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mac80211: fix release_reorder_timeout in scan
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
601ae7f2
BR		 88 return len;
89}
90
d1c3a37c 91/*
601ae7f2
BR		 92 * ieee80211_add_rx_radiotap_header - add radiotap header
93 *
94 * add a radiotap header containing all the fields which the hardware provided.
95 */
96static void
97ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98 struct sk_buff *skb,
601ae7f2
BR		 99 struct ieee80211_rate *rate,
100 int rtap_len)
101{
f1d58c25 102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 103 struct ieee80211_radiotap_header *rthdr;
104 unsigned char *pos;
6a86b9c7 105 u16 rx_flags = 0;
601ae7f2
BR		 106
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
109
110 /* radiotap header, set always present flags */
111 rthdr->it_present =
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
117
118 pos = (unsigned char *)(rthdr+1);
119
120 /* the order of the following fields is important */
121
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 124 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 125 rthdr->it_present |=
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127 pos += 8;
128 }
129
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 137 pos++;
138
139 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 140 if (status->flag & RX_FLAG_HT) {
141 /*
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147 */
148 *pos = 0;
8d6f658e 149 } else {
ebe6c7ba 150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 151 *pos = rate->bitrate / 5;
8d6f658e 152 }
601ae7f2
BR		 153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 156 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
5f0b7de5
JB		 161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
9deb1ae5 164 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
601ae7f2 167 else
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2
BR		 170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
601ae7f2
BR		 180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
601ae7f2
BR		 186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 190 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 191 pos++;
aae89831 192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
601ae7f2
BR		 195 pos += 2;
196}
197
b2e7771e
JB		 198/*
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
202 */
203static struct sk_buff *
204ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 205 struct ieee80211_rate *rate)
b2e7771e 206{
f1d58c25 207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 208 struct ieee80211_sub_if_data *sdata;
b2e7771e 209 int needed_headroom = 0;
b2e7771e
JB		 210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
b2e7771e
JB		 213
214 /*
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
218 *
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
221 */
0869aea0
JB		 222
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 225
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
228
e3cf8b3f
ZY		 229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
232 return NULL;
233 }
234
b2e7771e 235 if (!local->monitors) {
0869aea0 236 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 237 dev_kfree_skb(origskb);
238 return NULL;
239 }
240
0869aea0 241 return remove_monitor_info(local, origskb);
b2e7771e
JB		 242 }
243
0869aea0 244 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 245 /* only need to expand headroom if necessary */
246 skb = origskb;
247 origskb = NULL;
248
249 /*
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
255 */
256 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 258 dev_kfree_skb(skb);
259 return NULL;
260 }
261 } else {
262 /*
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
265 */
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
0869aea0 268 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 269
270 if (!skb)
271 return origskb;
272 }
273
0869aea0
JB		 274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 276
ce3edf6d 277 skb_reset_mac_header(skb);
b2e7771e
JB		 278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 284 continue;
285
3d30d949
MW		 286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287 continue;
288
9607e6b6 289 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 290 continue;
291
b2e7771e
JB		 292 if (prev_dev) {
293 skb2 = skb_clone(skb, GFP_ATOMIC);
294 if (skb2) {
295 skb2->dev = prev_dev;
5548a8a1 296 netif_receive_skb(skb2);
b2e7771e
JB		 297 }
298 }
299
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
303 }
304
305 if (prev_dev) {
306 skb->dev = prev_dev;
5548a8a1 307 netif_receive_skb(skb);
b2e7771e
JB		 308 } else
309 dev_kfree_skb(skb);
310
311 return origskb;
312}
313
314
5cf121c3 315static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 316{
238f74a2 317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 318 int tid;
319
320 /* does the frame have a qos control field? */
238f74a2
HH		 321 if (ieee80211_is_data_qos(hdr->frame_control)) {
322 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 323 /* frame has qos control */
238f74a2
HH		 324 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 326 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 327 else
5cf121c3 328 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 329 } else {
1411f9b5
JB		 330 /*
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 *
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
338 *
339 * We also use that counter for non-QoS STAs.
340 */
341 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 342 }
52865dfd 343
5cf121c3 344 rx->queue = tid;
6e0d114d
JB		 345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 348}
6e0d114d 349
d1c3a37c
JB		 350/**
351 * DOC: Packet alignment
352 *
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
354 * to the stack.
355 *
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
d1c3a37c
JB		 364 *
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
370 *
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
374 */
375static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 376{
59d9cb07
KV		 377#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx->skb->data & 1,
379 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 380#endif
6e0d114d
JB		 381}
382
6368e4b1 383
571ecf67
JB		 384/* rx handlers */
385
49461622 386static ieee80211_rx_result debug_noinline
5cf121c3 387ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 388{
389 struct ieee80211_local *local = rx->local;
390 struct sk_buff *skb = rx->skb;
391
4080c7cd
JB		 392 if (likely(!(rx->flags & IEEE80211_RX_IN_SCAN)))
393 return RX_CONTINUE;
394
395 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
f1d58c25 396 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 397
4080c7cd 398 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
ece8eddd 399 /* drop all the other packets during a software scan anyway */
f1d58c25 400 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 401 dev_kfree_skb(skb);
9ae54c84 402 return RX_QUEUED;
571ecf67
JB		 403 }
404
4080c7cd
JB		 405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
407 return RX_DROP_UNUSABLE;
571ecf67
JB		 408}
409
3cfcf6ac
JM		 410
411static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
412{
413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
414
415 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
416 return 0;
417
418 return ieee80211_is_robust_mgmt_frame(hdr);
419}
420
421
422static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
423{
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
425
426 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
427 return 0;
428
429 return ieee80211_is_robust_mgmt_frame(hdr);
430}
431
432
433/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
435{
436 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
437 struct ieee80211_mmie *mmie;
438
439 if (skb->len < 24 + sizeof(*mmie) ||
440 !is_multicast_ether_addr(hdr->da))
441 return -1;
442
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
444 return -1; /* not a robust management frame */
445
446 mmie = (struct ieee80211_mmie *)
447 (skb->data + skb->len - sizeof(*mmie));
448 if (mmie->element_id != WLAN_EID_MMIE ||
449 mmie->length != sizeof(*mmie) - 2)
450 return -1;
451
452 return le16_to_cpu(mmie->key_id);
453}
454
455
33b64eb2 456static ieee80211_rx_result
5cf121c3 457ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 458{
a7767f95
HH		 459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
460 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 461 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 462
a7767f95 463 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 464 if (is_multicast_ether_addr(hdr->addr1)) {
465 if (ieee80211_has_tods(hdr->frame_control) ||
466 !ieee80211_has_fromds(hdr->frame_control))
467 return RX_DROP_MONITOR;
468 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
469 return RX_DROP_MONITOR;
470 } else {
471 if (!ieee80211_has_a4(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
475 }
33b64eb2
LCC		 476 }
477
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
480 */
481
b4e08ea1 482 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 483 struct ieee80211_mgmt *mgmt;
d6d1a5a7 484
a7767f95 485 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 486 return RX_DROP_MONITOR;
487
a7767f95 488 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 489 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 490 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 491 return RX_DROP_MONITOR;
33b64eb2 492 return RX_CONTINUE;
33b64eb2
LCC		 493 }
494
a7767f95
HH		 495 if (ieee80211_is_probe_req(hdr->frame_control) ||
496 ieee80211_is_probe_resp(hdr->frame_control) ||
497 ieee80211_is_beacon(hdr->frame_control))
498 return RX_CONTINUE;
499
500 return RX_DROP_MONITOR;
501
502 }
503
504#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
505
506 if (ieee80211_is_data(hdr->frame_control) &&
507 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 508 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 509 return RX_DROP_MONITOR;
902acc78 510#undef msh_h_get
d6d1a5a7 511
902acc78
JB		 512 return RX_CONTINUE;
513}
33b64eb2 514
1edfb1af
JB		 515#define SEQ_MODULO 0x1000
516#define SEQ_MASK 0xfff
517
518static inline int seq_less(u16 sq1, u16 sq2)
519{
520 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
521}
522
523static inline u16 seq_inc(u16 sq)
524{
525 return (sq + 1) & SEQ_MASK;
526}
527
528static inline u16 seq_sub(u16 sq1, u16 sq2)
529{
530 return (sq1 - sq2) & SEQ_MASK;
531}
532
533
534static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
535 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 536 int index,
537 struct sk_buff_head *frames)
1edfb1af 538{
1edfb1af 539 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
1edfb1af
JB		 540
541 if (!skb)
542 goto no_frame;
543
071d9ac2 544 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 545 tid_agg_rx->stored_mpdu_num--;
546 tid_agg_rx->reorder_buf[index] = NULL;
d29cecda 547 __skb_queue_tail(frames, skb);
1edfb1af
JB		 548
549no_frame:
550 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
551}
552
553static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
554 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 555 u16 head_seq_num,
556 struct sk_buff_head *frames)
1edfb1af
JB		 557{
558 int index;
559
560 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
561 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
562 tid_agg_rx->buf_size;
2569a826 563 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
1edfb1af
JB		 564 }
565}
566
567/*
568 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
569 * the skb was added to the buffer longer than this time ago, the earlier
570 * frames that have not yet been received are assumed to be lost and the skb
571 * can be released for processing. This may also release other skb's from the
572 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 573 *
574 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 575 */
576#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
577
aa0c8636
CL		 578static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
579 struct tid_ampdu_rx *tid_agg_rx,
580 struct sk_buff_head *frames)
581{
2bff8ebf 582 int index, j;
aa0c8636
CL		 583
584 /* release the buffer until next missing frame */
585 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
586 tid_agg_rx->buf_size;
587 if (!tid_agg_rx->reorder_buf[index] &&
588 tid_agg_rx->stored_mpdu_num > 1) {
589 /*
590 * No buffers ready to be released, but check whether any
591 * frames in the reorder buffer have timed out.
592 */
aa0c8636
CL		 593 int skipped = 1;
594 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
595 j = (j + 1) % tid_agg_rx->buf_size) {
596 if (!tid_agg_rx->reorder_buf[j]) {
597 skipped++;
598 continue;
599 }
600 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
601 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 602 goto set_release_timer;
aa0c8636
CL		 603
604#ifdef CONFIG_MAC80211_HT_DEBUG
605 if (net_ratelimit())
0fb9a9ec
JP		 606 wiphy_debug(hw->wiphy,
607 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636
CL		 608#endif
609 ieee80211_release_reorder_frame(hw, tid_agg_rx,
610 j, frames);
611
612 /*
613 * Increment the head seq# also for the skipped slots.
614 */
615 tid_agg_rx->head_seq_num =
616 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
617 skipped = 0;
618 }
619 } else while (tid_agg_rx->reorder_buf[index]) {
620 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
621 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
622 tid_agg_rx->buf_size;
623 }
2bff8ebf
CL		 624
625 if (tid_agg_rx->stored_mpdu_num) {
626 j = index = seq_sub(tid_agg_rx->head_seq_num,
627 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
628
629 for (; j != (index - 1) % tid_agg_rx->buf_size;
630 j = (j + 1) % tid_agg_rx->buf_size) {
631 if (tid_agg_rx->reorder_buf[j])
632 break;
633 }
634
635 set_release_timer:
636
637 mod_timer(&tid_agg_rx->reorder_timer,
638 tid_agg_rx->reorder_time[j] +
639 HT_RX_REORDER_BUF_TIMEOUT);
640 } else {
641 del_timer(&tid_agg_rx->reorder_timer);
642 }
aa0c8636
CL		 643}
644
1edfb1af
JB		 645/*
646 * As this function belongs to the RX path it must be under
647 * rcu_read_lock protection. It returns false if the frame
648 * can be processed immediately, true if it was consumed.
649 */
650static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
651 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 652 struct sk_buff *skb,
653 struct sk_buff_head *frames)
1edfb1af
JB		 654{
655 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
656 u16 sc = le16_to_cpu(hdr->seq_ctrl);
657 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
658 u16 head_seq_num, buf_size;
659 int index;
2bff8ebf 660 bool ret = true;
1edfb1af
JB		 661
662 buf_size = tid_agg_rx->buf_size;
663 head_seq_num = tid_agg_rx->head_seq_num;
664
2bff8ebf 665 spin_lock(&tid_agg_rx->reorder_lock);
1edfb1af
JB		 666 /* frame with out of date sequence number */
667 if (seq_less(mpdu_seq_num, head_seq_num)) {
668 dev_kfree_skb(skb);
2bff8ebf 669 goto out;
1edfb1af
JB		 670 }
671
672 /*
673 * If frame the sequence number exceeds our buffering window
674 * size release some previous frames to make room for this one.
675 */
676 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
677 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
678 /* release stored frames up to new head to stack */
2569a826
JB		 679 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
680 frames);
1edfb1af
JB		 681 }
682
683 /* Now the new frame is always in the range of the reordering buffer */
684
685 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
686
687 /* check if we already stored this frame */
688 if (tid_agg_rx->reorder_buf[index]) {
689 dev_kfree_skb(skb);
2bff8ebf 690 goto out;
1edfb1af
JB		 691 }
692
693 /*
694 * If the current MPDU is in the right order and nothing else
695 * is stored we can process it directly, no need to buffer it.
696 */
697 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
698 tid_agg_rx->stored_mpdu_num == 0) {
699 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 700 ret = false;
701 goto out;
1edfb1af
JB		 702 }
703
704 /* put the frame in the reordering buffer */
705 tid_agg_rx->reorder_buf[index] = skb;
706 tid_agg_rx->reorder_time[index] = jiffies;
707 tid_agg_rx->stored_mpdu_num++;
aa0c8636 708 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
1edfb1af 709
2bff8ebf
CL		 710 out:
711 spin_unlock(&tid_agg_rx->reorder_lock);
712 return ret;
1edfb1af
JB		 713}
714
715/*
716 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
717 * true if the MPDU was buffered, false if it should be processed.
718 */
2569a826
JB		 719static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
720 struct sk_buff_head *frames)
1edfb1af 721{
2569a826
JB		 722 struct sk_buff *skb = rx->skb;
723 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 724 struct ieee80211_hw *hw = &local->hw;
725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 726 struct sta_info *sta = rx->sta;
1edfb1af
JB		 727 struct tid_ampdu_rx *tid_agg_rx;
728 u16 sc;
729 int tid;
730
731 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 732 goto dont_reorder;
1edfb1af
JB		 733
734 /*
735 * filter the QoS data rx stream according to
736 * STA/TID and check if this STA/TID is on aggregation
737 */
738
1edfb1af 739 if (!sta)
2569a826 740 goto dont_reorder;
1edfb1af
JB		 741
742 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
743
a87f736d
JB		 744 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
745 if (!tid_agg_rx)
746 goto dont_reorder;
1edfb1af
JB		 747
748 /* qos null data frames are excluded */
749 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 750 goto dont_reorder;
1edfb1af
JB		 751
752 /* new, potentially un-ordered, ampdu frame - process it */
753
754 /* reset session timer */
755 if (tid_agg_rx->timeout)
756 mod_timer(&tid_agg_rx->session_timer,
757 TU_TO_EXP_TIME(tid_agg_rx->timeout));
758
759 /* if this mpdu is fragmented - terminate rx aggregation session */
760 sc = le16_to_cpu(hdr->seq_ctrl);
761 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 762 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 763 skb_queue_tail(&rx->sdata->skb_queue, skb);
764 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 765 return;
1edfb1af
JB		 766 }
767
a87f736d
JB		 768 /*
769 * No locking needed -- we will only ever process one
770 * RX packet at a time, and thus own tid_agg_rx. All
771 * other code manipulating it needs to (and does) make
772 * sure that we cannot get to it any more before doing
773 * anything with it.
774 */
775 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
2569a826
JB		 776 return;
777
778 dont_reorder:
779 __skb_queue_tail(frames, skb);
1edfb1af 780}
33b64eb2 781
49461622 782static ieee80211_rx_result debug_noinline
5cf121c3 783ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 784{
a7767f95 785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 786
787 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
788 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 789 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 790 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 791 hdr->seq_ctrl)) {
5cf121c3 792 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 793 rx->local->dot11FrameDuplicateCount++;
794 rx->sta->num_duplicates++;
795 }
e4c26add 796 return RX_DROP_MONITOR;
571ecf67 797 } else
5cf121c3 798 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 799 }
800
571ecf67
JB		 801 if (unlikely(rx->skb->len < 16)) {
802 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 803 return RX_DROP_MONITOR;
571ecf67
JB		 804 }
805
571ecf67
JB		 806 /* Drop disallowed frame classes based on STA auth/assoc state;
807 * IEEE 802.11, Chap 5.5.
808 *
ccd7b362
JB		 809 * mac80211 filters only based on association state, i.e. it drops
810 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 811 * deauth/disassoc frames when needed. In addition, hostapd is
812 * responsible for filtering on both auth and assoc states.
813 */
33b64eb2 814
902acc78 815 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 816 return ieee80211_rx_mesh_check(rx);
33b64eb2 817
a7767f95
HH		 818 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
819 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 820 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 821 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 822 if ((!ieee80211_has_fromds(hdr->frame_control) &&
823 !ieee80211_has_tods(hdr->frame_control) &&
824 ieee80211_is_data(hdr->frame_control)) ||
825 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 826 /* Drop IBSS frames and frames for other hosts
827 * silently. */
e4c26add 828 return RX_DROP_MONITOR;
571ecf67
JB		 829 }
830
e4c26add 831 return RX_DROP_MONITOR;
571ecf67
JB		 832 }
833
9ae54c84 834 return RX_CONTINUE;
570bd537
JB		 835}
836
837
49461622 838static ieee80211_rx_result debug_noinline
5cf121c3 839ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 840{
eb9fb5b8
JB		 841 struct sk_buff *skb = rx->skb;
842 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
843 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 844 int keyidx;
845 int hdrlen;
e4c26add 846 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 847 struct ieee80211_key *stakey = NULL;
3cfcf6ac 848 int mmie_keyidx = -1;
761ab470 849 __le16 fc;
570bd537 850
3017b80b
JB		 851 /*
852 * Key selection 101
853 *
3cfcf6ac 854 * There are four types of keys:
3017b80b 855 * - GTK (group keys)
3cfcf6ac 856 * - IGTK (group keys for management frames)
3017b80b
JB		 857 * - PTK (pairwise keys)
858 * - STK (station-to-station pairwise keys)
859 *
860 * When selecting a key, we have to distinguish between multicast
861 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 862 * use PTKs and STKs while the former always use GTKs and IGTKs.
863 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
864 * unicast frames can also use key indices like GTKs. Hence, if we
865 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 866 *
8dc06a1c
JB		 867 * Note that in a regular BSS, multicast frames are sent by the
868 * AP only, associated stations unicast the frame to the AP first
869 * which then multicasts it on their behalf.
870 *
3017b80b
JB		 871 * There is also a slight problem in IBSS mode: GTKs are negotiated
872 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 873 * The spec seems to expect that one negotiates the same key with
874 * every station but there's no such requirement; VLANs could be
875 * possible.
3017b80b
JB		 876 */
877
3017b80b 878 /*
1990af8d 879 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 880 * addressed to us nor a multicast frame.
881 */
5cf121c3 882 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 883 return RX_CONTINUE;
3017b80b 884
2569a826
JB		 885 /* start without a key */
886 rx->key = NULL;
887
d4e46a3d
JB		 888 if (rx->sta)
889 stakey = rcu_dereference(rx->sta->key);
890
761ab470
JB		 891 fc = hdr->frame_control;
892
893 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 894 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
895
d4e46a3d
JB		 896 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
897 rx->key = stakey;
dc1580dd
JB		 898 if ((status->flag & RX_FLAG_DECRYPTED) &&
899 (status->flag & RX_FLAG_IV_STRIPPED))
900 return RX_CONTINUE;
0c7c10c7 901 /* Skip decryption if the frame is not protected. */
761ab470 902 if (!ieee80211_has_protected(fc))
0c7c10c7 903 return RX_CONTINUE;
3cfcf6ac
JM		 904 } else if (mmie_keyidx >= 0) {
905 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 906 if ((status->flag & RX_FLAG_DECRYPTED) &&
907 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 908 return RX_CONTINUE;
909
910 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
911 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
912 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
913 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 914 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 915 /*
916 * The frame was not protected, so skip decryption. However, we
917 * need to set rx->key if there is a key that could have been
918 * used so that the frame may be dropped if encryption would
919 * have been expected.
920 */
921 struct ieee80211_key *key = NULL;
761ab470 922 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 923 is_multicast_ether_addr(hdr->addr1) &&
924 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
925 rx->key = key;
926 else if ((key = rcu_dereference(rx->sdata->default_key)))
927 rx->key = key;
928 return RX_CONTINUE;
571ecf67 929 } else {
39184b15 930 u8 keyid;
3017b80b
JB		 931 /*
932 * The device doesn't give us the IV so we won't be
933 * able to look up the key. That's ok though, we
934 * don't need to decrypt the frame, we just won't
935 * be able to keep statistics accurate.
936 * Except for key threshold notifications, should
937 * we somehow allow the driver to tell us which key
938 * the hardware used if this flag is set?
939 */
eb9fb5b8
JB		 940 if ((status->flag & RX_FLAG_DECRYPTED) &&
941 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 942 return RX_CONTINUE;
3017b80b 943
761ab470 944 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 945
946 if (rx->skb->len < 8 + hdrlen)
e4c26add 947 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 948
949 /*
950 * no need to call ieee80211_wep_get_keyidx,
951 * it verifies a bunch of things we've done already
952 */
39184b15
ZY		 953 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
954 keyidx = keyid >> 6;
3017b80b 955
d4e46a3d 956 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 957
958 /*
959 * RSNA-protected unicast frames should always be sent with
960 * pairwise or station-to-station keys, but for WEP we allow
961 * using a key index as well.
962 */
97359d12
JB		 963 if (rx->key && rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
964 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
3017b80b
JB		 965 !is_multicast_ether_addr(hdr->addr1))
966 rx->key = NULL;
571ecf67
JB		 967 }
968
3017b80b 969 if (rx->key) {
571ecf67 970 rx->key->tx_rx_count++;
011bfcc4 971 /* TODO: add threshold stuff again */
1990af8d 972 } else {
e4c26add 973 return RX_DROP_MONITOR;
70f08765
JB		 974 }
975
39184b15
ZY		 976 if (skb_linearize(rx->skb))
977 return RX_DROP_UNUSABLE;
761ab470 978 /* the hdr variable is invalid now! */
1990af8d 979
97359d12
JB		 980 switch (rx->key->conf.cipher) {
981 case WLAN_CIPHER_SUITE_WEP40:
982 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 983 /* Check for weak IVs if possible */
984 if (rx->sta && ieee80211_is_data(fc) &&
985 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
986 !(status->flag & RX_FLAG_DECRYPTED)) &&
987 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
988 rx->sta->wep_weak_iv_count++;
989
e2f036da
MN		 990 result = ieee80211_crypto_wep_decrypt(rx);
991 break;
97359d12 992 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 993 result = ieee80211_crypto_tkip_decrypt(rx);
994 break;
97359d12 995 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 996 result = ieee80211_crypto_ccmp_decrypt(rx);
997 break;
97359d12 998 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 999 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1000 break;
3ffc2a90
JB		 1001 default:
1002 /*
1003 * We can reach here only with HW-only algorithms
1004 * but why didn't it decrypt the frame?!
1005 */
1006 return RX_DROP_UNUSABLE;
70f08765
JB		 1007 }
1008
e2f036da 1009 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1010 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1011
1012 return result;
70f08765
JB		 1013}
1014
572e0012
KV		 1015static ieee80211_rx_result debug_noinline
1016ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1017{
1018 struct ieee80211_local *local;
1019 struct ieee80211_hdr *hdr;
1020 struct sk_buff *skb;
1021
1022 local = rx->local;
1023 skb = rx->skb;
1024 hdr = (struct ieee80211_hdr *) skb->data;
1025
1026 if (!local->pspolling)
1027 return RX_CONTINUE;
1028
1029 if (!ieee80211_has_fromds(hdr->frame_control))
1030 /* this is not from AP */
1031 return RX_CONTINUE;
1032
1033 if (!ieee80211_is_data(hdr->frame_control))
1034 return RX_CONTINUE;
1035
1036 if (!ieee80211_has_moredata(hdr->frame_control)) {
1037 /* AP has no more frames buffered for us */
1038 local->pspolling = false;
1039 return RX_CONTINUE;
1040 }
1041
1042 /* more data bit is set, let's request a new frame from the AP */
1043 ieee80211_send_pspoll(local, rx->sdata);
1044
1045 return RX_CONTINUE;
1046}
1047
133b8226 1048static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1049{
133b8226 1050 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1051 struct ieee80211_local *local = sdata->local;
0795af57 1052
3e122be0 1053 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1054 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1055 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1056#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1057 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1058 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1059#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1060}
1061
ff9458d3 1062static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1063{
133b8226 1064 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1065
3e122be0 1066 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1067
af818581 1068 clear_sta_flags(sta, WLAN_STA_PS_STA);
004c872e 1069
571ecf67 1070#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1071 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1072 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1073#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1074
af818581 1075 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1076#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1077 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1078 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1079#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1080 return;
1081 }
1082
1083 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1084}
1085
49461622 1086static ieee80211_rx_result debug_noinline
5cf121c3 1087ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1088{
1089 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1090 struct sk_buff *skb = rx->skb;
1091 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1092 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1093
1094 if (!sta)
9ae54c84 1095 return RX_CONTINUE;
571ecf67 1096
b291ba11
JB		 1097 /*
1098 * Update last_rx only for IBSS packets which are for the current
1099 * BSSID to avoid keeping the current IBSS network alive in cases
1100 * where other STAs start using different BSSID.
1101 */
05c914fe 1102 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1103 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1104 NL80211_IFTYPE_ADHOC);
46900298 1105 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1106 sta->last_rx = jiffies;
b291ba11
JB		 1107 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1108 /*
33b64eb2
LCC		 1109 * Mesh beacons will update last_rx when if they are found to
1110 * match the current local configuration when processed.
571ecf67 1111 */
b291ba11 1112 sta->last_rx = jiffies;
571ecf67
JB		 1113 }
1114
5cf121c3 1115 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1116 return RX_CONTINUE;
571ecf67 1117
3cf335d5
KV		 1118 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1119 ieee80211_sta_rx_notify(rx->sdata, hdr);
1120
571ecf67
JB		 1121 sta->rx_fragments++;
1122 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1123 sta->last_signal = status->signal;
571ecf67 1124
72eaa43a
JB		 1125 /*
1126 * Change STA power saving mode only at the end of a frame
1127 * exchange sequence.
1128 */
3e122be0 1129 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 1130 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1131 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1132 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1133 /*
1134 * Ignore doze->wake transitions that are
1135 * indicated by non-data frames, the standard
1136 * is unclear here, but for example going to
1137 * PS mode and then scanning would cause a
1138 * doze->wake transition for the probe request,
1139 * and that is clearly undesirable.
1140 */
1141 if (ieee80211_is_data(hdr->frame_control) &&
1142 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1143 ap_sta_ps_end(sta);
72eaa43a
JB		 1144 } else {
1145 if (ieee80211_has_pm(hdr->frame_control))
1146 ap_sta_ps_start(sta);
1147 }
571ecf67
JB		 1148 }
1149
22403def
JB		 1150 /*
1151 * Drop (qos-)data::nullfunc frames silently, since they
1152 * are used only to control station power saving mode.
1153 */
1154 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1155 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1156 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1157
1158 /*
1159 * If we receive a 4-addr nullfunc frame from a STA
1160 * that was not moved to a 4-addr STA vlan yet, drop
1161 * the frame to the monitor interface, to make sure
1162 * that hostapd sees it
1163 */
1164 if (ieee80211_has_a4(hdr->frame_control) &&
1165 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1166 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1167 !rx->sdata->u.vlan.sta)))
1168 return RX_DROP_MONITOR;
22403def
JB		 1169 /*
1170 * Update counter and free packet here to avoid
1171 * counting this as a dropped packed.
1172 */
571ecf67
JB		 1173 sta->rx_packets++;
1174 dev_kfree_skb(rx->skb);
9ae54c84 1175 return RX_QUEUED;
571ecf67
JB		 1176 }
1177
9ae54c84 1178 return RX_CONTINUE;
571ecf67
JB		 1179} /* ieee80211_rx_h_sta_process */
1180
571ecf67
JB		 1181static inline struct ieee80211_fragment_entry *
1182ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1183 unsigned int frag, unsigned int seq, int rx_queue,
1184 struct sk_buff **skb)
1185{
1186 struct ieee80211_fragment_entry *entry;
1187 int idx;
1188
1189 idx = sdata->fragment_next;
1190 entry = &sdata->fragments[sdata->fragment_next++];
1191 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1192 sdata->fragment_next = 0;
1193
1194 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1195#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1196 struct ieee80211_hdr *hdr =
1197 (struct ieee80211_hdr *) entry->skb_list.next->data;
1198 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1199 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1200 "addr1=%pM addr2=%pM\n",
47846c9b 1201 sdata->name, idx,
571ecf67 1202 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1203 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1204#endif
571ecf67
JB		 1205 __skb_queue_purge(&entry->skb_list);
1206 }
1207
1208 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1209 *skb = NULL;
1210 entry->first_frag_time = jiffies;
1211 entry->seq = seq;
1212 entry->rx_queue = rx_queue;
1213 entry->last_frag = frag;
1214 entry->ccmp = 0;
1215 entry->extra_len = 0;
1216
1217 return entry;
1218}
1219
1220static inline struct ieee80211_fragment_entry *
1221ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1222 unsigned int frag, unsigned int seq,
571ecf67
JB		 1223 int rx_queue, struct ieee80211_hdr *hdr)
1224{
1225 struct ieee80211_fragment_entry *entry;
1226 int i, idx;
1227
1228 idx = sdata->fragment_next;
1229 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1230 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1231
1232 idx--;
1233 if (idx < 0)
1234 idx = IEEE80211_FRAGMENT_MAX - 1;
1235
1236 entry = &sdata->fragments[idx];
1237 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1238 entry->rx_queue != rx_queue ||
1239 entry->last_frag + 1 != frag)
1240 continue;
1241
b73d70ad 1242 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1243
b73d70ad
HH		 1244 /*
1245 * Check ftype and addresses are equal, else check next fragment
1246 */
1247 if (((hdr->frame_control ^ f_hdr->frame_control) &
1248 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1249 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1250 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1251 continue;
1252
ab46623e 1253 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1254 __skb_queue_purge(&entry->skb_list);
1255 continue;
1256 }
1257 return entry;
1258 }
1259
1260 return NULL;
1261}
1262
49461622 1263static ieee80211_rx_result debug_noinline
5cf121c3 1264ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1265{
1266 struct ieee80211_hdr *hdr;
1267 u16 sc;
358c8d9d 1268 __le16 fc;
571ecf67
JB		 1269 unsigned int frag, seq;
1270 struct ieee80211_fragment_entry *entry;
1271 struct sk_buff *skb;
1272
b73d70ad 1273 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1274 fc = hdr->frame_control;
571ecf67
JB		 1275 sc = le16_to_cpu(hdr->seq_ctrl);
1276 frag = sc & IEEE80211_SCTL_FRAG;
1277
358c8d9d 1278 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1279 (rx->skb)->len < 24 ||
1280 is_multicast_ether_addr(hdr->addr1))) {
1281 /* not fragmented */
1282 goto out;
1283 }
1284 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1285
e3cf8b3f
ZY		 1286 if (skb_linearize(rx->skb))
1287 return RX_DROP_UNUSABLE;
1288
058897a4
AK		 1289 /*
1290 * skb_linearize() might change the skb->data and
1291 * previously cached variables (in this case, hdr) need to
1292 * be refreshed with the new data.
1293 */
1294 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1295 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1296
1297 if (frag == 0) {
1298 /* This is the first fragment of a new frame. */
1299 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1300 rx->queue, &(rx->skb));
97359d12 1301 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1302 ieee80211_has_protected(fc)) {
9190252c
JM		 1303 int queue = ieee80211_is_mgmt(fc) ?
1304 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1305 /* Store CCMP PN so that we can verify that the next
1306 * fragment has a sequential PN value. */
1307 entry->ccmp = 1;
1308 memcpy(entry->last_pn,
9190252c 1309 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1310 CCMP_PN_LEN);
1311 }
9ae54c84 1312 return RX_QUEUED;
571ecf67
JB		 1313 }
1314
1315 /* This is a fragment for a frame that should already be pending in
1316 * fragment cache. Add this fragment to the end of the pending entry.
1317 */
b73d70ad 1318 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1319 if (!entry) {
1320 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1321 return RX_DROP_MONITOR;
571ecf67
JB		 1322 }
1323
1324 /* Verify that MPDUs within one MSDU have sequential PN values.
1325 * (IEEE 802.11i, 8.3.3.4.5) */
1326 if (entry->ccmp) {
1327 int i;
1328 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1329 int queue;
97359d12 1330 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1331 return RX_DROP_UNUSABLE;
571ecf67
JB		 1332 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1333 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1334 pn[i]++;
1335 if (pn[i])
1336 break;
1337 }
9190252c
JM		 1338 queue = ieee80211_is_mgmt(fc) ?
1339 NUM_RX_DATA_QUEUES : rx->queue;
1340 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1341 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1342 return RX_DROP_UNUSABLE;
571ecf67
JB		 1343 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1344 }
1345
358c8d9d 1346 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1347 __skb_queue_tail(&entry->skb_list, rx->skb);
1348 entry->last_frag = frag;
1349 entry->extra_len += rx->skb->len;
358c8d9d 1350 if (ieee80211_has_morefrags(fc)) {
571ecf67 1351 rx->skb = NULL;
9ae54c84 1352 return RX_QUEUED;
571ecf67
JB		 1353 }
1354
1355 rx->skb = __skb_dequeue(&entry->skb_list);
1356 if (skb_tailroom(rx->skb) < entry->extra_len) {
1357 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1358 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1359 GFP_ATOMIC))) {
1360 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1361 __skb_queue_purge(&entry->skb_list);
e4c26add 1362 return RX_DROP_UNUSABLE;
571ecf67
JB		 1363 }
1364 }
1365 while ((skb = __skb_dequeue(&entry->skb_list))) {
1366 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1367 dev_kfree_skb(skb);
1368 }
1369
1370 /* Complete frame has been reassembled - process it now */
5cf121c3 1371 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1372
1373 out:
1374 if (rx->sta)
1375 rx->sta->rx_packets++;
1376 if (is_multicast_ether_addr(hdr->addr1))
1377 rx->local->dot11MulticastReceivedFrameCount++;
1378 else
1379 ieee80211_led_rx(rx->local);
9ae54c84 1380 return RX_CONTINUE;
571ecf67
JB		 1381}
1382
49461622 1383static ieee80211_rx_result debug_noinline
5cf121c3 1384ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1385{
af818581 1386 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1387 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1388
358c8d9d 1389 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1390 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1391 return RX_CONTINUE;
571ecf67 1392
05c914fe
JB		 1393 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1394 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1395 return RX_DROP_UNUSABLE;
98f0b0a3 1396
af818581
JB		 1397 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1398 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1399 else
1400 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1401
9ae54c84 1402 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1403 * count as an dropped frame. */
1404 dev_kfree_skb(rx->skb);
1405
9ae54c84 1406 return RX_QUEUED;
571ecf67
JB		 1407}
1408
49461622 1409static ieee80211_rx_result debug_noinline
5cf121c3 1410ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1411{
6e0d114d 1412 u8 *data = rx->skb->data;
238f74a2 1413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1414
238f74a2 1415 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1416 return RX_CONTINUE;
6e0d114d
JB		 1417
1418 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1419 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1420 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1421 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1422 /* change frame type to non QOS */
238f74a2 1423 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1424
9ae54c84 1425 return RX_CONTINUE;
6e0d114d
JB		 1426}
1427
76ee65bf 1428static int
5cf121c3 1429ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1430{
07346f81 1431 if (unlikely(!rx->sta ||
f4ea83dd 1432 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1433 return -EACCES;
571ecf67 1434
76ee65bf 1435 return 0;
571ecf67
JB		 1436}
1437
76ee65bf 1438static int
358c8d9d 1439ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1440{
eb9fb5b8
JB		 1441 struct sk_buff *skb = rx->skb;
1442 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1443
3017b80b 1444 /*
7848ba7d
JB		 1445 * Pass through unencrypted frames if the hardware has
1446 * decrypted them already.
3017b80b 1447 */
eb9fb5b8 1448 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1449 return 0;
571ecf67
JB		 1450
1451 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1452 if (unlikely(!ieee80211_has_protected(fc) &&
1453 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1454 ieee80211_is_data(fc) &&
b3fc9c6c 1455 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1456 return -EACCES;
bef5d1c7
JB		 1457
1458 return 0;
1459}
1460
1461static int
1462ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1463{
1464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1465 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1466 __le16 fc = hdr->frame_control;
bef5d1c7 1467
e3efca0a
JM		 1468 /*
1469 * Pass through unencrypted frames if the hardware has
1470 * decrypted them already.
1471 */
1472 if (status->flag & RX_FLAG_DECRYPTED)
1473 return 0;
bef5d1c7 1474
f2ca3ea4 1475 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1476 if (unlikely(!ieee80211_has_protected(fc) &&
1477 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
f2ca3ea4
JM		 1478 rx->key))
1479 return -EACCES;
1480 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1481 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
fa83a218 1482 ieee80211_get_mmie_keyidx(rx->skb) < 0))
f2ca3ea4
JM		 1483 return -EACCES;
1484 /*
1485 * When using MFP, Action frames are not allowed prior to
1486 * having configured keys.
1487 */
1488 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1489 ieee80211_is_robust_mgmt_frame(
1490 (struct ieee80211_hdr *) rx->skb->data)))
1491 return -EACCES;
1492 }
b3fc9c6c 1493
76ee65bf 1494 return 0;
571ecf67
JB		 1495}
1496
76ee65bf 1497static int
e31a16d6 1498__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1499{
eb9fb5b8 1500 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee
FF		 1501 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1502
9bc383de
JB		 1503 if (ieee80211_has_a4(hdr->frame_control) &&
1504 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1505 return -1;
9bc383de
JB		 1506
1507 if (is_multicast_ether_addr(hdr->addr1) &&
1508 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1509 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
f14543ee 1510 return -1;
571ecf67 1511
47846c9b 1512 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
76ee65bf 1513}
571ecf67 1514
ce3edf6d
JB		 1515/*
1516 * requires that rx->skb is a frame with ethernet header
1517 */
358c8d9d 1518static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1519{
c97c23e3 1520 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1521 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1522 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1523
1524 /*
1525 * Allow EAPOL frames to us/the PAE group address regardless
1526 * of whether the frame was encrypted or not.
1527 */
a621fa4d 1528 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1529 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1530 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1531 return true;
1532
1533 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1534 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1535 return false;
1536
1537 return true;
1538}
1539
1540/*
1541 * requires that rx->skb is a frame with ethernet header
1542 */
76ee65bf 1543static void
5cf121c3 1544ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1545{
eb9fb5b8
JB		 1546 struct ieee80211_sub_if_data *sdata = rx->sdata;
1547 struct net_device *dev = sdata->dev;
76ee65bf 1548 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1549 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1550 struct sta_info *dsta;
571ecf67 1551
76ee65bf
RR		 1552 skb = rx->skb;
1553 xmit_skb = NULL;
571ecf67 1554
05c914fe
JB		 1555 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1556 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1557 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de
JB		 1558 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1559 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1560 if (is_multicast_ether_addr(ehdr->h_dest)) {
1561 /*
1562 * send multicast frames both to higher layers in
1563 * local net stack and back to the wireless medium
1564 */
76ee65bf
RR		 1565 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1566 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1567 printk(KERN_DEBUG "%s: failed to clone "
1568 "multicast frame\n", dev->name);
1569 } else {
abe60632
JB		 1570 dsta = sta_info_get(sdata, skb->data);
1571 if (dsta) {
ce3edf6d
JB		 1572 /*
1573 * The destination station is associated to
1574 * this AP (in this VLAN), so send the frame
1575 * directly to it and do not pass it to local
1576 * net stack.
571ecf67 1577 */
76ee65bf 1578 xmit_skb = skb;
571ecf67
JB		 1579 skb = NULL;
1580 }
571ecf67
JB		 1581 }
1582 }
1583
1584 if (skb) {
d1c3a37c
JB		 1585 int align __maybe_unused;
1586
59d9cb07 1587#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1588 /*
1589 * 'align' will only take the values 0 or 2 here
1590 * since all frames are required to be aligned
1591 * to 2-byte boundaries when being passed to
1592 * mac80211. That also explains the __skb_push()
1593 * below.
1594 */
dacb6f1d 1595 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1596 if (align) {
1597 if (WARN_ON(skb_headroom(skb) < 3)) {
1598 dev_kfree_skb(skb);
1599 skb = NULL;
1600 } else {
1601 u8 *data = skb->data;
8ce0b589
ZY		 1602 size_t len = skb_headlen(skb);
1603 skb->data -= align;
1604 memmove(skb->data, data, len);
1605 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1606 }
1607 }
1608#endif
1609
1610 if (skb) {
1611 /* deliver to local stack */
1612 skb->protocol = eth_type_trans(skb, dev);
1613 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1614 netif_receive_skb(skb);
d1c3a37c 1615 }
571ecf67
JB		 1616 }
1617
76ee65bf 1618 if (xmit_skb) {
571ecf67 1619 /* send to wireless media */
f831e909 1620 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1621 skb_reset_network_header(xmit_skb);
1622 skb_reset_mac_header(xmit_skb);
76ee65bf 1623 dev_queue_xmit(xmit_skb);
571ecf67 1624 }
76ee65bf
RR		 1625}
1626
49461622 1627static ieee80211_rx_result debug_noinline
5cf121c3 1628ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1629{
eb9fb5b8 1630 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1631 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1633 __le16 fc = hdr->frame_control;
eaf85ca7 1634 struct sk_buff_head frame_list;
fd4c7f2f 1635
358c8d9d 1636 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1637 return RX_CONTINUE;
fd4c7f2f 1638
358c8d9d 1639 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1640 return RX_DROP_MONITOR;
fd4c7f2f 1641
5cf121c3 1642 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1643 return RX_CONTINUE;
fd4c7f2f 1644
eaf85ca7
ZY		 1645 if (ieee80211_has_a4(hdr->frame_control) &&
1646 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1647 !rx->sdata->u.vlan.sta)
e4c26add 1648 return RX_DROP_UNUSABLE;
fd4c7f2f 1649
eaf85ca7
ZY		 1650 if (is_multicast_ether_addr(hdr->addr1) &&
1651 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1652 rx->sdata->u.vlan.sta) ||
1653 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1654 rx->sdata->u.mgd.use_4addr)))
e4c26add 1655 return RX_DROP_UNUSABLE;
fd4c7f2f 1656
eaf85ca7
ZY		 1657 skb->dev = dev;
1658 __skb_queue_head_init(&frame_list);
fd4c7f2f 1659
e3cf8b3f
ZY		 1660 if (skb_linearize(skb))
1661 return RX_DROP_UNUSABLE;
1662
eaf85ca7
ZY		 1663 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1664 rx->sdata->vif.type,
1665 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1666
eaf85ca7
ZY		 1667 while (!skb_queue_empty(&frame_list)) {
1668 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1669
358c8d9d 1670 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1671 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1672 continue;
1673 }
eaf85ca7
ZY		 1674 dev->stats.rx_packets++;
1675 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1676
1677 ieee80211_deliver_skb(rx);
1678 }
1679
9ae54c84 1680 return RX_QUEUED;
fd4c7f2f
RR		 1681}
1682
bf94e17b 1683#ifdef CONFIG_MAC80211_MESH
b0dee578 1684static ieee80211_rx_result
e32f85f7
LCC		 1685ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1686{
1687 struct ieee80211_hdr *hdr;
1688 struct ieee80211s_hdr *mesh_hdr;
1689 unsigned int hdrlen;
1690 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1691 struct ieee80211_local *local = rx->local;
eb9fb5b8 1692 struct ieee80211_sub_if_data *sdata = rx->sdata;
e32f85f7
LCC		 1693
1694 hdr = (struct ieee80211_hdr *) skb->data;
1695 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1696 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1697
1698 if (!ieee80211_is_data(hdr->frame_control))
1699 return RX_CONTINUE;
1700
1701 if (!mesh_hdr->ttl)
1702 /* illegal frame */
1703 return RX_DROP_MONITOR;
1704
43b7b314 1705 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1706 struct mesh_path *mppath;
43b7b314
JC		 1707 char *proxied_addr;
1708 char *mpp_addr;
1709
1710 if (is_multicast_ether_addr(hdr->addr1)) {
1711 mpp_addr = hdr->addr3;
1712 proxied_addr = mesh_hdr->eaddr1;
1713 } else {
1714 mpp_addr = hdr->addr4;
1715 proxied_addr = mesh_hdr->eaddr2;
1716 }
79617dee 1717
79617dee 1718 rcu_read_lock();
43b7b314 1719 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1720 if (!mppath) {
43b7b314 1721 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1722 } else {
1723 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1724 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1725 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1726 spin_unlock_bh(&mppath->state_lock);
1727 }
1728 rcu_read_unlock();
1729 }
1730
3c5772a5
JC		 1731 /* Frame has reached destination. Don't forward */
1732 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1733 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1734 return RX_CONTINUE;
1735
1736 mesh_hdr->ttl--;
1737
1738 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1739 if (!mesh_hdr->ttl)
472dbc45 1740 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1741 dropped_frames_ttl);
1742 else {
1743 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1744 struct ieee80211_tx_info *info;
1745
e32f85f7
LCC		 1746 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1747
1748 if (!fwd_skb && net_ratelimit())
1749 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1750 sdata->name);
e32f85f7
LCC		 1751
1752 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1753 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1754 info = IEEE80211_SKB_CB(fwd_skb);
1755 memset(info, 0, sizeof(*info));
1756 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1757 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1758 skb_set_queue_mapping(skb,
1759 ieee80211_select_queue(rx->sdata, fwd_skb));
1760 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1761 if (is_multicast_ether_addr(fwd_hdr->addr1))
1762 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1763 fwded_mcast);
1764 else {
3c5772a5
JC		 1765 int err;
1766 /*
1767 * Save TA to addr1 to send TA a path error if a
1768 * suitable next hop is not found
1769 */
1770 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1771 ETH_ALEN);
3c5772a5 1772 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1773 /* Failed to immediately resolve next hop:
1774 * fwded frame was dropped or will be added
1775 * later to the pending skb queue. */
1776 if (err)
1777 return RX_DROP_MONITOR;
c8a61a7d
DW		 1778
1779 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1780 fwded_unicast);
249b405c
JC		 1781 }
1782 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1783 fwded_frames);
3b8d81e0 1784 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1785 }
1786 }
1787
3c5772a5 1788 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1789 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1790 return RX_CONTINUE;
1791 else
1792 return RX_DROP_MONITOR;
1793}
bf94e17b 1794#endif
e32f85f7 1795
49461622 1796static ieee80211_rx_result debug_noinline
5cf121c3 1797ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1798{
eb9fb5b8 1799 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1800 struct ieee80211_local *local = rx->local;
eb9fb5b8 1801 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1803 __le16 fc = hdr->frame_control;
ce3edf6d 1804 int err;
76ee65bf 1805
358c8d9d 1806 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1807 return RX_CONTINUE;
76ee65bf 1808
358c8d9d 1809 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1810 return RX_DROP_MONITOR;
76ee65bf 1811
f14543ee
FF		 1812 /*
1813 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1814 * that a 4-addr station can be detected and moved into a separate VLAN
1815 */
1816 if (ieee80211_has_a4(hdr->frame_control) &&
1817 sdata->vif.type == NL80211_IFTYPE_AP)
1818 return RX_DROP_MONITOR;
1819
e31a16d6 1820 err = __ieee80211_data_to_8023(rx);
76ee65bf 1821 if (unlikely(err))
e4c26add 1822 return RX_DROP_UNUSABLE;
76ee65bf 1823
358c8d9d 1824 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1825 return RX_DROP_MONITOR;
ce3edf6d 1826
76ee65bf
RR		 1827 rx->skb->dev = dev;
1828
1829 dev->stats.rx_packets++;
1830 dev->stats.rx_bytes += rx->skb->len;
1831
e15276a4
VN		 1832 if (ieee80211_is_data(hdr->frame_control) &&
1833 !is_multicast_ether_addr(hdr->addr1) &&
1834 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1835 mod_timer(&local->dynamic_ps_timer, jiffies +
1836 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1837 }
1838
76ee65bf 1839 ieee80211_deliver_skb(rx);
571ecf67 1840
9ae54c84 1841 return RX_QUEUED;
571ecf67
JB		 1842}
1843
49461622 1844static ieee80211_rx_result debug_noinline
2569a826 1845ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716
RR		 1846{
1847 struct ieee80211_local *local = rx->local;
1848 struct ieee80211_hw *hw = &local->hw;
1849 struct sk_buff *skb = rx->skb;
a7767f95 1850 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1851 struct tid_ampdu_rx *tid_agg_rx;
1852 u16 start_seq_num;
1853 u16 tid;
1854
a7767f95 1855 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1856 return RX_CONTINUE;
71364716 1857
a7767f95 1858 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1859 struct {
1860 __le16 control, start_seq_num;
1861 } __packed bar_data;
1862
71364716 1863 if (!rx->sta)
a02ae758 1864 return RX_DROP_MONITOR;
8ae5977f
JB		 1865
1866 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1867 &bar_data, sizeof(bar_data)))
1868 return RX_DROP_MONITOR;
1869
8ae5977f 1870 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1871
1872 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1873 if (!tid_agg_rx)
a02ae758 1874 return RX_DROP_MONITOR;
71364716 1875
8ae5977f 1876 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1877
1878 /* reset session timer */
20ad19d0
JB		 1879 if (tid_agg_rx->timeout)
1880 mod_timer(&tid_agg_rx->session_timer,
1881 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1882
a02ae758 1883 /* release stored frames up to start of BAR */
2569a826
JB		 1884 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1885 frames);
a02ae758
JB		 1886 kfree_skb(skb);
1887 return RX_QUEUED;
71364716
RR		 1888 }
1889
08daecae
JB		 1890 /*
1891 * After this point, we only want management frames,
1892 * so we can drop all remaining control frames to
1893 * cooked monitor interfaces.
1894 */
1895 return RX_DROP_MONITOR;
71364716
RR		 1896}
1897
f4f727a6
JM		 1898static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1899 struct ieee80211_mgmt *mgmt,
1900 size_t len)
fea14732
JM		 1901{
1902 struct ieee80211_local *local = sdata->local;
1903 struct sk_buff *skb;
1904 struct ieee80211_mgmt *resp;
1905
47846c9b 1906 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 1907 /* Not to own unicast address */
1908 return;
1909 }
1910
46900298
JB		 1911 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1912 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1913 /* Not from the current AP or not associated yet. */
fea14732
JM		 1914 return;
1915 }
1916
1917 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1918 /* Too short SA Query request frame */
1919 return;
1920 }
1921
1922 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1923 if (skb == NULL)
1924 return;
1925
1926 skb_reserve(skb, local->hw.extra_tx_headroom);
1927 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1928 memset(resp, 0, 24);
1929 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 1930 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 1931 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1932 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1933 IEEE80211_STYPE_ACTION);
1934 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1935 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1936 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1937 memcpy(resp->u.action.u.sa_query.trans_id,
1938 mgmt->u.action.u.sa_query.trans_id,
1939 WLAN_SA_QUERY_TR_ID_LEN);
1940
62ae67be 1941 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 1942}
1943
2e161f78
JB		 1944static ieee80211_rx_result debug_noinline
1945ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1946{
1947 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1948
1949 /*
1950 * From here on, look only at management frames.
1951 * Data and control frames are already handled,
1952 * and unknown (reserved) frames are useless.
1953 */
1954 if (rx->skb->len < 24)
1955 return RX_DROP_MONITOR;
1956
1957 if (!ieee80211_is_mgmt(mgmt->frame_control))
1958 return RX_DROP_MONITOR;
1959
1960 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1961 return RX_DROP_MONITOR;
1962
1963 if (ieee80211_drop_unencrypted_mgmt(rx))
1964 return RX_DROP_UNUSABLE;
1965
1966 return RX_CONTINUE;
1967}
1968
de1ede7a
JB		 1969static ieee80211_rx_result debug_noinline
1970ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1971{
1972 struct ieee80211_local *local = rx->local;
eb9fb5b8 1973 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a
JB		 1974 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1975 int len = rx->skb->len;
1976
1977 if (!ieee80211_is_action(mgmt->frame_control))
1978 return RX_CONTINUE;
1979
026331c4
JM		 1980 /* drop too small frames */
1981 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 1982 return RX_DROP_UNUSABLE;
de1ede7a 1983
026331c4 1984 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 1985 return RX_DROP_UNUSABLE;
de1ede7a 1986
026331c4 1987 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
84040805 1988 return RX_DROP_UNUSABLE;
97ebe12a 1989
de1ede7a
JB		 1990 switch (mgmt->u.action.category) {
1991 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1992 /*
1993 * The aggregation code is not prepared to handle
1994 * anything but STA/AP due to the BSSID handling;
1995 * IBSS could work in the code but isn't supported
1996 * by drivers or the standard.
1997 */
1998 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1999 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2000 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2001 break;
8abd3f9b 2002
026331c4
JM		 2003 /* verify action_code is present */
2004 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2005 break;
2006
de1ede7a
JB		 2007 switch (mgmt->u.action.u.addba_req.action_code) {
2008 case WLAN_ACTION_ADDBA_REQ:
2009 if (len < (IEEE80211_MIN_ACTION_SIZE +
2010 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2011 goto invalid;
2012 break;
de1ede7a
JB		 2013 case WLAN_ACTION_ADDBA_RESP:
2014 if (len < (IEEE80211_MIN_ACTION_SIZE +
2015 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2016 goto invalid;
2017 break;
de1ede7a
JB		 2018 case WLAN_ACTION_DELBA:
2019 if (len < (IEEE80211_MIN_ACTION_SIZE +
2020 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2021 goto invalid;
2022 break;
2023 default:
2024 goto invalid;
de1ede7a 2025 }
bed7ee6e 2026
8b58ff83 2027 goto queue;
39192c0b
JB		 2028 case WLAN_CATEGORY_SPECTRUM_MGMT:
2029 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2030 break;
46900298
JB		 2031
2032 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2033 break;
46900298 2034
026331c4
JM		 2035 /* verify action_code is present */
2036 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2037 break;
2038
39192c0b
JB		 2039 switch (mgmt->u.action.u.measurement.action_code) {
2040 case WLAN_ACTION_SPCT_MSR_REQ:
2041 if (len < (IEEE80211_MIN_ACTION_SIZE +
2042 sizeof(mgmt->u.action.u.measurement)))
84040805 2043 break;
39192c0b 2044 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2045 goto handled;
c481ec97
S		 2046 case WLAN_ACTION_SPCT_CHL_SWITCH:
2047 if (len < (IEEE80211_MIN_ACTION_SIZE +
2048 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2049 break;
c481ec97 2050
cc32abd4 2051 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2052 break;
cc32abd4 2053
46900298 2054 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2055 break;
c481ec97 2056
8b58ff83 2057 goto queue;
39192c0b
JB		 2058 }
2059 break;
fea14732
JM		 2060 case WLAN_CATEGORY_SA_QUERY:
2061 if (len < (IEEE80211_MIN_ACTION_SIZE +
2062 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2063 break;
2064
fea14732
JM		 2065 switch (mgmt->u.action.u.sa_query.action) {
2066 case WLAN_ACTION_SA_QUERY_REQUEST:
2067 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2068 break;
fea14732 2069 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2070 goto handled;
fea14732
JM		 2071 }
2072 break;
97ad9139
JC		 2073 case WLAN_CATEGORY_MESH_PLINK:
2074 case WLAN_CATEGORY_MESH_PATH_SEL:
77a121c3
JB		 2075 if (!ieee80211_vif_is_mesh(&sdata->vif))
2076 break;
8b58ff83 2077 goto queue;
84040805 2078 }
026331c4 2079
2e161f78
JB		 2080 return RX_CONTINUE;
2081
bed7ee6e 2082 invalid:
2e161f78
JB		 2083 rx->flags |= IEEE80211_MALFORMED_ACTION_FRM;
2084 /* will return in the next handlers */
2085 return RX_CONTINUE;
2086
2087 handled:
2088 if (rx->sta)
2089 rx->sta->rx_packets++;
2090 dev_kfree_skb(rx->skb);
2091 return RX_QUEUED;
2092
2093 queue:
2094 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2095 skb_queue_tail(&sdata->skb_queue, rx->skb);
2096 ieee80211_queue_work(&local->hw, &sdata->work);
2097 if (rx->sta)
2098 rx->sta->rx_packets++;
2099 return RX_QUEUED;
2100}
2101
2102static ieee80211_rx_result debug_noinline
2103ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2104{
2105 struct ieee80211_rx_status *status;
2106
2107 /* skip known-bad action frames and return them in the next handler */
2108 if (rx->flags & IEEE80211_MALFORMED_ACTION_FRM)
2109 return RX_CONTINUE;
d7907448 2110
026331c4
JM		 2111 /*
2112 * Getting here means the kernel doesn't know how to handle
2113 * it, but maybe userspace does ... include returned frames
2114 * so userspace can register for those to know whether ones
2115 * it transmitted were processed or returned.
2116 */
2117 status = IEEE80211_SKB_RXCB(rx->skb);
2118
2e161f78
JB		 2119 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2120 rx->skb->data, rx->skb->len,
2121 GFP_ATOMIC)) {
2122 if (rx->sta)
2123 rx->sta->rx_packets++;
2124 dev_kfree_skb(rx->skb);
2125 return RX_QUEUED;
2126 }
2127
2128
2129 return RX_CONTINUE;
2130}
2131
2132static ieee80211_rx_result debug_noinline
2133ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2134{
2135 struct ieee80211_local *local = rx->local;
2136 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2137 struct sk_buff *nskb;
2138 struct ieee80211_sub_if_data *sdata = rx->sdata;
2139
2140 if (!ieee80211_is_action(mgmt->frame_control))
2141 return RX_CONTINUE;
2142
2143 /*
2144 * For AP mode, hostapd is responsible for handling any action
2145 * frames that we didn't handle, including returning unknown
2146 * ones. For all other modes we will return them to the sender,
2147 * setting the 0x80 bit in the action category, as required by
2148 * 802.11-2007 7.3.1.11.
2149 * Newer versions of hostapd shall also use the management frame
2150 * registration mechanisms, but older ones still use cooked
2151 * monitor interfaces so push all frames there.
2152 */
2153 if (!(rx->flags & IEEE80211_MALFORMED_ACTION_FRM) &&
2154 (sdata->vif.type == NL80211_IFTYPE_AP ||
2155 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2156 return RX_DROP_MONITOR;
026331c4 2157
84040805
JB		 2158 /* do not return rejected action frames */
2159 if (mgmt->u.action.category & 0x80)
2160 return RX_DROP_UNUSABLE;
2161
2162 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2163 GFP_ATOMIC);
2164 if (nskb) {
292b4df6 2165 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2166
292b4df6
JL		 2167 nmgmt->u.action.category |= 0x80;
2168 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2169 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2170
2171 memset(nskb->cb, 0, sizeof(nskb->cb));
2172
2173 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2174 }
39192c0b
JB		 2175 dev_kfree_skb(rx->skb);
2176 return RX_QUEUED;
de1ede7a
JB		 2177}
2178
49461622 2179static ieee80211_rx_result debug_noinline
5cf121c3 2180ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2181{
eb9fb5b8 2182 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2183 ieee80211_rx_result rxs;
77a121c3
JB		 2184 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2185 __le16 stype;
571ecf67 2186
af6b6374
JB		 2187 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2188 if (rxs != RX_CONTINUE)
2189 return rxs;
2190
77a121c3 2191 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2192
77a121c3
JB		 2193 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2194 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2195 sdata->vif.type != NL80211_IFTYPE_STATION)
2196 return RX_DROP_MONITOR;
472dbc45 2197
77a121c3
JB		 2198 switch (stype) {
2199 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2200 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2201 /* process for all: mesh, mlme, ibss */
2202 break;
2203 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2204 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2205 /* process only for station */
2206 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2207 return RX_DROP_MONITOR;
2208 break;
2209 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2210 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2211 /* process only for ibss */
2212 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2213 return RX_DROP_MONITOR;
2214 break;
2215 default:
2216 return RX_DROP_MONITOR;
2217 }
f9d540ee 2218
77a121c3 2219 /* queue up frame and kick off work to process it */
c1475ca9 2220 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2221 skb_queue_tail(&sdata->skb_queue, rx->skb);
2222 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2223 if (rx->sta)
2224 rx->sta->rx_packets++;
46900298 2225
77a121c3 2226 return RX_QUEUED;
571ecf67
JB		 2227}
2228
3b8d81e0 2229static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2230 struct ieee80211_rx_data *rx)
571ecf67 2231{
a7767f95
HH		 2232 int keyidx;
2233 unsigned int hdrlen;
571ecf67 2234
a7767f95 2235 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2236 if (rx->skb->len >= hdrlen + 4)
2237 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2238 else
2239 keyidx = -1;
2240
8944b79f 2241 if (!rx->sta) {
aa0daf0e
JB		 2242 /*
2243 * Some hardware seem to generate incorrect Michael MIC
2244 * reports; ignore them to avoid triggering countermeasures.
2245 */
af2ced6a 2246 return;
571ecf67
JB		 2247 }
2248
a7767f95 2249 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2250 return;
571ecf67 2251
05c914fe 2252 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2253 /*
2254 * APs with pairwise keys should never receive Michael MIC
2255 * errors for non-zero keyidx because these are reserved for
2256 * group keys and only the AP is sending real multicast
2257 * frames in the BSS.
2258 */
af2ced6a 2259 return;
571ecf67
JB		 2260 }
2261
a7767f95
HH		 2262 if (!ieee80211_is_data(hdr->frame_control) &&
2263 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2264 return;
571ecf67 2265
e6d6e342
JB		 2266 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2267 GFP_ATOMIC);
571ecf67
JB		 2268}
2269
5cf121c3 2270/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2271static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2272 struct ieee80211_rate *rate)
3d30d949
MW		 2273{
2274 struct ieee80211_sub_if_data *sdata;
2275 struct ieee80211_local *local = rx->local;
2276 struct ieee80211_rtap_hdr {
2277 struct ieee80211_radiotap_header hdr;
2278 u8 flags;
5f0b7de5 2279 u8 rate_or_pad;
3d30d949
MW		 2280 __le16 chan_freq;
2281 __le16 chan_flags;
bc10502d 2282 } __packed *rthdr;
3d30d949
MW		 2283 struct sk_buff *skb = rx->skb, *skb2;
2284 struct net_device *prev_dev = NULL;
eb9fb5b8 2285 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2286
7c1e1831
JL		 2287 if (status->flag & RX_FLAG_INTERNAL_CMTR)
2288 goto out_free_skb;
2289
3d30d949
MW		 2290 if (skb_headroom(skb) < sizeof(*rthdr) &&
2291 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2292 goto out_free_skb;
2293
2294 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2295 memset(rthdr, 0, sizeof(*rthdr));
2296 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2297 rthdr->hdr.it_present =
2298 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2299 (1 << IEEE80211_RADIOTAP_CHANNEL));
2300
5f0b7de5
JB		 2301 if (rate) {
2302 rthdr->rate_or_pad = rate->bitrate / 5;
2303 rthdr->hdr.it_present |=
2304 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2305 }
3d30d949
MW		 2306 rthdr->chan_freq = cpu_to_le16(status->freq);
2307
2308 if (status->band == IEEE80211_BAND_5GHZ)
2309 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2310 IEEE80211_CHAN_5GHZ);
2311 else
2312 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2313 IEEE80211_CHAN_2GHZ);
2314
2315 skb_set_mac_header(skb, 0);
2316 skb->ip_summed = CHECKSUM_UNNECESSARY;
2317 skb->pkt_type = PACKET_OTHERHOST;
2318 skb->protocol = htons(ETH_P_802_2);
2319
2320 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2321 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2322 continue;
2323
05c914fe 2324 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2325 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2326 continue;
2327
2328 if (prev_dev) {
2329 skb2 = skb_clone(skb, GFP_ATOMIC);
2330 if (skb2) {
2331 skb2->dev = prev_dev;
5548a8a1 2332 netif_receive_skb(skb2);
3d30d949
MW		 2333 }
2334 }
2335
2336 prev_dev = sdata->dev;
2337 sdata->dev->stats.rx_packets++;
2338 sdata->dev->stats.rx_bytes += skb->len;
2339 }
2340
2341 if (prev_dev) {
2342 skb->dev = prev_dev;
5548a8a1 2343 netif_receive_skb(skb);
3d30d949
MW		 2344 skb = NULL;
2345 } else
2346 goto out_free_skb;
2347
7c1e1831 2348 status->flag |= RX_FLAG_INTERNAL_CMTR;
3d30d949
MW		 2349 return;
2350
2351 out_free_skb:
2352 dev_kfree_skb(skb);
2353}
2354
aa0c8636
CL		 2355static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2356 ieee80211_rx_result res)
2357{
2358 switch (res) {
2359 case RX_DROP_MONITOR:
2360 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2361 if (rx->sta)
2362 rx->sta->rx_dropped++;
2363 /* fall through */
2364 case RX_CONTINUE: {
2365 struct ieee80211_rate *rate = NULL;
2366 struct ieee80211_supported_band *sband;
2367 struct ieee80211_rx_status *status;
2368
2369 status = IEEE80211_SKB_RXCB((rx->skb));
2370
2371 sband = rx->local->hw.wiphy->bands[status->band];
2372 if (!(status->flag & RX_FLAG_HT))
2373 rate = &sband->bitrates[status->rate_idx];
2374
2375 ieee80211_rx_cooked_monitor(rx, rate);
2376 break;
2377 }
2378 case RX_DROP_UNUSABLE:
2379 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2380 if (rx->sta)
2381 rx->sta->rx_dropped++;
2382 dev_kfree_skb(rx->skb);
2383 break;
2384 case RX_QUEUED:
2385 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2386 break;
2387 }
2388}
571ecf67 2389
aa0c8636
CL		 2390static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2391 struct sk_buff_head *frames)
58905290 2392{
58905290 2393 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2394 struct sk_buff *skb;
8944b79f 2395
e32f85f7
LCC		 2396#define CALL_RXH(rxh) \
2397 do { \
2398 res = rxh(rx); \
2399 if (res != RX_CONTINUE) \
2569a826 2400 goto rxh_next; \
e32f85f7 2401 } while (0);
49461622 2402
aa0c8636 2403 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2404 /*
2405 * all the other fields are valid across frames
2406 * that belong to an aMPDU since they are on the
2407 * same TID from the same station
2408 */
2409 rx->skb = skb;
2410
2411 CALL_RXH(ieee80211_rx_h_decrypt)
2412 CALL_RXH(ieee80211_rx_h_check_more_data)
2413 CALL_RXH(ieee80211_rx_h_sta_process)
2414 CALL_RXH(ieee80211_rx_h_defragment)
2415 CALL_RXH(ieee80211_rx_h_ps_poll)
2416 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2417 /* must be after MMIC verify so header is counted in MPDU mic */
2418 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2419 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2420#ifdef CONFIG_MAC80211_MESH
aa0c8636 2421 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2422 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2423#endif
2569a826
JB		 2424 CALL_RXH(ieee80211_rx_h_data)
2425
2426 /* special treatment -- needs the queue */
aa0c8636 2427 res = ieee80211_rx_h_ctrl(rx, frames);
2569a826
JB		 2428 if (res != RX_CONTINUE)
2429 goto rxh_next;
2430
2e161f78 2431 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2432 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2433 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2434 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2435 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2436
aa0c8636
CL		 2437 rxh_next:
2438 ieee80211_rx_handlers_result(rx, res);
2439
49461622 2440#undef CALL_RXH
aa0c8636
CL		 2441 }
2442}
2443
4406c376 2444static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636
CL		 2445{
2446 struct sk_buff_head reorder_release;
2447 ieee80211_rx_result res = RX_DROP_MONITOR;
2448
2449 __skb_queue_head_init(&reorder_release);
2450
aa0c8636
CL		 2451#define CALL_RXH(rxh) \
2452 do { \
2453 res = rxh(rx); \
2454 if (res != RX_CONTINUE) \
2455 goto rxh_next; \
2456 } while (0);
2457
2458 CALL_RXH(ieee80211_rx_h_passive_scan)
2459 CALL_RXH(ieee80211_rx_h_check)
2460
2461 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2462
2463 ieee80211_rx_handlers(rx, &reorder_release);
2464 return;
49461622 2465
2569a826 2466 rxh_next:
aa0c8636
CL		 2467 ieee80211_rx_handlers_result(rx, res);
2468
2469#undef CALL_RXH
58905290
JB		 2470}
2471
2bff8ebf
CL		 2472/*
2473 * This function makes calls into the RX path. Therefore the
2474 * caller must hold the sta_info->lock and everything has to
2475 * be under rcu_read_lock protection as well.
2476 */
2477void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2478{
2479 struct sk_buff_head frames;
2480 struct ieee80211_rx_data rx = { };
2c15a0cf
CL		 2481 struct tid_ampdu_rx *tid_agg_rx;
2482
2483 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2484 if (!tid_agg_rx)
2485 return;
2bff8ebf
CL		 2486
2487 __skb_queue_head_init(&frames);
2488
2489 /* construct rx struct */
2490 rx.sta = sta;
2491 rx.sdata = sta->sdata;
2492 rx.local = sta->local;
2493 rx.queue = tid;
2494 rx.flags |= IEEE80211_RX_RA_MATCH;
2495
2c15a0cf
CL		 2496 spin_lock(&tid_agg_rx->reorder_lock);
2497 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2498 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf
CL		 2499
2500 ieee80211_rx_handlers(&rx, &frames);
2501}
2502
571ecf67
JB		 2503/* main receive path */
2504
20b01f80 2505static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2506 struct ieee80211_hdr *hdr)
2507{
20b01f80 2508 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2509 struct sk_buff *skb = rx->skb;
2510 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2511 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2512 int multicast = is_multicast_ether_addr(hdr->addr1);
2513
51fb61e7 2514 switch (sdata->vif.type) {
05c914fe 2515 case NL80211_IFTYPE_STATION:
9bc383de 2516 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2517 return 0;
77fdaa12 2518 if (!multicast &&
47846c9b 2519 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2520 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2521 return 0;
5cf121c3 2522 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2523 }
2524 break;
05c914fe 2525 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2526 if (!bssid)
2527 return 0;
a7767f95 2528 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2529 return 1;
87291c02 2530 }
46900298 2531 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
5cf121c3 2532 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2533 return 0;
5cf121c3 2534 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2535 } else if (!multicast &&
47846c9b 2536 compare_ether_addr(sdata->vif.addr,
23a24def 2537 hdr->addr1) != 0) {
4150c572 2538 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2539 return 0;
5cf121c3 2540 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2541 } else if (!rx->sta) {
2542 int rate_idx;
eb9fb5b8 2543 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2544 rate_idx = 0; /* TODO: HT rates */
2545 else
eb9fb5b8 2546 rate_idx = status->rate_idx;
34e89507
JB		 2547 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2548 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2549 }
23a24def 2550 break;
05c914fe 2551 case NL80211_IFTYPE_MESH_POINT:
6032f934 2552 if (!multicast &&
47846c9b 2553 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2554 hdr->addr1) != 0) {
2555 if (!(sdata->dev->flags & IFF_PROMISC))
2556 return 0;
2557
5cf121c3 2558 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2559 }
2560 break;
05c914fe
JB		 2561 case NL80211_IFTYPE_AP_VLAN:
2562 case NL80211_IFTYPE_AP:
23a24def 2563 if (!bssid) {
47846c9b 2564 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2565 hdr->addr1))
2566 return 0;
2567 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2568 sdata->vif.addr)) {
5cf121c3 2569 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2570 return 0;
5cf121c3 2571 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2572 }
23a24def 2573 break;
05c914fe 2574 case NL80211_IFTYPE_WDS:
a7767f95 2575 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2576 return 0;
2577 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2578 return 0;
2579 break;
2ca27bcf 2580 default:
fb1c1cd6
JB		 2581 /* should never get here */
2582 WARN_ON(1);
2583 break;
23a24def
JB		 2584 }
2585
2586 return 1;
2587}
2588
4406c376
JB		 2589/*
2590 * This function returns whether or not the SKB
2591 * was destined for RX processing or not, which,
2592 * if consume is true, is equivalent to whether
2593 * or not the skb was consumed.
2594 */
2595static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2596 struct sk_buff *skb, bool consume)
2597{
2598 struct ieee80211_local *local = rx->local;
2599 struct ieee80211_sub_if_data *sdata = rx->sdata;
2600 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2601 struct ieee80211_hdr *hdr = (void *)skb->data;
2602 int prepares;
2603
2604 rx->skb = skb;
2605 rx->flags |= IEEE80211_RX_RA_MATCH;
2606 prepares = prepare_for_handlers(rx, hdr);
2607
2608 if (!prepares)
2609 return false;
2610
2611 if (status->flag & RX_FLAG_MMIC_ERROR) {
2612 if (rx->flags & IEEE80211_RX_RA_MATCH)
2613 ieee80211_rx_michael_mic_report(hdr, rx);
2614 return false;
2615 }
2616
2617 if (!consume) {
2618 skb = skb_copy(skb, GFP_ATOMIC);
2619 if (!skb) {
2620 if (net_ratelimit())
2621 wiphy_debug(local->hw.wiphy,
2622 "failed to copy multicast frame for %s\n",
2623 sdata->name);
2624 return true;
2625 }
2626
2627 rx->skb = skb;
2628 }
2629
2630 ieee80211_invoke_rx_handlers(rx);
2631 return true;
2632}
2633
571ecf67 2634/*
6368e4b1
RR		 2635 * This is the actual Rx frames handler. as it blongs to Rx path it must
2636 * be called with rcu_read_lock protection.
571ecf67 2637 */
71ebb4aa 2638static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2639 struct sk_buff *skb)
571ecf67
JB		 2640{
2641 struct ieee80211_local *local = hw_to_local(hw);
2642 struct ieee80211_sub_if_data *sdata;
571ecf67 2643 struct ieee80211_hdr *hdr;
e3cf8b3f 2644 __le16 fc;
5cf121c3 2645 struct ieee80211_rx_data rx;
4406c376 2646 struct ieee80211_sub_if_data *prev;
56af3268 2647 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2648 int err = 0;
571ecf67 2649
e3cf8b3f 2650 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2651 memset(&rx, 0, sizeof(rx));
2652 rx.skb = skb;
2653 rx.local = local;
72abd81b 2654
e3cf8b3f 2655 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2656 local->dot11ReceivedFragmentCount++;
571ecf67 2657
142b9f50
HS		 2658 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2659 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
5cf121c3 2660 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2661
e3cf8b3f
ZY		 2662 if (ieee80211_is_mgmt(fc))
2663 err = skb_linearize(skb);
2664 else
2665 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2666
2667 if (err) {
2668 dev_kfree_skb(skb);
2669 return;
2670 }
2671
2672 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2673 ieee80211_parse_qos(&rx);
d1c3a37c 2674 ieee80211_verify_alignment(&rx);
38f3714d 2675
e3cf8b3f 2676 if (ieee80211_is_data(fc)) {
56af3268 2677 prev_sta = NULL;
4406c376 2678
abe60632 2679 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2680 if (!prev_sta) {
2681 prev_sta = sta;
2682 continue;
2683 }
2684
2685 rx.sta = prev_sta;
2686 rx.sdata = prev_sta->sdata;
4406c376 2687 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2688
56af3268 2689 prev_sta = sta;
4406c376 2690 }
56af3268
BG		 2691
2692 if (prev_sta) {
2693 rx.sta = prev_sta;
2694 rx.sdata = prev_sta->sdata;
2695
4406c376 2696 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2697 return;
56af3268 2698 }
4406c376
JB		 2699 }
2700
4b0dd98e 2701 prev = NULL;
b2e7771e 2702
4b0dd98e
JB		 2703 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2704 if (!ieee80211_sdata_running(sdata))
2705 continue;
340e11f3 2706
4b0dd98e
JB		 2707 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2708 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2709 continue;
340e11f3 2710
4b0dd98e
JB		 2711 /*
2712 * frame is destined for this interface, but if it's
2713 * not also for the previous one we handle that after
2714 * the loop to avoid copying the SKB once too much
2715 */
4bb29f8c 2716
4b0dd98e 2717 if (!prev) {
abe60632 2718 prev = sdata;
4b0dd98e 2719 continue;
340e11f3 2720 }
4bb29f8c 2721
4b0dd98e
JB		 2722 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2723 rx.sdata = prev;
2724 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2725
4b0dd98e
JB		 2726 prev = sdata;
2727 }
2728
2729 if (prev) {
2730 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2731 rx.sdata = prev;
4406c376 2732
4b0dd98e
JB		 2733 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2734 return;
571ecf67 2735 }
4406c376
JB		 2736
2737 dev_kfree_skb(skb);
571ecf67 2738}
6368e4b1
RR		 2739
2740/*
2741 * This is the receive path handler. It is called by a low level driver when an
2742 * 802.11 MPDU is received from the hardware.
2743 */
103bf9f7 2744void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2745{
2746 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2747 struct ieee80211_rate *rate = NULL;
2748 struct ieee80211_supported_band *sband;
f1d58c25 2749 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2750
d20ef63d
JB		 2751 WARN_ON_ONCE(softirq_count() == 0);
2752
77a980dc
JB		 2753 if (WARN_ON(status->band < 0 ||
2754 status->band >= IEEE80211_NUM_BANDS))
2755 goto drop;
8318d78a
JB		 2756
2757 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2758 if (WARN_ON(!sband))
2759 goto drop;
8318d78a 2760
89c3a8ac
JB		 2761 /*
2762 * If we're suspending, it is possible although not too likely
2763 * that we'd be receiving frames after having already partially
2764 * quiesced the stack. We can't process such frames then since
2765 * that might, for example, cause stations to be added or other
2766 * driver callbacks be invoked.
2767 */
77a980dc
JB		 2768 if (unlikely(local->quiescing || local->suspended))
2769 goto drop;
89c3a8ac 2770
ea77f12f
JB		 2771 /*
2772 * The same happens when we're not even started,
2773 * but that's worth a warning.
2774 */
77a980dc
JB		 2775 if (WARN_ON(!local->started))
2776 goto drop;
ea77f12f 2777
fc885189 2778 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2779 /*
fc885189
JB		 2780 * Validate the rate, unless a PLCP error means that
2781 * we probably can't have a valid rate here anyway.
e5d6eb83 2782 */
fc885189
JB		 2783
2784 if (status->flag & RX_FLAG_HT) {
2785 /*
2786 * rate_idx is MCS index, which can be [0-76]
2787 * as documented on:
2788 *
2789 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2790 *
2791 * Anything else would be some sort of driver or
2792 * hardware error. The driver should catch hardware
2793 * errors.
2794 */
2795 if (WARN((status->rate_idx < 0 ||
2796 status->rate_idx > 76),
2797 "Rate marked as an HT rate but passed "
2798 "status->rate_idx is not "
2799 "an MCS index [0-76]: %d (0x%02x)\n",
2800 status->rate_idx,
2801 status->rate_idx))
2802 goto drop;
2803 } else {
2804 if (WARN_ON(status->rate_idx < 0 ||
2805 status->rate_idx >= sband->n_bitrates))
2806 goto drop;
2807 rate = &sband->bitrates[status->rate_idx];
2808 }
0fb8ca45 2809 }
6368e4b1
RR		 2810
2811 /*
2812 * key references and virtual interfaces are protected using RCU
2813 * and this requires that we are in a read-side RCU section during
2814 * receive processing
2815 */
2816 rcu_read_lock();
2817
2818 /*
2819 * Frames with failed FCS/PLCP checksum are not returned,
2820 * all other frames are returned without radiotap header
2821 * if it was previously present.
2822 * Also, frames with less than 16 bytes are dropped.
2823 */
f1d58c25 2824 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2825 if (!skb) {
2826 rcu_read_unlock();
2827 return;
2828 }
2829
071d9ac2 2830 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2831
2832 rcu_read_unlock();
77a980dc
JB		 2833
2834 return;
2835 drop:
2836 kfree_skb(skb);
6368e4b1 2837}
103bf9f7 2838EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2839
2840/* This is a version of the rx handler that can be called from hard irq
2841 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2842void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2843{
2844 struct ieee80211_local *local = hw_to_local(hw);
2845
2846 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2847
571ecf67
JB		 2848 skb->pkt_type = IEEE80211_RX_MSG;
2849 skb_queue_tail(&local->skb_queue, skb);
2850 tasklet_schedule(&local->tasklet);
2851}
2852EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)