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Merge branches 'acpi-soc', 'acpi-misc', 'acpi-pci' and 'device-properties'
[deliverable/linux.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
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 663#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
441275e1 664 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
d1c3a37c 665#endif
6e0d114d
JB		 666}
667
6368e4b1 668
571ecf67
JB		 669/* rx handlers */
670
3cfcf6ac
JM		 671static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
672{
673 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
674
d8ca16db 675 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 676 return 0;
677
d8ca16db 678 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 679}
680
681
682static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
683{
684 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
685
d8ca16db 686 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 687 return 0;
688
d8ca16db 689 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 690}
691
692
693/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
694static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
695{
696 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
697 struct ieee80211_mmie *mmie;
56c52da2 698 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 699
1df332e8 700 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 701 return -1;
702
d8ca16db 703 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 704 return -1; /* not a robust management frame */
705
706 mmie = (struct ieee80211_mmie *)
707 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 708 if (mmie->element_id == WLAN_EID_MMIE &&
709 mmie->length == sizeof(*mmie) - 2)
710 return le16_to_cpu(mmie->key_id);
711
712 mmie16 = (struct ieee80211_mmie_16 *)
713 (skb->data + skb->len - sizeof(*mmie16));
714 if (skb->len >= 24 + sizeof(*mmie16) &&
715 mmie16->element_id == WLAN_EID_MMIE &&
716 mmie16->length == sizeof(*mmie16) - 2)
717 return le16_to_cpu(mmie16->key_id);
718
719 return -1;
3cfcf6ac
JM		 720}
721
2475b1cc
MS		 722static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
723 struct sk_buff *skb)
724{
725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
726 __le16 fc;
727 int hdrlen;
728 u8 keyid;
729
730 fc = hdr->frame_control;
731 hdrlen = ieee80211_hdrlen(fc);
732
733 if (skb->len < hdrlen + cs->hdr_len)
734 return -EINVAL;
735
736 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
737 keyid &= cs->key_idx_mask;
738 keyid >>= cs->key_idx_shift;
739
740 return keyid;
741}
742
1df332e8 743static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 744{
a7767f95 745 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 746 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 747
a7767f95 748 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 749 if (is_multicast_ether_addr(hdr->addr1)) {
750 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 751 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 752 return RX_DROP_MONITOR;
b203ca39 753 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 754 return RX_DROP_MONITOR;
755 } else {
756 if (!ieee80211_has_a4(hdr->frame_control))
757 return RX_DROP_MONITOR;
b203ca39 758 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 759 return RX_DROP_MONITOR;
760 }
33b64eb2
LCC		 761 }
762
763 /* If there is not an established peer link and this is not a peer link
764 * establisment frame, beacon or probe, drop the frame.
765 */
766
57cf8043 767 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 768 struct ieee80211_mgmt *mgmt;
d6d1a5a7 769
a7767f95 770 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 771 return RX_DROP_MONITOR;
772
a7767f95 773 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 774 u8 category;
9b395bc3
JB		 775
776 /* make sure category field is present */
777 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
778 return RX_DROP_MONITOR;
779
33b64eb2 780 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 781 category = mgmt->u.action.category;
782 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 783 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 784 return RX_DROP_MONITOR;
33b64eb2 785 return RX_CONTINUE;
33b64eb2
LCC		 786 }
787
a7767f95
HH		 788 if (ieee80211_is_probe_req(hdr->frame_control) ||
789 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 790 ieee80211_is_beacon(hdr->frame_control) ||
791 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 792 return RX_CONTINUE;
793
794 return RX_DROP_MONITOR;
a7767f95
HH		 795 }
796
902acc78
JB		 797 return RX_CONTINUE;
798}
33b64eb2 799
d3b2fb53 800static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 801 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 802 int index,
803 struct sk_buff_head *frames)
1edfb1af 804{
83eb935e
MK		 805 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
806 struct sk_buff *skb;
4cfda47b 807 struct ieee80211_rx_status *status;
1edfb1af 808
dd318575
JB		 809 lockdep_assert_held(&tid_agg_rx->reorder_lock);
810
83eb935e 811 if (skb_queue_empty(skb_list))
1edfb1af
JB		 812 goto no_frame;
813
83eb935e
MK		 814 if (!ieee80211_rx_reorder_ready(skb_list)) {
815 __skb_queue_purge(skb_list);
816 goto no_frame;
817 }
818
819 /* release frames from the reorder ring buffer */
1edfb1af 820 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 821 while ((skb = __skb_dequeue(skb_list))) {
822 status = IEEE80211_SKB_RXCB(skb);
823 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
824 __skb_queue_tail(frames, skb);
825 }
1edfb1af
JB		 826
827no_frame:
9a886586 828 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 829}
830
d3b2fb53 831static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 832 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 833 u16 head_seq_num,
834 struct sk_buff_head *frames)
1edfb1af
JB		 835{
836 int index;
837
dd318575
JB		 838 lockdep_assert_held(&tid_agg_rx->reorder_lock);
839
9a886586 840 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 841 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 842 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
843 frames);
1edfb1af
JB		 844 }
845}
846
847/*
848 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
849 * the skb was added to the buffer longer than this time ago, the earlier
850 * frames that have not yet been received are assumed to be lost and the skb
851 * can be released for processing. This may also release other skb's from the
852 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 853 *
854 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 855 */
856#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
857
d3b2fb53 858static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 859 struct tid_ampdu_rx *tid_agg_rx,
860 struct sk_buff_head *frames)
aa0c8636 861{
83eb935e 862 int index, i, j;
aa0c8636 863
dd318575
JB		 864 lockdep_assert_held(&tid_agg_rx->reorder_lock);
865
aa0c8636 866 /* release the buffer until next missing frame */
2e3049b7 867 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
83eb935e 868 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
07ae2dfc 869 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 870 /*
871 * No buffers ready to be released, but check whether any
872 * frames in the reorder buffer have timed out.
873 */
aa0c8636
CL		 874 int skipped = 1;
875 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
876 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 877 if (!ieee80211_rx_reorder_ready(
878 &tid_agg_rx->reorder_buf[j])) {
aa0c8636
CL		 879 skipped++;
880 continue;
881 }
499fe9a4
DH		 882 if (skipped &&
883 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 884 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 885 goto set_release_timer;
aa0c8636 886
83eb935e
MK		 887 /* don't leave incomplete A-MSDUs around */
888 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
889 i = (i + 1) % tid_agg_rx->buf_size)
890 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
891
bdcbd8e0
JB		 892 ht_dbg_ratelimited(sdata,
893 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 894 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
895 frames);
aa0c8636
CL		 896
897 /*
898 * Increment the head seq# also for the skipped slots.
899 */
900 tid_agg_rx->head_seq_num =
9a886586
JB		 901 (tid_agg_rx->head_seq_num +
902 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 903 skipped = 0;
904 }
83eb935e
MK		 905 } else while (ieee80211_rx_reorder_ready(
906 &tid_agg_rx->reorder_buf[index])) {
f9e124fb
CL		 907 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
908 frames);
2e3049b7 909 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 910 }
2bff8ebf
CL		 911
912 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 913 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 914
915 for (; j != (index - 1) % tid_agg_rx->buf_size;
916 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 917 if (ieee80211_rx_reorder_ready(
918 &tid_agg_rx->reorder_buf[j]))
2bff8ebf
CL		 919 break;
920 }
921
922 set_release_timer:
923
788211d8
JB		 924 if (!tid_agg_rx->removed)
925 mod_timer(&tid_agg_rx->reorder_timer,
926 tid_agg_rx->reorder_time[j] + 1 +
927 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 928 } else {
929 del_timer(&tid_agg_rx->reorder_timer);
930 }
aa0c8636
CL		 931}
932
1edfb1af
JB		 933/*
934 * As this function belongs to the RX path it must be under
935 * rcu_read_lock protection. It returns false if the frame
936 * can be processed immediately, true if it was consumed.
937 */
d3b2fb53 938static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 939 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 940 struct sk_buff *skb,
941 struct sk_buff_head *frames)
1edfb1af
JB		 942{
943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 945 u16 sc = le16_to_cpu(hdr->seq_ctrl);
946 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
947 u16 head_seq_num, buf_size;
948 int index;
2bff8ebf 949 bool ret = true;
1edfb1af 950
dd318575
JB		 951 spin_lock(&tid_agg_rx->reorder_lock);
952
4549cf2b
MK		 953 /*
954 * Offloaded BA sessions have no known starting sequence number so pick
955 * one from first Rxed frame for this tid after BA was started.
956 */
957 if (unlikely(tid_agg_rx->auto_seq)) {
958 tid_agg_rx->auto_seq = false;
959 tid_agg_rx->ssn = mpdu_seq_num;
960 tid_agg_rx->head_seq_num = mpdu_seq_num;
961 }
962
1edfb1af
JB		 963 buf_size = tid_agg_rx->buf_size;
964 head_seq_num = tid_agg_rx->head_seq_num;
965
966 /* frame with out of date sequence number */
9a886586 967 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 968 dev_kfree_skb(skb);
2bff8ebf 969 goto out;
1edfb1af
JB		 970 }
971
972 /*
973 * If frame the sequence number exceeds our buffering window
974 * size release some previous frames to make room for this one.
975 */
9a886586
JB		 976 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
977 head_seq_num = ieee80211_sn_inc(
978 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 979 /* release stored frames up to new head to stack */
d3b2fb53 980 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 981 head_seq_num, frames);
1edfb1af
JB		 982 }
983
984 /* Now the new frame is always in the range of the reordering buffer */
985
2e3049b7 986 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 987
988 /* check if we already stored this frame */
83eb935e 989 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
1edfb1af 990 dev_kfree_skb(skb);
2bff8ebf 991 goto out;
1edfb1af
JB		 992 }
993
994 /*
995 * If the current MPDU is in the right order and nothing else
996 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 997 * If it is first but there's something stored, we may be able
998 * to release frames after this one.
1edfb1af
JB		 999 */
1000 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1001 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 1002 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1003 tid_agg_rx->head_seq_num =
1004 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 1005 ret = false;
1006 goto out;
1edfb1af
JB		 1007 }
1008
1009 /* put the frame in the reordering buffer */
83eb935e
MK		 1010 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1011 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1012 tid_agg_rx->reorder_time[index] = jiffies;
1013 tid_agg_rx->stored_mpdu_num++;
1014 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1015 }
1edfb1af 1016
2bff8ebf
CL		 1017 out:
1018 spin_unlock(&tid_agg_rx->reorder_lock);
1019 return ret;
1edfb1af
JB		 1020}
1021
1022/*
1023 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1024 * true if the MPDU was buffered, false if it should be processed.
1025 */
f9e124fb
CL		 1026static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1027 struct sk_buff_head *frames)
1edfb1af 1028{
2569a826
JB		 1029 struct sk_buff *skb = rx->skb;
1030 struct ieee80211_local *local = rx->local;
1edfb1af 1031 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 1032 struct sta_info *sta = rx->sta;
1edfb1af
JB		 1033 struct tid_ampdu_rx *tid_agg_rx;
1034 u16 sc;
6cc00d54 1035 u8 tid, ack_policy;
1edfb1af 1036
051a41fa
JB		 1037 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1038 is_multicast_ether_addr(hdr->addr1))
2569a826 1039 goto dont_reorder;
1edfb1af
JB		 1040
1041 /*
1042 * filter the QoS data rx stream according to
1043 * STA/TID and check if this STA/TID is on aggregation
1044 */
1045
1edfb1af 1046 if (!sta)
2569a826 1047 goto dont_reorder;
1edfb1af 1048
6cc00d54
TP		 1049 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1050 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1051 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1052
a87f736d
JB		 1053 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1054 if (!tid_agg_rx)
1055 goto dont_reorder;
1edfb1af
JB		 1056
1057 /* qos null data frames are excluded */
1058 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1059 goto dont_reorder;
1edfb1af 1060
6cc00d54
TP		 1061 /* not part of a BA session */
1062 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1063 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1064 goto dont_reorder;
1065
1edfb1af
JB		 1066 /* new, potentially un-ordered, ampdu frame - process it */
1067
1068 /* reset session timer */
1069 if (tid_agg_rx->timeout)
12d3952f 1070 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1071
1072 /* if this mpdu is fragmented - terminate rx aggregation session */
1073 sc = le16_to_cpu(hdr->seq_ctrl);
1074 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1075 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1076 skb_queue_tail(&rx->sdata->skb_queue, skb);
1077 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1078 return;
1edfb1af
JB		 1079 }
1080
a87f736d
JB		 1081 /*
1082 * No locking needed -- we will only ever process one
1083 * RX packet at a time, and thus own tid_agg_rx. All
1084 * other code manipulating it needs to (and does) make
1085 * sure that we cannot get to it any more before doing
1086 * anything with it.
1087 */
f9e124fb
CL		 1088 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1089 frames))
2569a826
JB		 1090 return;
1091
1092 dont_reorder:
f9e124fb 1093 __skb_queue_tail(frames, skb);
1edfb1af 1094}
33b64eb2 1095
49461622 1096static ieee80211_rx_result debug_noinline
0395442a 1097ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1098{
a7767f95 1099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1100 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1101
6b0f3274
JB		 1102 /*
1103 * Drop duplicate 802.11 retransmissions
1104 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1105 */
0395442a
JB		 1106
1107 if (rx->skb->len < 24)
1108 return RX_CONTINUE;
1109
1110 if (ieee80211_is_ctl(hdr->frame_control) ||
1111 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1112 is_multicast_ether_addr(hdr->addr1))
1113 return RX_CONTINUE;
1114
a732fa70
JB		 1115 if (!rx->sta)
1116 return RX_CONTINUE;
1117
1118 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1119 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1120 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
e5a9f8d0 1121 rx->sta->rx_stats.num_duplicates++;
a732fa70
JB		 1122 return RX_DROP_UNUSABLE;
1123 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1124 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 1125 }
1126
0395442a
JB		 1127 return RX_CONTINUE;
1128}
1129
1130static ieee80211_rx_result debug_noinline
1131ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1132{
1133 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1134
571ecf67
JB		 1135 /* Drop disallowed frame classes based on STA auth/assoc state;
1136 * IEEE 802.11, Chap 5.5.
1137 *
ccd7b362
JB		 1138 * mac80211 filters only based on association state, i.e. it drops
1139 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1140 * deauth/disassoc frames when needed. In addition, hostapd is
1141 * responsible for filtering on both auth and assoc states.
1142 */
33b64eb2 1143
902acc78 1144 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1145 return ieee80211_rx_mesh_check(rx);
33b64eb2 1146
a7767f95
HH		 1147 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1148 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1149 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1150 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1151 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1152 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1153 /*
1154 * accept port control frames from the AP even when it's not
1155 * yet marked ASSOC to prevent a race where we don't set the
1156 * assoc bit quickly enough before it sends the first frame
1157 */
1158 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1159 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1160 unsigned int hdrlen;
1161 __be16 ethertype;
1162
1163 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1164
1165 if (rx->skb->len < hdrlen + 8)
1166 return RX_DROP_MONITOR;
1167
1168 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1169 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1170 return RX_CONTINUE;
1171 }
21fc7560
JB		 1172
1173 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1174 cfg80211_rx_spurious_frame(rx->sdata->dev,
1175 hdr->addr2,
1176 GFP_ATOMIC))
1177 return RX_DROP_UNUSABLE;
1178
e4c26add 1179 return RX_DROP_MONITOR;
2a33bee2 1180 }
571ecf67 1181
9ae54c84 1182 return RX_CONTINUE;
570bd537
JB		 1183}
1184
1185
572e0012
KV		 1186static ieee80211_rx_result debug_noinline
1187ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1188{
1189 struct ieee80211_local *local;
1190 struct ieee80211_hdr *hdr;
1191 struct sk_buff *skb;
1192
1193 local = rx->local;
1194 skb = rx->skb;
1195 hdr = (struct ieee80211_hdr *) skb->data;
1196
1197 if (!local->pspolling)
1198 return RX_CONTINUE;
1199
1200 if (!ieee80211_has_fromds(hdr->frame_control))
1201 /* this is not from AP */
1202 return RX_CONTINUE;
1203
1204 if (!ieee80211_is_data(hdr->frame_control))
1205 return RX_CONTINUE;
1206
1207 if (!ieee80211_has_moredata(hdr->frame_control)) {
1208 /* AP has no more frames buffered for us */
1209 local->pspolling = false;
1210 return RX_CONTINUE;
1211 }
1212
1213 /* more data bit is set, let's request a new frame from the AP */
1214 ieee80211_send_pspoll(local, rx->sdata);
1215
1216 return RX_CONTINUE;
1217}
1218
d012a605 1219static void sta_ps_start(struct sta_info *sta)
571ecf67 1220{
133b8226 1221 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1222 struct ieee80211_local *local = sdata->local;
d012a605 1223 struct ps_data *ps;
ba8c3d6f 1224 int tid;
0795af57 1225
d012a605
MP		 1226 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1227 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1228 ps = &sdata->bss->ps;
1229 else
1230 return;
1231
1232 atomic_inc(&ps->num_sta_ps);
c2c98fde 1233 set_sta_flag(sta, WLAN_STA_PS_STA);
30686bf7 1234 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
d057e5a3 1235 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1236 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1237 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1238
17c18bf8
JB		 1239 ieee80211_clear_fast_xmit(sta);
1240
ba8c3d6f
FF		 1241 if (!sta->sta.txq[0])
1242 return;
1243
1244 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1245 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1246
1247 if (!skb_queue_len(&txqi->queue))
1248 set_bit(tid, &sta->txq_buffered_tids);
1249 else
1250 clear_bit(tid, &sta->txq_buffered_tids);
1251 }
571ecf67
JB		 1252}
1253
d012a605 1254static void sta_ps_end(struct sta_info *sta)
571ecf67 1255{
bdcbd8e0
JB		 1256 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1257 sta->sta.addr, sta->sta.aid);
004c872e 1258
c2c98fde 1259 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1260 /*
1261 * Clear the flag only if the other one is still set
1262 * so that the TX path won't start TX'ing new frames
1263 * directly ... In the case that the driver flag isn't
1264 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1265 */
1266 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1267 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1268 sta->sta.addr, sta->sta.aid);
af818581
JB		 1269 return;
1270 }
1271
5ac2e350
JB		 1272 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1273 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1274 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1275}
1276
cf47161a 1277int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
d057e5a3 1278{
cf47161a 1279 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
d057e5a3
AN		 1280 bool in_ps;
1281
cf47161a 1282 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
d057e5a3
AN		 1283
1284 /* Don't let the same PS state be set twice */
cf47161a 1285 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1286 if ((start && in_ps) || (!start && !in_ps))
1287 return -EINVAL;
1288
1289 if (start)
cf47161a 1290 sta_ps_start(sta);
d057e5a3 1291 else
cf47161a 1292 sta_ps_end(sta);
d057e5a3
AN		 1293
1294 return 0;
1295}
1296EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1297
47086fc5
JB		 1298static ieee80211_rx_result debug_noinline
1299ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1300{
1301 struct ieee80211_sub_if_data *sdata = rx->sdata;
1302 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1303 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1304 int tid, ac;
1305
5c90067c 1306 if (!rx->sta)
47086fc5
JB		 1307 return RX_CONTINUE;
1308
1309 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1310 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1311 return RX_CONTINUE;
1312
1313 /*
1314 * The device handles station powersave, so don't do anything about
1315 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1316 * it to mac80211 since they're handled.)
1317 */
30686bf7 1318 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
47086fc5
JB		 1319 return RX_CONTINUE;
1320
1321 /*
1322 * Don't do anything if the station isn't already asleep. In
1323 * the uAPSD case, the station will probably be marked asleep,
1324 * in the PS-Poll case the station must be confused ...
1325 */
c2c98fde 1326 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1327 return RX_CONTINUE;
1328
1329 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1330 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1331 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1332 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1333 else
c2c98fde 1334 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1335 }
47086fc5
JB		 1336
1337 /* Free PS Poll skb here instead of returning RX_DROP that would
1338 * count as an dropped frame. */
1339 dev_kfree_skb(rx->skb);
1340
1341 return RX_QUEUED;
1342 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1343 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1344 ieee80211_has_pm(hdr->frame_control) &&
1345 (ieee80211_is_data_qos(hdr->frame_control) ||
1346 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1347 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1348 ac = ieee802_1d_to_ac[tid & 7];
1349
1350 /*
1351 * If this AC is not trigger-enabled do nothing.
1352 *
1353 * NB: This could/should check a separate bitmap of trigger-
1354 * enabled queues, but for now we only implement uAPSD w/o
1355 * TSPEC changes to the ACs, so they're always the same.
1356 */
1357 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1358 return RX_CONTINUE;
1359
1360 /* if we are in a service period, do nothing */
c2c98fde 1361 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1362 return RX_CONTINUE;
1363
c2c98fde 1364 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1365 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1366 else
c2c98fde 1367 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1368 }
1369
1370 return RX_CONTINUE;
1371}
1372
49461622 1373static ieee80211_rx_result debug_noinline
5cf121c3 1374ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1375{
1376 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1377 struct sk_buff *skb = rx->skb;
1378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1380 int i;
571ecf67
JB		 1381
1382 if (!sta)
9ae54c84 1383 return RX_CONTINUE;
571ecf67 1384
b291ba11
JB		 1385 /*
1386 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1387 * BSSID and for station already AUTHORIZED to avoid keeping the
1388 * current IBSS network alive in cases where other STAs start
1389 * using different BSSID. This will also give the station another
1390 * chance to restart the authentication/authorization in case
1391 * something went wrong the first time.
b291ba11 1392 */
05c914fe 1393 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1394 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1395 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1396 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1397 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
e5a9f8d0 1398 sta->rx_stats.last_rx = jiffies;
f4ebddf9
HR		 1399 if (ieee80211_is_data(hdr->frame_control) &&
1400 !is_multicast_ether_addr(hdr->addr1)) {
e5a9f8d0
JB		 1401 sta->rx_stats.last_rate_idx =
1402 status->rate_idx;
1403 sta->rx_stats.last_rate_flag =
1404 status->flag;
1405 sta->rx_stats.last_rate_vht_flag =
1406 status->vht_flag;
1407 sta->rx_stats.last_rate_vht_nss =
1408 status->vht_nss;
3af6334c
FF		 1409 }
1410 }
239281f8 1411 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
e5a9f8d0 1412 sta->rx_stats.last_rx = jiffies;
b291ba11
JB		 1413 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1414 /*
33b64eb2
LCC		 1415 * Mesh beacons will update last_rx when if they are found to
1416 * match the current local configuration when processed.
571ecf67 1417 */
e5a9f8d0 1418 sta->rx_stats.last_rx = jiffies;
3af6334c 1419 if (ieee80211_is_data(hdr->frame_control)) {
e5a9f8d0
JB		 1420 sta->rx_stats.last_rate_idx = status->rate_idx;
1421 sta->rx_stats.last_rate_flag = status->flag;
1422 sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1423 sta->rx_stats.last_rate_vht_nss = status->vht_nss;
3af6334c 1424 }
571ecf67
JB		 1425 }
1426
3cf335d5
KV		 1427 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1428 ieee80211_sta_rx_notify(rx->sdata, hdr);
1429
e5a9f8d0
JB		 1430 sta->rx_stats.fragments++;
1431 sta->rx_stats.bytes += rx->skb->len;
fe8431f8 1432 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
e5a9f8d0
JB		 1433 sta->rx_stats.last_signal = status->signal;
1434 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
fe8431f8 1435 }
571ecf67 1436
ef0621e8 1437 if (status->chains) {
e5a9f8d0 1438 sta->rx_stats.chains = status->chains;
ef0621e8
FF		 1439 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1440 int signal = status->chain_signal[i];
1441
1442 if (!(status->chains & BIT(i)))
1443 continue;
1444
e5a9f8d0
JB		 1445 sta->rx_stats.chain_signal_last[i] = signal;
1446 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1447 -signal);
ef0621e8
FF		 1448 }
1449 }
1450
72eaa43a
JB		 1451 /*
1452 * Change STA power saving mode only at the end of a frame
1453 * exchange sequence.
1454 */
30686bf7 1455 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
d057e5a3 1456 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1457 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1458 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1459 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1460 /* PM bit is only checked in frames where it isn't reserved,
1461 * in AP mode it's reserved in non-bufferable management frames
1462 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1463 */
1464 (!ieee80211_is_mgmt(hdr->frame_control) ||
1465 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1466 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1467 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1468 sta_ps_end(sta);
72eaa43a
JB		 1469 } else {
1470 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1471 sta_ps_start(sta);
72eaa43a 1472 }
571ecf67
JB		 1473 }
1474
3f52b7e3
MP		 1475 /* mesh power save support */
1476 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1477 ieee80211_mps_rx_h_sta_process(sta, hdr);
1478
22403def
JB		 1479 /*
1480 * Drop (qos-)data::nullfunc frames silently, since they
1481 * are used only to control station power saving mode.
1482 */
1483 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1484 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1485 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1486
1487 /*
1488 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1489 * that was not moved to a 4-addr STA vlan yet send
1490 * the event to userspace and for older hostapd drop
1491 * the frame to the monitor interface.
d524215f
FF		 1492 */
1493 if (ieee80211_has_a4(hdr->frame_control) &&
1494 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1495 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1496 !rx->sdata->u.vlan.sta))) {
1497 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1498 cfg80211_rx_unexpected_4addr_frame(
1499 rx->sdata->dev, sta->sta.addr,
1500 GFP_ATOMIC);
d524215f 1501 return RX_DROP_MONITOR;
e7f4a940 1502 }
22403def
JB		 1503 /*
1504 * Update counter and free packet here to avoid
1505 * counting this as a dropped packed.
1506 */
e5a9f8d0 1507 sta->rx_stats.packets++;
571ecf67 1508 dev_kfree_skb(rx->skb);
9ae54c84 1509 return RX_QUEUED;
571ecf67
JB		 1510 }
1511
9ae54c84 1512 return RX_CONTINUE;
571ecf67
JB		 1513} /* ieee80211_rx_h_sta_process */
1514
86c228a7
JA		 1515static ieee80211_rx_result debug_noinline
1516ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1517{
1518 struct sk_buff *skb = rx->skb;
1519 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1520 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1521 int keyidx;
1522 int hdrlen;
1523 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1524 struct ieee80211_key *sta_ptk = NULL;
1525 int mmie_keyidx = -1;
1526 __le16 fc;
2475b1cc 1527 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1528
1529 /*
1530 * Key selection 101
1531 *
1532 * There are four types of keys:
1533 * - GTK (group keys)
1534 * - IGTK (group keys for management frames)
1535 * - PTK (pairwise keys)
1536 * - STK (station-to-station pairwise keys)
1537 *
1538 * When selecting a key, we have to distinguish between multicast
1539 * (including broadcast) and unicast frames, the latter can only
1540 * use PTKs and STKs while the former always use GTKs and IGTKs.
1541 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1542 * unicast frames can also use key indices like GTKs. Hence, if we
1543 * don't have a PTK/STK we check the key index for a WEP key.
1544 *
1545 * Note that in a regular BSS, multicast frames are sent by the
1546 * AP only, associated stations unicast the frame to the AP first
1547 * which then multicasts it on their behalf.
1548 *
1549 * There is also a slight problem in IBSS mode: GTKs are negotiated
1550 * with each station, that is something we don't currently handle.
1551 * The spec seems to expect that one negotiates the same key with
1552 * every station but there's no such requirement; VLANs could be
1553 * possible.
1554 */
1555
86c228a7
JA		 1556 /* start without a key */
1557 rx->key = NULL;
2475b1cc 1558 fc = hdr->frame_control;
86c228a7 1559
2475b1cc
MS		 1560 if (rx->sta) {
1561 int keyid = rx->sta->ptk_idx;
86c228a7 1562
2475b1cc
MS		 1563 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1564 cs = rx->sta->cipher_scheme;
1565 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1566 if (unlikely(keyid < 0))
1567 return RX_DROP_UNUSABLE;
1568 }
1569 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1570 }
86c228a7
JA		 1571
1572 if (!ieee80211_has_protected(fc))
1573 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1574
1575 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1576 rx->key = sta_ptk;
1577 if ((status->flag & RX_FLAG_DECRYPTED) &&
1578 (status->flag & RX_FLAG_IV_STRIPPED))
1579 return RX_CONTINUE;
1580 /* Skip decryption if the frame is not protected. */
1581 if (!ieee80211_has_protected(fc))
1582 return RX_CONTINUE;
1583 } else if (mmie_keyidx >= 0) {
1584 /* Broadcast/multicast robust management frame / BIP */
1585 if ((status->flag & RX_FLAG_DECRYPTED) &&
1586 (status->flag & RX_FLAG_IV_STRIPPED))
1587 return RX_CONTINUE;
1588
1589 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1590 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1591 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1592 if (rx->sta)
1593 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1594 if (!rx->key)
1595 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1596 } else if (!ieee80211_has_protected(fc)) {
1597 /*
1598 * The frame was not protected, so skip decryption. However, we
1599 * need to set rx->key if there is a key that could have been
1600 * used so that the frame may be dropped if encryption would
1601 * have been expected.
1602 */
1603 struct ieee80211_key *key = NULL;
1604 struct ieee80211_sub_if_data *sdata = rx->sdata;
1605 int i;
1606
1607 if (ieee80211_is_mgmt(fc) &&
1608 is_multicast_ether_addr(hdr->addr1) &&
1609 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1610 rx->key = key;
1611 else {
1612 if (rx->sta) {
1613 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1614 key = rcu_dereference(rx->sta->gtk[i]);
1615 if (key)
1616 break;
1617 }
1618 }
1619 if (!key) {
1620 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1621 key = rcu_dereference(sdata->keys[i]);
1622 if (key)
1623 break;
1624 }
1625 }
1626 if (key)
1627 rx->key = key;
1628 }
1629 return RX_CONTINUE;
1630 } else {
1631 u8 keyid;
2475b1cc 1632
86c228a7
JA		 1633 /*
1634 * The device doesn't give us the IV so we won't be
1635 * able to look up the key. That's ok though, we
1636 * don't need to decrypt the frame, we just won't
1637 * be able to keep statistics accurate.
1638 * Except for key threshold notifications, should
1639 * we somehow allow the driver to tell us which key
1640 * the hardware used if this flag is set?
1641 */
1642 if ((status->flag & RX_FLAG_DECRYPTED) &&
1643 (status->flag & RX_FLAG_IV_STRIPPED))
1644 return RX_CONTINUE;
1645
1646 hdrlen = ieee80211_hdrlen(fc);
1647
2475b1cc
MS		 1648 if (cs) {
1649 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1650
2475b1cc
MS		 1651 if (unlikely(keyidx < 0))
1652 return RX_DROP_UNUSABLE;
1653 } else {
1654 if (rx->skb->len < 8 + hdrlen)
1655 return RX_DROP_UNUSABLE; /* TODO: count this? */
1656 /*
1657 * no need to call ieee80211_wep_get_keyidx,
1658 * it verifies a bunch of things we've done already
1659 */
1660 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1661 keyidx = keyid >> 6;
1662 }
86c228a7
JA		 1663
1664 /* check per-station GTK first, if multicast packet */
1665 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1666 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1667
1668 /* if not found, try default key */
1669 if (!rx->key) {
1670 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1671
1672 /*
1673 * RSNA-protected unicast frames should always be
1674 * sent with pairwise or station-to-station keys,
1675 * but for WEP we allow using a key index as well.
1676 */
1677 if (rx->key &&
1678 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1679 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1680 !is_multicast_ether_addr(hdr->addr1))
1681 rx->key = NULL;
1682 }
1683 }
1684
1685 if (rx->key) {
1686 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1687 return RX_DROP_MONITOR;
1688
86c228a7
JA		 1689 /* TODO: add threshold stuff again */
1690 } else {
1691 return RX_DROP_MONITOR;
1692 }
1693
1694 switch (rx->key->conf.cipher) {
1695 case WLAN_CIPHER_SUITE_WEP40:
1696 case WLAN_CIPHER_SUITE_WEP104:
1697 result = ieee80211_crypto_wep_decrypt(rx);
1698 break;
1699 case WLAN_CIPHER_SUITE_TKIP:
1700 result = ieee80211_crypto_tkip_decrypt(rx);
1701 break;
1702 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1703 result = ieee80211_crypto_ccmp_decrypt(
1704 rx, IEEE80211_CCMP_MIC_LEN);
1705 break;
1706 case WLAN_CIPHER_SUITE_CCMP_256:
1707 result = ieee80211_crypto_ccmp_decrypt(
1708 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1709 break;
1710 case WLAN_CIPHER_SUITE_AES_CMAC:
1711 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1712 break;
56c52da2
JM		 1713 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1714 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1715 break;
8ade538b
JM		 1716 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1717 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1718 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1719 break;
00b9cfa3
JM		 1720 case WLAN_CIPHER_SUITE_GCMP:
1721 case WLAN_CIPHER_SUITE_GCMP_256:
1722 result = ieee80211_crypto_gcmp_decrypt(rx);
1723 break;
86c228a7 1724 default:
2475b1cc 1725 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1726 }
1727
1728 /* the hdr variable is invalid after the decrypt handlers */
1729
1730 /* either the frame has been decrypted or will be dropped */
1731 status->flag |= RX_FLAG_DECRYPTED;
1732
1733 return result;
1734}
1735
571ecf67
JB		 1736static inline struct ieee80211_fragment_entry *
1737ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1738 unsigned int frag, unsigned int seq, int rx_queue,
1739 struct sk_buff **skb)
1740{
1741 struct ieee80211_fragment_entry *entry;
571ecf67 1742
571ecf67
JB		 1743 entry = &sdata->fragments[sdata->fragment_next++];
1744 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1745 sdata->fragment_next = 0;
1746
bdcbd8e0 1747 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1748 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1749
1750 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1751 *skb = NULL;
1752 entry->first_frag_time = jiffies;
1753 entry->seq = seq;
1754 entry->rx_queue = rx_queue;
1755 entry->last_frag = frag;
9acc54be 1756 entry->check_sequential_pn = false;
571ecf67
JB		 1757 entry->extra_len = 0;
1758
1759 return entry;
1760}
1761
1762static inline struct ieee80211_fragment_entry *
1763ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1764 unsigned int frag, unsigned int seq,
571ecf67
JB		 1765 int rx_queue, struct ieee80211_hdr *hdr)
1766{
1767 struct ieee80211_fragment_entry *entry;
1768 int i, idx;
1769
1770 idx = sdata->fragment_next;
1771 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1772 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1773
1774 idx--;
1775 if (idx < 0)
1776 idx = IEEE80211_FRAGMENT_MAX - 1;
1777
1778 entry = &sdata->fragments[idx];
1779 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1780 entry->rx_queue != rx_queue ||
1781 entry->last_frag + 1 != frag)
1782 continue;
1783
b73d70ad 1784 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1785
b73d70ad
HH		 1786 /*
1787 * Check ftype and addresses are equal, else check next fragment
1788 */
1789 if (((hdr->frame_control ^ f_hdr->frame_control) &
1790 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1791 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1792 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1793 continue;
1794
ab46623e 1795 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1796 __skb_queue_purge(&entry->skb_list);
1797 continue;
1798 }
1799 return entry;
1800 }
1801
1802 return NULL;
1803}
1804
49461622 1805static ieee80211_rx_result debug_noinline
5cf121c3 1806ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1807{
1808 struct ieee80211_hdr *hdr;
1809 u16 sc;
358c8d9d 1810 __le16 fc;
571ecf67
JB		 1811 unsigned int frag, seq;
1812 struct ieee80211_fragment_entry *entry;
1813 struct sk_buff *skb;
554891e6 1814 struct ieee80211_rx_status *status;
571ecf67 1815
b73d70ad 1816 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1817 fc = hdr->frame_control;
f7fbf70e
JC		 1818
1819 if (ieee80211_is_ctl(fc))
1820 return RX_CONTINUE;
1821
571ecf67
JB		 1822 sc = le16_to_cpu(hdr->seq_ctrl);
1823 frag = sc & IEEE80211_SCTL_FRAG;
1824
b8fff407 1825 if (is_multicast_ether_addr(hdr->addr1)) {
c206ca67 1826 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
d025933e 1827 goto out_no_led;
571ecf67 1828 }
b8fff407 1829
d025933e
AM		 1830 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1831 goto out;
1832
571ecf67
JB		 1833 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1834
e3cf8b3f
ZY		 1835 if (skb_linearize(rx->skb))
1836 return RX_DROP_UNUSABLE;
1837
058897a4
AK		 1838 /*
1839 * skb_linearize() might change the skb->data and
1840 * previously cached variables (in this case, hdr) need to
1841 * be refreshed with the new data.
1842 */
1843 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1844 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1845
1846 if (frag == 0) {
1847 /* This is the first fragment of a new frame. */
1848 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1849 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 1850 if (rx->key &&
1851 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
9acc54be
JB		 1852 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
1853 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
1854 rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
358c8d9d 1855 ieee80211_has_protected(fc)) {
9e26297a 1856 int queue = rx->security_idx;
9acc54be
JB		 1857
1858 /* Store CCMP/GCMP PN so that we can verify that the
1859 * next fragment has a sequential PN value.
1860 */
1861 entry->check_sequential_pn = true;
571ecf67 1862 memcpy(entry->last_pn,
9190252c 1863 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1864 IEEE80211_CCMP_PN_LEN);
9acc54be
JB		 1865 BUILD_BUG_ON(offsetof(struct ieee80211_key,
1866 u.ccmp.rx_pn) !=
1867 offsetof(struct ieee80211_key,
1868 u.gcmp.rx_pn));
1869 BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
1870 sizeof(rx->key->u.gcmp.rx_pn[queue]));
1871 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
1872 IEEE80211_GCMP_PN_LEN);
571ecf67 1873 }
9ae54c84 1874 return RX_QUEUED;
571ecf67
JB		 1875 }
1876
1877 /* This is a fragment for a frame that should already be pending in
1878 * fragment cache. Add this fragment to the end of the pending entry.
1879 */
9e26297a
JB		 1880 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1881 rx->seqno_idx, hdr);
571ecf67
JB		 1882 if (!entry) {
1883 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1884 return RX_DROP_MONITOR;
571ecf67
JB		 1885 }
1886
9acc54be
JB		 1887 /* "The receiver shall discard MSDUs and MMPDUs whose constituent
1888 * MPDU PN values are not incrementing in steps of 1."
1889 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
1890 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
1891 */
1892 if (entry->check_sequential_pn) {
571ecf67 1893 int i;
4325f6ca 1894 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1895 int queue;
9acc54be 1896
2b2ba0db
JM		 1897 if (!rx->key ||
1898 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
9acc54be
JB		 1899 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
1900 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
1901 rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
e4c26add 1902 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1903 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1904 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1905 pn[i]++;
1906 if (pn[i])
1907 break;
1908 }
9e26297a 1909 queue = rx->security_idx;
9190252c 1910 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1911 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1912 return RX_DROP_UNUSABLE;
4325f6ca 1913 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1914 }
1915
358c8d9d 1916 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1917 __skb_queue_tail(&entry->skb_list, rx->skb);
1918 entry->last_frag = frag;
1919 entry->extra_len += rx->skb->len;
358c8d9d 1920 if (ieee80211_has_morefrags(fc)) {
571ecf67 1921 rx->skb = NULL;
9ae54c84 1922 return RX_QUEUED;
571ecf67
JB		 1923 }
1924
1925 rx->skb = __skb_dequeue(&entry->skb_list);
1926 if (skb_tailroom(rx->skb) < entry->extra_len) {
f1160434 1927 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
571ecf67
JB		 1928 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1929 GFP_ATOMIC))) {
1930 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1931 __skb_queue_purge(&entry->skb_list);
e4c26add 1932 return RX_DROP_UNUSABLE;
571ecf67
JB		 1933 }
1934 }
1935 while ((skb = __skb_dequeue(&entry->skb_list))) {
1936 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1937 dev_kfree_skb(skb);
1938 }
1939
1940 /* Complete frame has been reassembled - process it now */
554891e6 1941 status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 1942
1943 out:
d025933e
AM		 1944 ieee80211_led_rx(rx->local);
1945 out_no_led:
571ecf67 1946 if (rx->sta)
e5a9f8d0 1947 rx->sta->rx_stats.packets++;
9ae54c84 1948 return RX_CONTINUE;
571ecf67
JB		 1949}
1950
1df332e8 1951static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1952{
1df332e8 1953 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1954 return -EACCES;
571ecf67 1955
76ee65bf 1956 return 0;
571ecf67
JB		 1957}
1958
1df332e8 1959static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1960{
eb9fb5b8
JB		 1961 struct sk_buff *skb = rx->skb;
1962 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1963
3017b80b 1964 /*
7848ba7d
JB		 1965 * Pass through unencrypted frames if the hardware has
1966 * decrypted them already.
3017b80b 1967 */
eb9fb5b8 1968 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1969 return 0;
571ecf67
JB		 1970
1971 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1972 if (unlikely(!ieee80211_has_protected(fc) &&
1973 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 1974 ieee80211_is_data(fc) && rx->key))
76ee65bf 1975 return -EACCES;
bef5d1c7
JB		 1976
1977 return 0;
1978}
1979
1df332e8 1980static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1981{
1982 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1983 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1984 __le16 fc = hdr->frame_control;
bef5d1c7 1985
e3efca0a
JM		 1986 /*
1987 * Pass through unencrypted frames if the hardware has
1988 * decrypted them already.
1989 */
1990 if (status->flag & RX_FLAG_DECRYPTED)
1991 return 0;
bef5d1c7 1992
c2c98fde 1993 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1994 if (unlikely(!ieee80211_has_protected(fc) &&
1995 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1996 rx->key)) {
6ff57cf8
JB		 1997 if (ieee80211_is_deauth(fc) ||
1998 ieee80211_is_disassoc(fc))
1999 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2000 rx->skb->data,
2001 rx->skb->len);
f2ca3ea4 2002 return -EACCES;
cf4e594e 2003 }
f2ca3ea4 2004 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 2005 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 2006 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 2007 if (ieee80211_is_deauth(fc) ||
2008 ieee80211_is_disassoc(fc))
2009 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
2010 rx->skb->data,
2011 rx->skb->len);
f2ca3ea4 2012 return -EACCES;
cf4e594e 2013 }
f2ca3ea4
JM		 2014 /*
2015 * When using MFP, Action frames are not allowed prior to
2016 * having configured keys.
2017 */
2018 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 2019 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 2020 return -EACCES;
2021 }
b3fc9c6c 2022
76ee65bf 2023 return 0;
571ecf67
JB		 2024}
2025
76ee65bf 2026static int
4114fa21 2027__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 2028{
eb9fb5b8 2029 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 2030 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 2031 bool check_port_control = false;
2032 struct ethhdr *ehdr;
2033 int ret;
f14543ee 2034
4114fa21 2035 *port_control = false;
9bc383de
JB		 2036 if (ieee80211_has_a4(hdr->frame_control) &&
2037 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 2038 return -1;
9bc383de 2039
fbb327c5
FF		 2040 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2041 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2042
2043 if (!sdata->u.mgd.use_4addr)
2044 return -1;
2045 else
2046 check_port_control = true;
2047 }
2048
9bc383de 2049 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2050 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2051 return -1;
571ecf67 2052
fbb327c5 2053 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2054 if (ret < 0)
fbb327c5
FF		 2055 return ret;
2056
2057 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2058 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2059 *port_control = true;
2060 else if (check_port_control)
fbb327c5
FF		 2061 return -1;
2062
2063 return 0;
76ee65bf 2064}
571ecf67 2065
ce3edf6d
JB		 2066/*
2067 * requires that rx->skb is a frame with ethernet header
2068 */
358c8d9d 2069static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2070{
c97c23e3 2071 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2072 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2073 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2074
2075 /*
2076 * Allow EAPOL frames to us/the PAE group address regardless
2077 * of whether the frame was encrypted or not.
2078 */
a621fa4d 2079 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2080 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2081 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2082 return true;
2083
2084 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2085 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2086 return false;
2087
2088 return true;
2089}
2090
2091/*
2092 * requires that rx->skb is a frame with ethernet header
2093 */
76ee65bf 2094static void
5cf121c3 2095ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2096{
eb9fb5b8
JB		 2097 struct ieee80211_sub_if_data *sdata = rx->sdata;
2098 struct net_device *dev = sdata->dev;
76ee65bf 2099 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2100 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2101 struct sta_info *dsta;
571ecf67 2102
76ee65bf
RR		 2103 skb = rx->skb;
2104 xmit_skb = NULL;
571ecf67 2105
5a490510
JB		 2106 ieee80211_rx_stats(dev, skb->len);
2107
05c914fe
JB		 2108 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2109 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2110 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de 2111 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2112 if (is_multicast_ether_addr(ehdr->h_dest)) {
2113 /*
2114 * send multicast frames both to higher layers in
2115 * local net stack and back to the wireless medium
2116 */
76ee65bf 2117 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2118 if (!xmit_skb)
bdcbd8e0 2119 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2120 dev->name);
571ecf67 2121 } else {
abe60632
JB		 2122 dsta = sta_info_get(sdata, skb->data);
2123 if (dsta) {
ce3edf6d
JB		 2124 /*
2125 * The destination station is associated to
2126 * this AP (in this VLAN), so send the frame
2127 * directly to it and do not pass it to local
2128 * net stack.
571ecf67 2129 */
76ee65bf 2130 xmit_skb = skb;
571ecf67
JB		 2131 skb = NULL;
2132 }
571ecf67
JB		 2133 }
2134 }
2135
59d9cb07 2136#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2137 if (skb) {
2138 /* 'align' will only take the values 0 or 2 here since all
2139 * frames are required to be aligned to 2-byte boundaries
2140 * when being passed to mac80211; the code here works just
2141 * as well if that isn't true, but mac80211 assumes it can
2142 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2143 */
9e890a1f
JB		 2144 int align;
2145
2146 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2147 if (align) {
2148 if (WARN_ON(skb_headroom(skb) < 3)) {
2149 dev_kfree_skb(skb);
2150 skb = NULL;
2151 } else {
2152 u8 *data = skb->data;
8ce0b589
ZY		 2153 size_t len = skb_headlen(skb);
2154 skb->data -= align;
2155 memmove(skb->data, data, len);
2156 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2157 }
2158 }
9e890a1f 2159 }
d1c3a37c
JB		 2160#endif
2161
9e890a1f
JB		 2162 if (skb) {
2163 /* deliver to local stack */
2164 skb->protocol = eth_type_trans(skb, dev);
2165 memset(skb->cb, 0, sizeof(skb->cb));
af9f9b22
JB		 2166 if (rx->napi)
2167 napi_gro_receive(rx->napi, skb);
06d181a8
JB		 2168 else
2169 netif_receive_skb(skb);
571ecf67
JB		 2170 }
2171
76ee65bf 2172 if (xmit_skb) {
aef6c928
HS		 2173 /*
2174 * Send to wireless media and increase priority by 256 to
2175 * keep the received priority instead of reclassifying
2176 * the frame (see cfg80211_classify8021d).
2177 */
2178 xmit_skb->priority += 256;
f831e909 2179 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2180 skb_reset_network_header(xmit_skb);
2181 skb_reset_mac_header(xmit_skb);
76ee65bf 2182 dev_queue_xmit(xmit_skb);
571ecf67 2183 }
76ee65bf
RR		 2184}
2185
49461622 2186static ieee80211_rx_result debug_noinline
5cf121c3 2187ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2188{
eb9fb5b8 2189 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2190 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2191 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2192 __le16 fc = hdr->frame_control;
eaf85ca7 2193 struct sk_buff_head frame_list;
554891e6 2194 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2195
358c8d9d 2196 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2197 return RX_CONTINUE;
fd4c7f2f 2198
358c8d9d 2199 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2200 return RX_DROP_MONITOR;
fd4c7f2f 2201
554891e6 2202 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2203 return RX_CONTINUE;
fd4c7f2f 2204
eaf85ca7
ZY		 2205 if (ieee80211_has_a4(hdr->frame_control) &&
2206 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2207 !rx->sdata->u.vlan.sta)
e4c26add 2208 return RX_DROP_UNUSABLE;
fd4c7f2f 2209
eaf85ca7
ZY		 2210 if (is_multicast_ether_addr(hdr->addr1) &&
2211 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2212 rx->sdata->u.vlan.sta) ||
2213 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2214 rx->sdata->u.mgd.use_4addr)))
e4c26add 2215 return RX_DROP_UNUSABLE;
fd4c7f2f 2216
eaf85ca7
ZY		 2217 skb->dev = dev;
2218 __skb_queue_head_init(&frame_list);
fd4c7f2f 2219
e3cf8b3f
ZY		 2220 if (skb_linearize(skb))
2221 return RX_DROP_UNUSABLE;
2222
eaf85ca7
ZY		 2223 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2224 rx->sdata->vif.type,
8b3becad 2225 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2226
eaf85ca7
ZY		 2227 while (!skb_queue_empty(&frame_list)) {
2228 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2229
358c8d9d 2230 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2231 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2232 continue;
2233 }
fd4c7f2f
RR		 2234
2235 ieee80211_deliver_skb(rx);
2236 }
2237
9ae54c84 2238 return RX_QUEUED;
fd4c7f2f
RR		 2239}
2240
bf94e17b 2241#ifdef CONFIG_MAC80211_MESH
b0dee578 2242static ieee80211_rx_result
e32f85f7
LCC		 2243ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2244{
30789eb6
TP		 2245 struct ieee80211_hdr *fwd_hdr, *hdr;
2246 struct ieee80211_tx_info *info;
e32f85f7 2247 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2248 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2249 struct ieee80211_local *local = rx->local;
eb9fb5b8 2250 struct ieee80211_sub_if_data *sdata = rx->sdata;
30789eb6 2251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2252 u16 q, hdrlen;
e32f85f7
LCC		 2253
2254 hdr = (struct ieee80211_hdr *) skb->data;
2255 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2256
2257 /* make sure fixed part of mesh header is there, also checks skb len */
2258 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2259 return RX_DROP_MONITOR;
2260
2261 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2262
2263 /* make sure full mesh header is there, also checks skb len */
2264 if (!pskb_may_pull(rx->skb,
2265 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2266 return RX_DROP_MONITOR;
2267
2268 /* reload pointers */
2269 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2270 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2271
d0c22119
BC		 2272 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2273 return RX_DROP_MONITOR;
2274
2157fdd6
TP		 2275 /* frame is in RMC, don't forward */
2276 if (ieee80211_is_data(hdr->frame_control) &&
2277 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2278 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2279 return RX_DROP_MONITOR;
2280
5c90067c 2281 if (!ieee80211_is_data(hdr->frame_control))
e32f85f7
LCC		 2282 return RX_CONTINUE;
2283
2284 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2285 return RX_DROP_MONITOR;
2286
43b7b314 2287 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2288 struct mesh_path *mppath;
43b7b314
JC		 2289 char *proxied_addr;
2290 char *mpp_addr;
2291
2292 if (is_multicast_ether_addr(hdr->addr1)) {
2293 mpp_addr = hdr->addr3;
2294 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2295 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2296 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2297 mpp_addr = hdr->addr4;
2298 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2299 } else {
2300 return RX_DROP_MONITOR;
43b7b314 2301 }
79617dee 2302
79617dee 2303 rcu_read_lock();
bf7cd94d 2304 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2305 if (!mppath) {
bf7cd94d 2306 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2307 } else {
2308 spin_lock_bh(&mppath->state_lock);
b203ca39 2309 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2310 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2311 spin_unlock_bh(&mppath->state_lock);
2312 }
2313 rcu_read_unlock();
2314 }
2315
3c5772a5
JC		 2316 /* Frame has reached destination. Don't forward */
2317 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2318 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2319 return RX_CONTINUE;
2320
00e96dec 2321 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2322 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2323 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2324 return RX_DROP_MONITOR;
2325 }
2326 skb_set_queue_mapping(skb, q);
e32f85f7 2327
30789eb6
TP		 2328 if (!--mesh_hdr->ttl) {
2329 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2330 goto out;
30789eb6
TP		 2331 }
2332
d665508b
CYY		 2333 if (!ifmsh->mshcfg.dot11MeshForwarding)
2334 goto out;
2335
30789eb6
TP		 2336 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2337 if (!fwd_skb) {
bdcbd8e0 2338 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2339 sdata->name);
30789eb6
TP		 2340 goto out;
2341 }
2342
2343 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2344 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2345 info = IEEE80211_SKB_CB(fwd_skb);
2346 memset(info, 0, sizeof(*info));
2347 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2348 info->control.vif = &rx->sdata->vif;
2349 info->control.jiffies = jiffies;
2350 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2351 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2352 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2353 /* update power mode indication when forwarding */
2354 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2355 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2356 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2357 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2358 } else {
2359 /* unable to resolve next hop */
bf7cd94d 2360 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2361 fwd_hdr->addr3, 0,
2362 WLAN_REASON_MESH_PATH_NOFORWARD,
2363 fwd_hdr->addr2);
30789eb6 2364 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2365 kfree_skb(fwd_skb);
30789eb6 2366 return RX_DROP_MONITOR;
e32f85f7
LCC		 2367 }
2368
30789eb6
TP		 2369 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2370 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2371 out:
df140465 2372 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2373 return RX_CONTINUE;
df140465 2374 return RX_DROP_MONITOR;
e32f85f7 2375}
bf94e17b 2376#endif
e32f85f7 2377
49461622 2378static ieee80211_rx_result debug_noinline
5cf121c3 2379ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2380{
eb9fb5b8 2381 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2382 struct ieee80211_local *local = rx->local;
eb9fb5b8 2383 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2384 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2385 __le16 fc = hdr->frame_control;
4114fa21 2386 bool port_control;
ce3edf6d 2387 int err;
76ee65bf 2388
358c8d9d 2389 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2390 return RX_CONTINUE;
76ee65bf 2391
358c8d9d 2392 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2393 return RX_DROP_MONITOR;
76ee65bf 2394
79c892b8 2395 if (rx->sta) {
3d6dc343 2396 /* The seqno index has the same property as needed
79c892b8
JB		 2397 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2398 * for non-QoS-data frames. Here we know it's a data
2399 * frame, so count MSDUs.
2400 */
e5a9f8d0 2401 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
79c892b8
JB		 2402 }
2403
f14543ee 2404 /*
e7f4a940
JB		 2405 * Send unexpected-4addr-frame event to hostapd. For older versions,
2406 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2407 */
2408 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2409 sdata->vif.type == NL80211_IFTYPE_AP) {
2410 if (rx->sta &&
2411 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2412 cfg80211_rx_unexpected_4addr_frame(
2413 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2414 return RX_DROP_MONITOR;
e7f4a940 2415 }
f14543ee 2416
4114fa21 2417 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2418 if (unlikely(err))
e4c26add 2419 return RX_DROP_UNUSABLE;
76ee65bf 2420
358c8d9d 2421 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2422 return RX_DROP_MONITOR;
ce3edf6d 2423
8a4d32f3
AN		 2424 /* directly handle TDLS channel switch requests/responses */
2425 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2426 cpu_to_be16(ETH_P_TDLS))) {
2427 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2428
2429 if (pskb_may_pull(rx->skb,
2430 offsetof(struct ieee80211_tdls_data, u)) &&
2431 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2432 tf->category == WLAN_CATEGORY_TDLS &&
2433 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2434 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
c8ff71e6
AN		 2435 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2436 schedule_work(&local->tdls_chsw_work);
8a4d32f3 2437 if (rx->sta)
e5a9f8d0 2438 rx->sta->rx_stats.packets++;
8a4d32f3
AN		 2439
2440 return RX_QUEUED;
2441 }
2442 }
2443
4114fa21
FF		 2444 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2445 unlikely(port_control) && sdata->bss) {
2446 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2447 u.ap);
2448 dev = sdata->dev;
2449 rx->sdata = sdata;
2450 }
2451
76ee65bf
RR		 2452 rx->skb->dev = dev;
2453
08ca944e 2454 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2455 !is_multicast_ether_addr(
2456 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2457 (!local->scanning &&
2458 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2459 mod_timer(&local->dynamic_ps_timer, jiffies +
2460 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2461 }
2462
76ee65bf 2463 ieee80211_deliver_skb(rx);
571ecf67 2464
9ae54c84 2465 return RX_QUEUED;
571ecf67
JB		 2466}
2467
49461622 2468static ieee80211_rx_result debug_noinline
f9e124fb 2469ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2470{
71364716 2471 struct sk_buff *skb = rx->skb;
a7767f95 2472 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2473 struct tid_ampdu_rx *tid_agg_rx;
2474 u16 start_seq_num;
2475 u16 tid;
2476
a7767f95 2477 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2478 return RX_CONTINUE;
71364716 2479
a7767f95 2480 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2481 struct {
2482 __le16 control, start_seq_num;
2483 } __packed bar_data;
6382246e
EG		 2484 struct ieee80211_event event = {
2485 .type = BAR_RX_EVENT,
2486 };
8ae5977f 2487
71364716 2488 if (!rx->sta)
a02ae758 2489 return RX_DROP_MONITOR;
8ae5977f
JB		 2490
2491 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2492 &bar_data, sizeof(bar_data)))
2493 return RX_DROP_MONITOR;
2494
8ae5977f 2495 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2496
2497 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2498 if (!tid_agg_rx)
a02ae758 2499 return RX_DROP_MONITOR;
71364716 2500
8ae5977f 2501 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
6382246e
EG		 2502 event.u.ba.tid = tid;
2503 event.u.ba.ssn = start_seq_num;
2504 event.u.ba.sta = &rx->sta->sta;
71364716
RR		 2505
2506 /* reset session timer */
20ad19d0
JB		 2507 if (tid_agg_rx->timeout)
2508 mod_timer(&tid_agg_rx->session_timer,
2509 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2510
dd318575 2511 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2512 /* release stored frames up to start of BAR */
d3b2fb53 2513 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2514 start_seq_num, frames);
dd318575
JB		 2515 spin_unlock(&tid_agg_rx->reorder_lock);
2516
6382246e
EG		 2517 drv_event_callback(rx->local, rx->sdata, &event);
2518
a02ae758
JB		 2519 kfree_skb(skb);
2520 return RX_QUEUED;
71364716
RR		 2521 }
2522
08daecae
JB		 2523 /*
2524 * After this point, we only want management frames,
2525 * so we can drop all remaining control frames to
2526 * cooked monitor interfaces.
2527 */
2528 return RX_DROP_MONITOR;
71364716
RR		 2529}
2530
f4f727a6
JM		 2531static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2532 struct ieee80211_mgmt *mgmt,
2533 size_t len)
fea14732
JM		 2534{
2535 struct ieee80211_local *local = sdata->local;
2536 struct sk_buff *skb;
2537 struct ieee80211_mgmt *resp;
2538
b203ca39 2539 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2540 /* Not to own unicast address */
2541 return;
2542 }
2543
b203ca39
JP		 2544 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2545 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2546 /* Not from the current AP or not associated yet. */
fea14732
JM		 2547 return;
2548 }
2549
2550 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2551 /* Too short SA Query request frame */
2552 return;
2553 }
2554
2555 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2556 if (skb == NULL)
2557 return;
2558
2559 skb_reserve(skb, local->hw.extra_tx_headroom);
2560 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2561 memset(resp, 0, 24);
2562 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2563 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2564 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2565 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2566 IEEE80211_STYPE_ACTION);
2567 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2568 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2569 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2570 memcpy(resp->u.action.u.sa_query.trans_id,
2571 mgmt->u.action.u.sa_query.trans_id,
2572 WLAN_SA_QUERY_TR_ID_LEN);
2573
62ae67be 2574 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2575}
2576
2e161f78
JB		 2577static ieee80211_rx_result debug_noinline
2578ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2579{
2580 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2581 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2582
2583 /*
2584 * From here on, look only at management frames.
2585 * Data and control frames are already handled,
2586 * and unknown (reserved) frames are useless.
2587 */
2588 if (rx->skb->len < 24)
2589 return RX_DROP_MONITOR;
2590
2591 if (!ieee80211_is_mgmt(mgmt->frame_control))
2592 return RX_DROP_MONITOR;
2593
ee971924
JB		 2594 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2595 ieee80211_is_beacon(mgmt->frame_control) &&
2596 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2597 int sig = 0;
2598
30686bf7 2599 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2600 sig = status->signal;
2601
ee971924
JB		 2602 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2603 rx->skb->data, rx->skb->len,
37c73b5f 2604 status->freq, sig);
ee971924
JB		 2605 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2606 }
2607
2e161f78
JB		 2608 if (ieee80211_drop_unencrypted_mgmt(rx))
2609 return RX_DROP_UNUSABLE;
2610
2611 return RX_CONTINUE;
2612}
2613
de1ede7a
JB		 2614static ieee80211_rx_result debug_noinline
2615ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2616{
2617 struct ieee80211_local *local = rx->local;
eb9fb5b8 2618 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2619 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2620 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2621 int len = rx->skb->len;
2622
2623 if (!ieee80211_is_action(mgmt->frame_control))
2624 return RX_CONTINUE;
2625
026331c4
JM		 2626 /* drop too small frames */
2627 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2628 return RX_DROP_UNUSABLE;
de1ede7a 2629
815b8092 2630 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2631 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2632 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2633 return RX_DROP_UNUSABLE;
de1ede7a 2634
de1ede7a 2635 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2636 case WLAN_CATEGORY_HT:
2637 /* reject HT action frames from stations not supporting HT */
2638 if (!rx->sta->sta.ht_cap.ht_supported)
2639 goto invalid;
2640
2641 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2642 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2643 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2644 sdata->vif.type != NL80211_IFTYPE_AP &&
2645 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2646 break;
2647
ec61cd63 2648 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2649 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2650 goto invalid;
2651
2652 switch (mgmt->u.action.u.ht_smps.action) {
2653 case WLAN_HT_ACTION_SMPS: {
2654 struct ieee80211_supported_band *sband;
af0ed69b 2655 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2656
2657 /* convert to HT capability */
2658 switch (mgmt->u.action.u.ht_smps.smps_control) {
2659 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2660 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2661 break;
2662 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2663 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2664 break;
2665 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2666 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2667 break;
2668 default:
2669 goto invalid;
2670 }
1d8d3dec
JB		 2671
2672 /* if no change do nothing */
af0ed69b 2673 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2674 goto handled;
af0ed69b 2675 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2676
2677 sband = rx->local->hw.wiphy->bands[status->band];
2678
64f68e5d
JB		 2679 rate_control_rate_update(local, sband, rx->sta,
2680 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2681 goto handled;
2682 }
ec61cd63
JB		 2683 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2684 struct ieee80211_supported_band *sband;
2685 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2686 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2687
2688 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2689 if (!(rx->sta->sta.ht_cap.cap &
2690 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2691 goto handled;
2692
e1a0c6b3 2693 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2694 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2695 else
1c45c5ce
EP		 2696 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2697
2698 /* set cur_max_bandwidth and recalc sta bw */
2699 rx->sta->cur_max_bandwidth = max_bw;
2700 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2701
e1a0c6b3 2702 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2703 goto handled;
2704
1c45c5ce 2705 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2706 sband = rx->local->hw.wiphy->bands[status->band];
2707
2708 rate_control_rate_update(local, sband, rx->sta,
2709 IEEE80211_RC_BW_CHANGED);
2710 goto handled;
2711 }
1d8d3dec
JB		 2712 default:
2713 goto invalid;
2714 }
2715
0af83d3d 2716 break;
1b3a2e49
JB		 2717 case WLAN_CATEGORY_PUBLIC:
2718 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2719 goto invalid;
2720 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2721 break;
2722 if (!rx->sta)
2723 break;
2724 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2725 break;
2726 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2727 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2728 break;
2729 if (len < offsetof(struct ieee80211_mgmt,
2730 u.action.u.ext_chan_switch.variable))
2731 goto invalid;
2732 goto queue;
0af83d3d
JB		 2733 case WLAN_CATEGORY_VHT:
2734 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2735 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2736 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2737 sdata->vif.type != NL80211_IFTYPE_AP &&
2738 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2739 break;
2740
2741 /* verify action code is present */
2742 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2743 goto invalid;
2744
2745 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2746 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2747 u8 opmode;
2748
2749 /* verify opmode is present */
2750 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2751 goto invalid;
2752
2753 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2754
2755 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
cf1e05c6 2756 opmode, status->band);
0af83d3d
JB		 2757 goto handled;
2758 }
2759 default:
2760 break;
2761 }
1d8d3dec 2762 break;
de1ede7a 2763 case WLAN_CATEGORY_BACK:
8abd3f9b 2764 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2765 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2766 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2767 sdata->vif.type != NL80211_IFTYPE_AP &&
2768 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2769 break;
8abd3f9b 2770
026331c4
JM		 2771 /* verify action_code is present */
2772 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2773 break;
2774
de1ede7a
JB		 2775 switch (mgmt->u.action.u.addba_req.action_code) {
2776 case WLAN_ACTION_ADDBA_REQ:
2777 if (len < (IEEE80211_MIN_ACTION_SIZE +
2778 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2779 goto invalid;
2780 break;
de1ede7a
JB		 2781 case WLAN_ACTION_ADDBA_RESP:
2782 if (len < (IEEE80211_MIN_ACTION_SIZE +
2783 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2784 goto invalid;
2785 break;
de1ede7a
JB		 2786 case WLAN_ACTION_DELBA:
2787 if (len < (IEEE80211_MIN_ACTION_SIZE +
2788 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2789 goto invalid;
2790 break;
2791 default:
2792 goto invalid;
de1ede7a 2793 }
bed7ee6e 2794
8b58ff83 2795 goto queue;
39192c0b 2796 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2797 /* verify action_code is present */
2798 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2799 break;
2800
39192c0b
JB		 2801 switch (mgmt->u.action.u.measurement.action_code) {
2802 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2803 if (status->band != IEEE80211_BAND_5GHZ)
2804 break;
2805
39192c0b
JB		 2806 if (len < (IEEE80211_MIN_ACTION_SIZE +
2807 sizeof(mgmt->u.action.u.measurement)))
84040805 2808 break;
cd7760e6
SW		 2809
2810 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2811 break;
2812
39192c0b 2813 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2814 goto handled;
cd7760e6
SW		 2815 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2816 u8 *bssid;
2817 if (len < (IEEE80211_MIN_ACTION_SIZE +
2818 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2819 break;
cc32abd4 2820
cd7760e6 2821 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2822 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2823 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2824 break;
2825
2826 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2827 bssid = sdata->u.mgd.bssid;
2828 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2829 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2830 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2831 bssid = mgmt->sa;
cd7760e6
SW		 2832 else
2833 break;
2834
2835 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2836 break;
c481ec97 2837
8b58ff83 2838 goto queue;
cd7760e6 2839 }
39192c0b
JB		 2840 }
2841 break;
fea14732
JM		 2842 case WLAN_CATEGORY_SA_QUERY:
2843 if (len < (IEEE80211_MIN_ACTION_SIZE +
2844 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2845 break;
2846
fea14732
JM		 2847 switch (mgmt->u.action.u.sa_query.action) {
2848 case WLAN_ACTION_SA_QUERY_REQUEST:
2849 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2850 break;
fea14732 2851 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2852 goto handled;
fea14732
JM		 2853 }
2854 break;
8db09850 2855 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2856 if (len < (IEEE80211_MIN_ACTION_SIZE +
2857 sizeof(mgmt->u.action.u.self_prot.action_code)))
2858 break;
2859
8db09850
TP		 2860 switch (mgmt->u.action.u.self_prot.action_code) {
2861 case WLAN_SP_MESH_PEERING_OPEN:
2862 case WLAN_SP_MESH_PEERING_CLOSE:
2863 case WLAN_SP_MESH_PEERING_CONFIRM:
2864 if (!ieee80211_vif_is_mesh(&sdata->vif))
2865 goto invalid;
a6dad6a2 2866 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2867 /* userspace handles this frame */
2868 break;
2869 goto queue;
2870 case WLAN_SP_MGK_INFORM:
2871 case WLAN_SP_MGK_ACK:
2872 if (!ieee80211_vif_is_mesh(&sdata->vif))
2873 goto invalid;
2874 break;
2875 }
2876 break;
d3aaec8a 2877 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2878 if (len < (IEEE80211_MIN_ACTION_SIZE +
2879 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2880 break;
2881
77a121c3
JB		 2882 if (!ieee80211_vif_is_mesh(&sdata->vif))
2883 break;
25d49e4d 2884 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2885 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2886 break;
2887 goto queue;
84040805 2888 }
026331c4 2889
2e161f78
JB		 2890 return RX_CONTINUE;
2891
bed7ee6e 2892 invalid:
554891e6 2893 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2894 /* will return in the next handlers */
2895 return RX_CONTINUE;
2896
2897 handled:
2898 if (rx->sta)
e5a9f8d0 2899 rx->sta->rx_stats.packets++;
2e161f78
JB		 2900 dev_kfree_skb(rx->skb);
2901 return RX_QUEUED;
2902
2903 queue:
2904 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2905 skb_queue_tail(&sdata->skb_queue, rx->skb);
2906 ieee80211_queue_work(&local->hw, &sdata->work);
2907 if (rx->sta)
e5a9f8d0 2908 rx->sta->rx_stats.packets++;
2e161f78
JB		 2909 return RX_QUEUED;
2910}
2911
2912static ieee80211_rx_result debug_noinline
2913ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2914{
554891e6 2915 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2916 int sig = 0;
2e161f78
JB		 2917
2918 /* skip known-bad action frames and return them in the next handler */
554891e6 2919 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2920 return RX_CONTINUE;
d7907448 2921
026331c4
JM		 2922 /*
2923 * Getting here means the kernel doesn't know how to handle
2924 * it, but maybe userspace does ... include returned frames
2925 * so userspace can register for those to know whether ones
2926 * it transmitted were processed or returned.
2927 */
026331c4 2928
30686bf7 2929 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
804483e9
JB		 2930 sig = status->signal;
2931
71bbc994 2932 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2933 rx->skb->data, rx->skb->len, 0)) {
2e161f78 2934 if (rx->sta)
e5a9f8d0 2935 rx->sta->rx_stats.packets++;
2e161f78
JB		 2936 dev_kfree_skb(rx->skb);
2937 return RX_QUEUED;
2938 }
2939
2e161f78
JB		 2940 return RX_CONTINUE;
2941}
2942
2943static ieee80211_rx_result debug_noinline
2944ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2945{
2946 struct ieee80211_local *local = rx->local;
2947 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2948 struct sk_buff *nskb;
2949 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2950 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2951
2952 if (!ieee80211_is_action(mgmt->frame_control))
2953 return RX_CONTINUE;
2954
2955 /*
2956 * For AP mode, hostapd is responsible for handling any action
2957 * frames that we didn't handle, including returning unknown
2958 * ones. For all other modes we will return them to the sender,
2959 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2960 * 802.11-2012 9.24.4.
2e161f78
JB		 2961 * Newer versions of hostapd shall also use the management frame
2962 * registration mechanisms, but older ones still use cooked
2963 * monitor interfaces so push all frames there.
2964 */
554891e6 2965 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2966 (sdata->vif.type == NL80211_IFTYPE_AP ||
2967 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2968 return RX_DROP_MONITOR;
026331c4 2969
4b5ebccc
JB		 2970 if (is_multicast_ether_addr(mgmt->da))
2971 return RX_DROP_MONITOR;
2972
84040805
JB		 2973 /* do not return rejected action frames */
2974 if (mgmt->u.action.category & 0x80)
2975 return RX_DROP_UNUSABLE;
2976
2977 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2978 GFP_ATOMIC);
2979 if (nskb) {
292b4df6 2980 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2981
292b4df6
JL		 2982 nmgmt->u.action.category |= 0x80;
2983 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2984 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2985
2986 memset(nskb->cb, 0, sizeof(nskb->cb));
2987
07e5a5f5
JB		 2988 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2989 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2990
2991 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2992 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2993 IEEE80211_TX_CTL_NO_CCK_RATE;
30686bf7 2994 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
07e5a5f5
JB		 2995 info->hw_queue =
2996 local->hw.offchannel_tx_hw_queue;
2997 }
2998
2999 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
3000 status->band);
de1ede7a 3001 }
39192c0b
JB		 3002 dev_kfree_skb(rx->skb);
3003 return RX_QUEUED;
de1ede7a
JB		 3004}
3005
49461622 3006static ieee80211_rx_result debug_noinline
5cf121c3 3007ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 3008{
eb9fb5b8 3009 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 3010 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
3011 __le16 stype;
571ecf67 3012
77a121c3 3013 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 3014
77a121c3
JB		 3015 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
3016 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 3017 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 3018 sdata->vif.type != NL80211_IFTYPE_STATION)
3019 return RX_DROP_MONITOR;
472dbc45 3020
77a121c3 3021 switch (stype) {
66e67e41 3022 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 3023 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3024 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3025 /* process for all: mesh, mlme, ibss */
3026 break;
66e67e41
JB		 3027 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3028 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 3029 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3030 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 3031 if (is_multicast_ether_addr(mgmt->da) &&
3032 !is_broadcast_ether_addr(mgmt->da))
3033 return RX_DROP_MONITOR;
3034
77a121c3
JB		 3035 /* process only for station */
3036 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3037 return RX_DROP_MONITOR;
3038 break;
3039 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3040 /* process only for ibss and mesh */
3041 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3042 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3043 return RX_DROP_MONITOR;
3044 break;
3045 default:
3046 return RX_DROP_MONITOR;
3047 }
f9d540ee 3048
77a121c3 3049 /* queue up frame and kick off work to process it */
c1475ca9 3050 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3051 skb_queue_tail(&sdata->skb_queue, rx->skb);
3052 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83 3053 if (rx->sta)
e5a9f8d0 3054 rx->sta->rx_stats.packets++;
46900298 3055
77a121c3 3056 return RX_QUEUED;
571ecf67
JB		 3057}
3058
5f0b7de5
JB		 3059static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3060 struct ieee80211_rate *rate)
3d30d949
MW		 3061{
3062 struct ieee80211_sub_if_data *sdata;
3063 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3064 struct sk_buff *skb = rx->skb, *skb2;
3065 struct net_device *prev_dev = NULL;
eb9fb5b8 3066 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3067 int needed_headroom;
3d30d949 3068
554891e6
JB		 3069 /*
3070 * If cooked monitor has been processed already, then
3071 * don't do it again. If not, set the flag.
3072 */
3073 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3074 goto out_free_skb;
554891e6 3075 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3076
152c477a
JB		 3077 /* If there are no cooked monitor interfaces, just free the SKB */
3078 if (!local->cooked_mntrs)
3079 goto out_free_skb;
3080
1f7bba79
JB		 3081 /* vendor data is long removed here */
3082 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3083 /* room for the radiotap header based on driver features */
1f7bba79 3084 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3085
293702a3
JB		 3086 if (skb_headroom(skb) < needed_headroom &&
3087 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3088 goto out_free_skb;
3d30d949 3089
293702a3 3090 /* prepend radiotap information */
973ef21a
FF		 3091 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3092 false);
3d30d949
MW		 3093
3094 skb_set_mac_header(skb, 0);
3095 skb->ip_summed = CHECKSUM_UNNECESSARY;
3096 skb->pkt_type = PACKET_OTHERHOST;
3097 skb->protocol = htons(ETH_P_802_2);
3098
3099 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3100 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3101 continue;
3102
05c914fe 3103 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 3104 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3105 continue;
3106
3107 if (prev_dev) {
3108 skb2 = skb_clone(skb, GFP_ATOMIC);
3109 if (skb2) {
3110 skb2->dev = prev_dev;
5548a8a1 3111 netif_receive_skb(skb2);
3d30d949
MW		 3112 }
3113 }
3114
3115 prev_dev = sdata->dev;
5a490510 3116 ieee80211_rx_stats(sdata->dev, skb->len);
3d30d949
MW		 3117 }
3118
3119 if (prev_dev) {
3120 skb->dev = prev_dev;
5548a8a1 3121 netif_receive_skb(skb);
554891e6
JB		 3122 return;
3123 }
3d30d949
MW		 3124
3125 out_free_skb:
3126 dev_kfree_skb(skb);
3127}
3128
aa0c8636
CL		 3129static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3130 ieee80211_rx_result res)
3131{
3132 switch (res) {
3133 case RX_DROP_MONITOR:
3134 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3135 if (rx->sta)
e5a9f8d0 3136 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3137 /* fall through */
3138 case RX_CONTINUE: {
3139 struct ieee80211_rate *rate = NULL;
3140 struct ieee80211_supported_band *sband;
3141 struct ieee80211_rx_status *status;
3142
3143 status = IEEE80211_SKB_RXCB((rx->skb));
3144
3145 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3146 if (!(status->flag & RX_FLAG_HT) &&
3147 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3148 rate = &sband->bitrates[status->rate_idx];
3149
3150 ieee80211_rx_cooked_monitor(rx, rate);
3151 break;
3152 }
3153 case RX_DROP_UNUSABLE:
3154 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3155 if (rx->sta)
e5a9f8d0 3156 rx->sta->rx_stats.dropped++;
aa0c8636
CL		 3157 dev_kfree_skb(rx->skb);
3158 break;
3159 case RX_QUEUED:
3160 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3161 break;
3162 }
3163}
571ecf67 3164
f9e124fb
CL		 3165static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3166 struct sk_buff_head *frames)
58905290 3167{
58905290 3168 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3169 struct sk_buff *skb;
8944b79f 3170
e32f85f7
LCC		 3171#define CALL_RXH(rxh) \
3172 do { \
3173 res = rxh(rx); \
3174 if (res != RX_CONTINUE) \
2569a826 3175 goto rxh_next; \
e32f85f7 3176 } while (0);
49461622 3177
45ceeee8
JB		 3178 /* Lock here to avoid hitting all of the data used in the RX
3179 * path (e.g. key data, station data, ...) concurrently when
3180 * a frame is released from the reorder buffer due to timeout
3181 * from the timer, potentially concurrently with RX from the
3182 * driver.
3183 */
f9e124fb 3184 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3185
f9e124fb 3186 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3187 /*
3188 * all the other fields are valid across frames
3189 * that belong to an aMPDU since they are on the
3190 * same TID from the same station
3191 */
3192 rx->skb = skb;
3193
2569a826 3194 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 3195 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 3196 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 3197 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 3198 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 3199 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3200 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3201#ifdef CONFIG_MAC80211_MESH
aa0c8636 3202 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3203 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3204#endif
2154c81c 3205 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 3206 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 3207
3208 /* special treatment -- needs the queue */
3209 res = ieee80211_rx_h_ctrl(rx, frames);
3210 if (res != RX_CONTINUE)
3211 goto rxh_next;
3212
2e161f78 3213 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3214 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3215 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3216 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3217 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3218
aa0c8636
CL		 3219 rxh_next:
3220 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3221
49461622 3222#undef CALL_RXH
aa0c8636 3223 }
24a8fdad 3224
f9e124fb 3225 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3226}
3227
4406c376 3228static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3229{
f9e124fb 3230 struct sk_buff_head reorder_release;
aa0c8636
CL		 3231 ieee80211_rx_result res = RX_DROP_MONITOR;
3232
f9e124fb
CL		 3233 __skb_queue_head_init(&reorder_release);
3234
aa0c8636
CL		 3235#define CALL_RXH(rxh) \
3236 do { \
3237 res = rxh(rx); \
3238 if (res != RX_CONTINUE) \
3239 goto rxh_next; \
3240 } while (0);
3241
0395442a 3242 CALL_RXH(ieee80211_rx_h_check_dup)
aa0c8636
CL		 3243 CALL_RXH(ieee80211_rx_h_check)
3244
f9e124fb 3245 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3246
f9e124fb 3247 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3248 return;
49461622 3249
2569a826 3250 rxh_next:
aa0c8636
CL		 3251 ieee80211_rx_handlers_result(rx, res);
3252
3253#undef CALL_RXH
58905290
JB		 3254}
3255
2bff8ebf 3256/*
dd318575
JB		 3257 * This function makes calls into the RX path, therefore
3258 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3259 */
3260void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3261{
f9e124fb 3262 struct sk_buff_head frames;
554891e6
JB		 3263 struct ieee80211_rx_data rx = {
3264 .sta = sta,
3265 .sdata = sta->sdata,
3266 .local = sta->local,
9e26297a
JB		 3267 /* This is OK -- must be QoS data frame */
3268 .security_idx = tid,
3269 .seqno_idx = tid,
af9f9b22 3270 .napi = NULL, /* must be NULL to not have races */
554891e6 3271 };
2c15a0cf
CL		 3272 struct tid_ampdu_rx *tid_agg_rx;
3273
3274 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3275 if (!tid_agg_rx)
3276 return;
2bff8ebf 3277
f9e124fb
CL		 3278 __skb_queue_head_init(&frames);
3279
2c15a0cf 3280 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3281 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3282 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3283
b497de63
EG		 3284 if (!skb_queue_empty(&frames)) {
3285 struct ieee80211_event event = {
3286 .type = BA_FRAME_TIMEOUT,
3287 .u.ba.tid = tid,
3288 .u.ba.sta = &sta->sta,
3289 };
3290 drv_event_callback(rx.local, rx.sdata, &event);
3291 }
3292
f9e124fb 3293 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3294}
3295
571ecf67
JB		 3296/* main receive path */
3297
a58fbe1a 3298static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
23a24def 3299{
20b01f80 3300 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8 3301 struct sk_buff *skb = rx->skb;
a58fbe1a 3302 struct ieee80211_hdr *hdr = (void *)skb->data;
eb9fb5b8
JB		 3303 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3304 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3305 int multicast = is_multicast_ether_addr(hdr->addr1);
3306
51fb61e7 3307 switch (sdata->vif.type) {
05c914fe 3308 case NL80211_IFTYPE_STATION:
9bc383de 3309 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3310 return false;
a58fbe1a
JB		 3311 if (multicast)
3312 return true;
3313 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe 3314 case NL80211_IFTYPE_ADHOC:
23a24def 3315 if (!bssid)
3c2723f5 3316 return false;
6329b8d9
FF		 3317 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3318 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3319 return false;
a58fbe1a 3320 if (ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3321 return true;
a58fbe1a 3322 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
3c2723f5 3323 return false;
a58fbe1a
JB		 3324 if (!multicast &&
3325 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
df140465 3326 return false;
a58fbe1a 3327 if (!rx->sta) {
0fb8ca45 3328 int rate_idx;
5614618e
JB		 3329 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3330 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3331 else
eb9fb5b8 3332 rate_idx = status->rate_idx;
8bf11d8d
JB		 3333 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3334 BIT(rate_idx));
0fb8ca45 3335 }
a58fbe1a 3336 return true;
239281f8
RL		 3337 case NL80211_IFTYPE_OCB:
3338 if (!bssid)
3339 return false;
cc117298 3340 if (!ieee80211_is_data_present(hdr->frame_control))
239281f8 3341 return false;
a58fbe1a 3342 if (!is_broadcast_ether_addr(bssid))
239281f8 3343 return false;
a58fbe1a
JB		 3344 if (!multicast &&
3345 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
df140465 3346 return false;
a58fbe1a 3347 if (!rx->sta) {
239281f8
RL		 3348 int rate_idx;
3349 if (status->flag & RX_FLAG_HT)
3350 rate_idx = 0; /* TODO: HT rates */
3351 else
3352 rate_idx = status->rate_idx;
3353 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3354 BIT(rate_idx));
3355 }
a58fbe1a 3356 return true;
05c914fe 3357 case NL80211_IFTYPE_MESH_POINT:
a58fbe1a
JB		 3358 if (multicast)
3359 return true;
3360 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
05c914fe
JB		 3361 case NL80211_IFTYPE_AP_VLAN:
3362 case NL80211_IFTYPE_AP:
a58fbe1a
JB		 3363 if (!bssid)
3364 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3365
3366 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3367 /*
3368 * Accept public action frames even when the
3369 * BSSID doesn't match, this is used for P2P
3370 * and location updates. Note that mac80211
3371 * itself never looks at these frames.
3372 */
2b9ccd4e
JB		 3373 if (!multicast &&
3374 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3375 return false;
d48b2968 3376 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3377 return true;
5c90067c 3378 return ieee80211_is_beacon(hdr->frame_control);
a58fbe1a
JB		 3379 }
3380
3381 if (!ieee80211_has_tods(hdr->frame_control)) {
db8e1732
AN		 3382 /* ignore data frames to TDLS-peers */
3383 if (ieee80211_is_data(hdr->frame_control))
3384 return false;
3385 /* ignore action frames to TDLS-peers */
3386 if (ieee80211_is_action(hdr->frame_control) &&
1ec7bae8 3387 !is_broadcast_ether_addr(bssid) &&
db8e1732
AN		 3388 !ether_addr_equal(bssid, hdr->addr1))
3389 return false;
23a24def 3390 }
a58fbe1a 3391 return true;
05c914fe 3392 case NL80211_IFTYPE_WDS:
a7767f95 3393 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3394 return false;
a58fbe1a 3395 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
f142c6b9 3396 case NL80211_IFTYPE_P2P_DEVICE:
a58fbe1a
JB		 3397 return ieee80211_is_public_action(hdr, skb->len) ||
3398 ieee80211_is_probe_req(hdr->frame_control) ||
3399 ieee80211_is_probe_resp(hdr->frame_control) ||
3400 ieee80211_is_beacon(hdr->frame_control);
2ca27bcf 3401 default:
fb1c1cd6 3402 break;
23a24def
JB		 3403 }
3404
a58fbe1a
JB		 3405 WARN_ON_ONCE(1);
3406 return false;
23a24def
JB		 3407}
3408
4406c376
JB		 3409/*
3410 * This function returns whether or not the SKB
3411 * was destined for RX processing or not, which,
3412 * if consume is true, is equivalent to whether
3413 * or not the skb was consumed.
3414 */
3415static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3416 struct sk_buff *skb, bool consume)
3417{
3418 struct ieee80211_local *local = rx->local;
3419 struct ieee80211_sub_if_data *sdata = rx->sdata;
4406c376
JB		 3420
3421 rx->skb = skb;
4406c376 3422
a58fbe1a 3423 if (!ieee80211_accept_frame(rx))
4406c376
JB		 3424 return false;
3425
4406c376
JB		 3426 if (!consume) {
3427 skb = skb_copy(skb, GFP_ATOMIC);
3428 if (!skb) {
3429 if (net_ratelimit())
3430 wiphy_debug(local->hw.wiphy,
b305dae4 3431 "failed to copy skb for %s\n",
4406c376
JB		 3432 sdata->name);
3433 return true;
3434 }
3435
3436 rx->skb = skb;
3437 }
3438
3439 ieee80211_invoke_rx_handlers(rx);
3440 return true;
3441}
3442
571ecf67 3443/*
6b59db7d 3444 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3445 * be called with rcu_read_lock protection.
571ecf67 3446 */
71ebb4aa 3447static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
af9f9b22
JB		 3448 struct sk_buff *skb,
3449 struct napi_struct *napi)
571ecf67
JB		 3450{
3451 struct ieee80211_local *local = hw_to_local(hw);
3452 struct ieee80211_sub_if_data *sdata;
571ecf67 3453 struct ieee80211_hdr *hdr;
e3cf8b3f 3454 __le16 fc;
5cf121c3 3455 struct ieee80211_rx_data rx;
4406c376 3456 struct ieee80211_sub_if_data *prev;
7bedd0cf
JB		 3457 struct sta_info *sta, *prev_sta;
3458 struct rhash_head *tmp;
e3cf8b3f 3459 int err = 0;
571ecf67 3460
e3cf8b3f 3461 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3462 memset(&rx, 0, sizeof(rx));
3463 rx.skb = skb;
3464 rx.local = local;
af9f9b22 3465 rx.napi = napi;
72abd81b 3466
e3cf8b3f 3467 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
c206ca67 3468 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
571ecf67 3469
4a4f1a58
JB		 3470 if (ieee80211_is_mgmt(fc)) {
3471 /* drop frame if too short for header */
3472 if (skb->len < ieee80211_hdrlen(fc))
3473 err = -ENOBUFS;
3474 else
3475 err = skb_linearize(skb);
3476 } else {
e3cf8b3f 3477 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3478 }
e3cf8b3f
ZY		 3479
3480 if (err) {
3481 dev_kfree_skb(skb);
3482 return;
3483 }
3484
3485 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3486 ieee80211_parse_qos(&rx);
d1c3a37c 3487 ieee80211_verify_alignment(&rx);
38f3714d 3488
d48b2968
JB		 3489 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3490 ieee80211_is_beacon(hdr->frame_control)))
3491 ieee80211_scan_rx(local, skb);
3492
e3cf8b3f 3493 if (ieee80211_is_data(fc)) {
7bedd0cf
JB		 3494 const struct bucket_table *tbl;
3495
56af3268 3496 prev_sta = NULL;
4406c376 3497
7bedd0cf
JB		 3498 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3499
3500 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
56af3268
BG		 3501 if (!prev_sta) {
3502 prev_sta = sta;
3503 continue;
3504 }
3505
3506 rx.sta = prev_sta;
3507 rx.sdata = prev_sta->sdata;
4406c376 3508 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3509
56af3268 3510 prev_sta = sta;
4406c376 3511 }
56af3268
BG		 3512
3513 if (prev_sta) {
3514 rx.sta = prev_sta;
3515 rx.sdata = prev_sta->sdata;
3516
4406c376 3517 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3518 return;
8e26d5ad 3519 goto out;
56af3268 3520 }
4406c376
JB		 3521 }
3522
4b0dd98e 3523 prev = NULL;
b2e7771e 3524
4b0dd98e
JB		 3525 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3526 if (!ieee80211_sdata_running(sdata))
3527 continue;
340e11f3 3528
4b0dd98e
JB		 3529 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3530 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3531 continue;
340e11f3 3532
4b0dd98e
JB		 3533 /*
3534 * frame is destined for this interface, but if it's
3535 * not also for the previous one we handle that after
3536 * the loop to avoid copying the SKB once too much
3537 */
4bb29f8c 3538
4b0dd98e 3539 if (!prev) {
abe60632 3540 prev = sdata;
4b0dd98e 3541 continue;
340e11f3 3542 }
4bb29f8c 3543
7852e361 3544 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3545 rx.sdata = prev;
3546 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3547
4b0dd98e
JB		 3548 prev = sdata;
3549 }
3550
3551 if (prev) {
7852e361 3552 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3553 rx.sdata = prev;
4406c376 3554
4b0dd98e
JB		 3555 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3556 return;
571ecf67 3557 }
4406c376 3558
8e26d5ad 3559 out:
4406c376 3560 dev_kfree_skb(skb);
571ecf67 3561}
6368e4b1
RR		 3562
3563/*
3564 * This is the receive path handler. It is called by a low level driver when an
3565 * 802.11 MPDU is received from the hardware.
3566 */
af9f9b22
JB		 3567void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3568 struct napi_struct *napi)
6368e4b1
RR		 3569{
3570 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3571 struct ieee80211_rate *rate = NULL;
3572 struct ieee80211_supported_band *sband;
f1d58c25 3573 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3574
d20ef63d
JB		 3575 WARN_ON_ONCE(softirq_count() == 0);
3576
444e3803 3577 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3578 goto drop;
8318d78a
JB		 3579
3580 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3581 if (WARN_ON(!sband))
3582 goto drop;
8318d78a 3583
89c3a8ac
JB		 3584 /*
3585 * If we're suspending, it is possible although not too likely
3586 * that we'd be receiving frames after having already partially
3587 * quiesced the stack. We can't process such frames then since
3588 * that might, for example, cause stations to be added or other
3589 * driver callbacks be invoked.
3590 */
77a980dc
JB		 3591 if (unlikely(local->quiescing || local->suspended))
3592 goto drop;
89c3a8ac 3593
04800ada
AN		 3594 /* We might be during a HW reconfig, prevent Rx for the same reason */
3595 if (unlikely(local->in_reconfig))
3596 goto drop;
3597
ea77f12f
JB		 3598 /*
3599 * The same happens when we're not even started,
3600 * but that's worth a warning.
3601 */
77a980dc
JB		 3602 if (WARN_ON(!local->started))
3603 goto drop;
ea77f12f 3604
fc885189 3605 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3606 /*
fc885189
JB		 3607 * Validate the rate, unless a PLCP error means that
3608 * we probably can't have a valid rate here anyway.
e5d6eb83 3609 */
fc885189
JB		 3610
3611 if (status->flag & RX_FLAG_HT) {
3612 /*
3613 * rate_idx is MCS index, which can be [0-76]
3614 * as documented on:
3615 *
3616 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3617 *
3618 * Anything else would be some sort of driver or
3619 * hardware error. The driver should catch hardware
3620 * errors.
3621 */
444e3803 3622 if (WARN(status->rate_idx > 76,
fc885189
JB		 3623 "Rate marked as an HT rate but passed "
3624 "status->rate_idx is not "
3625 "an MCS index [0-76]: %d (0x%02x)\n",
3626 status->rate_idx,
3627 status->rate_idx))
3628 goto drop;
5614618e
JB		 3629 } else if (status->flag & RX_FLAG_VHT) {
3630 if (WARN_ONCE(status->rate_idx > 9 ||
3631 !status->vht_nss ||
3632 status->vht_nss > 8,
3633 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3634 status->rate_idx, status->vht_nss))
3635 goto drop;
fc885189 3636 } else {
444e3803 3637 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3638 goto drop;
3639 rate = &sband->bitrates[status->rate_idx];
3640 }
0fb8ca45 3641 }
6368e4b1 3642
554891e6
JB		 3643 status->rx_flags = 0;
3644
6368e4b1
RR		 3645 /*
3646 * key references and virtual interfaces are protected using RCU
3647 * and this requires that we are in a read-side RCU section during
3648 * receive processing
3649 */
3650 rcu_read_lock();
3651
3652 /*
3653 * Frames with failed FCS/PLCP checksum are not returned,
3654 * all other frames are returned without radiotap header
3655 * if it was previously present.
3656 * Also, frames with less than 16 bytes are dropped.
3657 */
f1d58c25 3658 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3659 if (!skb) {
3660 rcu_read_unlock();
3661 return;
3662 }
3663
e1e54068
JB		 3664 ieee80211_tpt_led_trig_rx(local,
3665 ((struct ieee80211_hdr *)skb->data)->frame_control,
3666 skb->len);
af9f9b22 3667 __ieee80211_rx_handle_packet(hw, skb, napi);
6368e4b1
RR		 3668
3669 rcu_read_unlock();
77a980dc
JB		 3670
3671 return;
3672 drop:
3673 kfree_skb(skb);
6368e4b1 3674}
af9f9b22 3675EXPORT_SYMBOL(ieee80211_rx_napi);
571ecf67
JB		 3676
3677/* This is a version of the rx handler that can be called from hard irq
3678 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3679void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3680{
3681 struct ieee80211_local *local = hw_to_local(hw);
3682
3683 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3684
571ecf67
JB		 3685 skb->pkt_type = IEEE80211_RX_MSG;
3686 skb_queue_tail(&local->skb_queue, skb);
3687 tasklet_schedule(&local->tasklet);
3688}
3689EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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