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mac80211: use CMAC_PN_LEN
[mirror_ubuntu-hirsute-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
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
1df332e8 57static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
b2e7771e 58{
f1d58c25 59 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 60 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e 61
4c298677
JB		 62 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
63 RX_FLAG_FAILED_PLCP_CRC |
64 RX_FLAG_AMPDU_IS_ZEROLEN))
b2e7771e 65 return 1;
0869aea0 66 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 67 return 1;
87228f57
HH		 68 if (ieee80211_is_ctl(hdr->frame_control) &&
69 !ieee80211_is_pspoll(hdr->frame_control) &&
70 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 71 return 1;
72 return 0;
73}
74
601ae7f2
BR		 75static int
76ieee80211_rx_radiotap_len(struct ieee80211_local *local,
77 struct ieee80211_rx_status *status)
78{
79 int len;
80
81 /* always present fields */
82 len = sizeof(struct ieee80211_radiotap_header) + 9;
83
f4bda337 84 if (ieee80211_have_rx_timestamp(status))
601ae7f2 85 len += 8;
7fee5372 86 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 87 len += 1;
601ae7f2
BR		 88
89 if (len & 1) /* padding for RX_FLAGS if necessary */
90 len++;
91
6d744bac
JB		 92 if (status->flag & RX_FLAG_HT) /* HT info */
93 len += 3;
94
4c298677
JB		 95 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
96 /* padding */
97 while (len & 3)
98 len++;
99 len += 8;
100 }
101
601ae7f2
BR		 102 return len;
103}
104
00ea6deb 105/*
601ae7f2
BR		 106 * ieee80211_add_rx_radiotap_header - add radiotap header
107 *
108 * add a radiotap header containing all the fields which the hardware provided.
109 */
110static void
111ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct sk_buff *skb,
601ae7f2 113 struct ieee80211_rate *rate,
973ef21a 114 int rtap_len, bool has_fcs)
601ae7f2 115{
f1d58c25 116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 117 struct ieee80211_radiotap_header *rthdr;
118 unsigned char *pos;
6a86b9c7 119 u16 rx_flags = 0;
f4bda337
TP		 120 int mpdulen;
121
122 mpdulen = skb->len;
123 if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)))
124 mpdulen += FCS_LEN;
601ae7f2
BR		 125
126 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
127 memset(rthdr, 0, rtap_len);
128
129 /* radiotap header, set always present flags */
130 rthdr->it_present =
131 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 132 (1 << IEEE80211_RADIOTAP_CHANNEL) |
133 (1 << IEEE80211_RADIOTAP_ANTENNA) |
134 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
135 rthdr->it_len = cpu_to_le16(rtap_len);
136
1df332e8 137 pos = (unsigned char *)(rthdr + 1);
601ae7f2
BR		 138
139 /* the order of the following fields is important */
140
141 /* IEEE80211_RADIOTAP_TSFT */
f4bda337
TP		 142 if (ieee80211_have_rx_timestamp(status)) {
143 put_unaligned_le64(
144 ieee80211_calculate_rx_timestamp(local, status,
145 mpdulen, 0),
146 pos);
1df332e8 147 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
601ae7f2
BR		 148 pos += 8;
149 }
150
151 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 152 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 153 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 154 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
155 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 156 if (status->flag & RX_FLAG_SHORTPRE)
157 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 158 pos++;
159
160 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 161 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 162 /*
f8d1ccf1 163 * Without rate information don't add it. If we have,
38f37be2 164 * MCS information is a separate field in radiotap,
73b48099
JB		 165 * added below. The byte here is needed as padding
166 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 167 */
168 *pos = 0;
8d6f658e 169 } else {
ebe6c7ba 170 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 171 *pos = rate->bitrate / 5;
8d6f658e 172 }
601ae7f2
BR		 173 pos++;
174
175 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 176 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 177 pos += 2;
178 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 179 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
180 pos);
5f0b7de5
JB		 181 else if (status->flag & RX_FLAG_HT)
182 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
183 pos);
f8d1ccf1 184 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 185 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
186 pos);
f8d1ccf1 187 else if (rate)
6a86b9c7
JB		 188 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
189 pos);
f8d1ccf1
JB		 190 else
191 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 192 pos += 2;
193
194 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 195 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
196 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 197 *pos = status->signal;
198 rthdr->it_present |=
199 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
200 pos++;
201 }
202
601ae7f2
BR		 203 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
204
205 /* IEEE80211_RADIOTAP_ANTENNA */
206 *pos = status->antenna;
207 pos++;
208
601ae7f2
BR		 209 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
210
211 /* IEEE80211_RADIOTAP_RX_FLAGS */
212 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 213 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 214 pos++;
aae89831 215 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 216 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
217 put_unaligned_le16(rx_flags, pos);
601ae7f2 218 pos += 2;
6d744bac
JB		 219
220 if (status->flag & RX_FLAG_HT) {
221 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 222 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 223 *pos = 0;
224 if (status->flag & RX_FLAG_SHORT_GI)
225 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
226 if (status->flag & RX_FLAG_40MHZ)
227 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 228 if (status->flag & RX_FLAG_HT_GF)
229 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
6d744bac
JB		 230 pos++;
231 *pos++ = status->rate_idx;
232 }
4c298677
JB		 233
234 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
235 u16 flags = 0;
236
237 /* ensure 4 byte alignment */
238 while ((pos - (u8 *)rthdr) & 3)
239 pos++;
240 rthdr->it_present |=
241 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
242 put_unaligned_le32(status->ampdu_reference, pos);
243 pos += 4;
244 if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN)
245 flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN;
246 if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN)
247 flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN;
248 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
249 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
250 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
251 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
252 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
253 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
254 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
255 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
256 put_unaligned_le16(flags, pos);
257 pos += 2;
258 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
259 *pos++ = status->ampdu_delimiter_crc;
260 else
261 *pos++ = 0;
262 *pos++ = 0;
263 }
601ae7f2
BR		 264}
265
b2e7771e
JB		 266/*
267 * This function copies a received frame to all monitor interfaces and
268 * returns a cleaned-up SKB that no longer includes the FCS nor the
269 * radiotap header the driver might have added.
270 */
271static struct sk_buff *
272ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 273 struct ieee80211_rate *rate)
b2e7771e 274{
f1d58c25 275 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 276 struct ieee80211_sub_if_data *sdata;
293702a3 277 int needed_headroom;
b2e7771e
JB		 278 struct sk_buff *skb, *skb2;
279 struct net_device *prev_dev = NULL;
280 int present_fcs_len = 0;
b2e7771e
JB		 281
282 /*
283 * First, we may need to make a copy of the skb because
284 * (1) we need to modify it for radiotap (if not present), and
285 * (2) the other RX handlers will modify the skb we got.
286 *
287 * We don't need to, of course, if we aren't going to return
288 * the SKB because it has a bad FCS/PLCP checksum.
289 */
0869aea0
JB		 290
291 /* room for the radiotap header based on driver features */
292 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 293
294 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
295 present_fcs_len = FCS_LEN;
296
e3cf8b3f
ZY		 297 /* make sure hdr->frame_control is on the linear part */
298 if (!pskb_may_pull(origskb, 2)) {
299 dev_kfree_skb(origskb);
300 return NULL;
301 }
302
b2e7771e 303 if (!local->monitors) {
0869aea0 304 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 305 dev_kfree_skb(origskb);
306 return NULL;
307 }
308
0869aea0 309 return remove_monitor_info(local, origskb);
b2e7771e
JB		 310 }
311
0869aea0 312 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 313 /* only need to expand headroom if necessary */
314 skb = origskb;
315 origskb = NULL;
316
317 /*
318 * This shouldn't trigger often because most devices have an
319 * RX header they pull before we get here, and that should
320 * be big enough for our radiotap information. We should
321 * probably export the length to drivers so that we can have
322 * them allocate enough headroom to start with.
323 */
324 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 325 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 326 dev_kfree_skb(skb);
327 return NULL;
328 }
329 } else {
330 /*
331 * Need to make a copy and possibly remove radiotap header
332 * and FCS from the original.
333 */
334 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
335
0869aea0 336 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 337
338 if (!skb)
339 return origskb;
340 }
341
0869aea0 342 /* prepend radiotap information */
973ef21a
FF		 343 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
344 true);
b2e7771e 345
ce3edf6d 346 skb_reset_mac_header(skb);
b2e7771e
JB		 347 skb->ip_summed = CHECKSUM_UNNECESSARY;
348 skb->pkt_type = PACKET_OTHERHOST;
349 skb->protocol = htons(ETH_P_802_2);
350
351 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 352 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 353 continue;
354
3d30d949
MW		 355 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
356 continue;
357
9607e6b6 358 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 359 continue;
360
b2e7771e
JB		 361 if (prev_dev) {
362 skb2 = skb_clone(skb, GFP_ATOMIC);
363 if (skb2) {
364 skb2->dev = prev_dev;
5548a8a1 365 netif_receive_skb(skb2);
b2e7771e
JB		 366 }
367 }
368
369 prev_dev = sdata->dev;
370 sdata->dev->stats.rx_packets++;
371 sdata->dev->stats.rx_bytes += skb->len;
372 }
373
374 if (prev_dev) {
375 skb->dev = prev_dev;
5548a8a1 376 netif_receive_skb(skb);
b2e7771e
JB		 377 } else
378 dev_kfree_skb(skb);
379
380 return origskb;
381}
382
5cf121c3 383static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 384{
238f74a2 385 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 386 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 387 int tid, seqno_idx, security_idx;
6e0d114d
JB		 388
389 /* does the frame have a qos control field? */
238f74a2
HH		 390 if (ieee80211_is_data_qos(hdr->frame_control)) {
391 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 392 /* frame has qos control */
238f74a2 393 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 394 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 395 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 396
397 seqno_idx = tid;
398 security_idx = tid;
6e0d114d 399 } else {
1411f9b5
JB		 400 /*
401 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
402 *
403 * Sequence numbers for management frames, QoS data
404 * frames with a broadcast/multicast address in the
405 * Address 1 field, and all non-QoS data frames sent
406 * by QoS STAs are assigned using an additional single
407 * modulo-4096 counter, [...]
408 *
409 * We also use that counter for non-QoS STAs.
410 */
9e26297a
JB		 411 seqno_idx = NUM_RX_DATA_QUEUES;
412 security_idx = 0;
413 if (ieee80211_is_mgmt(hdr->frame_control))
414 security_idx = NUM_RX_DATA_QUEUES;
415 tid = 0;
6e0d114d 416 }
52865dfd 417
9e26297a
JB		 418 rx->seqno_idx = seqno_idx;
419 rx->security_idx = security_idx;
6e0d114d
JB		 420 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
421 * For now, set skb->priority to 0 for other cases. */
422 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 423}
6e0d114d 424
d1c3a37c
JB		 425/**
426 * DOC: Packet alignment
427 *
428 * Drivers always need to pass packets that are aligned to two-byte boundaries
429 * to the stack.
430 *
431 * Additionally, should, if possible, align the payload data in a way that
432 * guarantees that the contained IP header is aligned to a four-byte
433 * boundary. In the case of regular frames, this simply means aligning the
434 * payload to a four-byte boundary (because either the IP header is directly
435 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 436 * in front of it). If the payload data is not properly aligned and the
437 * architecture doesn't support efficient unaligned operations, mac80211
438 * will align the data.
d1c3a37c
JB		 439 *
440 * With A-MSDU frames, however, the payload data address must yield two modulo
441 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
442 * push the IP header further back to a multiple of four again. Thankfully, the
443 * specs were sane enough this time around to require padding each A-MSDU
444 * subframe to a length that is a multiple of four.
445 *
25985edc 446 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 447 * the payload is not supported, the driver is required to move the 802.11
448 * header to be directly in front of the payload in that case.
449 */
450static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 451{
59d9cb07
KV		 452#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
453 WARN_ONCE((unsigned long)rx->skb->data & 1,
454 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 455#endif
6e0d114d
JB		 456}
457
6368e4b1 458
571ecf67
JB		 459/* rx handlers */
460
3cfcf6ac
JM		 461static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
462{
463 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
464
465 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
466 return 0;
467
468 return ieee80211_is_robust_mgmt_frame(hdr);
469}
470
471
472static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
473{
474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
475
476 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
477 return 0;
478
479 return ieee80211_is_robust_mgmt_frame(hdr);
480}
481
482
483/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
484static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
485{
486 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
487 struct ieee80211_mmie *mmie;
488
1df332e8 489 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
3cfcf6ac
JM		 490 return -1;
491
492 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
493 return -1; /* not a robust management frame */
494
495 mmie = (struct ieee80211_mmie *)
496 (skb->data + skb->len - sizeof(*mmie));
497 if (mmie->element_id != WLAN_EID_MMIE ||
498 mmie->length != sizeof(*mmie) - 2)
499 return -1;
500
501 return le16_to_cpu(mmie->key_id);
502}
503
1df332e8 504static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 505{
a7767f95 506 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 507 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 508
a7767f95 509 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 510 if (is_multicast_ether_addr(hdr->addr1)) {
511 if (ieee80211_has_tods(hdr->frame_control) ||
1df332e8 512 !ieee80211_has_fromds(hdr->frame_control))
3c5772a5 513 return RX_DROP_MONITOR;
b203ca39 514 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 515 return RX_DROP_MONITOR;
516 } else {
517 if (!ieee80211_has_a4(hdr->frame_control))
518 return RX_DROP_MONITOR;
b203ca39 519 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 520 return RX_DROP_MONITOR;
521 }
33b64eb2
LCC		 522 }
523
524 /* If there is not an established peer link and this is not a peer link
525 * establisment frame, beacon or probe, drop the frame.
526 */
527
57cf8043 528 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 529 struct ieee80211_mgmt *mgmt;
d6d1a5a7 530
a7767f95 531 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 532 return RX_DROP_MONITOR;
533
a7767f95 534 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 535 u8 category;
9b395bc3
JB		 536
537 /* make sure category field is present */
538 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
539 return RX_DROP_MONITOR;
540
33b64eb2 541 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 542 category = mgmt->u.action.category;
543 if (category != WLAN_CATEGORY_MESH_ACTION &&
1df332e8 544 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 545 return RX_DROP_MONITOR;
33b64eb2 546 return RX_CONTINUE;
33b64eb2
LCC		 547 }
548
a7767f95
HH		 549 if (ieee80211_is_probe_req(hdr->frame_control) ||
550 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 551 ieee80211_is_beacon(hdr->frame_control) ||
552 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 553 return RX_CONTINUE;
554
555 return RX_DROP_MONITOR;
a7767f95
HH		 556 }
557
902acc78
JB		 558 return RX_CONTINUE;
559}
33b64eb2 560
1edfb1af
JB		 561#define SEQ_MODULO 0x1000
562#define SEQ_MASK 0xfff
563
564static inline int seq_less(u16 sq1, u16 sq2)
565{
566 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
567}
568
569static inline u16 seq_inc(u16 sq)
570{
571 return (sq + 1) & SEQ_MASK;
572}
573
574static inline u16 seq_sub(u16 sq1, u16 sq2)
575{
576 return (sq1 - sq2) & SEQ_MASK;
577}
578
d3b2fb53 579static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 580 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 581 int index)
1edfb1af 582{
d3b2fb53 583 struct ieee80211_local *local = sdata->local;
1edfb1af 584 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 585 struct ieee80211_rx_status *status;
1edfb1af 586
dd318575
JB		 587 lockdep_assert_held(&tid_agg_rx->reorder_lock);
588
1edfb1af
JB		 589 if (!skb)
590 goto no_frame;
591
071d9ac2 592 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 593 tid_agg_rx->stored_mpdu_num--;
594 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 595 status = IEEE80211_SKB_RXCB(skb);
596 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 597 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 598
599no_frame:
600 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
601}
602
d3b2fb53 603static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 604 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 605 u16 head_seq_num)
1edfb1af
JB		 606{
607 int index;
608
dd318575
JB		 609 lockdep_assert_held(&tid_agg_rx->reorder_lock);
610
1edfb1af
JB		 611 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
612 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
613 tid_agg_rx->buf_size;
d3b2fb53 614 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
1edfb1af
JB		 615 }
616}
617
618/*
619 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
620 * the skb was added to the buffer longer than this time ago, the earlier
621 * frames that have not yet been received are assumed to be lost and the skb
622 * can be released for processing. This may also release other skb's from the
623 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 624 *
625 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 626 */
627#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
628
d3b2fb53 629static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
24a8fdad 630 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 631{
2bff8ebf 632 int index, j;
aa0c8636 633
dd318575
JB		 634 lockdep_assert_held(&tid_agg_rx->reorder_lock);
635
aa0c8636
CL		 636 /* release the buffer until next missing frame */
637 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
638 tid_agg_rx->buf_size;
639 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 640 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 641 /*
642 * No buffers ready to be released, but check whether any
643 * frames in the reorder buffer have timed out.
644 */
aa0c8636
CL		 645 int skipped = 1;
646 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
647 j = (j + 1) % tid_agg_rx->buf_size) {
648 if (!tid_agg_rx->reorder_buf[j]) {
649 skipped++;
650 continue;
651 }
499fe9a4
DH		 652 if (skipped &&
653 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 654 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 655 goto set_release_timer;
aa0c8636 656
bdcbd8e0
JB		 657 ht_dbg_ratelimited(sdata,
658 "release an RX reorder frame due to timeout on earlier frames\n");
d3b2fb53 659 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
aa0c8636
CL		 660
661 /*
662 * Increment the head seq# also for the skipped slots.
663 */
664 tid_agg_rx->head_seq_num =
665 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
666 skipped = 0;
667 }
668 } else while (tid_agg_rx->reorder_buf[index]) {
d3b2fb53 669 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
aa0c8636
CL		 670 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
671 tid_agg_rx->buf_size;
672 }
2bff8ebf
CL		 673
674 if (tid_agg_rx->stored_mpdu_num) {
675 j = index = seq_sub(tid_agg_rx->head_seq_num,
676 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
677
678 for (; j != (index - 1) % tid_agg_rx->buf_size;
679 j = (j + 1) % tid_agg_rx->buf_size) {
680 if (tid_agg_rx->reorder_buf[j])
681 break;
682 }
683
684 set_release_timer:
685
686 mod_timer(&tid_agg_rx->reorder_timer,
334df731 687 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 688 HT_RX_REORDER_BUF_TIMEOUT);
689 } else {
690 del_timer(&tid_agg_rx->reorder_timer);
691 }
aa0c8636
CL		 692}
693
1edfb1af
JB		 694/*
695 * As this function belongs to the RX path it must be under
696 * rcu_read_lock protection. It returns false if the frame
697 * can be processed immediately, true if it was consumed.
698 */
d3b2fb53 699static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 700 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 701 struct sk_buff *skb)
1edfb1af
JB		 702{
703 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
704 u16 sc = le16_to_cpu(hdr->seq_ctrl);
705 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
706 u16 head_seq_num, buf_size;
707 int index;
2bff8ebf 708 bool ret = true;
1edfb1af 709
dd318575
JB		 710 spin_lock(&tid_agg_rx->reorder_lock);
711
1edfb1af
JB		 712 buf_size = tid_agg_rx->buf_size;
713 head_seq_num = tid_agg_rx->head_seq_num;
714
715 /* frame with out of date sequence number */
716 if (seq_less(mpdu_seq_num, head_seq_num)) {
717 dev_kfree_skb(skb);
2bff8ebf 718 goto out;
1edfb1af
JB		 719 }
720
721 /*
722 * If frame the sequence number exceeds our buffering window
723 * size release some previous frames to make room for this one.
724 */
725 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
726 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
727 /* release stored frames up to new head to stack */
d3b2fb53
JB		 728 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
729 head_seq_num);
1edfb1af
JB		 730 }
731
732 /* Now the new frame is always in the range of the reordering buffer */
733
734 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
735
736 /* check if we already stored this frame */
737 if (tid_agg_rx->reorder_buf[index]) {
738 dev_kfree_skb(skb);
2bff8ebf 739 goto out;
1edfb1af
JB		 740 }
741
742 /*
743 * If the current MPDU is in the right order and nothing else
744 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 745 * If it is first but there's something stored, we may be able
746 * to release frames after this one.
1edfb1af
JB		 747 */
748 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
749 tid_agg_rx->stored_mpdu_num == 0) {
750 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 751 ret = false;
752 goto out;
1edfb1af
JB		 753 }
754
755 /* put the frame in the reordering buffer */
756 tid_agg_rx->reorder_buf[index] = skb;
757 tid_agg_rx->reorder_time[index] = jiffies;
758 tid_agg_rx->stored_mpdu_num++;
d3b2fb53 759 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
1edfb1af 760
2bff8ebf
CL		 761 out:
762 spin_unlock(&tid_agg_rx->reorder_lock);
763 return ret;
1edfb1af
JB		 764}
765
766/*
767 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
768 * true if the MPDU was buffered, false if it should be processed.
769 */
24a8fdad 770static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 771{
2569a826
JB		 772 struct sk_buff *skb = rx->skb;
773 struct ieee80211_local *local = rx->local;
1edfb1af 774 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 775 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 776 struct sta_info *sta = rx->sta;
1edfb1af
JB		 777 struct tid_ampdu_rx *tid_agg_rx;
778 u16 sc;
6cc00d54 779 u8 tid, ack_policy;
1edfb1af
JB		 780
781 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 782 goto dont_reorder;
1edfb1af
JB		 783
784 /*
785 * filter the QoS data rx stream according to
786 * STA/TID and check if this STA/TID is on aggregation
787 */
788
1edfb1af 789 if (!sta)
2569a826 790 goto dont_reorder;
1edfb1af 791
6cc00d54
TP		 792 ack_policy = *ieee80211_get_qos_ctl(hdr) &
793 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 794 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
795
a87f736d
JB		 796 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
797 if (!tid_agg_rx)
798 goto dont_reorder;
1edfb1af
JB		 799
800 /* qos null data frames are excluded */
801 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 802 goto dont_reorder;
1edfb1af 803
6cc00d54
TP		 804 /* not part of a BA session */
805 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
806 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
807 goto dont_reorder;
808
660c6a44
TP		 809 /* not actually part of this BA session */
810 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
811 goto dont_reorder;
812
1edfb1af
JB		 813 /* new, potentially un-ordered, ampdu frame - process it */
814
815 /* reset session timer */
816 if (tid_agg_rx->timeout)
12d3952f 817 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 818
819 /* if this mpdu is fragmented - terminate rx aggregation session */
820 sc = le16_to_cpu(hdr->seq_ctrl);
821 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 822 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 823 skb_queue_tail(&rx->sdata->skb_queue, skb);
824 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 825 return;
1edfb1af
JB		 826 }
827
a87f736d
JB		 828 /*
829 * No locking needed -- we will only ever process one
830 * RX packet at a time, and thus own tid_agg_rx. All
831 * other code manipulating it needs to (and does) make
832 * sure that we cannot get to it any more before doing
833 * anything with it.
834 */
d3b2fb53 835 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
2569a826
JB		 836 return;
837
838 dont_reorder:
24a8fdad 839 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 840}
33b64eb2 841
49461622 842static ieee80211_rx_result debug_noinline
5cf121c3 843ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 844{
a7767f95 845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 846 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 847
848 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
849 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 850 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 851 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 852 hdr->seq_ctrl)) {
554891e6 853 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 854 rx->local->dot11FrameDuplicateCount++;
855 rx->sta->num_duplicates++;
856 }
b1f93314 857 return RX_DROP_UNUSABLE;
571ecf67 858 } else
9e26297a 859 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 860 }
861
571ecf67
JB		 862 if (unlikely(rx->skb->len < 16)) {
863 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 864 return RX_DROP_MONITOR;
571ecf67
JB		 865 }
866
571ecf67
JB		 867 /* Drop disallowed frame classes based on STA auth/assoc state;
868 * IEEE 802.11, Chap 5.5.
869 *
ccd7b362
JB		 870 * mac80211 filters only based on association state, i.e. it drops
871 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 872 * deauth/disassoc frames when needed. In addition, hostapd is
873 * responsible for filtering on both auth and assoc states.
874 */
33b64eb2 875
902acc78 876 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 877 return ieee80211_rx_mesh_check(rx);
33b64eb2 878
a7767f95
HH		 879 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
880 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 881 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 882 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 883 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 884 /*
885 * accept port control frames from the AP even when it's not
886 * yet marked ASSOC to prevent a race where we don't set the
887 * assoc bit quickly enough before it sends the first frame
888 */
889 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2 890 ieee80211_is_data_present(hdr->frame_control)) {
6dbda2d0
JB		 891 unsigned int hdrlen;
892 __be16 ethertype;
893
894 hdrlen = ieee80211_hdrlen(hdr->frame_control);
895
896 if (rx->skb->len < hdrlen + 8)
897 return RX_DROP_MONITOR;
898
899 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
900 if (ethertype == rx->sdata->control_port_protocol)
2a33bee2
GE		 901 return RX_CONTINUE;
902 }
21fc7560
JB		 903
904 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
905 cfg80211_rx_spurious_frame(rx->sdata->dev,
906 hdr->addr2,
907 GFP_ATOMIC))
908 return RX_DROP_UNUSABLE;
909
e4c26add 910 return RX_DROP_MONITOR;
2a33bee2 911 }
571ecf67 912
9ae54c84 913 return RX_CONTINUE;
570bd537
JB		 914}
915
916
49461622 917static ieee80211_rx_result debug_noinline
5cf121c3 918ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 919{
eb9fb5b8
JB		 920 struct sk_buff *skb = rx->skb;
921 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
922 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 923 int keyidx;
924 int hdrlen;
e4c26add 925 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 926 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 927 int mmie_keyidx = -1;
761ab470 928 __le16 fc;
570bd537 929
3017b80b
JB		 930 /*
931 * Key selection 101
932 *
3cfcf6ac 933 * There are four types of keys:
3017b80b 934 * - GTK (group keys)
3cfcf6ac 935 * - IGTK (group keys for management frames)
3017b80b
JB		 936 * - PTK (pairwise keys)
937 * - STK (station-to-station pairwise keys)
938 *
939 * When selecting a key, we have to distinguish between multicast
940 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 941 * use PTKs and STKs while the former always use GTKs and IGTKs.
942 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
943 * unicast frames can also use key indices like GTKs. Hence, if we
944 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 945 *
8dc06a1c
JB		 946 * Note that in a regular BSS, multicast frames are sent by the
947 * AP only, associated stations unicast the frame to the AP first
948 * which then multicasts it on their behalf.
949 *
3017b80b
JB		 950 * There is also a slight problem in IBSS mode: GTKs are negotiated
951 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 952 * The spec seems to expect that one negotiates the same key with
953 * every station but there's no such requirement; VLANs could be
954 * possible.
3017b80b
JB		 955 */
956
3017b80b 957 /*
1990af8d 958 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 959 * addressed to us nor a multicast frame.
960 */
554891e6 961 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 962 return RX_CONTINUE;
3017b80b 963
2569a826
JB		 964 /* start without a key */
965 rx->key = NULL;
966
d4e46a3d 967 if (rx->sta)
e31b8213 968 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 969
761ab470
JB		 970 fc = hdr->frame_control;
971
972 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 973 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
974
e31b8213
JB		 975 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
976 rx->key = sta_ptk;
dc1580dd
JB		 977 if ((status->flag & RX_FLAG_DECRYPTED) &&
978 (status->flag & RX_FLAG_IV_STRIPPED))
979 return RX_CONTINUE;
0c7c10c7 980 /* Skip decryption if the frame is not protected. */
761ab470 981 if (!ieee80211_has_protected(fc))
0c7c10c7 982 return RX_CONTINUE;
3cfcf6ac
JM		 983 } else if (mmie_keyidx >= 0) {
984 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 985 if ((status->flag & RX_FLAG_DECRYPTED) &&
986 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 987 return RX_CONTINUE;
988
989 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
990 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
991 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 992 if (rx->sta)
993 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
994 if (!rx->key)
995 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 996 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 997 /*
998 * The frame was not protected, so skip decryption. However, we
999 * need to set rx->key if there is a key that could have been
1000 * used so that the frame may be dropped if encryption would
1001 * have been expected.
1002 */
1003 struct ieee80211_key *key = NULL;
897bed8b
JB		 1004 struct ieee80211_sub_if_data *sdata = rx->sdata;
1005 int i;
1006
761ab470 1007 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 1008 is_multicast_ether_addr(hdr->addr1) &&
1009 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1010 rx->key = key;
897bed8b
JB		 1011 else {
1012 if (rx->sta) {
1013 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1014 key = rcu_dereference(rx->sta->gtk[i]);
1015 if (key)
1016 break;
1017 }
1018 }
1019 if (!key) {
1020 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1021 key = rcu_dereference(sdata->keys[i]);
1022 if (key)
1023 break;
1024 }
1025 }
1026 if (key)
1027 rx->key = key;
1028 }
0c7c10c7 1029 return RX_CONTINUE;
571ecf67 1030 } else {
39184b15 1031 u8 keyid;
3017b80b
JB		 1032 /*
1033 * The device doesn't give us the IV so we won't be
1034 * able to look up the key. That's ok though, we
1035 * don't need to decrypt the frame, we just won't
1036 * be able to keep statistics accurate.
1037 * Except for key threshold notifications, should
1038 * we somehow allow the driver to tell us which key
1039 * the hardware used if this flag is set?
1040 */
eb9fb5b8
JB		 1041 if ((status->flag & RX_FLAG_DECRYPTED) &&
1042 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1043 return RX_CONTINUE;
3017b80b 1044
761ab470 1045 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1046
1047 if (rx->skb->len < 8 + hdrlen)
e4c26add 1048 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1049
1050 /*
1051 * no need to call ieee80211_wep_get_keyidx,
1052 * it verifies a bunch of things we've done already
1053 */
39184b15
ZY		 1054 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1055 keyidx = keyid >> 6;
3017b80b 1056
e31b8213
JB		 1057 /* check per-station GTK first, if multicast packet */
1058 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1059 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1060
e31b8213
JB		 1061 /* if not found, try default key */
1062 if (!rx->key) {
1063 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1064
1065 /*
1066 * RSNA-protected unicast frames should always be
1067 * sent with pairwise or station-to-station keys,
1068 * but for WEP we allow using a key index as well.
1069 */
1070 if (rx->key &&
1071 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1072 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1073 !is_multicast_ether_addr(hdr->addr1))
1074 rx->key = NULL;
1075 }
571ecf67
JB		 1076 }
1077
3017b80b 1078 if (rx->key) {
95acac61
JB		 1079 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1080 return RX_DROP_MONITOR;
1081
571ecf67 1082 rx->key->tx_rx_count++;
011bfcc4 1083 /* TODO: add threshold stuff again */
1990af8d 1084 } else {
e4c26add 1085 return RX_DROP_MONITOR;
70f08765
JB		 1086 }
1087
97359d12
JB		 1088 switch (rx->key->conf.cipher) {
1089 case WLAN_CIPHER_SUITE_WEP40:
1090 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1091 result = ieee80211_crypto_wep_decrypt(rx);
1092 break;
97359d12 1093 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1094 result = ieee80211_crypto_tkip_decrypt(rx);
1095 break;
97359d12 1096 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1097 result = ieee80211_crypto_ccmp_decrypt(rx);
1098 break;
97359d12 1099 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1100 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1101 break;
3ffc2a90
JB		 1102 default:
1103 /*
1104 * We can reach here only with HW-only algorithms
1105 * but why didn't it decrypt the frame?!
1106 */
1107 return RX_DROP_UNUSABLE;
70f08765
JB		 1108 }
1109
a8286911
JB		 1110 /* the hdr variable is invalid after the decrypt handlers */
1111
e2f036da 1112 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1113 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1114
1115 return result;
70f08765
JB		 1116}
1117
572e0012
KV		 1118static ieee80211_rx_result debug_noinline
1119ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1120{
1121 struct ieee80211_local *local;
1122 struct ieee80211_hdr *hdr;
1123 struct sk_buff *skb;
1124
1125 local = rx->local;
1126 skb = rx->skb;
1127 hdr = (struct ieee80211_hdr *) skb->data;
1128
1129 if (!local->pspolling)
1130 return RX_CONTINUE;
1131
1132 if (!ieee80211_has_fromds(hdr->frame_control))
1133 /* this is not from AP */
1134 return RX_CONTINUE;
1135
1136 if (!ieee80211_is_data(hdr->frame_control))
1137 return RX_CONTINUE;
1138
1139 if (!ieee80211_has_moredata(hdr->frame_control)) {
1140 /* AP has no more frames buffered for us */
1141 local->pspolling = false;
1142 return RX_CONTINUE;
1143 }
1144
1145 /* more data bit is set, let's request a new frame from the AP */
1146 ieee80211_send_pspoll(local, rx->sdata);
1147
1148 return RX_CONTINUE;
1149}
1150
d012a605 1151static void sta_ps_start(struct sta_info *sta)
571ecf67 1152{
133b8226 1153 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1154 struct ieee80211_local *local = sdata->local;
d012a605 1155 struct ps_data *ps;
0795af57 1156
d012a605
MP		 1157 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1158 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1159 ps = &sdata->bss->ps;
1160 else
1161 return;
1162
1163 atomic_inc(&ps->num_sta_ps);
c2c98fde 1164 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1165 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1166 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1167 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1168 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1169}
1170
d012a605 1171static void sta_ps_end(struct sta_info *sta)
571ecf67 1172{
bdcbd8e0
JB		 1173 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1174 sta->sta.addr, sta->sta.aid);
004c872e 1175
c2c98fde 1176 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1177 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1178 sta->sta.addr, sta->sta.aid);
af818581
JB		 1179 return;
1180 }
1181
1182 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1183}
1184
d057e5a3
AN		 1185int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1186{
1187 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1188 bool in_ps;
1189
1190 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1191
1192 /* Don't let the same PS state be set twice */
c2c98fde 1193 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1194 if ((start && in_ps) || (!start && !in_ps))
1195 return -EINVAL;
1196
1197 if (start)
d012a605 1198 sta_ps_start(sta_inf);
d057e5a3 1199 else
d012a605 1200 sta_ps_end(sta_inf);
d057e5a3
AN		 1201
1202 return 0;
1203}
1204EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1205
47086fc5
JB		 1206static ieee80211_rx_result debug_noinline
1207ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1208{
1209 struct ieee80211_sub_if_data *sdata = rx->sdata;
1210 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1211 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1212 int tid, ac;
1213
1214 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1215 return RX_CONTINUE;
1216
1217 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1218 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1219 return RX_CONTINUE;
1220
1221 /*
1222 * The device handles station powersave, so don't do anything about
1223 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1224 * it to mac80211 since they're handled.)
1225 */
1226 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1227 return RX_CONTINUE;
1228
1229 /*
1230 * Don't do anything if the station isn't already asleep. In
1231 * the uAPSD case, the station will probably be marked asleep,
1232 * in the PS-Poll case the station must be confused ...
1233 */
c2c98fde 1234 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1235 return RX_CONTINUE;
1236
1237 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1238 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1239 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1240 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1241 else
c2c98fde 1242 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1243 }
47086fc5
JB		 1244
1245 /* Free PS Poll skb here instead of returning RX_DROP that would
1246 * count as an dropped frame. */
1247 dev_kfree_skb(rx->skb);
1248
1249 return RX_QUEUED;
1250 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1251 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1252 ieee80211_has_pm(hdr->frame_control) &&
1253 (ieee80211_is_data_qos(hdr->frame_control) ||
1254 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1255 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1256 ac = ieee802_1d_to_ac[tid & 7];
1257
1258 /*
1259 * If this AC is not trigger-enabled do nothing.
1260 *
1261 * NB: This could/should check a separate bitmap of trigger-
1262 * enabled queues, but for now we only implement uAPSD w/o
1263 * TSPEC changes to the ACs, so they're always the same.
1264 */
1265 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1266 return RX_CONTINUE;
1267
1268 /* if we are in a service period, do nothing */
c2c98fde 1269 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1270 return RX_CONTINUE;
1271
c2c98fde 1272 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1273 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1274 else
c2c98fde 1275 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1276 }
1277
1278 return RX_CONTINUE;
1279}
1280
49461622 1281static ieee80211_rx_result debug_noinline
5cf121c3 1282ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1283{
1284 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1285 struct sk_buff *skb = rx->skb;
1286 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1288
1289 if (!sta)
9ae54c84 1290 return RX_CONTINUE;
571ecf67 1291
b291ba11
JB		 1292 /*
1293 * Update last_rx only for IBSS packets which are for the current
1294 * BSSID to avoid keeping the current IBSS network alive in cases
1295 * where other STAs start using different BSSID.
1296 */
05c914fe 1297 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1298 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1299 NL80211_IFTYPE_ADHOC);
b203ca39 1300 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
571ecf67 1301 sta->last_rx = jiffies;
3af6334c
FF		 1302 if (ieee80211_is_data(hdr->frame_control)) {
1303 sta->last_rx_rate_idx = status->rate_idx;
1304 sta->last_rx_rate_flag = status->flag;
1305 }
1306 }
b291ba11
JB		 1307 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1308 /*
33b64eb2
LCC		 1309 * Mesh beacons will update last_rx when if they are found to
1310 * match the current local configuration when processed.
571ecf67 1311 */
b291ba11 1312 sta->last_rx = jiffies;
3af6334c
FF		 1313 if (ieee80211_is_data(hdr->frame_control)) {
1314 sta->last_rx_rate_idx = status->rate_idx;
1315 sta->last_rx_rate_flag = status->flag;
1316 }
571ecf67
JB		 1317 }
1318
554891e6 1319 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1320 return RX_CONTINUE;
571ecf67 1321
3cf335d5
KV		 1322 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1323 ieee80211_sta_rx_notify(rx->sdata, hdr);
1324
571ecf67
JB		 1325 sta->rx_fragments++;
1326 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1327 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1328 sta->last_signal = status->signal;
1329 ewma_add(&sta->avg_signal, -status->signal);
1330 }
571ecf67 1331
72eaa43a
JB		 1332 /*
1333 * Change STA power saving mode only at the end of a frame
1334 * exchange sequence.
1335 */
d057e5a3
AN		 1336 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1337 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1338 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1339 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1340 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1341 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1342 /*
1343 * Ignore doze->wake transitions that are
1344 * indicated by non-data frames, the standard
1345 * is unclear here, but for example going to
1346 * PS mode and then scanning would cause a
1347 * doze->wake transition for the probe request,
1348 * and that is clearly undesirable.
1349 */
1350 if (ieee80211_is_data(hdr->frame_control) &&
1351 !ieee80211_has_pm(hdr->frame_control))
d012a605 1352 sta_ps_end(sta);
72eaa43a
JB		 1353 } else {
1354 if (ieee80211_has_pm(hdr->frame_control))
d012a605 1355 sta_ps_start(sta);
72eaa43a 1356 }
571ecf67
JB		 1357 }
1358
22403def
JB		 1359 /*
1360 * Drop (qos-)data::nullfunc frames silently, since they
1361 * are used only to control station power saving mode.
1362 */
1363 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1364 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1365 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1366
1367 /*
1368 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1369 * that was not moved to a 4-addr STA vlan yet send
1370 * the event to userspace and for older hostapd drop
1371 * the frame to the monitor interface.
d524215f
FF		 1372 */
1373 if (ieee80211_has_a4(hdr->frame_control) &&
1374 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1375 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1376 !rx->sdata->u.vlan.sta))) {
1377 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1378 cfg80211_rx_unexpected_4addr_frame(
1379 rx->sdata->dev, sta->sta.addr,
1380 GFP_ATOMIC);
d524215f 1381 return RX_DROP_MONITOR;
e7f4a940 1382 }
22403def
JB		 1383 /*
1384 * Update counter and free packet here to avoid
1385 * counting this as a dropped packed.
1386 */
571ecf67
JB		 1387 sta->rx_packets++;
1388 dev_kfree_skb(rx->skb);
9ae54c84 1389 return RX_QUEUED;
571ecf67
JB		 1390 }
1391
9ae54c84 1392 return RX_CONTINUE;
571ecf67
JB		 1393} /* ieee80211_rx_h_sta_process */
1394
571ecf67
JB		 1395static inline struct ieee80211_fragment_entry *
1396ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1397 unsigned int frag, unsigned int seq, int rx_queue,
1398 struct sk_buff **skb)
1399{
1400 struct ieee80211_fragment_entry *entry;
571ecf67 1401
571ecf67
JB		 1402 entry = &sdata->fragments[sdata->fragment_next++];
1403 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1404 sdata->fragment_next = 0;
1405
bdcbd8e0 1406 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1407 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1408
1409 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1410 *skb = NULL;
1411 entry->first_frag_time = jiffies;
1412 entry->seq = seq;
1413 entry->rx_queue = rx_queue;
1414 entry->last_frag = frag;
1415 entry->ccmp = 0;
1416 entry->extra_len = 0;
1417
1418 return entry;
1419}
1420
1421static inline struct ieee80211_fragment_entry *
1422ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1423 unsigned int frag, unsigned int seq,
571ecf67
JB		 1424 int rx_queue, struct ieee80211_hdr *hdr)
1425{
1426 struct ieee80211_fragment_entry *entry;
1427 int i, idx;
1428
1429 idx = sdata->fragment_next;
1430 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1431 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1432
1433 idx--;
1434 if (idx < 0)
1435 idx = IEEE80211_FRAGMENT_MAX - 1;
1436
1437 entry = &sdata->fragments[idx];
1438 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1439 entry->rx_queue != rx_queue ||
1440 entry->last_frag + 1 != frag)
1441 continue;
1442
b73d70ad 1443 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1444
b73d70ad
HH		 1445 /*
1446 * Check ftype and addresses are equal, else check next fragment
1447 */
1448 if (((hdr->frame_control ^ f_hdr->frame_control) &
1449 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1450 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1451 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1452 continue;
1453
ab46623e 1454 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1455 __skb_queue_purge(&entry->skb_list);
1456 continue;
1457 }
1458 return entry;
1459 }
1460
1461 return NULL;
1462}
1463
49461622 1464static ieee80211_rx_result debug_noinline
5cf121c3 1465ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1466{
1467 struct ieee80211_hdr *hdr;
1468 u16 sc;
358c8d9d 1469 __le16 fc;
571ecf67
JB		 1470 unsigned int frag, seq;
1471 struct ieee80211_fragment_entry *entry;
1472 struct sk_buff *skb;
554891e6 1473 struct ieee80211_rx_status *status;
571ecf67 1474
b73d70ad 1475 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1476 fc = hdr->frame_control;
f7fbf70e
JC		 1477
1478 if (ieee80211_is_ctl(fc))
1479 return RX_CONTINUE;
1480
571ecf67
JB		 1481 sc = le16_to_cpu(hdr->seq_ctrl);
1482 frag = sc & IEEE80211_SCTL_FRAG;
1483
358c8d9d 1484 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1485 is_multicast_ether_addr(hdr->addr1))) {
1486 /* not fragmented */
1487 goto out;
1488 }
1489 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1490
e3cf8b3f
ZY		 1491 if (skb_linearize(rx->skb))
1492 return RX_DROP_UNUSABLE;
1493
058897a4
AK		 1494 /*
1495 * skb_linearize() might change the skb->data and
1496 * previously cached variables (in this case, hdr) need to
1497 * be refreshed with the new data.
1498 */
1499 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1500 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1501
1502 if (frag == 0) {
1503 /* This is the first fragment of a new frame. */
1504 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1505 rx->seqno_idx, &(rx->skb));
97359d12 1506 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1507 ieee80211_has_protected(fc)) {
9e26297a 1508 int queue = rx->security_idx;
571ecf67
JB		 1509 /* Store CCMP PN so that we can verify that the next
1510 * fragment has a sequential PN value. */
1511 entry->ccmp = 1;
1512 memcpy(entry->last_pn,
9190252c 1513 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1514 CCMP_PN_LEN);
1515 }
9ae54c84 1516 return RX_QUEUED;
571ecf67
JB		 1517 }
1518
1519 /* This is a fragment for a frame that should already be pending in
1520 * fragment cache. Add this fragment to the end of the pending entry.
1521 */
9e26297a
JB		 1522 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1523 rx->seqno_idx, hdr);
571ecf67
JB		 1524 if (!entry) {
1525 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1526 return RX_DROP_MONITOR;
571ecf67
JB		 1527 }
1528
1529 /* Verify that MPDUs within one MSDU have sequential PN values.
1530 * (IEEE 802.11i, 8.3.3.4.5) */
1531 if (entry->ccmp) {
1532 int i;
1533 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1534 int queue;
97359d12 1535 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1536 return RX_DROP_UNUSABLE;
571ecf67
JB		 1537 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1538 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1539 pn[i]++;
1540 if (pn[i])
1541 break;
1542 }
9e26297a 1543 queue = rx->security_idx;
9190252c 1544 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1545 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1546 return RX_DROP_UNUSABLE;
571ecf67
JB		 1547 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1548 }
1549
358c8d9d 1550 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1551 __skb_queue_tail(&entry->skb_list, rx->skb);
1552 entry->last_frag = frag;
1553 entry->extra_len += rx->skb->len;
358c8d9d 1554 if (ieee80211_has_morefrags(fc)) {
571ecf67 1555 rx->skb = NULL;
9ae54c84 1556 return RX_QUEUED;
571ecf67
JB		 1557 }
1558
1559 rx->skb = __skb_dequeue(&entry->skb_list);
1560 if (skb_tailroom(rx->skb) < entry->extra_len) {
1561 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1562 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1563 GFP_ATOMIC))) {
1564 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1565 __skb_queue_purge(&entry->skb_list);
e4c26add 1566 return RX_DROP_UNUSABLE;
571ecf67
JB		 1567 }
1568 }
1569 while ((skb = __skb_dequeue(&entry->skb_list))) {
1570 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1571 dev_kfree_skb(skb);
1572 }
1573
1574 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1575 status = IEEE80211_SKB_RXCB(rx->skb);
1576 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1577
1578 out:
1579 if (rx->sta)
1580 rx->sta->rx_packets++;
1581 if (is_multicast_ether_addr(hdr->addr1))
1582 rx->local->dot11MulticastReceivedFrameCount++;
1583 else
1584 ieee80211_led_rx(rx->local);
9ae54c84 1585 return RX_CONTINUE;
571ecf67
JB		 1586}
1587
1df332e8 1588static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1589{
1df332e8 1590 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1591 return -EACCES;
571ecf67 1592
76ee65bf 1593 return 0;
571ecf67
JB		 1594}
1595
1df332e8 1596static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1597{
eb9fb5b8
JB		 1598 struct sk_buff *skb = rx->skb;
1599 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1600
3017b80b 1601 /*
7848ba7d
JB		 1602 * Pass through unencrypted frames if the hardware has
1603 * decrypted them already.
3017b80b 1604 */
eb9fb5b8 1605 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1606 return 0;
571ecf67
JB		 1607
1608 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1609 if (unlikely(!ieee80211_has_protected(fc) &&
1610 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1611 ieee80211_is_data(fc) &&
b3fc9c6c 1612 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1613 return -EACCES;
bef5d1c7
JB		 1614
1615 return 0;
1616}
1617
1df332e8 1618static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
bef5d1c7
JB		 1619{
1620 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1621 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1622 __le16 fc = hdr->frame_control;
bef5d1c7 1623
e3efca0a
JM		 1624 /*
1625 * Pass through unencrypted frames if the hardware has
1626 * decrypted them already.
1627 */
1628 if (status->flag & RX_FLAG_DECRYPTED)
1629 return 0;
bef5d1c7 1630
c2c98fde 1631 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1632 if (unlikely(!ieee80211_has_protected(fc) &&
1633 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1634 rx->key)) {
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 1645 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1646 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1647 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1648 if (ieee80211_is_deauth(fc))
1649 cfg80211_send_unprot_deauth(rx->sdata->dev,
1650 rx->skb->data,
1651 rx->skb->len);
1652 else if (ieee80211_is_disassoc(fc))
1653 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1654 rx->skb->data,
1655 rx->skb->len);
f2ca3ea4 1656 return -EACCES;
cf4e594e 1657 }
f2ca3ea4
JM		 1658 /*
1659 * When using MFP, Action frames are not allowed prior to
1660 * having configured keys.
1661 */
1662 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1663 ieee80211_is_robust_mgmt_frame(
1664 (struct ieee80211_hdr *) rx->skb->data)))
1665 return -EACCES;
1666 }
b3fc9c6c 1667
76ee65bf 1668 return 0;
571ecf67
JB		 1669}
1670
76ee65bf 1671static int
4114fa21 1672__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1673{
eb9fb5b8 1674 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1675 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1676 bool check_port_control = false;
1677 struct ethhdr *ehdr;
1678 int ret;
f14543ee 1679
4114fa21 1680 *port_control = false;
9bc383de
JB		 1681 if (ieee80211_has_a4(hdr->frame_control) &&
1682 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1683 return -1;
9bc383de 1684
fbb327c5
FF		 1685 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1686 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1687
1688 if (!sdata->u.mgd.use_4addr)
1689 return -1;
1690 else
1691 check_port_control = true;
1692 }
1693
9bc383de 1694 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1695 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1696 return -1;
571ecf67 1697
fbb327c5 1698 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1699 if (ret < 0)
fbb327c5
FF		 1700 return ret;
1701
1702 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1703 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1704 *port_control = true;
1705 else if (check_port_control)
fbb327c5
FF		 1706 return -1;
1707
1708 return 0;
76ee65bf 1709}
571ecf67 1710
ce3edf6d
JB		 1711/*
1712 * requires that rx->skb is a frame with ethernet header
1713 */
358c8d9d 1714static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1715{
c97c23e3 1716 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1717 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1718 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1719
1720 /*
1721 * Allow EAPOL frames to us/the PAE group address regardless
1722 * of whether the frame was encrypted or not.
1723 */
a621fa4d 1724 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1725 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1726 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1727 return true;
1728
1729 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1730 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1731 return false;
1732
1733 return true;
1734}
1735
1736/*
1737 * requires that rx->skb is a frame with ethernet header
1738 */
76ee65bf 1739static void
5cf121c3 1740ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1741{
eb9fb5b8
JB		 1742 struct ieee80211_sub_if_data *sdata = rx->sdata;
1743 struct net_device *dev = sdata->dev;
76ee65bf 1744 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1745 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1746 struct sta_info *dsta;
554891e6 1747 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1748
76ee65bf
RR		 1749 skb = rx->skb;
1750 xmit_skb = NULL;
571ecf67 1751
05c914fe
JB		 1752 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1753 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1754 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1755 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1756 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1757 if (is_multicast_ether_addr(ehdr->h_dest)) {
1758 /*
1759 * send multicast frames both to higher layers in
1760 * local net stack and back to the wireless medium
1761 */
76ee65bf 1762 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1763 if (!xmit_skb)
bdcbd8e0 1764 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1765 dev->name);
571ecf67 1766 } else {
abe60632
JB		 1767 dsta = sta_info_get(sdata, skb->data);
1768 if (dsta) {
ce3edf6d
JB		 1769 /*
1770 * The destination station is associated to
1771 * this AP (in this VLAN), so send the frame
1772 * directly to it and do not pass it to local
1773 * net stack.
571ecf67 1774 */
76ee65bf 1775 xmit_skb = skb;
571ecf67
JB		 1776 skb = NULL;
1777 }
571ecf67
JB		 1778 }
1779 }
1780
1781 if (skb) {
d1c3a37c
JB		 1782 int align __maybe_unused;
1783
59d9cb07 1784#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1785 /*
1786 * 'align' will only take the values 0 or 2 here
1787 * since all frames are required to be aligned
1788 * to 2-byte boundaries when being passed to
1789 * mac80211. That also explains the __skb_push()
1790 * below.
1791 */
dacb6f1d 1792 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1793 if (align) {
1794 if (WARN_ON(skb_headroom(skb) < 3)) {
1795 dev_kfree_skb(skb);
1796 skb = NULL;
1797 } else {
1798 u8 *data = skb->data;
8ce0b589
ZY		 1799 size_t len = skb_headlen(skb);
1800 skb->data -= align;
1801 memmove(skb->data, data, len);
1802 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1803 }
1804 }
1805#endif
1806
1807 if (skb) {
1808 /* deliver to local stack */
1809 skb->protocol = eth_type_trans(skb, dev);
1810 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1811 netif_receive_skb(skb);
d1c3a37c 1812 }
571ecf67
JB		 1813 }
1814
76ee65bf 1815 if (xmit_skb) {
aef6c928
HS		 1816 /*
1817 * Send to wireless media and increase priority by 256 to
1818 * keep the received priority instead of reclassifying
1819 * the frame (see cfg80211_classify8021d).
1820 */
1821 xmit_skb->priority += 256;
f831e909 1822 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1823 skb_reset_network_header(xmit_skb);
1824 skb_reset_mac_header(xmit_skb);
76ee65bf 1825 dev_queue_xmit(xmit_skb);
571ecf67 1826 }
76ee65bf
RR		 1827}
1828
49461622 1829static ieee80211_rx_result debug_noinline
5cf121c3 1830ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1831{
eb9fb5b8 1832 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1833 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1834 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1835 __le16 fc = hdr->frame_control;
eaf85ca7 1836 struct sk_buff_head frame_list;
554891e6 1837 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1838
358c8d9d 1839 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1840 return RX_CONTINUE;
fd4c7f2f 1841
358c8d9d 1842 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1843 return RX_DROP_MONITOR;
fd4c7f2f 1844
554891e6 1845 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1846 return RX_CONTINUE;
fd4c7f2f 1847
eaf85ca7
ZY		 1848 if (ieee80211_has_a4(hdr->frame_control) &&
1849 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1850 !rx->sdata->u.vlan.sta)
e4c26add 1851 return RX_DROP_UNUSABLE;
fd4c7f2f 1852
eaf85ca7
ZY		 1853 if (is_multicast_ether_addr(hdr->addr1) &&
1854 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1855 rx->sdata->u.vlan.sta) ||
1856 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1857 rx->sdata->u.mgd.use_4addr)))
e4c26add 1858 return RX_DROP_UNUSABLE;
fd4c7f2f 1859
eaf85ca7
ZY		 1860 skb->dev = dev;
1861 __skb_queue_head_init(&frame_list);
fd4c7f2f 1862
e3cf8b3f
ZY		 1863 if (skb_linearize(skb))
1864 return RX_DROP_UNUSABLE;
1865
eaf85ca7
ZY		 1866 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1867 rx->sdata->vif.type,
8b3becad 1868 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1869
eaf85ca7
ZY		 1870 while (!skb_queue_empty(&frame_list)) {
1871 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1872
358c8d9d 1873 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1874 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1875 continue;
1876 }
eaf85ca7
ZY		 1877 dev->stats.rx_packets++;
1878 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1879
1880 ieee80211_deliver_skb(rx);
1881 }
1882
9ae54c84 1883 return RX_QUEUED;
fd4c7f2f
RR		 1884}
1885
bf94e17b 1886#ifdef CONFIG_MAC80211_MESH
b0dee578 1887static ieee80211_rx_result
e32f85f7
LCC		 1888ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1889{
30789eb6
TP		 1890 struct ieee80211_hdr *fwd_hdr, *hdr;
1891 struct ieee80211_tx_info *info;
e32f85f7 1892 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1893 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1894 struct ieee80211_local *local = rx->local;
eb9fb5b8 1895 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1896 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1897 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1898 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1899 u16 q, hdrlen;
e32f85f7
LCC		 1900
1901 hdr = (struct ieee80211_hdr *) skb->data;
1902 hdrlen = ieee80211_hdrlen(hdr->frame_control);
9b395bc3
JB		 1903
1904 /* make sure fixed part of mesh header is there, also checks skb len */
1905 if (!pskb_may_pull(rx->skb, hdrlen + 6))
1906 return RX_DROP_MONITOR;
1907
1908 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1909
1910 /* make sure full mesh header is there, also checks skb len */
1911 if (!pskb_may_pull(rx->skb,
1912 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
1913 return RX_DROP_MONITOR;
1914
1915 /* reload pointers */
1916 hdr = (struct ieee80211_hdr *) skb->data;
e32f85f7
LCC		 1917 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1918
2157fdd6
TP		 1919 /* frame is in RMC, don't forward */
1920 if (ieee80211_is_data(hdr->frame_control) &&
1921 is_multicast_ether_addr(hdr->addr1) &&
1922 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1923 return RX_DROP_MONITOR;
1924
555cb715
JC		 1925 if (!ieee80211_is_data(hdr->frame_control) ||
1926 !(status->rx_flags & IEEE80211_RX_RA_MATCH))
e32f85f7
LCC		 1927 return RX_CONTINUE;
1928
1929 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1930 return RX_DROP_MONITOR;
1931
43b7b314 1932 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1933 struct mesh_path *mppath;
43b7b314
JC		 1934 char *proxied_addr;
1935 char *mpp_addr;
1936
1937 if (is_multicast_ether_addr(hdr->addr1)) {
1938 mpp_addr = hdr->addr3;
1939 proxied_addr = mesh_hdr->eaddr1;
9b395bc3
JB		 1940 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
1941 /* has_a4 already checked in ieee80211_rx_mesh_check */
43b7b314
JC		 1942 mpp_addr = hdr->addr4;
1943 proxied_addr = mesh_hdr->eaddr2;
9b395bc3
JB		 1944 } else {
1945 return RX_DROP_MONITOR;
43b7b314 1946 }
79617dee 1947
79617dee 1948 rcu_read_lock();
43b7b314 1949 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1950 if (!mppath) {
43b7b314 1951 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1952 } else {
1953 spin_lock_bh(&mppath->state_lock);
b203ca39 1954 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 1955 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1956 spin_unlock_bh(&mppath->state_lock);
1957 }
1958 rcu_read_unlock();
1959 }
1960
3c5772a5
JC		 1961 /* Frame has reached destination. Don't forward */
1962 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 1963 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 1964 return RX_CONTINUE;
1965
00e96dec 1966 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 1967 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1968 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1969 return RX_DROP_MONITOR;
1970 }
1971 skb_set_queue_mapping(skb, q);
e32f85f7 1972
30789eb6
TP		 1973 if (!--mesh_hdr->ttl) {
1974 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
2ac64cd1 1975 goto out;
30789eb6
TP		 1976 }
1977
d665508b
CYY		 1978 if (!ifmsh->mshcfg.dot11MeshForwarding)
1979 goto out;
1980
30789eb6
TP		 1981 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1982 if (!fwd_skb) {
bdcbd8e0 1983 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 1984 sdata->name);
30789eb6
TP		 1985 goto out;
1986 }
1987
1988 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1989 info = IEEE80211_SKB_CB(fwd_skb);
1990 memset(info, 0, sizeof(*info));
1991 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1992 info->control.vif = &rx->sdata->vif;
1993 info->control.jiffies = jiffies;
1994 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1995 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1996 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1997 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1998 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1999 } else {
2000 /* unable to resolve next hop */
2001 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1df332e8 2002 0, reason, fwd_hdr->addr2, sdata);
30789eb6 2003 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 2004 kfree_skb(fwd_skb);
30789eb6 2005 return RX_DROP_MONITOR;
e32f85f7
LCC		 2006 }
2007
30789eb6
TP		 2008 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2009 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2010 out:
3c5772a5 2011 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2012 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2013 return RX_CONTINUE;
2014 else
2015 return RX_DROP_MONITOR;
2016}
bf94e17b 2017#endif
e32f85f7 2018
49461622 2019static ieee80211_rx_result debug_noinline
5cf121c3 2020ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2021{
eb9fb5b8 2022 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2023 struct ieee80211_local *local = rx->local;
eb9fb5b8 2024 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2026 __le16 fc = hdr->frame_control;
4114fa21 2027 bool port_control;
ce3edf6d 2028 int err;
76ee65bf 2029
358c8d9d 2030 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2031 return RX_CONTINUE;
76ee65bf 2032
358c8d9d 2033 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2034 return RX_DROP_MONITOR;
76ee65bf 2035
f14543ee 2036 /*
e7f4a940
JB		 2037 * Send unexpected-4addr-frame event to hostapd. For older versions,
2038 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2039 */
2040 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2041 sdata->vif.type == NL80211_IFTYPE_AP) {
2042 if (rx->sta &&
2043 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2044 cfg80211_rx_unexpected_4addr_frame(
2045 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2046 return RX_DROP_MONITOR;
e7f4a940 2047 }
f14543ee 2048
4114fa21 2049 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2050 if (unlikely(err))
e4c26add 2051 return RX_DROP_UNUSABLE;
76ee65bf 2052
358c8d9d 2053 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2054 return RX_DROP_MONITOR;
ce3edf6d 2055
4114fa21
FF		 2056 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2057 unlikely(port_control) && sdata->bss) {
2058 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2059 u.ap);
2060 dev = sdata->dev;
2061 rx->sdata = sdata;
2062 }
2063
76ee65bf
RR		 2064 rx->skb->dev = dev;
2065
2066 dev->stats.rx_packets++;
2067 dev->stats.rx_bytes += rx->skb->len;
2068
08ca944e 2069 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2070 !is_multicast_ether_addr(
2071 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2072 (!local->scanning &&
2073 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2074 mod_timer(&local->dynamic_ps_timer, jiffies +
2075 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2076 }
2077
76ee65bf 2078 ieee80211_deliver_skb(rx);
571ecf67 2079
9ae54c84 2080 return RX_QUEUED;
571ecf67
JB		 2081}
2082
49461622 2083static ieee80211_rx_result debug_noinline
24a8fdad 2084ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2085{
71364716 2086 struct sk_buff *skb = rx->skb;
a7767f95 2087 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2088 struct tid_ampdu_rx *tid_agg_rx;
2089 u16 start_seq_num;
2090 u16 tid;
2091
a7767f95 2092 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2093 return RX_CONTINUE;
71364716 2094
a7767f95 2095 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2096 struct {
2097 __le16 control, start_seq_num;
2098 } __packed bar_data;
2099
71364716 2100 if (!rx->sta)
a02ae758 2101 return RX_DROP_MONITOR;
8ae5977f
JB		 2102
2103 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2104 &bar_data, sizeof(bar_data)))
2105 return RX_DROP_MONITOR;
2106
8ae5977f 2107 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2108
2109 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2110 if (!tid_agg_rx)
a02ae758 2111 return RX_DROP_MONITOR;
71364716 2112
8ae5977f 2113 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2114
2115 /* reset session timer */
20ad19d0
JB		 2116 if (tid_agg_rx->timeout)
2117 mod_timer(&tid_agg_rx->session_timer,
2118 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2119
dd318575 2120 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2121 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2122 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2123 start_seq_num);
dd318575
JB		 2124 spin_unlock(&tid_agg_rx->reorder_lock);
2125
a02ae758
JB		 2126 kfree_skb(skb);
2127 return RX_QUEUED;
71364716
RR		 2128 }
2129
08daecae
JB		 2130 /*
2131 * After this point, we only want management frames,
2132 * so we can drop all remaining control frames to
2133 * cooked monitor interfaces.
2134 */
2135 return RX_DROP_MONITOR;
71364716
RR		 2136}
2137
f4f727a6
JM		 2138static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2139 struct ieee80211_mgmt *mgmt,
2140 size_t len)
fea14732
JM		 2141{
2142 struct ieee80211_local *local = sdata->local;
2143 struct sk_buff *skb;
2144 struct ieee80211_mgmt *resp;
2145
b203ca39 2146 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2147 /* Not to own unicast address */
2148 return;
2149 }
2150
b203ca39
JP		 2151 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2152 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2153 /* Not from the current AP or not associated yet. */
fea14732
JM		 2154 return;
2155 }
2156
2157 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2158 /* Too short SA Query request frame */
2159 return;
2160 }
2161
2162 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2163 if (skb == NULL)
2164 return;
2165
2166 skb_reserve(skb, local->hw.extra_tx_headroom);
2167 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2168 memset(resp, 0, 24);
2169 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2170 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2171 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2172 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2173 IEEE80211_STYPE_ACTION);
2174 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2175 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2176 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2177 memcpy(resp->u.action.u.sa_query.trans_id,
2178 mgmt->u.action.u.sa_query.trans_id,
2179 WLAN_SA_QUERY_TR_ID_LEN);
2180
62ae67be 2181 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2182}
2183
2e161f78
JB		 2184static ieee80211_rx_result debug_noinline
2185ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2186{
2187 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2188 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2189
2190 /*
2191 * From here on, look only at management frames.
2192 * Data and control frames are already handled,
2193 * and unknown (reserved) frames are useless.
2194 */
2195 if (rx->skb->len < 24)
2196 return RX_DROP_MONITOR;
2197
2198 if (!ieee80211_is_mgmt(mgmt->frame_control))
2199 return RX_DROP_MONITOR;
2200
ee971924
JB		 2201 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2202 ieee80211_is_beacon(mgmt->frame_control) &&
2203 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2204 int sig = 0;
2205
2206 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2207 sig = status->signal;
2208
ee971924
JB		 2209 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2210 rx->skb->data, rx->skb->len,
37c73b5f 2211 status->freq, sig);
ee971924
JB		 2212 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2213 }
2214
554891e6 2215 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2216 return RX_DROP_MONITOR;
2217
2218 if (ieee80211_drop_unencrypted_mgmt(rx))
2219 return RX_DROP_UNUSABLE;
2220
2221 return RX_CONTINUE;
2222}
2223
de1ede7a
JB		 2224static ieee80211_rx_result debug_noinline
2225ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2226{
2227 struct ieee80211_local *local = rx->local;
eb9fb5b8 2228 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2229 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2230 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2231 int len = rx->skb->len;
2232
2233 if (!ieee80211_is_action(mgmt->frame_control))
2234 return RX_CONTINUE;
2235
026331c4
JM		 2236 /* drop too small frames */
2237 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2238 return RX_DROP_UNUSABLE;
de1ede7a 2239
026331c4 2240 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2241 return RX_DROP_UNUSABLE;
de1ede7a 2242
554891e6 2243 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2244 return RX_DROP_UNUSABLE;
97ebe12a 2245
de1ede7a 2246 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2247 case WLAN_CATEGORY_HT:
2248 /* reject HT action frames from stations not supporting HT */
2249 if (!rx->sta->sta.ht_cap.ht_supported)
2250 goto invalid;
2251
2252 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2253 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2254 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2255 sdata->vif.type != NL80211_IFTYPE_AP &&
2256 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2257 break;
2258
2259 /* verify action & smps_control are present */
2260 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2261 goto invalid;
2262
2263 switch (mgmt->u.action.u.ht_smps.action) {
2264 case WLAN_HT_ACTION_SMPS: {
2265 struct ieee80211_supported_band *sband;
2266 u8 smps;
2267
2268 /* convert to HT capability */
2269 switch (mgmt->u.action.u.ht_smps.smps_control) {
2270 case WLAN_HT_SMPS_CONTROL_DISABLED:
2271 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2272 break;
2273 case WLAN_HT_SMPS_CONTROL_STATIC:
2274 smps = WLAN_HT_CAP_SM_PS_STATIC;
2275 break;
2276 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2277 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2278 break;
2279 default:
2280 goto invalid;
2281 }
2282 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2283
2284 /* if no change do nothing */
2285 if ((rx->sta->sta.ht_cap.cap &
2286 IEEE80211_HT_CAP_SM_PS) == smps)
2287 goto handled;
2288
2289 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2290 rx->sta->sta.ht_cap.cap |= smps;
2291
2292 sband = rx->local->hw.wiphy->bands[status->band];
2293
64f68e5d
JB		 2294 rate_control_rate_update(local, sband, rx->sta,
2295 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2296 goto handled;
2297 }
2298 default:
2299 goto invalid;
2300 }
2301
2302 break;
de1ede7a 2303 case WLAN_CATEGORY_BACK:
8abd3f9b 2304 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2305 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2306 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2307 sdata->vif.type != NL80211_IFTYPE_AP &&
2308 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2309 break;
8abd3f9b 2310
026331c4
JM		 2311 /* verify action_code is present */
2312 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2313 break;
2314
de1ede7a
JB		 2315 switch (mgmt->u.action.u.addba_req.action_code) {
2316 case WLAN_ACTION_ADDBA_REQ:
2317 if (len < (IEEE80211_MIN_ACTION_SIZE +
2318 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2319 goto invalid;
2320 break;
de1ede7a
JB		 2321 case WLAN_ACTION_ADDBA_RESP:
2322 if (len < (IEEE80211_MIN_ACTION_SIZE +
2323 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2324 goto invalid;
2325 break;
de1ede7a
JB		 2326 case WLAN_ACTION_DELBA:
2327 if (len < (IEEE80211_MIN_ACTION_SIZE +
2328 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2329 goto invalid;
2330 break;
2331 default:
2332 goto invalid;
de1ede7a 2333 }
bed7ee6e 2334
8b58ff83 2335 goto queue;
39192c0b 2336 case WLAN_CATEGORY_SPECTRUM_MGMT:
4797c7ba 2337 if (status->band != IEEE80211_BAND_5GHZ)
84040805 2338 break;
46900298
JB		 2339
2340 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2341 break;
46900298 2342
026331c4
JM		 2343 /* verify action_code is present */
2344 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2345 break;
2346
39192c0b
JB		 2347 switch (mgmt->u.action.u.measurement.action_code) {
2348 case WLAN_ACTION_SPCT_MSR_REQ:
2349 if (len < (IEEE80211_MIN_ACTION_SIZE +
2350 sizeof(mgmt->u.action.u.measurement)))
84040805 2351 break;
39192c0b 2352 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2353 goto handled;
c481ec97
S		 2354 case WLAN_ACTION_SPCT_CHL_SWITCH:
2355 if (len < (IEEE80211_MIN_ACTION_SIZE +
2356 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2357 break;
c481ec97 2358
cc32abd4 2359 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2360 break;
cc32abd4 2361
b203ca39 2362 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2363 break;
c481ec97 2364
8b58ff83 2365 goto queue;
39192c0b
JB		 2366 }
2367 break;
fea14732
JM		 2368 case WLAN_CATEGORY_SA_QUERY:
2369 if (len < (IEEE80211_MIN_ACTION_SIZE +
2370 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2371 break;
2372
fea14732
JM		 2373 switch (mgmt->u.action.u.sa_query.action) {
2374 case WLAN_ACTION_SA_QUERY_REQUEST:
2375 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2376 break;
fea14732 2377 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2378 goto handled;
fea14732
JM		 2379 }
2380 break;
8db09850 2381 case WLAN_CATEGORY_SELF_PROTECTED:
9b395bc3
JB		 2382 if (len < (IEEE80211_MIN_ACTION_SIZE +
2383 sizeof(mgmt->u.action.u.self_prot.action_code)))
2384 break;
2385
8db09850
TP		 2386 switch (mgmt->u.action.u.self_prot.action_code) {
2387 case WLAN_SP_MESH_PEERING_OPEN:
2388 case WLAN_SP_MESH_PEERING_CLOSE:
2389 case WLAN_SP_MESH_PEERING_CONFIRM:
2390 if (!ieee80211_vif_is_mesh(&sdata->vif))
2391 goto invalid;
2392 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2393 /* userspace handles this frame */
2394 break;
2395 goto queue;
2396 case WLAN_SP_MGK_INFORM:
2397 case WLAN_SP_MGK_ACK:
2398 if (!ieee80211_vif_is_mesh(&sdata->vif))
2399 goto invalid;
2400 break;
2401 }
2402 break;
d3aaec8a 2403 case WLAN_CATEGORY_MESH_ACTION:
9b395bc3
JB		 2404 if (len < (IEEE80211_MIN_ACTION_SIZE +
2405 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2406 break;
2407
77a121c3
JB		 2408 if (!ieee80211_vif_is_mesh(&sdata->vif))
2409 break;
25d49e4d 2410 if (mesh_action_is_path_sel(mgmt) &&
1df332e8 2411 !mesh_path_sel_is_hwmp(sdata))
c7108a71
JC		 2412 break;
2413 goto queue;
84040805 2414 }
026331c4 2415
2e161f78
JB		 2416 return RX_CONTINUE;
2417
bed7ee6e 2418 invalid:
554891e6 2419 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2420 /* will return in the next handlers */
2421 return RX_CONTINUE;
2422
2423 handled:
2424 if (rx->sta)
2425 rx->sta->rx_packets++;
2426 dev_kfree_skb(rx->skb);
2427 return RX_QUEUED;
2428
2429 queue:
2430 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2431 skb_queue_tail(&sdata->skb_queue, rx->skb);
2432 ieee80211_queue_work(&local->hw, &sdata->work);
2433 if (rx->sta)
2434 rx->sta->rx_packets++;
2435 return RX_QUEUED;
2436}
2437
2438static ieee80211_rx_result debug_noinline
2439ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2440{
554891e6 2441 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2442 int sig = 0;
2e161f78
JB		 2443
2444 /* skip known-bad action frames and return them in the next handler */
554891e6 2445 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2446 return RX_CONTINUE;
d7907448 2447
026331c4
JM		 2448 /*
2449 * Getting here means the kernel doesn't know how to handle
2450 * it, but maybe userspace does ... include returned frames
2451 * so userspace can register for those to know whether ones
2452 * it transmitted were processed or returned.
2453 */
026331c4 2454
804483e9
JB		 2455 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2456 sig = status->signal;
2457
71bbc994 2458 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2459 rx->skb->data, rx->skb->len,
2460 GFP_ATOMIC)) {
2461 if (rx->sta)
2462 rx->sta->rx_packets++;
2463 dev_kfree_skb(rx->skb);
2464 return RX_QUEUED;
2465 }
2466
2e161f78
JB		 2467 return RX_CONTINUE;
2468}
2469
2470static ieee80211_rx_result debug_noinline
2471ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2472{
2473 struct ieee80211_local *local = rx->local;
2474 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2475 struct sk_buff *nskb;
2476 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2477 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2478
2479 if (!ieee80211_is_action(mgmt->frame_control))
2480 return RX_CONTINUE;
2481
2482 /*
2483 * For AP mode, hostapd is responsible for handling any action
2484 * frames that we didn't handle, including returning unknown
2485 * ones. For all other modes we will return them to the sender,
2486 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2487 * 802.11-2012 9.24.4.
2e161f78
JB		 2488 * Newer versions of hostapd shall also use the management frame
2489 * registration mechanisms, but older ones still use cooked
2490 * monitor interfaces so push all frames there.
2491 */
554891e6 2492 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2493 (sdata->vif.type == NL80211_IFTYPE_AP ||
2494 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2495 return RX_DROP_MONITOR;
026331c4 2496
4b5ebccc
JB		 2497 if (is_multicast_ether_addr(mgmt->da))
2498 return RX_DROP_MONITOR;
2499
84040805
JB		 2500 /* do not return rejected action frames */
2501 if (mgmt->u.action.category & 0x80)
2502 return RX_DROP_UNUSABLE;
2503
2504 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2505 GFP_ATOMIC);
2506 if (nskb) {
292b4df6 2507 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2508
292b4df6
JL		 2509 nmgmt->u.action.category |= 0x80;
2510 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2511 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2512
2513 memset(nskb->cb, 0, sizeof(nskb->cb));
2514
2515 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2516 }
39192c0b
JB		 2517 dev_kfree_skb(rx->skb);
2518 return RX_QUEUED;
de1ede7a
JB		 2519}
2520
49461622 2521static ieee80211_rx_result debug_noinline
5cf121c3 2522ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2523{
eb9fb5b8 2524 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2525 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2526 __le16 stype;
571ecf67 2527
77a121c3 2528 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2529
77a121c3
JB		 2530 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2531 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2532 sdata->vif.type != NL80211_IFTYPE_STATION)
2533 return RX_DROP_MONITOR;
472dbc45 2534
77a121c3 2535 switch (stype) {
66e67e41 2536 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2537 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2538 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2539 /* process for all: mesh, mlme, ibss */
2540 break;
66e67e41
JB		 2541 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2542 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2543 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2544 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2545 if (is_multicast_ether_addr(mgmt->da) &&
2546 !is_broadcast_ether_addr(mgmt->da))
2547 return RX_DROP_MONITOR;
2548
77a121c3
JB		 2549 /* process only for station */
2550 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2551 return RX_DROP_MONITOR;
2552 break;
2553 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2554 /* process only for ibss */
2555 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2556 return RX_DROP_MONITOR;
2557 break;
2558 default:
2559 return RX_DROP_MONITOR;
2560 }
f9d540ee 2561
77a121c3 2562 /* queue up frame and kick off work to process it */
c1475ca9 2563 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2564 skb_queue_tail(&sdata->skb_queue, rx->skb);
2565 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2566 if (rx->sta)
2567 rx->sta->rx_packets++;
46900298 2568
77a121c3 2569 return RX_QUEUED;
571ecf67
JB		 2570}
2571
5cf121c3 2572/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2573static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2574 struct ieee80211_rate *rate)
3d30d949
MW		 2575{
2576 struct ieee80211_sub_if_data *sdata;
2577 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2578 struct sk_buff *skb = rx->skb, *skb2;
2579 struct net_device *prev_dev = NULL;
eb9fb5b8 2580 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2581 int needed_headroom;
3d30d949 2582
554891e6
JB		 2583 /*
2584 * If cooked monitor has been processed already, then
2585 * don't do it again. If not, set the flag.
2586 */
2587 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2588 goto out_free_skb;
554891e6 2589 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2590
152c477a
JB		 2591 /* If there are no cooked monitor interfaces, just free the SKB */
2592 if (!local->cooked_mntrs)
2593 goto out_free_skb;
2594
293702a3
JB		 2595 /* room for the radiotap header based on driver features */
2596 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2597
293702a3
JB		 2598 if (skb_headroom(skb) < needed_headroom &&
2599 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2600 goto out_free_skb;
3d30d949 2601
293702a3 2602 /* prepend radiotap information */
973ef21a
FF		 2603 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2604 false);
3d30d949
MW		 2605
2606 skb_set_mac_header(skb, 0);
2607 skb->ip_summed = CHECKSUM_UNNECESSARY;
2608 skb->pkt_type = PACKET_OTHERHOST;
2609 skb->protocol = htons(ETH_P_802_2);
2610
2611 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2612 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2613 continue;
2614
05c914fe 2615 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2616 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2617 continue;
2618
2619 if (prev_dev) {
2620 skb2 = skb_clone(skb, GFP_ATOMIC);
2621 if (skb2) {
2622 skb2->dev = prev_dev;
5548a8a1 2623 netif_receive_skb(skb2);
3d30d949
MW		 2624 }
2625 }
2626
2627 prev_dev = sdata->dev;
2628 sdata->dev->stats.rx_packets++;
2629 sdata->dev->stats.rx_bytes += skb->len;
2630 }
2631
2632 if (prev_dev) {
2633 skb->dev = prev_dev;
5548a8a1 2634 netif_receive_skb(skb);
554891e6
JB		 2635 return;
2636 }
3d30d949
MW		 2637
2638 out_free_skb:
2639 dev_kfree_skb(skb);
2640}
2641
aa0c8636
CL		 2642static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2643 ieee80211_rx_result res)
2644{
2645 switch (res) {
2646 case RX_DROP_MONITOR:
2647 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2648 if (rx->sta)
2649 rx->sta->rx_dropped++;
2650 /* fall through */
2651 case RX_CONTINUE: {
2652 struct ieee80211_rate *rate = NULL;
2653 struct ieee80211_supported_band *sband;
2654 struct ieee80211_rx_status *status;
2655
2656 status = IEEE80211_SKB_RXCB((rx->skb));
2657
2658 sband = rx->local->hw.wiphy->bands[status->band];
2659 if (!(status->flag & RX_FLAG_HT))
2660 rate = &sband->bitrates[status->rate_idx];
2661
2662 ieee80211_rx_cooked_monitor(rx, rate);
2663 break;
2664 }
2665 case RX_DROP_UNUSABLE:
2666 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2667 if (rx->sta)
2668 rx->sta->rx_dropped++;
2669 dev_kfree_skb(rx->skb);
2670 break;
2671 case RX_QUEUED:
2672 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2673 break;
2674 }
2675}
571ecf67 2676
24a8fdad 2677static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2678{
58905290 2679 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2680 struct sk_buff *skb;
8944b79f 2681
e32f85f7
LCC		 2682#define CALL_RXH(rxh) \
2683 do { \
2684 res = rxh(rx); \
2685 if (res != RX_CONTINUE) \
2569a826 2686 goto rxh_next; \
e32f85f7 2687 } while (0);
49461622 2688
24a8fdad
CL		 2689 spin_lock(&rx->local->rx_skb_queue.lock);
2690 if (rx->local->running_rx_handler)
2691 goto unlock;
2692
2693 rx->local->running_rx_handler = true;
2694
2695 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2696 spin_unlock(&rx->local->rx_skb_queue.lock);
2697
2569a826
JB		 2698 /*
2699 * all the other fields are valid across frames
2700 * that belong to an aMPDU since they are on the
2701 * same TID from the same station
2702 */
2703 rx->skb = skb;
2704
2705 CALL_RXH(ieee80211_rx_h_decrypt)
2706 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2707 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2708 CALL_RXH(ieee80211_rx_h_sta_process)
2709 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2710 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2711 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2712#ifdef CONFIG_MAC80211_MESH
aa0c8636 2713 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2714 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2715#endif
2154c81c 2716 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2717 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2718 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2719 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2720 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2721 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2722 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2723 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2724
aa0c8636
CL		 2725 rxh_next:
2726 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2727 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2728#undef CALL_RXH
aa0c8636 2729 }
24a8fdad
CL		 2730
2731 rx->local->running_rx_handler = false;
2732
2733 unlock:
2734 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2735}
2736
4406c376 2737static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2738{
aa0c8636
CL		 2739 ieee80211_rx_result res = RX_DROP_MONITOR;
2740
aa0c8636
CL		 2741#define CALL_RXH(rxh) \
2742 do { \
2743 res = rxh(rx); \
2744 if (res != RX_CONTINUE) \
2745 goto rxh_next; \
2746 } while (0);
2747
aa0c8636
CL		 2748 CALL_RXH(ieee80211_rx_h_check)
2749
24a8fdad 2750 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2751
24a8fdad 2752 ieee80211_rx_handlers(rx);
aa0c8636 2753 return;
49461622 2754
2569a826 2755 rxh_next:
aa0c8636
CL		 2756 ieee80211_rx_handlers_result(rx, res);
2757
2758#undef CALL_RXH
58905290
JB		 2759}
2760
2bff8ebf 2761/*
dd318575
JB		 2762 * This function makes calls into the RX path, therefore
2763 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2764 */
2765void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2766{
554891e6
JB		 2767 struct ieee80211_rx_data rx = {
2768 .sta = sta,
2769 .sdata = sta->sdata,
2770 .local = sta->local,
9e26297a
JB		 2771 /* This is OK -- must be QoS data frame */
2772 .security_idx = tid,
2773 .seqno_idx = tid,
fcf8bd3b 2774 .flags = 0,
554891e6 2775 };
2c15a0cf
CL		 2776 struct tid_ampdu_rx *tid_agg_rx;
2777
2778 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2779 if (!tid_agg_rx)
2780 return;
2bff8ebf 2781
2c15a0cf 2782 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2783 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2784 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2785
24a8fdad 2786 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2787}
2788
571ecf67
JB		 2789/* main receive path */
2790
20b01f80 2791static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2792 struct ieee80211_hdr *hdr)
2793{
20b01f80 2794 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2795 struct sk_buff *skb = rx->skb;
2796 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2797 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2798 int multicast = is_multicast_ether_addr(hdr->addr1);
2799
51fb61e7 2800 switch (sdata->vif.type) {
05c914fe 2801 case NL80211_IFTYPE_STATION:
9bc383de 2802 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2803 return 0;
77fdaa12 2804 if (!multicast &&
b203ca39 2805 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2806 if (!(sdata->dev->flags & IFF_PROMISC) ||
2807 sdata->u.mgd.use_4addr)
23a24def 2808 return 0;
554891e6 2809 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2810 }
2811 break;
05c914fe 2812 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2813 if (!bssid)
2814 return 0;
a7767f95 2815 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2816 return 1;
d48b2968
JB		 2817 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2818 return 0;
23a24def 2819 } else if (!multicast &&
b203ca39 2820 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2821 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2822 return 0;
554891e6 2823 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2824 } else if (!rx->sta) {
2825 int rate_idx;
eb9fb5b8 2826 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2827 rate_idx = 0; /* TODO: HT rates */
2828 else
eb9fb5b8 2829 rate_idx = status->rate_idx;
8bf11d8d
JB		 2830 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2831 BIT(rate_idx));
0fb8ca45 2832 }
23a24def 2833 break;
05c914fe 2834 case NL80211_IFTYPE_MESH_POINT:
6032f934 2835 if (!multicast &&
b203ca39 2836 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2837 if (!(sdata->dev->flags & IFF_PROMISC))
2838 return 0;
2839
554891e6 2840 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2841 }
2842 break;
05c914fe
JB		 2843 case NL80211_IFTYPE_AP_VLAN:
2844 case NL80211_IFTYPE_AP:
23a24def 2845 if (!bssid) {
b203ca39 2846 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def 2847 return 0;
f142c6b9 2848 } else if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
3df6eaea
JB		 2849 /*
2850 * Accept public action frames even when the
2851 * BSSID doesn't match, this is used for P2P
2852 * and location updates. Note that mac80211
2853 * itself never looks at these frames.
2854 */
d48b2968 2855 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2856 return 1;
d48b2968 2857 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2858 return 0;
554891e6 2859 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2860 }
23a24def 2861 break;
05c914fe 2862 case NL80211_IFTYPE_WDS:
a7767f95 2863 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2864 return 0;
b203ca39 2865 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2866 return 0;
2867 break;
f142c6b9
JB		 2868 case NL80211_IFTYPE_P2P_DEVICE:
2869 if (!ieee80211_is_public_action(hdr, skb->len) &&
2870 !ieee80211_is_probe_req(hdr->frame_control) &&
2871 !ieee80211_is_probe_resp(hdr->frame_control) &&
2872 !ieee80211_is_beacon(hdr->frame_control))
2873 return 0;
2874 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
2875 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
2876 break;
2ca27bcf 2877 default:
fb1c1cd6 2878 /* should never get here */
f142c6b9 2879 WARN_ON_ONCE(1);
fb1c1cd6 2880 break;
23a24def
JB		 2881 }
2882
2883 return 1;
2884}
2885
4406c376
JB		 2886/*
2887 * This function returns whether or not the SKB
2888 * was destined for RX processing or not, which,
2889 * if consume is true, is equivalent to whether
2890 * or not the skb was consumed.
2891 */
2892static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2893 struct sk_buff *skb, bool consume)
2894{
2895 struct ieee80211_local *local = rx->local;
2896 struct ieee80211_sub_if_data *sdata = rx->sdata;
2897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2898 struct ieee80211_hdr *hdr = (void *)skb->data;
2899 int prepares;
2900
2901 rx->skb = skb;
554891e6 2902 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2903 prepares = prepare_for_handlers(rx, hdr);
2904
2905 if (!prepares)
2906 return false;
2907
4406c376
JB		 2908 if (!consume) {
2909 skb = skb_copy(skb, GFP_ATOMIC);
2910 if (!skb) {
2911 if (net_ratelimit())
2912 wiphy_debug(local->hw.wiphy,
b305dae4 2913 "failed to copy skb for %s\n",
4406c376
JB		 2914 sdata->name);
2915 return true;
2916 }
2917
2918 rx->skb = skb;
2919 }
2920
2921 ieee80211_invoke_rx_handlers(rx);
2922 return true;
2923}
2924
571ecf67 2925/*
6368e4b1
RR		 2926 * This is the actual Rx frames handler. as it blongs to Rx path it must
2927 * be called with rcu_read_lock protection.
571ecf67 2928 */
71ebb4aa 2929static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2930 struct sk_buff *skb)
571ecf67
JB		 2931{
2932 struct ieee80211_local *local = hw_to_local(hw);
2933 struct ieee80211_sub_if_data *sdata;
571ecf67 2934 struct ieee80211_hdr *hdr;
e3cf8b3f 2935 __le16 fc;
5cf121c3 2936 struct ieee80211_rx_data rx;
4406c376 2937 struct ieee80211_sub_if_data *prev;
56af3268 2938 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2939 int err = 0;
571ecf67 2940
e3cf8b3f 2941 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2942 memset(&rx, 0, sizeof(rx));
2943 rx.skb = skb;
2944 rx.local = local;
72abd81b 2945
e3cf8b3f 2946 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2947 local->dot11ReceivedFragmentCount++;
571ecf67 2948
4a4f1a58
JB		 2949 if (ieee80211_is_mgmt(fc)) {
2950 /* drop frame if too short for header */
2951 if (skb->len < ieee80211_hdrlen(fc))
2952 err = -ENOBUFS;
2953 else
2954 err = skb_linearize(skb);
2955 } else {
e3cf8b3f 2956 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
4a4f1a58 2957 }
e3cf8b3f
ZY		 2958
2959 if (err) {
2960 dev_kfree_skb(skb);
2961 return;
2962 }
2963
2964 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2965 ieee80211_parse_qos(&rx);
d1c3a37c 2966 ieee80211_verify_alignment(&rx);
38f3714d 2967
d48b2968
JB		 2968 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2969 ieee80211_is_beacon(hdr->frame_control)))
2970 ieee80211_scan_rx(local, skb);
2971
e3cf8b3f 2972 if (ieee80211_is_data(fc)) {
56af3268 2973 prev_sta = NULL;
4406c376 2974
7852e361 2975 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2976 if (!prev_sta) {
2977 prev_sta = sta;
2978 continue;
2979 }
2980
2981 rx.sta = prev_sta;
2982 rx.sdata = prev_sta->sdata;
4406c376 2983 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2984
56af3268 2985 prev_sta = sta;
4406c376 2986 }
56af3268
BG		 2987
2988 if (prev_sta) {
2989 rx.sta = prev_sta;
2990 rx.sdata = prev_sta->sdata;
2991
4406c376 2992 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2993 return;
8e26d5ad 2994 goto out;
56af3268 2995 }
4406c376
JB		 2996 }
2997
4b0dd98e 2998 prev = NULL;
b2e7771e 2999
4b0dd98e
JB		 3000 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3001 if (!ieee80211_sdata_running(sdata))
3002 continue;
340e11f3 3003
4b0dd98e
JB		 3004 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3005 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3006 continue;
340e11f3 3007
4b0dd98e
JB		 3008 /*
3009 * frame is destined for this interface, but if it's
3010 * not also for the previous one we handle that after
3011 * the loop to avoid copying the SKB once too much
3012 */
4bb29f8c 3013
4b0dd98e 3014 if (!prev) {
abe60632 3015 prev = sdata;
4b0dd98e 3016 continue;
340e11f3 3017 }
4bb29f8c 3018
7852e361 3019 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 3020 rx.sdata = prev;
3021 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 3022
4b0dd98e
JB		 3023 prev = sdata;
3024 }
3025
3026 if (prev) {
7852e361 3027 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 3028 rx.sdata = prev;
4406c376 3029
4b0dd98e
JB		 3030 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3031 return;
571ecf67 3032 }
4406c376 3033
8e26d5ad 3034 out:
4406c376 3035 dev_kfree_skb(skb);
571ecf67 3036}
6368e4b1
RR		 3037
3038/*
3039 * This is the receive path handler. It is called by a low level driver when an
3040 * 802.11 MPDU is received from the hardware.
3041 */
103bf9f7 3042void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3043{
3044 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3045 struct ieee80211_rate *rate = NULL;
3046 struct ieee80211_supported_band *sband;
f1d58c25 3047 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3048
d20ef63d
JB		 3049 WARN_ON_ONCE(softirq_count() == 0);
3050
444e3803 3051 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
77a980dc 3052 goto drop;
8318d78a
JB		 3053
3054 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3055 if (WARN_ON(!sband))
3056 goto drop;
8318d78a 3057
89c3a8ac
JB		 3058 /*
3059 * If we're suspending, it is possible although not too likely
3060 * that we'd be receiving frames after having already partially
3061 * quiesced the stack. We can't process such frames then since
3062 * that might, for example, cause stations to be added or other
3063 * driver callbacks be invoked.
3064 */
77a980dc
JB		 3065 if (unlikely(local->quiescing || local->suspended))
3066 goto drop;
89c3a8ac 3067
04800ada
AN		 3068 /* We might be during a HW reconfig, prevent Rx for the same reason */
3069 if (unlikely(local->in_reconfig))
3070 goto drop;
3071
ea77f12f
JB		 3072 /*
3073 * The same happens when we're not even started,
3074 * but that's worth a warning.
3075 */
77a980dc
JB		 3076 if (WARN_ON(!local->started))
3077 goto drop;
ea77f12f 3078
fc885189 3079 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3080 /*
fc885189
JB		 3081 * Validate the rate, unless a PLCP error means that
3082 * we probably can't have a valid rate here anyway.
e5d6eb83 3083 */
fc885189
JB		 3084
3085 if (status->flag & RX_FLAG_HT) {
3086 /*
3087 * rate_idx is MCS index, which can be [0-76]
3088 * as documented on:
3089 *
3090 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3091 *
3092 * Anything else would be some sort of driver or
3093 * hardware error. The driver should catch hardware
3094 * errors.
3095 */
444e3803 3096 if (WARN(status->rate_idx > 76,
fc885189
JB		 3097 "Rate marked as an HT rate but passed "
3098 "status->rate_idx is not "
3099 "an MCS index [0-76]: %d (0x%02x)\n",
3100 status->rate_idx,
3101 status->rate_idx))
3102 goto drop;
3103 } else {
444e3803 3104 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
fc885189
JB		 3105 goto drop;
3106 rate = &sband->bitrates[status->rate_idx];
3107 }
0fb8ca45 3108 }
6368e4b1 3109
554891e6
JB		 3110 status->rx_flags = 0;
3111
6368e4b1
RR		 3112 /*
3113 * key references and virtual interfaces are protected using RCU
3114 * and this requires that we are in a read-side RCU section during
3115 * receive processing
3116 */
3117 rcu_read_lock();
3118
3119 /*
3120 * Frames with failed FCS/PLCP checksum are not returned,
3121 * all other frames are returned without radiotap header
3122 * if it was previously present.
3123 * Also, frames with less than 16 bytes are dropped.
3124 */
f1d58c25 3125 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3126 if (!skb) {
3127 rcu_read_unlock();
3128 return;
3129 }
3130
e1e54068
JB		 3131 ieee80211_tpt_led_trig_rx(local,
3132 ((struct ieee80211_hdr *)skb->data)->frame_control,
3133 skb->len);
071d9ac2 3134 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3135
3136 rcu_read_unlock();
77a980dc
JB		 3137
3138 return;
3139 drop:
3140 kfree_skb(skb);
6368e4b1 3141}
103bf9f7 3142EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3143
3144/* This is a version of the rx handler that can be called from hard irq
3145 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3146void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3147{
3148 struct ieee80211_local *local = hw_to_local(hw);
3149
3150 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3151
571ecf67
JB		 3152 skb->pkt_type = IEEE80211_RX_MSG;
3153 skb_queue_tail(&local->skb_queue, skb);
3154 tasklet_schedule(&local->tasklet);
3155}
3156EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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