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nl80211: allow subscribing to unexpected class3 frames
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
6ebacbb7 80 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 126 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
38f37be2 145 * MCS information is a separate field in radiotap,
73b48099
JB		 146 * added below. The byte here is needed as padding
147 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 148 */
149 *pos = 0;
8d6f658e 150 } else {
ebe6c7ba 151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 152 *pos = rate->bitrate / 5;
8d6f658e 153 }
601ae7f2
BR		 154 pos++;
155
156 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 157 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 158 pos += 2;
159 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
161 pos);
5f0b7de5
JB		 162 else if (status->flag & RX_FLAG_HT)
163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
164 pos);
9deb1ae5 165 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
167 pos);
601ae7f2 168 else
6a86b9c7
JB		 169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
170 pos);
601ae7f2
BR		 171 pos += 2;
172
173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
175 *pos = status->signal;
176 rthdr->it_present |=
177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
178 pos++;
179 }
180
601ae7f2
BR		 181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
182
183 /* IEEE80211_RADIOTAP_ANTENNA */
184 *pos = status->antenna;
185 pos++;
186
601ae7f2
BR		 187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
188
189 /* IEEE80211_RADIOTAP_RX_FLAGS */
190 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 191 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 192 pos++;
aae89831 193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
195 put_unaligned_le16(rx_flags, pos);
601ae7f2 196 pos += 2;
6d744bac
JB		 197
198 if (status->flag & RX_FLAG_HT) {
199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
201 IEEE80211_RADIOTAP_MCS_HAVE_GI |
202 IEEE80211_RADIOTAP_MCS_HAVE_BW;
203 *pos = 0;
204 if (status->flag & RX_FLAG_SHORT_GI)
205 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
206 if (status->flag & RX_FLAG_40MHZ)
207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
208 pos++;
209 *pos++ = status->rate_idx;
210 }
601ae7f2
BR		 211}
212
b2e7771e
JB		 213/*
214 * This function copies a received frame to all monitor interfaces and
215 * returns a cleaned-up SKB that no longer includes the FCS nor the
216 * radiotap header the driver might have added.
217 */
218static struct sk_buff *
219ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 220 struct ieee80211_rate *rate)
b2e7771e 221{
f1d58c25 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 223 struct ieee80211_sub_if_data *sdata;
b2e7771e 224 int needed_headroom = 0;
b2e7771e
JB		 225 struct sk_buff *skb, *skb2;
226 struct net_device *prev_dev = NULL;
227 int present_fcs_len = 0;
b2e7771e
JB		 228
229 /*
230 * First, we may need to make a copy of the skb because
231 * (1) we need to modify it for radiotap (if not present), and
232 * (2) the other RX handlers will modify the skb we got.
233 *
234 * We don't need to, of course, if we aren't going to return
235 * the SKB because it has a bad FCS/PLCP checksum.
236 */
0869aea0
JB		 237
238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
e3cf8b3f
ZY		 244 /* make sure hdr->frame_control is on the linear part */
245 if (!pskb_may_pull(origskb, 2)) {
246 dev_kfree_skb(origskb);
247 return NULL;
248 }
249
b2e7771e 250 if (!local->monitors) {
0869aea0 251 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 252 dev_kfree_skb(origskb);
253 return NULL;
254 }
255
0869aea0 256 return remove_monitor_info(local, origskb);
b2e7771e
JB		 257 }
258
0869aea0 259 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 260 /* only need to expand headroom if necessary */
261 skb = origskb;
262 origskb = NULL;
263
264 /*
265 * This shouldn't trigger often because most devices have an
266 * RX header they pull before we get here, and that should
267 * be big enough for our radiotap information. We should
268 * probably export the length to drivers so that we can have
269 * them allocate enough headroom to start with.
270 */
271 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 273 dev_kfree_skb(skb);
274 return NULL;
275 }
276 } else {
277 /*
278 * Need to make a copy and possibly remove radiotap header
279 * and FCS from the original.
280 */
281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
282
0869aea0 283 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 284
285 if (!skb)
286 return origskb;
287 }
288
0869aea0
JB		 289 /* prepend radiotap information */
290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 291
ce3edf6d 292 skb_reset_mac_header(skb);
b2e7771e
JB		 293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 skb->pkt_type = PACKET_OTHERHOST;
295 skb->protocol = htons(ETH_P_802_2);
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 299 continue;
300
3d30d949
MW		 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
9607e6b6 304 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 305 continue;
306
b2e7771e
JB		 307 if (prev_dev) {
308 skb2 = skb_clone(skb, GFP_ATOMIC);
309 if (skb2) {
310 skb2->dev = prev_dev;
5548a8a1 311 netif_receive_skb(skb2);
b2e7771e
JB		 312 }
313 }
314
315 prev_dev = sdata->dev;
316 sdata->dev->stats.rx_packets++;
317 sdata->dev->stats.rx_bytes += skb->len;
318 }
319
320 if (prev_dev) {
321 skb->dev = prev_dev;
5548a8a1 322 netif_receive_skb(skb);
b2e7771e
JB		 323 } else
324 dev_kfree_skb(skb);
325
326 return origskb;
327}
328
329
5cf121c3 330static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 331{
238f74a2 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 334 int tid, seqno_idx, security_idx;
6e0d114d
JB		 335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 341 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 342 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 343
344 seqno_idx = tid;
345 security_idx = tid;
6e0d114d 346 } else {
1411f9b5
JB		 347 /*
348 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
349 *
350 * Sequence numbers for management frames, QoS data
351 * frames with a broadcast/multicast address in the
352 * Address 1 field, and all non-QoS data frames sent
353 * by QoS STAs are assigned using an additional single
354 * modulo-4096 counter, [...]
355 *
356 * We also use that counter for non-QoS STAs.
357 */
9e26297a
JB		 358 seqno_idx = NUM_RX_DATA_QUEUES;
359 security_idx = 0;
360 if (ieee80211_is_mgmt(hdr->frame_control))
361 security_idx = NUM_RX_DATA_QUEUES;
362 tid = 0;
6e0d114d 363 }
52865dfd 364
9e26297a
JB		 365 rx->seqno_idx = seqno_idx;
366 rx->security_idx = security_idx;
6e0d114d
JB		 367 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
368 * For now, set skb->priority to 0 for other cases. */
369 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 370}
6e0d114d 371
d1c3a37c
JB		 372/**
373 * DOC: Packet alignment
374 *
375 * Drivers always need to pass packets that are aligned to two-byte boundaries
376 * to the stack.
377 *
378 * Additionally, should, if possible, align the payload data in a way that
379 * guarantees that the contained IP header is aligned to a four-byte
380 * boundary. In the case of regular frames, this simply means aligning the
381 * payload to a four-byte boundary (because either the IP header is directly
382 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 383 * in front of it). If the payload data is not properly aligned and the
384 * architecture doesn't support efficient unaligned operations, mac80211
385 * will align the data.
d1c3a37c
JB		 386 *
387 * With A-MSDU frames, however, the payload data address must yield two modulo
388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
389 * push the IP header further back to a multiple of four again. Thankfully, the
390 * specs were sane enough this time around to require padding each A-MSDU
391 * subframe to a length that is a multiple of four.
392 *
25985edc 393 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 394 * the payload is not supported, the driver is required to move the 802.11
395 * header to be directly in front of the payload in that case.
396 */
397static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 398{
59d9cb07
KV		 399#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
400 WARN_ONCE((unsigned long)rx->skb->data & 1,
401 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 402#endif
6e0d114d
JB		 403}
404
6368e4b1 405
571ecf67
JB		 406/* rx handlers */
407
49461622 408static ieee80211_rx_result debug_noinline
5cf121c3 409ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 410{
411 struct ieee80211_local *local = rx->local;
554891e6 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 413 struct sk_buff *skb = rx->skb;
414
79f460ca
LC		 415 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
416 !local->sched_scanning))
4080c7cd
JB		 417 return RX_CONTINUE;
418
b23b025f 419 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 420 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
421 local->sched_scanning)
f1d58c25 422 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 423
4080c7cd
JB		 424 /* scanning finished during invoking of handlers */
425 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
426 return RX_DROP_UNUSABLE;
571ecf67
JB		 427}
428
3cfcf6ac
JM		 429
430static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
431{
432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
433
434 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
435 return 0;
436
437 return ieee80211_is_robust_mgmt_frame(hdr);
438}
439
440
441static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
453static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
454{
455 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
456 struct ieee80211_mmie *mmie;
457
458 if (skb->len < 24 + sizeof(*mmie) ||
459 !is_multicast_ether_addr(hdr->da))
460 return -1;
461
462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
463 return -1; /* not a robust management frame */
464
465 mmie = (struct ieee80211_mmie *)
466 (skb->data + skb->len - sizeof(*mmie));
467 if (mmie->element_id != WLAN_EID_MMIE ||
468 mmie->length != sizeof(*mmie) - 2)
469 return -1;
470
471 return le16_to_cpu(mmie->key_id);
472}
473
474
33b64eb2 475static ieee80211_rx_result
5cf121c3 476ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 477{
a7767f95 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 479 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 480
a7767f95 481 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 482 if (is_multicast_ether_addr(hdr->addr1)) {
483 if (ieee80211_has_tods(hdr->frame_control) ||
484 !ieee80211_has_fromds(hdr->frame_control))
485 return RX_DROP_MONITOR;
486 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
487 return RX_DROP_MONITOR;
488 } else {
489 if (!ieee80211_has_a4(hdr->frame_control))
490 return RX_DROP_MONITOR;
491 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
492 return RX_DROP_MONITOR;
493 }
33b64eb2
LCC		 494 }
495
496 /* If there is not an established peer link and this is not a peer link
497 * establisment frame, beacon or probe, drop the frame.
498 */
499
57cf8043 500 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 501 struct ieee80211_mgmt *mgmt;
d6d1a5a7 502
a7767f95 503 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 504 return RX_DROP_MONITOR;
505
a7767f95 506 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 507 u8 category;
33b64eb2 508 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 509 category = mgmt->u.action.category;
510 if (category != WLAN_CATEGORY_MESH_ACTION &&
511 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 512 return RX_DROP_MONITOR;
33b64eb2 513 return RX_CONTINUE;
33b64eb2
LCC		 514 }
515
a7767f95
HH		 516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 518 ieee80211_is_beacon(hdr->frame_control) ||
519 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 520 return RX_CONTINUE;
521
522 return RX_DROP_MONITOR;
523
524 }
525
902acc78
JB		 526 return RX_CONTINUE;
527}
33b64eb2 528
1edfb1af
JB		 529#define SEQ_MODULO 0x1000
530#define SEQ_MASK 0xfff
531
532static inline int seq_less(u16 sq1, u16 sq2)
533{
534 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
535}
536
537static inline u16 seq_inc(u16 sq)
538{
539 return (sq + 1) & SEQ_MASK;
540}
541
542static inline u16 seq_sub(u16 sq1, u16 sq2)
543{
544 return (sq1 - sq2) & SEQ_MASK;
545}
546
547
548static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
549 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 550 int index)
1edfb1af 551{
24a8fdad 552 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 553 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 554 struct ieee80211_rx_status *status;
1edfb1af 555
dd318575
JB		 556 lockdep_assert_held(&tid_agg_rx->reorder_lock);
557
1edfb1af
JB		 558 if (!skb)
559 goto no_frame;
560
071d9ac2 561 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 562 tid_agg_rx->stored_mpdu_num--;
563 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 564 status = IEEE80211_SKB_RXCB(skb);
565 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 566 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 567
568no_frame:
569 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
570}
571
572static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
573 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 574 u16 head_seq_num)
1edfb1af
JB		 575{
576 int index;
577
dd318575
JB		 578 lockdep_assert_held(&tid_agg_rx->reorder_lock);
579
1edfb1af
JB		 580 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
581 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
582 tid_agg_rx->buf_size;
24a8fdad 583 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 584 }
585}
586
587/*
588 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
589 * the skb was added to the buffer longer than this time ago, the earlier
590 * frames that have not yet been received are assumed to be lost and the skb
591 * can be released for processing. This may also release other skb's from the
592 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 593 *
594 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 595 */
596#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
597
aa0c8636 598static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 599 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 600{
2bff8ebf 601 int index, j;
aa0c8636 602
dd318575
JB		 603 lockdep_assert_held(&tid_agg_rx->reorder_lock);
604
aa0c8636
CL		 605 /* release the buffer until next missing frame */
606 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
607 tid_agg_rx->buf_size;
608 if (!tid_agg_rx->reorder_buf[index] &&
609 tid_agg_rx->stored_mpdu_num > 1) {
610 /*
611 * No buffers ready to be released, but check whether any
612 * frames in the reorder buffer have timed out.
613 */
aa0c8636
CL		 614 int skipped = 1;
615 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
616 j = (j + 1) % tid_agg_rx->buf_size) {
617 if (!tid_agg_rx->reorder_buf[j]) {
618 skipped++;
619 continue;
620 }
499fe9a4
DH		 621 if (skipped &&
622 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 623 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 624 goto set_release_timer;
aa0c8636
CL		 625
626#ifdef CONFIG_MAC80211_HT_DEBUG
627 if (net_ratelimit())
0fb9a9ec
JP		 628 wiphy_debug(hw->wiphy,
629 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 630#endif
24a8fdad 631 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 632
633 /*
634 * Increment the head seq# also for the skipped slots.
635 */
636 tid_agg_rx->head_seq_num =
637 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
638 skipped = 0;
639 }
640 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 641 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 642 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
643 tid_agg_rx->buf_size;
644 }
2bff8ebf
CL		 645
646 if (tid_agg_rx->stored_mpdu_num) {
647 j = index = seq_sub(tid_agg_rx->head_seq_num,
648 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
649
650 for (; j != (index - 1) % tid_agg_rx->buf_size;
651 j = (j + 1) % tid_agg_rx->buf_size) {
652 if (tid_agg_rx->reorder_buf[j])
653 break;
654 }
655
656 set_release_timer:
657
658 mod_timer(&tid_agg_rx->reorder_timer,
334df731 659 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 660 HT_RX_REORDER_BUF_TIMEOUT);
661 } else {
662 del_timer(&tid_agg_rx->reorder_timer);
663 }
aa0c8636
CL		 664}
665
1edfb1af
JB		 666/*
667 * As this function belongs to the RX path it must be under
668 * rcu_read_lock protection. It returns false if the frame
669 * can be processed immediately, true if it was consumed.
670 */
671static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
672 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 673 struct sk_buff *skb)
1edfb1af
JB		 674{
675 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
676 u16 sc = le16_to_cpu(hdr->seq_ctrl);
677 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
678 u16 head_seq_num, buf_size;
679 int index;
2bff8ebf 680 bool ret = true;
1edfb1af 681
dd318575
JB		 682 spin_lock(&tid_agg_rx->reorder_lock);
683
1edfb1af
JB		 684 buf_size = tid_agg_rx->buf_size;
685 head_seq_num = tid_agg_rx->head_seq_num;
686
687 /* frame with out of date sequence number */
688 if (seq_less(mpdu_seq_num, head_seq_num)) {
689 dev_kfree_skb(skb);
2bff8ebf 690 goto out;
1edfb1af
JB		 691 }
692
693 /*
694 * If frame the sequence number exceeds our buffering window
695 * size release some previous frames to make room for this one.
696 */
697 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
698 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
699 /* release stored frames up to new head to stack */
24a8fdad 700 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 701 }
702
703 /* Now the new frame is always in the range of the reordering buffer */
704
705 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
706
707 /* check if we already stored this frame */
708 if (tid_agg_rx->reorder_buf[index]) {
709 dev_kfree_skb(skb);
2bff8ebf 710 goto out;
1edfb1af
JB		 711 }
712
713 /*
714 * If the current MPDU is in the right order and nothing else
715 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 716 * If it is first but there's something stored, we may be able
717 * to release frames after this one.
1edfb1af
JB		 718 */
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 722 ret = false;
723 goto out;
1edfb1af
JB		 724 }
725
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
24a8fdad 730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 731
2bff8ebf
CL		 732 out:
733 spin_unlock(&tid_agg_rx->reorder_lock);
734 return ret;
1edfb1af
JB		 735}
736
737/*
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
740 */
24a8fdad 741static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 742{
2569a826
JB		 743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 747 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 748 struct sta_info *sta = rx->sta;
1edfb1af
JB		 749 struct tid_ampdu_rx *tid_agg_rx;
750 u16 sc;
6cc00d54 751 u8 tid, ack_policy;
1edfb1af
JB		 752
753 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 754 goto dont_reorder;
1edfb1af
JB		 755
756 /*
757 * filter the QoS data rx stream according to
758 * STA/TID and check if this STA/TID is on aggregation
759 */
760
1edfb1af 761 if (!sta)
2569a826 762 goto dont_reorder;
1edfb1af 763
6cc00d54
TP		 764 ack_policy = *ieee80211_get_qos_ctl(hdr) &
765 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 766 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
767
a87f736d
JB		 768 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
769 if (!tid_agg_rx)
770 goto dont_reorder;
1edfb1af
JB		 771
772 /* qos null data frames are excluded */
773 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 774 goto dont_reorder;
1edfb1af 775
6cc00d54
TP		 776 /* not part of a BA session */
777 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
778 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
779 goto dont_reorder;
780
660c6a44
TP		 781 /* not actually part of this BA session */
782 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
783 goto dont_reorder;
784
1edfb1af
JB		 785 /* new, potentially un-ordered, ampdu frame - process it */
786
787 /* reset session timer */
788 if (tid_agg_rx->timeout)
789 mod_timer(&tid_agg_rx->session_timer,
790 TU_TO_EXP_TIME(tid_agg_rx->timeout));
791
792 /* if this mpdu is fragmented - terminate rx aggregation session */
793 sc = le16_to_cpu(hdr->seq_ctrl);
794 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 795 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 796 skb_queue_tail(&rx->sdata->skb_queue, skb);
797 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 798 return;
1edfb1af
JB		 799 }
800
a87f736d
JB		 801 /*
802 * No locking needed -- we will only ever process one
803 * RX packet at a time, and thus own tid_agg_rx. All
804 * other code manipulating it needs to (and does) make
805 * sure that we cannot get to it any more before doing
806 * anything with it.
807 */
24a8fdad 808 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 809 return;
810
811 dont_reorder:
24a8fdad 812 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 813}
33b64eb2 814
49461622 815static ieee80211_rx_result debug_noinline
5cf121c3 816ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 817{
a7767f95 818 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 819 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 820
821 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
822 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 823 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 824 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 825 hdr->seq_ctrl)) {
554891e6 826 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 827 rx->local->dot11FrameDuplicateCount++;
828 rx->sta->num_duplicates++;
829 }
b1f93314 830 return RX_DROP_UNUSABLE;
571ecf67 831 } else
9e26297a 832 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 833 }
834
571ecf67
JB		 835 if (unlikely(rx->skb->len < 16)) {
836 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 837 return RX_DROP_MONITOR;
571ecf67
JB		 838 }
839
571ecf67
JB		 840 /* Drop disallowed frame classes based on STA auth/assoc state;
841 * IEEE 802.11, Chap 5.5.
842 *
ccd7b362
JB		 843 * mac80211 filters only based on association state, i.e. it drops
844 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 845 * deauth/disassoc frames when needed. In addition, hostapd is
846 * responsible for filtering on both auth and assoc states.
847 */
33b64eb2 848
902acc78 849 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 850 return ieee80211_rx_mesh_check(rx);
33b64eb2 851
a7767f95
HH		 852 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
853 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 854 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 855 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 856 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
2a33bee2
GE		 857 if (rx->sta && rx->sta->dummy &&
858 ieee80211_is_data_present(hdr->frame_control)) {
859 u16 ethertype;
860 u8 *payload;
861
862 payload = rx->skb->data +
863 ieee80211_hdrlen(hdr->frame_control);
864 ethertype = (payload[6] << 8) | payload[7];
865 if (cpu_to_be16(ethertype) ==
866 rx->sdata->control_port_protocol)
867 return RX_CONTINUE;
868 }
e4c26add 869 return RX_DROP_MONITOR;
2a33bee2 870 }
571ecf67 871
9ae54c84 872 return RX_CONTINUE;
570bd537
JB		 873}
874
875
49461622 876static ieee80211_rx_result debug_noinline
5cf121c3 877ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 878{
eb9fb5b8
JB		 879 struct sk_buff *skb = rx->skb;
880 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
881 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 882 int keyidx;
883 int hdrlen;
e4c26add 884 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 885 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 886 int mmie_keyidx = -1;
761ab470 887 __le16 fc;
570bd537 888
3017b80b
JB		 889 /*
890 * Key selection 101
891 *
3cfcf6ac 892 * There are four types of keys:
3017b80b 893 * - GTK (group keys)
3cfcf6ac 894 * - IGTK (group keys for management frames)
3017b80b
JB		 895 * - PTK (pairwise keys)
896 * - STK (station-to-station pairwise keys)
897 *
898 * When selecting a key, we have to distinguish between multicast
899 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 900 * use PTKs and STKs while the former always use GTKs and IGTKs.
901 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
902 * unicast frames can also use key indices like GTKs. Hence, if we
903 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 904 *
8dc06a1c
JB		 905 * Note that in a regular BSS, multicast frames are sent by the
906 * AP only, associated stations unicast the frame to the AP first
907 * which then multicasts it on their behalf.
908 *
3017b80b
JB		 909 * There is also a slight problem in IBSS mode: GTKs are negotiated
910 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 911 * The spec seems to expect that one negotiates the same key with
912 * every station but there's no such requirement; VLANs could be
913 * possible.
3017b80b
JB		 914 */
915
3017b80b 916 /*
1990af8d 917 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 918 * addressed to us nor a multicast frame.
919 */
554891e6 920 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 921 return RX_CONTINUE;
3017b80b 922
2569a826
JB		 923 /* start without a key */
924 rx->key = NULL;
925
d4e46a3d 926 if (rx->sta)
e31b8213 927 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 928
761ab470
JB		 929 fc = hdr->frame_control;
930
931 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 932 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
933
e31b8213
JB		 934 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
935 rx->key = sta_ptk;
dc1580dd
JB		 936 if ((status->flag & RX_FLAG_DECRYPTED) &&
937 (status->flag & RX_FLAG_IV_STRIPPED))
938 return RX_CONTINUE;
0c7c10c7 939 /* Skip decryption if the frame is not protected. */
761ab470 940 if (!ieee80211_has_protected(fc))
0c7c10c7 941 return RX_CONTINUE;
3cfcf6ac
JM		 942 } else if (mmie_keyidx >= 0) {
943 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 944 if ((status->flag & RX_FLAG_DECRYPTED) &&
945 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 946 return RX_CONTINUE;
947
948 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
949 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
950 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 951 if (rx->sta)
952 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
953 if (!rx->key)
954 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 955 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 956 /*
957 * The frame was not protected, so skip decryption. However, we
958 * need to set rx->key if there is a key that could have been
959 * used so that the frame may be dropped if encryption would
960 * have been expected.
961 */
962 struct ieee80211_key *key = NULL;
897bed8b
JB		 963 struct ieee80211_sub_if_data *sdata = rx->sdata;
964 int i;
965
761ab470 966 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 967 is_multicast_ether_addr(hdr->addr1) &&
968 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
969 rx->key = key;
897bed8b
JB		 970 else {
971 if (rx->sta) {
972 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
973 key = rcu_dereference(rx->sta->gtk[i]);
974 if (key)
975 break;
976 }
977 }
978 if (!key) {
979 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
980 key = rcu_dereference(sdata->keys[i]);
981 if (key)
982 break;
983 }
984 }
985 if (key)
986 rx->key = key;
987 }
0c7c10c7 988 return RX_CONTINUE;
571ecf67 989 } else {
39184b15 990 u8 keyid;
3017b80b
JB		 991 /*
992 * The device doesn't give us the IV so we won't be
993 * able to look up the key. That's ok though, we
994 * don't need to decrypt the frame, we just won't
995 * be able to keep statistics accurate.
996 * Except for key threshold notifications, should
997 * we somehow allow the driver to tell us which key
998 * the hardware used if this flag is set?
999 */
eb9fb5b8
JB		 1000 if ((status->flag & RX_FLAG_DECRYPTED) &&
1001 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1002 return RX_CONTINUE;
3017b80b 1003
761ab470 1004 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1005
1006 if (rx->skb->len < 8 + hdrlen)
e4c26add 1007 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1008
1009 /*
1010 * no need to call ieee80211_wep_get_keyidx,
1011 * it verifies a bunch of things we've done already
1012 */
39184b15
ZY		 1013 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1014 keyidx = keyid >> 6;
3017b80b 1015
e31b8213
JB		 1016 /* check per-station GTK first, if multicast packet */
1017 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1018 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1019
e31b8213
JB		 1020 /* if not found, try default key */
1021 if (!rx->key) {
1022 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1023
1024 /*
1025 * RSNA-protected unicast frames should always be
1026 * sent with pairwise or station-to-station keys,
1027 * but for WEP we allow using a key index as well.
1028 */
1029 if (rx->key &&
1030 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1031 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1032 !is_multicast_ether_addr(hdr->addr1))
1033 rx->key = NULL;
1034 }
571ecf67
JB		 1035 }
1036
3017b80b 1037 if (rx->key) {
95acac61
JB		 1038 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1039 return RX_DROP_MONITOR;
1040
571ecf67 1041 rx->key->tx_rx_count++;
011bfcc4 1042 /* TODO: add threshold stuff again */
1990af8d 1043 } else {
e4c26add 1044 return RX_DROP_MONITOR;
70f08765
JB		 1045 }
1046
39184b15
ZY		 1047 if (skb_linearize(rx->skb))
1048 return RX_DROP_UNUSABLE;
761ab470 1049 /* the hdr variable is invalid now! */
1990af8d 1050
97359d12
JB		 1051 switch (rx->key->conf.cipher) {
1052 case WLAN_CIPHER_SUITE_WEP40:
1053 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1054 /* Check for weak IVs if possible */
1055 if (rx->sta && ieee80211_is_data(fc) &&
1056 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1057 !(status->flag & RX_FLAG_DECRYPTED)) &&
1058 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1059 rx->sta->wep_weak_iv_count++;
1060
e2f036da
MN		 1061 result = ieee80211_crypto_wep_decrypt(rx);
1062 break;
97359d12 1063 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1064 result = ieee80211_crypto_tkip_decrypt(rx);
1065 break;
97359d12 1066 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1067 result = ieee80211_crypto_ccmp_decrypt(rx);
1068 break;
97359d12 1069 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1070 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1071 break;
3ffc2a90
JB		 1072 default:
1073 /*
1074 * We can reach here only with HW-only algorithms
1075 * but why didn't it decrypt the frame?!
1076 */
1077 return RX_DROP_UNUSABLE;
70f08765
JB		 1078 }
1079
e2f036da 1080 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1081 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1082
1083 return result;
70f08765
JB		 1084}
1085
572e0012
KV		 1086static ieee80211_rx_result debug_noinline
1087ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1088{
1089 struct ieee80211_local *local;
1090 struct ieee80211_hdr *hdr;
1091 struct sk_buff *skb;
1092
1093 local = rx->local;
1094 skb = rx->skb;
1095 hdr = (struct ieee80211_hdr *) skb->data;
1096
1097 if (!local->pspolling)
1098 return RX_CONTINUE;
1099
1100 if (!ieee80211_has_fromds(hdr->frame_control))
1101 /* this is not from AP */
1102 return RX_CONTINUE;
1103
1104 if (!ieee80211_is_data(hdr->frame_control))
1105 return RX_CONTINUE;
1106
1107 if (!ieee80211_has_moredata(hdr->frame_control)) {
1108 /* AP has no more frames buffered for us */
1109 local->pspolling = false;
1110 return RX_CONTINUE;
1111 }
1112
1113 /* more data bit is set, let's request a new frame from the AP */
1114 ieee80211_send_pspoll(local, rx->sdata);
1115
1116 return RX_CONTINUE;
1117}
1118
133b8226 1119static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1120{
133b8226 1121 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1122 struct ieee80211_local *local = sdata->local;
0795af57 1123
3e122be0 1124 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1125 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1126 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1127 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1128#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1129 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1130 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1131#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1132}
1133
ff9458d3 1134static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1135{
133b8226 1136 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1137
3e122be0 1138 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1139
571ecf67 1140#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1141 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1142 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1143#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1144
c2c98fde 1145 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1146#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1147 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1148 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1149#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1150 return;
1151 }
1152
1153 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1154}
1155
d057e5a3
AN		 1156int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1157{
1158 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1159 bool in_ps;
1160
1161 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1162
1163 /* Don't let the same PS state be set twice */
c2c98fde 1164 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1165 if ((start && in_ps) || (!start && !in_ps))
1166 return -EINVAL;
1167
1168 if (start)
1169 ap_sta_ps_start(sta_inf);
1170 else
1171 ap_sta_ps_end(sta_inf);
1172
1173 return 0;
1174}
1175EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1176
47086fc5
JB		 1177static ieee80211_rx_result debug_noinline
1178ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1179{
1180 struct ieee80211_sub_if_data *sdata = rx->sdata;
1181 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1182 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1183 int tid, ac;
1184
1185 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1186 return RX_CONTINUE;
1187
1188 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1189 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1190 return RX_CONTINUE;
1191
1192 /*
1193 * The device handles station powersave, so don't do anything about
1194 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1195 * it to mac80211 since they're handled.)
1196 */
1197 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1198 return RX_CONTINUE;
1199
1200 /*
1201 * Don't do anything if the station isn't already asleep. In
1202 * the uAPSD case, the station will probably be marked asleep,
1203 * in the PS-Poll case the station must be confused ...
1204 */
c2c98fde 1205 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1206 return RX_CONTINUE;
1207
1208 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1209 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1210 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1211 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1212 else
c2c98fde 1213 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1214 }
47086fc5
JB		 1215
1216 /* Free PS Poll skb here instead of returning RX_DROP that would
1217 * count as an dropped frame. */
1218 dev_kfree_skb(rx->skb);
1219
1220 return RX_QUEUED;
1221 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1222 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1223 ieee80211_has_pm(hdr->frame_control) &&
1224 (ieee80211_is_data_qos(hdr->frame_control) ||
1225 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1226 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1227 ac = ieee802_1d_to_ac[tid & 7];
1228
1229 /*
1230 * If this AC is not trigger-enabled do nothing.
1231 *
1232 * NB: This could/should check a separate bitmap of trigger-
1233 * enabled queues, but for now we only implement uAPSD w/o
1234 * TSPEC changes to the ACs, so they're always the same.
1235 */
1236 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1237 return RX_CONTINUE;
1238
1239 /* if we are in a service period, do nothing */
c2c98fde 1240 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1241 return RX_CONTINUE;
1242
c2c98fde 1243 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1244 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1245 else
c2c98fde 1246 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1247 }
1248
1249 return RX_CONTINUE;
1250}
1251
49461622 1252static ieee80211_rx_result debug_noinline
5cf121c3 1253ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1254{
1255 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1256 struct sk_buff *skb = rx->skb;
1257 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1258 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1259
1260 if (!sta)
9ae54c84 1261 return RX_CONTINUE;
571ecf67 1262
b291ba11
JB		 1263 /*
1264 * Update last_rx only for IBSS packets which are for the current
1265 * BSSID to avoid keeping the current IBSS network alive in cases
1266 * where other STAs start using different BSSID.
1267 */
05c914fe 1268 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1269 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1270 NL80211_IFTYPE_ADHOC);
3af6334c 1271 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1272 sta->last_rx = jiffies;
3af6334c
FF		 1273 if (ieee80211_is_data(hdr->frame_control)) {
1274 sta->last_rx_rate_idx = status->rate_idx;
1275 sta->last_rx_rate_flag = status->flag;
1276 }
1277 }
b291ba11
JB		 1278 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1279 /*
33b64eb2
LCC		 1280 * Mesh beacons will update last_rx when if they are found to
1281 * match the current local configuration when processed.
571ecf67 1282 */
b291ba11 1283 sta->last_rx = jiffies;
3af6334c
FF		 1284 if (ieee80211_is_data(hdr->frame_control)) {
1285 sta->last_rx_rate_idx = status->rate_idx;
1286 sta->last_rx_rate_flag = status->flag;
1287 }
571ecf67
JB		 1288 }
1289
554891e6 1290 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1291 return RX_CONTINUE;
571ecf67 1292
3cf335d5
KV		 1293 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1294 ieee80211_sta_rx_notify(rx->sdata, hdr);
1295
571ecf67
JB		 1296 sta->rx_fragments++;
1297 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1298 sta->last_signal = status->signal;
541a45a1 1299 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1300
72eaa43a
JB		 1301 /*
1302 * Change STA power saving mode only at the end of a frame
1303 * exchange sequence.
1304 */
d057e5a3
AN		 1305 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1306 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1307 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1308 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1309 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1310 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1311 /*
1312 * Ignore doze->wake transitions that are
1313 * indicated by non-data frames, the standard
1314 * is unclear here, but for example going to
1315 * PS mode and then scanning would cause a
1316 * doze->wake transition for the probe request,
1317 * and that is clearly undesirable.
1318 */
1319 if (ieee80211_is_data(hdr->frame_control) &&
1320 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1321 ap_sta_ps_end(sta);
72eaa43a
JB		 1322 } else {
1323 if (ieee80211_has_pm(hdr->frame_control))
1324 ap_sta_ps_start(sta);
1325 }
571ecf67
JB		 1326 }
1327
22403def
JB		 1328 /*
1329 * Drop (qos-)data::nullfunc frames silently, since they
1330 * are used only to control station power saving mode.
1331 */
1332 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1333 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1334 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1335
1336 /*
1337 * If we receive a 4-addr nullfunc frame from a STA
1338 * that was not moved to a 4-addr STA vlan yet, drop
1339 * the frame to the monitor interface, to make sure
1340 * that hostapd sees it
1341 */
1342 if (ieee80211_has_a4(hdr->frame_control) &&
1343 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1344 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1345 !rx->sdata->u.vlan.sta)))
1346 return RX_DROP_MONITOR;
22403def
JB		 1347 /*
1348 * Update counter and free packet here to avoid
1349 * counting this as a dropped packed.
1350 */
571ecf67
JB		 1351 sta->rx_packets++;
1352 dev_kfree_skb(rx->skb);
9ae54c84 1353 return RX_QUEUED;
571ecf67
JB		 1354 }
1355
9ae54c84 1356 return RX_CONTINUE;
571ecf67
JB		 1357} /* ieee80211_rx_h_sta_process */
1358
571ecf67
JB		 1359static inline struct ieee80211_fragment_entry *
1360ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1361 unsigned int frag, unsigned int seq, int rx_queue,
1362 struct sk_buff **skb)
1363{
1364 struct ieee80211_fragment_entry *entry;
1365 int idx;
1366
1367 idx = sdata->fragment_next;
1368 entry = &sdata->fragments[sdata->fragment_next++];
1369 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1370 sdata->fragment_next = 0;
1371
1372 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1373#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1374 struct ieee80211_hdr *hdr =
1375 (struct ieee80211_hdr *) entry->skb_list.next->data;
1376 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1377 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1378 "addr1=%pM addr2=%pM\n",
47846c9b 1379 sdata->name, idx,
571ecf67 1380 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1381 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1382#endif
571ecf67
JB		 1383 __skb_queue_purge(&entry->skb_list);
1384 }
1385
1386 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1387 *skb = NULL;
1388 entry->first_frag_time = jiffies;
1389 entry->seq = seq;
1390 entry->rx_queue = rx_queue;
1391 entry->last_frag = frag;
1392 entry->ccmp = 0;
1393 entry->extra_len = 0;
1394
1395 return entry;
1396}
1397
1398static inline struct ieee80211_fragment_entry *
1399ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1400 unsigned int frag, unsigned int seq,
571ecf67
JB		 1401 int rx_queue, struct ieee80211_hdr *hdr)
1402{
1403 struct ieee80211_fragment_entry *entry;
1404 int i, idx;
1405
1406 idx = sdata->fragment_next;
1407 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1408 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1409
1410 idx--;
1411 if (idx < 0)
1412 idx = IEEE80211_FRAGMENT_MAX - 1;
1413
1414 entry = &sdata->fragments[idx];
1415 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1416 entry->rx_queue != rx_queue ||
1417 entry->last_frag + 1 != frag)
1418 continue;
1419
b73d70ad 1420 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1421
b73d70ad
HH		 1422 /*
1423 * Check ftype and addresses are equal, else check next fragment
1424 */
1425 if (((hdr->frame_control ^ f_hdr->frame_control) &
1426 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1427 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1428 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1429 continue;
1430
ab46623e 1431 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1432 __skb_queue_purge(&entry->skb_list);
1433 continue;
1434 }
1435 return entry;
1436 }
1437
1438 return NULL;
1439}
1440
49461622 1441static ieee80211_rx_result debug_noinline
5cf121c3 1442ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1443{
1444 struct ieee80211_hdr *hdr;
1445 u16 sc;
358c8d9d 1446 __le16 fc;
571ecf67
JB		 1447 unsigned int frag, seq;
1448 struct ieee80211_fragment_entry *entry;
1449 struct sk_buff *skb;
554891e6 1450 struct ieee80211_rx_status *status;
571ecf67 1451
b73d70ad 1452 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1453 fc = hdr->frame_control;
571ecf67
JB		 1454 sc = le16_to_cpu(hdr->seq_ctrl);
1455 frag = sc & IEEE80211_SCTL_FRAG;
1456
358c8d9d 1457 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1458 (rx->skb)->len < 24 ||
1459 is_multicast_ether_addr(hdr->addr1))) {
1460 /* not fragmented */
1461 goto out;
1462 }
1463 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1464
e3cf8b3f
ZY		 1465 if (skb_linearize(rx->skb))
1466 return RX_DROP_UNUSABLE;
1467
058897a4
AK		 1468 /*
1469 * skb_linearize() might change the skb->data and
1470 * previously cached variables (in this case, hdr) need to
1471 * be refreshed with the new data.
1472 */
1473 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1474 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1475
1476 if (frag == 0) {
1477 /* This is the first fragment of a new frame. */
1478 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1479 rx->seqno_idx, &(rx->skb));
97359d12 1480 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1481 ieee80211_has_protected(fc)) {
9e26297a 1482 int queue = rx->security_idx;
571ecf67
JB		 1483 /* Store CCMP PN so that we can verify that the next
1484 * fragment has a sequential PN value. */
1485 entry->ccmp = 1;
1486 memcpy(entry->last_pn,
9190252c 1487 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1488 CCMP_PN_LEN);
1489 }
9ae54c84 1490 return RX_QUEUED;
571ecf67
JB		 1491 }
1492
1493 /* This is a fragment for a frame that should already be pending in
1494 * fragment cache. Add this fragment to the end of the pending entry.
1495 */
9e26297a
JB		 1496 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1497 rx->seqno_idx, hdr);
571ecf67
JB		 1498 if (!entry) {
1499 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1500 return RX_DROP_MONITOR;
571ecf67
JB		 1501 }
1502
1503 /* Verify that MPDUs within one MSDU have sequential PN values.
1504 * (IEEE 802.11i, 8.3.3.4.5) */
1505 if (entry->ccmp) {
1506 int i;
1507 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1508 int queue;
97359d12 1509 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1510 return RX_DROP_UNUSABLE;
571ecf67
JB		 1511 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1512 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1513 pn[i]++;
1514 if (pn[i])
1515 break;
1516 }
9e26297a 1517 queue = rx->security_idx;
9190252c 1518 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1519 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1520 return RX_DROP_UNUSABLE;
571ecf67
JB		 1521 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1522 }
1523
358c8d9d 1524 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1525 __skb_queue_tail(&entry->skb_list, rx->skb);
1526 entry->last_frag = frag;
1527 entry->extra_len += rx->skb->len;
358c8d9d 1528 if (ieee80211_has_morefrags(fc)) {
571ecf67 1529 rx->skb = NULL;
9ae54c84 1530 return RX_QUEUED;
571ecf67
JB		 1531 }
1532
1533 rx->skb = __skb_dequeue(&entry->skb_list);
1534 if (skb_tailroom(rx->skb) < entry->extra_len) {
1535 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1536 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1537 GFP_ATOMIC))) {
1538 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1539 __skb_queue_purge(&entry->skb_list);
e4c26add 1540 return RX_DROP_UNUSABLE;
571ecf67
JB		 1541 }
1542 }
1543 while ((skb = __skb_dequeue(&entry->skb_list))) {
1544 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1545 dev_kfree_skb(skb);
1546 }
1547
1548 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1549 status = IEEE80211_SKB_RXCB(rx->skb);
1550 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1551
1552 out:
1553 if (rx->sta)
1554 rx->sta->rx_packets++;
1555 if (is_multicast_ether_addr(hdr->addr1))
1556 rx->local->dot11MulticastReceivedFrameCount++;
1557 else
1558 ieee80211_led_rx(rx->local);
9ae54c84 1559 return RX_CONTINUE;
571ecf67
JB		 1560}
1561
49461622 1562static ieee80211_rx_result debug_noinline
5cf121c3 1563ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1564{
6e0d114d 1565 u8 *data = rx->skb->data;
238f74a2 1566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1567
238f74a2 1568 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1569 return RX_CONTINUE;
6e0d114d
JB		 1570
1571 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1572 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1573 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1574 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1575 /* change frame type to non QOS */
238f74a2 1576 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1577
9ae54c84 1578 return RX_CONTINUE;
6e0d114d
JB		 1579}
1580
76ee65bf 1581static int
5cf121c3 1582ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1583{
07346f81 1584 if (unlikely(!rx->sta ||
c2c98fde 1585 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1586 return -EACCES;
571ecf67 1587
76ee65bf 1588 return 0;
571ecf67
JB		 1589}
1590
76ee65bf 1591static int
358c8d9d 1592ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1593{
eb9fb5b8
JB		 1594 struct sk_buff *skb = rx->skb;
1595 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1596
3017b80b 1597 /*
7848ba7d
JB		 1598 * Pass through unencrypted frames if the hardware has
1599 * decrypted them already.
3017b80b 1600 */
eb9fb5b8 1601 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1602 return 0;
571ecf67
JB		 1603
1604 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1605 if (unlikely(!ieee80211_has_protected(fc) &&
1606 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1607 ieee80211_is_data(fc) &&
b3fc9c6c 1608 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1609 return -EACCES;
bef5d1c7
JB		 1610
1611 return 0;
1612}
1613
1614static int
1615ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1616{
1617 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1618 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1619 __le16 fc = hdr->frame_control;
bef5d1c7 1620
e3efca0a
JM		 1621 /*
1622 * Pass through unencrypted frames if the hardware has
1623 * decrypted them already.
1624 */
1625 if (status->flag & RX_FLAG_DECRYPTED)
1626 return 0;
bef5d1c7 1627
c2c98fde 1628 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1629 if (unlikely(!ieee80211_has_protected(fc) &&
1630 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1631 rx->key)) {
1632 if (ieee80211_is_deauth(fc))
1633 cfg80211_send_unprot_deauth(rx->sdata->dev,
1634 rx->skb->data,
1635 rx->skb->len);
1636 else if (ieee80211_is_disassoc(fc))
1637 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1638 rx->skb->data,
1639 rx->skb->len);
f2ca3ea4 1640 return -EACCES;
cf4e594e 1641 }
f2ca3ea4 1642 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1643 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1644 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1645 if (ieee80211_is_deauth(fc))
1646 cfg80211_send_unprot_deauth(rx->sdata->dev,
1647 rx->skb->data,
1648 rx->skb->len);
1649 else if (ieee80211_is_disassoc(fc))
1650 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1651 rx->skb->data,
1652 rx->skb->len);
f2ca3ea4 1653 return -EACCES;
cf4e594e 1654 }
f2ca3ea4
JM		 1655 /*
1656 * When using MFP, Action frames are not allowed prior to
1657 * having configured keys.
1658 */
1659 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1660 ieee80211_is_robust_mgmt_frame(
1661 (struct ieee80211_hdr *) rx->skb->data)))
1662 return -EACCES;
1663 }
b3fc9c6c 1664
76ee65bf 1665 return 0;
571ecf67
JB		 1666}
1667
76ee65bf 1668static int
4114fa21 1669__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1670{
eb9fb5b8 1671 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1672 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1673 bool check_port_control = false;
1674 struct ethhdr *ehdr;
1675 int ret;
f14543ee 1676
4114fa21 1677 *port_control = false;
9bc383de
JB		 1678 if (ieee80211_has_a4(hdr->frame_control) &&
1679 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1680 return -1;
9bc383de 1681
fbb327c5
FF		 1682 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1683 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1684
1685 if (!sdata->u.mgd.use_4addr)
1686 return -1;
1687 else
1688 check_port_control = true;
1689 }
1690
9bc383de 1691 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1692 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1693 return -1;
571ecf67 1694
fbb327c5 1695 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1696 if (ret < 0)
fbb327c5
FF		 1697 return ret;
1698
1699 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1700 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1701 *port_control = true;
1702 else if (check_port_control)
fbb327c5
FF		 1703 return -1;
1704
1705 return 0;
76ee65bf 1706}
571ecf67 1707
ce3edf6d
JB		 1708/*
1709 * requires that rx->skb is a frame with ethernet header
1710 */
358c8d9d 1711static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1712{
c97c23e3 1713 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1714 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1715 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1716
1717 /*
1718 * Allow EAPOL frames to us/the PAE group address regardless
1719 * of whether the frame was encrypted or not.
1720 */
a621fa4d 1721 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1722 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1723 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1724 return true;
1725
1726 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1727 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1728 return false;
1729
1730 return true;
1731}
1732
1733/*
1734 * requires that rx->skb is a frame with ethernet header
1735 */
76ee65bf 1736static void
5cf121c3 1737ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1738{
eb9fb5b8
JB		 1739 struct ieee80211_sub_if_data *sdata = rx->sdata;
1740 struct net_device *dev = sdata->dev;
76ee65bf 1741 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1742 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1743 struct sta_info *dsta;
554891e6 1744 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1745
76ee65bf
RR		 1746 skb = rx->skb;
1747 xmit_skb = NULL;
571ecf67 1748
05c914fe
JB		 1749 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1750 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1751 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1752 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1753 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1754 if (is_multicast_ether_addr(ehdr->h_dest)) {
1755 /*
1756 * send multicast frames both to higher layers in
1757 * local net stack and back to the wireless medium
1758 */
76ee65bf
RR		 1759 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1760 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1761 printk(KERN_DEBUG "%s: failed to clone "
1762 "multicast frame\n", dev->name);
1763 } else {
abe60632
JB		 1764 dsta = sta_info_get(sdata, skb->data);
1765 if (dsta) {
ce3edf6d
JB		 1766 /*
1767 * The destination station is associated to
1768 * this AP (in this VLAN), so send the frame
1769 * directly to it and do not pass it to local
1770 * net stack.
571ecf67 1771 */
76ee65bf 1772 xmit_skb = skb;
571ecf67
JB		 1773 skb = NULL;
1774 }
571ecf67
JB		 1775 }
1776 }
1777
1778 if (skb) {
d1c3a37c
JB		 1779 int align __maybe_unused;
1780
59d9cb07 1781#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1782 /*
1783 * 'align' will only take the values 0 or 2 here
1784 * since all frames are required to be aligned
1785 * to 2-byte boundaries when being passed to
1786 * mac80211. That also explains the __skb_push()
1787 * below.
1788 */
dacb6f1d 1789 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1790 if (align) {
1791 if (WARN_ON(skb_headroom(skb) < 3)) {
1792 dev_kfree_skb(skb);
1793 skb = NULL;
1794 } else {
1795 u8 *data = skb->data;
8ce0b589
ZY		 1796 size_t len = skb_headlen(skb);
1797 skb->data -= align;
1798 memmove(skb->data, data, len);
1799 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1800 }
1801 }
1802#endif
1803
1804 if (skb) {
1805 /* deliver to local stack */
1806 skb->protocol = eth_type_trans(skb, dev);
1807 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1808 netif_receive_skb(skb);
d1c3a37c 1809 }
571ecf67
JB		 1810 }
1811
76ee65bf 1812 if (xmit_skb) {
571ecf67 1813 /* send to wireless media */
f831e909 1814 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1815 skb_reset_network_header(xmit_skb);
1816 skb_reset_mac_header(xmit_skb);
76ee65bf 1817 dev_queue_xmit(xmit_skb);
571ecf67 1818 }
76ee65bf
RR		 1819}
1820
49461622 1821static ieee80211_rx_result debug_noinline
5cf121c3 1822ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1823{
eb9fb5b8 1824 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1825 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1827 __le16 fc = hdr->frame_control;
eaf85ca7 1828 struct sk_buff_head frame_list;
554891e6 1829 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1830
358c8d9d 1831 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1832 return RX_CONTINUE;
fd4c7f2f 1833
358c8d9d 1834 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1835 return RX_DROP_MONITOR;
fd4c7f2f 1836
554891e6 1837 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1838 return RX_CONTINUE;
fd4c7f2f 1839
eaf85ca7
ZY		 1840 if (ieee80211_has_a4(hdr->frame_control) &&
1841 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1842 !rx->sdata->u.vlan.sta)
e4c26add 1843 return RX_DROP_UNUSABLE;
fd4c7f2f 1844
eaf85ca7
ZY		 1845 if (is_multicast_ether_addr(hdr->addr1) &&
1846 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1847 rx->sdata->u.vlan.sta) ||
1848 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1849 rx->sdata->u.mgd.use_4addr)))
e4c26add 1850 return RX_DROP_UNUSABLE;
fd4c7f2f 1851
eaf85ca7
ZY		 1852 skb->dev = dev;
1853 __skb_queue_head_init(&frame_list);
fd4c7f2f 1854
e3cf8b3f
ZY		 1855 if (skb_linearize(skb))
1856 return RX_DROP_UNUSABLE;
1857
eaf85ca7
ZY		 1858 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1859 rx->sdata->vif.type,
8b3becad 1860 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1861
eaf85ca7
ZY		 1862 while (!skb_queue_empty(&frame_list)) {
1863 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1864
358c8d9d 1865 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1866 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1867 continue;
1868 }
eaf85ca7
ZY		 1869 dev->stats.rx_packets++;
1870 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1871
1872 ieee80211_deliver_skb(rx);
1873 }
1874
9ae54c84 1875 return RX_QUEUED;
fd4c7f2f
RR		 1876}
1877
bf94e17b 1878#ifdef CONFIG_MAC80211_MESH
b0dee578 1879static ieee80211_rx_result
e32f85f7
LCC		 1880ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1881{
1882 struct ieee80211_hdr *hdr;
1883 struct ieee80211s_hdr *mesh_hdr;
1884 unsigned int hdrlen;
1885 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1886 struct ieee80211_local *local = rx->local;
eb9fb5b8 1887 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1888 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1889
1890 hdr = (struct ieee80211_hdr *) skb->data;
1891 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1892 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1893
2157fdd6
TP		 1894 /* frame is in RMC, don't forward */
1895 if (ieee80211_is_data(hdr->frame_control) &&
1896 is_multicast_ether_addr(hdr->addr1) &&
1897 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1898 return RX_DROP_MONITOR;
1899
e32f85f7
LCC		 1900 if (!ieee80211_is_data(hdr->frame_control))
1901 return RX_CONTINUE;
1902
1903 if (!mesh_hdr->ttl)
1904 /* illegal frame */
1905 return RX_DROP_MONITOR;
1906
cfee66b0
JC		 1907 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1908 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1909 dropped_frames_congestion);
1910 return RX_DROP_MONITOR;
1911 }
1912
43b7b314 1913 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1914 struct mesh_path *mppath;
43b7b314
JC		 1915 char *proxied_addr;
1916 char *mpp_addr;
1917
1918 if (is_multicast_ether_addr(hdr->addr1)) {
1919 mpp_addr = hdr->addr3;
1920 proxied_addr = mesh_hdr->eaddr1;
1921 } else {
1922 mpp_addr = hdr->addr4;
1923 proxied_addr = mesh_hdr->eaddr2;
1924 }
79617dee 1925
79617dee 1926 rcu_read_lock();
43b7b314 1927 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1928 if (!mppath) {
43b7b314 1929 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1930 } else {
1931 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1932 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1933 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1934 spin_unlock_bh(&mppath->state_lock);
1935 }
1936 rcu_read_unlock();
1937 }
1938
3c5772a5
JC		 1939 /* Frame has reached destination. Don't forward */
1940 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1941 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1942 return RX_CONTINUE;
1943
d0ce1855 1944 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb));
e32f85f7
LCC		 1945 mesh_hdr->ttl--;
1946
554891e6 1947 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1948 if (!mesh_hdr->ttl)
472dbc45 1949 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1950 dropped_frames_ttl);
1951 else {
1952 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1953 struct ieee80211_tx_info *info;
1954
e32f85f7
LCC		 1955 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1956
1957 if (!fwd_skb && net_ratelimit())
1958 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1959 sdata->name);
919bbad5 1960 if (!fwd_skb)
b51aff05 1961 goto out;
e32f85f7
LCC		 1962
1963 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1964 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1965 info = IEEE80211_SKB_CB(fwd_skb);
1966 memset(info, 0, sizeof(*info));
1967 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1968 info->control.vif = &rx->sdata->vif;
d0ce1855 1969 info->control.jiffies = jiffies;
4777be41 1970 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
c8a61a7d
DW		 1971 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1972 fwded_mcast);
4777be41 1973 } else {
3c5772a5
JC		 1974 int err;
1975 /*
1976 * Save TA to addr1 to send TA a path error if a
1977 * suitable next hop is not found
1978 */
1979 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1980 ETH_ALEN);
3c5772a5 1981 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1982 /* Failed to immediately resolve next hop:
1983 * fwded frame was dropped or will be added
1984 * later to the pending skb queue. */
1985 if (err)
1986 return RX_DROP_MONITOR;
c8a61a7d
DW		 1987
1988 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1989 fwded_unicast);
249b405c
JC		 1990 }
1991 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1992 fwded_frames);
3b8d81e0 1993 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1994 }
1995 }
1996
b51aff05 1997 out:
3c5772a5 1998 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1999 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2000 return RX_CONTINUE;
2001 else
2002 return RX_DROP_MONITOR;
2003}
bf94e17b 2004#endif
e32f85f7 2005
49461622 2006static ieee80211_rx_result debug_noinline
5cf121c3 2007ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2008{
eb9fb5b8 2009 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2010 struct ieee80211_local *local = rx->local;
eb9fb5b8 2011 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2012 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2013 __le16 fc = hdr->frame_control;
4114fa21 2014 bool port_control;
ce3edf6d 2015 int err;
76ee65bf 2016
358c8d9d 2017 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2018 return RX_CONTINUE;
76ee65bf 2019
358c8d9d 2020 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2021 return RX_DROP_MONITOR;
76ee65bf 2022
f14543ee
FF		 2023 /*
2024 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2025 * that a 4-addr station can be detected and moved into a separate VLAN
2026 */
2027 if (ieee80211_has_a4(hdr->frame_control) &&
2028 sdata->vif.type == NL80211_IFTYPE_AP)
2029 return RX_DROP_MONITOR;
2030
4114fa21 2031 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2032 if (unlikely(err))
e4c26add 2033 return RX_DROP_UNUSABLE;
76ee65bf 2034
358c8d9d 2035 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2036 return RX_DROP_MONITOR;
ce3edf6d 2037
4114fa21
FF		 2038 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2039 unlikely(port_control) && sdata->bss) {
2040 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2041 u.ap);
2042 dev = sdata->dev;
2043 rx->sdata = sdata;
2044 }
2045
76ee65bf
RR		 2046 rx->skb->dev = dev;
2047
2048 dev->stats.rx_packets++;
2049 dev->stats.rx_bytes += rx->skb->len;
2050
08ca944e 2051 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2052 !is_multicast_ether_addr(
2053 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2054 (!local->scanning &&
2055 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2056 mod_timer(&local->dynamic_ps_timer, jiffies +
2057 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2058 }
2059
76ee65bf 2060 ieee80211_deliver_skb(rx);
571ecf67 2061
9ae54c84 2062 return RX_QUEUED;
571ecf67
JB		 2063}
2064
49461622 2065static ieee80211_rx_result debug_noinline
24a8fdad 2066ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2067{
2068 struct ieee80211_local *local = rx->local;
2069 struct ieee80211_hw *hw = &local->hw;
2070 struct sk_buff *skb = rx->skb;
a7767f95 2071 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2072 struct tid_ampdu_rx *tid_agg_rx;
2073 u16 start_seq_num;
2074 u16 tid;
2075
a7767f95 2076 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2077 return RX_CONTINUE;
71364716 2078
a7767f95 2079 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2080 struct {
2081 __le16 control, start_seq_num;
2082 } __packed bar_data;
2083
71364716 2084 if (!rx->sta)
a02ae758 2085 return RX_DROP_MONITOR;
8ae5977f
JB		 2086
2087 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2088 &bar_data, sizeof(bar_data)))
2089 return RX_DROP_MONITOR;
2090
8ae5977f 2091 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2092
2093 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2094 if (!tid_agg_rx)
a02ae758 2095 return RX_DROP_MONITOR;
71364716 2096
8ae5977f 2097 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2098
2099 /* reset session timer */
20ad19d0
JB		 2100 if (tid_agg_rx->timeout)
2101 mod_timer(&tid_agg_rx->session_timer,
2102 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2103
dd318575 2104 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2105 /* release stored frames up to start of BAR */
24a8fdad 2106 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2107 spin_unlock(&tid_agg_rx->reorder_lock);
2108
a02ae758
JB		 2109 kfree_skb(skb);
2110 return RX_QUEUED;
71364716
RR		 2111 }
2112
08daecae
JB		 2113 /*
2114 * After this point, we only want management frames,
2115 * so we can drop all remaining control frames to
2116 * cooked monitor interfaces.
2117 */
2118 return RX_DROP_MONITOR;
71364716
RR		 2119}
2120
f4f727a6
JM		 2121static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2122 struct ieee80211_mgmt *mgmt,
2123 size_t len)
fea14732
JM		 2124{
2125 struct ieee80211_local *local = sdata->local;
2126 struct sk_buff *skb;
2127 struct ieee80211_mgmt *resp;
2128
47846c9b 2129 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2130 /* Not to own unicast address */
2131 return;
2132 }
2133
46900298
JB		 2134 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2135 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2136 /* Not from the current AP or not associated yet. */
fea14732
JM		 2137 return;
2138 }
2139
2140 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2141 /* Too short SA Query request frame */
2142 return;
2143 }
2144
2145 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2146 if (skb == NULL)
2147 return;
2148
2149 skb_reserve(skb, local->hw.extra_tx_headroom);
2150 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2151 memset(resp, 0, 24);
2152 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2153 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2154 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2155 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2156 IEEE80211_STYPE_ACTION);
2157 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2158 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2159 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2160 memcpy(resp->u.action.u.sa_query.trans_id,
2161 mgmt->u.action.u.sa_query.trans_id,
2162 WLAN_SA_QUERY_TR_ID_LEN);
2163
62ae67be 2164 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2165}
2166
2e161f78
JB		 2167static ieee80211_rx_result debug_noinline
2168ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2169{
2170 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2171 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2172
2173 /*
2174 * From here on, look only at management frames.
2175 * Data and control frames are already handled,
2176 * and unknown (reserved) frames are useless.
2177 */
2178 if (rx->skb->len < 24)
2179 return RX_DROP_MONITOR;
2180
2181 if (!ieee80211_is_mgmt(mgmt->frame_control))
2182 return RX_DROP_MONITOR;
2183
554891e6 2184 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2185 return RX_DROP_MONITOR;
2186
2187 if (ieee80211_drop_unencrypted_mgmt(rx))
2188 return RX_DROP_UNUSABLE;
2189
2190 return RX_CONTINUE;
2191}
2192
de1ede7a
JB		 2193static ieee80211_rx_result debug_noinline
2194ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2195{
2196 struct ieee80211_local *local = rx->local;
eb9fb5b8 2197 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2198 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2199 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2200 int len = rx->skb->len;
2201
2202 if (!ieee80211_is_action(mgmt->frame_control))
2203 return RX_CONTINUE;
2204
026331c4
JM		 2205 /* drop too small frames */
2206 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2207 return RX_DROP_UNUSABLE;
de1ede7a 2208
026331c4 2209 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2210 return RX_DROP_UNUSABLE;
de1ede7a 2211
554891e6 2212 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2213 return RX_DROP_UNUSABLE;
97ebe12a 2214
de1ede7a
JB		 2215 switch (mgmt->u.action.category) {
2216 case WLAN_CATEGORY_BACK:
8abd3f9b 2217 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2218 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b
JB		 2219 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2220 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2221 break;
8abd3f9b 2222
026331c4
JM		 2223 /* verify action_code is present */
2224 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2225 break;
2226
de1ede7a
JB		 2227 switch (mgmt->u.action.u.addba_req.action_code) {
2228 case WLAN_ACTION_ADDBA_REQ:
2229 if (len < (IEEE80211_MIN_ACTION_SIZE +
2230 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2231 goto invalid;
2232 break;
de1ede7a
JB		 2233 case WLAN_ACTION_ADDBA_RESP:
2234 if (len < (IEEE80211_MIN_ACTION_SIZE +
2235 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2236 goto invalid;
2237 break;
de1ede7a
JB		 2238 case WLAN_ACTION_DELBA:
2239 if (len < (IEEE80211_MIN_ACTION_SIZE +
2240 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2241 goto invalid;
2242 break;
2243 default:
2244 goto invalid;
de1ede7a 2245 }
bed7ee6e 2246
8b58ff83 2247 goto queue;
39192c0b
JB		 2248 case WLAN_CATEGORY_SPECTRUM_MGMT:
2249 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2250 break;
46900298
JB		 2251
2252 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2253 break;
46900298 2254
026331c4
JM		 2255 /* verify action_code is present */
2256 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2257 break;
2258
39192c0b
JB		 2259 switch (mgmt->u.action.u.measurement.action_code) {
2260 case WLAN_ACTION_SPCT_MSR_REQ:
2261 if (len < (IEEE80211_MIN_ACTION_SIZE +
2262 sizeof(mgmt->u.action.u.measurement)))
84040805 2263 break;
39192c0b 2264 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2265 goto handled;
c481ec97
S		 2266 case WLAN_ACTION_SPCT_CHL_SWITCH:
2267 if (len < (IEEE80211_MIN_ACTION_SIZE +
2268 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2269 break;
c481ec97 2270
cc32abd4 2271 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2272 break;
cc32abd4 2273
46900298 2274 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2275 break;
c481ec97 2276
8b58ff83 2277 goto queue;
39192c0b
JB		 2278 }
2279 break;
fea14732
JM		 2280 case WLAN_CATEGORY_SA_QUERY:
2281 if (len < (IEEE80211_MIN_ACTION_SIZE +
2282 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2283 break;
2284
fea14732
JM		 2285 switch (mgmt->u.action.u.sa_query.action) {
2286 case WLAN_ACTION_SA_QUERY_REQUEST:
2287 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2288 break;
fea14732 2289 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2290 goto handled;
fea14732
JM		 2291 }
2292 break;
8db09850
TP		 2293 case WLAN_CATEGORY_SELF_PROTECTED:
2294 switch (mgmt->u.action.u.self_prot.action_code) {
2295 case WLAN_SP_MESH_PEERING_OPEN:
2296 case WLAN_SP_MESH_PEERING_CLOSE:
2297 case WLAN_SP_MESH_PEERING_CONFIRM:
2298 if (!ieee80211_vif_is_mesh(&sdata->vif))
2299 goto invalid;
2300 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2301 /* userspace handles this frame */
2302 break;
2303 goto queue;
2304 case WLAN_SP_MGK_INFORM:
2305 case WLAN_SP_MGK_ACK:
2306 if (!ieee80211_vif_is_mesh(&sdata->vif))
2307 goto invalid;
2308 break;
2309 }
2310 break;
d3aaec8a 2311 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2312 if (!ieee80211_vif_is_mesh(&sdata->vif))
2313 break;
25d49e4d
TP		 2314 if (mesh_action_is_path_sel(mgmt) &&
2315 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2316 break;
2317 goto queue;
84040805 2318 }
026331c4 2319
2e161f78
JB		 2320 return RX_CONTINUE;
2321
bed7ee6e 2322 invalid:
554891e6 2323 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2324 /* will return in the next handlers */
2325 return RX_CONTINUE;
2326
2327 handled:
2328 if (rx->sta)
2329 rx->sta->rx_packets++;
2330 dev_kfree_skb(rx->skb);
2331 return RX_QUEUED;
2332
2333 queue:
2334 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2335 skb_queue_tail(&sdata->skb_queue, rx->skb);
2336 ieee80211_queue_work(&local->hw, &sdata->work);
2337 if (rx->sta)
2338 rx->sta->rx_packets++;
2339 return RX_QUEUED;
2340}
2341
2342static ieee80211_rx_result debug_noinline
2343ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2344{
554891e6 2345 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2346
2347 /* skip known-bad action frames and return them in the next handler */
554891e6 2348 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2349 return RX_CONTINUE;
d7907448 2350
026331c4
JM		 2351 /*
2352 * Getting here means the kernel doesn't know how to handle
2353 * it, but maybe userspace does ... include returned frames
2354 * so userspace can register for those to know whether ones
2355 * it transmitted were processed or returned.
2356 */
026331c4 2357
2e161f78
JB		 2358 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2359 rx->skb->data, rx->skb->len,
2360 GFP_ATOMIC)) {
2361 if (rx->sta)
2362 rx->sta->rx_packets++;
2363 dev_kfree_skb(rx->skb);
2364 return RX_QUEUED;
2365 }
2366
2367
2368 return RX_CONTINUE;
2369}
2370
2371static ieee80211_rx_result debug_noinline
2372ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2373{
2374 struct ieee80211_local *local = rx->local;
2375 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2376 struct sk_buff *nskb;
2377 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2379
2380 if (!ieee80211_is_action(mgmt->frame_control))
2381 return RX_CONTINUE;
2382
2383 /*
2384 * For AP mode, hostapd is responsible for handling any action
2385 * frames that we didn't handle, including returning unknown
2386 * ones. For all other modes we will return them to the sender,
2387 * setting the 0x80 bit in the action category, as required by
2388 * 802.11-2007 7.3.1.11.
2389 * Newer versions of hostapd shall also use the management frame
2390 * registration mechanisms, but older ones still use cooked
2391 * monitor interfaces so push all frames there.
2392 */
554891e6 2393 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2394 (sdata->vif.type == NL80211_IFTYPE_AP ||
2395 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2396 return RX_DROP_MONITOR;
026331c4 2397
84040805
JB		 2398 /* do not return rejected action frames */
2399 if (mgmt->u.action.category & 0x80)
2400 return RX_DROP_UNUSABLE;
2401
2402 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2403 GFP_ATOMIC);
2404 if (nskb) {
292b4df6 2405 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2406
292b4df6
JL		 2407 nmgmt->u.action.category |= 0x80;
2408 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2409 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2410
2411 memset(nskb->cb, 0, sizeof(nskb->cb));
2412
2413 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2414 }
39192c0b
JB		 2415 dev_kfree_skb(rx->skb);
2416 return RX_QUEUED;
de1ede7a
JB		 2417}
2418
49461622 2419static ieee80211_rx_result debug_noinline
5cf121c3 2420ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2421{
eb9fb5b8 2422 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2423 ieee80211_rx_result rxs;
77a121c3
JB		 2424 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2425 __le16 stype;
571ecf67 2426
af6b6374
JB		 2427 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2428 if (rxs != RX_CONTINUE)
2429 return rxs;
2430
77a121c3 2431 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2432
77a121c3
JB		 2433 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2434 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2435 sdata->vif.type != NL80211_IFTYPE_STATION)
2436 return RX_DROP_MONITOR;
472dbc45 2437
77a121c3
JB		 2438 switch (stype) {
2439 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2440 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2441 /* process for all: mesh, mlme, ibss */
2442 break;
2443 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2444 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2445 if (is_multicast_ether_addr(mgmt->da) &&
2446 !is_broadcast_ether_addr(mgmt->da))
2447 return RX_DROP_MONITOR;
2448
77a121c3
JB		 2449 /* process only for station */
2450 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2451 return RX_DROP_MONITOR;
2452 break;
2453 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2454 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2455 /* process only for ibss */
2456 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2457 return RX_DROP_MONITOR;
2458 break;
2459 default:
2460 return RX_DROP_MONITOR;
2461 }
f9d540ee 2462
77a121c3 2463 /* queue up frame and kick off work to process it */
c1475ca9 2464 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2465 skb_queue_tail(&sdata->skb_queue, rx->skb);
2466 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2467 if (rx->sta)
2468 rx->sta->rx_packets++;
46900298 2469
77a121c3 2470 return RX_QUEUED;
571ecf67
JB		 2471}
2472
5cf121c3 2473/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2474static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2475 struct ieee80211_rate *rate)
3d30d949
MW		 2476{
2477 struct ieee80211_sub_if_data *sdata;
2478 struct ieee80211_local *local = rx->local;
2479 struct ieee80211_rtap_hdr {
2480 struct ieee80211_radiotap_header hdr;
2481 u8 flags;
5f0b7de5 2482 u8 rate_or_pad;
3d30d949
MW		 2483 __le16 chan_freq;
2484 __le16 chan_flags;
bc10502d 2485 } __packed *rthdr;
3d30d949
MW		 2486 struct sk_buff *skb = rx->skb, *skb2;
2487 struct net_device *prev_dev = NULL;
eb9fb5b8 2488 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2489
554891e6
JB		 2490 /*
2491 * If cooked monitor has been processed already, then
2492 * don't do it again. If not, set the flag.
2493 */
2494 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2495 goto out_free_skb;
554891e6 2496 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2497
152c477a
JB		 2498 /* If there are no cooked monitor interfaces, just free the SKB */
2499 if (!local->cooked_mntrs)
2500 goto out_free_skb;
2501
3d30d949
MW		 2502 if (skb_headroom(skb) < sizeof(*rthdr) &&
2503 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2504 goto out_free_skb;
2505
2506 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2507 memset(rthdr, 0, sizeof(*rthdr));
2508 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2509 rthdr->hdr.it_present =
2510 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2511 (1 << IEEE80211_RADIOTAP_CHANNEL));
2512
5f0b7de5
JB		 2513 if (rate) {
2514 rthdr->rate_or_pad = rate->bitrate / 5;
2515 rthdr->hdr.it_present |=
2516 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2517 }
3d30d949
MW		 2518 rthdr->chan_freq = cpu_to_le16(status->freq);
2519
2520 if (status->band == IEEE80211_BAND_5GHZ)
2521 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2522 IEEE80211_CHAN_5GHZ);
2523 else
2524 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2525 IEEE80211_CHAN_2GHZ);
2526
2527 skb_set_mac_header(skb, 0);
2528 skb->ip_summed = CHECKSUM_UNNECESSARY;
2529 skb->pkt_type = PACKET_OTHERHOST;
2530 skb->protocol = htons(ETH_P_802_2);
2531
2532 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2533 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2534 continue;
2535
05c914fe 2536 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2537 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2538 continue;
2539
2540 if (prev_dev) {
2541 skb2 = skb_clone(skb, GFP_ATOMIC);
2542 if (skb2) {
2543 skb2->dev = prev_dev;
5548a8a1 2544 netif_receive_skb(skb2);
3d30d949
MW		 2545 }
2546 }
2547
2548 prev_dev = sdata->dev;
2549 sdata->dev->stats.rx_packets++;
2550 sdata->dev->stats.rx_bytes += skb->len;
2551 }
2552
2553 if (prev_dev) {
2554 skb->dev = prev_dev;
5548a8a1 2555 netif_receive_skb(skb);
554891e6
JB		 2556 return;
2557 }
3d30d949
MW		 2558
2559 out_free_skb:
2560 dev_kfree_skb(skb);
2561}
2562
aa0c8636
CL		 2563static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2564 ieee80211_rx_result res)
2565{
2566 switch (res) {
2567 case RX_DROP_MONITOR:
2568 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2569 if (rx->sta)
2570 rx->sta->rx_dropped++;
2571 /* fall through */
2572 case RX_CONTINUE: {
2573 struct ieee80211_rate *rate = NULL;
2574 struct ieee80211_supported_band *sband;
2575 struct ieee80211_rx_status *status;
2576
2577 status = IEEE80211_SKB_RXCB((rx->skb));
2578
2579 sband = rx->local->hw.wiphy->bands[status->band];
2580 if (!(status->flag & RX_FLAG_HT))
2581 rate = &sband->bitrates[status->rate_idx];
2582
2583 ieee80211_rx_cooked_monitor(rx, rate);
2584 break;
2585 }
2586 case RX_DROP_UNUSABLE:
2587 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2588 if (rx->sta)
2589 rx->sta->rx_dropped++;
2590 dev_kfree_skb(rx->skb);
2591 break;
2592 case RX_QUEUED:
2593 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2594 break;
2595 }
2596}
571ecf67 2597
24a8fdad 2598static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2599{
58905290 2600 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2601 struct sk_buff *skb;
8944b79f 2602
e32f85f7
LCC		 2603#define CALL_RXH(rxh) \
2604 do { \
2605 res = rxh(rx); \
2606 if (res != RX_CONTINUE) \
2569a826 2607 goto rxh_next; \
e32f85f7 2608 } while (0);
49461622 2609
24a8fdad
CL		 2610 spin_lock(&rx->local->rx_skb_queue.lock);
2611 if (rx->local->running_rx_handler)
2612 goto unlock;
2613
2614 rx->local->running_rx_handler = true;
2615
2616 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2617 spin_unlock(&rx->local->rx_skb_queue.lock);
2618
2569a826
JB		 2619 /*
2620 * all the other fields are valid across frames
2621 * that belong to an aMPDU since they are on the
2622 * same TID from the same station
2623 */
2624 rx->skb = skb;
2625
2626 CALL_RXH(ieee80211_rx_h_decrypt)
2627 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2628 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2629 CALL_RXH(ieee80211_rx_h_sta_process)
2630 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2631 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2632 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2633#ifdef CONFIG_MAC80211_MESH
aa0c8636 2634 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2635 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2636#endif
2154c81c
JC		 2637 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2638 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2639 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2640 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2641 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2642 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2643 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2644 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2645 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2646
aa0c8636
CL		 2647 rxh_next:
2648 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2649 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2650#undef CALL_RXH
aa0c8636 2651 }
24a8fdad
CL		 2652
2653 rx->local->running_rx_handler = false;
2654
2655 unlock:
2656 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2657}
2658
4406c376 2659static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2660{
aa0c8636
CL		 2661 ieee80211_rx_result res = RX_DROP_MONITOR;
2662
aa0c8636
CL		 2663#define CALL_RXH(rxh) \
2664 do { \
2665 res = rxh(rx); \
2666 if (res != RX_CONTINUE) \
2667 goto rxh_next; \
2668 } while (0);
2669
2670 CALL_RXH(ieee80211_rx_h_passive_scan)
2671 CALL_RXH(ieee80211_rx_h_check)
2672
24a8fdad 2673 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2674
24a8fdad 2675 ieee80211_rx_handlers(rx);
aa0c8636 2676 return;
49461622 2677
2569a826 2678 rxh_next:
aa0c8636
CL		 2679 ieee80211_rx_handlers_result(rx, res);
2680
2681#undef CALL_RXH
58905290
JB		 2682}
2683
2bff8ebf 2684/*
dd318575
JB		 2685 * This function makes calls into the RX path, therefore
2686 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2687 */
2688void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2689{
554891e6
JB		 2690 struct ieee80211_rx_data rx = {
2691 .sta = sta,
2692 .sdata = sta->sdata,
2693 .local = sta->local,
9e26297a
JB		 2694 /* This is OK -- must be QoS data frame */
2695 .security_idx = tid,
2696 .seqno_idx = tid,
fcf8bd3b 2697 .flags = 0,
554891e6 2698 };
2c15a0cf
CL		 2699 struct tid_ampdu_rx *tid_agg_rx;
2700
2701 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2702 if (!tid_agg_rx)
2703 return;
2bff8ebf 2704
2c15a0cf 2705 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2706 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2707 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2708
24a8fdad 2709 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2710}
2711
571ecf67
JB		 2712/* main receive path */
2713
20b01f80 2714static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2715 struct ieee80211_hdr *hdr)
2716{
20b01f80 2717 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2718 struct sk_buff *skb = rx->skb;
2719 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2720 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2721 int multicast = is_multicast_ether_addr(hdr->addr1);
2722
51fb61e7 2723 switch (sdata->vif.type) {
05c914fe 2724 case NL80211_IFTYPE_STATION:
9bc383de 2725 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2726 return 0;
77fdaa12 2727 if (!multicast &&
47846c9b 2728 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2729 if (!(sdata->dev->flags & IFF_PROMISC) ||
2730 sdata->u.mgd.use_4addr)
23a24def 2731 return 0;
554891e6 2732 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2733 }
2734 break;
05c914fe 2735 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2736 if (!bssid)
2737 return 0;
a7767f95 2738 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2739 return 1;
87291c02 2740 }
46900298 2741 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2742 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2743 return 0;
554891e6 2744 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2745 } else if (!multicast &&
47846c9b 2746 compare_ether_addr(sdata->vif.addr,
23a24def 2747 hdr->addr1) != 0) {
4150c572 2748 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2749 return 0;
554891e6 2750 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2751 } else if (!rx->sta) {
2752 int rate_idx;
eb9fb5b8 2753 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2754 rate_idx = 0; /* TODO: HT rates */
2755 else
eb9fb5b8 2756 rate_idx = status->rate_idx;
34e89507
JB		 2757 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2758 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2759 }
23a24def 2760 break;
05c914fe 2761 case NL80211_IFTYPE_MESH_POINT:
6032f934 2762 if (!multicast &&
47846c9b 2763 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2764 hdr->addr1) != 0) {
2765 if (!(sdata->dev->flags & IFF_PROMISC))
2766 return 0;
2767
554891e6 2768 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2769 }
2770 break;
05c914fe
JB		 2771 case NL80211_IFTYPE_AP_VLAN:
2772 case NL80211_IFTYPE_AP:
23a24def 2773 if (!bssid) {
47846c9b 2774 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2775 hdr->addr1))
2776 return 0;
2777 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2778 sdata->vif.addr)) {
771bbd09 2779 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2780 !ieee80211_is_beacon(hdr->frame_control) &&
2781 !(ieee80211_is_action(hdr->frame_control) &&
2782 sdata->vif.p2p))
23a24def 2783 return 0;
554891e6 2784 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2785 }
23a24def 2786 break;
05c914fe 2787 case NL80211_IFTYPE_WDS:
a7767f95 2788 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2789 return 0;
2790 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2791 return 0;
2792 break;
2ca27bcf 2793 default:
fb1c1cd6
JB		 2794 /* should never get here */
2795 WARN_ON(1);
2796 break;
23a24def
JB		 2797 }
2798
2799 return 1;
2800}
2801
4406c376
JB		 2802/*
2803 * This function returns whether or not the SKB
2804 * was destined for RX processing or not, which,
2805 * if consume is true, is equivalent to whether
2806 * or not the skb was consumed.
2807 */
2808static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2809 struct sk_buff *skb, bool consume)
2810{
2811 struct ieee80211_local *local = rx->local;
2812 struct ieee80211_sub_if_data *sdata = rx->sdata;
2813 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2814 struct ieee80211_hdr *hdr = (void *)skb->data;
2815 int prepares;
2816
2817 rx->skb = skb;
554891e6 2818 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2819 prepares = prepare_for_handlers(rx, hdr);
2820
2821 if (!prepares)
2822 return false;
2823
4406c376
JB		 2824 if (!consume) {
2825 skb = skb_copy(skb, GFP_ATOMIC);
2826 if (!skb) {
2827 if (net_ratelimit())
2828 wiphy_debug(local->hw.wiphy,
b305dae4 2829 "failed to copy skb for %s\n",
4406c376
JB		 2830 sdata->name);
2831 return true;
2832 }
2833
2834 rx->skb = skb;
2835 }
2836
2837 ieee80211_invoke_rx_handlers(rx);
2838 return true;
2839}
2840
571ecf67 2841/*
6368e4b1
RR		 2842 * This is the actual Rx frames handler. as it blongs to Rx path it must
2843 * be called with rcu_read_lock protection.
571ecf67 2844 */
71ebb4aa 2845static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2846 struct sk_buff *skb)
571ecf67 2847{
554891e6 2848 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2849 struct ieee80211_local *local = hw_to_local(hw);
2850 struct ieee80211_sub_if_data *sdata;
571ecf67 2851 struct ieee80211_hdr *hdr;
e3cf8b3f 2852 __le16 fc;
5cf121c3 2853 struct ieee80211_rx_data rx;
4406c376 2854 struct ieee80211_sub_if_data *prev;
56af3268 2855 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2856 int err = 0;
571ecf67 2857
e3cf8b3f 2858 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2859 memset(&rx, 0, sizeof(rx));
2860 rx.skb = skb;
2861 rx.local = local;
72abd81b 2862
e3cf8b3f 2863 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2864 local->dot11ReceivedFragmentCount++;
571ecf67 2865
142b9f50 2866 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2867 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2868 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2869
e3cf8b3f
ZY		 2870 if (ieee80211_is_mgmt(fc))
2871 err = skb_linearize(skb);
2872 else
2873 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2874
2875 if (err) {
2876 dev_kfree_skb(skb);
2877 return;
2878 }
2879
2880 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2881 ieee80211_parse_qos(&rx);
d1c3a37c 2882 ieee80211_verify_alignment(&rx);
38f3714d 2883
e3cf8b3f 2884 if (ieee80211_is_data(fc)) {
56af3268 2885 prev_sta = NULL;
4406c376 2886
2a33bee2 2887 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2888 if (!prev_sta) {
2889 prev_sta = sta;
2890 continue;
2891 }
2892
2893 rx.sta = prev_sta;
2894 rx.sdata = prev_sta->sdata;
4406c376 2895 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2896
56af3268 2897 prev_sta = sta;
4406c376 2898 }
56af3268
BG		 2899
2900 if (prev_sta) {
2901 rx.sta = prev_sta;
2902 rx.sdata = prev_sta->sdata;
2903
4406c376 2904 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2905 return;
8e26d5ad 2906 goto out;
56af3268 2907 }
4406c376
JB		 2908 }
2909
4b0dd98e 2910 prev = NULL;
b2e7771e 2911
4b0dd98e
JB		 2912 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2913 if (!ieee80211_sdata_running(sdata))
2914 continue;
340e11f3 2915
4b0dd98e
JB		 2916 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2917 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2918 continue;
340e11f3 2919
4b0dd98e
JB		 2920 /*
2921 * frame is destined for this interface, but if it's
2922 * not also for the previous one we handle that after
2923 * the loop to avoid copying the SKB once too much
2924 */
4bb29f8c 2925
4b0dd98e 2926 if (!prev) {
abe60632 2927 prev = sdata;
4b0dd98e 2928 continue;
340e11f3 2929 }
4bb29f8c 2930
2a33bee2 2931 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2932 rx.sdata = prev;
2933 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2934
4b0dd98e
JB		 2935 prev = sdata;
2936 }
2937
2938 if (prev) {
2a33bee2 2939 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2940 rx.sdata = prev;
4406c376 2941
4b0dd98e
JB		 2942 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2943 return;
571ecf67 2944 }
4406c376 2945
8e26d5ad 2946 out:
4406c376 2947 dev_kfree_skb(skb);
571ecf67 2948}
6368e4b1
RR		 2949
2950/*
2951 * This is the receive path handler. It is called by a low level driver when an
2952 * 802.11 MPDU is received from the hardware.
2953 */
103bf9f7 2954void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2955{
2956 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2957 struct ieee80211_rate *rate = NULL;
2958 struct ieee80211_supported_band *sband;
f1d58c25 2959 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2960
d20ef63d
JB		 2961 WARN_ON_ONCE(softirq_count() == 0);
2962
77a980dc
JB		 2963 if (WARN_ON(status->band < 0 ||
2964 status->band >= IEEE80211_NUM_BANDS))
2965 goto drop;
8318d78a
JB		 2966
2967 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2968 if (WARN_ON(!sband))
2969 goto drop;
8318d78a 2970
89c3a8ac
JB		 2971 /*
2972 * If we're suspending, it is possible although not too likely
2973 * that we'd be receiving frames after having already partially
2974 * quiesced the stack. We can't process such frames then since
2975 * that might, for example, cause stations to be added or other
2976 * driver callbacks be invoked.
2977 */
77a980dc
JB		 2978 if (unlikely(local->quiescing || local->suspended))
2979 goto drop;
89c3a8ac 2980
ea77f12f
JB		 2981 /*
2982 * The same happens when we're not even started,
2983 * but that's worth a warning.
2984 */
77a980dc
JB		 2985 if (WARN_ON(!local->started))
2986 goto drop;
ea77f12f 2987
fc885189 2988 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2989 /*
fc885189
JB		 2990 * Validate the rate, unless a PLCP error means that
2991 * we probably can't have a valid rate here anyway.
e5d6eb83 2992 */
fc885189
JB		 2993
2994 if (status->flag & RX_FLAG_HT) {
2995 /*
2996 * rate_idx is MCS index, which can be [0-76]
2997 * as documented on:
2998 *
2999 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3000 *
3001 * Anything else would be some sort of driver or
3002 * hardware error. The driver should catch hardware
3003 * errors.
3004 */
3005 if (WARN((status->rate_idx < 0 ||
3006 status->rate_idx > 76),
3007 "Rate marked as an HT rate but passed "
3008 "status->rate_idx is not "
3009 "an MCS index [0-76]: %d (0x%02x)\n",
3010 status->rate_idx,
3011 status->rate_idx))
3012 goto drop;
3013 } else {
3014 if (WARN_ON(status->rate_idx < 0 ||
3015 status->rate_idx >= sband->n_bitrates))
3016 goto drop;
3017 rate = &sband->bitrates[status->rate_idx];
3018 }
0fb8ca45 3019 }
6368e4b1 3020
554891e6
JB		 3021 status->rx_flags = 0;
3022
6368e4b1
RR		 3023 /*
3024 * key references and virtual interfaces are protected using RCU
3025 * and this requires that we are in a read-side RCU section during
3026 * receive processing
3027 */
3028 rcu_read_lock();
3029
3030 /*
3031 * Frames with failed FCS/PLCP checksum are not returned,
3032 * all other frames are returned without radiotap header
3033 * if it was previously present.
3034 * Also, frames with less than 16 bytes are dropped.
3035 */
f1d58c25 3036 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3037 if (!skb) {
3038 rcu_read_unlock();
3039 return;
3040 }
3041
e1e54068
JB		 3042 ieee80211_tpt_led_trig_rx(local,
3043 ((struct ieee80211_hdr *)skb->data)->frame_control,
3044 skb->len);
071d9ac2 3045 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3046
3047 rcu_read_unlock();
77a980dc
JB		 3048
3049 return;
3050 drop:
3051 kfree_skb(skb);
6368e4b1 3052}
103bf9f7 3053EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3054
3055/* This is a version of the rx handler that can be called from hard irq
3056 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3057void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3058{
3059 struct ieee80211_local *local = hw_to_local(hw);
3060
3061 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3062
571ecf67
JB		 3063 skb->pkt_type = IEEE80211_RX_MSG;
3064 skb_queue_tail(&local->skb_queue, skb);
3065 tasklet_schedule(&local->tasklet);
3066}
3067EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)