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mac80211: cache mesh beacon
[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,
f9e124fb
CL		 671 int index,
672 struct sk_buff_head *frames)
1edfb1af 673{
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;
f9e124fb 687 __skb_queue_tail(frames, 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,
f9e124fb
CL		 695 u16 head_seq_num,
696 struct sk_buff_head *frames)
1edfb1af
JB		 697{
698 int index;
699
dd318575
JB		 700 lockdep_assert_held(&tid_agg_rx->reorder_lock);
701
1edfb1af
JB		 702 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
703 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
704 tid_agg_rx->buf_size;
f9e124fb
CL		 705 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
706 frames);
1edfb1af
JB		 707 }
708}
709
710/*
711 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
712 * the skb was added to the buffer longer than this time ago, the earlier
713 * frames that have not yet been received are assumed to be lost and the skb
714 * can be released for processing. This may also release other skb's from the
715 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 716 *
717 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 718 */
719#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
720
d3b2fb53 721static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 722 struct tid_ampdu_rx *tid_agg_rx,
723 struct sk_buff_head *frames)
aa0c8636 724{
2bff8ebf 725 int index, j;
aa0c8636 726
dd318575
JB		 727 lockdep_assert_held(&tid_agg_rx->reorder_lock);
728
aa0c8636
CL		 729 /* release the buffer until next missing frame */
730 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
731 tid_agg_rx->buf_size;
732 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 733 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 734 /*
735 * No buffers ready to be released, but check whether any
736 * frames in the reorder buffer have timed out.
737 */
aa0c8636
CL		 738 int skipped = 1;
739 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
740 j = (j + 1) % tid_agg_rx->buf_size) {
741 if (!tid_agg_rx->reorder_buf[j]) {
742 skipped++;
743 continue;
744 }
499fe9a4
DH		 745 if (skipped &&
746 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 747 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 748 goto set_release_timer;
aa0c8636 749
bdcbd8e0
JB		 750 ht_dbg_ratelimited(sdata,
751 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 752 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
753 frames);
aa0c8636
CL		 754
755 /*
756 * Increment the head seq# also for the skipped slots.
757 */
758 tid_agg_rx->head_seq_num =
759 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
760 skipped = 0;
761 }
762 } else while (tid_agg_rx->reorder_buf[index]) {
f9e124fb
CL		 763 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
764 frames);
aa0c8636
CL		 765 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
766 tid_agg_rx->buf_size;
767 }
2bff8ebf
CL		 768
769 if (tid_agg_rx->stored_mpdu_num) {
770 j = index = seq_sub(tid_agg_rx->head_seq_num,
771 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
772
773 for (; j != (index - 1) % tid_agg_rx->buf_size;
774 j = (j + 1) % tid_agg_rx->buf_size) {
775 if (tid_agg_rx->reorder_buf[j])
776 break;
777 }
778
779 set_release_timer:
780
781 mod_timer(&tid_agg_rx->reorder_timer,
334df731 782 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 783 HT_RX_REORDER_BUF_TIMEOUT);
784 } else {
785 del_timer(&tid_agg_rx->reorder_timer);
786 }
aa0c8636
CL		 787}
788
1edfb1af
JB		 789/*
790 * As this function belongs to the RX path it must be under
791 * rcu_read_lock protection. It returns false if the frame
792 * can be processed immediately, true if it was consumed.
793 */
d3b2fb53 794static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 795 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 796 struct sk_buff *skb,
797 struct sk_buff_head *frames)
1edfb1af
JB		 798{
799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
800 u16 sc = le16_to_cpu(hdr->seq_ctrl);
801 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
802 u16 head_seq_num, buf_size;
803 int index;
2bff8ebf 804 bool ret = true;
1edfb1af 805
dd318575
JB		 806 spin_lock(&tid_agg_rx->reorder_lock);
807
1edfb1af
JB		 808 buf_size = tid_agg_rx->buf_size;
809 head_seq_num = tid_agg_rx->head_seq_num;
810
811 /* frame with out of date sequence number */
812 if (seq_less(mpdu_seq_num, head_seq_num)) {
813 dev_kfree_skb(skb);
2bff8ebf 814 goto out;
1edfb1af
JB		 815 }
816
817 /*
818 * If frame the sequence number exceeds our buffering window
819 * size release some previous frames to make room for this one.
820 */
821 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
822 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
823 /* release stored frames up to new head to stack */
d3b2fb53 824 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 825 head_seq_num, frames);
1edfb1af
JB		 826 }
827
828 /* Now the new frame is always in the range of the reordering buffer */
829
830 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
831
832 /* check if we already stored this frame */
833 if (tid_agg_rx->reorder_buf[index]) {
834 dev_kfree_skb(skb);
2bff8ebf 835 goto out;
1edfb1af
JB		 836 }
837
838 /*
839 * If the current MPDU is in the right order and nothing else
840 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 841 * If it is first but there's something stored, we may be able
842 * to release frames after this one.
1edfb1af
JB		 843 */
844 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
845 tid_agg_rx->stored_mpdu_num == 0) {
846 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 847 ret = false;
848 goto out;
1edfb1af
JB		 849 }
850
851 /* put the frame in the reordering buffer */
852 tid_agg_rx->reorder_buf[index] = skb;
853 tid_agg_rx->reorder_time[index] = jiffies;
854 tid_agg_rx->stored_mpdu_num++;
f9e124fb 855 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1edfb1af 856
2bff8ebf
CL		 857 out:
858 spin_unlock(&tid_agg_rx->reorder_lock);
859 return ret;
1edfb1af
JB		 860}
861
862/*
863 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
864 * true if the MPDU was buffered, false if it should be processed.
865 */
f9e124fb
CL		 866static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
867 struct sk_buff_head *frames)
1edfb1af 868{
2569a826
JB		 869 struct sk_buff *skb = rx->skb;
870 struct ieee80211_local *local = rx->local;
1edfb1af 871 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 872 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 873 struct sta_info *sta = rx->sta;
1edfb1af
JB		 874 struct tid_ampdu_rx *tid_agg_rx;
875 u16 sc;
6cc00d54 876 u8 tid, ack_policy;
1edfb1af
JB		 877
878 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 879 goto dont_reorder;
1edfb1af
JB		 880
881 /*
882 * filter the QoS data rx stream according to
883 * STA/TID and check if this STA/TID is on aggregation
884 */
885
1edfb1af 886 if (!sta)
2569a826 887 goto dont_reorder;
1edfb1af 888
6cc00d54
TP		 889 ack_policy = *ieee80211_get_qos_ctl(hdr) &
890 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 891 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
892
a87f736d
JB		 893 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
894 if (!tid_agg_rx)
895 goto dont_reorder;
1edfb1af
JB		 896
897 /* qos null data frames are excluded */
898 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 899 goto dont_reorder;
1edfb1af 900
6cc00d54
TP		 901 /* not part of a BA session */
902 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
903 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
904 goto dont_reorder;
905
660c6a44
TP		 906 /* not actually part of this BA session */
907 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
908 goto dont_reorder;
909
1edfb1af
JB		 910 /* new, potentially un-ordered, ampdu frame - process it */
911
912 /* reset session timer */
913 if (tid_agg_rx->timeout)
12d3952f 914 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 915
916 /* if this mpdu is fragmented - terminate rx aggregation session */
917 sc = le16_to_cpu(hdr->seq_ctrl);
918 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 919 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 920 skb_queue_tail(&rx->sdata->skb_queue, skb);
921 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 922 return;
1edfb1af
JB		 923 }
924
a87f736d
JB		 925 /*
926 * No locking needed -- we will only ever process one
927 * RX packet at a time, and thus own tid_agg_rx. All
928 * other code manipulating it needs to (and does) make
929 * sure that we cannot get to it any more before doing
930 * anything with it.
931 */
f9e124fb
CL		 932 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
933 frames))
2569a826
JB		 934 return;
935
936 dont_reorder:
f9e124fb 937 __skb_queue_tail(frames, skb);
1edfb1af 938}
33b64eb2 939
49461622 940static ieee80211_rx_result debug_noinline
5cf121c3 941ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 942{
a7767f95 943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 945
946 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
947 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 948 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 949 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 950 hdr->seq_ctrl)) {
554891e6 951 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 952 rx->local->dot11FrameDuplicateCount++;
953 rx->sta->num_duplicates++;
954 }
b1f93314 955 return RX_DROP_UNUSABLE;
571ecf67 956 } else
9e26297a 957 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 958 }
959
571ecf67
JB		 960 if (unlikely(rx->skb->len < 16)) {
961 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 962 return RX_DROP_MONITOR;
571ecf67
JB		 963 }
964
571ecf67
JB		 965 /* Drop disallowed frame classes based on STA auth/assoc state;
966 * IEEE 802.11, Chap 5.5.
967 *
ccd7b362
JB		 968 * mac80211 filters only based on association state, i.e. it drops
969 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 970 * deauth/disassoc frames when needed. In addition, hostapd is
971 * responsible for filtering on both auth and assoc states.
972 */
33b64eb2 973
902acc78 974 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 975 return ieee80211_rx_mesh_check(rx);
33b64eb2 976
a7767f95
HH		 977 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
978 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 979 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 980 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 981 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 982 /*
983 * accept port control frames from the AP even when it's not
984 * yet marked ASSOC to prevent a race where we don't set the
985 * assoc bit quickly enough before it sends the first frame
986 */
987 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 988 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 989 unsigned int hdrlen;
990 __be16 ethertype;
991
992 hdrlen = ieee80211_hdrlen(hdr->frame_control);
993
994 if (rx->skb->len < hdrlen + 8)
995 return RX_DROP_MONITOR;
996
997 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
998 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 999 return RX_CONTINUE;
1000 }
21fc7560
JB		 1001
1002 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1003 cfg80211_rx_spurious_frame(rx->sdata->dev,
1004 hdr->addr2,
1005 GFP_ATOMIC))
1006 return RX_DROP_UNUSABLE;
1007
e4c26add 1008 return RX_DROP_MONITOR;
2a33bee2 1009 }
571ecf67 1010
9ae54c84 1011 return RX_CONTINUE;
570bd537
JB		 1012}
1013
1014
49461622 1015static ieee80211_rx_result debug_noinline
5cf121c3 1016ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 1017{
eb9fb5b8
JB		 1018 struct sk_buff *skb = rx->skb;
1019 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1020 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 1021 int keyidx;
1022 int hdrlen;
e4c26add 1023 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 1024 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 1025 int mmie_keyidx = -1;
761ab470 1026 __le16 fc;
570bd537 1027
3017b80b
JB		 1028 /*
1029 * Key selection 101
1030 *
3cfcf6ac 1031 * There are four types of keys:
3017b80b 1032 * - GTK (group keys)
3cfcf6ac 1033 * - IGTK (group keys for management frames)
3017b80b
JB		 1034 * - PTK (pairwise keys)
1035 * - STK (station-to-station pairwise keys)
1036 *
1037 * When selecting a key, we have to distinguish between multicast
1038 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 1039 * use PTKs and STKs while the former always use GTKs and IGTKs.
1040 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1041 * unicast frames can also use key indices like GTKs. Hence, if we
1042 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 1043 *
8dc06a1c
JB		 1044 * Note that in a regular BSS, multicast frames are sent by the
1045 * AP only, associated stations unicast the frame to the AP first
1046 * which then multicasts it on their behalf.
1047 *
3017b80b
JB		 1048 * There is also a slight problem in IBSS mode: GTKs are negotiated
1049 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 1050 * The spec seems to expect that one negotiates the same key with
1051 * every station but there's no such requirement; VLANs could be
1052 * possible.
3017b80b
JB		 1053 */
1054
3017b80b 1055 /*
1990af8d 1056 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 1057 * addressed to us nor a multicast frame.
1058 */
554891e6 1059 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1060 return RX_CONTINUE;
3017b80b 1061
2569a826
JB		 1062 /* start without a key */
1063 rx->key = NULL;
1064
d4e46a3d 1065 if (rx->sta)
e31b8213 1066 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 1067
761ab470
JB		 1068 fc = hdr->frame_control;
1069
1070 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 1071 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1072
e31b8213
JB		 1073 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1074 rx->key = sta_ptk;
dc1580dd
JB		 1075 if ((status->flag & RX_FLAG_DECRYPTED) &&
1076 (status->flag & RX_FLAG_IV_STRIPPED))
1077 return RX_CONTINUE;
0c7c10c7 1078 /* Skip decryption if the frame is not protected. */
761ab470 1079 if (!ieee80211_has_protected(fc))
0c7c10c7 1080 return RX_CONTINUE;
3cfcf6ac
JM		 1081 } else if (mmie_keyidx >= 0) {
1082 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 1083 if ((status->flag & RX_FLAG_DECRYPTED) &&
1084 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 1085 return RX_CONTINUE;
1086
1087 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1088 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1089 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 1090 if (rx->sta)
1091 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1092 if (!rx->key)
1093 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 1094 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 1095 /*
1096 * The frame was not protected, so skip decryption. However, we
1097 * need to set rx->key if there is a key that could have been
1098 * used so that the frame may be dropped if encryption would
1099 * have been expected.
1100 */
1101 struct ieee80211_key *key = NULL;
897bed8b
JB		 1102 struct ieee80211_sub_if_data *sdata = rx->sdata;
1103 int i;
1104
761ab470 1105 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1106 is_multicast_ether_addr(hdr->addr1) &&
1107 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1108 rx->key = key;
897bed8b
JB		 1109 else {
1110 if (rx->sta) {
1111 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1112 key = rcu_dereference(rx->sta->gtk[i]);
1113 if (key)
1114 break;
1115 }
1116 }
1117 if (!key) {
1118 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1119 key = rcu_dereference(sdata->keys[i]);
1120 if (key)
1121 break;
1122 }
1123 }
1124 if (key)
1125 rx->key = key;
1126 }
0c7c10c7 1127 return RX_CONTINUE;
571ecf67 1128 } else {
39184b15 1129 u8 keyid;
3017b80b
JB		 1130 /*
1131 * The device doesn't give us the IV so we won't be
1132 * able to look up the key. That's ok though, we
1133 * don't need to decrypt the frame, we just won't
1134 * be able to keep statistics accurate.
1135 * Except for key threshold notifications, should
1136 * we somehow allow the driver to tell us which key
1137 * the hardware used if this flag is set?
1138 */
eb9fb5b8
JB		 1139 if ((status->flag & RX_FLAG_DECRYPTED) &&
1140 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1141 return RX_CONTINUE;
3017b80b 1142
761ab470 1143 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1144
1145 if (rx->skb->len < 8 + hdrlen)
e4c26add 1146 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1147
1148 /*
1149 * no need to call ieee80211_wep_get_keyidx,
1150 * it verifies a bunch of things we've done already
1151 */
39184b15
ZY		 1152 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1153 keyidx = keyid >> 6;
3017b80b 1154
e31b8213
JB		 1155 /* check per-station GTK first, if multicast packet */
1156 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1157 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1158
e31b8213
JB		 1159 /* if not found, try default key */
1160 if (!rx->key) {
1161 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1162
1163 /*
1164 * RSNA-protected unicast frames should always be
1165 * sent with pairwise or station-to-station keys,
1166 * but for WEP we allow using a key index as well.
1167 */
1168 if (rx->key &&
1169 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1170 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1171 !is_multicast_ether_addr(hdr->addr1))
1172 rx->key = NULL;
1173 }
571ecf67
JB		 1174 }
1175
3017b80b 1176 if (rx->key) {
95acac61
JB		 1177 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1178 return RX_DROP_MONITOR;
1179
571ecf67 1180 rx->key->tx_rx_count++;
011bfcc4 1181 /* TODO: add threshold stuff again */
1990af8d 1182 } else {
e4c26add 1183 return RX_DROP_MONITOR;
70f08765
JB		 1184 }
1185
97359d12
JB		 1186 switch (rx->key->conf.cipher) {
1187 case WLAN_CIPHER_SUITE_WEP40:
1188 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1189 result = ieee80211_crypto_wep_decrypt(rx);
1190 break;
97359d12 1191 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1192 result = ieee80211_crypto_tkip_decrypt(rx);
1193 break;
97359d12 1194 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1195 result = ieee80211_crypto_ccmp_decrypt(rx);
1196 break;
97359d12 1197 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1198 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1199 break;
3ffc2a90
JB		 1200 default:
1201 /*
1202 * We can reach here only with HW-only algorithms
1203 * but why didn't it decrypt the frame?!
1204 */
1205 return RX_DROP_UNUSABLE;
70f08765
JB		 1206 }
1207
a8286911
JB		 1208 /* the hdr variable is invalid after the decrypt handlers */
1209
e2f036da 1210 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1211 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1212
1213 return result;
70f08765
JB		 1214}
1215
572e0012
KV		 1216static ieee80211_rx_result debug_noinline
1217ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1218{
1219 struct ieee80211_local *local;
1220 struct ieee80211_hdr *hdr;
1221 struct sk_buff *skb;
1222
1223 local = rx->local;
1224 skb = rx->skb;
1225 hdr = (struct ieee80211_hdr *) skb->data;
1226
1227 if (!local->pspolling)
1228 return RX_CONTINUE;
1229
1230 if (!ieee80211_has_fromds(hdr->frame_control))
1231 /* this is not from AP */
1232 return RX_CONTINUE;
1233
1234 if (!ieee80211_is_data(hdr->frame_control))
1235 return RX_CONTINUE;
1236
1237 if (!ieee80211_has_moredata(hdr->frame_control)) {
1238 /* AP has no more frames buffered for us */
1239 local->pspolling = false;
1240 return RX_CONTINUE;
1241 }
1242
1243 /* more data bit is set, let's request a new frame from the AP */
1244 ieee80211_send_pspoll(local, rx->sdata);
1245
1246 return RX_CONTINUE;
1247}
1248
d012a605 1249static void sta_ps_start(struct sta_info *sta)
571ecf67 1250{
133b8226 1251 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1252 struct ieee80211_local *local = sdata->local;
d012a605 1253 struct ps_data *ps;
0795af57 1254
d012a605
MP		 1255 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1256 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1257 ps = &sdata->bss->ps;
1258 else
1259 return;
1260
1261 atomic_inc(&ps->num_sta_ps);
c2c98fde 1262 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1263 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1264 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1265 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1266 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1267}
1268
d012a605 1269static void sta_ps_end(struct sta_info *sta)
571ecf67 1270{
bdcbd8e0
JB		 1271 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1272 sta->sta.addr, sta->sta.aid);
004c872e 1273
c2c98fde 1274 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1275 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1276 sta->sta.addr, sta->sta.aid);
af818581
JB		 1277 return;
1278 }
1279
1280 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1281}
1282
d057e5a3
AN		 1283int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1284{
1285 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1286 bool in_ps;
1287
1288 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1289
1290 /* Don't let the same PS state be set twice */
c2c98fde 1291 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1292 if ((start && in_ps) || (!start && !in_ps))
1293 return -EINVAL;
1294
1295 if (start)
d012a605 1296 sta_ps_start(sta_inf);
d057e5a3 1297 else
d012a605 1298 sta_ps_end(sta_inf);
d057e5a3
AN		 1299
1300 return 0;
1301}
1302EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1303
47086fc5
JB		 1304static ieee80211_rx_result debug_noinline
1305ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1306{
1307 struct ieee80211_sub_if_data *sdata = rx->sdata;
1308 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1309 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1310 int tid, ac;
1311
1312 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1313 return RX_CONTINUE;
1314
1315 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1316 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1317 return RX_CONTINUE;
1318
1319 /*
1320 * The device handles station powersave, so don't do anything about
1321 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1322 * it to mac80211 since they're handled.)
1323 */
1324 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1325 return RX_CONTINUE;
1326
1327 /*
1328 * Don't do anything if the station isn't already asleep. In
1329 * the uAPSD case, the station will probably be marked asleep,
1330 * in the PS-Poll case the station must be confused ...
1331 */
c2c98fde 1332 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1333 return RX_CONTINUE;
1334
1335 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1336 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1337 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1338 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1339 else
c2c98fde 1340 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1341 }
47086fc5
JB		 1342
1343 /* Free PS Poll skb here instead of returning RX_DROP that would
1344 * count as an dropped frame. */
1345 dev_kfree_skb(rx->skb);
1346
1347 return RX_QUEUED;
1348 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1349 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1350 ieee80211_has_pm(hdr->frame_control) &&
1351 (ieee80211_is_data_qos(hdr->frame_control) ||
1352 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1353 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1354 ac = ieee802_1d_to_ac[tid & 7];
1355
1356 /*
1357 * If this AC is not trigger-enabled do nothing.
1358 *
1359 * NB: This could/should check a separate bitmap of trigger-
1360 * enabled queues, but for now we only implement uAPSD w/o
1361 * TSPEC changes to the ACs, so they're always the same.
1362 */
1363 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1364 return RX_CONTINUE;
1365
1366 /* if we are in a service period, do nothing */
c2c98fde 1367 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1368 return RX_CONTINUE;
1369
c2c98fde 1370 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1371 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1372 else
c2c98fde 1373 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1374 }
1375
1376 return RX_CONTINUE;
1377}
1378
49461622 1379static ieee80211_rx_result debug_noinline
5cf121c3 1380ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1381{
1382 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1383 struct sk_buff *skb = rx->skb;
1384 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1385 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1386
1387 if (!sta)
9ae54c84 1388 return RX_CONTINUE;
571ecf67 1389
b291ba11
JB		 1390 /*
1391 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1392 * BSSID and for station already AUTHORIZED to avoid keeping the
1393 * current IBSS network alive in cases where other STAs start
1394 * using different BSSID. This will also give the station another
1395 * chance to restart the authentication/authorization in case
1396 * something went wrong the first time.
b291ba11 1397 */
05c914fe 1398 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1399 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1400 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1401 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1402 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1403 sta->last_rx = jiffies;
3af6334c
FF		 1404 if (ieee80211_is_data(hdr->frame_control)) {
1405 sta->last_rx_rate_idx = status->rate_idx;
1406 sta->last_rx_rate_flag = status->flag;
5614618e 1407 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1408 }
1409 }
b291ba11
JB		 1410 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1411 /*
33b64eb2
LCC		 1412 * Mesh beacons will update last_rx when if they are found to
1413 * match the current local configuration when processed.
571ecf67 1414 */
b291ba11 1415 sta->last_rx = jiffies;
3af6334c
FF		 1416 if (ieee80211_is_data(hdr->frame_control)) {
1417 sta->last_rx_rate_idx = status->rate_idx;
1418 sta->last_rx_rate_flag = status->flag;
5614618e 1419 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1420 }
571ecf67
JB		 1421 }
1422
554891e6 1423 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1424 return RX_CONTINUE;
571ecf67 1425
3cf335d5
KV		 1426 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1427 ieee80211_sta_rx_notify(rx->sdata, hdr);
1428
571ecf67
JB		 1429 sta->rx_fragments++;
1430 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1431 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1432 sta->last_signal = status->signal;
1433 ewma_add(&sta->avg_signal, -status->signal);
1434 }
571ecf67 1435
72eaa43a
JB		 1436 /*
1437 * Change STA power saving mode only at the end of a frame
1438 * exchange sequence.
1439 */
d057e5a3
AN		 1440 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1441 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1442 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1443 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1444 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1445 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1446 /*
1447 * Ignore doze->wake transitions that are
1448 * indicated by non-data frames, the standard
1449 * is unclear here, but for example going to
1450 * PS mode and then scanning would cause a
1451 * doze->wake transition for the probe request,
1452 * and that is clearly undesirable.
1453 */
1454 if (ieee80211_is_data(hdr->frame_control) &&
1455 !ieee80211_has_pm(hdr->frame_control))
d012a605 1456 sta_ps_end(sta);
72eaa43a
JB		 1457 } else {
1458 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1459 sta_ps_start(sta);
72eaa43a 1460 }
571ecf67
JB		 1461 }
1462
3f52b7e3
MP		 1463 /* mesh power save support */
1464 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1465 ieee80211_mps_rx_h_sta_process(sta, hdr);
1466
22403def
JB		 1467 /*
1468 * Drop (qos-)data::nullfunc frames silently, since they
1469 * are used only to control station power saving mode.
1470 */
1471 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1472 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1473 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1474
1475 /*
1476 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1477 * that was not moved to a 4-addr STA vlan yet send
1478 * the event to userspace and for older hostapd drop
1479 * the frame to the monitor interface.
d524215f
FF		 1480 */
1481 if (ieee80211_has_a4(hdr->frame_control) &&
1482 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1483 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1484 !rx->sdata->u.vlan.sta))) {
1485 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1486 cfg80211_rx_unexpected_4addr_frame(
1487 rx->sdata->dev, sta->sta.addr,
1488 GFP_ATOMIC);
d524215f 1489 return RX_DROP_MONITOR;
e7f4a940 1490 }
22403def
JB		 1491 /*
1492 * Update counter and free packet here to avoid
1493 * counting this as a dropped packed.
1494 */
571ecf67
JB		 1495 sta->rx_packets++;
1496 dev_kfree_skb(rx->skb);
9ae54c84 1497 return RX_QUEUED;
571ecf67
JB		 1498 }
1499
9ae54c84 1500 return RX_CONTINUE;
571ecf67
JB		 1501} /* ieee80211_rx_h_sta_process */
1502
571ecf67
JB		 1503static inline struct ieee80211_fragment_entry *
1504ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1505 unsigned int frag, unsigned int seq, int rx_queue,
1506 struct sk_buff **skb)
1507{
1508 struct ieee80211_fragment_entry *entry;
571ecf67 1509
571ecf67
JB		 1510 entry = &sdata->fragments[sdata->fragment_next++];
1511 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1512 sdata->fragment_next = 0;
1513
bdcbd8e0 1514 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1515 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1516
1517 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1518 *skb = NULL;
1519 entry->first_frag_time = jiffies;
1520 entry->seq = seq;
1521 entry->rx_queue = rx_queue;
1522 entry->last_frag = frag;
1523 entry->ccmp = 0;
1524 entry->extra_len = 0;
1525
1526 return entry;
1527}
1528
1529static inline struct ieee80211_fragment_entry *
1530ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1531 unsigned int frag, unsigned int seq,
571ecf67
JB		 1532 int rx_queue, struct ieee80211_hdr *hdr)
1533{
1534 struct ieee80211_fragment_entry *entry;
1535 int i, idx;
1536
1537 idx = sdata->fragment_next;
1538 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1539 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1540
1541 idx--;
1542 if (idx < 0)
1543 idx = IEEE80211_FRAGMENT_MAX - 1;
1544
1545 entry = &sdata->fragments[idx];
1546 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1547 entry->rx_queue != rx_queue ||
1548 entry->last_frag + 1 != frag)
1549 continue;
1550
b73d70ad 1551 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1552
b73d70ad
HH		 1553 /*
1554 * Check ftype and addresses are equal, else check next fragment
1555 */
1556 if (((hdr->frame_control ^ f_hdr->frame_control) &
1557 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1558 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1559 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1560 continue;
1561
ab46623e 1562 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1563 __skb_queue_purge(&entry->skb_list);
1564 continue;
1565 }
1566 return entry;
1567 }
1568
1569 return NULL;
1570}
1571
49461622 1572static ieee80211_rx_result debug_noinline
5cf121c3 1573ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1574{
1575 struct ieee80211_hdr *hdr;
1576 u16 sc;
358c8d9d 1577 __le16 fc;
571ecf67
JB		 1578 unsigned int frag, seq;
1579 struct ieee80211_fragment_entry *entry;
1580 struct sk_buff *skb;
554891e6 1581 struct ieee80211_rx_status *status;
571ecf67 1582
b73d70ad 1583 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1584 fc = hdr->frame_control;
f7fbf70e
JC		 1585
1586 if (ieee80211_is_ctl(fc))
1587 return RX_CONTINUE;
1588
571ecf67
JB		 1589 sc = le16_to_cpu(hdr->seq_ctrl);
1590 frag = sc & IEEE80211_SCTL_FRAG;
1591
358c8d9d 1592 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1593 is_multicast_ether_addr(hdr->addr1))) {
1594 /* not fragmented */
1595 goto out;
1596 }
1597 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1598
e3cf8b3f
ZY		 1599 if (skb_linearize(rx->skb))
1600 return RX_DROP_UNUSABLE;
1601
058897a4
AK		 1602 /*
1603 * skb_linearize() might change the skb->data and
1604 * previously cached variables (in this case, hdr) need to
1605 * be refreshed with the new data.
1606 */
1607 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1608 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1609
1610 if (frag == 0) {
1611 /* This is the first fragment of a new frame. */
1612 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1613 rx->seqno_idx, &(rx->skb));
97359d12 1614 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1615 ieee80211_has_protected(fc)) {
9e26297a 1616 int queue = rx->security_idx;
571ecf67
JB		 1617 /* Store CCMP PN so that we can verify that the next
1618 * fragment has a sequential PN value. */
1619 entry->ccmp = 1;
1620 memcpy(entry->last_pn,
9190252c 1621 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1622 CCMP_PN_LEN);
1623 }
9ae54c84 1624 return RX_QUEUED;
571ecf67
JB		 1625 }
1626
1627 /* This is a fragment for a frame that should already be pending in
1628 * fragment cache. Add this fragment to the end of the pending entry.
1629 */
9e26297a
JB		 1630 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1631 rx->seqno_idx, hdr);
571ecf67
JB		 1632 if (!entry) {
1633 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1634 return RX_DROP_MONITOR;
571ecf67
JB		 1635 }
1636
1637 /* Verify that MPDUs within one MSDU have sequential PN values.
1638 * (IEEE 802.11i, 8.3.3.4.5) */
1639 if (entry->ccmp) {
1640 int i;
1641 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1642 int queue;
97359d12 1643 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1644 return RX_DROP_UNUSABLE;
571ecf67
JB		 1645 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1646 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1647 pn[i]++;
1648 if (pn[i])
1649 break;
1650 }
9e26297a 1651 queue = rx->security_idx;
9190252c 1652 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1653 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1654 return RX_DROP_UNUSABLE;
571ecf67
JB		 1655 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1656 }
1657
358c8d9d 1658 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1659 __skb_queue_tail(&entry->skb_list, rx->skb);
1660 entry->last_frag = frag;
1661 entry->extra_len += rx->skb->len;
358c8d9d 1662 if (ieee80211_has_morefrags(fc)) {
571ecf67 1663 rx->skb = NULL;
9ae54c84 1664 return RX_QUEUED;
571ecf67
JB		 1665 }
1666
1667 rx->skb = __skb_dequeue(&entry->skb_list);
1668 if (skb_tailroom(rx->skb) < entry->extra_len) {
1669 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1670 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1671 GFP_ATOMIC))) {
1672 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1673 __skb_queue_purge(&entry->skb_list);
e4c26add 1674 return RX_DROP_UNUSABLE;
571ecf67
JB		 1675 }
1676 }
1677 while ((skb = __skb_dequeue(&entry->skb_list))) {
1678 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1679 dev_kfree_skb(skb);
1680 }
1681
1682 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1683 status = IEEE80211_SKB_RXCB(rx->skb);
1684 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1685
1686 out:
1687 if (rx->sta)
1688 rx->sta->rx_packets++;
1689 if (is_multicast_ether_addr(hdr->addr1))
1690 rx->local->dot11MulticastReceivedFrameCount++;
1691 else
1692 ieee80211_led_rx(rx->local);
9ae54c84 1693 return RX_CONTINUE;
571ecf67
JB		 1694}
1695
1df332e8 1696static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1697{
1df332e8 1698 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1699 return -EACCES;
571ecf67 1700
76ee65bf 1701 return 0;
571ecf67
JB		 1702}
1703
1df332e8 1704static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1705{
eb9fb5b8
JB		 1706 struct sk_buff *skb = rx->skb;
1707 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1708
3017b80b 1709 /*
7848ba7d
JB		 1710 * Pass through unencrypted frames if the hardware has
1711 * decrypted them already.
3017b80b 1712 */
eb9fb5b8 1713 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1714 return 0;
571ecf67
JB		 1715
1716 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1717 if (unlikely(!ieee80211_has_protected(fc) &&
1718 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1719 ieee80211_is_data(fc) &&
b3fc9c6c 1720 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1721 return -EACCES;
bef5d1c7
JB		 1722
1723 return 0;
1724}
1725
1df332e8 1726static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1727{
1728 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1729 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1730 __le16 fc = hdr->frame_control;
bef5d1c7 1731
e3efca0a
JM		 1732 /*
1733 * Pass through unencrypted frames if the hardware has
1734 * decrypted them already.
1735 */
1736 if (status->flag & RX_FLAG_DECRYPTED)
1737 return 0;
bef5d1c7 1738
c2c98fde 1739 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1740 if (unlikely(!ieee80211_has_protected(fc) &&
1741 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1742 rx->key)) {
1743 if (ieee80211_is_deauth(fc))
1744 cfg80211_send_unprot_deauth(rx->sdata->dev,
1745 rx->skb->data,
1746 rx->skb->len);
1747 else if (ieee80211_is_disassoc(fc))
1748 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1749 rx->skb->data,
1750 rx->skb->len);
f2ca3ea4 1751 return -EACCES;
cf4e594e 1752 }
f2ca3ea4 1753 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1754 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1755 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1756 if (ieee80211_is_deauth(fc))
1757 cfg80211_send_unprot_deauth(rx->sdata->dev,
1758 rx->skb->data,
1759 rx->skb->len);
1760 else if (ieee80211_is_disassoc(fc))
1761 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1762 rx->skb->data,
1763 rx->skb->len);
f2ca3ea4 1764 return -EACCES;
cf4e594e 1765 }
f2ca3ea4
JM		 1766 /*
1767 * When using MFP, Action frames are not allowed prior to
1768 * having configured keys.
1769 */
1770 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1771 ieee80211_is_robust_mgmt_frame(
1772 (struct ieee80211_hdr *) rx->skb->data)))
1773 return -EACCES;
1774 }
b3fc9c6c 1775
76ee65bf 1776 return 0;
571ecf67
JB		 1777}
1778
76ee65bf 1779static int
4114fa21 1780__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1781{
eb9fb5b8 1782 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1784 bool check_port_control = false;
1785 struct ethhdr *ehdr;
1786 int ret;
f14543ee 1787
4114fa21 1788 *port_control = false;
9bc383de
JB		 1789 if (ieee80211_has_a4(hdr->frame_control) &&
1790 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1791 return -1;
9bc383de 1792
fbb327c5
FF		 1793 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1794 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1795
1796 if (!sdata->u.mgd.use_4addr)
1797 return -1;
1798 else
1799 check_port_control = true;
1800 }
1801
9bc383de 1802 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1803 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1804 return -1;
571ecf67 1805
fbb327c5 1806 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1807 if (ret < 0)
fbb327c5
FF		 1808 return ret;
1809
1810 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1811 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1812 *port_control = true;
1813 else if (check_port_control)
fbb327c5
FF		 1814 return -1;
1815
1816 return 0;
76ee65bf 1817}
571ecf67 1818
ce3edf6d
JB		 1819/*
1820 * requires that rx->skb is a frame with ethernet header
1821 */
358c8d9d 1822static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1823{
c97c23e3 1824 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1825 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1826 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1827
1828 /*
1829 * Allow EAPOL frames to us/the PAE group address regardless
1830 * of whether the frame was encrypted or not.
1831 */
a621fa4d 1832 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1833 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1834 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1835 return true;
1836
1837 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1838 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1839 return false;
1840
1841 return true;
1842}
1843
1844/*
1845 * requires that rx->skb is a frame with ethernet header
1846 */
76ee65bf 1847static void
5cf121c3 1848ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1849{
eb9fb5b8
JB		 1850 struct ieee80211_sub_if_data *sdata = rx->sdata;
1851 struct net_device *dev = sdata->dev;
76ee65bf 1852 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1853 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1854 struct sta_info *dsta;
554891e6 1855 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1856
76ee65bf
RR		 1857 skb = rx->skb;
1858 xmit_skb = NULL;
571ecf67 1859
05c914fe
JB		 1860 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1861 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1862 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1863 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1864 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1865 if (is_multicast_ether_addr(ehdr->h_dest)) {
1866 /*
1867 * send multicast frames both to higher layers in
1868 * local net stack and back to the wireless medium
1869 */
76ee65bf 1870 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1871 if (!xmit_skb)
bdcbd8e0 1872 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1873 dev->name);
571ecf67 1874 } else {
abe60632
JB		 1875 dsta = sta_info_get(sdata, skb->data);
1876 if (dsta) {
ce3edf6d
JB		 1877 /*
1878 * The destination station is associated to
1879 * this AP (in this VLAN), so send the frame
1880 * directly to it and do not pass it to local
1881 * net stack.
571ecf67 1882 */
76ee65bf 1883 xmit_skb = skb;
571ecf67
JB		 1884 skb = NULL;
1885 }
571ecf67
JB		 1886 }
1887 }
1888
1889 if (skb) {
d1c3a37c
JB		 1890 int align __maybe_unused;
1891
59d9cb07 1892#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1893 /*
1894 * 'align' will only take the values 0 or 2 here
1895 * since all frames are required to be aligned
1896 * to 2-byte boundaries when being passed to
1897 * mac80211. That also explains the __skb_push()
1898 * below.
1899 */
dacb6f1d 1900 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1901 if (align) {
1902 if (WARN_ON(skb_headroom(skb) < 3)) {
1903 dev_kfree_skb(skb);
1904 skb = NULL;
1905 } else {
1906 u8 *data = skb->data;
8ce0b589
ZY		 1907 size_t len = skb_headlen(skb);
1908 skb->data -= align;
1909 memmove(skb->data, data, len);
1910 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1911 }
1912 }
1913#endif
1914
1915 if (skb) {
1916 /* deliver to local stack */
1917 skb->protocol = eth_type_trans(skb, dev);
1918 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1919 netif_receive_skb(skb);
d1c3a37c 1920 }
571ecf67
JB		 1921 }
1922
76ee65bf 1923 if (xmit_skb) {
aef6c928
HS		 1924 /*
1925 * Send to wireless media and increase priority by 256 to
1926 * keep the received priority instead of reclassifying
1927 * the frame (see cfg80211_classify8021d).
1928 */
1929 xmit_skb->priority += 256;
f831e909 1930 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1931 skb_reset_network_header(xmit_skb);
1932 skb_reset_mac_header(xmit_skb);
76ee65bf 1933 dev_queue_xmit(xmit_skb);
571ecf67 1934 }
76ee65bf
RR		 1935}
1936
49461622 1937static ieee80211_rx_result debug_noinline
5cf121c3 1938ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1939{
eb9fb5b8 1940 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1941 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1942 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1943 __le16 fc = hdr->frame_control;
eaf85ca7 1944 struct sk_buff_head frame_list;
554891e6 1945 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1946
358c8d9d 1947 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1948 return RX_CONTINUE;
fd4c7f2f 1949
358c8d9d 1950 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1951 return RX_DROP_MONITOR;
fd4c7f2f 1952
554891e6 1953 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1954 return RX_CONTINUE;
fd4c7f2f 1955
eaf85ca7
ZY		 1956 if (ieee80211_has_a4(hdr->frame_control) &&
1957 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1958 !rx->sdata->u.vlan.sta)
e4c26add 1959 return RX_DROP_UNUSABLE;
fd4c7f2f 1960
eaf85ca7
ZY		 1961 if (is_multicast_ether_addr(hdr->addr1) &&
1962 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1963 rx->sdata->u.vlan.sta) ||
1964 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1965 rx->sdata->u.mgd.use_4addr)))
e4c26add 1966 return RX_DROP_UNUSABLE;
fd4c7f2f 1967
eaf85ca7
ZY		 1968 skb->dev = dev;
1969 __skb_queue_head_init(&frame_list);
fd4c7f2f 1970
e3cf8b3f
ZY		 1971 if (skb_linearize(skb))
1972 return RX_DROP_UNUSABLE;
1973
eaf85ca7
ZY		 1974 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1975 rx->sdata->vif.type,
8b3becad 1976 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1977
eaf85ca7
ZY		 1978 while (!skb_queue_empty(&frame_list)) {
1979 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1980
358c8d9d 1981 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1982 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1983 continue;
1984 }
eaf85ca7
ZY		 1985 dev->stats.rx_packets++;
1986 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1987
1988 ieee80211_deliver_skb(rx);
1989 }
1990
9ae54c84 1991 return RX_QUEUED;
fd4c7f2f
RR		 1992}
1993
bf94e17b 1994#ifdef CONFIG_MAC80211_MESH
b0dee578 1995static ieee80211_rx_result
e32f85f7
LCC		 1996ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1997{
30789eb6
TP		 1998 struct ieee80211_hdr *fwd_hdr, *hdr;
1999 struct ieee80211_tx_info *info;
e32f85f7 2000 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2001 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2002 struct ieee80211_local *local = rx->local;
eb9fb5b8 2003 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2004 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2005 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 2006 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 2007 u16 q, hdrlen;
e32f85f7
LCC		 2008
2009 hdr = (struct ieee80211_hdr *) skb->data;
2010 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2011
2012 /* make sure fixed part of mesh header is there, also checks skb len */
2013 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2014 return RX_DROP_MONITOR;
2015
2016 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2017
2018 /* make sure full mesh header is there, also checks skb len */
2019 if (!pskb_may_pull(rx->skb,
2020 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2021 return RX_DROP_MONITOR;
2022
2023 /* reload pointers */
2024 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2025 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2026
2157fdd6
TP		 2027 /* frame is in RMC, don't forward */
2028 if (ieee80211_is_data(hdr->frame_control) &&
2029 is_multicast_ether_addr(hdr->addr1) &&
2030 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
2031 return RX_DROP_MONITOR;
2032
555cb715
JC		 2033 if (!ieee80211_is_data(hdr->frame_control) ||
2034 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2035 return RX_CONTINUE;
2036
2037 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2038 return RX_DROP_MONITOR;
2039
43b7b314 2040 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2041 struct mesh_path *mppath;
43b7b314
JC		 2042 char *proxied_addr;
2043 char *mpp_addr;
2044
2045 if (is_multicast_ether_addr(hdr->addr1)) {
2046 mpp_addr = hdr->addr3;
2047 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2048 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2049 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2050 mpp_addr = hdr->addr4;
2051 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2052 } else {
2053 return RX_DROP_MONITOR;
43b7b314 2054 }
79617dee 2055
79617dee 2056 rcu_read_lock();
43b7b314 2057 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 2058 if (!mppath) {
43b7b314 2059 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 2060 } else {
2061 spin_lock_bh(&mppath->state_lock);
b203ca39 2062 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2063 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2064 spin_unlock_bh(&mppath->state_lock);
2065 }
2066 rcu_read_unlock();
2067 }
2068
3c5772a5
JC		 2069 /* Frame has reached destination. Don't forward */
2070 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2071 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2072 return RX_CONTINUE;
2073
00e96dec 2074 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2075 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2076 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2077 return RX_DROP_MONITOR;
2078 }
2079 skb_set_queue_mapping(skb, q);
e32f85f7 2080
30789eb6
TP		 2081 if (!--mesh_hdr->ttl) {
2082 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2083 goto out;
30789eb6
TP		 2084 }
2085
d665508b
CYY		 2086 if (!ifmsh->mshcfg.dot11MeshForwarding)
2087 goto out;
2088
30789eb6
TP		 2089 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2090 if (!fwd_skb) {
bdcbd8e0 2091 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2092 sdata->name);
30789eb6
TP		 2093 goto out;
2094 }
2095
2096 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2097 info = IEEE80211_SKB_CB(fwd_skb);
2098 memset(info, 0, sizeof(*info));
2099 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2100 info->control.vif = &rx->sdata->vif;
2101 info->control.jiffies = jiffies;
2102 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2103 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2104 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2105 /* update power mode indication when forwarding */
2106 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
30789eb6 2107 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
3f52b7e3 2108 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2109 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2110 } else {
2111 /* unable to resolve next hop */
2112 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1df332e8 2113 0, reason, fwd_hdr->addr2, sdata);
30789eb6 2114 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2115 kfree_skb(fwd_skb);
30789eb6 2116 return RX_DROP_MONITOR;
e32f85f7
LCC		 2117 }
2118
30789eb6
TP		 2119 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2120 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2121 out:
3c5772a5 2122 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2123 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2124 return RX_CONTINUE;
2125 else
2126 return RX_DROP_MONITOR;
2127}
bf94e17b 2128#endif
e32f85f7 2129
49461622 2130static ieee80211_rx_result debug_noinline
5cf121c3 2131ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2132{
eb9fb5b8 2133 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2134 struct ieee80211_local *local = rx->local;
eb9fb5b8 2135 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2136 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2137 __le16 fc = hdr->frame_control;
4114fa21 2138 bool port_control;
ce3edf6d 2139 int err;
76ee65bf 2140
358c8d9d 2141 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2142 return RX_CONTINUE;
76ee65bf 2143
358c8d9d 2144 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2145 return RX_DROP_MONITOR;
76ee65bf 2146
f14543ee 2147 /*
e7f4a940
JB		 2148 * Send unexpected-4addr-frame event to hostapd. For older versions,
2149 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2150 */
2151 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2152 sdata->vif.type == NL80211_IFTYPE_AP) {
2153 if (rx->sta &&
2154 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2155 cfg80211_rx_unexpected_4addr_frame(
2156 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2157 return RX_DROP_MONITOR;
e7f4a940 2158 }
f14543ee 2159
4114fa21 2160 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2161 if (unlikely(err))
e4c26add 2162 return RX_DROP_UNUSABLE;
76ee65bf 2163
358c8d9d 2164 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2165 return RX_DROP_MONITOR;
ce3edf6d 2166
4114fa21
FF		 2167 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2168 unlikely(port_control) && sdata->bss) {
2169 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2170 u.ap);
2171 dev = sdata->dev;
2172 rx->sdata = sdata;
2173 }
2174
76ee65bf
RR		 2175 rx->skb->dev = dev;
2176
2177 dev->stats.rx_packets++;
2178 dev->stats.rx_bytes += rx->skb->len;
2179
08ca944e 2180 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2181 !is_multicast_ether_addr(
2182 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2183 (!local->scanning &&
2184 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2185 mod_timer(&local->dynamic_ps_timer, jiffies +
2186 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2187 }
2188
76ee65bf 2189 ieee80211_deliver_skb(rx);
571ecf67 2190
9ae54c84 2191 return RX_QUEUED;
571ecf67
JB		 2192}
2193
49461622 2194static ieee80211_rx_result debug_noinline
f9e124fb 2195ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2196{
71364716 2197 struct sk_buff *skb = rx->skb;
a7767f95 2198 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2199 struct tid_ampdu_rx *tid_agg_rx;
2200 u16 start_seq_num;
2201 u16 tid;
2202
a7767f95 2203 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2204 return RX_CONTINUE;
71364716 2205
a7767f95 2206 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2207 struct {
2208 __le16 control, start_seq_num;
2209 } __packed bar_data;
2210
71364716 2211 if (!rx->sta)
a02ae758 2212 return RX_DROP_MONITOR;
8ae5977f
JB		 2213
2214 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2215 &bar_data, sizeof(bar_data)))
2216 return RX_DROP_MONITOR;
2217
8ae5977f 2218 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2219
2220 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2221 if (!tid_agg_rx)
a02ae758 2222 return RX_DROP_MONITOR;
71364716 2223
8ae5977f 2224 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2225
2226 /* reset session timer */
20ad19d0
JB		 2227 if (tid_agg_rx->timeout)
2228 mod_timer(&tid_agg_rx->session_timer,
2229 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2230
dd318575 2231 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2232 /* release stored frames up to start of BAR */
d3b2fb53 2233 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2234 start_seq_num, frames);
dd318575
JB		 2235 spin_unlock(&tid_agg_rx->reorder_lock);
2236
a02ae758
JB		 2237 kfree_skb(skb);
2238 return RX_QUEUED;
71364716
RR		 2239 }
2240
08daecae
JB		 2241 /*
2242 * After this point, we only want management frames,
2243 * so we can drop all remaining control frames to
2244 * cooked monitor interfaces.
2245 */
2246 return RX_DROP_MONITOR;
71364716
RR		 2247}
2248
f4f727a6
JM		 2249static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2250 struct ieee80211_mgmt *mgmt,
2251 size_t len)
fea14732
JM		 2252{
2253 struct ieee80211_local *local = sdata->local;
2254 struct sk_buff *skb;
2255 struct ieee80211_mgmt *resp;
2256
b203ca39 2257 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2258 /* Not to own unicast address */
2259 return;
2260 }
2261
b203ca39
JP		 2262 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2263 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2264 /* Not from the current AP or not associated yet. */
fea14732
JM		 2265 return;
2266 }
2267
2268 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2269 /* Too short SA Query request frame */
2270 return;
2271 }
2272
2273 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2274 if (skb == NULL)
2275 return;
2276
2277 skb_reserve(skb, local->hw.extra_tx_headroom);
2278 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2279 memset(resp, 0, 24);
2280 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2281 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2282 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2283 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2284 IEEE80211_STYPE_ACTION);
2285 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2286 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2287 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2288 memcpy(resp->u.action.u.sa_query.trans_id,
2289 mgmt->u.action.u.sa_query.trans_id,
2290 WLAN_SA_QUERY_TR_ID_LEN);
2291
62ae67be 2292 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2293}
2294
2e161f78
JB		 2295static ieee80211_rx_result debug_noinline
2296ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2297{
2298 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2299 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2300
2301 /*
2302 * From here on, look only at management frames.
2303 * Data and control frames are already handled,
2304 * and unknown (reserved) frames are useless.
2305 */
2306 if (rx->skb->len < 24)
2307 return RX_DROP_MONITOR;
2308
2309 if (!ieee80211_is_mgmt(mgmt->frame_control))
2310 return RX_DROP_MONITOR;
2311
ee971924
JB		 2312 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2313 ieee80211_is_beacon(mgmt->frame_control) &&
2314 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2315 int sig = 0;
2316
2317 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2318 sig = status->signal;
2319
ee971924
JB		 2320 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2321 rx->skb->data, rx->skb->len,
37c73b5f 2322 status->freq, sig);
ee971924
JB		 2323 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2324 }
2325
554891e6 2326 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2327 return RX_DROP_MONITOR;
2328
2329 if (ieee80211_drop_unencrypted_mgmt(rx))
2330 return RX_DROP_UNUSABLE;
2331
2332 return RX_CONTINUE;
2333}
2334
de1ede7a
JB		 2335static ieee80211_rx_result debug_noinline
2336ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2337{
2338 struct ieee80211_local *local = rx->local;
eb9fb5b8 2339 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2340 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2342 int len = rx->skb->len;
2343
2344 if (!ieee80211_is_action(mgmt->frame_control))
2345 return RX_CONTINUE;
2346
026331c4
JM		 2347 /* drop too small frames */
2348 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2349 return RX_DROP_UNUSABLE;
de1ede7a 2350
815b8092
MP		 2351 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2352 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
84040805 2353 return RX_DROP_UNUSABLE;
de1ede7a 2354
554891e6 2355 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2356 return RX_DROP_UNUSABLE;
97ebe12a 2357
de1ede7a 2358 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2359 case WLAN_CATEGORY_HT:
2360 /* reject HT action frames from stations not supporting HT */
2361 if (!rx->sta->sta.ht_cap.ht_supported)
2362 goto invalid;
2363
2364 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2365 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2366 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2367 sdata->vif.type != NL80211_IFTYPE_AP &&
2368 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2369 break;
2370
ec61cd63 2371 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2372 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2373 goto invalid;
2374
2375 switch (mgmt->u.action.u.ht_smps.action) {
2376 case WLAN_HT_ACTION_SMPS: {
2377 struct ieee80211_supported_band *sband;
2378 u8 smps;
2379
2380 /* convert to HT capability */
2381 switch (mgmt->u.action.u.ht_smps.smps_control) {
2382 case WLAN_HT_SMPS_CONTROL_DISABLED:
2383 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2384 break;
2385 case WLAN_HT_SMPS_CONTROL_STATIC:
2386 smps = WLAN_HT_CAP_SM_PS_STATIC;
2387 break;
2388 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2389 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2390 break;
2391 default:
2392 goto invalid;
2393 }
2394 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2395
2396 /* if no change do nothing */
2397 if ((rx->sta->sta.ht_cap.cap &
2398 IEEE80211_HT_CAP_SM_PS) == smps)
2399 goto handled;
2400
2401 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2402 rx->sta->sta.ht_cap.cap |= smps;
2403
2404 sband = rx->local->hw.wiphy->bands[status->band];
2405
64f68e5d
JB		 2406 rate_control_rate_update(local, sband, rx->sta,
2407 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2408 goto handled;
2409 }
ec61cd63
JB		 2410 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2411 struct ieee80211_supported_band *sband;
2412 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2413 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2414
2415 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2416 if (!(rx->sta->sta.ht_cap.cap &
2417 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2418 goto handled;
2419
e1a0c6b3
JB		 2420 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2421 new_bw = IEEE80211_STA_RX_BW_20;
2422 else
2423 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2424
e1a0c6b3 2425 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2426 goto handled;
2427
ec61cd63
JB		 2428 sband = rx->local->hw.wiphy->bands[status->band];
2429
2430 rate_control_rate_update(local, sband, rx->sta,
2431 IEEE80211_RC_BW_CHANGED);
2432 goto handled;
2433 }
1d8d3dec
JB		 2434 default:
2435 goto invalid;
2436 }
2437
0af83d3d
JB		 2438 break;
2439 case WLAN_CATEGORY_VHT:
2440 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2441 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2442 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2443 sdata->vif.type != NL80211_IFTYPE_AP &&
2444 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2445 break;
2446
2447 /* verify action code is present */
2448 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2449 goto invalid;
2450
2451 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2452 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2453 u8 opmode;
2454
2455 /* verify opmode is present */
2456 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2457 goto invalid;
2458
2459 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2460
2461 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2462 opmode, status->band,
2463 false);
0af83d3d
JB		 2464 goto handled;
2465 }
2466 default:
2467 break;
2468 }
1d8d3dec 2469 break;
de1ede7a 2470 case WLAN_CATEGORY_BACK:
8abd3f9b 2471 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2472 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2473 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2474 sdata->vif.type != NL80211_IFTYPE_AP &&
2475 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2476 break;
8abd3f9b 2477
026331c4
JM		 2478 /* verify action_code is present */
2479 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2480 break;
2481
de1ede7a
JB		 2482 switch (mgmt->u.action.u.addba_req.action_code) {
2483 case WLAN_ACTION_ADDBA_REQ:
2484 if (len < (IEEE80211_MIN_ACTION_SIZE +
2485 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2486 goto invalid;
2487 break;
de1ede7a
JB		 2488 case WLAN_ACTION_ADDBA_RESP:
2489 if (len < (IEEE80211_MIN_ACTION_SIZE +
2490 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2491 goto invalid;
2492 break;
de1ede7a
JB		 2493 case WLAN_ACTION_DELBA:
2494 if (len < (IEEE80211_MIN_ACTION_SIZE +
2495 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2496 goto invalid;
2497 break;
2498 default:
2499 goto invalid;
de1ede7a 2500 }
bed7ee6e 2501
8b58ff83 2502 goto queue;
39192c0b 2503 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2504 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2505 break;
46900298
JB		 2506
2507 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2508 break;
46900298 2509
026331c4
JM		 2510 /* verify action_code is present */
2511 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2512 break;
2513
39192c0b
JB		 2514 switch (mgmt->u.action.u.measurement.action_code) {
2515 case WLAN_ACTION_SPCT_MSR_REQ:
2516 if (len < (IEEE80211_MIN_ACTION_SIZE +
2517 sizeof(mgmt->u.action.u.measurement)))
84040805 2518 break;
39192c0b 2519 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2520 goto handled;
c481ec97
S		 2521 case WLAN_ACTION_SPCT_CHL_SWITCH:
2522 if (len < (IEEE80211_MIN_ACTION_SIZE +
2523 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2524 break;
c481ec97 2525
cc32abd4 2526 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2527 break;
cc32abd4 2528
b203ca39 2529 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2530 break;
c481ec97 2531
8b58ff83 2532 goto queue;
39192c0b
JB		 2533 }
2534 break;
fea14732
JM		 2535 case WLAN_CATEGORY_SA_QUERY:
2536 if (len < (IEEE80211_MIN_ACTION_SIZE +
2537 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2538 break;
2539
fea14732
JM		 2540 switch (mgmt->u.action.u.sa_query.action) {
2541 case WLAN_ACTION_SA_QUERY_REQUEST:
2542 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2543 break;
fea14732 2544 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2545 goto handled;
fea14732
JM		 2546 }
2547 break;
8db09850 2548 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2549 if (len < (IEEE80211_MIN_ACTION_SIZE +
2550 sizeof(mgmt->u.action.u.self_prot.action_code)))
2551 break;
2552
8db09850
TP		 2553 switch (mgmt->u.action.u.self_prot.action_code) {
2554 case WLAN_SP_MESH_PEERING_OPEN:
2555 case WLAN_SP_MESH_PEERING_CLOSE:
2556 case WLAN_SP_MESH_PEERING_CONFIRM:
2557 if (!ieee80211_vif_is_mesh(&sdata->vif))
2558 goto invalid;
2559 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2560 /* userspace handles this frame */
2561 break;
2562 goto queue;
2563 case WLAN_SP_MGK_INFORM:
2564 case WLAN_SP_MGK_ACK:
2565 if (!ieee80211_vif_is_mesh(&sdata->vif))
2566 goto invalid;
2567 break;
2568 }
2569 break;
d3aaec8a 2570 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2571 if (len < (IEEE80211_MIN_ACTION_SIZE +
2572 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2573 break;
2574
77a121c3
JB		 2575 if (!ieee80211_vif_is_mesh(&sdata->vif))
2576 break;
25d49e4d 2577 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2578 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2579 break;
2580 goto queue;
84040805 2581 }
026331c4 2582
2e161f78
JB		 2583 return RX_CONTINUE;
2584
bed7ee6e 2585 invalid:
554891e6 2586 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2587 /* will return in the next handlers */
2588 return RX_CONTINUE;
2589
2590 handled:
2591 if (rx->sta)
2592 rx->sta->rx_packets++;
2593 dev_kfree_skb(rx->skb);
2594 return RX_QUEUED;
2595
2596 queue:
2597 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2598 skb_queue_tail(&sdata->skb_queue, rx->skb);
2599 ieee80211_queue_work(&local->hw, &sdata->work);
2600 if (rx->sta)
2601 rx->sta->rx_packets++;
2602 return RX_QUEUED;
2603}
2604
2605static ieee80211_rx_result debug_noinline
2606ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2607{
554891e6 2608 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2609 int sig = 0;
2e161f78
JB		 2610
2611 /* skip known-bad action frames and return them in the next handler */
554891e6 2612 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2613 return RX_CONTINUE;
d7907448 2614
026331c4
JM		 2615 /*
2616 * Getting here means the kernel doesn't know how to handle
2617 * it, but maybe userspace does ... include returned frames
2618 * so userspace can register for those to know whether ones
2619 * it transmitted were processed or returned.
2620 */
026331c4 2621
804483e9
JB		 2622 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2623 sig = status->signal;
2624
71bbc994 2625 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2626 rx->skb->data, rx->skb->len,
2627 GFP_ATOMIC)) {
2628 if (rx->sta)
2629 rx->sta->rx_packets++;
2630 dev_kfree_skb(rx->skb);
2631 return RX_QUEUED;
2632 }
2633
2e161f78
JB		 2634 return RX_CONTINUE;
2635}
2636
2637static ieee80211_rx_result debug_noinline
2638ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2639{
2640 struct ieee80211_local *local = rx->local;
2641 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2642 struct sk_buff *nskb;
2643 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2644 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2645
2646 if (!ieee80211_is_action(mgmt->frame_control))
2647 return RX_CONTINUE;
2648
2649 /*
2650 * For AP mode, hostapd is responsible for handling any action
2651 * frames that we didn't handle, including returning unknown
2652 * ones. For all other modes we will return them to the sender,
2653 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2654 * 802.11-2012 9.24.4.
2e161f78
JB		 2655 * Newer versions of hostapd shall also use the management frame
2656 * registration mechanisms, but older ones still use cooked
2657 * monitor interfaces so push all frames there.
2658 */
554891e6 2659 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2660 (sdata->vif.type == NL80211_IFTYPE_AP ||
2661 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2662 return RX_DROP_MONITOR;
026331c4 2663
4b5ebccc
JB		 2664 if (is_multicast_ether_addr(mgmt->da))
2665 return RX_DROP_MONITOR;
2666
84040805
JB		 2667 /* do not return rejected action frames */
2668 if (mgmt->u.action.category & 0x80)
2669 return RX_DROP_UNUSABLE;
2670
2671 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2672 GFP_ATOMIC);
2673 if (nskb) {
292b4df6 2674 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2675
292b4df6
JL		 2676 nmgmt->u.action.category |= 0x80;
2677 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2678 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2679
2680 memset(nskb->cb, 0, sizeof(nskb->cb));
2681
2682 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2683 }
39192c0b
JB		 2684 dev_kfree_skb(rx->skb);
2685 return RX_QUEUED;
de1ede7a
JB		 2686}
2687
49461622 2688static ieee80211_rx_result debug_noinline
5cf121c3 2689ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2690{
eb9fb5b8 2691 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2692 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2693 __le16 stype;
571ecf67 2694
77a121c3 2695 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2696
77a121c3
JB		 2697 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2698 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2699 sdata->vif.type != NL80211_IFTYPE_STATION)
2700 return RX_DROP_MONITOR;
472dbc45 2701
77a121c3 2702 switch (stype) {
66e67e41 2703 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2704 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2705 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2706 /* process for all: mesh, mlme, ibss */
2707 break;
66e67e41
JB		 2708 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2709 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2710 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2711 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2712 if (is_multicast_ether_addr(mgmt->da) &&
2713 !is_broadcast_ether_addr(mgmt->da))
2714 return RX_DROP_MONITOR;
2715
77a121c3
JB		 2716 /* process only for station */
2717 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2718 return RX_DROP_MONITOR;
2719 break;
2720 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2721 /* process only for ibss */
2722 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2723 return RX_DROP_MONITOR;
2724 break;
2725 default:
2726 return RX_DROP_MONITOR;
2727 }
f9d540ee 2728
77a121c3 2729 /* queue up frame and kick off work to process it */
c1475ca9 2730 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2731 skb_queue_tail(&sdata->skb_queue, rx->skb);
2732 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2733 if (rx->sta)
2734 rx->sta->rx_packets++;
46900298 2735
77a121c3 2736 return RX_QUEUED;
571ecf67
JB		 2737}
2738
5cf121c3 2739/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2740static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2741 struct ieee80211_rate *rate)
3d30d949
MW		 2742{
2743 struct ieee80211_sub_if_data *sdata;
2744 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2745 struct sk_buff *skb = rx->skb, *skb2;
2746 struct net_device *prev_dev = NULL;
eb9fb5b8 2747 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2748 int needed_headroom;
3d30d949 2749
554891e6
JB		 2750 /*
2751 * If cooked monitor has been processed already, then
2752 * don't do it again. If not, set the flag.
2753 */
2754 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2755 goto out_free_skb;
554891e6 2756 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2757
152c477a
JB		 2758 /* If there are no cooked monitor interfaces, just free the SKB */
2759 if (!local->cooked_mntrs)
2760 goto out_free_skb;
2761
293702a3 2762 /* room for the radiotap header based on driver features */
90b9e446 2763 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2764
293702a3
JB		 2765 if (skb_headroom(skb) < needed_headroom &&
2766 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2767 goto out_free_skb;
3d30d949 2768
293702a3 2769 /* prepend radiotap information */
973ef21a
FF		 2770 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2771 false);
3d30d949
MW		 2772
2773 skb_set_mac_header(skb, 0);
2774 skb->ip_summed = CHECKSUM_UNNECESSARY;
2775 skb->pkt_type = PACKET_OTHERHOST;
2776 skb->protocol = htons(ETH_P_802_2);
2777
2778 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2779 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2780 continue;
2781
05c914fe 2782 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2783 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2784 continue;
2785
2786 if (prev_dev) {
2787 skb2 = skb_clone(skb, GFP_ATOMIC);
2788 if (skb2) {
2789 skb2->dev = prev_dev;
5548a8a1 2790 netif_receive_skb(skb2);
3d30d949
MW		 2791 }
2792 }
2793
2794 prev_dev = sdata->dev;
2795 sdata->dev->stats.rx_packets++;
2796 sdata->dev->stats.rx_bytes += skb->len;
2797 }
2798
2799 if (prev_dev) {
2800 skb->dev = prev_dev;
5548a8a1 2801 netif_receive_skb(skb);
554891e6
JB		 2802 return;
2803 }
3d30d949
MW		 2804
2805 out_free_skb:
2806 dev_kfree_skb(skb);
2807}
2808
aa0c8636
CL		 2809static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2810 ieee80211_rx_result res)
2811{
2812 switch (res) {
2813 case RX_DROP_MONITOR:
2814 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2815 if (rx->sta)
2816 rx->sta->rx_dropped++;
2817 /* fall through */
2818 case RX_CONTINUE: {
2819 struct ieee80211_rate *rate = NULL;
2820 struct ieee80211_supported_band *sband;
2821 struct ieee80211_rx_status *status;
2822
2823 status = IEEE80211_SKB_RXCB((rx->skb));
2824
2825 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2826 if (!(status->flag & RX_FLAG_HT) &&
2827 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2828 rate = &sband->bitrates[status->rate_idx];
2829
2830 ieee80211_rx_cooked_monitor(rx, rate);
2831 break;
2832 }
2833 case RX_DROP_UNUSABLE:
2834 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2835 if (rx->sta)
2836 rx->sta->rx_dropped++;
2837 dev_kfree_skb(rx->skb);
2838 break;
2839 case RX_QUEUED:
2840 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2841 break;
2842 }
2843}
571ecf67 2844
f9e124fb
CL		 2845static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2846 struct sk_buff_head *frames)
58905290 2847{
58905290 2848 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2849 struct sk_buff *skb;
8944b79f 2850
e32f85f7
LCC		 2851#define CALL_RXH(rxh) \
2852 do { \
2853 res = rxh(rx); \
2854 if (res != RX_CONTINUE) \
2569a826 2855 goto rxh_next; \
e32f85f7 2856 } while (0);
49461622 2857
f9e124fb 2858 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 2859
f9e124fb 2860 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2861 /*
2862 * all the other fields are valid across frames
2863 * that belong to an aMPDU since they are on the
2864 * same TID from the same station
2865 */
2866 rx->skb = skb;
2867
2868 CALL_RXH(ieee80211_rx_h_decrypt)
2869 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2870 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2871 CALL_RXH(ieee80211_rx_h_sta_process)
2872 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2873 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2874 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2875#ifdef CONFIG_MAC80211_MESH
aa0c8636 2876 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2877 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2878#endif
2154c81c 2879 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2880 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 2881
2882 /* special treatment -- needs the queue */
2883 res = ieee80211_rx_h_ctrl(rx, frames);
2884 if (res != RX_CONTINUE)
2885 goto rxh_next;
2886
2e161f78 2887 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2888 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2889 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2890 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2891 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2892
aa0c8636
CL		 2893 rxh_next:
2894 ieee80211_rx_handlers_result(rx, res);
f9e124fb 2895
49461622 2896#undef CALL_RXH
aa0c8636 2897 }
24a8fdad 2898
f9e124fb 2899 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 2900}
2901
4406c376 2902static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2903{
f9e124fb 2904 struct sk_buff_head reorder_release;
aa0c8636
CL		 2905 ieee80211_rx_result res = RX_DROP_MONITOR;
2906
f9e124fb
CL		 2907 __skb_queue_head_init(&reorder_release);
2908
aa0c8636
CL		 2909#define CALL_RXH(rxh) \
2910 do { \
2911 res = rxh(rx); \
2912 if (res != RX_CONTINUE) \
2913 goto rxh_next; \
2914 } while (0);
2915
aa0c8636
CL		 2916 CALL_RXH(ieee80211_rx_h_check)
2917
f9e124fb 2918 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 2919
f9e124fb 2920 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 2921 return;
49461622 2922
2569a826 2923 rxh_next:
aa0c8636
CL		 2924 ieee80211_rx_handlers_result(rx, res);
2925
2926#undef CALL_RXH
58905290
JB		 2927}
2928
2bff8ebf 2929/*
dd318575
JB		 2930 * This function makes calls into the RX path, therefore
2931 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2932 */
2933void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2934{
f9e124fb 2935 struct sk_buff_head frames;
554891e6
JB		 2936 struct ieee80211_rx_data rx = {
2937 .sta = sta,
2938 .sdata = sta->sdata,
2939 .local = sta->local,
9e26297a
JB		 2940 /* This is OK -- must be QoS data frame */
2941 .security_idx = tid,
2942 .seqno_idx = tid,
fcf8bd3b 2943 .flags = 0,
554891e6 2944 };
2c15a0cf
CL		 2945 struct tid_ampdu_rx *tid_agg_rx;
2946
2947 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2948 if (!tid_agg_rx)
2949 return;
2bff8ebf 2950
f9e124fb
CL		 2951 __skb_queue_head_init(&frames);
2952
2c15a0cf 2953 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 2954 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 2955 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2956
f9e124fb 2957 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 2958}
2959
571ecf67
JB		 2960/* main receive path */
2961
20b01f80 2962static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2963 struct ieee80211_hdr *hdr)
2964{
20b01f80 2965 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2966 struct sk_buff *skb = rx->skb;
2967 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2968 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2969 int multicast = is_multicast_ether_addr(hdr->addr1);
2970
51fb61e7 2971 switch (sdata->vif.type) {
05c914fe 2972 case NL80211_IFTYPE_STATION:
9bc383de 2973 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2974 return 0;
77fdaa12 2975 if (!multicast &&
b203ca39 2976 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2977 if (!(sdata->dev->flags & IFF_PROMISC) ||
2978 sdata->u.mgd.use_4addr)
23a24def 2979 return 0;
554891e6 2980 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2981 }
2982 break;
05c914fe 2983 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2984 if (!bssid)
2985 return 0;
a7767f95 2986 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2987 return 1;
d48b2968
JB		 2988 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2989 return 0;
23a24def 2990 } else if (!multicast &&
b203ca39 2991 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2992 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2993 return 0;
554891e6 2994 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2995 } else if (!rx->sta) {
2996 int rate_idx;
5614618e
JB		 2997 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
2998 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 2999 else
eb9fb5b8 3000 rate_idx = status->rate_idx;
8bf11d8d
JB		 3001 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3002 BIT(rate_idx));
0fb8ca45 3003 }
23a24def 3004 break;
05c914fe 3005 case NL80211_IFTYPE_MESH_POINT:
6032f934 3006 if (!multicast &&
b203ca39 3007 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 3008 if (!(sdata->dev->flags & IFF_PROMISC))
3009 return 0;
3010
554891e6 3011 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3012 }
3013 break;
05c914fe
JB		 3014 case NL80211_IFTYPE_AP_VLAN:
3015 case NL80211_IFTYPE_AP:
23a24def 3016 if (!bssid) {
b203ca39 3017 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 3018 return 0;
f142c6b9 3019 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3020 /*
3021 * Accept public action frames even when the
3022 * BSSID doesn't match, this is used for P2P
3023 * and location updates. Note that mac80211
3024 * itself never looks at these frames.
3025 */
d48b2968 3026 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 3027 return 1;
d48b2968 3028 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 3029 return 0;
554891e6 3030 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 3031 }
23a24def 3032 break;
05c914fe 3033 case NL80211_IFTYPE_WDS:
a7767f95 3034 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 3035 return 0;
b203ca39 3036 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 3037 return 0;
3038 break;
f142c6b9
JB		 3039 case NL80211_IFTYPE_P2P_DEVICE:
3040 if (!ieee80211_is_public_action(hdr, skb->len) &&
3041 !ieee80211_is_probe_req(hdr->frame_control) &&
3042 !ieee80211_is_probe_resp(hdr->frame_control) &&
3043 !ieee80211_is_beacon(hdr->frame_control))
3044 return 0;
3045 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
3046 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3047 break;
2ca27bcf 3048 default:
fb1c1cd6 3049 /* should never get here */
f142c6b9 3050 WARN_ON_ONCE(1);
fb1c1cd6 3051 break;
23a24def
JB		 3052 }
3053
3054 return 1;
3055}
3056
4406c376
JB		 3057/*
3058 * This function returns whether or not the SKB
3059 * was destined for RX processing or not, which,
3060 * if consume is true, is equivalent to whether
3061 * or not the skb was consumed.
3062 */
3063static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3064 struct sk_buff *skb, bool consume)
3065{
3066 struct ieee80211_local *local = rx->local;
3067 struct ieee80211_sub_if_data *sdata = rx->sdata;
3068 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3069 struct ieee80211_hdr *hdr = (void *)skb->data;
3070 int prepares;
3071
3072 rx->skb = skb;
554891e6 3073 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 3074 prepares = prepare_for_handlers(rx, hdr);
3075
3076 if (!prepares)
3077 return false;
3078
4406c376
JB		 3079 if (!consume) {
3080 skb = skb_copy(skb, GFP_ATOMIC);
3081 if (!skb) {
3082 if (net_ratelimit())
3083 wiphy_debug(local->hw.wiphy,
b305dae4 3084 "failed to copy skb for %s\n",
4406c376
JB		 3085 sdata->name);
3086 return true;
3087 }
3088
3089 rx->skb = skb;
3090 }
3091
3092 ieee80211_invoke_rx_handlers(rx);
3093 return true;
3094}
3095
571ecf67 3096/*
6368e4b1
RR		 3097 * This is the actual Rx frames handler. as it blongs to Rx path it must
3098 * be called with rcu_read_lock protection.
571ecf67 3099 */
71ebb4aa 3100static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3101 struct sk_buff *skb)
571ecf67
JB		 3102{
3103 struct ieee80211_local *local = hw_to_local(hw);
3104 struct ieee80211_sub_if_data *sdata;
571ecf67 3105 struct ieee80211_hdr *hdr;
e3cf8b3f 3106 __le16 fc;
5cf121c3 3107 struct ieee80211_rx_data rx;
4406c376 3108 struct ieee80211_sub_if_data *prev;
56af3268 3109 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3110 int err = 0;
571ecf67 3111
e3cf8b3f 3112 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3113 memset(&rx, 0, sizeof(rx));
3114 rx.skb = skb;
3115 rx.local = local;
72abd81b 3116
e3cf8b3f 3117 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3118 local->dot11ReceivedFragmentCount++;
571ecf67 3119
4a4f1a58
JB		 3120 if (ieee80211_is_mgmt(fc)) {
3121 /* drop frame if too short for header */
3122 if (skb->len < ieee80211_hdrlen(fc))
3123 err = -ENOBUFS;
3124 else
3125 err = skb_linearize(skb);
3126 } else {
e3cf8b3f 3127 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3128 }
e3cf8b3f
ZY		 3129
3130 if (err) {
3131 dev_kfree_skb(skb);
3132 return;
3133 }
3134
3135 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3136 ieee80211_parse_qos(&rx);
d1c3a37c 3137 ieee80211_verify_alignment(&rx);
38f3714d 3138
d48b2968
JB		 3139 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3140 ieee80211_is_beacon(hdr->frame_control)))
3141 ieee80211_scan_rx(local, skb);
3142
e3cf8b3f 3143 if (ieee80211_is_data(fc)) {
56af3268 3144 prev_sta = NULL;
4406c376 3145
7852e361 3146 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3147 if (!prev_sta) {
3148 prev_sta = sta;
3149 continue;
3150 }
3151
3152 rx.sta = prev_sta;
3153 rx.sdata = prev_sta->sdata;
4406c376 3154 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3155
56af3268 3156 prev_sta = sta;
4406c376 3157 }
56af3268
BG		 3158
3159 if (prev_sta) {
3160 rx.sta = prev_sta;
3161 rx.sdata = prev_sta->sdata;
3162
4406c376 3163 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3164 return;
8e26d5ad 3165 goto out;
56af3268 3166 }
4406c376
JB		 3167 }
3168
4b0dd98e 3169 prev = NULL;
b2e7771e 3170
4b0dd98e
JB		 3171 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3172 if (!ieee80211_sdata_running(sdata))
3173 continue;
340e11f3 3174
4b0dd98e
JB		 3175 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3176 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3177 continue;
340e11f3 3178
4b0dd98e
JB		 3179 /*
3180 * frame is destined for this interface, but if it's
3181 * not also for the previous one we handle that after
3182 * the loop to avoid copying the SKB once too much
3183 */
4bb29f8c 3184
4b0dd98e 3185 if (!prev) {
abe60632 3186 prev = sdata;
4b0dd98e 3187 continue;
340e11f3 3188 }
4bb29f8c 3189
7852e361 3190 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3191 rx.sdata = prev;
3192 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3193
4b0dd98e
JB		 3194 prev = sdata;
3195 }
3196
3197 if (prev) {
7852e361 3198 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3199 rx.sdata = prev;
4406c376 3200
4b0dd98e
JB		 3201 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3202 return;
571ecf67 3203 }
4406c376 3204
8e26d5ad 3205 out:
4406c376 3206 dev_kfree_skb(skb);
571ecf67 3207}
6368e4b1
RR		 3208
3209/*
3210 * This is the receive path handler. It is called by a low level driver when an
3211 * 802.11 MPDU is received from the hardware.
3212 */
103bf9f7 3213void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3214{
3215 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3216 struct ieee80211_rate *rate = NULL;
3217 struct ieee80211_supported_band *sband;
f1d58c25 3218 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3219
d20ef63d
JB		 3220 WARN_ON_ONCE(softirq_count() == 0);
3221
444e3803 3222 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3223 goto drop;
8318d78a
JB		 3224
3225 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3226 if (WARN_ON(!sband))
3227 goto drop;
8318d78a 3228
89c3a8ac
JB		 3229 /*
3230 * If we're suspending, it is possible although not too likely
3231 * that we'd be receiving frames after having already partially
3232 * quiesced the stack. We can't process such frames then since
3233 * that might, for example, cause stations to be added or other
3234 * driver callbacks be invoked.
3235 */
77a980dc
JB		 3236 if (unlikely(local->quiescing || local->suspended))
3237 goto drop;
89c3a8ac 3238
04800ada
AN		 3239 /* We might be during a HW reconfig, prevent Rx for the same reason */
3240 if (unlikely(local->in_reconfig))
3241 goto drop;
3242
ea77f12f
JB		 3243 /*
3244 * The same happens when we're not even started,
3245 * but that's worth a warning.
3246 */
77a980dc
JB		 3247 if (WARN_ON(!local->started))
3248 goto drop;
ea77f12f 3249
fc885189 3250 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3251 /*
fc885189
JB		 3252 * Validate the rate, unless a PLCP error means that
3253 * we probably can't have a valid rate here anyway.
e5d6eb83 3254 */
fc885189
JB		 3255
3256 if (status->flag & RX_FLAG_HT) {
3257 /*
3258 * rate_idx is MCS index, which can be [0-76]
3259 * as documented on:
3260 *
3261 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3262 *
3263 * Anything else would be some sort of driver or
3264 * hardware error. The driver should catch hardware
3265 * errors.
3266 */
444e3803 3267 if (WARN(status->rate_idx > 76,
fc885189
JB		 3268 "Rate marked as an HT rate but passed "
3269 "status->rate_idx is not "
3270 "an MCS index [0-76]: %d (0x%02x)\n",
3271 status->rate_idx,
3272 status->rate_idx))
3273 goto drop;
5614618e
JB		 3274 } else if (status->flag & RX_FLAG_VHT) {
3275 if (WARN_ONCE(status->rate_idx > 9 ||
3276 !status->vht_nss ||
3277 status->vht_nss > 8,
3278 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3279 status->rate_idx, status->vht_nss))
3280 goto drop;
fc885189 3281 } else {
444e3803 3282 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3283 goto drop;
3284 rate = &sband->bitrates[status->rate_idx];
3285 }
0fb8ca45 3286 }
6368e4b1 3287
554891e6
JB		 3288 status->rx_flags = 0;
3289
6368e4b1
RR		 3290 /*
3291 * key references and virtual interfaces are protected using RCU
3292 * and this requires that we are in a read-side RCU section during
3293 * receive processing
3294 */
3295 rcu_read_lock();
3296
3297 /*
3298 * Frames with failed FCS/PLCP checksum are not returned,
3299 * all other frames are returned without radiotap header
3300 * if it was previously present.
3301 * Also, frames with less than 16 bytes are dropped.
3302 */
f1d58c25 3303 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3304 if (!skb) {
3305 rcu_read_unlock();
3306 return;
3307 }
3308
e1e54068
JB		 3309 ieee80211_tpt_led_trig_rx(local,
3310 ((struct ieee80211_hdr *)skb->data)->frame_control,
3311 skb->len);
071d9ac2 3312 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3313
3314 rcu_read_unlock();
77a980dc
JB		 3315
3316 return;
3317 drop:
3318 kfree_skb(skb);
6368e4b1 3319}
103bf9f7 3320EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3321
3322/* This is a version of the rx handler that can be called from hard irq
3323 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3324void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3325{
3326 struct ieee80211_local *local = hw_to_local(hw);
3327
3328 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3329
571ecf67
JB		 3330 skb->pkt_type = IEEE80211_RX_MSG;
3331 skb_queue_tail(&local->skb_queue, skb);
3332 tasklet_schedule(&local->tasklet);
3333}
3334EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)