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Merge tag 'v3.10.105' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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
d3b2fb53 651static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 652 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 653 int index,
654 struct sk_buff_head *frames)
1edfb1af 655{
1edfb1af 656 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 657 struct ieee80211_rx_status *status;
1edfb1af 658
dd318575
JB		 659 lockdep_assert_held(&tid_agg_rx->reorder_lock);
660
1edfb1af
JB		 661 if (!skb)
662 goto no_frame;
663
071d9ac2 664 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 665 tid_agg_rx->stored_mpdu_num--;
666 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 667 status = IEEE80211_SKB_RXCB(skb);
668 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
f9e124fb 669 __skb_queue_tail(frames, skb);
1edfb1af
JB		 670
671no_frame:
9a886586 672 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
1edfb1af
JB		 673}
674
d3b2fb53 675static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 676 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 677 u16 head_seq_num,
678 struct sk_buff_head *frames)
1edfb1af
JB		 679{
680 int index;
681
dd318575
JB		 682 lockdep_assert_held(&tid_agg_rx->reorder_lock);
683
9a886586
JB		 684 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
685 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
686 tid_agg_rx->ssn) %
1edfb1af 687 tid_agg_rx->buf_size;
f9e124fb
CL		 688 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
689 frames);
1edfb1af
JB		 690 }
691}
692
693/*
694 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
695 * the skb was added to the buffer longer than this time ago, the earlier
696 * frames that have not yet been received are assumed to be lost and the skb
697 * can be released for processing. This may also release other skb's from the
698 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 699 *
700 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 701 */
702#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
703
d3b2fb53 704static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
f9e124fb
CL		 705 struct tid_ampdu_rx *tid_agg_rx,
706 struct sk_buff_head *frames)
aa0c8636 707{
2bff8ebf 708 int index, j;
aa0c8636 709
dd318575
JB		 710 lockdep_assert_held(&tid_agg_rx->reorder_lock);
711
aa0c8636 712 /* release the buffer until next missing frame */
9a886586
JB		 713 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
714 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
aa0c8636 715 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 716 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 717 /*
718 * No buffers ready to be released, but check whether any
719 * frames in the reorder buffer have timed out.
720 */
aa0c8636
CL		 721 int skipped = 1;
722 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
723 j = (j + 1) % tid_agg_rx->buf_size) {
724 if (!tid_agg_rx->reorder_buf[j]) {
725 skipped++;
726 continue;
727 }
499fe9a4
DH		 728 if (skipped &&
729 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 730 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 731 goto set_release_timer;
aa0c8636 732
bdcbd8e0
JB		 733 ht_dbg_ratelimited(sdata,
734 "release an RX reorder frame due to timeout on earlier frames\n");
f9e124fb
CL		 735 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
736 frames);
aa0c8636
CL		 737
738 /*
739 * Increment the head seq# also for the skipped slots.
740 */
741 tid_agg_rx->head_seq_num =
9a886586
JB		 742 (tid_agg_rx->head_seq_num +
743 skipped) & IEEE80211_SN_MASK;
aa0c8636
CL		 744 skipped = 0;
745 }
746 } else while (tid_agg_rx->reorder_buf[index]) {
f9e124fb
CL		 747 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
748 frames);
9a886586
JB		 749 index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
750 tid_agg_rx->ssn) %
aa0c8636
CL		 751 tid_agg_rx->buf_size;
752 }
2bff8ebf
CL		 753
754 if (tid_agg_rx->stored_mpdu_num) {
9a886586
JB		 755 j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num,
756 tid_agg_rx->ssn) %
757 tid_agg_rx->buf_size;
2bff8ebf
CL		 758
759 for (; j != (index - 1) % tid_agg_rx->buf_size;
760 j = (j + 1) % tid_agg_rx->buf_size) {
761 if (tid_agg_rx->reorder_buf[j])
762 break;
763 }
764
765 set_release_timer:
766
767 mod_timer(&tid_agg_rx->reorder_timer,
334df731 768 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 769 HT_RX_REORDER_BUF_TIMEOUT);
770 } else {
771 del_timer(&tid_agg_rx->reorder_timer);
772 }
aa0c8636
CL		 773}
774
1edfb1af
JB		 775/*
776 * As this function belongs to the RX path it must be under
777 * rcu_read_lock protection. It returns false if the frame
778 * can be processed immediately, true if it was consumed.
779 */
d3b2fb53 780static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 781 struct tid_ampdu_rx *tid_agg_rx,
f9e124fb
CL		 782 struct sk_buff *skb,
783 struct sk_buff_head *frames)
1edfb1af
JB		 784{
785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
786 u16 sc = le16_to_cpu(hdr->seq_ctrl);
787 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
788 u16 head_seq_num, buf_size;
789 int index;
2bff8ebf 790 bool ret = true;
1edfb1af 791
dd318575
JB		 792 spin_lock(&tid_agg_rx->reorder_lock);
793
1edfb1af
JB		 794 buf_size = tid_agg_rx->buf_size;
795 head_seq_num = tid_agg_rx->head_seq_num;
796
797 /* frame with out of date sequence number */
9a886586 798 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
1edfb1af 799 dev_kfree_skb(skb);
2bff8ebf 800 goto out;
1edfb1af
JB		 801 }
802
803 /*
804 * If frame the sequence number exceeds our buffering window
805 * size release some previous frames to make room for this one.
806 */
9a886586
JB		 807 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
808 head_seq_num = ieee80211_sn_inc(
809 ieee80211_sn_sub(mpdu_seq_num, buf_size));
1edfb1af 810 /* release stored frames up to new head to stack */
d3b2fb53 811 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
f9e124fb 812 head_seq_num, frames);
1edfb1af
JB		 813 }
814
815 /* Now the new frame is always in the range of the reordering buffer */
816
9a886586
JB		 817 index = ieee80211_sn_sub(mpdu_seq_num,
818 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
1edfb1af
JB		 819
820 /* check if we already stored this frame */
821 if (tid_agg_rx->reorder_buf[index]) {
822 dev_kfree_skb(skb);
2bff8ebf 823 goto out;
1edfb1af
JB		 824 }
825
826 /*
827 * If the current MPDU is in the right order and nothing else
828 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 829 * If it is first but there's something stored, we may be able
830 * to release frames after this one.
1edfb1af
JB		 831 */
832 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
833 tid_agg_rx->stored_mpdu_num == 0) {
9a886586
JB		 834 tid_agg_rx->head_seq_num =
835 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 836 ret = false;
837 goto out;
1edfb1af
JB		 838 }
839
840 /* put the frame in the reordering buffer */
841 tid_agg_rx->reorder_buf[index] = skb;
842 tid_agg_rx->reorder_time[index] = jiffies;
843 tid_agg_rx->stored_mpdu_num++;
f9e124fb 844 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1edfb1af 845
2bff8ebf
CL		 846 out:
847 spin_unlock(&tid_agg_rx->reorder_lock);
848 return ret;
1edfb1af
JB		 849}
850
851/*
852 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
853 * true if the MPDU was buffered, false if it should be processed.
854 */
f9e124fb
CL		 855static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
856 struct sk_buff_head *frames)
1edfb1af 857{
2569a826
JB		 858 struct sk_buff *skb = rx->skb;
859 struct ieee80211_local *local = rx->local;
1edfb1af 860 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 861 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 862 struct sta_info *sta = rx->sta;
1edfb1af
JB		 863 struct tid_ampdu_rx *tid_agg_rx;
864 u16 sc;
6cc00d54 865 u8 tid, ack_policy;
1edfb1af 866
42beb204
JB		 867 if (!ieee80211_is_data_qos(hdr->frame_control) ||
868 is_multicast_ether_addr(hdr->addr1))
2569a826 869 goto dont_reorder;
1edfb1af
JB		 870
871 /*
872 * filter the QoS data rx stream according to
873 * STA/TID and check if this STA/TID is on aggregation
874 */
875
1edfb1af 876 if (!sta)
2569a826 877 goto dont_reorder;
1edfb1af 878
6cc00d54
TP		 879 ack_policy = *ieee80211_get_qos_ctl(hdr) &
880 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 881 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
882
a87f736d
JB		 883 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
884 if (!tid_agg_rx)
885 goto dont_reorder;
1edfb1af
JB		 886
887 /* qos null data frames are excluded */
888 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 889 goto dont_reorder;
1edfb1af 890
6cc00d54
TP		 891 /* not part of a BA session */
892 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
893 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
894 goto dont_reorder;
895
660c6a44
TP		 896 /* not actually part of this BA session */
897 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
898 goto dont_reorder;
899
1edfb1af
JB		 900 /* new, potentially un-ordered, ampdu frame - process it */
901
902 /* reset session timer */
903 if (tid_agg_rx->timeout)
12d3952f 904 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 905
906 /* if this mpdu is fragmented - terminate rx aggregation session */
907 sc = le16_to_cpu(hdr->seq_ctrl);
908 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 909 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 910 skb_queue_tail(&rx->sdata->skb_queue, skb);
911 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 912 return;
1edfb1af
JB		 913 }
914
a87f736d
JB		 915 /*
916 * No locking needed -- we will only ever process one
917 * RX packet at a time, and thus own tid_agg_rx. All
918 * other code manipulating it needs to (and does) make
919 * sure that we cannot get to it any more before doing
920 * anything with it.
921 */
f9e124fb
CL		 922 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
923 frames))
2569a826
JB		 924 return;
925
926 dont_reorder:
f9e124fb 927 __skb_queue_tail(frames, skb);
1edfb1af 928}
33b64eb2 929
49461622 930static ieee80211_rx_result debug_noinline
5cf121c3 931ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 932{
a7767f95 933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 934 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 935
fd14e266
JB		 936 /*
937 * Drop duplicate 802.11 retransmissions
938 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
939 */
940 if (rx->skb->len >= 24 && rx->sta &&
941 !ieee80211_is_ctl(hdr->frame_control) &&
942 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
943 !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 944 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 945 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 946 hdr->seq_ctrl)) {
554891e6 947 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 948 rx->local->dot11FrameDuplicateCount++;
949 rx->sta->num_duplicates++;
950 }
b1f93314 951 return RX_DROP_UNUSABLE;
571ecf67 952 } else
9e26297a 953 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 954 }
955
571ecf67
JB		 956 if (unlikely(rx->skb->len < 16)) {
957 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 958 return RX_DROP_MONITOR;
571ecf67
JB		 959 }
960
571ecf67
JB		 961 /* Drop disallowed frame classes based on STA auth/assoc state;
962 * IEEE 802.11, Chap 5.5.
963 *
ccd7b362
JB		 964 * mac80211 filters only based on association state, i.e. it drops
965 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 966 * deauth/disassoc frames when needed. In addition, hostapd is
967 * responsible for filtering on both auth and assoc states.
968 */
33b64eb2 969
902acc78 970 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 971 return ieee80211_rx_mesh_check(rx);
33b64eb2 972
a7767f95
HH		 973 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
974 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 975 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 976 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 977 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 978 /*
979 * accept port control frames from the AP even when it's not
980 * yet marked ASSOC to prevent a race where we don't set the
981 * assoc bit quickly enough before it sends the first frame
982 */
983 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 984 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 985 unsigned int hdrlen;
986 __be16 ethertype;
987
988 hdrlen = ieee80211_hdrlen(hdr->frame_control);
989
990 if (rx->skb->len < hdrlen + 8)
991 return RX_DROP_MONITOR;
992
993 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
994 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 995 return RX_CONTINUE;
996 }
21fc7560
JB		 997
998 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
999 cfg80211_rx_spurious_frame(rx->sdata->dev,
1000 hdr->addr2,
1001 GFP_ATOMIC))
1002 return RX_DROP_UNUSABLE;
1003
e4c26add 1004 return RX_DROP_MONITOR;
2a33bee2 1005 }
571ecf67 1006
9ae54c84 1007 return RX_CONTINUE;
570bd537
JB		 1008}
1009
1010
49461622 1011static ieee80211_rx_result debug_noinline
5cf121c3 1012ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 1013{
eb9fb5b8
JB		 1014 struct sk_buff *skb = rx->skb;
1015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 1017 int keyidx;
1018 int hdrlen;
e4c26add 1019 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 1020 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 1021 int mmie_keyidx = -1;
761ab470 1022 __le16 fc;
570bd537 1023
3017b80b
JB		 1024 /*
1025 * Key selection 101
1026 *
3cfcf6ac 1027 * There are four types of keys:
3017b80b 1028 * - GTK (group keys)
3cfcf6ac 1029 * - IGTK (group keys for management frames)
3017b80b
JB		 1030 * - PTK (pairwise keys)
1031 * - STK (station-to-station pairwise keys)
1032 *
1033 * When selecting a key, we have to distinguish between multicast
1034 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 1035 * use PTKs and STKs while the former always use GTKs and IGTKs.
1036 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1037 * unicast frames can also use key indices like GTKs. Hence, if we
1038 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 1039 *
8dc06a1c
JB		 1040 * Note that in a regular BSS, multicast frames are sent by the
1041 * AP only, associated stations unicast the frame to the AP first
1042 * which then multicasts it on their behalf.
1043 *
3017b80b
JB		 1044 * There is also a slight problem in IBSS mode: GTKs are negotiated
1045 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 1046 * The spec seems to expect that one negotiates the same key with
1047 * every station but there's no such requirement; VLANs could be
1048 * possible.
3017b80b
JB		 1049 */
1050
3017b80b 1051 /*
1990af8d 1052 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 1053 * addressed to us nor a multicast frame.
1054 */
554891e6 1055 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1056 return RX_CONTINUE;
3017b80b 1057
2569a826
JB		 1058 /* start without a key */
1059 rx->key = NULL;
1060
d4e46a3d 1061 if (rx->sta)
e31b8213 1062 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 1063
761ab470
JB		 1064 fc = hdr->frame_control;
1065
1066 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 1067 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1068
e31b8213
JB		 1069 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1070 rx->key = sta_ptk;
dc1580dd
JB		 1071 if ((status->flag & RX_FLAG_DECRYPTED) &&
1072 (status->flag & RX_FLAG_IV_STRIPPED))
1073 return RX_CONTINUE;
0c7c10c7 1074 /* Skip decryption if the frame is not protected. */
761ab470 1075 if (!ieee80211_has_protected(fc))
0c7c10c7 1076 return RX_CONTINUE;
3cfcf6ac
JM		 1077 } else if (mmie_keyidx >= 0) {
1078 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 1079 if ((status->flag & RX_FLAG_DECRYPTED) &&
1080 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 1081 return RX_CONTINUE;
1082
1083 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1084 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1085 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 1086 if (rx->sta)
1087 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1088 if (!rx->key)
1089 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 1090 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 1091 /*
1092 * The frame was not protected, so skip decryption. However, we
1093 * need to set rx->key if there is a key that could have been
1094 * used so that the frame may be dropped if encryption would
1095 * have been expected.
1096 */
1097 struct ieee80211_key *key = NULL;
897bed8b
JB		 1098 struct ieee80211_sub_if_data *sdata = rx->sdata;
1099 int i;
1100
761ab470 1101 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1102 is_multicast_ether_addr(hdr->addr1) &&
1103 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1104 rx->key = key;
897bed8b
JB		 1105 else {
1106 if (rx->sta) {
1107 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1108 key = rcu_dereference(rx->sta->gtk[i]);
1109 if (key)
1110 break;
1111 }
1112 }
1113 if (!key) {
1114 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1115 key = rcu_dereference(sdata->keys[i]);
1116 if (key)
1117 break;
1118 }
1119 }
1120 if (key)
1121 rx->key = key;
1122 }
0c7c10c7 1123 return RX_CONTINUE;
571ecf67 1124 } else {
39184b15 1125 u8 keyid;
3017b80b
JB		 1126 /*
1127 * The device doesn't give us the IV so we won't be
1128 * able to look up the key. That's ok though, we
1129 * don't need to decrypt the frame, we just won't
1130 * be able to keep statistics accurate.
1131 * Except for key threshold notifications, should
1132 * we somehow allow the driver to tell us which key
1133 * the hardware used if this flag is set?
1134 */
eb9fb5b8
JB		 1135 if ((status->flag & RX_FLAG_DECRYPTED) &&
1136 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1137 return RX_CONTINUE;
3017b80b 1138
761ab470 1139 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1140
1141 if (rx->skb->len < 8 + hdrlen)
e4c26add 1142 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1143
1144 /*
1145 * no need to call ieee80211_wep_get_keyidx,
1146 * it verifies a bunch of things we've done already
1147 */
39184b15
ZY		 1148 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1149 keyidx = keyid >> 6;
3017b80b 1150
e31b8213
JB		 1151 /* check per-station GTK first, if multicast packet */
1152 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1153 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1154
e31b8213
JB		 1155 /* if not found, try default key */
1156 if (!rx->key) {
1157 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1158
1159 /*
1160 * RSNA-protected unicast frames should always be
1161 * sent with pairwise or station-to-station keys,
1162 * but for WEP we allow using a key index as well.
1163 */
1164 if (rx->key &&
1165 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1166 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1167 !is_multicast_ether_addr(hdr->addr1))
1168 rx->key = NULL;
1169 }
571ecf67
JB		 1170 }
1171
3017b80b 1172 if (rx->key) {
95acac61
JB		 1173 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1174 return RX_DROP_MONITOR;
1175
571ecf67 1176 rx->key->tx_rx_count++;
011bfcc4 1177 /* TODO: add threshold stuff again */
1990af8d 1178 } else {
e4c26add 1179 return RX_DROP_MONITOR;
70f08765
JB		 1180 }
1181
97359d12
JB		 1182 switch (rx->key->conf.cipher) {
1183 case WLAN_CIPHER_SUITE_WEP40:
1184 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1185 result = ieee80211_crypto_wep_decrypt(rx);
1186 break;
97359d12 1187 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1188 result = ieee80211_crypto_tkip_decrypt(rx);
1189 break;
97359d12 1190 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1191 result = ieee80211_crypto_ccmp_decrypt(rx);
1192 break;
97359d12 1193 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1194 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1195 break;
3ffc2a90
JB		 1196 default:
1197 /*
1198 * We can reach here only with HW-only algorithms
1199 * but why didn't it decrypt the frame?!
1200 */
1201 return RX_DROP_UNUSABLE;
70f08765
JB		 1202 }
1203
a8286911
JB		 1204 /* the hdr variable is invalid after the decrypt handlers */
1205
e2f036da 1206 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1207 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1208
1209 return result;
70f08765
JB		 1210}
1211
572e0012
KV		 1212static ieee80211_rx_result debug_noinline
1213ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1214{
1215 struct ieee80211_local *local;
1216 struct ieee80211_hdr *hdr;
1217 struct sk_buff *skb;
1218
1219 local = rx->local;
1220 skb = rx->skb;
1221 hdr = (struct ieee80211_hdr *) skb->data;
1222
1223 if (!local->pspolling)
1224 return RX_CONTINUE;
1225
1226 if (!ieee80211_has_fromds(hdr->frame_control))
1227 /* this is not from AP */
1228 return RX_CONTINUE;
1229
1230 if (!ieee80211_is_data(hdr->frame_control))
1231 return RX_CONTINUE;
1232
1233 if (!ieee80211_has_moredata(hdr->frame_control)) {
1234 /* AP has no more frames buffered for us */
1235 local->pspolling = false;
1236 return RX_CONTINUE;
1237 }
1238
1239 /* more data bit is set, let's request a new frame from the AP */
1240 ieee80211_send_pspoll(local, rx->sdata);
1241
1242 return RX_CONTINUE;
1243}
1244
d012a605 1245static void sta_ps_start(struct sta_info *sta)
571ecf67 1246{
133b8226 1247 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1248 struct ieee80211_local *local = sdata->local;
d012a605 1249 struct ps_data *ps;
0795af57 1250
d012a605
MP		 1251 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1252 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1253 ps = &sdata->bss->ps;
1254 else
1255 return;
1256
1257 atomic_inc(&ps->num_sta_ps);
c2c98fde 1258 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1259 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1260 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1261 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1262 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1263}
1264
d012a605 1265static void sta_ps_end(struct sta_info *sta)
571ecf67 1266{
bdcbd8e0
JB		 1267 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1268 sta->sta.addr, sta->sta.aid);
004c872e 1269
c2c98fde 1270 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1271 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1272 sta->sta.addr, sta->sta.aid);
af818581
JB		 1273 return;
1274 }
1275
1276 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1277}
1278
d057e5a3
AN		 1279int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1280{
1281 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1282 bool in_ps;
1283
1284 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1285
1286 /* Don't let the same PS state be set twice */
c2c98fde 1287 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1288 if ((start && in_ps) || (!start && !in_ps))
1289 return -EINVAL;
1290
1291 if (start)
d012a605 1292 sta_ps_start(sta_inf);
d057e5a3 1293 else
d012a605 1294 sta_ps_end(sta_inf);
d057e5a3
AN		 1295
1296 return 0;
1297}
1298EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1299
47086fc5
JB		 1300static ieee80211_rx_result debug_noinline
1301ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1302{
1303 struct ieee80211_sub_if_data *sdata = rx->sdata;
1304 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1305 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1306 int tid, ac;
1307
1308 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1309 return RX_CONTINUE;
1310
1311 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1312 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1313 return RX_CONTINUE;
1314
1315 /*
1316 * The device handles station powersave, so don't do anything about
1317 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1318 * it to mac80211 since they're handled.)
1319 */
1320 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1321 return RX_CONTINUE;
1322
1323 /*
1324 * Don't do anything if the station isn't already asleep. In
1325 * the uAPSD case, the station will probably be marked asleep,
1326 * in the PS-Poll case the station must be confused ...
1327 */
c2c98fde 1328 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1329 return RX_CONTINUE;
1330
1331 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1332 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1333 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1334 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1335 else
c2c98fde 1336 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1337 }
47086fc5
JB		 1338
1339 /* Free PS Poll skb here instead of returning RX_DROP that would
1340 * count as an dropped frame. */
1341 dev_kfree_skb(rx->skb);
1342
1343 return RX_QUEUED;
1344 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1345 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1346 ieee80211_has_pm(hdr->frame_control) &&
1347 (ieee80211_is_data_qos(hdr->frame_control) ||
1348 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1349 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1350 ac = ieee802_1d_to_ac[tid & 7];
1351
1352 /*
1353 * If this AC is not trigger-enabled do nothing.
1354 *
1355 * NB: This could/should check a separate bitmap of trigger-
1356 * enabled queues, but for now we only implement uAPSD w/o
1357 * TSPEC changes to the ACs, so they're always the same.
1358 */
1359 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1360 return RX_CONTINUE;
1361
1362 /* if we are in a service period, do nothing */
c2c98fde 1363 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1364 return RX_CONTINUE;
1365
c2c98fde 1366 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1367 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1368 else
c2c98fde 1369 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1370 }
1371
1372 return RX_CONTINUE;
1373}
1374
49461622 1375static ieee80211_rx_result debug_noinline
5cf121c3 1376ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1377{
1378 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1379 struct sk_buff *skb = rx->skb;
1380 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1382
1383 if (!sta)
9ae54c84 1384 return RX_CONTINUE;
571ecf67 1385
b291ba11
JB		 1386 /*
1387 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1388 * BSSID and for station already AUTHORIZED to avoid keeping the
1389 * current IBSS network alive in cases where other STAs start
1390 * using different BSSID. This will also give the station another
1391 * chance to restart the authentication/authorization in case
1392 * something went wrong the first time.
b291ba11 1393 */
05c914fe 1394 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1395 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1396 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1397 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1398 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1399 sta->last_rx = jiffies;
3af6334c
FF		 1400 if (ieee80211_is_data(hdr->frame_control)) {
1401 sta->last_rx_rate_idx = status->rate_idx;
1402 sta->last_rx_rate_flag = status->flag;
5614618e 1403 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1404 }
1405 }
b291ba11
JB		 1406 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1407 /*
33b64eb2
LCC		 1408 * Mesh beacons will update last_rx when if they are found to
1409 * match the current local configuration when processed.
571ecf67 1410 */
b291ba11 1411 sta->last_rx = jiffies;
3af6334c
FF		 1412 if (ieee80211_is_data(hdr->frame_control)) {
1413 sta->last_rx_rate_idx = status->rate_idx;
1414 sta->last_rx_rate_flag = status->flag;
5614618e 1415 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1416 }
571ecf67
JB		 1417 }
1418
554891e6 1419 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1420 return RX_CONTINUE;
571ecf67 1421
3cf335d5
KV		 1422 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1423 ieee80211_sta_rx_notify(rx->sdata, hdr);
1424
571ecf67
JB		 1425 sta->rx_fragments++;
1426 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1427 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1428 sta->last_signal = status->signal;
1429 ewma_add(&sta->avg_signal, -status->signal);
1430 }
571ecf67 1431
72eaa43a
JB		 1432 /*
1433 * Change STA power saving mode only at the end of a frame
1434 * exchange sequence.
1435 */
d057e5a3
AN		 1436 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1437 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1438 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1439 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1440 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1441 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1442 /*
1443 * Ignore doze->wake transitions that are
1444 * indicated by non-data frames, the standard
1445 * is unclear here, but for example going to
1446 * PS mode and then scanning would cause a
1447 * doze->wake transition for the probe request,
1448 * and that is clearly undesirable.
1449 */
1450 if (ieee80211_is_data(hdr->frame_control) &&
1451 !ieee80211_has_pm(hdr->frame_control))
d012a605 1452 sta_ps_end(sta);
72eaa43a
JB		 1453 } else {
1454 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1455 sta_ps_start(sta);
72eaa43a 1456 }
571ecf67
JB		 1457 }
1458
3f52b7e3
MP		 1459 /* mesh power save support */
1460 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1461 ieee80211_mps_rx_h_sta_process(sta, hdr);
1462
22403def
JB		 1463 /*
1464 * Drop (qos-)data::nullfunc frames silently, since they
1465 * are used only to control station power saving mode.
1466 */
1467 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1468 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1469 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1470
1471 /*
1472 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1473 * that was not moved to a 4-addr STA vlan yet send
1474 * the event to userspace and for older hostapd drop
1475 * the frame to the monitor interface.
d524215f
FF		 1476 */
1477 if (ieee80211_has_a4(hdr->frame_control) &&
1478 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1479 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1480 !rx->sdata->u.vlan.sta))) {
1481 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1482 cfg80211_rx_unexpected_4addr_frame(
1483 rx->sdata->dev, sta->sta.addr,
1484 GFP_ATOMIC);
d524215f 1485 return RX_DROP_MONITOR;
e7f4a940 1486 }
22403def
JB		 1487 /*
1488 * Update counter and free packet here to avoid
1489 * counting this as a dropped packed.
1490 */
571ecf67
JB		 1491 sta->rx_packets++;
1492 dev_kfree_skb(rx->skb);
9ae54c84 1493 return RX_QUEUED;
571ecf67
JB		 1494 }
1495
9ae54c84 1496 return RX_CONTINUE;
571ecf67
JB		 1497} /* ieee80211_rx_h_sta_process */
1498
571ecf67
JB		 1499static inline struct ieee80211_fragment_entry *
1500ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1501 unsigned int frag, unsigned int seq, int rx_queue,
1502 struct sk_buff **skb)
1503{
1504 struct ieee80211_fragment_entry *entry;
571ecf67 1505
571ecf67
JB		 1506 entry = &sdata->fragments[sdata->fragment_next++];
1507 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1508 sdata->fragment_next = 0;
1509
bdcbd8e0 1510 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1511 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1512
1513 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1514 *skb = NULL;
1515 entry->first_frag_time = jiffies;
1516 entry->seq = seq;
1517 entry->rx_queue = rx_queue;
1518 entry->last_frag = frag;
1519 entry->ccmp = 0;
1520 entry->extra_len = 0;
1521
1522 return entry;
1523}
1524
1525static inline struct ieee80211_fragment_entry *
1526ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1527 unsigned int frag, unsigned int seq,
571ecf67
JB		 1528 int rx_queue, struct ieee80211_hdr *hdr)
1529{
1530 struct ieee80211_fragment_entry *entry;
1531 int i, idx;
1532
1533 idx = sdata->fragment_next;
1534 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1535 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1536
1537 idx--;
1538 if (idx < 0)
1539 idx = IEEE80211_FRAGMENT_MAX - 1;
1540
1541 entry = &sdata->fragments[idx];
1542 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1543 entry->rx_queue != rx_queue ||
1544 entry->last_frag + 1 != frag)
1545 continue;
1546
b73d70ad 1547 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1548
b73d70ad
HH		 1549 /*
1550 * Check ftype and addresses are equal, else check next fragment
1551 */
1552 if (((hdr->frame_control ^ f_hdr->frame_control) &
1553 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1554 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1555 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1556 continue;
1557
ab46623e 1558 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1559 __skb_queue_purge(&entry->skb_list);
1560 continue;
1561 }
1562 return entry;
1563 }
1564
1565 return NULL;
1566}
1567
49461622 1568static ieee80211_rx_result debug_noinline
5cf121c3 1569ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1570{
1571 struct ieee80211_hdr *hdr;
1572 u16 sc;
358c8d9d 1573 __le16 fc;
571ecf67
JB		 1574 unsigned int frag, seq;
1575 struct ieee80211_fragment_entry *entry;
1576 struct sk_buff *skb;
554891e6 1577 struct ieee80211_rx_status *status;
571ecf67 1578
b73d70ad 1579 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1580 fc = hdr->frame_control;
f7fbf70e
JC		 1581
1582 if (ieee80211_is_ctl(fc))
1583 return RX_CONTINUE;
1584
571ecf67
JB		 1585 sc = le16_to_cpu(hdr->seq_ctrl);
1586 frag = sc & IEEE80211_SCTL_FRAG;
1587
2e613ff8
JB		 1588 if (is_multicast_ether_addr(hdr->addr1)) {
1589 rx->local->dot11MulticastReceivedFrameCount++;
47e60160 1590 goto out_no_led;
571ecf67 1591 }
2e613ff8 1592
47e60160
AM		 1593 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1594 goto out;
1595
571ecf67
JB		 1596 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1597
e3cf8b3f
ZY		 1598 if (skb_linearize(rx->skb))
1599 return RX_DROP_UNUSABLE;
1600
058897a4
AK		 1601 /*
1602 * skb_linearize() might change the skb->data and
1603 * previously cached variables (in this case, hdr) need to
1604 * be refreshed with the new data.
1605 */
1606 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1607 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1608
1609 if (frag == 0) {
1610 /* This is the first fragment of a new frame. */
1611 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1612 rx->seqno_idx, &(rx->skb));
97359d12 1613 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1614 ieee80211_has_protected(fc)) {
9e26297a 1615 int queue = rx->security_idx;
571ecf67
JB		 1616 /* Store CCMP PN so that we can verify that the next
1617 * fragment has a sequential PN value. */
1618 entry->ccmp = 1;
1619 memcpy(entry->last_pn,
9190252c 1620 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1621 CCMP_PN_LEN);
1622 }
9ae54c84 1623 return RX_QUEUED;
571ecf67
JB		 1624 }
1625
1626 /* This is a fragment for a frame that should already be pending in
1627 * fragment cache. Add this fragment to the end of the pending entry.
1628 */
9e26297a
JB		 1629 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1630 rx->seqno_idx, hdr);
571ecf67
JB		 1631 if (!entry) {
1632 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1633 return RX_DROP_MONITOR;
571ecf67
JB		 1634 }
1635
1636 /* Verify that MPDUs within one MSDU have sequential PN values.
1637 * (IEEE 802.11i, 8.3.3.4.5) */
1638 if (entry->ccmp) {
1639 int i;
1640 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1641 int queue;
97359d12 1642 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1643 return RX_DROP_UNUSABLE;
571ecf67
JB		 1644 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1645 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1646 pn[i]++;
1647 if (pn[i])
1648 break;
1649 }
9e26297a 1650 queue = rx->security_idx;
9190252c 1651 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1652 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1653 return RX_DROP_UNUSABLE;
571ecf67
JB		 1654 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1655 }
1656
358c8d9d 1657 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1658 __skb_queue_tail(&entry->skb_list, rx->skb);
1659 entry->last_frag = frag;
1660 entry->extra_len += rx->skb->len;
358c8d9d 1661 if (ieee80211_has_morefrags(fc)) {
571ecf67 1662 rx->skb = NULL;
9ae54c84 1663 return RX_QUEUED;
571ecf67
JB		 1664 }
1665
1666 rx->skb = __skb_dequeue(&entry->skb_list);
1667 if (skb_tailroom(rx->skb) < entry->extra_len) {
1668 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1669 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1670 GFP_ATOMIC))) {
1671 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1672 __skb_queue_purge(&entry->skb_list);
e4c26add 1673 return RX_DROP_UNUSABLE;
571ecf67
JB		 1674 }
1675 }
1676 while ((skb = __skb_dequeue(&entry->skb_list))) {
1677 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1678 dev_kfree_skb(skb);
1679 }
1680
1681 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1682 status = IEEE80211_SKB_RXCB(rx->skb);
1683 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1684
1685 out:
47e60160
AM		 1686 ieee80211_led_rx(rx->local);
1687 out_no_led:
571ecf67
JB		 1688 if (rx->sta)
1689 rx->sta->rx_packets++;
9ae54c84 1690 return RX_CONTINUE;
571ecf67
JB		 1691}
1692
1df332e8 1693static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1694{
1df332e8 1695 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1696 return -EACCES;
571ecf67 1697
76ee65bf 1698 return 0;
571ecf67
JB		 1699}
1700
1df332e8 1701static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1702{
eb9fb5b8
JB		 1703 struct sk_buff *skb = rx->skb;
1704 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1705
3017b80b 1706 /*
7848ba7d
JB		 1707 * Pass through unencrypted frames if the hardware has
1708 * decrypted them already.
3017b80b 1709 */
eb9fb5b8 1710 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1711 return 0;
571ecf67
JB		 1712
1713 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1714 if (unlikely(!ieee80211_has_protected(fc) &&
1715 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1716 ieee80211_is_data(fc) &&
b3fc9c6c 1717 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1718 return -EACCES;
bef5d1c7
JB		 1719
1720 return 0;
1721}
1722
1df332e8 1723static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1724{
1725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1726 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1727 __le16 fc = hdr->frame_control;
bef5d1c7 1728
e3efca0a
JM		 1729 /*
1730 * Pass through unencrypted frames if the hardware has
1731 * decrypted them already.
1732 */
1733 if (status->flag & RX_FLAG_DECRYPTED)
1734 return 0;
bef5d1c7 1735
c2c98fde 1736 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1737 if (unlikely(!ieee80211_has_protected(fc) &&
1738 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1739 rx->key)) {
1740 if (ieee80211_is_deauth(fc))
1741 cfg80211_send_unprot_deauth(rx->sdata->dev,
1742 rx->skb->data,
1743 rx->skb->len);
1744 else if (ieee80211_is_disassoc(fc))
1745 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1746 rx->skb->data,
1747 rx->skb->len);
f2ca3ea4 1748 return -EACCES;
cf4e594e 1749 }
f2ca3ea4 1750 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1751 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1752 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1753 if (ieee80211_is_deauth(fc))
1754 cfg80211_send_unprot_deauth(rx->sdata->dev,
1755 rx->skb->data,
1756 rx->skb->len);
1757 else if (ieee80211_is_disassoc(fc))
1758 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1759 rx->skb->data,
1760 rx->skb->len);
f2ca3ea4 1761 return -EACCES;
cf4e594e 1762 }
f2ca3ea4
JM		 1763 /*
1764 * When using MFP, Action frames are not allowed prior to
1765 * having configured keys.
1766 */
1767 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1768 ieee80211_is_robust_mgmt_frame(
1769 (struct ieee80211_hdr *) rx->skb->data)))
1770 return -EACCES;
1771 }
b3fc9c6c 1772
76ee65bf 1773 return 0;
571ecf67
JB		 1774}
1775
76ee65bf 1776static int
4114fa21 1777__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1778{
eb9fb5b8 1779 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1781 bool check_port_control = false;
1782 struct ethhdr *ehdr;
1783 int ret;
f14543ee 1784
4114fa21 1785 *port_control = false;
9bc383de
JB		 1786 if (ieee80211_has_a4(hdr->frame_control) &&
1787 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1788 return -1;
9bc383de 1789
fbb327c5
FF		 1790 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1791 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1792
1793 if (!sdata->u.mgd.use_4addr)
1794 return -1;
1795 else
1796 check_port_control = true;
1797 }
1798
9bc383de 1799 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1800 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1801 return -1;
571ecf67 1802
fbb327c5 1803 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1804 if (ret < 0)
fbb327c5
FF		 1805 return ret;
1806
1807 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1808 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1809 *port_control = true;
1810 else if (check_port_control)
fbb327c5
FF		 1811 return -1;
1812
1813 return 0;
76ee65bf 1814}
571ecf67 1815
ce3edf6d
JB		 1816/*
1817 * requires that rx->skb is a frame with ethernet header
1818 */
358c8d9d 1819static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1820{
c97c23e3 1821 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1822 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1823 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1824
1825 /*
1826 * Allow EAPOL frames to us/the PAE group address regardless
1827 * of whether the frame was encrypted or not.
1828 */
a621fa4d 1829 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1830 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1831 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1832 return true;
1833
1834 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1835 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1836 return false;
1837
1838 return true;
1839}
1840
1841/*
1842 * requires that rx->skb is a frame with ethernet header
1843 */
76ee65bf 1844static void
5cf121c3 1845ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1846{
eb9fb5b8
JB		 1847 struct ieee80211_sub_if_data *sdata = rx->sdata;
1848 struct net_device *dev = sdata->dev;
76ee65bf 1849 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1850 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1851 struct sta_info *dsta;
554891e6 1852 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1853
76ee65bf
RR		 1854 skb = rx->skb;
1855 xmit_skb = NULL;
571ecf67 1856
05c914fe
JB		 1857 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1858 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1859 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1860 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1861 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1862 if (is_multicast_ether_addr(ehdr->h_dest)) {
1863 /*
1864 * send multicast frames both to higher layers in
1865 * local net stack and back to the wireless medium
1866 */
76ee65bf 1867 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1868 if (!xmit_skb)
bdcbd8e0 1869 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1870 dev->name);
571ecf67 1871 } else {
abe60632
JB		 1872 dsta = sta_info_get(sdata, skb->data);
1873 if (dsta) {
ce3edf6d
JB		 1874 /*
1875 * The destination station is associated to
1876 * this AP (in this VLAN), so send the frame
1877 * directly to it and do not pass it to local
1878 * net stack.
571ecf67 1879 */
76ee65bf 1880 xmit_skb = skb;
571ecf67
JB		 1881 skb = NULL;
1882 }
571ecf67
JB		 1883 }
1884 }
1885
1886 if (skb) {
d1c3a37c
JB		 1887 int align __maybe_unused;
1888
59d9cb07 1889#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1890 /*
1891 * 'align' will only take the values 0 or 2 here
1892 * since all frames are required to be aligned
1893 * to 2-byte boundaries when being passed to
191922cd
JB		 1894 * mac80211; the code here works just as well if
1895 * that isn't true, but mac80211 assumes it can
1896 * access fields as 2-byte aligned (e.g. for
1897 * compare_ether_addr)
d1c3a37c 1898 */
dacb6f1d 1899 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1900 if (align) {
1901 if (WARN_ON(skb_headroom(skb) < 3)) {
1902 dev_kfree_skb(skb);
1903 skb = NULL;
1904 } else {
1905 u8 *data = skb->data;
8ce0b589
ZY		 1906 size_t len = skb_headlen(skb);
1907 skb->data -= align;
1908 memmove(skb->data, data, len);
1909 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1910 }
1911 }
1912#endif
1913
1914 if (skb) {
1915 /* deliver to local stack */
1916 skb->protocol = eth_type_trans(skb, dev);
1917 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1918 netif_receive_skb(skb);
d1c3a37c 1919 }
571ecf67
JB		 1920 }
1921
76ee65bf 1922 if (xmit_skb) {
aef6c928
HS		 1923 /*
1924 * Send to wireless media and increase priority by 256 to
1925 * keep the received priority instead of reclassifying
1926 * the frame (see cfg80211_classify8021d).
1927 */
1928 xmit_skb->priority += 256;
f831e909 1929 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1930 skb_reset_network_header(xmit_skb);
1931 skb_reset_mac_header(xmit_skb);
76ee65bf 1932 dev_queue_xmit(xmit_skb);
571ecf67 1933 }
76ee65bf
RR		 1934}
1935
49461622 1936static ieee80211_rx_result debug_noinline
5cf121c3 1937ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1938{
eb9fb5b8 1939 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1940 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1941 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1942 __le16 fc = hdr->frame_control;
eaf85ca7 1943 struct sk_buff_head frame_list;
554891e6 1944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1945
358c8d9d 1946 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1947 return RX_CONTINUE;
fd4c7f2f 1948
358c8d9d 1949 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1950 return RX_DROP_MONITOR;
fd4c7f2f 1951
554891e6 1952 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1953 return RX_CONTINUE;
fd4c7f2f 1954
f862950d
JB		 1955 if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
1956 switch (rx->sdata->vif.type) {
1957 case NL80211_IFTYPE_AP_VLAN:
1958 if (!rx->sdata->u.vlan.sta)
1959 return RX_DROP_UNUSABLE;
1960 break;
1961 case NL80211_IFTYPE_STATION:
1962 if (!rx->sdata->u.mgd.use_4addr)
1963 return RX_DROP_UNUSABLE;
1964 break;
1965 default:
1966 return RX_DROP_UNUSABLE;
1967 }
1968 }
fd4c7f2f 1969
f862950d 1970 if (is_multicast_ether_addr(hdr->addr1))
e4c26add 1971 return RX_DROP_UNUSABLE;
fd4c7f2f 1972
eaf85ca7
ZY		 1973 skb->dev = dev;
1974 __skb_queue_head_init(&frame_list);
fd4c7f2f 1975
e3cf8b3f
ZY		 1976 if (skb_linearize(skb))
1977 return RX_DROP_UNUSABLE;
1978
eaf85ca7
ZY		 1979 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1980 rx->sdata->vif.type,
8b3becad 1981 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1982
eaf85ca7
ZY		 1983 while (!skb_queue_empty(&frame_list)) {
1984 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1985
358c8d9d 1986 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1987 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1988 continue;
1989 }
eaf85ca7
ZY		 1990 dev->stats.rx_packets++;
1991 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1992
1993 ieee80211_deliver_skb(rx);
1994 }
1995
9ae54c84 1996 return RX_QUEUED;
fd4c7f2f
RR		 1997}
1998
bf94e17b 1999#ifdef CONFIG_MAC80211_MESH
b0dee578 2000static ieee80211_rx_result
e32f85f7
LCC		 2001ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2002{
30789eb6
TP		 2003 struct ieee80211_hdr *fwd_hdr, *hdr;
2004 struct ieee80211_tx_info *info;
e32f85f7 2005 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 2006 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 2007 struct ieee80211_local *local = rx->local;
eb9fb5b8 2008 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2009 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 2010 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 2011 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 2012 u16 q, hdrlen;
e32f85f7
LCC		 2013
2014 hdr = (struct ieee80211_hdr *) skb->data;
2015 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 2016
2017 /* make sure fixed part of mesh header is there, also checks skb len */
2018 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2019 return RX_DROP_MONITOR;
2020
2021 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2022
2023 /* make sure full mesh header is there, also checks skb len */
2024 if (!pskb_may_pull(rx->skb,
2025 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2026 return RX_DROP_MONITOR;
2027
2028 /* reload pointers */
2029 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 2030 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2031
58aef0a8
BC		 2032 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2033 return RX_DROP_MONITOR;
2034
2157fdd6
TP		 2035 /* frame is in RMC, don't forward */
2036 if (ieee80211_is_data(hdr->frame_control) &&
2037 is_multicast_ether_addr(hdr->addr1) &&
bf7cd94d 2038 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
2157fdd6
TP		 2039 return RX_DROP_MONITOR;
2040
555cb715
JC		 2041 if (!ieee80211_is_data(hdr->frame_control) ||
2042 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 2043 return RX_CONTINUE;
2044
2045 if (!mesh_hdr->ttl)
e32f85f7
LCC		 2046 return RX_DROP_MONITOR;
2047
43b7b314 2048 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 2049 struct mesh_path *mppath;
43b7b314
JC		 2050 char *proxied_addr;
2051 char *mpp_addr;
2052
2053 if (is_multicast_ether_addr(hdr->addr1)) {
2054 mpp_addr = hdr->addr3;
2055 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 2056 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2057 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 2058 mpp_addr = hdr->addr4;
2059 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2060 } else {
2061 return RX_DROP_MONITOR;
43b7b314 2062 }
79617dee 2063
79617dee 2064 rcu_read_lock();
bf7cd94d 2065 mppath = mpp_path_lookup(sdata, proxied_addr);
79617dee 2066 if (!mppath) {
bf7cd94d 2067 mpp_path_add(sdata, proxied_addr, mpp_addr);
79617dee
Y		 2068 } else {
2069 spin_lock_bh(&mppath->state_lock);
b203ca39 2070 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2071 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2072 spin_unlock_bh(&mppath->state_lock);
2073 }
2074 rcu_read_unlock();
2075 }
2076
3c5772a5
JC		 2077 /* Frame has reached destination. Don't forward */
2078 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2079 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2080 return RX_CONTINUE;
2081
00e96dec 2082 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2083 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2084 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2085 return RX_DROP_MONITOR;
2086 }
2087 skb_set_queue_mapping(skb, q);
e32f85f7 2088
30789eb6
TP		 2089 if (!--mesh_hdr->ttl) {
2090 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2091 goto out;
30789eb6
TP		 2092 }
2093
d665508b
CYY		 2094 if (!ifmsh->mshcfg.dot11MeshForwarding)
2095 goto out;
2096
30789eb6
TP		 2097 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2098 if (!fwd_skb) {
bdcbd8e0 2099 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2100 sdata->name);
30789eb6
TP		 2101 goto out;
2102 }
2103
2104 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
9d6d6f49 2105 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
30789eb6
TP		 2106 info = IEEE80211_SKB_CB(fwd_skb);
2107 memset(info, 0, sizeof(*info));
2108 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2109 info->control.vif = &rx->sdata->vif;
2110 info->control.jiffies = jiffies;
2111 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2112 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2113 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3f52b7e3
MP		 2114 /* update power mode indication when forwarding */
2115 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
bf7cd94d 2116 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
3f52b7e3 2117 /* mesh power mode flags updated in mesh_nexthop_lookup */
30789eb6
TP		 2118 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2119 } else {
2120 /* unable to resolve next hop */
bf7cd94d
JB		 2121 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
2122 fwd_hdr->addr3, 0, reason, fwd_hdr->addr2);
30789eb6 2123 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2124 kfree_skb(fwd_skb);
30789eb6 2125 return RX_DROP_MONITOR;
e32f85f7
LCC		 2126 }
2127
30789eb6
TP		 2128 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2129 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2130 out:
3c5772a5 2131 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2132 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2133 return RX_CONTINUE;
2134 else
2135 return RX_DROP_MONITOR;
2136}
bf94e17b 2137#endif
e32f85f7 2138
49461622 2139static ieee80211_rx_result debug_noinline
5cf121c3 2140ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2141{
eb9fb5b8 2142 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2143 struct ieee80211_local *local = rx->local;
eb9fb5b8 2144 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2145 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2146 __le16 fc = hdr->frame_control;
4114fa21 2147 bool port_control;
ce3edf6d 2148 int err;
76ee65bf 2149
358c8d9d 2150 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2151 return RX_CONTINUE;
76ee65bf 2152
358c8d9d 2153 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2154 return RX_DROP_MONITOR;
76ee65bf 2155
f14543ee 2156 /*
e7f4a940
JB		 2157 * Send unexpected-4addr-frame event to hostapd. For older versions,
2158 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2159 */
2160 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2161 sdata->vif.type == NL80211_IFTYPE_AP) {
2162 if (rx->sta &&
2163 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2164 cfg80211_rx_unexpected_4addr_frame(
2165 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2166 return RX_DROP_MONITOR;
e7f4a940 2167 }
f14543ee 2168
4114fa21 2169 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2170 if (unlikely(err))
e4c26add 2171 return RX_DROP_UNUSABLE;
76ee65bf 2172
358c8d9d 2173 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2174 return RX_DROP_MONITOR;
ce3edf6d 2175
4114fa21
FF		 2176 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2177 unlikely(port_control) && sdata->bss) {
2178 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2179 u.ap);
2180 dev = sdata->dev;
2181 rx->sdata = sdata;
2182 }
2183
76ee65bf
RR		 2184 rx->skb->dev = dev;
2185
2186 dev->stats.rx_packets++;
2187 dev->stats.rx_bytes += rx->skb->len;
2188
08ca944e 2189 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2190 !is_multicast_ether_addr(
2191 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2192 (!local->scanning &&
2193 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2194 mod_timer(&local->dynamic_ps_timer, jiffies +
2195 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2196 }
2197
76ee65bf 2198 ieee80211_deliver_skb(rx);
571ecf67 2199
9ae54c84 2200 return RX_QUEUED;
571ecf67
JB		 2201}
2202
49461622 2203static ieee80211_rx_result debug_noinline
f9e124fb 2204ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716 2205{
71364716 2206 struct sk_buff *skb = rx->skb;
a7767f95 2207 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2208 struct tid_ampdu_rx *tid_agg_rx;
2209 u16 start_seq_num;
2210 u16 tid;
2211
a7767f95 2212 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2213 return RX_CONTINUE;
71364716 2214
a7767f95 2215 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2216 struct {
2217 __le16 control, start_seq_num;
2218 } __packed bar_data;
2219
71364716 2220 if (!rx->sta)
a02ae758 2221 return RX_DROP_MONITOR;
8ae5977f
JB		 2222
2223 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2224 &bar_data, sizeof(bar_data)))
2225 return RX_DROP_MONITOR;
2226
8ae5977f 2227 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2228
2229 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2230 if (!tid_agg_rx)
a02ae758 2231 return RX_DROP_MONITOR;
71364716 2232
8ae5977f 2233 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2234
2235 /* reset session timer */
20ad19d0
JB		 2236 if (tid_agg_rx->timeout)
2237 mod_timer(&tid_agg_rx->session_timer,
2238 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2239
dd318575 2240 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2241 /* release stored frames up to start of BAR */
d3b2fb53 2242 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
f9e124fb 2243 start_seq_num, frames);
dd318575
JB		 2244 spin_unlock(&tid_agg_rx->reorder_lock);
2245
a02ae758
JB		 2246 kfree_skb(skb);
2247 return RX_QUEUED;
71364716
RR		 2248 }
2249
08daecae
JB		 2250 /*
2251 * After this point, we only want management frames,
2252 * so we can drop all remaining control frames to
2253 * cooked monitor interfaces.
2254 */
2255 return RX_DROP_MONITOR;
71364716
RR		 2256}
2257
f4f727a6
JM		 2258static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2259 struct ieee80211_mgmt *mgmt,
2260 size_t len)
fea14732
JM		 2261{
2262 struct ieee80211_local *local = sdata->local;
2263 struct sk_buff *skb;
2264 struct ieee80211_mgmt *resp;
2265
b203ca39 2266 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2267 /* Not to own unicast address */
2268 return;
2269 }
2270
b203ca39
JP		 2271 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2272 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2273 /* Not from the current AP or not associated yet. */
fea14732
JM		 2274 return;
2275 }
2276
2277 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2278 /* Too short SA Query request frame */
2279 return;
2280 }
2281
2282 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2283 if (skb == NULL)
2284 return;
2285
2286 skb_reserve(skb, local->hw.extra_tx_headroom);
2287 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2288 memset(resp, 0, 24);
2289 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2290 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2291 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2292 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2293 IEEE80211_STYPE_ACTION);
2294 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2295 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2296 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2297 memcpy(resp->u.action.u.sa_query.trans_id,
2298 mgmt->u.action.u.sa_query.trans_id,
2299 WLAN_SA_QUERY_TR_ID_LEN);
2300
62ae67be 2301 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2302}
2303
2e161f78
JB		 2304static ieee80211_rx_result debug_noinline
2305ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2306{
2307 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2308 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2309
2310 /*
2311 * From here on, look only at management frames.
2312 * Data and control frames are already handled,
2313 * and unknown (reserved) frames are useless.
2314 */
2315 if (rx->skb->len < 24)
2316 return RX_DROP_MONITOR;
2317
2318 if (!ieee80211_is_mgmt(mgmt->frame_control))
2319 return RX_DROP_MONITOR;
2320
ee971924
JB		 2321 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2322 ieee80211_is_beacon(mgmt->frame_control) &&
2323 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2324 int sig = 0;
2325
2326 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2327 sig = status->signal;
2328
ee971924
JB		 2329 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2330 rx->skb->data, rx->skb->len,
37c73b5f 2331 status->freq, sig);
ee971924
JB		 2332 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2333 }
2334
554891e6 2335 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2336 return RX_DROP_MONITOR;
2337
2338 if (ieee80211_drop_unencrypted_mgmt(rx))
2339 return RX_DROP_UNUSABLE;
2340
2341 return RX_CONTINUE;
2342}
2343
de1ede7a
JB		 2344static ieee80211_rx_result debug_noinline
2345ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2346{
2347 struct ieee80211_local *local = rx->local;
eb9fb5b8 2348 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2349 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2350 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2351 int len = rx->skb->len;
2352
2353 if (!ieee80211_is_action(mgmt->frame_control))
2354 return RX_CONTINUE;
2355
026331c4
JM		 2356 /* drop too small frames */
2357 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2358 return RX_DROP_UNUSABLE;
de1ede7a 2359
815b8092
MP		 2360 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
2361 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED)
84040805 2362 return RX_DROP_UNUSABLE;
de1ede7a 2363
554891e6 2364 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2365 return RX_DROP_UNUSABLE;
97ebe12a 2366
de1ede7a 2367 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2368 case WLAN_CATEGORY_HT:
2369 /* reject HT action frames from stations not supporting HT */
2370 if (!rx->sta->sta.ht_cap.ht_supported)
2371 goto invalid;
2372
2373 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2374 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2375 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2376 sdata->vif.type != NL80211_IFTYPE_AP &&
2377 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2378 break;
2379
ec61cd63 2380 /* verify action & smps_control/chanwidth are present */
1d8d3dec
JB		 2381 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2382 goto invalid;
2383
2384 switch (mgmt->u.action.u.ht_smps.action) {
2385 case WLAN_HT_ACTION_SMPS: {
2386 struct ieee80211_supported_band *sband;
af0ed69b 2387 enum ieee80211_smps_mode smps_mode;
1d8d3dec
JB		 2388
2389 /* convert to HT capability */
2390 switch (mgmt->u.action.u.ht_smps.smps_control) {
2391 case WLAN_HT_SMPS_CONTROL_DISABLED:
af0ed69b 2392 smps_mode = IEEE80211_SMPS_OFF;
1d8d3dec
JB		 2393 break;
2394 case WLAN_HT_SMPS_CONTROL_STATIC:
af0ed69b 2395 smps_mode = IEEE80211_SMPS_STATIC;
1d8d3dec
JB		 2396 break;
2397 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
af0ed69b 2398 smps_mode = IEEE80211_SMPS_DYNAMIC;
1d8d3dec
JB		 2399 break;
2400 default:
2401 goto invalid;
2402 }
1d8d3dec
JB		 2403
2404 /* if no change do nothing */
af0ed69b 2405 if (rx->sta->sta.smps_mode == smps_mode)
1d8d3dec 2406 goto handled;
af0ed69b 2407 rx->sta->sta.smps_mode = smps_mode;
1d8d3dec
JB		 2408
2409 sband = rx->local->hw.wiphy->bands[status->band];
2410
64f68e5d
JB		 2411 rate_control_rate_update(local, sband, rx->sta,
2412 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2413 goto handled;
2414 }
ec61cd63
JB		 2415 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2416 struct ieee80211_supported_band *sband;
2417 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
e1a0c6b3 2418 enum ieee80211_sta_rx_bandwidth new_bw;
ec61cd63
JB		 2419
2420 /* If it doesn't support 40 MHz it can't change ... */
e1a0c6b3
JB		 2421 if (!(rx->sta->sta.ht_cap.cap &
2422 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
ec61cd63
JB		 2423 goto handled;
2424
e1a0c6b3
JB		 2425 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
2426 new_bw = IEEE80211_STA_RX_BW_20;
2427 else
2428 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
ec61cd63 2429
e1a0c6b3 2430 if (rx->sta->sta.bandwidth == new_bw)
ec61cd63
JB		 2431 goto handled;
2432
ec61cd63
JB		 2433 sband = rx->local->hw.wiphy->bands[status->band];
2434
2435 rate_control_rate_update(local, sband, rx->sta,
2436 IEEE80211_RC_BW_CHANGED);
2437 goto handled;
2438 }
1d8d3dec
JB		 2439 default:
2440 goto invalid;
2441 }
2442
0af83d3d 2443 break;
1b3a2e49
JB		 2444 case WLAN_CATEGORY_PUBLIC:
2445 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2446 goto invalid;
2447 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2448 break;
2449 if (!rx->sta)
2450 break;
2451 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2452 break;
2453 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2454 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2455 break;
2456 if (len < offsetof(struct ieee80211_mgmt,
2457 u.action.u.ext_chan_switch.variable))
2458 goto invalid;
2459 goto queue;
0af83d3d
JB		 2460 case WLAN_CATEGORY_VHT:
2461 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2462 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2463 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2464 sdata->vif.type != NL80211_IFTYPE_AP &&
2465 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2466 break;
2467
2468 /* verify action code is present */
2469 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2470 goto invalid;
2471
2472 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2473 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2474 u8 opmode;
2475
2476 /* verify opmode is present */
2477 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2478 goto invalid;
2479
2480 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2481
2482 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
bee7f586
JB		 2483 opmode, status->band,
2484 false);
0af83d3d
JB		 2485 goto handled;
2486 }
2487 default:
2488 break;
2489 }
1d8d3dec 2490 break;
de1ede7a 2491 case WLAN_CATEGORY_BACK:
8abd3f9b 2492 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2493 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2494 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2495 sdata->vif.type != NL80211_IFTYPE_AP &&
2496 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2497 break;
8abd3f9b 2498
026331c4
JM		 2499 /* verify action_code is present */
2500 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2501 break;
2502
de1ede7a
JB		 2503 switch (mgmt->u.action.u.addba_req.action_code) {
2504 case WLAN_ACTION_ADDBA_REQ:
2505 if (len < (IEEE80211_MIN_ACTION_SIZE +
2506 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2507 goto invalid;
2508 break;
de1ede7a
JB		 2509 case WLAN_ACTION_ADDBA_RESP:
2510 if (len < (IEEE80211_MIN_ACTION_SIZE +
2511 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2512 goto invalid;
2513 break;
de1ede7a
JB		 2514 case WLAN_ACTION_DELBA:
2515 if (len < (IEEE80211_MIN_ACTION_SIZE +
2516 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2517 goto invalid;
2518 break;
2519 default:
2520 goto invalid;
de1ede7a 2521 }
bed7ee6e 2522
8b58ff83 2523 goto queue;
39192c0b 2524 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2525 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2526 break;
46900298
JB		 2527
2528 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2529 break;
46900298 2530
026331c4
JM		 2531 /* verify action_code is present */
2532 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2533 break;
2534
39192c0b
JB		 2535 switch (mgmt->u.action.u.measurement.action_code) {
2536 case WLAN_ACTION_SPCT_MSR_REQ:
2537 if (len < (IEEE80211_MIN_ACTION_SIZE +
2538 sizeof(mgmt->u.action.u.measurement)))
84040805 2539 break;
39192c0b 2540 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2541 goto handled;
c481ec97 2542 case WLAN_ACTION_SPCT_CHL_SWITCH:
cc32abd4 2543 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2544 break;
cc32abd4 2545
b203ca39 2546 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2547 break;
c481ec97 2548
8b58ff83 2549 goto queue;
39192c0b
JB		 2550 }
2551 break;
fea14732
JM		 2552 case WLAN_CATEGORY_SA_QUERY:
2553 if (len < (IEEE80211_MIN_ACTION_SIZE +
2554 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2555 break;
2556
fea14732
JM		 2557 switch (mgmt->u.action.u.sa_query.action) {
2558 case WLAN_ACTION_SA_QUERY_REQUEST:
2559 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2560 break;
fea14732 2561 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2562 goto handled;
fea14732
JM		 2563 }
2564 break;
8db09850 2565 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2566 if (len < (IEEE80211_MIN_ACTION_SIZE +
2567 sizeof(mgmt->u.action.u.self_prot.action_code)))
2568 break;
2569
8db09850
TP		 2570 switch (mgmt->u.action.u.self_prot.action_code) {
2571 case WLAN_SP_MESH_PEERING_OPEN:
2572 case WLAN_SP_MESH_PEERING_CLOSE:
2573 case WLAN_SP_MESH_PEERING_CONFIRM:
2574 if (!ieee80211_vif_is_mesh(&sdata->vif))
2575 goto invalid;
a6dad6a2 2576 if (sdata->u.mesh.user_mpm)
8db09850
TP		 2577 /* userspace handles this frame */
2578 break;
2579 goto queue;
2580 case WLAN_SP_MGK_INFORM:
2581 case WLAN_SP_MGK_ACK:
2582 if (!ieee80211_vif_is_mesh(&sdata->vif))
2583 goto invalid;
2584 break;
2585 }
2586 break;
d3aaec8a 2587 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2588 if (len < (IEEE80211_MIN_ACTION_SIZE +
2589 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2590 break;
2591
77a121c3
JB		 2592 if (!ieee80211_vif_is_mesh(&sdata->vif))
2593 break;
25d49e4d 2594 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2595 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2596 break;
2597 goto queue;
84040805 2598 }
026331c4 2599
2e161f78
JB		 2600 return RX_CONTINUE;
2601
bed7ee6e 2602 invalid:
554891e6 2603 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2604 /* will return in the next handlers */
2605 return RX_CONTINUE;
2606
2607 handled:
2608 if (rx->sta)
2609 rx->sta->rx_packets++;
2610 dev_kfree_skb(rx->skb);
2611 return RX_QUEUED;
2612
2613 queue:
2614 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2615 skb_queue_tail(&sdata->skb_queue, rx->skb);
2616 ieee80211_queue_work(&local->hw, &sdata->work);
2617 if (rx->sta)
2618 rx->sta->rx_packets++;
2619 return RX_QUEUED;
2620}
2621
2622static ieee80211_rx_result debug_noinline
2623ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2624{
554891e6 2625 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2626 int sig = 0;
2e161f78
JB		 2627
2628 /* skip known-bad action frames and return them in the next handler */
554891e6 2629 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2630 return RX_CONTINUE;
d7907448 2631
026331c4
JM		 2632 /*
2633 * Getting here means the kernel doesn't know how to handle
2634 * it, but maybe userspace does ... include returned frames
2635 * so userspace can register for those to know whether ones
2636 * it transmitted were processed or returned.
2637 */
026331c4 2638
804483e9
JB		 2639 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2640 sig = status->signal;
2641
71bbc994 2642 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2643 rx->skb->data, rx->skb->len,
2644 GFP_ATOMIC)) {
2645 if (rx->sta)
2646 rx->sta->rx_packets++;
2647 dev_kfree_skb(rx->skb);
2648 return RX_QUEUED;
2649 }
2650
2e161f78
JB		 2651 return RX_CONTINUE;
2652}
2653
2654static ieee80211_rx_result debug_noinline
2655ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2656{
2657 struct ieee80211_local *local = rx->local;
2658 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2659 struct sk_buff *nskb;
2660 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2661 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2662
2663 if (!ieee80211_is_action(mgmt->frame_control))
2664 return RX_CONTINUE;
2665
2666 /*
2667 * For AP mode, hostapd is responsible for handling any action
2668 * frames that we didn't handle, including returning unknown
2669 * ones. For all other modes we will return them to the sender,
2670 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2671 * 802.11-2012 9.24.4.
2e161f78
JB		 2672 * Newer versions of hostapd shall also use the management frame
2673 * registration mechanisms, but older ones still use cooked
2674 * monitor interfaces so push all frames there.
2675 */
554891e6 2676 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2677 (sdata->vif.type == NL80211_IFTYPE_AP ||
2678 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2679 return RX_DROP_MONITOR;
026331c4 2680
4b5ebccc
JB		 2681 if (is_multicast_ether_addr(mgmt->da))
2682 return RX_DROP_MONITOR;
2683
84040805
JB		 2684 /* do not return rejected action frames */
2685 if (mgmt->u.action.category & 0x80)
2686 return RX_DROP_UNUSABLE;
2687
2688 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2689 GFP_ATOMIC);
2690 if (nskb) {
292b4df6 2691 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2692
292b4df6
JL		 2693 nmgmt->u.action.category |= 0x80;
2694 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2695 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2696
2697 memset(nskb->cb, 0, sizeof(nskb->cb));
2698
07e5a5f5
JB		 2699 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2701
2702 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2703 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2704 IEEE80211_TX_CTL_NO_CCK_RATE;
2705 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
2706 info->hw_queue =
2707 local->hw.offchannel_tx_hw_queue;
2708 }
2709
2710 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2711 status->band);
de1ede7a 2712 }
39192c0b
JB		 2713 dev_kfree_skb(rx->skb);
2714 return RX_QUEUED;
de1ede7a
JB		 2715}
2716
49461622 2717static ieee80211_rx_result debug_noinline
5cf121c3 2718ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2719{
eb9fb5b8 2720 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2721 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2722 __le16 stype;
571ecf67 2723
77a121c3 2724 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2725
77a121c3
JB		 2726 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2727 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2728 sdata->vif.type != NL80211_IFTYPE_STATION)
2729 return RX_DROP_MONITOR;
472dbc45 2730
77a121c3 2731 switch (stype) {
66e67e41 2732 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2733 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2734 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2735 /* process for all: mesh, mlme, ibss */
2736 break;
66e67e41
JB		 2737 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2738 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2739 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2740 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2741 if (is_multicast_ether_addr(mgmt->da) &&
2742 !is_broadcast_ether_addr(mgmt->da))
2743 return RX_DROP_MONITOR;
2744
77a121c3
JB		 2745 /* process only for station */
2746 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2747 return RX_DROP_MONITOR;
2748 break;
2749 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
9fb04b50
TP		 2750 /* process only for ibss and mesh */
2751 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2752 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
77a121c3
JB		 2753 return RX_DROP_MONITOR;
2754 break;
2755 default:
2756 return RX_DROP_MONITOR;
2757 }
f9d540ee 2758
77a121c3 2759 /* queue up frame and kick off work to process it */
c1475ca9 2760 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2761 skb_queue_tail(&sdata->skb_queue, rx->skb);
2762 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2763 if (rx->sta)
2764 rx->sta->rx_packets++;
46900298 2765
77a121c3 2766 return RX_QUEUED;
571ecf67
JB		 2767}
2768
5cf121c3 2769/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2770static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2771 struct ieee80211_rate *rate)
3d30d949
MW		 2772{
2773 struct ieee80211_sub_if_data *sdata;
2774 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2775 struct sk_buff *skb = rx->skb, *skb2;
2776 struct net_device *prev_dev = NULL;
eb9fb5b8 2777 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2778 int needed_headroom;
3d30d949 2779
554891e6
JB		 2780 /*
2781 * If cooked monitor has been processed already, then
2782 * don't do it again. If not, set the flag.
2783 */
2784 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2785 goto out_free_skb;
554891e6 2786 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2787
152c477a
JB		 2788 /* If there are no cooked monitor interfaces, just free the SKB */
2789 if (!local->cooked_mntrs)
2790 goto out_free_skb;
2791
293702a3 2792 /* room for the radiotap header based on driver features */
90b9e446 2793 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2794
293702a3
JB		 2795 if (skb_headroom(skb) < needed_headroom &&
2796 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2797 goto out_free_skb;
3d30d949 2798
293702a3 2799 /* prepend radiotap information */
973ef21a
FF		 2800 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2801 false);
3d30d949
MW		 2802
2803 skb_set_mac_header(skb, 0);
2804 skb->ip_summed = CHECKSUM_UNNECESSARY;
2805 skb->pkt_type = PACKET_OTHERHOST;
2806 skb->protocol = htons(ETH_P_802_2);
2807
2808 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2809 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2810 continue;
2811
05c914fe 2812 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2813 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2814 continue;
2815
2816 if (prev_dev) {
2817 skb2 = skb_clone(skb, GFP_ATOMIC);
2818 if (skb2) {
2819 skb2->dev = prev_dev;
5548a8a1 2820 netif_receive_skb(skb2);
3d30d949
MW		 2821 }
2822 }
2823
2824 prev_dev = sdata->dev;
2825 sdata->dev->stats.rx_packets++;
2826 sdata->dev->stats.rx_bytes += skb->len;
2827 }
2828
2829 if (prev_dev) {
2830 skb->dev = prev_dev;
5548a8a1 2831 netif_receive_skb(skb);
554891e6
JB		 2832 return;
2833 }
3d30d949
MW		 2834
2835 out_free_skb:
2836 dev_kfree_skb(skb);
2837}
2838
aa0c8636
CL		 2839static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2840 ieee80211_rx_result res)
2841{
2842 switch (res) {
2843 case RX_DROP_MONITOR:
2844 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2845 if (rx->sta)
2846 rx->sta->rx_dropped++;
2847 /* fall through */
2848 case RX_CONTINUE: {
2849 struct ieee80211_rate *rate = NULL;
2850 struct ieee80211_supported_band *sband;
2851 struct ieee80211_rx_status *status;
2852
2853 status = IEEE80211_SKB_RXCB((rx->skb));
2854
2855 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2856 if (!(status->flag & RX_FLAG_HT) &&
2857 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2858 rate = &sband->bitrates[status->rate_idx];
2859
2860 ieee80211_rx_cooked_monitor(rx, rate);
2861 break;
2862 }
2863 case RX_DROP_UNUSABLE:
2864 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2865 if (rx->sta)
2866 rx->sta->rx_dropped++;
2867 dev_kfree_skb(rx->skb);
2868 break;
2869 case RX_QUEUED:
2870 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2871 break;
2872 }
2873}
571ecf67 2874
f9e124fb
CL		 2875static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2876 struct sk_buff_head *frames)
58905290 2877{
58905290 2878 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2879 struct sk_buff *skb;
8944b79f 2880
e32f85f7
LCC		 2881#define CALL_RXH(rxh) \
2882 do { \
2883 res = rxh(rx); \
2884 if (res != RX_CONTINUE) \
2569a826 2885 goto rxh_next; \
e32f85f7 2886 } while (0);
49461622 2887
f9e124fb 2888 spin_lock_bh(&rx->local->rx_path_lock);
24a8fdad 2889
f9e124fb 2890 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2891 /*
2892 * all the other fields are valid across frames
2893 * that belong to an aMPDU since they are on the
2894 * same TID from the same station
2895 */
2896 rx->skb = skb;
2897
2898 CALL_RXH(ieee80211_rx_h_decrypt)
2899 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2900 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2901 CALL_RXH(ieee80211_rx_h_sta_process)
2902 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2903 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2904 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2905#ifdef CONFIG_MAC80211_MESH
aa0c8636 2906 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2907 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2908#endif
2154c81c 2909 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2910 CALL_RXH(ieee80211_rx_h_data)
f9e124fb
CL		 2911
2912 /* special treatment -- needs the queue */
2913 res = ieee80211_rx_h_ctrl(rx, frames);
2914 if (res != RX_CONTINUE)
2915 goto rxh_next;
2916
2e161f78 2917 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2918 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2919 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2920 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2921 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2922
aa0c8636
CL		 2923 rxh_next:
2924 ieee80211_rx_handlers_result(rx, res);
f9e124fb 2925
49461622 2926#undef CALL_RXH
aa0c8636 2927 }
24a8fdad 2928
f9e124fb 2929 spin_unlock_bh(&rx->local->rx_path_lock);
aa0c8636
CL		 2930}
2931
4406c376 2932static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2933{
f9e124fb 2934 struct sk_buff_head reorder_release;
aa0c8636
CL		 2935 ieee80211_rx_result res = RX_DROP_MONITOR;
2936
f9e124fb
CL		 2937 __skb_queue_head_init(&reorder_release);
2938
aa0c8636
CL		 2939#define CALL_RXH(rxh) \
2940 do { \
2941 res = rxh(rx); \
2942 if (res != RX_CONTINUE) \
2943 goto rxh_next; \
2944 } while (0);
2945
aa0c8636
CL		 2946 CALL_RXH(ieee80211_rx_h_check)
2947
f9e124fb 2948 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
aa0c8636 2949
f9e124fb 2950 ieee80211_rx_handlers(rx, &reorder_release);
aa0c8636 2951 return;
49461622 2952
2569a826 2953 rxh_next:
aa0c8636
CL		 2954 ieee80211_rx_handlers_result(rx, res);
2955
2956#undef CALL_RXH
58905290
JB		 2957}
2958
2bff8ebf 2959/*
dd318575
JB		 2960 * This function makes calls into the RX path, therefore
2961 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2962 */
2963void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2964{
f9e124fb 2965 struct sk_buff_head frames;
554891e6
JB		 2966 struct ieee80211_rx_data rx = {
2967 .sta = sta,
2968 .sdata = sta->sdata,
2969 .local = sta->local,
9e26297a
JB		 2970 /* This is OK -- must be QoS data frame */
2971 .security_idx = tid,
2972 .seqno_idx = tid,
fcf8bd3b 2973 .flags = 0,
554891e6 2974 };
2c15a0cf
CL		 2975 struct tid_ampdu_rx *tid_agg_rx;
2976
2977 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2978 if (!tid_agg_rx)
2979 return;
2bff8ebf 2980
f9e124fb
CL		 2981 __skb_queue_head_init(&frames);
2982
2c15a0cf 2983 spin_lock(&tid_agg_rx->reorder_lock);
f9e124fb 2984 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
2c15a0cf 2985 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2986
f9e124fb 2987 ieee80211_rx_handlers(&rx, &frames);
2bff8ebf
CL		 2988}
2989
571ecf67
JB		 2990/* main receive path */
2991
20b01f80 2992static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2993 struct ieee80211_hdr *hdr)
2994{
20b01f80 2995 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2996 struct sk_buff *skb = rx->skb;
2997 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2998 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2999 int multicast = is_multicast_ether_addr(hdr->addr1);
3000
51fb61e7 3001 switch (sdata->vif.type) {
05c914fe 3002 case NL80211_IFTYPE_STATION:
9bc383de 3003 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 3004 return 0;
77fdaa12 3005 if (!multicast &&
b203ca39 3006 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 3007 if (!(sdata->dev->flags & IFF_PROMISC) ||
3008 sdata->u.mgd.use_4addr)
23a24def 3009 return 0;
554891e6 3010 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 3011 }
3012 break;
05c914fe 3013 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 3014 if (!bssid)
3015 return 0;
d7da0fc7
FF		 3016 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3017 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
3018 return 0;
a7767f95 3019 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 3020 return 1;
d48b2968
JB		 3021 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
3022 return 0;
23a24def 3023 } else if (!multicast &&
b203ca39 3024 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 3025 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 3026 return 0;
554891e6 3027 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 3028 } else if (!rx->sta) {
3029 int rate_idx;
5614618e
JB		 3030 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3031 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 3032 else
eb9fb5b8 3033 rate_idx = status->rate_idx;
8bf11d8d
JB		 3034 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3035 BIT(rate_idx));
0fb8ca45 3036 }
23a24def 3037 break;
05c914fe 3038 case NL80211_IFTYPE_MESH_POINT:
6032f934 3039 if (!multicast &&
b203ca39 3040 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 3041 if (!(sdata->dev->flags & IFF_PROMISC))
3042 return 0;
3043
554891e6 3044 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 3045 }
3046 break;
05c914fe
JB		 3047 case NL80211_IFTYPE_AP_VLAN:
3048 case NL80211_IFTYPE_AP:
23a24def 3049 if (!bssid) {
b203ca39 3050 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 3051 return 0;
f142c6b9 3052 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 3053 /*
3054 * Accept public action frames even when the
3055 * BSSID doesn't match, this is used for P2P
3056 * and location updates. Note that mac80211
3057 * itself never looks at these frames.
3058 */
2b9ccd4e
JB		 3059 if (!multicast &&
3060 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
3061 return 0;
d48b2968 3062 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 3063 return 1;
d48b2968 3064 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 3065 return 0;
554891e6 3066 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 3067 }
23a24def 3068 break;
05c914fe 3069 case NL80211_IFTYPE_WDS:
a7767f95 3070 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 3071 return 0;
b203ca39 3072 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 3073 return 0;
3074 break;
f142c6b9
JB		 3075 case NL80211_IFTYPE_P2P_DEVICE:
3076 if (!ieee80211_is_public_action(hdr, skb->len) &&
3077 !ieee80211_is_probe_req(hdr->frame_control) &&
3078 !ieee80211_is_probe_resp(hdr->frame_control) &&
3079 !ieee80211_is_beacon(hdr->frame_control))
3080 return 0;
1b737f88
JB		 3081 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1) &&
3082 !multicast)
f142c6b9
JB		 3083 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
3084 break;
2ca27bcf 3085 default:
fb1c1cd6 3086 /* should never get here */
f142c6b9 3087 WARN_ON_ONCE(1);
fb1c1cd6 3088 break;
23a24def
JB		 3089 }
3090
3091 return 1;
3092}
3093
4406c376
JB		 3094/*
3095 * This function returns whether or not the SKB
3096 * was destined for RX processing or not, which,
3097 * if consume is true, is equivalent to whether
3098 * or not the skb was consumed.
3099 */
3100static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3101 struct sk_buff *skb, bool consume)
3102{
3103 struct ieee80211_local *local = rx->local;
3104 struct ieee80211_sub_if_data *sdata = rx->sdata;
3105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3106 struct ieee80211_hdr *hdr = (void *)skb->data;
3107 int prepares;
3108
3109 rx->skb = skb;
554891e6 3110 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 3111 prepares = prepare_for_handlers(rx, hdr);
3112
3113 if (!prepares)
3114 return false;
3115
4406c376
JB		 3116 if (!consume) {
3117 skb = skb_copy(skb, GFP_ATOMIC);
3118 if (!skb) {
3119 if (net_ratelimit())
3120 wiphy_debug(local->hw.wiphy,
b305dae4 3121 "failed to copy skb for %s\n",
4406c376
JB		 3122 sdata->name);
3123 return true;
3124 }
3125
3126 rx->skb = skb;
3127 }
3128
3129 ieee80211_invoke_rx_handlers(rx);
3130 return true;
3131}
3132
571ecf67 3133/*
6368e4b1
RR		 3134 * This is the actual Rx frames handler. as it blongs to Rx path it must
3135 * be called with rcu_read_lock protection.
571ecf67 3136 */
71ebb4aa 3137static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 3138 struct sk_buff *skb)
571ecf67
JB		 3139{
3140 struct ieee80211_local *local = hw_to_local(hw);
3141 struct ieee80211_sub_if_data *sdata;
571ecf67 3142 struct ieee80211_hdr *hdr;
e3cf8b3f 3143 __le16 fc;
5cf121c3 3144 struct ieee80211_rx_data rx;
4406c376 3145 struct ieee80211_sub_if_data *prev;
56af3268 3146 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 3147 int err = 0;
571ecf67 3148
e3cf8b3f 3149 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 3150 memset(&rx, 0, sizeof(rx));
3151 rx.skb = skb;
3152 rx.local = local;
72abd81b 3153
e3cf8b3f 3154 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3155 local->dot11ReceivedFragmentCount++;
571ecf67 3156
4a4f1a58
JB		 3157 if (ieee80211_is_mgmt(fc)) {
3158 /* drop frame if too short for header */
3159 if (skb->len < ieee80211_hdrlen(fc))
3160 err = -ENOBUFS;
3161 else
3162 err = skb_linearize(skb);
3163 } else {
e3cf8b3f 3164 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3165 }
e3cf8b3f
ZY		 3166
3167 if (err) {
3168 dev_kfree_skb(skb);
3169 return;
3170 }
3171
3172 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3173 ieee80211_parse_qos(&rx);
d1c3a37c 3174 ieee80211_verify_alignment(&rx);
38f3714d 3175
d48b2968
JB		 3176 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3177 ieee80211_is_beacon(hdr->frame_control)))
3178 ieee80211_scan_rx(local, skb);
3179
e3cf8b3f 3180 if (ieee80211_is_data(fc)) {
56af3268 3181 prev_sta = NULL;
4406c376 3182
7852e361 3183 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3184 if (!prev_sta) {
3185 prev_sta = sta;
3186 continue;
3187 }
3188
3189 rx.sta = prev_sta;
3190 rx.sdata = prev_sta->sdata;
4406c376 3191 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3192
56af3268 3193 prev_sta = sta;
4406c376 3194 }
56af3268
BG		 3195
3196 if (prev_sta) {
3197 rx.sta = prev_sta;
3198 rx.sdata = prev_sta->sdata;
3199
4406c376 3200 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3201 return;
8e26d5ad 3202 goto out;
56af3268 3203 }
4406c376
JB		 3204 }
3205
4b0dd98e 3206 prev = NULL;
b2e7771e 3207
4b0dd98e
JB		 3208 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3209 if (!ieee80211_sdata_running(sdata))
3210 continue;
340e11f3 3211
4b0dd98e
JB		 3212 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3213 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3214 continue;
340e11f3 3215
4b0dd98e
JB		 3216 /*
3217 * frame is destined for this interface, but if it's
3218 * not also for the previous one we handle that after
3219 * the loop to avoid copying the SKB once too much
3220 */
4bb29f8c 3221
4b0dd98e 3222 if (!prev) {
abe60632 3223 prev = sdata;
4b0dd98e 3224 continue;
340e11f3 3225 }
4bb29f8c 3226
7852e361 3227 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3228 rx.sdata = prev;
3229 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3230
4b0dd98e
JB		 3231 prev = sdata;
3232 }
3233
3234 if (prev) {
7852e361 3235 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3236 rx.sdata = prev;
4406c376 3237
4b0dd98e
JB		 3238 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3239 return;
571ecf67 3240 }
4406c376 3241
8e26d5ad 3242 out:
4406c376 3243 dev_kfree_skb(skb);
571ecf67 3244}
6368e4b1
RR		 3245
3246/*
3247 * This is the receive path handler. It is called by a low level driver when an
3248 * 802.11 MPDU is received from the hardware.
3249 */
103bf9f7 3250void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3251{
3252 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3253 struct ieee80211_rate *rate = NULL;
3254 struct ieee80211_supported_band *sband;
f1d58c25 3255 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3256
d20ef63d
JB		 3257 WARN_ON_ONCE(softirq_count() == 0);
3258
444e3803 3259 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3260 goto drop;
8318d78a
JB		 3261
3262 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3263 if (WARN_ON(!sband))
3264 goto drop;
8318d78a 3265
89c3a8ac
JB		 3266 /*
3267 * If we're suspending, it is possible although not too likely
3268 * that we'd be receiving frames after having already partially
3269 * quiesced the stack. We can't process such frames then since
3270 * that might, for example, cause stations to be added or other
3271 * driver callbacks be invoked.
3272 */
77a980dc
JB		 3273 if (unlikely(local->quiescing || local->suspended))
3274 goto drop;
89c3a8ac 3275
04800ada
AN		 3276 /* We might be during a HW reconfig, prevent Rx for the same reason */
3277 if (unlikely(local->in_reconfig))
3278 goto drop;
3279
ea77f12f
JB		 3280 /*
3281 * The same happens when we're not even started,
3282 * but that's worth a warning.
3283 */
77a980dc
JB		 3284 if (WARN_ON(!local->started))
3285 goto drop;
ea77f12f 3286
fc885189 3287 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3288 /*
fc885189
JB		 3289 * Validate the rate, unless a PLCP error means that
3290 * we probably can't have a valid rate here anyway.
e5d6eb83 3291 */
fc885189
JB		 3292
3293 if (status->flag & RX_FLAG_HT) {
3294 /*
3295 * rate_idx is MCS index, which can be [0-76]
3296 * as documented on:
3297 *
3298 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3299 *
3300 * Anything else would be some sort of driver or
3301 * hardware error. The driver should catch hardware
3302 * errors.
3303 */
444e3803 3304 if (WARN(status->rate_idx > 76,
fc885189
JB		 3305 "Rate marked as an HT rate but passed "
3306 "status->rate_idx is not "
3307 "an MCS index [0-76]: %d (0x%02x)\n",
3308 status->rate_idx,
3309 status->rate_idx))
3310 goto drop;
5614618e
JB		 3311 } else if (status->flag & RX_FLAG_VHT) {
3312 if (WARN_ONCE(status->rate_idx > 9 ||
3313 !status->vht_nss ||
3314 status->vht_nss > 8,
3315 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3316 status->rate_idx, status->vht_nss))
3317 goto drop;
fc885189 3318 } else {
444e3803 3319 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3320 goto drop;
3321 rate = &sband->bitrates[status->rate_idx];
3322 }
0fb8ca45 3323 }
6368e4b1 3324
554891e6
JB		 3325 status->rx_flags = 0;
3326
6368e4b1
RR		 3327 /*
3328 * key references and virtual interfaces are protected using RCU
3329 * and this requires that we are in a read-side RCU section during
3330 * receive processing
3331 */
3332 rcu_read_lock();
3333
3334 /*
3335 * Frames with failed FCS/PLCP checksum are not returned,
3336 * all other frames are returned without radiotap header
3337 * if it was previously present.
3338 * Also, frames with less than 16 bytes are dropped.
3339 */
f1d58c25 3340 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3341 if (!skb) {
3342 rcu_read_unlock();
3343 return;
3344 }
3345
e1e54068
JB		 3346 ieee80211_tpt_led_trig_rx(local,
3347 ((struct ieee80211_hdr *)skb->data)->frame_control,
3348 skb->len);
071d9ac2 3349 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3350
3351 rcu_read_unlock();
77a980dc
JB		 3352
3353 return;
3354 drop:
3355 kfree_skb(skb);
6368e4b1 3356}
103bf9f7 3357EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3358
3359/* This is a version of the rx handler that can be called from hard irq
3360 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3361void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3362{
3363 struct ieee80211_local *local = hw_to_local(hw);
3364
3365 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3366
571ecf67
JB		 3367 skb->pkt_type = IEEE80211_RX_MSG;
3368 skb_queue_tail(&local->skb_queue, skb);
3369 tasklet_schedule(&local->tasklet);
3370}
3371EXPORT_SYMBOL(ieee80211_rx_irqsafe);
kernel source for telekom puls (alcatel/mediatek)