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mac80211: change ieee80211_rx_reorder_ready() arguments
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
fb4ea054 7 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
571ecf67
JB		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
ab46623e 14#include <linux/jiffies.h>
5a0e3ad6 15#include <linux/slab.h>
571ecf67
JB		 16#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
d4e46a3d 20#include <linux/rcupdate.h>
bc3b2d7f 21#include <linux/export.h>
571ecf67
JB		 22#include <net/mac80211.h>
23#include <net/ieee80211_radiotap.h>
d26ad377 24#include <asm/unaligned.h>
571ecf67
JB		 25
26#include "ieee80211_i.h"
24487981 27#include "driver-ops.h"
2c8dccc7 28#include "led.h"
33b64eb2 29#include "mesh.h"
571ecf67
JB		 30#include "wep.h"
31#include "wpa.h"
32#include "tkip.h"
33#include "wme.h"
1d8d3dec 34#include "rate.h"
571ecf67 35
5a490510
JB		 36static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
37{
38 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
39
40 u64_stats_update_begin(&tstats->syncp);
41 tstats->rx_packets++;
42 tstats->rx_bytes += len;
43 u64_stats_update_end(&tstats->syncp);
44}
45
a6828493
JB		 46static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
47 enum nl80211_iftype type)
48{
49 __le16 fc = hdr->frame_control;
50
51 if (ieee80211_is_data(fc)) {
52 if (len < 24) /* drop incorrect hdr len (data) */
53 return NULL;
54
55 if (ieee80211_has_a4(fc))
56 return NULL;
57 if (ieee80211_has_tods(fc))
58 return hdr->addr1;
59 if (ieee80211_has_fromds(fc))
60 return hdr->addr2;
61
62 return hdr->addr3;
63 }
64
65 if (ieee80211_is_mgmt(fc)) {
66 if (len < 24) /* drop incorrect hdr len (mgmt) */
67 return NULL;
68 return hdr->addr3;
69 }
70
71 if (ieee80211_is_ctl(fc)) {
72 if (ieee80211_is_pspoll(fc))
73 return hdr->addr1;
74
75 if (ieee80211_is_back_req(fc)) {
76 switch (type) {
77 case NL80211_IFTYPE_STATION:
78 return hdr->addr2;
79 case NL80211_IFTYPE_AP:
80 case NL80211_IFTYPE_AP_VLAN:
81 return hdr->addr1;
82 default:
83 break; /* fall through to the return */
84 }
85 }
86 }
87
88 return NULL;
89}
90
b2e7771e
JB		 91/*
92 * monitor mode reception
93 *
94 * This function cleans up the SKB, i.e. it removes all the stuff
95 * only useful for monitoring.
96 */
97static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
1f7bba79
JB		 98 struct sk_buff *skb,
99 unsigned int rtap_vendor_space)
b2e7771e 100{
30686bf7 101 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
b2e7771e 102 if (likely(skb->len > FCS_LEN))
e3cf8b3f 103 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 104 else {
105 /* driver bug */
106 WARN_ON(1);
107 dev_kfree_skb(skb);
0624760c 108 return NULL;
b2e7771e
JB		 109 }
110 }
111
1f7bba79
JB		 112 __pskb_pull(skb, rtap_vendor_space);
113
b2e7771e
JB		 114 return skb;
115}
116
1f7bba79
JB		 117static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
118 unsigned int rtap_vendor_space)
b2e7771e 119{
f1d58c25 120 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 121 struct ieee80211_hdr *hdr;
122
123 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 124
4c298677 125 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
17883048
GB		 126 RX_FLAG_FAILED_PLCP_CRC |
127 RX_FLAG_ONLY_MONITOR))
6b59db7d
ZG		 128 return true;
129
1f7bba79 130 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 131 return true;
132
87228f57
HH		 133 if (ieee80211_is_ctl(hdr->frame_control) &&
134 !ieee80211_is_pspoll(hdr->frame_control) &&
135 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 136 return true;
137
138 return false;
b2e7771e
JB		 139}
140
601ae7f2 141static int
1f7bba79
JB		 142ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
143 struct ieee80211_rx_status *status,
144 struct sk_buff *skb)
601ae7f2
BR		 145{
146 int len;
147
148 /* always present fields */
a144f378 149 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 150
a144f378 151 /* allocate extra bitmaps */
a144f378
JB		 152 if (status->chains)
153 len += 4 * hweight8(status->chains);
90b9e446
JB		 154
155 if (ieee80211_have_rx_timestamp(status)) {
156 len = ALIGN(len, 8);
601ae7f2 157 len += 8;
90b9e446 158 }
30686bf7 159 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 160 len += 1;
601ae7f2 161
a144f378
JB		 162 /* antenna field, if we don't have per-chain info */
163 if (!status->chains)
164 len += 1;
165
90b9e446
JB		 166 /* padding for RX_FLAGS if necessary */
167 len = ALIGN(len, 2);
601ae7f2 168
6d744bac
JB		 169 if (status->flag & RX_FLAG_HT) /* HT info */
170 len += 3;
171
4c298677 172 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 173 len = ALIGN(len, 4);
4c298677
JB		 174 len += 8;
175 }
176
51648921
JB		 177 if (status->flag & RX_FLAG_VHT) {
178 len = ALIGN(len, 2);
179 len += 12;
180 }
181
a144f378
JB		 182 if (status->chains) {
183 /* antenna and antenna signal fields */
184 len += 2 * hweight8(status->chains);
185 }
186
1f7bba79
JB		 187 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
188 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
189
190 /* vendor presence bitmap */
191 len += 4;
192 /* alignment for fixed 6-byte vendor data header */
193 len = ALIGN(len, 2);
194 /* vendor data header */
195 len += 6;
196 if (WARN_ON(rtap->align == 0))
197 rtap->align = 1;
198 len = ALIGN(len, rtap->align);
199 len += rtap->len + rtap->pad;
200 }
201
601ae7f2
BR		 202 return len;
203}
204
00ea6deb 205/*
601ae7f2
BR		 206 * ieee80211_add_rx_radiotap_header - add radiotap header
207 *
208 * add a radiotap header containing all the fields which the hardware provided.
209 */
210static void
211ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
212 struct sk_buff *skb,
601ae7f2 213 struct ieee80211_rate *rate,
973ef21a 214 int rtap_len, bool has_fcs)
601ae7f2 215{
f1d58c25 216 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 217 struct ieee80211_radiotap_header *rthdr;
218 unsigned char *pos;
a144f378
JB		 219 __le32 *it_present;
220 u32 it_present_val;
6a86b9c7 221 u16 rx_flags = 0;
a5e70697 222 u16 channel_flags = 0;
a144f378
JB		 223 int mpdulen, chain;
224 unsigned long chains = status->chains;
1f7bba79
JB		 225 struct ieee80211_vendor_radiotap rtap = {};
226
227 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
228 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
229 /* rtap.len and rtap.pad are undone immediately */
230 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
231 }
f4bda337
TP		 232
233 mpdulen = skb->len;
30686bf7 234 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 235 mpdulen += FCS_LEN;
601ae7f2
BR		 236
237 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 238 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 239 it_present = &rthdr->it_present;
601ae7f2
BR		 240
241 /* radiotap header, set always present flags */
0059b2b1 242 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 243 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
244 BIT(IEEE80211_RADIOTAP_CHANNEL) |
245 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
246
247 if (!status->chains)
248 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
249
250 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
251 it_present_val |=
252 BIT(IEEE80211_RADIOTAP_EXT) |
253 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
254 put_unaligned_le32(it_present_val, it_present);
255 it_present++;
256 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
257 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
258 }
601ae7f2 259
1f7bba79
JB		 260 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
261 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
262 BIT(IEEE80211_RADIOTAP_EXT);
263 put_unaligned_le32(it_present_val, it_present);
264 it_present++;
265 it_present_val = rtap.present;
266 }
267
a144f378
JB		 268 put_unaligned_le32(it_present_val, it_present);
269
270 pos = (void *)(it_present + 1);
271
601ae7f2
BR		 272 /* the order of the following fields is important */
273
274 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 275 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 276 /* padding */
277 while ((pos - (u8 *)rthdr) & 7)
278 *pos++ = 0;
f4bda337
TP		 279 put_unaligned_le64(
280 ieee80211_calculate_rx_timestamp(local, status,
281 mpdulen, 0),
282 pos);
1df332e8 283 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 284 pos += 8;
285 }
286
287 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 288 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 289 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 290 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
291 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 292 if (status->flag & RX_FLAG_SHORTPRE)
293 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 294 pos++;
295
296 /* IEEE80211_RADIOTAP_RATE */
5614618e 297 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 298 /*
f8d1ccf1 299 * Without rate information don't add it. If we have,
38f37be2 300 * MCS information is a separate field in radiotap,
73b48099
JB		 301 * added below. The byte here is needed as padding
302 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 303 */
304 *pos = 0;
8d6f658e 305 } else {
2103dec1 306 int shift = 0;
ebe6c7ba 307 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 308 if (status->flag & RX_FLAG_10MHZ)
309 shift = 1;
310 else if (status->flag & RX_FLAG_5MHZ)
311 shift = 2;
312 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 313 }
601ae7f2
BR		 314 pos++;
315
316 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 317 put_unaligned_le16(status->freq, pos);
601ae7f2 318 pos += 2;
a5e70697
SW		 319 if (status->flag & RX_FLAG_10MHZ)
320 channel_flags |= IEEE80211_CHAN_HALF;
321 else if (status->flag & RX_FLAG_5MHZ)
322 channel_flags |= IEEE80211_CHAN_QUARTER;
323
601ae7f2 324 if (status->band == IEEE80211_BAND_5GHZ)
a5e70697 325 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 326 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 327 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 328 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 329 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 330 else if (rate)
3a5c5e81 331 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 332 else
a5e70697
SW		 333 channel_flags |= IEEE80211_CHAN_2GHZ;
334 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 335 pos += 2;
336
337 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 338 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 339 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 340 *pos = status->signal;
341 rthdr->it_present |=
342 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
343 pos++;
344 }
345
601ae7f2
BR		 346 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
347
a144f378
JB		 348 if (!status->chains) {
349 /* IEEE80211_RADIOTAP_ANTENNA */
350 *pos = status->antenna;
351 pos++;
352 }
601ae7f2 353
601ae7f2
BR		 354 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
355
356 /* IEEE80211_RADIOTAP_RX_FLAGS */
357 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 358 if ((pos - (u8 *)rthdr) & 1)
90b9e446 359 *pos++ = 0;
aae89831 360 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 361 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
362 put_unaligned_le16(rx_flags, pos);
601ae7f2 363 pos += 2;
6d744bac
JB		 364
365 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 366 unsigned int stbc;
367
6d744bac 368 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 369 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 370 *pos = 0;
371 if (status->flag & RX_FLAG_SHORT_GI)
372 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
373 if (status->flag & RX_FLAG_40MHZ)
374 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 375 if (status->flag & RX_FLAG_HT_GF)
376 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
63c361f5
EG		 377 if (status->flag & RX_FLAG_LDPC)
378 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
786677d1
OR		 379 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
380 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 381 pos++;
382 *pos++ = status->rate_idx;
383 }
4c298677
JB		 384
385 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
386 u16 flags = 0;
387
388 /* ensure 4 byte alignment */
389 while ((pos - (u8 *)rthdr) & 3)
390 pos++;
391 rthdr->it_present |=
392 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
393 put_unaligned_le32(status->ampdu_reference, pos);
394 pos += 4;
4c298677
JB		 395 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
396 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
397 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
398 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
399 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
400 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
401 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
402 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
403 put_unaligned_le16(flags, pos);
404 pos += 2;
405 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
406 *pos++ = status->ampdu_delimiter_crc;
407 else
408 *pos++ = 0;
409 *pos++ = 0;
410 }
90b9e446 411
51648921
JB		 412 if (status->flag & RX_FLAG_VHT) {
413 u16 known = local->hw.radiotap_vht_details;
414
415 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 416 put_unaligned_le16(known, pos);
417 pos += 2;
418 /* flags */
419 if (status->flag & RX_FLAG_SHORT_GI)
420 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 421 /* in VHT, STBC is binary */
422 if (status->flag & RX_FLAG_STBC_MASK)
423 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 424 if (status->vht_flag & RX_VHT_FLAG_BF)
425 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 426 pos++;
427 /* bandwidth */
1b8d242a 428 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 429 *pos++ = 4;
1b8d242a 430 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 431 *pos++ = 11;
432 else if (status->flag & RX_FLAG_40MHZ)
433 *pos++ = 1;
434 else /* 20 MHz */
435 *pos++ = 0;
436 /* MCS/NSS */
437 *pos = (status->rate_idx << 4) | status->vht_nss;
438 pos += 4;
439 /* coding field */
63c361f5
EG		 440 if (status->flag & RX_FLAG_LDPC)
441 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 442 pos++;
443 /* group ID */
444 pos++;
445 /* partial_aid */
446 pos += 2;
447 }
448
a144f378
JB		 449 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
450 *pos++ = status->chain_signal[chain];
451 *pos++ = chain;
452 }
1f7bba79
JB		 453
454 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
455 /* ensure 2 byte alignment for the vendor field as required */
456 if ((pos - (u8 *)rthdr) & 1)
457 *pos++ = 0;
458 *pos++ = rtap.oui[0];
459 *pos++ = rtap.oui[1];
460 *pos++ = rtap.oui[2];
461 *pos++ = rtap.subns;
462 put_unaligned_le16(rtap.len, pos);
463 pos += 2;
464 /* align the actual payload as requested */
465 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
466 *pos++ = 0;
467 /* data (and possible padding) already follows */
468 }
601ae7f2
BR		 469}
470
b2e7771e
JB		 471/*
472 * This function copies a received frame to all monitor interfaces and
473 * returns a cleaned-up SKB that no longer includes the FCS nor the
474 * radiotap header the driver might have added.
475 */
476static struct sk_buff *
477ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 478 struct ieee80211_rate *rate)
b2e7771e 479{
f1d58c25 480 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 481 struct ieee80211_sub_if_data *sdata;
1f7bba79 482 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 483 struct sk_buff *skb, *skb2;
484 struct net_device *prev_dev = NULL;
485 int present_fcs_len = 0;
1f7bba79
JB		 486 unsigned int rtap_vendor_space = 0;
487
488 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
489 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
490
491 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
492 }
b2e7771e
JB		 493
494 /*
495 * First, we may need to make a copy of the skb because
496 * (1) we need to modify it for radiotap (if not present), and
497 * (2) the other RX handlers will modify the skb we got.
498 *
499 * We don't need to, of course, if we aren't going to return
500 * the SKB because it has a bad FCS/PLCP checksum.
501 */
0869aea0 502
30686bf7 503 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
b2e7771e
JB		 504 present_fcs_len = FCS_LEN;
505
1f7bba79
JB		 506 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
507 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 508 dev_kfree_skb(origskb);
509 return NULL;
510 }
511
17883048 512 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
1f7bba79
JB		 513 if (should_drop_frame(origskb, present_fcs_len,
514 rtap_vendor_space)) {
b2e7771e
JB		 515 dev_kfree_skb(origskb);
516 return NULL;
517 }
518
1f7bba79 519 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 520 }
521
751413ea 522 /* room for the radiotap header based on driver features */
1f7bba79
JB		 523 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
524 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 525
1f7bba79 526 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 527 /* only need to expand headroom if necessary */
528 skb = origskb;
529 origskb = NULL;
530
531 /*
532 * This shouldn't trigger often because most devices have an
533 * RX header they pull before we get here, and that should
534 * be big enough for our radiotap information. We should
535 * probably export the length to drivers so that we can have
536 * them allocate enough headroom to start with.
537 */
538 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 539 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 540 dev_kfree_skb(skb);
541 return NULL;
542 }
543 } else {
544 /*
545 * Need to make a copy and possibly remove radiotap header
546 * and FCS from the original.
547 */
548 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
549
1f7bba79
JB		 550 origskb = remove_monitor_info(local, origskb,
551 rtap_vendor_space);
b2e7771e
JB		 552
553 if (!skb)
554 return origskb;
555 }
556
0869aea0 557 /* prepend radiotap information */
1f7bba79 558 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 559
ce3edf6d 560 skb_reset_mac_header(skb);
b2e7771e
JB		 561 skb->ip_summed = CHECKSUM_UNNECESSARY;
562 skb->pkt_type = PACKET_OTHERHOST;
563 skb->protocol = htons(ETH_P_802_2);
564
565 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 566 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 567 continue;
568
3d30d949
MW		 569 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
570 continue;
571
9607e6b6 572 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 573 continue;
574
b2e7771e
JB		 575 if (prev_dev) {
576 skb2 = skb_clone(skb, GFP_ATOMIC);
577 if (skb2) {
578 skb2->dev = prev_dev;
5548a8a1 579 netif_receive_skb(skb2);
b2e7771e
JB		 580 }
581 }
582
583 prev_dev = sdata->dev;
5a490510 584 ieee80211_rx_stats(sdata->dev, skb->len);
b2e7771e
JB		 585 }
586
587 if (prev_dev) {
588 skb->dev = prev_dev;
5548a8a1 589 netif_receive_skb(skb);
b2e7771e
JB		 590 } else
591 dev_kfree_skb(skb);
592
593 return origskb;
594}
595
5cf121c3 596static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 597{
238f74a2 598 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 599 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 600 int tid, seqno_idx, security_idx;
6e0d114d
JB		 601
602 /* does the frame have a qos control field? */
238f74a2
HH		 603 if (ieee80211_is_data_qos(hdr->frame_control)) {
604 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 605 /* frame has qos control */
238f74a2 606 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 607 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 608 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 609
610 seqno_idx = tid;
611 security_idx = tid;
6e0d114d 612 } else {
1411f9b5
JB		 613 /*
614 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
615 *
616 * Sequence numbers for management frames, QoS data
617 * frames with a broadcast/multicast address in the
618 * Address 1 field, and all non-QoS data frames sent
619 * by QoS STAs are assigned using an additional single
620 * modulo-4096 counter, [...]
621 *
622 * We also use that counter for non-QoS STAs.
623 */
5a306f58 624 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 625 security_idx = 0;
626 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 627 security_idx = IEEE80211_NUM_TIDS;
9e26297a 628 tid = 0;
6e0d114d 629 }
52865dfd 630
9e26297a
JB		 631 rx->seqno_idx = seqno_idx;
632 rx->security_idx = security_idx;
6e0d114d
JB		 633 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
634 * For now, set skb->priority to 0 for other cases. */
635 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 636}
6e0d114d 637
d1c3a37c
JB		 638/**
639 * DOC: Packet alignment
640 *
641 * Drivers always need to pass packets that are aligned to two-byte boundaries
642 * to the stack.
643 *
644 * Additionally, should, if possible, align the payload data in a way that
645 * guarantees that the contained IP header is aligned to a four-byte
646 * boundary. In the case of regular frames, this simply means aligning the
647 * payload to a four-byte boundary (because either the IP header is directly
648 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 649 * in front of it). If the payload data is not properly aligned and the
650 * architecture doesn't support efficient unaligned operations, mac80211
651 * will align the data.
d1c3a37c
JB		 652 *
653 * With A-MSDU frames, however, the payload data address must yield two modulo
654 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
655 * push the IP header further back to a multiple of four again. Thankfully, the
656 * specs were sane enough this time around to require padding each A-MSDU
657 * subframe to a length that is a multiple of four.
658 *
25985edc 659 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 660 * the payload is not supported, the driver is required to move the 802.11
661 * header to be directly in front of the payload in that case.
662 */
663static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 664{
59d9cb07 665#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 666 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 667#endif
6e0d114d
JB		 668}
669
6368e4b1 670
571ecf67
JB		 671/* rx handlers */
672
3cfcf6ac
JM		 673static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
674{
675 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
676
d8ca16db 677 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 678 return 0;
679
d8ca16db 680 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 681}
682
683
684static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
685{
686 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
687
d8ca16db 688 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 689 return 0;
690
d8ca16db 691 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 692}
693
694
695/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
696static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
697{
698 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
699 struct ieee80211_mmie *mmie;
56c52da2 700 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 701
1df332e8 702 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 703 return -1;
704
d8ca16db 705 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 706 return -1; /* not a robust management frame */
707
708 mmie = (struct ieee80211_mmie *)
709 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 710 if (mmie->element_id == WLAN_EID_MMIE &&
711 mmie->length == sizeof(*mmie) - 2)
712 return le16_to_cpu(mmie->key_id);
713
714 mmie16 = (struct ieee80211_mmie_16 *)
715 (skb->data + skb->len - sizeof(*mmie16));
716 if (skb->len >= 24 + sizeof(*mmie16) &&
717 mmie16->element_id == WLAN_EID_MMIE &&
718 mmie16->length == sizeof(*mmie16) - 2)
719 return le16_to_cpu(mmie16->key_id);
720
721 return -1;
3cfcf6ac
JM		 722}
723
2475b1cc
MS		 724static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
725 struct sk_buff *skb)
726{
727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
728 __le16 fc;
729 int hdrlen;
730 u8 keyid;
731
732 fc = hdr->frame_control;
733 hdrlen = ieee80211_hdrlen(fc);
734
735 if (skb->len < hdrlen + cs->hdr_len)
736 return -EINVAL;
737
738 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
739 keyid &= cs->key_idx_mask;
740 keyid >>= cs->key_idx_shift;
741
742 return keyid;
743}
744
1df332e8 745static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 746{
a7767f95 747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 748 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 749
a7767f95 750 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 751 if (is_multicast_ether_addr(hdr->addr1)) {
752 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 753 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 754 return RX_DROP_MONITOR;
b203ca39 755 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 756 return RX_DROP_MONITOR;
757 } else {
758 if (!ieee80211_has_a4(hdr->frame_control))
759 return RX_DROP_MONITOR;
b203ca39 760 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 761 return RX_DROP_MONITOR;
762 }
33b64eb2
LCC		 763 }
764
765 /* If there is not an established peer link and this is not a peer link
766 * establisment frame, beacon or probe, drop the frame.
767 */
768
57cf8043 769 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 770 struct ieee80211_mgmt *mgmt;
d6d1a5a7 771
a7767f95 772 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 773 return RX_DROP_MONITOR;
774
a7767f95 775 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 776 u8 category;
9b395bc3
JB		 777
778 /* make sure category field is present */
779 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
780 return RX_DROP_MONITOR;
781
33b64eb2 782 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 783 category = mgmt->u.action.category;
784 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 785 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 786 return RX_DROP_MONITOR;
33b64eb2 787 return RX_CONTINUE;
33b64eb2
LCC		 788 }
789
a7767f95
HH		 790 if (ieee80211_is_probe_req(hdr->frame_control) ||
791 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 792 ieee80211_is_beacon(hdr->frame_control) ||
793 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 794 return RX_CONTINUE;
795
796 return RX_DROP_MONITOR;
a7767f95
HH		 797 }
798
902acc78
JB		 799 return RX_CONTINUE;
800}
33b64eb2 801
fb4ea054
JB		 802static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
803 int index)
804{
805 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
806 struct sk_buff *tail = skb_peek_tail(frames);
807 struct ieee80211_rx_status *status;
808
809 if (!tail)
810 return false;
811
812 status = IEEE80211_SKB_RXCB(tail);
813 if (status->flag & RX_FLAG_AMSDU_MORE)
814 return false;
815
816 return true;
817}
818
d3b2fb53 819static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 820 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 821 int index,
822 struct sk_buff_head *frames)
1edfb1af 823{
83eb935e
MK		 824 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
825 struct sk_buff *skb;
4cfda47b 826 struct ieee80211_rx_status *status;
1edfb1af 827
dd318575
JB		 828 lockdep_assert_held(&tid_agg_rx->reorder_lock);
829
83eb935e 830 if (skb_queue_empty(skb_list))
1edfb1af
JB		 831 goto no_frame;
832
fb4ea054 833 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
83eb935e
MK		 834 __skb_queue_purge(skb_list);
835 goto no_frame;
836 }
837
838 /* release frames from the reorder ring buffer */
1edfb1af 839 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 840 while ((skb = __skb_dequeue(skb_list))) {
841 status = IEEE80211_SKB_RXCB(skb);
842 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
843 __skb_queue_tail(frames, skb);
844 }
1edfb1af
JB		 845
846no_frame:
9a886586 847 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 848}
849
d3b2fb53 850static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 851 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 852 u16 head_seq_num,
853 struct sk_buff_head *frames)
1edfb1af
JB		 854{
855 int index;
856
dd318575
JB		 857 lockdep_assert_held(&tid_agg_rx->reorder_lock);
858
9a886586 859 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 860 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 861 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
862 frames);
1edfb1af
JB		 863 }
864}
865
866/*
867 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
868 * the skb was added to the buffer longer than this time ago, the earlier
869 * frames that have not yet been received are assumed to be lost and the skb
870 * can be released for processing. This may also release other skb's from the
871 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 872 *
873 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 874 */
875#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
876
d3b2fb53 877static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 878 struct tid_ampdu_rx *tid_agg_rx,
879 struct sk_buff_head *frames)
aa0c8636 880{
83eb935e 881 int index, i, j;
aa0c8636 882
dd318575
JB		 883 lockdep_assert_held(&tid_agg_rx->reorder_lock);
884
aa0c8636 885 /* release the buffer until next missing frame */
2e3049b7 886 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
fb4ea054 887 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
07ae2dfc 888 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 889 /*
890 * No buffers ready to be released, but check whether any
891 * frames in the reorder buffer have timed out.
892 */
aa0c8636
CL		 893 int skipped = 1;
894 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
895 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 896 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
aa0c8636
CL		 897 skipped++;
898 continue;
899 }
499fe9a4
DH		 900 if (skipped &&
901 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 902 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 903 goto set_release_timer;
aa0c8636 904
83eb935e
MK		 905 /* don't leave incomplete A-MSDUs around */
906 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
907 i = (i + 1) % tid_agg_rx->buf_size)
908 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
909
bdcbd8e0
JB		 910 ht_dbg_ratelimited(sdata,
911 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 912 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
913 frames);
aa0c8636
CL		 914
915 /*
916 * Increment the head seq# also for the skipped slots.
917 */
918 tid_agg_rx->head_seq_num =
9a886586
JB		 919 (tid_agg_rx->head_seq_num +
920 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 921 skipped = 0;
922 }
fb4ea054 923 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
f9e124fb
CL		 924 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
925 frames);
2e3049b7 926 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 927 }
2bff8ebf
CL		 928
929 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 930 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 931
932 for (; j != (index - 1) % tid_agg_rx->buf_size;
933 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 934 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
2bff8ebf
CL		 935 break;
936 }
937
938 set_release_timer:
939
788211d8
JB		 940 if (!tid_agg_rx->removed)
941 mod_timer(&tid_agg_rx->reorder_timer,
942 tid_agg_rx->reorder_time[j] + 1 +
943 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 944 } else {
945 del_timer(&tid_agg_rx->reorder_timer);
946 }
aa0c8636
CL		 947}
948
1edfb1af
JB		 949/*
950 * As this function belongs to the RX path it must be under
951 * rcu_read_lock protection. It returns false if the frame
952 * can be processed immediately, true if it was consumed.
953 */
d3b2fb53 954static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 955 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 956 struct sk_buff *skb,
957 struct sk_buff_head *frames)
1edfb1af
JB		 958{
959 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 960 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 961 u16 sc = le16_to_cpu(hdr->seq_ctrl);
962 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
963 u16 head_seq_num, buf_size;
964 int index;
2bff8ebf 965 bool ret = true;
1edfb1af 966
dd318575
JB		 967 spin_lock(&tid_agg_rx->reorder_lock);
968
4549cf2b
MK		 969 /*
970 * Offloaded BA sessions have no known starting sequence number so pick
971 * one from first Rxed frame for this tid after BA was started.
972 */
973 if (unlikely(tid_agg_rx->auto_seq)) {
974 tid_agg_rx->auto_seq = false;
975 tid_agg_rx->ssn = mpdu_seq_num;
976 tid_agg_rx->head_seq_num = mpdu_seq_num;
977 }
978
1edfb1af
JB		 979 buf_size = tid_agg_rx->buf_size;
980 head_seq_num = tid_agg_rx->head_seq_num;
981
982 /* frame with out of date sequence number */
9a886586 983 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 984 dev_kfree_skb(skb);
2bff8ebf 985 goto out;
1edfb1af
JB		 986 }
987
988 /*
989 * If frame the sequence number exceeds our buffering window
990 * size release some previous frames to make room for this one.
991 */
9a886586
JB		 992 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
993 head_seq_num = ieee80211_sn_inc(
994 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 995 /* release stored frames up to new head to stack */
d3b2fb53 996 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 997 head_seq_num, frames);
1edfb1af
JB		 998 }
999
1000 /* Now the new frame is always in the range of the reordering buffer */
1001
2e3049b7 1002 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 1003
1004 /* check if we already stored this frame */
fb4ea054 1005 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1edfb1af 1006 dev_kfree_skb(skb);
2bff8ebf 1007 goto out;
1edfb1af
JB		 1008 }
1009
1010 /*
1011 * If the current MPDU is in the right order and nothing else
1012 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 1013 * If it is first but there's something stored, we may be able
1014 * to release frames after this one.
1edfb1af
JB		 1015 */
1016 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1017 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1018 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1019 tid_agg_rx->head_seq_num =
1020 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1021 ret = false;
1022 goto out;
1edfb1af
JB		 1023 }
1024
1025 /* put the frame in the reordering buffer */
83eb935e
MK		 1026 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1027 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1028 tid_agg_rx->reorder_time[index] = jiffies;
1029 tid_agg_rx->stored_mpdu_num++;
1030 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1031 }
1edfb1af 1032
2bff8ebf
CL		 1033 out:
1034 spin_unlock(&tid_agg_rx->reorder_lock);
1035 return ret;
1edfb1af
JB		 1036}
1037
1038/*
1039 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1040 * true if the MPDU was buffered, false if it should be processed.
1041 */
f9e124fb
CL		 1042static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1043 struct sk_buff_head *frames)
1edfb1af 1044{
2569a826
JB		 1045 struct sk_buff *skb = rx->skb;
1046 struct ieee80211_local *local = rx->local;
1edfb1af 1047 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1048 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1049 struct tid_ampdu_rx *tid_agg_rx;
1050 u16 sc;
6cc00d54 1051 u8 tid, ack_policy;
1edfb1af 1052
051a41fa
JB		 1053 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1054 is_multicast_ether_addr(hdr->addr1))
2569a826 1055 goto dont_reorder;
1edfb1af
JB		 1056
1057 /*
1058 * filter the QoS data rx stream according to
1059 * STA/TID and check if this STA/TID is on aggregation
1060 */
1061
1edfb1af 1062 if (!sta)
2569a826 1063 goto dont_reorder;
1edfb1af 1064
6cc00d54
TP		 1065 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1066 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1067 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1068
a87f736d
JB		 1069 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1070 if (!tid_agg_rx)
1071 goto dont_reorder;
1edfb1af
JB		 1072
1073 /* qos null data frames are excluded */
1074 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1075 goto dont_reorder;
1edfb1af 1076
6cc00d54
TP		 1077 /* not part of a BA session */
1078 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1079 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1080 goto dont_reorder;
1081
1edfb1af
JB		 1082 /* new, potentially un-ordered, ampdu frame - process it */
1083
1084 /* reset session timer */
1085 if (tid_agg_rx->timeout)
12d3952f 1086 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1087
1088 /* if this mpdu is fragmented - terminate rx aggregation session */
1089 sc = le16_to_cpu(hdr->seq_ctrl);
1090 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1091 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1092 skb_queue_tail(&rx->sdata->skb_queue, skb);
1093 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1094 return;
1edfb1af
JB		 1095 }
1096
a87f736d
JB		 1097 /*
1098 * No locking needed -- we will only ever process one
1099 * RX packet at a time, and thus own tid_agg_rx. All
1100 * other code manipulating it needs to (and does) make
1101 * sure that we cannot get to it any more before doing
1102 * anything with it.
1103 */
f9e124fb
CL		 1104 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1105 frames))
2569a826
JB		 1106 return;
1107
1108 dont_reorder:
f9e124fb 1109 __skb_queue_tail(frames, skb);
1edfb1af 1110}
33b64eb2 1111
49461622 1112static ieee80211_rx_result debug_noinline
0395442a 1113ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1114{
a7767f95 1115 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1117
f9cfa5f3
SS		 1118 if (status->flag & RX_FLAG_DUP_VALIDATED)
1119 return RX_CONTINUE;
1120
6b0f3274
JB		 1121 /*
1122 * Drop duplicate 802.11 retransmissions
1123 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1124 */
0395442a
JB		 1125
1126 if (rx->skb->len < 24)
1127 return RX_CONTINUE;
1128
1129 if (ieee80211_is_ctl(hdr->frame_control) ||
1130 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1131 is_multicast_ether_addr(hdr->addr1))
1132 return RX_CONTINUE;
1133
a732fa70
JB		 1134 if (!rx->sta)
1135 return RX_CONTINUE;
1136
1137 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1138 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1139 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1140 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1141 return RX_DROP_UNUSABLE;
1142 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1143 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1144 }
1145
0395442a
JB		 1146 return RX_CONTINUE;
1147}
1148
1149static ieee80211_rx_result debug_noinline
1150ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1151{
1152 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1153
571ecf67
JB		 1154 /* Drop disallowed frame classes based on STA auth/assoc state;
1155 * IEEE 802.11, Chap 5.5.
1156 *
ccd7b362
JB		 1157 * mac80211 filters only based on association state, i.e. it drops
1158 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1159 * deauth/disassoc frames when needed. In addition, hostapd is
1160 * responsible for filtering on both auth and assoc states.
1161 */
33b64eb2 1162
902acc78 1163 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1164 return ieee80211_rx_mesh_check(rx);
33b64eb2 1165
a7767f95
HH		 1166 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1167 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1168 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1169 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1170 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1171 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1172 /*
1173 * accept port control frames from the AP even when it's not
1174 * yet marked ASSOC to prevent a race where we don't set the
1175 * assoc bit quickly enough before it sends the first frame
1176 */
1177 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1178 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1179 unsigned int hdrlen;
1180 __be16 ethertype;
1181
1182 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1183
1184 if (rx->skb->len < hdrlen + 8)
1185 return RX_DROP_MONITOR;
1186
1187 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1188 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1189 return RX_CONTINUE;
1190 }
21fc7560
JB		 1191
1192 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1193 cfg80211_rx_spurious_frame(rx->sdata->dev,
1194 hdr->addr2,
1195 GFP_ATOMIC))
1196 return RX_DROP_UNUSABLE;
1197
e4c26add 1198 return RX_DROP_MONITOR;
2a33bee2 1199 }
571ecf67 1200
9ae54c84 1201 return RX_CONTINUE;
570bd537
JB		 1202}
1203
1204
572e0012
KV		 1205static ieee80211_rx_result debug_noinline
1206ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1207{
1208 struct ieee80211_local *local;
1209 struct ieee80211_hdr *hdr;
1210 struct sk_buff *skb;
1211
1212 local = rx->local;
1213 skb = rx->skb;
1214 hdr = (struct ieee80211_hdr *) skb->data;
1215
1216 if (!local->pspolling)
1217 return RX_CONTINUE;
1218
1219 if (!ieee80211_has_fromds(hdr->frame_control))
1220 /* this is not from AP */
1221 return RX_CONTINUE;
1222
1223 if (!ieee80211_is_data(hdr->frame_control))
1224 return RX_CONTINUE;
1225
1226 if (!ieee80211_has_moredata(hdr->frame_control)) {
1227 /* AP has no more frames buffered for us */
1228 local->pspolling = false;
1229 return RX_CONTINUE;
1230 }
1231
1232 /* more data bit is set, let's request a new frame from the AP */
1233 ieee80211_send_pspoll(local, rx->sdata);
1234
1235 return RX_CONTINUE;
1236}
1237
d012a605 1238static void sta_ps_start(struct sta_info *sta)
571ecf67 1239{
133b8226 1240 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1241 struct ieee80211_local *local = sdata->local;
d012a605 1242 struct ps_data *ps;
ba8c3d6f 1243 int tid;
0795af57 1244
d012a605
MP		 1245 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1246 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1247 ps = &sdata->bss->ps;
1248 else
1249 return;
1250
1251 atomic_inc(&ps->num_sta_ps);
c2c98fde 1252 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1253 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1254 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1255 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1256 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1257
17c18bf8
JB		 1258 ieee80211_clear_fast_xmit(sta);
1259
ba8c3d6f
FF		 1260 if (!sta->sta.txq[0])
1261 return;
1262
1263 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1264 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1265
1266 if (!skb_queue_len(&txqi->queue))
1267 set_bit(tid, &sta->txq_buffered_tids);
1268 else
1269 clear_bit(tid, &sta->txq_buffered_tids);
1270 }
571ecf67
JB		 1271}
1272
d012a605 1273static void sta_ps_end(struct sta_info *sta)
571ecf67 1274{
bdcbd8e0
JB		 1275 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1276 sta->sta.addr, sta->sta.aid);
004c872e 1277
c2c98fde 1278 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1279 /*
1280 * Clear the flag only if the other one is still set
1281 * so that the TX path won't start TX'ing new frames
1282 * directly ... In the case that the driver flag isn't
1283 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1284 */
1285 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1286 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1287 sta->sta.addr, sta->sta.aid);
af818581
JB		 1288 return;
1289 }
1290
5ac2e350
JB		 1291 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1292 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1293 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1294}
1295
cf47161a 1296int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1297{
cf47161a 1298 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1299 bool in_ps;
1300
cf47161a 1301 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1302
1303 /* Don't let the same PS state be set twice */
cf47161a 1304 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1305 if ((start && in_ps) || (!start && !in_ps))
1306 return -EINVAL;
1307
1308 if (start)
cf47161a 1309 sta_ps_start(sta);
d057e5a3 1310 else
cf47161a 1311 sta_ps_end(sta);
d057e5a3
AN		 1312
1313 return 0;
1314}
1315EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1316
47086fc5
JB		 1317static ieee80211_rx_result debug_noinline
1318ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1319{
1320 struct ieee80211_sub_if_data *sdata = rx->sdata;
1321 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1322 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1323 int tid, ac;
1324
5c90067c 1325 if (!rx->sta)
47086fc5
JB		 1326 return RX_CONTINUE;
1327
1328 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1329 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1330 return RX_CONTINUE;
1331
1332 /*
1333 * The device handles station powersave, so don't do anything about
1334 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1335 * it to mac80211 since they're handled.)
1336 */
30686bf7 1337 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1338 return RX_CONTINUE;
1339
1340 /*
1341 * Don't do anything if the station isn't already asleep. In
1342 * the uAPSD case, the station will probably be marked asleep,
1343 * in the PS-Poll case the station must be confused ...
1344 */
c2c98fde 1345 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1346 return RX_CONTINUE;
1347
1348 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1349 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1350 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1351 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1352 else
c2c98fde 1353 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1354 }
47086fc5
JB		 1355
1356 /* Free PS Poll skb here instead of returning RX_DROP that would
1357 * count as an dropped frame. */
1358 dev_kfree_skb(rx->skb);
1359
1360 return RX_QUEUED;
1361 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1362 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1363 ieee80211_has_pm(hdr->frame_control) &&
1364 (ieee80211_is_data_qos(hdr->frame_control) ||
1365 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1366 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1367 ac = ieee802_1d_to_ac[tid & 7];
1368
1369 /*
1370 * If this AC is not trigger-enabled do nothing.
1371 *
1372 * NB: This could/should check a separate bitmap of trigger-
1373 * enabled queues, but for now we only implement uAPSD w/o
1374 * TSPEC changes to the ACs, so they're always the same.
1375 */
1376 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1377 return RX_CONTINUE;
1378
1379 /* if we are in a service period, do nothing */
c2c98fde 1380 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1381 return RX_CONTINUE;
1382
c2c98fde 1383 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1384 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1385 else
c2c98fde 1386 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1387 }
1388
1389 return RX_CONTINUE;
1390}
1391
49461622 1392static ieee80211_rx_result debug_noinline
5cf121c3 1393ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1394{
1395 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1396 struct sk_buff *skb = rx->skb;
1397 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1399 int i;
571ecf67
JB		 1400
1401 if (!sta)
9ae54c84 1402 return RX_CONTINUE;
571ecf67 1403
b291ba11
JB		 1404 /*
1405 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1406 * BSSID and for station already AUTHORIZED to avoid keeping the
1407 * current IBSS network alive in cases where other STAs start
1408 * using different BSSID. This will also give the station another
1409 * chance to restart the authentication/authorization in case
1410 * something went wrong the first time.
b291ba11 1411 */
05c914fe 1412 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1413 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1414 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1415 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1416 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1417 sta->rx_stats.last_rx = jiffies;
f4ebddf9
HR		 1418 if (ieee80211_is_data(hdr->frame_control) &&
1419 !is_multicast_ether_addr(hdr->addr1)) {
e5a9f8d0
JB		 1420 sta->rx_stats.last_rate_idx =
1421 status->rate_idx;
1422 sta->rx_stats.last_rate_flag =
1423 status->flag;
1424 sta->rx_stats.last_rate_vht_flag =
1425 status->vht_flag;
1426 sta->rx_stats.last_rate_vht_nss =
1427 status->vht_nss;
3af6334c
FF		 1428 }
1429 }
239281f8 1430 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1431 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1432 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1433 /*
33b64eb2
LCC		 1434 * Mesh beacons will update last_rx when if they are found to
1435 * match the current local configuration when processed.
571ecf67 1436 */
e5a9f8d0 1437 sta->rx_stats.last_rx = jiffies;
3af6334c 1438 if (ieee80211_is_data(hdr->frame_control)) {
e5a9f8d0
JB		 1439 sta->rx_stats.last_rate_idx = status->rate_idx;
1440 sta->rx_stats.last_rate_flag = status->flag;
1441 sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1442 sta->rx_stats.last_rate_vht_nss = status->vht_nss;
3af6334c 1443 }
571ecf67
JB		 1444 }
1445
3cf335d5
KV		 1446 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1447 ieee80211_sta_rx_notify(rx->sdata, hdr);
1448
e5a9f8d0
JB		 1449 sta->rx_stats.fragments++;
1450 sta->rx_stats.bytes += rx->skb->len;
fe8431f8 1451 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0
JB		 1452 sta->rx_stats.last_signal = status->signal;
1453 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
fe8431f8 1454 }
571ecf67 1455
ef0621e8 1456 if (status->chains) {
e5a9f8d0 1457 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1458 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1459 int signal = status->chain_signal[i];
1460
1461 if (!(status->chains & BIT(i)))
1462 continue;
1463
e5a9f8d0
JB		 1464 sta->rx_stats.chain_signal_last[i] = signal;
1465 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1466 -signal);
ef0621e8
FF		 1467 }
1468 }
1469
72eaa43a
JB		 1470 /*
1471 * Change STA power saving mode only at the end of a frame
1472 * exchange sequence.
1473 */
30686bf7 1474 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1475 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1476 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1477 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1478 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1479 /* PM bit is only checked in frames where it isn't reserved,
1480 * in AP mode it's reserved in non-bufferable management frames
1481 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1482 */
1483 (!ieee80211_is_mgmt(hdr->frame_control) ||
1484 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1485 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1486 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1487 sta_ps_end(sta);
72eaa43a
JB		 1488 } else {
1489 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1490 sta_ps_start(sta);
72eaa43a 1491 }
571ecf67
JB		 1492 }
1493
3f52b7e3
MP		 1494 /* mesh power save support */
1495 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1496 ieee80211_mps_rx_h_sta_process(sta, hdr);
1497
22403def
JB		 1498 /*
1499 * Drop (qos-)data::nullfunc frames silently, since they
1500 * are used only to control station power saving mode.
1501 */
1502 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1503 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1504 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1505
1506 /*
1507 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1508 * that was not moved to a 4-addr STA vlan yet send
1509 * the event to userspace and for older hostapd drop
1510 * the frame to the monitor interface.
d524215f
FF		 1511 */
1512 if (ieee80211_has_a4(hdr->frame_control) &&
1513 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1514 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1515 !rx->sdata->u.vlan.sta))) {
1516 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1517 cfg80211_rx_unexpected_4addr_frame(
1518 rx->sdata->dev, sta->sta.addr,
1519 GFP_ATOMIC);
d524215f 1520 return RX_DROP_MONITOR;
e7f4a940 1521 }
22403def
JB		 1522 /*
1523 * Update counter and free packet here to avoid
1524 * counting this as a dropped packed.
1525 */
e5a9f8d0 1526 sta->rx_stats.packets++;
571ecf67 1527 dev_kfree_skb(rx->skb);
9ae54c84 1528 return RX_QUEUED;
571ecf67
JB		 1529 }
1530
9ae54c84 1531 return RX_CONTINUE;
571ecf67
JB		 1532} /* ieee80211_rx_h_sta_process */
1533
86c228a7
JA		 1534static ieee80211_rx_result debug_noinline
1535ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1536{
1537 struct sk_buff *skb = rx->skb;
1538 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1539 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1540 int keyidx;
1541 int hdrlen;
1542 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1543 struct ieee80211_key *sta_ptk = NULL;
1544 int mmie_keyidx = -1;
1545 __le16 fc;
2475b1cc 1546 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1547
1548 /*
1549 * Key selection 101
1550 *
1551 * There are four types of keys:
1552 * - GTK (group keys)
1553 * - IGTK (group keys for management frames)
1554 * - PTK (pairwise keys)
1555 * - STK (station-to-station pairwise keys)
1556 *
1557 * When selecting a key, we have to distinguish between multicast
1558 * (including broadcast) and unicast frames, the latter can only
1559 * use PTKs and STKs while the former always use GTKs and IGTKs.
1560 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1561 * unicast frames can also use key indices like GTKs. Hence, if we
1562 * don't have a PTK/STK we check the key index for a WEP key.
1563 *
1564 * Note that in a regular BSS, multicast frames are sent by the
1565 * AP only, associated stations unicast the frame to the AP first
1566 * which then multicasts it on their behalf.
1567 *
1568 * There is also a slight problem in IBSS mode: GTKs are negotiated
1569 * with each station, that is something we don't currently handle.
1570 * The spec seems to expect that one negotiates the same key with
1571 * every station but there's no such requirement; VLANs could be
1572 * possible.
1573 */
1574
86c228a7
JA		 1575 /* start without a key */
1576 rx->key = NULL;
2475b1cc 1577 fc = hdr->frame_control;
86c228a7 1578
2475b1cc
MS		 1579 if (rx->sta) {
1580 int keyid = rx->sta->ptk_idx;
86c228a7 1581
2475b1cc
MS		 1582 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1583 cs = rx->sta->cipher_scheme;
1584 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1585 if (unlikely(keyid < 0))
1586 return RX_DROP_UNUSABLE;
1587 }
1588 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1589 }
86c228a7
JA		 1590
1591 if (!ieee80211_has_protected(fc))
1592 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1593
1594 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1595 rx->key = sta_ptk;
1596 if ((status->flag & RX_FLAG_DECRYPTED) &&
1597 (status->flag & RX_FLAG_IV_STRIPPED))
1598 return RX_CONTINUE;
1599 /* Skip decryption if the frame is not protected. */
1600 if (!ieee80211_has_protected(fc))
1601 return RX_CONTINUE;
1602 } else if (mmie_keyidx >= 0) {
1603 /* Broadcast/multicast robust management frame / BIP */
1604 if ((status->flag & RX_FLAG_DECRYPTED) &&
1605 (status->flag & RX_FLAG_IV_STRIPPED))
1606 return RX_CONTINUE;
1607
1608 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1609 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1610 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1611 if (rx->sta)
1612 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1613 if (!rx->key)
1614 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1615 } else if (!ieee80211_has_protected(fc)) {
1616 /*
1617 * The frame was not protected, so skip decryption. However, we
1618 * need to set rx->key if there is a key that could have been
1619 * used so that the frame may be dropped if encryption would
1620 * have been expected.
1621 */
1622 struct ieee80211_key *key = NULL;
1623 struct ieee80211_sub_if_data *sdata = rx->sdata;
1624 int i;
1625
1626 if (ieee80211_is_mgmt(fc) &&
1627 is_multicast_ether_addr(hdr->addr1) &&
1628 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1629 rx->key = key;
1630 else {
1631 if (rx->sta) {
1632 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1633 key = rcu_dereference(rx->sta->gtk[i]);
1634 if (key)
1635 break;
1636 }
1637 }
1638 if (!key) {
1639 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1640 key = rcu_dereference(sdata->keys[i]);
1641 if (key)
1642 break;
1643 }
1644 }
1645 if (key)
1646 rx->key = key;
1647 }
1648 return RX_CONTINUE;
1649 } else {
1650 u8 keyid;
2475b1cc 1651
86c228a7
JA		 1652 /*
1653 * The device doesn't give us the IV so we won't be
1654 * able to look up the key. That's ok though, we
1655 * don't need to decrypt the frame, we just won't
1656 * be able to keep statistics accurate.
1657 * Except for key threshold notifications, should
1658 * we somehow allow the driver to tell us which key
1659 * the hardware used if this flag is set?
1660 */
1661 if ((status->flag & RX_FLAG_DECRYPTED) &&
1662 (status->flag & RX_FLAG_IV_STRIPPED))
1663 return RX_CONTINUE;
1664
1665 hdrlen = ieee80211_hdrlen(fc);
1666
2475b1cc
MS		 1667 if (cs) {
1668 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1669
2475b1cc
MS		 1670 if (unlikely(keyidx < 0))
1671 return RX_DROP_UNUSABLE;
1672 } else {
1673 if (rx->skb->len < 8 + hdrlen)
1674 return RX_DROP_UNUSABLE; /* TODO: count this? */
1675 /*
1676 * no need to call ieee80211_wep_get_keyidx,
1677 * it verifies a bunch of things we've done already
1678 */
1679 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1680 keyidx = keyid >> 6;
1681 }
86c228a7
JA		 1682
1683 /* check per-station GTK first, if multicast packet */
1684 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1685 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1686
1687 /* if not found, try default key */
1688 if (!rx->key) {
1689 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1690
1691 /*
1692 * RSNA-protected unicast frames should always be
1693 * sent with pairwise or station-to-station keys,
1694 * but for WEP we allow using a key index as well.
1695 */
1696 if (rx->key &&
1697 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1698 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1699 !is_multicast_ether_addr(hdr->addr1))
1700 rx->key = NULL;
1701 }
1702 }
1703
1704 if (rx->key) {
1705 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1706 return RX_DROP_MONITOR;
1707
86c228a7
JA		 1708 /* TODO: add threshold stuff again */
1709 } else {
1710 return RX_DROP_MONITOR;
1711 }
1712
1713 switch (rx->key->conf.cipher) {
1714 case WLAN_CIPHER_SUITE_WEP40:
1715 case WLAN_CIPHER_SUITE_WEP104:
1716 result = ieee80211_crypto_wep_decrypt(rx);
1717 break;
1718 case WLAN_CIPHER_SUITE_TKIP:
1719 result = ieee80211_crypto_tkip_decrypt(rx);
1720 break;
1721 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1722 result = ieee80211_crypto_ccmp_decrypt(
1723 rx, IEEE80211_CCMP_MIC_LEN);
1724 break;
1725 case WLAN_CIPHER_SUITE_CCMP_256:
1726 result = ieee80211_crypto_ccmp_decrypt(
1727 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1728 break;
1729 case WLAN_CIPHER_SUITE_AES_CMAC:
1730 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1731 break;
56c52da2
JM		 1732 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1733 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1734 break;
8ade538b
JM		 1735 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1736 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1737 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1738 break;
00b9cfa3
JM		 1739 case WLAN_CIPHER_SUITE_GCMP:
1740 case WLAN_CIPHER_SUITE_GCMP_256:
1741 result = ieee80211_crypto_gcmp_decrypt(rx);
1742 break;
86c228a7 1743 default:
2475b1cc 1744 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1745 }
1746
1747 /* the hdr variable is invalid after the decrypt handlers */
1748
1749 /* either the frame has been decrypted or will be dropped */
1750 status->flag |= RX_FLAG_DECRYPTED;
1751
1752 return result;
1753}
1754
571ecf67
JB		 1755static inline struct ieee80211_fragment_entry *
1756ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1757 unsigned int frag, unsigned int seq, int rx_queue,
1758 struct sk_buff **skb)
1759{
1760 struct ieee80211_fragment_entry *entry;
571ecf67 1761
571ecf67
JB		 1762 entry = &sdata->fragments[sdata->fragment_next++];
1763 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1764 sdata->fragment_next = 0;
1765
bdcbd8e0 1766 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1767 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1768
1769 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1770 *skb = NULL;
1771 entry->first_frag_time = jiffies;
1772 entry->seq = seq;
1773 entry->rx_queue = rx_queue;
1774 entry->last_frag = frag;
1775 entry->ccmp = 0;
1776 entry->extra_len = 0;
1777
1778 return entry;
1779}
1780
1781static inline struct ieee80211_fragment_entry *
1782ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1783 unsigned int frag, unsigned int seq,
571ecf67
JB		 1784 int rx_queue, struct ieee80211_hdr *hdr)
1785{
1786 struct ieee80211_fragment_entry *entry;
1787 int i, idx;
1788
1789 idx = sdata->fragment_next;
1790 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1791 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1792
1793 idx--;
1794 if (idx < 0)
1795 idx = IEEE80211_FRAGMENT_MAX - 1;
1796
1797 entry = &sdata->fragments[idx];
1798 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1799 entry->rx_queue != rx_queue ||
1800 entry->last_frag + 1 != frag)
1801 continue;
1802
b73d70ad 1803 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1804
b73d70ad
HH		 1805 /*
1806 * Check ftype and addresses are equal, else check next fragment
1807 */
1808 if (((hdr->frame_control ^ f_hdr->frame_control) &
1809 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1810 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1811 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1812 continue;
1813
ab46623e 1814 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1815 __skb_queue_purge(&entry->skb_list);
1816 continue;
1817 }
1818 return entry;
1819 }
1820
1821 return NULL;
1822}
1823
49461622 1824static ieee80211_rx_result debug_noinline
5cf121c3 1825ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1826{
1827 struct ieee80211_hdr *hdr;
1828 u16 sc;
358c8d9d 1829 __le16 fc;
571ecf67
JB		 1830 unsigned int frag, seq;
1831 struct ieee80211_fragment_entry *entry;
1832 struct sk_buff *skb;
554891e6 1833 struct ieee80211_rx_status *status;
571ecf67 1834
b73d70ad 1835 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1836 fc = hdr->frame_control;
f7fbf70e
JC		 1837
1838 if (ieee80211_is_ctl(fc))
1839 return RX_CONTINUE;
1840
571ecf67
JB		 1841 sc = le16_to_cpu(hdr->seq_ctrl);
1842 frag = sc & IEEE80211_SCTL_FRAG;
1843
b8fff407 1844 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 1845 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 1846 goto out_no_led;
571ecf67 1847 }
b8fff407 1848
d025933e
AM		 1849 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1850 goto out;
1851
571ecf67
JB		 1852 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1853
e3cf8b3f
ZY		 1854 if (skb_linearize(rx->skb))
1855 return RX_DROP_UNUSABLE;
1856
058897a4
AK		 1857 /*
1858 * skb_linearize() might change the skb->data and
1859 * previously cached variables (in this case, hdr) need to
1860 * be refreshed with the new data.
1861 */
1862 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1863 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1864
1865 if (frag == 0) {
1866 /* This is the first fragment of a new frame. */
1867 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1868 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 1869 if (rx->key &&
1870 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1871 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
358c8d9d 1872 ieee80211_has_protected(fc)) {
9e26297a 1873 int queue = rx->security_idx;
571ecf67
JB		 1874 /* Store CCMP PN so that we can verify that the next
1875 * fragment has a sequential PN value. */
1876 entry->ccmp = 1;
1877 memcpy(entry->last_pn,
9190252c 1878 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1879 IEEE80211_CCMP_PN_LEN);
571ecf67 1880 }
9ae54c84 1881 return RX_QUEUED;
571ecf67
JB		 1882 }
1883
1884 /* This is a fragment for a frame that should already be pending in
1885 * fragment cache. Add this fragment to the end of the pending entry.
1886 */
9e26297a
JB		 1887 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1888 rx->seqno_idx, hdr);
571ecf67
JB		 1889 if (!entry) {
1890 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1891 return RX_DROP_MONITOR;
571ecf67
JB		 1892 }
1893
1894 /* Verify that MPDUs within one MSDU have sequential PN values.
1895 * (IEEE 802.11i, 8.3.3.4.5) */
1896 if (entry->ccmp) {
1897 int i;
4325f6ca 1898 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1899 int queue;
2b2ba0db
JM		 1900 if (!rx->key ||
1901 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1902 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
e4c26add 1903 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1904 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1905 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1906 pn[i]++;
1907 if (pn[i])
1908 break;
1909 }
9e26297a 1910 queue = rx->security_idx;
9190252c 1911 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1912 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1913 return RX_DROP_UNUSABLE;
4325f6ca 1914 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1915 }
1916
358c8d9d 1917 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1918 __skb_queue_tail(&entry->skb_list, rx->skb);
1919 entry->last_frag = frag;
1920 entry->extra_len += rx->skb->len;
358c8d9d 1921 if (ieee80211_has_morefrags(fc)) {
571ecf67 1922 rx->skb = NULL;
9ae54c84 1923 return RX_QUEUED;
571ecf67
JB		 1924 }
1925
1926 rx->skb = __skb_dequeue(&entry->skb_list);
1927 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 1928 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 1929 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1930 GFP_ATOMIC))) {
1931 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1932 __skb_queue_purge(&entry->skb_list);
e4c26add 1933 return RX_DROP_UNUSABLE;
571ecf67
JB		 1934 }
1935 }
1936 while ((skb = __skb_dequeue(&entry->skb_list))) {
1937 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1938 dev_kfree_skb(skb);
1939 }
1940
1941 /* Complete frame has been reassembled - process it now */
554891e6 1942 status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 1943
1944 out:
d025933e
AM		 1945 ieee80211_led_rx(rx->local);
1946 out_no_led:
571ecf67 1947 if (rx->sta)
e5a9f8d0 1948 rx->sta->rx_stats.packets++;
9ae54c84 1949 return RX_CONTINUE;
571ecf67
JB		 1950}
1951
1df332e8 1952static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1953{
1df332e8 1954 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1955 return -EACCES;
571ecf67 1956
76ee65bf 1957 return 0;
571ecf67
JB		 1958}
1959
1df332e8 1960static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1961{
eb9fb5b8
JB		 1962 struct sk_buff *skb = rx->skb;
1963 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1964
3017b80b 1965 /*
7848ba7d
JB		 1966 * Pass through unencrypted frames if the hardware has
1967 * decrypted them already.
3017b80b 1968 */
eb9fb5b8 1969 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1970 return 0;
571ecf67
JB		 1971
1972 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1973 if (unlikely(!ieee80211_has_protected(fc) &&
1974 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 1975 ieee80211_is_data(fc) && rx->key))
76ee65bf 1976 return -EACCES;
bef5d1c7
JB		 1977
1978 return 0;
1979}
1980
1df332e8 1981static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1982{
1983 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1984 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1985 __le16 fc = hdr->frame_control;
bef5d1c7 1986
e3efca0a
JM		 1987 /*
1988 * Pass through unencrypted frames if the hardware has
1989 * decrypted them already.
1990 */
1991 if (status->flag & RX_FLAG_DECRYPTED)
1992 return 0;
bef5d1c7 1993
c2c98fde 1994 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1995 if (unlikely(!ieee80211_has_protected(fc) &&
1996 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1997 rx->key)) {
6ff57cf8
JB		 1998 if (ieee80211_is_deauth(fc) ||
1999 ieee80211_is_disassoc(fc))
2000 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2001 rx->skb->data,
2002 rx->skb->len);
f2ca3ea4 2003 return -EACCES;
cf4e594e 2004 }
f2ca3ea4 2005 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2006 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2007 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2008 if (ieee80211_is_deauth(fc) ||
2009 ieee80211_is_disassoc(fc))
2010 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2011 rx->skb->data,
2012 rx->skb->len);
f2ca3ea4 2013 return -EACCES;
cf4e594e 2014 }
f2ca3ea4
JM		 2015 /*
2016 * When using MFP, Action frames are not allowed prior to
2017 * having configured keys.
2018 */
2019 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2020 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2021 return -EACCES;
2022 }
b3fc9c6c 2023
76ee65bf 2024 return 0;
571ecf67
JB		 2025}
2026
76ee65bf 2027static int
4114fa21 2028__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2029{
eb9fb5b8 2030 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2031 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2032 bool check_port_control = false;
2033 struct ethhdr *ehdr;
2034 int ret;
f14543ee 2035
4114fa21 2036 *port_control = false;
9bc383de
JB		 2037 if (ieee80211_has_a4(hdr->frame_control) &&
2038 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2039 return -1;
9bc383de 2040
fbb327c5
FF		 2041 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2042 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2043
2044 if (!sdata->u.mgd.use_4addr)
2045 return -1;
2046 else
2047 check_port_control = true;
2048 }
2049
9bc383de 2050 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2051 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2052 return -1;
571ecf67 2053
fbb327c5 2054 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2055 if (ret < 0)
fbb327c5
FF		 2056 return ret;
2057
2058 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2059 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2060 *port_control = true;
2061 else if (check_port_control)
fbb327c5
FF		 2062 return -1;
2063
2064 return 0;
76ee65bf 2065}
571ecf67 2066
ce3edf6d
JB		 2067/*
2068 * requires that rx->skb is a frame with ethernet header
2069 */
358c8d9d 2070static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2071{
c97c23e3 2072 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2073 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2074 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2075
2076 /*
2077 * Allow EAPOL frames to us/the PAE group address regardless
2078 * of whether the frame was encrypted or not.
2079 */
a621fa4d 2080 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2081 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2082 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2083 return true;
2084
2085 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2086 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2087 return false;
2088
2089 return true;
2090}
2091
2092/*
2093 * requires that rx->skb is a frame with ethernet header
2094 */
76ee65bf 2095static void
5cf121c3 2096ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2097{
eb9fb5b8
JB		 2098 struct ieee80211_sub_if_data *sdata = rx->sdata;
2099 struct net_device *dev = sdata->dev;
76ee65bf 2100 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2101 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2102 struct sta_info *dsta;
571ecf67 2103
76ee65bf
RR		 2104 skb = rx->skb;
2105 xmit_skb = NULL;
571ecf67 2106
5a490510
JB		 2107 ieee80211_rx_stats(dev, skb->len);
2108
05c914fe
JB		 2109 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2110 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2111 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2112 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2113 if (is_multicast_ether_addr(ehdr->h_dest)) {
2114 /*
2115 * send multicast frames both to higher layers in
2116 * local net stack and back to the wireless medium
2117 */
76ee65bf 2118 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2119 if (!xmit_skb)
bdcbd8e0 2120 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2121 dev->name);
571ecf67 2122 } else {
abe60632
JB		 2123 dsta = sta_info_get(sdata, skb->data);
2124 if (dsta) {
ce3edf6d
JB		 2125 /*
2126 * The destination station is associated to
2127 * this AP (in this VLAN), so send the frame
2128 * directly to it and do not pass it to local
2129 * net stack.
571ecf67 2130 */
76ee65bf 2131 xmit_skb = skb;
571ecf67
JB		 2132 skb = NULL;
2133 }
571ecf67
JB		 2134 }
2135 }
2136
59d9cb07 2137#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2138 if (skb) {
2139 /* 'align' will only take the values 0 or 2 here since all
2140 * frames are required to be aligned to 2-byte boundaries
2141 * when being passed to mac80211; the code here works just
2142 * as well if that isn't true, but mac80211 assumes it can
2143 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2144 */
9e890a1f
JB		 2145 int align;
2146
2147 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2148 if (align) {
2149 if (WARN_ON(skb_headroom(skb) < 3)) {
2150 dev_kfree_skb(skb);
2151 skb = NULL;
2152 } else {
2153 u8 *data = skb->data;
8ce0b589
ZY		 2154 size_t len = skb_headlen(skb);
2155 skb->data -= align;
2156 memmove(skb->data, data, len);
2157 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2158 }
2159 }
9e890a1f 2160 }
d1c3a37c
JB		 2161#endif
2162
9e890a1f
JB		 2163 if (skb) {
2164 /* deliver to local stack */
2165 skb->protocol = eth_type_trans(skb, dev);
2166 memset(skb->cb, 0, sizeof(skb->cb));
af9f9b22
JB		 2167 if (rx->napi)
2168 napi_gro_receive(rx->napi, skb);
06d181a8
JB		 2169 else
2170 netif_receive_skb(skb);
571ecf67
JB		 2171 }
2172
76ee65bf 2173 if (xmit_skb) {
aef6c928
HS		 2174 /*
2175 * Send to wireless media and increase priority by 256 to
2176 * keep the received priority instead of reclassifying
2177 * the frame (see cfg80211_classify8021d).
2178 */
2179 xmit_skb->priority += 256;
f831e909 2180 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2181 skb_reset_network_header(xmit_skb);
2182 skb_reset_mac_header(xmit_skb);
76ee65bf 2183 dev_queue_xmit(xmit_skb);
571ecf67 2184 }
76ee65bf
RR		 2185}
2186
49461622 2187static ieee80211_rx_result debug_noinline
5cf121c3 2188ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2189{
eb9fb5b8 2190 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2191 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2192 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2193 __le16 fc = hdr->frame_control;
eaf85ca7 2194 struct sk_buff_head frame_list;
554891e6 2195 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2196
358c8d9d 2197 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2198 return RX_CONTINUE;
fd4c7f2f 2199
358c8d9d 2200 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2201 return RX_DROP_MONITOR;
fd4c7f2f 2202
554891e6 2203 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2204 return RX_CONTINUE;
fd4c7f2f 2205
eaf85ca7
ZY		 2206 if (ieee80211_has_a4(hdr->frame_control) &&
2207 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2208 !rx->sdata->u.vlan.sta)
e4c26add 2209 return RX_DROP_UNUSABLE;
fd4c7f2f 2210
eaf85ca7
ZY		 2211 if (is_multicast_ether_addr(hdr->addr1) &&
2212 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2213 rx->sdata->u.vlan.sta) ||
2214 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2215 rx->sdata->u.mgd.use_4addr)))
e4c26add 2216 return RX_DROP_UNUSABLE;
fd4c7f2f 2217
eaf85ca7
ZY		 2218 skb->dev = dev;
2219 __skb_queue_head_init(&frame_list);
fd4c7f2f 2220
e3cf8b3f
ZY		 2221 if (skb_linearize(skb))
2222 return RX_DROP_UNUSABLE;
2223
eaf85ca7
ZY		 2224 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2225 rx->sdata->vif.type,
8b3becad 2226 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2227
eaf85ca7
ZY		 2228 while (!skb_queue_empty(&frame_list)) {
2229 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2230
358c8d9d 2231 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2232 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2233 continue;
2234 }
fd4c7f2f
RR		 2235
2236 ieee80211_deliver_skb(rx);
2237 }
2238
9ae54c84 2239 return RX_QUEUED;
fd4c7f2f
RR		 2240}
2241
bf94e17b 2242#ifdef CONFIG_MAC80211_MESH
b0dee578 2243static ieee80211_rx_result
e32f85f7
LCC		 2244ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2245{
30789eb6
TP		 2246 struct ieee80211_hdr *fwd_hdr, *hdr;
2247 struct ieee80211_tx_info *info;
e32f85f7 2248 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2249 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2250 struct ieee80211_local *local = rx->local;
eb9fb5b8 2251 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2252 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
cf440128 2253 u16 ac, q, hdrlen;
e32f85f7
LCC		 2254
2255 hdr = (struct ieee80211_hdr *) skb->data;
2256 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2257
2258 /* make sure fixed part of mesh header is there, also checks skb len */
2259 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2260 return RX_DROP_MONITOR;
2261
2262 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2263
2264 /* make sure full mesh header is there, also checks skb len */
2265 if (!pskb_may_pull(rx->skb,
2266 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2267 return RX_DROP_MONITOR;
2268
2269 /* reload pointers */
2270 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2271 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2272
d0c22119
BC		 2273 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2274 return RX_DROP_MONITOR;
2275
2157fdd6
TP		 2276 /* frame is in RMC, don't forward */
2277 if (ieee80211_is_data(hdr->frame_control) &&
2278 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2279 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2280 return RX_DROP_MONITOR;
2281
5c90067c 2282 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2283 return RX_CONTINUE;
2284
2285 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2286 return RX_DROP_MONITOR;
2287
43b7b314 2288 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2289 struct mesh_path *mppath;
43b7b314
JC		 2290 char *proxied_addr;
2291 char *mpp_addr;
2292
2293 if (is_multicast_ether_addr(hdr->addr1)) {
2294 mpp_addr = hdr->addr3;
2295 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2296 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2297 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2298 mpp_addr = hdr->addr4;
2299 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2300 } else {
2301 return RX_DROP_MONITOR;
43b7b314 2302 }
79617dee 2303
79617dee 2304 rcu_read_lock();
bf7cd94d 2305 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2306 if (!mppath) {
bf7cd94d 2307 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2308 } else {
2309 spin_lock_bh(&mppath->state_lock);
b203ca39 2310 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2311 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2312 spin_unlock_bh(&mppath->state_lock);
2313 }
2314 rcu_read_unlock();
2315 }
2316
3c5772a5
JC		 2317 /* Frame has reached destination. Don't forward */
2318 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2319 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2320 return RX_CONTINUE;
2321
cf440128
MK		 2322 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2323 q = sdata->vif.hw_queue[ac];
d3c1597b 2324 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2325 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2326 return RX_DROP_MONITOR;
2327 }
2328 skb_set_queue_mapping(skb, q);
e32f85f7 2329
30789eb6
TP		 2330 if (!--mesh_hdr->ttl) {
2331 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2332 goto out;
30789eb6
TP		 2333 }
2334
d665508b
CYY		 2335 if (!ifmsh->mshcfg.dot11MeshForwarding)
2336 goto out;
2337
30789eb6
TP		 2338 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2339 if (!fwd_skb) {
bdcbd8e0 2340 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2341 sdata->name);
30789eb6
TP		 2342 goto out;
2343 }
2344
2345 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2346 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2347 info = IEEE80211_SKB_CB(fwd_skb);
2348 memset(info, 0, sizeof(*info));
2349 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2350 info->control.vif = &rx->sdata->vif;
2351 info->control.jiffies = jiffies;
2352 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2353 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2354 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2355 /* update power mode indication when forwarding */
2356 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2357 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2358 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2359 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2360 } else {
2361 /* unable to resolve next hop */
bf7cd94d 2362 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2363 fwd_hdr->addr3, 0,
2364 WLAN_REASON_MESH_PATH_NOFORWARD,
2365 fwd_hdr->addr2);
30789eb6 2366 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2367 kfree_skb(fwd_skb);
30789eb6 2368 return RX_DROP_MONITOR;
e32f85f7
LCC		 2369 }
2370
30789eb6
TP		 2371 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2372 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2373 out:
df140465 2374 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2375 return RX_CONTINUE;
df140465 2376 return RX_DROP_MONITOR;
e32f85f7 2377}
bf94e17b 2378#endif
e32f85f7 2379
49461622 2380static ieee80211_rx_result debug_noinline
5cf121c3 2381ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2382{
eb9fb5b8 2383 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2384 struct ieee80211_local *local = rx->local;
eb9fb5b8 2385 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2386 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2387 __le16 fc = hdr->frame_control;
4114fa21 2388 bool port_control;
ce3edf6d 2389 int err;
76ee65bf 2390
358c8d9d 2391 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2392 return RX_CONTINUE;
76ee65bf 2393
358c8d9d 2394 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2395 return RX_DROP_MONITOR;
76ee65bf 2396
79c892b8 2397 if (rx->sta) {
3d6dc343 2398 /* The seqno index has the same property as needed
79c892b8
JB		 2399 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2400 * for non-QoS-data frames. Here we know it's a data
2401 * frame, so count MSDUs.
2402 */
e5a9f8d0 2403 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
79c892b8
JB		 2404 }
2405
f14543ee 2406 /*
e7f4a940
JB		 2407 * Send unexpected-4addr-frame event to hostapd. For older versions,
2408 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2409 */
2410 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2411 sdata->vif.type == NL80211_IFTYPE_AP) {
2412 if (rx->sta &&
2413 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2414 cfg80211_rx_unexpected_4addr_frame(
2415 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2416 return RX_DROP_MONITOR;
e7f4a940 2417 }
f14543ee 2418
4114fa21 2419 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2420 if (unlikely(err))
e4c26add 2421 return RX_DROP_UNUSABLE;
76ee65bf 2422
358c8d9d 2423 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2424 return RX_DROP_MONITOR;
ce3edf6d 2425
8a4d32f3
AN		 2426 /* directly handle TDLS channel switch requests/responses */
2427 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2428 cpu_to_be16(ETH_P_TDLS))) {
2429 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2430
2431 if (pskb_may_pull(rx->skb,
2432 offsetof(struct ieee80211_tdls_data, u)) &&
2433 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2434 tf->category == WLAN_CATEGORY_TDLS &&
2435 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2436 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2437 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2438 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2439 if (rx->sta)
e5a9f8d0 2440 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2441
2442 return RX_QUEUED;
2443 }
2444 }
2445
4114fa21
FF		 2446 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2447 unlikely(port_control) && sdata->bss) {
2448 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2449 u.ap);
2450 dev = sdata->dev;
2451 rx->sdata = sdata;
2452 }
2453
76ee65bf
RR		 2454 rx->skb->dev = dev;
2455
08ca944e 2456 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2457 !is_multicast_ether_addr(
2458 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2459 (!local->scanning &&
2460 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2461 mod_timer(&local->dynamic_ps_timer, jiffies +
2462 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2463 }
2464
76ee65bf 2465 ieee80211_deliver_skb(rx);
571ecf67 2466
9ae54c84 2467 return RX_QUEUED;
571ecf67
JB		 2468}
2469
49461622 2470static ieee80211_rx_result debug_noinline
f9e124fb 2471ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2472{
71364716 2473 struct sk_buff *skb = rx->skb;
a7767f95 2474 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2475 struct tid_ampdu_rx *tid_agg_rx;
2476 u16 start_seq_num;
2477 u16 tid;
2478
a7767f95 2479 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2480 return RX_CONTINUE;
71364716 2481
a7767f95 2482 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2483 struct {
2484 __le16 control, start_seq_num;
2485 } __packed bar_data;
6382246e
EG		 2486 struct ieee80211_event event = {
2487 .type = BAR_RX_EVENT,
2488 };
8ae5977f 2489
71364716 2490 if (!rx->sta)
a02ae758 2491 return RX_DROP_MONITOR;
8ae5977f
JB		 2492
2493 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2494 &bar_data, sizeof(bar_data)))
2495 return RX_DROP_MONITOR;
2496
8ae5977f 2497 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2498
2499 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2500 if (!tid_agg_rx)
a02ae758 2501 return RX_DROP_MONITOR;
71364716 2502
8ae5977f 2503 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2504 event.u.ba.tid = tid;
2505 event.u.ba.ssn = start_seq_num;
2506 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2507
2508 /* reset session timer */
20ad19d0
JB		 2509 if (tid_agg_rx->timeout)
2510 mod_timer(&tid_agg_rx->session_timer,
2511 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2512
dd318575 2513 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2514 /* release stored frames up to start of BAR */
d3b2fb53 2515 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2516 start_seq_num, frames);
dd318575
JB		 2517 spin_unlock(&tid_agg_rx->reorder_lock);
2518
6382246e
EG		 2519 drv_event_callback(rx->local, rx->sdata, &event);
2520
a02ae758
JB		 2521 kfree_skb(skb);
2522 return RX_QUEUED;
71364716
RR		 2523 }
2524
08daecae
JB		 2525 /*
2526 * After this point, we only want management frames,
2527 * so we can drop all remaining control frames to
2528 * cooked monitor interfaces.
2529 */
2530 return RX_DROP_MONITOR;
71364716
RR		 2531}
2532
f4f727a6
JM		 2533static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2534 struct ieee80211_mgmt *mgmt,
2535 size_t len)
fea14732
JM		 2536{
2537 struct ieee80211_local *local = sdata->local;
2538 struct sk_buff *skb;
2539 struct ieee80211_mgmt *resp;
2540
b203ca39 2541 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2542 /* Not to own unicast address */
2543 return;
2544 }
2545
b203ca39
JP		 2546 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2547 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2548 /* Not from the current AP or not associated yet. */
fea14732
JM		 2549 return;
2550 }
2551
2552 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2553 /* Too short SA Query request frame */
2554 return;
2555 }
2556
2557 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2558 if (skb == NULL)
2559 return;
2560
2561 skb_reserve(skb, local->hw.extra_tx_headroom);
2562 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2563 memset(resp, 0, 24);
2564 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2565 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2566 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2567 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2568 IEEE80211_STYPE_ACTION);
2569 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2570 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2571 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2572 memcpy(resp->u.action.u.sa_query.trans_id,
2573 mgmt->u.action.u.sa_query.trans_id,
2574 WLAN_SA_QUERY_TR_ID_LEN);
2575
62ae67be 2576 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2577}
2578
2e161f78
JB		 2579static ieee80211_rx_result debug_noinline
2580ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2581{
2582 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2583 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2584
2585 /*
2586 * From here on, look only at management frames.
2587 * Data and control frames are already handled,
2588 * and unknown (reserved) frames are useless.
2589 */
2590 if (rx->skb->len < 24)
2591 return RX_DROP_MONITOR;
2592
2593 if (!ieee80211_is_mgmt(mgmt->frame_control))
2594 return RX_DROP_MONITOR;
2595
ee971924
JB		 2596 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2597 ieee80211_is_beacon(mgmt->frame_control) &&
2598 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2599 int sig = 0;
2600
30686bf7 2601 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2602 sig = status->signal;
2603
ee971924
JB		 2604 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2605 rx->skb->data, rx->skb->len,
37c73b5f 2606 status->freq, sig);
ee971924
JB		 2607 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2608 }
2609
2e161f78
JB		 2610 if (ieee80211_drop_unencrypted_mgmt(rx))
2611 return RX_DROP_UNUSABLE;
2612
2613 return RX_CONTINUE;
2614}
2615
de1ede7a
JB		 2616static ieee80211_rx_result debug_noinline
2617ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2618{
2619 struct ieee80211_local *local = rx->local;
eb9fb5b8 2620 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2621 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2622 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2623 int len = rx->skb->len;
2624
2625 if (!ieee80211_is_action(mgmt->frame_control))
2626 return RX_CONTINUE;
2627
026331c4
JM		 2628 /* drop too small frames */
2629 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2630 return RX_DROP_UNUSABLE;
de1ede7a 2631
815b8092 2632 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2633 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2634 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2635 return RX_DROP_UNUSABLE;
de1ede7a 2636
de1ede7a 2637 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2638 case WLAN_CATEGORY_HT:
2639 /* reject HT action frames from stations not supporting HT */
2640 if (!rx->sta->sta.ht_cap.ht_supported)
2641 goto invalid;
2642
2643 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2644 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2645 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2646 sdata->vif.type != NL80211_IFTYPE_AP &&
2647 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2648 break;
2649
ec61cd63 2650 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2651 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2652 goto invalid;
2653
2654 switch (mgmt->u.action.u.ht_smps.action) {
2655 case WLAN_HT_ACTION_SMPS: {
2656 struct ieee80211_supported_band *sband;
af0ed69b 2657 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2658
2659 /* convert to HT capability */
2660 switch (mgmt->u.action.u.ht_smps.smps_control) {
2661 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2662 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2663 break;
2664 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2665 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2666 break;
2667 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2668 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2669 break;
2670 default:
2671 goto invalid;
2672 }
1d8d3dec
JB		 2673
2674 /* if no change do nothing */
af0ed69b 2675 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2676 goto handled;
af0ed69b 2677 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2678
2679 sband = rx->local->hw.wiphy->bands[status->band];
2680
64f68e5d
JB		 2681 rate_control_rate_update(local, sband, rx->sta,
2682 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2683 goto handled;
2684 }
ec61cd63
JB		 2685 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2686 struct ieee80211_supported_band *sband;
2687 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2688 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2689
2690 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2691 if (!(rx->sta->sta.ht_cap.cap &
2692 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2693 goto handled;
2694
e1a0c6b3 2695 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2696 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2697 else
1c45c5ce
EP		 2698 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2699
2700 /* set cur_max_bandwidth and recalc sta bw */
2701 rx->sta->cur_max_bandwidth = max_bw;
2702 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2703
e1a0c6b3 2704 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2705 goto handled;
2706
1c45c5ce 2707 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2708 sband = rx->local->hw.wiphy->bands[status->band];
2709
2710 rate_control_rate_update(local, sband, rx->sta,
2711 IEEE80211_RC_BW_CHANGED);
2712 goto handled;
2713 }
1d8d3dec
JB		 2714 default:
2715 goto invalid;
2716 }
2717
0af83d3d 2718 break;
1b3a2e49
JB		 2719 case WLAN_CATEGORY_PUBLIC:
2720 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2721 goto invalid;
2722 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2723 break;
2724 if (!rx->sta)
2725 break;
2726 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2727 break;
2728 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2729 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2730 break;
2731 if (len < offsetof(struct ieee80211_mgmt,
2732 u.action.u.ext_chan_switch.variable))
2733 goto invalid;
2734 goto queue;
0af83d3d
JB		 2735 case WLAN_CATEGORY_VHT:
2736 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2737 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2738 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2739 sdata->vif.type != NL80211_IFTYPE_AP &&
2740 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2741 break;
2742
2743 /* verify action code is present */
2744 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2745 goto invalid;
2746
2747 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2748 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2749 u8 opmode;
2750
2751 /* verify opmode is present */
2752 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2753 goto invalid;
2754
2755 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2756
2757 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
cf1e05c6 2758 opmode, status->band);
0af83d3d
JB		 2759 goto handled;
2760 }
23a1f8d4
SS		 2761 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2762 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2763 goto invalid;
2764 goto queue;
2765 }
0af83d3d
JB		 2766 default:
2767 break;
2768 }
1d8d3dec 2769 break;
de1ede7a 2770 case WLAN_CATEGORY_BACK:
8abd3f9b 2771 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2772 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2773 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2774 sdata->vif.type != NL80211_IFTYPE_AP &&
2775 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2776 break;
8abd3f9b 2777
026331c4
JM		 2778 /* verify action_code is present */
2779 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2780 break;
2781
de1ede7a
JB		 2782 switch (mgmt->u.action.u.addba_req.action_code) {
2783 case WLAN_ACTION_ADDBA_REQ:
2784 if (len < (IEEE80211_MIN_ACTION_SIZE +
2785 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2786 goto invalid;
2787 break;
de1ede7a
JB		 2788 case WLAN_ACTION_ADDBA_RESP:
2789 if (len < (IEEE80211_MIN_ACTION_SIZE +
2790 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2791 goto invalid;
2792 break;
de1ede7a
JB		 2793 case WLAN_ACTION_DELBA:
2794 if (len < (IEEE80211_MIN_ACTION_SIZE +
2795 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2796 goto invalid;
2797 break;
2798 default:
2799 goto invalid;
de1ede7a 2800 }
bed7ee6e 2801
8b58ff83 2802 goto queue;
39192c0b 2803 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2804 /* verify action_code is present */
2805 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2806 break;
2807
39192c0b
JB		 2808 switch (mgmt->u.action.u.measurement.action_code) {
2809 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2810 if (status->band != IEEE80211_BAND_5GHZ)
2811 break;
2812
39192c0b
JB		 2813 if (len < (IEEE80211_MIN_ACTION_SIZE +
2814 sizeof(mgmt->u.action.u.measurement)))
84040805 2815 break;
cd7760e6
SW		 2816
2817 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2818 break;
2819
39192c0b 2820 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2821 goto handled;
cd7760e6
SW		 2822 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2823 u8 *bssid;
2824 if (len < (IEEE80211_MIN_ACTION_SIZE +
2825 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2826 break;
cc32abd4 2827
cd7760e6 2828 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2829 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2830 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2831 break;
2832
2833 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2834 bssid = sdata->u.mgd.bssid;
2835 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2836 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2837 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2838 bssid = mgmt->sa;
cd7760e6
SW		 2839 else
2840 break;
2841
2842 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2843 break;
c481ec97 2844
8b58ff83 2845 goto queue;
cd7760e6 2846 }
39192c0b
JB		 2847 }
2848 break;
fea14732
JM		 2849 case WLAN_CATEGORY_SA_QUERY:
2850 if (len < (IEEE80211_MIN_ACTION_SIZE +
2851 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2852 break;
2853
fea14732
JM		 2854 switch (mgmt->u.action.u.sa_query.action) {
2855 case WLAN_ACTION_SA_QUERY_REQUEST:
2856 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2857 break;
fea14732 2858 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2859 goto handled;
fea14732
JM		 2860 }
2861 break;
8db09850 2862 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2863 if (len < (IEEE80211_MIN_ACTION_SIZE +
2864 sizeof(mgmt->u.action.u.self_prot.action_code)))
2865 break;
2866
8db09850
TP		 2867 switch (mgmt->u.action.u.self_prot.action_code) {
2868 case WLAN_SP_MESH_PEERING_OPEN:
2869 case WLAN_SP_MESH_PEERING_CLOSE:
2870 case WLAN_SP_MESH_PEERING_CONFIRM:
2871 if (!ieee80211_vif_is_mesh(&sdata->vif))
2872 goto invalid;
a6dad6a2 2873 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2874 /* userspace handles this frame */
2875 break;
2876 goto queue;
2877 case WLAN_SP_MGK_INFORM:
2878 case WLAN_SP_MGK_ACK:
2879 if (!ieee80211_vif_is_mesh(&sdata->vif))
2880 goto invalid;
2881 break;
2882 }
2883 break;
d3aaec8a 2884 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2885 if (len < (IEEE80211_MIN_ACTION_SIZE +
2886 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2887 break;
2888
77a121c3
JB		 2889 if (!ieee80211_vif_is_mesh(&sdata->vif))
2890 break;
25d49e4d 2891 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2892 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2893 break;
2894 goto queue;
84040805 2895 }
026331c4 2896
2e161f78
JB		 2897 return RX_CONTINUE;
2898
bed7ee6e 2899 invalid:
554891e6 2900 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2901 /* will return in the next handlers */
2902 return RX_CONTINUE;
2903
2904 handled:
2905 if (rx->sta)
e5a9f8d0 2906 rx->sta->rx_stats.packets++;
2e161f78
JB		 2907 dev_kfree_skb(rx->skb);
2908 return RX_QUEUED;
2909
2910 queue:
2911 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2912 skb_queue_tail(&sdata->skb_queue, rx->skb);
2913 ieee80211_queue_work(&local->hw, &sdata->work);
2914 if (rx->sta)
e5a9f8d0 2915 rx->sta->rx_stats.packets++;
2e161f78
JB		 2916 return RX_QUEUED;
2917}
2918
2919static ieee80211_rx_result debug_noinline
2920ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2921{
554891e6 2922 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2923 int sig = 0;
2e161f78
JB		 2924
2925 /* skip known-bad action frames and return them in the next handler */
554891e6 2926 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2927 return RX_CONTINUE;
d7907448 2928
026331c4
JM		 2929 /*
2930 * Getting here means the kernel doesn't know how to handle
2931 * it, but maybe userspace does ... include returned frames
2932 * so userspace can register for those to know whether ones
2933 * it transmitted were processed or returned.
2934 */
026331c4 2935
30686bf7 2936 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2937 sig = status->signal;
2938
71bbc994 2939 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2940 rx->skb->data, rx->skb->len, 0)) {
2e161f78 2941 if (rx->sta)
e5a9f8d0 2942 rx->sta->rx_stats.packets++;
2e161f78
JB		 2943 dev_kfree_skb(rx->skb);
2944 return RX_QUEUED;
2945 }
2946
2e161f78
JB		 2947 return RX_CONTINUE;
2948}
2949
2950static ieee80211_rx_result debug_noinline
2951ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2952{
2953 struct ieee80211_local *local = rx->local;
2954 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2955 struct sk_buff *nskb;
2956 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2957 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2958
2959 if (!ieee80211_is_action(mgmt->frame_control))
2960 return RX_CONTINUE;
2961
2962 /*
2963 * For AP mode, hostapd is responsible for handling any action
2964 * frames that we didn't handle, including returning unknown
2965 * ones. For all other modes we will return them to the sender,
2966 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2967 * 802.11-2012 9.24.4.
2e161f78
JB		 2968 * Newer versions of hostapd shall also use the management frame
2969 * registration mechanisms, but older ones still use cooked
2970 * monitor interfaces so push all frames there.
2971 */
554891e6 2972 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2973 (sdata->vif.type == NL80211_IFTYPE_AP ||
2974 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2975 return RX_DROP_MONITOR;
026331c4 2976
4b5ebccc
JB		 2977 if (is_multicast_ether_addr(mgmt->da))
2978 return RX_DROP_MONITOR;
2979
84040805
JB		 2980 /* do not return rejected action frames */
2981 if (mgmt->u.action.category & 0x80)
2982 return RX_DROP_UNUSABLE;
2983
2984 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2985 GFP_ATOMIC);
2986 if (nskb) {
292b4df6 2987 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2988
292b4df6
JL		 2989 nmgmt->u.action.category |= 0x80;
2990 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2991 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2992
2993 memset(nskb->cb, 0, sizeof(nskb->cb));
2994
07e5a5f5
JB		 2995 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2996 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2997
2998 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2999 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3000 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 3001 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 3002 info->hw_queue =
3003 local->hw.offchannel_tx_hw_queue;
3004 }
3005
3006 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3007 status->band);
de1ede7a 3008 }
39192c0b
JB		 3009 dev_kfree_skb(rx->skb);
3010 return RX_QUEUED;
de1ede7a
JB		 3011}
3012
49461622 3013static ieee80211_rx_result debug_noinline
5cf121c3 3014ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3015{
eb9fb5b8 3016 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3017 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3018 __le16 stype;
571ecf67 3019
77a121c3 3020 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3021
77a121c3
JB		 3022 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3023 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3024 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3025 sdata->vif.type != NL80211_IFTYPE_STATION)
3026 return RX_DROP_MONITOR;
472dbc45 3027
77a121c3 3028 switch (stype) {
66e67e41 3029 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3030 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3031 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3032 /* process for all: mesh, mlme, ibss */
3033 break;
66e67e41
JB		 3034 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3035 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3036 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3037 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3038 if (is_multicast_ether_addr(mgmt->da) &&
3039 !is_broadcast_ether_addr(mgmt->da))
3040 return RX_DROP_MONITOR;
3041
77a121c3
JB		 3042 /* process only for station */
3043 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3044 return RX_DROP_MONITOR;
3045 break;
3046 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3047 /* process only for ibss and mesh */
3048 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3049 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3050 return RX_DROP_MONITOR;
3051 break;
3052 default:
3053 return RX_DROP_MONITOR;
3054 }
f9d540ee 3055
77a121c3 3056 /* queue up frame and kick off work to process it */
c1475ca9 3057 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3058 skb_queue_tail(&sdata->skb_queue, rx->skb);
3059 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3060 if (rx->sta)
e5a9f8d0 3061 rx->sta->rx_stats.packets++;
46900298 3062
77a121c3 3063 return RX_QUEUED;
571ecf67
JB		 3064}
3065
5f0b7de5
JB		 3066static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3067 struct ieee80211_rate *rate)
3d30d949
MW		 3068{
3069 struct ieee80211_sub_if_data *sdata;
3070 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3071 struct sk_buff *skb = rx->skb, *skb2;
3072 struct net_device *prev_dev = NULL;
eb9fb5b8 3073 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3074 int needed_headroom;
3d30d949 3075
554891e6
JB		 3076 /*
3077 * If cooked monitor has been processed already, then
3078 * don't do it again. If not, set the flag.
3079 */
3080 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3081 goto out_free_skb;
554891e6 3082 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3083
152c477a
JB		 3084 /* If there are no cooked monitor interfaces, just free the SKB */
3085 if (!local->cooked_mntrs)
3086 goto out_free_skb;
3087
1f7bba79
JB		 3088 /* vendor data is long removed here */
3089 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3090 /* room for the radiotap header based on driver features */
1f7bba79 3091 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3092
293702a3
JB		 3093 if (skb_headroom(skb) < needed_headroom &&
3094 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3095 goto out_free_skb;
3d30d949 3096
293702a3 3097 /* prepend radiotap information */
973ef21a
FF		 3098 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3099 false);
3d30d949
MW		 3100
3101 skb_set_mac_header(skb, 0);
3102 skb->ip_summed = CHECKSUM_UNNECESSARY;
3103 skb->pkt_type = PACKET_OTHERHOST;
3104 skb->protocol = htons(ETH_P_802_2);
3105
3106 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3107 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3108 continue;
3109
05c914fe 3110 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 3111 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3112 continue;
3113
3114 if (prev_dev) {
3115 skb2 = skb_clone(skb, GFP_ATOMIC);
3116 if (skb2) {
3117 skb2->dev = prev_dev;
5548a8a1 3118 netif_receive_skb(skb2);
3d30d949
MW		 3119 }
3120 }
3121
3122 prev_dev = sdata->dev;
5a490510 3123 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3124 }
3125
3126 if (prev_dev) {
3127 skb->dev = prev_dev;
5548a8a1 3128 netif_receive_skb(skb);
554891e6
JB		 3129 return;
3130 }
3d30d949
MW		 3131
3132 out_free_skb:
3133 dev_kfree_skb(skb);
3134}
3135
aa0c8636
CL		 3136static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3137 ieee80211_rx_result res)
3138{
3139 switch (res) {
3140 case RX_DROP_MONITOR:
3141 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3142 if (rx->sta)
e5a9f8d0 3143 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3144 /* fall through */
3145 case RX_CONTINUE: {
3146 struct ieee80211_rate *rate = NULL;
3147 struct ieee80211_supported_band *sband;
3148 struct ieee80211_rx_status *status;
3149
3150 status = IEEE80211_SKB_RXCB((rx->skb));
3151
3152 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3153 if (!(status->flag & RX_FLAG_HT) &&
3154 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3155 rate = &sband->bitrates[status->rate_idx];
3156
3157 ieee80211_rx_cooked_monitor(rx, rate);
3158 break;
3159 }
3160 case RX_DROP_UNUSABLE:
3161 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3162 if (rx->sta)
e5a9f8d0 3163 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3164 dev_kfree_skb(rx->skb);
3165 break;
3166 case RX_QUEUED:
3167 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3168 break;
3169 }
3170}
571ecf67 3171
f9e124fb
CL		 3172static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3173 struct sk_buff_head *frames)
58905290 3174{
58905290 3175 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3176 struct sk_buff *skb;
8944b79f 3177
e32f85f7
LCC		 3178#define CALL_RXH(rxh) \
3179 do { \
3180 res = rxh(rx); \
3181 if (res != RX_CONTINUE) \
2569a826 3182 goto rxh_next; \
e32f85f7 3183 } while (0);
49461622 3184
45ceeee8
JB		 3185 /* Lock here to avoid hitting all of the data used in the RX
3186 * path (e.g. key data, station data, ...) concurrently when
3187 * a frame is released from the reorder buffer due to timeout
3188 * from the timer, potentially concurrently with RX from the
3189 * driver.
3190 */
f9e124fb 3191 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3192
f9e124fb 3193 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3194 /*
3195 * all the other fields are valid across frames
3196 * that belong to an aMPDU since they are on the
3197 * same TID from the same station
3198 */
3199 rx->skb = skb;
3200
2569a826 3201 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 3202 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 3203 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 3204 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 3205 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 3206 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3207 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3208#ifdef CONFIG_MAC80211_MESH
aa0c8636 3209 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3210 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3211#endif
2154c81c 3212 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 3213 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 3214
3215 /* special treatment -- needs the queue */
3216 res = ieee80211_rx_h_ctrl(rx, frames);
3217 if (res != RX_CONTINUE)
3218 goto rxh_next;
3219
2e161f78 3220 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3221 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3222 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3223 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3224 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3225
aa0c8636
CL		 3226 rxh_next:
3227 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3228
49461622 3229#undef CALL_RXH
aa0c8636 3230 }
24a8fdad 3231
f9e124fb 3232 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3233}
3234
4406c376 3235static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3236{
f9e124fb 3237 struct sk_buff_head reorder_release;
aa0c8636
CL		 3238 ieee80211_rx_result res = RX_DROP_MONITOR;
3239
f9e124fb
CL		 3240 __skb_queue_head_init(&reorder_release);
3241
aa0c8636
CL		 3242#define CALL_RXH(rxh) \
3243 do { \
3244 res = rxh(rx); \
3245 if (res != RX_CONTINUE) \
3246 goto rxh_next; \
3247 } while (0);
3248
0395442a 3249 CALL_RXH(ieee80211_rx_h_check_dup)
aa0c8636
CL		 3250 CALL_RXH(ieee80211_rx_h_check)
3251
f9e124fb 3252 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3253
f9e124fb 3254 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3255 return;
49461622 3256
2569a826 3257 rxh_next:
aa0c8636
CL		 3258 ieee80211_rx_handlers_result(rx, res);
3259
3260#undef CALL_RXH
58905290
JB		 3261}
3262
2bff8ebf 3263/*
dd318575
JB		 3264 * This function makes calls into the RX path, therefore
3265 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3266 */
3267void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3268{
f9e124fb 3269 struct sk_buff_head frames;
554891e6
JB		 3270 struct ieee80211_rx_data rx = {
3271 .sta = sta,
3272 .sdata = sta->sdata,
3273 .local = sta->local,
9e26297a
JB		 3274 /* This is OK -- must be QoS data frame */
3275 .security_idx = tid,
3276 .seqno_idx = tid,
af9f9b22 3277 .napi = NULL, /* must be NULL to not have races */
554891e6 3278 };
2c15a0cf
CL		 3279 struct tid_ampdu_rx *tid_agg_rx;
3280
3281 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3282 if (!tid_agg_rx)
3283 return;
2bff8ebf 3284
f9e124fb
CL		 3285 __skb_queue_head_init(&frames);
3286
2c15a0cf 3287 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3288 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3289 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3290
b497de63
EG		 3291 if (!skb_queue_empty(&frames)) {
3292 struct ieee80211_event event = {
3293 .type = BA_FRAME_TIMEOUT,
3294 .u.ba.tid = tid,
3295 .u.ba.sta = &sta->sta,
3296 };
3297 drv_event_callback(rx.local, rx.sdata, &event);
3298 }
3299
f9e124fb 3300 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3301}
3302
571ecf67
JB		 3303/* main receive path */
3304
a58fbe1a 3305static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3306{
20b01f80 3307 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3308 struct sk_buff *skb = rx->skb;
a58fbe1a 3309 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3310 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3311 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3312 int multicast = is_multicast_ether_addr(hdr->addr1);
3313
51fb61e7 3314 switch (sdata->vif.type) {
05c914fe 3315 case NL80211_IFTYPE_STATION:
9bc383de 3316 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3317 return false;
a58fbe1a
JB		 3318 if (multicast)
3319 return true;
3320 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3321 case NL80211_IFTYPE_ADHOC:
23a24def 3322 if (!bssid)
3c2723f5 3323 return false;
6329b8d9
FF		 3324 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3325 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3326 return false;
a58fbe1a 3327 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3328 return true;
a58fbe1a 3329 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3330 return false;
a58fbe1a
JB		 3331 if (!multicast &&
3332 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3333 return false;
a58fbe1a 3334 if (!rx->sta) {
0fb8ca45 3335 int rate_idx;
5614618e
JB		 3336 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3337 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3338 else
eb9fb5b8 3339 rate_idx = status->rate_idx;
8bf11d8d
JB		 3340 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3341 BIT(rate_idx));
0fb8ca45 3342 }
a58fbe1a 3343 return true;
239281f8
RL		 3344 case NL80211_IFTYPE_OCB:
3345 if (!bssid)
3346 return false;
cc117298 3347 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3348 return false;
a58fbe1a 3349 if (!is_broadcast_ether_addr(bssid))
239281f8 3350 return false;
a58fbe1a
JB		 3351 if (!multicast &&
3352 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3353 return false;
a58fbe1a 3354 if (!rx->sta) {
239281f8
RL		 3355 int rate_idx;
3356 if (status->flag & RX_FLAG_HT)
3357 rate_idx = 0; /* TODO: HT rates */
3358 else
3359 rate_idx = status->rate_idx;
3360 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3361 BIT(rate_idx));
3362 }
a58fbe1a 3363 return true;
05c914fe 3364 case NL80211_IFTYPE_MESH_POINT:
a58fbe1a
JB		 3365 if (multicast)
3366 return true;
3367 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3368 case NL80211_IFTYPE_AP_VLAN:
3369 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3370 if (!bssid)
3371 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3372
3373 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3374 /*
3375 * Accept public action frames even when the
3376 * BSSID doesn't match, this is used for P2P
3377 * and location updates. Note that mac80211
3378 * itself never looks at these frames.
3379 */
2b9ccd4e
JB		 3380 if (!multicast &&
3381 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3382 return false;
d48b2968 3383 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3384 return true;
5c90067c 3385 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3386 }
3387
3388 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3389 /* ignore data frames to TDLS-peers */
3390 if (ieee80211_is_data(hdr->frame_control))
3391 return false;
3392 /* ignore action frames to TDLS-peers */
3393 if (ieee80211_is_action(hdr->frame_control) &&
3394 !ether_addr_equal(bssid, hdr->addr1))
3395 return false;
23a24def 3396 }
a58fbe1a 3397 return true;
05c914fe 3398 case NL80211_IFTYPE_WDS:
a7767f95 3399 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3400 return false;
a58fbe1a 3401 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3402 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3403 return ieee80211_is_public_action(hdr, skb->len) ||
3404 ieee80211_is_probe_req(hdr->frame_control) ||
3405 ieee80211_is_probe_resp(hdr->frame_control) ||
3406 ieee80211_is_beacon(hdr->frame_control);
2ca27bcf 3407 default:
fb1c1cd6 3408 break;
23a24def
JB		 3409 }
3410
a58fbe1a
JB		 3411 WARN_ON_ONCE(1);
3412 return false;
23a24def
JB		 3413}
3414
4406c376
JB		 3415/*
3416 * This function returns whether or not the SKB
3417 * was destined for RX processing or not, which,
3418 * if consume is true, is equivalent to whether
3419 * or not the skb was consumed.
3420 */
3421static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3422 struct sk_buff *skb, bool consume)
3423{
3424 struct ieee80211_local *local = rx->local;
3425 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 3426
3427 rx->skb = skb;
4406c376 3428
a58fbe1a 3429 if (!ieee80211_accept_frame(rx))
4406c376
JB		 3430 return false;
3431
4406c376
JB		 3432 if (!consume) {
3433 skb = skb_copy(skb, GFP_ATOMIC);
3434 if (!skb) {
3435 if (net_ratelimit())
3436 wiphy_debug(local->hw.wiphy,
b305dae4 3437 "failed to copy skb for %s\n",
4406c376
JB		 3438 sdata->name);
3439 return true;
3440 }
3441
3442 rx->skb = skb;
3443 }
3444
3445 ieee80211_invoke_rx_handlers(rx);
3446 return true;
3447}
3448
571ecf67 3449/*
6b59db7d 3450 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3451 * be called with rcu_read_lock protection.
571ecf67 3452 */
71ebb4aa 3453static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
af9f9b22
JB		 3454 struct sk_buff *skb,
3455 struct napi_struct *napi)
571ecf67
JB		 3456{
3457 struct ieee80211_local *local = hw_to_local(hw);
3458 struct ieee80211_sub_if_data *sdata;
571ecf67 3459 struct ieee80211_hdr *hdr;
e3cf8b3f 3460 __le16 fc;
5cf121c3 3461 struct ieee80211_rx_data rx;
4406c376 3462 struct ieee80211_sub_if_data *prev;
7bedd0cf
JB		 3463 struct sta_info *sta, *prev_sta;
3464 struct rhash_head *tmp;
e3cf8b3f 3465 int err = 0;
571ecf67 3466
e3cf8b3f 3467 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3468 memset(&rx, 0, sizeof(rx));
3469 rx.skb = skb;
3470 rx.local = local;
af9f9b22 3471 rx.napi = napi;
72abd81b 3472
e3cf8b3f 3473 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 3474 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 3475
4a4f1a58
JB		 3476 if (ieee80211_is_mgmt(fc)) {
3477 /* drop frame if too short for header */
3478 if (skb->len < ieee80211_hdrlen(fc))
3479 err = -ENOBUFS;
3480 else
3481 err = skb_linearize(skb);
3482 } else {
e3cf8b3f 3483 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3484 }
e3cf8b3f
ZY		 3485
3486 if (err) {
3487 dev_kfree_skb(skb);
3488 return;
3489 }
3490
3491 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3492 ieee80211_parse_qos(&rx);
d1c3a37c 3493 ieee80211_verify_alignment(&rx);
38f3714d 3494
d48b2968
JB		 3495 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3496 ieee80211_is_beacon(hdr->frame_control)))
3497 ieee80211_scan_rx(local, skb);
3498
e3cf8b3f 3499 if (ieee80211_is_data(fc)) {
7bedd0cf
JB		 3500 const struct bucket_table *tbl;
3501
56af3268 3502 prev_sta = NULL;
4406c376 3503
7bedd0cf
JB		 3504 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3505
3506 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
56af3268
BG		 3507 if (!prev_sta) {
3508 prev_sta = sta;
3509 continue;
3510 }
3511
3512 rx.sta = prev_sta;
3513 rx.sdata = prev_sta->sdata;
4406c376 3514 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3515
56af3268 3516 prev_sta = sta;
4406c376 3517 }
56af3268
BG		 3518
3519 if (prev_sta) {
3520 rx.sta = prev_sta;
3521 rx.sdata = prev_sta->sdata;
3522
4406c376 3523 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3524 return;
8e26d5ad 3525 goto out;
56af3268 3526 }
4406c376
JB		 3527 }
3528
4b0dd98e 3529 prev = NULL;
b2e7771e 3530
4b0dd98e
JB		 3531 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3532 if (!ieee80211_sdata_running(sdata))
3533 continue;
340e11f3 3534
4b0dd98e
JB		 3535 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3536 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3537 continue;
340e11f3 3538
4b0dd98e
JB		 3539 /*
3540 * frame is destined for this interface, but if it's
3541 * not also for the previous one we handle that after
3542 * the loop to avoid copying the SKB once too much
3543 */
4bb29f8c 3544
4b0dd98e 3545 if (!prev) {
abe60632 3546 prev = sdata;
4b0dd98e 3547 continue;
340e11f3 3548 }
4bb29f8c 3549
7852e361 3550 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3551 rx.sdata = prev;
3552 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3553
4b0dd98e
JB		 3554 prev = sdata;
3555 }
3556
3557 if (prev) {
7852e361 3558 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3559 rx.sdata = prev;
4406c376 3560
4b0dd98e
JB		 3561 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3562 return;
571ecf67 3563 }
4406c376 3564
8e26d5ad 3565 out:
4406c376 3566 dev_kfree_skb(skb);
571ecf67 3567}
6368e4b1
RR		 3568
3569/*
3570 * This is the receive path handler. It is called by a low level driver when an
3571 * 802.11 MPDU is received from the hardware.
3572 */
af9f9b22
JB		 3573void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3574 struct napi_struct *napi)
6368e4b1
RR		 3575{
3576 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3577 struct ieee80211_rate *rate = NULL;
3578 struct ieee80211_supported_band *sband;
f1d58c25 3579 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3580
d20ef63d
JB		 3581 WARN_ON_ONCE(softirq_count() == 0);
3582
444e3803 3583 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3584 goto drop;
8318d78a
JB		 3585
3586 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3587 if (WARN_ON(!sband))
3588 goto drop;
8318d78a 3589
89c3a8ac
JB		 3590 /*
3591 * If we're suspending, it is possible although not too likely
3592 * that we'd be receiving frames after having already partially
3593 * quiesced the stack. We can't process such frames then since
3594 * that might, for example, cause stations to be added or other
3595 * driver callbacks be invoked.
3596 */
77a980dc
JB		 3597 if (unlikely(local->quiescing || local->suspended))
3598 goto drop;
89c3a8ac 3599
04800ada
AN		 3600 /* We might be during a HW reconfig, prevent Rx for the same reason */
3601 if (unlikely(local->in_reconfig))
3602 goto drop;
3603
ea77f12f
JB		 3604 /*
3605 * The same happens when we're not even started,
3606 * but that's worth a warning.
3607 */
77a980dc
JB		 3608 if (WARN_ON(!local->started))
3609 goto drop;
ea77f12f 3610
fc885189 3611 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3612 /*
fc885189
JB		 3613 * Validate the rate, unless a PLCP error means that
3614 * we probably can't have a valid rate here anyway.
e5d6eb83 3615 */
fc885189
JB		 3616
3617 if (status->flag & RX_FLAG_HT) {
3618 /*
3619 * rate_idx is MCS index, which can be [0-76]
3620 * as documented on:
3621 *
3622 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3623 *
3624 * Anything else would be some sort of driver or
3625 * hardware error. The driver should catch hardware
3626 * errors.
3627 */
444e3803 3628 if (WARN(status->rate_idx > 76,
fc885189
JB		 3629 "Rate marked as an HT rate but passed "
3630 "status->rate_idx is not "
3631 "an MCS index [0-76]: %d (0x%02x)\n",
3632 status->rate_idx,
3633 status->rate_idx))
3634 goto drop;
5614618e
JB		 3635 } else if (status->flag & RX_FLAG_VHT) {
3636 if (WARN_ONCE(status->rate_idx > 9 ||
3637 !status->vht_nss ||
3638 status->vht_nss > 8,
3639 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3640 status->rate_idx, status->vht_nss))
3641 goto drop;
fc885189 3642 } else {
444e3803 3643 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3644 goto drop;
3645 rate = &sband->bitrates[status->rate_idx];
3646 }
0fb8ca45 3647 }
6368e4b1 3648
554891e6
JB		 3649 status->rx_flags = 0;
3650
6368e4b1
RR		 3651 /*
3652 * key references and virtual interfaces are protected using RCU
3653 * and this requires that we are in a read-side RCU section during
3654 * receive processing
3655 */
3656 rcu_read_lock();
3657
3658 /*
3659 * Frames with failed FCS/PLCP checksum are not returned,
3660 * all other frames are returned without radiotap header
3661 * if it was previously present.
3662 * Also, frames with less than 16 bytes are dropped.
3663 */
f1d58c25 3664 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3665 if (!skb) {
3666 rcu_read_unlock();
3667 return;
3668 }
3669
e1e54068
JB		 3670 ieee80211_tpt_led_trig_rx(local,
3671 ((struct ieee80211_hdr *)skb->data)->frame_control,
3672 skb->len);
af9f9b22 3673 __ieee80211_rx_handle_packet(hw, skb, napi);
6368e4b1
RR		 3674
3675 rcu_read_unlock();
77a980dc
JB		 3676
3677 return;
3678 drop:
3679 kfree_skb(skb);
6368e4b1 3680}
af9f9b22 3681EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 3682
3683/* This is a version of the rx handler that can be called from hard irq
3684 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3685void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3686{
3687 struct ieee80211_local *local = hw_to_local(hw);
3688
3689 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3690
571ecf67
JB		 3691 skb->pkt_type = IEEE80211_RX_MSG;
3692 skb_queue_tail(&local->skb_queue, skb);
3693 tasklet_schedule(&local->tasklet);
3694}
3695EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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