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net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
22
23#include "ieee80211_i.h"
24487981 24#include "driver-ops.h"
2c8dccc7 25#include "led.h"
33b64eb2 26#include "mesh.h"
571ecf67
JB		 27#include "wep.h"
28#include "wpa.h"
29#include "tkip.h"
30#include "wme.h"
31
b2e7771e
JB		 32/*
33 * monitor mode reception
34 *
35 * This function cleans up the SKB, i.e. it removes all the stuff
36 * only useful for monitoring.
37 */
38static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 39 struct sk_buff *skb)
b2e7771e 40{
b2e7771e
JB		 41 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
42 if (likely(skb->len > FCS_LEN))
e3cf8b3f 43 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 44 else {
45 /* driver bug */
46 WARN_ON(1);
47 dev_kfree_skb(skb);
48 skb = NULL;
49 }
50 }
51
52 return skb;
53}
54
f1d58c25 55static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 56 int present_fcs_len)
b2e7771e 57{
f1d58c25 58 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 59 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 60
61 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
62 return 1;
0869aea0 63 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 64 return 1;
87228f57
HH		 65 if (ieee80211_is_ctl(hdr->frame_control) &&
66 !ieee80211_is_pspoll(hdr->frame_control) &&
67 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 68 return 1;
69 return 0;
70}
71
601ae7f2
BR		 72static int
73ieee80211_rx_radiotap_len(struct ieee80211_local *local,
74 struct ieee80211_rx_status *status)
75{
76 int len;
77
78 /* always present fields */
79 len = sizeof(struct ieee80211_radiotap_header) + 9;
80
6ebacbb7 81 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 82 len += 8;
7fee5372 83 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 84 len += 1;
601ae7f2
BR		 85
86 if (len & 1) /* padding for RX_FLAGS if necessary */
87 len++;
88
6d744bac
JB		 89 if (status->flag & RX_FLAG_HT) /* HT info */
90 len += 3;
91
601ae7f2
BR		 92 return len;
93}
94
d1c3a37c 95/*
601ae7f2
BR		 96 * ieee80211_add_rx_radiotap_header - add radiotap header
97 *
98 * add a radiotap header containing all the fields which the hardware provided.
99 */
100static void
101ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
102 struct sk_buff *skb,
601ae7f2
BR		 103 struct ieee80211_rate *rate,
104 int rtap_len)
105{
f1d58c25 106 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 107 struct ieee80211_radiotap_header *rthdr;
108 unsigned char *pos;
6a86b9c7 109 u16 rx_flags = 0;
601ae7f2
BR		 110
111 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
112 memset(rthdr, 0, rtap_len);
113
114 /* radiotap header, set always present flags */
115 rthdr->it_present =
116 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 117 (1 << IEEE80211_RADIOTAP_CHANNEL) |
118 (1 << IEEE80211_RADIOTAP_ANTENNA) |
119 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
120 rthdr->it_len = cpu_to_le16(rtap_len);
121
122 pos = (unsigned char *)(rthdr+1);
123
124 /* the order of the following fields is important */
125
126 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 127 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 128 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 129 rthdr->it_present |=
130 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
131 pos += 8;
132 }
133
134 /* IEEE80211_RADIOTAP_FLAGS */
135 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
136 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 137 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
138 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 139 if (status->flag & RX_FLAG_SHORTPRE)
140 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 141 pos++;
142
143 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 144 if (status->flag & RX_FLAG_HT) {
145 /*
38f37be2 146 * MCS information is a separate field in radiotap,
73b48099
JB		 147 * added below. The byte here is needed as padding
148 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 149 */
150 *pos = 0;
8d6f658e 151 } else {
ebe6c7ba 152 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 153 *pos = rate->bitrate / 5;
8d6f658e 154 }
601ae7f2
BR		 155 pos++;
156
157 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 158 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 159 pos += 2;
160 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 161 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
162 pos);
5f0b7de5
JB		 163 else if (status->flag & RX_FLAG_HT)
164 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
165 pos);
9deb1ae5 166 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 167 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
168 pos);
601ae7f2 169 else
6a86b9c7
JB		 170 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
171 pos);
601ae7f2
BR		 172 pos += 2;
173
174 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
175 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
176 *pos = status->signal;
177 rthdr->it_present |=
178 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
179 pos++;
180 }
181
601ae7f2
BR		 182 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
183
184 /* IEEE80211_RADIOTAP_ANTENNA */
185 *pos = status->antenna;
186 pos++;
187
601ae7f2
BR		 188 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
189
190 /* IEEE80211_RADIOTAP_RX_FLAGS */
191 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 192 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 193 pos++;
aae89831 194 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 195 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
196 put_unaligned_le16(rx_flags, pos);
601ae7f2 197 pos += 2;
6d744bac
JB		 198
199 if (status->flag & RX_FLAG_HT) {
200 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
201 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
202 IEEE80211_RADIOTAP_MCS_HAVE_GI |
203 IEEE80211_RADIOTAP_MCS_HAVE_BW;
204 *pos = 0;
205 if (status->flag & RX_FLAG_SHORT_GI)
206 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
207 if (status->flag & RX_FLAG_40MHZ)
208 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
209 pos++;
210 *pos++ = status->rate_idx;
211 }
601ae7f2
BR		 212}
213
b2e7771e
JB		 214/*
215 * This function copies a received frame to all monitor interfaces and
216 * returns a cleaned-up SKB that no longer includes the FCS nor the
217 * radiotap header the driver might have added.
218 */
219static struct sk_buff *
220ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 221 struct ieee80211_rate *rate)
b2e7771e 222{
f1d58c25 223 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 224 struct ieee80211_sub_if_data *sdata;
b2e7771e 225 int needed_headroom = 0;
b2e7771e
JB		 226 struct sk_buff *skb, *skb2;
227 struct net_device *prev_dev = NULL;
228 int present_fcs_len = 0;
b2e7771e
JB		 229
230 /*
231 * First, we may need to make a copy of the skb because
232 * (1) we need to modify it for radiotap (if not present), and
233 * (2) the other RX handlers will modify the skb we got.
234 *
235 * We don't need to, of course, if we aren't going to return
236 * the SKB because it has a bad FCS/PLCP checksum.
237 */
0869aea0
JB		 238
239 /* room for the radiotap header based on driver features */
240 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 241
242 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
243 present_fcs_len = FCS_LEN;
244
e3cf8b3f
ZY		 245 /* make sure hdr->frame_control is on the linear part */
246 if (!pskb_may_pull(origskb, 2)) {
247 dev_kfree_skb(origskb);
248 return NULL;
249 }
250
b2e7771e 251 if (!local->monitors) {
0869aea0 252 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
0869aea0 257 return remove_monitor_info(local, origskb);
b2e7771e
JB		 258 }
259
0869aea0 260 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 261 /* only need to expand headroom if necessary */
262 skb = origskb;
263 origskb = NULL;
264
265 /*
266 * This shouldn't trigger often because most devices have an
267 * RX header they pull before we get here, and that should
268 * be big enough for our radiotap information. We should
269 * probably export the length to drivers so that we can have
270 * them allocate enough headroom to start with.
271 */
272 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 273 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 274 dev_kfree_skb(skb);
275 return NULL;
276 }
277 } else {
278 /*
279 * Need to make a copy and possibly remove radiotap header
280 * and FCS from the original.
281 */
282 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
283
0869aea0 284 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 285
286 if (!skb)
287 return origskb;
288 }
289
0869aea0
JB		 290 /* prepend radiotap information */
291 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 292
ce3edf6d 293 skb_reset_mac_header(skb);
b2e7771e
JB		 294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 299 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 300 continue;
301
3d30d949
MW		 302 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
303 continue;
304
9607e6b6 305 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 306 continue;
307
b2e7771e
JB		 308 if (prev_dev) {
309 skb2 = skb_clone(skb, GFP_ATOMIC);
310 if (skb2) {
311 skb2->dev = prev_dev;
5548a8a1 312 netif_receive_skb(skb2);
b2e7771e
JB		 313 }
314 }
315
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
319 }
320
321 if (prev_dev) {
322 skb->dev = prev_dev;
5548a8a1 323 netif_receive_skb(skb);
b2e7771e
JB		 324 } else
325 dev_kfree_skb(skb);
326
327 return origskb;
328}
329
330
5cf121c3 331static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 332{
238f74a2 333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 334 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 335 int tid, seqno_idx, security_idx;
6e0d114d
JB		 336
337 /* does the frame have a qos control field? */
238f74a2
HH		 338 if (ieee80211_is_data_qos(hdr->frame_control)) {
339 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 340 /* frame has qos control */
238f74a2 341 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 342 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 343 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 344
345 seqno_idx = tid;
346 security_idx = tid;
6e0d114d 347 } else {
1411f9b5
JB		 348 /*
349 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
350 *
351 * Sequence numbers for management frames, QoS data
352 * frames with a broadcast/multicast address in the
353 * Address 1 field, and all non-QoS data frames sent
354 * by QoS STAs are assigned using an additional single
355 * modulo-4096 counter, [...]
356 *
357 * We also use that counter for non-QoS STAs.
358 */
9e26297a
JB		 359 seqno_idx = NUM_RX_DATA_QUEUES;
360 security_idx = 0;
361 if (ieee80211_is_mgmt(hdr->frame_control))
362 security_idx = NUM_RX_DATA_QUEUES;
363 tid = 0;
6e0d114d 364 }
52865dfd 365
9e26297a
JB		 366 rx->seqno_idx = seqno_idx;
367 rx->security_idx = security_idx;
6e0d114d
JB		 368 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
369 * For now, set skb->priority to 0 for other cases. */
370 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 371}
6e0d114d 372
d1c3a37c
JB		 373/**
374 * DOC: Packet alignment
375 *
376 * Drivers always need to pass packets that are aligned to two-byte boundaries
377 * to the stack.
378 *
379 * Additionally, should, if possible, align the payload data in a way that
380 * guarantees that the contained IP header is aligned to a four-byte
381 * boundary. In the case of regular frames, this simply means aligning the
382 * payload to a four-byte boundary (because either the IP header is directly
383 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 384 * in front of it). If the payload data is not properly aligned and the
385 * architecture doesn't support efficient unaligned operations, mac80211
386 * will align the data.
d1c3a37c
JB		 387 *
388 * With A-MSDU frames, however, the payload data address must yield two modulo
389 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
390 * push the IP header further back to a multiple of four again. Thankfully, the
391 * specs were sane enough this time around to require padding each A-MSDU
392 * subframe to a length that is a multiple of four.
393 *
25985edc 394 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 395 * the payload is not supported, the driver is required to move the 802.11
396 * header to be directly in front of the payload in that case.
397 */
398static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 399{
59d9cb07
KV		 400#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
401 WARN_ONCE((unsigned long)rx->skb->data & 1,
402 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 403#endif
6e0d114d
JB		 404}
405
6368e4b1 406
571ecf67
JB		 407/* rx handlers */
408
49461622 409static ieee80211_rx_result debug_noinline
5cf121c3 410ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 411{
412 struct ieee80211_local *local = rx->local;
554891e6 413 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 414 struct sk_buff *skb = rx->skb;
415
79f460ca
LC		 416 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
417 !local->sched_scanning))
4080c7cd
JB		 418 return RX_CONTINUE;
419
b23b025f 420 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 421 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
422 local->sched_scanning)
f1d58c25 423 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 424
4080c7cd
JB		 425 /* scanning finished during invoking of handlers */
426 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
427 return RX_DROP_UNUSABLE;
571ecf67
JB		 428}
429
3cfcf6ac
JM		 430
431static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
432{
433 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
434
435 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
436 return 0;
437
438 return ieee80211_is_robust_mgmt_frame(hdr);
439}
440
441
442static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
443{
444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
445
446 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
447 return 0;
448
449 return ieee80211_is_robust_mgmt_frame(hdr);
450}
451
452
453/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
454static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
455{
456 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
457 struct ieee80211_mmie *mmie;
458
459 if (skb->len < 24 + sizeof(*mmie) ||
460 !is_multicast_ether_addr(hdr->da))
461 return -1;
462
463 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
464 return -1; /* not a robust management frame */
465
466 mmie = (struct ieee80211_mmie *)
467 (skb->data + skb->len - sizeof(*mmie));
468 if (mmie->element_id != WLAN_EID_MMIE ||
469 mmie->length != sizeof(*mmie) - 2)
470 return -1;
471
472 return le16_to_cpu(mmie->key_id);
473}
474
475
33b64eb2 476static ieee80211_rx_result
5cf121c3 477ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 478{
a7767f95 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 480 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 481
a7767f95 482 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 483 if (is_multicast_ether_addr(hdr->addr1)) {
484 if (ieee80211_has_tods(hdr->frame_control) ||
485 !ieee80211_has_fromds(hdr->frame_control))
486 return RX_DROP_MONITOR;
487 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
488 return RX_DROP_MONITOR;
489 } else {
490 if (!ieee80211_has_a4(hdr->frame_control))
491 return RX_DROP_MONITOR;
492 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
493 return RX_DROP_MONITOR;
494 }
33b64eb2
LCC		 495 }
496
497 /* If there is not an established peer link and this is not a peer link
498 * establisment frame, beacon or probe, drop the frame.
499 */
500
57cf8043 501 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 502 struct ieee80211_mgmt *mgmt;
d6d1a5a7 503
a7767f95 504 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 505 return RX_DROP_MONITOR;
506
a7767f95 507 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 508 u8 category;
33b64eb2 509 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 510 category = mgmt->u.action.category;
511 if (category != WLAN_CATEGORY_MESH_ACTION &&
512 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 513 return RX_DROP_MONITOR;
33b64eb2 514 return RX_CONTINUE;
33b64eb2
LCC		 515 }
516
a7767f95
HH		 517 if (ieee80211_is_probe_req(hdr->frame_control) ||
518 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 519 ieee80211_is_beacon(hdr->frame_control) ||
520 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 521 return RX_CONTINUE;
522
523 return RX_DROP_MONITOR;
524
525 }
526
902acc78
JB		 527 return RX_CONTINUE;
528}
33b64eb2 529
1edfb1af
JB		 530#define SEQ_MODULO 0x1000
531#define SEQ_MASK 0xfff
532
533static inline int seq_less(u16 sq1, u16 sq2)
534{
535 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
536}
537
538static inline u16 seq_inc(u16 sq)
539{
540 return (sq + 1) & SEQ_MASK;
541}
542
543static inline u16 seq_sub(u16 sq1, u16 sq2)
544{
545 return (sq1 - sq2) & SEQ_MASK;
546}
547
548
549static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
550 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 551 int index)
1edfb1af 552{
24a8fdad 553 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 554 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 555 struct ieee80211_rx_status *status;
1edfb1af 556
dd318575
JB		 557 lockdep_assert_held(&tid_agg_rx->reorder_lock);
558
1edfb1af
JB		 559 if (!skb)
560 goto no_frame;
561
071d9ac2 562 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 563 tid_agg_rx->stored_mpdu_num--;
564 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 565 status = IEEE80211_SKB_RXCB(skb);
566 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 567 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 568
569no_frame:
570 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
571}
572
573static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
574 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 575 u16 head_seq_num)
1edfb1af
JB		 576{
577 int index;
578
dd318575
JB		 579 lockdep_assert_held(&tid_agg_rx->reorder_lock);
580
1edfb1af
JB		 581 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
582 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
583 tid_agg_rx->buf_size;
24a8fdad 584 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 585 }
586}
587
588/*
589 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
590 * the skb was added to the buffer longer than this time ago, the earlier
591 * frames that have not yet been received are assumed to be lost and the skb
592 * can be released for processing. This may also release other skb's from the
593 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 594 *
595 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 596 */
597#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
598
aa0c8636 599static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 600 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 601{
2bff8ebf 602 int index, j;
aa0c8636 603
dd318575
JB		 604 lockdep_assert_held(&tid_agg_rx->reorder_lock);
605
aa0c8636
CL		 606 /* release the buffer until next missing frame */
607 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
608 tid_agg_rx->buf_size;
609 if (!tid_agg_rx->reorder_buf[index] &&
610 tid_agg_rx->stored_mpdu_num > 1) {
611 /*
612 * No buffers ready to be released, but check whether any
613 * frames in the reorder buffer have timed out.
614 */
aa0c8636
CL		 615 int skipped = 1;
616 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
617 j = (j + 1) % tid_agg_rx->buf_size) {
618 if (!tid_agg_rx->reorder_buf[j]) {
619 skipped++;
620 continue;
621 }
499fe9a4
DH		 622 if (skipped &&
623 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 624 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 625 goto set_release_timer;
aa0c8636
CL		 626
627#ifdef CONFIG_MAC80211_HT_DEBUG
628 if (net_ratelimit())
0fb9a9ec
JP		 629 wiphy_debug(hw->wiphy,
630 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 631#endif
24a8fdad 632 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 633
634 /*
635 * Increment the head seq# also for the skipped slots.
636 */
637 tid_agg_rx->head_seq_num =
638 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
639 skipped = 0;
640 }
641 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 642 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 643 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
644 tid_agg_rx->buf_size;
645 }
2bff8ebf
CL		 646
647 if (tid_agg_rx->stored_mpdu_num) {
648 j = index = seq_sub(tid_agg_rx->head_seq_num,
649 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
650
651 for (; j != (index - 1) % tid_agg_rx->buf_size;
652 j = (j + 1) % tid_agg_rx->buf_size) {
653 if (tid_agg_rx->reorder_buf[j])
654 break;
655 }
656
657 set_release_timer:
658
659 mod_timer(&tid_agg_rx->reorder_timer,
334df731 660 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 661 HT_RX_REORDER_BUF_TIMEOUT);
662 } else {
663 del_timer(&tid_agg_rx->reorder_timer);
664 }
aa0c8636
CL		 665}
666
1edfb1af
JB		 667/*
668 * As this function belongs to the RX path it must be under
669 * rcu_read_lock protection. It returns false if the frame
670 * can be processed immediately, true if it was consumed.
671 */
672static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
673 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 674 struct sk_buff *skb)
1edfb1af
JB		 675{
676 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
677 u16 sc = le16_to_cpu(hdr->seq_ctrl);
678 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
679 u16 head_seq_num, buf_size;
680 int index;
2bff8ebf 681 bool ret = true;
1edfb1af 682
dd318575
JB		 683 spin_lock(&tid_agg_rx->reorder_lock);
684
1edfb1af
JB		 685 buf_size = tid_agg_rx->buf_size;
686 head_seq_num = tid_agg_rx->head_seq_num;
687
688 /* frame with out of date sequence number */
689 if (seq_less(mpdu_seq_num, head_seq_num)) {
690 dev_kfree_skb(skb);
2bff8ebf 691 goto out;
1edfb1af
JB		 692 }
693
694 /*
695 * If frame the sequence number exceeds our buffering window
696 * size release some previous frames to make room for this one.
697 */
698 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
699 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
700 /* release stored frames up to new head to stack */
24a8fdad 701 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 702 }
703
704 /* Now the new frame is always in the range of the reordering buffer */
705
706 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
707
708 /* check if we already stored this frame */
709 if (tid_agg_rx->reorder_buf[index]) {
710 dev_kfree_skb(skb);
2bff8ebf 711 goto out;
1edfb1af
JB		 712 }
713
714 /*
715 * If the current MPDU is in the right order and nothing else
716 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 717 * If it is first but there's something stored, we may be able
718 * to release frames after this one.
1edfb1af
JB		 719 */
720 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
721 tid_agg_rx->stored_mpdu_num == 0) {
722 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 723 ret = false;
724 goto out;
1edfb1af
JB		 725 }
726
727 /* put the frame in the reordering buffer */
728 tid_agg_rx->reorder_buf[index] = skb;
729 tid_agg_rx->reorder_time[index] = jiffies;
730 tid_agg_rx->stored_mpdu_num++;
24a8fdad 731 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 732
2bff8ebf
CL		 733 out:
734 spin_unlock(&tid_agg_rx->reorder_lock);
735 return ret;
1edfb1af
JB		 736}
737
738/*
739 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
740 * true if the MPDU was buffered, false if it should be processed.
741 */
24a8fdad 742static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 743{
2569a826
JB		 744 struct sk_buff *skb = rx->skb;
745 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 746 struct ieee80211_hw *hw = &local->hw;
747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 748 struct sta_info *sta = rx->sta;
1edfb1af
JB		 749 struct tid_ampdu_rx *tid_agg_rx;
750 u16 sc;
751 int tid;
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
JB		 763
764 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
765
a87f736d
JB		 766 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
767 if (!tid_agg_rx)
768 goto dont_reorder;
1edfb1af
JB		 769
770 /* qos null data frames are excluded */
771 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 772 goto dont_reorder;
1edfb1af
JB		 773
774 /* new, potentially un-ordered, ampdu frame - process it */
775
776 /* reset session timer */
777 if (tid_agg_rx->timeout)
778 mod_timer(&tid_agg_rx->session_timer,
779 TU_TO_EXP_TIME(tid_agg_rx->timeout));
780
781 /* if this mpdu is fragmented - terminate rx aggregation session */
782 sc = le16_to_cpu(hdr->seq_ctrl);
783 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 784 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 785 skb_queue_tail(&rx->sdata->skb_queue, skb);
786 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 787 return;
1edfb1af
JB		 788 }
789
a87f736d
JB		 790 /*
791 * No locking needed -- we will only ever process one
792 * RX packet at a time, and thus own tid_agg_rx. All
793 * other code manipulating it needs to (and does) make
794 * sure that we cannot get to it any more before doing
795 * anything with it.
796 */
24a8fdad 797 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 798 return;
799
800 dont_reorder:
24a8fdad 801 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 802}
33b64eb2 803
49461622 804static ieee80211_rx_result debug_noinline
5cf121c3 805ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 806{
a7767f95 807 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 808 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 809
810 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
811 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 812 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 813 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 814 hdr->seq_ctrl)) {
554891e6 815 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 816 rx->local->dot11FrameDuplicateCount++;
817 rx->sta->num_duplicates++;
818 }
b1f93314 819 return RX_DROP_UNUSABLE;
571ecf67 820 } else
9e26297a 821 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 822 }
823
571ecf67
JB		 824 if (unlikely(rx->skb->len < 16)) {
825 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 826 return RX_DROP_MONITOR;
571ecf67
JB		 827 }
828
571ecf67
JB		 829 /* Drop disallowed frame classes based on STA auth/assoc state;
830 * IEEE 802.11, Chap 5.5.
831 *
ccd7b362
JB		 832 * mac80211 filters only based on association state, i.e. it drops
833 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 834 * deauth/disassoc frames when needed. In addition, hostapd is
835 * responsible for filtering on both auth and assoc states.
836 */
33b64eb2 837
902acc78 838 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 839 return ieee80211_rx_mesh_check(rx);
33b64eb2 840
a7767f95
HH		 841 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
842 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 843 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 844 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 845 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
2a33bee2
GE		 846 if (rx->sta && rx->sta->dummy &&
847 ieee80211_is_data_present(hdr->frame_control)) {
848 u16 ethertype;
849 u8 *payload;
850
851 payload = rx->skb->data +
852 ieee80211_hdrlen(hdr->frame_control);
853 ethertype = (payload[6] << 8) | payload[7];
854 if (cpu_to_be16(ethertype) ==
855 rx->sdata->control_port_protocol)
856 return RX_CONTINUE;
857 }
e4c26add 858 return RX_DROP_MONITOR;
2a33bee2 859 }
571ecf67 860
9ae54c84 861 return RX_CONTINUE;
570bd537
JB		 862}
863
864
49461622 865static ieee80211_rx_result debug_noinline
5cf121c3 866ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 867{
eb9fb5b8
JB		 868 struct sk_buff *skb = rx->skb;
869 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
870 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 871 int keyidx;
872 int hdrlen;
e4c26add 873 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 874 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 875 int mmie_keyidx = -1;
761ab470 876 __le16 fc;
570bd537 877
3017b80b
JB		 878 /*
879 * Key selection 101
880 *
3cfcf6ac 881 * There are four types of keys:
3017b80b 882 * - GTK (group keys)
3cfcf6ac 883 * - IGTK (group keys for management frames)
3017b80b
JB		 884 * - PTK (pairwise keys)
885 * - STK (station-to-station pairwise keys)
886 *
887 * When selecting a key, we have to distinguish between multicast
888 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 889 * use PTKs and STKs while the former always use GTKs and IGTKs.
890 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
891 * unicast frames can also use key indices like GTKs. Hence, if we
892 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 893 *
8dc06a1c
JB		 894 * Note that in a regular BSS, multicast frames are sent by the
895 * AP only, associated stations unicast the frame to the AP first
896 * which then multicasts it on their behalf.
897 *
3017b80b
JB		 898 * There is also a slight problem in IBSS mode: GTKs are negotiated
899 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 900 * The spec seems to expect that one negotiates the same key with
901 * every station but there's no such requirement; VLANs could be
902 * possible.
3017b80b
JB		 903 */
904
3017b80b 905 /*
1990af8d 906 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 907 * addressed to us nor a multicast frame.
908 */
554891e6 909 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 910 return RX_CONTINUE;
3017b80b 911
2569a826
JB		 912 /* start without a key */
913 rx->key = NULL;
914
d4e46a3d 915 if (rx->sta)
e31b8213 916 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 917
761ab470
JB		 918 fc = hdr->frame_control;
919
920 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 921 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
922
e31b8213
JB		 923 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
924 rx->key = sta_ptk;
dc1580dd
JB		 925 if ((status->flag & RX_FLAG_DECRYPTED) &&
926 (status->flag & RX_FLAG_IV_STRIPPED))
927 return RX_CONTINUE;
0c7c10c7 928 /* Skip decryption if the frame is not protected. */
761ab470 929 if (!ieee80211_has_protected(fc))
0c7c10c7 930 return RX_CONTINUE;
3cfcf6ac
JM		 931 } else if (mmie_keyidx >= 0) {
932 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 933 if ((status->flag & RX_FLAG_DECRYPTED) &&
934 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 935 return RX_CONTINUE;
936
937 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
938 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
939 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 940 if (rx->sta)
941 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
942 if (!rx->key)
943 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 944 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 945 /*
946 * The frame was not protected, so skip decryption. However, we
947 * need to set rx->key if there is a key that could have been
948 * used so that the frame may be dropped if encryption would
949 * have been expected.
950 */
951 struct ieee80211_key *key = NULL;
897bed8b
JB		 952 struct ieee80211_sub_if_data *sdata = rx->sdata;
953 int i;
954
761ab470 955 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 956 is_multicast_ether_addr(hdr->addr1) &&
957 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
958 rx->key = key;
897bed8b
JB		 959 else {
960 if (rx->sta) {
961 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
962 key = rcu_dereference(rx->sta->gtk[i]);
963 if (key)
964 break;
965 }
966 }
967 if (!key) {
968 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
969 key = rcu_dereference(sdata->keys[i]);
970 if (key)
971 break;
972 }
973 }
974 if (key)
975 rx->key = key;
976 }
0c7c10c7 977 return RX_CONTINUE;
571ecf67 978 } else {
39184b15 979 u8 keyid;
3017b80b
JB		 980 /*
981 * The device doesn't give us the IV so we won't be
982 * able to look up the key. That's ok though, we
983 * don't need to decrypt the frame, we just won't
984 * be able to keep statistics accurate.
985 * Except for key threshold notifications, should
986 * we somehow allow the driver to tell us which key
987 * the hardware used if this flag is set?
988 */
eb9fb5b8
JB		 989 if ((status->flag & RX_FLAG_DECRYPTED) &&
990 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 991 return RX_CONTINUE;
3017b80b 992
761ab470 993 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 994
995 if (rx->skb->len < 8 + hdrlen)
e4c26add 996 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 997
998 /*
999 * no need to call ieee80211_wep_get_keyidx,
1000 * it verifies a bunch of things we've done already
1001 */
39184b15
ZY		 1002 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1003 keyidx = keyid >> 6;
3017b80b 1004
e31b8213
JB		 1005 /* check per-station GTK first, if multicast packet */
1006 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1007 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1008
e31b8213
JB		 1009 /* if not found, try default key */
1010 if (!rx->key) {
1011 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1012
1013 /*
1014 * RSNA-protected unicast frames should always be
1015 * sent with pairwise or station-to-station keys,
1016 * but for WEP we allow using a key index as well.
1017 */
1018 if (rx->key &&
1019 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1020 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1021 !is_multicast_ether_addr(hdr->addr1))
1022 rx->key = NULL;
1023 }
571ecf67
JB		 1024 }
1025
3017b80b 1026 if (rx->key) {
95acac61
JB		 1027 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1028 return RX_DROP_MONITOR;
1029
571ecf67 1030 rx->key->tx_rx_count++;
011bfcc4 1031 /* TODO: add threshold stuff again */
1990af8d 1032 } else {
e4c26add 1033 return RX_DROP_MONITOR;
70f08765
JB		 1034 }
1035
39184b15
ZY		 1036 if (skb_linearize(rx->skb))
1037 return RX_DROP_UNUSABLE;
761ab470 1038 /* the hdr variable is invalid now! */
1990af8d 1039
97359d12
JB		 1040 switch (rx->key->conf.cipher) {
1041 case WLAN_CIPHER_SUITE_WEP40:
1042 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1043 /* Check for weak IVs if possible */
1044 if (rx->sta && ieee80211_is_data(fc) &&
1045 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1046 !(status->flag & RX_FLAG_DECRYPTED)) &&
1047 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1048 rx->sta->wep_weak_iv_count++;
1049
e2f036da
MN		 1050 result = ieee80211_crypto_wep_decrypt(rx);
1051 break;
97359d12 1052 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1053 result = ieee80211_crypto_tkip_decrypt(rx);
1054 break;
97359d12 1055 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1056 result = ieee80211_crypto_ccmp_decrypt(rx);
1057 break;
97359d12 1058 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1059 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1060 break;
3ffc2a90
JB		 1061 default:
1062 /*
1063 * We can reach here only with HW-only algorithms
1064 * but why didn't it decrypt the frame?!
1065 */
1066 return RX_DROP_UNUSABLE;
70f08765
JB		 1067 }
1068
e2f036da 1069 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1070 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1071
1072 return result;
70f08765
JB		 1073}
1074
572e0012
KV		 1075static ieee80211_rx_result debug_noinline
1076ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1077{
1078 struct ieee80211_local *local;
1079 struct ieee80211_hdr *hdr;
1080 struct sk_buff *skb;
1081
1082 local = rx->local;
1083 skb = rx->skb;
1084 hdr = (struct ieee80211_hdr *) skb->data;
1085
1086 if (!local->pspolling)
1087 return RX_CONTINUE;
1088
1089 if (!ieee80211_has_fromds(hdr->frame_control))
1090 /* this is not from AP */
1091 return RX_CONTINUE;
1092
1093 if (!ieee80211_is_data(hdr->frame_control))
1094 return RX_CONTINUE;
1095
1096 if (!ieee80211_has_moredata(hdr->frame_control)) {
1097 /* AP has no more frames buffered for us */
1098 local->pspolling = false;
1099 return RX_CONTINUE;
1100 }
1101
1102 /* more data bit is set, let's request a new frame from the AP */
1103 ieee80211_send_pspoll(local, rx->sdata);
1104
1105 return RX_CONTINUE;
1106}
1107
133b8226 1108static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1109{
133b8226 1110 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1111 struct ieee80211_local *local = sdata->local;
0795af57 1112
3e122be0 1113 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1114 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1115 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1116 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1117#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1118 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1119 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1120#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1121}
1122
ff9458d3 1123static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1124{
133b8226 1125 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1126
3e122be0 1127 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1128
571ecf67 1129#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1130 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1131 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1132#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1133
c2c98fde 1134 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1135#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1136 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1137 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1138#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1139 return;
1140 }
1141
1142 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1143}
1144
d057e5a3
AN		 1145int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1146{
1147 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1148 bool in_ps;
1149
1150 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1151
1152 /* Don't let the same PS state be set twice */
c2c98fde 1153 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1154 if ((start && in_ps) || (!start && !in_ps))
1155 return -EINVAL;
1156
1157 if (start)
1158 ap_sta_ps_start(sta_inf);
1159 else
1160 ap_sta_ps_end(sta_inf);
1161
1162 return 0;
1163}
1164EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1165
47086fc5
JB		 1166static ieee80211_rx_result debug_noinline
1167ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1168{
1169 struct ieee80211_sub_if_data *sdata = rx->sdata;
1170 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1171 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1172 int tid, ac;
1173
1174 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1175 return RX_CONTINUE;
1176
1177 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1178 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1179 return RX_CONTINUE;
1180
1181 /*
1182 * The device handles station powersave, so don't do anything about
1183 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1184 * it to mac80211 since they're handled.)
1185 */
1186 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1187 return RX_CONTINUE;
1188
1189 /*
1190 * Don't do anything if the station isn't already asleep. In
1191 * the uAPSD case, the station will probably be marked asleep,
1192 * in the PS-Poll case the station must be confused ...
1193 */
c2c98fde 1194 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1195 return RX_CONTINUE;
1196
1197 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1198 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1199 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1200 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1201 else
c2c98fde 1202 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1203 }
47086fc5
JB		 1204
1205 /* Free PS Poll skb here instead of returning RX_DROP that would
1206 * count as an dropped frame. */
1207 dev_kfree_skb(rx->skb);
1208
1209 return RX_QUEUED;
1210 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1211 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1212 ieee80211_has_pm(hdr->frame_control) &&
1213 (ieee80211_is_data_qos(hdr->frame_control) ||
1214 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1215 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1216 ac = ieee802_1d_to_ac[tid & 7];
1217
1218 /*
1219 * If this AC is not trigger-enabled do nothing.
1220 *
1221 * NB: This could/should check a separate bitmap of trigger-
1222 * enabled queues, but for now we only implement uAPSD w/o
1223 * TSPEC changes to the ACs, so they're always the same.
1224 */
1225 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1226 return RX_CONTINUE;
1227
1228 /* if we are in a service period, do nothing */
c2c98fde 1229 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1230 return RX_CONTINUE;
1231
c2c98fde 1232 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1233 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1234 else
c2c98fde 1235 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1236 }
1237
1238 return RX_CONTINUE;
1239}
1240
49461622 1241static ieee80211_rx_result debug_noinline
5cf121c3 1242ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1243{
1244 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1245 struct sk_buff *skb = rx->skb;
1246 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1247 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1248
1249 if (!sta)
9ae54c84 1250 return RX_CONTINUE;
571ecf67 1251
b291ba11
JB		 1252 /*
1253 * Update last_rx only for IBSS packets which are for the current
1254 * BSSID to avoid keeping the current IBSS network alive in cases
1255 * where other STAs start using different BSSID.
1256 */
05c914fe 1257 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1258 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1259 NL80211_IFTYPE_ADHOC);
3af6334c 1260 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1261 sta->last_rx = jiffies;
3af6334c
FF		 1262 if (ieee80211_is_data(hdr->frame_control)) {
1263 sta->last_rx_rate_idx = status->rate_idx;
1264 sta->last_rx_rate_flag = status->flag;
1265 }
1266 }
b291ba11
JB		 1267 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1268 /*
33b64eb2
LCC		 1269 * Mesh beacons will update last_rx when if they are found to
1270 * match the current local configuration when processed.
571ecf67 1271 */
b291ba11 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 }
571ecf67
JB		 1277 }
1278
554891e6 1279 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1280 return RX_CONTINUE;
571ecf67 1281
3cf335d5
KV		 1282 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1283 ieee80211_sta_rx_notify(rx->sdata, hdr);
1284
571ecf67
JB		 1285 sta->rx_fragments++;
1286 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1287 sta->last_signal = status->signal;
541a45a1 1288 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1289
72eaa43a
JB		 1290 /*
1291 * Change STA power saving mode only at the end of a frame
1292 * exchange sequence.
1293 */
d057e5a3
AN		 1294 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1295 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1296 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1297 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1298 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1299 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1300 /*
1301 * Ignore doze->wake transitions that are
1302 * indicated by non-data frames, the standard
1303 * is unclear here, but for example going to
1304 * PS mode and then scanning would cause a
1305 * doze->wake transition for the probe request,
1306 * and that is clearly undesirable.
1307 */
1308 if (ieee80211_is_data(hdr->frame_control) &&
1309 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1310 ap_sta_ps_end(sta);
72eaa43a
JB		 1311 } else {
1312 if (ieee80211_has_pm(hdr->frame_control))
1313 ap_sta_ps_start(sta);
1314 }
571ecf67
JB		 1315 }
1316
22403def
JB		 1317 /*
1318 * Drop (qos-)data::nullfunc frames silently, since they
1319 * are used only to control station power saving mode.
1320 */
1321 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1322 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1323 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1324
1325 /*
1326 * If we receive a 4-addr nullfunc frame from a STA
1327 * that was not moved to a 4-addr STA vlan yet, drop
1328 * the frame to the monitor interface, to make sure
1329 * that hostapd sees it
1330 */
1331 if (ieee80211_has_a4(hdr->frame_control) &&
1332 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1333 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1334 !rx->sdata->u.vlan.sta)))
1335 return RX_DROP_MONITOR;
22403def
JB		 1336 /*
1337 * Update counter and free packet here to avoid
1338 * counting this as a dropped packed.
1339 */
571ecf67
JB		 1340 sta->rx_packets++;
1341 dev_kfree_skb(rx->skb);
9ae54c84 1342 return RX_QUEUED;
571ecf67
JB		 1343 }
1344
9ae54c84 1345 return RX_CONTINUE;
571ecf67
JB		 1346} /* ieee80211_rx_h_sta_process */
1347
571ecf67
JB		 1348static inline struct ieee80211_fragment_entry *
1349ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1350 unsigned int frag, unsigned int seq, int rx_queue,
1351 struct sk_buff **skb)
1352{
1353 struct ieee80211_fragment_entry *entry;
1354 int idx;
1355
1356 idx = sdata->fragment_next;
1357 entry = &sdata->fragments[sdata->fragment_next++];
1358 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1359 sdata->fragment_next = 0;
1360
1361 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1362#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1363 struct ieee80211_hdr *hdr =
1364 (struct ieee80211_hdr *) entry->skb_list.next->data;
1365 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1366 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1367 "addr1=%pM addr2=%pM\n",
47846c9b 1368 sdata->name, idx,
571ecf67 1369 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1370 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1371#endif
571ecf67
JB		 1372 __skb_queue_purge(&entry->skb_list);
1373 }
1374
1375 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1376 *skb = NULL;
1377 entry->first_frag_time = jiffies;
1378 entry->seq = seq;
1379 entry->rx_queue = rx_queue;
1380 entry->last_frag = frag;
1381 entry->ccmp = 0;
1382 entry->extra_len = 0;
1383
1384 return entry;
1385}
1386
1387static inline struct ieee80211_fragment_entry *
1388ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1389 unsigned int frag, unsigned int seq,
571ecf67
JB		 1390 int rx_queue, struct ieee80211_hdr *hdr)
1391{
1392 struct ieee80211_fragment_entry *entry;
1393 int i, idx;
1394
1395 idx = sdata->fragment_next;
1396 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1397 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1398
1399 idx--;
1400 if (idx < 0)
1401 idx = IEEE80211_FRAGMENT_MAX - 1;
1402
1403 entry = &sdata->fragments[idx];
1404 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1405 entry->rx_queue != rx_queue ||
1406 entry->last_frag + 1 != frag)
1407 continue;
1408
b73d70ad 1409 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1410
b73d70ad
HH		 1411 /*
1412 * Check ftype and addresses are equal, else check next fragment
1413 */
1414 if (((hdr->frame_control ^ f_hdr->frame_control) &
1415 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1416 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1417 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1418 continue;
1419
ab46623e 1420 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1421 __skb_queue_purge(&entry->skb_list);
1422 continue;
1423 }
1424 return entry;
1425 }
1426
1427 return NULL;
1428}
1429
49461622 1430static ieee80211_rx_result debug_noinline
5cf121c3 1431ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1432{
1433 struct ieee80211_hdr *hdr;
1434 u16 sc;
358c8d9d 1435 __le16 fc;
571ecf67
JB		 1436 unsigned int frag, seq;
1437 struct ieee80211_fragment_entry *entry;
1438 struct sk_buff *skb;
554891e6 1439 struct ieee80211_rx_status *status;
571ecf67 1440
b73d70ad 1441 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1442 fc = hdr->frame_control;
571ecf67
JB		 1443 sc = le16_to_cpu(hdr->seq_ctrl);
1444 frag = sc & IEEE80211_SCTL_FRAG;
1445
358c8d9d 1446 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1447 (rx->skb)->len < 24 ||
1448 is_multicast_ether_addr(hdr->addr1))) {
1449 /* not fragmented */
1450 goto out;
1451 }
1452 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1453
e3cf8b3f
ZY		 1454 if (skb_linearize(rx->skb))
1455 return RX_DROP_UNUSABLE;
1456
058897a4
AK		 1457 /*
1458 * skb_linearize() might change the skb->data and
1459 * previously cached variables (in this case, hdr) need to
1460 * be refreshed with the new data.
1461 */
1462 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1463 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1464
1465 if (frag == 0) {
1466 /* This is the first fragment of a new frame. */
1467 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1468 rx->seqno_idx, &(rx->skb));
97359d12 1469 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1470 ieee80211_has_protected(fc)) {
9e26297a 1471 int queue = rx->security_idx;
571ecf67
JB		 1472 /* Store CCMP PN so that we can verify that the next
1473 * fragment has a sequential PN value. */
1474 entry->ccmp = 1;
1475 memcpy(entry->last_pn,
9190252c 1476 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1477 CCMP_PN_LEN);
1478 }
9ae54c84 1479 return RX_QUEUED;
571ecf67
JB		 1480 }
1481
1482 /* This is a fragment for a frame that should already be pending in
1483 * fragment cache. Add this fragment to the end of the pending entry.
1484 */
9e26297a
JB		 1485 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1486 rx->seqno_idx, hdr);
571ecf67
JB		 1487 if (!entry) {
1488 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1489 return RX_DROP_MONITOR;
571ecf67
JB		 1490 }
1491
1492 /* Verify that MPDUs within one MSDU have sequential PN values.
1493 * (IEEE 802.11i, 8.3.3.4.5) */
1494 if (entry->ccmp) {
1495 int i;
1496 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1497 int queue;
97359d12 1498 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1499 return RX_DROP_UNUSABLE;
571ecf67
JB		 1500 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1501 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1502 pn[i]++;
1503 if (pn[i])
1504 break;
1505 }
9e26297a 1506 queue = rx->security_idx;
9190252c 1507 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1508 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1509 return RX_DROP_UNUSABLE;
571ecf67
JB		 1510 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1511 }
1512
358c8d9d 1513 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1514 __skb_queue_tail(&entry->skb_list, rx->skb);
1515 entry->last_frag = frag;
1516 entry->extra_len += rx->skb->len;
358c8d9d 1517 if (ieee80211_has_morefrags(fc)) {
571ecf67 1518 rx->skb = NULL;
9ae54c84 1519 return RX_QUEUED;
571ecf67
JB		 1520 }
1521
1522 rx->skb = __skb_dequeue(&entry->skb_list);
1523 if (skb_tailroom(rx->skb) < entry->extra_len) {
1524 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1525 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1526 GFP_ATOMIC))) {
1527 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1528 __skb_queue_purge(&entry->skb_list);
e4c26add 1529 return RX_DROP_UNUSABLE;
571ecf67
JB		 1530 }
1531 }
1532 while ((skb = __skb_dequeue(&entry->skb_list))) {
1533 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1534 dev_kfree_skb(skb);
1535 }
1536
1537 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1538 status = IEEE80211_SKB_RXCB(rx->skb);
1539 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1540
1541 out:
1542 if (rx->sta)
1543 rx->sta->rx_packets++;
1544 if (is_multicast_ether_addr(hdr->addr1))
1545 rx->local->dot11MulticastReceivedFrameCount++;
1546 else
1547 ieee80211_led_rx(rx->local);
9ae54c84 1548 return RX_CONTINUE;
571ecf67
JB		 1549}
1550
49461622 1551static ieee80211_rx_result debug_noinline
5cf121c3 1552ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1553{
6e0d114d 1554 u8 *data = rx->skb->data;
238f74a2 1555 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1556
238f74a2 1557 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1558 return RX_CONTINUE;
6e0d114d
JB		 1559
1560 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1561 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1562 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1563 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1564 /* change frame type to non QOS */
238f74a2 1565 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1566
9ae54c84 1567 return RX_CONTINUE;
6e0d114d
JB		 1568}
1569
76ee65bf 1570static int
5cf121c3 1571ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1572{
07346f81 1573 if (unlikely(!rx->sta ||
c2c98fde 1574 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1575 return -EACCES;
571ecf67 1576
76ee65bf 1577 return 0;
571ecf67
JB		 1578}
1579
76ee65bf 1580static int
358c8d9d 1581ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1582{
eb9fb5b8
JB		 1583 struct sk_buff *skb = rx->skb;
1584 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1585
3017b80b 1586 /*
7848ba7d
JB		 1587 * Pass through unencrypted frames if the hardware has
1588 * decrypted them already.
3017b80b 1589 */
eb9fb5b8 1590 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1591 return 0;
571ecf67
JB		 1592
1593 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1594 if (unlikely(!ieee80211_has_protected(fc) &&
1595 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1596 ieee80211_is_data(fc) &&
b3fc9c6c 1597 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1598 return -EACCES;
bef5d1c7
JB		 1599
1600 return 0;
1601}
1602
1603static int
1604ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1605{
1606 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1607 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1608 __le16 fc = hdr->frame_control;
bef5d1c7 1609
e3efca0a
JM		 1610 /*
1611 * Pass through unencrypted frames if the hardware has
1612 * decrypted them already.
1613 */
1614 if (status->flag & RX_FLAG_DECRYPTED)
1615 return 0;
bef5d1c7 1616
c2c98fde 1617 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1618 if (unlikely(!ieee80211_has_protected(fc) &&
1619 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1620 rx->key)) {
1621 if (ieee80211_is_deauth(fc))
1622 cfg80211_send_unprot_deauth(rx->sdata->dev,
1623 rx->skb->data,
1624 rx->skb->len);
1625 else if (ieee80211_is_disassoc(fc))
1626 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1627 rx->skb->data,
1628 rx->skb->len);
f2ca3ea4 1629 return -EACCES;
cf4e594e 1630 }
f2ca3ea4 1631 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1632 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1633 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1634 if (ieee80211_is_deauth(fc))
1635 cfg80211_send_unprot_deauth(rx->sdata->dev,
1636 rx->skb->data,
1637 rx->skb->len);
1638 else if (ieee80211_is_disassoc(fc))
1639 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1640 rx->skb->data,
1641 rx->skb->len);
f2ca3ea4 1642 return -EACCES;
cf4e594e 1643 }
f2ca3ea4
JM		 1644 /*
1645 * When using MFP, Action frames are not allowed prior to
1646 * having configured keys.
1647 */
1648 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1649 ieee80211_is_robust_mgmt_frame(
1650 (struct ieee80211_hdr *) rx->skb->data)))
1651 return -EACCES;
1652 }
b3fc9c6c 1653
76ee65bf 1654 return 0;
571ecf67
JB		 1655}
1656
76ee65bf 1657static int
4114fa21 1658__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1659{
eb9fb5b8 1660 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1661 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1662 bool check_port_control = false;
1663 struct ethhdr *ehdr;
1664 int ret;
f14543ee 1665
4114fa21 1666 *port_control = false;
9bc383de
JB		 1667 if (ieee80211_has_a4(hdr->frame_control) &&
1668 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1669 return -1;
9bc383de 1670
fbb327c5
FF		 1671 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1672 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1673
1674 if (!sdata->u.mgd.use_4addr)
1675 return -1;
1676 else
1677 check_port_control = true;
1678 }
1679
9bc383de 1680 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1681 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1682 return -1;
571ecf67 1683
fbb327c5 1684 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1685 if (ret < 0)
fbb327c5
FF		 1686 return ret;
1687
1688 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1689 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1690 *port_control = true;
1691 else if (check_port_control)
fbb327c5
FF		 1692 return -1;
1693
1694 return 0;
76ee65bf 1695}
571ecf67 1696
ce3edf6d
JB		 1697/*
1698 * requires that rx->skb is a frame with ethernet header
1699 */
358c8d9d 1700static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1701{
c97c23e3 1702 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1703 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1704 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1705
1706 /*
1707 * Allow EAPOL frames to us/the PAE group address regardless
1708 * of whether the frame was encrypted or not.
1709 */
a621fa4d 1710 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1711 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1712 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1713 return true;
1714
1715 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1716 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1717 return false;
1718
1719 return true;
1720}
1721
1722/*
1723 * requires that rx->skb is a frame with ethernet header
1724 */
76ee65bf 1725static void
5cf121c3 1726ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1727{
eb9fb5b8
JB		 1728 struct ieee80211_sub_if_data *sdata = rx->sdata;
1729 struct net_device *dev = sdata->dev;
76ee65bf 1730 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1731 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1732 struct sta_info *dsta;
554891e6 1733 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1734
76ee65bf
RR		 1735 skb = rx->skb;
1736 xmit_skb = NULL;
571ecf67 1737
05c914fe
JB		 1738 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1739 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1740 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1741 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1742 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1743 if (is_multicast_ether_addr(ehdr->h_dest)) {
1744 /*
1745 * send multicast frames both to higher layers in
1746 * local net stack and back to the wireless medium
1747 */
76ee65bf
RR		 1748 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1749 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1750 printk(KERN_DEBUG "%s: failed to clone "
1751 "multicast frame\n", dev->name);
1752 } else {
abe60632
JB		 1753 dsta = sta_info_get(sdata, skb->data);
1754 if (dsta) {
ce3edf6d
JB		 1755 /*
1756 * The destination station is associated to
1757 * this AP (in this VLAN), so send the frame
1758 * directly to it and do not pass it to local
1759 * net stack.
571ecf67 1760 */
76ee65bf 1761 xmit_skb = skb;
571ecf67
JB		 1762 skb = NULL;
1763 }
571ecf67
JB		 1764 }
1765 }
1766
1767 if (skb) {
d1c3a37c
JB		 1768 int align __maybe_unused;
1769
59d9cb07 1770#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1771 /*
1772 * 'align' will only take the values 0 or 2 here
1773 * since all frames are required to be aligned
1774 * to 2-byte boundaries when being passed to
1775 * mac80211. That also explains the __skb_push()
1776 * below.
1777 */
dacb6f1d 1778 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1779 if (align) {
1780 if (WARN_ON(skb_headroom(skb) < 3)) {
1781 dev_kfree_skb(skb);
1782 skb = NULL;
1783 } else {
1784 u8 *data = skb->data;
8ce0b589
ZY		 1785 size_t len = skb_headlen(skb);
1786 skb->data -= align;
1787 memmove(skb->data, data, len);
1788 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1789 }
1790 }
1791#endif
1792
1793 if (skb) {
1794 /* deliver to local stack */
1795 skb->protocol = eth_type_trans(skb, dev);
1796 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1797 netif_receive_skb(skb);
d1c3a37c 1798 }
571ecf67
JB		 1799 }
1800
76ee65bf 1801 if (xmit_skb) {
571ecf67 1802 /* send to wireless media */
f831e909 1803 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1804 skb_reset_network_header(xmit_skb);
1805 skb_reset_mac_header(xmit_skb);
76ee65bf 1806 dev_queue_xmit(xmit_skb);
571ecf67 1807 }
76ee65bf
RR		 1808}
1809
49461622 1810static ieee80211_rx_result debug_noinline
5cf121c3 1811ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1812{
eb9fb5b8 1813 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1814 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1815 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1816 __le16 fc = hdr->frame_control;
eaf85ca7 1817 struct sk_buff_head frame_list;
554891e6 1818 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1819
358c8d9d 1820 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1821 return RX_CONTINUE;
fd4c7f2f 1822
358c8d9d 1823 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1824 return RX_DROP_MONITOR;
fd4c7f2f 1825
554891e6 1826 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1827 return RX_CONTINUE;
fd4c7f2f 1828
eaf85ca7
ZY		 1829 if (ieee80211_has_a4(hdr->frame_control) &&
1830 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1831 !rx->sdata->u.vlan.sta)
e4c26add 1832 return RX_DROP_UNUSABLE;
fd4c7f2f 1833
eaf85ca7
ZY		 1834 if (is_multicast_ether_addr(hdr->addr1) &&
1835 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1836 rx->sdata->u.vlan.sta) ||
1837 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1838 rx->sdata->u.mgd.use_4addr)))
e4c26add 1839 return RX_DROP_UNUSABLE;
fd4c7f2f 1840
eaf85ca7
ZY		 1841 skb->dev = dev;
1842 __skb_queue_head_init(&frame_list);
fd4c7f2f 1843
e3cf8b3f
ZY		 1844 if (skb_linearize(skb))
1845 return RX_DROP_UNUSABLE;
1846
eaf85ca7
ZY		 1847 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1848 rx->sdata->vif.type,
8b3becad 1849 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1850
eaf85ca7
ZY		 1851 while (!skb_queue_empty(&frame_list)) {
1852 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1853
358c8d9d 1854 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1855 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1856 continue;
1857 }
eaf85ca7
ZY		 1858 dev->stats.rx_packets++;
1859 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1860
1861 ieee80211_deliver_skb(rx);
1862 }
1863
9ae54c84 1864 return RX_QUEUED;
fd4c7f2f
RR		 1865}
1866
bf94e17b 1867#ifdef CONFIG_MAC80211_MESH
b0dee578 1868static ieee80211_rx_result
e32f85f7
LCC		 1869ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1870{
1871 struct ieee80211_hdr *hdr;
1872 struct ieee80211s_hdr *mesh_hdr;
1873 unsigned int hdrlen;
1874 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1875 struct ieee80211_local *local = rx->local;
eb9fb5b8 1876 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1877 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1878
1879 hdr = (struct ieee80211_hdr *) skb->data;
1880 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1881 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1882
2157fdd6
TP		 1883 /* frame is in RMC, don't forward */
1884 if (ieee80211_is_data(hdr->frame_control) &&
1885 is_multicast_ether_addr(hdr->addr1) &&
1886 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1887 return RX_DROP_MONITOR;
1888
e32f85f7
LCC		 1889 if (!ieee80211_is_data(hdr->frame_control))
1890 return RX_CONTINUE;
1891
1892 if (!mesh_hdr->ttl)
1893 /* illegal frame */
1894 return RX_DROP_MONITOR;
1895
cfee66b0
JC		 1896 if (ieee80211_queue_stopped(&local->hw, skb_get_queue_mapping(skb))) {
1897 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1898 dropped_frames_congestion);
1899 return RX_DROP_MONITOR;
1900 }
1901
43b7b314 1902 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1903 struct mesh_path *mppath;
43b7b314
JC		 1904 char *proxied_addr;
1905 char *mpp_addr;
1906
1907 if (is_multicast_ether_addr(hdr->addr1)) {
1908 mpp_addr = hdr->addr3;
1909 proxied_addr = mesh_hdr->eaddr1;
1910 } else {
1911 mpp_addr = hdr->addr4;
1912 proxied_addr = mesh_hdr->eaddr2;
1913 }
79617dee 1914
79617dee 1915 rcu_read_lock();
43b7b314 1916 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1917 if (!mppath) {
43b7b314 1918 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1919 } else {
1920 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1921 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1922 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1923 spin_unlock_bh(&mppath->state_lock);
1924 }
1925 rcu_read_unlock();
1926 }
1927
3c5772a5
JC		 1928 /* Frame has reached destination. Don't forward */
1929 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1930 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1931 return RX_CONTINUE;
1932
1933 mesh_hdr->ttl--;
1934
554891e6 1935 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1936 if (!mesh_hdr->ttl)
472dbc45 1937 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1938 dropped_frames_ttl);
1939 else {
1940 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1941 struct ieee80211_tx_info *info;
1942
e32f85f7
LCC		 1943 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1944
1945 if (!fwd_skb && net_ratelimit())
1946 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1947 sdata->name);
919bbad5 1948 if (!fwd_skb)
b51aff05 1949 goto out;
e32f85f7
LCC		 1950
1951 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1952 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1953 info = IEEE80211_SKB_CB(fwd_skb);
1954 memset(info, 0, sizeof(*info));
1955 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1956 info->control.vif = &rx->sdata->vif;
4777be41 1957 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
c8a61a7d
DW		 1958 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1959 fwded_mcast);
4777be41
JC		 1960 skb_set_queue_mapping(fwd_skb,
1961 ieee80211_select_queue(sdata, fwd_skb));
2154c81c 1962 ieee80211_set_qos_hdr(sdata, fwd_skb);
4777be41 1963 } else {
3c5772a5
JC		 1964 int err;
1965 /*
1966 * Save TA to addr1 to send TA a path error if a
1967 * suitable next hop is not found
1968 */
1969 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1970 ETH_ALEN);
3c5772a5 1971 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1972 /* Failed to immediately resolve next hop:
1973 * fwded frame was dropped or will be added
1974 * later to the pending skb queue. */
1975 if (err)
1976 return RX_DROP_MONITOR;
c8a61a7d
DW		 1977
1978 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1979 fwded_unicast);
249b405c
JC		 1980 }
1981 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1982 fwded_frames);
3b8d81e0 1983 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1984 }
1985 }
1986
b51aff05 1987 out:
3c5772a5 1988 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1989 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1990 return RX_CONTINUE;
1991 else
1992 return RX_DROP_MONITOR;
1993}
bf94e17b 1994#endif
e32f85f7 1995
49461622 1996static ieee80211_rx_result debug_noinline
5cf121c3 1997ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1998{
eb9fb5b8 1999 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2000 struct ieee80211_local *local = rx->local;
eb9fb5b8 2001 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2002 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2003 __le16 fc = hdr->frame_control;
4114fa21 2004 bool port_control;
ce3edf6d 2005 int err;
76ee65bf 2006
358c8d9d 2007 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2008 return RX_CONTINUE;
76ee65bf 2009
358c8d9d 2010 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2011 return RX_DROP_MONITOR;
76ee65bf 2012
f14543ee
FF		 2013 /*
2014 * Allow the cooked monitor interface of an AP to see 4-addr frames so
2015 * that a 4-addr station can be detected and moved into a separate VLAN
2016 */
2017 if (ieee80211_has_a4(hdr->frame_control) &&
2018 sdata->vif.type == NL80211_IFTYPE_AP)
2019 return RX_DROP_MONITOR;
2020
4114fa21 2021 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2022 if (unlikely(err))
e4c26add 2023 return RX_DROP_UNUSABLE;
76ee65bf 2024
358c8d9d 2025 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2026 return RX_DROP_MONITOR;
ce3edf6d 2027
4114fa21
FF		 2028 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2029 unlikely(port_control) && sdata->bss) {
2030 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2031 u.ap);
2032 dev = sdata->dev;
2033 rx->sdata = sdata;
2034 }
2035
76ee65bf
RR		 2036 rx->skb->dev = dev;
2037
2038 dev->stats.rx_packets++;
2039 dev->stats.rx_bytes += rx->skb->len;
2040
08ca944e 2041 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2042 !is_multicast_ether_addr(
2043 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2044 (!local->scanning &&
2045 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2046 mod_timer(&local->dynamic_ps_timer, jiffies +
2047 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2048 }
2049
76ee65bf 2050 ieee80211_deliver_skb(rx);
571ecf67 2051
9ae54c84 2052 return RX_QUEUED;
571ecf67
JB		 2053}
2054
49461622 2055static ieee80211_rx_result debug_noinline
24a8fdad 2056ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2057{
2058 struct ieee80211_local *local = rx->local;
2059 struct ieee80211_hw *hw = &local->hw;
2060 struct sk_buff *skb = rx->skb;
a7767f95 2061 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2062 struct tid_ampdu_rx *tid_agg_rx;
2063 u16 start_seq_num;
2064 u16 tid;
2065
a7767f95 2066 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2067 return RX_CONTINUE;
71364716 2068
a7767f95 2069 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2070 struct {
2071 __le16 control, start_seq_num;
2072 } __packed bar_data;
2073
71364716 2074 if (!rx->sta)
a02ae758 2075 return RX_DROP_MONITOR;
8ae5977f
JB		 2076
2077 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2078 &bar_data, sizeof(bar_data)))
2079 return RX_DROP_MONITOR;
2080
8ae5977f 2081 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2082
2083 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2084 if (!tid_agg_rx)
a02ae758 2085 return RX_DROP_MONITOR;
71364716 2086
8ae5977f 2087 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2088
2089 /* reset session timer */
20ad19d0
JB		 2090 if (tid_agg_rx->timeout)
2091 mod_timer(&tid_agg_rx->session_timer,
2092 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2093
dd318575 2094 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2095 /* release stored frames up to start of BAR */
24a8fdad 2096 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2097 spin_unlock(&tid_agg_rx->reorder_lock);
2098
a02ae758
JB		 2099 kfree_skb(skb);
2100 return RX_QUEUED;
71364716
RR		 2101 }
2102
08daecae
JB		 2103 /*
2104 * After this point, we only want management frames,
2105 * so we can drop all remaining control frames to
2106 * cooked monitor interfaces.
2107 */
2108 return RX_DROP_MONITOR;
71364716
RR		 2109}
2110
f4f727a6
JM		 2111static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2112 struct ieee80211_mgmt *mgmt,
2113 size_t len)
fea14732
JM		 2114{
2115 struct ieee80211_local *local = sdata->local;
2116 struct sk_buff *skb;
2117 struct ieee80211_mgmt *resp;
2118
47846c9b 2119 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2120 /* Not to own unicast address */
2121 return;
2122 }
2123
46900298
JB		 2124 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2125 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2126 /* Not from the current AP or not associated yet. */
fea14732
JM		 2127 return;
2128 }
2129
2130 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2131 /* Too short SA Query request frame */
2132 return;
2133 }
2134
2135 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2136 if (skb == NULL)
2137 return;
2138
2139 skb_reserve(skb, local->hw.extra_tx_headroom);
2140 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2141 memset(resp, 0, 24);
2142 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2143 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2144 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2145 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2146 IEEE80211_STYPE_ACTION);
2147 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2148 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2149 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2150 memcpy(resp->u.action.u.sa_query.trans_id,
2151 mgmt->u.action.u.sa_query.trans_id,
2152 WLAN_SA_QUERY_TR_ID_LEN);
2153
62ae67be 2154 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2155}
2156
2e161f78
JB		 2157static ieee80211_rx_result debug_noinline
2158ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2159{
2160 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2161 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2162
2163 /*
2164 * From here on, look only at management frames.
2165 * Data and control frames are already handled,
2166 * and unknown (reserved) frames are useless.
2167 */
2168 if (rx->skb->len < 24)
2169 return RX_DROP_MONITOR;
2170
2171 if (!ieee80211_is_mgmt(mgmt->frame_control))
2172 return RX_DROP_MONITOR;
2173
554891e6 2174 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2175 return RX_DROP_MONITOR;
2176
2177 if (ieee80211_drop_unencrypted_mgmt(rx))
2178 return RX_DROP_UNUSABLE;
2179
2180 return RX_CONTINUE;
2181}
2182
de1ede7a
JB		 2183static ieee80211_rx_result debug_noinline
2184ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2185{
2186 struct ieee80211_local *local = rx->local;
eb9fb5b8 2187 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2188 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2189 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2190 int len = rx->skb->len;
2191
2192 if (!ieee80211_is_action(mgmt->frame_control))
2193 return RX_CONTINUE;
2194
026331c4
JM		 2195 /* drop too small frames */
2196 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2197 return RX_DROP_UNUSABLE;
de1ede7a 2198
026331c4 2199 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2200 return RX_DROP_UNUSABLE;
de1ede7a 2201
554891e6 2202 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2203 return RX_DROP_UNUSABLE;
97ebe12a 2204
de1ede7a
JB		 2205 switch (mgmt->u.action.category) {
2206 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2207 /*
2208 * The aggregation code is not prepared to handle
2209 * anything but STA/AP due to the BSSID handling;
2210 * IBSS could work in the code but isn't supported
2211 * by drivers or the standard.
2212 */
2213 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2214 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2215 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2216 break;
8abd3f9b 2217
026331c4
JM		 2218 /* verify action_code is present */
2219 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2220 break;
2221
de1ede7a
JB		 2222 switch (mgmt->u.action.u.addba_req.action_code) {
2223 case WLAN_ACTION_ADDBA_REQ:
2224 if (len < (IEEE80211_MIN_ACTION_SIZE +
2225 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2226 goto invalid;
2227 break;
de1ede7a
JB		 2228 case WLAN_ACTION_ADDBA_RESP:
2229 if (len < (IEEE80211_MIN_ACTION_SIZE +
2230 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2231 goto invalid;
2232 break;
de1ede7a
JB		 2233 case WLAN_ACTION_DELBA:
2234 if (len < (IEEE80211_MIN_ACTION_SIZE +
2235 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2236 goto invalid;
2237 break;
2238 default:
2239 goto invalid;
de1ede7a 2240 }
bed7ee6e 2241
8b58ff83 2242 goto queue;
39192c0b
JB		 2243 case WLAN_CATEGORY_SPECTRUM_MGMT:
2244 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2245 break;
46900298
JB		 2246
2247 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2248 break;
46900298 2249
026331c4
JM		 2250 /* verify action_code is present */
2251 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2252 break;
2253
39192c0b
JB		 2254 switch (mgmt->u.action.u.measurement.action_code) {
2255 case WLAN_ACTION_SPCT_MSR_REQ:
2256 if (len < (IEEE80211_MIN_ACTION_SIZE +
2257 sizeof(mgmt->u.action.u.measurement)))
84040805 2258 break;
39192c0b 2259 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2260 goto handled;
c481ec97
S		 2261 case WLAN_ACTION_SPCT_CHL_SWITCH:
2262 if (len < (IEEE80211_MIN_ACTION_SIZE +
2263 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2264 break;
c481ec97 2265
cc32abd4 2266 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2267 break;
cc32abd4 2268
46900298 2269 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2270 break;
c481ec97 2271
8b58ff83 2272 goto queue;
39192c0b
JB		 2273 }
2274 break;
fea14732
JM		 2275 case WLAN_CATEGORY_SA_QUERY:
2276 if (len < (IEEE80211_MIN_ACTION_SIZE +
2277 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2278 break;
2279
fea14732
JM		 2280 switch (mgmt->u.action.u.sa_query.action) {
2281 case WLAN_ACTION_SA_QUERY_REQUEST:
2282 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2283 break;
fea14732 2284 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2285 goto handled;
fea14732
JM		 2286 }
2287 break;
8db09850
TP		 2288 case WLAN_CATEGORY_SELF_PROTECTED:
2289 switch (mgmt->u.action.u.self_prot.action_code) {
2290 case WLAN_SP_MESH_PEERING_OPEN:
2291 case WLAN_SP_MESH_PEERING_CLOSE:
2292 case WLAN_SP_MESH_PEERING_CONFIRM:
2293 if (!ieee80211_vif_is_mesh(&sdata->vif))
2294 goto invalid;
2295 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2296 /* userspace handles this frame */
2297 break;
2298 goto queue;
2299 case WLAN_SP_MGK_INFORM:
2300 case WLAN_SP_MGK_ACK:
2301 if (!ieee80211_vif_is_mesh(&sdata->vif))
2302 goto invalid;
2303 break;
2304 }
2305 break;
d3aaec8a 2306 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2307 if (!ieee80211_vif_is_mesh(&sdata->vif))
2308 break;
25d49e4d
TP		 2309 if (mesh_action_is_path_sel(mgmt) &&
2310 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2311 break;
2312 goto queue;
84040805 2313 }
026331c4 2314
2e161f78
JB		 2315 return RX_CONTINUE;
2316
bed7ee6e 2317 invalid:
554891e6 2318 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2319 /* will return in the next handlers */
2320 return RX_CONTINUE;
2321
2322 handled:
2323 if (rx->sta)
2324 rx->sta->rx_packets++;
2325 dev_kfree_skb(rx->skb);
2326 return RX_QUEUED;
2327
2328 queue:
2329 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2330 skb_queue_tail(&sdata->skb_queue, rx->skb);
2331 ieee80211_queue_work(&local->hw, &sdata->work);
2332 if (rx->sta)
2333 rx->sta->rx_packets++;
2334 return RX_QUEUED;
2335}
2336
2337static ieee80211_rx_result debug_noinline
2338ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2339{
554891e6 2340 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2341
2342 /* skip known-bad action frames and return them in the next handler */
554891e6 2343 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2344 return RX_CONTINUE;
d7907448 2345
026331c4
JM		 2346 /*
2347 * Getting here means the kernel doesn't know how to handle
2348 * it, but maybe userspace does ... include returned frames
2349 * so userspace can register for those to know whether ones
2350 * it transmitted were processed or returned.
2351 */
026331c4 2352
2e161f78
JB		 2353 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2354 rx->skb->data, rx->skb->len,
2355 GFP_ATOMIC)) {
2356 if (rx->sta)
2357 rx->sta->rx_packets++;
2358 dev_kfree_skb(rx->skb);
2359 return RX_QUEUED;
2360 }
2361
2362
2363 return RX_CONTINUE;
2364}
2365
2366static ieee80211_rx_result debug_noinline
2367ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2368{
2369 struct ieee80211_local *local = rx->local;
2370 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2371 struct sk_buff *nskb;
2372 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2373 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2374
2375 if (!ieee80211_is_action(mgmt->frame_control))
2376 return RX_CONTINUE;
2377
2378 /*
2379 * For AP mode, hostapd is responsible for handling any action
2380 * frames that we didn't handle, including returning unknown
2381 * ones. For all other modes we will return them to the sender,
2382 * setting the 0x80 bit in the action category, as required by
2383 * 802.11-2007 7.3.1.11.
2384 * Newer versions of hostapd shall also use the management frame
2385 * registration mechanisms, but older ones still use cooked
2386 * monitor interfaces so push all frames there.
2387 */
554891e6 2388 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2389 (sdata->vif.type == NL80211_IFTYPE_AP ||
2390 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2391 return RX_DROP_MONITOR;
026331c4 2392
84040805
JB		 2393 /* do not return rejected action frames */
2394 if (mgmt->u.action.category & 0x80)
2395 return RX_DROP_UNUSABLE;
2396
2397 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2398 GFP_ATOMIC);
2399 if (nskb) {
292b4df6 2400 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2401
292b4df6
JL		 2402 nmgmt->u.action.category |= 0x80;
2403 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2404 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2405
2406 memset(nskb->cb, 0, sizeof(nskb->cb));
2407
2408 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2409 }
39192c0b
JB		 2410 dev_kfree_skb(rx->skb);
2411 return RX_QUEUED;
de1ede7a
JB		 2412}
2413
49461622 2414static ieee80211_rx_result debug_noinline
5cf121c3 2415ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2416{
eb9fb5b8 2417 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2418 ieee80211_rx_result rxs;
77a121c3
JB		 2419 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2420 __le16 stype;
571ecf67 2421
af6b6374
JB		 2422 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2423 if (rxs != RX_CONTINUE)
2424 return rxs;
2425
77a121c3 2426 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2427
77a121c3
JB		 2428 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2429 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2430 sdata->vif.type != NL80211_IFTYPE_STATION)
2431 return RX_DROP_MONITOR;
472dbc45 2432
77a121c3
JB		 2433 switch (stype) {
2434 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2435 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2436 /* process for all: mesh, mlme, ibss */
2437 break;
2438 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2439 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2440 if (is_multicast_ether_addr(mgmt->da) &&
2441 !is_broadcast_ether_addr(mgmt->da))
2442 return RX_DROP_MONITOR;
2443
77a121c3
JB		 2444 /* process only for station */
2445 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2446 return RX_DROP_MONITOR;
2447 break;
2448 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2449 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2450 /* process only for ibss */
2451 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2452 return RX_DROP_MONITOR;
2453 break;
2454 default:
2455 return RX_DROP_MONITOR;
2456 }
f9d540ee 2457
77a121c3 2458 /* queue up frame and kick off work to process it */
c1475ca9 2459 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2460 skb_queue_tail(&sdata->skb_queue, rx->skb);
2461 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2462 if (rx->sta)
2463 rx->sta->rx_packets++;
46900298 2464
77a121c3 2465 return RX_QUEUED;
571ecf67
JB		 2466}
2467
5cf121c3 2468/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2469static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2470 struct ieee80211_rate *rate)
3d30d949
MW		 2471{
2472 struct ieee80211_sub_if_data *sdata;
2473 struct ieee80211_local *local = rx->local;
2474 struct ieee80211_rtap_hdr {
2475 struct ieee80211_radiotap_header hdr;
2476 u8 flags;
5f0b7de5 2477 u8 rate_or_pad;
3d30d949
MW		 2478 __le16 chan_freq;
2479 __le16 chan_flags;
bc10502d 2480 } __packed *rthdr;
3d30d949
MW		 2481 struct sk_buff *skb = rx->skb, *skb2;
2482 struct net_device *prev_dev = NULL;
eb9fb5b8 2483 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2484
554891e6
JB		 2485 /*
2486 * If cooked monitor has been processed already, then
2487 * don't do it again. If not, set the flag.
2488 */
2489 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2490 goto out_free_skb;
554891e6 2491 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2492
3d30d949
MW		 2493 if (skb_headroom(skb) < sizeof(*rthdr) &&
2494 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2495 goto out_free_skb;
2496
2497 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2498 memset(rthdr, 0, sizeof(*rthdr));
2499 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2500 rthdr->hdr.it_present =
2501 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2502 (1 << IEEE80211_RADIOTAP_CHANNEL));
2503
5f0b7de5
JB		 2504 if (rate) {
2505 rthdr->rate_or_pad = rate->bitrate / 5;
2506 rthdr->hdr.it_present |=
2507 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2508 }
3d30d949
MW		 2509 rthdr->chan_freq = cpu_to_le16(status->freq);
2510
2511 if (status->band == IEEE80211_BAND_5GHZ)
2512 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2513 IEEE80211_CHAN_5GHZ);
2514 else
2515 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2516 IEEE80211_CHAN_2GHZ);
2517
2518 skb_set_mac_header(skb, 0);
2519 skb->ip_summed = CHECKSUM_UNNECESSARY;
2520 skb->pkt_type = PACKET_OTHERHOST;
2521 skb->protocol = htons(ETH_P_802_2);
2522
2523 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2524 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2525 continue;
2526
05c914fe 2527 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2528 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2529 continue;
2530
2531 if (prev_dev) {
2532 skb2 = skb_clone(skb, GFP_ATOMIC);
2533 if (skb2) {
2534 skb2->dev = prev_dev;
5548a8a1 2535 netif_receive_skb(skb2);
3d30d949
MW		 2536 }
2537 }
2538
2539 prev_dev = sdata->dev;
2540 sdata->dev->stats.rx_packets++;
2541 sdata->dev->stats.rx_bytes += skb->len;
2542 }
2543
2544 if (prev_dev) {
2545 skb->dev = prev_dev;
5548a8a1 2546 netif_receive_skb(skb);
554891e6
JB		 2547 return;
2548 }
3d30d949
MW		 2549
2550 out_free_skb:
2551 dev_kfree_skb(skb);
2552}
2553
aa0c8636
CL		 2554static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2555 ieee80211_rx_result res)
2556{
2557 switch (res) {
2558 case RX_DROP_MONITOR:
2559 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2560 if (rx->sta)
2561 rx->sta->rx_dropped++;
2562 /* fall through */
2563 case RX_CONTINUE: {
2564 struct ieee80211_rate *rate = NULL;
2565 struct ieee80211_supported_band *sband;
2566 struct ieee80211_rx_status *status;
2567
2568 status = IEEE80211_SKB_RXCB((rx->skb));
2569
2570 sband = rx->local->hw.wiphy->bands[status->band];
2571 if (!(status->flag & RX_FLAG_HT))
2572 rate = &sband->bitrates[status->rate_idx];
2573
2574 ieee80211_rx_cooked_monitor(rx, rate);
2575 break;
2576 }
2577 case RX_DROP_UNUSABLE:
2578 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2579 if (rx->sta)
2580 rx->sta->rx_dropped++;
2581 dev_kfree_skb(rx->skb);
2582 break;
2583 case RX_QUEUED:
2584 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2585 break;
2586 }
2587}
571ecf67 2588
24a8fdad 2589static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2590{
58905290 2591 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2592 struct sk_buff *skb;
8944b79f 2593
e32f85f7
LCC		 2594#define CALL_RXH(rxh) \
2595 do { \
2596 res = rxh(rx); \
2597 if (res != RX_CONTINUE) \
2569a826 2598 goto rxh_next; \
e32f85f7 2599 } while (0);
49461622 2600
24a8fdad
CL		 2601 spin_lock(&rx->local->rx_skb_queue.lock);
2602 if (rx->local->running_rx_handler)
2603 goto unlock;
2604
2605 rx->local->running_rx_handler = true;
2606
2607 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2608 spin_unlock(&rx->local->rx_skb_queue.lock);
2609
2569a826
JB		 2610 /*
2611 * all the other fields are valid across frames
2612 * that belong to an aMPDU since they are on the
2613 * same TID from the same station
2614 */
2615 rx->skb = skb;
2616
2617 CALL_RXH(ieee80211_rx_h_decrypt)
2618 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2619 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2620 CALL_RXH(ieee80211_rx_h_sta_process)
2621 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2622 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2623 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2624#ifdef CONFIG_MAC80211_MESH
aa0c8636 2625 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2626 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2627#endif
2154c81c
JC		 2628 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2629 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2630 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2631 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2632 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2633 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2634 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2635 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2636 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2637
aa0c8636
CL		 2638 rxh_next:
2639 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2640 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2641#undef CALL_RXH
aa0c8636 2642 }
24a8fdad
CL		 2643
2644 rx->local->running_rx_handler = false;
2645
2646 unlock:
2647 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2648}
2649
4406c376 2650static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2651{
aa0c8636
CL		 2652 ieee80211_rx_result res = RX_DROP_MONITOR;
2653
aa0c8636
CL		 2654#define CALL_RXH(rxh) \
2655 do { \
2656 res = rxh(rx); \
2657 if (res != RX_CONTINUE) \
2658 goto rxh_next; \
2659 } while (0);
2660
2661 CALL_RXH(ieee80211_rx_h_passive_scan)
2662 CALL_RXH(ieee80211_rx_h_check)
2663
24a8fdad 2664 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2665
24a8fdad 2666 ieee80211_rx_handlers(rx);
aa0c8636 2667 return;
49461622 2668
2569a826 2669 rxh_next:
aa0c8636
CL		 2670 ieee80211_rx_handlers_result(rx, res);
2671
2672#undef CALL_RXH
58905290
JB		 2673}
2674
2bff8ebf 2675/*
dd318575
JB		 2676 * This function makes calls into the RX path, therefore
2677 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2678 */
2679void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2680{
554891e6
JB		 2681 struct ieee80211_rx_data rx = {
2682 .sta = sta,
2683 .sdata = sta->sdata,
2684 .local = sta->local,
9e26297a
JB		 2685 /* This is OK -- must be QoS data frame */
2686 .security_idx = tid,
2687 .seqno_idx = tid,
fcf8bd3b 2688 .flags = 0,
554891e6 2689 };
2c15a0cf
CL		 2690 struct tid_ampdu_rx *tid_agg_rx;
2691
2692 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2693 if (!tid_agg_rx)
2694 return;
2bff8ebf 2695
2c15a0cf 2696 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2697 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2698 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2699
24a8fdad 2700 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2701}
2702
571ecf67
JB		 2703/* main receive path */
2704
20b01f80 2705static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2706 struct ieee80211_hdr *hdr)
2707{
20b01f80 2708 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2709 struct sk_buff *skb = rx->skb;
2710 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2711 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2712 int multicast = is_multicast_ether_addr(hdr->addr1);
2713
51fb61e7 2714 switch (sdata->vif.type) {
05c914fe 2715 case NL80211_IFTYPE_STATION:
9bc383de 2716 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2717 return 0;
77fdaa12 2718 if (!multicast &&
47846c9b 2719 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2720 if (!(sdata->dev->flags & IFF_PROMISC) ||
2721 sdata->u.mgd.use_4addr)
23a24def 2722 return 0;
554891e6 2723 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2724 }
2725 break;
05c914fe 2726 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2727 if (!bssid)
2728 return 0;
a7767f95 2729 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2730 return 1;
87291c02 2731 }
46900298 2732 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2733 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2734 return 0;
554891e6 2735 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2736 } else if (!multicast &&
47846c9b 2737 compare_ether_addr(sdata->vif.addr,
23a24def 2738 hdr->addr1) != 0) {
4150c572 2739 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2740 return 0;
554891e6 2741 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2742 } else if (!rx->sta) {
2743 int rate_idx;
eb9fb5b8 2744 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2745 rate_idx = 0; /* TODO: HT rates */
2746 else
eb9fb5b8 2747 rate_idx = status->rate_idx;
34e89507
JB		 2748 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2749 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2750 }
23a24def 2751 break;
05c914fe 2752 case NL80211_IFTYPE_MESH_POINT:
6032f934 2753 if (!multicast &&
47846c9b 2754 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2755 hdr->addr1) != 0) {
2756 if (!(sdata->dev->flags & IFF_PROMISC))
2757 return 0;
2758
554891e6 2759 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2760 }
2761 break;
05c914fe
JB		 2762 case NL80211_IFTYPE_AP_VLAN:
2763 case NL80211_IFTYPE_AP:
23a24def 2764 if (!bssid) {
47846c9b 2765 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2766 hdr->addr1))
2767 return 0;
2768 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2769 sdata->vif.addr)) {
771bbd09 2770 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2771 !ieee80211_is_beacon(hdr->frame_control) &&
2772 !(ieee80211_is_action(hdr->frame_control) &&
2773 sdata->vif.p2p))
23a24def 2774 return 0;
554891e6 2775 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2776 }
23a24def 2777 break;
05c914fe 2778 case NL80211_IFTYPE_WDS:
a7767f95 2779 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2780 return 0;
2781 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2782 return 0;
2783 break;
2ca27bcf 2784 default:
fb1c1cd6
JB		 2785 /* should never get here */
2786 WARN_ON(1);
2787 break;
23a24def
JB		 2788 }
2789
2790 return 1;
2791}
2792
4406c376
JB		 2793/*
2794 * This function returns whether or not the SKB
2795 * was destined for RX processing or not, which,
2796 * if consume is true, is equivalent to whether
2797 * or not the skb was consumed.
2798 */
2799static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2800 struct sk_buff *skb, bool consume)
2801{
2802 struct ieee80211_local *local = rx->local;
2803 struct ieee80211_sub_if_data *sdata = rx->sdata;
2804 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2805 struct ieee80211_hdr *hdr = (void *)skb->data;
2806 int prepares;
2807
2808 rx->skb = skb;
554891e6 2809 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2810 prepares = prepare_for_handlers(rx, hdr);
2811
2812 if (!prepares)
2813 return false;
2814
4406c376
JB		 2815 if (!consume) {
2816 skb = skb_copy(skb, GFP_ATOMIC);
2817 if (!skb) {
2818 if (net_ratelimit())
2819 wiphy_debug(local->hw.wiphy,
b305dae4 2820 "failed to copy skb for %s\n",
4406c376
JB		 2821 sdata->name);
2822 return true;
2823 }
2824
2825 rx->skb = skb;
2826 }
2827
2828 ieee80211_invoke_rx_handlers(rx);
2829 return true;
2830}
2831
571ecf67 2832/*
6368e4b1
RR		 2833 * This is the actual Rx frames handler. as it blongs to Rx path it must
2834 * be called with rcu_read_lock protection.
571ecf67 2835 */
71ebb4aa 2836static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2837 struct sk_buff *skb)
571ecf67 2838{
554891e6 2839 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2840 struct ieee80211_local *local = hw_to_local(hw);
2841 struct ieee80211_sub_if_data *sdata;
571ecf67 2842 struct ieee80211_hdr *hdr;
e3cf8b3f 2843 __le16 fc;
5cf121c3 2844 struct ieee80211_rx_data rx;
4406c376 2845 struct ieee80211_sub_if_data *prev;
56af3268 2846 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2847 int err = 0;
571ecf67 2848
e3cf8b3f 2849 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2850 memset(&rx, 0, sizeof(rx));
2851 rx.skb = skb;
2852 rx.local = local;
72abd81b 2853
e3cf8b3f 2854 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2855 local->dot11ReceivedFragmentCount++;
571ecf67 2856
142b9f50 2857 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2858 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2859 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2860
e3cf8b3f
ZY		 2861 if (ieee80211_is_mgmt(fc))
2862 err = skb_linearize(skb);
2863 else
2864 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2865
2866 if (err) {
2867 dev_kfree_skb(skb);
2868 return;
2869 }
2870
2871 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2872 ieee80211_parse_qos(&rx);
d1c3a37c 2873 ieee80211_verify_alignment(&rx);
38f3714d 2874
e3cf8b3f 2875 if (ieee80211_is_data(fc)) {
56af3268 2876 prev_sta = NULL;
4406c376 2877
2a33bee2 2878 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2879 if (!prev_sta) {
2880 prev_sta = sta;
2881 continue;
2882 }
2883
2884 rx.sta = prev_sta;
2885 rx.sdata = prev_sta->sdata;
4406c376 2886 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2887
56af3268 2888 prev_sta = sta;
4406c376 2889 }
56af3268
BG		 2890
2891 if (prev_sta) {
2892 rx.sta = prev_sta;
2893 rx.sdata = prev_sta->sdata;
2894
4406c376 2895 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2896 return;
8e26d5ad 2897 goto out;
56af3268 2898 }
4406c376
JB		 2899 }
2900
4b0dd98e 2901 prev = NULL;
b2e7771e 2902
4b0dd98e
JB		 2903 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2904 if (!ieee80211_sdata_running(sdata))
2905 continue;
340e11f3 2906
4b0dd98e
JB		 2907 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2908 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2909 continue;
340e11f3 2910
4b0dd98e
JB		 2911 /*
2912 * frame is destined for this interface, but if it's
2913 * not also for the previous one we handle that after
2914 * the loop to avoid copying the SKB once too much
2915 */
4bb29f8c 2916
4b0dd98e 2917 if (!prev) {
abe60632 2918 prev = sdata;
4b0dd98e 2919 continue;
340e11f3 2920 }
4bb29f8c 2921
2a33bee2 2922 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2923 rx.sdata = prev;
2924 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2925
4b0dd98e
JB		 2926 prev = sdata;
2927 }
2928
2929 if (prev) {
2a33bee2 2930 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2931 rx.sdata = prev;
4406c376 2932
4b0dd98e
JB		 2933 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2934 return;
571ecf67 2935 }
4406c376 2936
8e26d5ad 2937 out:
4406c376 2938 dev_kfree_skb(skb);
571ecf67 2939}
6368e4b1
RR		 2940
2941/*
2942 * This is the receive path handler. It is called by a low level driver when an
2943 * 802.11 MPDU is received from the hardware.
2944 */
103bf9f7 2945void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2946{
2947 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2948 struct ieee80211_rate *rate = NULL;
2949 struct ieee80211_supported_band *sband;
f1d58c25 2950 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2951
d20ef63d
JB		 2952 WARN_ON_ONCE(softirq_count() == 0);
2953
77a980dc
JB		 2954 if (WARN_ON(status->band < 0 ||
2955 status->band >= IEEE80211_NUM_BANDS))
2956 goto drop;
8318d78a
JB		 2957
2958 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2959 if (WARN_ON(!sband))
2960 goto drop;
8318d78a 2961
89c3a8ac
JB		 2962 /*
2963 * If we're suspending, it is possible although not too likely
2964 * that we'd be receiving frames after having already partially
2965 * quiesced the stack. We can't process such frames then since
2966 * that might, for example, cause stations to be added or other
2967 * driver callbacks be invoked.
2968 */
77a980dc
JB		 2969 if (unlikely(local->quiescing || local->suspended))
2970 goto drop;
89c3a8ac 2971
ea77f12f
JB		 2972 /*
2973 * The same happens when we're not even started,
2974 * but that's worth a warning.
2975 */
77a980dc
JB		 2976 if (WARN_ON(!local->started))
2977 goto drop;
ea77f12f 2978
fc885189 2979 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2980 /*
fc885189
JB		 2981 * Validate the rate, unless a PLCP error means that
2982 * we probably can't have a valid rate here anyway.
e5d6eb83 2983 */
fc885189
JB		 2984
2985 if (status->flag & RX_FLAG_HT) {
2986 /*
2987 * rate_idx is MCS index, which can be [0-76]
2988 * as documented on:
2989 *
2990 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2991 *
2992 * Anything else would be some sort of driver or
2993 * hardware error. The driver should catch hardware
2994 * errors.
2995 */
2996 if (WARN((status->rate_idx < 0 ||
2997 status->rate_idx > 76),
2998 "Rate marked as an HT rate but passed "
2999 "status->rate_idx is not "
3000 "an MCS index [0-76]: %d (0x%02x)\n",
3001 status->rate_idx,
3002 status->rate_idx))
3003 goto drop;
3004 } else {
3005 if (WARN_ON(status->rate_idx < 0 ||
3006 status->rate_idx >= sband->n_bitrates))
3007 goto drop;
3008 rate = &sband->bitrates[status->rate_idx];
3009 }
0fb8ca45 3010 }
6368e4b1 3011
554891e6
JB		 3012 status->rx_flags = 0;
3013
6368e4b1
RR		 3014 /*
3015 * key references and virtual interfaces are protected using RCU
3016 * and this requires that we are in a read-side RCU section during
3017 * receive processing
3018 */
3019 rcu_read_lock();
3020
3021 /*
3022 * Frames with failed FCS/PLCP checksum are not returned,
3023 * all other frames are returned without radiotap header
3024 * if it was previously present.
3025 * Also, frames with less than 16 bytes are dropped.
3026 */
f1d58c25 3027 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3028 if (!skb) {
3029 rcu_read_unlock();
3030 return;
3031 }
3032
e1e54068
JB		 3033 ieee80211_tpt_led_trig_rx(local,
3034 ((struct ieee80211_hdr *)skb->data)->frame_control,
3035 skb->len);
071d9ac2 3036 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3037
3038 rcu_read_unlock();
77a980dc
JB		 3039
3040 return;
3041 drop:
3042 kfree_skb(skb);
6368e4b1 3043}
103bf9f7 3044EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3045
3046/* This is a version of the rx handler that can be called from hard irq
3047 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3048void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3049{
3050 struct ieee80211_local *local = hw_to_local(hw);
3051
3052 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3053
571ecf67
JB		 3054 skb->pkt_type = IEEE80211_RX_MSG;
3055 skb_queue_tail(&local->skb_queue, skb);
3056 tasklet_schedule(&local->tasklet);
3057}
3058EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)