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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
571ecf67
JB		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
ab46623e 13#include <linux/jiffies.h>
5a0e3ad6 14#include <linux/slab.h>
571ecf67
JB		 15#include <linux/kernel.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
d4e46a3d 19#include <linux/rcupdate.h>
bc3b2d7f 20#include <linux/export.h>
571ecf67
JB		 21#include <net/mac80211.h>
22#include <net/ieee80211_radiotap.h>
d26ad377 23#include <asm/unaligned.h>
571ecf67
JB		 24
25#include "ieee80211_i.h"
24487981 26#include "driver-ops.h"
2c8dccc7 27#include "led.h"
33b64eb2 28#include "mesh.h"
571ecf67
JB		 29#include "wep.h"
30#include "wpa.h"
31#include "tkip.h"
32#include "wme.h"
1d8d3dec 33#include "rate.h"
571ecf67 34
5a490510
JB		 35static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
36{
37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
38
39 u64_stats_update_begin(&tstats->syncp);
40 tstats->rx_packets++;
41 tstats->rx_bytes += len;
42 u64_stats_update_end(&tstats->syncp);
43}
44
a6828493
JB		 45static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
47{
48 __le16 fc = hdr->frame_control;
49
50 if (ieee80211_is_data(fc)) {
51 if (len < 24) /* drop incorrect hdr len (data) */
52 return NULL;
53
54 if (ieee80211_has_a4(fc))
55 return NULL;
56 if (ieee80211_has_tods(fc))
57 return hdr->addr1;
58 if (ieee80211_has_fromds(fc))
59 return hdr->addr2;
60
61 return hdr->addr3;
62 }
63
64 if (ieee80211_is_mgmt(fc)) {
65 if (len < 24) /* drop incorrect hdr len (mgmt) */
66 return NULL;
67 return hdr->addr3;
68 }
69
70 if (ieee80211_is_ctl(fc)) {
71 if (ieee80211_is_pspoll(fc))
72 return hdr->addr1;
73
74 if (ieee80211_is_back_req(fc)) {
75 switch (type) {
76 case NL80211_IFTYPE_STATION:
77 return hdr->addr2;
78 case NL80211_IFTYPE_AP:
79 case NL80211_IFTYPE_AP_VLAN:
80 return hdr->addr1;
81 default:
82 break; /* fall through to the return */
83 }
84 }
85 }
86
87 return NULL;
88}
89
b2e7771e
JB		 90/*
91 * monitor mode reception
92 *
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
95 */
96static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
1f7bba79
JB		 97 struct sk_buff *skb,
98 unsigned int rtap_vendor_space)
b2e7771e 99{
30686bf7 100 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
b2e7771e 101 if (likely(skb->len > FCS_LEN))
e3cf8b3f 102 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 103 else {
104 /* driver bug */
105 WARN_ON(1);
106 dev_kfree_skb(skb);
0624760c 107 return NULL;
b2e7771e
JB		 108 }
109 }
110
1f7bba79
JB		 111 __pskb_pull(skb, rtap_vendor_space);
112
b2e7771e
JB		 113 return skb;
114}
115
1f7bba79
JB		 116static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
117 unsigned int rtap_vendor_space)
b2e7771e 118{
f1d58c25 119 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 120 struct ieee80211_hdr *hdr;
121
122 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 123
4c298677 124 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
0c028b5f 125 RX_FLAG_FAILED_PLCP_CRC))
6b59db7d
ZG		 126 return true;
127
1f7bba79 128 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 129 return true;
130
87228f57
HH		 131 if (ieee80211_is_ctl(hdr->frame_control) &&
132 !ieee80211_is_pspoll(hdr->frame_control) &&
133 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 134 return true;
135
136 return false;
b2e7771e
JB		 137}
138
601ae7f2 139static int
1f7bba79
JB		 140ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
141 struct ieee80211_rx_status *status,
142 struct sk_buff *skb)
601ae7f2
BR		 143{
144 int len;
145
146 /* always present fields */
a144f378 147 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 148
a144f378 149 /* allocate extra bitmaps */
a144f378
JB		 150 if (status->chains)
151 len += 4 * hweight8(status->chains);
90b9e446
JB		 152
153 if (ieee80211_have_rx_timestamp(status)) {
154 len = ALIGN(len, 8);
601ae7f2 155 len += 8;
90b9e446 156 }
30686bf7 157 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
601ae7f2 158 len += 1;
601ae7f2 159
a144f378
JB		 160 /* antenna field, if we don't have per-chain info */
161 if (!status->chains)
162 len += 1;
163
90b9e446
JB		 164 /* padding for RX_FLAGS if necessary */
165 len = ALIGN(len, 2);
601ae7f2 166
6d744bac
JB		 167 if (status->flag & RX_FLAG_HT) /* HT info */
168 len += 3;
169
4c298677 170 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 171 len = ALIGN(len, 4);
4c298677
JB		 172 len += 8;
173 }
174
51648921
JB		 175 if (status->flag & RX_FLAG_VHT) {
176 len = ALIGN(len, 2);
177 len += 12;
178 }
179
a144f378
JB		 180 if (status->chains) {
181 /* antenna and antenna signal fields */
182 len += 2 * hweight8(status->chains);
183 }
184
1f7bba79
JB		 185 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
186 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
187
188 /* vendor presence bitmap */
189 len += 4;
190 /* alignment for fixed 6-byte vendor data header */
191 len = ALIGN(len, 2);
192 /* vendor data header */
193 len += 6;
194 if (WARN_ON(rtap->align == 0))
195 rtap->align = 1;
196 len = ALIGN(len, rtap->align);
197 len += rtap->len + rtap->pad;
198 }
199
601ae7f2
BR		 200 return len;
201}
202
00ea6deb 203/*
601ae7f2
BR		 204 * ieee80211_add_rx_radiotap_header - add radiotap header
205 *
206 * add a radiotap header containing all the fields which the hardware provided.
207 */
208static void
209ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
210 struct sk_buff *skb,
601ae7f2 211 struct ieee80211_rate *rate,
973ef21a 212 int rtap_len, bool has_fcs)
601ae7f2 213{
f1d58c25 214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 215 struct ieee80211_radiotap_header *rthdr;
216 unsigned char *pos;
a144f378
JB		 217 __le32 *it_present;
218 u32 it_present_val;
6a86b9c7 219 u16 rx_flags = 0;
a5e70697 220 u16 channel_flags = 0;
a144f378
JB		 221 int mpdulen, chain;
222 unsigned long chains = status->chains;
1f7bba79
JB		 223 struct ieee80211_vendor_radiotap rtap = {};
224
225 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
226 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
227 /* rtap.len and rtap.pad are undone immediately */
228 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
229 }
f4bda337
TP		 230
231 mpdulen = skb->len;
30686bf7 232 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
f4bda337 233 mpdulen += FCS_LEN;
601ae7f2
BR		 234
235 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 236 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 237 it_present = &rthdr->it_present;
601ae7f2
BR		 238
239 /* radiotap header, set always present flags */
0059b2b1 240 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 241 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
242 BIT(IEEE80211_RADIOTAP_CHANNEL) |
243 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
244
245 if (!status->chains)
246 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
247
248 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
249 it_present_val |=
250 BIT(IEEE80211_RADIOTAP_EXT) |
251 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
252 put_unaligned_le32(it_present_val, it_present);
253 it_present++;
254 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
255 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
256 }
601ae7f2 257
1f7bba79
JB		 258 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
259 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
260 BIT(IEEE80211_RADIOTAP_EXT);
261 put_unaligned_le32(it_present_val, it_present);
262 it_present++;
263 it_present_val = rtap.present;
264 }
265
a144f378
JB		 266 put_unaligned_le32(it_present_val, it_present);
267
268 pos = (void *)(it_present + 1);
269
601ae7f2
BR		 270 /* the order of the following fields is important */
271
272 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 273 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 274 /* padding */
275 while ((pos - (u8 *)rthdr) & 7)
276 *pos++ = 0;
f4bda337
TP		 277 put_unaligned_le64(
278 ieee80211_calculate_rx_timestamp(local, status,
279 mpdulen, 0),
280 pos);
1df332e8 281 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 282 pos += 8;
283 }
284
285 /* IEEE80211_RADIOTAP_FLAGS */
30686bf7 286 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
601ae7f2 287 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 288 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
289 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 290 if (status->flag & RX_FLAG_SHORTPRE)
291 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 292 pos++;
293
294 /* IEEE80211_RADIOTAP_RATE */
5614618e 295 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 296 /*
f8d1ccf1 297 * Without rate information don't add it. If we have,
38f37be2 298 * MCS information is a separate field in radiotap,
73b48099
JB		 299 * added below. The byte here is needed as padding
300 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 301 */
302 *pos = 0;
8d6f658e 303 } else {
2103dec1 304 int shift = 0;
ebe6c7ba 305 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 306 if (status->flag & RX_FLAG_10MHZ)
307 shift = 1;
308 else if (status->flag & RX_FLAG_5MHZ)
309 shift = 2;
310 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 311 }
601ae7f2
BR		 312 pos++;
313
314 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 315 put_unaligned_le16(status->freq, pos);
601ae7f2 316 pos += 2;
a5e70697
SW		 317 if (status->flag & RX_FLAG_10MHZ)
318 channel_flags |= IEEE80211_CHAN_HALF;
319 else if (status->flag & RX_FLAG_5MHZ)
320 channel_flags |= IEEE80211_CHAN_QUARTER;
321
601ae7f2 322 if (status->band == IEEE80211_BAND_5GHZ)
a5e70697 323 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 324 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 325 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 326 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 327 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 328 else if (rate)
3a5c5e81 329 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
f8d1ccf1 330 else
a5e70697
SW		 331 channel_flags |= IEEE80211_CHAN_2GHZ;
332 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 333 pos += 2;
334
335 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
30686bf7 336 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
fe8431f8 337 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 338 *pos = status->signal;
339 rthdr->it_present |=
340 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
341 pos++;
342 }
343
601ae7f2
BR		 344 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
345
a144f378
JB		 346 if (!status->chains) {
347 /* IEEE80211_RADIOTAP_ANTENNA */
348 *pos = status->antenna;
349 pos++;
350 }
601ae7f2 351
601ae7f2
BR		 352 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
353
354 /* IEEE80211_RADIOTAP_RX_FLAGS */
355 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 356 if ((pos - (u8 *)rthdr) & 1)
90b9e446 357 *pos++ = 0;
aae89831 358 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 359 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
360 put_unaligned_le16(rx_flags, pos);
601ae7f2 361 pos += 2;
6d744bac
JB		 362
363 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 364 unsigned int stbc;
365
6d744bac 366 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 367 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 368 *pos = 0;
369 if (status->flag & RX_FLAG_SHORT_GI)
370 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
371 if (status->flag & RX_FLAG_40MHZ)
372 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 373 if (status->flag & RX_FLAG_HT_GF)
374 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
63c361f5
EG		 375 if (status->flag & RX_FLAG_LDPC)
376 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
786677d1
OR		 377 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
378 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 379 pos++;
380 *pos++ = status->rate_idx;
381 }
4c298677
JB		 382
383 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
384 u16 flags = 0;
385
386 /* ensure 4 byte alignment */
387 while ((pos - (u8 *)rthdr) & 3)
388 pos++;
389 rthdr->it_present |=
390 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
391 put_unaligned_le32(status->ampdu_reference, pos);
392 pos += 4;
4c298677
JB		 393 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
394 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
395 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
396 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
397 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
398 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
399 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
400 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
401 put_unaligned_le16(flags, pos);
402 pos += 2;
403 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
404 *pos++ = status->ampdu_delimiter_crc;
405 else
406 *pos++ = 0;
407 *pos++ = 0;
408 }
90b9e446 409
51648921
JB		 410 if (status->flag & RX_FLAG_VHT) {
411 u16 known = local->hw.radiotap_vht_details;
412
413 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
51648921
JB		 414 put_unaligned_le16(known, pos);
415 pos += 2;
416 /* flags */
417 if (status->flag & RX_FLAG_SHORT_GI)
418 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 419 /* in VHT, STBC is binary */
420 if (status->flag & RX_FLAG_STBC_MASK)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 422 if (status->vht_flag & RX_VHT_FLAG_BF)
423 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 424 pos++;
425 /* bandwidth */
1b8d242a 426 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 427 *pos++ = 4;
1b8d242a 428 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 429 *pos++ = 11;
430 else if (status->flag & RX_FLAG_40MHZ)
431 *pos++ = 1;
432 else /* 20 MHz */
433 *pos++ = 0;
434 /* MCS/NSS */
435 *pos = (status->rate_idx << 4) | status->vht_nss;
436 pos += 4;
437 /* coding field */
63c361f5
EG		 438 if (status->flag & RX_FLAG_LDPC)
439 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 440 pos++;
441 /* group ID */
442 pos++;
443 /* partial_aid */
444 pos += 2;
445 }
446
a144f378
JB		 447 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
448 *pos++ = status->chain_signal[chain];
449 *pos++ = chain;
450 }
1f7bba79
JB		 451
452 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
453 /* ensure 2 byte alignment for the vendor field as required */
454 if ((pos - (u8 *)rthdr) & 1)
455 *pos++ = 0;
456 *pos++ = rtap.oui[0];
457 *pos++ = rtap.oui[1];
458 *pos++ = rtap.oui[2];
459 *pos++ = rtap.subns;
460 put_unaligned_le16(rtap.len, pos);
461 pos += 2;
462 /* align the actual payload as requested */
463 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
464 *pos++ = 0;
465 /* data (and possible padding) already follows */
466 }
601ae7f2
BR		 467}
468
b2e7771e
JB		 469/*
470 * This function copies a received frame to all monitor interfaces and
471 * returns a cleaned-up SKB that no longer includes the FCS nor the
472 * radiotap header the driver might have added.
473 */
474static struct sk_buff *
475ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 476 struct ieee80211_rate *rate)
b2e7771e 477{
f1d58c25 478 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 479 struct ieee80211_sub_if_data *sdata;
1f7bba79 480 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 481 struct sk_buff *skb, *skb2;
482 struct net_device *prev_dev = NULL;
483 int present_fcs_len = 0;
1f7bba79
JB		 484 unsigned int rtap_vendor_space = 0;
485
486 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
487 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
488
489 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
490 }
b2e7771e
JB		 491
492 /*
493 * First, we may need to make a copy of the skb because
494 * (1) we need to modify it for radiotap (if not present), and
495 * (2) the other RX handlers will modify the skb we got.
496 *
497 * We don't need to, of course, if we aren't going to return
498 * the SKB because it has a bad FCS/PLCP checksum.
499 */
0869aea0 500
30686bf7 501 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
b2e7771e
JB		 502 present_fcs_len = FCS_LEN;
503
1f7bba79
JB		 504 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
505 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 506 dev_kfree_skb(origskb);
507 return NULL;
508 }
509
b2e7771e 510 if (!local->monitors) {
1f7bba79
JB		 511 if (should_drop_frame(origskb, present_fcs_len,
512 rtap_vendor_space)) {
b2e7771e
JB		 513 dev_kfree_skb(origskb);
514 return NULL;
515 }
516
1f7bba79 517 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 518 }
519
751413ea 520 /* room for the radiotap header based on driver features */
1f7bba79
JB		 521 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
522 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 523
1f7bba79 524 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 525 /* only need to expand headroom if necessary */
526 skb = origskb;
527 origskb = NULL;
528
529 /*
530 * This shouldn't trigger often because most devices have an
531 * RX header they pull before we get here, and that should
532 * be big enough for our radiotap information. We should
533 * probably export the length to drivers so that we can have
534 * them allocate enough headroom to start with.
535 */
536 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 537 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 538 dev_kfree_skb(skb);
539 return NULL;
540 }
541 } else {
542 /*
543 * Need to make a copy and possibly remove radiotap header
544 * and FCS from the original.
545 */
546 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
547
1f7bba79
JB		 548 origskb = remove_monitor_info(local, origskb,
549 rtap_vendor_space);
b2e7771e
JB		 550
551 if (!skb)
552 return origskb;
553 }
554
0869aea0 555 /* prepend radiotap information */
1f7bba79 556 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 557
ce3edf6d 558 skb_reset_mac_header(skb);
b2e7771e
JB		 559 skb->ip_summed = CHECKSUM_UNNECESSARY;
560 skb->pkt_type = PACKET_OTHERHOST;
561 skb->protocol = htons(ETH_P_802_2);
562
563 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 564 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 565 continue;
566
3d30d949
MW		 567 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
568 continue;
569
9607e6b6 570 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 571 continue;
572
b2e7771e
JB		 573 if (prev_dev) {
574 skb2 = skb_clone(skb, GFP_ATOMIC);
575 if (skb2) {
576 skb2->dev = prev_dev;
5548a8a1 577 netif_receive_skb(skb2);
b2e7771e
JB		 578 }
579 }
580
581 prev_dev = sdata->dev;
5a490510 582 ieee80211_rx_stats(sdata->dev, skb->len);
b2e7771e
JB		 583 }
584
585 if (prev_dev) {
586 skb->dev = prev_dev;
5548a8a1 587 netif_receive_skb(skb);
b2e7771e
JB		 588 } else
589 dev_kfree_skb(skb);
590
591 return origskb;
592}
593
5cf121c3 594static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 595{
238f74a2 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 597 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 598 int tid, seqno_idx, security_idx;
6e0d114d
JB		 599
600 /* does the frame have a qos control field? */
238f74a2
HH		 601 if (ieee80211_is_data_qos(hdr->frame_control)) {
602 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 603 /* frame has qos control */
238f74a2 604 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 605 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 606 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 607
608 seqno_idx = tid;
609 security_idx = tid;
6e0d114d 610 } else {
1411f9b5
JB		 611 /*
612 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
613 *
614 * Sequence numbers for management frames, QoS data
615 * frames with a broadcast/multicast address in the
616 * Address 1 field, and all non-QoS data frames sent
617 * by QoS STAs are assigned using an additional single
618 * modulo-4096 counter, [...]
619 *
620 * We also use that counter for non-QoS STAs.
621 */
5a306f58 622 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 623 security_idx = 0;
624 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 625 security_idx = IEEE80211_NUM_TIDS;
9e26297a 626 tid = 0;
6e0d114d 627 }
52865dfd 628
9e26297a
JB		 629 rx->seqno_idx = seqno_idx;
630 rx->security_idx = security_idx;
6e0d114d
JB		 631 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
632 * For now, set skb->priority to 0 for other cases. */
633 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 634}
6e0d114d 635
d1c3a37c
JB		 636/**
637 * DOC: Packet alignment
638 *
639 * Drivers always need to pass packets that are aligned to two-byte boundaries
640 * to the stack.
641 *
642 * Additionally, should, if possible, align the payload data in a way that
643 * guarantees that the contained IP header is aligned to a four-byte
644 * boundary. In the case of regular frames, this simply means aligning the
645 * payload to a four-byte boundary (because either the IP header is directly
646 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 647 * in front of it). If the payload data is not properly aligned and the
648 * architecture doesn't support efficient unaligned operations, mac80211
649 * will align the data.
d1c3a37c
JB		 650 *
651 * With A-MSDU frames, however, the payload data address must yield two modulo
652 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
653 * push the IP header further back to a multiple of four again. Thankfully, the
654 * specs were sane enough this time around to require padding each A-MSDU
655 * subframe to a length that is a multiple of four.
656 *
25985edc 657 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 658 * the payload is not supported, the driver is required to move the 802.11
659 * header to be directly in front of the payload in that case.
660 */
661static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 662{
59d9cb07
KV		 663#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
664 WARN_ONCE((unsigned long)rx->skb->data & 1,
665 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 666#endif
6e0d114d
JB		 667}
668
6368e4b1 669
571ecf67
JB		 670/* rx handlers */
671
3cfcf6ac
JM		 672static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
673{
674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
675
d8ca16db 676 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 677 return 0;
678
d8ca16db 679 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 680}
681
682
683static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
684{
685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
686
d8ca16db 687 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 688 return 0;
689
d8ca16db 690 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 691}
692
693
694/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
695static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
696{
697 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
698 struct ieee80211_mmie *mmie;
56c52da2 699 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 700
1df332e8 701 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 702 return -1;
703
d8ca16db 704 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 705 return -1; /* not a robust management frame */
706
707 mmie = (struct ieee80211_mmie *)
708 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 709 if (mmie->element_id == WLAN_EID_MMIE &&
710 mmie->length == sizeof(*mmie) - 2)
711 return le16_to_cpu(mmie->key_id);
712
713 mmie16 = (struct ieee80211_mmie_16 *)
714 (skb->data + skb->len - sizeof(*mmie16));
715 if (skb->len >= 24 + sizeof(*mmie16) &&
716 mmie16->element_id == WLAN_EID_MMIE &&
717 mmie16->length == sizeof(*mmie16) - 2)
718 return le16_to_cpu(mmie16->key_id);
719
720 return -1;
3cfcf6ac
JM		 721}
722
2475b1cc
MS		 723static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
724 struct sk_buff *skb)
725{
726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
727 __le16 fc;
728 int hdrlen;
729 u8 keyid;
730
731 fc = hdr->frame_control;
732 hdrlen = ieee80211_hdrlen(fc);
733
734 if (skb->len < hdrlen + cs->hdr_len)
735 return -EINVAL;
736
737 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
738 keyid &= cs->key_idx_mask;
739 keyid >>= cs->key_idx_shift;
740
741 return keyid;
742}
743
1df332e8 744static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 745{
a7767f95 746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 747 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 748
a7767f95 749 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 750 if (is_multicast_ether_addr(hdr->addr1)) {
751 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 752 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 753 return RX_DROP_MONITOR;
b203ca39 754 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 755 return RX_DROP_MONITOR;
756 } else {
757 if (!ieee80211_has_a4(hdr->frame_control))
758 return RX_DROP_MONITOR;
b203ca39 759 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 760 return RX_DROP_MONITOR;
761 }
33b64eb2
LCC		 762 }
763
764 /* If there is not an established peer link and this is not a peer link
765 * establisment frame, beacon or probe, drop the frame.
766 */
767
57cf8043 768 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 769 struct ieee80211_mgmt *mgmt;
d6d1a5a7 770
a7767f95 771 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 772 return RX_DROP_MONITOR;
773
a7767f95 774 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 775 u8 category;
9b395bc3
JB		 776
777 /* make sure category field is present */
778 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
779 return RX_DROP_MONITOR;
780
33b64eb2 781 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 782 category = mgmt->u.action.category;
783 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 784 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 785 return RX_DROP_MONITOR;
33b64eb2 786 return RX_CONTINUE;
33b64eb2
LCC		 787 }
788
a7767f95
HH		 789 if (ieee80211_is_probe_req(hdr->frame_control) ||
790 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 791 ieee80211_is_beacon(hdr->frame_control) ||
792 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 793 return RX_CONTINUE;
794
795 return RX_DROP_MONITOR;
a7767f95
HH		 796 }
797
902acc78
JB		 798 return RX_CONTINUE;
799}
33b64eb2 800
d3b2fb53 801static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 802 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 803 int index,
804 struct sk_buff_head *frames)
1edfb1af 805{
83eb935e
MK		 806 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
807 struct sk_buff *skb;
4cfda47b 808 struct ieee80211_rx_status *status;
1edfb1af 809
dd318575
JB		 810 lockdep_assert_held(&tid_agg_rx->reorder_lock);
811
83eb935e 812 if (skb_queue_empty(skb_list))
1edfb1af
JB		 813 goto no_frame;
814
83eb935e
MK		 815 if (!ieee80211_rx_reorder_ready(skb_list)) {
816 __skb_queue_purge(skb_list);
817 goto no_frame;
818 }
819
820 /* release frames from the reorder ring buffer */
1edfb1af 821 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 822 while ((skb = __skb_dequeue(skb_list))) {
823 status = IEEE80211_SKB_RXCB(skb);
824 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
825 __skb_queue_tail(frames, skb);
826 }
1edfb1af
JB		 827
828no_frame:
9a886586 829 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 830}
831
d3b2fb53 832static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 833 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 834 u16 head_seq_num,
835 struct sk_buff_head *frames)
1edfb1af
JB		 836{
837 int index;
838
dd318575
JB		 839 lockdep_assert_held(&tid_agg_rx->reorder_lock);
840
9a886586 841 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 842 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 843 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
844 frames);
1edfb1af
JB		 845 }
846}
847
848/*
849 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
850 * the skb was added to the buffer longer than this time ago, the earlier
851 * frames that have not yet been received are assumed to be lost and the skb
852 * can be released for processing. This may also release other skb's from the
853 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 854 *
855 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 856 */
857#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
858
d3b2fb53 859static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 860 struct tid_ampdu_rx *tid_agg_rx,
861 struct sk_buff_head *frames)
aa0c8636 862{
83eb935e 863 int index, i, j;
aa0c8636 864
dd318575
JB		 865 lockdep_assert_held(&tid_agg_rx->reorder_lock);
866
aa0c8636 867 /* release the buffer until next missing frame */
2e3049b7 868 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
83eb935e 869 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
07ae2dfc 870 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 871 /*
872 * No buffers ready to be released, but check whether any
873 * frames in the reorder buffer have timed out.
874 */
aa0c8636
CL		 875 int skipped = 1;
876 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
877 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 878 if (!ieee80211_rx_reorder_ready(
879 &tid_agg_rx->reorder_buf[j])) {
aa0c8636
CL		 880 skipped++;
881 continue;
882 }
499fe9a4
DH		 883 if (skipped &&
884 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 885 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 886 goto set_release_timer;
aa0c8636 887
83eb935e
MK		 888 /* don't leave incomplete A-MSDUs around */
889 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
890 i = (i + 1) % tid_agg_rx->buf_size)
891 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
892
bdcbd8e0
JB		 893 ht_dbg_ratelimited(sdata,
894 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 895 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
896 frames);
aa0c8636
CL		 897
898 /*
899 * Increment the head seq# also for the skipped slots.
900 */
901 tid_agg_rx->head_seq_num =
9a886586
JB		 902 (tid_agg_rx->head_seq_num +
903 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 904 skipped = 0;
905 }
83eb935e
MK		 906 } else while (ieee80211_rx_reorder_ready(
907 &tid_agg_rx->reorder_buf[index])) {
f9e124fb
CL		 908 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
909 frames);
2e3049b7 910 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 911 }
2bff8ebf
CL		 912
913 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 914 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 915
916 for (; j != (index - 1) % tid_agg_rx->buf_size;
917 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 918 if (ieee80211_rx_reorder_ready(
919 &tid_agg_rx->reorder_buf[j]))
2bff8ebf
CL		 920 break;
921 }
922
923 set_release_timer:
924
788211d8
JB		 925 if (!tid_agg_rx->removed)
926 mod_timer(&tid_agg_rx->reorder_timer,
927 tid_agg_rx->reorder_time[j] + 1 +
928 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 929 } else {
930 del_timer(&tid_agg_rx->reorder_timer);
931 }
aa0c8636
CL		 932}
933
1edfb1af
JB		 934/*
935 * As this function belongs to the RX path it must be under
936 * rcu_read_lock protection. It returns false if the frame
937 * can be processed immediately, true if it was consumed.
938 */
d3b2fb53 939static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 940 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 941 struct sk_buff *skb,
942 struct sk_buff_head *frames)
1edfb1af
JB		 943{
944 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 945 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 946 u16 sc = le16_to_cpu(hdr->seq_ctrl);
947 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
948 u16 head_seq_num, buf_size;
949 int index;
2bff8ebf 950 bool ret = true;
1edfb1af 951
dd318575
JB		 952 spin_lock(&tid_agg_rx->reorder_lock);
953
4549cf2b
MK		 954 /*
955 * Offloaded BA sessions have no known starting sequence number so pick
956 * one from first Rxed frame for this tid after BA was started.
957 */
958 if (unlikely(tid_agg_rx->auto_seq)) {
959 tid_agg_rx->auto_seq = false;
960 tid_agg_rx->ssn = mpdu_seq_num;
961 tid_agg_rx->head_seq_num = mpdu_seq_num;
962 }
963
1edfb1af
JB		 964 buf_size = tid_agg_rx->buf_size;
965 head_seq_num = tid_agg_rx->head_seq_num;
966
967 /* frame with out of date sequence number */
9a886586 968 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 969 dev_kfree_skb(skb);
2bff8ebf 970 goto out;
1edfb1af
JB		 971 }
972
973 /*
974 * If frame the sequence number exceeds our buffering window
975 * size release some previous frames to make room for this one.
976 */
9a886586
JB		 977 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
978 head_seq_num = ieee80211_sn_inc(
979 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 980 /* release stored frames up to new head to stack */
d3b2fb53 981 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 982 head_seq_num, frames);
1edfb1af
JB		 983 }
984
985 /* Now the new frame is always in the range of the reordering buffer */
986
2e3049b7 987 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 988
989 /* check if we already stored this frame */
83eb935e 990 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
1edfb1af 991 dev_kfree_skb(skb);
2bff8ebf 992 goto out;
1edfb1af
JB		 993 }
994
995 /*
996 * If the current MPDU is in the right order and nothing else
997 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 998 * If it is first but there's something stored, we may be able
999 * to release frames after this one.
1edfb1af
JB		 1000 */
1001 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1002 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1003 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1004 tid_agg_rx->head_seq_num =
1005 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1006 ret = false;
1007 goto out;
1edfb1af
JB		 1008 }
1009
1010 /* put the frame in the reordering buffer */
83eb935e
MK		 1011 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1012 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1013 tid_agg_rx->reorder_time[index] = jiffies;
1014 tid_agg_rx->stored_mpdu_num++;
1015 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1016 }
1edfb1af 1017
2bff8ebf
CL		 1018 out:
1019 spin_unlock(&tid_agg_rx->reorder_lock);
1020 return ret;
1edfb1af
JB		 1021}
1022
1023/*
1024 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1025 * true if the MPDU was buffered, false if it should be processed.
1026 */
f9e124fb
CL		 1027static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1028 struct sk_buff_head *frames)
1edfb1af 1029{
2569a826
JB		 1030 struct sk_buff *skb = rx->skb;
1031 struct ieee80211_local *local = rx->local;
1edfb1af 1032 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1033 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1034 struct tid_ampdu_rx *tid_agg_rx;
1035 u16 sc;
6cc00d54 1036 u8 tid, ack_policy;
1edfb1af 1037
051a41fa
JB		 1038 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1039 is_multicast_ether_addr(hdr->addr1))
2569a826 1040 goto dont_reorder;
1edfb1af
JB		 1041
1042 /*
1043 * filter the QoS data rx stream according to
1044 * STA/TID and check if this STA/TID is on aggregation
1045 */
1046
1edfb1af 1047 if (!sta)
2569a826 1048 goto dont_reorder;
1edfb1af 1049
6cc00d54
TP		 1050 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1051 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1052 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1053
a87f736d
JB		 1054 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1055 if (!tid_agg_rx)
1056 goto dont_reorder;
1edfb1af
JB		 1057
1058 /* qos null data frames are excluded */
1059 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1060 goto dont_reorder;
1edfb1af 1061
6cc00d54
TP		 1062 /* not part of a BA session */
1063 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1064 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1065 goto dont_reorder;
1066
1edfb1af
JB		 1067 /* new, potentially un-ordered, ampdu frame - process it */
1068
1069 /* reset session timer */
1070 if (tid_agg_rx->timeout)
12d3952f 1071 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1072
1073 /* if this mpdu is fragmented - terminate rx aggregation session */
1074 sc = le16_to_cpu(hdr->seq_ctrl);
1075 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1076 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1077 skb_queue_tail(&rx->sdata->skb_queue, skb);
1078 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1079 return;
1edfb1af
JB		 1080 }
1081
a87f736d
JB		 1082 /*
1083 * No locking needed -- we will only ever process one
1084 * RX packet at a time, and thus own tid_agg_rx. All
1085 * other code manipulating it needs to (and does) make
1086 * sure that we cannot get to it any more before doing
1087 * anything with it.
1088 */
f9e124fb
CL		 1089 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1090 frames))
2569a826
JB		 1091 return;
1092
1093 dont_reorder:
f9e124fb 1094 __skb_queue_tail(frames, skb);
1edfb1af 1095}
33b64eb2 1096
49461622 1097static ieee80211_rx_result debug_noinline
0395442a 1098ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1099{
a7767f95 1100 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1101 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1102
6b0f3274
JB		 1103 /*
1104 * Drop duplicate 802.11 retransmissions
1105 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1106 */
0395442a
JB		 1107
1108 if (rx->skb->len < 24)
1109 return RX_CONTINUE;
1110
1111 if (ieee80211_is_ctl(hdr->frame_control) ||
1112 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1113 is_multicast_ether_addr(hdr->addr1))
1114 return RX_CONTINUE;
1115
a732fa70
JB		 1116 if (!rx->sta)
1117 return RX_CONTINUE;
1118
1119 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1120 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1121 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1122 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1123 return RX_DROP_UNUSABLE;
1124 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1125 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1126 }
1127
0395442a
JB		 1128 return RX_CONTINUE;
1129}
1130
1131static ieee80211_rx_result debug_noinline
1132ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1133{
1134 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1135
571ecf67
JB		 1136 /* Drop disallowed frame classes based on STA auth/assoc state;
1137 * IEEE 802.11, Chap 5.5.
1138 *
ccd7b362
JB		 1139 * mac80211 filters only based on association state, i.e. it drops
1140 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1141 * deauth/disassoc frames when needed. In addition, hostapd is
1142 * responsible for filtering on both auth and assoc states.
1143 */
33b64eb2 1144
902acc78 1145 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1146 return ieee80211_rx_mesh_check(rx);
33b64eb2 1147
a7767f95
HH		 1148 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1149 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1150 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1151 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1152 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1153 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1154 /*
1155 * accept port control frames from the AP even when it's not
1156 * yet marked ASSOC to prevent a race where we don't set the
1157 * assoc bit quickly enough before it sends the first frame
1158 */
1159 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1160 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1161 unsigned int hdrlen;
1162 __be16 ethertype;
1163
1164 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1165
1166 if (rx->skb->len < hdrlen + 8)
1167 return RX_DROP_MONITOR;
1168
1169 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1170 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1171 return RX_CONTINUE;
1172 }
21fc7560
JB		 1173
1174 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1175 cfg80211_rx_spurious_frame(rx->sdata->dev,
1176 hdr->addr2,
1177 GFP_ATOMIC))
1178 return RX_DROP_UNUSABLE;
1179
e4c26add 1180 return RX_DROP_MONITOR;
2a33bee2 1181 }
571ecf67 1182
9ae54c84 1183 return RX_CONTINUE;
570bd537
JB		 1184}
1185
1186
572e0012
KV		 1187static ieee80211_rx_result debug_noinline
1188ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1189{
1190 struct ieee80211_local *local;
1191 struct ieee80211_hdr *hdr;
1192 struct sk_buff *skb;
1193
1194 local = rx->local;
1195 skb = rx->skb;
1196 hdr = (struct ieee80211_hdr *) skb->data;
1197
1198 if (!local->pspolling)
1199 return RX_CONTINUE;
1200
1201 if (!ieee80211_has_fromds(hdr->frame_control))
1202 /* this is not from AP */
1203 return RX_CONTINUE;
1204
1205 if (!ieee80211_is_data(hdr->frame_control))
1206 return RX_CONTINUE;
1207
1208 if (!ieee80211_has_moredata(hdr->frame_control)) {
1209 /* AP has no more frames buffered for us */
1210 local->pspolling = false;
1211 return RX_CONTINUE;
1212 }
1213
1214 /* more data bit is set, let's request a new frame from the AP */
1215 ieee80211_send_pspoll(local, rx->sdata);
1216
1217 return RX_CONTINUE;
1218}
1219
d012a605 1220static void sta_ps_start(struct sta_info *sta)
571ecf67 1221{
133b8226 1222 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1223 struct ieee80211_local *local = sdata->local;
d012a605 1224 struct ps_data *ps;
ba8c3d6f 1225 int tid;
0795af57 1226
d012a605
MP		 1227 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1228 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1229 ps = &sdata->bss->ps;
1230 else
1231 return;
1232
1233 atomic_inc(&ps->num_sta_ps);
c2c98fde 1234 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1235 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1236 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1237 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1238 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1239
17c18bf8
JB		 1240 ieee80211_clear_fast_xmit(sta);
1241
ba8c3d6f
FF		 1242 if (!sta->sta.txq[0])
1243 return;
1244
1245 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1246 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1247
1248 if (!skb_queue_len(&txqi->queue))
1249 set_bit(tid, &sta->txq_buffered_tids);
1250 else
1251 clear_bit(tid, &sta->txq_buffered_tids);
1252 }
571ecf67
JB		 1253}
1254
d012a605 1255static void sta_ps_end(struct sta_info *sta)
571ecf67 1256{
bdcbd8e0
JB		 1257 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1258 sta->sta.addr, sta->sta.aid);
004c872e 1259
c2c98fde 1260 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1261 /*
1262 * Clear the flag only if the other one is still set
1263 * so that the TX path won't start TX'ing new frames
1264 * directly ... In the case that the driver flag isn't
1265 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1266 */
1267 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1268 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1269 sta->sta.addr, sta->sta.aid);
af818581
JB		 1270 return;
1271 }
1272
5ac2e350
JB		 1273 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1274 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1275 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1276}
1277
cf47161a 1278int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1279{
cf47161a 1280 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1281 bool in_ps;
1282
cf47161a 1283 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1284
1285 /* Don't let the same PS state be set twice */
cf47161a 1286 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1287 if ((start && in_ps) || (!start && !in_ps))
1288 return -EINVAL;
1289
1290 if (start)
cf47161a 1291 sta_ps_start(sta);
d057e5a3 1292 else
cf47161a 1293 sta_ps_end(sta);
d057e5a3
AN		 1294
1295 return 0;
1296}
1297EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1298
47086fc5
JB		 1299static ieee80211_rx_result debug_noinline
1300ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1301{
1302 struct ieee80211_sub_if_data *sdata = rx->sdata;
1303 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1304 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1305 int tid, ac;
1306
5c90067c 1307 if (!rx->sta)
47086fc5
JB		 1308 return RX_CONTINUE;
1309
1310 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1311 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1312 return RX_CONTINUE;
1313
1314 /*
1315 * The device handles station powersave, so don't do anything about
1316 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1317 * it to mac80211 since they're handled.)
1318 */
30686bf7 1319 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1320 return RX_CONTINUE;
1321
1322 /*
1323 * Don't do anything if the station isn't already asleep. In
1324 * the uAPSD case, the station will probably be marked asleep,
1325 * in the PS-Poll case the station must be confused ...
1326 */
c2c98fde 1327 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1328 return RX_CONTINUE;
1329
1330 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1331 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1332 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1333 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1334 else
c2c98fde 1335 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1336 }
47086fc5
JB		 1337
1338 /* Free PS Poll skb here instead of returning RX_DROP that would
1339 * count as an dropped frame. */
1340 dev_kfree_skb(rx->skb);
1341
1342 return RX_QUEUED;
1343 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1344 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1345 ieee80211_has_pm(hdr->frame_control) &&
1346 (ieee80211_is_data_qos(hdr->frame_control) ||
1347 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1348 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1349 ac = ieee802_1d_to_ac[tid & 7];
1350
1351 /*
1352 * If this AC is not trigger-enabled do nothing.
1353 *
1354 * NB: This could/should check a separate bitmap of trigger-
1355 * enabled queues, but for now we only implement uAPSD w/o
1356 * TSPEC changes to the ACs, so they're always the same.
1357 */
1358 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1359 return RX_CONTINUE;
1360
1361 /* if we are in a service period, do nothing */
c2c98fde 1362 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1363 return RX_CONTINUE;
1364
c2c98fde 1365 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1366 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1367 else
c2c98fde 1368 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1369 }
1370
1371 return RX_CONTINUE;
1372}
1373
49461622 1374static ieee80211_rx_result debug_noinline
5cf121c3 1375ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1376{
1377 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1378 struct sk_buff *skb = rx->skb;
1379 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1381 int i;
571ecf67
JB		 1382
1383 if (!sta)
9ae54c84 1384 return RX_CONTINUE;
571ecf67 1385
b291ba11
JB		 1386 /*
1387 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
b291ba11 1393 */
05c914fe 1394 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1395 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1396 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1397 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1399 sta->rx_stats.last_rx = jiffies;
f4ebddf9
HR		 1400 if (ieee80211_is_data(hdr->frame_control) &&
1401 !is_multicast_ether_addr(hdr->addr1)) {
e5a9f8d0
JB		 1402 sta->rx_stats.last_rate_idx =
1403 status->rate_idx;
1404 sta->rx_stats.last_rate_flag =
1405 status->flag;
1406 sta->rx_stats.last_rate_vht_flag =
1407 status->vht_flag;
1408 sta->rx_stats.last_rate_vht_nss =
1409 status->vht_nss;
3af6334c
FF		 1410 }
1411 }
239281f8 1412 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1413 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1414 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1415 /*
33b64eb2
LCC		 1416 * Mesh beacons will update last_rx when if they are found to
1417 * match the current local configuration when processed.
571ecf67 1418 */
e5a9f8d0 1419 sta->rx_stats.last_rx = jiffies;
3af6334c 1420 if (ieee80211_is_data(hdr->frame_control)) {
e5a9f8d0
JB		 1421 sta->rx_stats.last_rate_idx = status->rate_idx;
1422 sta->rx_stats.last_rate_flag = status->flag;
1423 sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1424 sta->rx_stats.last_rate_vht_nss = status->vht_nss;
3af6334c 1425 }
571ecf67
JB		 1426 }
1427
3cf335d5
KV		 1428 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1429 ieee80211_sta_rx_notify(rx->sdata, hdr);
1430
e5a9f8d0
JB		 1431 sta->rx_stats.fragments++;
1432 sta->rx_stats.bytes += rx->skb->len;
fe8431f8 1433 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0
JB		 1434 sta->rx_stats.last_signal = status->signal;
1435 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
fe8431f8 1436 }
571ecf67 1437
ef0621e8 1438 if (status->chains) {
e5a9f8d0 1439 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1440 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1441 int signal = status->chain_signal[i];
1442
1443 if (!(status->chains & BIT(i)))
1444 continue;
1445
e5a9f8d0
JB		 1446 sta->rx_stats.chain_signal_last[i] = signal;
1447 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1448 -signal);
ef0621e8
FF		 1449 }
1450 }
1451
72eaa43a
JB		 1452 /*
1453 * Change STA power saving mode only at the end of a frame
1454 * exchange sequence.
1455 */
30686bf7 1456 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1457 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1458 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1459 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1460 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1461 /* PM bit is only checked in frames where it isn't reserved,
1462 * in AP mode it's reserved in non-bufferable management frames
1463 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1464 */
1465 (!ieee80211_is_mgmt(hdr->frame_control) ||
1466 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1467 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1468 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1469 sta_ps_end(sta);
72eaa43a
JB		 1470 } else {
1471 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1472 sta_ps_start(sta);
72eaa43a 1473 }
571ecf67
JB		 1474 }
1475
3f52b7e3
MP		 1476 /* mesh power save support */
1477 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1478 ieee80211_mps_rx_h_sta_process(sta, hdr);
1479
22403def
JB		 1480 /*
1481 * Drop (qos-)data::nullfunc frames silently, since they
1482 * are used only to control station power saving mode.
1483 */
1484 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1485 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1486 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1487
1488 /*
1489 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1490 * that was not moved to a 4-addr STA vlan yet send
1491 * the event to userspace and for older hostapd drop
1492 * the frame to the monitor interface.
d524215f
FF		 1493 */
1494 if (ieee80211_has_a4(hdr->frame_control) &&
1495 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1496 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1497 !rx->sdata->u.vlan.sta))) {
1498 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1499 cfg80211_rx_unexpected_4addr_frame(
1500 rx->sdata->dev, sta->sta.addr,
1501 GFP_ATOMIC);
d524215f 1502 return RX_DROP_MONITOR;
e7f4a940 1503 }
22403def
JB		 1504 /*
1505 * Update counter and free packet here to avoid
1506 * counting this as a dropped packed.
1507 */
e5a9f8d0 1508 sta->rx_stats.packets++;
571ecf67 1509 dev_kfree_skb(rx->skb);
9ae54c84 1510 return RX_QUEUED;
571ecf67
JB		 1511 }
1512
9ae54c84 1513 return RX_CONTINUE;
571ecf67
JB		 1514} /* ieee80211_rx_h_sta_process */
1515
86c228a7
JA		 1516static ieee80211_rx_result debug_noinline
1517ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1518{
1519 struct sk_buff *skb = rx->skb;
1520 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1521 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1522 int keyidx;
1523 int hdrlen;
1524 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1525 struct ieee80211_key *sta_ptk = NULL;
1526 int mmie_keyidx = -1;
1527 __le16 fc;
2475b1cc 1528 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1529
1530 /*
1531 * Key selection 101
1532 *
1533 * There are four types of keys:
1534 * - GTK (group keys)
1535 * - IGTK (group keys for management frames)
1536 * - PTK (pairwise keys)
1537 * - STK (station-to-station pairwise keys)
1538 *
1539 * When selecting a key, we have to distinguish between multicast
1540 * (including broadcast) and unicast frames, the latter can only
1541 * use PTKs and STKs while the former always use GTKs and IGTKs.
1542 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1543 * unicast frames can also use key indices like GTKs. Hence, if we
1544 * don't have a PTK/STK we check the key index for a WEP key.
1545 *
1546 * Note that in a regular BSS, multicast frames are sent by the
1547 * AP only, associated stations unicast the frame to the AP first
1548 * which then multicasts it on their behalf.
1549 *
1550 * There is also a slight problem in IBSS mode: GTKs are negotiated
1551 * with each station, that is something we don't currently handle.
1552 * The spec seems to expect that one negotiates the same key with
1553 * every station but there's no such requirement; VLANs could be
1554 * possible.
1555 */
1556
86c228a7
JA		 1557 /* start without a key */
1558 rx->key = NULL;
2475b1cc 1559 fc = hdr->frame_control;
86c228a7 1560
2475b1cc
MS		 1561 if (rx->sta) {
1562 int keyid = rx->sta->ptk_idx;
86c228a7 1563
2475b1cc
MS		 1564 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1565 cs = rx->sta->cipher_scheme;
1566 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1567 if (unlikely(keyid < 0))
1568 return RX_DROP_UNUSABLE;
1569 }
1570 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1571 }
86c228a7
JA		 1572
1573 if (!ieee80211_has_protected(fc))
1574 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1575
1576 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1577 rx->key = sta_ptk;
1578 if ((status->flag & RX_FLAG_DECRYPTED) &&
1579 (status->flag & RX_FLAG_IV_STRIPPED))
1580 return RX_CONTINUE;
1581 /* Skip decryption if the frame is not protected. */
1582 if (!ieee80211_has_protected(fc))
1583 return RX_CONTINUE;
1584 } else if (mmie_keyidx >= 0) {
1585 /* Broadcast/multicast robust management frame / BIP */
1586 if ((status->flag & RX_FLAG_DECRYPTED) &&
1587 (status->flag & RX_FLAG_IV_STRIPPED))
1588 return RX_CONTINUE;
1589
1590 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1591 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1592 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1593 if (rx->sta)
1594 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1595 if (!rx->key)
1596 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1597 } else if (!ieee80211_has_protected(fc)) {
1598 /*
1599 * The frame was not protected, so skip decryption. However, we
1600 * need to set rx->key if there is a key that could have been
1601 * used so that the frame may be dropped if encryption would
1602 * have been expected.
1603 */
1604 struct ieee80211_key *key = NULL;
1605 struct ieee80211_sub_if_data *sdata = rx->sdata;
1606 int i;
1607
1608 if (ieee80211_is_mgmt(fc) &&
1609 is_multicast_ether_addr(hdr->addr1) &&
1610 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1611 rx->key = key;
1612 else {
1613 if (rx->sta) {
1614 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1615 key = rcu_dereference(rx->sta->gtk[i]);
1616 if (key)
1617 break;
1618 }
1619 }
1620 if (!key) {
1621 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1622 key = rcu_dereference(sdata->keys[i]);
1623 if (key)
1624 break;
1625 }
1626 }
1627 if (key)
1628 rx->key = key;
1629 }
1630 return RX_CONTINUE;
1631 } else {
1632 u8 keyid;
2475b1cc 1633
86c228a7
JA		 1634 /*
1635 * The device doesn't give us the IV so we won't be
1636 * able to look up the key. That's ok though, we
1637 * don't need to decrypt the frame, we just won't
1638 * be able to keep statistics accurate.
1639 * Except for key threshold notifications, should
1640 * we somehow allow the driver to tell us which key
1641 * the hardware used if this flag is set?
1642 */
1643 if ((status->flag & RX_FLAG_DECRYPTED) &&
1644 (status->flag & RX_FLAG_IV_STRIPPED))
1645 return RX_CONTINUE;
1646
1647 hdrlen = ieee80211_hdrlen(fc);
1648
2475b1cc
MS		 1649 if (cs) {
1650 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1651
2475b1cc
MS		 1652 if (unlikely(keyidx < 0))
1653 return RX_DROP_UNUSABLE;
1654 } else {
1655 if (rx->skb->len < 8 + hdrlen)
1656 return RX_DROP_UNUSABLE; /* TODO: count this? */
1657 /*
1658 * no need to call ieee80211_wep_get_keyidx,
1659 * it verifies a bunch of things we've done already
1660 */
1661 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1662 keyidx = keyid >> 6;
1663 }
86c228a7
JA		 1664
1665 /* check per-station GTK first, if multicast packet */
1666 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1667 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1668
1669 /* if not found, try default key */
1670 if (!rx->key) {
1671 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1672
1673 /*
1674 * RSNA-protected unicast frames should always be
1675 * sent with pairwise or station-to-station keys,
1676 * but for WEP we allow using a key index as well.
1677 */
1678 if (rx->key &&
1679 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1680 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1681 !is_multicast_ether_addr(hdr->addr1))
1682 rx->key = NULL;
1683 }
1684 }
1685
1686 if (rx->key) {
1687 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1688 return RX_DROP_MONITOR;
1689
86c228a7
JA		 1690 /* TODO: add threshold stuff again */
1691 } else {
1692 return RX_DROP_MONITOR;
1693 }
1694
1695 switch (rx->key->conf.cipher) {
1696 case WLAN_CIPHER_SUITE_WEP40:
1697 case WLAN_CIPHER_SUITE_WEP104:
1698 result = ieee80211_crypto_wep_decrypt(rx);
1699 break;
1700 case WLAN_CIPHER_SUITE_TKIP:
1701 result = ieee80211_crypto_tkip_decrypt(rx);
1702 break;
1703 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1704 result = ieee80211_crypto_ccmp_decrypt(
1705 rx, IEEE80211_CCMP_MIC_LEN);
1706 break;
1707 case WLAN_CIPHER_SUITE_CCMP_256:
1708 result = ieee80211_crypto_ccmp_decrypt(
1709 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1710 break;
1711 case WLAN_CIPHER_SUITE_AES_CMAC:
1712 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1713 break;
56c52da2
JM		 1714 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1715 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1716 break;
8ade538b
JM		 1717 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1718 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1719 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1720 break;
00b9cfa3
JM		 1721 case WLAN_CIPHER_SUITE_GCMP:
1722 case WLAN_CIPHER_SUITE_GCMP_256:
1723 result = ieee80211_crypto_gcmp_decrypt(rx);
1724 break;
86c228a7 1725 default:
2475b1cc 1726 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1727 }
1728
1729 /* the hdr variable is invalid after the decrypt handlers */
1730
1731 /* either the frame has been decrypted or will be dropped */
1732 status->flag |= RX_FLAG_DECRYPTED;
1733
1734 return result;
1735}
1736
571ecf67
JB		 1737static inline struct ieee80211_fragment_entry *
1738ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1739 unsigned int frag, unsigned int seq, int rx_queue,
1740 struct sk_buff **skb)
1741{
1742 struct ieee80211_fragment_entry *entry;
571ecf67 1743
571ecf67
JB		 1744 entry = &sdata->fragments[sdata->fragment_next++];
1745 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1746 sdata->fragment_next = 0;
1747
bdcbd8e0 1748 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1749 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1750
1751 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1752 *skb = NULL;
1753 entry->first_frag_time = jiffies;
1754 entry->seq = seq;
1755 entry->rx_queue = rx_queue;
1756 entry->last_frag = frag;
1757 entry->ccmp = 0;
1758 entry->extra_len = 0;
1759
1760 return entry;
1761}
1762
1763static inline struct ieee80211_fragment_entry *
1764ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1765 unsigned int frag, unsigned int seq,
571ecf67
JB		 1766 int rx_queue, struct ieee80211_hdr *hdr)
1767{
1768 struct ieee80211_fragment_entry *entry;
1769 int i, idx;
1770
1771 idx = sdata->fragment_next;
1772 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1773 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1774
1775 idx--;
1776 if (idx < 0)
1777 idx = IEEE80211_FRAGMENT_MAX - 1;
1778
1779 entry = &sdata->fragments[idx];
1780 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1781 entry->rx_queue != rx_queue ||
1782 entry->last_frag + 1 != frag)
1783 continue;
1784
b73d70ad 1785 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1786
b73d70ad
HH		 1787 /*
1788 * Check ftype and addresses are equal, else check next fragment
1789 */
1790 if (((hdr->frame_control ^ f_hdr->frame_control) &
1791 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1792 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1793 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1794 continue;
1795
ab46623e 1796 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1797 __skb_queue_purge(&entry->skb_list);
1798 continue;
1799 }
1800 return entry;
1801 }
1802
1803 return NULL;
1804}
1805
49461622 1806static ieee80211_rx_result debug_noinline
5cf121c3 1807ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1808{
1809 struct ieee80211_hdr *hdr;
1810 u16 sc;
358c8d9d 1811 __le16 fc;
571ecf67
JB		 1812 unsigned int frag, seq;
1813 struct ieee80211_fragment_entry *entry;
1814 struct sk_buff *skb;
554891e6 1815 struct ieee80211_rx_status *status;
571ecf67 1816
b73d70ad 1817 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1818 fc = hdr->frame_control;
f7fbf70e
JC		 1819
1820 if (ieee80211_is_ctl(fc))
1821 return RX_CONTINUE;
1822
571ecf67
JB		 1823 sc = le16_to_cpu(hdr->seq_ctrl);
1824 frag = sc & IEEE80211_SCTL_FRAG;
1825
b8fff407 1826 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 1827 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 1828 goto out_no_led;
571ecf67 1829 }
b8fff407 1830
d025933e
AM		 1831 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1832 goto out;
1833
571ecf67
JB		 1834 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1835
e3cf8b3f
ZY		 1836 if (skb_linearize(rx->skb))
1837 return RX_DROP_UNUSABLE;
1838
058897a4
AK		 1839 /*
1840 * skb_linearize() might change the skb->data and
1841 * previously cached variables (in this case, hdr) need to
1842 * be refreshed with the new data.
1843 */
1844 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1845 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1846
1847 if (frag == 0) {
1848 /* This is the first fragment of a new frame. */
1849 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1850 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 1851 if (rx->key &&
1852 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1853 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
358c8d9d 1854 ieee80211_has_protected(fc)) {
9e26297a 1855 int queue = rx->security_idx;
571ecf67
JB		 1856 /* Store CCMP PN so that we can verify that the next
1857 * fragment has a sequential PN value. */
1858 entry->ccmp = 1;
1859 memcpy(entry->last_pn,
9190252c 1860 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1861 IEEE80211_CCMP_PN_LEN);
571ecf67 1862 }
9ae54c84 1863 return RX_QUEUED;
571ecf67
JB		 1864 }
1865
1866 /* This is a fragment for a frame that should already be pending in
1867 * fragment cache. Add this fragment to the end of the pending entry.
1868 */
9e26297a
JB		 1869 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1870 rx->seqno_idx, hdr);
571ecf67
JB		 1871 if (!entry) {
1872 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1873 return RX_DROP_MONITOR;
571ecf67
JB		 1874 }
1875
1876 /* Verify that MPDUs within one MSDU have sequential PN values.
1877 * (IEEE 802.11i, 8.3.3.4.5) */
1878 if (entry->ccmp) {
1879 int i;
4325f6ca 1880 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1881 int queue;
2b2ba0db
JM		 1882 if (!rx->key ||
1883 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1884 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
e4c26add 1885 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1886 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1887 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1888 pn[i]++;
1889 if (pn[i])
1890 break;
1891 }
9e26297a 1892 queue = rx->security_idx;
9190252c 1893 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1894 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1895 return RX_DROP_UNUSABLE;
4325f6ca 1896 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1897 }
1898
358c8d9d 1899 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1900 __skb_queue_tail(&entry->skb_list, rx->skb);
1901 entry->last_frag = frag;
1902 entry->extra_len += rx->skb->len;
358c8d9d 1903 if (ieee80211_has_morefrags(fc)) {
571ecf67 1904 rx->skb = NULL;
9ae54c84 1905 return RX_QUEUED;
571ecf67
JB		 1906 }
1907
1908 rx->skb = __skb_dequeue(&entry->skb_list);
1909 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 1910 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 1911 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1912 GFP_ATOMIC))) {
1913 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1914 __skb_queue_purge(&entry->skb_list);
e4c26add 1915 return RX_DROP_UNUSABLE;
571ecf67
JB		 1916 }
1917 }
1918 while ((skb = __skb_dequeue(&entry->skb_list))) {
1919 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1920 dev_kfree_skb(skb);
1921 }
1922
1923 /* Complete frame has been reassembled - process it now */
554891e6 1924 status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 1925
1926 out:
d025933e
AM		 1927 ieee80211_led_rx(rx->local);
1928 out_no_led:
571ecf67 1929 if (rx->sta)
e5a9f8d0 1930 rx->sta->rx_stats.packets++;
9ae54c84 1931 return RX_CONTINUE;
571ecf67
JB		 1932}
1933
1df332e8 1934static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1935{
1df332e8 1936 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1937 return -EACCES;
571ecf67 1938
76ee65bf 1939 return 0;
571ecf67
JB		 1940}
1941
1df332e8 1942static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1943{
eb9fb5b8
JB		 1944 struct sk_buff *skb = rx->skb;
1945 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1946
3017b80b 1947 /*
7848ba7d
JB		 1948 * Pass through unencrypted frames if the hardware has
1949 * decrypted them already.
3017b80b 1950 */
eb9fb5b8 1951 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1952 return 0;
571ecf67
JB		 1953
1954 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1955 if (unlikely(!ieee80211_has_protected(fc) &&
1956 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 1957 ieee80211_is_data(fc) && rx->key))
76ee65bf 1958 return -EACCES;
bef5d1c7
JB		 1959
1960 return 0;
1961}
1962
1df332e8 1963static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1964{
1965 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1966 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1967 __le16 fc = hdr->frame_control;
bef5d1c7 1968
e3efca0a
JM		 1969 /*
1970 * Pass through unencrypted frames if the hardware has
1971 * decrypted them already.
1972 */
1973 if (status->flag & RX_FLAG_DECRYPTED)
1974 return 0;
bef5d1c7 1975
c2c98fde 1976 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1977 if (unlikely(!ieee80211_has_protected(fc) &&
1978 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1979 rx->key)) {
6ff57cf8
JB		 1980 if (ieee80211_is_deauth(fc) ||
1981 ieee80211_is_disassoc(fc))
1982 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1983 rx->skb->data,
1984 rx->skb->len);
f2ca3ea4 1985 return -EACCES;
cf4e594e 1986 }
f2ca3ea4 1987 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1988 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1989 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1990 if (ieee80211_is_deauth(fc) ||
1991 ieee80211_is_disassoc(fc))
1992 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1993 rx->skb->data,
1994 rx->skb->len);
f2ca3ea4 1995 return -EACCES;
cf4e594e 1996 }
f2ca3ea4
JM		 1997 /*
1998 * When using MFP, Action frames are not allowed prior to
1999 * having configured keys.
2000 */
2001 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2002 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2003 return -EACCES;
2004 }
b3fc9c6c 2005
76ee65bf 2006 return 0;
571ecf67
JB		 2007}
2008
76ee65bf 2009static int
4114fa21 2010__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2011{
eb9fb5b8 2012 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2013 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2014 bool check_port_control = false;
2015 struct ethhdr *ehdr;
2016 int ret;
f14543ee 2017
4114fa21 2018 *port_control = false;
9bc383de
JB		 2019 if (ieee80211_has_a4(hdr->frame_control) &&
2020 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2021 return -1;
9bc383de 2022
fbb327c5
FF		 2023 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2024 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2025
2026 if (!sdata->u.mgd.use_4addr)
2027 return -1;
2028 else
2029 check_port_control = true;
2030 }
2031
9bc383de 2032 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2033 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2034 return -1;
571ecf67 2035
fbb327c5 2036 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2037 if (ret < 0)
fbb327c5
FF		 2038 return ret;
2039
2040 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2041 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2042 *port_control = true;
2043 else if (check_port_control)
fbb327c5
FF		 2044 return -1;
2045
2046 return 0;
76ee65bf 2047}
571ecf67 2048
ce3edf6d
JB		 2049/*
2050 * requires that rx->skb is a frame with ethernet header
2051 */
358c8d9d 2052static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2053{
c97c23e3 2054 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2055 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2056 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2057
2058 /*
2059 * Allow EAPOL frames to us/the PAE group address regardless
2060 * of whether the frame was encrypted or not.
2061 */
a621fa4d 2062 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2063 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2064 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2065 return true;
2066
2067 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2068 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2069 return false;
2070
2071 return true;
2072}
2073
2074/*
2075 * requires that rx->skb is a frame with ethernet header
2076 */
76ee65bf 2077static void
5cf121c3 2078ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2079{
eb9fb5b8
JB		 2080 struct ieee80211_sub_if_data *sdata = rx->sdata;
2081 struct net_device *dev = sdata->dev;
76ee65bf 2082 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2083 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2084 struct sta_info *dsta;
571ecf67 2085
76ee65bf
RR		 2086 skb = rx->skb;
2087 xmit_skb = NULL;
571ecf67 2088
5a490510
JB		 2089 ieee80211_rx_stats(dev, skb->len);
2090
05c914fe
JB		 2091 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2092 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2093 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2094 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2095 if (is_multicast_ether_addr(ehdr->h_dest)) {
2096 /*
2097 * send multicast frames both to higher layers in
2098 * local net stack and back to the wireless medium
2099 */
76ee65bf 2100 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2101 if (!xmit_skb)
bdcbd8e0 2102 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2103 dev->name);
571ecf67 2104 } else {
abe60632
JB		 2105 dsta = sta_info_get(sdata, skb->data);
2106 if (dsta) {
ce3edf6d
JB		 2107 /*
2108 * The destination station is associated to
2109 * this AP (in this VLAN), so send the frame
2110 * directly to it and do not pass it to local
2111 * net stack.
571ecf67 2112 */
76ee65bf 2113 xmit_skb = skb;
571ecf67
JB		 2114 skb = NULL;
2115 }
571ecf67
JB		 2116 }
2117 }
2118
59d9cb07 2119#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2120 if (skb) {
2121 /* 'align' will only take the values 0 or 2 here since all
2122 * frames are required to be aligned to 2-byte boundaries
2123 * when being passed to mac80211; the code here works just
2124 * as well if that isn't true, but mac80211 assumes it can
2125 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2126 */
9e890a1f
JB		 2127 int align;
2128
2129 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2130 if (align) {
2131 if (WARN_ON(skb_headroom(skb) < 3)) {
2132 dev_kfree_skb(skb);
2133 skb = NULL;
2134 } else {
2135 u8 *data = skb->data;
8ce0b589
ZY		 2136 size_t len = skb_headlen(skb);
2137 skb->data -= align;
2138 memmove(skb->data, data, len);
2139 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2140 }
2141 }
9e890a1f 2142 }
d1c3a37c
JB		 2143#endif
2144
9e890a1f
JB		 2145 if (skb) {
2146 /* deliver to local stack */
2147 skb->protocol = eth_type_trans(skb, dev);
2148 memset(skb->cb, 0, sizeof(skb->cb));
af9f9b22
JB		 2149 if (rx->napi)
2150 napi_gro_receive(rx->napi, skb);
06d181a8
JB		 2151 else
2152 netif_receive_skb(skb);
571ecf67
JB		 2153 }
2154
76ee65bf 2155 if (xmit_skb) {
aef6c928
HS		 2156 /*
2157 * Send to wireless media and increase priority by 256 to
2158 * keep the received priority instead of reclassifying
2159 * the frame (see cfg80211_classify8021d).
2160 */
2161 xmit_skb->priority += 256;
f831e909 2162 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2163 skb_reset_network_header(xmit_skb);
2164 skb_reset_mac_header(xmit_skb);
76ee65bf 2165 dev_queue_xmit(xmit_skb);
571ecf67 2166 }
76ee65bf
RR		 2167}
2168
49461622 2169static ieee80211_rx_result debug_noinline
5cf121c3 2170ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2171{
eb9fb5b8 2172 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2173 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2174 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2175 __le16 fc = hdr->frame_control;
eaf85ca7 2176 struct sk_buff_head frame_list;
554891e6 2177 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2178
358c8d9d 2179 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2180 return RX_CONTINUE;
fd4c7f2f 2181
358c8d9d 2182 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2183 return RX_DROP_MONITOR;
fd4c7f2f 2184
554891e6 2185 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2186 return RX_CONTINUE;
fd4c7f2f 2187
eaf85ca7
ZY		 2188 if (ieee80211_has_a4(hdr->frame_control) &&
2189 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2190 !rx->sdata->u.vlan.sta)
e4c26add 2191 return RX_DROP_UNUSABLE;
fd4c7f2f 2192
eaf85ca7
ZY		 2193 if (is_multicast_ether_addr(hdr->addr1) &&
2194 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2195 rx->sdata->u.vlan.sta) ||
2196 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2197 rx->sdata->u.mgd.use_4addr)))
e4c26add 2198 return RX_DROP_UNUSABLE;
fd4c7f2f 2199
eaf85ca7
ZY		 2200 skb->dev = dev;
2201 __skb_queue_head_init(&frame_list);
fd4c7f2f 2202
e3cf8b3f
ZY		 2203 if (skb_linearize(skb))
2204 return RX_DROP_UNUSABLE;
2205
eaf85ca7
ZY		 2206 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2207 rx->sdata->vif.type,
8b3becad 2208 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2209
eaf85ca7
ZY		 2210 while (!skb_queue_empty(&frame_list)) {
2211 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2212
358c8d9d 2213 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2214 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2215 continue;
2216 }
fd4c7f2f
RR		 2217
2218 ieee80211_deliver_skb(rx);
2219 }
2220
9ae54c84 2221 return RX_QUEUED;
fd4c7f2f
RR		 2222}
2223
bf94e17b 2224#ifdef CONFIG_MAC80211_MESH
b0dee578 2225static ieee80211_rx_result
e32f85f7
LCC		 2226ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2227{
30789eb6
TP		 2228 struct ieee80211_hdr *fwd_hdr, *hdr;
2229 struct ieee80211_tx_info *info;
e32f85f7 2230 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2231 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2232 struct ieee80211_local *local = rx->local;
eb9fb5b8 2233 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2234 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2235 u16 q, hdrlen;
e32f85f7
LCC		 2236
2237 hdr = (struct ieee80211_hdr *) skb->data;
2238 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2239
2240 /* make sure fixed part of mesh header is there, also checks skb len */
2241 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2242 return RX_DROP_MONITOR;
2243
2244 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2245
2246 /* make sure full mesh header is there, also checks skb len */
2247 if (!pskb_may_pull(rx->skb,
2248 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2249 return RX_DROP_MONITOR;
2250
2251 /* reload pointers */
2252 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2253 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2254
d0c22119
BC		 2255 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2256 return RX_DROP_MONITOR;
2257
2157fdd6
TP		 2258 /* frame is in RMC, don't forward */
2259 if (ieee80211_is_data(hdr->frame_control) &&
2260 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2261 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2262 return RX_DROP_MONITOR;
2263
5c90067c 2264 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2265 return RX_CONTINUE;
2266
2267 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2268 return RX_DROP_MONITOR;
2269
43b7b314 2270 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2271 struct mesh_path *mppath;
43b7b314
JC		 2272 char *proxied_addr;
2273 char *mpp_addr;
2274
2275 if (is_multicast_ether_addr(hdr->addr1)) {
2276 mpp_addr = hdr->addr3;
2277 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2278 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2279 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2280 mpp_addr = hdr->addr4;
2281 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2282 } else {
2283 return RX_DROP_MONITOR;
43b7b314 2284 }
79617dee 2285
79617dee 2286 rcu_read_lock();
bf7cd94d 2287 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2288 if (!mppath) {
bf7cd94d 2289 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2290 } else {
2291 spin_lock_bh(&mppath->state_lock);
b203ca39 2292 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2293 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2294 spin_unlock_bh(&mppath->state_lock);
2295 }
2296 rcu_read_unlock();
2297 }
2298
3c5772a5
JC		 2299 /* Frame has reached destination. Don't forward */
2300 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2301 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2302 return RX_CONTINUE;
2303
00e96dec 2304 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2305 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2306 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2307 return RX_DROP_MONITOR;
2308 }
2309 skb_set_queue_mapping(skb, q);
e32f85f7 2310
30789eb6
TP		 2311 if (!--mesh_hdr->ttl) {
2312 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2313 goto out;
30789eb6
TP		 2314 }
2315
d665508b
CYY		 2316 if (!ifmsh->mshcfg.dot11MeshForwarding)
2317 goto out;
2318
30789eb6
TP		 2319 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2320 if (!fwd_skb) {
bdcbd8e0 2321 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2322 sdata->name);
30789eb6
TP		 2323 goto out;
2324 }
2325
2326 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2327 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2328 info = IEEE80211_SKB_CB(fwd_skb);
2329 memset(info, 0, sizeof(*info));
2330 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2331 info->control.vif = &rx->sdata->vif;
2332 info->control.jiffies = jiffies;
2333 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2334 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2335 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2336 /* update power mode indication when forwarding */
2337 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2338 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2339 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2340 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2341 } else {
2342 /* unable to resolve next hop */
bf7cd94d 2343 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2344 fwd_hdr->addr3, 0,
2345 WLAN_REASON_MESH_PATH_NOFORWARD,
2346 fwd_hdr->addr2);
30789eb6 2347 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2348 kfree_skb(fwd_skb);
30789eb6 2349 return RX_DROP_MONITOR;
e32f85f7
LCC		 2350 }
2351
30789eb6
TP		 2352 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2353 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2354 out:
df140465 2355 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2356 return RX_CONTINUE;
df140465 2357 return RX_DROP_MONITOR;
e32f85f7 2358}
bf94e17b 2359#endif
e32f85f7 2360
49461622 2361static ieee80211_rx_result debug_noinline
5cf121c3 2362ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2363{
eb9fb5b8 2364 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2365 struct ieee80211_local *local = rx->local;
eb9fb5b8 2366 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2368 __le16 fc = hdr->frame_control;
4114fa21 2369 bool port_control;
ce3edf6d 2370 int err;
76ee65bf 2371
358c8d9d 2372 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2373 return RX_CONTINUE;
76ee65bf 2374
358c8d9d 2375 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2376 return RX_DROP_MONITOR;
76ee65bf 2377
79c892b8 2378 if (rx->sta) {
3d6dc343 2379 /* The seqno index has the same property as needed
79c892b8
JB		 2380 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2381 * for non-QoS-data frames. Here we know it's a data
2382 * frame, so count MSDUs.
2383 */
e5a9f8d0 2384 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
79c892b8
JB		 2385 }
2386
f14543ee 2387 /*
e7f4a940
JB		 2388 * Send unexpected-4addr-frame event to hostapd. For older versions,
2389 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2390 */
2391 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2392 sdata->vif.type == NL80211_IFTYPE_AP) {
2393 if (rx->sta &&
2394 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2395 cfg80211_rx_unexpected_4addr_frame(
2396 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2397 return RX_DROP_MONITOR;
e7f4a940 2398 }
f14543ee 2399
4114fa21 2400 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2401 if (unlikely(err))
e4c26add 2402 return RX_DROP_UNUSABLE;
76ee65bf 2403
358c8d9d 2404 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2405 return RX_DROP_MONITOR;
ce3edf6d 2406
8a4d32f3
AN		 2407 /* directly handle TDLS channel switch requests/responses */
2408 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2409 cpu_to_be16(ETH_P_TDLS))) {
2410 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2411
2412 if (pskb_may_pull(rx->skb,
2413 offsetof(struct ieee80211_tdls_data, u)) &&
2414 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2415 tf->category == WLAN_CATEGORY_TDLS &&
2416 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2417 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2418 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2419 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2420 if (rx->sta)
e5a9f8d0 2421 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2422
2423 return RX_QUEUED;
2424 }
2425 }
2426
4114fa21
FF		 2427 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2428 unlikely(port_control) && sdata->bss) {
2429 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2430 u.ap);
2431 dev = sdata->dev;
2432 rx->sdata = sdata;
2433 }
2434
76ee65bf
RR		 2435 rx->skb->dev = dev;
2436
08ca944e 2437 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2438 !is_multicast_ether_addr(
2439 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2440 (!local->scanning &&
2441 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2442 mod_timer(&local->dynamic_ps_timer, jiffies +
2443 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2444 }
2445
76ee65bf 2446 ieee80211_deliver_skb(rx);
571ecf67 2447
9ae54c84 2448 return RX_QUEUED;
571ecf67
JB		 2449}
2450
49461622 2451static ieee80211_rx_result debug_noinline
f9e124fb 2452ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2453{
71364716 2454 struct sk_buff *skb = rx->skb;
a7767f95 2455 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2456 struct tid_ampdu_rx *tid_agg_rx;
2457 u16 start_seq_num;
2458 u16 tid;
2459
a7767f95 2460 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2461 return RX_CONTINUE;
71364716 2462
a7767f95 2463 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2464 struct {
2465 __le16 control, start_seq_num;
2466 } __packed bar_data;
6382246e
EG		 2467 struct ieee80211_event event = {
2468 .type = BAR_RX_EVENT,
2469 };
8ae5977f 2470
71364716 2471 if (!rx->sta)
a02ae758 2472 return RX_DROP_MONITOR;
8ae5977f
JB		 2473
2474 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2475 &bar_data, sizeof(bar_data)))
2476 return RX_DROP_MONITOR;
2477
8ae5977f 2478 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2479
2480 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2481 if (!tid_agg_rx)
a02ae758 2482 return RX_DROP_MONITOR;
71364716 2483
8ae5977f 2484 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2485 event.u.ba.tid = tid;
2486 event.u.ba.ssn = start_seq_num;
2487 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2488
2489 /* reset session timer */
20ad19d0
JB		 2490 if (tid_agg_rx->timeout)
2491 mod_timer(&tid_agg_rx->session_timer,
2492 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2493
dd318575 2494 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2495 /* release stored frames up to start of BAR */
d3b2fb53 2496 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2497 start_seq_num, frames);
dd318575
JB		 2498 spin_unlock(&tid_agg_rx->reorder_lock);
2499
6382246e
EG		 2500 drv_event_callback(rx->local, rx->sdata, &event);
2501
a02ae758
JB		 2502 kfree_skb(skb);
2503 return RX_QUEUED;
71364716
RR		 2504 }
2505
08daecae
JB		 2506 /*
2507 * After this point, we only want management frames,
2508 * so we can drop all remaining control frames to
2509 * cooked monitor interfaces.
2510 */
2511 return RX_DROP_MONITOR;
71364716
RR		 2512}
2513
f4f727a6
JM		 2514static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2515 struct ieee80211_mgmt *mgmt,
2516 size_t len)
fea14732
JM		 2517{
2518 struct ieee80211_local *local = sdata->local;
2519 struct sk_buff *skb;
2520 struct ieee80211_mgmt *resp;
2521
b203ca39 2522 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2523 /* Not to own unicast address */
2524 return;
2525 }
2526
b203ca39
JP		 2527 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2528 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2529 /* Not from the current AP or not associated yet. */
fea14732
JM		 2530 return;
2531 }
2532
2533 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2534 /* Too short SA Query request frame */
2535 return;
2536 }
2537
2538 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2539 if (skb == NULL)
2540 return;
2541
2542 skb_reserve(skb, local->hw.extra_tx_headroom);
2543 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2544 memset(resp, 0, 24);
2545 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2546 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2547 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2548 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2549 IEEE80211_STYPE_ACTION);
2550 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2551 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2552 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2553 memcpy(resp->u.action.u.sa_query.trans_id,
2554 mgmt->u.action.u.sa_query.trans_id,
2555 WLAN_SA_QUERY_TR_ID_LEN);
2556
62ae67be 2557 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2558}
2559
2e161f78
JB		 2560static ieee80211_rx_result debug_noinline
2561ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2562{
2563 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2564 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2565
2566 /*
2567 * From here on, look only at management frames.
2568 * Data and control frames are already handled,
2569 * and unknown (reserved) frames are useless.
2570 */
2571 if (rx->skb->len < 24)
2572 return RX_DROP_MONITOR;
2573
2574 if (!ieee80211_is_mgmt(mgmt->frame_control))
2575 return RX_DROP_MONITOR;
2576
ee971924
JB		 2577 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2578 ieee80211_is_beacon(mgmt->frame_control) &&
2579 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2580 int sig = 0;
2581
30686bf7 2582 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2583 sig = status->signal;
2584
ee971924
JB		 2585 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2586 rx->skb->data, rx->skb->len,
37c73b5f 2587 status->freq, sig);
ee971924
JB		 2588 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2589 }
2590
2e161f78
JB		 2591 if (ieee80211_drop_unencrypted_mgmt(rx))
2592 return RX_DROP_UNUSABLE;
2593
2594 return RX_CONTINUE;
2595}
2596
de1ede7a
JB		 2597static ieee80211_rx_result debug_noinline
2598ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2599{
2600 struct ieee80211_local *local = rx->local;
eb9fb5b8 2601 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2602 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2603 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2604 int len = rx->skb->len;
2605
2606 if (!ieee80211_is_action(mgmt->frame_control))
2607 return RX_CONTINUE;
2608
026331c4
JM		 2609 /* drop too small frames */
2610 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2611 return RX_DROP_UNUSABLE;
de1ede7a 2612
815b8092 2613 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2614 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2615 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2616 return RX_DROP_UNUSABLE;
de1ede7a 2617
de1ede7a 2618 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2619 case WLAN_CATEGORY_HT:
2620 /* reject HT action frames from stations not supporting HT */
2621 if (!rx->sta->sta.ht_cap.ht_supported)
2622 goto invalid;
2623
2624 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2625 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2626 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2627 sdata->vif.type != NL80211_IFTYPE_AP &&
2628 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2629 break;
2630
ec61cd63 2631 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2632 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2633 goto invalid;
2634
2635 switch (mgmt->u.action.u.ht_smps.action) {
2636 case WLAN_HT_ACTION_SMPS: {
2637 struct ieee80211_supported_band *sband;
af0ed69b 2638 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2639
2640 /* convert to HT capability */
2641 switch (mgmt->u.action.u.ht_smps.smps_control) {
2642 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2643 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2644 break;
2645 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2646 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2647 break;
2648 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2649 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2650 break;
2651 default:
2652 goto invalid;
2653 }
1d8d3dec
JB		 2654
2655 /* if no change do nothing */
af0ed69b 2656 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2657 goto handled;
af0ed69b 2658 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2659
2660 sband = rx->local->hw.wiphy->bands[status->band];
2661
64f68e5d
JB		 2662 rate_control_rate_update(local, sband, rx->sta,
2663 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2664 goto handled;
2665 }
ec61cd63
JB		 2666 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2667 struct ieee80211_supported_band *sband;
2668 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2669 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2670
2671 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2672 if (!(rx->sta->sta.ht_cap.cap &
2673 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2674 goto handled;
2675
e1a0c6b3 2676 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2677 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2678 else
1c45c5ce
EP		 2679 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2680
2681 /* set cur_max_bandwidth and recalc sta bw */
2682 rx->sta->cur_max_bandwidth = max_bw;
2683 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2684
e1a0c6b3 2685 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2686 goto handled;
2687
1c45c5ce 2688 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2689 sband = rx->local->hw.wiphy->bands[status->band];
2690
2691 rate_control_rate_update(local, sband, rx->sta,
2692 IEEE80211_RC_BW_CHANGED);
2693 goto handled;
2694 }
1d8d3dec
JB		 2695 default:
2696 goto invalid;
2697 }
2698
0af83d3d 2699 break;
1b3a2e49
JB		 2700 case WLAN_CATEGORY_PUBLIC:
2701 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2702 goto invalid;
2703 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2704 break;
2705 if (!rx->sta)
2706 break;
2707 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2708 break;
2709 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2710 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2711 break;
2712 if (len < offsetof(struct ieee80211_mgmt,
2713 u.action.u.ext_chan_switch.variable))
2714 goto invalid;
2715 goto queue;
0af83d3d
JB		 2716 case WLAN_CATEGORY_VHT:
2717 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2718 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2719 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2720 sdata->vif.type != NL80211_IFTYPE_AP &&
2721 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2722 break;
2723
2724 /* verify action code is present */
2725 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2726 goto invalid;
2727
2728 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2729 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2730 u8 opmode;
2731
2732 /* verify opmode is present */
2733 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2734 goto invalid;
2735
2736 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2737
2738 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2739 opmode, status->band,
2740 false);
0af83d3d
JB		 2741 goto handled;
2742 }
2743 default:
2744 break;
2745 }
1d8d3dec 2746 break;
de1ede7a 2747 case WLAN_CATEGORY_BACK:
8abd3f9b 2748 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2749 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2750 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2751 sdata->vif.type != NL80211_IFTYPE_AP &&
2752 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2753 break;
8abd3f9b 2754
026331c4
JM		 2755 /* verify action_code is present */
2756 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2757 break;
2758
de1ede7a
JB		 2759 switch (mgmt->u.action.u.addba_req.action_code) {
2760 case WLAN_ACTION_ADDBA_REQ:
2761 if (len < (IEEE80211_MIN_ACTION_SIZE +
2762 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2763 goto invalid;
2764 break;
de1ede7a
JB		 2765 case WLAN_ACTION_ADDBA_RESP:
2766 if (len < (IEEE80211_MIN_ACTION_SIZE +
2767 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2768 goto invalid;
2769 break;
de1ede7a
JB		 2770 case WLAN_ACTION_DELBA:
2771 if (len < (IEEE80211_MIN_ACTION_SIZE +
2772 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2773 goto invalid;
2774 break;
2775 default:
2776 goto invalid;
de1ede7a 2777 }
bed7ee6e 2778
8b58ff83 2779 goto queue;
39192c0b 2780 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2781 /* verify action_code is present */
2782 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2783 break;
2784
39192c0b
JB		 2785 switch (mgmt->u.action.u.measurement.action_code) {
2786 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2787 if (status->band != IEEE80211_BAND_5GHZ)
2788 break;
2789
39192c0b
JB		 2790 if (len < (IEEE80211_MIN_ACTION_SIZE +
2791 sizeof(mgmt->u.action.u.measurement)))
84040805 2792 break;
cd7760e6
SW		 2793
2794 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2795 break;
2796
39192c0b 2797 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2798 goto handled;
cd7760e6
SW		 2799 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2800 u8 *bssid;
2801 if (len < (IEEE80211_MIN_ACTION_SIZE +
2802 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2803 break;
cc32abd4 2804
cd7760e6 2805 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2806 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2807 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2808 break;
2809
2810 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2811 bssid = sdata->u.mgd.bssid;
2812 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2813 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2814 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2815 bssid = mgmt->sa;
cd7760e6
SW		 2816 else
2817 break;
2818
2819 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2820 break;
c481ec97 2821
8b58ff83 2822 goto queue;
cd7760e6 2823 }
39192c0b
JB		 2824 }
2825 break;
fea14732
JM		 2826 case WLAN_CATEGORY_SA_QUERY:
2827 if (len < (IEEE80211_MIN_ACTION_SIZE +
2828 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2829 break;
2830
fea14732
JM		 2831 switch (mgmt->u.action.u.sa_query.action) {
2832 case WLAN_ACTION_SA_QUERY_REQUEST:
2833 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2834 break;
fea14732 2835 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2836 goto handled;
fea14732
JM		 2837 }
2838 break;
8db09850 2839 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2840 if (len < (IEEE80211_MIN_ACTION_SIZE +
2841 sizeof(mgmt->u.action.u.self_prot.action_code)))
2842 break;
2843
8db09850
TP		 2844 switch (mgmt->u.action.u.self_prot.action_code) {
2845 case WLAN_SP_MESH_PEERING_OPEN:
2846 case WLAN_SP_MESH_PEERING_CLOSE:
2847 case WLAN_SP_MESH_PEERING_CONFIRM:
2848 if (!ieee80211_vif_is_mesh(&sdata->vif))
2849 goto invalid;
a6dad6a2 2850 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2851 /* userspace handles this frame */
2852 break;
2853 goto queue;
2854 case WLAN_SP_MGK_INFORM:
2855 case WLAN_SP_MGK_ACK:
2856 if (!ieee80211_vif_is_mesh(&sdata->vif))
2857 goto invalid;
2858 break;
2859 }
2860 break;
d3aaec8a 2861 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2862 if (len < (IEEE80211_MIN_ACTION_SIZE +
2863 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2864 break;
2865
77a121c3
JB		 2866 if (!ieee80211_vif_is_mesh(&sdata->vif))
2867 break;
25d49e4d 2868 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2869 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2870 break;
2871 goto queue;
84040805 2872 }
026331c4 2873
2e161f78
JB		 2874 return RX_CONTINUE;
2875
bed7ee6e 2876 invalid:
554891e6 2877 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2878 /* will return in the next handlers */
2879 return RX_CONTINUE;
2880
2881 handled:
2882 if (rx->sta)
e5a9f8d0 2883 rx->sta->rx_stats.packets++;
2e161f78
JB		 2884 dev_kfree_skb(rx->skb);
2885 return RX_QUEUED;
2886
2887 queue:
2888 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2889 skb_queue_tail(&sdata->skb_queue, rx->skb);
2890 ieee80211_queue_work(&local->hw, &sdata->work);
2891 if (rx->sta)
e5a9f8d0 2892 rx->sta->rx_stats.packets++;
2e161f78
JB		 2893 return RX_QUEUED;
2894}
2895
2896static ieee80211_rx_result debug_noinline
2897ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2898{
554891e6 2899 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2900 int sig = 0;
2e161f78
JB		 2901
2902 /* skip known-bad action frames and return them in the next handler */
554891e6 2903 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2904 return RX_CONTINUE;
d7907448 2905
026331c4
JM		 2906 /*
2907 * Getting here means the kernel doesn't know how to handle
2908 * it, but maybe userspace does ... include returned frames
2909 * so userspace can register for those to know whether ones
2910 * it transmitted were processed or returned.
2911 */
026331c4 2912
30686bf7 2913 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2914 sig = status->signal;
2915
71bbc994 2916 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2917 rx->skb->data, rx->skb->len, 0)) {
2e161f78 2918 if (rx->sta)
e5a9f8d0 2919 rx->sta->rx_stats.packets++;
2e161f78
JB		 2920 dev_kfree_skb(rx->skb);
2921 return RX_QUEUED;
2922 }
2923
2e161f78
JB		 2924 return RX_CONTINUE;
2925}
2926
2927static ieee80211_rx_result debug_noinline
2928ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2929{
2930 struct ieee80211_local *local = rx->local;
2931 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2932 struct sk_buff *nskb;
2933 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2934 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2935
2936 if (!ieee80211_is_action(mgmt->frame_control))
2937 return RX_CONTINUE;
2938
2939 /*
2940 * For AP mode, hostapd is responsible for handling any action
2941 * frames that we didn't handle, including returning unknown
2942 * ones. For all other modes we will return them to the sender,
2943 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2944 * 802.11-2012 9.24.4.
2e161f78
JB		 2945 * Newer versions of hostapd shall also use the management frame
2946 * registration mechanisms, but older ones still use cooked
2947 * monitor interfaces so push all frames there.
2948 */
554891e6 2949 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2950 (sdata->vif.type == NL80211_IFTYPE_AP ||
2951 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2952 return RX_DROP_MONITOR;
026331c4 2953
4b5ebccc
JB		 2954 if (is_multicast_ether_addr(mgmt->da))
2955 return RX_DROP_MONITOR;
2956
84040805
JB		 2957 /* do not return rejected action frames */
2958 if (mgmt->u.action.category & 0x80)
2959 return RX_DROP_UNUSABLE;
2960
2961 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2962 GFP_ATOMIC);
2963 if (nskb) {
292b4df6 2964 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2965
292b4df6
JL		 2966 nmgmt->u.action.category |= 0x80;
2967 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2968 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2969
2970 memset(nskb->cb, 0, sizeof(nskb->cb));
2971
07e5a5f5
JB		 2972 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2973 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2974
2975 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2976 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2977 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 2978 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 2979 info->hw_queue =
2980 local->hw.offchannel_tx_hw_queue;
2981 }
2982
2983 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2984 status->band);
de1ede7a 2985 }
39192c0b
JB		 2986 dev_kfree_skb(rx->skb);
2987 return RX_QUEUED;
de1ede7a
JB		 2988}
2989
49461622 2990static ieee80211_rx_result debug_noinline
5cf121c3 2991ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2992{
eb9fb5b8 2993 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2994 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2995 __le16 stype;
571ecf67 2996
77a121c3 2997 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2998
77a121c3
JB		 2999 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3000 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3001 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3002 sdata->vif.type != NL80211_IFTYPE_STATION)
3003 return RX_DROP_MONITOR;
472dbc45 3004
77a121c3 3005 switch (stype) {
66e67e41 3006 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3007 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3008 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3009 /* process for all: mesh, mlme, ibss */
3010 break;
66e67e41
JB		 3011 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3012 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3013 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3014 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3015 if (is_multicast_ether_addr(mgmt->da) &&
3016 !is_broadcast_ether_addr(mgmt->da))
3017 return RX_DROP_MONITOR;
3018
77a121c3
JB		 3019 /* process only for station */
3020 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3021 return RX_DROP_MONITOR;
3022 break;
3023 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3024 /* process only for ibss and mesh */
3025 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3026 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3027 return RX_DROP_MONITOR;
3028 break;
3029 default:
3030 return RX_DROP_MONITOR;
3031 }
f9d540ee 3032
77a121c3 3033 /* queue up frame and kick off work to process it */
c1475ca9 3034 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3035 skb_queue_tail(&sdata->skb_queue, rx->skb);
3036 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3037 if (rx->sta)
e5a9f8d0 3038 rx->sta->rx_stats.packets++;
46900298 3039
77a121c3 3040 return RX_QUEUED;
571ecf67
JB		 3041}
3042
5f0b7de5
JB		 3043static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3044 struct ieee80211_rate *rate)
3d30d949
MW		 3045{
3046 struct ieee80211_sub_if_data *sdata;
3047 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3048 struct sk_buff *skb = rx->skb, *skb2;
3049 struct net_device *prev_dev = NULL;
eb9fb5b8 3050 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3051 int needed_headroom;
3d30d949 3052
554891e6
JB		 3053 /*
3054 * If cooked monitor has been processed already, then
3055 * don't do it again. If not, set the flag.
3056 */
3057 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3058 goto out_free_skb;
554891e6 3059 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3060
152c477a
JB		 3061 /* If there are no cooked monitor interfaces, just free the SKB */
3062 if (!local->cooked_mntrs)
3063 goto out_free_skb;
3064
1f7bba79
JB		 3065 /* vendor data is long removed here */
3066 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3067 /* room for the radiotap header based on driver features */
1f7bba79 3068 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3069
293702a3
JB		 3070 if (skb_headroom(skb) < needed_headroom &&
3071 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3072 goto out_free_skb;
3d30d949 3073
293702a3 3074 /* prepend radiotap information */
973ef21a
FF		 3075 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3076 false);
3d30d949
MW		 3077
3078 skb_set_mac_header(skb, 0);
3079 skb->ip_summed = CHECKSUM_UNNECESSARY;
3080 skb->pkt_type = PACKET_OTHERHOST;
3081 skb->protocol = htons(ETH_P_802_2);
3082
3083 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3084 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3085 continue;
3086
05c914fe 3087 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 3088 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3089 continue;
3090
3091 if (prev_dev) {
3092 skb2 = skb_clone(skb, GFP_ATOMIC);
3093 if (skb2) {
3094 skb2->dev = prev_dev;
5548a8a1 3095 netif_receive_skb(skb2);
3d30d949
MW		 3096 }
3097 }
3098
3099 prev_dev = sdata->dev;
5a490510 3100 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3101 }
3102
3103 if (prev_dev) {
3104 skb->dev = prev_dev;
5548a8a1 3105 netif_receive_skb(skb);
554891e6
JB		 3106 return;
3107 }
3d30d949
MW		 3108
3109 out_free_skb:
3110 dev_kfree_skb(skb);
3111}
3112
aa0c8636
CL		 3113static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3114 ieee80211_rx_result res)
3115{
3116 switch (res) {
3117 case RX_DROP_MONITOR:
3118 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3119 if (rx->sta)
e5a9f8d0 3120 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3121 /* fall through */
3122 case RX_CONTINUE: {
3123 struct ieee80211_rate *rate = NULL;
3124 struct ieee80211_supported_band *sband;
3125 struct ieee80211_rx_status *status;
3126
3127 status = IEEE80211_SKB_RXCB((rx->skb));
3128
3129 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3130 if (!(status->flag & RX_FLAG_HT) &&
3131 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3132 rate = &sband->bitrates[status->rate_idx];
3133
3134 ieee80211_rx_cooked_monitor(rx, rate);
3135 break;
3136 }
3137 case RX_DROP_UNUSABLE:
3138 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3139 if (rx->sta)
e5a9f8d0 3140 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3141 dev_kfree_skb(rx->skb);
3142 break;
3143 case RX_QUEUED:
3144 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3145 break;
3146 }
3147}
571ecf67 3148
f9e124fb
CL		 3149static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3150 struct sk_buff_head *frames)
58905290 3151{
58905290 3152 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3153 struct sk_buff *skb;
8944b79f 3154
e32f85f7
LCC		 3155#define CALL_RXH(rxh) \
3156 do { \
3157 res = rxh(rx); \
3158 if (res != RX_CONTINUE) \
2569a826 3159 goto rxh_next; \
e32f85f7 3160 } while (0);
49461622 3161
45ceeee8
JB		 3162 /* Lock here to avoid hitting all of the data used in the RX
3163 * path (e.g. key data, station data, ...) concurrently when
3164 * a frame is released from the reorder buffer due to timeout
3165 * from the timer, potentially concurrently with RX from the
3166 * driver.
3167 */
f9e124fb 3168 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3169
f9e124fb 3170 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3171 /*
3172 * all the other fields are valid across frames
3173 * that belong to an aMPDU since they are on the
3174 * same TID from the same station
3175 */
3176 rx->skb = skb;
3177
2569a826 3178 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 3179 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 3180 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 3181 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 3182 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 3183 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3184 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3185#ifdef CONFIG_MAC80211_MESH
aa0c8636 3186 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3187 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3188#endif
2154c81c 3189 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 3190 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 3191
3192 /* special treatment -- needs the queue */
3193 res = ieee80211_rx_h_ctrl(rx, frames);
3194 if (res != RX_CONTINUE)
3195 goto rxh_next;
3196
2e161f78 3197 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3198 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3199 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3200 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3201 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3202
aa0c8636
CL		 3203 rxh_next:
3204 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3205
49461622 3206#undef CALL_RXH
aa0c8636 3207 }
24a8fdad 3208
f9e124fb 3209 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3210}
3211
4406c376 3212static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3213{
f9e124fb 3214 struct sk_buff_head reorder_release;
aa0c8636
CL		 3215 ieee80211_rx_result res = RX_DROP_MONITOR;
3216
f9e124fb
CL		 3217 __skb_queue_head_init(&reorder_release);
3218
aa0c8636
CL		 3219#define CALL_RXH(rxh) \
3220 do { \
3221 res = rxh(rx); \
3222 if (res != RX_CONTINUE) \
3223 goto rxh_next; \
3224 } while (0);
3225
0395442a 3226 CALL_RXH(ieee80211_rx_h_check_dup)
aa0c8636
CL		 3227 CALL_RXH(ieee80211_rx_h_check)
3228
f9e124fb 3229 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3230
f9e124fb 3231 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3232 return;
49461622 3233
2569a826 3234 rxh_next:
aa0c8636
CL		 3235 ieee80211_rx_handlers_result(rx, res);
3236
3237#undef CALL_RXH
58905290
JB		 3238}
3239
2bff8ebf 3240/*
dd318575
JB		 3241 * This function makes calls into the RX path, therefore
3242 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3243 */
3244void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3245{
f9e124fb 3246 struct sk_buff_head frames;
554891e6
JB		 3247 struct ieee80211_rx_data rx = {
3248 .sta = sta,
3249 .sdata = sta->sdata,
3250 .local = sta->local,
9e26297a
JB		 3251 /* This is OK -- must be QoS data frame */
3252 .security_idx = tid,
3253 .seqno_idx = tid,
af9f9b22 3254 .napi = NULL, /* must be NULL to not have races */
554891e6 3255 };
2c15a0cf
CL		 3256 struct tid_ampdu_rx *tid_agg_rx;
3257
3258 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3259 if (!tid_agg_rx)
3260 return;
2bff8ebf 3261
f9e124fb
CL		 3262 __skb_queue_head_init(&frames);
3263
2c15a0cf 3264 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3265 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3266 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3267
b497de63
EG		 3268 if (!skb_queue_empty(&frames)) {
3269 struct ieee80211_event event = {
3270 .type = BA_FRAME_TIMEOUT,
3271 .u.ba.tid = tid,
3272 .u.ba.sta = &sta->sta,
3273 };
3274 drv_event_callback(rx.local, rx.sdata, &event);
3275 }
3276
f9e124fb 3277 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3278}
3279
571ecf67
JB		 3280/* main receive path */
3281
a58fbe1a 3282static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3283{
20b01f80 3284 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3285 struct sk_buff *skb = rx->skb;
a58fbe1a 3286 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3287 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3288 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3289 int multicast = is_multicast_ether_addr(hdr->addr1);
3290
51fb61e7 3291 switch (sdata->vif.type) {
05c914fe 3292 case NL80211_IFTYPE_STATION:
9bc383de 3293 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3294 return false;
a58fbe1a
JB		 3295 if (multicast)
3296 return true;
3297 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3298 case NL80211_IFTYPE_ADHOC:
23a24def 3299 if (!bssid)
3c2723f5 3300 return false;
6329b8d9
FF		 3301 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3302 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3303 return false;
a58fbe1a 3304 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3305 return true;
a58fbe1a 3306 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3307 return false;
a58fbe1a
JB		 3308 if (!multicast &&
3309 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3310 return false;
a58fbe1a 3311 if (!rx->sta) {
0fb8ca45 3312 int rate_idx;
5614618e
JB		 3313 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3314 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3315 else
eb9fb5b8 3316 rate_idx = status->rate_idx;
8bf11d8d
JB		 3317 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3318 BIT(rate_idx));
0fb8ca45 3319 }
a58fbe1a 3320 return true;
239281f8
RL		 3321 case NL80211_IFTYPE_OCB:
3322 if (!bssid)
3323 return false;
cc117298 3324 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3325 return false;
a58fbe1a 3326 if (!is_broadcast_ether_addr(bssid))
239281f8 3327 return false;
a58fbe1a
JB		 3328 if (!multicast &&
3329 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3330 return false;
a58fbe1a 3331 if (!rx->sta) {
239281f8
RL		 3332 int rate_idx;
3333 if (status->flag & RX_FLAG_HT)
3334 rate_idx = 0; /* TODO: HT rates */
3335 else
3336 rate_idx = status->rate_idx;
3337 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3338 BIT(rate_idx));
3339 }
a58fbe1a 3340 return true;
05c914fe 3341 case NL80211_IFTYPE_MESH_POINT:
a58fbe1a
JB		 3342 if (multicast)
3343 return true;
3344 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3345 case NL80211_IFTYPE_AP_VLAN:
3346 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3347 if (!bssid)
3348 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3349
3350 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3351 /*
3352 * Accept public action frames even when the
3353 * BSSID doesn't match, this is used for P2P
3354 * and location updates. Note that mac80211
3355 * itself never looks at these frames.
3356 */
2b9ccd4e
JB		 3357 if (!multicast &&
3358 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3359 return false;
d48b2968 3360 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3361 return true;
5c90067c 3362 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3363 }
3364
3365 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3366 /* ignore data frames to TDLS-peers */
3367 if (ieee80211_is_data(hdr->frame_control))
3368 return false;
3369 /* ignore action frames to TDLS-peers */
3370 if (ieee80211_is_action(hdr->frame_control) &&
3371 !ether_addr_equal(bssid, hdr->addr1))
3372 return false;
23a24def 3373 }
a58fbe1a 3374 return true;
05c914fe 3375 case NL80211_IFTYPE_WDS:
a7767f95 3376 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3377 return false;
a58fbe1a 3378 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3379 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3380 return ieee80211_is_public_action(hdr, skb->len) ||
3381 ieee80211_is_probe_req(hdr->frame_control) ||
3382 ieee80211_is_probe_resp(hdr->frame_control) ||
3383 ieee80211_is_beacon(hdr->frame_control);
2ca27bcf 3384 default:
fb1c1cd6 3385 break;
23a24def
JB		 3386 }
3387
a58fbe1a
JB		 3388 WARN_ON_ONCE(1);
3389 return false;
23a24def
JB		 3390}
3391
4406c376
JB		 3392/*
3393 * This function returns whether or not the SKB
3394 * was destined for RX processing or not, which,
3395 * if consume is true, is equivalent to whether
3396 * or not the skb was consumed.
3397 */
3398static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3399 struct sk_buff *skb, bool consume)
3400{
3401 struct ieee80211_local *local = rx->local;
3402 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 3403
3404 rx->skb = skb;
4406c376 3405
a58fbe1a 3406 if (!ieee80211_accept_frame(rx))
4406c376
JB		 3407 return false;
3408
4406c376
JB		 3409 if (!consume) {
3410 skb = skb_copy(skb, GFP_ATOMIC);
3411 if (!skb) {
3412 if (net_ratelimit())
3413 wiphy_debug(local->hw.wiphy,
b305dae4 3414 "failed to copy skb for %s\n",
4406c376
JB		 3415 sdata->name);
3416 return true;
3417 }
3418
3419 rx->skb = skb;
3420 }
3421
3422 ieee80211_invoke_rx_handlers(rx);
3423 return true;
3424}
3425
571ecf67 3426/*
6b59db7d 3427 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3428 * be called with rcu_read_lock protection.
571ecf67 3429 */
71ebb4aa 3430static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
af9f9b22
JB		 3431 struct sk_buff *skb,
3432 struct napi_struct *napi)
571ecf67
JB		 3433{
3434 struct ieee80211_local *local = hw_to_local(hw);
3435 struct ieee80211_sub_if_data *sdata;
571ecf67 3436 struct ieee80211_hdr *hdr;
e3cf8b3f 3437 __le16 fc;
5cf121c3 3438 struct ieee80211_rx_data rx;
4406c376 3439 struct ieee80211_sub_if_data *prev;
7bedd0cf
JB		 3440 struct sta_info *sta, *prev_sta;
3441 struct rhash_head *tmp;
e3cf8b3f 3442 int err = 0;
571ecf67 3443
e3cf8b3f 3444 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3445 memset(&rx, 0, sizeof(rx));
3446 rx.skb = skb;
3447 rx.local = local;
af9f9b22 3448 rx.napi = napi;
72abd81b 3449
e3cf8b3f 3450 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 3451 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 3452
4a4f1a58
JB		 3453 if (ieee80211_is_mgmt(fc)) {
3454 /* drop frame if too short for header */
3455 if (skb->len < ieee80211_hdrlen(fc))
3456 err = -ENOBUFS;
3457 else
3458 err = skb_linearize(skb);
3459 } else {
e3cf8b3f 3460 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3461 }
e3cf8b3f
ZY		 3462
3463 if (err) {
3464 dev_kfree_skb(skb);
3465 return;
3466 }
3467
3468 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3469 ieee80211_parse_qos(&rx);
d1c3a37c 3470 ieee80211_verify_alignment(&rx);
38f3714d 3471
d48b2968
JB		 3472 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3473 ieee80211_is_beacon(hdr->frame_control)))
3474 ieee80211_scan_rx(local, skb);
3475
e3cf8b3f 3476 if (ieee80211_is_data(fc)) {
7bedd0cf
JB		 3477 const struct bucket_table *tbl;
3478
56af3268 3479 prev_sta = NULL;
4406c376 3480
7bedd0cf
JB		 3481 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3482
3483 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
56af3268
BG		 3484 if (!prev_sta) {
3485 prev_sta = sta;
3486 continue;
3487 }
3488
3489 rx.sta = prev_sta;
3490 rx.sdata = prev_sta->sdata;
4406c376 3491 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3492
56af3268 3493 prev_sta = sta;
4406c376 3494 }
56af3268
BG		 3495
3496 if (prev_sta) {
3497 rx.sta = prev_sta;
3498 rx.sdata = prev_sta->sdata;
3499
4406c376 3500 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3501 return;
8e26d5ad 3502 goto out;
56af3268 3503 }
4406c376
JB		 3504 }
3505
4b0dd98e 3506 prev = NULL;
b2e7771e 3507
4b0dd98e
JB		 3508 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3509 if (!ieee80211_sdata_running(sdata))
3510 continue;
340e11f3 3511
4b0dd98e
JB		 3512 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3513 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3514 continue;
340e11f3 3515
4b0dd98e
JB		 3516 /*
3517 * frame is destined for this interface, but if it's
3518 * not also for the previous one we handle that after
3519 * the loop to avoid copying the SKB once too much
3520 */
4bb29f8c 3521
4b0dd98e 3522 if (!prev) {
abe60632 3523 prev = sdata;
4b0dd98e 3524 continue;
340e11f3 3525 }
4bb29f8c 3526
7852e361 3527 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3528 rx.sdata = prev;
3529 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3530
4b0dd98e
JB		 3531 prev = sdata;
3532 }
3533
3534 if (prev) {
7852e361 3535 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3536 rx.sdata = prev;
4406c376 3537
4b0dd98e
JB		 3538 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3539 return;
571ecf67 3540 }
4406c376 3541
8e26d5ad 3542 out:
4406c376 3543 dev_kfree_skb(skb);
571ecf67 3544}
6368e4b1
RR		 3545
3546/*
3547 * This is the receive path handler. It is called by a low level driver when an
3548 * 802.11 MPDU is received from the hardware.
3549 */
af9f9b22
JB		 3550void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3551 struct napi_struct *napi)
6368e4b1
RR		 3552{
3553 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3554 struct ieee80211_rate *rate = NULL;
3555 struct ieee80211_supported_band *sband;
f1d58c25 3556 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3557
d20ef63d
JB		 3558 WARN_ON_ONCE(softirq_count() == 0);
3559
444e3803 3560 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3561 goto drop;
8318d78a
JB		 3562
3563 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3564 if (WARN_ON(!sband))
3565 goto drop;
8318d78a 3566
89c3a8ac
JB		 3567 /*
3568 * If we're suspending, it is possible although not too likely
3569 * that we'd be receiving frames after having already partially
3570 * quiesced the stack. We can't process such frames then since
3571 * that might, for example, cause stations to be added or other
3572 * driver callbacks be invoked.
3573 */
77a980dc
JB		 3574 if (unlikely(local->quiescing || local->suspended))
3575 goto drop;
89c3a8ac 3576
04800ada
AN		 3577 /* We might be during a HW reconfig, prevent Rx for the same reason */
3578 if (unlikely(local->in_reconfig))
3579 goto drop;
3580
ea77f12f
JB		 3581 /*
3582 * The same happens when we're not even started,
3583 * but that's worth a warning.
3584 */
77a980dc
JB		 3585 if (WARN_ON(!local->started))
3586 goto drop;
ea77f12f 3587
fc885189 3588 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3589 /*
fc885189
JB		 3590 * Validate the rate, unless a PLCP error means that
3591 * we probably can't have a valid rate here anyway.
e5d6eb83 3592 */
fc885189
JB		 3593
3594 if (status->flag & RX_FLAG_HT) {
3595 /*
3596 * rate_idx is MCS index, which can be [0-76]
3597 * as documented on:
3598 *
3599 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3600 *
3601 * Anything else would be some sort of driver or
3602 * hardware error. The driver should catch hardware
3603 * errors.
3604 */
444e3803 3605 if (WARN(status->rate_idx > 76,
fc885189
JB		 3606 "Rate marked as an HT rate but passed "
3607 "status->rate_idx is not "
3608 "an MCS index [0-76]: %d (0x%02x)\n",
3609 status->rate_idx,
3610 status->rate_idx))
3611 goto drop;
5614618e
JB		 3612 } else if (status->flag & RX_FLAG_VHT) {
3613 if (WARN_ONCE(status->rate_idx > 9 ||
3614 !status->vht_nss ||
3615 status->vht_nss > 8,
3616 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3617 status->rate_idx, status->vht_nss))
3618 goto drop;
fc885189 3619 } else {
444e3803 3620 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3621 goto drop;
3622 rate = &sband->bitrates[status->rate_idx];
3623 }
0fb8ca45 3624 }
6368e4b1 3625
554891e6
JB		 3626 status->rx_flags = 0;
3627
6368e4b1
RR		 3628 /*
3629 * key references and virtual interfaces are protected using RCU
3630 * and this requires that we are in a read-side RCU section during
3631 * receive processing
3632 */
3633 rcu_read_lock();
3634
3635 /*
3636 * Frames with failed FCS/PLCP checksum are not returned,
3637 * all other frames are returned without radiotap header
3638 * if it was previously present.
3639 * Also, frames with less than 16 bytes are dropped.
3640 */
f1d58c25 3641 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3642 if (!skb) {
3643 rcu_read_unlock();
3644 return;
3645 }
3646
e1e54068
JB		 3647 ieee80211_tpt_led_trig_rx(local,
3648 ((struct ieee80211_hdr *)skb->data)->frame_control,
3649 skb->len);
af9f9b22 3650 __ieee80211_rx_handle_packet(hw, skb, napi);
6368e4b1
RR		 3651
3652 rcu_read_unlock();
77a980dc
JB		 3653
3654 return;
3655 drop:
3656 kfree_skb(skb);
6368e4b1 3657}
af9f9b22 3658EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 3659
3660/* This is a version of the rx handler that can be called from hard irq
3661 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3662void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3663{
3664 struct ieee80211_local *local = hw_to_local(hw);
3665
3666 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3667
571ecf67
JB		 3668 skb->pkt_type = IEEE80211_RX_MSG;
3669 skb_queue_tail(&local->skb_queue, skb);
3670 tasklet_schedule(&local->tasklet);
3671}
3672EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)