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mac80211: support VHT association
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
90b9e446
JB		 43 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
44
b2e7771e
JB		 45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
e3cf8b3f 47 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
52 skb = NULL;
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
90b9e446
JB		 114 if (status->vendor_radiotap_len) {
115 if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
116 status->vendor_radiotap_align = 1;
117 /* align standard part of vendor namespace */
118 len = ALIGN(len, 2);
119 /* allocate standard part of vendor namespace */
120 len += 6;
121 /* align vendor-defined part */
122 len = ALIGN(len, status->vendor_radiotap_align);
123 /* vendor-defined part is already in skb */
124 }
125
601ae7f2
BR		 126 return len;
127}
128
00ea6deb 129/*
601ae7f2
BR		 130 * ieee80211_add_rx_radiotap_header - add radiotap header
131 *
132 * add a radiotap header containing all the fields which the hardware provided.
133 */
134static void
135ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
136 struct sk_buff *skb,
601ae7f2 137 struct ieee80211_rate *rate,
973ef21a 138 int rtap_len, bool has_fcs)
601ae7f2 139{
f1d58c25 140 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 141 struct ieee80211_radiotap_header *rthdr;
142 unsigned char *pos;
6a86b9c7 143 u16 rx_flags = 0;
f4bda337
TP		 144 int mpdulen;
145
146 mpdulen = skb->len;
147 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
148 mpdulen += FCS_LEN;
601ae7f2
BR		 149
150 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
151 memset(rthdr, 0, rtap_len);
152
153 /* radiotap header, set always present flags */
154 rthdr->it_present =
155 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 156 (1 << IEEE80211_RADIOTAP_CHANNEL) |
157 (1 << IEEE80211_RADIOTAP_ANTENNA) |
158 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
90b9e446 159 rthdr->it_len = cpu_to_le16(rtap_len + status->vendor_radiotap_len);
601ae7f2 160
1df332e8 161 pos = (unsigned char *)(rthdr + 1);
601ae7f2 162
90b9e446
JB		 163 if (status->vendor_radiotap_len) {
164 rthdr->it_present |=
165 cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) |
166 cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT));
167 put_unaligned_le32(status->vendor_radiotap_bitmap, pos);
168 pos += 4;
169 }
170
601ae7f2
BR		 171 /* the order of the following fields is important */
172
173 /* IEEE80211_RADIOTAP_TSFT */
f4bda337 174 if (ieee80211_have_rx_timestamp(status)) {
90b9e446
JB		 175 /* padding */
176 while ((pos - (u8 *)rthdr) & 7)
177 *pos++ = 0;
f4bda337
TP		 178 put_unaligned_le64(
179 ieee80211_calculate_rx_timestamp(local, status,
180 mpdulen, 0),
181 pos);
1df332e8 182 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 183 pos += 8;
184 }
185
186 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 187 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 188 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 189 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
190 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 191 if (status->flag & RX_FLAG_SHORTPRE)
192 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 193 pos++;
194
195 /* IEEE80211_RADIOTAP_RATE */
5614618e 196 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
0fb8ca45 197 /*
f8d1ccf1 198 * Without rate information don't add it. If we have,
38f37be2 199 * MCS information is a separate field in radiotap,
73b48099
JB		 200 * added below. The byte here is needed as padding
201 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 202 */
203 *pos = 0;
8d6f658e 204 } else {
ebe6c7ba 205 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 206 *pos = rate->bitrate / 5;
8d6f658e 207 }
601ae7f2
BR		 208 pos++;
209
210 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 211 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 212 pos += 2;
213 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 214 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
215 pos);
5614618e 216 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
5f0b7de5
JB		 217 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
218 pos);
f8d1ccf1 219 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 220 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
221 pos);
f8d1ccf1 222 else if (rate)
6a86b9c7
JB		 223 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
224 pos);
f8d1ccf1
JB		 225 else
226 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 227 pos += 2;
228
229 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 230 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
231 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 232 *pos = status->signal;
233 rthdr->it_present |=
234 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
235 pos++;
236 }
237
601ae7f2
BR		 238 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
239
240 /* IEEE80211_RADIOTAP_ANTENNA */
241 *pos = status->antenna;
242 pos++;
243
601ae7f2
BR		 244 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
245
246 /* IEEE80211_RADIOTAP_RX_FLAGS */
247 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 248 if ((pos - (u8 *)rthdr) & 1)
90b9e446 249 *pos++ = 0;
aae89831 250 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 251 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
252 put_unaligned_le16(rx_flags, pos);
601ae7f2 253 pos += 2;
6d744bac
JB		 254
255 if (status->flag & RX_FLAG_HT) {
256 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 257 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 258 *pos = 0;
259 if (status->flag & RX_FLAG_SHORT_GI)
260 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
261 if (status->flag & RX_FLAG_40MHZ)
262 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 263 if (status->flag & RX_FLAG_HT_GF)
264 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
6d744bac
JB		 265 pos++;
266 *pos++ = status->rate_idx;
267 }
4c298677
JB		 268
269 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
270 u16 flags = 0;
271
272 /* ensure 4 byte alignment */
273 while ((pos - (u8 *)rthdr) & 3)
274 pos++;
275 rthdr->it_present |=
276 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
277 put_unaligned_le32(status->ampdu_reference, pos);
278 pos += 4;
279 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
280 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
281 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
282 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
283 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
284 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
285 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
286 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
287 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
288 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
289 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
290 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
291 put_unaligned_le16(flags, pos);
292 pos += 2;
293 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
294 *pos++ = status->ampdu_delimiter_crc;
295 else
296 *pos++ = 0;
297 *pos++ = 0;
298 }
90b9e446
JB		 299
300 if (status->vendor_radiotap_len) {
301 /* ensure 2 byte alignment for the vendor field as required */
302 if ((pos - (u8 *)rthdr) & 1)
303 *pos++ = 0;
304 *pos++ = status->vendor_radiotap_oui[0];
305 *pos++ = status->vendor_radiotap_oui[1];
306 *pos++ = status->vendor_radiotap_oui[2];
307 *pos++ = status->vendor_radiotap_subns;
308 put_unaligned_le16(status->vendor_radiotap_len, pos);
309 pos += 2;
310 /* align the actual payload as requested */
311 while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1))
312 *pos++ = 0;
313 }
601ae7f2
BR		 314}
315
b2e7771e
JB		 316/*
317 * This function copies a received frame to all monitor interfaces and
318 * returns a cleaned-up SKB that no longer includes the FCS nor the
319 * radiotap header the driver might have added.
320 */
321static struct sk_buff *
322ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 323 struct ieee80211_rate *rate)
b2e7771e 324{
f1d58c25 325 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 326 struct ieee80211_sub_if_data *sdata;
293702a3 327 int needed_headroom;
b2e7771e
JB		 328 struct sk_buff *skb, *skb2;
329 struct net_device *prev_dev = NULL;
330 int present_fcs_len = 0;
b2e7771e
JB		 331
332 /*
333 * First, we may need to make a copy of the skb because
334 * (1) we need to modify it for radiotap (if not present), and
335 * (2) the other RX handlers will modify the skb we got.
336 *
337 * We don't need to, of course, if we aren't going to return
338 * the SKB because it has a bad FCS/PLCP checksum.
339 */
0869aea0
JB		 340
341 /* room for the radiotap header based on driver features */
90b9e446 342 needed_headroom = ieee80211_rx_radiotap_space(local, status);
b2e7771e
JB		 343
344 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
345 present_fcs_len = FCS_LEN;
346
605f1a5b
JB		 347 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
348 if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) {
e3cf8b3f
ZY		 349 dev_kfree_skb(origskb);
350 return NULL;
351 }
352
b2e7771e 353 if (!local->monitors) {
0869aea0 354 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 355 dev_kfree_skb(origskb);
356 return NULL;
357 }
358
0869aea0 359 return remove_monitor_info(local, origskb);
b2e7771e
JB		 360 }
361
0869aea0 362 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 363 /* only need to expand headroom if necessary */
364 skb = origskb;
365 origskb = NULL;
366
367 /*
368 * This shouldn't trigger often because most devices have an
369 * RX header they pull before we get here, and that should
370 * be big enough for our radiotap information. We should
371 * probably export the length to drivers so that we can have
372 * them allocate enough headroom to start with.
373 */
374 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 375 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 376 dev_kfree_skb(skb);
377 return NULL;
378 }
379 } else {
380 /*
381 * Need to make a copy and possibly remove radiotap header
382 * and FCS from the original.
383 */
384 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
385
0869aea0 386 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 387
388 if (!skb)
389 return origskb;
390 }
391
0869aea0 392 /* prepend radiotap information */
973ef21a
FF		 393 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
394 true);
b2e7771e 395
ce3edf6d 396 skb_reset_mac_header(skb);
b2e7771e
JB		 397 skb->ip_summed = CHECKSUM_UNNECESSARY;
398 skb->pkt_type = PACKET_OTHERHOST;
399 skb->protocol = htons(ETH_P_802_2);
400
401 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 402 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 403 continue;
404
3d30d949
MW		 405 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
406 continue;
407
9607e6b6 408 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 409 continue;
410
b2e7771e
JB		 411 if (prev_dev) {
412 skb2 = skb_clone(skb, GFP_ATOMIC);
413 if (skb2) {
414 skb2->dev = prev_dev;
5548a8a1 415 netif_receive_skb(skb2);
b2e7771e
JB		 416 }
417 }
418
419 prev_dev = sdata->dev;
420 sdata->dev->stats.rx_packets++;
421 sdata->dev->stats.rx_bytes += skb->len;
422 }
423
424 if (prev_dev) {
425 skb->dev = prev_dev;
5548a8a1 426 netif_receive_skb(skb);
b2e7771e
JB		 427 } else
428 dev_kfree_skb(skb);
429
430 return origskb;
431}
432
5cf121c3 433static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 434{
238f74a2 435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 436 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 437 int tid, seqno_idx, security_idx;
6e0d114d
JB		 438
439 /* does the frame have a qos control field? */
238f74a2
HH		 440 if (ieee80211_is_data_qos(hdr->frame_control)) {
441 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 442 /* frame has qos control */
238f74a2 443 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 444 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 445 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 446
447 seqno_idx = tid;
448 security_idx = tid;
6e0d114d 449 } else {
1411f9b5
JB		 450 /*
451 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
452 *
453 * Sequence numbers for management frames, QoS data
454 * frames with a broadcast/multicast address in the
455 * Address 1 field, and all non-QoS data frames sent
456 * by QoS STAs are assigned using an additional single
457 * modulo-4096 counter, [...]
458 *
459 * We also use that counter for non-QoS STAs.
460 */
5a306f58 461 seqno_idx = IEEE80211_NUM_TIDS;
9e26297a
JB		 462 security_idx = 0;
463 if (ieee80211_is_mgmt(hdr->frame_control))
5a306f58 464 security_idx = IEEE80211_NUM_TIDS;
9e26297a 465 tid = 0;
6e0d114d 466 }
52865dfd 467
9e26297a
JB		 468 rx->seqno_idx = seqno_idx;
469 rx->security_idx = security_idx;
6e0d114d
JB		 470 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
471 * For now, set skb->priority to 0 for other cases. */
472 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 473}
6e0d114d 474
d1c3a37c
JB		 475/**
476 * DOC: Packet alignment
477 *
478 * Drivers always need to pass packets that are aligned to two-byte boundaries
479 * to the stack.
480 *
481 * Additionally, should, if possible, align the payload data in a way that
482 * guarantees that the contained IP header is aligned to a four-byte
483 * boundary. In the case of regular frames, this simply means aligning the
484 * payload to a four-byte boundary (because either the IP header is directly
485 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 486 * in front of it). If the payload data is not properly aligned and the
487 * architecture doesn't support efficient unaligned operations, mac80211
488 * will align the data.
d1c3a37c
JB		 489 *
490 * With A-MSDU frames, however, the payload data address must yield two modulo
491 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
492 * push the IP header further back to a multiple of four again. Thankfully, the
493 * specs were sane enough this time around to require padding each A-MSDU
494 * subframe to a length that is a multiple of four.
495 *
25985edc 496 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 497 * the payload is not supported, the driver is required to move the 802.11
498 * header to be directly in front of the payload in that case.
499 */
500static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 501{
59d9cb07
KV		 502#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
503 WARN_ONCE((unsigned long)rx->skb->data & 1,
504 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 505#endif
6e0d114d
JB		 506}
507
6368e4b1 508
571ecf67
JB		 509/* rx handlers */
510
3cfcf6ac
JM		 511static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
512{
513 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
514
515 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
516 return 0;
517
518 return ieee80211_is_robust_mgmt_frame(hdr);
519}
520
521
522static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
523{
524 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
525
526 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
527 return 0;
528
529 return ieee80211_is_robust_mgmt_frame(hdr);
530}
531
532
533/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
534static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
535{
536 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
537 struct ieee80211_mmie *mmie;
538
1df332e8 539 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 540 return -1;
541
542 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
543 return -1; /* not a robust management frame */
544
545 mmie = (struct ieee80211_mmie *)
546 (skb->data + skb->len - sizeof(*mmie));
547 if (mmie->element_id != WLAN_EID_MMIE ||
548 mmie->length != sizeof(*mmie) - 2)
549 return -1;
550
551 return le16_to_cpu(mmie->key_id);
552}
553
1df332e8 554static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 555{
a7767f95 556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 557 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 558
a7767f95 559 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 560 if (is_multicast_ether_addr(hdr->addr1)) {
561 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 562 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 563 return RX_DROP_MONITOR;
b203ca39 564 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 565 return RX_DROP_MONITOR;
566 } else {
567 if (!ieee80211_has_a4(hdr->frame_control))
568 return RX_DROP_MONITOR;
b203ca39 569 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 570 return RX_DROP_MONITOR;
571 }
33b64eb2
LCC		 572 }
573
574 /* If there is not an established peer link and this is not a peer link
575 * establisment frame, beacon or probe, drop the frame.
576 */
577
57cf8043 578 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 579 struct ieee80211_mgmt *mgmt;
d6d1a5a7 580
a7767f95 581 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 582 return RX_DROP_MONITOR;
583
a7767f95 584 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 585 u8 category;
9b395bc3
JB		 586
587 /* make sure category field is present */
588 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
589 return RX_DROP_MONITOR;
590
33b64eb2 591 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 592 category = mgmt->u.action.category;
593 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 594 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 595 return RX_DROP_MONITOR;
33b64eb2 596 return RX_CONTINUE;
33b64eb2
LCC		 597 }
598
a7767f95
HH		 599 if (ieee80211_is_probe_req(hdr->frame_control) ||
600 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 601 ieee80211_is_beacon(hdr->frame_control) ||
602 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 603 return RX_CONTINUE;
604
605 return RX_DROP_MONITOR;
a7767f95
HH		 606 }
607
902acc78
JB		 608 return RX_CONTINUE;
609}
33b64eb2 610
1edfb1af
JB		 611#define SEQ_MODULO 0x1000
612#define SEQ_MASK 0xfff
613
614static inline int seq_less(u16 sq1, u16 sq2)
615{
616 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
617}
618
619static inline u16 seq_inc(u16 sq)
620{
621 return (sq + 1) & SEQ_MASK;
622}
623
624static inline u16 seq_sub(u16 sq1, u16 sq2)
625{
626 return (sq1 - sq2) & SEQ_MASK;
627}
628
d3b2fb53 629static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 630 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 631 int index)
1edfb1af 632{
d3b2fb53 633 struct ieee80211_local *local = sdata->local;
1edfb1af 634 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 635 struct ieee80211_rx_status *status;
1edfb1af 636
dd318575
JB		 637 lockdep_assert_held(&tid_agg_rx->reorder_lock);
638
1edfb1af
JB		 639 if (!skb)
640 goto no_frame;
641
071d9ac2 642 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 643 tid_agg_rx->stored_mpdu_num--;
644 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 645 status = IEEE80211_SKB_RXCB(skb);
646 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 647 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 648
649no_frame:
650 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
651}
652
d3b2fb53 653static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 654 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 655 u16 head_seq_num)
1edfb1af
JB		 656{
657 int index;
658
dd318575
JB		 659 lockdep_assert_held(&tid_agg_rx->reorder_lock);
660
1edfb1af
JB		 661 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
662 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
663 tid_agg_rx->buf_size;
d3b2fb53 664 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
1edfb1af
JB		 665 }
666}
667
668/*
669 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
670 * the skb was added to the buffer longer than this time ago, the earlier
671 * frames that have not yet been received are assumed to be lost and the skb
672 * can be released for processing. This may also release other skb's from the
673 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 674 *
675 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 676 */
677#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
678
d3b2fb53 679static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
24a8fdad 680 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 681{
2bff8ebf 682 int index, j;
aa0c8636 683
dd318575
JB		 684 lockdep_assert_held(&tid_agg_rx->reorder_lock);
685
aa0c8636
CL		 686 /* release the buffer until next missing frame */
687 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
688 tid_agg_rx->buf_size;
689 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 690 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 691 /*
692 * No buffers ready to be released, but check whether any
693 * frames in the reorder buffer have timed out.
694 */
aa0c8636
CL		 695 int skipped = 1;
696 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
697 j = (j + 1) % tid_agg_rx->buf_size) {
698 if (!tid_agg_rx->reorder_buf[j]) {
699 skipped++;
700 continue;
701 }
499fe9a4
DH		 702 if (skipped &&
703 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 704 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 705 goto set_release_timer;
aa0c8636 706
bdcbd8e0
JB		 707 ht_dbg_ratelimited(sdata,
708 "release an RX reorder frame due to timeout on earlier frames\n");
d3b2fb53 709 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
aa0c8636
CL		 710
711 /*
712 * Increment the head seq# also for the skipped slots.
713 */
714 tid_agg_rx->head_seq_num =
715 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
716 skipped = 0;
717 }
718 } else while (tid_agg_rx->reorder_buf[index]) {
d3b2fb53 719 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
aa0c8636
CL		 720 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
721 tid_agg_rx->buf_size;
722 }
2bff8ebf
CL		 723
724 if (tid_agg_rx->stored_mpdu_num) {
725 j = index = seq_sub(tid_agg_rx->head_seq_num,
726 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
727
728 for (; j != (index - 1) % tid_agg_rx->buf_size;
729 j = (j + 1) % tid_agg_rx->buf_size) {
730 if (tid_agg_rx->reorder_buf[j])
731 break;
732 }
733
734 set_release_timer:
735
736 mod_timer(&tid_agg_rx->reorder_timer,
334df731 737 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 738 HT_RX_REORDER_BUF_TIMEOUT);
739 } else {
740 del_timer(&tid_agg_rx->reorder_timer);
741 }
aa0c8636
CL		 742}
743
1edfb1af
JB		 744/*
745 * As this function belongs to the RX path it must be under
746 * rcu_read_lock protection. It returns false if the frame
747 * can be processed immediately, true if it was consumed.
748 */
d3b2fb53 749static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 750 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 751 struct sk_buff *skb)
1edfb1af
JB		 752{
753 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
754 u16 sc = le16_to_cpu(hdr->seq_ctrl);
755 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
756 u16 head_seq_num, buf_size;
757 int index;
2bff8ebf 758 bool ret = true;
1edfb1af 759
dd318575
JB		 760 spin_lock(&tid_agg_rx->reorder_lock);
761
1edfb1af
JB		 762 buf_size = tid_agg_rx->buf_size;
763 head_seq_num = tid_agg_rx->head_seq_num;
764
765 /* frame with out of date sequence number */
766 if (seq_less(mpdu_seq_num, head_seq_num)) {
767 dev_kfree_skb(skb);
2bff8ebf 768 goto out;
1edfb1af
JB		 769 }
770
771 /*
772 * If frame the sequence number exceeds our buffering window
773 * size release some previous frames to make room for this one.
774 */
775 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
776 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
777 /* release stored frames up to new head to stack */
d3b2fb53
JB		 778 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
779 head_seq_num);
1edfb1af
JB		 780 }
781
782 /* Now the new frame is always in the range of the reordering buffer */
783
784 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
785
786 /* check if we already stored this frame */
787 if (tid_agg_rx->reorder_buf[index]) {
788 dev_kfree_skb(skb);
2bff8ebf 789 goto out;
1edfb1af
JB		 790 }
791
792 /*
793 * If the current MPDU is in the right order and nothing else
794 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 795 * If it is first but there's something stored, we may be able
796 * to release frames after this one.
1edfb1af
JB		 797 */
798 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
799 tid_agg_rx->stored_mpdu_num == 0) {
800 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 801 ret = false;
802 goto out;
1edfb1af
JB		 803 }
804
805 /* put the frame in the reordering buffer */
806 tid_agg_rx->reorder_buf[index] = skb;
807 tid_agg_rx->reorder_time[index] = jiffies;
808 tid_agg_rx->stored_mpdu_num++;
d3b2fb53 809 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
1edfb1af 810
2bff8ebf
CL		 811 out:
812 spin_unlock(&tid_agg_rx->reorder_lock);
813 return ret;
1edfb1af
JB		 814}
815
816/*
817 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
818 * true if the MPDU was buffered, false if it should be processed.
819 */
24a8fdad 820static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 821{
2569a826
JB		 822 struct sk_buff *skb = rx->skb;
823 struct ieee80211_local *local = rx->local;
1edfb1af 824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 825 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 826 struct sta_info *sta = rx->sta;
1edfb1af
JB		 827 struct tid_ampdu_rx *tid_agg_rx;
828 u16 sc;
6cc00d54 829 u8 tid, ack_policy;
1edfb1af
JB		 830
831 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 832 goto dont_reorder;
1edfb1af
JB		 833
834 /*
835 * filter the QoS data rx stream according to
836 * STA/TID and check if this STA/TID is on aggregation
837 */
838
1edfb1af 839 if (!sta)
2569a826 840 goto dont_reorder;
1edfb1af 841
6cc00d54
TP		 842 ack_policy = *ieee80211_get_qos_ctl(hdr) &
843 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 844 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
845
a87f736d
JB		 846 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
847 if (!tid_agg_rx)
848 goto dont_reorder;
1edfb1af
JB		 849
850 /* qos null data frames are excluded */
851 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 852 goto dont_reorder;
1edfb1af 853
6cc00d54
TP		 854 /* not part of a BA session */
855 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
856 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
857 goto dont_reorder;
858
660c6a44
TP		 859 /* not actually part of this BA session */
860 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
861 goto dont_reorder;
862
1edfb1af
JB		 863 /* new, potentially un-ordered, ampdu frame - process it */
864
865 /* reset session timer */
866 if (tid_agg_rx->timeout)
12d3952f 867 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 868
869 /* if this mpdu is fragmented - terminate rx aggregation session */
870 sc = le16_to_cpu(hdr->seq_ctrl);
871 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 872 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 873 skb_queue_tail(&rx->sdata->skb_queue, skb);
874 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 875 return;
1edfb1af
JB		 876 }
877
a87f736d
JB		 878 /*
879 * No locking needed -- we will only ever process one
880 * RX packet at a time, and thus own tid_agg_rx. All
881 * other code manipulating it needs to (and does) make
882 * sure that we cannot get to it any more before doing
883 * anything with it.
884 */
d3b2fb53 885 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
2569a826
JB		 886 return;
887
888 dont_reorder:
24a8fdad 889 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 890}
33b64eb2 891
49461622 892static ieee80211_rx_result debug_noinline
5cf121c3 893ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 894{
a7767f95 895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 896 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 897
898 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
899 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 900 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 901 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 902 hdr->seq_ctrl)) {
554891e6 903 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 904 rx->local->dot11FrameDuplicateCount++;
905 rx->sta->num_duplicates++;
906 }
b1f93314 907 return RX_DROP_UNUSABLE;
571ecf67 908 } else
9e26297a 909 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 910 }
911
571ecf67
JB		 912 if (unlikely(rx->skb->len < 16)) {
913 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 914 return RX_DROP_MONITOR;
571ecf67
JB		 915 }
916
571ecf67
JB		 917 /* Drop disallowed frame classes based on STA auth/assoc state;
918 * IEEE 802.11, Chap 5.5.
919 *
ccd7b362
JB		 920 * mac80211 filters only based on association state, i.e. it drops
921 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 922 * deauth/disassoc frames when needed. In addition, hostapd is
923 * responsible for filtering on both auth and assoc states.
924 */
33b64eb2 925
902acc78 926 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 927 return ieee80211_rx_mesh_check(rx);
33b64eb2 928
a7767f95
HH		 929 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
930 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 931 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 932 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 933 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 934 /*
935 * accept port control frames from the AP even when it's not
936 * yet marked ASSOC to prevent a race where we don't set the
937 * assoc bit quickly enough before it sends the first frame
938 */
939 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 940 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 941 unsigned int hdrlen;
942 __be16 ethertype;
943
944 hdrlen = ieee80211_hdrlen(hdr->frame_control);
945
946 if (rx->skb->len < hdrlen + 8)
947 return RX_DROP_MONITOR;
948
949 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
950 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 951 return RX_CONTINUE;
952 }
21fc7560
JB		 953
954 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
955 cfg80211_rx_spurious_frame(rx->sdata->dev,
956 hdr->addr2,
957 GFP_ATOMIC))
958 return RX_DROP_UNUSABLE;
959
e4c26add 960 return RX_DROP_MONITOR;
2a33bee2 961 }
571ecf67 962
9ae54c84 963 return RX_CONTINUE;
570bd537
JB		 964}
965
966
49461622 967static ieee80211_rx_result debug_noinline
5cf121c3 968ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 969{
eb9fb5b8
JB		 970 struct sk_buff *skb = rx->skb;
971 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
972 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 973 int keyidx;
974 int hdrlen;
e4c26add 975 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 976 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 977 int mmie_keyidx = -1;
761ab470 978 __le16 fc;
570bd537 979
3017b80b
JB		 980 /*
981 * Key selection 101
982 *
3cfcf6ac 983 * There are four types of keys:
3017b80b 984 * - GTK (group keys)
3cfcf6ac 985 * - IGTK (group keys for management frames)
3017b80b
JB		 986 * - PTK (pairwise keys)
987 * - STK (station-to-station pairwise keys)
988 *
989 * When selecting a key, we have to distinguish between multicast
990 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 991 * use PTKs and STKs while the former always use GTKs and IGTKs.
992 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
993 * unicast frames can also use key indices like GTKs. Hence, if we
994 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 995 *
8dc06a1c
JB		 996 * Note that in a regular BSS, multicast frames are sent by the
997 * AP only, associated stations unicast the frame to the AP first
998 * which then multicasts it on their behalf.
999 *
3017b80b
JB		 1000 * There is also a slight problem in IBSS mode: GTKs are negotiated
1001 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 1002 * The spec seems to expect that one negotiates the same key with
1003 * every station but there's no such requirement; VLANs could be
1004 * possible.
3017b80b
JB		 1005 */
1006
3017b80b 1007 /*
1990af8d 1008 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 1009 * addressed to us nor a multicast frame.
1010 */
554891e6 1011 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1012 return RX_CONTINUE;
3017b80b 1013
2569a826
JB		 1014 /* start without a key */
1015 rx->key = NULL;
1016
d4e46a3d 1017 if (rx->sta)
e31b8213 1018 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 1019
761ab470
JB		 1020 fc = hdr->frame_control;
1021
1022 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 1023 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1024
e31b8213
JB		 1025 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1026 rx->key = sta_ptk;
dc1580dd
JB		 1027 if ((status->flag & RX_FLAG_DECRYPTED) &&
1028 (status->flag & RX_FLAG_IV_STRIPPED))
1029 return RX_CONTINUE;
0c7c10c7 1030 /* Skip decryption if the frame is not protected. */
761ab470 1031 if (!ieee80211_has_protected(fc))
0c7c10c7 1032 return RX_CONTINUE;
3cfcf6ac
JM		 1033 } else if (mmie_keyidx >= 0) {
1034 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 1035 if ((status->flag & RX_FLAG_DECRYPTED) &&
1036 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 1037 return RX_CONTINUE;
1038
1039 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1040 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1041 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 1042 if (rx->sta)
1043 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1044 if (!rx->key)
1045 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 1046 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 1047 /*
1048 * The frame was not protected, so skip decryption. However, we
1049 * need to set rx->key if there is a key that could have been
1050 * used so that the frame may be dropped if encryption would
1051 * have been expected.
1052 */
1053 struct ieee80211_key *key = NULL;
897bed8b
JB		 1054 struct ieee80211_sub_if_data *sdata = rx->sdata;
1055 int i;
1056
761ab470 1057 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1058 is_multicast_ether_addr(hdr->addr1) &&
1059 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1060 rx->key = key;
897bed8b
JB		 1061 else {
1062 if (rx->sta) {
1063 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1064 key = rcu_dereference(rx->sta->gtk[i]);
1065 if (key)
1066 break;
1067 }
1068 }
1069 if (!key) {
1070 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1071 key = rcu_dereference(sdata->keys[i]);
1072 if (key)
1073 break;
1074 }
1075 }
1076 if (key)
1077 rx->key = key;
1078 }
0c7c10c7 1079 return RX_CONTINUE;
571ecf67 1080 } else {
39184b15 1081 u8 keyid;
3017b80b
JB		 1082 /*
1083 * The device doesn't give us the IV so we won't be
1084 * able to look up the key. That's ok though, we
1085 * don't need to decrypt the frame, we just won't
1086 * be able to keep statistics accurate.
1087 * Except for key threshold notifications, should
1088 * we somehow allow the driver to tell us which key
1089 * the hardware used if this flag is set?
1090 */
eb9fb5b8
JB		 1091 if ((status->flag & RX_FLAG_DECRYPTED) &&
1092 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1093 return RX_CONTINUE;
3017b80b 1094
761ab470 1095 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1096
1097 if (rx->skb->len < 8 + hdrlen)
e4c26add 1098 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1099
1100 /*
1101 * no need to call ieee80211_wep_get_keyidx,
1102 * it verifies a bunch of things we've done already
1103 */
39184b15
ZY		 1104 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1105 keyidx = keyid >> 6;
3017b80b 1106
e31b8213
JB		 1107 /* check per-station GTK first, if multicast packet */
1108 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1109 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1110
e31b8213
JB		 1111 /* if not found, try default key */
1112 if (!rx->key) {
1113 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1114
1115 /*
1116 * RSNA-protected unicast frames should always be
1117 * sent with pairwise or station-to-station keys,
1118 * but for WEP we allow using a key index as well.
1119 */
1120 if (rx->key &&
1121 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1122 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1123 !is_multicast_ether_addr(hdr->addr1))
1124 rx->key = NULL;
1125 }
571ecf67
JB		 1126 }
1127
3017b80b 1128 if (rx->key) {
95acac61
JB		 1129 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1130 return RX_DROP_MONITOR;
1131
571ecf67 1132 rx->key->tx_rx_count++;
011bfcc4 1133 /* TODO: add threshold stuff again */
1990af8d 1134 } else {
e4c26add 1135 return RX_DROP_MONITOR;
70f08765
JB		 1136 }
1137
97359d12
JB		 1138 switch (rx->key->conf.cipher) {
1139 case WLAN_CIPHER_SUITE_WEP40:
1140 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1141 result = ieee80211_crypto_wep_decrypt(rx);
1142 break;
97359d12 1143 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1144 result = ieee80211_crypto_tkip_decrypt(rx);
1145 break;
97359d12 1146 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1147 result = ieee80211_crypto_ccmp_decrypt(rx);
1148 break;
97359d12 1149 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1150 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1151 break;
3ffc2a90
JB		 1152 default:
1153 /*
1154 * We can reach here only with HW-only algorithms
1155 * but why didn't it decrypt the frame?!
1156 */
1157 return RX_DROP_UNUSABLE;
70f08765
JB		 1158 }
1159
a8286911
JB		 1160 /* the hdr variable is invalid after the decrypt handlers */
1161
e2f036da 1162 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1163 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1164
1165 return result;
70f08765
JB		 1166}
1167
572e0012
KV		 1168static ieee80211_rx_result debug_noinline
1169ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1170{
1171 struct ieee80211_local *local;
1172 struct ieee80211_hdr *hdr;
1173 struct sk_buff *skb;
1174
1175 local = rx->local;
1176 skb = rx->skb;
1177 hdr = (struct ieee80211_hdr *) skb->data;
1178
1179 if (!local->pspolling)
1180 return RX_CONTINUE;
1181
1182 if (!ieee80211_has_fromds(hdr->frame_control))
1183 /* this is not from AP */
1184 return RX_CONTINUE;
1185
1186 if (!ieee80211_is_data(hdr->frame_control))
1187 return RX_CONTINUE;
1188
1189 if (!ieee80211_has_moredata(hdr->frame_control)) {
1190 /* AP has no more frames buffered for us */
1191 local->pspolling = false;
1192 return RX_CONTINUE;
1193 }
1194
1195 /* more data bit is set, let's request a new frame from the AP */
1196 ieee80211_send_pspoll(local, rx->sdata);
1197
1198 return RX_CONTINUE;
1199}
1200
d012a605 1201static void sta_ps_start(struct sta_info *sta)
571ecf67 1202{
133b8226 1203 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1204 struct ieee80211_local *local = sdata->local;
d012a605 1205 struct ps_data *ps;
0795af57 1206
d012a605
MP		 1207 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1208 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1209 ps = &sdata->bss->ps;
1210 else
1211 return;
1212
1213 atomic_inc(&ps->num_sta_ps);
c2c98fde 1214 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1215 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1216 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1217 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1218 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1219}
1220
d012a605 1221static void sta_ps_end(struct sta_info *sta)
571ecf67 1222{
bdcbd8e0
JB		 1223 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1224 sta->sta.addr, sta->sta.aid);
004c872e 1225
c2c98fde 1226 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1227 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1228 sta->sta.addr, sta->sta.aid);
af818581
JB		 1229 return;
1230 }
1231
1232 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1233}
1234
d057e5a3
AN		 1235int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1236{
1237 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1238 bool in_ps;
1239
1240 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1241
1242 /* Don't let the same PS state be set twice */
c2c98fde 1243 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1244 if ((start && in_ps) || (!start && !in_ps))
1245 return -EINVAL;
1246
1247 if (start)
d012a605 1248 sta_ps_start(sta_inf);
d057e5a3 1249 else
d012a605 1250 sta_ps_end(sta_inf);
d057e5a3
AN		 1251
1252 return 0;
1253}
1254EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1255
47086fc5
JB		 1256static ieee80211_rx_result debug_noinline
1257ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1258{
1259 struct ieee80211_sub_if_data *sdata = rx->sdata;
1260 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1261 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1262 int tid, ac;
1263
1264 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1265 return RX_CONTINUE;
1266
1267 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1268 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1269 return RX_CONTINUE;
1270
1271 /*
1272 * The device handles station powersave, so don't do anything about
1273 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1274 * it to mac80211 since they're handled.)
1275 */
1276 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1277 return RX_CONTINUE;
1278
1279 /*
1280 * Don't do anything if the station isn't already asleep. In
1281 * the uAPSD case, the station will probably be marked asleep,
1282 * in the PS-Poll case the station must be confused ...
1283 */
c2c98fde 1284 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1285 return RX_CONTINUE;
1286
1287 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1288 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1289 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1290 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1291 else
c2c98fde 1292 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1293 }
47086fc5
JB		 1294
1295 /* Free PS Poll skb here instead of returning RX_DROP that would
1296 * count as an dropped frame. */
1297 dev_kfree_skb(rx->skb);
1298
1299 return RX_QUEUED;
1300 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1301 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1302 ieee80211_has_pm(hdr->frame_control) &&
1303 (ieee80211_is_data_qos(hdr->frame_control) ||
1304 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1305 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1306 ac = ieee802_1d_to_ac[tid & 7];
1307
1308 /*
1309 * If this AC is not trigger-enabled do nothing.
1310 *
1311 * NB: This could/should check a separate bitmap of trigger-
1312 * enabled queues, but for now we only implement uAPSD w/o
1313 * TSPEC changes to the ACs, so they're always the same.
1314 */
1315 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1316 return RX_CONTINUE;
1317
1318 /* if we are in a service period, do nothing */
c2c98fde 1319 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1320 return RX_CONTINUE;
1321
c2c98fde 1322 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1323 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1324 else
c2c98fde 1325 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1326 }
1327
1328 return RX_CONTINUE;
1329}
1330
49461622 1331static ieee80211_rx_result debug_noinline
5cf121c3 1332ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1333{
1334 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1335 struct sk_buff *skb = rx->skb;
1336 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1337 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1338
1339 if (!sta)
9ae54c84 1340 return RX_CONTINUE;
571ecf67 1341
b291ba11
JB		 1342 /*
1343 * Update last_rx only for IBSS packets which are for the current
e584da5e
AQ		 1344 * BSSID and for station already AUTHORIZED to avoid keeping the
1345 * current IBSS network alive in cases where other STAs start
1346 * using different BSSID. This will also give the station another
1347 * chance to restart the authentication/authorization in case
1348 * something went wrong the first time.
b291ba11 1349 */
05c914fe 1350 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1351 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1352 NL80211_IFTYPE_ADHOC);
e584da5e
AQ		 1353 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1354 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
571ecf67 1355 sta->last_rx = jiffies;
3af6334c
FF		 1356 if (ieee80211_is_data(hdr->frame_control)) {
1357 sta->last_rx_rate_idx = status->rate_idx;
1358 sta->last_rx_rate_flag = status->flag;
5614618e 1359 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c
FF		 1360 }
1361 }
b291ba11
JB		 1362 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1363 /*
33b64eb2
LCC		 1364 * Mesh beacons will update last_rx when if they are found to
1365 * match the current local configuration when processed.
571ecf67 1366 */
b291ba11 1367 sta->last_rx = jiffies;
3af6334c
FF		 1368 if (ieee80211_is_data(hdr->frame_control)) {
1369 sta->last_rx_rate_idx = status->rate_idx;
1370 sta->last_rx_rate_flag = status->flag;
5614618e 1371 sta->last_rx_rate_vht_nss = status->vht_nss;
3af6334c 1372 }
571ecf67
JB		 1373 }
1374
554891e6 1375 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1376 return RX_CONTINUE;
571ecf67 1377
3cf335d5
KV		 1378 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1379 ieee80211_sta_rx_notify(rx->sdata, hdr);
1380
571ecf67
JB		 1381 sta->rx_fragments++;
1382 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1383 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1384 sta->last_signal = status->signal;
1385 ewma_add(&sta->avg_signal, -status->signal);
1386 }
571ecf67 1387
72eaa43a
JB		 1388 /*
1389 * Change STA power saving mode only at the end of a frame
1390 * exchange sequence.
1391 */
d057e5a3
AN		 1392 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1393 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1394 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1395 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1396 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1397 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1398 /*
1399 * Ignore doze->wake transitions that are
1400 * indicated by non-data frames, the standard
1401 * is unclear here, but for example going to
1402 * PS mode and then scanning would cause a
1403 * doze->wake transition for the probe request,
1404 * and that is clearly undesirable.
1405 */
1406 if (ieee80211_is_data(hdr->frame_control) &&
1407 !ieee80211_has_pm(hdr->frame_control))
d012a605 1408 sta_ps_end(sta);
72eaa43a
JB		 1409 } else {
1410 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1411 sta_ps_start(sta);
72eaa43a 1412 }
571ecf67
JB		 1413 }
1414
22403def
JB		 1415 /*
1416 * Drop (qos-)data::nullfunc frames silently, since they
1417 * are used only to control station power saving mode.
1418 */
1419 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1420 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1421 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1422
1423 /*
1424 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1425 * that was not moved to a 4-addr STA vlan yet send
1426 * the event to userspace and for older hostapd drop
1427 * the frame to the monitor interface.
d524215f
FF		 1428 */
1429 if (ieee80211_has_a4(hdr->frame_control) &&
1430 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1431 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1432 !rx->sdata->u.vlan.sta))) {
1433 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1434 cfg80211_rx_unexpected_4addr_frame(
1435 rx->sdata->dev, sta->sta.addr,
1436 GFP_ATOMIC);
d524215f 1437 return RX_DROP_MONITOR;
e7f4a940 1438 }
22403def
JB		 1439 /*
1440 * Update counter and free packet here to avoid
1441 * counting this as a dropped packed.
1442 */
571ecf67
JB		 1443 sta->rx_packets++;
1444 dev_kfree_skb(rx->skb);
9ae54c84 1445 return RX_QUEUED;
571ecf67
JB		 1446 }
1447
9ae54c84 1448 return RX_CONTINUE;
571ecf67
JB		 1449} /* ieee80211_rx_h_sta_process */
1450
571ecf67
JB		 1451static inline struct ieee80211_fragment_entry *
1452ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1453 unsigned int frag, unsigned int seq, int rx_queue,
1454 struct sk_buff **skb)
1455{
1456 struct ieee80211_fragment_entry *entry;
571ecf67 1457
571ecf67
JB		 1458 entry = &sdata->fragments[sdata->fragment_next++];
1459 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1460 sdata->fragment_next = 0;
1461
bdcbd8e0 1462 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1463 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1464
1465 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1466 *skb = NULL;
1467 entry->first_frag_time = jiffies;
1468 entry->seq = seq;
1469 entry->rx_queue = rx_queue;
1470 entry->last_frag = frag;
1471 entry->ccmp = 0;
1472 entry->extra_len = 0;
1473
1474 return entry;
1475}
1476
1477static inline struct ieee80211_fragment_entry *
1478ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1479 unsigned int frag, unsigned int seq,
571ecf67
JB		 1480 int rx_queue, struct ieee80211_hdr *hdr)
1481{
1482 struct ieee80211_fragment_entry *entry;
1483 int i, idx;
1484
1485 idx = sdata->fragment_next;
1486 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1487 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1488
1489 idx--;
1490 if (idx < 0)
1491 idx = IEEE80211_FRAGMENT_MAX - 1;
1492
1493 entry = &sdata->fragments[idx];
1494 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1495 entry->rx_queue != rx_queue ||
1496 entry->last_frag + 1 != frag)
1497 continue;
1498
b73d70ad 1499 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1500
b73d70ad
HH		 1501 /*
1502 * Check ftype and addresses are equal, else check next fragment
1503 */
1504 if (((hdr->frame_control ^ f_hdr->frame_control) &
1505 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1506 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1507 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1508 continue;
1509
ab46623e 1510 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1511 __skb_queue_purge(&entry->skb_list);
1512 continue;
1513 }
1514 return entry;
1515 }
1516
1517 return NULL;
1518}
1519
49461622 1520static ieee80211_rx_result debug_noinline
5cf121c3 1521ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1522{
1523 struct ieee80211_hdr *hdr;
1524 u16 sc;
358c8d9d 1525 __le16 fc;
571ecf67
JB		 1526 unsigned int frag, seq;
1527 struct ieee80211_fragment_entry *entry;
1528 struct sk_buff *skb;
554891e6 1529 struct ieee80211_rx_status *status;
571ecf67 1530
b73d70ad 1531 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1532 fc = hdr->frame_control;
f7fbf70e
JC		 1533
1534 if (ieee80211_is_ctl(fc))
1535 return RX_CONTINUE;
1536
571ecf67
JB		 1537 sc = le16_to_cpu(hdr->seq_ctrl);
1538 frag = sc & IEEE80211_SCTL_FRAG;
1539
358c8d9d 1540 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1541 is_multicast_ether_addr(hdr->addr1))) {
1542 /* not fragmented */
1543 goto out;
1544 }
1545 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1546
e3cf8b3f
ZY		 1547 if (skb_linearize(rx->skb))
1548 return RX_DROP_UNUSABLE;
1549
058897a4
AK		 1550 /*
1551 * skb_linearize() might change the skb->data and
1552 * previously cached variables (in this case, hdr) need to
1553 * be refreshed with the new data.
1554 */
1555 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1556 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1557
1558 if (frag == 0) {
1559 /* This is the first fragment of a new frame. */
1560 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1561 rx->seqno_idx, &(rx->skb));
97359d12 1562 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1563 ieee80211_has_protected(fc)) {
9e26297a 1564 int queue = rx->security_idx;
571ecf67
JB		 1565 /* Store CCMP PN so that we can verify that the next
1566 * fragment has a sequential PN value. */
1567 entry->ccmp = 1;
1568 memcpy(entry->last_pn,
9190252c 1569 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1570 CCMP_PN_LEN);
1571 }
9ae54c84 1572 return RX_QUEUED;
571ecf67
JB		 1573 }
1574
1575 /* This is a fragment for a frame that should already be pending in
1576 * fragment cache. Add this fragment to the end of the pending entry.
1577 */
9e26297a
JB		 1578 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1579 rx->seqno_idx, hdr);
571ecf67
JB		 1580 if (!entry) {
1581 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1582 return RX_DROP_MONITOR;
571ecf67
JB		 1583 }
1584
1585 /* Verify that MPDUs within one MSDU have sequential PN values.
1586 * (IEEE 802.11i, 8.3.3.4.5) */
1587 if (entry->ccmp) {
1588 int i;
1589 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1590 int queue;
97359d12 1591 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1592 return RX_DROP_UNUSABLE;
571ecf67
JB		 1593 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1594 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1595 pn[i]++;
1596 if (pn[i])
1597 break;
1598 }
9e26297a 1599 queue = rx->security_idx;
9190252c 1600 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1601 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1602 return RX_DROP_UNUSABLE;
571ecf67
JB		 1603 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1604 }
1605
358c8d9d 1606 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1607 __skb_queue_tail(&entry->skb_list, rx->skb);
1608 entry->last_frag = frag;
1609 entry->extra_len += rx->skb->len;
358c8d9d 1610 if (ieee80211_has_morefrags(fc)) {
571ecf67 1611 rx->skb = NULL;
9ae54c84 1612 return RX_QUEUED;
571ecf67
JB		 1613 }
1614
1615 rx->skb = __skb_dequeue(&entry->skb_list);
1616 if (skb_tailroom(rx->skb) < entry->extra_len) {
1617 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1618 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1619 GFP_ATOMIC))) {
1620 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1621 __skb_queue_purge(&entry->skb_list);
e4c26add 1622 return RX_DROP_UNUSABLE;
571ecf67
JB		 1623 }
1624 }
1625 while ((skb = __skb_dequeue(&entry->skb_list))) {
1626 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1627 dev_kfree_skb(skb);
1628 }
1629
1630 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1631 status = IEEE80211_SKB_RXCB(rx->skb);
1632 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1633
1634 out:
1635 if (rx->sta)
1636 rx->sta->rx_packets++;
1637 if (is_multicast_ether_addr(hdr->addr1))
1638 rx->local->dot11MulticastReceivedFrameCount++;
1639 else
1640 ieee80211_led_rx(rx->local);
9ae54c84 1641 return RX_CONTINUE;
571ecf67
JB		 1642}
1643
1df332e8 1644static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1645{
1df332e8 1646 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1647 return -EACCES;
571ecf67 1648
76ee65bf 1649 return 0;
571ecf67
JB		 1650}
1651
1df332e8 1652static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1653{
eb9fb5b8
JB		 1654 struct sk_buff *skb = rx->skb;
1655 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1656
3017b80b 1657 /*
7848ba7d
JB		 1658 * Pass through unencrypted frames if the hardware has
1659 * decrypted them already.
3017b80b 1660 */
eb9fb5b8 1661 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1662 return 0;
571ecf67
JB		 1663
1664 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1665 if (unlikely(!ieee80211_has_protected(fc) &&
1666 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1667 ieee80211_is_data(fc) &&
b3fc9c6c 1668 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1669 return -EACCES;
bef5d1c7
JB		 1670
1671 return 0;
1672}
1673
1df332e8 1674static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1675{
1676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1677 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1678 __le16 fc = hdr->frame_control;
bef5d1c7 1679
e3efca0a
JM		 1680 /*
1681 * Pass through unencrypted frames if the hardware has
1682 * decrypted them already.
1683 */
1684 if (status->flag & RX_FLAG_DECRYPTED)
1685 return 0;
bef5d1c7 1686
c2c98fde 1687 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1688 if (unlikely(!ieee80211_has_protected(fc) &&
1689 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1690 rx->key)) {
1691 if (ieee80211_is_deauth(fc))
1692 cfg80211_send_unprot_deauth(rx->sdata->dev,
1693 rx->skb->data,
1694 rx->skb->len);
1695 else if (ieee80211_is_disassoc(fc))
1696 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1697 rx->skb->data,
1698 rx->skb->len);
f2ca3ea4 1699 return -EACCES;
cf4e594e 1700 }
f2ca3ea4 1701 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1702 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1703 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1704 if (ieee80211_is_deauth(fc))
1705 cfg80211_send_unprot_deauth(rx->sdata->dev,
1706 rx->skb->data,
1707 rx->skb->len);
1708 else if (ieee80211_is_disassoc(fc))
1709 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1710 rx->skb->data,
1711 rx->skb->len);
f2ca3ea4 1712 return -EACCES;
cf4e594e 1713 }
f2ca3ea4
JM		 1714 /*
1715 * When using MFP, Action frames are not allowed prior to
1716 * having configured keys.
1717 */
1718 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1719 ieee80211_is_robust_mgmt_frame(
1720 (struct ieee80211_hdr *) rx->skb->data)))
1721 return -EACCES;
1722 }
b3fc9c6c 1723
76ee65bf 1724 return 0;
571ecf67
JB		 1725}
1726
76ee65bf 1727static int
4114fa21 1728__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1729{
eb9fb5b8 1730 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1731 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1732 bool check_port_control = false;
1733 struct ethhdr *ehdr;
1734 int ret;
f14543ee 1735
4114fa21 1736 *port_control = false;
9bc383de
JB		 1737 if (ieee80211_has_a4(hdr->frame_control) &&
1738 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1739 return -1;
9bc383de 1740
fbb327c5
FF		 1741 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1742 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1743
1744 if (!sdata->u.mgd.use_4addr)
1745 return -1;
1746 else
1747 check_port_control = true;
1748 }
1749
9bc383de 1750 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1751 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1752 return -1;
571ecf67 1753
fbb327c5 1754 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1755 if (ret < 0)
fbb327c5
FF		 1756 return ret;
1757
1758 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1759 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1760 *port_control = true;
1761 else if (check_port_control)
fbb327c5
FF		 1762 return -1;
1763
1764 return 0;
76ee65bf 1765}
571ecf67 1766
ce3edf6d
JB		 1767/*
1768 * requires that rx->skb is a frame with ethernet header
1769 */
358c8d9d 1770static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1771{
c97c23e3 1772 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1773 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1774 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1775
1776 /*
1777 * Allow EAPOL frames to us/the PAE group address regardless
1778 * of whether the frame was encrypted or not.
1779 */
a621fa4d 1780 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1781 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1782 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1783 return true;
1784
1785 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1786 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1787 return false;
1788
1789 return true;
1790}
1791
1792/*
1793 * requires that rx->skb is a frame with ethernet header
1794 */
76ee65bf 1795static void
5cf121c3 1796ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1797{
eb9fb5b8
JB		 1798 struct ieee80211_sub_if_data *sdata = rx->sdata;
1799 struct net_device *dev = sdata->dev;
76ee65bf 1800 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1801 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1802 struct sta_info *dsta;
554891e6 1803 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1804
76ee65bf
RR		 1805 skb = rx->skb;
1806 xmit_skb = NULL;
571ecf67 1807
05c914fe
JB		 1808 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1809 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1810 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1811 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1812 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1813 if (is_multicast_ether_addr(ehdr->h_dest)) {
1814 /*
1815 * send multicast frames both to higher layers in
1816 * local net stack and back to the wireless medium
1817 */
76ee65bf 1818 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1819 if (!xmit_skb)
bdcbd8e0 1820 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1821 dev->name);
571ecf67 1822 } else {
abe60632
JB		 1823 dsta = sta_info_get(sdata, skb->data);
1824 if (dsta) {
ce3edf6d
JB		 1825 /*
1826 * The destination station is associated to
1827 * this AP (in this VLAN), so send the frame
1828 * directly to it and do not pass it to local
1829 * net stack.
571ecf67 1830 */
76ee65bf 1831 xmit_skb = skb;
571ecf67
JB		 1832 skb = NULL;
1833 }
571ecf67
JB		 1834 }
1835 }
1836
1837 if (skb) {
d1c3a37c
JB		 1838 int align __maybe_unused;
1839
59d9cb07 1840#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1841 /*
1842 * 'align' will only take the values 0 or 2 here
1843 * since all frames are required to be aligned
1844 * to 2-byte boundaries when being passed to
1845 * mac80211. That also explains the __skb_push()
1846 * below.
1847 */
dacb6f1d 1848 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1849 if (align) {
1850 if (WARN_ON(skb_headroom(skb) < 3)) {
1851 dev_kfree_skb(skb);
1852 skb = NULL;
1853 } else {
1854 u8 *data = skb->data;
8ce0b589
ZY		 1855 size_t len = skb_headlen(skb);
1856 skb->data -= align;
1857 memmove(skb->data, data, len);
1858 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1859 }
1860 }
1861#endif
1862
1863 if (skb) {
1864 /* deliver to local stack */
1865 skb->protocol = eth_type_trans(skb, dev);
1866 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1867 netif_receive_skb(skb);
d1c3a37c 1868 }
571ecf67
JB		 1869 }
1870
76ee65bf 1871 if (xmit_skb) {
aef6c928
HS		 1872 /*
1873 * Send to wireless media and increase priority by 256 to
1874 * keep the received priority instead of reclassifying
1875 * the frame (see cfg80211_classify8021d).
1876 */
1877 xmit_skb->priority += 256;
f831e909 1878 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1879 skb_reset_network_header(xmit_skb);
1880 skb_reset_mac_header(xmit_skb);
76ee65bf 1881 dev_queue_xmit(xmit_skb);
571ecf67 1882 }
76ee65bf
RR		 1883}
1884
49461622 1885static ieee80211_rx_result debug_noinline
5cf121c3 1886ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1887{
eb9fb5b8 1888 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1889 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1890 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1891 __le16 fc = hdr->frame_control;
eaf85ca7 1892 struct sk_buff_head frame_list;
554891e6 1893 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1894
358c8d9d 1895 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1896 return RX_CONTINUE;
fd4c7f2f 1897
358c8d9d 1898 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1899 return RX_DROP_MONITOR;
fd4c7f2f 1900
554891e6 1901 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1902 return RX_CONTINUE;
fd4c7f2f 1903
eaf85ca7
ZY		 1904 if (ieee80211_has_a4(hdr->frame_control) &&
1905 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1906 !rx->sdata->u.vlan.sta)
e4c26add 1907 return RX_DROP_UNUSABLE;
fd4c7f2f 1908
eaf85ca7
ZY		 1909 if (is_multicast_ether_addr(hdr->addr1) &&
1910 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1911 rx->sdata->u.vlan.sta) ||
1912 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1913 rx->sdata->u.mgd.use_4addr)))
e4c26add 1914 return RX_DROP_UNUSABLE;
fd4c7f2f 1915
eaf85ca7
ZY		 1916 skb->dev = dev;
1917 __skb_queue_head_init(&frame_list);
fd4c7f2f 1918
e3cf8b3f
ZY		 1919 if (skb_linearize(skb))
1920 return RX_DROP_UNUSABLE;
1921
eaf85ca7
ZY		 1922 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1923 rx->sdata->vif.type,
8b3becad 1924 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1925
eaf85ca7
ZY		 1926 while (!skb_queue_empty(&frame_list)) {
1927 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1928
358c8d9d 1929 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1930 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1931 continue;
1932 }
eaf85ca7
ZY		 1933 dev->stats.rx_packets++;
1934 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1935
1936 ieee80211_deliver_skb(rx);
1937 }
1938
9ae54c84 1939 return RX_QUEUED;
fd4c7f2f
RR		 1940}
1941
bf94e17b 1942#ifdef CONFIG_MAC80211_MESH
b0dee578 1943static ieee80211_rx_result
e32f85f7
LCC		 1944ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1945{
30789eb6
TP		 1946 struct ieee80211_hdr *fwd_hdr, *hdr;
1947 struct ieee80211_tx_info *info;
e32f85f7 1948 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1949 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1950 struct ieee80211_local *local = rx->local;
eb9fb5b8 1951 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1952 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1953 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1954 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1955 u16 q, hdrlen;
e32f85f7
LCC		 1956
1957 hdr = (struct ieee80211_hdr *) skb->data;
1958 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 1959
1960 /* make sure fixed part of mesh header is there, also checks skb len */
1961 if (!pskb_may_pull(rx->skb, hdrlen + 6))
1962 return RX_DROP_MONITOR;
1963
1964 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1965
1966 /* make sure full mesh header is there, also checks skb len */
1967 if (!pskb_may_pull(rx->skb,
1968 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1969 return RX_DROP_MONITOR;
1970
1971 /* reload pointers */
1972 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 1973 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1974
2157fdd6
TP		 1975 /* frame is in RMC, don't forward */
1976 if (ieee80211_is_data(hdr->frame_control) &&
1977 is_multicast_ether_addr(hdr->addr1) &&
1978 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1979 return RX_DROP_MONITOR;
1980
555cb715
JC		 1981 if (!ieee80211_is_data(hdr->frame_control) ||
1982 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 1983 return RX_CONTINUE;
1984
1985 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1986 return RX_DROP_MONITOR;
1987
43b7b314 1988 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1989 struct mesh_path *mppath;
43b7b314
JC		 1990 char *proxied_addr;
1991 char *mpp_addr;
1992
1993 if (is_multicast_ether_addr(hdr->addr1)) {
1994 mpp_addr = hdr->addr3;
1995 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 1996 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1997 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 1998 mpp_addr = hdr->addr4;
1999 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 2000 } else {
2001 return RX_DROP_MONITOR;
43b7b314 2002 }
79617dee 2003
79617dee 2004 rcu_read_lock();
43b7b314 2005 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 2006 if (!mppath) {
43b7b314 2007 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 2008 } else {
2009 spin_lock_bh(&mppath->state_lock);
b203ca39 2010 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 2011 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 2012 spin_unlock_bh(&mppath->state_lock);
2013 }
2014 rcu_read_unlock();
2015 }
2016
3c5772a5
JC		 2017 /* Frame has reached destination. Don't forward */
2018 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 2019 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 2020 return RX_CONTINUE;
2021
00e96dec 2022 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 2023 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 2024 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 2025 return RX_DROP_MONITOR;
2026 }
2027 skb_set_queue_mapping(skb, q);
e32f85f7 2028
30789eb6
TP		 2029 if (!--mesh_hdr->ttl) {
2030 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 2031 goto out;
30789eb6
TP		 2032 }
2033
d665508b
CYY		 2034 if (!ifmsh->mshcfg.dot11MeshForwarding)
2035 goto out;
2036
30789eb6
TP		 2037 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2038 if (!fwd_skb) {
bdcbd8e0 2039 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 2040 sdata->name);
30789eb6
TP		 2041 goto out;
2042 }
2043
2044 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
2045 info = IEEE80211_SKB_CB(fwd_skb);
2046 memset(info, 0, sizeof(*info));
2047 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2048 info->control.vif = &rx->sdata->vif;
2049 info->control.jiffies = jiffies;
2050 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2051 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2052 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
2053 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
2054 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2055 } else {
2056 /* unable to resolve next hop */
2057 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1df332e8 2058 0, reason, fwd_hdr->addr2, sdata);
30789eb6 2059 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2060 kfree_skb(fwd_skb);
30789eb6 2061 return RX_DROP_MONITOR;
e32f85f7
LCC		 2062 }
2063
30789eb6
TP		 2064 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2065 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2066 out:
3c5772a5 2067 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2068 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2069 return RX_CONTINUE;
2070 else
2071 return RX_DROP_MONITOR;
2072}
bf94e17b 2073#endif
e32f85f7 2074
49461622 2075static ieee80211_rx_result debug_noinline
5cf121c3 2076ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2077{
eb9fb5b8 2078 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2079 struct ieee80211_local *local = rx->local;
eb9fb5b8 2080 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2081 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2082 __le16 fc = hdr->frame_control;
4114fa21 2083 bool port_control;
ce3edf6d 2084 int err;
76ee65bf 2085
358c8d9d 2086 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2087 return RX_CONTINUE;
76ee65bf 2088
358c8d9d 2089 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2090 return RX_DROP_MONITOR;
76ee65bf 2091
f14543ee 2092 /*
e7f4a940
JB		 2093 * Send unexpected-4addr-frame event to hostapd. For older versions,
2094 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2095 */
2096 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2097 sdata->vif.type == NL80211_IFTYPE_AP) {
2098 if (rx->sta &&
2099 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2100 cfg80211_rx_unexpected_4addr_frame(
2101 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2102 return RX_DROP_MONITOR;
e7f4a940 2103 }
f14543ee 2104
4114fa21 2105 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2106 if (unlikely(err))
e4c26add 2107 return RX_DROP_UNUSABLE;
76ee65bf 2108
358c8d9d 2109 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2110 return RX_DROP_MONITOR;
ce3edf6d 2111
4114fa21
FF		 2112 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2113 unlikely(port_control) && sdata->bss) {
2114 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2115 u.ap);
2116 dev = sdata->dev;
2117 rx->sdata = sdata;
2118 }
2119
76ee65bf
RR		 2120 rx->skb->dev = dev;
2121
2122 dev->stats.rx_packets++;
2123 dev->stats.rx_bytes += rx->skb->len;
2124
08ca944e 2125 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2126 !is_multicast_ether_addr(
2127 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2128 (!local->scanning &&
2129 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2130 mod_timer(&local->dynamic_ps_timer, jiffies +
2131 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2132 }
2133
76ee65bf 2134 ieee80211_deliver_skb(rx);
571ecf67 2135
9ae54c84 2136 return RX_QUEUED;
571ecf67
JB		 2137}
2138
49461622 2139static ieee80211_rx_result debug_noinline
24a8fdad 2140ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2141{
71364716 2142 struct sk_buff *skb = rx->skb;
a7767f95 2143 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2144 struct tid_ampdu_rx *tid_agg_rx;
2145 u16 start_seq_num;
2146 u16 tid;
2147
a7767f95 2148 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2149 return RX_CONTINUE;
71364716 2150
a7767f95 2151 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2152 struct {
2153 __le16 control, start_seq_num;
2154 } __packed bar_data;
2155
71364716 2156 if (!rx->sta)
a02ae758 2157 return RX_DROP_MONITOR;
8ae5977f
JB		 2158
2159 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2160 &bar_data, sizeof(bar_data)))
2161 return RX_DROP_MONITOR;
2162
8ae5977f 2163 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2164
2165 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2166 if (!tid_agg_rx)
a02ae758 2167 return RX_DROP_MONITOR;
71364716 2168
8ae5977f 2169 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2170
2171 /* reset session timer */
20ad19d0
JB		 2172 if (tid_agg_rx->timeout)
2173 mod_timer(&tid_agg_rx->session_timer,
2174 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2175
dd318575 2176 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2177 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2178 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2179 start_seq_num);
dd318575
JB		 2180 spin_unlock(&tid_agg_rx->reorder_lock);
2181
a02ae758
JB		 2182 kfree_skb(skb);
2183 return RX_QUEUED;
71364716
RR		 2184 }
2185
08daecae
JB		 2186 /*
2187 * After this point, we only want management frames,
2188 * so we can drop all remaining control frames to
2189 * cooked monitor interfaces.
2190 */
2191 return RX_DROP_MONITOR;
71364716
RR		 2192}
2193
f4f727a6
JM		 2194static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2195 struct ieee80211_mgmt *mgmt,
2196 size_t len)
fea14732
JM		 2197{
2198 struct ieee80211_local *local = sdata->local;
2199 struct sk_buff *skb;
2200 struct ieee80211_mgmt *resp;
2201
b203ca39 2202 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2203 /* Not to own unicast address */
2204 return;
2205 }
2206
b203ca39
JP		 2207 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2208 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2209 /* Not from the current AP or not associated yet. */
fea14732
JM		 2210 return;
2211 }
2212
2213 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2214 /* Too short SA Query request frame */
2215 return;
2216 }
2217
2218 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2219 if (skb == NULL)
2220 return;
2221
2222 skb_reserve(skb, local->hw.extra_tx_headroom);
2223 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2224 memset(resp, 0, 24);
2225 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2226 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2227 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2228 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2229 IEEE80211_STYPE_ACTION);
2230 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2231 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2232 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2233 memcpy(resp->u.action.u.sa_query.trans_id,
2234 mgmt->u.action.u.sa_query.trans_id,
2235 WLAN_SA_QUERY_TR_ID_LEN);
2236
62ae67be 2237 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2238}
2239
2e161f78
JB		 2240static ieee80211_rx_result debug_noinline
2241ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2242{
2243 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2244 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2245
2246 /*
2247 * From here on, look only at management frames.
2248 * Data and control frames are already handled,
2249 * and unknown (reserved) frames are useless.
2250 */
2251 if (rx->skb->len < 24)
2252 return RX_DROP_MONITOR;
2253
2254 if (!ieee80211_is_mgmt(mgmt->frame_control))
2255 return RX_DROP_MONITOR;
2256
ee971924
JB		 2257 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2258 ieee80211_is_beacon(mgmt->frame_control) &&
2259 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2260 int sig = 0;
2261
2262 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2263 sig = status->signal;
2264
ee971924
JB		 2265 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2266 rx->skb->data, rx->skb->len,
37c73b5f 2267 status->freq, sig);
ee971924
JB		 2268 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2269 }
2270
554891e6 2271 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2272 return RX_DROP_MONITOR;
2273
2274 if (ieee80211_drop_unencrypted_mgmt(rx))
2275 return RX_DROP_UNUSABLE;
2276
2277 return RX_CONTINUE;
2278}
2279
de1ede7a
JB		 2280static ieee80211_rx_result debug_noinline
2281ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2282{
2283 struct ieee80211_local *local = rx->local;
eb9fb5b8 2284 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2285 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2286 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2287 int len = rx->skb->len;
2288
2289 if (!ieee80211_is_action(mgmt->frame_control))
2290 return RX_CONTINUE;
2291
026331c4
JM		 2292 /* drop too small frames */
2293 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2294 return RX_DROP_UNUSABLE;
de1ede7a 2295
026331c4 2296 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2297 return RX_DROP_UNUSABLE;
de1ede7a 2298
554891e6 2299 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2300 return RX_DROP_UNUSABLE;
97ebe12a 2301
de1ede7a 2302 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2303 case WLAN_CATEGORY_HT:
2304 /* reject HT action frames from stations not supporting HT */
2305 if (!rx->sta->sta.ht_cap.ht_supported)
2306 goto invalid;
2307
2308 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2309 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2310 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2311 sdata->vif.type != NL80211_IFTYPE_AP &&
2312 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2313 break;
2314
2315 /* verify action & smps_control are present */
2316 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2317 goto invalid;
2318
2319 switch (mgmt->u.action.u.ht_smps.action) {
2320 case WLAN_HT_ACTION_SMPS: {
2321 struct ieee80211_supported_band *sband;
2322 u8 smps;
2323
2324 /* convert to HT capability */
2325 switch (mgmt->u.action.u.ht_smps.smps_control) {
2326 case WLAN_HT_SMPS_CONTROL_DISABLED:
2327 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2328 break;
2329 case WLAN_HT_SMPS_CONTROL_STATIC:
2330 smps = WLAN_HT_CAP_SM_PS_STATIC;
2331 break;
2332 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2333 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2334 break;
2335 default:
2336 goto invalid;
2337 }
2338 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2339
2340 /* if no change do nothing */
2341 if ((rx->sta->sta.ht_cap.cap &
2342 IEEE80211_HT_CAP_SM_PS) == smps)
2343 goto handled;
2344
2345 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2346 rx->sta->sta.ht_cap.cap |= smps;
2347
2348 sband = rx->local->hw.wiphy->bands[status->band];
2349
64f68e5d
JB		 2350 rate_control_rate_update(local, sband, rx->sta,
2351 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2352 goto handled;
2353 }
2354 default:
2355 goto invalid;
2356 }
2357
2358 break;
de1ede7a 2359 case WLAN_CATEGORY_BACK:
8abd3f9b 2360 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2361 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2362 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2363 sdata->vif.type != NL80211_IFTYPE_AP &&
2364 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2365 break;
8abd3f9b 2366
026331c4
JM		 2367 /* verify action_code is present */
2368 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2369 break;
2370
de1ede7a
JB		 2371 switch (mgmt->u.action.u.addba_req.action_code) {
2372 case WLAN_ACTION_ADDBA_REQ:
2373 if (len < (IEEE80211_MIN_ACTION_SIZE +
2374 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2375 goto invalid;
2376 break;
de1ede7a
JB		 2377 case WLAN_ACTION_ADDBA_RESP:
2378 if (len < (IEEE80211_MIN_ACTION_SIZE +
2379 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2380 goto invalid;
2381 break;
de1ede7a
JB		 2382 case WLAN_ACTION_DELBA:
2383 if (len < (IEEE80211_MIN_ACTION_SIZE +
2384 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2385 goto invalid;
2386 break;
2387 default:
2388 goto invalid;
de1ede7a 2389 }
bed7ee6e 2390
8b58ff83 2391 goto queue;
39192c0b 2392 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2393 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2394 break;
46900298
JB		 2395
2396 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2397 break;
46900298 2398
026331c4
JM		 2399 /* verify action_code is present */
2400 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2401 break;
2402
39192c0b
JB		 2403 switch (mgmt->u.action.u.measurement.action_code) {
2404 case WLAN_ACTION_SPCT_MSR_REQ:
2405 if (len < (IEEE80211_MIN_ACTION_SIZE +
2406 sizeof(mgmt->u.action.u.measurement)))
84040805 2407 break;
39192c0b 2408 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2409 goto handled;
c481ec97
S		 2410 case WLAN_ACTION_SPCT_CHL_SWITCH:
2411 if (len < (IEEE80211_MIN_ACTION_SIZE +
2412 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2413 break;
c481ec97 2414
cc32abd4 2415 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2416 break;
cc32abd4 2417
b203ca39 2418 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2419 break;
c481ec97 2420
8b58ff83 2421 goto queue;
39192c0b
JB		 2422 }
2423 break;
fea14732
JM		 2424 case WLAN_CATEGORY_SA_QUERY:
2425 if (len < (IEEE80211_MIN_ACTION_SIZE +
2426 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2427 break;
2428
fea14732
JM		 2429 switch (mgmt->u.action.u.sa_query.action) {
2430 case WLAN_ACTION_SA_QUERY_REQUEST:
2431 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2432 break;
fea14732 2433 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2434 goto handled;
fea14732
JM		 2435 }
2436 break;
8db09850 2437 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2438 if (len < (IEEE80211_MIN_ACTION_SIZE +
2439 sizeof(mgmt->u.action.u.self_prot.action_code)))
2440 break;
2441
8db09850
TP		 2442 switch (mgmt->u.action.u.self_prot.action_code) {
2443 case WLAN_SP_MESH_PEERING_OPEN:
2444 case WLAN_SP_MESH_PEERING_CLOSE:
2445 case WLAN_SP_MESH_PEERING_CONFIRM:
2446 if (!ieee80211_vif_is_mesh(&sdata->vif))
2447 goto invalid;
2448 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2449 /* userspace handles this frame */
2450 break;
2451 goto queue;
2452 case WLAN_SP_MGK_INFORM:
2453 case WLAN_SP_MGK_ACK:
2454 if (!ieee80211_vif_is_mesh(&sdata->vif))
2455 goto invalid;
2456 break;
2457 }
2458 break;
d3aaec8a 2459 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2460 if (len < (IEEE80211_MIN_ACTION_SIZE +
2461 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2462 break;
2463
77a121c3
JB		 2464 if (!ieee80211_vif_is_mesh(&sdata->vif))
2465 break;
25d49e4d 2466 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2467 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2468 break;
2469 goto queue;
84040805 2470 }
026331c4 2471
2e161f78
JB		 2472 return RX_CONTINUE;
2473
bed7ee6e 2474 invalid:
554891e6 2475 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2476 /* will return in the next handlers */
2477 return RX_CONTINUE;
2478
2479 handled:
2480 if (rx->sta)
2481 rx->sta->rx_packets++;
2482 dev_kfree_skb(rx->skb);
2483 return RX_QUEUED;
2484
2485 queue:
2486 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2487 skb_queue_tail(&sdata->skb_queue, rx->skb);
2488 ieee80211_queue_work(&local->hw, &sdata->work);
2489 if (rx->sta)
2490 rx->sta->rx_packets++;
2491 return RX_QUEUED;
2492}
2493
2494static ieee80211_rx_result debug_noinline
2495ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2496{
554891e6 2497 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2498 int sig = 0;
2e161f78
JB		 2499
2500 /* skip known-bad action frames and return them in the next handler */
554891e6 2501 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2502 return RX_CONTINUE;
d7907448 2503
026331c4
JM		 2504 /*
2505 * Getting here means the kernel doesn't know how to handle
2506 * it, but maybe userspace does ... include returned frames
2507 * so userspace can register for those to know whether ones
2508 * it transmitted were processed or returned.
2509 */
026331c4 2510
804483e9
JB		 2511 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2512 sig = status->signal;
2513
71bbc994 2514 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2515 rx->skb->data, rx->skb->len,
2516 GFP_ATOMIC)) {
2517 if (rx->sta)
2518 rx->sta->rx_packets++;
2519 dev_kfree_skb(rx->skb);
2520 return RX_QUEUED;
2521 }
2522
2e161f78
JB		 2523 return RX_CONTINUE;
2524}
2525
2526static ieee80211_rx_result debug_noinline
2527ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2528{
2529 struct ieee80211_local *local = rx->local;
2530 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2531 struct sk_buff *nskb;
2532 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2533 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2534
2535 if (!ieee80211_is_action(mgmt->frame_control))
2536 return RX_CONTINUE;
2537
2538 /*
2539 * For AP mode, hostapd is responsible for handling any action
2540 * frames that we didn't handle, including returning unknown
2541 * ones. For all other modes we will return them to the sender,
2542 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2543 * 802.11-2012 9.24.4.
2e161f78
JB		 2544 * Newer versions of hostapd shall also use the management frame
2545 * registration mechanisms, but older ones still use cooked
2546 * monitor interfaces so push all frames there.
2547 */
554891e6 2548 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2549 (sdata->vif.type == NL80211_IFTYPE_AP ||
2550 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2551 return RX_DROP_MONITOR;
026331c4 2552
4b5ebccc
JB		 2553 if (is_multicast_ether_addr(mgmt->da))
2554 return RX_DROP_MONITOR;
2555
84040805
JB		 2556 /* do not return rejected action frames */
2557 if (mgmt->u.action.category & 0x80)
2558 return RX_DROP_UNUSABLE;
2559
2560 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2561 GFP_ATOMIC);
2562 if (nskb) {
292b4df6 2563 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2564
292b4df6
JL		 2565 nmgmt->u.action.category |= 0x80;
2566 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2567 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2568
2569 memset(nskb->cb, 0, sizeof(nskb->cb));
2570
2571 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2572 }
39192c0b
JB		 2573 dev_kfree_skb(rx->skb);
2574 return RX_QUEUED;
de1ede7a
JB		 2575}
2576
49461622 2577static ieee80211_rx_result debug_noinline
5cf121c3 2578ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2579{
eb9fb5b8 2580 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2581 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2582 __le16 stype;
571ecf67 2583
77a121c3 2584 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2585
77a121c3
JB		 2586 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2587 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2588 sdata->vif.type != NL80211_IFTYPE_STATION)
2589 return RX_DROP_MONITOR;
472dbc45 2590
77a121c3 2591 switch (stype) {
66e67e41 2592 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2593 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2594 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2595 /* process for all: mesh, mlme, ibss */
2596 break;
66e67e41
JB		 2597 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2598 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2599 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2600 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2601 if (is_multicast_ether_addr(mgmt->da) &&
2602 !is_broadcast_ether_addr(mgmt->da))
2603 return RX_DROP_MONITOR;
2604
77a121c3
JB		 2605 /* process only for station */
2606 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2607 return RX_DROP_MONITOR;
2608 break;
2609 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2610 /* process only for ibss */
2611 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2612 return RX_DROP_MONITOR;
2613 break;
2614 default:
2615 return RX_DROP_MONITOR;
2616 }
f9d540ee 2617
77a121c3 2618 /* queue up frame and kick off work to process it */
c1475ca9 2619 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2620 skb_queue_tail(&sdata->skb_queue, rx->skb);
2621 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2622 if (rx->sta)
2623 rx->sta->rx_packets++;
46900298 2624
77a121c3 2625 return RX_QUEUED;
571ecf67
JB		 2626}
2627
5cf121c3 2628/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2629static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2630 struct ieee80211_rate *rate)
3d30d949
MW		 2631{
2632 struct ieee80211_sub_if_data *sdata;
2633 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2634 struct sk_buff *skb = rx->skb, *skb2;
2635 struct net_device *prev_dev = NULL;
eb9fb5b8 2636 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2637 int needed_headroom;
3d30d949 2638
554891e6
JB		 2639 /*
2640 * If cooked monitor has been processed already, then
2641 * don't do it again. If not, set the flag.
2642 */
2643 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2644 goto out_free_skb;
554891e6 2645 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2646
152c477a
JB		 2647 /* If there are no cooked monitor interfaces, just free the SKB */
2648 if (!local->cooked_mntrs)
2649 goto out_free_skb;
2650
293702a3 2651 /* room for the radiotap header based on driver features */
90b9e446 2652 needed_headroom = ieee80211_rx_radiotap_space(local, status);
3d30d949 2653
293702a3
JB		 2654 if (skb_headroom(skb) < needed_headroom &&
2655 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2656 goto out_free_skb;
3d30d949 2657
293702a3 2658 /* prepend radiotap information */
973ef21a
FF		 2659 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2660 false);
3d30d949
MW		 2661
2662 skb_set_mac_header(skb, 0);
2663 skb->ip_summed = CHECKSUM_UNNECESSARY;
2664 skb->pkt_type = PACKET_OTHERHOST;
2665 skb->protocol = htons(ETH_P_802_2);
2666
2667 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2668 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2669 continue;
2670
05c914fe 2671 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2672 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2673 continue;
2674
2675 if (prev_dev) {
2676 skb2 = skb_clone(skb, GFP_ATOMIC);
2677 if (skb2) {
2678 skb2->dev = prev_dev;
5548a8a1 2679 netif_receive_skb(skb2);
3d30d949
MW		 2680 }
2681 }
2682
2683 prev_dev = sdata->dev;
2684 sdata->dev->stats.rx_packets++;
2685 sdata->dev->stats.rx_bytes += skb->len;
2686 }
2687
2688 if (prev_dev) {
2689 skb->dev = prev_dev;
5548a8a1 2690 netif_receive_skb(skb);
554891e6
JB		 2691 return;
2692 }
3d30d949
MW		 2693
2694 out_free_skb:
2695 dev_kfree_skb(skb);
2696}
2697
aa0c8636
CL		 2698static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2699 ieee80211_rx_result res)
2700{
2701 switch (res) {
2702 case RX_DROP_MONITOR:
2703 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2704 if (rx->sta)
2705 rx->sta->rx_dropped++;
2706 /* fall through */
2707 case RX_CONTINUE: {
2708 struct ieee80211_rate *rate = NULL;
2709 struct ieee80211_supported_band *sband;
2710 struct ieee80211_rx_status *status;
2711
2712 status = IEEE80211_SKB_RXCB((rx->skb));
2713
2714 sband = rx->local->hw.wiphy->bands[status->band];
5614618e
JB		 2715 if (!(status->flag & RX_FLAG_HT) &&
2716 !(status->flag & RX_FLAG_VHT))
aa0c8636
CL		 2717 rate = &sband->bitrates[status->rate_idx];
2718
2719 ieee80211_rx_cooked_monitor(rx, rate);
2720 break;
2721 }
2722 case RX_DROP_UNUSABLE:
2723 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2724 if (rx->sta)
2725 rx->sta->rx_dropped++;
2726 dev_kfree_skb(rx->skb);
2727 break;
2728 case RX_QUEUED:
2729 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2730 break;
2731 }
2732}
571ecf67 2733
24a8fdad 2734static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2735{
58905290 2736 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2737 struct sk_buff *skb;
8944b79f 2738
e32f85f7
LCC		 2739#define CALL_RXH(rxh) \
2740 do { \
2741 res = rxh(rx); \
2742 if (res != RX_CONTINUE) \
2569a826 2743 goto rxh_next; \
e32f85f7 2744 } while (0);
49461622 2745
24a8fdad
CL		 2746 spin_lock(&rx->local->rx_skb_queue.lock);
2747 if (rx->local->running_rx_handler)
2748 goto unlock;
2749
2750 rx->local->running_rx_handler = true;
2751
2752 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2753 spin_unlock(&rx->local->rx_skb_queue.lock);
2754
2569a826
JB		 2755 /*
2756 * all the other fields are valid across frames
2757 * that belong to an aMPDU since they are on the
2758 * same TID from the same station
2759 */
2760 rx->skb = skb;
2761
2762 CALL_RXH(ieee80211_rx_h_decrypt)
2763 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2764 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2765 CALL_RXH(ieee80211_rx_h_sta_process)
2766 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2767 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2768 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2769#ifdef CONFIG_MAC80211_MESH
aa0c8636 2770 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2771 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2772#endif
2154c81c 2773 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2774 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2775 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2776 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2777 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2778 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2779 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2780 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2781
aa0c8636
CL		 2782 rxh_next:
2783 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2784 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2785#undef CALL_RXH
aa0c8636 2786 }
24a8fdad
CL		 2787
2788 rx->local->running_rx_handler = false;
2789
2790 unlock:
2791 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2792}
2793
4406c376 2794static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2795{
aa0c8636
CL		 2796 ieee80211_rx_result res = RX_DROP_MONITOR;
2797
aa0c8636
CL		 2798#define CALL_RXH(rxh) \
2799 do { \
2800 res = rxh(rx); \
2801 if (res != RX_CONTINUE) \
2802 goto rxh_next; \
2803 } while (0);
2804
aa0c8636
CL		 2805 CALL_RXH(ieee80211_rx_h_check)
2806
24a8fdad 2807 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2808
24a8fdad 2809 ieee80211_rx_handlers(rx);
aa0c8636 2810 return;
49461622 2811
2569a826 2812 rxh_next:
aa0c8636
CL		 2813 ieee80211_rx_handlers_result(rx, res);
2814
2815#undef CALL_RXH
58905290
JB		 2816}
2817
2bff8ebf 2818/*
dd318575
JB		 2819 * This function makes calls into the RX path, therefore
2820 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2821 */
2822void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2823{
554891e6
JB		 2824 struct ieee80211_rx_data rx = {
2825 .sta = sta,
2826 .sdata = sta->sdata,
2827 .local = sta->local,
9e26297a
JB		 2828 /* This is OK -- must be QoS data frame */
2829 .security_idx = tid,
2830 .seqno_idx = tid,
fcf8bd3b 2831 .flags = 0,
554891e6 2832 };
2c15a0cf
CL		 2833 struct tid_ampdu_rx *tid_agg_rx;
2834
2835 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2836 if (!tid_agg_rx)
2837 return;
2bff8ebf 2838
2c15a0cf 2839 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2840 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2841 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2842
24a8fdad 2843 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2844}
2845
571ecf67
JB		 2846/* main receive path */
2847
20b01f80 2848static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2849 struct ieee80211_hdr *hdr)
2850{
20b01f80 2851 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2852 struct sk_buff *skb = rx->skb;
2853 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2854 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2855 int multicast = is_multicast_ether_addr(hdr->addr1);
2856
51fb61e7 2857 switch (sdata->vif.type) {
05c914fe 2858 case NL80211_IFTYPE_STATION:
9bc383de 2859 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2860 return 0;
77fdaa12 2861 if (!multicast &&
b203ca39 2862 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2863 if (!(sdata->dev->flags & IFF_PROMISC) ||
2864 sdata->u.mgd.use_4addr)
23a24def 2865 return 0;
554891e6 2866 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2867 }
2868 break;
05c914fe 2869 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2870 if (!bssid)
2871 return 0;
a7767f95 2872 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2873 return 1;
d48b2968
JB		 2874 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2875 return 0;
23a24def 2876 } else if (!multicast &&
b203ca39 2877 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2878 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2879 return 0;
554891e6 2880 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2881 } else if (!rx->sta) {
2882 int rate_idx;
5614618e
JB		 2883 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
2884 rate_idx = 0; /* TODO: HT/VHT rates */
0fb8ca45 2885 else
eb9fb5b8 2886 rate_idx = status->rate_idx;
8bf11d8d
JB		 2887 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2888 BIT(rate_idx));
0fb8ca45 2889 }
23a24def 2890 break;
05c914fe 2891 case NL80211_IFTYPE_MESH_POINT:
6032f934 2892 if (!multicast &&
b203ca39 2893 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2894 if (!(sdata->dev->flags & IFF_PROMISC))
2895 return 0;
2896
554891e6 2897 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2898 }
2899 break;
05c914fe
JB		 2900 case NL80211_IFTYPE_AP_VLAN:
2901 case NL80211_IFTYPE_AP:
23a24def 2902 if (!bssid) {
b203ca39 2903 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2904 return 0;
f142c6b9 2905 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2906 /*
2907 * Accept public action frames even when the
2908 * BSSID doesn't match, this is used for P2P
2909 * and location updates. Note that mac80211
2910 * itself never looks at these frames.
2911 */
d48b2968 2912 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2913 return 1;
d48b2968 2914 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2915 return 0;
554891e6 2916 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2917 }
23a24def 2918 break;
05c914fe 2919 case NL80211_IFTYPE_WDS:
a7767f95 2920 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2921 return 0;
b203ca39 2922 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2923 return 0;
2924 break;
f142c6b9
JB		 2925 case NL80211_IFTYPE_P2P_DEVICE:
2926 if (!ieee80211_is_public_action(hdr, skb->len) &&
2927 !ieee80211_is_probe_req(hdr->frame_control) &&
2928 !ieee80211_is_probe_resp(hdr->frame_control) &&
2929 !ieee80211_is_beacon(hdr->frame_control))
2930 return 0;
2931 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2932 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2933 break;
2ca27bcf 2934 default:
fb1c1cd6 2935 /* should never get here */
f142c6b9 2936 WARN_ON_ONCE(1);
fb1c1cd6 2937 break;
23a24def
JB		 2938 }
2939
2940 return 1;
2941}
2942
4406c376
JB		 2943/*
2944 * This function returns whether or not the SKB
2945 * was destined for RX processing or not, which,
2946 * if consume is true, is equivalent to whether
2947 * or not the skb was consumed.
2948 */
2949static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2950 struct sk_buff *skb, bool consume)
2951{
2952 struct ieee80211_local *local = rx->local;
2953 struct ieee80211_sub_if_data *sdata = rx->sdata;
2954 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2955 struct ieee80211_hdr *hdr = (void *)skb->data;
2956 int prepares;
2957
2958 rx->skb = skb;
554891e6 2959 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2960 prepares = prepare_for_handlers(rx, hdr);
2961
2962 if (!prepares)
2963 return false;
2964
4406c376
JB		 2965 if (!consume) {
2966 skb = skb_copy(skb, GFP_ATOMIC);
2967 if (!skb) {
2968 if (net_ratelimit())
2969 wiphy_debug(local->hw.wiphy,
b305dae4 2970 "failed to copy skb for %s\n",
4406c376
JB		 2971 sdata->name);
2972 return true;
2973 }
2974
2975 rx->skb = skb;
2976 }
2977
2978 ieee80211_invoke_rx_handlers(rx);
2979 return true;
2980}
2981
571ecf67 2982/*
6368e4b1
RR		 2983 * This is the actual Rx frames handler. as it blongs to Rx path it must
2984 * be called with rcu_read_lock protection.
571ecf67 2985 */
71ebb4aa 2986static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2987 struct sk_buff *skb)
571ecf67
JB		 2988{
2989 struct ieee80211_local *local = hw_to_local(hw);
2990 struct ieee80211_sub_if_data *sdata;
571ecf67 2991 struct ieee80211_hdr *hdr;
e3cf8b3f 2992 __le16 fc;
5cf121c3 2993 struct ieee80211_rx_data rx;
4406c376 2994 struct ieee80211_sub_if_data *prev;
56af3268 2995 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2996 int err = 0;
571ecf67 2997
e3cf8b3f 2998 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2999 memset(&rx, 0, sizeof(rx));
3000 rx.skb = skb;
3001 rx.local = local;
72abd81b 3002
e3cf8b3f 3003 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 3004 local->dot11ReceivedFragmentCount++;
571ecf67 3005
4a4f1a58
JB		 3006 if (ieee80211_is_mgmt(fc)) {
3007 /* drop frame if too short for header */
3008 if (skb->len < ieee80211_hdrlen(fc))
3009 err = -ENOBUFS;
3010 else
3011 err = skb_linearize(skb);
3012 } else {
e3cf8b3f 3013 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 3014 }
e3cf8b3f
ZY		 3015
3016 if (err) {
3017 dev_kfree_skb(skb);
3018 return;
3019 }
3020
3021 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 3022 ieee80211_parse_qos(&rx);
d1c3a37c 3023 ieee80211_verify_alignment(&rx);
38f3714d 3024
d48b2968
JB		 3025 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3026 ieee80211_is_beacon(hdr->frame_control)))
3027 ieee80211_scan_rx(local, skb);
3028
e3cf8b3f 3029 if (ieee80211_is_data(fc)) {
56af3268 3030 prev_sta = NULL;
4406c376 3031
7852e361 3032 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 3033 if (!prev_sta) {
3034 prev_sta = sta;
3035 continue;
3036 }
3037
3038 rx.sta = prev_sta;
3039 rx.sdata = prev_sta->sdata;
4406c376 3040 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 3041
56af3268 3042 prev_sta = sta;
4406c376 3043 }
56af3268
BG		 3044
3045 if (prev_sta) {
3046 rx.sta = prev_sta;
3047 rx.sdata = prev_sta->sdata;
3048
4406c376 3049 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 3050 return;
8e26d5ad 3051 goto out;
56af3268 3052 }
4406c376
JB		 3053 }
3054
4b0dd98e 3055 prev = NULL;
b2e7771e 3056
4b0dd98e
JB		 3057 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3058 if (!ieee80211_sdata_running(sdata))
3059 continue;
340e11f3 3060
4b0dd98e
JB		 3061 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3062 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3063 continue;
340e11f3 3064
4b0dd98e
JB		 3065 /*
3066 * frame is destined for this interface, but if it's
3067 * not also for the previous one we handle that after
3068 * the loop to avoid copying the SKB once too much
3069 */
4bb29f8c 3070
4b0dd98e 3071 if (!prev) {
abe60632 3072 prev = sdata;
4b0dd98e 3073 continue;
340e11f3 3074 }
4bb29f8c 3075
7852e361 3076 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3077 rx.sdata = prev;
3078 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3079
4b0dd98e
JB		 3080 prev = sdata;
3081 }
3082
3083 if (prev) {
7852e361 3084 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3085 rx.sdata = prev;
4406c376 3086
4b0dd98e
JB		 3087 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3088 return;
571ecf67 3089 }
4406c376 3090
8e26d5ad 3091 out:
4406c376 3092 dev_kfree_skb(skb);
571ecf67 3093}
6368e4b1
RR		 3094
3095/*
3096 * This is the receive path handler. It is called by a low level driver when an
3097 * 802.11 MPDU is received from the hardware.
3098 */
103bf9f7 3099void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3100{
3101 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3102 struct ieee80211_rate *rate = NULL;
3103 struct ieee80211_supported_band *sband;
f1d58c25 3104 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3105
d20ef63d
JB		 3106 WARN_ON_ONCE(softirq_count() == 0);
3107
444e3803 3108 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3109 goto drop;
8318d78a
JB		 3110
3111 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3112 if (WARN_ON(!sband))
3113 goto drop;
8318d78a 3114
89c3a8ac
JB		 3115 /*
3116 * If we're suspending, it is possible although not too likely
3117 * that we'd be receiving frames after having already partially
3118 * quiesced the stack. We can't process such frames then since
3119 * that might, for example, cause stations to be added or other
3120 * driver callbacks be invoked.
3121 */
77a980dc
JB		 3122 if (unlikely(local->quiescing || local->suspended))
3123 goto drop;
89c3a8ac 3124
04800ada
AN		 3125 /* We might be during a HW reconfig, prevent Rx for the same reason */
3126 if (unlikely(local->in_reconfig))
3127 goto drop;
3128
ea77f12f
JB		 3129 /*
3130 * The same happens when we're not even started,
3131 * but that's worth a warning.
3132 */
77a980dc
JB		 3133 if (WARN_ON(!local->started))
3134 goto drop;
ea77f12f 3135
fc885189 3136 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3137 /*
fc885189
JB		 3138 * Validate the rate, unless a PLCP error means that
3139 * we probably can't have a valid rate here anyway.
e5d6eb83 3140 */
fc885189
JB		 3141
3142 if (status->flag & RX_FLAG_HT) {
3143 /*
3144 * rate_idx is MCS index, which can be [0-76]
3145 * as documented on:
3146 *
3147 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3148 *
3149 * Anything else would be some sort of driver or
3150 * hardware error. The driver should catch hardware
3151 * errors.
3152 */
444e3803 3153 if (WARN(status->rate_idx > 76,
fc885189
JB		 3154 "Rate marked as an HT rate but passed "
3155 "status->rate_idx is not "
3156 "an MCS index [0-76]: %d (0x%02x)\n",
3157 status->rate_idx,
3158 status->rate_idx))
3159 goto drop;
5614618e
JB		 3160 } else if (status->flag & RX_FLAG_VHT) {
3161 if (WARN_ONCE(status->rate_idx > 9 ||
3162 !status->vht_nss ||
3163 status->vht_nss > 8,
3164 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3165 status->rate_idx, status->vht_nss))
3166 goto drop;
fc885189 3167 } else {
444e3803 3168 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3169 goto drop;
3170 rate = &sband->bitrates[status->rate_idx];
3171 }
0fb8ca45 3172 }
6368e4b1 3173
554891e6
JB		 3174 status->rx_flags = 0;
3175
6368e4b1
RR		 3176 /*
3177 * key references and virtual interfaces are protected using RCU
3178 * and this requires that we are in a read-side RCU section during
3179 * receive processing
3180 */
3181 rcu_read_lock();
3182
3183 /*
3184 * Frames with failed FCS/PLCP checksum are not returned,
3185 * all other frames are returned without radiotap header
3186 * if it was previously present.
3187 * Also, frames with less than 16 bytes are dropped.
3188 */
f1d58c25 3189 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3190 if (!skb) {
3191 rcu_read_unlock();
3192 return;
3193 }
3194
e1e54068
JB		 3195 ieee80211_tpt_led_trig_rx(local,
3196 ((struct ieee80211_hdr *)skb->data)->frame_control,
3197 skb->len);
071d9ac2 3198 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3199
3200 rcu_read_unlock();
77a980dc
JB		 3201
3202 return;
3203 drop:
3204 kfree_skb(skb);
6368e4b1 3205}
103bf9f7 3206EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3207
3208/* This is a version of the rx handler that can be called from hard irq
3209 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3210void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3211{
3212 struct ieee80211_local *local = hw_to_local(hw);
3213
3214 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3215
571ecf67
JB		 3216 skb->pkt_type = IEEE80211_RX_MSG;
3217 skb_queue_tail(&local->skb_queue, skb);
3218 tasklet_schedule(&local->tasklet);
3219}
3220EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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