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net: Fix build regression in rtl8723bs staging driver.
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
b7540d8f 7 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
571ecf67
JB		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
ab46623e 14#include <linux/jiffies.h>
5a0e3ad6 15#include <linux/slab.h>
571ecf67
JB		 16#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
d4e46a3d 20#include <linux/rcupdate.h>
bc3b2d7f 21#include <linux/export.h>
06470f74 22#include <linux/bitops.h>
571ecf67
JB		 23#include <net/mac80211.h>
24#include <net/ieee80211_radiotap.h>
d26ad377 25#include <asm/unaligned.h>
571ecf67
JB		 26
27#include "ieee80211_i.h"
24487981 28#include "driver-ops.h"
2c8dccc7 29#include "led.h"
33b64eb2 30#include "mesh.h"
571ecf67
JB		 31#include "wep.h"
32#include "wpa.h"
33#include "tkip.h"
34#include "wme.h"
1d8d3dec 35#include "rate.h"
571ecf67 36
5a490510
JB		 37static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
38{
39 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
40
41 u64_stats_update_begin(&tstats->syncp);
42 tstats->rx_packets++;
43 tstats->rx_bytes += len;
44 u64_stats_update_end(&tstats->syncp);
45}
46
a6828493
JB		 47static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
49{
50 __le16 fc = hdr->frame_control;
51
52 if (ieee80211_is_data(fc)) {
53 if (len < 24) /* drop incorrect hdr len (data) */
54 return NULL;
55
56 if (ieee80211_has_a4(fc))
57 return NULL;
58 if (ieee80211_has_tods(fc))
59 return hdr->addr1;
60 if (ieee80211_has_fromds(fc))
61 return hdr->addr2;
62
63 return hdr->addr3;
64 }
65
66 if (ieee80211_is_mgmt(fc)) {
67 if (len < 24) /* drop incorrect hdr len (mgmt) */
68 return NULL;
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_ctl(fc)) {
73 if (ieee80211_is_pspoll(fc))
74 return hdr->addr1;
75
76 if (ieee80211_is_back_req(fc)) {
77 switch (type) {
78 case NL80211_IFTYPE_STATION:
79 return hdr->addr2;
80 case NL80211_IFTYPE_AP:
81 case NL80211_IFTYPE_AP_VLAN:
82 return hdr->addr1;
83 default:
84 break; /* fall through to the return */
85 }
86 }
87 }
88
89 return NULL;
90}
91
b2e7771e
JB		 92/*
93 * monitor mode reception
94 *
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
97 */
30841f5c
JB		 98static void remove_monitor_info(struct sk_buff *skb,
99 unsigned int present_fcs_len,
100 unsigned int rtap_vendor_space)
b2e7771e 101{
30841f5c
JB		 102 if (present_fcs_len)
103 __pskb_trim(skb, skb->len - present_fcs_len);
1f7bba79 104 __pskb_pull(skb, rtap_vendor_space);
b2e7771e
JB		 105}
106
1f7bba79
JB		 107static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
108 unsigned int rtap_vendor_space)
b2e7771e 109{
f1d58c25 110 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 111 struct ieee80211_hdr *hdr;
112
113 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 114
4c298677 115 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
17883048
GB		 116 RX_FLAG_FAILED_PLCP_CRC |
117 RX_FLAG_ONLY_MONITOR))
6b59db7d
ZG		 118 return true;
119
1f7bba79 120 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 121 return true;
122
87228f57
HH		 123 if (ieee80211_is_ctl(hdr->frame_control) &&
124 !ieee80211_is_pspoll(hdr->frame_control) &&
125 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 126 return true;
127
128 return false;
b2e7771e
JB		 129}
130
601ae7f2 131static int
1f7bba79
JB		 132ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
133 struct ieee80211_rx_status *status,
134 struct sk_buff *skb)
601ae7f2
BR		 135{
136 int len;
137
138 /* always present fields */
a144f378 139 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 140
a144f378 141 /* allocate extra bitmaps */
a144f378
JB		 142 if (status->chains)
143 len += 4 * hweight8(status->chains);
90b9e446
JB		 144
145 if (ieee80211_have_rx_timestamp(status)) {
146 len = ALIGN(len, 8);
601ae7f2 147 len += 8;
90b9e446 148 }
30686bf7 149 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 150 len += 1;
601ae7f2 151
a144f378
JB		 152 /* antenna field, if we don't have per-chain info */
153 if (!status->chains)
154 len += 1;
155
90b9e446
JB		 156 /* padding for RX_FLAGS if necessary */
157 len = ALIGN(len, 2);
601ae7f2 158
da6a4352 159 if (status->encoding == RX_ENC_HT) /* HT info */
6d744bac
JB		 160 len += 3;
161
4c298677 162 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 163 len = ALIGN(len, 4);
4c298677
JB		 164 len += 8;
165 }
166
da6a4352 167 if (status->encoding == RX_ENC_VHT) {
51648921
JB		 168 len = ALIGN(len, 2);
169 len += 12;
170 }
171
99ee7cae
JB		 172 if (local->hw.radiotap_timestamp.units_pos >= 0) {
173 len = ALIGN(len, 8);
174 len += 12;
175 }
176
a144f378
JB		 177 if (status->chains) {
178 /* antenna and antenna signal fields */
179 len += 2 * hweight8(status->chains);
180 }
181
1f7bba79
JB		 182 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
183 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
184
185 /* vendor presence bitmap */
186 len += 4;
187 /* alignment for fixed 6-byte vendor data header */
188 len = ALIGN(len, 2);
189 /* vendor data header */
190 len += 6;
191 if (WARN_ON(rtap->align == 0))
192 rtap->align = 1;
193 len = ALIGN(len, rtap->align);
194 len += rtap->len + rtap->pad;
195 }
196
601ae7f2
BR		 197 return len;
198}
199
9e478066
JB		 200static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
201 struct sk_buff *skb,
202 int rtap_vendor_space)
203{
204 struct {
205 struct ieee80211_hdr_3addr hdr;
206 u8 category;
207 u8 action_code;
208 } __packed action;
209
210 if (!sdata)
211 return;
212
213 BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
214
215 if (skb->len < rtap_vendor_space + sizeof(action) +
216 VHT_MUMIMO_GROUPS_DATA_LEN)
217 return;
218
219 if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
220 return;
221
222 skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
223
224 if (!ieee80211_is_action(action.hdr.frame_control))
225 return;
226
227 if (action.category != WLAN_CATEGORY_VHT)
228 return;
229
230 if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
231 return;
232
233 if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
234 return;
235
236 skb = skb_copy(skb, GFP_ATOMIC);
237 if (!skb)
238 return;
239
240 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
241 skb_queue_tail(&sdata->skb_queue, skb);
242 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
243}
244
00ea6deb 245/*
601ae7f2
BR		 246 * ieee80211_add_rx_radiotap_header - add radiotap header
247 *
248 * add a radiotap header containing all the fields which the hardware provided.
249 */
250static void
251ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
252 struct sk_buff *skb,
601ae7f2 253 struct ieee80211_rate *rate,
973ef21a 254 int rtap_len, bool has_fcs)
601ae7f2 255{
f1d58c25 256 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 257 struct ieee80211_radiotap_header *rthdr;
258 unsigned char *pos;
a144f378
JB		 259 __le32 *it_present;
260 u32 it_present_val;
6a86b9c7 261 u16 rx_flags = 0;
a5e70697 262 u16 channel_flags = 0;
a144f378
JB		 263 int mpdulen, chain;
264 unsigned long chains = status->chains;
1f7bba79
JB		 265 struct ieee80211_vendor_radiotap rtap = {};
266
267 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
268 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
269 /* rtap.len and rtap.pad are undone immediately */
270 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
271 }
f4bda337
TP		 272
273 mpdulen = skb->len;
30686bf7 274 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 275 mpdulen += FCS_LEN;
601ae7f2
BR		 276
277 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 278 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 279 it_present = &rthdr->it_present;
601ae7f2
BR		 280
281 /* radiotap header, set always present flags */
0059b2b1 282 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 283 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
284 BIT(IEEE80211_RADIOTAP_CHANNEL) |
285 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
286
287 if (!status->chains)
288 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
289
290 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
291 it_present_val |=
292 BIT(IEEE80211_RADIOTAP_EXT) |
293 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
294 put_unaligned_le32(it_present_val, it_present);
295 it_present++;
296 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
297 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
298 }
601ae7f2 299
1f7bba79
JB		 300 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
301 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
302 BIT(IEEE80211_RADIOTAP_EXT);
303 put_unaligned_le32(it_present_val, it_present);
304 it_present++;
305 it_present_val = rtap.present;
306 }
307
a144f378
JB		 308 put_unaligned_le32(it_present_val, it_present);
309
310 pos = (void *)(it_present + 1);
311
601ae7f2
BR		 312 /* the order of the following fields is important */
313
314 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 315 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 316 /* padding */
317 while ((pos - (u8 *)rthdr) & 7)
318 *pos++ = 0;
f4bda337
TP		 319 put_unaligned_le64(
320 ieee80211_calculate_rx_timestamp(local, status,
321 mpdulen, 0),
322 pos);
1df332e8 323 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 324 pos += 8;
325 }
326
327 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 328 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 329 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 330 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
331 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
7fdd69c5 332 if (status->enc_flags & RX_ENC_FLAG_SHORTPRE)
b4f28bbb 333 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 334 pos++;
335
336 /* IEEE80211_RADIOTAP_RATE */
da6a4352 337 if (!rate || status->encoding != RX_ENC_LEGACY) {
0fb8ca45 338 /*
f8d1ccf1 339 * Without rate information don't add it. If we have,
38f37be2 340 * MCS information is a separate field in radiotap,
73b48099
JB		 341 * added below. The byte here is needed as padding
342 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 343 */
344 *pos = 0;
8d6f658e 345 } else {
2103dec1 346 int shift = 0;
ebe6c7ba 347 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
da6a4352 348 if (status->bw == RATE_INFO_BW_10)
2103dec1 349 shift = 1;
da6a4352 350 else if (status->bw == RATE_INFO_BW_5)
2103dec1
SW		 351 shift = 2;
352 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 353 }
601ae7f2
BR		 354 pos++;
355
356 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 357 put_unaligned_le16(status->freq, pos);
601ae7f2 358 pos += 2;
da6a4352 359 if (status->bw == RATE_INFO_BW_10)
a5e70697 360 channel_flags |= IEEE80211_CHAN_HALF;
da6a4352 361 else if (status->bw == RATE_INFO_BW_5)
a5e70697
SW		 362 channel_flags |= IEEE80211_CHAN_QUARTER;
363
57fbcce3 364 if (status->band == NL80211_BAND_5GHZ)
a5e70697 365 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
da6a4352 366 else if (status->encoding != RX_ENC_LEGACY)
a5e70697 367 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 368 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 369 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 370 else if (rate)
3a5c5e81 371 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 372 else
a5e70697
SW		 373 channel_flags |= IEEE80211_CHAN_2GHZ;
374 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 375 pos += 2;
376
377 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 378 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 379 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 380 *pos = status->signal;
381 rthdr->it_present |=
382 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
383 pos++;
384 }
385
601ae7f2
BR		 386 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
387
a144f378
JB		 388 if (!status->chains) {
389 /* IEEE80211_RADIOTAP_ANTENNA */
390 *pos = status->antenna;
391 pos++;
392 }
601ae7f2 393
601ae7f2
BR		 394 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
395
396 /* IEEE80211_RADIOTAP_RX_FLAGS */
397 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 398 if ((pos - (u8 *)rthdr) & 1)
90b9e446 399 *pos++ = 0;
aae89831 400 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 401 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
402 put_unaligned_le16(rx_flags, pos);
601ae7f2 403 pos += 2;
6d744bac 404
da6a4352 405 if (status->encoding == RX_ENC_HT) {
786677d1
OR		 406 unsigned int stbc;
407
6d744bac 408 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 409 *pos++ = local->hw.radiotap_mcs_details;
6d744bac 410 *pos = 0;
7fdd69c5 411 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
6d744bac 412 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
da6a4352 413 if (status->bw == RATE_INFO_BW_40)
6d744bac 414 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
7fdd69c5 415 if (status->enc_flags & RX_ENC_FLAG_HT_GF)
ac55d2fe 416 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
7fdd69c5 417 if (status->enc_flags & RX_ENC_FLAG_LDPC)
63c361f5 418 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
7fdd69c5 419 stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT;
786677d1 420 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 421 pos++;
422 *pos++ = status->rate_idx;
423 }
4c298677
JB		 424
425 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
426 u16 flags = 0;
427
428 /* ensure 4 byte alignment */
429 while ((pos - (u8 *)rthdr) & 3)
430 pos++;
431 rthdr->it_present |=
432 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
433 put_unaligned_le32(status->ampdu_reference, pos);
434 pos += 4;
4c298677
JB		 435 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
436 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
437 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
438 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
439 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
440 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
441 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
442 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
443 put_unaligned_le16(flags, pos);
444 pos += 2;
445 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
446 *pos++ = status->ampdu_delimiter_crc;
447 else
448 *pos++ = 0;
449 *pos++ = 0;
450 }
90b9e446 451
da6a4352 452 if (status->encoding == RX_ENC_VHT) {
51648921
JB		 453 u16 known = local->hw.radiotap_vht_details;
454
455 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 456 put_unaligned_le16(known, pos);
457 pos += 2;
458 /* flags */
7fdd69c5 459 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
51648921 460 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5 461 /* in VHT, STBC is binary */
7fdd69c5 462 if (status->enc_flags & RX_ENC_FLAG_STBC_MASK)
63c361f5 463 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
7fdd69c5 464 if (status->enc_flags & RX_ENC_FLAG_BF)
fb378c23 465 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 466 pos++;
467 /* bandwidth */
da6a4352
JB		 468 switch (status->bw) {
469 case RATE_INFO_BW_80:
51648921 470 *pos++ = 4;
da6a4352
JB		 471 break;
472 case RATE_INFO_BW_160:
51648921 473 *pos++ = 11;
da6a4352
JB		 474 break;
475 case RATE_INFO_BW_40:
51648921 476 *pos++ = 1;
da6a4352
JB		 477 break;
478 default:
51648921 479 *pos++ = 0;
da6a4352 480 }
51648921 481 /* MCS/NSS */
8613c948 482 *pos = (status->rate_idx << 4) | status->nss;
51648921
JB		 483 pos += 4;
484 /* coding field */
7fdd69c5 485 if (status->enc_flags & RX_ENC_FLAG_LDPC)
63c361f5 486 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 487 pos++;
488 /* group ID */
489 pos++;
490 /* partial_aid */
491 pos += 2;
492 }
493
99ee7cae
JB		 494 if (local->hw.radiotap_timestamp.units_pos >= 0) {
495 u16 accuracy = 0;
496 u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT;
497
498 rthdr->it_present |=
499 cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP);
500
501 /* ensure 8 byte alignment */
502 while ((pos - (u8 *)rthdr) & 7)
503 pos++;
504
505 put_unaligned_le64(status->device_timestamp, pos);
506 pos += sizeof(u64);
507
508 if (local->hw.radiotap_timestamp.accuracy >= 0) {
509 accuracy = local->hw.radiotap_timestamp.accuracy;
510 flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY;
511 }
512 put_unaligned_le16(accuracy, pos);
513 pos += sizeof(u16);
514
515 *pos++ = local->hw.radiotap_timestamp.units_pos;
516 *pos++ = flags;
517 }
518
a144f378
JB		 519 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
520 *pos++ = status->chain_signal[chain];
521 *pos++ = chain;
522 }
1f7bba79
JB		 523
524 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
525 /* ensure 2 byte alignment for the vendor field as required */
526 if ((pos - (u8 *)rthdr) & 1)
527 *pos++ = 0;
528 *pos++ = rtap.oui[0];
529 *pos++ = rtap.oui[1];
530 *pos++ = rtap.oui[2];
531 *pos++ = rtap.subns;
532 put_unaligned_le16(rtap.len, pos);
533 pos += 2;
534 /* align the actual payload as requested */
535 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
536 *pos++ = 0;
537 /* data (and possible padding) already follows */
538 }
601ae7f2
BR		 539}
540
127f60bf
JB		 541static struct sk_buff *
542ieee80211_make_monitor_skb(struct ieee80211_local *local,
543 struct sk_buff **origskb,
544 struct ieee80211_rate *rate,
545 int rtap_vendor_space, bool use_origskb)
546{
547 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb);
548 int rt_hdrlen, needed_headroom;
549 struct sk_buff *skb;
550
551 /* room for the radiotap header based on driver features */
552 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb);
553 needed_headroom = rt_hdrlen - rtap_vendor_space;
554
555 if (use_origskb) {
556 /* only need to expand headroom if necessary */
557 skb = *origskb;
558 *origskb = NULL;
559
560 /*
561 * This shouldn't trigger often because most devices have an
562 * RX header they pull before we get here, and that should
563 * be big enough for our radiotap information. We should
564 * probably export the length to drivers so that we can have
565 * them allocate enough headroom to start with.
566 */
567 if (skb_headroom(skb) < needed_headroom &&
568 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
569 dev_kfree_skb(skb);
570 return NULL;
571 }
572 } else {
573 /*
574 * Need to make a copy and possibly remove radiotap header
575 * and FCS from the original.
576 */
577 skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC);
578
579 if (!skb)
580 return NULL;
581 }
582
583 /* prepend radiotap information */
584 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
585
586 skb_reset_mac_header(skb);
587 skb->ip_summed = CHECKSUM_UNNECESSARY;
588 skb->pkt_type = PACKET_OTHERHOST;
589 skb->protocol = htons(ETH_P_802_2);
590
591 return skb;
592}
593
b2e7771e
JB		 594/*
595 * This function copies a received frame to all monitor interfaces and
596 * returns a cleaned-up SKB that no longer includes the FCS nor the
597 * radiotap header the driver might have added.
598 */
599static struct sk_buff *
600ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 601 struct ieee80211_rate *rate)
b2e7771e 602{
f1d58c25 603 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 604 struct ieee80211_sub_if_data *sdata;
127f60bf 605 struct sk_buff *monskb = NULL;
b2e7771e 606 int present_fcs_len = 0;
1f7bba79 607 unsigned int rtap_vendor_space = 0;
42bd20d9
AE		 608 struct ieee80211_sub_if_data *monitor_sdata =
609 rcu_dereference(local->monitor_sdata);
127f60bf 610 bool only_monitor = false;
1f7bba79
JB		 611
612 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
613 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
614
615 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
616 }
b2e7771e
JB		 617
618 /*
619 * First, we may need to make a copy of the skb because
620 * (1) we need to modify it for radiotap (if not present), and
621 * (2) the other RX handlers will modify the skb we got.
622 *
623 * We don't need to, of course, if we aren't going to return
624 * the SKB because it has a bad FCS/PLCP checksum.
625 */
0869aea0 626
30841f5c
JB		 627 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
628 if (unlikely(origskb->len <= FCS_LEN)) {
629 /* driver bug */
630 WARN_ON(1);
631 dev_kfree_skb(origskb);
632 return NULL;
633 }
b2e7771e 634 present_fcs_len = FCS_LEN;
30841f5c 635 }
b2e7771e 636
1f7bba79
JB		 637 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
638 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 639 dev_kfree_skb(origskb);
640 return NULL;
641 }
642
127f60bf
JB		 643 only_monitor = should_drop_frame(origskb, present_fcs_len,
644 rtap_vendor_space);
645
17883048 646 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
127f60bf 647 if (only_monitor) {
b2e7771e
JB		 648 dev_kfree_skb(origskb);
649 return NULL;
650 }
651
30841f5c
JB		 652 remove_monitor_info(origskb, present_fcs_len,
653 rtap_vendor_space);
654 return origskb;
b2e7771e
JB		 655 }
656
9e478066
JB		 657 ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
658
f64331d5 659 list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) {
127f60bf
JB		 660 bool last_monitor = list_is_last(&sdata->u.mntr.list,
661 &local->mon_list);
662
663 if (!monskb)
664 monskb = ieee80211_make_monitor_skb(local, &origskb,
665 rate,
666 rtap_vendor_space,
667 only_monitor &&
668 last_monitor);
669
670 if (monskb) {
671 struct sk_buff *skb;
672
673 if (last_monitor) {
674 skb = monskb;
675 monskb = NULL;
676 } else {
677 skb = skb_clone(monskb, GFP_ATOMIC);
678 }
679
680 if (skb) {
681 skb->dev = sdata->dev;
682 ieee80211_rx_stats(skb->dev, skb->len);
683 netif_receive_skb(skb);
b2e7771e
JB		 684 }
685 }
686
127f60bf
JB		 687 if (last_monitor)
688 break;
b2e7771e
JB		 689 }
690
127f60bf
JB		 691 /* this happens if last_monitor was erroneously false */
692 dev_kfree_skb(monskb);
693
694 /* ditto */
695 if (!origskb)
696 return NULL;
b2e7771e 697
127f60bf 698 remove_monitor_info(origskb, present_fcs_len, rtap_vendor_space);
b2e7771e
JB		 699 return origskb;
700}
701
5cf121c3 702static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 703{
238f74a2 704 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 705 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 706 int tid, seqno_idx, security_idx;
6e0d114d
JB		 707
708 /* does the frame have a qos control field? */
238f74a2
HH		 709 if (ieee80211_is_data_qos(hdr->frame_control)) {
710 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 711 /* frame has qos control */
238f74a2 712 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 713 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 714 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 715
716 seqno_idx = tid;
717 security_idx = tid;
6e0d114d 718 } else {
1411f9b5
JB		 719 /*
720 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
721 *
722 * Sequence numbers for management frames, QoS data
723 * frames with a broadcast/multicast address in the
724 * Address 1 field, and all non-QoS data frames sent
725 * by QoS STAs are assigned using an additional single
726 * modulo-4096 counter, [...]
727 *
728 * We also use that counter for non-QoS STAs.
729 */
5a306f58 730 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 731 security_idx = 0;
732 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 733 security_idx = IEEE80211_NUM_TIDS;
9e26297a 734 tid = 0;
6e0d114d 735 }
52865dfd 736
9e26297a
JB		 737 rx->seqno_idx = seqno_idx;
738 rx->security_idx = security_idx;
6e0d114d
JB		 739 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
740 * For now, set skb->priority to 0 for other cases. */
741 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 742}
6e0d114d 743
d1c3a37c
JB		 744/**
745 * DOC: Packet alignment
746 *
747 * Drivers always need to pass packets that are aligned to two-byte boundaries
748 * to the stack.
749 *
750 * Additionally, should, if possible, align the payload data in a way that
751 * guarantees that the contained IP header is aligned to a four-byte
752 * boundary. In the case of regular frames, this simply means aligning the
753 * payload to a four-byte boundary (because either the IP header is directly
754 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 755 * in front of it). If the payload data is not properly aligned and the
756 * architecture doesn't support efficient unaligned operations, mac80211
757 * will align the data.
d1c3a37c
JB		 758 *
759 * With A-MSDU frames, however, the payload data address must yield two modulo
760 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
761 * push the IP header further back to a multiple of four again. Thankfully, the
762 * specs were sane enough this time around to require padding each A-MSDU
763 * subframe to a length that is a multiple of four.
764 *
25985edc 765 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 766 * the payload is not supported, the driver is required to move the 802.11
767 * header to be directly in front of the payload in that case.
768 */
769static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 770{
59d9cb07 771#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 772 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 773#endif
6e0d114d
JB		 774}
775
6368e4b1 776
571ecf67
JB		 777/* rx handlers */
778
3cfcf6ac
JM		 779static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
780{
781 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
782
d8ca16db 783 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 784 return 0;
785
d8ca16db 786 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 787}
788
789
790static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
791{
792 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
793
d8ca16db 794 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 795 return 0;
796
d8ca16db 797 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 798}
799
800
801/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
802static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
803{
804 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
805 struct ieee80211_mmie *mmie;
56c52da2 806 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 807
1df332e8 808 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 809 return -1;
810
d8ca16db 811 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 812 return -1; /* not a robust management frame */
813
814 mmie = (struct ieee80211_mmie *)
815 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 816 if (mmie->element_id == WLAN_EID_MMIE &&
817 mmie->length == sizeof(*mmie) - 2)
818 return le16_to_cpu(mmie->key_id);
819
820 mmie16 = (struct ieee80211_mmie_16 *)
821 (skb->data + skb->len - sizeof(*mmie16));
822 if (skb->len >= 24 + sizeof(*mmie16) &&
823 mmie16->element_id == WLAN_EID_MMIE &&
824 mmie16->length == sizeof(*mmie16) - 2)
825 return le16_to_cpu(mmie16->key_id);
826
827 return -1;
3cfcf6ac
JM		 828}
829
2c61cf9c
JB		 830static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
831 struct sk_buff *skb)
2475b1cc
MS		 832{
833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
834 __le16 fc;
835 int hdrlen;
836 u8 keyid;
837
838 fc = hdr->frame_control;
839 hdrlen = ieee80211_hdrlen(fc);
840
841 if (skb->len < hdrlen + cs->hdr_len)
842 return -EINVAL;
843
844 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
845 keyid &= cs->key_idx_mask;
846 keyid >>= cs->key_idx_shift;
847
848 return keyid;
849}
850
1df332e8 851static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 852{
a7767f95 853 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 854 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 855
a7767f95 856 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 857 if (is_multicast_ether_addr(hdr->addr1)) {
858 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 859 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 860 return RX_DROP_MONITOR;
b203ca39 861 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 862 return RX_DROP_MONITOR;
863 } else {
864 if (!ieee80211_has_a4(hdr->frame_control))
865 return RX_DROP_MONITOR;
b203ca39 866 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 867 return RX_DROP_MONITOR;
868 }
33b64eb2
LCC		 869 }
870
871 /* If there is not an established peer link and this is not a peer link
872 * establisment frame, beacon or probe, drop the frame.
873 */
874
57cf8043 875 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 876 struct ieee80211_mgmt *mgmt;
d6d1a5a7 877
a7767f95 878 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 879 return RX_DROP_MONITOR;
880
a7767f95 881 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 882 u8 category;
9b395bc3
JB		 883
884 /* make sure category field is present */
885 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
886 return RX_DROP_MONITOR;
887
33b64eb2 888 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 889 category = mgmt->u.action.category;
890 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 891 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 892 return RX_DROP_MONITOR;
33b64eb2 893 return RX_CONTINUE;
33b64eb2
LCC		 894 }
895
a7767f95
HH		 896 if (ieee80211_is_probe_req(hdr->frame_control) ||
897 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 898 ieee80211_is_beacon(hdr->frame_control) ||
899 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 900 return RX_CONTINUE;
901
902 return RX_DROP_MONITOR;
a7767f95
HH		 903 }
904
902acc78
JB		 905 return RX_CONTINUE;
906}
33b64eb2 907
fb4ea054
JB		 908static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
909 int index)
910{
911 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
912 struct sk_buff *tail = skb_peek_tail(frames);
913 struct ieee80211_rx_status *status;
914
06470f74
SS		 915 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
916 return true;
917
fb4ea054
JB		 918 if (!tail)
919 return false;
920
921 status = IEEE80211_SKB_RXCB(tail);
922 if (status->flag & RX_FLAG_AMSDU_MORE)
923 return false;
924
925 return true;
926}
927
d3b2fb53 928static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 929 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 930 int index,
931 struct sk_buff_head *frames)
1edfb1af 932{
83eb935e
MK		 933 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
934 struct sk_buff *skb;
4cfda47b 935 struct ieee80211_rx_status *status;
1edfb1af 936
dd318575
JB		 937 lockdep_assert_held(&tid_agg_rx->reorder_lock);
938
83eb935e 939 if (skb_queue_empty(skb_list))
1edfb1af
JB		 940 goto no_frame;
941
fb4ea054 942 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
83eb935e
MK		 943 __skb_queue_purge(skb_list);
944 goto no_frame;
945 }
946
947 /* release frames from the reorder ring buffer */
1edfb1af 948 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 949 while ((skb = __skb_dequeue(skb_list))) {
950 status = IEEE80211_SKB_RXCB(skb);
951 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
952 __skb_queue_tail(frames, skb);
953 }
1edfb1af
JB		 954
955no_frame:
06470f74 956 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
9a886586 957 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 958}
959
d3b2fb53 960static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 961 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 962 u16 head_seq_num,
963 struct sk_buff_head *frames)
1edfb1af
JB		 964{
965 int index;
966
dd318575
JB		 967 lockdep_assert_held(&tid_agg_rx->reorder_lock);
968
9a886586 969 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 970 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 971 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
972 frames);
1edfb1af
JB		 973 }
974}
975
976/*
977 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
978 * the skb was added to the buffer longer than this time ago, the earlier
979 * frames that have not yet been received are assumed to be lost and the skb
980 * can be released for processing. This may also release other skb's from the
981 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 982 *
983 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 984 */
985#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
986
d3b2fb53 987static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 988 struct tid_ampdu_rx *tid_agg_rx,
989 struct sk_buff_head *frames)
aa0c8636 990{
83eb935e 991 int index, i, j;
aa0c8636 992
dd318575
JB		 993 lockdep_assert_held(&tid_agg_rx->reorder_lock);
994
aa0c8636 995 /* release the buffer until next missing frame */
2e3049b7 996 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
fb4ea054 997 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
07ae2dfc 998 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 999 /*
1000 * No buffers ready to be released, but check whether any
1001 * frames in the reorder buffer have timed out.
1002 */
aa0c8636
CL		 1003 int skipped = 1;
1004 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
1005 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 1006 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
aa0c8636
CL		 1007 skipped++;
1008 continue;
1009 }
499fe9a4
DH		 1010 if (skipped &&
1011 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 1012 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 1013 goto set_release_timer;
aa0c8636 1014
83eb935e
MK		 1015 /* don't leave incomplete A-MSDUs around */
1016 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
1017 i = (i + 1) % tid_agg_rx->buf_size)
1018 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
1019
bdcbd8e0
JB		 1020 ht_dbg_ratelimited(sdata,
1021 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 1022 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
1023 frames);
aa0c8636
CL		 1024
1025 /*
1026 * Increment the head seq# also for the skipped slots.
1027 */
1028 tid_agg_rx->head_seq_num =
9a886586
JB		 1029 (tid_agg_rx->head_seq_num +
1030 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 1031 skipped = 0;
1032 }
fb4ea054 1033 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
f9e124fb
CL		 1034 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
1035 frames);
2e3049b7 1036 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 1037 }
2bff8ebf
CL		 1038
1039 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 1040 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 1041
1042 for (; j != (index - 1) % tid_agg_rx->buf_size;
1043 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 1044 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
2bff8ebf
CL		 1045 break;
1046 }
1047
1048 set_release_timer:
1049
788211d8
JB		 1050 if (!tid_agg_rx->removed)
1051 mod_timer(&tid_agg_rx->reorder_timer,
1052 tid_agg_rx->reorder_time[j] + 1 +
1053 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 1054 } else {
1055 del_timer(&tid_agg_rx->reorder_timer);
1056 }
aa0c8636
CL		 1057}
1058
1edfb1af
JB		 1059/*
1060 * As this function belongs to the RX path it must be under
1061 * rcu_read_lock protection. It returns false if the frame
1062 * can be processed immediately, true if it was consumed.
1063 */
d3b2fb53 1064static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 1065 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 1066 struct sk_buff *skb,
1067 struct sk_buff_head *frames)
1edfb1af
JB		 1068{
1069 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 1070 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 1071 u16 sc = le16_to_cpu(hdr->seq_ctrl);
1072 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
1073 u16 head_seq_num, buf_size;
1074 int index;
2bff8ebf 1075 bool ret = true;
1edfb1af 1076
dd318575
JB		 1077 spin_lock(&tid_agg_rx->reorder_lock);
1078
4549cf2b
MK		 1079 /*
1080 * Offloaded BA sessions have no known starting sequence number so pick
1081 * one from first Rxed frame for this tid after BA was started.
1082 */
1083 if (unlikely(tid_agg_rx->auto_seq)) {
1084 tid_agg_rx->auto_seq = false;
1085 tid_agg_rx->ssn = mpdu_seq_num;
1086 tid_agg_rx->head_seq_num = mpdu_seq_num;
1087 }
1088
1edfb1af
JB		 1089 buf_size = tid_agg_rx->buf_size;
1090 head_seq_num = tid_agg_rx->head_seq_num;
1091
b7540d8f
SS		 1092 /*
1093 * If the current MPDU's SN is smaller than the SSN, it shouldn't
1094 * be reordered.
1095 */
1096 if (unlikely(!tid_agg_rx->started)) {
1097 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1098 ret = false;
1099 goto out;
1100 }
1101 tid_agg_rx->started = true;
1102 }
1103
1edfb1af 1104 /* frame with out of date sequence number */
9a886586 1105 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 1106 dev_kfree_skb(skb);
2bff8ebf 1107 goto out;
1edfb1af
JB		 1108 }
1109
1110 /*
1111 * If frame the sequence number exceeds our buffering window
1112 * size release some previous frames to make room for this one.
1113 */
9a886586
JB		 1114 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
1115 head_seq_num = ieee80211_sn_inc(
1116 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 1117 /* release stored frames up to new head to stack */
d3b2fb53 1118 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 1119 head_seq_num, frames);
1edfb1af
JB		 1120 }
1121
1122 /* Now the new frame is always in the range of the reordering buffer */
1123
2e3049b7 1124 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 1125
1126 /* check if we already stored this frame */
fb4ea054 1127 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1edfb1af 1128 dev_kfree_skb(skb);
2bff8ebf 1129 goto out;
1edfb1af
JB		 1130 }
1131
1132 /*
1133 * If the current MPDU is in the right order and nothing else
1134 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 1135 * If it is first but there's something stored, we may be able
1136 * to release frames after this one.
1edfb1af
JB		 1137 */
1138 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1139 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1140 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1141 tid_agg_rx->head_seq_num =
1142 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1143 ret = false;
1144 goto out;
1edfb1af
JB		 1145 }
1146
1147 /* put the frame in the reordering buffer */
83eb935e
MK		 1148 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1149 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1150 tid_agg_rx->reorder_time[index] = jiffies;
1151 tid_agg_rx->stored_mpdu_num++;
1152 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1153 }
1edfb1af 1154
2bff8ebf
CL		 1155 out:
1156 spin_unlock(&tid_agg_rx->reorder_lock);
1157 return ret;
1edfb1af
JB		 1158}
1159
1160/*
1161 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1162 * true if the MPDU was buffered, false if it should be processed.
1163 */
f9e124fb
CL		 1164static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1165 struct sk_buff_head *frames)
1edfb1af 1166{
2569a826
JB		 1167 struct sk_buff *skb = rx->skb;
1168 struct ieee80211_local *local = rx->local;
1edfb1af 1169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1170 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1171 struct tid_ampdu_rx *tid_agg_rx;
1172 u16 sc;
6cc00d54 1173 u8 tid, ack_policy;
1edfb1af 1174
051a41fa
JB		 1175 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1176 is_multicast_ether_addr(hdr->addr1))
2569a826 1177 goto dont_reorder;
1edfb1af
JB		 1178
1179 /*
1180 * filter the QoS data rx stream according to
1181 * STA/TID and check if this STA/TID is on aggregation
1182 */
1183
1edfb1af 1184 if (!sta)
2569a826 1185 goto dont_reorder;
1edfb1af 1186
6cc00d54
TP		 1187 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1188 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1189 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1190
a87f736d 1191 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
bfe40fa3
JB		 1192 if (!tid_agg_rx) {
1193 if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1194 !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
1195 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
1196 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
1197 WLAN_BACK_RECIPIENT,
1198 WLAN_REASON_QSTA_REQUIRE_SETUP);
a87f736d 1199 goto dont_reorder;
bfe40fa3 1200 }
1edfb1af
JB		 1201
1202 /* qos null data frames are excluded */
1203 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1204 goto dont_reorder;
1edfb1af 1205
6cc00d54
TP		 1206 /* not part of a BA session */
1207 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1208 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1209 goto dont_reorder;
1210
1edfb1af
JB		 1211 /* new, potentially un-ordered, ampdu frame - process it */
1212
1213 /* reset session timer */
1214 if (tid_agg_rx->timeout)
12d3952f 1215 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1216
1217 /* if this mpdu is fragmented - terminate rx aggregation session */
1218 sc = le16_to_cpu(hdr->seq_ctrl);
1219 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1220 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1221 skb_queue_tail(&rx->sdata->skb_queue, skb);
1222 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1223 return;
1edfb1af
JB		 1224 }
1225
a87f736d
JB		 1226 /*
1227 * No locking needed -- we will only ever process one
1228 * RX packet at a time, and thus own tid_agg_rx. All
1229 * other code manipulating it needs to (and does) make
1230 * sure that we cannot get to it any more before doing
1231 * anything with it.
1232 */
f9e124fb
CL		 1233 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1234 frames))
2569a826
JB		 1235 return;
1236
1237 dont_reorder:
f9e124fb 1238 __skb_queue_tail(frames, skb);
1edfb1af 1239}
33b64eb2 1240
49461622 1241static ieee80211_rx_result debug_noinline
0395442a 1242ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1243{
a7767f95 1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1245 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1246
f9cfa5f3
SS		 1247 if (status->flag & RX_FLAG_DUP_VALIDATED)
1248 return RX_CONTINUE;
1249
6b0f3274
JB		 1250 /*
1251 * Drop duplicate 802.11 retransmissions
1252 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1253 */
0395442a
JB		 1254
1255 if (rx->skb->len < 24)
1256 return RX_CONTINUE;
1257
1258 if (ieee80211_is_ctl(hdr->frame_control) ||
1259 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1260 is_multicast_ether_addr(hdr->addr1))
1261 return RX_CONTINUE;
1262
a732fa70
JB		 1263 if (!rx->sta)
1264 return RX_CONTINUE;
1265
1266 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1267 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1268 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1269 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1270 return RX_DROP_UNUSABLE;
1271 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1272 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1273 }
1274
0395442a
JB		 1275 return RX_CONTINUE;
1276}
1277
1278static ieee80211_rx_result debug_noinline
1279ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1280{
1281 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1282
571ecf67
JB		 1283 /* Drop disallowed frame classes based on STA auth/assoc state;
1284 * IEEE 802.11, Chap 5.5.
1285 *
ccd7b362
JB		 1286 * mac80211 filters only based on association state, i.e. it drops
1287 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1288 * deauth/disassoc frames when needed. In addition, hostapd is
1289 * responsible for filtering on both auth and assoc states.
1290 */
33b64eb2 1291
902acc78 1292 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1293 return ieee80211_rx_mesh_check(rx);
33b64eb2 1294
a7767f95
HH		 1295 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1296 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1297 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1298 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1299 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1300 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1301 /*
1302 * accept port control frames from the AP even when it's not
1303 * yet marked ASSOC to prevent a race where we don't set the
1304 * assoc bit quickly enough before it sends the first frame
1305 */
1306 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1307 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1308 unsigned int hdrlen;
1309 __be16 ethertype;
1310
1311 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1312
1313 if (rx->skb->len < hdrlen + 8)
1314 return RX_DROP_MONITOR;
1315
1316 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1317 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1318 return RX_CONTINUE;
1319 }
21fc7560
JB		 1320
1321 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1322 cfg80211_rx_spurious_frame(rx->sdata->dev,
1323 hdr->addr2,
1324 GFP_ATOMIC))
1325 return RX_DROP_UNUSABLE;
1326
e4c26add 1327 return RX_DROP_MONITOR;
2a33bee2 1328 }
571ecf67 1329
9ae54c84 1330 return RX_CONTINUE;
570bd537
JB		 1331}
1332
1333
572e0012
KV		 1334static ieee80211_rx_result debug_noinline
1335ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1336{
1337 struct ieee80211_local *local;
1338 struct ieee80211_hdr *hdr;
1339 struct sk_buff *skb;
1340
1341 local = rx->local;
1342 skb = rx->skb;
1343 hdr = (struct ieee80211_hdr *) skb->data;
1344
1345 if (!local->pspolling)
1346 return RX_CONTINUE;
1347
1348 if (!ieee80211_has_fromds(hdr->frame_control))
1349 /* this is not from AP */
1350 return RX_CONTINUE;
1351
1352 if (!ieee80211_is_data(hdr->frame_control))
1353 return RX_CONTINUE;
1354
1355 if (!ieee80211_has_moredata(hdr->frame_control)) {
1356 /* AP has no more frames buffered for us */
1357 local->pspolling = false;
1358 return RX_CONTINUE;
1359 }
1360
1361 /* more data bit is set, let's request a new frame from the AP */
1362 ieee80211_send_pspoll(local, rx->sdata);
1363
1364 return RX_CONTINUE;
1365}
1366
d012a605 1367static void sta_ps_start(struct sta_info *sta)
571ecf67 1368{
133b8226 1369 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1370 struct ieee80211_local *local = sdata->local;
d012a605 1371 struct ps_data *ps;
ba8c3d6f 1372 int tid;
0795af57 1373
d012a605
MP		 1374 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1375 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1376 ps = &sdata->bss->ps;
1377 else
1378 return;
1379
1380 atomic_inc(&ps->num_sta_ps);
c2c98fde 1381 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1382 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1383 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1384 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1385 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1386
17c18bf8
JB		 1387 ieee80211_clear_fast_xmit(sta);
1388
ba8c3d6f
FF		 1389 if (!sta->sta.txq[0])
1390 return;
1391
1392 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
bb42f2d1 1393 if (txq_has_queue(sta->sta.txq[tid]))
ba8c3d6f
FF		 1394 set_bit(tid, &sta->txq_buffered_tids);
1395 else
1396 clear_bit(tid, &sta->txq_buffered_tids);
1397 }
571ecf67
JB		 1398}
1399
d012a605 1400static void sta_ps_end(struct sta_info *sta)
571ecf67 1401{
bdcbd8e0
JB		 1402 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1403 sta->sta.addr, sta->sta.aid);
004c872e 1404
c2c98fde 1405 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1406 /*
1407 * Clear the flag only if the other one is still set
1408 * so that the TX path won't start TX'ing new frames
1409 * directly ... In the case that the driver flag isn't
1410 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1411 */
1412 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1413 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1414 sta->sta.addr, sta->sta.aid);
af818581
JB		 1415 return;
1416 }
1417
5ac2e350
JB		 1418 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1419 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1420 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1421}
1422
cf47161a 1423int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1424{
cf47161a 1425 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1426 bool in_ps;
1427
cf47161a 1428 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1429
1430 /* Don't let the same PS state be set twice */
cf47161a 1431 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1432 if ((start && in_ps) || (!start && !in_ps))
1433 return -EINVAL;
1434
1435 if (start)
cf47161a 1436 sta_ps_start(sta);
d057e5a3 1437 else
cf47161a 1438 sta_ps_end(sta);
d057e5a3
AN		 1439
1440 return 0;
1441}
1442EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1443
46fa38e8
JB		 1444void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1445{
1446 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1447
1448 if (test_sta_flag(sta, WLAN_STA_SP))
1449 return;
1450
1451 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1452 ieee80211_sta_ps_deliver_poll_response(sta);
1453 else
1454 set_sta_flag(sta, WLAN_STA_PSPOLL);
1455}
1456EXPORT_SYMBOL(ieee80211_sta_pspoll);
1457
1458void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1459{
1460 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
731977e9 1461 int ac = ieee80211_ac_from_tid(tid);
46fa38e8
JB		 1462
1463 /*
0aa419ec
EG		 1464 * If this AC is not trigger-enabled do nothing unless the
1465 * driver is calling us after it already checked.
46fa38e8
JB		 1466 *
1467 * NB: This could/should check a separate bitmap of trigger-
1468 * enabled queues, but for now we only implement uAPSD w/o
1469 * TSPEC changes to the ACs, so they're always the same.
1470 */
f438ceb8
EG		 1471 if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) &&
1472 tid != IEEE80211_NUM_TIDS)
46fa38e8
JB		 1473 return;
1474
1475 /* if we are in a service period, do nothing */
1476 if (test_sta_flag(sta, WLAN_STA_SP))
1477 return;
1478
1479 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1480 ieee80211_sta_ps_deliver_uapsd(sta);
1481 else
1482 set_sta_flag(sta, WLAN_STA_UAPSD);
1483}
1484EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1485
47086fc5
JB		 1486static ieee80211_rx_result debug_noinline
1487ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1488{
1489 struct ieee80211_sub_if_data *sdata = rx->sdata;
1490 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1491 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
47086fc5 1492
5c90067c 1493 if (!rx->sta)
47086fc5
JB		 1494 return RX_CONTINUE;
1495
1496 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1497 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1498 return RX_CONTINUE;
1499
1500 /*
1501 * The device handles station powersave, so don't do anything about
1502 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1503 * it to mac80211 since they're handled.)
1504 */
30686bf7 1505 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1506 return RX_CONTINUE;
1507
1508 /*
1509 * Don't do anything if the station isn't already asleep. In
1510 * the uAPSD case, the station will probably be marked asleep,
1511 * in the PS-Poll case the station must be confused ...
1512 */
c2c98fde 1513 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1514 return RX_CONTINUE;
1515
1516 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
46fa38e8 1517 ieee80211_sta_pspoll(&rx->sta->sta);
47086fc5
JB		 1518
1519 /* Free PS Poll skb here instead of returning RX_DROP that would
1520 * count as an dropped frame. */
1521 dev_kfree_skb(rx->skb);
1522
1523 return RX_QUEUED;
1524 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1525 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1526 ieee80211_has_pm(hdr->frame_control) &&
1527 (ieee80211_is_data_qos(hdr->frame_control) ||
1528 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
46fa38e8 1529 u8 tid;
47086fc5 1530
46fa38e8 1531 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
47086fc5 1532
46fa38e8 1533 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
47086fc5
JB		 1534 }
1535
1536 return RX_CONTINUE;
1537}
1538
49461622 1539static ieee80211_rx_result debug_noinline
5cf121c3 1540ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1541{
1542 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1543 struct sk_buff *skb = rx->skb;
1544 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1545 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1546 int i;
571ecf67
JB		 1547
1548 if (!sta)
9ae54c84 1549 return RX_CONTINUE;
571ecf67 1550
b291ba11
JB		 1551 /*
1552 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1553 * BSSID and for station already AUTHORIZED to avoid keeping the
1554 * current IBSS network alive in cases where other STAs start
1555 * using different BSSID. This will also give the station another
1556 * chance to restart the authentication/authorization in case
1557 * something went wrong the first time.
b291ba11 1558 */
05c914fe 1559 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1560 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1561 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1562 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1563 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1564 sta->rx_stats.last_rx = jiffies;
f4ebddf9 1565 if (ieee80211_is_data(hdr->frame_control) &&
4f6b1b3d
JB		 1566 !is_multicast_ether_addr(hdr->addr1))
1567 sta->rx_stats.last_rate =
1568 sta_stats_encode_rate(status);
3af6334c 1569 }
239281f8 1570 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1571 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1572 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1573 /*
33b64eb2
LCC		 1574 * Mesh beacons will update last_rx when if they are found to
1575 * match the current local configuration when processed.
571ecf67 1576 */
e5a9f8d0 1577 sta->rx_stats.last_rx = jiffies;
4f6b1b3d
JB		 1578 if (ieee80211_is_data(hdr->frame_control))
1579 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
571ecf67
JB		 1580 }
1581
3cf335d5
KV		 1582 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1583 ieee80211_sta_rx_notify(rx->sdata, hdr);
1584
e5a9f8d0 1585 sta->rx_stats.fragments++;
0f9c5a61
JB		 1586
1587 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
e5a9f8d0 1588 sta->rx_stats.bytes += rx->skb->len;
0f9c5a61
JB		 1589 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1590
fe8431f8 1591 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0 1592 sta->rx_stats.last_signal = status->signal;
0be6ed13 1593 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
fe8431f8 1594 }
571ecf67 1595
ef0621e8 1596 if (status->chains) {
e5a9f8d0 1597 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1598 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1599 int signal = status->chain_signal[i];
1600
1601 if (!(status->chains & BIT(i)))
1602 continue;
1603
e5a9f8d0 1604 sta->rx_stats.chain_signal_last[i] = signal;
0be6ed13 1605 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
e5a9f8d0 1606 -signal);
ef0621e8
FF		 1607 }
1608 }
1609
72eaa43a
JB		 1610 /*
1611 * Change STA power saving mode only at the end of a frame
1612 * exchange sequence.
1613 */
30686bf7 1614 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1615 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1616 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1617 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1618 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1619 /* PM bit is only checked in frames where it isn't reserved,
1620 * in AP mode it's reserved in non-bufferable management frames
1621 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1622 */
1623 (!ieee80211_is_mgmt(hdr->frame_control) ||
1624 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1625 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1626 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1627 sta_ps_end(sta);
72eaa43a
JB		 1628 } else {
1629 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1630 sta_ps_start(sta);
72eaa43a 1631 }
571ecf67
JB		 1632 }
1633
3f52b7e3
MP		 1634 /* mesh power save support */
1635 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1636 ieee80211_mps_rx_h_sta_process(sta, hdr);
1637
22403def
JB		 1638 /*
1639 * Drop (qos-)data::nullfunc frames silently, since they
1640 * are used only to control station power saving mode.
1641 */
1642 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1643 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1644 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1645
1646 /*
1647 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1648 * that was not moved to a 4-addr STA vlan yet send
1649 * the event to userspace and for older hostapd drop
1650 * the frame to the monitor interface.
d524215f
FF		 1651 */
1652 if (ieee80211_has_a4(hdr->frame_control) &&
1653 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1654 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1655 !rx->sdata->u.vlan.sta))) {
1656 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1657 cfg80211_rx_unexpected_4addr_frame(
1658 rx->sdata->dev, sta->sta.addr,
1659 GFP_ATOMIC);
d524215f 1660 return RX_DROP_MONITOR;
e7f4a940 1661 }
22403def
JB		 1662 /*
1663 * Update counter and free packet here to avoid
1664 * counting this as a dropped packed.
1665 */
e5a9f8d0 1666 sta->rx_stats.packets++;
571ecf67 1667 dev_kfree_skb(rx->skb);
9ae54c84 1668 return RX_QUEUED;
571ecf67
JB		 1669 }
1670
9ae54c84 1671 return RX_CONTINUE;
571ecf67
JB		 1672} /* ieee80211_rx_h_sta_process */
1673
86c228a7
JA		 1674static ieee80211_rx_result debug_noinline
1675ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1676{
1677 struct sk_buff *skb = rx->skb;
1678 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1680 int keyidx;
1681 int hdrlen;
1682 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1683 struct ieee80211_key *sta_ptk = NULL;
1684 int mmie_keyidx = -1;
1685 __le16 fc;
2475b1cc 1686 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1687
1688 /*
1689 * Key selection 101
1690 *
1691 * There are four types of keys:
1692 * - GTK (group keys)
1693 * - IGTK (group keys for management frames)
1694 * - PTK (pairwise keys)
1695 * - STK (station-to-station pairwise keys)
1696 *
1697 * When selecting a key, we have to distinguish between multicast
1698 * (including broadcast) and unicast frames, the latter can only
1699 * use PTKs and STKs while the former always use GTKs and IGTKs.
1700 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1701 * unicast frames can also use key indices like GTKs. Hence, if we
1702 * don't have a PTK/STK we check the key index for a WEP key.
1703 *
1704 * Note that in a regular BSS, multicast frames are sent by the
1705 * AP only, associated stations unicast the frame to the AP first
1706 * which then multicasts it on their behalf.
1707 *
1708 * There is also a slight problem in IBSS mode: GTKs are negotiated
1709 * with each station, that is something we don't currently handle.
1710 * The spec seems to expect that one negotiates the same key with
1711 * every station but there's no such requirement; VLANs could be
1712 * possible.
1713 */
1714
86c228a7
JA		 1715 /* start without a key */
1716 rx->key = NULL;
2475b1cc 1717 fc = hdr->frame_control;
86c228a7 1718
2475b1cc
MS		 1719 if (rx->sta) {
1720 int keyid = rx->sta->ptk_idx;
86c228a7 1721
2475b1cc
MS		 1722 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1723 cs = rx->sta->cipher_scheme;
2c61cf9c 1724 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
2475b1cc
MS		 1725 if (unlikely(keyid < 0))
1726 return RX_DROP_UNUSABLE;
1727 }
1728 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1729 }
86c228a7
JA		 1730
1731 if (!ieee80211_has_protected(fc))
1732 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1733
1734 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1735 rx->key = sta_ptk;
1736 if ((status->flag & RX_FLAG_DECRYPTED) &&
1737 (status->flag & RX_FLAG_IV_STRIPPED))
1738 return RX_CONTINUE;
1739 /* Skip decryption if the frame is not protected. */
1740 if (!ieee80211_has_protected(fc))
1741 return RX_CONTINUE;
1742 } else if (mmie_keyidx >= 0) {
1743 /* Broadcast/multicast robust management frame / BIP */
1744 if ((status->flag & RX_FLAG_DECRYPTED) &&
1745 (status->flag & RX_FLAG_IV_STRIPPED))
1746 return RX_CONTINUE;
1747
1748 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1749 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1750 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
46f6b060
MH		 1751 if (rx->sta) {
1752 if (ieee80211_is_group_privacy_action(skb) &&
1753 test_sta_flag(rx->sta, WLAN_STA_MFP))
1754 return RX_DROP_MONITOR;
1755
86c228a7 1756 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
46f6b060 1757 }
86c228a7
JA		 1758 if (!rx->key)
1759 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1760 } else if (!ieee80211_has_protected(fc)) {
1761 /*
1762 * The frame was not protected, so skip decryption. However, we
1763 * need to set rx->key if there is a key that could have been
1764 * used so that the frame may be dropped if encryption would
1765 * have been expected.
1766 */
1767 struct ieee80211_key *key = NULL;
1768 struct ieee80211_sub_if_data *sdata = rx->sdata;
1769 int i;
1770
1771 if (ieee80211_is_mgmt(fc) &&
1772 is_multicast_ether_addr(hdr->addr1) &&
1773 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1774 rx->key = key;
1775 else {
1776 if (rx->sta) {
1777 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1778 key = rcu_dereference(rx->sta->gtk[i]);
1779 if (key)
1780 break;
1781 }
1782 }
1783 if (!key) {
1784 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1785 key = rcu_dereference(sdata->keys[i]);
1786 if (key)
1787 break;
1788 }
1789 }
1790 if (key)
1791 rx->key = key;
1792 }
1793 return RX_CONTINUE;
1794 } else {
1795 u8 keyid;
2475b1cc 1796
86c228a7
JA		 1797 /*
1798 * The device doesn't give us the IV so we won't be
1799 * able to look up the key. That's ok though, we
1800 * don't need to decrypt the frame, we just won't
1801 * be able to keep statistics accurate.
1802 * Except for key threshold notifications, should
1803 * we somehow allow the driver to tell us which key
1804 * the hardware used if this flag is set?
1805 */
1806 if ((status->flag & RX_FLAG_DECRYPTED) &&
1807 (status->flag & RX_FLAG_IV_STRIPPED))
1808 return RX_CONTINUE;
1809
1810 hdrlen = ieee80211_hdrlen(fc);
1811
2475b1cc 1812 if (cs) {
2c61cf9c 1813 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
86c228a7 1814
2475b1cc
MS		 1815 if (unlikely(keyidx < 0))
1816 return RX_DROP_UNUSABLE;
1817 } else {
1818 if (rx->skb->len < 8 + hdrlen)
1819 return RX_DROP_UNUSABLE; /* TODO: count this? */
1820 /*
1821 * no need to call ieee80211_wep_get_keyidx,
1822 * it verifies a bunch of things we've done already
1823 */
1824 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1825 keyidx = keyid >> 6;
1826 }
86c228a7
JA		 1827
1828 /* check per-station GTK first, if multicast packet */
1829 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1830 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1831
1832 /* if not found, try default key */
1833 if (!rx->key) {
1834 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1835
1836 /*
1837 * RSNA-protected unicast frames should always be
1838 * sent with pairwise or station-to-station keys,
1839 * but for WEP we allow using a key index as well.
1840 */
1841 if (rx->key &&
1842 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1843 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1844 !is_multicast_ether_addr(hdr->addr1))
1845 rx->key = NULL;
1846 }
1847 }
1848
1849 if (rx->key) {
1850 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1851 return RX_DROP_MONITOR;
1852
86c228a7
JA		 1853 /* TODO: add threshold stuff again */
1854 } else {
1855 return RX_DROP_MONITOR;
1856 }
1857
1858 switch (rx->key->conf.cipher) {
1859 case WLAN_CIPHER_SUITE_WEP40:
1860 case WLAN_CIPHER_SUITE_WEP104:
1861 result = ieee80211_crypto_wep_decrypt(rx);
1862 break;
1863 case WLAN_CIPHER_SUITE_TKIP:
1864 result = ieee80211_crypto_tkip_decrypt(rx);
1865 break;
1866 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1867 result = ieee80211_crypto_ccmp_decrypt(
1868 rx, IEEE80211_CCMP_MIC_LEN);
1869 break;
1870 case WLAN_CIPHER_SUITE_CCMP_256:
1871 result = ieee80211_crypto_ccmp_decrypt(
1872 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1873 break;
1874 case WLAN_CIPHER_SUITE_AES_CMAC:
1875 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1876 break;
56c52da2
JM		 1877 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1878 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1879 break;
8ade538b
JM		 1880 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1881 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1882 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1883 break;
00b9cfa3
JM		 1884 case WLAN_CIPHER_SUITE_GCMP:
1885 case WLAN_CIPHER_SUITE_GCMP_256:
1886 result = ieee80211_crypto_gcmp_decrypt(rx);
1887 break;
86c228a7 1888 default:
2475b1cc 1889 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1890 }
1891
1892 /* the hdr variable is invalid after the decrypt handlers */
1893
1894 /* either the frame has been decrypted or will be dropped */
1895 status->flag |= RX_FLAG_DECRYPTED;
1896
1897 return result;
1898}
1899
571ecf67
JB		 1900static inline struct ieee80211_fragment_entry *
1901ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1902 unsigned int frag, unsigned int seq, int rx_queue,
1903 struct sk_buff **skb)
1904{
1905 struct ieee80211_fragment_entry *entry;
571ecf67 1906
571ecf67
JB		 1907 entry = &sdata->fragments[sdata->fragment_next++];
1908 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1909 sdata->fragment_next = 0;
1910
bdcbd8e0 1911 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1912 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1913
1914 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1915 *skb = NULL;
1916 entry->first_frag_time = jiffies;
1917 entry->seq = seq;
1918 entry->rx_queue = rx_queue;
1919 entry->last_frag = frag;
9acc54be 1920 entry->check_sequential_pn = false;
571ecf67
JB		 1921 entry->extra_len = 0;
1922
1923 return entry;
1924}
1925
1926static inline struct ieee80211_fragment_entry *
1927ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1928 unsigned int frag, unsigned int seq,
571ecf67
JB		 1929 int rx_queue, struct ieee80211_hdr *hdr)
1930{
1931 struct ieee80211_fragment_entry *entry;
1932 int i, idx;
1933
1934 idx = sdata->fragment_next;
1935 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1936 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1937
1938 idx--;
1939 if (idx < 0)
1940 idx = IEEE80211_FRAGMENT_MAX - 1;
1941
1942 entry = &sdata->fragments[idx];
1943 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1944 entry->rx_queue != rx_queue ||
1945 entry->last_frag + 1 != frag)
1946 continue;
1947
b73d70ad 1948 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1949
b73d70ad
HH		 1950 /*
1951 * Check ftype and addresses are equal, else check next fragment
1952 */
1953 if (((hdr->frame_control ^ f_hdr->frame_control) &
1954 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1955 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1956 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1957 continue;
1958
ab46623e 1959 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1960 __skb_queue_purge(&entry->skb_list);
1961 continue;
1962 }
1963 return entry;
1964 }
1965
1966 return NULL;
1967}
1968
49461622 1969static ieee80211_rx_result debug_noinline
5cf121c3 1970ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1971{
1972 struct ieee80211_hdr *hdr;
1973 u16 sc;
358c8d9d 1974 __le16 fc;
571ecf67
JB		 1975 unsigned int frag, seq;
1976 struct ieee80211_fragment_entry *entry;
1977 struct sk_buff *skb;
1978
b73d70ad 1979 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1980 fc = hdr->frame_control;
f7fbf70e
JC		 1981
1982 if (ieee80211_is_ctl(fc))
1983 return RX_CONTINUE;
1984
571ecf67
JB		 1985 sc = le16_to_cpu(hdr->seq_ctrl);
1986 frag = sc & IEEE80211_SCTL_FRAG;
1987
b8fff407 1988 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 1989 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 1990 goto out_no_led;
571ecf67 1991 }
b8fff407 1992
d025933e
AM		 1993 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1994 goto out;
1995
571ecf67
JB		 1996 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1997
e3cf8b3f
ZY		 1998 if (skb_linearize(rx->skb))
1999 return RX_DROP_UNUSABLE;
2000
058897a4
AK		 2001 /*
2002 * skb_linearize() might change the skb->data and
2003 * previously cached variables (in this case, hdr) need to
2004 * be refreshed with the new data.
2005 */
2006 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 2007 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
2008
2009 if (frag == 0) {
2010 /* This is the first fragment of a new frame. */
2011 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 2012 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 2013 if (rx->key &&
2014 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
9acc54be
JB		 2015 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
2016 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
2017 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
358c8d9d 2018 ieee80211_has_protected(fc)) {
9e26297a 2019 int queue = rx->security_idx;
9acc54be
JB		 2020
2021 /* Store CCMP/GCMP PN so that we can verify that the
2022 * next fragment has a sequential PN value.
2023 */
2024 entry->check_sequential_pn = true;
571ecf67 2025 memcpy(entry->last_pn,
9190252c 2026 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 2027 IEEE80211_CCMP_PN_LEN);
9acc54be
JB		 2028 BUILD_BUG_ON(offsetof(struct ieee80211_key,
2029 u.ccmp.rx_pn) !=
2030 offsetof(struct ieee80211_key,
2031 u.gcmp.rx_pn));
2032 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
2033 sizeof(rx->key->u.gcmp.rx_pn[queue]));
2034 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
2035 IEEE80211_GCMP_PN_LEN);
571ecf67 2036 }
9ae54c84 2037 return RX_QUEUED;
571ecf67
JB		 2038 }
2039
2040 /* This is a fragment for a frame that should already be pending in
2041 * fragment cache. Add this fragment to the end of the pending entry.
2042 */
9e26297a
JB		 2043 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
2044 rx->seqno_idx, hdr);
571ecf67
JB		 2045 if (!entry) {
2046 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 2047 return RX_DROP_MONITOR;
571ecf67
JB		 2048 }
2049
9acc54be
JB		 2050 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
2051 * MPDU PN values are not incrementing in steps of 1."
2052 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
2053 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
2054 */
2055 if (entry->check_sequential_pn) {
571ecf67 2056 int i;
4325f6ca 2057 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 2058 int queue;
9acc54be 2059
2b2ba0db
JM		 2060 if (!rx->key ||
2061 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
9acc54be
JB		 2062 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
2063 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
2064 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
e4c26add 2065 return RX_DROP_UNUSABLE;
4325f6ca
JB		 2066 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
2067 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 2068 pn[i]++;
2069 if (pn[i])
2070 break;
2071 }
9e26297a 2072 queue = rx->security_idx;
9190252c 2073 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 2074 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 2075 return RX_DROP_UNUSABLE;
4325f6ca 2076 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 2077 }
2078
358c8d9d 2079 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 2080 __skb_queue_tail(&entry->skb_list, rx->skb);
2081 entry->last_frag = frag;
2082 entry->extra_len += rx->skb->len;
358c8d9d 2083 if (ieee80211_has_morefrags(fc)) {
571ecf67 2084 rx->skb = NULL;
9ae54c84 2085 return RX_QUEUED;
571ecf67
JB		 2086 }
2087
2088 rx->skb = __skb_dequeue(&entry->skb_list);
2089 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 2090 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 2091 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
2092 GFP_ATOMIC))) {
2093 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
2094 __skb_queue_purge(&entry->skb_list);
e4c26add 2095 return RX_DROP_UNUSABLE;
571ecf67
JB		 2096 }
2097 }
2098 while ((skb = __skb_dequeue(&entry->skb_list))) {
2099 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
2100 dev_kfree_skb(skb);
2101 }
2102
571ecf67 2103 out:
d025933e
AM		 2104 ieee80211_led_rx(rx->local);
2105 out_no_led:
571ecf67 2106 if (rx->sta)
e5a9f8d0 2107 rx->sta->rx_stats.packets++;
9ae54c84 2108 return RX_CONTINUE;
571ecf67
JB		 2109}
2110
1df332e8 2111static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 2112{
1df332e8 2113 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 2114 return -EACCES;
571ecf67 2115
76ee65bf 2116 return 0;
571ecf67
JB		 2117}
2118
1df332e8 2119static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 2120{
eb9fb5b8
JB		 2121 struct sk_buff *skb = rx->skb;
2122 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2123
3017b80b 2124 /*
7848ba7d
JB		 2125 * Pass through unencrypted frames if the hardware has
2126 * decrypted them already.
3017b80b 2127 */
eb9fb5b8 2128 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 2129 return 0;
571ecf67
JB		 2130
2131 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 2132 if (unlikely(!ieee80211_has_protected(fc) &&
2133 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 2134 ieee80211_is_data(fc) && rx->key))
76ee65bf 2135 return -EACCES;
bef5d1c7
JB		 2136
2137 return 0;
2138}
2139
1df332e8 2140static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 2141{
2142 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 2143 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 2144 __le16 fc = hdr->frame_control;
bef5d1c7 2145
e3efca0a
JM		 2146 /*
2147 * Pass through unencrypted frames if the hardware has
2148 * decrypted them already.
2149 */
2150 if (status->flag & RX_FLAG_DECRYPTED)
2151 return 0;
bef5d1c7 2152
c2c98fde 2153 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 2154 if (unlikely(!ieee80211_has_protected(fc) &&
2155 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2156 rx->key)) {
6ff57cf8
JB		 2157 if (ieee80211_is_deauth(fc) ||
2158 ieee80211_is_disassoc(fc))
2159 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2160 rx->skb->data,
2161 rx->skb->len);
f2ca3ea4 2162 return -EACCES;
cf4e594e 2163 }
f2ca3ea4 2164 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2165 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2166 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2167 if (ieee80211_is_deauth(fc) ||
2168 ieee80211_is_disassoc(fc))
2169 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2170 rx->skb->data,
2171 rx->skb->len);
f2ca3ea4 2172 return -EACCES;
cf4e594e 2173 }
f2ca3ea4
JM		 2174 /*
2175 * When using MFP, Action frames are not allowed prior to
2176 * having configured keys.
2177 */
2178 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2179 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2180 return -EACCES;
2181 }
b3fc9c6c 2182
76ee65bf 2183 return 0;
571ecf67
JB		 2184}
2185
76ee65bf 2186static int
4114fa21 2187__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2188{
eb9fb5b8 2189 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2190 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2191 bool check_port_control = false;
2192 struct ethhdr *ehdr;
2193 int ret;
f14543ee 2194
4114fa21 2195 *port_control = false;
9bc383de
JB		 2196 if (ieee80211_has_a4(hdr->frame_control) &&
2197 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2198 return -1;
9bc383de 2199
fbb327c5
FF		 2200 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2201 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2202
2203 if (!sdata->u.mgd.use_4addr)
2204 return -1;
2205 else
2206 check_port_control = true;
2207 }
2208
9bc383de 2209 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2210 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2211 return -1;
571ecf67 2212
fbb327c5 2213 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2214 if (ret < 0)
fbb327c5
FF		 2215 return ret;
2216
2217 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2218 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2219 *port_control = true;
2220 else if (check_port_control)
fbb327c5
FF		 2221 return -1;
2222
2223 return 0;
76ee65bf 2224}
571ecf67 2225
ce3edf6d
JB		 2226/*
2227 * requires that rx->skb is a frame with ethernet header
2228 */
358c8d9d 2229static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2230{
c97c23e3 2231 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2232 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2233 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2234
2235 /*
2236 * Allow EAPOL frames to us/the PAE group address regardless
2237 * of whether the frame was encrypted or not.
2238 */
a621fa4d 2239 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2240 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2241 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2242 return true;
2243
2244 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2245 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2246 return false;
2247
2248 return true;
2249}
2250
2251/*
2252 * requires that rx->skb is a frame with ethernet header
2253 */
76ee65bf 2254static void
5cf121c3 2255ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2256{
eb9fb5b8
JB		 2257 struct ieee80211_sub_if_data *sdata = rx->sdata;
2258 struct net_device *dev = sdata->dev;
76ee65bf 2259 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2260 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2261 struct sta_info *dsta;
571ecf67 2262
76ee65bf
RR		 2263 skb = rx->skb;
2264 xmit_skb = NULL;
571ecf67 2265
5a490510
JB		 2266 ieee80211_rx_stats(dev, skb->len);
2267
de8f18d3
JB		 2268 if (rx->sta) {
2269 /* The seqno index has the same property as needed
2270 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2271 * for non-QoS-data frames. Here we know it's a data
2272 * frame, so count MSDUs.
2273 */
0f9c5a61 2274 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
de8f18d3 2275 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
0f9c5a61 2276 u64_stats_update_end(&rx->sta->rx_stats.syncp);
de8f18d3
JB		 2277 }
2278
05c914fe
JB		 2279 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2280 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2281 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2282 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
72f15d53
MB		 2283 if (is_multicast_ether_addr(ehdr->h_dest) &&
2284 ieee80211_vif_get_num_mcast_if(sdata) != 0) {
ce3edf6d
JB		 2285 /*
2286 * send multicast frames both to higher layers in
2287 * local net stack and back to the wireless medium
2288 */
76ee65bf 2289 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2290 if (!xmit_skb)
bdcbd8e0 2291 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2292 dev->name);
72f15d53 2293 } else if (!is_multicast_ether_addr(ehdr->h_dest)) {
abe60632
JB		 2294 dsta = sta_info_get(sdata, skb->data);
2295 if (dsta) {
ce3edf6d
JB		 2296 /*
2297 * The destination station is associated to
2298 * this AP (in this VLAN), so send the frame
2299 * directly to it and do not pass it to local
2300 * net stack.
571ecf67 2301 */
76ee65bf 2302 xmit_skb = skb;
571ecf67
JB		 2303 skb = NULL;
2304 }
571ecf67
JB		 2305 }
2306 }
2307
59d9cb07 2308#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2309 if (skb) {
2310 /* 'align' will only take the values 0 or 2 here since all
2311 * frames are required to be aligned to 2-byte boundaries
2312 * when being passed to mac80211; the code here works just
2313 * as well if that isn't true, but mac80211 assumes it can
2314 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2315 */
9e890a1f
JB		 2316 int align;
2317
2318 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2319 if (align) {
2320 if (WARN_ON(skb_headroom(skb) < 3)) {
2321 dev_kfree_skb(skb);
2322 skb = NULL;
2323 } else {
2324 u8 *data = skb->data;
8ce0b589
ZY		 2325 size_t len = skb_headlen(skb);
2326 skb->data -= align;
2327 memmove(skb->data, data, len);
2328 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2329 }
2330 }
9e890a1f 2331 }
d1c3a37c
JB		 2332#endif
2333
9e890a1f
JB		 2334 if (skb) {
2335 /* deliver to local stack */
2336 skb->protocol = eth_type_trans(skb, dev);
2337 memset(skb->cb, 0, sizeof(skb->cb));
af9f9b22
JB		 2338 if (rx->napi)
2339 napi_gro_receive(rx->napi, skb);
06d181a8
JB		 2340 else
2341 netif_receive_skb(skb);
571ecf67
JB		 2342 }
2343
76ee65bf 2344 if (xmit_skb) {
aef6c928
HS		 2345 /*
2346 * Send to wireless media and increase priority by 256 to
2347 * keep the received priority instead of reclassifying
2348 * the frame (see cfg80211_classify8021d).
2349 */
2350 xmit_skb->priority += 256;
f831e909 2351 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2352 skb_reset_network_header(xmit_skb);
2353 skb_reset_mac_header(xmit_skb);
76ee65bf 2354 dev_queue_xmit(xmit_skb);
571ecf67 2355 }
76ee65bf
RR		 2356}
2357
49461622 2358static ieee80211_rx_result debug_noinline
5cf121c3 2359ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2360{
eb9fb5b8 2361 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2362 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2364 __le16 fc = hdr->frame_control;
eaf85ca7 2365 struct sk_buff_head frame_list;
554891e6 2366 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
7f6990c8 2367 struct ethhdr ethhdr;
e2b5227f 2368 const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
fd4c7f2f 2369
358c8d9d 2370 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2371 return RX_CONTINUE;
fd4c7f2f 2372
358c8d9d 2373 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2374 return RX_DROP_MONITOR;
fd4c7f2f 2375
554891e6 2376 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2377 return RX_CONTINUE;
fd4c7f2f 2378
ea720935
JB		 2379 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
2380 switch (rx->sdata->vif.type) {
2381 case NL80211_IFTYPE_AP_VLAN:
2382 if (!rx->sdata->u.vlan.sta)
2383 return RX_DROP_UNUSABLE;
2384 break;
2385 case NL80211_IFTYPE_STATION:
2386 if (!rx->sdata->u.mgd.use_4addr)
2387 return RX_DROP_UNUSABLE;
2388 break;
2389 default:
2390 return RX_DROP_UNUSABLE;
2391 }
e2b5227f
JB		 2392 check_da = NULL;
2393 check_sa = NULL;
2394 } else switch (rx->sdata->vif.type) {
2395 case NL80211_IFTYPE_AP:
2396 case NL80211_IFTYPE_AP_VLAN:
2397 check_da = NULL;
2398 break;
2399 case NL80211_IFTYPE_STATION:
2400 if (!rx->sta ||
2401 !test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER))
2402 check_sa = NULL;
2403 break;
2404 case NL80211_IFTYPE_MESH_POINT:
2405 check_sa = NULL;
2406 break;
2407 default:
2408 break;
ea720935 2409 }
fd4c7f2f 2410
ea720935 2411 if (is_multicast_ether_addr(hdr->addr1))
e4c26add 2412 return RX_DROP_UNUSABLE;
fd4c7f2f 2413
eaf85ca7
ZY		 2414 skb->dev = dev;
2415 __skb_queue_head_init(&frame_list);
fd4c7f2f 2416
7f6990c8
JB		 2417 if (ieee80211_data_to_8023_exthdr(skb, &ethhdr,
2418 rx->sdata->vif.addr,
2419 rx->sdata->vif.type))
2420 return RX_DROP_UNUSABLE;
2421
eaf85ca7
ZY		 2422 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2423 rx->sdata->vif.type,
8b935ee2 2424 rx->local->hw.extra_tx_headroom,
e2b5227f 2425 check_da, check_sa);
fd4c7f2f 2426
eaf85ca7
ZY		 2427 while (!skb_queue_empty(&frame_list)) {
2428 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2429
358c8d9d 2430 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2431 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2432 continue;
2433 }
fd4c7f2f
RR		 2434
2435 ieee80211_deliver_skb(rx);
2436 }
2437
9ae54c84 2438 return RX_QUEUED;
fd4c7f2f
RR		 2439}
2440
bf94e17b 2441#ifdef CONFIG_MAC80211_MESH
b0dee578 2442static ieee80211_rx_result
e32f85f7
LCC		 2443ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2444{
30789eb6
TP		 2445 struct ieee80211_hdr *fwd_hdr, *hdr;
2446 struct ieee80211_tx_info *info;
e32f85f7 2447 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2448 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2449 struct ieee80211_local *local = rx->local;
eb9fb5b8 2450 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2451 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
cf440128 2452 u16 ac, q, hdrlen;
e32f85f7
LCC		 2453
2454 hdr = (struct ieee80211_hdr *) skb->data;
2455 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2456
2457 /* make sure fixed part of mesh header is there, also checks skb len */
2458 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2459 return RX_DROP_MONITOR;
2460
2461 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2462
2463 /* make sure full mesh header is there, also checks skb len */
2464 if (!pskb_may_pull(rx->skb,
2465 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2466 return RX_DROP_MONITOR;
2467
2468 /* reload pointers */
2469 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2470 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2471
d0c22119
BC		 2472 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2473 return RX_DROP_MONITOR;
2474
2157fdd6
TP		 2475 /* frame is in RMC, don't forward */
2476 if (ieee80211_is_data(hdr->frame_control) &&
2477 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2478 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2479 return RX_DROP_MONITOR;
2480
5c90067c 2481 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2482 return RX_CONTINUE;
2483
2484 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2485 return RX_DROP_MONITOR;
2486
43b7b314 2487 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2488 struct mesh_path *mppath;
43b7b314
JC		 2489 char *proxied_addr;
2490 char *mpp_addr;
2491
2492 if (is_multicast_ether_addr(hdr->addr1)) {
2493 mpp_addr = hdr->addr3;
2494 proxied_addr = mesh_hdr->eaddr1;
5667c86a
RM		 2495 } else if ((mesh_hdr->flags & MESH_FLAGS_AE) ==
2496 MESH_FLAGS_AE_A5_A6) {
9b395bc3 2497 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2498 mpp_addr = hdr->addr4;
2499 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2500 } else {
2501 return RX_DROP_MONITOR;
43b7b314 2502 }
79617dee 2503
79617dee 2504 rcu_read_lock();
bf7cd94d 2505 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2506 if (!mppath) {
bf7cd94d 2507 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2508 } else {
2509 spin_lock_bh(&mppath->state_lock);
b203ca39 2510 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2511 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
ab1c7906 2512 mppath->exp_time = jiffies;
79617dee
Y		 2513 spin_unlock_bh(&mppath->state_lock);
2514 }
2515 rcu_read_unlock();
2516 }
2517
3c5772a5
JC		 2518 /* Frame has reached destination. Don't forward */
2519 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2520 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2521 return RX_CONTINUE;
2522
cf440128
MK		 2523 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2524 q = sdata->vif.hw_queue[ac];
d3c1597b 2525 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2526 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2527 return RX_DROP_MONITOR;
2528 }
2529 skb_set_queue_mapping(skb, q);
e32f85f7 2530
30789eb6
TP		 2531 if (!--mesh_hdr->ttl) {
2532 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2533 goto out;
30789eb6
TP		 2534 }
2535
d665508b
CYY		 2536 if (!ifmsh->mshcfg.dot11MeshForwarding)
2537 goto out;
2538
c38c39bf
CI		 2539 fwd_skb = skb_copy_expand(skb, local->tx_headroom +
2540 sdata->encrypt_headroom, 0, GFP_ATOMIC);
30789eb6 2541 if (!fwd_skb) {
bdcbd8e0 2542 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2543 sdata->name);
30789eb6
TP		 2544 goto out;
2545 }
2546
2547 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2548 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2549 info = IEEE80211_SKB_CB(fwd_skb);
2550 memset(info, 0, sizeof(*info));
2551 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2552 info->control.vif = &rx->sdata->vif;
2553 info->control.jiffies = jiffies;
2554 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2555 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2556 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2557 /* update power mode indication when forwarding */
2558 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2559 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2560 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2561 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2562 } else {
2563 /* unable to resolve next hop */
bf7cd94d 2564 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2565 fwd_hdr->addr3, 0,
2566 WLAN_REASON_MESH_PATH_NOFORWARD,
2567 fwd_hdr->addr2);
30789eb6 2568 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2569 kfree_skb(fwd_skb);
30789eb6 2570 return RX_DROP_MONITOR;
e32f85f7
LCC		 2571 }
2572
30789eb6
TP		 2573 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2574 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2575 out:
df140465 2576 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2577 return RX_CONTINUE;
df140465 2578 return RX_DROP_MONITOR;
e32f85f7 2579}
bf94e17b 2580#endif
e32f85f7 2581
49461622 2582static ieee80211_rx_result debug_noinline
5cf121c3 2583ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2584{
eb9fb5b8 2585 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2586 struct ieee80211_local *local = rx->local;
eb9fb5b8 2587 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2589 __le16 fc = hdr->frame_control;
4114fa21 2590 bool port_control;
ce3edf6d 2591 int err;
76ee65bf 2592
358c8d9d 2593 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2594 return RX_CONTINUE;
76ee65bf 2595
358c8d9d 2596 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2597 return RX_DROP_MONITOR;
76ee65bf 2598
f14543ee 2599 /*
e7f4a940
JB		 2600 * Send unexpected-4addr-frame event to hostapd. For older versions,
2601 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2602 */
2603 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2604 sdata->vif.type == NL80211_IFTYPE_AP) {
2605 if (rx->sta &&
2606 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2607 cfg80211_rx_unexpected_4addr_frame(
2608 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2609 return RX_DROP_MONITOR;
e7f4a940 2610 }
f14543ee 2611
4114fa21 2612 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2613 if (unlikely(err))
e4c26add 2614 return RX_DROP_UNUSABLE;
76ee65bf 2615
358c8d9d 2616 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2617 return RX_DROP_MONITOR;
ce3edf6d 2618
8a4d32f3
AN		 2619 /* directly handle TDLS channel switch requests/responses */
2620 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2621 cpu_to_be16(ETH_P_TDLS))) {
2622 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2623
2624 if (pskb_may_pull(rx->skb,
2625 offsetof(struct ieee80211_tdls_data, u)) &&
2626 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2627 tf->category == WLAN_CATEGORY_TDLS &&
2628 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2629 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2630 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2631 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2632 if (rx->sta)
e5a9f8d0 2633 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2634
2635 return RX_QUEUED;
2636 }
2637 }
2638
4114fa21
FF		 2639 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2640 unlikely(port_control) && sdata->bss) {
2641 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2642 u.ap);
2643 dev = sdata->dev;
2644 rx->sdata = sdata;
2645 }
2646
76ee65bf
RR		 2647 rx->skb->dev = dev;
2648
602fae42
JB		 2649 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2650 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2651 !is_multicast_ether_addr(
2652 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2653 (!local->scanning &&
602fae42
JB		 2654 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2655 mod_timer(&local->dynamic_ps_timer, jiffies +
2656 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
e15276a4 2657
76ee65bf 2658 ieee80211_deliver_skb(rx);
571ecf67 2659
9ae54c84 2660 return RX_QUEUED;
571ecf67
JB		 2661}
2662
49461622 2663static ieee80211_rx_result debug_noinline
f9e124fb 2664ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2665{
71364716 2666 struct sk_buff *skb = rx->skb;
a7767f95 2667 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2668 struct tid_ampdu_rx *tid_agg_rx;
2669 u16 start_seq_num;
2670 u16 tid;
2671
a7767f95 2672 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2673 return RX_CONTINUE;
71364716 2674
a7767f95 2675 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2676 struct {
2677 __le16 control, start_seq_num;
2678 } __packed bar_data;
6382246e
EG		 2679 struct ieee80211_event event = {
2680 .type = BAR_RX_EVENT,
2681 };
8ae5977f 2682
71364716 2683 if (!rx->sta)
a02ae758 2684 return RX_DROP_MONITOR;
8ae5977f
JB		 2685
2686 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2687 &bar_data, sizeof(bar_data)))
2688 return RX_DROP_MONITOR;
2689
8ae5977f 2690 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d 2691
53f24974
JB		 2692 if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
2693 !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
2694 ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
2695 WLAN_BACK_RECIPIENT,
2696 WLAN_REASON_QSTA_REQUIRE_SETUP);
2697
a87f736d
JB		 2698 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2699 if (!tid_agg_rx)
a02ae758 2700 return RX_DROP_MONITOR;
71364716 2701
8ae5977f 2702 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2703 event.u.ba.tid = tid;
2704 event.u.ba.ssn = start_seq_num;
2705 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2706
2707 /* reset session timer */
20ad19d0
JB		 2708 if (tid_agg_rx->timeout)
2709 mod_timer(&tid_agg_rx->session_timer,
2710 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2711
dd318575 2712 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2713 /* release stored frames up to start of BAR */
d3b2fb53 2714 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2715 start_seq_num, frames);
dd318575
JB		 2716 spin_unlock(&tid_agg_rx->reorder_lock);
2717
6382246e
EG		 2718 drv_event_callback(rx->local, rx->sdata, &event);
2719
a02ae758
JB		 2720 kfree_skb(skb);
2721 return RX_QUEUED;
71364716
RR		 2722 }
2723
08daecae
JB		 2724 /*
2725 * After this point, we only want management frames,
2726 * so we can drop all remaining control frames to
2727 * cooked monitor interfaces.
2728 */
2729 return RX_DROP_MONITOR;
71364716
RR		 2730}
2731
f4f727a6
JM		 2732static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2733 struct ieee80211_mgmt *mgmt,
2734 size_t len)
fea14732
JM		 2735{
2736 struct ieee80211_local *local = sdata->local;
2737 struct sk_buff *skb;
2738 struct ieee80211_mgmt *resp;
2739
b203ca39 2740 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2741 /* Not to own unicast address */
2742 return;
2743 }
2744
b203ca39
JP		 2745 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2746 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2747 /* Not from the current AP or not associated yet. */
fea14732
JM		 2748 return;
2749 }
2750
2751 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2752 /* Too short SA Query request frame */
2753 return;
2754 }
2755
2756 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2757 if (skb == NULL)
2758 return;
2759
2760 skb_reserve(skb, local->hw.extra_tx_headroom);
2761 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2762 memset(resp, 0, 24);
2763 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2764 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2765 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2766 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2767 IEEE80211_STYPE_ACTION);
2768 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2769 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2770 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2771 memcpy(resp->u.action.u.sa_query.trans_id,
2772 mgmt->u.action.u.sa_query.trans_id,
2773 WLAN_SA_QUERY_TR_ID_LEN);
2774
62ae67be 2775 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2776}
2777
2e161f78
JB		 2778static ieee80211_rx_result debug_noinline
2779ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2780{
2781 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2782 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2783
2784 /*
2785 * From here on, look only at management frames.
2786 * Data and control frames are already handled,
2787 * and unknown (reserved) frames are useless.
2788 */
2789 if (rx->skb->len < 24)
2790 return RX_DROP_MONITOR;
2791
2792 if (!ieee80211_is_mgmt(mgmt->frame_control))
2793 return RX_DROP_MONITOR;
2794
ee971924
JB		 2795 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2796 ieee80211_is_beacon(mgmt->frame_control) &&
2797 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2798 int sig = 0;
2799
30686bf7 2800 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2801 sig = status->signal;
2802
ee971924
JB		 2803 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2804 rx->skb->data, rx->skb->len,
37c73b5f 2805 status->freq, sig);
ee971924
JB		 2806 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2807 }
2808
2e161f78
JB		 2809 if (ieee80211_drop_unencrypted_mgmt(rx))
2810 return RX_DROP_UNUSABLE;
2811
2812 return RX_CONTINUE;
2813}
2814
de1ede7a
JB		 2815static ieee80211_rx_result debug_noinline
2816ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2817{
2818 struct ieee80211_local *local = rx->local;
eb9fb5b8 2819 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2820 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2821 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2822 int len = rx->skb->len;
2823
2824 if (!ieee80211_is_action(mgmt->frame_control))
2825 return RX_CONTINUE;
2826
026331c4
JM		 2827 /* drop too small frames */
2828 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2829 return RX_DROP_UNUSABLE;
de1ede7a 2830
815b8092 2831 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2832 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2833 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2834 return RX_DROP_UNUSABLE;
de1ede7a 2835
de1ede7a 2836 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2837 case WLAN_CATEGORY_HT:
2838 /* reject HT action frames from stations not supporting HT */
2839 if (!rx->sta->sta.ht_cap.ht_supported)
2840 goto invalid;
2841
2842 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2843 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2844 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2845 sdata->vif.type != NL80211_IFTYPE_AP &&
2846 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2847 break;
2848
ec61cd63 2849 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2850 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2851 goto invalid;
2852
2853 switch (mgmt->u.action.u.ht_smps.action) {
2854 case WLAN_HT_ACTION_SMPS: {
2855 struct ieee80211_supported_band *sband;
af0ed69b 2856 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2857
2858 /* convert to HT capability */
2859 switch (mgmt->u.action.u.ht_smps.smps_control) {
2860 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2861 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2862 break;
2863 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2864 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2865 break;
2866 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2867 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2868 break;
2869 default:
2870 goto invalid;
2871 }
1d8d3dec
JB		 2872
2873 /* if no change do nothing */
af0ed69b 2874 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2875 goto handled;
af0ed69b 2876 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2877
2878 sband = rx->local->hw.wiphy->bands[status->band];
2879
64f68e5d
JB		 2880 rate_control_rate_update(local, sband, rx->sta,
2881 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2882 goto handled;
2883 }
ec61cd63
JB		 2884 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2885 struct ieee80211_supported_band *sband;
2886 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2887 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2888
2889 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2890 if (!(rx->sta->sta.ht_cap.cap &
2891 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2892 goto handled;
2893
e1a0c6b3 2894 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2895 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2896 else
1c45c5ce
EP		 2897 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2898
2899 /* set cur_max_bandwidth and recalc sta bw */
2900 rx->sta->cur_max_bandwidth = max_bw;
2901 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2902
e1a0c6b3 2903 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2904 goto handled;
2905
1c45c5ce 2906 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2907 sband = rx->local->hw.wiphy->bands[status->band];
2908
2909 rate_control_rate_update(local, sband, rx->sta,
2910 IEEE80211_RC_BW_CHANGED);
2911 goto handled;
2912 }
1d8d3dec
JB		 2913 default:
2914 goto invalid;
2915 }
2916
0af83d3d 2917 break;
1b3a2e49
JB		 2918 case WLAN_CATEGORY_PUBLIC:
2919 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2920 goto invalid;
2921 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2922 break;
2923 if (!rx->sta)
2924 break;
2925 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2926 break;
2927 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2928 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2929 break;
2930 if (len < offsetof(struct ieee80211_mgmt,
2931 u.action.u.ext_chan_switch.variable))
2932 goto invalid;
2933 goto queue;
0af83d3d
JB		 2934 case WLAN_CATEGORY_VHT:
2935 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2936 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2937 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2938 sdata->vif.type != NL80211_IFTYPE_AP &&
2939 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2940 break;
2941
2942 /* verify action code is present */
2943 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2944 goto invalid;
2945
2946 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2947 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
0af83d3d
JB		 2948 /* verify opmode is present */
2949 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2950 goto invalid;
d2941df8 2951 goto queue;
0af83d3d 2952 }
23a1f8d4
SS		 2953 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2954 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2955 goto invalid;
2956 goto queue;
2957 }
0af83d3d
JB		 2958 default:
2959 break;
2960 }
1d8d3dec 2961 break;
de1ede7a 2962 case WLAN_CATEGORY_BACK:
8abd3f9b 2963 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2964 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2965 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2966 sdata->vif.type != NL80211_IFTYPE_AP &&
2967 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2968 break;
8abd3f9b 2969
026331c4
JM		 2970 /* verify action_code is present */
2971 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2972 break;
2973
de1ede7a
JB		 2974 switch (mgmt->u.action.u.addba_req.action_code) {
2975 case WLAN_ACTION_ADDBA_REQ:
2976 if (len < (IEEE80211_MIN_ACTION_SIZE +
2977 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2978 goto invalid;
2979 break;
de1ede7a
JB		 2980 case WLAN_ACTION_ADDBA_RESP:
2981 if (len < (IEEE80211_MIN_ACTION_SIZE +
2982 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2983 goto invalid;
2984 break;
de1ede7a
JB		 2985 case WLAN_ACTION_DELBA:
2986 if (len < (IEEE80211_MIN_ACTION_SIZE +
2987 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2988 goto invalid;
2989 break;
2990 default:
2991 goto invalid;
de1ede7a 2992 }
bed7ee6e 2993
8b58ff83 2994 goto queue;
39192c0b 2995 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2996 /* verify action_code is present */
2997 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2998 break;
2999
39192c0b
JB		 3000 switch (mgmt->u.action.u.measurement.action_code) {
3001 case WLAN_ACTION_SPCT_MSR_REQ:
57fbcce3 3002 if (status->band != NL80211_BAND_5GHZ)
cd7760e6
SW		 3003 break;
3004
39192c0b
JB		 3005 if (len < (IEEE80211_MIN_ACTION_SIZE +
3006 sizeof(mgmt->u.action.u.measurement)))
84040805 3007 break;
cd7760e6
SW		 3008
3009 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3010 break;
3011
39192c0b 3012 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 3013 goto handled;
cd7760e6
SW		 3014 case WLAN_ACTION_SPCT_CHL_SWITCH: {
3015 u8 *bssid;
3016 if (len < (IEEE80211_MIN_ACTION_SIZE +
3017 sizeof(mgmt->u.action.u.chan_switch)))
84040805 3018 break;
cc32abd4 3019
cd7760e6 3020 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 3021 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3022 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 3023 break;
3024
3025 if (sdata->vif.type == NL80211_IFTYPE_STATION)
3026 bssid = sdata->u.mgd.bssid;
3027 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3028 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 3029 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
3030 bssid = mgmt->sa;
cd7760e6
SW		 3031 else
3032 break;
3033
3034 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 3035 break;
c481ec97 3036
8b58ff83 3037 goto queue;
cd7760e6 3038 }
39192c0b
JB		 3039 }
3040 break;
fea14732
JM		 3041 case WLAN_CATEGORY_SA_QUERY:
3042 if (len < (IEEE80211_MIN_ACTION_SIZE +
3043 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 3044 break;
3045
fea14732
JM		 3046 switch (mgmt->u.action.u.sa_query.action) {
3047 case WLAN_ACTION_SA_QUERY_REQUEST:
3048 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 3049 break;
fea14732 3050 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 3051 goto handled;
fea14732
JM		 3052 }
3053 break;
8db09850 3054 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 3055 if (len < (IEEE80211_MIN_ACTION_SIZE +
3056 sizeof(mgmt->u.action.u.self_prot.action_code)))
3057 break;
3058
8db09850
TP		 3059 switch (mgmt->u.action.u.self_prot.action_code) {
3060 case WLAN_SP_MESH_PEERING_OPEN:
3061 case WLAN_SP_MESH_PEERING_CLOSE:
3062 case WLAN_SP_MESH_PEERING_CONFIRM:
3063 if (!ieee80211_vif_is_mesh(&sdata->vif))
3064 goto invalid;
a6dad6a2 3065 if (sdata->u.mesh.user_mpm)
8db09850
TP		 3066 /* userspace handles this frame */
3067 break;
3068 goto queue;
3069 case WLAN_SP_MGK_INFORM:
3070 case WLAN_SP_MGK_ACK:
3071 if (!ieee80211_vif_is_mesh(&sdata->vif))
3072 goto invalid;
3073 break;
3074 }
3075 break;
d3aaec8a 3076 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 3077 if (len < (IEEE80211_MIN_ACTION_SIZE +
3078 sizeof(mgmt->u.action.u.mesh_action.action_code)))
3079 break;
3080
77a121c3
JB		 3081 if (!ieee80211_vif_is_mesh(&sdata->vif))
3082 break;
25d49e4d 3083 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 3084 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 3085 break;
3086 goto queue;
84040805 3087 }
026331c4 3088
2e161f78
JB		 3089 return RX_CONTINUE;
3090
bed7ee6e 3091 invalid:
554891e6 3092 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 3093 /* will return in the next handlers */
3094 return RX_CONTINUE;
3095
3096 handled:
3097 if (rx->sta)
e5a9f8d0 3098 rx->sta->rx_stats.packets++;
2e161f78
JB		 3099 dev_kfree_skb(rx->skb);
3100 return RX_QUEUED;
3101
3102 queue:
3103 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
3104 skb_queue_tail(&sdata->skb_queue, rx->skb);
3105 ieee80211_queue_work(&local->hw, &sdata->work);
3106 if (rx->sta)
e5a9f8d0 3107 rx->sta->rx_stats.packets++;
2e161f78
JB		 3108 return RX_QUEUED;
3109}
3110
3111static ieee80211_rx_result debug_noinline
3112ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
3113{
554891e6 3114 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 3115 int sig = 0;
2e161f78
JB		 3116
3117 /* skip known-bad action frames and return them in the next handler */
554891e6 3118 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 3119 return RX_CONTINUE;
d7907448 3120
026331c4
JM		 3121 /*
3122 * Getting here means the kernel doesn't know how to handle
3123 * it, but maybe userspace does ... include returned frames
3124 * so userspace can register for those to know whether ones
3125 * it transmitted were processed or returned.
3126 */
026331c4 3127
30686bf7 3128 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 3129 sig = status->signal;
3130
71bbc994 3131 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 3132 rx->skb->data, rx->skb->len, 0)) {
2e161f78 3133 if (rx->sta)
e5a9f8d0 3134 rx->sta->rx_stats.packets++;
2e161f78
JB		 3135 dev_kfree_skb(rx->skb);
3136 return RX_QUEUED;
3137 }
3138
2e161f78
JB		 3139 return RX_CONTINUE;
3140}
3141
3142static ieee80211_rx_result debug_noinline
3143ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
3144{
3145 struct ieee80211_local *local = rx->local;
3146 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
3147 struct sk_buff *nskb;
3148 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 3149 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 3150
3151 if (!ieee80211_is_action(mgmt->frame_control))
3152 return RX_CONTINUE;
3153
3154 /*
3155 * For AP mode, hostapd is responsible for handling any action
3156 * frames that we didn't handle, including returning unknown
3157 * ones. For all other modes we will return them to the sender,
3158 * setting the 0x80 bit in the action category, as required by
4b5ebccc 3159 * 802.11-2012 9.24.4.
2e161f78
JB		 3160 * Newer versions of hostapd shall also use the management frame
3161 * registration mechanisms, but older ones still use cooked
3162 * monitor interfaces so push all frames there.
3163 */
554891e6 3164 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 3165 (sdata->vif.type == NL80211_IFTYPE_AP ||
3166 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3167 return RX_DROP_MONITOR;
026331c4 3168
4b5ebccc
JB		 3169 if (is_multicast_ether_addr(mgmt->da))
3170 return RX_DROP_MONITOR;
3171
84040805
JB		 3172 /* do not return rejected action frames */
3173 if (mgmt->u.action.category & 0x80)
3174 return RX_DROP_UNUSABLE;
3175
3176 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3177 GFP_ATOMIC);
3178 if (nskb) {
292b4df6 3179 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 3180
292b4df6
JL		 3181 nmgmt->u.action.category |= 0x80;
3182 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3183 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 3184
3185 memset(nskb->cb, 0, sizeof(nskb->cb));
3186
07e5a5f5
JB		 3187 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3188 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3189
3190 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3191 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3192 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 3193 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 3194 info->hw_queue =
3195 local->hw.offchannel_tx_hw_queue;
3196 }
3197
3198 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3199 status->band);
de1ede7a 3200 }
39192c0b
JB		 3201 dev_kfree_skb(rx->skb);
3202 return RX_QUEUED;
de1ede7a
JB		 3203}
3204
49461622 3205static ieee80211_rx_result debug_noinline
5cf121c3 3206ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3207{
eb9fb5b8 3208 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3209 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3210 __le16 stype;
571ecf67 3211
77a121c3 3212 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3213
77a121c3
JB		 3214 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3215 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3216 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3217 sdata->vif.type != NL80211_IFTYPE_STATION)
3218 return RX_DROP_MONITOR;
472dbc45 3219
77a121c3 3220 switch (stype) {
66e67e41 3221 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3222 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3223 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3224 /* process for all: mesh, mlme, ibss */
3225 break;
66e67e41
JB		 3226 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3227 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3228 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3229 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3230 if (is_multicast_ether_addr(mgmt->da) &&
3231 !is_broadcast_ether_addr(mgmt->da))
3232 return RX_DROP_MONITOR;
3233
77a121c3
JB		 3234 /* process only for station */
3235 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3236 return RX_DROP_MONITOR;
3237 break;
3238 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3239 /* process only for ibss and mesh */
3240 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3241 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3242 return RX_DROP_MONITOR;
3243 break;
3244 default:
3245 return RX_DROP_MONITOR;
3246 }
f9d540ee 3247
77a121c3 3248 /* queue up frame and kick off work to process it */
c1475ca9 3249 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3250 skb_queue_tail(&sdata->skb_queue, rx->skb);
3251 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3252 if (rx->sta)
e5a9f8d0 3253 rx->sta->rx_stats.packets++;
46900298 3254
77a121c3 3255 return RX_QUEUED;
571ecf67
JB		 3256}
3257
5f0b7de5
JB		 3258static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3259 struct ieee80211_rate *rate)
3d30d949
MW		 3260{
3261 struct ieee80211_sub_if_data *sdata;
3262 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3263 struct sk_buff *skb = rx->skb, *skb2;
3264 struct net_device *prev_dev = NULL;
eb9fb5b8 3265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3266 int needed_headroom;
3d30d949 3267
554891e6
JB		 3268 /*
3269 * If cooked monitor has been processed already, then
3270 * don't do it again. If not, set the flag.
3271 */
3272 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3273 goto out_free_skb;
554891e6 3274 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3275
152c477a
JB		 3276 /* If there are no cooked monitor interfaces, just free the SKB */
3277 if (!local->cooked_mntrs)
3278 goto out_free_skb;
3279
1f7bba79
JB		 3280 /* vendor data is long removed here */
3281 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3282 /* room for the radiotap header based on driver features */
1f7bba79 3283 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3284
293702a3
JB		 3285 if (skb_headroom(skb) < needed_headroom &&
3286 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3287 goto out_free_skb;
3d30d949 3288
293702a3 3289 /* prepend radiotap information */
973ef21a
FF		 3290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3291 false);
3d30d949 3292
d57a544d 3293 skb_reset_mac_header(skb);
3d30d949
MW		 3294 skb->ip_summed = CHECKSUM_UNNECESSARY;
3295 skb->pkt_type = PACKET_OTHERHOST;
3296 skb->protocol = htons(ETH_P_802_2);
3297
3298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3299 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3300 continue;
3301
05c914fe 3302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
d8212184 3303 !(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES))
3d30d949
MW		 3304 continue;
3305
3306 if (prev_dev) {
3307 skb2 = skb_clone(skb, GFP_ATOMIC);
3308 if (skb2) {
3309 skb2->dev = prev_dev;
5548a8a1 3310 netif_receive_skb(skb2);
3d30d949
MW		 3311 }
3312 }
3313
3314 prev_dev = sdata->dev;
5a490510 3315 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3316 }
3317
3318 if (prev_dev) {
3319 skb->dev = prev_dev;
5548a8a1 3320 netif_receive_skb(skb);
554891e6
JB		 3321 return;
3322 }
3d30d949
MW		 3323
3324 out_free_skb:
3325 dev_kfree_skb(skb);
3326}
3327
aa0c8636
CL		 3328static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3329 ieee80211_rx_result res)
3330{
3331 switch (res) {
3332 case RX_DROP_MONITOR:
3333 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3334 if (rx->sta)
e5a9f8d0 3335 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3336 /* fall through */
3337 case RX_CONTINUE: {
3338 struct ieee80211_rate *rate = NULL;
3339 struct ieee80211_supported_band *sband;
3340 struct ieee80211_rx_status *status;
3341
3342 status = IEEE80211_SKB_RXCB((rx->skb));
3343
3344 sband = rx->local->hw.wiphy->bands[status->band];
da6a4352
JB		 3345 if (!(status->encoding == RX_ENC_HT) &&
3346 !(status->encoding == RX_ENC_VHT))
aa0c8636
CL		 3347 rate = &sband->bitrates[status->rate_idx];
3348
3349 ieee80211_rx_cooked_monitor(rx, rate);
3350 break;
3351 }
3352 case RX_DROP_UNUSABLE:
3353 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3354 if (rx->sta)
e5a9f8d0 3355 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3356 dev_kfree_skb(rx->skb);
3357 break;
3358 case RX_QUEUED:
3359 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3360 break;
3361 }
3362}
571ecf67 3363
f9e124fb
CL		 3364static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3365 struct sk_buff_head *frames)
58905290 3366{
58905290 3367 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3368 struct sk_buff *skb;
8944b79f 3369
e32f85f7
LCC		 3370#define CALL_RXH(rxh) \
3371 do { \
3372 res = rxh(rx); \
3373 if (res != RX_CONTINUE) \
2569a826 3374 goto rxh_next; \
8ebaa5b0 3375 } while (0)
49461622 3376
45ceeee8
JB		 3377 /* Lock here to avoid hitting all of the data used in the RX
3378 * path (e.g. key data, station data, ...) concurrently when
3379 * a frame is released from the reorder buffer due to timeout
3380 * from the timer, potentially concurrently with RX from the
3381 * driver.
3382 */
f9e124fb 3383 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3384
f9e124fb 3385 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3386 /*
3387 * all the other fields are valid across frames
3388 * that belong to an aMPDU since they are on the
3389 * same TID from the same station
3390 */
3391 rx->skb = skb;
3392
8ebaa5b0
JB		 3393 CALL_RXH(ieee80211_rx_h_check_more_data);
3394 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3395 CALL_RXH(ieee80211_rx_h_sta_process);
3396 CALL_RXH(ieee80211_rx_h_decrypt);
3397 CALL_RXH(ieee80211_rx_h_defragment);
3398 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
2569a826 3399 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3400#ifdef CONFIG_MAC80211_MESH
aa0c8636 3401 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3402 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3403#endif
8ebaa5b0
JB		 3404 CALL_RXH(ieee80211_rx_h_amsdu);
3405 CALL_RXH(ieee80211_rx_h_data);
f9e124fb
CL		 3406
3407 /* special treatment -- needs the queue */
3408 res = ieee80211_rx_h_ctrl(rx, frames);
3409 if (res != RX_CONTINUE)
3410 goto rxh_next;
3411
8ebaa5b0
JB		 3412 CALL_RXH(ieee80211_rx_h_mgmt_check);
3413 CALL_RXH(ieee80211_rx_h_action);
3414 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3415 CALL_RXH(ieee80211_rx_h_action_return);
3416 CALL_RXH(ieee80211_rx_h_mgmt);
49461622 3417
aa0c8636
CL		 3418 rxh_next:
3419 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3420
49461622 3421#undef CALL_RXH
aa0c8636 3422 }
24a8fdad 3423
f9e124fb 3424 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3425}
3426
4406c376 3427static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3428{
f9e124fb 3429 struct sk_buff_head reorder_release;
aa0c8636
CL		 3430 ieee80211_rx_result res = RX_DROP_MONITOR;
3431
f9e124fb
CL		 3432 __skb_queue_head_init(&reorder_release);
3433
aa0c8636
CL		 3434#define CALL_RXH(rxh) \
3435 do { \
3436 res = rxh(rx); \
3437 if (res != RX_CONTINUE) \
3438 goto rxh_next; \
8ebaa5b0 3439 } while (0)
aa0c8636 3440
8ebaa5b0
JB		 3441 CALL_RXH(ieee80211_rx_h_check_dup);
3442 CALL_RXH(ieee80211_rx_h_check);
aa0c8636 3443
f9e124fb 3444 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3445
f9e124fb 3446 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3447 return;
49461622 3448
2569a826 3449 rxh_next:
aa0c8636
CL		 3450 ieee80211_rx_handlers_result(rx, res);
3451
3452#undef CALL_RXH
58905290
JB		 3453}
3454
2bff8ebf 3455/*
dd318575
JB		 3456 * This function makes calls into the RX path, therefore
3457 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3458 */
3459void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3460{
f9e124fb 3461 struct sk_buff_head frames;
554891e6
JB		 3462 struct ieee80211_rx_data rx = {
3463 .sta = sta,
3464 .sdata = sta->sdata,
3465 .local = sta->local,
9e26297a
JB		 3466 /* This is OK -- must be QoS data frame */
3467 .security_idx = tid,
3468 .seqno_idx = tid,
af9f9b22 3469 .napi = NULL, /* must be NULL to not have races */
554891e6 3470 };
2c15a0cf
CL		 3471 struct tid_ampdu_rx *tid_agg_rx;
3472
3473 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3474 if (!tid_agg_rx)
3475 return;
2bff8ebf 3476
f9e124fb
CL		 3477 __skb_queue_head_init(&frames);
3478
2c15a0cf 3479 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3480 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3481 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3482
b497de63
EG		 3483 if (!skb_queue_empty(&frames)) {
3484 struct ieee80211_event event = {
3485 .type = BA_FRAME_TIMEOUT,
3486 .u.ba.tid = tid,
3487 .u.ba.sta = &sta->sta,
3488 };
3489 drv_event_callback(rx.local, rx.sdata, &event);
3490 }
3491
f9e124fb 3492 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3493}
3494
06470f74
SS		 3495void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3496 u16 ssn, u64 filtered,
3497 u16 received_mpdus)
3498{
3499 struct sta_info *sta;
3500 struct tid_ampdu_rx *tid_agg_rx;
3501 struct sk_buff_head frames;
3502 struct ieee80211_rx_data rx = {
3503 /* This is OK -- must be QoS data frame */
3504 .security_idx = tid,
3505 .seqno_idx = tid,
3506 };
3507 int i, diff;
3508
3509 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3510 return;
3511
3512 __skb_queue_head_init(&frames);
3513
3514 sta = container_of(pubsta, struct sta_info, sta);
3515
3516 rx.sta = sta;
3517 rx.sdata = sta->sdata;
3518 rx.local = sta->local;
3519
3520 rcu_read_lock();
3521 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3522 if (!tid_agg_rx)
3523 goto out;
3524
3525 spin_lock_bh(&tid_agg_rx->reorder_lock);
3526
3527 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3528 int release;
3529
3530 /* release all frames in the reorder buffer */
3531 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3532 IEEE80211_SN_MODULO;
3533 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3534 release, &frames);
3535 /* update ssn to match received ssn */
3536 tid_agg_rx->head_seq_num = ssn;
3537 } else {
3538 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3539 &frames);
3540 }
3541
3542 /* handle the case that received ssn is behind the mac ssn.
3543 * it can be tid_agg_rx->buf_size behind and still be valid */
3544 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3545 if (diff >= tid_agg_rx->buf_size) {
3546 tid_agg_rx->reorder_buf_filtered = 0;
3547 goto release;
3548 }
3549 filtered = filtered >> diff;
3550 ssn += diff;
3551
3552 /* update bitmap */
3553 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3554 int index = (ssn + i) % tid_agg_rx->buf_size;
3555
3556 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3557 if (filtered & BIT_ULL(i))
3558 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3559 }
3560
3561 /* now process also frames that the filter marking released */
3562 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3563
3564release:
3565 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3566
3567 ieee80211_rx_handlers(&rx, &frames);
3568
3569 out:
3570 rcu_read_unlock();
3571}
3572EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3573
571ecf67
JB		 3574/* main receive path */
3575
a58fbe1a 3576static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3577{
20b01f80 3578 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3579 struct sk_buff *skb = rx->skb;
a58fbe1a 3580 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3581 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3582 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
e5f2e067 3583 bool multicast = is_multicast_ether_addr(hdr->addr1);
23a24def 3584
51fb61e7 3585 switch (sdata->vif.type) {
05c914fe 3586 case NL80211_IFTYPE_STATION:
9bc383de 3587 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3588 return false;
a58fbe1a
JB		 3589 if (multicast)
3590 return true;
3591 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3592 case NL80211_IFTYPE_ADHOC:
23a24def 3593 if (!bssid)
3c2723f5 3594 return false;
6329b8d9
FF		 3595 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3596 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3597 return false;
a58fbe1a 3598 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3599 return true;
a58fbe1a 3600 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3601 return false;
a58fbe1a
JB		 3602 if (!multicast &&
3603 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3604 return false;
a58fbe1a 3605 if (!rx->sta) {
0fb8ca45 3606 int rate_idx;
da6a4352 3607 if (status->encoding != RX_ENC_LEGACY)
5614618e 3608 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3609 else
eb9fb5b8 3610 rate_idx = status->rate_idx;
8bf11d8d
JB		 3611 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3612 BIT(rate_idx));
0fb8ca45 3613 }
a58fbe1a 3614 return true;
239281f8
RL		 3615 case NL80211_IFTYPE_OCB:
3616 if (!bssid)
3617 return false;
cc117298 3618 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3619 return false;
a58fbe1a 3620 if (!is_broadcast_ether_addr(bssid))
239281f8 3621 return false;
a58fbe1a
JB		 3622 if (!multicast &&
3623 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3624 return false;
a58fbe1a 3625 if (!rx->sta) {
239281f8 3626 int rate_idx;
da6a4352 3627 if (status->encoding != RX_ENC_LEGACY)
239281f8
RL		 3628 rate_idx = 0; /* TODO: HT rates */
3629 else
3630 rate_idx = status->rate_idx;
3631 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3632 BIT(rate_idx));
3633 }
a58fbe1a 3634 return true;
05c914fe 3635 case NL80211_IFTYPE_MESH_POINT:
a58fbe1a
JB		 3636 if (multicast)
3637 return true;
3638 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3639 case NL80211_IFTYPE_AP_VLAN:
3640 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3641 if (!bssid)
3642 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3643
3644 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3645 /*
3646 * Accept public action frames even when the
3647 * BSSID doesn't match, this is used for P2P
3648 * and location updates. Note that mac80211
3649 * itself never looks at these frames.
3650 */
2b9ccd4e
JB		 3651 if (!multicast &&
3652 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3653 return false;
d48b2968 3654 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3655 return true;
5c90067c 3656 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3657 }
3658
3659 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3660 /* ignore data frames to TDLS-peers */
3661 if (ieee80211_is_data(hdr->frame_control))
3662 return false;
3663 /* ignore action frames to TDLS-peers */
3664 if (ieee80211_is_action(hdr->frame_control) &&
1ec7bae8 3665 !is_broadcast_ether_addr(bssid) &&
db8e1732
AN		 3666 !ether_addr_equal(bssid, hdr->addr1))
3667 return false;
23a24def 3668 }
3018e947
JB		 3669
3670 /*
3671 * 802.11-2016 Table 9-26 says that for data frames, A1 must be
3672 * the BSSID - we've checked that already but may have accepted
3673 * the wildcard (ff:ff:ff:ff:ff:ff).
3674 *
3675 * It also says:
3676 * The BSSID of the Data frame is determined as follows:
3677 * a) If the STA is contained within an AP or is associated
3678 * with an AP, the BSSID is the address currently in use
3679 * by the STA contained in the AP.
3680 *
3681 * So we should not accept data frames with an address that's
3682 * multicast.
3683 *
3684 * Accepting it also opens a security problem because stations
3685 * could encrypt it with the GTK and inject traffic that way.
3686 */
3687 if (ieee80211_is_data(hdr->frame_control) && multicast)
3688 return false;
3689
a58fbe1a 3690 return true;
05c914fe 3691 case NL80211_IFTYPE_WDS:
a7767f95 3692 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3693 return false;
a58fbe1a 3694 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3695 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3696 return ieee80211_is_public_action(hdr, skb->len) ||
3697 ieee80211_is_probe_req(hdr->frame_control) ||
3698 ieee80211_is_probe_resp(hdr->frame_control) ||
3699 ieee80211_is_beacon(hdr->frame_control);
cb3b7d87
AB		 3700 case NL80211_IFTYPE_NAN:
3701 /* Currently no frames on NAN interface are allowed */
3702 return false;
2ca27bcf 3703 default:
fb1c1cd6 3704 break;
23a24def
JB		 3705 }
3706
a58fbe1a
JB		 3707 WARN_ON_ONCE(1);
3708 return false;
23a24def
JB		 3709}
3710
49ddf8e6
JB		 3711void ieee80211_check_fast_rx(struct sta_info *sta)
3712{
3713 struct ieee80211_sub_if_data *sdata = sta->sdata;
3714 struct ieee80211_local *local = sdata->local;
3715 struct ieee80211_key *key;
3716 struct ieee80211_fast_rx fastrx = {
3717 .dev = sdata->dev,
3718 .vif_type = sdata->vif.type,
3719 .control_port_protocol = sdata->control_port_protocol,
3720 }, *old, *new = NULL;
3721 bool assign = false;
3722
3723 /* use sparse to check that we don't return without updating */
3724 __acquire(check_fast_rx);
3725
3726 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3727 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3728 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3729 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3730
c9c5962b
JB		 3731 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3732
49ddf8e6
JB		 3733 /* fast-rx doesn't do reordering */
3734 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3735 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3736 goto clear;
3737
3738 switch (sdata->vif.type) {
3739 case NL80211_IFTYPE_STATION:
3740 /* 4-addr is harder to deal with, later maybe */
3741 if (sdata->u.mgd.use_4addr)
3742 goto clear;
3743 /* software powersave is a huge mess, avoid all of it */
3744 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3745 goto clear;
3746 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3747 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3748 goto clear;
3749 if (sta->sta.tdls) {
3750 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3751 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3752 fastrx.expected_ds_bits = 0;
3753 } else {
3754 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3755 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3756 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3757 fastrx.expected_ds_bits =
3758 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3759 }
3760 break;
3761 case NL80211_IFTYPE_AP_VLAN:
3762 case NL80211_IFTYPE_AP:
3763 /* parallel-rx requires this, at least with calls to
3764 * ieee80211_sta_ps_transition()
3765 */
3766 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3767 goto clear;
3768 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3769 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3770 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3771
3772 fastrx.internal_forward =
3773 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3774 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3775 !sdata->u.vlan.sta);
3776 break;
3777 default:
3778 goto clear;
3779 }
3780
3781 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3782 goto clear;
3783
3784 rcu_read_lock();
3785 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3786 if (key) {
3787 switch (key->conf.cipher) {
3788 case WLAN_CIPHER_SUITE_TKIP:
3789 /* we don't want to deal with MMIC in fast-rx */
3790 goto clear_rcu;
3791 case WLAN_CIPHER_SUITE_CCMP:
3792 case WLAN_CIPHER_SUITE_CCMP_256:
3793 case WLAN_CIPHER_SUITE_GCMP:
3794 case WLAN_CIPHER_SUITE_GCMP_256:
3795 break;
3796 default:
3797 /* we also don't want to deal with WEP or cipher scheme
3798 * since those require looking up the key idx in the
3799 * frame, rather than assuming the PTK is used
3800 * (we need to revisit this once we implement the real
3801 * PTK index, which is now valid in the spec, but we
3802 * haven't implemented that part yet)
3803 */
3804 goto clear_rcu;
3805 }
3806
3807 fastrx.key = true;
3808 fastrx.icv_len = key->conf.icv_len;
3809 }
3810
3811 assign = true;
3812 clear_rcu:
3813 rcu_read_unlock();
3814 clear:
3815 __release(check_fast_rx);
3816
3817 if (assign)
3818 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3819
3820 spin_lock_bh(&sta->lock);
3821 old = rcu_dereference_protected(sta->fast_rx, true);
3822 rcu_assign_pointer(sta->fast_rx, new);
3823 spin_unlock_bh(&sta->lock);
3824
3825 if (old)
3826 kfree_rcu(old, rcu_head);
3827}
3828
3829void ieee80211_clear_fast_rx(struct sta_info *sta)
3830{
3831 struct ieee80211_fast_rx *old;
3832
3833 spin_lock_bh(&sta->lock);
3834 old = rcu_dereference_protected(sta->fast_rx, true);
3835 RCU_INIT_POINTER(sta->fast_rx, NULL);
3836 spin_unlock_bh(&sta->lock);
3837
3838 if (old)
3839 kfree_rcu(old, rcu_head);
3840}
3841
3842void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3843{
3844 struct ieee80211_local *local = sdata->local;
3845 struct sta_info *sta;
3846
3847 lockdep_assert_held(&local->sta_mtx);
3848
3849 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3850 if (sdata != sta->sdata &&
3851 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3852 continue;
3853 ieee80211_check_fast_rx(sta);
3854 }
3855}
3856
3857void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3858{
3859 struct ieee80211_local *local = sdata->local;
3860
3861 mutex_lock(&local->sta_mtx);
3862 __ieee80211_check_fast_rx_iface(sdata);
3863 mutex_unlock(&local->sta_mtx);
3864}
3865
3866static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3867 struct ieee80211_fast_rx *fast_rx)
3868{
3869 struct sk_buff *skb = rx->skb;
3870 struct ieee80211_hdr *hdr = (void *)skb->data;
3871 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3872 struct sta_info *sta = rx->sta;
3873 int orig_len = skb->len;
3874 int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3875 struct {
3876 u8 snap[sizeof(rfc1042_header)];
3877 __be16 proto;
3878 } *payload __aligned(2);
3879 struct {
3880 u8 da[ETH_ALEN];
3881 u8 sa[ETH_ALEN];
3882 } addrs __aligned(2);
c9c5962b
JB		 3883 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3884
3885 if (fast_rx->uses_rss)
3886 stats = this_cpu_ptr(sta->pcpu_rx_stats);
49ddf8e6
JB		 3887
3888 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3889 * to a common data structure; drivers can implement that per queue
3890 * but we don't have that information in mac80211
3891 */
3892 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3893 return false;
3894
3895#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3896
3897 /* If using encryption, we also need to have:
3898 * - PN_VALIDATED: similar, but the implementation is tricky
3899 * - DECRYPTED: necessary for PN_VALIDATED
3900 */
3901 if (fast_rx->key &&
3902 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3903 return false;
3904
3905 /* we don't deal with A-MSDU deaggregation here */
3906 if (status->rx_flags & IEEE80211_RX_AMSDU)
3907 return false;
3908
3909 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3910 return false;
3911
3912 if (unlikely(ieee80211_is_frag(hdr)))
3913 return false;
3914
3915 /* Since our interface address cannot be multicast, this
3916 * implicitly also rejects multicast frames without the
3917 * explicit check.
3918 *
3919 * We shouldn't get any *data* frames not addressed to us
3920 * (AP mode will accept multicast *management* frames), but
3921 * punting here will make it go through the full checks in
3922 * ieee80211_accept_frame().
3923 */
3924 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3925 return false;
3926
3927 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3928 IEEE80211_FCTL_TODS)) !=
3929 fast_rx->expected_ds_bits)
3930 goto drop;
3931
3932 /* assign the key to drop unencrypted frames (later)
3933 * and strip the IV/MIC if necessary
3934 */
3935 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3936 /* GCMP header length is the same */
3937 snap_offs += IEEE80211_CCMP_HDR_LEN;
3938 }
3939
3940 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3941 goto drop;
3942 payload = (void *)(skb->data + snap_offs);
3943
3944 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3945 return false;
3946
3947 /* Don't handle these here since they require special code.
3948 * Accept AARP and IPX even though they should come with a
3949 * bridge-tunnel header - but if we get them this way then
3950 * there's little point in discarding them.
3951 */
3952 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3953 payload->proto == fast_rx->control_port_protocol))
3954 return false;
3955
3956 /* after this point, don't punt to the slowpath! */
3957
3958 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3959 pskb_trim(skb, skb->len - fast_rx->icv_len))
3960 goto drop;
3961
3962 if (unlikely(fast_rx->sta_notify)) {
3963 ieee80211_sta_rx_notify(rx->sdata, hdr);
3964 fast_rx->sta_notify = false;
3965 }
3966
3967 /* statistics part of ieee80211_rx_h_sta_process() */
c9c5962b
JB		 3968 stats->last_rx = jiffies;
3969 stats->last_rate = sta_stats_encode_rate(status);
49ddf8e6 3970
c9c5962b 3971 stats->fragments++;
0328edc7 3972 stats->packets++;
49ddf8e6
JB		 3973
3974 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
c9c5962b
JB		 3975 stats->last_signal = status->signal;
3976 if (!fast_rx->uses_rss)
3977 ewma_signal_add(&sta->rx_stats_avg.signal,
3978 -status->signal);
49ddf8e6
JB		 3979 }
3980
3981 if (status->chains) {
3982 int i;
3983
c9c5962b 3984 stats->chains = status->chains;
49ddf8e6
JB		 3985 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3986 int signal = status->chain_signal[i];
3987
3988 if (!(status->chains & BIT(i)))
3989 continue;
3990
c9c5962b
JB		 3991 stats->chain_signal_last[i] = signal;
3992 if (!fast_rx->uses_rss)
3993 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3994 -signal);
49ddf8e6
JB		 3995 }
3996 }
3997 /* end of statistics */
3998
3999 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
4000 goto drop;
4001
4002 /* do the header conversion - first grab the addresses */
4003 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
4004 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
4005 /* remove the SNAP but leave the ethertype */
4006 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
4007 /* push the addresses in front */
4008 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
4009
4010 skb->dev = fast_rx->dev;
4011
4012 ieee80211_rx_stats(fast_rx->dev, skb->len);
4013
4014 /* The seqno index has the same property as needed
4015 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
4016 * for non-QoS-data frames. Here we know it's a data
4017 * frame, so count MSDUs.
4018 */
c9c5962b
JB		 4019 u64_stats_update_begin(&stats->syncp);
4020 stats->msdu[rx->seqno_idx]++;
4021 stats->bytes += orig_len;
4022 u64_stats_update_end(&stats->syncp);
49ddf8e6
JB		 4023
4024 if (fast_rx->internal_forward) {
eeb0d56f
JB		 4025 struct sk_buff *xmit_skb = NULL;
4026 bool multicast = is_multicast_ether_addr(skb->data);
49ddf8e6 4027
eeb0d56f
JB		 4028 if (multicast) {
4029 xmit_skb = skb_copy(skb, GFP_ATOMIC);
4030 } else if (sta_info_get(rx->sdata, skb->data)) {
4031 xmit_skb = skb;
4032 skb = NULL;
4033 }
49ddf8e6 4034
eeb0d56f 4035 if (xmit_skb) {
49ddf8e6
JB		 4036 /*
4037 * Send to wireless media and increase priority by 256
4038 * to keep the received priority instead of
4039 * reclassifying the frame (see cfg80211_classify8021d).
4040 */
eeb0d56f
JB		 4041 xmit_skb->priority += 256;
4042 xmit_skb->protocol = htons(ETH_P_802_3);
4043 skb_reset_network_header(xmit_skb);
4044 skb_reset_mac_header(xmit_skb);
4045 dev_queue_xmit(xmit_skb);
49ddf8e6 4046 }
eeb0d56f
JB		 4047
4048 if (!skb)
4049 return true;
49ddf8e6
JB		 4050 }
4051
4052 /* deliver to local stack */
4053 skb->protocol = eth_type_trans(skb, fast_rx->dev);
4054 memset(skb->cb, 0, sizeof(skb->cb));
4055 if (rx->napi)
4056 napi_gro_receive(rx->napi, skb);
4057 else
4058 netif_receive_skb(skb);
4059
4060 return true;
4061 drop:
4062 dev_kfree_skb(skb);
c9c5962b 4063 stats->dropped++;
49ddf8e6
JB		 4064 return true;
4065}
4066
4406c376
JB		 4067/*
4068 * This function returns whether or not the SKB
4069 * was destined for RX processing or not, which,
4070 * if consume is true, is equivalent to whether
4071 * or not the skb was consumed.
4072 */
4073static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
4074 struct sk_buff *skb, bool consume)
4075{
4076 struct ieee80211_local *local = rx->local;
4077 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 4078
4079 rx->skb = skb;
4406c376 4080
49ddf8e6
JB		 4081 /* See if we can do fast-rx; if we have to copy we already lost,
4082 * so punt in that case. We should never have to deliver a data
4083 * frame to multiple interfaces anyway.
4084 *
4085 * We skip the ieee80211_accept_frame() call and do the necessary
4086 * checking inside ieee80211_invoke_fast_rx().
4087 */
4088 if (consume && rx->sta) {
4089 struct ieee80211_fast_rx *fast_rx;
4090
4091 fast_rx = rcu_dereference(rx->sta->fast_rx);
4092 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
4093 return true;
4094 }
4095
a58fbe1a 4096 if (!ieee80211_accept_frame(rx))
4406c376
JB		 4097 return false;
4098
4406c376
JB		 4099 if (!consume) {
4100 skb = skb_copy(skb, GFP_ATOMIC);
4101 if (!skb) {
4102 if (net_ratelimit())
4103 wiphy_debug(local->hw.wiphy,
b305dae4 4104 "failed to copy skb for %s\n",
4406c376
JB		 4105 sdata->name);
4106 return true;
4107 }
4108
4109 rx->skb = skb;
4110 }
4111
4112 ieee80211_invoke_rx_handlers(rx);
4113 return true;
4114}
4115
571ecf67 4116/*
6b59db7d 4117 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 4118 * be called with rcu_read_lock protection.
571ecf67 4119 */
71ebb4aa 4120static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
d63b548f 4121 struct ieee80211_sta *pubsta,
af9f9b22
JB		 4122 struct sk_buff *skb,
4123 struct napi_struct *napi)
571ecf67
JB		 4124{
4125 struct ieee80211_local *local = hw_to_local(hw);
4126 struct ieee80211_sub_if_data *sdata;
571ecf67 4127 struct ieee80211_hdr *hdr;
e3cf8b3f 4128 __le16 fc;
5cf121c3 4129 struct ieee80211_rx_data rx;
4406c376 4130 struct ieee80211_sub_if_data *prev;
83e7e4ce 4131 struct rhlist_head *tmp;
e3cf8b3f 4132 int err = 0;
571ecf67 4133
e3cf8b3f 4134 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 4135 memset(&rx, 0, sizeof(rx));
4136 rx.skb = skb;
4137 rx.local = local;
af9f9b22 4138 rx.napi = napi;
72abd81b 4139
e3cf8b3f 4140 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 4141 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 4142
4a4f1a58
JB		 4143 if (ieee80211_is_mgmt(fc)) {
4144 /* drop frame if too short for header */
4145 if (skb->len < ieee80211_hdrlen(fc))
4146 err = -ENOBUFS;
4147 else
4148 err = skb_linearize(skb);
4149 } else {
e3cf8b3f 4150 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 4151 }
e3cf8b3f
ZY		 4152
4153 if (err) {
4154 dev_kfree_skb(skb);
4155 return;
4156 }
4157
4158 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 4159 ieee80211_parse_qos(&rx);
d1c3a37c 4160 ieee80211_verify_alignment(&rx);
38f3714d 4161
d48b2968
JB		 4162 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
4163 ieee80211_is_beacon(hdr->frame_control)))
4164 ieee80211_scan_rx(local, skb);
4165
19d19e96 4166 if (ieee80211_is_data(fc)) {
d63b548f 4167 struct sta_info *sta, *prev_sta;
7bedd0cf 4168
19d19e96
JB		 4169 if (pubsta) {
4170 rx.sta = container_of(pubsta, struct sta_info, sta);
4171 rx.sdata = rx.sta->sdata;
4172 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4173 return;
4174 goto out;
4175 }
4176
56af3268 4177 prev_sta = NULL;
4406c376 4178
83e7e4ce 4179 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 4180 if (!prev_sta) {
4181 prev_sta = sta;
4182 continue;
4183 }
4184
4185 rx.sta = prev_sta;
4186 rx.sdata = prev_sta->sdata;
4406c376 4187 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 4188
56af3268 4189 prev_sta = sta;
4406c376 4190 }
56af3268
BG		 4191
4192 if (prev_sta) {
4193 rx.sta = prev_sta;
4194 rx.sdata = prev_sta->sdata;
4195
4406c376 4196 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 4197 return;
8e26d5ad 4198 goto out;
56af3268 4199 }
4406c376
JB		 4200 }
4201
4b0dd98e 4202 prev = NULL;
b2e7771e 4203
4b0dd98e
JB		 4204 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4205 if (!ieee80211_sdata_running(sdata))
4206 continue;
340e11f3 4207
4b0dd98e
JB		 4208 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4209 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4210 continue;
340e11f3 4211
4b0dd98e
JB		 4212 /*
4213 * frame is destined for this interface, but if it's
4214 * not also for the previous one we handle that after
4215 * the loop to avoid copying the SKB once too much
4216 */
4bb29f8c 4217
4b0dd98e 4218 if (!prev) {
abe60632 4219 prev = sdata;
4b0dd98e 4220 continue;
340e11f3 4221 }
4bb29f8c 4222
7852e361 4223 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 4224 rx.sdata = prev;
4225 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 4226
4b0dd98e
JB		 4227 prev = sdata;
4228 }
4229
4230 if (prev) {
7852e361 4231 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 4232 rx.sdata = prev;
4406c376 4233
4b0dd98e
JB		 4234 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4235 return;
571ecf67 4236 }
4406c376 4237
8e26d5ad 4238 out:
4406c376 4239 dev_kfree_skb(skb);
571ecf67 4240}
6368e4b1
RR		 4241
4242/*
4243 * This is the receive path handler. It is called by a low level driver when an
4244 * 802.11 MPDU is received from the hardware.
4245 */
d63b548f
JB		 4246void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4247 struct sk_buff *skb, struct napi_struct *napi)
6368e4b1
RR		 4248{
4249 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 4250 struct ieee80211_rate *rate = NULL;
4251 struct ieee80211_supported_band *sband;
f1d58c25 4252 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 4253
d20ef63d
JB		 4254 WARN_ON_ONCE(softirq_count() == 0);
4255
57fbcce3 4256 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
77a980dc 4257 goto drop;
8318d78a
JB		 4258
4259 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 4260 if (WARN_ON(!sband))
4261 goto drop;
8318d78a 4262
89c3a8ac
JB		 4263 /*
4264 * If we're suspending, it is possible although not too likely
4265 * that we'd be receiving frames after having already partially
4266 * quiesced the stack. We can't process such frames then since
4267 * that might, for example, cause stations to be added or other
4268 * driver callbacks be invoked.
4269 */
77a980dc
JB		 4270 if (unlikely(local->quiescing || local->suspended))
4271 goto drop;
89c3a8ac 4272
04800ada
AN		 4273 /* We might be during a HW reconfig, prevent Rx for the same reason */
4274 if (unlikely(local->in_reconfig))
4275 goto drop;
4276
ea77f12f
JB		 4277 /*
4278 * The same happens when we're not even started,
4279 * but that's worth a warning.
4280 */
77a980dc
JB		 4281 if (WARN_ON(!local->started))
4282 goto drop;
ea77f12f 4283
fc885189 4284 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 4285 /*
fc885189
JB		 4286 * Validate the rate, unless a PLCP error means that
4287 * we probably can't have a valid rate here anyway.
e5d6eb83 4288 */
fc885189 4289
da6a4352
JB		 4290 switch (status->encoding) {
4291 case RX_ENC_HT:
fc885189
JB		 4292 /*
4293 * rate_idx is MCS index, which can be [0-76]
4294 * as documented on:
4295 *
4296 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4297 *
4298 * Anything else would be some sort of driver or
4299 * hardware error. The driver should catch hardware
4300 * errors.
4301 */
444e3803 4302 if (WARN(status->rate_idx > 76,
fc885189
JB		 4303 "Rate marked as an HT rate but passed "
4304 "status->rate_idx is not "
4305 "an MCS index [0-76]: %d (0x%02x)\n",
4306 status->rate_idx,
4307 status->rate_idx))
4308 goto drop;
da6a4352
JB		 4309 break;
4310 case RX_ENC_VHT:
5614618e 4311 if (WARN_ONCE(status->rate_idx > 9 ||
8613c948
JB		 4312 !status->nss ||
4313 status->nss > 8,
5614618e 4314 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
8613c948 4315 status->rate_idx, status->nss))
5614618e 4316 goto drop;
da6a4352
JB		 4317 break;
4318 default:
4319 WARN_ON_ONCE(1);
4320 /* fall through */
4321 case RX_ENC_LEGACY:
444e3803 4322 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 4323 goto drop;
4324 rate = &sband->bitrates[status->rate_idx];
4325 }
0fb8ca45 4326 }
6368e4b1 4327
554891e6
JB		 4328 status->rx_flags = 0;
4329
6368e4b1
RR		 4330 /*
4331 * key references and virtual interfaces are protected using RCU
4332 * and this requires that we are in a read-side RCU section during
4333 * receive processing
4334 */
4335 rcu_read_lock();
4336
4337 /*
4338 * Frames with failed FCS/PLCP checksum are not returned,
4339 * all other frames are returned without radiotap header
4340 * if it was previously present.
4341 * Also, frames with less than 16 bytes are dropped.
4342 */
f1d58c25 4343 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 4344 if (!skb) {
4345 rcu_read_unlock();
4346 return;
4347 }
4348
e1e54068
JB		 4349 ieee80211_tpt_led_trig_rx(local,
4350 ((struct ieee80211_hdr *)skb->data)->frame_control,
4351 skb->len);
d63b548f
JB		 4352
4353 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
6368e4b1
RR		 4354
4355 rcu_read_unlock();
77a980dc
JB		 4356
4357 return;
4358 drop:
4359 kfree_skb(skb);
6368e4b1 4360}
af9f9b22 4361EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 4362
4363/* This is a version of the rx handler that can be called from hard irq
4364 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 4365void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 4366{
4367 struct ieee80211_local *local = hw_to_local(hw);
4368
4369 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4370
571ecf67
JB		 4371 skb->pkt_type = IEEE80211_RX_MSG;
4372 skb_queue_tail(&local->skb_queue, skb);
4373 tasklet_schedule(&local->tasklet);
4374}
4375EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)