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mac80211: avoid using uninitialized stack data
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
571ecf67
JB		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
ab46623e 13#include <linux/jiffies.h>
5a0e3ad6 14#include <linux/slab.h>
571ecf67
JB		 15#include <linux/kernel.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
d4e46a3d 19#include <linux/rcupdate.h>
bc3b2d7f 20#include <linux/export.h>
571ecf67
JB		 21#include <net/mac80211.h>
22#include <net/ieee80211_radiotap.h>
d26ad377 23#include <asm/unaligned.h>
571ecf67
JB		 24
25#include "ieee80211_i.h"
24487981 26#include "driver-ops.h"
2c8dccc7 27#include "led.h"
33b64eb2 28#include "mesh.h"
571ecf67
JB		 29#include "wep.h"
30#include "wpa.h"
31#include "tkip.h"
32#include "wme.h"
1d8d3dec 33#include "rate.h"
571ecf67 34
b2e7771e
JB		 35/*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
1f7bba79
JB		 42 struct sk_buff *skb,
43 unsigned int rtap_vendor_space)
b2e7771e 44{
b2e7771e
JB		 45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
e3cf8b3f 47 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
0624760c 52 return NULL;
b2e7771e
JB		 53 }
54 }
55
1f7bba79
JB		 56 __pskb_pull(skb, rtap_vendor_space);
57
b2e7771e
JB		 58 return skb;
59}
60
1f7bba79
JB		 61static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
62 unsigned int rtap_vendor_space)
b2e7771e 63{
f1d58c25 64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 65 struct ieee80211_hdr *hdr;
66
67 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 68
4c298677
JB		 69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
6b59db7d
ZG		 72 return true;
73
1f7bba79 74 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 75 return true;
76
87228f57
HH		 77 if (ieee80211_is_ctl(hdr->frame_control) &&
78 !ieee80211_is_pspoll(hdr->frame_control) &&
79 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 80 return true;
81
82 return false;
b2e7771e
JB		 83}
84
601ae7f2 85static int
1f7bba79
JB		 86ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
87 struct ieee80211_rx_status *status,
88 struct sk_buff *skb)
601ae7f2
BR		 89{
90 int len;
91
92 /* always present fields */
a144f378 93 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 94
a144f378 95 /* allocate extra bitmaps */
a144f378
JB		 96 if (status->chains)
97 len += 4 * hweight8(status->chains);
90b9e446
JB		 98
99 if (ieee80211_have_rx_timestamp(status)) {
100 len = ALIGN(len, 8);
601ae7f2 101 len += 8;
90b9e446 102 }
7fee5372 103 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 104 len += 1;
601ae7f2 105
a144f378
JB		 106 /* antenna field, if we don't have per-chain info */
107 if (!status->chains)
108 len += 1;
109
90b9e446
JB		 110 /* padding for RX_FLAGS if necessary */
111 len = ALIGN(len, 2);
601ae7f2 112
6d744bac
JB		 113 if (status->flag & RX_FLAG_HT) /* HT info */
114 len += 3;
115
4c298677 116 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 117 len = ALIGN(len, 4);
4c298677
JB		 118 len += 8;
119 }
120
51648921
JB		 121 if (status->flag & RX_FLAG_VHT) {
122 len = ALIGN(len, 2);
123 len += 12;
124 }
125
a144f378
JB		 126 if (status->chains) {
127 /* antenna and antenna signal fields */
128 len += 2 * hweight8(status->chains);
129 }
130
1f7bba79
JB		 131 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
132 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
133
134 /* vendor presence bitmap */
135 len += 4;
136 /* alignment for fixed 6-byte vendor data header */
137 len = ALIGN(len, 2);
138 /* vendor data header */
139 len += 6;
140 if (WARN_ON(rtap->align == 0))
141 rtap->align = 1;
142 len = ALIGN(len, rtap->align);
143 len += rtap->len + rtap->pad;
144 }
145
601ae7f2
BR		 146 return len;
147}
148
00ea6deb 149/*
601ae7f2
BR		 150 * ieee80211_add_rx_radiotap_header - add radiotap header
151 *
152 * add a radiotap header containing all the fields which the hardware provided.
153 */
154static void
155ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
156 struct sk_buff *skb,
601ae7f2 157 struct ieee80211_rate *rate,
973ef21a 158 int rtap_len, bool has_fcs)
601ae7f2 159{
f1d58c25 160 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 161 struct ieee80211_radiotap_header *rthdr;
162 unsigned char *pos;
a144f378
JB		 163 __le32 *it_present;
164 u32 it_present_val;
6a86b9c7 165 u16 rx_flags = 0;
a5e70697 166 u16 channel_flags = 0;
a144f378
JB		 167 int mpdulen, chain;
168 unsigned long chains = status->chains;
1f7bba79
JB		 169 struct ieee80211_vendor_radiotap rtap = {};
170
171 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
172 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
173 /* rtap.len and rtap.pad are undone immediately */
174 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
175 }
f4bda337
TP		 176
177 mpdulen = skb->len;
178 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
179 mpdulen += FCS_LEN;
601ae7f2
BR		 180
181 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 182 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 183 it_present = &rthdr->it_present;
601ae7f2
BR		 184
185 /* radiotap header, set always present flags */
0059b2b1 186 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 187 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
188 BIT(IEEE80211_RADIOTAP_CHANNEL) |
189 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
190
191 if (!status->chains)
192 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
193
194 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
195 it_present_val |=
196 BIT(IEEE80211_RADIOTAP_EXT) |
197 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
198 put_unaligned_le32(it_present_val, it_present);
199 it_present++;
200 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
201 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
202 }
601ae7f2 203
1f7bba79
JB		 204 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
205 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
206 BIT(IEEE80211_RADIOTAP_EXT);
207 put_unaligned_le32(it_present_val, it_present);
208 it_present++;
209 it_present_val = rtap.present;
210 }
211
a144f378
JB		 212 put_unaligned_le32(it_present_val, it_present);
213
214 pos = (void *)(it_present + 1);
215
601ae7f2
BR		 216 /* the order of the following fields is important */
217
218 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 219 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 220 /* padding */
221 while ((pos - (u8 *)rthdr) & 7)
222 *pos++ = 0;
f4bda337
TP		 223 put_unaligned_le64(
224 ieee80211_calculate_rx_timestamp(local, status,
225 mpdulen, 0),
226 pos);
1df332e8 227 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 228 pos += 8;
229 }
230
231 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 232 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 233 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 234 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
235 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 236 if (status->flag & RX_FLAG_SHORTPRE)
237 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 238 pos++;
239
240 /* IEEE80211_RADIOTAP_RATE */
5614618e 241 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 242 /*
f8d1ccf1 243 * Without rate information don't add it. If we have,
38f37be2 244 * MCS information is a separate field in radiotap,
73b48099
JB		 245 * added below. The byte here is needed as padding
246 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 247 */
248 *pos = 0;
8d6f658e 249 } else {
2103dec1 250 int shift = 0;
ebe6c7ba 251 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 252 if (status->flag & RX_FLAG_10MHZ)
253 shift = 1;
254 else if (status->flag & RX_FLAG_5MHZ)
255 shift = 2;
256 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 257 }
601ae7f2
BR		 258 pos++;
259
260 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 261 put_unaligned_le16(status->freq, pos);
601ae7f2 262 pos += 2;
a5e70697
SW		 263 if (status->flag & RX_FLAG_10MHZ)
264 channel_flags |= IEEE80211_CHAN_HALF;
265 else if (status->flag & RX_FLAG_5MHZ)
266 channel_flags |= IEEE80211_CHAN_QUARTER;
267
601ae7f2 268 if (status->band == IEEE80211_BAND_5GHZ)
a5e70697 269 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 270 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 271 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 272 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 273 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 274 else if (rate)
a5e70697 275 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 276 else
a5e70697
SW		 277 channel_flags |= IEEE80211_CHAN_2GHZ;
278 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 279 pos += 2;
280
281 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 282 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
283 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 284 *pos = status->signal;
285 rthdr->it_present |=
286 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
287 pos++;
288 }
289
601ae7f2
BR		 290 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
291
a144f378
JB		 292 if (!status->chains) {
293 /* IEEE80211_RADIOTAP_ANTENNA */
294 *pos = status->antenna;
295 pos++;
296 }
601ae7f2 297
601ae7f2
BR		 298 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
299
300 /* IEEE80211_RADIOTAP_RX_FLAGS */
301 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 302 if ((pos - (u8 *)rthdr) & 1)
90b9e446 303 *pos++ = 0;
aae89831 304 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 305 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
306 put_unaligned_le16(rx_flags, pos);
601ae7f2 307 pos += 2;
6d744bac
JB		 308
309 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 310 unsigned int stbc;
311
6d744bac 312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 313 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 314 *pos = 0;
315 if (status->flag & RX_FLAG_SHORT_GI)
316 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
317 if (status->flag & RX_FLAG_40MHZ)
318 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 319 if (status->flag & RX_FLAG_HT_GF)
320 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
63c361f5
EG		 321 if (status->flag & RX_FLAG_LDPC)
322 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
786677d1
OR		 323 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
324 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 325 pos++;
326 *pos++ = status->rate_idx;
327 }
4c298677
JB		 328
329 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
330 u16 flags = 0;
331
332 /* ensure 4 byte alignment */
333 while ((pos - (u8 *)rthdr) & 3)
334 pos++;
335 rthdr->it_present |=
336 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
337 put_unaligned_le32(status->ampdu_reference, pos);
338 pos += 4;
339 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
340 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
341 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
342 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
343 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
344 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
345 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
346 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
347 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
348 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
349 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
350 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
351 put_unaligned_le16(flags, pos);
352 pos += 2;
353 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
354 *pos++ = status->ampdu_delimiter_crc;
355 else
356 *pos++ = 0;
357 *pos++ = 0;
358 }
90b9e446 359
51648921
JB		 360 if (status->flag & RX_FLAG_VHT) {
361 u16 known = local->hw.radiotap_vht_details;
362
363 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
364 /* known field - how to handle 80+80? */
1b8d242a 365 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
51648921
JB		 366 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
367 put_unaligned_le16(known, pos);
368 pos += 2;
369 /* flags */
370 if (status->flag & RX_FLAG_SHORT_GI)
371 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 372 /* in VHT, STBC is binary */
373 if (status->flag & RX_FLAG_STBC_MASK)
374 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 375 if (status->vht_flag & RX_VHT_FLAG_BF)
376 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 377 pos++;
378 /* bandwidth */
1b8d242a 379 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 380 *pos++ = 4;
1b8d242a 381 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
51648921 382 *pos++ = 0; /* marked not known above */
1b8d242a 383 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 384 *pos++ = 11;
385 else if (status->flag & RX_FLAG_40MHZ)
386 *pos++ = 1;
387 else /* 20 MHz */
388 *pos++ = 0;
389 /* MCS/NSS */
390 *pos = (status->rate_idx << 4) | status->vht_nss;
391 pos += 4;
392 /* coding field */
63c361f5
EG		 393 if (status->flag & RX_FLAG_LDPC)
394 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 395 pos++;
396 /* group ID */
397 pos++;
398 /* partial_aid */
399 pos += 2;
400 }
401
a144f378
JB		 402 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
403 *pos++ = status->chain_signal[chain];
404 *pos++ = chain;
405 }
1f7bba79
JB		 406
407 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
408 /* ensure 2 byte alignment for the vendor field as required */
409 if ((pos - (u8 *)rthdr) & 1)
410 *pos++ = 0;
411 *pos++ = rtap.oui[0];
412 *pos++ = rtap.oui[1];
413 *pos++ = rtap.oui[2];
414 *pos++ = rtap.subns;
415 put_unaligned_le16(rtap.len, pos);
416 pos += 2;
417 /* align the actual payload as requested */
418 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
419 *pos++ = 0;
420 /* data (and possible padding) already follows */
421 }
601ae7f2
BR		 422}
423
b2e7771e
JB		 424/*
425 * This function copies a received frame to all monitor interfaces and
426 * returns a cleaned-up SKB that no longer includes the FCS nor the
427 * radiotap header the driver might have added.
428 */
429static struct sk_buff *
430ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 431 struct ieee80211_rate *rate)
b2e7771e 432{
f1d58c25 433 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 434 struct ieee80211_sub_if_data *sdata;
1f7bba79 435 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 436 struct sk_buff *skb, *skb2;
437 struct net_device *prev_dev = NULL;
438 int present_fcs_len = 0;
1f7bba79
JB		 439 unsigned int rtap_vendor_space = 0;
440
441 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
442 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
443
444 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
445 }
b2e7771e
JB		 446
447 /*
448 * First, we may need to make a copy of the skb because
449 * (1) we need to modify it for radiotap (if not present), and
450 * (2) the other RX handlers will modify the skb we got.
451 *
452 * We don't need to, of course, if we aren't going to return
453 * the SKB because it has a bad FCS/PLCP checksum.
454 */
0869aea0 455
b2e7771e
JB		 456 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
457 present_fcs_len = FCS_LEN;
458
1f7bba79
JB		 459 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
460 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 461 dev_kfree_skb(origskb);
462 return NULL;
463 }
464
b2e7771e 465 if (!local->monitors) {
1f7bba79
JB		 466 if (should_drop_frame(origskb, present_fcs_len,
467 rtap_vendor_space)) {
b2e7771e
JB		 468 dev_kfree_skb(origskb);
469 return NULL;
470 }
471
1f7bba79 472 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 473 }
474
751413ea 475 /* room for the radiotap header based on driver features */
1f7bba79
JB		 476 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
477 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 478
1f7bba79 479 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 480 /* only need to expand headroom if necessary */
481 skb = origskb;
482 origskb = NULL;
483
484 /*
485 * This shouldn't trigger often because most devices have an
486 * RX header they pull before we get here, and that should
487 * be big enough for our radiotap information. We should
488 * probably export the length to drivers so that we can have
489 * them allocate enough headroom to start with.
490 */
491 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 492 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 493 dev_kfree_skb(skb);
494 return NULL;
495 }
496 } else {
497 /*
498 * Need to make a copy and possibly remove radiotap header
499 * and FCS from the original.
500 */
501 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
502
1f7bba79
JB		 503 origskb = remove_monitor_info(local, origskb,
504 rtap_vendor_space);
b2e7771e
JB		 505
506 if (!skb)
507 return origskb;
508 }
509
0869aea0 510 /* prepend radiotap information */
1f7bba79 511 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 512
ce3edf6d 513 skb_reset_mac_header(skb);
b2e7771e
JB		 514 skb->ip_summed = CHECKSUM_UNNECESSARY;
515 skb->pkt_type = PACKET_OTHERHOST;
516 skb->protocol = htons(ETH_P_802_2);
517
518 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 519 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 520 continue;
521
3d30d949
MW		 522 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
523 continue;
524
9607e6b6 525 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 526 continue;
527
b2e7771e
JB		 528 if (prev_dev) {
529 skb2 = skb_clone(skb, GFP_ATOMIC);
530 if (skb2) {
531 skb2->dev = prev_dev;
5548a8a1 532 netif_receive_skb(skb2);
b2e7771e
JB		 533 }
534 }
535
536 prev_dev = sdata->dev;
537 sdata->dev->stats.rx_packets++;
538 sdata->dev->stats.rx_bytes += skb->len;
539 }
540
541 if (prev_dev) {
542 skb->dev = prev_dev;
5548a8a1 543 netif_receive_skb(skb);
b2e7771e
JB		 544 } else
545 dev_kfree_skb(skb);
546
547 return origskb;
548}
549
5cf121c3 550static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 551{
238f74a2 552 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 553 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 554 int tid, seqno_idx, security_idx;
6e0d114d
JB		 555
556 /* does the frame have a qos control field? */
238f74a2
HH		 557 if (ieee80211_is_data_qos(hdr->frame_control)) {
558 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 559 /* frame has qos control */
238f74a2 560 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 561 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 562 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 563
564 seqno_idx = tid;
565 security_idx = tid;
6e0d114d 566 } else {
1411f9b5
JB		 567 /*
568 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
569 *
570 * Sequence numbers for management frames, QoS data
571 * frames with a broadcast/multicast address in the
572 * Address 1 field, and all non-QoS data frames sent
573 * by QoS STAs are assigned using an additional single
574 * modulo-4096 counter, [...]
575 *
576 * We also use that counter for non-QoS STAs.
577 */
5a306f58 578 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 579 security_idx = 0;
580 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 581 security_idx = IEEE80211_NUM_TIDS;
9e26297a 582 tid = 0;
6e0d114d 583 }
52865dfd 584
9e26297a
JB		 585 rx->seqno_idx = seqno_idx;
586 rx->security_idx = security_idx;
6e0d114d
JB		 587 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
588 * For now, set skb->priority to 0 for other cases. */
589 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 590}
6e0d114d 591
d1c3a37c
JB		 592/**
593 * DOC: Packet alignment
594 *
595 * Drivers always need to pass packets that are aligned to two-byte boundaries
596 * to the stack.
597 *
598 * Additionally, should, if possible, align the payload data in a way that
599 * guarantees that the contained IP header is aligned to a four-byte
600 * boundary. In the case of regular frames, this simply means aligning the
601 * payload to a four-byte boundary (because either the IP header is directly
602 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 603 * in front of it). If the payload data is not properly aligned and the
604 * architecture doesn't support efficient unaligned operations, mac80211
605 * will align the data.
d1c3a37c
JB		 606 *
607 * With A-MSDU frames, however, the payload data address must yield two modulo
608 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
609 * push the IP header further back to a multiple of four again. Thankfully, the
610 * specs were sane enough this time around to require padding each A-MSDU
611 * subframe to a length that is a multiple of four.
612 *
25985edc 613 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 614 * the payload is not supported, the driver is required to move the 802.11
615 * header to be directly in front of the payload in that case.
616 */
617static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 618{
59d9cb07
KV		 619#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
620 WARN_ONCE((unsigned long)rx->skb->data & 1,
621 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 622#endif
6e0d114d
JB		 623}
624
6368e4b1 625
571ecf67
JB		 626/* rx handlers */
627
3cfcf6ac
JM		 628static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
629{
630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
631
d8ca16db 632 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 633 return 0;
634
d8ca16db 635 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 636}
637
638
639static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
640{
641 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
642
d8ca16db 643 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 644 return 0;
645
d8ca16db 646 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 647}
648
649
650/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
651static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
652{
653 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
654 struct ieee80211_mmie *mmie;
655
1df332e8 656 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 657 return -1;
658
d8ca16db 659 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 660 return -1; /* not a robust management frame */
661
662 mmie = (struct ieee80211_mmie *)
663 (skb->data + skb->len - sizeof(*mmie));
664 if (mmie->element_id != WLAN_EID_MMIE ||
665 mmie->length != sizeof(*mmie) - 2)
666 return -1;
667
668 return le16_to_cpu(mmie->key_id);
669}
670
2475b1cc
MS		 671static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
672 struct sk_buff *skb)
673{
674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
675 __le16 fc;
676 int hdrlen;
677 u8 keyid;
678
679 fc = hdr->frame_control;
680 hdrlen = ieee80211_hdrlen(fc);
681
682 if (skb->len < hdrlen + cs->hdr_len)
683 return -EINVAL;
684
685 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
686 keyid &= cs->key_idx_mask;
687 keyid >>= cs->key_idx_shift;
688
689 return keyid;
690}
691
1df332e8 692static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 693{
a7767f95 694 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 695 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 696
a7767f95 697 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 698 if (is_multicast_ether_addr(hdr->addr1)) {
699 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 700 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 701 return RX_DROP_MONITOR;
b203ca39 702 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 703 return RX_DROP_MONITOR;
704 } else {
705 if (!ieee80211_has_a4(hdr->frame_control))
706 return RX_DROP_MONITOR;
b203ca39 707 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 708 return RX_DROP_MONITOR;
709 }
33b64eb2
LCC		 710 }
711
712 /* If there is not an established peer link and this is not a peer link
713 * establisment frame, beacon or probe, drop the frame.
714 */
715
57cf8043 716 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 717 struct ieee80211_mgmt *mgmt;
d6d1a5a7 718
a7767f95 719 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 720 return RX_DROP_MONITOR;
721
a7767f95 722 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 723 u8 category;
9b395bc3
JB		 724
725 /* make sure category field is present */
726 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
727 return RX_DROP_MONITOR;
728
33b64eb2 729 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 730 category = mgmt->u.action.category;
731 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 732 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 733 return RX_DROP_MONITOR;
33b64eb2 734 return RX_CONTINUE;
33b64eb2
LCC		 735 }
736
a7767f95
HH		 737 if (ieee80211_is_probe_req(hdr->frame_control) ||
738 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 739 ieee80211_is_beacon(hdr->frame_control) ||
740 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 741 return RX_CONTINUE;
742
743 return RX_DROP_MONITOR;
a7767f95
HH		 744 }
745
902acc78
JB		 746 return RX_CONTINUE;
747}
33b64eb2 748
d3b2fb53 749static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 750 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 751 int index,
752 struct sk_buff_head *frames)
1edfb1af 753{
83eb935e
MK		 754 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
755 struct sk_buff *skb;
4cfda47b 756 struct ieee80211_rx_status *status;
1edfb1af 757
dd318575
JB		 758 lockdep_assert_held(&tid_agg_rx->reorder_lock);
759
83eb935e 760 if (skb_queue_empty(skb_list))
1edfb1af
JB		 761 goto no_frame;
762
83eb935e
MK		 763 if (!ieee80211_rx_reorder_ready(skb_list)) {
764 __skb_queue_purge(skb_list);
765 goto no_frame;
766 }
767
768 /* release frames from the reorder ring buffer */
1edfb1af 769 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 770 while ((skb = __skb_dequeue(skb_list))) {
771 status = IEEE80211_SKB_RXCB(skb);
772 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
773 __skb_queue_tail(frames, skb);
774 }
1edfb1af
JB		 775
776no_frame:
9a886586 777 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 778}
779
d3b2fb53 780static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 781 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 782 u16 head_seq_num,
783 struct sk_buff_head *frames)
1edfb1af
JB		 784{
785 int index;
786
dd318575
JB		 787 lockdep_assert_held(&tid_agg_rx->reorder_lock);
788
9a886586 789 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 790 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 791 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
792 frames);
1edfb1af
JB		 793 }
794}
795
796/*
797 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
798 * the skb was added to the buffer longer than this time ago, the earlier
799 * frames that have not yet been received are assumed to be lost and the skb
800 * can be released for processing. This may also release other skb's from the
801 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 802 *
803 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 804 */
805#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
806
d3b2fb53 807static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 808 struct tid_ampdu_rx *tid_agg_rx,
809 struct sk_buff_head *frames)
aa0c8636 810{
83eb935e 811 int index, i, j;
aa0c8636 812
dd318575
JB		 813 lockdep_assert_held(&tid_agg_rx->reorder_lock);
814
aa0c8636 815 /* release the buffer until next missing frame */
2e3049b7 816 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
83eb935e 817 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
07ae2dfc 818 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 819 /*
820 * No buffers ready to be released, but check whether any
821 * frames in the reorder buffer have timed out.
822 */
aa0c8636
CL		 823 int skipped = 1;
824 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
825 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 826 if (!ieee80211_rx_reorder_ready(
827 &tid_agg_rx->reorder_buf[j])) {
aa0c8636
CL		 828 skipped++;
829 continue;
830 }
499fe9a4
DH		 831 if (skipped &&
832 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 833 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 834 goto set_release_timer;
aa0c8636 835
83eb935e
MK		 836 /* don't leave incomplete A-MSDUs around */
837 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
838 i = (i + 1) % tid_agg_rx->buf_size)
839 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
840
bdcbd8e0
JB		 841 ht_dbg_ratelimited(sdata,
842 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 843 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
844 frames);
aa0c8636
CL		 845
846 /*
847 * Increment the head seq# also for the skipped slots.
848 */
849 tid_agg_rx->head_seq_num =
9a886586
JB		 850 (tid_agg_rx->head_seq_num +
851 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 852 skipped = 0;
853 }
83eb935e
MK		 854 } else while (ieee80211_rx_reorder_ready(
855 &tid_agg_rx->reorder_buf[index])) {
f9e124fb
CL		 856 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
857 frames);
2e3049b7 858 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 859 }
2bff8ebf
CL		 860
861 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 862 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 863
864 for (; j != (index - 1) % tid_agg_rx->buf_size;
865 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 866 if (ieee80211_rx_reorder_ready(
867 &tid_agg_rx->reorder_buf[j]))
2bff8ebf
CL		 868 break;
869 }
870
871 set_release_timer:
872
873 mod_timer(&tid_agg_rx->reorder_timer,
334df731 874 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 875 HT_RX_REORDER_BUF_TIMEOUT);
876 } else {
877 del_timer(&tid_agg_rx->reorder_timer);
878 }
aa0c8636
CL		 879}
880
1edfb1af
JB		 881/*
882 * As this function belongs to the RX path it must be under
883 * rcu_read_lock protection. It returns false if the frame
884 * can be processed immediately, true if it was consumed.
885 */
d3b2fb53 886static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 887 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 888 struct sk_buff *skb,
889 struct sk_buff_head *frames)
1edfb1af
JB		 890{
891 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 893 u16 sc = le16_to_cpu(hdr->seq_ctrl);
894 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
895 u16 head_seq_num, buf_size;
896 int index;
2bff8ebf 897 bool ret = true;
1edfb1af 898
dd318575
JB		 899 spin_lock(&tid_agg_rx->reorder_lock);
900
4549cf2b
MK		 901 /*
902 * Offloaded BA sessions have no known starting sequence number so pick
903 * one from first Rxed frame for this tid after BA was started.
904 */
905 if (unlikely(tid_agg_rx->auto_seq)) {
906 tid_agg_rx->auto_seq = false;
907 tid_agg_rx->ssn = mpdu_seq_num;
908 tid_agg_rx->head_seq_num = mpdu_seq_num;
909 }
910
1edfb1af
JB		 911 buf_size = tid_agg_rx->buf_size;
912 head_seq_num = tid_agg_rx->head_seq_num;
913
914 /* frame with out of date sequence number */
9a886586 915 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 916 dev_kfree_skb(skb);
2bff8ebf 917 goto out;
1edfb1af
JB		 918 }
919
920 /*
921 * If frame the sequence number exceeds our buffering window
922 * size release some previous frames to make room for this one.
923 */
9a886586
JB		 924 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
925 head_seq_num = ieee80211_sn_inc(
926 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 927 /* release stored frames up to new head to stack */
d3b2fb53 928 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 929 head_seq_num, frames);
1edfb1af
JB		 930 }
931
932 /* Now the new frame is always in the range of the reordering buffer */
933
2e3049b7 934 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 935
936 /* check if we already stored this frame */
83eb935e 937 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
1edfb1af 938 dev_kfree_skb(skb);
2bff8ebf 939 goto out;
1edfb1af
JB		 940 }
941
942 /*
943 * If the current MPDU is in the right order and nothing else
944 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 945 * If it is first but there's something stored, we may be able
946 * to release frames after this one.
1edfb1af
JB		 947 */
948 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
949 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 950 if (!(status->flag & RX_FLAG_AMSDU_MORE))
951 tid_agg_rx->head_seq_num =
952 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 953 ret = false;
954 goto out;
1edfb1af
JB		 955 }
956
957 /* put the frame in the reordering buffer */
83eb935e
MK		 958 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
959 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
960 tid_agg_rx->reorder_time[index] = jiffies;
961 tid_agg_rx->stored_mpdu_num++;
962 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
963 }
1edfb1af 964
2bff8ebf
CL		 965 out:
966 spin_unlock(&tid_agg_rx->reorder_lock);
967 return ret;
1edfb1af
JB		 968}
969
970/*
971 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
972 * true if the MPDU was buffered, false if it should be processed.
973 */
f9e124fb
CL		 974static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
975 struct sk_buff_head *frames)
1edfb1af 976{
2569a826
JB		 977 struct sk_buff *skb = rx->skb;
978 struct ieee80211_local *local = rx->local;
1edfb1af 979 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 980 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 981 struct sta_info *sta = rx->sta;
1edfb1af
JB		 982 struct tid_ampdu_rx *tid_agg_rx;
983 u16 sc;
6cc00d54 984 u8 tid, ack_policy;
1edfb1af 985
051a41fa
JB		 986 if (!ieee80211_is_data_qos(hdr->frame_control) ||
987 is_multicast_ether_addr(hdr->addr1))
2569a826 988 goto dont_reorder;
1edfb1af
JB		 989
990 /*
991 * filter the QoS data rx stream according to
992 * STA/TID and check if this STA/TID is on aggregation
993 */
994
1edfb1af 995 if (!sta)
2569a826 996 goto dont_reorder;
1edfb1af 997
6cc00d54
TP		 998 ack_policy = *ieee80211_get_qos_ctl(hdr) &
999 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1000 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1001
a87f736d
JB		 1002 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1003 if (!tid_agg_rx)
1004 goto dont_reorder;
1edfb1af
JB		 1005
1006 /* qos null data frames are excluded */
1007 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1008 goto dont_reorder;
1edfb1af 1009
6cc00d54
TP		 1010 /* not part of a BA session */
1011 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1012 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1013 goto dont_reorder;
1014
660c6a44
TP		 1015 /* not actually part of this BA session */
1016 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1017 goto dont_reorder;
1018
1edfb1af
JB		 1019 /* new, potentially un-ordered, ampdu frame - process it */
1020
1021 /* reset session timer */
1022 if (tid_agg_rx->timeout)
12d3952f 1023 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1024
1025 /* if this mpdu is fragmented - terminate rx aggregation session */
1026 sc = le16_to_cpu(hdr->seq_ctrl);
1027 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1028 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1029 skb_queue_tail(&rx->sdata->skb_queue, skb);
1030 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1031 return;
1edfb1af
JB		 1032 }
1033
a87f736d
JB		 1034 /*
1035 * No locking needed -- we will only ever process one
1036 * RX packet at a time, and thus own tid_agg_rx. All
1037 * other code manipulating it needs to (and does) make
1038 * sure that we cannot get to it any more before doing
1039 * anything with it.
1040 */
f9e124fb
CL		 1041 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1042 frames))
2569a826
JB		 1043 return;
1044
1045 dont_reorder:
f9e124fb 1046 __skb_queue_tail(frames, skb);
1edfb1af 1047}
33b64eb2 1048
49461622 1049static ieee80211_rx_result debug_noinline
0395442a 1050ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1051{
a7767f95 1052 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1053 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1054
6b0f3274
JB		 1055 /*
1056 * Drop duplicate 802.11 retransmissions
1057 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1058 */
0395442a
JB		 1059
1060 if (rx->skb->len < 24)
1061 return RX_CONTINUE;
1062
1063 if (ieee80211_is_ctl(hdr->frame_control) ||
1064 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1065 is_multicast_ether_addr(hdr->addr1))
1066 return RX_CONTINUE;
1067
1068 if (rx->sta) {
a7767f95 1069 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 1070 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 1071 hdr->seq_ctrl)) {
554891e6 1072 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 1073 rx->local->dot11FrameDuplicateCount++;
1074 rx->sta->num_duplicates++;
1075 }
b1f93314 1076 return RX_DROP_UNUSABLE;
0cfcefef 1077 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
9e26297a 1078 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
0cfcefef 1079 }
571ecf67
JB		 1080 }
1081
0395442a
JB		 1082 return RX_CONTINUE;
1083}
1084
1085static ieee80211_rx_result debug_noinline
1086ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1087{
1088 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1089
571ecf67
JB		 1090 if (unlikely(rx->skb->len < 16)) {
1091 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 1092 return RX_DROP_MONITOR;
571ecf67
JB		 1093 }
1094
571ecf67
JB		 1095 /* Drop disallowed frame classes based on STA auth/assoc state;
1096 * IEEE 802.11, Chap 5.5.
1097 *
ccd7b362
JB		 1098 * mac80211 filters only based on association state, i.e. it drops
1099 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1100 * deauth/disassoc frames when needed. In addition, hostapd is
1101 * responsible for filtering on both auth and assoc states.
1102 */
33b64eb2 1103
902acc78 1104 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1105 return ieee80211_rx_mesh_check(rx);
33b64eb2 1106
a7767f95
HH		 1107 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1108 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1109 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1110 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1111 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1112 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1113 /*
1114 * accept port control frames from the AP even when it's not
1115 * yet marked ASSOC to prevent a race where we don't set the
1116 * assoc bit quickly enough before it sends the first frame
1117 */
1118 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1119 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1120 unsigned int hdrlen;
1121 __be16 ethertype;
1122
1123 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1124
1125 if (rx->skb->len < hdrlen + 8)
1126 return RX_DROP_MONITOR;
1127
1128 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1129 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1130 return RX_CONTINUE;
1131 }
21fc7560
JB		 1132
1133 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1134 cfg80211_rx_spurious_frame(rx->sdata->dev,
1135 hdr->addr2,
1136 GFP_ATOMIC))
1137 return RX_DROP_UNUSABLE;
1138
e4c26add 1139 return RX_DROP_MONITOR;
2a33bee2 1140 }
571ecf67 1141
9ae54c84 1142 return RX_CONTINUE;
570bd537
JB		 1143}
1144
1145
572e0012
KV		 1146static ieee80211_rx_result debug_noinline
1147ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1148{
1149 struct ieee80211_local *local;
1150 struct ieee80211_hdr *hdr;
1151 struct sk_buff *skb;
1152
1153 local = rx->local;
1154 skb = rx->skb;
1155 hdr = (struct ieee80211_hdr *) skb->data;
1156
1157 if (!local->pspolling)
1158 return RX_CONTINUE;
1159
1160 if (!ieee80211_has_fromds(hdr->frame_control))
1161 /* this is not from AP */
1162 return RX_CONTINUE;
1163
1164 if (!ieee80211_is_data(hdr->frame_control))
1165 return RX_CONTINUE;
1166
1167 if (!ieee80211_has_moredata(hdr->frame_control)) {
1168 /* AP has no more frames buffered for us */
1169 local->pspolling = false;
1170 return RX_CONTINUE;
1171 }
1172
1173 /* more data bit is set, let's request a new frame from the AP */
1174 ieee80211_send_pspoll(local, rx->sdata);
1175
1176 return RX_CONTINUE;
1177}
1178
d012a605 1179static void sta_ps_start(struct sta_info *sta)
571ecf67 1180{
133b8226 1181 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1182 struct ieee80211_local *local = sdata->local;
d012a605 1183 struct ps_data *ps;
0795af57 1184
d012a605
MP		 1185 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1186 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1187 ps = &sdata->bss->ps;
1188 else
1189 return;
1190
1191 atomic_inc(&ps->num_sta_ps);
c2c98fde 1192 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1193 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1194 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1195 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1196 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1197}
1198
d012a605 1199static void sta_ps_end(struct sta_info *sta)
571ecf67 1200{
bdcbd8e0
JB		 1201 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1202 sta->sta.addr, sta->sta.aid);
004c872e 1203
c2c98fde 1204 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1205 /*
1206 * Clear the flag only if the other one is still set
1207 * so that the TX path won't start TX'ing new frames
1208 * directly ... In the case that the driver flag isn't
1209 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1210 */
1211 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1212 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1213 sta->sta.addr, sta->sta.aid);
af818581
JB		 1214 return;
1215 }
1216
5ac2e350
JB		 1217 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1218 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1219 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1220}
1221
d057e5a3
AN		 1222int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1223{
1224 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1225 bool in_ps;
1226
1227 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1228
1229 /* Don't let the same PS state be set twice */
c2c98fde 1230 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1231 if ((start && in_ps) || (!start && !in_ps))
1232 return -EINVAL;
1233
1234 if (start)
d012a605 1235 sta_ps_start(sta_inf);
d057e5a3 1236 else
d012a605 1237 sta_ps_end(sta_inf);
d057e5a3
AN		 1238
1239 return 0;
1240}
1241EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1242
47086fc5
JB		 1243static ieee80211_rx_result debug_noinline
1244ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1245{
1246 struct ieee80211_sub_if_data *sdata = rx->sdata;
1247 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1248 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1249 int tid, ac;
1250
1251 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1252 return RX_CONTINUE;
1253
1254 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1255 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1256 return RX_CONTINUE;
1257
1258 /*
1259 * The device handles station powersave, so don't do anything about
1260 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1261 * it to mac80211 since they're handled.)
1262 */
1263 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1264 return RX_CONTINUE;
1265
1266 /*
1267 * Don't do anything if the station isn't already asleep. In
1268 * the uAPSD case, the station will probably be marked asleep,
1269 * in the PS-Poll case the station must be confused ...
1270 */
c2c98fde 1271 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1272 return RX_CONTINUE;
1273
1274 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1275 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1276 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1277 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1278 else
c2c98fde 1279 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1280 }
47086fc5
JB		 1281
1282 /* Free PS Poll skb here instead of returning RX_DROP that would
1283 * count as an dropped frame. */
1284 dev_kfree_skb(rx->skb);
1285
1286 return RX_QUEUED;
1287 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1288 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1289 ieee80211_has_pm(hdr->frame_control) &&
1290 (ieee80211_is_data_qos(hdr->frame_control) ||
1291 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1292 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1293 ac = ieee802_1d_to_ac[tid & 7];
1294
1295 /*
1296 * If this AC is not trigger-enabled do nothing.
1297 *
1298 * NB: This could/should check a separate bitmap of trigger-
1299 * enabled queues, but for now we only implement uAPSD w/o
1300 * TSPEC changes to the ACs, so they're always the same.
1301 */
1302 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1303 return RX_CONTINUE;
1304
1305 /* if we are in a service period, do nothing */
c2c98fde 1306 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1307 return RX_CONTINUE;
1308
c2c98fde 1309 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1310 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1311 else
c2c98fde 1312 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1313 }
1314
1315 return RX_CONTINUE;
1316}
1317
49461622 1318static ieee80211_rx_result debug_noinline
5cf121c3 1319ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1320{
1321 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1322 struct sk_buff *skb = rx->skb;
1323 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1324 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1325 int i;
571ecf67
JB		 1326
1327 if (!sta)
9ae54c84 1328 return RX_CONTINUE;
571ecf67 1329
b291ba11
JB		 1330 /*
1331 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1332 * BSSID and for station already AUTHORIZED to avoid keeping the
1333 * current IBSS network alive in cases where other STAs start
1334 * using different BSSID. This will also give the station another
1335 * chance to restart the authentication/authorization in case
1336 * something went wrong the first time.
b291ba11 1337 */
05c914fe 1338 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1339 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1340 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1341 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1342 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1343 sta->last_rx = jiffies;
f4ebddf9
HR		 1344 if (ieee80211_is_data(hdr->frame_control) &&
1345 !is_multicast_ether_addr(hdr->addr1)) {
3af6334c
FF		 1346 sta->last_rx_rate_idx = status->rate_idx;
1347 sta->last_rx_rate_flag = status->flag;
1b8d242a 1348 sta->last_rx_rate_vht_flag = status->vht_flag;
5614618e 1349 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1350 }
1351 }
239281f8
RL		 1352 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1353 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1354 NL80211_IFTYPE_OCB);
1355 /* OCB uses wild-card BSSID */
1356 if (is_broadcast_ether_addr(bssid))
1357 sta->last_rx = jiffies;
b291ba11
JB		 1358 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1359 /*
33b64eb2
LCC		 1360 * Mesh beacons will update last_rx when if they are found to
1361 * match the current local configuration when processed.
571ecf67 1362 */
b291ba11 1363 sta->last_rx = jiffies;
3af6334c
FF		 1364 if (ieee80211_is_data(hdr->frame_control)) {
1365 sta->last_rx_rate_idx = status->rate_idx;
1366 sta->last_rx_rate_flag = status->flag;
b8ff416b 1367 sta->last_rx_rate_vht_flag = status->vht_flag;
5614618e 1368 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1369 }
571ecf67
JB		 1370 }
1371
554891e6 1372 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1373 return RX_CONTINUE;
571ecf67 1374
3cf335d5
KV		 1375 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1376 ieee80211_sta_rx_notify(rx->sdata, hdr);
1377
571ecf67
JB		 1378 sta->rx_fragments++;
1379 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1380 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1381 sta->last_signal = status->signal;
1382 ewma_add(&sta->avg_signal, -status->signal);
1383 }
571ecf67 1384
ef0621e8
FF		 1385 if (status->chains) {
1386 sta->chains = status->chains;
1387 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1388 int signal = status->chain_signal[i];
1389
1390 if (!(status->chains & BIT(i)))
1391 continue;
1392
1393 sta->chain_signal_last[i] = signal;
1394 ewma_add(&sta->chain_signal_avg[i], -signal);
1395 }
1396 }
1397
72eaa43a
JB		 1398 /*
1399 * Change STA power saving mode only at the end of a frame
1400 * exchange sequence.
1401 */
d057e5a3
AN		 1402 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1403 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1404 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1405 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1406 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1407 /* PM bit is only checked in frames where it isn't reserved,
1408 * in AP mode it's reserved in non-bufferable management frames
1409 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1410 */
1411 (!ieee80211_is_mgmt(hdr->frame_control) ||
1412 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1413 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1414 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1415 sta_ps_end(sta);
72eaa43a
JB		 1416 } else {
1417 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1418 sta_ps_start(sta);
72eaa43a 1419 }
571ecf67
JB		 1420 }
1421
3f52b7e3
MP		 1422 /* mesh power save support */
1423 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1424 ieee80211_mps_rx_h_sta_process(sta, hdr);
1425
22403def
JB		 1426 /*
1427 * Drop (qos-)data::nullfunc frames silently, since they
1428 * are used only to control station power saving mode.
1429 */
1430 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1431 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1432 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1433
1434 /*
1435 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1436 * that was not moved to a 4-addr STA vlan yet send
1437 * the event to userspace and for older hostapd drop
1438 * the frame to the monitor interface.
d524215f
FF		 1439 */
1440 if (ieee80211_has_a4(hdr->frame_control) &&
1441 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1442 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1443 !rx->sdata->u.vlan.sta))) {
1444 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1445 cfg80211_rx_unexpected_4addr_frame(
1446 rx->sdata->dev, sta->sta.addr,
1447 GFP_ATOMIC);
d524215f 1448 return RX_DROP_MONITOR;
e7f4a940 1449 }
22403def
JB		 1450 /*
1451 * Update counter and free packet here to avoid
1452 * counting this as a dropped packed.
1453 */
571ecf67
JB		 1454 sta->rx_packets++;
1455 dev_kfree_skb(rx->skb);
9ae54c84 1456 return RX_QUEUED;
571ecf67
JB		 1457 }
1458
9ae54c84 1459 return RX_CONTINUE;
571ecf67
JB		 1460} /* ieee80211_rx_h_sta_process */
1461
86c228a7
JA		 1462static ieee80211_rx_result debug_noinline
1463ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1464{
1465 struct sk_buff *skb = rx->skb;
1466 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1467 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1468 int keyidx;
1469 int hdrlen;
1470 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1471 struct ieee80211_key *sta_ptk = NULL;
1472 int mmie_keyidx = -1;
1473 __le16 fc;
2475b1cc 1474 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1475
1476 /*
1477 * Key selection 101
1478 *
1479 * There are four types of keys:
1480 * - GTK (group keys)
1481 * - IGTK (group keys for management frames)
1482 * - PTK (pairwise keys)
1483 * - STK (station-to-station pairwise keys)
1484 *
1485 * When selecting a key, we have to distinguish between multicast
1486 * (including broadcast) and unicast frames, the latter can only
1487 * use PTKs and STKs while the former always use GTKs and IGTKs.
1488 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1489 * unicast frames can also use key indices like GTKs. Hence, if we
1490 * don't have a PTK/STK we check the key index for a WEP key.
1491 *
1492 * Note that in a regular BSS, multicast frames are sent by the
1493 * AP only, associated stations unicast the frame to the AP first
1494 * which then multicasts it on their behalf.
1495 *
1496 * There is also a slight problem in IBSS mode: GTKs are negotiated
1497 * with each station, that is something we don't currently handle.
1498 * The spec seems to expect that one negotiates the same key with
1499 * every station but there's no such requirement; VLANs could be
1500 * possible.
1501 */
1502
1503 /*
1504 * No point in finding a key and decrypting if the frame is neither
1505 * addressed to us nor a multicast frame.
1506 */
1507 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1508 return RX_CONTINUE;
1509
1510 /* start without a key */
1511 rx->key = NULL;
2475b1cc 1512 fc = hdr->frame_control;
86c228a7 1513
2475b1cc
MS		 1514 if (rx->sta) {
1515 int keyid = rx->sta->ptk_idx;
86c228a7 1516
2475b1cc
MS		 1517 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1518 cs = rx->sta->cipher_scheme;
1519 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1520 if (unlikely(keyid < 0))
1521 return RX_DROP_UNUSABLE;
1522 }
1523 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1524 }
86c228a7
JA		 1525
1526 if (!ieee80211_has_protected(fc))
1527 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1528
1529 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1530 rx->key = sta_ptk;
1531 if ((status->flag & RX_FLAG_DECRYPTED) &&
1532 (status->flag & RX_FLAG_IV_STRIPPED))
1533 return RX_CONTINUE;
1534 /* Skip decryption if the frame is not protected. */
1535 if (!ieee80211_has_protected(fc))
1536 return RX_CONTINUE;
1537 } else if (mmie_keyidx >= 0) {
1538 /* Broadcast/multicast robust management frame / BIP */
1539 if ((status->flag & RX_FLAG_DECRYPTED) &&
1540 (status->flag & RX_FLAG_IV_STRIPPED))
1541 return RX_CONTINUE;
1542
1543 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1544 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1545 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1546 if (rx->sta)
1547 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1548 if (!rx->key)
1549 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1550 } else if (!ieee80211_has_protected(fc)) {
1551 /*
1552 * The frame was not protected, so skip decryption. However, we
1553 * need to set rx->key if there is a key that could have been
1554 * used so that the frame may be dropped if encryption would
1555 * have been expected.
1556 */
1557 struct ieee80211_key *key = NULL;
1558 struct ieee80211_sub_if_data *sdata = rx->sdata;
1559 int i;
1560
1561 if (ieee80211_is_mgmt(fc) &&
1562 is_multicast_ether_addr(hdr->addr1) &&
1563 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1564 rx->key = key;
1565 else {
1566 if (rx->sta) {
1567 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1568 key = rcu_dereference(rx->sta->gtk[i]);
1569 if (key)
1570 break;
1571 }
1572 }
1573 if (!key) {
1574 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1575 key = rcu_dereference(sdata->keys[i]);
1576 if (key)
1577 break;
1578 }
1579 }
1580 if (key)
1581 rx->key = key;
1582 }
1583 return RX_CONTINUE;
1584 } else {
1585 u8 keyid;
2475b1cc 1586
86c228a7
JA		 1587 /*
1588 * The device doesn't give us the IV so we won't be
1589 * able to look up the key. That's ok though, we
1590 * don't need to decrypt the frame, we just won't
1591 * be able to keep statistics accurate.
1592 * Except for key threshold notifications, should
1593 * we somehow allow the driver to tell us which key
1594 * the hardware used if this flag is set?
1595 */
1596 if ((status->flag & RX_FLAG_DECRYPTED) &&
1597 (status->flag & RX_FLAG_IV_STRIPPED))
1598 return RX_CONTINUE;
1599
1600 hdrlen = ieee80211_hdrlen(fc);
1601
2475b1cc
MS		 1602 if (cs) {
1603 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1604
2475b1cc
MS		 1605 if (unlikely(keyidx < 0))
1606 return RX_DROP_UNUSABLE;
1607 } else {
1608 if (rx->skb->len < 8 + hdrlen)
1609 return RX_DROP_UNUSABLE; /* TODO: count this? */
1610 /*
1611 * no need to call ieee80211_wep_get_keyidx,
1612 * it verifies a bunch of things we've done already
1613 */
1614 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1615 keyidx = keyid >> 6;
1616 }
86c228a7
JA		 1617
1618 /* check per-station GTK first, if multicast packet */
1619 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1620 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1621
1622 /* if not found, try default key */
1623 if (!rx->key) {
1624 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1625
1626 /*
1627 * RSNA-protected unicast frames should always be
1628 * sent with pairwise or station-to-station keys,
1629 * but for WEP we allow using a key index as well.
1630 */
1631 if (rx->key &&
1632 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1633 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1634 !is_multicast_ether_addr(hdr->addr1))
1635 rx->key = NULL;
1636 }
1637 }
1638
1639 if (rx->key) {
1640 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1641 return RX_DROP_MONITOR;
1642
1643 rx->key->tx_rx_count++;
1644 /* TODO: add threshold stuff again */
1645 } else {
1646 return RX_DROP_MONITOR;
1647 }
1648
1649 switch (rx->key->conf.cipher) {
1650 case WLAN_CIPHER_SUITE_WEP40:
1651 case WLAN_CIPHER_SUITE_WEP104:
1652 result = ieee80211_crypto_wep_decrypt(rx);
1653 break;
1654 case WLAN_CIPHER_SUITE_TKIP:
1655 result = ieee80211_crypto_tkip_decrypt(rx);
1656 break;
1657 case WLAN_CIPHER_SUITE_CCMP:
1658 result = ieee80211_crypto_ccmp_decrypt(rx);
1659 break;
1660 case WLAN_CIPHER_SUITE_AES_CMAC:
1661 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1662 break;
1663 default:
2475b1cc 1664 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1665 }
1666
1667 /* the hdr variable is invalid after the decrypt handlers */
1668
1669 /* either the frame has been decrypted or will be dropped */
1670 status->flag |= RX_FLAG_DECRYPTED;
1671
1672 return result;
1673}
1674
571ecf67
JB		 1675static inline struct ieee80211_fragment_entry *
1676ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1677 unsigned int frag, unsigned int seq, int rx_queue,
1678 struct sk_buff **skb)
1679{
1680 struct ieee80211_fragment_entry *entry;
571ecf67 1681
571ecf67
JB		 1682 entry = &sdata->fragments[sdata->fragment_next++];
1683 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1684 sdata->fragment_next = 0;
1685
bdcbd8e0 1686 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1687 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1688
1689 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1690 *skb = NULL;
1691 entry->first_frag_time = jiffies;
1692 entry->seq = seq;
1693 entry->rx_queue = rx_queue;
1694 entry->last_frag = frag;
1695 entry->ccmp = 0;
1696 entry->extra_len = 0;
1697
1698 return entry;
1699}
1700
1701static inline struct ieee80211_fragment_entry *
1702ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1703 unsigned int frag, unsigned int seq,
571ecf67
JB		 1704 int rx_queue, struct ieee80211_hdr *hdr)
1705{
1706 struct ieee80211_fragment_entry *entry;
1707 int i, idx;
1708
1709 idx = sdata->fragment_next;
1710 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1711 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1712
1713 idx--;
1714 if (idx < 0)
1715 idx = IEEE80211_FRAGMENT_MAX - 1;
1716
1717 entry = &sdata->fragments[idx];
1718 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1719 entry->rx_queue != rx_queue ||
1720 entry->last_frag + 1 != frag)
1721 continue;
1722
b73d70ad 1723 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1724
b73d70ad
HH		 1725 /*
1726 * Check ftype and addresses are equal, else check next fragment
1727 */
1728 if (((hdr->frame_control ^ f_hdr->frame_control) &
1729 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1730 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1731 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1732 continue;
1733
ab46623e 1734 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1735 __skb_queue_purge(&entry->skb_list);
1736 continue;
1737 }
1738 return entry;
1739 }
1740
1741 return NULL;
1742}
1743
49461622 1744static ieee80211_rx_result debug_noinline
5cf121c3 1745ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1746{
1747 struct ieee80211_hdr *hdr;
1748 u16 sc;
358c8d9d 1749 __le16 fc;
571ecf67
JB		 1750 unsigned int frag, seq;
1751 struct ieee80211_fragment_entry *entry;
1752 struct sk_buff *skb;
554891e6 1753 struct ieee80211_rx_status *status;
571ecf67 1754
b73d70ad 1755 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1756 fc = hdr->frame_control;
f7fbf70e
JC		 1757
1758 if (ieee80211_is_ctl(fc))
1759 return RX_CONTINUE;
1760
571ecf67
JB		 1761 sc = le16_to_cpu(hdr->seq_ctrl);
1762 frag = sc & IEEE80211_SCTL_FRAG;
1763
b8fff407
JB		 1764 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1765 goto out;
1766
1767 if (is_multicast_ether_addr(hdr->addr1)) {
1768 rx->local->dot11MulticastReceivedFrameCount++;
571ecf67
JB		 1769 goto out;
1770 }
b8fff407 1771
571ecf67
JB		 1772 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1773
e3cf8b3f
ZY		 1774 if (skb_linearize(rx->skb))
1775 return RX_DROP_UNUSABLE;
1776
058897a4
AK		 1777 /*
1778 * skb_linearize() might change the skb->data and
1779 * previously cached variables (in this case, hdr) need to
1780 * be refreshed with the new data.
1781 */
1782 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1783 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1784
1785 if (frag == 0) {
1786 /* This is the first fragment of a new frame. */
1787 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1788 rx->seqno_idx, &(rx->skb));
97359d12 1789 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1790 ieee80211_has_protected(fc)) {
9e26297a 1791 int queue = rx->security_idx;
571ecf67
JB		 1792 /* Store CCMP PN so that we can verify that the next
1793 * fragment has a sequential PN value. */
1794 entry->ccmp = 1;
1795 memcpy(entry->last_pn,
9190252c 1796 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1797 IEEE80211_CCMP_PN_LEN);
571ecf67 1798 }
9ae54c84 1799 return RX_QUEUED;
571ecf67
JB		 1800 }
1801
1802 /* This is a fragment for a frame that should already be pending in
1803 * fragment cache. Add this fragment to the end of the pending entry.
1804 */
9e26297a
JB		 1805 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1806 rx->seqno_idx, hdr);
571ecf67
JB		 1807 if (!entry) {
1808 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1809 return RX_DROP_MONITOR;
571ecf67
JB		 1810 }
1811
1812 /* Verify that MPDUs within one MSDU have sequential PN values.
1813 * (IEEE 802.11i, 8.3.3.4.5) */
1814 if (entry->ccmp) {
1815 int i;
4325f6ca 1816 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1817 int queue;
97359d12 1818 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1819 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1820 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1821 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1822 pn[i]++;
1823 if (pn[i])
1824 break;
1825 }
9e26297a 1826 queue = rx->security_idx;
9190252c 1827 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1828 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1829 return RX_DROP_UNUSABLE;
4325f6ca 1830 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1831 }
1832
358c8d9d 1833 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1834 __skb_queue_tail(&entry->skb_list, rx->skb);
1835 entry->last_frag = frag;
1836 entry->extra_len += rx->skb->len;
358c8d9d 1837 if (ieee80211_has_morefrags(fc)) {
571ecf67 1838 rx->skb = NULL;
9ae54c84 1839 return RX_QUEUED;
571ecf67
JB		 1840 }
1841
1842 rx->skb = __skb_dequeue(&entry->skb_list);
1843 if (skb_tailroom(rx->skb) < entry->extra_len) {
1844 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1845 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1846 GFP_ATOMIC))) {
1847 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1848 __skb_queue_purge(&entry->skb_list);
e4c26add 1849 return RX_DROP_UNUSABLE;
571ecf67
JB		 1850 }
1851 }
1852 while ((skb = __skb_dequeue(&entry->skb_list))) {
1853 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1854 dev_kfree_skb(skb);
1855 }
1856
1857 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1858 status = IEEE80211_SKB_RXCB(rx->skb);
1859 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1860
1861 out:
1862 if (rx->sta)
1863 rx->sta->rx_packets++;
b8fff407 1864 ieee80211_led_rx(rx->local);
9ae54c84 1865 return RX_CONTINUE;
571ecf67
JB		 1866}
1867
1df332e8 1868static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1869{
1df332e8 1870 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1871 return -EACCES;
571ecf67 1872
76ee65bf 1873 return 0;
571ecf67
JB		 1874}
1875
1df332e8 1876static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1877{
eb9fb5b8
JB		 1878 struct sk_buff *skb = rx->skb;
1879 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1880
3017b80b 1881 /*
7848ba7d
JB		 1882 * Pass through unencrypted frames if the hardware has
1883 * decrypted them already.
3017b80b 1884 */
eb9fb5b8 1885 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1886 return 0;
571ecf67
JB		 1887
1888 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1889 if (unlikely(!ieee80211_has_protected(fc) &&
1890 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1891 ieee80211_is_data(fc) &&
b3fc9c6c 1892 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1893 return -EACCES;
bef5d1c7
JB		 1894
1895 return 0;
1896}
1897
1df332e8 1898static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1899{
1900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1901 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1902 __le16 fc = hdr->frame_control;
bef5d1c7 1903
e3efca0a
JM		 1904 /*
1905 * Pass through unencrypted frames if the hardware has
1906 * decrypted them already.
1907 */
1908 if (status->flag & RX_FLAG_DECRYPTED)
1909 return 0;
bef5d1c7 1910
c2c98fde 1911 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1912 if (unlikely(!ieee80211_has_protected(fc) &&
1913 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1914 rx->key)) {
6ff57cf8
JB		 1915 if (ieee80211_is_deauth(fc) ||
1916 ieee80211_is_disassoc(fc))
1917 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1918 rx->skb->data,
1919 rx->skb->len);
f2ca3ea4 1920 return -EACCES;
cf4e594e 1921 }
f2ca3ea4 1922 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1923 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1924 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1925 if (ieee80211_is_deauth(fc) ||
1926 ieee80211_is_disassoc(fc))
1927 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1928 rx->skb->data,
1929 rx->skb->len);
f2ca3ea4 1930 return -EACCES;
cf4e594e 1931 }
f2ca3ea4
JM		 1932 /*
1933 * When using MFP, Action frames are not allowed prior to
1934 * having configured keys.
1935 */
1936 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 1937 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 1938 return -EACCES;
1939 }
b3fc9c6c 1940
76ee65bf 1941 return 0;
571ecf67
JB		 1942}
1943
76ee65bf 1944static int
4114fa21 1945__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1946{
eb9fb5b8 1947 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1948 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1949 bool check_port_control = false;
1950 struct ethhdr *ehdr;
1951 int ret;
f14543ee 1952
4114fa21 1953 *port_control = false;
9bc383de
JB		 1954 if (ieee80211_has_a4(hdr->frame_control) &&
1955 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1956 return -1;
9bc383de 1957
fbb327c5
FF		 1958 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1959 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1960
1961 if (!sdata->u.mgd.use_4addr)
1962 return -1;
1963 else
1964 check_port_control = true;
1965 }
1966
9bc383de 1967 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1968 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1969 return -1;
571ecf67 1970
fbb327c5 1971 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1972 if (ret < 0)
fbb327c5
FF		 1973 return ret;
1974
1975 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1976 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1977 *port_control = true;
1978 else if (check_port_control)
fbb327c5
FF		 1979 return -1;
1980
1981 return 0;
76ee65bf 1982}
571ecf67 1983
ce3edf6d
JB		 1984/*
1985 * requires that rx->skb is a frame with ethernet header
1986 */
358c8d9d 1987static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1988{
c97c23e3 1989 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1990 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1991 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1992
1993 /*
1994 * Allow EAPOL frames to us/the PAE group address regardless
1995 * of whether the frame was encrypted or not.
1996 */
a621fa4d 1997 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1998 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1999 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2000 return true;
2001
2002 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2003 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2004 return false;
2005
2006 return true;
2007}
2008
2009/*
2010 * requires that rx->skb is a frame with ethernet header
2011 */
76ee65bf 2012static void
5cf121c3 2013ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2014{
eb9fb5b8
JB		 2015 struct ieee80211_sub_if_data *sdata = rx->sdata;
2016 struct net_device *dev = sdata->dev;
76ee65bf 2017 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2018 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2019 struct sta_info *dsta;
554891e6 2020 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 2021
76ee65bf
RR		 2022 skb = rx->skb;
2023 xmit_skb = NULL;
571ecf67 2024
05c914fe
JB		 2025 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2026 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2027 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 2028 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 2029 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2030 if (is_multicast_ether_addr(ehdr->h_dest)) {
2031 /*
2032 * send multicast frames both to higher layers in
2033 * local net stack and back to the wireless medium
2034 */
76ee65bf 2035 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2036 if (!xmit_skb)
bdcbd8e0 2037 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2038 dev->name);
571ecf67 2039 } else {
abe60632
JB		 2040 dsta = sta_info_get(sdata, skb->data);
2041 if (dsta) {
ce3edf6d
JB		 2042 /*
2043 * The destination station is associated to
2044 * this AP (in this VLAN), so send the frame
2045 * directly to it and do not pass it to local
2046 * net stack.
571ecf67 2047 */
76ee65bf 2048 xmit_skb = skb;
571ecf67
JB		 2049 skb = NULL;
2050 }
571ecf67
JB		 2051 }
2052 }
2053
59d9cb07 2054#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2055 if (skb) {
2056 /* 'align' will only take the values 0 or 2 here since all
2057 * frames are required to be aligned to 2-byte boundaries
2058 * when being passed to mac80211; the code here works just
2059 * as well if that isn't true, but mac80211 assumes it can
2060 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2061 */
9e890a1f
JB		 2062 int align;
2063
2064 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2065 if (align) {
2066 if (WARN_ON(skb_headroom(skb) < 3)) {
2067 dev_kfree_skb(skb);
2068 skb = NULL;
2069 } else {
2070 u8 *data = skb->data;
8ce0b589
ZY		 2071 size_t len = skb_headlen(skb);
2072 skb->data -= align;
2073 memmove(skb->data, data, len);
2074 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2075 }
2076 }
9e890a1f 2077 }
d1c3a37c
JB		 2078#endif
2079
9e890a1f
JB		 2080 if (skb) {
2081 /* deliver to local stack */
2082 skb->protocol = eth_type_trans(skb, dev);
2083 memset(skb->cb, 0, sizeof(skb->cb));
06d181a8
JB		 2084 if (rx->local->napi)
2085 napi_gro_receive(rx->local->napi, skb);
2086 else
2087 netif_receive_skb(skb);
571ecf67
JB		 2088 }
2089
76ee65bf 2090 if (xmit_skb) {
aef6c928
HS		 2091 /*
2092 * Send to wireless media and increase priority by 256 to
2093 * keep the received priority instead of reclassifying
2094 * the frame (see cfg80211_classify8021d).
2095 */
2096 xmit_skb->priority += 256;
f831e909 2097 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2098 skb_reset_network_header(xmit_skb);
2099 skb_reset_mac_header(xmit_skb);
76ee65bf 2100 dev_queue_xmit(xmit_skb);
571ecf67 2101 }
76ee65bf
RR		 2102}
2103
49461622 2104static ieee80211_rx_result debug_noinline
5cf121c3 2105ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2106{
eb9fb5b8 2107 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2108 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2109 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2110 __le16 fc = hdr->frame_control;
eaf85ca7 2111 struct sk_buff_head frame_list;
554891e6 2112 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2113
358c8d9d 2114 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2115 return RX_CONTINUE;
fd4c7f2f 2116
358c8d9d 2117 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2118 return RX_DROP_MONITOR;
fd4c7f2f 2119
554891e6 2120 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2121 return RX_CONTINUE;
fd4c7f2f 2122
eaf85ca7
ZY		 2123 if (ieee80211_has_a4(hdr->frame_control) &&
2124 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2125 !rx->sdata->u.vlan.sta)
e4c26add 2126 return RX_DROP_UNUSABLE;
fd4c7f2f 2127
eaf85ca7
ZY		 2128 if (is_multicast_ether_addr(hdr->addr1) &&
2129 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2130 rx->sdata->u.vlan.sta) ||
2131 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2132 rx->sdata->u.mgd.use_4addr)))
e4c26add 2133 return RX_DROP_UNUSABLE;
fd4c7f2f 2134
eaf85ca7
ZY		 2135 skb->dev = dev;
2136 __skb_queue_head_init(&frame_list);
fd4c7f2f 2137
e3cf8b3f
ZY		 2138 if (skb_linearize(skb))
2139 return RX_DROP_UNUSABLE;
2140
eaf85ca7
ZY		 2141 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2142 rx->sdata->vif.type,
8b3becad 2143 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2144
eaf85ca7
ZY		 2145 while (!skb_queue_empty(&frame_list)) {
2146 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2147
358c8d9d 2148 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2149 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2150 continue;
2151 }
eaf85ca7
ZY		 2152 dev->stats.rx_packets++;
2153 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 2154
2155 ieee80211_deliver_skb(rx);
2156 }
2157
9ae54c84 2158 return RX_QUEUED;
fd4c7f2f
RR		 2159}
2160
bf94e17b 2161#ifdef CONFIG_MAC80211_MESH
b0dee578 2162static ieee80211_rx_result
e32f85f7
LCC		 2163ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2164{
30789eb6
TP		 2165 struct ieee80211_hdr *fwd_hdr, *hdr;
2166 struct ieee80211_tx_info *info;
e32f85f7 2167 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2168 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2169 struct ieee80211_local *local = rx->local;
eb9fb5b8 2170 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2171 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2172 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2173 u16 q, hdrlen;
e32f85f7
LCC		 2174
2175 hdr = (struct ieee80211_hdr *) skb->data;
2176 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2177
2178 /* make sure fixed part of mesh header is there, also checks skb len */
2179 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2180 return RX_DROP_MONITOR;
2181
2182 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2183
2184 /* make sure full mesh header is there, also checks skb len */
2185 if (!pskb_may_pull(rx->skb,
2186 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2187 return RX_DROP_MONITOR;
2188
2189 /* reload pointers */
2190 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2191 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2192
2157fdd6
TP		 2193 /* frame is in RMC, don't forward */
2194 if (ieee80211_is_data(hdr->frame_control) &&
2195 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2196 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2197 return RX_DROP_MONITOR;
2198
555cb715
JC		 2199 if (!ieee80211_is_data(hdr->frame_control) ||
2200 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2201 return RX_CONTINUE;
2202
2203 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2204 return RX_DROP_MONITOR;
2205
43b7b314 2206 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2207 struct mesh_path *mppath;
43b7b314
JC		 2208 char *proxied_addr;
2209 char *mpp_addr;
2210
2211 if (is_multicast_ether_addr(hdr->addr1)) {
2212 mpp_addr = hdr->addr3;
2213 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2214 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2215 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2216 mpp_addr = hdr->addr4;
2217 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2218 } else {
2219 return RX_DROP_MONITOR;
43b7b314 2220 }
79617dee 2221
79617dee 2222 rcu_read_lock();
bf7cd94d 2223 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2224 if (!mppath) {
bf7cd94d 2225 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2226 } else {
2227 spin_lock_bh(&mppath->state_lock);
b203ca39 2228 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2229 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2230 spin_unlock_bh(&mppath->state_lock);
2231 }
2232 rcu_read_unlock();
2233 }
2234
3c5772a5
JC		 2235 /* Frame has reached destination. Don't forward */
2236 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2237 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2238 return RX_CONTINUE;
2239
00e96dec 2240 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2241 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2242 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2243 return RX_DROP_MONITOR;
2244 }
2245 skb_set_queue_mapping(skb, q);
e32f85f7 2246
30789eb6
TP		 2247 if (!--mesh_hdr->ttl) {
2248 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2249 goto out;
30789eb6
TP		 2250 }
2251
d665508b
CYY		 2252 if (!ifmsh->mshcfg.dot11MeshForwarding)
2253 goto out;
2254
30789eb6
TP		 2255 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2256 if (!fwd_skb) {
bdcbd8e0 2257 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2258 sdata->name);
30789eb6
TP		 2259 goto out;
2260 }
2261
2262 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2263 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2264 info = IEEE80211_SKB_CB(fwd_skb);
2265 memset(info, 0, sizeof(*info));
2266 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2267 info->control.vif = &rx->sdata->vif;
2268 info->control.jiffies = jiffies;
2269 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2270 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2271 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2272 /* update power mode indication when forwarding */
2273 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2274 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2275 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2276 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2277 } else {
2278 /* unable to resolve next hop */
bf7cd94d 2279 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2280 fwd_hdr->addr3, 0,
2281 WLAN_REASON_MESH_PATH_NOFORWARD,
2282 fwd_hdr->addr2);
30789eb6 2283 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2284 kfree_skb(fwd_skb);
30789eb6 2285 return RX_DROP_MONITOR;
e32f85f7
LCC		 2286 }
2287
30789eb6
TP		 2288 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2289 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2290 out:
3c5772a5 2291 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2292 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2293 return RX_CONTINUE;
2294 else
2295 return RX_DROP_MONITOR;
2296}
bf94e17b 2297#endif
e32f85f7 2298
49461622 2299static ieee80211_rx_result debug_noinline
5cf121c3 2300ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2301{
eb9fb5b8 2302 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2303 struct ieee80211_local *local = rx->local;
eb9fb5b8 2304 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2305 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2306 __le16 fc = hdr->frame_control;
4114fa21 2307 bool port_control;
ce3edf6d 2308 int err;
76ee65bf 2309
358c8d9d 2310 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2311 return RX_CONTINUE;
76ee65bf 2312
358c8d9d 2313 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2314 return RX_DROP_MONITOR;
76ee65bf 2315
f14543ee 2316 /*
e7f4a940
JB		 2317 * Send unexpected-4addr-frame event to hostapd. For older versions,
2318 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2319 */
2320 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2321 sdata->vif.type == NL80211_IFTYPE_AP) {
2322 if (rx->sta &&
2323 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2324 cfg80211_rx_unexpected_4addr_frame(
2325 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2326 return RX_DROP_MONITOR;
e7f4a940 2327 }
f14543ee 2328
4114fa21 2329 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2330 if (unlikely(err))
e4c26add 2331 return RX_DROP_UNUSABLE;
76ee65bf 2332
358c8d9d 2333 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2334 return RX_DROP_MONITOR;
ce3edf6d 2335
8a4d32f3
AN		 2336 /* directly handle TDLS channel switch requests/responses */
2337 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2338 cpu_to_be16(ETH_P_TDLS))) {
2339 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2340
2341 if (pskb_may_pull(rx->skb,
2342 offsetof(struct ieee80211_tdls_data, u)) &&
2343 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2344 tf->category == WLAN_CATEGORY_TDLS &&
2345 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2346 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2347 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2348 skb_queue_tail(&sdata->skb_queue, rx->skb);
2349 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2350 if (rx->sta)
2351 rx->sta->rx_packets++;
2352
2353 return RX_QUEUED;
2354 }
2355 }
2356
4114fa21
FF		 2357 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2358 unlikely(port_control) && sdata->bss) {
2359 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2360 u.ap);
2361 dev = sdata->dev;
2362 rx->sdata = sdata;
2363 }
2364
76ee65bf
RR		 2365 rx->skb->dev = dev;
2366
2367 dev->stats.rx_packets++;
2368 dev->stats.rx_bytes += rx->skb->len;
2369
08ca944e 2370 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2371 !is_multicast_ether_addr(
2372 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2373 (!local->scanning &&
2374 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2375 mod_timer(&local->dynamic_ps_timer, jiffies +
2376 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2377 }
2378
76ee65bf 2379 ieee80211_deliver_skb(rx);
571ecf67 2380
9ae54c84 2381 return RX_QUEUED;
571ecf67
JB		 2382}
2383
49461622 2384static ieee80211_rx_result debug_noinline
f9e124fb 2385ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2386{
71364716 2387 struct sk_buff *skb = rx->skb;
a7767f95 2388 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2389 struct tid_ampdu_rx *tid_agg_rx;
2390 u16 start_seq_num;
2391 u16 tid;
2392
a7767f95 2393 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2394 return RX_CONTINUE;
71364716 2395
a7767f95 2396 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2397 struct {
2398 __le16 control, start_seq_num;
2399 } __packed bar_data;
2400
71364716 2401 if (!rx->sta)
a02ae758 2402 return RX_DROP_MONITOR;
8ae5977f
JB		 2403
2404 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2405 &bar_data, sizeof(bar_data)))
2406 return RX_DROP_MONITOR;
2407
8ae5977f 2408 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2409
2410 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2411 if (!tid_agg_rx)
a02ae758 2412 return RX_DROP_MONITOR;
71364716 2413
8ae5977f 2414 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2415
2416 /* reset session timer */
20ad19d0
JB		 2417 if (tid_agg_rx->timeout)
2418 mod_timer(&tid_agg_rx->session_timer,
2419 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2420
dd318575 2421 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2422 /* release stored frames up to start of BAR */
d3b2fb53 2423 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2424 start_seq_num, frames);
dd318575
JB		 2425 spin_unlock(&tid_agg_rx->reorder_lock);
2426
a02ae758
JB		 2427 kfree_skb(skb);
2428 return RX_QUEUED;
71364716
RR		 2429 }
2430
08daecae
JB		 2431 /*
2432 * After this point, we only want management frames,
2433 * so we can drop all remaining control frames to
2434 * cooked monitor interfaces.
2435 */
2436 return RX_DROP_MONITOR;
71364716
RR		 2437}
2438
f4f727a6
JM		 2439static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2440 struct ieee80211_mgmt *mgmt,
2441 size_t len)
fea14732
JM		 2442{
2443 struct ieee80211_local *local = sdata->local;
2444 struct sk_buff *skb;
2445 struct ieee80211_mgmt *resp;
2446
b203ca39 2447 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2448 /* Not to own unicast address */
2449 return;
2450 }
2451
b203ca39
JP		 2452 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2453 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2454 /* Not from the current AP or not associated yet. */
fea14732
JM		 2455 return;
2456 }
2457
2458 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2459 /* Too short SA Query request frame */
2460 return;
2461 }
2462
2463 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2464 if (skb == NULL)
2465 return;
2466
2467 skb_reserve(skb, local->hw.extra_tx_headroom);
2468 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2469 memset(resp, 0, 24);
2470 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2471 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2472 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2473 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2474 IEEE80211_STYPE_ACTION);
2475 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2476 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2477 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2478 memcpy(resp->u.action.u.sa_query.trans_id,
2479 mgmt->u.action.u.sa_query.trans_id,
2480 WLAN_SA_QUERY_TR_ID_LEN);
2481
62ae67be 2482 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2483}
2484
2e161f78
JB		 2485static ieee80211_rx_result debug_noinline
2486ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2487{
2488 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2489 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2490
2491 /*
2492 * From here on, look only at management frames.
2493 * Data and control frames are already handled,
2494 * and unknown (reserved) frames are useless.
2495 */
2496 if (rx->skb->len < 24)
2497 return RX_DROP_MONITOR;
2498
2499 if (!ieee80211_is_mgmt(mgmt->frame_control))
2500 return RX_DROP_MONITOR;
2501
ee971924
JB		 2502 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2503 ieee80211_is_beacon(mgmt->frame_control) &&
2504 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2505 int sig = 0;
2506
2507 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2508 sig = status->signal;
2509
ee971924
JB		 2510 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2511 rx->skb->data, rx->skb->len,
37c73b5f 2512 status->freq, sig);
ee971924
JB		 2513 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2514 }
2515
554891e6 2516 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2517 return RX_DROP_MONITOR;
2518
2519 if (ieee80211_drop_unencrypted_mgmt(rx))
2520 return RX_DROP_UNUSABLE;
2521
2522 return RX_CONTINUE;
2523}
2524
de1ede7a
JB		 2525static ieee80211_rx_result debug_noinline
2526ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2527{
2528 struct ieee80211_local *local = rx->local;
eb9fb5b8 2529 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2530 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2531 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2532 int len = rx->skb->len;
2533
2534 if (!ieee80211_is_action(mgmt->frame_control))
2535 return RX_CONTINUE;
2536
026331c4
JM		 2537 /* drop too small frames */
2538 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2539 return RX_DROP_UNUSABLE;
de1ede7a 2540
815b8092 2541 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2542 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2543 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2544 return RX_DROP_UNUSABLE;
de1ede7a 2545
554891e6 2546 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2547 return RX_DROP_UNUSABLE;
97ebe12a 2548
de1ede7a 2549 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2550 case WLAN_CATEGORY_HT:
2551 /* reject HT action frames from stations not supporting HT */
2552 if (!rx->sta->sta.ht_cap.ht_supported)
2553 goto invalid;
2554
2555 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2556 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2557 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2558 sdata->vif.type != NL80211_IFTYPE_AP &&
2559 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2560 break;
2561
ec61cd63 2562 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2563 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2564 goto invalid;
2565
2566 switch (mgmt->u.action.u.ht_smps.action) {
2567 case WLAN_HT_ACTION_SMPS: {
2568 struct ieee80211_supported_band *sband;
af0ed69b 2569 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2570
2571 /* convert to HT capability */
2572 switch (mgmt->u.action.u.ht_smps.smps_control) {
2573 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2574 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2575 break;
2576 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2577 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2578 break;
2579 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2580 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2581 break;
2582 default:
2583 goto invalid;
2584 }
1d8d3dec
JB		 2585
2586 /* if no change do nothing */
af0ed69b 2587 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2588 goto handled;
af0ed69b 2589 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2590
2591 sband = rx->local->hw.wiphy->bands[status->band];
2592
64f68e5d
JB		 2593 rate_control_rate_update(local, sband, rx->sta,
2594 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2595 goto handled;
2596 }
ec61cd63
JB		 2597 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2598 struct ieee80211_supported_band *sband;
2599 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2600 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2601
2602 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2603 if (!(rx->sta->sta.ht_cap.cap &
2604 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2605 goto handled;
2606
e1a0c6b3
JB		 2607 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2608 new_bw = IEEE80211_STA_RX_BW_20;
2609 else
2610 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2611
e1a0c6b3 2612 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2613 goto handled;
2614
ec61cd63
JB		 2615 sband = rx->local->hw.wiphy->bands[status->band];
2616
2617 rate_control_rate_update(local, sband, rx->sta,
2618 IEEE80211_RC_BW_CHANGED);
2619 goto handled;
2620 }
1d8d3dec
JB		 2621 default:
2622 goto invalid;
2623 }
2624
0af83d3d 2625 break;
1b3a2e49
JB		 2626 case WLAN_CATEGORY_PUBLIC:
2627 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2628 goto invalid;
2629 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2630 break;
2631 if (!rx->sta)
2632 break;
2633 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2634 break;
2635 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2636 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2637 break;
2638 if (len < offsetof(struct ieee80211_mgmt,
2639 u.action.u.ext_chan_switch.variable))
2640 goto invalid;
2641 goto queue;
0af83d3d
JB		 2642 case WLAN_CATEGORY_VHT:
2643 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2644 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2645 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2646 sdata->vif.type != NL80211_IFTYPE_AP &&
2647 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2648 break;
2649
2650 /* verify action code is present */
2651 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2652 goto invalid;
2653
2654 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2655 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2656 u8 opmode;
2657
2658 /* verify opmode is present */
2659 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2660 goto invalid;
2661
2662 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2663
2664 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2665 opmode, status->band,
2666 false);
0af83d3d
JB		 2667 goto handled;
2668 }
2669 default:
2670 break;
2671 }
1d8d3dec 2672 break;
de1ede7a 2673 case WLAN_CATEGORY_BACK:
8abd3f9b 2674 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2675 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2676 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2677 sdata->vif.type != NL80211_IFTYPE_AP &&
2678 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2679 break;
8abd3f9b 2680
026331c4
JM		 2681 /* verify action_code is present */
2682 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2683 break;
2684
de1ede7a
JB		 2685 switch (mgmt->u.action.u.addba_req.action_code) {
2686 case WLAN_ACTION_ADDBA_REQ:
2687 if (len < (IEEE80211_MIN_ACTION_SIZE +
2688 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2689 goto invalid;
2690 break;
de1ede7a
JB		 2691 case WLAN_ACTION_ADDBA_RESP:
2692 if (len < (IEEE80211_MIN_ACTION_SIZE +
2693 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2694 goto invalid;
2695 break;
de1ede7a
JB		 2696 case WLAN_ACTION_DELBA:
2697 if (len < (IEEE80211_MIN_ACTION_SIZE +
2698 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2699 goto invalid;
2700 break;
2701 default:
2702 goto invalid;
de1ede7a 2703 }
bed7ee6e 2704
8b58ff83 2705 goto queue;
39192c0b 2706 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2707 /* verify action_code is present */
2708 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2709 break;
2710
39192c0b
JB		 2711 switch (mgmt->u.action.u.measurement.action_code) {
2712 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2713 if (status->band != IEEE80211_BAND_5GHZ)
2714 break;
2715
39192c0b
JB		 2716 if (len < (IEEE80211_MIN_ACTION_SIZE +
2717 sizeof(mgmt->u.action.u.measurement)))
84040805 2718 break;
cd7760e6
SW		 2719
2720 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2721 break;
2722
39192c0b 2723 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2724 goto handled;
cd7760e6
SW		 2725 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2726 u8 *bssid;
2727 if (len < (IEEE80211_MIN_ACTION_SIZE +
2728 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2729 break;
cc32abd4 2730
cd7760e6 2731 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2732 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2733 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2734 break;
2735
2736 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2737 bssid = sdata->u.mgd.bssid;
2738 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2739 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2740 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2741 bssid = mgmt->sa;
cd7760e6
SW		 2742 else
2743 break;
2744
2745 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2746 break;
c481ec97 2747
8b58ff83 2748 goto queue;
cd7760e6 2749 }
39192c0b
JB		 2750 }
2751 break;
fea14732
JM		 2752 case WLAN_CATEGORY_SA_QUERY:
2753 if (len < (IEEE80211_MIN_ACTION_SIZE +
2754 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2755 break;
2756
fea14732
JM		 2757 switch (mgmt->u.action.u.sa_query.action) {
2758 case WLAN_ACTION_SA_QUERY_REQUEST:
2759 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2760 break;
fea14732 2761 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2762 goto handled;
fea14732
JM		 2763 }
2764 break;
8db09850 2765 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2766 if (len < (IEEE80211_MIN_ACTION_SIZE +
2767 sizeof(mgmt->u.action.u.self_prot.action_code)))
2768 break;
2769
8db09850
TP		 2770 switch (mgmt->u.action.u.self_prot.action_code) {
2771 case WLAN_SP_MESH_PEERING_OPEN:
2772 case WLAN_SP_MESH_PEERING_CLOSE:
2773 case WLAN_SP_MESH_PEERING_CONFIRM:
2774 if (!ieee80211_vif_is_mesh(&sdata->vif))
2775 goto invalid;
a6dad6a2 2776 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2777 /* userspace handles this frame */
2778 break;
2779 goto queue;
2780 case WLAN_SP_MGK_INFORM:
2781 case WLAN_SP_MGK_ACK:
2782 if (!ieee80211_vif_is_mesh(&sdata->vif))
2783 goto invalid;
2784 break;
2785 }
2786 break;
d3aaec8a 2787 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2788 if (len < (IEEE80211_MIN_ACTION_SIZE +
2789 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2790 break;
2791
77a121c3
JB		 2792 if (!ieee80211_vif_is_mesh(&sdata->vif))
2793 break;
25d49e4d 2794 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2795 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2796 break;
2797 goto queue;
84040805 2798 }
026331c4 2799
2e161f78
JB		 2800 return RX_CONTINUE;
2801
bed7ee6e 2802 invalid:
554891e6 2803 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2804 /* will return in the next handlers */
2805 return RX_CONTINUE;
2806
2807 handled:
2808 if (rx->sta)
2809 rx->sta->rx_packets++;
2810 dev_kfree_skb(rx->skb);
2811 return RX_QUEUED;
2812
2813 queue:
2814 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2815 skb_queue_tail(&sdata->skb_queue, rx->skb);
2816 ieee80211_queue_work(&local->hw, &sdata->work);
2817 if (rx->sta)
2818 rx->sta->rx_packets++;
2819 return RX_QUEUED;
2820}
2821
2822static ieee80211_rx_result debug_noinline
2823ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2824{
554891e6 2825 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2826 int sig = 0;
2e161f78
JB		 2827
2828 /* skip known-bad action frames and return them in the next handler */
554891e6 2829 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2830 return RX_CONTINUE;
d7907448 2831
026331c4
JM		 2832 /*
2833 * Getting here means the kernel doesn't know how to handle
2834 * it, but maybe userspace does ... include returned frames
2835 * so userspace can register for those to know whether ones
2836 * it transmitted were processed or returned.
2837 */
026331c4 2838
804483e9
JB		 2839 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2840 sig = status->signal;
2841
71bbc994 2842 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2843 rx->skb->data, rx->skb->len, 0)) {
2e161f78
JB		 2844 if (rx->sta)
2845 rx->sta->rx_packets++;
2846 dev_kfree_skb(rx->skb);
2847 return RX_QUEUED;
2848 }
2849
2e161f78
JB		 2850 return RX_CONTINUE;
2851}
2852
2853static ieee80211_rx_result debug_noinline
2854ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2855{
2856 struct ieee80211_local *local = rx->local;
2857 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2858 struct sk_buff *nskb;
2859 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2860 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2861
2862 if (!ieee80211_is_action(mgmt->frame_control))
2863 return RX_CONTINUE;
2864
2865 /*
2866 * For AP mode, hostapd is responsible for handling any action
2867 * frames that we didn't handle, including returning unknown
2868 * ones. For all other modes we will return them to the sender,
2869 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2870 * 802.11-2012 9.24.4.
2e161f78
JB		 2871 * Newer versions of hostapd shall also use the management frame
2872 * registration mechanisms, but older ones still use cooked
2873 * monitor interfaces so push all frames there.
2874 */
554891e6 2875 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2876 (sdata->vif.type == NL80211_IFTYPE_AP ||
2877 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2878 return RX_DROP_MONITOR;
026331c4 2879
4b5ebccc
JB		 2880 if (is_multicast_ether_addr(mgmt->da))
2881 return RX_DROP_MONITOR;
2882
84040805
JB		 2883 /* do not return rejected action frames */
2884 if (mgmt->u.action.category & 0x80)
2885 return RX_DROP_UNUSABLE;
2886
2887 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2888 GFP_ATOMIC);
2889 if (nskb) {
292b4df6 2890 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2891
292b4df6
JL		 2892 nmgmt->u.action.category |= 0x80;
2893 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2894 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2895
2896 memset(nskb->cb, 0, sizeof(nskb->cb));
2897
07e5a5f5
JB		 2898 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2899 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2900
2901 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2902 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2903 IEEE80211_TX_CTL_NO_CCK_RATE;
2904 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2905 info->hw_queue =
2906 local->hw.offchannel_tx_hw_queue;
2907 }
2908
2909 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2910 status->band);
de1ede7a 2911 }
39192c0b
JB		 2912 dev_kfree_skb(rx->skb);
2913 return RX_QUEUED;
de1ede7a
JB		 2914}
2915
49461622 2916static ieee80211_rx_result debug_noinline
5cf121c3 2917ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2918{
eb9fb5b8 2919 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2920 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2921 __le16 stype;
571ecf67 2922
77a121c3 2923 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2924
77a121c3
JB		 2925 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2926 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 2927 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 2928 sdata->vif.type != NL80211_IFTYPE_STATION)
2929 return RX_DROP_MONITOR;
472dbc45 2930
77a121c3 2931 switch (stype) {
66e67e41 2932 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2933 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2934 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2935 /* process for all: mesh, mlme, ibss */
2936 break;
66e67e41
JB		 2937 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2938 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2939 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2940 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2941 if (is_multicast_ether_addr(mgmt->da) &&
2942 !is_broadcast_ether_addr(mgmt->da))
2943 return RX_DROP_MONITOR;
2944
77a121c3
JB		 2945 /* process only for station */
2946 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2947 return RX_DROP_MONITOR;
2948 break;
2949 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2950 /* process only for ibss and mesh */
2951 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2952 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2953 return RX_DROP_MONITOR;
2954 break;
2955 default:
2956 return RX_DROP_MONITOR;
2957 }
f9d540ee 2958
77a121c3 2959 /* queue up frame and kick off work to process it */
c1475ca9 2960 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2961 skb_queue_tail(&sdata->skb_queue, rx->skb);
2962 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2963 if (rx->sta)
2964 rx->sta->rx_packets++;
46900298 2965
77a121c3 2966 return RX_QUEUED;
571ecf67
JB		 2967}
2968
5cf121c3 2969/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2970static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2971 struct ieee80211_rate *rate)
3d30d949
MW		 2972{
2973 struct ieee80211_sub_if_data *sdata;
2974 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2975 struct sk_buff *skb = rx->skb, *skb2;
2976 struct net_device *prev_dev = NULL;
eb9fb5b8 2977 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2978 int needed_headroom;
3d30d949 2979
554891e6
JB		 2980 /*
2981 * If cooked monitor has been processed already, then
2982 * don't do it again. If not, set the flag.
2983 */
2984 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2985 goto out_free_skb;
554891e6 2986 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2987
152c477a
JB		 2988 /* If there are no cooked monitor interfaces, just free the SKB */
2989 if (!local->cooked_mntrs)
2990 goto out_free_skb;
2991
1f7bba79
JB		 2992 /* vendor data is long removed here */
2993 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 2994 /* room for the radiotap header based on driver features */
1f7bba79 2995 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 2996
293702a3
JB		 2997 if (skb_headroom(skb) < needed_headroom &&
2998 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2999 goto out_free_skb;
3d30d949 3000
293702a3 3001 /* prepend radiotap information */
973ef21a
FF		 3002 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3003 false);
3d30d949
MW		 3004
3005 skb_set_mac_header(skb, 0);
3006 skb->ip_summed = CHECKSUM_UNNECESSARY;
3007 skb->pkt_type = PACKET_OTHERHOST;
3008 skb->protocol = htons(ETH_P_802_2);
3009
3010 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3011 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3012 continue;
3013
05c914fe 3014 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 3015 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3016 continue;
3017
3018 if (prev_dev) {
3019 skb2 = skb_clone(skb, GFP_ATOMIC);
3020 if (skb2) {
3021 skb2->dev = prev_dev;
5548a8a1 3022 netif_receive_skb(skb2);
3d30d949
MW		 3023 }
3024 }
3025
3026 prev_dev = sdata->dev;
3027 sdata->dev->stats.rx_packets++;
3028 sdata->dev->stats.rx_bytes += skb->len;
3029 }
3030
3031 if (prev_dev) {
3032 skb->dev = prev_dev;
5548a8a1 3033 netif_receive_skb(skb);
554891e6
JB		 3034 return;
3035 }
3d30d949
MW		 3036
3037 out_free_skb:
3038 dev_kfree_skb(skb);
3039}
3040
aa0c8636
CL		 3041static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3042 ieee80211_rx_result res)
3043{
3044 switch (res) {
3045 case RX_DROP_MONITOR:
3046 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3047 if (rx->sta)
3048 rx->sta->rx_dropped++;
3049 /* fall through */
3050 case RX_CONTINUE: {
3051 struct ieee80211_rate *rate = NULL;
3052 struct ieee80211_supported_band *sband;
3053 struct ieee80211_rx_status *status;
3054
3055 status = IEEE80211_SKB_RXCB((rx->skb));
3056
3057 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3058 if (!(status->flag & RX_FLAG_HT) &&
3059 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3060 rate = &sband->bitrates[status->rate_idx];
3061
3062 ieee80211_rx_cooked_monitor(rx, rate);
3063 break;
3064 }
3065 case RX_DROP_UNUSABLE:
3066 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3067 if (rx->sta)
3068 rx->sta->rx_dropped++;
3069 dev_kfree_skb(rx->skb);
3070 break;
3071 case RX_QUEUED:
3072 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3073 break;
3074 }
3075}
571ecf67 3076
f9e124fb
CL		 3077static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3078 struct sk_buff_head *frames)
58905290 3079{
58905290 3080 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3081 struct sk_buff *skb;
8944b79f 3082
e32f85f7
LCC		 3083#define CALL_RXH(rxh) \
3084 do { \
3085 res = rxh(rx); \
3086 if (res != RX_CONTINUE) \
2569a826 3087 goto rxh_next; \
e32f85f7 3088 } while (0);
49461622 3089
f9e124fb 3090 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3091
f9e124fb 3092 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3093 /*
3094 * all the other fields are valid across frames
3095 * that belong to an aMPDU since they are on the
3096 * same TID from the same station
3097 */
3098 rx->skb = skb;
3099
2569a826 3100 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 3101 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 3102 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 3103 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 3104 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 3105 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3106 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3107#ifdef CONFIG_MAC80211_MESH
aa0c8636 3108 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3109 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3110#endif
2154c81c 3111 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 3112 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 3113
3114 /* special treatment -- needs the queue */
3115 res = ieee80211_rx_h_ctrl(rx, frames);
3116 if (res != RX_CONTINUE)
3117 goto rxh_next;
3118
2e161f78 3119 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3120 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3121 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3122 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3123 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3124
aa0c8636
CL		 3125 rxh_next:
3126 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3127
49461622 3128#undef CALL_RXH
aa0c8636 3129 }
24a8fdad 3130
f9e124fb 3131 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3132}
3133
4406c376 3134static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3135{
f9e124fb 3136 struct sk_buff_head reorder_release;
aa0c8636
CL		 3137 ieee80211_rx_result res = RX_DROP_MONITOR;
3138
f9e124fb
CL		 3139 __skb_queue_head_init(&reorder_release);
3140
aa0c8636
CL		 3141#define CALL_RXH(rxh) \
3142 do { \
3143 res = rxh(rx); \
3144 if (res != RX_CONTINUE) \
3145 goto rxh_next; \
3146 } while (0);
3147
0395442a 3148 CALL_RXH(ieee80211_rx_h_check_dup)
aa0c8636
CL		 3149 CALL_RXH(ieee80211_rx_h_check)
3150
f9e124fb 3151 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3152
f9e124fb 3153 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3154 return;
49461622 3155
2569a826 3156 rxh_next:
aa0c8636
CL		 3157 ieee80211_rx_handlers_result(rx, res);
3158
3159#undef CALL_RXH
58905290
JB		 3160}
3161
2bff8ebf 3162/*
dd318575
JB		 3163 * This function makes calls into the RX path, therefore
3164 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3165 */
3166void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3167{
f9e124fb 3168 struct sk_buff_head frames;
554891e6
JB		 3169 struct ieee80211_rx_data rx = {
3170 .sta = sta,
3171 .sdata = sta->sdata,
3172 .local = sta->local,
9e26297a
JB		 3173 /* This is OK -- must be QoS data frame */
3174 .security_idx = tid,
3175 .seqno_idx = tid,
fcf8bd3b 3176 .flags = 0,
554891e6 3177 };
2c15a0cf
CL		 3178 struct tid_ampdu_rx *tid_agg_rx;
3179
3180 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3181 if (!tid_agg_rx)
3182 return;
2bff8ebf 3183
f9e124fb
CL		 3184 __skb_queue_head_init(&frames);
3185
2c15a0cf 3186 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3187 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3188 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3189
f9e124fb 3190 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3191}
3192
571ecf67
JB		 3193/* main receive path */
3194
3c2723f5
JB		 3195static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3196 struct ieee80211_hdr *hdr)
23a24def 3197{
20b01f80 3198 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3199 struct sk_buff *skb = rx->skb;
3200 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3201 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3202 int multicast = is_multicast_ether_addr(hdr->addr1);
3203
51fb61e7 3204 switch (sdata->vif.type) {
05c914fe 3205 case NL80211_IFTYPE_STATION:
9bc383de 3206 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3207 return false;
77fdaa12 3208 if (!multicast &&
b203ca39 3209 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3210 if (!(sdata->dev->flags & IFF_PROMISC) ||
3211 sdata->u.mgd.use_4addr)
3c2723f5 3212 return false;
554891e6 3213 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3214 }
3215 break;
05c914fe 3216 case NL80211_IFTYPE_ADHOC:
23a24def 3217 if (!bssid)
3c2723f5 3218 return false;
6329b8d9
FF		 3219 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3220 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3221 return false;
a7767f95 3222 if (ieee80211_is_beacon(hdr->frame_control)) {
3c2723f5 3223 return true;
d48b2968 3224 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3c2723f5 3225 return false;
23a24def 3226 } else if (!multicast &&
b203ca39 3227 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3228 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3229 return false;
554891e6 3230 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3231 } else if (!rx->sta) {
3232 int rate_idx;
5614618e
JB		 3233 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3234 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3235 else
eb9fb5b8 3236 rate_idx = status->rate_idx;
8bf11d8d
JB		 3237 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3238 BIT(rate_idx));
0fb8ca45 3239 }
23a24def 3240 break;
239281f8
RL		 3241 case NL80211_IFTYPE_OCB:
3242 if (!bssid)
3243 return false;
3244 if (ieee80211_is_beacon(hdr->frame_control)) {
3245 return false;
3246 } else if (!is_broadcast_ether_addr(bssid)) {
3247 ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3248 return false;
3249 } else if (!multicast &&
3250 !ether_addr_equal(sdata->dev->dev_addr,
3251 hdr->addr1)) {
3252 /* if we are in promisc mode we also accept
3253 * packets not destined for us
3254 */
3255 if (!(sdata->dev->flags & IFF_PROMISC))
3256 return false;
3257 rx->flags &= ~IEEE80211_RX_RA_MATCH;
3258 } else if (!rx->sta) {
3259 int rate_idx;
3260 if (status->flag & RX_FLAG_HT)
3261 rate_idx = 0; /* TODO: HT rates */
3262 else
3263 rate_idx = status->rate_idx;
3264 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3265 BIT(rate_idx));
3266 }
3267 break;
05c914fe 3268 case NL80211_IFTYPE_MESH_POINT:
6032f934 3269 if (!multicast &&
b203ca39 3270 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934 3271 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3272 return false;
6032f934 3273
554891e6 3274 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3275 }
3276 break;
05c914fe
JB		 3277 case NL80211_IFTYPE_AP_VLAN:
3278 case NL80211_IFTYPE_AP:
23a24def 3279 if (!bssid) {
b203ca39 3280 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3281 return false;
f142c6b9 3282 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3283 /*
3284 * Accept public action frames even when the
3285 * BSSID doesn't match, this is used for P2P
3286 * and location updates. Note that mac80211
3287 * itself never looks at these frames.
3288 */
2b9ccd4e
JB		 3289 if (!multicast &&
3290 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3291 return false;
d48b2968 3292 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3293 return true;
d48b2968 3294 if (!ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3295 return false;
554891e6 3296 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
db8e1732
AN		 3297 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3298 /* ignore data frames to TDLS-peers */
3299 if (ieee80211_is_data(hdr->frame_control))
3300 return false;
3301 /* ignore action frames to TDLS-peers */
3302 if (ieee80211_is_action(hdr->frame_control) &&
3303 !ether_addr_equal(bssid, hdr->addr1))
3304 return false;
23a24def 3305 }
23a24def 3306 break;
05c914fe 3307 case NL80211_IFTYPE_WDS:
a7767f95 3308 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3309 return false;
b203ca39 3310 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3c2723f5 3311 return false;
23a24def 3312 break;
f142c6b9
JB		 3313 case NL80211_IFTYPE_P2P_DEVICE:
3314 if (!ieee80211_is_public_action(hdr, skb->len) &&
3315 !ieee80211_is_probe_req(hdr->frame_control) &&
3316 !ieee80211_is_probe_resp(hdr->frame_control) &&
3317 !ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3318 return false;
1b737f88
JB		 3319 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3320 !multicast)
f142c6b9
JB		 3321 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3322 break;
2ca27bcf 3323 default:
fb1c1cd6 3324 /* should never get here */
f142c6b9 3325 WARN_ON_ONCE(1);
fb1c1cd6 3326 break;
23a24def
JB		 3327 }
3328
3c2723f5 3329 return true;
23a24def
JB		 3330}
3331
4406c376
JB		 3332/*
3333 * This function returns whether or not the SKB
3334 * was destined for RX processing or not, which,
3335 * if consume is true, is equivalent to whether
3336 * or not the skb was consumed.
3337 */
3338static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3339 struct sk_buff *skb, bool consume)
3340{
3341 struct ieee80211_local *local = rx->local;
3342 struct ieee80211_sub_if_data *sdata = rx->sdata;
3343 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3344 struct ieee80211_hdr *hdr = (void *)skb->data;
4406c376
JB		 3345
3346 rx->skb = skb;
554891e6 3347 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376 3348
40791942 3349 if (!prepare_for_handlers(rx, hdr))
4406c376
JB		 3350 return false;
3351
4406c376
JB		 3352 if (!consume) {
3353 skb = skb_copy(skb, GFP_ATOMIC);
3354 if (!skb) {
3355 if (net_ratelimit())
3356 wiphy_debug(local->hw.wiphy,
b305dae4 3357 "failed to copy skb for %s\n",
4406c376
JB		 3358 sdata->name);
3359 return true;
3360 }
3361
3362 rx->skb = skb;
3363 }
3364
3365 ieee80211_invoke_rx_handlers(rx);
3366 return true;
3367}
3368
571ecf67 3369/*
6b59db7d 3370 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3371 * be called with rcu_read_lock protection.
571ecf67 3372 */
71ebb4aa 3373static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3374 struct sk_buff *skb)
571ecf67
JB		 3375{
3376 struct ieee80211_local *local = hw_to_local(hw);
3377 struct ieee80211_sub_if_data *sdata;
571ecf67 3378 struct ieee80211_hdr *hdr;
e3cf8b3f 3379 __le16 fc;
5cf121c3 3380 struct ieee80211_rx_data rx;
4406c376 3381 struct ieee80211_sub_if_data *prev;
56af3268 3382 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3383 int err = 0;
571ecf67 3384
e3cf8b3f 3385 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3386 memset(&rx, 0, sizeof(rx));
3387 rx.skb = skb;
3388 rx.local = local;
72abd81b 3389
e3cf8b3f 3390 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3391 local->dot11ReceivedFragmentCount++;
571ecf67 3392
4a4f1a58
JB		 3393 if (ieee80211_is_mgmt(fc)) {
3394 /* drop frame if too short for header */
3395 if (skb->len < ieee80211_hdrlen(fc))
3396 err = -ENOBUFS;
3397 else
3398 err = skb_linearize(skb);
3399 } else {
e3cf8b3f 3400 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3401 }
e3cf8b3f
ZY		 3402
3403 if (err) {
3404 dev_kfree_skb(skb);
3405 return;
3406 }
3407
3408 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3409 ieee80211_parse_qos(&rx);
d1c3a37c 3410 ieee80211_verify_alignment(&rx);
38f3714d 3411
d48b2968
JB		 3412 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3413 ieee80211_is_beacon(hdr->frame_control)))
3414 ieee80211_scan_rx(local, skb);
3415
e3cf8b3f 3416 if (ieee80211_is_data(fc)) {
56af3268 3417 prev_sta = NULL;
4406c376 3418
7852e361 3419 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3420 if (!prev_sta) {
3421 prev_sta = sta;
3422 continue;
3423 }
3424
3425 rx.sta = prev_sta;
3426 rx.sdata = prev_sta->sdata;
4406c376 3427 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3428
56af3268 3429 prev_sta = sta;
4406c376 3430 }
56af3268
BG		 3431
3432 if (prev_sta) {
3433 rx.sta = prev_sta;
3434 rx.sdata = prev_sta->sdata;
3435
4406c376 3436 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3437 return;
8e26d5ad 3438 goto out;
56af3268 3439 }
4406c376
JB		 3440 }
3441
4b0dd98e 3442 prev = NULL;
b2e7771e 3443
4b0dd98e
JB		 3444 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3445 if (!ieee80211_sdata_running(sdata))
3446 continue;
340e11f3 3447
4b0dd98e
JB		 3448 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3449 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3450 continue;
340e11f3 3451
4b0dd98e
JB		 3452 /*
3453 * frame is destined for this interface, but if it's
3454 * not also for the previous one we handle that after
3455 * the loop to avoid copying the SKB once too much
3456 */
4bb29f8c 3457
4b0dd98e 3458 if (!prev) {
abe60632 3459 prev = sdata;
4b0dd98e 3460 continue;
340e11f3 3461 }
4bb29f8c 3462
7852e361 3463 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3464 rx.sdata = prev;
3465 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3466
4b0dd98e
JB		 3467 prev = sdata;
3468 }
3469
3470 if (prev) {
7852e361 3471 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3472 rx.sdata = prev;
4406c376 3473
4b0dd98e
JB		 3474 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3475 return;
571ecf67 3476 }
4406c376 3477
8e26d5ad 3478 out:
4406c376 3479 dev_kfree_skb(skb);
571ecf67 3480}
6368e4b1
RR		 3481
3482/*
3483 * This is the receive path handler. It is called by a low level driver when an
3484 * 802.11 MPDU is received from the hardware.
3485 */
103bf9f7 3486void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3487{
3488 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3489 struct ieee80211_rate *rate = NULL;
3490 struct ieee80211_supported_band *sband;
f1d58c25 3491 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3492
d20ef63d
JB		 3493 WARN_ON_ONCE(softirq_count() == 0);
3494
444e3803 3495 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3496 goto drop;
8318d78a
JB		 3497
3498 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3499 if (WARN_ON(!sband))
3500 goto drop;
8318d78a 3501
89c3a8ac
JB		 3502 /*
3503 * If we're suspending, it is possible although not too likely
3504 * that we'd be receiving frames after having already partially
3505 * quiesced the stack. We can't process such frames then since
3506 * that might, for example, cause stations to be added or other
3507 * driver callbacks be invoked.
3508 */
77a980dc
JB		 3509 if (unlikely(local->quiescing || local->suspended))
3510 goto drop;
89c3a8ac 3511
04800ada
AN		 3512 /* We might be during a HW reconfig, prevent Rx for the same reason */
3513 if (unlikely(local->in_reconfig))
3514 goto drop;
3515
ea77f12f
JB		 3516 /*
3517 * The same happens when we're not even started,
3518 * but that's worth a warning.
3519 */
77a980dc
JB		 3520 if (WARN_ON(!local->started))
3521 goto drop;
ea77f12f 3522
fc885189 3523 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3524 /*
fc885189
JB		 3525 * Validate the rate, unless a PLCP error means that
3526 * we probably can't have a valid rate here anyway.
e5d6eb83 3527 */
fc885189
JB		 3528
3529 if (status->flag & RX_FLAG_HT) {
3530 /*
3531 * rate_idx is MCS index, which can be [0-76]
3532 * as documented on:
3533 *
3534 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3535 *
3536 * Anything else would be some sort of driver or
3537 * hardware error. The driver should catch hardware
3538 * errors.
3539 */
444e3803 3540 if (WARN(status->rate_idx > 76,
fc885189
JB		 3541 "Rate marked as an HT rate but passed "
3542 "status->rate_idx is not "
3543 "an MCS index [0-76]: %d (0x%02x)\n",
3544 status->rate_idx,
3545 status->rate_idx))
3546 goto drop;
5614618e
JB		 3547 } else if (status->flag & RX_FLAG_VHT) {
3548 if (WARN_ONCE(status->rate_idx > 9 ||
3549 !status->vht_nss ||
3550 status->vht_nss > 8,
3551 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3552 status->rate_idx, status->vht_nss))
3553 goto drop;
fc885189 3554 } else {
444e3803 3555 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3556 goto drop;
3557 rate = &sband->bitrates[status->rate_idx];
3558 }
0fb8ca45 3559 }
6368e4b1 3560
554891e6
JB		 3561 status->rx_flags = 0;
3562
6368e4b1
RR		 3563 /*
3564 * key references and virtual interfaces are protected using RCU
3565 * and this requires that we are in a read-side RCU section during
3566 * receive processing
3567 */
3568 rcu_read_lock();
3569
3570 /*
3571 * Frames with failed FCS/PLCP checksum are not returned,
3572 * all other frames are returned without radiotap header
3573 * if it was previously present.
3574 * Also, frames with less than 16 bytes are dropped.
3575 */
f1d58c25 3576 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3577 if (!skb) {
3578 rcu_read_unlock();
3579 return;
3580 }
3581
e1e54068
JB		 3582 ieee80211_tpt_led_trig_rx(local,
3583 ((struct ieee80211_hdr *)skb->data)->frame_control,
3584 skb->len);
071d9ac2 3585 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3586
3587 rcu_read_unlock();
77a980dc
JB		 3588
3589 return;
3590 drop:
3591 kfree_skb(skb);
6368e4b1 3592}
103bf9f7 3593EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3594
3595/* This is a version of the rx handler that can be called from hard irq
3596 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3597void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3598{
3599 struct ieee80211_local *local = hw_to_local(hw);
3600
3601 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3602
571ecf67
JB		 3603 skb->pkt_type = IEEE80211_RX_MSG;
3604 skb_queue_tail(&local->skb_queue, skb);
3605 tasklet_schedule(&local->tasklet);
3606}
3607EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)