (skb2) {
658 skb2->dev = prev_dev;
659 netif_receive_skb(skb2);
660 }
661 }
662
663 prev_dev = sdata->dev;
664 ieee80211_rx_stats(sdata->dev, skb->len);
665 }
666
667 if (prev_dev) {
668 skb->dev = prev_dev;
669 netif_receive_skb(skb);
670 } else
671 dev_kfree_skb(skb);
672
673 return origskb;
674}
675
676static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
677{
678 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
679 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
680 int tid, seqno_idx, security_idx;
681
682 /* does the frame have a qos control field? */
683 if (ieee80211_is_data_qos(hdr->frame_control)) {
684 u8 *qc = ieee80211_get_qos_ctl(hdr);
685 /* frame has qos control */
686 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
687 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
688 status->rx_flags |= IEEE80211_RX_AMSDU;
689
690 seqno_idx = tid;
691 security_idx = tid;
692 } else {
693 /*
694 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
695 *
696 * Sequence numbers for management frames, QoS data
697 * frames with a broadcast/multicast address in the
698 * Address 1 field, and all non-QoS data frames sent
699 * by QoS STAs are assigned using an additional single
700 * modulo-4096 counter, [...]
701 *
702 * We also use that counter for non-QoS STAs.
703 */
704 seqno_idx = IEEE80211_NUM_TIDS;
705 security_idx = 0;
706 if (ieee80211_is_mgmt(hdr->frame_control))
707 security_idx = IEEE80211_NUM_TIDS;
708 tid = 0;
709 }
710
711 rx->seqno_idx = seqno_idx;
712 rx->security_idx = security_idx;
713 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
714 * For now, set skb->priority to 0 for other cases. */
715 rx->skb->priority = (tid > 7) ? 0 : tid;
716}
717
718/**
719 * DOC: Packet alignment
720 *
721 * Drivers always need to pass packets that are aligned to two-byte boundaries
722 * to the stack.
723 *
724 * Additionally, should, if possible, align the payload data in a way that
725 * guarantees that the contained IP header is aligned to a four-byte
726 * boundary. In the case of regular frames, this simply means aligning the
727 * payload to a four-byte boundary (because either the IP header is directly
728 * contained, or IV/RFC1042 headers that have a length divisible by four are
729 * in front of it). If the payload data is not properly aligned and the
730 * architecture doesn't support efficient unaligned operations, mac80211
731 * will align the data.
732 *
733 * With A-MSDU frames, however, the payload data address must yield two modulo
734 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
735 * push the IP header further back to a multiple of four again. Thankfully, the
736 * specs were sane enough this time around to require padding each A-MSDU
737 * subframe to a length that is a multiple of four.
738 *
739 * Padding like Atheros hardware adds which is between the 802.11 header and
740 * the payload is not supported, the driver is required to move the 802.11
741 * header to be directly in front of the payload in that case.
742 */
743static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
744{
745#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
746 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
747#endif
748}
749
750
751/* rx handlers */
752
753static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
754{
755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
756
757 if (is_multicast_ether_addr(hdr->addr1))
758 return 0;
759
760 return ieee80211_is_robust_mgmt_frame(skb);
761}
762
763
764static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
765{
766 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
767
768 if (!is_multicast_ether_addr(hdr->addr1))
769 return 0;
770
771 return ieee80211_is_robust_mgmt_frame(skb);
772}
773
774
775/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
776static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
777{
778 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
779 struct ieee80211_mmie *mmie;
780 struct ieee80211_mmie_16 *mmie16;
781
782 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
783 return -1;
784
785 if (!ieee80211_is_robust_mgmt_frame(skb))
786 return -1; /* not a robust management frame */
787
788 mmie = (struct ieee80211_mmie *)
789 (skb->data + skb->len - sizeof(*mmie));
790 if (mmie->element_id == WLAN_EID_MMIE &&
791 mmie->length == sizeof(*mmie) - 2)
792 return le16_to_cpu(mmie->key_id);
793
794 mmie16 = (struct ieee80211_mmie_16 *)
795 (skb->data + skb->len - sizeof(*mmie16));
796 if (skb->len >= 24 + sizeof(*mmie16) &&
797 mmie16->element_id == WLAN_EID_MMIE &&
798 mmie16->length == sizeof(*mmie16) - 2)
799 return le16_to_cpu(mmie16->key_id);
800
801 return -1;
802}
803
804static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
805 struct sk_buff *skb)
806{
807 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
808 __le16 fc;
809 int hdrlen;
810 u8 keyid;
811
812 fc = hdr->frame_control;
813 hdrlen = ieee80211_hdrlen(fc);
814
815 if (skb->len < hdrlen + cs->hdr_len)
816 return -EINVAL;
817
818 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
819 keyid &= cs->key_idx_mask;
820 keyid >>= cs->key_idx_shift;
821
822 return keyid;
823}
824
825static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
826{
827 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
828 char *dev_addr = rx->sdata->vif.addr;
829
830 if (ieee80211_is_data(hdr->frame_control)) {
831 if (is_multicast_ether_addr(hdr->addr1)) {
832 if (ieee80211_has_tods(hdr->frame_control) ||
833 !ieee80211_has_fromds(hdr->frame_control))
834 return RX_DROP_MONITOR;
835 if (ether_addr_equal(hdr->addr3, dev_addr))
836 return RX_DROP_MONITOR;
837 } else {
838 if (!ieee80211_has_a4(hdr->frame_control))
839 return RX_DROP_MONITOR;
840 if (ether_addr_equal(hdr->addr4, dev_addr))
841 return RX_DROP_MONITOR;
842 }
843 }
844
845 /* If there is not an established peer link and this is not a peer link
846 * establisment frame, beacon or probe, drop the frame.
847 */
848
849 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
850 struct ieee80211_mgmt *mgmt;
851
852 if (!ieee80211_is_mgmt(hdr->frame_control))
853 return RX_DROP_MONITOR;
854
855 if (ieee80211_is_action(hdr->frame_control)) {
856 u8 category;
857
858 /* make sure category field is present */
859 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
860 return RX_DROP_MONITOR;
861
862 mgmt = (struct ieee80211_mgmt *)hdr;
863 category = mgmt->u.action.category;
864 if (category != WLAN_CATEGORY_MESH_ACTION &&
865 category != WLAN_CATEGORY_SELF_PROTECTED)
866 return RX_DROP_MONITOR;
867 return RX_CONTINUE;
868 }
869
870 if (ieee80211_is_probe_req(hdr->frame_control) ||
871 ieee80211_is_probe_resp(hdr->frame_control) ||
872 ieee80211_is_beacon(hdr->frame_control) ||
873 ieee80211_is_auth(hdr->frame_control))
874 return RX_CONTINUE;
875
876 return RX_DROP_MONITOR;
877 }
878
879 return RX_CONTINUE;
880}
881
882static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
883 int index)
884{
885 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
886 struct sk_buff *tail = skb_peek_tail(frames);
887 struct ieee80211_rx_status *status;
888
889 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
890 return true;
891
892 if (!tail)
893 return false;
894
895 status = IEEE80211_SKB_RXCB(tail);
896 if (status->flag & RX_FLAG_AMSDU_MORE)
897 return false;
898
899 return true;
900}
901
902static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
903 struct tid_ampdu_rx *tid_agg_rx,
904 int index,
905 struct sk_buff_head *frames)
906{
907 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
908 struct sk_buff *skb;
909 struct ieee80211_rx_status *status;
910
911 lockdep_assert_held(&tid_agg_rx->reorder_lock);
912
913 if (skb_queue_empty(skb_list))
914 goto no_frame;
915
916 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
917 __skb_queue_purge(skb_list);
918 goto no_frame;
919 }
920
921 /* release frames from the reorder ring buffer */
922 tid_agg_rx->stored_mpdu_num--;
923 while ((skb = __skb_dequeue(skb_list))) {
924 status = IEEE80211_SKB_RXCB(skb);
925 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
926 __skb_queue_tail(frames, skb);
927 }
928
929no_frame:
930 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
931 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
932}
933
934static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
935 struct tid_ampdu_rx *tid_agg_rx,
936 u16 head_seq_num,
937 struct sk_buff_head *frames)
938{
939 int index;
940
941 lockdep_assert_held(&tid_agg_rx->reorder_lock);
942
943 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
944 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
945 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
946 frames);
947 }
948}
949
950/*
951 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
952 * the skb was added to the buffer longer than this time ago, the earlier
953 * frames that have not yet been received are assumed to be lost and the skb
954 * can be released for processing. This may also release other skb's from the
955 * reorder buffer if there are no additional gaps between the frames.
956 *
957 * Callers must hold tid_agg_rx->reorder_lock.
958 */
959#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
960
961static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
962 struct tid_ampdu_rx *tid_agg_rx,
963 struct sk_buff_head *frames)
964{
965 int index, i, j;
966
967 lockdep_assert_held(&tid_agg_rx->reorder_lock);
968
969 /* release the buffer until next missing frame */
970 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
971 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
972 tid_agg_rx->stored_mpdu_num) {
973 /*
974 * No buffers ready to be released, but check whether any
975 * frames in the reorder buffer have timed out.
976 */
977 int skipped = 1;
978 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
979 j = (j + 1) % tid_agg_rx->buf_size) {
980 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
981 skipped++;
982 continue;
983 }
984 if (skipped &&
985 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
986 HT_RX_REORDER_BUF_TIMEOUT))
987 goto set_release_timer;
988
989 /* don't leave incomplete A-MSDUs around */
990 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
991 i = (i + 1) % tid_agg_rx->buf_size)
992 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
993
994 ht_dbg_ratelimited(sdata,
995 "release an RX reorder frame due to timeout on earlier frames\n");
996 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
997 frames);
998
999 /*
1000 * Increment the head seq# also for the skipped slots.
1001 */
1002 tid_agg_rx->head_seq_num =
1003 (tid_agg_rx->head_seq_num +
1004 skipped) & IEEE80211_SN_MASK;
1005 skipped = 0;
1006 }
1007 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1008 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1009 frames);
1010 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1011 }
1012
1013 if (tid_agg_rx->stored_mpdu_num) {
1014 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
1015
1016 for (; j != (index - 1) % tid_agg_rx->buf_size;
1017 j = (j + 1) % tid_agg_rx->buf_size) {
1018 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
1019 break;
1020 }
1021
1022 set_release_timer:
1023
1024 if (!tid_agg_rx->removed)
1025 mod_timer(&tid_agg_rx->reorder_timer,
1026 tid_agg_rx->reorder_time[j] + 1 +
1027 HT_RX_REORDER_BUF_TIMEOUT);
1028 } else {
1029 del_timer(&tid_agg_rx->reorder_timer);
1030 }
1031}
1032
1033/*
1034 * As this function belongs to the RX path it must be under
1035 * rcu_read_lock protection. It returns false if the frame
1036 * can be processed immediately, true if it was consumed.
1037 */
1038static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1039 struct tid_ampdu_rx *tid_agg_rx,
1040 struct sk_buff *skb,
1041 struct sk_buff_head *frames)
1042{
1043 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1044 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1045 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1046 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1047 u16 head_seq_num, buf_size;
1048 int index;
1049 bool ret = true;
1050
1051 spin_lock(&tid_agg_rx->reorder_lock);
1052
1053 /*
1054 * Offloaded BA sessions have no known starting sequence number so pick
1055 * one from first Rxed frame for this tid after BA was started.
1056 */
1057 if (unlikely(tid_agg_rx->auto_seq)) {
1058 tid_agg_rx->auto_seq = false;
1059 tid_agg_rx->ssn = mpdu_seq_num;
1060 tid_agg_rx->head_seq_num = mpdu_seq_num;
1061 }
1062
1063 buf_size = tid_agg_rx->buf_size;
1064 head_seq_num = tid_agg_rx->head_seq_num;
1065
1066 /*
1067 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1068 * be reordered.
1069 */
1070 if (unlikely(!tid_agg_rx->started)) {
1071 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1072 ret = false;
1073 goto out;
1074 }
1075 tid_agg_rx->started = true;
1076 }
1077
1078 /* frame with out of date sequence number */
1079 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1080 dev_kfree_skb(skb);
1081 goto out;
1082 }
1083
1084 /*
1085 * If frame the sequence number exceeds our buffering window
1086 * size release some previous frames to make room for this one.
1087 */
1088 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1089 head_seq_num = ieee80211_sn_inc(
1090 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1091 /* release stored frames up to new head to stack */
1092 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1093 head_seq_num, frames);
1094 }
1095
1096 /* Now the new frame is always in the range of the reordering buffer */
1097
1098 index = mpdu_seq_num % tid_agg_rx->buf_size;
1099
1100 /* check if we already stored this frame */
1101 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1102 dev_kfree_skb(skb);
1103 goto out;
1104 }
1105
1106 /*
1107 * If the current MPDU is in the right order and nothing else
1108 * is stored we can process it directly, no need to buffer it.
1109 * If it is first but there's something stored, we may be able
1110 * to release frames after this one.
1111 */
1112 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1113 tid_agg_rx->stored_mpdu_num == 0) {
1114 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1115 tid_agg_rx->head_seq_num =
1116 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1117 ret = false;
1118 goto out;
1119 }
1120
1121 /* put the frame in the reordering buffer */
1122 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1123 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1124 tid_agg_rx->reorder_time[index] = jiffies;
1125 tid_agg_rx->stored_mpdu_num++;
1126 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1127 }
1128
1129 out:
1130 spin_unlock(&tid_agg_rx->reorder_lock);
1131 return ret;
1132}
1133
1134/*
1135 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1136 * true if the MPDU was buffered, false if it should be processed.
1137 */
1138static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1139 struct sk_buff_head *frames)
1140{
1141 struct sk_buff *skb = rx->skb;
1142 struct ieee80211_local *local = rx->local;
1143 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1144 struct sta_info *sta = rx->sta;
1145 struct tid_ampdu_rx *tid_agg_rx;
1146 u16 sc;
1147 u8 tid, ack_policy;
1148
1149 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1150 is_multicast_ether_addr(hdr->addr1))
1151 goto dont_reorder;
1152
1153 /*
1154 * filter the QoS data rx stream according to
1155 * STA/TID and check if this STA/TID is on aggregation
1156 */
1157
1158 if (!sta)
1159 goto dont_reorder;
1160
1161 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1162 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1163 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1164
1165 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1166 if (!tid_agg_rx) {
1167 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1168 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1169 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1170 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1171 WLAN_BACK_RECIPIENT,
1172 WLAN_REASON_QSTA_REQUIRE_SETUP);
1173 goto dont_reorder;
1174 }
1175
1176 /* qos null data frames are excluded */
1177 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1178 goto dont_reorder;
1179
1180 /* not part of a BA session */
1181 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1182 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1183 goto dont_reorder;
1184
1185 /* new, potentially un-ordered, ampdu frame - process it */
1186
1187 /* reset session timer */
1188 if (tid_agg_rx->timeout)
1189 tid_agg_rx->last_rx = jiffies;
1190
1191 /* if this mpdu is fragmented - terminate rx aggregation session */
1192 sc = le16_to_cpu(hdr->seq_ctrl);
1193 if (sc & IEEE80211_SCTL_FRAG) {
1194 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1195 skb_queue_tail(&rx->sdata->skb_queue, skb);
1196 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1197 return;
1198 }
1199
1200 /*
1201 * No locking needed -- we will only ever process one
1202 * RX packet at a time, and thus own tid_agg_rx. All
1203 * other code manipulating it needs to (and does) make
1204 * sure that we cannot get to it any more before doing
1205 * anything with it.
1206 */
1207 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1208 frames))
1209 return;
1210
1211 dont_reorder:
1212 __skb_queue_tail(frames, skb);
1213}
1214
1215static ieee80211_rx_result debug_noinline
1216ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1217{
1218 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1219 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1220
1221 if (status->flag & RX_FLAG_DUP_VALIDATED)
1222 return RX_CONTINUE;
1223
1224 /*
1225 * Drop duplicate 802.11 retransmissions
1226 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1227 */
1228
1229 if (rx->skb->len < 24)
1230 return RX_CONTINUE;
1231
1232 if (ieee80211_is_ctl(hdr->frame_control) ||
1233 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1234 is_multicast_ether_addr(hdr->addr1))
1235 return RX_CONTINUE;
1236
1237 if (!rx->sta)
1238 return RX_CONTINUE;
1239
1240 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1241 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1242 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1243 rx->sta->rx_stats.num_duplicates++;
1244 return RX_DROP_UNUSABLE;
1245 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1246 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1247 }
1248
1249 return RX_CONTINUE;
1250}
1251
1252static ieee80211_rx_result debug_noinline
1253ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1254{
1255 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1256
1257 /* Drop disallowed frame classes based on STA auth/assoc state;
1258 * IEEE 802.11, Chap 5.5.
1259 *
1260 * mac80211 filters only based on association state, i.e. it drops
1261 * Class 3 frames from not associated stations. hostapd sends
1262 * deauth/disassoc frames when needed. In addition, hostapd is
1263 * responsible for filtering on both auth and assoc states.
1264 */
1265
1266 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1267 return ieee80211_rx_mesh_check(rx);
1268
1269 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1270 ieee80211_is_pspoll(hdr->frame_control)) &&
1271 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1272 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1273 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1274 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1275 /*
1276 * accept port control frames from the AP even when it's not
1277 * yet marked ASSOC to prevent a race where we don't set the
1278 * assoc bit quickly enough before it sends the first frame
1279 */
1280 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1281 ieee80211_is_data_present(hdr->frame_control)) {
1282 unsigned int hdrlen;
1283 __be16 ethertype;
1284
1285 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1286
1287 if (rx->skb->len < hdrlen + 8)
1288 return RX_DROP_MONITOR;
1289
1290 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1291 if (ethertype == rx->sdata->control_port_protocol)
1292 return RX_CONTINUE;
1293 }
1294
1295 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1296 cfg80211_rx_spurious_frame(rx->sdata->dev,
1297 hdr->addr2,
1298 GFP_ATOMIC))
1299 return RX_DROP_UNUSABLE;
1300
1301 return RX_DROP_MONITOR;
1302 }
1303
1304 return RX_CONTINUE;
1305}
1306
1307
1308static ieee80211_rx_result debug_noinline
1309ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1310{
1311 struct ieee80211_local *local;
1312 struct ieee80211_hdr *hdr;
1313 struct sk_buff *skb;
1314
1315 local = rx->local;
1316 skb = rx->skb;
1317 hdr = (struct ieee80211_hdr *) skb->data;
1318
1319 if (!local->pspolling)
1320 return RX_CONTINUE;
1321
1322 if (!ieee80211_has_fromds(hdr->frame_control))
1323 /* this is not from AP */
1324 return RX_CONTINUE;
1325
1326 if (!ieee80211_is_data(hdr->frame_control))
1327 return RX_CONTINUE;
1328
1329 if (!ieee80211_has_moredata(hdr->frame_control)) {
1330 /* AP has no more frames buffered for us */
1331 local->pspolling = false;
1332 return RX_CONTINUE;
1333 }
1334
1335 /* more data bit is set, let's request a new frame from the AP */
1336 ieee80211_send_pspoll(local, rx->sdata);
1337
1338 return RX_CONTINUE;
1339}
1340
1341static void sta_ps_start(struct sta_info *sta)
1342{
1343 struct ieee80211_sub_if_data *sdata = sta->sdata;
1344 struct ieee80211_local *local = sdata->local;
1345 struct ps_data *ps;
1346 int tid;
1347
1348 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1349 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1350 ps = &sdata->bss->ps;
1351 else
1352 return;
1353
1354 atomic_inc(&ps->num_sta_ps);
1355 set_sta_flag(sta, WLAN_STA_PS_STA);
1356 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1357 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1358 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1359 sta->sta.addr, sta->sta.aid);
1360
1361 ieee80211_clear_fast_xmit(sta);
1362
1363 if (!sta->sta.txq[0])
1364 return;
1365
1366 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1367 if (txq_has_queue(sta->sta.txq[tid]))
1368 set_bit(tid, &sta->txq_buffered_tids);
1369 else
1370 clear_bit(tid, &sta->txq_buffered_tids);
1371 }
1372}
1373
1374static void sta_ps_end(struct sta_info *sta)
1375{
1376 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1377 sta->sta.addr, sta->sta.aid);
1378
1379 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1380 /*
1381 * Clear the flag only if the other one is still set
1382 * so that the TX path won't start TX'ing new frames
1383 * directly ... In the case that the driver flag isn't
1384 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1385 */
1386 clear_sta_flag(sta, WLAN_STA_PS_STA);
1387 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1388 sta->sta.addr, sta->sta.aid);
1389 return;
1390 }
1391
1392 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1393 clear_sta_flag(sta, WLAN_STA_PS_STA);
1394 ieee80211_sta_ps_deliver_wakeup(sta);
1395}
1396
1397int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1398{
1399 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1400 bool in_ps;
1401
1402 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1403
1404 /* Don't let the same PS state be set twice */
1405 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1406 if ((start && in_ps) || (!start && !in_ps))
1407 return -EINVAL;
1408
1409 if (start)
1410 sta_ps_start(sta);
1411 else
1412 sta_ps_end(sta);
1413
1414 return 0;
1415}
1416EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1417
1418void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1419{
1420 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1421
1422 if (test_sta_flag(sta, WLAN_STA_SP))
1423 return;
1424
1425 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1426 ieee80211_sta_ps_deliver_poll_response(sta);
1427 else
1428 set_sta_flag(sta, WLAN_STA_PSPOLL);
1429}
1430EXPORT_SYMBOL(ieee80211_sta_pspoll);
1431
1432void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1433{
1434 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1435 u8 ac = ieee802_1d_to_ac[tid & 7];
1436
1437 /*
1438 * If this AC is not trigger-enabled do nothing unless the
1439 * driver is calling us after it already checked.
1440 *
1441 * NB: This could/should check a separate bitmap of trigger-
1442 * enabled queues, but for now we only implement uAPSD w/o
1443 * TSPEC changes to the ACs, so they're always the same.
1444 */
1445 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1446 tid != IEEE80211_NUM_TIDS)
1447 return;
1448
1449 /* if we are in a service period, do nothing */
1450 if (test_sta_flag(sta, WLAN_STA_SP))
1451 return;
1452
1453 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1454 ieee80211_sta_ps_deliver_uapsd(sta);
1455 else
1456 set_sta_flag(sta, WLAN_STA_UAPSD);
1457}
1458EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1459
1460static ieee80211_rx_result debug_noinline
1461ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1462{
1463 struct ieee80211_sub_if_data *sdata = rx->sdata;
1464 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1465 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1466
1467 if (!rx->sta)
1468 return RX_CONTINUE;
1469
1470 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1471 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1472 return RX_CONTINUE;
1473
1474 /*
1475 * The device handles station powersave, so don't do anything about
1476 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1477 * it to mac80211 since they're handled.)
1478 */
1479 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1480 return RX_CONTINUE;
1481
1482 /*
1483 * Don't do anything if the station isn't already asleep. In
1484 * the uAPSD case, the station will probably be marked asleep,
1485 * in the PS-Poll case the station must be confused ...
1486 */
1487 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1488 return RX_CONTINUE;
1489
1490 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1491 ieee80211_sta_pspoll(&rx->sta->sta);
1492
1493 /* Free PS Poll skb here instead of returning RX_DROP that would
1494 * count as an dropped frame. */
1495 dev_kfree_skb(rx->skb);
1496
1497 return RX_QUEUED;
1498 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1499 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1500 ieee80211_has_pm(hdr->frame_control) &&
1501 (ieee80211_is_data_qos(hdr->frame_control) ||
1502 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1503 u8 tid;
1504
1505 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1506
1507 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
1508 }
1509
1510 return RX_CONTINUE;
1511}
1512
1513static ieee80211_rx_result debug_noinline
1514ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1515{
1516 struct sta_info *sta = rx->sta;
1517 struct sk_buff *skb = rx->skb;
1518 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1519 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1520 int i;
1521
1522 if (!sta)
1523 return RX_CONTINUE;
1524
1525 /*
1526 * Update last_rx only for IBSS packets which are for the current
1527 * BSSID and for station already AUTHORIZED to avoid keeping the
1528 * current IBSS network alive in cases where other STAs start
1529 * using different BSSID. This will also give the station another
1530 * chance to restart the authentication/authorization in case
1531 * something went wrong the first time.
1532 */
1533 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1534 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1535 NL80211_IFTYPE_ADHOC);
1536 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1537 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1538 sta->rx_stats.last_rx = jiffies;
1539 if (ieee80211_is_data(hdr->frame_control) &&
1540 !is_multicast_ether_addr(hdr->addr1))
1541 sta->rx_stats.last_rate =
1542 sta_stats_encode_rate(status);
1543 }
1544 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1545 sta->rx_stats.last_rx = jiffies;
1546 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1547 /*
1548 * Mesh beacons will update last_rx when if they are found to
1549 * match the current local configuration when processed.
1550 */
1551 sta->rx_stats.last_rx = jiffies;
1552 if (ieee80211_is_data(hdr->frame_control))
1553 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
1554 }
1555
1556 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1557 ieee80211_sta_rx_notify(rx->sdata, hdr);
1558
1559 sta->rx_stats.fragments++;
1560
1561 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
1562 sta->rx_stats.bytes += rx->skb->len;
1563 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1564
1565 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1566 sta->rx_stats.last_signal = status->signal;
1567 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
1568 }
1569
1570 if (status->chains) {
1571 sta->rx_stats.chains = status->chains;
1572 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1573 int signal = status->chain_signal[i];
1574
1575 if (!(status->chains & BIT(i)))
1576 continue;
1577
1578 sta->rx_stats.chain_signal_last[i] = signal;
1579 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
1580 -signal);
1581 }
1582 }
1583
1584 /*
1585 * Change STA power saving mode only at the end of a frame
1586 * exchange sequence.
1587 */
1588 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1589 !ieee80211_has_morefrags(hdr->frame_control) &&
1590 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1591 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1592 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1593 /* PM bit is only checked in frames where it isn't reserved,
1594 * in AP mode it's reserved in non-bufferable management frames
1595 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1596 */
1597 (!ieee80211_is_mgmt(hdr->frame_control) ||
1598 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1599 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1600 if (!ieee80211_has_pm(hdr->frame_control))
1601 sta_ps_end(sta);
1602 } else {
1603 if (ieee80211_has_pm(hdr->frame_control))
1604 sta_ps_start(sta);
1605 }
1606 }
1607
1608 /* mesh power save support */
1609 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1610 ieee80211_mps_rx_h_sta_process(sta, hdr);
1611
1612 /*
1613 * Drop (qos-)data::nullfunc frames silently, since they
1614 * are used only to control station power saving mode.
1615 */
1616 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1617 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1618 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1619
1620 /*
1621 * If we receive a 4-addr nullfunc frame from a STA
1622 * that was not moved to a 4-addr STA vlan yet send
1623 * the event to userspace and for older hostapd drop
1624 * the frame to the monitor interface.
1625 */
1626 if (ieee80211_has_a4(hdr->frame_control) &&
1627 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1628 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1629 !rx->sdata->u.vlan.sta))) {
1630 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1631 cfg80211_rx_unexpected_4addr_frame(
1632 rx->sdata->dev, sta->sta.addr,
1633 GFP_ATOMIC);
1634 return RX_DROP_MONITOR;
1635 }
1636 /*
1637 * Update counter and free packet here to avoid
1638 * counting this as a dropped packed.
1639 */
1640 sta->rx_stats.packets++;
1641 dev_kfree_skb(rx->skb);
1642 return RX_QUEUED;
1643 }
1644
1645 return RX_CONTINUE;
1646} /* ieee80211_rx_h_sta_process */
1647
1648static ieee80211_rx_result debug_noinline
1649ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1650{
1651 struct sk_buff *skb = rx->skb;
1652 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1653 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1654 int keyidx;
1655 int hdrlen;
1656 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1657 struct ieee80211_key *sta_ptk = NULL;
1658 int mmie_keyidx = -1;
1659 __le16 fc;
1660 const struct ieee80211_cipher_scheme *cs = NULL;
1661
1662 /*
1663 * Key selection 101
1664 *
1665 * There are four types of keys:
1666 * - GTK (group keys)
1667 * - IGTK (group keys for management frames)
1668 * - PTK (pairwise keys)
1669 * - STK (station-to-station pairwise keys)
1670 *
1671 * When selecting a key, we have to distinguish between multicast
1672 * (including broadcast) and unicast frames, the latter can only
1673 * use PTKs and STKs while the former always use GTKs and IGTKs.
1674 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1675 * unicast frames can also use key indices like GTKs. Hence, if we
1676 * don't have a PTK/STK we check the key index for a WEP key.
1677 *
1678 * Note that in a regular BSS, multicast frames are sent by the
1679 * AP only, associated stations unicast the frame to the AP first
1680 * which then multicasts it on their behalf.
1681 *
1682 * There is also a slight problem in IBSS mode: GTKs are negotiated
1683 * with each station, that is something we don't currently handle.
1684 * The spec seems to expect that one negotiates the same key with
1685 * every station but there's no such requirement; VLANs could be
1686 * possible.
1687 */
1688
1689 /* start without a key */
1690 rx->key = NULL;
1691 fc = hdr->frame_control;
1692
1693 if (rx->sta) {
1694 int keyid = rx->sta->ptk_idx;
1695
1696 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1697 cs = rx->sta->cipher_scheme;
1698 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
1699 if (unlikely(keyid < 0))
1700 return RX_DROP_UNUSABLE;
1701 }
1702 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1703 }
1704
1705 if (!ieee80211_has_protected(fc))
1706 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1707
1708 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1709 rx->key = sta_ptk;
1710 if ((status->flag & RX_FLAG_DECRYPTED) &&
1711 (status->flag & RX_FLAG_IV_STRIPPED))
1712 return RX_CONTINUE;
1713 /* Skip decryption if the frame is not protected. */
1714 if (!ieee80211_has_protected(fc))
1715 return RX_CONTINUE;
1716 } else if (mmie_keyidx >= 0) {
1717 /* Broadcast/multicast robust management frame / BIP */
1718 if ((status->flag & RX_FLAG_DECRYPTED) &&
1719 (status->flag & RX_FLAG_IV_STRIPPED))
1720 return RX_CONTINUE;
1721
1722 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1723 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1724 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1725 if (rx->sta) {
1726 if (ieee80211_is_group_privacy_action(skb) &&
1727 test_sta_flag(rx->sta, WLAN_STA_MFP))
1728 return RX_DROP_MONITOR;
1729
1730 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1731 }
1732 if (!rx->key)
1733 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1734 } else if (!ieee80211_has_protected(fc)) {
1735 /*
1736 * The frame was not protected, so skip decryption. However, we
1737 * need to set rx->key if there is a key that could have been
1738 * used so that the frame may be dropped if encryption would
1739 * have been expected.
1740 */
1741 struct ieee80211_key *key = NULL;
1742 struct ieee80211_sub_if_data *sdata = rx->sdata;
1743 int i;
1744
1745 if (ieee80211_is_mgmt(fc) &&
1746 is_multicast_ether_addr(hdr->addr1) &&
1747 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1748 rx->key = key;
1749 else {
1750 if (rx->sta) {
1751 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1752 key = rcu_dereference(rx->sta->gtk[i]);
1753 if (key)
1754 break;
1755 }
1756 }
1757 if (!key) {
1758 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1759 key = rcu_dereference(sdata->keys[i]);
1760 if (key)
1761 break;
1762 }
1763 }
1764 if (key)
1765 rx->key = key;
1766 }
1767 return RX_CONTINUE;
1768 } else {
1769 u8 keyid;
1770
1771 /*
1772 * The device doesn't give us the IV so we won't be
1773 * able to look up the key. That's ok though, we
1774 * don't need to decrypt the frame, we just won't
1775 * be able to keep statistics accurate.
1776 * Except for key threshold notifications, should
1777 * we somehow allow the driver to tell us which key
1778 * the hardware used if this flag is set?
1779 */
1780 if ((status->flag & RX_FLAG_DECRYPTED) &&
1781 (status->flag & RX_FLAG_IV_STRIPPED))
1782 return RX_CONTINUE;
1783
1784 hdrlen = ieee80211_hdrlen(fc);
1785
1786 if (cs) {
1787 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
1788
1789 if (unlikely(keyidx < 0))
1790 return RX_DROP_UNUSABLE;
1791 } else {
1792 if (rx->skb->len < 8 + hdrlen)
1793 return RX_DROP_UNUSABLE; /* TODO: count this? */
1794 /*
1795 * no need to call ieee80211_wep_get_keyidx,
1796 * it verifies a bunch of things we've done already
1797 */
1798 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1799 keyidx = keyid >> 6;
1800 }
1801
1802 /* check per-station GTK first, if multicast packet */
1803 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1804 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1805
1806 /* if not found, try default key */
1807 if (!rx->key) {
1808 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1809
1810 /*
1811 * RSNA-protected unicast frames should always be
1812 * sent with pairwise or station-to-station keys,
1813 * but for WEP we allow using a key index as well.
1814 */
1815 if (rx->key &&
1816 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1817 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1818 !is_multicast_ether_addr(hdr->addr1))
1819 rx->key = NULL;
1820 }
1821 }
1822
1823 if (rx->key) {
1824 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1825 return RX_DROP_MONITOR;
1826
1827 /* TODO: add threshold stuff again */
1828 } else {
1829 return RX_DROP_MONITOR;
1830 }
1831
1832 switch (rx->key->conf.cipher) {
1833 case WLAN_CIPHER_SUITE_WEP40:
1834 case WLAN_CIPHER_SUITE_WEP104:
1835 result = ieee80211_crypto_wep_decrypt(rx);
1836 break;
1837 case WLAN_CIPHER_SUITE_TKIP:
1838 result = ieee80211_crypto_tkip_decrypt(rx);
1839 break;
1840 case WLAN_CIPHER_SUITE_CCMP:
1841 result = ieee80211_crypto_ccmp_decrypt(
1842 rx, IEEE80211_CCMP_MIC_LEN);
1843 break;
1844 case WLAN_CIPHER_SUITE_CCMP_256:
1845 result = ieee80211_crypto_ccmp_decrypt(
1846 rx, IEEE80211_CCMP_256_MIC_LEN);
1847 break;
1848 case WLAN_CIPHER_SUITE_AES_CMAC:
1849 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1850 break;
1851 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1852 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1853 break;
1854 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1855 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1856 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1857 break;
1858 case WLAN_CIPHER_SUITE_GCMP:
1859 case WLAN_CIPHER_SUITE_GCMP_256:
1860 result = ieee80211_crypto_gcmp_decrypt(rx);
1861 break;
1862 default:
1863 result = ieee80211_crypto_hw_decrypt(rx);
1864 }
1865
1866 /* the hdr variable is invalid after the decrypt handlers */
1867
1868 /* either the frame has been decrypted or will be dropped */
1869 status->flag |= RX_FLAG_DECRYPTED;
1870
1871 return result;
1872}
1873
1874static inline struct ieee80211_fragment_entry *
1875ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1876 unsigned int frag, unsigned int seq, int rx_queue,
1877 struct sk_buff **skb)
1878{
1879 struct ieee80211_fragment_entry *entry;
1880
1881 entry = &sdata->fragments[sdata->fragment_next++];
1882 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1883 sdata->fragment_next = 0;
1884
1885 if (!skb_queue_empty(&entry->skb_list))
1886 __skb_queue_purge(&entry->skb_list);
1887
1888 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1889 *skb = NULL;
1890 entry->first_frag_time = jiffies;
1891 entry->seq = seq;
1892 entry->rx_queue = rx_queue;
1893 entry->last_frag = frag;
1894 entry->check_sequential_pn = false;
1895 entry->extra_len = 0;
1896
1897 return entry;
1898}
1899
1900static inline struct ieee80211_fragment_entry *
1901ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1902 unsigned int frag, unsigned int seq,
1903 int rx_queue, struct ieee80211_hdr *hdr)
1904{
1905 struct ieee80211_fragment_entry *entry;
1906 int i, idx;
1907
1908 idx = sdata->fragment_next;
1909 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1910 struct ieee80211_hdr *f_hdr;
1911
1912 idx--;
1913 if (idx < 0)
1914 idx = IEEE80211_FRAGMENT_MAX - 1;
1915
1916 entry = &sdata->fragments[idx];
1917 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1918 entry->rx_queue != rx_queue ||
1919 entry->last_frag + 1 != frag)
1920 continue;
1921
1922 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1923
1924 /*
1925 * Check ftype and addresses are equal, else check next fragment
1926 */
1927 if (((hdr->frame_control ^ f_hdr->frame_control) &
1928 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1929 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1930 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1931 continue;
1932
1933 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1934 __skb_queue_purge(&entry->skb_list);
1935 continue;
1936 }
1937 return entry;
1938 }
1939
1940 return NULL;
1941}
1942
1943static ieee80211_rx_result debug_noinline
1944ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1945{
1946 struct ieee80211_hdr *hdr;
1947 u16 sc;
1948 __le16 fc;
1949 unsigned int frag, seq;
1950 struct ieee80211_fragment_entry *entry;
1951 struct sk_buff *skb;
1952 struct ieee80211_rx_status *status;
1953
1954 hdr = (struct ieee80211_hdr *)rx->skb->data;
1955 fc = hdr->frame_control;
1956
1957 if (ieee80211_is_ctl(fc))
1958 return RX_CONTINUE;
1959
1960 sc = le16_to_cpu(hdr->seq_ctrl);
1961 frag = sc & IEEE80211_SCTL_FRAG;
1962
1963 if (is_multicast_ether_addr(hdr->addr1)) {
1964 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1965 goto out_no_led;
1966 }
1967
1968 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1969 goto out;
1970
1971 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1972
1973 if (skb_linearize(rx->skb))
1974 return RX_DROP_UNUSABLE;
1975
1976 /*
1977 * skb_linearize() might change the skb->data and
1978 * previously cached variables (in this case, hdr) need to
1979 * be refreshed with the new data.
1980 */
1981 hdr = (struct ieee80211_hdr *)rx->skb->data;
1982 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1983
1984 if (frag == 0) {
1985 /* This is the first fragment of a new frame. */
1986 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1987 rx->seqno_idx, &(rx->skb));
1988 if (rx->key &&
1989 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1990 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1991 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1992 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1993 ieee80211_has_protected(fc)) {
1994 int queue = rx->security_idx;
1995
1996 /* Store CCMP/GCMP PN so that we can verify that the
1997 * next fragment has a sequential PN value.
1998 */
1999 entry->check_sequential_pn = true;
2000 memcpy(entry->last_pn,
2001 rx->key->u.ccmp.rx_pn[queue],
2002 IEEE80211_CCMP_PN_LEN);
2003 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2004 u.ccmp.rx_pn) !=
2005 offsetof(struct ieee80211_key,
2006 u.gcmp.rx_pn));
2007 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2008 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2009 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2010 IEEE80211_GCMP_PN_LEN);
2011 }
2012 return RX_QUEUED;
2013 }
2014
2015 /* This is a fragment for a frame that should already be pending in
2016 * fragment cache. Add this fragment to the end of the pending entry.
2017 */
2018 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2019 rx->seqno_idx, hdr);
2020 if (!entry) {
2021 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2022 return RX_DROP_MONITOR;
2023 }
2024
2025 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2026 * MPDU PN values are not incrementing in steps of 1."
2027 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2028 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2029 */
2030 if (entry->check_sequential_pn) {
2031 int i;
2032 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
2033 int queue;
2034
2035 if (!rx->key ||
2036 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
2037 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2038 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2039 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
2040 return RX_DROP_UNUSABLE;
2041 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2042 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
2043 pn[i]++;
2044 if (pn[i])
2045 break;
2046 }
2047 queue = rx->security_idx;
2048 rpn = rx->key->u.ccmp.rx_pn[queue];
2049 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
2050 return RX_DROP_UNUSABLE;
2051 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
2052 }
2053
2054 skb_pull(rx->skb, ieee80211_hdrlen(fc));
2055 __skb_queue_tail(&entry->skb_list, rx->skb);
2056 entry->last_frag = frag;
2057 entry->extra_len += rx->skb->len;
2058 if (ieee80211_has_morefrags(fc)) {
2059 rx->skb = NULL;
2060 return RX_QUEUED;
2061 }
2062
2063 rx->skb = __skb_dequeue(&entry->skb_list);
2064 if (skb_tailroom(rx->skb) < entry->extra_len) {
2065 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
2066 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2067 GFP_ATOMIC))) {
2068 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2069 __skb_queue_purge(&entry->skb_list);
2070 return RX_DROP_UNUSABLE;
2071 }
2072 }
2073 while ((skb = __skb_dequeue(&entry->skb_list))) {
2074 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2075 dev_kfree_skb(skb);
2076 }
2077
2078 /* Complete frame has been reassembled - process it now */
2079 status = IEEE80211_SKB_RXCB(rx->skb);
2080
2081 out:
2082 ieee80211_led_rx(rx->local);
2083 out_no_led:
2084 if (rx->sta)
2085 rx->sta->rx_stats.packets++;
2086 return RX_CONTINUE;
2087}
2088
2089static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
2090{
2091 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
2092 return -EACCES;
2093
2094 return 0;
2095}
2096
2097static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
2098{
2099 struct sk_buff *skb = rx->skb;
2100 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2101
2102 /*
2103 * Pass through unencrypted frames if the hardware has
2104 * decrypted them already.
2105 */
2106 if (status->flag & RX_FLAG_DECRYPTED)
2107 return 0;
2108
2109 /* Drop unencrypted frames if key is set. */
2110 if (unlikely(!ieee80211_has_protected(fc) &&
2111 !ieee80211_is_nullfunc(fc) &&
2112 ieee80211_is_data(fc) && rx->key))
2113 return -EACCES;
2114
2115 return 0;
2116}
2117
2118static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2119{
2120 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2122 __le16 fc = hdr->frame_control;
2123
2124 /*
2125 * Pass through unencrypted frames if the hardware has
2126 * decrypted them already.
2127 */
2128 if (status->flag & RX_FLAG_DECRYPTED)
2129 return 0;
2130
2131 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2132 if (unlikely(!ieee80211_has_protected(fc) &&
2133 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2134 rx->key)) {
2135 if (ieee80211_is_deauth(fc) ||
2136 ieee80211_is_disassoc(fc))
2137 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2138 rx->skb->data,
2139 rx->skb->len);
2140 return -EACCES;
2141 }
2142 /* BIP does not use Protected field, so need to check MMIE */
2143 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2144 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2145 if (ieee80211_is_deauth(fc) ||
2146 ieee80211_is_disassoc(fc))
2147 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2148 rx->skb->data,
2149 rx->skb->len);
2150 return -EACCES;
2151 }
2152 /*
2153 * When using MFP, Action frames are not allowed prior to
2154 * having configured keys.
2155 */
2156 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2157 ieee80211_is_robust_mgmt_frame(rx->skb)))
2158 return -EACCES;
2159 }
2160
2161 return 0;
2162}
2163
2164static int
2165__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2166{
2167 struct ieee80211_sub_if_data *sdata = rx->sdata;
2168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2169 bool check_port_control = false;
2170 struct ethhdr *ehdr;
2171 int ret;
2172
2173 *port_control = false;
2174 if (ieee80211_has_a4(hdr->frame_control) &&
2175 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2176 return -1;
2177
2178 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2179 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2180
2181 if (!sdata->u.mgd.use_4addr)
2182 return -1;
2183 else
2184 check_port_control = true;
2185 }
2186
2187 if (is_multicast_ether_addr(hdr->addr1) &&
2188 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2189 return -1;
2190
2191 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2192 if (ret < 0)
2193 return ret;
2194
2195 ehdr = (struct ethhdr *) rx->skb->data;
2196 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2197 *port_control = true;
2198 else if (check_port_control)
2199 return -1;
2200
2201 return 0;
2202}
2203
2204/*
2205 * requires that rx->skb is a frame with ethernet header
2206 */
2207static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2208{
2209 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2210 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2211 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2212
2213 /*
2214 * Allow EAPOL frames to us/the PAE group address regardless
2215 * of whether the frame was encrypted or not.
2216 */
2217 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2218 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2219 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2220 return true;
2221
2222 if (ieee80211_802_1x_port_control(rx) ||
2223 ieee80211_drop_unencrypted(rx, fc))
2224 return false;
2225
2226 return true;
2227}
2228
2229/*
2230 * requires that rx->skb is a frame with ethernet header
2231 */
2232static void
2233ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2234{
2235 struct ieee80211_sub_if_data *sdata = rx->sdata;
2236 struct net_device *dev = sdata->dev;
2237 struct sk_buff *skb, *xmit_skb;
2238 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2239 struct sta_info *dsta;
2240
2241 skb = rx->skb;
2242 xmit_skb = NULL;
2243
2244 ieee80211_rx_stats(dev, skb->len);
2245
2246 if (rx->sta) {
2247 /* The seqno index has the same property as needed
2248 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2249 * for non-QoS-data frames. Here we know it's a data
2250 * frame, so count MSDUs.
2251 */
2252 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
2253 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2254 u64_stats_update_end(&rx->sta->rx_stats.syncp);
2255 }
2256
2257 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2258 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2259 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2260 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2261 if (is_multicast_ether_addr(ehdr->h_dest) &&
2262 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
2263 /*
2264 * send multicast frames both to higher layers in
2265 * local net stack and back to the wireless medium
2266 */
2267 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2268 if (!xmit_skb)
2269 net_info_ratelimited("%s: failed to clone multicast frame\n",
2270 dev->name);
2271 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
2272 dsta = sta_info_get(sdata, skb->data);
2273 if (dsta) {
2274 /*
2275 * The destination station is associated to
2276 * this AP (in this VLAN), so send the frame
2277 * directly to it and do not pass it to local
2278 * net stack.
2279 */
2280 xmit_skb = skb;
2281 skb = NULL;
2282 }
2283 }
2284 }
2285
2286#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2287 if (skb) {
2288 /* 'align' will only take the values 0 or 2 here since all
2289 * frames are required to be aligned to 2-byte boundaries
2290 * when being passed to mac80211; the code here works just
2291 * as well if that isn't true, but mac80211 assumes it can
2292 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2293 */
2294 int align;
2295
2296 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2297 if (align) {
2298 if (WARN_ON(skb_headroom(skb) < 3)) {
2299 dev_kfree_skb(skb);
2300 skb = NULL;
2301 } else {
2302 u8 *data = skb->data;
2303 size_t len = skb_headlen(skb);
2304 skb->data -= align;
2305 memmove(skb->data, data, len);
2306 skb_set_tail_pointer(skb, len);
2307 }
2308 }
2309 }
2310#endif
2311
2312 if (skb) {
2313 /* deliver to local stack */
2314 skb->protocol = eth_type_trans(skb, dev);
2315 memset(skb->cb, 0, sizeof(skb->cb));
2316 if (rx->napi)
2317 napi_gro_receive(rx->napi, skb);
2318 else
2319 netif_receive_skb(skb);
2320 }
2321
2322 if (xmit_skb) {
2323 /*
2324 * Send to wireless media and increase priority by 256 to
2325 * keep the received priority instead of reclassifying
2326 * the frame (see cfg80211_classify8021d).
2327 */
2328 xmit_skb->priority += 256;
2329 xmit_skb->protocol = htons(ETH_P_802_3);
2330 skb_reset_network_header(xmit_skb);
2331 skb_reset_mac_header(xmit_skb);
2332 dev_queue_xmit(xmit_skb);
2333 }
2334}
2335
2336static ieee80211_rx_result debug_noinline
2337ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2338{
2339 struct net_device *dev = rx->sdata->dev;
2340 struct sk_buff *skb = rx->skb;
2341 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2342 __le16 fc = hdr->frame_control;
2343 struct sk_buff_head frame_list;
2344 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2345 struct ethhdr ethhdr;
2346 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
2347
2348 if (unlikely(!ieee80211_is_data(fc)))
2349 return RX_CONTINUE;
2350
2351 if (unlikely(!ieee80211_is_data_present(fc)))
2352 return RX_DROP_MONITOR;
2353
2354 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2355 return RX_CONTINUE;
2356
2357 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2358 switch (rx->sdata->vif.type) {
2359 case NL80211_IFTYPE_AP_VLAN:
2360 if (!rx->sdata->u.vlan.sta)
2361 return RX_DROP_UNUSABLE;
2362 break;
2363 case NL80211_IFTYPE_STATION:
2364 if (!rx->sdata->u.mgd.use_4addr)
2365 return RX_DROP_UNUSABLE;
2366 break;
2367 default:
2368 return RX_DROP_UNUSABLE;
2369 }
2370 check_da = NULL;
2371 check_sa = NULL;
2372 } else switch (rx->sdata->vif.type) {
2373 case NL80211_IFTYPE_AP:
2374 case NL80211_IFTYPE_AP_VLAN:
2375 check_da = NULL;
2376 break;
2377 case NL80211_IFTYPE_STATION:
2378 if (!rx->sta ||
2379 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2380 check_sa = NULL;
2381 break;
2382 case NL80211_IFTYPE_MESH_POINT:
2383 check_sa = NULL;
2384 break;
2385 default:
2386 break;
2387 }
2388
2389 if (is_multicast_ether_addr(hdr->addr1))
2390 return RX_DROP_UNUSABLE;
2391
2392 skb->dev = dev;
2393 __skb_queue_head_init(&frame_list);
2394
2395 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2396 rx->sdata->vif.addr,
2397 rx->sdata->vif.type))
2398 return RX_DROP_UNUSABLE;
2399
2400 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2401 rx->sdata->vif.type,
2402 rx->local->hw.extra_tx_headroom,
2403 check_da, check_sa);
2404
2405 while (!skb_queue_empty(&frame_list)) {
2406 rx->skb = __skb_dequeue(&frame_list);
2407
2408 if (!ieee80211_frame_allowed(rx, fc)) {
2409 dev_kfree_skb(rx->skb);
2410 continue;
2411 }
2412
2413 ieee80211_deliver_skb(rx);
2414 }
2415
2416 return RX_QUEUED;
2417}
2418
2419#ifdef CONFIG_MAC80211_MESH
2420static ieee80211_rx_result
2421ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2422{
2423 struct ieee80211_hdr *fwd_hdr, *hdr;
2424 struct ieee80211_tx_info *info;
2425 struct ieee80211s_hdr *mesh_hdr;
2426 struct sk_buff *skb = rx->skb, *fwd_skb;
2427 struct ieee80211_local *local = rx->local;
2428 struct ieee80211_sub_if_data *sdata = rx->sdata;
2429 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2430 u16 ac, q, hdrlen;
2431
2432 hdr = (struct ieee80211_hdr *) skb->data;
2433 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2434
2435 /* make sure fixed part of mesh header is there, also checks skb len */
2436 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2437 return RX_DROP_MONITOR;
2438
2439 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2440
2441 /* make sure full mesh header is there, also checks skb len */
2442 if (!pskb_may_pull(rx->skb,
2443 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2444 return RX_DROP_MONITOR;
2445
2446 /* reload pointers */
2447 hdr = (struct ieee80211_hdr *) skb->data;
2448 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2449
2450 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2451 return RX_DROP_MONITOR;
2452
2453 /* frame is in RMC, don't forward */
2454 if (ieee80211_is_data(hdr->frame_control) &&
2455 is_multicast_ether_addr(hdr->addr1) &&
2456 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2457 return RX_DROP_MONITOR;
2458
2459 if (!ieee80211_is_data(hdr->frame_control))
2460 return RX_CONTINUE;
2461
2462 if (!mesh_hdr->ttl)
2463 return RX_DROP_MONITOR;
2464
2465 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2466 struct mesh_path *mppath;
2467 char *proxied_addr;
2468 char *mpp_addr;
2469
2470 if (is_multicast_ether_addr(hdr->addr1)) {
2471 mpp_addr = hdr->addr3;
2472 proxied_addr = mesh_hdr->eaddr1;
2473 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2474 /* has_a4 already checked in ieee80211_rx_mesh_check */
2475 mpp_addr = hdr->addr4;
2476 proxied_addr = mesh_hdr->eaddr2;
2477 } else {
2478 return RX_DROP_MONITOR;
2479 }
2480
2481 rcu_read_lock();
2482 mppath = mpp_path_lookup(sdata, proxied_addr);
2483 if (!mppath) {
2484 mpp_path_add(sdata, proxied_addr, mpp_addr);
2485 } else {
2486 spin_lock_bh(&mppath->state_lock);
2487 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2488 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2489 mppath->exp_time = jiffies;
2490 spin_unlock_bh(&mppath->state_lock);
2491 }
2492 rcu_read_unlock();
2493 }
2494
2495 /* Frame has reached destination. Don't forward */
2496 if (!is_multicast_ether_addr(hdr->addr1) &&
2497 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2498 return RX_CONTINUE;
2499
2500 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2501 q = sdata->vif.hw_queue[ac];
2502 if (ieee80211_queue_stopped(&local->hw, q)) {
2503 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2504 return RX_DROP_MONITOR;
2505 }
2506 skb_set_queue_mapping(skb, q);
2507
2508 if (!--mesh_hdr->ttl) {
2509 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2510 goto out;
2511 }
2512
2513 if (!ifmsh->mshcfg.dot11MeshForwarding)
2514 goto out;
2515
2516 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2517 sdata->encrypt_headroom, 0, GFP_ATOMIC);
2518 if (!fwd_skb) {
2519 net_info_ratelimited("%s: failed to clone mesh frame\n",
2520 sdata->name);
2521 goto out;
2522 }
2523
2524 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2525 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2526 info = IEEE80211_SKB_CB(fwd_skb);
2527 memset(info, 0, sizeof(*info));
2528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2529 info->control.vif = &rx->sdata->vif;
2530 info->control.jiffies = jiffies;
2531 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2532 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2533 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2534 /* update power mode indication when forwarding */
2535 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2536 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2537 /* mesh power mode flags updated in mesh_nexthop_lookup */
2538 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2539 } else {
2540 /* unable to resolve next hop */
2541 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2542 fwd_hdr->addr3, 0,
2543 WLAN_REASON_MESH_PATH_NOFORWARD,
2544 fwd_hdr->addr2);
2545 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2546 kfree_skb(fwd_skb);
2547 return RX_DROP_MONITOR;
2548 }
2549
2550 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2551 ieee80211_add_pending_skb(local, fwd_skb);
2552 out:
2553 if (is_multicast_ether_addr(hdr->addr1))
2554 return RX_CONTINUE;
2555 return RX_DROP_MONITOR;
2556}
2557#endif
2558
2559static ieee80211_rx_result debug_noinline
2560ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2561{
2562 struct ieee80211_sub_if_data *sdata = rx->sdata;
2563 struct ieee80211_local *local = rx->local;
2564 struct net_device *dev = sdata->dev;
2565 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2566 __le16 fc = hdr->frame_control;
2567 bool port_control;
2568 int err;
2569
2570 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2571 return RX_CONTINUE;
2572
2573 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2574 return RX_DROP_MONITOR;
2575
2576 /*
2577 * Send unexpected-4addr-frame event to hostapd. For older versions,
2578 * also drop the frame to cooked monitor interfaces.
2579 */
2580 if (ieee80211_has_a4(hdr->frame_control) &&
2581 sdata->vif.type == NL80211_IFTYPE_AP) {
2582 if (rx->sta &&
2583 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2584 cfg80211_rx_unexpected_4addr_frame(
2585 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2586 return RX_DROP_MONITOR;
2587 }
2588
2589 err = __ieee80211_data_to_8023(rx, &port_control);
2590 if (unlikely(err))
2591 return RX_DROP_UNUSABLE;
2592
2593 if (!ieee80211_frame_allowed(rx, fc))
2594 return RX_DROP_MONITOR;
2595
2596 /* directly handle TDLS channel switch requests/responses */
2597 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2598 cpu_to_be16(ETH_P_TDLS))) {
2599 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2600
2601 if (pskb_may_pull(rx->skb,
2602 offsetof(struct ieee80211_tdls_data, u)) &&
2603 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2604 tf->category == WLAN_CATEGORY_TDLS &&
2605 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2606 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2607 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2608 schedule_work(&local->tdls_chsw_work);
2609 if (rx->sta)
2610 rx->sta->rx_stats.packets++;
2611
2612 return RX_QUEUED;
2613 }
2614 }
2615
2616 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2617 unlikely(port_control) && sdata->bss) {
2618 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2619 u.ap);
2620 dev = sdata->dev;
2621 rx->sdata = sdata;
2622 }
2623
2624 rx->skb->dev = dev;
2625
2626 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2627 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2628 !is_multicast_ether_addr(
2629 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2630 (!local->scanning &&
2631 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2632 mod_timer(&local->dynamic_ps_timer, jiffies +
2633 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2634
2635 ieee80211_deliver_skb(rx);
2636
2637 return RX_QUEUED;
2638}
2639
2640static ieee80211_rx_result debug_noinline
2641ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2642{
2643 struct sk_buff *skb = rx->skb;
2644 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2645 struct tid_ampdu_rx *tid_agg_rx;
2646 u16 start_seq_num;
2647 u16 tid;
2648
2649 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2650 return RX_CONTINUE;
2651
2652 if (ieee80211_is_back_req(bar->frame_control)) {
2653 struct {
2654 __le16 control, start_seq_num;
2655 } __packed bar_data;
2656 struct ieee80211_event event = {
2657 .type = BAR_RX_EVENT,
2658 };
2659
2660 if (!rx->sta)
2661 return RX_DROP_MONITOR;
2662
2663 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2664 &bar_data, sizeof(bar_data)))
2665 return RX_DROP_MONITOR;
2666
2667 tid = le16_to_cpu(bar_data.control) >> 12;
2668
2669 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2670 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2671 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2672 WLAN_BACK_RECIPIENT,
2673 WLAN_REASON_QSTA_REQUIRE_SETUP);
2674
2675 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2676 if (!tid_agg_rx)
2677 return RX_DROP_MONITOR;
2678
2679 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2680 event.u.ba.tid = tid;
2681 event.u.ba.ssn = start_seq_num;
2682 event.u.ba.sta = &rx->sta->sta;
2683
2684 /* reset session timer */
2685 if (tid_agg_rx->timeout)
2686 mod_timer(&tid_agg_rx->session_timer,
2687 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2688
2689 spin_lock(&tid_agg_rx->reorder_lock);
2690 /* release stored frames up to start of BAR */
2691 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2692 start_seq_num, frames);
2693 spin_unlock(&tid_agg_rx->reorder_lock);
2694
2695 drv_event_callback(rx->local, rx->sdata, &event);
2696
2697 kfree_skb(skb);
2698 return RX_QUEUED;
2699 }
2700
2701 /*
2702 * After this point, we only want management frames,
2703 * so we can drop all remaining control frames to
2704 * cooked monitor interfaces.
2705 */
2706 return RX_DROP_MONITOR;
2707}
2708
2709static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2710 struct ieee80211_mgmt *mgmt,
2711 size_t len)
2712{
2713 struct ieee80211_local *local = sdata->local;
2714 struct sk_buff *skb;
2715 struct ieee80211_mgmt *resp;
2716
2717 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2718 /* Not to own unicast address */
2719 return;
2720 }
2721
2722 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2723 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2724 /* Not from the current AP or not associated yet. */
2725 return;
2726 }
2727
2728 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2729 /* Too short SA Query request frame */
2730 return;
2731 }
2732
2733 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2734 if (skb == NULL)
2735 return;
2736
2737 skb_reserve(skb, local->hw.extra_tx_headroom);
2738 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2739 memset(resp, 0, 24);
2740 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2741 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2742 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2743 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2744 IEEE80211_STYPE_ACTION);
2745 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2746 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2747 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2748 memcpy(resp->u.action.u.sa_query.trans_id,
2749 mgmt->u.action.u.sa_query.trans_id,
2750 WLAN_SA_QUERY_TR_ID_LEN);
2751
2752 ieee80211_tx_skb(sdata, skb);
2753}
2754
2755static ieee80211_rx_result debug_noinline
2756ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2757{
2758 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2759 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2760
2761 /*
2762 * From here on, look only at management frames.
2763 * Data and control frames are already handled,
2764 * and unknown (reserved) frames are useless.
2765 */
2766 if (rx->skb->len < 24)
2767 return RX_DROP_MONITOR;
2768
2769 if (!ieee80211_is_mgmt(mgmt->frame_control))
2770 return RX_DROP_MONITOR;
2771
2772 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2773 ieee80211_is_beacon(mgmt->frame_control) &&
2774 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2775 int sig = 0;
2776
2777 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2778 sig = status->signal;
2779
2780 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2781 rx->skb->data, rx->skb->len,
2782 status->freq, sig);
2783 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2784 }
2785
2786 if (ieee80211_drop_unencrypted_mgmt(rx))
2787 return RX_DROP_UNUSABLE;
2788
2789 return RX_CONTINUE;
2790}
2791
2792static ieee80211_rx_result debug_noinline
2793ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2794{
2795 struct ieee80211_local *local = rx->local;
2796 struct ieee80211_sub_if_data *sdata = rx->sdata;
2797 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2798 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2799 int len = rx->skb->len;
2800
2801 if (!ieee80211_is_action(mgmt->frame_control))
2802 return RX_CONTINUE;
2803
2804 /* drop too small frames */
2805 if (len < IEEE80211_MIN_ACTION_SIZE)
2806 return RX_DROP_UNUSABLE;
2807
2808 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2809 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2810 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2811 return RX_DROP_UNUSABLE;
2812
2813 switch (mgmt->u.action.category) {
2814 case WLAN_CATEGORY_HT:
2815 /* reject HT action frames from stations not supporting HT */
2816 if (!rx->sta->sta.ht_cap.ht_supported)
2817 goto invalid;
2818
2819 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2820 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2821 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2822 sdata->vif.type != NL80211_IFTYPE_AP &&
2823 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2824 break;
2825
2826 /* verify action & smps_control/chanwidth are present */
2827 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2828 goto invalid;
2829
2830 switch (mgmt->u.action.u.ht_smps.action) {
2831 case WLAN_HT_ACTION_SMPS: {
2832 struct ieee80211_supported_band *sband;
2833 enum ieee80211_smps_mode smps_mode;
2834
2835 /* convert to HT capability */
2836 switch (mgmt->u.action.u.ht_smps.smps_control) {
2837 case WLAN_HT_SMPS_CONTROL_DISABLED:
2838 smps_mode = IEEE80211_SMPS_OFF;
2839 break;
2840 case WLAN_HT_SMPS_CONTROL_STATIC:
2841 smps_mode = IEEE80211_SMPS_STATIC;
2842 break;
2843 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2844 smps_mode = IEEE80211_SMPS_DYNAMIC;
2845 break;
2846 default:
2847 goto invalid;
2848 }
2849
2850 /* if no change do nothing */
2851 if (rx->sta->sta.smps_mode == smps_mode)
2852 goto handled;
2853 rx->sta->sta.smps_mode = smps_mode;
2854
2855 sband = rx->local->hw.wiphy->bands[status->band];
2856
2857 rate_control_rate_update(local, sband, rx->sta,
2858 IEEE80211_RC_SMPS_CHANGED);
2859 goto handled;
2860 }
2861 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2862 struct ieee80211_supported_band *sband;
2863 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2864 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2865
2866 /* If it doesn't support 40 MHz it can't change ... */
2867 if (!(rx->sta->sta.ht_cap.cap &
2868 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2869 goto handled;
2870
2871 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2872 max_bw = IEEE80211_STA_RX_BW_20;
2873 else
2874 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2875
2876 /* set cur_max_bandwidth and recalc sta bw */
2877 rx->sta->cur_max_bandwidth = max_bw;
2878 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2879
2880 if (rx->sta->sta.bandwidth == new_bw)
2881 goto handled;
2882
2883 rx->sta->sta.bandwidth = new_bw;
2884 sband = rx->local->hw.wiphy->bands[status->band];
2885
2886 rate_control_rate_update(local, sband, rx->sta,
2887 IEEE80211_RC_BW_CHANGED);
2888 goto handled;
2889 }
2890 default:
2891 goto invalid;
2892 }
2893
2894 break;
2895 case WLAN_CATEGORY_PUBLIC:
2896 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2897 goto invalid;
2898 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2899 break;
2900 if (!rx->sta)
2901 break;
2902 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2903 break;
2904 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2905 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2906 break;
2907 if (len < offsetof(struct ieee80211_mgmt,
2908 u.action.u.ext_chan_switch.variable))
2909 goto invalid;
2910 goto queue;
2911 case WLAN_CATEGORY_VHT:
2912 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2913 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2914 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2915 sdata->vif.type != NL80211_IFTYPE_AP &&
2916 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2917 break;
2918
2919 /* verify action code is present */
2920 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2921 goto invalid;
2922
2923 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2924 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2925 /* verify opmode is present */
2926 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2927 goto invalid;
2928 goto queue;
2929 }
2930 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2931 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2932 goto invalid;
2933 goto queue;
2934 }
2935 default:
2936 break;
2937 }
2938 break;
2939 case WLAN_CATEGORY_BACK:
2940 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2941 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2942 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2943 sdata->vif.type != NL80211_IFTYPE_AP &&
2944 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2945 break;
2946
2947 /* verify action_code is present */
2948 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2949 break;
2950
2951 switch (mgmt->u.action.u.addba_req.action_code) {
2952 case WLAN_ACTION_ADDBA_REQ:
2953 if (len < (IEEE80211_MIN_ACTION_SIZE +
2954 sizeof(mgmt->u.action.u.addba_req)))
2955 goto invalid;
2956 break;
2957 case WLAN_ACTION_ADDBA_RESP:
2958 if (len < (IEEE80211_MIN_ACTION_SIZE +
2959 sizeof(mgmt->u.action.u.addba_resp)))
2960 goto invalid;
2961 break;
2962 case WLAN_ACTION_DELBA:
2963 if (len < (IEEE80211_MIN_ACTION_SIZE +
2964 sizeof(mgmt->u.action.u.delba)))
2965 goto invalid;
2966 break;
2967 default:
2968 goto invalid;
2969 }
2970
2971 goto queue;
2972 case WLAN_CATEGORY_SPECTRUM_MGMT:
2973 /* verify action_code is present */
2974 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2975 break;
2976
2977 switch (mgmt->u.action.u.measurement.action_code) {
2978 case WLAN_ACTION_SPCT_MSR_REQ:
2979 if (status->band != NL80211_BAND_5GHZ)
2980 break;
2981
2982 if (len < (IEEE80211_MIN_ACTION_SIZE +
2983 sizeof(mgmt->u.action.u.measurement)))
2984 break;
2985
2986 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2987 break;
2988
2989 ieee80211_process_measurement_req(sdata, mgmt, len);
2990 goto handled;
2991 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2992 u8 *bssid;
2993 if (len < (IEEE80211_MIN_ACTION_SIZE +
2994 sizeof(mgmt->u.action.u.chan_switch)))
2995 break;
2996
2997 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2998 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2999 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3000 break;
3001
3002 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3003 bssid = sdata->u.mgd.bssid;
3004 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3005 bssid = sdata->u.ibss.bssid;
3006 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3007 bssid = mgmt->sa;
3008 else
3009 break;
3010
3011 if (!ether_addr_equal(mgmt->bssid, bssid))
3012 break;
3013
3014 goto queue;
3015 }
3016 }
3017 break;
3018 case WLAN_CATEGORY_SA_QUERY:
3019 if (len < (IEEE80211_MIN_ACTION_SIZE +
3020 sizeof(mgmt->u.action.u.sa_query)))
3021 break;
3022
3023 switch (mgmt->u.action.u.sa_query.action) {
3024 case WLAN_ACTION_SA_QUERY_REQUEST:
3025 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3026 break;
3027 ieee80211_process_sa_query_req(sdata, mgmt, len);
3028 goto handled;
3029 }
3030 break;
3031 case WLAN_CATEGORY_SELF_PROTECTED:
3032 if (len < (IEEE80211_MIN_ACTION_SIZE +
3033 sizeof(mgmt->u.action.u.self_prot.action_code)))
3034 break;
3035
3036 switch (mgmt->u.action.u.self_prot.action_code) {
3037 case WLAN_SP_MESH_PEERING_OPEN:
3038 case WLAN_SP_MESH_PEERING_CLOSE:
3039 case WLAN_SP_MESH_PEERING_CONFIRM:
3040 if (!ieee80211_vif_is_mesh(&sdata->vif))
3041 goto invalid;
3042 if (sdata->u.mesh.user_mpm)
3043 /* userspace handles this frame */
3044 break;
3045 goto queue;
3046 case WLAN_SP_MGK_INFORM:
3047 case WLAN_SP_MGK_ACK:
3048 if (!ieee80211_vif_is_mesh(&sdata->vif))
3049 goto invalid;
3050 break;
3051 }
3052 break;
3053 case WLAN_CATEGORY_MESH_ACTION:
3054 if (len < (IEEE80211_MIN_ACTION_SIZE +
3055 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3056 break;
3057
3058 if (!ieee80211_vif_is_mesh(&sdata->vif))
3059 break;
3060 if (mesh_action_is_path_sel(mgmt) &&
3061 !mesh_path_sel_is_hwmp(sdata))
3062 break;
3063 goto queue;
3064 }
3065
3066 return RX_CONTINUE;
3067
3068 invalid:
3069 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
3070 /* will return in the next handlers */
3071 return RX_CONTINUE;
3072
3073 handled:
3074 if (rx->sta)
3075 rx->sta->rx_stats.packets++;
3076 dev_kfree_skb(rx->skb);
3077 return RX_QUEUED;
3078
3079 queue:
3080 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3081 skb_queue_tail(&sdata->skb_queue, rx->skb);
3082 ieee80211_queue_work(&local->hw, &sdata->work);
3083 if (rx->sta)
3084 rx->sta->rx_stats.packets++;
3085 return RX_QUEUED;
3086}
3087
3088static ieee80211_rx_result debug_noinline
3089ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3090{
3091 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3092 int sig = 0;
3093
3094 /* skip known-bad action frames and return them in the next handler */
3095 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
3096 return RX_CONTINUE;
3097
3098 /*
3099 * Getting here means the kernel doesn't know how to handle
3100 * it, but maybe userspace does ... include returned frames
3101 * so userspace can register for those to know whether ones
3102 * it transmitted were processed or returned.
3103 */
3104
3105 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
3106 sig = status->signal;
3107
3108 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
3109 rx->skb->data, rx->skb->len, 0)) {
3110 if (rx->sta)
3111 rx->sta->rx_stats.packets++;
3112 dev_kfree_skb(rx->skb);
3113 return RX_QUEUED;
3114 }
3115
3116 return RX_CONTINUE;
3117}
3118
3119static ieee80211_rx_result debug_noinline
3120ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3121{
3122 struct ieee80211_local *local = rx->local;
3123 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3124 struct sk_buff *nskb;
3125 struct ieee80211_sub_if_data *sdata = rx->sdata;
3126 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
3127
3128 if (!ieee80211_is_action(mgmt->frame_control))
3129 return RX_CONTINUE;
3130
3131 /*
3132 * For AP mode, hostapd is responsible for handling any action
3133 * frames that we didn't handle, including returning unknown
3134 * ones. For all other modes we will return them to the sender,
3135 * setting the 0x80 bit in the action category, as required by
3136 * 802.11-2012 9.24.4.
3137 * Newer versions of hostapd shall also use the management frame
3138 * registration mechanisms, but older ones still use cooked
3139 * monitor interfaces so push all frames there.
3140 */
3141 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
3142 (sdata->vif.type == NL80211_IFTYPE_AP ||
3143 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3144 return RX_DROP_MONITOR;
3145
3146 if (is_multicast_ether_addr(mgmt->da))
3147 return RX_DROP_MONITOR;
3148
3149 /* do not return rejected action frames */
3150 if (mgmt->u.action.category & 0x80)
3151 return RX_DROP_UNUSABLE;
3152
3153 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3154 GFP_ATOMIC);
3155 if (nskb) {
3156 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3157
3158 nmgmt->u.action.category |= 0x80;
3159 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3160 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3161
3162 memset(nskb->cb, 0, sizeof(nskb->cb));
3163
3164 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3166
3167 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3168 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3169 IEEE80211_TX_CTL_NO_CCK_RATE;
3170 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3171 info->hw_queue =
3172 local->hw.offchannel_tx_hw_queue;
3173 }
3174
3175 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3176 status->band);
3177 }
3178 dev_kfree_skb(rx->skb);
3179 return RX_QUEUED;
3180}
3181
3182static ieee80211_rx_result debug_noinline
3183ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3184{
3185 struct ieee80211_sub_if_data *sdata = rx->sdata;
3186 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3187 __le16 stype;
3188
3189 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3190
3191 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3192 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3193 sdata->vif.type != NL80211_IFTYPE_OCB &&
3194 sdata->vif.type != NL80211_IFTYPE_STATION)
3195 return RX_DROP_MONITOR;
3196
3197 switch (stype) {
3198 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3199 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3200 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3201 /* process for all: mesh, mlme, ibss */
3202 break;
3203 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3204 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3205 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3206 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3207 if (is_multicast_ether_addr(mgmt->da) &&
3208 !is_broadcast_ether_addr(mgmt->da))
3209 return RX_DROP_MONITOR;
3210
3211 /* process only for station */
3212 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3213 return RX_DROP_MONITOR;
3214 break;
3215 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3216 /* process only for ibss and mesh */
3217 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3218 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3219 return RX_DROP_MONITOR;
3220 break;
3221 default:
3222 return RX_DROP_MONITOR;
3223 }
3224
3225 /* queue up frame and kick off work to process it */
3226 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3227 skb_queue_tail(&sdata->skb_queue, rx->skb);
3228 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3229 if (rx->sta)
3230 rx->sta->rx_stats.packets++;
3231
3232 return RX_QUEUED;
3233}
3234
3235static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3236 struct ieee80211_rate *rate)
3237{
3238 struct ieee80211_sub_if_data *sdata;
3239 struct ieee80211_local *local = rx->local;
3240 struct sk_buff *skb = rx->skb, *skb2;
3241 struct net_device *prev_dev = NULL;
3242 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3243 int needed_headroom;
3244
3245 /*
3246 * If cooked monitor has been processed already, then
3247 * don't do it again. If not, set the flag.
3248 */
3249 if (rx->flags & IEEE80211_RX_CMNTR)
3250 goto out_free_skb;
3251 rx->flags |= IEEE80211_RX_CMNTR;
3252
3253 /* If there are no cooked monitor interfaces, just free the SKB */
3254 if (!local->cooked_mntrs)
3255 goto out_free_skb;
3256
3257 /* vendor data is long removed here */
3258 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3259 /* room for the radiotap header based on driver features */
3260 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3261
3262 if (skb_headroom(skb) < needed_headroom &&
3263 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3264 goto out_free_skb;
3265
3266 /* prepend radiotap information */
3267 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3268 false);
3269
3270 skb_reset_mac_header(skb);
3271 skb->ip_summed = CHECKSUM_UNNECESSARY;
3272 skb->pkt_type = PACKET_OTHERHOST;
3273 skb->protocol = htons(ETH_P_802_2);
3274
3275 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3276 if (!ieee80211_sdata_running(sdata))
3277 continue;
3278
3279 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3280 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3281 continue;
3282
3283 if (prev_dev) {
3284 skb2 = skb_clone(skb, GFP_ATOMIC);
3285 if (skb2) {
3286 skb2->dev = prev_dev;
3287 netif_receive_skb(skb2);
3288 }
3289 }
3290
3291 prev_dev = sdata->dev;
3292 ieee80211_rx_stats(sdata->dev, skb->len);
3293 }
3294
3295 if (prev_dev) {
3296 skb->dev = prev_dev;
3297 netif_receive_skb(skb);
3298 return;
3299 }
3300
3301 out_free_skb:
3302 dev_kfree_skb(skb);
3303}
3304
3305static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3306 ieee80211_rx_result res)
3307{
3308 switch (res) {
3309 case RX_DROP_MONITOR:
3310 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3311 if (rx->sta)
3312 rx->sta->rx_stats.dropped++;
3313 /* fall through */
3314 case RX_CONTINUE: {
3315 struct ieee80211_rate *rate = NULL;
3316 struct ieee80211_supported_band *sband;
3317 struct ieee80211_rx_status *status;
3318
3319 status = IEEE80211_SKB_RXCB((rx->skb));
3320
3321 sband = rx->local->hw.wiphy->bands[status->band];
3322 if (!(status->flag & RX_FLAG_HT) &&
3323 !(status->flag & RX_FLAG_VHT))
3324 rate = &sband->bitrates[status->rate_idx];
3325
3326 ieee80211_rx_cooked_monitor(rx, rate);
3327 break;
3328 }
3329 case RX_DROP_UNUSABLE:
3330 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3331 if (rx->sta)
3332 rx->sta->rx_stats.dropped++;
3333 dev_kfree_skb(rx->skb);
3334 break;
3335 case RX_QUEUED:
3336 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3337 break;
3338 }
3339}
3340
3341static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3342 struct sk_buff_head *frames)
3343{
3344 ieee80211_rx_result res = RX_DROP_MONITOR;
3345 struct sk_buff *skb;
3346
3347#define CALL_RXH(rxh) \
3348 do { \
3349 res = rxh(rx); \
3350 if (res != RX_CONTINUE) \
3351 goto rxh_next; \
3352 } while (0)
3353
3354 /* Lock here to avoid hitting all of the data used in the RX
3355 * path (e.g. key data, station data, ...) concurrently when
3356 * a frame is released from the reorder buffer due to timeout
3357 * from the timer, potentially concurrently with RX from the
3358 * driver.
3359 */
3360 spin_lock_bh(&rx->local->rx_path_lock);
3361
3362 while ((skb = __skb_dequeue(frames))) {
3363 /*
3364 * all the other fields are valid across frames
3365 * that belong to an aMPDU since they are on the
3366 * same TID from the same station
3367 */
3368 rx->skb = skb;
3369
3370 CALL_RXH(ieee80211_rx_h_check_more_data);
3371 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3372 CALL_RXH(ieee80211_rx_h_sta_process);
3373 CALL_RXH(ieee80211_rx_h_decrypt);
3374 CALL_RXH(ieee80211_rx_h_defragment);
3375 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
3376 /* must be after MMIC verify so header is counted in MPDU mic */
3377#ifdef CONFIG_MAC80211_MESH
3378 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3379 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3380#endif
3381 CALL_RXH(ieee80211_rx_h_amsdu);
3382 CALL_RXH(ieee80211_rx_h_data);
3383
3384 /* special treatment -- needs the queue */
3385 res = ieee80211_rx_h_ctrl(rx, frames);
3386 if (res != RX_CONTINUE)
3387 goto rxh_next;
3388
3389 CALL_RXH(ieee80211_rx_h_mgmt_check);
3390 CALL_RXH(ieee80211_rx_h_action);
3391 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3392 CALL_RXH(ieee80211_rx_h_action_return);
3393 CALL_RXH(ieee80211_rx_h_mgmt);
3394
3395 rxh_next:
3396 ieee80211_rx_handlers_result(rx, res);
3397
3398#undef CALL_RXH
3399 }
3400
3401 spin_unlock_bh(&rx->local->rx_path_lock);
3402}
3403
3404static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3405{
3406 struct sk_buff_head reorder_release;
3407 ieee80211_rx_result res = RX_DROP_MONITOR;
3408
3409 __skb_queue_head_init(&reorder_release);
3410
3411#define CALL_RXH(rxh) \
3412 do { \
3413 res = rxh(rx); \
3414 if (res != RX_CONTINUE) \
3415 goto rxh_next; \
3416 } while (0)
3417
3418 CALL_RXH(ieee80211_rx_h_check_dup);
3419 CALL_RXH(ieee80211_rx_h_check);
3420
3421 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3422
3423 ieee80211_rx_handlers(rx, &reorder_release);
3424 return;
3425
3426 rxh_next:
3427 ieee80211_rx_handlers_result(rx, res);
3428
3429#undef CALL_RXH
3430}
3431
3432/*
3433 * This function makes calls into the RX path, therefore
3434 * it has to be invoked under RCU read lock.
3435 */
3436void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3437{
3438 struct sk_buff_head frames;
3439 struct ieee80211_rx_data rx = {
3440 .sta = sta,
3441 .sdata = sta->sdata,
3442 .local = sta->local,
3443 /* This is OK -- must be QoS data frame */
3444 .security_idx = tid,
3445 .seqno_idx = tid,
3446 .napi = NULL, /* must be NULL to not have races */
3447 };
3448 struct tid_ampdu_rx *tid_agg_rx;
3449
3450 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3451 if (!tid_agg_rx)
3452 return;
3453
3454 __skb_queue_head_init(&frames);
3455
3456 spin_lock(&tid_agg_rx->reorder_lock);
3457 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3458 spin_unlock(&tid_agg_rx->reorder_lock);
3459
3460 if (!skb_queue_empty(&frames)) {
3461 struct ieee80211_event event = {
3462 .type = BA_FRAME_TIMEOUT,
3463 .u.ba.tid = tid,
3464 .u.ba.sta = &sta->sta,
3465 };
3466 drv_event_callback(rx.local, rx.sdata, &event);
3467 }
3468
3469 ieee80211_rx_handlers(&rx, &frames);
3470}
3471
3472void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3473 u16 ssn, u64 filtered,
3474 u16 received_mpdus)
3475{
3476 struct sta_info *sta;
3477 struct tid_ampdu_rx *tid_agg_rx;
3478 struct sk_buff_head frames;
3479 struct ieee80211_rx_data rx = {
3480 /* This is OK -- must be QoS data frame */
3481 .security_idx = tid,
3482 .seqno_idx = tid,
3483 };
3484 int i, diff;
3485
3486 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3487 return;
3488
3489 __skb_queue_head_init(&frames);
3490
3491 sta = container_of(pubsta, struct sta_info, sta);
3492
3493 rx.sta = sta;
3494 rx.sdata = sta->sdata;
3495 rx.local = sta->local;
3496
3497 rcu_read_lock();
3498 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3499 if (!tid_agg_rx)
3500 goto out;
3501
3502 spin_lock_bh(&tid_agg_rx->reorder_lock);
3503
3504 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3505 int release;
3506
3507 /* release all frames in the reorder buffer */
3508 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3509 IEEE80211_SN_MODULO;
3510 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3511 release, &frames);
3512 /* update ssn to match received ssn */
3513 tid_agg_rx->head_seq_num = ssn;
3514 } else {
3515 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3516 &frames);
3517 }
3518
3519 /* handle the case that received ssn is behind the mac ssn.
3520 * it can be tid_agg_rx->buf_size behind and still be valid */
3521 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3522 if (diff >= tid_agg_rx->buf_size) {
3523 tid_agg_rx->reorder_buf_filtered = 0;
3524 goto release;
3525 }
3526 filtered = filtered >> diff;
3527 ssn += diff;
3528
3529 /* update bitmap */
3530 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3531 int index = (ssn + i) % tid_agg_rx->buf_size;
3532
3533 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3534 if (filtered & BIT_ULL(i))
3535 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3536 }
3537
3538 /* now process also frames that the filter marking released */
3539 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3540
3541release:
3542 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3543
3544 ieee80211_rx_handlers(&rx, &frames);
3545
3546 out:
3547 rcu_read_unlock();
3548}
3549EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3550
3551/* main receive path */
3552
3553static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3554{
3555 struct ieee80211_sub_if_data *sdata = rx->sdata;
3556 struct sk_buff *skb = rx->skb;
3557 struct ieee80211_hdr *hdr = (void *)skb->data;
3558 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3559 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3560 int multicast = is_multicast_ether_addr(hdr->addr1);
3561
3562 switch (sdata->vif.type) {
3563 case NL80211_IFTYPE_STATION:
3564 if (!bssid && !sdata->u.mgd.use_4addr)
3565 return false;
3566 if (multicast)
3567 return true;
3568 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3569 case NL80211_IFTYPE_ADHOC:
3570 if (!bssid)
3571 return false;
3572 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3573 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3574 return false;
3575 if (ieee80211_is_beacon(hdr->frame_control))
3576 return true;
3577 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3578 return false;
3579 if (!multicast &&
3580 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3581 return false;
3582 if (!rx->sta) {
3583 int rate_idx;
3584 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3585 rate_idx = 0; /* TODO: HT/VHT rates */
3586 else
3587 rate_idx = status->rate_idx;
3588 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3589 BIT(rate_idx));
3590 }
3591 return true;
3592 case NL80211_IFTYPE_OCB:
3593 if (!bssid)
3594 return false;
3595 if (!ieee80211_is_data_present(hdr->frame_control))
3596 return false;
3597 if (!is_broadcast_ether_addr(bssid))
3598 return false;
3599 if (!multicast &&
3600 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3601 return false;
3602 if (!rx->sta) {
3603 int rate_idx;
3604 if (status->flag & RX_FLAG_HT)
3605 rate_idx = 0; /* TODO: HT rates */
3606 else
3607 rate_idx = status->rate_idx;
3608 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3609 BIT(rate_idx));
3610 }
3611 return true;
3612 case NL80211_IFTYPE_MESH_POINT:
3613 if (multicast)
3614 return true;
3615 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3616 case NL80211_IFTYPE_AP_VLAN:
3617 case NL80211_IFTYPE_AP:
3618 if (!bssid)
3619 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3620
3621 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3622 /*
3623 * Accept public action frames even when the
3624 * BSSID doesn't match, this is used for P2P
3625 * and location updates. Note that mac80211
3626 * itself never looks at these frames.
3627 */
3628 if (!multicast &&
3629 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3630 return false;
3631 if (ieee80211_is_public_action(hdr, skb->len))
3632 return true;
3633 return ieee80211_is_beacon(hdr->frame_control);
3634 }
3635
3636 if (!ieee80211_has_tods(hdr->frame_control)) {
3637 /* ignore data frames to TDLS-peers */
3638 if (ieee80211_is_data(hdr->frame_control))
3639 return false;
3640 /* ignore action frames to TDLS-peers */
3641 if (ieee80211_is_action(hdr->frame_control) &&
3642 !is_broadcast_ether_addr(bssid) &&
3643 !ether_addr_equal(bssid, hdr->addr1))
3644 return false;
3645 }
3646
3647 /*
3648 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3649 * the BSSID - we've checked that already but may have accepted
3650 * the wildcard (ff:ff:ff:ff:ff:ff).
3651 *
3652 * It also says:
3653 * The BSSID of the Data frame is determined as follows:
3654 * a) If the STA is contained within an AP or is associated
3655 * with an AP, the BSSID is the address currently in use
3656 * by the STA contained in the AP.
3657 *
3658 * So we should not accept data frames with an address that's
3659 * multicast.
3660 *
3661 * Accepting it also opens a security problem because stations
3662 * could encrypt it with the GTK and inject traffic that way.
3663 */
3664 if (ieee80211_is_data(hdr->frame_control) && multicast)
3665 return false;
3666
3667 return true;
3668 case NL80211_IFTYPE_WDS:
3669 if (bssid || !ieee80211_is_data(hdr->frame_control))
3670 return false;
3671 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3672 case NL80211_IFTYPE_P2P_DEVICE:
3673 return ieee80211_is_public_action(hdr, skb->len) ||
3674 ieee80211_is_probe_req(hdr->frame_control) ||
3675 ieee80211_is_probe_resp(hdr->frame_control) ||
3676 ieee80211_is_beacon(hdr->frame_control);
3677 case NL80211_IFTYPE_NAN:
3678 /* Currently no frames on NAN interface are allowed */
3679 return false;
3680 default:
3681 break;
3682 }
3683
3684 WARN_ON_ONCE(1);
3685 return false;
3686}
3687
3688void ieee80211_check_fast_rx(struct sta_info *sta)
3689{
3690 struct ieee80211_sub_if_data *sdata = sta->sdata;
3691 struct ieee80211_local *local = sdata->local;
3692 struct ieee80211_key *key;
3693 struct ieee80211_fast_rx fastrx = {
3694 .dev = sdata->dev,
3695 .vif_type = sdata->vif.type,
3696 .control_port_protocol = sdata->control_port_protocol,
3697 }, *old, *new = NULL;
3698 bool assign = false;
3699
3700 /* use sparse to check that we don't return without updating */
3701 __acquire(check_fast_rx);
3702
3703 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3704 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3705 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3706 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3707
3708 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3709
3710 /* fast-rx doesn't do reordering */
3711 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3712 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3713 goto clear;
3714
3715 switch (sdata->vif.type) {
3716 case NL80211_IFTYPE_STATION:
3717 /* 4-addr is harder to deal with, later maybe */
3718 if (sdata->u.mgd.use_4addr)
3719 goto clear;
3720 /* software powersave is a huge mess, avoid all of it */
3721 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3722 goto clear;
3723 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3724 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3725 goto clear;
3726 if (sta->sta.tdls) {
3727 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3728 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3729 fastrx.expected_ds_bits = 0;
3730 } else {
3731 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3732 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3733 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3734 fastrx.expected_ds_bits =
3735 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3736 }
3737 break;
3738 case NL80211_IFTYPE_AP_VLAN:
3739 case NL80211_IFTYPE_AP:
3740 /* parallel-rx requires this, at least with calls to
3741 * ieee80211_sta_ps_transition()
3742 */
3743 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3744 goto clear;
3745 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3746 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3747 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3748
3749 fastrx.internal_forward =
3750 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3751 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3752 !sdata->u.vlan.sta);
3753 break;
3754 default:
3755 goto clear;
3756 }
3757
3758 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3759 goto clear;
3760
3761 rcu_read_lock();
3762 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3763 if (key) {
3764 switch (key->conf.cipher) {
3765 case WLAN_CIPHER_SUITE_TKIP:
3766 /* we don't want to deal with MMIC in fast-rx */
3767 goto clear_rcu;
3768 case WLAN_CIPHER_SUITE_CCMP:
3769 case WLAN_CIPHER_SUITE_CCMP_256:
3770 case WLAN_CIPHER_SUITE_GCMP:
3771 case WLAN_CIPHER_SUITE_GCMP_256:
3772 break;
3773 default:
3774 /* we also don't want to deal with WEP or cipher scheme
3775 * since those require looking up the key idx in the
3776 * frame, rather than assuming the PTK is used
3777 * (we need to revisit this once we implement the real
3778 * PTK index, which is now valid in the spec, but we
3779 * haven't implemented that part yet)
3780 */
3781 goto clear_rcu;
3782 }
3783
3784 fastrx.key = true;
3785 fastrx.icv_len = key->conf.icv_len;
3786 }
3787
3788 assign = true;
3789 clear_rcu:
3790 rcu_read_unlock();
3791 clear:
3792 __release(check_fast_rx);
3793
3794 if (assign)
3795 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3796
3797 spin_lock_bh(&sta->lock);
3798 old = rcu_dereference_protected(sta->fast_rx, true);
3799 rcu_assign_pointer(sta->fast_rx, new);
3800 spin_unlock_bh(&sta->lock);
3801
3802 if (old)
3803 kfree_rcu(old, rcu_head);
3804}
3805
3806void ieee80211_clear_fast_rx(struct sta_info *sta)
3807{
3808 struct ieee80211_fast_rx *old;
3809
3810 spin_lock_bh(&sta->lock);
3811 old = rcu_dereference_protected(sta->fast_rx, true);
3812 RCU_INIT_POINTER(sta->fast_rx, NULL);
3813 spin_unlock_bh(&sta->lock);
3814
3815 if (old)
3816 kfree_rcu(old, rcu_head);
3817}
3818
3819void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3820{
3821 struct ieee80211_local *local = sdata->local;
3822 struct sta_info *sta;
3823
3824 lockdep_assert_held(&local->sta_mtx);
3825
3826 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3827 if (sdata != sta->sdata &&
3828 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3829 continue;
3830 ieee80211_check_fast_rx(sta);
3831 }
3832}
3833
3834void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3835{
3836 struct ieee80211_local *local = sdata->local;
3837
3838 mutex_lock(&local->sta_mtx);
3839 __ieee80211_check_fast_rx_iface(sdata);
3840 mutex_unlock(&local->sta_mtx);
3841}
3842
3843static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3844 struct ieee80211_fast_rx *fast_rx)
3845{
3846 struct sk_buff *skb = rx->skb;
3847 struct ieee80211_hdr *hdr = (void *)skb->data;
3848 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3849 struct sta_info *sta = rx->sta;
3850 int orig_len = skb->len;
3851 int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3852 struct {
3853 u8 snap[sizeof(rfc1042_header)];
3854 __be16 proto;
3855 } *payload __aligned(2);
3856 struct {
3857 u8 da[ETH_ALEN];
3858 u8 sa[ETH_ALEN];
3859 } addrs __aligned(2);
3860 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3861
3862 if (fast_rx->uses_rss)
3863 stats = this_cpu_ptr(sta->pcpu_rx_stats);
3864
3865 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3866 * to a common data structure; drivers can implement that per queue
3867 * but we don't have that information in mac80211
3868 */
3869 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3870 return false;
3871
3872#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3873
3874 /* If using encryption, we also need to have:
3875 * - PN_VALIDATED: similar, but the implementation is tricky
3876 * - DECRYPTED: necessary for PN_VALIDATED
3877 */
3878 if (fast_rx->key &&
3879 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3880 return false;
3881
3882 /* we don't deal with A-MSDU deaggregation here */
3883 if (status->rx_flags & IEEE80211_RX_AMSDU)
3884 return false;
3885
3886 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3887 return false;
3888
3889 if (unlikely(ieee80211_is_frag(hdr)))
3890 return false;
3891
3892 /* Since our interface address cannot be multicast, this
3893 * implicitly also rejects multicast frames without the
3894 * explicit check.
3895 *
3896 * We shouldn't get any *data* frames not addressed to us
3897 * (AP mode will accept multicast *management* frames), but
3898 * punting here will make it go through the full checks in
3899 * ieee80211_accept_frame().
3900 */
3901 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3902 return false;
3903
3904 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3905 IEEE80211_FCTL_TODS)) !=
3906 fast_rx->expected_ds_bits)
3907 goto drop;
3908
3909 /* assign the key to drop unencrypted frames (later)
3910 * and strip the IV/MIC if necessary
3911 */
3912 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3913 /* GCMP header length is the same */
3914 snap_offs += IEEE80211_CCMP_HDR_LEN;
3915 }
3916
3917 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3918 goto drop;
3919 payload = (void *)(skb->data + snap_offs);
3920
3921 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3922 return false;
3923
3924 /* Don't handle these here since they require special code.
3925 * Accept AARP and IPX even though they should come with a
3926 * bridge-tunnel header - but if we get them this way then
3927 * there's little point in discarding them.
3928 */
3929 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3930 payload->proto == fast_rx->control_port_protocol))
3931 return false;
3932
3933 /* after this point, don't punt to the slowpath! */
3934
3935 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3936 pskb_trim(skb, skb->len - fast_rx->icv_len))
3937 goto drop;
3938
3939 if (unlikely(fast_rx->sta_notify)) {
3940 ieee80211_sta_rx_notify(rx->sdata, hdr);
3941 fast_rx->sta_notify = false;
3942 }
3943
3944 /* statistics part of ieee80211_rx_h_sta_process() */
3945 stats->last_rx = jiffies;
3946 stats->last_rate = sta_stats_encode_rate(status);
3947
3948 stats->fragments++;
3949
3950 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
3951 stats->last_signal = status->signal;
3952 if (!fast_rx->uses_rss)
3953 ewma_signal_add(&sta->rx_stats_avg.signal,
3954 -status->signal);
3955 }
3956
3957 if (status->chains) {
3958 int i;
3959
3960 stats->chains = status->chains;
3961 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3962 int signal = status->chain_signal[i];
3963
3964 if (!(status->chains & BIT(i)))
3965 continue;
3966
3967 stats->chain_signal_last[i] = signal;
3968 if (!fast_rx->uses_rss)
3969 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3970 -signal);
3971 }
3972 }
3973 /* end of statistics */
3974
3975 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3976 goto drop;
3977
3978 /* do the header conversion - first grab the addresses */
3979 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3980 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3981 /* remove the SNAP but leave the ethertype */
3982 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3983 /* push the addresses in front */
3984 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3985
3986 skb->dev = fast_rx->dev;
3987
3988 ieee80211_rx_stats(fast_rx->dev, skb->len);
3989
3990 /* The seqno index has the same property as needed
3991 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3992 * for non-QoS-data frames. Here we know it's a data
3993 * frame, so count MSDUs.
3994 */
3995 u64_stats_update_begin(&stats->syncp);
3996 stats->msdu[rx->seqno_idx]++;
3997 stats->bytes += orig_len;
3998 u64_stats_update_end(&stats->syncp);
3999
4000 if (fast_rx->internal_forward) {
4001 struct sk_buff *xmit_skb = NULL;
4002 bool multicast = is_multicast_ether_addr(skb->data);
4003
4004 if (multicast) {
4005 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4006 } else if (sta_info_get(rx->sdata, skb->data)) {
4007 xmit_skb = skb;
4008 skb = NULL;
4009 }
4010
4011 if (xmit_skb) {
4012 /*
4013 * Send to wireless media and increase priority by 256
4014 * to keep the received priority instead of
4015 * reclassifying the frame (see cfg80211_classify8021d).
4016 */
4017 xmit_skb->priority += 256;
4018 xmit_skb->protocol = htons(ETH_P_802_3);
4019 skb_reset_network_header(xmit_skb);
4020 skb_reset_mac_header(xmit_skb);
4021 dev_queue_xmit(xmit_skb);
4022 }
4023
4024 if (!skb)
4025 return true;
4026 }
4027
4028 /* deliver to local stack */
4029 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4030 memset(skb->cb, 0, sizeof(skb->cb));
4031 if (rx->napi)
4032 napi_gro_receive(rx->napi, skb);
4033 else
4034 netif_receive_skb(skb);
4035
4036 return true;
4037 drop:
4038 dev_kfree_skb(skb);
4039 stats->dropped++;
4040 return true;
4041}
4042
4043/*
4044 * This function returns whether or not the SKB
4045 * was destined for RX processing or not, which,
4046 * if consume is true, is equivalent to whether
4047 * or not the skb was consumed.
4048 */
4049static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4050 struct sk_buff *skb, bool consume)
4051{
4052 struct ieee80211_local *local = rx->local;
4053 struct ieee80211_sub_if_data *sdata = rx->sdata;
4054
4055 rx->skb = skb;
4056
4057 /* See if we can do fast-rx; if we have to copy we already lost,
4058 * so punt in that case. We should never have to deliver a data
4059 * frame to multiple interfaces anyway.
4060 *
4061 * We skip the ieee80211_accept_frame() call and do the necessary
4062 * checking inside ieee80211_invoke_fast_rx().
4063 */
4064 if (consume && rx->sta) {
4065 struct ieee80211_fast_rx *fast_rx;
4066
4067 fast_rx = rcu_dereference(rx->sta->fast_rx);
4068 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4069 return true;
4070 }
4071
4072 if (!ieee80211_accept_frame(rx))
4073 return false;
4074
4075 if (!consume) {
4076 skb = skb_copy(skb, GFP_ATOMIC);
4077 if (!skb) {
4078 if (net_ratelimit())
4079 wiphy_debug(local->hw.wiphy,
4080 "failed to copy skb for %s\n",
4081 sdata->name);
4082 return true;
4083 }
4084
4085 rx->skb = skb;
4086 }
4087
4088 ieee80211_invoke_rx_handlers(rx);
4089 return true;
4090}
4091
4092/*
4093 * This is the actual Rx frames handler. as it belongs to Rx path it must
4094 * be called with rcu_read_lock protection.
4095 */
4096static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
4097 struct ieee80211_sta *pubsta,
4098 struct sk_buff *skb,
4099 struct napi_struct *napi)
4100{
4101 struct ieee80211_local *local = hw_to_local(hw);
4102 struct ieee80211_sub_if_data *sdata;
4103 struct ieee80211_hdr *hdr;
4104 __le16 fc;
4105 struct ieee80211_rx_data rx;
4106 struct ieee80211_sub_if_data *prev;
4107 struct rhlist_head *tmp;
4108 int err = 0;
4109
4110 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
4111 memset(&rx, 0, sizeof(rx));
4112 rx.skb = skb;
4113 rx.local = local;
4114 rx.napi = napi;
4115
4116 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
4117 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
4118
4119 if (ieee80211_is_mgmt(fc)) {
4120 /* drop frame if too short for header */
4121 if (skb->len < ieee80211_hdrlen(fc))
4122 err = -ENOBUFS;
4123 else
4124 err = skb_linearize(skb);
4125 } else {
4126 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4127 }
4128
4129 if (err) {
4130 dev_kfree_skb(skb);
4131 return;
4132 }
4133
4134 hdr = (struct ieee80211_hdr *)skb->data;
4135 ieee80211_parse_qos(&rx);
4136 ieee80211_verify_alignment(&rx);
4137
4138 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4139 ieee80211_is_beacon(hdr->frame_control)))
4140 ieee80211_scan_rx(local, skb);
4141
4142 if (ieee80211_is_data(fc)) {
4143 struct sta_info *sta, *prev_sta;
4144
4145 if (pubsta) {
4146 rx.sta = container_of(pubsta, struct sta_info, sta);
4147 rx.sdata = rx.sta->sdata;
4148 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4149 return;
4150 goto out;
4151 }
4152
4153 prev_sta = NULL;
4154
4155 for_each_sta_info(local, hdr->addr2, sta, tmp) {
4156 if (!prev_sta) {
4157 prev_sta = sta;
4158 continue;
4159 }
4160
4161 rx.sta = prev_sta;
4162 rx.sdata = prev_sta->sdata;
4163 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4164
4165 prev_sta = sta;
4166 }
4167
4168 if (prev_sta) {
4169 rx.sta = prev_sta;
4170 rx.sdata = prev_sta->sdata;
4171
4172 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4173 return;
4174 goto out;
4175 }
4176 }
4177
4178 prev = NULL;
4179
4180 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4181 if (!ieee80211_sdata_running(sdata))
4182 continue;
4183
4184 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4185 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4186 continue;
4187
4188 /*
4189 * frame is destined for this interface, but if it's
4190 * not also for the previous one we handle that after
4191 * the loop to avoid copying the SKB once too much
4192 */
4193
4194 if (!prev) {
4195 prev = sdata;
4196 continue;
4197 }
4198
4199 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4200 rx.sdata = prev;
4201 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4202
4203 prev = sdata;
4204 }
4205
4206 if (prev) {
4207 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4208 rx.sdata = prev;
4209
4210 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4211 return;
4212 }
4213
4214 out:
4215 dev_kfree_skb(skb);
4216}
4217
4218/*
4219 * This is the receive path handler. It is called by a low level driver when an
4220 * 802.11 MPDU is received from the hardware.
4221 */
4222void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4223 struct sk_buff *skb, struct napi_struct *napi)
4224{
4225 struct ieee80211_local *local = hw_to_local(hw);
4226 struct ieee80211_rate *rate = NULL;
4227 struct ieee80211_supported_band *sband;
4228 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4229
4230 WARN_ON_ONCE(softirq_count() == 0);
4231
4232 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
4233 goto drop;
4234
4235 sband = local->hw.wiphy->bands[status->band];
4236 if (WARN_ON(!sband))
4237 goto drop;
4238
4239 /*
4240 * If we're suspending, it is possible although not too likely
4241 * that we'd be receiving frames after having already partially
4242 * quiesced the stack. We can't process such frames then since
4243 * that might, for example, cause stations to be added or other
4244 * driver callbacks be invoked.
4245 */
4246 if (unlikely(local->quiescing || local->suspended))
4247 goto drop;
4248
4249 /* We might be during a HW reconfig, prevent Rx for the same reason */
4250 if (unlikely(local->in_reconfig))
4251 goto drop;
4252
4253 /*
4254 * The same happens when we're not even started,
4255 * but that's worth a warning.
4256 */
4257 if (WARN_ON(!local->started))
4258 goto drop;
4259
4260 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
4261 /*
4262 * Validate the rate, unless a PLCP error means that
4263 * we probably can't have a valid rate here anyway.
4264 */
4265
4266 if (status->flag & RX_FLAG_HT) {
4267 /*
4268 * rate_idx is MCS index, which can be [0-76]
4269 * as documented on:
4270 *
4271 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4272 *
4273 * Anything else would be some sort of driver or
4274 * hardware error. The driver should catch hardware
4275 * errors.
4276 */
4277 if (WARN(status->rate_idx > 76,
4278 "Rate marked as an HT rate but passed "
4279 "status->rate_idx is not "
4280 "an MCS index [0-76]: %d (0x%02x)\n",
4281 status->rate_idx,
4282 status->rate_idx))
4283 goto drop;
4284 } else if (status->flag & RX_FLAG_VHT) {
4285 if (WARN_ONCE(status->rate_idx > 9 ||
4286 !status->vht_nss ||
4287 status->vht_nss > 8,
4288 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4289 status->rate_idx, status->vht_nss))
4290 goto drop;
4291 } else {
4292 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
4293 goto drop;
4294 rate = &sband->bitrates[status->rate_idx];
4295 }
4296 }
4297
4298 status->rx_flags = 0;
4299
4300 /*
4301 * key references and virtual interfaces are protected using RCU
4302 * and this requires that we are in a read-side RCU section during
4303 * receive processing
4304 */
4305 rcu_read_lock();
4306
4307 /*
4308 * Frames with failed FCS/PLCP checksum are not returned,
4309 * all other frames are returned without radiotap header
4310 * if it was previously present.
4311 * Also, frames with less than 16 bytes are dropped.
4312 */
4313 skb = ieee80211_rx_monitor(local, skb, rate);
4314 if (!skb) {
4315 rcu_read_unlock();
4316 return;
4317 }
4318
4319 ieee80211_tpt_led_trig_rx(local,
4320 ((struct ieee80211_hdr *)skb->data)->frame_control,
4321 skb->len);
4322
4323 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
4324
4325 rcu_read_unlock();
4326
4327 return;
4328 drop:
4329 kfree_skb(skb);
4330}
4331EXPORT_SYMBOL(ieee80211_rx_napi);
4332
4333/* This is a version of the rx handler that can be called from hard irq
4334 * context. Post the skb on the queue and schedule the tasklet */
4335void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
4336{
4337 struct ieee80211_local *local = hw_to_local(hw);
4338
4339 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4340
4341 skb->pkt_type = IEEE80211_RX_MSG;
4342 skb_queue_tail(&local->skb_queue, skb);
4343 tasklet_schedule(&local->tasklet);
4344}
4345EXPORT_SYMBOL(ieee80211_rx_irqsafe);
ubuntu-zesty-kernel mirror