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Merge remote-tracking branches 'asoc/topic/ux500' and 'asoc/topic/wm8962' into asoc...
[deliverable/linux.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
fb4ea054 7 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
571ecf67
JB		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
ab46623e 14#include <linux/jiffies.h>
5a0e3ad6 15#include <linux/slab.h>
571ecf67
JB		 16#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
d4e46a3d 20#include <linux/rcupdate.h>
bc3b2d7f 21#include <linux/export.h>
06470f74 22#include <linux/bitops.h>
571ecf67
JB		 23#include <net/mac80211.h>
24#include <net/ieee80211_radiotap.h>
d26ad377 25#include <asm/unaligned.h>
571ecf67
JB		 26
27#include "ieee80211_i.h"
24487981 28#include "driver-ops.h"
2c8dccc7 29#include "led.h"
33b64eb2 30#include "mesh.h"
571ecf67
JB		 31#include "wep.h"
32#include "wpa.h"
33#include "tkip.h"
34#include "wme.h"
1d8d3dec 35#include "rate.h"
571ecf67 36
5a490510
JB		 37static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
38{
39 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
40
41 u64_stats_update_begin(&tstats->syncp);
42 tstats->rx_packets++;
43 tstats->rx_bytes += len;
44 u64_stats_update_end(&tstats->syncp);
45}
46
a6828493
JB		 47static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
49{
50 __le16 fc = hdr->frame_control;
51
52 if (ieee80211_is_data(fc)) {
53 if (len < 24) /* drop incorrect hdr len (data) */
54 return NULL;
55
56 if (ieee80211_has_a4(fc))
57 return NULL;
58 if (ieee80211_has_tods(fc))
59 return hdr->addr1;
60 if (ieee80211_has_fromds(fc))
61 return hdr->addr2;
62
63 return hdr->addr3;
64 }
65
66 if (ieee80211_is_mgmt(fc)) {
67 if (len < 24) /* drop incorrect hdr len (mgmt) */
68 return NULL;
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_ctl(fc)) {
73 if (ieee80211_is_pspoll(fc))
74 return hdr->addr1;
75
76 if (ieee80211_is_back_req(fc)) {
77 switch (type) {
78 case NL80211_IFTYPE_STATION:
79 return hdr->addr2;
80 case NL80211_IFTYPE_AP:
81 case NL80211_IFTYPE_AP_VLAN:
82 return hdr->addr1;
83 default:
84 break; /* fall through to the return */
85 }
86 }
87 }
88
89 return NULL;
90}
91
b2e7771e
JB		 92/*
93 * monitor mode reception
94 *
95 * This function cleans up the SKB, i.e. it removes all the stuff
96 * only useful for monitoring.
97 */
98static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
1f7bba79
JB		 99 struct sk_buff *skb,
100 unsigned int rtap_vendor_space)
b2e7771e 101{
30686bf7 102 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
b2e7771e 103 if (likely(skb->len > FCS_LEN))
e3cf8b3f 104 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 105 else {
106 /* driver bug */
107 WARN_ON(1);
108 dev_kfree_skb(skb);
0624760c 109 return NULL;
b2e7771e
JB		 110 }
111 }
112
1f7bba79
JB		 113 __pskb_pull(skb, rtap_vendor_space);
114
b2e7771e
JB		 115 return skb;
116}
117
1f7bba79
JB		 118static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
119 unsigned int rtap_vendor_space)
b2e7771e 120{
f1d58c25 121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 122 struct ieee80211_hdr *hdr;
123
124 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 125
4c298677 126 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
17883048
GB		 127 RX_FLAG_FAILED_PLCP_CRC |
128 RX_FLAG_ONLY_MONITOR))
6b59db7d
ZG		 129 return true;
130
1f7bba79 131 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 132 return true;
133
87228f57
HH		 134 if (ieee80211_is_ctl(hdr->frame_control) &&
135 !ieee80211_is_pspoll(hdr->frame_control) &&
136 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 137 return true;
138
139 return false;
b2e7771e
JB		 140}
141
601ae7f2 142static int
1f7bba79
JB		 143ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
144 struct ieee80211_rx_status *status,
145 struct sk_buff *skb)
601ae7f2
BR		 146{
147 int len;
148
149 /* always present fields */
a144f378 150 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 151
a144f378 152 /* allocate extra bitmaps */
a144f378
JB		 153 if (status->chains)
154 len += 4 * hweight8(status->chains);
90b9e446
JB		 155
156 if (ieee80211_have_rx_timestamp(status)) {
157 len = ALIGN(len, 8);
601ae7f2 158 len += 8;
90b9e446 159 }
30686bf7 160 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 161 len += 1;
601ae7f2 162
a144f378
JB		 163 /* antenna field, if we don't have per-chain info */
164 if (!status->chains)
165 len += 1;
166
90b9e446
JB		 167 /* padding for RX_FLAGS if necessary */
168 len = ALIGN(len, 2);
601ae7f2 169
6d744bac
JB		 170 if (status->flag & RX_FLAG_HT) /* HT info */
171 len += 3;
172
4c298677 173 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 174 len = ALIGN(len, 4);
4c298677
JB		 175 len += 8;
176 }
177
51648921
JB		 178 if (status->flag & RX_FLAG_VHT) {
179 len = ALIGN(len, 2);
180 len += 12;
181 }
182
a144f378
JB		 183 if (status->chains) {
184 /* antenna and antenna signal fields */
185 len += 2 * hweight8(status->chains);
186 }
187
1f7bba79
JB		 188 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
189 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
190
191 /* vendor presence bitmap */
192 len += 4;
193 /* alignment for fixed 6-byte vendor data header */
194 len = ALIGN(len, 2);
195 /* vendor data header */
196 len += 6;
197 if (WARN_ON(rtap->align == 0))
198 rtap->align = 1;
199 len = ALIGN(len, rtap->align);
200 len += rtap->len + rtap->pad;
201 }
202
601ae7f2
BR		 203 return len;
204}
205
00ea6deb 206/*
601ae7f2
BR		 207 * ieee80211_add_rx_radiotap_header - add radiotap header
208 *
209 * add a radiotap header containing all the fields which the hardware provided.
210 */
211static void
212ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
213 struct sk_buff *skb,
601ae7f2 214 struct ieee80211_rate *rate,
973ef21a 215 int rtap_len, bool has_fcs)
601ae7f2 216{
f1d58c25 217 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 218 struct ieee80211_radiotap_header *rthdr;
219 unsigned char *pos;
a144f378
JB		 220 __le32 *it_present;
221 u32 it_present_val;
6a86b9c7 222 u16 rx_flags = 0;
a5e70697 223 u16 channel_flags = 0;
a144f378
JB		 224 int mpdulen, chain;
225 unsigned long chains = status->chains;
1f7bba79
JB		 226 struct ieee80211_vendor_radiotap rtap = {};
227
228 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
229 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
230 /* rtap.len and rtap.pad are undone immediately */
231 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
232 }
f4bda337
TP		 233
234 mpdulen = skb->len;
30686bf7 235 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 236 mpdulen += FCS_LEN;
601ae7f2
BR		 237
238 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 239 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 240 it_present = &rthdr->it_present;
601ae7f2
BR		 241
242 /* radiotap header, set always present flags */
0059b2b1 243 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 244 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
245 BIT(IEEE80211_RADIOTAP_CHANNEL) |
246 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
247
248 if (!status->chains)
249 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
250
251 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
252 it_present_val |=
253 BIT(IEEE80211_RADIOTAP_EXT) |
254 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
255 put_unaligned_le32(it_present_val, it_present);
256 it_present++;
257 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
258 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
259 }
601ae7f2 260
1f7bba79
JB		 261 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
262 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
263 BIT(IEEE80211_RADIOTAP_EXT);
264 put_unaligned_le32(it_present_val, it_present);
265 it_present++;
266 it_present_val = rtap.present;
267 }
268
a144f378
JB		 269 put_unaligned_le32(it_present_val, it_present);
270
271 pos = (void *)(it_present + 1);
272
601ae7f2
BR		 273 /* the order of the following fields is important */
274
275 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 276 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 277 /* padding */
278 while ((pos - (u8 *)rthdr) & 7)
279 *pos++ = 0;
f4bda337
TP		 280 put_unaligned_le64(
281 ieee80211_calculate_rx_timestamp(local, status,
282 mpdulen, 0),
283 pos);
1df332e8 284 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 285 pos += 8;
286 }
287
288 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 289 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 290 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 291 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
292 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 293 if (status->flag & RX_FLAG_SHORTPRE)
294 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 295 pos++;
296
297 /* IEEE80211_RADIOTAP_RATE */
5614618e 298 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 299 /*
f8d1ccf1 300 * Without rate information don't add it. If we have,
38f37be2 301 * MCS information is a separate field in radiotap,
73b48099
JB		 302 * added below. The byte here is needed as padding
303 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 304 */
305 *pos = 0;
8d6f658e 306 } else {
2103dec1 307 int shift = 0;
ebe6c7ba 308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 309 if (status->flag & RX_FLAG_10MHZ)
310 shift = 1;
311 else if (status->flag & RX_FLAG_5MHZ)
312 shift = 2;
313 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 314 }
601ae7f2
BR		 315 pos++;
316
317 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 318 put_unaligned_le16(status->freq, pos);
601ae7f2 319 pos += 2;
a5e70697
SW		 320 if (status->flag & RX_FLAG_10MHZ)
321 channel_flags |= IEEE80211_CHAN_HALF;
322 else if (status->flag & RX_FLAG_5MHZ)
323 channel_flags |= IEEE80211_CHAN_QUARTER;
324
57fbcce3 325 if (status->band == NL80211_BAND_5GHZ)
a5e70697 326 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 327 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 328 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 329 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 330 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 331 else if (rate)
3a5c5e81 332 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 333 else
a5e70697
SW		 334 channel_flags |= IEEE80211_CHAN_2GHZ;
335 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 336 pos += 2;
337
338 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 339 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 340 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 341 *pos = status->signal;
342 rthdr->it_present |=
343 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
344 pos++;
345 }
346
601ae7f2
BR		 347 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
348
a144f378
JB		 349 if (!status->chains) {
350 /* IEEE80211_RADIOTAP_ANTENNA */
351 *pos = status->antenna;
352 pos++;
353 }
601ae7f2 354
601ae7f2
BR		 355 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
356
357 /* IEEE80211_RADIOTAP_RX_FLAGS */
358 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 359 if ((pos - (u8 *)rthdr) & 1)
90b9e446 360 *pos++ = 0;
aae89831 361 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 362 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
363 put_unaligned_le16(rx_flags, pos);
601ae7f2 364 pos += 2;
6d744bac
JB		 365
366 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 367 unsigned int stbc;
368
6d744bac 369 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 370 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 371 *pos = 0;
372 if (status->flag & RX_FLAG_SHORT_GI)
373 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
374 if (status->flag & RX_FLAG_40MHZ)
375 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 376 if (status->flag & RX_FLAG_HT_GF)
377 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
63c361f5
EG		 378 if (status->flag & RX_FLAG_LDPC)
379 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
786677d1
OR		 380 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
381 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 382 pos++;
383 *pos++ = status->rate_idx;
384 }
4c298677
JB		 385
386 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
387 u16 flags = 0;
388
389 /* ensure 4 byte alignment */
390 while ((pos - (u8 *)rthdr) & 3)
391 pos++;
392 rthdr->it_present |=
393 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
394 put_unaligned_le32(status->ampdu_reference, pos);
395 pos += 4;
4c298677
JB		 396 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
397 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
398 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
399 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
400 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
401 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
402 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
403 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
404 put_unaligned_le16(flags, pos);
405 pos += 2;
406 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
407 *pos++ = status->ampdu_delimiter_crc;
408 else
409 *pos++ = 0;
410 *pos++ = 0;
411 }
90b9e446 412
51648921
JB		 413 if (status->flag & RX_FLAG_VHT) {
414 u16 known = local->hw.radiotap_vht_details;
415
416 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 417 put_unaligned_le16(known, pos);
418 pos += 2;
419 /* flags */
420 if (status->flag & RX_FLAG_SHORT_GI)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 422 /* in VHT, STBC is binary */
423 if (status->flag & RX_FLAG_STBC_MASK)
424 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 425 if (status->vht_flag & RX_VHT_FLAG_BF)
426 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 427 pos++;
428 /* bandwidth */
1b8d242a 429 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 430 *pos++ = 4;
1b8d242a 431 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 432 *pos++ = 11;
433 else if (status->flag & RX_FLAG_40MHZ)
434 *pos++ = 1;
435 else /* 20 MHz */
436 *pos++ = 0;
437 /* MCS/NSS */
438 *pos = (status->rate_idx << 4) | status->vht_nss;
439 pos += 4;
440 /* coding field */
63c361f5
EG		 441 if (status->flag & RX_FLAG_LDPC)
442 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 443 pos++;
444 /* group ID */
445 pos++;
446 /* partial_aid */
447 pos += 2;
448 }
449
a144f378
JB		 450 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
451 *pos++ = status->chain_signal[chain];
452 *pos++ = chain;
453 }
1f7bba79
JB		 454
455 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
456 /* ensure 2 byte alignment for the vendor field as required */
457 if ((pos - (u8 *)rthdr) & 1)
458 *pos++ = 0;
459 *pos++ = rtap.oui[0];
460 *pos++ = rtap.oui[1];
461 *pos++ = rtap.oui[2];
462 *pos++ = rtap.subns;
463 put_unaligned_le16(rtap.len, pos);
464 pos += 2;
465 /* align the actual payload as requested */
466 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
467 *pos++ = 0;
468 /* data (and possible padding) already follows */
469 }
601ae7f2
BR		 470}
471
b2e7771e
JB		 472/*
473 * This function copies a received frame to all monitor interfaces and
474 * returns a cleaned-up SKB that no longer includes the FCS nor the
475 * radiotap header the driver might have added.
476 */
477static struct sk_buff *
478ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 479 struct ieee80211_rate *rate)
b2e7771e 480{
f1d58c25 481 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 482 struct ieee80211_sub_if_data *sdata;
1f7bba79 483 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 484 struct sk_buff *skb, *skb2;
485 struct net_device *prev_dev = NULL;
486 int present_fcs_len = 0;
1f7bba79
JB		 487 unsigned int rtap_vendor_space = 0;
488
489 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
490 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
491
492 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
493 }
b2e7771e
JB		 494
495 /*
496 * First, we may need to make a copy of the skb because
497 * (1) we need to modify it for radiotap (if not present), and
498 * (2) the other RX handlers will modify the skb we got.
499 *
500 * We don't need to, of course, if we aren't going to return
501 * the SKB because it has a bad FCS/PLCP checksum.
502 */
0869aea0 503
30686bf7 504 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
b2e7771e
JB		 505 present_fcs_len = FCS_LEN;
506
1f7bba79
JB		 507 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
508 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 509 dev_kfree_skb(origskb);
510 return NULL;
511 }
512
17883048 513 if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) {
1f7bba79
JB		 514 if (should_drop_frame(origskb, present_fcs_len,
515 rtap_vendor_space)) {
b2e7771e
JB		 516 dev_kfree_skb(origskb);
517 return NULL;
518 }
519
1f7bba79 520 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 521 }
522
751413ea 523 /* room for the radiotap header based on driver features */
1f7bba79
JB		 524 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
525 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 526
1f7bba79 527 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 528 /* only need to expand headroom if necessary */
529 skb = origskb;
530 origskb = NULL;
531
532 /*
533 * This shouldn't trigger often because most devices have an
534 * RX header they pull before we get here, and that should
535 * be big enough for our radiotap information. We should
536 * probably export the length to drivers so that we can have
537 * them allocate enough headroom to start with.
538 */
539 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 540 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 541 dev_kfree_skb(skb);
542 return NULL;
543 }
544 } else {
545 /*
546 * Need to make a copy and possibly remove radiotap header
547 * and FCS from the original.
548 */
549 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
550
1f7bba79
JB		 551 origskb = remove_monitor_info(local, origskb,
552 rtap_vendor_space);
b2e7771e
JB		 553
554 if (!skb)
555 return origskb;
556 }
557
0869aea0 558 /* prepend radiotap information */
1f7bba79 559 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 560
ce3edf6d 561 skb_reset_mac_header(skb);
b2e7771e
JB		 562 skb->ip_summed = CHECKSUM_UNNECESSARY;
563 skb->pkt_type = PACKET_OTHERHOST;
564 skb->protocol = htons(ETH_P_802_2);
565
566 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 567 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 568 continue;
569
3d30d949
MW		 570 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
571 continue;
572
9607e6b6 573 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 574 continue;
575
b2e7771e
JB		 576 if (prev_dev) {
577 skb2 = skb_clone(skb, GFP_ATOMIC);
578 if (skb2) {
579 skb2->dev = prev_dev;
5548a8a1 580 netif_receive_skb(skb2);
b2e7771e
JB		 581 }
582 }
583
584 prev_dev = sdata->dev;
5a490510 585 ieee80211_rx_stats(sdata->dev, skb->len);
b2e7771e
JB		 586 }
587
588 if (prev_dev) {
589 skb->dev = prev_dev;
5548a8a1 590 netif_receive_skb(skb);
b2e7771e
JB		 591 } else
592 dev_kfree_skb(skb);
593
594 return origskb;
595}
596
5cf121c3 597static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 598{
238f74a2 599 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 600 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 601 int tid, seqno_idx, security_idx;
6e0d114d
JB		 602
603 /* does the frame have a qos control field? */
238f74a2
HH		 604 if (ieee80211_is_data_qos(hdr->frame_control)) {
605 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 606 /* frame has qos control */
238f74a2 607 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 608 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 609 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 610
611 seqno_idx = tid;
612 security_idx = tid;
6e0d114d 613 } else {
1411f9b5
JB		 614 /*
615 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
616 *
617 * Sequence numbers for management frames, QoS data
618 * frames with a broadcast/multicast address in the
619 * Address 1 field, and all non-QoS data frames sent
620 * by QoS STAs are assigned using an additional single
621 * modulo-4096 counter, [...]
622 *
623 * We also use that counter for non-QoS STAs.
624 */
5a306f58 625 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 626 security_idx = 0;
627 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 628 security_idx = IEEE80211_NUM_TIDS;
9e26297a 629 tid = 0;
6e0d114d 630 }
52865dfd 631
9e26297a
JB		 632 rx->seqno_idx = seqno_idx;
633 rx->security_idx = security_idx;
6e0d114d
JB		 634 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
635 * For now, set skb->priority to 0 for other cases. */
636 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 637}
6e0d114d 638
d1c3a37c
JB		 639/**
640 * DOC: Packet alignment
641 *
642 * Drivers always need to pass packets that are aligned to two-byte boundaries
643 * to the stack.
644 *
645 * Additionally, should, if possible, align the payload data in a way that
646 * guarantees that the contained IP header is aligned to a four-byte
647 * boundary. In the case of regular frames, this simply means aligning the
648 * payload to a four-byte boundary (because either the IP header is directly
649 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 650 * in front of it). If the payload data is not properly aligned and the
651 * architecture doesn't support efficient unaligned operations, mac80211
652 * will align the data.
d1c3a37c
JB		 653 *
654 * With A-MSDU frames, however, the payload data address must yield two modulo
655 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
656 * push the IP header further back to a multiple of four again. Thankfully, the
657 * specs were sane enough this time around to require padding each A-MSDU
658 * subframe to a length that is a multiple of four.
659 *
25985edc 660 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 661 * the payload is not supported, the driver is required to move the 802.11
662 * header to be directly in front of the payload in that case.
663 */
664static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 665{
59d9cb07 666#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 667 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 668#endif
6e0d114d
JB		 669}
670
6368e4b1 671
571ecf67
JB		 672/* rx handlers */
673
3cfcf6ac
JM		 674static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
675{
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677
d8ca16db 678 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 679 return 0;
680
d8ca16db 681 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 682}
683
684
685static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
686{
687 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
688
d8ca16db 689 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 690 return 0;
691
d8ca16db 692 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 693}
694
695
696/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
697static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
698{
699 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
700 struct ieee80211_mmie *mmie;
56c52da2 701 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 702
1df332e8 703 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 704 return -1;
705
d8ca16db 706 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 707 return -1; /* not a robust management frame */
708
709 mmie = (struct ieee80211_mmie *)
710 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 711 if (mmie->element_id == WLAN_EID_MMIE &&
712 mmie->length == sizeof(*mmie) - 2)
713 return le16_to_cpu(mmie->key_id);
714
715 mmie16 = (struct ieee80211_mmie_16 *)
716 (skb->data + skb->len - sizeof(*mmie16));
717 if (skb->len >= 24 + sizeof(*mmie16) &&
718 mmie16->element_id == WLAN_EID_MMIE &&
719 mmie16->length == sizeof(*mmie16) - 2)
720 return le16_to_cpu(mmie16->key_id);
721
722 return -1;
3cfcf6ac
JM		 723}
724
2c61cf9c
JB		 725static int ieee80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
726 struct sk_buff *skb)
2475b1cc
MS		 727{
728 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
729 __le16 fc;
730 int hdrlen;
731 u8 keyid;
732
733 fc = hdr->frame_control;
734 hdrlen = ieee80211_hdrlen(fc);
735
736 if (skb->len < hdrlen + cs->hdr_len)
737 return -EINVAL;
738
739 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
740 keyid &= cs->key_idx_mask;
741 keyid >>= cs->key_idx_shift;
742
743 return keyid;
744}
745
1df332e8 746static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 747{
a7767f95 748 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 749 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 750
a7767f95 751 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 752 if (is_multicast_ether_addr(hdr->addr1)) {
753 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 754 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 755 return RX_DROP_MONITOR;
b203ca39 756 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 757 return RX_DROP_MONITOR;
758 } else {
759 if (!ieee80211_has_a4(hdr->frame_control))
760 return RX_DROP_MONITOR;
b203ca39 761 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 762 return RX_DROP_MONITOR;
763 }
33b64eb2
LCC		 764 }
765
766 /* If there is not an established peer link and this is not a peer link
767 * establisment frame, beacon or probe, drop the frame.
768 */
769
57cf8043 770 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 771 struct ieee80211_mgmt *mgmt;
d6d1a5a7 772
a7767f95 773 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 774 return RX_DROP_MONITOR;
775
a7767f95 776 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 777 u8 category;
9b395bc3
JB		 778
779 /* make sure category field is present */
780 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
781 return RX_DROP_MONITOR;
782
33b64eb2 783 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 784 category = mgmt->u.action.category;
785 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 786 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 787 return RX_DROP_MONITOR;
33b64eb2 788 return RX_CONTINUE;
33b64eb2
LCC		 789 }
790
a7767f95
HH		 791 if (ieee80211_is_probe_req(hdr->frame_control) ||
792 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 793 ieee80211_is_beacon(hdr->frame_control) ||
794 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 795 return RX_CONTINUE;
796
797 return RX_DROP_MONITOR;
a7767f95
HH		 798 }
799
902acc78
JB		 800 return RX_CONTINUE;
801}
33b64eb2 802
fb4ea054
JB		 803static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
804 int index)
805{
806 struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index];
807 struct sk_buff *tail = skb_peek_tail(frames);
808 struct ieee80211_rx_status *status;
809
06470f74
SS		 810 if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
811 return true;
812
fb4ea054
JB		 813 if (!tail)
814 return false;
815
816 status = IEEE80211_SKB_RXCB(tail);
817 if (status->flag & RX_FLAG_AMSDU_MORE)
818 return false;
819
820 return true;
821}
822
d3b2fb53 823static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 824 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 825 int index,
826 struct sk_buff_head *frames)
1edfb1af 827{
83eb935e
MK		 828 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
829 struct sk_buff *skb;
4cfda47b 830 struct ieee80211_rx_status *status;
1edfb1af 831
dd318575
JB		 832 lockdep_assert_held(&tid_agg_rx->reorder_lock);
833
83eb935e 834 if (skb_queue_empty(skb_list))
1edfb1af
JB		 835 goto no_frame;
836
fb4ea054 837 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
83eb935e
MK		 838 __skb_queue_purge(skb_list);
839 goto no_frame;
840 }
841
842 /* release frames from the reorder ring buffer */
1edfb1af 843 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 844 while ((skb = __skb_dequeue(skb_list))) {
845 status = IEEE80211_SKB_RXCB(skb);
846 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
847 __skb_queue_tail(frames, skb);
848 }
1edfb1af
JB		 849
850no_frame:
06470f74 851 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
9a886586 852 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 853}
854
d3b2fb53 855static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 856 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 857 u16 head_seq_num,
858 struct sk_buff_head *frames)
1edfb1af
JB		 859{
860 int index;
861
dd318575
JB		 862 lockdep_assert_held(&tid_agg_rx->reorder_lock);
863
9a886586 864 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 865 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 866 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
867 frames);
1edfb1af
JB		 868 }
869}
870
871/*
872 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
873 * the skb was added to the buffer longer than this time ago, the earlier
874 * frames that have not yet been received are assumed to be lost and the skb
875 * can be released for processing. This may also release other skb's from the
876 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 877 *
878 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 879 */
880#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
881
d3b2fb53 882static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 883 struct tid_ampdu_rx *tid_agg_rx,
884 struct sk_buff_head *frames)
aa0c8636 885{
83eb935e 886 int index, i, j;
aa0c8636 887
dd318575
JB		 888 lockdep_assert_held(&tid_agg_rx->reorder_lock);
889
aa0c8636 890 /* release the buffer until next missing frame */
2e3049b7 891 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
fb4ea054 892 if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) &&
07ae2dfc 893 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 894 /*
895 * No buffers ready to be released, but check whether any
896 * frames in the reorder buffer have timed out.
897 */
aa0c8636
CL		 898 int skipped = 1;
899 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
900 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 901 if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) {
aa0c8636
CL		 902 skipped++;
903 continue;
904 }
499fe9a4
DH		 905 if (skipped &&
906 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 907 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 908 goto set_release_timer;
aa0c8636 909
83eb935e
MK		 910 /* don't leave incomplete A-MSDUs around */
911 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
912 i = (i + 1) % tid_agg_rx->buf_size)
913 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
914
bdcbd8e0
JB		 915 ht_dbg_ratelimited(sdata,
916 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 917 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
918 frames);
aa0c8636
CL		 919
920 /*
921 * Increment the head seq# also for the skipped slots.
922 */
923 tid_agg_rx->head_seq_num =
9a886586
JB		 924 (tid_agg_rx->head_seq_num +
925 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 926 skipped = 0;
927 }
fb4ea054 928 } else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
f9e124fb
CL		 929 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
930 frames);
2e3049b7 931 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 932 }
2bff8ebf
CL		 933
934 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 935 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 936
937 for (; j != (index - 1) % tid_agg_rx->buf_size;
938 j = (j + 1) % tid_agg_rx->buf_size) {
fb4ea054 939 if (ieee80211_rx_reorder_ready(tid_agg_rx, j))
2bff8ebf
CL		 940 break;
941 }
942
943 set_release_timer:
944
788211d8
JB		 945 if (!tid_agg_rx->removed)
946 mod_timer(&tid_agg_rx->reorder_timer,
947 tid_agg_rx->reorder_time[j] + 1 +
948 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 949 } else {
950 del_timer(&tid_agg_rx->reorder_timer);
951 }
aa0c8636
CL		 952}
953
1edfb1af
JB		 954/*
955 * As this function belongs to the RX path it must be under
956 * rcu_read_lock protection. It returns false if the frame
957 * can be processed immediately, true if it was consumed.
958 */
d3b2fb53 959static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 960 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 961 struct sk_buff *skb,
962 struct sk_buff_head *frames)
1edfb1af
JB		 963{
964 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 965 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 966 u16 sc = le16_to_cpu(hdr->seq_ctrl);
967 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
968 u16 head_seq_num, buf_size;
969 int index;
2bff8ebf 970 bool ret = true;
1edfb1af 971
dd318575
JB		 972 spin_lock(&tid_agg_rx->reorder_lock);
973
4549cf2b
MK		 974 /*
975 * Offloaded BA sessions have no known starting sequence number so pick
976 * one from first Rxed frame for this tid after BA was started.
977 */
978 if (unlikely(tid_agg_rx->auto_seq)) {
979 tid_agg_rx->auto_seq = false;
980 tid_agg_rx->ssn = mpdu_seq_num;
981 tid_agg_rx->head_seq_num = mpdu_seq_num;
982 }
983
1edfb1af
JB		 984 buf_size = tid_agg_rx->buf_size;
985 head_seq_num = tid_agg_rx->head_seq_num;
986
987 /* frame with out of date sequence number */
9a886586 988 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 989 dev_kfree_skb(skb);
2bff8ebf 990 goto out;
1edfb1af
JB		 991 }
992
993 /*
994 * If frame the sequence number exceeds our buffering window
995 * size release some previous frames to make room for this one.
996 */
9a886586
JB		 997 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
998 head_seq_num = ieee80211_sn_inc(
999 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 1000 /* release stored frames up to new head to stack */
d3b2fb53 1001 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 1002 head_seq_num, frames);
1edfb1af
JB		 1003 }
1004
1005 /* Now the new frame is always in the range of the reordering buffer */
1006
2e3049b7 1007 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 1008
1009 /* check if we already stored this frame */
fb4ea054 1010 if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) {
1edfb1af 1011 dev_kfree_skb(skb);
2bff8ebf 1012 goto out;
1edfb1af
JB		 1013 }
1014
1015 /*
1016 * If the current MPDU is in the right order and nothing else
1017 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 1018 * If it is first but there's something stored, we may be able
1019 * to release frames after this one.
1edfb1af
JB		 1020 */
1021 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1022 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1023 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1024 tid_agg_rx->head_seq_num =
1025 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1026 ret = false;
1027 goto out;
1edfb1af
JB		 1028 }
1029
1030 /* put the frame in the reordering buffer */
83eb935e
MK		 1031 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1032 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1033 tid_agg_rx->reorder_time[index] = jiffies;
1034 tid_agg_rx->stored_mpdu_num++;
1035 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1036 }
1edfb1af 1037
2bff8ebf
CL		 1038 out:
1039 spin_unlock(&tid_agg_rx->reorder_lock);
1040 return ret;
1edfb1af
JB		 1041}
1042
1043/*
1044 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1045 * true if the MPDU was buffered, false if it should be processed.
1046 */
f9e124fb
CL		 1047static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1048 struct sk_buff_head *frames)
1edfb1af 1049{
2569a826
JB		 1050 struct sk_buff *skb = rx->skb;
1051 struct ieee80211_local *local = rx->local;
1edfb1af 1052 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1053 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1054 struct tid_ampdu_rx *tid_agg_rx;
1055 u16 sc;
6cc00d54 1056 u8 tid, ack_policy;
1edfb1af 1057
051a41fa
JB		 1058 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1059 is_multicast_ether_addr(hdr->addr1))
2569a826 1060 goto dont_reorder;
1edfb1af
JB		 1061
1062 /*
1063 * filter the QoS data rx stream according to
1064 * STA/TID and check if this STA/TID is on aggregation
1065 */
1066
1edfb1af 1067 if (!sta)
2569a826 1068 goto dont_reorder;
1edfb1af 1069
6cc00d54
TP		 1070 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1071 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1072 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1073
a87f736d
JB		 1074 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1075 if (!tid_agg_rx)
1076 goto dont_reorder;
1edfb1af
JB		 1077
1078 /* qos null data frames are excluded */
1079 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1080 goto dont_reorder;
1edfb1af 1081
6cc00d54
TP		 1082 /* not part of a BA session */
1083 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1084 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1085 goto dont_reorder;
1086
1edfb1af
JB		 1087 /* new, potentially un-ordered, ampdu frame - process it */
1088
1089 /* reset session timer */
1090 if (tid_agg_rx->timeout)
12d3952f 1091 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1092
1093 /* if this mpdu is fragmented - terminate rx aggregation session */
1094 sc = le16_to_cpu(hdr->seq_ctrl);
1095 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1096 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1097 skb_queue_tail(&rx->sdata->skb_queue, skb);
1098 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1099 return;
1edfb1af
JB		 1100 }
1101
a87f736d
JB		 1102 /*
1103 * No locking needed -- we will only ever process one
1104 * RX packet at a time, and thus own tid_agg_rx. All
1105 * other code manipulating it needs to (and does) make
1106 * sure that we cannot get to it any more before doing
1107 * anything with it.
1108 */
f9e124fb
CL		 1109 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1110 frames))
2569a826
JB		 1111 return;
1112
1113 dont_reorder:
f9e124fb 1114 __skb_queue_tail(frames, skb);
1edfb1af 1115}
33b64eb2 1116
49461622 1117static ieee80211_rx_result debug_noinline
0395442a 1118ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1119{
a7767f95 1120 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1121 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1122
f9cfa5f3
SS		 1123 if (status->flag & RX_FLAG_DUP_VALIDATED)
1124 return RX_CONTINUE;
1125
6b0f3274
JB		 1126 /*
1127 * Drop duplicate 802.11 retransmissions
1128 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1129 */
0395442a
JB		 1130
1131 if (rx->skb->len < 24)
1132 return RX_CONTINUE;
1133
1134 if (ieee80211_is_ctl(hdr->frame_control) ||
1135 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1136 is_multicast_ether_addr(hdr->addr1))
1137 return RX_CONTINUE;
1138
a732fa70
JB		 1139 if (!rx->sta)
1140 return RX_CONTINUE;
1141
1142 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1143 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1144 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1145 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1146 return RX_DROP_UNUSABLE;
1147 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1148 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1149 }
1150
0395442a
JB		 1151 return RX_CONTINUE;
1152}
1153
1154static ieee80211_rx_result debug_noinline
1155ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1156{
1157 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1158
571ecf67
JB		 1159 /* Drop disallowed frame classes based on STA auth/assoc state;
1160 * IEEE 802.11, Chap 5.5.
1161 *
ccd7b362
JB		 1162 * mac80211 filters only based on association state, i.e. it drops
1163 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1164 * deauth/disassoc frames when needed. In addition, hostapd is
1165 * responsible for filtering on both auth and assoc states.
1166 */
33b64eb2 1167
902acc78 1168 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1169 return ieee80211_rx_mesh_check(rx);
33b64eb2 1170
a7767f95
HH		 1171 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1172 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1173 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1174 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1175 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1176 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1177 /*
1178 * accept port control frames from the AP even when it's not
1179 * yet marked ASSOC to prevent a race where we don't set the
1180 * assoc bit quickly enough before it sends the first frame
1181 */
1182 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1183 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1184 unsigned int hdrlen;
1185 __be16 ethertype;
1186
1187 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1188
1189 if (rx->skb->len < hdrlen + 8)
1190 return RX_DROP_MONITOR;
1191
1192 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1193 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1194 return RX_CONTINUE;
1195 }
21fc7560
JB		 1196
1197 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1198 cfg80211_rx_spurious_frame(rx->sdata->dev,
1199 hdr->addr2,
1200 GFP_ATOMIC))
1201 return RX_DROP_UNUSABLE;
1202
e4c26add 1203 return RX_DROP_MONITOR;
2a33bee2 1204 }
571ecf67 1205
9ae54c84 1206 return RX_CONTINUE;
570bd537
JB		 1207}
1208
1209
572e0012
KV		 1210static ieee80211_rx_result debug_noinline
1211ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1212{
1213 struct ieee80211_local *local;
1214 struct ieee80211_hdr *hdr;
1215 struct sk_buff *skb;
1216
1217 local = rx->local;
1218 skb = rx->skb;
1219 hdr = (struct ieee80211_hdr *) skb->data;
1220
1221 if (!local->pspolling)
1222 return RX_CONTINUE;
1223
1224 if (!ieee80211_has_fromds(hdr->frame_control))
1225 /* this is not from AP */
1226 return RX_CONTINUE;
1227
1228 if (!ieee80211_is_data(hdr->frame_control))
1229 return RX_CONTINUE;
1230
1231 if (!ieee80211_has_moredata(hdr->frame_control)) {
1232 /* AP has no more frames buffered for us */
1233 local->pspolling = false;
1234 return RX_CONTINUE;
1235 }
1236
1237 /* more data bit is set, let's request a new frame from the AP */
1238 ieee80211_send_pspoll(local, rx->sdata);
1239
1240 return RX_CONTINUE;
1241}
1242
d012a605 1243static void sta_ps_start(struct sta_info *sta)
571ecf67 1244{
133b8226 1245 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1246 struct ieee80211_local *local = sdata->local;
d012a605 1247 struct ps_data *ps;
ba8c3d6f 1248 int tid;
0795af57 1249
d012a605
MP		 1250 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1251 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1252 ps = &sdata->bss->ps;
1253 else
1254 return;
1255
1256 atomic_inc(&ps->num_sta_ps);
c2c98fde 1257 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1258 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1259 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1260 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1261 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1262
17c18bf8
JB		 1263 ieee80211_clear_fast_xmit(sta);
1264
ba8c3d6f
FF		 1265 if (!sta->sta.txq[0])
1266 return;
1267
1268 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1269 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1270
4e3f21bc 1271 if (txqi->tin.backlog_packets)
ba8c3d6f
FF		 1272 set_bit(tid, &sta->txq_buffered_tids);
1273 else
1274 clear_bit(tid, &sta->txq_buffered_tids);
1275 }
571ecf67
JB		 1276}
1277
d012a605 1278static void sta_ps_end(struct sta_info *sta)
571ecf67 1279{
bdcbd8e0
JB		 1280 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1281 sta->sta.addr, sta->sta.aid);
004c872e 1282
c2c98fde 1283 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1284 /*
1285 * Clear the flag only if the other one is still set
1286 * so that the TX path won't start TX'ing new frames
1287 * directly ... In the case that the driver flag isn't
1288 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1289 */
1290 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1291 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1292 sta->sta.addr, sta->sta.aid);
af818581
JB		 1293 return;
1294 }
1295
5ac2e350
JB		 1296 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1297 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1298 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1299}
1300
cf47161a 1301int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1302{
cf47161a 1303 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1304 bool in_ps;
1305
cf47161a 1306 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1307
1308 /* Don't let the same PS state be set twice */
cf47161a 1309 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1310 if ((start && in_ps) || (!start && !in_ps))
1311 return -EINVAL;
1312
1313 if (start)
cf47161a 1314 sta_ps_start(sta);
d057e5a3 1315 else
cf47161a 1316 sta_ps_end(sta);
d057e5a3
AN		 1317
1318 return 0;
1319}
1320EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1321
46fa38e8
JB		 1322void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
1323{
1324 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1325
1326 if (test_sta_flag(sta, WLAN_STA_SP))
1327 return;
1328
1329 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1330 ieee80211_sta_ps_deliver_poll_response(sta);
1331 else
1332 set_sta_flag(sta, WLAN_STA_PSPOLL);
1333}
1334EXPORT_SYMBOL(ieee80211_sta_pspoll);
1335
1336void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
1337{
1338 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1339 u8 ac = ieee802_1d_to_ac[tid & 7];
1340
1341 /*
1342 * If this AC is not trigger-enabled do nothing.
1343 *
1344 * NB: This could/should check a separate bitmap of trigger-
1345 * enabled queues, but for now we only implement uAPSD w/o
1346 * TSPEC changes to the ACs, so they're always the same.
1347 */
1348 if (!(sta->sta.uapsd_queues & BIT(ac)))
1349 return;
1350
1351 /* if we are in a service period, do nothing */
1352 if (test_sta_flag(sta, WLAN_STA_SP))
1353 return;
1354
1355 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1356 ieee80211_sta_ps_deliver_uapsd(sta);
1357 else
1358 set_sta_flag(sta, WLAN_STA_UAPSD);
1359}
1360EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
1361
47086fc5
JB		 1362static ieee80211_rx_result debug_noinline
1363ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1364{
1365 struct ieee80211_sub_if_data *sdata = rx->sdata;
1366 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1367 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
47086fc5 1368
5c90067c 1369 if (!rx->sta)
47086fc5
JB		 1370 return RX_CONTINUE;
1371
1372 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1373 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1374 return RX_CONTINUE;
1375
1376 /*
1377 * The device handles station powersave, so don't do anything about
1378 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1379 * it to mac80211 since they're handled.)
1380 */
30686bf7 1381 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1382 return RX_CONTINUE;
1383
1384 /*
1385 * Don't do anything if the station isn't already asleep. In
1386 * the uAPSD case, the station will probably be marked asleep,
1387 * in the PS-Poll case the station must be confused ...
1388 */
c2c98fde 1389 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1390 return RX_CONTINUE;
1391
1392 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
46fa38e8 1393 ieee80211_sta_pspoll(&rx->sta->sta);
47086fc5
JB		 1394
1395 /* Free PS Poll skb here instead of returning RX_DROP that would
1396 * count as an dropped frame. */
1397 dev_kfree_skb(rx->skb);
1398
1399 return RX_QUEUED;
1400 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1401 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1402 ieee80211_has_pm(hdr->frame_control) &&
1403 (ieee80211_is_data_qos(hdr->frame_control) ||
1404 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
46fa38e8 1405 u8 tid;
47086fc5 1406
46fa38e8 1407 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
47086fc5 1408
46fa38e8 1409 ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
47086fc5
JB		 1410 }
1411
1412 return RX_CONTINUE;
1413}
1414
49461622 1415static ieee80211_rx_result debug_noinline
5cf121c3 1416ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1417{
1418 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1419 struct sk_buff *skb = rx->skb;
1420 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1421 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1422 int i;
571ecf67
JB		 1423
1424 if (!sta)
9ae54c84 1425 return RX_CONTINUE;
571ecf67 1426
b291ba11
JB		 1427 /*
1428 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1429 * BSSID and for station already AUTHORIZED to avoid keeping the
1430 * current IBSS network alive in cases where other STAs start
1431 * using different BSSID. This will also give the station another
1432 * chance to restart the authentication/authorization in case
1433 * something went wrong the first time.
b291ba11 1434 */
05c914fe 1435 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1436 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1437 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1438 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1439 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1440 sta->rx_stats.last_rx = jiffies;
f4ebddf9 1441 if (ieee80211_is_data(hdr->frame_control) &&
4f6b1b3d
JB		 1442 !is_multicast_ether_addr(hdr->addr1))
1443 sta->rx_stats.last_rate =
1444 sta_stats_encode_rate(status);
3af6334c 1445 }
239281f8 1446 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1447 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1448 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1449 /*
33b64eb2
LCC		 1450 * Mesh beacons will update last_rx when if they are found to
1451 * match the current local configuration when processed.
571ecf67 1452 */
e5a9f8d0 1453 sta->rx_stats.last_rx = jiffies;
4f6b1b3d
JB		 1454 if (ieee80211_is_data(hdr->frame_control))
1455 sta->rx_stats.last_rate = sta_stats_encode_rate(status);
571ecf67
JB		 1456 }
1457
3cf335d5
KV		 1458 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1459 ieee80211_sta_rx_notify(rx->sdata, hdr);
1460
e5a9f8d0 1461 sta->rx_stats.fragments++;
0f9c5a61
JB		 1462
1463 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
e5a9f8d0 1464 sta->rx_stats.bytes += rx->skb->len;
0f9c5a61
JB		 1465 u64_stats_update_end(&rx->sta->rx_stats.syncp);
1466
fe8431f8 1467 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0 1468 sta->rx_stats.last_signal = status->signal;
0be6ed13 1469 ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal);
fe8431f8 1470 }
571ecf67 1471
ef0621e8 1472 if (status->chains) {
e5a9f8d0 1473 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1474 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1475 int signal = status->chain_signal[i];
1476
1477 if (!(status->chains & BIT(i)))
1478 continue;
1479
e5a9f8d0 1480 sta->rx_stats.chain_signal_last[i] = signal;
0be6ed13 1481 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
e5a9f8d0 1482 -signal);
ef0621e8
FF		 1483 }
1484 }
1485
72eaa43a
JB		 1486 /*
1487 * Change STA power saving mode only at the end of a frame
1488 * exchange sequence.
1489 */
30686bf7 1490 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1491 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1492 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1493 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1494 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1495 /* PM bit is only checked in frames where it isn't reserved,
1496 * in AP mode it's reserved in non-bufferable management frames
1497 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1498 */
1499 (!ieee80211_is_mgmt(hdr->frame_control) ||
1500 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1501 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1502 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1503 sta_ps_end(sta);
72eaa43a
JB		 1504 } else {
1505 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1506 sta_ps_start(sta);
72eaa43a 1507 }
571ecf67
JB		 1508 }
1509
3f52b7e3
MP		 1510 /* mesh power save support */
1511 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1512 ieee80211_mps_rx_h_sta_process(sta, hdr);
1513
22403def
JB		 1514 /*
1515 * Drop (qos-)data::nullfunc frames silently, since they
1516 * are used only to control station power saving mode.
1517 */
1518 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1519 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1520 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1521
1522 /*
1523 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1524 * that was not moved to a 4-addr STA vlan yet send
1525 * the event to userspace and for older hostapd drop
1526 * the frame to the monitor interface.
d524215f
FF		 1527 */
1528 if (ieee80211_has_a4(hdr->frame_control) &&
1529 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1530 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1531 !rx->sdata->u.vlan.sta))) {
1532 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1533 cfg80211_rx_unexpected_4addr_frame(
1534 rx->sdata->dev, sta->sta.addr,
1535 GFP_ATOMIC);
d524215f 1536 return RX_DROP_MONITOR;
e7f4a940 1537 }
22403def
JB		 1538 /*
1539 * Update counter and free packet here to avoid
1540 * counting this as a dropped packed.
1541 */
e5a9f8d0 1542 sta->rx_stats.packets++;
571ecf67 1543 dev_kfree_skb(rx->skb);
9ae54c84 1544 return RX_QUEUED;
571ecf67
JB		 1545 }
1546
9ae54c84 1547 return RX_CONTINUE;
571ecf67
JB		 1548} /* ieee80211_rx_h_sta_process */
1549
86c228a7
JA		 1550static ieee80211_rx_result debug_noinline
1551ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1552{
1553 struct sk_buff *skb = rx->skb;
1554 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1555 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1556 int keyidx;
1557 int hdrlen;
1558 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1559 struct ieee80211_key *sta_ptk = NULL;
1560 int mmie_keyidx = -1;
1561 __le16 fc;
2475b1cc 1562 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1563
1564 /*
1565 * Key selection 101
1566 *
1567 * There are four types of keys:
1568 * - GTK (group keys)
1569 * - IGTK (group keys for management frames)
1570 * - PTK (pairwise keys)
1571 * - STK (station-to-station pairwise keys)
1572 *
1573 * When selecting a key, we have to distinguish between multicast
1574 * (including broadcast) and unicast frames, the latter can only
1575 * use PTKs and STKs while the former always use GTKs and IGTKs.
1576 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1577 * unicast frames can also use key indices like GTKs. Hence, if we
1578 * don't have a PTK/STK we check the key index for a WEP key.
1579 *
1580 * Note that in a regular BSS, multicast frames are sent by the
1581 * AP only, associated stations unicast the frame to the AP first
1582 * which then multicasts it on their behalf.
1583 *
1584 * There is also a slight problem in IBSS mode: GTKs are negotiated
1585 * with each station, that is something we don't currently handle.
1586 * The spec seems to expect that one negotiates the same key with
1587 * every station but there's no such requirement; VLANs could be
1588 * possible.
1589 */
1590
86c228a7
JA		 1591 /* start without a key */
1592 rx->key = NULL;
2475b1cc 1593 fc = hdr->frame_control;
86c228a7 1594
2475b1cc
MS		 1595 if (rx->sta) {
1596 int keyid = rx->sta->ptk_idx;
86c228a7 1597
2475b1cc
MS		 1598 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1599 cs = rx->sta->cipher_scheme;
2c61cf9c 1600 keyid = ieee80211_get_cs_keyid(cs, rx->skb);
2475b1cc
MS		 1601 if (unlikely(keyid < 0))
1602 return RX_DROP_UNUSABLE;
1603 }
1604 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1605 }
86c228a7
JA		 1606
1607 if (!ieee80211_has_protected(fc))
1608 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1609
1610 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1611 rx->key = sta_ptk;
1612 if ((status->flag & RX_FLAG_DECRYPTED) &&
1613 (status->flag & RX_FLAG_IV_STRIPPED))
1614 return RX_CONTINUE;
1615 /* Skip decryption if the frame is not protected. */
1616 if (!ieee80211_has_protected(fc))
1617 return RX_CONTINUE;
1618 } else if (mmie_keyidx >= 0) {
1619 /* Broadcast/multicast robust management frame / BIP */
1620 if ((status->flag & RX_FLAG_DECRYPTED) &&
1621 (status->flag & RX_FLAG_IV_STRIPPED))
1622 return RX_CONTINUE;
1623
1624 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1625 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1626 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
46f6b060
MH		 1627 if (rx->sta) {
1628 if (ieee80211_is_group_privacy_action(skb) &&
1629 test_sta_flag(rx->sta, WLAN_STA_MFP))
1630 return RX_DROP_MONITOR;
1631
86c228a7 1632 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
46f6b060 1633 }
86c228a7
JA		 1634 if (!rx->key)
1635 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1636 } else if (!ieee80211_has_protected(fc)) {
1637 /*
1638 * The frame was not protected, so skip decryption. However, we
1639 * need to set rx->key if there is a key that could have been
1640 * used so that the frame may be dropped if encryption would
1641 * have been expected.
1642 */
1643 struct ieee80211_key *key = NULL;
1644 struct ieee80211_sub_if_data *sdata = rx->sdata;
1645 int i;
1646
1647 if (ieee80211_is_mgmt(fc) &&
1648 is_multicast_ether_addr(hdr->addr1) &&
1649 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1650 rx->key = key;
1651 else {
1652 if (rx->sta) {
1653 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1654 key = rcu_dereference(rx->sta->gtk[i]);
1655 if (key)
1656 break;
1657 }
1658 }
1659 if (!key) {
1660 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1661 key = rcu_dereference(sdata->keys[i]);
1662 if (key)
1663 break;
1664 }
1665 }
1666 if (key)
1667 rx->key = key;
1668 }
1669 return RX_CONTINUE;
1670 } else {
1671 u8 keyid;
2475b1cc 1672
86c228a7
JA		 1673 /*
1674 * The device doesn't give us the IV so we won't be
1675 * able to look up the key. That's ok though, we
1676 * don't need to decrypt the frame, we just won't
1677 * be able to keep statistics accurate.
1678 * Except for key threshold notifications, should
1679 * we somehow allow the driver to tell us which key
1680 * the hardware used if this flag is set?
1681 */
1682 if ((status->flag & RX_FLAG_DECRYPTED) &&
1683 (status->flag & RX_FLAG_IV_STRIPPED))
1684 return RX_CONTINUE;
1685
1686 hdrlen = ieee80211_hdrlen(fc);
1687
2475b1cc 1688 if (cs) {
2c61cf9c 1689 keyidx = ieee80211_get_cs_keyid(cs, rx->skb);
86c228a7 1690
2475b1cc
MS		 1691 if (unlikely(keyidx < 0))
1692 return RX_DROP_UNUSABLE;
1693 } else {
1694 if (rx->skb->len < 8 + hdrlen)
1695 return RX_DROP_UNUSABLE; /* TODO: count this? */
1696 /*
1697 * no need to call ieee80211_wep_get_keyidx,
1698 * it verifies a bunch of things we've done already
1699 */
1700 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1701 keyidx = keyid >> 6;
1702 }
86c228a7
JA		 1703
1704 /* check per-station GTK first, if multicast packet */
1705 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1706 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1707
1708 /* if not found, try default key */
1709 if (!rx->key) {
1710 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1711
1712 /*
1713 * RSNA-protected unicast frames should always be
1714 * sent with pairwise or station-to-station keys,
1715 * but for WEP we allow using a key index as well.
1716 */
1717 if (rx->key &&
1718 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1719 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1720 !is_multicast_ether_addr(hdr->addr1))
1721 rx->key = NULL;
1722 }
1723 }
1724
1725 if (rx->key) {
1726 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1727 return RX_DROP_MONITOR;
1728
86c228a7
JA		 1729 /* TODO: add threshold stuff again */
1730 } else {
1731 return RX_DROP_MONITOR;
1732 }
1733
1734 switch (rx->key->conf.cipher) {
1735 case WLAN_CIPHER_SUITE_WEP40:
1736 case WLAN_CIPHER_SUITE_WEP104:
1737 result = ieee80211_crypto_wep_decrypt(rx);
1738 break;
1739 case WLAN_CIPHER_SUITE_TKIP:
1740 result = ieee80211_crypto_tkip_decrypt(rx);
1741 break;
1742 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1743 result = ieee80211_crypto_ccmp_decrypt(
1744 rx, IEEE80211_CCMP_MIC_LEN);
1745 break;
1746 case WLAN_CIPHER_SUITE_CCMP_256:
1747 result = ieee80211_crypto_ccmp_decrypt(
1748 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1749 break;
1750 case WLAN_CIPHER_SUITE_AES_CMAC:
1751 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1752 break;
56c52da2
JM		 1753 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1754 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1755 break;
8ade538b
JM		 1756 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1757 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1758 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1759 break;
00b9cfa3
JM		 1760 case WLAN_CIPHER_SUITE_GCMP:
1761 case WLAN_CIPHER_SUITE_GCMP_256:
1762 result = ieee80211_crypto_gcmp_decrypt(rx);
1763 break;
86c228a7 1764 default:
2475b1cc 1765 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1766 }
1767
1768 /* the hdr variable is invalid after the decrypt handlers */
1769
1770 /* either the frame has been decrypted or will be dropped */
1771 status->flag |= RX_FLAG_DECRYPTED;
1772
1773 return result;
1774}
1775
571ecf67
JB		 1776static inline struct ieee80211_fragment_entry *
1777ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1778 unsigned int frag, unsigned int seq, int rx_queue,
1779 struct sk_buff **skb)
1780{
1781 struct ieee80211_fragment_entry *entry;
571ecf67 1782
571ecf67
JB		 1783 entry = &sdata->fragments[sdata->fragment_next++];
1784 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1785 sdata->fragment_next = 0;
1786
bdcbd8e0 1787 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1788 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1789
1790 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1791 *skb = NULL;
1792 entry->first_frag_time = jiffies;
1793 entry->seq = seq;
1794 entry->rx_queue = rx_queue;
1795 entry->last_frag = frag;
9acc54be 1796 entry->check_sequential_pn = false;
571ecf67
JB		 1797 entry->extra_len = 0;
1798
1799 return entry;
1800}
1801
1802static inline struct ieee80211_fragment_entry *
1803ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1804 unsigned int frag, unsigned int seq,
571ecf67
JB		 1805 int rx_queue, struct ieee80211_hdr *hdr)
1806{
1807 struct ieee80211_fragment_entry *entry;
1808 int i, idx;
1809
1810 idx = sdata->fragment_next;
1811 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1812 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1813
1814 idx--;
1815 if (idx < 0)
1816 idx = IEEE80211_FRAGMENT_MAX - 1;
1817
1818 entry = &sdata->fragments[idx];
1819 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1820 entry->rx_queue != rx_queue ||
1821 entry->last_frag + 1 != frag)
1822 continue;
1823
b73d70ad 1824 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1825
b73d70ad
HH		 1826 /*
1827 * Check ftype and addresses are equal, else check next fragment
1828 */
1829 if (((hdr->frame_control ^ f_hdr->frame_control) &
1830 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1831 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1832 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1833 continue;
1834
ab46623e 1835 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1836 __skb_queue_purge(&entry->skb_list);
1837 continue;
1838 }
1839 return entry;
1840 }
1841
1842 return NULL;
1843}
1844
49461622 1845static ieee80211_rx_result debug_noinline
5cf121c3 1846ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1847{
1848 struct ieee80211_hdr *hdr;
1849 u16 sc;
358c8d9d 1850 __le16 fc;
571ecf67
JB		 1851 unsigned int frag, seq;
1852 struct ieee80211_fragment_entry *entry;
1853 struct sk_buff *skb;
554891e6 1854 struct ieee80211_rx_status *status;
571ecf67 1855
b73d70ad 1856 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1857 fc = hdr->frame_control;
f7fbf70e
JC		 1858
1859 if (ieee80211_is_ctl(fc))
1860 return RX_CONTINUE;
1861
571ecf67
JB		 1862 sc = le16_to_cpu(hdr->seq_ctrl);
1863 frag = sc & IEEE80211_SCTL_FRAG;
1864
b8fff407 1865 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 1866 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 1867 goto out_no_led;
571ecf67 1868 }
b8fff407 1869
d025933e
AM		 1870 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1871 goto out;
1872
571ecf67
JB		 1873 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1874
e3cf8b3f
ZY		 1875 if (skb_linearize(rx->skb))
1876 return RX_DROP_UNUSABLE;
1877
058897a4
AK		 1878 /*
1879 * skb_linearize() might change the skb->data and
1880 * previously cached variables (in this case, hdr) need to
1881 * be refreshed with the new data.
1882 */
1883 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1884 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1885
1886 if (frag == 0) {
1887 /* This is the first fragment of a new frame. */
1888 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1889 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 1890 if (rx->key &&
1891 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
9acc54be
JB		 1892 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1893 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1894 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
358c8d9d 1895 ieee80211_has_protected(fc)) {
9e26297a 1896 int queue = rx->security_idx;
9acc54be
JB		 1897
1898 /* Store CCMP/GCMP PN so that we can verify that the
1899 * next fragment has a sequential PN value.
1900 */
1901 entry->check_sequential_pn = true;
571ecf67 1902 memcpy(entry->last_pn,
9190252c 1903 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1904 IEEE80211_CCMP_PN_LEN);
9acc54be
JB		 1905 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1906 u.ccmp.rx_pn) !=
1907 offsetof(struct ieee80211_key,
1908 u.gcmp.rx_pn));
1909 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1910 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1911 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1912 IEEE80211_GCMP_PN_LEN);
571ecf67 1913 }
9ae54c84 1914 return RX_QUEUED;
571ecf67
JB		 1915 }
1916
1917 /* This is a fragment for a frame that should already be pending in
1918 * fragment cache. Add this fragment to the end of the pending entry.
1919 */
9e26297a
JB		 1920 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1921 rx->seqno_idx, hdr);
571ecf67
JB		 1922 if (!entry) {
1923 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1924 return RX_DROP_MONITOR;
571ecf67
JB		 1925 }
1926
9acc54be
JB		 1927 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1928 * MPDU PN values are not incrementing in steps of 1."
1929 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1930 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1931 */
1932 if (entry->check_sequential_pn) {
571ecf67 1933 int i;
4325f6ca 1934 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1935 int queue;
9acc54be 1936
2b2ba0db
JM		 1937 if (!rx->key ||
1938 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
9acc54be
JB		 1939 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1940 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1941 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
e4c26add 1942 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1943 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1944 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1945 pn[i]++;
1946 if (pn[i])
1947 break;
1948 }
9e26297a 1949 queue = rx->security_idx;
9190252c 1950 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1951 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1952 return RX_DROP_UNUSABLE;
4325f6ca 1953 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1954 }
1955
358c8d9d 1956 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1957 __skb_queue_tail(&entry->skb_list, rx->skb);
1958 entry->last_frag = frag;
1959 entry->extra_len += rx->skb->len;
358c8d9d 1960 if (ieee80211_has_morefrags(fc)) {
571ecf67 1961 rx->skb = NULL;
9ae54c84 1962 return RX_QUEUED;
571ecf67
JB		 1963 }
1964
1965 rx->skb = __skb_dequeue(&entry->skb_list);
1966 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 1967 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 1968 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1969 GFP_ATOMIC))) {
1970 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1971 __skb_queue_purge(&entry->skb_list);
e4c26add 1972 return RX_DROP_UNUSABLE;
571ecf67
JB		 1973 }
1974 }
1975 while ((skb = __skb_dequeue(&entry->skb_list))) {
1976 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1977 dev_kfree_skb(skb);
1978 }
1979
1980 /* Complete frame has been reassembled - process it now */
554891e6 1981 status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 1982
1983 out:
d025933e
AM		 1984 ieee80211_led_rx(rx->local);
1985 out_no_led:
571ecf67 1986 if (rx->sta)
e5a9f8d0 1987 rx->sta->rx_stats.packets++;
9ae54c84 1988 return RX_CONTINUE;
571ecf67
JB		 1989}
1990
1df332e8 1991static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1992{
1df332e8 1993 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1994 return -EACCES;
571ecf67 1995
76ee65bf 1996 return 0;
571ecf67
JB		 1997}
1998
1df332e8 1999static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 2000{
eb9fb5b8
JB		 2001 struct sk_buff *skb = rx->skb;
2002 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2003
3017b80b 2004 /*
7848ba7d
JB		 2005 * Pass through unencrypted frames if the hardware has
2006 * decrypted them already.
3017b80b 2007 */
eb9fb5b8 2008 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 2009 return 0;
571ecf67
JB		 2010
2011 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 2012 if (unlikely(!ieee80211_has_protected(fc) &&
2013 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 2014 ieee80211_is_data(fc) && rx->key))
76ee65bf 2015 return -EACCES;
bef5d1c7
JB		 2016
2017 return 0;
2018}
2019
1df332e8 2020static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 2021{
2022 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 2023 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 2024 __le16 fc = hdr->frame_control;
bef5d1c7 2025
e3efca0a
JM		 2026 /*
2027 * Pass through unencrypted frames if the hardware has
2028 * decrypted them already.
2029 */
2030 if (status->flag & RX_FLAG_DECRYPTED)
2031 return 0;
bef5d1c7 2032
c2c98fde 2033 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 2034 if (unlikely(!ieee80211_has_protected(fc) &&
2035 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2036 rx->key)) {
6ff57cf8
JB		 2037 if (ieee80211_is_deauth(fc) ||
2038 ieee80211_is_disassoc(fc))
2039 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2040 rx->skb->data,
2041 rx->skb->len);
f2ca3ea4 2042 return -EACCES;
cf4e594e 2043 }
f2ca3ea4 2044 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2045 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2046 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2047 if (ieee80211_is_deauth(fc) ||
2048 ieee80211_is_disassoc(fc))
2049 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2050 rx->skb->data,
2051 rx->skb->len);
f2ca3ea4 2052 return -EACCES;
cf4e594e 2053 }
f2ca3ea4
JM		 2054 /*
2055 * When using MFP, Action frames are not allowed prior to
2056 * having configured keys.
2057 */
2058 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2059 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2060 return -EACCES;
2061 }
b3fc9c6c 2062
76ee65bf 2063 return 0;
571ecf67
JB		 2064}
2065
76ee65bf 2066static int
4114fa21 2067__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2068{
eb9fb5b8 2069 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2070 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2071 bool check_port_control = false;
2072 struct ethhdr *ehdr;
2073 int ret;
f14543ee 2074
4114fa21 2075 *port_control = false;
9bc383de
JB		 2076 if (ieee80211_has_a4(hdr->frame_control) &&
2077 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2078 return -1;
9bc383de 2079
fbb327c5
FF		 2080 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2081 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2082
2083 if (!sdata->u.mgd.use_4addr)
2084 return -1;
2085 else
2086 check_port_control = true;
2087 }
2088
9bc383de 2089 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2090 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2091 return -1;
571ecf67 2092
fbb327c5 2093 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2094 if (ret < 0)
fbb327c5
FF		 2095 return ret;
2096
2097 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2098 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2099 *port_control = true;
2100 else if (check_port_control)
fbb327c5
FF		 2101 return -1;
2102
2103 return 0;
76ee65bf 2104}
571ecf67 2105
ce3edf6d
JB		 2106/*
2107 * requires that rx->skb is a frame with ethernet header
2108 */
358c8d9d 2109static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2110{
c97c23e3 2111 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2112 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2113 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2114
2115 /*
2116 * Allow EAPOL frames to us/the PAE group address regardless
2117 * of whether the frame was encrypted or not.
2118 */
a621fa4d 2119 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2120 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2121 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2122 return true;
2123
2124 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2125 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2126 return false;
2127
2128 return true;
2129}
2130
2131/*
2132 * requires that rx->skb is a frame with ethernet header
2133 */
76ee65bf 2134static void
5cf121c3 2135ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2136{
eb9fb5b8
JB		 2137 struct ieee80211_sub_if_data *sdata = rx->sdata;
2138 struct net_device *dev = sdata->dev;
76ee65bf 2139 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2140 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2141 struct sta_info *dsta;
571ecf67 2142
76ee65bf
RR		 2143 skb = rx->skb;
2144 xmit_skb = NULL;
571ecf67 2145
5a490510
JB		 2146 ieee80211_rx_stats(dev, skb->len);
2147
de8f18d3
JB		 2148 if (rx->sta) {
2149 /* The seqno index has the same property as needed
2150 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2151 * for non-QoS-data frames. Here we know it's a data
2152 * frame, so count MSDUs.
2153 */
0f9c5a61 2154 u64_stats_update_begin(&rx->sta->rx_stats.syncp);
de8f18d3 2155 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
0f9c5a61 2156 u64_stats_update_end(&rx->sta->rx_stats.syncp);
de8f18d3
JB		 2157 }
2158
05c914fe
JB		 2159 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2160 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2161 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2162 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2163 if (is_multicast_ether_addr(ehdr->h_dest)) {
2164 /*
2165 * send multicast frames both to higher layers in
2166 * local net stack and back to the wireless medium
2167 */
76ee65bf 2168 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2169 if (!xmit_skb)
bdcbd8e0 2170 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2171 dev->name);
571ecf67 2172 } else {
abe60632
JB		 2173 dsta = sta_info_get(sdata, skb->data);
2174 if (dsta) {
ce3edf6d
JB		 2175 /*
2176 * The destination station is associated to
2177 * this AP (in this VLAN), so send the frame
2178 * directly to it and do not pass it to local
2179 * net stack.
571ecf67 2180 */
76ee65bf 2181 xmit_skb = skb;
571ecf67
JB		 2182 skb = NULL;
2183 }
571ecf67
JB		 2184 }
2185 }
2186
59d9cb07 2187#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2188 if (skb) {
2189 /* 'align' will only take the values 0 or 2 here since all
2190 * frames are required to be aligned to 2-byte boundaries
2191 * when being passed to mac80211; the code here works just
2192 * as well if that isn't true, but mac80211 assumes it can
2193 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2194 */
9e890a1f
JB		 2195 int align;
2196
2197 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2198 if (align) {
2199 if (WARN_ON(skb_headroom(skb) < 3)) {
2200 dev_kfree_skb(skb);
2201 skb = NULL;
2202 } else {
2203 u8 *data = skb->data;
8ce0b589
ZY		 2204 size_t len = skb_headlen(skb);
2205 skb->data -= align;
2206 memmove(skb->data, data, len);
2207 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2208 }
2209 }
9e890a1f 2210 }
d1c3a37c
JB		 2211#endif
2212
9e890a1f
JB		 2213 if (skb) {
2214 /* deliver to local stack */
2215 skb->protocol = eth_type_trans(skb, dev);
2216 memset(skb->cb, 0, sizeof(skb->cb));
af9f9b22
JB		 2217 if (rx->napi)
2218 napi_gro_receive(rx->napi, skb);
06d181a8
JB		 2219 else
2220 netif_receive_skb(skb);
571ecf67
JB		 2221 }
2222
76ee65bf 2223 if (xmit_skb) {
aef6c928
HS		 2224 /*
2225 * Send to wireless media and increase priority by 256 to
2226 * keep the received priority instead of reclassifying
2227 * the frame (see cfg80211_classify8021d).
2228 */
2229 xmit_skb->priority += 256;
f831e909 2230 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2231 skb_reset_network_header(xmit_skb);
2232 skb_reset_mac_header(xmit_skb);
76ee65bf 2233 dev_queue_xmit(xmit_skb);
571ecf67 2234 }
76ee65bf
RR		 2235}
2236
49461622 2237static ieee80211_rx_result debug_noinline
5cf121c3 2238ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2239{
eb9fb5b8 2240 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2241 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2243 __le16 fc = hdr->frame_control;
eaf85ca7 2244 struct sk_buff_head frame_list;
554891e6 2245 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2246
358c8d9d 2247 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2248 return RX_CONTINUE;
fd4c7f2f 2249
358c8d9d 2250 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2251 return RX_DROP_MONITOR;
fd4c7f2f 2252
554891e6 2253 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2254 return RX_CONTINUE;
fd4c7f2f 2255
eaf85ca7
ZY		 2256 if (ieee80211_has_a4(hdr->frame_control) &&
2257 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2258 !rx->sdata->u.vlan.sta)
e4c26add 2259 return RX_DROP_UNUSABLE;
fd4c7f2f 2260
eaf85ca7
ZY		 2261 if (is_multicast_ether_addr(hdr->addr1) &&
2262 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2263 rx->sdata->u.vlan.sta) ||
2264 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2265 rx->sdata->u.mgd.use_4addr)))
e4c26add 2266 return RX_DROP_UNUSABLE;
fd4c7f2f 2267
eaf85ca7
ZY		 2268 skb->dev = dev;
2269 __skb_queue_head_init(&frame_list);
fd4c7f2f 2270
eaf85ca7
ZY		 2271 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2272 rx->sdata->vif.type,
8b3becad 2273 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2274
eaf85ca7
ZY		 2275 while (!skb_queue_empty(&frame_list)) {
2276 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2277
358c8d9d 2278 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2279 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2280 continue;
2281 }
fd4c7f2f
RR		 2282
2283 ieee80211_deliver_skb(rx);
2284 }
2285
9ae54c84 2286 return RX_QUEUED;
fd4c7f2f
RR		 2287}
2288
bf94e17b 2289#ifdef CONFIG_MAC80211_MESH
b0dee578 2290static ieee80211_rx_result
e32f85f7
LCC		 2291ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2292{
30789eb6
TP		 2293 struct ieee80211_hdr *fwd_hdr, *hdr;
2294 struct ieee80211_tx_info *info;
e32f85f7 2295 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2296 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2297 struct ieee80211_local *local = rx->local;
eb9fb5b8 2298 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2299 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
cf440128 2300 u16 ac, q, hdrlen;
e32f85f7
LCC		 2301
2302 hdr = (struct ieee80211_hdr *) skb->data;
2303 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2304
2305 /* make sure fixed part of mesh header is there, also checks skb len */
2306 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2307 return RX_DROP_MONITOR;
2308
2309 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2310
2311 /* make sure full mesh header is there, also checks skb len */
2312 if (!pskb_may_pull(rx->skb,
2313 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2314 return RX_DROP_MONITOR;
2315
2316 /* reload pointers */
2317 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2318 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2319
d0c22119
BC		 2320 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2321 return RX_DROP_MONITOR;
2322
2157fdd6
TP		 2323 /* frame is in RMC, don't forward */
2324 if (ieee80211_is_data(hdr->frame_control) &&
2325 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2326 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2327 return RX_DROP_MONITOR;
2328
5c90067c 2329 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2330 return RX_CONTINUE;
2331
2332 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2333 return RX_DROP_MONITOR;
2334
43b7b314 2335 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2336 struct mesh_path *mppath;
43b7b314
JC		 2337 char *proxied_addr;
2338 char *mpp_addr;
2339
2340 if (is_multicast_ether_addr(hdr->addr1)) {
2341 mpp_addr = hdr->addr3;
2342 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2343 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2344 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2345 mpp_addr = hdr->addr4;
2346 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2347 } else {
2348 return RX_DROP_MONITOR;
43b7b314 2349 }
79617dee 2350
79617dee 2351 rcu_read_lock();
bf7cd94d 2352 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2353 if (!mppath) {
bf7cd94d 2354 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2355 } else {
2356 spin_lock_bh(&mppath->state_lock);
b203ca39 2357 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2358 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
ab1c7906 2359 mppath->exp_time = jiffies;
79617dee
Y		 2360 spin_unlock_bh(&mppath->state_lock);
2361 }
2362 rcu_read_unlock();
2363 }
2364
3c5772a5
JC		 2365 /* Frame has reached destination. Don't forward */
2366 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2367 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2368 return RX_CONTINUE;
2369
cf440128
MK		 2370 ac = ieee80211_select_queue_80211(sdata, skb, hdr);
2371 q = sdata->vif.hw_queue[ac];
d3c1597b 2372 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2373 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2374 return RX_DROP_MONITOR;
2375 }
2376 skb_set_queue_mapping(skb, q);
e32f85f7 2377
30789eb6
TP		 2378 if (!--mesh_hdr->ttl) {
2379 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2380 goto out;
30789eb6
TP		 2381 }
2382
d665508b
CYY		 2383 if (!ifmsh->mshcfg.dot11MeshForwarding)
2384 goto out;
2385
30789eb6
TP		 2386 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2387 if (!fwd_skb) {
bdcbd8e0 2388 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2389 sdata->name);
30789eb6
TP		 2390 goto out;
2391 }
2392
2393 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2394 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2395 info = IEEE80211_SKB_CB(fwd_skb);
2396 memset(info, 0, sizeof(*info));
2397 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2398 info->control.vif = &rx->sdata->vif;
2399 info->control.jiffies = jiffies;
2400 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2401 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2402 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2403 /* update power mode indication when forwarding */
2404 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2405 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2406 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2407 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2408 } else {
2409 /* unable to resolve next hop */
bf7cd94d 2410 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2411 fwd_hdr->addr3, 0,
2412 WLAN_REASON_MESH_PATH_NOFORWARD,
2413 fwd_hdr->addr2);
30789eb6 2414 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2415 kfree_skb(fwd_skb);
30789eb6 2416 return RX_DROP_MONITOR;
e32f85f7
LCC		 2417 }
2418
30789eb6
TP		 2419 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2420 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2421 out:
df140465 2422 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2423 return RX_CONTINUE;
df140465 2424 return RX_DROP_MONITOR;
e32f85f7 2425}
bf94e17b 2426#endif
e32f85f7 2427
49461622 2428static ieee80211_rx_result debug_noinline
5cf121c3 2429ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2430{
eb9fb5b8 2431 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2432 struct ieee80211_local *local = rx->local;
eb9fb5b8 2433 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2434 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2435 __le16 fc = hdr->frame_control;
4114fa21 2436 bool port_control;
ce3edf6d 2437 int err;
76ee65bf 2438
358c8d9d 2439 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2440 return RX_CONTINUE;
76ee65bf 2441
358c8d9d 2442 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2443 return RX_DROP_MONITOR;
76ee65bf 2444
f14543ee 2445 /*
e7f4a940
JB		 2446 * Send unexpected-4addr-frame event to hostapd. For older versions,
2447 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2448 */
2449 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2450 sdata->vif.type == NL80211_IFTYPE_AP) {
2451 if (rx->sta &&
2452 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2453 cfg80211_rx_unexpected_4addr_frame(
2454 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2455 return RX_DROP_MONITOR;
e7f4a940 2456 }
f14543ee 2457
4114fa21 2458 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2459 if (unlikely(err))
e4c26add 2460 return RX_DROP_UNUSABLE;
76ee65bf 2461
358c8d9d 2462 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2463 return RX_DROP_MONITOR;
ce3edf6d 2464
8a4d32f3
AN		 2465 /* directly handle TDLS channel switch requests/responses */
2466 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2467 cpu_to_be16(ETH_P_TDLS))) {
2468 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2469
2470 if (pskb_may_pull(rx->skb,
2471 offsetof(struct ieee80211_tdls_data, u)) &&
2472 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2473 tf->category == WLAN_CATEGORY_TDLS &&
2474 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2475 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2476 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2477 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2478 if (rx->sta)
e5a9f8d0 2479 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2480
2481 return RX_QUEUED;
2482 }
2483 }
2484
4114fa21
FF		 2485 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2486 unlikely(port_control) && sdata->bss) {
2487 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2488 u.ap);
2489 dev = sdata->dev;
2490 rx->sdata = sdata;
2491 }
2492
76ee65bf
RR		 2493 rx->skb->dev = dev;
2494
602fae42
JB		 2495 if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2496 local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2497 !is_multicast_ether_addr(
2498 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2499 (!local->scanning &&
602fae42
JB		 2500 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
2501 mod_timer(&local->dynamic_ps_timer, jiffies +
2502 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
e15276a4 2503
76ee65bf 2504 ieee80211_deliver_skb(rx);
571ecf67 2505
9ae54c84 2506 return RX_QUEUED;
571ecf67
JB		 2507}
2508
49461622 2509static ieee80211_rx_result debug_noinline
f9e124fb 2510ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2511{
71364716 2512 struct sk_buff *skb = rx->skb;
a7767f95 2513 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2514 struct tid_ampdu_rx *tid_agg_rx;
2515 u16 start_seq_num;
2516 u16 tid;
2517
a7767f95 2518 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2519 return RX_CONTINUE;
71364716 2520
a7767f95 2521 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2522 struct {
2523 __le16 control, start_seq_num;
2524 } __packed bar_data;
6382246e
EG		 2525 struct ieee80211_event event = {
2526 .type = BAR_RX_EVENT,
2527 };
8ae5977f 2528
71364716 2529 if (!rx->sta)
a02ae758 2530 return RX_DROP_MONITOR;
8ae5977f
JB		 2531
2532 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2533 &bar_data, sizeof(bar_data)))
2534 return RX_DROP_MONITOR;
2535
8ae5977f 2536 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2537
2538 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2539 if (!tid_agg_rx)
a02ae758 2540 return RX_DROP_MONITOR;
71364716 2541
8ae5977f 2542 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2543 event.u.ba.tid = tid;
2544 event.u.ba.ssn = start_seq_num;
2545 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2546
2547 /* reset session timer */
20ad19d0
JB		 2548 if (tid_agg_rx->timeout)
2549 mod_timer(&tid_agg_rx->session_timer,
2550 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2551
dd318575 2552 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2553 /* release stored frames up to start of BAR */
d3b2fb53 2554 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2555 start_seq_num, frames);
dd318575
JB		 2556 spin_unlock(&tid_agg_rx->reorder_lock);
2557
6382246e
EG		 2558 drv_event_callback(rx->local, rx->sdata, &event);
2559
a02ae758
JB		 2560 kfree_skb(skb);
2561 return RX_QUEUED;
71364716
RR		 2562 }
2563
08daecae
JB		 2564 /*
2565 * After this point, we only want management frames,
2566 * so we can drop all remaining control frames to
2567 * cooked monitor interfaces.
2568 */
2569 return RX_DROP_MONITOR;
71364716
RR		 2570}
2571
f4f727a6
JM		 2572static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2573 struct ieee80211_mgmt *mgmt,
2574 size_t len)
fea14732
JM		 2575{
2576 struct ieee80211_local *local = sdata->local;
2577 struct sk_buff *skb;
2578 struct ieee80211_mgmt *resp;
2579
b203ca39 2580 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2581 /* Not to own unicast address */
2582 return;
2583 }
2584
b203ca39
JP		 2585 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2586 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2587 /* Not from the current AP or not associated yet. */
fea14732
JM		 2588 return;
2589 }
2590
2591 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2592 /* Too short SA Query request frame */
2593 return;
2594 }
2595
2596 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2597 if (skb == NULL)
2598 return;
2599
2600 skb_reserve(skb, local->hw.extra_tx_headroom);
2601 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2602 memset(resp, 0, 24);
2603 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2604 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2605 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2606 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2607 IEEE80211_STYPE_ACTION);
2608 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2609 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2610 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2611 memcpy(resp->u.action.u.sa_query.trans_id,
2612 mgmt->u.action.u.sa_query.trans_id,
2613 WLAN_SA_QUERY_TR_ID_LEN);
2614
62ae67be 2615 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2616}
2617
2e161f78
JB		 2618static ieee80211_rx_result debug_noinline
2619ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2620{
2621 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2622 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2623
2624 /*
2625 * From here on, look only at management frames.
2626 * Data and control frames are already handled,
2627 * and unknown (reserved) frames are useless.
2628 */
2629 if (rx->skb->len < 24)
2630 return RX_DROP_MONITOR;
2631
2632 if (!ieee80211_is_mgmt(mgmt->frame_control))
2633 return RX_DROP_MONITOR;
2634
ee971924
JB		 2635 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2636 ieee80211_is_beacon(mgmt->frame_control) &&
2637 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2638 int sig = 0;
2639
30686bf7 2640 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2641 sig = status->signal;
2642
ee971924
JB		 2643 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2644 rx->skb->data, rx->skb->len,
37c73b5f 2645 status->freq, sig);
ee971924
JB		 2646 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2647 }
2648
2e161f78
JB		 2649 if (ieee80211_drop_unencrypted_mgmt(rx))
2650 return RX_DROP_UNUSABLE;
2651
2652 return RX_CONTINUE;
2653}
2654
de1ede7a
JB		 2655static ieee80211_rx_result debug_noinline
2656ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2657{
2658 struct ieee80211_local *local = rx->local;
eb9fb5b8 2659 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2660 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2661 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2662 int len = rx->skb->len;
2663
2664 if (!ieee80211_is_action(mgmt->frame_control))
2665 return RX_CONTINUE;
2666
026331c4
JM		 2667 /* drop too small frames */
2668 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2669 return RX_DROP_UNUSABLE;
de1ede7a 2670
815b8092 2671 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2672 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2673 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2674 return RX_DROP_UNUSABLE;
de1ede7a 2675
de1ede7a 2676 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2677 case WLAN_CATEGORY_HT:
2678 /* reject HT action frames from stations not supporting HT */
2679 if (!rx->sta->sta.ht_cap.ht_supported)
2680 goto invalid;
2681
2682 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2683 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2684 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2685 sdata->vif.type != NL80211_IFTYPE_AP &&
2686 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2687 break;
2688
ec61cd63 2689 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2690 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2691 goto invalid;
2692
2693 switch (mgmt->u.action.u.ht_smps.action) {
2694 case WLAN_HT_ACTION_SMPS: {
2695 struct ieee80211_supported_band *sband;
af0ed69b 2696 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2697
2698 /* convert to HT capability */
2699 switch (mgmt->u.action.u.ht_smps.smps_control) {
2700 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2701 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2702 break;
2703 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2704 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2705 break;
2706 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2707 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2708 break;
2709 default:
2710 goto invalid;
2711 }
1d8d3dec
JB		 2712
2713 /* if no change do nothing */
af0ed69b 2714 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2715 goto handled;
af0ed69b 2716 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2717
2718 sband = rx->local->hw.wiphy->bands[status->band];
2719
64f68e5d
JB		 2720 rate_control_rate_update(local, sband, rx->sta,
2721 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2722 goto handled;
2723 }
ec61cd63
JB		 2724 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2725 struct ieee80211_supported_band *sband;
2726 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2727 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2728
2729 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2730 if (!(rx->sta->sta.ht_cap.cap &
2731 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2732 goto handled;
2733
e1a0c6b3 2734 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2735 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2736 else
1c45c5ce
EP		 2737 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2738
2739 /* set cur_max_bandwidth and recalc sta bw */
2740 rx->sta->cur_max_bandwidth = max_bw;
2741 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2742
e1a0c6b3 2743 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2744 goto handled;
2745
1c45c5ce 2746 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2747 sband = rx->local->hw.wiphy->bands[status->band];
2748
2749 rate_control_rate_update(local, sband, rx->sta,
2750 IEEE80211_RC_BW_CHANGED);
2751 goto handled;
2752 }
1d8d3dec
JB		 2753 default:
2754 goto invalid;
2755 }
2756
0af83d3d 2757 break;
1b3a2e49
JB		 2758 case WLAN_CATEGORY_PUBLIC:
2759 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2760 goto invalid;
2761 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2762 break;
2763 if (!rx->sta)
2764 break;
2765 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2766 break;
2767 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2768 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2769 break;
2770 if (len < offsetof(struct ieee80211_mgmt,
2771 u.action.u.ext_chan_switch.variable))
2772 goto invalid;
2773 goto queue;
0af83d3d
JB		 2774 case WLAN_CATEGORY_VHT:
2775 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2776 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2777 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2778 sdata->vif.type != NL80211_IFTYPE_AP &&
2779 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2780 break;
2781
2782 /* verify action code is present */
2783 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2784 goto invalid;
2785
2786 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2787 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2788 u8 opmode;
2789
2790 /* verify opmode is present */
2791 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2792 goto invalid;
2793
2794 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2795
2796 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
cf1e05c6 2797 opmode, status->band);
0af83d3d
JB		 2798 goto handled;
2799 }
23a1f8d4
SS		 2800 case WLAN_VHT_ACTION_GROUPID_MGMT: {
2801 if (len < IEEE80211_MIN_ACTION_SIZE + 25)
2802 goto invalid;
2803 goto queue;
2804 }
0af83d3d
JB		 2805 default:
2806 break;
2807 }
1d8d3dec 2808 break;
de1ede7a 2809 case WLAN_CATEGORY_BACK:
8abd3f9b 2810 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2811 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2812 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2813 sdata->vif.type != NL80211_IFTYPE_AP &&
2814 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2815 break;
8abd3f9b 2816
026331c4
JM		 2817 /* verify action_code is present */
2818 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2819 break;
2820
de1ede7a
JB		 2821 switch (mgmt->u.action.u.addba_req.action_code) {
2822 case WLAN_ACTION_ADDBA_REQ:
2823 if (len < (IEEE80211_MIN_ACTION_SIZE +
2824 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2825 goto invalid;
2826 break;
de1ede7a
JB		 2827 case WLAN_ACTION_ADDBA_RESP:
2828 if (len < (IEEE80211_MIN_ACTION_SIZE +
2829 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2830 goto invalid;
2831 break;
de1ede7a
JB		 2832 case WLAN_ACTION_DELBA:
2833 if (len < (IEEE80211_MIN_ACTION_SIZE +
2834 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2835 goto invalid;
2836 break;
2837 default:
2838 goto invalid;
de1ede7a 2839 }
bed7ee6e 2840
8b58ff83 2841 goto queue;
39192c0b 2842 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2843 /* verify action_code is present */
2844 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2845 break;
2846
39192c0b
JB		 2847 switch (mgmt->u.action.u.measurement.action_code) {
2848 case WLAN_ACTION_SPCT_MSR_REQ:
57fbcce3 2849 if (status->band != NL80211_BAND_5GHZ)
cd7760e6
SW		 2850 break;
2851
39192c0b
JB		 2852 if (len < (IEEE80211_MIN_ACTION_SIZE +
2853 sizeof(mgmt->u.action.u.measurement)))
84040805 2854 break;
cd7760e6
SW		 2855
2856 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2857 break;
2858
39192c0b 2859 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2860 goto handled;
cd7760e6
SW		 2861 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2862 u8 *bssid;
2863 if (len < (IEEE80211_MIN_ACTION_SIZE +
2864 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2865 break;
cc32abd4 2866
cd7760e6 2867 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2868 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2869 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2870 break;
2871
2872 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2873 bssid = sdata->u.mgd.bssid;
2874 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2875 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2876 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2877 bssid = mgmt->sa;
cd7760e6
SW		 2878 else
2879 break;
2880
2881 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2882 break;
c481ec97 2883
8b58ff83 2884 goto queue;
cd7760e6 2885 }
39192c0b
JB		 2886 }
2887 break;
fea14732
JM		 2888 case WLAN_CATEGORY_SA_QUERY:
2889 if (len < (IEEE80211_MIN_ACTION_SIZE +
2890 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2891 break;
2892
fea14732
JM		 2893 switch (mgmt->u.action.u.sa_query.action) {
2894 case WLAN_ACTION_SA_QUERY_REQUEST:
2895 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2896 break;
fea14732 2897 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2898 goto handled;
fea14732
JM		 2899 }
2900 break;
8db09850 2901 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2902 if (len < (IEEE80211_MIN_ACTION_SIZE +
2903 sizeof(mgmt->u.action.u.self_prot.action_code)))
2904 break;
2905
8db09850
TP		 2906 switch (mgmt->u.action.u.self_prot.action_code) {
2907 case WLAN_SP_MESH_PEERING_OPEN:
2908 case WLAN_SP_MESH_PEERING_CLOSE:
2909 case WLAN_SP_MESH_PEERING_CONFIRM:
2910 if (!ieee80211_vif_is_mesh(&sdata->vif))
2911 goto invalid;
a6dad6a2 2912 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2913 /* userspace handles this frame */
2914 break;
2915 goto queue;
2916 case WLAN_SP_MGK_INFORM:
2917 case WLAN_SP_MGK_ACK:
2918 if (!ieee80211_vif_is_mesh(&sdata->vif))
2919 goto invalid;
2920 break;
2921 }
2922 break;
d3aaec8a 2923 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2924 if (len < (IEEE80211_MIN_ACTION_SIZE +
2925 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2926 break;
2927
77a121c3
JB		 2928 if (!ieee80211_vif_is_mesh(&sdata->vif))
2929 break;
25d49e4d 2930 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2931 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2932 break;
2933 goto queue;
84040805 2934 }
026331c4 2935
2e161f78
JB		 2936 return RX_CONTINUE;
2937
bed7ee6e 2938 invalid:
554891e6 2939 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2940 /* will return in the next handlers */
2941 return RX_CONTINUE;
2942
2943 handled:
2944 if (rx->sta)
e5a9f8d0 2945 rx->sta->rx_stats.packets++;
2e161f78
JB		 2946 dev_kfree_skb(rx->skb);
2947 return RX_QUEUED;
2948
2949 queue:
2950 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2951 skb_queue_tail(&sdata->skb_queue, rx->skb);
2952 ieee80211_queue_work(&local->hw, &sdata->work);
2953 if (rx->sta)
e5a9f8d0 2954 rx->sta->rx_stats.packets++;
2e161f78
JB		 2955 return RX_QUEUED;
2956}
2957
2958static ieee80211_rx_result debug_noinline
2959ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2960{
554891e6 2961 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2962 int sig = 0;
2e161f78
JB		 2963
2964 /* skip known-bad action frames and return them in the next handler */
554891e6 2965 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2966 return RX_CONTINUE;
d7907448 2967
026331c4
JM		 2968 /*
2969 * Getting here means the kernel doesn't know how to handle
2970 * it, but maybe userspace does ... include returned frames
2971 * so userspace can register for those to know whether ones
2972 * it transmitted were processed or returned.
2973 */
026331c4 2974
30686bf7 2975 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2976 sig = status->signal;
2977
71bbc994 2978 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2979 rx->skb->data, rx->skb->len, 0)) {
2e161f78 2980 if (rx->sta)
e5a9f8d0 2981 rx->sta->rx_stats.packets++;
2e161f78
JB		 2982 dev_kfree_skb(rx->skb);
2983 return RX_QUEUED;
2984 }
2985
2e161f78
JB		 2986 return RX_CONTINUE;
2987}
2988
2989static ieee80211_rx_result debug_noinline
2990ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2991{
2992 struct ieee80211_local *local = rx->local;
2993 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2994 struct sk_buff *nskb;
2995 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2996 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2997
2998 if (!ieee80211_is_action(mgmt->frame_control))
2999 return RX_CONTINUE;
3000
3001 /*
3002 * For AP mode, hostapd is responsible for handling any action
3003 * frames that we didn't handle, including returning unknown
3004 * ones. For all other modes we will return them to the sender,
3005 * setting the 0x80 bit in the action category, as required by
4b5ebccc 3006 * 802.11-2012 9.24.4.
2e161f78
JB		 3007 * Newer versions of hostapd shall also use the management frame
3008 * registration mechanisms, but older ones still use cooked
3009 * monitor interfaces so push all frames there.
3010 */
554891e6 3011 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 3012 (sdata->vif.type == NL80211_IFTYPE_AP ||
3013 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
3014 return RX_DROP_MONITOR;
026331c4 3015
4b5ebccc
JB		 3016 if (is_multicast_ether_addr(mgmt->da))
3017 return RX_DROP_MONITOR;
3018
84040805
JB		 3019 /* do not return rejected action frames */
3020 if (mgmt->u.action.category & 0x80)
3021 return RX_DROP_UNUSABLE;
3022
3023 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
3024 GFP_ATOMIC);
3025 if (nskb) {
292b4df6 3026 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 3027
292b4df6
JL		 3028 nmgmt->u.action.category |= 0x80;
3029 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
3030 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 3031
3032 memset(nskb->cb, 0, sizeof(nskb->cb));
3033
07e5a5f5
JB		 3034 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
3035 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
3036
3037 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
3038 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
3039 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 3040 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 3041 info->hw_queue =
3042 local->hw.offchannel_tx_hw_queue;
3043 }
3044
3045 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3046 status->band);
de1ede7a 3047 }
39192c0b
JB		 3048 dev_kfree_skb(rx->skb);
3049 return RX_QUEUED;
de1ede7a
JB		 3050}
3051
49461622 3052static ieee80211_rx_result debug_noinline
5cf121c3 3053ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3054{
eb9fb5b8 3055 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3056 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3057 __le16 stype;
571ecf67 3058
77a121c3 3059 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3060
77a121c3
JB		 3061 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3062 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3063 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3064 sdata->vif.type != NL80211_IFTYPE_STATION)
3065 return RX_DROP_MONITOR;
472dbc45 3066
77a121c3 3067 switch (stype) {
66e67e41 3068 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3069 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3070 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3071 /* process for all: mesh, mlme, ibss */
3072 break;
66e67e41
JB		 3073 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3074 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3075 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3076 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3077 if (is_multicast_ether_addr(mgmt->da) &&
3078 !is_broadcast_ether_addr(mgmt->da))
3079 return RX_DROP_MONITOR;
3080
77a121c3
JB		 3081 /* process only for station */
3082 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3083 return RX_DROP_MONITOR;
3084 break;
3085 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3086 /* process only for ibss and mesh */
3087 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3088 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3089 return RX_DROP_MONITOR;
3090 break;
3091 default:
3092 return RX_DROP_MONITOR;
3093 }
f9d540ee 3094
77a121c3 3095 /* queue up frame and kick off work to process it */
c1475ca9 3096 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3097 skb_queue_tail(&sdata->skb_queue, rx->skb);
3098 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3099 if (rx->sta)
e5a9f8d0 3100 rx->sta->rx_stats.packets++;
46900298 3101
77a121c3 3102 return RX_QUEUED;
571ecf67
JB		 3103}
3104
5f0b7de5
JB		 3105static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3106 struct ieee80211_rate *rate)
3d30d949
MW		 3107{
3108 struct ieee80211_sub_if_data *sdata;
3109 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3110 struct sk_buff *skb = rx->skb, *skb2;
3111 struct net_device *prev_dev = NULL;
eb9fb5b8 3112 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3113 int needed_headroom;
3d30d949 3114
554891e6
JB		 3115 /*
3116 * If cooked monitor has been processed already, then
3117 * don't do it again. If not, set the flag.
3118 */
3119 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3120 goto out_free_skb;
554891e6 3121 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3122
152c477a
JB		 3123 /* If there are no cooked monitor interfaces, just free the SKB */
3124 if (!local->cooked_mntrs)
3125 goto out_free_skb;
3126
1f7bba79
JB		 3127 /* vendor data is long removed here */
3128 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3129 /* room for the radiotap header based on driver features */
1f7bba79 3130 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3131
293702a3
JB		 3132 if (skb_headroom(skb) < needed_headroom &&
3133 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3134 goto out_free_skb;
3d30d949 3135
293702a3 3136 /* prepend radiotap information */
973ef21a
FF		 3137 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3138 false);
3d30d949 3139
d57a544d 3140 skb_reset_mac_header(skb);
3d30d949
MW		 3141 skb->ip_summed = CHECKSUM_UNNECESSARY;
3142 skb->pkt_type = PACKET_OTHERHOST;
3143 skb->protocol = htons(ETH_P_802_2);
3144
3145 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3146 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3147 continue;
3148
05c914fe 3149 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 3150 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3151 continue;
3152
3153 if (prev_dev) {
3154 skb2 = skb_clone(skb, GFP_ATOMIC);
3155 if (skb2) {
3156 skb2->dev = prev_dev;
5548a8a1 3157 netif_receive_skb(skb2);
3d30d949
MW		 3158 }
3159 }
3160
3161 prev_dev = sdata->dev;
5a490510 3162 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3163 }
3164
3165 if (prev_dev) {
3166 skb->dev = prev_dev;
5548a8a1 3167 netif_receive_skb(skb);
554891e6
JB		 3168 return;
3169 }
3d30d949
MW		 3170
3171 out_free_skb:
3172 dev_kfree_skb(skb);
3173}
3174
aa0c8636
CL		 3175static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3176 ieee80211_rx_result res)
3177{
3178 switch (res) {
3179 case RX_DROP_MONITOR:
3180 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3181 if (rx->sta)
e5a9f8d0 3182 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3183 /* fall through */
3184 case RX_CONTINUE: {
3185 struct ieee80211_rate *rate = NULL;
3186 struct ieee80211_supported_band *sband;
3187 struct ieee80211_rx_status *status;
3188
3189 status = IEEE80211_SKB_RXCB((rx->skb));
3190
3191 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3192 if (!(status->flag & RX_FLAG_HT) &&
3193 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3194 rate = &sband->bitrates[status->rate_idx];
3195
3196 ieee80211_rx_cooked_monitor(rx, rate);
3197 break;
3198 }
3199 case RX_DROP_UNUSABLE:
3200 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3201 if (rx->sta)
e5a9f8d0 3202 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3203 dev_kfree_skb(rx->skb);
3204 break;
3205 case RX_QUEUED:
3206 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3207 break;
3208 }
3209}
571ecf67 3210
f9e124fb
CL		 3211static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3212 struct sk_buff_head *frames)
58905290 3213{
58905290 3214 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3215 struct sk_buff *skb;
8944b79f 3216
e32f85f7
LCC		 3217#define CALL_RXH(rxh) \
3218 do { \
3219 res = rxh(rx); \
3220 if (res != RX_CONTINUE) \
2569a826 3221 goto rxh_next; \
8ebaa5b0 3222 } while (0)
49461622 3223
45ceeee8
JB		 3224 /* Lock here to avoid hitting all of the data used in the RX
3225 * path (e.g. key data, station data, ...) concurrently when
3226 * a frame is released from the reorder buffer due to timeout
3227 * from the timer, potentially concurrently with RX from the
3228 * driver.
3229 */
f9e124fb 3230 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3231
f9e124fb 3232 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3233 /*
3234 * all the other fields are valid across frames
3235 * that belong to an aMPDU since they are on the
3236 * same TID from the same station
3237 */
3238 rx->skb = skb;
3239
8ebaa5b0
JB		 3240 CALL_RXH(ieee80211_rx_h_check_more_data);
3241 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll);
3242 CALL_RXH(ieee80211_rx_h_sta_process);
3243 CALL_RXH(ieee80211_rx_h_decrypt);
3244 CALL_RXH(ieee80211_rx_h_defragment);
3245 CALL_RXH(ieee80211_rx_h_michael_mic_verify);
2569a826 3246 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3247#ifdef CONFIG_MAC80211_MESH
aa0c8636 3248 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3249 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3250#endif
8ebaa5b0
JB		 3251 CALL_RXH(ieee80211_rx_h_amsdu);
3252 CALL_RXH(ieee80211_rx_h_data);
f9e124fb
CL		 3253
3254 /* special treatment -- needs the queue */
3255 res = ieee80211_rx_h_ctrl(rx, frames);
3256 if (res != RX_CONTINUE)
3257 goto rxh_next;
3258
8ebaa5b0
JB		 3259 CALL_RXH(ieee80211_rx_h_mgmt_check);
3260 CALL_RXH(ieee80211_rx_h_action);
3261 CALL_RXH(ieee80211_rx_h_userspace_mgmt);
3262 CALL_RXH(ieee80211_rx_h_action_return);
3263 CALL_RXH(ieee80211_rx_h_mgmt);
49461622 3264
aa0c8636
CL		 3265 rxh_next:
3266 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3267
49461622 3268#undef CALL_RXH
aa0c8636 3269 }
24a8fdad 3270
f9e124fb 3271 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3272}
3273
4406c376 3274static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3275{
f9e124fb 3276 struct sk_buff_head reorder_release;
aa0c8636
CL		 3277 ieee80211_rx_result res = RX_DROP_MONITOR;
3278
f9e124fb
CL		 3279 __skb_queue_head_init(&reorder_release);
3280
aa0c8636
CL		 3281#define CALL_RXH(rxh) \
3282 do { \
3283 res = rxh(rx); \
3284 if (res != RX_CONTINUE) \
3285 goto rxh_next; \
8ebaa5b0 3286 } while (0)
aa0c8636 3287
8ebaa5b0
JB		 3288 CALL_RXH(ieee80211_rx_h_check_dup);
3289 CALL_RXH(ieee80211_rx_h_check);
aa0c8636 3290
f9e124fb 3291 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3292
f9e124fb 3293 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3294 return;
49461622 3295
2569a826 3296 rxh_next:
aa0c8636
CL		 3297 ieee80211_rx_handlers_result(rx, res);
3298
3299#undef CALL_RXH
58905290
JB		 3300}
3301
2bff8ebf 3302/*
dd318575
JB		 3303 * This function makes calls into the RX path, therefore
3304 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3305 */
3306void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3307{
f9e124fb 3308 struct sk_buff_head frames;
554891e6
JB		 3309 struct ieee80211_rx_data rx = {
3310 .sta = sta,
3311 .sdata = sta->sdata,
3312 .local = sta->local,
9e26297a
JB		 3313 /* This is OK -- must be QoS data frame */
3314 .security_idx = tid,
3315 .seqno_idx = tid,
af9f9b22 3316 .napi = NULL, /* must be NULL to not have races */
554891e6 3317 };
2c15a0cf
CL		 3318 struct tid_ampdu_rx *tid_agg_rx;
3319
3320 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3321 if (!tid_agg_rx)
3322 return;
2bff8ebf 3323
f9e124fb
CL		 3324 __skb_queue_head_init(&frames);
3325
2c15a0cf 3326 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3327 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3328 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3329
b497de63
EG		 3330 if (!skb_queue_empty(&frames)) {
3331 struct ieee80211_event event = {
3332 .type = BA_FRAME_TIMEOUT,
3333 .u.ba.tid = tid,
3334 .u.ba.sta = &sta->sta,
3335 };
3336 drv_event_callback(rx.local, rx.sdata, &event);
3337 }
3338
f9e124fb 3339 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3340}
3341
06470f74
SS		 3342void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
3343 u16 ssn, u64 filtered,
3344 u16 received_mpdus)
3345{
3346 struct sta_info *sta;
3347 struct tid_ampdu_rx *tid_agg_rx;
3348 struct sk_buff_head frames;
3349 struct ieee80211_rx_data rx = {
3350 /* This is OK -- must be QoS data frame */
3351 .security_idx = tid,
3352 .seqno_idx = tid,
3353 };
3354 int i, diff;
3355
3356 if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
3357 return;
3358
3359 __skb_queue_head_init(&frames);
3360
3361 sta = container_of(pubsta, struct sta_info, sta);
3362
3363 rx.sta = sta;
3364 rx.sdata = sta->sdata;
3365 rx.local = sta->local;
3366
3367 rcu_read_lock();
3368 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3369 if (!tid_agg_rx)
3370 goto out;
3371
3372 spin_lock_bh(&tid_agg_rx->reorder_lock);
3373
3374 if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
3375 int release;
3376
3377 /* release all frames in the reorder buffer */
3378 release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
3379 IEEE80211_SN_MODULO;
3380 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
3381 release, &frames);
3382 /* update ssn to match received ssn */
3383 tid_agg_rx->head_seq_num = ssn;
3384 } else {
3385 ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
3386 &frames);
3387 }
3388
3389 /* handle the case that received ssn is behind the mac ssn.
3390 * it can be tid_agg_rx->buf_size behind and still be valid */
3391 diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
3392 if (diff >= tid_agg_rx->buf_size) {
3393 tid_agg_rx->reorder_buf_filtered = 0;
3394 goto release;
3395 }
3396 filtered = filtered >> diff;
3397 ssn += diff;
3398
3399 /* update bitmap */
3400 for (i = 0; i < tid_agg_rx->buf_size; i++) {
3401 int index = (ssn + i) % tid_agg_rx->buf_size;
3402
3403 tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
3404 if (filtered & BIT_ULL(i))
3405 tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
3406 }
3407
3408 /* now process also frames that the filter marking released */
3409 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
3410
3411release:
3412 spin_unlock_bh(&tid_agg_rx->reorder_lock);
3413
3414 ieee80211_rx_handlers(&rx, &frames);
3415
3416 out:
3417 rcu_read_unlock();
3418}
3419EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
3420
571ecf67
JB		 3421/* main receive path */
3422
a58fbe1a 3423static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3424{
20b01f80 3425 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3426 struct sk_buff *skb = rx->skb;
a58fbe1a 3427 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3428 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3429 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3430 int multicast = is_multicast_ether_addr(hdr->addr1);
3431
51fb61e7 3432 switch (sdata->vif.type) {
05c914fe 3433 case NL80211_IFTYPE_STATION:
9bc383de 3434 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3435 return false;
a58fbe1a
JB		 3436 if (multicast)
3437 return true;
3438 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3439 case NL80211_IFTYPE_ADHOC:
23a24def 3440 if (!bssid)
3c2723f5 3441 return false;
6329b8d9
FF		 3442 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3443 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3444 return false;
a58fbe1a 3445 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3446 return true;
a58fbe1a 3447 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3448 return false;
a58fbe1a
JB		 3449 if (!multicast &&
3450 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3451 return false;
a58fbe1a 3452 if (!rx->sta) {
0fb8ca45 3453 int rate_idx;
5614618e
JB		 3454 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3455 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3456 else
eb9fb5b8 3457 rate_idx = status->rate_idx;
8bf11d8d
JB		 3458 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3459 BIT(rate_idx));
0fb8ca45 3460 }
a58fbe1a 3461 return true;
239281f8
RL		 3462 case NL80211_IFTYPE_OCB:
3463 if (!bssid)
3464 return false;
cc117298 3465 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3466 return false;
a58fbe1a 3467 if (!is_broadcast_ether_addr(bssid))
239281f8 3468 return false;
a58fbe1a
JB		 3469 if (!multicast &&
3470 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3471 return false;
a58fbe1a 3472 if (!rx->sta) {
239281f8
RL		 3473 int rate_idx;
3474 if (status->flag & RX_FLAG_HT)
3475 rate_idx = 0; /* TODO: HT rates */
3476 else
3477 rate_idx = status->rate_idx;
3478 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3479 BIT(rate_idx));
3480 }
a58fbe1a 3481 return true;
05c914fe 3482 case NL80211_IFTYPE_MESH_POINT:
a58fbe1a
JB		 3483 if (multicast)
3484 return true;
3485 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3486 case NL80211_IFTYPE_AP_VLAN:
3487 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3488 if (!bssid)
3489 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3490
3491 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3492 /*
3493 * Accept public action frames even when the
3494 * BSSID doesn't match, this is used for P2P
3495 * and location updates. Note that mac80211
3496 * itself never looks at these frames.
3497 */
2b9ccd4e
JB		 3498 if (!multicast &&
3499 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3500 return false;
d48b2968 3501 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3502 return true;
5c90067c 3503 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3504 }
3505
3506 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3507 /* ignore data frames to TDLS-peers */
3508 if (ieee80211_is_data(hdr->frame_control))
3509 return false;
3510 /* ignore action frames to TDLS-peers */
3511 if (ieee80211_is_action(hdr->frame_control) &&
1ec7bae8 3512 !is_broadcast_ether_addr(bssid) &&
db8e1732
AN		 3513 !ether_addr_equal(bssid, hdr->addr1))
3514 return false;
23a24def 3515 }
a58fbe1a 3516 return true;
05c914fe 3517 case NL80211_IFTYPE_WDS:
a7767f95 3518 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3519 return false;
a58fbe1a 3520 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3521 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3522 return ieee80211_is_public_action(hdr, skb->len) ||
3523 ieee80211_is_probe_req(hdr->frame_control) ||
3524 ieee80211_is_probe_resp(hdr->frame_control) ||
3525 ieee80211_is_beacon(hdr->frame_control);
2ca27bcf 3526 default:
fb1c1cd6 3527 break;
23a24def
JB		 3528 }
3529
a58fbe1a
JB		 3530 WARN_ON_ONCE(1);
3531 return false;
23a24def
JB		 3532}
3533
49ddf8e6
JB		 3534void ieee80211_check_fast_rx(struct sta_info *sta)
3535{
3536 struct ieee80211_sub_if_data *sdata = sta->sdata;
3537 struct ieee80211_local *local = sdata->local;
3538 struct ieee80211_key *key;
3539 struct ieee80211_fast_rx fastrx = {
3540 .dev = sdata->dev,
3541 .vif_type = sdata->vif.type,
3542 .control_port_protocol = sdata->control_port_protocol,
3543 }, *old, *new = NULL;
3544 bool assign = false;
3545
3546 /* use sparse to check that we don't return without updating */
3547 __acquire(check_fast_rx);
3548
3549 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header));
3550 BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN);
3551 ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header);
3552 ether_addr_copy(fastrx.vif_addr, sdata->vif.addr);
3553
c9c5962b
JB		 3554 fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS);
3555
49ddf8e6
JB		 3556 /* fast-rx doesn't do reordering */
3557 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
3558 !ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER))
3559 goto clear;
3560
3561 switch (sdata->vif.type) {
3562 case NL80211_IFTYPE_STATION:
3563 /* 4-addr is harder to deal with, later maybe */
3564 if (sdata->u.mgd.use_4addr)
3565 goto clear;
3566 /* software powersave is a huge mess, avoid all of it */
3567 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
3568 goto clear;
3569 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3570 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
3571 goto clear;
3572 if (sta->sta.tdls) {
3573 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3574 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3575 fastrx.expected_ds_bits = 0;
3576 } else {
3577 fastrx.sta_notify = sdata->u.mgd.probe_send_count > 0;
3578 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1);
3579 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3580 fastrx.expected_ds_bits =
3581 cpu_to_le16(IEEE80211_FCTL_FROMDS);
3582 }
3583 break;
3584 case NL80211_IFTYPE_AP_VLAN:
3585 case NL80211_IFTYPE_AP:
3586 /* parallel-rx requires this, at least with calls to
3587 * ieee80211_sta_ps_transition()
3588 */
3589 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
3590 goto clear;
3591 fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
3592 fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3593 fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS);
3594
3595 fastrx.internal_forward =
3596 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
3597 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
3598 !sdata->u.vlan.sta);
3599 break;
3600 default:
3601 goto clear;
3602 }
3603
3604 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3605 goto clear;
3606
3607 rcu_read_lock();
3608 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
3609 if (key) {
3610 switch (key->conf.cipher) {
3611 case WLAN_CIPHER_SUITE_TKIP:
3612 /* we don't want to deal with MMIC in fast-rx */
3613 goto clear_rcu;
3614 case WLAN_CIPHER_SUITE_CCMP:
3615 case WLAN_CIPHER_SUITE_CCMP_256:
3616 case WLAN_CIPHER_SUITE_GCMP:
3617 case WLAN_CIPHER_SUITE_GCMP_256:
3618 break;
3619 default:
3620 /* we also don't want to deal with WEP or cipher scheme
3621 * since those require looking up the key idx in the
3622 * frame, rather than assuming the PTK is used
3623 * (we need to revisit this once we implement the real
3624 * PTK index, which is now valid in the spec, but we
3625 * haven't implemented that part yet)
3626 */
3627 goto clear_rcu;
3628 }
3629
3630 fastrx.key = true;
3631 fastrx.icv_len = key->conf.icv_len;
3632 }
3633
3634 assign = true;
3635 clear_rcu:
3636 rcu_read_unlock();
3637 clear:
3638 __release(check_fast_rx);
3639
3640 if (assign)
3641 new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL);
3642
3643 spin_lock_bh(&sta->lock);
3644 old = rcu_dereference_protected(sta->fast_rx, true);
3645 rcu_assign_pointer(sta->fast_rx, new);
3646 spin_unlock_bh(&sta->lock);
3647
3648 if (old)
3649 kfree_rcu(old, rcu_head);
3650}
3651
3652void ieee80211_clear_fast_rx(struct sta_info *sta)
3653{
3654 struct ieee80211_fast_rx *old;
3655
3656 spin_lock_bh(&sta->lock);
3657 old = rcu_dereference_protected(sta->fast_rx, true);
3658 RCU_INIT_POINTER(sta->fast_rx, NULL);
3659 spin_unlock_bh(&sta->lock);
3660
3661 if (old)
3662 kfree_rcu(old, rcu_head);
3663}
3664
3665void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3666{
3667 struct ieee80211_local *local = sdata->local;
3668 struct sta_info *sta;
3669
3670 lockdep_assert_held(&local->sta_mtx);
3671
3672 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3673 if (sdata != sta->sdata &&
3674 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3675 continue;
3676 ieee80211_check_fast_rx(sta);
3677 }
3678}
3679
3680void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
3681{
3682 struct ieee80211_local *local = sdata->local;
3683
3684 mutex_lock(&local->sta_mtx);
3685 __ieee80211_check_fast_rx_iface(sdata);
3686 mutex_unlock(&local->sta_mtx);
3687}
3688
3689static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
3690 struct ieee80211_fast_rx *fast_rx)
3691{
3692 struct sk_buff *skb = rx->skb;
3693 struct ieee80211_hdr *hdr = (void *)skb->data;
3694 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3695 struct sta_info *sta = rx->sta;
3696 int orig_len = skb->len;
3697 int snap_offs = ieee80211_hdrlen(hdr->frame_control);
3698 struct {
3699 u8 snap[sizeof(rfc1042_header)];
3700 __be16 proto;
3701 } *payload __aligned(2);
3702 struct {
3703 u8 da[ETH_ALEN];
3704 u8 sa[ETH_ALEN];
3705 } addrs __aligned(2);
c9c5962b
JB		 3706 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
3707
3708 if (fast_rx->uses_rss)
3709 stats = this_cpu_ptr(sta->pcpu_rx_stats);
49ddf8e6
JB		 3710
3711 /* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write
3712 * to a common data structure; drivers can implement that per queue
3713 * but we don't have that information in mac80211
3714 */
3715 if (!(status->flag & RX_FLAG_DUP_VALIDATED))
3716 return false;
3717
3718#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED)
3719
3720 /* If using encryption, we also need to have:
3721 * - PN_VALIDATED: similar, but the implementation is tricky
3722 * - DECRYPTED: necessary for PN_VALIDATED
3723 */
3724 if (fast_rx->key &&
3725 (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
3726 return false;
3727
3728 /* we don't deal with A-MSDU deaggregation here */
3729 if (status->rx_flags & IEEE80211_RX_AMSDU)
3730 return false;
3731
3732 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
3733 return false;
3734
3735 if (unlikely(ieee80211_is_frag(hdr)))
3736 return false;
3737
3738 /* Since our interface address cannot be multicast, this
3739 * implicitly also rejects multicast frames without the
3740 * explicit check.
3741 *
3742 * We shouldn't get any *data* frames not addressed to us
3743 * (AP mode will accept multicast *management* frames), but
3744 * punting here will make it go through the full checks in
3745 * ieee80211_accept_frame().
3746 */
3747 if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1))
3748 return false;
3749
3750 if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
3751 IEEE80211_FCTL_TODS)) !=
3752 fast_rx->expected_ds_bits)
3753 goto drop;
3754
3755 /* assign the key to drop unencrypted frames (later)
3756 * and strip the IV/MIC if necessary
3757 */
3758 if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
3759 /* GCMP header length is the same */
3760 snap_offs += IEEE80211_CCMP_HDR_LEN;
3761 }
3762
3763 if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
3764 goto drop;
3765 payload = (void *)(skb->data + snap_offs);
3766
3767 if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
3768 return false;
3769
3770 /* Don't handle these here since they require special code.
3771 * Accept AARP and IPX even though they should come with a
3772 * bridge-tunnel header - but if we get them this way then
3773 * there's little point in discarding them.
3774 */
3775 if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
3776 payload->proto == fast_rx->control_port_protocol))
3777 return false;
3778
3779 /* after this point, don't punt to the slowpath! */
3780
3781 if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) &&
3782 pskb_trim(skb, skb->len - fast_rx->icv_len))
3783 goto drop;
3784
3785 if (unlikely(fast_rx->sta_notify)) {
3786 ieee80211_sta_rx_notify(rx->sdata, hdr);
3787 fast_rx->sta_notify = false;
3788 }
3789
3790 /* statistics part of ieee80211_rx_h_sta_process() */
c9c5962b
JB		 3791 stats->last_rx = jiffies;
3792 stats->last_rate = sta_stats_encode_rate(status);
49ddf8e6 3793
c9c5962b 3794 stats->fragments++;
49ddf8e6
JB		 3795
3796 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
c9c5962b
JB		 3797 stats->last_signal = status->signal;
3798 if (!fast_rx->uses_rss)
3799 ewma_signal_add(&sta->rx_stats_avg.signal,
3800 -status->signal);
49ddf8e6
JB		 3801 }
3802
3803 if (status->chains) {
3804 int i;
3805
c9c5962b 3806 stats->chains = status->chains;
49ddf8e6
JB		 3807 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
3808 int signal = status->chain_signal[i];
3809
3810 if (!(status->chains & BIT(i)))
3811 continue;
3812
c9c5962b
JB		 3813 stats->chain_signal_last[i] = signal;
3814 if (!fast_rx->uses_rss)
3815 ewma_signal_add(&sta->rx_stats_avg.chain_signal[i],
3816 -signal);
49ddf8e6
JB		 3817 }
3818 }
3819 /* end of statistics */
3820
3821 if (rx->key && !ieee80211_has_protected(hdr->frame_control))
3822 goto drop;
3823
3824 /* do the header conversion - first grab the addresses */
3825 ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
3826 ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
3827 /* remove the SNAP but leave the ethertype */
3828 skb_pull(skb, snap_offs + sizeof(rfc1042_header));
3829 /* push the addresses in front */
3830 memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
3831
3832 skb->dev = fast_rx->dev;
3833
3834 ieee80211_rx_stats(fast_rx->dev, skb->len);
3835
3836 /* The seqno index has the same property as needed
3837 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
3838 * for non-QoS-data frames. Here we know it's a data
3839 * frame, so count MSDUs.
3840 */
c9c5962b
JB		 3841 u64_stats_update_begin(&stats->syncp);
3842 stats->msdu[rx->seqno_idx]++;
3843 stats->bytes += orig_len;
3844 u64_stats_update_end(&stats->syncp);
49ddf8e6
JB		 3845
3846 if (fast_rx->internal_forward) {
3847 struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
3848
3849 if (dsta) {
3850 /*
3851 * Send to wireless media and increase priority by 256
3852 * to keep the received priority instead of
3853 * reclassifying the frame (see cfg80211_classify8021d).
3854 */
3855 skb->priority += 256;
3856 skb->protocol = htons(ETH_P_802_3);
3857 skb_reset_network_header(skb);
3858 skb_reset_mac_header(skb);
3859 dev_queue_xmit(skb);
3860 return true;
3861 }
3862 }
3863
3864 /* deliver to local stack */
3865 skb->protocol = eth_type_trans(skb, fast_rx->dev);
3866 memset(skb->cb, 0, sizeof(skb->cb));
3867 if (rx->napi)
3868 napi_gro_receive(rx->napi, skb);
3869 else
3870 netif_receive_skb(skb);
3871
3872 return true;
3873 drop:
3874 dev_kfree_skb(skb);
c9c5962b 3875 stats->dropped++;
49ddf8e6
JB		 3876 return true;
3877}
3878
4406c376
JB		 3879/*
3880 * This function returns whether or not the SKB
3881 * was destined for RX processing or not, which,
3882 * if consume is true, is equivalent to whether
3883 * or not the skb was consumed.
3884 */
3885static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3886 struct sk_buff *skb, bool consume)
3887{
3888 struct ieee80211_local *local = rx->local;
3889 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 3890
3891 rx->skb = skb;
4406c376 3892
49ddf8e6
JB		 3893 /* See if we can do fast-rx; if we have to copy we already lost,
3894 * so punt in that case. We should never have to deliver a data
3895 * frame to multiple interfaces anyway.
3896 *
3897 * We skip the ieee80211_accept_frame() call and do the necessary
3898 * checking inside ieee80211_invoke_fast_rx().
3899 */
3900 if (consume && rx->sta) {
3901 struct ieee80211_fast_rx *fast_rx;
3902
3903 fast_rx = rcu_dereference(rx->sta->fast_rx);
3904 if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx))
3905 return true;
3906 }
3907
a58fbe1a 3908 if (!ieee80211_accept_frame(rx))
4406c376
JB		 3909 return false;
3910
4406c376
JB		 3911 if (!consume) {
3912 skb = skb_copy(skb, GFP_ATOMIC);
3913 if (!skb) {
3914 if (net_ratelimit())
3915 wiphy_debug(local->hw.wiphy,
b305dae4 3916 "failed to copy skb for %s\n",
4406c376
JB		 3917 sdata->name);
3918 return true;
3919 }
3920
3921 rx->skb = skb;
3922 }
3923
3924 ieee80211_invoke_rx_handlers(rx);
3925 return true;
3926}
3927
571ecf67 3928/*
6b59db7d 3929 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3930 * be called with rcu_read_lock protection.
571ecf67 3931 */
71ebb4aa 3932static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
d63b548f 3933 struct ieee80211_sta *pubsta,
af9f9b22
JB		 3934 struct sk_buff *skb,
3935 struct napi_struct *napi)
571ecf67
JB		 3936{
3937 struct ieee80211_local *local = hw_to_local(hw);
3938 struct ieee80211_sub_if_data *sdata;
571ecf67 3939 struct ieee80211_hdr *hdr;
e3cf8b3f 3940 __le16 fc;
5cf121c3 3941 struct ieee80211_rx_data rx;
4406c376 3942 struct ieee80211_sub_if_data *prev;
7bedd0cf 3943 struct rhash_head *tmp;
e3cf8b3f 3944 int err = 0;
571ecf67 3945
e3cf8b3f 3946 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3947 memset(&rx, 0, sizeof(rx));
3948 rx.skb = skb;
3949 rx.local = local;
af9f9b22 3950 rx.napi = napi;
72abd81b 3951
e3cf8b3f 3952 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 3953 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 3954
4a4f1a58
JB		 3955 if (ieee80211_is_mgmt(fc)) {
3956 /* drop frame if too short for header */
3957 if (skb->len < ieee80211_hdrlen(fc))
3958 err = -ENOBUFS;
3959 else
3960 err = skb_linearize(skb);
3961 } else {
e3cf8b3f 3962 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3963 }
e3cf8b3f
ZY		 3964
3965 if (err) {
3966 dev_kfree_skb(skb);
3967 return;
3968 }
3969
3970 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3971 ieee80211_parse_qos(&rx);
d1c3a37c 3972 ieee80211_verify_alignment(&rx);
38f3714d 3973
d48b2968
JB		 3974 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3975 ieee80211_is_beacon(hdr->frame_control)))
3976 ieee80211_scan_rx(local, skb);
3977
d63b548f
JB		 3978 if (pubsta) {
3979 rx.sta = container_of(pubsta, struct sta_info, sta);
3980 rx.sdata = rx.sta->sdata;
3981 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3982 return;
3983 goto out;
3984 } else if (ieee80211_is_data(fc)) {
3985 struct sta_info *sta, *prev_sta;
7bedd0cf
JB		 3986 const struct bucket_table *tbl;
3987
56af3268 3988 prev_sta = NULL;
4406c376 3989
7bedd0cf
JB		 3990 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3991
3992 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
56af3268
BG		 3993 if (!prev_sta) {
3994 prev_sta = sta;
3995 continue;
3996 }
3997
3998 rx.sta = prev_sta;
3999 rx.sdata = prev_sta->sdata;
4406c376 4000 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 4001
56af3268 4002 prev_sta = sta;
4406c376 4003 }
56af3268
BG		 4004
4005 if (prev_sta) {
4006 rx.sta = prev_sta;
4007 rx.sdata = prev_sta->sdata;
4008
4406c376 4009 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 4010 return;
8e26d5ad 4011 goto out;
56af3268 4012 }
4406c376
JB		 4013 }
4014
4b0dd98e 4015 prev = NULL;
b2e7771e 4016
4b0dd98e
JB		 4017 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4018 if (!ieee80211_sdata_running(sdata))
4019 continue;
340e11f3 4020
4b0dd98e
JB		 4021 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
4022 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4023 continue;
340e11f3 4024
4b0dd98e
JB		 4025 /*
4026 * frame is destined for this interface, but if it's
4027 * not also for the previous one we handle that after
4028 * the loop to avoid copying the SKB once too much
4029 */
4bb29f8c 4030
4b0dd98e 4031 if (!prev) {
abe60632 4032 prev = sdata;
4b0dd98e 4033 continue;
340e11f3 4034 }
4bb29f8c 4035
7852e361 4036 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 4037 rx.sdata = prev;
4038 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 4039
4b0dd98e
JB		 4040 prev = sdata;
4041 }
4042
4043 if (prev) {
7852e361 4044 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 4045 rx.sdata = prev;
4406c376 4046
4b0dd98e
JB		 4047 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
4048 return;
571ecf67 4049 }
4406c376 4050
8e26d5ad 4051 out:
4406c376 4052 dev_kfree_skb(skb);
571ecf67 4053}
6368e4b1
RR		 4054
4055/*
4056 * This is the receive path handler. It is called by a low level driver when an
4057 * 802.11 MPDU is received from the hardware.
4058 */
d63b548f
JB		 4059void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
4060 struct sk_buff *skb, struct napi_struct *napi)
6368e4b1
RR		 4061{
4062 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 4063 struct ieee80211_rate *rate = NULL;
4064 struct ieee80211_supported_band *sband;
f1d58c25 4065 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 4066
d20ef63d
JB		 4067 WARN_ON_ONCE(softirq_count() == 0);
4068
57fbcce3 4069 if (WARN_ON(status->band >= NUM_NL80211_BANDS))
77a980dc 4070 goto drop;
8318d78a
JB		 4071
4072 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 4073 if (WARN_ON(!sband))
4074 goto drop;
8318d78a 4075
89c3a8ac
JB		 4076 /*
4077 * If we're suspending, it is possible although not too likely
4078 * that we'd be receiving frames after having already partially
4079 * quiesced the stack. We can't process such frames then since
4080 * that might, for example, cause stations to be added or other
4081 * driver callbacks be invoked.
4082 */
77a980dc
JB		 4083 if (unlikely(local->quiescing || local->suspended))
4084 goto drop;
89c3a8ac 4085
04800ada
AN		 4086 /* We might be during a HW reconfig, prevent Rx for the same reason */
4087 if (unlikely(local->in_reconfig))
4088 goto drop;
4089
ea77f12f
JB		 4090 /*
4091 * The same happens when we're not even started,
4092 * but that's worth a warning.
4093 */
77a980dc
JB		 4094 if (WARN_ON(!local->started))
4095 goto drop;
ea77f12f 4096
fc885189 4097 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 4098 /*
fc885189
JB		 4099 * Validate the rate, unless a PLCP error means that
4100 * we probably can't have a valid rate here anyway.
e5d6eb83 4101 */
fc885189
JB		 4102
4103 if (status->flag & RX_FLAG_HT) {
4104 /*
4105 * rate_idx is MCS index, which can be [0-76]
4106 * as documented on:
4107 *
4108 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
4109 *
4110 * Anything else would be some sort of driver or
4111 * hardware error. The driver should catch hardware
4112 * errors.
4113 */
444e3803 4114 if (WARN(status->rate_idx > 76,
fc885189
JB		 4115 "Rate marked as an HT rate but passed "
4116 "status->rate_idx is not "
4117 "an MCS index [0-76]: %d (0x%02x)\n",
4118 status->rate_idx,
4119 status->rate_idx))
4120 goto drop;
5614618e
JB		 4121 } else if (status->flag & RX_FLAG_VHT) {
4122 if (WARN_ONCE(status->rate_idx > 9 ||
4123 !status->vht_nss ||
4124 status->vht_nss > 8,
4125 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
4126 status->rate_idx, status->vht_nss))
4127 goto drop;
fc885189 4128 } else {
444e3803 4129 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 4130 goto drop;
4131 rate = &sband->bitrates[status->rate_idx];
4132 }
0fb8ca45 4133 }
6368e4b1 4134
554891e6
JB		 4135 status->rx_flags = 0;
4136
6368e4b1
RR		 4137 /*
4138 * key references and virtual interfaces are protected using RCU
4139 * and this requires that we are in a read-side RCU section during
4140 * receive processing
4141 */
4142 rcu_read_lock();
4143
4144 /*
4145 * Frames with failed FCS/PLCP checksum are not returned,
4146 * all other frames are returned without radiotap header
4147 * if it was previously present.
4148 * Also, frames with less than 16 bytes are dropped.
4149 */
f1d58c25 4150 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 4151 if (!skb) {
4152 rcu_read_unlock();
4153 return;
4154 }
4155
e1e54068
JB		 4156 ieee80211_tpt_led_trig_rx(local,
4157 ((struct ieee80211_hdr *)skb->data)->frame_control,
4158 skb->len);
d63b548f
JB		 4159
4160 __ieee80211_rx_handle_packet(hw, pubsta, skb, napi);
6368e4b1
RR		 4161
4162 rcu_read_unlock();
77a980dc
JB		 4163
4164 return;
4165 drop:
4166 kfree_skb(skb);
6368e4b1 4167}
af9f9b22 4168EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 4169
4170/* This is a version of the rx handler that can be called from hard irq
4171 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 4172void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 4173{
4174 struct ieee80211_local *local = hw_to_local(hw);
4175
4176 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4177
571ecf67
JB		 4178 skb->pkt_type = IEEE80211_RX_MSG;
4179 skb_queue_tail(&local->skb_queue, skb);
4180 tasklet_schedule(&local->tasklet);
4181}
4182EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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