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Revert: "rt2x00: Don't let mac80211 send a BAR when an AMPDU subframe fails"
[mirror_ubuntu-artful-kernel.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>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
90b9e446
JB		 43 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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
90b9e446
JB		 56 if (status->vendor_radiotap_len)
57 __pskb_pull(skb, status->vendor_radiotap_len);
58
b2e7771e
JB		 59 return skb;
60}
61
1df332e8 62static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
b2e7771e 63{
f1d58c25 64 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
605f1a5b
JB		 65 struct ieee80211_hdr *hdr;
66
67 hdr = (void *)(skb->data + status->vendor_radiotap_len);
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))
b2e7771e 72 return 1;
605f1a5b
JB		 73 if (unlikely(skb->len < 16 + present_fcs_len +
74 status->vendor_radiotap_len))
b2e7771e 75 return 1;
87228f57
HH		 76 if (ieee80211_is_ctl(hdr->frame_control) &&
77 !ieee80211_is_pspoll(hdr->frame_control) &&
78 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 79 return 1;
80 return 0;
81}
82
601ae7f2 83static int
90b9e446
JB		 84ieee80211_rx_radiotap_space(struct ieee80211_local *local,
85 struct ieee80211_rx_status *status)
601ae7f2
BR		 86{
87 int len;
88
89 /* always present fields */
90 len = sizeof(struct ieee80211_radiotap_header) + 9;
91
90b9e446
JB		 92 /* allocate extra bitmap */
93 if (status->vendor_radiotap_len)
94 len += 4;
95
96 if (ieee80211_have_rx_timestamp(status)) {
97 len = ALIGN(len, 8);
601ae7f2 98 len += 8;
90b9e446 99 }
7fee5372 100 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 101 len += 1;
601ae7f2 102
90b9e446
JB		 103 /* padding for RX_FLAGS if necessary */
104 len = ALIGN(len, 2);
601ae7f2 105
6d744bac
JB		 106 if (status->flag & RX_FLAG_HT) /* HT info */
107 len += 3;
108
4c298677 109 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
90b9e446 110 len = ALIGN(len, 4);
4c298677
JB		 111 len += 8;
112 }
113
51648921
JB		 114 if (status->flag & RX_FLAG_VHT) {
115 len = ALIGN(len, 2);
116 len += 12;
117 }
118
90b9e446
JB		 119 if (status->vendor_radiotap_len) {
120 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
121 status->vendor_radiotap_align = 1;
122 /* align standard part of vendor namespace */
123 len = ALIGN(len, 2);
124 /* allocate standard part of vendor namespace */
125 len += 6;
126 /* align vendor-defined part */
127 len = ALIGN(len, status->vendor_radiotap_align);
128 /* vendor-defined part is already in skb */
129 }
130
601ae7f2
BR		 131 return len;
132}
133
00ea6deb 134/*
601ae7f2
BR		 135 * ieee80211_add_rx_radiotap_header - add radiotap header
136 *
137 * add a radiotap header containing all the fields which the hardware provided.
138 */
139static void
140ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
141 struct sk_buff *skb,
601ae7f2 142 struct ieee80211_rate *rate,
973ef21a 143 int rtap_len, bool has_fcs)
601ae7f2 144{
f1d58c25 145 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 146 struct ieee80211_radiotap_header *rthdr;
147 unsigned char *pos;
6a86b9c7 148 u16 rx_flags = 0;
f4bda337
TP		 149 int mpdulen;
150
151 mpdulen = skb->len;
152 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
153 mpdulen += FCS_LEN;
601ae7f2
BR		 154
155 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
156 memset(rthdr, 0, rtap_len);
157
158 /* radiotap header, set always present flags */
159 rthdr->it_present =
160 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 161 (1 << IEEE80211_RADIOTAP_CHANNEL) |
162 (1 << IEEE80211_RADIOTAP_ANTENNA) |
163 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
90b9e446 164 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
601ae7f2 165
1df332e8 166 pos = (unsigned char *)(rthdr + 1);
601ae7f2 167
90b9e446
JB		 168 if (status->vendor_radiotap_len) {
169 rthdr->it_present |=
170 cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
171 cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
172 put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
173 pos += 4;
174 }
175
601ae7f2
BR		 176 /* the order of the following fields is important */
177
178 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 179 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 180 /* padding */
181 while ((pos - (u8 *)rthdr) & 7)
182 *pos++ = 0;
f4bda337
TP		 183 put_unaligned_le64(
184 ieee80211_calculate_rx_timestamp(local, status,
185 mpdulen, 0),
186 pos);
1df332e8 187 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 188 pos += 8;
189 }
190
191 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 192 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 193 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 194 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
195 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 196 if (status->flag & RX_FLAG_SHORTPRE)
197 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 198 pos++;
199
200 /* IEEE80211_RADIOTAP_RATE */
5614618e 201 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 202 /*
f8d1ccf1 203 * Without rate information don't add it. If we have,
38f37be2 204 * MCS information is a separate field in radiotap,
73b48099
JB		 205 * added below. The byte here is needed as padding
206 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 207 */
208 *pos = 0;
8d6f658e 209 } else {
ebe6c7ba 210 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 211 *pos = rate->bitrate / 5;
8d6f658e 212 }
601ae7f2
BR		 213 pos++;
214
215 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 216 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 217 pos += 2;
218 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 219 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
220 pos);
5614618e 221 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
5f0b7de5
JB		 222 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
223 pos);
f8d1ccf1 224 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 225 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
226 pos);
f8d1ccf1 227 else if (rate)
6a86b9c7
JB		 228 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
229 pos);
f8d1ccf1
JB		 230 else
231 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 232 pos += 2;
233
234 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 235 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
236 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 237 *pos = status->signal;
238 rthdr->it_present |=
239 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
240 pos++;
241 }
242
601ae7f2
BR		 243 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
244
245 /* IEEE80211_RADIOTAP_ANTENNA */
246 *pos = status->antenna;
247 pos++;
248
601ae7f2
BR		 249 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
250
251 /* IEEE80211_RADIOTAP_RX_FLAGS */
252 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 253 if ((pos - (u8 *)rthdr) & 1)
90b9e446 254 *pos++ = 0;
aae89831 255 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 256 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
257 put_unaligned_le16(rx_flags, pos);
601ae7f2 258 pos += 2;
6d744bac
JB		 259
260 if (status->flag & RX_FLAG_HT) {
261 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 262 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 263 *pos = 0;
264 if (status->flag & RX_FLAG_SHORT_GI)
265 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
266 if (status->flag & RX_FLAG_40MHZ)
267 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 268 if (status->flag & RX_FLAG_HT_GF)
269 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
6d744bac
JB		 270 pos++;
271 *pos++ = status->rate_idx;
272 }
4c298677
JB		 273
274 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
275 u16 flags = 0;
276
277 /* ensure 4 byte alignment */
278 while ((pos - (u8 *)rthdr) & 3)
279 pos++;
280 rthdr->it_present |=
281 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
282 put_unaligned_le32(status->ampdu_reference, pos);
283 pos += 4;
284 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
285 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
286 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
287 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
288 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
289 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
290 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
291 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
292 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
293 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
294 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
295 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
296 put_unaligned_le16(flags, pos);
297 pos += 2;
298 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
299 *pos++ = status->ampdu_delimiter_crc;
300 else
301 *pos++ = 0;
302 *pos++ = 0;
303 }
90b9e446 304
51648921
JB		 305 if (status->flag & RX_FLAG_VHT) {
306 u16 known = local->hw.radiotap_vht_details;
307
308 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
309 /* known field - how to handle 80+80? */
310 if (status->flag & RX_FLAG_80P80MHZ)
311 known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
312 put_unaligned_le16(known, pos);
313 pos += 2;
314 /* flags */
315 if (status->flag & RX_FLAG_SHORT_GI)
316 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
317 pos++;
318 /* bandwidth */
319 if (status->flag & RX_FLAG_80MHZ)
320 *pos++ = 4;
321 else if (status->flag & RX_FLAG_80P80MHZ)
322 *pos++ = 0; /* marked not known above */
323 else if (status->flag & RX_FLAG_160MHZ)
324 *pos++ = 11;
325 else if (status->flag & RX_FLAG_40MHZ)
326 *pos++ = 1;
327 else /* 20 MHz */
328 *pos++ = 0;
329 /* MCS/NSS */
330 *pos = (status->rate_idx << 4) | status->vht_nss;
331 pos += 4;
332 /* coding field */
333 pos++;
334 /* group ID */
335 pos++;
336 /* partial_aid */
337 pos += 2;
338 }
339
90b9e446
JB		 340 if (status->vendor_radiotap_len) {
341 /* ensure 2 byte alignment for the vendor field as required */
342 if ((pos - (u8 *)rthdr) & 1)
343 *pos++ = 0;
344 *pos++ = status->vendor_radiotap_oui[0];
345 *pos++ = status->vendor_radiotap_oui[1];
346 *pos++ = status->vendor_radiotap_oui[2];
347 *pos++ = status->vendor_radiotap_subns;
348 put_unaligned_le16(status->vendor_radiotap_len, pos);
349 pos += 2;
350 /* align the actual payload as requested */
351 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
352 *pos++ = 0;
353 }
601ae7f2
BR		 354}
355
b2e7771e
JB		 356/*
357 * This function copies a received frame to all monitor interfaces and
358 * returns a cleaned-up SKB that no longer includes the FCS nor the
359 * radiotap header the driver might have added.
360 */
361static struct sk_buff *
362ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 363 struct ieee80211_rate *rate)
b2e7771e 364{
f1d58c25 365 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 366 struct ieee80211_sub_if_data *sdata;
293702a3 367 int needed_headroom;
b2e7771e
JB		 368 struct sk_buff *skb, *skb2;
369 struct net_device *prev_dev = NULL;
370 int present_fcs_len = 0;
b2e7771e
JB		 371
372 /*
373 * First, we may need to make a copy of the skb because
374 * (1) we need to modify it for radiotap (if not present), and
375 * (2) the other RX handlers will modify the skb we got.
376 *
377 * We don't need to, of course, if we aren't going to return
378 * the SKB because it has a bad FCS/PLCP checksum.
379 */
0869aea0
JB		 380
381 /* room for the radiotap header based on driver features */
90b9e446 382 needed_headroom = ieee80211_rx_radiotap_space(local, status);
b2e7771e
JB		 383
384 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
385 present_fcs_len = FCS_LEN;
386
605f1a5b
JB		 387 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
388 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
e3cf8b3f
ZY		 389 dev_kfree_skb(origskb);
390 return NULL;
391 }
392
b2e7771e 393 if (!local->monitors) {
0869aea0 394 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 395 dev_kfree_skb(origskb);
396 return NULL;
397 }
398
0869aea0 399 return remove_monitor_info(local, origskb);
b2e7771e
JB		 400 }
401
0869aea0 402 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 403 /* only need to expand headroom if necessary */
404 skb = origskb;
405 origskb = NULL;
406
407 /*
408 * This shouldn't trigger often because most devices have an
409 * RX header they pull before we get here, and that should
410 * be big enough for our radiotap information. We should
411 * probably export the length to drivers so that we can have
412 * them allocate enough headroom to start with.
413 */
414 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 415 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 416 dev_kfree_skb(skb);
417 return NULL;
418 }
419 } else {
420 /*
421 * Need to make a copy and possibly remove radiotap header
422 * and FCS from the original.
423 */
424 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
425
0869aea0 426 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 427
428 if (!skb)
429 return origskb;
430 }
431
0869aea0 432 /* prepend radiotap information */
973ef21a
FF		 433 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
434 true);
b2e7771e 435
ce3edf6d 436 skb_reset_mac_header(skb);
b2e7771e
JB		 437 skb->ip_summed = CHECKSUM_UNNECESSARY;
438 skb->pkt_type = PACKET_OTHERHOST;
439 skb->protocol = htons(ETH_P_802_2);
440
441 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 442 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 443 continue;
444
3d30d949
MW		 445 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
446 continue;
447
9607e6b6 448 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 449 continue;
450
b2e7771e
JB		 451 if (prev_dev) {
452 skb2 = skb_clone(skb, GFP_ATOMIC);
453 if (skb2) {
454 skb2->dev = prev_dev;
5548a8a1 455 netif_receive_skb(skb2);
b2e7771e
JB		 456 }
457 }
458
459 prev_dev = sdata->dev;
460 sdata->dev->stats.rx_packets++;
461 sdata->dev->stats.rx_bytes += skb->len;
462 }
463
464 if (prev_dev) {
465 skb->dev = prev_dev;
5548a8a1 466 netif_receive_skb(skb);
b2e7771e
JB		 467 } else
468 dev_kfree_skb(skb);
469
470 return origskb;
471}
472
5cf121c3 473static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 474{
238f74a2 475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 476 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 477 int tid, seqno_idx, security_idx;
6e0d114d
JB		 478
479 /* does the frame have a qos control field? */
238f74a2
HH		 480 if (ieee80211_is_data_qos(hdr->frame_control)) {
481 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 482 /* frame has qos control */
238f74a2 483 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 484 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 485 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 486
487 seqno_idx = tid;
488 security_idx = tid;
6e0d114d 489 } else {
1411f9b5
JB		 490 /*
491 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
492 *
493 * Sequence numbers for management frames, QoS data
494 * frames with a broadcast/multicast address in the
495 * Address 1 field, and all non-QoS data frames sent
496 * by QoS STAs are assigned using an additional single
497 * modulo-4096 counter, [...]
498 *
499 * We also use that counter for non-QoS STAs.
500 */
5a306f58 501 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 502 security_idx = 0;
503 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 504 security_idx = IEEE80211_NUM_TIDS;
9e26297a 505 tid = 0;
6e0d114d 506 }
52865dfd 507
9e26297a
JB		 508 rx->seqno_idx = seqno_idx;
509 rx->security_idx = security_idx;
6e0d114d
JB		 510 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
511 * For now, set skb->priority to 0 for other cases. */
512 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 513}
6e0d114d 514
d1c3a37c
JB		 515/**
516 * DOC: Packet alignment
517 *
518 * Drivers always need to pass packets that are aligned to two-byte boundaries
519 * to the stack.
520 *
521 * Additionally, should, if possible, align the payload data in a way that
522 * guarantees that the contained IP header is aligned to a four-byte
523 * boundary. In the case of regular frames, this simply means aligning the
524 * payload to a four-byte boundary (because either the IP header is directly
525 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 526 * in front of it). If the payload data is not properly aligned and the
527 * architecture doesn't support efficient unaligned operations, mac80211
528 * will align the data.
d1c3a37c
JB		 529 *
530 * With A-MSDU frames, however, the payload data address must yield two modulo
531 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
532 * push the IP header further back to a multiple of four again. Thankfully, the
533 * specs were sane enough this time around to require padding each A-MSDU
534 * subframe to a length that is a multiple of four.
535 *
25985edc 536 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 537 * the payload is not supported, the driver is required to move the 802.11
538 * header to be directly in front of the payload in that case.
539 */
540static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 541{
59d9cb07
KV		 542#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
543 WARN_ONCE((unsigned long)rx->skb->data & 1,
544 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 545#endif
6e0d114d
JB		 546}
547
6368e4b1 548
571ecf67
JB		 549/* rx handlers */
550
3cfcf6ac
JM		 551static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
552{
553 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
554
555 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
556 return 0;
557
558 return ieee80211_is_robust_mgmt_frame(hdr);
559}
560
561
562static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
563{
564 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
565
566 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
567 return 0;
568
569 return ieee80211_is_robust_mgmt_frame(hdr);
570}
571
572
573/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
574static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
575{
576 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
577 struct ieee80211_mmie *mmie;
578
1df332e8 579 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 580 return -1;
581
582 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
583 return -1; /* not a robust management frame */
584
585 mmie = (struct ieee80211_mmie *)
586 (skb->data + skb->len - sizeof(*mmie));
587 if (mmie->element_id != WLAN_EID_MMIE ||
588 mmie->length != sizeof(*mmie) - 2)
589 return -1;
590
591 return le16_to_cpu(mmie->key_id);
592}
593
1df332e8 594static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 595{
a7767f95 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 597 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 598
a7767f95 599 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 600 if (is_multicast_ether_addr(hdr->addr1)) {
601 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 602 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 603 return RX_DROP_MONITOR;
b203ca39 604 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 605 return RX_DROP_MONITOR;
606 } else {
607 if (!ieee80211_has_a4(hdr->frame_control))
608 return RX_DROP_MONITOR;
b203ca39 609 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 610 return RX_DROP_MONITOR;
611 }
33b64eb2
LCC		 612 }
613
614 /* If there is not an established peer link and this is not a peer link
615 * establisment frame, beacon or probe, drop the frame.
616 */
617
57cf8043 618 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 619 struct ieee80211_mgmt *mgmt;
d6d1a5a7 620
a7767f95 621 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 622 return RX_DROP_MONITOR;
623
a7767f95 624 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 625 u8 category;
9b395bc3
JB		 626
627 /* make sure category field is present */
628 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
629 return RX_DROP_MONITOR;
630
33b64eb2 631 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 632 category = mgmt->u.action.category;
633 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 634 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 635 return RX_DROP_MONITOR;
33b64eb2 636 return RX_CONTINUE;
33b64eb2
LCC		 637 }
638
a7767f95
HH		 639 if (ieee80211_is_probe_req(hdr->frame_control) ||
640 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 641 ieee80211_is_beacon(hdr->frame_control) ||
642 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 643 return RX_CONTINUE;
644
645 return RX_DROP_MONITOR;
a7767f95
HH		 646 }
647
902acc78
JB		 648 return RX_CONTINUE;
649}
33b64eb2 650
1edfb1af
JB		 651#define SEQ_MODULO 0x1000
652#define SEQ_MASK 0xfff
653
654static inline int seq_less(u16 sq1, u16 sq2)
655{
656 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
657}
658
659static inline u16 seq_inc(u16 sq)
660{
661 return (sq + 1) & SEQ_MASK;
662}
663
664static inline u16 seq_sub(u16 sq1, u16 sq2)
665{
666 return (sq1 - sq2) & SEQ_MASK;
667}
668
d3b2fb53 669static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 670 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 671 int index)
1edfb1af 672{
d3b2fb53 673 struct ieee80211_local *local = sdata->local;
1edfb1af 674 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 675 struct ieee80211_rx_status *status;
1edfb1af 676
dd318575
JB		 677 lockdep_assert_held(&tid_agg_rx->reorder_lock);
678
1edfb1af
JB		 679 if (!skb)
680 goto no_frame;
681
071d9ac2 682 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 683 tid_agg_rx->stored_mpdu_num--;
684 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 685 status = IEEE80211_SKB_RXCB(skb);
686 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 687 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 688
689no_frame:
690 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
691}
692
d3b2fb53 693static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 694 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 695 u16 head_seq_num)
1edfb1af
JB		 696{
697 int index;
698
dd318575
JB		 699 lockdep_assert_held(&tid_agg_rx->reorder_lock);
700
1edfb1af
JB		 701 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
702 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
703 tid_agg_rx->buf_size;
d3b2fb53 704 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
1edfb1af
JB		 705 }
706}
707
708/*
709 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
710 * the skb was added to the buffer longer than this time ago, the earlier
711 * frames that have not yet been received are assumed to be lost and the skb
712 * can be released for processing. This may also release other skb's from the
713 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 714 *
715 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 716 */
717#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
718
d3b2fb53 719static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
24a8fdad 720 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 721{
2bff8ebf 722 int index, j;
aa0c8636 723
dd318575
JB		 724 lockdep_assert_held(&tid_agg_rx->reorder_lock);
725
aa0c8636
CL		 726 /* release the buffer until next missing frame */
727 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
728 tid_agg_rx->buf_size;
729 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 730 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 731 /*
732 * No buffers ready to be released, but check whether any
733 * frames in the reorder buffer have timed out.
734 */
aa0c8636
CL		 735 int skipped = 1;
736 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
737 j = (j + 1) % tid_agg_rx->buf_size) {
738 if (!tid_agg_rx->reorder_buf[j]) {
739 skipped++;
740 continue;
741 }
499fe9a4
DH		 742 if (skipped &&
743 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 744 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 745 goto set_release_timer;
aa0c8636 746
bdcbd8e0
JB		 747 ht_dbg_ratelimited(sdata,
748 "release an RX reorder frame due to timeout on earlier frames\n");
d3b2fb53 749 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
aa0c8636
CL		 750
751 /*
752 * Increment the head seq# also for the skipped slots.
753 */
754 tid_agg_rx->head_seq_num =
755 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
756 skipped = 0;
757 }
758 } else while (tid_agg_rx->reorder_buf[index]) {
d3b2fb53 759 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
aa0c8636
CL		 760 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
761 tid_agg_rx->buf_size;
762 }
2bff8ebf
CL		 763
764 if (tid_agg_rx->stored_mpdu_num) {
765 j = index = seq_sub(tid_agg_rx->head_seq_num,
766 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
767
768 for (; j != (index - 1) % tid_agg_rx->buf_size;
769 j = (j + 1) % tid_agg_rx->buf_size) {
770 if (tid_agg_rx->reorder_buf[j])
771 break;
772 }
773
774 set_release_timer:
775
776 mod_timer(&tid_agg_rx->reorder_timer,
334df731 777 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 778 HT_RX_REORDER_BUF_TIMEOUT);
779 } else {
780 del_timer(&tid_agg_rx->reorder_timer);
781 }
aa0c8636
CL		 782}
783
1edfb1af
JB		 784/*
785 * As this function belongs to the RX path it must be under
786 * rcu_read_lock protection. It returns false if the frame
787 * can be processed immediately, true if it was consumed.
788 */
d3b2fb53 789static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 790 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 791 struct sk_buff *skb)
1edfb1af
JB		 792{
793 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
794 u16 sc = le16_to_cpu(hdr->seq_ctrl);
795 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
796 u16 head_seq_num, buf_size;
797 int index;
2bff8ebf 798 bool ret = true;
1edfb1af 799
dd318575
JB		 800 spin_lock(&tid_agg_rx->reorder_lock);
801
1edfb1af
JB		 802 buf_size = tid_agg_rx->buf_size;
803 head_seq_num = tid_agg_rx->head_seq_num;
804
805 /* frame with out of date sequence number */
806 if (seq_less(mpdu_seq_num, head_seq_num)) {
807 dev_kfree_skb(skb);
2bff8ebf 808 goto out;
1edfb1af
JB		 809 }
810
811 /*
812 * If frame the sequence number exceeds our buffering window
813 * size release some previous frames to make room for this one.
814 */
815 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
816 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
817 /* release stored frames up to new head to stack */
d3b2fb53
JB		 818 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
819 head_seq_num);
1edfb1af
JB		 820 }
821
822 /* Now the new frame is always in the range of the reordering buffer */
823
824 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
825
826 /* check if we already stored this frame */
827 if (tid_agg_rx->reorder_buf[index]) {
828 dev_kfree_skb(skb);
2bff8ebf 829 goto out;
1edfb1af
JB		 830 }
831
832 /*
833 * If the current MPDU is in the right order and nothing else
834 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 835 * If it is first but there's something stored, we may be able
836 * to release frames after this one.
1edfb1af
JB		 837 */
838 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
839 tid_agg_rx->stored_mpdu_num == 0) {
840 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 841 ret = false;
842 goto out;
1edfb1af
JB		 843 }
844
845 /* put the frame in the reordering buffer */
846 tid_agg_rx->reorder_buf[index] = skb;
847 tid_agg_rx->reorder_time[index] = jiffies;
848 tid_agg_rx->stored_mpdu_num++;
d3b2fb53 849 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
1edfb1af 850
2bff8ebf
CL		 851 out:
852 spin_unlock(&tid_agg_rx->reorder_lock);
853 return ret;
1edfb1af
JB		 854}
855
856/*
857 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
858 * true if the MPDU was buffered, false if it should be processed.
859 */
24a8fdad 860static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 861{
2569a826
JB		 862 struct sk_buff *skb = rx->skb;
863 struct ieee80211_local *local = rx->local;
1edfb1af 864 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 866 struct sta_info *sta = rx->sta;
1edfb1af
JB		 867 struct tid_ampdu_rx *tid_agg_rx;
868 u16 sc;
6cc00d54 869 u8 tid, ack_policy;
1edfb1af
JB		 870
871 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 872 goto dont_reorder;
1edfb1af
JB		 873
874 /*
875 * filter the QoS data rx stream according to
876 * STA/TID and check if this STA/TID is on aggregation
877 */
878
1edfb1af 879 if (!sta)
2569a826 880 goto dont_reorder;
1edfb1af 881
6cc00d54
TP		 882 ack_policy = *ieee80211_get_qos_ctl(hdr) &
883 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 884 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
885
a87f736d
JB		 886 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
887 if (!tid_agg_rx)
888 goto dont_reorder;
1edfb1af
JB		 889
890 /* qos null data frames are excluded */
891 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 892 goto dont_reorder;
1edfb1af 893
6cc00d54
TP		 894 /* not part of a BA session */
895 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
896 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
897 goto dont_reorder;
898
660c6a44
TP		 899 /* not actually part of this BA session */
900 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
901 goto dont_reorder;
902
1edfb1af
JB		 903 /* new, potentially un-ordered, ampdu frame - process it */
904
905 /* reset session timer */
906 if (tid_agg_rx->timeout)
12d3952f 907 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 908
909 /* if this mpdu is fragmented - terminate rx aggregation session */
910 sc = le16_to_cpu(hdr->seq_ctrl);
911 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 912 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 913 skb_queue_tail(&rx->sdata->skb_queue, skb);
914 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 915 return;
1edfb1af
JB		 916 }
917
a87f736d
JB		 918 /*
919 * No locking needed -- we will only ever process one
920 * RX packet at a time, and thus own tid_agg_rx. All
921 * other code manipulating it needs to (and does) make
922 * sure that we cannot get to it any more before doing
923 * anything with it.
924 */
d3b2fb53 925 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
2569a826
JB		 926 return;
927
928 dont_reorder:
24a8fdad 929 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 930}
33b64eb2 931
49461622 932static ieee80211_rx_result debug_noinline
5cf121c3 933ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 934{
a7767f95 935 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 936 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 937
938 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
939 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 940 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 941 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 942 hdr->seq_ctrl)) {
554891e6 943 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 944 rx->local->dot11FrameDuplicateCount++;
945 rx->sta->num_duplicates++;
946 }
b1f93314 947 return RX_DROP_UNUSABLE;
571ecf67 948 } else
9e26297a 949 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 950 }
951
571ecf67
JB		 952 if (unlikely(rx->skb->len < 16)) {
953 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 954 return RX_DROP_MONITOR;
571ecf67
JB		 955 }
956
571ecf67
JB		 957 /* Drop disallowed frame classes based on STA auth/assoc state;
958 * IEEE 802.11, Chap 5.5.
959 *
ccd7b362
JB		 960 * mac80211 filters only based on association state, i.e. it drops
961 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 962 * deauth/disassoc frames when needed. In addition, hostapd is
963 * responsible for filtering on both auth and assoc states.
964 */
33b64eb2 965
902acc78 966 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 967 return ieee80211_rx_mesh_check(rx);
33b64eb2 968
a7767f95
HH		 969 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
970 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 971 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 972 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 973 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 974 /*
975 * accept port control frames from the AP even when it's not
976 * yet marked ASSOC to prevent a race where we don't set the
977 * assoc bit quickly enough before it sends the first frame
978 */
979 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 980 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 981 unsigned int hdrlen;
982 __be16 ethertype;
983
984 hdrlen = ieee80211_hdrlen(hdr->frame_control);
985
986 if (rx->skb->len < hdrlen + 8)
987 return RX_DROP_MONITOR;
988
989 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
990 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 991 return RX_CONTINUE;
992 }
21fc7560
JB		 993
994 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
995 cfg80211_rx_spurious_frame(rx->sdata->dev,
996 hdr->addr2,
997 GFP_ATOMIC))
998 return RX_DROP_UNUSABLE;
999
e4c26add 1000 return RX_DROP_MONITOR;
2a33bee2 1001 }
571ecf67 1002
9ae54c84 1003 return RX_CONTINUE;
570bd537
JB		 1004}
1005
1006
49461622 1007static ieee80211_rx_result debug_noinline
5cf121c3 1008ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 1009{
eb9fb5b8
JB		 1010 struct sk_buff *skb = rx->skb;
1011 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1012 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 1013 int keyidx;
1014 int hdrlen;
e4c26add 1015 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 1016 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 1017 int mmie_keyidx = -1;
761ab470 1018 __le16 fc;
570bd537 1019
3017b80b
JB		 1020 /*
1021 * Key selection 101
1022 *
3cfcf6ac 1023 * There are four types of keys:
3017b80b 1024 * - GTK (group keys)
3cfcf6ac 1025 * - IGTK (group keys for management frames)
3017b80b
JB		 1026 * - PTK (pairwise keys)
1027 * - STK (station-to-station pairwise keys)
1028 *
1029 * When selecting a key, we have to distinguish between multicast
1030 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 1031 * use PTKs and STKs while the former always use GTKs and IGTKs.
1032 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1033 * unicast frames can also use key indices like GTKs. Hence, if we
1034 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 1035 *
8dc06a1c
JB		 1036 * Note that in a regular BSS, multicast frames are sent by the
1037 * AP only, associated stations unicast the frame to the AP first
1038 * which then multicasts it on their behalf.
1039 *
3017b80b
JB		 1040 * There is also a slight problem in IBSS mode: GTKs are negotiated
1041 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 1042 * The spec seems to expect that one negotiates the same key with
1043 * every station but there's no such requirement; VLANs could be
1044 * possible.
3017b80b
JB		 1045 */
1046
3017b80b 1047 /*
1990af8d 1048 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 1049 * addressed to us nor a multicast frame.
1050 */
554891e6 1051 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1052 return RX_CONTINUE;
3017b80b 1053
2569a826
JB		 1054 /* start without a key */
1055 rx->key = NULL;
1056
d4e46a3d 1057 if (rx->sta)
e31b8213 1058 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 1059
761ab470
JB		 1060 fc = hdr->frame_control;
1061
1062 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 1063 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1064
e31b8213
JB		 1065 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1066 rx->key = sta_ptk;
dc1580dd
JB		 1067 if ((status->flag & RX_FLAG_DECRYPTED) &&
1068 (status->flag & RX_FLAG_IV_STRIPPED))
1069 return RX_CONTINUE;
0c7c10c7 1070 /* Skip decryption if the frame is not protected. */
761ab470 1071 if (!ieee80211_has_protected(fc))
0c7c10c7 1072 return RX_CONTINUE;
3cfcf6ac
JM		 1073 } else if (mmie_keyidx >= 0) {
1074 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 1075 if ((status->flag & RX_FLAG_DECRYPTED) &&
1076 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 1077 return RX_CONTINUE;
1078
1079 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1080 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1081 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 1082 if (rx->sta)
1083 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1084 if (!rx->key)
1085 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 1086 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 1087 /*
1088 * The frame was not protected, so skip decryption. However, we
1089 * need to set rx->key if there is a key that could have been
1090 * used so that the frame may be dropped if encryption would
1091 * have been expected.
1092 */
1093 struct ieee80211_key *key = NULL;
897bed8b
JB		 1094 struct ieee80211_sub_if_data *sdata = rx->sdata;
1095 int i;
1096
761ab470 1097 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1098 is_multicast_ether_addr(hdr->addr1) &&
1099 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1100 rx->key = key;
897bed8b
JB		 1101 else {
1102 if (rx->sta) {
1103 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1104 key = rcu_dereference(rx->sta->gtk[i]);
1105 if (key)
1106 break;
1107 }
1108 }
1109 if (!key) {
1110 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1111 key = rcu_dereference(sdata->keys[i]);
1112 if (key)
1113 break;
1114 }
1115 }
1116 if (key)
1117 rx->key = key;
1118 }
0c7c10c7 1119 return RX_CONTINUE;
571ecf67 1120 } else {
39184b15 1121 u8 keyid;
3017b80b
JB		 1122 /*
1123 * The device doesn't give us the IV so we won't be
1124 * able to look up the key. That's ok though, we
1125 * don't need to decrypt the frame, we just won't
1126 * be able to keep statistics accurate.
1127 * Except for key threshold notifications, should
1128 * we somehow allow the driver to tell us which key
1129 * the hardware used if this flag is set?
1130 */
eb9fb5b8
JB		 1131 if ((status->flag & RX_FLAG_DECRYPTED) &&
1132 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1133 return RX_CONTINUE;
3017b80b 1134
761ab470 1135 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1136
1137 if (rx->skb->len < 8 + hdrlen)
e4c26add 1138 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1139
1140 /*
1141 * no need to call ieee80211_wep_get_keyidx,
1142 * it verifies a bunch of things we've done already
1143 */
39184b15
ZY		 1144 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1145 keyidx = keyid >> 6;
3017b80b 1146
e31b8213
JB		 1147 /* check per-station GTK first, if multicast packet */
1148 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1149 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1150
e31b8213
JB		 1151 /* if not found, try default key */
1152 if (!rx->key) {
1153 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1154
1155 /*
1156 * RSNA-protected unicast frames should always be
1157 * sent with pairwise or station-to-station keys,
1158 * but for WEP we allow using a key index as well.
1159 */
1160 if (rx->key &&
1161 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1162 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1163 !is_multicast_ether_addr(hdr->addr1))
1164 rx->key = NULL;
1165 }
571ecf67
JB		 1166 }
1167
3017b80b 1168 if (rx->key) {
95acac61
JB		 1169 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1170 return RX_DROP_MONITOR;
1171
571ecf67 1172 rx->key->tx_rx_count++;
011bfcc4 1173 /* TODO: add threshold stuff again */
1990af8d 1174 } else {
e4c26add 1175 return RX_DROP_MONITOR;
70f08765
JB		 1176 }
1177
97359d12
JB		 1178 switch (rx->key->conf.cipher) {
1179 case WLAN_CIPHER_SUITE_WEP40:
1180 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1181 result = ieee80211_crypto_wep_decrypt(rx);
1182 break;
97359d12 1183 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1184 result = ieee80211_crypto_tkip_decrypt(rx);
1185 break;
97359d12 1186 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1187 result = ieee80211_crypto_ccmp_decrypt(rx);
1188 break;
97359d12 1189 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1190 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1191 break;
3ffc2a90
JB		 1192 default:
1193 /*
1194 * We can reach here only with HW-only algorithms
1195 * but why didn't it decrypt the frame?!
1196 */
1197 return RX_DROP_UNUSABLE;
70f08765
JB		 1198 }
1199
a8286911
JB		 1200 /* the hdr variable is invalid after the decrypt handlers */
1201
e2f036da 1202 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1203 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1204
1205 return result;
70f08765
JB		 1206}
1207
572e0012
KV		 1208static ieee80211_rx_result debug_noinline
1209ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1210{
1211 struct ieee80211_local *local;
1212 struct ieee80211_hdr *hdr;
1213 struct sk_buff *skb;
1214
1215 local = rx->local;
1216 skb = rx->skb;
1217 hdr = (struct ieee80211_hdr *) skb->data;
1218
1219 if (!local->pspolling)
1220 return RX_CONTINUE;
1221
1222 if (!ieee80211_has_fromds(hdr->frame_control))
1223 /* this is not from AP */
1224 return RX_CONTINUE;
1225
1226 if (!ieee80211_is_data(hdr->frame_control))
1227 return RX_CONTINUE;
1228
1229 if (!ieee80211_has_moredata(hdr->frame_control)) {
1230 /* AP has no more frames buffered for us */
1231 local->pspolling = false;
1232 return RX_CONTINUE;
1233 }
1234
1235 /* more data bit is set, let's request a new frame from the AP */
1236 ieee80211_send_pspoll(local, rx->sdata);
1237
1238 return RX_CONTINUE;
1239}
1240
d012a605 1241static void sta_ps_start(struct sta_info *sta)
571ecf67 1242{
133b8226 1243 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1244 struct ieee80211_local *local = sdata->local;
d012a605 1245 struct ps_data *ps;
0795af57 1246
d012a605
MP		 1247 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1248 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1249 ps = &sdata->bss->ps;
1250 else
1251 return;
1252
1253 atomic_inc(&ps->num_sta_ps);
c2c98fde 1254 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1255 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1256 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1257 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1258 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1259}
1260
d012a605 1261static void sta_ps_end(struct sta_info *sta)
571ecf67 1262{
bdcbd8e0
JB		 1263 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1264 sta->sta.addr, sta->sta.aid);
004c872e 1265
c2c98fde 1266 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1267 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1268 sta->sta.addr, sta->sta.aid);
af818581
JB		 1269 return;
1270 }
1271
1272 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1273}
1274
d057e5a3
AN		 1275int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1276{
1277 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1278 bool in_ps;
1279
1280 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1281
1282 /* Don't let the same PS state be set twice */
c2c98fde 1283 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1284 if ((start && in_ps) || (!start && !in_ps))
1285 return -EINVAL;
1286
1287 if (start)
d012a605 1288 sta_ps_start(sta_inf);
d057e5a3 1289 else
d012a605 1290 sta_ps_end(sta_inf);
d057e5a3
AN		 1291
1292 return 0;
1293}
1294EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1295
47086fc5
JB		 1296static ieee80211_rx_result debug_noinline
1297ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1298{
1299 struct ieee80211_sub_if_data *sdata = rx->sdata;
1300 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1301 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1302 int tid, ac;
1303
1304 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1305 return RX_CONTINUE;
1306
1307 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1308 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1309 return RX_CONTINUE;
1310
1311 /*
1312 * The device handles station powersave, so don't do anything about
1313 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1314 * it to mac80211 since they're handled.)
1315 */
1316 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1317 return RX_CONTINUE;
1318
1319 /*
1320 * Don't do anything if the station isn't already asleep. In
1321 * the uAPSD case, the station will probably be marked asleep,
1322 * in the PS-Poll case the station must be confused ...
1323 */
c2c98fde 1324 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1325 return RX_CONTINUE;
1326
1327 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1328 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1329 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1330 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1331 else
c2c98fde 1332 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1333 }
47086fc5
JB		 1334
1335 /* Free PS Poll skb here instead of returning RX_DROP that would
1336 * count as an dropped frame. */
1337 dev_kfree_skb(rx->skb);
1338
1339 return RX_QUEUED;
1340 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1341 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1342 ieee80211_has_pm(hdr->frame_control) &&
1343 (ieee80211_is_data_qos(hdr->frame_control) ||
1344 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1345 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1346 ac = ieee802_1d_to_ac[tid & 7];
1347
1348 /*
1349 * If this AC is not trigger-enabled do nothing.
1350 *
1351 * NB: This could/should check a separate bitmap of trigger-
1352 * enabled queues, but for now we only implement uAPSD w/o
1353 * TSPEC changes to the ACs, so they're always the same.
1354 */
1355 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1356 return RX_CONTINUE;
1357
1358 /* if we are in a service period, do nothing */
c2c98fde 1359 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1360 return RX_CONTINUE;
1361
c2c98fde 1362 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1363 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1364 else
c2c98fde 1365 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1366 }
1367
1368 return RX_CONTINUE;
1369}
1370
49461622 1371static ieee80211_rx_result debug_noinline
5cf121c3 1372ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1373{
1374 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1375 struct sk_buff *skb = rx->skb;
1376 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1377 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1378
1379 if (!sta)
9ae54c84 1380 return RX_CONTINUE;
571ecf67 1381
b291ba11
JB		 1382 /*
1383 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1384 * BSSID and for station already AUTHORIZED to avoid keeping the
1385 * current IBSS network alive in cases where other STAs start
1386 * using different BSSID. This will also give the station another
1387 * chance to restart the authentication/authorization in case
1388 * something went wrong the first time.
b291ba11 1389 */
05c914fe 1390 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1391 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1392 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1393 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1394 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1395 sta->last_rx = jiffies;
3af6334c
FF		 1396 if (ieee80211_is_data(hdr->frame_control)) {
1397 sta->last_rx_rate_idx = status->rate_idx;
1398 sta->last_rx_rate_flag = status->flag;
5614618e 1399 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1400 }
1401 }
b291ba11
JB		 1402 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1403 /*
33b64eb2
LCC		 1404 * Mesh beacons will update last_rx when if they are found to
1405 * match the current local configuration when processed.
571ecf67 1406 */
b291ba11 1407 sta->last_rx = jiffies;
3af6334c
FF		 1408 if (ieee80211_is_data(hdr->frame_control)) {
1409 sta->last_rx_rate_idx = status->rate_idx;
1410 sta->last_rx_rate_flag = status->flag;
5614618e 1411 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1412 }
571ecf67
JB		 1413 }
1414
554891e6 1415 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1416 return RX_CONTINUE;
571ecf67 1417
3cf335d5
KV		 1418 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1419 ieee80211_sta_rx_notify(rx->sdata, hdr);
1420
571ecf67
JB		 1421 sta->rx_fragments++;
1422 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1423 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1424 sta->last_signal = status->signal;
1425 ewma_add(&sta->avg_signal, -status->signal);
1426 }
571ecf67 1427
72eaa43a
JB		 1428 /*
1429 * Change STA power saving mode only at the end of a frame
1430 * exchange sequence.
1431 */
d057e5a3
AN		 1432 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1433 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1434 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1435 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1436 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1437 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1438 /*
1439 * Ignore doze->wake transitions that are
1440 * indicated by non-data frames, the standard
1441 * is unclear here, but for example going to
1442 * PS mode and then scanning would cause a
1443 * doze->wake transition for the probe request,
1444 * and that is clearly undesirable.
1445 */
1446 if (ieee80211_is_data(hdr->frame_control) &&
1447 !ieee80211_has_pm(hdr->frame_control))
d012a605 1448 sta_ps_end(sta);
72eaa43a
JB		 1449 } else {
1450 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1451 sta_ps_start(sta);
72eaa43a 1452 }
571ecf67
JB		 1453 }
1454
22403def
JB		 1455 /*
1456 * Drop (qos-)data::nullfunc frames silently, since they
1457 * are used only to control station power saving mode.
1458 */
1459 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1460 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1461 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1462
1463 /*
1464 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1465 * that was not moved to a 4-addr STA vlan yet send
1466 * the event to userspace and for older hostapd drop
1467 * the frame to the monitor interface.
d524215f
FF		 1468 */
1469 if (ieee80211_has_a4(hdr->frame_control) &&
1470 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1471 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1472 !rx->sdata->u.vlan.sta))) {
1473 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1474 cfg80211_rx_unexpected_4addr_frame(
1475 rx->sdata->dev, sta->sta.addr,
1476 GFP_ATOMIC);
d524215f 1477 return RX_DROP_MONITOR;
e7f4a940 1478 }
22403def
JB		 1479 /*
1480 * Update counter and free packet here to avoid
1481 * counting this as a dropped packed.
1482 */
571ecf67
JB		 1483 sta->rx_packets++;
1484 dev_kfree_skb(rx->skb);
9ae54c84 1485 return RX_QUEUED;
571ecf67
JB		 1486 }
1487
9ae54c84 1488 return RX_CONTINUE;
571ecf67
JB		 1489} /* ieee80211_rx_h_sta_process */
1490
571ecf67
JB		 1491static inline struct ieee80211_fragment_entry *
1492ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1493 unsigned int frag, unsigned int seq, int rx_queue,
1494 struct sk_buff **skb)
1495{
1496 struct ieee80211_fragment_entry *entry;
571ecf67 1497
571ecf67
JB		 1498 entry = &sdata->fragments[sdata->fragment_next++];
1499 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1500 sdata->fragment_next = 0;
1501
bdcbd8e0 1502 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1503 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1504
1505 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1506 *skb = NULL;
1507 entry->first_frag_time = jiffies;
1508 entry->seq = seq;
1509 entry->rx_queue = rx_queue;
1510 entry->last_frag = frag;
1511 entry->ccmp = 0;
1512 entry->extra_len = 0;
1513
1514 return entry;
1515}
1516
1517static inline struct ieee80211_fragment_entry *
1518ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1519 unsigned int frag, unsigned int seq,
571ecf67
JB		 1520 int rx_queue, struct ieee80211_hdr *hdr)
1521{
1522 struct ieee80211_fragment_entry *entry;
1523 int i, idx;
1524
1525 idx = sdata->fragment_next;
1526 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1527 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1528
1529 idx--;
1530 if (idx < 0)
1531 idx = IEEE80211_FRAGMENT_MAX - 1;
1532
1533 entry = &sdata->fragments[idx];
1534 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1535 entry->rx_queue != rx_queue ||
1536 entry->last_frag + 1 != frag)
1537 continue;
1538
b73d70ad 1539 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1540
b73d70ad
HH		 1541 /*
1542 * Check ftype and addresses are equal, else check next fragment
1543 */
1544 if (((hdr->frame_control ^ f_hdr->frame_control) &
1545 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1546 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1547 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1548 continue;
1549
ab46623e 1550 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1551 __skb_queue_purge(&entry->skb_list);
1552 continue;
1553 }
1554 return entry;
1555 }
1556
1557 return NULL;
1558}
1559
49461622 1560static ieee80211_rx_result debug_noinline
5cf121c3 1561ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1562{
1563 struct ieee80211_hdr *hdr;
1564 u16 sc;
358c8d9d 1565 __le16 fc;
571ecf67
JB		 1566 unsigned int frag, seq;
1567 struct ieee80211_fragment_entry *entry;
1568 struct sk_buff *skb;
554891e6 1569 struct ieee80211_rx_status *status;
571ecf67 1570
b73d70ad 1571 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1572 fc = hdr->frame_control;
f7fbf70e
JC		 1573
1574 if (ieee80211_is_ctl(fc))
1575 return RX_CONTINUE;
1576
571ecf67
JB		 1577 sc = le16_to_cpu(hdr->seq_ctrl);
1578 frag = sc & IEEE80211_SCTL_FRAG;
1579
358c8d9d 1580 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1581 is_multicast_ether_addr(hdr->addr1))) {
1582 /* not fragmented */
1583 goto out;
1584 }
1585 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1586
e3cf8b3f
ZY		 1587 if (skb_linearize(rx->skb))
1588 return RX_DROP_UNUSABLE;
1589
058897a4
AK		 1590 /*
1591 * skb_linearize() might change the skb->data and
1592 * previously cached variables (in this case, hdr) need to
1593 * be refreshed with the new data.
1594 */
1595 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1596 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1597
1598 if (frag == 0) {
1599 /* This is the first fragment of a new frame. */
1600 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1601 rx->seqno_idx, &(rx->skb));
97359d12 1602 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1603 ieee80211_has_protected(fc)) {
9e26297a 1604 int queue = rx->security_idx;
571ecf67
JB		 1605 /* Store CCMP PN so that we can verify that the next
1606 * fragment has a sequential PN value. */
1607 entry->ccmp = 1;
1608 memcpy(entry->last_pn,
9190252c 1609 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1610 CCMP_PN_LEN);
1611 }
9ae54c84 1612 return RX_QUEUED;
571ecf67
JB		 1613 }
1614
1615 /* This is a fragment for a frame that should already be pending in
1616 * fragment cache. Add this fragment to the end of the pending entry.
1617 */
9e26297a
JB		 1618 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1619 rx->seqno_idx, hdr);
571ecf67
JB		 1620 if (!entry) {
1621 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1622 return RX_DROP_MONITOR;
571ecf67
JB		 1623 }
1624
1625 /* Verify that MPDUs within one MSDU have sequential PN values.
1626 * (IEEE 802.11i, 8.3.3.4.5) */
1627 if (entry->ccmp) {
1628 int i;
1629 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1630 int queue;
97359d12 1631 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1632 return RX_DROP_UNUSABLE;
571ecf67
JB		 1633 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1634 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1635 pn[i]++;
1636 if (pn[i])
1637 break;
1638 }
9e26297a 1639 queue = rx->security_idx;
9190252c 1640 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1641 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1642 return RX_DROP_UNUSABLE;
571ecf67
JB		 1643 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1644 }
1645
358c8d9d 1646 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1647 __skb_queue_tail(&entry->skb_list, rx->skb);
1648 entry->last_frag = frag;
1649 entry->extra_len += rx->skb->len;
358c8d9d 1650 if (ieee80211_has_morefrags(fc)) {
571ecf67 1651 rx->skb = NULL;
9ae54c84 1652 return RX_QUEUED;
571ecf67
JB		 1653 }
1654
1655 rx->skb = __skb_dequeue(&entry->skb_list);
1656 if (skb_tailroom(rx->skb) < entry->extra_len) {
1657 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1658 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1659 GFP_ATOMIC))) {
1660 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1661 __skb_queue_purge(&entry->skb_list);
e4c26add 1662 return RX_DROP_UNUSABLE;
571ecf67
JB		 1663 }
1664 }
1665 while ((skb = __skb_dequeue(&entry->skb_list))) {
1666 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1667 dev_kfree_skb(skb);
1668 }
1669
1670 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1671 status = IEEE80211_SKB_RXCB(rx->skb);
1672 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1673
1674 out:
1675 if (rx->sta)
1676 rx->sta->rx_packets++;
1677 if (is_multicast_ether_addr(hdr->addr1))
1678 rx->local->dot11MulticastReceivedFrameCount++;
1679 else
1680 ieee80211_led_rx(rx->local);
9ae54c84 1681 return RX_CONTINUE;
571ecf67
JB		 1682}
1683
1df332e8 1684static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1685{
1df332e8 1686 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1687 return -EACCES;
571ecf67 1688
76ee65bf 1689 return 0;
571ecf67
JB		 1690}
1691
1df332e8 1692static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1693{
eb9fb5b8
JB		 1694 struct sk_buff *skb = rx->skb;
1695 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1696
3017b80b 1697 /*
7848ba7d
JB		 1698 * Pass through unencrypted frames if the hardware has
1699 * decrypted them already.
3017b80b 1700 */
eb9fb5b8 1701 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1702 return 0;
571ecf67
JB		 1703
1704 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1705 if (unlikely(!ieee80211_has_protected(fc) &&
1706 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1707 ieee80211_is_data(fc) &&
b3fc9c6c 1708 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1709 return -EACCES;
bef5d1c7
JB		 1710
1711 return 0;
1712}
1713
1df332e8 1714static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1715{
1716 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1717 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1718 __le16 fc = hdr->frame_control;
bef5d1c7 1719
e3efca0a
JM		 1720 /*
1721 * Pass through unencrypted frames if the hardware has
1722 * decrypted them already.
1723 */
1724 if (status->flag & RX_FLAG_DECRYPTED)
1725 return 0;
bef5d1c7 1726
c2c98fde 1727 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1728 if (unlikely(!ieee80211_has_protected(fc) &&
1729 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1730 rx->key)) {
1731 if (ieee80211_is_deauth(fc))
1732 cfg80211_send_unprot_deauth(rx->sdata->dev,
1733 rx->skb->data,
1734 rx->skb->len);
1735 else if (ieee80211_is_disassoc(fc))
1736 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1737 rx->skb->data,
1738 rx->skb->len);
f2ca3ea4 1739 return -EACCES;
cf4e594e 1740 }
f2ca3ea4 1741 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1742 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1743 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1744 if (ieee80211_is_deauth(fc))
1745 cfg80211_send_unprot_deauth(rx->sdata->dev,
1746 rx->skb->data,
1747 rx->skb->len);
1748 else if (ieee80211_is_disassoc(fc))
1749 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1750 rx->skb->data,
1751 rx->skb->len);
f2ca3ea4 1752 return -EACCES;
cf4e594e 1753 }
f2ca3ea4
JM		 1754 /*
1755 * When using MFP, Action frames are not allowed prior to
1756 * having configured keys.
1757 */
1758 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1759 ieee80211_is_robust_mgmt_frame(
1760 (struct ieee80211_hdr *) rx->skb->data)))
1761 return -EACCES;
1762 }
b3fc9c6c 1763
76ee65bf 1764 return 0;
571ecf67
JB		 1765}
1766
76ee65bf 1767static int
4114fa21 1768__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1769{
eb9fb5b8 1770 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1771 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1772 bool check_port_control = false;
1773 struct ethhdr *ehdr;
1774 int ret;
f14543ee 1775
4114fa21 1776 *port_control = false;
9bc383de
JB		 1777 if (ieee80211_has_a4(hdr->frame_control) &&
1778 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1779 return -1;
9bc383de 1780
fbb327c5
FF		 1781 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1782 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1783
1784 if (!sdata->u.mgd.use_4addr)
1785 return -1;
1786 else
1787 check_port_control = true;
1788 }
1789
9bc383de 1790 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1791 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1792 return -1;
571ecf67 1793
fbb327c5 1794 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1795 if (ret < 0)
fbb327c5
FF		 1796 return ret;
1797
1798 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1799 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1800 *port_control = true;
1801 else if (check_port_control)
fbb327c5
FF		 1802 return -1;
1803
1804 return 0;
76ee65bf 1805}
571ecf67 1806
ce3edf6d
JB		 1807/*
1808 * requires that rx->skb is a frame with ethernet header
1809 */
358c8d9d 1810static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1811{
c97c23e3 1812 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1813 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1814 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1815
1816 /*
1817 * Allow EAPOL frames to us/the PAE group address regardless
1818 * of whether the frame was encrypted or not.
1819 */
a621fa4d 1820 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1821 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1822 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1823 return true;
1824
1825 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1826 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1827 return false;
1828
1829 return true;
1830}
1831
1832/*
1833 * requires that rx->skb is a frame with ethernet header
1834 */
76ee65bf 1835static void
5cf121c3 1836ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1837{
eb9fb5b8
JB		 1838 struct ieee80211_sub_if_data *sdata = rx->sdata;
1839 struct net_device *dev = sdata->dev;
76ee65bf 1840 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1841 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1842 struct sta_info *dsta;
554891e6 1843 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1844
76ee65bf
RR		 1845 skb = rx->skb;
1846 xmit_skb = NULL;
571ecf67 1847
05c914fe
JB		 1848 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1849 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1850 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1851 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1852 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1853 if (is_multicast_ether_addr(ehdr->h_dest)) {
1854 /*
1855 * send multicast frames both to higher layers in
1856 * local net stack and back to the wireless medium
1857 */
76ee65bf 1858 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1859 if (!xmit_skb)
bdcbd8e0 1860 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1861 dev->name);
571ecf67 1862 } else {
abe60632
JB		 1863 dsta = sta_info_get(sdata, skb->data);
1864 if (dsta) {
ce3edf6d
JB		 1865 /*
1866 * The destination station is associated to
1867 * this AP (in this VLAN), so send the frame
1868 * directly to it and do not pass it to local
1869 * net stack.
571ecf67 1870 */
76ee65bf 1871 xmit_skb = skb;
571ecf67
JB		 1872 skb = NULL;
1873 }
571ecf67
JB		 1874 }
1875 }
1876
1877 if (skb) {
d1c3a37c
JB		 1878 int align __maybe_unused;
1879
59d9cb07 1880#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1881 /*
1882 * 'align' will only take the values 0 or 2 here
1883 * since all frames are required to be aligned
1884 * to 2-byte boundaries when being passed to
1885 * mac80211. That also explains the __skb_push()
1886 * below.
1887 */
dacb6f1d 1888 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1889 if (align) {
1890 if (WARN_ON(skb_headroom(skb) < 3)) {
1891 dev_kfree_skb(skb);
1892 skb = NULL;
1893 } else {
1894 u8 *data = skb->data;
8ce0b589
ZY		 1895 size_t len = skb_headlen(skb);
1896 skb->data -= align;
1897 memmove(skb->data, data, len);
1898 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1899 }
1900 }
1901#endif
1902
1903 if (skb) {
1904 /* deliver to local stack */
1905 skb->protocol = eth_type_trans(skb, dev);
1906 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1907 netif_receive_skb(skb);
d1c3a37c 1908 }
571ecf67
JB		 1909 }
1910
76ee65bf 1911 if (xmit_skb) {
aef6c928
HS		 1912 /*
1913 * Send to wireless media and increase priority by 256 to
1914 * keep the received priority instead of reclassifying
1915 * the frame (see cfg80211_classify8021d).
1916 */
1917 xmit_skb->priority += 256;
f831e909 1918 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1919 skb_reset_network_header(xmit_skb);
1920 skb_reset_mac_header(xmit_skb);
76ee65bf 1921 dev_queue_xmit(xmit_skb);
571ecf67 1922 }
76ee65bf
RR		 1923}
1924
49461622 1925static ieee80211_rx_result debug_noinline
5cf121c3 1926ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1927{
eb9fb5b8 1928 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1929 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1930 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1931 __le16 fc = hdr->frame_control;
eaf85ca7 1932 struct sk_buff_head frame_list;
554891e6 1933 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1934
358c8d9d 1935 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1936 return RX_CONTINUE;
fd4c7f2f 1937
358c8d9d 1938 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1939 return RX_DROP_MONITOR;
fd4c7f2f 1940
554891e6 1941 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1942 return RX_CONTINUE;
fd4c7f2f 1943
eaf85ca7
ZY		 1944 if (ieee80211_has_a4(hdr->frame_control) &&
1945 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1946 !rx->sdata->u.vlan.sta)
e4c26add 1947 return RX_DROP_UNUSABLE;
fd4c7f2f 1948
eaf85ca7
ZY		 1949 if (is_multicast_ether_addr(hdr->addr1) &&
1950 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1951 rx->sdata->u.vlan.sta) ||
1952 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1953 rx->sdata->u.mgd.use_4addr)))
e4c26add 1954 return RX_DROP_UNUSABLE;
fd4c7f2f 1955
eaf85ca7
ZY		 1956 skb->dev = dev;
1957 __skb_queue_head_init(&frame_list);
fd4c7f2f 1958
e3cf8b3f
ZY		 1959 if (skb_linearize(skb))
1960 return RX_DROP_UNUSABLE;
1961
eaf85ca7
ZY		 1962 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1963 rx->sdata->vif.type,
8b3becad 1964 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1965
eaf85ca7
ZY		 1966 while (!skb_queue_empty(&frame_list)) {
1967 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1968
358c8d9d 1969 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1970 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1971 continue;
1972 }
eaf85ca7
ZY		 1973 dev->stats.rx_packets++;
1974 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1975
1976 ieee80211_deliver_skb(rx);
1977 }
1978
9ae54c84 1979 return RX_QUEUED;
fd4c7f2f
RR		 1980}
1981
bf94e17b 1982#ifdef CONFIG_MAC80211_MESH
b0dee578 1983static ieee80211_rx_result
e32f85f7
LCC		 1984ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1985{
30789eb6
TP		 1986 struct ieee80211_hdr *fwd_hdr, *hdr;
1987 struct ieee80211_tx_info *info;
e32f85f7 1988 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1989 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1990 struct ieee80211_local *local = rx->local;
eb9fb5b8 1991 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1992 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1993 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1994 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1995 u16 q, hdrlen;
e32f85f7
LCC		 1996
1997 hdr = (struct ieee80211_hdr *) skb->data;
1998 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 1999
2000 /* make sure fixed part of mesh header is there, also checks skb len */
2001 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2002 return RX_DROP_MONITOR;
2003
2004 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2005
2006 /* make sure full mesh header is there, also checks skb len */
2007 if (!pskb_may_pull(rx->skb,
2008 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2009 return RX_DROP_MONITOR;
2010
2011 /* reload pointers */
2012 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2013 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2014
2157fdd6
TP		 2015 /* frame is in RMC, don't forward */
2016 if (ieee80211_is_data(hdr->frame_control) &&
2017 is_multicast_ether_addr(hdr->addr1) &&
2018 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
2019 return RX_DROP_MONITOR;
2020
555cb715
JC		 2021 if (!ieee80211_is_data(hdr->frame_control) ||
2022 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2023 return RX_CONTINUE;
2024
2025 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2026 return RX_DROP_MONITOR;
2027
43b7b314 2028 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2029 struct mesh_path *mppath;
43b7b314
JC		 2030 char *proxied_addr;
2031 char *mpp_addr;
2032
2033 if (is_multicast_ether_addr(hdr->addr1)) {
2034 mpp_addr = hdr->addr3;
2035 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2036 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2037 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2038 mpp_addr = hdr->addr4;
2039 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2040 } else {
2041 return RX_DROP_MONITOR;
43b7b314 2042 }
79617dee 2043
79617dee 2044 rcu_read_lock();
43b7b314 2045 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 2046 if (!mppath) {
43b7b314 2047 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 2048 } else {
2049 spin_lock_bh(&mppath->state_lock);
b203ca39 2050 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2051 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2052 spin_unlock_bh(&mppath->state_lock);
2053 }
2054 rcu_read_unlock();
2055 }
2056
3c5772a5
JC		 2057 /* Frame has reached destination. Don't forward */
2058 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2059 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2060 return RX_CONTINUE;
2061
00e96dec 2062 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2063 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2064 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2065 return RX_DROP_MONITOR;
2066 }
2067 skb_set_queue_mapping(skb, q);
e32f85f7 2068
30789eb6
TP		 2069 if (!--mesh_hdr->ttl) {
2070 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2071 goto out;
30789eb6
TP		 2072 }
2073
d665508b
CYY		 2074 if (!ifmsh->mshcfg.dot11MeshForwarding)
2075 goto out;
2076
30789eb6
TP		 2077 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2078 if (!fwd_skb) {
bdcbd8e0 2079 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2080 sdata->name);
30789eb6
TP		 2081 goto out;
2082 }
2083
2084 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2085 info = IEEE80211_SKB_CB(fwd_skb);
2086 memset(info, 0, sizeof(*info));
2087 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2088 info->control.vif = &rx->sdata->vif;
2089 info->control.jiffies = jiffies;
2090 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2091 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2092 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2093 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
2094 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2095 } else {
2096 /* unable to resolve next hop */
2097 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1df332e8 2098 0, reason, fwd_hdr->addr2, sdata);
30789eb6 2099 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2100 kfree_skb(fwd_skb);
30789eb6 2101 return RX_DROP_MONITOR;
e32f85f7
LCC		 2102 }
2103
30789eb6
TP		 2104 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2105 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2106 out:
3c5772a5 2107 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2108 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2109 return RX_CONTINUE;
2110 else
2111 return RX_DROP_MONITOR;
2112}
bf94e17b 2113#endif
e32f85f7 2114
49461622 2115static ieee80211_rx_result debug_noinline
5cf121c3 2116ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2117{
eb9fb5b8 2118 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2119 struct ieee80211_local *local = rx->local;
eb9fb5b8 2120 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2121 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2122 __le16 fc = hdr->frame_control;
4114fa21 2123 bool port_control;
ce3edf6d 2124 int err;
76ee65bf 2125
358c8d9d 2126 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2127 return RX_CONTINUE;
76ee65bf 2128
358c8d9d 2129 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2130 return RX_DROP_MONITOR;
76ee65bf 2131
f14543ee 2132 /*
e7f4a940
JB		 2133 * Send unexpected-4addr-frame event to hostapd. For older versions,
2134 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2135 */
2136 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2137 sdata->vif.type == NL80211_IFTYPE_AP) {
2138 if (rx->sta &&
2139 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2140 cfg80211_rx_unexpected_4addr_frame(
2141 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2142 return RX_DROP_MONITOR;
e7f4a940 2143 }
f14543ee 2144
4114fa21 2145 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2146 if (unlikely(err))
e4c26add 2147 return RX_DROP_UNUSABLE;
76ee65bf 2148
358c8d9d 2149 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2150 return RX_DROP_MONITOR;
ce3edf6d 2151
4114fa21
FF		 2152 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2153 unlikely(port_control) && sdata->bss) {
2154 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2155 u.ap);
2156 dev = sdata->dev;
2157 rx->sdata = sdata;
2158 }
2159
76ee65bf
RR		 2160 rx->skb->dev = dev;
2161
2162 dev->stats.rx_packets++;
2163 dev->stats.rx_bytes += rx->skb->len;
2164
08ca944e 2165 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2166 !is_multicast_ether_addr(
2167 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2168 (!local->scanning &&
2169 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2170 mod_timer(&local->dynamic_ps_timer, jiffies +
2171 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2172 }
2173
76ee65bf 2174 ieee80211_deliver_skb(rx);
571ecf67 2175
9ae54c84 2176 return RX_QUEUED;
571ecf67
JB		 2177}
2178
49461622 2179static ieee80211_rx_result debug_noinline
24a8fdad 2180ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2181{
71364716 2182 struct sk_buff *skb = rx->skb;
a7767f95 2183 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2184 struct tid_ampdu_rx *tid_agg_rx;
2185 u16 start_seq_num;
2186 u16 tid;
2187
a7767f95 2188 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2189 return RX_CONTINUE;
71364716 2190
a7767f95 2191 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2192 struct {
2193 __le16 control, start_seq_num;
2194 } __packed bar_data;
2195
71364716 2196 if (!rx->sta)
a02ae758 2197 return RX_DROP_MONITOR;
8ae5977f
JB		 2198
2199 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2200 &bar_data, sizeof(bar_data)))
2201 return RX_DROP_MONITOR;
2202
8ae5977f 2203 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2204
2205 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2206 if (!tid_agg_rx)
a02ae758 2207 return RX_DROP_MONITOR;
71364716 2208
8ae5977f 2209 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2210
2211 /* reset session timer */
20ad19d0
JB		 2212 if (tid_agg_rx->timeout)
2213 mod_timer(&tid_agg_rx->session_timer,
2214 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2215
dd318575 2216 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2217 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2218 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2219 start_seq_num);
dd318575
JB		 2220 spin_unlock(&tid_agg_rx->reorder_lock);
2221
a02ae758
JB		 2222 kfree_skb(skb);
2223 return RX_QUEUED;
71364716
RR		 2224 }
2225
08daecae
JB		 2226 /*
2227 * After this point, we only want management frames,
2228 * so we can drop all remaining control frames to
2229 * cooked monitor interfaces.
2230 */
2231 return RX_DROP_MONITOR;
71364716
RR		 2232}
2233
f4f727a6
JM		 2234static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2235 struct ieee80211_mgmt *mgmt,
2236 size_t len)
fea14732
JM		 2237{
2238 struct ieee80211_local *local = sdata->local;
2239 struct sk_buff *skb;
2240 struct ieee80211_mgmt *resp;
2241
b203ca39 2242 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2243 /* Not to own unicast address */
2244 return;
2245 }
2246
b203ca39
JP		 2247 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2248 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2249 /* Not from the current AP or not associated yet. */
fea14732
JM		 2250 return;
2251 }
2252
2253 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2254 /* Too short SA Query request frame */
2255 return;
2256 }
2257
2258 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2259 if (skb == NULL)
2260 return;
2261
2262 skb_reserve(skb, local->hw.extra_tx_headroom);
2263 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2264 memset(resp, 0, 24);
2265 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2266 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2267 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2268 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2269 IEEE80211_STYPE_ACTION);
2270 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2271 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2272 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2273 memcpy(resp->u.action.u.sa_query.trans_id,
2274 mgmt->u.action.u.sa_query.trans_id,
2275 WLAN_SA_QUERY_TR_ID_LEN);
2276
62ae67be 2277 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2278}
2279
2e161f78
JB		 2280static ieee80211_rx_result debug_noinline
2281ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2282{
2283 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2284 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2285
2286 /*
2287 * From here on, look only at management frames.
2288 * Data and control frames are already handled,
2289 * and unknown (reserved) frames are useless.
2290 */
2291 if (rx->skb->len < 24)
2292 return RX_DROP_MONITOR;
2293
2294 if (!ieee80211_is_mgmt(mgmt->frame_control))
2295 return RX_DROP_MONITOR;
2296
ee971924
JB		 2297 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2298 ieee80211_is_beacon(mgmt->frame_control) &&
2299 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2300 int sig = 0;
2301
2302 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2303 sig = status->signal;
2304
ee971924
JB		 2305 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2306 rx->skb->data, rx->skb->len,
37c73b5f 2307 status->freq, sig);
ee971924
JB		 2308 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2309 }
2310
554891e6 2311 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2312 return RX_DROP_MONITOR;
2313
2314 if (ieee80211_drop_unencrypted_mgmt(rx))
2315 return RX_DROP_UNUSABLE;
2316
2317 return RX_CONTINUE;
2318}
2319
de1ede7a
JB		 2320static ieee80211_rx_result debug_noinline
2321ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2322{
2323 struct ieee80211_local *local = rx->local;
eb9fb5b8 2324 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2325 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2326 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2327 int len = rx->skb->len;
2328
2329 if (!ieee80211_is_action(mgmt->frame_control))
2330 return RX_CONTINUE;
2331
026331c4
JM		 2332 /* drop too small frames */
2333 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2334 return RX_DROP_UNUSABLE;
de1ede7a 2335
026331c4 2336 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2337 return RX_DROP_UNUSABLE;
de1ede7a 2338
554891e6 2339 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2340 return RX_DROP_UNUSABLE;
97ebe12a 2341
de1ede7a 2342 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2343 case WLAN_CATEGORY_HT:
2344 /* reject HT action frames from stations not supporting HT */
2345 if (!rx->sta->sta.ht_cap.ht_supported)
2346 goto invalid;
2347
2348 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2349 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2350 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2351 sdata->vif.type != NL80211_IFTYPE_AP &&
2352 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2353 break;
2354
2355 /* verify action & smps_control are present */
2356 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2357 goto invalid;
2358
2359 switch (mgmt->u.action.u.ht_smps.action) {
2360 case WLAN_HT_ACTION_SMPS: {
2361 struct ieee80211_supported_band *sband;
2362 u8 smps;
2363
2364 /* convert to HT capability */
2365 switch (mgmt->u.action.u.ht_smps.smps_control) {
2366 case WLAN_HT_SMPS_CONTROL_DISABLED:
2367 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2368 break;
2369 case WLAN_HT_SMPS_CONTROL_STATIC:
2370 smps = WLAN_HT_CAP_SM_PS_STATIC;
2371 break;
2372 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2373 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2374 break;
2375 default:
2376 goto invalid;
2377 }
2378 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2379
2380 /* if no change do nothing */
2381 if ((rx->sta->sta.ht_cap.cap &
2382 IEEE80211_HT_CAP_SM_PS) == smps)
2383 goto handled;
2384
2385 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2386 rx->sta->sta.ht_cap.cap |= smps;
2387
2388 sband = rx->local->hw.wiphy->bands[status->band];
2389
64f68e5d
JB		 2390 rate_control_rate_update(local, sband, rx->sta,
2391 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2392 goto handled;
2393 }
2394 default:
2395 goto invalid;
2396 }
2397
2398 break;
de1ede7a 2399 case WLAN_CATEGORY_BACK:
8abd3f9b 2400 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2401 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2402 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2403 sdata->vif.type != NL80211_IFTYPE_AP &&
2404 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2405 break;
8abd3f9b 2406
026331c4
JM		 2407 /* verify action_code is present */
2408 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2409 break;
2410
de1ede7a
JB		 2411 switch (mgmt->u.action.u.addba_req.action_code) {
2412 case WLAN_ACTION_ADDBA_REQ:
2413 if (len < (IEEE80211_MIN_ACTION_SIZE +
2414 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2415 goto invalid;
2416 break;
de1ede7a
JB		 2417 case WLAN_ACTION_ADDBA_RESP:
2418 if (len < (IEEE80211_MIN_ACTION_SIZE +
2419 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2420 goto invalid;
2421 break;
de1ede7a
JB		 2422 case WLAN_ACTION_DELBA:
2423 if (len < (IEEE80211_MIN_ACTION_SIZE +
2424 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2425 goto invalid;
2426 break;
2427 default:
2428 goto invalid;
de1ede7a 2429 }
bed7ee6e 2430
8b58ff83 2431 goto queue;
39192c0b 2432 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2433 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2434 break;
46900298
JB		 2435
2436 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2437 break;
46900298 2438
026331c4
JM		 2439 /* verify action_code is present */
2440 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2441 break;
2442
39192c0b
JB		 2443 switch (mgmt->u.action.u.measurement.action_code) {
2444 case WLAN_ACTION_SPCT_MSR_REQ:
2445 if (len < (IEEE80211_MIN_ACTION_SIZE +
2446 sizeof(mgmt->u.action.u.measurement)))
84040805 2447 break;
39192c0b 2448 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2449 goto handled;
c481ec97
S		 2450 case WLAN_ACTION_SPCT_CHL_SWITCH:
2451 if (len < (IEEE80211_MIN_ACTION_SIZE +
2452 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2453 break;
c481ec97 2454
cc32abd4 2455 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2456 break;
cc32abd4 2457
b203ca39 2458 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2459 break;
c481ec97 2460
8b58ff83 2461 goto queue;
39192c0b
JB		 2462 }
2463 break;
fea14732
JM		 2464 case WLAN_CATEGORY_SA_QUERY:
2465 if (len < (IEEE80211_MIN_ACTION_SIZE +
2466 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2467 break;
2468
fea14732
JM		 2469 switch (mgmt->u.action.u.sa_query.action) {
2470 case WLAN_ACTION_SA_QUERY_REQUEST:
2471 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2472 break;
fea14732 2473 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2474 goto handled;
fea14732
JM		 2475 }
2476 break;
8db09850 2477 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2478 if (len < (IEEE80211_MIN_ACTION_SIZE +
2479 sizeof(mgmt->u.action.u.self_prot.action_code)))
2480 break;
2481
8db09850
TP		 2482 switch (mgmt->u.action.u.self_prot.action_code) {
2483 case WLAN_SP_MESH_PEERING_OPEN:
2484 case WLAN_SP_MESH_PEERING_CLOSE:
2485 case WLAN_SP_MESH_PEERING_CONFIRM:
2486 if (!ieee80211_vif_is_mesh(&sdata->vif))
2487 goto invalid;
2488 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2489 /* userspace handles this frame */
2490 break;
2491 goto queue;
2492 case WLAN_SP_MGK_INFORM:
2493 case WLAN_SP_MGK_ACK:
2494 if (!ieee80211_vif_is_mesh(&sdata->vif))
2495 goto invalid;
2496 break;
2497 }
2498 break;
d3aaec8a 2499 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2500 if (len < (IEEE80211_MIN_ACTION_SIZE +
2501 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2502 break;
2503
77a121c3
JB		 2504 if (!ieee80211_vif_is_mesh(&sdata->vif))
2505 break;
25d49e4d 2506 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2507 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2508 break;
2509 goto queue;
84040805 2510 }
026331c4 2511
2e161f78
JB		 2512 return RX_CONTINUE;
2513
bed7ee6e 2514 invalid:
554891e6 2515 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2516 /* will return in the next handlers */
2517 return RX_CONTINUE;
2518
2519 handled:
2520 if (rx->sta)
2521 rx->sta->rx_packets++;
2522 dev_kfree_skb(rx->skb);
2523 return RX_QUEUED;
2524
2525 queue:
2526 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2527 skb_queue_tail(&sdata->skb_queue, rx->skb);
2528 ieee80211_queue_work(&local->hw, &sdata->work);
2529 if (rx->sta)
2530 rx->sta->rx_packets++;
2531 return RX_QUEUED;
2532}
2533
2534static ieee80211_rx_result debug_noinline
2535ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2536{
554891e6 2537 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2538 int sig = 0;
2e161f78
JB		 2539
2540 /* skip known-bad action frames and return them in the next handler */
554891e6 2541 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2542 return RX_CONTINUE;
d7907448 2543
026331c4
JM		 2544 /*
2545 * Getting here means the kernel doesn't know how to handle
2546 * it, but maybe userspace does ... include returned frames
2547 * so userspace can register for those to know whether ones
2548 * it transmitted were processed or returned.
2549 */
026331c4 2550
804483e9
JB		 2551 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2552 sig = status->signal;
2553
71bbc994 2554 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2555 rx->skb->data, rx->skb->len,
2556 GFP_ATOMIC)) {
2557 if (rx->sta)
2558 rx->sta->rx_packets++;
2559 dev_kfree_skb(rx->skb);
2560 return RX_QUEUED;
2561 }
2562
2e161f78
JB		 2563 return RX_CONTINUE;
2564}
2565
2566static ieee80211_rx_result debug_noinline
2567ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2568{
2569 struct ieee80211_local *local = rx->local;
2570 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2571 struct sk_buff *nskb;
2572 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2573 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2574
2575 if (!ieee80211_is_action(mgmt->frame_control))
2576 return RX_CONTINUE;
2577
2578 /*
2579 * For AP mode, hostapd is responsible for handling any action
2580 * frames that we didn't handle, including returning unknown
2581 * ones. For all other modes we will return them to the sender,
2582 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2583 * 802.11-2012 9.24.4.
2e161f78
JB		 2584 * Newer versions of hostapd shall also use the management frame
2585 * registration mechanisms, but older ones still use cooked
2586 * monitor interfaces so push all frames there.
2587 */
554891e6 2588 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2589 (sdata->vif.type == NL80211_IFTYPE_AP ||
2590 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2591 return RX_DROP_MONITOR;
026331c4 2592
4b5ebccc
JB		 2593 if (is_multicast_ether_addr(mgmt->da))
2594 return RX_DROP_MONITOR;
2595
84040805
JB		 2596 /* do not return rejected action frames */
2597 if (mgmt->u.action.category & 0x80)
2598 return RX_DROP_UNUSABLE;
2599
2600 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2601 GFP_ATOMIC);
2602 if (nskb) {
292b4df6 2603 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2604
292b4df6
JL		 2605 nmgmt->u.action.category |= 0x80;
2606 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2607 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2608
2609 memset(nskb->cb, 0, sizeof(nskb->cb));
2610
2611 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2612 }
39192c0b
JB		 2613 dev_kfree_skb(rx->skb);
2614 return RX_QUEUED;
de1ede7a
JB		 2615}
2616
49461622 2617static ieee80211_rx_result debug_noinline
5cf121c3 2618ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2619{
eb9fb5b8 2620 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2621 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2622 __le16 stype;
571ecf67 2623
77a121c3 2624 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2625
77a121c3
JB		 2626 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2627 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2628 sdata->vif.type != NL80211_IFTYPE_STATION)
2629 return RX_DROP_MONITOR;
472dbc45 2630
77a121c3 2631 switch (stype) {
66e67e41 2632 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2633 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2634 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2635 /* process for all: mesh, mlme, ibss */
2636 break;
66e67e41
JB		 2637 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2638 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2639 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2640 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2641 if (is_multicast_ether_addr(mgmt->da) &&
2642 !is_broadcast_ether_addr(mgmt->da))
2643 return RX_DROP_MONITOR;
2644
77a121c3
JB		 2645 /* process only for station */
2646 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2647 return RX_DROP_MONITOR;
2648 break;
2649 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2650 /* process only for ibss */
2651 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2652 return RX_DROP_MONITOR;
2653 break;
2654 default:
2655 return RX_DROP_MONITOR;
2656 }
f9d540ee 2657
77a121c3 2658 /* queue up frame and kick off work to process it */
c1475ca9 2659 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2660 skb_queue_tail(&sdata->skb_queue, rx->skb);
2661 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2662 if (rx->sta)
2663 rx->sta->rx_packets++;
46900298 2664
77a121c3 2665 return RX_QUEUED;
571ecf67
JB		 2666}
2667
5cf121c3 2668/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2669static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2670 struct ieee80211_rate *rate)
3d30d949
MW		 2671{
2672 struct ieee80211_sub_if_data *sdata;
2673 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2674 struct sk_buff *skb = rx->skb, *skb2;
2675 struct net_device *prev_dev = NULL;
eb9fb5b8 2676 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2677 int needed_headroom;
3d30d949 2678
554891e6
JB		 2679 /*
2680 * If cooked monitor has been processed already, then
2681 * don't do it again. If not, set the flag.
2682 */
2683 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2684 goto out_free_skb;
554891e6 2685 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2686
152c477a
JB		 2687 /* If there are no cooked monitor interfaces, just free the SKB */
2688 if (!local->cooked_mntrs)
2689 goto out_free_skb;
2690
293702a3 2691 /* room for the radiotap header based on driver features */
90b9e446 2692 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2693
293702a3
JB		 2694 if (skb_headroom(skb) < needed_headroom &&
2695 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2696 goto out_free_skb;
3d30d949 2697
293702a3 2698 /* prepend radiotap information */
973ef21a
FF		 2699 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2700 false);
3d30d949
MW		 2701
2702 skb_set_mac_header(skb, 0);
2703 skb->ip_summed = CHECKSUM_UNNECESSARY;
2704 skb->pkt_type = PACKET_OTHERHOST;
2705 skb->protocol = htons(ETH_P_802_2);
2706
2707 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2708 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2709 continue;
2710
05c914fe 2711 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2712 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2713 continue;
2714
2715 if (prev_dev) {
2716 skb2 = skb_clone(skb, GFP_ATOMIC);
2717 if (skb2) {
2718 skb2->dev = prev_dev;
5548a8a1 2719 netif_receive_skb(skb2);
3d30d949
MW		 2720 }
2721 }
2722
2723 prev_dev = sdata->dev;
2724 sdata->dev->stats.rx_packets++;
2725 sdata->dev->stats.rx_bytes += skb->len;
2726 }
2727
2728 if (prev_dev) {
2729 skb->dev = prev_dev;
5548a8a1 2730 netif_receive_skb(skb);
554891e6
JB		 2731 return;
2732 }
3d30d949
MW		 2733
2734 out_free_skb:
2735 dev_kfree_skb(skb);
2736}
2737
aa0c8636
CL		 2738static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2739 ieee80211_rx_result res)
2740{
2741 switch (res) {
2742 case RX_DROP_MONITOR:
2743 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2744 if (rx->sta)
2745 rx->sta->rx_dropped++;
2746 /* fall through */
2747 case RX_CONTINUE: {
2748 struct ieee80211_rate *rate = NULL;
2749 struct ieee80211_supported_band *sband;
2750 struct ieee80211_rx_status *status;
2751
2752 status = IEEE80211_SKB_RXCB((rx->skb));
2753
2754 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2755 if (!(status->flag & RX_FLAG_HT) &&
2756 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2757 rate = &sband->bitrates[status->rate_idx];
2758
2759 ieee80211_rx_cooked_monitor(rx, rate);
2760 break;
2761 }
2762 case RX_DROP_UNUSABLE:
2763 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2764 if (rx->sta)
2765 rx->sta->rx_dropped++;
2766 dev_kfree_skb(rx->skb);
2767 break;
2768 case RX_QUEUED:
2769 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2770 break;
2771 }
2772}
571ecf67 2773
24a8fdad 2774static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2775{
58905290 2776 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2777 struct sk_buff *skb;
8944b79f 2778
e32f85f7
LCC		 2779#define CALL_RXH(rxh) \
2780 do { \
2781 res = rxh(rx); \
2782 if (res != RX_CONTINUE) \
2569a826 2783 goto rxh_next; \
e32f85f7 2784 } while (0);
49461622 2785
24a8fdad
CL		 2786 spin_lock(&rx->local->rx_skb_queue.lock);
2787 if (rx->local->running_rx_handler)
2788 goto unlock;
2789
2790 rx->local->running_rx_handler = true;
2791
2792 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2793 spin_unlock(&rx->local->rx_skb_queue.lock);
2794
2569a826
JB		 2795 /*
2796 * all the other fields are valid across frames
2797 * that belong to an aMPDU since they are on the
2798 * same TID from the same station
2799 */
2800 rx->skb = skb;
2801
2802 CALL_RXH(ieee80211_rx_h_decrypt)
2803 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2804 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2805 CALL_RXH(ieee80211_rx_h_sta_process)
2806 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2807 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2808 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2809#ifdef CONFIG_MAC80211_MESH
aa0c8636 2810 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2811 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2812#endif
2154c81c 2813 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2814 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2815 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2816 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2817 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2818 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2819 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2820 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2821
aa0c8636
CL		 2822 rxh_next:
2823 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2824 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2825#undef CALL_RXH
aa0c8636 2826 }
24a8fdad
CL		 2827
2828 rx->local->running_rx_handler = false;
2829
2830 unlock:
2831 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2832}
2833
4406c376 2834static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2835{
aa0c8636
CL		 2836 ieee80211_rx_result res = RX_DROP_MONITOR;
2837
aa0c8636
CL		 2838#define CALL_RXH(rxh) \
2839 do { \
2840 res = rxh(rx); \
2841 if (res != RX_CONTINUE) \
2842 goto rxh_next; \
2843 } while (0);
2844
aa0c8636
CL		 2845 CALL_RXH(ieee80211_rx_h_check)
2846
24a8fdad 2847 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2848
24a8fdad 2849 ieee80211_rx_handlers(rx);
aa0c8636 2850 return;
49461622 2851
2569a826 2852 rxh_next:
aa0c8636
CL		 2853 ieee80211_rx_handlers_result(rx, res);
2854
2855#undef CALL_RXH
58905290
JB		 2856}
2857
2bff8ebf 2858/*
dd318575
JB		 2859 * This function makes calls into the RX path, therefore
2860 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2861 */
2862void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2863{
554891e6
JB		 2864 struct ieee80211_rx_data rx = {
2865 .sta = sta,
2866 .sdata = sta->sdata,
2867 .local = sta->local,
9e26297a
JB		 2868 /* This is OK -- must be QoS data frame */
2869 .security_idx = tid,
2870 .seqno_idx = tid,
fcf8bd3b 2871 .flags = 0,
554891e6 2872 };
2c15a0cf
CL		 2873 struct tid_ampdu_rx *tid_agg_rx;
2874
2875 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2876 if (!tid_agg_rx)
2877 return;
2bff8ebf 2878
2c15a0cf 2879 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2880 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2881 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2882
24a8fdad 2883 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2884}
2885
571ecf67
JB		 2886/* main receive path */
2887
20b01f80 2888static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2889 struct ieee80211_hdr *hdr)
2890{
20b01f80 2891 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2892 struct sk_buff *skb = rx->skb;
2893 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2894 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2895 int multicast = is_multicast_ether_addr(hdr->addr1);
2896
51fb61e7 2897 switch (sdata->vif.type) {
05c914fe 2898 case NL80211_IFTYPE_STATION:
9bc383de 2899 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2900 return 0;
77fdaa12 2901 if (!multicast &&
b203ca39 2902 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2903 if (!(sdata->dev->flags & IFF_PROMISC) ||
2904 sdata->u.mgd.use_4addr)
23a24def 2905 return 0;
554891e6 2906 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2907 }
2908 break;
05c914fe 2909 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2910 if (!bssid)
2911 return 0;
a7767f95 2912 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2913 return 1;
d48b2968
JB		 2914 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2915 return 0;
23a24def 2916 } else if (!multicast &&
b203ca39 2917 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2918 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2919 return 0;
554891e6 2920 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2921 } else if (!rx->sta) {
2922 int rate_idx;
5614618e
JB		 2923 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
2924 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 2925 else
eb9fb5b8 2926 rate_idx = status->rate_idx;
8bf11d8d
JB		 2927 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2928 BIT(rate_idx));
0fb8ca45 2929 }
23a24def 2930 break;
05c914fe 2931 case NL80211_IFTYPE_MESH_POINT:
6032f934 2932 if (!multicast &&
b203ca39 2933 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2934 if (!(sdata->dev->flags & IFF_PROMISC))
2935 return 0;
2936
554891e6 2937 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2938 }
2939 break;
05c914fe
JB		 2940 case NL80211_IFTYPE_AP_VLAN:
2941 case NL80211_IFTYPE_AP:
23a24def 2942 if (!bssid) {
b203ca39 2943 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2944 return 0;
f142c6b9 2945 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2946 /*
2947 * Accept public action frames even when the
2948 * BSSID doesn't match, this is used for P2P
2949 * and location updates. Note that mac80211
2950 * itself never looks at these frames.
2951 */
d48b2968 2952 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2953 return 1;
d48b2968 2954 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2955 return 0;
554891e6 2956 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2957 }
23a24def 2958 break;
05c914fe 2959 case NL80211_IFTYPE_WDS:
a7767f95 2960 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2961 return 0;
b203ca39 2962 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2963 return 0;
2964 break;
f142c6b9
JB		 2965 case NL80211_IFTYPE_P2P_DEVICE:
2966 if (!ieee80211_is_public_action(hdr, skb->len) &&
2967 !ieee80211_is_probe_req(hdr->frame_control) &&
2968 !ieee80211_is_probe_resp(hdr->frame_control) &&
2969 !ieee80211_is_beacon(hdr->frame_control))
2970 return 0;
2971 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2972 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2973 break;
2ca27bcf 2974 default:
fb1c1cd6 2975 /* should never get here */
f142c6b9 2976 WARN_ON_ONCE(1);
fb1c1cd6 2977 break;
23a24def
JB		 2978 }
2979
2980 return 1;
2981}
2982
4406c376
JB		 2983/*
2984 * This function returns whether or not the SKB
2985 * was destined for RX processing or not, which,
2986 * if consume is true, is equivalent to whether
2987 * or not the skb was consumed.
2988 */
2989static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2990 struct sk_buff *skb, bool consume)
2991{
2992 struct ieee80211_local *local = rx->local;
2993 struct ieee80211_sub_if_data *sdata = rx->sdata;
2994 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2995 struct ieee80211_hdr *hdr = (void *)skb->data;
2996 int prepares;
2997
2998 rx->skb = skb;
554891e6 2999 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 3000 prepares = prepare_for_handlers(rx, hdr);
3001
3002 if (!prepares)
3003 return false;
3004
4406c376
JB		 3005 if (!consume) {
3006 skb = skb_copy(skb, GFP_ATOMIC);
3007 if (!skb) {
3008 if (net_ratelimit())
3009 wiphy_debug(local->hw.wiphy,
b305dae4 3010 "failed to copy skb for %s\n",
4406c376
JB		 3011 sdata->name);
3012 return true;
3013 }
3014
3015 rx->skb = skb;
3016 }
3017
3018 ieee80211_invoke_rx_handlers(rx);
3019 return true;
3020}
3021
571ecf67 3022/*
6368e4b1
RR		 3023 * This is the actual Rx frames handler. as it blongs to Rx path it must
3024 * be called with rcu_read_lock protection.
571ecf67 3025 */
71ebb4aa 3026static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3027 struct sk_buff *skb)
571ecf67
JB		 3028{
3029 struct ieee80211_local *local = hw_to_local(hw);
3030 struct ieee80211_sub_if_data *sdata;
571ecf67 3031 struct ieee80211_hdr *hdr;
e3cf8b3f 3032 __le16 fc;
5cf121c3 3033 struct ieee80211_rx_data rx;
4406c376 3034 struct ieee80211_sub_if_data *prev;
56af3268 3035 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3036 int err = 0;
571ecf67 3037
e3cf8b3f 3038 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3039 memset(&rx, 0, sizeof(rx));
3040 rx.skb = skb;
3041 rx.local = local;
72abd81b 3042
e3cf8b3f 3043 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3044 local->dot11ReceivedFragmentCount++;
571ecf67 3045
4a4f1a58
JB		 3046 if (ieee80211_is_mgmt(fc)) {
3047 /* drop frame if too short for header */
3048 if (skb->len < ieee80211_hdrlen(fc))
3049 err = -ENOBUFS;
3050 else
3051 err = skb_linearize(skb);
3052 } else {
e3cf8b3f 3053 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3054 }
e3cf8b3f
ZY		 3055
3056 if (err) {
3057 dev_kfree_skb(skb);
3058 return;
3059 }
3060
3061 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3062 ieee80211_parse_qos(&rx);
d1c3a37c 3063 ieee80211_verify_alignment(&rx);
38f3714d 3064
d48b2968
JB		 3065 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3066 ieee80211_is_beacon(hdr->frame_control)))
3067 ieee80211_scan_rx(local, skb);
3068
e3cf8b3f 3069 if (ieee80211_is_data(fc)) {
56af3268 3070 prev_sta = NULL;
4406c376 3071
7852e361 3072 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3073 if (!prev_sta) {
3074 prev_sta = sta;
3075 continue;
3076 }
3077
3078 rx.sta = prev_sta;
3079 rx.sdata = prev_sta->sdata;
4406c376 3080 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3081
56af3268 3082 prev_sta = sta;
4406c376 3083 }
56af3268
BG		 3084
3085 if (prev_sta) {
3086 rx.sta = prev_sta;
3087 rx.sdata = prev_sta->sdata;
3088
4406c376 3089 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3090 return;
8e26d5ad 3091 goto out;
56af3268 3092 }
4406c376
JB		 3093 }
3094
4b0dd98e 3095 prev = NULL;
b2e7771e 3096
4b0dd98e
JB		 3097 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3098 if (!ieee80211_sdata_running(sdata))
3099 continue;
340e11f3 3100
4b0dd98e
JB		 3101 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3102 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3103 continue;
340e11f3 3104
4b0dd98e
JB		 3105 /*
3106 * frame is destined for this interface, but if it's
3107 * not also for the previous one we handle that after
3108 * the loop to avoid copying the SKB once too much
3109 */
4bb29f8c 3110
4b0dd98e 3111 if (!prev) {
abe60632 3112 prev = sdata;
4b0dd98e 3113 continue;
340e11f3 3114 }
4bb29f8c 3115
7852e361 3116 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3117 rx.sdata = prev;
3118 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3119
4b0dd98e
JB		 3120 prev = sdata;
3121 }
3122
3123 if (prev) {
7852e361 3124 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3125 rx.sdata = prev;
4406c376 3126
4b0dd98e
JB		 3127 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3128 return;
571ecf67 3129 }
4406c376 3130
8e26d5ad 3131 out:
4406c376 3132 dev_kfree_skb(skb);
571ecf67 3133}
6368e4b1
RR		 3134
3135/*
3136 * This is the receive path handler. It is called by a low level driver when an
3137 * 802.11 MPDU is received from the hardware.
3138 */
103bf9f7 3139void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3140{
3141 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3142 struct ieee80211_rate *rate = NULL;
3143 struct ieee80211_supported_band *sband;
f1d58c25 3144 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3145
d20ef63d
JB		 3146 WARN_ON_ONCE(softirq_count() == 0);
3147
444e3803 3148 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3149 goto drop;
8318d78a
JB		 3150
3151 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3152 if (WARN_ON(!sband))
3153 goto drop;
8318d78a 3154
89c3a8ac
JB		 3155 /*
3156 * If we're suspending, it is possible although not too likely
3157 * that we'd be receiving frames after having already partially
3158 * quiesced the stack. We can't process such frames then since
3159 * that might, for example, cause stations to be added or other
3160 * driver callbacks be invoked.
3161 */
77a980dc
JB		 3162 if (unlikely(local->quiescing || local->suspended))
3163 goto drop;
89c3a8ac 3164
04800ada
AN		 3165 /* We might be during a HW reconfig, prevent Rx for the same reason */
3166 if (unlikely(local->in_reconfig))
3167 goto drop;
3168
ea77f12f
JB		 3169 /*
3170 * The same happens when we're not even started,
3171 * but that's worth a warning.
3172 */
77a980dc
JB		 3173 if (WARN_ON(!local->started))
3174 goto drop;
ea77f12f 3175
fc885189 3176 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3177 /*
fc885189
JB		 3178 * Validate the rate, unless a PLCP error means that
3179 * we probably can't have a valid rate here anyway.
e5d6eb83 3180 */
fc885189
JB		 3181
3182 if (status->flag & RX_FLAG_HT) {
3183 /*
3184 * rate_idx is MCS index, which can be [0-76]
3185 * as documented on:
3186 *
3187 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3188 *
3189 * Anything else would be some sort of driver or
3190 * hardware error. The driver should catch hardware
3191 * errors.
3192 */
444e3803 3193 if (WARN(status->rate_idx > 76,
fc885189
JB		 3194 "Rate marked as an HT rate but passed "
3195 "status->rate_idx is not "
3196 "an MCS index [0-76]: %d (0x%02x)\n",
3197 status->rate_idx,
3198 status->rate_idx))
3199 goto drop;
5614618e
JB		 3200 } else if (status->flag & RX_FLAG_VHT) {
3201 if (WARN_ONCE(status->rate_idx > 9 ||
3202 !status->vht_nss ||
3203 status->vht_nss > 8,
3204 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3205 status->rate_idx, status->vht_nss))
3206 goto drop;
fc885189 3207 } else {
444e3803 3208 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3209 goto drop;
3210 rate = &sband->bitrates[status->rate_idx];
3211 }
0fb8ca45 3212 }
6368e4b1 3213
554891e6
JB		 3214 status->rx_flags = 0;
3215
6368e4b1
RR		 3216 /*
3217 * key references and virtual interfaces are protected using RCU
3218 * and this requires that we are in a read-side RCU section during
3219 * receive processing
3220 */
3221 rcu_read_lock();
3222
3223 /*
3224 * Frames with failed FCS/PLCP checksum are not returned,
3225 * all other frames are returned without radiotap header
3226 * if it was previously present.
3227 * Also, frames with less than 16 bytes are dropped.
3228 */
f1d58c25 3229 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3230 if (!skb) {
3231 rcu_read_unlock();
3232 return;
3233 }
3234
e1e54068
JB		 3235 ieee80211_tpt_led_trig_rx(local,
3236 ((struct ieee80211_hdr *)skb->data)->frame_control,
3237 skb->len);
071d9ac2 3238 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3239
3240 rcu_read_unlock();
77a980dc
JB		 3241
3242 return;
3243 drop:
3244 kfree_skb(skb);
6368e4b1 3245}
103bf9f7 3246EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3247
3248/* This is a version of the rx handler that can be called from hard irq
3249 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3250void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3251{
3252 struct ieee80211_local *local = hw_to_local(hw);
3253
3254 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3255
571ecf67
JB		 3256 skb->pkt_type = IEEE80211_RX_MSG;
3257 skb_queue_tail(&local->skb_queue, skb);
3258 tasklet_schedule(&local->tasklet);
3259}
3260EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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