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perf buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid
[linux-stable.git] / net / mac80211 / rx.c
blobdc27becb9b71ec6ab3c2f0b94b57c278296f8157
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 - 2016 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
37 static 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
47 static 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 */
98 static 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
118 static 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
142 static int
143 ieee80211_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 (status->chains) {
184 /* antenna and antenna signal fields */
185 len += 2 * hweight8(status->chains);
186 }
187
188 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
189 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
190
191 /* vendor presence bitmap */
192 len += 4;
193 /* alignment for fixed 6-byte vendor data header */
194 len = ALIGN(len, 2);
195 /* vendor data header */
196 len += 6;
197 if (WARN_ON(rtap->align == 0))
198 rtap->align = 1;
199 len = ALIGN(len, rtap->align);
200 len += rtap->len + rtap->pad;
201 }
202
203 return len;
204 }
205
206 /*
207 * ieee80211_add_rx_radiotap_header - add radiotap header
208 *
209 * add a radiotap header containing all the fields which the hardware provided.
210 */
211 static void
212 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
213 struct sk_buff *skb,
214 struct ieee80211_rate *rate,
215 int rtap_len, bool has_fcs)
216 {
217 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
218 struct ieee80211_radiotap_header *rthdr;
219 unsigned char *pos;
220 __le32 *it_present;
221 u32 it_present_val;
222 u16 rx_flags = 0;
223 u16 channel_flags = 0;
224 int mpdulen, chain;
225 unsigned long chains = status->chains;
226 struct ieee80211_vendor_radiotap rtap = {};
227
228 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
229 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
230 /* rtap.len and rtap.pad are undone immediately */
231 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
232 }
233
234 mpdulen = skb->len;
235 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
236 mpdulen += FCS_LEN;
237
238 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
239 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
240 it_present = &rthdr->it_present;
241
242 /* radiotap header, set always present flags */
243 rthdr->it_len = cpu_to_le16(rtap_len);
244 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
245 BIT(IEEE80211_RADIOTAP_CHANNEL) |
246 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
247
248 if (!status->chains)
249 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
250
251 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
252 it_present_val |=
253 BIT(IEEE80211_RADIOTAP_EXT) |
254 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
255 put_unaligned_le32(it_present_val, it_present);
256 it_present++;
257 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
258 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
259 }
260
261 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
262 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
263 BIT(IEEE80211_RADIOTAP_EXT);
264 put_unaligned_le32(it_present_val, it_present);
265 it_present++;
266 it_present_val = rtap.present;
267 }
268
269 put_unaligned_le32(it_present_val, it_present);
270
271 pos = (void *)(it_present + 1);
272
273 /* the order of the following fields is important */
274
275 /* IEEE80211_RADIOTAP_TSFT */
276 if (ieee80211_have_rx_timestamp(status)) {
277 /* padding */
278 while ((pos - (u8 *)rthdr) & 7)
279 *pos++ = 0;
280 put_unaligned_le64(
281 ieee80211_calculate_rx_timestamp(local, status,
282 mpdulen, 0),
283 pos);
284 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
285 pos += 8;
286 }
287
288 /* IEEE80211_RADIOTAP_FLAGS */
289 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
290 *pos |= IEEE80211_RADIOTAP_F_FCS;
291 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
292 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
293 if (status->flag & RX_FLAG_SHORTPRE)
294 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
295 pos++;
296
297 /* IEEE80211_RADIOTAP_RATE */
298 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
299 /*
300 * Without rate information don't add it. If we have,
301 * MCS information is a separate field in radiotap,
302 * added below. The byte here is needed as padding
303 * for the channel though, so initialise it to 0.
304 */
305 *pos = 0;
306 } else {
307 int shift = 0;
308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
309 if (status->flag & RX_FLAG_10MHZ)
310 shift = 1;
311 else if (status->flag & RX_FLAG_5MHZ)
312 shift = 2;
313 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
314 }
315 pos++;
316
317 /* IEEE80211_RADIOTAP_CHANNEL */
318 put_unaligned_le16(status->freq, pos);
319 pos += 2;
320 if (status->flag & RX_FLAG_10MHZ)
321 channel_flags |= IEEE80211_CHAN_HALF;
322 else if (status->flag & RX_FLAG_5MHZ)
323 channel_flags |= IEEE80211_CHAN_QUARTER;
324
325 if (status->band == IEEE80211_BAND_5GHZ)
326 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
327 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
328 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
329 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
330 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
331 else if (rate)
332 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
333 else
334 channel_flags |= IEEE80211_CHAN_2GHZ;
335 put_unaligned_le16(channel_flags, pos);
336 pos += 2;
337
338 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
339 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
340 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
341 *pos = status->signal;
342 rthdr->it_present |=
343 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
344 pos++;
345 }
346
347 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
348
349 if (!status->chains) {
350 /* IEEE80211_RADIOTAP_ANTENNA */
351 *pos = status->antenna;
352 pos++;
353 }
354
355 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
356
357 /* IEEE80211_RADIOTAP_RX_FLAGS */
358 /* ensure 2 byte alignment for the 2 byte field as required */
359 if ((pos - (u8 *)rthdr) & 1)
360 *pos++ = 0;
361 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
362 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
363 put_unaligned_le16(rx_flags, pos);
364 pos += 2;
365
366 if (status->flag & RX_FLAG_HT) {
367 unsigned int stbc;
368
369 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
370 *pos++ = local->hw.radiotap_mcs_details;
371 *pos = 0;
372 if (status->flag & RX_FLAG_SHORT_GI)
373 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
374 if (status->flag & RX_FLAG_40MHZ)
375 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
376 if (status->flag & RX_FLAG_HT_GF)
377 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
378 if (status->flag & RX_FLAG_LDPC)
379 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
380 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
381 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
382 pos++;
383 *pos++ = status->rate_idx;
384 }
385
386 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
387 u16 flags = 0;
388
389 /* ensure 4 byte alignment */
390 while ((pos - (u8 *)rthdr) & 3)
391 pos++;
392 rthdr->it_present |=
393 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
394 put_unaligned_le32(status->ampdu_reference, pos);
395 pos += 4;
396 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
397 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
398 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
399 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
400 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
401 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
402 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
403 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
404 put_unaligned_le16(flags, pos);
405 pos += 2;
406 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
407 *pos++ = status->ampdu_delimiter_crc;
408 else
409 *pos++ = 0;
410 *pos++ = 0;
411 }
412
413 if (status->flag & RX_FLAG_VHT) {
414 u16 known = local->hw.radiotap_vht_details;
415
416 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
417 put_unaligned_le16(known, pos);
418 pos += 2;
419 /* flags */
420 if (status->flag & RX_FLAG_SHORT_GI)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
422 /* in VHT, STBC is binary */
423 if (status->flag & RX_FLAG_STBC_MASK)
424 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
425 if (status->vht_flag & RX_VHT_FLAG_BF)
426 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
427 pos++;
428 /* bandwidth */
429 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
430 *pos++ = 4;
431 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
432 *pos++ = 11;
433 else if (status->flag & RX_FLAG_40MHZ)
434 *pos++ = 1;
435 else /* 20 MHz */
436 *pos++ = 0;
437 /* MCS/NSS */
438 *pos = (status->rate_idx << 4) | status->vht_nss;
439 pos += 4;
440 /* coding field */
441 if (status->flag & RX_FLAG_LDPC)
442 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
443 pos++;
444 /* group ID */
445 pos++;
446 /* partial_aid */
447 pos += 2;
448 }
449
450 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
451 *pos++ = status->chain_signal[chain];
452 *pos++ = chain;
453 }
454
455 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
456 /* ensure 2 byte alignment for the vendor field as required */
457 if ((pos - (u8 *)rthdr) & 1)
458 *pos++ = 0;
459 *pos++ = rtap.oui[0];
460 *pos++ = rtap.oui[1];
461 *pos++ = rtap.oui[2];
462 *pos++ = rtap.subns;
463 put_unaligned_le16(rtap.len, pos);
464 pos += 2;
465 /* align the actual payload as requested */
466 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
467 *pos++ = 0;
468 /* data (and possible padding) already follows */
469 }
470 }
471
472 /*
473 * This function copies a received frame to all monitor interfaces and
474 * returns a cleaned-up SKB that no longer includes the FCS nor the
475 * radiotap header the driver might have added.
476 */
477 static struct sk_buff *
478 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
479 struct ieee80211_rate *rate)
480 {
481 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
482 struct ieee80211_sub_if_data *sdata;
483 int rt_hdrlen, needed_headroom;
484 struct sk_buff *skb, *skb2;
485 struct net_device *prev_dev = NULL;
486 int present_fcs_len = 0;
487 unsigned int rtap_vendor_space = 0;
488
489 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
490 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
491
492 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
493 }
494
495 /*
496 * First, we may need to make a copy of the skb because
497 * (1) we need to modify it for radiotap (if not present), and
498 * (2) the other RX handlers will modify the skb we got.
499 *
500 * We don't need to, of course, if we aren't going to return
501 * the SKB because it has a bad FCS/PLCP checksum.
502 */
503
504 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
505 present_fcs_len = FCS_LEN;
506
507 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
508 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
509 dev_kfree_skb(origskb);
510 return NULL;
511 }
512
513 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
514 if (should_drop_frame(origskb, present_fcs_len,
515 rtap_vendor_space)) {
516 dev_kfree_skb(origskb);
517 return NULL;
518 }
519
520 return remove_monitor_info(local, origskb, rtap_vendor_space);
521 }
522
523 /* room for the radiotap header based on driver features */
524 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
525 needed_headroom = rt_hdrlen - rtap_vendor_space;
526
527 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
528 /* only need to expand headroom if necessary */
529 skb = origskb;
530 origskb = NULL;
531
532 /*
533 * This shouldn't trigger often because most devices have an
534 * RX header they pull before we get here, and that should
535 * be big enough for our radiotap information. We should
536 * probably export the length to drivers so that we can have
537 * them allocate enough headroom to start with.
538 */
539 if (skb_headroom(skb) < needed_headroom &&
540 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
541 dev_kfree_skb(skb);
542 return NULL;
543 }
544 } else {
545 /*
546 * Need to make a copy and possibly remove radiotap header
547 * and FCS from the original.
548 */
549 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
550
551 origskb = remove_monitor_info(local, origskb,
552 rtap_vendor_space);
553
554 if (!skb)
555 return origskb;
556 }
557
558 /* prepend radiotap information */
559 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
560
561 skb_reset_mac_header(skb);
562 skb->ip_summed = CHECKSUM_UNNECESSARY;
563 skb->pkt_type = PACKET_OTHERHOST;
564 skb->protocol = htons(ETH_P_802_2);
565
566 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
567 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
568 continue;
569
570 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
571 continue;
572
573 if (!ieee80211_sdata_running(sdata))
574 continue;
575
576 if (prev_dev) {
577 skb2 = skb_clone(skb, GFP_ATOMIC);
578 if (skb2) {
579 skb2->dev = prev_dev;
580 netif_receive_skb(skb2);
581 }
582 }
583
584 prev_dev = sdata->dev;
585 ieee80211_rx_stats(sdata->dev, skb->len);
586 }
587
588 if (prev_dev) {
589 skb->dev = prev_dev;
590 netif_receive_skb(skb);
591 } else
592 dev_kfree_skb(skb);
593
594 return origskb;
595 }
596
597 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
598 {
599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
600 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
601 int tid, seqno_idx, security_idx;
602
603 /* does the frame have a qos control field? */
604 if (ieee80211_is_data_qos(hdr->frame_control)) {
605 u8 *qc = ieee80211_get_qos_ctl(hdr);
606 /* frame has qos control */
607 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
608 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
609 status->rx_flags |= IEEE80211_RX_AMSDU;
610
611 seqno_idx = tid;
612 security_idx = tid;
613 } else {
614 /*
615 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
616 *
617 * Sequence numbers for management frames, QoS data
618 * frames with a broadcast/multicast address in the
619 * Address 1 field, and all non-QoS data frames sent
620 * by QoS STAs are assigned using an additional single
621 * modulo-4096 counter, [...]
622 *
623 * We also use that counter for non-QoS STAs.
624 */
625 seqno_idx = IEEE80211_NUM_TIDS;
626 security_idx = 0;
627 if (ieee80211_is_mgmt(hdr->frame_control))
628 security_idx = IEEE80211_NUM_TIDS;
629 tid = 0;
630 }
631
632 rx->seqno_idx = seqno_idx;
633 rx->security_idx = security_idx;
634 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
635 * For now, set skb->priority to 0 for other cases. */
636 rx->skb->priority = (tid > 7) ? 0 : tid;
637 }
638
639 /**
640 * DOC: Packet alignment
641 *
642 * Drivers always need to pass packets that are aligned to two-byte boundaries
643 * to the stack.
644 *
645 * Additionally, should, if possible, align the payload data in a way that
646 * guarantees that the contained IP header is aligned to a four-byte
647 * boundary. In the case of regular frames, this simply means aligning the
648 * payload to a four-byte boundary (because either the IP header is directly
649 * contained, or IV/RFC1042 headers that have a length divisible by four are
650 * in front of it). If the payload data is not properly aligned and the
651 * architecture doesn't support efficient unaligned operations, mac80211
652 * will align the data.
653 *
654 * With A-MSDU frames, however, the payload data address must yield two modulo
655 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
656 * push the IP header further back to a multiple of four again. Thankfully, the
657 * specs were sane enough this time around to require padding each A-MSDU
658 * subframe to a length that is a multiple of four.
659 *
660 * Padding like Atheros hardware adds which is between the 802.11 header and
661 * the payload is not supported, the driver is required to move the 802.11
662 * header to be directly in front of the payload in that case.
663 */
664 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
665 {
666 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
667 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
668 #endif
669 }
670
671
672 /* rx handlers */
673
674 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
675 {
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677
678 if (is_multicast_ether_addr(hdr->addr1))
679 return 0;
680
681 return ieee80211_is_robust_mgmt_frame(skb);
682 }
683
684
685 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
686 {
687 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
688
689 if (!is_multicast_ether_addr(hdr->addr1))
690 return 0;
691
692 return ieee80211_is_robust_mgmt_frame(skb);
693 }
694
695
696 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
697 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
698 {
699 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
700 struct ieee80211_mmie *mmie;
701 struct ieee80211_mmie_16 *mmie16;
702
703 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
704 return -1;
705
706 if (!ieee80211_is_robust_mgmt_frame(skb))
707 return -1; /* not a robust management frame */
708
709 mmie = (struct ieee80211_mmie *)
710 (skb->data + skb->len - sizeof(*mmie));
711 if (mmie->element_id == WLAN_EID_MMIE &&
712 mmie->length == sizeof(*mmie) - 2)
713 return le16_to_cpu(mmie->key_id);
714
715 mmie16 = (struct ieee80211_mmie_16 *)
716 (skb->data + skb->len - sizeof(*mmie16));
717 if (skb->len >= 24 + sizeof(*mmie16) &&
718 mmie16->element_id == WLAN_EID_MMIE &&
719 mmie16->length == sizeof(*mmie16) - 2)
720 return le16_to_cpu(mmie16->key_id);
721
722 return -1;
723 }
724
725 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
726 struct sk_buff *skb)
727 {
728 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
729 __le16 fc;
730 int hdrlen;
731 u8 keyid;
732
733 fc = hdr->frame_control;
734 hdrlen = ieee80211_hdrlen(fc);
735
736 if (skb->len < hdrlen + cs->hdr_len)
737 return -EINVAL;
738
739 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
740 keyid &= cs->key_idx_mask;
741 keyid >>= cs->key_idx_shift;
742
743 return keyid;
744 }
745
746 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
747 {
748 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
749 char *dev_addr = rx->sdata->vif.addr;
750
751 if (ieee80211_is_data(hdr->frame_control)) {
752 if (is_multicast_ether_addr(hdr->addr1)) {
753 if (ieee80211_has_tods(hdr->frame_control) ||
754 !ieee80211_has_fromds(hdr->frame_control))
755 return RX_DROP_MONITOR;
756 if (ether_addr_equal(hdr->addr3, dev_addr))
757 return RX_DROP_MONITOR;
758 } else {
759 if (!ieee80211_has_a4(hdr->frame_control))
760 return RX_DROP_MONITOR;
761 if (ether_addr_equal(hdr->addr4, dev_addr))
762 return RX_DROP_MONITOR;
763 }
764 }
765
766 /* If there is not an established peer link and this is not a peer link
767 * establisment frame, beacon or probe, drop the frame.
768 */
769
770 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
771 struct ieee80211_mgmt *mgmt;
772
773 if (!ieee80211_is_mgmt(hdr->frame_control))
774 return RX_DROP_MONITOR;
775
776 if (ieee80211_is_action(hdr->frame_control)) {
777 u8 category;
778
779 /* make sure category field is present */
780 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
781 return RX_DROP_MONITOR;
782
783 mgmt = (struct ieee80211_mgmt *)hdr;
784 category = mgmt->u.action.category;
785 if (category != WLAN_CATEGORY_MESH_ACTION &&
786 category != WLAN_CATEGORY_SELF_PROTECTED)
787 return RX_DROP_MONITOR;
788 return RX_CONTINUE;
789 }
790
791 if (ieee80211_is_probe_req(hdr->frame_control) ||
792 ieee80211_is_probe_resp(hdr->frame_control) ||
793 ieee80211_is_beacon(hdr->frame_control) ||
794 ieee80211_is_auth(hdr->frame_control))
795 return RX_CONTINUE;
796
797 return RX_DROP_MONITOR;
798 }
799
800 return RX_CONTINUE;
801 }
802
803 static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
804 int index)
805 {
806 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
807 struct sk_buff *tail = skb_peek_tail(frames);
808 struct ieee80211_rx_status *status;
809
810 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
811 return true;
812
813 if (!tail)
814 return false;
815
816 status = IEEE80211_SKB_RXCB(tail);
817 if (status->flag & RX_FLAG_AMSDU_MORE)
818 return false;
819
820 return true;
821 }
822
823 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
824 struct tid_ampdu_rx *tid_agg_rx,
825 int index,
826 struct sk_buff_head *frames)
827 {
828 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
829 struct sk_buff *skb;
830 struct ieee80211_rx_status *status;
831
832 lockdep_assert_held(&tid_agg_rx->reorder_lock);
833
834 if (skb_queue_empty(skb_list))
835 goto no_frame;
836
837 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
838 __skb_queue_purge(skb_list);
839 goto no_frame;
840 }
841
842 /* release frames from the reorder ring buffer */
843 tid_agg_rx->stored_mpdu_num--;
844 while ((skb = __skb_dequeue(skb_list))) {
845 status = IEEE80211_SKB_RXCB(skb);
846 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
847 __skb_queue_tail(frames, skb);
848 }
849
850 no_frame:
851 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
852 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
853 }
854
855 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
856 struct tid_ampdu_rx *tid_agg_rx,
857 u16 head_seq_num,
858 struct sk_buff_head *frames)
859 {
860 int index;
861
862 lockdep_assert_held(&tid_agg_rx->reorder_lock);
863
864 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
865 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
866 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
867 frames);
868 }
869 }
870
871 /*
872 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
873 * the skb was added to the buffer longer than this time ago, the earlier
874 * frames that have not yet been received are assumed to be lost and the skb
875 * can be released for processing. This may also release other skb's from the
876 * reorder buffer if there are no additional gaps between the frames.
877 *
878 * Callers must hold tid_agg_rx->reorder_lock.
879 */
880 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
881
882 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
883 struct tid_ampdu_rx *tid_agg_rx,
884 struct sk_buff_head *frames)
885 {
886 int index, i, j;
887
888 lockdep_assert_held(&tid_agg_rx->reorder_lock);
889
890 /* release the buffer until next missing frame */
891 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
892 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
893 tid_agg_rx->stored_mpdu_num) {
894 /*
895 * No buffers ready to be released, but check whether any
896 * frames in the reorder buffer have timed out.
897 */
898 int skipped = 1;
899 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
900 j = (j + 1) % tid_agg_rx->buf_size) {
901 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
902 skipped++;
903 continue;
904 }
905 if (skipped &&
906 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
907 HT_RX_REORDER_BUF_TIMEOUT))
908 goto set_release_timer;
909
910 /* don't leave incomplete A-MSDUs around */
911 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
912 i = (i + 1) % tid_agg_rx->buf_size)
913 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
914
915 ht_dbg_ratelimited(sdata,
916 "release an RX reorder frame due to timeout on earlier frames\n");
917 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
918 frames);
919
920 /*
921 * Increment the head seq# also for the skipped slots.
922 */
923 tid_agg_rx->head_seq_num =
924 (tid_agg_rx->head_seq_num +
925 skipped) & IEEE80211_SN_MASK;
926 skipped = 0;
927 }
928 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
929 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
930 frames);
931 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
932 }
933
934 if (tid_agg_rx->stored_mpdu_num) {
935 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
936
937 for (; j != (index - 1) % tid_agg_rx->buf_size;
938 j = (j + 1) % tid_agg_rx->buf_size) {
939 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
940 break;
941 }
942
943 set_release_timer:
944
945 if (!tid_agg_rx->removed)
946 mod_timer(&tid_agg_rx->reorder_timer,
947 tid_agg_rx->reorder_time[j] + 1 +
948 HT_RX_REORDER_BUF_TIMEOUT);
949 } else {
950 del_timer(&tid_agg_rx->reorder_timer);
951 }
952 }
953
954 /*
955 * As this function belongs to the RX path it must be under
956 * rcu_read_lock protection. It returns false if the frame
957 * can be processed immediately, true if it was consumed.
958 */
959 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
960 struct tid_ampdu_rx *tid_agg_rx,
961 struct sk_buff *skb,
962 struct sk_buff_head *frames)
963 {
964 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
965 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
966 u16 sc = le16_to_cpu(hdr->seq_ctrl);
967 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
968 u16 head_seq_num, buf_size;
969 int index;
970 bool ret = true;
971
972 spin_lock(&tid_agg_rx->reorder_lock);
973
974 /*
975 * Offloaded BA sessions have no known starting sequence number so pick
976 * one from first Rxed frame for this tid after BA was started.
977 */
978 if (unlikely(tid_agg_rx->auto_seq)) {
979 tid_agg_rx->auto_seq = false;
980 tid_agg_rx->ssn = mpdu_seq_num;
981 tid_agg_rx->head_seq_num = mpdu_seq_num;
982 }
983
984 buf_size = tid_agg_rx->buf_size;
985 head_seq_num = tid_agg_rx->head_seq_num;
986
987 /* frame with out of date sequence number */
988 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
989 dev_kfree_skb(skb);
990 goto out;
991 }
992
993 /*
994 * If frame the sequence number exceeds our buffering window
995 * size release some previous frames to make room for this one.
996 */
997 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
998 head_seq_num = ieee80211_sn_inc(
999 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1000 /* release stored frames up to new head to stack */
1001 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
1002 head_seq_num, frames);
1003 }
1004
1005 /* Now the new frame is always in the range of the reordering buffer */
1006
1007 index = mpdu_seq_num % tid_agg_rx->buf_size;
1008
1009 /* check if we already stored this frame */
1010 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1011 dev_kfree_skb(skb);
1012 goto out;
1013 }
1014
1015 /*
1016 * If the current MPDU is in the right order and nothing else
1017 * is stored we can process it directly, no need to buffer it.
1018 * If it is first but there's something stored, we may be able
1019 * to release frames after this one.
1020 */
1021 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1022 tid_agg_rx->stored_mpdu_num == 0) {
1023 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1024 tid_agg_rx->head_seq_num =
1025 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1026 ret = false;
1027 goto out;
1028 }
1029
1030 /* put the frame in the reordering buffer */
1031 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1032 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1033 tid_agg_rx->reorder_time[index] = jiffies;
1034 tid_agg_rx->stored_mpdu_num++;
1035 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1036 }
1037
1038 out:
1039 spin_unlock(&tid_agg_rx->reorder_lock);
1040 return ret;
1041 }
1042
1043 /*
1044 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1045 * true if the MPDU was buffered, false if it should be processed.
1046 */
1047 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1048 struct sk_buff_head *frames)
1049 {
1050 struct sk_buff *skb = rx->skb;
1051 struct ieee80211_local *local = rx->local;
1052 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1053 struct sta_info *sta = rx->sta;
1054 struct tid_ampdu_rx *tid_agg_rx;
1055 u16 sc;
1056 u8 tid, ack_policy;
1057
1058 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1059 is_multicast_ether_addr(hdr->addr1))
1060 goto dont_reorder;
1061
1062 /*
1063 * filter the QoS data rx stream according to
1064 * STA/TID and check if this STA/TID is on aggregation
1065 */
1066
1067 if (!sta)
1068 goto dont_reorder;
1069
1070 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1071 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1072 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1073
1074 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1075 if (!tid_agg_rx)
1076 goto dont_reorder;
1077
1078 /* qos null data frames are excluded */
1079 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
1080 goto dont_reorder;
1081
1082 /* not part of a BA session */
1083 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1084 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1085 goto dont_reorder;
1086
1087 /* new, potentially un-ordered, ampdu frame - process it */
1088
1089 /* reset session timer */
1090 if (tid_agg_rx->timeout)
1091 tid_agg_rx->last_rx = jiffies;
1092
1093 /* if this mpdu is fragmented - terminate rx aggregation session */
1094 sc = le16_to_cpu(hdr->seq_ctrl);
1095 if (sc & IEEE80211_SCTL_FRAG) {
1096 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
1097 skb_queue_tail(&rx->sdata->skb_queue, skb);
1098 ieee80211_queue_work(&local->hw, &rx->sdata->work);
1099 return;
1100 }
1101
1102 /*
1103 * No locking needed -- we will only ever process one
1104 * RX packet at a time, and thus own tid_agg_rx. All
1105 * other code manipulating it needs to (and does) make
1106 * sure that we cannot get to it any more before doing
1107 * anything with it.
1108 */
1109 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1110 frames))
1111 return;
1112
1113 dont_reorder:
1114 __skb_queue_tail(frames, skb);
1115 }
1116
1117 static ieee80211_rx_result debug_noinline
1118 ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
1119 {
1120 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1122
1123 if (status->flag & RX_FLAG_DUP_VALIDATED)
1124 return RX_CONTINUE;
1125
1126 /*
1127 * Drop duplicate 802.11 retransmissions
1128 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1129 */
1130
1131 if (rx->skb->len < 24)
1132 return RX_CONTINUE;
1133
1134 if (ieee80211_is_ctl(hdr->frame_control) ||
1135 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1136 is_multicast_ether_addr(hdr->addr1))
1137 return RX_CONTINUE;
1138
1139 if (!rx->sta)
1140 return RX_CONTINUE;
1141
1142 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1143 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1144 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
1145 rx->sta->rx_stats.num_duplicates++;
1146 return RX_DROP_UNUSABLE;
1147 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1148 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1149 }
1150
1151 return RX_CONTINUE;
1152 }
1153
1154 static ieee80211_rx_result debug_noinline
1155 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1156 {
1157 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1158
1159 /* Drop disallowed frame classes based on STA auth/assoc state;
1160 * IEEE 802.11, Chap 5.5.
1161 *
1162 * mac80211 filters only based on association state, i.e. it drops
1163 * Class 3 frames from not associated stations. hostapd sends
1164 * deauth/disassoc frames when needed. In addition, hostapd is
1165 * responsible for filtering on both auth and assoc states.
1166 */
1167
1168 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1169 return ieee80211_rx_mesh_check(rx);
1170
1171 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1172 ieee80211_is_pspoll(hdr->frame_control)) &&
1173 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1174 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1175 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
1176 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1177 /*
1178 * accept port control frames from the AP even when it's not
1179 * yet marked ASSOC to prevent a race where we don't set the
1180 * assoc bit quickly enough before it sends the first frame
1181 */
1182 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1183 ieee80211_is_data_present(hdr->frame_control)) {
1184 unsigned int hdrlen;
1185 __be16 ethertype;
1186
1187 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1188
1189 if (rx->skb->len < hdrlen + 8)
1190 return RX_DROP_MONITOR;
1191
1192 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1193 if (ethertype == rx->sdata->control_port_protocol)
1194 return RX_CONTINUE;
1195 }
1196
1197 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1198 cfg80211_rx_spurious_frame(rx->sdata->dev,
1199 hdr->addr2,
1200 GFP_ATOMIC))
1201 return RX_DROP_UNUSABLE;
1202
1203 return RX_DROP_MONITOR;
1204 }
1205
1206 return RX_CONTINUE;
1207 }
1208
1209
1210 static ieee80211_rx_result debug_noinline
1211 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1212 {
1213 struct ieee80211_local *local;
1214 struct ieee80211_hdr *hdr;
1215 struct sk_buff *skb;
1216
1217 local = rx->local;
1218 skb = rx->skb;
1219 hdr = (struct ieee80211_hdr *) skb->data;
1220
1221 if (!local->pspolling)
1222 return RX_CONTINUE;
1223
1224 if (!ieee80211_has_fromds(hdr->frame_control))
1225 /* this is not from AP */
1226 return RX_CONTINUE;
1227
1228 if (!ieee80211_is_data(hdr->frame_control))
1229 return RX_CONTINUE;
1230
1231 if (!ieee80211_has_moredata(hdr->frame_control)) {
1232 /* AP has no more frames buffered for us */
1233 local->pspolling = false;
1234 return RX_CONTINUE;
1235 }
1236
1237 /* more data bit is set, let's request a new frame from the AP */
1238 ieee80211_send_pspoll(local, rx->sdata);
1239
1240 return RX_CONTINUE;
1241 }
1242
1243 static void sta_ps_start(struct sta_info *sta)
1244 {
1245 struct ieee80211_sub_if_data *sdata = sta->sdata;
1246 struct ieee80211_local *local = sdata->local;
1247 struct ps_data *ps;
1248 int tid;
1249
1250 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1251 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252 ps = &sdata->bss->ps;
1253 else
1254 return;
1255
1256 atomic_inc(&ps->num_sta_ps);
1257 set_sta_flag(sta, WLAN_STA_PS_STA);
1258 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1259 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1260 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1261 sta->sta.addr, sta->sta.aid);
1262
1263 ieee80211_clear_fast_xmit(sta);
1264
1265 if (!sta->sta.txq[0])
1266 return;
1267
1268 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1269 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1270
1271 if (!skb_queue_len(&txqi->queue))
1272 set_bit(tid, &sta->txq_buffered_tids);
1273 else
1274 clear_bit(tid, &sta->txq_buffered_tids);
1275 }
1276 }
1277
1278 static void sta_ps_end(struct sta_info *sta)
1279 {
1280 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1281 sta->sta.addr, sta->sta.aid);
1282
1283 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1284 /*
1285 * Clear the flag only if the other one is still set
1286 * so that the TX path won't start TX'ing new frames
1287 * directly ... In the case that the driver flag isn't
1288 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1289 */
1290 clear_sta_flag(sta, WLAN_STA_PS_STA);
1291 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1292 sta->sta.addr, sta->sta.aid);
1293 return;
1294 }
1295
1296 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1297 clear_sta_flag(sta, WLAN_STA_PS_STA);
1298 ieee80211_sta_ps_deliver_wakeup(sta);
1299 }
1300
1301 int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
1302 {
1303 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1304 bool in_ps;
1305
1306 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
1307
1308 /* Don't let the same PS state be set twice */
1309 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
1310 if ((start && in_ps) || (!start && !in_ps))
1311 return -EINVAL;
1312
1313 if (start)
1314 sta_ps_start(sta);
1315 else
1316 sta_ps_end(sta);
1317
1318 return 0;
1319 }
1320 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1321
1322 static ieee80211_rx_result debug_noinline
1323 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1324 {
1325 struct ieee80211_sub_if_data *sdata = rx->sdata;
1326 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1327 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1328 int tid, ac;
1329
1330 if (!rx->sta)
1331 return RX_CONTINUE;
1332
1333 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1334 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1335 return RX_CONTINUE;
1336
1337 /*
1338 * The device handles station powersave, so don't do anything about
1339 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1340 * it to mac80211 since they're handled.)
1341 */
1342 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
1343 return RX_CONTINUE;
1344
1345 /*
1346 * Don't do anything if the station isn't already asleep. In
1347 * the uAPSD case, the station will probably be marked asleep,
1348 * in the PS-Poll case the station must be confused ...
1349 */
1350 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1351 return RX_CONTINUE;
1352
1353 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1354 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1355 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1356 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1357 else
1358 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1359 }
1360
1361 /* Free PS Poll skb here instead of returning RX_DROP that would
1362 * count as an dropped frame. */
1363 dev_kfree_skb(rx->skb);
1364
1365 return RX_QUEUED;
1366 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1367 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1368 ieee80211_has_pm(hdr->frame_control) &&
1369 (ieee80211_is_data_qos(hdr->frame_control) ||
1370 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1371 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1372 ac = ieee802_1d_to_ac[tid & 7];
1373
1374 /*
1375 * If this AC is not trigger-enabled do nothing.
1376 *
1377 * NB: This could/should check a separate bitmap of trigger-
1378 * enabled queues, but for now we only implement uAPSD w/o
1379 * TSPEC changes to the ACs, so they're always the same.
1380 */
1381 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1382 return RX_CONTINUE;
1383
1384 /* if we are in a service period, do nothing */
1385 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1386 return RX_CONTINUE;
1387
1388 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1389 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1390 else
1391 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1392 }
1393
1394 return RX_CONTINUE;
1395 }
1396
1397 static ieee80211_rx_result debug_noinline
1398 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1399 {
1400 struct sta_info *sta = rx->sta;
1401 struct sk_buff *skb = rx->skb;
1402 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1404 int i;
1405
1406 if (!sta)
1407 return RX_CONTINUE;
1408
1409 /*
1410 * Update last_rx only for IBSS packets which are for the current
1411 * BSSID and for station already AUTHORIZED to avoid keeping the
1412 * current IBSS network alive in cases where other STAs start
1413 * using different BSSID. This will also give the station another
1414 * chance to restart the authentication/authorization in case
1415 * something went wrong the first time.
1416 */
1417 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1418 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1419 NL80211_IFTYPE_ADHOC);
1420 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1421 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1422 sta->rx_stats.last_rx = jiffies;
1423 if (ieee80211_is_data(hdr->frame_control) &&
1424 !is_multicast_ether_addr(hdr->addr1)) {
1425 sta->rx_stats.last_rate_idx =
1426 status->rate_idx;
1427 sta->rx_stats.last_rate_flag =
1428 status->flag;
1429 sta->rx_stats.last_rate_vht_flag =
1430 status->vht_flag;
1431 sta->rx_stats.last_rate_vht_nss =
1432 status->vht_nss;
1433 }
1434 }
1435 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1436 sta->rx_stats.last_rx = jiffies;
1437 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1438 /*
1439 * Mesh beacons will update last_rx when if they are found to
1440 * match the current local configuration when processed.
1441 */
1442 sta->rx_stats.last_rx = jiffies;
1443 if (ieee80211_is_data(hdr->frame_control)) {
1444 sta->rx_stats.last_rate_idx = status->rate_idx;
1445 sta->rx_stats.last_rate_flag = status->flag;
1446 sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1447 sta->rx_stats.last_rate_vht_nss = status->vht_nss;
1448 }
1449 }
1450
1451 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1452 ieee80211_sta_rx_notify(rx->sdata, hdr);
1453
1454 sta->rx_stats.fragments++;
1455 sta->rx_stats.bytes += rx->skb->len;
1456 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1457 sta->rx_stats.last_signal = status->signal;
1458 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
1459 }
1460
1461 if (status->chains) {
1462 sta->rx_stats.chains = status->chains;
1463 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1464 int signal = status->chain_signal[i];
1465
1466 if (!(status->chains & BIT(i)))
1467 continue;
1468
1469 sta->rx_stats.chain_signal_last[i] = signal;
1470 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1471 -signal);
1472 }
1473 }
1474
1475 /*
1476 * Change STA power saving mode only at the end of a frame
1477 * exchange sequence.
1478 */
1479 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
1480 !ieee80211_has_morefrags(hdr->frame_control) &&
1481 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1482 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1483 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1484 /* PM bit is only checked in frames where it isn't reserved,
1485 * in AP mode it's reserved in non-bufferable management frames
1486 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1487 */
1488 (!ieee80211_is_mgmt(hdr->frame_control) ||
1489 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1490 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1491 if (!ieee80211_has_pm(hdr->frame_control))
1492 sta_ps_end(sta);
1493 } else {
1494 if (ieee80211_has_pm(hdr->frame_control))
1495 sta_ps_start(sta);
1496 }
1497 }
1498
1499 /* mesh power save support */
1500 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1501 ieee80211_mps_rx_h_sta_process(sta, hdr);
1502
1503 /*
1504 * Drop (qos-)data::nullfunc frames silently, since they
1505 * are used only to control station power saving mode.
1506 */
1507 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1508 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1509 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1510
1511 /*
1512 * If we receive a 4-addr nullfunc frame from a STA
1513 * that was not moved to a 4-addr STA vlan yet send
1514 * the event to userspace and for older hostapd drop
1515 * the frame to the monitor interface.
1516 */
1517 if (ieee80211_has_a4(hdr->frame_control) &&
1518 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1519 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1520 !rx->sdata->u.vlan.sta))) {
1521 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1522 cfg80211_rx_unexpected_4addr_frame(
1523 rx->sdata->dev, sta->sta.addr,
1524 GFP_ATOMIC);
1525 return RX_DROP_MONITOR;
1526 }
1527 /*
1528 * Update counter and free packet here to avoid
1529 * counting this as a dropped packed.
1530 */
1531 sta->rx_stats.packets++;
1532 dev_kfree_skb(rx->skb);
1533 return RX_QUEUED;
1534 }
1535
1536 return RX_CONTINUE;
1537 } /* ieee80211_rx_h_sta_process */
1538
1539 static ieee80211_rx_result debug_noinline
1540 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1541 {
1542 struct sk_buff *skb = rx->skb;
1543 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1544 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1545 int keyidx;
1546 int hdrlen;
1547 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1548 struct ieee80211_key *sta_ptk = NULL;
1549 int mmie_keyidx = -1;
1550 __le16 fc;
1551 const struct ieee80211_cipher_scheme *cs = NULL;
1552
1553 /*
1554 * Key selection 101
1555 *
1556 * There are four types of keys:
1557 * - GTK (group keys)
1558 * - IGTK (group keys for management frames)
1559 * - PTK (pairwise keys)
1560 * - STK (station-to-station pairwise keys)
1561 *
1562 * When selecting a key, we have to distinguish between multicast
1563 * (including broadcast) and unicast frames, the latter can only
1564 * use PTKs and STKs while the former always use GTKs and IGTKs.
1565 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1566 * unicast frames can also use key indices like GTKs. Hence, if we
1567 * don't have a PTK/STK we check the key index for a WEP key.
1568 *
1569 * Note that in a regular BSS, multicast frames are sent by the
1570 * AP only, associated stations unicast the frame to the AP first
1571 * which then multicasts it on their behalf.
1572 *
1573 * There is also a slight problem in IBSS mode: GTKs are negotiated
1574 * with each station, that is something we don't currently handle.
1575 * The spec seems to expect that one negotiates the same key with
1576 * every station but there's no such requirement; VLANs could be
1577 * possible.
1578 */
1579
1580 /* start without a key */
1581 rx->key = NULL;
1582 fc = hdr->frame_control;
1583
1584 if (rx->sta) {
1585 int keyid = rx->sta->ptk_idx;
1586
1587 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1588 cs = rx->sta->cipher_scheme;
1589 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1590 if (unlikely(keyid < 0))
1591 return RX_DROP_UNUSABLE;
1592 }
1593 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1594 }
1595
1596 if (!ieee80211_has_protected(fc))
1597 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1598
1599 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1600 rx->key = sta_ptk;
1601 if ((status->flag & RX_FLAG_DECRYPTED) &&
1602 (status->flag & RX_FLAG_IV_STRIPPED))
1603 return RX_CONTINUE;
1604 /* Skip decryption if the frame is not protected. */
1605 if (!ieee80211_has_protected(fc))
1606 return RX_CONTINUE;
1607 } else if (mmie_keyidx >= 0) {
1608 /* Broadcast/multicast robust management frame / BIP */
1609 if ((status->flag & RX_FLAG_DECRYPTED) &&
1610 (status->flag & RX_FLAG_IV_STRIPPED))
1611 return RX_CONTINUE;
1612
1613 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1614 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1615 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1616 if (rx->sta)
1617 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1618 if (!rx->key)
1619 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1620 } else if (!ieee80211_has_protected(fc)) {
1621 /*
1622 * The frame was not protected, so skip decryption. However, we
1623 * need to set rx->key if there is a key that could have been
1624 * used so that the frame may be dropped if encryption would
1625 * have been expected.
1626 */
1627 struct ieee80211_key *key = NULL;
1628 struct ieee80211_sub_if_data *sdata = rx->sdata;
1629 int i;
1630
1631 if (ieee80211_is_mgmt(fc) &&
1632 is_multicast_ether_addr(hdr->addr1) &&
1633 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1634 rx->key = key;
1635 else {
1636 if (rx->sta) {
1637 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1638 key = rcu_dereference(rx->sta->gtk[i]);
1639 if (key)
1640 break;
1641 }
1642 }
1643 if (!key) {
1644 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1645 key = rcu_dereference(sdata->keys[i]);
1646 if (key)
1647 break;
1648 }
1649 }
1650 if (key)
1651 rx->key = key;
1652 }
1653 return RX_CONTINUE;
1654 } else {
1655 u8 keyid;
1656
1657 /*
1658 * The device doesn't give us the IV so we won't be
1659 * able to look up the key. That's ok though, we
1660 * don't need to decrypt the frame, we just won't
1661 * be able to keep statistics accurate.
1662 * Except for key threshold notifications, should
1663 * we somehow allow the driver to tell us which key
1664 * the hardware used if this flag is set?
1665 */
1666 if ((status->flag & RX_FLAG_DECRYPTED) &&
1667 (status->flag & RX_FLAG_IV_STRIPPED))
1668 return RX_CONTINUE;
1669
1670 hdrlen = ieee80211_hdrlen(fc);
1671
1672 if (cs) {
1673 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1674
1675 if (unlikely(keyidx < 0))
1676 return RX_DROP_UNUSABLE;
1677 } else {
1678 if (rx->skb->len < 8 + hdrlen)
1679 return RX_DROP_UNUSABLE; /* TODO: count this? */
1680 /*
1681 * no need to call ieee80211_wep_get_keyidx,
1682 * it verifies a bunch of things we've done already
1683 */
1684 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1685 keyidx = keyid >> 6;
1686 }
1687
1688 /* check per-station GTK first, if multicast packet */
1689 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1690 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1691
1692 /* if not found, try default key */
1693 if (!rx->key) {
1694 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1695
1696 /*
1697 * RSNA-protected unicast frames should always be
1698 * sent with pairwise or station-to-station keys,
1699 * but for WEP we allow using a key index as well.
1700 */
1701 if (rx->key &&
1702 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1703 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1704 !is_multicast_ether_addr(hdr->addr1))
1705 rx->key = NULL;
1706 }
1707 }
1708
1709 if (rx->key) {
1710 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1711 return RX_DROP_MONITOR;
1712
1713 /* TODO: add threshold stuff again */
1714 } else {
1715 return RX_DROP_MONITOR;
1716 }
1717
1718 switch (rx->key->conf.cipher) {
1719 case WLAN_CIPHER_SUITE_WEP40:
1720 case WLAN_CIPHER_SUITE_WEP104:
1721 result = ieee80211_crypto_wep_decrypt(rx);
1722 break;
1723 case WLAN_CIPHER_SUITE_TKIP:
1724 result = ieee80211_crypto_tkip_decrypt(rx);
1725 break;
1726 case WLAN_CIPHER_SUITE_CCMP:
1727 result = ieee80211_crypto_ccmp_decrypt(
1728 rx, IEEE80211_CCMP_MIC_LEN);
1729 break;
1730 case WLAN_CIPHER_SUITE_CCMP_256:
1731 result = ieee80211_crypto_ccmp_decrypt(
1732 rx, IEEE80211_CCMP_256_MIC_LEN);
1733 break;
1734 case WLAN_CIPHER_SUITE_AES_CMAC:
1735 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1736 break;
1737 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1738 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1739 break;
1740 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1741 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1742 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1743 break;
1744 case WLAN_CIPHER_SUITE_GCMP:
1745 case WLAN_CIPHER_SUITE_GCMP_256:
1746 result = ieee80211_crypto_gcmp_decrypt(rx);
1747 break;
1748 default:
1749 result = ieee80211_crypto_hw_decrypt(rx);
1750 }
1751
1752 /* the hdr variable is invalid after the decrypt handlers */
1753
1754 /* either the frame has been decrypted or will be dropped */
1755 status->flag |= RX_FLAG_DECRYPTED;
1756
1757 return result;
1758 }
1759
1760 static inline struct ieee80211_fragment_entry *
1761 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1762 unsigned int frag, unsigned int seq, int rx_queue,
1763 struct sk_buff **skb)
1764 {
1765 struct ieee80211_fragment_entry *entry;
1766
1767 entry = &sdata->fragments[sdata->fragment_next++];
1768 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1769 sdata->fragment_next = 0;
1770
1771 if (!skb_queue_empty(&entry->skb_list))
1772 __skb_queue_purge(&entry->skb_list);
1773
1774 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1775 *skb = NULL;
1776 entry->first_frag_time = jiffies;
1777 entry->seq = seq;
1778 entry->rx_queue = rx_queue;
1779 entry->last_frag = frag;
1780 entry->check_sequential_pn = false;
1781 entry->extra_len = 0;
1782
1783 return entry;
1784 }
1785
1786 static inline struct ieee80211_fragment_entry *
1787 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1788 unsigned int frag, unsigned int seq,
1789 int rx_queue, struct ieee80211_hdr *hdr)
1790 {
1791 struct ieee80211_fragment_entry *entry;
1792 int i, idx;
1793
1794 idx = sdata->fragment_next;
1795 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1796 struct ieee80211_hdr *f_hdr;
1797
1798 idx--;
1799 if (idx < 0)
1800 idx = IEEE80211_FRAGMENT_MAX - 1;
1801
1802 entry = &sdata->fragments[idx];
1803 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1804 entry->rx_queue != rx_queue ||
1805 entry->last_frag + 1 != frag)
1806 continue;
1807
1808 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1809
1810 /*
1811 * Check ftype and addresses are equal, else check next fragment
1812 */
1813 if (((hdr->frame_control ^ f_hdr->frame_control) &
1814 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1815 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1816 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1817 continue;
1818
1819 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1820 __skb_queue_purge(&entry->skb_list);
1821 continue;
1822 }
1823 return entry;
1824 }
1825
1826 return NULL;
1827 }
1828
1829 static ieee80211_rx_result debug_noinline
1830 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1831 {
1832 struct ieee80211_hdr *hdr;
1833 u16 sc;
1834 __le16 fc;
1835 unsigned int frag, seq;
1836 struct ieee80211_fragment_entry *entry;
1837 struct sk_buff *skb;
1838 struct ieee80211_rx_status *status;
1839
1840 hdr = (struct ieee80211_hdr *)rx->skb->data;
1841 fc = hdr->frame_control;
1842
1843 if (ieee80211_is_ctl(fc))
1844 return RX_CONTINUE;
1845
1846 sc = le16_to_cpu(hdr->seq_ctrl);
1847 frag = sc & IEEE80211_SCTL_FRAG;
1848
1849 if (is_multicast_ether_addr(hdr->addr1)) {
1850 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
1851 goto out_no_led;
1852 }
1853
1854 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1855 goto out;
1856
1857 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1858
1859 if (skb_linearize(rx->skb))
1860 return RX_DROP_UNUSABLE;
1861
1862 /*
1863 * skb_linearize() might change the skb->data and
1864 * previously cached variables (in this case, hdr) need to
1865 * be refreshed with the new data.
1866 */
1867 hdr = (struct ieee80211_hdr *)rx->skb->data;
1868 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1869
1870 if (frag == 0) {
1871 /* This is the first fragment of a new frame. */
1872 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1873 rx->seqno_idx, &(rx->skb));
1874 if (rx->key &&
1875 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1876 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1877 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1878 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
1879 ieee80211_has_protected(fc)) {
1880 int queue = rx->security_idx;
1881
1882 /* Store CCMP/GCMP PN so that we can verify that the
1883 * next fragment has a sequential PN value.
1884 */
1885 entry->check_sequential_pn = true;
1886 memcpy(entry->last_pn,
1887 rx->key->u.ccmp.rx_pn[queue],
1888 IEEE80211_CCMP_PN_LEN);
1889 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1890 u.ccmp.rx_pn) !=
1891 offsetof(struct ieee80211_key,
1892 u.gcmp.rx_pn));
1893 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1894 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1895 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1896 IEEE80211_GCMP_PN_LEN);
1897 }
1898 return RX_QUEUED;
1899 }
1900
1901 /* This is a fragment for a frame that should already be pending in
1902 * fragment cache. Add this fragment to the end of the pending entry.
1903 */
1904 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1905 rx->seqno_idx, hdr);
1906 if (!entry) {
1907 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1908 return RX_DROP_MONITOR;
1909 }
1910
1911 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1912 * MPDU PN values are not incrementing in steps of 1."
1913 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1914 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1915 */
1916 if (entry->check_sequential_pn) {
1917 int i;
1918 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1919 int queue;
1920
1921 if (!rx->key ||
1922 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1923 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1924 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1925 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
1926 return RX_DROP_UNUSABLE;
1927 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1928 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1929 pn[i]++;
1930 if (pn[i])
1931 break;
1932 }
1933 queue = rx->security_idx;
1934 rpn = rx->key->u.ccmp.rx_pn[queue];
1935 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1936 return RX_DROP_UNUSABLE;
1937 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1938 }
1939
1940 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1941 __skb_queue_tail(&entry->skb_list, rx->skb);
1942 entry->last_frag = frag;
1943 entry->extra_len += rx->skb->len;
1944 if (ieee80211_has_morefrags(fc)) {
1945 rx->skb = NULL;
1946 return RX_QUEUED;
1947 }
1948
1949 rx->skb = __skb_dequeue(&entry->skb_list);
1950 if (skb_tailroom(rx->skb) < entry->extra_len) {
1951 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
1952 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1953 GFP_ATOMIC))) {
1954 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1955 __skb_queue_purge(&entry->skb_list);
1956 return RX_DROP_UNUSABLE;
1957 }
1958 }
1959 while ((skb = __skb_dequeue(&entry->skb_list))) {
1960 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1961 dev_kfree_skb(skb);
1962 }
1963
1964 /* Complete frame has been reassembled - process it now */
1965 status = IEEE80211_SKB_RXCB(rx->skb);
1966
1967 out:
1968 ieee80211_led_rx(rx->local);
1969 out_no_led:
1970 if (rx->sta)
1971 rx->sta->rx_stats.packets++;
1972 return RX_CONTINUE;
1973 }
1974
1975 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1976 {
1977 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1978 return -EACCES;
1979
1980 return 0;
1981 }
1982
1983 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1984 {
1985 struct sk_buff *skb = rx->skb;
1986 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1987
1988 /*
1989 * Pass through unencrypted frames if the hardware has
1990 * decrypted them already.
1991 */
1992 if (status->flag & RX_FLAG_DECRYPTED)
1993 return 0;
1994
1995 /* Drop unencrypted frames if key is set. */
1996 if (unlikely(!ieee80211_has_protected(fc) &&
1997 !ieee80211_is_nullfunc(fc) &&
1998 ieee80211_is_data(fc) && rx->key))
1999 return -EACCES;
2000
2001 return 0;
2002 }
2003
2004 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
2005 {
2006 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2007 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2008 __le16 fc = hdr->frame_control;
2009
2010 /*
2011 * Pass through unencrypted frames if the hardware has
2012 * decrypted them already.
2013 */
2014 if (status->flag & RX_FLAG_DECRYPTED)
2015 return 0;
2016
2017 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
2018 if (unlikely(!ieee80211_has_protected(fc) &&
2019 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
2020 rx->key)) {
2021 if (ieee80211_is_deauth(fc) ||
2022 ieee80211_is_disassoc(fc))
2023 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2024 rx->skb->data,
2025 rx->skb->len);
2026 return -EACCES;
2027 }
2028 /* BIP does not use Protected field, so need to check MMIE */
2029 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
2030 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
2031 if (ieee80211_is_deauth(fc) ||
2032 ieee80211_is_disassoc(fc))
2033 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2034 rx->skb->data,
2035 rx->skb->len);
2036 return -EACCES;
2037 }
2038 /*
2039 * When using MFP, Action frames are not allowed prior to
2040 * having configured keys.
2041 */
2042 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
2043 ieee80211_is_robust_mgmt_frame(rx->skb)))
2044 return -EACCES;
2045 }
2046
2047 return 0;
2048 }
2049
2050 static int
2051 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
2052 {
2053 struct ieee80211_sub_if_data *sdata = rx->sdata;
2054 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2055 bool check_port_control = false;
2056 struct ethhdr *ehdr;
2057 int ret;
2058
2059 *port_control = false;
2060 if (ieee80211_has_a4(hdr->frame_control) &&
2061 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
2062 return -1;
2063
2064 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2065 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2066
2067 if (!sdata->u.mgd.use_4addr)
2068 return -1;
2069 else
2070 check_port_control = true;
2071 }
2072
2073 if (is_multicast_ether_addr(hdr->addr1) &&
2074 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
2075 return -1;
2076
2077 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
2078 if (ret < 0)
2079 return ret;
2080
2081 ehdr = (struct ethhdr *) rx->skb->data;
2082 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2083 *port_control = true;
2084 else if (check_port_control)
2085 return -1;
2086
2087 return 0;
2088 }
2089
2090 /*
2091 * requires that rx->skb is a frame with ethernet header
2092 */
2093 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
2094 {
2095 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
2096 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2097 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2098
2099 /*
2100 * Allow EAPOL frames to us/the PAE group address regardless
2101 * of whether the frame was encrypted or not.
2102 */
2103 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
2104 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2105 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
2106 return true;
2107
2108 if (ieee80211_802_1x_port_control(rx) ||
2109 ieee80211_drop_unencrypted(rx, fc))
2110 return false;
2111
2112 return true;
2113 }
2114
2115 /*
2116 * requires that rx->skb is a frame with ethernet header
2117 */
2118 static void
2119 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
2120 {
2121 struct ieee80211_sub_if_data *sdata = rx->sdata;
2122 struct net_device *dev = sdata->dev;
2123 struct sk_buff *skb, *xmit_skb;
2124 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2125 struct sta_info *dsta;
2126
2127 skb = rx->skb;
2128 xmit_skb = NULL;
2129
2130 ieee80211_rx_stats(dev, skb->len);
2131
2132 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2133 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
2134 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
2135 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
2136 if (is_multicast_ether_addr(ehdr->h_dest)) {
2137 /*
2138 * send multicast frames both to higher layers in
2139 * local net stack and back to the wireless medium
2140 */
2141 xmit_skb = skb_copy(skb, GFP_ATOMIC);
2142 if (!xmit_skb)
2143 net_info_ratelimited("%s: failed to clone multicast frame\n",
2144 dev->name);
2145 } else {
2146 dsta = sta_info_get(sdata, skb->data);
2147 if (dsta) {
2148 /*
2149 * The destination station is associated to
2150 * this AP (in this VLAN), so send the frame
2151 * directly to it and do not pass it to local
2152 * net stack.
2153 */
2154 xmit_skb = skb;
2155 skb = NULL;
2156 }
2157 }
2158 }
2159
2160 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2161 if (skb) {
2162 /* 'align' will only take the values 0 or 2 here since all
2163 * frames are required to be aligned to 2-byte boundaries
2164 * when being passed to mac80211; the code here works just
2165 * as well if that isn't true, but mac80211 assumes it can
2166 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
2167 */
2168 int align;
2169
2170 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
2171 if (align) {
2172 if (WARN_ON(skb_headroom(skb) < 3)) {
2173 dev_kfree_skb(skb);
2174 skb = NULL;
2175 } else {
2176 u8 *data = skb->data;
2177 size_t len = skb_headlen(skb);
2178 skb->data -= align;
2179 memmove(skb->data, data, len);
2180 skb_set_tail_pointer(skb, len);
2181 }
2182 }
2183 }
2184 #endif
2185
2186 if (skb) {
2187 /* deliver to local stack */
2188 skb->protocol = eth_type_trans(skb, dev);
2189 memset(skb->cb, 0, sizeof(skb->cb));
2190 if (rx->napi)
2191 napi_gro_receive(rx->napi, skb);
2192 else
2193 netif_receive_skb(skb);
2194 }
2195
2196 if (xmit_skb) {
2197 /*
2198 * Send to wireless media and increase priority by 256 to
2199 * keep the received priority instead of reclassifying
2200 * the frame (see cfg80211_classify8021d).
2201 */
2202 xmit_skb->priority += 256;
2203 xmit_skb->protocol = htons(ETH_P_802_3);
2204 skb_reset_network_header(xmit_skb);
2205 skb_reset_mac_header(xmit_skb);
2206 dev_queue_xmit(xmit_skb);
2207 }
2208 }
2209
2210 static ieee80211_rx_result debug_noinline
2211 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2212 {
2213 struct net_device *dev = rx->sdata->dev;
2214 struct sk_buff *skb = rx->skb;
2215 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2216 __le16 fc = hdr->frame_control;
2217 struct sk_buff_head frame_list;
2218 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2219
2220 if (unlikely(!ieee80211_is_data(fc)))
2221 return RX_CONTINUE;
2222
2223 if (unlikely(!ieee80211_is_data_present(fc)))
2224 return RX_DROP_MONITOR;
2225
2226 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2227 return RX_CONTINUE;
2228
2229 if (ieee80211_has_a4(hdr->frame_control) &&
2230 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2231 !rx->sdata->u.vlan.sta)
2232 return RX_DROP_UNUSABLE;
2233
2234 if (is_multicast_ether_addr(hdr->addr1) &&
2235 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2236 rx->sdata->u.vlan.sta) ||
2237 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2238 rx->sdata->u.mgd.use_4addr)))
2239 return RX_DROP_UNUSABLE;
2240
2241 skb->dev = dev;
2242 __skb_queue_head_init(&frame_list);
2243
2244 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2245 rx->sdata->vif.type,
2246 rx->local->hw.extra_tx_headroom, true);
2247
2248 while (!skb_queue_empty(&frame_list)) {
2249 rx->skb = __skb_dequeue(&frame_list);
2250
2251 if (!ieee80211_frame_allowed(rx, fc)) {
2252 dev_kfree_skb(rx->skb);
2253 continue;
2254 }
2255
2256 ieee80211_deliver_skb(rx);
2257 }
2258
2259 return RX_QUEUED;
2260 }
2261
2262 #ifdef CONFIG_MAC80211_MESH
2263 static ieee80211_rx_result
2264 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2265 {
2266 struct ieee80211_hdr *fwd_hdr, *hdr;
2267 struct ieee80211_tx_info *info;
2268 struct ieee80211s_hdr *mesh_hdr;
2269 struct sk_buff *skb = rx->skb, *fwd_skb;
2270 struct ieee80211_local *local = rx->local;
2271 struct ieee80211_sub_if_data *sdata = rx->sdata;
2272 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2273 u16 ac, q, hdrlen;
2274
2275 hdr = (struct ieee80211_hdr *) skb->data;
2276 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2277
2278 /* make sure fixed part of mesh header is there, also checks skb len */
2279 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2280 return RX_DROP_MONITOR;
2281
2282 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2283
2284 /* make sure full mesh header is there, also checks skb len */
2285 if (!pskb_may_pull(rx->skb,
2286 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2287 return RX_DROP_MONITOR;
2288
2289 /* reload pointers */
2290 hdr = (struct ieee80211_hdr *) skb->data;
2291 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2292
2293 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2294 return RX_DROP_MONITOR;
2295
2296 /* frame is in RMC, don't forward */
2297 if (ieee80211_is_data(hdr->frame_control) &&
2298 is_multicast_ether_addr(hdr->addr1) &&
2299 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2300 return RX_DROP_MONITOR;
2301
2302 if (!ieee80211_is_data(hdr->frame_control))
2303 return RX_CONTINUE;
2304
2305 if (!mesh_hdr->ttl)
2306 return RX_DROP_MONITOR;
2307
2308 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2309 struct mesh_path *mppath;
2310 char *proxied_addr;
2311 char *mpp_addr;
2312
2313 if (is_multicast_ether_addr(hdr->addr1)) {
2314 mpp_addr = hdr->addr3;
2315 proxied_addr = mesh_hdr->eaddr1;
2316 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2317 /* has_a4 already checked in ieee80211_rx_mesh_check */
2318 mpp_addr = hdr->addr4;
2319 proxied_addr = mesh_hdr->eaddr2;
2320 } else {
2321 return RX_DROP_MONITOR;
2322 }
2323
2324 rcu_read_lock();
2325 mppath = mpp_path_lookup(sdata, proxied_addr);
2326 if (!mppath) {
2327 mpp_path_add(sdata, proxied_addr, mpp_addr);
2328 } else {
2329 spin_lock_bh(&mppath->state_lock);
2330 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2331 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2332 mppath->exp_time = jiffies;
2333 spin_unlock_bh(&mppath->state_lock);
2334 }
2335 rcu_read_unlock();
2336 }
2337
2338 /* Frame has reached destination. Don't forward */
2339 if (!is_multicast_ether_addr(hdr->addr1) &&
2340 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2341 return RX_CONTINUE;
2342
2343 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2344 q = sdata->vif.hw_queue[ac];
2345 if (ieee80211_queue_stopped(&local->hw, q)) {
2346 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2347 return RX_DROP_MONITOR;
2348 }
2349 skb_set_queue_mapping(skb, q);
2350
2351 if (!--mesh_hdr->ttl) {
2352 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2353 goto out;
2354 }
2355
2356 if (!ifmsh->mshcfg.dot11MeshForwarding)
2357 goto out;
2358
2359 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2360 if (!fwd_skb) {
2361 net_info_ratelimited("%s: failed to clone mesh frame\n",
2362 sdata->name);
2363 goto out;
2364 }
2365
2366 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2367 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2368 info = IEEE80211_SKB_CB(fwd_skb);
2369 memset(info, 0, sizeof(*info));
2370 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2371 info->control.vif = &rx->sdata->vif;
2372 info->control.jiffies = jiffies;
2373 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2374 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2375 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2376 /* update power mode indication when forwarding */
2377 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2378 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2379 /* mesh power mode flags updated in mesh_nexthop_lookup */
2380 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2381 } else {
2382 /* unable to resolve next hop */
2383 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2384 fwd_hdr->addr3, 0,
2385 WLAN_REASON_MESH_PATH_NOFORWARD,
2386 fwd_hdr->addr2);
2387 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2388 kfree_skb(fwd_skb);
2389 return RX_DROP_MONITOR;
2390 }
2391
2392 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2393 ieee80211_add_pending_skb(local, fwd_skb);
2394 out:
2395 if (is_multicast_ether_addr(hdr->addr1))
2396 return RX_CONTINUE;
2397 return RX_DROP_MONITOR;
2398 }
2399 #endif
2400
2401 static ieee80211_rx_result debug_noinline
2402 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2403 {
2404 struct ieee80211_sub_if_data *sdata = rx->sdata;
2405 struct ieee80211_local *local = rx->local;
2406 struct net_device *dev = sdata->dev;
2407 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2408 __le16 fc = hdr->frame_control;
2409 bool port_control;
2410 int err;
2411
2412 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2413 return RX_CONTINUE;
2414
2415 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2416 return RX_DROP_MONITOR;
2417
2418 if (rx->sta) {
2419 /* The seqno index has the same property as needed
2420 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2421 * for non-QoS-data frames. Here we know it's a data
2422 * frame, so count MSDUs.
2423 */
2424 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
2425 }
2426
2427 /*
2428 * Send unexpected-4addr-frame event to hostapd. For older versions,
2429 * also drop the frame to cooked monitor interfaces.
2430 */
2431 if (ieee80211_has_a4(hdr->frame_control) &&
2432 sdata->vif.type == NL80211_IFTYPE_AP) {
2433 if (rx->sta &&
2434 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2435 cfg80211_rx_unexpected_4addr_frame(
2436 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2437 return RX_DROP_MONITOR;
2438 }
2439
2440 err = __ieee80211_data_to_8023(rx, &port_control);
2441 if (unlikely(err))
2442 return RX_DROP_UNUSABLE;
2443
2444 if (!ieee80211_frame_allowed(rx, fc))
2445 return RX_DROP_MONITOR;
2446
2447 /* directly handle TDLS channel switch requests/responses */
2448 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2449 cpu_to_be16(ETH_P_TDLS))) {
2450 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2451
2452 if (pskb_may_pull(rx->skb,
2453 offsetof(struct ieee80211_tdls_data, u)) &&
2454 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2455 tf->category == WLAN_CATEGORY_TDLS &&
2456 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2457 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2458 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2459 schedule_work(&local->tdls_chsw_work);
2460 if (rx->sta)
2461 rx->sta->rx_stats.packets++;
2462
2463 return RX_QUEUED;
2464 }
2465 }
2466
2467 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2468 unlikely(port_control) && sdata->bss) {
2469 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2470 u.ap);
2471 dev = sdata->dev;
2472 rx->sdata = sdata;
2473 }
2474
2475 rx->skb->dev = dev;
2476
2477 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2478 !is_multicast_ether_addr(
2479 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2480 (!local->scanning &&
2481 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2482 mod_timer(&local->dynamic_ps_timer, jiffies +
2483 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2484 }
2485
2486 ieee80211_deliver_skb(rx);
2487
2488 return RX_QUEUED;
2489 }
2490
2491 static ieee80211_rx_result debug_noinline
2492 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2493 {
2494 struct sk_buff *skb = rx->skb;
2495 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2496 struct tid_ampdu_rx *tid_agg_rx;
2497 u16 start_seq_num;
2498 u16 tid;
2499
2500 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2501 return RX_CONTINUE;
2502
2503 if (ieee80211_is_back_req(bar->frame_control)) {
2504 struct {
2505 __le16 control, start_seq_num;
2506 } __packed bar_data;
2507 struct ieee80211_event event = {
2508 .type = BAR_RX_EVENT,
2509 };
2510
2511 if (!rx->sta)
2512 return RX_DROP_MONITOR;
2513
2514 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2515 &bar_data, sizeof(bar_data)))
2516 return RX_DROP_MONITOR;
2517
2518 tid = le16_to_cpu(bar_data.control) >> 12;
2519
2520 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2521 if (!tid_agg_rx)
2522 return RX_DROP_MONITOR;
2523
2524 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2525 event.u.ba.tid = tid;
2526 event.u.ba.ssn = start_seq_num;
2527 event.u.ba.sta = &rx->sta->sta;
2528
2529 /* reset session timer */
2530 if (tid_agg_rx->timeout)
2531 mod_timer(&tid_agg_rx->session_timer,
2532 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2533
2534 spin_lock(&tid_agg_rx->reorder_lock);
2535 /* release stored frames up to start of BAR */
2536 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2537 start_seq_num, frames);
2538 spin_unlock(&tid_agg_rx->reorder_lock);
2539
2540 drv_event_callback(rx->local, rx->sdata, &event);
2541
2542 kfree_skb(skb);
2543 return RX_QUEUED;
2544 }
2545
2546 /*
2547 * After this point, we only want management frames,
2548 * so we can drop all remaining control frames to
2549 * cooked monitor interfaces.
2550 */
2551 return RX_DROP_MONITOR;
2552 }
2553
2554 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2555 struct ieee80211_mgmt *mgmt,
2556 size_t len)
2557 {
2558 struct ieee80211_local *local = sdata->local;
2559 struct sk_buff *skb;
2560 struct ieee80211_mgmt *resp;
2561
2562 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2563 /* Not to own unicast address */
2564 return;
2565 }
2566
2567 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2568 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2569 /* Not from the current AP or not associated yet. */
2570 return;
2571 }
2572
2573 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2574 /* Too short SA Query request frame */
2575 return;
2576 }
2577
2578 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2579 if (skb == NULL)
2580 return;
2581
2582 skb_reserve(skb, local->hw.extra_tx_headroom);
2583 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2584 memset(resp, 0, 24);
2585 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2586 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2587 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2588 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2589 IEEE80211_STYPE_ACTION);
2590 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2591 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2592 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2593 memcpy(resp->u.action.u.sa_query.trans_id,
2594 mgmt->u.action.u.sa_query.trans_id,
2595 WLAN_SA_QUERY_TR_ID_LEN);
2596
2597 ieee80211_tx_skb(sdata, skb);
2598 }
2599
2600 static ieee80211_rx_result debug_noinline
2601 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2602 {
2603 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2604 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2605
2606 /*
2607 * From here on, look only at management frames.
2608 * Data and control frames are already handled,
2609 * and unknown (reserved) frames are useless.
2610 */
2611 if (rx->skb->len < 24)
2612 return RX_DROP_MONITOR;
2613
2614 if (!ieee80211_is_mgmt(mgmt->frame_control))
2615 return RX_DROP_MONITOR;
2616
2617 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2618 ieee80211_is_beacon(mgmt->frame_control) &&
2619 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2620 int sig = 0;
2621
2622 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2623 sig = status->signal;
2624
2625 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2626 rx->skb->data, rx->skb->len,
2627 status->freq, sig);
2628 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2629 }
2630
2631 if (ieee80211_drop_unencrypted_mgmt(rx))
2632 return RX_DROP_UNUSABLE;
2633
2634 return RX_CONTINUE;
2635 }
2636
2637 static ieee80211_rx_result debug_noinline
2638 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2639 {
2640 struct ieee80211_local *local = rx->local;
2641 struct ieee80211_sub_if_data *sdata = rx->sdata;
2642 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2643 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2644 int len = rx->skb->len;
2645
2646 if (!ieee80211_is_action(mgmt->frame_control))
2647 return RX_CONTINUE;
2648
2649 /* drop too small frames */
2650 if (len < IEEE80211_MIN_ACTION_SIZE)
2651 return RX_DROP_UNUSABLE;
2652
2653 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2654 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2655 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2656 return RX_DROP_UNUSABLE;
2657
2658 switch (mgmt->u.action.category) {
2659 case WLAN_CATEGORY_HT:
2660 /* reject HT action frames from stations not supporting HT */
2661 if (!rx->sta->sta.ht_cap.ht_supported)
2662 goto invalid;
2663
2664 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2665 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2666 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2667 sdata->vif.type != NL80211_IFTYPE_AP &&
2668 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2669 break;
2670
2671 /* verify action & smps_control/chanwidth are present */
2672 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2673 goto invalid;
2674
2675 switch (mgmt->u.action.u.ht_smps.action) {
2676 case WLAN_HT_ACTION_SMPS: {
2677 struct ieee80211_supported_band *sband;
2678 enum ieee80211_smps_mode smps_mode;
2679
2680 /* convert to HT capability */
2681 switch (mgmt->u.action.u.ht_smps.smps_control) {
2682 case WLAN_HT_SMPS_CONTROL_DISABLED:
2683 smps_mode = IEEE80211_SMPS_OFF;
2684 break;
2685 case WLAN_HT_SMPS_CONTROL_STATIC:
2686 smps_mode = IEEE80211_SMPS_STATIC;
2687 break;
2688 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2689 smps_mode = IEEE80211_SMPS_DYNAMIC;
2690 break;
2691 default:
2692 goto invalid;
2693 }
2694
2695 /* if no change do nothing */
2696 if (rx->sta->sta.smps_mode == smps_mode)
2697 goto handled;
2698 rx->sta->sta.smps_mode = smps_mode;
2699
2700 sband = rx->local->hw.wiphy->bands[status->band];
2701
2702 rate_control_rate_update(local, sband, rx->sta,
2703 IEEE80211_RC_SMPS_CHANGED);
2704 goto handled;
2705 }
2706 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2707 struct ieee80211_supported_band *sband;
2708 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2709 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
2710
2711 /* If it doesn't support 40 MHz it can't change ... */
2712 if (!(rx->sta->sta.ht_cap.cap &
2713 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2714 goto handled;
2715
2716 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2717 max_bw = IEEE80211_STA_RX_BW_20;
2718 else
2719 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2720
2721 /* set cur_max_bandwidth and recalc sta bw */
2722 rx->sta->cur_max_bandwidth = max_bw;
2723 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2724
2725 if (rx->sta->sta.bandwidth == new_bw)
2726 goto handled;
2727
2728 rx->sta->sta.bandwidth = new_bw;
2729 sband = rx->local->hw.wiphy->bands[status->band];
2730
2731 rate_control_rate_update(local, sband, rx->sta,
2732 IEEE80211_RC_BW_CHANGED);
2733 goto handled;
2734 }
2735 default:
2736 goto invalid;
2737 }
2738
2739 break;
2740 case WLAN_CATEGORY_PUBLIC:
2741 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2742 goto invalid;
2743 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2744 break;
2745 if (!rx->sta)
2746 break;
2747 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2748 break;
2749 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2750 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2751 break;
2752 if (len < offsetof(struct ieee80211_mgmt,
2753 u.action.u.ext_chan_switch.variable))
2754 goto invalid;
2755 goto queue;
2756 case WLAN_CATEGORY_VHT:
2757 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2758 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2759 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2760 sdata->vif.type != NL80211_IFTYPE_AP &&
2761 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2762 break;
2763
2764 /* verify action code is present */
2765 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2766 goto invalid;
2767
2768 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2769 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2770 u8 opmode;
2771
2772 /* verify opmode is present */
2773 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2774 goto invalid;
2775
2776 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2777
2778 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2779 opmode, status->band);
2780 goto handled;
2781 }
2782 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2783 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2784 goto invalid;
2785 goto queue;
2786 }
2787 default:
2788 break;
2789 }
2790 break;
2791 case WLAN_CATEGORY_BACK:
2792 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2793 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2794 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2795 sdata->vif.type != NL80211_IFTYPE_AP &&
2796 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2797 break;
2798
2799 /* verify action_code is present */
2800 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2801 break;
2802
2803 switch (mgmt->u.action.u.addba_req.action_code) {
2804 case WLAN_ACTION_ADDBA_REQ:
2805 if (len < (IEEE80211_MIN_ACTION_SIZE +
2806 sizeof(mgmt->u.action.u.addba_req)))
2807 goto invalid;
2808 break;
2809 case WLAN_ACTION_ADDBA_RESP:
2810 if (len < (IEEE80211_MIN_ACTION_SIZE +
2811 sizeof(mgmt->u.action.u.addba_resp)))
2812 goto invalid;
2813 break;
2814 case WLAN_ACTION_DELBA:
2815 if (len < (IEEE80211_MIN_ACTION_SIZE +
2816 sizeof(mgmt->u.action.u.delba)))
2817 goto invalid;
2818 break;
2819 default:
2820 goto invalid;
2821 }
2822
2823 goto queue;
2824 case WLAN_CATEGORY_SPECTRUM_MGMT:
2825 /* verify action_code is present */
2826 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2827 break;
2828
2829 switch (mgmt->u.action.u.measurement.action_code) {
2830 case WLAN_ACTION_SPCT_MSR_REQ:
2831 if (status->band != IEEE80211_BAND_5GHZ)
2832 break;
2833
2834 if (len < (IEEE80211_MIN_ACTION_SIZE +
2835 sizeof(mgmt->u.action.u.measurement)))
2836 break;
2837
2838 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2839 break;
2840
2841 ieee80211_process_measurement_req(sdata, mgmt, len);
2842 goto handled;
2843 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2844 u8 *bssid;
2845 if (len < (IEEE80211_MIN_ACTION_SIZE +
2846 sizeof(mgmt->u.action.u.chan_switch)))
2847 break;
2848
2849 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2850 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2851 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2852 break;
2853
2854 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2855 bssid = sdata->u.mgd.bssid;
2856 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2857 bssid = sdata->u.ibss.bssid;
2858 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2859 bssid = mgmt->sa;
2860 else
2861 break;
2862
2863 if (!ether_addr_equal(mgmt->bssid, bssid))
2864 break;
2865
2866 goto queue;
2867 }
2868 }
2869 break;
2870 case WLAN_CATEGORY_SA_QUERY:
2871 if (len < (IEEE80211_MIN_ACTION_SIZE +
2872 sizeof(mgmt->u.action.u.sa_query)))
2873 break;
2874
2875 switch (mgmt->u.action.u.sa_query.action) {
2876 case WLAN_ACTION_SA_QUERY_REQUEST:
2877 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2878 break;
2879 ieee80211_process_sa_query_req(sdata, mgmt, len);
2880 goto handled;
2881 }
2882 break;
2883 case WLAN_CATEGORY_SELF_PROTECTED:
2884 if (len < (IEEE80211_MIN_ACTION_SIZE +
2885 sizeof(mgmt->u.action.u.self_prot.action_code)))
2886 break;
2887
2888 switch (mgmt->u.action.u.self_prot.action_code) {
2889 case WLAN_SP_MESH_PEERING_OPEN:
2890 case WLAN_SP_MESH_PEERING_CLOSE:
2891 case WLAN_SP_MESH_PEERING_CONFIRM:
2892 if (!ieee80211_vif_is_mesh(&sdata->vif))
2893 goto invalid;
2894 if (sdata->u.mesh.user_mpm)
2895 /* userspace handles this frame */
2896 break;
2897 goto queue;
2898 case WLAN_SP_MGK_INFORM:
2899 case WLAN_SP_MGK_ACK:
2900 if (!ieee80211_vif_is_mesh(&sdata->vif))
2901 goto invalid;
2902 break;
2903 }
2904 break;
2905 case WLAN_CATEGORY_MESH_ACTION:
2906 if (len < (IEEE80211_MIN_ACTION_SIZE +
2907 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2908 break;
2909
2910 if (!ieee80211_vif_is_mesh(&sdata->vif))
2911 break;
2912 if (mesh_action_is_path_sel(mgmt) &&
2913 !mesh_path_sel_is_hwmp(sdata))
2914 break;
2915 goto queue;
2916 }
2917
2918 return RX_CONTINUE;
2919
2920 invalid:
2921 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2922 /* will return in the next handlers */
2923 return RX_CONTINUE;
2924
2925 handled:
2926 if (rx->sta)
2927 rx->sta->rx_stats.packets++;
2928 dev_kfree_skb(rx->skb);
2929 return RX_QUEUED;
2930
2931 queue:
2932 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2933 skb_queue_tail(&sdata->skb_queue, rx->skb);
2934 ieee80211_queue_work(&local->hw, &sdata->work);
2935 if (rx->sta)
2936 rx->sta->rx_stats.packets++;
2937 return RX_QUEUED;
2938 }
2939
2940 static ieee80211_rx_result debug_noinline
2941 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2942 {
2943 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2944 int sig = 0;
2945
2946 /* skip known-bad action frames and return them in the next handler */
2947 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2948 return RX_CONTINUE;
2949
2950 /*
2951 * Getting here means the kernel doesn't know how to handle
2952 * it, but maybe userspace does ... include returned frames
2953 * so userspace can register for those to know whether ones
2954 * it transmitted were processed or returned.
2955 */
2956
2957 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
2958 sig = status->signal;
2959
2960 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2961 rx->skb->data, rx->skb->len, 0)) {
2962 if (rx->sta)
2963 rx->sta->rx_stats.packets++;
2964 dev_kfree_skb(rx->skb);
2965 return RX_QUEUED;
2966 }
2967
2968 return RX_CONTINUE;
2969 }
2970
2971 static ieee80211_rx_result debug_noinline
2972 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2973 {
2974 struct ieee80211_local *local = rx->local;
2975 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2976 struct sk_buff *nskb;
2977 struct ieee80211_sub_if_data *sdata = rx->sdata;
2978 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2979
2980 if (!ieee80211_is_action(mgmt->frame_control))
2981 return RX_CONTINUE;
2982
2983 /*
2984 * For AP mode, hostapd is responsible for handling any action
2985 * frames that we didn't handle, including returning unknown
2986 * ones. For all other modes we will return them to the sender,
2987 * setting the 0x80 bit in the action category, as required by
2988 * 802.11-2012 9.24.4.
2989 * Newer versions of hostapd shall also use the management frame
2990 * registration mechanisms, but older ones still use cooked
2991 * monitor interfaces so push all frames there.
2992 */
2993 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2994 (sdata->vif.type == NL80211_IFTYPE_AP ||
2995 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2996 return RX_DROP_MONITOR;
2997
2998 if (is_multicast_ether_addr(mgmt->da))
2999 return RX_DROP_MONITOR;
3000
3001 /* do not return rejected action frames */
3002 if (mgmt->u.action.category & 0x80)
3003 return RX_DROP_UNUSABLE;
3004
3005 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3006 GFP_ATOMIC);
3007 if (nskb) {
3008 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
3009
3010 nmgmt->u.action.category |= 0x80;
3011 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3012 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
3013
3014 memset(nskb->cb, 0, sizeof(nskb->cb));
3015
3016 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3017 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3018
3019 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3020 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3021 IEEE80211_TX_CTL_NO_CCK_RATE;
3022 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
3023 info->hw_queue =
3024 local->hw.offchannel_tx_hw_queue;
3025 }
3026
3027 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3028 status->band);
3029 }
3030 dev_kfree_skb(rx->skb);
3031 return RX_QUEUED;
3032 }
3033
3034 static ieee80211_rx_result debug_noinline
3035 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
3036 {
3037 struct ieee80211_sub_if_data *sdata = rx->sdata;
3038 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3039 __le16 stype;
3040
3041 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
3042
3043 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3044 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3045 sdata->vif.type != NL80211_IFTYPE_OCB &&
3046 sdata->vif.type != NL80211_IFTYPE_STATION)
3047 return RX_DROP_MONITOR;
3048
3049 switch (stype) {
3050 case cpu_to_le16(IEEE80211_STYPE_AUTH):
3051 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3052 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3053 /* process for all: mesh, mlme, ibss */
3054 break;
3055 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3056 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
3057 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3058 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
3059 if (is_multicast_ether_addr(mgmt->da) &&
3060 !is_broadcast_ether_addr(mgmt->da))
3061 return RX_DROP_MONITOR;
3062
3063 /* process only for station */
3064 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3065 return RX_DROP_MONITOR;
3066 break;
3067 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
3068 /* process only for ibss and mesh */
3069 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3070 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3071 return RX_DROP_MONITOR;
3072 break;
3073 default:
3074 return RX_DROP_MONITOR;
3075 }
3076
3077 /* queue up frame and kick off work to process it */
3078 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3079 skb_queue_tail(&sdata->skb_queue, rx->skb);
3080 ieee80211_queue_work(&rx->local->hw, &sdata->work);
3081 if (rx->sta)
3082 rx->sta->rx_stats.packets++;
3083
3084 return RX_QUEUED;
3085 }
3086
3087 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3088 struct ieee80211_rate *rate)
3089 {
3090 struct ieee80211_sub_if_data *sdata;
3091 struct ieee80211_local *local = rx->local;
3092 struct sk_buff *skb = rx->skb, *skb2;
3093 struct net_device *prev_dev = NULL;
3094 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3095 int needed_headroom;
3096
3097 /*
3098 * If cooked monitor has been processed already, then
3099 * don't do it again. If not, set the flag.
3100 */
3101 if (rx->flags & IEEE80211_RX_CMNTR)
3102 goto out_free_skb;
3103 rx->flags |= IEEE80211_RX_CMNTR;
3104
3105 /* If there are no cooked monitor interfaces, just free the SKB */
3106 if (!local->cooked_mntrs)
3107 goto out_free_skb;
3108
3109 /* vendor data is long removed here */
3110 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
3111 /* room for the radiotap header based on driver features */
3112 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3113
3114 if (skb_headroom(skb) < needed_headroom &&
3115 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3116 goto out_free_skb;
3117
3118 /* prepend radiotap information */
3119 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3120 false);
3121
3122 skb_reset_mac_header(skb);
3123 skb->ip_summed = CHECKSUM_UNNECESSARY;
3124 skb->pkt_type = PACKET_OTHERHOST;
3125 skb->protocol = htons(ETH_P_802_2);
3126
3127 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3128 if (!ieee80211_sdata_running(sdata))
3129 continue;
3130
3131 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3132 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3133 continue;
3134
3135 if (prev_dev) {
3136 skb2 = skb_clone(skb, GFP_ATOMIC);
3137 if (skb2) {
3138 skb2->dev = prev_dev;
3139 netif_receive_skb(skb2);
3140 }
3141 }
3142
3143 prev_dev = sdata->dev;
3144 ieee80211_rx_stats(sdata->dev, skb->len);
3145 }
3146
3147 if (prev_dev) {
3148 skb->dev = prev_dev;
3149 netif_receive_skb(skb);
3150 return;
3151 }
3152
3153 out_free_skb:
3154 dev_kfree_skb(skb);
3155 }
3156
3157 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3158 ieee80211_rx_result res)
3159 {
3160 switch (res) {
3161 case RX_DROP_MONITOR:
3162 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3163 if (rx->sta)
3164 rx->sta->rx_stats.dropped++;
3165 /* fall through */
3166 case RX_CONTINUE: {
3167 struct ieee80211_rate *rate = NULL;
3168 struct ieee80211_supported_band *sband;
3169 struct ieee80211_rx_status *status;
3170
3171 status = IEEE80211_SKB_RXCB((rx->skb));
3172
3173 sband = rx->local->hw.wiphy->bands[status->band];
3174 if (!(status->flag & RX_FLAG_HT) &&
3175 !(status->flag & RX_FLAG_VHT))
3176 rate = &sband->bitrates[status->rate_idx];
3177
3178 ieee80211_rx_cooked_monitor(rx, rate);
3179 break;
3180 }
3181 case RX_DROP_UNUSABLE:
3182 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3183 if (rx->sta)
3184 rx->sta->rx_stats.dropped++;
3185 dev_kfree_skb(rx->skb);
3186 break;
3187 case RX_QUEUED:
3188 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3189 break;
3190 }
3191 }
3192
3193 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3194 struct sk_buff_head *frames)
3195 {
3196 ieee80211_rx_result res = RX_DROP_MONITOR;
3197 struct sk_buff *skb;
3198
3199 #define CALL_RXH(rxh) \
3200 do { \
3201 res = rxh(rx); \
3202 if (res != RX_CONTINUE) \
3203 goto rxh_next; \
3204 } while (0);
3205
3206 /* Lock here to avoid hitting all of the data used in the RX
3207 * path (e.g. key data, station data, ...) concurrently when
3208 * a frame is released from the reorder buffer due to timeout
3209 * from the timer, potentially concurrently with RX from the
3210 * driver.
3211 */
3212 spin_lock_bh(&rx->local->rx_path_lock);
3213
3214 while ((skb = __skb_dequeue(frames))) {
3215 /*
3216 * all the other fields are valid across frames
3217 * that belong to an aMPDU since they are on the
3218 * same TID from the same station
3219 */
3220 rx->skb = skb;
3221
3222 CALL_RXH(ieee80211_rx_h_check_more_data)
3223 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3224 CALL_RXH(ieee80211_rx_h_sta_process)
3225 CALL_RXH(ieee80211_rx_h_decrypt)
3226 CALL_RXH(ieee80211_rx_h_defragment)
3227 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3228 /* must be after MMIC verify so header is counted in MPDU mic */
3229 #ifdef CONFIG_MAC80211_MESH
3230 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3231 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3232 #endif
3233 CALL_RXH(ieee80211_rx_h_amsdu)
3234 CALL_RXH(ieee80211_rx_h_data)
3235
3236 /* special treatment -- needs the queue */
3237 res = ieee80211_rx_h_ctrl(rx, frames);
3238 if (res != RX_CONTINUE)
3239 goto rxh_next;
3240
3241 CALL_RXH(ieee80211_rx_h_mgmt_check)
3242 CALL_RXH(ieee80211_rx_h_action)
3243 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3244 CALL_RXH(ieee80211_rx_h_action_return)
3245 CALL_RXH(ieee80211_rx_h_mgmt)
3246
3247 rxh_next:
3248 ieee80211_rx_handlers_result(rx, res);
3249
3250 #undef CALL_RXH
3251 }
3252
3253 spin_unlock_bh(&rx->local->rx_path_lock);
3254 }
3255
3256 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3257 {
3258 struct sk_buff_head reorder_release;
3259 ieee80211_rx_result res = RX_DROP_MONITOR;
3260
3261 __skb_queue_head_init(&reorder_release);
3262
3263 #define CALL_RXH(rxh) \
3264 do { \
3265 res = rxh(rx); \
3266 if (res != RX_CONTINUE) \
3267 goto rxh_next; \
3268 } while (0);
3269
3270 CALL_RXH(ieee80211_rx_h_check_dup)
3271 CALL_RXH(ieee80211_rx_h_check)
3272
3273 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3274
3275 ieee80211_rx_handlers(rx, &reorder_release);
3276 return;
3277
3278 rxh_next:
3279 ieee80211_rx_handlers_result(rx, res);
3280
3281 #undef CALL_RXH
3282 }
3283
3284 /*
3285 * This function makes calls into the RX path, therefore
3286 * it has to be invoked under RCU read lock.
3287 */
3288 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3289 {
3290 struct sk_buff_head frames;
3291 struct ieee80211_rx_data rx = {
3292 .sta = sta,
3293 .sdata = sta->sdata,
3294 .local = sta->local,
3295 /* This is OK -- must be QoS data frame */
3296 .security_idx = tid,
3297 .seqno_idx = tid,
3298 .napi = NULL, /* must be NULL to not have races */
3299 };
3300 struct tid_ampdu_rx *tid_agg_rx;
3301
3302 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3303 if (!tid_agg_rx)
3304 return;
3305
3306 __skb_queue_head_init(&frames);
3307
3308 spin_lock(&tid_agg_rx->reorder_lock);
3309 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3310 spin_unlock(&tid_agg_rx->reorder_lock);
3311
3312 if (!skb_queue_empty(&frames)) {
3313 struct ieee80211_event event = {
3314 .type = BA_FRAME_TIMEOUT,
3315 .u.ba.tid = tid,
3316 .u.ba.sta = &sta->sta,
3317 };
3318 drv_event_callback(rx.local, rx.sdata, &event);
3319 }
3320
3321 ieee80211_rx_handlers(&rx, &frames);
3322 }
3323
3324 void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3325 u16 ssn, u64 filtered,
3326 u16 received_mpdus)
3327 {
3328 struct sta_info *sta;
3329 struct tid_ampdu_rx *tid_agg_rx;
3330 struct sk_buff_head frames;
3331 struct ieee80211_rx_data rx = {
3332 /* This is OK -- must be QoS data frame */
3333 .security_idx = tid,
3334 .seqno_idx = tid,
3335 };
3336 int i, diff;
3337
3338 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3339 return;
3340
3341 __skb_queue_head_init(&frames);
3342
3343 sta = container_of(pubsta, struct sta_info, sta);
3344
3345 rx.sta = sta;
3346 rx.sdata = sta->sdata;
3347 rx.local = sta->local;
3348
3349 rcu_read_lock();
3350 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3351 if (!tid_agg_rx)
3352 goto out;
3353
3354 spin_lock_bh(&tid_agg_rx->reorder_lock);
3355
3356 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3357 int release;
3358
3359 /* release all frames in the reorder buffer */
3360 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3361 IEEE80211_SN_MODULO;
3362 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3363 release, &frames);
3364 /* update ssn to match received ssn */
3365 tid_agg_rx->head_seq_num = ssn;
3366 } else {
3367 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3368 &frames);
3369 }
3370
3371 /* handle the case that received ssn is behind the mac ssn.
3372 * it can be tid_agg_rx->buf_size behind and still be valid */
3373 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3374 if (diff >= tid_agg_rx->buf_size) {
3375 tid_agg_rx->reorder_buf_filtered = 0;
3376 goto release;
3377 }
3378 filtered = filtered >> diff;
3379 ssn += diff;
3380
3381 /* update bitmap */
3382 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3383 int index = (ssn + i) % tid_agg_rx->buf_size;
3384
3385 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3386 if (filtered & BIT_ULL(i))
3387 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3388 }
3389
3390 /* now process also frames that the filter marking released */
3391 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3392
3393 release:
3394 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3395
3396 ieee80211_rx_handlers(&rx, &frames);
3397
3398 out:
3399 rcu_read_unlock();
3400 }
3401 EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3402
3403 /* main receive path */
3404
3405 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
3406 {
3407 struct ieee80211_sub_if_data *sdata = rx->sdata;
3408 struct sk_buff *skb = rx->skb;
3409 struct ieee80211_hdr *hdr = (void *)skb->data;
3410 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3411 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3412 int multicast = is_multicast_ether_addr(hdr->addr1);
3413
3414 switch (sdata->vif.type) {
3415 case NL80211_IFTYPE_STATION:
3416 if (!bssid && !sdata->u.mgd.use_4addr)
3417 return false;
3418 if (multicast)
3419 return true;
3420 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3421 case NL80211_IFTYPE_ADHOC:
3422 if (!bssid)
3423 return false;
3424 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3425 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3426 return false;
3427 if (ieee80211_is_beacon(hdr->frame_control))
3428 return true;
3429 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3430 return false;
3431 if (!multicast &&
3432 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3433 return false;
3434 if (!rx->sta) {
3435 int rate_idx;
3436 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3437 rate_idx = 0; /* TODO: HT/VHT rates */
3438 else
3439 rate_idx = status->rate_idx;
3440 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3441 BIT(rate_idx));
3442 }
3443 return true;
3444 case NL80211_IFTYPE_OCB:
3445 if (!bssid)
3446 return false;
3447 if (!ieee80211_is_data_present(hdr->frame_control))
3448 return false;
3449 if (!is_broadcast_ether_addr(bssid))
3450 return false;
3451 if (!multicast &&
3452 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
3453 return false;
3454 if (!rx->sta) {
3455 int rate_idx;
3456 if (status->flag & RX_FLAG_HT)
3457 rate_idx = 0; /* TODO: HT rates */
3458 else
3459 rate_idx = status->rate_idx;
3460 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3461 BIT(rate_idx));
3462 }
3463 return true;
3464 case NL80211_IFTYPE_MESH_POINT:
3465 if (multicast)
3466 return true;
3467 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3468 case NL80211_IFTYPE_AP_VLAN:
3469 case NL80211_IFTYPE_AP:
3470 if (!bssid)
3471 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3472
3473 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3474 /*
3475 * Accept public action frames even when the
3476 * BSSID doesn't match, this is used for P2P
3477 * and location updates. Note that mac80211
3478 * itself never looks at these frames.
3479 */
3480 if (!multicast &&
3481 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3482 return false;
3483 if (ieee80211_is_public_action(hdr, skb->len))
3484 return true;
3485 return ieee80211_is_beacon(hdr->frame_control);
3486 }
3487
3488 if (!ieee80211_has_tods(hdr->frame_control)) {
3489 /* ignore data frames to TDLS-peers */
3490 if (ieee80211_is_data(hdr->frame_control))
3491 return false;
3492 /* ignore action frames to TDLS-peers */
3493 if (ieee80211_is_action(hdr->frame_control) &&
3494 !is_broadcast_ether_addr(bssid) &&
3495 !ether_addr_equal(bssid, hdr->addr1))
3496 return false;
3497 }
3498 return true;
3499 case NL80211_IFTYPE_WDS:
3500 if (bssid || !ieee80211_is_data(hdr->frame_control))
3501 return false;
3502 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
3503 case NL80211_IFTYPE_P2P_DEVICE:
3504 return ieee80211_is_public_action(hdr, skb->len) ||
3505 ieee80211_is_probe_req(hdr->frame_control) ||
3506 ieee80211_is_probe_resp(hdr->frame_control) ||
3507 ieee80211_is_beacon(hdr->frame_control);
3508 default:
3509 break;
3510 }
3511
3512 WARN_ON_ONCE(1);
3513 return false;
3514 }
3515
3516 /*
3517 * This function returns whether or not the SKB
3518 * was destined for RX processing or not, which,
3519 * if consume is true, is equivalent to whether
3520 * or not the skb was consumed.
3521 */
3522 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3523 struct sk_buff *skb, bool consume)
3524 {
3525 struct ieee80211_local *local = rx->local;
3526 struct ieee80211_sub_if_data *sdata = rx->sdata;
3527
3528 rx->skb = skb;
3529
3530 if (!ieee80211_accept_frame(rx))
3531 return false;
3532
3533 if (!consume) {
3534 skb = skb_copy(skb, GFP_ATOMIC);
3535 if (!skb) {
3536 if (net_ratelimit())
3537 wiphy_debug(local->hw.wiphy,
3538 "failed to copy skb for %s\n",
3539 sdata->name);
3540 return true;
3541 }
3542
3543 rx->skb = skb;
3544 }
3545
3546 ieee80211_invoke_rx_handlers(rx);
3547 return true;
3548 }
3549
3550 /*
3551 * This is the actual Rx frames handler. as it belongs to Rx path it must
3552 * be called with rcu_read_lock protection.
3553 */
3554 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3555 struct sk_buff *skb,
3556 struct napi_struct *napi)
3557 {
3558 struct ieee80211_local *local = hw_to_local(hw);
3559 struct ieee80211_sub_if_data *sdata;
3560 struct ieee80211_hdr *hdr;
3561 __le16 fc;
3562 struct ieee80211_rx_data rx;
3563 struct ieee80211_sub_if_data *prev;
3564 struct sta_info *sta, *prev_sta;
3565 struct rhash_head *tmp;
3566 int err = 0;
3567
3568 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3569 memset(&rx, 0, sizeof(rx));
3570 rx.skb = skb;
3571 rx.local = local;
3572 rx.napi = napi;
3573
3574 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3575 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
3576
3577 if (ieee80211_is_mgmt(fc)) {
3578 /* drop frame if too short for header */
3579 if (skb->len < ieee80211_hdrlen(fc))
3580 err = -ENOBUFS;
3581 else
3582 err = skb_linearize(skb);
3583 } else {
3584 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3585 }
3586
3587 if (err) {
3588 dev_kfree_skb(skb);
3589 return;
3590 }
3591
3592 hdr = (struct ieee80211_hdr *)skb->data;
3593 ieee80211_parse_qos(&rx);
3594 ieee80211_verify_alignment(&rx);
3595
3596 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3597 ieee80211_is_beacon(hdr->frame_control)))
3598 ieee80211_scan_rx(local, skb);
3599
3600 if (ieee80211_is_data(fc)) {
3601 const struct bucket_table *tbl;
3602
3603 prev_sta = NULL;
3604
3605 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3606
3607 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
3608 if (!prev_sta) {
3609 prev_sta = sta;
3610 continue;
3611 }
3612
3613 rx.sta = prev_sta;
3614 rx.sdata = prev_sta->sdata;
3615 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3616
3617 prev_sta = sta;
3618 }
3619
3620 if (prev_sta) {
3621 rx.sta = prev_sta;
3622 rx.sdata = prev_sta->sdata;
3623
3624 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3625 return;
3626 goto out;
3627 }
3628 }
3629
3630 prev = NULL;
3631
3632 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3633 if (!ieee80211_sdata_running(sdata))
3634 continue;
3635
3636 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3637 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3638 continue;
3639
3640 /*
3641 * frame is destined for this interface, but if it's
3642 * not also for the previous one we handle that after
3643 * the loop to avoid copying the SKB once too much
3644 */
3645
3646 if (!prev) {
3647 prev = sdata;
3648 continue;
3649 }
3650
3651 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3652 rx.sdata = prev;
3653 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3654
3655 prev = sdata;
3656 }
3657
3658 if (prev) {
3659 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3660 rx.sdata = prev;
3661
3662 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3663 return;
3664 }
3665
3666 out:
3667 dev_kfree_skb(skb);
3668 }
3669
3670 /*
3671 * This is the receive path handler. It is called by a low level driver when an
3672 * 802.11 MPDU is received from the hardware.
3673 */
3674 void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3675 struct napi_struct *napi)
3676 {
3677 struct ieee80211_local *local = hw_to_local(hw);
3678 struct ieee80211_rate *rate = NULL;
3679 struct ieee80211_supported_band *sband;
3680 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3681
3682 WARN_ON_ONCE(softirq_count() == 0);
3683
3684 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3685 goto drop;
3686
3687 sband = local->hw.wiphy->bands[status->band];
3688 if (WARN_ON(!sband))
3689 goto drop;
3690
3691 /*
3692 * If we're suspending, it is possible although not too likely
3693 * that we'd be receiving frames after having already partially
3694 * quiesced the stack. We can't process such frames then since
3695 * that might, for example, cause stations to be added or other
3696 * driver callbacks be invoked.
3697 */
3698 if (unlikely(local->quiescing || local->suspended))
3699 goto drop;
3700
3701 /* We might be during a HW reconfig, prevent Rx for the same reason */
3702 if (unlikely(local->in_reconfig))
3703 goto drop;
3704
3705 /*
3706 * The same happens when we're not even started,
3707 * but that's worth a warning.
3708 */
3709 if (WARN_ON(!local->started))
3710 goto drop;
3711
3712 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3713 /*
3714 * Validate the rate, unless a PLCP error means that
3715 * we probably can't have a valid rate here anyway.
3716 */
3717
3718 if (status->flag & RX_FLAG_HT) {
3719 /*
3720 * rate_idx is MCS index, which can be [0-76]
3721 * as documented on:
3722 *
3723 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3724 *
3725 * Anything else would be some sort of driver or
3726 * hardware error. The driver should catch hardware
3727 * errors.
3728 */
3729 if (WARN(status->rate_idx > 76,
3730 "Rate marked as an HT rate but passed "
3731 "status->rate_idx is not "
3732 "an MCS index [0-76]: %d (0x%02x)\n",
3733 status->rate_idx,
3734 status->rate_idx))
3735 goto drop;
3736 } else if (status->flag & RX_FLAG_VHT) {
3737 if (WARN_ONCE(status->rate_idx > 9 ||
3738 !status->vht_nss ||
3739 status->vht_nss > 8,
3740 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3741 status->rate_idx, status->vht_nss))
3742 goto drop;
3743 } else {
3744 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3745 goto drop;
3746 rate = &sband->bitrates[status->rate_idx];
3747 }
3748 }
3749
3750 status->rx_flags = 0;
3751
3752 /*
3753 * key references and virtual interfaces are protected using RCU
3754 * and this requires that we are in a read-side RCU section during
3755 * receive processing
3756 */
3757 rcu_read_lock();
3758
3759 /*
3760 * Frames with failed FCS/PLCP checksum are not returned,
3761 * all other frames are returned without radiotap header
3762 * if it was previously present.
3763 * Also, frames with less than 16 bytes are dropped.
3764 */
3765 skb = ieee80211_rx_monitor(local, skb, rate);
3766 if (!skb) {
3767 rcu_read_unlock();
3768 return;
3769 }
3770
3771 ieee80211_tpt_led_trig_rx(local,
3772 ((struct ieee80211_hdr *)skb->data)->frame_control,
3773 skb->len);
3774 __ieee80211_rx_handle_packet(hw, skb, napi);
3775
3776 rcu_read_unlock();
3777
3778 return;
3779 drop:
3780 kfree_skb(skb);
3781 }
3782 EXPORT_SYMBOL(ieee80211_rx_napi);
3783
3784 /* This is a version of the rx handler that can be called from hard irq
3785 * context. Post the skb on the queue and schedule the tasklet */
3786 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3787 {
3788 struct ieee80211_local *local = hw_to_local(hw);
3789
3790 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3791
3792 skb->pkt_type = IEEE80211_RX_MSG;
3793 skb_queue_tail(&local->skb_queue, skb);
3794 tasklet_schedule(&local->tasklet);
3795 }
3796 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel stable tree