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Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
571ecf67
JB		 2/*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 6 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 7 * Copyright 2013-2014 Intel Mobile Communications GmbH
b7540d8f 8 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
c15353be 9 * Copyright (C) 2018-2019 Intel Corporation
571ecf67
JB		 10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
06470f74 20#include <linux/bitops.h>
571ecf67
JB		 21#include <net/mac80211.h>
22#include <net/ieee80211_radiotap.h>
d26ad377 23#include <asm/unaligned.h>
571ecf67
JB		 24
25#include "ieee80211_i.h"
24487981 26#include "driver-ops.h"
2c8dccc7 27#include "led.h"
33b64eb2 28#include "mesh.h"
571ecf67
JB		 29#include "wep.h"
30#include "wpa.h"
31#include "tkip.h"
32#include "wme.h"
1d8d3dec 33#include "rate.h"
571ecf67 34
5a490510
JB		 35static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
36{
37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
38
39 u64_stats_update_begin(&tstats->syncp);
40 tstats->rx_packets++;
41 tstats->rx_bytes += len;
42 u64_stats_update_end(&tstats->syncp);
43}
44
a6828493
JB		 45static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
47{
48 __le16 fc = hdr->frame_control;
49
50 if (ieee80211_is_data(fc)) {
51 if (len < 24) /* drop incorrect hdr len (data) */
52 return NULL;
53
54 if (ieee80211_has_a4(fc))
55 return NULL;
56 if (ieee80211_has_tods(fc))
57 return hdr->addr1;
58 if (ieee80211_has_fromds(fc))
59 return hdr->addr2;
60
61 return hdr->addr3;
62 }
63
64 if (ieee80211_is_mgmt(fc)) {
65 if (len < 24) /* drop incorrect hdr len (mgmt) */
66 return NULL;
67 return hdr->addr3;
68 }
69
70 if (ieee80211_is_ctl(fc)) {
71 if (ieee80211_is_pspoll(fc))
72 return hdr->addr1;
73
74 if (ieee80211_is_back_req(fc)) {
75 switch (type) {
76 case NL80211_IFTYPE_STATION:
77 return hdr->addr2;
78 case NL80211_IFTYPE_AP:
79 case NL80211_IFTYPE_AP_VLAN:
80 return hdr->addr1;
81 default:
82 break; /* fall through to the return */
83 }
84 }
85 }
86
87 return NULL;
88}
89
b2e7771e
JB		 90/*
91 * monitor mode reception
92 *
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
95 */
30841f5c
JB		 96static void remove_monitor_info(struct sk_buff *skb,
97 unsigned int present_fcs_len,
c096b92a 98 unsigned int rtap_space)
b2e7771e 99{
30841f5c
JB		 100 if (present_fcs_len)
101 __pskb_trim(skb, skb->len - present_fcs_len);
c096b92a 102 __pskb_pull(skb, rtap_space);
b2e7771e
JB		 103}
104
1f7bba79 105static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
c096b92a 106 unsigned int rtap_space)
b2e7771e 107{
f1d58c25 108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 109 struct ieee80211_hdr *hdr;
110
c096b92a 111 hdr = (void *)(skb->data + rtap_space);
b2e7771e 112
4c298677 113 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
17883048 114 RX_FLAG_FAILED_PLCP_CRC |
c3d1f875
ST		 115 RX_FLAG_ONLY_MONITOR |
116 RX_FLAG_NO_PSDU))
6b59db7d
ZG		 117 return true;
118
c096b92a 119 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
6b59db7d
ZG		 120 return true;
121
87228f57
HH		 122 if (ieee80211_is_ctl(hdr->frame_control) &&
123 !ieee80211_is_pspoll(hdr->frame_control) &&
124 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 125 return true;
126
127 return false;
b2e7771e
JB		 128}
129
601ae7f2 130static int
1f7bba79
JB		 131ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
132 struct ieee80211_rx_status *status,
133 struct sk_buff *skb)
601ae7f2
BR		 134{
135 int len;
136
137 /* always present fields */
a144f378 138 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 139
a144f378 140 /* allocate extra bitmaps */
a144f378
JB		 141 if (status->chains)
142 len += 4 * hweight8(status->chains);
efc38dd7
JB		 143 /* vendor presence bitmap */
144 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
145 len += 4;
90b9e446
JB		 146
147 if (ieee80211_have_rx_timestamp(status)) {
148 len = ALIGN(len, 8);
601ae7f2 149 len += 8;
90b9e446 150 }
30686bf7 151 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 152 len += 1;
601ae7f2 153
a144f378
JB		 154 /* antenna field, if we don't have per-chain info */
155 if (!status->chains)
156 len += 1;
157
90b9e446
JB		 158 /* padding for RX_FLAGS if necessary */
159 len = ALIGN(len, 2);
601ae7f2 160
da6a4352 161 if (status->encoding == RX_ENC_HT) /* HT info */
6d744bac
JB		 162 len += 3;
163
4c298677 164 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 165 len = ALIGN(len, 4);
4c298677
JB		 166 len += 8;
167 }
168
da6a4352 169 if (status->encoding == RX_ENC_VHT) {
51648921
JB		 170 len = ALIGN(len, 2);
171 len += 12;
172 }
173
99ee7cae
JB		 174 if (local->hw.radiotap_timestamp.units_pos >= 0) {
175 len = ALIGN(len, 8);
176 len += 12;
177 }
178
41cbb0f5
LC		 179 if (status->encoding == RX_ENC_HE &&
180 status->flag & RX_FLAG_RADIOTAP_HE) {
181 len = ALIGN(len, 2);
182 len += 12;
183 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
184 }
185
186 if (status->encoding == RX_ENC_HE &&
187 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
188 len = ALIGN(len, 2);
189 len += 12;
190 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
191 }
192
c3d1f875
ST		 193 if (status->flag & RX_FLAG_NO_PSDU)
194 len += 1;
195
d1332e7b
ST		 196 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
197 len = ALIGN(len, 2);
198 len += 4;
199 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
200 }
201
a144f378
JB		 202 if (status->chains) {
203 /* antenna and antenna signal fields */
204 len += 2 * hweight8(status->chains);
205 }
206
1f7bba79 207 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
c15353be
LK		 208 struct ieee80211_vendor_radiotap *rtap;
209 int vendor_data_offset = 0;
210
211 /*
212 * The position to look at depends on the existence (or non-
213 * existence) of other elements, so take that into account...
214 */
215 if (status->flag & RX_FLAG_RADIOTAP_HE)
216 vendor_data_offset +=
217 sizeof(struct ieee80211_radiotap_he);
218 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
219 vendor_data_offset +=
220 sizeof(struct ieee80211_radiotap_he_mu);
221 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
222 vendor_data_offset +=
223 sizeof(struct ieee80211_radiotap_lsig);
224
225 rtap = (void *)&skb->data[vendor_data_offset];
1f7bba79 226
1f7bba79
JB		 227 /* alignment for fixed 6-byte vendor data header */
228 len = ALIGN(len, 2);
229 /* vendor data header */
230 len += 6;
231 if (WARN_ON(rtap->align == 0))
232 rtap->align = 1;
233 len = ALIGN(len, rtap->align);
234 len += rtap->len + rtap->pad;
235 }
236
601ae7f2
BR		 237 return len;
238}
239
9e478066
JB		 240static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
241 struct sk_buff *skb,
c096b92a 242 int rtap_space)
9e478066
JB		 243{
244 struct {
245 struct ieee80211_hdr_3addr hdr;
246 u8 category;
247 u8 action_code;
7c53eb5d 248 } __packed __aligned(2) action;
9e478066
JB		 249
250 if (!sdata)
251 return;
252
253 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
254
c096b92a 255 if (skb->len < rtap_space + sizeof(action) +
9e478066
JB		 256 VHT_MUMIMO_GROUPS_DATA_LEN)
257 return;
258
259 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
260 return;
261
c096b92a 262 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
9e478066
JB		 263
264 if (!ieee80211_is_action(action.hdr.frame_control))
265 return;
266
267 if (action.category != WLAN_CATEGORY_VHT)
268 return;
269
270 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
271 return;
272
273 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
274 return;
275
276 skb = skb_copy(skb, GFP_ATOMIC);
277 if (!skb)
278 return;
279
9e478066
JB		 280 skb_queue_tail(&sdata->skb_queue, skb);
281 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
282}
283
00ea6deb 284/*
601ae7f2
BR		 285 * ieee80211_add_rx_radiotap_header - add radiotap header
286 *
287 * add a radiotap header containing all the fields which the hardware provided.
288 */
289static void
290ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
291 struct sk_buff *skb,
601ae7f2 292 struct ieee80211_rate *rate,
973ef21a 293 int rtap_len, bool has_fcs)
601ae7f2 294{
f1d58c25 295 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 296 struct ieee80211_radiotap_header *rthdr;
297 unsigned char *pos;
a144f378
JB		 298 __le32 *it_present;
299 u32 it_present_val;
6a86b9c7 300 u16 rx_flags = 0;
a5e70697 301 u16 channel_flags = 0;
a144f378
JB		 302 int mpdulen, chain;
303 unsigned long chains = status->chains;
1f7bba79 304 struct ieee80211_vendor_radiotap rtap = {};
41cbb0f5
LC		 305 struct ieee80211_radiotap_he he = {};
306 struct ieee80211_radiotap_he_mu he_mu = {};
d1332e7b 307 struct ieee80211_radiotap_lsig lsig = {};
41cbb0f5
LC		 308
309 if (status->flag & RX_FLAG_RADIOTAP_HE) {
310 he = *(struct ieee80211_radiotap_he *)skb->data;
311 skb_pull(skb, sizeof(he));
312 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
313 }
314
315 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
316 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
317 skb_pull(skb, sizeof(he_mu));
318 }
1f7bba79 319
d1332e7b
ST		 320 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
321 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
322 skb_pull(skb, sizeof(lsig));
323 }
324
1f7bba79
JB		 325 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
326 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
327 /* rtap.len and rtap.pad are undone immediately */
328 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
329 }
f4bda337
TP		 330
331 mpdulen = skb->len;
30686bf7 332 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 333 mpdulen += FCS_LEN;
601ae7f2 334
d58ff351 335 rthdr = skb_push(skb, rtap_len);
1f7bba79 336 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 337 it_present = &rthdr->it_present;
601ae7f2
BR		 338
339 /* radiotap header, set always present flags */
0059b2b1 340 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 341 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
342 BIT(IEEE80211_RADIOTAP_CHANNEL) |
343 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
344
345 if (!status->chains)
346 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
347
348 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
349 it_present_val |=
350 BIT(IEEE80211_RADIOTAP_EXT) |
351 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
352 put_unaligned_le32(it_present_val, it_present);
353 it_present++;
354 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
355 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
356 }
601ae7f2 357
1f7bba79
JB		 358 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
359 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
360 BIT(IEEE80211_RADIOTAP_EXT);
361 put_unaligned_le32(it_present_val, it_present);
362 it_present++;
363 it_present_val = rtap.present;
364 }
365
a144f378
JB		 366 put_unaligned_le32(it_present_val, it_present);
367
368 pos = (void *)(it_present + 1);
369
601ae7f2
BR		 370 /* the order of the following fields is important */
371
372 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 373 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 374 /* padding */
375 while ((pos - (u8 *)rthdr) & 7)
376 *pos++ = 0;
f4bda337
TP		 377 put_unaligned_le64(
378 ieee80211_calculate_rx_timestamp(local, status,
379 mpdulen, 0),
380 pos);
1df332e8 381 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 382 pos += 8;
383 }
384
385 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 386 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 387 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 388 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
389 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
7fdd69c5 390 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
b4f28bbb 391 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 392 pos++;
393
394 /* IEEE80211_RADIOTAP_RATE */
da6a4352 395 if (!rate || status->encoding != RX_ENC_LEGACY) {
0fb8ca45 396 /*
f8d1ccf1 397 * Without rate information don't add it. If we have,
38f37be2 398 * MCS information is a separate field in radiotap,
73b48099
JB		 399 * added below. The byte here is needed as padding
400 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 401 */
402 *pos = 0;
8d6f658e 403 } else {
2103dec1 404 int shift = 0;
ebe6c7ba 405 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
da6a4352 406 if (status->bw == RATE_INFO_BW_10)
2103dec1 407 shift = 1;
da6a4352 408 else if (status->bw == RATE_INFO_BW_5)
2103dec1
SW		 409 shift = 2;
410 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 411 }
601ae7f2
BR		 412 pos++;
413
414 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 415 put_unaligned_le16(status->freq, pos);
601ae7f2 416 pos += 2;
da6a4352 417 if (status->bw == RATE_INFO_BW_10)
a5e70697 418 channel_flags |= IEEE80211_CHAN_HALF;
da6a4352 419 else if (status->bw == RATE_INFO_BW_5)
a5e70697
SW		 420 channel_flags |= IEEE80211_CHAN_QUARTER;
421
57fbcce3 422 if (status->band == NL80211_BAND_5GHZ)
a5e70697 423 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
da6a4352 424 else if (status->encoding != RX_ENC_LEGACY)
a5e70697 425 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 426 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 427 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 428 else if (rate)
3a5c5e81 429 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 430 else
a5e70697
SW		 431 channel_flags |= IEEE80211_CHAN_2GHZ;
432 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 433 pos += 2;
434
435 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 436 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 437 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 438 *pos = status->signal;
439 rthdr->it_present |=
440 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
441 pos++;
442 }
443
601ae7f2
BR		 444 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
445
a144f378
JB		 446 if (!status->chains) {
447 /* IEEE80211_RADIOTAP_ANTENNA */
448 *pos = status->antenna;
449 pos++;
450 }
601ae7f2 451
601ae7f2
BR		 452 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
453
454 /* IEEE80211_RADIOTAP_RX_FLAGS */
455 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 456 if ((pos - (u8 *)rthdr) & 1)
90b9e446 457 *pos++ = 0;
aae89831 458 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 459 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
460 put_unaligned_le16(rx_flags, pos);
601ae7f2 461 pos += 2;
6d744bac 462
da6a4352 463 if (status->encoding == RX_ENC_HT) {
786677d1
OR		 464 unsigned int stbc;
465
6d744bac 466 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 467 *pos++ = local->hw.radiotap_mcs_details;
6d744bac 468 *pos = 0;
7fdd69c5 469 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
6d744bac 470 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
da6a4352 471 if (status->bw == RATE_INFO_BW_40)
6d744bac 472 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
7fdd69c5 473 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
ac55d2fe 474 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
7fdd69c5 475 if (status->enc_flags & RX_ENC_FLAG_LDPC)
63c361f5 476 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
7fdd69c5 477 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
786677d1 478 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 479 pos++;
480 *pos++ = status->rate_idx;
481 }
4c298677
JB		 482
483 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
484 u16 flags = 0;
485
486 /* ensure 4 byte alignment */
487 while ((pos - (u8 *)rthdr) & 3)
488 pos++;
489 rthdr->it_present |=
490 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
491 put_unaligned_le32(status->ampdu_reference, pos);
492 pos += 4;
4c298677
JB		 493 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
494 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
495 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
496 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
497 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
498 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
499 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
500 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
7299d6f7
JB		 501 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
502 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
503 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
504 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
4c298677
JB		 505 put_unaligned_le16(flags, pos);
506 pos += 2;
507 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
508 *pos++ = status->ampdu_delimiter_crc;
509 else
510 *pos++ = 0;
511 *pos++ = 0;
512 }
90b9e446 513
da6a4352 514 if (status->encoding == RX_ENC_VHT) {
51648921
JB		 515 u16 known = local->hw.radiotap_vht_details;
516
517 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 518 put_unaligned_le16(known, pos);
519 pos += 2;
520 /* flags */
7fdd69c5 521 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
51648921 522 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5 523 /* in VHT, STBC is binary */
7fdd69c5 524 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
63c361f5 525 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
7fdd69c5 526 if (status->enc_flags & RX_ENC_FLAG_BF)
fb378c23 527 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 528 pos++;
529 /* bandwidth */
da6a4352
JB		 530 switch (status->bw) {
531 case RATE_INFO_BW_80:
51648921 532 *pos++ = 4;
da6a4352
JB		 533 break;
534 case RATE_INFO_BW_160:
51648921 535 *pos++ = 11;
da6a4352
JB		 536 break;
537 case RATE_INFO_BW_40:
51648921 538 *pos++ = 1;
da6a4352
JB		 539 break;
540 default:
51648921 541 *pos++ = 0;
da6a4352 542 }
51648921 543 /* MCS/NSS */
8613c948 544 *pos = (status->rate_idx << 4) | status->nss;
51648921
JB		 545 pos += 4;
546 /* coding field */
7fdd69c5 547 if (status->enc_flags & RX_ENC_FLAG_LDPC)
63c361f5 548 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 549 pos++;
550 /* group ID */
551 pos++;
552 /* partial_aid */
553 pos += 2;
554 }
555
99ee7cae
JB		 556 if (local->hw.radiotap_timestamp.units_pos >= 0) {
557 u16 accuracy = 0;
558 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
559
560 rthdr->it_present |=
561 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
562
563 /* ensure 8 byte alignment */
564 while ((pos - (u8 *)rthdr) & 7)
565 pos++;
566
567 put_unaligned_le64(status->device_timestamp, pos);
568 pos += sizeof(u64);
569
570 if (local->hw.radiotap_timestamp.accuracy >= 0) {
571 accuracy = local->hw.radiotap_timestamp.accuracy;
572 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
573 }
574 put_unaligned_le16(accuracy, pos);
575 pos += sizeof(u16);
576
577 *pos++ = local->hw.radiotap_timestamp.units_pos;
578 *pos++ = flags;
579 }
580
41cbb0f5
LC		 581 if (status->encoding == RX_ENC_HE &&
582 status->flag & RX_FLAG_RADIOTAP_HE) {
331aead5 583#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
41cbb0f5
LC		 584
585 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
586 he.data6 |= HE_PREP(DATA6_NSTS,
587 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
588 status->enc_flags));
589 he.data3 |= HE_PREP(DATA3_STBC, 1);
590 } else {
591 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
592 }
593
594#define CHECK_GI(s) \
595 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
596 (int)NL80211_RATE_INFO_HE_GI_##s)
597
598 CHECK_GI(0_8);
599 CHECK_GI(1_6);
600 CHECK_GI(3_2);
601
602 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
603 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
604 he.data3 |= HE_PREP(DATA3_CODING,
605 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
606
607 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
608
609 switch (status->bw) {
610 case RATE_INFO_BW_20:
611 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
612 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
613 break;
614 case RATE_INFO_BW_40:
615 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
616 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
617 break;
618 case RATE_INFO_BW_80:
619 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
620 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
621 break;
622 case RATE_INFO_BW_160:
623 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
624 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
625 break;
626 case RATE_INFO_BW_HE_RU:
627#define CHECK_RU_ALLOC(s) \
628 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
629 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
630
631 CHECK_RU_ALLOC(26);
632 CHECK_RU_ALLOC(52);
633 CHECK_RU_ALLOC(106);
634 CHECK_RU_ALLOC(242);
635 CHECK_RU_ALLOC(484);
636 CHECK_RU_ALLOC(996);
637 CHECK_RU_ALLOC(2x996);
638
639 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
640 status->he_ru + 4);
641 break;
642 default:
643 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
644 }
645
646 /* ensure 2 byte alignment */
647 while ((pos - (u8 *)rthdr) & 1)
648 pos++;
649 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
650 memcpy(pos, &he, sizeof(he));
651 pos += sizeof(he);
652 }
653
654 if (status->encoding == RX_ENC_HE &&
655 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
656 /* ensure 2 byte alignment */
657 while ((pos - (u8 *)rthdr) & 1)
658 pos++;
659 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
660 memcpy(pos, &he_mu, sizeof(he_mu));
661 pos += sizeof(he_mu);
662 }
663
c3d1f875
ST		 664 if (status->flag & RX_FLAG_NO_PSDU) {
665 rthdr->it_present |=
666 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
667 *pos++ = status->zero_length_psdu_type;
668 }
669
d1332e7b
ST		 670 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
671 /* ensure 2 byte alignment */
672 while ((pos - (u8 *)rthdr) & 1)
673 pos++;
674 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
675 memcpy(pos, &lsig, sizeof(lsig));
676 pos += sizeof(lsig);
677 }
678
a144f378
JB		 679 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
680 *pos++ = status->chain_signal[chain];
681 *pos++ = chain;
682 }
1f7bba79
JB		 683
684 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
685 /* ensure 2 byte alignment for the vendor field as required */
686 if ((pos - (u8 *)rthdr) & 1)
687 *pos++ = 0;
688 *pos++ = rtap.oui[0];
689 *pos++ = rtap.oui[1];
690 *pos++ = rtap.oui[2];
691 *pos++ = rtap.subns;
692 put_unaligned_le16(rtap.len, pos);
693 pos += 2;
694 /* align the actual payload as requested */
695 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
696 *pos++ = 0;
697 /* data (and possible padding) already follows */
698 }
601ae7f2
BR		 699}
700
127f60bf
JB		 701static struct sk_buff *
702ieee80211_make_monitor_skb(struct ieee80211_local *local,
703 struct sk_buff **origskb,
704 struct ieee80211_rate *rate,
c096b92a 705 int rtap_space, bool use_origskb)
127f60bf
JB		 706{
707 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
708 int rt_hdrlen, needed_headroom;
709 struct sk_buff *skb;
710
711 /* room for the radiotap header based on driver features */
712 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
c096b92a 713 needed_headroom = rt_hdrlen - rtap_space;
127f60bf
JB		 714
715 if (use_origskb) {
716 /* only need to expand headroom if necessary */
717 skb = *origskb;
718 *origskb = NULL;
719
720 /*
721 * This shouldn't trigger often because most devices have an
722 * RX header they pull before we get here, and that should
723 * be big enough for our radiotap information. We should
724 * probably export the length to drivers so that we can have
725 * them allocate enough headroom to start with.
726 */
727 if (skb_headroom(skb) < needed_headroom &&
728 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
729 dev_kfree_skb(skb);
730 return NULL;
731 }
732 } else {
733 /*
734 * Need to make a copy and possibly remove radiotap header
735 * and FCS from the original.
736 */
737 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
738
739 if (!skb)
740 return NULL;
741 }
742
743 /* prepend radiotap information */
744 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
745
746 skb_reset_mac_header(skb);
747 skb->ip_summed = CHECKSUM_UNNECESSARY;
748 skb->pkt_type = PACKET_OTHERHOST;
749 skb->protocol = htons(ETH_P_802_2);
750
751 return skb;
752}
753
b2e7771e
JB		 754/*
755 * This function copies a received frame to all monitor interfaces and
756 * returns a cleaned-up SKB that no longer includes the FCS nor the
757 * radiotap header the driver might have added.
758 */
759static struct sk_buff *
760ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 761 struct ieee80211_rate *rate)
b2e7771e 762{
f1d58c25 763 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 764 struct ieee80211_sub_if_data *sdata;
127f60bf 765 struct sk_buff *monskb = NULL;
b2e7771e 766 int present_fcs_len = 0;
c096b92a 767 unsigned int rtap_space = 0;
42bd20d9
AE		 768 struct ieee80211_sub_if_data *monitor_sdata =
769 rcu_dereference(local->monitor_sdata);
127f60bf 770 bool only_monitor = false;
8020919a 771 unsigned int min_head_len;
1f7bba79 772
41cbb0f5
LC		 773 if (status->flag & RX_FLAG_RADIOTAP_HE)
774 rtap_space += sizeof(struct ieee80211_radiotap_he);
775
776 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
777 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
778
d359bbce
IP		 779 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
780 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
781
1f7bba79 782 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
d359bbce
IP		 783 struct ieee80211_vendor_radiotap *rtap =
784 (void *)(origskb->data + rtap_space);
1f7bba79 785
c096b92a 786 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
1f7bba79 787 }
b2e7771e 788
8020919a
IP		 789 min_head_len = rtap_space;
790
b2e7771e
JB		 791 /*
792 * First, we may need to make a copy of the skb because
793 * (1) we need to modify it for radiotap (if not present), and
794 * (2) the other RX handlers will modify the skb we got.
795 *
796 * We don't need to, of course, if we aren't going to return
797 * the SKB because it has a bad FCS/PLCP checksum.
798 */
0869aea0 799
8020919a
IP		 800 if (!(status->flag & RX_FLAG_NO_PSDU)) {
801 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
802 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
803 /* driver bug */
804 WARN_ON(1);
805 dev_kfree_skb(origskb);
806 return NULL;
807 }
808 present_fcs_len = FCS_LEN;
30841f5c 809 }
8020919a
IP		 810
811 /* also consider the hdr->frame_control */
812 min_head_len += 2;
30841f5c 813 }
b2e7771e 814
8020919a
IP		 815 /* ensure that the expected data elements are in skb head */
816 if (!pskb_may_pull(origskb, min_head_len)) {
e3cf8b3f
ZY		 817 dev_kfree_skb(origskb);
818 return NULL;
819 }
820
c096b92a 821 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
127f60bf 822
17883048 823 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
127f60bf 824 if (only_monitor) {
b2e7771e
JB		 825 dev_kfree_skb(origskb);
826 return NULL;
827 }
828
c096b92a 829 remove_monitor_info(origskb, present_fcs_len, rtap_space);
30841f5c 830 return origskb;
b2e7771e
JB		 831 }
832
c096b92a 833 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
9e478066 834
f64331d5 835 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
127f60bf
JB		 836 bool last_monitor = list_is_last(&sdata->u.mntr.list,
837 &local->mon_list);
838
839 if (!monskb)
840 monskb = ieee80211_make_monitor_skb(local, &origskb,
c096b92a 841 rate, rtap_space,
127f60bf
JB		 842 only_monitor &&
843 last_monitor);
844
845 if (monskb) {
846 struct sk_buff *skb;
847
848 if (last_monitor) {
849 skb = monskb;
850 monskb = NULL;
851 } else {
852 skb = skb_clone(monskb, GFP_ATOMIC);
853 }
854
855 if (skb) {
856 skb->dev = sdata->dev;
857 ieee80211_rx_stats(skb->dev, skb->len);
858 netif_receive_skb(skb);
b2e7771e
JB		 859 }
860 }
861
127f60bf
JB		 862 if (last_monitor)
863 break;
b2e7771e
JB		 864 }
865
127f60bf
JB		 866 /* this happens if last_monitor was erroneously false */
867 dev_kfree_skb(monskb);
868
869 /* ditto */
870 if (!origskb)
871 return NULL;
b2e7771e 872
c096b92a 873 remove_monitor_info(origskb, present_fcs_len, rtap_space);
b2e7771e
JB		 874 return origskb;
875}
876
5cf121c3 877static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 878{
238f74a2 879 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 880 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 881 int tid, seqno_idx, security_idx;
6e0d114d
JB		 882
883 /* does the frame have a qos control field? */
238f74a2
HH		 884 if (ieee80211_is_data_qos(hdr->frame_control)) {
885 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 886 /* frame has qos control */
238f74a2 887 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 888 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 889 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 890
891 seqno_idx = tid;
892 security_idx = tid;
6e0d114d 893 } else {
1411f9b5
JB		 894 /*
895 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
896 *
897 * Sequence numbers for management frames, QoS data
898 * frames with a broadcast/multicast address in the
899 * Address 1 field, and all non-QoS data frames sent
900 * by QoS STAs are assigned using an additional single
901 * modulo-4096 counter, [...]
902 *
903 * We also use that counter for non-QoS STAs.
904 */
5a306f58 905 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 906 security_idx = 0;
907 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 908 security_idx = IEEE80211_NUM_TIDS;
9e26297a 909 tid = 0;
6e0d114d 910 }
52865dfd 911
9e26297a
JB		 912 rx->seqno_idx = seqno_idx;
913 rx->security_idx = security_idx;
6e0d114d
JB		 914 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
915 * For now, set skb->priority to 0 for other cases. */
916 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 917}
6e0d114d 918
d1c3a37c
JB		 919/**
920 * DOC: Packet alignment
921 *
922 * Drivers always need to pass packets that are aligned to two-byte boundaries
923 * to the stack.
924 *
925 * Additionally, should, if possible, align the payload data in a way that
926 * guarantees that the contained IP header is aligned to a four-byte
927 * boundary. In the case of regular frames, this simply means aligning the
928 * payload to a four-byte boundary (because either the IP header is directly
929 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 930 * in front of it). If the payload data is not properly aligned and the
931 * architecture doesn't support efficient unaligned operations, mac80211
932 * will align the data.
d1c3a37c
JB		 933 *
934 * With A-MSDU frames, however, the payload data address must yield two modulo
935 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
936 * push the IP header further back to a multiple of four again. Thankfully, the
937 * specs were sane enough this time around to require padding each A-MSDU
938 * subframe to a length that is a multiple of four.
939 *
25985edc 940 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 941 * the payload is not supported, the driver is required to move the 802.11
942 * header to be directly in front of the payload in that case.
943 */
944static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 945{
59d9cb07 946#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 947 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 948#endif
6e0d114d
JB		 949}
950
6368e4b1 951
571ecf67
JB		 952/* rx handlers */
953
3cfcf6ac
JM		 954static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
955{
956 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
957
d8ca16db 958 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 959 return 0;
960
d8ca16db 961 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 962}
963
964
965static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
966{
967 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
968
d8ca16db 969 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 970 return 0;
971
d8ca16db 972 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 973}
974
975
976/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
977static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
978{
979 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
980 struct ieee80211_mmie *mmie;
56c52da2 981 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 982
1df332e8 983 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 984 return -1;
985
d8ca16db 986 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 987 return -1; /* not a robust management frame */
988
989 mmie = (struct ieee80211_mmie *)
990 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 991 if (mmie->element_id == WLAN_EID_MMIE &&
992 mmie->length == sizeof(*mmie) - 2)
993 return le16_to_cpu(mmie->key_id);
994
995 mmie16 = (struct ieee80211_mmie_16 *)
996 (skb->data + skb->len - sizeof(*mmie16));
997 if (skb->len >= 24 + sizeof(*mmie16) &&
998 mmie16->element_id == WLAN_EID_MMIE &&
999 mmie16->length == sizeof(*mmie16) - 2)
1000 return le16_to_cpu(mmie16->key_id);
1001
1002 return -1;
3cfcf6ac
JM		 1003}
1004
96fc6efb
AW		 1005static int ieee80211_get_keyid(struct sk_buff *skb,
1006 const struct ieee80211_cipher_scheme *cs)
2475b1cc
MS		 1007{
1008 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1009 __le16 fc;
1010 int hdrlen;
96fc6efb
AW		 1011 int minlen;
1012 u8 key_idx_off;
1013 u8 key_idx_shift;
2475b1cc
MS		 1014 u8 keyid;
1015
1016 fc = hdr->frame_control;
1017 hdrlen = ieee80211_hdrlen(fc);
1018
96fc6efb
AW		 1019 if (cs) {
1020 minlen = hdrlen + cs->hdr_len;
1021 key_idx_off = hdrlen + cs->key_idx_off;
1022 key_idx_shift = cs->key_idx_shift;
1023 } else {
1024 /* WEP, TKIP, CCMP and GCMP */
1025 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1026 key_idx_off = hdrlen + 3;
1027 key_idx_shift = 6;
1028 }
1029
1030 if (unlikely(skb->len < minlen))
2475b1cc
MS		 1031 return -EINVAL;
1032
96fc6efb
AW		 1033 skb_copy_bits(skb, key_idx_off, &keyid, 1);
1034
1035 if (cs)
1036 keyid &= cs->key_idx_mask;
1037 keyid >>= key_idx_shift;
1038
1039 /* cs could use more than the usual two bits for the keyid */
1040 if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1041 return -EINVAL;
2475b1cc
MS		 1042
1043 return keyid;
1044}
1045
1df332e8 1046static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 1047{
a7767f95 1048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 1049 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 1050
a7767f95 1051 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 1052 if (is_multicast_ether_addr(hdr->addr1)) {
1053 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 1054 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 1055 return RX_DROP_MONITOR;
b203ca39 1056 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 1057 return RX_DROP_MONITOR;
1058 } else {
1059 if (!ieee80211_has_a4(hdr->frame_control))
1060 return RX_DROP_MONITOR;
b203ca39 1061 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 1062 return RX_DROP_MONITOR;
1063 }
33b64eb2
LCC		 1064 }
1065
1066 /* If there is not an established peer link and this is not a peer link
1067 * establisment frame, beacon or probe, drop the frame.
1068 */
1069
57cf8043 1070 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 1071 struct ieee80211_mgmt *mgmt;
d6d1a5a7 1072
a7767f95 1073 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 1074 return RX_DROP_MONITOR;
1075
a7767f95 1076 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 1077 u8 category;
9b395bc3
JB		 1078
1079 /* make sure category field is present */
1080 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1081 return RX_DROP_MONITOR;
1082
33b64eb2 1083 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 1084 category = mgmt->u.action.category;
1085 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 1086 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 1087 return RX_DROP_MONITOR;
33b64eb2 1088 return RX_CONTINUE;
33b64eb2
LCC		 1089 }
1090
a7767f95
HH		 1091 if (ieee80211_is_probe_req(hdr->frame_control) ||
1092 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 1093 ieee80211_is_beacon(hdr->frame_control) ||
1094 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 1095 return RX_CONTINUE;
1096
1097 return RX_DROP_MONITOR;
a7767f95
HH		 1098 }
1099
902acc78
JB		 1100 return RX_CONTINUE;
1101}
33b64eb2 1102
fb4ea054
JB		 1103static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1104 int index)
1105{
1106 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1107 struct sk_buff *tail = skb_peek_tail(frames);
1108 struct ieee80211_rx_status *status;
1109
06470f74
SS		 1110 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1111 return true;
1112
fb4ea054
JB		 1113 if (!tail)
1114 return false;
1115
1116 status = IEEE80211_SKB_RXCB(tail);
1117 if (status->flag & RX_FLAG_AMSDU_MORE)
1118 return false;
1119
1120 return true;
1121}
1122
d3b2fb53 1123static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 1124 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1125 int index,
1126 struct sk_buff_head *frames)
1edfb1af 1127{
83eb935e
MK		 1128 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1129 struct sk_buff *skb;
4cfda47b 1130 struct ieee80211_rx_status *status;
1edfb1af 1131
dd318575
JB		 1132 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1133
83eb935e 1134 if (skb_queue_empty(skb_list))
1edfb1af
JB		 1135 goto no_frame;
1136
fb4ea054 1137 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
83eb935e
MK		 1138 __skb_queue_purge(skb_list);
1139 goto no_frame;
1140 }
1141
1142 /* release frames from the reorder ring buffer */
1edfb1af 1143 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 1144 while ((skb = __skb_dequeue(skb_list))) {
1145 status = IEEE80211_SKB_RXCB(skb);
1146 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1147 __skb_queue_tail(frames, skb);
1148 }
1edfb1af
JB		 1149
1150no_frame:
06470f74 1151 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
9a886586 1152 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 1153}
1154
d3b2fb53 1155static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 1156 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1157 u16 head_seq_num,
1158 struct sk_buff_head *frames)
1edfb1af
JB		 1159{
1160 int index;
1161
dd318575
JB		 1162 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1163
9a886586 1164 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 1165 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 1166 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1167 frames);
1edfb1af
JB		 1168 }
1169}
1170
1171/*
1172 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1173 * the skb was added to the buffer longer than this time ago, the earlier
1174 * frames that have not yet been received are assumed to be lost and the skb
1175 * can be released for processing. This may also release other skb's from the
1176 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 1177 *
1178 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 1179 */
1180#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1181
d3b2fb53 1182static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 1183 struct tid_ampdu_rx *tid_agg_rx,
1184 struct sk_buff_head *frames)
aa0c8636 1185{
83eb935e 1186 int index, i, j;
aa0c8636 1187
dd318575
JB		 1188 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1189
aa0c8636 1190 /* release the buffer until next missing frame */
2e3049b7 1191 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
fb4ea054 1192 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
07ae2dfc 1193 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 1194 /*
1195 * No buffers ready to be released, but check whether any
1196 * frames in the reorder buffer have timed out.
1197 */
aa0c8636
CL		 1198 int skipped = 1;
1199 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1200 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 1201 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
aa0c8636
CL		 1202 skipped++;
1203 continue;
1204 }
499fe9a4
DH		 1205 if (skipped &&
1206 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 1207 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 1208 goto set_release_timer;
aa0c8636 1209
83eb935e
MK		 1210 /* don't leave incomplete A-MSDUs around */
1211 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1212 i = (i + 1) % tid_agg_rx->buf_size)
1213 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1214
bdcbd8e0
JB		 1215 ht_dbg_ratelimited(sdata,
1216 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 1217 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1218 frames);
aa0c8636
CL		 1219
1220 /*
1221 * Increment the head seq# also for the skipped slots.
1222 */
1223 tid_agg_rx->head_seq_num =
9a886586
JB		 1224 (tid_agg_rx->head_seq_num +
1225 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 1226 skipped = 0;
1227 }
fb4ea054 1228 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
f9e124fb
CL		 1229 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1230 frames);
2e3049b7 1231 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 1232 }
2bff8ebf
CL		 1233
1234 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 1235 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 1236
1237 for (; j != (index - 1) % tid_agg_rx->buf_size;
1238 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 1239 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
2bff8ebf
CL		 1240 break;
1241 }
1242
1243 set_release_timer:
1244
788211d8
JB		 1245 if (!tid_agg_rx->removed)
1246 mod_timer(&tid_agg_rx->reorder_timer,
1247 tid_agg_rx->reorder_time[j] + 1 +
1248 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 1249 } else {
1250 del_timer(&tid_agg_rx->reorder_timer);
1251 }
aa0c8636
CL		 1252}
1253
1edfb1af
JB		 1254/*
1255 * As this function belongs to the RX path it must be under
1256 * rcu_read_lock protection. It returns false if the frame
1257 * can be processed immediately, true if it was consumed.
1258 */
d3b2fb53 1259static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 1260 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1261 struct sk_buff *skb,
1262 struct sk_buff_head *frames)
1edfb1af
JB		 1263{
1264 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 1265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 1266 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1267 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1268 u16 head_seq_num, buf_size;
1269 int index;
2bff8ebf 1270 bool ret = true;
1edfb1af 1271
dd318575
JB		 1272 spin_lock(&tid_agg_rx->reorder_lock);
1273
4549cf2b
MK		 1274 /*
1275 * Offloaded BA sessions have no known starting sequence number so pick
1276 * one from first Rxed frame for this tid after BA was started.
1277 */
1278 if (unlikely(tid_agg_rx->auto_seq)) {
1279 tid_agg_rx->auto_seq = false;
1280 tid_agg_rx->ssn = mpdu_seq_num;
1281 tid_agg_rx->head_seq_num = mpdu_seq_num;
1282 }
1283
1edfb1af
JB		 1284 buf_size = tid_agg_rx->buf_size;
1285 head_seq_num = tid_agg_rx->head_seq_num;
1286
b7540d8f
SS		 1287 /*
1288 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1289 * be reordered.
1290 */
1291 if (unlikely(!tid_agg_rx->started)) {
1292 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1293 ret = false;
1294 goto out;
1295 }
1296 tid_agg_rx->started = true;
1297 }
1298
1edfb1af 1299 /* frame with out of date sequence number */
9a886586 1300 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 1301 dev_kfree_skb(skb);
2bff8ebf 1302 goto out;
1edfb1af
JB		 1303 }
1304
1305 /*
1306 * If frame the sequence number exceeds our buffering window
1307 * size release some previous frames to make room for this one.
1308 */
9a886586
JB		 1309 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1310 head_seq_num = ieee80211_sn_inc(
1311 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 1312 /* release stored frames up to new head to stack */
d3b2fb53 1313 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 1314 head_seq_num, frames);
1edfb1af
JB		 1315 }
1316
1317 /* Now the new frame is always in the range of the reordering buffer */
1318
2e3049b7 1319 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 1320
1321 /* check if we already stored this frame */
fb4ea054 1322 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1edfb1af 1323 dev_kfree_skb(skb);
2bff8ebf 1324 goto out;
1edfb1af
JB		 1325 }
1326
1327 /*
1328 * If the current MPDU is in the right order and nothing else
1329 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 1330 * If it is first but there's something stored, we may be able
1331 * to release frames after this one.
1edfb1af
JB		 1332 */
1333 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1334 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1335 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1336 tid_agg_rx->head_seq_num =
1337 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1338 ret = false;
1339 goto out;
1edfb1af
JB		 1340 }
1341
1342 /* put the frame in the reordering buffer */
83eb935e
MK		 1343 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1344 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1345 tid_agg_rx->reorder_time[index] = jiffies;
1346 tid_agg_rx->stored_mpdu_num++;
1347 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1348 }
1edfb1af 1349
2bff8ebf
CL		 1350 out:
1351 spin_unlock(&tid_agg_rx->reorder_lock);
1352 return ret;
1edfb1af
JB		 1353}
1354
1355/*
1356 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1357 * true if the MPDU was buffered, false if it should be processed.
1358 */
f9e124fb
CL		 1359static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1360 struct sk_buff_head *frames)
1edfb1af 1361{
2569a826
JB		 1362 struct sk_buff *skb = rx->skb;
1363 struct ieee80211_local *local = rx->local;
1edfb1af 1364 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1365 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1366 struct tid_ampdu_rx *tid_agg_rx;
1367 u16 sc;
6cc00d54 1368 u8 tid, ack_policy;
1edfb1af 1369
051a41fa
JB		 1370 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1371 is_multicast_ether_addr(hdr->addr1))
2569a826 1372 goto dont_reorder;
1edfb1af
JB		 1373
1374 /*
1375 * filter the QoS data rx stream according to
1376 * STA/TID and check if this STA/TID is on aggregation
1377 */
1378
1edfb1af 1379 if (!sta)
2569a826 1380 goto dont_reorder;
1edfb1af 1381
6cc00d54
TP		 1382 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1383 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
a1f2ba04 1384 tid = ieee80211_get_tid(hdr);
1edfb1af 1385
a87f736d 1386 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
bfe40fa3
JB		 1387 if (!tid_agg_rx) {
1388 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1389 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1390 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1391 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1392 WLAN_BACK_RECIPIENT,
1393 WLAN_REASON_QSTA_REQUIRE_SETUP);
a87f736d 1394 goto dont_reorder;
bfe40fa3 1395 }
1edfb1af
JB		 1396
1397 /* qos null data frames are excluded */
1398 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1399 goto dont_reorder;
1edfb1af 1400
6cc00d54
TP		 1401 /* not part of a BA session */
1402 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1403 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1404 goto dont_reorder;
1405
1edfb1af
JB		 1406 /* new, potentially un-ordered, ampdu frame - process it */
1407
1408 /* reset session timer */
1409 if (tid_agg_rx->timeout)
12d3952f 1410 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1411
1412 /* if this mpdu is fragmented - terminate rx aggregation session */
1413 sc = le16_to_cpu(hdr->seq_ctrl);
1414 if (sc & IEEE80211_SCTL_FRAG) {
344eec67
JB		 1415 skb_queue_tail(&rx->sdata->skb_queue, skb);
1416 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1417 return;
1edfb1af
JB		 1418 }
1419
a87f736d
JB		 1420 /*
1421 * No locking needed -- we will only ever process one
1422 * RX packet at a time, and thus own tid_agg_rx. All
1423 * other code manipulating it needs to (and does) make
1424 * sure that we cannot get to it any more before doing
1425 * anything with it.
1426 */
f9e124fb
CL		 1427 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1428 frames))
2569a826
JB		 1429 return;
1430
1431 dont_reorder:
f9e124fb 1432 __skb_queue_tail(frames, skb);
1edfb1af 1433}
33b64eb2 1434
49461622 1435static ieee80211_rx_result debug_noinline
0395442a 1436ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1437{
a7767f95 1438 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1439 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1440
f9cfa5f3
SS		 1441 if (status->flag & RX_FLAG_DUP_VALIDATED)
1442 return RX_CONTINUE;
1443
6b0f3274
JB		 1444 /*
1445 * Drop duplicate 802.11 retransmissions
1446 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1447 */
0395442a
JB		 1448
1449 if (rx->skb->len < 24)
1450 return RX_CONTINUE;
1451
1452 if (ieee80211_is_ctl(hdr->frame_control) ||
990d7184 1453 ieee80211_is_nullfunc(hdr->frame_control) ||
0395442a
JB		 1454 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1455 is_multicast_ether_addr(hdr->addr1))
1456 return RX_CONTINUE;
1457
a732fa70
JB		 1458 if (!rx->sta)
1459 return RX_CONTINUE;
1460
1461 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1462 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1463 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1464 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1465 return RX_DROP_UNUSABLE;
1466 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1467 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1468 }
1469
0395442a
JB		 1470 return RX_CONTINUE;
1471}
1472
1473static ieee80211_rx_result debug_noinline
1474ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1475{
1476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1477
571ecf67
JB		 1478 /* Drop disallowed frame classes based on STA auth/assoc state;
1479 * IEEE 802.11, Chap 5.5.
1480 *
ccd7b362
JB		 1481 * mac80211 filters only based on association state, i.e. it drops
1482 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1483 * deauth/disassoc frames when needed. In addition, hostapd is
1484 * responsible for filtering on both auth and assoc states.
1485 */
33b64eb2 1486
902acc78 1487 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1488 return ieee80211_rx_mesh_check(rx);
33b64eb2 1489
a7767f95
HH		 1490 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1491 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1492 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1493 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1494 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1495 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1496 /*
1497 * accept port control frames from the AP even when it's not
1498 * yet marked ASSOC to prevent a race where we don't set the
1499 * assoc bit quickly enough before it sends the first frame
1500 */
1501 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1502 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1503 unsigned int hdrlen;
1504 __be16 ethertype;
1505
1506 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1507
1508 if (rx->skb->len < hdrlen + 8)
1509 return RX_DROP_MONITOR;
1510
1511 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1512 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1513 return RX_CONTINUE;
1514 }
21fc7560
JB		 1515
1516 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1517 cfg80211_rx_spurious_frame(rx->sdata->dev,
1518 hdr->addr2,
1519 GFP_ATOMIC))
1520 return RX_DROP_UNUSABLE;
1521
e4c26add 1522 return RX_DROP_MONITOR;
2a33bee2 1523 }
571ecf67 1524
9ae54c84 1525 return RX_CONTINUE;
570bd537
JB		 1526}
1527
1528
572e0012
KV		 1529static ieee80211_rx_result debug_noinline
1530ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1531{
1532 struct ieee80211_local *local;
1533 struct ieee80211_hdr *hdr;
1534 struct sk_buff *skb;
1535
1536 local = rx->local;
1537 skb = rx->skb;
1538 hdr = (struct ieee80211_hdr *) skb->data;
1539
1540 if (!local->pspolling)
1541 return RX_CONTINUE;
1542
1543 if (!ieee80211_has_fromds(hdr->frame_control))
1544 /* this is not from AP */
1545 return RX_CONTINUE;
1546
1547 if (!ieee80211_is_data(hdr->frame_control))
1548 return RX_CONTINUE;
1549
1550 if (!ieee80211_has_moredata(hdr->frame_control)) {
1551 /* AP has no more frames buffered for us */
1552 local->pspolling = false;
1553 return RX_CONTINUE;
1554 }
1555
1556 /* more data bit is set, let's request a new frame from the AP */
1557 ieee80211_send_pspoll(local, rx->sdata);
1558
1559 return RX_CONTINUE;
1560}
1561
d012a605 1562static void sta_ps_start(struct sta_info *sta)
571ecf67 1563{
133b8226 1564 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1565 struct ieee80211_local *local = sdata->local;
d012a605 1566 struct ps_data *ps;
ba8c3d6f 1567 int tid;
0795af57 1568
d012a605
MP		 1569 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1570 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1571 ps = &sdata->bss->ps;
1572 else
1573 return;
1574
1575 atomic_inc(&ps->num_sta_ps);
c2c98fde 1576 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1577 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1578 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1579 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1580 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1581
17c18bf8
JB		 1582 ieee80211_clear_fast_xmit(sta);
1583
ba8c3d6f
FF		 1584 if (!sta->sta.txq[0])
1585 return;
1586
adf8ed01 1587 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
b49c15e1
FF		 1588 struct ieee80211_txq *txq = sta->sta.txq[tid];
1589 struct txq_info *txqi = to_txq_info(txq);
1590
1591 spin_lock(&local->active_txq_lock[txq->ac]);
1592 if (!list_empty(&txqi->schedule_order))
1593 list_del_init(&txqi->schedule_order);
1594 spin_unlock(&local->active_txq_lock[txq->ac]);
1595
1596 if (txq_has_queue(txq))
ba8c3d6f
FF		 1597 set_bit(tid, &sta->txq_buffered_tids);
1598 else
1599 clear_bit(tid, &sta->txq_buffered_tids);
1600 }
571ecf67
JB		 1601}
1602
d012a605 1603static void sta_ps_end(struct sta_info *sta)
571ecf67 1604{
bdcbd8e0
JB		 1605 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1606 sta->sta.addr, sta->sta.aid);
004c872e 1607
c2c98fde 1608 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1609 /*
1610 * Clear the flag only if the other one is still set
1611 * so that the TX path won't start TX'ing new frames
1612 * directly ... In the case that the driver flag isn't
1613 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1614 */
1615 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1616 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1617 sta->sta.addr, sta->sta.aid);
af818581
JB		 1618 return;
1619 }
1620
5ac2e350
JB		 1621 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1622 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1623 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1624}
1625
cf47161a 1626int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1627{
cf47161a 1628 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1629 bool in_ps;
1630
cf47161a 1631 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1632
1633 /* Don't let the same PS state be set twice */
cf47161a 1634 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1635 if ((start && in_ps) || (!start && !in_ps))
1636 return -EINVAL;
1637
1638 if (start)
cf47161a 1639 sta_ps_start(sta);
d057e5a3 1640 else
cf47161a 1641 sta_ps_end(sta);
d057e5a3
AN		 1642
1643 return 0;
1644}
1645EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1646
46fa38e8
JB		 1647void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1648{
1649 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1650
1651 if (test_sta_flag(sta, WLAN_STA_SP))
1652 return;
1653
1654 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1655 ieee80211_sta_ps_deliver_poll_response(sta);
1656 else
1657 set_sta_flag(sta, WLAN_STA_PSPOLL);
1658}
1659EXPORT_SYMBOL(ieee80211_sta_pspoll);
1660
1661void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1662{
1663 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
731977e9 1664 int ac = ieee80211_ac_from_tid(tid);
46fa38e8
JB		 1665
1666 /*
0aa419ec
EG		 1667 * If this AC is not trigger-enabled do nothing unless the
1668 * driver is calling us after it already checked.
46fa38e8
JB		 1669 *
1670 * NB: This could/should check a separate bitmap of trigger-
1671 * enabled queues, but for now we only implement uAPSD w/o
1672 * TSPEC changes to the ACs, so they're always the same.
1673 */
f438ceb8
EG		 1674 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1675 tid != IEEE80211_NUM_TIDS)
46fa38e8
JB		 1676 return;
1677
1678 /* if we are in a service period, do nothing */
1679 if (test_sta_flag(sta, WLAN_STA_SP))
1680 return;
1681
1682 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1683 ieee80211_sta_ps_deliver_uapsd(sta);
1684 else
1685 set_sta_flag(sta, WLAN_STA_UAPSD);
1686}
1687EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1688
47086fc5
JB		 1689static ieee80211_rx_result debug_noinline
1690ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1691{
1692 struct ieee80211_sub_if_data *sdata = rx->sdata;
1693 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1694 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
47086fc5 1695
5c90067c 1696 if (!rx->sta)
47086fc5
JB		 1697 return RX_CONTINUE;
1698
1699 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1700 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1701 return RX_CONTINUE;
1702
1703 /*
1704 * The device handles station powersave, so don't do anything about
1705 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1706 * it to mac80211 since they're handled.)
1707 */
30686bf7 1708 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1709 return RX_CONTINUE;
1710
1711 /*
1712 * Don't do anything if the station isn't already asleep. In
1713 * the uAPSD case, the station will probably be marked asleep,
1714 * in the PS-Poll case the station must be confused ...
1715 */
c2c98fde 1716 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1717 return RX_CONTINUE;
1718
1719 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
46fa38e8 1720 ieee80211_sta_pspoll(&rx->sta->sta);
47086fc5
JB		 1721
1722 /* Free PS Poll skb here instead of returning RX_DROP that would
1723 * count as an dropped frame. */
1724 dev_kfree_skb(rx->skb);
1725
1726 return RX_QUEUED;
1727 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1728 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1729 ieee80211_has_pm(hdr->frame_control) &&
1730 (ieee80211_is_data_qos(hdr->frame_control) ||
1731 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
a1f2ba04 1732 u8 tid = ieee80211_get_tid(hdr);
47086fc5 1733
46fa38e8 1734 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
47086fc5
JB		 1735 }
1736
1737 return RX_CONTINUE;
1738}
1739
49461622 1740static ieee80211_rx_result debug_noinline
5cf121c3 1741ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1742{
1743 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1744 struct sk_buff *skb = rx->skb;
1745 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1747 int i;
571ecf67
JB		 1748
1749 if (!sta)
9ae54c84 1750 return RX_CONTINUE;
571ecf67 1751
b291ba11
JB		 1752 /*
1753 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1754 * BSSID and for station already AUTHORIZED to avoid keeping the
1755 * current IBSS network alive in cases where other STAs start
1756 * using different BSSID. This will also give the station another
1757 * chance to restart the authentication/authorization in case
1758 * something went wrong the first time.
b291ba11 1759 */
05c914fe 1760 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1761 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1762 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1763 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1764 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1765 sta->rx_stats.last_rx = jiffies;
f4ebddf9 1766 if (ieee80211_is_data(hdr->frame_control) &&
4f6b1b3d
JB		 1767 !is_multicast_ether_addr(hdr->addr1))
1768 sta->rx_stats.last_rate =
1769 sta_stats_encode_rate(status);
3af6334c 1770 }
239281f8 1771 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1772 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1773 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1774 /*
33b64eb2
LCC		 1775 * Mesh beacons will update last_rx when if they are found to
1776 * match the current local configuration when processed.
571ecf67 1777 */
e5a9f8d0 1778 sta->rx_stats.last_rx = jiffies;
4f6b1b3d
JB		 1779 if (ieee80211_is_data(hdr->frame_control))
1780 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
571ecf67
JB		 1781 }
1782
3cf335d5
KV		 1783 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1784 ieee80211_sta_rx_notify(rx->sdata, hdr);
1785
e5a9f8d0 1786 sta->rx_stats.fragments++;
0f9c5a61
JB		 1787
1788 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
e5a9f8d0 1789 sta->rx_stats.bytes += rx->skb->len;
0f9c5a61
JB		 1790 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1791
fe8431f8 1792 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0 1793 sta->rx_stats.last_signal = status->signal;
0be6ed13 1794 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
fe8431f8 1795 }
571ecf67 1796
ef0621e8 1797 if (status->chains) {
e5a9f8d0 1798 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1799 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1800 int signal = status->chain_signal[i];
1801
1802 if (!(status->chains & BIT(i)))
1803 continue;
1804
e5a9f8d0 1805 sta->rx_stats.chain_signal_last[i] = signal;
0be6ed13 1806 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
e5a9f8d0 1807 -signal);
ef0621e8
FF		 1808 }
1809 }
1810
72eaa43a
JB		 1811 /*
1812 * Change STA power saving mode only at the end of a frame
9fef6544
EG		 1813 * exchange sequence, and only for a data or management
1814 * frame as specified in IEEE 802.11-2016 11.2.3.2
72eaa43a 1815 */
30686bf7 1816 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1817 !ieee80211_has_morefrags(hdr->frame_control) &&
20932750 1818 !is_multicast_ether_addr(hdr->addr1) &&
9fef6544
EG		 1819 (ieee80211_is_mgmt(hdr->frame_control) ||
1820 ieee80211_is_data(hdr->frame_control)) &&
4cfda47b 1821 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1822 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
9fef6544 1823 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1824 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1825 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1826 sta_ps_end(sta);
72eaa43a
JB		 1827 } else {
1828 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1829 sta_ps_start(sta);
72eaa43a 1830 }
571ecf67
JB		 1831 }
1832
3f52b7e3
MP		 1833 /* mesh power save support */
1834 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1835 ieee80211_mps_rx_h_sta_process(sta, hdr);
1836
22403def
JB		 1837 /*
1838 * Drop (qos-)data::nullfunc frames silently, since they
1839 * are used only to control station power saving mode.
1840 */
1841 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1842 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1843 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1844
1845 /*
1846 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1847 * that was not moved to a 4-addr STA vlan yet send
1848 * the event to userspace and for older hostapd drop
1849 * the frame to the monitor interface.
d524215f
FF		 1850 */
1851 if (ieee80211_has_a4(hdr->frame_control) &&
1852 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1853 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1854 !rx->sdata->u.vlan.sta))) {
1855 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1856 cfg80211_rx_unexpected_4addr_frame(
1857 rx->sdata->dev, sta->sta.addr,
1858 GFP_ATOMIC);
d524215f 1859 return RX_DROP_MONITOR;
e7f4a940 1860 }
22403def
JB		 1861 /*
1862 * Update counter and free packet here to avoid
1863 * counting this as a dropped packed.
1864 */
e5a9f8d0 1865 sta->rx_stats.packets++;
571ecf67 1866 dev_kfree_skb(rx->skb);
9ae54c84 1867 return RX_QUEUED;
571ecf67
JB		 1868 }
1869
9ae54c84 1870 return RX_CONTINUE;
571ecf67
JB		 1871} /* ieee80211_rx_h_sta_process */
1872
86c228a7
JA		 1873static ieee80211_rx_result debug_noinline
1874ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1875{
1876 struct sk_buff *skb = rx->skb;
1877 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1878 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1879 int keyidx;
86c228a7
JA		 1880 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1881 struct ieee80211_key *sta_ptk = NULL;
96fc6efb 1882 struct ieee80211_key *ptk_idx = NULL;
86c228a7
JA		 1883 int mmie_keyidx = -1;
1884 __le16 fc;
2475b1cc 1885 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1886
1887 /*
1888 * Key selection 101
1889 *
1890 * There are four types of keys:
1891 * - GTK (group keys)
1892 * - IGTK (group keys for management frames)
1893 * - PTK (pairwise keys)
1894 * - STK (station-to-station pairwise keys)
1895 *
1896 * When selecting a key, we have to distinguish between multicast
1897 * (including broadcast) and unicast frames, the latter can only
1898 * use PTKs and STKs while the former always use GTKs and IGTKs.
1899 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1900 * unicast frames can also use key indices like GTKs. Hence, if we
1901 * don't have a PTK/STK we check the key index for a WEP key.
1902 *
1903 * Note that in a regular BSS, multicast frames are sent by the
1904 * AP only, associated stations unicast the frame to the AP first
1905 * which then multicasts it on their behalf.
1906 *
1907 * There is also a slight problem in IBSS mode: GTKs are negotiated
1908 * with each station, that is something we don't currently handle.
1909 * The spec seems to expect that one negotiates the same key with
1910 * every station but there's no such requirement; VLANs could be
1911 * possible.
1912 */
1913
86c228a7
JA		 1914 /* start without a key */
1915 rx->key = NULL;
2475b1cc 1916 fc = hdr->frame_control;
86c228a7 1917
2475b1cc
MS		 1918 if (rx->sta) {
1919 int keyid = rx->sta->ptk_idx;
96fc6efb 1920 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
86c228a7 1921
96fc6efb 1922 if (ieee80211_has_protected(fc)) {
2475b1cc 1923 cs = rx->sta->cipher_scheme;
96fc6efb
AW		 1924 keyid = ieee80211_get_keyid(rx->skb, cs);
1925
2475b1cc
MS		 1926 if (unlikely(keyid < 0))
1927 return RX_DROP_UNUSABLE;
96fc6efb
AW		 1928
1929 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
2475b1cc 1930 }
2475b1cc 1931 }
86c228a7
JA		 1932
1933 if (!ieee80211_has_protected(fc))
1934 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1935
1936 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
96fc6efb 1937 rx->key = ptk_idx ? ptk_idx : sta_ptk;
86c228a7
JA		 1938 if ((status->flag & RX_FLAG_DECRYPTED) &&
1939 (status->flag & RX_FLAG_IV_STRIPPED))
1940 return RX_CONTINUE;
1941 /* Skip decryption if the frame is not protected. */
1942 if (!ieee80211_has_protected(fc))
1943 return RX_CONTINUE;
1944 } else if (mmie_keyidx >= 0) {
1945 /* Broadcast/multicast robust management frame / BIP */
1946 if ((status->flag & RX_FLAG_DECRYPTED) &&
1947 (status->flag & RX_FLAG_IV_STRIPPED))
1948 return RX_CONTINUE;
1949
1950 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1951 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1952 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
46f6b060
MH		 1953 if (rx->sta) {
1954 if (ieee80211_is_group_privacy_action(skb) &&
1955 test_sta_flag(rx->sta, WLAN_STA_MFP))
1956 return RX_DROP_MONITOR;
1957
86c228a7 1958 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
46f6b060 1959 }
86c228a7
JA		 1960 if (!rx->key)
1961 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1962 } else if (!ieee80211_has_protected(fc)) {
1963 /*
1964 * The frame was not protected, so skip decryption. However, we
1965 * need to set rx->key if there is a key that could have been
1966 * used so that the frame may be dropped if encryption would
1967 * have been expected.
1968 */
1969 struct ieee80211_key *key = NULL;
1970 struct ieee80211_sub_if_data *sdata = rx->sdata;
1971 int i;
1972
1973 if (ieee80211_is_mgmt(fc) &&
1974 is_multicast_ether_addr(hdr->addr1) &&
1975 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1976 rx->key = key;
1977 else {
1978 if (rx->sta) {
1979 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1980 key = rcu_dereference(rx->sta->gtk[i]);
1981 if (key)
1982 break;
1983 }
1984 }
1985 if (!key) {
1986 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1987 key = rcu_dereference(sdata->keys[i]);
1988 if (key)
1989 break;
1990 }
1991 }
1992 if (key)
1993 rx->key = key;
1994 }
1995 return RX_CONTINUE;
1996 } else {
86c228a7
JA		 1997 /*
1998 * The device doesn't give us the IV so we won't be
1999 * able to look up the key. That's ok though, we
2000 * don't need to decrypt the frame, we just won't
2001 * be able to keep statistics accurate.
2002 * Except for key threshold notifications, should
2003 * we somehow allow the driver to tell us which key
2004 * the hardware used if this flag is set?
2005 */
2006 if ((status->flag & RX_FLAG_DECRYPTED) &&
2007 (status->flag & RX_FLAG_IV_STRIPPED))
2008 return RX_CONTINUE;
2009
96fc6efb 2010 keyidx = ieee80211_get_keyid(rx->skb, cs);
86c228a7 2011
96fc6efb
AW		 2012 if (unlikely(keyidx < 0))
2013 return RX_DROP_UNUSABLE;
86c228a7
JA		 2014
2015 /* check per-station GTK first, if multicast packet */
2016 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2017 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2018
2019 /* if not found, try default key */
2020 if (!rx->key) {
2021 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2022
2023 /*
2024 * RSNA-protected unicast frames should always be
2025 * sent with pairwise or station-to-station keys,
2026 * but for WEP we allow using a key index as well.
2027 */
2028 if (rx->key &&
2029 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2030 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2031 !is_multicast_ether_addr(hdr->addr1))
2032 rx->key = NULL;
2033 }
2034 }
2035
2036 if (rx->key) {
2037 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2038 return RX_DROP_MONITOR;
2039
86c228a7
JA		 2040 /* TODO: add threshold stuff again */
2041 } else {
2042 return RX_DROP_MONITOR;
2043 }
2044
2045 switch (rx->key->conf.cipher) {
2046 case WLAN_CIPHER_SUITE_WEP40:
2047 case WLAN_CIPHER_SUITE_WEP104:
2048 result = ieee80211_crypto_wep_decrypt(rx);
2049 break;
2050 case WLAN_CIPHER_SUITE_TKIP:
2051 result = ieee80211_crypto_tkip_decrypt(rx);
2052 break;
2053 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 2054 result = ieee80211_crypto_ccmp_decrypt(
2055 rx, IEEE80211_CCMP_MIC_LEN);
2056 break;
2057 case WLAN_CIPHER_SUITE_CCMP_256:
2058 result = ieee80211_crypto_ccmp_decrypt(
2059 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 2060 break;
2061 case WLAN_CIPHER_SUITE_AES_CMAC:
2062 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2063 break;
56c52da2
JM		 2064 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2065 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2066 break;
8ade538b
JM		 2067 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2068 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2069 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2070 break;
00b9cfa3
JM		 2071 case WLAN_CIPHER_SUITE_GCMP:
2072 case WLAN_CIPHER_SUITE_GCMP_256:
2073 result = ieee80211_crypto_gcmp_decrypt(rx);
2074 break;
86c228a7 2075 default:
2475b1cc 2076 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 2077 }
2078
2079 /* the hdr variable is invalid after the decrypt handlers */
2080
2081 /* either the frame has been decrypted or will be dropped */
2082 status->flag |= RX_FLAG_DECRYPTED;
2083
2084 return result;
2085}
2086
571ecf67
JB		 2087static inline struct ieee80211_fragment_entry *
2088ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2089 unsigned int frag, unsigned int seq, int rx_queue,
2090 struct sk_buff **skb)
2091{
2092 struct ieee80211_fragment_entry *entry;
571ecf67 2093
571ecf67
JB		 2094 entry = &sdata->fragments[sdata->fragment_next++];
2095 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2096 sdata->fragment_next = 0;
2097
bdcbd8e0 2098 if (!skb_queue_empty(&entry->skb_list))
571ecf67 2099 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 2100
2101 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2102 *skb = NULL;
2103 entry->first_frag_time = jiffies;
2104 entry->seq = seq;
2105 entry->rx_queue = rx_queue;
2106 entry->last_frag = frag;
9acc54be 2107 entry->check_sequential_pn = false;
571ecf67
JB		 2108 entry->extra_len = 0;
2109
2110 return entry;
2111}
2112
2113static inline struct ieee80211_fragment_entry *
2114ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 2115 unsigned int frag, unsigned int seq,
571ecf67
JB		 2116 int rx_queue, struct ieee80211_hdr *hdr)
2117{
2118 struct ieee80211_fragment_entry *entry;
2119 int i, idx;
2120
2121 idx = sdata->fragment_next;
2122 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2123 struct ieee80211_hdr *f_hdr;
7957a9de 2124 struct sk_buff *f_skb;
571ecf67
JB		 2125
2126 idx--;
2127 if (idx < 0)
2128 idx = IEEE80211_FRAGMENT_MAX - 1;
2129
2130 entry = &sdata->fragments[idx];
2131 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2132 entry->rx_queue != rx_queue ||
2133 entry->last_frag + 1 != frag)
2134 continue;
2135
7957a9de
DM		 2136 f_skb = __skb_peek(&entry->skb_list);
2137 f_hdr = (struct ieee80211_hdr *) f_skb->data;
571ecf67 2138
b73d70ad
HH		 2139 /*
2140 * Check ftype and addresses are equal, else check next fragment
2141 */
2142 if (((hdr->frame_control ^ f_hdr->frame_control) &
2143 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 2144 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2145 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 2146 continue;
2147
ab46623e 2148 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 2149 __skb_queue_purge(&entry->skb_list);
2150 continue;
2151 }
2152 return entry;
2153 }
2154
2155 return NULL;
2156}
2157
49461622 2158static ieee80211_rx_result debug_noinline
5cf121c3 2159ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 2160{
2161 struct ieee80211_hdr *hdr;
2162 u16 sc;
358c8d9d 2163 __le16 fc;
571ecf67
JB		 2164 unsigned int frag, seq;
2165 struct ieee80211_fragment_entry *entry;
2166 struct sk_buff *skb;
2167
b73d70ad 2168 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 2169 fc = hdr->frame_control;
f7fbf70e
JC		 2170
2171 if (ieee80211_is_ctl(fc))
2172 return RX_CONTINUE;
2173
571ecf67
JB		 2174 sc = le16_to_cpu(hdr->seq_ctrl);
2175 frag = sc & IEEE80211_SCTL_FRAG;
2176
b8fff407 2177 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 2178 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 2179 goto out_no_led;
571ecf67 2180 }
b8fff407 2181
d025933e
AM		 2182 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2183 goto out;
2184
571ecf67
JB		 2185 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2186
e3cf8b3f
ZY		 2187 if (skb_linearize(rx->skb))
2188 return RX_DROP_UNUSABLE;
2189
058897a4
AK		 2190 /*
2191 * skb_linearize() might change the skb->data and
2192 * previously cached variables (in this case, hdr) need to
2193 * be refreshed with the new data.
2194 */
2195 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 2196 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2197
2198 if (frag == 0) {
2199 /* This is the first fragment of a new frame. */
2200 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 2201 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 2202 if (rx->key &&
2203 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
9acc54be
JB		 2204 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2205 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2206 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
358c8d9d 2207 ieee80211_has_protected(fc)) {
9e26297a 2208 int queue = rx->security_idx;
9acc54be
JB		 2209
2210 /* Store CCMP/GCMP PN so that we can verify that the
2211 * next fragment has a sequential PN value.
2212 */
2213 entry->check_sequential_pn = true;
571ecf67 2214 memcpy(entry->last_pn,
9190252c 2215 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 2216 IEEE80211_CCMP_PN_LEN);
9acc54be
JB		 2217 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2218 u.ccmp.rx_pn) !=
2219 offsetof(struct ieee80211_key,
2220 u.gcmp.rx_pn));
2221 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2222 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2223 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2224 IEEE80211_GCMP_PN_LEN);
571ecf67 2225 }
9ae54c84 2226 return RX_QUEUED;
571ecf67
JB		 2227 }
2228
2229 /* This is a fragment for a frame that should already be pending in
2230 * fragment cache. Add this fragment to the end of the pending entry.
2231 */
9e26297a
JB		 2232 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2233 rx->seqno_idx, hdr);
571ecf67
JB		 2234 if (!entry) {
2235 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 2236 return RX_DROP_MONITOR;
571ecf67
JB		 2237 }
2238
9acc54be
JB		 2239 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2240 * MPDU PN values are not incrementing in steps of 1."
2241 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2242 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2243 */
2244 if (entry->check_sequential_pn) {
571ecf67 2245 int i;
4325f6ca 2246 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 2247 int queue;
9acc54be 2248
2b2ba0db
JM		 2249 if (!rx->key ||
2250 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
9acc54be
JB		 2251 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2252 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2253 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
e4c26add 2254 return RX_DROP_UNUSABLE;
4325f6ca
JB		 2255 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2256 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 2257 pn[i]++;
2258 if (pn[i])
2259 break;
2260 }
9e26297a 2261 queue = rx->security_idx;
9190252c 2262 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 2263 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 2264 return RX_DROP_UNUSABLE;
4325f6ca 2265 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 2266 }
2267
358c8d9d 2268 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 2269 __skb_queue_tail(&entry->skb_list, rx->skb);
2270 entry->last_frag = frag;
2271 entry->extra_len += rx->skb->len;
358c8d9d 2272 if (ieee80211_has_morefrags(fc)) {
571ecf67 2273 rx->skb = NULL;
9ae54c84 2274 return RX_QUEUED;
571ecf67
JB		 2275 }
2276
2277 rx->skb = __skb_dequeue(&entry->skb_list);
2278 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 2279 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 2280 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2281 GFP_ATOMIC))) {
2282 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2283 __skb_queue_purge(&entry->skb_list);
e4c26add 2284 return RX_DROP_UNUSABLE;
571ecf67
JB		 2285 }
2286 }
2287 while ((skb = __skb_dequeue(&entry->skb_list))) {
59ae1d12 2288 skb_put_data(rx->skb, skb->data, skb->len);
571ecf67
JB		 2289 dev_kfree_skb(skb);
2290 }
2291
571ecf67 2292 out:
d025933e
AM		 2293 ieee80211_led_rx(rx->local);
2294 out_no_led:
571ecf67 2295 if (rx->sta)
e5a9f8d0 2296 rx->sta->rx_stats.packets++;
9ae54c84 2297 return RX_CONTINUE;
571ecf67
JB		 2298}
2299
1df332e8 2300static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 2301{
1df332e8 2302 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 2303 return -EACCES;
571ecf67 2304
76ee65bf 2305 return 0;
571ecf67
JB		 2306}
2307
1df332e8 2308static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 2309{
eb9fb5b8
JB		 2310 struct sk_buff *skb = rx->skb;
2311 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2312
3017b80b 2313 /*
7848ba7d
JB		 2314 * Pass through unencrypted frames if the hardware has
2315 * decrypted them already.
3017b80b 2316 */
eb9fb5b8 2317 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 2318 return 0;
571ecf67
JB		 2319
2320 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 2321 if (unlikely(!ieee80211_has_protected(fc) &&
2322 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 2323 ieee80211_is_data(fc) && rx->key))
76ee65bf 2324 return -EACCES;
bef5d1c7
JB		 2325
2326 return 0;
2327}
2328
1df332e8 2329static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 2330{
2331 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 2332 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 2333 __le16 fc = hdr->frame_control;
bef5d1c7 2334
e3efca0a
JM		 2335 /*
2336 * Pass through unencrypted frames if the hardware has
2337 * decrypted them already.
2338 */
2339 if (status->flag & RX_FLAG_DECRYPTED)
2340 return 0;
bef5d1c7 2341
c2c98fde 2342 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 2343 if (unlikely(!ieee80211_has_protected(fc) &&
2344 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2345 rx->key)) {
6ff57cf8
JB		 2346 if (ieee80211_is_deauth(fc) ||
2347 ieee80211_is_disassoc(fc))
2348 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2349 rx->skb->data,
2350 rx->skb->len);
f2ca3ea4 2351 return -EACCES;
cf4e594e 2352 }
f2ca3ea4 2353 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2354 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2355 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2356 if (ieee80211_is_deauth(fc) ||
2357 ieee80211_is_disassoc(fc))
2358 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2359 rx->skb->data,
2360 rx->skb->len);
f2ca3ea4 2361 return -EACCES;
cf4e594e 2362 }
f2ca3ea4
JM		 2363 /*
2364 * When using MFP, Action frames are not allowed prior to
2365 * having configured keys.
2366 */
2367 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2368 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2369 return -EACCES;
2370 }
b3fc9c6c 2371
76ee65bf 2372 return 0;
571ecf67
JB		 2373}
2374
76ee65bf 2375static int
4114fa21 2376__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2377{
eb9fb5b8 2378 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2380 bool check_port_control = false;
2381 struct ethhdr *ehdr;
2382 int ret;
f14543ee 2383
4114fa21 2384 *port_control = false;
9bc383de
JB		 2385 if (ieee80211_has_a4(hdr->frame_control) &&
2386 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2387 return -1;
9bc383de 2388
fbb327c5
FF		 2389 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2390 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2391
2392 if (!sdata->u.mgd.use_4addr)
2393 return -1;
1ecef20c 2394 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
fbb327c5
FF		 2395 check_port_control = true;
2396 }
2397
9bc383de 2398 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2399 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2400 return -1;
571ecf67 2401
fbb327c5 2402 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2403 if (ret < 0)
fbb327c5
FF		 2404 return ret;
2405
2406 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2407 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2408 *port_control = true;
2409 else if (check_port_control)
fbb327c5
FF		 2410 return -1;
2411
2412 return 0;
76ee65bf 2413}
571ecf67 2414
ce3edf6d
JB		 2415/*
2416 * requires that rx->skb is a frame with ethernet header
2417 */
358c8d9d 2418static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2419{
c97c23e3 2420 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2421 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2422 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2423
2424 /*
2425 * Allow EAPOL frames to us/the PAE group address regardless
2426 * of whether the frame was encrypted or not.
2427 */
a621fa4d 2428 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2429 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2430 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2431 return true;
2432
2433 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2434 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2435 return false;
2436
2437 return true;
2438}
2439
018f6fbf
DK		 2440static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2441 struct ieee80211_rx_data *rx)
2442{
2443 struct ieee80211_sub_if_data *sdata = rx->sdata;
2444 struct net_device *dev = sdata->dev;
2445
2446 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2447 skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2448 sdata->control_port_over_nl80211)) {
2449 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
f8b43c5c 2450 bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
018f6fbf 2451
a948f713 2452 cfg80211_rx_control_port(dev, skb, noencrypt);
018f6fbf
DK		 2453 dev_kfree_skb(skb);
2454 } else {
c8a41c6a
DK		 2455 memset(skb->cb, 0, sizeof(skb->cb));
2456
018f6fbf
DK		 2457 /* deliver to local stack */
2458 if (rx->napi)
2459 napi_gro_receive(rx->napi, skb);
2460 else
2461 netif_receive_skb(skb);
2462 }
2463}
2464
ce3edf6d
JB		 2465/*
2466 * requires that rx->skb is a frame with ethernet header
2467 */
76ee65bf 2468static void
5cf121c3 2469ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2470{
eb9fb5b8
JB		 2471 struct ieee80211_sub_if_data *sdata = rx->sdata;
2472 struct net_device *dev = sdata->dev;
76ee65bf 2473 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2474 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2475 struct sta_info *dsta;
571ecf67 2476
76ee65bf
RR		 2477 skb = rx->skb;
2478 xmit_skb = NULL;
571ecf67 2479
5a490510
JB		 2480 ieee80211_rx_stats(dev, skb->len);
2481
de8f18d3
JB		 2482 if (rx->sta) {
2483 /* The seqno index has the same property as needed
2484 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2485 * for non-QoS-data frames. Here we know it's a data
2486 * frame, so count MSDUs.
2487 */
0f9c5a61 2488 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
de8f18d3 2489 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
0f9c5a61 2490 u64_stats_update_end(&rx->sta->rx_stats.syncp);
de8f18d3
JB		 2491 }
2492
05c914fe
JB		 2493 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2494 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2495 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2496 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
72f15d53
MB		 2497 if (is_multicast_ether_addr(ehdr->h_dest) &&
2498 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
ce3edf6d
JB		 2499 /*
2500 * send multicast frames both to higher layers in
2501 * local net stack and back to the wireless medium
2502 */
76ee65bf 2503 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2504 if (!xmit_skb)
bdcbd8e0 2505 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2506 dev->name);
42dca5ef
JB		 2507 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2508 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2509 dsta = sta_info_get(sdata, ehdr->h_dest);
abe60632 2510 if (dsta) {
ce3edf6d
JB		 2511 /*
2512 * The destination station is associated to
2513 * this AP (in this VLAN), so send the frame
2514 * directly to it and do not pass it to local
2515 * net stack.
571ecf67 2516 */
76ee65bf 2517 xmit_skb = skb;
571ecf67
JB		 2518 skb = NULL;
2519 }
571ecf67
JB		 2520 }
2521 }
2522
59d9cb07 2523#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2524 if (skb) {
2525 /* 'align' will only take the values 0 or 2 here since all
2526 * frames are required to be aligned to 2-byte boundaries
2527 * when being passed to mac80211; the code here works just
2528 * as well if that isn't true, but mac80211 assumes it can
2529 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2530 */
9e890a1f
JB		 2531 int align;
2532
2533 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2534 if (align) {
2535 if (WARN_ON(skb_headroom(skb) < 3)) {
2536 dev_kfree_skb(skb);
2537 skb = NULL;
2538 } else {
2539 u8 *data = skb->data;
8ce0b589
ZY		 2540 size_t len = skb_headlen(skb);
2541 skb->data -= align;
2542 memmove(skb->data, data, len);
2543 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2544 }
2545 }
9e890a1f 2546 }
d1c3a37c
JB		 2547#endif
2548
9e890a1f 2549 if (skb) {
9e890a1f 2550 skb->protocol = eth_type_trans(skb, dev);
018f6fbf 2551 ieee80211_deliver_skb_to_local_stack(skb, rx);
571ecf67
JB		 2552 }
2553
76ee65bf 2554 if (xmit_skb) {
aef6c928
HS		 2555 /*
2556 * Send to wireless media and increase priority by 256 to
2557 * keep the received priority instead of reclassifying
2558 * the frame (see cfg80211_classify8021d).
2559 */
2560 xmit_skb->priority += 256;
f831e909 2561 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2562 skb_reset_network_header(xmit_skb);
2563 skb_reset_mac_header(xmit_skb);
76ee65bf 2564 dev_queue_xmit(xmit_skb);
571ecf67 2565 }
76ee65bf
RR		 2566}
2567
49461622 2568static ieee80211_rx_result debug_noinline
24bba078 2569__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
fd4c7f2f 2570{
eb9fb5b8 2571 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2572 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2573 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2574 __le16 fc = hdr->frame_control;
eaf85ca7 2575 struct sk_buff_head frame_list;
7f6990c8 2576 struct ethhdr ethhdr;
e2b5227f 2577 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
fd4c7f2f 2578
ea720935 2579 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
e2b5227f
JB		 2580 check_da = NULL;
2581 check_sa = NULL;
2582 } else switch (rx->sdata->vif.type) {
2583 case NL80211_IFTYPE_AP:
2584 case NL80211_IFTYPE_AP_VLAN:
2585 check_da = NULL;
2586 break;
2587 case NL80211_IFTYPE_STATION:
2588 if (!rx->sta ||
2589 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2590 check_sa = NULL;
2591 break;
2592 case NL80211_IFTYPE_MESH_POINT:
2593 check_sa = NULL;
2594 break;
2595 default:
2596 break;
ea720935 2597 }
fd4c7f2f 2598
eaf85ca7
ZY		 2599 skb->dev = dev;
2600 __skb_queue_head_init(&frame_list);
fd4c7f2f 2601
7f6990c8
JB		 2602 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2603 rx->sdata->vif.addr,
24bba078
FF		 2604 rx->sdata->vif.type,
2605 data_offset))
7f6990c8
JB		 2606 return RX_DROP_UNUSABLE;
2607
eaf85ca7
ZY		 2608 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2609 rx->sdata->vif.type,
8b935ee2 2610 rx->local->hw.extra_tx_headroom,
e2b5227f 2611 check_da, check_sa);
fd4c7f2f 2612
eaf85ca7
ZY		 2613 while (!skb_queue_empty(&frame_list)) {
2614 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2615
358c8d9d 2616 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2617 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2618 continue;
2619 }
fd4c7f2f
RR		 2620
2621 ieee80211_deliver_skb(rx);
2622 }
2623
9ae54c84 2624 return RX_QUEUED;
fd4c7f2f
RR		 2625}
2626
24bba078
FF		 2627static ieee80211_rx_result debug_noinline
2628ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2629{
2630 struct sk_buff *skb = rx->skb;
2631 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2633 __le16 fc = hdr->frame_control;
2634
2635 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2636 return RX_CONTINUE;
2637
2638 if (unlikely(!ieee80211_is_data(fc)))
2639 return RX_CONTINUE;
2640
2641 if (unlikely(!ieee80211_is_data_present(fc)))
2642 return RX_DROP_MONITOR;
2643
2644 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2645 switch (rx->sdata->vif.type) {
2646 case NL80211_IFTYPE_AP_VLAN:
2647 if (!rx->sdata->u.vlan.sta)
2648 return RX_DROP_UNUSABLE;
2649 break;
2650 case NL80211_IFTYPE_STATION:
2651 if (!rx->sdata->u.mgd.use_4addr)
2652 return RX_DROP_UNUSABLE;
2653 break;
2654 default:
2655 return RX_DROP_UNUSABLE;
2656 }
2657 }
2658
2659 if (is_multicast_ether_addr(hdr->addr1))
2660 return RX_DROP_UNUSABLE;
2661
2662 return __ieee80211_rx_h_amsdu(rx, 0);
2663}
2664
bf94e17b 2665#ifdef CONFIG_MAC80211_MESH
b0dee578 2666static ieee80211_rx_result
e32f85f7
LCC		 2667ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2668{
30789eb6
TP		 2669 struct ieee80211_hdr *fwd_hdr, *hdr;
2670 struct ieee80211_tx_info *info;
e32f85f7 2671 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2672 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2673 struct ieee80211_local *local = rx->local;
eb9fb5b8 2674 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2675 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
cf440128 2676 u16 ac, q, hdrlen;
51d0af22 2677 int tailroom = 0;
e32f85f7
LCC		 2678
2679 hdr = (struct ieee80211_hdr *) skb->data;
2680 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2681
2682 /* make sure fixed part of mesh header is there, also checks skb len */
2683 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2684 return RX_DROP_MONITOR;
2685
2686 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2687
2688 /* make sure full mesh header is there, also checks skb len */
2689 if (!pskb_may_pull(rx->skb,
2690 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2691 return RX_DROP_MONITOR;
2692
2693 /* reload pointers */
2694 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2695 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2696
d0c22119
BC		 2697 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2698 return RX_DROP_MONITOR;
2699
2157fdd6
TP		 2700 /* frame is in RMC, don't forward */
2701 if (ieee80211_is_data(hdr->frame_control) &&
2702 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2703 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2704 return RX_DROP_MONITOR;
2705
5c90067c 2706 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2707 return RX_CONTINUE;
2708
2709 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2710 return RX_DROP_MONITOR;
2711
43b7b314 2712 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2713 struct mesh_path *mppath;
43b7b314
JC		 2714 char *proxied_addr;
2715 char *mpp_addr;
2716
2717 if (is_multicast_ether_addr(hdr->addr1)) {
2718 mpp_addr = hdr->addr3;
2719 proxied_addr = mesh_hdr->eaddr1;
5667c86a
RM		 2720 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2721 MESH_FLAGS_AE_A5_A6) {
9b395bc3 2722 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2723 mpp_addr = hdr->addr4;
2724 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2725 } else {
2726 return RX_DROP_MONITOR;
43b7b314 2727 }
79617dee 2728
79617dee 2729 rcu_read_lock();
bf7cd94d 2730 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2731 if (!mppath) {
bf7cd94d 2732 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2733 } else {
2734 spin_lock_bh(&mppath->state_lock);
b203ca39 2735 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2736 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
ab1c7906 2737 mppath->exp_time = jiffies;
79617dee
Y		 2738 spin_unlock_bh(&mppath->state_lock);
2739 }
2740 rcu_read_unlock();
2741 }
2742
3c5772a5
JC		 2743 /* Frame has reached destination. Don't forward */
2744 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2745 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2746 return RX_CONTINUE;
2747
cf440128
MK		 2748 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2749 q = sdata->vif.hw_queue[ac];
d3c1597b 2750 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2751 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2752 return RX_DROP_MONITOR;
2753 }
2754 skb_set_queue_mapping(skb, q);
e32f85f7 2755
30789eb6 2756 if (!--mesh_hdr->ttl) {
a0dc0203
BC		 2757 if (!is_multicast_ether_addr(hdr->addr1))
2758 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2759 dropped_frames_ttl);
2ac64cd1 2760 goto out;
30789eb6
TP		 2761 }
2762
d665508b
CYY		 2763 if (!ifmsh->mshcfg.dot11MeshForwarding)
2764 goto out;
2765
51d0af22
FF		 2766 if (sdata->crypto_tx_tailroom_needed_cnt)
2767 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2768
c38c39bf 2769 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
51d0af22
FF		 2770 sdata->encrypt_headroom,
2771 tailroom, GFP_ATOMIC);
0c3d5a96 2772 if (!fwd_skb)
30789eb6 2773 goto out;
30789eb6
TP		 2774
2775 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2776 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2777 info = IEEE80211_SKB_CB(fwd_skb);
2778 memset(info, 0, sizeof(*info));
2779 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2780 info->control.vif = &rx->sdata->vif;
2781 info->control.jiffies = jiffies;
2782 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2783 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2784 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2785 /* update power mode indication when forwarding */
2786 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2787 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2788 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2789 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2790 } else {
2791 /* unable to resolve next hop */
bf7cd94d 2792 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2793 fwd_hdr->addr3, 0,
2794 WLAN_REASON_MESH_PATH_NOFORWARD,
2795 fwd_hdr->addr2);
30789eb6 2796 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2797 kfree_skb(fwd_skb);
30789eb6 2798 return RX_DROP_MONITOR;
e32f85f7
LCC		 2799 }
2800
30789eb6
TP		 2801 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2802 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2803 out:
df140465 2804 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2805 return RX_CONTINUE;
df140465 2806 return RX_DROP_MONITOR;
e32f85f7 2807}
bf94e17b 2808#endif
e32f85f7 2809
49461622 2810static ieee80211_rx_result debug_noinline
5cf121c3 2811ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2812{
eb9fb5b8 2813 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2814 struct ieee80211_local *local = rx->local;
eb9fb5b8 2815 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2816 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2817 __le16 fc = hdr->frame_control;
4114fa21 2818 bool port_control;
ce3edf6d 2819 int err;
76ee65bf 2820
358c8d9d 2821 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2822 return RX_CONTINUE;
76ee65bf 2823
358c8d9d 2824 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2825 return RX_DROP_MONITOR;
76ee65bf 2826
f14543ee 2827 /*
e7f4a940
JB		 2828 * Send unexpected-4addr-frame event to hostapd. For older versions,
2829 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2830 */
2831 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2832 sdata->vif.type == NL80211_IFTYPE_AP) {
2833 if (rx->sta &&
2834 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2835 cfg80211_rx_unexpected_4addr_frame(
2836 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2837 return RX_DROP_MONITOR;
e7f4a940 2838 }
f14543ee 2839
4114fa21 2840 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2841 if (unlikely(err))
e4c26add 2842 return RX_DROP_UNUSABLE;
76ee65bf 2843
358c8d9d 2844 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2845 return RX_DROP_MONITOR;
ce3edf6d 2846
8a4d32f3
AN		 2847 /* directly handle TDLS channel switch requests/responses */
2848 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2849 cpu_to_be16(ETH_P_TDLS))) {
2850 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2851
2852 if (pskb_may_pull(rx->skb,
2853 offsetof(struct ieee80211_tdls_data, u)) &&
2854 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2855 tf->category == WLAN_CATEGORY_TDLS &&
2856 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2857 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2858 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2859 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2860 if (rx->sta)
e5a9f8d0 2861 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2862
2863 return RX_QUEUED;
2864 }
2865 }
2866
4114fa21
FF		 2867 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2868 unlikely(port_control) && sdata->bss) {
2869 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2870 u.ap);
2871 dev = sdata->dev;
2872 rx->sdata = sdata;
2873 }
2874
76ee65bf
RR		 2875 rx->skb->dev = dev;
2876
602fae42
JB		 2877 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2878 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2879 !is_multicast_ether_addr(
2880 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2881 (!local->scanning &&
602fae42
JB		 2882 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2883 mod_timer(&local->dynamic_ps_timer, jiffies +
2884 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
e15276a4 2885
76ee65bf 2886 ieee80211_deliver_skb(rx);
571ecf67 2887
9ae54c84 2888 return RX_QUEUED;
571ecf67
JB		 2889}
2890
49461622 2891static ieee80211_rx_result debug_noinline
f9e124fb 2892ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2893{
71364716 2894 struct sk_buff *skb = rx->skb;
a7767f95 2895 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2896 struct tid_ampdu_rx *tid_agg_rx;
2897 u16 start_seq_num;
2898 u16 tid;
2899
a7767f95 2900 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2901 return RX_CONTINUE;
71364716 2902
a7767f95 2903 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2904 struct {
2905 __le16 control, start_seq_num;
2906 } __packed bar_data;
6382246e
EG		 2907 struct ieee80211_event event = {
2908 .type = BAR_RX_EVENT,
2909 };
8ae5977f 2910
71364716 2911 if (!rx->sta)
a02ae758 2912 return RX_DROP_MONITOR;
8ae5977f
JB		 2913
2914 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2915 &bar_data, sizeof(bar_data)))
2916 return RX_DROP_MONITOR;
2917
8ae5977f 2918 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d 2919
53f24974
JB		 2920 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2921 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2922 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2923 WLAN_BACK_RECIPIENT,
2924 WLAN_REASON_QSTA_REQUIRE_SETUP);
2925
a87f736d
JB		 2926 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2927 if (!tid_agg_rx)
a02ae758 2928 return RX_DROP_MONITOR;
71364716 2929
8ae5977f 2930 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2931 event.u.ba.tid = tid;
2932 event.u.ba.ssn = start_seq_num;
2933 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2934
2935 /* reset session timer */
20ad19d0
JB		 2936 if (tid_agg_rx->timeout)
2937 mod_timer(&tid_agg_rx->session_timer,
2938 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2939
dd318575 2940 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2941 /* release stored frames up to start of BAR */
d3b2fb53 2942 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2943 start_seq_num, frames);
dd318575
JB		 2944 spin_unlock(&tid_agg_rx->reorder_lock);
2945
6382246e
EG		 2946 drv_event_callback(rx->local, rx->sdata, &event);
2947
a02ae758
JB		 2948 kfree_skb(skb);
2949 return RX_QUEUED;
71364716
RR		 2950 }
2951
08daecae
JB		 2952 /*
2953 * After this point, we only want management frames,
2954 * so we can drop all remaining control frames to
2955 * cooked monitor interfaces.
2956 */
2957 return RX_DROP_MONITOR;
71364716
RR		 2958}
2959
f4f727a6
JM		 2960static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2961 struct ieee80211_mgmt *mgmt,
2962 size_t len)
fea14732
JM		 2963{
2964 struct ieee80211_local *local = sdata->local;
2965 struct sk_buff *skb;
2966 struct ieee80211_mgmt *resp;
2967
b203ca39 2968 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2969 /* Not to own unicast address */
2970 return;
2971 }
2972
b203ca39
JP		 2973 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2974 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2975 /* Not from the current AP or not associated yet. */
fea14732
JM		 2976 return;
2977 }
2978
2979 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2980 /* Too short SA Query request frame */
2981 return;
2982 }
2983
2984 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2985 if (skb == NULL)
2986 return;
2987
2988 skb_reserve(skb, local->hw.extra_tx_headroom);
b080db58 2989 resp = skb_put_zero(skb, 24);
fea14732 2990 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2991 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2992 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2993 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2994 IEEE80211_STYPE_ACTION);
2995 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2996 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2997 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2998 memcpy(resp->u.action.u.sa_query.trans_id,
2999 mgmt->u.action.u.sa_query.trans_id,
3000 WLAN_SA_QUERY_TR_ID_LEN);
3001
62ae67be 3002 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 3003}
3004
2e161f78
JB		 3005static ieee80211_rx_result debug_noinline
3006ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3007{
3008 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 3009 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 3010
3011 /*
3012 * From here on, look only at management frames.
3013 * Data and control frames are already handled,
3014 * and unknown (reserved) frames are useless.
3015 */
3016 if (rx->skb->len < 24)
3017 return RX_DROP_MONITOR;
3018
3019 if (!ieee80211_is_mgmt(mgmt->frame_control))
3020 return RX_DROP_MONITOR;
3021
ee971924
JB		 3022 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3023 ieee80211_is_beacon(mgmt->frame_control) &&
3024 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 3025 int sig = 0;
3026
1ad22fb5
T		 3027 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3028 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
804483e9
JB		 3029 sig = status->signal;
3030
ee971924
JB		 3031 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3032 rx->skb->data, rx->skb->len,
37c73b5f 3033 status->freq, sig);
ee971924
JB		 3034 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3035 }
3036
2e161f78
JB		 3037 if (ieee80211_drop_unencrypted_mgmt(rx))
3038 return RX_DROP_UNUSABLE;
3039
3040 return RX_CONTINUE;
3041}
3042
de1ede7a
JB		 3043static ieee80211_rx_result debug_noinline
3044ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3045{
3046 struct ieee80211_local *local = rx->local;
eb9fb5b8 3047 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 3048 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 3049 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 3050 int len = rx->skb->len;
3051
3052 if (!ieee80211_is_action(mgmt->frame_control))
3053 return RX_CONTINUE;
3054
026331c4
JM		 3055 /* drop too small frames */
3056 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 3057 return RX_DROP_UNUSABLE;
de1ede7a 3058
815b8092 3059 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 3060 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3061 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 3062 return RX_DROP_UNUSABLE;
de1ede7a 3063
de1ede7a 3064 switch (mgmt->u.action.category) {
1d8d3dec
JB		 3065 case WLAN_CATEGORY_HT:
3066 /* reject HT action frames from stations not supporting HT */
3067 if (!rx->sta->sta.ht_cap.ht_supported)
3068 goto invalid;
3069
3070 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3071 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3072 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3073 sdata->vif.type != NL80211_IFTYPE_AP &&
3074 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3075 break;
3076
ec61cd63 3077 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 3078 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3079 goto invalid;
3080
3081 switch (mgmt->u.action.u.ht_smps.action) {
3082 case WLAN_HT_ACTION_SMPS: {
3083 struct ieee80211_supported_band *sband;
af0ed69b 3084 enum ieee80211_smps_mode smps_mode;
ff84e7bf 3085 struct sta_opmode_info sta_opmode = {};
1d8d3dec
JB		 3086
3087 /* convert to HT capability */
3088 switch (mgmt->u.action.u.ht_smps.smps_control) {
3089 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 3090 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 3091 break;
3092 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 3093 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 3094 break;
3095 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 3096 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 3097 break;
3098 default:
3099 goto invalid;
3100 }
1d8d3dec
JB		 3101
3102 /* if no change do nothing */
af0ed69b 3103 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 3104 goto handled;
af0ed69b 3105 rx->sta->sta.smps_mode = smps_mode;
57566b20 3106 sta_opmode.smps_mode =
3107 ieee80211_smps_mode_to_smps_mode(smps_mode);
ff84e7bf 3108 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
1d8d3dec
JB		 3109
3110 sband = rx->local->hw.wiphy->bands[status->band];
3111
64f68e5d
JB		 3112 rate_control_rate_update(local, sband, rx->sta,
3113 IEEE80211_RC_SMPS_CHANGED);
ff84e7bf 3114 cfg80211_sta_opmode_change_notify(sdata->dev,
3115 rx->sta->addr,
3116 &sta_opmode,
c752cac9 3117 GFP_ATOMIC);
1d8d3dec
JB		 3118 goto handled;
3119 }
ec61cd63
JB		 3120 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3121 struct ieee80211_supported_band *sband;
3122 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 3123 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ff84e7bf 3124 struct sta_opmode_info sta_opmode = {};
ec61cd63
JB		 3125
3126 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 3127 if (!(rx->sta->sta.ht_cap.cap &
3128 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 3129 goto handled;
3130
e1a0c6b3 3131 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 3132 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 3133 else
1c45c5ce
EP		 3134 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3135
3136 /* set cur_max_bandwidth and recalc sta bw */
3137 rx->sta->cur_max_bandwidth = max_bw;
3138 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 3139
e1a0c6b3 3140 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 3141 goto handled;
3142
1c45c5ce 3143 rx->sta->sta.bandwidth = new_bw;
ec61cd63 3144 sband = rx->local->hw.wiphy->bands[status->band];
97f5f425 3145 sta_opmode.bw =
3146 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
ff84e7bf 3147 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
ec61cd63
JB		 3148
3149 rate_control_rate_update(local, sband, rx->sta,
3150 IEEE80211_RC_BW_CHANGED);
ff84e7bf 3151 cfg80211_sta_opmode_change_notify(sdata->dev,
3152 rx->sta->addr,
3153 &sta_opmode,
c752cac9 3154 GFP_ATOMIC);
ec61cd63
JB		 3155 goto handled;
3156 }
1d8d3dec
JB		 3157 default:
3158 goto invalid;
3159 }
3160
0af83d3d 3161 break;
1b3a2e49
JB		 3162 case WLAN_CATEGORY_PUBLIC:
3163 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3164 goto invalid;
3165 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3166 break;
3167 if (!rx->sta)
3168 break;
3169 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3170 break;
3171 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3172 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3173 break;
3174 if (len < offsetof(struct ieee80211_mgmt,
3175 u.action.u.ext_chan_switch.variable))
3176 goto invalid;
3177 goto queue;
0af83d3d
JB		 3178 case WLAN_CATEGORY_VHT:
3179 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3180 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3181 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3182 sdata->vif.type != NL80211_IFTYPE_AP &&
3183 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3184 break;
3185
3186 /* verify action code is present */
3187 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3188 goto invalid;
3189
3190 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3191 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
0af83d3d
JB		 3192 /* verify opmode is present */
3193 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3194 goto invalid;
d2941df8 3195 goto queue;
0af83d3d 3196 }
23a1f8d4
SS		 3197 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3198 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3199 goto invalid;
3200 goto queue;
3201 }
0af83d3d
JB		 3202 default:
3203 break;
3204 }
1d8d3dec 3205 break;
de1ede7a 3206 case WLAN_CATEGORY_BACK:
8abd3f9b 3207 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 3208 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 3209 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 3210 sdata->vif.type != NL80211_IFTYPE_AP &&
3211 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 3212 break;
8abd3f9b 3213
026331c4
JM		 3214 /* verify action_code is present */
3215 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3216 break;
3217
de1ede7a
JB		 3218 switch (mgmt->u.action.u.addba_req.action_code) {
3219 case WLAN_ACTION_ADDBA_REQ:
3220 if (len < (IEEE80211_MIN_ACTION_SIZE +
3221 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 3222 goto invalid;
3223 break;
de1ede7a
JB		 3224 case WLAN_ACTION_ADDBA_RESP:
3225 if (len < (IEEE80211_MIN_ACTION_SIZE +
3226 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 3227 goto invalid;
3228 break;
de1ede7a
JB		 3229 case WLAN_ACTION_DELBA:
3230 if (len < (IEEE80211_MIN_ACTION_SIZE +
3231 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 3232 goto invalid;
3233 break;
3234 default:
3235 goto invalid;
de1ede7a 3236 }
bed7ee6e 3237
8b58ff83 3238 goto queue;
39192c0b 3239 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 3240 /* verify action_code is present */
3241 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3242 break;
3243
39192c0b
JB		 3244 switch (mgmt->u.action.u.measurement.action_code) {
3245 case WLAN_ACTION_SPCT_MSR_REQ:
57fbcce3 3246 if (status->band != NL80211_BAND_5GHZ)
cd7760e6
SW		 3247 break;
3248
39192c0b
JB		 3249 if (len < (IEEE80211_MIN_ACTION_SIZE +
3250 sizeof(mgmt->u.action.u.measurement)))
84040805 3251 break;
cd7760e6
SW		 3252
3253 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3254 break;
3255
39192c0b 3256 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 3257 goto handled;
cd7760e6
SW		 3258 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3259 u8 *bssid;
3260 if (len < (IEEE80211_MIN_ACTION_SIZE +
3261 sizeof(mgmt->u.action.u.chan_switch)))
84040805 3262 break;
cc32abd4 3263
cd7760e6 3264 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 3265 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3266 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 3267 break;
3268
3269 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3270 bssid = sdata->u.mgd.bssid;
3271 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3272 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 3273 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3274 bssid = mgmt->sa;
cd7760e6
SW		 3275 else
3276 break;
3277
3278 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 3279 break;
c481ec97 3280
8b58ff83 3281 goto queue;
cd7760e6 3282 }
39192c0b
JB		 3283 }
3284 break;
fea14732
JM		 3285 case WLAN_CATEGORY_SA_QUERY:
3286 if (len < (IEEE80211_MIN_ACTION_SIZE +
3287 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 3288 break;
3289
fea14732
JM		 3290 switch (mgmt->u.action.u.sa_query.action) {
3291 case WLAN_ACTION_SA_QUERY_REQUEST:
3292 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 3293 break;
fea14732 3294 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 3295 goto handled;
fea14732
JM		 3296 }
3297 break;
8db09850 3298 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 3299 if (len < (IEEE80211_MIN_ACTION_SIZE +
3300 sizeof(mgmt->u.action.u.self_prot.action_code)))
3301 break;
3302
8db09850
TP		 3303 switch (mgmt->u.action.u.self_prot.action_code) {
3304 case WLAN_SP_MESH_PEERING_OPEN:
3305 case WLAN_SP_MESH_PEERING_CLOSE:
3306 case WLAN_SP_MESH_PEERING_CONFIRM:
3307 if (!ieee80211_vif_is_mesh(&sdata->vif))
3308 goto invalid;
a6dad6a2 3309 if (sdata->u.mesh.user_mpm)
8db09850
TP		 3310 /* userspace handles this frame */
3311 break;
3312 goto queue;
3313 case WLAN_SP_MGK_INFORM:
3314 case WLAN_SP_MGK_ACK:
3315 if (!ieee80211_vif_is_mesh(&sdata->vif))
3316 goto invalid;
3317 break;
3318 }
3319 break;
d3aaec8a 3320 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 3321 if (len < (IEEE80211_MIN_ACTION_SIZE +
3322 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3323 break;
3324
77a121c3
JB		 3325 if (!ieee80211_vif_is_mesh(&sdata->vif))
3326 break;
25d49e4d 3327 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 3328 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 3329 break;
3330 goto queue;
84040805 3331 }
026331c4 3332
2e161f78
JB		 3333 return RX_CONTINUE;
3334
bed7ee6e 3335 invalid:
554891e6 3336 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 3337 /* will return in the next handlers */
3338 return RX_CONTINUE;
3339
3340 handled:
3341 if (rx->sta)
e5a9f8d0 3342 rx->sta->rx_stats.packets++;
2e161f78
JB		 3343 dev_kfree_skb(rx->skb);
3344 return RX_QUEUED;
3345
3346 queue:
2e161f78
JB		 3347 skb_queue_tail(&sdata->skb_queue, rx->skb);
3348 ieee80211_queue_work(&local->hw, &sdata->work);
3349 if (rx->sta)
e5a9f8d0 3350 rx->sta->rx_stats.packets++;
2e161f78
JB		 3351 return RX_QUEUED;
3352}
3353
3354static ieee80211_rx_result debug_noinline
3355ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3356{
554891e6 3357 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 3358 int sig = 0;
2e161f78
JB		 3359
3360 /* skip known-bad action frames and return them in the next handler */
554891e6 3361 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 3362 return RX_CONTINUE;
d7907448 3363
026331c4
JM		 3364 /*
3365 * Getting here means the kernel doesn't know how to handle
3366 * it, but maybe userspace does ... include returned frames
3367 * so userspace can register for those to know whether ones
3368 * it transmitted were processed or returned.
3369 */
026331c4 3370
1ad22fb5
T		 3371 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3372 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
804483e9
JB		 3373 sig = status->signal;
3374
71bbc994 3375 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 3376 rx->skb->data, rx->skb->len, 0)) {
2e161f78 3377 if (rx->sta)
e5a9f8d0 3378 rx->sta->rx_stats.packets++;
2e161f78
JB		 3379 dev_kfree_skb(rx->skb);
3380 return RX_QUEUED;
3381 }
3382
2e161f78
JB		 3383 return RX_CONTINUE;
3384}
3385
3386static ieee80211_rx_result debug_noinline
3387ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3388{
3389 struct ieee80211_local *local = rx->local;
3390 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3391 struct sk_buff *nskb;
3392 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 3393 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 3394
3395 if (!ieee80211_is_action(mgmt->frame_control))
3396 return RX_CONTINUE;
3397
3398 /*
3399 * For AP mode, hostapd is responsible for handling any action
3400 * frames that we didn't handle, including returning unknown
3401 * ones. For all other modes we will return them to the sender,
3402 * setting the 0x80 bit in the action category, as required by
4b5ebccc 3403 * 802.11-2012 9.24.4.
2e161f78
JB		 3404 * Newer versions of hostapd shall also use the management frame
3405 * registration mechanisms, but older ones still use cooked
3406 * monitor interfaces so push all frames there.
3407 */
554891e6 3408 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 3409 (sdata->vif.type == NL80211_IFTYPE_AP ||
3410 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3411 return RX_DROP_MONITOR;
026331c4 3412
4b5ebccc
JB		 3413 if (is_multicast_ether_addr(mgmt->da))
3414 return RX_DROP_MONITOR;
3415
84040805
JB		 3416 /* do not return rejected action frames */
3417 if (mgmt->u.action.category & 0x80)
3418 return RX_DROP_UNUSABLE;
3419
3420 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3421 GFP_ATOMIC);
3422 if (nskb) {
292b4df6 3423 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 3424
292b4df6
JL		 3425 nmgmt->u.action.category |= 0x80;
3426 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3427 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 3428
3429 memset(nskb->cb, 0, sizeof(nskb->cb));
3430
07e5a5f5
JB		 3431 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3432 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3433
3434 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3435 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3436 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 3437 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 3438 info->hw_queue =
3439 local->hw.offchannel_tx_hw_queue;
3440 }
3441
3442 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
b9771d41 3443 status->band, 0);
de1ede7a 3444 }
39192c0b
JB		 3445 dev_kfree_skb(rx->skb);
3446 return RX_QUEUED;
de1ede7a
JB		 3447}
3448
49461622 3449static ieee80211_rx_result debug_noinline
5cf121c3 3450ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3451{
eb9fb5b8 3452 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3453 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3454 __le16 stype;
571ecf67 3455
77a121c3 3456 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3457
77a121c3
JB		 3458 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3459 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3460 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3461 sdata->vif.type != NL80211_IFTYPE_STATION)
3462 return RX_DROP_MONITOR;
472dbc45 3463
77a121c3 3464 switch (stype) {
66e67e41 3465 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3466 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3467 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3468 /* process for all: mesh, mlme, ibss */
3469 break;
66e67e41
JB		 3470 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3471 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3472 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3473 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3474 if (is_multicast_ether_addr(mgmt->da) &&
3475 !is_broadcast_ether_addr(mgmt->da))
3476 return RX_DROP_MONITOR;
3477
77a121c3
JB		 3478 /* process only for station */
3479 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3480 return RX_DROP_MONITOR;
3481 break;
3482 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3483 /* process only for ibss and mesh */
3484 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3485 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3486 return RX_DROP_MONITOR;
3487 break;
3488 default:
3489 return RX_DROP_MONITOR;
3490 }
f9d540ee 3491
77a121c3
JB		 3492 /* queue up frame and kick off work to process it */
3493 skb_queue_tail(&sdata->skb_queue, rx->skb);
3494 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3495 if (rx->sta)
e5a9f8d0 3496 rx->sta->rx_stats.packets++;
46900298 3497
77a121c3 3498 return RX_QUEUED;
571ecf67
JB		 3499}
3500
5f0b7de5
JB		 3501static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3502 struct ieee80211_rate *rate)
3d30d949
MW		 3503{
3504 struct ieee80211_sub_if_data *sdata;
3505 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3506 struct sk_buff *skb = rx->skb, *skb2;
3507 struct net_device *prev_dev = NULL;
eb9fb5b8 3508 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3509 int needed_headroom;
3d30d949 3510
554891e6
JB		 3511 /*
3512 * If cooked monitor has been processed already, then
3513 * don't do it again. If not, set the flag.
3514 */
3515 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3516 goto out_free_skb;
554891e6 3517 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3518
152c477a
JB		 3519 /* If there are no cooked monitor interfaces, just free the SKB */
3520 if (!local->cooked_mntrs)
3521 goto out_free_skb;
3522
1f7bba79
JB		 3523 /* vendor data is long removed here */
3524 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3525 /* room for the radiotap header based on driver features */
1f7bba79 3526 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3527
293702a3
JB		 3528 if (skb_headroom(skb) < needed_headroom &&
3529 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3530 goto out_free_skb;
3d30d949 3531
293702a3 3532 /* prepend radiotap information */
973ef21a
FF		 3533 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3534 false);
3d30d949 3535
d57a544d 3536 skb_reset_mac_header(skb);
3d30d949
MW		 3537 skb->ip_summed = CHECKSUM_UNNECESSARY;
3538 skb->pkt_type = PACKET_OTHERHOST;
3539 skb->protocol = htons(ETH_P_802_2);
3540
3541 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3542 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3543 continue;
3544
05c914fe 3545 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
d8212184 3546 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3d30d949
MW		 3547 continue;
3548
3549 if (prev_dev) {
3550 skb2 = skb_clone(skb, GFP_ATOMIC);
3551 if (skb2) {
3552 skb2->dev = prev_dev;
5548a8a1 3553 netif_receive_skb(skb2);
3d30d949
MW		 3554 }
3555 }
3556
3557 prev_dev = sdata->dev;
5a490510 3558 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3559 }
3560
3561 if (prev_dev) {
3562 skb->dev = prev_dev;
5548a8a1 3563 netif_receive_skb(skb);
554891e6
JB		 3564 return;
3565 }
3d30d949
MW		 3566
3567 out_free_skb:
3568 dev_kfree_skb(skb);
3569}
3570
aa0c8636
CL		 3571static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3572 ieee80211_rx_result res)
3573{
3574 switch (res) {
3575 case RX_DROP_MONITOR:
3576 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3577 if (rx->sta)
e5a9f8d0 3578 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3579 /* fall through */
3580 case RX_CONTINUE: {
3581 struct ieee80211_rate *rate = NULL;
3582 struct ieee80211_supported_band *sband;
3583 struct ieee80211_rx_status *status;
3584
3585 status = IEEE80211_SKB_RXCB((rx->skb));
3586
3587 sband = rx->local->hw.wiphy->bands[status->band];
41cbb0f5 3588 if (status->encoding == RX_ENC_LEGACY)
aa0c8636
CL		 3589 rate = &sband->bitrates[status->rate_idx];
3590
3591 ieee80211_rx_cooked_monitor(rx, rate);
3592 break;
3593 }
3594 case RX_DROP_UNUSABLE:
3595 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3596 if (rx->sta)
e5a9f8d0 3597 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3598 dev_kfree_skb(rx->skb);
3599 break;
3600 case RX_QUEUED:
3601 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3602 break;
3603 }
3604}
571ecf67 3605
f9e124fb
CL		 3606static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3607 struct sk_buff_head *frames)
58905290 3608{
58905290 3609 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3610 struct sk_buff *skb;
8944b79f 3611
e32f85f7
LCC		 3612#define CALL_RXH(rxh) \
3613 do { \
3614 res = rxh(rx); \
3615 if (res != RX_CONTINUE) \
2569a826 3616 goto rxh_next; \
8ebaa5b0 3617 } while (0)
49461622 3618
45ceeee8
JB		 3619 /* Lock here to avoid hitting all of the data used in the RX
3620 * path (e.g. key data, station data, ...) concurrently when
3621 * a frame is released from the reorder buffer due to timeout
3622 * from the timer, potentially concurrently with RX from the
3623 * driver.
3624 */
f9e124fb 3625 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3626
f9e124fb 3627 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3628 /*
3629 * all the other fields are valid across frames
3630 * that belong to an aMPDU since they are on the
3631 * same TID from the same station
3632 */
3633 rx->skb = skb;
3634
8ebaa5b0
JB		 3635 CALL_RXH(ieee80211_rx_h_check_more_data);
3636 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3637 CALL_RXH(ieee80211_rx_h_sta_process);
3638 CALL_RXH(ieee80211_rx_h_decrypt);
3639 CALL_RXH(ieee80211_rx_h_defragment);
3640 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
2569a826 3641 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3642#ifdef CONFIG_MAC80211_MESH
aa0c8636 3643 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3644 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3645#endif
8ebaa5b0
JB		 3646 CALL_RXH(ieee80211_rx_h_amsdu);
3647 CALL_RXH(ieee80211_rx_h_data);
f9e124fb
CL		 3648
3649 /* special treatment -- needs the queue */
3650 res = ieee80211_rx_h_ctrl(rx, frames);
3651 if (res != RX_CONTINUE)
3652 goto rxh_next;
3653
8ebaa5b0
JB		 3654 CALL_RXH(ieee80211_rx_h_mgmt_check);
3655 CALL_RXH(ieee80211_rx_h_action);
3656 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3657 CALL_RXH(ieee80211_rx_h_action_return);
3658 CALL_RXH(ieee80211_rx_h_mgmt);
49461622 3659
aa0c8636
CL		 3660 rxh_next:
3661 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3662
49461622 3663#undef CALL_RXH
aa0c8636 3664 }
24a8fdad 3665
f9e124fb 3666 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3667}
3668
4406c376 3669static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3670{
f9e124fb 3671 struct sk_buff_head reorder_release;
aa0c8636
CL		 3672 ieee80211_rx_result res = RX_DROP_MONITOR;
3673
f9e124fb
CL		 3674 __skb_queue_head_init(&reorder_release);
3675
aa0c8636
CL		 3676#define CALL_RXH(rxh) \
3677 do { \
3678 res = rxh(rx); \
3679 if (res != RX_CONTINUE) \
3680 goto rxh_next; \
8ebaa5b0 3681 } while (0)
aa0c8636 3682
8ebaa5b0
JB		 3683 CALL_RXH(ieee80211_rx_h_check_dup);
3684 CALL_RXH(ieee80211_rx_h_check);
aa0c8636 3685
f9e124fb 3686 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3687
f9e124fb 3688 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3689 return;
49461622 3690
2569a826 3691 rxh_next:
aa0c8636
CL		 3692 ieee80211_rx_handlers_result(rx, res);
3693
3694#undef CALL_RXH
58905290
JB		 3695}
3696
2bff8ebf 3697/*
dd318575
JB		 3698 * This function makes calls into the RX path, therefore
3699 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3700 */
3701void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3702{
f9e124fb 3703 struct sk_buff_head frames;
554891e6
JB		 3704 struct ieee80211_rx_data rx = {
3705 .sta = sta,
3706 .sdata = sta->sdata,
3707 .local = sta->local,
9e26297a
JB		 3708 /* This is OK -- must be QoS data frame */
3709 .security_idx = tid,
3710 .seqno_idx = tid,
af9f9b22 3711 .napi = NULL, /* must be NULL to not have races */
554891e6 3712 };
2c15a0cf
CL		 3713 struct tid_ampdu_rx *tid_agg_rx;
3714
3715 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3716 if (!tid_agg_rx)
3717 return;
2bff8ebf 3718
f9e124fb
CL		 3719 __skb_queue_head_init(&frames);
3720
2c15a0cf 3721 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3722 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3723 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3724
b497de63
EG		 3725 if (!skb_queue_empty(&frames)) {
3726 struct ieee80211_event event = {
3727 .type = BA_FRAME_TIMEOUT,
3728 .u.ba.tid = tid,
3729 .u.ba.sta = &sta->sta,
3730 };
3731 drv_event_callback(rx.local, rx.sdata, &event);
3732 }
3733
f9e124fb 3734 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3735}
3736
06470f74
SS		 3737void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3738 u16 ssn, u64 filtered,
3739 u16 received_mpdus)
3740{
3741 struct sta_info *sta;
3742 struct tid_ampdu_rx *tid_agg_rx;
3743 struct sk_buff_head frames;
3744 struct ieee80211_rx_data rx = {
3745 /* This is OK -- must be QoS data frame */
3746 .security_idx = tid,
3747 .seqno_idx = tid,
3748 };
3749 int i, diff;
3750
3751 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3752 return;
3753
3754 __skb_queue_head_init(&frames);
3755
3756 sta = container_of(pubsta, struct sta_info, sta);
3757
3758 rx.sta = sta;
3759 rx.sdata = sta->sdata;
3760 rx.local = sta->local;
3761
3762 rcu_read_lock();
3763 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3764 if (!tid_agg_rx)
3765 goto out;
3766
3767 spin_lock_bh(&tid_agg_rx->reorder_lock);
3768
3769 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3770 int release;
3771
3772 /* release all frames in the reorder buffer */
3773 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3774 IEEE80211_SN_MODULO;
3775 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3776 release, &frames);
3777 /* update ssn to match received ssn */
3778 tid_agg_rx->head_seq_num = ssn;
3779 } else {
3780 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3781 &frames);
3782 }
3783
3784 /* handle the case that received ssn is behind the mac ssn.
3785 * it can be tid_agg_rx->buf_size behind and still be valid */
3786 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3787 if (diff >= tid_agg_rx->buf_size) {
3788 tid_agg_rx->reorder_buf_filtered = 0;
3789 goto release;
3790 }
3791 filtered = filtered >> diff;
3792 ssn += diff;
3793
3794 /* update bitmap */
3795 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3796 int index = (ssn + i) % tid_agg_rx->buf_size;
3797
3798 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3799 if (filtered & BIT_ULL(i))
3800 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3801 }
3802
3803 /* now process also frames that the filter marking released */
3804 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3805
3806release:
3807 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3808
3809 ieee80211_rx_handlers(&rx, &frames);
3810
3811 out:
3812 rcu_read_unlock();
3813}
3814EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3815
571ecf67
JB		 3816/* main receive path */
3817
a58fbe1a 3818static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3819{
20b01f80 3820 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3821 struct sk_buff *skb = rx->skb;
a58fbe1a 3822 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3823 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3824 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
e5f2e067 3825 bool multicast = is_multicast_ether_addr(hdr->addr1);
23a24def 3826
51fb61e7 3827 switch (sdata->vif.type) {
05c914fe 3828 case NL80211_IFTYPE_STATION:
9bc383de 3829 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3830 return false;
588f7d39
JB		 3831 if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
3832 return false;
a58fbe1a
JB		 3833 if (multicast)
3834 return true;
3835 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3836 case NL80211_IFTYPE_ADHOC:
23a24def 3837 if (!bssid)
3c2723f5 3838 return false;
6329b8d9
FF		 3839 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3840 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3841 return false;
a58fbe1a 3842 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3843 return true;
a58fbe1a 3844 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3845 return false;
a58fbe1a
JB		 3846 if (!multicast &&
3847 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3848 return false;
a58fbe1a 3849 if (!rx->sta) {
0fb8ca45 3850 int rate_idx;
da6a4352 3851 if (status->encoding != RX_ENC_LEGACY)
5614618e 3852 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3853 else
eb9fb5b8 3854 rate_idx = status->rate_idx;
8bf11d8d
JB		 3855 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3856 BIT(rate_idx));
0fb8ca45 3857 }
a58fbe1a 3858 return true;
239281f8
RL		 3859 case NL80211_IFTYPE_OCB:
3860 if (!bssid)
3861 return false;
cc117298 3862 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3863 return false;
a58fbe1a 3864 if (!is_broadcast_ether_addr(bssid))
239281f8 3865 return false;
a58fbe1a
JB		 3866 if (!multicast &&
3867 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3868 return false;
a58fbe1a 3869 if (!rx->sta) {
239281f8 3870 int rate_idx;
da6a4352 3871 if (status->encoding != RX_ENC_LEGACY)
239281f8
RL		 3872 rate_idx = 0; /* TODO: HT rates */
3873 else
3874 rate_idx = status->rate_idx;
3875 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3876 BIT(rate_idx));
3877 }
a58fbe1a 3878 return true;
05c914fe 3879 case NL80211_IFTYPE_MESH_POINT:
736a80bb
JB		 3880 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3881 return false;
a58fbe1a
JB		 3882 if (multicast)
3883 return true;
3884 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3885 case NL80211_IFTYPE_AP_VLAN:
3886 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3887 if (!bssid)
3888 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3889
3890 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3891 /*
3892 * Accept public action frames even when the
3893 * BSSID doesn't match, this is used for P2P
3894 * and location updates. Note that mac80211
3895 * itself never looks at these frames.
3896 */
2b9ccd4e
JB		 3897 if (!multicast &&
3898 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3899 return false;
d48b2968 3900 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3901 return true;
5c90067c 3902 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3903 }
3904
3905 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3906 /* ignore data frames to TDLS-peers */
3907 if (ieee80211_is_data(hdr->frame_control))
3908 return false;
3909 /* ignore action frames to TDLS-peers */
3910 if (ieee80211_is_action(hdr->frame_control) &&
1ec7bae8 3911 !is_broadcast_ether_addr(bssid) &&
db8e1732
AN		 3912 !ether_addr_equal(bssid, hdr->addr1))
3913 return false;
23a24def 3914 }
3018e947
JB		 3915
3916 /*
3917 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3918 * the BSSID - we've checked that already but may have accepted
3919 * the wildcard (ff:ff:ff:ff:ff:ff).
3920 *
3921 * It also says:
3922 * The BSSID of the Data frame is determined as follows:
3923 * a) If the STA is contained within an AP or is associated
3924 * with an AP, the BSSID is the address currently in use
3925 * by the STA contained in the AP.
3926 *
3927 * So we should not accept data frames with an address that's
3928 * multicast.
3929 *
3930 * Accepting it also opens a security problem because stations
3931 * could encrypt it with the GTK and inject traffic that way.
3932 */
3933 if (ieee80211_is_data(hdr->frame_control) && multicast)
3934 return false;
3935
a58fbe1a 3936 return true;
05c914fe 3937 case NL80211_IFTYPE_WDS:
a7767f95 3938 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3939 return false;
a58fbe1a 3940 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3941 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3942 return ieee80211_is_public_action(hdr, skb->len) ||
3943 ieee80211_is_probe_req(hdr->frame_control) ||
3944 ieee80211_is_probe_resp(hdr->frame_control) ||
3945 ieee80211_is_beacon(hdr->frame_control);
cb3b7d87
AB		 3946 case NL80211_IFTYPE_NAN:
3947 /* Currently no frames on NAN interface are allowed */
3948 return false;
2ca27bcf 3949 default:
fb1c1cd6 3950 break;
23a24def
JB		 3951 }
3952
a58fbe1a
JB		 3953 WARN_ON_ONCE(1);
3954 return false;
23a24def
JB		 3955}
3956
49ddf8e6
JB		 3957void ieee80211_check_fast_rx(struct sta_info *sta)
3958{
3959 struct ieee80211_sub_if_data *sdata = sta->sdata;
3960 struct ieee80211_local *local = sdata->local;
3961 struct ieee80211_key *key;
3962 struct ieee80211_fast_rx fastrx = {
3963 .dev = sdata->dev,
3964 .vif_type = sdata->vif.type,
3965 .control_port_protocol = sdata->control_port_protocol,
3966 }, *old, *new = NULL;
3967 bool assign = false;
3968
3969 /* use sparse to check that we don't return without updating */
3970 __acquire(check_fast_rx);
3971
3972 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3973 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3974 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3975 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3976
c9c5962b
JB		 3977 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3978
49ddf8e6
JB		 3979 /* fast-rx doesn't do reordering */
3980 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3981 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3982 goto clear;
3983
3984 switch (sdata->vif.type) {
3985 case NL80211_IFTYPE_STATION:
49ddf8e6
JB		 3986 if (sta->sta.tdls) {
3987 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3988 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3989 fastrx.expected_ds_bits = 0;
3990 } else {
3991 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3992 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3993 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3994 fastrx.expected_ds_bits =
3995 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3996 }
1d870162 3997
9251a473
FF		 3998 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3999 fastrx.expected_ds_bits |=
4000 cpu_to_le16(IEEE80211_FCTL_TODS);
4001 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4002 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4003 }
4004
1d870162
FF		 4005 if (!sdata->u.mgd.powersave)
4006 break;
4007
4008 /* software powersave is a huge mess, avoid all of it */
4009 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4010 goto clear;
4011 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4012 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4013 goto clear;
49ddf8e6
JB		 4014 break;
4015 case NL80211_IFTYPE_AP_VLAN:
4016 case NL80211_IFTYPE_AP:
4017 /* parallel-rx requires this, at least with calls to
4018 * ieee80211_sta_ps_transition()
4019 */
4020 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4021 goto clear;
4022 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4023 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4024 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4025
4026 fastrx.internal_forward =
4027 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4028 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4029 !sdata->u.vlan.sta);
59cae5b9
FF		 4030
4031 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4032 sdata->u.vlan.sta) {
4033 fastrx.expected_ds_bits |=
4034 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4035 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4036 fastrx.internal_forward = 0;
4037 }
4038
49ddf8e6
JB		 4039 break;
4040 default:
4041 goto clear;
4042 }
4043
4044 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4045 goto clear;
4046
4047 rcu_read_lock();
4048 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4049 if (key) {
4050 switch (key->conf.cipher) {
4051 case WLAN_CIPHER_SUITE_TKIP:
4052 /* we don't want to deal with MMIC in fast-rx */
4053 goto clear_rcu;
4054 case WLAN_CIPHER_SUITE_CCMP:
4055 case WLAN_CIPHER_SUITE_CCMP_256:
4056 case WLAN_CIPHER_SUITE_GCMP:
4057 case WLAN_CIPHER_SUITE_GCMP_256:
4058 break;
4059 default:
96fc6efb
AW		 4060 /* We also don't want to deal with
4061 * WEP or cipher scheme.
49ddf8e6
JB		 4062 */
4063 goto clear_rcu;
4064 }
4065
4066 fastrx.key = true;
4067 fastrx.icv_len = key->conf.icv_len;
4068 }
4069
4070 assign = true;
4071 clear_rcu:
4072 rcu_read_unlock();
4073 clear:
4074 __release(check_fast_rx);
4075
4076 if (assign)
4077 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4078
4079 spin_lock_bh(&sta->lock);
4080 old = rcu_dereference_protected(sta->fast_rx, true);
4081 rcu_assign_pointer(sta->fast_rx, new);
4082 spin_unlock_bh(&sta->lock);
4083
4084 if (old)
4085 kfree_rcu(old, rcu_head);
4086}
4087
4088void ieee80211_clear_fast_rx(struct sta_info *sta)
4089{
4090 struct ieee80211_fast_rx *old;
4091
4092 spin_lock_bh(&sta->lock);
4093 old = rcu_dereference_protected(sta->fast_rx, true);
4094 RCU_INIT_POINTER(sta->fast_rx, NULL);
4095 spin_unlock_bh(&sta->lock);
4096
4097 if (old)
4098 kfree_rcu(old, rcu_head);
4099}
4100
4101void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4102{
4103 struct ieee80211_local *local = sdata->local;
4104 struct sta_info *sta;
4105
4106 lockdep_assert_held(&local->sta_mtx);
4107
4108 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4109 if (sdata != sta->sdata &&
4110 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4111 continue;
4112 ieee80211_check_fast_rx(sta);
4113 }
4114}
4115
4116void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4117{
4118 struct ieee80211_local *local = sdata->local;
4119
4120 mutex_lock(&local->sta_mtx);
4121 __ieee80211_check_fast_rx_iface(sdata);
4122 mutex_unlock(&local->sta_mtx);
4123}
4124
4125static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4126 struct ieee80211_fast_rx *fast_rx)
4127{
4128 struct sk_buff *skb = rx->skb;
4129 struct ieee80211_hdr *hdr = (void *)skb->data;
4130 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4131 struct sta_info *sta = rx->sta;
4132 int orig_len = skb->len;
24bba078
FF		 4133 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4134 int snap_offs = hdrlen;
49ddf8e6
JB		 4135 struct {
4136 u8 snap[sizeof(rfc1042_header)];
4137 __be16 proto;
4138 } *payload __aligned(2);
4139 struct {
4140 u8 da[ETH_ALEN];
4141 u8 sa[ETH_ALEN];
4142 } addrs __aligned(2);
c9c5962b
JB		 4143 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4144
4145 if (fast_rx->uses_rss)
4146 stats = this_cpu_ptr(sta->pcpu_rx_stats);
49ddf8e6
JB		 4147
4148 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4149 * to a common data structure; drivers can implement that per queue
4150 * but we don't have that information in mac80211
4151 */
4152 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4153 return false;
4154
4155#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4156
4157 /* If using encryption, we also need to have:
4158 * - PN_VALIDATED: similar, but the implementation is tricky
4159 * - DECRYPTED: necessary for PN_VALIDATED
4160 */
4161 if (fast_rx->key &&
4162 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4163 return false;
4164
49ddf8e6
JB		 4165 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4166 return false;
4167
4168 if (unlikely(ieee80211_is_frag(hdr)))
4169 return false;
4170
4171 /* Since our interface address cannot be multicast, this
4172 * implicitly also rejects multicast frames without the
4173 * explicit check.
4174 *
4175 * We shouldn't get any *data* frames not addressed to us
4176 * (AP mode will accept multicast *management* frames), but
4177 * punting here will make it go through the full checks in
4178 * ieee80211_accept_frame().
4179 */
4180 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4181 return false;
4182
4183 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4184 IEEE80211_FCTL_TODS)) !=
4185 fast_rx->expected_ds_bits)
b323ac19 4186 return false;
49ddf8e6
JB		 4187
4188 /* assign the key to drop unencrypted frames (later)
4189 * and strip the IV/MIC if necessary
4190 */
4191 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4192 /* GCMP header length is the same */
4193 snap_offs += IEEE80211_CCMP_HDR_LEN;
4194 }
4195
24bba078
FF		 4196 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4197 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4198 goto drop;
49ddf8e6 4199
24bba078 4200 payload = (void *)(skb->data + snap_offs);
49ddf8e6 4201
24bba078
FF		 4202 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4203 return false;
4204
4205 /* Don't handle these here since they require special code.
4206 * Accept AARP and IPX even though they should come with a
4207 * bridge-tunnel header - but if we get them this way then
4208 * there's little point in discarding them.
4209 */
4210 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4211 payload->proto == fast_rx->control_port_protocol))
4212 return false;
4213 }
49ddf8e6
JB		 4214
4215 /* after this point, don't punt to the slowpath! */
4216
4217 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4218 pskb_trim(skb, skb->len - fast_rx->icv_len))
4219 goto drop;
4220
4221 if (unlikely(fast_rx->sta_notify)) {
4222 ieee80211_sta_rx_notify(rx->sdata, hdr);
4223 fast_rx->sta_notify = false;
4224 }
4225
4226 /* statistics part of ieee80211_rx_h_sta_process() */
49ddf8e6 4227 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
c9c5962b
JB		 4228 stats->last_signal = status->signal;
4229 if (!fast_rx->uses_rss)
4230 ewma_signal_add(&sta->rx_stats_avg.signal,
4231 -status->signal);
49ddf8e6
JB		 4232 }
4233
4234 if (status->chains) {
4235 int i;
4236
c9c5962b 4237 stats->chains = status->chains;
49ddf8e6
JB		 4238 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4239 int signal = status->chain_signal[i];
4240
4241 if (!(status->chains & BIT(i)))
4242 continue;
4243
c9c5962b
JB		 4244 stats->chain_signal_last[i] = signal;
4245 if (!fast_rx->uses_rss)
4246 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4247 -signal);
49ddf8e6
JB		 4248 }
4249 }
4250 /* end of statistics */
4251
4252 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4253 goto drop;
4254
24bba078
FF		 4255 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4256 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4257 RX_QUEUED)
4258 goto drop;
4259
4260 return true;
4261 }
4262
4263 stats->last_rx = jiffies;
4264 stats->last_rate = sta_stats_encode_rate(status);
4265
4266 stats->fragments++;
4267 stats->packets++;
4268
49ddf8e6
JB		 4269 /* do the header conversion - first grab the addresses */
4270 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4271 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4272 /* remove the SNAP but leave the ethertype */
4273 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4274 /* push the addresses in front */
4275 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4276
4277 skb->dev = fast_rx->dev;
4278
4279 ieee80211_rx_stats(fast_rx->dev, skb->len);
4280
4281 /* The seqno index has the same property as needed
4282 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4283 * for non-QoS-data frames. Here we know it's a data
4284 * frame, so count MSDUs.
4285 */
c9c5962b
JB		 4286 u64_stats_update_begin(&stats->syncp);
4287 stats->msdu[rx->seqno_idx]++;
4288 stats->bytes += orig_len;
4289 u64_stats_update_end(&stats->syncp);
49ddf8e6
JB		 4290
4291 if (fast_rx->internal_forward) {
eeb0d56f 4292 struct sk_buff *xmit_skb = NULL;
42dca5ef 4293 if (is_multicast_ether_addr(addrs.da)) {
eeb0d56f 4294 xmit_skb = skb_copy(skb, GFP_ATOMIC);
42dca5ef
JB		 4295 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4296 sta_info_get(rx->sdata, addrs.da)) {
eeb0d56f
JB		 4297 xmit_skb = skb;
4298 skb = NULL;
4299 }
49ddf8e6 4300
eeb0d56f 4301 if (xmit_skb) {
49ddf8e6
JB		 4302 /*
4303 * Send to wireless media and increase priority by 256
4304 * to keep the received priority instead of
4305 * reclassifying the frame (see cfg80211_classify8021d).
4306 */
eeb0d56f
JB		 4307 xmit_skb->priority += 256;
4308 xmit_skb->protocol = htons(ETH_P_802_3);
4309 skb_reset_network_header(xmit_skb);
4310 skb_reset_mac_header(xmit_skb);
4311 dev_queue_xmit(xmit_skb);
49ddf8e6 4312 }
eeb0d56f
JB		 4313
4314 if (!skb)
4315 return true;
49ddf8e6
JB		 4316 }
4317
4318 /* deliver to local stack */
4319 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4320 memset(skb->cb, 0, sizeof(skb->cb));
4321 if (rx->napi)
4322 napi_gro_receive(rx->napi, skb);
4323 else
4324 netif_receive_skb(skb);
4325
4326 return true;
4327 drop:
4328 dev_kfree_skb(skb);
c9c5962b 4329 stats->dropped++;
49ddf8e6
JB		 4330 return true;
4331}
4332
4406c376
JB		 4333/*
4334 * This function returns whether or not the SKB
4335 * was destined for RX processing or not, which,
4336 * if consume is true, is equivalent to whether
4337 * or not the skb was consumed.
4338 */
4339static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4340 struct sk_buff *skb, bool consume)
4341{
4342 struct ieee80211_local *local = rx->local;
4343 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 4344
4345 rx->skb = skb;
4406c376 4346
49ddf8e6
JB		 4347 /* See if we can do fast-rx; if we have to copy we already lost,
4348 * so punt in that case. We should never have to deliver a data
4349 * frame to multiple interfaces anyway.
4350 *
4351 * We skip the ieee80211_accept_frame() call and do the necessary
4352 * checking inside ieee80211_invoke_fast_rx().
4353 */
4354 if (consume && rx->sta) {
4355 struct ieee80211_fast_rx *fast_rx;
4356
4357 fast_rx = rcu_dereference(rx->sta->fast_rx);
4358 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4359 return true;
4360 }
4361
a58fbe1a 4362 if (!ieee80211_accept_frame(rx))
4406c376
JB		 4363 return false;
4364
4406c376
JB		 4365 if (!consume) {
4366 skb = skb_copy(skb, GFP_ATOMIC);
4367 if (!skb) {
4368 if (net_ratelimit())
4369 wiphy_debug(local->hw.wiphy,
b305dae4 4370 "failed to copy skb for %s\n",
4406c376
JB		 4371 sdata->name);
4372 return true;
4373 }
4374
4375 rx->skb = skb;
4376 }
4377
4378 ieee80211_invoke_rx_handlers(rx);
4379 return true;
4380}
4381
571ecf67 4382/*
6b59db7d 4383 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 4384 * be called with rcu_read_lock protection.
571ecf67 4385 */
71ebb4aa 4386static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
d63b548f 4387 struct ieee80211_sta *pubsta,
af9f9b22
JB		 4388 struct sk_buff *skb,
4389 struct napi_struct *napi)
571ecf67
JB		 4390{
4391 struct ieee80211_local *local = hw_to_local(hw);
4392 struct ieee80211_sub_if_data *sdata;
571ecf67 4393 struct ieee80211_hdr *hdr;
e3cf8b3f 4394 __le16 fc;
5cf121c3 4395 struct ieee80211_rx_data rx;
4406c376 4396 struct ieee80211_sub_if_data *prev;
83e7e4ce 4397 struct rhlist_head *tmp;
e3cf8b3f 4398 int err = 0;
571ecf67 4399
e3cf8b3f 4400 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 4401 memset(&rx, 0, sizeof(rx));
4402 rx.skb = skb;
4403 rx.local = local;
af9f9b22 4404 rx.napi = napi;
72abd81b 4405
e3cf8b3f 4406 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 4407 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 4408
4a4f1a58
JB		 4409 if (ieee80211_is_mgmt(fc)) {
4410 /* drop frame if too short for header */
4411 if (skb->len < ieee80211_hdrlen(fc))
4412 err = -ENOBUFS;
4413 else
4414 err = skb_linearize(skb);
4415 } else {
e3cf8b3f 4416 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 4417 }
e3cf8b3f
ZY		 4418
4419 if (err) {
4420 dev_kfree_skb(skb);
4421 return;
4422 }
4423
4424 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 4425 ieee80211_parse_qos(&rx);
d1c3a37c 4426 ieee80211_verify_alignment(&rx);
38f3714d 4427
d48b2968
JB		 4428 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4429 ieee80211_is_beacon(hdr->frame_control)))
4430 ieee80211_scan_rx(local, skb);
4431
19d19e96 4432 if (ieee80211_is_data(fc)) {
d63b548f 4433 struct sta_info *sta, *prev_sta;
7bedd0cf 4434
19d19e96
JB		 4435 if (pubsta) {
4436 rx.sta = container_of(pubsta, struct sta_info, sta);
4437 rx.sdata = rx.sta->sdata;
4438 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4439 return;
4440 goto out;
4441 }
4442
56af3268 4443 prev_sta = NULL;
4406c376 4444
83e7e4ce 4445 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 4446 if (!prev_sta) {
4447 prev_sta = sta;
4448 continue;
4449 }
4450
4451 rx.sta = prev_sta;
4452 rx.sdata = prev_sta->sdata;
4406c376 4453 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 4454
56af3268 4455 prev_sta = sta;
4406c376 4456 }
56af3268
BG		 4457
4458 if (prev_sta) {
4459 rx.sta = prev_sta;
4460 rx.sdata = prev_sta->sdata;
4461
4406c376 4462 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 4463 return;
8e26d5ad 4464 goto out;
56af3268 4465 }
4406c376
JB		 4466 }
4467
4b0dd98e 4468 prev = NULL;
b2e7771e 4469
4b0dd98e
JB		 4470 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4471 if (!ieee80211_sdata_running(sdata))
4472 continue;
340e11f3 4473
4b0dd98e
JB		 4474 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4475 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4476 continue;
340e11f3 4477
4b0dd98e
JB		 4478 /*
4479 * frame is destined for this interface, but if it's
4480 * not also for the previous one we handle that after
4481 * the loop to avoid copying the SKB once too much
4482 */
4bb29f8c 4483
4b0dd98e 4484 if (!prev) {
abe60632 4485 prev = sdata;
4b0dd98e 4486 continue;
340e11f3 4487 }
4bb29f8c 4488
7852e361 4489 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 4490 rx.sdata = prev;
4491 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 4492
4b0dd98e
JB		 4493 prev = sdata;
4494 }
4495
4496 if (prev) {
7852e361 4497 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 4498 rx.sdata = prev;
4406c376 4499
4b0dd98e
JB		 4500 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4501 return;
571ecf67 4502 }
4406c376 4503
8e26d5ad 4504 out:
4406c376 4505 dev_kfree_skb(skb);
571ecf67 4506}
6368e4b1
RR		 4507
4508/*
4509 * This is the receive path handler. It is called by a low level driver when an
4510 * 802.11 MPDU is received from the hardware.
4511 */
d63b548f
JB		 4512void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4513 struct sk_buff *skb, struct napi_struct *napi)
6368e4b1
RR		 4514{
4515 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 4516 struct ieee80211_rate *rate = NULL;
4517 struct ieee80211_supported_band *sband;
f1d58c25 4518 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 4519
d20ef63d
JB		 4520 WARN_ON_ONCE(softirq_count() == 0);
4521
57fbcce3 4522 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
77a980dc 4523 goto drop;
8318d78a
JB		 4524
4525 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 4526 if (WARN_ON(!sband))
4527 goto drop;
8318d78a 4528
89c3a8ac
JB		 4529 /*
4530 * If we're suspending, it is possible although not too likely
4531 * that we'd be receiving frames after having already partially
4532 * quiesced the stack. We can't process such frames then since
4533 * that might, for example, cause stations to be added or other
4534 * driver callbacks be invoked.
4535 */
77a980dc
JB		 4536 if (unlikely(local->quiescing || local->suspended))
4537 goto drop;
89c3a8ac 4538
04800ada
AN		 4539 /* We might be during a HW reconfig, prevent Rx for the same reason */
4540 if (unlikely(local->in_reconfig))
4541 goto drop;
4542
ea77f12f
JB		 4543 /*
4544 * The same happens when we're not even started,
4545 * but that's worth a warning.
4546 */
77a980dc
JB		 4547 if (WARN_ON(!local->started))
4548 goto drop;
ea77f12f 4549
fc885189 4550 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 4551 /*
fc885189
JB		 4552 * Validate the rate, unless a PLCP error means that
4553 * we probably can't have a valid rate here anyway.
e5d6eb83 4554 */
fc885189 4555
da6a4352
JB		 4556 switch (status->encoding) {
4557 case RX_ENC_HT:
fc885189
JB		 4558 /*
4559 * rate_idx is MCS index, which can be [0-76]
4560 * as documented on:
4561 *
4562 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4563 *
4564 * Anything else would be some sort of driver or
4565 * hardware error. The driver should catch hardware
4566 * errors.
4567 */
444e3803 4568 if (WARN(status->rate_idx > 76,
fc885189
JB		 4569 "Rate marked as an HT rate but passed "
4570 "status->rate_idx is not "
4571 "an MCS index [0-76]: %d (0x%02x)\n",
4572 status->rate_idx,
4573 status->rate_idx))
4574 goto drop;
da6a4352
JB		 4575 break;
4576 case RX_ENC_VHT:
5614618e 4577 if (WARN_ONCE(status->rate_idx > 9 ||
8613c948
JB		 4578 !status->nss ||
4579 status->nss > 8,
5614618e 4580 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
8613c948 4581 status->rate_idx, status->nss))
5614618e 4582 goto drop;
da6a4352 4583 break;
41cbb0f5
LC		 4584 case RX_ENC_HE:
4585 if (WARN_ONCE(status->rate_idx > 11 ||
4586 !status->nss ||
4587 status->nss > 8,
4588 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4589 status->rate_idx, status->nss))
4590 goto drop;
4591 break;
da6a4352
JB		 4592 default:
4593 WARN_ON_ONCE(1);
4594 /* fall through */
4595 case RX_ENC_LEGACY:
444e3803 4596 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 4597 goto drop;
4598 rate = &sband->bitrates[status->rate_idx];
4599 }
0fb8ca45 4600 }
6368e4b1 4601
554891e6
JB		 4602 status->rx_flags = 0;
4603
6368e4b1
RR		 4604 /*
4605 * key references and virtual interfaces are protected using RCU
4606 * and this requires that we are in a read-side RCU section during
4607 * receive processing
4608 */
4609 rcu_read_lock();
4610
4611 /*
4612 * Frames with failed FCS/PLCP checksum are not returned,
4613 * all other frames are returned without radiotap header
4614 * if it was previously present.
4615 * Also, frames with less than 16 bytes are dropped.
4616 */
f1d58c25 4617 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 4618 if (!skb) {
4619 rcu_read_unlock();
4620 return;
4621 }
4622
e1e54068
JB		 4623 ieee80211_tpt_led_trig_rx(local,
4624 ((struct ieee80211_hdr *)skb->data)->frame_control,
4625 skb->len);
d63b548f
JB		 4626
4627 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
6368e4b1
RR		 4628
4629 rcu_read_unlock();
77a980dc
JB		 4630
4631 return;
4632 drop:
4633 kfree_skb(skb);
6368e4b1 4634}
af9f9b22 4635EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 4636
4637/* This is a version of the rx handler that can be called from hard irq
4638 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 4639void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 4640{
4641 struct ieee80211_local *local = hw_to_local(hw);
4642
4643 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4644
571ecf67
JB		 4645 skb->pkt_type = IEEE80211_RX_MSG;
4646 skb_queue_tail(&local->skb_queue, skb);
4647 tasklet_schedule(&local->tasklet);
4648}
4649EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)