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cfg80211: add ability to check DA/SA in A-MSDU decapsulation
[linux-2.6-block.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>
06470f74 22#include <linux/bitops.h>
571ecf67
JB		 23#include <net/mac80211.h>
24#include <net/ieee80211_radiotap.h>
d26ad377 25#include <asm/unaligned.h>
571ecf67
JB		 26
27#include "ieee80211_i.h"
24487981 28#include "driver-ops.h"
2c8dccc7 29#include "led.h"
33b64eb2 30#include "mesh.h"
571ecf67
JB		 31#include "wep.h"
32#include "wpa.h"
33#include "tkip.h"
34#include "wme.h"
1d8d3dec 35#include "rate.h"
571ecf67 36
5a490510
JB		 37static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
38{
39 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
40
41 u64_stats_update_begin(&tstats->syncp);
42 tstats->rx_packets++;
43 tstats->rx_bytes += len;
44 u64_stats_update_end(&tstats->syncp);
45}
46
a6828493
JB		 47static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
49{
50 __le16 fc = hdr->frame_control;
51
52 if (ieee80211_is_data(fc)) {
53 if (len < 24) /* drop incorrect hdr len (data) */
54 return NULL;
55
56 if (ieee80211_has_a4(fc))
57 return NULL;
58 if (ieee80211_has_tods(fc))
59 return hdr->addr1;
60 if (ieee80211_has_fromds(fc))
61 return hdr->addr2;
62
63 return hdr->addr3;
64 }
65
66 if (ieee80211_is_mgmt(fc)) {
67 if (len < 24) /* drop incorrect hdr len (mgmt) */
68 return NULL;
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_ctl(fc)) {
73 if (ieee80211_is_pspoll(fc))
74 return hdr->addr1;
75
76 if (ieee80211_is_back_req(fc)) {
77 switch (type) {
78 case NL80211_IFTYPE_STATION:
79 return hdr->addr2;
80 case NL80211_IFTYPE_AP:
81 case NL80211_IFTYPE_AP_VLAN:
82 return hdr->addr1;
83 default:
84 break; /* fall through to the return */
85 }
86 }
87 }
88
89 return NULL;
90}
91
b2e7771e
JB		 92/*
93 * monitor mode reception
94 *
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
97 */
98static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
1f7bba79
JB		 99 struct sk_buff *skb,
100 unsigned int rtap_vendor_space)
b2e7771e 101{
30686bf7 102 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
b2e7771e 103 if (likely(skb->len > FCS_LEN))
e3cf8b3f 104 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 105 else {
106 /* driver bug */
107 WARN_ON(1);
108 dev_kfree_skb(skb);
0624760c 109 return NULL;
b2e7771e
JB		 110 }
111 }
112
1f7bba79
JB		 113 __pskb_pull(skb, rtap_vendor_space);
114
b2e7771e
JB		 115 return skb;
116}
117
1f7bba79
JB		 118static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
119 unsigned int rtap_vendor_space)
b2e7771e 120{
f1d58c25 121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 122 struct ieee80211_hdr *hdr;
123
124 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 125
4c298677 126 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
17883048
GB		 127 RX_FLAG_FAILED_PLCP_CRC |
128 RX_FLAG_ONLY_MONITOR))
6b59db7d
ZG		 129 return true;
130
1f7bba79 131 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 132 return true;
133
87228f57
HH		 134 if (ieee80211_is_ctl(hdr->frame_control) &&
135 !ieee80211_is_pspoll(hdr->frame_control) &&
136 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 137 return true;
138
139 return false;
b2e7771e
JB		 140}
141
601ae7f2 142static int
1f7bba79
JB		 143ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
144 struct ieee80211_rx_status *status,
145 struct sk_buff *skb)
601ae7f2
BR		 146{
147 int len;
148
149 /* always present fields */
a144f378 150 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 151
a144f378 152 /* allocate extra bitmaps */
a144f378
JB		 153 if (status->chains)
154 len += 4 * hweight8(status->chains);
90b9e446
JB		 155
156 if (ieee80211_have_rx_timestamp(status)) {
157 len = ALIGN(len, 8);
601ae7f2 158 len += 8;
90b9e446 159 }
30686bf7 160 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 161 len += 1;
601ae7f2 162
a144f378
JB		 163 /* antenna field, if we don't have per-chain info */
164 if (!status->chains)
165 len += 1;
166
90b9e446
JB		 167 /* padding for RX_FLAGS if necessary */
168 len = ALIGN(len, 2);
601ae7f2 169
6d744bac
JB		 170 if (status->flag & RX_FLAG_HT) /* HT info */
171 len += 3;
172
4c298677 173 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 174 len = ALIGN(len, 4);
4c298677
JB		 175 len += 8;
176 }
177
51648921
JB		 178 if (status->flag & RX_FLAG_VHT) {
179 len = ALIGN(len, 2);
180 len += 12;
181 }
182
99ee7cae
JB		 183 if (local->hw.radiotap_timestamp.units_pos >= 0) {
184 len = ALIGN(len, 8);
185 len += 12;
186 }
187
a144f378
JB		 188 if (status->chains) {
189 /* antenna and antenna signal fields */
190 len += 2 * hweight8(status->chains);
191 }
192
1f7bba79
JB		 193 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
194 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
195
196 /* vendor presence bitmap */
197 len += 4;
198 /* alignment for fixed 6-byte vendor data header */
199 len = ALIGN(len, 2);
200 /* vendor data header */
201 len += 6;
202 if (WARN_ON(rtap->align == 0))
203 rtap->align = 1;
204 len = ALIGN(len, rtap->align);
205 len += rtap->len + rtap->pad;
206 }
207
601ae7f2
BR		 208 return len;
209}
210
00ea6deb 211/*
601ae7f2
BR		 212 * ieee80211_add_rx_radiotap_header - add radiotap header
213 *
214 * add a radiotap header containing all the fields which the hardware provided.
215 */
216static void
217ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
218 struct sk_buff *skb,
601ae7f2 219 struct ieee80211_rate *rate,
973ef21a 220 int rtap_len, bool has_fcs)
601ae7f2 221{
f1d58c25 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 223 struct ieee80211_radiotap_header *rthdr;
224 unsigned char *pos;
a144f378
JB		 225 __le32 *it_present;
226 u32 it_present_val;
6a86b9c7 227 u16 rx_flags = 0;
a5e70697 228 u16 channel_flags = 0;
a144f378
JB		 229 int mpdulen, chain;
230 unsigned long chains = status->chains;
1f7bba79
JB		 231 struct ieee80211_vendor_radiotap rtap = {};
232
233 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
234 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
235 /* rtap.len and rtap.pad are undone immediately */
236 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
237 }
f4bda337
TP		 238
239 mpdulen = skb->len;
30686bf7 240 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 241 mpdulen += FCS_LEN;
601ae7f2
BR		 242
243 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 244 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 245 it_present = &rthdr->it_present;
601ae7f2
BR		 246
247 /* radiotap header, set always present flags */
0059b2b1 248 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 249 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
250 BIT(IEEE80211_RADIOTAP_CHANNEL) |
251 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
252
253 if (!status->chains)
254 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
255
256 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
257 it_present_val |=
258 BIT(IEEE80211_RADIOTAP_EXT) |
259 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
260 put_unaligned_le32(it_present_val, it_present);
261 it_present++;
262 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
263 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
264 }
601ae7f2 265
1f7bba79
JB		 266 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
267 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
268 BIT(IEEE80211_RADIOTAP_EXT);
269 put_unaligned_le32(it_present_val, it_present);
270 it_present++;
271 it_present_val = rtap.present;
272 }
273
a144f378
JB		 274 put_unaligned_le32(it_present_val, it_present);
275
276 pos = (void *)(it_present + 1);
277
601ae7f2
BR		 278 /* the order of the following fields is important */
279
280 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 281 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 282 /* padding */
283 while ((pos - (u8 *)rthdr) & 7)
284 *pos++ = 0;
f4bda337
TP		 285 put_unaligned_le64(
286 ieee80211_calculate_rx_timestamp(local, status,
287 mpdulen, 0),
288 pos);
1df332e8 289 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 290 pos += 8;
291 }
292
293 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 294 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 295 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 296 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
297 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 298 if (status->flag & RX_FLAG_SHORTPRE)
299 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 300 pos++;
301
302 /* IEEE80211_RADIOTAP_RATE */
5614618e 303 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 304 /*
f8d1ccf1 305 * Without rate information don't add it. If we have,
38f37be2 306 * MCS information is a separate field in radiotap,
73b48099
JB		 307 * added below. The byte here is needed as padding
308 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 309 */
310 *pos = 0;
8d6f658e 311 } else {
2103dec1 312 int shift = 0;
ebe6c7ba 313 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 314 if (status->flag & RX_FLAG_10MHZ)
315 shift = 1;
316 else if (status->flag & RX_FLAG_5MHZ)
317 shift = 2;
318 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 319 }
601ae7f2
BR		 320 pos++;
321
322 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 323 put_unaligned_le16(status->freq, pos);
601ae7f2 324 pos += 2;
a5e70697
SW		 325 if (status->flag & RX_FLAG_10MHZ)
326 channel_flags |= IEEE80211_CHAN_HALF;
327 else if (status->flag & RX_FLAG_5MHZ)
328 channel_flags |= IEEE80211_CHAN_QUARTER;
329
57fbcce3 330 if (status->band == NL80211_BAND_5GHZ)
a5e70697 331 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 332 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 333 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 334 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 335 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 336 else if (rate)
3a5c5e81 337 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 338 else
a5e70697
SW		 339 channel_flags |= IEEE80211_CHAN_2GHZ;
340 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 341 pos += 2;
342
343 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 344 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 345 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 346 *pos = status->signal;
347 rthdr->it_present |=
348 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
349 pos++;
350 }
351
601ae7f2
BR		 352 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
353
a144f378
JB		 354 if (!status->chains) {
355 /* IEEE80211_RADIOTAP_ANTENNA */
356 *pos = status->antenna;
357 pos++;
358 }
601ae7f2 359
601ae7f2
BR		 360 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
361
362 /* IEEE80211_RADIOTAP_RX_FLAGS */
363 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 364 if ((pos - (u8 *)rthdr) & 1)
90b9e446 365 *pos++ = 0;
aae89831 366 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 367 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
368 put_unaligned_le16(rx_flags, pos);
601ae7f2 369 pos += 2;
6d744bac
JB		 370
371 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 372 unsigned int stbc;
373
6d744bac 374 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 375 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 376 *pos = 0;
377 if (status->flag & RX_FLAG_SHORT_GI)
378 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
379 if (status->flag & RX_FLAG_40MHZ)
380 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 381 if (status->flag & RX_FLAG_HT_GF)
382 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
63c361f5
EG		 383 if (status->flag & RX_FLAG_LDPC)
384 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
786677d1
OR		 385 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
386 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 387 pos++;
388 *pos++ = status->rate_idx;
389 }
4c298677
JB		 390
391 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
392 u16 flags = 0;
393
394 /* ensure 4 byte alignment */
395 while ((pos - (u8 *)rthdr) & 3)
396 pos++;
397 rthdr->it_present |=
398 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
399 put_unaligned_le32(status->ampdu_reference, pos);
400 pos += 4;
4c298677
JB		 401 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
402 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
403 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
404 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
405 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
406 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
407 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
408 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
409 put_unaligned_le16(flags, pos);
410 pos += 2;
411 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
412 *pos++ = status->ampdu_delimiter_crc;
413 else
414 *pos++ = 0;
415 *pos++ = 0;
416 }
90b9e446 417
51648921
JB		 418 if (status->flag & RX_FLAG_VHT) {
419 u16 known = local->hw.radiotap_vht_details;
420
421 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 422 put_unaligned_le16(known, pos);
423 pos += 2;
424 /* flags */
425 if (status->flag & RX_FLAG_SHORT_GI)
426 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 427 /* in VHT, STBC is binary */
428 if (status->flag & RX_FLAG_STBC_MASK)
429 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 430 if (status->vht_flag & RX_VHT_FLAG_BF)
431 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 432 pos++;
433 /* bandwidth */
1b8d242a 434 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 435 *pos++ = 4;
1b8d242a 436 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 437 *pos++ = 11;
438 else if (status->flag & RX_FLAG_40MHZ)
439 *pos++ = 1;
440 else /* 20 MHz */
441 *pos++ = 0;
442 /* MCS/NSS */
443 *pos = (status->rate_idx << 4) | status->vht_nss;
444 pos += 4;
445 /* coding field */
63c361f5
EG		 446 if (status->flag & RX_FLAG_LDPC)
447 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 448 pos++;
449 /* group ID */
450 pos++;
451 /* partial_aid */
452 pos += 2;
453 }
454
99ee7cae
JB		 455 if (local->hw.radiotap_timestamp.units_pos >= 0) {
456 u16 accuracy = 0;
457 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
458
459 rthdr->it_present |=
460 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
461
462 /* ensure 8 byte alignment */
463 while ((pos - (u8 *)rthdr) & 7)
464 pos++;
465
466 put_unaligned_le64(status->device_timestamp, pos);
467 pos += sizeof(u64);
468
469 if (local->hw.radiotap_timestamp.accuracy >= 0) {
470 accuracy = local->hw.radiotap_timestamp.accuracy;
471 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
472 }
473 put_unaligned_le16(accuracy, pos);
474 pos += sizeof(u16);
475
476 *pos++ = local->hw.radiotap_timestamp.units_pos;
477 *pos++ = flags;
478 }
479
a144f378
JB		 480 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
481 *pos++ = status->chain_signal[chain];
482 *pos++ = chain;
483 }
1f7bba79
JB		 484
485 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
486 /* ensure 2 byte alignment for the vendor field as required */
487 if ((pos - (u8 *)rthdr) & 1)
488 *pos++ = 0;
489 *pos++ = rtap.oui[0];
490 *pos++ = rtap.oui[1];
491 *pos++ = rtap.oui[2];
492 *pos++ = rtap.subns;
493 put_unaligned_le16(rtap.len, pos);
494 pos += 2;
495 /* align the actual payload as requested */
496 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
497 *pos++ = 0;
498 /* data (and possible padding) already follows */
499 }
601ae7f2
BR		 500}
501
b2e7771e
JB		 502/*
503 * This function copies a received frame to all monitor interfaces and
504 * returns a cleaned-up SKB that no longer includes the FCS nor the
505 * radiotap header the driver might have added.
506 */
507static struct sk_buff *
508ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 509 struct ieee80211_rate *rate)
b2e7771e 510{
f1d58c25 511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 512 struct ieee80211_sub_if_data *sdata;
1f7bba79 513 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 514 struct sk_buff *skb, *skb2;
515 struct net_device *prev_dev = NULL;
516 int present_fcs_len = 0;
1f7bba79 517 unsigned int rtap_vendor_space = 0;
42bd20d9
AE		 518 struct ieee80211_mgmt *mgmt;
519 struct ieee80211_sub_if_data *monitor_sdata =
520 rcu_dereference(local->monitor_sdata);
1f7bba79
JB		 521
522 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
523 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
524
525 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
526 }
b2e7771e
JB		 527
528 /*
529 * First, we may need to make a copy of the skb because
530 * (1) we need to modify it for radiotap (if not present), and
531 * (2) the other RX handlers will modify the skb we got.
532 *
533 * We don't need to, of course, if we aren't going to return
534 * the SKB because it has a bad FCS/PLCP checksum.
535 */
0869aea0 536
30686bf7 537 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
b2e7771e
JB		 538 present_fcs_len = FCS_LEN;
539
1f7bba79
JB		 540 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
541 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 542 dev_kfree_skb(origskb);
543 return NULL;
544 }
545
17883048 546 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
1f7bba79
JB		 547 if (should_drop_frame(origskb, present_fcs_len,
548 rtap_vendor_space)) {
b2e7771e
JB		 549 dev_kfree_skb(origskb);
550 return NULL;
551 }
552
1f7bba79 553 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 554 }
555
751413ea 556 /* room for the radiotap header based on driver features */
1f7bba79
JB		 557 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
558 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 559
1f7bba79 560 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 561 /* only need to expand headroom if necessary */
562 skb = origskb;
563 origskb = NULL;
564
565 /*
566 * This shouldn't trigger often because most devices have an
567 * RX header they pull before we get here, and that should
568 * be big enough for our radiotap information. We should
569 * probably export the length to drivers so that we can have
570 * them allocate enough headroom to start with.
571 */
572 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 573 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 574 dev_kfree_skb(skb);
575 return NULL;
576 }
577 } else {
578 /*
579 * Need to make a copy and possibly remove radiotap header
580 * and FCS from the original.
581 */
582 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
583
1f7bba79
JB		 584 origskb = remove_monitor_info(local, origskb,
585 rtap_vendor_space);
b2e7771e
JB		 586
587 if (!skb)
588 return origskb;
589 }
590
0869aea0 591 /* prepend radiotap information */
1f7bba79 592 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 593
ce3edf6d 594 skb_reset_mac_header(skb);
b2e7771e
JB		 595 skb->ip_summed = CHECKSUM_UNNECESSARY;
596 skb->pkt_type = PACKET_OTHERHOST;
597 skb->protocol = htons(ETH_P_802_2);
598
599 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 600 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 601 continue;
602
d8212184 603 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
3d30d949
MW		 604 continue;
605
9607e6b6 606 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 607 continue;
608
b2e7771e
JB		 609 if (prev_dev) {
610 skb2 = skb_clone(skb, GFP_ATOMIC);
611 if (skb2) {
612 skb2->dev = prev_dev;
5548a8a1 613 netif_receive_skb(skb2);
b2e7771e
JB		 614 }
615 }
616
617 prev_dev = sdata->dev;
5a490510 618 ieee80211_rx_stats(sdata->dev, skb->len);
b2e7771e
JB		 619 }
620
42bd20d9
AE		 621 mgmt = (void *)skb->data;
622 if (monitor_sdata &&
623 skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
624 ieee80211_is_action(mgmt->frame_control) &&
625 mgmt->u.action.category == WLAN_CATEGORY_VHT &&
626 mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
627 is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
628 ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
629 struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);
630
631 if (mu_skb) {
632 mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
633 skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
634 ieee80211_queue_work(&local->hw, &monitor_sdata->work);
635 }
636 }
637
b2e7771e
JB		 638 if (prev_dev) {
639 skb->dev = prev_dev;
5548a8a1 640 netif_receive_skb(skb);
b2e7771e
JB		 641 } else
642 dev_kfree_skb(skb);
643
644 return origskb;
645}
646
5cf121c3 647static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 648{
238f74a2 649 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 650 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 651 int tid, seqno_idx, security_idx;
6e0d114d
JB		 652
653 /* does the frame have a qos control field? */
238f74a2
HH		 654 if (ieee80211_is_data_qos(hdr->frame_control)) {
655 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 656 /* frame has qos control */
238f74a2 657 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 658 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 659 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 660
661 seqno_idx = tid;
662 security_idx = tid;
6e0d114d 663 } else {
1411f9b5
JB		 664 /*
665 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
666 *
667 * Sequence numbers for management frames, QoS data
668 * frames with a broadcast/multicast address in the
669 * Address 1 field, and all non-QoS data frames sent
670 * by QoS STAs are assigned using an additional single
671 * modulo-4096 counter, [...]
672 *
673 * We also use that counter for non-QoS STAs.
674 */
5a306f58 675 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 676 security_idx = 0;
677 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 678 security_idx = IEEE80211_NUM_TIDS;
9e26297a 679 tid = 0;
6e0d114d 680 }
52865dfd 681
9e26297a
JB		 682 rx->seqno_idx = seqno_idx;
683 rx->security_idx = security_idx;
6e0d114d
JB		 684 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
685 * For now, set skb->priority to 0 for other cases. */
686 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 687}
6e0d114d 688
d1c3a37c
JB		 689/**
690 * DOC: Packet alignment
691 *
692 * Drivers always need to pass packets that are aligned to two-byte boundaries
693 * to the stack.
694 *
695 * Additionally, should, if possible, align the payload data in a way that
696 * guarantees that the contained IP header is aligned to a four-byte
697 * boundary. In the case of regular frames, this simply means aligning the
698 * payload to a four-byte boundary (because either the IP header is directly
699 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 700 * in front of it). If the payload data is not properly aligned and the
701 * architecture doesn't support efficient unaligned operations, mac80211
702 * will align the data.
d1c3a37c
JB		 703 *
704 * With A-MSDU frames, however, the payload data address must yield two modulo
705 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
706 * push the IP header further back to a multiple of four again. Thankfully, the
707 * specs were sane enough this time around to require padding each A-MSDU
708 * subframe to a length that is a multiple of four.
709 *
25985edc 710 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 711 * the payload is not supported, the driver is required to move the 802.11
712 * header to be directly in front of the payload in that case.
713 */
714static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 715{
59d9cb07 716#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 717 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 718#endif
6e0d114d
JB		 719}
720
6368e4b1 721
571ecf67
JB		 722/* rx handlers */
723
3cfcf6ac
JM		 724static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
725{
726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
727
d8ca16db 728 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 729 return 0;
730
d8ca16db 731 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 732}
733
734
735static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
736{
737 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
738
d8ca16db 739 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 740 return 0;
741
d8ca16db 742 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 743}
744
745
746/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
747static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
748{
749 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
750 struct ieee80211_mmie *mmie;
56c52da2 751 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 752
1df332e8 753 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 754 return -1;
755
d8ca16db 756 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 757 return -1; /* not a robust management frame */
758
759 mmie = (struct ieee80211_mmie *)
760 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 761 if (mmie->element_id == WLAN_EID_MMIE &&
762 mmie->length == sizeof(*mmie) - 2)
763 return le16_to_cpu(mmie->key_id);
764
765 mmie16 = (struct ieee80211_mmie_16 *)
766 (skb->data + skb->len - sizeof(*mmie16));
767 if (skb->len >= 24 + sizeof(*mmie16) &&
768 mmie16->element_id == WLAN_EID_MMIE &&
769 mmie16->length == sizeof(*mmie16) - 2)
770 return le16_to_cpu(mmie16->key_id);
771
772 return -1;
3cfcf6ac
JM		 773}
774
2c61cf9c
JB		 775static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
776 struct sk_buff *skb)
2475b1cc
MS		 777{
778 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
779 __le16 fc;
780 int hdrlen;
781 u8 keyid;
782
783 fc = hdr->frame_control;
784 hdrlen = ieee80211_hdrlen(fc);
785
786 if (skb->len < hdrlen + cs->hdr_len)
787 return -EINVAL;
788
789 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
790 keyid &= cs->key_idx_mask;
791 keyid >>= cs->key_idx_shift;
792
793 return keyid;
794}
795
1df332e8 796static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 797{
a7767f95 798 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 799 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 800
a7767f95 801 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 802 if (is_multicast_ether_addr(hdr->addr1)) {
803 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 804 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 805 return RX_DROP_MONITOR;
b203ca39 806 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 807 return RX_DROP_MONITOR;
808 } else {
809 if (!ieee80211_has_a4(hdr->frame_control))
810 return RX_DROP_MONITOR;
b203ca39 811 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 812 return RX_DROP_MONITOR;
813 }
33b64eb2
LCC		 814 }
815
816 /* If there is not an established peer link and this is not a peer link
817 * establisment frame, beacon or probe, drop the frame.
818 */
819
57cf8043 820 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 821 struct ieee80211_mgmt *mgmt;
d6d1a5a7 822
a7767f95 823 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 824 return RX_DROP_MONITOR;
825
a7767f95 826 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 827 u8 category;
9b395bc3
JB		 828
829 /* make sure category field is present */
830 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
831 return RX_DROP_MONITOR;
832
33b64eb2 833 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 834 category = mgmt->u.action.category;
835 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 836 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 837 return RX_DROP_MONITOR;
33b64eb2 838 return RX_CONTINUE;
33b64eb2
LCC		 839 }
840
a7767f95
HH		 841 if (ieee80211_is_probe_req(hdr->frame_control) ||
842 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 843 ieee80211_is_beacon(hdr->frame_control) ||
844 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 845 return RX_CONTINUE;
846
847 return RX_DROP_MONITOR;
a7767f95
HH		 848 }
849
902acc78
JB		 850 return RX_CONTINUE;
851}
33b64eb2 852
fb4ea054
JB		 853static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
854 int index)
855{
856 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
857 struct sk_buff *tail = skb_peek_tail(frames);
858 struct ieee80211_rx_status *status;
859
06470f74
SS		 860 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
861 return true;
862
fb4ea054
JB		 863 if (!tail)
864 return false;
865
866 status = IEEE80211_SKB_RXCB(tail);
867 if (status->flag & RX_FLAG_AMSDU_MORE)
868 return false;
869
870 return true;
871}
872
d3b2fb53 873static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 874 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 875 int index,
876 struct sk_buff_head *frames)
1edfb1af 877{
83eb935e
MK		 878 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
879 struct sk_buff *skb;
4cfda47b 880 struct ieee80211_rx_status *status;
1edfb1af 881
dd318575
JB		 882 lockdep_assert_held(&tid_agg_rx->reorder_lock);
883
83eb935e 884 if (skb_queue_empty(skb_list))
1edfb1af
JB		 885 goto no_frame;
886
fb4ea054 887 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
83eb935e
MK		 888 __skb_queue_purge(skb_list);
889 goto no_frame;
890 }
891
892 /* release frames from the reorder ring buffer */
1edfb1af 893 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 894 while ((skb = __skb_dequeue(skb_list))) {
895 status = IEEE80211_SKB_RXCB(skb);
896 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
897 __skb_queue_tail(frames, skb);
898 }
1edfb1af
JB		 899
900no_frame:
06470f74 901 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
9a886586 902 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 903}
904
d3b2fb53 905static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 906 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 907 u16 head_seq_num,
908 struct sk_buff_head *frames)
1edfb1af
JB		 909{
910 int index;
911
dd318575
JB		 912 lockdep_assert_held(&tid_agg_rx->reorder_lock);
913
9a886586 914 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 915 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 916 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
917 frames);
1edfb1af
JB		 918 }
919}
920
921/*
922 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
923 * the skb was added to the buffer longer than this time ago, the earlier
924 * frames that have not yet been received are assumed to be lost and the skb
925 * can be released for processing. This may also release other skb's from the
926 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 927 *
928 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 929 */
930#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
931
d3b2fb53 932static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 933 struct tid_ampdu_rx *tid_agg_rx,
934 struct sk_buff_head *frames)
aa0c8636 935{
83eb935e 936 int index, i, j;
aa0c8636 937
dd318575
JB		 938 lockdep_assert_held(&tid_agg_rx->reorder_lock);
939
aa0c8636 940 /* release the buffer until next missing frame */
2e3049b7 941 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
fb4ea054 942 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
07ae2dfc 943 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 944 /*
945 * No buffers ready to be released, but check whether any
946 * frames in the reorder buffer have timed out.
947 */
aa0c8636
CL		 948 int skipped = 1;
949 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
950 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 951 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
aa0c8636
CL		 952 skipped++;
953 continue;
954 }
499fe9a4
DH		 955 if (skipped &&
956 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 957 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 958 goto set_release_timer;
aa0c8636 959
83eb935e
MK		 960 /* don't leave incomplete A-MSDUs around */
961 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
962 i = (i + 1) % tid_agg_rx->buf_size)
963 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
964
bdcbd8e0
JB		 965 ht_dbg_ratelimited(sdata,
966 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 967 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
968 frames);
aa0c8636
CL		 969
970 /*
971 * Increment the head seq# also for the skipped slots.
972 */
973 tid_agg_rx->head_seq_num =
9a886586
JB		 974 (tid_agg_rx->head_seq_num +
975 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 976 skipped = 0;
977 }
fb4ea054 978 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
f9e124fb
CL		 979 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
980 frames);
2e3049b7 981 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 982 }
2bff8ebf
CL		 983
984 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 985 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 986
987 for (; j != (index - 1) % tid_agg_rx->buf_size;
988 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 989 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
2bff8ebf
CL		 990 break;
991 }
992
993 set_release_timer:
994
788211d8
JB		 995 if (!tid_agg_rx->removed)
996 mod_timer(&tid_agg_rx->reorder_timer,
997 tid_agg_rx->reorder_time[j] + 1 +
998 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 999 } else {
1000 del_timer(&tid_agg_rx->reorder_timer);
1001 }
aa0c8636
CL		 1002}
1003
1edfb1af
JB		 1004/*
1005 * As this function belongs to the RX path it must be under
1006 * rcu_read_lock protection. It returns false if the frame
1007 * can be processed immediately, true if it was consumed.
1008 */
d3b2fb53 1009static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 1010 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1011 struct sk_buff *skb,
1012 struct sk_buff_head *frames)
1edfb1af
JB		 1013{
1014 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 1015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 1016 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1017 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1018 u16 head_seq_num, buf_size;
1019 int index;
2bff8ebf 1020 bool ret = true;
1edfb1af 1021
dd318575
JB		 1022 spin_lock(&tid_agg_rx->reorder_lock);
1023
4549cf2b
MK		 1024 /*
1025 * Offloaded BA sessions have no known starting sequence number so pick
1026 * one from first Rxed frame for this tid after BA was started.
1027 */
1028 if (unlikely(tid_agg_rx->auto_seq)) {
1029 tid_agg_rx->auto_seq = false;
1030 tid_agg_rx->ssn = mpdu_seq_num;
1031 tid_agg_rx->head_seq_num = mpdu_seq_num;
1032 }
1033
1edfb1af
JB		 1034 buf_size = tid_agg_rx->buf_size;
1035 head_seq_num = tid_agg_rx->head_seq_num;
1036
1037 /* frame with out of date sequence number */
9a886586 1038 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 1039 dev_kfree_skb(skb);
2bff8ebf 1040 goto out;
1edfb1af
JB		 1041 }
1042
1043 /*
1044 * If frame the sequence number exceeds our buffering window
1045 * size release some previous frames to make room for this one.
1046 */
9a886586
JB		 1047 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1048 head_seq_num = ieee80211_sn_inc(
1049 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 1050 /* release stored frames up to new head to stack */
d3b2fb53 1051 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 1052 head_seq_num, frames);
1edfb1af
JB		 1053 }
1054
1055 /* Now the new frame is always in the range of the reordering buffer */
1056
2e3049b7 1057 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 1058
1059 /* check if we already stored this frame */
fb4ea054 1060 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1edfb1af 1061 dev_kfree_skb(skb);
2bff8ebf 1062 goto out;
1edfb1af
JB		 1063 }
1064
1065 /*
1066 * If the current MPDU is in the right order and nothing else
1067 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 1068 * If it is first but there's something stored, we may be able
1069 * to release frames after this one.
1edfb1af
JB		 1070 */
1071 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1072 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1073 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1074 tid_agg_rx->head_seq_num =
1075 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1076 ret = false;
1077 goto out;
1edfb1af
JB		 1078 }
1079
1080 /* put the frame in the reordering buffer */
83eb935e
MK		 1081 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1082 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1083 tid_agg_rx->reorder_time[index] = jiffies;
1084 tid_agg_rx->stored_mpdu_num++;
1085 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1086 }
1edfb1af 1087
2bff8ebf
CL		 1088 out:
1089 spin_unlock(&tid_agg_rx->reorder_lock);
1090 return ret;
1edfb1af
JB		 1091}
1092
1093/*
1094 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1095 * true if the MPDU was buffered, false if it should be processed.
1096 */
f9e124fb
CL		 1097static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1098 struct sk_buff_head *frames)
1edfb1af 1099{
2569a826
JB		 1100 struct sk_buff *skb = rx->skb;
1101 struct ieee80211_local *local = rx->local;
1edfb1af 1102 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1103 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1104 struct tid_ampdu_rx *tid_agg_rx;
1105 u16 sc;
6cc00d54 1106 u8 tid, ack_policy;
1edfb1af 1107
051a41fa
JB		 1108 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1109 is_multicast_ether_addr(hdr->addr1))
2569a826 1110 goto dont_reorder;
1edfb1af
JB		 1111
1112 /*
1113 * filter the QoS data rx stream according to
1114 * STA/TID and check if this STA/TID is on aggregation
1115 */
1116
1edfb1af 1117 if (!sta)
2569a826 1118 goto dont_reorder;
1edfb1af 1119
6cc00d54
TP		 1120 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1121 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1122 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1123
a87f736d 1124 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
bfe40fa3
JB		 1125 if (!tid_agg_rx) {
1126 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1127 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1128 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1129 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1130 WLAN_BACK_RECIPIENT,
1131 WLAN_REASON_QSTA_REQUIRE_SETUP);
a87f736d 1132 goto dont_reorder;
bfe40fa3 1133 }
1edfb1af
JB		 1134
1135 /* qos null data frames are excluded */
1136 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1137 goto dont_reorder;
1edfb1af 1138
6cc00d54
TP		 1139 /* not part of a BA session */
1140 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1141 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1142 goto dont_reorder;
1143
1edfb1af
JB		 1144 /* new, potentially un-ordered, ampdu frame - process it */
1145
1146 /* reset session timer */
1147 if (tid_agg_rx->timeout)
12d3952f 1148 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1149
1150 /* if this mpdu is fragmented - terminate rx aggregation session */
1151 sc = le16_to_cpu(hdr->seq_ctrl);
1152 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1153 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1154 skb_queue_tail(&rx->sdata->skb_queue, skb);
1155 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1156 return;
1edfb1af
JB		 1157 }
1158
a87f736d
JB		 1159 /*
1160 * No locking needed -- we will only ever process one
1161 * RX packet at a time, and thus own tid_agg_rx. All
1162 * other code manipulating it needs to (and does) make
1163 * sure that we cannot get to it any more before doing
1164 * anything with it.
1165 */
f9e124fb
CL		 1166 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1167 frames))
2569a826
JB		 1168 return;
1169
1170 dont_reorder:
f9e124fb 1171 __skb_queue_tail(frames, skb);
1edfb1af 1172}
33b64eb2 1173
49461622 1174static ieee80211_rx_result debug_noinline
0395442a 1175ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1176{
a7767f95 1177 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1178 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1179
f9cfa5f3
SS		 1180 if (status->flag & RX_FLAG_DUP_VALIDATED)
1181 return RX_CONTINUE;
1182
6b0f3274
JB		 1183 /*
1184 * Drop duplicate 802.11 retransmissions
1185 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1186 */
0395442a
JB		 1187
1188 if (rx->skb->len < 24)
1189 return RX_CONTINUE;
1190
1191 if (ieee80211_is_ctl(hdr->frame_control) ||
1192 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1193 is_multicast_ether_addr(hdr->addr1))
1194 return RX_CONTINUE;
1195
a732fa70
JB		 1196 if (!rx->sta)
1197 return RX_CONTINUE;
1198
1199 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1200 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1201 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1202 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1203 return RX_DROP_UNUSABLE;
1204 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1205 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1206 }
1207
0395442a
JB		 1208 return RX_CONTINUE;
1209}
1210
1211static ieee80211_rx_result debug_noinline
1212ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1213{
1214 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1215
571ecf67
JB		 1216 /* Drop disallowed frame classes based on STA auth/assoc state;
1217 * IEEE 802.11, Chap 5.5.
1218 *
ccd7b362
JB		 1219 * mac80211 filters only based on association state, i.e. it drops
1220 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1221 * deauth/disassoc frames when needed. In addition, hostapd is
1222 * responsible for filtering on both auth and assoc states.
1223 */
33b64eb2 1224
902acc78 1225 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1226 return ieee80211_rx_mesh_check(rx);
33b64eb2 1227
a7767f95
HH		 1228 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1229 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1230 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1231 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1232 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1233 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1234 /*
1235 * accept port control frames from the AP even when it's not
1236 * yet marked ASSOC to prevent a race where we don't set the
1237 * assoc bit quickly enough before it sends the first frame
1238 */
1239 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1240 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1241 unsigned int hdrlen;
1242 __be16 ethertype;
1243
1244 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1245
1246 if (rx->skb->len < hdrlen + 8)
1247 return RX_DROP_MONITOR;
1248
1249 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1250 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1251 return RX_CONTINUE;
1252 }
21fc7560
JB		 1253
1254 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1255 cfg80211_rx_spurious_frame(rx->sdata->dev,
1256 hdr->addr2,
1257 GFP_ATOMIC))
1258 return RX_DROP_UNUSABLE;
1259
e4c26add 1260 return RX_DROP_MONITOR;
2a33bee2 1261 }
571ecf67 1262
9ae54c84 1263 return RX_CONTINUE;
570bd537
JB		 1264}
1265
1266
572e0012
KV		 1267static ieee80211_rx_result debug_noinline
1268ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1269{
1270 struct ieee80211_local *local;
1271 struct ieee80211_hdr *hdr;
1272 struct sk_buff *skb;
1273
1274 local = rx->local;
1275 skb = rx->skb;
1276 hdr = (struct ieee80211_hdr *) skb->data;
1277
1278 if (!local->pspolling)
1279 return RX_CONTINUE;
1280
1281 if (!ieee80211_has_fromds(hdr->frame_control))
1282 /* this is not from AP */
1283 return RX_CONTINUE;
1284
1285 if (!ieee80211_is_data(hdr->frame_control))
1286 return RX_CONTINUE;
1287
1288 if (!ieee80211_has_moredata(hdr->frame_control)) {
1289 /* AP has no more frames buffered for us */
1290 local->pspolling = false;
1291 return RX_CONTINUE;
1292 }
1293
1294 /* more data bit is set, let's request a new frame from the AP */
1295 ieee80211_send_pspoll(local, rx->sdata);
1296
1297 return RX_CONTINUE;
1298}
1299
d012a605 1300static void sta_ps_start(struct sta_info *sta)
571ecf67 1301{
133b8226 1302 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1303 struct ieee80211_local *local = sdata->local;
d012a605 1304 struct ps_data *ps;
ba8c3d6f 1305 int tid;
0795af57 1306
d012a605
MP		 1307 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1308 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1309 ps = &sdata->bss->ps;
1310 else
1311 return;
1312
1313 atomic_inc(&ps->num_sta_ps);
c2c98fde 1314 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1315 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1316 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1317 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1318 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1319
17c18bf8
JB		 1320 ieee80211_clear_fast_xmit(sta);
1321
ba8c3d6f
FF		 1322 if (!sta->sta.txq[0])
1323 return;
1324
1325 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
bb42f2d1 1326 if (txq_has_queue(sta->sta.txq[tid]))
ba8c3d6f
FF		 1327 set_bit(tid, &sta->txq_buffered_tids);
1328 else
1329 clear_bit(tid, &sta->txq_buffered_tids);
1330 }
571ecf67
JB		 1331}
1332
d012a605 1333static void sta_ps_end(struct sta_info *sta)
571ecf67 1334{
bdcbd8e0
JB		 1335 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1336 sta->sta.addr, sta->sta.aid);
004c872e 1337
c2c98fde 1338 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1339 /*
1340 * Clear the flag only if the other one is still set
1341 * so that the TX path won't start TX'ing new frames
1342 * directly ... In the case that the driver flag isn't
1343 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1344 */
1345 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1346 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1347 sta->sta.addr, sta->sta.aid);
af818581
JB		 1348 return;
1349 }
1350
5ac2e350
JB		 1351 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1352 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1353 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1354}
1355
cf47161a 1356int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1357{
cf47161a 1358 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1359 bool in_ps;
1360
cf47161a 1361 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1362
1363 /* Don't let the same PS state be set twice */
cf47161a 1364 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1365 if ((start && in_ps) || (!start && !in_ps))
1366 return -EINVAL;
1367
1368 if (start)
cf47161a 1369 sta_ps_start(sta);
d057e5a3 1370 else
cf47161a 1371 sta_ps_end(sta);
d057e5a3
AN		 1372
1373 return 0;
1374}
1375EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1376
46fa38e8
JB		 1377void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1378{
1379 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1380
1381 if (test_sta_flag(sta, WLAN_STA_SP))
1382 return;
1383
1384 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1385 ieee80211_sta_ps_deliver_poll_response(sta);
1386 else
1387 set_sta_flag(sta, WLAN_STA_PSPOLL);
1388}
1389EXPORT_SYMBOL(ieee80211_sta_pspoll);
1390
1391void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1392{
1393 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1394 u8 ac = ieee802_1d_to_ac[tid & 7];
1395
1396 /*
1397 * If this AC is not trigger-enabled do nothing.
1398 *
1399 * NB: This could/should check a separate bitmap of trigger-
1400 * enabled queues, but for now we only implement uAPSD w/o
1401 * TSPEC changes to the ACs, so they're always the same.
1402 */
1403 if (!(sta->sta.uapsd_queues & BIT(ac)))
1404 return;
1405
1406 /* if we are in a service period, do nothing */
1407 if (test_sta_flag(sta, WLAN_STA_SP))
1408 return;
1409
1410 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1411 ieee80211_sta_ps_deliver_uapsd(sta);
1412 else
1413 set_sta_flag(sta, WLAN_STA_UAPSD);
1414}
1415EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1416
47086fc5
JB		 1417static ieee80211_rx_result debug_noinline
1418ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1419{
1420 struct ieee80211_sub_if_data *sdata = rx->sdata;
1421 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1422 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
47086fc5 1423
5c90067c 1424 if (!rx->sta)
47086fc5
JB		 1425 return RX_CONTINUE;
1426
1427 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1428 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1429 return RX_CONTINUE;
1430
1431 /*
1432 * The device handles station powersave, so don't do anything about
1433 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1434 * it to mac80211 since they're handled.)
1435 */
30686bf7 1436 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1437 return RX_CONTINUE;
1438
1439 /*
1440 * Don't do anything if the station isn't already asleep. In
1441 * the uAPSD case, the station will probably be marked asleep,
1442 * in the PS-Poll case the station must be confused ...
1443 */
c2c98fde 1444 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1445 return RX_CONTINUE;
1446
1447 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
46fa38e8 1448 ieee80211_sta_pspoll(&rx->sta->sta);
47086fc5
JB		 1449
1450 /* Free PS Poll skb here instead of returning RX_DROP that would
1451 * count as an dropped frame. */
1452 dev_kfree_skb(rx->skb);
1453
1454 return RX_QUEUED;
1455 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1456 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1457 ieee80211_has_pm(hdr->frame_control) &&
1458 (ieee80211_is_data_qos(hdr->frame_control) ||
1459 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
46fa38e8 1460 u8 tid;
47086fc5 1461
46fa38e8 1462 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
47086fc5 1463
46fa38e8 1464 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
47086fc5
JB		 1465 }
1466
1467 return RX_CONTINUE;
1468}
1469
49461622 1470static ieee80211_rx_result debug_noinline
5cf121c3 1471ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1472{
1473 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1474 struct sk_buff *skb = rx->skb;
1475 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1477 int i;
571ecf67
JB		 1478
1479 if (!sta)
9ae54c84 1480 return RX_CONTINUE;
571ecf67 1481
b291ba11
JB		 1482 /*
1483 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1484 * BSSID and for station already AUTHORIZED to avoid keeping the
1485 * current IBSS network alive in cases where other STAs start
1486 * using different BSSID. This will also give the station another
1487 * chance to restart the authentication/authorization in case
1488 * something went wrong the first time.
b291ba11 1489 */
05c914fe 1490 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1491 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1492 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1493 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1494 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1495 sta->rx_stats.last_rx = jiffies;
f4ebddf9 1496 if (ieee80211_is_data(hdr->frame_control) &&
4f6b1b3d
JB		 1497 !is_multicast_ether_addr(hdr->addr1))
1498 sta->rx_stats.last_rate =
1499 sta_stats_encode_rate(status);
3af6334c 1500 }
239281f8 1501 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1502 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1503 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1504 /*
33b64eb2
LCC		 1505 * Mesh beacons will update last_rx when if they are found to
1506 * match the current local configuration when processed.
571ecf67 1507 */
e5a9f8d0 1508 sta->rx_stats.last_rx = jiffies;
4f6b1b3d
JB		 1509 if (ieee80211_is_data(hdr->frame_control))
1510 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
571ecf67
JB		 1511 }
1512
3cf335d5
KV		 1513 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1514 ieee80211_sta_rx_notify(rx->sdata, hdr);
1515
e5a9f8d0 1516 sta->rx_stats.fragments++;
0f9c5a61
JB		 1517
1518 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
e5a9f8d0 1519 sta->rx_stats.bytes += rx->skb->len;
0f9c5a61
JB		 1520 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1521
fe8431f8 1522 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0 1523 sta->rx_stats.last_signal = status->signal;
0be6ed13 1524 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
fe8431f8 1525 }
571ecf67 1526
ef0621e8 1527 if (status->chains) {
e5a9f8d0 1528 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1529 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1530 int signal = status->chain_signal[i];
1531
1532 if (!(status->chains & BIT(i)))
1533 continue;
1534
e5a9f8d0 1535 sta->rx_stats.chain_signal_last[i] = signal;
0be6ed13 1536 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
e5a9f8d0 1537 -signal);
ef0621e8
FF		 1538 }
1539 }
1540
72eaa43a
JB		 1541 /*
1542 * Change STA power saving mode only at the end of a frame
1543 * exchange sequence.
1544 */
30686bf7 1545 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1546 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1547 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1548 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1549 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1550 /* PM bit is only checked in frames where it isn't reserved,
1551 * in AP mode it's reserved in non-bufferable management frames
1552 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1553 */
1554 (!ieee80211_is_mgmt(hdr->frame_control) ||
1555 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1556 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1557 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1558 sta_ps_end(sta);
72eaa43a
JB		 1559 } else {
1560 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1561 sta_ps_start(sta);
72eaa43a 1562 }
571ecf67
JB		 1563 }
1564
3f52b7e3
MP		 1565 /* mesh power save support */
1566 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1567 ieee80211_mps_rx_h_sta_process(sta, hdr);
1568
22403def
JB		 1569 /*
1570 * Drop (qos-)data::nullfunc frames silently, since they
1571 * are used only to control station power saving mode.
1572 */
1573 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1574 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1575 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1576
1577 /*
1578 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1579 * that was not moved to a 4-addr STA vlan yet send
1580 * the event to userspace and for older hostapd drop
1581 * the frame to the monitor interface.
d524215f
FF		 1582 */
1583 if (ieee80211_has_a4(hdr->frame_control) &&
1584 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1585 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1586 !rx->sdata->u.vlan.sta))) {
1587 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1588 cfg80211_rx_unexpected_4addr_frame(
1589 rx->sdata->dev, sta->sta.addr,
1590 GFP_ATOMIC);
d524215f 1591 return RX_DROP_MONITOR;
e7f4a940 1592 }
22403def
JB		 1593 /*
1594 * Update counter and free packet here to avoid
1595 * counting this as a dropped packed.
1596 */
e5a9f8d0 1597 sta->rx_stats.packets++;
571ecf67 1598 dev_kfree_skb(rx->skb);
9ae54c84 1599 return RX_QUEUED;
571ecf67
JB		 1600 }
1601
9ae54c84 1602 return RX_CONTINUE;
571ecf67
JB		 1603} /* ieee80211_rx_h_sta_process */
1604
86c228a7
JA		 1605static ieee80211_rx_result debug_noinline
1606ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1607{
1608 struct sk_buff *skb = rx->skb;
1609 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1611 int keyidx;
1612 int hdrlen;
1613 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1614 struct ieee80211_key *sta_ptk = NULL;
1615 int mmie_keyidx = -1;
1616 __le16 fc;
2475b1cc 1617 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1618
1619 /*
1620 * Key selection 101
1621 *
1622 * There are four types of keys:
1623 * - GTK (group keys)
1624 * - IGTK (group keys for management frames)
1625 * - PTK (pairwise keys)
1626 * - STK (station-to-station pairwise keys)
1627 *
1628 * When selecting a key, we have to distinguish between multicast
1629 * (including broadcast) and unicast frames, the latter can only
1630 * use PTKs and STKs while the former always use GTKs and IGTKs.
1631 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1632 * unicast frames can also use key indices like GTKs. Hence, if we
1633 * don't have a PTK/STK we check the key index for a WEP key.
1634 *
1635 * Note that in a regular BSS, multicast frames are sent by the
1636 * AP only, associated stations unicast the frame to the AP first
1637 * which then multicasts it on their behalf.
1638 *
1639 * There is also a slight problem in IBSS mode: GTKs are negotiated
1640 * with each station, that is something we don't currently handle.
1641 * The spec seems to expect that one negotiates the same key with
1642 * every station but there's no such requirement; VLANs could be
1643 * possible.
1644 */
1645
86c228a7
JA		 1646 /* start without a key */
1647 rx->key = NULL;
2475b1cc 1648 fc = hdr->frame_control;
86c228a7 1649
2475b1cc
MS		 1650 if (rx->sta) {
1651 int keyid = rx->sta->ptk_idx;
86c228a7 1652
2475b1cc
MS		 1653 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1654 cs = rx->sta->cipher_scheme;
2c61cf9c 1655 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
2475b1cc
MS		 1656 if (unlikely(keyid < 0))
1657 return RX_DROP_UNUSABLE;
1658 }
1659 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1660 }
86c228a7
JA		 1661
1662 if (!ieee80211_has_protected(fc))
1663 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1664
1665 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1666 rx->key = sta_ptk;
1667 if ((status->flag & RX_FLAG_DECRYPTED) &&
1668 (status->flag & RX_FLAG_IV_STRIPPED))
1669 return RX_CONTINUE;
1670 /* Skip decryption if the frame is not protected. */
1671 if (!ieee80211_has_protected(fc))
1672 return RX_CONTINUE;
1673 } else if (mmie_keyidx >= 0) {
1674 /* Broadcast/multicast robust management frame / BIP */
1675 if ((status->flag & RX_FLAG_DECRYPTED) &&
1676 (status->flag & RX_FLAG_IV_STRIPPED))
1677 return RX_CONTINUE;
1678
1679 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1680 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1681 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
46f6b060
MH		 1682 if (rx->sta) {
1683 if (ieee80211_is_group_privacy_action(skb) &&
1684 test_sta_flag(rx->sta, WLAN_STA_MFP))
1685 return RX_DROP_MONITOR;
1686
86c228a7 1687 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
46f6b060 1688 }
86c228a7
JA		 1689 if (!rx->key)
1690 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1691 } else if (!ieee80211_has_protected(fc)) {
1692 /*
1693 * The frame was not protected, so skip decryption. However, we
1694 * need to set rx->key if there is a key that could have been
1695 * used so that the frame may be dropped if encryption would
1696 * have been expected.
1697 */
1698 struct ieee80211_key *key = NULL;
1699 struct ieee80211_sub_if_data *sdata = rx->sdata;
1700 int i;
1701
1702 if (ieee80211_is_mgmt(fc) &&
1703 is_multicast_ether_addr(hdr->addr1) &&
1704 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1705 rx->key = key;
1706 else {
1707 if (rx->sta) {
1708 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1709 key = rcu_dereference(rx->sta->gtk[i]);
1710 if (key)
1711 break;
1712 }
1713 }
1714 if (!key) {
1715 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1716 key = rcu_dereference(sdata->keys[i]);
1717 if (key)
1718 break;
1719 }
1720 }
1721 if (key)
1722 rx->key = key;
1723 }
1724 return RX_CONTINUE;
1725 } else {
1726 u8 keyid;
2475b1cc 1727
86c228a7
JA		 1728 /*
1729 * The device doesn't give us the IV so we won't be
1730 * able to look up the key. That's ok though, we
1731 * don't need to decrypt the frame, we just won't
1732 * be able to keep statistics accurate.
1733 * Except for key threshold notifications, should
1734 * we somehow allow the driver to tell us which key
1735 * the hardware used if this flag is set?
1736 */
1737 if ((status->flag & RX_FLAG_DECRYPTED) &&
1738 (status->flag & RX_FLAG_IV_STRIPPED))
1739 return RX_CONTINUE;
1740
1741 hdrlen = ieee80211_hdrlen(fc);
1742
2475b1cc 1743 if (cs) {
2c61cf9c 1744 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
86c228a7 1745
2475b1cc
MS		 1746 if (unlikely(keyidx < 0))
1747 return RX_DROP_UNUSABLE;
1748 } else {
1749 if (rx->skb->len < 8 + hdrlen)
1750 return RX_DROP_UNUSABLE; /* TODO: count this? */
1751 /*
1752 * no need to call ieee80211_wep_get_keyidx,
1753 * it verifies a bunch of things we've done already
1754 */
1755 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1756 keyidx = keyid >> 6;
1757 }
86c228a7
JA		 1758
1759 /* check per-station GTK first, if multicast packet */
1760 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1761 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1762
1763 /* if not found, try default key */
1764 if (!rx->key) {
1765 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1766
1767 /*
1768 * RSNA-protected unicast frames should always be
1769 * sent with pairwise or station-to-station keys,
1770 * but for WEP we allow using a key index as well.
1771 */
1772 if (rx->key &&
1773 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1774 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1775 !is_multicast_ether_addr(hdr->addr1))
1776 rx->key = NULL;
1777 }
1778 }
1779
1780 if (rx->key) {
1781 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1782 return RX_DROP_MONITOR;
1783
86c228a7
JA		 1784 /* TODO: add threshold stuff again */
1785 } else {
1786 return RX_DROP_MONITOR;
1787 }
1788
1789 switch (rx->key->conf.cipher) {
1790 case WLAN_CIPHER_SUITE_WEP40:
1791 case WLAN_CIPHER_SUITE_WEP104:
1792 result = ieee80211_crypto_wep_decrypt(rx);
1793 break;
1794 case WLAN_CIPHER_SUITE_TKIP:
1795 result = ieee80211_crypto_tkip_decrypt(rx);
1796 break;
1797 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1798 result = ieee80211_crypto_ccmp_decrypt(
1799 rx, IEEE80211_CCMP_MIC_LEN);
1800 break;
1801 case WLAN_CIPHER_SUITE_CCMP_256:
1802 result = ieee80211_crypto_ccmp_decrypt(
1803 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1804 break;
1805 case WLAN_CIPHER_SUITE_AES_CMAC:
1806 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1807 break;
56c52da2
JM		 1808 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1809 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1810 break;
8ade538b
JM		 1811 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1812 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1813 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1814 break;
00b9cfa3
JM		 1815 case WLAN_CIPHER_SUITE_GCMP:
1816 case WLAN_CIPHER_SUITE_GCMP_256:
1817 result = ieee80211_crypto_gcmp_decrypt(rx);
1818 break;
86c228a7 1819 default:
2475b1cc 1820 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1821 }
1822
1823 /* the hdr variable is invalid after the decrypt handlers */
1824
1825 /* either the frame has been decrypted or will be dropped */
1826 status->flag |= RX_FLAG_DECRYPTED;
1827
1828 return result;
1829}
1830
571ecf67
JB		 1831static inline struct ieee80211_fragment_entry *
1832ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1833 unsigned int frag, unsigned int seq, int rx_queue,
1834 struct sk_buff **skb)
1835{
1836 struct ieee80211_fragment_entry *entry;
571ecf67 1837
571ecf67
JB		 1838 entry = &sdata->fragments[sdata->fragment_next++];
1839 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1840 sdata->fragment_next = 0;
1841
bdcbd8e0 1842 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1843 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1844
1845 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1846 *skb = NULL;
1847 entry->first_frag_time = jiffies;
1848 entry->seq = seq;
1849 entry->rx_queue = rx_queue;
1850 entry->last_frag = frag;
9acc54be 1851 entry->check_sequential_pn = false;
571ecf67
JB		 1852 entry->extra_len = 0;
1853
1854 return entry;
1855}
1856
1857static inline struct ieee80211_fragment_entry *
1858ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1859 unsigned int frag, unsigned int seq,
571ecf67
JB		 1860 int rx_queue, struct ieee80211_hdr *hdr)
1861{
1862 struct ieee80211_fragment_entry *entry;
1863 int i, idx;
1864
1865 idx = sdata->fragment_next;
1866 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1867 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1868
1869 idx--;
1870 if (idx < 0)
1871 idx = IEEE80211_FRAGMENT_MAX - 1;
1872
1873 entry = &sdata->fragments[idx];
1874 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1875 entry->rx_queue != rx_queue ||
1876 entry->last_frag + 1 != frag)
1877 continue;
1878
b73d70ad 1879 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1880
b73d70ad
HH		 1881 /*
1882 * Check ftype and addresses are equal, else check next fragment
1883 */
1884 if (((hdr->frame_control ^ f_hdr->frame_control) &
1885 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1886 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1887 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1888 continue;
1889
ab46623e 1890 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1891 __skb_queue_purge(&entry->skb_list);
1892 continue;
1893 }
1894 return entry;
1895 }
1896
1897 return NULL;
1898}
1899
49461622 1900static ieee80211_rx_result debug_noinline
5cf121c3 1901ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1902{
1903 struct ieee80211_hdr *hdr;
1904 u16 sc;
358c8d9d 1905 __le16 fc;
571ecf67
JB		 1906 unsigned int frag, seq;
1907 struct ieee80211_fragment_entry *entry;
1908 struct sk_buff *skb;
554891e6 1909 struct ieee80211_rx_status *status;
571ecf67 1910
b73d70ad 1911 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1912 fc = hdr->frame_control;
f7fbf70e
JC		 1913
1914 if (ieee80211_is_ctl(fc))
1915 return RX_CONTINUE;
1916
571ecf67
JB		 1917 sc = le16_to_cpu(hdr->seq_ctrl);
1918 frag = sc & IEEE80211_SCTL_FRAG;
1919
b8fff407 1920 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 1921 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 1922 goto out_no_led;
571ecf67 1923 }
b8fff407 1924
d025933e
AM		 1925 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1926 goto out;
1927
571ecf67
JB		 1928 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1929
e3cf8b3f
ZY		 1930 if (skb_linearize(rx->skb))
1931 return RX_DROP_UNUSABLE;
1932
058897a4
AK		 1933 /*
1934 * skb_linearize() might change the skb->data and
1935 * previously cached variables (in this case, hdr) need to
1936 * be refreshed with the new data.
1937 */
1938 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1939 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1940
1941 if (frag == 0) {
1942 /* This is the first fragment of a new frame. */
1943 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1944 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 1945 if (rx->key &&
1946 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
9acc54be
JB		 1947 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1948 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1949 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
358c8d9d 1950 ieee80211_has_protected(fc)) {
9e26297a 1951 int queue = rx->security_idx;
9acc54be
JB		 1952
1953 /* Store CCMP/GCMP PN so that we can verify that the
1954 * next fragment has a sequential PN value.
1955 */
1956 entry->check_sequential_pn = true;
571ecf67 1957 memcpy(entry->last_pn,
9190252c 1958 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1959 IEEE80211_CCMP_PN_LEN);
9acc54be
JB		 1960 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1961 u.ccmp.rx_pn) !=
1962 offsetof(struct ieee80211_key,
1963 u.gcmp.rx_pn));
1964 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1965 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1966 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1967 IEEE80211_GCMP_PN_LEN);
571ecf67 1968 }
9ae54c84 1969 return RX_QUEUED;
571ecf67
JB		 1970 }
1971
1972 /* This is a fragment for a frame that should already be pending in
1973 * fragment cache. Add this fragment to the end of the pending entry.
1974 */
9e26297a
JB		 1975 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1976 rx->seqno_idx, hdr);
571ecf67
JB		 1977 if (!entry) {
1978 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1979 return RX_DROP_MONITOR;
571ecf67
JB		 1980 }
1981
9acc54be
JB		 1982 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1983 * MPDU PN values are not incrementing in steps of 1."
1984 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1985 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1986 */
1987 if (entry->check_sequential_pn) {
571ecf67 1988 int i;
4325f6ca 1989 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1990 int queue;
9acc54be 1991
2b2ba0db
JM		 1992 if (!rx->key ||
1993 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
9acc54be
JB		 1994 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1995 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1996 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
e4c26add 1997 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1998 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1999 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 2000 pn[i]++;
2001 if (pn[i])
2002 break;
2003 }
9e26297a 2004 queue = rx->security_idx;
9190252c 2005 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 2006 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 2007 return RX_DROP_UNUSABLE;
4325f6ca 2008 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 2009 }
2010
358c8d9d 2011 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 2012 __skb_queue_tail(&entry->skb_list, rx->skb);
2013 entry->last_frag = frag;
2014 entry->extra_len += rx->skb->len;
358c8d9d 2015 if (ieee80211_has_morefrags(fc)) {
571ecf67 2016 rx->skb = NULL;
9ae54c84 2017 return RX_QUEUED;
571ecf67
JB		 2018 }
2019
2020 rx->skb = __skb_dequeue(&entry->skb_list);
2021 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 2022 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 2023 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2024 GFP_ATOMIC))) {
2025 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2026 __skb_queue_purge(&entry->skb_list);
e4c26add 2027 return RX_DROP_UNUSABLE;
571ecf67
JB		 2028 }
2029 }
2030 while ((skb = __skb_dequeue(&entry->skb_list))) {
2031 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2032 dev_kfree_skb(skb);
2033 }
2034
2035 /* Complete frame has been reassembled - process it now */
554891e6 2036 status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 2037
2038 out:
d025933e
AM		 2039 ieee80211_led_rx(rx->local);
2040 out_no_led:
571ecf67 2041 if (rx->sta)
e5a9f8d0 2042 rx->sta->rx_stats.packets++;
9ae54c84 2043 return RX_CONTINUE;
571ecf67
JB		 2044}
2045
1df332e8 2046static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 2047{
1df332e8 2048 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 2049 return -EACCES;
571ecf67 2050
76ee65bf 2051 return 0;
571ecf67
JB		 2052}
2053
1df332e8 2054static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 2055{
eb9fb5b8
JB		 2056 struct sk_buff *skb = rx->skb;
2057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2058
3017b80b 2059 /*
7848ba7d
JB		 2060 * Pass through unencrypted frames if the hardware has
2061 * decrypted them already.
3017b80b 2062 */
eb9fb5b8 2063 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 2064 return 0;
571ecf67
JB		 2065
2066 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 2067 if (unlikely(!ieee80211_has_protected(fc) &&
2068 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 2069 ieee80211_is_data(fc) && rx->key))
76ee65bf 2070 return -EACCES;
bef5d1c7
JB		 2071
2072 return 0;
2073}
2074
1df332e8 2075static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 2076{
2077 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 2078 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 2079 __le16 fc = hdr->frame_control;
bef5d1c7 2080
e3efca0a
JM		 2081 /*
2082 * Pass through unencrypted frames if the hardware has
2083 * decrypted them already.
2084 */
2085 if (status->flag & RX_FLAG_DECRYPTED)
2086 return 0;
bef5d1c7 2087
c2c98fde 2088 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 2089 if (unlikely(!ieee80211_has_protected(fc) &&
2090 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2091 rx->key)) {
6ff57cf8
JB		 2092 if (ieee80211_is_deauth(fc) ||
2093 ieee80211_is_disassoc(fc))
2094 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2095 rx->skb->data,
2096 rx->skb->len);
f2ca3ea4 2097 return -EACCES;
cf4e594e 2098 }
f2ca3ea4 2099 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2100 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2101 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2102 if (ieee80211_is_deauth(fc) ||
2103 ieee80211_is_disassoc(fc))
2104 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2105 rx->skb->data,
2106 rx->skb->len);
f2ca3ea4 2107 return -EACCES;
cf4e594e 2108 }
f2ca3ea4
JM		 2109 /*
2110 * When using MFP, Action frames are not allowed prior to
2111 * having configured keys.
2112 */
2113 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2114 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2115 return -EACCES;
2116 }
b3fc9c6c 2117
76ee65bf 2118 return 0;
571ecf67
JB		 2119}
2120
76ee65bf 2121static int
4114fa21 2122__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2123{
eb9fb5b8 2124 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2125 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2126 bool check_port_control = false;
2127 struct ethhdr *ehdr;
2128 int ret;
f14543ee 2129
4114fa21 2130 *port_control = false;
9bc383de
JB		 2131 if (ieee80211_has_a4(hdr->frame_control) &&
2132 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2133 return -1;
9bc383de 2134
fbb327c5
FF		 2135 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2136 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2137
2138 if (!sdata->u.mgd.use_4addr)
2139 return -1;
2140 else
2141 check_port_control = true;
2142 }
2143
9bc383de 2144 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2145 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2146 return -1;
571ecf67 2147
fbb327c5 2148 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2149 if (ret < 0)
fbb327c5
FF		 2150 return ret;
2151
2152 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2153 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2154 *port_control = true;
2155 else if (check_port_control)
fbb327c5
FF		 2156 return -1;
2157
2158 return 0;
76ee65bf 2159}
571ecf67 2160
ce3edf6d
JB		 2161/*
2162 * requires that rx->skb is a frame with ethernet header
2163 */
358c8d9d 2164static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2165{
c97c23e3 2166 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2167 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2168 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2169
2170 /*
2171 * Allow EAPOL frames to us/the PAE group address regardless
2172 * of whether the frame was encrypted or not.
2173 */
a621fa4d 2174 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2175 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2176 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2177 return true;
2178
2179 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2180 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2181 return false;
2182
2183 return true;
2184}
2185
2186/*
2187 * requires that rx->skb is a frame with ethernet header
2188 */
76ee65bf 2189static void
5cf121c3 2190ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2191{
eb9fb5b8
JB		 2192 struct ieee80211_sub_if_data *sdata = rx->sdata;
2193 struct net_device *dev = sdata->dev;
76ee65bf 2194 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2195 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2196 struct sta_info *dsta;
571ecf67 2197
76ee65bf
RR		 2198 skb = rx->skb;
2199 xmit_skb = NULL;
571ecf67 2200
5a490510
JB		 2201 ieee80211_rx_stats(dev, skb->len);
2202
de8f18d3
JB		 2203 if (rx->sta) {
2204 /* The seqno index has the same property as needed
2205 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2206 * for non-QoS-data frames. Here we know it's a data
2207 * frame, so count MSDUs.
2208 */
0f9c5a61 2209 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
de8f18d3 2210 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
0f9c5a61 2211 u64_stats_update_end(&rx->sta->rx_stats.syncp);
de8f18d3
JB		 2212 }
2213
05c914fe
JB		 2214 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2215 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2216 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2217 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2218 if (is_multicast_ether_addr(ehdr->h_dest)) {
2219 /*
2220 * send multicast frames both to higher layers in
2221 * local net stack and back to the wireless medium
2222 */
76ee65bf 2223 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2224 if (!xmit_skb)
bdcbd8e0 2225 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2226 dev->name);
571ecf67 2227 } else {
abe60632
JB		 2228 dsta = sta_info_get(sdata, skb->data);
2229 if (dsta) {
ce3edf6d
JB		 2230 /*
2231 * The destination station is associated to
2232 * this AP (in this VLAN), so send the frame
2233 * directly to it and do not pass it to local
2234 * net stack.
571ecf67 2235 */
76ee65bf 2236 xmit_skb = skb;
571ecf67
JB		 2237 skb = NULL;
2238 }
571ecf67
JB		 2239 }
2240 }
2241
59d9cb07 2242#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2243 if (skb) {
2244 /* 'align' will only take the values 0 or 2 here since all
2245 * frames are required to be aligned to 2-byte boundaries
2246 * when being passed to mac80211; the code here works just
2247 * as well if that isn't true, but mac80211 assumes it can
2248 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2249 */
9e890a1f
JB		 2250 int align;
2251
2252 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2253 if (align) {
2254 if (WARN_ON(skb_headroom(skb) < 3)) {
2255 dev_kfree_skb(skb);
2256 skb = NULL;
2257 } else {
2258 u8 *data = skb->data;
8ce0b589
ZY		 2259 size_t len = skb_headlen(skb);
2260 skb->data -= align;
2261 memmove(skb->data, data, len);
2262 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2263 }
2264 }
9e890a1f 2265 }
d1c3a37c
JB		 2266#endif
2267
9e890a1f
JB		 2268 if (skb) {
2269 /* deliver to local stack */
2270 skb->protocol = eth_type_trans(skb, dev);
2271 memset(skb->cb, 0, sizeof(skb->cb));
af9f9b22
JB		 2272 if (rx->napi)
2273 napi_gro_receive(rx->napi, skb);
06d181a8
JB		 2274 else
2275 netif_receive_skb(skb);
571ecf67
JB		 2276 }
2277
76ee65bf 2278 if (xmit_skb) {
aef6c928
HS		 2279 /*
2280 * Send to wireless media and increase priority by 256 to
2281 * keep the received priority instead of reclassifying
2282 * the frame (see cfg80211_classify8021d).
2283 */
2284 xmit_skb->priority += 256;
f831e909 2285 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2286 skb_reset_network_header(xmit_skb);
2287 skb_reset_mac_header(xmit_skb);
76ee65bf 2288 dev_queue_xmit(xmit_skb);
571ecf67 2289 }
76ee65bf
RR		 2290}
2291
49461622 2292static ieee80211_rx_result debug_noinline
5cf121c3 2293ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2294{
eb9fb5b8 2295 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2296 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2298 __le16 fc = hdr->frame_control;
eaf85ca7 2299 struct sk_buff_head frame_list;
554891e6 2300 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
7f6990c8 2301 struct ethhdr ethhdr;
fd4c7f2f 2302
358c8d9d 2303 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2304 return RX_CONTINUE;
fd4c7f2f 2305
358c8d9d 2306 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2307 return RX_DROP_MONITOR;
fd4c7f2f 2308
554891e6 2309 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2310 return RX_CONTINUE;
fd4c7f2f 2311
ea720935
JB		 2312 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2313 switch (rx->sdata->vif.type) {
2314 case NL80211_IFTYPE_AP_VLAN:
2315 if (!rx->sdata->u.vlan.sta)
2316 return RX_DROP_UNUSABLE;
2317 break;
2318 case NL80211_IFTYPE_STATION:
2319 if (!rx->sdata->u.mgd.use_4addr)
2320 return RX_DROP_UNUSABLE;
2321 break;
2322 default:
2323 return RX_DROP_UNUSABLE;
2324 }
2325 }
fd4c7f2f 2326
ea720935 2327 if (is_multicast_ether_addr(hdr->addr1))
e4c26add 2328 return RX_DROP_UNUSABLE;
fd4c7f2f 2329
eaf85ca7
ZY		 2330 skb->dev = dev;
2331 __skb_queue_head_init(&frame_list);
fd4c7f2f 2332
7f6990c8
JB		 2333 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2334 rx->sdata->vif.addr,
2335 rx->sdata->vif.type))
2336 return RX_DROP_UNUSABLE;
2337
eaf85ca7
ZY		 2338 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2339 rx->sdata->vif.type,
8b935ee2
JB		 2340 rx->local->hw.extra_tx_headroom,
2341 NULL, NULL);
fd4c7f2f 2342
eaf85ca7
ZY		 2343 while (!skb_queue_empty(&frame_list)) {
2344 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2345
358c8d9d 2346 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2347 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2348 continue;
2349 }
fd4c7f2f
RR		 2350
2351 ieee80211_deliver_skb(rx);
2352 }
2353
9ae54c84 2354 return RX_QUEUED;
fd4c7f2f
RR		 2355}
2356
bf94e17b 2357#ifdef CONFIG_MAC80211_MESH
b0dee578 2358static ieee80211_rx_result
e32f85f7
LCC		 2359ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2360{
30789eb6
TP		 2361 struct ieee80211_hdr *fwd_hdr, *hdr;
2362 struct ieee80211_tx_info *info;
e32f85f7 2363 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2364 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2365 struct ieee80211_local *local = rx->local;
eb9fb5b8 2366 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2367 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
cf440128 2368 u16 ac, q, hdrlen;
e32f85f7
LCC		 2369
2370 hdr = (struct ieee80211_hdr *) skb->data;
2371 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2372
2373 /* make sure fixed part of mesh header is there, also checks skb len */
2374 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2375 return RX_DROP_MONITOR;
2376
2377 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2378
2379 /* make sure full mesh header is there, also checks skb len */
2380 if (!pskb_may_pull(rx->skb,
2381 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2382 return RX_DROP_MONITOR;
2383
2384 /* reload pointers */
2385 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2386 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2387
d0c22119
BC		 2388 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2389 return RX_DROP_MONITOR;
2390
2157fdd6
TP		 2391 /* frame is in RMC, don't forward */
2392 if (ieee80211_is_data(hdr->frame_control) &&
2393 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2394 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2395 return RX_DROP_MONITOR;
2396
5c90067c 2397 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2398 return RX_CONTINUE;
2399
2400 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2401 return RX_DROP_MONITOR;
2402
43b7b314 2403 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2404 struct mesh_path *mppath;
43b7b314
JC		 2405 char *proxied_addr;
2406 char *mpp_addr;
2407
2408 if (is_multicast_ether_addr(hdr->addr1)) {
2409 mpp_addr = hdr->addr3;
2410 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2411 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2412 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2413 mpp_addr = hdr->addr4;
2414 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2415 } else {
2416 return RX_DROP_MONITOR;
43b7b314 2417 }
79617dee 2418
79617dee 2419 rcu_read_lock();
bf7cd94d 2420 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2421 if (!mppath) {
bf7cd94d 2422 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2423 } else {
2424 spin_lock_bh(&mppath->state_lock);
b203ca39 2425 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2426 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
ab1c7906 2427 mppath->exp_time = jiffies;
79617dee
Y		 2428 spin_unlock_bh(&mppath->state_lock);
2429 }
2430 rcu_read_unlock();
2431 }
2432
3c5772a5
JC		 2433 /* Frame has reached destination. Don't forward */
2434 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2435 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2436 return RX_CONTINUE;
2437
cf440128
MK		 2438 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2439 q = sdata->vif.hw_queue[ac];
d3c1597b 2440 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2441 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2442 return RX_DROP_MONITOR;
2443 }
2444 skb_set_queue_mapping(skb, q);
e32f85f7 2445
30789eb6
TP		 2446 if (!--mesh_hdr->ttl) {
2447 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2448 goto out;
30789eb6
TP		 2449 }
2450
d665508b
CYY		 2451 if (!ifmsh->mshcfg.dot11MeshForwarding)
2452 goto out;
2453
30789eb6
TP		 2454 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2455 if (!fwd_skb) {
bdcbd8e0 2456 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2457 sdata->name);
30789eb6
TP		 2458 goto out;
2459 }
2460
2461 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2462 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2463 info = IEEE80211_SKB_CB(fwd_skb);
2464 memset(info, 0, sizeof(*info));
2465 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2466 info->control.vif = &rx->sdata->vif;
2467 info->control.jiffies = jiffies;
2468 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2469 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2470 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2471 /* update power mode indication when forwarding */
2472 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2473 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2474 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2475 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2476 } else {
2477 /* unable to resolve next hop */
bf7cd94d 2478 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2479 fwd_hdr->addr3, 0,
2480 WLAN_REASON_MESH_PATH_NOFORWARD,
2481 fwd_hdr->addr2);
30789eb6 2482 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2483 kfree_skb(fwd_skb);
30789eb6 2484 return RX_DROP_MONITOR;
e32f85f7
LCC		 2485 }
2486
30789eb6
TP		 2487 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2488 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2489 out:
df140465 2490 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2491 return RX_CONTINUE;
df140465 2492 return RX_DROP_MONITOR;
e32f85f7 2493}
bf94e17b 2494#endif
e32f85f7 2495
49461622 2496static ieee80211_rx_result debug_noinline
5cf121c3 2497ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2498{
eb9fb5b8 2499 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2500 struct ieee80211_local *local = rx->local;
eb9fb5b8 2501 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2502 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2503 __le16 fc = hdr->frame_control;
4114fa21 2504 bool port_control;
ce3edf6d 2505 int err;
76ee65bf 2506
358c8d9d 2507 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2508 return RX_CONTINUE;
76ee65bf 2509
358c8d9d 2510 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2511 return RX_DROP_MONITOR;
76ee65bf 2512
f14543ee 2513 /*
e7f4a940
JB		 2514 * Send unexpected-4addr-frame event to hostapd. For older versions,
2515 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2516 */
2517 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2518 sdata->vif.type == NL80211_IFTYPE_AP) {
2519 if (rx->sta &&
2520 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2521 cfg80211_rx_unexpected_4addr_frame(
2522 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2523 return RX_DROP_MONITOR;
e7f4a940 2524 }
f14543ee 2525
4114fa21 2526 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2527 if (unlikely(err))
e4c26add 2528 return RX_DROP_UNUSABLE;
76ee65bf 2529
358c8d9d 2530 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2531 return RX_DROP_MONITOR;
ce3edf6d 2532
8a4d32f3
AN		 2533 /* directly handle TDLS channel switch requests/responses */
2534 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2535 cpu_to_be16(ETH_P_TDLS))) {
2536 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2537
2538 if (pskb_may_pull(rx->skb,
2539 offsetof(struct ieee80211_tdls_data, u)) &&
2540 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2541 tf->category == WLAN_CATEGORY_TDLS &&
2542 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2543 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2544 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2545 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2546 if (rx->sta)
e5a9f8d0 2547 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2548
2549 return RX_QUEUED;
2550 }
2551 }
2552
4114fa21
FF		 2553 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2554 unlikely(port_control) && sdata->bss) {
2555 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2556 u.ap);
2557 dev = sdata->dev;
2558 rx->sdata = sdata;
2559 }
2560
76ee65bf
RR		 2561 rx->skb->dev = dev;
2562
602fae42
JB		 2563 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2564 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2565 !is_multicast_ether_addr(
2566 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2567 (!local->scanning &&
602fae42
JB		 2568 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2569 mod_timer(&local->dynamic_ps_timer, jiffies +
2570 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
e15276a4 2571
76ee65bf 2572 ieee80211_deliver_skb(rx);
571ecf67 2573
9ae54c84 2574 return RX_QUEUED;
571ecf67
JB		 2575}
2576
49461622 2577static ieee80211_rx_result debug_noinline
f9e124fb 2578ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2579{
71364716 2580 struct sk_buff *skb = rx->skb;
a7767f95 2581 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2582 struct tid_ampdu_rx *tid_agg_rx;
2583 u16 start_seq_num;
2584 u16 tid;
2585
a7767f95 2586 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2587 return RX_CONTINUE;
71364716 2588
a7767f95 2589 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2590 struct {
2591 __le16 control, start_seq_num;
2592 } __packed bar_data;
6382246e
EG		 2593 struct ieee80211_event event = {
2594 .type = BAR_RX_EVENT,
2595 };
8ae5977f 2596
71364716 2597 if (!rx->sta)
a02ae758 2598 return RX_DROP_MONITOR;
8ae5977f
JB		 2599
2600 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2601 &bar_data, sizeof(bar_data)))
2602 return RX_DROP_MONITOR;
2603
8ae5977f 2604 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d 2605
53f24974
JB		 2606 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2607 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2608 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2609 WLAN_BACK_RECIPIENT,
2610 WLAN_REASON_QSTA_REQUIRE_SETUP);
2611
a87f736d
JB		 2612 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2613 if (!tid_agg_rx)
a02ae758 2614 return RX_DROP_MONITOR;
71364716 2615
8ae5977f 2616 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2617 event.u.ba.tid = tid;
2618 event.u.ba.ssn = start_seq_num;
2619 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2620
2621 /* reset session timer */
20ad19d0
JB		 2622 if (tid_agg_rx->timeout)
2623 mod_timer(&tid_agg_rx->session_timer,
2624 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2625
dd318575 2626 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2627 /* release stored frames up to start of BAR */
d3b2fb53 2628 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2629 start_seq_num, frames);
dd318575
JB		 2630 spin_unlock(&tid_agg_rx->reorder_lock);
2631
6382246e
EG		 2632 drv_event_callback(rx->local, rx->sdata, &event);
2633
a02ae758
JB		 2634 kfree_skb(skb);
2635 return RX_QUEUED;
71364716
RR		 2636 }
2637
08daecae
JB		 2638 /*
2639 * After this point, we only want management frames,
2640 * so we can drop all remaining control frames to
2641 * cooked monitor interfaces.
2642 */
2643 return RX_DROP_MONITOR;
71364716
RR		 2644}
2645
f4f727a6
JM		 2646static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2647 struct ieee80211_mgmt *mgmt,
2648 size_t len)
fea14732
JM		 2649{
2650 struct ieee80211_local *local = sdata->local;
2651 struct sk_buff *skb;
2652 struct ieee80211_mgmt *resp;
2653
b203ca39 2654 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2655 /* Not to own unicast address */
2656 return;
2657 }
2658
b203ca39
JP		 2659 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2660 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2661 /* Not from the current AP or not associated yet. */
fea14732
JM		 2662 return;
2663 }
2664
2665 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2666 /* Too short SA Query request frame */
2667 return;
2668 }
2669
2670 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2671 if (skb == NULL)
2672 return;
2673
2674 skb_reserve(skb, local->hw.extra_tx_headroom);
2675 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2676 memset(resp, 0, 24);
2677 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2678 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2679 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2680 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2681 IEEE80211_STYPE_ACTION);
2682 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2683 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2684 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2685 memcpy(resp->u.action.u.sa_query.trans_id,
2686 mgmt->u.action.u.sa_query.trans_id,
2687 WLAN_SA_QUERY_TR_ID_LEN);
2688
62ae67be 2689 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2690}
2691
2e161f78
JB		 2692static ieee80211_rx_result debug_noinline
2693ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2694{
2695 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2696 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2697
2698 /*
2699 * From here on, look only at management frames.
2700 * Data and control frames are already handled,
2701 * and unknown (reserved) frames are useless.
2702 */
2703 if (rx->skb->len < 24)
2704 return RX_DROP_MONITOR;
2705
2706 if (!ieee80211_is_mgmt(mgmt->frame_control))
2707 return RX_DROP_MONITOR;
2708
ee971924
JB		 2709 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2710 ieee80211_is_beacon(mgmt->frame_control) &&
2711 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2712 int sig = 0;
2713
30686bf7 2714 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2715 sig = status->signal;
2716
ee971924
JB		 2717 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2718 rx->skb->data, rx->skb->len,
37c73b5f 2719 status->freq, sig);
ee971924
JB		 2720 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2721 }
2722
2e161f78
JB		 2723 if (ieee80211_drop_unencrypted_mgmt(rx))
2724 return RX_DROP_UNUSABLE;
2725
2726 return RX_CONTINUE;
2727}
2728
de1ede7a
JB		 2729static ieee80211_rx_result debug_noinline
2730ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2731{
2732 struct ieee80211_local *local = rx->local;
eb9fb5b8 2733 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2734 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2735 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2736 int len = rx->skb->len;
2737
2738 if (!ieee80211_is_action(mgmt->frame_control))
2739 return RX_CONTINUE;
2740
026331c4
JM		 2741 /* drop too small frames */
2742 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2743 return RX_DROP_UNUSABLE;
de1ede7a 2744
815b8092 2745 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2746 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2747 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2748 return RX_DROP_UNUSABLE;
de1ede7a 2749
de1ede7a 2750 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2751 case WLAN_CATEGORY_HT:
2752 /* reject HT action frames from stations not supporting HT */
2753 if (!rx->sta->sta.ht_cap.ht_supported)
2754 goto invalid;
2755
2756 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2757 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2758 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2759 sdata->vif.type != NL80211_IFTYPE_AP &&
2760 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2761 break;
2762
ec61cd63 2763 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2764 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2765 goto invalid;
2766
2767 switch (mgmt->u.action.u.ht_smps.action) {
2768 case WLAN_HT_ACTION_SMPS: {
2769 struct ieee80211_supported_band *sband;
af0ed69b 2770 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2771
2772 /* convert to HT capability */
2773 switch (mgmt->u.action.u.ht_smps.smps_control) {
2774 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2775 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2776 break;
2777 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2778 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2779 break;
2780 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2781 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2782 break;
2783 default:
2784 goto invalid;
2785 }
1d8d3dec
JB		 2786
2787 /* if no change do nothing */
af0ed69b 2788 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2789 goto handled;
af0ed69b 2790 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2791
2792 sband = rx->local->hw.wiphy->bands[status->band];
2793
64f68e5d
JB		 2794 rate_control_rate_update(local, sband, rx->sta,
2795 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2796 goto handled;
2797 }
ec61cd63
JB		 2798 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2799 struct ieee80211_supported_band *sband;
2800 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2801 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2802
2803 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2804 if (!(rx->sta->sta.ht_cap.cap &
2805 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2806 goto handled;
2807
e1a0c6b3 2808 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2809 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2810 else
1c45c5ce
EP		 2811 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2812
2813 /* set cur_max_bandwidth and recalc sta bw */
2814 rx->sta->cur_max_bandwidth = max_bw;
2815 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2816
e1a0c6b3 2817 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2818 goto handled;
2819
1c45c5ce 2820 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2821 sband = rx->local->hw.wiphy->bands[status->band];
2822
2823 rate_control_rate_update(local, sband, rx->sta,
2824 IEEE80211_RC_BW_CHANGED);
2825 goto handled;
2826 }
1d8d3dec
JB		 2827 default:
2828 goto invalid;
2829 }
2830
0af83d3d 2831 break;
1b3a2e49
JB		 2832 case WLAN_CATEGORY_PUBLIC:
2833 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2834 goto invalid;
2835 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2836 break;
2837 if (!rx->sta)
2838 break;
2839 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2840 break;
2841 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2842 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2843 break;
2844 if (len < offsetof(struct ieee80211_mgmt,
2845 u.action.u.ext_chan_switch.variable))
2846 goto invalid;
2847 goto queue;
0af83d3d
JB		 2848 case WLAN_CATEGORY_VHT:
2849 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2850 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2851 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2852 sdata->vif.type != NL80211_IFTYPE_AP &&
2853 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2854 break;
2855
2856 /* verify action code is present */
2857 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2858 goto invalid;
2859
2860 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2861 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2862 u8 opmode;
2863
2864 /* verify opmode is present */
2865 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2866 goto invalid;
2867
2868 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2869
2870 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
cf1e05c6 2871 opmode, status->band);
0af83d3d
JB		 2872 goto handled;
2873 }
23a1f8d4
SS		 2874 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2875 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2876 goto invalid;
2877 goto queue;
2878 }
0af83d3d
JB		 2879 default:
2880 break;
2881 }
1d8d3dec 2882 break;
de1ede7a 2883 case WLAN_CATEGORY_BACK:
8abd3f9b 2884 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2885 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2886 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2887 sdata->vif.type != NL80211_IFTYPE_AP &&
2888 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2889 break;
8abd3f9b 2890
026331c4
JM		 2891 /* verify action_code is present */
2892 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2893 break;
2894
de1ede7a
JB		 2895 switch (mgmt->u.action.u.addba_req.action_code) {
2896 case WLAN_ACTION_ADDBA_REQ:
2897 if (len < (IEEE80211_MIN_ACTION_SIZE +
2898 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2899 goto invalid;
2900 break;
de1ede7a
JB		 2901 case WLAN_ACTION_ADDBA_RESP:
2902 if (len < (IEEE80211_MIN_ACTION_SIZE +
2903 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2904 goto invalid;
2905 break;
de1ede7a
JB		 2906 case WLAN_ACTION_DELBA:
2907 if (len < (IEEE80211_MIN_ACTION_SIZE +
2908 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2909 goto invalid;
2910 break;
2911 default:
2912 goto invalid;
de1ede7a 2913 }
bed7ee6e 2914
8b58ff83 2915 goto queue;
39192c0b 2916 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2917 /* verify action_code is present */
2918 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2919 break;
2920
39192c0b
JB		 2921 switch (mgmt->u.action.u.measurement.action_code) {
2922 case WLAN_ACTION_SPCT_MSR_REQ:
57fbcce3 2923 if (status->band != NL80211_BAND_5GHZ)
cd7760e6
SW		 2924 break;
2925
39192c0b
JB		 2926 if (len < (IEEE80211_MIN_ACTION_SIZE +
2927 sizeof(mgmt->u.action.u.measurement)))
84040805 2928 break;
cd7760e6
SW		 2929
2930 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2931 break;
2932
39192c0b 2933 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2934 goto handled;
cd7760e6
SW		 2935 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2936 u8 *bssid;
2937 if (len < (IEEE80211_MIN_ACTION_SIZE +
2938 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2939 break;
cc32abd4 2940
cd7760e6 2941 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2942 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2943 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2944 break;
2945
2946 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2947 bssid = sdata->u.mgd.bssid;
2948 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2949 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2950 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2951 bssid = mgmt->sa;
cd7760e6
SW		 2952 else
2953 break;
2954
2955 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2956 break;
c481ec97 2957
8b58ff83 2958 goto queue;
cd7760e6 2959 }
39192c0b
JB		 2960 }
2961 break;
fea14732
JM		 2962 case WLAN_CATEGORY_SA_QUERY:
2963 if (len < (IEEE80211_MIN_ACTION_SIZE +
2964 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2965 break;
2966
fea14732
JM		 2967 switch (mgmt->u.action.u.sa_query.action) {
2968 case WLAN_ACTION_SA_QUERY_REQUEST:
2969 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2970 break;
fea14732 2971 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2972 goto handled;
fea14732
JM		 2973 }
2974 break;
8db09850 2975 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2976 if (len < (IEEE80211_MIN_ACTION_SIZE +
2977 sizeof(mgmt->u.action.u.self_prot.action_code)))
2978 break;
2979
8db09850
TP		 2980 switch (mgmt->u.action.u.self_prot.action_code) {
2981 case WLAN_SP_MESH_PEERING_OPEN:
2982 case WLAN_SP_MESH_PEERING_CLOSE:
2983 case WLAN_SP_MESH_PEERING_CONFIRM:
2984 if (!ieee80211_vif_is_mesh(&sdata->vif))
2985 goto invalid;
a6dad6a2 2986 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2987 /* userspace handles this frame */
2988 break;
2989 goto queue;
2990 case WLAN_SP_MGK_INFORM:
2991 case WLAN_SP_MGK_ACK:
2992 if (!ieee80211_vif_is_mesh(&sdata->vif))
2993 goto invalid;
2994 break;
2995 }
2996 break;
d3aaec8a 2997 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2998 if (len < (IEEE80211_MIN_ACTION_SIZE +
2999 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3000 break;
3001
77a121c3
JB		 3002 if (!ieee80211_vif_is_mesh(&sdata->vif))
3003 break;
25d49e4d 3004 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 3005 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 3006 break;
3007 goto queue;
84040805 3008 }
026331c4 3009
2e161f78
JB		 3010 return RX_CONTINUE;
3011
bed7ee6e 3012 invalid:
554891e6 3013 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 3014 /* will return in the next handlers */
3015 return RX_CONTINUE;
3016
3017 handled:
3018 if (rx->sta)
e5a9f8d0 3019 rx->sta->rx_stats.packets++;
2e161f78
JB		 3020 dev_kfree_skb(rx->skb);
3021 return RX_QUEUED;
3022
3023 queue:
3024 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3025 skb_queue_tail(&sdata->skb_queue, rx->skb);
3026 ieee80211_queue_work(&local->hw, &sdata->work);
3027 if (rx->sta)
e5a9f8d0 3028 rx->sta->rx_stats.packets++;
2e161f78
JB		 3029 return RX_QUEUED;
3030}
3031
3032static ieee80211_rx_result debug_noinline
3033ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3034{
554891e6 3035 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 3036 int sig = 0;
2e161f78
JB		 3037
3038 /* skip known-bad action frames and return them in the next handler */
554891e6 3039 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 3040 return RX_CONTINUE;
d7907448 3041
026331c4
JM		 3042 /*
3043 * Getting here means the kernel doesn't know how to handle
3044 * it, but maybe userspace does ... include returned frames
3045 * so userspace can register for those to know whether ones
3046 * it transmitted were processed or returned.
3047 */
026331c4 3048
30686bf7 3049 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 3050 sig = status->signal;
3051
71bbc994 3052 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 3053 rx->skb->data, rx->skb->len, 0)) {
2e161f78 3054 if (rx->sta)
e5a9f8d0 3055 rx->sta->rx_stats.packets++;
2e161f78
JB		 3056 dev_kfree_skb(rx->skb);
3057 return RX_QUEUED;
3058 }
3059
2e161f78
JB		 3060 return RX_CONTINUE;
3061}
3062
3063static ieee80211_rx_result debug_noinline
3064ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3065{
3066 struct ieee80211_local *local = rx->local;
3067 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3068 struct sk_buff *nskb;
3069 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 3070 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 3071
3072 if (!ieee80211_is_action(mgmt->frame_control))
3073 return RX_CONTINUE;
3074
3075 /*
3076 * For AP mode, hostapd is responsible for handling any action
3077 * frames that we didn't handle, including returning unknown
3078 * ones. For all other modes we will return them to the sender,
3079 * setting the 0x80 bit in the action category, as required by
4b5ebccc 3080 * 802.11-2012 9.24.4.
2e161f78
JB		 3081 * Newer versions of hostapd shall also use the management frame
3082 * registration mechanisms, but older ones still use cooked
3083 * monitor interfaces so push all frames there.
3084 */
554891e6 3085 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 3086 (sdata->vif.type == NL80211_IFTYPE_AP ||
3087 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3088 return RX_DROP_MONITOR;
026331c4 3089
4b5ebccc
JB		 3090 if (is_multicast_ether_addr(mgmt->da))
3091 return RX_DROP_MONITOR;
3092
84040805
JB		 3093 /* do not return rejected action frames */
3094 if (mgmt->u.action.category & 0x80)
3095 return RX_DROP_UNUSABLE;
3096
3097 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3098 GFP_ATOMIC);
3099 if (nskb) {
292b4df6 3100 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 3101
292b4df6
JL		 3102 nmgmt->u.action.category |= 0x80;
3103 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3104 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 3105
3106 memset(nskb->cb, 0, sizeof(nskb->cb));
3107
07e5a5f5
JB		 3108 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3109 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3110
3111 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3112 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3113 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 3114 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 3115 info->hw_queue =
3116 local->hw.offchannel_tx_hw_queue;
3117 }
3118
3119 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3120 status->band);
de1ede7a 3121 }
39192c0b
JB		 3122 dev_kfree_skb(rx->skb);
3123 return RX_QUEUED;
de1ede7a
JB		 3124}
3125
49461622 3126static ieee80211_rx_result debug_noinline
5cf121c3 3127ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3128{
eb9fb5b8 3129 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3130 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3131 __le16 stype;
571ecf67 3132
77a121c3 3133 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3134
77a121c3
JB		 3135 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3136 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3137 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3138 sdata->vif.type != NL80211_IFTYPE_STATION)
3139 return RX_DROP_MONITOR;
472dbc45 3140
77a121c3 3141 switch (stype) {
66e67e41 3142 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3143 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3144 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3145 /* process for all: mesh, mlme, ibss */
3146 break;
66e67e41
JB		 3147 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3148 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3149 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3150 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3151 if (is_multicast_ether_addr(mgmt->da) &&
3152 !is_broadcast_ether_addr(mgmt->da))
3153 return RX_DROP_MONITOR;
3154
77a121c3
JB		 3155 /* process only for station */
3156 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3157 return RX_DROP_MONITOR;
3158 break;
3159 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3160 /* process only for ibss and mesh */
3161 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3162 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3163 return RX_DROP_MONITOR;
3164 break;
3165 default:
3166 return RX_DROP_MONITOR;
3167 }
f9d540ee 3168
77a121c3 3169 /* queue up frame and kick off work to process it */
c1475ca9 3170 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3171 skb_queue_tail(&sdata->skb_queue, rx->skb);
3172 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3173 if (rx->sta)
e5a9f8d0 3174 rx->sta->rx_stats.packets++;
46900298 3175
77a121c3 3176 return RX_QUEUED;
571ecf67
JB		 3177}
3178
5f0b7de5
JB		 3179static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3180 struct ieee80211_rate *rate)
3d30d949
MW		 3181{
3182 struct ieee80211_sub_if_data *sdata;
3183 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3184 struct sk_buff *skb = rx->skb, *skb2;
3185 struct net_device *prev_dev = NULL;
eb9fb5b8 3186 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3187 int needed_headroom;
3d30d949 3188
554891e6
JB		 3189 /*
3190 * If cooked monitor has been processed already, then
3191 * don't do it again. If not, set the flag.
3192 */
3193 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3194 goto out_free_skb;
554891e6 3195 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3196
152c477a
JB		 3197 /* If there are no cooked monitor interfaces, just free the SKB */
3198 if (!local->cooked_mntrs)
3199 goto out_free_skb;
3200
1f7bba79
JB		 3201 /* vendor data is long removed here */
3202 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3203 /* room for the radiotap header based on driver features */
1f7bba79 3204 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3205
293702a3
JB		 3206 if (skb_headroom(skb) < needed_headroom &&
3207 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3208 goto out_free_skb;
3d30d949 3209
293702a3 3210 /* prepend radiotap information */
973ef21a
FF		 3211 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3212 false);
3d30d949 3213
d57a544d 3214 skb_reset_mac_header(skb);
3d30d949
MW		 3215 skb->ip_summed = CHECKSUM_UNNECESSARY;
3216 skb->pkt_type = PACKET_OTHERHOST;
3217 skb->protocol = htons(ETH_P_802_2);
3218
3219 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3220 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3221 continue;
3222
05c914fe 3223 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
d8212184 3224 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3d30d949
MW		 3225 continue;
3226
3227 if (prev_dev) {
3228 skb2 = skb_clone(skb, GFP_ATOMIC);
3229 if (skb2) {
3230 skb2->dev = prev_dev;
5548a8a1 3231 netif_receive_skb(skb2);
3d30d949
MW		 3232 }
3233 }
3234
3235 prev_dev = sdata->dev;
5a490510 3236 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3237 }
3238
3239 if (prev_dev) {
3240 skb->dev = prev_dev;
5548a8a1 3241 netif_receive_skb(skb);
554891e6
JB		 3242 return;
3243 }
3d30d949
MW		 3244
3245 out_free_skb:
3246 dev_kfree_skb(skb);
3247}
3248
aa0c8636
CL		 3249static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3250 ieee80211_rx_result res)
3251{
3252 switch (res) {
3253 case RX_DROP_MONITOR:
3254 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3255 if (rx->sta)
e5a9f8d0 3256 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3257 /* fall through */
3258 case RX_CONTINUE: {
3259 struct ieee80211_rate *rate = NULL;
3260 struct ieee80211_supported_band *sband;
3261 struct ieee80211_rx_status *status;
3262
3263 status = IEEE80211_SKB_RXCB((rx->skb));
3264
3265 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3266 if (!(status->flag & RX_FLAG_HT) &&
3267 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3268 rate = &sband->bitrates[status->rate_idx];
3269
3270 ieee80211_rx_cooked_monitor(rx, rate);
3271 break;
3272 }
3273 case RX_DROP_UNUSABLE:
3274 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3275 if (rx->sta)
e5a9f8d0 3276 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3277 dev_kfree_skb(rx->skb);
3278 break;
3279 case RX_QUEUED:
3280 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3281 break;
3282 }
3283}
571ecf67 3284
f9e124fb
CL		 3285static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3286 struct sk_buff_head *frames)
58905290 3287{
58905290 3288 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3289 struct sk_buff *skb;
8944b79f 3290
e32f85f7
LCC		 3291#define CALL_RXH(rxh) \
3292 do { \
3293 res = rxh(rx); \
3294 if (res != RX_CONTINUE) \
2569a826 3295 goto rxh_next; \
8ebaa5b0 3296 } while (0)
49461622 3297
45ceeee8
JB		 3298 /* Lock here to avoid hitting all of the data used in the RX
3299 * path (e.g. key data, station data, ...) concurrently when
3300 * a frame is released from the reorder buffer due to timeout
3301 * from the timer, potentially concurrently with RX from the
3302 * driver.
3303 */
f9e124fb 3304 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3305
f9e124fb 3306 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3307 /*
3308 * all the other fields are valid across frames
3309 * that belong to an aMPDU since they are on the
3310 * same TID from the same station
3311 */
3312 rx->skb = skb;
3313
8ebaa5b0
JB		 3314 CALL_RXH(ieee80211_rx_h_check_more_data);
3315 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3316 CALL_RXH(ieee80211_rx_h_sta_process);
3317 CALL_RXH(ieee80211_rx_h_decrypt);
3318 CALL_RXH(ieee80211_rx_h_defragment);
3319 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
2569a826 3320 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3321#ifdef CONFIG_MAC80211_MESH
aa0c8636 3322 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3323 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3324#endif
8ebaa5b0
JB		 3325 CALL_RXH(ieee80211_rx_h_amsdu);
3326 CALL_RXH(ieee80211_rx_h_data);
f9e124fb
CL		 3327
3328 /* special treatment -- needs the queue */
3329 res = ieee80211_rx_h_ctrl(rx, frames);
3330 if (res != RX_CONTINUE)
3331 goto rxh_next;
3332
8ebaa5b0
JB		 3333 CALL_RXH(ieee80211_rx_h_mgmt_check);
3334 CALL_RXH(ieee80211_rx_h_action);
3335 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3336 CALL_RXH(ieee80211_rx_h_action_return);
3337 CALL_RXH(ieee80211_rx_h_mgmt);
49461622 3338
aa0c8636
CL		 3339 rxh_next:
3340 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3341
49461622 3342#undef CALL_RXH
aa0c8636 3343 }
24a8fdad 3344
f9e124fb 3345 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3346}
3347
4406c376 3348static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3349{
f9e124fb 3350 struct sk_buff_head reorder_release;
aa0c8636
CL		 3351 ieee80211_rx_result res = RX_DROP_MONITOR;
3352
f9e124fb
CL		 3353 __skb_queue_head_init(&reorder_release);
3354
aa0c8636
CL		 3355#define CALL_RXH(rxh) \
3356 do { \
3357 res = rxh(rx); \
3358 if (res != RX_CONTINUE) \
3359 goto rxh_next; \
8ebaa5b0 3360 } while (0)
aa0c8636 3361
8ebaa5b0
JB		 3362 CALL_RXH(ieee80211_rx_h_check_dup);
3363 CALL_RXH(ieee80211_rx_h_check);
aa0c8636 3364
f9e124fb 3365 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3366
f9e124fb 3367 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3368 return;
49461622 3369
2569a826 3370 rxh_next:
aa0c8636
CL		 3371 ieee80211_rx_handlers_result(rx, res);
3372
3373#undef CALL_RXH
58905290
JB		 3374}
3375
2bff8ebf 3376/*
dd318575
JB		 3377 * This function makes calls into the RX path, therefore
3378 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3379 */
3380void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3381{
f9e124fb 3382 struct sk_buff_head frames;
554891e6
JB		 3383 struct ieee80211_rx_data rx = {
3384 .sta = sta,
3385 .sdata = sta->sdata,
3386 .local = sta->local,
9e26297a
JB		 3387 /* This is OK -- must be QoS data frame */
3388 .security_idx = tid,
3389 .seqno_idx = tid,
af9f9b22 3390 .napi = NULL, /* must be NULL to not have races */
554891e6 3391 };
2c15a0cf
CL		 3392 struct tid_ampdu_rx *tid_agg_rx;
3393
3394 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3395 if (!tid_agg_rx)
3396 return;
2bff8ebf 3397
f9e124fb
CL		 3398 __skb_queue_head_init(&frames);
3399
2c15a0cf 3400 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3401 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3402 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3403
b497de63
EG		 3404 if (!skb_queue_empty(&frames)) {
3405 struct ieee80211_event event = {
3406 .type = BA_FRAME_TIMEOUT,
3407 .u.ba.tid = tid,
3408 .u.ba.sta = &sta->sta,
3409 };
3410 drv_event_callback(rx.local, rx.sdata, &event);
3411 }
3412
f9e124fb 3413 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3414}
3415
06470f74
SS		 3416void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3417 u16 ssn, u64 filtered,
3418 u16 received_mpdus)
3419{
3420 struct sta_info *sta;
3421 struct tid_ampdu_rx *tid_agg_rx;
3422 struct sk_buff_head frames;
3423 struct ieee80211_rx_data rx = {
3424 /* This is OK -- must be QoS data frame */
3425 .security_idx = tid,
3426 .seqno_idx = tid,
3427 };
3428 int i, diff;
3429
3430 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3431 return;
3432
3433 __skb_queue_head_init(&frames);
3434
3435 sta = container_of(pubsta, struct sta_info, sta);
3436
3437 rx.sta = sta;
3438 rx.sdata = sta->sdata;
3439 rx.local = sta->local;
3440
3441 rcu_read_lock();
3442 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3443 if (!tid_agg_rx)
3444 goto out;
3445
3446 spin_lock_bh(&tid_agg_rx->reorder_lock);
3447
3448 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3449 int release;
3450
3451 /* release all frames in the reorder buffer */
3452 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3453 IEEE80211_SN_MODULO;
3454 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3455 release, &frames);
3456 /* update ssn to match received ssn */
3457 tid_agg_rx->head_seq_num = ssn;
3458 } else {
3459 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3460 &frames);
3461 }
3462
3463 /* handle the case that received ssn is behind the mac ssn.
3464 * it can be tid_agg_rx->buf_size behind and still be valid */
3465 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3466 if (diff >= tid_agg_rx->buf_size) {
3467 tid_agg_rx->reorder_buf_filtered = 0;
3468 goto release;
3469 }
3470 filtered = filtered >> diff;
3471 ssn += diff;
3472
3473 /* update bitmap */
3474 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3475 int index = (ssn + i) % tid_agg_rx->buf_size;
3476
3477 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3478 if (filtered & BIT_ULL(i))
3479 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3480 }
3481
3482 /* now process also frames that the filter marking released */
3483 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3484
3485release:
3486 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3487
3488 ieee80211_rx_handlers(&rx, &frames);
3489
3490 out:
3491 rcu_read_unlock();
3492}
3493EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3494
571ecf67
JB		 3495/* main receive path */
3496
a58fbe1a 3497static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3498{
20b01f80 3499 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3500 struct sk_buff *skb = rx->skb;
a58fbe1a 3501 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3502 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3503 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3504 int multicast = is_multicast_ether_addr(hdr->addr1);
3505
51fb61e7 3506 switch (sdata->vif.type) {
05c914fe 3507 case NL80211_IFTYPE_STATION:
9bc383de 3508 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3509 return false;
a58fbe1a
JB		 3510 if (multicast)
3511 return true;
3512 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3513 case NL80211_IFTYPE_ADHOC:
23a24def 3514 if (!bssid)
3c2723f5 3515 return false;
6329b8d9
FF		 3516 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3517 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3518 return false;
a58fbe1a 3519 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3520 return true;
a58fbe1a 3521 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3522 return false;
a58fbe1a
JB		 3523 if (!multicast &&
3524 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3525 return false;
a58fbe1a 3526 if (!rx->sta) {
0fb8ca45 3527 int rate_idx;
5614618e
JB		 3528 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3529 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3530 else
eb9fb5b8 3531 rate_idx = status->rate_idx;
8bf11d8d
JB		 3532 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3533 BIT(rate_idx));
0fb8ca45 3534 }
a58fbe1a 3535 return true;
239281f8
RL		 3536 case NL80211_IFTYPE_OCB:
3537 if (!bssid)
3538 return false;
cc117298 3539 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3540 return false;
a58fbe1a 3541 if (!is_broadcast_ether_addr(bssid))
239281f8 3542 return false;
a58fbe1a
JB		 3543 if (!multicast &&
3544 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3545 return false;
a58fbe1a 3546 if (!rx->sta) {
239281f8
RL		 3547 int rate_idx;
3548 if (status->flag & RX_FLAG_HT)
3549 rate_idx = 0; /* TODO: HT rates */
3550 else
3551 rate_idx = status->rate_idx;
3552 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3553 BIT(rate_idx));
3554 }
a58fbe1a 3555 return true;
05c914fe 3556 case NL80211_IFTYPE_MESH_POINT:
a58fbe1a
JB		 3557 if (multicast)
3558 return true;
3559 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3560 case NL80211_IFTYPE_AP_VLAN:
3561 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3562 if (!bssid)
3563 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3564
3565 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3566 /*
3567 * Accept public action frames even when the
3568 * BSSID doesn't match, this is used for P2P
3569 * and location updates. Note that mac80211
3570 * itself never looks at these frames.
3571 */
2b9ccd4e
JB		 3572 if (!multicast &&
3573 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3574 return false;
d48b2968 3575 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3576 return true;
5c90067c 3577 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3578 }
3579
3580 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3581 /* ignore data frames to TDLS-peers */
3582 if (ieee80211_is_data(hdr->frame_control))
3583 return false;
3584 /* ignore action frames to TDLS-peers */
3585 if (ieee80211_is_action(hdr->frame_control) &&
1ec7bae8 3586 !is_broadcast_ether_addr(bssid) &&
db8e1732
AN		 3587 !ether_addr_equal(bssid, hdr->addr1))
3588 return false;
23a24def 3589 }
a58fbe1a 3590 return true;
05c914fe 3591 case NL80211_IFTYPE_WDS:
a7767f95 3592 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3593 return false;
a58fbe1a 3594 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3595 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3596 return ieee80211_is_public_action(hdr, skb->len) ||
3597 ieee80211_is_probe_req(hdr->frame_control) ||
3598 ieee80211_is_probe_resp(hdr->frame_control) ||
3599 ieee80211_is_beacon(hdr->frame_control);
cb3b7d87
AB		 3600 case NL80211_IFTYPE_NAN:
3601 /* Currently no frames on NAN interface are allowed */
3602 return false;
2ca27bcf 3603 default:
fb1c1cd6 3604 break;
23a24def
JB		 3605 }
3606
a58fbe1a
JB		 3607 WARN_ON_ONCE(1);
3608 return false;
23a24def
JB		 3609}
3610
49ddf8e6
JB		 3611void ieee80211_check_fast_rx(struct sta_info *sta)
3612{
3613 struct ieee80211_sub_if_data *sdata = sta->sdata;
3614 struct ieee80211_local *local = sdata->local;
3615 struct ieee80211_key *key;
3616 struct ieee80211_fast_rx fastrx = {
3617 .dev = sdata->dev,
3618 .vif_type = sdata->vif.type,
3619 .control_port_protocol = sdata->control_port_protocol,
3620 }, *old, *new = NULL;
3621 bool assign = false;
3622
3623 /* use sparse to check that we don't return without updating */
3624 __acquire(check_fast_rx);
3625
3626 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3627 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3628 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3629 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3630
c9c5962b
JB		 3631 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3632
49ddf8e6
JB		 3633 /* fast-rx doesn't do reordering */
3634 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3635 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3636 goto clear;
3637
3638 switch (sdata->vif.type) {
3639 case NL80211_IFTYPE_STATION:
3640 /* 4-addr is harder to deal with, later maybe */
3641 if (sdata->u.mgd.use_4addr)
3642 goto clear;
3643 /* software powersave is a huge mess, avoid all of it */
3644 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3645 goto clear;
3646 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3647 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3648 goto clear;
3649 if (sta->sta.tdls) {
3650 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3651 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3652 fastrx.expected_ds_bits = 0;
3653 } else {
3654 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3655 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3656 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3657 fastrx.expected_ds_bits =
3658 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3659 }
3660 break;
3661 case NL80211_IFTYPE_AP_VLAN:
3662 case NL80211_IFTYPE_AP:
3663 /* parallel-rx requires this, at least with calls to
3664 * ieee80211_sta_ps_transition()
3665 */
3666 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3667 goto clear;
3668 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3669 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3670 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3671
3672 fastrx.internal_forward =
3673 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3674 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3675 !sdata->u.vlan.sta);
3676 break;
3677 default:
3678 goto clear;
3679 }
3680
3681 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3682 goto clear;
3683
3684 rcu_read_lock();
3685 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3686 if (key) {
3687 switch (key->conf.cipher) {
3688 case WLAN_CIPHER_SUITE_TKIP:
3689 /* we don't want to deal with MMIC in fast-rx */
3690 goto clear_rcu;
3691 case WLAN_CIPHER_SUITE_CCMP:
3692 case WLAN_CIPHER_SUITE_CCMP_256:
3693 case WLAN_CIPHER_SUITE_GCMP:
3694 case WLAN_CIPHER_SUITE_GCMP_256:
3695 break;
3696 default:
3697 /* we also don't want to deal with WEP or cipher scheme
3698 * since those require looking up the key idx in the
3699 * frame, rather than assuming the PTK is used
3700 * (we need to revisit this once we implement the real
3701 * PTK index, which is now valid in the spec, but we
3702 * haven't implemented that part yet)
3703 */
3704 goto clear_rcu;
3705 }
3706
3707 fastrx.key = true;
3708 fastrx.icv_len = key->conf.icv_len;
3709 }
3710
3711 assign = true;
3712 clear_rcu:
3713 rcu_read_unlock();
3714 clear:
3715 __release(check_fast_rx);
3716
3717 if (assign)
3718 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3719
3720 spin_lock_bh(&sta->lock);
3721 old = rcu_dereference_protected(sta->fast_rx, true);
3722 rcu_assign_pointer(sta->fast_rx, new);
3723 spin_unlock_bh(&sta->lock);
3724
3725 if (old)
3726 kfree_rcu(old, rcu_head);
3727}
3728
3729void ieee80211_clear_fast_rx(struct sta_info *sta)
3730{
3731 struct ieee80211_fast_rx *old;
3732
3733 spin_lock_bh(&sta->lock);
3734 old = rcu_dereference_protected(sta->fast_rx, true);
3735 RCU_INIT_POINTER(sta->fast_rx, NULL);
3736 spin_unlock_bh(&sta->lock);
3737
3738 if (old)
3739 kfree_rcu(old, rcu_head);
3740}
3741
3742void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3743{
3744 struct ieee80211_local *local = sdata->local;
3745 struct sta_info *sta;
3746
3747 lockdep_assert_held(&local->sta_mtx);
3748
3749 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3750 if (sdata != sta->sdata &&
3751 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3752 continue;
3753 ieee80211_check_fast_rx(sta);
3754 }
3755}
3756
3757void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3758{
3759 struct ieee80211_local *local = sdata->local;
3760
3761 mutex_lock(&local->sta_mtx);
3762 __ieee80211_check_fast_rx_iface(sdata);
3763 mutex_unlock(&local->sta_mtx);
3764}
3765
3766static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3767 struct ieee80211_fast_rx *fast_rx)
3768{
3769 struct sk_buff *skb = rx->skb;
3770 struct ieee80211_hdr *hdr = (void *)skb->data;
3771 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3772 struct sta_info *sta = rx->sta;
3773 int orig_len = skb->len;
3774 int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3775 struct {
3776 u8 snap[sizeof(rfc1042_header)];
3777 __be16 proto;
3778 } *payload __aligned(2);
3779 struct {
3780 u8 da[ETH_ALEN];
3781 u8 sa[ETH_ALEN];
3782 } addrs __aligned(2);
c9c5962b
JB		 3783 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3784
3785 if (fast_rx->uses_rss)
3786 stats = this_cpu_ptr(sta->pcpu_rx_stats);
49ddf8e6
JB		 3787
3788 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3789 * to a common data structure; drivers can implement that per queue
3790 * but we don't have that information in mac80211
3791 */
3792 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3793 return false;
3794
3795#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3796
3797 /* If using encryption, we also need to have:
3798 * - PN_VALIDATED: similar, but the implementation is tricky
3799 * - DECRYPTED: necessary for PN_VALIDATED
3800 */
3801 if (fast_rx->key &&
3802 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3803 return false;
3804
3805 /* we don't deal with A-MSDU deaggregation here */
3806 if (status->rx_flags & IEEE80211_RX_AMSDU)
3807 return false;
3808
3809 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3810 return false;
3811
3812 if (unlikely(ieee80211_is_frag(hdr)))
3813 return false;
3814
3815 /* Since our interface address cannot be multicast, this
3816 * implicitly also rejects multicast frames without the
3817 * explicit check.
3818 *
3819 * We shouldn't get any *data* frames not addressed to us
3820 * (AP mode will accept multicast *management* frames), but
3821 * punting here will make it go through the full checks in
3822 * ieee80211_accept_frame().
3823 */
3824 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3825 return false;
3826
3827 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3828 IEEE80211_FCTL_TODS)) !=
3829 fast_rx->expected_ds_bits)
3830 goto drop;
3831
3832 /* assign the key to drop unencrypted frames (later)
3833 * and strip the IV/MIC if necessary
3834 */
3835 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3836 /* GCMP header length is the same */
3837 snap_offs += IEEE80211_CCMP_HDR_LEN;
3838 }
3839
3840 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3841 goto drop;
3842 payload = (void *)(skb->data + snap_offs);
3843
3844 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3845 return false;
3846
3847 /* Don't handle these here since they require special code.
3848 * Accept AARP and IPX even though they should come with a
3849 * bridge-tunnel header - but if we get them this way then
3850 * there's little point in discarding them.
3851 */
3852 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3853 payload->proto == fast_rx->control_port_protocol))
3854 return false;
3855
3856 /* after this point, don't punt to the slowpath! */
3857
3858 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3859 pskb_trim(skb, skb->len - fast_rx->icv_len))
3860 goto drop;
3861
3862 if (unlikely(fast_rx->sta_notify)) {
3863 ieee80211_sta_rx_notify(rx->sdata, hdr);
3864 fast_rx->sta_notify = false;
3865 }
3866
3867 /* statistics part of ieee80211_rx_h_sta_process() */
c9c5962b
JB		 3868 stats->last_rx = jiffies;
3869 stats->last_rate = sta_stats_encode_rate(status);
49ddf8e6 3870
c9c5962b 3871 stats->fragments++;
49ddf8e6
JB		 3872
3873 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
c9c5962b
JB		 3874 stats->last_signal = status->signal;
3875 if (!fast_rx->uses_rss)
3876 ewma_signal_add(&sta->rx_stats_avg.signal,
3877 -status->signal);
49ddf8e6
JB		 3878 }
3879
3880 if (status->chains) {
3881 int i;
3882
c9c5962b 3883 stats->chains = status->chains;
49ddf8e6
JB		 3884 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3885 int signal = status->chain_signal[i];
3886
3887 if (!(status->chains & BIT(i)))
3888 continue;
3889
c9c5962b
JB		 3890 stats->chain_signal_last[i] = signal;
3891 if (!fast_rx->uses_rss)
3892 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3893 -signal);
49ddf8e6
JB		 3894 }
3895 }
3896 /* end of statistics */
3897
3898 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3899 goto drop;
3900
3901 /* do the header conversion - first grab the addresses */
3902 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3903 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3904 /* remove the SNAP but leave the ethertype */
3905 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3906 /* push the addresses in front */
3907 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3908
3909 skb->dev = fast_rx->dev;
3910
3911 ieee80211_rx_stats(fast_rx->dev, skb->len);
3912
3913 /* The seqno index has the same property as needed
3914 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3915 * for non-QoS-data frames. Here we know it's a data
3916 * frame, so count MSDUs.
3917 */
c9c5962b
JB		 3918 u64_stats_update_begin(&stats->syncp);
3919 stats->msdu[rx->seqno_idx]++;
3920 stats->bytes += orig_len;
3921 u64_stats_update_end(&stats->syncp);
49ddf8e6
JB		 3922
3923 if (fast_rx->internal_forward) {
3924 struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
3925
3926 if (dsta) {
3927 /*
3928 * Send to wireless media and increase priority by 256
3929 * to keep the received priority instead of
3930 * reclassifying the frame (see cfg80211_classify8021d).
3931 */
3932 skb->priority += 256;
3933 skb->protocol = htons(ETH_P_802_3);
3934 skb_reset_network_header(skb);
3935 skb_reset_mac_header(skb);
3936 dev_queue_xmit(skb);
3937 return true;
3938 }
3939 }
3940
3941 /* deliver to local stack */
3942 skb->protocol = eth_type_trans(skb, fast_rx->dev);
3943 memset(skb->cb, 0, sizeof(skb->cb));
3944 if (rx->napi)
3945 napi_gro_receive(rx->napi, skb);
3946 else
3947 netif_receive_skb(skb);
3948
3949 return true;
3950 drop:
3951 dev_kfree_skb(skb);
c9c5962b 3952 stats->dropped++;
49ddf8e6
JB		 3953 return true;
3954}
3955
4406c376
JB		 3956/*
3957 * This function returns whether or not the SKB
3958 * was destined for RX processing or not, which,
3959 * if consume is true, is equivalent to whether
3960 * or not the skb was consumed.
3961 */
3962static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3963 struct sk_buff *skb, bool consume)
3964{
3965 struct ieee80211_local *local = rx->local;
3966 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 3967
3968 rx->skb = skb;
4406c376 3969
49ddf8e6
JB		 3970 /* See if we can do fast-rx; if we have to copy we already lost,
3971 * so punt in that case. We should never have to deliver a data
3972 * frame to multiple interfaces anyway.
3973 *
3974 * We skip the ieee80211_accept_frame() call and do the necessary
3975 * checking inside ieee80211_invoke_fast_rx().
3976 */
3977 if (consume && rx->sta) {
3978 struct ieee80211_fast_rx *fast_rx;
3979
3980 fast_rx = rcu_dereference(rx->sta->fast_rx);
3981 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
3982 return true;
3983 }
3984
a58fbe1a 3985 if (!ieee80211_accept_frame(rx))
4406c376
JB		 3986 return false;
3987
4406c376
JB		 3988 if (!consume) {
3989 skb = skb_copy(skb, GFP_ATOMIC);
3990 if (!skb) {
3991 if (net_ratelimit())
3992 wiphy_debug(local->hw.wiphy,
b305dae4 3993 "failed to copy skb for %s\n",
4406c376
JB		 3994 sdata->name);
3995 return true;
3996 }
3997
3998 rx->skb = skb;
3999 }
4000
4001 ieee80211_invoke_rx_handlers(rx);
4002 return true;
4003}
4004
571ecf67 4005/*
6b59db7d 4006 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 4007 * be called with rcu_read_lock protection.
571ecf67 4008 */
71ebb4aa 4009static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
d63b548f 4010 struct ieee80211_sta *pubsta,
af9f9b22
JB		 4011 struct sk_buff *skb,
4012 struct napi_struct *napi)
571ecf67
JB		 4013{
4014 struct ieee80211_local *local = hw_to_local(hw);
4015 struct ieee80211_sub_if_data *sdata;
571ecf67 4016 struct ieee80211_hdr *hdr;
e3cf8b3f 4017 __le16 fc;
5cf121c3 4018 struct ieee80211_rx_data rx;
4406c376 4019 struct ieee80211_sub_if_data *prev;
83e7e4ce 4020 struct rhlist_head *tmp;
e3cf8b3f 4021 int err = 0;
571ecf67 4022
e3cf8b3f 4023 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 4024 memset(&rx, 0, sizeof(rx));
4025 rx.skb = skb;
4026 rx.local = local;
af9f9b22 4027 rx.napi = napi;
72abd81b 4028
e3cf8b3f 4029 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 4030 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 4031
4a4f1a58
JB		 4032 if (ieee80211_is_mgmt(fc)) {
4033 /* drop frame if too short for header */
4034 if (skb->len < ieee80211_hdrlen(fc))
4035 err = -ENOBUFS;
4036 else
4037 err = skb_linearize(skb);
4038 } else {
e3cf8b3f 4039 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 4040 }
e3cf8b3f
ZY		 4041
4042 if (err) {
4043 dev_kfree_skb(skb);
4044 return;
4045 }
4046
4047 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 4048 ieee80211_parse_qos(&rx);
d1c3a37c 4049 ieee80211_verify_alignment(&rx);
38f3714d 4050
d48b2968
JB		 4051 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4052 ieee80211_is_beacon(hdr->frame_control)))
4053 ieee80211_scan_rx(local, skb);
4054
d63b548f
JB		 4055 if (pubsta) {
4056 rx.sta = container_of(pubsta, struct sta_info, sta);
4057 rx.sdata = rx.sta->sdata;
4058 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4059 return;
4060 goto out;
4061 } else if (ieee80211_is_data(fc)) {
4062 struct sta_info *sta, *prev_sta;
7bedd0cf 4063
56af3268 4064 prev_sta = NULL;
4406c376 4065
83e7e4ce 4066 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 4067 if (!prev_sta) {
4068 prev_sta = sta;
4069 continue;
4070 }
4071
4072 rx.sta = prev_sta;
4073 rx.sdata = prev_sta->sdata;
4406c376 4074 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 4075
56af3268 4076 prev_sta = sta;
4406c376 4077 }
56af3268
BG		 4078
4079 if (prev_sta) {
4080 rx.sta = prev_sta;
4081 rx.sdata = prev_sta->sdata;
4082
4406c376 4083 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 4084 return;
8e26d5ad 4085 goto out;
56af3268 4086 }
4406c376
JB		 4087 }
4088
4b0dd98e 4089 prev = NULL;
b2e7771e 4090
4b0dd98e
JB		 4091 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4092 if (!ieee80211_sdata_running(sdata))
4093 continue;
340e11f3 4094
4b0dd98e
JB		 4095 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4096 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4097 continue;
340e11f3 4098
4b0dd98e
JB		 4099 /*
4100 * frame is destined for this interface, but if it's
4101 * not also for the previous one we handle that after
4102 * the loop to avoid copying the SKB once too much
4103 */
4bb29f8c 4104
4b0dd98e 4105 if (!prev) {
abe60632 4106 prev = sdata;
4b0dd98e 4107 continue;
340e11f3 4108 }
4bb29f8c 4109
7852e361 4110 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 4111 rx.sdata = prev;
4112 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 4113
4b0dd98e
JB		 4114 prev = sdata;
4115 }
4116
4117 if (prev) {
7852e361 4118 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 4119 rx.sdata = prev;
4406c376 4120
4b0dd98e
JB		 4121 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4122 return;
571ecf67 4123 }
4406c376 4124
8e26d5ad 4125 out:
4406c376 4126 dev_kfree_skb(skb);
571ecf67 4127}
6368e4b1
RR		 4128
4129/*
4130 * This is the receive path handler. It is called by a low level driver when an
4131 * 802.11 MPDU is received from the hardware.
4132 */
d63b548f
JB		 4133void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4134 struct sk_buff *skb, struct napi_struct *napi)
6368e4b1
RR		 4135{
4136 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 4137 struct ieee80211_rate *rate = NULL;
4138 struct ieee80211_supported_band *sband;
f1d58c25 4139 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 4140
d20ef63d
JB		 4141 WARN_ON_ONCE(softirq_count() == 0);
4142
57fbcce3 4143 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
77a980dc 4144 goto drop;
8318d78a
JB		 4145
4146 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 4147 if (WARN_ON(!sband))
4148 goto drop;
8318d78a 4149
89c3a8ac
JB		 4150 /*
4151 * If we're suspending, it is possible although not too likely
4152 * that we'd be receiving frames after having already partially
4153 * quiesced the stack. We can't process such frames then since
4154 * that might, for example, cause stations to be added or other
4155 * driver callbacks be invoked.
4156 */
77a980dc
JB		 4157 if (unlikely(local->quiescing || local->suspended))
4158 goto drop;
89c3a8ac 4159
04800ada
AN		 4160 /* We might be during a HW reconfig, prevent Rx for the same reason */
4161 if (unlikely(local->in_reconfig))
4162 goto drop;
4163
ea77f12f
JB		 4164 /*
4165 * The same happens when we're not even started,
4166 * but that's worth a warning.
4167 */
77a980dc
JB		 4168 if (WARN_ON(!local->started))
4169 goto drop;
ea77f12f 4170
fc885189 4171 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 4172 /*
fc885189
JB		 4173 * Validate the rate, unless a PLCP error means that
4174 * we probably can't have a valid rate here anyway.
e5d6eb83 4175 */
fc885189
JB		 4176
4177 if (status->flag & RX_FLAG_HT) {
4178 /*
4179 * rate_idx is MCS index, which can be [0-76]
4180 * as documented on:
4181 *
4182 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4183 *
4184 * Anything else would be some sort of driver or
4185 * hardware error. The driver should catch hardware
4186 * errors.
4187 */
444e3803 4188 if (WARN(status->rate_idx > 76,
fc885189
JB		 4189 "Rate marked as an HT rate but passed "
4190 "status->rate_idx is not "
4191 "an MCS index [0-76]: %d (0x%02x)\n",
4192 status->rate_idx,
4193 status->rate_idx))
4194 goto drop;
5614618e
JB		 4195 } else if (status->flag & RX_FLAG_VHT) {
4196 if (WARN_ONCE(status->rate_idx > 9 ||
4197 !status->vht_nss ||
4198 status->vht_nss > 8,
4199 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4200 status->rate_idx, status->vht_nss))
4201 goto drop;
fc885189 4202 } else {
444e3803 4203 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 4204 goto drop;
4205 rate = &sband->bitrates[status->rate_idx];
4206 }
0fb8ca45 4207 }
6368e4b1 4208
554891e6
JB		 4209 status->rx_flags = 0;
4210
6368e4b1
RR		 4211 /*
4212 * key references and virtual interfaces are protected using RCU
4213 * and this requires that we are in a read-side RCU section during
4214 * receive processing
4215 */
4216 rcu_read_lock();
4217
4218 /*
4219 * Frames with failed FCS/PLCP checksum are not returned,
4220 * all other frames are returned without radiotap header
4221 * if it was previously present.
4222 * Also, frames with less than 16 bytes are dropped.
4223 */
f1d58c25 4224 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 4225 if (!skb) {
4226 rcu_read_unlock();
4227 return;
4228 }
4229
e1e54068
JB		 4230 ieee80211_tpt_led_trig_rx(local,
4231 ((struct ieee80211_hdr *)skb->data)->frame_control,
4232 skb->len);
d63b548f
JB		 4233
4234 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
6368e4b1
RR		 4235
4236 rcu_read_unlock();
77a980dc
JB		 4237
4238 return;
4239 drop:
4240 kfree_skb(skb);
6368e4b1 4241}
af9f9b22 4242EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 4243
4244/* This is a version of the rx handler that can be called from hard irq
4245 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 4246void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 4247{
4248 struct ieee80211_local *local = hw_to_local(hw);
4249
4250 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4251
571ecf67
JB		 4252 skb->pkt_type = IEEE80211_RX_MSG;
4253 skb_queue_tail(&local->skb_queue, skb);
4254 tasklet_schedule(&local->tasklet);
4255}
4256EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)