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cfg80211: introduce regulatory flags controlling bw
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
d98ad83e 6 * Copyright 2013-2014 Intel Mobile Communications GmbH
571ecf67
JB		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
ab46623e 13#include <linux/jiffies.h>
5a0e3ad6 14#include <linux/slab.h>
571ecf67
JB		 15#include <linux/kernel.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
d4e46a3d 19#include <linux/rcupdate.h>
bc3b2d7f 20#include <linux/export.h>
571ecf67
JB		 21#include <net/mac80211.h>
22#include <net/ieee80211_radiotap.h>
d26ad377 23#include <asm/unaligned.h>
571ecf67
JB		 24
25#include "ieee80211_i.h"
24487981 26#include "driver-ops.h"
2c8dccc7 27#include "led.h"
33b64eb2 28#include "mesh.h"
571ecf67
JB		 29#include "wep.h"
30#include "wpa.h"
31#include "tkip.h"
32#include "wme.h"
1d8d3dec 33#include "rate.h"
571ecf67 34
b2e7771e
JB		 35/*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
1f7bba79
JB		 42 struct sk_buff *skb,
43 unsigned int rtap_vendor_space)
b2e7771e 44{
b2e7771e
JB		 45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
e3cf8b3f 47 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
0624760c 52 return NULL;
b2e7771e
JB		 53 }
54 }
55
1f7bba79
JB		 56 __pskb_pull(skb, rtap_vendor_space);
57
b2e7771e
JB		 58 return skb;
59}
60
1f7bba79
JB		 61static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
62 unsigned int rtap_vendor_space)
b2e7771e 63{
f1d58c25 64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1f7bba79
JB		 65 struct ieee80211_hdr *hdr;
66
67 hdr = (void *)(skb->data + rtap_vendor_space);
b2e7771e 68
4c298677
JB		 69 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
70 RX_FLAG_FAILED_PLCP_CRC |
71 RX_FLAG_AMPDU_IS_ZEROLEN))
6b59db7d
ZG		 72 return true;
73
1f7bba79 74 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
6b59db7d
ZG		 75 return true;
76
87228f57
HH		 77 if (ieee80211_is_ctl(hdr->frame_control) &&
78 !ieee80211_is_pspoll(hdr->frame_control) &&
79 !ieee80211_is_back_req(hdr->frame_control))
6b59db7d
ZG		 80 return true;
81
82 return false;
b2e7771e
JB		 83}
84
601ae7f2 85static int
1f7bba79
JB		 86ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
87 struct ieee80211_rx_status *status,
88 struct sk_buff *skb)
601ae7f2
BR		 89{
90 int len;
91
92 /* always present fields */
a144f378 93 len = sizeof(struct ieee80211_radiotap_header) + 8;
601ae7f2 94
a144f378 95 /* allocate extra bitmaps */
a144f378
JB		 96 if (status->chains)
97 len += 4 * hweight8(status->chains);
90b9e446
JB		 98
99 if (ieee80211_have_rx_timestamp(status)) {
100 len = ALIGN(len, 8);
601ae7f2 101 len += 8;
90b9e446 102 }
7fee5372 103 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 104 len += 1;
601ae7f2 105
a144f378
JB		 106 /* antenna field, if we don't have per-chain info */
107 if (!status->chains)
108 len += 1;
109
90b9e446
JB		 110 /* padding for RX_FLAGS if necessary */
111 len = ALIGN(len, 2);
601ae7f2 112
6d744bac
JB		 113 if (status->flag & RX_FLAG_HT) /* HT info */
114 len += 3;
115
4c298677 116 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 117 len = ALIGN(len, 4);
4c298677
JB		 118 len += 8;
119 }
120
51648921
JB		 121 if (status->flag & RX_FLAG_VHT) {
122 len = ALIGN(len, 2);
123 len += 12;
124 }
125
a144f378
JB		 126 if (status->chains) {
127 /* antenna and antenna signal fields */
128 len += 2 * hweight8(status->chains);
129 }
130
1f7bba79
JB		 131 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
132 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
133
134 /* vendor presence bitmap */
135 len += 4;
136 /* alignment for fixed 6-byte vendor data header */
137 len = ALIGN(len, 2);
138 /* vendor data header */
139 len += 6;
140 if (WARN_ON(rtap->align == 0))
141 rtap->align = 1;
142 len = ALIGN(len, rtap->align);
143 len += rtap->len + rtap->pad;
144 }
145
601ae7f2
BR		 146 return len;
147}
148
00ea6deb 149/*
601ae7f2
BR		 150 * ieee80211_add_rx_radiotap_header - add radiotap header
151 *
152 * add a radiotap header containing all the fields which the hardware provided.
153 */
154static void
155ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
156 struct sk_buff *skb,
601ae7f2 157 struct ieee80211_rate *rate,
973ef21a 158 int rtap_len, bool has_fcs)
601ae7f2 159{
f1d58c25 160 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 161 struct ieee80211_radiotap_header *rthdr;
162 unsigned char *pos;
a144f378
JB		 163 __le32 *it_present;
164 u32 it_present_val;
6a86b9c7 165 u16 rx_flags = 0;
a5e70697 166 u16 channel_flags = 0;
a144f378
JB		 167 int mpdulen, chain;
168 unsigned long chains = status->chains;
1f7bba79
JB		 169 struct ieee80211_vendor_radiotap rtap = {};
170
171 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
172 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
173 /* rtap.len and rtap.pad are undone immediately */
174 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
175 }
f4bda337
TP		 176
177 mpdulen = skb->len;
178 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
179 mpdulen += FCS_LEN;
601ae7f2
BR		 180
181 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
1f7bba79 182 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
a144f378 183 it_present = &rthdr->it_present;
601ae7f2
BR		 184
185 /* radiotap header, set always present flags */
0059b2b1 186 rthdr->it_len = cpu_to_le16(rtap_len);
a144f378
JB		 187 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
188 BIT(IEEE80211_RADIOTAP_CHANNEL) |
189 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
190
191 if (!status->chains)
192 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
193
194 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
195 it_present_val |=
196 BIT(IEEE80211_RADIOTAP_EXT) |
197 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
198 put_unaligned_le32(it_present_val, it_present);
199 it_present++;
200 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
201 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
202 }
601ae7f2 203
1f7bba79
JB		 204 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
205 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
206 BIT(IEEE80211_RADIOTAP_EXT);
207 put_unaligned_le32(it_present_val, it_present);
208 it_present++;
209 it_present_val = rtap.present;
210 }
211
a144f378
JB		 212 put_unaligned_le32(it_present_val, it_present);
213
214 pos = (void *)(it_present + 1);
215
601ae7f2
BR		 216 /* the order of the following fields is important */
217
218 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 219 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 220 /* padding */
221 while ((pos - (u8 *)rthdr) & 7)
222 *pos++ = 0;
f4bda337
TP		 223 put_unaligned_le64(
224 ieee80211_calculate_rx_timestamp(local, status,
225 mpdulen, 0),
226 pos);
1df332e8 227 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 228 pos += 8;
229 }
230
231 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 232 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 233 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 234 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
235 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 236 if (status->flag & RX_FLAG_SHORTPRE)
237 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 238 pos++;
239
240 /* IEEE80211_RADIOTAP_RATE */
5614618e 241 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 242 /*
f8d1ccf1 243 * Without rate information don't add it. If we have,
38f37be2 244 * MCS information is a separate field in radiotap,
73b48099
JB		 245 * added below. The byte here is needed as padding
246 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 247 */
248 *pos = 0;
8d6f658e 249 } else {
2103dec1 250 int shift = 0;
ebe6c7ba 251 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2103dec1
SW		 252 if (status->flag & RX_FLAG_10MHZ)
253 shift = 1;
254 else if (status->flag & RX_FLAG_5MHZ)
255 shift = 2;
256 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
8d6f658e 257 }
601ae7f2
BR		 258 pos++;
259
260 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 261 put_unaligned_le16(status->freq, pos);
601ae7f2 262 pos += 2;
a5e70697
SW		 263 if (status->flag & RX_FLAG_10MHZ)
264 channel_flags |= IEEE80211_CHAN_HALF;
265 else if (status->flag & RX_FLAG_5MHZ)
266 channel_flags |= IEEE80211_CHAN_QUARTER;
267
601ae7f2 268 if (status->band == IEEE80211_BAND_5GHZ)
a5e70697 269 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
5614618e 270 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
a5e70697 271 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
f8d1ccf1 272 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
a5e70697 273 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 274 else if (rate)
a5e70697 275 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
f8d1ccf1 276 else
a5e70697
SW		 277 channel_flags |= IEEE80211_CHAN_2GHZ;
278 put_unaligned_le16(channel_flags, pos);
601ae7f2
BR		 279 pos += 2;
280
281 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 282 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
283 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 284 *pos = status->signal;
285 rthdr->it_present |=
286 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
287 pos++;
288 }
289
601ae7f2
BR		 290 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
291
a144f378
JB		 292 if (!status->chains) {
293 /* IEEE80211_RADIOTAP_ANTENNA */
294 *pos = status->antenna;
295 pos++;
296 }
601ae7f2 297
601ae7f2
BR		 298 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
299
300 /* IEEE80211_RADIOTAP_RX_FLAGS */
301 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 302 if ((pos - (u8 *)rthdr) & 1)
90b9e446 303 *pos++ = 0;
aae89831 304 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 305 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
306 put_unaligned_le16(rx_flags, pos);
601ae7f2 307 pos += 2;
6d744bac
JB		 308
309 if (status->flag & RX_FLAG_HT) {
786677d1
OR		 310 unsigned int stbc;
311
6d744bac 312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 313 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 314 *pos = 0;
315 if (status->flag & RX_FLAG_SHORT_GI)
316 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
317 if (status->flag & RX_FLAG_40MHZ)
318 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 319 if (status->flag & RX_FLAG_HT_GF)
320 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
63c361f5
EG		 321 if (status->flag & RX_FLAG_LDPC)
322 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
786677d1
OR		 323 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
324 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
6d744bac
JB		 325 pos++;
326 *pos++ = status->rate_idx;
327 }
4c298677
JB		 328
329 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
330 u16 flags = 0;
331
332 /* ensure 4 byte alignment */
333 while ((pos - (u8 *)rthdr) & 3)
334 pos++;
335 rthdr->it_present |=
336 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
337 put_unaligned_le32(status->ampdu_reference, pos);
338 pos += 4;
339 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
340 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
341 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
342 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
343 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
344 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
345 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
346 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
347 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
348 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
349 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
350 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
351 put_unaligned_le16(flags, pos);
352 pos += 2;
353 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
354 *pos++ = status->ampdu_delimiter_crc;
355 else
356 *pos++ = 0;
357 *pos++ = 0;
358 }
90b9e446 359
51648921
JB		 360 if (status->flag & RX_FLAG_VHT) {
361 u16 known = local->hw.radiotap_vht_details;
362
363 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
364 /* known field - how to handle 80+80? */
1b8d242a 365 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
51648921
JB		 366 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
367 put_unaligned_le16(known, pos);
368 pos += 2;
369 /* flags */
370 if (status->flag & RX_FLAG_SHORT_GI)
371 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
63c361f5
EG		 372 /* in VHT, STBC is binary */
373 if (status->flag & RX_FLAG_STBC_MASK)
374 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
fb378c23
EG		 375 if (status->vht_flag & RX_VHT_FLAG_BF)
376 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
51648921
JB		 377 pos++;
378 /* bandwidth */
1b8d242a 379 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
51648921 380 *pos++ = 4;
1b8d242a 381 else if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
51648921 382 *pos++ = 0; /* marked not known above */
1b8d242a 383 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
51648921
JB		 384 *pos++ = 11;
385 else if (status->flag & RX_FLAG_40MHZ)
386 *pos++ = 1;
387 else /* 20 MHz */
388 *pos++ = 0;
389 /* MCS/NSS */
390 *pos = (status->rate_idx << 4) | status->vht_nss;
391 pos += 4;
392 /* coding field */
63c361f5
EG		 393 if (status->flag & RX_FLAG_LDPC)
394 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
51648921
JB		 395 pos++;
396 /* group ID */
397 pos++;
398 /* partial_aid */
399 pos += 2;
400 }
401
a144f378
JB		 402 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
403 *pos++ = status->chain_signal[chain];
404 *pos++ = chain;
405 }
1f7bba79
JB		 406
407 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
408 /* ensure 2 byte alignment for the vendor field as required */
409 if ((pos - (u8 *)rthdr) & 1)
410 *pos++ = 0;
411 *pos++ = rtap.oui[0];
412 *pos++ = rtap.oui[1];
413 *pos++ = rtap.oui[2];
414 *pos++ = rtap.subns;
415 put_unaligned_le16(rtap.len, pos);
416 pos += 2;
417 /* align the actual payload as requested */
418 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
419 *pos++ = 0;
420 /* data (and possible padding) already follows */
421 }
601ae7f2
BR		 422}
423
b2e7771e
JB		 424/*
425 * This function copies a received frame to all monitor interfaces and
426 * returns a cleaned-up SKB that no longer includes the FCS nor the
427 * radiotap header the driver might have added.
428 */
429static struct sk_buff *
430ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 431 struct ieee80211_rate *rate)
b2e7771e 432{
f1d58c25 433 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 434 struct ieee80211_sub_if_data *sdata;
1f7bba79 435 int rt_hdrlen, needed_headroom;
b2e7771e
JB		 436 struct sk_buff *skb, *skb2;
437 struct net_device *prev_dev = NULL;
438 int present_fcs_len = 0;
1f7bba79
JB		 439 unsigned int rtap_vendor_space = 0;
440
441 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
442 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
443
444 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
445 }
b2e7771e
JB		 446
447 /*
448 * First, we may need to make a copy of the skb because
449 * (1) we need to modify it for radiotap (if not present), and
450 * (2) the other RX handlers will modify the skb we got.
451 *
452 * We don't need to, of course, if we aren't going to return
453 * the SKB because it has a bad FCS/PLCP checksum.
454 */
0869aea0 455
b2e7771e
JB		 456 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
457 present_fcs_len = FCS_LEN;
458
1f7bba79
JB		 459 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
460 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
e3cf8b3f
ZY		 461 dev_kfree_skb(origskb);
462 return NULL;
463 }
464
b2e7771e 465 if (!local->monitors) {
1f7bba79
JB		 466 if (should_drop_frame(origskb, present_fcs_len,
467 rtap_vendor_space)) {
b2e7771e
JB		 468 dev_kfree_skb(origskb);
469 return NULL;
470 }
471
1f7bba79 472 return remove_monitor_info(local, origskb, rtap_vendor_space);
b2e7771e
JB		 473 }
474
751413ea 475 /* room for the radiotap header based on driver features */
1f7bba79
JB		 476 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
477 needed_headroom = rt_hdrlen - rtap_vendor_space;
751413ea 478
1f7bba79 479 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
b2e7771e
JB		 480 /* only need to expand headroom if necessary */
481 skb = origskb;
482 origskb = NULL;
483
484 /*
485 * This shouldn't trigger often because most devices have an
486 * RX header they pull before we get here, and that should
487 * be big enough for our radiotap information. We should
488 * probably export the length to drivers so that we can have
489 * them allocate enough headroom to start with.
490 */
491 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 492 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 493 dev_kfree_skb(skb);
494 return NULL;
495 }
496 } else {
497 /*
498 * Need to make a copy and possibly remove radiotap header
499 * and FCS from the original.
500 */
501 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
502
1f7bba79
JB		 503 origskb = remove_monitor_info(local, origskb,
504 rtap_vendor_space);
b2e7771e
JB		 505
506 if (!skb)
507 return origskb;
508 }
509
0869aea0 510 /* prepend radiotap information */
1f7bba79 511 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
b2e7771e 512
ce3edf6d 513 skb_reset_mac_header(skb);
b2e7771e
JB		 514 skb->ip_summed = CHECKSUM_UNNECESSARY;
515 skb->pkt_type = PACKET_OTHERHOST;
516 skb->protocol = htons(ETH_P_802_2);
517
518 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 519 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 520 continue;
521
3d30d949
MW		 522 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
523 continue;
524
9607e6b6 525 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 526 continue;
527
b2e7771e
JB		 528 if (prev_dev) {
529 skb2 = skb_clone(skb, GFP_ATOMIC);
530 if (skb2) {
531 skb2->dev = prev_dev;
5548a8a1 532 netif_receive_skb(skb2);
b2e7771e
JB		 533 }
534 }
535
536 prev_dev = sdata->dev;
537 sdata->dev->stats.rx_packets++;
538 sdata->dev->stats.rx_bytes += skb->len;
539 }
540
541 if (prev_dev) {
542 skb->dev = prev_dev;
5548a8a1 543 netif_receive_skb(skb);
b2e7771e
JB		 544 } else
545 dev_kfree_skb(skb);
546
547 return origskb;
548}
549
5cf121c3 550static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 551{
238f74a2 552 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 553 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 554 int tid, seqno_idx, security_idx;
6e0d114d
JB		 555
556 /* does the frame have a qos control field? */
238f74a2
HH		 557 if (ieee80211_is_data_qos(hdr->frame_control)) {
558 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 559 /* frame has qos control */
238f74a2 560 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 561 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 562 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 563
564 seqno_idx = tid;
565 security_idx = tid;
6e0d114d 566 } else {
1411f9b5
JB		 567 /*
568 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
569 *
570 * Sequence numbers for management frames, QoS data
571 * frames with a broadcast/multicast address in the
572 * Address 1 field, and all non-QoS data frames sent
573 * by QoS STAs are assigned using an additional single
574 * modulo-4096 counter, [...]
575 *
576 * We also use that counter for non-QoS STAs.
577 */
5a306f58 578 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 579 security_idx = 0;
580 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 581 security_idx = IEEE80211_NUM_TIDS;
9e26297a 582 tid = 0;
6e0d114d 583 }
52865dfd 584
9e26297a
JB		 585 rx->seqno_idx = seqno_idx;
586 rx->security_idx = security_idx;
6e0d114d
JB		 587 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
588 * For now, set skb->priority to 0 for other cases. */
589 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 590}
6e0d114d 591
d1c3a37c
JB		 592/**
593 * DOC: Packet alignment
594 *
595 * Drivers always need to pass packets that are aligned to two-byte boundaries
596 * to the stack.
597 *
598 * Additionally, should, if possible, align the payload data in a way that
599 * guarantees that the contained IP header is aligned to a four-byte
600 * boundary. In the case of regular frames, this simply means aligning the
601 * payload to a four-byte boundary (because either the IP header is directly
602 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 603 * in front of it). If the payload data is not properly aligned and the
604 * architecture doesn't support efficient unaligned operations, mac80211
605 * will align the data.
d1c3a37c
JB		 606 *
607 * With A-MSDU frames, however, the payload data address must yield two modulo
608 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
609 * push the IP header further back to a multiple of four again. Thankfully, the
610 * specs were sane enough this time around to require padding each A-MSDU
611 * subframe to a length that is a multiple of four.
612 *
25985edc 613 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 614 * the payload is not supported, the driver is required to move the 802.11
615 * header to be directly in front of the payload in that case.
616 */
617static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 618{
59d9cb07
KV		 619#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
620 WARN_ONCE((unsigned long)rx->skb->data & 1,
621 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 622#endif
6e0d114d
JB		 623}
624
6368e4b1 625
571ecf67
JB		 626/* rx handlers */
627
3cfcf6ac
JM		 628static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
629{
630 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
631
d8ca16db 632 if (is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 633 return 0;
634
d8ca16db 635 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 636}
637
638
639static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
640{
641 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
642
d8ca16db 643 if (!is_multicast_ether_addr(hdr->addr1))
3cfcf6ac
JM		 644 return 0;
645
d8ca16db 646 return ieee80211_is_robust_mgmt_frame(skb);
3cfcf6ac
JM		 647}
648
649
650/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
651static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
652{
653 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
654 struct ieee80211_mmie *mmie;
655
1df332e8 656 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 657 return -1;
658
d8ca16db 659 if (!ieee80211_is_robust_mgmt_frame(skb))
3cfcf6ac
JM		 660 return -1; /* not a robust management frame */
661
662 mmie = (struct ieee80211_mmie *)
663 (skb->data + skb->len - sizeof(*mmie));
664 if (mmie->element_id != WLAN_EID_MMIE ||
665 mmie->length != sizeof(*mmie) - 2)
666 return -1;
667
668 return le16_to_cpu(mmie->key_id);
669}
670
2475b1cc
MS		 671static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
672 struct sk_buff *skb)
673{
674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
675 __le16 fc;
676 int hdrlen;
677 u8 keyid;
678
679 fc = hdr->frame_control;
680 hdrlen = ieee80211_hdrlen(fc);
681
682 if (skb->len < hdrlen + cs->hdr_len)
683 return -EINVAL;
684
685 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
686 keyid &= cs->key_idx_mask;
687 keyid >>= cs->key_idx_shift;
688
689 return keyid;
690}
691
1df332e8 692static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 693{
a7767f95 694 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 695 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 696
a7767f95 697 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 698 if (is_multicast_ether_addr(hdr->addr1)) {
699 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 700 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 701 return RX_DROP_MONITOR;
b203ca39 702 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 703 return RX_DROP_MONITOR;
704 } else {
705 if (!ieee80211_has_a4(hdr->frame_control))
706 return RX_DROP_MONITOR;
b203ca39 707 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 708 return RX_DROP_MONITOR;
709 }
33b64eb2
LCC		 710 }
711
712 /* If there is not an established peer link and this is not a peer link
713 * establisment frame, beacon or probe, drop the frame.
714 */
715
57cf8043 716 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 717 struct ieee80211_mgmt *mgmt;
d6d1a5a7 718
a7767f95 719 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 720 return RX_DROP_MONITOR;
721
a7767f95 722 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 723 u8 category;
9b395bc3
JB		 724
725 /* make sure category field is present */
726 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
727 return RX_DROP_MONITOR;
728
33b64eb2 729 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 730 category = mgmt->u.action.category;
731 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 732 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 733 return RX_DROP_MONITOR;
33b64eb2 734 return RX_CONTINUE;
33b64eb2
LCC		 735 }
736
a7767f95
HH		 737 if (ieee80211_is_probe_req(hdr->frame_control) ||
738 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 739 ieee80211_is_beacon(hdr->frame_control) ||
740 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 741 return RX_CONTINUE;
742
743 return RX_DROP_MONITOR;
a7767f95
HH		 744 }
745
902acc78
JB		 746 return RX_CONTINUE;
747}
33b64eb2 748
d3b2fb53 749static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 750 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 751 int index,
752 struct sk_buff_head *frames)
1edfb1af 753{
83eb935e
MK		 754 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
755 struct sk_buff *skb;
4cfda47b 756 struct ieee80211_rx_status *status;
1edfb1af 757
dd318575
JB		 758 lockdep_assert_held(&tid_agg_rx->reorder_lock);
759
83eb935e 760 if (skb_queue_empty(skb_list))
1edfb1af
JB		 761 goto no_frame;
762
83eb935e
MK		 763 if (!ieee80211_rx_reorder_ready(skb_list)) {
764 __skb_queue_purge(skb_list);
765 goto no_frame;
766 }
767
768 /* release frames from the reorder ring buffer */
1edfb1af 769 tid_agg_rx->stored_mpdu_num--;
83eb935e
MK		 770 while ((skb = __skb_dequeue(skb_list))) {
771 status = IEEE80211_SKB_RXCB(skb);
772 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
773 __skb_queue_tail(frames, skb);
774 }
1edfb1af
JB		 775
776no_frame:
9a886586 777 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 778}
779
d3b2fb53 780static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 781 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 782 u16 head_seq_num,
783 struct sk_buff_head *frames)
1edfb1af
JB		 784{
785 int index;
786
dd318575
JB		 787 lockdep_assert_held(&tid_agg_rx->reorder_lock);
788
9a886586 789 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2e3049b7 790 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
f9e124fb
CL		 791 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
792 frames);
1edfb1af
JB		 793 }
794}
795
796/*
797 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
798 * the skb was added to the buffer longer than this time ago, the earlier
799 * frames that have not yet been received are assumed to be lost and the skb
800 * can be released for processing. This may also release other skb's from the
801 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 802 *
803 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 804 */
805#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
806
d3b2fb53 807static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 808 struct tid_ampdu_rx *tid_agg_rx,
809 struct sk_buff_head *frames)
aa0c8636 810{
83eb935e 811 int index, i, j;
aa0c8636 812
dd318575
JB		 813 lockdep_assert_held(&tid_agg_rx->reorder_lock);
814
aa0c8636 815 /* release the buffer until next missing frame */
2e3049b7 816 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
83eb935e 817 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
07ae2dfc 818 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 819 /*
820 * No buffers ready to be released, but check whether any
821 * frames in the reorder buffer have timed out.
822 */
aa0c8636
CL		 823 int skipped = 1;
824 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
825 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 826 if (!ieee80211_rx_reorder_ready(
827 &tid_agg_rx->reorder_buf[j])) {
aa0c8636
CL		 828 skipped++;
829 continue;
830 }
499fe9a4
DH		 831 if (skipped &&
832 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 833 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 834 goto set_release_timer;
aa0c8636 835
83eb935e
MK		 836 /* don't leave incomplete A-MSDUs around */
837 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
838 i = (i + 1) % tid_agg_rx->buf_size)
839 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
840
bdcbd8e0
JB		 841 ht_dbg_ratelimited(sdata,
842 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 843 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
844 frames);
aa0c8636
CL		 845
846 /*
847 * Increment the head seq# also for the skipped slots.
848 */
849 tid_agg_rx->head_seq_num =
9a886586
JB		 850 (tid_agg_rx->head_seq_num +
851 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 852 skipped = 0;
853 }
83eb935e
MK		 854 } else while (ieee80211_rx_reorder_ready(
855 &tid_agg_rx->reorder_buf[index])) {
f9e124fb
CL		 856 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
857 frames);
2e3049b7 858 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
aa0c8636 859 }
2bff8ebf
CL		 860
861 if (tid_agg_rx->stored_mpdu_num) {
2e3049b7 862 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
2bff8ebf
CL		 863
864 for (; j != (index - 1) % tid_agg_rx->buf_size;
865 j = (j + 1) % tid_agg_rx->buf_size) {
83eb935e
MK		 866 if (ieee80211_rx_reorder_ready(
867 &tid_agg_rx->reorder_buf[j]))
2bff8ebf
CL		 868 break;
869 }
870
871 set_release_timer:
872
873 mod_timer(&tid_agg_rx->reorder_timer,
334df731 874 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 875 HT_RX_REORDER_BUF_TIMEOUT);
876 } else {
877 del_timer(&tid_agg_rx->reorder_timer);
878 }
aa0c8636
CL		 879}
880
1edfb1af
JB		 881/*
882 * As this function belongs to the RX path it must be under
883 * rcu_read_lock protection. It returns false if the frame
884 * can be processed immediately, true if it was consumed.
885 */
d3b2fb53 886static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 887 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 888 struct sk_buff *skb,
889 struct sk_buff_head *frames)
1edfb1af
JB		 890{
891 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
83eb935e 892 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1edfb1af
JB		 893 u16 sc = le16_to_cpu(hdr->seq_ctrl);
894 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
895 u16 head_seq_num, buf_size;
896 int index;
2bff8ebf 897 bool ret = true;
1edfb1af 898
dd318575
JB		 899 spin_lock(&tid_agg_rx->reorder_lock);
900
4549cf2b
MK		 901 /*
902 * Offloaded BA sessions have no known starting sequence number so pick
903 * one from first Rxed frame for this tid after BA was started.
904 */
905 if (unlikely(tid_agg_rx->auto_seq)) {
906 tid_agg_rx->auto_seq = false;
907 tid_agg_rx->ssn = mpdu_seq_num;
908 tid_agg_rx->head_seq_num = mpdu_seq_num;
909 }
910
1edfb1af
JB		 911 buf_size = tid_agg_rx->buf_size;
912 head_seq_num = tid_agg_rx->head_seq_num;
913
914 /* frame with out of date sequence number */
9a886586 915 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 916 dev_kfree_skb(skb);
2bff8ebf 917 goto out;
1edfb1af
JB		 918 }
919
920 /*
921 * If frame the sequence number exceeds our buffering window
922 * size release some previous frames to make room for this one.
923 */
9a886586
JB		 924 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
925 head_seq_num = ieee80211_sn_inc(
926 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 927 /* release stored frames up to new head to stack */
d3b2fb53 928 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 929 head_seq_num, frames);
1edfb1af
JB		 930 }
931
932 /* Now the new frame is always in the range of the reordering buffer */
933
2e3049b7 934 index = mpdu_seq_num % tid_agg_rx->buf_size;
1edfb1af
JB		 935
936 /* check if we already stored this frame */
83eb935e 937 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
1edfb1af 938 dev_kfree_skb(skb);
2bff8ebf 939 goto out;
1edfb1af
JB		 940 }
941
942 /*
943 * If the current MPDU is in the right order and nothing else
944 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 945 * If it is first but there's something stored, we may be able
946 * to release frames after this one.
1edfb1af
JB		 947 */
948 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
949 tid_agg_rx->stored_mpdu_num == 0) {
83eb935e
MK		 950 if (!(status->flag & RX_FLAG_AMSDU_MORE))
951 tid_agg_rx->head_seq_num =
952 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 953 ret = false;
954 goto out;
1edfb1af
JB		 955 }
956
957 /* put the frame in the reordering buffer */
83eb935e
MK		 958 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
959 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
960 tid_agg_rx->reorder_time[index] = jiffies;
961 tid_agg_rx->stored_mpdu_num++;
962 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
963 }
1edfb1af 964
2bff8ebf
CL		 965 out:
966 spin_unlock(&tid_agg_rx->reorder_lock);
967 return ret;
1edfb1af
JB		 968}
969
970/*
971 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
972 * true if the MPDU was buffered, false if it should be processed.
973 */
f9e124fb
CL		 974static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
975 struct sk_buff_head *frames)
1edfb1af 976{
2569a826
JB		 977 struct sk_buff *skb = rx->skb;
978 struct ieee80211_local *local = rx->local;
1edfb1af 979 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 980 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 981 struct sta_info *sta = rx->sta;
1edfb1af
JB		 982 struct tid_ampdu_rx *tid_agg_rx;
983 u16 sc;
6cc00d54 984 u8 tid, ack_policy;
1edfb1af 985
051a41fa
JB		 986 if (!ieee80211_is_data_qos(hdr->frame_control) ||
987 is_multicast_ether_addr(hdr->addr1))
2569a826 988 goto dont_reorder;
1edfb1af
JB		 989
990 /*
991 * filter the QoS data rx stream according to
992 * STA/TID and check if this STA/TID is on aggregation
993 */
994
1edfb1af 995 if (!sta)
2569a826 996 goto dont_reorder;
1edfb1af 997
6cc00d54
TP		 998 ack_policy = *ieee80211_get_qos_ctl(hdr) &
999 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 1000 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1001
a87f736d
JB		 1002 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1003 if (!tid_agg_rx)
1004 goto dont_reorder;
1edfb1af
JB		 1005
1006 /* qos null data frames are excluded */
1007 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 1008 goto dont_reorder;
1edfb1af 1009
6cc00d54
TP		 1010 /* not part of a BA session */
1011 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1012 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1013 goto dont_reorder;
1014
660c6a44
TP		 1015 /* not actually part of this BA session */
1016 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1017 goto dont_reorder;
1018
1edfb1af
JB		 1019 /* new, potentially un-ordered, ampdu frame - process it */
1020
1021 /* reset session timer */
1022 if (tid_agg_rx->timeout)
12d3952f 1023 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 1024
1025 /* if this mpdu is fragmented - terminate rx aggregation session */
1026 sc = le16_to_cpu(hdr->seq_ctrl);
1027 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 1028 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 1029 skb_queue_tail(&rx->sdata->skb_queue, skb);
1030 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 1031 return;
1edfb1af
JB		 1032 }
1033
a87f736d
JB		 1034 /*
1035 * No locking needed -- we will only ever process one
1036 * RX packet at a time, and thus own tid_agg_rx. All
1037 * other code manipulating it needs to (and does) make
1038 * sure that we cannot get to it any more before doing
1039 * anything with it.
1040 */
f9e124fb
CL		 1041 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1042 frames))
2569a826
JB		 1043 return;
1044
1045 dont_reorder:
f9e124fb 1046 __skb_queue_tail(frames, skb);
1edfb1af 1047}
33b64eb2 1048
49461622 1049static ieee80211_rx_result debug_noinline
5cf121c3 1050ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 1051{
a7767f95 1052 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 1053 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1054
6b0f3274
JB		 1055 /*
1056 * Drop duplicate 802.11 retransmissions
1057 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1058 */
1059 if (rx->skb->len >= 24 && rx->sta &&
1060 !ieee80211_is_ctl(hdr->frame_control) &&
1061 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1062 !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 1063 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 1064 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 1065 hdr->seq_ctrl)) {
554891e6 1066 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 1067 rx->local->dot11FrameDuplicateCount++;
1068 rx->sta->num_duplicates++;
1069 }
b1f93314 1070 return RX_DROP_UNUSABLE;
0cfcefef 1071 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
9e26297a 1072 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
0cfcefef 1073 }
571ecf67
JB		 1074 }
1075
571ecf67
JB		 1076 if (unlikely(rx->skb->len < 16)) {
1077 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 1078 return RX_DROP_MONITOR;
571ecf67
JB		 1079 }
1080
571ecf67
JB		 1081 /* Drop disallowed frame classes based on STA auth/assoc state;
1082 * IEEE 802.11, Chap 5.5.
1083 *
ccd7b362
JB		 1084 * mac80211 filters only based on association state, i.e. it drops
1085 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 1086 * deauth/disassoc frames when needed. In addition, hostapd is
1087 * responsible for filtering on both auth and assoc states.
1088 */
33b64eb2 1089
902acc78 1090 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 1091 return ieee80211_rx_mesh_check(rx);
33b64eb2 1092
a7767f95
HH		 1093 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1094 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 1095 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 1096 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
239281f8 1097 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
c2c98fde 1098 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 1099 /*
1100 * accept port control frames from the AP even when it's not
1101 * yet marked ASSOC to prevent a race where we don't set the
1102 * assoc bit quickly enough before it sends the first frame
1103 */
1104 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 1105 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 1106 unsigned int hdrlen;
1107 __be16 ethertype;
1108
1109 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1110
1111 if (rx->skb->len < hdrlen + 8)
1112 return RX_DROP_MONITOR;
1113
1114 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1115 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 1116 return RX_CONTINUE;
1117 }
21fc7560
JB		 1118
1119 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1120 cfg80211_rx_spurious_frame(rx->sdata->dev,
1121 hdr->addr2,
1122 GFP_ATOMIC))
1123 return RX_DROP_UNUSABLE;
1124
e4c26add 1125 return RX_DROP_MONITOR;
2a33bee2 1126 }
571ecf67 1127
9ae54c84 1128 return RX_CONTINUE;
570bd537
JB		 1129}
1130
1131
572e0012
KV		 1132static ieee80211_rx_result debug_noinline
1133ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1134{
1135 struct ieee80211_local *local;
1136 struct ieee80211_hdr *hdr;
1137 struct sk_buff *skb;
1138
1139 local = rx->local;
1140 skb = rx->skb;
1141 hdr = (struct ieee80211_hdr *) skb->data;
1142
1143 if (!local->pspolling)
1144 return RX_CONTINUE;
1145
1146 if (!ieee80211_has_fromds(hdr->frame_control))
1147 /* this is not from AP */
1148 return RX_CONTINUE;
1149
1150 if (!ieee80211_is_data(hdr->frame_control))
1151 return RX_CONTINUE;
1152
1153 if (!ieee80211_has_moredata(hdr->frame_control)) {
1154 /* AP has no more frames buffered for us */
1155 local->pspolling = false;
1156 return RX_CONTINUE;
1157 }
1158
1159 /* more data bit is set, let's request a new frame from the AP */
1160 ieee80211_send_pspoll(local, rx->sdata);
1161
1162 return RX_CONTINUE;
1163}
1164
d012a605 1165static void sta_ps_start(struct sta_info *sta)
571ecf67 1166{
133b8226 1167 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1168 struct ieee80211_local *local = sdata->local;
d012a605 1169 struct ps_data *ps;
0795af57 1170
d012a605
MP		 1171 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1172 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1173 ps = &sdata->bss->ps;
1174 else
1175 return;
1176
1177 atomic_inc(&ps->num_sta_ps);
c2c98fde 1178 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1179 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1180 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1181 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1182 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1183}
1184
d012a605 1185static void sta_ps_end(struct sta_info *sta)
571ecf67 1186{
bdcbd8e0
JB		 1187 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1188 sta->sta.addr, sta->sta.aid);
004c872e 1189
c2c98fde 1190 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
e3685e03
JB		 1191 /*
1192 * Clear the flag only if the other one is still set
1193 * so that the TX path won't start TX'ing new frames
1194 * directly ... In the case that the driver flag isn't
1195 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1196 */
1197 clear_sta_flag(sta, WLAN_STA_PS_STA);
bdcbd8e0
JB		 1198 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1199 sta->sta.addr, sta->sta.aid);
af818581
JB		 1200 return;
1201 }
1202
5ac2e350
JB		 1203 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1204 clear_sta_flag(sta, WLAN_STA_PS_STA);
af818581 1205 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1206}
1207
d057e5a3
AN		 1208int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1209{
1210 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1211 bool in_ps;
1212
1213 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1214
1215 /* Don't let the same PS state be set twice */
c2c98fde 1216 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1217 if ((start && in_ps) || (!start && !in_ps))
1218 return -EINVAL;
1219
1220 if (start)
d012a605 1221 sta_ps_start(sta_inf);
d057e5a3 1222 else
d012a605 1223 sta_ps_end(sta_inf);
d057e5a3
AN		 1224
1225 return 0;
1226}
1227EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1228
47086fc5
JB		 1229static ieee80211_rx_result debug_noinline
1230ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1231{
1232 struct ieee80211_sub_if_data *sdata = rx->sdata;
1233 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1234 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1235 int tid, ac;
1236
1237 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1238 return RX_CONTINUE;
1239
1240 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1241 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1242 return RX_CONTINUE;
1243
1244 /*
1245 * The device handles station powersave, so don't do anything about
1246 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1247 * it to mac80211 since they're handled.)
1248 */
1249 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1250 return RX_CONTINUE;
1251
1252 /*
1253 * Don't do anything if the station isn't already asleep. In
1254 * the uAPSD case, the station will probably be marked asleep,
1255 * in the PS-Poll case the station must be confused ...
1256 */
c2c98fde 1257 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1258 return RX_CONTINUE;
1259
1260 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1261 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1262 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1263 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1264 else
c2c98fde 1265 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1266 }
47086fc5
JB		 1267
1268 /* Free PS Poll skb here instead of returning RX_DROP that would
1269 * count as an dropped frame. */
1270 dev_kfree_skb(rx->skb);
1271
1272 return RX_QUEUED;
1273 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1274 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1275 ieee80211_has_pm(hdr->frame_control) &&
1276 (ieee80211_is_data_qos(hdr->frame_control) ||
1277 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1278 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1279 ac = ieee802_1d_to_ac[tid & 7];
1280
1281 /*
1282 * If this AC is not trigger-enabled do nothing.
1283 *
1284 * NB: This could/should check a separate bitmap of trigger-
1285 * enabled queues, but for now we only implement uAPSD w/o
1286 * TSPEC changes to the ACs, so they're always the same.
1287 */
1288 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1289 return RX_CONTINUE;
1290
1291 /* if we are in a service period, do nothing */
c2c98fde 1292 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1293 return RX_CONTINUE;
1294
c2c98fde 1295 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1296 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1297 else
c2c98fde 1298 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1299 }
1300
1301 return RX_CONTINUE;
1302}
1303
49461622 1304static ieee80211_rx_result debug_noinline
5cf121c3 1305ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1306{
1307 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1308 struct sk_buff *skb = rx->skb;
1309 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1310 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
ef0621e8 1311 int i;
571ecf67
JB		 1312
1313 if (!sta)
9ae54c84 1314 return RX_CONTINUE;
571ecf67 1315
b291ba11
JB		 1316 /*
1317 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1318 * BSSID and for station already AUTHORIZED to avoid keeping the
1319 * current IBSS network alive in cases where other STAs start
1320 * using different BSSID. This will also give the station another
1321 * chance to restart the authentication/authorization in case
1322 * something went wrong the first time.
b291ba11 1323 */
05c914fe 1324 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1325 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1326 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1327 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1328 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1329 sta->last_rx = jiffies;
f4ebddf9
HR		 1330 if (ieee80211_is_data(hdr->frame_control) &&
1331 !is_multicast_ether_addr(hdr->addr1)) {
3af6334c
FF		 1332 sta->last_rx_rate_idx = status->rate_idx;
1333 sta->last_rx_rate_flag = status->flag;
1b8d242a 1334 sta->last_rx_rate_vht_flag = status->vht_flag;
5614618e 1335 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1336 }
1337 }
239281f8
RL		 1338 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
1339 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
1340 NL80211_IFTYPE_OCB);
1341 /* OCB uses wild-card BSSID */
1342 if (is_broadcast_ether_addr(bssid))
1343 sta->last_rx = jiffies;
b291ba11
JB		 1344 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1345 /*
33b64eb2
LCC		 1346 * Mesh beacons will update last_rx when if they are found to
1347 * match the current local configuration when processed.
571ecf67 1348 */
b291ba11 1349 sta->last_rx = jiffies;
3af6334c
FF		 1350 if (ieee80211_is_data(hdr->frame_control)) {
1351 sta->last_rx_rate_idx = status->rate_idx;
1352 sta->last_rx_rate_flag = status->flag;
b8ff416b 1353 sta->last_rx_rate_vht_flag = status->vht_flag;
5614618e 1354 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1355 }
571ecf67
JB		 1356 }
1357
554891e6 1358 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1359 return RX_CONTINUE;
571ecf67 1360
3cf335d5
KV		 1361 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1362 ieee80211_sta_rx_notify(rx->sdata, hdr);
1363
571ecf67
JB		 1364 sta->rx_fragments++;
1365 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1366 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1367 sta->last_signal = status->signal;
1368 ewma_add(&sta->avg_signal, -status->signal);
1369 }
571ecf67 1370
ef0621e8
FF		 1371 if (status->chains) {
1372 sta->chains = status->chains;
1373 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1374 int signal = status->chain_signal[i];
1375
1376 if (!(status->chains & BIT(i)))
1377 continue;
1378
1379 sta->chain_signal_last[i] = signal;
1380 ewma_add(&sta->chain_signal_avg[i], -signal);
1381 }
1382 }
1383
72eaa43a
JB		 1384 /*
1385 * Change STA power saving mode only at the end of a frame
1386 * exchange sequence.
1387 */
d057e5a3
AN		 1388 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1389 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1390 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe 1391 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
b4ba544c
JB		 1392 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1393 /* PM bit is only checked in frames where it isn't reserved,
1394 * in AP mode it's reserved in non-bufferable management frames
1395 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1396 */
1397 (!ieee80211_is_mgmt(hdr->frame_control) ||
1398 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
c2c98fde 1399 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
b4ba544c 1400 if (!ieee80211_has_pm(hdr->frame_control))
d012a605 1401 sta_ps_end(sta);
72eaa43a
JB		 1402 } else {
1403 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1404 sta_ps_start(sta);
72eaa43a 1405 }
571ecf67
JB		 1406 }
1407
3f52b7e3
MP		 1408 /* mesh power save support */
1409 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1410 ieee80211_mps_rx_h_sta_process(sta, hdr);
1411
22403def
JB		 1412 /*
1413 * Drop (qos-)data::nullfunc frames silently, since they
1414 * are used only to control station power saving mode.
1415 */
1416 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1417 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1418 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1419
1420 /*
1421 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1422 * that was not moved to a 4-addr STA vlan yet send
1423 * the event to userspace and for older hostapd drop
1424 * the frame to the monitor interface.
d524215f
FF		 1425 */
1426 if (ieee80211_has_a4(hdr->frame_control) &&
1427 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1428 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1429 !rx->sdata->u.vlan.sta))) {
1430 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1431 cfg80211_rx_unexpected_4addr_frame(
1432 rx->sdata->dev, sta->sta.addr,
1433 GFP_ATOMIC);
d524215f 1434 return RX_DROP_MONITOR;
e7f4a940 1435 }
22403def
JB		 1436 /*
1437 * Update counter and free packet here to avoid
1438 * counting this as a dropped packed.
1439 */
571ecf67
JB		 1440 sta->rx_packets++;
1441 dev_kfree_skb(rx->skb);
9ae54c84 1442 return RX_QUEUED;
571ecf67
JB		 1443 }
1444
9ae54c84 1445 return RX_CONTINUE;
571ecf67
JB		 1446} /* ieee80211_rx_h_sta_process */
1447
86c228a7
JA		 1448static ieee80211_rx_result debug_noinline
1449ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1450{
1451 struct sk_buff *skb = rx->skb;
1452 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1454 int keyidx;
1455 int hdrlen;
1456 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1457 struct ieee80211_key *sta_ptk = NULL;
1458 int mmie_keyidx = -1;
1459 __le16 fc;
2475b1cc 1460 const struct ieee80211_cipher_scheme *cs = NULL;
86c228a7
JA		 1461
1462 /*
1463 * Key selection 101
1464 *
1465 * There are four types of keys:
1466 * - GTK (group keys)
1467 * - IGTK (group keys for management frames)
1468 * - PTK (pairwise keys)
1469 * - STK (station-to-station pairwise keys)
1470 *
1471 * When selecting a key, we have to distinguish between multicast
1472 * (including broadcast) and unicast frames, the latter can only
1473 * use PTKs and STKs while the former always use GTKs and IGTKs.
1474 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1475 * unicast frames can also use key indices like GTKs. Hence, if we
1476 * don't have a PTK/STK we check the key index for a WEP key.
1477 *
1478 * Note that in a regular BSS, multicast frames are sent by the
1479 * AP only, associated stations unicast the frame to the AP first
1480 * which then multicasts it on their behalf.
1481 *
1482 * There is also a slight problem in IBSS mode: GTKs are negotiated
1483 * with each station, that is something we don't currently handle.
1484 * The spec seems to expect that one negotiates the same key with
1485 * every station but there's no such requirement; VLANs could be
1486 * possible.
1487 */
1488
1489 /*
1490 * No point in finding a key and decrypting if the frame is neither
1491 * addressed to us nor a multicast frame.
1492 */
1493 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1494 return RX_CONTINUE;
1495
1496 /* start without a key */
1497 rx->key = NULL;
2475b1cc 1498 fc = hdr->frame_control;
86c228a7 1499
2475b1cc
MS		 1500 if (rx->sta) {
1501 int keyid = rx->sta->ptk_idx;
86c228a7 1502
2475b1cc
MS		 1503 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1504 cs = rx->sta->cipher_scheme;
1505 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1506 if (unlikely(keyid < 0))
1507 return RX_DROP_UNUSABLE;
1508 }
1509 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1510 }
86c228a7
JA		 1511
1512 if (!ieee80211_has_protected(fc))
1513 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1514
1515 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1516 rx->key = sta_ptk;
1517 if ((status->flag & RX_FLAG_DECRYPTED) &&
1518 (status->flag & RX_FLAG_IV_STRIPPED))
1519 return RX_CONTINUE;
1520 /* Skip decryption if the frame is not protected. */
1521 if (!ieee80211_has_protected(fc))
1522 return RX_CONTINUE;
1523 } else if (mmie_keyidx >= 0) {
1524 /* Broadcast/multicast robust management frame / BIP */
1525 if ((status->flag & RX_FLAG_DECRYPTED) &&
1526 (status->flag & RX_FLAG_IV_STRIPPED))
1527 return RX_CONTINUE;
1528
1529 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1530 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1531 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1532 if (rx->sta)
1533 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1534 if (!rx->key)
1535 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1536 } else if (!ieee80211_has_protected(fc)) {
1537 /*
1538 * The frame was not protected, so skip decryption. However, we
1539 * need to set rx->key if there is a key that could have been
1540 * used so that the frame may be dropped if encryption would
1541 * have been expected.
1542 */
1543 struct ieee80211_key *key = NULL;
1544 struct ieee80211_sub_if_data *sdata = rx->sdata;
1545 int i;
1546
1547 if (ieee80211_is_mgmt(fc) &&
1548 is_multicast_ether_addr(hdr->addr1) &&
1549 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1550 rx->key = key;
1551 else {
1552 if (rx->sta) {
1553 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1554 key = rcu_dereference(rx->sta->gtk[i]);
1555 if (key)
1556 break;
1557 }
1558 }
1559 if (!key) {
1560 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1561 key = rcu_dereference(sdata->keys[i]);
1562 if (key)
1563 break;
1564 }
1565 }
1566 if (key)
1567 rx->key = key;
1568 }
1569 return RX_CONTINUE;
1570 } else {
1571 u8 keyid;
2475b1cc 1572
86c228a7
JA		 1573 /*
1574 * The device doesn't give us the IV so we won't be
1575 * able to look up the key. That's ok though, we
1576 * don't need to decrypt the frame, we just won't
1577 * be able to keep statistics accurate.
1578 * Except for key threshold notifications, should
1579 * we somehow allow the driver to tell us which key
1580 * the hardware used if this flag is set?
1581 */
1582 if ((status->flag & RX_FLAG_DECRYPTED) &&
1583 (status->flag & RX_FLAG_IV_STRIPPED))
1584 return RX_CONTINUE;
1585
1586 hdrlen = ieee80211_hdrlen(fc);
1587
2475b1cc
MS		 1588 if (cs) {
1589 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
86c228a7 1590
2475b1cc
MS		 1591 if (unlikely(keyidx < 0))
1592 return RX_DROP_UNUSABLE;
1593 } else {
1594 if (rx->skb->len < 8 + hdrlen)
1595 return RX_DROP_UNUSABLE; /* TODO: count this? */
1596 /*
1597 * no need to call ieee80211_wep_get_keyidx,
1598 * it verifies a bunch of things we've done already
1599 */
1600 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1601 keyidx = keyid >> 6;
1602 }
86c228a7
JA		 1603
1604 /* check per-station GTK first, if multicast packet */
1605 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1606 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1607
1608 /* if not found, try default key */
1609 if (!rx->key) {
1610 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1611
1612 /*
1613 * RSNA-protected unicast frames should always be
1614 * sent with pairwise or station-to-station keys,
1615 * but for WEP we allow using a key index as well.
1616 */
1617 if (rx->key &&
1618 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1619 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1620 !is_multicast_ether_addr(hdr->addr1))
1621 rx->key = NULL;
1622 }
1623 }
1624
1625 if (rx->key) {
1626 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1627 return RX_DROP_MONITOR;
1628
1629 rx->key->tx_rx_count++;
1630 /* TODO: add threshold stuff again */
1631 } else {
1632 return RX_DROP_MONITOR;
1633 }
1634
1635 switch (rx->key->conf.cipher) {
1636 case WLAN_CIPHER_SUITE_WEP40:
1637 case WLAN_CIPHER_SUITE_WEP104:
1638 result = ieee80211_crypto_wep_decrypt(rx);
1639 break;
1640 case WLAN_CIPHER_SUITE_TKIP:
1641 result = ieee80211_crypto_tkip_decrypt(rx);
1642 break;
1643 case WLAN_CIPHER_SUITE_CCMP:
1644 result = ieee80211_crypto_ccmp_decrypt(rx);
1645 break;
1646 case WLAN_CIPHER_SUITE_AES_CMAC:
1647 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1648 break;
1649 default:
2475b1cc 1650 result = ieee80211_crypto_hw_decrypt(rx);
86c228a7
JA		 1651 }
1652
1653 /* the hdr variable is invalid after the decrypt handlers */
1654
1655 /* either the frame has been decrypted or will be dropped */
1656 status->flag |= RX_FLAG_DECRYPTED;
1657
1658 return result;
1659}
1660
571ecf67
JB		 1661static inline struct ieee80211_fragment_entry *
1662ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1663 unsigned int frag, unsigned int seq, int rx_queue,
1664 struct sk_buff **skb)
1665{
1666 struct ieee80211_fragment_entry *entry;
571ecf67 1667
571ecf67
JB		 1668 entry = &sdata->fragments[sdata->fragment_next++];
1669 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1670 sdata->fragment_next = 0;
1671
bdcbd8e0 1672 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1673 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1674
1675 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1676 *skb = NULL;
1677 entry->first_frag_time = jiffies;
1678 entry->seq = seq;
1679 entry->rx_queue = rx_queue;
1680 entry->last_frag = frag;
1681 entry->ccmp = 0;
1682 entry->extra_len = 0;
1683
1684 return entry;
1685}
1686
1687static inline struct ieee80211_fragment_entry *
1688ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1689 unsigned int frag, unsigned int seq,
571ecf67
JB		 1690 int rx_queue, struct ieee80211_hdr *hdr)
1691{
1692 struct ieee80211_fragment_entry *entry;
1693 int i, idx;
1694
1695 idx = sdata->fragment_next;
1696 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1697 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1698
1699 idx--;
1700 if (idx < 0)
1701 idx = IEEE80211_FRAGMENT_MAX - 1;
1702
1703 entry = &sdata->fragments[idx];
1704 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1705 entry->rx_queue != rx_queue ||
1706 entry->last_frag + 1 != frag)
1707 continue;
1708
b73d70ad 1709 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1710
b73d70ad
HH		 1711 /*
1712 * Check ftype and addresses are equal, else check next fragment
1713 */
1714 if (((hdr->frame_control ^ f_hdr->frame_control) &
1715 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1716 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1717 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1718 continue;
1719
ab46623e 1720 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1721 __skb_queue_purge(&entry->skb_list);
1722 continue;
1723 }
1724 return entry;
1725 }
1726
1727 return NULL;
1728}
1729
49461622 1730static ieee80211_rx_result debug_noinline
5cf121c3 1731ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1732{
1733 struct ieee80211_hdr *hdr;
1734 u16 sc;
358c8d9d 1735 __le16 fc;
571ecf67
JB		 1736 unsigned int frag, seq;
1737 struct ieee80211_fragment_entry *entry;
1738 struct sk_buff *skb;
554891e6 1739 struct ieee80211_rx_status *status;
571ecf67 1740
b73d70ad 1741 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1742 fc = hdr->frame_control;
f7fbf70e
JC		 1743
1744 if (ieee80211_is_ctl(fc))
1745 return RX_CONTINUE;
1746
571ecf67
JB		 1747 sc = le16_to_cpu(hdr->seq_ctrl);
1748 frag = sc & IEEE80211_SCTL_FRAG;
1749
358c8d9d 1750 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1751 is_multicast_ether_addr(hdr->addr1))) {
1752 /* not fragmented */
1753 goto out;
1754 }
1755 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1756
e3cf8b3f
ZY		 1757 if (skb_linearize(rx->skb))
1758 return RX_DROP_UNUSABLE;
1759
058897a4
AK		 1760 /*
1761 * skb_linearize() might change the skb->data and
1762 * previously cached variables (in this case, hdr) need to
1763 * be refreshed with the new data.
1764 */
1765 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1766 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1767
1768 if (frag == 0) {
1769 /* This is the first fragment of a new frame. */
1770 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1771 rx->seqno_idx, &(rx->skb));
97359d12 1772 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1773 ieee80211_has_protected(fc)) {
9e26297a 1774 int queue = rx->security_idx;
571ecf67
JB		 1775 /* Store CCMP PN so that we can verify that the next
1776 * fragment has a sequential PN value. */
1777 entry->ccmp = 1;
1778 memcpy(entry->last_pn,
9190252c 1779 rx->key->u.ccmp.rx_pn[queue],
4325f6ca 1780 IEEE80211_CCMP_PN_LEN);
571ecf67 1781 }
9ae54c84 1782 return RX_QUEUED;
571ecf67
JB		 1783 }
1784
1785 /* This is a fragment for a frame that should already be pending in
1786 * fragment cache. Add this fragment to the end of the pending entry.
1787 */
9e26297a
JB		 1788 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1789 rx->seqno_idx, hdr);
571ecf67
JB		 1790 if (!entry) {
1791 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1792 return RX_DROP_MONITOR;
571ecf67
JB		 1793 }
1794
1795 /* Verify that MPDUs within one MSDU have sequential PN values.
1796 * (IEEE 802.11i, 8.3.3.4.5) */
1797 if (entry->ccmp) {
1798 int i;
4325f6ca 1799 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
9190252c 1800 int queue;
97359d12 1801 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1802 return RX_DROP_UNUSABLE;
4325f6ca
JB		 1803 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1804 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
571ecf67
JB		 1805 pn[i]++;
1806 if (pn[i])
1807 break;
1808 }
9e26297a 1809 queue = rx->security_idx;
9190252c 1810 rpn = rx->key->u.ccmp.rx_pn[queue];
4325f6ca 1811 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
e4c26add 1812 return RX_DROP_UNUSABLE;
4325f6ca 1813 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
571ecf67
JB		 1814 }
1815
358c8d9d 1816 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1817 __skb_queue_tail(&entry->skb_list, rx->skb);
1818 entry->last_frag = frag;
1819 entry->extra_len += rx->skb->len;
358c8d9d 1820 if (ieee80211_has_morefrags(fc)) {
571ecf67 1821 rx->skb = NULL;
9ae54c84 1822 return RX_QUEUED;
571ecf67
JB		 1823 }
1824
1825 rx->skb = __skb_dequeue(&entry->skb_list);
1826 if (skb_tailroom(rx->skb) < entry->extra_len) {
1827 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1828 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1829 GFP_ATOMIC))) {
1830 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1831 __skb_queue_purge(&entry->skb_list);
e4c26add 1832 return RX_DROP_UNUSABLE;
571ecf67
JB		 1833 }
1834 }
1835 while ((skb = __skb_dequeue(&entry->skb_list))) {
1836 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1837 dev_kfree_skb(skb);
1838 }
1839
1840 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1841 status = IEEE80211_SKB_RXCB(rx->skb);
1842 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1843
1844 out:
1845 if (rx->sta)
1846 rx->sta->rx_packets++;
1847 if (is_multicast_ether_addr(hdr->addr1))
1848 rx->local->dot11MulticastReceivedFrameCount++;
1849 else
1850 ieee80211_led_rx(rx->local);
9ae54c84 1851 return RX_CONTINUE;
571ecf67
JB		 1852}
1853
1df332e8 1854static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1855{
1df332e8 1856 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1857 return -EACCES;
571ecf67 1858
76ee65bf 1859 return 0;
571ecf67
JB		 1860}
1861
1df332e8 1862static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1863{
eb9fb5b8
JB		 1864 struct sk_buff *skb = rx->skb;
1865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1866
3017b80b 1867 /*
7848ba7d
JB		 1868 * Pass through unencrypted frames if the hardware has
1869 * decrypted them already.
3017b80b 1870 */
eb9fb5b8 1871 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1872 return 0;
571ecf67
JB		 1873
1874 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1875 if (unlikely(!ieee80211_has_protected(fc) &&
1876 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1877 ieee80211_is_data(fc) &&
b3fc9c6c 1878 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1879 return -EACCES;
bef5d1c7
JB		 1880
1881 return 0;
1882}
1883
1df332e8 1884static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1885{
1886 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1888 __le16 fc = hdr->frame_control;
bef5d1c7 1889
e3efca0a
JM		 1890 /*
1891 * Pass through unencrypted frames if the hardware has
1892 * decrypted them already.
1893 */
1894 if (status->flag & RX_FLAG_DECRYPTED)
1895 return 0;
bef5d1c7 1896
c2c98fde 1897 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1898 if (unlikely(!ieee80211_has_protected(fc) &&
1899 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1900 rx->key)) {
6ff57cf8
JB		 1901 if (ieee80211_is_deauth(fc) ||
1902 ieee80211_is_disassoc(fc))
1903 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1904 rx->skb->data,
1905 rx->skb->len);
f2ca3ea4 1906 return -EACCES;
cf4e594e 1907 }
f2ca3ea4 1908 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1909 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e 1910 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
6ff57cf8
JB		 1911 if (ieee80211_is_deauth(fc) ||
1912 ieee80211_is_disassoc(fc))
1913 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1914 rx->skb->data,
1915 rx->skb->len);
f2ca3ea4 1916 return -EACCES;
cf4e594e 1917 }
f2ca3ea4
JM		 1918 /*
1919 * When using MFP, Action frames are not allowed prior to
1920 * having configured keys.
1921 */
1922 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
d8ca16db 1923 ieee80211_is_robust_mgmt_frame(rx->skb)))
f2ca3ea4
JM		 1924 return -EACCES;
1925 }
b3fc9c6c 1926
76ee65bf 1927 return 0;
571ecf67
JB		 1928}
1929
76ee65bf 1930static int
4114fa21 1931__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1932{
eb9fb5b8 1933 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1934 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1935 bool check_port_control = false;
1936 struct ethhdr *ehdr;
1937 int ret;
f14543ee 1938
4114fa21 1939 *port_control = false;
9bc383de
JB		 1940 if (ieee80211_has_a4(hdr->frame_control) &&
1941 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1942 return -1;
9bc383de 1943
fbb327c5
FF		 1944 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1945 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1946
1947 if (!sdata->u.mgd.use_4addr)
1948 return -1;
1949 else
1950 check_port_control = true;
1951 }
1952
9bc383de 1953 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1954 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1955 return -1;
571ecf67 1956
fbb327c5 1957 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1958 if (ret < 0)
fbb327c5
FF		 1959 return ret;
1960
1961 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1962 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1963 *port_control = true;
1964 else if (check_port_control)
fbb327c5
FF		 1965 return -1;
1966
1967 return 0;
76ee65bf 1968}
571ecf67 1969
ce3edf6d
JB		 1970/*
1971 * requires that rx->skb is a frame with ethernet header
1972 */
358c8d9d 1973static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1974{
c97c23e3 1975 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1976 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1977 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1978
1979 /*
1980 * Allow EAPOL frames to us/the PAE group address regardless
1981 * of whether the frame was encrypted or not.
1982 */
a621fa4d 1983 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1984 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1985 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1986 return true;
1987
1988 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1989 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1990 return false;
1991
1992 return true;
1993}
1994
1995/*
1996 * requires that rx->skb is a frame with ethernet header
1997 */
76ee65bf 1998static void
5cf121c3 1999ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 2000{
eb9fb5b8
JB		 2001 struct ieee80211_sub_if_data *sdata = rx->sdata;
2002 struct net_device *dev = sdata->dev;
76ee65bf 2003 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 2004 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2005 struct sta_info *dsta;
554891e6 2006 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 2007
76ee65bf
RR		 2008 skb = rx->skb;
2009 xmit_skb = NULL;
571ecf67 2010
05c914fe
JB		 2011 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2012 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 2013 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 2014 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 2015 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 2016 if (is_multicast_ether_addr(ehdr->h_dest)) {
2017 /*
2018 * send multicast frames both to higher layers in
2019 * local net stack and back to the wireless medium
2020 */
76ee65bf 2021 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 2022 if (!xmit_skb)
bdcbd8e0 2023 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 2024 dev->name);
571ecf67 2025 } else {
abe60632
JB		 2026 dsta = sta_info_get(sdata, skb->data);
2027 if (dsta) {
ce3edf6d
JB		 2028 /*
2029 * The destination station is associated to
2030 * this AP (in this VLAN), so send the frame
2031 * directly to it and do not pass it to local
2032 * net stack.
571ecf67 2033 */
76ee65bf 2034 xmit_skb = skb;
571ecf67
JB		 2035 skb = NULL;
2036 }
571ecf67
JB		 2037 }
2038 }
2039
59d9cb07 2040#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
9e890a1f
JB		 2041 if (skb) {
2042 /* 'align' will only take the values 0 or 2 here since all
2043 * frames are required to be aligned to 2-byte boundaries
2044 * when being passed to mac80211; the code here works just
2045 * as well if that isn't true, but mac80211 assumes it can
2046 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
d1c3a37c 2047 */
9e890a1f
JB		 2048 int align;
2049
2050 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
d1c3a37c
JB		 2051 if (align) {
2052 if (WARN_ON(skb_headroom(skb) < 3)) {
2053 dev_kfree_skb(skb);
2054 skb = NULL;
2055 } else {
2056 u8 *data = skb->data;
8ce0b589
ZY		 2057 size_t len = skb_headlen(skb);
2058 skb->data -= align;
2059 memmove(skb->data, data, len);
2060 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 2061 }
2062 }
9e890a1f 2063 }
d1c3a37c
JB		 2064#endif
2065
9e890a1f
JB		 2066 if (skb) {
2067 /* deliver to local stack */
2068 skb->protocol = eth_type_trans(skb, dev);
2069 memset(skb->cb, 0, sizeof(skb->cb));
06d181a8
JB		 2070 if (rx->local->napi)
2071 napi_gro_receive(rx->local->napi, skb);
2072 else
2073 netif_receive_skb(skb);
571ecf67
JB		 2074 }
2075
76ee65bf 2076 if (xmit_skb) {
aef6c928
HS		 2077 /*
2078 * Send to wireless media and increase priority by 256 to
2079 * keep the received priority instead of reclassifying
2080 * the frame (see cfg80211_classify8021d).
2081 */
2082 xmit_skb->priority += 256;
f831e909 2083 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 2084 skb_reset_network_header(xmit_skb);
2085 skb_reset_mac_header(xmit_skb);
76ee65bf 2086 dev_queue_xmit(xmit_skb);
571ecf67 2087 }
76ee65bf
RR		 2088}
2089
49461622 2090static ieee80211_rx_result debug_noinline
5cf121c3 2091ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 2092{
eb9fb5b8 2093 struct net_device *dev = rx->sdata->dev;
eaf85ca7 2094 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 2095 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2096 __le16 fc = hdr->frame_control;
eaf85ca7 2097 struct sk_buff_head frame_list;
554891e6 2098 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 2099
358c8d9d 2100 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 2101 return RX_CONTINUE;
fd4c7f2f 2102
358c8d9d 2103 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 2104 return RX_DROP_MONITOR;
fd4c7f2f 2105
554891e6 2106 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 2107 return RX_CONTINUE;
fd4c7f2f 2108
eaf85ca7
ZY		 2109 if (ieee80211_has_a4(hdr->frame_control) &&
2110 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2111 !rx->sdata->u.vlan.sta)
e4c26add 2112 return RX_DROP_UNUSABLE;
fd4c7f2f 2113
eaf85ca7
ZY		 2114 if (is_multicast_ether_addr(hdr->addr1) &&
2115 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2116 rx->sdata->u.vlan.sta) ||
2117 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2118 rx->sdata->u.mgd.use_4addr)))
e4c26add 2119 return RX_DROP_UNUSABLE;
fd4c7f2f 2120
eaf85ca7
ZY		 2121 skb->dev = dev;
2122 __skb_queue_head_init(&frame_list);
fd4c7f2f 2123
e3cf8b3f
ZY		 2124 if (skb_linearize(skb))
2125 return RX_DROP_UNUSABLE;
2126
eaf85ca7
ZY		 2127 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2128 rx->sdata->vif.type,
8b3becad 2129 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 2130
eaf85ca7
ZY		 2131 while (!skb_queue_empty(&frame_list)) {
2132 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 2133
358c8d9d 2134 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 2135 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 2136 continue;
2137 }
eaf85ca7
ZY		 2138 dev->stats.rx_packets++;
2139 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 2140
2141 ieee80211_deliver_skb(rx);
2142 }
2143
9ae54c84 2144 return RX_QUEUED;
fd4c7f2f
RR		 2145}
2146
bf94e17b 2147#ifdef CONFIG_MAC80211_MESH
b0dee578 2148static ieee80211_rx_result
e32f85f7
LCC		 2149ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2150{
30789eb6
TP		 2151 struct ieee80211_hdr *fwd_hdr, *hdr;
2152 struct ieee80211_tx_info *info;
e32f85f7 2153 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2154 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2155 struct ieee80211_local *local = rx->local;
eb9fb5b8 2156 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2157 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2158 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
30789eb6 2159 u16 q, hdrlen;
e32f85f7
LCC		 2160
2161 hdr = (struct ieee80211_hdr *) skb->data;
2162 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2163
2164 /* make sure fixed part of mesh header is there, also checks skb len */
2165 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2166 return RX_DROP_MONITOR;
2167
2168 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2169
2170 /* make sure full mesh header is there, also checks skb len */
2171 if (!pskb_may_pull(rx->skb,
2172 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2173 return RX_DROP_MONITOR;
2174
2175 /* reload pointers */
2176 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2177 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2178
2157fdd6
TP		 2179 /* frame is in RMC, don't forward */
2180 if (ieee80211_is_data(hdr->frame_control) &&
2181 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2182 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2183 return RX_DROP_MONITOR;
2184
555cb715
JC		 2185 if (!ieee80211_is_data(hdr->frame_control) ||
2186 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2187 return RX_CONTINUE;
2188
2189 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2190 return RX_DROP_MONITOR;
2191
43b7b314 2192 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2193 struct mesh_path *mppath;
43b7b314
JC		 2194 char *proxied_addr;
2195 char *mpp_addr;
2196
2197 if (is_multicast_ether_addr(hdr->addr1)) {
2198 mpp_addr = hdr->addr3;
2199 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2200 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2201 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2202 mpp_addr = hdr->addr4;
2203 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2204 } else {
2205 return RX_DROP_MONITOR;
43b7b314 2206 }
79617dee 2207
79617dee 2208 rcu_read_lock();
bf7cd94d 2209 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2210 if (!mppath) {
bf7cd94d 2211 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2212 } else {
2213 spin_lock_bh(&mppath->state_lock);
b203ca39 2214 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2215 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2216 spin_unlock_bh(&mppath->state_lock);
2217 }
2218 rcu_read_unlock();
2219 }
2220
3c5772a5
JC		 2221 /* Frame has reached destination. Don't forward */
2222 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2223 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2224 return RX_CONTINUE;
2225
00e96dec 2226 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2227 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2228 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2229 return RX_DROP_MONITOR;
2230 }
2231 skb_set_queue_mapping(skb, q);
e32f85f7 2232
30789eb6
TP		 2233 if (!--mesh_hdr->ttl) {
2234 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2235 goto out;
30789eb6
TP		 2236 }
2237
d665508b
CYY		 2238 if (!ifmsh->mshcfg.dot11MeshForwarding)
2239 goto out;
2240
30789eb6
TP		 2241 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2242 if (!fwd_skb) {
bdcbd8e0 2243 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2244 sdata->name);
30789eb6
TP		 2245 goto out;
2246 }
2247
2248 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2249 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2250 info = IEEE80211_SKB_CB(fwd_skb);
2251 memset(info, 0, sizeof(*info));
2252 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2253 info->control.vif = &rx->sdata->vif;
2254 info->control.jiffies = jiffies;
2255 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2256 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2257 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2258 /* update power mode indication when forwarding */
2259 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2260 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2261 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2262 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2263 } else {
2264 /* unable to resolve next hop */
bf7cd94d 2265 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
f63f8421
CYY		 2266 fwd_hdr->addr3, 0,
2267 WLAN_REASON_MESH_PATH_NOFORWARD,
2268 fwd_hdr->addr2);
30789eb6 2269 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2270 kfree_skb(fwd_skb);
30789eb6 2271 return RX_DROP_MONITOR;
e32f85f7
LCC		 2272 }
2273
30789eb6
TP		 2274 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2275 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2276 out:
3c5772a5 2277 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2278 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2279 return RX_CONTINUE;
2280 else
2281 return RX_DROP_MONITOR;
2282}
bf94e17b 2283#endif
e32f85f7 2284
49461622 2285static ieee80211_rx_result debug_noinline
5cf121c3 2286ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2287{
eb9fb5b8 2288 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2289 struct ieee80211_local *local = rx->local;
eb9fb5b8 2290 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2291 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2292 __le16 fc = hdr->frame_control;
4114fa21 2293 bool port_control;
ce3edf6d 2294 int err;
76ee65bf 2295
358c8d9d 2296 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2297 return RX_CONTINUE;
76ee65bf 2298
358c8d9d 2299 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2300 return RX_DROP_MONITOR;
76ee65bf 2301
f14543ee 2302 /*
e7f4a940
JB		 2303 * Send unexpected-4addr-frame event to hostapd. For older versions,
2304 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2305 */
2306 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2307 sdata->vif.type == NL80211_IFTYPE_AP) {
2308 if (rx->sta &&
2309 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2310 cfg80211_rx_unexpected_4addr_frame(
2311 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2312 return RX_DROP_MONITOR;
e7f4a940 2313 }
f14543ee 2314
4114fa21 2315 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2316 if (unlikely(err))
e4c26add 2317 return RX_DROP_UNUSABLE;
76ee65bf 2318
358c8d9d 2319 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2320 return RX_DROP_MONITOR;
ce3edf6d 2321
4114fa21
FF		 2322 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2323 unlikely(port_control) && sdata->bss) {
2324 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2325 u.ap);
2326 dev = sdata->dev;
2327 rx->sdata = sdata;
2328 }
2329
76ee65bf
RR		 2330 rx->skb->dev = dev;
2331
2332 dev->stats.rx_packets++;
2333 dev->stats.rx_bytes += rx->skb->len;
2334
08ca944e 2335 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2336 !is_multicast_ether_addr(
2337 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2338 (!local->scanning &&
2339 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2340 mod_timer(&local->dynamic_ps_timer, jiffies +
2341 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2342 }
2343
76ee65bf 2344 ieee80211_deliver_skb(rx);
571ecf67 2345
9ae54c84 2346 return RX_QUEUED;
571ecf67
JB		 2347}
2348
49461622 2349static ieee80211_rx_result debug_noinline
f9e124fb 2350ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2351{
71364716 2352 struct sk_buff *skb = rx->skb;
a7767f95 2353 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2354 struct tid_ampdu_rx *tid_agg_rx;
2355 u16 start_seq_num;
2356 u16 tid;
2357
a7767f95 2358 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2359 return RX_CONTINUE;
71364716 2360
a7767f95 2361 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2362 struct {
2363 __le16 control, start_seq_num;
2364 } __packed bar_data;
2365
71364716 2366 if (!rx->sta)
a02ae758 2367 return RX_DROP_MONITOR;
8ae5977f
JB		 2368
2369 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2370 &bar_data, sizeof(bar_data)))
2371 return RX_DROP_MONITOR;
2372
8ae5977f 2373 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2374
2375 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2376 if (!tid_agg_rx)
a02ae758 2377 return RX_DROP_MONITOR;
71364716 2378
8ae5977f 2379 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2380
2381 /* reset session timer */
20ad19d0
JB		 2382 if (tid_agg_rx->timeout)
2383 mod_timer(&tid_agg_rx->session_timer,
2384 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2385
dd318575 2386 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2387 /* release stored frames up to start of BAR */
d3b2fb53 2388 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2389 start_seq_num, frames);
dd318575
JB		 2390 spin_unlock(&tid_agg_rx->reorder_lock);
2391
a02ae758
JB		 2392 kfree_skb(skb);
2393 return RX_QUEUED;
71364716
RR		 2394 }
2395
08daecae
JB		 2396 /*
2397 * After this point, we only want management frames,
2398 * so we can drop all remaining control frames to
2399 * cooked monitor interfaces.
2400 */
2401 return RX_DROP_MONITOR;
71364716
RR		 2402}
2403
f4f727a6
JM		 2404static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2405 struct ieee80211_mgmt *mgmt,
2406 size_t len)
fea14732
JM		 2407{
2408 struct ieee80211_local *local = sdata->local;
2409 struct sk_buff *skb;
2410 struct ieee80211_mgmt *resp;
2411
b203ca39 2412 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2413 /* Not to own unicast address */
2414 return;
2415 }
2416
b203ca39
JP		 2417 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2418 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2419 /* Not from the current AP or not associated yet. */
fea14732
JM		 2420 return;
2421 }
2422
2423 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2424 /* Too short SA Query request frame */
2425 return;
2426 }
2427
2428 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2429 if (skb == NULL)
2430 return;
2431
2432 skb_reserve(skb, local->hw.extra_tx_headroom);
2433 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2434 memset(resp, 0, 24);
2435 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2436 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2437 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2438 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2439 IEEE80211_STYPE_ACTION);
2440 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2441 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2442 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2443 memcpy(resp->u.action.u.sa_query.trans_id,
2444 mgmt->u.action.u.sa_query.trans_id,
2445 WLAN_SA_QUERY_TR_ID_LEN);
2446
62ae67be 2447 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2448}
2449
2e161f78
JB		 2450static ieee80211_rx_result debug_noinline
2451ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2452{
2453 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2454 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2455
2456 /*
2457 * From here on, look only at management frames.
2458 * Data and control frames are already handled,
2459 * and unknown (reserved) frames are useless.
2460 */
2461 if (rx->skb->len < 24)
2462 return RX_DROP_MONITOR;
2463
2464 if (!ieee80211_is_mgmt(mgmt->frame_control))
2465 return RX_DROP_MONITOR;
2466
ee971924
JB		 2467 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2468 ieee80211_is_beacon(mgmt->frame_control) &&
2469 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2470 int sig = 0;
2471
2472 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2473 sig = status->signal;
2474
ee971924
JB		 2475 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2476 rx->skb->data, rx->skb->len,
37c73b5f 2477 status->freq, sig);
ee971924
JB		 2478 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2479 }
2480
554891e6 2481 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2482 return RX_DROP_MONITOR;
2483
2484 if (ieee80211_drop_unencrypted_mgmt(rx))
2485 return RX_DROP_UNUSABLE;
2486
2487 return RX_CONTINUE;
2488}
2489
de1ede7a
JB		 2490static ieee80211_rx_result debug_noinline
2491ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2492{
2493 struct ieee80211_local *local = rx->local;
eb9fb5b8 2494 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2495 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2496 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2497 int len = rx->skb->len;
2498
2499 if (!ieee80211_is_action(mgmt->frame_control))
2500 return RX_CONTINUE;
2501
026331c4
JM		 2502 /* drop too small frames */
2503 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2504 return RX_DROP_UNUSABLE;
de1ede7a 2505
815b8092 2506 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
cd7760e6
SW		 2507 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2508 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
84040805 2509 return RX_DROP_UNUSABLE;
de1ede7a 2510
554891e6 2511 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2512 return RX_DROP_UNUSABLE;
97ebe12a 2513
de1ede7a 2514 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2515 case WLAN_CATEGORY_HT:
2516 /* reject HT action frames from stations not supporting HT */
2517 if (!rx->sta->sta.ht_cap.ht_supported)
2518 goto invalid;
2519
2520 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2521 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2522 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2523 sdata->vif.type != NL80211_IFTYPE_AP &&
2524 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2525 break;
2526
ec61cd63 2527 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2528 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2529 goto invalid;
2530
2531 switch (mgmt->u.action.u.ht_smps.action) {
2532 case WLAN_HT_ACTION_SMPS: {
2533 struct ieee80211_supported_band *sband;
af0ed69b 2534 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2535
2536 /* convert to HT capability */
2537 switch (mgmt->u.action.u.ht_smps.smps_control) {
2538 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2539 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2540 break;
2541 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2542 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2543 break;
2544 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2545 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2546 break;
2547 default:
2548 goto invalid;
2549 }
1d8d3dec
JB		 2550
2551 /* if no change do nothing */
af0ed69b 2552 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2553 goto handled;
af0ed69b 2554 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2555
2556 sband = rx->local->hw.wiphy->bands[status->band];
2557
64f68e5d
JB		 2558 rate_control_rate_update(local, sband, rx->sta,
2559 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2560 goto handled;
2561 }
ec61cd63
JB		 2562 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2563 struct ieee80211_supported_band *sband;
2564 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2565 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2566
2567 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2568 if (!(rx->sta->sta.ht_cap.cap &
2569 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2570 goto handled;
2571
e1a0c6b3
JB		 2572 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2573 new_bw = IEEE80211_STA_RX_BW_20;
2574 else
2575 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2576
e1a0c6b3 2577 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2578 goto handled;
2579
ec61cd63
JB		 2580 sband = rx->local->hw.wiphy->bands[status->band];
2581
2582 rate_control_rate_update(local, sband, rx->sta,
2583 IEEE80211_RC_BW_CHANGED);
2584 goto handled;
2585 }
1d8d3dec
JB		 2586 default:
2587 goto invalid;
2588 }
2589
0af83d3d 2590 break;
1b3a2e49
JB		 2591 case WLAN_CATEGORY_PUBLIC:
2592 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2593 goto invalid;
2594 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2595 break;
2596 if (!rx->sta)
2597 break;
2598 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2599 break;
2600 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2601 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2602 break;
2603 if (len < offsetof(struct ieee80211_mgmt,
2604 u.action.u.ext_chan_switch.variable))
2605 goto invalid;
2606 goto queue;
0af83d3d
JB		 2607 case WLAN_CATEGORY_VHT:
2608 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2609 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2610 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2611 sdata->vif.type != NL80211_IFTYPE_AP &&
2612 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2613 break;
2614
2615 /* verify action code is present */
2616 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2617 goto invalid;
2618
2619 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2620 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2621 u8 opmode;
2622
2623 /* verify opmode is present */
2624 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2625 goto invalid;
2626
2627 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2628
2629 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2630 opmode, status->band,
2631 false);
0af83d3d
JB		 2632 goto handled;
2633 }
2634 default:
2635 break;
2636 }
1d8d3dec 2637 break;
de1ede7a 2638 case WLAN_CATEGORY_BACK:
8abd3f9b 2639 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2640 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2641 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2642 sdata->vif.type != NL80211_IFTYPE_AP &&
2643 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2644 break;
8abd3f9b 2645
026331c4
JM		 2646 /* verify action_code is present */
2647 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2648 break;
2649
de1ede7a
JB		 2650 switch (mgmt->u.action.u.addba_req.action_code) {
2651 case WLAN_ACTION_ADDBA_REQ:
2652 if (len < (IEEE80211_MIN_ACTION_SIZE +
2653 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2654 goto invalid;
2655 break;
de1ede7a
JB		 2656 case WLAN_ACTION_ADDBA_RESP:
2657 if (len < (IEEE80211_MIN_ACTION_SIZE +
2658 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2659 goto invalid;
2660 break;
de1ede7a
JB		 2661 case WLAN_ACTION_DELBA:
2662 if (len < (IEEE80211_MIN_ACTION_SIZE +
2663 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2664 goto invalid;
2665 break;
2666 default:
2667 goto invalid;
de1ede7a 2668 }
bed7ee6e 2669
8b58ff83 2670 goto queue;
39192c0b 2671 case WLAN_CATEGORY_SPECTRUM_MGMT:
026331c4
JM		 2672 /* verify action_code is present */
2673 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2674 break;
2675
39192c0b
JB		 2676 switch (mgmt->u.action.u.measurement.action_code) {
2677 case WLAN_ACTION_SPCT_MSR_REQ:
cd7760e6
SW		 2678 if (status->band != IEEE80211_BAND_5GHZ)
2679 break;
2680
39192c0b
JB		 2681 if (len < (IEEE80211_MIN_ACTION_SIZE +
2682 sizeof(mgmt->u.action.u.measurement)))
84040805 2683 break;
cd7760e6
SW		 2684
2685 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2686 break;
2687
39192c0b 2688 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2689 goto handled;
cd7760e6
SW		 2690 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2691 u8 *bssid;
2692 if (len < (IEEE80211_MIN_ACTION_SIZE +
2693 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2694 break;
cc32abd4 2695
cd7760e6 2696 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
b8456a14
CYY		 2697 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2698 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
cd7760e6
SW		 2699 break;
2700
2701 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2702 bssid = sdata->u.mgd.bssid;
2703 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2704 bssid = sdata->u.ibss.bssid;
b8456a14
CYY		 2705 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2706 bssid = mgmt->sa;
cd7760e6
SW		 2707 else
2708 break;
2709
2710 if (!ether_addr_equal(mgmt->bssid, bssid))
84040805 2711 break;
c481ec97 2712
8b58ff83 2713 goto queue;
cd7760e6 2714 }
39192c0b
JB		 2715 }
2716 break;
fea14732
JM		 2717 case WLAN_CATEGORY_SA_QUERY:
2718 if (len < (IEEE80211_MIN_ACTION_SIZE +
2719 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2720 break;
2721
fea14732
JM		 2722 switch (mgmt->u.action.u.sa_query.action) {
2723 case WLAN_ACTION_SA_QUERY_REQUEST:
2724 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2725 break;
fea14732 2726 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2727 goto handled;
fea14732
JM		 2728 }
2729 break;
8db09850 2730 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2731 if (len < (IEEE80211_MIN_ACTION_SIZE +
2732 sizeof(mgmt->u.action.u.self_prot.action_code)))
2733 break;
2734
8db09850
TP		 2735 switch (mgmt->u.action.u.self_prot.action_code) {
2736 case WLAN_SP_MESH_PEERING_OPEN:
2737 case WLAN_SP_MESH_PEERING_CLOSE:
2738 case WLAN_SP_MESH_PEERING_CONFIRM:
2739 if (!ieee80211_vif_is_mesh(&sdata->vif))
2740 goto invalid;
a6dad6a2 2741 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2742 /* userspace handles this frame */
2743 break;
2744 goto queue;
2745 case WLAN_SP_MGK_INFORM:
2746 case WLAN_SP_MGK_ACK:
2747 if (!ieee80211_vif_is_mesh(&sdata->vif))
2748 goto invalid;
2749 break;
2750 }
2751 break;
d3aaec8a 2752 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2753 if (len < (IEEE80211_MIN_ACTION_SIZE +
2754 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2755 break;
2756
77a121c3
JB		 2757 if (!ieee80211_vif_is_mesh(&sdata->vif))
2758 break;
25d49e4d 2759 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2760 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2761 break;
2762 goto queue;
84040805 2763 }
026331c4 2764
2e161f78
JB		 2765 return RX_CONTINUE;
2766
bed7ee6e 2767 invalid:
554891e6 2768 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2769 /* will return in the next handlers */
2770 return RX_CONTINUE;
2771
2772 handled:
2773 if (rx->sta)
2774 rx->sta->rx_packets++;
2775 dev_kfree_skb(rx->skb);
2776 return RX_QUEUED;
2777
2778 queue:
2779 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2780 skb_queue_tail(&sdata->skb_queue, rx->skb);
2781 ieee80211_queue_work(&local->hw, &sdata->work);
2782 if (rx->sta)
2783 rx->sta->rx_packets++;
2784 return RX_QUEUED;
2785}
2786
2787static ieee80211_rx_result debug_noinline
2788ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2789{
554891e6 2790 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2791 int sig = 0;
2e161f78
JB		 2792
2793 /* skip known-bad action frames and return them in the next handler */
554891e6 2794 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2795 return RX_CONTINUE;
d7907448 2796
026331c4
JM		 2797 /*
2798 * Getting here means the kernel doesn't know how to handle
2799 * it, but maybe userspace does ... include returned frames
2800 * so userspace can register for those to know whether ones
2801 * it transmitted were processed or returned.
2802 */
026331c4 2803
804483e9
JB		 2804 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2805 sig = status->signal;
2806
71bbc994 2807 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
970fdfa8 2808 rx->skb->data, rx->skb->len, 0)) {
2e161f78
JB		 2809 if (rx->sta)
2810 rx->sta->rx_packets++;
2811 dev_kfree_skb(rx->skb);
2812 return RX_QUEUED;
2813 }
2814
2e161f78
JB		 2815 return RX_CONTINUE;
2816}
2817
2818static ieee80211_rx_result debug_noinline
2819ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2820{
2821 struct ieee80211_local *local = rx->local;
2822 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2823 struct sk_buff *nskb;
2824 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2825 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2826
2827 if (!ieee80211_is_action(mgmt->frame_control))
2828 return RX_CONTINUE;
2829
2830 /*
2831 * For AP mode, hostapd is responsible for handling any action
2832 * frames that we didn't handle, including returning unknown
2833 * ones. For all other modes we will return them to the sender,
2834 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2835 * 802.11-2012 9.24.4.
2e161f78
JB		 2836 * Newer versions of hostapd shall also use the management frame
2837 * registration mechanisms, but older ones still use cooked
2838 * monitor interfaces so push all frames there.
2839 */
554891e6 2840 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2841 (sdata->vif.type == NL80211_IFTYPE_AP ||
2842 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2843 return RX_DROP_MONITOR;
026331c4 2844
4b5ebccc
JB		 2845 if (is_multicast_ether_addr(mgmt->da))
2846 return RX_DROP_MONITOR;
2847
84040805
JB		 2848 /* do not return rejected action frames */
2849 if (mgmt->u.action.category & 0x80)
2850 return RX_DROP_UNUSABLE;
2851
2852 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2853 GFP_ATOMIC);
2854 if (nskb) {
292b4df6 2855 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2856
292b4df6
JL		 2857 nmgmt->u.action.category |= 0x80;
2858 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2859 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2860
2861 memset(nskb->cb, 0, sizeof(nskb->cb));
2862
07e5a5f5
JB		 2863 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2864 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2865
2866 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2867 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2868 IEEE80211_TX_CTL_NO_CCK_RATE;
2869 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2870 info->hw_queue =
2871 local->hw.offchannel_tx_hw_queue;
2872 }
2873
2874 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2875 status->band);
de1ede7a 2876 }
39192c0b
JB		 2877 dev_kfree_skb(rx->skb);
2878 return RX_QUEUED;
de1ede7a
JB		 2879}
2880
49461622 2881static ieee80211_rx_result debug_noinline
5cf121c3 2882ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2883{
eb9fb5b8 2884 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2885 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2886 __le16 stype;
571ecf67 2887
77a121c3 2888 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2889
77a121c3
JB		 2890 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2891 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
239281f8 2892 sdata->vif.type != NL80211_IFTYPE_OCB &&
77a121c3
JB		 2893 sdata->vif.type != NL80211_IFTYPE_STATION)
2894 return RX_DROP_MONITOR;
472dbc45 2895
77a121c3 2896 switch (stype) {
66e67e41 2897 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2898 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2899 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2900 /* process for all: mesh, mlme, ibss */
2901 break;
66e67e41
JB		 2902 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2903 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2904 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2905 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2906 if (is_multicast_ether_addr(mgmt->da) &&
2907 !is_broadcast_ether_addr(mgmt->da))
2908 return RX_DROP_MONITOR;
2909
77a121c3
JB		 2910 /* process only for station */
2911 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2912 return RX_DROP_MONITOR;
2913 break;
2914 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2915 /* process only for ibss and mesh */
2916 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2917 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2918 return RX_DROP_MONITOR;
2919 break;
2920 default:
2921 return RX_DROP_MONITOR;
2922 }
f9d540ee 2923
77a121c3 2924 /* queue up frame and kick off work to process it */
c1475ca9 2925 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2926 skb_queue_tail(&sdata->skb_queue, rx->skb);
2927 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2928 if (rx->sta)
2929 rx->sta->rx_packets++;
46900298 2930
77a121c3 2931 return RX_QUEUED;
571ecf67
JB		 2932}
2933
5cf121c3 2934/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2935static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2936 struct ieee80211_rate *rate)
3d30d949
MW		 2937{
2938 struct ieee80211_sub_if_data *sdata;
2939 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2940 struct sk_buff *skb = rx->skb, *skb2;
2941 struct net_device *prev_dev = NULL;
eb9fb5b8 2942 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2943 int needed_headroom;
3d30d949 2944
554891e6
JB		 2945 /*
2946 * If cooked monitor has been processed already, then
2947 * don't do it again. If not, set the flag.
2948 */
2949 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2950 goto out_free_skb;
554891e6 2951 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2952
152c477a
JB		 2953 /* If there are no cooked monitor interfaces, just free the SKB */
2954 if (!local->cooked_mntrs)
2955 goto out_free_skb;
2956
1f7bba79
JB		 2957 /* vendor data is long removed here */
2958 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
293702a3 2959 /* room for the radiotap header based on driver features */
1f7bba79 2960 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
3d30d949 2961
293702a3
JB		 2962 if (skb_headroom(skb) < needed_headroom &&
2963 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2964 goto out_free_skb;
3d30d949 2965
293702a3 2966 /* prepend radiotap information */
973ef21a
FF		 2967 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2968 false);
3d30d949
MW		 2969
2970 skb_set_mac_header(skb, 0);
2971 skb->ip_summed = CHECKSUM_UNNECESSARY;
2972 skb->pkt_type = PACKET_OTHERHOST;
2973 skb->protocol = htons(ETH_P_802_2);
2974
2975 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2976 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2977 continue;
2978
05c914fe 2979 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2980 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2981 continue;
2982
2983 if (prev_dev) {
2984 skb2 = skb_clone(skb, GFP_ATOMIC);
2985 if (skb2) {
2986 skb2->dev = prev_dev;
5548a8a1 2987 netif_receive_skb(skb2);
3d30d949
MW		 2988 }
2989 }
2990
2991 prev_dev = sdata->dev;
2992 sdata->dev->stats.rx_packets++;
2993 sdata->dev->stats.rx_bytes += skb->len;
2994 }
2995
2996 if (prev_dev) {
2997 skb->dev = prev_dev;
5548a8a1 2998 netif_receive_skb(skb);
554891e6
JB		 2999 return;
3000 }
3d30d949
MW		 3001
3002 out_free_skb:
3003 dev_kfree_skb(skb);
3004}
3005
aa0c8636
CL		 3006static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3007 ieee80211_rx_result res)
3008{
3009 switch (res) {
3010 case RX_DROP_MONITOR:
3011 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3012 if (rx->sta)
3013 rx->sta->rx_dropped++;
3014 /* fall through */
3015 case RX_CONTINUE: {
3016 struct ieee80211_rate *rate = NULL;
3017 struct ieee80211_supported_band *sband;
3018 struct ieee80211_rx_status *status;
3019
3020 status = IEEE80211_SKB_RXCB((rx->skb));
3021
3022 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 3023 if (!(status->flag & RX_FLAG_HT) &&
3024 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 3025 rate = &sband->bitrates[status->rate_idx];
3026
3027 ieee80211_rx_cooked_monitor(rx, rate);
3028 break;
3029 }
3030 case RX_DROP_UNUSABLE:
3031 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3032 if (rx->sta)
3033 rx->sta->rx_dropped++;
3034 dev_kfree_skb(rx->skb);
3035 break;
3036 case RX_QUEUED:
3037 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3038 break;
3039 }
3040}
571ecf67 3041
f9e124fb
CL		 3042static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3043 struct sk_buff_head *frames)
58905290 3044{
58905290 3045 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 3046 struct sk_buff *skb;
8944b79f 3047
e32f85f7
LCC		 3048#define CALL_RXH(rxh) \
3049 do { \
3050 res = rxh(rx); \
3051 if (res != RX_CONTINUE) \
2569a826 3052 goto rxh_next; \
e32f85f7 3053 } while (0);
49461622 3054
f9e124fb 3055 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 3056
f9e124fb 3057 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 3058 /*
3059 * all the other fields are valid across frames
3060 * that belong to an aMPDU since they are on the
3061 * same TID from the same station
3062 */
3063 rx->skb = skb;
3064
2569a826 3065 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 3066 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826 3067 CALL_RXH(ieee80211_rx_h_sta_process)
86c228a7 3068 CALL_RXH(ieee80211_rx_h_decrypt)
2569a826 3069 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 3070 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3071 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 3072#ifdef CONFIG_MAC80211_MESH
aa0c8636 3073 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 3074 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 3075#endif
2154c81c 3076 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 3077 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 3078
3079 /* special treatment -- needs the queue */
3080 res = ieee80211_rx_h_ctrl(rx, frames);
3081 if (res != RX_CONTINUE)
3082 goto rxh_next;
3083
2e161f78 3084 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 3085 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 3086 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3087 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 3088 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 3089
aa0c8636
CL		 3090 rxh_next:
3091 ieee80211_rx_handlers_result(rx, res);
f9e124fb 3092
49461622 3093#undef CALL_RXH
aa0c8636 3094 }
24a8fdad 3095
f9e124fb 3096 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 3097}
3098
4406c376 3099static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 3100{
f9e124fb 3101 struct sk_buff_head reorder_release;
aa0c8636
CL		 3102 ieee80211_rx_result res = RX_DROP_MONITOR;
3103
f9e124fb
CL		 3104 __skb_queue_head_init(&reorder_release);
3105
aa0c8636
CL		 3106#define CALL_RXH(rxh) \
3107 do { \
3108 res = rxh(rx); \
3109 if (res != RX_CONTINUE) \
3110 goto rxh_next; \
3111 } while (0);
3112
aa0c8636
CL		 3113 CALL_RXH(ieee80211_rx_h_check)
3114
f9e124fb 3115 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 3116
f9e124fb 3117 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 3118 return;
49461622 3119
2569a826 3120 rxh_next:
aa0c8636
CL		 3121 ieee80211_rx_handlers_result(rx, res);
3122
3123#undef CALL_RXH
58905290
JB		 3124}
3125
2bff8ebf 3126/*
dd318575
JB		 3127 * This function makes calls into the RX path, therefore
3128 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 3129 */
3130void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3131{
f9e124fb 3132 struct sk_buff_head frames;
554891e6
JB		 3133 struct ieee80211_rx_data rx = {
3134 .sta = sta,
3135 .sdata = sta->sdata,
3136 .local = sta->local,
9e26297a
JB		 3137 /* This is OK -- must be QoS data frame */
3138 .security_idx = tid,
3139 .seqno_idx = tid,
fcf8bd3b 3140 .flags = 0,
554891e6 3141 };
2c15a0cf
CL		 3142 struct tid_ampdu_rx *tid_agg_rx;
3143
3144 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3145 if (!tid_agg_rx)
3146 return;
2bff8ebf 3147
f9e124fb
CL		 3148 __skb_queue_head_init(&frames);
3149
2c15a0cf 3150 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 3151 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 3152 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 3153
f9e124fb 3154 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 3155}
3156
571ecf67
JB		 3157/* main receive path */
3158
3c2723f5
JB		 3159static bool prepare_for_handlers(struct ieee80211_rx_data *rx,
3160 struct ieee80211_hdr *hdr)
23a24def 3161{
20b01f80 3162 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 3163 struct sk_buff *skb = rx->skb;
3164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3165 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 3166 int multicast = is_multicast_ether_addr(hdr->addr1);
3167
51fb61e7 3168 switch (sdata->vif.type) {
05c914fe 3169 case NL80211_IFTYPE_STATION:
9bc383de 3170 if (!bssid && !sdata->u.mgd.use_4addr)
3c2723f5 3171 return false;
77fdaa12 3172 if (!multicast &&
b203ca39 3173 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3174 if (!(sdata->dev->flags & IFF_PROMISC) ||
3175 sdata->u.mgd.use_4addr)
3c2723f5 3176 return false;
554891e6 3177 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3178 }
3179 break;
05c914fe 3180 case NL80211_IFTYPE_ADHOC:
23a24def 3181 if (!bssid)
3c2723f5 3182 return false;
6329b8d9
FF		 3183 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3184 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3c2723f5 3185 return false;
a7767f95 3186 if (ieee80211_is_beacon(hdr->frame_control)) {
3c2723f5 3187 return true;
d48b2968 3188 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3c2723f5 3189 return false;
23a24def 3190 } else if (!multicast &&
b203ca39 3191 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3192 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3193 return false;
554891e6 3194 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3195 } else if (!rx->sta) {
3196 int rate_idx;
5614618e
JB		 3197 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3198 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3199 else
eb9fb5b8 3200 rate_idx = status->rate_idx;
8bf11d8d
JB		 3201 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3202 BIT(rate_idx));
0fb8ca45 3203 }
23a24def 3204 break;
239281f8
RL		 3205 case NL80211_IFTYPE_OCB:
3206 if (!bssid)
3207 return false;
3208 if (ieee80211_is_beacon(hdr->frame_control)) {
3209 return false;
3210 } else if (!is_broadcast_ether_addr(bssid)) {
3211 ocb_dbg(sdata, "BSSID mismatch in OCB mode!\n");
3212 return false;
3213 } else if (!multicast &&
3214 !ether_addr_equal(sdata->dev->dev_addr,
3215 hdr->addr1)) {
3216 /* if we are in promisc mode we also accept
3217 * packets not destined for us
3218 */
3219 if (!(sdata->dev->flags & IFF_PROMISC))
3220 return false;
3221 rx->flags &= ~IEEE80211_RX_RA_MATCH;
3222 } else if (!rx->sta) {
3223 int rate_idx;
3224 if (status->flag & RX_FLAG_HT)
3225 rate_idx = 0; /* TODO: HT rates */
3226 else
3227 rate_idx = status->rate_idx;
3228 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3229 BIT(rate_idx));
3230 }
3231 break;
05c914fe 3232 case NL80211_IFTYPE_MESH_POINT:
6032f934 3233 if (!multicast &&
b203ca39 3234 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934 3235 if (!(sdata->dev->flags & IFF_PROMISC))
3c2723f5 3236 return false;
6032f934 3237
554891e6 3238 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3239 }
3240 break;
05c914fe
JB		 3241 case NL80211_IFTYPE_AP_VLAN:
3242 case NL80211_IFTYPE_AP:
23a24def 3243 if (!bssid) {
b203ca39 3244 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3245 return false;
f142c6b9 3246 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3247 /*
3248 * Accept public action frames even when the
3249 * BSSID doesn't match, this is used for P2P
3250 * and location updates. Note that mac80211
3251 * itself never looks at these frames.
3252 */
2b9ccd4e
JB		 3253 if (!multicast &&
3254 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3c2723f5 3255 return false;
d48b2968 3256 if (ieee80211_is_public_action(hdr, skb->len))
3c2723f5 3257 return true;
d48b2968 3258 if (!ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3259 return false;
554891e6 3260 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
db8e1732
AN		 3261 } else if (!ieee80211_has_tods(hdr->frame_control)) {
3262 /* ignore data frames to TDLS-peers */
3263 if (ieee80211_is_data(hdr->frame_control))
3264 return false;
3265 /* ignore action frames to TDLS-peers */
3266 if (ieee80211_is_action(hdr->frame_control) &&
3267 !ether_addr_equal(bssid, hdr->addr1))
3268 return false;
23a24def 3269 }
23a24def 3270 break;
05c914fe 3271 case NL80211_IFTYPE_WDS:
a7767f95 3272 if (bssid || !ieee80211_is_data(hdr->frame_control))
3c2723f5 3273 return false;
b203ca39 3274 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
3c2723f5 3275 return false;
23a24def 3276 break;
f142c6b9
JB		 3277 case NL80211_IFTYPE_P2P_DEVICE:
3278 if (!ieee80211_is_public_action(hdr, skb->len) &&
3279 !ieee80211_is_probe_req(hdr->frame_control) &&
3280 !ieee80211_is_probe_resp(hdr->frame_control) &&
3281 !ieee80211_is_beacon(hdr->frame_control))
3c2723f5 3282 return false;
1b737f88
JB		 3283 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3284 !multicast)
f142c6b9
JB		 3285 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3286 break;
2ca27bcf 3287 default:
fb1c1cd6 3288 /* should never get here */
f142c6b9 3289 WARN_ON_ONCE(1);
fb1c1cd6 3290 break;
23a24def
JB		 3291 }
3292
3c2723f5 3293 return true;
23a24def
JB		 3294}
3295
4406c376
JB		 3296/*
3297 * This function returns whether or not the SKB
3298 * was destined for RX processing or not, which,
3299 * if consume is true, is equivalent to whether
3300 * or not the skb was consumed.
3301 */
3302static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3303 struct sk_buff *skb, bool consume)
3304{
3305 struct ieee80211_local *local = rx->local;
3306 struct ieee80211_sub_if_data *sdata = rx->sdata;
3307 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3308 struct ieee80211_hdr *hdr = (void *)skb->data;
4406c376
JB		 3309
3310 rx->skb = skb;
554891e6 3311 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376 3312
40791942 3313 if (!prepare_for_handlers(rx, hdr))
4406c376
JB		 3314 return false;
3315
4406c376
JB		 3316 if (!consume) {
3317 skb = skb_copy(skb, GFP_ATOMIC);
3318 if (!skb) {
3319 if (net_ratelimit())
3320 wiphy_debug(local->hw.wiphy,
b305dae4 3321 "failed to copy skb for %s\n",
4406c376
JB		 3322 sdata->name);
3323 return true;
3324 }
3325
3326 rx->skb = skb;
3327 }
3328
3329 ieee80211_invoke_rx_handlers(rx);
3330 return true;
3331}
3332
571ecf67 3333/*
6b59db7d 3334 * This is the actual Rx frames handler. as it belongs to Rx path it must
6368e4b1 3335 * be called with rcu_read_lock protection.
571ecf67 3336 */
71ebb4aa 3337static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3338 struct sk_buff *skb)
571ecf67
JB		 3339{
3340 struct ieee80211_local *local = hw_to_local(hw);
3341 struct ieee80211_sub_if_data *sdata;
571ecf67 3342 struct ieee80211_hdr *hdr;
e3cf8b3f 3343 __le16 fc;
5cf121c3 3344 struct ieee80211_rx_data rx;
4406c376 3345 struct ieee80211_sub_if_data *prev;
56af3268 3346 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3347 int err = 0;
571ecf67 3348
e3cf8b3f 3349 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3350 memset(&rx, 0, sizeof(rx));
3351 rx.skb = skb;
3352 rx.local = local;
72abd81b 3353
e3cf8b3f 3354 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3355 local->dot11ReceivedFragmentCount++;
571ecf67 3356
4a4f1a58
JB		 3357 if (ieee80211_is_mgmt(fc)) {
3358 /* drop frame if too short for header */
3359 if (skb->len < ieee80211_hdrlen(fc))
3360 err = -ENOBUFS;
3361 else
3362 err = skb_linearize(skb);
3363 } else {
e3cf8b3f 3364 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3365 }
e3cf8b3f
ZY		 3366
3367 if (err) {
3368 dev_kfree_skb(skb);
3369 return;
3370 }
3371
3372 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3373 ieee80211_parse_qos(&rx);
d1c3a37c 3374 ieee80211_verify_alignment(&rx);
38f3714d 3375
d48b2968
JB		 3376 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3377 ieee80211_is_beacon(hdr->frame_control)))
3378 ieee80211_scan_rx(local, skb);
3379
e3cf8b3f 3380 if (ieee80211_is_data(fc)) {
56af3268 3381 prev_sta = NULL;
4406c376 3382
7852e361 3383 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3384 if (!prev_sta) {
3385 prev_sta = sta;
3386 continue;
3387 }
3388
3389 rx.sta = prev_sta;
3390 rx.sdata = prev_sta->sdata;
4406c376 3391 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3392
56af3268 3393 prev_sta = sta;
4406c376 3394 }
56af3268
BG		 3395
3396 if (prev_sta) {
3397 rx.sta = prev_sta;
3398 rx.sdata = prev_sta->sdata;
3399
4406c376 3400 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3401 return;
8e26d5ad 3402 goto out;
56af3268 3403 }
4406c376
JB		 3404 }
3405
4b0dd98e 3406 prev = NULL;
b2e7771e 3407
4b0dd98e
JB		 3408 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3409 if (!ieee80211_sdata_running(sdata))
3410 continue;
340e11f3 3411
4b0dd98e
JB		 3412 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3413 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3414 continue;
340e11f3 3415
4b0dd98e
JB		 3416 /*
3417 * frame is destined for this interface, but if it's
3418 * not also for the previous one we handle that after
3419 * the loop to avoid copying the SKB once too much
3420 */
4bb29f8c 3421
4b0dd98e 3422 if (!prev) {
abe60632 3423 prev = sdata;
4b0dd98e 3424 continue;
340e11f3 3425 }
4bb29f8c 3426
7852e361 3427 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3428 rx.sdata = prev;
3429 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3430
4b0dd98e
JB		 3431 prev = sdata;
3432 }
3433
3434 if (prev) {
7852e361 3435 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3436 rx.sdata = prev;
4406c376 3437
4b0dd98e
JB		 3438 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3439 return;
571ecf67 3440 }
4406c376 3441
8e26d5ad 3442 out:
4406c376 3443 dev_kfree_skb(skb);
571ecf67 3444}
6368e4b1
RR		 3445
3446/*
3447 * This is the receive path handler. It is called by a low level driver when an
3448 * 802.11 MPDU is received from the hardware.
3449 */
103bf9f7 3450void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3451{
3452 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3453 struct ieee80211_rate *rate = NULL;
3454 struct ieee80211_supported_band *sband;
f1d58c25 3455 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3456
d20ef63d
JB		 3457 WARN_ON_ONCE(softirq_count() == 0);
3458
444e3803 3459 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3460 goto drop;
8318d78a
JB		 3461
3462 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3463 if (WARN_ON(!sband))
3464 goto drop;
8318d78a 3465
89c3a8ac
JB		 3466 /*
3467 * If we're suspending, it is possible although not too likely
3468 * that we'd be receiving frames after having already partially
3469 * quiesced the stack. We can't process such frames then since
3470 * that might, for example, cause stations to be added or other
3471 * driver callbacks be invoked.
3472 */
77a980dc
JB		 3473 if (unlikely(local->quiescing || local->suspended))
3474 goto drop;
89c3a8ac 3475
04800ada
AN		 3476 /* We might be during a HW reconfig, prevent Rx for the same reason */
3477 if (unlikely(local->in_reconfig))
3478 goto drop;
3479
ea77f12f
JB		 3480 /*
3481 * The same happens when we're not even started,
3482 * but that's worth a warning.
3483 */
77a980dc
JB		 3484 if (WARN_ON(!local->started))
3485 goto drop;
ea77f12f 3486
fc885189 3487 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3488 /*
fc885189
JB		 3489 * Validate the rate, unless a PLCP error means that
3490 * we probably can't have a valid rate here anyway.
e5d6eb83 3491 */
fc885189
JB		 3492
3493 if (status->flag & RX_FLAG_HT) {
3494 /*
3495 * rate_idx is MCS index, which can be [0-76]
3496 * as documented on:
3497 *
3498 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3499 *
3500 * Anything else would be some sort of driver or
3501 * hardware error. The driver should catch hardware
3502 * errors.
3503 */
444e3803 3504 if (WARN(status->rate_idx > 76,
fc885189
JB		 3505 "Rate marked as an HT rate but passed "
3506 "status->rate_idx is not "
3507 "an MCS index [0-76]: %d (0x%02x)\n",
3508 status->rate_idx,
3509 status->rate_idx))
3510 goto drop;
5614618e
JB		 3511 } else if (status->flag & RX_FLAG_VHT) {
3512 if (WARN_ONCE(status->rate_idx > 9 ||
3513 !status->vht_nss ||
3514 status->vht_nss > 8,
3515 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3516 status->rate_idx, status->vht_nss))
3517 goto drop;
fc885189 3518 } else {
444e3803 3519 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3520 goto drop;
3521 rate = &sband->bitrates[status->rate_idx];
3522 }
0fb8ca45 3523 }
6368e4b1 3524
554891e6
JB		 3525 status->rx_flags = 0;
3526
6368e4b1
RR		 3527 /*
3528 * key references and virtual interfaces are protected using RCU
3529 * and this requires that we are in a read-side RCU section during
3530 * receive processing
3531 */
3532 rcu_read_lock();
3533
3534 /*
3535 * Frames with failed FCS/PLCP checksum are not returned,
3536 * all other frames are returned without radiotap header
3537 * if it was previously present.
3538 * Also, frames with less than 16 bytes are dropped.
3539 */
f1d58c25 3540 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3541 if (!skb) {
3542 rcu_read_unlock();
3543 return;
3544 }
3545
e1e54068
JB		 3546 ieee80211_tpt_led_trig_rx(local,
3547 ((struct ieee80211_hdr *)skb->data)->frame_control,
3548 skb->len);
071d9ac2 3549 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3550
3551 rcu_read_unlock();
77a980dc
JB		 3552
3553 return;
3554 drop:
3555 kfree_skb(skb);
6368e4b1 3556}
103bf9f7 3557EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3558
3559/* This is a version of the rx handler that can be called from hard irq
3560 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3561void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3562{
3563 struct ieee80211_local *local = hw_to_local(hw);
3564
3565 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3566
571ecf67
JB		 3567 skb->pkt_type = IEEE80211_RX_MSG;
3568 skb_queue_tail(&local->skb_queue, skb);
3569 tasklet_schedule(&local->tasklet);
3570}
3571EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)