?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ipv6 sit: work around bogus gcc-8 -Wrestrict warning
[linux/fpc-iii.git] / net / mac80211 / rx.c
blobea3b139875218cc19c0fc776004415cfe3ba469d
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 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/jiffies.h>
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "led.h"
28 #include "mesh.h"
29 #include "wep.h"
30 #include "wpa.h"
31 #include "tkip.h"
32 #include "wme.h"
33 #include "rate.h"
34
35 /*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
42 struct sk_buff *skb)
43 {
44 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
45 if (likely(skb->len > FCS_LEN))
46 __pskb_trim(skb, skb->len - FCS_LEN);
47 else {
48 /* driver bug */
49 WARN_ON(1);
50 dev_kfree_skb(skb);
51 return NULL;
52 }
53 }
54
55 return skb;
56 }
57
58 static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len)
59 {
60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
61 struct ieee80211_hdr *hdr = (void *)skb->data;
62
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
64 RX_FLAG_FAILED_PLCP_CRC |
65 RX_FLAG_AMPDU_IS_ZEROLEN))
66 return true;
67
68 if (unlikely(skb->len < 16 + present_fcs_len))
69 return true;
70
71 if (ieee80211_is_ctl(hdr->frame_control) &&
72 !ieee80211_is_pspoll(hdr->frame_control) &&
73 !ieee80211_is_back_req(hdr->frame_control))
74 return true;
75
76 return false;
77 }
78
79 static int
80 ieee80211_rx_radiotap_space(struct ieee80211_local *local,
81 struct ieee80211_rx_status *status)
82 {
83 int len;
84
85 /* always present fields */
86 len = sizeof(struct ieee80211_radiotap_header) + 8;
87
88 /* allocate extra bitmaps */
89 if (status->chains)
90 len += 4 * hweight8(status->chains);
91
92 if (ieee80211_have_rx_timestamp(status)) {
93 len = ALIGN(len, 8);
94 len += 8;
95 }
96 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
97 len += 1;
98
99 /* antenna field, if we don't have per-chain info */
100 if (!status->chains)
101 len += 1;
102
103 /* padding for RX_FLAGS if necessary */
104 len = ALIGN(len, 2);
105
106 if (status->flag & RX_FLAG_HT) /* HT info */
107 len += 3;
108
109 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
110 len = ALIGN(len, 4);
111 len += 8;
112 }
113
114 if (status->flag & RX_FLAG_VHT) {
115 len = ALIGN(len, 2);
116 len += 12;
117 }
118
119 if (status->chains) {
120 /* antenna and antenna signal fields */
121 len += 2 * hweight8(status->chains);
122 }
123
124 return len;
125 }
126
127 /*
128 * ieee80211_add_rx_radiotap_header - add radiotap header
129 *
130 * add a radiotap header containing all the fields which the hardware provided.
131 */
132 static void
133 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
134 struct sk_buff *skb,
135 struct ieee80211_rate *rate,
136 int rtap_len, bool has_fcs)
137 {
138 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
139 struct ieee80211_radiotap_header *rthdr;
140 unsigned char *pos;
141 __le32 *it_present;
142 u32 it_present_val;
143 u16 rx_flags = 0;
144 u16 channel_flags = 0;
145 int mpdulen, chain;
146 unsigned long chains = status->chains;
147
148 mpdulen = skb->len;
149 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
150 mpdulen += FCS_LEN;
151
152 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
153 memset(rthdr, 0, rtap_len);
154 it_present = &rthdr->it_present;
155
156 /* radiotap header, set always present flags */
157 rthdr->it_len = cpu_to_le16(rtap_len);
158 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
159 BIT(IEEE80211_RADIOTAP_CHANNEL) |
160 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
161
162 if (!status->chains)
163 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
164
165 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
166 it_present_val |=
167 BIT(IEEE80211_RADIOTAP_EXT) |
168 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
169 put_unaligned_le32(it_present_val, it_present);
170 it_present++;
171 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
172 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
173 }
174
175 put_unaligned_le32(it_present_val, it_present);
176
177 pos = (void *)(it_present + 1);
178
179 /* the order of the following fields is important */
180
181 /* IEEE80211_RADIOTAP_TSFT */
182 if (ieee80211_have_rx_timestamp(status)) {
183 /* padding */
184 while ((pos - (u8 *)rthdr) & 7)
185 *pos++ = 0;
186 put_unaligned_le64(
187 ieee80211_calculate_rx_timestamp(local, status,
188 mpdulen, 0),
189 pos);
190 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
191 pos += 8;
192 }
193
194 /* IEEE80211_RADIOTAP_FLAGS */
195 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
196 *pos |= IEEE80211_RADIOTAP_F_FCS;
197 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
198 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
199 if (status->flag & RX_FLAG_SHORTPRE)
200 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
201 pos++;
202
203 /* IEEE80211_RADIOTAP_RATE */
204 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
205 /*
206 * Without rate information don't add it. If we have,
207 * MCS information is a separate field in radiotap,
208 * added below. The byte here is needed as padding
209 * for the channel though, so initialise it to 0.
210 */
211 *pos = 0;
212 } else {
213 int shift = 0;
214 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
215 if (status->flag & RX_FLAG_10MHZ)
216 shift = 1;
217 else if (status->flag & RX_FLAG_5MHZ)
218 shift = 2;
219 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
220 }
221 pos++;
222
223 /* IEEE80211_RADIOTAP_CHANNEL */
224 put_unaligned_le16(status->freq, pos);
225 pos += 2;
226 if (status->flag & RX_FLAG_10MHZ)
227 channel_flags |= IEEE80211_CHAN_HALF;
228 else if (status->flag & RX_FLAG_5MHZ)
229 channel_flags |= IEEE80211_CHAN_QUARTER;
230
231 if (status->band == IEEE80211_BAND_5GHZ)
232 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
233 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
234 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
235 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
236 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
237 else if (rate)
238 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
239 else
240 channel_flags |= IEEE80211_CHAN_2GHZ;
241 put_unaligned_le16(channel_flags, pos);
242 pos += 2;
243
244 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
245 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
246 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
247 *pos = status->signal;
248 rthdr->it_present |=
249 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
250 pos++;
251 }
252
253 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
254
255 if (!status->chains) {
256 /* IEEE80211_RADIOTAP_ANTENNA */
257 *pos = status->antenna;
258 pos++;
259 }
260
261 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
262
263 /* IEEE80211_RADIOTAP_RX_FLAGS */
264 /* ensure 2 byte alignment for the 2 byte field as required */
265 if ((pos - (u8 *)rthdr) & 1)
266 *pos++ = 0;
267 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
268 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
269 put_unaligned_le16(rx_flags, pos);
270 pos += 2;
271
272 if (status->flag & RX_FLAG_HT) {
273 unsigned int stbc;
274
275 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
276 *pos++ = local->hw.radiotap_mcs_details;
277 *pos = 0;
278 if (status->flag & RX_FLAG_SHORT_GI)
279 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
280 if (status->flag & RX_FLAG_40MHZ)
281 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
282 if (status->flag & RX_FLAG_HT_GF)
283 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
284 if (status->flag & RX_FLAG_LDPC)
285 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
286 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
287 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
288 pos++;
289 *pos++ = status->rate_idx;
290 }
291
292 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
293 u16 flags = 0;
294
295 /* ensure 4 byte alignment */
296 while ((pos - (u8 *)rthdr) & 3)
297 pos++;
298 rthdr->it_present |=
299 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
300 put_unaligned_le32(status->ampdu_reference, pos);
301 pos += 4;
302 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
303 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
304 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
305 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
306 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
307 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
308 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
309 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
310 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
311 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
312 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
313 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
314 put_unaligned_le16(flags, pos);
315 pos += 2;
316 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
317 *pos++ = status->ampdu_delimiter_crc;
318 else
319 *pos++ = 0;
320 *pos++ = 0;
321 }
322
323 if (status->flag & RX_FLAG_VHT) {
324 u16 known = local->hw.radiotap_vht_details;
325
326 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
327 /* known field - how to handle 80+80? */
328 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
329 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
330 put_unaligned_le16(known, pos);
331 pos += 2;
332 /* flags */
333 if (status->flag & RX_FLAG_SHORT_GI)
334 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
335 /* in VHT, STBC is binary */
336 if (status->flag & RX_FLAG_STBC_MASK)
337 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
338 if (status->vht_flag & RX_VHT_FLAG_BF)
339 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
340 pos++;
341 /* bandwidth */
342 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
343 *pos++ = 4;
344 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
345 *pos++ = 0; /* marked not known above */
346 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
347 *pos++ = 11;
348 else if (status->flag & RX_FLAG_40MHZ)
349 *pos++ = 1;
350 else /* 20 MHz */
351 *pos++ = 0;
352 /* MCS/NSS */
353 *pos = (status->rate_idx << 4) | status->vht_nss;
354 pos += 4;
355 /* coding field */
356 if (status->flag & RX_FLAG_LDPC)
357 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
358 pos++;
359 /* group ID */
360 pos++;
361 /* partial_aid */
362 pos += 2;
363 }
364
365 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
366 *pos++ = status->chain_signal[chain];
367 *pos++ = chain;
368 }
369 }
370
371 /*
372 * This function copies a received frame to all monitor interfaces and
373 * returns a cleaned-up SKB that no longer includes the FCS nor the
374 * radiotap header the driver might have added.
375 */
376 static struct sk_buff *
377 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
378 struct ieee80211_rate *rate)
379 {
380 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
381 struct ieee80211_sub_if_data *sdata;
382 int needed_headroom;
383 struct sk_buff *skb, *skb2;
384 struct net_device *prev_dev = NULL;
385 int present_fcs_len = 0;
386
387 /*
388 * First, we may need to make a copy of the skb because
389 * (1) we need to modify it for radiotap (if not present), and
390 * (2) the other RX handlers will modify the skb we got.
391 *
392 * We don't need to, of course, if we aren't going to return
393 * the SKB because it has a bad FCS/PLCP checksum.
394 */
395
396 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
397 present_fcs_len = FCS_LEN;
398
399 /* ensure hdr->frame_control is in skb head */
400 if (!pskb_may_pull(origskb, 2)) {
401 dev_kfree_skb(origskb);
402 return NULL;
403 }
404
405 if (!local->monitors) {
406 if (should_drop_frame(origskb, present_fcs_len)) {
407 dev_kfree_skb(origskb);
408 return NULL;
409 }
410
411 return remove_monitor_info(local, origskb);
412 }
413
414 /* room for the radiotap header based on driver features */
415 needed_headroom = ieee80211_rx_radiotap_space(local, status);
416
417 if (should_drop_frame(origskb, present_fcs_len)) {
418 /* only need to expand headroom if necessary */
419 skb = origskb;
420 origskb = NULL;
421
422 /*
423 * This shouldn't trigger often because most devices have an
424 * RX header they pull before we get here, and that should
425 * be big enough for our radiotap information. We should
426 * probably export the length to drivers so that we can have
427 * them allocate enough headroom to start with.
428 */
429 if (skb_headroom(skb) < needed_headroom &&
430 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
431 dev_kfree_skb(skb);
432 return NULL;
433 }
434 } else {
435 /*
436 * Need to make a copy and possibly remove radiotap header
437 * and FCS from the original.
438 */
439 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
440
441 origskb = remove_monitor_info(local, origskb);
442
443 if (!skb)
444 return origskb;
445 }
446
447 /* prepend radiotap information */
448 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
449 true);
450
451 skb_reset_mac_header(skb);
452 skb->ip_summed = CHECKSUM_UNNECESSARY;
453 skb->pkt_type = PACKET_OTHERHOST;
454 skb->protocol = htons(ETH_P_802_2);
455
456 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
457 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
458 continue;
459
460 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
461 continue;
462
463 if (!ieee80211_sdata_running(sdata))
464 continue;
465
466 if (prev_dev) {
467 skb2 = skb_clone(skb, GFP_ATOMIC);
468 if (skb2) {
469 skb2->dev = prev_dev;
470 netif_receive_skb(skb2);
471 }
472 }
473
474 prev_dev = sdata->dev;
475 sdata->dev->stats.rx_packets++;
476 sdata->dev->stats.rx_bytes += skb->len;
477 }
478
479 if (prev_dev) {
480 skb->dev = prev_dev;
481 netif_receive_skb(skb);
482 } else
483 dev_kfree_skb(skb);
484
485 return origskb;
486 }
487
488 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
489 {
490 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
491 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
492 int tid, seqno_idx, security_idx;
493
494 /* does the frame have a qos control field? */
495 if (ieee80211_is_data_qos(hdr->frame_control)) {
496 u8 *qc = ieee80211_get_qos_ctl(hdr);
497 /* frame has qos control */
498 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
499 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
500 status->rx_flags |= IEEE80211_RX_AMSDU;
501
502 seqno_idx = tid;
503 security_idx = tid;
504 } else {
505 /*
506 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
507 *
508 * Sequence numbers for management frames, QoS data
509 * frames with a broadcast/multicast address in the
510 * Address 1 field, and all non-QoS data frames sent
511 * by QoS STAs are assigned using an additional single
512 * modulo-4096 counter, [...]
513 *
514 * We also use that counter for non-QoS STAs.
515 */
516 seqno_idx = IEEE80211_NUM_TIDS;
517 security_idx = 0;
518 if (ieee80211_is_mgmt(hdr->frame_control))
519 security_idx = IEEE80211_NUM_TIDS;
520 tid = 0;
521 }
522
523 rx->seqno_idx = seqno_idx;
524 rx->security_idx = security_idx;
525 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
526 * For now, set skb->priority to 0 for other cases. */
527 rx->skb->priority = (tid > 7) ? 0 : tid;
528 }
529
530 /**
531 * DOC: Packet alignment
532 *
533 * Drivers always need to pass packets that are aligned to two-byte boundaries
534 * to the stack.
535 *
536 * Additionally, should, if possible, align the payload data in a way that
537 * guarantees that the contained IP header is aligned to a four-byte
538 * boundary. In the case of regular frames, this simply means aligning the
539 * payload to a four-byte boundary (because either the IP header is directly
540 * contained, or IV/RFC1042 headers that have a length divisible by four are
541 * in front of it). If the payload data is not properly aligned and the
542 * architecture doesn't support efficient unaligned operations, mac80211
543 * will align the data.
544 *
545 * With A-MSDU frames, however, the payload data address must yield two modulo
546 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
547 * push the IP header further back to a multiple of four again. Thankfully, the
548 * specs were sane enough this time around to require padding each A-MSDU
549 * subframe to a length that is a multiple of four.
550 *
551 * Padding like Atheros hardware adds which is between the 802.11 header and
552 * the payload is not supported, the driver is required to move the 802.11
553 * header to be directly in front of the payload in that case.
554 */
555 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
556 {
557 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
558 WARN_ONCE((unsigned long)rx->skb->data & 1,
559 "unaligned packet at 0x%p\n", rx->skb->data);
560 #endif
561 }
562
563
564 /* rx handlers */
565
566 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
567 {
568 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
569
570 if (is_multicast_ether_addr(hdr->addr1))
571 return 0;
572
573 return ieee80211_is_robust_mgmt_frame(skb);
574 }
575
576
577 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
578 {
579 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
580
581 if (!is_multicast_ether_addr(hdr->addr1))
582 return 0;
583
584 return ieee80211_is_robust_mgmt_frame(skb);
585 }
586
587
588 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
589 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
590 {
591 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
592 struct ieee80211_mmie *mmie;
593
594 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
595 return -1;
596
597 if (!ieee80211_is_robust_mgmt_frame(skb))
598 return -1; /* not a robust management frame */
599
600 mmie = (struct ieee80211_mmie *)
601 (skb->data + skb->len - sizeof(*mmie));
602 if (mmie->element_id != WLAN_EID_MMIE ||
603 mmie->length != sizeof(*mmie) - 2)
604 return -1;
605
606 return le16_to_cpu(mmie->key_id);
607 }
608
609 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
610 struct sk_buff *skb)
611 {
612 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
613 __le16 fc;
614 int hdrlen;
615 u8 keyid;
616
617 fc = hdr->frame_control;
618 hdrlen = ieee80211_hdrlen(fc);
619
620 if (skb->len < hdrlen + cs->hdr_len)
621 return -EINVAL;
622
623 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
624 keyid &= cs->key_idx_mask;
625 keyid >>= cs->key_idx_shift;
626
627 return keyid;
628 }
629
630 static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
631 {
632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
633 char *dev_addr = rx->sdata->vif.addr;
634
635 if (ieee80211_is_data(hdr->frame_control)) {
636 if (is_multicast_ether_addr(hdr->addr1)) {
637 if (ieee80211_has_tods(hdr->frame_control) ||
638 !ieee80211_has_fromds(hdr->frame_control))
639 return RX_DROP_MONITOR;
640 if (ether_addr_equal(hdr->addr3, dev_addr))
641 return RX_DROP_MONITOR;
642 } else {
643 if (!ieee80211_has_a4(hdr->frame_control))
644 return RX_DROP_MONITOR;
645 if (ether_addr_equal(hdr->addr4, dev_addr))
646 return RX_DROP_MONITOR;
647 }
648 }
649
650 /* If there is not an established peer link and this is not a peer link
651 * establisment frame, beacon or probe, drop the frame.
652 */
653
654 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
655 struct ieee80211_mgmt *mgmt;
656
657 if (!ieee80211_is_mgmt(hdr->frame_control))
658 return RX_DROP_MONITOR;
659
660 if (ieee80211_is_action(hdr->frame_control)) {
661 u8 category;
662
663 /* make sure category field is present */
664 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
665 return RX_DROP_MONITOR;
666
667 mgmt = (struct ieee80211_mgmt *)hdr;
668 category = mgmt->u.action.category;
669 if (category != WLAN_CATEGORY_MESH_ACTION &&
670 category != WLAN_CATEGORY_SELF_PROTECTED)
671 return RX_DROP_MONITOR;
672 return RX_CONTINUE;
673 }
674
675 if (ieee80211_is_probe_req(hdr->frame_control) ||
676 ieee80211_is_probe_resp(hdr->frame_control) ||
677 ieee80211_is_beacon(hdr->frame_control) ||
678 ieee80211_is_auth(hdr->frame_control))
679 return RX_CONTINUE;
680
681 return RX_DROP_MONITOR;
682 }
683
684 return RX_CONTINUE;
685 }
686
687 static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
688 struct tid_ampdu_rx *tid_agg_rx,
689 int index,
690 struct sk_buff_head *frames)
691 {
692 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
693 struct sk_buff *skb;
694 struct ieee80211_rx_status *status;
695
696 lockdep_assert_held(&tid_agg_rx->reorder_lock);
697
698 if (skb_queue_empty(skb_list))
699 goto no_frame;
700
701 if (!ieee80211_rx_reorder_ready(skb_list)) {
702 __skb_queue_purge(skb_list);
703 goto no_frame;
704 }
705
706 /* release frames from the reorder ring buffer */
707 tid_agg_rx->stored_mpdu_num--;
708 while ((skb = __skb_dequeue(skb_list))) {
709 status = IEEE80211_SKB_RXCB(skb);
710 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
711 __skb_queue_tail(frames, skb);
712 }
713
714 no_frame:
715 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
716 }
717
718 static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
719 struct tid_ampdu_rx *tid_agg_rx,
720 u16 head_seq_num,
721 struct sk_buff_head *frames)
722 {
723 int index;
724
725 lockdep_assert_held(&tid_agg_rx->reorder_lock);
726
727 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
728 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
729 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
730 frames);
731 }
732 }
733
734 /*
735 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
736 * the skb was added to the buffer longer than this time ago, the earlier
737 * frames that have not yet been received are assumed to be lost and the skb
738 * can be released for processing. This may also release other skb's from the
739 * reorder buffer if there are no additional gaps between the frames.
740 *
741 * Callers must hold tid_agg_rx->reorder_lock.
742 */
743 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
744
745 static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
746 struct tid_ampdu_rx *tid_agg_rx,
747 struct sk_buff_head *frames)
748 {
749 int index, i, j;
750
751 lockdep_assert_held(&tid_agg_rx->reorder_lock);
752
753 /* release the buffer until next missing frame */
754 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
755 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
756 tid_agg_rx->stored_mpdu_num) {
757 /*
758 * No buffers ready to be released, but check whether any
759 * frames in the reorder buffer have timed out.
760 */
761 int skipped = 1;
762 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
763 j = (j + 1) % tid_agg_rx->buf_size) {
764 if (!ieee80211_rx_reorder_ready(
765 &tid_agg_rx->reorder_buf[j])) {
766 skipped++;
767 continue;
768 }
769 if (skipped &&
770 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
771 HT_RX_REORDER_BUF_TIMEOUT))
772 goto set_release_timer;
773
774 /* don't leave incomplete A-MSDUs around */
775 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
776 i = (i + 1) % tid_agg_rx->buf_size)
777 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
778
779 ht_dbg_ratelimited(sdata,
780 "release an RX reorder frame due to timeout on earlier frames\n");
781 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
782 frames);
783
784 /*
785 * Increment the head seq# also for the skipped slots.
786 */
787 tid_agg_rx->head_seq_num =
788 (tid_agg_rx->head_seq_num +
789 skipped) & IEEE80211_SN_MASK;
790 skipped = 0;
791 }
792 } else while (ieee80211_rx_reorder_ready(
793 &tid_agg_rx->reorder_buf[index])) {
794 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
795 frames);
796 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
797 }
798
799 if (tid_agg_rx->stored_mpdu_num) {
800 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
801
802 for (; j != (index - 1) % tid_agg_rx->buf_size;
803 j = (j + 1) % tid_agg_rx->buf_size) {
804 if (ieee80211_rx_reorder_ready(
805 &tid_agg_rx->reorder_buf[j]))
806 break;
807 }
808
809 set_release_timer:
810
811 if (!tid_agg_rx->removed)
812 mod_timer(&tid_agg_rx->reorder_timer,
813 tid_agg_rx->reorder_time[j] + 1 +
814 HT_RX_REORDER_BUF_TIMEOUT);
815 } else {
816 del_timer(&tid_agg_rx->reorder_timer);
817 }
818 }
819
820 /*
821 * As this function belongs to the RX path it must be under
822 * rcu_read_lock protection. It returns false if the frame
823 * can be processed immediately, true if it was consumed.
824 */
825 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
826 struct tid_ampdu_rx *tid_agg_rx,
827 struct sk_buff *skb,
828 struct sk_buff_head *frames)
829 {
830 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
831 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
832 u16 sc = le16_to_cpu(hdr->seq_ctrl);
833 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
834 u16 head_seq_num, buf_size;
835 int index;
836 bool ret = true;
837
838 spin_lock(&tid_agg_rx->reorder_lock);
839
840 /*
841 * Offloaded BA sessions have no known starting sequence number so pick
842 * one from first Rxed frame for this tid after BA was started.
843 */
844 if (unlikely(tid_agg_rx->auto_seq)) {
845 tid_agg_rx->auto_seq = false;
846 tid_agg_rx->ssn = mpdu_seq_num;
847 tid_agg_rx->head_seq_num = mpdu_seq_num;
848 }
849
850 buf_size = tid_agg_rx->buf_size;
851 head_seq_num = tid_agg_rx->head_seq_num;
852
853 /* frame with out of date sequence number */
854 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
855 dev_kfree_skb(skb);
856 goto out;
857 }
858
859 /*
860 * If frame the sequence number exceeds our buffering window
861 * size release some previous frames to make room for this one.
862 */
863 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
864 head_seq_num = ieee80211_sn_inc(
865 ieee80211_sn_sub(mpdu_seq_num, buf_size));
866 /* release stored frames up to new head to stack */
867 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
868 head_seq_num, frames);
869 }
870
871 /* Now the new frame is always in the range of the reordering buffer */
872
873 index = mpdu_seq_num % tid_agg_rx->buf_size;
874
875 /* check if we already stored this frame */
876 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
877 dev_kfree_skb(skb);
878 goto out;
879 }
880
881 /*
882 * If the current MPDU is in the right order and nothing else
883 * is stored we can process it directly, no need to buffer it.
884 * If it is first but there's something stored, we may be able
885 * to release frames after this one.
886 */
887 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
888 tid_agg_rx->stored_mpdu_num == 0) {
889 if (!(status->flag & RX_FLAG_AMSDU_MORE))
890 tid_agg_rx->head_seq_num =
891 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
892 ret = false;
893 goto out;
894 }
895
896 /* put the frame in the reordering buffer */
897 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
898 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
899 tid_agg_rx->reorder_time[index] = jiffies;
900 tid_agg_rx->stored_mpdu_num++;
901 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
902 }
903
904 out:
905 spin_unlock(&tid_agg_rx->reorder_lock);
906 return ret;
907 }
908
909 /*
910 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
911 * true if the MPDU was buffered, false if it should be processed.
912 */
913 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
914 struct sk_buff_head *frames)
915 {
916 struct sk_buff *skb = rx->skb;
917 struct ieee80211_local *local = rx->local;
918 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
919 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
920 struct sta_info *sta = rx->sta;
921 struct tid_ampdu_rx *tid_agg_rx;
922 u16 sc;
923 u8 tid, ack_policy;
924
925 if (!ieee80211_is_data_qos(hdr->frame_control) ||
926 is_multicast_ether_addr(hdr->addr1))
927 goto dont_reorder;
928
929 /*
930 * filter the QoS data rx stream according to
931 * STA/TID and check if this STA/TID is on aggregation
932 */
933
934 if (!sta)
935 goto dont_reorder;
936
937 ack_policy = *ieee80211_get_qos_ctl(hdr) &
938 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
939 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
940
941 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
942 if (!tid_agg_rx)
943 goto dont_reorder;
944
945 /* qos null data frames are excluded */
946 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
947 goto dont_reorder;
948
949 /* not part of a BA session */
950 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
951 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
952 goto dont_reorder;
953
954 /* not actually part of this BA session */
955 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
956 goto dont_reorder;
957
958 /* new, potentially un-ordered, ampdu frame - process it */
959
960 /* reset session timer */
961 if (tid_agg_rx->timeout)
962 tid_agg_rx->last_rx = jiffies;
963
964 /* if this mpdu is fragmented - terminate rx aggregation session */
965 sc = le16_to_cpu(hdr->seq_ctrl);
966 if (sc & IEEE80211_SCTL_FRAG) {
967 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
968 skb_queue_tail(&rx->sdata->skb_queue, skb);
969 ieee80211_queue_work(&local->hw, &rx->sdata->work);
970 return;
971 }
972
973 /*
974 * No locking needed -- we will only ever process one
975 * RX packet at a time, and thus own tid_agg_rx. All
976 * other code manipulating it needs to (and does) make
977 * sure that we cannot get to it any more before doing
978 * anything with it.
979 */
980 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
981 frames))
982 return;
983
984 dont_reorder:
985 __skb_queue_tail(frames, skb);
986 }
987
988 static ieee80211_rx_result debug_noinline
989 ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
990 {
991 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
992 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
993
994 /*
995 * Drop duplicate 802.11 retransmissions
996 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
997 */
998 if (rx->skb->len >= 24 && rx->sta &&
999 !ieee80211_is_ctl(hdr->frame_control) &&
1000 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1001 !is_multicast_ether_addr(hdr->addr1)) {
1002 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1003 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
1004 hdr->seq_ctrl)) {
1005 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
1006 rx->local->dot11FrameDuplicateCount++;
1007 rx->sta->num_duplicates++;
1008 }
1009 return RX_DROP_UNUSABLE;
1010 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1011 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
1012 }
1013 }
1014
1015 if (unlikely(rx->skb->len < 16)) {
1016 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
1017 return RX_DROP_MONITOR;
1018 }
1019
1020 /* Drop disallowed frame classes based on STA auth/assoc state;
1021 * IEEE 802.11, Chap 5.5.
1022 *
1023 * mac80211 filters only based on association state, i.e. it drops
1024 * Class 3 frames from not associated stations. hostapd sends
1025 * deauth/disassoc frames when needed. In addition, hostapd is
1026 * responsible for filtering on both auth and assoc states.
1027 */
1028
1029 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1030 return ieee80211_rx_mesh_check(rx);
1031
1032 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1033 ieee80211_is_pspoll(hdr->frame_control)) &&
1034 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1035 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
1036 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
1037 /*
1038 * accept port control frames from the AP even when it's not
1039 * yet marked ASSOC to prevent a race where we don't set the
1040 * assoc bit quickly enough before it sends the first frame
1041 */
1042 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1043 ieee80211_is_data_present(hdr->frame_control)) {
1044 unsigned int hdrlen;
1045 __be16 ethertype;
1046
1047 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1048
1049 if (rx->skb->len < hdrlen + 8)
1050 return RX_DROP_MONITOR;
1051
1052 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1053 if (ethertype == rx->sdata->control_port_protocol)
1054 return RX_CONTINUE;
1055 }
1056
1057 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1058 cfg80211_rx_spurious_frame(rx->sdata->dev,
1059 hdr->addr2,
1060 GFP_ATOMIC))
1061 return RX_DROP_UNUSABLE;
1062
1063 return RX_DROP_MONITOR;
1064 }
1065
1066 return RX_CONTINUE;
1067 }
1068
1069
1070 static ieee80211_rx_result debug_noinline
1071 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1072 {
1073 struct ieee80211_local *local;
1074 struct ieee80211_hdr *hdr;
1075 struct sk_buff *skb;
1076
1077 local = rx->local;
1078 skb = rx->skb;
1079 hdr = (struct ieee80211_hdr *) skb->data;
1080
1081 if (!local->pspolling)
1082 return RX_CONTINUE;
1083
1084 if (!ieee80211_has_fromds(hdr->frame_control))
1085 /* this is not from AP */
1086 return RX_CONTINUE;
1087
1088 if (!ieee80211_is_data(hdr->frame_control))
1089 return RX_CONTINUE;
1090
1091 if (!ieee80211_has_moredata(hdr->frame_control)) {
1092 /* AP has no more frames buffered for us */
1093 local->pspolling = false;
1094 return RX_CONTINUE;
1095 }
1096
1097 /* more data bit is set, let's request a new frame from the AP */
1098 ieee80211_send_pspoll(local, rx->sdata);
1099
1100 return RX_CONTINUE;
1101 }
1102
1103 static void sta_ps_start(struct sta_info *sta)
1104 {
1105 struct ieee80211_sub_if_data *sdata = sta->sdata;
1106 struct ieee80211_local *local = sdata->local;
1107 struct ps_data *ps;
1108
1109 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1110 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1111 ps = &sdata->bss->ps;
1112 else
1113 return;
1114
1115 atomic_inc(&ps->num_sta_ps);
1116 set_sta_flag(sta, WLAN_STA_PS_STA);
1117 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1118 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
1119 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1120 sta->sta.addr, sta->sta.aid);
1121 }
1122
1123 static void sta_ps_end(struct sta_info *sta)
1124 {
1125 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1126 sta->sta.addr, sta->sta.aid);
1127
1128 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
1129 /*
1130 * Clear the flag only if the other one is still set
1131 * so that the TX path won't start TX'ing new frames
1132 * directly ... In the case that the driver flag isn't
1133 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1134 */
1135 clear_sta_flag(sta, WLAN_STA_PS_STA);
1136 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1137 sta->sta.addr, sta->sta.aid);
1138 return;
1139 }
1140
1141 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1142 clear_sta_flag(sta, WLAN_STA_PS_STA);
1143 ieee80211_sta_ps_deliver_wakeup(sta);
1144 }
1145
1146 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1147 {
1148 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1149 bool in_ps;
1150
1151 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1152
1153 /* Don't let the same PS state be set twice */
1154 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
1155 if ((start && in_ps) || (!start && !in_ps))
1156 return -EINVAL;
1157
1158 if (start)
1159 sta_ps_start(sta_inf);
1160 else
1161 sta_ps_end(sta_inf);
1162
1163 return 0;
1164 }
1165 EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1166
1167 static ieee80211_rx_result debug_noinline
1168 ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1169 {
1170 struct ieee80211_sub_if_data *sdata = rx->sdata;
1171 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1172 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1173 int tid, ac;
1174
1175 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1176 return RX_CONTINUE;
1177
1178 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1179 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1180 return RX_CONTINUE;
1181
1182 /*
1183 * The device handles station powersave, so don't do anything about
1184 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1185 * it to mac80211 since they're handled.)
1186 */
1187 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1188 return RX_CONTINUE;
1189
1190 /*
1191 * Don't do anything if the station isn't already asleep. In
1192 * the uAPSD case, the station will probably be marked asleep,
1193 * in the PS-Poll case the station must be confused ...
1194 */
1195 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
1196 return RX_CONTINUE;
1197
1198 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
1199 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1200 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1201 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1202 else
1203 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
1204 }
1205
1206 /* Free PS Poll skb here instead of returning RX_DROP that would
1207 * count as an dropped frame. */
1208 dev_kfree_skb(rx->skb);
1209
1210 return RX_QUEUED;
1211 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1212 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1213 ieee80211_has_pm(hdr->frame_control) &&
1214 (ieee80211_is_data_qos(hdr->frame_control) ||
1215 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1216 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1217 ac = ieee802_1d_to_ac[tid & 7];
1218
1219 /*
1220 * If this AC is not trigger-enabled do nothing.
1221 *
1222 * NB: This could/should check a separate bitmap of trigger-
1223 * enabled queues, but for now we only implement uAPSD w/o
1224 * TSPEC changes to the ACs, so they're always the same.
1225 */
1226 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1227 return RX_CONTINUE;
1228
1229 /* if we are in a service period, do nothing */
1230 if (test_sta_flag(rx->sta, WLAN_STA_SP))
1231 return RX_CONTINUE;
1232
1233 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
1234 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1235 else
1236 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
1237 }
1238
1239 return RX_CONTINUE;
1240 }
1241
1242 static ieee80211_rx_result debug_noinline
1243 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
1244 {
1245 struct sta_info *sta = rx->sta;
1246 struct sk_buff *skb = rx->skb;
1247 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1248 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1249 int i;
1250
1251 if (!sta)
1252 return RX_CONTINUE;
1253
1254 /*
1255 * Update last_rx only for IBSS packets which are for the current
1256 * BSSID and for station already AUTHORIZED to avoid keeping the
1257 * current IBSS network alive in cases where other STAs start
1258 * using different BSSID. This will also give the station another
1259 * chance to restart the authentication/authorization in case
1260 * something went wrong the first time.
1261 */
1262 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1263 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1264 NL80211_IFTYPE_ADHOC);
1265 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1266 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
1267 sta->last_rx = jiffies;
1268 if (ieee80211_is_data(hdr->frame_control) &&
1269 !is_multicast_ether_addr(hdr->addr1)) {
1270 sta->last_rx_rate_idx = status->rate_idx;
1271 sta->last_rx_rate_flag = status->flag;
1272 sta->last_rx_rate_vht_flag = status->vht_flag;
1273 sta->last_rx_rate_vht_nss = status->vht_nss;
1274 }
1275 }
1276 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1277 /*
1278 * Mesh beacons will update last_rx when if they are found to
1279 * match the current local configuration when processed.
1280 */
1281 sta->last_rx = jiffies;
1282 if (ieee80211_is_data(hdr->frame_control)) {
1283 sta->last_rx_rate_idx = status->rate_idx;
1284 sta->last_rx_rate_flag = status->flag;
1285 sta->last_rx_rate_vht_flag = status->vht_flag;
1286 sta->last_rx_rate_vht_nss = status->vht_nss;
1287 }
1288 }
1289
1290 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1291 return RX_CONTINUE;
1292
1293 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1294 ieee80211_sta_rx_notify(rx->sdata, hdr);
1295
1296 sta->rx_fragments++;
1297 sta->rx_bytes += rx->skb->len;
1298 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1299 sta->last_signal = status->signal;
1300 ewma_add(&sta->avg_signal, -status->signal);
1301 }
1302
1303 if (status->chains) {
1304 sta->chains = status->chains;
1305 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1306 int signal = status->chain_signal[i];
1307
1308 if (!(status->chains & BIT(i)))
1309 continue;
1310
1311 sta->chain_signal_last[i] = signal;
1312 ewma_add(&sta->chain_signal_avg[i], -signal);
1313 }
1314 }
1315
1316 /*
1317 * Change STA power saving mode only at the end of a frame
1318 * exchange sequence.
1319 */
1320 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1321 !ieee80211_has_morefrags(hdr->frame_control) &&
1322 !ieee80211_is_back_req(hdr->frame_control) &&
1323 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1324 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1325 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1326 /*
1327 * PM bit is only checked in frames where it isn't reserved,
1328 * in AP mode it's reserved in non-bufferable management frames
1329 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1330 * BAR frames should be ignored as specified in
1331 * IEEE 802.11-2012 10.2.1.2.
1332 */
1333 (!ieee80211_is_mgmt(hdr->frame_control) ||
1334 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
1335 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1336 if (!ieee80211_has_pm(hdr->frame_control))
1337 sta_ps_end(sta);
1338 } else {
1339 if (ieee80211_has_pm(hdr->frame_control))
1340 sta_ps_start(sta);
1341 }
1342 }
1343
1344 /* mesh power save support */
1345 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1346 ieee80211_mps_rx_h_sta_process(sta, hdr);
1347
1348 /*
1349 * Drop (qos-)data::nullfunc frames silently, since they
1350 * are used only to control station power saving mode.
1351 */
1352 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1353 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
1354 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
1355
1356 /*
1357 * If we receive a 4-addr nullfunc frame from a STA
1358 * that was not moved to a 4-addr STA vlan yet send
1359 * the event to userspace and for older hostapd drop
1360 * the frame to the monitor interface.
1361 */
1362 if (ieee80211_has_a4(hdr->frame_control) &&
1363 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1364 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1365 !rx->sdata->u.vlan.sta))) {
1366 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1367 cfg80211_rx_unexpected_4addr_frame(
1368 rx->sdata->dev, sta->sta.addr,
1369 GFP_ATOMIC);
1370 return RX_DROP_MONITOR;
1371 }
1372 /*
1373 * Update counter and free packet here to avoid
1374 * counting this as a dropped packed.
1375 */
1376 sta->rx_packets++;
1377 dev_kfree_skb(rx->skb);
1378 return RX_QUEUED;
1379 }
1380
1381 return RX_CONTINUE;
1382 } /* ieee80211_rx_h_sta_process */
1383
1384 static ieee80211_rx_result debug_noinline
1385 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1386 {
1387 struct sk_buff *skb = rx->skb;
1388 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1389 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1390 int keyidx;
1391 int hdrlen;
1392 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1393 struct ieee80211_key *sta_ptk = NULL;
1394 int mmie_keyidx = -1;
1395 __le16 fc;
1396 const struct ieee80211_cipher_scheme *cs = NULL;
1397
1398 /*
1399 * Key selection 101
1400 *
1401 * There are four types of keys:
1402 * - GTK (group keys)
1403 * - IGTK (group keys for management frames)
1404 * - PTK (pairwise keys)
1405 * - STK (station-to-station pairwise keys)
1406 *
1407 * When selecting a key, we have to distinguish between multicast
1408 * (including broadcast) and unicast frames, the latter can only
1409 * use PTKs and STKs while the former always use GTKs and IGTKs.
1410 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1411 * unicast frames can also use key indices like GTKs. Hence, if we
1412 * don't have a PTK/STK we check the key index for a WEP key.
1413 *
1414 * Note that in a regular BSS, multicast frames are sent by the
1415 * AP only, associated stations unicast the frame to the AP first
1416 * which then multicasts it on their behalf.
1417 *
1418 * There is also a slight problem in IBSS mode: GTKs are negotiated
1419 * with each station, that is something we don't currently handle.
1420 * The spec seems to expect that one negotiates the same key with
1421 * every station but there's no such requirement; VLANs could be
1422 * possible.
1423 */
1424
1425 /*
1426 * No point in finding a key and decrypting if the frame is neither
1427 * addressed to us nor a multicast frame.
1428 */
1429 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1430 return RX_CONTINUE;
1431
1432 /* start without a key */
1433 rx->key = NULL;
1434 fc = hdr->frame_control;
1435
1436 if (rx->sta) {
1437 int keyid = rx->sta->ptk_idx;
1438
1439 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1440 cs = rx->sta->cipher_scheme;
1441 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1442 if (unlikely(keyid < 0))
1443 return RX_DROP_UNUSABLE;
1444 }
1445 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1446 }
1447
1448 if (!ieee80211_has_protected(fc))
1449 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1450
1451 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1452 rx->key = sta_ptk;
1453 if ((status->flag & RX_FLAG_DECRYPTED) &&
1454 (status->flag & RX_FLAG_IV_STRIPPED))
1455 return RX_CONTINUE;
1456 /* Skip decryption if the frame is not protected. */
1457 if (!ieee80211_has_protected(fc))
1458 return RX_CONTINUE;
1459 } else if (mmie_keyidx >= 0) {
1460 /* Broadcast/multicast robust management frame / BIP */
1461 if ((status->flag & RX_FLAG_DECRYPTED) &&
1462 (status->flag & RX_FLAG_IV_STRIPPED))
1463 return RX_CONTINUE;
1464
1465 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1466 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1467 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1468 if (rx->sta)
1469 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1470 if (!rx->key)
1471 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1472 } else if (!ieee80211_has_protected(fc)) {
1473 /*
1474 * The frame was not protected, so skip decryption. However, we
1475 * need to set rx->key if there is a key that could have been
1476 * used so that the frame may be dropped if encryption would
1477 * have been expected.
1478 */
1479 struct ieee80211_key *key = NULL;
1480 struct ieee80211_sub_if_data *sdata = rx->sdata;
1481 int i;
1482
1483 if (ieee80211_is_mgmt(fc) &&
1484 is_multicast_ether_addr(hdr->addr1) &&
1485 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1486 rx->key = key;
1487 else {
1488 if (rx->sta) {
1489 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1490 key = rcu_dereference(rx->sta->gtk[i]);
1491 if (key)
1492 break;
1493 }
1494 }
1495 if (!key) {
1496 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1497 key = rcu_dereference(sdata->keys[i]);
1498 if (key)
1499 break;
1500 }
1501 }
1502 if (key)
1503 rx->key = key;
1504 }
1505 return RX_CONTINUE;
1506 } else {
1507 u8 keyid;
1508
1509 /*
1510 * The device doesn't give us the IV so we won't be
1511 * able to look up the key. That's ok though, we
1512 * don't need to decrypt the frame, we just won't
1513 * be able to keep statistics accurate.
1514 * Except for key threshold notifications, should
1515 * we somehow allow the driver to tell us which key
1516 * the hardware used if this flag is set?
1517 */
1518 if ((status->flag & RX_FLAG_DECRYPTED) &&
1519 (status->flag & RX_FLAG_IV_STRIPPED))
1520 return RX_CONTINUE;
1521
1522 hdrlen = ieee80211_hdrlen(fc);
1523
1524 if (cs) {
1525 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
1526
1527 if (unlikely(keyidx < 0))
1528 return RX_DROP_UNUSABLE;
1529 } else {
1530 if (rx->skb->len < 8 + hdrlen)
1531 return RX_DROP_UNUSABLE; /* TODO: count this? */
1532 /*
1533 * no need to call ieee80211_wep_get_keyidx,
1534 * it verifies a bunch of things we've done already
1535 */
1536 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1537 keyidx = keyid >> 6;
1538 }
1539
1540 /* check per-station GTK first, if multicast packet */
1541 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1542 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1543
1544 /* if not found, try default key */
1545 if (!rx->key) {
1546 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1547
1548 /*
1549 * RSNA-protected unicast frames should always be
1550 * sent with pairwise or station-to-station keys,
1551 * but for WEP we allow using a key index as well.
1552 */
1553 if (rx->key &&
1554 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1555 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1556 !is_multicast_ether_addr(hdr->addr1))
1557 rx->key = NULL;
1558 }
1559 }
1560
1561 if (rx->key) {
1562 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1563 return RX_DROP_MONITOR;
1564
1565 rx->key->tx_rx_count++;
1566 /* TODO: add threshold stuff again */
1567 } else {
1568 return RX_DROP_MONITOR;
1569 }
1570
1571 switch (rx->key->conf.cipher) {
1572 case WLAN_CIPHER_SUITE_WEP40:
1573 case WLAN_CIPHER_SUITE_WEP104:
1574 result = ieee80211_crypto_wep_decrypt(rx);
1575 break;
1576 case WLAN_CIPHER_SUITE_TKIP:
1577 result = ieee80211_crypto_tkip_decrypt(rx);
1578 break;
1579 case WLAN_CIPHER_SUITE_CCMP:
1580 result = ieee80211_crypto_ccmp_decrypt(rx);
1581 break;
1582 case WLAN_CIPHER_SUITE_AES_CMAC:
1583 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1584 break;
1585 default:
1586 result = ieee80211_crypto_hw_decrypt(rx);
1587 }
1588
1589 /* the hdr variable is invalid after the decrypt handlers */
1590
1591 /* either the frame has been decrypted or will be dropped */
1592 status->flag |= RX_FLAG_DECRYPTED;
1593
1594 return result;
1595 }
1596
1597 static inline struct ieee80211_fragment_entry *
1598 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1599 unsigned int frag, unsigned int seq, int rx_queue,
1600 struct sk_buff **skb)
1601 {
1602 struct ieee80211_fragment_entry *entry;
1603
1604 entry = &sdata->fragments[sdata->fragment_next++];
1605 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1606 sdata->fragment_next = 0;
1607
1608 if (!skb_queue_empty(&entry->skb_list))
1609 __skb_queue_purge(&entry->skb_list);
1610
1611 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1612 *skb = NULL;
1613 entry->first_frag_time = jiffies;
1614 entry->seq = seq;
1615 entry->rx_queue = rx_queue;
1616 entry->last_frag = frag;
1617 entry->ccmp = 0;
1618 entry->extra_len = 0;
1619
1620 return entry;
1621 }
1622
1623 static inline struct ieee80211_fragment_entry *
1624 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
1625 unsigned int frag, unsigned int seq,
1626 int rx_queue, struct ieee80211_hdr *hdr)
1627 {
1628 struct ieee80211_fragment_entry *entry;
1629 int i, idx;
1630
1631 idx = sdata->fragment_next;
1632 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1633 struct ieee80211_hdr *f_hdr;
1634
1635 idx--;
1636 if (idx < 0)
1637 idx = IEEE80211_FRAGMENT_MAX - 1;
1638
1639 entry = &sdata->fragments[idx];
1640 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1641 entry->rx_queue != rx_queue ||
1642 entry->last_frag + 1 != frag)
1643 continue;
1644
1645 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
1646
1647 /*
1648 * Check ftype and addresses are equal, else check next fragment
1649 */
1650 if (((hdr->frame_control ^ f_hdr->frame_control) &
1651 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
1652 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1653 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
1654 continue;
1655
1656 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
1657 __skb_queue_purge(&entry->skb_list);
1658 continue;
1659 }
1660 return entry;
1661 }
1662
1663 return NULL;
1664 }
1665
1666 static ieee80211_rx_result debug_noinline
1667 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
1668 {
1669 struct ieee80211_hdr *hdr;
1670 u16 sc;
1671 __le16 fc;
1672 unsigned int frag, seq;
1673 struct ieee80211_fragment_entry *entry;
1674 struct sk_buff *skb;
1675 struct ieee80211_rx_status *status;
1676
1677 hdr = (struct ieee80211_hdr *)rx->skb->data;
1678 fc = hdr->frame_control;
1679
1680 if (ieee80211_is_ctl(fc))
1681 return RX_CONTINUE;
1682
1683 sc = le16_to_cpu(hdr->seq_ctrl);
1684 frag = sc & IEEE80211_SCTL_FRAG;
1685
1686 if (is_multicast_ether_addr(hdr->addr1)) {
1687 rx->local->dot11MulticastReceivedFrameCount++;
1688 goto out_no_led;
1689 }
1690
1691 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1692 goto out;
1693
1694 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1695
1696 if (skb_linearize(rx->skb))
1697 return RX_DROP_UNUSABLE;
1698
1699 /*
1700 * skb_linearize() might change the skb->data and
1701 * previously cached variables (in this case, hdr) need to
1702 * be refreshed with the new data.
1703 */
1704 hdr = (struct ieee80211_hdr *)rx->skb->data;
1705 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1706
1707 if (frag == 0) {
1708 /* This is the first fragment of a new frame. */
1709 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
1710 rx->seqno_idx, &(rx->skb));
1711 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
1712 ieee80211_has_protected(fc)) {
1713 int queue = rx->security_idx;
1714 /* Store CCMP PN so that we can verify that the next
1715 * fragment has a sequential PN value. */
1716 entry->ccmp = 1;
1717 memcpy(entry->last_pn,
1718 rx->key->u.ccmp.rx_pn[queue],
1719 IEEE80211_CCMP_PN_LEN);
1720 }
1721 return RX_QUEUED;
1722 }
1723
1724 /* This is a fragment for a frame that should already be pending in
1725 * fragment cache. Add this fragment to the end of the pending entry.
1726 */
1727 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1728 rx->seqno_idx, hdr);
1729 if (!entry) {
1730 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1731 return RX_DROP_MONITOR;
1732 }
1733
1734 /* Verify that MPDUs within one MSDU have sequential PN values.
1735 * (IEEE 802.11i, 8.3.3.4.5) */
1736 if (entry->ccmp) {
1737 int i;
1738 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
1739 int queue;
1740 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
1741 return RX_DROP_UNUSABLE;
1742 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1743 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
1744 pn[i]++;
1745 if (pn[i])
1746 break;
1747 }
1748 queue = rx->security_idx;
1749 rpn = rx->key->u.ccmp.rx_pn[queue];
1750 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
1751 return RX_DROP_UNUSABLE;
1752 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
1753 }
1754
1755 skb_pull(rx->skb, ieee80211_hdrlen(fc));
1756 __skb_queue_tail(&entry->skb_list, rx->skb);
1757 entry->last_frag = frag;
1758 entry->extra_len += rx->skb->len;
1759 if (ieee80211_has_morefrags(fc)) {
1760 rx->skb = NULL;
1761 return RX_QUEUED;
1762 }
1763
1764 rx->skb = __skb_dequeue(&entry->skb_list);
1765 if (skb_tailroom(rx->skb) < entry->extra_len) {
1766 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1767 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1768 GFP_ATOMIC))) {
1769 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1770 __skb_queue_purge(&entry->skb_list);
1771 return RX_DROP_UNUSABLE;
1772 }
1773 }
1774 while ((skb = __skb_dequeue(&entry->skb_list))) {
1775 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1776 dev_kfree_skb(skb);
1777 }
1778
1779 /* Complete frame has been reassembled - process it now */
1780 status = IEEE80211_SKB_RXCB(rx->skb);
1781 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
1782
1783 out:
1784 ieee80211_led_rx(rx->local);
1785 out_no_led:
1786 if (rx->sta)
1787 rx->sta->rx_packets++;
1788 return RX_CONTINUE;
1789 }
1790
1791 static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
1792 {
1793 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
1794 return -EACCES;
1795
1796 return 0;
1797 }
1798
1799 static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
1800 {
1801 struct sk_buff *skb = rx->skb;
1802 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1803
1804 /*
1805 * Pass through unencrypted frames if the hardware has
1806 * decrypted them already.
1807 */
1808 if (status->flag & RX_FLAG_DECRYPTED)
1809 return 0;
1810
1811 /* Drop unencrypted frames if key is set. */
1812 if (unlikely(!ieee80211_has_protected(fc) &&
1813 !ieee80211_is_nullfunc(fc) &&
1814 ieee80211_is_data(fc) &&
1815 (rx->key || rx->sdata->drop_unencrypted)))
1816 return -EACCES;
1817
1818 return 0;
1819 }
1820
1821 static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1822 {
1823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1825 __le16 fc = hdr->frame_control;
1826
1827 /*
1828 * Pass through unencrypted frames if the hardware has
1829 * decrypted them already.
1830 */
1831 if (status->flag & RX_FLAG_DECRYPTED)
1832 return 0;
1833
1834 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
1835 if (unlikely(!ieee80211_has_protected(fc) &&
1836 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1837 rx->key)) {
1838 if (ieee80211_is_deauth(fc) ||
1839 ieee80211_is_disassoc(fc))
1840 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1841 rx->skb->data,
1842 rx->skb->len);
1843 return -EACCES;
1844 }
1845 /* BIP does not use Protected field, so need to check MMIE */
1846 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
1847 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1848 if (ieee80211_is_deauth(fc) ||
1849 ieee80211_is_disassoc(fc))
1850 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1851 rx->skb->data,
1852 rx->skb->len);
1853 return -EACCES;
1854 }
1855 /*
1856 * When using MFP, Action frames are not allowed prior to
1857 * having configured keys.
1858 */
1859 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1860 ieee80211_is_robust_mgmt_frame(rx->skb)))
1861 return -EACCES;
1862 }
1863
1864 return 0;
1865 }
1866
1867 static int
1868 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
1869 {
1870 struct ieee80211_sub_if_data *sdata = rx->sdata;
1871 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1872 bool check_port_control = false;
1873 struct ethhdr *ehdr;
1874 int ret;
1875
1876 *port_control = false;
1877 if (ieee80211_has_a4(hdr->frame_control) &&
1878 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
1879 return -1;
1880
1881 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1882 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1883
1884 if (!sdata->u.mgd.use_4addr)
1885 return -1;
1886 else
1887 check_port_control = true;
1888 }
1889
1890 if (is_multicast_ether_addr(hdr->addr1) &&
1891 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
1892 return -1;
1893
1894 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1895 if (ret < 0)
1896 return ret;
1897
1898 ehdr = (struct ethhdr *) rx->skb->data;
1899 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1900 *port_control = true;
1901 else if (check_port_control)
1902 return -1;
1903
1904 return 0;
1905 }
1906
1907 /*
1908 * requires that rx->skb is a frame with ethernet header
1909 */
1910 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
1911 {
1912 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
1913 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1914 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1915
1916 /*
1917 * Allow EAPOL frames to us/the PAE group address regardless
1918 * of whether the frame was encrypted or not.
1919 */
1920 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
1921 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1922 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
1923 return true;
1924
1925 if (ieee80211_802_1x_port_control(rx) ||
1926 ieee80211_drop_unencrypted(rx, fc))
1927 return false;
1928
1929 return true;
1930 }
1931
1932 /*
1933 * requires that rx->skb is a frame with ethernet header
1934 */
1935 static void
1936 ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
1937 {
1938 struct ieee80211_sub_if_data *sdata = rx->sdata;
1939 struct net_device *dev = sdata->dev;
1940 struct sk_buff *skb, *xmit_skb;
1941 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1942 struct sta_info *dsta;
1943 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1944
1945 skb = rx->skb;
1946 xmit_skb = NULL;
1947
1948 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1949 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1950 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
1951 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
1952 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
1953 if (is_multicast_ether_addr(ehdr->h_dest)) {
1954 /*
1955 * send multicast frames both to higher layers in
1956 * local net stack and back to the wireless medium
1957 */
1958 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1959 if (!xmit_skb)
1960 net_info_ratelimited("%s: failed to clone multicast frame\n",
1961 dev->name);
1962 } else {
1963 dsta = sta_info_get(sdata, skb->data);
1964 if (dsta) {
1965 /*
1966 * The destination station is associated to
1967 * this AP (in this VLAN), so send the frame
1968 * directly to it and do not pass it to local
1969 * net stack.
1970 */
1971 xmit_skb = skb;
1972 skb = NULL;
1973 }
1974 }
1975 }
1976
1977 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1978 if (skb) {
1979 /* 'align' will only take the values 0 or 2 here since all
1980 * frames are required to be aligned to 2-byte boundaries
1981 * when being passed to mac80211; the code here works just
1982 * as well if that isn't true, but mac80211 assumes it can
1983 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
1984 */
1985 int align;
1986
1987 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
1988 if (align) {
1989 if (WARN_ON(skb_headroom(skb) < 3)) {
1990 dev_kfree_skb(skb);
1991 skb = NULL;
1992 } else {
1993 u8 *data = skb->data;
1994 size_t len = skb_headlen(skb);
1995 skb->data -= align;
1996 memmove(skb->data, data, len);
1997 skb_set_tail_pointer(skb, len);
1998 }
1999 }
2000 }
2001 #endif
2002
2003 if (skb) {
2004 /* deliver to local stack */
2005 skb->protocol = eth_type_trans(skb, dev);
2006 memset(skb->cb, 0, sizeof(skb->cb));
2007 if (!(rx->flags & IEEE80211_RX_REORDER_TIMER) &&
2008 rx->local->napi)
2009 napi_gro_receive(rx->local->napi, skb);
2010 else
2011 netif_receive_skb(skb);
2012 }
2013
2014 if (xmit_skb) {
2015 /*
2016 * Send to wireless media and increase priority by 256 to
2017 * keep the received priority instead of reclassifying
2018 * the frame (see cfg80211_classify8021d).
2019 */
2020 xmit_skb->priority += 256;
2021 xmit_skb->protocol = htons(ETH_P_802_3);
2022 skb_reset_network_header(xmit_skb);
2023 skb_reset_mac_header(xmit_skb);
2024 dev_queue_xmit(xmit_skb);
2025 }
2026 }
2027
2028 static ieee80211_rx_result debug_noinline
2029 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2030 {
2031 struct net_device *dev = rx->sdata->dev;
2032 struct sk_buff *skb = rx->skb;
2033 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2034 __le16 fc = hdr->frame_control;
2035 struct sk_buff_head frame_list;
2036 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2037
2038 if (unlikely(!ieee80211_is_data(fc)))
2039 return RX_CONTINUE;
2040
2041 if (unlikely(!ieee80211_is_data_present(fc)))
2042 return RX_DROP_MONITOR;
2043
2044 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2045 return RX_CONTINUE;
2046
2047 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2048 switch (rx->sdata->vif.type) {
2049 case NL80211_IFTYPE_AP_VLAN:
2050 if (!rx->sdata->u.vlan.sta)
2051 return RX_DROP_UNUSABLE;
2052 break;
2053 case NL80211_IFTYPE_STATION:
2054 if (!rx->sdata->u.mgd.use_4addr)
2055 return RX_DROP_UNUSABLE;
2056 break;
2057 default:
2058 return RX_DROP_UNUSABLE;
2059 }
2060 }
2061
2062 if (is_multicast_ether_addr(hdr->addr1))
2063 return RX_DROP_UNUSABLE;
2064
2065 skb->dev = dev;
2066 __skb_queue_head_init(&frame_list);
2067
2068 if (skb_linearize(skb))
2069 return RX_DROP_UNUSABLE;
2070
2071 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2072 rx->sdata->vif.type,
2073 rx->local->hw.extra_tx_headroom, true);
2074
2075 while (!skb_queue_empty(&frame_list)) {
2076 rx->skb = __skb_dequeue(&frame_list);
2077
2078 if (!ieee80211_frame_allowed(rx, fc)) {
2079 dev_kfree_skb(rx->skb);
2080 continue;
2081 }
2082 dev->stats.rx_packets++;
2083 dev->stats.rx_bytes += rx->skb->len;
2084
2085 ieee80211_deliver_skb(rx);
2086 }
2087
2088 return RX_QUEUED;
2089 }
2090
2091 #ifdef CONFIG_MAC80211_MESH
2092 static ieee80211_rx_result
2093 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2094 {
2095 struct ieee80211_hdr *fwd_hdr, *hdr;
2096 struct ieee80211_tx_info *info;
2097 struct ieee80211s_hdr *mesh_hdr;
2098 struct sk_buff *skb = rx->skb, *fwd_skb;
2099 struct ieee80211_local *local = rx->local;
2100 struct ieee80211_sub_if_data *sdata = rx->sdata;
2101 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2102 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2103 u16 ac, q, hdrlen;
2104
2105 hdr = (struct ieee80211_hdr *) skb->data;
2106 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2107
2108 /* make sure fixed part of mesh header is there, also checks skb len */
2109 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2110 return RX_DROP_MONITOR;
2111
2112 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2113
2114 /* make sure full mesh header is there, also checks skb len */
2115 if (!pskb_may_pull(rx->skb,
2116 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2117 return RX_DROP_MONITOR;
2118
2119 /* reload pointers */
2120 hdr = (struct ieee80211_hdr *) skb->data;
2121 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2122
2123 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2124 return RX_DROP_MONITOR;
2125
2126 /* frame is in RMC, don't forward */
2127 if (ieee80211_is_data(hdr->frame_control) &&
2128 is_multicast_ether_addr(hdr->addr1) &&
2129 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2130 return RX_DROP_MONITOR;
2131
2132 if (!ieee80211_is_data(hdr->frame_control) ||
2133 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
2134 return RX_CONTINUE;
2135
2136 if (!mesh_hdr->ttl)
2137 return RX_DROP_MONITOR;
2138
2139 if (mesh_hdr->flags & MESH_FLAGS_AE) {
2140 struct mesh_path *mppath;
2141 char *proxied_addr;
2142 char *mpp_addr;
2143
2144 if (is_multicast_ether_addr(hdr->addr1)) {
2145 mpp_addr = hdr->addr3;
2146 proxied_addr = mesh_hdr->eaddr1;
2147 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2148 /* has_a4 already checked in ieee80211_rx_mesh_check */
2149 mpp_addr = hdr->addr4;
2150 proxied_addr = mesh_hdr->eaddr2;
2151 } else {
2152 return RX_DROP_MONITOR;
2153 }
2154
2155 rcu_read_lock();
2156 mppath = mpp_path_lookup(sdata, proxied_addr);
2157 if (!mppath) {
2158 mpp_path_add(sdata, proxied_addr, mpp_addr);
2159 } else {
2160 spin_lock_bh(&mppath->state_lock);
2161 if (!ether_addr_equal(mppath->mpp, mpp_addr))
2162 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
2163 spin_unlock_bh(&mppath->state_lock);
2164 }
2165 rcu_read_unlock();
2166 }
2167
2168 /* Frame has reached destination. Don't forward */
2169 if (!is_multicast_ether_addr(hdr->addr1) &&
2170 ether_addr_equal(sdata->vif.addr, hdr->addr3))
2171 return RX_CONTINUE;
2172
2173 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2174 q = sdata->vif.hw_queue[ac];
2175 if (ieee80211_queue_stopped(&local->hw, q)) {
2176 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
2177 return RX_DROP_MONITOR;
2178 }
2179 skb_set_queue_mapping(skb, q);
2180
2181 if (!--mesh_hdr->ttl) {
2182 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2183 goto out;
2184 }
2185
2186 if (!ifmsh->mshcfg.dot11MeshForwarding)
2187 goto out;
2188
2189 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2190 if (!fwd_skb) {
2191 net_info_ratelimited("%s: failed to clone mesh frame\n",
2192 sdata->name);
2193 goto out;
2194 }
2195
2196 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2197 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
2198 info = IEEE80211_SKB_CB(fwd_skb);
2199 memset(info, 0, sizeof(*info));
2200 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2201 info->control.vif = &rx->sdata->vif;
2202 info->control.jiffies = jiffies;
2203 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2204 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2205 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2206 /* update power mode indication when forwarding */
2207 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
2208 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
2209 /* mesh power mode flags updated in mesh_nexthop_lookup */
2210 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2211 } else {
2212 /* unable to resolve next hop */
2213 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2214 fwd_hdr->addr3, 0,
2215 WLAN_REASON_MESH_PATH_NOFORWARD,
2216 fwd_hdr->addr2);
2217 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
2218 kfree_skb(fwd_skb);
2219 return RX_DROP_MONITOR;
2220 }
2221
2222 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2223 ieee80211_add_pending_skb(local, fwd_skb);
2224 out:
2225 if (is_multicast_ether_addr(hdr->addr1) ||
2226 sdata->dev->flags & IFF_PROMISC)
2227 return RX_CONTINUE;
2228 else
2229 return RX_DROP_MONITOR;
2230 }
2231 #endif
2232
2233 static ieee80211_rx_result debug_noinline
2234 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
2235 {
2236 struct ieee80211_sub_if_data *sdata = rx->sdata;
2237 struct ieee80211_local *local = rx->local;
2238 struct net_device *dev = sdata->dev;
2239 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2240 __le16 fc = hdr->frame_control;
2241 bool port_control;
2242 int err;
2243
2244 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
2245 return RX_CONTINUE;
2246
2247 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
2248 return RX_DROP_MONITOR;
2249
2250 /*
2251 * Send unexpected-4addr-frame event to hostapd. For older versions,
2252 * also drop the frame to cooked monitor interfaces.
2253 */
2254 if (ieee80211_has_a4(hdr->frame_control) &&
2255 sdata->vif.type == NL80211_IFTYPE_AP) {
2256 if (rx->sta &&
2257 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2258 cfg80211_rx_unexpected_4addr_frame(
2259 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
2260 return RX_DROP_MONITOR;
2261 }
2262
2263 err = __ieee80211_data_to_8023(rx, &port_control);
2264 if (unlikely(err))
2265 return RX_DROP_UNUSABLE;
2266
2267 if (!ieee80211_frame_allowed(rx, fc))
2268 return RX_DROP_MONITOR;
2269
2270 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2271 unlikely(port_control) && sdata->bss) {
2272 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2273 u.ap);
2274 dev = sdata->dev;
2275 rx->sdata = sdata;
2276 }
2277
2278 rx->skb->dev = dev;
2279
2280 dev->stats.rx_packets++;
2281 dev->stats.rx_bytes += rx->skb->len;
2282
2283 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
2284 !is_multicast_ether_addr(
2285 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2286 (!local->scanning &&
2287 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
2288 mod_timer(&local->dynamic_ps_timer, jiffies +
2289 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2290 }
2291
2292 ieee80211_deliver_skb(rx);
2293
2294 return RX_QUEUED;
2295 }
2296
2297 static ieee80211_rx_result debug_noinline
2298 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
2299 {
2300 struct sk_buff *skb = rx->skb;
2301 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
2302 struct tid_ampdu_rx *tid_agg_rx;
2303 u16 start_seq_num;
2304 u16 tid;
2305
2306 if (likely(!ieee80211_is_ctl(bar->frame_control)))
2307 return RX_CONTINUE;
2308
2309 if (ieee80211_is_back_req(bar->frame_control)) {
2310 struct {
2311 __le16 control, start_seq_num;
2312 } __packed bar_data;
2313
2314 if (!rx->sta)
2315 return RX_DROP_MONITOR;
2316
2317 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2318 &bar_data, sizeof(bar_data)))
2319 return RX_DROP_MONITOR;
2320
2321 tid = le16_to_cpu(bar_data.control) >> 12;
2322
2323 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2324 if (!tid_agg_rx)
2325 return RX_DROP_MONITOR;
2326
2327 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
2328
2329 /* reset session timer */
2330 if (tid_agg_rx->timeout)
2331 mod_timer(&tid_agg_rx->session_timer,
2332 TU_TO_EXP_TIME(tid_agg_rx->timeout));
2333
2334 spin_lock(&tid_agg_rx->reorder_lock);
2335 /* release stored frames up to start of BAR */
2336 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2337 start_seq_num, frames);
2338 spin_unlock(&tid_agg_rx->reorder_lock);
2339
2340 kfree_skb(skb);
2341 return RX_QUEUED;
2342 }
2343
2344 /*
2345 * After this point, we only want management frames,
2346 * so we can drop all remaining control frames to
2347 * cooked monitor interfaces.
2348 */
2349 return RX_DROP_MONITOR;
2350 }
2351
2352 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2353 struct ieee80211_mgmt *mgmt,
2354 size_t len)
2355 {
2356 struct ieee80211_local *local = sdata->local;
2357 struct sk_buff *skb;
2358 struct ieee80211_mgmt *resp;
2359
2360 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
2361 /* Not to own unicast address */
2362 return;
2363 }
2364
2365 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2366 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
2367 /* Not from the current AP or not associated yet. */
2368 return;
2369 }
2370
2371 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2372 /* Too short SA Query request frame */
2373 return;
2374 }
2375
2376 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2377 if (skb == NULL)
2378 return;
2379
2380 skb_reserve(skb, local->hw.extra_tx_headroom);
2381 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2382 memset(resp, 0, 24);
2383 memcpy(resp->da, mgmt->sa, ETH_ALEN);
2384 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
2385 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
2386 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2387 IEEE80211_STYPE_ACTION);
2388 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2389 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2390 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2391 memcpy(resp->u.action.u.sa_query.trans_id,
2392 mgmt->u.action.u.sa_query.trans_id,
2393 WLAN_SA_QUERY_TR_ID_LEN);
2394
2395 ieee80211_tx_skb(sdata, skb);
2396 }
2397
2398 static ieee80211_rx_result debug_noinline
2399 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2400 {
2401 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2402 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2403
2404 /*
2405 * From here on, look only at management frames.
2406 * Data and control frames are already handled,
2407 * and unknown (reserved) frames are useless.
2408 */
2409 if (rx->skb->len < 24)
2410 return RX_DROP_MONITOR;
2411
2412 if (!ieee80211_is_mgmt(mgmt->frame_control))
2413 return RX_DROP_MONITOR;
2414
2415 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2416 ieee80211_is_beacon(mgmt->frame_control) &&
2417 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2418 int sig = 0;
2419
2420 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2421 sig = status->signal;
2422
2423 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2424 rx->skb->data, rx->skb->len,
2425 status->freq, sig);
2426 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2427 }
2428
2429 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2430 return RX_DROP_MONITOR;
2431
2432 if (ieee80211_drop_unencrypted_mgmt(rx))
2433 return RX_DROP_UNUSABLE;
2434
2435 return RX_CONTINUE;
2436 }
2437
2438 static ieee80211_rx_result debug_noinline
2439 ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2440 {
2441 struct ieee80211_local *local = rx->local;
2442 struct ieee80211_sub_if_data *sdata = rx->sdata;
2443 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2444 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2445 int len = rx->skb->len;
2446
2447 if (!ieee80211_is_action(mgmt->frame_control))
2448 return RX_CONTINUE;
2449
2450 /* drop too small frames */
2451 if (len < IEEE80211_MIN_ACTION_SIZE)
2452 return RX_DROP_UNUSABLE;
2453
2454 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2455 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2456 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
2457 return RX_DROP_UNUSABLE;
2458
2459 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2460 return RX_DROP_UNUSABLE;
2461
2462 switch (mgmt->u.action.category) {
2463 case WLAN_CATEGORY_HT:
2464 /* reject HT action frames from stations not supporting HT */
2465 if (!rx->sta->sta.ht_cap.ht_supported)
2466 goto invalid;
2467
2468 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2469 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2470 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2471 sdata->vif.type != NL80211_IFTYPE_AP &&
2472 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2473 break;
2474
2475 /* verify action & smps_control/chanwidth are present */
2476 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2477 goto invalid;
2478
2479 switch (mgmt->u.action.u.ht_smps.action) {
2480 case WLAN_HT_ACTION_SMPS: {
2481 struct ieee80211_supported_band *sband;
2482 enum ieee80211_smps_mode smps_mode;
2483
2484 /* convert to HT capability */
2485 switch (mgmt->u.action.u.ht_smps.smps_control) {
2486 case WLAN_HT_SMPS_CONTROL_DISABLED:
2487 smps_mode = IEEE80211_SMPS_OFF;
2488 break;
2489 case WLAN_HT_SMPS_CONTROL_STATIC:
2490 smps_mode = IEEE80211_SMPS_STATIC;
2491 break;
2492 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2493 smps_mode = IEEE80211_SMPS_DYNAMIC;
2494 break;
2495 default:
2496 goto invalid;
2497 }
2498
2499 /* if no change do nothing */
2500 if (rx->sta->sta.smps_mode == smps_mode)
2501 goto handled;
2502 rx->sta->sta.smps_mode = smps_mode;
2503
2504 sband = rx->local->hw.wiphy->bands[status->band];
2505
2506 rate_control_rate_update(local, sband, rx->sta,
2507 IEEE80211_RC_SMPS_CHANGED);
2508 goto handled;
2509 }
2510 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2511 struct ieee80211_supported_band *sband;
2512 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2513 enum ieee80211_sta_rx_bandwidth new_bw;
2514
2515 /* If it doesn't support 40 MHz it can't change ... */
2516 if (!(rx->sta->sta.ht_cap.cap &
2517 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
2518 goto handled;
2519
2520 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2521 new_bw = IEEE80211_STA_RX_BW_20;
2522 else
2523 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
2524
2525 if (rx->sta->sta.bandwidth == new_bw)
2526 goto handled;
2527
2528 sband = rx->local->hw.wiphy->bands[status->band];
2529
2530 rate_control_rate_update(local, sband, rx->sta,
2531 IEEE80211_RC_BW_CHANGED);
2532 goto handled;
2533 }
2534 default:
2535 goto invalid;
2536 }
2537
2538 break;
2539 case WLAN_CATEGORY_PUBLIC:
2540 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2541 goto invalid;
2542 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2543 break;
2544 if (!rx->sta)
2545 break;
2546 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2547 break;
2548 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2549 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2550 break;
2551 if (len < offsetof(struct ieee80211_mgmt,
2552 u.action.u.ext_chan_switch.variable))
2553 goto invalid;
2554 goto queue;
2555 case WLAN_CATEGORY_VHT:
2556 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2557 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2558 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2559 sdata->vif.type != NL80211_IFTYPE_AP &&
2560 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2561 break;
2562
2563 /* verify action code is present */
2564 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2565 goto invalid;
2566
2567 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2568 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2569 u8 opmode;
2570
2571 /* verify opmode is present */
2572 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2573 goto invalid;
2574
2575 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2576
2577 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
2578 opmode, status->band,
2579 false);
2580 goto handled;
2581 }
2582 default:
2583 break;
2584 }
2585 break;
2586 case WLAN_CATEGORY_BACK:
2587 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2588 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2589 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2590 sdata->vif.type != NL80211_IFTYPE_AP &&
2591 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2592 break;
2593
2594 /* verify action_code is present */
2595 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2596 break;
2597
2598 switch (mgmt->u.action.u.addba_req.action_code) {
2599 case WLAN_ACTION_ADDBA_REQ:
2600 if (len < (IEEE80211_MIN_ACTION_SIZE +
2601 sizeof(mgmt->u.action.u.addba_req)))
2602 goto invalid;
2603 break;
2604 case WLAN_ACTION_ADDBA_RESP:
2605 if (len < (IEEE80211_MIN_ACTION_SIZE +
2606 sizeof(mgmt->u.action.u.addba_resp)))
2607 goto invalid;
2608 break;
2609 case WLAN_ACTION_DELBA:
2610 if (len < (IEEE80211_MIN_ACTION_SIZE +
2611 sizeof(mgmt->u.action.u.delba)))
2612 goto invalid;
2613 break;
2614 default:
2615 goto invalid;
2616 }
2617
2618 goto queue;
2619 case WLAN_CATEGORY_SPECTRUM_MGMT:
2620 /* verify action_code is present */
2621 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2622 break;
2623
2624 switch (mgmt->u.action.u.measurement.action_code) {
2625 case WLAN_ACTION_SPCT_MSR_REQ:
2626 if (status->band != IEEE80211_BAND_5GHZ)
2627 break;
2628
2629 if (len < (IEEE80211_MIN_ACTION_SIZE +
2630 sizeof(mgmt->u.action.u.measurement)))
2631 break;
2632
2633 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2634 break;
2635
2636 ieee80211_process_measurement_req(sdata, mgmt, len);
2637 goto handled;
2638 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2639 u8 *bssid;
2640 if (len < (IEEE80211_MIN_ACTION_SIZE +
2641 sizeof(mgmt->u.action.u.chan_switch)))
2642 break;
2643
2644 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2645 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2646 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2647 break;
2648
2649 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2650 bssid = sdata->u.mgd.bssid;
2651 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2652 bssid = sdata->u.ibss.bssid;
2653 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2654 bssid = mgmt->sa;
2655 else
2656 break;
2657
2658 if (!ether_addr_equal(mgmt->bssid, bssid))
2659 break;
2660
2661 goto queue;
2662 }
2663 }
2664 break;
2665 case WLAN_CATEGORY_SA_QUERY:
2666 if (len < (IEEE80211_MIN_ACTION_SIZE +
2667 sizeof(mgmt->u.action.u.sa_query)))
2668 break;
2669
2670 switch (mgmt->u.action.u.sa_query.action) {
2671 case WLAN_ACTION_SA_QUERY_REQUEST:
2672 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2673 break;
2674 ieee80211_process_sa_query_req(sdata, mgmt, len);
2675 goto handled;
2676 }
2677 break;
2678 case WLAN_CATEGORY_SELF_PROTECTED:
2679 if (len < (IEEE80211_MIN_ACTION_SIZE +
2680 sizeof(mgmt->u.action.u.self_prot.action_code)))
2681 break;
2682
2683 switch (mgmt->u.action.u.self_prot.action_code) {
2684 case WLAN_SP_MESH_PEERING_OPEN:
2685 case WLAN_SP_MESH_PEERING_CLOSE:
2686 case WLAN_SP_MESH_PEERING_CONFIRM:
2687 if (!ieee80211_vif_is_mesh(&sdata->vif))
2688 goto invalid;
2689 if (sdata->u.mesh.user_mpm)
2690 /* userspace handles this frame */
2691 break;
2692 goto queue;
2693 case WLAN_SP_MGK_INFORM:
2694 case WLAN_SP_MGK_ACK:
2695 if (!ieee80211_vif_is_mesh(&sdata->vif))
2696 goto invalid;
2697 break;
2698 }
2699 break;
2700 case WLAN_CATEGORY_MESH_ACTION:
2701 if (len < (IEEE80211_MIN_ACTION_SIZE +
2702 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2703 break;
2704
2705 if (!ieee80211_vif_is_mesh(&sdata->vif))
2706 break;
2707 if (mesh_action_is_path_sel(mgmt) &&
2708 !mesh_path_sel_is_hwmp(sdata))
2709 break;
2710 goto queue;
2711 }
2712
2713 return RX_CONTINUE;
2714
2715 invalid:
2716 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2717 /* will return in the next handlers */
2718 return RX_CONTINUE;
2719
2720 handled:
2721 if (rx->sta)
2722 rx->sta->rx_packets++;
2723 dev_kfree_skb(rx->skb);
2724 return RX_QUEUED;
2725
2726 queue:
2727 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2728 skb_queue_tail(&sdata->skb_queue, rx->skb);
2729 ieee80211_queue_work(&local->hw, &sdata->work);
2730 if (rx->sta)
2731 rx->sta->rx_packets++;
2732 return RX_QUEUED;
2733 }
2734
2735 static ieee80211_rx_result debug_noinline
2736 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2737 {
2738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2739 int sig = 0;
2740
2741 /* skip known-bad action frames and return them in the next handler */
2742 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2743 return RX_CONTINUE;
2744
2745 /*
2746 * Getting here means the kernel doesn't know how to handle
2747 * it, but maybe userspace does ... include returned frames
2748 * so userspace can register for those to know whether ones
2749 * it transmitted were processed or returned.
2750 */
2751
2752 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2753 sig = status->signal;
2754
2755 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2756 rx->skb->data, rx->skb->len, 0)) {
2757 if (rx->sta)
2758 rx->sta->rx_packets++;
2759 dev_kfree_skb(rx->skb);
2760 return RX_QUEUED;
2761 }
2762
2763 return RX_CONTINUE;
2764 }
2765
2766 static ieee80211_rx_result debug_noinline
2767 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2768 {
2769 struct ieee80211_local *local = rx->local;
2770 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2771 struct sk_buff *nskb;
2772 struct ieee80211_sub_if_data *sdata = rx->sdata;
2773 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2774
2775 if (!ieee80211_is_action(mgmt->frame_control))
2776 return RX_CONTINUE;
2777
2778 /*
2779 * For AP mode, hostapd is responsible for handling any action
2780 * frames that we didn't handle, including returning unknown
2781 * ones. For all other modes we will return them to the sender,
2782 * setting the 0x80 bit in the action category, as required by
2783 * 802.11-2012 9.24.4.
2784 * Newer versions of hostapd shall also use the management frame
2785 * registration mechanisms, but older ones still use cooked
2786 * monitor interfaces so push all frames there.
2787 */
2788 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2789 (sdata->vif.type == NL80211_IFTYPE_AP ||
2790 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2791 return RX_DROP_MONITOR;
2792
2793 if (is_multicast_ether_addr(mgmt->da))
2794 return RX_DROP_MONITOR;
2795
2796 /* do not return rejected action frames */
2797 if (mgmt->u.action.category & 0x80)
2798 return RX_DROP_UNUSABLE;
2799
2800 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2801 GFP_ATOMIC);
2802 if (nskb) {
2803 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
2804
2805 nmgmt->u.action.category |= 0x80;
2806 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2807 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
2808
2809 memset(nskb->cb, 0, sizeof(nskb->cb));
2810
2811 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2812 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2813
2814 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2815 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2816 IEEE80211_TX_CTL_NO_CCK_RATE;
2817 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2818 info->hw_queue =
2819 local->hw.offchannel_tx_hw_queue;
2820 }
2821
2822 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2823 status->band);
2824 }
2825 dev_kfree_skb(rx->skb);
2826 return RX_QUEUED;
2827 }
2828
2829 static ieee80211_rx_result debug_noinline
2830 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
2831 {
2832 struct ieee80211_sub_if_data *sdata = rx->sdata;
2833 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2834 __le16 stype;
2835
2836 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
2837
2838 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2839 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2840 sdata->vif.type != NL80211_IFTYPE_STATION)
2841 return RX_DROP_MONITOR;
2842
2843 switch (stype) {
2844 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2845 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2846 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2847 /* process for all: mesh, mlme, ibss */
2848 break;
2849 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2850 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
2851 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2852 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2853 if (is_multicast_ether_addr(mgmt->da) &&
2854 !is_broadcast_ether_addr(mgmt->da))
2855 return RX_DROP_MONITOR;
2856
2857 /* process only for station */
2858 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2859 return RX_DROP_MONITOR;
2860 break;
2861 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2862 /* process only for ibss and mesh */
2863 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2864 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2865 return RX_DROP_MONITOR;
2866 break;
2867 default:
2868 return RX_DROP_MONITOR;
2869 }
2870
2871 /* queue up frame and kick off work to process it */
2872 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2873 skb_queue_tail(&sdata->skb_queue, rx->skb);
2874 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2875 if (rx->sta)
2876 rx->sta->rx_packets++;
2877
2878 return RX_QUEUED;
2879 }
2880
2881 /* TODO: use IEEE80211_RX_FRAGMENTED */
2882 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2883 struct ieee80211_rate *rate)
2884 {
2885 struct ieee80211_sub_if_data *sdata;
2886 struct ieee80211_local *local = rx->local;
2887 struct sk_buff *skb = rx->skb, *skb2;
2888 struct net_device *prev_dev = NULL;
2889 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2890 int needed_headroom;
2891
2892 /*
2893 * If cooked monitor has been processed already, then
2894 * don't do it again. If not, set the flag.
2895 */
2896 if (rx->flags & IEEE80211_RX_CMNTR)
2897 goto out_free_skb;
2898 rx->flags |= IEEE80211_RX_CMNTR;
2899
2900 /* If there are no cooked monitor interfaces, just free the SKB */
2901 if (!local->cooked_mntrs)
2902 goto out_free_skb;
2903
2904 /* room for the radiotap header based on driver features */
2905 needed_headroom = ieee80211_rx_radiotap_space(local, status);
2906
2907 if (skb_headroom(skb) < needed_headroom &&
2908 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2909 goto out_free_skb;
2910
2911 /* prepend radiotap information */
2912 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2913 false);
2914
2915 skb_set_mac_header(skb, 0);
2916 skb->ip_summed = CHECKSUM_UNNECESSARY;
2917 skb->pkt_type = PACKET_OTHERHOST;
2918 skb->protocol = htons(ETH_P_802_2);
2919
2920 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2921 if (!ieee80211_sdata_running(sdata))
2922 continue;
2923
2924 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
2925 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2926 continue;
2927
2928 if (prev_dev) {
2929 skb2 = skb_clone(skb, GFP_ATOMIC);
2930 if (skb2) {
2931 skb2->dev = prev_dev;
2932 netif_receive_skb(skb2);
2933 }
2934 }
2935
2936 prev_dev = sdata->dev;
2937 sdata->dev->stats.rx_packets++;
2938 sdata->dev->stats.rx_bytes += skb->len;
2939 }
2940
2941 if (prev_dev) {
2942 skb->dev = prev_dev;
2943 netif_receive_skb(skb);
2944 return;
2945 }
2946
2947 out_free_skb:
2948 dev_kfree_skb(skb);
2949 }
2950
2951 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2952 ieee80211_rx_result res)
2953 {
2954 switch (res) {
2955 case RX_DROP_MONITOR:
2956 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2957 if (rx->sta)
2958 rx->sta->rx_dropped++;
2959 /* fall through */
2960 case RX_CONTINUE: {
2961 struct ieee80211_rate *rate = NULL;
2962 struct ieee80211_supported_band *sband;
2963 struct ieee80211_rx_status *status;
2964
2965 status = IEEE80211_SKB_RXCB((rx->skb));
2966
2967 sband = rx->local->hw.wiphy->bands[status->band];
2968 if (!(status->flag & RX_FLAG_HT) &&
2969 !(status->flag & RX_FLAG_VHT))
2970 rate = &sband->bitrates[status->rate_idx];
2971
2972 ieee80211_rx_cooked_monitor(rx, rate);
2973 break;
2974 }
2975 case RX_DROP_UNUSABLE:
2976 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2977 if (rx->sta)
2978 rx->sta->rx_dropped++;
2979 dev_kfree_skb(rx->skb);
2980 break;
2981 case RX_QUEUED:
2982 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2983 break;
2984 }
2985 }
2986
2987 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2988 struct sk_buff_head *frames)
2989 {
2990 ieee80211_rx_result res = RX_DROP_MONITOR;
2991 struct sk_buff *skb;
2992
2993 #define CALL_RXH(rxh) \
2994 do { \
2995 res = rxh(rx); \
2996 if (res != RX_CONTINUE) \
2997 goto rxh_next; \
2998 } while (0);
2999
3000 spin_lock_bh(&rx->local->rx_path_lock);
3001
3002 while ((skb = __skb_dequeue(frames))) {
3003 /*
3004 * all the other fields are valid across frames
3005 * that belong to an aMPDU since they are on the
3006 * same TID from the same station
3007 */
3008 rx->skb = skb;
3009
3010 CALL_RXH(ieee80211_rx_h_check_more_data)
3011 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
3012 CALL_RXH(ieee80211_rx_h_sta_process)
3013 CALL_RXH(ieee80211_rx_h_decrypt)
3014 CALL_RXH(ieee80211_rx_h_defragment)
3015 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3016 /* must be after MMIC verify so header is counted in MPDU mic */
3017 #ifdef CONFIG_MAC80211_MESH
3018 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3019 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3020 #endif
3021 CALL_RXH(ieee80211_rx_h_amsdu)
3022 CALL_RXH(ieee80211_rx_h_data)
3023
3024 /* special treatment -- needs the queue */
3025 res = ieee80211_rx_h_ctrl(rx, frames);
3026 if (res != RX_CONTINUE)
3027 goto rxh_next;
3028
3029 CALL_RXH(ieee80211_rx_h_mgmt_check)
3030 CALL_RXH(ieee80211_rx_h_action)
3031 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3032 CALL_RXH(ieee80211_rx_h_action_return)
3033 CALL_RXH(ieee80211_rx_h_mgmt)
3034
3035 rxh_next:
3036 ieee80211_rx_handlers_result(rx, res);
3037
3038 #undef CALL_RXH
3039 }
3040
3041 spin_unlock_bh(&rx->local->rx_path_lock);
3042 }
3043
3044 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
3045 {
3046 struct sk_buff_head reorder_release;
3047 ieee80211_rx_result res = RX_DROP_MONITOR;
3048
3049 __skb_queue_head_init(&reorder_release);
3050
3051 #define CALL_RXH(rxh) \
3052 do { \
3053 res = rxh(rx); \
3054 if (res != RX_CONTINUE) \
3055 goto rxh_next; \
3056 } while (0);
3057
3058 CALL_RXH(ieee80211_rx_h_check)
3059
3060 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
3061
3062 ieee80211_rx_handlers(rx, &reorder_release);
3063 return;
3064
3065 rxh_next:
3066 ieee80211_rx_handlers_result(rx, res);
3067
3068 #undef CALL_RXH
3069 }
3070
3071 /*
3072 * This function makes calls into the RX path, therefore
3073 * it has to be invoked under RCU read lock.
3074 */
3075 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3076 {
3077 struct sk_buff_head frames;
3078 struct ieee80211_rx_data rx = {
3079 .sta = sta,
3080 .sdata = sta->sdata,
3081 .local = sta->local,
3082 /* This is OK -- must be QoS data frame */
3083 .security_idx = tid,
3084 .seqno_idx = tid,
3085 .flags = IEEE80211_RX_REORDER_TIMER,
3086 };
3087 struct tid_ampdu_rx *tid_agg_rx;
3088
3089 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3090 if (!tid_agg_rx)
3091 return;
3092
3093 __skb_queue_head_init(&frames);
3094
3095 spin_lock(&tid_agg_rx->reorder_lock);
3096 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3097 spin_unlock(&tid_agg_rx->reorder_lock);
3098
3099 ieee80211_rx_handlers(&rx, &frames);
3100 }
3101
3102 /* main receive path */
3103
3104 static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3105 struct ieee80211_hdr *hdr)
3106 {
3107 struct ieee80211_sub_if_data *sdata = rx->sdata;
3108 struct sk_buff *skb = rx->skb;
3109 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3110 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
3111 int multicast = is_multicast_ether_addr(hdr->addr1);
3112
3113 switch (sdata->vif.type) {
3114 case NL80211_IFTYPE_STATION:
3115 if (!bssid && !sdata->u.mgd.use_4addr)
3116 return false;
3117 if (!multicast &&
3118 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3119 if (!(sdata->dev->flags & IFF_PROMISC) ||
3120 sdata->u.mgd.use_4addr)
3121 return false;
3122 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3123 }
3124 break;
3125 case NL80211_IFTYPE_ADHOC:
3126 if (!bssid)
3127 return false;
3128 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3129 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3130 return false;
3131 if (ieee80211_is_beacon(hdr->frame_control)) {
3132 return true;
3133 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3134 return false;
3135 } else if (!multicast &&
3136 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3137 if (!(sdata->dev->flags & IFF_PROMISC))
3138 return false;
3139 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3140 } else if (!rx->sta) {
3141 int rate_idx;
3142 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3143 rate_idx = 0; /* TODO: HT/VHT rates */
3144 else
3145 rate_idx = status->rate_idx;
3146 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3147 BIT(rate_idx));
3148 }
3149 break;
3150 case NL80211_IFTYPE_MESH_POINT:
3151 if (!multicast &&
3152 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
3153 if (!(sdata->dev->flags & IFF_PROMISC))
3154 return false;
3155
3156 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3157 }
3158 break;
3159 case NL80211_IFTYPE_AP_VLAN:
3160 case NL80211_IFTYPE_AP:
3161 if (!bssid) {
3162 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3163 return false;
3164 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3165 /*
3166 * Accept public action frames even when the
3167 * BSSID doesn't match, this is used for P2P
3168 * and location updates. Note that mac80211
3169 * itself never looks at these frames.
3170 */
3171 if (!multicast &&
3172 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3173 return false;
3174 if (ieee80211_is_public_action(hdr, skb->len))
3175 return true;
3176 if (!ieee80211_is_beacon(hdr->frame_control))
3177 return false;
3178 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3179 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3180 /* ignore data frames to TDLS-peers */
3181 if (ieee80211_is_data(hdr->frame_control))
3182 return false;
3183 /* ignore action frames to TDLS-peers */
3184 if (ieee80211_is_action(hdr->frame_control) &&
3185 !is_broadcast_ether_addr(bssid) &&
3186 !ether_addr_equal(bssid, hdr->addr1))
3187 return false;
3188 }
3189 break;
3190 case NL80211_IFTYPE_WDS:
3191 if (bssid || !ieee80211_is_data(hdr->frame_control))
3192 return false;
3193 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3194 return false;
3195 break;
3196 case NL80211_IFTYPE_P2P_DEVICE:
3197 if (!ieee80211_is_public_action(hdr, skb->len) &&
3198 !ieee80211_is_probe_req(hdr->frame_control) &&
3199 !ieee80211_is_probe_resp(hdr->frame_control) &&
3200 !ieee80211_is_beacon(hdr->frame_control))
3201 return false;
3202 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3203 !multicast)
3204 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3205 break;
3206 default:
3207 /* should never get here */
3208 WARN_ON_ONCE(1);
3209 break;
3210 }
3211
3212 return true;
3213 }
3214
3215 /*
3216 * This function returns whether or not the SKB
3217 * was destined for RX processing or not, which,
3218 * if consume is true, is equivalent to whether
3219 * or not the skb was consumed.
3220 */
3221 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3222 struct sk_buff *skb, bool consume)
3223 {
3224 struct ieee80211_local *local = rx->local;
3225 struct ieee80211_sub_if_data *sdata = rx->sdata;
3226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3227 struct ieee80211_hdr *hdr = (void *)skb->data;
3228
3229 rx->skb = skb;
3230 status->rx_flags |= IEEE80211_RX_RA_MATCH;
3231
3232 if (!prepare_for_handlers(rx, hdr))
3233 return false;
3234
3235 if (!consume) {
3236 skb = skb_copy(skb, GFP_ATOMIC);
3237 if (!skb) {
3238 if (net_ratelimit())
3239 wiphy_debug(local->hw.wiphy,
3240 "failed to copy skb for %s\n",
3241 sdata->name);
3242 return true;
3243 }
3244
3245 rx->skb = skb;
3246 }
3247
3248 ieee80211_invoke_rx_handlers(rx);
3249 return true;
3250 }
3251
3252 /*
3253 * This is the actual Rx frames handler. as it belongs to Rx path it must
3254 * be called with rcu_read_lock protection.
3255 */
3256 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
3257 struct sk_buff *skb)
3258 {
3259 struct ieee80211_local *local = hw_to_local(hw);
3260 struct ieee80211_sub_if_data *sdata;
3261 struct ieee80211_hdr *hdr;
3262 __le16 fc;
3263 struct ieee80211_rx_data rx;
3264 struct ieee80211_sub_if_data *prev;
3265 struct sta_info *sta, *tmp, *prev_sta;
3266 int err = 0;
3267
3268 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
3269 memset(&rx, 0, sizeof(rx));
3270 rx.skb = skb;
3271 rx.local = local;
3272
3273 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
3274 local->dot11ReceivedFragmentCount++;
3275
3276 if (ieee80211_is_mgmt(fc)) {
3277 /* drop frame if too short for header */
3278 if (skb->len < ieee80211_hdrlen(fc))
3279 err = -ENOBUFS;
3280 else
3281 err = skb_linearize(skb);
3282 } else {
3283 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
3284 }
3285
3286 if (err) {
3287 dev_kfree_skb(skb);
3288 return;
3289 }
3290
3291 hdr = (struct ieee80211_hdr *)skb->data;
3292 ieee80211_parse_qos(&rx);
3293 ieee80211_verify_alignment(&rx);
3294
3295 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3296 ieee80211_is_beacon(hdr->frame_control)))
3297 ieee80211_scan_rx(local, skb);
3298
3299 if (ieee80211_is_data(fc)) {
3300 prev_sta = NULL;
3301
3302 for_each_sta_info(local, hdr->addr2, sta, tmp) {
3303 if (!prev_sta) {
3304 prev_sta = sta;
3305 continue;
3306 }
3307
3308 rx.sta = prev_sta;
3309 rx.sdata = prev_sta->sdata;
3310 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3311
3312 prev_sta = sta;
3313 }
3314
3315 if (prev_sta) {
3316 rx.sta = prev_sta;
3317 rx.sdata = prev_sta->sdata;
3318
3319 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3320 return;
3321 goto out;
3322 }
3323 }
3324
3325 prev = NULL;
3326
3327 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3328 if (!ieee80211_sdata_running(sdata))
3329 continue;
3330
3331 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3332 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3333 continue;
3334
3335 /*
3336 * frame is destined for this interface, but if it's
3337 * not also for the previous one we handle that after
3338 * the loop to avoid copying the SKB once too much
3339 */
3340
3341 if (!prev) {
3342 prev = sdata;
3343 continue;
3344 }
3345
3346 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3347 rx.sdata = prev;
3348 ieee80211_prepare_and_rx_handle(&rx, skb, false);
3349
3350 prev = sdata;
3351 }
3352
3353 if (prev) {
3354 rx.sta = sta_info_get_bss(prev, hdr->addr2);
3355 rx.sdata = prev;
3356
3357 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3358 return;
3359 }
3360
3361 out:
3362 dev_kfree_skb(skb);
3363 }
3364
3365 /*
3366 * This is the receive path handler. It is called by a low level driver when an
3367 * 802.11 MPDU is received from the hardware.
3368 */
3369 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
3370 {
3371 struct ieee80211_local *local = hw_to_local(hw);
3372 struct ieee80211_rate *rate = NULL;
3373 struct ieee80211_supported_band *sband;
3374 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3375
3376 WARN_ON_ONCE(softirq_count() == 0);
3377
3378 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
3379 goto drop;
3380
3381 sband = local->hw.wiphy->bands[status->band];
3382 if (WARN_ON(!sband))
3383 goto drop;
3384
3385 /*
3386 * If we're suspending, it is possible although not too likely
3387 * that we'd be receiving frames after having already partially
3388 * quiesced the stack. We can't process such frames then since
3389 * that might, for example, cause stations to be added or other
3390 * driver callbacks be invoked.
3391 */
3392 if (unlikely(local->quiescing || local->suspended))
3393 goto drop;
3394
3395 /* We might be during a HW reconfig, prevent Rx for the same reason */
3396 if (unlikely(local->in_reconfig))
3397 goto drop;
3398
3399 /*
3400 * The same happens when we're not even started,
3401 * but that's worth a warning.
3402 */
3403 if (WARN_ON(!local->started))
3404 goto drop;
3405
3406 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
3407 /*
3408 * Validate the rate, unless a PLCP error means that
3409 * we probably can't have a valid rate here anyway.
3410 */
3411
3412 if (status->flag & RX_FLAG_HT) {
3413 /*
3414 * rate_idx is MCS index, which can be [0-76]
3415 * as documented on:
3416 *
3417 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3418 *
3419 * Anything else would be some sort of driver or
3420 * hardware error. The driver should catch hardware
3421 * errors.
3422 */
3423 if (WARN(status->rate_idx > 76,
3424 "Rate marked as an HT rate but passed "
3425 "status->rate_idx is not "
3426 "an MCS index [0-76]: %d (0x%02x)\n",
3427 status->rate_idx,
3428 status->rate_idx))
3429 goto drop;
3430 } else if (status->flag & RX_FLAG_VHT) {
3431 if (WARN_ONCE(status->rate_idx > 9 ||
3432 !status->vht_nss ||
3433 status->vht_nss > 8,
3434 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3435 status->rate_idx, status->vht_nss))
3436 goto drop;
3437 } else {
3438 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
3439 goto drop;
3440 rate = &sband->bitrates[status->rate_idx];
3441 }
3442 }
3443
3444 status->rx_flags = 0;
3445
3446 /*
3447 * key references and virtual interfaces are protected using RCU
3448 * and this requires that we are in a read-side RCU section during
3449 * receive processing
3450 */
3451 rcu_read_lock();
3452
3453 /*
3454 * Frames with failed FCS/PLCP checksum are not returned,
3455 * all other frames are returned without radiotap header
3456 * if it was previously present.
3457 * Also, frames with less than 16 bytes are dropped.
3458 */
3459 skb = ieee80211_rx_monitor(local, skb, rate);
3460 if (!skb) {
3461 rcu_read_unlock();
3462 return;
3463 }
3464
3465 ieee80211_tpt_led_trig_rx(local,
3466 ((struct ieee80211_hdr *)skb->data)->frame_control,
3467 skb->len);
3468 __ieee80211_rx_handle_packet(hw, skb);
3469
3470 rcu_read_unlock();
3471
3472 return;
3473 drop:
3474 kfree_skb(skb);
3475 }
3476 EXPORT_SYMBOL(ieee80211_rx);
3477
3478 /* This is a version of the rx handler that can be called from hard irq
3479 * context. Post the skb on the queue and schedule the tasklet */
3480 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
3481 {
3482 struct ieee80211_local *local = hw_to_local(hw);
3483
3484 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3485
3486 skb->pkt_type = IEEE80211_RX_MSG;
3487 skb_queue_tail(&local->skb_queue, skb);
3488 tasklet_schedule(&local->tasklet);
3489 }
3490 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux with added FPC-III support