projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[deliverable/linux.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
e3cf8b3f 45 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
f1d58c25 57static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 58 int present_fcs_len)
b2e7771e 59{
f1d58c25 60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 62
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 return 1;
0869aea0 65 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 66 return 1;
87228f57
HH		 67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 70 return 1;
71 return 0;
72}
73
601ae7f2
BR		 74static int
75ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
77{
78 int len;
79
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
82
6ebacbb7 83 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 84 len += 8;
7fee5372 85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 86 len += 1;
601ae7f2
BR		 87
88 if (len & 1) /* padding for RX_FLAGS if necessary */
89 len++;
90
6d744bac
JB		 91 if (status->flag & RX_FLAG_HT) /* HT info */
92 len += 3;
93
601ae7f2
BR		 94 return len;
95}
96
d1c3a37c 97/*
601ae7f2
BR		 98 * ieee80211_add_rx_radiotap_header - add radiotap header
99 *
100 * add a radiotap header containing all the fields which the hardware provided.
101 */
102static void
103ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct sk_buff *skb,
601ae7f2
BR		 105 struct ieee80211_rate *rate,
106 int rtap_len)
107{
f1d58c25 108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 109 struct ieee80211_radiotap_header *rthdr;
110 unsigned char *pos;
6a86b9c7 111 u16 rx_flags = 0;
601ae7f2
BR		 112
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
115
116 /* radiotap header, set always present flags */
117 rthdr->it_present =
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
123
124 pos = (unsigned char *)(rthdr+1);
125
126 /* the order of the following fields is important */
127
128 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 130 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 131 rthdr->it_present |=
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 pos += 8;
134 }
135
136 /* IEEE80211_RADIOTAP_FLAGS */
137 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
138 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 143 pos++;
144
145 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 146 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 147 /*
f8d1ccf1 148 * Without rate information don't add it. If we have,
38f37be2 149 * MCS information is a separate field in radiotap,
73b48099
JB		 150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 152 */
153 *pos = 0;
8d6f658e 154 } else {
ebe6c7ba 155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 156 *pos = rate->bitrate / 5;
8d6f658e 157 }
601ae7f2
BR		 158 pos++;
159
160 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 161 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 162 pos += 2;
163 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 pos);
5f0b7de5
JB		 166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
168 pos);
f8d1ccf1 169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 pos);
f8d1ccf1 172 else if (rate)
6a86b9c7
JB		 173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 pos);
f8d1ccf1
JB		 175 else
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 177 pos += 2;
178
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 182 *pos = status->signal;
183 rthdr->it_present |=
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 pos++;
186 }
187
601ae7f2
BR		 188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
189
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
192 pos++;
193
601ae7f2
BR		 194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
195
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 198 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 199 pos++;
aae89831 200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
601ae7f2 203 pos += 2;
6d744bac
JB		 204
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
207 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
208 IEEE80211_RADIOTAP_MCS_HAVE_GI |
209 IEEE80211_RADIOTAP_MCS_HAVE_BW;
210 *pos = 0;
211 if (status->flag & RX_FLAG_SHORT_GI)
212 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
213 if (status->flag & RX_FLAG_40MHZ)
214 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
215 pos++;
216 *pos++ = status->rate_idx;
217 }
601ae7f2
BR		 218}
219
b2e7771e
JB		 220/*
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
224 */
225static struct sk_buff *
226ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 227 struct ieee80211_rate *rate)
b2e7771e 228{
f1d58c25 229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 230 struct ieee80211_sub_if_data *sdata;
293702a3 231 int needed_headroom;
b2e7771e
JB		 232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
b2e7771e
JB		 235
236 /*
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
240 *
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
243 */
0869aea0
JB		 244
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 247
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
250
e3cf8b3f
ZY		 251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
b2e7771e 257 if (!local->monitors) {
0869aea0 258 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 259 dev_kfree_skb(origskb);
260 return NULL;
261 }
262
0869aea0 263 return remove_monitor_info(local, origskb);
b2e7771e
JB		 264 }
265
0869aea0 266 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 267 /* only need to expand headroom if necessary */
268 skb = origskb;
269 origskb = NULL;
270
271 /*
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
277 */
278 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 280 dev_kfree_skb(skb);
281 return NULL;
282 }
283 } else {
284 /*
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
287 */
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
289
0869aea0 290 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 291
292 if (!skb)
293 return origskb;
294 }
295
0869aea0
JB		 296 /* prepend radiotap information */
297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 298
ce3edf6d 299 skb_reset_mac_header(skb);
b2e7771e
JB		 300 skb->ip_summed = CHECKSUM_UNNECESSARY;
301 skb->pkt_type = PACKET_OTHERHOST;
302 skb->protocol = htons(ETH_P_802_2);
303
304 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 305 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 306 continue;
307
3d30d949
MW		 308 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
309 continue;
310
9607e6b6 311 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 312 continue;
313
b2e7771e
JB		 314 if (prev_dev) {
315 skb2 = skb_clone(skb, GFP_ATOMIC);
316 if (skb2) {
317 skb2->dev = prev_dev;
5548a8a1 318 netif_receive_skb(skb2);
b2e7771e
JB		 319 }
320 }
321
322 prev_dev = sdata->dev;
323 sdata->dev->stats.rx_packets++;
324 sdata->dev->stats.rx_bytes += skb->len;
325 }
326
327 if (prev_dev) {
328 skb->dev = prev_dev;
5548a8a1 329 netif_receive_skb(skb);
b2e7771e
JB		 330 } else
331 dev_kfree_skb(skb);
332
333 return origskb;
334}
335
336
5cf121c3 337static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 338{
238f74a2 339 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 340 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 341 int tid, seqno_idx, security_idx;
6e0d114d
JB		 342
343 /* does the frame have a qos control field? */
238f74a2
HH		 344 if (ieee80211_is_data_qos(hdr->frame_control)) {
345 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 346 /* frame has qos control */
238f74a2 347 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 348 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 349 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 350
351 seqno_idx = tid;
352 security_idx = tid;
6e0d114d 353 } else {
1411f9b5
JB		 354 /*
355 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
356 *
357 * Sequence numbers for management frames, QoS data
358 * frames with a broadcast/multicast address in the
359 * Address 1 field, and all non-QoS data frames sent
360 * by QoS STAs are assigned using an additional single
361 * modulo-4096 counter, [...]
362 *
363 * We also use that counter for non-QoS STAs.
364 */
9e26297a
JB		 365 seqno_idx = NUM_RX_DATA_QUEUES;
366 security_idx = 0;
367 if (ieee80211_is_mgmt(hdr->frame_control))
368 security_idx = NUM_RX_DATA_QUEUES;
369 tid = 0;
6e0d114d 370 }
52865dfd 371
9e26297a
JB		 372 rx->seqno_idx = seqno_idx;
373 rx->security_idx = security_idx;
6e0d114d
JB		 374 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
375 * For now, set skb->priority to 0 for other cases. */
376 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 377}
6e0d114d 378
d1c3a37c
JB		 379/**
380 * DOC: Packet alignment
381 *
382 * Drivers always need to pass packets that are aligned to two-byte boundaries
383 * to the stack.
384 *
385 * Additionally, should, if possible, align the payload data in a way that
386 * guarantees that the contained IP header is aligned to a four-byte
387 * boundary. In the case of regular frames, this simply means aligning the
388 * payload to a four-byte boundary (because either the IP header is directly
389 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 390 * in front of it). If the payload data is not properly aligned and the
391 * architecture doesn't support efficient unaligned operations, mac80211
392 * will align the data.
d1c3a37c
JB		 393 *
394 * With A-MSDU frames, however, the payload data address must yield two modulo
395 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
396 * push the IP header further back to a multiple of four again. Thankfully, the
397 * specs were sane enough this time around to require padding each A-MSDU
398 * subframe to a length that is a multiple of four.
399 *
25985edc 400 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 401 * the payload is not supported, the driver is required to move the 802.11
402 * header to be directly in front of the payload in that case.
403 */
404static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 405{
59d9cb07
KV		 406#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
407 WARN_ONCE((unsigned long)rx->skb->data & 1,
408 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 409#endif
6e0d114d
JB		 410}
411
6368e4b1 412
571ecf67
JB		 413/* rx handlers */
414
49461622 415static ieee80211_rx_result debug_noinline
5cf121c3 416ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 417{
418 struct ieee80211_local *local = rx->local;
554891e6 419 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 420 struct sk_buff *skb = rx->skb;
421
79f460ca
LC		 422 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
423 !local->sched_scanning))
4080c7cd
JB		 424 return RX_CONTINUE;
425
b23b025f 426 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 427 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
428 local->sched_scanning)
f1d58c25 429 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 430
4080c7cd
JB		 431 /* scanning finished during invoking of handlers */
432 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
433 return RX_DROP_UNUSABLE;
571ecf67
JB		 434}
435
3cfcf6ac
JM		 436
437static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
438{
439 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
440
441 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
442 return 0;
443
444 return ieee80211_is_robust_mgmt_frame(hdr);
445}
446
447
448static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
449{
450 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
451
452 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
453 return 0;
454
455 return ieee80211_is_robust_mgmt_frame(hdr);
456}
457
458
459/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
460static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
461{
462 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
463 struct ieee80211_mmie *mmie;
464
465 if (skb->len < 24 + sizeof(*mmie) ||
466 !is_multicast_ether_addr(hdr->da))
467 return -1;
468
469 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
470 return -1; /* not a robust management frame */
471
472 mmie = (struct ieee80211_mmie *)
473 (skb->data + skb->len - sizeof(*mmie));
474 if (mmie->element_id != WLAN_EID_MMIE ||
475 mmie->length != sizeof(*mmie) - 2)
476 return -1;
477
478 return le16_to_cpu(mmie->key_id);
479}
480
481
33b64eb2 482static ieee80211_rx_result
5cf121c3 483ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 484{
a7767f95 485 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 486 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 487
a7767f95 488 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 489 if (is_multicast_ether_addr(hdr->addr1)) {
490 if (ieee80211_has_tods(hdr->frame_control) ||
491 !ieee80211_has_fromds(hdr->frame_control))
492 return RX_DROP_MONITOR;
888d04df 493 if (compare_ether_addr(hdr->addr3, dev_addr) == 0)
3c5772a5
JC		 494 return RX_DROP_MONITOR;
495 } else {
496 if (!ieee80211_has_a4(hdr->frame_control))
497 return RX_DROP_MONITOR;
888d04df 498 if (compare_ether_addr(hdr->addr4, dev_addr) == 0)
3c5772a5
JC		 499 return RX_DROP_MONITOR;
500 }
33b64eb2
LCC		 501 }
502
503 /* If there is not an established peer link and this is not a peer link
504 * establisment frame, beacon or probe, drop the frame.
505 */
506
57cf8043 507 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 508 struct ieee80211_mgmt *mgmt;
d6d1a5a7 509
a7767f95 510 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 511 return RX_DROP_MONITOR;
512
a7767f95 513 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 514 u8 category;
33b64eb2 515 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 516 category = mgmt->u.action.category;
517 if (category != WLAN_CATEGORY_MESH_ACTION &&
518 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 519 return RX_DROP_MONITOR;
33b64eb2 520 return RX_CONTINUE;
33b64eb2
LCC		 521 }
522
a7767f95
HH		 523 if (ieee80211_is_probe_req(hdr->frame_control) ||
524 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 525 ieee80211_is_beacon(hdr->frame_control) ||
526 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 527 return RX_CONTINUE;
528
529 return RX_DROP_MONITOR;
530
531 }
532
902acc78
JB		 533 return RX_CONTINUE;
534}
33b64eb2 535
1edfb1af
JB		 536#define SEQ_MODULO 0x1000
537#define SEQ_MASK 0xfff
538
539static inline int seq_less(u16 sq1, u16 sq2)
540{
541 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
542}
543
544static inline u16 seq_inc(u16 sq)
545{
546 return (sq + 1) & SEQ_MASK;
547}
548
549static inline u16 seq_sub(u16 sq1, u16 sq2)
550{
551 return (sq1 - sq2) & SEQ_MASK;
552}
553
554
555static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
556 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 557 int index)
1edfb1af 558{
24a8fdad 559 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 560 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 561 struct ieee80211_rx_status *status;
1edfb1af 562
dd318575
JB		 563 lockdep_assert_held(&tid_agg_rx->reorder_lock);
564
1edfb1af
JB		 565 if (!skb)
566 goto no_frame;
567
071d9ac2 568 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 569 tid_agg_rx->stored_mpdu_num--;
570 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 571 status = IEEE80211_SKB_RXCB(skb);
572 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 573 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 574
575no_frame:
576 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
577}
578
579static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
580 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 581 u16 head_seq_num)
1edfb1af
JB		 582{
583 int index;
584
dd318575
JB		 585 lockdep_assert_held(&tid_agg_rx->reorder_lock);
586
1edfb1af
JB		 587 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
588 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
589 tid_agg_rx->buf_size;
24a8fdad 590 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 591 }
592}
593
594/*
595 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
596 * the skb was added to the buffer longer than this time ago, the earlier
597 * frames that have not yet been received are assumed to be lost and the skb
598 * can be released for processing. This may also release other skb's from the
599 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 600 *
601 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 602 */
603#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
604
aa0c8636 605static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 606 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 607{
2bff8ebf 608 int index, j;
aa0c8636 609
dd318575
JB		 610 lockdep_assert_held(&tid_agg_rx->reorder_lock);
611
aa0c8636
CL		 612 /* release the buffer until next missing frame */
613 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
614 tid_agg_rx->buf_size;
615 if (!tid_agg_rx->reorder_buf[index] &&
07ae2dfc 616 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 617 /*
618 * No buffers ready to be released, but check whether any
619 * frames in the reorder buffer have timed out.
620 */
aa0c8636
CL		 621 int skipped = 1;
622 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
623 j = (j + 1) % tid_agg_rx->buf_size) {
624 if (!tid_agg_rx->reorder_buf[j]) {
625 skipped++;
626 continue;
627 }
499fe9a4
DH		 628 if (skipped &&
629 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 630 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 631 goto set_release_timer;
aa0c8636
CL		 632
633#ifdef CONFIG_MAC80211_HT_DEBUG
634 if (net_ratelimit())
0fb9a9ec
JP		 635 wiphy_debug(hw->wiphy,
636 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 637#endif
24a8fdad 638 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 639
640 /*
641 * Increment the head seq# also for the skipped slots.
642 */
643 tid_agg_rx->head_seq_num =
644 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
645 skipped = 0;
646 }
647 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 648 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 649 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
650 tid_agg_rx->buf_size;
651 }
2bff8ebf
CL		 652
653 if (tid_agg_rx->stored_mpdu_num) {
654 j = index = seq_sub(tid_agg_rx->head_seq_num,
655 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
656
657 for (; j != (index - 1) % tid_agg_rx->buf_size;
658 j = (j + 1) % tid_agg_rx->buf_size) {
659 if (tid_agg_rx->reorder_buf[j])
660 break;
661 }
662
663 set_release_timer:
664
665 mod_timer(&tid_agg_rx->reorder_timer,
334df731 666 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 667 HT_RX_REORDER_BUF_TIMEOUT);
668 } else {
669 del_timer(&tid_agg_rx->reorder_timer);
670 }
aa0c8636
CL		 671}
672
1edfb1af
JB		 673/*
674 * As this function belongs to the RX path it must be under
675 * rcu_read_lock protection. It returns false if the frame
676 * can be processed immediately, true if it was consumed.
677 */
678static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
679 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 680 struct sk_buff *skb)
1edfb1af
JB		 681{
682 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
683 u16 sc = le16_to_cpu(hdr->seq_ctrl);
684 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
685 u16 head_seq_num, buf_size;
686 int index;
2bff8ebf 687 bool ret = true;
1edfb1af 688
dd318575
JB		 689 spin_lock(&tid_agg_rx->reorder_lock);
690
1edfb1af
JB		 691 buf_size = tid_agg_rx->buf_size;
692 head_seq_num = tid_agg_rx->head_seq_num;
693
694 /* frame with out of date sequence number */
695 if (seq_less(mpdu_seq_num, head_seq_num)) {
696 dev_kfree_skb(skb);
2bff8ebf 697 goto out;
1edfb1af
JB		 698 }
699
700 /*
701 * If frame the sequence number exceeds our buffering window
702 * size release some previous frames to make room for this one.
703 */
704 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
705 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
706 /* release stored frames up to new head to stack */
24a8fdad 707 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 708 }
709
710 /* Now the new frame is always in the range of the reordering buffer */
711
712 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
713
714 /* check if we already stored this frame */
715 if (tid_agg_rx->reorder_buf[index]) {
716 dev_kfree_skb(skb);
2bff8ebf 717 goto out;
1edfb1af
JB		 718 }
719
720 /*
721 * If the current MPDU is in the right order and nothing else
722 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 723 * If it is first but there's something stored, we may be able
724 * to release frames after this one.
1edfb1af
JB		 725 */
726 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
727 tid_agg_rx->stored_mpdu_num == 0) {
728 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 729 ret = false;
730 goto out;
1edfb1af
JB		 731 }
732
733 /* put the frame in the reordering buffer */
734 tid_agg_rx->reorder_buf[index] = skb;
735 tid_agg_rx->reorder_time[index] = jiffies;
736 tid_agg_rx->stored_mpdu_num++;
24a8fdad 737 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 738
2bff8ebf
CL		 739 out:
740 spin_unlock(&tid_agg_rx->reorder_lock);
741 return ret;
1edfb1af
JB		 742}
743
744/*
745 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
746 * true if the MPDU was buffered, false if it should be processed.
747 */
24a8fdad 748static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 749{
2569a826
JB		 750 struct sk_buff *skb = rx->skb;
751 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 752 struct ieee80211_hw *hw = &local->hw;
753 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 754 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 755 struct sta_info *sta = rx->sta;
1edfb1af
JB		 756 struct tid_ampdu_rx *tid_agg_rx;
757 u16 sc;
6cc00d54 758 u8 tid, ack_policy;
1edfb1af
JB		 759
760 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 761 goto dont_reorder;
1edfb1af
JB		 762
763 /*
764 * filter the QoS data rx stream according to
765 * STA/TID and check if this STA/TID is on aggregation
766 */
767
1edfb1af 768 if (!sta)
2569a826 769 goto dont_reorder;
1edfb1af 770
6cc00d54
TP		 771 ack_policy = *ieee80211_get_qos_ctl(hdr) &
772 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 773 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
774
a87f736d
JB		 775 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
776 if (!tid_agg_rx)
777 goto dont_reorder;
1edfb1af
JB		 778
779 /* qos null data frames are excluded */
780 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 781 goto dont_reorder;
1edfb1af 782
6cc00d54
TP		 783 /* not part of a BA session */
784 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
785 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
786 goto dont_reorder;
787
660c6a44
TP		 788 /* not actually part of this BA session */
789 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
790 goto dont_reorder;
791
1edfb1af
JB		 792 /* new, potentially un-ordered, ampdu frame - process it */
793
794 /* reset session timer */
795 if (tid_agg_rx->timeout)
796 mod_timer(&tid_agg_rx->session_timer,
797 TU_TO_EXP_TIME(tid_agg_rx->timeout));
798
799 /* if this mpdu is fragmented - terminate rx aggregation session */
800 sc = le16_to_cpu(hdr->seq_ctrl);
801 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 802 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 803 skb_queue_tail(&rx->sdata->skb_queue, skb);
804 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 805 return;
1edfb1af
JB		 806 }
807
a87f736d
JB		 808 /*
809 * No locking needed -- we will only ever process one
810 * RX packet at a time, and thus own tid_agg_rx. All
811 * other code manipulating it needs to (and does) make
812 * sure that we cannot get to it any more before doing
813 * anything with it.
814 */
24a8fdad 815 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 816 return;
817
818 dont_reorder:
24a8fdad 819 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 820}
33b64eb2 821
49461622 822static ieee80211_rx_result debug_noinline
5cf121c3 823ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 824{
a7767f95 825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 826 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 827
828 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
829 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 830 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 831 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 832 hdr->seq_ctrl)) {
554891e6 833 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 834 rx->local->dot11FrameDuplicateCount++;
835 rx->sta->num_duplicates++;
836 }
b1f93314 837 return RX_DROP_UNUSABLE;
571ecf67 838 } else
9e26297a 839 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 840 }
841
571ecf67
JB		 842 if (unlikely(rx->skb->len < 16)) {
843 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 844 return RX_DROP_MONITOR;
571ecf67
JB		 845 }
846
571ecf67
JB		 847 /* Drop disallowed frame classes based on STA auth/assoc state;
848 * IEEE 802.11, Chap 5.5.
849 *
ccd7b362
JB		 850 * mac80211 filters only based on association state, i.e. it drops
851 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 852 * deauth/disassoc frames when needed. In addition, hostapd is
853 * responsible for filtering on both auth and assoc states.
854 */
33b64eb2 855
902acc78 856 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 857 return ieee80211_rx_mesh_check(rx);
33b64eb2 858
a7767f95
HH		 859 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
860 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 861 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 862 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 863 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 864 /*
865 * accept port control frames from the AP even when it's not
866 * yet marked ASSOC to prevent a race where we don't set the
867 * assoc bit quickly enough before it sends the first frame
868 */
869 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 870 ieee80211_is_data_present(hdr->frame_control)) {
871 u16 ethertype;
872 u8 *payload;
873
874 payload = rx->skb->data +
875 ieee80211_hdrlen(hdr->frame_control);
876 ethertype = (payload[6] << 8) | payload[7];
877 if (cpu_to_be16(ethertype) ==
878 rx->sdata->control_port_protocol)
879 return RX_CONTINUE;
880 }
21fc7560
JB		 881
882 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
883 cfg80211_rx_spurious_frame(rx->sdata->dev,
884 hdr->addr2,
885 GFP_ATOMIC))
886 return RX_DROP_UNUSABLE;
887
e4c26add 888 return RX_DROP_MONITOR;
2a33bee2 889 }
571ecf67 890
9ae54c84 891 return RX_CONTINUE;
570bd537
JB		 892}
893
894
49461622 895static ieee80211_rx_result debug_noinline
5cf121c3 896ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 897{
eb9fb5b8
JB		 898 struct sk_buff *skb = rx->skb;
899 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
900 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 901 int keyidx;
902 int hdrlen;
e4c26add 903 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 904 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 905 int mmie_keyidx = -1;
761ab470 906 __le16 fc;
570bd537 907
3017b80b
JB		 908 /*
909 * Key selection 101
910 *
3cfcf6ac 911 * There are four types of keys:
3017b80b 912 * - GTK (group keys)
3cfcf6ac 913 * - IGTK (group keys for management frames)
3017b80b
JB		 914 * - PTK (pairwise keys)
915 * - STK (station-to-station pairwise keys)
916 *
917 * When selecting a key, we have to distinguish between multicast
918 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 919 * use PTKs and STKs while the former always use GTKs and IGTKs.
920 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
921 * unicast frames can also use key indices like GTKs. Hence, if we
922 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 923 *
8dc06a1c
JB		 924 * Note that in a regular BSS, multicast frames are sent by the
925 * AP only, associated stations unicast the frame to the AP first
926 * which then multicasts it on their behalf.
927 *
3017b80b
JB		 928 * There is also a slight problem in IBSS mode: GTKs are negotiated
929 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 930 * The spec seems to expect that one negotiates the same key with
931 * every station but there's no such requirement; VLANs could be
932 * possible.
3017b80b
JB		 933 */
934
3017b80b 935 /*
1990af8d 936 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 937 * addressed to us nor a multicast frame.
938 */
554891e6 939 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 940 return RX_CONTINUE;
3017b80b 941
2569a826
JB		 942 /* start without a key */
943 rx->key = NULL;
944
d4e46a3d 945 if (rx->sta)
e31b8213 946 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 947
761ab470
JB		 948 fc = hdr->frame_control;
949
950 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 951 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
952
e31b8213
JB		 953 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
954 rx->key = sta_ptk;
dc1580dd
JB		 955 if ((status->flag & RX_FLAG_DECRYPTED) &&
956 (status->flag & RX_FLAG_IV_STRIPPED))
957 return RX_CONTINUE;
0c7c10c7 958 /* Skip decryption if the frame is not protected. */
761ab470 959 if (!ieee80211_has_protected(fc))
0c7c10c7 960 return RX_CONTINUE;
3cfcf6ac
JM		 961 } else if (mmie_keyidx >= 0) {
962 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 963 if ((status->flag & RX_FLAG_DECRYPTED) &&
964 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 965 return RX_CONTINUE;
966
967 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
968 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
969 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 970 if (rx->sta)
971 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
972 if (!rx->key)
973 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 974 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 975 /*
976 * The frame was not protected, so skip decryption. However, we
977 * need to set rx->key if there is a key that could have been
978 * used so that the frame may be dropped if encryption would
979 * have been expected.
980 */
981 struct ieee80211_key *key = NULL;
897bed8b
JB		 982 struct ieee80211_sub_if_data *sdata = rx->sdata;
983 int i;
984
761ab470 985 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 986 is_multicast_ether_addr(hdr->addr1) &&
987 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
988 rx->key = key;
897bed8b
JB		 989 else {
990 if (rx->sta) {
991 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
992 key = rcu_dereference(rx->sta->gtk[i]);
993 if (key)
994 break;
995 }
996 }
997 if (!key) {
998 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
999 key = rcu_dereference(sdata->keys[i]);
1000 if (key)
1001 break;
1002 }
1003 }
1004 if (key)
1005 rx->key = key;
1006 }
0c7c10c7 1007 return RX_CONTINUE;
571ecf67 1008 } else {
39184b15 1009 u8 keyid;
3017b80b
JB		 1010 /*
1011 * The device doesn't give us the IV so we won't be
1012 * able to look up the key. That's ok though, we
1013 * don't need to decrypt the frame, we just won't
1014 * be able to keep statistics accurate.
1015 * Except for key threshold notifications, should
1016 * we somehow allow the driver to tell us which key
1017 * the hardware used if this flag is set?
1018 */
eb9fb5b8
JB		 1019 if ((status->flag & RX_FLAG_DECRYPTED) &&
1020 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1021 return RX_CONTINUE;
3017b80b 1022
761ab470 1023 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1024
1025 if (rx->skb->len < 8 + hdrlen)
e4c26add 1026 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1027
1028 /*
1029 * no need to call ieee80211_wep_get_keyidx,
1030 * it verifies a bunch of things we've done already
1031 */
39184b15
ZY		 1032 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1033 keyidx = keyid >> 6;
3017b80b 1034
e31b8213
JB		 1035 /* check per-station GTK first, if multicast packet */
1036 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1037 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1038
e31b8213
JB		 1039 /* if not found, try default key */
1040 if (!rx->key) {
1041 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1042
1043 /*
1044 * RSNA-protected unicast frames should always be
1045 * sent with pairwise or station-to-station keys,
1046 * but for WEP we allow using a key index as well.
1047 */
1048 if (rx->key &&
1049 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1050 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1051 !is_multicast_ether_addr(hdr->addr1))
1052 rx->key = NULL;
1053 }
571ecf67
JB		 1054 }
1055
3017b80b 1056 if (rx->key) {
95acac61
JB		 1057 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1058 return RX_DROP_MONITOR;
1059
571ecf67 1060 rx->key->tx_rx_count++;
011bfcc4 1061 /* TODO: add threshold stuff again */
1990af8d 1062 } else {
e4c26add 1063 return RX_DROP_MONITOR;
70f08765
JB		 1064 }
1065
97359d12
JB		 1066 switch (rx->key->conf.cipher) {
1067 case WLAN_CIPHER_SUITE_WEP40:
1068 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1069 result = ieee80211_crypto_wep_decrypt(rx);
1070 break;
97359d12 1071 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1072 result = ieee80211_crypto_tkip_decrypt(rx);
1073 break;
97359d12 1074 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1075 result = ieee80211_crypto_ccmp_decrypt(rx);
1076 break;
97359d12 1077 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1078 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1079 break;
3ffc2a90
JB		 1080 default:
1081 /*
1082 * We can reach here only with HW-only algorithms
1083 * but why didn't it decrypt the frame?!
1084 */
1085 return RX_DROP_UNUSABLE;
70f08765
JB		 1086 }
1087
a8286911
JB		 1088 /* the hdr variable is invalid after the decrypt handlers */
1089
e2f036da 1090 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1091 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1092
1093 return result;
70f08765
JB		 1094}
1095
572e0012
KV		 1096static ieee80211_rx_result debug_noinline
1097ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1098{
1099 struct ieee80211_local *local;
1100 struct ieee80211_hdr *hdr;
1101 struct sk_buff *skb;
1102
1103 local = rx->local;
1104 skb = rx->skb;
1105 hdr = (struct ieee80211_hdr *) skb->data;
1106
1107 if (!local->pspolling)
1108 return RX_CONTINUE;
1109
1110 if (!ieee80211_has_fromds(hdr->frame_control))
1111 /* this is not from AP */
1112 return RX_CONTINUE;
1113
1114 if (!ieee80211_is_data(hdr->frame_control))
1115 return RX_CONTINUE;
1116
1117 if (!ieee80211_has_moredata(hdr->frame_control)) {
1118 /* AP has no more frames buffered for us */
1119 local->pspolling = false;
1120 return RX_CONTINUE;
1121 }
1122
1123 /* more data bit is set, let's request a new frame from the AP */
1124 ieee80211_send_pspoll(local, rx->sdata);
1125
1126 return RX_CONTINUE;
1127}
1128
133b8226 1129static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1130{
133b8226 1131 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1132 struct ieee80211_local *local = sdata->local;
0795af57 1133
3e122be0 1134 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1135 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1136 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1137 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1138#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1139 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1140 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1141#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1142}
1143
ff9458d3 1144static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1145{
571ecf67 1146#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1147 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
608383bf 1148 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1149#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1150
c2c98fde 1151 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1152#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1153 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
608383bf 1154 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1155#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1156 return;
1157 }
1158
1159 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1160}
1161
d057e5a3
AN		 1162int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1163{
1164 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1165 bool in_ps;
1166
1167 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1168
1169 /* Don't let the same PS state be set twice */
c2c98fde 1170 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1171 if ((start && in_ps) || (!start && !in_ps))
1172 return -EINVAL;
1173
1174 if (start)
1175 ap_sta_ps_start(sta_inf);
1176 else
1177 ap_sta_ps_end(sta_inf);
1178
1179 return 0;
1180}
1181EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1182
47086fc5
JB		 1183static ieee80211_rx_result debug_noinline
1184ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1185{
1186 struct ieee80211_sub_if_data *sdata = rx->sdata;
1187 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1188 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1189 int tid, ac;
1190
1191 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1192 return RX_CONTINUE;
1193
1194 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1195 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1196 return RX_CONTINUE;
1197
1198 /*
1199 * The device handles station powersave, so don't do anything about
1200 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1201 * it to mac80211 since they're handled.)
1202 */
1203 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1204 return RX_CONTINUE;
1205
1206 /*
1207 * Don't do anything if the station isn't already asleep. In
1208 * the uAPSD case, the station will probably be marked asleep,
1209 * in the PS-Poll case the station must be confused ...
1210 */
c2c98fde 1211 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1212 return RX_CONTINUE;
1213
1214 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1215 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1216 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1217 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1218 else
c2c98fde 1219 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1220 }
47086fc5
JB		 1221
1222 /* Free PS Poll skb here instead of returning RX_DROP that would
1223 * count as an dropped frame. */
1224 dev_kfree_skb(rx->skb);
1225
1226 return RX_QUEUED;
1227 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1228 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1229 ieee80211_has_pm(hdr->frame_control) &&
1230 (ieee80211_is_data_qos(hdr->frame_control) ||
1231 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1232 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1233 ac = ieee802_1d_to_ac[tid & 7];
1234
1235 /*
1236 * If this AC is not trigger-enabled do nothing.
1237 *
1238 * NB: This could/should check a separate bitmap of trigger-
1239 * enabled queues, but for now we only implement uAPSD w/o
1240 * TSPEC changes to the ACs, so they're always the same.
1241 */
1242 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1243 return RX_CONTINUE;
1244
1245 /* if we are in a service period, do nothing */
c2c98fde 1246 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1247 return RX_CONTINUE;
1248
c2c98fde 1249 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1250 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1251 else
c2c98fde 1252 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1253 }
1254
1255 return RX_CONTINUE;
1256}
1257
49461622 1258static ieee80211_rx_result debug_noinline
5cf121c3 1259ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1260{
1261 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1262 struct sk_buff *skb = rx->skb;
1263 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1264 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1265
1266 if (!sta)
9ae54c84 1267 return RX_CONTINUE;
571ecf67 1268
b291ba11
JB		 1269 /*
1270 * Update last_rx only for IBSS packets which are for the current
1271 * BSSID to avoid keeping the current IBSS network alive in cases
1272 * where other STAs start using different BSSID.
1273 */
05c914fe 1274 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1275 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1276 NL80211_IFTYPE_ADHOC);
3af6334c 1277 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1278 sta->last_rx = jiffies;
3af6334c
FF		 1279 if (ieee80211_is_data(hdr->frame_control)) {
1280 sta->last_rx_rate_idx = status->rate_idx;
1281 sta->last_rx_rate_flag = status->flag;
1282 }
1283 }
b291ba11
JB		 1284 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1285 /*
33b64eb2
LCC		 1286 * Mesh beacons will update last_rx when if they are found to
1287 * match the current local configuration when processed.
571ecf67 1288 */
b291ba11 1289 sta->last_rx = jiffies;
3af6334c
FF		 1290 if (ieee80211_is_data(hdr->frame_control)) {
1291 sta->last_rx_rate_idx = status->rate_idx;
1292 sta->last_rx_rate_flag = status->flag;
1293 }
571ecf67
JB		 1294 }
1295
554891e6 1296 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1297 return RX_CONTINUE;
571ecf67 1298
3cf335d5
KV		 1299 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1300 ieee80211_sta_rx_notify(rx->sdata, hdr);
1301
571ecf67
JB		 1302 sta->rx_fragments++;
1303 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1304 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1305 sta->last_signal = status->signal;
1306 ewma_add(&sta->avg_signal, -status->signal);
1307 }
571ecf67 1308
72eaa43a
JB		 1309 /*
1310 * Change STA power saving mode only at the end of a frame
1311 * exchange sequence.
1312 */
d057e5a3
AN		 1313 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1314 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1315 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1316 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1317 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1318 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1319 /*
1320 * Ignore doze->wake transitions that are
1321 * indicated by non-data frames, the standard
1322 * is unclear here, but for example going to
1323 * PS mode and then scanning would cause a
1324 * doze->wake transition for the probe request,
1325 * and that is clearly undesirable.
1326 */
1327 if (ieee80211_is_data(hdr->frame_control) &&
1328 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1329 ap_sta_ps_end(sta);
72eaa43a
JB		 1330 } else {
1331 if (ieee80211_has_pm(hdr->frame_control))
1332 ap_sta_ps_start(sta);
1333 }
571ecf67
JB		 1334 }
1335
22403def
JB		 1336 /*
1337 * Drop (qos-)data::nullfunc frames silently, since they
1338 * are used only to control station power saving mode.
1339 */
1340 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1341 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1342 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1343
1344 /*
1345 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1346 * that was not moved to a 4-addr STA vlan yet send
1347 * the event to userspace and for older hostapd drop
1348 * the frame to the monitor interface.
d524215f
FF		 1349 */
1350 if (ieee80211_has_a4(hdr->frame_control) &&
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1352 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1353 !rx->sdata->u.vlan.sta))) {
1354 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1355 cfg80211_rx_unexpected_4addr_frame(
1356 rx->sdata->dev, sta->sta.addr,
1357 GFP_ATOMIC);
d524215f 1358 return RX_DROP_MONITOR;
e7f4a940 1359 }
22403def
JB		 1360 /*
1361 * Update counter and free packet here to avoid
1362 * counting this as a dropped packed.
1363 */
571ecf67
JB		 1364 sta->rx_packets++;
1365 dev_kfree_skb(rx->skb);
9ae54c84 1366 return RX_QUEUED;
571ecf67
JB		 1367 }
1368
9ae54c84 1369 return RX_CONTINUE;
571ecf67
JB		 1370} /* ieee80211_rx_h_sta_process */
1371
571ecf67
JB		 1372static inline struct ieee80211_fragment_entry *
1373ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1374 unsigned int frag, unsigned int seq, int rx_queue,
1375 struct sk_buff **skb)
1376{
1377 struct ieee80211_fragment_entry *entry;
1378 int idx;
1379
1380 idx = sdata->fragment_next;
1381 entry = &sdata->fragments[sdata->fragment_next++];
1382 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1383 sdata->fragment_next = 0;
1384
1385 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1386#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1387 struct ieee80211_hdr *hdr =
1388 (struct ieee80211_hdr *) entry->skb_list.next->data;
1389 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1390 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1391 "addr1=%pM addr2=%pM\n",
47846c9b 1392 sdata->name, idx,
571ecf67 1393 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1394 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1395#endif
571ecf67
JB		 1396 __skb_queue_purge(&entry->skb_list);
1397 }
1398
1399 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1400 *skb = NULL;
1401 entry->first_frag_time = jiffies;
1402 entry->seq = seq;
1403 entry->rx_queue = rx_queue;
1404 entry->last_frag = frag;
1405 entry->ccmp = 0;
1406 entry->extra_len = 0;
1407
1408 return entry;
1409}
1410
1411static inline struct ieee80211_fragment_entry *
1412ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1413 unsigned int frag, unsigned int seq,
571ecf67
JB		 1414 int rx_queue, struct ieee80211_hdr *hdr)
1415{
1416 struct ieee80211_fragment_entry *entry;
1417 int i, idx;
1418
1419 idx = sdata->fragment_next;
1420 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1421 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1422
1423 idx--;
1424 if (idx < 0)
1425 idx = IEEE80211_FRAGMENT_MAX - 1;
1426
1427 entry = &sdata->fragments[idx];
1428 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1429 entry->rx_queue != rx_queue ||
1430 entry->last_frag + 1 != frag)
1431 continue;
1432
b73d70ad 1433 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1434
b73d70ad
HH		 1435 /*
1436 * Check ftype and addresses are equal, else check next fragment
1437 */
1438 if (((hdr->frame_control ^ f_hdr->frame_control) &
1439 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1440 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1441 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1442 continue;
1443
ab46623e 1444 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1445 __skb_queue_purge(&entry->skb_list);
1446 continue;
1447 }
1448 return entry;
1449 }
1450
1451 return NULL;
1452}
1453
49461622 1454static ieee80211_rx_result debug_noinline
5cf121c3 1455ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1456{
1457 struct ieee80211_hdr *hdr;
1458 u16 sc;
358c8d9d 1459 __le16 fc;
571ecf67
JB		 1460 unsigned int frag, seq;
1461 struct ieee80211_fragment_entry *entry;
1462 struct sk_buff *skb;
554891e6 1463 struct ieee80211_rx_status *status;
571ecf67 1464
b73d70ad 1465 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1466 fc = hdr->frame_control;
571ecf67
JB		 1467 sc = le16_to_cpu(hdr->seq_ctrl);
1468 frag = sc & IEEE80211_SCTL_FRAG;
1469
358c8d9d 1470 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1471 (rx->skb)->len < 24 ||
1472 is_multicast_ether_addr(hdr->addr1))) {
1473 /* not fragmented */
1474 goto out;
1475 }
1476 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1477
e3cf8b3f
ZY		 1478 if (skb_linearize(rx->skb))
1479 return RX_DROP_UNUSABLE;
1480
058897a4
AK		 1481 /*
1482 * skb_linearize() might change the skb->data and
1483 * previously cached variables (in this case, hdr) need to
1484 * be refreshed with the new data.
1485 */
1486 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1487 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1488
1489 if (frag == 0) {
1490 /* This is the first fragment of a new frame. */
1491 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1492 rx->seqno_idx, &(rx->skb));
97359d12 1493 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1494 ieee80211_has_protected(fc)) {
9e26297a 1495 int queue = rx->security_idx;
571ecf67
JB		 1496 /* Store CCMP PN so that we can verify that the next
1497 * fragment has a sequential PN value. */
1498 entry->ccmp = 1;
1499 memcpy(entry->last_pn,
9190252c 1500 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1501 CCMP_PN_LEN);
1502 }
9ae54c84 1503 return RX_QUEUED;
571ecf67
JB		 1504 }
1505
1506 /* This is a fragment for a frame that should already be pending in
1507 * fragment cache. Add this fragment to the end of the pending entry.
1508 */
9e26297a
JB		 1509 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1510 rx->seqno_idx, hdr);
571ecf67
JB		 1511 if (!entry) {
1512 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1513 return RX_DROP_MONITOR;
571ecf67
JB		 1514 }
1515
1516 /* Verify that MPDUs within one MSDU have sequential PN values.
1517 * (IEEE 802.11i, 8.3.3.4.5) */
1518 if (entry->ccmp) {
1519 int i;
1520 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1521 int queue;
97359d12 1522 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1523 return RX_DROP_UNUSABLE;
571ecf67
JB		 1524 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1525 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1526 pn[i]++;
1527 if (pn[i])
1528 break;
1529 }
9e26297a 1530 queue = rx->security_idx;
9190252c 1531 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1532 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1533 return RX_DROP_UNUSABLE;
571ecf67
JB		 1534 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1535 }
1536
358c8d9d 1537 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1538 __skb_queue_tail(&entry->skb_list, rx->skb);
1539 entry->last_frag = frag;
1540 entry->extra_len += rx->skb->len;
358c8d9d 1541 if (ieee80211_has_morefrags(fc)) {
571ecf67 1542 rx->skb = NULL;
9ae54c84 1543 return RX_QUEUED;
571ecf67
JB		 1544 }
1545
1546 rx->skb = __skb_dequeue(&entry->skb_list);
1547 if (skb_tailroom(rx->skb) < entry->extra_len) {
1548 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1549 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1550 GFP_ATOMIC))) {
1551 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1552 __skb_queue_purge(&entry->skb_list);
e4c26add 1553 return RX_DROP_UNUSABLE;
571ecf67
JB		 1554 }
1555 }
1556 while ((skb = __skb_dequeue(&entry->skb_list))) {
1557 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1558 dev_kfree_skb(skb);
1559 }
1560
1561 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1562 status = IEEE80211_SKB_RXCB(rx->skb);
1563 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1564
1565 out:
1566 if (rx->sta)
1567 rx->sta->rx_packets++;
1568 if (is_multicast_ether_addr(hdr->addr1))
1569 rx->local->dot11MulticastReceivedFrameCount++;
1570 else
1571 ieee80211_led_rx(rx->local);
9ae54c84 1572 return RX_CONTINUE;
571ecf67
JB		 1573}
1574
76ee65bf 1575static int
5cf121c3 1576ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1577{
07346f81 1578 if (unlikely(!rx->sta ||
c2c98fde 1579 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1580 return -EACCES;
571ecf67 1581
76ee65bf 1582 return 0;
571ecf67
JB		 1583}
1584
76ee65bf 1585static int
358c8d9d 1586ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1587{
eb9fb5b8
JB		 1588 struct sk_buff *skb = rx->skb;
1589 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1590
3017b80b 1591 /*
7848ba7d
JB		 1592 * Pass through unencrypted frames if the hardware has
1593 * decrypted them already.
3017b80b 1594 */
eb9fb5b8 1595 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1596 return 0;
571ecf67
JB		 1597
1598 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1599 if (unlikely(!ieee80211_has_protected(fc) &&
1600 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1601 ieee80211_is_data(fc) &&
b3fc9c6c 1602 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1603 return -EACCES;
bef5d1c7
JB		 1604
1605 return 0;
1606}
1607
1608static int
1609ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1610{
1611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1612 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1613 __le16 fc = hdr->frame_control;
bef5d1c7 1614
e3efca0a
JM		 1615 /*
1616 * Pass through unencrypted frames if the hardware has
1617 * decrypted them already.
1618 */
1619 if (status->flag & RX_FLAG_DECRYPTED)
1620 return 0;
bef5d1c7 1621
c2c98fde 1622 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1623 if (unlikely(!ieee80211_has_protected(fc) &&
1624 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1625 rx->key)) {
1626 if (ieee80211_is_deauth(fc))
1627 cfg80211_send_unprot_deauth(rx->sdata->dev,
1628 rx->skb->data,
1629 rx->skb->len);
1630 else if (ieee80211_is_disassoc(fc))
1631 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1632 rx->skb->data,
1633 rx->skb->len);
f2ca3ea4 1634 return -EACCES;
cf4e594e 1635 }
f2ca3ea4 1636 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1637 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1638 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1639 if (ieee80211_is_deauth(fc))
1640 cfg80211_send_unprot_deauth(rx->sdata->dev,
1641 rx->skb->data,
1642 rx->skb->len);
1643 else if (ieee80211_is_disassoc(fc))
1644 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1645 rx->skb->data,
1646 rx->skb->len);
f2ca3ea4 1647 return -EACCES;
cf4e594e 1648 }
f2ca3ea4
JM		 1649 /*
1650 * When using MFP, Action frames are not allowed prior to
1651 * having configured keys.
1652 */
1653 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1654 ieee80211_is_robust_mgmt_frame(
1655 (struct ieee80211_hdr *) rx->skb->data)))
1656 return -EACCES;
1657 }
b3fc9c6c 1658
76ee65bf 1659 return 0;
571ecf67
JB		 1660}
1661
76ee65bf 1662static int
4114fa21 1663__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1664{
eb9fb5b8 1665 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1666 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1667 bool check_port_control = false;
1668 struct ethhdr *ehdr;
1669 int ret;
f14543ee 1670
4114fa21 1671 *port_control = false;
9bc383de
JB		 1672 if (ieee80211_has_a4(hdr->frame_control) &&
1673 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1674 return -1;
9bc383de 1675
fbb327c5
FF		 1676 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1677 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1678
1679 if (!sdata->u.mgd.use_4addr)
1680 return -1;
1681 else
1682 check_port_control = true;
1683 }
1684
9bc383de 1685 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1687 return -1;
571ecf67 1688
fbb327c5 1689 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1690 if (ret < 0)
fbb327c5
FF		 1691 return ret;
1692
1693 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1694 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1695 *port_control = true;
1696 else if (check_port_control)
fbb327c5
FF		 1697 return -1;
1698
1699 return 0;
76ee65bf 1700}
571ecf67 1701
ce3edf6d
JB		 1702/*
1703 * requires that rx->skb is a frame with ethernet header
1704 */
358c8d9d 1705static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1706{
c97c23e3 1707 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1708 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1709 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1710
1711 /*
1712 * Allow EAPOL frames to us/the PAE group address regardless
1713 * of whether the frame was encrypted or not.
1714 */
a621fa4d 1715 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1716 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1717 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1718 return true;
1719
1720 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1721 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1722 return false;
1723
1724 return true;
1725}
1726
1727/*
1728 * requires that rx->skb is a frame with ethernet header
1729 */
76ee65bf 1730static void
5cf121c3 1731ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1732{
eb9fb5b8
JB		 1733 struct ieee80211_sub_if_data *sdata = rx->sdata;
1734 struct net_device *dev = sdata->dev;
76ee65bf 1735 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1736 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1737 struct sta_info *dsta;
554891e6 1738 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1739
76ee65bf
RR		 1740 skb = rx->skb;
1741 xmit_skb = NULL;
571ecf67 1742
05c914fe
JB		 1743 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1744 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1745 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1746 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1747 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1748 if (is_multicast_ether_addr(ehdr->h_dest)) {
1749 /*
1750 * send multicast frames both to higher layers in
1751 * local net stack and back to the wireless medium
1752 */
76ee65bf
RR		 1753 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1754 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1755 printk(KERN_DEBUG "%s: failed to clone "
1756 "multicast frame\n", dev->name);
1757 } else {
abe60632
JB		 1758 dsta = sta_info_get(sdata, skb->data);
1759 if (dsta) {
ce3edf6d
JB		 1760 /*
1761 * The destination station is associated to
1762 * this AP (in this VLAN), so send the frame
1763 * directly to it and do not pass it to local
1764 * net stack.
571ecf67 1765 */
76ee65bf 1766 xmit_skb = skb;
571ecf67
JB		 1767 skb = NULL;
1768 }
571ecf67
JB		 1769 }
1770 }
1771
1772 if (skb) {
d1c3a37c
JB		 1773 int align __maybe_unused;
1774
59d9cb07 1775#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1776 /*
1777 * 'align' will only take the values 0 or 2 here
1778 * since all frames are required to be aligned
1779 * to 2-byte boundaries when being passed to
1780 * mac80211. That also explains the __skb_push()
1781 * below.
1782 */
dacb6f1d 1783 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1784 if (align) {
1785 if (WARN_ON(skb_headroom(skb) < 3)) {
1786 dev_kfree_skb(skb);
1787 skb = NULL;
1788 } else {
1789 u8 *data = skb->data;
8ce0b589
ZY		 1790 size_t len = skb_headlen(skb);
1791 skb->data -= align;
1792 memmove(skb->data, data, len);
1793 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1794 }
1795 }
1796#endif
1797
1798 if (skb) {
1799 /* deliver to local stack */
1800 skb->protocol = eth_type_trans(skb, dev);
1801 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1802 netif_receive_skb(skb);
d1c3a37c 1803 }
571ecf67
JB		 1804 }
1805
76ee65bf 1806 if (xmit_skb) {
aef6c928
HS		 1807 /*
1808 * Send to wireless media and increase priority by 256 to
1809 * keep the received priority instead of reclassifying
1810 * the frame (see cfg80211_classify8021d).
1811 */
1812 xmit_skb->priority += 256;
f831e909 1813 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1814 skb_reset_network_header(xmit_skb);
1815 skb_reset_mac_header(xmit_skb);
76ee65bf 1816 dev_queue_xmit(xmit_skb);
571ecf67 1817 }
76ee65bf
RR		 1818}
1819
49461622 1820static ieee80211_rx_result debug_noinline
5cf121c3 1821ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1822{
eb9fb5b8 1823 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1824 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1826 __le16 fc = hdr->frame_control;
eaf85ca7 1827 struct sk_buff_head frame_list;
554891e6 1828 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1829
358c8d9d 1830 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1831 return RX_CONTINUE;
fd4c7f2f 1832
358c8d9d 1833 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1834 return RX_DROP_MONITOR;
fd4c7f2f 1835
554891e6 1836 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1837 return RX_CONTINUE;
fd4c7f2f 1838
eaf85ca7
ZY		 1839 if (ieee80211_has_a4(hdr->frame_control) &&
1840 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1841 !rx->sdata->u.vlan.sta)
e4c26add 1842 return RX_DROP_UNUSABLE;
fd4c7f2f 1843
eaf85ca7
ZY		 1844 if (is_multicast_ether_addr(hdr->addr1) &&
1845 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1846 rx->sdata->u.vlan.sta) ||
1847 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1848 rx->sdata->u.mgd.use_4addr)))
e4c26add 1849 return RX_DROP_UNUSABLE;
fd4c7f2f 1850
eaf85ca7
ZY		 1851 skb->dev = dev;
1852 __skb_queue_head_init(&frame_list);
fd4c7f2f 1853
e3cf8b3f
ZY		 1854 if (skb_linearize(skb))
1855 return RX_DROP_UNUSABLE;
1856
eaf85ca7
ZY		 1857 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1858 rx->sdata->vif.type,
8b3becad 1859 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1860
eaf85ca7
ZY		 1861 while (!skb_queue_empty(&frame_list)) {
1862 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1863
358c8d9d 1864 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1865 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1866 continue;
1867 }
eaf85ca7
ZY		 1868 dev->stats.rx_packets++;
1869 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1870
1871 ieee80211_deliver_skb(rx);
1872 }
1873
9ae54c84 1874 return RX_QUEUED;
fd4c7f2f
RR		 1875}
1876
bf94e17b 1877#ifdef CONFIG_MAC80211_MESH
b0dee578 1878static ieee80211_rx_result
e32f85f7
LCC		 1879ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1880{
30789eb6
TP		 1881 struct ieee80211_hdr *fwd_hdr, *hdr;
1882 struct ieee80211_tx_info *info;
e32f85f7 1883 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1884 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1885 struct ieee80211_local *local = rx->local;
eb9fb5b8 1886 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1887 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1888 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1889 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1890 u16 q, hdrlen;
e32f85f7
LCC		 1891
1892 hdr = (struct ieee80211_hdr *) skb->data;
1893 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1894 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1895
2157fdd6
TP		 1896 /* frame is in RMC, don't forward */
1897 if (ieee80211_is_data(hdr->frame_control) &&
1898 is_multicast_ether_addr(hdr->addr1) &&
1899 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1900 return RX_DROP_MONITOR;
1901
e32f85f7
LCC		 1902 if (!ieee80211_is_data(hdr->frame_control))
1903 return RX_CONTINUE;
1904
1905 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1906 return RX_DROP_MONITOR;
1907
43b7b314 1908 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1909 struct mesh_path *mppath;
43b7b314
JC		 1910 char *proxied_addr;
1911 char *mpp_addr;
1912
1913 if (is_multicast_ether_addr(hdr->addr1)) {
1914 mpp_addr = hdr->addr3;
1915 proxied_addr = mesh_hdr->eaddr1;
1916 } else {
1917 mpp_addr = hdr->addr4;
1918 proxied_addr = mesh_hdr->eaddr2;
1919 }
79617dee 1920
79617dee 1921 rcu_read_lock();
43b7b314 1922 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1923 if (!mppath) {
43b7b314 1924 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1925 } else {
1926 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1927 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1928 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1929 spin_unlock_bh(&mppath->state_lock);
1930 }
1931 rcu_read_unlock();
1932 }
1933
3c5772a5
JC		 1934 /* Frame has reached destination. Don't forward */
1935 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1936 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1937 return RX_CONTINUE;
1938
d3c1597b
TP		 1939 q = ieee80211_select_queue_80211(local, skb, hdr);
1940 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1941 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1942 return RX_DROP_MONITOR;
1943 }
1944 skb_set_queue_mapping(skb, q);
e32f85f7 1945
30789eb6
TP		 1946 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1947 goto out;
c8a61a7d 1948
30789eb6
TP		 1949 if (!--mesh_hdr->ttl) {
1950 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1951 return RX_DROP_MONITOR;
1952 }
1953
d665508b
CYY		 1954 if (!ifmsh->mshcfg.dot11MeshForwarding)
1955 goto out;
1956
30789eb6
TP		 1957 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1958 if (!fwd_skb) {
1959 if (net_ratelimit())
1960 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1961 sdata->name);
1962 goto out;
1963 }
1964
1965 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1966 info = IEEE80211_SKB_CB(fwd_skb);
1967 memset(info, 0, sizeof(*info));
1968 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1969 info->control.vif = &rx->sdata->vif;
1970 info->control.jiffies = jiffies;
1971 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1972 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1973 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1974 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1975 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1976 } else {
1977 /* unable to resolve next hop */
1978 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1979 0, reason, fwd_hdr->addr2, sdata);
1980 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1981 kfree_skb(fwd_skb);
30789eb6 1982 return RX_DROP_MONITOR;
e32f85f7
LCC		 1983 }
1984
30789eb6
TP		 1985 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1986 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1987 out:
3c5772a5 1988 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1989 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1990 return RX_CONTINUE;
1991 else
1992 return RX_DROP_MONITOR;
1993}
bf94e17b 1994#endif
e32f85f7 1995
49461622 1996static ieee80211_rx_result debug_noinline
5cf121c3 1997ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1998{
eb9fb5b8 1999 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2000 struct ieee80211_local *local = rx->local;
eb9fb5b8 2001 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2002 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2003 __le16 fc = hdr->frame_control;
4114fa21 2004 bool port_control;
ce3edf6d 2005 int err;
76ee65bf 2006
358c8d9d 2007 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2008 return RX_CONTINUE;
76ee65bf 2009
358c8d9d 2010 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2011 return RX_DROP_MONITOR;
76ee65bf 2012
f14543ee 2013 /*
e7f4a940
JB		 2014 * Send unexpected-4addr-frame event to hostapd. For older versions,
2015 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2016 */
2017 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2018 sdata->vif.type == NL80211_IFTYPE_AP) {
2019 if (rx->sta &&
2020 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2021 cfg80211_rx_unexpected_4addr_frame(
2022 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2023 return RX_DROP_MONITOR;
e7f4a940 2024 }
f14543ee 2025
4114fa21 2026 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2027 if (unlikely(err))
e4c26add 2028 return RX_DROP_UNUSABLE;
76ee65bf 2029
358c8d9d 2030 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2031 return RX_DROP_MONITOR;
ce3edf6d 2032
4114fa21
FF		 2033 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2034 unlikely(port_control) && sdata->bss) {
2035 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2036 u.ap);
2037 dev = sdata->dev;
2038 rx->sdata = sdata;
2039 }
2040
76ee65bf
RR		 2041 rx->skb->dev = dev;
2042
2043 dev->stats.rx_packets++;
2044 dev->stats.rx_bytes += rx->skb->len;
2045
08ca944e 2046 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2047 !is_multicast_ether_addr(
2048 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2049 (!local->scanning &&
2050 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2051 mod_timer(&local->dynamic_ps_timer, jiffies +
2052 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2053 }
2054
76ee65bf 2055 ieee80211_deliver_skb(rx);
571ecf67 2056
9ae54c84 2057 return RX_QUEUED;
571ecf67
JB		 2058}
2059
49461622 2060static ieee80211_rx_result debug_noinline
24a8fdad 2061ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2062{
2063 struct ieee80211_local *local = rx->local;
2064 struct ieee80211_hw *hw = &local->hw;
2065 struct sk_buff *skb = rx->skb;
a7767f95 2066 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2067 struct tid_ampdu_rx *tid_agg_rx;
2068 u16 start_seq_num;
2069 u16 tid;
2070
a7767f95 2071 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2072 return RX_CONTINUE;
71364716 2073
a7767f95 2074 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2075 struct {
2076 __le16 control, start_seq_num;
2077 } __packed bar_data;
2078
71364716 2079 if (!rx->sta)
a02ae758 2080 return RX_DROP_MONITOR;
8ae5977f
JB		 2081
2082 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2083 &bar_data, sizeof(bar_data)))
2084 return RX_DROP_MONITOR;
2085
8ae5977f 2086 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2087
2088 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2089 if (!tid_agg_rx)
a02ae758 2090 return RX_DROP_MONITOR;
71364716 2091
8ae5977f 2092 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2093
2094 /* reset session timer */
20ad19d0
JB		 2095 if (tid_agg_rx->timeout)
2096 mod_timer(&tid_agg_rx->session_timer,
2097 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2098
dd318575 2099 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2100 /* release stored frames up to start of BAR */
24a8fdad 2101 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2102 spin_unlock(&tid_agg_rx->reorder_lock);
2103
a02ae758
JB		 2104 kfree_skb(skb);
2105 return RX_QUEUED;
71364716
RR		 2106 }
2107
08daecae
JB		 2108 /*
2109 * After this point, we only want management frames,
2110 * so we can drop all remaining control frames to
2111 * cooked monitor interfaces.
2112 */
2113 return RX_DROP_MONITOR;
71364716
RR		 2114}
2115
f4f727a6
JM		 2116static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2117 struct ieee80211_mgmt *mgmt,
2118 size_t len)
fea14732
JM		 2119{
2120 struct ieee80211_local *local = sdata->local;
2121 struct sk_buff *skb;
2122 struct ieee80211_mgmt *resp;
2123
47846c9b 2124 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2125 /* Not to own unicast address */
2126 return;
2127 }
2128
46900298
JB		 2129 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2130 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2131 /* Not from the current AP or not associated yet. */
fea14732
JM		 2132 return;
2133 }
2134
2135 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2136 /* Too short SA Query request frame */
2137 return;
2138 }
2139
2140 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2141 if (skb == NULL)
2142 return;
2143
2144 skb_reserve(skb, local->hw.extra_tx_headroom);
2145 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2146 memset(resp, 0, 24);
2147 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2148 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2149 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2150 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2151 IEEE80211_STYPE_ACTION);
2152 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2153 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2154 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2155 memcpy(resp->u.action.u.sa_query.trans_id,
2156 mgmt->u.action.u.sa_query.trans_id,
2157 WLAN_SA_QUERY_TR_ID_LEN);
2158
62ae67be 2159 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2160}
2161
2e161f78
JB		 2162static ieee80211_rx_result debug_noinline
2163ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2164{
2165 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2166 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2167
2168 /*
2169 * From here on, look only at management frames.
2170 * Data and control frames are already handled,
2171 * and unknown (reserved) frames are useless.
2172 */
2173 if (rx->skb->len < 24)
2174 return RX_DROP_MONITOR;
2175
2176 if (!ieee80211_is_mgmt(mgmt->frame_control))
2177 return RX_DROP_MONITOR;
2178
ee971924
JB		 2179 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2180 ieee80211_is_beacon(mgmt->frame_control) &&
2181 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2182 int sig = 0;
2183
2184 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2185 sig = status->signal;
2186
ee971924
JB		 2187 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2188 rx->skb->data, rx->skb->len,
804483e9 2189 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2190 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2191 }
2192
554891e6 2193 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2194 return RX_DROP_MONITOR;
2195
2196 if (ieee80211_drop_unencrypted_mgmt(rx))
2197 return RX_DROP_UNUSABLE;
2198
2199 return RX_CONTINUE;
2200}
2201
de1ede7a
JB		 2202static ieee80211_rx_result debug_noinline
2203ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2204{
2205 struct ieee80211_local *local = rx->local;
eb9fb5b8 2206 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2207 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2208 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2209 int len = rx->skb->len;
2210
2211 if (!ieee80211_is_action(mgmt->frame_control))
2212 return RX_CONTINUE;
2213
026331c4
JM		 2214 /* drop too small frames */
2215 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2216 return RX_DROP_UNUSABLE;
de1ede7a 2217
026331c4 2218 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2219 return RX_DROP_UNUSABLE;
de1ede7a 2220
554891e6 2221 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2222 return RX_DROP_UNUSABLE;
97ebe12a 2223
de1ede7a 2224 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2225 case WLAN_CATEGORY_HT:
2226 /* reject HT action frames from stations not supporting HT */
2227 if (!rx->sta->sta.ht_cap.ht_supported)
2228 goto invalid;
2229
2230 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2231 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2232 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2233 sdata->vif.type != NL80211_IFTYPE_AP &&
2234 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2235 break;
2236
2237 /* verify action & smps_control are present */
2238 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2239 goto invalid;
2240
2241 switch (mgmt->u.action.u.ht_smps.action) {
2242 case WLAN_HT_ACTION_SMPS: {
2243 struct ieee80211_supported_band *sband;
2244 u8 smps;
2245
2246 /* convert to HT capability */
2247 switch (mgmt->u.action.u.ht_smps.smps_control) {
2248 case WLAN_HT_SMPS_CONTROL_DISABLED:
2249 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2250 break;
2251 case WLAN_HT_SMPS_CONTROL_STATIC:
2252 smps = WLAN_HT_CAP_SM_PS_STATIC;
2253 break;
2254 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2255 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2256 break;
2257 default:
2258 goto invalid;
2259 }
2260 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2261
2262 /* if no change do nothing */
2263 if ((rx->sta->sta.ht_cap.cap &
2264 IEEE80211_HT_CAP_SM_PS) == smps)
2265 goto handled;
2266
2267 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2268 rx->sta->sta.ht_cap.cap |= smps;
2269
2270 sband = rx->local->hw.wiphy->bands[status->band];
2271
3117bbdb
PS		 2272 rate_control_rate_update(
2273 local, sband, rx->sta,
2274 IEEE80211_RC_SMPS_CHANGED,
2275 ieee80211_get_tx_channel_type(
2276 local, local->_oper_channel_type));
1d8d3dec
JB		 2277 goto handled;
2278 }
2279 default:
2280 goto invalid;
2281 }
2282
2283 break;
de1ede7a 2284 case WLAN_CATEGORY_BACK:
8abd3f9b 2285 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2286 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2287 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2288 sdata->vif.type != NL80211_IFTYPE_AP &&
2289 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2290 break;
8abd3f9b 2291
026331c4
JM		 2292 /* verify action_code is present */
2293 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2294 break;
2295
de1ede7a
JB		 2296 switch (mgmt->u.action.u.addba_req.action_code) {
2297 case WLAN_ACTION_ADDBA_REQ:
2298 if (len < (IEEE80211_MIN_ACTION_SIZE +
2299 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2300 goto invalid;
2301 break;
de1ede7a
JB		 2302 case WLAN_ACTION_ADDBA_RESP:
2303 if (len < (IEEE80211_MIN_ACTION_SIZE +
2304 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2305 goto invalid;
2306 break;
de1ede7a
JB		 2307 case WLAN_ACTION_DELBA:
2308 if (len < (IEEE80211_MIN_ACTION_SIZE +
2309 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2310 goto invalid;
2311 break;
2312 default:
2313 goto invalid;
de1ede7a 2314 }
bed7ee6e 2315
8b58ff83 2316 goto queue;
39192c0b
JB		 2317 case WLAN_CATEGORY_SPECTRUM_MGMT:
2318 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2319 break;
46900298
JB		 2320
2321 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2322 break;
46900298 2323
026331c4
JM		 2324 /* verify action_code is present */
2325 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2326 break;
2327
39192c0b
JB		 2328 switch (mgmt->u.action.u.measurement.action_code) {
2329 case WLAN_ACTION_SPCT_MSR_REQ:
2330 if (len < (IEEE80211_MIN_ACTION_SIZE +
2331 sizeof(mgmt->u.action.u.measurement)))
84040805 2332 break;
39192c0b 2333 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2334 goto handled;
c481ec97
S		 2335 case WLAN_ACTION_SPCT_CHL_SWITCH:
2336 if (len < (IEEE80211_MIN_ACTION_SIZE +
2337 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2338 break;
c481ec97 2339
cc32abd4 2340 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2341 break;
cc32abd4 2342
888d04df 2343 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2344 break;
c481ec97 2345
8b58ff83 2346 goto queue;
39192c0b
JB		 2347 }
2348 break;
fea14732
JM		 2349 case WLAN_CATEGORY_SA_QUERY:
2350 if (len < (IEEE80211_MIN_ACTION_SIZE +
2351 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2352 break;
2353
fea14732
JM		 2354 switch (mgmt->u.action.u.sa_query.action) {
2355 case WLAN_ACTION_SA_QUERY_REQUEST:
2356 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2357 break;
fea14732 2358 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2359 goto handled;
fea14732
JM		 2360 }
2361 break;
8db09850
TP		 2362 case WLAN_CATEGORY_SELF_PROTECTED:
2363 switch (mgmt->u.action.u.self_prot.action_code) {
2364 case WLAN_SP_MESH_PEERING_OPEN:
2365 case WLAN_SP_MESH_PEERING_CLOSE:
2366 case WLAN_SP_MESH_PEERING_CONFIRM:
2367 if (!ieee80211_vif_is_mesh(&sdata->vif))
2368 goto invalid;
2369 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2370 /* userspace handles this frame */
2371 break;
2372 goto queue;
2373 case WLAN_SP_MGK_INFORM:
2374 case WLAN_SP_MGK_ACK:
2375 if (!ieee80211_vif_is_mesh(&sdata->vif))
2376 goto invalid;
2377 break;
2378 }
2379 break;
d3aaec8a 2380 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2381 if (!ieee80211_vif_is_mesh(&sdata->vif))
2382 break;
25d49e4d
TP		 2383 if (mesh_action_is_path_sel(mgmt) &&
2384 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2385 break;
2386 goto queue;
84040805 2387 }
026331c4 2388
2e161f78
JB		 2389 return RX_CONTINUE;
2390
bed7ee6e 2391 invalid:
554891e6 2392 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2393 /* will return in the next handlers */
2394 return RX_CONTINUE;
2395
2396 handled:
2397 if (rx->sta)
2398 rx->sta->rx_packets++;
2399 dev_kfree_skb(rx->skb);
2400 return RX_QUEUED;
2401
2402 queue:
2403 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2404 skb_queue_tail(&sdata->skb_queue, rx->skb);
2405 ieee80211_queue_work(&local->hw, &sdata->work);
2406 if (rx->sta)
2407 rx->sta->rx_packets++;
2408 return RX_QUEUED;
2409}
2410
2411static ieee80211_rx_result debug_noinline
2412ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2413{
554891e6 2414 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2415 int sig = 0;
2e161f78
JB		 2416
2417 /* skip known-bad action frames and return them in the next handler */
554891e6 2418 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2419 return RX_CONTINUE;
d7907448 2420
026331c4
JM		 2421 /*
2422 * Getting here means the kernel doesn't know how to handle
2423 * it, but maybe userspace does ... include returned frames
2424 * so userspace can register for those to know whether ones
2425 * it transmitted were processed or returned.
2426 */
026331c4 2427
804483e9
JB		 2428 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2429 sig = status->signal;
2430
2431 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2e161f78
JB		 2432 rx->skb->data, rx->skb->len,
2433 GFP_ATOMIC)) {
2434 if (rx->sta)
2435 rx->sta->rx_packets++;
2436 dev_kfree_skb(rx->skb);
2437 return RX_QUEUED;
2438 }
2439
2440
2441 return RX_CONTINUE;
2442}
2443
2444static ieee80211_rx_result debug_noinline
2445ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2446{
2447 struct ieee80211_local *local = rx->local;
2448 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2449 struct sk_buff *nskb;
2450 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2451 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2452
2453 if (!ieee80211_is_action(mgmt->frame_control))
2454 return RX_CONTINUE;
2455
2456 /*
2457 * For AP mode, hostapd is responsible for handling any action
2458 * frames that we didn't handle, including returning unknown
2459 * ones. For all other modes we will return them to the sender,
2460 * setting the 0x80 bit in the action category, as required by
2461 * 802.11-2007 7.3.1.11.
2462 * Newer versions of hostapd shall also use the management frame
2463 * registration mechanisms, but older ones still use cooked
2464 * monitor interfaces so push all frames there.
2465 */
554891e6 2466 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2467 (sdata->vif.type == NL80211_IFTYPE_AP ||
2468 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2469 return RX_DROP_MONITOR;
026331c4 2470
84040805
JB		 2471 /* do not return rejected action frames */
2472 if (mgmt->u.action.category & 0x80)
2473 return RX_DROP_UNUSABLE;
2474
2475 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2476 GFP_ATOMIC);
2477 if (nskb) {
292b4df6 2478 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2479
292b4df6
JL		 2480 nmgmt->u.action.category |= 0x80;
2481 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2482 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2483
2484 memset(nskb->cb, 0, sizeof(nskb->cb));
2485
2486 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2487 }
39192c0b
JB		 2488 dev_kfree_skb(rx->skb);
2489 return RX_QUEUED;
de1ede7a
JB		 2490}
2491
49461622 2492static ieee80211_rx_result debug_noinline
5cf121c3 2493ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2494{
eb9fb5b8 2495 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2496 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2497 __le16 stype;
571ecf67 2498
77a121c3 2499 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2500
77a121c3
JB		 2501 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2502 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2503 sdata->vif.type != NL80211_IFTYPE_STATION)
2504 return RX_DROP_MONITOR;
472dbc45 2505
77a121c3 2506 switch (stype) {
66e67e41 2507 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2508 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2509 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2510 /* process for all: mesh, mlme, ibss */
2511 break;
66e67e41
JB		 2512 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2513 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2514 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2515 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2516 if (is_multicast_ether_addr(mgmt->da) &&
2517 !is_broadcast_ether_addr(mgmt->da))
2518 return RX_DROP_MONITOR;
2519
77a121c3
JB		 2520 /* process only for station */
2521 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2522 return RX_DROP_MONITOR;
2523 break;
2524 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2525 /* process only for ibss */
2526 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2527 return RX_DROP_MONITOR;
2528 break;
2529 default:
2530 return RX_DROP_MONITOR;
2531 }
f9d540ee 2532
77a121c3 2533 /* queue up frame and kick off work to process it */
c1475ca9 2534 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2535 skb_queue_tail(&sdata->skb_queue, rx->skb);
2536 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2537 if (rx->sta)
2538 rx->sta->rx_packets++;
46900298 2539
77a121c3 2540 return RX_QUEUED;
571ecf67
JB		 2541}
2542
5cf121c3 2543/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2544static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2545 struct ieee80211_rate *rate)
3d30d949
MW		 2546{
2547 struct ieee80211_sub_if_data *sdata;
2548 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2549 struct sk_buff *skb = rx->skb, *skb2;
2550 struct net_device *prev_dev = NULL;
eb9fb5b8 2551 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2552 int needed_headroom;
3d30d949 2553
554891e6
JB		 2554 /*
2555 * If cooked monitor has been processed already, then
2556 * don't do it again. If not, set the flag.
2557 */
2558 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2559 goto out_free_skb;
554891e6 2560 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2561
152c477a
JB		 2562 /* If there are no cooked monitor interfaces, just free the SKB */
2563 if (!local->cooked_mntrs)
2564 goto out_free_skb;
2565
293702a3
JB		 2566 /* room for the radiotap header based on driver features */
2567 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2568
293702a3
JB		 2569 if (skb_headroom(skb) < needed_headroom &&
2570 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2571 goto out_free_skb;
3d30d949 2572
293702a3
JB		 2573 /* prepend radiotap information */
2574 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
3d30d949
MW		 2575
2576 skb_set_mac_header(skb, 0);
2577 skb->ip_summed = CHECKSUM_UNNECESSARY;
2578 skb->pkt_type = PACKET_OTHERHOST;
2579 skb->protocol = htons(ETH_P_802_2);
2580
2581 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2582 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2583 continue;
2584
05c914fe 2585 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2586 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2587 continue;
2588
2589 if (prev_dev) {
2590 skb2 = skb_clone(skb, GFP_ATOMIC);
2591 if (skb2) {
2592 skb2->dev = prev_dev;
5548a8a1 2593 netif_receive_skb(skb2);
3d30d949
MW		 2594 }
2595 }
2596
2597 prev_dev = sdata->dev;
2598 sdata->dev->stats.rx_packets++;
2599 sdata->dev->stats.rx_bytes += skb->len;
2600 }
2601
2602 if (prev_dev) {
2603 skb->dev = prev_dev;
5548a8a1 2604 netif_receive_skb(skb);
554891e6
JB		 2605 return;
2606 }
3d30d949
MW		 2607
2608 out_free_skb:
2609 dev_kfree_skb(skb);
2610}
2611
aa0c8636
CL		 2612static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2613 ieee80211_rx_result res)
2614{
2615 switch (res) {
2616 case RX_DROP_MONITOR:
2617 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2618 if (rx->sta)
2619 rx->sta->rx_dropped++;
2620 /* fall through */
2621 case RX_CONTINUE: {
2622 struct ieee80211_rate *rate = NULL;
2623 struct ieee80211_supported_band *sband;
2624 struct ieee80211_rx_status *status;
2625
2626 status = IEEE80211_SKB_RXCB((rx->skb));
2627
2628 sband = rx->local->hw.wiphy->bands[status->band];
2629 if (!(status->flag & RX_FLAG_HT))
2630 rate = &sband->bitrates[status->rate_idx];
2631
2632 ieee80211_rx_cooked_monitor(rx, rate);
2633 break;
2634 }
2635 case RX_DROP_UNUSABLE:
2636 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2637 if (rx->sta)
2638 rx->sta->rx_dropped++;
2639 dev_kfree_skb(rx->skb);
2640 break;
2641 case RX_QUEUED:
2642 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2643 break;
2644 }
2645}
571ecf67 2646
24a8fdad 2647static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2648{
58905290 2649 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2650 struct sk_buff *skb;
8944b79f 2651
e32f85f7
LCC		 2652#define CALL_RXH(rxh) \
2653 do { \
2654 res = rxh(rx); \
2655 if (res != RX_CONTINUE) \
2569a826 2656 goto rxh_next; \
e32f85f7 2657 } while (0);
49461622 2658
24a8fdad
CL		 2659 spin_lock(&rx->local->rx_skb_queue.lock);
2660 if (rx->local->running_rx_handler)
2661 goto unlock;
2662
2663 rx->local->running_rx_handler = true;
2664
2665 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2666 spin_unlock(&rx->local->rx_skb_queue.lock);
2667
2569a826
JB		 2668 /*
2669 * all the other fields are valid across frames
2670 * that belong to an aMPDU since they are on the
2671 * same TID from the same station
2672 */
2673 rx->skb = skb;
2674
2675 CALL_RXH(ieee80211_rx_h_decrypt)
2676 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2677 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2678 CALL_RXH(ieee80211_rx_h_sta_process)
2679 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2680 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2681 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2682#ifdef CONFIG_MAC80211_MESH
aa0c8636 2683 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2684 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2685#endif
2154c81c 2686 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2687 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2688 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2689 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2690 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2691 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2692 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2693 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2694
aa0c8636
CL		 2695 rxh_next:
2696 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2697 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2698#undef CALL_RXH
aa0c8636 2699 }
24a8fdad
CL		 2700
2701 rx->local->running_rx_handler = false;
2702
2703 unlock:
2704 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2705}
2706
4406c376 2707static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2708{
aa0c8636
CL		 2709 ieee80211_rx_result res = RX_DROP_MONITOR;
2710
aa0c8636
CL		 2711#define CALL_RXH(rxh) \
2712 do { \
2713 res = rxh(rx); \
2714 if (res != RX_CONTINUE) \
2715 goto rxh_next; \
2716 } while (0);
2717
2718 CALL_RXH(ieee80211_rx_h_passive_scan)
2719 CALL_RXH(ieee80211_rx_h_check)
2720
24a8fdad 2721 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2722
24a8fdad 2723 ieee80211_rx_handlers(rx);
aa0c8636 2724 return;
49461622 2725
2569a826 2726 rxh_next:
aa0c8636
CL		 2727 ieee80211_rx_handlers_result(rx, res);
2728
2729#undef CALL_RXH
58905290
JB		 2730}
2731
2bff8ebf 2732/*
dd318575
JB		 2733 * This function makes calls into the RX path, therefore
2734 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2735 */
2736void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2737{
554891e6
JB		 2738 struct ieee80211_rx_data rx = {
2739 .sta = sta,
2740 .sdata = sta->sdata,
2741 .local = sta->local,
9e26297a
JB		 2742 /* This is OK -- must be QoS data frame */
2743 .security_idx = tid,
2744 .seqno_idx = tid,
fcf8bd3b 2745 .flags = 0,
554891e6 2746 };
2c15a0cf
CL		 2747 struct tid_ampdu_rx *tid_agg_rx;
2748
2749 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2750 if (!tid_agg_rx)
2751 return;
2bff8ebf 2752
2c15a0cf 2753 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2754 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2755 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2756
24a8fdad 2757 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2758}
2759
571ecf67
JB		 2760/* main receive path */
2761
20b01f80 2762static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2763 struct ieee80211_hdr *hdr)
2764{
20b01f80 2765 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2766 struct sk_buff *skb = rx->skb;
2767 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2768 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2769 int multicast = is_multicast_ether_addr(hdr->addr1);
2770
51fb61e7 2771 switch (sdata->vif.type) {
05c914fe 2772 case NL80211_IFTYPE_STATION:
9bc383de 2773 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2774 return 0;
77fdaa12 2775 if (!multicast &&
47846c9b 2776 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2777 if (!(sdata->dev->flags & IFF_PROMISC) ||
2778 sdata->u.mgd.use_4addr)
23a24def 2779 return 0;
554891e6 2780 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2781 }
2782 break;
05c914fe 2783 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2784 if (!bssid)
2785 return 0;
a7767f95 2786 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2787 return 1;
87291c02 2788 }
46900298 2789 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2790 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2791 return 0;
554891e6 2792 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2793 } else if (!multicast &&
47846c9b 2794 compare_ether_addr(sdata->vif.addr,
23a24def 2795 hdr->addr1) != 0) {
4150c572 2796 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2797 return 0;
554891e6 2798 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2799 } else if (!rx->sta) {
2800 int rate_idx;
eb9fb5b8 2801 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2802 rate_idx = 0; /* TODO: HT rates */
2803 else
eb9fb5b8 2804 rate_idx = status->rate_idx;
8bf11d8d
JB		 2805 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2806 BIT(rate_idx));
0fb8ca45 2807 }
23a24def 2808 break;
05c914fe 2809 case NL80211_IFTYPE_MESH_POINT:
6032f934 2810 if (!multicast &&
47846c9b 2811 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2812 hdr->addr1) != 0) {
2813 if (!(sdata->dev->flags & IFF_PROMISC))
2814 return 0;
2815
554891e6 2816 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2817 }
2818 break;
05c914fe
JB		 2819 case NL80211_IFTYPE_AP_VLAN:
2820 case NL80211_IFTYPE_AP:
23a24def 2821 if (!bssid) {
47846c9b 2822 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2823 hdr->addr1))
2824 return 0;
2825 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2826 sdata->vif.addr)) {
3df6eaea
JB		 2827 /*
2828 * Accept public action frames even when the
2829 * BSSID doesn't match, this is used for P2P
2830 * and location updates. Note that mac80211
2831 * itself never looks at these frames.
2832 */
2833 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2834 ieee80211_is_public_action(hdr, skb->len))
2835 return 1;
771bbd09 2836 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
3df6eaea 2837 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2838 return 0;
554891e6 2839 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2840 }
23a24def 2841 break;
05c914fe 2842 case NL80211_IFTYPE_WDS:
a7767f95 2843 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2844 return 0;
2845 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2846 return 0;
2847 break;
2ca27bcf 2848 default:
fb1c1cd6
JB		 2849 /* should never get here */
2850 WARN_ON(1);
2851 break;
23a24def
JB		 2852 }
2853
2854 return 1;
2855}
2856
4406c376
JB		 2857/*
2858 * This function returns whether or not the SKB
2859 * was destined for RX processing or not, which,
2860 * if consume is true, is equivalent to whether
2861 * or not the skb was consumed.
2862 */
2863static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2864 struct sk_buff *skb, bool consume)
2865{
2866 struct ieee80211_local *local = rx->local;
2867 struct ieee80211_sub_if_data *sdata = rx->sdata;
2868 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2869 struct ieee80211_hdr *hdr = (void *)skb->data;
2870 int prepares;
2871
2872 rx->skb = skb;
554891e6 2873 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2874 prepares = prepare_for_handlers(rx, hdr);
2875
2876 if (!prepares)
2877 return false;
2878
4406c376
JB		 2879 if (!consume) {
2880 skb = skb_copy(skb, GFP_ATOMIC);
2881 if (!skb) {
2882 if (net_ratelimit())
2883 wiphy_debug(local->hw.wiphy,
b305dae4 2884 "failed to copy skb for %s\n",
4406c376
JB		 2885 sdata->name);
2886 return true;
2887 }
2888
2889 rx->skb = skb;
2890 }
2891
2892 ieee80211_invoke_rx_handlers(rx);
2893 return true;
2894}
2895
571ecf67 2896/*
6368e4b1
RR		 2897 * This is the actual Rx frames handler. as it blongs to Rx path it must
2898 * be called with rcu_read_lock protection.
571ecf67 2899 */
71ebb4aa 2900static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2901 struct sk_buff *skb)
571ecf67 2902{
554891e6 2903 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2904 struct ieee80211_local *local = hw_to_local(hw);
2905 struct ieee80211_sub_if_data *sdata;
571ecf67 2906 struct ieee80211_hdr *hdr;
e3cf8b3f 2907 __le16 fc;
5cf121c3 2908 struct ieee80211_rx_data rx;
4406c376 2909 struct ieee80211_sub_if_data *prev;
56af3268 2910 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2911 int err = 0;
571ecf67 2912
e3cf8b3f 2913 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2914 memset(&rx, 0, sizeof(rx));
2915 rx.skb = skb;
2916 rx.local = local;
72abd81b 2917
e3cf8b3f 2918 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2919 local->dot11ReceivedFragmentCount++;
571ecf67 2920
142b9f50 2921 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2922 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2923 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2924
e3cf8b3f
ZY		 2925 if (ieee80211_is_mgmt(fc))
2926 err = skb_linearize(skb);
2927 else
2928 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2929
2930 if (err) {
2931 dev_kfree_skb(skb);
2932 return;
2933 }
2934
2935 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2936 ieee80211_parse_qos(&rx);
d1c3a37c 2937 ieee80211_verify_alignment(&rx);
38f3714d 2938
e3cf8b3f 2939 if (ieee80211_is_data(fc)) {
56af3268 2940 prev_sta = NULL;
4406c376 2941
7852e361 2942 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2943 if (!prev_sta) {
2944 prev_sta = sta;
2945 continue;
2946 }
2947
2948 rx.sta = prev_sta;
2949 rx.sdata = prev_sta->sdata;
4406c376 2950 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2951
56af3268 2952 prev_sta = sta;
4406c376 2953 }
56af3268
BG		 2954
2955 if (prev_sta) {
2956 rx.sta = prev_sta;
2957 rx.sdata = prev_sta->sdata;
2958
4406c376 2959 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2960 return;
8e26d5ad 2961 goto out;
56af3268 2962 }
4406c376
JB		 2963 }
2964
4b0dd98e 2965 prev = NULL;
b2e7771e 2966
4b0dd98e
JB		 2967 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2968 if (!ieee80211_sdata_running(sdata))
2969 continue;
340e11f3 2970
4b0dd98e
JB		 2971 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2972 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2973 continue;
340e11f3 2974
4b0dd98e
JB		 2975 /*
2976 * frame is destined for this interface, but if it's
2977 * not also for the previous one we handle that after
2978 * the loop to avoid copying the SKB once too much
2979 */
4bb29f8c 2980
4b0dd98e 2981 if (!prev) {
abe60632 2982 prev = sdata;
4b0dd98e 2983 continue;
340e11f3 2984 }
4bb29f8c 2985
7852e361 2986 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2987 rx.sdata = prev;
2988 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2989
4b0dd98e
JB		 2990 prev = sdata;
2991 }
2992
2993 if (prev) {
7852e361 2994 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2995 rx.sdata = prev;
4406c376 2996
4b0dd98e
JB		 2997 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2998 return;
571ecf67 2999 }
4406c376 3000
8e26d5ad 3001 out:
4406c376 3002 dev_kfree_skb(skb);
571ecf67 3003}
6368e4b1
RR		 3004
3005/*
3006 * This is the receive path handler. It is called by a low level driver when an
3007 * 802.11 MPDU is received from the hardware.
3008 */
103bf9f7 3009void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3010{
3011 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3012 struct ieee80211_rate *rate = NULL;
3013 struct ieee80211_supported_band *sband;
f1d58c25 3014 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3015
d20ef63d
JB		 3016 WARN_ON_ONCE(softirq_count() == 0);
3017
77a980dc
JB		 3018 if (WARN_ON(status->band < 0 ||
3019 status->band >= IEEE80211_NUM_BANDS))
3020 goto drop;
8318d78a
JB		 3021
3022 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3023 if (WARN_ON(!sband))
3024 goto drop;
8318d78a 3025
89c3a8ac
JB		 3026 /*
3027 * If we're suspending, it is possible although not too likely
3028 * that we'd be receiving frames after having already partially
3029 * quiesced the stack. We can't process such frames then since
3030 * that might, for example, cause stations to be added or other
3031 * driver callbacks be invoked.
3032 */
77a980dc
JB		 3033 if (unlikely(local->quiescing || local->suspended))
3034 goto drop;
89c3a8ac 3035
ea77f12f
JB		 3036 /*
3037 * The same happens when we're not even started,
3038 * but that's worth a warning.
3039 */
77a980dc
JB		 3040 if (WARN_ON(!local->started))
3041 goto drop;
ea77f12f 3042
fc885189 3043 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3044 /*
fc885189
JB		 3045 * Validate the rate, unless a PLCP error means that
3046 * we probably can't have a valid rate here anyway.
e5d6eb83 3047 */
fc885189
JB		 3048
3049 if (status->flag & RX_FLAG_HT) {
3050 /*
3051 * rate_idx is MCS index, which can be [0-76]
3052 * as documented on:
3053 *
3054 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3055 *
3056 * Anything else would be some sort of driver or
3057 * hardware error. The driver should catch hardware
3058 * errors.
3059 */
3060 if (WARN((status->rate_idx < 0 ||
3061 status->rate_idx > 76),
3062 "Rate marked as an HT rate but passed "
3063 "status->rate_idx is not "
3064 "an MCS index [0-76]: %d (0x%02x)\n",
3065 status->rate_idx,
3066 status->rate_idx))
3067 goto drop;
3068 } else {
3069 if (WARN_ON(status->rate_idx < 0 ||
3070 status->rate_idx >= sband->n_bitrates))
3071 goto drop;
3072 rate = &sband->bitrates[status->rate_idx];
3073 }
0fb8ca45 3074 }
6368e4b1 3075
554891e6
JB		 3076 status->rx_flags = 0;
3077
6368e4b1
RR		 3078 /*
3079 * key references and virtual interfaces are protected using RCU
3080 * and this requires that we are in a read-side RCU section during
3081 * receive processing
3082 */
3083 rcu_read_lock();
3084
3085 /*
3086 * Frames with failed FCS/PLCP checksum are not returned,
3087 * all other frames are returned without radiotap header
3088 * if it was previously present.
3089 * Also, frames with less than 16 bytes are dropped.
3090 */
f1d58c25 3091 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3092 if (!skb) {
3093 rcu_read_unlock();
3094 return;
3095 }
3096
e1e54068
JB		 3097 ieee80211_tpt_led_trig_rx(local,
3098 ((struct ieee80211_hdr *)skb->data)->frame_control,
3099 skb->len);
071d9ac2 3100 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3101
3102 rcu_read_unlock();
77a980dc
JB		 3103
3104 return;
3105 drop:
3106 kfree_skb(skb);
6368e4b1 3107}
103bf9f7 3108EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3109
3110/* This is a version of the rx handler that can be called from hard irq
3111 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3112void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3113{
3114 struct ieee80211_local *local = hw_to_local(hw);
3115
3116 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3117
571ecf67
JB		 3118 skb->pkt_type = IEEE80211_RX_MSG;
3119 skb_queue_tail(&local->skb_queue, skb);
3120 tasklet_schedule(&local->tasklet);
3121}
3122EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
This page took 0.763191 seconds and 5 git commands to generate.