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mac80211: remove support for IFF_PROMISC
[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)
3a5c5e81 275 channel_flags |= IEEE80211_CHAN_CCK | 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);
51648921
JB		 364 put_unaligned_le16(known, pos);
365 pos += 2;
366 /* flags */
367 if (status->flag & RX_FLAG_SHORT_GI)
368 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 369 /* in VHT, STBC is binary */
370 if (status->flag & RX_FLAG_STBC_MASK)
371 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 372 if (status->vht_flag & RX_VHT_FLAG_BF)
373 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 374 pos++;
375 /* bandwidth */
1b8d242a 376 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 377 *pos++ = 4;
1b8d242a 378 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 379 *pos++ = 11;
380 else if (status->flag & RX_FLAG_40MHZ)
381 *pos++ = 1;
382 else /* 20 MHz */
383 *pos++ = 0;
384 /* MCS/NSS */
385 *pos = (status->rate_idx << 4) | status->vht_nss;
386 pos += 4;
387 /* coding field */
63c361f5
EG		 388 if (status->flag & RX_FLAG_LDPC)
389 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 390 pos++;
391 /* group ID */
392 pos++;
393 /* partial_aid */
394 pos += 2;
395 }
396
a144f378
JB		 397 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
398 *pos++ = status->chain_signal[chain];
399 *pos++ = chain;
400 }
1f7bba79
JB		 401
402 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
403 /* ensure 2 byte alignment for the vendor field as required */
404 if ((pos - (u8 *)rthdr) & 1)
405 *pos++ = 0;
406 *pos++ = rtap.oui[0];
407 *pos++ = rtap.oui[1];
408 *pos++ = rtap.oui[2];
409 *pos++ = rtap.subns;
410 put_unaligned_le16(rtap.len, pos);
411 pos += 2;
412 /* align the actual payload as requested */
413 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
414 *pos++ = 0;
415 /* data (and possible padding) already follows */
416 }
601ae7f2
BR		 417}
418
b2e7771e
JB		 419/*
420 * This function copies a received frame to all monitor interfaces and
421 * returns a cleaned-up SKB that no longer includes the FCS nor the
422 * radiotap header the driver might have added.
423 */
424static struct sk_buff *
425ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 426 struct ieee80211_rate *rate)
b2e7771e 427{
f1d58c25 428 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 429 struct ieee80211_sub_if_data *sdata;
1f7bba79 430 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 431 struct sk_buff *skb, *skb2;
432 struct net_device *prev_dev = NULL;
433 int present_fcs_len = 0;
1f7bba79
JB		 434 unsigned int rtap_vendor_space = 0;
435
436 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
437 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
438
439 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
440 }
b2e7771e
JB		 441
442 /*
443 * First, we may need to make a copy of the skb because
444 * (1) we need to modify it for radiotap (if not present), and
445 * (2) the other RX handlers will modify the skb we got.
446 *
447 * We don't need to, of course, if we aren't going to return
448 * the SKB because it has a bad FCS/PLCP checksum.
449 */
0869aea0 450
b2e7771e
JB		 451 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
452 present_fcs_len = FCS_LEN;
453
1f7bba79
JB		 454 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
455 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 456 dev_kfree_skb(origskb);
457 return NULL;
458 }
459
b2e7771e 460 if (!local->monitors) {
1f7bba79
JB		 461 if (should_drop_frame(origskb, present_fcs_len,
462 rtap_vendor_space)) {
b2e7771e
JB		 463 dev_kfree_skb(origskb);
464 return NULL;
465 }
466
1f7bba79 467 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 468 }
469
751413ea 470 /* room for the radiotap header based on driver features */
1f7bba79
JB		 471 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
472 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 473
1f7bba79 474 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 475 /* only need to expand headroom if necessary */
476 skb = origskb;
477 origskb = NULL;
478
479 /*
480 * This shouldn't trigger often because most devices have an
481 * RX header they pull before we get here, and that should
482 * be big enough for our radiotap information. We should
483 * probably export the length to drivers so that we can have
484 * them allocate enough headroom to start with.
485 */
486 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 487 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 488 dev_kfree_skb(skb);
489 return NULL;
490 }
491 } else {
492 /*
493 * Need to make a copy and possibly remove radiotap header
494 * and FCS from the original.
495 */
496 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
497
1f7bba79
JB		 498 origskb = remove_monitor_info(local, origskb,
499 rtap_vendor_space);
b2e7771e
JB		 500
501 if (!skb)
502 return origskb;
503 }
504
0869aea0 505 /* prepend radiotap information */
1f7bba79 506 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 507
ce3edf6d 508 skb_reset_mac_header(skb);
b2e7771e
JB		 509 skb->ip_summed = CHECKSUM_UNNECESSARY;
510 skb->pkt_type = PACKET_OTHERHOST;
511 skb->protocol = htons(ETH_P_802_2);
512
513 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 514 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 515 continue;
516
3d30d949
MW		 517 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
518 continue;
519
9607e6b6 520 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 521 continue;
522
b2e7771e
JB		 523 if (prev_dev) {
524 skb2 = skb_clone(skb, GFP_ATOMIC);
525 if (skb2) {
526 skb2->dev = prev_dev;
5548a8a1 527 netif_receive_skb(skb2);
b2e7771e
JB		 528 }
529 }
530
531 prev_dev = sdata->dev;
532 sdata->dev->stats.rx_packets++;
533 sdata->dev->stats.rx_bytes += skb->len;
534 }
535
536 if (prev_dev) {
537 skb->dev = prev_dev;
5548a8a1 538 netif_receive_skb(skb);
b2e7771e
JB		 539 } else
540 dev_kfree_skb(skb);
541
542 return origskb;
543}
544
5cf121c3 545static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 546{
238f74a2 547 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 548 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 549 int tid, seqno_idx, security_idx;
6e0d114d
JB		 550
551 /* does the frame have a qos control field? */
238f74a2
HH		 552 if (ieee80211_is_data_qos(hdr->frame_control)) {
553 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 554 /* frame has qos control */
238f74a2 555 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 556 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 557 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 558
559 seqno_idx = tid;
560 security_idx = tid;
6e0d114d 561 } else {
1411f9b5
JB		 562 /*
563 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
564 *
565 * Sequence numbers for management frames, QoS data
566 * frames with a broadcast/multicast address in the
567 * Address 1 field, and all non-QoS data frames sent
568 * by QoS STAs are assigned using an additional single
569 * modulo-4096 counter, [...]
570 *
571 * We also use that counter for non-QoS STAs.
572 */
5a306f58 573 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 574 security_idx = 0;
575 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 576 security_idx = IEEE80211_NUM_TIDS;
9e26297a 577 tid = 0;
6e0d114d 578 }
52865dfd 579
9e26297a
JB		 580 rx->seqno_idx = seqno_idx;
581 rx->security_idx = security_idx;
6e0d114d
JB		 582 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
583 * For now, set skb->priority to 0 for other cases. */
584 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 585}
6e0d114d 586
d1c3a37c
JB		 587/**
588 * DOC: Packet alignment
589 *
590 * Drivers always need to pass packets that are aligned to two-byte boundaries
591 * to the stack.
592 *
593 * Additionally, should, if possible, align the payload data in a way that
594 * guarantees that the contained IP header is aligned to a four-byte
595 * boundary. In the case of regular frames, this simply means aligning the
596 * payload to a four-byte boundary (because either the IP header is directly
597 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 598 * in front of it). If the payload data is not properly aligned and the
599 * architecture doesn't support efficient unaligned operations, mac80211
600 * will align the data.
d1c3a37c
JB		 601 *
602 * With A-MSDU frames, however, the payload data address must yield two modulo
603 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
604 * push the IP header further back to a multiple of four again. Thankfully, the
605 * specs were sane enough this time around to require padding each A-MSDU
606 * subframe to a length that is a multiple of four.
607 *
25985edc 608 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 609 * the payload is not supported, the driver is required to move the 802.11
610 * header to be directly in front of the payload in that case.
611 */
612static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 613{
59d9cb07
KV		 614#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
615 WARN_ONCE((unsigned long)rx->skb->data & 1,
616 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 617#endif
6e0d114d
JB		 618}
619
6368e4b1 620
571ecf67
JB		 621/* rx handlers */
622
3cfcf6ac
JM		 623static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
624{
625 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
626
d8ca16db 627 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 628 return 0;
629
d8ca16db 630 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 631}
632
633
634static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
635{
636 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
637
d8ca16db 638 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 639 return 0;
640
d8ca16db 641 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 642}
643
644
645/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
646static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
647{
648 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
649 struct ieee80211_mmie *mmie;
56c52da2 650 struct ieee80211_mmie_16 *mmie16;
3cfcf6ac 651
1df332e8 652 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 653 return -1;
654
d8ca16db 655 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 656 return -1; /* not a robust management frame */
657
658 mmie = (struct ieee80211_mmie *)
659 (skb->data + skb->len - sizeof(*mmie));
56c52da2
JM		 660 if (mmie->element_id == WLAN_EID_MMIE &&
661 mmie->length == sizeof(*mmie) - 2)
662 return le16_to_cpu(mmie->key_id);
663
664 mmie16 = (struct ieee80211_mmie_16 *)
665 (skb->data + skb->len - sizeof(*mmie16));
666 if (skb->len >= 24 + sizeof(*mmie16) &&
667 mmie16->element_id == WLAN_EID_MMIE &&
668 mmie16->length == sizeof(*mmie16) - 2)
669 return le16_to_cpu(mmie16->key_id);
670
671 return -1;
3cfcf6ac
JM		 672}
673
2475b1cc
MS		 674static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
675 struct sk_buff *skb)
676{
677 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
678 __le16 fc;
679 int hdrlen;
680 u8 keyid;
681
682 fc = hdr->frame_control;
683 hdrlen = ieee80211_hdrlen(fc);
684
685 if (skb->len < hdrlen + cs->hdr_len)
686 return -EINVAL;
687
688 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
689 keyid &= cs->key_idx_mask;
690 keyid >>= cs->key_idx_shift;
691
692 return keyid;
693}
694
1df332e8 695static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 696{
a7767f95 697 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 698 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 699
a7767f95 700 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 701 if (is_multicast_ether_addr(hdr->addr1)) {
702 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 703 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 704 return RX_DROP_MONITOR;
b203ca39 705 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 706 return RX_DROP_MONITOR;
707 } else {
708 if (!ieee80211_has_a4(hdr->frame_control))
709 return RX_DROP_MONITOR;
b203ca39 710 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 711 return RX_DROP_MONITOR;
712 }
33b64eb2
LCC		 713 }
714
715 /* If there is not an established peer link and this is not a peer link
716 * establisment frame, beacon or probe, drop the frame.
717 */
718
57cf8043 719 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 720 struct ieee80211_mgmt *mgmt;
d6d1a5a7 721
a7767f95 722 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 723 return RX_DROP_MONITOR;
724
a7767f95 725 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 726 u8 category;
9b395bc3
JB		 727
728 /* make sure category field is present */
729 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
730 return RX_DROP_MONITOR;
731
33b64eb2 732 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 733 category = mgmt->u.action.category;
734 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 735 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 736 return RX_DROP_MONITOR;
33b64eb2 737 return RX_CONTINUE;
33b64eb2
LCC		 738 }
739
a7767f95
HH		 740 if (ieee80211_is_probe_req(hdr->frame_control) ||
741 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 742 ieee80211_is_beacon(hdr->frame_control) ||
743 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 744 return RX_CONTINUE;
745
746 return RX_DROP_MONITOR;
a7767f95
HH		 747 }
748
902acc78
JB		 749 return RX_CONTINUE;
750}
33b64eb2 751
d3b2fb53 752static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 753 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 754 int index,
755 struct sk_buff_head *frames)
1edfb1af 756{
83eb935e
MK		 757 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
758 struct sk_buff *skb;
4cfda47b 759 struct ieee80211_rx_status *status;
1edfb1af 760
dd318575
JB		 761 lockdep_assert_held(&tid_agg_rx->reorder_lock);
762
83eb935e 763 if (skb_queue_empty(skb_list))
1edfb1af
JB		 764 goto no_frame;
765
83eb935e
MK		 766 if (!ieee80211_rx_reorder_ready(skb_list)) {
767 __skb_queue_purge(skb_list);
768 goto no_frame;
769 }
770
771 /* release frames from the reorder ring buffer */
1edfb1af 772 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 773 while ((skb = __skb_dequeue(skb_list))) {
774 status = IEEE80211_SKB_RXCB(skb);
775 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
776 __skb_queue_tail(frames, skb);
777 }
1edfb1af
JB		 778
779no_frame:
9a886586 780 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 781}
782
d3b2fb53 783static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 784 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 785 u16 head_seq_num,
786 struct sk_buff_head *frames)
1edfb1af
JB		 787{
788 int index;
789
dd318575
JB		 790 lockdep_assert_held(&tid_agg_rx->reorder_lock);
791
9a886586 792 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 793 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 794 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
795 frames);
1edfb1af
JB		 796 }
797}
798
799/*
800 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
801 * the skb was added to the buffer longer than this time ago, the earlier
802 * frames that have not yet been received are assumed to be lost and the skb
803 * can be released for processing. This may also release other skb's from the
804 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 805 *
806 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 807 */
808#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
809
d3b2fb53 810static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 811 struct tid_ampdu_rx *tid_agg_rx,
812 struct sk_buff_head *frames)
aa0c8636 813{
83eb935e 814 int index, i, j;
aa0c8636 815
dd318575
JB		 816 lockdep_assert_held(&tid_agg_rx->reorder_lock);
817
aa0c8636 818 /* release the buffer until next missing frame */
2e3049b7 819 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
83eb935e 820 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
07ae2dfc 821 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 822 /*
823 * No buffers ready to be released, but check whether any
824 * frames in the reorder buffer have timed out.
825 */
aa0c8636
CL		 826 int skipped = 1;
827 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
828 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 829 if (!ieee80211_rx_reorder_ready(
830 &tid_agg_rx->reorder_buf[j])) {
aa0c8636
CL		 831 skipped++;
832 continue;
833 }
499fe9a4
DH		 834 if (skipped &&
835 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 836 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 837 goto set_release_timer;
aa0c8636 838
83eb935e
MK		 839 /* don't leave incomplete A-MSDUs around */
840 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
841 i = (i + 1) % tid_agg_rx->buf_size)
842 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
843
bdcbd8e0
JB		 844 ht_dbg_ratelimited(sdata,
845 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 846 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
847 frames);
aa0c8636
CL		 848
849 /*
850 * Increment the head seq# also for the skipped slots.
851 */
852 tid_agg_rx->head_seq_num =
9a886586
JB		 853 (tid_agg_rx->head_seq_num +
854 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 855 skipped = 0;
856 }
83eb935e
MK		 857 } else while (ieee80211_rx_reorder_ready(
858 &tid_agg_rx->reorder_buf[index])) {
f9e124fb
CL		 859 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
860 frames);
2e3049b7 861 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 862 }
2bff8ebf
CL		 863
864 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 865 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 866
867 for (; j != (index - 1) % tid_agg_rx->buf_size;
868 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 869 if (ieee80211_rx_reorder_ready(
870 &tid_agg_rx->reorder_buf[j]))
2bff8ebf
CL		 871 break;
872 }
873
874 set_release_timer:
875
788211d8
JB		 876 if (!tid_agg_rx->removed)
877 mod_timer(&tid_agg_rx->reorder_timer,
878 tid_agg_rx->reorder_time[j] + 1 +
879 HT_RX_REORDER_BUF_TIMEOUT);
2bff8ebf
CL		 880 } else {
881 del_timer(&tid_agg_rx->reorder_timer);
882 }
aa0c8636
CL		 883}
884
1edfb1af
JB		 885/*
886 * As this function belongs to the RX path it must be under
887 * rcu_read_lock protection. It returns false if the frame
888 * can be processed immediately, true if it was consumed.
889 */
d3b2fb53 890static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 891 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 892 struct sk_buff *skb,
893 struct sk_buff_head *frames)
1edfb1af
JB		 894{
895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 896 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 897 u16 sc = le16_to_cpu(hdr->seq_ctrl);
898 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
899 u16 head_seq_num, buf_size;
900 int index;
2bff8ebf 901 bool ret = true;
1edfb1af 902
dd318575
JB		 903 spin_lock(&tid_agg_rx->reorder_lock);
904
4549cf2b
MK		 905 /*
906 * Offloaded BA sessions have no known starting sequence number so pick
907 * one from first Rxed frame for this tid after BA was started.
908 */
909 if (unlikely(tid_agg_rx->auto_seq)) {
910 tid_agg_rx->auto_seq = false;
911 tid_agg_rx->ssn = mpdu_seq_num;
912 tid_agg_rx->head_seq_num = mpdu_seq_num;
913 }
914
1edfb1af
JB		 915 buf_size = tid_agg_rx->buf_size;
916 head_seq_num = tid_agg_rx->head_seq_num;
917
918 /* frame with out of date sequence number */
9a886586 919 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 920 dev_kfree_skb(skb);
2bff8ebf 921 goto out;
1edfb1af
JB		 922 }
923
924 /*
925 * If frame the sequence number exceeds our buffering window
926 * size release some previous frames to make room for this one.
927 */
9a886586
JB		 928 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
929 head_seq_num = ieee80211_sn_inc(
930 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 931 /* release stored frames up to new head to stack */
d3b2fb53 932 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 933 head_seq_num, frames);
1edfb1af
JB		 934 }
935
936 /* Now the new frame is always in the range of the reordering buffer */
937
2e3049b7 938 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 939
940 /* check if we already stored this frame */
83eb935e 941 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
1edfb1af 942 dev_kfree_skb(skb);
2bff8ebf 943 goto out;
1edfb1af
JB		 944 }
945
946 /*
947 * If the current MPDU is in the right order and nothing else
948 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 949 * If it is first but there's something stored, we may be able
950 * to release frames after this one.
1edfb1af
JB		 951 */
952 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
953 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 954 if (!(status->flag & RX_FLAG_AMSDU_MORE))
955 tid_agg_rx->head_seq_num =
956 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 957 ret = false;
958 goto out;
1edfb1af
JB		 959 }
960
961 /* put the frame in the reordering buffer */
83eb935e
MK		 962 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
963 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
964 tid_agg_rx->reorder_time[index] = jiffies;
965 tid_agg_rx->stored_mpdu_num++;
966 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
967 }
1edfb1af 968
2bff8ebf
CL		 969 out:
970 spin_unlock(&tid_agg_rx->reorder_lock);
971 return ret;
1edfb1af
JB		 972}
973
974/*
975 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
976 * true if the MPDU was buffered, false if it should be processed.
977 */
f9e124fb
CL		 978static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
979 struct sk_buff_head *frames)
1edfb1af 980{
2569a826
JB		 981 struct sk_buff *skb = rx->skb;
982 struct ieee80211_local *local = rx->local;
1edfb1af 983 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 984 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 985 struct sta_info *sta = rx->sta;
1edfb1af
JB		 986 struct tid_ampdu_rx *tid_agg_rx;
987 u16 sc;
6cc00d54 988 u8 tid, ack_policy;
1edfb1af 989
051a41fa
JB		 990 if (!ieee80211_is_data_qos(hdr->frame_control) ||
991 is_multicast_ether_addr(hdr->addr1))
2569a826 992 goto dont_reorder;
1edfb1af
JB		 993
994 /*
995 * filter the QoS data rx stream according to
996 * STA/TID and check if this STA/TID is on aggregation
997 */
998
1edfb1af 999 if (!sta)
2569a826 1000 goto dont_reorder;
1edfb1af 1001
6cc00d54
TP		 1002 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1003 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1004 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1005
a87f736d
JB		 1006 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1007 if (!tid_agg_rx)
1008 goto dont_reorder;
1edfb1af
JB		 1009
1010 /* qos null data frames are excluded */
1011 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1012 goto dont_reorder;
1edfb1af 1013
6cc00d54
TP		 1014 /* not part of a BA session */
1015 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1016 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1017 goto dont_reorder;
1018
660c6a44
TP		 1019 /* not actually part of this BA session */
1020 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1021 goto dont_reorder;
1022
1edfb1af
JB		 1023 /* new, potentially un-ordered, ampdu frame - process it */
1024
1025 /* reset session timer */
1026 if (tid_agg_rx->timeout)
12d3952f 1027 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1028
1029 /* if this mpdu is fragmented - terminate rx aggregation session */
1030 sc = le16_to_cpu(hdr->seq_ctrl);
1031 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1032 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1033 skb_queue_tail(&rx->sdata->skb_queue, skb);
1034 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1035 return;
1edfb1af
JB		 1036 }
1037
a87f736d
JB		 1038 /*
1039 * No locking needed -- we will only ever process one
1040 * RX packet at a time, and thus own tid_agg_rx. All
1041 * other code manipulating it needs to (and does) make
1042 * sure that we cannot get to it any more before doing
1043 * anything with it.
1044 */
f9e124fb
CL		 1045 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1046 frames))
2569a826
JB		 1047 return;
1048
1049 dont_reorder:
f9e124fb 1050 __skb_queue_tail(frames, skb);
1edfb1af 1051}
33b64eb2 1052
49461622 1053static ieee80211_rx_result debug_noinline
0395442a 1054ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
571ecf67 1055{
a7767f95 1056 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1057 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1058
6b0f3274
JB		 1059 /*
1060 * Drop duplicate 802.11 retransmissions
1061 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1062 */
0395442a
JB		 1063
1064 if (rx->skb->len < 24)
1065 return RX_CONTINUE;
1066
1067 if (ieee80211_is_ctl(hdr->frame_control) ||
1068 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1069 is_multicast_ether_addr(hdr->addr1))
1070 return RX_CONTINUE;
1071
1072 if (rx->sta) {
a7767f95 1073 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 1074 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 1075 hdr->seq_ctrl)) {
554891e6 1076 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 1077 rx->local->dot11FrameDuplicateCount++;
1078 rx->sta->num_duplicates++;
1079 }
b1f93314 1080 return RX_DROP_UNUSABLE;
0cfcefef 1081 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
9e26297a 1082 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
0cfcefef 1083 }
571ecf67
JB		 1084 }
1085
0395442a
JB		 1086 return RX_CONTINUE;
1087}
1088
1089static ieee80211_rx_result debug_noinline
1090ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1091{
1092 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1093
571ecf67
JB		 1094 if (unlikely(rx->skb->len < 16)) {
1095 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 1096 return RX_DROP_MONITOR;
571ecf67
JB		 1097 }
1098
571ecf67
JB		 1099 /* Drop disallowed frame classes based on STA auth/assoc state;
1100 * IEEE 802.11, Chap 5.5.
1101 *
ccd7b362
JB		 1102 * mac80211 filters only based on association state, i.e. it drops
1103 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1104 * deauth/disassoc frames when needed. In addition, hostapd is
1105 * responsible for filtering on both auth and assoc states.
1106 */
33b64eb2 1107
902acc78 1108 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1109 return ieee80211_rx_mesh_check(rx);
33b64eb2 1110
a7767f95
HH		 1111 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1112 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1113 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1114 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1115 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1116 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1117 /*
1118 * accept port control frames from the AP even when it's not
1119 * yet marked ASSOC to prevent a race where we don't set the
1120 * assoc bit quickly enough before it sends the first frame
1121 */
1122 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1123 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1124 unsigned int hdrlen;
1125 __be16 ethertype;
1126
1127 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1128
1129 if (rx->skb->len < hdrlen + 8)
1130 return RX_DROP_MONITOR;
1131
1132 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1133 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1134 return RX_CONTINUE;
1135 }
21fc7560
JB		 1136
1137 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1138 cfg80211_rx_spurious_frame(rx->sdata->dev,
1139 hdr->addr2,
1140 GFP_ATOMIC))
1141 return RX_DROP_UNUSABLE;
1142
e4c26add 1143 return RX_DROP_MONITOR;
2a33bee2 1144 }
571ecf67 1145
9ae54c84 1146 return RX_CONTINUE;
570bd537
JB		 1147}
1148
1149
572e0012
KV		 1150static ieee80211_rx_result debug_noinline
1151ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1152{
1153 struct ieee80211_local *local;
1154 struct ieee80211_hdr *hdr;
1155 struct sk_buff *skb;
1156
1157 local = rx->local;
1158 skb = rx->skb;
1159 hdr = (struct ieee80211_hdr *) skb->data;
1160
1161 if (!local->pspolling)
1162 return RX_CONTINUE;
1163
1164 if (!ieee80211_has_fromds(hdr->frame_control))
1165 /* this is not from AP */
1166 return RX_CONTINUE;
1167
1168 if (!ieee80211_is_data(hdr->frame_control))
1169 return RX_CONTINUE;
1170
1171 if (!ieee80211_has_moredata(hdr->frame_control)) {
1172 /* AP has no more frames buffered for us */
1173 local->pspolling = false;
1174 return RX_CONTINUE;
1175 }
1176
1177 /* more data bit is set, let's request a new frame from the AP */
1178 ieee80211_send_pspoll(local, rx->sdata);
1179
1180 return RX_CONTINUE;
1181}
1182
d012a605 1183static void sta_ps_start(struct sta_info *sta)
571ecf67 1184{
133b8226 1185 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1186 struct ieee80211_local *local = sdata->local;
d012a605 1187 struct ps_data *ps;
ba8c3d6f 1188 int tid;
0795af57 1189
d012a605
MP		 1190 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1191 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1192 ps = &sdata->bss->ps;
1193 else
1194 return;
1195
1196 atomic_inc(&ps->num_sta_ps);
c2c98fde 1197 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1198 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1199 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1200 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1201 sta->sta.addr, sta->sta.aid);
ba8c3d6f 1202
17c18bf8
JB		 1203 ieee80211_clear_fast_xmit(sta);
1204
ba8c3d6f
FF		 1205 if (!sta->sta.txq[0])
1206 return;
1207
1208 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1209 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1210
1211 if (!skb_queue_len(&txqi->queue))
1212 set_bit(tid, &sta->txq_buffered_tids);
1213 else
1214 clear_bit(tid, &sta->txq_buffered_tids);
1215 }
571ecf67
JB		 1216}
1217
d012a605 1218static void sta_ps_end(struct sta_info *sta)
571ecf67 1219{
bdcbd8e0
JB		 1220 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1221 sta->sta.addr, sta->sta.aid);
004c872e 1222
c2c98fde 1223 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1224 /*
1225 * Clear the flag only if the other one is still set
1226 * so that the TX path won't start TX'ing new frames
1227 * directly ... In the case that the driver flag isn't
1228 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1229 */
1230 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1231 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1232 sta->sta.addr, sta->sta.aid);
af818581
JB		 1233 return;
1234 }
1235
5ac2e350
JB		 1236 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1237 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1238 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1239}
1240
d057e5a3
AN		 1241int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1242{
1243 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1244 bool in_ps;
1245
1246 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1247
1248 /* Don't let the same PS state be set twice */
c2c98fde 1249 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1250 if ((start && in_ps) || (!start && !in_ps))
1251 return -EINVAL;
1252
1253 if (start)
d012a605 1254 sta_ps_start(sta_inf);
d057e5a3 1255 else
d012a605 1256 sta_ps_end(sta_inf);
d057e5a3
AN		 1257
1258 return 0;
1259}
1260EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1261
47086fc5
JB		 1262static ieee80211_rx_result debug_noinline
1263ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1264{
1265 struct ieee80211_sub_if_data *sdata = rx->sdata;
1266 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1267 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1268 int tid, ac;
1269
1270 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1271 return RX_CONTINUE;
1272
1273 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1274 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1275 return RX_CONTINUE;
1276
1277 /*
1278 * The device handles station powersave, so don't do anything about
1279 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1280 * it to mac80211 since they're handled.)
1281 */
1282 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1283 return RX_CONTINUE;
1284
1285 /*
1286 * Don't do anything if the station isn't already asleep. In
1287 * the uAPSD case, the station will probably be marked asleep,
1288 * in the PS-Poll case the station must be confused ...
1289 */
c2c98fde 1290 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1291 return RX_CONTINUE;
1292
1293 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1294 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1295 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1296 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1297 else
c2c98fde 1298 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1299 }
47086fc5
JB		 1300
1301 /* Free PS Poll skb here instead of returning RX_DROP that would
1302 * count as an dropped frame. */
1303 dev_kfree_skb(rx->skb);
1304
1305 return RX_QUEUED;
1306 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1307 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1308 ieee80211_has_pm(hdr->frame_control) &&
1309 (ieee80211_is_data_qos(hdr->frame_control) ||
1310 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1311 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1312 ac = ieee802_1d_to_ac[tid & 7];
1313
1314 /*
1315 * If this AC is not trigger-enabled do nothing.
1316 *
1317 * NB: This could/should check a separate bitmap of trigger-
1318 * enabled queues, but for now we only implement uAPSD w/o
1319 * TSPEC changes to the ACs, so they're always the same.
1320 */
1321 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1322 return RX_CONTINUE;
1323
1324 /* if we are in a service period, do nothing */
c2c98fde 1325 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1326 return RX_CONTINUE;
1327
c2c98fde 1328 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1329 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1330 else
c2c98fde 1331 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1332 }
1333
1334 return RX_CONTINUE;
1335}
1336
49461622 1337static ieee80211_rx_result debug_noinline
5cf121c3 1338ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1339{
1340 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1341 struct sk_buff *skb = rx->skb;
1342 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1343 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1344 int i;
571ecf67
JB		 1345
1346 if (!sta)
9ae54c84 1347 return RX_CONTINUE;
571ecf67 1348
b291ba11
JB		 1349 /*
1350 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1351 * BSSID and for station already AUTHORIZED to avoid keeping the
1352 * current IBSS network alive in cases where other STAs start
1353 * using different BSSID. This will also give the station another
1354 * chance to restart the authentication/authorization in case
1355 * something went wrong the first time.
b291ba11 1356 */
05c914fe 1357 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1358 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1359 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1360 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1361 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1362 sta->last_rx = jiffies;
f4ebddf9
HR		 1363 if (ieee80211_is_data(hdr->frame_control) &&
1364 !is_multicast_ether_addr(hdr->addr1)) {
3af6334c
FF		 1365 sta->last_rx_rate_idx = status->rate_idx;
1366 sta->last_rx_rate_flag = status->flag;
1b8d242a 1367 sta->last_rx_rate_vht_flag = status->vht_flag;
5614618e 1368 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1369 }
1370 }
239281f8
RL		 1371 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1372 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1373 NL80211_IFTYPE_OCB);
1374 /* OCB uses wild-card BSSID */
1375 if (is_broadcast_ether_addr(bssid))
1376 sta->last_rx = jiffies;
b291ba11
JB		 1377 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1378 /*
33b64eb2
LCC		 1379 * Mesh beacons will update last_rx when if they are found to
1380 * match the current local configuration when processed.
571ecf67 1381 */
b291ba11 1382 sta->last_rx = jiffies;
3af6334c
FF		 1383 if (ieee80211_is_data(hdr->frame_control)) {
1384 sta->last_rx_rate_idx = status->rate_idx;
1385 sta->last_rx_rate_flag = status->flag;
b8ff416b 1386 sta->last_rx_rate_vht_flag = status->vht_flag;
5614618e 1387 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1388 }
571ecf67
JB		 1389 }
1390
554891e6 1391 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1392 return RX_CONTINUE;
571ecf67 1393
3cf335d5
KV		 1394 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1395 ieee80211_sta_rx_notify(rx->sdata, hdr);
1396
571ecf67
JB		 1397 sta->rx_fragments++;
1398 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1399 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1400 sta->last_signal = status->signal;
1401 ewma_add(&sta->avg_signal, -status->signal);
1402 }
571ecf67 1403
ef0621e8
FF		 1404 if (status->chains) {
1405 sta->chains = status->chains;
1406 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1407 int signal = status->chain_signal[i];
1408
1409 if (!(status->chains & BIT(i)))
1410 continue;
1411
1412 sta->chain_signal_last[i] = signal;
1413 ewma_add(&sta->chain_signal_avg[i], -signal);
1414 }
1415 }
1416
72eaa43a
JB		 1417 /*
1418 * Change STA power saving mode only at the end of a frame
1419 * exchange sequence.
1420 */
d057e5a3
AN		 1421 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1422 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1423 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1424 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1425 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1426 /* PM bit is only checked in frames where it isn't reserved,
1427 * in AP mode it's reserved in non-bufferable management frames
1428 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1429 */
1430 (!ieee80211_is_mgmt(hdr->frame_control) ||
1431 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1432 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1433 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1434 sta_ps_end(sta);
72eaa43a
JB		 1435 } else {
1436 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1437 sta_ps_start(sta);
72eaa43a 1438 }
571ecf67
JB		 1439 }
1440
3f52b7e3
MP		 1441 /* mesh power save support */
1442 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1443 ieee80211_mps_rx_h_sta_process(sta, hdr);
1444
22403def
JB		 1445 /*
1446 * Drop (qos-)data::nullfunc frames silently, since they
1447 * are used only to control station power saving mode.
1448 */
1449 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1450 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1451 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1452
1453 /*
1454 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1455 * that was not moved to a 4-addr STA vlan yet send
1456 * the event to userspace and for older hostapd drop
1457 * the frame to the monitor interface.
d524215f
FF		 1458 */
1459 if (ieee80211_has_a4(hdr->frame_control) &&
1460 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1461 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1462 !rx->sdata->u.vlan.sta))) {
1463 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1464 cfg80211_rx_unexpected_4addr_frame(
1465 rx->sdata->dev, sta->sta.addr,
1466 GFP_ATOMIC);
d524215f 1467 return RX_DROP_MONITOR;
e7f4a940 1468 }
22403def
JB		 1469 /*
1470 * Update counter and free packet here to avoid
1471 * counting this as a dropped packed.
1472 */
571ecf67
JB		 1473 sta->rx_packets++;
1474 dev_kfree_skb(rx->skb);
9ae54c84 1475 return RX_QUEUED;
571ecf67
JB		 1476 }
1477
9ae54c84 1478 return RX_CONTINUE;
571ecf67
JB		 1479} /* ieee80211_rx_h_sta_process */
1480
86c228a7
JA		 1481static ieee80211_rx_result debug_noinline
1482ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1483{
1484 struct sk_buff *skb = rx->skb;
1485 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1487 int keyidx;
1488 int hdrlen;
1489 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1490 struct ieee80211_key *sta_ptk = NULL;
1491 int mmie_keyidx = -1;
1492 __le16 fc;
2475b1cc 1493 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1494
1495 /*
1496 * Key selection 101
1497 *
1498 * There are four types of keys:
1499 * - GTK (group keys)
1500 * - IGTK (group keys for management frames)
1501 * - PTK (pairwise keys)
1502 * - STK (station-to-station pairwise keys)
1503 *
1504 * When selecting a key, we have to distinguish between multicast
1505 * (including broadcast) and unicast frames, the latter can only
1506 * use PTKs and STKs while the former always use GTKs and IGTKs.
1507 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1508 * unicast frames can also use key indices like GTKs. Hence, if we
1509 * don't have a PTK/STK we check the key index for a WEP key.
1510 *
1511 * Note that in a regular BSS, multicast frames are sent by the
1512 * AP only, associated stations unicast the frame to the AP first
1513 * which then multicasts it on their behalf.
1514 *
1515 * There is also a slight problem in IBSS mode: GTKs are negotiated
1516 * with each station, that is something we don't currently handle.
1517 * The spec seems to expect that one negotiates the same key with
1518 * every station but there's no such requirement; VLANs could be
1519 * possible.
1520 */
1521
1522 /*
1523 * No point in finding a key and decrypting if the frame is neither
1524 * addressed to us nor a multicast frame.
1525 */
1526 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1527 return RX_CONTINUE;
1528
1529 /* start without a key */
1530 rx->key = NULL;
2475b1cc 1531 fc = hdr->frame_control;
86c228a7 1532
2475b1cc
MS		 1533 if (rx->sta) {
1534 int keyid = rx->sta->ptk_idx;
86c228a7 1535
2475b1cc
MS		 1536 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1537 cs = rx->sta->cipher_scheme;
1538 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1539 if (unlikely(keyid < 0))
1540 return RX_DROP_UNUSABLE;
1541 }
1542 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1543 }
86c228a7
JA		 1544
1545 if (!ieee80211_has_protected(fc))
1546 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1547
1548 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1549 rx->key = sta_ptk;
1550 if ((status->flag & RX_FLAG_DECRYPTED) &&
1551 (status->flag & RX_FLAG_IV_STRIPPED))
1552 return RX_CONTINUE;
1553 /* Skip decryption if the frame is not protected. */
1554 if (!ieee80211_has_protected(fc))
1555 return RX_CONTINUE;
1556 } else if (mmie_keyidx >= 0) {
1557 /* Broadcast/multicast robust management frame / BIP */
1558 if ((status->flag & RX_FLAG_DECRYPTED) &&
1559 (status->flag & RX_FLAG_IV_STRIPPED))
1560 return RX_CONTINUE;
1561
1562 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1563 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1564 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1565 if (rx->sta)
1566 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1567 if (!rx->key)
1568 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1569 } else if (!ieee80211_has_protected(fc)) {
1570 /*
1571 * The frame was not protected, so skip decryption. However, we
1572 * need to set rx->key if there is a key that could have been
1573 * used so that the frame may be dropped if encryption would
1574 * have been expected.
1575 */
1576 struct ieee80211_key *key = NULL;
1577 struct ieee80211_sub_if_data *sdata = rx->sdata;
1578 int i;
1579
1580 if (ieee80211_is_mgmt(fc) &&
1581 is_multicast_ether_addr(hdr->addr1) &&
1582 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1583 rx->key = key;
1584 else {
1585 if (rx->sta) {
1586 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1587 key = rcu_dereference(rx->sta->gtk[i]);
1588 if (key)
1589 break;
1590 }
1591 }
1592 if (!key) {
1593 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1594 key = rcu_dereference(sdata->keys[i]);
1595 if (key)
1596 break;
1597 }
1598 }
1599 if (key)
1600 rx->key = key;
1601 }
1602 return RX_CONTINUE;
1603 } else {
1604 u8 keyid;
2475b1cc 1605
86c228a7
JA		 1606 /*
1607 * The device doesn't give us the IV so we won't be
1608 * able to look up the key. That's ok though, we
1609 * don't need to decrypt the frame, we just won't
1610 * be able to keep statistics accurate.
1611 * Except for key threshold notifications, should
1612 * we somehow allow the driver to tell us which key
1613 * the hardware used if this flag is set?
1614 */
1615 if ((status->flag & RX_FLAG_DECRYPTED) &&
1616 (status->flag & RX_FLAG_IV_STRIPPED))
1617 return RX_CONTINUE;
1618
1619 hdrlen = ieee80211_hdrlen(fc);
1620
2475b1cc
MS		 1621 if (cs) {
1622 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1623
2475b1cc
MS		 1624 if (unlikely(keyidx < 0))
1625 return RX_DROP_UNUSABLE;
1626 } else {
1627 if (rx->skb->len < 8 + hdrlen)
1628 return RX_DROP_UNUSABLE; /* TODO: count this? */
1629 /*
1630 * no need to call ieee80211_wep_get_keyidx,
1631 * it verifies a bunch of things we've done already
1632 */
1633 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1634 keyidx = keyid >> 6;
1635 }
86c228a7
JA		 1636
1637 /* check per-station GTK first, if multicast packet */
1638 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1639 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1640
1641 /* if not found, try default key */
1642 if (!rx->key) {
1643 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1644
1645 /*
1646 * RSNA-protected unicast frames should always be
1647 * sent with pairwise or station-to-station keys,
1648 * but for WEP we allow using a key index as well.
1649 */
1650 if (rx->key &&
1651 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1652 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1653 !is_multicast_ether_addr(hdr->addr1))
1654 rx->key = NULL;
1655 }
1656 }
1657
1658 if (rx->key) {
1659 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1660 return RX_DROP_MONITOR;
1661
1662 rx->key->tx_rx_count++;
1663 /* TODO: add threshold stuff again */
1664 } else {
1665 return RX_DROP_MONITOR;
1666 }
1667
1668 switch (rx->key->conf.cipher) {
1669 case WLAN_CIPHER_SUITE_WEP40:
1670 case WLAN_CIPHER_SUITE_WEP104:
1671 result = ieee80211_crypto_wep_decrypt(rx);
1672 break;
1673 case WLAN_CIPHER_SUITE_TKIP:
1674 result = ieee80211_crypto_tkip_decrypt(rx);
1675 break;
1676 case WLAN_CIPHER_SUITE_CCMP:
2b2ba0db
JM		 1677 result = ieee80211_crypto_ccmp_decrypt(
1678 rx, IEEE80211_CCMP_MIC_LEN);
1679 break;
1680 case WLAN_CIPHER_SUITE_CCMP_256:
1681 result = ieee80211_crypto_ccmp_decrypt(
1682 rx, IEEE80211_CCMP_256_MIC_LEN);
86c228a7
JA		 1683 break;
1684 case WLAN_CIPHER_SUITE_AES_CMAC:
1685 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1686 break;
56c52da2
JM		 1687 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1688 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1689 break;
8ade538b
JM		 1690 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1691 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1692 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1693 break;
00b9cfa3
JM		 1694 case WLAN_CIPHER_SUITE_GCMP:
1695 case WLAN_CIPHER_SUITE_GCMP_256:
1696 result = ieee80211_crypto_gcmp_decrypt(rx);
1697 break;
86c228a7 1698 default:
2475b1cc 1699 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1700 }
1701
1702 /* the hdr variable is invalid after the decrypt handlers */
1703
1704 /* either the frame has been decrypted or will be dropped */
1705 status->flag |= RX_FLAG_DECRYPTED;
1706
1707 return result;
1708}
1709
571ecf67
JB		 1710static inline struct ieee80211_fragment_entry *
1711ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1712 unsigned int frag, unsigned int seq, int rx_queue,
1713 struct sk_buff **skb)
1714{
1715 struct ieee80211_fragment_entry *entry;
571ecf67 1716
571ecf67
JB		 1717 entry = &sdata->fragments[sdata->fragment_next++];
1718 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1719 sdata->fragment_next = 0;
1720
bdcbd8e0 1721 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1722 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1723
1724 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1725 *skb = NULL;
1726 entry->first_frag_time = jiffies;
1727 entry->seq = seq;
1728 entry->rx_queue = rx_queue;
1729 entry->last_frag = frag;
1730 entry->ccmp = 0;
1731 entry->extra_len = 0;
1732
1733 return entry;
1734}
1735
1736static inline struct ieee80211_fragment_entry *
1737ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1738 unsigned int frag, unsigned int seq,
571ecf67
JB		 1739 int rx_queue, struct ieee80211_hdr *hdr)
1740{
1741 struct ieee80211_fragment_entry *entry;
1742 int i, idx;
1743
1744 idx = sdata->fragment_next;
1745 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1746 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1747
1748 idx--;
1749 if (idx < 0)
1750 idx = IEEE80211_FRAGMENT_MAX - 1;
1751
1752 entry = &sdata->fragments[idx];
1753 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1754 entry->rx_queue != rx_queue ||
1755 entry->last_frag + 1 != frag)
1756 continue;
1757
b73d70ad 1758 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1759
b73d70ad
HH		 1760 /*
1761 * Check ftype and addresses are equal, else check next fragment
1762 */
1763 if (((hdr->frame_control ^ f_hdr->frame_control) &
1764 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1765 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1766 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1767 continue;
1768
ab46623e 1769 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1770 __skb_queue_purge(&entry->skb_list);
1771 continue;
1772 }
1773 return entry;
1774 }
1775
1776 return NULL;
1777}
1778
49461622 1779static ieee80211_rx_result debug_noinline
5cf121c3 1780ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1781{
1782 struct ieee80211_hdr *hdr;
1783 u16 sc;
358c8d9d 1784 __le16 fc;
571ecf67
JB		 1785 unsigned int frag, seq;
1786 struct ieee80211_fragment_entry *entry;
1787 struct sk_buff *skb;
554891e6 1788 struct ieee80211_rx_status *status;
571ecf67 1789
b73d70ad 1790 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1791 fc = hdr->frame_control;
f7fbf70e
JC		 1792
1793 if (ieee80211_is_ctl(fc))
1794 return RX_CONTINUE;
1795
571ecf67
JB		 1796 sc = le16_to_cpu(hdr->seq_ctrl);
1797 frag = sc & IEEE80211_SCTL_FRAG;
1798
b8fff407
JB		 1799 if (is_multicast_ether_addr(hdr->addr1)) {
1800 rx->local->dot11MulticastReceivedFrameCount++;
d025933e 1801 goto out_no_led;
571ecf67 1802 }
b8fff407 1803
d025933e
AM		 1804 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1805 goto out;
1806
571ecf67
JB		 1807 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1808
e3cf8b3f
ZY		 1809 if (skb_linearize(rx->skb))
1810 return RX_DROP_UNUSABLE;
1811
058897a4
AK		 1812 /*
1813 * skb_linearize() might change the skb->data and
1814 * previously cached variables (in this case, hdr) need to
1815 * be refreshed with the new data.
1816 */
1817 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1818 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1819
1820 if (frag == 0) {
1821 /* This is the first fragment of a new frame. */
1822 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1823 rx->seqno_idx, &(rx->skb));
2b2ba0db
JM		 1824 if (rx->key &&
1825 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1826 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
358c8d9d 1827 ieee80211_has_protected(fc)) {
9e26297a 1828 int queue = rx->security_idx;
571ecf67
JB		 1829 /* Store CCMP PN so that we can verify that the next
1830 * fragment has a sequential PN value. */
1831 entry->ccmp = 1;
1832 memcpy(entry->last_pn,
9190252c 1833 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1834 IEEE80211_CCMP_PN_LEN);
571ecf67 1835 }
9ae54c84 1836 return RX_QUEUED;
571ecf67
JB		 1837 }
1838
1839 /* This is a fragment for a frame that should already be pending in
1840 * fragment cache. Add this fragment to the end of the pending entry.
1841 */
9e26297a
JB		 1842 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1843 rx->seqno_idx, hdr);
571ecf67
JB		 1844 if (!entry) {
1845 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1846 return RX_DROP_MONITOR;
571ecf67
JB		 1847 }
1848
1849 /* Verify that MPDUs within one MSDU have sequential PN values.
1850 * (IEEE 802.11i, 8.3.3.4.5) */
1851 if (entry->ccmp) {
1852 int i;
4325f6ca 1853 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1854 int queue;
2b2ba0db
JM		 1855 if (!rx->key ||
1856 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1857 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
e4c26add 1858 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1859 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1860 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1861 pn[i]++;
1862 if (pn[i])
1863 break;
1864 }
9e26297a 1865 queue = rx->security_idx;
9190252c 1866 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1867 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1868 return RX_DROP_UNUSABLE;
4325f6ca 1869 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1870 }
1871
358c8d9d 1872 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1873 __skb_queue_tail(&entry->skb_list, rx->skb);
1874 entry->last_frag = frag;
1875 entry->extra_len += rx->skb->len;
358c8d9d 1876 if (ieee80211_has_morefrags(fc)) {
571ecf67 1877 rx->skb = NULL;
9ae54c84 1878 return RX_QUEUED;
571ecf67
JB		 1879 }
1880
1881 rx->skb = __skb_dequeue(&entry->skb_list);
1882 if (skb_tailroom(rx->skb) < entry->extra_len) {
1883 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1884 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1885 GFP_ATOMIC))) {
1886 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1887 __skb_queue_purge(&entry->skb_list);
e4c26add 1888 return RX_DROP_UNUSABLE;
571ecf67
JB		 1889 }
1890 }
1891 while ((skb = __skb_dequeue(&entry->skb_list))) {
1892 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1893 dev_kfree_skb(skb);
1894 }
1895
1896 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1897 status = IEEE80211_SKB_RXCB(rx->skb);
1898 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1899
1900 out:
d025933e
AM		 1901 ieee80211_led_rx(rx->local);
1902 out_no_led:
571ecf67
JB		 1903 if (rx->sta)
1904 rx->sta->rx_packets++;
9ae54c84 1905 return RX_CONTINUE;
571ecf67
JB		 1906}
1907
1df332e8 1908static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1909{
1df332e8 1910 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1911 return -EACCES;
571ecf67 1912
76ee65bf 1913 return 0;
571ecf67
JB		 1914}
1915
1df332e8 1916static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1917{
eb9fb5b8
JB		 1918 struct sk_buff *skb = rx->skb;
1919 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1920
3017b80b 1921 /*
7848ba7d
JB		 1922 * Pass through unencrypted frames if the hardware has
1923 * decrypted them already.
3017b80b 1924 */
eb9fb5b8 1925 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1926 return 0;
571ecf67
JB		 1927
1928 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1929 if (unlikely(!ieee80211_has_protected(fc) &&
1930 !ieee80211_is_nullfunc(fc) &&
e8f4fb7c 1931 ieee80211_is_data(fc) && rx->key))
76ee65bf 1932 return -EACCES;
bef5d1c7
JB		 1933
1934 return 0;
1935}
1936
1df332e8 1937static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1938{
1939 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1940 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1941 __le16 fc = hdr->frame_control;
bef5d1c7 1942
e3efca0a
JM		 1943 /*
1944 * Pass through unencrypted frames if the hardware has
1945 * decrypted them already.
1946 */
1947 if (status->flag & RX_FLAG_DECRYPTED)
1948 return 0;
bef5d1c7 1949
c2c98fde 1950 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1951 if (unlikely(!ieee80211_has_protected(fc) &&
1952 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1953 rx->key)) {
6ff57cf8
JB		 1954 if (ieee80211_is_deauth(fc) ||
1955 ieee80211_is_disassoc(fc))
1956 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1957 rx->skb->data,
1958 rx->skb->len);
f2ca3ea4 1959 return -EACCES;
cf4e594e 1960 }
f2ca3ea4 1961 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1962 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1963 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1964 if (ieee80211_is_deauth(fc) ||
1965 ieee80211_is_disassoc(fc))
1966 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1967 rx->skb->data,
1968 rx->skb->len);
f2ca3ea4 1969 return -EACCES;
cf4e594e 1970 }
f2ca3ea4
JM		 1971 /*
1972 * When using MFP, Action frames are not allowed prior to
1973 * having configured keys.
1974 */
1975 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 1976 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 1977 return -EACCES;
1978 }
b3fc9c6c 1979
76ee65bf 1980 return 0;
571ecf67
JB		 1981}
1982
76ee65bf 1983static int
4114fa21 1984__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1985{
eb9fb5b8 1986 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1987 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1988 bool check_port_control = false;
1989 struct ethhdr *ehdr;
1990 int ret;
f14543ee 1991
4114fa21 1992 *port_control = false;
9bc383de
JB		 1993 if (ieee80211_has_a4(hdr->frame_control) &&
1994 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1995 return -1;
9bc383de 1996
fbb327c5
FF		 1997 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1998 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1999
2000 if (!sdata->u.mgd.use_4addr)
2001 return -1;
2002 else
2003 check_port_control = true;
2004 }
2005
9bc383de 2006 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 2007 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 2008 return -1;
571ecf67 2009
fbb327c5 2010 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 2011 if (ret < 0)
fbb327c5
FF		 2012 return ret;
2013
2014 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 2015 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2016 *port_control = true;
2017 else if (check_port_control)
fbb327c5
FF		 2018 return -1;
2019
2020 return 0;
76ee65bf 2021}
571ecf67 2022
ce3edf6d
JB		 2023/*
2024 * requires that rx->skb is a frame with ethernet header
2025 */
358c8d9d 2026static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 2027{
c97c23e3 2028 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 2029 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2030 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2031
2032 /*
2033 * Allow EAPOL frames to us/the PAE group address regardless
2034 * of whether the frame was encrypted or not.
2035 */
a621fa4d 2036 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 2037 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2038 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 2039 return true;
2040
2041 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 2042 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 2043 return false;
2044
2045 return true;
2046}
2047
2048/*
2049 * requires that rx->skb is a frame with ethernet header
2050 */
76ee65bf 2051static void
5cf121c3 2052ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2053{
eb9fb5b8
JB		 2054 struct ieee80211_sub_if_data *sdata = rx->sdata;
2055 struct net_device *dev = sdata->dev;
76ee65bf 2056 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2057 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2058 struct sta_info *dsta;
554891e6 2059 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 2060
4cc0dba9
JB		 2061 dev->stats.rx_packets++;
2062 dev->stats.rx_bytes += rx->skb->len;
2063
76ee65bf
RR		 2064 skb = rx->skb;
2065 xmit_skb = NULL;
571ecf67 2066
05c914fe
JB		 2067 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2068 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2069 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 2070 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 2071 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2072 if (is_multicast_ether_addr(ehdr->h_dest)) {
2073 /*
2074 * send multicast frames both to higher layers in
2075 * local net stack and back to the wireless medium
2076 */
76ee65bf 2077 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2078 if (!xmit_skb)
bdcbd8e0 2079 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2080 dev->name);
571ecf67 2081 } else {
abe60632
JB		 2082 dsta = sta_info_get(sdata, skb->data);
2083 if (dsta) {
ce3edf6d
JB		 2084 /*
2085 * The destination station is associated to
2086 * this AP (in this VLAN), so send the frame
2087 * directly to it and do not pass it to local
2088 * net stack.
571ecf67 2089 */
76ee65bf 2090 xmit_skb = skb;
571ecf67
JB		 2091 skb = NULL;
2092 }
571ecf67
JB		 2093 }
2094 }
2095
59d9cb07 2096#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2097 if (skb) {
2098 /* 'align' will only take the values 0 or 2 here since all
2099 * frames are required to be aligned to 2-byte boundaries
2100 * when being passed to mac80211; the code here works just
2101 * as well if that isn't true, but mac80211 assumes it can
2102 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2103 */
9e890a1f
JB		 2104 int align;
2105
2106 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2107 if (align) {
2108 if (WARN_ON(skb_headroom(skb) < 3)) {
2109 dev_kfree_skb(skb);
2110 skb = NULL;
2111 } else {
2112 u8 *data = skb->data;
8ce0b589
ZY		 2113 size_t len = skb_headlen(skb);
2114 skb->data -= align;
2115 memmove(skb->data, data, len);
2116 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2117 }
2118 }
9e890a1f 2119 }
d1c3a37c
JB		 2120#endif
2121
9e890a1f
JB		 2122 if (skb) {
2123 /* deliver to local stack */
2124 skb->protocol = eth_type_trans(skb, dev);
2125 memset(skb->cb, 0, sizeof(skb->cb));
06d181a8
JB		 2126 if (rx->local->napi)
2127 napi_gro_receive(rx->local->napi, skb);
2128 else
2129 netif_receive_skb(skb);
571ecf67
JB		 2130 }
2131
76ee65bf 2132 if (xmit_skb) {
aef6c928
HS		 2133 /*
2134 * Send to wireless media and increase priority by 256 to
2135 * keep the received priority instead of reclassifying
2136 * the frame (see cfg80211_classify8021d).
2137 */
2138 xmit_skb->priority += 256;
f831e909 2139 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2140 skb_reset_network_header(xmit_skb);
2141 skb_reset_mac_header(xmit_skb);
76ee65bf 2142 dev_queue_xmit(xmit_skb);
571ecf67 2143 }
76ee65bf
RR		 2144}
2145
49461622 2146static ieee80211_rx_result debug_noinline
5cf121c3 2147ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2148{
eb9fb5b8 2149 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2150 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2151 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2152 __le16 fc = hdr->frame_control;
eaf85ca7 2153 struct sk_buff_head frame_list;
554891e6 2154 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2155
358c8d9d 2156 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2157 return RX_CONTINUE;
fd4c7f2f 2158
358c8d9d 2159 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2160 return RX_DROP_MONITOR;
fd4c7f2f 2161
554891e6 2162 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2163 return RX_CONTINUE;
fd4c7f2f 2164
eaf85ca7
ZY		 2165 if (ieee80211_has_a4(hdr->frame_control) &&
2166 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2167 !rx->sdata->u.vlan.sta)
e4c26add 2168 return RX_DROP_UNUSABLE;
fd4c7f2f 2169
eaf85ca7
ZY		 2170 if (is_multicast_ether_addr(hdr->addr1) &&
2171 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2172 rx->sdata->u.vlan.sta) ||
2173 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2174 rx->sdata->u.mgd.use_4addr)))
e4c26add 2175 return RX_DROP_UNUSABLE;
fd4c7f2f 2176
eaf85ca7
ZY		 2177 skb->dev = dev;
2178 __skb_queue_head_init(&frame_list);
fd4c7f2f 2179
e3cf8b3f
ZY		 2180 if (skb_linearize(skb))
2181 return RX_DROP_UNUSABLE;
2182
eaf85ca7
ZY		 2183 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2184 rx->sdata->vif.type,
8b3becad 2185 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2186
eaf85ca7
ZY		 2187 while (!skb_queue_empty(&frame_list)) {
2188 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2189
358c8d9d 2190 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2191 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2192 continue;
2193 }
fd4c7f2f
RR		 2194
2195 ieee80211_deliver_skb(rx);
2196 }
2197
9ae54c84 2198 return RX_QUEUED;
fd4c7f2f
RR		 2199}
2200
bf94e17b 2201#ifdef CONFIG_MAC80211_MESH
b0dee578 2202static ieee80211_rx_result
e32f85f7
LCC		 2203ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2204{
30789eb6
TP		 2205 struct ieee80211_hdr *fwd_hdr, *hdr;
2206 struct ieee80211_tx_info *info;
e32f85f7 2207 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2208 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2209 struct ieee80211_local *local = rx->local;
eb9fb5b8 2210 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2211 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2212 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2213 u16 q, hdrlen;
e32f85f7
LCC		 2214
2215 hdr = (struct ieee80211_hdr *) skb->data;
2216 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2217
2218 /* make sure fixed part of mesh header is there, also checks skb len */
2219 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2220 return RX_DROP_MONITOR;
2221
2222 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2223
2224 /* make sure full mesh header is there, also checks skb len */
2225 if (!pskb_may_pull(rx->skb,
2226 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2227 return RX_DROP_MONITOR;
2228
2229 /* reload pointers */
2230 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2231 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2232
d0c22119
BC		 2233 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2234 return RX_DROP_MONITOR;
2235
2157fdd6
TP		 2236 /* frame is in RMC, don't forward */
2237 if (ieee80211_is_data(hdr->frame_control) &&
2238 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2239 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2240 return RX_DROP_MONITOR;
2241
555cb715
JC		 2242 if (!ieee80211_is_data(hdr->frame_control) ||
2243 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2244 return RX_CONTINUE;
2245
2246 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2247 return RX_DROP_MONITOR;
2248
43b7b314 2249 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2250 struct mesh_path *mppath;
43b7b314
JC		 2251 char *proxied_addr;
2252 char *mpp_addr;
2253
2254 if (is_multicast_ether_addr(hdr->addr1)) {
2255 mpp_addr = hdr->addr3;
2256 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2257 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2258 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2259 mpp_addr = hdr->addr4;
2260 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2261 } else {
2262 return RX_DROP_MONITOR;
43b7b314 2263 }
79617dee 2264
79617dee 2265 rcu_read_lock();
bf7cd94d 2266 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2267 if (!mppath) {
bf7cd94d 2268 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2269 } else {
2270 spin_lock_bh(&mppath->state_lock);
b203ca39 2271 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2272 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2273 spin_unlock_bh(&mppath->state_lock);
2274 }
2275 rcu_read_unlock();
2276 }
2277
3c5772a5
JC		 2278 /* Frame has reached destination. Don't forward */
2279 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2280 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2281 return RX_CONTINUE;
2282
00e96dec 2283 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2284 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2285 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2286 return RX_DROP_MONITOR;
2287 }
2288 skb_set_queue_mapping(skb, q);
e32f85f7 2289
30789eb6
TP		 2290 if (!--mesh_hdr->ttl) {
2291 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2292 goto out;
30789eb6
TP		 2293 }
2294
d665508b
CYY		 2295 if (!ifmsh->mshcfg.dot11MeshForwarding)
2296 goto out;
2297
30789eb6
TP		 2298 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2299 if (!fwd_skb) {
bdcbd8e0 2300 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2301 sdata->name);
30789eb6
TP		 2302 goto out;
2303 }
2304
2305 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2306 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2307 info = IEEE80211_SKB_CB(fwd_skb);
2308 memset(info, 0, sizeof(*info));
2309 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2310 info->control.vif = &rx->sdata->vif;
2311 info->control.jiffies = jiffies;
2312 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2313 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2314 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2315 /* update power mode indication when forwarding */
2316 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2317 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2318 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2319 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2320 } else {
2321 /* unable to resolve next hop */
bf7cd94d 2322 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2323 fwd_hdr->addr3, 0,
2324 WLAN_REASON_MESH_PATH_NOFORWARD,
2325 fwd_hdr->addr2);
30789eb6 2326 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2327 kfree_skb(fwd_skb);
30789eb6 2328 return RX_DROP_MONITOR;
e32f85f7
LCC		 2329 }
2330
30789eb6
TP		 2331 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2332 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2333 out:
df140465 2334 if (is_multicast_ether_addr(hdr->addr1))
e32f85f7 2335 return RX_CONTINUE;
df140465 2336 return RX_DROP_MONITOR;
e32f85f7 2337}
bf94e17b 2338#endif
e32f85f7 2339
49461622 2340static ieee80211_rx_result debug_noinline
5cf121c3 2341ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2342{
eb9fb5b8 2343 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2344 struct ieee80211_local *local = rx->local;
eb9fb5b8 2345 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2346 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2347 __le16 fc = hdr->frame_control;
4114fa21 2348 bool port_control;
ce3edf6d 2349 int err;
76ee65bf 2350
358c8d9d 2351 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2352 return RX_CONTINUE;
76ee65bf 2353
358c8d9d 2354 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2355 return RX_DROP_MONITOR;
76ee65bf 2356
79c892b8 2357 if (rx->sta) {
3d6dc343 2358 /* The seqno index has the same property as needed
79c892b8
JB		 2359 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2360 * for non-QoS-data frames. Here we know it's a data
2361 * frame, so count MSDUs.
2362 */
3d6dc343 2363 rx->sta->rx_msdu[rx->seqno_idx]++;
79c892b8
JB		 2364 }
2365
f14543ee 2366 /*
e7f4a940
JB		 2367 * Send unexpected-4addr-frame event to hostapd. For older versions,
2368 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2369 */
2370 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2371 sdata->vif.type == NL80211_IFTYPE_AP) {
2372 if (rx->sta &&
2373 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2374 cfg80211_rx_unexpected_4addr_frame(
2375 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2376 return RX_DROP_MONITOR;
e7f4a940 2377 }
f14543ee 2378
4114fa21 2379 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2380 if (unlikely(err))
e4c26add 2381 return RX_DROP_UNUSABLE;
76ee65bf 2382
358c8d9d 2383 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2384 return RX_DROP_MONITOR;
ce3edf6d 2385
8a4d32f3
AN		 2386 /* directly handle TDLS channel switch requests/responses */
2387 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2388 cpu_to_be16(ETH_P_TDLS))) {
2389 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2390
2391 if (pskb_may_pull(rx->skb,
2392 offsetof(struct ieee80211_tdls_data, u)) &&
2393 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2394 tf->category == WLAN_CATEGORY_TDLS &&
2395 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2396 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
2397 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TDLS_CHSW;
2398 skb_queue_tail(&sdata->skb_queue, rx->skb);
2399 ieee80211_queue_work(&rx->local->hw, &sdata->work);
2400 if (rx->sta)
2401 rx->sta->rx_packets++;
2402
2403 return RX_QUEUED;
2404 }
2405 }
2406
4114fa21
FF		 2407 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2408 unlikely(port_control) && sdata->bss) {
2409 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2410 u.ap);
2411 dev = sdata->dev;
2412 rx->sdata = sdata;
2413 }
2414
76ee65bf
RR		 2415 rx->skb->dev = dev;
2416
08ca944e 2417 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2418 !is_multicast_ether_addr(
2419 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2420 (!local->scanning &&
2421 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2422 mod_timer(&local->dynamic_ps_timer, jiffies +
2423 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2424 }
2425
76ee65bf 2426 ieee80211_deliver_skb(rx);
571ecf67 2427
9ae54c84 2428 return RX_QUEUED;
571ecf67
JB		 2429}
2430
49461622 2431static ieee80211_rx_result debug_noinline
f9e124fb 2432ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2433{
71364716 2434 struct sk_buff *skb = rx->skb;
a7767f95 2435 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2436 struct tid_ampdu_rx *tid_agg_rx;
2437 u16 start_seq_num;
2438 u16 tid;
2439
a7767f95 2440 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2441 return RX_CONTINUE;
71364716 2442
a7767f95 2443 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2444 struct {
2445 __le16 control, start_seq_num;
2446 } __packed bar_data;
2447
71364716 2448 if (!rx->sta)
a02ae758 2449 return RX_DROP_MONITOR;
8ae5977f
JB		 2450
2451 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2452 &bar_data, sizeof(bar_data)))
2453 return RX_DROP_MONITOR;
2454
8ae5977f 2455 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2456
2457 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2458 if (!tid_agg_rx)
a02ae758 2459 return RX_DROP_MONITOR;
71364716 2460
8ae5977f 2461 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2462
2463 /* reset session timer */
20ad19d0
JB		 2464 if (tid_agg_rx->timeout)
2465 mod_timer(&tid_agg_rx->session_timer,
2466 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2467
dd318575 2468 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2469 /* release stored frames up to start of BAR */
d3b2fb53 2470 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2471 start_seq_num, frames);
dd318575
JB		 2472 spin_unlock(&tid_agg_rx->reorder_lock);
2473
a02ae758
JB		 2474 kfree_skb(skb);
2475 return RX_QUEUED;
71364716
RR		 2476 }
2477
08daecae
JB		 2478 /*
2479 * After this point, we only want management frames,
2480 * so we can drop all remaining control frames to
2481 * cooked monitor interfaces.
2482 */
2483 return RX_DROP_MONITOR;
71364716
RR		 2484}
2485
f4f727a6
JM		 2486static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2487 struct ieee80211_mgmt *mgmt,
2488 size_t len)
fea14732
JM		 2489{
2490 struct ieee80211_local *local = sdata->local;
2491 struct sk_buff *skb;
2492 struct ieee80211_mgmt *resp;
2493
b203ca39 2494 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2495 /* Not to own unicast address */
2496 return;
2497 }
2498
b203ca39
JP		 2499 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2500 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2501 /* Not from the current AP or not associated yet. */
fea14732
JM		 2502 return;
2503 }
2504
2505 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2506 /* Too short SA Query request frame */
2507 return;
2508 }
2509
2510 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2511 if (skb == NULL)
2512 return;
2513
2514 skb_reserve(skb, local->hw.extra_tx_headroom);
2515 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2516 memset(resp, 0, 24);
2517 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2518 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2519 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2520 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2521 IEEE80211_STYPE_ACTION);
2522 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2523 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2524 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2525 memcpy(resp->u.action.u.sa_query.trans_id,
2526 mgmt->u.action.u.sa_query.trans_id,
2527 WLAN_SA_QUERY_TR_ID_LEN);
2528
62ae67be 2529 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2530}
2531
2e161f78
JB		 2532static ieee80211_rx_result debug_noinline
2533ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2534{
2535 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2536 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2537
2538 /*
2539 * From here on, look only at management frames.
2540 * Data and control frames are already handled,
2541 * and unknown (reserved) frames are useless.
2542 */
2543 if (rx->skb->len < 24)
2544 return RX_DROP_MONITOR;
2545
2546 if (!ieee80211_is_mgmt(mgmt->frame_control))
2547 return RX_DROP_MONITOR;
2548
ee971924
JB		 2549 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2550 ieee80211_is_beacon(mgmt->frame_control) &&
2551 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2552 int sig = 0;
2553
2554 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2555 sig = status->signal;
2556
ee971924
JB		 2557 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2558 rx->skb->data, rx->skb->len,
37c73b5f 2559 status->freq, sig);
ee971924
JB		 2560 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2561 }
2562
554891e6 2563 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2564 return RX_DROP_MONITOR;
2565
2566 if (ieee80211_drop_unencrypted_mgmt(rx))
2567 return RX_DROP_UNUSABLE;
2568
2569 return RX_CONTINUE;
2570}
2571
de1ede7a
JB		 2572static ieee80211_rx_result debug_noinline
2573ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2574{
2575 struct ieee80211_local *local = rx->local;
eb9fb5b8 2576 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2577 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2578 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2579 int len = rx->skb->len;
2580
2581 if (!ieee80211_is_action(mgmt->frame_control))
2582 return RX_CONTINUE;
2583
026331c4
JM		 2584 /* drop too small frames */
2585 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2586 return RX_DROP_UNUSABLE;
de1ede7a 2587
815b8092 2588 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2589 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2590 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2591 return RX_DROP_UNUSABLE;
de1ede7a 2592
554891e6 2593 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2594 return RX_DROP_UNUSABLE;
97ebe12a 2595
de1ede7a 2596 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2597 case WLAN_CATEGORY_HT:
2598 /* reject HT action frames from stations not supporting HT */
2599 if (!rx->sta->sta.ht_cap.ht_supported)
2600 goto invalid;
2601
2602 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2603 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2604 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2605 sdata->vif.type != NL80211_IFTYPE_AP &&
2606 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2607 break;
2608
ec61cd63 2609 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2610 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2611 goto invalid;
2612
2613 switch (mgmt->u.action.u.ht_smps.action) {
2614 case WLAN_HT_ACTION_SMPS: {
2615 struct ieee80211_supported_band *sband;
af0ed69b 2616 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2617
2618 /* convert to HT capability */
2619 switch (mgmt->u.action.u.ht_smps.smps_control) {
2620 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2621 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2622 break;
2623 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2624 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2625 break;
2626 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2627 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2628 break;
2629 default:
2630 goto invalid;
2631 }
1d8d3dec
JB		 2632
2633 /* if no change do nothing */
af0ed69b 2634 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2635 goto handled;
af0ed69b 2636 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2637
2638 sband = rx->local->hw.wiphy->bands[status->band];
2639
64f68e5d
JB		 2640 rate_control_rate_update(local, sband, rx->sta,
2641 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2642 goto handled;
2643 }
ec61cd63
JB		 2644 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2645 struct ieee80211_supported_band *sband;
2646 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1c45c5ce 2647 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
ec61cd63
JB		 2648
2649 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2650 if (!(rx->sta->sta.ht_cap.cap &
2651 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2652 goto handled;
2653
e1a0c6b3 2654 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
1c45c5ce 2655 max_bw = IEEE80211_STA_RX_BW_20;
e1a0c6b3 2656 else
1c45c5ce
EP		 2657 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2658
2659 /* set cur_max_bandwidth and recalc sta bw */
2660 rx->sta->cur_max_bandwidth = max_bw;
2661 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2662
e1a0c6b3 2663 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2664 goto handled;
2665
1c45c5ce 2666 rx->sta->sta.bandwidth = new_bw;
ec61cd63
JB		 2667 sband = rx->local->hw.wiphy->bands[status->band];
2668
2669 rate_control_rate_update(local, sband, rx->sta,
2670 IEEE80211_RC_BW_CHANGED);
2671 goto handled;
2672 }
1d8d3dec
JB		 2673 default:
2674 goto invalid;
2675 }
2676
0af83d3d 2677 break;
1b3a2e49
JB		 2678 case WLAN_CATEGORY_PUBLIC:
2679 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2680 goto invalid;
2681 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2682 break;
2683 if (!rx->sta)
2684 break;
2685 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2686 break;
2687 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2688 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2689 break;
2690 if (len < offsetof(struct ieee80211_mgmt,
2691 u.action.u.ext_chan_switch.variable))
2692 goto invalid;
2693 goto queue;
0af83d3d
JB		 2694 case WLAN_CATEGORY_VHT:
2695 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2696 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2697 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2698 sdata->vif.type != NL80211_IFTYPE_AP &&
2699 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2700 break;
2701
2702 /* verify action code is present */
2703 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2704 goto invalid;
2705
2706 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2707 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2708 u8 opmode;
2709
2710 /* verify opmode is present */
2711 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2712 goto invalid;
2713
2714 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2715
2716 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2717 opmode, status->band,
2718 false);
0af83d3d
JB		 2719 goto handled;
2720 }
2721 default:
2722 break;
2723 }
1d8d3dec 2724 break;
de1ede7a 2725 case WLAN_CATEGORY_BACK:
8abd3f9b 2726 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2727 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2728 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2729 sdata->vif.type != NL80211_IFTYPE_AP &&
2730 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2731 break;
8abd3f9b 2732
026331c4
JM		 2733 /* verify action_code is present */
2734 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2735 break;
2736
de1ede7a
JB		 2737 switch (mgmt->u.action.u.addba_req.action_code) {
2738 case WLAN_ACTION_ADDBA_REQ:
2739 if (len < (IEEE80211_MIN_ACTION_SIZE +
2740 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2741 goto invalid;
2742 break;
de1ede7a
JB		 2743 case WLAN_ACTION_ADDBA_RESP:
2744 if (len < (IEEE80211_MIN_ACTION_SIZE +
2745 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2746 goto invalid;
2747 break;
de1ede7a
JB		 2748 case WLAN_ACTION_DELBA:
2749 if (len < (IEEE80211_MIN_ACTION_SIZE +
2750 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2751 goto invalid;
2752 break;
2753 default:
2754 goto invalid;
de1ede7a 2755 }
bed7ee6e 2756
8b58ff83 2757 goto queue;
39192c0b 2758 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2759 /* verify action_code is present */
2760 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2761 break;
2762
39192c0b
JB		 2763 switch (mgmt->u.action.u.measurement.action_code) {
2764 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2765 if (status->band != IEEE80211_BAND_5GHZ)
2766 break;
2767
39192c0b
JB		 2768 if (len < (IEEE80211_MIN_ACTION_SIZE +
2769 sizeof(mgmt->u.action.u.measurement)))
84040805 2770 break;
cd7760e6
SW		 2771
2772 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2773 break;
2774
39192c0b 2775 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2776 goto handled;
cd7760e6
SW		 2777 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2778 u8 *bssid;
2779 if (len < (IEEE80211_MIN_ACTION_SIZE +
2780 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2781 break;
cc32abd4 2782
cd7760e6 2783 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2784 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2785 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2786 break;
2787
2788 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2789 bssid = sdata->u.mgd.bssid;
2790 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2791 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2792 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2793 bssid = mgmt->sa;
cd7760e6
SW		 2794 else
2795 break;
2796
2797 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2798 break;
c481ec97 2799
8b58ff83 2800 goto queue;
cd7760e6 2801 }
39192c0b
JB		 2802 }
2803 break;
fea14732
JM		 2804 case WLAN_CATEGORY_SA_QUERY:
2805 if (len < (IEEE80211_MIN_ACTION_SIZE +
2806 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2807 break;
2808
fea14732
JM		 2809 switch (mgmt->u.action.u.sa_query.action) {
2810 case WLAN_ACTION_SA_QUERY_REQUEST:
2811 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2812 break;
fea14732 2813 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2814 goto handled;
fea14732
JM		 2815 }
2816 break;
8db09850 2817 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2818 if (len < (IEEE80211_MIN_ACTION_SIZE +
2819 sizeof(mgmt->u.action.u.self_prot.action_code)))
2820 break;
2821
8db09850
TP		 2822 switch (mgmt->u.action.u.self_prot.action_code) {
2823 case WLAN_SP_MESH_PEERING_OPEN:
2824 case WLAN_SP_MESH_PEERING_CLOSE:
2825 case WLAN_SP_MESH_PEERING_CONFIRM:
2826 if (!ieee80211_vif_is_mesh(&sdata->vif))
2827 goto invalid;
a6dad6a2 2828 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2829 /* userspace handles this frame */
2830 break;
2831 goto queue;
2832 case WLAN_SP_MGK_INFORM:
2833 case WLAN_SP_MGK_ACK:
2834 if (!ieee80211_vif_is_mesh(&sdata->vif))
2835 goto invalid;
2836 break;
2837 }
2838 break;
d3aaec8a 2839 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2840 if (len < (IEEE80211_MIN_ACTION_SIZE +
2841 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2842 break;
2843
77a121c3
JB		 2844 if (!ieee80211_vif_is_mesh(&sdata->vif))
2845 break;
25d49e4d 2846 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2847 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2848 break;
2849 goto queue;
84040805 2850 }
026331c4 2851
2e161f78
JB		 2852 return RX_CONTINUE;
2853
bed7ee6e 2854 invalid:
554891e6 2855 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2856 /* will return in the next handlers */
2857 return RX_CONTINUE;
2858
2859 handled:
2860 if (rx->sta)
2861 rx->sta->rx_packets++;
2862 dev_kfree_skb(rx->skb);
2863 return RX_QUEUED;
2864
2865 queue:
2866 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2867 skb_queue_tail(&sdata->skb_queue, rx->skb);
2868 ieee80211_queue_work(&local->hw, &sdata->work);
2869 if (rx->sta)
2870 rx->sta->rx_packets++;
2871 return RX_QUEUED;
2872}
2873
2874static ieee80211_rx_result debug_noinline
2875ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2876{
554891e6 2877 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2878 int sig = 0;
2e161f78
JB		 2879
2880 /* skip known-bad action frames and return them in the next handler */
554891e6 2881 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2882 return RX_CONTINUE;
d7907448 2883
026331c4
JM		 2884 /*
2885 * Getting here means the kernel doesn't know how to handle
2886 * it, but maybe userspace does ... include returned frames
2887 * so userspace can register for those to know whether ones
2888 * it transmitted were processed or returned.
2889 */
026331c4 2890
804483e9
JB		 2891 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2892 sig = status->signal;
2893
71bbc994 2894 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2895 rx->skb->data, rx->skb->len, 0)) {
2e161f78
JB		 2896 if (rx->sta)
2897 rx->sta->rx_packets++;
2898 dev_kfree_skb(rx->skb);
2899 return RX_QUEUED;
2900 }
2901
2e161f78
JB		 2902 return RX_CONTINUE;
2903}
2904
2905static ieee80211_rx_result debug_noinline
2906ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2907{
2908 struct ieee80211_local *local = rx->local;
2909 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2910 struct sk_buff *nskb;
2911 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2912 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2913
2914 if (!ieee80211_is_action(mgmt->frame_control))
2915 return RX_CONTINUE;
2916
2917 /*
2918 * For AP mode, hostapd is responsible for handling any action
2919 * frames that we didn't handle, including returning unknown
2920 * ones. For all other modes we will return them to the sender,
2921 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2922 * 802.11-2012 9.24.4.
2e161f78
JB		 2923 * Newer versions of hostapd shall also use the management frame
2924 * registration mechanisms, but older ones still use cooked
2925 * monitor interfaces so push all frames there.
2926 */
554891e6 2927 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2928 (sdata->vif.type == NL80211_IFTYPE_AP ||
2929 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2930 return RX_DROP_MONITOR;
026331c4 2931
4b5ebccc
JB		 2932 if (is_multicast_ether_addr(mgmt->da))
2933 return RX_DROP_MONITOR;
2934
84040805
JB		 2935 /* do not return rejected action frames */
2936 if (mgmt->u.action.category & 0x80)
2937 return RX_DROP_UNUSABLE;
2938
2939 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2940 GFP_ATOMIC);
2941 if (nskb) {
292b4df6 2942 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2943
292b4df6
JL		 2944 nmgmt->u.action.category |= 0x80;
2945 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2946 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2947
2948 memset(nskb->cb, 0, sizeof(nskb->cb));
2949
07e5a5f5
JB		 2950 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2951 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2952
2953 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2954 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2955 IEEE80211_TX_CTL_NO_CCK_RATE;
2956 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2957 info->hw_queue =
2958 local->hw.offchannel_tx_hw_queue;
2959 }
2960
2961 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2962 status->band);
de1ede7a 2963 }
39192c0b
JB		 2964 dev_kfree_skb(rx->skb);
2965 return RX_QUEUED;
de1ede7a
JB		 2966}
2967
49461622 2968static ieee80211_rx_result debug_noinline
5cf121c3 2969ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2970{
eb9fb5b8 2971 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2972 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2973 __le16 stype;
571ecf67 2974
77a121c3 2975 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2976
77a121c3
JB		 2977 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2978 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 2979 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 2980 sdata->vif.type != NL80211_IFTYPE_STATION)
2981 return RX_DROP_MONITOR;
472dbc45 2982
77a121c3 2983 switch (stype) {
66e67e41 2984 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2985 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2986 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2987 /* process for all: mesh, mlme, ibss */
2988 break;
66e67e41
JB		 2989 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2990 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2991 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2992 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2993 if (is_multicast_ether_addr(mgmt->da) &&
2994 !is_broadcast_ether_addr(mgmt->da))
2995 return RX_DROP_MONITOR;
2996
77a121c3
JB		 2997 /* process only for station */
2998 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2999 return RX_DROP_MONITOR;
3000 break;
3001 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 3002 /* process only for ibss and mesh */
3003 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3004 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 3005 return RX_DROP_MONITOR;
3006 break;
3007 default:
3008 return RX_DROP_MONITOR;
3009 }
f9d540ee 3010
77a121c3 3011 /* queue up frame and kick off work to process it */
c1475ca9 3012 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 3013 skb_queue_tail(&sdata->skb_queue, rx->skb);
3014 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 3015 if (rx->sta)
3016 rx->sta->rx_packets++;
46900298 3017
77a121c3 3018 return RX_QUEUED;
571ecf67
JB		 3019}
3020
5cf121c3 3021/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 3022static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3023 struct ieee80211_rate *rate)
3d30d949
MW		 3024{
3025 struct ieee80211_sub_if_data *sdata;
3026 struct ieee80211_local *local = rx->local;
3d30d949
MW		 3027 struct sk_buff *skb = rx->skb, *skb2;
3028 struct net_device *prev_dev = NULL;
eb9fb5b8 3029 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 3030 int needed_headroom;
3d30d949 3031
554891e6
JB		 3032 /*
3033 * If cooked monitor has been processed already, then
3034 * don't do it again. If not, set the flag.
3035 */
3036 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 3037 goto out_free_skb;
554891e6 3038 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 3039
152c477a
JB		 3040 /* If there are no cooked monitor interfaces, just free the SKB */
3041 if (!local->cooked_mntrs)
3042 goto out_free_skb;
3043
1f7bba79
JB		 3044 /* vendor data is long removed here */
3045 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 3046 /* room for the radiotap header based on driver features */
1f7bba79 3047 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 3048
293702a3
JB		 3049 if (skb_headroom(skb) < needed_headroom &&
3050 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
3051 goto out_free_skb;
3d30d949 3052
293702a3 3053 /* prepend radiotap information */
973ef21a
FF		 3054 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3055 false);
3d30d949
MW		 3056
3057 skb_set_mac_header(skb, 0);
3058 skb->ip_summed = CHECKSUM_UNNECESSARY;
3059 skb->pkt_type = PACKET_OTHERHOST;
3060 skb->protocol = htons(ETH_P_802_2);
3061
3062 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 3063 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 3064 continue;
3065
05c914fe 3066 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 3067 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3068 continue;
3069
3070 if (prev_dev) {
3071 skb2 = skb_clone(skb, GFP_ATOMIC);
3072 if (skb2) {
3073 skb2->dev = prev_dev;
5548a8a1 3074 netif_receive_skb(skb2);
3d30d949
MW		 3075 }
3076 }
3077
3078 prev_dev = sdata->dev;
3079 sdata->dev->stats.rx_packets++;
3080 sdata->dev->stats.rx_bytes += skb->len;
3081 }
3082
3083 if (prev_dev) {
3084 skb->dev = prev_dev;
5548a8a1 3085 netif_receive_skb(skb);
554891e6
JB		 3086 return;
3087 }
3d30d949
MW		 3088
3089 out_free_skb:
3090 dev_kfree_skb(skb);
3091}
3092
aa0c8636
CL		 3093static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3094 ieee80211_rx_result res)
3095{
3096 switch (res) {
3097 case RX_DROP_MONITOR:
3098 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3099 if (rx->sta)
3100 rx->sta->rx_dropped++;
3101 /* fall through */
3102 case RX_CONTINUE: {
3103 struct ieee80211_rate *rate = NULL;
3104 struct ieee80211_supported_band *sband;
3105 struct ieee80211_rx_status *status;
3106
3107 status = IEEE80211_SKB_RXCB((rx->skb));
3108
3109 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3110 if (!(status->flag & RX_FLAG_HT) &&
3111 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3112 rate = &sband->bitrates[status->rate_idx];
3113
3114 ieee80211_rx_cooked_monitor(rx, rate);
3115 break;
3116 }
3117 case RX_DROP_UNUSABLE:
3118 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3119 if (rx->sta)
3120 rx->sta->rx_dropped++;
3121 dev_kfree_skb(rx->skb);
3122 break;
3123 case RX_QUEUED:
3124 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3125 break;
3126 }
3127}
571ecf67 3128
f9e124fb
CL		 3129static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3130 struct sk_buff_head *frames)
58905290 3131{
58905290 3132 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3133 struct sk_buff *skb;
8944b79f 3134
e32f85f7
LCC		 3135#define CALL_RXH(rxh) \
3136 do { \
3137 res = rxh(rx); \
3138 if (res != RX_CONTINUE) \
2569a826 3139 goto rxh_next; \
e32f85f7 3140 } while (0);
49461622 3141
45ceeee8
JB		 3142 /* Lock here to avoid hitting all of the data used in the RX
3143 * path (e.g. key data, station data, ...) concurrently when
3144 * a frame is released from the reorder buffer due to timeout
3145 * from the timer, potentially concurrently with RX from the
3146 * driver.
3147 */
f9e124fb 3148 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3149
f9e124fb 3150 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3151 /*
3152 * all the other fields are valid across frames
3153 * that belong to an aMPDU since they are on the
3154 * same TID from the same station
3155 */
3156 rx->skb = skb;
3157
2569a826 3158 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 3159 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 3160 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 3161 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 3162 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 3163 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3164 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3165#ifdef CONFIG_MAC80211_MESH
aa0c8636 3166 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3167 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3168#endif
2154c81c 3169 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 3170 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 3171
3172 /* special treatment -- needs the queue */
3173 res = ieee80211_rx_h_ctrl(rx, frames);
3174 if (res != RX_CONTINUE)
3175 goto rxh_next;
3176
2e161f78 3177 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3178 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3179 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3180 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3181 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3182
aa0c8636
CL		 3183 rxh_next:
3184 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3185
49461622 3186#undef CALL_RXH
aa0c8636 3187 }
24a8fdad 3188
f9e124fb 3189 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3190}
3191
4406c376 3192static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3193{
f9e124fb 3194 struct sk_buff_head reorder_release;
aa0c8636
CL		 3195 ieee80211_rx_result res = RX_DROP_MONITOR;
3196
f9e124fb
CL		 3197 __skb_queue_head_init(&reorder_release);
3198
aa0c8636
CL		 3199#define CALL_RXH(rxh) \
3200 do { \
3201 res = rxh(rx); \
3202 if (res != RX_CONTINUE) \
3203 goto rxh_next; \
3204 } while (0);
3205
0395442a 3206 CALL_RXH(ieee80211_rx_h_check_dup)
aa0c8636
CL		 3207 CALL_RXH(ieee80211_rx_h_check)
3208
f9e124fb 3209 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3210
f9e124fb 3211 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3212 return;
49461622 3213
2569a826 3214 rxh_next:
aa0c8636
CL		 3215 ieee80211_rx_handlers_result(rx, res);
3216
3217#undef CALL_RXH
58905290
JB		 3218}
3219
2bff8ebf 3220/*
dd318575
JB		 3221 * This function makes calls into the RX path, therefore
3222 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3223 */
3224void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3225{
f9e124fb 3226 struct sk_buff_head frames;
554891e6
JB		 3227 struct ieee80211_rx_data rx = {
3228 .sta = sta,
3229 .sdata = sta->sdata,
3230 .local = sta->local,
9e26297a
JB		 3231 /* This is OK -- must be QoS data frame */
3232 .security_idx = tid,
3233 .seqno_idx = tid,
fcf8bd3b 3234 .flags = 0,
554891e6 3235 };
2c15a0cf
CL		 3236 struct tid_ampdu_rx *tid_agg_rx;
3237
3238 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3239 if (!tid_agg_rx)
3240 return;
2bff8ebf 3241
f9e124fb
CL		 3242 __skb_queue_head_init(&frames);
3243
2c15a0cf 3244 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3245 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3246 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3247
f9e124fb 3248 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3249}
3250
571ecf67
JB		 3251/* main receive path */
3252
3c2723f5
JB		 3253static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3254 struct ieee80211_hdr *hdr)
23a24def 3255{
20b01f80 3256 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3257 struct sk_buff *skb = rx->skb;
3258 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3259 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3260 int multicast = is_multicast_ether_addr(hdr->addr1);
3261
51fb61e7 3262 switch (sdata->vif.type) {
05c914fe 3263 case NL80211_IFTYPE_STATION:
9bc383de 3264 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3265 return false;
77fdaa12 3266 if (!multicast &&
df140465
JB		 3267 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3268 return false;
23a24def 3269 break;
05c914fe 3270 case NL80211_IFTYPE_ADHOC:
23a24def 3271 if (!bssid)
3c2723f5 3272 return false;
6329b8d9
FF		 3273 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3274 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3275 return false;
a7767f95 3276 if (ieee80211_is_beacon(hdr->frame_control)) {
3c2723f5 3277 return true;
d48b2968 3278 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3c2723f5 3279 return false;
23a24def 3280 } else if (!multicast &&
b203ca39 3281 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
df140465 3282 return false;
0fb8ca45
JM		 3283 } else if (!rx->sta) {
3284 int rate_idx;
5614618e
JB		 3285 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3286 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3287 else
eb9fb5b8 3288 rate_idx = status->rate_idx;
8bf11d8d
JB		 3289 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3290 BIT(rate_idx));
0fb8ca45 3291 }
23a24def 3292 break;
239281f8
RL		 3293 case NL80211_IFTYPE_OCB:
3294 if (!bssid)
3295 return false;
3296 if (ieee80211_is_beacon(hdr->frame_control)) {
3297 return false;
3298 } else if (!is_broadcast_ether_addr(bssid)) {
3299 ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3300 return false;
3301 } else if (!multicast &&
3302 !ether_addr_equal(sdata->dev->dev_addr,
3303 hdr->addr1)) {
df140465 3304 return false;
239281f8
RL		 3305 } else if (!rx->sta) {
3306 int rate_idx;
3307 if (status->flag & RX_FLAG_HT)
3308 rate_idx = 0; /* TODO: HT rates */
3309 else
3310 rate_idx = status->rate_idx;
3311 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3312 BIT(rate_idx));
3313 }
3314 break;
05c914fe 3315 case NL80211_IFTYPE_MESH_POINT:
6032f934 3316 if (!multicast &&
df140465
JB		 3317 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3318 return false;
6032f934 3319 break;
05c914fe
JB		 3320 case NL80211_IFTYPE_AP_VLAN:
3321 case NL80211_IFTYPE_AP:
23a24def 3322 if (!bssid) {
b203ca39 3323 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3324 return false;
f142c6b9 3325 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3326 /*
3327 * Accept public action frames even when the
3328 * BSSID doesn't match, this is used for P2P
3329 * and location updates. Note that mac80211
3330 * itself never looks at these frames.
3331 */
2b9ccd4e
JB		 3332 if (!multicast &&
3333 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3334 return false;
d48b2968 3335 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3336 return true;
d48b2968 3337 if (!ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3338 return false;
554891e6 3339 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
db8e1732
AN		 3340 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3341 /* ignore data frames to TDLS-peers */
3342 if (ieee80211_is_data(hdr->frame_control))
3343 return false;
3344 /* ignore action frames to TDLS-peers */
3345 if (ieee80211_is_action(hdr->frame_control) &&
3346 !ether_addr_equal(bssid, hdr->addr1))
3347 return false;
23a24def 3348 }
23a24def 3349 break;
05c914fe 3350 case NL80211_IFTYPE_WDS:
a7767f95 3351 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3352 return false;
b203ca39 3353 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3c2723f5 3354 return false;
23a24def 3355 break;
f142c6b9
JB		 3356 case NL80211_IFTYPE_P2P_DEVICE:
3357 if (!ieee80211_is_public_action(hdr, skb->len) &&
3358 !ieee80211_is_probe_req(hdr->frame_control) &&
3359 !ieee80211_is_probe_resp(hdr->frame_control) &&
3360 !ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3361 return false;
1b737f88
JB		 3362 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3363 !multicast)
f142c6b9
JB		 3364 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3365 break;
2ca27bcf 3366 default:
fb1c1cd6 3367 /* should never get here */
f142c6b9 3368 WARN_ON_ONCE(1);
fb1c1cd6 3369 break;
23a24def
JB		 3370 }
3371
3c2723f5 3372 return true;
23a24def
JB		 3373}
3374
4406c376
JB		 3375/*
3376 * This function returns whether or not the SKB
3377 * was destined for RX processing or not, which,
3378 * if consume is true, is equivalent to whether
3379 * or not the skb was consumed.
3380 */
3381static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3382 struct sk_buff *skb, bool consume)
3383{
3384 struct ieee80211_local *local = rx->local;
3385 struct ieee80211_sub_if_data *sdata = rx->sdata;
3386 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3387 struct ieee80211_hdr *hdr = (void *)skb->data;
4406c376
JB		 3388
3389 rx->skb = skb;
554891e6 3390 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376 3391
40791942 3392 if (!prepare_for_handlers(rx, hdr))
4406c376
JB		 3393 return false;
3394
4406c376
JB		 3395 if (!consume) {
3396 skb = skb_copy(skb, GFP_ATOMIC);
3397 if (!skb) {
3398 if (net_ratelimit())
3399 wiphy_debug(local->hw.wiphy,
b305dae4 3400 "failed to copy skb for %s\n",
4406c376
JB		 3401 sdata->name);
3402 return true;
3403 }
3404
3405 rx->skb = skb;
3406 }
3407
3408 ieee80211_invoke_rx_handlers(rx);
3409 return true;
3410}
3411
571ecf67 3412/*
6b59db7d 3413 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3414 * be called with rcu_read_lock protection.
571ecf67 3415 */
71ebb4aa 3416static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3417 struct sk_buff *skb)
571ecf67
JB		 3418{
3419 struct ieee80211_local *local = hw_to_local(hw);
3420 struct ieee80211_sub_if_data *sdata;
571ecf67 3421 struct ieee80211_hdr *hdr;
e3cf8b3f 3422 __le16 fc;
5cf121c3 3423 struct ieee80211_rx_data rx;
4406c376 3424 struct ieee80211_sub_if_data *prev;
7bedd0cf
JB		 3425 struct sta_info *sta, *prev_sta;
3426 struct rhash_head *tmp;
e3cf8b3f 3427 int err = 0;
571ecf67 3428
e3cf8b3f 3429 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3430 memset(&rx, 0, sizeof(rx));
3431 rx.skb = skb;
3432 rx.local = local;
72abd81b 3433
e3cf8b3f 3434 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3435 local->dot11ReceivedFragmentCount++;
571ecf67 3436
4a4f1a58
JB		 3437 if (ieee80211_is_mgmt(fc)) {
3438 /* drop frame if too short for header */
3439 if (skb->len < ieee80211_hdrlen(fc))
3440 err = -ENOBUFS;
3441 else
3442 err = skb_linearize(skb);
3443 } else {
e3cf8b3f 3444 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3445 }
e3cf8b3f
ZY		 3446
3447 if (err) {
3448 dev_kfree_skb(skb);
3449 return;
3450 }
3451
3452 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3453 ieee80211_parse_qos(&rx);
d1c3a37c 3454 ieee80211_verify_alignment(&rx);
38f3714d 3455
d48b2968
JB		 3456 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3457 ieee80211_is_beacon(hdr->frame_control)))
3458 ieee80211_scan_rx(local, skb);
3459
e3cf8b3f 3460 if (ieee80211_is_data(fc)) {
7bedd0cf
JB		 3461 const struct bucket_table *tbl;
3462
56af3268 3463 prev_sta = NULL;
4406c376 3464
7bedd0cf
JB		 3465 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3466
3467 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
56af3268
BG		 3468 if (!prev_sta) {
3469 prev_sta = sta;
3470 continue;
3471 }
3472
3473 rx.sta = prev_sta;
3474 rx.sdata = prev_sta->sdata;
4406c376 3475 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3476
56af3268 3477 prev_sta = sta;
4406c376 3478 }
56af3268
BG		 3479
3480 if (prev_sta) {
3481 rx.sta = prev_sta;
3482 rx.sdata = prev_sta->sdata;
3483
4406c376 3484 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3485 return;
8e26d5ad 3486 goto out;
56af3268 3487 }
4406c376
JB		 3488 }
3489
4b0dd98e 3490 prev = NULL;
b2e7771e 3491
4b0dd98e
JB		 3492 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3493 if (!ieee80211_sdata_running(sdata))
3494 continue;
340e11f3 3495
4b0dd98e
JB		 3496 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3497 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3498 continue;
340e11f3 3499
4b0dd98e
JB		 3500 /*
3501 * frame is destined for this interface, but if it's
3502 * not also for the previous one we handle that after
3503 * the loop to avoid copying the SKB once too much
3504 */
4bb29f8c 3505
4b0dd98e 3506 if (!prev) {
abe60632 3507 prev = sdata;
4b0dd98e 3508 continue;
340e11f3 3509 }
4bb29f8c 3510
7852e361 3511 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3512 rx.sdata = prev;
3513 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3514
4b0dd98e
JB		 3515 prev = sdata;
3516 }
3517
3518 if (prev) {
7852e361 3519 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3520 rx.sdata = prev;
4406c376 3521
4b0dd98e
JB		 3522 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3523 return;
571ecf67 3524 }
4406c376 3525
8e26d5ad 3526 out:
4406c376 3527 dev_kfree_skb(skb);
571ecf67 3528}
6368e4b1
RR		 3529
3530/*
3531 * This is the receive path handler. It is called by a low level driver when an
3532 * 802.11 MPDU is received from the hardware.
3533 */
103bf9f7 3534void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3535{
3536 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3537 struct ieee80211_rate *rate = NULL;
3538 struct ieee80211_supported_band *sband;
f1d58c25 3539 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3540
d20ef63d
JB		 3541 WARN_ON_ONCE(softirq_count() == 0);
3542
444e3803 3543 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3544 goto drop;
8318d78a
JB		 3545
3546 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3547 if (WARN_ON(!sband))
3548 goto drop;
8318d78a 3549
89c3a8ac
JB		 3550 /*
3551 * If we're suspending, it is possible although not too likely
3552 * that we'd be receiving frames after having already partially
3553 * quiesced the stack. We can't process such frames then since
3554 * that might, for example, cause stations to be added or other
3555 * driver callbacks be invoked.
3556 */
77a980dc
JB		 3557 if (unlikely(local->quiescing || local->suspended))
3558 goto drop;
89c3a8ac 3559
04800ada
AN		 3560 /* We might be during a HW reconfig, prevent Rx for the same reason */
3561 if (unlikely(local->in_reconfig))
3562 goto drop;
3563
ea77f12f
JB		 3564 /*
3565 * The same happens when we're not even started,
3566 * but that's worth a warning.
3567 */
77a980dc
JB		 3568 if (WARN_ON(!local->started))
3569 goto drop;
ea77f12f 3570
fc885189 3571 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3572 /*
fc885189
JB		 3573 * Validate the rate, unless a PLCP error means that
3574 * we probably can't have a valid rate here anyway.
e5d6eb83 3575 */
fc885189
JB		 3576
3577 if (status->flag & RX_FLAG_HT) {
3578 /*
3579 * rate_idx is MCS index, which can be [0-76]
3580 * as documented on:
3581 *
3582 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3583 *
3584 * Anything else would be some sort of driver or
3585 * hardware error. The driver should catch hardware
3586 * errors.
3587 */
444e3803 3588 if (WARN(status->rate_idx > 76,
fc885189
JB		 3589 "Rate marked as an HT rate but passed "
3590 "status->rate_idx is not "
3591 "an MCS index [0-76]: %d (0x%02x)\n",
3592 status->rate_idx,
3593 status->rate_idx))
3594 goto drop;
5614618e
JB		 3595 } else if (status->flag & RX_FLAG_VHT) {
3596 if (WARN_ONCE(status->rate_idx > 9 ||
3597 !status->vht_nss ||
3598 status->vht_nss > 8,
3599 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3600 status->rate_idx, status->vht_nss))
3601 goto drop;
fc885189 3602 } else {
444e3803 3603 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3604 goto drop;
3605 rate = &sband->bitrates[status->rate_idx];
3606 }
0fb8ca45 3607 }
6368e4b1 3608
554891e6
JB		 3609 status->rx_flags = 0;
3610
6368e4b1
RR		 3611 /*
3612 * key references and virtual interfaces are protected using RCU
3613 * and this requires that we are in a read-side RCU section during
3614 * receive processing
3615 */
3616 rcu_read_lock();
3617
3618 /*
3619 * Frames with failed FCS/PLCP checksum are not returned,
3620 * all other frames are returned without radiotap header
3621 * if it was previously present.
3622 * Also, frames with less than 16 bytes are dropped.
3623 */
f1d58c25 3624 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3625 if (!skb) {
3626 rcu_read_unlock();
3627 return;
3628 }
3629
e1e54068
JB		 3630 ieee80211_tpt_led_trig_rx(local,
3631 ((struct ieee80211_hdr *)skb->data)->frame_control,
3632 skb->len);
071d9ac2 3633 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3634
3635 rcu_read_unlock();
77a980dc
JB		 3636
3637 return;
3638 drop:
3639 kfree_skb(skb);
6368e4b1 3640}
103bf9f7 3641EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3642
3643/* This is a version of the rx handler that can be called from hard irq
3644 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3645void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3646{
3647 struct ieee80211_local *local = hw_to_local(hw);
3648
3649 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3650
571ecf67
JB		 3651 skb->pkt_type = IEEE80211_RX_MSG;
3652 skb_queue_tail(&local->skb_queue, skb);
3653 tasklet_schedule(&local->tasklet);
3654}
3655EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)