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mac80211: Add the DS Params for mesh to every band
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
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 380
b2e7771e
JB		 381 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
382 present_fcs_len = FCS_LEN;
383
605f1a5b
JB		 384 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
385 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
e3cf8b3f
ZY		 386 dev_kfree_skb(origskb);
387 return NULL;
388 }
389
b2e7771e 390 if (!local->monitors) {
0869aea0 391 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 392 dev_kfree_skb(origskb);
393 return NULL;
394 }
395
0869aea0 396 return remove_monitor_info(local, origskb);
b2e7771e
JB		 397 }
398
751413ea
HS		 399 /* room for the radiotap header based on driver features */
400 needed_headroom = ieee80211_rx_radiotap_space(local, status);
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
3f52b7e3
MP		 1455 /* mesh power save support */
1456 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1457 ieee80211_mps_rx_h_sta_process(sta, hdr);
1458
22403def
JB		 1459 /*
1460 * Drop (qos-)data::nullfunc frames silently, since they
1461 * are used only to control station power saving mode.
1462 */
1463 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1464 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1465 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1466
1467 /*
1468 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1469 * that was not moved to a 4-addr STA vlan yet send
1470 * the event to userspace and for older hostapd drop
1471 * the frame to the monitor interface.
d524215f
FF		 1472 */
1473 if (ieee80211_has_a4(hdr->frame_control) &&
1474 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1475 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1476 !rx->sdata->u.vlan.sta))) {
1477 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1478 cfg80211_rx_unexpected_4addr_frame(
1479 rx->sdata->dev, sta->sta.addr,
1480 GFP_ATOMIC);
d524215f 1481 return RX_DROP_MONITOR;
e7f4a940 1482 }
22403def
JB		 1483 /*
1484 * Update counter and free packet here to avoid
1485 * counting this as a dropped packed.
1486 */
571ecf67
JB		 1487 sta->rx_packets++;
1488 dev_kfree_skb(rx->skb);
9ae54c84 1489 return RX_QUEUED;
571ecf67
JB		 1490 }
1491
9ae54c84 1492 return RX_CONTINUE;
571ecf67
JB		 1493} /* ieee80211_rx_h_sta_process */
1494
571ecf67
JB		 1495static inline struct ieee80211_fragment_entry *
1496ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1497 unsigned int frag, unsigned int seq, int rx_queue,
1498 struct sk_buff **skb)
1499{
1500 struct ieee80211_fragment_entry *entry;
571ecf67 1501
571ecf67
JB		 1502 entry = &sdata->fragments[sdata->fragment_next++];
1503 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1504 sdata->fragment_next = 0;
1505
bdcbd8e0 1506 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1507 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1508
1509 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1510 *skb = NULL;
1511 entry->first_frag_time = jiffies;
1512 entry->seq = seq;
1513 entry->rx_queue = rx_queue;
1514 entry->last_frag = frag;
1515 entry->ccmp = 0;
1516 entry->extra_len = 0;
1517
1518 return entry;
1519}
1520
1521static inline struct ieee80211_fragment_entry *
1522ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1523 unsigned int frag, unsigned int seq,
571ecf67
JB		 1524 int rx_queue, struct ieee80211_hdr *hdr)
1525{
1526 struct ieee80211_fragment_entry *entry;
1527 int i, idx;
1528
1529 idx = sdata->fragment_next;
1530 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1531 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1532
1533 idx--;
1534 if (idx < 0)
1535 idx = IEEE80211_FRAGMENT_MAX - 1;
1536
1537 entry = &sdata->fragments[idx];
1538 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1539 entry->rx_queue != rx_queue ||
1540 entry->last_frag + 1 != frag)
1541 continue;
1542
b73d70ad 1543 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1544
b73d70ad
HH		 1545 /*
1546 * Check ftype and addresses are equal, else check next fragment
1547 */
1548 if (((hdr->frame_control ^ f_hdr->frame_control) &
1549 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1550 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1551 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1552 continue;
1553
ab46623e 1554 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1555 __skb_queue_purge(&entry->skb_list);
1556 continue;
1557 }
1558 return entry;
1559 }
1560
1561 return NULL;
1562}
1563
49461622 1564static ieee80211_rx_result debug_noinline
5cf121c3 1565ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1566{
1567 struct ieee80211_hdr *hdr;
1568 u16 sc;
358c8d9d 1569 __le16 fc;
571ecf67
JB		 1570 unsigned int frag, seq;
1571 struct ieee80211_fragment_entry *entry;
1572 struct sk_buff *skb;
554891e6 1573 struct ieee80211_rx_status *status;
571ecf67 1574
b73d70ad 1575 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1576 fc = hdr->frame_control;
f7fbf70e
JC		 1577
1578 if (ieee80211_is_ctl(fc))
1579 return RX_CONTINUE;
1580
571ecf67
JB		 1581 sc = le16_to_cpu(hdr->seq_ctrl);
1582 frag = sc & IEEE80211_SCTL_FRAG;
1583
358c8d9d 1584 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1585 is_multicast_ether_addr(hdr->addr1))) {
1586 /* not fragmented */
1587 goto out;
1588 }
1589 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1590
e3cf8b3f
ZY		 1591 if (skb_linearize(rx->skb))
1592 return RX_DROP_UNUSABLE;
1593
058897a4
AK		 1594 /*
1595 * skb_linearize() might change the skb->data and
1596 * previously cached variables (in this case, hdr) need to
1597 * be refreshed with the new data.
1598 */
1599 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1600 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1601
1602 if (frag == 0) {
1603 /* This is the first fragment of a new frame. */
1604 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1605 rx->seqno_idx, &(rx->skb));
97359d12 1606 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1607 ieee80211_has_protected(fc)) {
9e26297a 1608 int queue = rx->security_idx;
571ecf67
JB		 1609 /* Store CCMP PN so that we can verify that the next
1610 * fragment has a sequential PN value. */
1611 entry->ccmp = 1;
1612 memcpy(entry->last_pn,
9190252c 1613 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1614 CCMP_PN_LEN);
1615 }
9ae54c84 1616 return RX_QUEUED;
571ecf67
JB		 1617 }
1618
1619 /* This is a fragment for a frame that should already be pending in
1620 * fragment cache. Add this fragment to the end of the pending entry.
1621 */
9e26297a
JB		 1622 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1623 rx->seqno_idx, hdr);
571ecf67
JB		 1624 if (!entry) {
1625 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1626 return RX_DROP_MONITOR;
571ecf67
JB		 1627 }
1628
1629 /* Verify that MPDUs within one MSDU have sequential PN values.
1630 * (IEEE 802.11i, 8.3.3.4.5) */
1631 if (entry->ccmp) {
1632 int i;
1633 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1634 int queue;
97359d12 1635 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1636 return RX_DROP_UNUSABLE;
571ecf67
JB		 1637 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1638 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1639 pn[i]++;
1640 if (pn[i])
1641 break;
1642 }
9e26297a 1643 queue = rx->security_idx;
9190252c 1644 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1645 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1646 return RX_DROP_UNUSABLE;
571ecf67
JB		 1647 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1648 }
1649
358c8d9d 1650 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1651 __skb_queue_tail(&entry->skb_list, rx->skb);
1652 entry->last_frag = frag;
1653 entry->extra_len += rx->skb->len;
358c8d9d 1654 if (ieee80211_has_morefrags(fc)) {
571ecf67 1655 rx->skb = NULL;
9ae54c84 1656 return RX_QUEUED;
571ecf67
JB		 1657 }
1658
1659 rx->skb = __skb_dequeue(&entry->skb_list);
1660 if (skb_tailroom(rx->skb) < entry->extra_len) {
1661 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1662 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1663 GFP_ATOMIC))) {
1664 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1665 __skb_queue_purge(&entry->skb_list);
e4c26add 1666 return RX_DROP_UNUSABLE;
571ecf67
JB		 1667 }
1668 }
1669 while ((skb = __skb_dequeue(&entry->skb_list))) {
1670 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1671 dev_kfree_skb(skb);
1672 }
1673
1674 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1675 status = IEEE80211_SKB_RXCB(rx->skb);
1676 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1677
1678 out:
1679 if (rx->sta)
1680 rx->sta->rx_packets++;
1681 if (is_multicast_ether_addr(hdr->addr1))
1682 rx->local->dot11MulticastReceivedFrameCount++;
1683 else
1684 ieee80211_led_rx(rx->local);
9ae54c84 1685 return RX_CONTINUE;
571ecf67
JB		 1686}
1687
1df332e8 1688static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1689{
1df332e8 1690 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1691 return -EACCES;
571ecf67 1692
76ee65bf 1693 return 0;
571ecf67
JB		 1694}
1695
1df332e8 1696static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1697{
eb9fb5b8
JB		 1698 struct sk_buff *skb = rx->skb;
1699 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1700
3017b80b 1701 /*
7848ba7d
JB		 1702 * Pass through unencrypted frames if the hardware has
1703 * decrypted them already.
3017b80b 1704 */
eb9fb5b8 1705 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1706 return 0;
571ecf67
JB		 1707
1708 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1709 if (unlikely(!ieee80211_has_protected(fc) &&
1710 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1711 ieee80211_is_data(fc) &&
b3fc9c6c 1712 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1713 return -EACCES;
bef5d1c7
JB		 1714
1715 return 0;
1716}
1717
1df332e8 1718static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1719{
1720 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1721 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1722 __le16 fc = hdr->frame_control;
bef5d1c7 1723
e3efca0a
JM		 1724 /*
1725 * Pass through unencrypted frames if the hardware has
1726 * decrypted them already.
1727 */
1728 if (status->flag & RX_FLAG_DECRYPTED)
1729 return 0;
bef5d1c7 1730
c2c98fde 1731 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1732 if (unlikely(!ieee80211_has_protected(fc) &&
1733 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1734 rx->key)) {
1735 if (ieee80211_is_deauth(fc))
1736 cfg80211_send_unprot_deauth(rx->sdata->dev,
1737 rx->skb->data,
1738 rx->skb->len);
1739 else if (ieee80211_is_disassoc(fc))
1740 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1741 rx->skb->data,
1742 rx->skb->len);
f2ca3ea4 1743 return -EACCES;
cf4e594e 1744 }
f2ca3ea4 1745 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1746 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1747 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1748 if (ieee80211_is_deauth(fc))
1749 cfg80211_send_unprot_deauth(rx->sdata->dev,
1750 rx->skb->data,
1751 rx->skb->len);
1752 else if (ieee80211_is_disassoc(fc))
1753 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1754 rx->skb->data,
1755 rx->skb->len);
f2ca3ea4 1756 return -EACCES;
cf4e594e 1757 }
f2ca3ea4
JM		 1758 /*
1759 * When using MFP, Action frames are not allowed prior to
1760 * having configured keys.
1761 */
1762 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1763 ieee80211_is_robust_mgmt_frame(
1764 (struct ieee80211_hdr *) rx->skb->data)))
1765 return -EACCES;
1766 }
b3fc9c6c 1767
76ee65bf 1768 return 0;
571ecf67
JB		 1769}
1770
76ee65bf 1771static int
4114fa21 1772__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1773{
eb9fb5b8 1774 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1775 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1776 bool check_port_control = false;
1777 struct ethhdr *ehdr;
1778 int ret;
f14543ee 1779
4114fa21 1780 *port_control = false;
9bc383de
JB		 1781 if (ieee80211_has_a4(hdr->frame_control) &&
1782 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1783 return -1;
9bc383de 1784
fbb327c5
FF		 1785 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1786 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1787
1788 if (!sdata->u.mgd.use_4addr)
1789 return -1;
1790 else
1791 check_port_control = true;
1792 }
1793
9bc383de 1794 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1795 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1796 return -1;
571ecf67 1797
fbb327c5 1798 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1799 if (ret < 0)
fbb327c5
FF		 1800 return ret;
1801
1802 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1803 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1804 *port_control = true;
1805 else if (check_port_control)
fbb327c5
FF		 1806 return -1;
1807
1808 return 0;
76ee65bf 1809}
571ecf67 1810
ce3edf6d
JB		 1811/*
1812 * requires that rx->skb is a frame with ethernet header
1813 */
358c8d9d 1814static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1815{
c97c23e3 1816 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1817 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1818 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1819
1820 /*
1821 * Allow EAPOL frames to us/the PAE group address regardless
1822 * of whether the frame was encrypted or not.
1823 */
a621fa4d 1824 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1825 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1826 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1827 return true;
1828
1829 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1830 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1831 return false;
1832
1833 return true;
1834}
1835
1836/*
1837 * requires that rx->skb is a frame with ethernet header
1838 */
76ee65bf 1839static void
5cf121c3 1840ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1841{
eb9fb5b8
JB		 1842 struct ieee80211_sub_if_data *sdata = rx->sdata;
1843 struct net_device *dev = sdata->dev;
76ee65bf 1844 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1845 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1846 struct sta_info *dsta;
554891e6 1847 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1848
76ee65bf
RR		 1849 skb = rx->skb;
1850 xmit_skb = NULL;
571ecf67 1851
05c914fe
JB		 1852 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1853 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1854 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1855 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1856 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1857 if (is_multicast_ether_addr(ehdr->h_dest)) {
1858 /*
1859 * send multicast frames both to higher layers in
1860 * local net stack and back to the wireless medium
1861 */
76ee65bf 1862 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1863 if (!xmit_skb)
bdcbd8e0 1864 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1865 dev->name);
571ecf67 1866 } else {
abe60632
JB		 1867 dsta = sta_info_get(sdata, skb->data);
1868 if (dsta) {
ce3edf6d
JB		 1869 /*
1870 * The destination station is associated to
1871 * this AP (in this VLAN), so send the frame
1872 * directly to it and do not pass it to local
1873 * net stack.
571ecf67 1874 */
76ee65bf 1875 xmit_skb = skb;
571ecf67
JB		 1876 skb = NULL;
1877 }
571ecf67
JB		 1878 }
1879 }
1880
1881 if (skb) {
d1c3a37c
JB		 1882 int align __maybe_unused;
1883
59d9cb07 1884#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1885 /*
1886 * 'align' will only take the values 0 or 2 here
1887 * since all frames are required to be aligned
1888 * to 2-byte boundaries when being passed to
1889 * mac80211. That also explains the __skb_push()
1890 * below.
1891 */
dacb6f1d 1892 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1893 if (align) {
1894 if (WARN_ON(skb_headroom(skb) < 3)) {
1895 dev_kfree_skb(skb);
1896 skb = NULL;
1897 } else {
1898 u8 *data = skb->data;
8ce0b589
ZY		 1899 size_t len = skb_headlen(skb);
1900 skb->data -= align;
1901 memmove(skb->data, data, len);
1902 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1903 }
1904 }
1905#endif
1906
1907 if (skb) {
1908 /* deliver to local stack */
1909 skb->protocol = eth_type_trans(skb, dev);
1910 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1911 netif_receive_skb(skb);
d1c3a37c 1912 }
571ecf67
JB		 1913 }
1914
76ee65bf 1915 if (xmit_skb) {
aef6c928
HS		 1916 /*
1917 * Send to wireless media and increase priority by 256 to
1918 * keep the received priority instead of reclassifying
1919 * the frame (see cfg80211_classify8021d).
1920 */
1921 xmit_skb->priority += 256;
f831e909 1922 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1923 skb_reset_network_header(xmit_skb);
1924 skb_reset_mac_header(xmit_skb);
76ee65bf 1925 dev_queue_xmit(xmit_skb);
571ecf67 1926 }
76ee65bf
RR		 1927}
1928
49461622 1929static ieee80211_rx_result debug_noinline
5cf121c3 1930ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1931{
eb9fb5b8 1932 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1933 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1934 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1935 __le16 fc = hdr->frame_control;
eaf85ca7 1936 struct sk_buff_head frame_list;
554891e6 1937 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1938
358c8d9d 1939 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1940 return RX_CONTINUE;
fd4c7f2f 1941
358c8d9d 1942 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1943 return RX_DROP_MONITOR;
fd4c7f2f 1944
554891e6 1945 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1946 return RX_CONTINUE;
fd4c7f2f 1947
eaf85ca7
ZY		 1948 if (ieee80211_has_a4(hdr->frame_control) &&
1949 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1950 !rx->sdata->u.vlan.sta)
e4c26add 1951 return RX_DROP_UNUSABLE;
fd4c7f2f 1952
eaf85ca7
ZY		 1953 if (is_multicast_ether_addr(hdr->addr1) &&
1954 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1955 rx->sdata->u.vlan.sta) ||
1956 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1957 rx->sdata->u.mgd.use_4addr)))
e4c26add 1958 return RX_DROP_UNUSABLE;
fd4c7f2f 1959
eaf85ca7
ZY		 1960 skb->dev = dev;
1961 __skb_queue_head_init(&frame_list);
fd4c7f2f 1962
e3cf8b3f
ZY		 1963 if (skb_linearize(skb))
1964 return RX_DROP_UNUSABLE;
1965
eaf85ca7
ZY		 1966 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1967 rx->sdata->vif.type,
8b3becad 1968 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1969
eaf85ca7
ZY		 1970 while (!skb_queue_empty(&frame_list)) {
1971 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1972
358c8d9d 1973 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1974 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1975 continue;
1976 }
eaf85ca7
ZY		 1977 dev->stats.rx_packets++;
1978 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1979
1980 ieee80211_deliver_skb(rx);
1981 }
1982
9ae54c84 1983 return RX_QUEUED;
fd4c7f2f
RR		 1984}
1985
bf94e17b 1986#ifdef CONFIG_MAC80211_MESH
b0dee578 1987static ieee80211_rx_result
e32f85f7
LCC		 1988ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1989{
30789eb6
TP		 1990 struct ieee80211_hdr *fwd_hdr, *hdr;
1991 struct ieee80211_tx_info *info;
e32f85f7 1992 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1993 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1994 struct ieee80211_local *local = rx->local;
eb9fb5b8 1995 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1996 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1997 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1998 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1999 u16 q, hdrlen;
e32f85f7
LCC		 2000
2001 hdr = (struct ieee80211_hdr *) skb->data;
2002 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2003
2004 /* make sure fixed part of mesh header is there, also checks skb len */
2005 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2006 return RX_DROP_MONITOR;
2007
2008 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2009
2010 /* make sure full mesh header is there, also checks skb len */
2011 if (!pskb_may_pull(rx->skb,
2012 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2013 return RX_DROP_MONITOR;
2014
2015 /* reload pointers */
2016 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2017 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2018
2157fdd6
TP		 2019 /* frame is in RMC, don't forward */
2020 if (ieee80211_is_data(hdr->frame_control) &&
2021 is_multicast_ether_addr(hdr->addr1) &&
2022 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
2023 return RX_DROP_MONITOR;
2024
555cb715
JC		 2025 if (!ieee80211_is_data(hdr->frame_control) ||
2026 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2027 return RX_CONTINUE;
2028
2029 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2030 return RX_DROP_MONITOR;
2031
43b7b314 2032 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2033 struct mesh_path *mppath;
43b7b314
JC		 2034 char *proxied_addr;
2035 char *mpp_addr;
2036
2037 if (is_multicast_ether_addr(hdr->addr1)) {
2038 mpp_addr = hdr->addr3;
2039 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2040 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2041 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2042 mpp_addr = hdr->addr4;
2043 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2044 } else {
2045 return RX_DROP_MONITOR;
43b7b314 2046 }
79617dee 2047
79617dee 2048 rcu_read_lock();
43b7b314 2049 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 2050 if (!mppath) {
43b7b314 2051 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 2052 } else {
2053 spin_lock_bh(&mppath->state_lock);
b203ca39 2054 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2055 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2056 spin_unlock_bh(&mppath->state_lock);
2057 }
2058 rcu_read_unlock();
2059 }
2060
3c5772a5
JC		 2061 /* Frame has reached destination. Don't forward */
2062 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2063 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2064 return RX_CONTINUE;
2065
00e96dec 2066 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2067 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2068 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2069 return RX_DROP_MONITOR;
2070 }
2071 skb_set_queue_mapping(skb, q);
e32f85f7 2072
30789eb6
TP		 2073 if (!--mesh_hdr->ttl) {
2074 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2075 goto out;
30789eb6
TP		 2076 }
2077
d665508b
CYY		 2078 if (!ifmsh->mshcfg.dot11MeshForwarding)
2079 goto out;
2080
30789eb6
TP		 2081 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2082 if (!fwd_skb) {
bdcbd8e0 2083 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2084 sdata->name);
30789eb6
TP		 2085 goto out;
2086 }
2087
2088 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2089 info = IEEE80211_SKB_CB(fwd_skb);
2090 memset(info, 0, sizeof(*info));
2091 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2092 info->control.vif = &rx->sdata->vif;
2093 info->control.jiffies = jiffies;
2094 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2095 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2096 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2097 /* update power mode indication when forwarding */
2098 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
30789eb6 2099 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
3f52b7e3 2100 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2101 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2102 } else {
2103 /* unable to resolve next hop */
2104 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1df332e8 2105 0, reason, fwd_hdr->addr2, sdata);
30789eb6 2106 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2107 kfree_skb(fwd_skb);
30789eb6 2108 return RX_DROP_MONITOR;
e32f85f7
LCC		 2109 }
2110
30789eb6
TP		 2111 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2112 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2113 out:
3c5772a5 2114 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2115 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2116 return RX_CONTINUE;
2117 else
2118 return RX_DROP_MONITOR;
2119}
bf94e17b 2120#endif
e32f85f7 2121
49461622 2122static ieee80211_rx_result debug_noinline
5cf121c3 2123ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2124{
eb9fb5b8 2125 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2126 struct ieee80211_local *local = rx->local;
eb9fb5b8 2127 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2128 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2129 __le16 fc = hdr->frame_control;
4114fa21 2130 bool port_control;
ce3edf6d 2131 int err;
76ee65bf 2132
358c8d9d 2133 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2134 return RX_CONTINUE;
76ee65bf 2135
358c8d9d 2136 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2137 return RX_DROP_MONITOR;
76ee65bf 2138
f14543ee 2139 /*
e7f4a940
JB		 2140 * Send unexpected-4addr-frame event to hostapd. For older versions,
2141 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2142 */
2143 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2144 sdata->vif.type == NL80211_IFTYPE_AP) {
2145 if (rx->sta &&
2146 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2147 cfg80211_rx_unexpected_4addr_frame(
2148 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2149 return RX_DROP_MONITOR;
e7f4a940 2150 }
f14543ee 2151
4114fa21 2152 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2153 if (unlikely(err))
e4c26add 2154 return RX_DROP_UNUSABLE;
76ee65bf 2155
358c8d9d 2156 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2157 return RX_DROP_MONITOR;
ce3edf6d 2158
4114fa21
FF		 2159 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2160 unlikely(port_control) && sdata->bss) {
2161 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2162 u.ap);
2163 dev = sdata->dev;
2164 rx->sdata = sdata;
2165 }
2166
76ee65bf
RR		 2167 rx->skb->dev = dev;
2168
2169 dev->stats.rx_packets++;
2170 dev->stats.rx_bytes += rx->skb->len;
2171
08ca944e 2172 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2173 !is_multicast_ether_addr(
2174 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2175 (!local->scanning &&
2176 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2177 mod_timer(&local->dynamic_ps_timer, jiffies +
2178 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2179 }
2180
76ee65bf 2181 ieee80211_deliver_skb(rx);
571ecf67 2182
9ae54c84 2183 return RX_QUEUED;
571ecf67
JB		 2184}
2185
49461622 2186static ieee80211_rx_result debug_noinline
24a8fdad 2187ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2188{
71364716 2189 struct sk_buff *skb = rx->skb;
a7767f95 2190 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2191 struct tid_ampdu_rx *tid_agg_rx;
2192 u16 start_seq_num;
2193 u16 tid;
2194
a7767f95 2195 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2196 return RX_CONTINUE;
71364716 2197
a7767f95 2198 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2199 struct {
2200 __le16 control, start_seq_num;
2201 } __packed bar_data;
2202
71364716 2203 if (!rx->sta)
a02ae758 2204 return RX_DROP_MONITOR;
8ae5977f
JB		 2205
2206 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2207 &bar_data, sizeof(bar_data)))
2208 return RX_DROP_MONITOR;
2209
8ae5977f 2210 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2211
2212 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2213 if (!tid_agg_rx)
a02ae758 2214 return RX_DROP_MONITOR;
71364716 2215
8ae5977f 2216 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2217
2218 /* reset session timer */
20ad19d0
JB		 2219 if (tid_agg_rx->timeout)
2220 mod_timer(&tid_agg_rx->session_timer,
2221 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2222
dd318575 2223 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2224 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2225 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2226 start_seq_num);
dd318575
JB		 2227 spin_unlock(&tid_agg_rx->reorder_lock);
2228
a02ae758
JB		 2229 kfree_skb(skb);
2230 return RX_QUEUED;
71364716
RR		 2231 }
2232
08daecae
JB		 2233 /*
2234 * After this point, we only want management frames,
2235 * so we can drop all remaining control frames to
2236 * cooked monitor interfaces.
2237 */
2238 return RX_DROP_MONITOR;
71364716
RR		 2239}
2240
f4f727a6
JM		 2241static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2242 struct ieee80211_mgmt *mgmt,
2243 size_t len)
fea14732
JM		 2244{
2245 struct ieee80211_local *local = sdata->local;
2246 struct sk_buff *skb;
2247 struct ieee80211_mgmt *resp;
2248
b203ca39 2249 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2250 /* Not to own unicast address */
2251 return;
2252 }
2253
b203ca39
JP		 2254 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2255 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2256 /* Not from the current AP or not associated yet. */
fea14732
JM		 2257 return;
2258 }
2259
2260 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2261 /* Too short SA Query request frame */
2262 return;
2263 }
2264
2265 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2266 if (skb == NULL)
2267 return;
2268
2269 skb_reserve(skb, local->hw.extra_tx_headroom);
2270 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2271 memset(resp, 0, 24);
2272 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2273 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2274 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2275 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2276 IEEE80211_STYPE_ACTION);
2277 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2278 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2279 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2280 memcpy(resp->u.action.u.sa_query.trans_id,
2281 mgmt->u.action.u.sa_query.trans_id,
2282 WLAN_SA_QUERY_TR_ID_LEN);
2283
62ae67be 2284 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2285}
2286
2e161f78
JB		 2287static ieee80211_rx_result debug_noinline
2288ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2289{
2290 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2291 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2292
2293 /*
2294 * From here on, look only at management frames.
2295 * Data and control frames are already handled,
2296 * and unknown (reserved) frames are useless.
2297 */
2298 if (rx->skb->len < 24)
2299 return RX_DROP_MONITOR;
2300
2301 if (!ieee80211_is_mgmt(mgmt->frame_control))
2302 return RX_DROP_MONITOR;
2303
ee971924
JB		 2304 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2305 ieee80211_is_beacon(mgmt->frame_control) &&
2306 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2307 int sig = 0;
2308
2309 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2310 sig = status->signal;
2311
ee971924
JB		 2312 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2313 rx->skb->data, rx->skb->len,
37c73b5f 2314 status->freq, sig);
ee971924
JB		 2315 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2316 }
2317
554891e6 2318 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2319 return RX_DROP_MONITOR;
2320
2321 if (ieee80211_drop_unencrypted_mgmt(rx))
2322 return RX_DROP_UNUSABLE;
2323
2324 return RX_CONTINUE;
2325}
2326
de1ede7a
JB		 2327static ieee80211_rx_result debug_noinline
2328ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2329{
2330 struct ieee80211_local *local = rx->local;
eb9fb5b8 2331 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2332 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2334 int len = rx->skb->len;
2335
2336 if (!ieee80211_is_action(mgmt->frame_control))
2337 return RX_CONTINUE;
2338
026331c4
JM		 2339 /* drop too small frames */
2340 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2341 return RX_DROP_UNUSABLE;
de1ede7a 2342
815b8092
MP		 2343 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2344 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
84040805 2345 return RX_DROP_UNUSABLE;
de1ede7a 2346
554891e6 2347 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2348 return RX_DROP_UNUSABLE;
97ebe12a 2349
de1ede7a 2350 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2351 case WLAN_CATEGORY_HT:
2352 /* reject HT action frames from stations not supporting HT */
2353 if (!rx->sta->sta.ht_cap.ht_supported)
2354 goto invalid;
2355
2356 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2357 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2358 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2359 sdata->vif.type != NL80211_IFTYPE_AP &&
2360 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2361 break;
2362
ec61cd63 2363 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2364 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2365 goto invalid;
2366
2367 switch (mgmt->u.action.u.ht_smps.action) {
2368 case WLAN_HT_ACTION_SMPS: {
2369 struct ieee80211_supported_band *sband;
2370 u8 smps;
2371
2372 /* convert to HT capability */
2373 switch (mgmt->u.action.u.ht_smps.smps_control) {
2374 case WLAN_HT_SMPS_CONTROL_DISABLED:
2375 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2376 break;
2377 case WLAN_HT_SMPS_CONTROL_STATIC:
2378 smps = WLAN_HT_CAP_SM_PS_STATIC;
2379 break;
2380 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2381 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2382 break;
2383 default:
2384 goto invalid;
2385 }
2386 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2387
2388 /* if no change do nothing */
2389 if ((rx->sta->sta.ht_cap.cap &
2390 IEEE80211_HT_CAP_SM_PS) == smps)
2391 goto handled;
2392
2393 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2394 rx->sta->sta.ht_cap.cap |= smps;
2395
2396 sband = rx->local->hw.wiphy->bands[status->band];
2397
64f68e5d
JB		 2398 rate_control_rate_update(local, sband, rx->sta,
2399 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2400 goto handled;
2401 }
ec61cd63
JB		 2402 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2403 struct ieee80211_supported_band *sband;
2404 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
2405 bool old_40mhz, new_40mhz;
2406
2407 /* If it doesn't support 40 MHz it can't change ... */
2408 if (!rx->sta->supports_40mhz)
2409 goto handled;
2410
2411 old_40mhz = rx->sta->sta.ht_cap.cap &
2412 IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2413 new_40mhz = chanwidth == IEEE80211_HT_CHANWIDTH_ANY;
2414
2415 if (old_40mhz == new_40mhz)
2416 goto handled;
2417
2418 if (new_40mhz)
2419 rx->sta->sta.ht_cap.cap |=
2420 IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2421 else
2422 rx->sta->sta.ht_cap.cap &=
2423 ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2424
2425 sband = rx->local->hw.wiphy->bands[status->band];
2426
2427 rate_control_rate_update(local, sband, rx->sta,
2428 IEEE80211_RC_BW_CHANGED);
2429 goto handled;
2430 }
1d8d3dec
JB		 2431 default:
2432 goto invalid;
2433 }
2434
2435 break;
de1ede7a 2436 case WLAN_CATEGORY_BACK:
8abd3f9b 2437 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2438 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2439 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2440 sdata->vif.type != NL80211_IFTYPE_AP &&
2441 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2442 break;
8abd3f9b 2443
026331c4
JM		 2444 /* verify action_code is present */
2445 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2446 break;
2447
de1ede7a
JB		 2448 switch (mgmt->u.action.u.addba_req.action_code) {
2449 case WLAN_ACTION_ADDBA_REQ:
2450 if (len < (IEEE80211_MIN_ACTION_SIZE +
2451 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2452 goto invalid;
2453 break;
de1ede7a
JB		 2454 case WLAN_ACTION_ADDBA_RESP:
2455 if (len < (IEEE80211_MIN_ACTION_SIZE +
2456 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2457 goto invalid;
2458 break;
de1ede7a
JB		 2459 case WLAN_ACTION_DELBA:
2460 if (len < (IEEE80211_MIN_ACTION_SIZE +
2461 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2462 goto invalid;
2463 break;
2464 default:
2465 goto invalid;
de1ede7a 2466 }
bed7ee6e 2467
8b58ff83 2468 goto queue;
39192c0b 2469 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2470 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2471 break;
46900298
JB		 2472
2473 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2474 break;
46900298 2475
026331c4
JM		 2476 /* verify action_code is present */
2477 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2478 break;
2479
39192c0b
JB		 2480 switch (mgmt->u.action.u.measurement.action_code) {
2481 case WLAN_ACTION_SPCT_MSR_REQ:
2482 if (len < (IEEE80211_MIN_ACTION_SIZE +
2483 sizeof(mgmt->u.action.u.measurement)))
84040805 2484 break;
39192c0b 2485 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2486 goto handled;
c481ec97
S		 2487 case WLAN_ACTION_SPCT_CHL_SWITCH:
2488 if (len < (IEEE80211_MIN_ACTION_SIZE +
2489 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2490 break;
c481ec97 2491
cc32abd4 2492 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2493 break;
cc32abd4 2494
b203ca39 2495 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2496 break;
c481ec97 2497
8b58ff83 2498 goto queue;
39192c0b
JB		 2499 }
2500 break;
fea14732
JM		 2501 case WLAN_CATEGORY_SA_QUERY:
2502 if (len < (IEEE80211_MIN_ACTION_SIZE +
2503 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2504 break;
2505
fea14732
JM		 2506 switch (mgmt->u.action.u.sa_query.action) {
2507 case WLAN_ACTION_SA_QUERY_REQUEST:
2508 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2509 break;
fea14732 2510 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2511 goto handled;
fea14732
JM		 2512 }
2513 break;
8db09850 2514 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2515 if (len < (IEEE80211_MIN_ACTION_SIZE +
2516 sizeof(mgmt->u.action.u.self_prot.action_code)))
2517 break;
2518
8db09850
TP		 2519 switch (mgmt->u.action.u.self_prot.action_code) {
2520 case WLAN_SP_MESH_PEERING_OPEN:
2521 case WLAN_SP_MESH_PEERING_CLOSE:
2522 case WLAN_SP_MESH_PEERING_CONFIRM:
2523 if (!ieee80211_vif_is_mesh(&sdata->vif))
2524 goto invalid;
2525 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2526 /* userspace handles this frame */
2527 break;
2528 goto queue;
2529 case WLAN_SP_MGK_INFORM:
2530 case WLAN_SP_MGK_ACK:
2531 if (!ieee80211_vif_is_mesh(&sdata->vif))
2532 goto invalid;
2533 break;
2534 }
2535 break;
d3aaec8a 2536 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2537 if (len < (IEEE80211_MIN_ACTION_SIZE +
2538 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2539 break;
2540
77a121c3
JB		 2541 if (!ieee80211_vif_is_mesh(&sdata->vif))
2542 break;
25d49e4d 2543 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2544 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2545 break;
2546 goto queue;
84040805 2547 }
026331c4 2548
2e161f78
JB		 2549 return RX_CONTINUE;
2550
bed7ee6e 2551 invalid:
554891e6 2552 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2553 /* will return in the next handlers */
2554 return RX_CONTINUE;
2555
2556 handled:
2557 if (rx->sta)
2558 rx->sta->rx_packets++;
2559 dev_kfree_skb(rx->skb);
2560 return RX_QUEUED;
2561
2562 queue:
2563 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2564 skb_queue_tail(&sdata->skb_queue, rx->skb);
2565 ieee80211_queue_work(&local->hw, &sdata->work);
2566 if (rx->sta)
2567 rx->sta->rx_packets++;
2568 return RX_QUEUED;
2569}
2570
2571static ieee80211_rx_result debug_noinline
2572ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2573{
554891e6 2574 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2575 int sig = 0;
2e161f78
JB		 2576
2577 /* skip known-bad action frames and return them in the next handler */
554891e6 2578 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2579 return RX_CONTINUE;
d7907448 2580
026331c4
JM		 2581 /*
2582 * Getting here means the kernel doesn't know how to handle
2583 * it, but maybe userspace does ... include returned frames
2584 * so userspace can register for those to know whether ones
2585 * it transmitted were processed or returned.
2586 */
026331c4 2587
804483e9
JB		 2588 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2589 sig = status->signal;
2590
71bbc994 2591 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2592 rx->skb->data, rx->skb->len,
2593 GFP_ATOMIC)) {
2594 if (rx->sta)
2595 rx->sta->rx_packets++;
2596 dev_kfree_skb(rx->skb);
2597 return RX_QUEUED;
2598 }
2599
2e161f78
JB		 2600 return RX_CONTINUE;
2601}
2602
2603static ieee80211_rx_result debug_noinline
2604ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2605{
2606 struct ieee80211_local *local = rx->local;
2607 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2608 struct sk_buff *nskb;
2609 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2610 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2611
2612 if (!ieee80211_is_action(mgmt->frame_control))
2613 return RX_CONTINUE;
2614
2615 /*
2616 * For AP mode, hostapd is responsible for handling any action
2617 * frames that we didn't handle, including returning unknown
2618 * ones. For all other modes we will return them to the sender,
2619 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2620 * 802.11-2012 9.24.4.
2e161f78
JB		 2621 * Newer versions of hostapd shall also use the management frame
2622 * registration mechanisms, but older ones still use cooked
2623 * monitor interfaces so push all frames there.
2624 */
554891e6 2625 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2626 (sdata->vif.type == NL80211_IFTYPE_AP ||
2627 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2628 return RX_DROP_MONITOR;
026331c4 2629
4b5ebccc
JB		 2630 if (is_multicast_ether_addr(mgmt->da))
2631 return RX_DROP_MONITOR;
2632
84040805
JB		 2633 /* do not return rejected action frames */
2634 if (mgmt->u.action.category & 0x80)
2635 return RX_DROP_UNUSABLE;
2636
2637 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2638 GFP_ATOMIC);
2639 if (nskb) {
292b4df6 2640 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2641
292b4df6
JL		 2642 nmgmt->u.action.category |= 0x80;
2643 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2644 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2645
2646 memset(nskb->cb, 0, sizeof(nskb->cb));
2647
2648 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2649 }
39192c0b
JB		 2650 dev_kfree_skb(rx->skb);
2651 return RX_QUEUED;
de1ede7a
JB		 2652}
2653
49461622 2654static ieee80211_rx_result debug_noinline
5cf121c3 2655ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2656{
eb9fb5b8 2657 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2658 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2659 __le16 stype;
571ecf67 2660
77a121c3 2661 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2662
77a121c3
JB		 2663 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2664 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2665 sdata->vif.type != NL80211_IFTYPE_STATION)
2666 return RX_DROP_MONITOR;
472dbc45 2667
77a121c3 2668 switch (stype) {
66e67e41 2669 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2670 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2671 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2672 /* process for all: mesh, mlme, ibss */
2673 break;
66e67e41
JB		 2674 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2675 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2676 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2677 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2678 if (is_multicast_ether_addr(mgmt->da) &&
2679 !is_broadcast_ether_addr(mgmt->da))
2680 return RX_DROP_MONITOR;
2681
77a121c3
JB		 2682 /* process only for station */
2683 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2684 return RX_DROP_MONITOR;
2685 break;
2686 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2687 /* process only for ibss */
2688 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2689 return RX_DROP_MONITOR;
2690 break;
2691 default:
2692 return RX_DROP_MONITOR;
2693 }
f9d540ee 2694
77a121c3 2695 /* queue up frame and kick off work to process it */
c1475ca9 2696 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2697 skb_queue_tail(&sdata->skb_queue, rx->skb);
2698 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2699 if (rx->sta)
2700 rx->sta->rx_packets++;
46900298 2701
77a121c3 2702 return RX_QUEUED;
571ecf67
JB		 2703}
2704
5cf121c3 2705/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2706static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2707 struct ieee80211_rate *rate)
3d30d949
MW		 2708{
2709 struct ieee80211_sub_if_data *sdata;
2710 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2711 struct sk_buff *skb = rx->skb, *skb2;
2712 struct net_device *prev_dev = NULL;
eb9fb5b8 2713 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2714 int needed_headroom;
3d30d949 2715
554891e6
JB		 2716 /*
2717 * If cooked monitor has been processed already, then
2718 * don't do it again. If not, set the flag.
2719 */
2720 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2721 goto out_free_skb;
554891e6 2722 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2723
152c477a
JB		 2724 /* If there are no cooked monitor interfaces, just free the SKB */
2725 if (!local->cooked_mntrs)
2726 goto out_free_skb;
2727
293702a3 2728 /* room for the radiotap header based on driver features */
90b9e446 2729 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2730
293702a3
JB		 2731 if (skb_headroom(skb) < needed_headroom &&
2732 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2733 goto out_free_skb;
3d30d949 2734
293702a3 2735 /* prepend radiotap information */
973ef21a
FF		 2736 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2737 false);
3d30d949
MW		 2738
2739 skb_set_mac_header(skb, 0);
2740 skb->ip_summed = CHECKSUM_UNNECESSARY;
2741 skb->pkt_type = PACKET_OTHERHOST;
2742 skb->protocol = htons(ETH_P_802_2);
2743
2744 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2745 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2746 continue;
2747
05c914fe 2748 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2749 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2750 continue;
2751
2752 if (prev_dev) {
2753 skb2 = skb_clone(skb, GFP_ATOMIC);
2754 if (skb2) {
2755 skb2->dev = prev_dev;
5548a8a1 2756 netif_receive_skb(skb2);
3d30d949
MW		 2757 }
2758 }
2759
2760 prev_dev = sdata->dev;
2761 sdata->dev->stats.rx_packets++;
2762 sdata->dev->stats.rx_bytes += skb->len;
2763 }
2764
2765 if (prev_dev) {
2766 skb->dev = prev_dev;
5548a8a1 2767 netif_receive_skb(skb);
554891e6
JB		 2768 return;
2769 }
3d30d949
MW		 2770
2771 out_free_skb:
2772 dev_kfree_skb(skb);
2773}
2774
aa0c8636
CL		 2775static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2776 ieee80211_rx_result res)
2777{
2778 switch (res) {
2779 case RX_DROP_MONITOR:
2780 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2781 if (rx->sta)
2782 rx->sta->rx_dropped++;
2783 /* fall through */
2784 case RX_CONTINUE: {
2785 struct ieee80211_rate *rate = NULL;
2786 struct ieee80211_supported_band *sband;
2787 struct ieee80211_rx_status *status;
2788
2789 status = IEEE80211_SKB_RXCB((rx->skb));
2790
2791 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2792 if (!(status->flag & RX_FLAG_HT) &&
2793 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2794 rate = &sband->bitrates[status->rate_idx];
2795
2796 ieee80211_rx_cooked_monitor(rx, rate);
2797 break;
2798 }
2799 case RX_DROP_UNUSABLE:
2800 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2801 if (rx->sta)
2802 rx->sta->rx_dropped++;
2803 dev_kfree_skb(rx->skb);
2804 break;
2805 case RX_QUEUED:
2806 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2807 break;
2808 }
2809}
571ecf67 2810
24a8fdad 2811static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2812{
58905290 2813 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2814 struct sk_buff *skb;
8944b79f 2815
e32f85f7
LCC		 2816#define CALL_RXH(rxh) \
2817 do { \
2818 res = rxh(rx); \
2819 if (res != RX_CONTINUE) \
2569a826 2820 goto rxh_next; \
e32f85f7 2821 } while (0);
49461622 2822
24a8fdad
CL		 2823 spin_lock(&rx->local->rx_skb_queue.lock);
2824 if (rx->local->running_rx_handler)
2825 goto unlock;
2826
2827 rx->local->running_rx_handler = true;
2828
2829 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2830 spin_unlock(&rx->local->rx_skb_queue.lock);
2831
2569a826
JB		 2832 /*
2833 * all the other fields are valid across frames
2834 * that belong to an aMPDU since they are on the
2835 * same TID from the same station
2836 */
2837 rx->skb = skb;
2838
2839 CALL_RXH(ieee80211_rx_h_decrypt)
2840 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2841 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2842 CALL_RXH(ieee80211_rx_h_sta_process)
2843 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2844 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2845 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2846#ifdef CONFIG_MAC80211_MESH
aa0c8636 2847 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2848 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2849#endif
2154c81c 2850 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2851 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2852 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2853 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2854 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2855 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2856 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2857 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2858
aa0c8636
CL		 2859 rxh_next:
2860 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2861 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2862#undef CALL_RXH
aa0c8636 2863 }
24a8fdad
CL		 2864
2865 rx->local->running_rx_handler = false;
2866
2867 unlock:
2868 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2869}
2870
4406c376 2871static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2872{
aa0c8636
CL		 2873 ieee80211_rx_result res = RX_DROP_MONITOR;
2874
aa0c8636
CL		 2875#define CALL_RXH(rxh) \
2876 do { \
2877 res = rxh(rx); \
2878 if (res != RX_CONTINUE) \
2879 goto rxh_next; \
2880 } while (0);
2881
aa0c8636
CL		 2882 CALL_RXH(ieee80211_rx_h_check)
2883
24a8fdad 2884 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2885
24a8fdad 2886 ieee80211_rx_handlers(rx);
aa0c8636 2887 return;
49461622 2888
2569a826 2889 rxh_next:
aa0c8636
CL		 2890 ieee80211_rx_handlers_result(rx, res);
2891
2892#undef CALL_RXH
58905290
JB		 2893}
2894
2bff8ebf 2895/*
dd318575
JB		 2896 * This function makes calls into the RX path, therefore
2897 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2898 */
2899void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2900{
554891e6
JB		 2901 struct ieee80211_rx_data rx = {
2902 .sta = sta,
2903 .sdata = sta->sdata,
2904 .local = sta->local,
9e26297a
JB		 2905 /* This is OK -- must be QoS data frame */
2906 .security_idx = tid,
2907 .seqno_idx = tid,
fcf8bd3b 2908 .flags = 0,
554891e6 2909 };
2c15a0cf
CL		 2910 struct tid_ampdu_rx *tid_agg_rx;
2911
2912 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2913 if (!tid_agg_rx)
2914 return;
2bff8ebf 2915
2c15a0cf 2916 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2917 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2918 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2919
24a8fdad 2920 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2921}
2922
571ecf67
JB		 2923/* main receive path */
2924
20b01f80 2925static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2926 struct ieee80211_hdr *hdr)
2927{
20b01f80 2928 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2929 struct sk_buff *skb = rx->skb;
2930 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2931 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2932 int multicast = is_multicast_ether_addr(hdr->addr1);
2933
51fb61e7 2934 switch (sdata->vif.type) {
05c914fe 2935 case NL80211_IFTYPE_STATION:
9bc383de 2936 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2937 return 0;
77fdaa12 2938 if (!multicast &&
b203ca39 2939 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2940 if (!(sdata->dev->flags & IFF_PROMISC) ||
2941 sdata->u.mgd.use_4addr)
23a24def 2942 return 0;
554891e6 2943 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2944 }
2945 break;
05c914fe 2946 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2947 if (!bssid)
2948 return 0;
a7767f95 2949 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2950 return 1;
d48b2968
JB		 2951 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2952 return 0;
23a24def 2953 } else if (!multicast &&
b203ca39 2954 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2955 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2956 return 0;
554891e6 2957 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2958 } else if (!rx->sta) {
2959 int rate_idx;
5614618e
JB		 2960 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
2961 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 2962 else
eb9fb5b8 2963 rate_idx = status->rate_idx;
8bf11d8d
JB		 2964 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2965 BIT(rate_idx));
0fb8ca45 2966 }
23a24def 2967 break;
05c914fe 2968 case NL80211_IFTYPE_MESH_POINT:
6032f934 2969 if (!multicast &&
b203ca39 2970 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2971 if (!(sdata->dev->flags & IFF_PROMISC))
2972 return 0;
2973
554891e6 2974 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2975 }
2976 break;
05c914fe
JB		 2977 case NL80211_IFTYPE_AP_VLAN:
2978 case NL80211_IFTYPE_AP:
23a24def 2979 if (!bssid) {
b203ca39 2980 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2981 return 0;
f142c6b9 2982 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2983 /*
2984 * Accept public action frames even when the
2985 * BSSID doesn't match, this is used for P2P
2986 * and location updates. Note that mac80211
2987 * itself never looks at these frames.
2988 */
d48b2968 2989 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2990 return 1;
d48b2968 2991 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2992 return 0;
554891e6 2993 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2994 }
23a24def 2995 break;
05c914fe 2996 case NL80211_IFTYPE_WDS:
a7767f95 2997 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2998 return 0;
b203ca39 2999 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 3000 return 0;
3001 break;
f142c6b9
JB		 3002 case NL80211_IFTYPE_P2P_DEVICE:
3003 if (!ieee80211_is_public_action(hdr, skb->len) &&
3004 !ieee80211_is_probe_req(hdr->frame_control) &&
3005 !ieee80211_is_probe_resp(hdr->frame_control) &&
3006 !ieee80211_is_beacon(hdr->frame_control))
3007 return 0;
3008 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3009 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3010 break;
2ca27bcf 3011 default:
fb1c1cd6 3012 /* should never get here */
f142c6b9 3013 WARN_ON_ONCE(1);
fb1c1cd6 3014 break;
23a24def
JB		 3015 }
3016
3017 return 1;
3018}
3019
4406c376
JB		 3020/*
3021 * This function returns whether or not the SKB
3022 * was destined for RX processing or not, which,
3023 * if consume is true, is equivalent to whether
3024 * or not the skb was consumed.
3025 */
3026static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3027 struct sk_buff *skb, bool consume)
3028{
3029 struct ieee80211_local *local = rx->local;
3030 struct ieee80211_sub_if_data *sdata = rx->sdata;
3031 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3032 struct ieee80211_hdr *hdr = (void *)skb->data;
3033 int prepares;
3034
3035 rx->skb = skb;
554891e6 3036 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 3037 prepares = prepare_for_handlers(rx, hdr);
3038
3039 if (!prepares)
3040 return false;
3041
4406c376
JB		 3042 if (!consume) {
3043 skb = skb_copy(skb, GFP_ATOMIC);
3044 if (!skb) {
3045 if (net_ratelimit())
3046 wiphy_debug(local->hw.wiphy,
b305dae4 3047 "failed to copy skb for %s\n",
4406c376
JB		 3048 sdata->name);
3049 return true;
3050 }
3051
3052 rx->skb = skb;
3053 }
3054
3055 ieee80211_invoke_rx_handlers(rx);
3056 return true;
3057}
3058
571ecf67 3059/*
6368e4b1
RR		 3060 * This is the actual Rx frames handler. as it blongs to Rx path it must
3061 * be called with rcu_read_lock protection.
571ecf67 3062 */
71ebb4aa 3063static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3064 struct sk_buff *skb)
571ecf67
JB		 3065{
3066 struct ieee80211_local *local = hw_to_local(hw);
3067 struct ieee80211_sub_if_data *sdata;
571ecf67 3068 struct ieee80211_hdr *hdr;
e3cf8b3f 3069 __le16 fc;
5cf121c3 3070 struct ieee80211_rx_data rx;
4406c376 3071 struct ieee80211_sub_if_data *prev;
56af3268 3072 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3073 int err = 0;
571ecf67 3074
e3cf8b3f 3075 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3076 memset(&rx, 0, sizeof(rx));
3077 rx.skb = skb;
3078 rx.local = local;
72abd81b 3079
e3cf8b3f 3080 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3081 local->dot11ReceivedFragmentCount++;
571ecf67 3082
4a4f1a58
JB		 3083 if (ieee80211_is_mgmt(fc)) {
3084 /* drop frame if too short for header */
3085 if (skb->len < ieee80211_hdrlen(fc))
3086 err = -ENOBUFS;
3087 else
3088 err = skb_linearize(skb);
3089 } else {
e3cf8b3f 3090 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3091 }
e3cf8b3f
ZY		 3092
3093 if (err) {
3094 dev_kfree_skb(skb);
3095 return;
3096 }
3097
3098 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3099 ieee80211_parse_qos(&rx);
d1c3a37c 3100 ieee80211_verify_alignment(&rx);
38f3714d 3101
d48b2968
JB		 3102 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3103 ieee80211_is_beacon(hdr->frame_control)))
3104 ieee80211_scan_rx(local, skb);
3105
e3cf8b3f 3106 if (ieee80211_is_data(fc)) {
56af3268 3107 prev_sta = NULL;
4406c376 3108
7852e361 3109 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3110 if (!prev_sta) {
3111 prev_sta = sta;
3112 continue;
3113 }
3114
3115 rx.sta = prev_sta;
3116 rx.sdata = prev_sta->sdata;
4406c376 3117 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3118
56af3268 3119 prev_sta = sta;
4406c376 3120 }
56af3268
BG		 3121
3122 if (prev_sta) {
3123 rx.sta = prev_sta;
3124 rx.sdata = prev_sta->sdata;
3125
4406c376 3126 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3127 return;
8e26d5ad 3128 goto out;
56af3268 3129 }
4406c376
JB		 3130 }
3131
4b0dd98e 3132 prev = NULL;
b2e7771e 3133
4b0dd98e
JB		 3134 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3135 if (!ieee80211_sdata_running(sdata))
3136 continue;
340e11f3 3137
4b0dd98e
JB		 3138 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3139 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3140 continue;
340e11f3 3141
4b0dd98e
JB		 3142 /*
3143 * frame is destined for this interface, but if it's
3144 * not also for the previous one we handle that after
3145 * the loop to avoid copying the SKB once too much
3146 */
4bb29f8c 3147
4b0dd98e 3148 if (!prev) {
abe60632 3149 prev = sdata;
4b0dd98e 3150 continue;
340e11f3 3151 }
4bb29f8c 3152
7852e361 3153 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3154 rx.sdata = prev;
3155 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3156
4b0dd98e
JB		 3157 prev = sdata;
3158 }
3159
3160 if (prev) {
7852e361 3161 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3162 rx.sdata = prev;
4406c376 3163
4b0dd98e
JB		 3164 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3165 return;
571ecf67 3166 }
4406c376 3167
8e26d5ad 3168 out:
4406c376 3169 dev_kfree_skb(skb);
571ecf67 3170}
6368e4b1
RR		 3171
3172/*
3173 * This is the receive path handler. It is called by a low level driver when an
3174 * 802.11 MPDU is received from the hardware.
3175 */
103bf9f7 3176void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3177{
3178 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3179 struct ieee80211_rate *rate = NULL;
3180 struct ieee80211_supported_band *sband;
f1d58c25 3181 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3182
d20ef63d
JB		 3183 WARN_ON_ONCE(softirq_count() == 0);
3184
444e3803 3185 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3186 goto drop;
8318d78a
JB		 3187
3188 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3189 if (WARN_ON(!sband))
3190 goto drop;
8318d78a 3191
89c3a8ac
JB		 3192 /*
3193 * If we're suspending, it is possible although not too likely
3194 * that we'd be receiving frames after having already partially
3195 * quiesced the stack. We can't process such frames then since
3196 * that might, for example, cause stations to be added or other
3197 * driver callbacks be invoked.
3198 */
77a980dc
JB		 3199 if (unlikely(local->quiescing || local->suspended))
3200 goto drop;
89c3a8ac 3201
04800ada
AN		 3202 /* We might be during a HW reconfig, prevent Rx for the same reason */
3203 if (unlikely(local->in_reconfig))
3204 goto drop;
3205
ea77f12f
JB		 3206 /*
3207 * The same happens when we're not even started,
3208 * but that's worth a warning.
3209 */
77a980dc
JB		 3210 if (WARN_ON(!local->started))
3211 goto drop;
ea77f12f 3212
fc885189 3213 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3214 /*
fc885189
JB		 3215 * Validate the rate, unless a PLCP error means that
3216 * we probably can't have a valid rate here anyway.
e5d6eb83 3217 */
fc885189
JB		 3218
3219 if (status->flag & RX_FLAG_HT) {
3220 /*
3221 * rate_idx is MCS index, which can be [0-76]
3222 * as documented on:
3223 *
3224 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3225 *
3226 * Anything else would be some sort of driver or
3227 * hardware error. The driver should catch hardware
3228 * errors.
3229 */
444e3803 3230 if (WARN(status->rate_idx > 76,
fc885189
JB		 3231 "Rate marked as an HT rate but passed "
3232 "status->rate_idx is not "
3233 "an MCS index [0-76]: %d (0x%02x)\n",
3234 status->rate_idx,
3235 status->rate_idx))
3236 goto drop;
5614618e
JB		 3237 } else if (status->flag & RX_FLAG_VHT) {
3238 if (WARN_ONCE(status->rate_idx > 9 ||
3239 !status->vht_nss ||
3240 status->vht_nss > 8,
3241 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3242 status->rate_idx, status->vht_nss))
3243 goto drop;
fc885189 3244 } else {
444e3803 3245 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3246 goto drop;
3247 rate = &sband->bitrates[status->rate_idx];
3248 }
0fb8ca45 3249 }
6368e4b1 3250
554891e6
JB		 3251 status->rx_flags = 0;
3252
6368e4b1
RR		 3253 /*
3254 * key references and virtual interfaces are protected using RCU
3255 * and this requires that we are in a read-side RCU section during
3256 * receive processing
3257 */
3258 rcu_read_lock();
3259
3260 /*
3261 * Frames with failed FCS/PLCP checksum are not returned,
3262 * all other frames are returned without radiotap header
3263 * if it was previously present.
3264 * Also, frames with less than 16 bytes are dropped.
3265 */
f1d58c25 3266 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3267 if (!skb) {
3268 rcu_read_unlock();
3269 return;
3270 }
3271
e1e54068
JB		 3272 ieee80211_tpt_led_trig_rx(local,
3273 ((struct ieee80211_hdr *)skb->data)->frame_control,
3274 skb->len);
071d9ac2 3275 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3276
3277 rcu_read_unlock();
77a980dc
JB		 3278
3279 return;
3280 drop:
3281 kfree_skb(skb);
6368e4b1 3282}
103bf9f7 3283EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3284
3285/* This is a version of the rx handler that can be called from hard irq
3286 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3287void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3288{
3289 struct ieee80211_local *local = hw_to_local(hw);
3290
3291 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3292
571ecf67
JB		 3293 skb->pkt_type = IEEE80211_RX_MSG;
3294 skb_queue_tail(&local->skb_queue, skb);
3295 tasklet_schedule(&local->tasklet);
3296}
3297EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)