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mac80211: set HT channel before association
[mirror_ubuntu-hirsute-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
e3cf8b3f 45 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
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)
12d3952f 796 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 797
798 /* if this mpdu is fragmented - terminate rx aggregation session */
799 sc = le16_to_cpu(hdr->seq_ctrl);
800 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 801 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 802 skb_queue_tail(&rx->sdata->skb_queue, skb);
803 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 804 return;
1edfb1af
JB		 805 }
806
a87f736d
JB		 807 /*
808 * No locking needed -- we will only ever process one
809 * RX packet at a time, and thus own tid_agg_rx. All
810 * other code manipulating it needs to (and does) make
811 * sure that we cannot get to it any more before doing
812 * anything with it.
813 */
24a8fdad 814 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 815 return;
816
817 dont_reorder:
24a8fdad 818 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 819}
33b64eb2 820
49461622 821static ieee80211_rx_result debug_noinline
5cf121c3 822ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 823{
a7767f95 824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 825 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 826
827 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
828 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 829 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 830 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 831 hdr->seq_ctrl)) {
554891e6 832 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 833 rx->local->dot11FrameDuplicateCount++;
834 rx->sta->num_duplicates++;
835 }
b1f93314 836 return RX_DROP_UNUSABLE;
571ecf67 837 } else
9e26297a 838 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 839 }
840
571ecf67
JB		 841 if (unlikely(rx->skb->len < 16)) {
842 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 843 return RX_DROP_MONITOR;
571ecf67
JB		 844 }
845
571ecf67
JB		 846 /* Drop disallowed frame classes based on STA auth/assoc state;
847 * IEEE 802.11, Chap 5.5.
848 *
ccd7b362
JB		 849 * mac80211 filters only based on association state, i.e. it drops
850 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 851 * deauth/disassoc frames when needed. In addition, hostapd is
852 * responsible for filtering on both auth and assoc states.
853 */
33b64eb2 854
902acc78 855 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 856 return ieee80211_rx_mesh_check(rx);
33b64eb2 857
a7767f95
HH		 858 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
859 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 860 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 861 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 862 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 863 /*
864 * accept port control frames from the AP even when it's not
865 * yet marked ASSOC to prevent a race where we don't set the
866 * assoc bit quickly enough before it sends the first frame
867 */
868 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 869 ieee80211_is_data_present(hdr->frame_control)) {
870 u16 ethertype;
871 u8 *payload;
872
873 payload = rx->skb->data +
874 ieee80211_hdrlen(hdr->frame_control);
875 ethertype = (payload[6] << 8) | payload[7];
876 if (cpu_to_be16(ethertype) ==
877 rx->sdata->control_port_protocol)
878 return RX_CONTINUE;
879 }
21fc7560
JB		 880
881 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
882 cfg80211_rx_spurious_frame(rx->sdata->dev,
883 hdr->addr2,
884 GFP_ATOMIC))
885 return RX_DROP_UNUSABLE;
886
e4c26add 887 return RX_DROP_MONITOR;
2a33bee2 888 }
571ecf67 889
9ae54c84 890 return RX_CONTINUE;
570bd537
JB		 891}
892
893
49461622 894static ieee80211_rx_result debug_noinline
5cf121c3 895ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 896{
eb9fb5b8
JB		 897 struct sk_buff *skb = rx->skb;
898 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
899 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 900 int keyidx;
901 int hdrlen;
e4c26add 902 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 903 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 904 int mmie_keyidx = -1;
761ab470 905 __le16 fc;
570bd537 906
3017b80b
JB		 907 /*
908 * Key selection 101
909 *
3cfcf6ac 910 * There are four types of keys:
3017b80b 911 * - GTK (group keys)
3cfcf6ac 912 * - IGTK (group keys for management frames)
3017b80b
JB		 913 * - PTK (pairwise keys)
914 * - STK (station-to-station pairwise keys)
915 *
916 * When selecting a key, we have to distinguish between multicast
917 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 918 * use PTKs and STKs while the former always use GTKs and IGTKs.
919 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
920 * unicast frames can also use key indices like GTKs. Hence, if we
921 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 922 *
8dc06a1c
JB		 923 * Note that in a regular BSS, multicast frames are sent by the
924 * AP only, associated stations unicast the frame to the AP first
925 * which then multicasts it on their behalf.
926 *
3017b80b
JB		 927 * There is also a slight problem in IBSS mode: GTKs are negotiated
928 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 929 * The spec seems to expect that one negotiates the same key with
930 * every station but there's no such requirement; VLANs could be
931 * possible.
3017b80b
JB		 932 */
933
3017b80b 934 /*
1990af8d 935 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 936 * addressed to us nor a multicast frame.
937 */
554891e6 938 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 939 return RX_CONTINUE;
3017b80b 940
2569a826
JB		 941 /* start without a key */
942 rx->key = NULL;
943
d4e46a3d 944 if (rx->sta)
e31b8213 945 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 946
761ab470
JB		 947 fc = hdr->frame_control;
948
949 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 950 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
951
e31b8213
JB		 952 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
953 rx->key = sta_ptk;
dc1580dd
JB		 954 if ((status->flag & RX_FLAG_DECRYPTED) &&
955 (status->flag & RX_FLAG_IV_STRIPPED))
956 return RX_CONTINUE;
0c7c10c7 957 /* Skip decryption if the frame is not protected. */
761ab470 958 if (!ieee80211_has_protected(fc))
0c7c10c7 959 return RX_CONTINUE;
3cfcf6ac
JM		 960 } else if (mmie_keyidx >= 0) {
961 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 962 if ((status->flag & RX_FLAG_DECRYPTED) &&
963 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 964 return RX_CONTINUE;
965
966 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
967 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
968 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 969 if (rx->sta)
970 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
971 if (!rx->key)
972 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 973 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 974 /*
975 * The frame was not protected, so skip decryption. However, we
976 * need to set rx->key if there is a key that could have been
977 * used so that the frame may be dropped if encryption would
978 * have been expected.
979 */
980 struct ieee80211_key *key = NULL;
897bed8b
JB		 981 struct ieee80211_sub_if_data *sdata = rx->sdata;
982 int i;
983
761ab470 984 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 985 is_multicast_ether_addr(hdr->addr1) &&
986 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
987 rx->key = key;
897bed8b
JB		 988 else {
989 if (rx->sta) {
990 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
991 key = rcu_dereference(rx->sta->gtk[i]);
992 if (key)
993 break;
994 }
995 }
996 if (!key) {
997 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
998 key = rcu_dereference(sdata->keys[i]);
999 if (key)
1000 break;
1001 }
1002 }
1003 if (key)
1004 rx->key = key;
1005 }
0c7c10c7 1006 return RX_CONTINUE;
571ecf67 1007 } else {
39184b15 1008 u8 keyid;
3017b80b
JB		 1009 /*
1010 * The device doesn't give us the IV so we won't be
1011 * able to look up the key. That's ok though, we
1012 * don't need to decrypt the frame, we just won't
1013 * be able to keep statistics accurate.
1014 * Except for key threshold notifications, should
1015 * we somehow allow the driver to tell us which key
1016 * the hardware used if this flag is set?
1017 */
eb9fb5b8
JB		 1018 if ((status->flag & RX_FLAG_DECRYPTED) &&
1019 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1020 return RX_CONTINUE;
3017b80b 1021
761ab470 1022 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1023
1024 if (rx->skb->len < 8 + hdrlen)
e4c26add 1025 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1026
1027 /*
1028 * no need to call ieee80211_wep_get_keyidx,
1029 * it verifies a bunch of things we've done already
1030 */
39184b15
ZY		 1031 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1032 keyidx = keyid >> 6;
3017b80b 1033
e31b8213
JB		 1034 /* check per-station GTK first, if multicast packet */
1035 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1036 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1037
e31b8213
JB		 1038 /* if not found, try default key */
1039 if (!rx->key) {
1040 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1041
1042 /*
1043 * RSNA-protected unicast frames should always be
1044 * sent with pairwise or station-to-station keys,
1045 * but for WEP we allow using a key index as well.
1046 */
1047 if (rx->key &&
1048 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1049 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1050 !is_multicast_ether_addr(hdr->addr1))
1051 rx->key = NULL;
1052 }
571ecf67
JB		 1053 }
1054
3017b80b 1055 if (rx->key) {
95acac61
JB		 1056 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1057 return RX_DROP_MONITOR;
1058
571ecf67 1059 rx->key->tx_rx_count++;
011bfcc4 1060 /* TODO: add threshold stuff again */
1990af8d 1061 } else {
e4c26add 1062 return RX_DROP_MONITOR;
70f08765
JB		 1063 }
1064
97359d12
JB		 1065 switch (rx->key->conf.cipher) {
1066 case WLAN_CIPHER_SUITE_WEP40:
1067 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1068 result = ieee80211_crypto_wep_decrypt(rx);
1069 break;
97359d12 1070 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1071 result = ieee80211_crypto_tkip_decrypt(rx);
1072 break;
97359d12 1073 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1074 result = ieee80211_crypto_ccmp_decrypt(rx);
1075 break;
97359d12 1076 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1077 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1078 break;
3ffc2a90
JB		 1079 default:
1080 /*
1081 * We can reach here only with HW-only algorithms
1082 * but why didn't it decrypt the frame?!
1083 */
1084 return RX_DROP_UNUSABLE;
70f08765
JB		 1085 }
1086
a8286911
JB		 1087 /* the hdr variable is invalid after the decrypt handlers */
1088
e2f036da 1089 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1090 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1091
1092 return result;
70f08765
JB		 1093}
1094
572e0012
KV		 1095static ieee80211_rx_result debug_noinline
1096ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1097{
1098 struct ieee80211_local *local;
1099 struct ieee80211_hdr *hdr;
1100 struct sk_buff *skb;
1101
1102 local = rx->local;
1103 skb = rx->skb;
1104 hdr = (struct ieee80211_hdr *) skb->data;
1105
1106 if (!local->pspolling)
1107 return RX_CONTINUE;
1108
1109 if (!ieee80211_has_fromds(hdr->frame_control))
1110 /* this is not from AP */
1111 return RX_CONTINUE;
1112
1113 if (!ieee80211_is_data(hdr->frame_control))
1114 return RX_CONTINUE;
1115
1116 if (!ieee80211_has_moredata(hdr->frame_control)) {
1117 /* AP has no more frames buffered for us */
1118 local->pspolling = false;
1119 return RX_CONTINUE;
1120 }
1121
1122 /* more data bit is set, let's request a new frame from the AP */
1123 ieee80211_send_pspoll(local, rx->sdata);
1124
1125 return RX_CONTINUE;
1126}
1127
133b8226 1128static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1129{
133b8226 1130 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1131 struct ieee80211_local *local = sdata->local;
0795af57 1132
3e122be0 1133 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1134 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1135 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1136 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1137#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1138 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1139 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1140#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1141}
1142
ff9458d3 1143static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1144{
571ecf67 1145#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1146 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
608383bf 1147 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1148#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1149
c2c98fde 1150 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1151#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1152 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
608383bf 1153 sta->sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1154#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1155 return;
1156 }
1157
1158 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1159}
1160
d057e5a3
AN		 1161int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1162{
1163 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1164 bool in_ps;
1165
1166 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1167
1168 /* Don't let the same PS state be set twice */
c2c98fde 1169 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1170 if ((start && in_ps) || (!start && !in_ps))
1171 return -EINVAL;
1172
1173 if (start)
1174 ap_sta_ps_start(sta_inf);
1175 else
1176 ap_sta_ps_end(sta_inf);
1177
1178 return 0;
1179}
1180EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1181
47086fc5
JB		 1182static ieee80211_rx_result debug_noinline
1183ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1184{
1185 struct ieee80211_sub_if_data *sdata = rx->sdata;
1186 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1187 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1188 int tid, ac;
1189
1190 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1191 return RX_CONTINUE;
1192
1193 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1194 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1195 return RX_CONTINUE;
1196
1197 /*
1198 * The device handles station powersave, so don't do anything about
1199 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1200 * it to mac80211 since they're handled.)
1201 */
1202 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1203 return RX_CONTINUE;
1204
1205 /*
1206 * Don't do anything if the station isn't already asleep. In
1207 * the uAPSD case, the station will probably be marked asleep,
1208 * in the PS-Poll case the station must be confused ...
1209 */
c2c98fde 1210 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1211 return RX_CONTINUE;
1212
1213 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1214 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1215 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1216 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1217 else
c2c98fde 1218 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1219 }
47086fc5
JB		 1220
1221 /* Free PS Poll skb here instead of returning RX_DROP that would
1222 * count as an dropped frame. */
1223 dev_kfree_skb(rx->skb);
1224
1225 return RX_QUEUED;
1226 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1227 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1228 ieee80211_has_pm(hdr->frame_control) &&
1229 (ieee80211_is_data_qos(hdr->frame_control) ||
1230 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1231 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1232 ac = ieee802_1d_to_ac[tid & 7];
1233
1234 /*
1235 * If this AC is not trigger-enabled do nothing.
1236 *
1237 * NB: This could/should check a separate bitmap of trigger-
1238 * enabled queues, but for now we only implement uAPSD w/o
1239 * TSPEC changes to the ACs, so they're always the same.
1240 */
1241 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1242 return RX_CONTINUE;
1243
1244 /* if we are in a service period, do nothing */
c2c98fde 1245 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1246 return RX_CONTINUE;
1247
c2c98fde 1248 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1249 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1250 else
c2c98fde 1251 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1252 }
1253
1254 return RX_CONTINUE;
1255}
1256
49461622 1257static ieee80211_rx_result debug_noinline
5cf121c3 1258ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1259{
1260 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1261 struct sk_buff *skb = rx->skb;
1262 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1263 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1264
1265 if (!sta)
9ae54c84 1266 return RX_CONTINUE;
571ecf67 1267
b291ba11
JB		 1268 /*
1269 * Update last_rx only for IBSS packets which are for the current
1270 * BSSID to avoid keeping the current IBSS network alive in cases
1271 * where other STAs start using different BSSID.
1272 */
05c914fe 1273 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1274 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1275 NL80211_IFTYPE_ADHOC);
3af6334c 1276 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1277 sta->last_rx = jiffies;
3af6334c
FF		 1278 if (ieee80211_is_data(hdr->frame_control)) {
1279 sta->last_rx_rate_idx = status->rate_idx;
1280 sta->last_rx_rate_flag = status->flag;
1281 }
1282 }
b291ba11
JB		 1283 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1284 /*
33b64eb2
LCC		 1285 * Mesh beacons will update last_rx when if they are found to
1286 * match the current local configuration when processed.
571ecf67 1287 */
b291ba11 1288 sta->last_rx = jiffies;
3af6334c
FF		 1289 if (ieee80211_is_data(hdr->frame_control)) {
1290 sta->last_rx_rate_idx = status->rate_idx;
1291 sta->last_rx_rate_flag = status->flag;
1292 }
571ecf67
JB		 1293 }
1294
554891e6 1295 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1296 return RX_CONTINUE;
571ecf67 1297
3cf335d5
KV		 1298 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1299 ieee80211_sta_rx_notify(rx->sdata, hdr);
1300
571ecf67
JB		 1301 sta->rx_fragments++;
1302 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1303 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1304 sta->last_signal = status->signal;
1305 ewma_add(&sta->avg_signal, -status->signal);
1306 }
571ecf67 1307
72eaa43a
JB		 1308 /*
1309 * Change STA power saving mode only at the end of a frame
1310 * exchange sequence.
1311 */
d057e5a3
AN		 1312 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1313 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1314 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1315 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1316 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1317 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1318 /*
1319 * Ignore doze->wake transitions that are
1320 * indicated by non-data frames, the standard
1321 * is unclear here, but for example going to
1322 * PS mode and then scanning would cause a
1323 * doze->wake transition for the probe request,
1324 * and that is clearly undesirable.
1325 */
1326 if (ieee80211_is_data(hdr->frame_control) &&
1327 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1328 ap_sta_ps_end(sta);
72eaa43a
JB		 1329 } else {
1330 if (ieee80211_has_pm(hdr->frame_control))
1331 ap_sta_ps_start(sta);
1332 }
571ecf67
JB		 1333 }
1334
22403def
JB		 1335 /*
1336 * Drop (qos-)data::nullfunc frames silently, since they
1337 * are used only to control station power saving mode.
1338 */
1339 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1340 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1341 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1342
1343 /*
1344 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1345 * that was not moved to a 4-addr STA vlan yet send
1346 * the event to userspace and for older hostapd drop
1347 * the frame to the monitor interface.
d524215f
FF		 1348 */
1349 if (ieee80211_has_a4(hdr->frame_control) &&
1350 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1351 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1352 !rx->sdata->u.vlan.sta))) {
1353 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1354 cfg80211_rx_unexpected_4addr_frame(
1355 rx->sdata->dev, sta->sta.addr,
1356 GFP_ATOMIC);
d524215f 1357 return RX_DROP_MONITOR;
e7f4a940 1358 }
22403def
JB		 1359 /*
1360 * Update counter and free packet here to avoid
1361 * counting this as a dropped packed.
1362 */
571ecf67
JB		 1363 sta->rx_packets++;
1364 dev_kfree_skb(rx->skb);
9ae54c84 1365 return RX_QUEUED;
571ecf67
JB		 1366 }
1367
9ae54c84 1368 return RX_CONTINUE;
571ecf67
JB		 1369} /* ieee80211_rx_h_sta_process */
1370
571ecf67
JB		 1371static inline struct ieee80211_fragment_entry *
1372ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1373 unsigned int frag, unsigned int seq, int rx_queue,
1374 struct sk_buff **skb)
1375{
1376 struct ieee80211_fragment_entry *entry;
1377 int idx;
1378
1379 idx = sdata->fragment_next;
1380 entry = &sdata->fragments[sdata->fragment_next++];
1381 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1382 sdata->fragment_next = 0;
1383
1384 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1385#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1386 struct ieee80211_hdr *hdr =
1387 (struct ieee80211_hdr *) entry->skb_list.next->data;
1388 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1389 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1390 "addr1=%pM addr2=%pM\n",
47846c9b 1391 sdata->name, idx,
571ecf67 1392 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1393 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1394#endif
571ecf67
JB		 1395 __skb_queue_purge(&entry->skb_list);
1396 }
1397
1398 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1399 *skb = NULL;
1400 entry->first_frag_time = jiffies;
1401 entry->seq = seq;
1402 entry->rx_queue = rx_queue;
1403 entry->last_frag = frag;
1404 entry->ccmp = 0;
1405 entry->extra_len = 0;
1406
1407 return entry;
1408}
1409
1410static inline struct ieee80211_fragment_entry *
1411ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1412 unsigned int frag, unsigned int seq,
571ecf67
JB		 1413 int rx_queue, struct ieee80211_hdr *hdr)
1414{
1415 struct ieee80211_fragment_entry *entry;
1416 int i, idx;
1417
1418 idx = sdata->fragment_next;
1419 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1420 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1421
1422 idx--;
1423 if (idx < 0)
1424 idx = IEEE80211_FRAGMENT_MAX - 1;
1425
1426 entry = &sdata->fragments[idx];
1427 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1428 entry->rx_queue != rx_queue ||
1429 entry->last_frag + 1 != frag)
1430 continue;
1431
b73d70ad 1432 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1433
b73d70ad
HH		 1434 /*
1435 * Check ftype and addresses are equal, else check next fragment
1436 */
1437 if (((hdr->frame_control ^ f_hdr->frame_control) &
1438 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1439 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1440 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1441 continue;
1442
ab46623e 1443 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1444 __skb_queue_purge(&entry->skb_list);
1445 continue;
1446 }
1447 return entry;
1448 }
1449
1450 return NULL;
1451}
1452
49461622 1453static ieee80211_rx_result debug_noinline
5cf121c3 1454ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1455{
1456 struct ieee80211_hdr *hdr;
1457 u16 sc;
358c8d9d 1458 __le16 fc;
571ecf67
JB		 1459 unsigned int frag, seq;
1460 struct ieee80211_fragment_entry *entry;
1461 struct sk_buff *skb;
554891e6 1462 struct ieee80211_rx_status *status;
571ecf67 1463
b73d70ad 1464 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1465 fc = hdr->frame_control;
571ecf67
JB		 1466 sc = le16_to_cpu(hdr->seq_ctrl);
1467 frag = sc & IEEE80211_SCTL_FRAG;
1468
358c8d9d 1469 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1470 (rx->skb)->len < 24 ||
1471 is_multicast_ether_addr(hdr->addr1))) {
1472 /* not fragmented */
1473 goto out;
1474 }
1475 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1476
e3cf8b3f
ZY		 1477 if (skb_linearize(rx->skb))
1478 return RX_DROP_UNUSABLE;
1479
058897a4
AK		 1480 /*
1481 * skb_linearize() might change the skb->data and
1482 * previously cached variables (in this case, hdr) need to
1483 * be refreshed with the new data.
1484 */
1485 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1486 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1487
1488 if (frag == 0) {
1489 /* This is the first fragment of a new frame. */
1490 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1491 rx->seqno_idx, &(rx->skb));
97359d12 1492 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1493 ieee80211_has_protected(fc)) {
9e26297a 1494 int queue = rx->security_idx;
571ecf67
JB		 1495 /* Store CCMP PN so that we can verify that the next
1496 * fragment has a sequential PN value. */
1497 entry->ccmp = 1;
1498 memcpy(entry->last_pn,
9190252c 1499 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1500 CCMP_PN_LEN);
1501 }
9ae54c84 1502 return RX_QUEUED;
571ecf67
JB		 1503 }
1504
1505 /* This is a fragment for a frame that should already be pending in
1506 * fragment cache. Add this fragment to the end of the pending entry.
1507 */
9e26297a
JB		 1508 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1509 rx->seqno_idx, hdr);
571ecf67
JB		 1510 if (!entry) {
1511 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1512 return RX_DROP_MONITOR;
571ecf67
JB		 1513 }
1514
1515 /* Verify that MPDUs within one MSDU have sequential PN values.
1516 * (IEEE 802.11i, 8.3.3.4.5) */
1517 if (entry->ccmp) {
1518 int i;
1519 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1520 int queue;
97359d12 1521 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1522 return RX_DROP_UNUSABLE;
571ecf67
JB		 1523 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1524 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1525 pn[i]++;
1526 if (pn[i])
1527 break;
1528 }
9e26297a 1529 queue = rx->security_idx;
9190252c 1530 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1531 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1532 return RX_DROP_UNUSABLE;
571ecf67
JB		 1533 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1534 }
1535
358c8d9d 1536 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1537 __skb_queue_tail(&entry->skb_list, rx->skb);
1538 entry->last_frag = frag;
1539 entry->extra_len += rx->skb->len;
358c8d9d 1540 if (ieee80211_has_morefrags(fc)) {
571ecf67 1541 rx->skb = NULL;
9ae54c84 1542 return RX_QUEUED;
571ecf67
JB		 1543 }
1544
1545 rx->skb = __skb_dequeue(&entry->skb_list);
1546 if (skb_tailroom(rx->skb) < entry->extra_len) {
1547 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1548 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1549 GFP_ATOMIC))) {
1550 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1551 __skb_queue_purge(&entry->skb_list);
e4c26add 1552 return RX_DROP_UNUSABLE;
571ecf67
JB		 1553 }
1554 }
1555 while ((skb = __skb_dequeue(&entry->skb_list))) {
1556 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1557 dev_kfree_skb(skb);
1558 }
1559
1560 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1561 status = IEEE80211_SKB_RXCB(rx->skb);
1562 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1563
1564 out:
1565 if (rx->sta)
1566 rx->sta->rx_packets++;
1567 if (is_multicast_ether_addr(hdr->addr1))
1568 rx->local->dot11MulticastReceivedFrameCount++;
1569 else
1570 ieee80211_led_rx(rx->local);
9ae54c84 1571 return RX_CONTINUE;
571ecf67
JB		 1572}
1573
76ee65bf 1574static int
5cf121c3 1575ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1576{
07346f81 1577 if (unlikely(!rx->sta ||
c2c98fde 1578 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1579 return -EACCES;
571ecf67 1580
76ee65bf 1581 return 0;
571ecf67
JB		 1582}
1583
76ee65bf 1584static int
358c8d9d 1585ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1586{
eb9fb5b8
JB		 1587 struct sk_buff *skb = rx->skb;
1588 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1589
3017b80b 1590 /*
7848ba7d
JB		 1591 * Pass through unencrypted frames if the hardware has
1592 * decrypted them already.
3017b80b 1593 */
eb9fb5b8 1594 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1595 return 0;
571ecf67
JB		 1596
1597 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1598 if (unlikely(!ieee80211_has_protected(fc) &&
1599 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1600 ieee80211_is_data(fc) &&
b3fc9c6c 1601 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1602 return -EACCES;
bef5d1c7
JB		 1603
1604 return 0;
1605}
1606
1607static int
1608ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1609{
1610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1611 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1612 __le16 fc = hdr->frame_control;
bef5d1c7 1613
e3efca0a
JM		 1614 /*
1615 * Pass through unencrypted frames if the hardware has
1616 * decrypted them already.
1617 */
1618 if (status->flag & RX_FLAG_DECRYPTED)
1619 return 0;
bef5d1c7 1620
c2c98fde 1621 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1622 if (unlikely(!ieee80211_has_protected(fc) &&
1623 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1624 rx->key)) {
1625 if (ieee80211_is_deauth(fc))
1626 cfg80211_send_unprot_deauth(rx->sdata->dev,
1627 rx->skb->data,
1628 rx->skb->len);
1629 else if (ieee80211_is_disassoc(fc))
1630 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1631 rx->skb->data,
1632 rx->skb->len);
f2ca3ea4 1633 return -EACCES;
cf4e594e 1634 }
f2ca3ea4 1635 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1636 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1637 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1638 if (ieee80211_is_deauth(fc))
1639 cfg80211_send_unprot_deauth(rx->sdata->dev,
1640 rx->skb->data,
1641 rx->skb->len);
1642 else if (ieee80211_is_disassoc(fc))
1643 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1644 rx->skb->data,
1645 rx->skb->len);
f2ca3ea4 1646 return -EACCES;
cf4e594e 1647 }
f2ca3ea4
JM		 1648 /*
1649 * When using MFP, Action frames are not allowed prior to
1650 * having configured keys.
1651 */
1652 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1653 ieee80211_is_robust_mgmt_frame(
1654 (struct ieee80211_hdr *) rx->skb->data)))
1655 return -EACCES;
1656 }
b3fc9c6c 1657
76ee65bf 1658 return 0;
571ecf67
JB		 1659}
1660
76ee65bf 1661static int
4114fa21 1662__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1663{
eb9fb5b8 1664 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1665 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1666 bool check_port_control = false;
1667 struct ethhdr *ehdr;
1668 int ret;
f14543ee 1669
4114fa21 1670 *port_control = false;
9bc383de
JB		 1671 if (ieee80211_has_a4(hdr->frame_control) &&
1672 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1673 return -1;
9bc383de 1674
fbb327c5
FF		 1675 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1676 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1677
1678 if (!sdata->u.mgd.use_4addr)
1679 return -1;
1680 else
1681 check_port_control = true;
1682 }
1683
9bc383de 1684 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1685 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1686 return -1;
571ecf67 1687
fbb327c5 1688 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1689 if (ret < 0)
fbb327c5
FF		 1690 return ret;
1691
1692 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1693 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1694 *port_control = true;
1695 else if (check_port_control)
fbb327c5
FF		 1696 return -1;
1697
1698 return 0;
76ee65bf 1699}
571ecf67 1700
ce3edf6d
JB		 1701/*
1702 * requires that rx->skb is a frame with ethernet header
1703 */
358c8d9d 1704static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1705{
c97c23e3 1706 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1707 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1708 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1709
1710 /*
1711 * Allow EAPOL frames to us/the PAE group address regardless
1712 * of whether the frame was encrypted or not.
1713 */
a621fa4d 1714 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1715 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1716 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1717 return true;
1718
1719 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1720 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1721 return false;
1722
1723 return true;
1724}
1725
1726/*
1727 * requires that rx->skb is a frame with ethernet header
1728 */
76ee65bf 1729static void
5cf121c3 1730ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1731{
eb9fb5b8
JB		 1732 struct ieee80211_sub_if_data *sdata = rx->sdata;
1733 struct net_device *dev = sdata->dev;
76ee65bf 1734 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1735 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1736 struct sta_info *dsta;
554891e6 1737 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1738
76ee65bf
RR		 1739 skb = rx->skb;
1740 xmit_skb = NULL;
571ecf67 1741
05c914fe
JB		 1742 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1743 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1744 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1745 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1746 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1747 if (is_multicast_ether_addr(ehdr->h_dest)) {
1748 /*
1749 * send multicast frames both to higher layers in
1750 * local net stack and back to the wireless medium
1751 */
76ee65bf
RR		 1752 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1753 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1754 printk(KERN_DEBUG "%s: failed to clone "
1755 "multicast frame\n", dev->name);
1756 } else {
abe60632
JB		 1757 dsta = sta_info_get(sdata, skb->data);
1758 if (dsta) {
ce3edf6d
JB		 1759 /*
1760 * The destination station is associated to
1761 * this AP (in this VLAN), so send the frame
1762 * directly to it and do not pass it to local
1763 * net stack.
571ecf67 1764 */
76ee65bf 1765 xmit_skb = skb;
571ecf67
JB		 1766 skb = NULL;
1767 }
571ecf67
JB		 1768 }
1769 }
1770
1771 if (skb) {
d1c3a37c
JB		 1772 int align __maybe_unused;
1773
59d9cb07 1774#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1775 /*
1776 * 'align' will only take the values 0 or 2 here
1777 * since all frames are required to be aligned
1778 * to 2-byte boundaries when being passed to
1779 * mac80211. That also explains the __skb_push()
1780 * below.
1781 */
dacb6f1d 1782 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1783 if (align) {
1784 if (WARN_ON(skb_headroom(skb) < 3)) {
1785 dev_kfree_skb(skb);
1786 skb = NULL;
1787 } else {
1788 u8 *data = skb->data;
8ce0b589
ZY		 1789 size_t len = skb_headlen(skb);
1790 skb->data -= align;
1791 memmove(skb->data, data, len);
1792 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1793 }
1794 }
1795#endif
1796
1797 if (skb) {
1798 /* deliver to local stack */
1799 skb->protocol = eth_type_trans(skb, dev);
1800 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1801 netif_receive_skb(skb);
d1c3a37c 1802 }
571ecf67
JB		 1803 }
1804
76ee65bf 1805 if (xmit_skb) {
aef6c928
HS		 1806 /*
1807 * Send to wireless media and increase priority by 256 to
1808 * keep the received priority instead of reclassifying
1809 * the frame (see cfg80211_classify8021d).
1810 */
1811 xmit_skb->priority += 256;
f831e909 1812 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1813 skb_reset_network_header(xmit_skb);
1814 skb_reset_mac_header(xmit_skb);
76ee65bf 1815 dev_queue_xmit(xmit_skb);
571ecf67 1816 }
76ee65bf
RR		 1817}
1818
49461622 1819static ieee80211_rx_result debug_noinline
5cf121c3 1820ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1821{
eb9fb5b8 1822 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1823 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1825 __le16 fc = hdr->frame_control;
eaf85ca7 1826 struct sk_buff_head frame_list;
554891e6 1827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1828
358c8d9d 1829 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1830 return RX_CONTINUE;
fd4c7f2f 1831
358c8d9d 1832 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1833 return RX_DROP_MONITOR;
fd4c7f2f 1834
554891e6 1835 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1836 return RX_CONTINUE;
fd4c7f2f 1837
eaf85ca7
ZY		 1838 if (ieee80211_has_a4(hdr->frame_control) &&
1839 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1840 !rx->sdata->u.vlan.sta)
e4c26add 1841 return RX_DROP_UNUSABLE;
fd4c7f2f 1842
eaf85ca7
ZY		 1843 if (is_multicast_ether_addr(hdr->addr1) &&
1844 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1845 rx->sdata->u.vlan.sta) ||
1846 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1847 rx->sdata->u.mgd.use_4addr)))
e4c26add 1848 return RX_DROP_UNUSABLE;
fd4c7f2f 1849
eaf85ca7
ZY		 1850 skb->dev = dev;
1851 __skb_queue_head_init(&frame_list);
fd4c7f2f 1852
e3cf8b3f
ZY		 1853 if (skb_linearize(skb))
1854 return RX_DROP_UNUSABLE;
1855
eaf85ca7
ZY		 1856 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1857 rx->sdata->vif.type,
8b3becad 1858 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1859
eaf85ca7
ZY		 1860 while (!skb_queue_empty(&frame_list)) {
1861 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1862
358c8d9d 1863 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1864 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1865 continue;
1866 }
eaf85ca7
ZY		 1867 dev->stats.rx_packets++;
1868 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1869
1870 ieee80211_deliver_skb(rx);
1871 }
1872
9ae54c84 1873 return RX_QUEUED;
fd4c7f2f
RR		 1874}
1875
bf94e17b 1876#ifdef CONFIG_MAC80211_MESH
b0dee578 1877static ieee80211_rx_result
e32f85f7
LCC		 1878ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1879{
30789eb6
TP		 1880 struct ieee80211_hdr *fwd_hdr, *hdr;
1881 struct ieee80211_tx_info *info;
e32f85f7 1882 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1883 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1884 struct ieee80211_local *local = rx->local;
eb9fb5b8 1885 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1886 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1887 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1888 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1889 u16 q, hdrlen;
e32f85f7
LCC		 1890
1891 hdr = (struct ieee80211_hdr *) skb->data;
1892 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1893 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1894
2157fdd6
TP		 1895 /* frame is in RMC, don't forward */
1896 if (ieee80211_is_data(hdr->frame_control) &&
1897 is_multicast_ether_addr(hdr->addr1) &&
1898 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1899 return RX_DROP_MONITOR;
1900
e32f85f7
LCC		 1901 if (!ieee80211_is_data(hdr->frame_control))
1902 return RX_CONTINUE;
1903
1904 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1905 return RX_DROP_MONITOR;
1906
43b7b314 1907 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1908 struct mesh_path *mppath;
43b7b314
JC		 1909 char *proxied_addr;
1910 char *mpp_addr;
1911
1912 if (is_multicast_ether_addr(hdr->addr1)) {
1913 mpp_addr = hdr->addr3;
1914 proxied_addr = mesh_hdr->eaddr1;
1915 } else {
1916 mpp_addr = hdr->addr4;
1917 proxied_addr = mesh_hdr->eaddr2;
1918 }
79617dee 1919
79617dee 1920 rcu_read_lock();
43b7b314 1921 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1922 if (!mppath) {
43b7b314 1923 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1924 } else {
1925 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1926 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1927 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1928 spin_unlock_bh(&mppath->state_lock);
1929 }
1930 rcu_read_unlock();
1931 }
1932
3c5772a5
JC		 1933 /* Frame has reached destination. Don't forward */
1934 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1935 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1936 return RX_CONTINUE;
1937
d3c1597b
TP		 1938 q = ieee80211_select_queue_80211(local, skb, hdr);
1939 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1940 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1941 return RX_DROP_MONITOR;
1942 }
1943 skb_set_queue_mapping(skb, q);
e32f85f7 1944
30789eb6
TP		 1945 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1946 goto out;
c8a61a7d 1947
30789eb6
TP		 1948 if (!--mesh_hdr->ttl) {
1949 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1950 return RX_DROP_MONITOR;
1951 }
1952
d665508b
CYY		 1953 if (!ifmsh->mshcfg.dot11MeshForwarding)
1954 goto out;
1955
30789eb6
TP		 1956 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1957 if (!fwd_skb) {
1958 if (net_ratelimit())
1959 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1960 sdata->name);
1961 goto out;
1962 }
1963
1964 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1965 info = IEEE80211_SKB_CB(fwd_skb);
1966 memset(info, 0, sizeof(*info));
1967 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1968 info->control.vif = &rx->sdata->vif;
1969 info->control.jiffies = jiffies;
1970 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1971 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1972 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1973 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1974 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1975 } else {
1976 /* unable to resolve next hop */
1977 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1978 0, reason, fwd_hdr->addr2, sdata);
1979 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1980 kfree_skb(fwd_skb);
30789eb6 1981 return RX_DROP_MONITOR;
e32f85f7
LCC		 1982 }
1983
30789eb6
TP		 1984 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1985 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1986 out:
3c5772a5 1987 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1988 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1989 return RX_CONTINUE;
1990 else
1991 return RX_DROP_MONITOR;
1992}
bf94e17b 1993#endif
e32f85f7 1994
49461622 1995static ieee80211_rx_result debug_noinline
5cf121c3 1996ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1997{
eb9fb5b8 1998 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1999 struct ieee80211_local *local = rx->local;
eb9fb5b8 2000 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2001 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2002 __le16 fc = hdr->frame_control;
4114fa21 2003 bool port_control;
ce3edf6d 2004 int err;
76ee65bf 2005
358c8d9d 2006 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2007 return RX_CONTINUE;
76ee65bf 2008
358c8d9d 2009 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2010 return RX_DROP_MONITOR;
76ee65bf 2011
f14543ee 2012 /*
e7f4a940
JB		 2013 * Send unexpected-4addr-frame event to hostapd. For older versions,
2014 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2015 */
2016 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2017 sdata->vif.type == NL80211_IFTYPE_AP) {
2018 if (rx->sta &&
2019 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2020 cfg80211_rx_unexpected_4addr_frame(
2021 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2022 return RX_DROP_MONITOR;
e7f4a940 2023 }
f14543ee 2024
4114fa21 2025 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2026 if (unlikely(err))
e4c26add 2027 return RX_DROP_UNUSABLE;
76ee65bf 2028
358c8d9d 2029 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2030 return RX_DROP_MONITOR;
ce3edf6d 2031
4114fa21
FF		 2032 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2033 unlikely(port_control) && sdata->bss) {
2034 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2035 u.ap);
2036 dev = sdata->dev;
2037 rx->sdata = sdata;
2038 }
2039
76ee65bf
RR		 2040 rx->skb->dev = dev;
2041
2042 dev->stats.rx_packets++;
2043 dev->stats.rx_bytes += rx->skb->len;
2044
08ca944e 2045 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2046 !is_multicast_ether_addr(
2047 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2048 (!local->scanning &&
2049 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2050 mod_timer(&local->dynamic_ps_timer, jiffies +
2051 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2052 }
2053
76ee65bf 2054 ieee80211_deliver_skb(rx);
571ecf67 2055
9ae54c84 2056 return RX_QUEUED;
571ecf67
JB		 2057}
2058
49461622 2059static ieee80211_rx_result debug_noinline
24a8fdad 2060ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2061{
2062 struct ieee80211_local *local = rx->local;
2063 struct ieee80211_hw *hw = &local->hw;
2064 struct sk_buff *skb = rx->skb;
a7767f95 2065 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2066 struct tid_ampdu_rx *tid_agg_rx;
2067 u16 start_seq_num;
2068 u16 tid;
2069
a7767f95 2070 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2071 return RX_CONTINUE;
71364716 2072
a7767f95 2073 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2074 struct {
2075 __le16 control, start_seq_num;
2076 } __packed bar_data;
2077
71364716 2078 if (!rx->sta)
a02ae758 2079 return RX_DROP_MONITOR;
8ae5977f
JB		 2080
2081 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2082 &bar_data, sizeof(bar_data)))
2083 return RX_DROP_MONITOR;
2084
8ae5977f 2085 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2086
2087 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2088 if (!tid_agg_rx)
a02ae758 2089 return RX_DROP_MONITOR;
71364716 2090
8ae5977f 2091 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2092
2093 /* reset session timer */
20ad19d0
JB		 2094 if (tid_agg_rx->timeout)
2095 mod_timer(&tid_agg_rx->session_timer,
2096 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2097
dd318575 2098 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2099 /* release stored frames up to start of BAR */
24a8fdad 2100 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2101 spin_unlock(&tid_agg_rx->reorder_lock);
2102
a02ae758
JB		 2103 kfree_skb(skb);
2104 return RX_QUEUED;
71364716
RR		 2105 }
2106
08daecae
JB		 2107 /*
2108 * After this point, we only want management frames,
2109 * so we can drop all remaining control frames to
2110 * cooked monitor interfaces.
2111 */
2112 return RX_DROP_MONITOR;
71364716
RR		 2113}
2114
f4f727a6
JM		 2115static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2116 struct ieee80211_mgmt *mgmt,
2117 size_t len)
fea14732
JM		 2118{
2119 struct ieee80211_local *local = sdata->local;
2120 struct sk_buff *skb;
2121 struct ieee80211_mgmt *resp;
2122
47846c9b 2123 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2124 /* Not to own unicast address */
2125 return;
2126 }
2127
46900298
JB		 2128 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2129 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2130 /* Not from the current AP or not associated yet. */
fea14732
JM		 2131 return;
2132 }
2133
2134 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2135 /* Too short SA Query request frame */
2136 return;
2137 }
2138
2139 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2140 if (skb == NULL)
2141 return;
2142
2143 skb_reserve(skb, local->hw.extra_tx_headroom);
2144 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2145 memset(resp, 0, 24);
2146 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2147 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2148 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2149 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2150 IEEE80211_STYPE_ACTION);
2151 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2152 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2153 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2154 memcpy(resp->u.action.u.sa_query.trans_id,
2155 mgmt->u.action.u.sa_query.trans_id,
2156 WLAN_SA_QUERY_TR_ID_LEN);
2157
62ae67be 2158 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2159}
2160
2e161f78
JB		 2161static ieee80211_rx_result debug_noinline
2162ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2163{
2164 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2165 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2166
2167 /*
2168 * From here on, look only at management frames.
2169 * Data and control frames are already handled,
2170 * and unknown (reserved) frames are useless.
2171 */
2172 if (rx->skb->len < 24)
2173 return RX_DROP_MONITOR;
2174
2175 if (!ieee80211_is_mgmt(mgmt->frame_control))
2176 return RX_DROP_MONITOR;
2177
ee971924
JB		 2178 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2179 ieee80211_is_beacon(mgmt->frame_control) &&
2180 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2181 int sig = 0;
2182
2183 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2184 sig = status->signal;
2185
ee971924
JB		 2186 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2187 rx->skb->data, rx->skb->len,
804483e9 2188 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2189 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2190 }
2191
554891e6 2192 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2193 return RX_DROP_MONITOR;
2194
2195 if (ieee80211_drop_unencrypted_mgmt(rx))
2196 return RX_DROP_UNUSABLE;
2197
2198 return RX_CONTINUE;
2199}
2200
de1ede7a
JB		 2201static ieee80211_rx_result debug_noinline
2202ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2203{
2204 struct ieee80211_local *local = rx->local;
eb9fb5b8 2205 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2206 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2208 int len = rx->skb->len;
2209
2210 if (!ieee80211_is_action(mgmt->frame_control))
2211 return RX_CONTINUE;
2212
026331c4
JM		 2213 /* drop too small frames */
2214 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2215 return RX_DROP_UNUSABLE;
de1ede7a 2216
026331c4 2217 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2218 return RX_DROP_UNUSABLE;
de1ede7a 2219
554891e6 2220 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2221 return RX_DROP_UNUSABLE;
97ebe12a 2222
de1ede7a 2223 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2224 case WLAN_CATEGORY_HT:
2225 /* reject HT action frames from stations not supporting HT */
2226 if (!rx->sta->sta.ht_cap.ht_supported)
2227 goto invalid;
2228
2229 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2230 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2231 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2232 sdata->vif.type != NL80211_IFTYPE_AP &&
2233 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2234 break;
2235
2236 /* verify action & smps_control are present */
2237 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2238 goto invalid;
2239
2240 switch (mgmt->u.action.u.ht_smps.action) {
2241 case WLAN_HT_ACTION_SMPS: {
2242 struct ieee80211_supported_band *sband;
2243 u8 smps;
2244
2245 /* convert to HT capability */
2246 switch (mgmt->u.action.u.ht_smps.smps_control) {
2247 case WLAN_HT_SMPS_CONTROL_DISABLED:
2248 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2249 break;
2250 case WLAN_HT_SMPS_CONTROL_STATIC:
2251 smps = WLAN_HT_CAP_SM_PS_STATIC;
2252 break;
2253 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2254 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2255 break;
2256 default:
2257 goto invalid;
2258 }
2259 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2260
2261 /* if no change do nothing */
2262 if ((rx->sta->sta.ht_cap.cap &
2263 IEEE80211_HT_CAP_SM_PS) == smps)
2264 goto handled;
2265
2266 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2267 rx->sta->sta.ht_cap.cap |= smps;
2268
2269 sband = rx->local->hw.wiphy->bands[status->band];
2270
3117bbdb
PS		 2271 rate_control_rate_update(
2272 local, sband, rx->sta,
2273 IEEE80211_RC_SMPS_CHANGED,
2274 ieee80211_get_tx_channel_type(
2275 local, local->_oper_channel_type));
1d8d3dec
JB		 2276 goto handled;
2277 }
2278 default:
2279 goto invalid;
2280 }
2281
2282 break;
de1ede7a 2283 case WLAN_CATEGORY_BACK:
8abd3f9b 2284 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2285 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2286 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2287 sdata->vif.type != NL80211_IFTYPE_AP &&
2288 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2289 break;
8abd3f9b 2290
026331c4
JM		 2291 /* verify action_code is present */
2292 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2293 break;
2294
de1ede7a
JB		 2295 switch (mgmt->u.action.u.addba_req.action_code) {
2296 case WLAN_ACTION_ADDBA_REQ:
2297 if (len < (IEEE80211_MIN_ACTION_SIZE +
2298 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2299 goto invalid;
2300 break;
de1ede7a
JB		 2301 case WLAN_ACTION_ADDBA_RESP:
2302 if (len < (IEEE80211_MIN_ACTION_SIZE +
2303 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2304 goto invalid;
2305 break;
de1ede7a
JB		 2306 case WLAN_ACTION_DELBA:
2307 if (len < (IEEE80211_MIN_ACTION_SIZE +
2308 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2309 goto invalid;
2310 break;
2311 default:
2312 goto invalid;
de1ede7a 2313 }
bed7ee6e 2314
8b58ff83 2315 goto queue;
39192c0b
JB		 2316 case WLAN_CATEGORY_SPECTRUM_MGMT:
2317 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2318 break;
46900298
JB		 2319
2320 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2321 break;
46900298 2322
026331c4
JM		 2323 /* verify action_code is present */
2324 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2325 break;
2326
39192c0b
JB		 2327 switch (mgmt->u.action.u.measurement.action_code) {
2328 case WLAN_ACTION_SPCT_MSR_REQ:
2329 if (len < (IEEE80211_MIN_ACTION_SIZE +
2330 sizeof(mgmt->u.action.u.measurement)))
84040805 2331 break;
39192c0b 2332 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2333 goto handled;
c481ec97
S		 2334 case WLAN_ACTION_SPCT_CHL_SWITCH:
2335 if (len < (IEEE80211_MIN_ACTION_SIZE +
2336 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2337 break;
c481ec97 2338
cc32abd4 2339 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2340 break;
cc32abd4 2341
888d04df 2342 if (compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2343 break;
c481ec97 2344
8b58ff83 2345 goto queue;
39192c0b
JB		 2346 }
2347 break;
fea14732
JM		 2348 case WLAN_CATEGORY_SA_QUERY:
2349 if (len < (IEEE80211_MIN_ACTION_SIZE +
2350 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2351 break;
2352
fea14732
JM		 2353 switch (mgmt->u.action.u.sa_query.action) {
2354 case WLAN_ACTION_SA_QUERY_REQUEST:
2355 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2356 break;
fea14732 2357 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2358 goto handled;
fea14732
JM		 2359 }
2360 break;
8db09850
TP		 2361 case WLAN_CATEGORY_SELF_PROTECTED:
2362 switch (mgmt->u.action.u.self_prot.action_code) {
2363 case WLAN_SP_MESH_PEERING_OPEN:
2364 case WLAN_SP_MESH_PEERING_CLOSE:
2365 case WLAN_SP_MESH_PEERING_CONFIRM:
2366 if (!ieee80211_vif_is_mesh(&sdata->vif))
2367 goto invalid;
2368 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2369 /* userspace handles this frame */
2370 break;
2371 goto queue;
2372 case WLAN_SP_MGK_INFORM:
2373 case WLAN_SP_MGK_ACK:
2374 if (!ieee80211_vif_is_mesh(&sdata->vif))
2375 goto invalid;
2376 break;
2377 }
2378 break;
d3aaec8a 2379 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2380 if (!ieee80211_vif_is_mesh(&sdata->vif))
2381 break;
25d49e4d
TP		 2382 if (mesh_action_is_path_sel(mgmt) &&
2383 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2384 break;
2385 goto queue;
84040805 2386 }
026331c4 2387
2e161f78
JB		 2388 return RX_CONTINUE;
2389
bed7ee6e 2390 invalid:
554891e6 2391 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2392 /* will return in the next handlers */
2393 return RX_CONTINUE;
2394
2395 handled:
2396 if (rx->sta)
2397 rx->sta->rx_packets++;
2398 dev_kfree_skb(rx->skb);
2399 return RX_QUEUED;
2400
2401 queue:
2402 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2403 skb_queue_tail(&sdata->skb_queue, rx->skb);
2404 ieee80211_queue_work(&local->hw, &sdata->work);
2405 if (rx->sta)
2406 rx->sta->rx_packets++;
2407 return RX_QUEUED;
2408}
2409
2410static ieee80211_rx_result debug_noinline
2411ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2412{
554891e6 2413 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2414 int sig = 0;
2e161f78
JB		 2415
2416 /* skip known-bad action frames and return them in the next handler */
554891e6 2417 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2418 return RX_CONTINUE;
d7907448 2419
026331c4
JM		 2420 /*
2421 * Getting here means the kernel doesn't know how to handle
2422 * it, but maybe userspace does ... include returned frames
2423 * so userspace can register for those to know whether ones
2424 * it transmitted were processed or returned.
2425 */
026331c4 2426
804483e9
JB		 2427 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2428 sig = status->signal;
2429
2430 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
2e161f78
JB		 2431 rx->skb->data, rx->skb->len,
2432 GFP_ATOMIC)) {
2433 if (rx->sta)
2434 rx->sta->rx_packets++;
2435 dev_kfree_skb(rx->skb);
2436 return RX_QUEUED;
2437 }
2438
2439
2440 return RX_CONTINUE;
2441}
2442
2443static ieee80211_rx_result debug_noinline
2444ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2445{
2446 struct ieee80211_local *local = rx->local;
2447 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2448 struct sk_buff *nskb;
2449 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2450 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2451
2452 if (!ieee80211_is_action(mgmt->frame_control))
2453 return RX_CONTINUE;
2454
2455 /*
2456 * For AP mode, hostapd is responsible for handling any action
2457 * frames that we didn't handle, including returning unknown
2458 * ones. For all other modes we will return them to the sender,
2459 * setting the 0x80 bit in the action category, as required by
2460 * 802.11-2007 7.3.1.11.
2461 * Newer versions of hostapd shall also use the management frame
2462 * registration mechanisms, but older ones still use cooked
2463 * monitor interfaces so push all frames there.
2464 */
554891e6 2465 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2466 (sdata->vif.type == NL80211_IFTYPE_AP ||
2467 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2468 return RX_DROP_MONITOR;
026331c4 2469
84040805
JB		 2470 /* do not return rejected action frames */
2471 if (mgmt->u.action.category & 0x80)
2472 return RX_DROP_UNUSABLE;
2473
2474 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2475 GFP_ATOMIC);
2476 if (nskb) {
292b4df6 2477 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2478
292b4df6
JL		 2479 nmgmt->u.action.category |= 0x80;
2480 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2481 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2482
2483 memset(nskb->cb, 0, sizeof(nskb->cb));
2484
2485 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2486 }
39192c0b
JB		 2487 dev_kfree_skb(rx->skb);
2488 return RX_QUEUED;
de1ede7a
JB		 2489}
2490
49461622 2491static ieee80211_rx_result debug_noinline
5cf121c3 2492ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2493{
eb9fb5b8 2494 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2495 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2496 __le16 stype;
571ecf67 2497
77a121c3 2498 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2499
77a121c3
JB		 2500 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2501 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2502 sdata->vif.type != NL80211_IFTYPE_STATION)
2503 return RX_DROP_MONITOR;
472dbc45 2504
77a121c3 2505 switch (stype) {
66e67e41 2506 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2507 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2508 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2509 /* process for all: mesh, mlme, ibss */
2510 break;
66e67e41
JB		 2511 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2512 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2513 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2514 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2515 if (is_multicast_ether_addr(mgmt->da) &&
2516 !is_broadcast_ether_addr(mgmt->da))
2517 return RX_DROP_MONITOR;
2518
77a121c3
JB		 2519 /* process only for station */
2520 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2521 return RX_DROP_MONITOR;
2522 break;
2523 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2524 /* process only for ibss */
2525 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2526 return RX_DROP_MONITOR;
2527 break;
2528 default:
2529 return RX_DROP_MONITOR;
2530 }
f9d540ee 2531
77a121c3 2532 /* queue up frame and kick off work to process it */
c1475ca9 2533 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2534 skb_queue_tail(&sdata->skb_queue, rx->skb);
2535 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2536 if (rx->sta)
2537 rx->sta->rx_packets++;
46900298 2538
77a121c3 2539 return RX_QUEUED;
571ecf67
JB		 2540}
2541
5cf121c3 2542/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2543static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2544 struct ieee80211_rate *rate)
3d30d949
MW		 2545{
2546 struct ieee80211_sub_if_data *sdata;
2547 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2548 struct sk_buff *skb = rx->skb, *skb2;
2549 struct net_device *prev_dev = NULL;
eb9fb5b8 2550 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2551 int needed_headroom;
3d30d949 2552
554891e6
JB		 2553 /*
2554 * If cooked monitor has been processed already, then
2555 * don't do it again. If not, set the flag.
2556 */
2557 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2558 goto out_free_skb;
554891e6 2559 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2560
152c477a
JB		 2561 /* If there are no cooked monitor interfaces, just free the SKB */
2562 if (!local->cooked_mntrs)
2563 goto out_free_skb;
2564
293702a3
JB		 2565 /* room for the radiotap header based on driver features */
2566 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2567
293702a3
JB		 2568 if (skb_headroom(skb) < needed_headroom &&
2569 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2570 goto out_free_skb;
3d30d949 2571
293702a3
JB		 2572 /* prepend radiotap information */
2573 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
3d30d949
MW		 2574
2575 skb_set_mac_header(skb, 0);
2576 skb->ip_summed = CHECKSUM_UNNECESSARY;
2577 skb->pkt_type = PACKET_OTHERHOST;
2578 skb->protocol = htons(ETH_P_802_2);
2579
2580 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2581 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2582 continue;
2583
05c914fe 2584 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2585 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2586 continue;
2587
2588 if (prev_dev) {
2589 skb2 = skb_clone(skb, GFP_ATOMIC);
2590 if (skb2) {
2591 skb2->dev = prev_dev;
5548a8a1 2592 netif_receive_skb(skb2);
3d30d949
MW		 2593 }
2594 }
2595
2596 prev_dev = sdata->dev;
2597 sdata->dev->stats.rx_packets++;
2598 sdata->dev->stats.rx_bytes += skb->len;
2599 }
2600
2601 if (prev_dev) {
2602 skb->dev = prev_dev;
5548a8a1 2603 netif_receive_skb(skb);
554891e6
JB		 2604 return;
2605 }
3d30d949
MW		 2606
2607 out_free_skb:
2608 dev_kfree_skb(skb);
2609}
2610
aa0c8636
CL		 2611static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2612 ieee80211_rx_result res)
2613{
2614 switch (res) {
2615 case RX_DROP_MONITOR:
2616 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2617 if (rx->sta)
2618 rx->sta->rx_dropped++;
2619 /* fall through */
2620 case RX_CONTINUE: {
2621 struct ieee80211_rate *rate = NULL;
2622 struct ieee80211_supported_band *sband;
2623 struct ieee80211_rx_status *status;
2624
2625 status = IEEE80211_SKB_RXCB((rx->skb));
2626
2627 sband = rx->local->hw.wiphy->bands[status->band];
2628 if (!(status->flag & RX_FLAG_HT))
2629 rate = &sband->bitrates[status->rate_idx];
2630
2631 ieee80211_rx_cooked_monitor(rx, rate);
2632 break;
2633 }
2634 case RX_DROP_UNUSABLE:
2635 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2636 if (rx->sta)
2637 rx->sta->rx_dropped++;
2638 dev_kfree_skb(rx->skb);
2639 break;
2640 case RX_QUEUED:
2641 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2642 break;
2643 }
2644}
571ecf67 2645
24a8fdad 2646static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2647{
58905290 2648 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2649 struct sk_buff *skb;
8944b79f 2650
e32f85f7
LCC		 2651#define CALL_RXH(rxh) \
2652 do { \
2653 res = rxh(rx); \
2654 if (res != RX_CONTINUE) \
2569a826 2655 goto rxh_next; \
e32f85f7 2656 } while (0);
49461622 2657
24a8fdad
CL		 2658 spin_lock(&rx->local->rx_skb_queue.lock);
2659 if (rx->local->running_rx_handler)
2660 goto unlock;
2661
2662 rx->local->running_rx_handler = true;
2663
2664 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2665 spin_unlock(&rx->local->rx_skb_queue.lock);
2666
2569a826
JB		 2667 /*
2668 * all the other fields are valid across frames
2669 * that belong to an aMPDU since they are on the
2670 * same TID from the same station
2671 */
2672 rx->skb = skb;
2673
2674 CALL_RXH(ieee80211_rx_h_decrypt)
2675 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2676 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2677 CALL_RXH(ieee80211_rx_h_sta_process)
2678 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2679 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2680 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2681#ifdef CONFIG_MAC80211_MESH
aa0c8636 2682 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2683 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2684#endif
2154c81c 2685 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2686 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2687 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2688 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2689 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2690 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2691 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2692 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2693
aa0c8636
CL		 2694 rxh_next:
2695 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2696 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2697#undef CALL_RXH
aa0c8636 2698 }
24a8fdad
CL		 2699
2700 rx->local->running_rx_handler = false;
2701
2702 unlock:
2703 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2704}
2705
4406c376 2706static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2707{
aa0c8636
CL		 2708 ieee80211_rx_result res = RX_DROP_MONITOR;
2709
aa0c8636
CL		 2710#define CALL_RXH(rxh) \
2711 do { \
2712 res = rxh(rx); \
2713 if (res != RX_CONTINUE) \
2714 goto rxh_next; \
2715 } while (0);
2716
2717 CALL_RXH(ieee80211_rx_h_passive_scan)
2718 CALL_RXH(ieee80211_rx_h_check)
2719
24a8fdad 2720 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2721
24a8fdad 2722 ieee80211_rx_handlers(rx);
aa0c8636 2723 return;
49461622 2724
2569a826 2725 rxh_next:
aa0c8636
CL		 2726 ieee80211_rx_handlers_result(rx, res);
2727
2728#undef CALL_RXH
58905290
JB		 2729}
2730
2bff8ebf 2731/*
dd318575
JB		 2732 * This function makes calls into the RX path, therefore
2733 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2734 */
2735void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2736{
554891e6
JB		 2737 struct ieee80211_rx_data rx = {
2738 .sta = sta,
2739 .sdata = sta->sdata,
2740 .local = sta->local,
9e26297a
JB		 2741 /* This is OK -- must be QoS data frame */
2742 .security_idx = tid,
2743 .seqno_idx = tid,
fcf8bd3b 2744 .flags = 0,
554891e6 2745 };
2c15a0cf
CL		 2746 struct tid_ampdu_rx *tid_agg_rx;
2747
2748 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2749 if (!tid_agg_rx)
2750 return;
2bff8ebf 2751
2c15a0cf 2752 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2753 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2754 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2755
24a8fdad 2756 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2757}
2758
571ecf67
JB		 2759/* main receive path */
2760
20b01f80 2761static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2762 struct ieee80211_hdr *hdr)
2763{
20b01f80 2764 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2765 struct sk_buff *skb = rx->skb;
2766 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2767 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2768 int multicast = is_multicast_ether_addr(hdr->addr1);
2769
51fb61e7 2770 switch (sdata->vif.type) {
05c914fe 2771 case NL80211_IFTYPE_STATION:
9bc383de 2772 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2773 return 0;
77fdaa12 2774 if (!multicast &&
47846c9b 2775 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2776 if (!(sdata->dev->flags & IFF_PROMISC) ||
2777 sdata->u.mgd.use_4addr)
23a24def 2778 return 0;
554891e6 2779 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2780 }
2781 break;
05c914fe 2782 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2783 if (!bssid)
2784 return 0;
a7767f95 2785 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2786 return 1;
87291c02 2787 }
46900298 2788 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2789 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2790 return 0;
554891e6 2791 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2792 } else if (!multicast &&
47846c9b 2793 compare_ether_addr(sdata->vif.addr,
23a24def 2794 hdr->addr1) != 0) {
4150c572 2795 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2796 return 0;
554891e6 2797 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2798 } else if (!rx->sta) {
2799 int rate_idx;
eb9fb5b8 2800 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2801 rate_idx = 0; /* TODO: HT rates */
2802 else
eb9fb5b8 2803 rate_idx = status->rate_idx;
8bf11d8d
JB		 2804 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2805 BIT(rate_idx));
0fb8ca45 2806 }
23a24def 2807 break;
05c914fe 2808 case NL80211_IFTYPE_MESH_POINT:
6032f934 2809 if (!multicast &&
47846c9b 2810 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2811 hdr->addr1) != 0) {
2812 if (!(sdata->dev->flags & IFF_PROMISC))
2813 return 0;
2814
554891e6 2815 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2816 }
2817 break;
05c914fe
JB		 2818 case NL80211_IFTYPE_AP_VLAN:
2819 case NL80211_IFTYPE_AP:
23a24def 2820 if (!bssid) {
47846c9b 2821 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2822 hdr->addr1))
2823 return 0;
2824 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2825 sdata->vif.addr)) {
3df6eaea
JB		 2826 /*
2827 * Accept public action frames even when the
2828 * BSSID doesn't match, this is used for P2P
2829 * and location updates. Note that mac80211
2830 * itself never looks at these frames.
2831 */
2832 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
2833 ieee80211_is_public_action(hdr, skb->len))
2834 return 1;
771bbd09 2835 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
3df6eaea 2836 !ieee80211_is_beacon(hdr->frame_control))
23a24def 2837 return 0;
554891e6 2838 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2839 }
23a24def 2840 break;
05c914fe 2841 case NL80211_IFTYPE_WDS:
a7767f95 2842 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2843 return 0;
2844 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2845 return 0;
2846 break;
2ca27bcf 2847 default:
fb1c1cd6
JB		 2848 /* should never get here */
2849 WARN_ON(1);
2850 break;
23a24def
JB		 2851 }
2852
2853 return 1;
2854}
2855
4406c376
JB		 2856/*
2857 * This function returns whether or not the SKB
2858 * was destined for RX processing or not, which,
2859 * if consume is true, is equivalent to whether
2860 * or not the skb was consumed.
2861 */
2862static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2863 struct sk_buff *skb, bool consume)
2864{
2865 struct ieee80211_local *local = rx->local;
2866 struct ieee80211_sub_if_data *sdata = rx->sdata;
2867 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2868 struct ieee80211_hdr *hdr = (void *)skb->data;
2869 int prepares;
2870
2871 rx->skb = skb;
554891e6 2872 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2873 prepares = prepare_for_handlers(rx, hdr);
2874
2875 if (!prepares)
2876 return false;
2877
4406c376
JB		 2878 if (!consume) {
2879 skb = skb_copy(skb, GFP_ATOMIC);
2880 if (!skb) {
2881 if (net_ratelimit())
2882 wiphy_debug(local->hw.wiphy,
b305dae4 2883 "failed to copy skb for %s\n",
4406c376
JB		 2884 sdata->name);
2885 return true;
2886 }
2887
2888 rx->skb = skb;
2889 }
2890
2891 ieee80211_invoke_rx_handlers(rx);
2892 return true;
2893}
2894
571ecf67 2895/*
6368e4b1
RR		 2896 * This is the actual Rx frames handler. as it blongs to Rx path it must
2897 * be called with rcu_read_lock protection.
571ecf67 2898 */
71ebb4aa 2899static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2900 struct sk_buff *skb)
571ecf67 2901{
554891e6 2902 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2903 struct ieee80211_local *local = hw_to_local(hw);
2904 struct ieee80211_sub_if_data *sdata;
571ecf67 2905 struct ieee80211_hdr *hdr;
e3cf8b3f 2906 __le16 fc;
5cf121c3 2907 struct ieee80211_rx_data rx;
4406c376 2908 struct ieee80211_sub_if_data *prev;
56af3268 2909 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2910 int err = 0;
571ecf67 2911
e3cf8b3f 2912 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2913 memset(&rx, 0, sizeof(rx));
2914 rx.skb = skb;
2915 rx.local = local;
72abd81b 2916
e3cf8b3f 2917 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2918 local->dot11ReceivedFragmentCount++;
571ecf67 2919
142b9f50 2920 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2921 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2922 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2923
e3cf8b3f
ZY		 2924 if (ieee80211_is_mgmt(fc))
2925 err = skb_linearize(skb);
2926 else
2927 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2928
2929 if (err) {
2930 dev_kfree_skb(skb);
2931 return;
2932 }
2933
2934 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2935 ieee80211_parse_qos(&rx);
d1c3a37c 2936 ieee80211_verify_alignment(&rx);
38f3714d 2937
e3cf8b3f 2938 if (ieee80211_is_data(fc)) {
56af3268 2939 prev_sta = NULL;
4406c376 2940
7852e361 2941 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2942 if (!prev_sta) {
2943 prev_sta = sta;
2944 continue;
2945 }
2946
2947 rx.sta = prev_sta;
2948 rx.sdata = prev_sta->sdata;
4406c376 2949 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2950
56af3268 2951 prev_sta = sta;
4406c376 2952 }
56af3268
BG		 2953
2954 if (prev_sta) {
2955 rx.sta = prev_sta;
2956 rx.sdata = prev_sta->sdata;
2957
4406c376 2958 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2959 return;
8e26d5ad 2960 goto out;
56af3268 2961 }
4406c376
JB		 2962 }
2963
4b0dd98e 2964 prev = NULL;
b2e7771e 2965
4b0dd98e
JB		 2966 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2967 if (!ieee80211_sdata_running(sdata))
2968 continue;
340e11f3 2969
4b0dd98e
JB		 2970 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2971 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2972 continue;
340e11f3 2973
4b0dd98e
JB		 2974 /*
2975 * frame is destined for this interface, but if it's
2976 * not also for the previous one we handle that after
2977 * the loop to avoid copying the SKB once too much
2978 */
4bb29f8c 2979
4b0dd98e 2980 if (!prev) {
abe60632 2981 prev = sdata;
4b0dd98e 2982 continue;
340e11f3 2983 }
4bb29f8c 2984
7852e361 2985 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2986 rx.sdata = prev;
2987 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2988
4b0dd98e
JB		 2989 prev = sdata;
2990 }
2991
2992 if (prev) {
7852e361 2993 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2994 rx.sdata = prev;
4406c376 2995
4b0dd98e
JB		 2996 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2997 return;
571ecf67 2998 }
4406c376 2999
8e26d5ad 3000 out:
4406c376 3001 dev_kfree_skb(skb);
571ecf67 3002}
6368e4b1
RR		 3003
3004/*
3005 * This is the receive path handler. It is called by a low level driver when an
3006 * 802.11 MPDU is received from the hardware.
3007 */
103bf9f7 3008void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 3009{
3010 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 3011 struct ieee80211_rate *rate = NULL;
3012 struct ieee80211_supported_band *sband;
f1d58c25 3013 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 3014
d20ef63d
JB		 3015 WARN_ON_ONCE(softirq_count() == 0);
3016
77a980dc
JB		 3017 if (WARN_ON(status->band < 0 ||
3018 status->band >= IEEE80211_NUM_BANDS))
3019 goto drop;
8318d78a
JB		 3020
3021 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 3022 if (WARN_ON(!sband))
3023 goto drop;
8318d78a 3024
89c3a8ac
JB		 3025 /*
3026 * If we're suspending, it is possible although not too likely
3027 * that we'd be receiving frames after having already partially
3028 * quiesced the stack. We can't process such frames then since
3029 * that might, for example, cause stations to be added or other
3030 * driver callbacks be invoked.
3031 */
77a980dc
JB		 3032 if (unlikely(local->quiescing || local->suspended))
3033 goto drop;
89c3a8ac 3034
ea77f12f
JB		 3035 /*
3036 * The same happens when we're not even started,
3037 * but that's worth a warning.
3038 */
77a980dc
JB		 3039 if (WARN_ON(!local->started))
3040 goto drop;
ea77f12f 3041
fc885189 3042 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3043 /*
fc885189
JB		 3044 * Validate the rate, unless a PLCP error means that
3045 * we probably can't have a valid rate here anyway.
e5d6eb83 3046 */
fc885189
JB		 3047
3048 if (status->flag & RX_FLAG_HT) {
3049 /*
3050 * rate_idx is MCS index, which can be [0-76]
3051 * as documented on:
3052 *
3053 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3054 *
3055 * Anything else would be some sort of driver or
3056 * hardware error. The driver should catch hardware
3057 * errors.
3058 */
3059 if (WARN((status->rate_idx < 0 ||
3060 status->rate_idx > 76),
3061 "Rate marked as an HT rate but passed "
3062 "status->rate_idx is not "
3063 "an MCS index [0-76]: %d (0x%02x)\n",
3064 status->rate_idx,
3065 status->rate_idx))
3066 goto drop;
3067 } else {
3068 if (WARN_ON(status->rate_idx < 0 ||
3069 status->rate_idx >= sband->n_bitrates))
3070 goto drop;
3071 rate = &sband->bitrates[status->rate_idx];
3072 }
0fb8ca45 3073 }
6368e4b1 3074
554891e6
JB		 3075 status->rx_flags = 0;
3076
6368e4b1
RR		 3077 /*
3078 * key references and virtual interfaces are protected using RCU
3079 * and this requires that we are in a read-side RCU section during
3080 * receive processing
3081 */
3082 rcu_read_lock();
3083
3084 /*
3085 * Frames with failed FCS/PLCP checksum are not returned,
3086 * all other frames are returned without radiotap header
3087 * if it was previously present.
3088 * Also, frames with less than 16 bytes are dropped.
3089 */
f1d58c25 3090 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3091 if (!skb) {
3092 rcu_read_unlock();
3093 return;
3094 }
3095
e1e54068
JB		 3096 ieee80211_tpt_led_trig_rx(local,
3097 ((struct ieee80211_hdr *)skb->data)->frame_control,
3098 skb->len);
071d9ac2 3099 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3100
3101 rcu_read_unlock();
77a980dc
JB		 3102
3103 return;
3104 drop:
3105 kfree_skb(skb);
6368e4b1 3106}
103bf9f7 3107EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3108
3109/* This is a version of the rx handler that can be called from hard irq
3110 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3111void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3112{
3113 struct ieee80211_local *local = hw_to_local(hw);
3114
3115 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3116
571ecf67
JB		 3117 skb->pkt_type = IEEE80211_RX_MSG;
3118 skb_queue_tail(&local->skb_queue, skb);
3119 tasklet_schedule(&local->tasklet);
3120}
3121EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Ubuntu Hirsute Linux kernel mirror