]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blame - net/mac80211/rx.c
projects / mirror_ubuntu-jammy-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
mac80211: IEEE 802.11 Extended Key ID support
[mirror_ubuntu-jammy-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
b7540d8f 7 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
c15353be 8 * Copyright (C) 2018-2019 Intel Corporation
571ecf67
JB		 9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
ab46623e 15#include <linux/jiffies.h>
5a0e3ad6 16#include <linux/slab.h>
571ecf67
JB		 17#include <linux/kernel.h>
18#include <linux/skbuff.h>
19#include <linux/netdevice.h>
20#include <linux/etherdevice.h>
d4e46a3d 21#include <linux/rcupdate.h>
bc3b2d7f 22#include <linux/export.h>
06470f74 23#include <linux/bitops.h>
571ecf67
JB		 24#include <net/mac80211.h>
25#include <net/ieee80211_radiotap.h>
d26ad377 26#include <asm/unaligned.h>
571ecf67
JB		 27
28#include "ieee80211_i.h"
24487981 29#include "driver-ops.h"
2c8dccc7 30#include "led.h"
33b64eb2 31#include "mesh.h"
571ecf67
JB		 32#include "wep.h"
33#include "wpa.h"
34#include "tkip.h"
35#include "wme.h"
1d8d3dec 36#include "rate.h"
571ecf67 37
5a490510
JB		 38static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
39{
40 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
41
42 u64_stats_update_begin(&tstats->syncp);
43 tstats->rx_packets++;
44 tstats->rx_bytes += len;
45 u64_stats_update_end(&tstats->syncp);
46}
47
a6828493
JB		 48static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49 enum nl80211_iftype type)
50{
51 __le16 fc = hdr->frame_control;
52
53 if (ieee80211_is_data(fc)) {
54 if (len < 24) /* drop incorrect hdr len (data) */
55 return NULL;
56
57 if (ieee80211_has_a4(fc))
58 return NULL;
59 if (ieee80211_has_tods(fc))
60 return hdr->addr1;
61 if (ieee80211_has_fromds(fc))
62 return hdr->addr2;
63
64 return hdr->addr3;
65 }
66
67 if (ieee80211_is_mgmt(fc)) {
68 if (len < 24) /* drop incorrect hdr len (mgmt) */
69 return NULL;
70 return hdr->addr3;
71 }
72
73 if (ieee80211_is_ctl(fc)) {
74 if (ieee80211_is_pspoll(fc))
75 return hdr->addr1;
76
77 if (ieee80211_is_back_req(fc)) {
78 switch (type) {
79 case NL80211_IFTYPE_STATION:
80 return hdr->addr2;
81 case NL80211_IFTYPE_AP:
82 case NL80211_IFTYPE_AP_VLAN:
83 return hdr->addr1;
84 default:
85 break; /* fall through to the return */
86 }
87 }
88 }
89
90 return NULL;
91}
92
b2e7771e
JB		 93/*
94 * monitor mode reception
95 *
96 * This function cleans up the SKB, i.e. it removes all the stuff
97 * only useful for monitoring.
98 */
30841f5c
JB		 99static void remove_monitor_info(struct sk_buff *skb,
100 unsigned int present_fcs_len,
c096b92a 101 unsigned int rtap_space)
b2e7771e 102{
30841f5c
JB		 103 if (present_fcs_len)
104 __pskb_trim(skb, skb->len - present_fcs_len);
c096b92a 105 __pskb_pull(skb, rtap_space);
b2e7771e
JB		 106}
107
1f7bba79 108static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
c096b92a 109 unsigned int rtap_space)
b2e7771e 110{
f1d58c25 111 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 112 struct ieee80211_hdr *hdr;
113
c096b92a 114 hdr = (void *)(skb->data + rtap_space);
b2e7771e 115
4c298677 116 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
17883048 117 RX_FLAG_FAILED_PLCP_CRC |
c3d1f875
ST		 118 RX_FLAG_ONLY_MONITOR |
119 RX_FLAG_NO_PSDU))
6b59db7d
ZG		 120 return true;
121
c096b92a 122 if (unlikely(skb->len < 16 + present_fcs_len + rtap_space))
6b59db7d
ZG		 123 return true;
124
87228f57
HH		 125 if (ieee80211_is_ctl(hdr->frame_control) &&
126 !ieee80211_is_pspoll(hdr->frame_control) &&
127 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 128 return true;
129
130 return false;
b2e7771e
JB		 131}
132
601ae7f2 133static int
1f7bba79
JB		 134ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
135 struct ieee80211_rx_status *status,
136 struct sk_buff *skb)
601ae7f2
BR		 137{
138 int len;
139
140 /* always present fields */
a144f378 141 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 142
a144f378 143 /* allocate extra bitmaps */
a144f378
JB		 144 if (status->chains)
145 len += 4 * hweight8(status->chains);
efc38dd7
JB		 146 /* vendor presence bitmap */
147 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
148 len += 4;
90b9e446
JB		 149
150 if (ieee80211_have_rx_timestamp(status)) {
151 len = ALIGN(len, 8);
601ae7f2 152 len += 8;
90b9e446 153 }
30686bf7 154 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 155 len += 1;
601ae7f2 156
a144f378
JB		 157 /* antenna field, if we don't have per-chain info */
158 if (!status->chains)
159 len += 1;
160
90b9e446
JB		 161 /* padding for RX_FLAGS if necessary */
162 len = ALIGN(len, 2);
601ae7f2 163
da6a4352 164 if (status->encoding == RX_ENC_HT) /* HT info */
6d744bac
JB		 165 len += 3;
166
4c298677 167 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 168 len = ALIGN(len, 4);
4c298677
JB		 169 len += 8;
170 }
171
da6a4352 172 if (status->encoding == RX_ENC_VHT) {
51648921
JB		 173 len = ALIGN(len, 2);
174 len += 12;
175 }
176
99ee7cae
JB		 177 if (local->hw.radiotap_timestamp.units_pos >= 0) {
178 len = ALIGN(len, 8);
179 len += 12;
180 }
181
41cbb0f5
LC		 182 if (status->encoding == RX_ENC_HE &&
183 status->flag & RX_FLAG_RADIOTAP_HE) {
184 len = ALIGN(len, 2);
185 len += 12;
186 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12);
187 }
188
189 if (status->encoding == RX_ENC_HE &&
190 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
191 len = ALIGN(len, 2);
192 len += 12;
193 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);
194 }
195
c3d1f875
ST		 196 if (status->flag & RX_FLAG_NO_PSDU)
197 len += 1;
198
d1332e7b
ST		 199 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
200 len = ALIGN(len, 2);
201 len += 4;
202 BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);
203 }
204
a144f378
JB		 205 if (status->chains) {
206 /* antenna and antenna signal fields */
207 len += 2 * hweight8(status->chains);
208 }
209
1f7bba79 210 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
c15353be
LK		 211 struct ieee80211_vendor_radiotap *rtap;
212 int vendor_data_offset = 0;
213
214 /*
215 * The position to look at depends on the existence (or non-
216 * existence) of other elements, so take that into account...
217 */
218 if (status->flag & RX_FLAG_RADIOTAP_HE)
219 vendor_data_offset +=
220 sizeof(struct ieee80211_radiotap_he);
221 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
222 vendor_data_offset +=
223 sizeof(struct ieee80211_radiotap_he_mu);
224 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
225 vendor_data_offset +=
226 sizeof(struct ieee80211_radiotap_lsig);
227
228 rtap = (void *)&skb->data[vendor_data_offset];
1f7bba79 229
1f7bba79
JB		 230 /* alignment for fixed 6-byte vendor data header */
231 len = ALIGN(len, 2);
232 /* vendor data header */
233 len += 6;
234 if (WARN_ON(rtap->align == 0))
235 rtap->align = 1;
236 len = ALIGN(len, rtap->align);
237 len += rtap->len + rtap->pad;
238 }
239
601ae7f2
BR		 240 return len;
241}
242
9e478066
JB		 243static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
244 struct sk_buff *skb,
c096b92a 245 int rtap_space)
9e478066
JB		 246{
247 struct {
248 struct ieee80211_hdr_3addr hdr;
249 u8 category;
250 u8 action_code;
7c53eb5d 251 } __packed __aligned(2) action;
9e478066
JB		 252
253 if (!sdata)
254 return;
255
256 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
257
c096b92a 258 if (skb->len < rtap_space + sizeof(action) +
9e478066
JB		 259 VHT_MUMIMO_GROUPS_DATA_LEN)
260 return;
261
262 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
263 return;
264
c096b92a 265 skb_copy_bits(skb, rtap_space, &action, sizeof(action));
9e478066
JB		 266
267 if (!ieee80211_is_action(action.hdr.frame_control))
268 return;
269
270 if (action.category != WLAN_CATEGORY_VHT)
271 return;
272
273 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
274 return;
275
276 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
277 return;
278
279 skb = skb_copy(skb, GFP_ATOMIC);
280 if (!skb)
281 return;
282
9e478066
JB		 283 skb_queue_tail(&sdata->skb_queue, skb);
284 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
285}
286
00ea6deb 287/*
601ae7f2
BR		 288 * ieee80211_add_rx_radiotap_header - add radiotap header
289 *
290 * add a radiotap header containing all the fields which the hardware provided.
291 */
292static void
293ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
294 struct sk_buff *skb,
601ae7f2 295 struct ieee80211_rate *rate,
973ef21a 296 int rtap_len, bool has_fcs)
601ae7f2 297{
f1d58c25 298 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 299 struct ieee80211_radiotap_header *rthdr;
300 unsigned char *pos;
a144f378
JB		 301 __le32 *it_present;
302 u32 it_present_val;
6a86b9c7 303 u16 rx_flags = 0;
a5e70697 304 u16 channel_flags = 0;
a144f378
JB		 305 int mpdulen, chain;
306 unsigned long chains = status->chains;
1f7bba79 307 struct ieee80211_vendor_radiotap rtap = {};
41cbb0f5
LC		 308 struct ieee80211_radiotap_he he = {};
309 struct ieee80211_radiotap_he_mu he_mu = {};
d1332e7b 310 struct ieee80211_radiotap_lsig lsig = {};
41cbb0f5
LC		 311
312 if (status->flag & RX_FLAG_RADIOTAP_HE) {
313 he = *(struct ieee80211_radiotap_he *)skb->data;
314 skb_pull(skb, sizeof(he));
315 WARN_ON_ONCE(status->encoding != RX_ENC_HE);
316 }
317
318 if (status->flag & RX_FLAG_RADIOTAP_HE_MU) {
319 he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data;
320 skb_pull(skb, sizeof(he_mu));
321 }
1f7bba79 322
d1332e7b
ST		 323 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
324 lsig = *(struct ieee80211_radiotap_lsig *)skb->data;
325 skb_pull(skb, sizeof(lsig));
326 }
327
1f7bba79
JB		 328 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
329 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
330 /* rtap.len and rtap.pad are undone immediately */
331 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
332 }
f4bda337
TP		 333
334 mpdulen = skb->len;
30686bf7 335 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 336 mpdulen += FCS_LEN;
601ae7f2 337
d58ff351 338 rthdr = skb_push(skb, rtap_len);
1f7bba79 339 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 340 it_present = &rthdr->it_present;
601ae7f2
BR		 341
342 /* radiotap header, set always present flags */
0059b2b1 343 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 344 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
345 BIT(IEEE80211_RADIOTAP_CHANNEL) |
346 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
347
348 if (!status->chains)
349 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
350
351 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
352 it_present_val |=
353 BIT(IEEE80211_RADIOTAP_EXT) |
354 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
355 put_unaligned_le32(it_present_val, it_present);
356 it_present++;
357 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
358 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
359 }
601ae7f2 360
1f7bba79
JB		 361 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
362 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
363 BIT(IEEE80211_RADIOTAP_EXT);
364 put_unaligned_le32(it_present_val, it_present);
365 it_present++;
366 it_present_val = rtap.present;
367 }
368
a144f378
JB		 369 put_unaligned_le32(it_present_val, it_present);
370
371 pos = (void *)(it_present + 1);
372
601ae7f2
BR		 373 /* the order of the following fields is important */
374
375 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 376 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 377 /* padding */
378 while ((pos - (u8 *)rthdr) & 7)
379 *pos++ = 0;
f4bda337
TP		 380 put_unaligned_le64(
381 ieee80211_calculate_rx_timestamp(local, status,
382 mpdulen, 0),
383 pos);
1df332e8 384 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 385 pos += 8;
386 }
387
388 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 389 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 390 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 391 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
392 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
7fdd69c5 393 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
b4f28bbb 394 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 395 pos++;
396
397 /* IEEE80211_RADIOTAP_RATE */
da6a4352 398 if (!rate || status->encoding != RX_ENC_LEGACY) {
0fb8ca45 399 /*
f8d1ccf1 400 * Without rate information don't add it. If we have,
38f37be2 401 * MCS information is a separate field in radiotap,
73b48099
JB		 402 * added below. The byte here is needed as padding
403 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 404 */
405 *pos = 0;
8d6f658e 406 } else {
2103dec1 407 int shift = 0;
ebe6c7ba 408 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
da6a4352 409 if (status->bw == RATE_INFO_BW_10)
2103dec1 410 shift = 1;
da6a4352 411 else if (status->bw == RATE_INFO_BW_5)
2103dec1
SW		 412 shift = 2;
413 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 414 }
601ae7f2
BR		 415 pos++;
416
417 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 418 put_unaligned_le16(status->freq, pos);
601ae7f2 419 pos += 2;
da6a4352 420 if (status->bw == RATE_INFO_BW_10)
a5e70697 421 channel_flags |= IEEE80211_CHAN_HALF;
da6a4352 422 else if (status->bw == RATE_INFO_BW_5)
a5e70697
SW		 423 channel_flags |= IEEE80211_CHAN_QUARTER;
424
57fbcce3 425 if (status->band == NL80211_BAND_5GHZ)
a5e70697 426 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
da6a4352 427 else if (status->encoding != RX_ENC_LEGACY)
a5e70697 428 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 429 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 430 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 431 else if (rate)
3a5c5e81 432 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 433 else
a5e70697
SW		 434 channel_flags |= IEEE80211_CHAN_2GHZ;
435 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 436 pos += 2;
437
438 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 439 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 440 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 441 *pos = status->signal;
442 rthdr->it_present |=
443 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
444 pos++;
445 }
446
601ae7f2
BR		 447 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
448
a144f378
JB		 449 if (!status->chains) {
450 /* IEEE80211_RADIOTAP_ANTENNA */
451 *pos = status->antenna;
452 pos++;
453 }
601ae7f2 454
601ae7f2
BR		 455 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
456
457 /* IEEE80211_RADIOTAP_RX_FLAGS */
458 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 459 if ((pos - (u8 *)rthdr) & 1)
90b9e446 460 *pos++ = 0;
aae89831 461 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 462 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
463 put_unaligned_le16(rx_flags, pos);
601ae7f2 464 pos += 2;
6d744bac 465
da6a4352 466 if (status->encoding == RX_ENC_HT) {
786677d1
OR		 467 unsigned int stbc;
468
6d744bac 469 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 470 *pos++ = local->hw.radiotap_mcs_details;
6d744bac 471 *pos = 0;
7fdd69c5 472 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
6d744bac 473 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
da6a4352 474 if (status->bw == RATE_INFO_BW_40)
6d744bac 475 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
7fdd69c5 476 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
ac55d2fe 477 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
7fdd69c5 478 if (status->enc_flags & RX_ENC_FLAG_LDPC)
63c361f5 479 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
7fdd69c5 480 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
786677d1 481 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 482 pos++;
483 *pos++ = status->rate_idx;
484 }
4c298677
JB		 485
486 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
487 u16 flags = 0;
488
489 /* ensure 4 byte alignment */
490 while ((pos - (u8 *)rthdr) & 3)
491 pos++;
492 rthdr->it_present |=
493 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
494 put_unaligned_le32(status->ampdu_reference, pos);
495 pos += 4;
4c298677
JB		 496 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
497 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
498 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
499 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
500 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
501 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
502 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
503 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
7299d6f7
JB		 504 if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN)
505 flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN;
506 if (status->flag & RX_FLAG_AMPDU_EOF_BIT)
507 flags |= IEEE80211_RADIOTAP_AMPDU_EOF;
4c298677
JB		 508 put_unaligned_le16(flags, pos);
509 pos += 2;
510 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
511 *pos++ = status->ampdu_delimiter_crc;
512 else
513 *pos++ = 0;
514 *pos++ = 0;
515 }
90b9e446 516
da6a4352 517 if (status->encoding == RX_ENC_VHT) {
51648921
JB		 518 u16 known = local->hw.radiotap_vht_details;
519
520 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 521 put_unaligned_le16(known, pos);
522 pos += 2;
523 /* flags */
7fdd69c5 524 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
51648921 525 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5 526 /* in VHT, STBC is binary */
7fdd69c5 527 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
63c361f5 528 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
7fdd69c5 529 if (status->enc_flags & RX_ENC_FLAG_BF)
fb378c23 530 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 531 pos++;
532 /* bandwidth */
da6a4352
JB		 533 switch (status->bw) {
534 case RATE_INFO_BW_80:
51648921 535 *pos++ = 4;
da6a4352
JB		 536 break;
537 case RATE_INFO_BW_160:
51648921 538 *pos++ = 11;
da6a4352
JB		 539 break;
540 case RATE_INFO_BW_40:
51648921 541 *pos++ = 1;
da6a4352
JB		 542 break;
543 default:
51648921 544 *pos++ = 0;
da6a4352 545 }
51648921 546 /* MCS/NSS */
8613c948 547 *pos = (status->rate_idx << 4) | status->nss;
51648921
JB		 548 pos += 4;
549 /* coding field */
7fdd69c5 550 if (status->enc_flags & RX_ENC_FLAG_LDPC)
63c361f5 551 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 552 pos++;
553 /* group ID */
554 pos++;
555 /* partial_aid */
556 pos += 2;
557 }
558
99ee7cae
JB		 559 if (local->hw.radiotap_timestamp.units_pos >= 0) {
560 u16 accuracy = 0;
561 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
562
563 rthdr->it_present |=
564 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
565
566 /* ensure 8 byte alignment */
567 while ((pos - (u8 *)rthdr) & 7)
568 pos++;
569
570 put_unaligned_le64(status->device_timestamp, pos);
571 pos += sizeof(u64);
572
573 if (local->hw.radiotap_timestamp.accuracy >= 0) {
574 accuracy = local->hw.radiotap_timestamp.accuracy;
575 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
576 }
577 put_unaligned_le16(accuracy, pos);
578 pos += sizeof(u16);
579
580 *pos++ = local->hw.radiotap_timestamp.units_pos;
581 *pos++ = flags;
582 }
583
41cbb0f5
LC		 584 if (status->encoding == RX_ENC_HE &&
585 status->flag & RX_FLAG_RADIOTAP_HE) {
331aead5 586#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
41cbb0f5
LC		 587
588 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) {
589 he.data6 |= HE_PREP(DATA6_NSTS,
590 FIELD_GET(RX_ENC_FLAG_STBC_MASK,
591 status->enc_flags));
592 he.data3 |= HE_PREP(DATA3_STBC, 1);
593 } else {
594 he.data6 |= HE_PREP(DATA6_NSTS, status->nss);
595 }
596
597#define CHECK_GI(s) \
598 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
599 (int)NL80211_RATE_INFO_HE_GI_##s)
600
601 CHECK_GI(0_8);
602 CHECK_GI(1_6);
603 CHECK_GI(3_2);
604
605 he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx);
606 he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm);
607 he.data3 |= HE_PREP(DATA3_CODING,
608 !!(status->enc_flags & RX_ENC_FLAG_LDPC));
609
610 he.data5 |= HE_PREP(DATA5_GI, status->he_gi);
611
612 switch (status->bw) {
613 case RATE_INFO_BW_20:
614 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
615 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
616 break;
617 case RATE_INFO_BW_40:
618 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
619 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
620 break;
621 case RATE_INFO_BW_80:
622 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
623 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
624 break;
625 case RATE_INFO_BW_160:
626 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
627 IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
628 break;
629 case RATE_INFO_BW_HE_RU:
630#define CHECK_RU_ALLOC(s) \
631 BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
632 NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
633
634 CHECK_RU_ALLOC(26);
635 CHECK_RU_ALLOC(52);
636 CHECK_RU_ALLOC(106);
637 CHECK_RU_ALLOC(242);
638 CHECK_RU_ALLOC(484);
639 CHECK_RU_ALLOC(996);
640 CHECK_RU_ALLOC(2x996);
641
642 he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
643 status->he_ru + 4);
644 break;
645 default:
646 WARN_ONCE(1, "Invalid SU BW %d\n", status->bw);
647 }
648
649 /* ensure 2 byte alignment */
650 while ((pos - (u8 *)rthdr) & 1)
651 pos++;
652 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
653 memcpy(pos, &he, sizeof(he));
654 pos += sizeof(he);
655 }
656
657 if (status->encoding == RX_ENC_HE &&
658 status->flag & RX_FLAG_RADIOTAP_HE_MU) {
659 /* ensure 2 byte alignment */
660 while ((pos - (u8 *)rthdr) & 1)
661 pos++;
662 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU);
663 memcpy(pos, &he_mu, sizeof(he_mu));
664 pos += sizeof(he_mu);
665 }
666
c3d1f875
ST		 667 if (status->flag & RX_FLAG_NO_PSDU) {
668 rthdr->it_present |=
669 cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU);
670 *pos++ = status->zero_length_psdu_type;
671 }
672
d1332e7b
ST		 673 if (status->flag & RX_FLAG_RADIOTAP_LSIG) {
674 /* ensure 2 byte alignment */
675 while ((pos - (u8 *)rthdr) & 1)
676 pos++;
677 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);
678 memcpy(pos, &lsig, sizeof(lsig));
679 pos += sizeof(lsig);
680 }
681
a144f378
JB		 682 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
683 *pos++ = status->chain_signal[chain];
684 *pos++ = chain;
685 }
1f7bba79
JB		 686
687 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
688 /* ensure 2 byte alignment for the vendor field as required */
689 if ((pos - (u8 *)rthdr) & 1)
690 *pos++ = 0;
691 *pos++ = rtap.oui[0];
692 *pos++ = rtap.oui[1];
693 *pos++ = rtap.oui[2];
694 *pos++ = rtap.subns;
695 put_unaligned_le16(rtap.len, pos);
696 pos += 2;
697 /* align the actual payload as requested */
698 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
699 *pos++ = 0;
700 /* data (and possible padding) already follows */
701 }
601ae7f2
BR		 702}
703
127f60bf
JB		 704static struct sk_buff *
705ieee80211_make_monitor_skb(struct ieee80211_local *local,
706 struct sk_buff **origskb,
707 struct ieee80211_rate *rate,
c096b92a 708 int rtap_space, bool use_origskb)
127f60bf
JB		 709{
710 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
711 int rt_hdrlen, needed_headroom;
712 struct sk_buff *skb;
713
714 /* room for the radiotap header based on driver features */
715 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
c096b92a 716 needed_headroom = rt_hdrlen - rtap_space;
127f60bf
JB		 717
718 if (use_origskb) {
719 /* only need to expand headroom if necessary */
720 skb = *origskb;
721 *origskb = NULL;
722
723 /*
724 * This shouldn't trigger often because most devices have an
725 * RX header they pull before we get here, and that should
726 * be big enough for our radiotap information. We should
727 * probably export the length to drivers so that we can have
728 * them allocate enough headroom to start with.
729 */
730 if (skb_headroom(skb) < needed_headroom &&
731 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
732 dev_kfree_skb(skb);
733 return NULL;
734 }
735 } else {
736 /*
737 * Need to make a copy and possibly remove radiotap header
738 * and FCS from the original.
739 */
740 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
741
742 if (!skb)
743 return NULL;
744 }
745
746 /* prepend radiotap information */
747 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
748
749 skb_reset_mac_header(skb);
750 skb->ip_summed = CHECKSUM_UNNECESSARY;
751 skb->pkt_type = PACKET_OTHERHOST;
752 skb->protocol = htons(ETH_P_802_2);
753
754 return skb;
755}
756
b2e7771e
JB		 757/*
758 * This function copies a received frame to all monitor interfaces and
759 * returns a cleaned-up SKB that no longer includes the FCS nor the
760 * radiotap header the driver might have added.
761 */
762static struct sk_buff *
763ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 764 struct ieee80211_rate *rate)
b2e7771e 765{
f1d58c25 766 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 767 struct ieee80211_sub_if_data *sdata;
127f60bf 768 struct sk_buff *monskb = NULL;
b2e7771e 769 int present_fcs_len = 0;
c096b92a 770 unsigned int rtap_space = 0;
42bd20d9
AE		 771 struct ieee80211_sub_if_data *monitor_sdata =
772 rcu_dereference(local->monitor_sdata);
127f60bf 773 bool only_monitor = false;
8020919a 774 unsigned int min_head_len;
1f7bba79 775
41cbb0f5
LC		 776 if (status->flag & RX_FLAG_RADIOTAP_HE)
777 rtap_space += sizeof(struct ieee80211_radiotap_he);
778
779 if (status->flag & RX_FLAG_RADIOTAP_HE_MU)
780 rtap_space += sizeof(struct ieee80211_radiotap_he_mu);
781
d359bbce
IP		 782 if (status->flag & RX_FLAG_RADIOTAP_LSIG)
783 rtap_space += sizeof(struct ieee80211_radiotap_lsig);
784
1f7bba79 785 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
d359bbce
IP		 786 struct ieee80211_vendor_radiotap *rtap =
787 (void *)(origskb->data + rtap_space);
1f7bba79 788
c096b92a 789 rtap_space += sizeof(*rtap) + rtap->len + rtap->pad;
1f7bba79 790 }
b2e7771e 791
8020919a
IP		 792 min_head_len = rtap_space;
793
b2e7771e
JB		 794 /*
795 * First, we may need to make a copy of the skb because
796 * (1) we need to modify it for radiotap (if not present), and
797 * (2) the other RX handlers will modify the skb we got.
798 *
799 * We don't need to, of course, if we aren't going to return
800 * the SKB because it has a bad FCS/PLCP checksum.
801 */
0869aea0 802
8020919a
IP		 803 if (!(status->flag & RX_FLAG_NO_PSDU)) {
804 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
805 if (unlikely(origskb->len <= FCS_LEN + rtap_space)) {
806 /* driver bug */
807 WARN_ON(1);
808 dev_kfree_skb(origskb);
809 return NULL;
810 }
811 present_fcs_len = FCS_LEN;
30841f5c 812 }
8020919a
IP		 813
814 /* also consider the hdr->frame_control */
815 min_head_len += 2;
30841f5c 816 }
b2e7771e 817
8020919a
IP		 818 /* ensure that the expected data elements are in skb head */
819 if (!pskb_may_pull(origskb, min_head_len)) {
e3cf8b3f
ZY		 820 dev_kfree_skb(origskb);
821 return NULL;
822 }
823
c096b92a 824 only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space);
127f60bf 825
17883048 826 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
127f60bf 827 if (only_monitor) {
b2e7771e
JB		 828 dev_kfree_skb(origskb);
829 return NULL;
830 }
831
c096b92a 832 remove_monitor_info(origskb, present_fcs_len, rtap_space);
30841f5c 833 return origskb;
b2e7771e
JB		 834 }
835
c096b92a 836 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space);
9e478066 837
f64331d5 838 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
127f60bf
JB		 839 bool last_monitor = list_is_last(&sdata->u.mntr.list,
840 &local->mon_list);
841
842 if (!monskb)
843 monskb = ieee80211_make_monitor_skb(local, &origskb,
c096b92a 844 rate, rtap_space,
127f60bf
JB		 845 only_monitor &&
846 last_monitor);
847
848 if (monskb) {
849 struct sk_buff *skb;
850
851 if (last_monitor) {
852 skb = monskb;
853 monskb = NULL;
854 } else {
855 skb = skb_clone(monskb, GFP_ATOMIC);
856 }
857
858 if (skb) {
859 skb->dev = sdata->dev;
860 ieee80211_rx_stats(skb->dev, skb->len);
861 netif_receive_skb(skb);
b2e7771e
JB		 862 }
863 }
864
127f60bf
JB		 865 if (last_monitor)
866 break;
b2e7771e
JB		 867 }
868
127f60bf
JB		 869 /* this happens if last_monitor was erroneously false */
870 dev_kfree_skb(monskb);
871
872 /* ditto */
873 if (!origskb)
874 return NULL;
b2e7771e 875
c096b92a 876 remove_monitor_info(origskb, present_fcs_len, rtap_space);
b2e7771e
JB		 877 return origskb;
878}
879
5cf121c3 880static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 881{
238f74a2 882 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 883 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 884 int tid, seqno_idx, security_idx;
6e0d114d
JB		 885
886 /* does the frame have a qos control field? */
238f74a2
HH		 887 if (ieee80211_is_data_qos(hdr->frame_control)) {
888 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 889 /* frame has qos control */
238f74a2 890 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 891 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 892 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 893
894 seqno_idx = tid;
895 security_idx = tid;
6e0d114d 896 } else {
1411f9b5
JB		 897 /*
898 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
899 *
900 * Sequence numbers for management frames, QoS data
901 * frames with a broadcast/multicast address in the
902 * Address 1 field, and all non-QoS data frames sent
903 * by QoS STAs are assigned using an additional single
904 * modulo-4096 counter, [...]
905 *
906 * We also use that counter for non-QoS STAs.
907 */
5a306f58 908 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 909 security_idx = 0;
910 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 911 security_idx = IEEE80211_NUM_TIDS;
9e26297a 912 tid = 0;
6e0d114d 913 }
52865dfd 914
9e26297a
JB		 915 rx->seqno_idx = seqno_idx;
916 rx->security_idx = security_idx;
6e0d114d
JB		 917 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
918 * For now, set skb->priority to 0 for other cases. */
919 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 920}
6e0d114d 921
d1c3a37c
JB		 922/**
923 * DOC: Packet alignment
924 *
925 * Drivers always need to pass packets that are aligned to two-byte boundaries
926 * to the stack.
927 *
928 * Additionally, should, if possible, align the payload data in a way that
929 * guarantees that the contained IP header is aligned to a four-byte
930 * boundary. In the case of regular frames, this simply means aligning the
931 * payload to a four-byte boundary (because either the IP header is directly
932 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 933 * in front of it). If the payload data is not properly aligned and the
934 * architecture doesn't support efficient unaligned operations, mac80211
935 * will align the data.
d1c3a37c
JB		 936 *
937 * With A-MSDU frames, however, the payload data address must yield two modulo
938 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
939 * push the IP header further back to a multiple of four again. Thankfully, the
940 * specs were sane enough this time around to require padding each A-MSDU
941 * subframe to a length that is a multiple of four.
942 *
25985edc 943 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 944 * the payload is not supported, the driver is required to move the 802.11
945 * header to be directly in front of the payload in that case.
946 */
947static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 948{
59d9cb07 949#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 950 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 951#endif
6e0d114d
JB		 952}
953
6368e4b1 954
571ecf67
JB		 955/* rx handlers */
956
3cfcf6ac
JM		 957static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
958{
959 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
960
d8ca16db 961 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 962 return 0;
963
d8ca16db 964 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 965}
966
967
968static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
969{
970 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
971
d8ca16db 972 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 973 return 0;
974
d8ca16db 975 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 976}
977
978
979/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
980static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
981{
982 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
983 struct ieee80211_mmie *mmie;
56c52da2 984 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 985
1df332e8 986 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 987 return -1;
988
d8ca16db 989 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 990 return -1; /* not a robust management frame */
991
992 mmie = (struct ieee80211_mmie *)
993 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 994 if (mmie->element_id == WLAN_EID_MMIE &&
995 mmie->length == sizeof(*mmie) - 2)
996 return le16_to_cpu(mmie->key_id);
997
998 mmie16 = (struct ieee80211_mmie_16 *)
999 (skb->data + skb->len - sizeof(*mmie16));
1000 if (skb->len >= 24 + sizeof(*mmie16) &&
1001 mmie16->element_id == WLAN_EID_MMIE &&
1002 mmie16->length == sizeof(*mmie16) - 2)
1003 return le16_to_cpu(mmie16->key_id);
1004
1005 return -1;
3cfcf6ac
JM		 1006}
1007
96fc6efb
AW		 1008static int ieee80211_get_keyid(struct sk_buff *skb,
1009 const struct ieee80211_cipher_scheme *cs)
2475b1cc
MS		 1010{
1011 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1012 __le16 fc;
1013 int hdrlen;
96fc6efb
AW		 1014 int minlen;
1015 u8 key_idx_off;
1016 u8 key_idx_shift;
2475b1cc
MS		 1017 u8 keyid;
1018
1019 fc = hdr->frame_control;
1020 hdrlen = ieee80211_hdrlen(fc);
1021
96fc6efb
AW		 1022 if (cs) {
1023 minlen = hdrlen + cs->hdr_len;
1024 key_idx_off = hdrlen + cs->key_idx_off;
1025 key_idx_shift = cs->key_idx_shift;
1026 } else {
1027 /* WEP, TKIP, CCMP and GCMP */
1028 minlen = hdrlen + IEEE80211_WEP_IV_LEN;
1029 key_idx_off = hdrlen + 3;
1030 key_idx_shift = 6;
1031 }
1032
1033 if (unlikely(skb->len < minlen))
2475b1cc
MS		 1034 return -EINVAL;
1035
96fc6efb
AW		 1036 skb_copy_bits(skb, key_idx_off, &keyid, 1);
1037
1038 if (cs)
1039 keyid &= cs->key_idx_mask;
1040 keyid >>= key_idx_shift;
1041
1042 /* cs could use more than the usual two bits for the keyid */
1043 if (unlikely(keyid >= NUM_DEFAULT_KEYS))
1044 return -EINVAL;
2475b1cc
MS		 1045
1046 return keyid;
1047}
1048
1df332e8 1049static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 1050{
a7767f95 1051 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 1052 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 1053
a7767f95 1054 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 1055 if (is_multicast_ether_addr(hdr->addr1)) {
1056 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 1057 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 1058 return RX_DROP_MONITOR;
b203ca39 1059 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 1060 return RX_DROP_MONITOR;
1061 } else {
1062 if (!ieee80211_has_a4(hdr->frame_control))
1063 return RX_DROP_MONITOR;
b203ca39 1064 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 1065 return RX_DROP_MONITOR;
1066 }
33b64eb2
LCC		 1067 }
1068
1069 /* If there is not an established peer link and this is not a peer link
1070 * establisment frame, beacon or probe, drop the frame.
1071 */
1072
57cf8043 1073 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 1074 struct ieee80211_mgmt *mgmt;
d6d1a5a7 1075
a7767f95 1076 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 1077 return RX_DROP_MONITOR;
1078
a7767f95 1079 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 1080 u8 category;
9b395bc3
JB		 1081
1082 /* make sure category field is present */
1083 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
1084 return RX_DROP_MONITOR;
1085
33b64eb2 1086 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 1087 category = mgmt->u.action.category;
1088 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 1089 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 1090 return RX_DROP_MONITOR;
33b64eb2 1091 return RX_CONTINUE;
33b64eb2
LCC		 1092 }
1093
a7767f95
HH		 1094 if (ieee80211_is_probe_req(hdr->frame_control) ||
1095 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 1096 ieee80211_is_beacon(hdr->frame_control) ||
1097 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 1098 return RX_CONTINUE;
1099
1100 return RX_DROP_MONITOR;
a7767f95
HH		 1101 }
1102
902acc78
JB		 1103 return RX_CONTINUE;
1104}
33b64eb2 1105
fb4ea054
JB		 1106static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
1107 int index)
1108{
1109 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
1110 struct sk_buff *tail = skb_peek_tail(frames);
1111 struct ieee80211_rx_status *status;
1112
06470f74
SS		 1113 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
1114 return true;
1115
fb4ea054
JB		 1116 if (!tail)
1117 return false;
1118
1119 status = IEEE80211_SKB_RXCB(tail);
1120 if (status->flag & RX_FLAG_AMSDU_MORE)
1121 return false;
1122
1123 return true;
1124}
1125
d3b2fb53 1126static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 1127 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1128 int index,
1129 struct sk_buff_head *frames)
1edfb1af 1130{
83eb935e
MK		 1131 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
1132 struct sk_buff *skb;
4cfda47b 1133 struct ieee80211_rx_status *status;
1edfb1af 1134
dd318575
JB		 1135 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1136
83eb935e 1137 if (skb_queue_empty(skb_list))
1edfb1af
JB		 1138 goto no_frame;
1139
fb4ea054 1140 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
83eb935e
MK		 1141 __skb_queue_purge(skb_list);
1142 goto no_frame;
1143 }
1144
1145 /* release frames from the reorder ring buffer */
1edfb1af 1146 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 1147 while ((skb = __skb_dequeue(skb_list))) {
1148 status = IEEE80211_SKB_RXCB(skb);
1149 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
1150 __skb_queue_tail(frames, skb);
1151 }
1edfb1af
JB		 1152
1153no_frame:
06470f74 1154 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
9a886586 1155 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 1156}
1157
d3b2fb53 1158static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 1159 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1160 u16 head_seq_num,
1161 struct sk_buff_head *frames)
1edfb1af
JB		 1162{
1163 int index;
1164
dd318575
JB		 1165 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1166
9a886586 1167 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 1168 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 1169 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1170 frames);
1edfb1af
JB		 1171 }
1172}
1173
1174/*
1175 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
1176 * the skb was added to the buffer longer than this time ago, the earlier
1177 * frames that have not yet been received are assumed to be lost and the skb
1178 * can be released for processing. This may also release other skb's from the
1179 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 1180 *
1181 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 1182 */
1183#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
1184
d3b2fb53 1185static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 1186 struct tid_ampdu_rx *tid_agg_rx,
1187 struct sk_buff_head *frames)
aa0c8636 1188{
83eb935e 1189 int index, i, j;
aa0c8636 1190
dd318575
JB		 1191 lockdep_assert_held(&tid_agg_rx->reorder_lock);
1192
aa0c8636 1193 /* release the buffer until next missing frame */
2e3049b7 1194 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
fb4ea054 1195 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
07ae2dfc 1196 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 1197 /*
1198 * No buffers ready to be released, but check whether any
1199 * frames in the reorder buffer have timed out.
1200 */
aa0c8636
CL		 1201 int skipped = 1;
1202 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1203 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 1204 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
aa0c8636
CL		 1205 skipped++;
1206 continue;
1207 }
499fe9a4
DH		 1208 if (skipped &&
1209 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 1210 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 1211 goto set_release_timer;
aa0c8636 1212
83eb935e
MK		 1213 /* don't leave incomplete A-MSDUs around */
1214 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1215 i = (i + 1) % tid_agg_rx->buf_size)
1216 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1217
bdcbd8e0
JB		 1218 ht_dbg_ratelimited(sdata,
1219 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 1220 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1221 frames);
aa0c8636
CL		 1222
1223 /*
1224 * Increment the head seq# also for the skipped slots.
1225 */
1226 tid_agg_rx->head_seq_num =
9a886586
JB		 1227 (tid_agg_rx->head_seq_num +
1228 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 1229 skipped = 0;
1230 }
fb4ea054 1231 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
f9e124fb
CL		 1232 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1233 frames);
2e3049b7 1234 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 1235 }
2bff8ebf
CL		 1236
1237 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 1238 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 1239
1240 for (; j != (index - 1) % tid_agg_rx->buf_size;
1241 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 1242 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
2bff8ebf
CL		 1243 break;
1244 }
1245
1246 set_release_timer:
1247
788211d8
JB		 1248 if (!tid_agg_rx->removed)
1249 mod_timer(&tid_agg_rx->reorder_timer,
1250 tid_agg_rx->reorder_time[j] + 1 +
1251 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 1252 } else {
1253 del_timer(&tid_agg_rx->reorder_timer);
1254 }
aa0c8636
CL		 1255}
1256
1edfb1af
JB		 1257/*
1258 * As this function belongs to the RX path it must be under
1259 * rcu_read_lock protection. It returns false if the frame
1260 * can be processed immediately, true if it was consumed.
1261 */
d3b2fb53 1262static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 1263 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1264 struct sk_buff *skb,
1265 struct sk_buff_head *frames)
1edfb1af
JB		 1266{
1267 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 1268 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 1269 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1270 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1271 u16 head_seq_num, buf_size;
1272 int index;
2bff8ebf 1273 bool ret = true;
1edfb1af 1274
dd318575
JB		 1275 spin_lock(&tid_agg_rx->reorder_lock);
1276
4549cf2b
MK		 1277 /*
1278 * Offloaded BA sessions have no known starting sequence number so pick
1279 * one from first Rxed frame for this tid after BA was started.
1280 */
1281 if (unlikely(tid_agg_rx->auto_seq)) {
1282 tid_agg_rx->auto_seq = false;
1283 tid_agg_rx->ssn = mpdu_seq_num;
1284 tid_agg_rx->head_seq_num = mpdu_seq_num;
1285 }
1286
1edfb1af
JB		 1287 buf_size = tid_agg_rx->buf_size;
1288 head_seq_num = tid_agg_rx->head_seq_num;
1289
b7540d8f
SS		 1290 /*
1291 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1292 * be reordered.
1293 */
1294 if (unlikely(!tid_agg_rx->started)) {
1295 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1296 ret = false;
1297 goto out;
1298 }
1299 tid_agg_rx->started = true;
1300 }
1301
1edfb1af 1302 /* frame with out of date sequence number */
9a886586 1303 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 1304 dev_kfree_skb(skb);
2bff8ebf 1305 goto out;
1edfb1af
JB		 1306 }
1307
1308 /*
1309 * If frame the sequence number exceeds our buffering window
1310 * size release some previous frames to make room for this one.
1311 */
9a886586
JB		 1312 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1313 head_seq_num = ieee80211_sn_inc(
1314 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 1315 /* release stored frames up to new head to stack */
d3b2fb53 1316 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 1317 head_seq_num, frames);
1edfb1af
JB		 1318 }
1319
1320 /* Now the new frame is always in the range of the reordering buffer */
1321
2e3049b7 1322 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 1323
1324 /* check if we already stored this frame */
fb4ea054 1325 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1edfb1af 1326 dev_kfree_skb(skb);
2bff8ebf 1327 goto out;
1edfb1af
JB		 1328 }
1329
1330 /*
1331 * If the current MPDU is in the right order and nothing else
1332 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 1333 * If it is first but there's something stored, we may be able
1334 * to release frames after this one.
1edfb1af
JB		 1335 */
1336 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1337 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1338 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1339 tid_agg_rx->head_seq_num =
1340 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1341 ret = false;
1342 goto out;
1edfb1af
JB		 1343 }
1344
1345 /* put the frame in the reordering buffer */
83eb935e
MK		 1346 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1347 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1348 tid_agg_rx->reorder_time[index] = jiffies;
1349 tid_agg_rx->stored_mpdu_num++;
1350 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1351 }
1edfb1af 1352
2bff8ebf
CL		 1353 out:
1354 spin_unlock(&tid_agg_rx->reorder_lock);
1355 return ret;
1edfb1af
JB		 1356}
1357
1358/*
1359 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1360 * true if the MPDU was buffered, false if it should be processed.
1361 */
f9e124fb
CL		 1362static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1363 struct sk_buff_head *frames)
1edfb1af 1364{
2569a826
JB		 1365 struct sk_buff *skb = rx->skb;
1366 struct ieee80211_local *local = rx->local;
1edfb1af 1367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1368 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1369 struct tid_ampdu_rx *tid_agg_rx;
1370 u16 sc;
6cc00d54 1371 u8 tid, ack_policy;
1edfb1af 1372
051a41fa
JB		 1373 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1374 is_multicast_ether_addr(hdr->addr1))
2569a826 1375 goto dont_reorder;
1edfb1af
JB		 1376
1377 /*
1378 * filter the QoS data rx stream according to
1379 * STA/TID and check if this STA/TID is on aggregation
1380 */
1381
1edfb1af 1382 if (!sta)
2569a826 1383 goto dont_reorder;
1edfb1af 1384
6cc00d54
TP		 1385 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1386 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
a1f2ba04 1387 tid = ieee80211_get_tid(hdr);
1edfb1af 1388
a87f736d 1389 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
bfe40fa3
JB		 1390 if (!tid_agg_rx) {
1391 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1392 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1393 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1394 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1395 WLAN_BACK_RECIPIENT,
1396 WLAN_REASON_QSTA_REQUIRE_SETUP);
a87f736d 1397 goto dont_reorder;
bfe40fa3 1398 }
1edfb1af
JB		 1399
1400 /* qos null data frames are excluded */
1401 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1402 goto dont_reorder;
1edfb1af 1403
6cc00d54
TP		 1404 /* not part of a BA session */
1405 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1406 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1407 goto dont_reorder;
1408
1edfb1af
JB		 1409 /* new, potentially un-ordered, ampdu frame - process it */
1410
1411 /* reset session timer */
1412 if (tid_agg_rx->timeout)
12d3952f 1413 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1414
1415 /* if this mpdu is fragmented - terminate rx aggregation session */
1416 sc = le16_to_cpu(hdr->seq_ctrl);
1417 if (sc & IEEE80211_SCTL_FRAG) {
344eec67
JB		 1418 skb_queue_tail(&rx->sdata->skb_queue, skb);
1419 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1420 return;
1edfb1af
JB		 1421 }
1422
a87f736d
JB		 1423 /*
1424 * No locking needed -- we will only ever process one
1425 * RX packet at a time, and thus own tid_agg_rx. All
1426 * other code manipulating it needs to (and does) make
1427 * sure that we cannot get to it any more before doing
1428 * anything with it.
1429 */
f9e124fb
CL		 1430 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1431 frames))
2569a826
JB		 1432 return;
1433
1434 dont_reorder:
f9e124fb 1435 __skb_queue_tail(frames, skb);
1edfb1af 1436}
33b64eb2 1437
49461622 1438static ieee80211_rx_result debug_noinline
0395442a 1439ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1440{
a7767f95 1441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1442 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1443
f9cfa5f3
SS		 1444 if (status->flag & RX_FLAG_DUP_VALIDATED)
1445 return RX_CONTINUE;
1446
6b0f3274
JB		 1447 /*
1448 * Drop duplicate 802.11 retransmissions
1449 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1450 */
0395442a
JB		 1451
1452 if (rx->skb->len < 24)
1453 return RX_CONTINUE;
1454
1455 if (ieee80211_is_ctl(hdr->frame_control) ||
990d7184 1456 ieee80211_is_nullfunc(hdr->frame_control) ||
0395442a
JB		 1457 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1458 is_multicast_ether_addr(hdr->addr1))
1459 return RX_CONTINUE;
1460
a732fa70
JB		 1461 if (!rx->sta)
1462 return RX_CONTINUE;
1463
1464 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1465 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1466 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1467 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1468 return RX_DROP_UNUSABLE;
1469 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1470 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1471 }
1472
0395442a
JB		 1473 return RX_CONTINUE;
1474}
1475
1476static ieee80211_rx_result debug_noinline
1477ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1478{
1479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1480
571ecf67
JB		 1481 /* Drop disallowed frame classes based on STA auth/assoc state;
1482 * IEEE 802.11, Chap 5.5.
1483 *
ccd7b362
JB		 1484 * mac80211 filters only based on association state, i.e. it drops
1485 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1486 * deauth/disassoc frames when needed. In addition, hostapd is
1487 * responsible for filtering on both auth and assoc states.
1488 */
33b64eb2 1489
902acc78 1490 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1491 return ieee80211_rx_mesh_check(rx);
33b64eb2 1492
a7767f95
HH		 1493 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1494 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1495 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1496 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1497 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1498 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1499 /*
1500 * accept port control frames from the AP even when it's not
1501 * yet marked ASSOC to prevent a race where we don't set the
1502 * assoc bit quickly enough before it sends the first frame
1503 */
1504 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1505 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1506 unsigned int hdrlen;
1507 __be16 ethertype;
1508
1509 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1510
1511 if (rx->skb->len < hdrlen + 8)
1512 return RX_DROP_MONITOR;
1513
1514 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1515 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1516 return RX_CONTINUE;
1517 }
21fc7560
JB		 1518
1519 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1520 cfg80211_rx_spurious_frame(rx->sdata->dev,
1521 hdr->addr2,
1522 GFP_ATOMIC))
1523 return RX_DROP_UNUSABLE;
1524
e4c26add 1525 return RX_DROP_MONITOR;
2a33bee2 1526 }
571ecf67 1527
9ae54c84 1528 return RX_CONTINUE;
570bd537
JB		 1529}
1530
1531
572e0012
KV		 1532static ieee80211_rx_result debug_noinline
1533ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1534{
1535 struct ieee80211_local *local;
1536 struct ieee80211_hdr *hdr;
1537 struct sk_buff *skb;
1538
1539 local = rx->local;
1540 skb = rx->skb;
1541 hdr = (struct ieee80211_hdr *) skb->data;
1542
1543 if (!local->pspolling)
1544 return RX_CONTINUE;
1545
1546 if (!ieee80211_has_fromds(hdr->frame_control))
1547 /* this is not from AP */
1548 return RX_CONTINUE;
1549
1550 if (!ieee80211_is_data(hdr->frame_control))
1551 return RX_CONTINUE;
1552
1553 if (!ieee80211_has_moredata(hdr->frame_control)) {
1554 /* AP has no more frames buffered for us */
1555 local->pspolling = false;
1556 return RX_CONTINUE;
1557 }
1558
1559 /* more data bit is set, let's request a new frame from the AP */
1560 ieee80211_send_pspoll(local, rx->sdata);
1561
1562 return RX_CONTINUE;
1563}
1564
d012a605 1565static void sta_ps_start(struct sta_info *sta)
571ecf67 1566{
133b8226 1567 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1568 struct ieee80211_local *local = sdata->local;
d012a605 1569 struct ps_data *ps;
ba8c3d6f 1570 int tid;
0795af57 1571
d012a605
MP		 1572 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1573 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1574 ps = &sdata->bss->ps;
1575 else
1576 return;
1577
1578 atomic_inc(&ps->num_sta_ps);
c2c98fde 1579 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1580 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1581 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1582 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1583 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1584
17c18bf8
JB		 1585 ieee80211_clear_fast_xmit(sta);
1586
ba8c3d6f
FF		 1587 if (!sta->sta.txq[0])
1588 return;
1589
adf8ed01 1590 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
bb42f2d1 1591 if (txq_has_queue(sta->sta.txq[tid]))
ba8c3d6f
FF		 1592 set_bit(tid, &sta->txq_buffered_tids);
1593 else
1594 clear_bit(tid, &sta->txq_buffered_tids);
1595 }
571ecf67
JB		 1596}
1597
d012a605 1598static void sta_ps_end(struct sta_info *sta)
571ecf67 1599{
bdcbd8e0
JB		 1600 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1601 sta->sta.addr, sta->sta.aid);
004c872e 1602
c2c98fde 1603 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1604 /*
1605 * Clear the flag only if the other one is still set
1606 * so that the TX path won't start TX'ing new frames
1607 * directly ... In the case that the driver flag isn't
1608 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1609 */
1610 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1611 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1612 sta->sta.addr, sta->sta.aid);
af818581
JB		 1613 return;
1614 }
1615
5ac2e350
JB		 1616 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1617 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1618 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1619}
1620
cf47161a 1621int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1622{
cf47161a 1623 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1624 bool in_ps;
1625
cf47161a 1626 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1627
1628 /* Don't let the same PS state be set twice */
cf47161a 1629 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1630 if ((start && in_ps) || (!start && !in_ps))
1631 return -EINVAL;
1632
1633 if (start)
cf47161a 1634 sta_ps_start(sta);
d057e5a3 1635 else
cf47161a 1636 sta_ps_end(sta);
d057e5a3
AN		 1637
1638 return 0;
1639}
1640EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1641
46fa38e8
JB		 1642void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1643{
1644 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1645
1646 if (test_sta_flag(sta, WLAN_STA_SP))
1647 return;
1648
1649 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1650 ieee80211_sta_ps_deliver_poll_response(sta);
1651 else
1652 set_sta_flag(sta, WLAN_STA_PSPOLL);
1653}
1654EXPORT_SYMBOL(ieee80211_sta_pspoll);
1655
1656void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1657{
1658 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
731977e9 1659 int ac = ieee80211_ac_from_tid(tid);
46fa38e8
JB		 1660
1661 /*
0aa419ec
EG		 1662 * If this AC is not trigger-enabled do nothing unless the
1663 * driver is calling us after it already checked.
46fa38e8
JB		 1664 *
1665 * NB: This could/should check a separate bitmap of trigger-
1666 * enabled queues, but for now we only implement uAPSD w/o
1667 * TSPEC changes to the ACs, so they're always the same.
1668 */
f438ceb8
EG		 1669 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1670 tid != IEEE80211_NUM_TIDS)
46fa38e8
JB		 1671 return;
1672
1673 /* if we are in a service period, do nothing */
1674 if (test_sta_flag(sta, WLAN_STA_SP))
1675 return;
1676
1677 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1678 ieee80211_sta_ps_deliver_uapsd(sta);
1679 else
1680 set_sta_flag(sta, WLAN_STA_UAPSD);
1681}
1682EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1683
47086fc5
JB		 1684static ieee80211_rx_result debug_noinline
1685ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1686{
1687 struct ieee80211_sub_if_data *sdata = rx->sdata;
1688 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1689 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
47086fc5 1690
5c90067c 1691 if (!rx->sta)
47086fc5
JB		 1692 return RX_CONTINUE;
1693
1694 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1695 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1696 return RX_CONTINUE;
1697
1698 /*
1699 * The device handles station powersave, so don't do anything about
1700 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1701 * it to mac80211 since they're handled.)
1702 */
30686bf7 1703 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1704 return RX_CONTINUE;
1705
1706 /*
1707 * Don't do anything if the station isn't already asleep. In
1708 * the uAPSD case, the station will probably be marked asleep,
1709 * in the PS-Poll case the station must be confused ...
1710 */
c2c98fde 1711 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1712 return RX_CONTINUE;
1713
1714 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
46fa38e8 1715 ieee80211_sta_pspoll(&rx->sta->sta);
47086fc5
JB		 1716
1717 /* Free PS Poll skb here instead of returning RX_DROP that would
1718 * count as an dropped frame. */
1719 dev_kfree_skb(rx->skb);
1720
1721 return RX_QUEUED;
1722 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1723 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1724 ieee80211_has_pm(hdr->frame_control) &&
1725 (ieee80211_is_data_qos(hdr->frame_control) ||
1726 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
a1f2ba04 1727 u8 tid = ieee80211_get_tid(hdr);
47086fc5 1728
46fa38e8 1729 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
47086fc5
JB		 1730 }
1731
1732 return RX_CONTINUE;
1733}
1734
49461622 1735static ieee80211_rx_result debug_noinline
5cf121c3 1736ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1737{
1738 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1739 struct sk_buff *skb = rx->skb;
1740 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1741 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1742 int i;
571ecf67
JB		 1743
1744 if (!sta)
9ae54c84 1745 return RX_CONTINUE;
571ecf67 1746
b291ba11
JB		 1747 /*
1748 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1749 * BSSID and for station already AUTHORIZED to avoid keeping the
1750 * current IBSS network alive in cases where other STAs start
1751 * using different BSSID. This will also give the station another
1752 * chance to restart the authentication/authorization in case
1753 * something went wrong the first time.
b291ba11 1754 */
05c914fe 1755 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1756 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1757 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1758 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1759 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1760 sta->rx_stats.last_rx = jiffies;
f4ebddf9 1761 if (ieee80211_is_data(hdr->frame_control) &&
4f6b1b3d
JB		 1762 !is_multicast_ether_addr(hdr->addr1))
1763 sta->rx_stats.last_rate =
1764 sta_stats_encode_rate(status);
3af6334c 1765 }
239281f8 1766 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1767 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1768 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1769 /*
33b64eb2
LCC		 1770 * Mesh beacons will update last_rx when if they are found to
1771 * match the current local configuration when processed.
571ecf67 1772 */
e5a9f8d0 1773 sta->rx_stats.last_rx = jiffies;
4f6b1b3d
JB		 1774 if (ieee80211_is_data(hdr->frame_control))
1775 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
571ecf67
JB		 1776 }
1777
3cf335d5
KV		 1778 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1779 ieee80211_sta_rx_notify(rx->sdata, hdr);
1780
e5a9f8d0 1781 sta->rx_stats.fragments++;
0f9c5a61
JB		 1782
1783 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
e5a9f8d0 1784 sta->rx_stats.bytes += rx->skb->len;
0f9c5a61
JB		 1785 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1786
fe8431f8 1787 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0 1788 sta->rx_stats.last_signal = status->signal;
0be6ed13 1789 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
fe8431f8 1790 }
571ecf67 1791
ef0621e8 1792 if (status->chains) {
e5a9f8d0 1793 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1794 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1795 int signal = status->chain_signal[i];
1796
1797 if (!(status->chains & BIT(i)))
1798 continue;
1799
e5a9f8d0 1800 sta->rx_stats.chain_signal_last[i] = signal;
0be6ed13 1801 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
e5a9f8d0 1802 -signal);
ef0621e8
FF		 1803 }
1804 }
1805
72eaa43a
JB		 1806 /*
1807 * Change STA power saving mode only at the end of a frame
9fef6544
EG		 1808 * exchange sequence, and only for a data or management
1809 * frame as specified in IEEE 802.11-2016 11.2.3.2
72eaa43a 1810 */
30686bf7 1811 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1812 !ieee80211_has_morefrags(hdr->frame_control) &&
20932750 1813 !is_multicast_ether_addr(hdr->addr1) &&
9fef6544
EG		 1814 (ieee80211_is_mgmt(hdr->frame_control) ||
1815 ieee80211_is_data(hdr->frame_control)) &&
4cfda47b 1816 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1817 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
9fef6544 1818 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1819 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1820 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1821 sta_ps_end(sta);
72eaa43a
JB		 1822 } else {
1823 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1824 sta_ps_start(sta);
72eaa43a 1825 }
571ecf67
JB		 1826 }
1827
3f52b7e3
MP		 1828 /* mesh power save support */
1829 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1830 ieee80211_mps_rx_h_sta_process(sta, hdr);
1831
22403def
JB		 1832 /*
1833 * Drop (qos-)data::nullfunc frames silently, since they
1834 * are used only to control station power saving mode.
1835 */
1836 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1837 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1838 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1839
1840 /*
1841 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1842 * that was not moved to a 4-addr STA vlan yet send
1843 * the event to userspace and for older hostapd drop
1844 * the frame to the monitor interface.
d524215f
FF		 1845 */
1846 if (ieee80211_has_a4(hdr->frame_control) &&
1847 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1848 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1849 !rx->sdata->u.vlan.sta))) {
1850 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1851 cfg80211_rx_unexpected_4addr_frame(
1852 rx->sdata->dev, sta->sta.addr,
1853 GFP_ATOMIC);
d524215f 1854 return RX_DROP_MONITOR;
e7f4a940 1855 }
22403def
JB		 1856 /*
1857 * Update counter and free packet here to avoid
1858 * counting this as a dropped packed.
1859 */
e5a9f8d0 1860 sta->rx_stats.packets++;
571ecf67 1861 dev_kfree_skb(rx->skb);
9ae54c84 1862 return RX_QUEUED;
571ecf67
JB		 1863 }
1864
9ae54c84 1865 return RX_CONTINUE;
571ecf67
JB		 1866} /* ieee80211_rx_h_sta_process */
1867
86c228a7
JA		 1868static ieee80211_rx_result debug_noinline
1869ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1870{
1871 struct sk_buff *skb = rx->skb;
1872 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1873 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1874 int keyidx;
86c228a7
JA		 1875 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1876 struct ieee80211_key *sta_ptk = NULL;
96fc6efb 1877 struct ieee80211_key *ptk_idx = NULL;
86c228a7
JA		 1878 int mmie_keyidx = -1;
1879 __le16 fc;
2475b1cc 1880 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1881
1882 /*
1883 * Key selection 101
1884 *
1885 * There are four types of keys:
1886 * - GTK (group keys)
1887 * - IGTK (group keys for management frames)
1888 * - PTK (pairwise keys)
1889 * - STK (station-to-station pairwise keys)
1890 *
1891 * When selecting a key, we have to distinguish between multicast
1892 * (including broadcast) and unicast frames, the latter can only
1893 * use PTKs and STKs while the former always use GTKs and IGTKs.
1894 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1895 * unicast frames can also use key indices like GTKs. Hence, if we
1896 * don't have a PTK/STK we check the key index for a WEP key.
1897 *
1898 * Note that in a regular BSS, multicast frames are sent by the
1899 * AP only, associated stations unicast the frame to the AP first
1900 * which then multicasts it on their behalf.
1901 *
1902 * There is also a slight problem in IBSS mode: GTKs are negotiated
1903 * with each station, that is something we don't currently handle.
1904 * The spec seems to expect that one negotiates the same key with
1905 * every station but there's no such requirement; VLANs could be
1906 * possible.
1907 */
1908
86c228a7
JA		 1909 /* start without a key */
1910 rx->key = NULL;
2475b1cc 1911 fc = hdr->frame_control;
86c228a7 1912
2475b1cc
MS		 1913 if (rx->sta) {
1914 int keyid = rx->sta->ptk_idx;
96fc6efb 1915 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
86c228a7 1916
96fc6efb 1917 if (ieee80211_has_protected(fc)) {
2475b1cc 1918 cs = rx->sta->cipher_scheme;
96fc6efb
AW		 1919 keyid = ieee80211_get_keyid(rx->skb, cs);
1920
2475b1cc
MS		 1921 if (unlikely(keyid < 0))
1922 return RX_DROP_UNUSABLE;
96fc6efb
AW		 1923
1924 ptk_idx = rcu_dereference(rx->sta->ptk[keyid]);
2475b1cc 1925 }
2475b1cc 1926 }
86c228a7
JA		 1927
1928 if (!ieee80211_has_protected(fc))
1929 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1930
1931 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
96fc6efb 1932 rx->key = ptk_idx ? ptk_idx : sta_ptk;
86c228a7
JA		 1933 if ((status->flag & RX_FLAG_DECRYPTED) &&
1934 (status->flag & RX_FLAG_IV_STRIPPED))
1935 return RX_CONTINUE;
1936 /* Skip decryption if the frame is not protected. */
1937 if (!ieee80211_has_protected(fc))
1938 return RX_CONTINUE;
1939 } else if (mmie_keyidx >= 0) {
1940 /* Broadcast/multicast robust management frame / BIP */
1941 if ((status->flag & RX_FLAG_DECRYPTED) &&
1942 (status->flag & RX_FLAG_IV_STRIPPED))
1943 return RX_CONTINUE;
1944
1945 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1946 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1947 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
46f6b060
MH		 1948 if (rx->sta) {
1949 if (ieee80211_is_group_privacy_action(skb) &&
1950 test_sta_flag(rx->sta, WLAN_STA_MFP))
1951 return RX_DROP_MONITOR;
1952
86c228a7 1953 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
46f6b060 1954 }
86c228a7
JA		 1955 if (!rx->key)
1956 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1957 } else if (!ieee80211_has_protected(fc)) {
1958 /*
1959 * The frame was not protected, so skip decryption. However, we
1960 * need to set rx->key if there is a key that could have been
1961 * used so that the frame may be dropped if encryption would
1962 * have been expected.
1963 */
1964 struct ieee80211_key *key = NULL;
1965 struct ieee80211_sub_if_data *sdata = rx->sdata;
1966 int i;
1967
1968 if (ieee80211_is_mgmt(fc) &&
1969 is_multicast_ether_addr(hdr->addr1) &&
1970 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1971 rx->key = key;
1972 else {
1973 if (rx->sta) {
1974 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1975 key = rcu_dereference(rx->sta->gtk[i]);
1976 if (key)
1977 break;
1978 }
1979 }
1980 if (!key) {
1981 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1982 key = rcu_dereference(sdata->keys[i]);
1983 if (key)
1984 break;
1985 }
1986 }
1987 if (key)
1988 rx->key = key;
1989 }
1990 return RX_CONTINUE;
1991 } else {
86c228a7
JA		 1992 /*
1993 * The device doesn't give us the IV so we won't be
1994 * able to look up the key. That's ok though, we
1995 * don't need to decrypt the frame, we just won't
1996 * be able to keep statistics accurate.
1997 * Except for key threshold notifications, should
1998 * we somehow allow the driver to tell us which key
1999 * the hardware used if this flag is set?
2000 */
2001 if ((status->flag & RX_FLAG_DECRYPTED) &&
2002 (status->flag & RX_FLAG_IV_STRIPPED))
2003 return RX_CONTINUE;
2004
96fc6efb 2005 keyidx = ieee80211_get_keyid(rx->skb, cs);
86c228a7 2006
96fc6efb
AW		 2007 if (unlikely(keyidx < 0))
2008 return RX_DROP_UNUSABLE;
86c228a7
JA		 2009
2010 /* check per-station GTK first, if multicast packet */
2011 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
2012 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
2013
2014 /* if not found, try default key */
2015 if (!rx->key) {
2016 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
2017
2018 /*
2019 * RSNA-protected unicast frames should always be
2020 * sent with pairwise or station-to-station keys,
2021 * but for WEP we allow using a key index as well.
2022 */
2023 if (rx->key &&
2024 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
2025 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
2026 !is_multicast_ether_addr(hdr->addr1))
2027 rx->key = NULL;
2028 }
2029 }
2030
2031 if (rx->key) {
2032 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
2033 return RX_DROP_MONITOR;
2034
86c228a7
JA		 2035 /* TODO: add threshold stuff again */
2036 } else {
2037 return RX_DROP_MONITOR;
2038 }
2039
2040 switch (rx->key->conf.cipher) {
2041 case WLAN_CIPHER_SUITE_WEP40:
2042 case WLAN_CIPHER_SUITE_WEP104:
2043 result = ieee80211_crypto_wep_decrypt(rx);
2044 break;
2045 case WLAN_CIPHER_SUITE_TKIP:
2046 result = ieee80211_crypto_tkip_decrypt(rx);
2047 break;
2048 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 2049 result = ieee80211_crypto_ccmp_decrypt(
2050 rx, IEEE80211_CCMP_MIC_LEN);
2051 break;
2052 case WLAN_CIPHER_SUITE_CCMP_256:
2053 result = ieee80211_crypto_ccmp_decrypt(
2054 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 2055 break;
2056 case WLAN_CIPHER_SUITE_AES_CMAC:
2057 result = ieee80211_crypto_aes_cmac_decrypt(rx);
2058 break;
56c52da2
JM		 2059 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2060 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
2061 break;
8ade538b
JM		 2062 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2063 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2064 result = ieee80211_crypto_aes_gmac_decrypt(rx);
2065 break;
00b9cfa3
JM		 2066 case WLAN_CIPHER_SUITE_GCMP:
2067 case WLAN_CIPHER_SUITE_GCMP_256:
2068 result = ieee80211_crypto_gcmp_decrypt(rx);
2069 break;
86c228a7 2070 default:
2475b1cc 2071 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 2072 }
2073
2074 /* the hdr variable is invalid after the decrypt handlers */
2075
2076 /* either the frame has been decrypted or will be dropped */
2077 status->flag |= RX_FLAG_DECRYPTED;
2078
2079 return result;
2080}
2081
571ecf67
JB		 2082static inline struct ieee80211_fragment_entry *
2083ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
2084 unsigned int frag, unsigned int seq, int rx_queue,
2085 struct sk_buff **skb)
2086{
2087 struct ieee80211_fragment_entry *entry;
571ecf67 2088
571ecf67
JB		 2089 entry = &sdata->fragments[sdata->fragment_next++];
2090 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
2091 sdata->fragment_next = 0;
2092
bdcbd8e0 2093 if (!skb_queue_empty(&entry->skb_list))
571ecf67 2094 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 2095
2096 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
2097 *skb = NULL;
2098 entry->first_frag_time = jiffies;
2099 entry->seq = seq;
2100 entry->rx_queue = rx_queue;
2101 entry->last_frag = frag;
9acc54be 2102 entry->check_sequential_pn = false;
571ecf67
JB		 2103 entry->extra_len = 0;
2104
2105 return entry;
2106}
2107
2108static inline struct ieee80211_fragment_entry *
2109ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 2110 unsigned int frag, unsigned int seq,
571ecf67
JB		 2111 int rx_queue, struct ieee80211_hdr *hdr)
2112{
2113 struct ieee80211_fragment_entry *entry;
2114 int i, idx;
2115
2116 idx = sdata->fragment_next;
2117 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
2118 struct ieee80211_hdr *f_hdr;
7957a9de 2119 struct sk_buff *f_skb;
571ecf67
JB		 2120
2121 idx--;
2122 if (idx < 0)
2123 idx = IEEE80211_FRAGMENT_MAX - 1;
2124
2125 entry = &sdata->fragments[idx];
2126 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
2127 entry->rx_queue != rx_queue ||
2128 entry->last_frag + 1 != frag)
2129 continue;
2130
7957a9de
DM		 2131 f_skb = __skb_peek(&entry->skb_list);
2132 f_hdr = (struct ieee80211_hdr *) f_skb->data;
571ecf67 2133
b73d70ad
HH		 2134 /*
2135 * Check ftype and addresses are equal, else check next fragment
2136 */
2137 if (((hdr->frame_control ^ f_hdr->frame_control) &
2138 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 2139 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
2140 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 2141 continue;
2142
ab46623e 2143 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 2144 __skb_queue_purge(&entry->skb_list);
2145 continue;
2146 }
2147 return entry;
2148 }
2149
2150 return NULL;
2151}
2152
49461622 2153static ieee80211_rx_result debug_noinline
5cf121c3 2154ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 2155{
2156 struct ieee80211_hdr *hdr;
2157 u16 sc;
358c8d9d 2158 __le16 fc;
571ecf67
JB		 2159 unsigned int frag, seq;
2160 struct ieee80211_fragment_entry *entry;
2161 struct sk_buff *skb;
2162
b73d70ad 2163 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 2164 fc = hdr->frame_control;
f7fbf70e
JC		 2165
2166 if (ieee80211_is_ctl(fc))
2167 return RX_CONTINUE;
2168
571ecf67
JB		 2169 sc = le16_to_cpu(hdr->seq_ctrl);
2170 frag = sc & IEEE80211_SCTL_FRAG;
2171
b8fff407 2172 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 2173 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 2174 goto out_no_led;
571ecf67 2175 }
b8fff407 2176
d025933e
AM		 2177 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
2178 goto out;
2179
571ecf67
JB		 2180 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
2181
e3cf8b3f
ZY		 2182 if (skb_linearize(rx->skb))
2183 return RX_DROP_UNUSABLE;
2184
058897a4
AK		 2185 /*
2186 * skb_linearize() might change the skb->data and
2187 * previously cached variables (in this case, hdr) need to
2188 * be refreshed with the new data.
2189 */
2190 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 2191 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2192
2193 if (frag == 0) {
2194 /* This is the first fragment of a new frame. */
2195 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 2196 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 2197 if (rx->key &&
2198 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
9acc54be
JB		 2199 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2200 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2201 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
358c8d9d 2202 ieee80211_has_protected(fc)) {
9e26297a 2203 int queue = rx->security_idx;
9acc54be
JB		 2204
2205 /* Store CCMP/GCMP PN so that we can verify that the
2206 * next fragment has a sequential PN value.
2207 */
2208 entry->check_sequential_pn = true;
571ecf67 2209 memcpy(entry->last_pn,
9190252c 2210 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 2211 IEEE80211_CCMP_PN_LEN);
9acc54be
JB		 2212 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2213 u.ccmp.rx_pn) !=
2214 offsetof(struct ieee80211_key,
2215 u.gcmp.rx_pn));
2216 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2217 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2218 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2219 IEEE80211_GCMP_PN_LEN);
571ecf67 2220 }
9ae54c84 2221 return RX_QUEUED;
571ecf67
JB		 2222 }
2223
2224 /* This is a fragment for a frame that should already be pending in
2225 * fragment cache. Add this fragment to the end of the pending entry.
2226 */
9e26297a
JB		 2227 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2228 rx->seqno_idx, hdr);
571ecf67
JB		 2229 if (!entry) {
2230 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 2231 return RX_DROP_MONITOR;
571ecf67
JB		 2232 }
2233
9acc54be
JB		 2234 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2235 * MPDU PN values are not incrementing in steps of 1."
2236 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2237 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2238 */
2239 if (entry->check_sequential_pn) {
571ecf67 2240 int i;
4325f6ca 2241 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 2242 int queue;
9acc54be 2243
2b2ba0db
JM		 2244 if (!rx->key ||
2245 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
9acc54be
JB		 2246 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2247 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2248 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
e4c26add 2249 return RX_DROP_UNUSABLE;
4325f6ca
JB		 2250 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2251 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 2252 pn[i]++;
2253 if (pn[i])
2254 break;
2255 }
9e26297a 2256 queue = rx->security_idx;
9190252c 2257 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 2258 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 2259 return RX_DROP_UNUSABLE;
4325f6ca 2260 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 2261 }
2262
358c8d9d 2263 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 2264 __skb_queue_tail(&entry->skb_list, rx->skb);
2265 entry->last_frag = frag;
2266 entry->extra_len += rx->skb->len;
358c8d9d 2267 if (ieee80211_has_morefrags(fc)) {
571ecf67 2268 rx->skb = NULL;
9ae54c84 2269 return RX_QUEUED;
571ecf67
JB		 2270 }
2271
2272 rx->skb = __skb_dequeue(&entry->skb_list);
2273 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 2274 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 2275 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2276 GFP_ATOMIC))) {
2277 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2278 __skb_queue_purge(&entry->skb_list);
e4c26add 2279 return RX_DROP_UNUSABLE;
571ecf67
JB		 2280 }
2281 }
2282 while ((skb = __skb_dequeue(&entry->skb_list))) {
59ae1d12 2283 skb_put_data(rx->skb, skb->data, skb->len);
571ecf67
JB		 2284 dev_kfree_skb(skb);
2285 }
2286
571ecf67 2287 out:
d025933e
AM		 2288 ieee80211_led_rx(rx->local);
2289 out_no_led:
571ecf67 2290 if (rx->sta)
e5a9f8d0 2291 rx->sta->rx_stats.packets++;
9ae54c84 2292 return RX_CONTINUE;
571ecf67
JB		 2293}
2294
1df332e8 2295static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 2296{
1df332e8 2297 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 2298 return -EACCES;
571ecf67 2299
76ee65bf 2300 return 0;
571ecf67
JB		 2301}
2302
1df332e8 2303static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 2304{
eb9fb5b8
JB		 2305 struct sk_buff *skb = rx->skb;
2306 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2307
3017b80b 2308 /*
7848ba7d
JB		 2309 * Pass through unencrypted frames if the hardware has
2310 * decrypted them already.
3017b80b 2311 */
eb9fb5b8 2312 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 2313 return 0;
571ecf67
JB		 2314
2315 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 2316 if (unlikely(!ieee80211_has_protected(fc) &&
2317 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 2318 ieee80211_is_data(fc) && rx->key))
76ee65bf 2319 return -EACCES;
bef5d1c7
JB		 2320
2321 return 0;
2322}
2323
1df332e8 2324static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 2325{
2326 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 2327 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 2328 __le16 fc = hdr->frame_control;
bef5d1c7 2329
e3efca0a
JM		 2330 /*
2331 * Pass through unencrypted frames if the hardware has
2332 * decrypted them already.
2333 */
2334 if (status->flag & RX_FLAG_DECRYPTED)
2335 return 0;
bef5d1c7 2336
c2c98fde 2337 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 2338 if (unlikely(!ieee80211_has_protected(fc) &&
2339 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2340 rx->key)) {
6ff57cf8
JB		 2341 if (ieee80211_is_deauth(fc) ||
2342 ieee80211_is_disassoc(fc))
2343 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2344 rx->skb->data,
2345 rx->skb->len);
f2ca3ea4 2346 return -EACCES;
cf4e594e 2347 }
f2ca3ea4 2348 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2349 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2350 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2351 if (ieee80211_is_deauth(fc) ||
2352 ieee80211_is_disassoc(fc))
2353 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2354 rx->skb->data,
2355 rx->skb->len);
f2ca3ea4 2356 return -EACCES;
cf4e594e 2357 }
f2ca3ea4
JM		 2358 /*
2359 * When using MFP, Action frames are not allowed prior to
2360 * having configured keys.
2361 */
2362 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2363 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2364 return -EACCES;
2365 }
b3fc9c6c 2366
76ee65bf 2367 return 0;
571ecf67
JB		 2368}
2369
76ee65bf 2370static int
4114fa21 2371__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2372{
eb9fb5b8 2373 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2374 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2375 bool check_port_control = false;
2376 struct ethhdr *ehdr;
2377 int ret;
f14543ee 2378
4114fa21 2379 *port_control = false;
9bc383de
JB		 2380 if (ieee80211_has_a4(hdr->frame_control) &&
2381 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2382 return -1;
9bc383de 2383
fbb327c5
FF		 2384 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2385 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2386
2387 if (!sdata->u.mgd.use_4addr)
2388 return -1;
1ecef20c 2389 else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
fbb327c5
FF		 2390 check_port_control = true;
2391 }
2392
9bc383de 2393 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2394 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2395 return -1;
571ecf67 2396
fbb327c5 2397 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2398 if (ret < 0)
fbb327c5
FF		 2399 return ret;
2400
2401 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2402 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2403 *port_control = true;
2404 else if (check_port_control)
fbb327c5
FF		 2405 return -1;
2406
2407 return 0;
76ee65bf 2408}
571ecf67 2409
ce3edf6d
JB		 2410/*
2411 * requires that rx->skb is a frame with ethernet header
2412 */
358c8d9d 2413static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2414{
c97c23e3 2415 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2416 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2417 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2418
2419 /*
2420 * Allow EAPOL frames to us/the PAE group address regardless
2421 * of whether the frame was encrypted or not.
2422 */
a621fa4d 2423 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2424 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2425 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2426 return true;
2427
2428 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2429 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2430 return false;
2431
2432 return true;
2433}
2434
018f6fbf
DK		 2435static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
2436 struct ieee80211_rx_data *rx)
2437{
2438 struct ieee80211_sub_if_data *sdata = rx->sdata;
2439 struct net_device *dev = sdata->dev;
2440
2441 if (unlikely((skb->protocol == sdata->control_port_protocol ||
2442 skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
2443 sdata->control_port_over_nl80211)) {
2444 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2445 bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
018f6fbf 2446
a948f713 2447 cfg80211_rx_control_port(dev, skb, noencrypt);
018f6fbf
DK		 2448 dev_kfree_skb(skb);
2449 } else {
2450 /* deliver to local stack */
2451 if (rx->napi)
2452 napi_gro_receive(rx->napi, skb);
2453 else
2454 netif_receive_skb(skb);
2455 }
2456}
2457
ce3edf6d
JB		 2458/*
2459 * requires that rx->skb is a frame with ethernet header
2460 */
76ee65bf 2461static void
5cf121c3 2462ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2463{
eb9fb5b8
JB		 2464 struct ieee80211_sub_if_data *sdata = rx->sdata;
2465 struct net_device *dev = sdata->dev;
76ee65bf 2466 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2467 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2468 struct sta_info *dsta;
571ecf67 2469
76ee65bf
RR		 2470 skb = rx->skb;
2471 xmit_skb = NULL;
571ecf67 2472
5a490510
JB		 2473 ieee80211_rx_stats(dev, skb->len);
2474
de8f18d3
JB		 2475 if (rx->sta) {
2476 /* The seqno index has the same property as needed
2477 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2478 * for non-QoS-data frames. Here we know it's a data
2479 * frame, so count MSDUs.
2480 */
0f9c5a61 2481 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
de8f18d3 2482 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
0f9c5a61 2483 u64_stats_update_end(&rx->sta->rx_stats.syncp);
de8f18d3
JB		 2484 }
2485
05c914fe
JB		 2486 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2487 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2488 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2489 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
72f15d53
MB		 2490 if (is_multicast_ether_addr(ehdr->h_dest) &&
2491 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
ce3edf6d
JB		 2492 /*
2493 * send multicast frames both to higher layers in
2494 * local net stack and back to the wireless medium
2495 */
76ee65bf 2496 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2497 if (!xmit_skb)
bdcbd8e0 2498 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2499 dev->name);
42dca5ef
JB		 2500 } else if (!is_multicast_ether_addr(ehdr->h_dest) &&
2501 !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
2502 dsta = sta_info_get(sdata, ehdr->h_dest);
abe60632 2503 if (dsta) {
ce3edf6d
JB		 2504 /*
2505 * The destination station is associated to
2506 * this AP (in this VLAN), so send the frame
2507 * directly to it and do not pass it to local
2508 * net stack.
571ecf67 2509 */
76ee65bf 2510 xmit_skb = skb;
571ecf67
JB		 2511 skb = NULL;
2512 }
571ecf67
JB		 2513 }
2514 }
2515
59d9cb07 2516#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2517 if (skb) {
2518 /* 'align' will only take the values 0 or 2 here since all
2519 * frames are required to be aligned to 2-byte boundaries
2520 * when being passed to mac80211; the code here works just
2521 * as well if that isn't true, but mac80211 assumes it can
2522 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2523 */
9e890a1f
JB		 2524 int align;
2525
2526 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2527 if (align) {
2528 if (WARN_ON(skb_headroom(skb) < 3)) {
2529 dev_kfree_skb(skb);
2530 skb = NULL;
2531 } else {
2532 u8 *data = skb->data;
8ce0b589
ZY		 2533 size_t len = skb_headlen(skb);
2534 skb->data -= align;
2535 memmove(skb->data, data, len);
2536 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2537 }
2538 }
9e890a1f 2539 }
d1c3a37c
JB		 2540#endif
2541
9e890a1f 2542 if (skb) {
9e890a1f
JB		 2543 skb->protocol = eth_type_trans(skb, dev);
2544 memset(skb->cb, 0, sizeof(skb->cb));
018f6fbf
DK		 2545
2546 ieee80211_deliver_skb_to_local_stack(skb, rx);
571ecf67
JB		 2547 }
2548
76ee65bf 2549 if (xmit_skb) {
aef6c928
HS		 2550 /*
2551 * Send to wireless media and increase priority by 256 to
2552 * keep the received priority instead of reclassifying
2553 * the frame (see cfg80211_classify8021d).
2554 */
2555 xmit_skb->priority += 256;
f831e909 2556 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2557 skb_reset_network_header(xmit_skb);
2558 skb_reset_mac_header(xmit_skb);
76ee65bf 2559 dev_queue_xmit(xmit_skb);
571ecf67 2560 }
76ee65bf
RR		 2561}
2562
49461622 2563static ieee80211_rx_result debug_noinline
24bba078 2564__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset)
fd4c7f2f 2565{
eb9fb5b8 2566 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2567 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2568 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2569 __le16 fc = hdr->frame_control;
eaf85ca7 2570 struct sk_buff_head frame_list;
7f6990c8 2571 struct ethhdr ethhdr;
e2b5227f 2572 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
fd4c7f2f 2573
ea720935 2574 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
e2b5227f
JB		 2575 check_da = NULL;
2576 check_sa = NULL;
2577 } else switch (rx->sdata->vif.type) {
2578 case NL80211_IFTYPE_AP:
2579 case NL80211_IFTYPE_AP_VLAN:
2580 check_da = NULL;
2581 break;
2582 case NL80211_IFTYPE_STATION:
2583 if (!rx->sta ||
2584 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2585 check_sa = NULL;
2586 break;
2587 case NL80211_IFTYPE_MESH_POINT:
2588 check_sa = NULL;
2589 break;
2590 default:
2591 break;
ea720935 2592 }
fd4c7f2f 2593
eaf85ca7
ZY		 2594 skb->dev = dev;
2595 __skb_queue_head_init(&frame_list);
fd4c7f2f 2596
7f6990c8
JB		 2597 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2598 rx->sdata->vif.addr,
24bba078
FF		 2599 rx->sdata->vif.type,
2600 data_offset))
7f6990c8
JB		 2601 return RX_DROP_UNUSABLE;
2602
eaf85ca7
ZY		 2603 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2604 rx->sdata->vif.type,
8b935ee2 2605 rx->local->hw.extra_tx_headroom,
e2b5227f 2606 check_da, check_sa);
fd4c7f2f 2607
eaf85ca7
ZY		 2608 while (!skb_queue_empty(&frame_list)) {
2609 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2610
358c8d9d 2611 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2612 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2613 continue;
2614 }
fd4c7f2f
RR		 2615
2616 ieee80211_deliver_skb(rx);
2617 }
2618
9ae54c84 2619 return RX_QUEUED;
fd4c7f2f
RR		 2620}
2621
24bba078
FF		 2622static ieee80211_rx_result debug_noinline
2623ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
2624{
2625 struct sk_buff *skb = rx->skb;
2626 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2627 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2628 __le16 fc = hdr->frame_control;
2629
2630 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
2631 return RX_CONTINUE;
2632
2633 if (unlikely(!ieee80211_is_data(fc)))
2634 return RX_CONTINUE;
2635
2636 if (unlikely(!ieee80211_is_data_present(fc)))
2637 return RX_DROP_MONITOR;
2638
2639 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2640 switch (rx->sdata->vif.type) {
2641 case NL80211_IFTYPE_AP_VLAN:
2642 if (!rx->sdata->u.vlan.sta)
2643 return RX_DROP_UNUSABLE;
2644 break;
2645 case NL80211_IFTYPE_STATION:
2646 if (!rx->sdata->u.mgd.use_4addr)
2647 return RX_DROP_UNUSABLE;
2648 break;
2649 default:
2650 return RX_DROP_UNUSABLE;
2651 }
2652 }
2653
2654 if (is_multicast_ether_addr(hdr->addr1))
2655 return RX_DROP_UNUSABLE;
2656
2657 return __ieee80211_rx_h_amsdu(rx, 0);
2658}
2659
bf94e17b 2660#ifdef CONFIG_MAC80211_MESH
b0dee578 2661static ieee80211_rx_result
e32f85f7
LCC		 2662ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2663{
30789eb6
TP		 2664 struct ieee80211_hdr *fwd_hdr, *hdr;
2665 struct ieee80211_tx_info *info;
e32f85f7 2666 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2667 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2668 struct ieee80211_local *local = rx->local;
eb9fb5b8 2669 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2670 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
cf440128 2671 u16 ac, q, hdrlen;
51d0af22 2672 int tailroom = 0;
e32f85f7
LCC		 2673
2674 hdr = (struct ieee80211_hdr *) skb->data;
2675 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2676
2677 /* make sure fixed part of mesh header is there, also checks skb len */
2678 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2679 return RX_DROP_MONITOR;
2680
2681 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2682
2683 /* make sure full mesh header is there, also checks skb len */
2684 if (!pskb_may_pull(rx->skb,
2685 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2686 return RX_DROP_MONITOR;
2687
2688 /* reload pointers */
2689 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2690 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2691
d0c22119
BC		 2692 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2693 return RX_DROP_MONITOR;
2694
2157fdd6
TP		 2695 /* frame is in RMC, don't forward */
2696 if (ieee80211_is_data(hdr->frame_control) &&
2697 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2698 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2699 return RX_DROP_MONITOR;
2700
5c90067c 2701 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2702 return RX_CONTINUE;
2703
2704 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2705 return RX_DROP_MONITOR;
2706
43b7b314 2707 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2708 struct mesh_path *mppath;
43b7b314
JC		 2709 char *proxied_addr;
2710 char *mpp_addr;
2711
2712 if (is_multicast_ether_addr(hdr->addr1)) {
2713 mpp_addr = hdr->addr3;
2714 proxied_addr = mesh_hdr->eaddr1;
5667c86a
RM		 2715 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2716 MESH_FLAGS_AE_A5_A6) {
9b395bc3 2717 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2718 mpp_addr = hdr->addr4;
2719 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2720 } else {
2721 return RX_DROP_MONITOR;
43b7b314 2722 }
79617dee 2723
79617dee 2724 rcu_read_lock();
bf7cd94d 2725 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2726 if (!mppath) {
bf7cd94d 2727 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2728 } else {
2729 spin_lock_bh(&mppath->state_lock);
b203ca39 2730 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2731 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
ab1c7906 2732 mppath->exp_time = jiffies;
79617dee
Y		 2733 spin_unlock_bh(&mppath->state_lock);
2734 }
2735 rcu_read_unlock();
2736 }
2737
3c5772a5
JC		 2738 /* Frame has reached destination. Don't forward */
2739 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2740 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2741 return RX_CONTINUE;
2742
cf440128
MK		 2743 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2744 q = sdata->vif.hw_queue[ac];
d3c1597b 2745 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2746 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2747 return RX_DROP_MONITOR;
2748 }
2749 skb_set_queue_mapping(skb, q);
e32f85f7 2750
30789eb6 2751 if (!--mesh_hdr->ttl) {
a0dc0203
BC		 2752 if (!is_multicast_ether_addr(hdr->addr1))
2753 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh,
2754 dropped_frames_ttl);
2ac64cd1 2755 goto out;
30789eb6
TP		 2756 }
2757
d665508b
CYY		 2758 if (!ifmsh->mshcfg.dot11MeshForwarding)
2759 goto out;
2760
51d0af22
FF		 2761 if (sdata->crypto_tx_tailroom_needed_cnt)
2762 tailroom = IEEE80211_ENCRYPT_TAILROOM;
2763
c38c39bf 2764 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
51d0af22
FF		 2765 sdata->encrypt_headroom,
2766 tailroom, GFP_ATOMIC);
0c3d5a96 2767 if (!fwd_skb)
30789eb6 2768 goto out;
30789eb6
TP		 2769
2770 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2771 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2772 info = IEEE80211_SKB_CB(fwd_skb);
2773 memset(info, 0, sizeof(*info));
2774 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2775 info->control.vif = &rx->sdata->vif;
2776 info->control.jiffies = jiffies;
2777 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2778 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2779 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2780 /* update power mode indication when forwarding */
2781 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2782 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2783 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2784 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2785 } else {
2786 /* unable to resolve next hop */
bf7cd94d 2787 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2788 fwd_hdr->addr3, 0,
2789 WLAN_REASON_MESH_PATH_NOFORWARD,
2790 fwd_hdr->addr2);
30789eb6 2791 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2792 kfree_skb(fwd_skb);
30789eb6 2793 return RX_DROP_MONITOR;
e32f85f7
LCC		 2794 }
2795
30789eb6
TP		 2796 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2797 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2798 out:
df140465 2799 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2800 return RX_CONTINUE;
df140465 2801 return RX_DROP_MONITOR;
e32f85f7 2802}
bf94e17b 2803#endif
e32f85f7 2804
49461622 2805static ieee80211_rx_result debug_noinline
5cf121c3 2806ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2807{
eb9fb5b8 2808 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2809 struct ieee80211_local *local = rx->local;
eb9fb5b8 2810 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2811 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2812 __le16 fc = hdr->frame_control;
4114fa21 2813 bool port_control;
ce3edf6d 2814 int err;
76ee65bf 2815
358c8d9d 2816 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2817 return RX_CONTINUE;
76ee65bf 2818
358c8d9d 2819 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2820 return RX_DROP_MONITOR;
76ee65bf 2821
f14543ee 2822 /*
e7f4a940
JB		 2823 * Send unexpected-4addr-frame event to hostapd. For older versions,
2824 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2825 */
2826 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2827 sdata->vif.type == NL80211_IFTYPE_AP) {
2828 if (rx->sta &&
2829 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2830 cfg80211_rx_unexpected_4addr_frame(
2831 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2832 return RX_DROP_MONITOR;
e7f4a940 2833 }
f14543ee 2834
4114fa21 2835 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2836 if (unlikely(err))
e4c26add 2837 return RX_DROP_UNUSABLE;
76ee65bf 2838
358c8d9d 2839 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2840 return RX_DROP_MONITOR;
ce3edf6d 2841
8a4d32f3
AN		 2842 /* directly handle TDLS channel switch requests/responses */
2843 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2844 cpu_to_be16(ETH_P_TDLS))) {
2845 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2846
2847 if (pskb_may_pull(rx->skb,
2848 offsetof(struct ieee80211_tdls_data, u)) &&
2849 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2850 tf->category == WLAN_CATEGORY_TDLS &&
2851 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2852 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2853 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2854 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2855 if (rx->sta)
e5a9f8d0 2856 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2857
2858 return RX_QUEUED;
2859 }
2860 }
2861
4114fa21
FF		 2862 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2863 unlikely(port_control) && sdata->bss) {
2864 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2865 u.ap);
2866 dev = sdata->dev;
2867 rx->sdata = sdata;
2868 }
2869
76ee65bf
RR		 2870 rx->skb->dev = dev;
2871
602fae42
JB		 2872 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2873 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2874 !is_multicast_ether_addr(
2875 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2876 (!local->scanning &&
602fae42
JB		 2877 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2878 mod_timer(&local->dynamic_ps_timer, jiffies +
2879 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
e15276a4 2880
76ee65bf 2881 ieee80211_deliver_skb(rx);
571ecf67 2882
9ae54c84 2883 return RX_QUEUED;
571ecf67
JB		 2884}
2885
49461622 2886static ieee80211_rx_result debug_noinline
f9e124fb 2887ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2888{
71364716 2889 struct sk_buff *skb = rx->skb;
a7767f95 2890 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2891 struct tid_ampdu_rx *tid_agg_rx;
2892 u16 start_seq_num;
2893 u16 tid;
2894
a7767f95 2895 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2896 return RX_CONTINUE;
71364716 2897
a7767f95 2898 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2899 struct {
2900 __le16 control, start_seq_num;
2901 } __packed bar_data;
6382246e
EG		 2902 struct ieee80211_event event = {
2903 .type = BAR_RX_EVENT,
2904 };
8ae5977f 2905
71364716 2906 if (!rx->sta)
a02ae758 2907 return RX_DROP_MONITOR;
8ae5977f
JB		 2908
2909 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2910 &bar_data, sizeof(bar_data)))
2911 return RX_DROP_MONITOR;
2912
8ae5977f 2913 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d 2914
53f24974
JB		 2915 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2916 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2917 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2918 WLAN_BACK_RECIPIENT,
2919 WLAN_REASON_QSTA_REQUIRE_SETUP);
2920
a87f736d
JB		 2921 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2922 if (!tid_agg_rx)
a02ae758 2923 return RX_DROP_MONITOR;
71364716 2924
8ae5977f 2925 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2926 event.u.ba.tid = tid;
2927 event.u.ba.ssn = start_seq_num;
2928 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2929
2930 /* reset session timer */
20ad19d0
JB		 2931 if (tid_agg_rx->timeout)
2932 mod_timer(&tid_agg_rx->session_timer,
2933 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2934
dd318575 2935 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2936 /* release stored frames up to start of BAR */
d3b2fb53 2937 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2938 start_seq_num, frames);
dd318575
JB		 2939 spin_unlock(&tid_agg_rx->reorder_lock);
2940
6382246e
EG		 2941 drv_event_callback(rx->local, rx->sdata, &event);
2942
a02ae758
JB		 2943 kfree_skb(skb);
2944 return RX_QUEUED;
71364716
RR		 2945 }
2946
08daecae
JB		 2947 /*
2948 * After this point, we only want management frames,
2949 * so we can drop all remaining control frames to
2950 * cooked monitor interfaces.
2951 */
2952 return RX_DROP_MONITOR;
71364716
RR		 2953}
2954
f4f727a6
JM		 2955static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2956 struct ieee80211_mgmt *mgmt,
2957 size_t len)
fea14732
JM		 2958{
2959 struct ieee80211_local *local = sdata->local;
2960 struct sk_buff *skb;
2961 struct ieee80211_mgmt *resp;
2962
b203ca39 2963 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2964 /* Not to own unicast address */
2965 return;
2966 }
2967
b203ca39
JP		 2968 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2969 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2970 /* Not from the current AP or not associated yet. */
fea14732
JM		 2971 return;
2972 }
2973
2974 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2975 /* Too short SA Query request frame */
2976 return;
2977 }
2978
2979 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2980 if (skb == NULL)
2981 return;
2982
2983 skb_reserve(skb, local->hw.extra_tx_headroom);
b080db58 2984 resp = skb_put_zero(skb, 24);
fea14732 2985 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2986 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2987 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2988 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2989 IEEE80211_STYPE_ACTION);
2990 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2991 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2992 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2993 memcpy(resp->u.action.u.sa_query.trans_id,
2994 mgmt->u.action.u.sa_query.trans_id,
2995 WLAN_SA_QUERY_TR_ID_LEN);
2996
62ae67be 2997 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2998}
2999
2e161f78
JB		 3000static ieee80211_rx_result debug_noinline
3001ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
3002{
3003 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 3004 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 3005
3006 /*
3007 * From here on, look only at management frames.
3008 * Data and control frames are already handled,
3009 * and unknown (reserved) frames are useless.
3010 */
3011 if (rx->skb->len < 24)
3012 return RX_DROP_MONITOR;
3013
3014 if (!ieee80211_is_mgmt(mgmt->frame_control))
3015 return RX_DROP_MONITOR;
3016
ee971924
JB		 3017 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
3018 ieee80211_is_beacon(mgmt->frame_control) &&
3019 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 3020 int sig = 0;
3021
1ad22fb5
T		 3022 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3023 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
804483e9
JB		 3024 sig = status->signal;
3025
ee971924
JB		 3026 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
3027 rx->skb->data, rx->skb->len,
37c73b5f 3028 status->freq, sig);
ee971924
JB		 3029 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
3030 }
3031
2e161f78
JB		 3032 if (ieee80211_drop_unencrypted_mgmt(rx))
3033 return RX_DROP_UNUSABLE;
3034
3035 return RX_CONTINUE;
3036}
3037
de1ede7a
JB		 3038static ieee80211_rx_result debug_noinline
3039ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
3040{
3041 struct ieee80211_local *local = rx->local;
eb9fb5b8 3042 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 3043 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 3044 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 3045 int len = rx->skb->len;
3046
3047 if (!ieee80211_is_action(mgmt->frame_control))
3048 return RX_CONTINUE;
3049
026331c4
JM		 3050 /* drop too small frames */
3051 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 3052 return RX_DROP_UNUSABLE;
de1ede7a 3053
815b8092 3054 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 3055 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
3056 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 3057 return RX_DROP_UNUSABLE;
de1ede7a 3058
de1ede7a 3059 switch (mgmt->u.action.category) {
1d8d3dec
JB		 3060 case WLAN_CATEGORY_HT:
3061 /* reject HT action frames from stations not supporting HT */
3062 if (!rx->sta->sta.ht_cap.ht_supported)
3063 goto invalid;
3064
3065 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3066 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3067 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3068 sdata->vif.type != NL80211_IFTYPE_AP &&
3069 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3070 break;
3071
ec61cd63 3072 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 3073 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3074 goto invalid;
3075
3076 switch (mgmt->u.action.u.ht_smps.action) {
3077 case WLAN_HT_ACTION_SMPS: {
3078 struct ieee80211_supported_band *sband;
af0ed69b 3079 enum ieee80211_smps_mode smps_mode;
ff84e7bf 3080 struct sta_opmode_info sta_opmode = {};
1d8d3dec
JB		 3081
3082 /* convert to HT capability */
3083 switch (mgmt->u.action.u.ht_smps.smps_control) {
3084 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 3085 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 3086 break;
3087 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 3088 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 3089 break;
3090 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 3091 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 3092 break;
3093 default:
3094 goto invalid;
3095 }
1d8d3dec
JB		 3096
3097 /* if no change do nothing */
af0ed69b 3098 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 3099 goto handled;
af0ed69b 3100 rx->sta->sta.smps_mode = smps_mode;
57566b20 3101 sta_opmode.smps_mode =
3102 ieee80211_smps_mode_to_smps_mode(smps_mode);
ff84e7bf 3103 sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED;
1d8d3dec
JB		 3104
3105 sband = rx->local->hw.wiphy->bands[status->band];
3106
64f68e5d
JB		 3107 rate_control_rate_update(local, sband, rx->sta,
3108 IEEE80211_RC_SMPS_CHANGED);
ff84e7bf 3109 cfg80211_sta_opmode_change_notify(sdata->dev,
3110 rx->sta->addr,
3111 &sta_opmode,
c752cac9 3112 GFP_ATOMIC);
1d8d3dec
JB		 3113 goto handled;
3114 }
ec61cd63
JB		 3115 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
3116 struct ieee80211_supported_band *sband;
3117 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 3118 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ff84e7bf 3119 struct sta_opmode_info sta_opmode = {};
ec61cd63
JB		 3120
3121 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 3122 if (!(rx->sta->sta.ht_cap.cap &
3123 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 3124 goto handled;
3125
e1a0c6b3 3126 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 3127 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 3128 else
1c45c5ce
EP		 3129 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
3130
3131 /* set cur_max_bandwidth and recalc sta bw */
3132 rx->sta->cur_max_bandwidth = max_bw;
3133 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 3134
e1a0c6b3 3135 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 3136 goto handled;
3137
1c45c5ce 3138 rx->sta->sta.bandwidth = new_bw;
ec61cd63 3139 sband = rx->local->hw.wiphy->bands[status->band];
97f5f425 3140 sta_opmode.bw =
3141 ieee80211_sta_rx_bw_to_chan_width(rx->sta);
ff84e7bf 3142 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED;
ec61cd63
JB		 3143
3144 rate_control_rate_update(local, sband, rx->sta,
3145 IEEE80211_RC_BW_CHANGED);
ff84e7bf 3146 cfg80211_sta_opmode_change_notify(sdata->dev,
3147 rx->sta->addr,
3148 &sta_opmode,
c752cac9 3149 GFP_ATOMIC);
ec61cd63
JB		 3150 goto handled;
3151 }
1d8d3dec
JB		 3152 default:
3153 goto invalid;
3154 }
3155
0af83d3d 3156 break;
1b3a2e49
JB		 3157 case WLAN_CATEGORY_PUBLIC:
3158 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3159 goto invalid;
3160 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3161 break;
3162 if (!rx->sta)
3163 break;
3164 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
3165 break;
3166 if (mgmt->u.action.u.ext_chan_switch.action_code !=
3167 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
3168 break;
3169 if (len < offsetof(struct ieee80211_mgmt,
3170 u.action.u.ext_chan_switch.variable))
3171 goto invalid;
3172 goto queue;
0af83d3d
JB		 3173 case WLAN_CATEGORY_VHT:
3174 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
3175 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
3176 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
3177 sdata->vif.type != NL80211_IFTYPE_AP &&
3178 sdata->vif.type != NL80211_IFTYPE_ADHOC)
3179 break;
3180
3181 /* verify action code is present */
3182 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3183 goto invalid;
3184
3185 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
3186 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
0af83d3d
JB		 3187 /* verify opmode is present */
3188 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
3189 goto invalid;
d2941df8 3190 goto queue;
0af83d3d 3191 }
23a1f8d4
SS		 3192 case WLAN_VHT_ACTION_GROUPID_MGMT: {
3193 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
3194 goto invalid;
3195 goto queue;
3196 }
0af83d3d
JB		 3197 default:
3198 break;
3199 }
1d8d3dec 3200 break;
de1ede7a 3201 case WLAN_CATEGORY_BACK:
8abd3f9b 3202 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 3203 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 3204 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 3205 sdata->vif.type != NL80211_IFTYPE_AP &&
3206 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 3207 break;
8abd3f9b 3208
026331c4
JM		 3209 /* verify action_code is present */
3210 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3211 break;
3212
de1ede7a
JB		 3213 switch (mgmt->u.action.u.addba_req.action_code) {
3214 case WLAN_ACTION_ADDBA_REQ:
3215 if (len < (IEEE80211_MIN_ACTION_SIZE +
3216 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 3217 goto invalid;
3218 break;
de1ede7a
JB		 3219 case WLAN_ACTION_ADDBA_RESP:
3220 if (len < (IEEE80211_MIN_ACTION_SIZE +
3221 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 3222 goto invalid;
3223 break;
de1ede7a
JB		 3224 case WLAN_ACTION_DELBA:
3225 if (len < (IEEE80211_MIN_ACTION_SIZE +
3226 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 3227 goto invalid;
3228 break;
3229 default:
3230 goto invalid;
de1ede7a 3231 }
bed7ee6e 3232
8b58ff83 3233 goto queue;
39192c0b 3234 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 3235 /* verify action_code is present */
3236 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
3237 break;
3238
39192c0b
JB		 3239 switch (mgmt->u.action.u.measurement.action_code) {
3240 case WLAN_ACTION_SPCT_MSR_REQ:
57fbcce3 3241 if (status->band != NL80211_BAND_5GHZ)
cd7760e6
SW		 3242 break;
3243
39192c0b
JB		 3244 if (len < (IEEE80211_MIN_ACTION_SIZE +
3245 sizeof(mgmt->u.action.u.measurement)))
84040805 3246 break;
cd7760e6
SW		 3247
3248 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3249 break;
3250
39192c0b 3251 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 3252 goto handled;
cd7760e6
SW		 3253 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3254 u8 *bssid;
3255 if (len < (IEEE80211_MIN_ACTION_SIZE +
3256 sizeof(mgmt->u.action.u.chan_switch)))
84040805 3257 break;
cc32abd4 3258
cd7760e6 3259 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 3260 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3261 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 3262 break;
3263
3264 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3265 bssid = sdata->u.mgd.bssid;
3266 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3267 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 3268 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3269 bssid = mgmt->sa;
cd7760e6
SW		 3270 else
3271 break;
3272
3273 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 3274 break;
c481ec97 3275
8b58ff83 3276 goto queue;
cd7760e6 3277 }
39192c0b
JB		 3278 }
3279 break;
fea14732
JM		 3280 case WLAN_CATEGORY_SA_QUERY:
3281 if (len < (IEEE80211_MIN_ACTION_SIZE +
3282 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 3283 break;
3284
fea14732
JM		 3285 switch (mgmt->u.action.u.sa_query.action) {
3286 case WLAN_ACTION_SA_QUERY_REQUEST:
3287 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 3288 break;
fea14732 3289 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 3290 goto handled;
fea14732
JM		 3291 }
3292 break;
8db09850 3293 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 3294 if (len < (IEEE80211_MIN_ACTION_SIZE +
3295 sizeof(mgmt->u.action.u.self_prot.action_code)))
3296 break;
3297
8db09850
TP		 3298 switch (mgmt->u.action.u.self_prot.action_code) {
3299 case WLAN_SP_MESH_PEERING_OPEN:
3300 case WLAN_SP_MESH_PEERING_CLOSE:
3301 case WLAN_SP_MESH_PEERING_CONFIRM:
3302 if (!ieee80211_vif_is_mesh(&sdata->vif))
3303 goto invalid;
a6dad6a2 3304 if (sdata->u.mesh.user_mpm)
8db09850
TP		 3305 /* userspace handles this frame */
3306 break;
3307 goto queue;
3308 case WLAN_SP_MGK_INFORM:
3309 case WLAN_SP_MGK_ACK:
3310 if (!ieee80211_vif_is_mesh(&sdata->vif))
3311 goto invalid;
3312 break;
3313 }
3314 break;
d3aaec8a 3315 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 3316 if (len < (IEEE80211_MIN_ACTION_SIZE +
3317 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3318 break;
3319
77a121c3
JB		 3320 if (!ieee80211_vif_is_mesh(&sdata->vif))
3321 break;
25d49e4d 3322 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 3323 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 3324 break;
3325 goto queue;
84040805 3326 }
026331c4 3327
2e161f78
JB		 3328 return RX_CONTINUE;
3329
bed7ee6e 3330 invalid:
554891e6 3331 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 3332 /* will return in the next handlers */
3333 return RX_CONTINUE;
3334
3335 handled:
3336 if (rx->sta)
e5a9f8d0 3337 rx->sta->rx_stats.packets++;
2e161f78
JB		 3338 dev_kfree_skb(rx->skb);
3339 return RX_QUEUED;
3340
3341 queue:
2e161f78
JB		 3342 skb_queue_tail(&sdata->skb_queue, rx->skb);
3343 ieee80211_queue_work(&local->hw, &sdata->work);
3344 if (rx->sta)
e5a9f8d0 3345 rx->sta->rx_stats.packets++;
2e161f78
JB		 3346 return RX_QUEUED;
3347}
3348
3349static ieee80211_rx_result debug_noinline
3350ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3351{
554891e6 3352 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 3353 int sig = 0;
2e161f78
JB		 3354
3355 /* skip known-bad action frames and return them in the next handler */
554891e6 3356 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 3357 return RX_CONTINUE;
d7907448 3358
026331c4
JM		 3359 /*
3360 * Getting here means the kernel doesn't know how to handle
3361 * it, but maybe userspace does ... include returned frames
3362 * so userspace can register for those to know whether ones
3363 * it transmitted were processed or returned.
3364 */
026331c4 3365
1ad22fb5
T		 3366 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) &&
3367 !(status->flag & RX_FLAG_NO_SIGNAL_VAL))
804483e9
JB		 3368 sig = status->signal;
3369
71bbc994 3370 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 3371 rx->skb->data, rx->skb->len, 0)) {
2e161f78 3372 if (rx->sta)
e5a9f8d0 3373 rx->sta->rx_stats.packets++;
2e161f78
JB		 3374 dev_kfree_skb(rx->skb);
3375 return RX_QUEUED;
3376 }
3377
2e161f78
JB		 3378 return RX_CONTINUE;
3379}
3380
3381static ieee80211_rx_result debug_noinline
3382ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3383{
3384 struct ieee80211_local *local = rx->local;
3385 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3386 struct sk_buff *nskb;
3387 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 3388 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 3389
3390 if (!ieee80211_is_action(mgmt->frame_control))
3391 return RX_CONTINUE;
3392
3393 /*
3394 * For AP mode, hostapd is responsible for handling any action
3395 * frames that we didn't handle, including returning unknown
3396 * ones. For all other modes we will return them to the sender,
3397 * setting the 0x80 bit in the action category, as required by
4b5ebccc 3398 * 802.11-2012 9.24.4.
2e161f78
JB		 3399 * Newer versions of hostapd shall also use the management frame
3400 * registration mechanisms, but older ones still use cooked
3401 * monitor interfaces so push all frames there.
3402 */
554891e6 3403 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 3404 (sdata->vif.type == NL80211_IFTYPE_AP ||
3405 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3406 return RX_DROP_MONITOR;
026331c4 3407
4b5ebccc
JB		 3408 if (is_multicast_ether_addr(mgmt->da))
3409 return RX_DROP_MONITOR;
3410
84040805
JB		 3411 /* do not return rejected action frames */
3412 if (mgmt->u.action.category & 0x80)
3413 return RX_DROP_UNUSABLE;
3414
3415 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3416 GFP_ATOMIC);
3417 if (nskb) {
292b4df6 3418 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 3419
292b4df6
JL		 3420 nmgmt->u.action.category |= 0x80;
3421 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3422 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 3423
3424 memset(nskb->cb, 0, sizeof(nskb->cb));
3425
07e5a5f5
JB		 3426 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3427 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3428
3429 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3430 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3431 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 3432 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 3433 info->hw_queue =
3434 local->hw.offchannel_tx_hw_queue;
3435 }
3436
3437 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
b9771d41 3438 status->band, 0);
de1ede7a 3439 }
39192c0b
JB		 3440 dev_kfree_skb(rx->skb);
3441 return RX_QUEUED;
de1ede7a
JB		 3442}
3443
49461622 3444static ieee80211_rx_result debug_noinline
5cf121c3 3445ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3446{
eb9fb5b8 3447 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3448 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3449 __le16 stype;
571ecf67 3450
77a121c3 3451 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3452
77a121c3
JB		 3453 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3454 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3455 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3456 sdata->vif.type != NL80211_IFTYPE_STATION)
3457 return RX_DROP_MONITOR;
472dbc45 3458
77a121c3 3459 switch (stype) {
66e67e41 3460 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3461 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3462 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3463 /* process for all: mesh, mlme, ibss */
3464 break;
66e67e41
JB		 3465 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3466 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3467 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3468 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3469 if (is_multicast_ether_addr(mgmt->da) &&
3470 !is_broadcast_ether_addr(mgmt->da))
3471 return RX_DROP_MONITOR;
3472
77a121c3
JB		 3473 /* process only for station */
3474 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3475 return RX_DROP_MONITOR;
3476 break;
3477 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3478 /* process only for ibss and mesh */
3479 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3480 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3481 return RX_DROP_MONITOR;
3482 break;
3483 default:
3484 return RX_DROP_MONITOR;
3485 }
f9d540ee 3486
77a121c3
JB		 3487 /* queue up frame and kick off work to process it */
3488 skb_queue_tail(&sdata->skb_queue, rx->skb);
3489 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3490 if (rx->sta)
e5a9f8d0 3491 rx->sta->rx_stats.packets++;
46900298 3492
77a121c3 3493 return RX_QUEUED;
571ecf67
JB		 3494}
3495
5f0b7de5
JB		 3496static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3497 struct ieee80211_rate *rate)
3d30d949
MW		 3498{
3499 struct ieee80211_sub_if_data *sdata;
3500 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3501 struct sk_buff *skb = rx->skb, *skb2;
3502 struct net_device *prev_dev = NULL;
eb9fb5b8 3503 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3504 int needed_headroom;
3d30d949 3505
554891e6
JB		 3506 /*
3507 * If cooked monitor has been processed already, then
3508 * don't do it again. If not, set the flag.
3509 */
3510 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3511 goto out_free_skb;
554891e6 3512 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3513
152c477a
JB		 3514 /* If there are no cooked monitor interfaces, just free the SKB */
3515 if (!local->cooked_mntrs)
3516 goto out_free_skb;
3517
1f7bba79
JB		 3518 /* vendor data is long removed here */
3519 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3520 /* room for the radiotap header based on driver features */
1f7bba79 3521 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3522
293702a3
JB		 3523 if (skb_headroom(skb) < needed_headroom &&
3524 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3525 goto out_free_skb;
3d30d949 3526
293702a3 3527 /* prepend radiotap information */
973ef21a
FF		 3528 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3529 false);
3d30d949 3530
d57a544d 3531 skb_reset_mac_header(skb);
3d30d949
MW		 3532 skb->ip_summed = CHECKSUM_UNNECESSARY;
3533 skb->pkt_type = PACKET_OTHERHOST;
3534 skb->protocol = htons(ETH_P_802_2);
3535
3536 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3537 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3538 continue;
3539
05c914fe 3540 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
d8212184 3541 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3d30d949
MW		 3542 continue;
3543
3544 if (prev_dev) {
3545 skb2 = skb_clone(skb, GFP_ATOMIC);
3546 if (skb2) {
3547 skb2->dev = prev_dev;
5548a8a1 3548 netif_receive_skb(skb2);
3d30d949
MW		 3549 }
3550 }
3551
3552 prev_dev = sdata->dev;
5a490510 3553 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3554 }
3555
3556 if (prev_dev) {
3557 skb->dev = prev_dev;
5548a8a1 3558 netif_receive_skb(skb);
554891e6
JB		 3559 return;
3560 }
3d30d949
MW		 3561
3562 out_free_skb:
3563 dev_kfree_skb(skb);
3564}
3565
aa0c8636
CL		 3566static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3567 ieee80211_rx_result res)
3568{
3569 switch (res) {
3570 case RX_DROP_MONITOR:
3571 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3572 if (rx->sta)
e5a9f8d0 3573 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3574 /* fall through */
3575 case RX_CONTINUE: {
3576 struct ieee80211_rate *rate = NULL;
3577 struct ieee80211_supported_band *sband;
3578 struct ieee80211_rx_status *status;
3579
3580 status = IEEE80211_SKB_RXCB((rx->skb));
3581
3582 sband = rx->local->hw.wiphy->bands[status->band];
41cbb0f5 3583 if (status->encoding == RX_ENC_LEGACY)
aa0c8636
CL		 3584 rate = &sband->bitrates[status->rate_idx];
3585
3586 ieee80211_rx_cooked_monitor(rx, rate);
3587 break;
3588 }
3589 case RX_DROP_UNUSABLE:
3590 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3591 if (rx->sta)
e5a9f8d0 3592 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3593 dev_kfree_skb(rx->skb);
3594 break;
3595 case RX_QUEUED:
3596 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3597 break;
3598 }
3599}
571ecf67 3600
f9e124fb
CL		 3601static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3602 struct sk_buff_head *frames)
58905290 3603{
58905290 3604 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3605 struct sk_buff *skb;
8944b79f 3606
e32f85f7
LCC		 3607#define CALL_RXH(rxh) \
3608 do { \
3609 res = rxh(rx); \
3610 if (res != RX_CONTINUE) \
2569a826 3611 goto rxh_next; \
8ebaa5b0 3612 } while (0)
49461622 3613
45ceeee8
JB		 3614 /* Lock here to avoid hitting all of the data used in the RX
3615 * path (e.g. key data, station data, ...) concurrently when
3616 * a frame is released from the reorder buffer due to timeout
3617 * from the timer, potentially concurrently with RX from the
3618 * driver.
3619 */
f9e124fb 3620 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3621
f9e124fb 3622 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3623 /*
3624 * all the other fields are valid across frames
3625 * that belong to an aMPDU since they are on the
3626 * same TID from the same station
3627 */
3628 rx->skb = skb;
3629
8ebaa5b0
JB		 3630 CALL_RXH(ieee80211_rx_h_check_more_data);
3631 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3632 CALL_RXH(ieee80211_rx_h_sta_process);
3633 CALL_RXH(ieee80211_rx_h_decrypt);
3634 CALL_RXH(ieee80211_rx_h_defragment);
3635 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
2569a826 3636 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3637#ifdef CONFIG_MAC80211_MESH
aa0c8636 3638 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3639 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3640#endif
8ebaa5b0
JB		 3641 CALL_RXH(ieee80211_rx_h_amsdu);
3642 CALL_RXH(ieee80211_rx_h_data);
f9e124fb
CL		 3643
3644 /* special treatment -- needs the queue */
3645 res = ieee80211_rx_h_ctrl(rx, frames);
3646 if (res != RX_CONTINUE)
3647 goto rxh_next;
3648
8ebaa5b0
JB		 3649 CALL_RXH(ieee80211_rx_h_mgmt_check);
3650 CALL_RXH(ieee80211_rx_h_action);
3651 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3652 CALL_RXH(ieee80211_rx_h_action_return);
3653 CALL_RXH(ieee80211_rx_h_mgmt);
49461622 3654
aa0c8636
CL		 3655 rxh_next:
3656 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3657
49461622 3658#undef CALL_RXH
aa0c8636 3659 }
24a8fdad 3660
f9e124fb 3661 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3662}
3663
4406c376 3664static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3665{
f9e124fb 3666 struct sk_buff_head reorder_release;
aa0c8636
CL		 3667 ieee80211_rx_result res = RX_DROP_MONITOR;
3668
f9e124fb
CL		 3669 __skb_queue_head_init(&reorder_release);
3670
aa0c8636
CL		 3671#define CALL_RXH(rxh) \
3672 do { \
3673 res = rxh(rx); \
3674 if (res != RX_CONTINUE) \
3675 goto rxh_next; \
8ebaa5b0 3676 } while (0)
aa0c8636 3677
8ebaa5b0
JB		 3678 CALL_RXH(ieee80211_rx_h_check_dup);
3679 CALL_RXH(ieee80211_rx_h_check);
aa0c8636 3680
f9e124fb 3681 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3682
f9e124fb 3683 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3684 return;
49461622 3685
2569a826 3686 rxh_next:
aa0c8636
CL		 3687 ieee80211_rx_handlers_result(rx, res);
3688
3689#undef CALL_RXH
58905290
JB		 3690}
3691
2bff8ebf 3692/*
dd318575
JB		 3693 * This function makes calls into the RX path, therefore
3694 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3695 */
3696void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3697{
f9e124fb 3698 struct sk_buff_head frames;
554891e6
JB		 3699 struct ieee80211_rx_data rx = {
3700 .sta = sta,
3701 .sdata = sta->sdata,
3702 .local = sta->local,
9e26297a
JB		 3703 /* This is OK -- must be QoS data frame */
3704 .security_idx = tid,
3705 .seqno_idx = tid,
af9f9b22 3706 .napi = NULL, /* must be NULL to not have races */
554891e6 3707 };
2c15a0cf
CL		 3708 struct tid_ampdu_rx *tid_agg_rx;
3709
3710 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3711 if (!tid_agg_rx)
3712 return;
2bff8ebf 3713
f9e124fb
CL		 3714 __skb_queue_head_init(&frames);
3715
2c15a0cf 3716 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3717 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3718 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3719
b497de63
EG		 3720 if (!skb_queue_empty(&frames)) {
3721 struct ieee80211_event event = {
3722 .type = BA_FRAME_TIMEOUT,
3723 .u.ba.tid = tid,
3724 .u.ba.sta = &sta->sta,
3725 };
3726 drv_event_callback(rx.local, rx.sdata, &event);
3727 }
3728
f9e124fb 3729 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3730}
3731
06470f74
SS		 3732void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3733 u16 ssn, u64 filtered,
3734 u16 received_mpdus)
3735{
3736 struct sta_info *sta;
3737 struct tid_ampdu_rx *tid_agg_rx;
3738 struct sk_buff_head frames;
3739 struct ieee80211_rx_data rx = {
3740 /* This is OK -- must be QoS data frame */
3741 .security_idx = tid,
3742 .seqno_idx = tid,
3743 };
3744 int i, diff;
3745
3746 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3747 return;
3748
3749 __skb_queue_head_init(&frames);
3750
3751 sta = container_of(pubsta, struct sta_info, sta);
3752
3753 rx.sta = sta;
3754 rx.sdata = sta->sdata;
3755 rx.local = sta->local;
3756
3757 rcu_read_lock();
3758 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3759 if (!tid_agg_rx)
3760 goto out;
3761
3762 spin_lock_bh(&tid_agg_rx->reorder_lock);
3763
3764 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3765 int release;
3766
3767 /* release all frames in the reorder buffer */
3768 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3769 IEEE80211_SN_MODULO;
3770 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3771 release, &frames);
3772 /* update ssn to match received ssn */
3773 tid_agg_rx->head_seq_num = ssn;
3774 } else {
3775 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3776 &frames);
3777 }
3778
3779 /* handle the case that received ssn is behind the mac ssn.
3780 * it can be tid_agg_rx->buf_size behind and still be valid */
3781 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3782 if (diff >= tid_agg_rx->buf_size) {
3783 tid_agg_rx->reorder_buf_filtered = 0;
3784 goto release;
3785 }
3786 filtered = filtered >> diff;
3787 ssn += diff;
3788
3789 /* update bitmap */
3790 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3791 int index = (ssn + i) % tid_agg_rx->buf_size;
3792
3793 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3794 if (filtered & BIT_ULL(i))
3795 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3796 }
3797
3798 /* now process also frames that the filter marking released */
3799 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3800
3801release:
3802 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3803
3804 ieee80211_rx_handlers(&rx, &frames);
3805
3806 out:
3807 rcu_read_unlock();
3808}
3809EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3810
571ecf67
JB		 3811/* main receive path */
3812
a58fbe1a 3813static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3814{
20b01f80 3815 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3816 struct sk_buff *skb = rx->skb;
a58fbe1a 3817 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3818 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3819 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
e5f2e067 3820 bool multicast = is_multicast_ether_addr(hdr->addr1);
23a24def 3821
51fb61e7 3822 switch (sdata->vif.type) {
05c914fe 3823 case NL80211_IFTYPE_STATION:
9bc383de 3824 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3825 return false;
a58fbe1a
JB		 3826 if (multicast)
3827 return true;
3828 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3829 case NL80211_IFTYPE_ADHOC:
23a24def 3830 if (!bssid)
3c2723f5 3831 return false;
6329b8d9
FF		 3832 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3833 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3834 return false;
a58fbe1a 3835 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3836 return true;
a58fbe1a 3837 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3838 return false;
a58fbe1a
JB		 3839 if (!multicast &&
3840 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3841 return false;
a58fbe1a 3842 if (!rx->sta) {
0fb8ca45 3843 int rate_idx;
da6a4352 3844 if (status->encoding != RX_ENC_LEGACY)
5614618e 3845 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3846 else
eb9fb5b8 3847 rate_idx = status->rate_idx;
8bf11d8d
JB		 3848 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3849 BIT(rate_idx));
0fb8ca45 3850 }
a58fbe1a 3851 return true;
239281f8
RL		 3852 case NL80211_IFTYPE_OCB:
3853 if (!bssid)
3854 return false;
cc117298 3855 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3856 return false;
a58fbe1a 3857 if (!is_broadcast_ether_addr(bssid))
239281f8 3858 return false;
a58fbe1a
JB		 3859 if (!multicast &&
3860 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3861 return false;
a58fbe1a 3862 if (!rx->sta) {
239281f8 3863 int rate_idx;
da6a4352 3864 if (status->encoding != RX_ENC_LEGACY)
239281f8
RL		 3865 rate_idx = 0; /* TODO: HT rates */
3866 else
3867 rate_idx = status->rate_idx;
3868 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3869 BIT(rate_idx));
3870 }
a58fbe1a 3871 return true;
05c914fe 3872 case NL80211_IFTYPE_MESH_POINT:
736a80bb
JB		 3873 if (ether_addr_equal(sdata->vif.addr, hdr->addr2))
3874 return false;
a58fbe1a
JB		 3875 if (multicast)
3876 return true;
3877 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3878 case NL80211_IFTYPE_AP_VLAN:
3879 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3880 if (!bssid)
3881 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3882
3883 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3884 /*
3885 * Accept public action frames even when the
3886 * BSSID doesn't match, this is used for P2P
3887 * and location updates. Note that mac80211
3888 * itself never looks at these frames.
3889 */
2b9ccd4e
JB		 3890 if (!multicast &&
3891 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3892 return false;
d48b2968 3893 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3894 return true;
5c90067c 3895 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3896 }
3897
3898 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3899 /* ignore data frames to TDLS-peers */
3900 if (ieee80211_is_data(hdr->frame_control))
3901 return false;
3902 /* ignore action frames to TDLS-peers */
3903 if (ieee80211_is_action(hdr->frame_control) &&
1ec7bae8 3904 !is_broadcast_ether_addr(bssid) &&
db8e1732
AN		 3905 !ether_addr_equal(bssid, hdr->addr1))
3906 return false;
23a24def 3907 }
3018e947
JB		 3908
3909 /*
3910 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3911 * the BSSID - we've checked that already but may have accepted
3912 * the wildcard (ff:ff:ff:ff:ff:ff).
3913 *
3914 * It also says:
3915 * The BSSID of the Data frame is determined as follows:
3916 * a) If the STA is contained within an AP or is associated
3917 * with an AP, the BSSID is the address currently in use
3918 * by the STA contained in the AP.
3919 *
3920 * So we should not accept data frames with an address that's
3921 * multicast.
3922 *
3923 * Accepting it also opens a security problem because stations
3924 * could encrypt it with the GTK and inject traffic that way.
3925 */
3926 if (ieee80211_is_data(hdr->frame_control) && multicast)
3927 return false;
3928
a58fbe1a 3929 return true;
05c914fe 3930 case NL80211_IFTYPE_WDS:
a7767f95 3931 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3932 return false;
a58fbe1a 3933 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3934 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3935 return ieee80211_is_public_action(hdr, skb->len) ||
3936 ieee80211_is_probe_req(hdr->frame_control) ||
3937 ieee80211_is_probe_resp(hdr->frame_control) ||
3938 ieee80211_is_beacon(hdr->frame_control);
cb3b7d87
AB		 3939 case NL80211_IFTYPE_NAN:
3940 /* Currently no frames on NAN interface are allowed */
3941 return false;
2ca27bcf 3942 default:
fb1c1cd6 3943 break;
23a24def
JB		 3944 }
3945
a58fbe1a
JB		 3946 WARN_ON_ONCE(1);
3947 return false;
23a24def
JB		 3948}
3949
49ddf8e6
JB		 3950void ieee80211_check_fast_rx(struct sta_info *sta)
3951{
3952 struct ieee80211_sub_if_data *sdata = sta->sdata;
3953 struct ieee80211_local *local = sdata->local;
3954 struct ieee80211_key *key;
3955 struct ieee80211_fast_rx fastrx = {
3956 .dev = sdata->dev,
3957 .vif_type = sdata->vif.type,
3958 .control_port_protocol = sdata->control_port_protocol,
3959 }, *old, *new = NULL;
3960 bool assign = false;
3961
3962 /* use sparse to check that we don't return without updating */
3963 __acquire(check_fast_rx);
3964
3965 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3966 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3967 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3968 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3969
c9c5962b
JB		 3970 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3971
49ddf8e6
JB		 3972 /* fast-rx doesn't do reordering */
3973 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3974 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3975 goto clear;
3976
3977 switch (sdata->vif.type) {
3978 case NL80211_IFTYPE_STATION:
49ddf8e6
JB		 3979 if (sta->sta.tdls) {
3980 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3981 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3982 fastrx.expected_ds_bits = 0;
3983 } else {
3984 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3985 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3986 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3987 fastrx.expected_ds_bits =
3988 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3989 }
1d870162 3990
9251a473
FF		 3991 if (sdata->u.mgd.use_4addr && !sta->sta.tdls) {
3992 fastrx.expected_ds_bits |=
3993 cpu_to_le16(IEEE80211_FCTL_TODS);
3994 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3995 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3996 }
3997
1d870162
FF		 3998 if (!sdata->u.mgd.powersave)
3999 break;
4000
4001 /* software powersave is a huge mess, avoid all of it */
4002 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
4003 goto clear;
4004 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
4005 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
4006 goto clear;
49ddf8e6
JB		 4007 break;
4008 case NL80211_IFTYPE_AP_VLAN:
4009 case NL80211_IFTYPE_AP:
4010 /* parallel-rx requires this, at least with calls to
4011 * ieee80211_sta_ps_transition()
4012 */
4013 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
4014 goto clear;
4015 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
4016 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
4017 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
4018
4019 fastrx.internal_forward =
4020 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
4021 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
4022 !sdata->u.vlan.sta);
59cae5b9
FF		 4023
4024 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4025 sdata->u.vlan.sta) {
4026 fastrx.expected_ds_bits |=
4027 cpu_to_le16(IEEE80211_FCTL_FROMDS);
4028 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
4029 fastrx.internal_forward = 0;
4030 }
4031
49ddf8e6
JB		 4032 break;
4033 default:
4034 goto clear;
4035 }
4036
4037 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
4038 goto clear;
4039
4040 rcu_read_lock();
4041 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4042 if (key) {
4043 switch (key->conf.cipher) {
4044 case WLAN_CIPHER_SUITE_TKIP:
4045 /* we don't want to deal with MMIC in fast-rx */
4046 goto clear_rcu;
4047 case WLAN_CIPHER_SUITE_CCMP:
4048 case WLAN_CIPHER_SUITE_CCMP_256:
4049 case WLAN_CIPHER_SUITE_GCMP:
4050 case WLAN_CIPHER_SUITE_GCMP_256:
4051 break;
4052 default:
96fc6efb
AW		 4053 /* We also don't want to deal with
4054 * WEP or cipher scheme.
49ddf8e6
JB		 4055 */
4056 goto clear_rcu;
4057 }
4058
4059 fastrx.key = true;
4060 fastrx.icv_len = key->conf.icv_len;
4061 }
4062
4063 assign = true;
4064 clear_rcu:
4065 rcu_read_unlock();
4066 clear:
4067 __release(check_fast_rx);
4068
4069 if (assign)
4070 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
4071
4072 spin_lock_bh(&sta->lock);
4073 old = rcu_dereference_protected(sta->fast_rx, true);
4074 rcu_assign_pointer(sta->fast_rx, new);
4075 spin_unlock_bh(&sta->lock);
4076
4077 if (old)
4078 kfree_rcu(old, rcu_head);
4079}
4080
4081void ieee80211_clear_fast_rx(struct sta_info *sta)
4082{
4083 struct ieee80211_fast_rx *old;
4084
4085 spin_lock_bh(&sta->lock);
4086 old = rcu_dereference_protected(sta->fast_rx, true);
4087 RCU_INIT_POINTER(sta->fast_rx, NULL);
4088 spin_unlock_bh(&sta->lock);
4089
4090 if (old)
4091 kfree_rcu(old, rcu_head);
4092}
4093
4094void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4095{
4096 struct ieee80211_local *local = sdata->local;
4097 struct sta_info *sta;
4098
4099 lockdep_assert_held(&local->sta_mtx);
4100
4101 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4102 if (sdata != sta->sdata &&
4103 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
4104 continue;
4105 ieee80211_check_fast_rx(sta);
4106 }
4107}
4108
4109void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
4110{
4111 struct ieee80211_local *local = sdata->local;
4112
4113 mutex_lock(&local->sta_mtx);
4114 __ieee80211_check_fast_rx_iface(sdata);
4115 mutex_unlock(&local->sta_mtx);
4116}
4117
4118static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
4119 struct ieee80211_fast_rx *fast_rx)
4120{
4121 struct sk_buff *skb = rx->skb;
4122 struct ieee80211_hdr *hdr = (void *)skb->data;
4123 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4124 struct sta_info *sta = rx->sta;
4125 int orig_len = skb->len;
24bba078
FF		 4126 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
4127 int snap_offs = hdrlen;
49ddf8e6
JB		 4128 struct {
4129 u8 snap[sizeof(rfc1042_header)];
4130 __be16 proto;
4131 } *payload __aligned(2);
4132 struct {
4133 u8 da[ETH_ALEN];
4134 u8 sa[ETH_ALEN];
4135 } addrs __aligned(2);
c9c5962b
JB		 4136 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
4137
4138 if (fast_rx->uses_rss)
4139 stats = this_cpu_ptr(sta->pcpu_rx_stats);
49ddf8e6
JB		 4140
4141 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
4142 * to a common data structure; drivers can implement that per queue
4143 * but we don't have that information in mac80211
4144 */
4145 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
4146 return false;
4147
4148#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
4149
4150 /* If using encryption, we also need to have:
4151 * - PN_VALIDATED: similar, but the implementation is tricky
4152 * - DECRYPTED: necessary for PN_VALIDATED
4153 */
4154 if (fast_rx->key &&
4155 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
4156 return false;
4157
49ddf8e6
JB		 4158 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
4159 return false;
4160
4161 if (unlikely(ieee80211_is_frag(hdr)))
4162 return false;
4163
4164 /* Since our interface address cannot be multicast, this
4165 * implicitly also rejects multicast frames without the
4166 * explicit check.
4167 *
4168 * We shouldn't get any *data* frames not addressed to us
4169 * (AP mode will accept multicast *management* frames), but
4170 * punting here will make it go through the full checks in
4171 * ieee80211_accept_frame().
4172 */
4173 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
4174 return false;
4175
4176 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
4177 IEEE80211_FCTL_TODS)) !=
4178 fast_rx->expected_ds_bits)
b323ac19 4179 return false;
49ddf8e6
JB		 4180
4181 /* assign the key to drop unencrypted frames (later)
4182 * and strip the IV/MIC if necessary
4183 */
4184 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
4185 /* GCMP header length is the same */
4186 snap_offs += IEEE80211_CCMP_HDR_LEN;
4187 }
4188
24bba078
FF		 4189 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
4190 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
4191 goto drop;
49ddf8e6 4192
24bba078 4193 payload = (void *)(skb->data + snap_offs);
49ddf8e6 4194
24bba078
FF		 4195 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
4196 return false;
4197
4198 /* Don't handle these here since they require special code.
4199 * Accept AARP and IPX even though they should come with a
4200 * bridge-tunnel header - but if we get them this way then
4201 * there's little point in discarding them.
4202 */
4203 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
4204 payload->proto == fast_rx->control_port_protocol))
4205 return false;
4206 }
49ddf8e6
JB		 4207
4208 /* after this point, don't punt to the slowpath! */
4209
4210 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
4211 pskb_trim(skb, skb->len - fast_rx->icv_len))
4212 goto drop;
4213
4214 if (unlikely(fast_rx->sta_notify)) {
4215 ieee80211_sta_rx_notify(rx->sdata, hdr);
4216 fast_rx->sta_notify = false;
4217 }
4218
4219 /* statistics part of ieee80211_rx_h_sta_process() */
49ddf8e6 4220 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
c9c5962b
JB		 4221 stats->last_signal = status->signal;
4222 if (!fast_rx->uses_rss)
4223 ewma_signal_add(&sta->rx_stats_avg.signal,
4224 -status->signal);
49ddf8e6
JB		 4225 }
4226
4227 if (status->chains) {
4228 int i;
4229
c9c5962b 4230 stats->chains = status->chains;
49ddf8e6
JB		 4231 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
4232 int signal = status->chain_signal[i];
4233
4234 if (!(status->chains & BIT(i)))
4235 continue;
4236
c9c5962b
JB		 4237 stats->chain_signal_last[i] = signal;
4238 if (!fast_rx->uses_rss)
4239 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
4240 -signal);
49ddf8e6
JB		 4241 }
4242 }
4243 /* end of statistics */
4244
4245 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4246 goto drop;
4247
24bba078
FF		 4248 if (status->rx_flags & IEEE80211_RX_AMSDU) {
4249 if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) !=
4250 RX_QUEUED)
4251 goto drop;
4252
4253 return true;
4254 }
4255
4256 stats->last_rx = jiffies;
4257 stats->last_rate = sta_stats_encode_rate(status);
4258
4259 stats->fragments++;
4260 stats->packets++;
4261
49ddf8e6
JB		 4262 /* do the header conversion - first grab the addresses */
4263 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4264 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4265 /* remove the SNAP but leave the ethertype */
4266 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4267 /* push the addresses in front */
4268 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4269
4270 skb->dev = fast_rx->dev;
4271
4272 ieee80211_rx_stats(fast_rx->dev, skb->len);
4273
4274 /* The seqno index has the same property as needed
4275 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4276 * for non-QoS-data frames. Here we know it's a data
4277 * frame, so count MSDUs.
4278 */
c9c5962b
JB		 4279 u64_stats_update_begin(&stats->syncp);
4280 stats->msdu[rx->seqno_idx]++;
4281 stats->bytes += orig_len;
4282 u64_stats_update_end(&stats->syncp);
49ddf8e6
JB		 4283
4284 if (fast_rx->internal_forward) {
eeb0d56f 4285 struct sk_buff *xmit_skb = NULL;
42dca5ef 4286 if (is_multicast_ether_addr(addrs.da)) {
eeb0d56f 4287 xmit_skb = skb_copy(skb, GFP_ATOMIC);
42dca5ef
JB		 4288 } else if (!ether_addr_equal(addrs.da, addrs.sa) &&
4289 sta_info_get(rx->sdata, addrs.da)) {
eeb0d56f
JB		 4290 xmit_skb = skb;
4291 skb = NULL;
4292 }
49ddf8e6 4293
eeb0d56f 4294 if (xmit_skb) {
49ddf8e6
JB		 4295 /*
4296 * Send to wireless media and increase priority by 256
4297 * to keep the received priority instead of
4298 * reclassifying the frame (see cfg80211_classify8021d).
4299 */
eeb0d56f
JB		 4300 xmit_skb->priority += 256;
4301 xmit_skb->protocol = htons(ETH_P_802_3);
4302 skb_reset_network_header(xmit_skb);
4303 skb_reset_mac_header(xmit_skb);
4304 dev_queue_xmit(xmit_skb);
49ddf8e6 4305 }
eeb0d56f
JB		 4306
4307 if (!skb)
4308 return true;
49ddf8e6
JB		 4309 }
4310
4311 /* deliver to local stack */
4312 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4313 memset(skb->cb, 0, sizeof(skb->cb));
4314 if (rx->napi)
4315 napi_gro_receive(rx->napi, skb);
4316 else
4317 netif_receive_skb(skb);
4318
4319 return true;
4320 drop:
4321 dev_kfree_skb(skb);
c9c5962b 4322 stats->dropped++;
49ddf8e6
JB		 4323 return true;
4324}
4325
4406c376
JB		 4326/*
4327 * This function returns whether or not the SKB
4328 * was destined for RX processing or not, which,
4329 * if consume is true, is equivalent to whether
4330 * or not the skb was consumed.
4331 */
4332static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4333 struct sk_buff *skb, bool consume)
4334{
4335 struct ieee80211_local *local = rx->local;
4336 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 4337
4338 rx->skb = skb;
4406c376 4339
49ddf8e6
JB		 4340 /* See if we can do fast-rx; if we have to copy we already lost,
4341 * so punt in that case. We should never have to deliver a data
4342 * frame to multiple interfaces anyway.
4343 *
4344 * We skip the ieee80211_accept_frame() call and do the necessary
4345 * checking inside ieee80211_invoke_fast_rx().
4346 */
4347 if (consume && rx->sta) {
4348 struct ieee80211_fast_rx *fast_rx;
4349
4350 fast_rx = rcu_dereference(rx->sta->fast_rx);
4351 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4352 return true;
4353 }
4354
a58fbe1a 4355 if (!ieee80211_accept_frame(rx))
4406c376
JB		 4356 return false;
4357
4406c376
JB		 4358 if (!consume) {
4359 skb = skb_copy(skb, GFP_ATOMIC);
4360 if (!skb) {
4361 if (net_ratelimit())
4362 wiphy_debug(local->hw.wiphy,
b305dae4 4363 "failed to copy skb for %s\n",
4406c376
JB		 4364 sdata->name);
4365 return true;
4366 }
4367
4368 rx->skb = skb;
4369 }
4370
4371 ieee80211_invoke_rx_handlers(rx);
4372 return true;
4373}
4374
571ecf67 4375/*
6b59db7d 4376 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 4377 * be called with rcu_read_lock protection.
571ecf67 4378 */
71ebb4aa 4379static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
d63b548f 4380 struct ieee80211_sta *pubsta,
af9f9b22
JB		 4381 struct sk_buff *skb,
4382 struct napi_struct *napi)
571ecf67
JB		 4383{
4384 struct ieee80211_local *local = hw_to_local(hw);
4385 struct ieee80211_sub_if_data *sdata;
571ecf67 4386 struct ieee80211_hdr *hdr;
e3cf8b3f 4387 __le16 fc;
5cf121c3 4388 struct ieee80211_rx_data rx;
4406c376 4389 struct ieee80211_sub_if_data *prev;
83e7e4ce 4390 struct rhlist_head *tmp;
e3cf8b3f 4391 int err = 0;
571ecf67 4392
e3cf8b3f 4393 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 4394 memset(&rx, 0, sizeof(rx));
4395 rx.skb = skb;
4396 rx.local = local;
af9f9b22 4397 rx.napi = napi;
72abd81b 4398
e3cf8b3f 4399 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 4400 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 4401
4a4f1a58
JB		 4402 if (ieee80211_is_mgmt(fc)) {
4403 /* drop frame if too short for header */
4404 if (skb->len < ieee80211_hdrlen(fc))
4405 err = -ENOBUFS;
4406 else
4407 err = skb_linearize(skb);
4408 } else {
e3cf8b3f 4409 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 4410 }
e3cf8b3f
ZY		 4411
4412 if (err) {
4413 dev_kfree_skb(skb);
4414 return;
4415 }
4416
4417 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 4418 ieee80211_parse_qos(&rx);
d1c3a37c 4419 ieee80211_verify_alignment(&rx);
38f3714d 4420
d48b2968
JB		 4421 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4422 ieee80211_is_beacon(hdr->frame_control)))
4423 ieee80211_scan_rx(local, skb);
4424
19d19e96 4425 if (ieee80211_is_data(fc)) {
d63b548f 4426 struct sta_info *sta, *prev_sta;
7bedd0cf 4427
19d19e96
JB		 4428 if (pubsta) {
4429 rx.sta = container_of(pubsta, struct sta_info, sta);
4430 rx.sdata = rx.sta->sdata;
4431 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4432 return;
4433 goto out;
4434 }
4435
56af3268 4436 prev_sta = NULL;
4406c376 4437
83e7e4ce 4438 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 4439 if (!prev_sta) {
4440 prev_sta = sta;
4441 continue;
4442 }
4443
4444 rx.sta = prev_sta;
4445 rx.sdata = prev_sta->sdata;
4406c376 4446 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 4447
56af3268 4448 prev_sta = sta;
4406c376 4449 }
56af3268
BG		 4450
4451 if (prev_sta) {
4452 rx.sta = prev_sta;
4453 rx.sdata = prev_sta->sdata;
4454
4406c376 4455 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 4456 return;
8e26d5ad 4457 goto out;
56af3268 4458 }
4406c376
JB		 4459 }
4460
4b0dd98e 4461 prev = NULL;
b2e7771e 4462
4b0dd98e
JB		 4463 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4464 if (!ieee80211_sdata_running(sdata))
4465 continue;
340e11f3 4466
4b0dd98e
JB		 4467 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4468 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4469 continue;
340e11f3 4470
4b0dd98e
JB		 4471 /*
4472 * frame is destined for this interface, but if it's
4473 * not also for the previous one we handle that after
4474 * the loop to avoid copying the SKB once too much
4475 */
4bb29f8c 4476
4b0dd98e 4477 if (!prev) {
abe60632 4478 prev = sdata;
4b0dd98e 4479 continue;
340e11f3 4480 }
4bb29f8c 4481
7852e361 4482 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 4483 rx.sdata = prev;
4484 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 4485
4b0dd98e
JB		 4486 prev = sdata;
4487 }
4488
4489 if (prev) {
7852e361 4490 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 4491 rx.sdata = prev;
4406c376 4492
4b0dd98e
JB		 4493 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4494 return;
571ecf67 4495 }
4406c376 4496
8e26d5ad 4497 out:
4406c376 4498 dev_kfree_skb(skb);
571ecf67 4499}
6368e4b1
RR		 4500
4501/*
4502 * This is the receive path handler. It is called by a low level driver when an
4503 * 802.11 MPDU is received from the hardware.
4504 */
d63b548f
JB		 4505void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4506 struct sk_buff *skb, struct napi_struct *napi)
6368e4b1
RR		 4507{
4508 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 4509 struct ieee80211_rate *rate = NULL;
4510 struct ieee80211_supported_band *sband;
f1d58c25 4511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 4512
d20ef63d
JB		 4513 WARN_ON_ONCE(softirq_count() == 0);
4514
57fbcce3 4515 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
77a980dc 4516 goto drop;
8318d78a
JB		 4517
4518 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 4519 if (WARN_ON(!sband))
4520 goto drop;
8318d78a 4521
89c3a8ac
JB		 4522 /*
4523 * If we're suspending, it is possible although not too likely
4524 * that we'd be receiving frames after having already partially
4525 * quiesced the stack. We can't process such frames then since
4526 * that might, for example, cause stations to be added or other
4527 * driver callbacks be invoked.
4528 */
77a980dc
JB		 4529 if (unlikely(local->quiescing || local->suspended))
4530 goto drop;
89c3a8ac 4531
04800ada
AN		 4532 /* We might be during a HW reconfig, prevent Rx for the same reason */
4533 if (unlikely(local->in_reconfig))
4534 goto drop;
4535
ea77f12f
JB		 4536 /*
4537 * The same happens when we're not even started,
4538 * but that's worth a warning.
4539 */
77a980dc
JB		 4540 if (WARN_ON(!local->started))
4541 goto drop;
ea77f12f 4542
fc885189 4543 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 4544 /*
fc885189
JB		 4545 * Validate the rate, unless a PLCP error means that
4546 * we probably can't have a valid rate here anyway.
e5d6eb83 4547 */
fc885189 4548
da6a4352
JB		 4549 switch (status->encoding) {
4550 case RX_ENC_HT:
fc885189
JB		 4551 /*
4552 * rate_idx is MCS index, which can be [0-76]
4553 * as documented on:
4554 *
4555 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4556 *
4557 * Anything else would be some sort of driver or
4558 * hardware error. The driver should catch hardware
4559 * errors.
4560 */
444e3803 4561 if (WARN(status->rate_idx > 76,
fc885189
JB		 4562 "Rate marked as an HT rate but passed "
4563 "status->rate_idx is not "
4564 "an MCS index [0-76]: %d (0x%02x)\n",
4565 status->rate_idx,
4566 status->rate_idx))
4567 goto drop;
da6a4352
JB		 4568 break;
4569 case RX_ENC_VHT:
5614618e 4570 if (WARN_ONCE(status->rate_idx > 9 ||
8613c948
JB		 4571 !status->nss ||
4572 status->nss > 8,
5614618e 4573 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
8613c948 4574 status->rate_idx, status->nss))
5614618e 4575 goto drop;
da6a4352 4576 break;
41cbb0f5
LC		 4577 case RX_ENC_HE:
4578 if (WARN_ONCE(status->rate_idx > 11 ||
4579 !status->nss ||
4580 status->nss > 8,
4581 "Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n",
4582 status->rate_idx, status->nss))
4583 goto drop;
4584 break;
da6a4352
JB		 4585 default:
4586 WARN_ON_ONCE(1);
4587 /* fall through */
4588 case RX_ENC_LEGACY:
444e3803 4589 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 4590 goto drop;
4591 rate = &sband->bitrates[status->rate_idx];
4592 }
0fb8ca45 4593 }
6368e4b1 4594
554891e6
JB		 4595 status->rx_flags = 0;
4596
6368e4b1
RR		 4597 /*
4598 * key references and virtual interfaces are protected using RCU
4599 * and this requires that we are in a read-side RCU section during
4600 * receive processing
4601 */
4602 rcu_read_lock();
4603
4604 /*
4605 * Frames with failed FCS/PLCP checksum are not returned,
4606 * all other frames are returned without radiotap header
4607 * if it was previously present.
4608 * Also, frames with less than 16 bytes are dropped.
4609 */
f1d58c25 4610 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 4611 if (!skb) {
4612 rcu_read_unlock();
4613 return;
4614 }
4615
e1e54068
JB		 4616 ieee80211_tpt_led_trig_rx(local,
4617 ((struct ieee80211_hdr *)skb->data)->frame_control,
4618 skb->len);
d63b548f
JB		 4619
4620 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
6368e4b1
RR		 4621
4622 rcu_read_unlock();
77a980dc
JB		 4623
4624 return;
4625 drop:
4626 kfree_skb(skb);
6368e4b1 4627}
af9f9b22 4628EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 4629
4630/* This is a version of the rx handler that can be called from hard irq
4631 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 4632void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 4633{
4634 struct ieee80211_local *local = hw_to_local(hw);
4635
4636 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4637
571ecf67
JB		 4638 skb->pkt_type = IEEE80211_RX_MSG;
4639 skb_queue_tail(&local->skb_queue, skb);
4640 tasklet_schedule(&local->tasklet);
4641}
4642EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Ubuntu Jammy Linux kernel mirror