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mac80211: fix retransmit
[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 */
f8d1ccf1 144 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 145 /*
f8d1ccf1 146 * Without rate information don't add it. If we have,
38f37be2 147 * MCS information is a separate field in radiotap,
73b48099
JB		 148 * added below. The byte here is needed as padding
149 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 150 */
151 *pos = 0;
8d6f658e 152 } else {
ebe6c7ba 153 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 154 *pos = rate->bitrate / 5;
8d6f658e 155 }
601ae7f2
BR		 156 pos++;
157
158 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 159 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 160 pos += 2;
161 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 162 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
163 pos);
5f0b7de5
JB		 164 else if (status->flag & RX_FLAG_HT)
165 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
166 pos);
f8d1ccf1 167 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 pos);
f8d1ccf1 170 else if (rate)
6a86b9c7
JB		 171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 pos);
f8d1ccf1
JB		 173 else
174 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 175 pos += 2;
176
177 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
178 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
179 *pos = status->signal;
180 rthdr->it_present |=
181 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
182 pos++;
183 }
184
601ae7f2
BR		 185 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
186
187 /* IEEE80211_RADIOTAP_ANTENNA */
188 *pos = status->antenna;
189 pos++;
190
601ae7f2
BR		 191 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
192
193 /* IEEE80211_RADIOTAP_RX_FLAGS */
194 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 195 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 196 pos++;
aae89831 197 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 198 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
199 put_unaligned_le16(rx_flags, pos);
601ae7f2 200 pos += 2;
6d744bac
JB		 201
202 if (status->flag & RX_FLAG_HT) {
203 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
204 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
205 IEEE80211_RADIOTAP_MCS_HAVE_GI |
206 IEEE80211_RADIOTAP_MCS_HAVE_BW;
207 *pos = 0;
208 if (status->flag & RX_FLAG_SHORT_GI)
209 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
210 if (status->flag & RX_FLAG_40MHZ)
211 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
212 pos++;
213 *pos++ = status->rate_idx;
214 }
601ae7f2
BR		 215}
216
b2e7771e
JB		 217/*
218 * This function copies a received frame to all monitor interfaces and
219 * returns a cleaned-up SKB that no longer includes the FCS nor the
220 * radiotap header the driver might have added.
221 */
222static struct sk_buff *
223ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 224 struct ieee80211_rate *rate)
b2e7771e 225{
f1d58c25 226 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 227 struct ieee80211_sub_if_data *sdata;
b2e7771e 228 int needed_headroom = 0;
b2e7771e
JB		 229 struct sk_buff *skb, *skb2;
230 struct net_device *prev_dev = NULL;
231 int present_fcs_len = 0;
b2e7771e
JB		 232
233 /*
234 * First, we may need to make a copy of the skb because
235 * (1) we need to modify it for radiotap (if not present), and
236 * (2) the other RX handlers will modify the skb we got.
237 *
238 * We don't need to, of course, if we aren't going to return
239 * the SKB because it has a bad FCS/PLCP checksum.
240 */
0869aea0
JB		 241
242 /* room for the radiotap header based on driver features */
243 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 244
245 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
246 present_fcs_len = FCS_LEN;
247
e3cf8b3f
ZY		 248 /* make sure hdr->frame_control is on the linear part */
249 if (!pskb_may_pull(origskb, 2)) {
250 dev_kfree_skb(origskb);
251 return NULL;
252 }
253
b2e7771e 254 if (!local->monitors) {
0869aea0 255 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 256 dev_kfree_skb(origskb);
257 return NULL;
258 }
259
0869aea0 260 return remove_monitor_info(local, origskb);
b2e7771e
JB		 261 }
262
0869aea0 263 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 264 /* only need to expand headroom if necessary */
265 skb = origskb;
266 origskb = NULL;
267
268 /*
269 * This shouldn't trigger often because most devices have an
270 * RX header they pull before we get here, and that should
271 * be big enough for our radiotap information. We should
272 * probably export the length to drivers so that we can have
273 * them allocate enough headroom to start with.
274 */
275 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 276 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 277 dev_kfree_skb(skb);
278 return NULL;
279 }
280 } else {
281 /*
282 * Need to make a copy and possibly remove radiotap header
283 * and FCS from the original.
284 */
285 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
286
0869aea0 287 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 288
289 if (!skb)
290 return origskb;
291 }
292
0869aea0
JB		 293 /* prepend radiotap information */
294 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 295
ce3edf6d 296 skb_reset_mac_header(skb);
b2e7771e
JB		 297 skb->ip_summed = CHECKSUM_UNNECESSARY;
298 skb->pkt_type = PACKET_OTHERHOST;
299 skb->protocol = htons(ETH_P_802_2);
300
301 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 303 continue;
304
3d30d949
MW		 305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
306 continue;
307
9607e6b6 308 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 309 continue;
310
b2e7771e
JB		 311 if (prev_dev) {
312 skb2 = skb_clone(skb, GFP_ATOMIC);
313 if (skb2) {
314 skb2->dev = prev_dev;
5548a8a1 315 netif_receive_skb(skb2);
b2e7771e
JB		 316 }
317 }
318
319 prev_dev = sdata->dev;
320 sdata->dev->stats.rx_packets++;
321 sdata->dev->stats.rx_bytes += skb->len;
322 }
323
324 if (prev_dev) {
325 skb->dev = prev_dev;
5548a8a1 326 netif_receive_skb(skb);
b2e7771e
JB		 327 } else
328 dev_kfree_skb(skb);
329
330 return origskb;
331}
332
333
5cf121c3 334static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 335{
238f74a2 336 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 337 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 338 int tid, seqno_idx, security_idx;
6e0d114d
JB		 339
340 /* does the frame have a qos control field? */
238f74a2
HH		 341 if (ieee80211_is_data_qos(hdr->frame_control)) {
342 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 343 /* frame has qos control */
238f74a2 344 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 345 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 346 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 347
348 seqno_idx = tid;
349 security_idx = tid;
6e0d114d 350 } else {
1411f9b5
JB		 351 /*
352 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
353 *
354 * Sequence numbers for management frames, QoS data
355 * frames with a broadcast/multicast address in the
356 * Address 1 field, and all non-QoS data frames sent
357 * by QoS STAs are assigned using an additional single
358 * modulo-4096 counter, [...]
359 *
360 * We also use that counter for non-QoS STAs.
361 */
9e26297a
JB		 362 seqno_idx = NUM_RX_DATA_QUEUES;
363 security_idx = 0;
364 if (ieee80211_is_mgmt(hdr->frame_control))
365 security_idx = NUM_RX_DATA_QUEUES;
366 tid = 0;
6e0d114d 367 }
52865dfd 368
9e26297a
JB		 369 rx->seqno_idx = seqno_idx;
370 rx->security_idx = security_idx;
6e0d114d
JB		 371 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
372 * For now, set skb->priority to 0 for other cases. */
373 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 374}
6e0d114d 375
d1c3a37c
JB		 376/**
377 * DOC: Packet alignment
378 *
379 * Drivers always need to pass packets that are aligned to two-byte boundaries
380 * to the stack.
381 *
382 * Additionally, should, if possible, align the payload data in a way that
383 * guarantees that the contained IP header is aligned to a four-byte
384 * boundary. In the case of regular frames, this simply means aligning the
385 * payload to a four-byte boundary (because either the IP header is directly
386 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 387 * in front of it). If the payload data is not properly aligned and the
388 * architecture doesn't support efficient unaligned operations, mac80211
389 * will align the data.
d1c3a37c
JB		 390 *
391 * With A-MSDU frames, however, the payload data address must yield two modulo
392 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
393 * push the IP header further back to a multiple of four again. Thankfully, the
394 * specs were sane enough this time around to require padding each A-MSDU
395 * subframe to a length that is a multiple of four.
396 *
25985edc 397 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 398 * the payload is not supported, the driver is required to move the 802.11
399 * header to be directly in front of the payload in that case.
400 */
401static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 402{
59d9cb07
KV		 403#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
404 WARN_ONCE((unsigned long)rx->skb->data & 1,
405 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 406#endif
6e0d114d
JB		 407}
408
6368e4b1 409
571ecf67
JB		 410/* rx handlers */
411
49461622 412static ieee80211_rx_result debug_noinline
5cf121c3 413ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 414{
415 struct ieee80211_local *local = rx->local;
554891e6 416 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 417 struct sk_buff *skb = rx->skb;
418
79f460ca
LC		 419 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
420 !local->sched_scanning))
4080c7cd
JB		 421 return RX_CONTINUE;
422
b23b025f 423 if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
79f460ca
LC		 424 test_bit(SCAN_SW_SCANNING, &local->scanning) ||
425 local->sched_scanning)
f1d58c25 426 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 427
4080c7cd
JB		 428 /* scanning finished during invoking of handlers */
429 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
430 return RX_DROP_UNUSABLE;
571ecf67
JB		 431}
432
3cfcf6ac
JM		 433
434static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
435{
436 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
437
438 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
439 return 0;
440
441 return ieee80211_is_robust_mgmt_frame(hdr);
442}
443
444
445static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
446{
447 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
448
449 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
450 return 0;
451
452 return ieee80211_is_robust_mgmt_frame(hdr);
453}
454
455
456/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
457static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
458{
459 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
460 struct ieee80211_mmie *mmie;
461
462 if (skb->len < 24 + sizeof(*mmie) ||
463 !is_multicast_ether_addr(hdr->da))
464 return -1;
465
466 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
467 return -1; /* not a robust management frame */
468
469 mmie = (struct ieee80211_mmie *)
470 (skb->data + skb->len - sizeof(*mmie));
471 if (mmie->element_id != WLAN_EID_MMIE ||
472 mmie->length != sizeof(*mmie) - 2)
473 return -1;
474
475 return le16_to_cpu(mmie->key_id);
476}
477
478
33b64eb2 479static ieee80211_rx_result
5cf121c3 480ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 481{
a7767f95 482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 483 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 484
a7767f95 485 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 486 if (is_multicast_ether_addr(hdr->addr1)) {
487 if (ieee80211_has_tods(hdr->frame_control) ||
488 !ieee80211_has_fromds(hdr->frame_control))
489 return RX_DROP_MONITOR;
490 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
491 return RX_DROP_MONITOR;
492 } else {
493 if (!ieee80211_has_a4(hdr->frame_control))
494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
497 }
33b64eb2
LCC		 498 }
499
500 /* If there is not an established peer link and this is not a peer link
501 * establisment frame, beacon or probe, drop the frame.
502 */
503
57cf8043 504 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 505 struct ieee80211_mgmt *mgmt;
d6d1a5a7 506
a7767f95 507 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 508 return RX_DROP_MONITOR;
509
a7767f95 510 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 511 u8 category;
33b64eb2 512 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 513 category = mgmt->u.action.category;
514 if (category != WLAN_CATEGORY_MESH_ACTION &&
515 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 516 return RX_DROP_MONITOR;
33b64eb2 517 return RX_CONTINUE;
33b64eb2
LCC		 518 }
519
a7767f95
HH		 520 if (ieee80211_is_probe_req(hdr->frame_control) ||
521 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 522 ieee80211_is_beacon(hdr->frame_control) ||
523 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 524 return RX_CONTINUE;
525
526 return RX_DROP_MONITOR;
527
528 }
529
902acc78
JB		 530 return RX_CONTINUE;
531}
33b64eb2 532
1edfb1af
JB		 533#define SEQ_MODULO 0x1000
534#define SEQ_MASK 0xfff
535
536static inline int seq_less(u16 sq1, u16 sq2)
537{
538 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
539}
540
541static inline u16 seq_inc(u16 sq)
542{
543 return (sq + 1) & SEQ_MASK;
544}
545
546static inline u16 seq_sub(u16 sq1, u16 sq2)
547{
548 return (sq1 - sq2) & SEQ_MASK;
549}
550
551
552static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
553 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 554 int index)
1edfb1af 555{
24a8fdad 556 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 557 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 558 struct ieee80211_rx_status *status;
1edfb1af 559
dd318575
JB		 560 lockdep_assert_held(&tid_agg_rx->reorder_lock);
561
1edfb1af
JB		 562 if (!skb)
563 goto no_frame;
564
071d9ac2 565 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 566 tid_agg_rx->stored_mpdu_num--;
567 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 568 status = IEEE80211_SKB_RXCB(skb);
569 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 570 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 571
572no_frame:
573 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
574}
575
576static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
577 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 578 u16 head_seq_num)
1edfb1af
JB		 579{
580 int index;
581
dd318575
JB		 582 lockdep_assert_held(&tid_agg_rx->reorder_lock);
583
1edfb1af
JB		 584 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
585 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
586 tid_agg_rx->buf_size;
24a8fdad 587 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 588 }
589}
590
591/*
592 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
593 * the skb was added to the buffer longer than this time ago, the earlier
594 * frames that have not yet been received are assumed to be lost and the skb
595 * can be released for processing. This may also release other skb's from the
596 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 597 *
598 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 599 */
600#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
601
aa0c8636 602static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 603 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 604{
2bff8ebf 605 int index, j;
aa0c8636 606
dd318575
JB		 607 lockdep_assert_held(&tid_agg_rx->reorder_lock);
608
aa0c8636
CL		 609 /* release the buffer until next missing frame */
610 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
611 tid_agg_rx->buf_size;
612 if (!tid_agg_rx->reorder_buf[index] &&
613 tid_agg_rx->stored_mpdu_num > 1) {
614 /*
615 * No buffers ready to be released, but check whether any
616 * frames in the reorder buffer have timed out.
617 */
aa0c8636
CL		 618 int skipped = 1;
619 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
620 j = (j + 1) % tid_agg_rx->buf_size) {
621 if (!tid_agg_rx->reorder_buf[j]) {
622 skipped++;
623 continue;
624 }
499fe9a4
DH		 625 if (skipped &&
626 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 627 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 628 goto set_release_timer;
aa0c8636
CL		 629
630#ifdef CONFIG_MAC80211_HT_DEBUG
631 if (net_ratelimit())
0fb9a9ec
JP		 632 wiphy_debug(hw->wiphy,
633 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 634#endif
24a8fdad 635 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 636
637 /*
638 * Increment the head seq# also for the skipped slots.
639 */
640 tid_agg_rx->head_seq_num =
641 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
642 skipped = 0;
643 }
644 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 645 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 646 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
647 tid_agg_rx->buf_size;
648 }
2bff8ebf
CL		 649
650 if (tid_agg_rx->stored_mpdu_num) {
651 j = index = seq_sub(tid_agg_rx->head_seq_num,
652 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
653
654 for (; j != (index - 1) % tid_agg_rx->buf_size;
655 j = (j + 1) % tid_agg_rx->buf_size) {
656 if (tid_agg_rx->reorder_buf[j])
657 break;
658 }
659
660 set_release_timer:
661
662 mod_timer(&tid_agg_rx->reorder_timer,
334df731 663 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 664 HT_RX_REORDER_BUF_TIMEOUT);
665 } else {
666 del_timer(&tid_agg_rx->reorder_timer);
667 }
aa0c8636
CL		 668}
669
1edfb1af
JB		 670/*
671 * As this function belongs to the RX path it must be under
672 * rcu_read_lock protection. It returns false if the frame
673 * can be processed immediately, true if it was consumed.
674 */
675static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
676 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 677 struct sk_buff *skb)
1edfb1af
JB		 678{
679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
680 u16 sc = le16_to_cpu(hdr->seq_ctrl);
681 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
682 u16 head_seq_num, buf_size;
683 int index;
2bff8ebf 684 bool ret = true;
1edfb1af 685
dd318575
JB		 686 spin_lock(&tid_agg_rx->reorder_lock);
687
1edfb1af
JB		 688 buf_size = tid_agg_rx->buf_size;
689 head_seq_num = tid_agg_rx->head_seq_num;
690
691 /* frame with out of date sequence number */
692 if (seq_less(mpdu_seq_num, head_seq_num)) {
693 dev_kfree_skb(skb);
2bff8ebf 694 goto out;
1edfb1af
JB		 695 }
696
697 /*
698 * If frame the sequence number exceeds our buffering window
699 * size release some previous frames to make room for this one.
700 */
701 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
702 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
703 /* release stored frames up to new head to stack */
24a8fdad 704 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 705 }
706
707 /* Now the new frame is always in the range of the reordering buffer */
708
709 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
710
711 /* check if we already stored this frame */
712 if (tid_agg_rx->reorder_buf[index]) {
713 dev_kfree_skb(skb);
2bff8ebf 714 goto out;
1edfb1af
JB		 715 }
716
717 /*
718 * If the current MPDU is in the right order and nothing else
719 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 720 * If it is first but there's something stored, we may be able
721 * to release frames after this one.
1edfb1af
JB		 722 */
723 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
724 tid_agg_rx->stored_mpdu_num == 0) {
725 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 726 ret = false;
727 goto out;
1edfb1af
JB		 728 }
729
730 /* put the frame in the reordering buffer */
731 tid_agg_rx->reorder_buf[index] = skb;
732 tid_agg_rx->reorder_time[index] = jiffies;
733 tid_agg_rx->stored_mpdu_num++;
24a8fdad 734 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 735
2bff8ebf
CL		 736 out:
737 spin_unlock(&tid_agg_rx->reorder_lock);
738 return ret;
1edfb1af
JB		 739}
740
741/*
742 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
743 * true if the MPDU was buffered, false if it should be processed.
744 */
24a8fdad 745static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 746{
2569a826
JB		 747 struct sk_buff *skb = rx->skb;
748 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 749 struct ieee80211_hw *hw = &local->hw;
750 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 751 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 752 struct sta_info *sta = rx->sta;
1edfb1af
JB		 753 struct tid_ampdu_rx *tid_agg_rx;
754 u16 sc;
6cc00d54 755 u8 tid, ack_policy;
1edfb1af
JB		 756
757 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 758 goto dont_reorder;
1edfb1af
JB		 759
760 /*
761 * filter the QoS data rx stream according to
762 * STA/TID and check if this STA/TID is on aggregation
763 */
764
1edfb1af 765 if (!sta)
2569a826 766 goto dont_reorder;
1edfb1af 767
6cc00d54
TP		 768 ack_policy = *ieee80211_get_qos_ctl(hdr) &
769 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 770 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
771
a87f736d
JB		 772 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
773 if (!tid_agg_rx)
774 goto dont_reorder;
1edfb1af
JB		 775
776 /* qos null data frames are excluded */
777 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 778 goto dont_reorder;
1edfb1af 779
6cc00d54
TP		 780 /* not part of a BA session */
781 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
782 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
783 goto dont_reorder;
784
660c6a44
TP		 785 /* not actually part of this BA session */
786 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
787 goto dont_reorder;
788
1edfb1af
JB		 789 /* new, potentially un-ordered, ampdu frame - process it */
790
791 /* reset session timer */
792 if (tid_agg_rx->timeout)
793 mod_timer(&tid_agg_rx->session_timer,
794 TU_TO_EXP_TIME(tid_agg_rx->timeout));
795
796 /* if this mpdu is fragmented - terminate rx aggregation session */
797 sc = le16_to_cpu(hdr->seq_ctrl);
798 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 799 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 800 skb_queue_tail(&rx->sdata->skb_queue, skb);
801 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 802 return;
1edfb1af
JB		 803 }
804
a87f736d
JB		 805 /*
806 * No locking needed -- we will only ever process one
807 * RX packet at a time, and thus own tid_agg_rx. All
808 * other code manipulating it needs to (and does) make
809 * sure that we cannot get to it any more before doing
810 * anything with it.
811 */
24a8fdad 812 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 813 return;
814
815 dont_reorder:
24a8fdad 816 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 817}
33b64eb2 818
49461622 819static ieee80211_rx_result debug_noinline
5cf121c3 820ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 821{
a7767f95 822 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 823 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 824
825 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
826 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 827 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 828 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 829 hdr->seq_ctrl)) {
554891e6 830 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 831 rx->local->dot11FrameDuplicateCount++;
832 rx->sta->num_duplicates++;
833 }
b1f93314 834 return RX_DROP_UNUSABLE;
571ecf67 835 } else
9e26297a 836 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 837 }
838
571ecf67
JB		 839 if (unlikely(rx->skb->len < 16)) {
840 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 841 return RX_DROP_MONITOR;
571ecf67
JB		 842 }
843
571ecf67
JB		 844 /* Drop disallowed frame classes based on STA auth/assoc state;
845 * IEEE 802.11, Chap 5.5.
846 *
ccd7b362
JB		 847 * mac80211 filters only based on association state, i.e. it drops
848 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 849 * deauth/disassoc frames when needed. In addition, hostapd is
850 * responsible for filtering on both auth and assoc states.
851 */
33b64eb2 852
902acc78 853 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 854 return ieee80211_rx_mesh_check(rx);
33b64eb2 855
a7767f95
HH		 856 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
857 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 858 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 859 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 860 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
2a33bee2
GE		 861 if (rx->sta && rx->sta->dummy &&
862 ieee80211_is_data_present(hdr->frame_control)) {
863 u16 ethertype;
864 u8 *payload;
865
866 payload = rx->skb->data +
867 ieee80211_hdrlen(hdr->frame_control);
868 ethertype = (payload[6] << 8) | payload[7];
869 if (cpu_to_be16(ethertype) ==
870 rx->sdata->control_port_protocol)
871 return RX_CONTINUE;
872 }
21fc7560
JB		 873
874 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
875 cfg80211_rx_spurious_frame(rx->sdata->dev,
876 hdr->addr2,
877 GFP_ATOMIC))
878 return RX_DROP_UNUSABLE;
879
e4c26add 880 return RX_DROP_MONITOR;
2a33bee2 881 }
571ecf67 882
9ae54c84 883 return RX_CONTINUE;
570bd537
JB		 884}
885
886
49461622 887static ieee80211_rx_result debug_noinline
5cf121c3 888ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 889{
eb9fb5b8
JB		 890 struct sk_buff *skb = rx->skb;
891 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
892 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 893 int keyidx;
894 int hdrlen;
e4c26add 895 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 896 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 897 int mmie_keyidx = -1;
761ab470 898 __le16 fc;
570bd537 899
3017b80b
JB		 900 /*
901 * Key selection 101
902 *
3cfcf6ac 903 * There are four types of keys:
3017b80b 904 * - GTK (group keys)
3cfcf6ac 905 * - IGTK (group keys for management frames)
3017b80b
JB		 906 * - PTK (pairwise keys)
907 * - STK (station-to-station pairwise keys)
908 *
909 * When selecting a key, we have to distinguish between multicast
910 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 911 * use PTKs and STKs while the former always use GTKs and IGTKs.
912 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
913 * unicast frames can also use key indices like GTKs. Hence, if we
914 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 915 *
8dc06a1c
JB		 916 * Note that in a regular BSS, multicast frames are sent by the
917 * AP only, associated stations unicast the frame to the AP first
918 * which then multicasts it on their behalf.
919 *
3017b80b
JB		 920 * There is also a slight problem in IBSS mode: GTKs are negotiated
921 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 922 * The spec seems to expect that one negotiates the same key with
923 * every station but there's no such requirement; VLANs could be
924 * possible.
3017b80b
JB		 925 */
926
3017b80b 927 /*
1990af8d 928 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 929 * addressed to us nor a multicast frame.
930 */
554891e6 931 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 932 return RX_CONTINUE;
3017b80b 933
2569a826
JB		 934 /* start without a key */
935 rx->key = NULL;
936
d4e46a3d 937 if (rx->sta)
e31b8213 938 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 939
761ab470
JB		 940 fc = hdr->frame_control;
941
942 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 943 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
944
e31b8213
JB		 945 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
946 rx->key = sta_ptk;
dc1580dd
JB		 947 if ((status->flag & RX_FLAG_DECRYPTED) &&
948 (status->flag & RX_FLAG_IV_STRIPPED))
949 return RX_CONTINUE;
0c7c10c7 950 /* Skip decryption if the frame is not protected. */
761ab470 951 if (!ieee80211_has_protected(fc))
0c7c10c7 952 return RX_CONTINUE;
3cfcf6ac
JM		 953 } else if (mmie_keyidx >= 0) {
954 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 955 if ((status->flag & RX_FLAG_DECRYPTED) &&
956 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 957 return RX_CONTINUE;
958
959 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
960 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
961 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 962 if (rx->sta)
963 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
964 if (!rx->key)
965 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 966 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 967 /*
968 * The frame was not protected, so skip decryption. However, we
969 * need to set rx->key if there is a key that could have been
970 * used so that the frame may be dropped if encryption would
971 * have been expected.
972 */
973 struct ieee80211_key *key = NULL;
897bed8b
JB		 974 struct ieee80211_sub_if_data *sdata = rx->sdata;
975 int i;
976
761ab470 977 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 978 is_multicast_ether_addr(hdr->addr1) &&
979 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
980 rx->key = key;
897bed8b
JB		 981 else {
982 if (rx->sta) {
983 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
984 key = rcu_dereference(rx->sta->gtk[i]);
985 if (key)
986 break;
987 }
988 }
989 if (!key) {
990 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
991 key = rcu_dereference(sdata->keys[i]);
992 if (key)
993 break;
994 }
995 }
996 if (key)
997 rx->key = key;
998 }
0c7c10c7 999 return RX_CONTINUE;
571ecf67 1000 } else {
39184b15 1001 u8 keyid;
3017b80b
JB		 1002 /*
1003 * The device doesn't give us the IV so we won't be
1004 * able to look up the key. That's ok though, we
1005 * don't need to decrypt the frame, we just won't
1006 * be able to keep statistics accurate.
1007 * Except for key threshold notifications, should
1008 * we somehow allow the driver to tell us which key
1009 * the hardware used if this flag is set?
1010 */
eb9fb5b8
JB		 1011 if ((status->flag & RX_FLAG_DECRYPTED) &&
1012 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1013 return RX_CONTINUE;
3017b80b 1014
761ab470 1015 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1016
1017 if (rx->skb->len < 8 + hdrlen)
e4c26add 1018 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1019
1020 /*
1021 * no need to call ieee80211_wep_get_keyidx,
1022 * it verifies a bunch of things we've done already
1023 */
39184b15
ZY		 1024 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1025 keyidx = keyid >> 6;
3017b80b 1026
e31b8213
JB		 1027 /* check per-station GTK first, if multicast packet */
1028 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1029 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1030
e31b8213
JB		 1031 /* if not found, try default key */
1032 if (!rx->key) {
1033 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1034
1035 /*
1036 * RSNA-protected unicast frames should always be
1037 * sent with pairwise or station-to-station keys,
1038 * but for WEP we allow using a key index as well.
1039 */
1040 if (rx->key &&
1041 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1042 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1043 !is_multicast_ether_addr(hdr->addr1))
1044 rx->key = NULL;
1045 }
571ecf67
JB		 1046 }
1047
3017b80b 1048 if (rx->key) {
95acac61
JB		 1049 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1050 return RX_DROP_MONITOR;
1051
571ecf67 1052 rx->key->tx_rx_count++;
011bfcc4 1053 /* TODO: add threshold stuff again */
1990af8d 1054 } else {
e4c26add 1055 return RX_DROP_MONITOR;
70f08765
JB		 1056 }
1057
39184b15
ZY		 1058 if (skb_linearize(rx->skb))
1059 return RX_DROP_UNUSABLE;
761ab470 1060 /* the hdr variable is invalid now! */
1990af8d 1061
97359d12
JB		 1062 switch (rx->key->conf.cipher) {
1063 case WLAN_CIPHER_SUITE_WEP40:
1064 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1065 /* Check for weak IVs if possible */
1066 if (rx->sta && ieee80211_is_data(fc) &&
1067 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1068 !(status->flag & RX_FLAG_DECRYPTED)) &&
1069 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1070 rx->sta->wep_weak_iv_count++;
1071
e2f036da
MN		 1072 result = ieee80211_crypto_wep_decrypt(rx);
1073 break;
97359d12 1074 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1075 result = ieee80211_crypto_tkip_decrypt(rx);
1076 break;
97359d12 1077 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1078 result = ieee80211_crypto_ccmp_decrypt(rx);
1079 break;
97359d12 1080 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1081 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1082 break;
3ffc2a90
JB		 1083 default:
1084 /*
1085 * We can reach here only with HW-only algorithms
1086 * but why didn't it decrypt the frame?!
1087 */
1088 return RX_DROP_UNUSABLE;
70f08765
JB		 1089 }
1090
e2f036da 1091 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1092 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1093
1094 return result;
70f08765
JB		 1095}
1096
572e0012
KV		 1097static ieee80211_rx_result debug_noinline
1098ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1099{
1100 struct ieee80211_local *local;
1101 struct ieee80211_hdr *hdr;
1102 struct sk_buff *skb;
1103
1104 local = rx->local;
1105 skb = rx->skb;
1106 hdr = (struct ieee80211_hdr *) skb->data;
1107
1108 if (!local->pspolling)
1109 return RX_CONTINUE;
1110
1111 if (!ieee80211_has_fromds(hdr->frame_control))
1112 /* this is not from AP */
1113 return RX_CONTINUE;
1114
1115 if (!ieee80211_is_data(hdr->frame_control))
1116 return RX_CONTINUE;
1117
1118 if (!ieee80211_has_moredata(hdr->frame_control)) {
1119 /* AP has no more frames buffered for us */
1120 local->pspolling = false;
1121 return RX_CONTINUE;
1122 }
1123
1124 /* more data bit is set, let's request a new frame from the AP */
1125 ieee80211_send_pspoll(local, rx->sdata);
1126
1127 return RX_CONTINUE;
1128}
1129
133b8226 1130static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1131{
133b8226 1132 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1133 struct ieee80211_local *local = sdata->local;
0795af57 1134
3e122be0 1135 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1136 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1137 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1138 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1139#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1140 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1141 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1142#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1143}
1144
ff9458d3 1145static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1146{
133b8226 1147 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1148
3e122be0 1149 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1150
571ecf67 1151#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1152 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1153 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1154#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1155
c2c98fde 1156 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1157#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1158 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1159 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1160#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1161 return;
1162 }
1163
1164 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1165}
1166
d057e5a3
AN		 1167int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1168{
1169 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1170 bool in_ps;
1171
1172 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1173
1174 /* Don't let the same PS state be set twice */
c2c98fde 1175 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1176 if ((start && in_ps) || (!start && !in_ps))
1177 return -EINVAL;
1178
1179 if (start)
1180 ap_sta_ps_start(sta_inf);
1181 else
1182 ap_sta_ps_end(sta_inf);
1183
1184 return 0;
1185}
1186EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1187
47086fc5
JB		 1188static ieee80211_rx_result debug_noinline
1189ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1190{
1191 struct ieee80211_sub_if_data *sdata = rx->sdata;
1192 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1193 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1194 int tid, ac;
1195
1196 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1197 return RX_CONTINUE;
1198
1199 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1200 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1201 return RX_CONTINUE;
1202
1203 /*
1204 * The device handles station powersave, so don't do anything about
1205 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1206 * it to mac80211 since they're handled.)
1207 */
1208 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1209 return RX_CONTINUE;
1210
1211 /*
1212 * Don't do anything if the station isn't already asleep. In
1213 * the uAPSD case, the station will probably be marked asleep,
1214 * in the PS-Poll case the station must be confused ...
1215 */
c2c98fde 1216 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1217 return RX_CONTINUE;
1218
1219 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1220 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1221 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1222 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1223 else
c2c98fde 1224 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1225 }
47086fc5
JB		 1226
1227 /* Free PS Poll skb here instead of returning RX_DROP that would
1228 * count as an dropped frame. */
1229 dev_kfree_skb(rx->skb);
1230
1231 return RX_QUEUED;
1232 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1233 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1234 ieee80211_has_pm(hdr->frame_control) &&
1235 (ieee80211_is_data_qos(hdr->frame_control) ||
1236 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1237 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1238 ac = ieee802_1d_to_ac[tid & 7];
1239
1240 /*
1241 * If this AC is not trigger-enabled do nothing.
1242 *
1243 * NB: This could/should check a separate bitmap of trigger-
1244 * enabled queues, but for now we only implement uAPSD w/o
1245 * TSPEC changes to the ACs, so they're always the same.
1246 */
1247 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1248 return RX_CONTINUE;
1249
1250 /* if we are in a service period, do nothing */
c2c98fde 1251 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1252 return RX_CONTINUE;
1253
c2c98fde 1254 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1255 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1256 else
c2c98fde 1257 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1258 }
1259
1260 return RX_CONTINUE;
1261}
1262
49461622 1263static ieee80211_rx_result debug_noinline
5cf121c3 1264ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1265{
1266 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1267 struct sk_buff *skb = rx->skb;
1268 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1269 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1270
1271 if (!sta)
9ae54c84 1272 return RX_CONTINUE;
571ecf67 1273
b291ba11
JB		 1274 /*
1275 * Update last_rx only for IBSS packets which are for the current
1276 * BSSID to avoid keeping the current IBSS network alive in cases
1277 * where other STAs start using different BSSID.
1278 */
05c914fe 1279 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1280 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1281 NL80211_IFTYPE_ADHOC);
3af6334c 1282 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) {
571ecf67 1283 sta->last_rx = jiffies;
3af6334c
FF		 1284 if (ieee80211_is_data(hdr->frame_control)) {
1285 sta->last_rx_rate_idx = status->rate_idx;
1286 sta->last_rx_rate_flag = status->flag;
1287 }
1288 }
b291ba11
JB		 1289 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1290 /*
33b64eb2
LCC		 1291 * Mesh beacons will update last_rx when if they are found to
1292 * match the current local configuration when processed.
571ecf67 1293 */
b291ba11 1294 sta->last_rx = jiffies;
3af6334c
FF		 1295 if (ieee80211_is_data(hdr->frame_control)) {
1296 sta->last_rx_rate_idx = status->rate_idx;
1297 sta->last_rx_rate_flag = status->flag;
1298 }
571ecf67
JB		 1299 }
1300
554891e6 1301 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1302 return RX_CONTINUE;
571ecf67 1303
3cf335d5
KV		 1304 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1305 ieee80211_sta_rx_notify(rx->sdata, hdr);
1306
571ecf67
JB		 1307 sta->rx_fragments++;
1308 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1309 sta->last_signal = status->signal;
541a45a1 1310 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1311
72eaa43a
JB		 1312 /*
1313 * Change STA power saving mode only at the end of a frame
1314 * exchange sequence.
1315 */
d057e5a3
AN		 1316 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1317 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1318 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1319 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1320 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1321 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1322 /*
1323 * Ignore doze->wake transitions that are
1324 * indicated by non-data frames, the standard
1325 * is unclear here, but for example going to
1326 * PS mode and then scanning would cause a
1327 * doze->wake transition for the probe request,
1328 * and that is clearly undesirable.
1329 */
1330 if (ieee80211_is_data(hdr->frame_control) &&
1331 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1332 ap_sta_ps_end(sta);
72eaa43a
JB		 1333 } else {
1334 if (ieee80211_has_pm(hdr->frame_control))
1335 ap_sta_ps_start(sta);
1336 }
571ecf67
JB		 1337 }
1338
22403def
JB		 1339 /*
1340 * Drop (qos-)data::nullfunc frames silently, since they
1341 * are used only to control station power saving mode.
1342 */
1343 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1344 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1345 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1346
1347 /*
1348 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1349 * that was not moved to a 4-addr STA vlan yet send
1350 * the event to userspace and for older hostapd drop
1351 * the frame to the monitor interface.
d524215f
FF		 1352 */
1353 if (ieee80211_has_a4(hdr->frame_control) &&
1354 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1355 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1356 !rx->sdata->u.vlan.sta))) {
1357 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1358 cfg80211_rx_unexpected_4addr_frame(
1359 rx->sdata->dev, sta->sta.addr,
1360 GFP_ATOMIC);
d524215f 1361 return RX_DROP_MONITOR;
e7f4a940 1362 }
22403def
JB		 1363 /*
1364 * Update counter and free packet here to avoid
1365 * counting this as a dropped packed.
1366 */
571ecf67
JB		 1367 sta->rx_packets++;
1368 dev_kfree_skb(rx->skb);
9ae54c84 1369 return RX_QUEUED;
571ecf67
JB		 1370 }
1371
9ae54c84 1372 return RX_CONTINUE;
571ecf67
JB		 1373} /* ieee80211_rx_h_sta_process */
1374
571ecf67
JB		 1375static inline struct ieee80211_fragment_entry *
1376ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1377 unsigned int frag, unsigned int seq, int rx_queue,
1378 struct sk_buff **skb)
1379{
1380 struct ieee80211_fragment_entry *entry;
1381 int idx;
1382
1383 idx = sdata->fragment_next;
1384 entry = &sdata->fragments[sdata->fragment_next++];
1385 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1386 sdata->fragment_next = 0;
1387
1388 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1389#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1390 struct ieee80211_hdr *hdr =
1391 (struct ieee80211_hdr *) entry->skb_list.next->data;
1392 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1393 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1394 "addr1=%pM addr2=%pM\n",
47846c9b 1395 sdata->name, idx,
571ecf67 1396 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1397 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1398#endif
571ecf67
JB		 1399 __skb_queue_purge(&entry->skb_list);
1400 }
1401
1402 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1403 *skb = NULL;
1404 entry->first_frag_time = jiffies;
1405 entry->seq = seq;
1406 entry->rx_queue = rx_queue;
1407 entry->last_frag = frag;
1408 entry->ccmp = 0;
1409 entry->extra_len = 0;
1410
1411 return entry;
1412}
1413
1414static inline struct ieee80211_fragment_entry *
1415ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1416 unsigned int frag, unsigned int seq,
571ecf67
JB		 1417 int rx_queue, struct ieee80211_hdr *hdr)
1418{
1419 struct ieee80211_fragment_entry *entry;
1420 int i, idx;
1421
1422 idx = sdata->fragment_next;
1423 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1424 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1425
1426 idx--;
1427 if (idx < 0)
1428 idx = IEEE80211_FRAGMENT_MAX - 1;
1429
1430 entry = &sdata->fragments[idx];
1431 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1432 entry->rx_queue != rx_queue ||
1433 entry->last_frag + 1 != frag)
1434 continue;
1435
b73d70ad 1436 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1437
b73d70ad
HH		 1438 /*
1439 * Check ftype and addresses are equal, else check next fragment
1440 */
1441 if (((hdr->frame_control ^ f_hdr->frame_control) &
1442 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1443 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1444 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1445 continue;
1446
ab46623e 1447 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1448 __skb_queue_purge(&entry->skb_list);
1449 continue;
1450 }
1451 return entry;
1452 }
1453
1454 return NULL;
1455}
1456
49461622 1457static ieee80211_rx_result debug_noinline
5cf121c3 1458ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1459{
1460 struct ieee80211_hdr *hdr;
1461 u16 sc;
358c8d9d 1462 __le16 fc;
571ecf67
JB		 1463 unsigned int frag, seq;
1464 struct ieee80211_fragment_entry *entry;
1465 struct sk_buff *skb;
554891e6 1466 struct ieee80211_rx_status *status;
571ecf67 1467
b73d70ad 1468 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1469 fc = hdr->frame_control;
571ecf67
JB		 1470 sc = le16_to_cpu(hdr->seq_ctrl);
1471 frag = sc & IEEE80211_SCTL_FRAG;
1472
358c8d9d 1473 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1474 (rx->skb)->len < 24 ||
1475 is_multicast_ether_addr(hdr->addr1))) {
1476 /* not fragmented */
1477 goto out;
1478 }
1479 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1480
e3cf8b3f
ZY		 1481 if (skb_linearize(rx->skb))
1482 return RX_DROP_UNUSABLE;
1483
058897a4
AK		 1484 /*
1485 * skb_linearize() might change the skb->data and
1486 * previously cached variables (in this case, hdr) need to
1487 * be refreshed with the new data.
1488 */
1489 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1490 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1491
1492 if (frag == 0) {
1493 /* This is the first fragment of a new frame. */
1494 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1495 rx->seqno_idx, &(rx->skb));
97359d12 1496 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1497 ieee80211_has_protected(fc)) {
9e26297a 1498 int queue = rx->security_idx;
571ecf67
JB		 1499 /* Store CCMP PN so that we can verify that the next
1500 * fragment has a sequential PN value. */
1501 entry->ccmp = 1;
1502 memcpy(entry->last_pn,
9190252c 1503 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1504 CCMP_PN_LEN);
1505 }
9ae54c84 1506 return RX_QUEUED;
571ecf67
JB		 1507 }
1508
1509 /* This is a fragment for a frame that should already be pending in
1510 * fragment cache. Add this fragment to the end of the pending entry.
1511 */
9e26297a
JB		 1512 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1513 rx->seqno_idx, hdr);
571ecf67
JB		 1514 if (!entry) {
1515 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1516 return RX_DROP_MONITOR;
571ecf67
JB		 1517 }
1518
1519 /* Verify that MPDUs within one MSDU have sequential PN values.
1520 * (IEEE 802.11i, 8.3.3.4.5) */
1521 if (entry->ccmp) {
1522 int i;
1523 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1524 int queue;
97359d12 1525 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1526 return RX_DROP_UNUSABLE;
571ecf67
JB		 1527 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1528 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1529 pn[i]++;
1530 if (pn[i])
1531 break;
1532 }
9e26297a 1533 queue = rx->security_idx;
9190252c 1534 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1535 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1536 return RX_DROP_UNUSABLE;
571ecf67
JB		 1537 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1538 }
1539
358c8d9d 1540 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1541 __skb_queue_tail(&entry->skb_list, rx->skb);
1542 entry->last_frag = frag;
1543 entry->extra_len += rx->skb->len;
358c8d9d 1544 if (ieee80211_has_morefrags(fc)) {
571ecf67 1545 rx->skb = NULL;
9ae54c84 1546 return RX_QUEUED;
571ecf67
JB		 1547 }
1548
1549 rx->skb = __skb_dequeue(&entry->skb_list);
1550 if (skb_tailroom(rx->skb) < entry->extra_len) {
1551 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1552 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1553 GFP_ATOMIC))) {
1554 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1555 __skb_queue_purge(&entry->skb_list);
e4c26add 1556 return RX_DROP_UNUSABLE;
571ecf67
JB		 1557 }
1558 }
1559 while ((skb = __skb_dequeue(&entry->skb_list))) {
1560 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1561 dev_kfree_skb(skb);
1562 }
1563
1564 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1565 status = IEEE80211_SKB_RXCB(rx->skb);
1566 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1567
1568 out:
1569 if (rx->sta)
1570 rx->sta->rx_packets++;
1571 if (is_multicast_ether_addr(hdr->addr1))
1572 rx->local->dot11MulticastReceivedFrameCount++;
1573 else
1574 ieee80211_led_rx(rx->local);
9ae54c84 1575 return RX_CONTINUE;
571ecf67
JB		 1576}
1577
49461622 1578static ieee80211_rx_result debug_noinline
5cf121c3 1579ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1580{
6e0d114d 1581 u8 *data = rx->skb->data;
238f74a2 1582 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1583
238f74a2 1584 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1585 return RX_CONTINUE;
6e0d114d
JB		 1586
1587 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1588 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1589 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1590 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1591 /* change frame type to non QOS */
238f74a2 1592 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1593
9ae54c84 1594 return RX_CONTINUE;
6e0d114d
JB		 1595}
1596
76ee65bf 1597static int
5cf121c3 1598ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1599{
07346f81 1600 if (unlikely(!rx->sta ||
c2c98fde 1601 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1602 return -EACCES;
571ecf67 1603
76ee65bf 1604 return 0;
571ecf67
JB		 1605}
1606
76ee65bf 1607static int
358c8d9d 1608ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1609{
eb9fb5b8
JB		 1610 struct sk_buff *skb = rx->skb;
1611 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1612
3017b80b 1613 /*
7848ba7d
JB		 1614 * Pass through unencrypted frames if the hardware has
1615 * decrypted them already.
3017b80b 1616 */
eb9fb5b8 1617 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1618 return 0;
571ecf67
JB		 1619
1620 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1621 if (unlikely(!ieee80211_has_protected(fc) &&
1622 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1623 ieee80211_is_data(fc) &&
b3fc9c6c 1624 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1625 return -EACCES;
bef5d1c7
JB		 1626
1627 return 0;
1628}
1629
1630static int
1631ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1632{
1633 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1634 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1635 __le16 fc = hdr->frame_control;
bef5d1c7 1636
e3efca0a
JM		 1637 /*
1638 * Pass through unencrypted frames if the hardware has
1639 * decrypted them already.
1640 */
1641 if (status->flag & RX_FLAG_DECRYPTED)
1642 return 0;
bef5d1c7 1643
c2c98fde 1644 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1645 if (unlikely(!ieee80211_has_protected(fc) &&
1646 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1647 rx->key)) {
1648 if (ieee80211_is_deauth(fc))
1649 cfg80211_send_unprot_deauth(rx->sdata->dev,
1650 rx->skb->data,
1651 rx->skb->len);
1652 else if (ieee80211_is_disassoc(fc))
1653 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1654 rx->skb->data,
1655 rx->skb->len);
f2ca3ea4 1656 return -EACCES;
cf4e594e 1657 }
f2ca3ea4 1658 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1659 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1660 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1661 if (ieee80211_is_deauth(fc))
1662 cfg80211_send_unprot_deauth(rx->sdata->dev,
1663 rx->skb->data,
1664 rx->skb->len);
1665 else if (ieee80211_is_disassoc(fc))
1666 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1667 rx->skb->data,
1668 rx->skb->len);
f2ca3ea4 1669 return -EACCES;
cf4e594e 1670 }
f2ca3ea4
JM		 1671 /*
1672 * When using MFP, Action frames are not allowed prior to
1673 * having configured keys.
1674 */
1675 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1676 ieee80211_is_robust_mgmt_frame(
1677 (struct ieee80211_hdr *) rx->skb->data)))
1678 return -EACCES;
1679 }
b3fc9c6c 1680
76ee65bf 1681 return 0;
571ecf67
JB		 1682}
1683
76ee65bf 1684static int
4114fa21 1685__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1686{
eb9fb5b8 1687 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1688 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1689 bool check_port_control = false;
1690 struct ethhdr *ehdr;
1691 int ret;
f14543ee 1692
4114fa21 1693 *port_control = false;
9bc383de
JB		 1694 if (ieee80211_has_a4(hdr->frame_control) &&
1695 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1696 return -1;
9bc383de 1697
fbb327c5
FF		 1698 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1699 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1700
1701 if (!sdata->u.mgd.use_4addr)
1702 return -1;
1703 else
1704 check_port_control = true;
1705 }
1706
9bc383de 1707 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1708 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1709 return -1;
571ecf67 1710
fbb327c5 1711 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1712 if (ret < 0)
fbb327c5
FF		 1713 return ret;
1714
1715 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1716 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1717 *port_control = true;
1718 else if (check_port_control)
fbb327c5
FF		 1719 return -1;
1720
1721 return 0;
76ee65bf 1722}
571ecf67 1723
ce3edf6d
JB		 1724/*
1725 * requires that rx->skb is a frame with ethernet header
1726 */
358c8d9d 1727static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1728{
c97c23e3 1729 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1730 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1731 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1732
1733 /*
1734 * Allow EAPOL frames to us/the PAE group address regardless
1735 * of whether the frame was encrypted or not.
1736 */
a621fa4d 1737 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1738 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1739 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1740 return true;
1741
1742 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1743 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1744 return false;
1745
1746 return true;
1747}
1748
1749/*
1750 * requires that rx->skb is a frame with ethernet header
1751 */
76ee65bf 1752static void
5cf121c3 1753ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1754{
eb9fb5b8
JB		 1755 struct ieee80211_sub_if_data *sdata = rx->sdata;
1756 struct net_device *dev = sdata->dev;
76ee65bf 1757 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1758 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1759 struct sta_info *dsta;
554891e6 1760 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1761
76ee65bf
RR		 1762 skb = rx->skb;
1763 xmit_skb = NULL;
571ecf67 1764
05c914fe
JB		 1765 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1766 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1767 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1768 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1769 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1770 if (is_multicast_ether_addr(ehdr->h_dest)) {
1771 /*
1772 * send multicast frames both to higher layers in
1773 * local net stack and back to the wireless medium
1774 */
76ee65bf
RR		 1775 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1776 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1777 printk(KERN_DEBUG "%s: failed to clone "
1778 "multicast frame\n", dev->name);
1779 } else {
abe60632
JB		 1780 dsta = sta_info_get(sdata, skb->data);
1781 if (dsta) {
ce3edf6d
JB		 1782 /*
1783 * The destination station is associated to
1784 * this AP (in this VLAN), so send the frame
1785 * directly to it and do not pass it to local
1786 * net stack.
571ecf67 1787 */
76ee65bf 1788 xmit_skb = skb;
571ecf67
JB		 1789 skb = NULL;
1790 }
571ecf67
JB		 1791 }
1792 }
1793
1794 if (skb) {
d1c3a37c
JB		 1795 int align __maybe_unused;
1796
59d9cb07 1797#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1798 /*
1799 * 'align' will only take the values 0 or 2 here
1800 * since all frames are required to be aligned
1801 * to 2-byte boundaries when being passed to
1802 * mac80211. That also explains the __skb_push()
1803 * below.
1804 */
dacb6f1d 1805 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1806 if (align) {
1807 if (WARN_ON(skb_headroom(skb) < 3)) {
1808 dev_kfree_skb(skb);
1809 skb = NULL;
1810 } else {
1811 u8 *data = skb->data;
8ce0b589
ZY		 1812 size_t len = skb_headlen(skb);
1813 skb->data -= align;
1814 memmove(skb->data, data, len);
1815 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1816 }
1817 }
1818#endif
1819
1820 if (skb) {
1821 /* deliver to local stack */
1822 skb->protocol = eth_type_trans(skb, dev);
1823 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1824 netif_receive_skb(skb);
d1c3a37c 1825 }
571ecf67
JB		 1826 }
1827
76ee65bf 1828 if (xmit_skb) {
571ecf67 1829 /* send to wireless media */
f831e909 1830 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1831 skb_reset_network_header(xmit_skb);
1832 skb_reset_mac_header(xmit_skb);
76ee65bf 1833 dev_queue_xmit(xmit_skb);
571ecf67 1834 }
76ee65bf
RR		 1835}
1836
49461622 1837static ieee80211_rx_result debug_noinline
5cf121c3 1838ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1839{
eb9fb5b8 1840 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1841 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1842 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1843 __le16 fc = hdr->frame_control;
eaf85ca7 1844 struct sk_buff_head frame_list;
554891e6 1845 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1846
358c8d9d 1847 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1848 return RX_CONTINUE;
fd4c7f2f 1849
358c8d9d 1850 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1851 return RX_DROP_MONITOR;
fd4c7f2f 1852
554891e6 1853 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1854 return RX_CONTINUE;
fd4c7f2f 1855
eaf85ca7
ZY		 1856 if (ieee80211_has_a4(hdr->frame_control) &&
1857 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1858 !rx->sdata->u.vlan.sta)
e4c26add 1859 return RX_DROP_UNUSABLE;
fd4c7f2f 1860
eaf85ca7
ZY		 1861 if (is_multicast_ether_addr(hdr->addr1) &&
1862 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1863 rx->sdata->u.vlan.sta) ||
1864 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1865 rx->sdata->u.mgd.use_4addr)))
e4c26add 1866 return RX_DROP_UNUSABLE;
fd4c7f2f 1867
eaf85ca7
ZY		 1868 skb->dev = dev;
1869 __skb_queue_head_init(&frame_list);
fd4c7f2f 1870
e3cf8b3f
ZY		 1871 if (skb_linearize(skb))
1872 return RX_DROP_UNUSABLE;
1873
eaf85ca7
ZY		 1874 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1875 rx->sdata->vif.type,
8b3becad 1876 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1877
eaf85ca7
ZY		 1878 while (!skb_queue_empty(&frame_list)) {
1879 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1880
358c8d9d 1881 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1882 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1883 continue;
1884 }
eaf85ca7
ZY		 1885 dev->stats.rx_packets++;
1886 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1887
1888 ieee80211_deliver_skb(rx);
1889 }
1890
9ae54c84 1891 return RX_QUEUED;
fd4c7f2f
RR		 1892}
1893
bf94e17b 1894#ifdef CONFIG_MAC80211_MESH
b0dee578 1895static ieee80211_rx_result
e32f85f7
LCC		 1896ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1897{
30789eb6
TP		 1898 struct ieee80211_hdr *fwd_hdr, *hdr;
1899 struct ieee80211_tx_info *info;
e32f85f7 1900 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1901 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1902 struct ieee80211_local *local = rx->local;
eb9fb5b8 1903 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1904 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1905 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1906 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1907 u16 q, hdrlen;
e32f85f7
LCC		 1908
1909 hdr = (struct ieee80211_hdr *) skb->data;
1910 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1911 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1912
2157fdd6
TP		 1913 /* frame is in RMC, don't forward */
1914 if (ieee80211_is_data(hdr->frame_control) &&
1915 is_multicast_ether_addr(hdr->addr1) &&
1916 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1917 return RX_DROP_MONITOR;
1918
e32f85f7
LCC		 1919 if (!ieee80211_is_data(hdr->frame_control))
1920 return RX_CONTINUE;
1921
1922 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1923 return RX_DROP_MONITOR;
1924
43b7b314 1925 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1926 struct mesh_path *mppath;
43b7b314
JC		 1927 char *proxied_addr;
1928 char *mpp_addr;
1929
1930 if (is_multicast_ether_addr(hdr->addr1)) {
1931 mpp_addr = hdr->addr3;
1932 proxied_addr = mesh_hdr->eaddr1;
1933 } else {
1934 mpp_addr = hdr->addr4;
1935 proxied_addr = mesh_hdr->eaddr2;
1936 }
79617dee 1937
79617dee 1938 rcu_read_lock();
43b7b314 1939 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1940 if (!mppath) {
43b7b314 1941 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1942 } else {
1943 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1944 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1945 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1946 spin_unlock_bh(&mppath->state_lock);
1947 }
1948 rcu_read_unlock();
1949 }
1950
3c5772a5
JC		 1951 /* Frame has reached destination. Don't forward */
1952 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1953 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1954 return RX_CONTINUE;
1955
d3c1597b
TP		 1956 q = ieee80211_select_queue_80211(local, skb, hdr);
1957 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1958 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1959 return RX_DROP_MONITOR;
1960 }
1961 skb_set_queue_mapping(skb, q);
e32f85f7 1962
30789eb6
TP		 1963 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1964 goto out;
c8a61a7d 1965
30789eb6
TP		 1966 if (!--mesh_hdr->ttl) {
1967 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1968 return RX_DROP_MONITOR;
1969 }
1970
1971 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1972 if (!fwd_skb) {
1973 if (net_ratelimit())
1974 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1975 sdata->name);
1976 goto out;
1977 }
1978
1979 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1980 info = IEEE80211_SKB_CB(fwd_skb);
1981 memset(info, 0, sizeof(*info));
1982 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1983 info->control.vif = &rx->sdata->vif;
1984 info->control.jiffies = jiffies;
1985 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1986 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1987 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1988 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1989 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1990 } else {
1991 /* unable to resolve next hop */
1992 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1993 0, reason, fwd_hdr->addr2, sdata);
1994 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
1995 return RX_DROP_MONITOR;
e32f85f7
LCC		 1996 }
1997
30789eb6
TP		 1998 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1999 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 2000 out:
3c5772a5 2001 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 2002 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 2003 return RX_CONTINUE;
2004 else
2005 return RX_DROP_MONITOR;
2006}
bf94e17b 2007#endif
e32f85f7 2008
49461622 2009static ieee80211_rx_result debug_noinline
5cf121c3 2010ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 2011{
eb9fb5b8 2012 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 2013 struct ieee80211_local *local = rx->local;
eb9fb5b8 2014 struct net_device *dev = sdata->dev;
358c8d9d
HH		 2015 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2016 __le16 fc = hdr->frame_control;
4114fa21 2017 bool port_control;
ce3edf6d 2018 int err;
76ee65bf 2019
358c8d9d 2020 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 2021 return RX_CONTINUE;
76ee65bf 2022
358c8d9d 2023 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 2024 return RX_DROP_MONITOR;
76ee65bf 2025
f14543ee 2026 /*
e7f4a940
JB		 2027 * Send unexpected-4addr-frame event to hostapd. For older versions,
2028 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 2029 */
2030 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 2031 sdata->vif.type == NL80211_IFTYPE_AP) {
2032 if (rx->sta &&
2033 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2034 cfg80211_rx_unexpected_4addr_frame(
2035 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 2036 return RX_DROP_MONITOR;
e7f4a940 2037 }
f14543ee 2038
4114fa21 2039 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 2040 if (unlikely(err))
e4c26add 2041 return RX_DROP_UNUSABLE;
76ee65bf 2042
358c8d9d 2043 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 2044 return RX_DROP_MONITOR;
ce3edf6d 2045
4114fa21
FF		 2046 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2047 unlikely(port_control) && sdata->bss) {
2048 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2049 u.ap);
2050 dev = sdata->dev;
2051 rx->sdata = sdata;
2052 }
2053
76ee65bf
RR		 2054 rx->skb->dev = dev;
2055
2056 dev->stats.rx_packets++;
2057 dev->stats.rx_bytes += rx->skb->len;
2058
08ca944e 2059 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2060 !is_multicast_ether_addr(
2061 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2062 (!local->scanning &&
2063 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2064 mod_timer(&local->dynamic_ps_timer, jiffies +
2065 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2066 }
2067
76ee65bf 2068 ieee80211_deliver_skb(rx);
571ecf67 2069
9ae54c84 2070 return RX_QUEUED;
571ecf67
JB		 2071}
2072
49461622 2073static ieee80211_rx_result debug_noinline
24a8fdad 2074ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 2075{
2076 struct ieee80211_local *local = rx->local;
2077 struct ieee80211_hw *hw = &local->hw;
2078 struct sk_buff *skb = rx->skb;
a7767f95 2079 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2080 struct tid_ampdu_rx *tid_agg_rx;
2081 u16 start_seq_num;
2082 u16 tid;
2083
a7767f95 2084 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2085 return RX_CONTINUE;
71364716 2086
a7767f95 2087 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2088 struct {
2089 __le16 control, start_seq_num;
2090 } __packed bar_data;
2091
71364716 2092 if (!rx->sta)
a02ae758 2093 return RX_DROP_MONITOR;
8ae5977f
JB		 2094
2095 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2096 &bar_data, sizeof(bar_data)))
2097 return RX_DROP_MONITOR;
2098
8ae5977f 2099 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2100
2101 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2102 if (!tid_agg_rx)
a02ae758 2103 return RX_DROP_MONITOR;
71364716 2104
8ae5977f 2105 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2106
2107 /* reset session timer */
20ad19d0
JB		 2108 if (tid_agg_rx->timeout)
2109 mod_timer(&tid_agg_rx->session_timer,
2110 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2111
dd318575 2112 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2113 /* release stored frames up to start of BAR */
24a8fdad 2114 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 2115 spin_unlock(&tid_agg_rx->reorder_lock);
2116
a02ae758
JB		 2117 kfree_skb(skb);
2118 return RX_QUEUED;
71364716
RR		 2119 }
2120
08daecae
JB		 2121 /*
2122 * After this point, we only want management frames,
2123 * so we can drop all remaining control frames to
2124 * cooked monitor interfaces.
2125 */
2126 return RX_DROP_MONITOR;
71364716
RR		 2127}
2128
f4f727a6
JM		 2129static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2130 struct ieee80211_mgmt *mgmt,
2131 size_t len)
fea14732
JM		 2132{
2133 struct ieee80211_local *local = sdata->local;
2134 struct sk_buff *skb;
2135 struct ieee80211_mgmt *resp;
2136
47846c9b 2137 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2138 /* Not to own unicast address */
2139 return;
2140 }
2141
46900298
JB		 2142 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2143 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2144 /* Not from the current AP or not associated yet. */
fea14732
JM		 2145 return;
2146 }
2147
2148 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2149 /* Too short SA Query request frame */
2150 return;
2151 }
2152
2153 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2154 if (skb == NULL)
2155 return;
2156
2157 skb_reserve(skb, local->hw.extra_tx_headroom);
2158 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2159 memset(resp, 0, 24);
2160 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2161 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2162 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2163 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2164 IEEE80211_STYPE_ACTION);
2165 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2166 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2167 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2168 memcpy(resp->u.action.u.sa_query.trans_id,
2169 mgmt->u.action.u.sa_query.trans_id,
2170 WLAN_SA_QUERY_TR_ID_LEN);
2171
62ae67be 2172 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2173}
2174
2e161f78
JB		 2175static ieee80211_rx_result debug_noinline
2176ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2177{
2178 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2179 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2180
2181 /*
2182 * From here on, look only at management frames.
2183 * Data and control frames are already handled,
2184 * and unknown (reserved) frames are useless.
2185 */
2186 if (rx->skb->len < 24)
2187 return RX_DROP_MONITOR;
2188
2189 if (!ieee80211_is_mgmt(mgmt->frame_control))
2190 return RX_DROP_MONITOR;
2191
ee971924
JB		 2192 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2193 ieee80211_is_beacon(mgmt->frame_control) &&
2194 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
2195 struct ieee80211_rx_status *status;
2196
2197 status = IEEE80211_SKB_RXCB(rx->skb);
2198 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2199 rx->skb->data, rx->skb->len,
2200 status->freq, GFP_ATOMIC);
2201 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2202 }
2203
554891e6 2204 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2205 return RX_DROP_MONITOR;
2206
2207 if (ieee80211_drop_unencrypted_mgmt(rx))
2208 return RX_DROP_UNUSABLE;
2209
2210 return RX_CONTINUE;
2211}
2212
de1ede7a
JB		 2213static ieee80211_rx_result debug_noinline
2214ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2215{
2216 struct ieee80211_local *local = rx->local;
eb9fb5b8 2217 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2218 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2219 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2220 int len = rx->skb->len;
2221
2222 if (!ieee80211_is_action(mgmt->frame_control))
2223 return RX_CONTINUE;
2224
026331c4
JM		 2225 /* drop too small frames */
2226 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2227 return RX_DROP_UNUSABLE;
de1ede7a 2228
026331c4 2229 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2230 return RX_DROP_UNUSABLE;
de1ede7a 2231
554891e6 2232 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2233 return RX_DROP_UNUSABLE;
97ebe12a 2234
de1ede7a
JB		 2235 switch (mgmt->u.action.category) {
2236 case WLAN_CATEGORY_BACK:
8abd3f9b 2237 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2238 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2239 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2240 sdata->vif.type != NL80211_IFTYPE_AP &&
2241 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2242 break;
8abd3f9b 2243
026331c4
JM		 2244 /* verify action_code is present */
2245 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2246 break;
2247
de1ede7a
JB		 2248 switch (mgmt->u.action.u.addba_req.action_code) {
2249 case WLAN_ACTION_ADDBA_REQ:
2250 if (len < (IEEE80211_MIN_ACTION_SIZE +
2251 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2252 goto invalid;
2253 break;
de1ede7a
JB		 2254 case WLAN_ACTION_ADDBA_RESP:
2255 if (len < (IEEE80211_MIN_ACTION_SIZE +
2256 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2257 goto invalid;
2258 break;
de1ede7a
JB		 2259 case WLAN_ACTION_DELBA:
2260 if (len < (IEEE80211_MIN_ACTION_SIZE +
2261 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2262 goto invalid;
2263 break;
2264 default:
2265 goto invalid;
de1ede7a 2266 }
bed7ee6e 2267
8b58ff83 2268 goto queue;
39192c0b
JB		 2269 case WLAN_CATEGORY_SPECTRUM_MGMT:
2270 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2271 break;
46900298
JB		 2272
2273 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2274 break;
46900298 2275
026331c4
JM		 2276 /* verify action_code is present */
2277 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2278 break;
2279
39192c0b
JB		 2280 switch (mgmt->u.action.u.measurement.action_code) {
2281 case WLAN_ACTION_SPCT_MSR_REQ:
2282 if (len < (IEEE80211_MIN_ACTION_SIZE +
2283 sizeof(mgmt->u.action.u.measurement)))
84040805 2284 break;
39192c0b 2285 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2286 goto handled;
c481ec97
S		 2287 case WLAN_ACTION_SPCT_CHL_SWITCH:
2288 if (len < (IEEE80211_MIN_ACTION_SIZE +
2289 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2290 break;
c481ec97 2291
cc32abd4 2292 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2293 break;
cc32abd4 2294
46900298 2295 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2296 break;
c481ec97 2297
8b58ff83 2298 goto queue;
39192c0b
JB		 2299 }
2300 break;
fea14732
JM		 2301 case WLAN_CATEGORY_SA_QUERY:
2302 if (len < (IEEE80211_MIN_ACTION_SIZE +
2303 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2304 break;
2305
fea14732
JM		 2306 switch (mgmt->u.action.u.sa_query.action) {
2307 case WLAN_ACTION_SA_QUERY_REQUEST:
2308 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2309 break;
fea14732 2310 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2311 goto handled;
fea14732
JM		 2312 }
2313 break;
8db09850
TP		 2314 case WLAN_CATEGORY_SELF_PROTECTED:
2315 switch (mgmt->u.action.u.self_prot.action_code) {
2316 case WLAN_SP_MESH_PEERING_OPEN:
2317 case WLAN_SP_MESH_PEERING_CLOSE:
2318 case WLAN_SP_MESH_PEERING_CONFIRM:
2319 if (!ieee80211_vif_is_mesh(&sdata->vif))
2320 goto invalid;
2321 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2322 /* userspace handles this frame */
2323 break;
2324 goto queue;
2325 case WLAN_SP_MGK_INFORM:
2326 case WLAN_SP_MGK_ACK:
2327 if (!ieee80211_vif_is_mesh(&sdata->vif))
2328 goto invalid;
2329 break;
2330 }
2331 break;
d3aaec8a 2332 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2333 if (!ieee80211_vif_is_mesh(&sdata->vif))
2334 break;
25d49e4d
TP		 2335 if (mesh_action_is_path_sel(mgmt) &&
2336 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2337 break;
2338 goto queue;
84040805 2339 }
026331c4 2340
2e161f78
JB		 2341 return RX_CONTINUE;
2342
bed7ee6e 2343 invalid:
554891e6 2344 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2345 /* will return in the next handlers */
2346 return RX_CONTINUE;
2347
2348 handled:
2349 if (rx->sta)
2350 rx->sta->rx_packets++;
2351 dev_kfree_skb(rx->skb);
2352 return RX_QUEUED;
2353
2354 queue:
2355 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2356 skb_queue_tail(&sdata->skb_queue, rx->skb);
2357 ieee80211_queue_work(&local->hw, &sdata->work);
2358 if (rx->sta)
2359 rx->sta->rx_packets++;
2360 return RX_QUEUED;
2361}
2362
2363static ieee80211_rx_result debug_noinline
2364ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2365{
554891e6 2366 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2367
2368 /* skip known-bad action frames and return them in the next handler */
554891e6 2369 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2370 return RX_CONTINUE;
d7907448 2371
026331c4
JM		 2372 /*
2373 * Getting here means the kernel doesn't know how to handle
2374 * it, but maybe userspace does ... include returned frames
2375 * so userspace can register for those to know whether ones
2376 * it transmitted were processed or returned.
2377 */
026331c4 2378
2e161f78
JB		 2379 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2380 rx->skb->data, rx->skb->len,
2381 GFP_ATOMIC)) {
2382 if (rx->sta)
2383 rx->sta->rx_packets++;
2384 dev_kfree_skb(rx->skb);
2385 return RX_QUEUED;
2386 }
2387
2388
2389 return RX_CONTINUE;
2390}
2391
2392static ieee80211_rx_result debug_noinline
2393ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2394{
2395 struct ieee80211_local *local = rx->local;
2396 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2397 struct sk_buff *nskb;
2398 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2399 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2400
2401 if (!ieee80211_is_action(mgmt->frame_control))
2402 return RX_CONTINUE;
2403
2404 /*
2405 * For AP mode, hostapd is responsible for handling any action
2406 * frames that we didn't handle, including returning unknown
2407 * ones. For all other modes we will return them to the sender,
2408 * setting the 0x80 bit in the action category, as required by
2409 * 802.11-2007 7.3.1.11.
2410 * Newer versions of hostapd shall also use the management frame
2411 * registration mechanisms, but older ones still use cooked
2412 * monitor interfaces so push all frames there.
2413 */
554891e6 2414 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2415 (sdata->vif.type == NL80211_IFTYPE_AP ||
2416 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2417 return RX_DROP_MONITOR;
026331c4 2418
84040805
JB		 2419 /* do not return rejected action frames */
2420 if (mgmt->u.action.category & 0x80)
2421 return RX_DROP_UNUSABLE;
2422
2423 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2424 GFP_ATOMIC);
2425 if (nskb) {
292b4df6 2426 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2427
292b4df6
JL		 2428 nmgmt->u.action.category |= 0x80;
2429 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2430 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2431
2432 memset(nskb->cb, 0, sizeof(nskb->cb));
2433
2434 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2435 }
39192c0b
JB		 2436 dev_kfree_skb(rx->skb);
2437 return RX_QUEUED;
de1ede7a
JB		 2438}
2439
49461622 2440static ieee80211_rx_result debug_noinline
5cf121c3 2441ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2442{
eb9fb5b8 2443 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2444 ieee80211_rx_result rxs;
77a121c3
JB		 2445 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2446 __le16 stype;
571ecf67 2447
af6b6374
JB		 2448 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2449 if (rxs != RX_CONTINUE)
2450 return rxs;
2451
77a121c3 2452 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2453
77a121c3
JB		 2454 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2455 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2456 sdata->vif.type != NL80211_IFTYPE_STATION)
2457 return RX_DROP_MONITOR;
472dbc45 2458
77a121c3
JB		 2459 switch (stype) {
2460 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2461 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2462 /* process for all: mesh, mlme, ibss */
2463 break;
2464 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2465 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2466 if (is_multicast_ether_addr(mgmt->da) &&
2467 !is_broadcast_ether_addr(mgmt->da))
2468 return RX_DROP_MONITOR;
2469
77a121c3
JB		 2470 /* process only for station */
2471 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2472 return RX_DROP_MONITOR;
2473 break;
2474 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2475 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2476 /* process only for ibss */
2477 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2478 return RX_DROP_MONITOR;
2479 break;
2480 default:
2481 return RX_DROP_MONITOR;
2482 }
f9d540ee 2483
77a121c3 2484 /* queue up frame and kick off work to process it */
c1475ca9 2485 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2486 skb_queue_tail(&sdata->skb_queue, rx->skb);
2487 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2488 if (rx->sta)
2489 rx->sta->rx_packets++;
46900298 2490
77a121c3 2491 return RX_QUEUED;
571ecf67
JB		 2492}
2493
5cf121c3 2494/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2495static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2496 struct ieee80211_rate *rate)
3d30d949
MW		 2497{
2498 struct ieee80211_sub_if_data *sdata;
2499 struct ieee80211_local *local = rx->local;
2500 struct ieee80211_rtap_hdr {
2501 struct ieee80211_radiotap_header hdr;
2502 u8 flags;
5f0b7de5 2503 u8 rate_or_pad;
3d30d949
MW		 2504 __le16 chan_freq;
2505 __le16 chan_flags;
bc10502d 2506 } __packed *rthdr;
3d30d949
MW		 2507 struct sk_buff *skb = rx->skb, *skb2;
2508 struct net_device *prev_dev = NULL;
eb9fb5b8 2509 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2510
554891e6
JB		 2511 /*
2512 * If cooked monitor has been processed already, then
2513 * don't do it again. If not, set the flag.
2514 */
2515 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2516 goto out_free_skb;
554891e6 2517 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2518
152c477a
JB		 2519 /* If there are no cooked monitor interfaces, just free the SKB */
2520 if (!local->cooked_mntrs)
2521 goto out_free_skb;
2522
3d30d949
MW		 2523 if (skb_headroom(skb) < sizeof(*rthdr) &&
2524 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2525 goto out_free_skb;
2526
2527 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2528 memset(rthdr, 0, sizeof(*rthdr));
2529 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2530 rthdr->hdr.it_present =
2531 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2532 (1 << IEEE80211_RADIOTAP_CHANNEL));
2533
5f0b7de5
JB		 2534 if (rate) {
2535 rthdr->rate_or_pad = rate->bitrate / 5;
2536 rthdr->hdr.it_present |=
2537 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2538 }
3d30d949
MW		 2539 rthdr->chan_freq = cpu_to_le16(status->freq);
2540
2541 if (status->band == IEEE80211_BAND_5GHZ)
2542 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2543 IEEE80211_CHAN_5GHZ);
2544 else
2545 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2546 IEEE80211_CHAN_2GHZ);
2547
2548 skb_set_mac_header(skb, 0);
2549 skb->ip_summed = CHECKSUM_UNNECESSARY;
2550 skb->pkt_type = PACKET_OTHERHOST;
2551 skb->protocol = htons(ETH_P_802_2);
2552
2553 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2554 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2555 continue;
2556
05c914fe 2557 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2558 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2559 continue;
2560
2561 if (prev_dev) {
2562 skb2 = skb_clone(skb, GFP_ATOMIC);
2563 if (skb2) {
2564 skb2->dev = prev_dev;
5548a8a1 2565 netif_receive_skb(skb2);
3d30d949
MW		 2566 }
2567 }
2568
2569 prev_dev = sdata->dev;
2570 sdata->dev->stats.rx_packets++;
2571 sdata->dev->stats.rx_bytes += skb->len;
2572 }
2573
2574 if (prev_dev) {
2575 skb->dev = prev_dev;
5548a8a1 2576 netif_receive_skb(skb);
554891e6
JB		 2577 return;
2578 }
3d30d949
MW		 2579
2580 out_free_skb:
2581 dev_kfree_skb(skb);
2582}
2583
aa0c8636
CL		 2584static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2585 ieee80211_rx_result res)
2586{
2587 switch (res) {
2588 case RX_DROP_MONITOR:
2589 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2590 if (rx->sta)
2591 rx->sta->rx_dropped++;
2592 /* fall through */
2593 case RX_CONTINUE: {
2594 struct ieee80211_rate *rate = NULL;
2595 struct ieee80211_supported_band *sband;
2596 struct ieee80211_rx_status *status;
2597
2598 status = IEEE80211_SKB_RXCB((rx->skb));
2599
2600 sband = rx->local->hw.wiphy->bands[status->band];
2601 if (!(status->flag & RX_FLAG_HT))
2602 rate = &sband->bitrates[status->rate_idx];
2603
2604 ieee80211_rx_cooked_monitor(rx, rate);
2605 break;
2606 }
2607 case RX_DROP_UNUSABLE:
2608 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2609 if (rx->sta)
2610 rx->sta->rx_dropped++;
2611 dev_kfree_skb(rx->skb);
2612 break;
2613 case RX_QUEUED:
2614 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2615 break;
2616 }
2617}
571ecf67 2618
24a8fdad 2619static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2620{
58905290 2621 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2622 struct sk_buff *skb;
8944b79f 2623
e32f85f7
LCC		 2624#define CALL_RXH(rxh) \
2625 do { \
2626 res = rxh(rx); \
2627 if (res != RX_CONTINUE) \
2569a826 2628 goto rxh_next; \
e32f85f7 2629 } while (0);
49461622 2630
24a8fdad
CL		 2631 spin_lock(&rx->local->rx_skb_queue.lock);
2632 if (rx->local->running_rx_handler)
2633 goto unlock;
2634
2635 rx->local->running_rx_handler = true;
2636
2637 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2638 spin_unlock(&rx->local->rx_skb_queue.lock);
2639
2569a826
JB		 2640 /*
2641 * all the other fields are valid across frames
2642 * that belong to an aMPDU since they are on the
2643 * same TID from the same station
2644 */
2645 rx->skb = skb;
2646
2647 CALL_RXH(ieee80211_rx_h_decrypt)
2648 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2649 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2650 CALL_RXH(ieee80211_rx_h_sta_process)
2651 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2652 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2653 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2654#ifdef CONFIG_MAC80211_MESH
aa0c8636 2655 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2656 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2657#endif
2154c81c
JC		 2658 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2659 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2660 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2661 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2662 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2663 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2664 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2665 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2666 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2667
aa0c8636
CL		 2668 rxh_next:
2669 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2670 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2671#undef CALL_RXH
aa0c8636 2672 }
24a8fdad
CL		 2673
2674 rx->local->running_rx_handler = false;
2675
2676 unlock:
2677 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2678}
2679
4406c376 2680static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2681{
aa0c8636
CL		 2682 ieee80211_rx_result res = RX_DROP_MONITOR;
2683
aa0c8636
CL		 2684#define CALL_RXH(rxh) \
2685 do { \
2686 res = rxh(rx); \
2687 if (res != RX_CONTINUE) \
2688 goto rxh_next; \
2689 } while (0);
2690
2691 CALL_RXH(ieee80211_rx_h_passive_scan)
2692 CALL_RXH(ieee80211_rx_h_check)
2693
24a8fdad 2694 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2695
24a8fdad 2696 ieee80211_rx_handlers(rx);
aa0c8636 2697 return;
49461622 2698
2569a826 2699 rxh_next:
aa0c8636
CL		 2700 ieee80211_rx_handlers_result(rx, res);
2701
2702#undef CALL_RXH
58905290
JB		 2703}
2704
2bff8ebf 2705/*
dd318575
JB		 2706 * This function makes calls into the RX path, therefore
2707 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2708 */
2709void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2710{
554891e6
JB		 2711 struct ieee80211_rx_data rx = {
2712 .sta = sta,
2713 .sdata = sta->sdata,
2714 .local = sta->local,
9e26297a
JB		 2715 /* This is OK -- must be QoS data frame */
2716 .security_idx = tid,
2717 .seqno_idx = tid,
fcf8bd3b 2718 .flags = 0,
554891e6 2719 };
2c15a0cf
CL		 2720 struct tid_ampdu_rx *tid_agg_rx;
2721
2722 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2723 if (!tid_agg_rx)
2724 return;
2bff8ebf 2725
2c15a0cf 2726 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2727 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2728 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2729
24a8fdad 2730 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2731}
2732
571ecf67
JB		 2733/* main receive path */
2734
20b01f80 2735static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2736 struct ieee80211_hdr *hdr)
2737{
20b01f80 2738 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2739 struct sk_buff *skb = rx->skb;
2740 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2741 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2742 int multicast = is_multicast_ether_addr(hdr->addr1);
2743
51fb61e7 2744 switch (sdata->vif.type) {
05c914fe 2745 case NL80211_IFTYPE_STATION:
9bc383de 2746 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2747 return 0;
77fdaa12 2748 if (!multicast &&
47846c9b 2749 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4f312336
FF		 2750 if (!(sdata->dev->flags & IFF_PROMISC) ||
2751 sdata->u.mgd.use_4addr)
23a24def 2752 return 0;
554891e6 2753 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2754 }
2755 break;
05c914fe 2756 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2757 if (!bssid)
2758 return 0;
a7767f95 2759 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2760 return 1;
87291c02 2761 }
46900298 2762 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2763 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2764 return 0;
554891e6 2765 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2766 } else if (!multicast &&
47846c9b 2767 compare_ether_addr(sdata->vif.addr,
23a24def 2768 hdr->addr1) != 0) {
4150c572 2769 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2770 return 0;
554891e6 2771 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2772 } else if (!rx->sta) {
2773 int rate_idx;
eb9fb5b8 2774 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2775 rate_idx = 0; /* TODO: HT rates */
2776 else
eb9fb5b8 2777 rate_idx = status->rate_idx;
34e89507
JB		 2778 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2779 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2780 }
23a24def 2781 break;
05c914fe 2782 case NL80211_IFTYPE_MESH_POINT:
6032f934 2783 if (!multicast &&
47846c9b 2784 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2785 hdr->addr1) != 0) {
2786 if (!(sdata->dev->flags & IFF_PROMISC))
2787 return 0;
2788
554891e6 2789 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2790 }
2791 break;
05c914fe
JB		 2792 case NL80211_IFTYPE_AP_VLAN:
2793 case NL80211_IFTYPE_AP:
23a24def 2794 if (!bssid) {
47846c9b 2795 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2796 hdr->addr1))
2797 return 0;
2798 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2799 sdata->vif.addr)) {
771bbd09 2800 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
a21fa87e
AN		 2801 !ieee80211_is_beacon(hdr->frame_control) &&
2802 !(ieee80211_is_action(hdr->frame_control) &&
2803 sdata->vif.p2p))
23a24def 2804 return 0;
554891e6 2805 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2806 }
23a24def 2807 break;
05c914fe 2808 case NL80211_IFTYPE_WDS:
a7767f95 2809 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2810 return 0;
2811 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2812 return 0;
2813 break;
2ca27bcf 2814 default:
fb1c1cd6
JB		 2815 /* should never get here */
2816 WARN_ON(1);
2817 break;
23a24def
JB		 2818 }
2819
2820 return 1;
2821}
2822
4406c376
JB		 2823/*
2824 * This function returns whether or not the SKB
2825 * was destined for RX processing or not, which,
2826 * if consume is true, is equivalent to whether
2827 * or not the skb was consumed.
2828 */
2829static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2830 struct sk_buff *skb, bool consume)
2831{
2832 struct ieee80211_local *local = rx->local;
2833 struct ieee80211_sub_if_data *sdata = rx->sdata;
2834 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2835 struct ieee80211_hdr *hdr = (void *)skb->data;
2836 int prepares;
2837
2838 rx->skb = skb;
554891e6 2839 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2840 prepares = prepare_for_handlers(rx, hdr);
2841
2842 if (!prepares)
2843 return false;
2844
4406c376
JB		 2845 if (!consume) {
2846 skb = skb_copy(skb, GFP_ATOMIC);
2847 if (!skb) {
2848 if (net_ratelimit())
2849 wiphy_debug(local->hw.wiphy,
b305dae4 2850 "failed to copy skb for %s\n",
4406c376
JB		 2851 sdata->name);
2852 return true;
2853 }
2854
2855 rx->skb = skb;
2856 }
2857
2858 ieee80211_invoke_rx_handlers(rx);
2859 return true;
2860}
2861
571ecf67 2862/*
6368e4b1
RR		 2863 * This is the actual Rx frames handler. as it blongs to Rx path it must
2864 * be called with rcu_read_lock protection.
571ecf67 2865 */
71ebb4aa 2866static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2867 struct sk_buff *skb)
571ecf67 2868{
554891e6 2869 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2870 struct ieee80211_local *local = hw_to_local(hw);
2871 struct ieee80211_sub_if_data *sdata;
571ecf67 2872 struct ieee80211_hdr *hdr;
e3cf8b3f 2873 __le16 fc;
5cf121c3 2874 struct ieee80211_rx_data rx;
4406c376 2875 struct ieee80211_sub_if_data *prev;
56af3268 2876 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2877 int err = 0;
571ecf67 2878
e3cf8b3f 2879 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2880 memset(&rx, 0, sizeof(rx));
2881 rx.skb = skb;
2882 rx.local = local;
72abd81b 2883
e3cf8b3f 2884 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2885 local->dot11ReceivedFragmentCount++;
571ecf67 2886
142b9f50 2887 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
b23b025f 2888 test_bit(SCAN_SW_SCANNING, &local->scanning)))
554891e6 2889 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2890
e3cf8b3f
ZY		 2891 if (ieee80211_is_mgmt(fc))
2892 err = skb_linearize(skb);
2893 else
2894 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2895
2896 if (err) {
2897 dev_kfree_skb(skb);
2898 return;
2899 }
2900
2901 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2902 ieee80211_parse_qos(&rx);
d1c3a37c 2903 ieee80211_verify_alignment(&rx);
38f3714d 2904
e3cf8b3f 2905 if (ieee80211_is_data(fc)) {
56af3268 2906 prev_sta = NULL;
4406c376 2907
2a33bee2 2908 for_each_sta_info_rx(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2909 if (!prev_sta) {
2910 prev_sta = sta;
2911 continue;
2912 }
2913
2914 rx.sta = prev_sta;
2915 rx.sdata = prev_sta->sdata;
4406c376 2916 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2917
56af3268 2918 prev_sta = sta;
4406c376 2919 }
56af3268
BG		 2920
2921 if (prev_sta) {
2922 rx.sta = prev_sta;
2923 rx.sdata = prev_sta->sdata;
2924
4406c376 2925 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2926 return;
8e26d5ad 2927 goto out;
56af3268 2928 }
4406c376
JB		 2929 }
2930
4b0dd98e 2931 prev = NULL;
b2e7771e 2932
4b0dd98e
JB		 2933 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2934 if (!ieee80211_sdata_running(sdata))
2935 continue;
340e11f3 2936
4b0dd98e
JB		 2937 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2938 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2939 continue;
340e11f3 2940
4b0dd98e
JB		 2941 /*
2942 * frame is destined for this interface, but if it's
2943 * not also for the previous one we handle that after
2944 * the loop to avoid copying the SKB once too much
2945 */
4bb29f8c 2946
4b0dd98e 2947 if (!prev) {
abe60632 2948 prev = sdata;
4b0dd98e 2949 continue;
340e11f3 2950 }
4bb29f8c 2951
2a33bee2 2952 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e
JB		 2953 rx.sdata = prev;
2954 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2955
4b0dd98e
JB		 2956 prev = sdata;
2957 }
2958
2959 if (prev) {
2a33bee2 2960 rx.sta = sta_info_get_bss_rx(prev, hdr->addr2);
4b0dd98e 2961 rx.sdata = prev;
4406c376 2962
4b0dd98e
JB		 2963 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2964 return;
571ecf67 2965 }
4406c376 2966
8e26d5ad 2967 out:
4406c376 2968 dev_kfree_skb(skb);
571ecf67 2969}
6368e4b1
RR		 2970
2971/*
2972 * This is the receive path handler. It is called by a low level driver when an
2973 * 802.11 MPDU is received from the hardware.
2974 */
103bf9f7 2975void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2976{
2977 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2978 struct ieee80211_rate *rate = NULL;
2979 struct ieee80211_supported_band *sband;
f1d58c25 2980 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2981
d20ef63d
JB		 2982 WARN_ON_ONCE(softirq_count() == 0);
2983
77a980dc
JB		 2984 if (WARN_ON(status->band < 0 ||
2985 status->band >= IEEE80211_NUM_BANDS))
2986 goto drop;
8318d78a
JB		 2987
2988 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2989 if (WARN_ON(!sband))
2990 goto drop;
8318d78a 2991
89c3a8ac
JB		 2992 /*
2993 * If we're suspending, it is possible although not too likely
2994 * that we'd be receiving frames after having already partially
2995 * quiesced the stack. We can't process such frames then since
2996 * that might, for example, cause stations to be added or other
2997 * driver callbacks be invoked.
2998 */
77a980dc
JB		 2999 if (unlikely(local->quiescing || local->suspended))
3000 goto drop;
89c3a8ac 3001
ea77f12f
JB		 3002 /*
3003 * The same happens when we're not even started,
3004 * but that's worth a warning.
3005 */
77a980dc
JB		 3006 if (WARN_ON(!local->started))
3007 goto drop;
ea77f12f 3008
fc885189 3009 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 3010 /*
fc885189
JB		 3011 * Validate the rate, unless a PLCP error means that
3012 * we probably can't have a valid rate here anyway.
e5d6eb83 3013 */
fc885189
JB		 3014
3015 if (status->flag & RX_FLAG_HT) {
3016 /*
3017 * rate_idx is MCS index, which can be [0-76]
3018 * as documented on:
3019 *
3020 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3021 *
3022 * Anything else would be some sort of driver or
3023 * hardware error. The driver should catch hardware
3024 * errors.
3025 */
3026 if (WARN((status->rate_idx < 0 ||
3027 status->rate_idx > 76),
3028 "Rate marked as an HT rate but passed "
3029 "status->rate_idx is not "
3030 "an MCS index [0-76]: %d (0x%02x)\n",
3031 status->rate_idx,
3032 status->rate_idx))
3033 goto drop;
3034 } else {
3035 if (WARN_ON(status->rate_idx < 0 ||
3036 status->rate_idx >= sband->n_bitrates))
3037 goto drop;
3038 rate = &sband->bitrates[status->rate_idx];
3039 }
0fb8ca45 3040 }
6368e4b1 3041
554891e6
JB		 3042 status->rx_flags = 0;
3043
6368e4b1
RR		 3044 /*
3045 * key references and virtual interfaces are protected using RCU
3046 * and this requires that we are in a read-side RCU section during
3047 * receive processing
3048 */
3049 rcu_read_lock();
3050
3051 /*
3052 * Frames with failed FCS/PLCP checksum are not returned,
3053 * all other frames are returned without radiotap header
3054 * if it was previously present.
3055 * Also, frames with less than 16 bytes are dropped.
3056 */
f1d58c25 3057 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3058 if (!skb) {
3059 rcu_read_unlock();
3060 return;
3061 }
3062
e1e54068
JB		 3063 ieee80211_tpt_led_trig_rx(local,
3064 ((struct ieee80211_hdr *)skb->data)->frame_control,
3065 skb->len);
071d9ac2 3066 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3067
3068 rcu_read_unlock();
77a980dc
JB		 3069
3070 return;
3071 drop:
3072 kfree_skb(skb);
6368e4b1 3073}
103bf9f7 3074EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3075
3076/* This is a version of the rx handler that can be called from hard irq
3077 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3078void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3079{
3080 struct ieee80211_local *local = hw_to_local(hw);
3081
3082 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3083
571ecf67
JB		 3084 skb->pkt_type = IEEE80211_RX_MSG;
3085 skb_queue_tail(&local->skb_queue, skb);
3086 tasklet_schedule(&local->tasklet);
3087}
3088EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)