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nl/cfg80211: force scan using an AP vif if requested
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
e3cf8b3f 45 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
f1d58c25 57static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 58 int present_fcs_len)
b2e7771e 59{
f1d58c25 60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e 62
4c298677
JB		 63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
64 RX_FLAG_FAILED_PLCP_CRC |
65 RX_FLAG_AMPDU_IS_ZEROLEN))
b2e7771e 66 return 1;
0869aea0 67 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 68 return 1;
87228f57
HH		 69 if (ieee80211_is_ctl(hdr->frame_control) &&
70 !ieee80211_is_pspoll(hdr->frame_control) &&
71 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 72 return 1;
73 return 0;
74}
75
601ae7f2
BR		 76static int
77ieee80211_rx_radiotap_len(struct ieee80211_local *local,
78 struct ieee80211_rx_status *status)
79{
80 int len;
81
82 /* always present fields */
83 len = sizeof(struct ieee80211_radiotap_header) + 9;
84
6ebacbb7 85 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 86 len += 8;
7fee5372 87 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 88 len += 1;
601ae7f2
BR		 89
90 if (len & 1) /* padding for RX_FLAGS if necessary */
91 len++;
92
6d744bac
JB		 93 if (status->flag & RX_FLAG_HT) /* HT info */
94 len += 3;
95
4c298677
JB		 96 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
97 /* padding */
98 while (len & 3)
99 len++;
100 len += 8;
101 }
102
601ae7f2
BR		 103 return len;
104}
105
00ea6deb 106/*
601ae7f2
BR		 107 * ieee80211_add_rx_radiotap_header - add radiotap header
108 *
109 * add a radiotap header containing all the fields which the hardware provided.
110 */
111static void
112ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
113 struct sk_buff *skb,
601ae7f2 114 struct ieee80211_rate *rate,
973ef21a 115 int rtap_len, bool has_fcs)
601ae7f2 116{
f1d58c25 117 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 118 struct ieee80211_radiotap_header *rthdr;
119 unsigned char *pos;
6a86b9c7 120 u16 rx_flags = 0;
601ae7f2
BR		 121
122 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
123 memset(rthdr, 0, rtap_len);
124
125 /* radiotap header, set always present flags */
126 rthdr->it_present =
127 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 128 (1 << IEEE80211_RADIOTAP_CHANNEL) |
129 (1 << IEEE80211_RADIOTAP_ANTENNA) |
130 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
131 rthdr->it_len = cpu_to_le16(rtap_len);
132
133 pos = (unsigned char *)(rthdr+1);
134
135 /* the order of the following fields is important */
136
137 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 138 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 139 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 140 rthdr->it_present |=
141 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
142 pos += 8;
143 }
144
145 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 146 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 147 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 148 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
149 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 150 if (status->flag & RX_FLAG_SHORTPRE)
151 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 152 pos++;
153
154 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 155 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 156 /*
f8d1ccf1 157 * Without rate information don't add it. If we have,
38f37be2 158 * MCS information is a separate field in radiotap,
73b48099
JB		 159 * added below. The byte here is needed as padding
160 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 161 */
162 *pos = 0;
8d6f658e 163 } else {
ebe6c7ba 164 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 165 *pos = rate->bitrate / 5;
8d6f658e 166 }
601ae7f2
BR		 167 pos++;
168
169 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 170 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 171 pos += 2;
172 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 173 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
174 pos);
5f0b7de5
JB		 175 else if (status->flag & RX_FLAG_HT)
176 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
177 pos);
f8d1ccf1 178 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 179 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
180 pos);
f8d1ccf1 181 else if (rate)
6a86b9c7
JB		 182 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
183 pos);
f8d1ccf1
JB		 184 else
185 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 186 pos += 2;
187
188 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 189 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
190 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 191 *pos = status->signal;
192 rthdr->it_present |=
193 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
194 pos++;
195 }
196
601ae7f2
BR		 197 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
198
199 /* IEEE80211_RADIOTAP_ANTENNA */
200 *pos = status->antenna;
201 pos++;
202
601ae7f2
BR		 203 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
204
205 /* IEEE80211_RADIOTAP_RX_FLAGS */
206 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 207 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 208 pos++;
aae89831 209 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 210 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
211 put_unaligned_le16(rx_flags, pos);
601ae7f2 212 pos += 2;
6d744bac
JB		 213
214 if (status->flag & RX_FLAG_HT) {
215 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 216 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 217 *pos = 0;
218 if (status->flag & RX_FLAG_SHORT_GI)
219 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
220 if (status->flag & RX_FLAG_40MHZ)
221 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 222 if (status->flag & RX_FLAG_HT_GF)
223 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
6d744bac
JB		 224 pos++;
225 *pos++ = status->rate_idx;
226 }
4c298677
JB		 227
228 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
229 u16 flags = 0;
230
231 /* ensure 4 byte alignment */
232 while ((pos - (u8 *)rthdr) & 3)
233 pos++;
234 rthdr->it_present |=
235 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
236 put_unaligned_le32(status->ampdu_reference, pos);
237 pos += 4;
238 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
239 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
240 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
241 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
242 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
243 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
244 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
245 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
246 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
247 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
248 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
249 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
250 put_unaligned_le16(flags, pos);
251 pos += 2;
252 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
253 *pos++ = status->ampdu_delimiter_crc;
254 else
255 *pos++ = 0;
256 *pos++ = 0;
257 }
601ae7f2
BR		 258}
259
b2e7771e
JB		 260/*
261 * This function copies a received frame to all monitor interfaces and
262 * returns a cleaned-up SKB that no longer includes the FCS nor the
263 * radiotap header the driver might have added.
264 */
265static struct sk_buff *
266ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 267 struct ieee80211_rate *rate)
b2e7771e 268{
f1d58c25 269 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 270 struct ieee80211_sub_if_data *sdata;
293702a3 271 int needed_headroom;
b2e7771e
JB		 272 struct sk_buff *skb, *skb2;
273 struct net_device *prev_dev = NULL;
274 int present_fcs_len = 0;
b2e7771e
JB		 275
276 /*
277 * First, we may need to make a copy of the skb because
278 * (1) we need to modify it for radiotap (if not present), and
279 * (2) the other RX handlers will modify the skb we got.
280 *
281 * We don't need to, of course, if we aren't going to return
282 * the SKB because it has a bad FCS/PLCP checksum.
283 */
0869aea0
JB		 284
285 /* room for the radiotap header based on driver features */
286 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 287
288 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
289 present_fcs_len = FCS_LEN;
290
e3cf8b3f
ZY		 291 /* make sure hdr->frame_control is on the linear part */
292 if (!pskb_may_pull(origskb, 2)) {
293 dev_kfree_skb(origskb);
294 return NULL;
295 }
296
b2e7771e 297 if (!local->monitors) {
0869aea0 298 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 299 dev_kfree_skb(origskb);
300 return NULL;
301 }
302
0869aea0 303 return remove_monitor_info(local, origskb);
b2e7771e
JB		 304 }
305
0869aea0 306 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 307 /* only need to expand headroom if necessary */
308 skb = origskb;
309 origskb = NULL;
310
311 /*
312 * This shouldn't trigger often because most devices have an
313 * RX header they pull before we get here, and that should
314 * be big enough for our radiotap information. We should
315 * probably export the length to drivers so that we can have
316 * them allocate enough headroom to start with.
317 */
318 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 319 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 320 dev_kfree_skb(skb);
321 return NULL;
322 }
323 } else {
324 /*
325 * Need to make a copy and possibly remove radiotap header
326 * and FCS from the original.
327 */
328 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
329
0869aea0 330 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 331
332 if (!skb)
333 return origskb;
334 }
335
0869aea0 336 /* prepend radiotap information */
973ef21a
FF		 337 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
338 true);
b2e7771e 339
ce3edf6d 340 skb_reset_mac_header(skb);
b2e7771e
JB		 341 skb->ip_summed = CHECKSUM_UNNECESSARY;
342 skb->pkt_type = PACKET_OTHERHOST;
343 skb->protocol = htons(ETH_P_802_2);
344
345 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 346 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 347 continue;
348
3d30d949
MW		 349 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
350 continue;
351
9607e6b6 352 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 353 continue;
354
b2e7771e
JB		 355 if (prev_dev) {
356 skb2 = skb_clone(skb, GFP_ATOMIC);
357 if (skb2) {
358 skb2->dev = prev_dev;
5548a8a1 359 netif_receive_skb(skb2);
b2e7771e
JB		 360 }
361 }
362
363 prev_dev = sdata->dev;
364 sdata->dev->stats.rx_packets++;
365 sdata->dev->stats.rx_bytes += skb->len;
366 }
367
368 if (prev_dev) {
369 skb->dev = prev_dev;
5548a8a1 370 netif_receive_skb(skb);
b2e7771e
JB		 371 } else
372 dev_kfree_skb(skb);
373
374 return origskb;
375}
376
377
5cf121c3 378static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 379{
238f74a2 380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 381 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 382 int tid, seqno_idx, security_idx;
6e0d114d
JB		 383
384 /* does the frame have a qos control field? */
238f74a2
HH		 385 if (ieee80211_is_data_qos(hdr->frame_control)) {
386 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 387 /* frame has qos control */
238f74a2 388 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 389 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 390 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 391
392 seqno_idx = tid;
393 security_idx = tid;
6e0d114d 394 } else {
1411f9b5
JB		 395 /*
396 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
397 *
398 * Sequence numbers for management frames, QoS data
399 * frames with a broadcast/multicast address in the
400 * Address 1 field, and all non-QoS data frames sent
401 * by QoS STAs are assigned using an additional single
402 * modulo-4096 counter, [...]
403 *
404 * We also use that counter for non-QoS STAs.
405 */
9e26297a
JB		 406 seqno_idx = NUM_RX_DATA_QUEUES;
407 security_idx = 0;
408 if (ieee80211_is_mgmt(hdr->frame_control))
409 security_idx = NUM_RX_DATA_QUEUES;
410 tid = 0;
6e0d114d 411 }
52865dfd 412
9e26297a
JB		 413 rx->seqno_idx = seqno_idx;
414 rx->security_idx = security_idx;
6e0d114d
JB		 415 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
416 * For now, set skb->priority to 0 for other cases. */
417 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 418}
6e0d114d 419
d1c3a37c
JB		 420/**
421 * DOC: Packet alignment
422 *
423 * Drivers always need to pass packets that are aligned to two-byte boundaries
424 * to the stack.
425 *
426 * Additionally, should, if possible, align the payload data in a way that
427 * guarantees that the contained IP header is aligned to a four-byte
428 * boundary. In the case of regular frames, this simply means aligning the
429 * payload to a four-byte boundary (because either the IP header is directly
430 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 431 * in front of it). If the payload data is not properly aligned and the
432 * architecture doesn't support efficient unaligned operations, mac80211
433 * will align the data.
d1c3a37c
JB		 434 *
435 * With A-MSDU frames, however, the payload data address must yield two modulo
436 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
437 * push the IP header further back to a multiple of four again. Thankfully, the
438 * specs were sane enough this time around to require padding each A-MSDU
439 * subframe to a length that is a multiple of four.
440 *
25985edc 441 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 442 * the payload is not supported, the driver is required to move the 802.11
443 * header to be directly in front of the payload in that case.
444 */
445static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 446{
59d9cb07
KV		 447#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
448 WARN_ONCE((unsigned long)rx->skb->data & 1,
449 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 450#endif
6e0d114d
JB		 451}
452
6368e4b1 453
571ecf67
JB		 454/* rx handlers */
455
3cfcf6ac
JM		 456static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
457{
458 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
459
460 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
461 return 0;
462
463 return ieee80211_is_robust_mgmt_frame(hdr);
464}
465
466
467static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
468{
469 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
470
471 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
472 return 0;
473
474 return ieee80211_is_robust_mgmt_frame(hdr);
475}
476
477
478/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
479static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
480{
481 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
482 struct ieee80211_mmie *mmie;
483
484 if (skb->len < 24 + sizeof(*mmie) ||
485 !is_multicast_ether_addr(hdr->da))
486 return -1;
487
488 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
489 return -1; /* not a robust management frame */
490
491 mmie = (struct ieee80211_mmie *)
492 (skb->data + skb->len - sizeof(*mmie));
493 if (mmie->element_id != WLAN_EID_MMIE ||
494 mmie->length != sizeof(*mmie) - 2)
495 return -1;
496
497 return le16_to_cpu(mmie->key_id);
498}
499
500
33b64eb2 501static ieee80211_rx_result
5cf121c3 502ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 503{
a7767f95 504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 505 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 506
a7767f95 507 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 508 if (is_multicast_ether_addr(hdr->addr1)) {
509 if (ieee80211_has_tods(hdr->frame_control) ||
510 !ieee80211_has_fromds(hdr->frame_control))
511 return RX_DROP_MONITOR;
b203ca39 512 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 513 return RX_DROP_MONITOR;
514 } else {
515 if (!ieee80211_has_a4(hdr->frame_control))
516 return RX_DROP_MONITOR;
b203ca39 517 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 518 return RX_DROP_MONITOR;
519 }
33b64eb2
LCC		 520 }
521
522 /* If there is not an established peer link and this is not a peer link
523 * establisment frame, beacon or probe, drop the frame.
524 */
525
57cf8043 526 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 527 struct ieee80211_mgmt *mgmt;
d6d1a5a7 528
a7767f95 529 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 530 return RX_DROP_MONITOR;
531
a7767f95 532 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 533 u8 category;
33b64eb2 534 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 535 category = mgmt->u.action.category;
536 if (category != WLAN_CATEGORY_MESH_ACTION &&
537 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 538 return RX_DROP_MONITOR;
33b64eb2 539 return RX_CONTINUE;
33b64eb2
LCC		 540 }
541
a7767f95
HH		 542 if (ieee80211_is_probe_req(hdr->frame_control) ||
543 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 544 ieee80211_is_beacon(hdr->frame_control) ||
545 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 546 return RX_CONTINUE;
547
548 return RX_DROP_MONITOR;
549
550 }
551
902acc78
JB		 552 return RX_CONTINUE;
553}
33b64eb2 554
1edfb1af
JB		 555#define SEQ_MODULO 0x1000
556#define SEQ_MASK 0xfff
557
558static inline int seq_less(u16 sq1, u16 sq2)
559{
560 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
561}
562
563static inline u16 seq_inc(u16 sq)
564{
565 return (sq + 1) & SEQ_MASK;
566}
567
568static inline u16 seq_sub(u16 sq1, u16 sq2)
569{
570 return (sq1 - sq2) & SEQ_MASK;
571}
572
573
d3b2fb53 574static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 575 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 576 int index)
1edfb1af 577{
d3b2fb53 578 struct ieee80211_local *local = sdata->local;
1edfb1af 579 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 580 struct ieee80211_rx_status *status;
1edfb1af 581
dd318575
JB		 582 lockdep_assert_held(&tid_agg_rx->reorder_lock);
583
1edfb1af
JB		 584 if (!skb)
585 goto no_frame;
586
071d9ac2 587 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 588 tid_agg_rx->stored_mpdu_num--;
589 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 590 status = IEEE80211_SKB_RXCB(skb);
591 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 592 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 593
594no_frame:
595 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
596}
597
d3b2fb53 598static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 599 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 600 u16 head_seq_num)
1edfb1af
JB		 601{
602 int index;
603
dd318575
JB		 604 lockdep_assert_held(&tid_agg_rx->reorder_lock);
605
1edfb1af
JB		 606 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
607 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
608 tid_agg_rx->buf_size;
d3b2fb53 609 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
1edfb1af
JB		 610 }
611}
612
613/*
614 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
615 * the skb was added to the buffer longer than this time ago, the earlier
616 * frames that have not yet been received are assumed to be lost and the skb
617 * can be released for processing. This may also release other skb's from the
618 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 619 *
620 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 621 */
622#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
623
d3b2fb53 624static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
24a8fdad 625 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 626{
2bff8ebf 627 int index, j;
aa0c8636 628
dd318575
JB		 629 lockdep_assert_held(&tid_agg_rx->reorder_lock);
630
aa0c8636
CL		 631 /* release the buffer until next missing frame */
632 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
633 tid_agg_rx->buf_size;
634 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 635 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 636 /*
637 * No buffers ready to be released, but check whether any
638 * frames in the reorder buffer have timed out.
639 */
aa0c8636
CL		 640 int skipped = 1;
641 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
642 j = (j + 1) % tid_agg_rx->buf_size) {
643 if (!tid_agg_rx->reorder_buf[j]) {
644 skipped++;
645 continue;
646 }
499fe9a4
DH		 647 if (skipped &&
648 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 649 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 650 goto set_release_timer;
aa0c8636 651
bdcbd8e0
JB		 652 ht_dbg_ratelimited(sdata,
653 "release an RX reorder frame due to timeout on earlier frames\n");
d3b2fb53 654 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
aa0c8636
CL		 655
656 /*
657 * Increment the head seq# also for the skipped slots.
658 */
659 tid_agg_rx->head_seq_num =
660 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
661 skipped = 0;
662 }
663 } else while (tid_agg_rx->reorder_buf[index]) {
d3b2fb53 664 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
aa0c8636
CL		 665 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
666 tid_agg_rx->buf_size;
667 }
2bff8ebf
CL		 668
669 if (tid_agg_rx->stored_mpdu_num) {
670 j = index = seq_sub(tid_agg_rx->head_seq_num,
671 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
672
673 for (; j != (index - 1) % tid_agg_rx->buf_size;
674 j = (j + 1) % tid_agg_rx->buf_size) {
675 if (tid_agg_rx->reorder_buf[j])
676 break;
677 }
678
679 set_release_timer:
680
681 mod_timer(&tid_agg_rx->reorder_timer,
334df731 682 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 683 HT_RX_REORDER_BUF_TIMEOUT);
684 } else {
685 del_timer(&tid_agg_rx->reorder_timer);
686 }
aa0c8636
CL		 687}
688
1edfb1af
JB		 689/*
690 * As this function belongs to the RX path it must be under
691 * rcu_read_lock protection. It returns false if the frame
692 * can be processed immediately, true if it was consumed.
693 */
d3b2fb53 694static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 695 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 696 struct sk_buff *skb)
1edfb1af
JB		 697{
698 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
699 u16 sc = le16_to_cpu(hdr->seq_ctrl);
700 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
701 u16 head_seq_num, buf_size;
702 int index;
2bff8ebf 703 bool ret = true;
1edfb1af 704
dd318575
JB		 705 spin_lock(&tid_agg_rx->reorder_lock);
706
1edfb1af
JB		 707 buf_size = tid_agg_rx->buf_size;
708 head_seq_num = tid_agg_rx->head_seq_num;
709
710 /* frame with out of date sequence number */
711 if (seq_less(mpdu_seq_num, head_seq_num)) {
712 dev_kfree_skb(skb);
2bff8ebf 713 goto out;
1edfb1af
JB		 714 }
715
716 /*
717 * If frame the sequence number exceeds our buffering window
718 * size release some previous frames to make room for this one.
719 */
720 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
721 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
722 /* release stored frames up to new head to stack */
d3b2fb53
JB		 723 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
724 head_seq_num);
1edfb1af
JB		 725 }
726
727 /* Now the new frame is always in the range of the reordering buffer */
728
729 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
730
731 /* check if we already stored this frame */
732 if (tid_agg_rx->reorder_buf[index]) {
733 dev_kfree_skb(skb);
2bff8ebf 734 goto out;
1edfb1af
JB		 735 }
736
737 /*
738 * If the current MPDU is in the right order and nothing else
739 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 740 * If it is first but there's something stored, we may be able
741 * to release frames after this one.
1edfb1af
JB		 742 */
743 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
744 tid_agg_rx->stored_mpdu_num == 0) {
745 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 746 ret = false;
747 goto out;
1edfb1af
JB		 748 }
749
750 /* put the frame in the reordering buffer */
751 tid_agg_rx->reorder_buf[index] = skb;
752 tid_agg_rx->reorder_time[index] = jiffies;
753 tid_agg_rx->stored_mpdu_num++;
d3b2fb53 754 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
1edfb1af 755
2bff8ebf
CL		 756 out:
757 spin_unlock(&tid_agg_rx->reorder_lock);
758 return ret;
1edfb1af
JB		 759}
760
761/*
762 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
763 * true if the MPDU was buffered, false if it should be processed.
764 */
24a8fdad 765static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 766{
2569a826
JB		 767 struct sk_buff *skb = rx->skb;
768 struct ieee80211_local *local = rx->local;
1edfb1af 769 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 770 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 771 struct sta_info *sta = rx->sta;
1edfb1af
JB		 772 struct tid_ampdu_rx *tid_agg_rx;
773 u16 sc;
6cc00d54 774 u8 tid, ack_policy;
1edfb1af
JB		 775
776 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 777 goto dont_reorder;
1edfb1af
JB		 778
779 /*
780 * filter the QoS data rx stream according to
781 * STA/TID and check if this STA/TID is on aggregation
782 */
783
1edfb1af 784 if (!sta)
2569a826 785 goto dont_reorder;
1edfb1af 786
6cc00d54
TP		 787 ack_policy = *ieee80211_get_qos_ctl(hdr) &
788 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 789 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
790
a87f736d
JB		 791 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
792 if (!tid_agg_rx)
793 goto dont_reorder;
1edfb1af
JB		 794
795 /* qos null data frames are excluded */
796 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 797 goto dont_reorder;
1edfb1af 798
6cc00d54
TP		 799 /* not part of a BA session */
800 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
801 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
802 goto dont_reorder;
803
660c6a44
TP		 804 /* not actually part of this BA session */
805 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
806 goto dont_reorder;
807
1edfb1af
JB		 808 /* new, potentially un-ordered, ampdu frame - process it */
809
810 /* reset session timer */
811 if (tid_agg_rx->timeout)
12d3952f 812 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 813
814 /* if this mpdu is fragmented - terminate rx aggregation session */
815 sc = le16_to_cpu(hdr->seq_ctrl);
816 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 817 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 818 skb_queue_tail(&rx->sdata->skb_queue, skb);
819 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 820 return;
1edfb1af
JB		 821 }
822
a87f736d
JB		 823 /*
824 * No locking needed -- we will only ever process one
825 * RX packet at a time, and thus own tid_agg_rx. All
826 * other code manipulating it needs to (and does) make
827 * sure that we cannot get to it any more before doing
828 * anything with it.
829 */
d3b2fb53 830 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
2569a826
JB		 831 return;
832
833 dont_reorder:
24a8fdad 834 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 835}
33b64eb2 836
49461622 837static ieee80211_rx_result debug_noinline
5cf121c3 838ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 839{
a7767f95 840 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 841 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 842
843 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
844 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 845 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 846 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 847 hdr->seq_ctrl)) {
554891e6 848 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 849 rx->local->dot11FrameDuplicateCount++;
850 rx->sta->num_duplicates++;
851 }
b1f93314 852 return RX_DROP_UNUSABLE;
571ecf67 853 } else
9e26297a 854 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 855 }
856
571ecf67
JB		 857 if (unlikely(rx->skb->len < 16)) {
858 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 859 return RX_DROP_MONITOR;
571ecf67
JB		 860 }
861
571ecf67
JB		 862 /* Drop disallowed frame classes based on STA auth/assoc state;
863 * IEEE 802.11, Chap 5.5.
864 *
ccd7b362
JB		 865 * mac80211 filters only based on association state, i.e. it drops
866 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 867 * deauth/disassoc frames when needed. In addition, hostapd is
868 * responsible for filtering on both auth and assoc states.
869 */
33b64eb2 870
902acc78 871 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 872 return ieee80211_rx_mesh_check(rx);
33b64eb2 873
a7767f95
HH		 874 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
875 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 876 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 877 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 878 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 879 /*
880 * accept port control frames from the AP even when it's not
881 * yet marked ASSOC to prevent a race where we don't set the
882 * assoc bit quickly enough before it sends the first frame
883 */
884 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 885 ieee80211_is_data_present(hdr->frame_control)) {
886 u16 ethertype;
887 u8 *payload;
888
889 payload = rx->skb->data +
890 ieee80211_hdrlen(hdr->frame_control);
891 ethertype = (payload[6] << 8) | payload[7];
892 if (cpu_to_be16(ethertype) ==
893 rx->sdata->control_port_protocol)
894 return RX_CONTINUE;
895 }
21fc7560
JB		 896
897 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
898 cfg80211_rx_spurious_frame(rx->sdata->dev,
899 hdr->addr2,
900 GFP_ATOMIC))
901 return RX_DROP_UNUSABLE;
902
e4c26add 903 return RX_DROP_MONITOR;
2a33bee2 904 }
571ecf67 905
9ae54c84 906 return RX_CONTINUE;
570bd537
JB		 907}
908
909
49461622 910static ieee80211_rx_result debug_noinline
5cf121c3 911ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 912{
eb9fb5b8
JB		 913 struct sk_buff *skb = rx->skb;
914 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
915 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 916 int keyidx;
917 int hdrlen;
e4c26add 918 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 919 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 920 int mmie_keyidx = -1;
761ab470 921 __le16 fc;
570bd537 922
3017b80b
JB		 923 /*
924 * Key selection 101
925 *
3cfcf6ac 926 * There are four types of keys:
3017b80b 927 * - GTK (group keys)
3cfcf6ac 928 * - IGTK (group keys for management frames)
3017b80b
JB		 929 * - PTK (pairwise keys)
930 * - STK (station-to-station pairwise keys)
931 *
932 * When selecting a key, we have to distinguish between multicast
933 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 934 * use PTKs and STKs while the former always use GTKs and IGTKs.
935 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
936 * unicast frames can also use key indices like GTKs. Hence, if we
937 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 938 *
8dc06a1c
JB		 939 * Note that in a regular BSS, multicast frames are sent by the
940 * AP only, associated stations unicast the frame to the AP first
941 * which then multicasts it on their behalf.
942 *
3017b80b
JB		 943 * There is also a slight problem in IBSS mode: GTKs are negotiated
944 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 945 * The spec seems to expect that one negotiates the same key with
946 * every station but there's no such requirement; VLANs could be
947 * possible.
3017b80b
JB		 948 */
949
3017b80b 950 /*
1990af8d 951 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 952 * addressed to us nor a multicast frame.
953 */
554891e6 954 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 955 return RX_CONTINUE;
3017b80b 956
2569a826
JB		 957 /* start without a key */
958 rx->key = NULL;
959
d4e46a3d 960 if (rx->sta)
e31b8213 961 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 962
761ab470
JB		 963 fc = hdr->frame_control;
964
965 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 966 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
967
e31b8213
JB		 968 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
969 rx->key = sta_ptk;
dc1580dd
JB		 970 if ((status->flag & RX_FLAG_DECRYPTED) &&
971 (status->flag & RX_FLAG_IV_STRIPPED))
972 return RX_CONTINUE;
0c7c10c7 973 /* Skip decryption if the frame is not protected. */
761ab470 974 if (!ieee80211_has_protected(fc))
0c7c10c7 975 return RX_CONTINUE;
3cfcf6ac
JM		 976 } else if (mmie_keyidx >= 0) {
977 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 978 if ((status->flag & RX_FLAG_DECRYPTED) &&
979 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 980 return RX_CONTINUE;
981
982 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
983 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
984 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 985 if (rx->sta)
986 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
987 if (!rx->key)
988 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 989 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 990 /*
991 * The frame was not protected, so skip decryption. However, we
992 * need to set rx->key if there is a key that could have been
993 * used so that the frame may be dropped if encryption would
994 * have been expected.
995 */
996 struct ieee80211_key *key = NULL;
897bed8b
JB		 997 struct ieee80211_sub_if_data *sdata = rx->sdata;
998 int i;
999
761ab470 1000 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1001 is_multicast_ether_addr(hdr->addr1) &&
1002 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1003 rx->key = key;
897bed8b
JB		 1004 else {
1005 if (rx->sta) {
1006 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1007 key = rcu_dereference(rx->sta->gtk[i]);
1008 if (key)
1009 break;
1010 }
1011 }
1012 if (!key) {
1013 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1014 key = rcu_dereference(sdata->keys[i]);
1015 if (key)
1016 break;
1017 }
1018 }
1019 if (key)
1020 rx->key = key;
1021 }
0c7c10c7 1022 return RX_CONTINUE;
571ecf67 1023 } else {
39184b15 1024 u8 keyid;
3017b80b
JB		 1025 /*
1026 * The device doesn't give us the IV so we won't be
1027 * able to look up the key. That's ok though, we
1028 * don't need to decrypt the frame, we just won't
1029 * be able to keep statistics accurate.
1030 * Except for key threshold notifications, should
1031 * we somehow allow the driver to tell us which key
1032 * the hardware used if this flag is set?
1033 */
eb9fb5b8
JB		 1034 if ((status->flag & RX_FLAG_DECRYPTED) &&
1035 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1036 return RX_CONTINUE;
3017b80b 1037
761ab470 1038 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1039
1040 if (rx->skb->len < 8 + hdrlen)
e4c26add 1041 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1042
1043 /*
1044 * no need to call ieee80211_wep_get_keyidx,
1045 * it verifies a bunch of things we've done already
1046 */
39184b15
ZY		 1047 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1048 keyidx = keyid >> 6;
3017b80b 1049
e31b8213
JB		 1050 /* check per-station GTK first, if multicast packet */
1051 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1052 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1053
e31b8213
JB		 1054 /* if not found, try default key */
1055 if (!rx->key) {
1056 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1057
1058 /*
1059 * RSNA-protected unicast frames should always be
1060 * sent with pairwise or station-to-station keys,
1061 * but for WEP we allow using a key index as well.
1062 */
1063 if (rx->key &&
1064 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1065 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1066 !is_multicast_ether_addr(hdr->addr1))
1067 rx->key = NULL;
1068 }
571ecf67
JB		 1069 }
1070
3017b80b 1071 if (rx->key) {
95acac61
JB		 1072 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1073 return RX_DROP_MONITOR;
1074
571ecf67 1075 rx->key->tx_rx_count++;
011bfcc4 1076 /* TODO: add threshold stuff again */
1990af8d 1077 } else {
e4c26add 1078 return RX_DROP_MONITOR;
70f08765
JB		 1079 }
1080
97359d12
JB		 1081 switch (rx->key->conf.cipher) {
1082 case WLAN_CIPHER_SUITE_WEP40:
1083 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1084 result = ieee80211_crypto_wep_decrypt(rx);
1085 break;
97359d12 1086 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1087 result = ieee80211_crypto_tkip_decrypt(rx);
1088 break;
97359d12 1089 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1090 result = ieee80211_crypto_ccmp_decrypt(rx);
1091 break;
97359d12 1092 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1093 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1094 break;
3ffc2a90
JB		 1095 default:
1096 /*
1097 * We can reach here only with HW-only algorithms
1098 * but why didn't it decrypt the frame?!
1099 */
1100 return RX_DROP_UNUSABLE;
70f08765
JB		 1101 }
1102
a8286911
JB		 1103 /* the hdr variable is invalid after the decrypt handlers */
1104
e2f036da 1105 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1106 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1107
1108 return result;
70f08765
JB		 1109}
1110
572e0012
KV		 1111static ieee80211_rx_result debug_noinline
1112ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1113{
1114 struct ieee80211_local *local;
1115 struct ieee80211_hdr *hdr;
1116 struct sk_buff *skb;
1117
1118 local = rx->local;
1119 skb = rx->skb;
1120 hdr = (struct ieee80211_hdr *) skb->data;
1121
1122 if (!local->pspolling)
1123 return RX_CONTINUE;
1124
1125 if (!ieee80211_has_fromds(hdr->frame_control))
1126 /* this is not from AP */
1127 return RX_CONTINUE;
1128
1129 if (!ieee80211_is_data(hdr->frame_control))
1130 return RX_CONTINUE;
1131
1132 if (!ieee80211_has_moredata(hdr->frame_control)) {
1133 /* AP has no more frames buffered for us */
1134 local->pspolling = false;
1135 return RX_CONTINUE;
1136 }
1137
1138 /* more data bit is set, let's request a new frame from the AP */
1139 ieee80211_send_pspoll(local, rx->sdata);
1140
1141 return RX_CONTINUE;
1142}
1143
133b8226 1144static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1145{
133b8226 1146 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1147 struct ieee80211_local *local = sdata->local;
0795af57 1148
3e122be0 1149 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1150 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1151 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1152 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1153 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1154 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1155}
1156
ff9458d3 1157static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1158{
bdcbd8e0
JB		 1159 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1160 sta->sta.addr, sta->sta.aid);
004c872e 1161
c2c98fde 1162 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1163 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1164 sta->sta.addr, sta->sta.aid);
af818581
JB		 1165 return;
1166 }
1167
1168 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1169}
1170
d057e5a3
AN		 1171int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1172{
1173 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1174 bool in_ps;
1175
1176 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1177
1178 /* Don't let the same PS state be set twice */
c2c98fde 1179 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1180 if ((start && in_ps) || (!start && !in_ps))
1181 return -EINVAL;
1182
1183 if (start)
1184 ap_sta_ps_start(sta_inf);
1185 else
1186 ap_sta_ps_end(sta_inf);
1187
1188 return 0;
1189}
1190EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1191
47086fc5
JB		 1192static ieee80211_rx_result debug_noinline
1193ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1194{
1195 struct ieee80211_sub_if_data *sdata = rx->sdata;
1196 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1197 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1198 int tid, ac;
1199
1200 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1201 return RX_CONTINUE;
1202
1203 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1204 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1205 return RX_CONTINUE;
1206
1207 /*
1208 * The device handles station powersave, so don't do anything about
1209 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1210 * it to mac80211 since they're handled.)
1211 */
1212 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1213 return RX_CONTINUE;
1214
1215 /*
1216 * Don't do anything if the station isn't already asleep. In
1217 * the uAPSD case, the station will probably be marked asleep,
1218 * in the PS-Poll case the station must be confused ...
1219 */
c2c98fde 1220 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1221 return RX_CONTINUE;
1222
1223 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1224 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1225 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1226 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1227 else
c2c98fde 1228 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1229 }
47086fc5
JB		 1230
1231 /* Free PS Poll skb here instead of returning RX_DROP that would
1232 * count as an dropped frame. */
1233 dev_kfree_skb(rx->skb);
1234
1235 return RX_QUEUED;
1236 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1237 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1238 ieee80211_has_pm(hdr->frame_control) &&
1239 (ieee80211_is_data_qos(hdr->frame_control) ||
1240 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1241 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1242 ac = ieee802_1d_to_ac[tid & 7];
1243
1244 /*
1245 * If this AC is not trigger-enabled do nothing.
1246 *
1247 * NB: This could/should check a separate bitmap of trigger-
1248 * enabled queues, but for now we only implement uAPSD w/o
1249 * TSPEC changes to the ACs, so they're always the same.
1250 */
1251 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1252 return RX_CONTINUE;
1253
1254 /* if we are in a service period, do nothing */
c2c98fde 1255 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1256 return RX_CONTINUE;
1257
c2c98fde 1258 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1259 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1260 else
c2c98fde 1261 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1262 }
1263
1264 return RX_CONTINUE;
1265}
1266
49461622 1267static ieee80211_rx_result debug_noinline
5cf121c3 1268ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1269{
1270 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1271 struct sk_buff *skb = rx->skb;
1272 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1274
1275 if (!sta)
9ae54c84 1276 return RX_CONTINUE;
571ecf67 1277
b291ba11
JB		 1278 /*
1279 * Update last_rx only for IBSS packets which are for the current
1280 * BSSID to avoid keeping the current IBSS network alive in cases
1281 * where other STAs start using different BSSID.
1282 */
05c914fe 1283 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1284 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1285 NL80211_IFTYPE_ADHOC);
b203ca39 1286 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
571ecf67 1287 sta->last_rx = jiffies;
3af6334c
FF		 1288 if (ieee80211_is_data(hdr->frame_control)) {
1289 sta->last_rx_rate_idx = status->rate_idx;
1290 sta->last_rx_rate_flag = status->flag;
1291 }
1292 }
b291ba11
JB		 1293 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1294 /*
33b64eb2
LCC		 1295 * Mesh beacons will update last_rx when if they are found to
1296 * match the current local configuration when processed.
571ecf67 1297 */
b291ba11 1298 sta->last_rx = jiffies;
3af6334c
FF		 1299 if (ieee80211_is_data(hdr->frame_control)) {
1300 sta->last_rx_rate_idx = status->rate_idx;
1301 sta->last_rx_rate_flag = status->flag;
1302 }
571ecf67
JB		 1303 }
1304
554891e6 1305 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1306 return RX_CONTINUE;
571ecf67 1307
3cf335d5
KV		 1308 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1309 ieee80211_sta_rx_notify(rx->sdata, hdr);
1310
571ecf67
JB		 1311 sta->rx_fragments++;
1312 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1313 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1314 sta->last_signal = status->signal;
1315 ewma_add(&sta->avg_signal, -status->signal);
1316 }
571ecf67 1317
72eaa43a
JB		 1318 /*
1319 * Change STA power saving mode only at the end of a frame
1320 * exchange sequence.
1321 */
d057e5a3
AN		 1322 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1323 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1324 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1325 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1326 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1327 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1328 /*
1329 * Ignore doze->wake transitions that are
1330 * indicated by non-data frames, the standard
1331 * is unclear here, but for example going to
1332 * PS mode and then scanning would cause a
1333 * doze->wake transition for the probe request,
1334 * and that is clearly undesirable.
1335 */
1336 if (ieee80211_is_data(hdr->frame_control) &&
1337 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1338 ap_sta_ps_end(sta);
72eaa43a
JB		 1339 } else {
1340 if (ieee80211_has_pm(hdr->frame_control))
1341 ap_sta_ps_start(sta);
1342 }
571ecf67
JB		 1343 }
1344
22403def
JB		 1345 /*
1346 * Drop (qos-)data::nullfunc frames silently, since they
1347 * are used only to control station power saving mode.
1348 */
1349 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1350 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1351 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1352
1353 /*
1354 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1355 * that was not moved to a 4-addr STA vlan yet send
1356 * the event to userspace and for older hostapd drop
1357 * the frame to the monitor interface.
d524215f
FF		 1358 */
1359 if (ieee80211_has_a4(hdr->frame_control) &&
1360 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1361 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1362 !rx->sdata->u.vlan.sta))) {
1363 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1364 cfg80211_rx_unexpected_4addr_frame(
1365 rx->sdata->dev, sta->sta.addr,
1366 GFP_ATOMIC);
d524215f 1367 return RX_DROP_MONITOR;
e7f4a940 1368 }
22403def
JB		 1369 /*
1370 * Update counter and free packet here to avoid
1371 * counting this as a dropped packed.
1372 */
571ecf67
JB		 1373 sta->rx_packets++;
1374 dev_kfree_skb(rx->skb);
9ae54c84 1375 return RX_QUEUED;
571ecf67
JB		 1376 }
1377
9ae54c84 1378 return RX_CONTINUE;
571ecf67
JB		 1379} /* ieee80211_rx_h_sta_process */
1380
571ecf67
JB		 1381static inline struct ieee80211_fragment_entry *
1382ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1383 unsigned int frag, unsigned int seq, int rx_queue,
1384 struct sk_buff **skb)
1385{
1386 struct ieee80211_fragment_entry *entry;
571ecf67 1387
571ecf67
JB		 1388 entry = &sdata->fragments[sdata->fragment_next++];
1389 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1390 sdata->fragment_next = 0;
1391
bdcbd8e0 1392 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1393 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1394
1395 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1396 *skb = NULL;
1397 entry->first_frag_time = jiffies;
1398 entry->seq = seq;
1399 entry->rx_queue = rx_queue;
1400 entry->last_frag = frag;
1401 entry->ccmp = 0;
1402 entry->extra_len = 0;
1403
1404 return entry;
1405}
1406
1407static inline struct ieee80211_fragment_entry *
1408ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1409 unsigned int frag, unsigned int seq,
571ecf67
JB		 1410 int rx_queue, struct ieee80211_hdr *hdr)
1411{
1412 struct ieee80211_fragment_entry *entry;
1413 int i, idx;
1414
1415 idx = sdata->fragment_next;
1416 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1417 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1418
1419 idx--;
1420 if (idx < 0)
1421 idx = IEEE80211_FRAGMENT_MAX - 1;
1422
1423 entry = &sdata->fragments[idx];
1424 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1425 entry->rx_queue != rx_queue ||
1426 entry->last_frag + 1 != frag)
1427 continue;
1428
b73d70ad 1429 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1430
b73d70ad
HH		 1431 /*
1432 * Check ftype and addresses are equal, else check next fragment
1433 */
1434 if (((hdr->frame_control ^ f_hdr->frame_control) &
1435 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1436 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1437 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1438 continue;
1439
ab46623e 1440 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1441 __skb_queue_purge(&entry->skb_list);
1442 continue;
1443 }
1444 return entry;
1445 }
1446
1447 return NULL;
1448}
1449
49461622 1450static ieee80211_rx_result debug_noinline
5cf121c3 1451ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1452{
1453 struct ieee80211_hdr *hdr;
1454 u16 sc;
358c8d9d 1455 __le16 fc;
571ecf67
JB		 1456 unsigned int frag, seq;
1457 struct ieee80211_fragment_entry *entry;
1458 struct sk_buff *skb;
554891e6 1459 struct ieee80211_rx_status *status;
571ecf67 1460
b73d70ad 1461 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1462 fc = hdr->frame_control;
571ecf67
JB		 1463 sc = le16_to_cpu(hdr->seq_ctrl);
1464 frag = sc & IEEE80211_SCTL_FRAG;
1465
358c8d9d 1466 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1467 (rx->skb)->len < 24 ||
1468 is_multicast_ether_addr(hdr->addr1))) {
1469 /* not fragmented */
1470 goto out;
1471 }
1472 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1473
e3cf8b3f
ZY		 1474 if (skb_linearize(rx->skb))
1475 return RX_DROP_UNUSABLE;
1476
058897a4
AK		 1477 /*
1478 * skb_linearize() might change the skb->data and
1479 * previously cached variables (in this case, hdr) need to
1480 * be refreshed with the new data.
1481 */
1482 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1483 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1484
1485 if (frag == 0) {
1486 /* This is the first fragment of a new frame. */
1487 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1488 rx->seqno_idx, &(rx->skb));
97359d12 1489 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1490 ieee80211_has_protected(fc)) {
9e26297a 1491 int queue = rx->security_idx;
571ecf67
JB		 1492 /* Store CCMP PN so that we can verify that the next
1493 * fragment has a sequential PN value. */
1494 entry->ccmp = 1;
1495 memcpy(entry->last_pn,
9190252c 1496 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1497 CCMP_PN_LEN);
1498 }
9ae54c84 1499 return RX_QUEUED;
571ecf67
JB		 1500 }
1501
1502 /* This is a fragment for a frame that should already be pending in
1503 * fragment cache. Add this fragment to the end of the pending entry.
1504 */
9e26297a
JB		 1505 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1506 rx->seqno_idx, hdr);
571ecf67
JB		 1507 if (!entry) {
1508 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1509 return RX_DROP_MONITOR;
571ecf67
JB		 1510 }
1511
1512 /* Verify that MPDUs within one MSDU have sequential PN values.
1513 * (IEEE 802.11i, 8.3.3.4.5) */
1514 if (entry->ccmp) {
1515 int i;
1516 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1517 int queue;
97359d12 1518 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1519 return RX_DROP_UNUSABLE;
571ecf67
JB		 1520 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1521 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1522 pn[i]++;
1523 if (pn[i])
1524 break;
1525 }
9e26297a 1526 queue = rx->security_idx;
9190252c 1527 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1528 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1529 return RX_DROP_UNUSABLE;
571ecf67
JB		 1530 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1531 }
1532
358c8d9d 1533 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1534 __skb_queue_tail(&entry->skb_list, rx->skb);
1535 entry->last_frag = frag;
1536 entry->extra_len += rx->skb->len;
358c8d9d 1537 if (ieee80211_has_morefrags(fc)) {
571ecf67 1538 rx->skb = NULL;
9ae54c84 1539 return RX_QUEUED;
571ecf67
JB		 1540 }
1541
1542 rx->skb = __skb_dequeue(&entry->skb_list);
1543 if (skb_tailroom(rx->skb) < entry->extra_len) {
1544 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1545 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1546 GFP_ATOMIC))) {
1547 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1548 __skb_queue_purge(&entry->skb_list);
e4c26add 1549 return RX_DROP_UNUSABLE;
571ecf67
JB		 1550 }
1551 }
1552 while ((skb = __skb_dequeue(&entry->skb_list))) {
1553 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1554 dev_kfree_skb(skb);
1555 }
1556
1557 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1558 status = IEEE80211_SKB_RXCB(rx->skb);
1559 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1560
1561 out:
1562 if (rx->sta)
1563 rx->sta->rx_packets++;
1564 if (is_multicast_ether_addr(hdr->addr1))
1565 rx->local->dot11MulticastReceivedFrameCount++;
1566 else
1567 ieee80211_led_rx(rx->local);
9ae54c84 1568 return RX_CONTINUE;
571ecf67
JB		 1569}
1570
76ee65bf 1571static int
5cf121c3 1572ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1573{
07346f81 1574 if (unlikely(!rx->sta ||
c2c98fde 1575 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1576 return -EACCES;
571ecf67 1577
76ee65bf 1578 return 0;
571ecf67
JB		 1579}
1580
76ee65bf 1581static int
358c8d9d 1582ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1583{
eb9fb5b8
JB		 1584 struct sk_buff *skb = rx->skb;
1585 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1586
3017b80b 1587 /*
7848ba7d
JB		 1588 * Pass through unencrypted frames if the hardware has
1589 * decrypted them already.
3017b80b 1590 */
eb9fb5b8 1591 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1592 return 0;
571ecf67
JB		 1593
1594 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1595 if (unlikely(!ieee80211_has_protected(fc) &&
1596 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1597 ieee80211_is_data(fc) &&
b3fc9c6c 1598 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1599 return -EACCES;
bef5d1c7
JB		 1600
1601 return 0;
1602}
1603
1604static int
1605ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1606{
1607 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1608 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1609 __le16 fc = hdr->frame_control;
bef5d1c7 1610
e3efca0a
JM		 1611 /*
1612 * Pass through unencrypted frames if the hardware has
1613 * decrypted them already.
1614 */
1615 if (status->flag & RX_FLAG_DECRYPTED)
1616 return 0;
bef5d1c7 1617
c2c98fde 1618 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1619 if (unlikely(!ieee80211_has_protected(fc) &&
1620 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1621 rx->key)) {
1622 if (ieee80211_is_deauth(fc))
1623 cfg80211_send_unprot_deauth(rx->sdata->dev,
1624 rx->skb->data,
1625 rx->skb->len);
1626 else if (ieee80211_is_disassoc(fc))
1627 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1628 rx->skb->data,
1629 rx->skb->len);
f2ca3ea4 1630 return -EACCES;
cf4e594e 1631 }
f2ca3ea4 1632 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1633 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1634 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1635 if (ieee80211_is_deauth(fc))
1636 cfg80211_send_unprot_deauth(rx->sdata->dev,
1637 rx->skb->data,
1638 rx->skb->len);
1639 else if (ieee80211_is_disassoc(fc))
1640 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1641 rx->skb->data,
1642 rx->skb->len);
f2ca3ea4 1643 return -EACCES;
cf4e594e 1644 }
f2ca3ea4
JM		 1645 /*
1646 * When using MFP, Action frames are not allowed prior to
1647 * having configured keys.
1648 */
1649 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1650 ieee80211_is_robust_mgmt_frame(
1651 (struct ieee80211_hdr *) rx->skb->data)))
1652 return -EACCES;
1653 }
b3fc9c6c 1654
76ee65bf 1655 return 0;
571ecf67
JB		 1656}
1657
76ee65bf 1658static int
4114fa21 1659__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1660{
eb9fb5b8 1661 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1662 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1663 bool check_port_control = false;
1664 struct ethhdr *ehdr;
1665 int ret;
f14543ee 1666
4114fa21 1667 *port_control = false;
9bc383de
JB		 1668 if (ieee80211_has_a4(hdr->frame_control) &&
1669 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1670 return -1;
9bc383de 1671
fbb327c5
FF		 1672 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1673 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1674
1675 if (!sdata->u.mgd.use_4addr)
1676 return -1;
1677 else
1678 check_port_control = true;
1679 }
1680
9bc383de 1681 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1682 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1683 return -1;
571ecf67 1684
fbb327c5 1685 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1686 if (ret < 0)
fbb327c5
FF		 1687 return ret;
1688
1689 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1690 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1691 *port_control = true;
1692 else if (check_port_control)
fbb327c5
FF		 1693 return -1;
1694
1695 return 0;
76ee65bf 1696}
571ecf67 1697
ce3edf6d
JB		 1698/*
1699 * requires that rx->skb is a frame with ethernet header
1700 */
358c8d9d 1701static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1702{
c97c23e3 1703 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1704 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1705 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1706
1707 /*
1708 * Allow EAPOL frames to us/the PAE group address regardless
1709 * of whether the frame was encrypted or not.
1710 */
a621fa4d 1711 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1712 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1713 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1714 return true;
1715
1716 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1717 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1718 return false;
1719
1720 return true;
1721}
1722
1723/*
1724 * requires that rx->skb is a frame with ethernet header
1725 */
76ee65bf 1726static void
5cf121c3 1727ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1728{
eb9fb5b8
JB		 1729 struct ieee80211_sub_if_data *sdata = rx->sdata;
1730 struct net_device *dev = sdata->dev;
76ee65bf 1731 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1732 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1733 struct sta_info *dsta;
554891e6 1734 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1735
76ee65bf
RR		 1736 skb = rx->skb;
1737 xmit_skb = NULL;
571ecf67 1738
05c914fe
JB		 1739 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1740 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1741 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1742 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1743 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1744 if (is_multicast_ether_addr(ehdr->h_dest)) {
1745 /*
1746 * send multicast frames both to higher layers in
1747 * local net stack and back to the wireless medium
1748 */
76ee65bf 1749 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1750 if (!xmit_skb)
bdcbd8e0 1751 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1752 dev->name);
571ecf67 1753 } else {
abe60632
JB		 1754 dsta = sta_info_get(sdata, skb->data);
1755 if (dsta) {
ce3edf6d
JB		 1756 /*
1757 * The destination station is associated to
1758 * this AP (in this VLAN), so send the frame
1759 * directly to it and do not pass it to local
1760 * net stack.
571ecf67 1761 */
76ee65bf 1762 xmit_skb = skb;
571ecf67
JB		 1763 skb = NULL;
1764 }
571ecf67
JB		 1765 }
1766 }
1767
1768 if (skb) {
d1c3a37c
JB		 1769 int align __maybe_unused;
1770
59d9cb07 1771#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1772 /*
1773 * 'align' will only take the values 0 or 2 here
1774 * since all frames are required to be aligned
1775 * to 2-byte boundaries when being passed to
1776 * mac80211. That also explains the __skb_push()
1777 * below.
1778 */
dacb6f1d 1779 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1780 if (align) {
1781 if (WARN_ON(skb_headroom(skb) < 3)) {
1782 dev_kfree_skb(skb);
1783 skb = NULL;
1784 } else {
1785 u8 *data = skb->data;
8ce0b589
ZY		 1786 size_t len = skb_headlen(skb);
1787 skb->data -= align;
1788 memmove(skb->data, data, len);
1789 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1790 }
1791 }
1792#endif
1793
1794 if (skb) {
1795 /* deliver to local stack */
1796 skb->protocol = eth_type_trans(skb, dev);
1797 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1798 netif_receive_skb(skb);
d1c3a37c 1799 }
571ecf67
JB		 1800 }
1801
76ee65bf 1802 if (xmit_skb) {
aef6c928
HS		 1803 /*
1804 * Send to wireless media and increase priority by 256 to
1805 * keep the received priority instead of reclassifying
1806 * the frame (see cfg80211_classify8021d).
1807 */
1808 xmit_skb->priority += 256;
f831e909 1809 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1810 skb_reset_network_header(xmit_skb);
1811 skb_reset_mac_header(xmit_skb);
76ee65bf 1812 dev_queue_xmit(xmit_skb);
571ecf67 1813 }
76ee65bf
RR		 1814}
1815
49461622 1816static ieee80211_rx_result debug_noinline
5cf121c3 1817ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1818{
eb9fb5b8 1819 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1820 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1821 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1822 __le16 fc = hdr->frame_control;
eaf85ca7 1823 struct sk_buff_head frame_list;
554891e6 1824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1825
358c8d9d 1826 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1827 return RX_CONTINUE;
fd4c7f2f 1828
358c8d9d 1829 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1830 return RX_DROP_MONITOR;
fd4c7f2f 1831
554891e6 1832 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1833 return RX_CONTINUE;
fd4c7f2f 1834
eaf85ca7
ZY		 1835 if (ieee80211_has_a4(hdr->frame_control) &&
1836 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1837 !rx->sdata->u.vlan.sta)
e4c26add 1838 return RX_DROP_UNUSABLE;
fd4c7f2f 1839
eaf85ca7
ZY		 1840 if (is_multicast_ether_addr(hdr->addr1) &&
1841 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1842 rx->sdata->u.vlan.sta) ||
1843 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1844 rx->sdata->u.mgd.use_4addr)))
e4c26add 1845 return RX_DROP_UNUSABLE;
fd4c7f2f 1846
eaf85ca7
ZY		 1847 skb->dev = dev;
1848 __skb_queue_head_init(&frame_list);
fd4c7f2f 1849
e3cf8b3f
ZY		 1850 if (skb_linearize(skb))
1851 return RX_DROP_UNUSABLE;
1852
eaf85ca7
ZY		 1853 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1854 rx->sdata->vif.type,
8b3becad 1855 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1856
eaf85ca7
ZY		 1857 while (!skb_queue_empty(&frame_list)) {
1858 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1859
358c8d9d 1860 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1861 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1862 continue;
1863 }
eaf85ca7
ZY		 1864 dev->stats.rx_packets++;
1865 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1866
1867 ieee80211_deliver_skb(rx);
1868 }
1869
9ae54c84 1870 return RX_QUEUED;
fd4c7f2f
RR		 1871}
1872
bf94e17b 1873#ifdef CONFIG_MAC80211_MESH
b0dee578 1874static ieee80211_rx_result
e32f85f7
LCC		 1875ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1876{
30789eb6
TP		 1877 struct ieee80211_hdr *fwd_hdr, *hdr;
1878 struct ieee80211_tx_info *info;
e32f85f7 1879 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1880 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1881 struct ieee80211_local *local = rx->local;
eb9fb5b8 1882 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1883 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1884 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1885 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1886 u16 q, hdrlen;
e32f85f7
LCC		 1887
1888 hdr = (struct ieee80211_hdr *) skb->data;
1889 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1890 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1891
2157fdd6
TP		 1892 /* frame is in RMC, don't forward */
1893 if (ieee80211_is_data(hdr->frame_control) &&
1894 is_multicast_ether_addr(hdr->addr1) &&
1895 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1896 return RX_DROP_MONITOR;
1897
e32f85f7
LCC		 1898 if (!ieee80211_is_data(hdr->frame_control))
1899 return RX_CONTINUE;
1900
1901 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1902 return RX_DROP_MONITOR;
1903
43b7b314 1904 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1905 struct mesh_path *mppath;
43b7b314
JC		 1906 char *proxied_addr;
1907 char *mpp_addr;
1908
1909 if (is_multicast_ether_addr(hdr->addr1)) {
1910 mpp_addr = hdr->addr3;
1911 proxied_addr = mesh_hdr->eaddr1;
1912 } else {
1913 mpp_addr = hdr->addr4;
1914 proxied_addr = mesh_hdr->eaddr2;
1915 }
79617dee 1916
79617dee 1917 rcu_read_lock();
43b7b314 1918 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1919 if (!mppath) {
43b7b314 1920 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1921 } else {
1922 spin_lock_bh(&mppath->state_lock);
b203ca39 1923 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 1924 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1925 spin_unlock_bh(&mppath->state_lock);
1926 }
1927 rcu_read_unlock();
1928 }
1929
3c5772a5
JC		 1930 /* Frame has reached destination. Don't forward */
1931 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 1932 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 1933 return RX_CONTINUE;
1934
00e96dec 1935 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 1936 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1937 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1938 return RX_DROP_MONITOR;
1939 }
1940 skb_set_queue_mapping(skb, q);
e32f85f7 1941
30789eb6
TP		 1942 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1943 goto out;
c8a61a7d 1944
30789eb6
TP		 1945 if (!--mesh_hdr->ttl) {
1946 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1947 return RX_DROP_MONITOR;
1948 }
1949
d665508b
CYY		 1950 if (!ifmsh->mshcfg.dot11MeshForwarding)
1951 goto out;
1952
30789eb6
TP		 1953 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1954 if (!fwd_skb) {
bdcbd8e0 1955 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 1956 sdata->name);
30789eb6
TP		 1957 goto out;
1958 }
1959
1960 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1961 info = IEEE80211_SKB_CB(fwd_skb);
1962 memset(info, 0, sizeof(*info));
1963 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1964 info->control.vif = &rx->sdata->vif;
1965 info->control.jiffies = jiffies;
1966 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1967 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1968 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1969 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1970 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1971 } else {
1972 /* unable to resolve next hop */
1973 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1974 0, reason, fwd_hdr->addr2, sdata);
1975 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1976 kfree_skb(fwd_skb);
30789eb6 1977 return RX_DROP_MONITOR;
e32f85f7
LCC		 1978 }
1979
30789eb6
TP		 1980 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1981 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1982 out:
3c5772a5 1983 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1984 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1985 return RX_CONTINUE;
1986 else
1987 return RX_DROP_MONITOR;
1988}
bf94e17b 1989#endif
e32f85f7 1990
49461622 1991static ieee80211_rx_result debug_noinline
5cf121c3 1992ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1993{
eb9fb5b8 1994 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1995 struct ieee80211_local *local = rx->local;
eb9fb5b8 1996 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1997 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1998 __le16 fc = hdr->frame_control;
4114fa21 1999 bool port_control;
ce3edf6d 2000 int err;
76ee65bf 2001
358c8d9d 2002 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2003 return RX_CONTINUE;
76ee65bf 2004
358c8d9d 2005 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2006 return RX_DROP_MONITOR;
76ee65bf 2007
f14543ee 2008 /*
e7f4a940
JB		 2009 * Send unexpected-4addr-frame event to hostapd. For older versions,
2010 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2011 */
2012 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2013 sdata->vif.type == NL80211_IFTYPE_AP) {
2014 if (rx->sta &&
2015 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2016 cfg80211_rx_unexpected_4addr_frame(
2017 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2018 return RX_DROP_MONITOR;
e7f4a940 2019 }
f14543ee 2020
4114fa21 2021 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2022 if (unlikely(err))
e4c26add 2023 return RX_DROP_UNUSABLE;
76ee65bf 2024
358c8d9d 2025 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2026 return RX_DROP_MONITOR;
ce3edf6d 2027
4114fa21
FF		 2028 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2029 unlikely(port_control) && sdata->bss) {
2030 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2031 u.ap);
2032 dev = sdata->dev;
2033 rx->sdata = sdata;
2034 }
2035
76ee65bf
RR		 2036 rx->skb->dev = dev;
2037
2038 dev->stats.rx_packets++;
2039 dev->stats.rx_bytes += rx->skb->len;
2040
08ca944e 2041 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2042 !is_multicast_ether_addr(
2043 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2044 (!local->scanning &&
2045 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2046 mod_timer(&local->dynamic_ps_timer, jiffies +
2047 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2048 }
2049
76ee65bf 2050 ieee80211_deliver_skb(rx);
571ecf67 2051
9ae54c84 2052 return RX_QUEUED;
571ecf67
JB		 2053}
2054
49461622 2055static ieee80211_rx_result debug_noinline
24a8fdad 2056ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2057{
71364716 2058 struct sk_buff *skb = rx->skb;
a7767f95 2059 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2060 struct tid_ampdu_rx *tid_agg_rx;
2061 u16 start_seq_num;
2062 u16 tid;
2063
a7767f95 2064 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2065 return RX_CONTINUE;
71364716 2066
a7767f95 2067 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2068 struct {
2069 __le16 control, start_seq_num;
2070 } __packed bar_data;
2071
71364716 2072 if (!rx->sta)
a02ae758 2073 return RX_DROP_MONITOR;
8ae5977f
JB		 2074
2075 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2076 &bar_data, sizeof(bar_data)))
2077 return RX_DROP_MONITOR;
2078
8ae5977f 2079 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2080
2081 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2082 if (!tid_agg_rx)
a02ae758 2083 return RX_DROP_MONITOR;
71364716 2084
8ae5977f 2085 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2086
2087 /* reset session timer */
20ad19d0
JB		 2088 if (tid_agg_rx->timeout)
2089 mod_timer(&tid_agg_rx->session_timer,
2090 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2091
dd318575 2092 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2093 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2094 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2095 start_seq_num);
dd318575
JB		 2096 spin_unlock(&tid_agg_rx->reorder_lock);
2097
a02ae758
JB		 2098 kfree_skb(skb);
2099 return RX_QUEUED;
71364716
RR		 2100 }
2101
08daecae
JB		 2102 /*
2103 * After this point, we only want management frames,
2104 * so we can drop all remaining control frames to
2105 * cooked monitor interfaces.
2106 */
2107 return RX_DROP_MONITOR;
71364716
RR		 2108}
2109
f4f727a6
JM		 2110static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2111 struct ieee80211_mgmt *mgmt,
2112 size_t len)
fea14732
JM		 2113{
2114 struct ieee80211_local *local = sdata->local;
2115 struct sk_buff *skb;
2116 struct ieee80211_mgmt *resp;
2117
b203ca39 2118 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2119 /* Not to own unicast address */
2120 return;
2121 }
2122
b203ca39
JP		 2123 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2124 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2125 /* Not from the current AP or not associated yet. */
fea14732
JM		 2126 return;
2127 }
2128
2129 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2130 /* Too short SA Query request frame */
2131 return;
2132 }
2133
2134 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2135 if (skb == NULL)
2136 return;
2137
2138 skb_reserve(skb, local->hw.extra_tx_headroom);
2139 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2140 memset(resp, 0, 24);
2141 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2142 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2143 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2144 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2145 IEEE80211_STYPE_ACTION);
2146 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2147 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2148 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2149 memcpy(resp->u.action.u.sa_query.trans_id,
2150 mgmt->u.action.u.sa_query.trans_id,
2151 WLAN_SA_QUERY_TR_ID_LEN);
2152
62ae67be 2153 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2154}
2155
2e161f78
JB		 2156static ieee80211_rx_result debug_noinline
2157ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2158{
2159 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2160 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2161
2162 /*
2163 * From here on, look only at management frames.
2164 * Data and control frames are already handled,
2165 * and unknown (reserved) frames are useless.
2166 */
2167 if (rx->skb->len < 24)
2168 return RX_DROP_MONITOR;
2169
2170 if (!ieee80211_is_mgmt(mgmt->frame_control))
2171 return RX_DROP_MONITOR;
2172
ee971924
JB		 2173 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2174 ieee80211_is_beacon(mgmt->frame_control) &&
2175 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2176 int sig = 0;
2177
2178 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2179 sig = status->signal;
2180
ee971924
JB		 2181 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2182 rx->skb->data, rx->skb->len,
804483e9 2183 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2184 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2185 }
2186
554891e6 2187 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2188 return RX_DROP_MONITOR;
2189
2190 if (ieee80211_drop_unencrypted_mgmt(rx))
2191 return RX_DROP_UNUSABLE;
2192
2193 return RX_CONTINUE;
2194}
2195
de1ede7a
JB		 2196static ieee80211_rx_result debug_noinline
2197ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2198{
2199 struct ieee80211_local *local = rx->local;
eb9fb5b8 2200 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2201 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2202 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2203 int len = rx->skb->len;
2204
2205 if (!ieee80211_is_action(mgmt->frame_control))
2206 return RX_CONTINUE;
2207
026331c4
JM		 2208 /* drop too small frames */
2209 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2210 return RX_DROP_UNUSABLE;
de1ede7a 2211
026331c4 2212 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2213 return RX_DROP_UNUSABLE;
de1ede7a 2214
554891e6 2215 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2216 return RX_DROP_UNUSABLE;
97ebe12a 2217
de1ede7a 2218 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2219 case WLAN_CATEGORY_HT:
2220 /* reject HT action frames from stations not supporting HT */
2221 if (!rx->sta->sta.ht_cap.ht_supported)
2222 goto invalid;
2223
2224 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2225 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2226 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2227 sdata->vif.type != NL80211_IFTYPE_AP &&
2228 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2229 break;
2230
2231 /* verify action & smps_control are present */
2232 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2233 goto invalid;
2234
2235 switch (mgmt->u.action.u.ht_smps.action) {
2236 case WLAN_HT_ACTION_SMPS: {
2237 struct ieee80211_supported_band *sband;
2238 u8 smps;
2239
2240 /* convert to HT capability */
2241 switch (mgmt->u.action.u.ht_smps.smps_control) {
2242 case WLAN_HT_SMPS_CONTROL_DISABLED:
2243 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2244 break;
2245 case WLAN_HT_SMPS_CONTROL_STATIC:
2246 smps = WLAN_HT_CAP_SM_PS_STATIC;
2247 break;
2248 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2249 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2250 break;
2251 default:
2252 goto invalid;
2253 }
2254 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2255
2256 /* if no change do nothing */
2257 if ((rx->sta->sta.ht_cap.cap &
2258 IEEE80211_HT_CAP_SM_PS) == smps)
2259 goto handled;
2260
2261 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2262 rx->sta->sta.ht_cap.cap |= smps;
2263
2264 sband = rx->local->hw.wiphy->bands[status->band];
2265
64f68e5d
JB		 2266 rate_control_rate_update(local, sband, rx->sta,
2267 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2268 goto handled;
2269 }
2270 default:
2271 goto invalid;
2272 }
2273
2274 break;
de1ede7a 2275 case WLAN_CATEGORY_BACK:
8abd3f9b 2276 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2277 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2278 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2279 sdata->vif.type != NL80211_IFTYPE_AP &&
2280 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2281 break;
8abd3f9b 2282
026331c4
JM		 2283 /* verify action_code is present */
2284 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2285 break;
2286
de1ede7a
JB		 2287 switch (mgmt->u.action.u.addba_req.action_code) {
2288 case WLAN_ACTION_ADDBA_REQ:
2289 if (len < (IEEE80211_MIN_ACTION_SIZE +
2290 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2291 goto invalid;
2292 break;
de1ede7a
JB		 2293 case WLAN_ACTION_ADDBA_RESP:
2294 if (len < (IEEE80211_MIN_ACTION_SIZE +
2295 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2296 goto invalid;
2297 break;
de1ede7a
JB		 2298 case WLAN_ACTION_DELBA:
2299 if (len < (IEEE80211_MIN_ACTION_SIZE +
2300 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2301 goto invalid;
2302 break;
2303 default:
2304 goto invalid;
de1ede7a 2305 }
bed7ee6e 2306
8b58ff83 2307 goto queue;
39192c0b 2308 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2309 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2310 break;
46900298
JB		 2311
2312 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2313 break;
46900298 2314
026331c4
JM		 2315 /* verify action_code is present */
2316 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2317 break;
2318
39192c0b
JB		 2319 switch (mgmt->u.action.u.measurement.action_code) {
2320 case WLAN_ACTION_SPCT_MSR_REQ:
2321 if (len < (IEEE80211_MIN_ACTION_SIZE +
2322 sizeof(mgmt->u.action.u.measurement)))
84040805 2323 break;
39192c0b 2324 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2325 goto handled;
c481ec97
S		 2326 case WLAN_ACTION_SPCT_CHL_SWITCH:
2327 if (len < (IEEE80211_MIN_ACTION_SIZE +
2328 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2329 break;
c481ec97 2330
cc32abd4 2331 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2332 break;
cc32abd4 2333
b203ca39 2334 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2335 break;
c481ec97 2336
8b58ff83 2337 goto queue;
39192c0b
JB		 2338 }
2339 break;
fea14732
JM		 2340 case WLAN_CATEGORY_SA_QUERY:
2341 if (len < (IEEE80211_MIN_ACTION_SIZE +
2342 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2343 break;
2344
fea14732
JM		 2345 switch (mgmt->u.action.u.sa_query.action) {
2346 case WLAN_ACTION_SA_QUERY_REQUEST:
2347 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2348 break;
fea14732 2349 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2350 goto handled;
fea14732
JM		 2351 }
2352 break;
8db09850
TP		 2353 case WLAN_CATEGORY_SELF_PROTECTED:
2354 switch (mgmt->u.action.u.self_prot.action_code) {
2355 case WLAN_SP_MESH_PEERING_OPEN:
2356 case WLAN_SP_MESH_PEERING_CLOSE:
2357 case WLAN_SP_MESH_PEERING_CONFIRM:
2358 if (!ieee80211_vif_is_mesh(&sdata->vif))
2359 goto invalid;
2360 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2361 /* userspace handles this frame */
2362 break;
2363 goto queue;
2364 case WLAN_SP_MGK_INFORM:
2365 case WLAN_SP_MGK_ACK:
2366 if (!ieee80211_vif_is_mesh(&sdata->vif))
2367 goto invalid;
2368 break;
2369 }
2370 break;
d3aaec8a 2371 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2372 if (!ieee80211_vif_is_mesh(&sdata->vif))
2373 break;
25d49e4d
TP		 2374 if (mesh_action_is_path_sel(mgmt) &&
2375 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2376 break;
2377 goto queue;
84040805 2378 }
026331c4 2379
2e161f78
JB		 2380 return RX_CONTINUE;
2381
bed7ee6e 2382 invalid:
554891e6 2383 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2384 /* will return in the next handlers */
2385 return RX_CONTINUE;
2386
2387 handled:
2388 if (rx->sta)
2389 rx->sta->rx_packets++;
2390 dev_kfree_skb(rx->skb);
2391 return RX_QUEUED;
2392
2393 queue:
2394 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2395 skb_queue_tail(&sdata->skb_queue, rx->skb);
2396 ieee80211_queue_work(&local->hw, &sdata->work);
2397 if (rx->sta)
2398 rx->sta->rx_packets++;
2399 return RX_QUEUED;
2400}
2401
2402static ieee80211_rx_result debug_noinline
2403ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2404{
554891e6 2405 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2406 int sig = 0;
2e161f78
JB		 2407
2408 /* skip known-bad action frames and return them in the next handler */
554891e6 2409 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2410 return RX_CONTINUE;
d7907448 2411
026331c4
JM		 2412 /*
2413 * Getting here means the kernel doesn't know how to handle
2414 * it, but maybe userspace does ... include returned frames
2415 * so userspace can register for those to know whether ones
2416 * it transmitted were processed or returned.
2417 */
026331c4 2418
804483e9
JB		 2419 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2420 sig = status->signal;
2421
71bbc994 2422 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2423 rx->skb->data, rx->skb->len,
2424 GFP_ATOMIC)) {
2425 if (rx->sta)
2426 rx->sta->rx_packets++;
2427 dev_kfree_skb(rx->skb);
2428 return RX_QUEUED;
2429 }
2430
2431
2432 return RX_CONTINUE;
2433}
2434
2435static ieee80211_rx_result debug_noinline
2436ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2437{
2438 struct ieee80211_local *local = rx->local;
2439 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2440 struct sk_buff *nskb;
2441 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2442 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2443
2444 if (!ieee80211_is_action(mgmt->frame_control))
2445 return RX_CONTINUE;
2446
2447 /*
2448 * For AP mode, hostapd is responsible for handling any action
2449 * frames that we didn't handle, including returning unknown
2450 * ones. For all other modes we will return them to the sender,
2451 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2452 * 802.11-2012 9.24.4.
2e161f78
JB		 2453 * Newer versions of hostapd shall also use the management frame
2454 * registration mechanisms, but older ones still use cooked
2455 * monitor interfaces so push all frames there.
2456 */
554891e6 2457 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2458 (sdata->vif.type == NL80211_IFTYPE_AP ||
2459 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2460 return RX_DROP_MONITOR;
026331c4 2461
4b5ebccc
JB		 2462 if (is_multicast_ether_addr(mgmt->da))
2463 return RX_DROP_MONITOR;
2464
84040805
JB		 2465 /* do not return rejected action frames */
2466 if (mgmt->u.action.category & 0x80)
2467 return RX_DROP_UNUSABLE;
2468
2469 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2470 GFP_ATOMIC);
2471 if (nskb) {
292b4df6 2472 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2473
292b4df6
JL		 2474 nmgmt->u.action.category |= 0x80;
2475 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2476 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2477
2478 memset(nskb->cb, 0, sizeof(nskb->cb));
2479
2480 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2481 }
39192c0b
JB		 2482 dev_kfree_skb(rx->skb);
2483 return RX_QUEUED;
de1ede7a
JB		 2484}
2485
49461622 2486static ieee80211_rx_result debug_noinline
5cf121c3 2487ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2488{
eb9fb5b8 2489 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2490 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2491 __le16 stype;
571ecf67 2492
77a121c3 2493 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2494
77a121c3
JB		 2495 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2496 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2497 sdata->vif.type != NL80211_IFTYPE_STATION)
2498 return RX_DROP_MONITOR;
472dbc45 2499
77a121c3 2500 switch (stype) {
66e67e41 2501 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2502 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2503 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2504 /* process for all: mesh, mlme, ibss */
2505 break;
66e67e41
JB		 2506 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2507 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2508 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2509 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2510 if (is_multicast_ether_addr(mgmt->da) &&
2511 !is_broadcast_ether_addr(mgmt->da))
2512 return RX_DROP_MONITOR;
2513
77a121c3
JB		 2514 /* process only for station */
2515 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2516 return RX_DROP_MONITOR;
2517 break;
2518 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2519 /* process only for ibss */
2520 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2521 return RX_DROP_MONITOR;
2522 break;
2523 default:
2524 return RX_DROP_MONITOR;
2525 }
f9d540ee 2526
77a121c3 2527 /* queue up frame and kick off work to process it */
c1475ca9 2528 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2529 skb_queue_tail(&sdata->skb_queue, rx->skb);
2530 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2531 if (rx->sta)
2532 rx->sta->rx_packets++;
46900298 2533
77a121c3 2534 return RX_QUEUED;
571ecf67
JB		 2535}
2536
5cf121c3 2537/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2538static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2539 struct ieee80211_rate *rate)
3d30d949
MW		 2540{
2541 struct ieee80211_sub_if_data *sdata;
2542 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2543 struct sk_buff *skb = rx->skb, *skb2;
2544 struct net_device *prev_dev = NULL;
eb9fb5b8 2545 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2546 int needed_headroom;
3d30d949 2547
554891e6
JB		 2548 /*
2549 * If cooked monitor has been processed already, then
2550 * don't do it again. If not, set the flag.
2551 */
2552 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2553 goto out_free_skb;
554891e6 2554 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2555
152c477a
JB		 2556 /* If there are no cooked monitor interfaces, just free the SKB */
2557 if (!local->cooked_mntrs)
2558 goto out_free_skb;
2559
293702a3
JB		 2560 /* room for the radiotap header based on driver features */
2561 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2562
293702a3
JB		 2563 if (skb_headroom(skb) < needed_headroom &&
2564 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2565 goto out_free_skb;
3d30d949 2566
293702a3 2567 /* prepend radiotap information */
973ef21a
FF		 2568 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2569 false);
3d30d949
MW		 2570
2571 skb_set_mac_header(skb, 0);
2572 skb->ip_summed = CHECKSUM_UNNECESSARY;
2573 skb->pkt_type = PACKET_OTHERHOST;
2574 skb->protocol = htons(ETH_P_802_2);
2575
2576 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2577 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2578 continue;
2579
05c914fe 2580 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2581 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2582 continue;
2583
2584 if (prev_dev) {
2585 skb2 = skb_clone(skb, GFP_ATOMIC);
2586 if (skb2) {
2587 skb2->dev = prev_dev;
5548a8a1 2588 netif_receive_skb(skb2);
3d30d949
MW		 2589 }
2590 }
2591
2592 prev_dev = sdata->dev;
2593 sdata->dev->stats.rx_packets++;
2594 sdata->dev->stats.rx_bytes += skb->len;
2595 }
2596
2597 if (prev_dev) {
2598 skb->dev = prev_dev;
5548a8a1 2599 netif_receive_skb(skb);
554891e6
JB		 2600 return;
2601 }
3d30d949
MW		 2602
2603 out_free_skb:
2604 dev_kfree_skb(skb);
2605}
2606
aa0c8636
CL		 2607static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2608 ieee80211_rx_result res)
2609{
2610 switch (res) {
2611 case RX_DROP_MONITOR:
2612 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2613 if (rx->sta)
2614 rx->sta->rx_dropped++;
2615 /* fall through */
2616 case RX_CONTINUE: {
2617 struct ieee80211_rate *rate = NULL;
2618 struct ieee80211_supported_band *sband;
2619 struct ieee80211_rx_status *status;
2620
2621 status = IEEE80211_SKB_RXCB((rx->skb));
2622
2623 sband = rx->local->hw.wiphy->bands[status->band];
2624 if (!(status->flag & RX_FLAG_HT))
2625 rate = &sband->bitrates[status->rate_idx];
2626
2627 ieee80211_rx_cooked_monitor(rx, rate);
2628 break;
2629 }
2630 case RX_DROP_UNUSABLE:
2631 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2632 if (rx->sta)
2633 rx->sta->rx_dropped++;
2634 dev_kfree_skb(rx->skb);
2635 break;
2636 case RX_QUEUED:
2637 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2638 break;
2639 }
2640}
571ecf67 2641
24a8fdad 2642static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2643{
58905290 2644 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2645 struct sk_buff *skb;
8944b79f 2646
e32f85f7
LCC		 2647#define CALL_RXH(rxh) \
2648 do { \
2649 res = rxh(rx); \
2650 if (res != RX_CONTINUE) \
2569a826 2651 goto rxh_next; \
e32f85f7 2652 } while (0);
49461622 2653
24a8fdad
CL		 2654 spin_lock(&rx->local->rx_skb_queue.lock);
2655 if (rx->local->running_rx_handler)
2656 goto unlock;
2657
2658 rx->local->running_rx_handler = true;
2659
2660 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2661 spin_unlock(&rx->local->rx_skb_queue.lock);
2662
2569a826
JB		 2663 /*
2664 * all the other fields are valid across frames
2665 * that belong to an aMPDU since they are on the
2666 * same TID from the same station
2667 */
2668 rx->skb = skb;
2669
2670 CALL_RXH(ieee80211_rx_h_decrypt)
2671 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2672 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2673 CALL_RXH(ieee80211_rx_h_sta_process)
2674 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2675 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2676 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2677#ifdef CONFIG_MAC80211_MESH
aa0c8636 2678 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2679 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2680#endif
2154c81c 2681 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2682 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2683 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2684 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2685 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2686 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2687 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2688 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2689
aa0c8636
CL		 2690 rxh_next:
2691 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2692 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2693#undef CALL_RXH
aa0c8636 2694 }
24a8fdad
CL		 2695
2696 rx->local->running_rx_handler = false;
2697
2698 unlock:
2699 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2700}
2701
4406c376 2702static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2703{
aa0c8636
CL		 2704 ieee80211_rx_result res = RX_DROP_MONITOR;
2705
aa0c8636
CL		 2706#define CALL_RXH(rxh) \
2707 do { \
2708 res = rxh(rx); \
2709 if (res != RX_CONTINUE) \
2710 goto rxh_next; \
2711 } while (0);
2712
aa0c8636
CL		 2713 CALL_RXH(ieee80211_rx_h_check)
2714
24a8fdad 2715 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2716
24a8fdad 2717 ieee80211_rx_handlers(rx);
aa0c8636 2718 return;
49461622 2719
2569a826 2720 rxh_next:
aa0c8636
CL		 2721 ieee80211_rx_handlers_result(rx, res);
2722
2723#undef CALL_RXH
58905290
JB		 2724}
2725
2bff8ebf 2726/*
dd318575
JB		 2727 * This function makes calls into the RX path, therefore
2728 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2729 */
2730void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2731{
554891e6
JB		 2732 struct ieee80211_rx_data rx = {
2733 .sta = sta,
2734 .sdata = sta->sdata,
2735 .local = sta->local,
9e26297a
JB		 2736 /* This is OK -- must be QoS data frame */
2737 .security_idx = tid,
2738 .seqno_idx = tid,
fcf8bd3b 2739 .flags = 0,
554891e6 2740 };
2c15a0cf
CL		 2741 struct tid_ampdu_rx *tid_agg_rx;
2742
2743 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2744 if (!tid_agg_rx)
2745 return;
2bff8ebf 2746
2c15a0cf 2747 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2748 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2749 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2750
24a8fdad 2751 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2752}
2753
571ecf67
JB		 2754/* main receive path */
2755
20b01f80 2756static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2757 struct ieee80211_hdr *hdr)
2758{
20b01f80 2759 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2760 struct sk_buff *skb = rx->skb;
2761 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2762 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2763 int multicast = is_multicast_ether_addr(hdr->addr1);
2764
51fb61e7 2765 switch (sdata->vif.type) {
05c914fe 2766 case NL80211_IFTYPE_STATION:
9bc383de 2767 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2768 return 0;
77fdaa12 2769 if (!multicast &&
b203ca39 2770 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2771 if (!(sdata->dev->flags & IFF_PROMISC) ||
2772 sdata->u.mgd.use_4addr)
23a24def 2773 return 0;
554891e6 2774 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2775 }
2776 break;
05c914fe 2777 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2778 if (!bssid)
2779 return 0;
a7767f95 2780 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2781 return 1;
d48b2968
JB		 2782 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2783 return 0;
23a24def 2784 } else if (!multicast &&
b203ca39 2785 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2786 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2787 return 0;
554891e6 2788 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2789 } else if (!rx->sta) {
2790 int rate_idx;
eb9fb5b8 2791 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2792 rate_idx = 0; /* TODO: HT rates */
2793 else
eb9fb5b8 2794 rate_idx = status->rate_idx;
8bf11d8d
JB		 2795 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2796 BIT(rate_idx));
0fb8ca45 2797 }
23a24def 2798 break;
05c914fe 2799 case NL80211_IFTYPE_MESH_POINT:
6032f934 2800 if (!multicast &&
b203ca39 2801 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2802 if (!(sdata->dev->flags & IFF_PROMISC))
2803 return 0;
2804
554891e6 2805 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2806 }
2807 break;
05c914fe
JB		 2808 case NL80211_IFTYPE_AP_VLAN:
2809 case NL80211_IFTYPE_AP:
23a24def 2810 if (!bssid) {
b203ca39 2811 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2812 return 0;
f142c6b9 2813 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2814 /*
2815 * Accept public action frames even when the
2816 * BSSID doesn't match, this is used for P2P
2817 * and location updates. Note that mac80211
2818 * itself never looks at these frames.
2819 */
d48b2968 2820 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2821 return 1;
d48b2968 2822 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2823 return 0;
554891e6 2824 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2825 }
23a24def 2826 break;
05c914fe 2827 case NL80211_IFTYPE_WDS:
a7767f95 2828 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2829 return 0;
b203ca39 2830 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2831 return 0;
2832 break;
f142c6b9
JB		 2833 case NL80211_IFTYPE_P2P_DEVICE:
2834 if (!ieee80211_is_public_action(hdr, skb->len) &&
2835 !ieee80211_is_probe_req(hdr->frame_control) &&
2836 !ieee80211_is_probe_resp(hdr->frame_control) &&
2837 !ieee80211_is_beacon(hdr->frame_control))
2838 return 0;
2839 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2840 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2841 break;
2ca27bcf 2842 default:
fb1c1cd6 2843 /* should never get here */
f142c6b9 2844 WARN_ON_ONCE(1);
fb1c1cd6 2845 break;
23a24def
JB		 2846 }
2847
2848 return 1;
2849}
2850
4406c376
JB		 2851/*
2852 * This function returns whether or not the SKB
2853 * was destined for RX processing or not, which,
2854 * if consume is true, is equivalent to whether
2855 * or not the skb was consumed.
2856 */
2857static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2858 struct sk_buff *skb, bool consume)
2859{
2860 struct ieee80211_local *local = rx->local;
2861 struct ieee80211_sub_if_data *sdata = rx->sdata;
2862 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2863 struct ieee80211_hdr *hdr = (void *)skb->data;
2864 int prepares;
2865
2866 rx->skb = skb;
554891e6 2867 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2868 prepares = prepare_for_handlers(rx, hdr);
2869
2870 if (!prepares)
2871 return false;
2872
4406c376
JB		 2873 if (!consume) {
2874 skb = skb_copy(skb, GFP_ATOMIC);
2875 if (!skb) {
2876 if (net_ratelimit())
2877 wiphy_debug(local->hw.wiphy,
b305dae4 2878 "failed to copy skb for %s\n",
4406c376
JB		 2879 sdata->name);
2880 return true;
2881 }
2882
2883 rx->skb = skb;
2884 }
2885
2886 ieee80211_invoke_rx_handlers(rx);
2887 return true;
2888}
2889
571ecf67 2890/*
6368e4b1
RR		 2891 * This is the actual Rx frames handler. as it blongs to Rx path it must
2892 * be called with rcu_read_lock protection.
571ecf67 2893 */
71ebb4aa 2894static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2895 struct sk_buff *skb)
571ecf67
JB		 2896{
2897 struct ieee80211_local *local = hw_to_local(hw);
2898 struct ieee80211_sub_if_data *sdata;
571ecf67 2899 struct ieee80211_hdr *hdr;
e3cf8b3f 2900 __le16 fc;
5cf121c3 2901 struct ieee80211_rx_data rx;
4406c376 2902 struct ieee80211_sub_if_data *prev;
56af3268 2903 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2904 int err = 0;
571ecf67 2905
e3cf8b3f 2906 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2907 memset(&rx, 0, sizeof(rx));
2908 rx.skb = skb;
2909 rx.local = local;
72abd81b 2910
e3cf8b3f 2911 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2912 local->dot11ReceivedFragmentCount++;
571ecf67 2913
e3cf8b3f
ZY		 2914 if (ieee80211_is_mgmt(fc))
2915 err = skb_linearize(skb);
2916 else
2917 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2918
2919 if (err) {
2920 dev_kfree_skb(skb);
2921 return;
2922 }
2923
2924 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2925 ieee80211_parse_qos(&rx);
d1c3a37c 2926 ieee80211_verify_alignment(&rx);
38f3714d 2927
d48b2968
JB		 2928 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2929 ieee80211_is_beacon(hdr->frame_control)))
2930 ieee80211_scan_rx(local, skb);
2931
e3cf8b3f 2932 if (ieee80211_is_data(fc)) {
56af3268 2933 prev_sta = NULL;
4406c376 2934
7852e361 2935 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2936 if (!prev_sta) {
2937 prev_sta = sta;
2938 continue;
2939 }
2940
2941 rx.sta = prev_sta;
2942 rx.sdata = prev_sta->sdata;
4406c376 2943 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2944
56af3268 2945 prev_sta = sta;
4406c376 2946 }
56af3268
BG		 2947
2948 if (prev_sta) {
2949 rx.sta = prev_sta;
2950 rx.sdata = prev_sta->sdata;
2951
4406c376 2952 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2953 return;
8e26d5ad 2954 goto out;
56af3268 2955 }
4406c376
JB		 2956 }
2957
4b0dd98e 2958 prev = NULL;
b2e7771e 2959
4b0dd98e
JB		 2960 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2961 if (!ieee80211_sdata_running(sdata))
2962 continue;
340e11f3 2963
4b0dd98e
JB		 2964 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2965 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2966 continue;
340e11f3 2967
4b0dd98e
JB		 2968 /*
2969 * frame is destined for this interface, but if it's
2970 * not also for the previous one we handle that after
2971 * the loop to avoid copying the SKB once too much
2972 */
4bb29f8c 2973
4b0dd98e 2974 if (!prev) {
abe60632 2975 prev = sdata;
4b0dd98e 2976 continue;
340e11f3 2977 }
4bb29f8c 2978
7852e361 2979 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2980 rx.sdata = prev;
2981 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2982
4b0dd98e
JB		 2983 prev = sdata;
2984 }
2985
2986 if (prev) {
7852e361 2987 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2988 rx.sdata = prev;
4406c376 2989
4b0dd98e
JB		 2990 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2991 return;
571ecf67 2992 }
4406c376 2993
8e26d5ad 2994 out:
4406c376 2995 dev_kfree_skb(skb);
571ecf67 2996}
6368e4b1
RR		 2997
2998/*
2999 * This is the receive path handler. It is called by a low level driver when an
3000 * 802.11 MPDU is received from the hardware.
3001 */
103bf9f7 3002void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3003{
3004 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3005 struct ieee80211_rate *rate = NULL;
3006 struct ieee80211_supported_band *sband;
f1d58c25 3007 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3008
d20ef63d
JB		 3009 WARN_ON_ONCE(softirq_count() == 0);
3010
444e3803 3011 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3012 goto drop;
8318d78a
JB		 3013
3014 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3015 if (WARN_ON(!sband))
3016 goto drop;
8318d78a 3017
89c3a8ac
JB		 3018 /*
3019 * If we're suspending, it is possible although not too likely
3020 * that we'd be receiving frames after having already partially
3021 * quiesced the stack. We can't process such frames then since
3022 * that might, for example, cause stations to be added or other
3023 * driver callbacks be invoked.
3024 */
77a980dc
JB		 3025 if (unlikely(local->quiescing || local->suspended))
3026 goto drop;
89c3a8ac 3027
04800ada
AN		 3028 /* We might be during a HW reconfig, prevent Rx for the same reason */
3029 if (unlikely(local->in_reconfig))
3030 goto drop;
3031
ea77f12f
JB		 3032 /*
3033 * The same happens when we're not even started,
3034 * but that's worth a warning.
3035 */
77a980dc
JB		 3036 if (WARN_ON(!local->started))
3037 goto drop;
ea77f12f 3038
fc885189 3039 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3040 /*
fc885189
JB		 3041 * Validate the rate, unless a PLCP error means that
3042 * we probably can't have a valid rate here anyway.
e5d6eb83 3043 */
fc885189
JB		 3044
3045 if (status->flag & RX_FLAG_HT) {
3046 /*
3047 * rate_idx is MCS index, which can be [0-76]
3048 * as documented on:
3049 *
3050 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3051 *
3052 * Anything else would be some sort of driver or
3053 * hardware error. The driver should catch hardware
3054 * errors.
3055 */
444e3803 3056 if (WARN(status->rate_idx > 76,
fc885189
JB		 3057 "Rate marked as an HT rate but passed "
3058 "status->rate_idx is not "
3059 "an MCS index [0-76]: %d (0x%02x)\n",
3060 status->rate_idx,
3061 status->rate_idx))
3062 goto drop;
3063 } else {
444e3803 3064 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3065 goto drop;
3066 rate = &sband->bitrates[status->rate_idx];
3067 }
0fb8ca45 3068 }
6368e4b1 3069
554891e6
JB		 3070 status->rx_flags = 0;
3071
6368e4b1
RR		 3072 /*
3073 * key references and virtual interfaces are protected using RCU
3074 * and this requires that we are in a read-side RCU section during
3075 * receive processing
3076 */
3077 rcu_read_lock();
3078
3079 /*
3080 * Frames with failed FCS/PLCP checksum are not returned,
3081 * all other frames are returned without radiotap header
3082 * if it was previously present.
3083 * Also, frames with less than 16 bytes are dropped.
3084 */
f1d58c25 3085 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3086 if (!skb) {
3087 rcu_read_unlock();
3088 return;
3089 }
3090
e1e54068
JB		 3091 ieee80211_tpt_led_trig_rx(local,
3092 ((struct ieee80211_hdr *)skb->data)->frame_control,
3093 skb->len);
071d9ac2 3094 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3095
3096 rcu_read_unlock();
77a980dc
JB		 3097
3098 return;
3099 drop:
3100 kfree_skb(skb);
6368e4b1 3101}
103bf9f7 3102EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3103
3104/* This is a version of the rx handler that can be called from hard irq
3105 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3106void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3107{
3108 struct ieee80211_local *local = hw_to_local(hw);
3109
3110 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3111
571ecf67
JB		 3112 skb->pkt_type = IEEE80211_RX_MSG;
3113 skb_queue_tail(&local->skb_queue, skb);
3114 tasklet_schedule(&local->tasklet);
3115}
3116EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)