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[net-next-2.6.git] / net / mac80211 / rx.c
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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;
554891e6 318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 319 int tid;
320
321 /* does the frame have a qos control field? */
238f74a2
HH		 322 if (ieee80211_is_data_qos(hdr->frame_control)) {
323 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 324 /* frame has qos control */
238f74a2
HH		 325 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
326 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 327 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 328 } else {
1411f9b5
JB		 329 /*
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
331 *
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
337 *
338 * We also use that counter for non-QoS STAs.
339 */
340 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 341 }
52865dfd 342
5cf121c3 343 rx->queue = tid;
6e0d114d
JB		 344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 347}
6e0d114d 348
d1c3a37c
JB		 349/**
350 * DOC: Packet alignment
351 *
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
353 * to the stack.
354 *
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
d1c3a37c
JB		 363 *
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
369 *
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
373 */
374static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 375{
59d9cb07
KV		 376#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx->skb->data & 1,
378 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 379#endif
6e0d114d
JB		 380}
381
6368e4b1 382
571ecf67
JB		 383/* rx handlers */
384
49461622 385static ieee80211_rx_result debug_noinline
5cf121c3 386ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 387{
388 struct ieee80211_local *local = rx->local;
554891e6 389 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 390 struct sk_buff *skb = rx->skb;
391
554891e6 392 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 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 624
15943a72
CL		 625 /*
626 * Disable the reorder release timer for now.
627 *
628 * The current implementation lacks a proper locking scheme
629 * which would protect vital statistic and debug counters
630 * from being updated by two different but concurrent BHs.
631 *
632 * More information about the topic is available from:
633 * - thread: http://marc.info/?t=128635927000001
634 *
635 * What was wrong:
636 * => http://marc.info/?l=linux-wireless&m=128636170811964
637 * "Basically the thing is that until your patch, the data
638 * in the struct didn't actually need locking because it
639 * was accessed by the RX path only which is not concurrent."
640 *
641 * List of what needs to be fixed:
642 * => http://marc.info/?l=linux-wireless&m=128656352920957
643 *
644
2bff8ebf
CL		 645 if (tid_agg_rx->stored_mpdu_num) {
646 j = index = seq_sub(tid_agg_rx->head_seq_num,
647 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
648
649 for (; j != (index - 1) % tid_agg_rx->buf_size;
650 j = (j + 1) % tid_agg_rx->buf_size) {
651 if (tid_agg_rx->reorder_buf[j])
652 break;
653 }
654
655 set_release_timer:
656
657 mod_timer(&tid_agg_rx->reorder_timer,
658 tid_agg_rx->reorder_time[j] +
659 HT_RX_REORDER_BUF_TIMEOUT);
660 } else {
661 del_timer(&tid_agg_rx->reorder_timer);
662 }
15943a72
CL		 663 */
664
665set_release_timer:
666 return;
aa0c8636
CL		 667}
668
1edfb1af
JB		 669/*
670 * As this function belongs to the RX path it must be under
671 * rcu_read_lock protection. It returns false if the frame
672 * can be processed immediately, true if it was consumed.
673 */
674static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
675 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 676 struct sk_buff *skb,
677 struct sk_buff_head *frames)
1edfb1af
JB		 678{
679 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
680 u16 sc = le16_to_cpu(hdr->seq_ctrl);
681 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
682 u16 head_seq_num, buf_size;
683 int index;
2bff8ebf 684 bool ret = true;
1edfb1af
JB		 685
686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
688
2bff8ebf 689 spin_lock(&tid_agg_rx->reorder_lock);
1edfb1af
JB		 690 /* frame with out of date sequence number */
691 if (seq_less(mpdu_seq_num, head_seq_num)) {
692 dev_kfree_skb(skb);
2bff8ebf 693 goto out;
1edfb1af
JB		 694 }
695
696 /*
697 * If frame the sequence number exceeds our buffering window
698 * size release some previous frames to make room for this one.
699 */
700 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
701 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
702 /* release stored frames up to new head to stack */
2569a826
JB		 703 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
704 frames);
1edfb1af
JB		 705 }
706
707 /* Now the new frame is always in the range of the reordering buffer */
708
709 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
710
711 /* check if we already stored this frame */
712 if (tid_agg_rx->reorder_buf[index]) {
713 dev_kfree_skb(skb);
2bff8ebf 714 goto out;
1edfb1af
JB		 715 }
716
717 /*
718 * If the current MPDU is in the right order and nothing else
719 * is stored we can process it directly, no need to buffer it.
720 */
721 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
722 tid_agg_rx->stored_mpdu_num == 0) {
723 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 724 ret = false;
725 goto out;
1edfb1af
JB		 726 }
727
728 /* put the frame in the reordering buffer */
729 tid_agg_rx->reorder_buf[index] = skb;
730 tid_agg_rx->reorder_time[index] = jiffies;
731 tid_agg_rx->stored_mpdu_num++;
aa0c8636 732 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
1edfb1af 733
2bff8ebf
CL		 734 out:
735 spin_unlock(&tid_agg_rx->reorder_lock);
736 return ret;
1edfb1af
JB		 737}
738
739/*
740 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
741 * true if the MPDU was buffered, false if it should be processed.
742 */
2569a826
JB		 743static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
744 struct sk_buff_head *frames)
1edfb1af 745{
2569a826
JB		 746 struct sk_buff *skb = rx->skb;
747 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 748 struct ieee80211_hw *hw = &local->hw;
749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 750 struct sta_info *sta = rx->sta;
1edfb1af
JB		 751 struct tid_ampdu_rx *tid_agg_rx;
752 u16 sc;
753 int tid;
754
755 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 756 goto dont_reorder;
1edfb1af
JB		 757
758 /*
759 * filter the QoS data rx stream according to
760 * STA/TID and check if this STA/TID is on aggregation
761 */
762
1edfb1af 763 if (!sta)
2569a826 764 goto dont_reorder;
1edfb1af
JB		 765
766 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
767
a87f736d
JB		 768 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
769 if (!tid_agg_rx)
770 goto dont_reorder;
1edfb1af
JB		 771
772 /* qos null data frames are excluded */
773 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 774 goto dont_reorder;
1edfb1af
JB		 775
776 /* new, potentially un-ordered, ampdu frame - process it */
777
778 /* reset session timer */
779 if (tid_agg_rx->timeout)
780 mod_timer(&tid_agg_rx->session_timer,
781 TU_TO_EXP_TIME(tid_agg_rx->timeout));
782
783 /* if this mpdu is fragmented - terminate rx aggregation session */
784 sc = le16_to_cpu(hdr->seq_ctrl);
785 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 786 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 787 skb_queue_tail(&rx->sdata->skb_queue, skb);
788 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 789 return;
1edfb1af
JB		 790 }
791
a87f736d
JB		 792 /*
793 * No locking needed -- we will only ever process one
794 * RX packet at a time, and thus own tid_agg_rx. All
795 * other code manipulating it needs to (and does) make
796 * sure that we cannot get to it any more before doing
797 * anything with it.
798 */
799 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
2569a826
JB		 800 return;
801
802 dont_reorder:
803 __skb_queue_tail(frames, skb);
1edfb1af 804}
33b64eb2 805
49461622 806static ieee80211_rx_result debug_noinline
5cf121c3 807ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 808{
a7767f95 809 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 810 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 811
812 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
813 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 814 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 815 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 816 hdr->seq_ctrl)) {
554891e6 817 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 818 rx->local->dot11FrameDuplicateCount++;
819 rx->sta->num_duplicates++;
820 }
e4c26add 821 return RX_DROP_MONITOR;
571ecf67 822 } else
5cf121c3 823 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 824 }
825
571ecf67
JB		 826 if (unlikely(rx->skb->len < 16)) {
827 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 828 return RX_DROP_MONITOR;
571ecf67
JB		 829 }
830
571ecf67
JB		 831 /* Drop disallowed frame classes based on STA auth/assoc state;
832 * IEEE 802.11, Chap 5.5.
833 *
ccd7b362
JB		 834 * mac80211 filters only based on association state, i.e. it drops
835 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 836 * deauth/disassoc frames when needed. In addition, hostapd is
837 * responsible for filtering on both auth and assoc states.
838 */
33b64eb2 839
902acc78 840 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 841 return ieee80211_rx_mesh_check(rx);
33b64eb2 842
a7767f95
HH		 843 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
844 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 845 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 846 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
07346f81 847 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 848 if ((!ieee80211_has_fromds(hdr->frame_control) &&
849 !ieee80211_has_tods(hdr->frame_control) &&
850 ieee80211_is_data(hdr->frame_control)) ||
554891e6 851 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 852 /* Drop IBSS frames and frames for other hosts
853 * silently. */
e4c26add 854 return RX_DROP_MONITOR;
571ecf67
JB		 855 }
856
e4c26add 857 return RX_DROP_MONITOR;
571ecf67
JB		 858 }
859
9ae54c84 860 return RX_CONTINUE;
570bd537
JB		 861}
862
863
49461622 864static ieee80211_rx_result debug_noinline
5cf121c3 865ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 866{
eb9fb5b8
JB		 867 struct sk_buff *skb = rx->skb;
868 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
869 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 870 int keyidx;
871 int hdrlen;
e4c26add 872 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 873 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 874 int mmie_keyidx = -1;
761ab470 875 __le16 fc;
570bd537 876
3017b80b
JB		 877 /*
878 * Key selection 101
879 *
3cfcf6ac 880 * There are four types of keys:
3017b80b 881 * - GTK (group keys)
3cfcf6ac 882 * - IGTK (group keys for management frames)
3017b80b
JB		 883 * - PTK (pairwise keys)
884 * - STK (station-to-station pairwise keys)
885 *
886 * When selecting a key, we have to distinguish between multicast
887 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 888 * use PTKs and STKs while the former always use GTKs and IGTKs.
889 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
890 * unicast frames can also use key indices like GTKs. Hence, if we
891 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 892 *
8dc06a1c
JB		 893 * Note that in a regular BSS, multicast frames are sent by the
894 * AP only, associated stations unicast the frame to the AP first
895 * which then multicasts it on their behalf.
896 *
3017b80b
JB		 897 * There is also a slight problem in IBSS mode: GTKs are negotiated
898 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 899 * The spec seems to expect that one negotiates the same key with
900 * every station but there's no such requirement; VLANs could be
901 * possible.
3017b80b
JB		 902 */
903
3017b80b 904 /*
1990af8d 905 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 906 * addressed to us nor a multicast frame.
907 */
554891e6 908 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 909 return RX_CONTINUE;
3017b80b 910
2569a826
JB		 911 /* start without a key */
912 rx->key = NULL;
913
d4e46a3d 914 if (rx->sta)
e31b8213 915 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 916
761ab470
JB		 917 fc = hdr->frame_control;
918
919 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 920 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
921
e31b8213
JB		 922 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
923 rx->key = sta_ptk;
dc1580dd
JB		 924 if ((status->flag & RX_FLAG_DECRYPTED) &&
925 (status->flag & RX_FLAG_IV_STRIPPED))
926 return RX_CONTINUE;
0c7c10c7 927 /* Skip decryption if the frame is not protected. */
761ab470 928 if (!ieee80211_has_protected(fc))
0c7c10c7 929 return RX_CONTINUE;
3cfcf6ac
JM		 930 } else if (mmie_keyidx >= 0) {
931 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 932 if ((status->flag & RX_FLAG_DECRYPTED) &&
933 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 934 return RX_CONTINUE;
935
936 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
937 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
938 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 939 if (rx->sta)
940 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
941 if (!rx->key)
942 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 943 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 944 /*
945 * The frame was not protected, so skip decryption. However, we
946 * need to set rx->key if there is a key that could have been
947 * used so that the frame may be dropped if encryption would
948 * have been expected.
949 */
950 struct ieee80211_key *key = NULL;
761ab470 951 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
954 rx->key = key;
955 else if ((key = rcu_dereference(rx->sdata->default_key)))
956 rx->key = key;
957 return RX_CONTINUE;
571ecf67 958 } else {
39184b15 959 u8 keyid;
3017b80b
JB		 960 /*
961 * The device doesn't give us the IV so we won't be
962 * able to look up the key. That's ok though, we
963 * don't need to decrypt the frame, we just won't
964 * be able to keep statistics accurate.
965 * Except for key threshold notifications, should
966 * we somehow allow the driver to tell us which key
967 * the hardware used if this flag is set?
968 */
eb9fb5b8
JB		 969 if ((status->flag & RX_FLAG_DECRYPTED) &&
970 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 971 return RX_CONTINUE;
3017b80b 972
761ab470 973 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 974
975 if (rx->skb->len < 8 + hdrlen)
e4c26add 976 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 977
978 /*
979 * no need to call ieee80211_wep_get_keyidx,
980 * it verifies a bunch of things we've done already
981 */
39184b15
ZY		 982 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
983 keyidx = keyid >> 6;
3017b80b 984
e31b8213
JB		 985 /* check per-station GTK first, if multicast packet */
986 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
987 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 988
e31b8213
JB		 989 /* if not found, try default key */
990 if (!rx->key) {
991 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
992
993 /*
994 * RSNA-protected unicast frames should always be
995 * sent with pairwise or station-to-station keys,
996 * but for WEP we allow using a key index as well.
997 */
998 if (rx->key &&
999 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1000 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1001 !is_multicast_ether_addr(hdr->addr1))
1002 rx->key = NULL;
1003 }
571ecf67
JB		 1004 }
1005
3017b80b 1006 if (rx->key) {
571ecf67 1007 rx->key->tx_rx_count++;
011bfcc4 1008 /* TODO: add threshold stuff again */
1990af8d 1009 } else {
e4c26add 1010 return RX_DROP_MONITOR;
70f08765
JB		 1011 }
1012
39184b15
ZY		 1013 if (skb_linearize(rx->skb))
1014 return RX_DROP_UNUSABLE;
761ab470 1015 /* the hdr variable is invalid now! */
1990af8d 1016
97359d12
JB		 1017 switch (rx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1020 /* Check for weak IVs if possible */
1021 if (rx->sta && ieee80211_is_data(fc) &&
1022 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1023 !(status->flag & RX_FLAG_DECRYPTED)) &&
1024 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1025 rx->sta->wep_weak_iv_count++;
1026
e2f036da
MN		 1027 result = ieee80211_crypto_wep_decrypt(rx);
1028 break;
97359d12 1029 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1030 result = ieee80211_crypto_tkip_decrypt(rx);
1031 break;
97359d12 1032 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1033 result = ieee80211_crypto_ccmp_decrypt(rx);
1034 break;
97359d12 1035 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1036 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1037 break;
3ffc2a90
JB		 1038 default:
1039 /*
1040 * We can reach here only with HW-only algorithms
1041 * but why didn't it decrypt the frame?!
1042 */
1043 return RX_DROP_UNUSABLE;
70f08765
JB		 1044 }
1045
e2f036da 1046 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1047 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1048
1049 return result;
70f08765
JB		 1050}
1051
572e0012
KV		 1052static ieee80211_rx_result debug_noinline
1053ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1054{
1055 struct ieee80211_local *local;
1056 struct ieee80211_hdr *hdr;
1057 struct sk_buff *skb;
1058
1059 local = rx->local;
1060 skb = rx->skb;
1061 hdr = (struct ieee80211_hdr *) skb->data;
1062
1063 if (!local->pspolling)
1064 return RX_CONTINUE;
1065
1066 if (!ieee80211_has_fromds(hdr->frame_control))
1067 /* this is not from AP */
1068 return RX_CONTINUE;
1069
1070 if (!ieee80211_is_data(hdr->frame_control))
1071 return RX_CONTINUE;
1072
1073 if (!ieee80211_has_moredata(hdr->frame_control)) {
1074 /* AP has no more frames buffered for us */
1075 local->pspolling = false;
1076 return RX_CONTINUE;
1077 }
1078
1079 /* more data bit is set, let's request a new frame from the AP */
1080 ieee80211_send_pspoll(local, rx->sdata);
1081
1082 return RX_CONTINUE;
1083}
1084
133b8226 1085static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1086{
133b8226 1087 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1088 struct ieee80211_local *local = sdata->local;
0795af57 1089
3e122be0 1090 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1091 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1092 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1093#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1094 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1095 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1096#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1097}
1098
ff9458d3 1099static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1100{
133b8226 1101 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1102
3e122be0 1103 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1104
af818581 1105 clear_sta_flags(sta, WLAN_STA_PS_STA);
004c872e 1106
571ecf67 1107#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1108 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1109 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1110#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1111
af818581 1112 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1113#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1114 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1115 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1116#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1117 return;
1118 }
1119
1120 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1121}
1122
49461622 1123static ieee80211_rx_result debug_noinline
5cf121c3 1124ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1125{
1126 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1127 struct sk_buff *skb = rx->skb;
1128 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1129 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1130
1131 if (!sta)
9ae54c84 1132 return RX_CONTINUE;
571ecf67 1133
b291ba11
JB		 1134 /*
1135 * Update last_rx only for IBSS packets which are for the current
1136 * BSSID to avoid keeping the current IBSS network alive in cases
1137 * where other STAs start using different BSSID.
1138 */
05c914fe 1139 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1140 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1141 NL80211_IFTYPE_ADHOC);
46900298 1142 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1143 sta->last_rx = jiffies;
b291ba11
JB		 1144 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1145 /*
33b64eb2
LCC		 1146 * Mesh beacons will update last_rx when if they are found to
1147 * match the current local configuration when processed.
571ecf67 1148 */
b291ba11 1149 sta->last_rx = jiffies;
571ecf67
JB		 1150 }
1151
554891e6 1152 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1153 return RX_CONTINUE;
571ecf67 1154
3cf335d5
KV		 1155 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1156 ieee80211_sta_rx_notify(rx->sdata, hdr);
1157
571ecf67
JB		 1158 sta->rx_fragments++;
1159 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1160 sta->last_signal = status->signal;
571ecf67 1161
72eaa43a
JB		 1162 /*
1163 * Change STA power saving mode only at the end of a frame
1164 * exchange sequence.
1165 */
3e122be0 1166 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 1167 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1168 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1169 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1170 /*
1171 * Ignore doze->wake transitions that are
1172 * indicated by non-data frames, the standard
1173 * is unclear here, but for example going to
1174 * PS mode and then scanning would cause a
1175 * doze->wake transition for the probe request,
1176 * and that is clearly undesirable.
1177 */
1178 if (ieee80211_is_data(hdr->frame_control) &&
1179 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1180 ap_sta_ps_end(sta);
72eaa43a
JB		 1181 } else {
1182 if (ieee80211_has_pm(hdr->frame_control))
1183 ap_sta_ps_start(sta);
1184 }
571ecf67
JB		 1185 }
1186
22403def
JB		 1187 /*
1188 * Drop (qos-)data::nullfunc frames silently, since they
1189 * are used only to control station power saving mode.
1190 */
1191 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1192 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1193 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1194
1195 /*
1196 * If we receive a 4-addr nullfunc frame from a STA
1197 * that was not moved to a 4-addr STA vlan yet, drop
1198 * the frame to the monitor interface, to make sure
1199 * that hostapd sees it
1200 */
1201 if (ieee80211_has_a4(hdr->frame_control) &&
1202 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1203 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1204 !rx->sdata->u.vlan.sta)))
1205 return RX_DROP_MONITOR;
22403def
JB		 1206 /*
1207 * Update counter and free packet here to avoid
1208 * counting this as a dropped packed.
1209 */
571ecf67
JB		 1210 sta->rx_packets++;
1211 dev_kfree_skb(rx->skb);
9ae54c84 1212 return RX_QUEUED;
571ecf67
JB		 1213 }
1214
9ae54c84 1215 return RX_CONTINUE;
571ecf67
JB		 1216} /* ieee80211_rx_h_sta_process */
1217
571ecf67
JB		 1218static inline struct ieee80211_fragment_entry *
1219ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1220 unsigned int frag, unsigned int seq, int rx_queue,
1221 struct sk_buff **skb)
1222{
1223 struct ieee80211_fragment_entry *entry;
1224 int idx;
1225
1226 idx = sdata->fragment_next;
1227 entry = &sdata->fragments[sdata->fragment_next++];
1228 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1229 sdata->fragment_next = 0;
1230
1231 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1232#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1233 struct ieee80211_hdr *hdr =
1234 (struct ieee80211_hdr *) entry->skb_list.next->data;
1235 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1236 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1237 "addr1=%pM addr2=%pM\n",
47846c9b 1238 sdata->name, idx,
571ecf67 1239 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1240 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1241#endif
571ecf67
JB		 1242 __skb_queue_purge(&entry->skb_list);
1243 }
1244
1245 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1246 *skb = NULL;
1247 entry->first_frag_time = jiffies;
1248 entry->seq = seq;
1249 entry->rx_queue = rx_queue;
1250 entry->last_frag = frag;
1251 entry->ccmp = 0;
1252 entry->extra_len = 0;
1253
1254 return entry;
1255}
1256
1257static inline struct ieee80211_fragment_entry *
1258ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1259 unsigned int frag, unsigned int seq,
571ecf67
JB		 1260 int rx_queue, struct ieee80211_hdr *hdr)
1261{
1262 struct ieee80211_fragment_entry *entry;
1263 int i, idx;
1264
1265 idx = sdata->fragment_next;
1266 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1267 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1268
1269 idx--;
1270 if (idx < 0)
1271 idx = IEEE80211_FRAGMENT_MAX - 1;
1272
1273 entry = &sdata->fragments[idx];
1274 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1275 entry->rx_queue != rx_queue ||
1276 entry->last_frag + 1 != frag)
1277 continue;
1278
b73d70ad 1279 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1280
b73d70ad
HH		 1281 /*
1282 * Check ftype and addresses are equal, else check next fragment
1283 */
1284 if (((hdr->frame_control ^ f_hdr->frame_control) &
1285 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1286 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1287 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1288 continue;
1289
ab46623e 1290 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1291 __skb_queue_purge(&entry->skb_list);
1292 continue;
1293 }
1294 return entry;
1295 }
1296
1297 return NULL;
1298}
1299
49461622 1300static ieee80211_rx_result debug_noinline
5cf121c3 1301ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1302{
1303 struct ieee80211_hdr *hdr;
1304 u16 sc;
358c8d9d 1305 __le16 fc;
571ecf67
JB		 1306 unsigned int frag, seq;
1307 struct ieee80211_fragment_entry *entry;
1308 struct sk_buff *skb;
554891e6 1309 struct ieee80211_rx_status *status;
571ecf67 1310
b73d70ad 1311 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1312 fc = hdr->frame_control;
571ecf67
JB		 1313 sc = le16_to_cpu(hdr->seq_ctrl);
1314 frag = sc & IEEE80211_SCTL_FRAG;
1315
358c8d9d 1316 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1317 (rx->skb)->len < 24 ||
1318 is_multicast_ether_addr(hdr->addr1))) {
1319 /* not fragmented */
1320 goto out;
1321 }
1322 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1323
e3cf8b3f
ZY		 1324 if (skb_linearize(rx->skb))
1325 return RX_DROP_UNUSABLE;
1326
058897a4
AK		 1327 /*
1328 * skb_linearize() might change the skb->data and
1329 * previously cached variables (in this case, hdr) need to
1330 * be refreshed with the new data.
1331 */
1332 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1333 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1334
1335 if (frag == 0) {
1336 /* This is the first fragment of a new frame. */
1337 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1338 rx->queue, &(rx->skb));
97359d12 1339 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1340 ieee80211_has_protected(fc)) {
9190252c
JM		 1341 int queue = ieee80211_is_mgmt(fc) ?
1342 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1343 /* Store CCMP PN so that we can verify that the next
1344 * fragment has a sequential PN value. */
1345 entry->ccmp = 1;
1346 memcpy(entry->last_pn,
9190252c 1347 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1348 CCMP_PN_LEN);
1349 }
9ae54c84 1350 return RX_QUEUED;
571ecf67
JB		 1351 }
1352
1353 /* This is a fragment for a frame that should already be pending in
1354 * fragment cache. Add this fragment to the end of the pending entry.
1355 */
b73d70ad 1356 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1357 if (!entry) {
1358 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1359 return RX_DROP_MONITOR;
571ecf67
JB		 1360 }
1361
1362 /* Verify that MPDUs within one MSDU have sequential PN values.
1363 * (IEEE 802.11i, 8.3.3.4.5) */
1364 if (entry->ccmp) {
1365 int i;
1366 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1367 int queue;
97359d12 1368 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1369 return RX_DROP_UNUSABLE;
571ecf67
JB		 1370 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1371 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1372 pn[i]++;
1373 if (pn[i])
1374 break;
1375 }
9190252c
JM		 1376 queue = ieee80211_is_mgmt(fc) ?
1377 NUM_RX_DATA_QUEUES : rx->queue;
1378 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1379 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1380 return RX_DROP_UNUSABLE;
571ecf67
JB		 1381 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1382 }
1383
358c8d9d 1384 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1385 __skb_queue_tail(&entry->skb_list, rx->skb);
1386 entry->last_frag = frag;
1387 entry->extra_len += rx->skb->len;
358c8d9d 1388 if (ieee80211_has_morefrags(fc)) {
571ecf67 1389 rx->skb = NULL;
9ae54c84 1390 return RX_QUEUED;
571ecf67
JB		 1391 }
1392
1393 rx->skb = __skb_dequeue(&entry->skb_list);
1394 if (skb_tailroom(rx->skb) < entry->extra_len) {
1395 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1396 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1397 GFP_ATOMIC))) {
1398 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1399 __skb_queue_purge(&entry->skb_list);
e4c26add 1400 return RX_DROP_UNUSABLE;
571ecf67
JB		 1401 }
1402 }
1403 while ((skb = __skb_dequeue(&entry->skb_list))) {
1404 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1405 dev_kfree_skb(skb);
1406 }
1407
1408 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1409 status = IEEE80211_SKB_RXCB(rx->skb);
1410 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1411
1412 out:
1413 if (rx->sta)
1414 rx->sta->rx_packets++;
1415 if (is_multicast_ether_addr(hdr->addr1))
1416 rx->local->dot11MulticastReceivedFrameCount++;
1417 else
1418 ieee80211_led_rx(rx->local);
9ae54c84 1419 return RX_CONTINUE;
571ecf67
JB		 1420}
1421
49461622 1422static ieee80211_rx_result debug_noinline
5cf121c3 1423ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1424{
af818581 1425 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1426 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1427 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1428
358c8d9d 1429 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1430 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1431 return RX_CONTINUE;
571ecf67 1432
05c914fe
JB		 1433 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1434 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1435 return RX_DROP_UNUSABLE;
98f0b0a3 1436
af818581
JB		 1437 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1438 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1439 else
1440 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1441
9ae54c84 1442 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1443 * count as an dropped frame. */
1444 dev_kfree_skb(rx->skb);
1445
9ae54c84 1446 return RX_QUEUED;
571ecf67
JB		 1447}
1448
49461622 1449static ieee80211_rx_result debug_noinline
5cf121c3 1450ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1451{
6e0d114d 1452 u8 *data = rx->skb->data;
238f74a2 1453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1454
238f74a2 1455 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1456 return RX_CONTINUE;
6e0d114d
JB		 1457
1458 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1459 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1460 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1461 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1462 /* change frame type to non QOS */
238f74a2 1463 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1464
9ae54c84 1465 return RX_CONTINUE;
6e0d114d
JB		 1466}
1467
76ee65bf 1468static int
5cf121c3 1469ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1470{
07346f81 1471 if (unlikely(!rx->sta ||
f4ea83dd 1472 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1473 return -EACCES;
571ecf67 1474
76ee65bf 1475 return 0;
571ecf67
JB		 1476}
1477
76ee65bf 1478static int
358c8d9d 1479ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1480{
eb9fb5b8
JB		 1481 struct sk_buff *skb = rx->skb;
1482 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1483
3017b80b 1484 /*
7848ba7d
JB		 1485 * Pass through unencrypted frames if the hardware has
1486 * decrypted them already.
3017b80b 1487 */
eb9fb5b8 1488 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1489 return 0;
571ecf67
JB		 1490
1491 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1492 if (unlikely(!ieee80211_has_protected(fc) &&
1493 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1494 ieee80211_is_data(fc) &&
b3fc9c6c 1495 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1496 return -EACCES;
bef5d1c7
JB		 1497
1498 return 0;
1499}
1500
1501static int
1502ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1503{
1504 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1505 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1506 __le16 fc = hdr->frame_control;
bef5d1c7 1507
e3efca0a
JM		 1508 /*
1509 * Pass through unencrypted frames if the hardware has
1510 * decrypted them already.
1511 */
1512 if (status->flag & RX_FLAG_DECRYPTED)
1513 return 0;
bef5d1c7 1514
f2ca3ea4 1515 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1516 if (unlikely(!ieee80211_has_protected(fc) &&
1517 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
f2ca3ea4
JM		 1518 rx->key))
1519 return -EACCES;
1520 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1521 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
fa83a218 1522 ieee80211_get_mmie_keyidx(rx->skb) < 0))
f2ca3ea4
JM		 1523 return -EACCES;
1524 /*
1525 * When using MFP, Action frames are not allowed prior to
1526 * having configured keys.
1527 */
1528 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1529 ieee80211_is_robust_mgmt_frame(
1530 (struct ieee80211_hdr *) rx->skb->data)))
1531 return -EACCES;
1532 }
b3fc9c6c 1533
76ee65bf 1534 return 0;
571ecf67
JB		 1535}
1536
76ee65bf 1537static int
e31a16d6 1538__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1539{
eb9fb5b8 1540 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee
FF		 1541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1542
9bc383de
JB		 1543 if (ieee80211_has_a4(hdr->frame_control) &&
1544 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1545 return -1;
9bc383de
JB		 1546
1547 if (is_multicast_ether_addr(hdr->addr1) &&
1548 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1549 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
f14543ee 1550 return -1;
571ecf67 1551
47846c9b 1552 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
76ee65bf 1553}
571ecf67 1554
ce3edf6d
JB		 1555/*
1556 * requires that rx->skb is a frame with ethernet header
1557 */
358c8d9d 1558static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1559{
c97c23e3 1560 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1561 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1562 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1563
1564 /*
1565 * Allow EAPOL frames to us/the PAE group address regardless
1566 * of whether the frame was encrypted or not.
1567 */
a621fa4d 1568 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1569 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1570 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1571 return true;
1572
1573 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1574 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1575 return false;
1576
1577 return true;
1578}
1579
1580/*
1581 * requires that rx->skb is a frame with ethernet header
1582 */
76ee65bf 1583static void
5cf121c3 1584ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1585{
eb9fb5b8
JB		 1586 struct ieee80211_sub_if_data *sdata = rx->sdata;
1587 struct net_device *dev = sdata->dev;
76ee65bf 1588 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1589 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1590 struct sta_info *dsta;
554891e6 1591 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1592
76ee65bf
RR		 1593 skb = rx->skb;
1594 xmit_skb = NULL;
571ecf67 1595
05c914fe
JB		 1596 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1597 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1598 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1599 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1600 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1601 if (is_multicast_ether_addr(ehdr->h_dest)) {
1602 /*
1603 * send multicast frames both to higher layers in
1604 * local net stack and back to the wireless medium
1605 */
76ee65bf
RR		 1606 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1607 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1608 printk(KERN_DEBUG "%s: failed to clone "
1609 "multicast frame\n", dev->name);
1610 } else {
abe60632
JB		 1611 dsta = sta_info_get(sdata, skb->data);
1612 if (dsta) {
ce3edf6d
JB		 1613 /*
1614 * The destination station is associated to
1615 * this AP (in this VLAN), so send the frame
1616 * directly to it and do not pass it to local
1617 * net stack.
571ecf67 1618 */
76ee65bf 1619 xmit_skb = skb;
571ecf67
JB		 1620 skb = NULL;
1621 }
571ecf67
JB		 1622 }
1623 }
1624
1625 if (skb) {
d1c3a37c
JB		 1626 int align __maybe_unused;
1627
59d9cb07 1628#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1629 /*
1630 * 'align' will only take the values 0 or 2 here
1631 * since all frames are required to be aligned
1632 * to 2-byte boundaries when being passed to
1633 * mac80211. That also explains the __skb_push()
1634 * below.
1635 */
dacb6f1d 1636 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1637 if (align) {
1638 if (WARN_ON(skb_headroom(skb) < 3)) {
1639 dev_kfree_skb(skb);
1640 skb = NULL;
1641 } else {
1642 u8 *data = skb->data;
8ce0b589
ZY		 1643 size_t len = skb_headlen(skb);
1644 skb->data -= align;
1645 memmove(skb->data, data, len);
1646 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1647 }
1648 }
1649#endif
1650
1651 if (skb) {
1652 /* deliver to local stack */
1653 skb->protocol = eth_type_trans(skb, dev);
1654 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1655 netif_receive_skb(skb);
d1c3a37c 1656 }
571ecf67
JB		 1657 }
1658
76ee65bf 1659 if (xmit_skb) {
571ecf67 1660 /* send to wireless media */
f831e909 1661 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1662 skb_reset_network_header(xmit_skb);
1663 skb_reset_mac_header(xmit_skb);
76ee65bf 1664 dev_queue_xmit(xmit_skb);
571ecf67 1665 }
76ee65bf
RR		 1666}
1667
49461622 1668static ieee80211_rx_result debug_noinline
5cf121c3 1669ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1670{
eb9fb5b8 1671 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1672 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1673 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1674 __le16 fc = hdr->frame_control;
eaf85ca7 1675 struct sk_buff_head frame_list;
554891e6 1676 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1677
358c8d9d 1678 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1679 return RX_CONTINUE;
fd4c7f2f 1680
358c8d9d 1681 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1682 return RX_DROP_MONITOR;
fd4c7f2f 1683
554891e6 1684 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1685 return RX_CONTINUE;
fd4c7f2f 1686
eaf85ca7
ZY		 1687 if (ieee80211_has_a4(hdr->frame_control) &&
1688 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1689 !rx->sdata->u.vlan.sta)
e4c26add 1690 return RX_DROP_UNUSABLE;
fd4c7f2f 1691
eaf85ca7
ZY		 1692 if (is_multicast_ether_addr(hdr->addr1) &&
1693 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1694 rx->sdata->u.vlan.sta) ||
1695 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1696 rx->sdata->u.mgd.use_4addr)))
e4c26add 1697 return RX_DROP_UNUSABLE;
fd4c7f2f 1698
eaf85ca7
ZY		 1699 skb->dev = dev;
1700 __skb_queue_head_init(&frame_list);
fd4c7f2f 1701
e3cf8b3f
ZY		 1702 if (skb_linearize(skb))
1703 return RX_DROP_UNUSABLE;
1704
eaf85ca7
ZY		 1705 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1706 rx->sdata->vif.type,
1707 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1708
eaf85ca7
ZY		 1709 while (!skb_queue_empty(&frame_list)) {
1710 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1711
358c8d9d 1712 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1713 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1714 continue;
1715 }
eaf85ca7
ZY		 1716 dev->stats.rx_packets++;
1717 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1718
1719 ieee80211_deliver_skb(rx);
1720 }
1721
9ae54c84 1722 return RX_QUEUED;
fd4c7f2f
RR		 1723}
1724
bf94e17b 1725#ifdef CONFIG_MAC80211_MESH
b0dee578 1726static ieee80211_rx_result
e32f85f7
LCC		 1727ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1728{
1729 struct ieee80211_hdr *hdr;
1730 struct ieee80211s_hdr *mesh_hdr;
1731 unsigned int hdrlen;
1732 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1733 struct ieee80211_local *local = rx->local;
eb9fb5b8 1734 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1735 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1736
1737 hdr = (struct ieee80211_hdr *) skb->data;
1738 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1739 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1740
1741 if (!ieee80211_is_data(hdr->frame_control))
1742 return RX_CONTINUE;
1743
1744 if (!mesh_hdr->ttl)
1745 /* illegal frame */
1746 return RX_DROP_MONITOR;
1747
43b7b314 1748 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1749 struct mesh_path *mppath;
43b7b314
JC		 1750 char *proxied_addr;
1751 char *mpp_addr;
1752
1753 if (is_multicast_ether_addr(hdr->addr1)) {
1754 mpp_addr = hdr->addr3;
1755 proxied_addr = mesh_hdr->eaddr1;
1756 } else {
1757 mpp_addr = hdr->addr4;
1758 proxied_addr = mesh_hdr->eaddr2;
1759 }
79617dee 1760
79617dee 1761 rcu_read_lock();
43b7b314 1762 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1763 if (!mppath) {
43b7b314 1764 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1765 } else {
1766 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1767 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1768 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1769 spin_unlock_bh(&mppath->state_lock);
1770 }
1771 rcu_read_unlock();
1772 }
1773
3c5772a5
JC		 1774 /* Frame has reached destination. Don't forward */
1775 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1776 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1777 return RX_CONTINUE;
1778
1779 mesh_hdr->ttl--;
1780
554891e6 1781 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1782 if (!mesh_hdr->ttl)
472dbc45 1783 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1784 dropped_frames_ttl);
1785 else {
1786 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1787 struct ieee80211_tx_info *info;
1788
e32f85f7
LCC		 1789 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1790
1791 if (!fwd_skb && net_ratelimit())
1792 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1793 sdata->name);
e32f85f7
LCC		 1794
1795 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1796 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1797 info = IEEE80211_SKB_CB(fwd_skb);
1798 memset(info, 0, sizeof(*info));
1799 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1800 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1801 skb_set_queue_mapping(skb,
1802 ieee80211_select_queue(rx->sdata, fwd_skb));
1803 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1804 if (is_multicast_ether_addr(fwd_hdr->addr1))
1805 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1806 fwded_mcast);
1807 else {
3c5772a5
JC		 1808 int err;
1809 /*
1810 * Save TA to addr1 to send TA a path error if a
1811 * suitable next hop is not found
1812 */
1813 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1814 ETH_ALEN);
3c5772a5 1815 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1816 /* Failed to immediately resolve next hop:
1817 * fwded frame was dropped or will be added
1818 * later to the pending skb queue. */
1819 if (err)
1820 return RX_DROP_MONITOR;
c8a61a7d
DW		 1821
1822 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1823 fwded_unicast);
249b405c
JC		 1824 }
1825 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1826 fwded_frames);
3b8d81e0 1827 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1828 }
1829 }
1830
3c5772a5 1831 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1832 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1833 return RX_CONTINUE;
1834 else
1835 return RX_DROP_MONITOR;
1836}
bf94e17b 1837#endif
e32f85f7 1838
49461622 1839static ieee80211_rx_result debug_noinline
5cf121c3 1840ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1841{
eb9fb5b8 1842 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1843 struct ieee80211_local *local = rx->local;
eb9fb5b8 1844 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1846 __le16 fc = hdr->frame_control;
ce3edf6d 1847 int err;
76ee65bf 1848
358c8d9d 1849 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1850 return RX_CONTINUE;
76ee65bf 1851
358c8d9d 1852 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1853 return RX_DROP_MONITOR;
76ee65bf 1854
f14543ee
FF		 1855 /*
1856 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1857 * that a 4-addr station can be detected and moved into a separate VLAN
1858 */
1859 if (ieee80211_has_a4(hdr->frame_control) &&
1860 sdata->vif.type == NL80211_IFTYPE_AP)
1861 return RX_DROP_MONITOR;
1862
e31a16d6 1863 err = __ieee80211_data_to_8023(rx);
76ee65bf 1864 if (unlikely(err))
e4c26add 1865 return RX_DROP_UNUSABLE;
76ee65bf 1866
358c8d9d 1867 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1868 return RX_DROP_MONITOR;
ce3edf6d 1869
76ee65bf
RR		 1870 rx->skb->dev = dev;
1871
1872 dev->stats.rx_packets++;
1873 dev->stats.rx_bytes += rx->skb->len;
1874
e15276a4
VN		 1875 if (ieee80211_is_data(hdr->frame_control) &&
1876 !is_multicast_ether_addr(hdr->addr1) &&
1877 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1878 mod_timer(&local->dynamic_ps_timer, jiffies +
1879 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1880 }
1881
76ee65bf 1882 ieee80211_deliver_skb(rx);
571ecf67 1883
9ae54c84 1884 return RX_QUEUED;
571ecf67
JB		 1885}
1886
49461622 1887static ieee80211_rx_result debug_noinline
2569a826 1888ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716
RR		 1889{
1890 struct ieee80211_local *local = rx->local;
1891 struct ieee80211_hw *hw = &local->hw;
1892 struct sk_buff *skb = rx->skb;
a7767f95 1893 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1894 struct tid_ampdu_rx *tid_agg_rx;
1895 u16 start_seq_num;
1896 u16 tid;
1897
a7767f95 1898 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1899 return RX_CONTINUE;
71364716 1900
a7767f95 1901 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1902 struct {
1903 __le16 control, start_seq_num;
1904 } __packed bar_data;
1905
71364716 1906 if (!rx->sta)
a02ae758 1907 return RX_DROP_MONITOR;
8ae5977f
JB		 1908
1909 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1910 &bar_data, sizeof(bar_data)))
1911 return RX_DROP_MONITOR;
1912
8ae5977f 1913 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1914
1915 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1916 if (!tid_agg_rx)
a02ae758 1917 return RX_DROP_MONITOR;
71364716 1918
8ae5977f 1919 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1920
1921 /* reset session timer */
20ad19d0
JB		 1922 if (tid_agg_rx->timeout)
1923 mod_timer(&tid_agg_rx->session_timer,
1924 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1925
a02ae758 1926 /* release stored frames up to start of BAR */
2569a826
JB		 1927 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1928 frames);
a02ae758
JB		 1929 kfree_skb(skb);
1930 return RX_QUEUED;
71364716
RR		 1931 }
1932
08daecae
JB		 1933 /*
1934 * After this point, we only want management frames,
1935 * so we can drop all remaining control frames to
1936 * cooked monitor interfaces.
1937 */
1938 return RX_DROP_MONITOR;
71364716
RR		 1939}
1940
f4f727a6
JM		 1941static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1942 struct ieee80211_mgmt *mgmt,
1943 size_t len)
fea14732
JM		 1944{
1945 struct ieee80211_local *local = sdata->local;
1946 struct sk_buff *skb;
1947 struct ieee80211_mgmt *resp;
1948
47846c9b 1949 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 1950 /* Not to own unicast address */
1951 return;
1952 }
1953
46900298
JB		 1954 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1955 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1956 /* Not from the current AP or not associated yet. */
fea14732
JM		 1957 return;
1958 }
1959
1960 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1961 /* Too short SA Query request frame */
1962 return;
1963 }
1964
1965 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1966 if (skb == NULL)
1967 return;
1968
1969 skb_reserve(skb, local->hw.extra_tx_headroom);
1970 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1971 memset(resp, 0, 24);
1972 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 1973 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 1974 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1975 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1976 IEEE80211_STYPE_ACTION);
1977 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1978 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1979 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1980 memcpy(resp->u.action.u.sa_query.trans_id,
1981 mgmt->u.action.u.sa_query.trans_id,
1982 WLAN_SA_QUERY_TR_ID_LEN);
1983
62ae67be 1984 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 1985}
1986
2e161f78
JB		 1987static ieee80211_rx_result debug_noinline
1988ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1989{
1990 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 1991 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 1992
1993 /*
1994 * From here on, look only at management frames.
1995 * Data and control frames are already handled,
1996 * and unknown (reserved) frames are useless.
1997 */
1998 if (rx->skb->len < 24)
1999 return RX_DROP_MONITOR;
2000
2001 if (!ieee80211_is_mgmt(mgmt->frame_control))
2002 return RX_DROP_MONITOR;
2003
554891e6 2004 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2005 return RX_DROP_MONITOR;
2006
2007 if (ieee80211_drop_unencrypted_mgmt(rx))
2008 return RX_DROP_UNUSABLE;
2009
2010 return RX_CONTINUE;
2011}
2012
de1ede7a
JB		 2013static ieee80211_rx_result debug_noinline
2014ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2015{
2016 struct ieee80211_local *local = rx->local;
eb9fb5b8 2017 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2018 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2019 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2020 int len = rx->skb->len;
2021
2022 if (!ieee80211_is_action(mgmt->frame_control))
2023 return RX_CONTINUE;
2024
026331c4
JM		 2025 /* drop too small frames */
2026 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2027 return RX_DROP_UNUSABLE;
de1ede7a 2028
026331c4 2029 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2030 return RX_DROP_UNUSABLE;
de1ede7a 2031
554891e6 2032 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2033 return RX_DROP_UNUSABLE;
97ebe12a 2034
de1ede7a
JB		 2035 switch (mgmt->u.action.category) {
2036 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2037 /*
2038 * The aggregation code is not prepared to handle
2039 * anything but STA/AP due to the BSSID handling;
2040 * IBSS could work in the code but isn't supported
2041 * by drivers or the standard.
2042 */
2043 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2044 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2045 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2046 break;
8abd3f9b 2047
026331c4
JM		 2048 /* verify action_code is present */
2049 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2050 break;
2051
de1ede7a
JB		 2052 switch (mgmt->u.action.u.addba_req.action_code) {
2053 case WLAN_ACTION_ADDBA_REQ:
2054 if (len < (IEEE80211_MIN_ACTION_SIZE +
2055 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2056 goto invalid;
2057 break;
de1ede7a
JB		 2058 case WLAN_ACTION_ADDBA_RESP:
2059 if (len < (IEEE80211_MIN_ACTION_SIZE +
2060 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2061 goto invalid;
2062 break;
de1ede7a
JB		 2063 case WLAN_ACTION_DELBA:
2064 if (len < (IEEE80211_MIN_ACTION_SIZE +
2065 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2066 goto invalid;
2067 break;
2068 default:
2069 goto invalid;
de1ede7a 2070 }
bed7ee6e 2071
8b58ff83 2072 goto queue;
39192c0b
JB		 2073 case WLAN_CATEGORY_SPECTRUM_MGMT:
2074 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2075 break;
46900298
JB		 2076
2077 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2078 break;
46900298 2079
026331c4
JM		 2080 /* verify action_code is present */
2081 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2082 break;
2083
39192c0b
JB		 2084 switch (mgmt->u.action.u.measurement.action_code) {
2085 case WLAN_ACTION_SPCT_MSR_REQ:
2086 if (len < (IEEE80211_MIN_ACTION_SIZE +
2087 sizeof(mgmt->u.action.u.measurement)))
84040805 2088 break;
39192c0b 2089 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2090 goto handled;
c481ec97
S		 2091 case WLAN_ACTION_SPCT_CHL_SWITCH:
2092 if (len < (IEEE80211_MIN_ACTION_SIZE +
2093 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2094 break;
c481ec97 2095
cc32abd4 2096 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2097 break;
cc32abd4 2098
46900298 2099 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2100 break;
c481ec97 2101
8b58ff83 2102 goto queue;
39192c0b
JB		 2103 }
2104 break;
fea14732
JM		 2105 case WLAN_CATEGORY_SA_QUERY:
2106 if (len < (IEEE80211_MIN_ACTION_SIZE +
2107 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2108 break;
2109
fea14732
JM		 2110 switch (mgmt->u.action.u.sa_query.action) {
2111 case WLAN_ACTION_SA_QUERY_REQUEST:
2112 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2113 break;
fea14732 2114 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2115 goto handled;
fea14732
JM		 2116 }
2117 break;
97ad9139
JC		 2118 case WLAN_CATEGORY_MESH_PLINK:
2119 case WLAN_CATEGORY_MESH_PATH_SEL:
77a121c3
JB		 2120 if (!ieee80211_vif_is_mesh(&sdata->vif))
2121 break;
8b58ff83 2122 goto queue;
84040805 2123 }
026331c4 2124
2e161f78
JB		 2125 return RX_CONTINUE;
2126
bed7ee6e 2127 invalid:
554891e6 2128 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2129 /* will return in the next handlers */
2130 return RX_CONTINUE;
2131
2132 handled:
2133 if (rx->sta)
2134 rx->sta->rx_packets++;
2135 dev_kfree_skb(rx->skb);
2136 return RX_QUEUED;
2137
2138 queue:
2139 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2140 skb_queue_tail(&sdata->skb_queue, rx->skb);
2141 ieee80211_queue_work(&local->hw, &sdata->work);
2142 if (rx->sta)
2143 rx->sta->rx_packets++;
2144 return RX_QUEUED;
2145}
2146
2147static ieee80211_rx_result debug_noinline
2148ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2149{
554891e6 2150 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2151
2152 /* skip known-bad action frames and return them in the next handler */
554891e6 2153 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2154 return RX_CONTINUE;
d7907448 2155
026331c4
JM		 2156 /*
2157 * Getting here means the kernel doesn't know how to handle
2158 * it, but maybe userspace does ... include returned frames
2159 * so userspace can register for those to know whether ones
2160 * it transmitted were processed or returned.
2161 */
026331c4 2162
2e161f78
JB		 2163 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2164 rx->skb->data, rx->skb->len,
2165 GFP_ATOMIC)) {
2166 if (rx->sta)
2167 rx->sta->rx_packets++;
2168 dev_kfree_skb(rx->skb);
2169 return RX_QUEUED;
2170 }
2171
2172
2173 return RX_CONTINUE;
2174}
2175
2176static ieee80211_rx_result debug_noinline
2177ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2178{
2179 struct ieee80211_local *local = rx->local;
2180 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2181 struct sk_buff *nskb;
2182 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2183 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2184
2185 if (!ieee80211_is_action(mgmt->frame_control))
2186 return RX_CONTINUE;
2187
2188 /*
2189 * For AP mode, hostapd is responsible for handling any action
2190 * frames that we didn't handle, including returning unknown
2191 * ones. For all other modes we will return them to the sender,
2192 * setting the 0x80 bit in the action category, as required by
2193 * 802.11-2007 7.3.1.11.
2194 * Newer versions of hostapd shall also use the management frame
2195 * registration mechanisms, but older ones still use cooked
2196 * monitor interfaces so push all frames there.
2197 */
554891e6 2198 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2199 (sdata->vif.type == NL80211_IFTYPE_AP ||
2200 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2201 return RX_DROP_MONITOR;
026331c4 2202
84040805
JB		 2203 /* do not return rejected action frames */
2204 if (mgmt->u.action.category & 0x80)
2205 return RX_DROP_UNUSABLE;
2206
2207 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2208 GFP_ATOMIC);
2209 if (nskb) {
292b4df6 2210 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2211
292b4df6
JL		 2212 nmgmt->u.action.category |= 0x80;
2213 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2214 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2215
2216 memset(nskb->cb, 0, sizeof(nskb->cb));
2217
2218 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2219 }
39192c0b
JB		 2220 dev_kfree_skb(rx->skb);
2221 return RX_QUEUED;
de1ede7a
JB		 2222}
2223
49461622 2224static ieee80211_rx_result debug_noinline
5cf121c3 2225ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2226{
eb9fb5b8 2227 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2228 ieee80211_rx_result rxs;
77a121c3
JB		 2229 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2230 __le16 stype;
571ecf67 2231
af6b6374
JB		 2232 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2233 if (rxs != RX_CONTINUE)
2234 return rxs;
2235
77a121c3 2236 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2237
77a121c3
JB		 2238 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2239 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2240 sdata->vif.type != NL80211_IFTYPE_STATION)
2241 return RX_DROP_MONITOR;
472dbc45 2242
77a121c3
JB		 2243 switch (stype) {
2244 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2245 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2246 /* process for all: mesh, mlme, ibss */
2247 break;
2248 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2249 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2250 /* process only for station */
2251 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2252 return RX_DROP_MONITOR;
2253 break;
2254 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2255 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2256 /* process only for ibss */
2257 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2258 return RX_DROP_MONITOR;
2259 break;
2260 default:
2261 return RX_DROP_MONITOR;
2262 }
f9d540ee 2263
77a121c3 2264 /* queue up frame and kick off work to process it */
c1475ca9 2265 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2266 skb_queue_tail(&sdata->skb_queue, rx->skb);
2267 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2268 if (rx->sta)
2269 rx->sta->rx_packets++;
46900298 2270
77a121c3 2271 return RX_QUEUED;
571ecf67
JB		 2272}
2273
3b8d81e0 2274static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2275 struct ieee80211_rx_data *rx)
571ecf67 2276{
a7767f95
HH		 2277 int keyidx;
2278 unsigned int hdrlen;
571ecf67 2279
a7767f95 2280 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2281 if (rx->skb->len >= hdrlen + 4)
2282 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2283 else
2284 keyidx = -1;
2285
8944b79f 2286 if (!rx->sta) {
aa0daf0e
JB		 2287 /*
2288 * Some hardware seem to generate incorrect Michael MIC
2289 * reports; ignore them to avoid triggering countermeasures.
2290 */
af2ced6a 2291 return;
571ecf67
JB		 2292 }
2293
a7767f95 2294 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2295 return;
571ecf67 2296
05c914fe 2297 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2298 /*
2299 * APs with pairwise keys should never receive Michael MIC
2300 * errors for non-zero keyidx because these are reserved for
2301 * group keys and only the AP is sending real multicast
2302 * frames in the BSS.
2303 */
af2ced6a 2304 return;
571ecf67
JB		 2305 }
2306
a7767f95
HH		 2307 if (!ieee80211_is_data(hdr->frame_control) &&
2308 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2309 return;
571ecf67 2310
e6d6e342
JB		 2311 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2312 GFP_ATOMIC);
571ecf67
JB		 2313}
2314
5cf121c3 2315/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2316static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2317 struct ieee80211_rate *rate)
3d30d949
MW		 2318{
2319 struct ieee80211_sub_if_data *sdata;
2320 struct ieee80211_local *local = rx->local;
2321 struct ieee80211_rtap_hdr {
2322 struct ieee80211_radiotap_header hdr;
2323 u8 flags;
5f0b7de5 2324 u8 rate_or_pad;
3d30d949
MW		 2325 __le16 chan_freq;
2326 __le16 chan_flags;
bc10502d 2327 } __packed *rthdr;
3d30d949
MW		 2328 struct sk_buff *skb = rx->skb, *skb2;
2329 struct net_device *prev_dev = NULL;
eb9fb5b8 2330 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2331
554891e6
JB		 2332 /*
2333 * If cooked monitor has been processed already, then
2334 * don't do it again. If not, set the flag.
2335 */
2336 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2337 goto out_free_skb;
554891e6 2338 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2339
3d30d949
MW		 2340 if (skb_headroom(skb) < sizeof(*rthdr) &&
2341 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2342 goto out_free_skb;
2343
2344 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2345 memset(rthdr, 0, sizeof(*rthdr));
2346 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2347 rthdr->hdr.it_present =
2348 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2349 (1 << IEEE80211_RADIOTAP_CHANNEL));
2350
5f0b7de5
JB		 2351 if (rate) {
2352 rthdr->rate_or_pad = rate->bitrate / 5;
2353 rthdr->hdr.it_present |=
2354 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2355 }
3d30d949
MW		 2356 rthdr->chan_freq = cpu_to_le16(status->freq);
2357
2358 if (status->band == IEEE80211_BAND_5GHZ)
2359 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2360 IEEE80211_CHAN_5GHZ);
2361 else
2362 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2363 IEEE80211_CHAN_2GHZ);
2364
2365 skb_set_mac_header(skb, 0);
2366 skb->ip_summed = CHECKSUM_UNNECESSARY;
2367 skb->pkt_type = PACKET_OTHERHOST;
2368 skb->protocol = htons(ETH_P_802_2);
2369
2370 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2371 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2372 continue;
2373
05c914fe 2374 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2375 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2376 continue;
2377
2378 if (prev_dev) {
2379 skb2 = skb_clone(skb, GFP_ATOMIC);
2380 if (skb2) {
2381 skb2->dev = prev_dev;
5548a8a1 2382 netif_receive_skb(skb2);
3d30d949
MW		 2383 }
2384 }
2385
2386 prev_dev = sdata->dev;
2387 sdata->dev->stats.rx_packets++;
2388 sdata->dev->stats.rx_bytes += skb->len;
2389 }
2390
2391 if (prev_dev) {
2392 skb->dev = prev_dev;
5548a8a1 2393 netif_receive_skb(skb);
554891e6
JB		 2394 return;
2395 }
3d30d949
MW		 2396
2397 out_free_skb:
2398 dev_kfree_skb(skb);
2399}
2400
aa0c8636
CL		 2401static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2402 ieee80211_rx_result res)
2403{
2404 switch (res) {
2405 case RX_DROP_MONITOR:
2406 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2407 if (rx->sta)
2408 rx->sta->rx_dropped++;
2409 /* fall through */
2410 case RX_CONTINUE: {
2411 struct ieee80211_rate *rate = NULL;
2412 struct ieee80211_supported_band *sband;
2413 struct ieee80211_rx_status *status;
2414
2415 status = IEEE80211_SKB_RXCB((rx->skb));
2416
2417 sband = rx->local->hw.wiphy->bands[status->band];
2418 if (!(status->flag & RX_FLAG_HT))
2419 rate = &sband->bitrates[status->rate_idx];
2420
2421 ieee80211_rx_cooked_monitor(rx, rate);
2422 break;
2423 }
2424 case RX_DROP_UNUSABLE:
2425 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2426 if (rx->sta)
2427 rx->sta->rx_dropped++;
2428 dev_kfree_skb(rx->skb);
2429 break;
2430 case RX_QUEUED:
2431 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2432 break;
2433 }
2434}
571ecf67 2435
aa0c8636
CL		 2436static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2437 struct sk_buff_head *frames)
58905290 2438{
58905290 2439 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2440 struct sk_buff *skb;
8944b79f 2441
e32f85f7
LCC		 2442#define CALL_RXH(rxh) \
2443 do { \
2444 res = rxh(rx); \
2445 if (res != RX_CONTINUE) \
2569a826 2446 goto rxh_next; \
e32f85f7 2447 } while (0);
49461622 2448
aa0c8636 2449 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2450 /*
2451 * all the other fields are valid across frames
2452 * that belong to an aMPDU since they are on the
2453 * same TID from the same station
2454 */
2455 rx->skb = skb;
554891e6 2456 rx->flags = 0;
2569a826
JB		 2457
2458 CALL_RXH(ieee80211_rx_h_decrypt)
2459 CALL_RXH(ieee80211_rx_h_check_more_data)
2460 CALL_RXH(ieee80211_rx_h_sta_process)
2461 CALL_RXH(ieee80211_rx_h_defragment)
2462 CALL_RXH(ieee80211_rx_h_ps_poll)
2463 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2464 /* must be after MMIC verify so header is counted in MPDU mic */
2465 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2466 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2467#ifdef CONFIG_MAC80211_MESH
aa0c8636 2468 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2469 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2470#endif
2569a826
JB		 2471 CALL_RXH(ieee80211_rx_h_data)
2472
2473 /* special treatment -- needs the queue */
aa0c8636 2474 res = ieee80211_rx_h_ctrl(rx, frames);
2569a826
JB		 2475 if (res != RX_CONTINUE)
2476 goto rxh_next;
2477
2e161f78 2478 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2479 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2480 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2481 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2482 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2483
aa0c8636
CL		 2484 rxh_next:
2485 ieee80211_rx_handlers_result(rx, res);
2486
49461622 2487#undef CALL_RXH
aa0c8636
CL		 2488 }
2489}
2490
4406c376 2491static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636
CL		 2492{
2493 struct sk_buff_head reorder_release;
2494 ieee80211_rx_result res = RX_DROP_MONITOR;
2495
2496 __skb_queue_head_init(&reorder_release);
2497
aa0c8636
CL		 2498#define CALL_RXH(rxh) \
2499 do { \
2500 res = rxh(rx); \
2501 if (res != RX_CONTINUE) \
2502 goto rxh_next; \
2503 } while (0);
2504
2505 CALL_RXH(ieee80211_rx_h_passive_scan)
2506 CALL_RXH(ieee80211_rx_h_check)
2507
2508 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2509
2510 ieee80211_rx_handlers(rx, &reorder_release);
2511 return;
49461622 2512
2569a826 2513 rxh_next:
aa0c8636
CL		 2514 ieee80211_rx_handlers_result(rx, res);
2515
2516#undef CALL_RXH
58905290
JB		 2517}
2518
2bff8ebf
CL		 2519/*
2520 * This function makes calls into the RX path. Therefore the
2521 * caller must hold the sta_info->lock and everything has to
2522 * be under rcu_read_lock protection as well.
2523 */
2524void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2525{
2526 struct sk_buff_head frames;
554891e6
JB		 2527 struct ieee80211_rx_data rx = {
2528 .sta = sta,
2529 .sdata = sta->sdata,
2530 .local = sta->local,
2531 .queue = tid,
2532 };
2c15a0cf
CL		 2533 struct tid_ampdu_rx *tid_agg_rx;
2534
2535 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2536 if (!tid_agg_rx)
2537 return;
2bff8ebf
CL		 2538
2539 __skb_queue_head_init(&frames);
2540
2c15a0cf
CL		 2541 spin_lock(&tid_agg_rx->reorder_lock);
2542 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2543 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf
CL		 2544
2545 ieee80211_rx_handlers(&rx, &frames);
2546}
2547
571ecf67
JB		 2548/* main receive path */
2549
20b01f80 2550static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2551 struct ieee80211_hdr *hdr)
2552{
20b01f80 2553 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2554 struct sk_buff *skb = rx->skb;
2555 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2556 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2557 int multicast = is_multicast_ether_addr(hdr->addr1);
2558
51fb61e7 2559 switch (sdata->vif.type) {
05c914fe 2560 case NL80211_IFTYPE_STATION:
9bc383de 2561 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2562 return 0;
77fdaa12 2563 if (!multicast &&
47846c9b 2564 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2565 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2566 return 0;
554891e6 2567 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2568 }
2569 break;
05c914fe 2570 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2571 if (!bssid)
2572 return 0;
a7767f95 2573 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2574 return 1;
87291c02 2575 }
46900298 2576 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2577 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2578 return 0;
554891e6 2579 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2580 } else if (!multicast &&
47846c9b 2581 compare_ether_addr(sdata->vif.addr,
23a24def 2582 hdr->addr1) != 0) {
4150c572 2583 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2584 return 0;
554891e6 2585 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2586 } else if (!rx->sta) {
2587 int rate_idx;
eb9fb5b8 2588 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2589 rate_idx = 0; /* TODO: HT rates */
2590 else
eb9fb5b8 2591 rate_idx = status->rate_idx;
34e89507
JB		 2592 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2593 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2594 }
23a24def 2595 break;
05c914fe 2596 case NL80211_IFTYPE_MESH_POINT:
6032f934 2597 if (!multicast &&
47846c9b 2598 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2599 hdr->addr1) != 0) {
2600 if (!(sdata->dev->flags & IFF_PROMISC))
2601 return 0;
2602
554891e6 2603 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2604 }
2605 break;
05c914fe
JB		 2606 case NL80211_IFTYPE_AP_VLAN:
2607 case NL80211_IFTYPE_AP:
23a24def 2608 if (!bssid) {
47846c9b 2609 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2610 hdr->addr1))
2611 return 0;
2612 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2613 sdata->vif.addr)) {
554891e6 2614 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2615 return 0;
554891e6 2616 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2617 }
23a24def 2618 break;
05c914fe 2619 case NL80211_IFTYPE_WDS:
a7767f95 2620 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2621 return 0;
2622 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2623 return 0;
2624 break;
2ca27bcf 2625 default:
fb1c1cd6
JB		 2626 /* should never get here */
2627 WARN_ON(1);
2628 break;
23a24def
JB		 2629 }
2630
2631 return 1;
2632}
2633
4406c376
JB		 2634/*
2635 * This function returns whether or not the SKB
2636 * was destined for RX processing or not, which,
2637 * if consume is true, is equivalent to whether
2638 * or not the skb was consumed.
2639 */
2640static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2641 struct sk_buff *skb, bool consume)
2642{
2643 struct ieee80211_local *local = rx->local;
2644 struct ieee80211_sub_if_data *sdata = rx->sdata;
2645 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2646 struct ieee80211_hdr *hdr = (void *)skb->data;
2647 int prepares;
2648
2649 rx->skb = skb;
554891e6 2650 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2651 prepares = prepare_for_handlers(rx, hdr);
2652
2653 if (!prepares)
2654 return false;
2655
2656 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2657 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2658 ieee80211_rx_michael_mic_report(hdr, rx);
2659 return false;
2660 }
2661
2662 if (!consume) {
2663 skb = skb_copy(skb, GFP_ATOMIC);
2664 if (!skb) {
2665 if (net_ratelimit())
2666 wiphy_debug(local->hw.wiphy,
2667 "failed to copy multicast frame for %s\n",
2668 sdata->name);
2669 return true;
2670 }
2671
2672 rx->skb = skb;
2673 }
2674
2675 ieee80211_invoke_rx_handlers(rx);
2676 return true;
2677}
2678
571ecf67 2679/*
6368e4b1
RR		 2680 * This is the actual Rx frames handler. as it blongs to Rx path it must
2681 * be called with rcu_read_lock protection.
571ecf67 2682 */
71ebb4aa 2683static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2684 struct sk_buff *skb)
571ecf67 2685{
554891e6 2686 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2687 struct ieee80211_local *local = hw_to_local(hw);
2688 struct ieee80211_sub_if_data *sdata;
571ecf67 2689 struct ieee80211_hdr *hdr;
e3cf8b3f 2690 __le16 fc;
5cf121c3 2691 struct ieee80211_rx_data rx;
4406c376 2692 struct ieee80211_sub_if_data *prev;
56af3268 2693 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2694 int err = 0;
571ecf67 2695
e3cf8b3f 2696 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2697 memset(&rx, 0, sizeof(rx));
2698 rx.skb = skb;
2699 rx.local = local;
72abd81b 2700
e3cf8b3f 2701 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2702 local->dot11ReceivedFragmentCount++;
571ecf67 2703
142b9f50
HS		 2704 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2705 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
554891e6 2706 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2707
e3cf8b3f
ZY		 2708 if (ieee80211_is_mgmt(fc))
2709 err = skb_linearize(skb);
2710 else
2711 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2712
2713 if (err) {
2714 dev_kfree_skb(skb);
2715 return;
2716 }
2717
2718 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2719 ieee80211_parse_qos(&rx);
d1c3a37c 2720 ieee80211_verify_alignment(&rx);
38f3714d 2721
e3cf8b3f 2722 if (ieee80211_is_data(fc)) {
56af3268 2723 prev_sta = NULL;
4406c376 2724
abe60632 2725 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2726 if (!prev_sta) {
2727 prev_sta = sta;
2728 continue;
2729 }
2730
2731 rx.sta = prev_sta;
2732 rx.sdata = prev_sta->sdata;
4406c376 2733 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2734
56af3268 2735 prev_sta = sta;
4406c376 2736 }
56af3268
BG		 2737
2738 if (prev_sta) {
2739 rx.sta = prev_sta;
2740 rx.sdata = prev_sta->sdata;
2741
4406c376 2742 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2743 return;
56af3268 2744 }
4406c376
JB		 2745 }
2746
4b0dd98e 2747 prev = NULL;
b2e7771e 2748
4b0dd98e
JB		 2749 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2750 if (!ieee80211_sdata_running(sdata))
2751 continue;
340e11f3 2752
4b0dd98e
JB		 2753 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2754 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2755 continue;
340e11f3 2756
4b0dd98e
JB		 2757 /*
2758 * frame is destined for this interface, but if it's
2759 * not also for the previous one we handle that after
2760 * the loop to avoid copying the SKB once too much
2761 */
4bb29f8c 2762
4b0dd98e 2763 if (!prev) {
abe60632 2764 prev = sdata;
4b0dd98e 2765 continue;
340e11f3 2766 }
4bb29f8c 2767
4b0dd98e
JB		 2768 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2769 rx.sdata = prev;
2770 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2771
4b0dd98e
JB		 2772 prev = sdata;
2773 }
2774
2775 if (prev) {
2776 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2777 rx.sdata = prev;
4406c376 2778
4b0dd98e
JB		 2779 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2780 return;
571ecf67 2781 }
4406c376
JB		 2782
2783 dev_kfree_skb(skb);
571ecf67 2784}
6368e4b1
RR		 2785
2786/*
2787 * This is the receive path handler. It is called by a low level driver when an
2788 * 802.11 MPDU is received from the hardware.
2789 */
103bf9f7 2790void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2791{
2792 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2793 struct ieee80211_rate *rate = NULL;
2794 struct ieee80211_supported_band *sband;
f1d58c25 2795 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2796
d20ef63d
JB		 2797 WARN_ON_ONCE(softirq_count() == 0);
2798
77a980dc
JB		 2799 if (WARN_ON(status->band < 0 ||
2800 status->band >= IEEE80211_NUM_BANDS))
2801 goto drop;
8318d78a
JB		 2802
2803 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2804 if (WARN_ON(!sband))
2805 goto drop;
8318d78a 2806
89c3a8ac
JB		 2807 /*
2808 * If we're suspending, it is possible although not too likely
2809 * that we'd be receiving frames after having already partially
2810 * quiesced the stack. We can't process such frames then since
2811 * that might, for example, cause stations to be added or other
2812 * driver callbacks be invoked.
2813 */
77a980dc
JB		 2814 if (unlikely(local->quiescing || local->suspended))
2815 goto drop;
89c3a8ac 2816
ea77f12f
JB		 2817 /*
2818 * The same happens when we're not even started,
2819 * but that's worth a warning.
2820 */
77a980dc
JB		 2821 if (WARN_ON(!local->started))
2822 goto drop;
ea77f12f 2823
fc885189 2824 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2825 /*
fc885189
JB		 2826 * Validate the rate, unless a PLCP error means that
2827 * we probably can't have a valid rate here anyway.
e5d6eb83 2828 */
fc885189
JB		 2829
2830 if (status->flag & RX_FLAG_HT) {
2831 /*
2832 * rate_idx is MCS index, which can be [0-76]
2833 * as documented on:
2834 *
2835 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2836 *
2837 * Anything else would be some sort of driver or
2838 * hardware error. The driver should catch hardware
2839 * errors.
2840 */
2841 if (WARN((status->rate_idx < 0 ||
2842 status->rate_idx > 76),
2843 "Rate marked as an HT rate but passed "
2844 "status->rate_idx is not "
2845 "an MCS index [0-76]: %d (0x%02x)\n",
2846 status->rate_idx,
2847 status->rate_idx))
2848 goto drop;
2849 } else {
2850 if (WARN_ON(status->rate_idx < 0 ||
2851 status->rate_idx >= sband->n_bitrates))
2852 goto drop;
2853 rate = &sband->bitrates[status->rate_idx];
2854 }
0fb8ca45 2855 }
6368e4b1 2856
554891e6
JB		 2857 status->rx_flags = 0;
2858
6368e4b1
RR		 2859 /*
2860 * key references and virtual interfaces are protected using RCU
2861 * and this requires that we are in a read-side RCU section during
2862 * receive processing
2863 */
2864 rcu_read_lock();
2865
2866 /*
2867 * Frames with failed FCS/PLCP checksum are not returned,
2868 * all other frames are returned without radiotap header
2869 * if it was previously present.
2870 * Also, frames with less than 16 bytes are dropped.
2871 */
f1d58c25 2872 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2873 if (!skb) {
2874 rcu_read_unlock();
2875 return;
2876 }
2877
071d9ac2 2878 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2879
2880 rcu_read_unlock();
77a980dc
JB		 2881
2882 return;
2883 drop:
2884 kfree_skb(skb);
6368e4b1 2885}
103bf9f7 2886EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2887
2888/* This is a version of the rx handler that can be called from hard irq
2889 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2890void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2891{
2892 struct ieee80211_local *local = hw_to_local(hw);
2893
2894 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2895
571ecf67
JB		 2896 skb->pkt_type = IEEE80211_RX_MSG;
2897 skb_queue_tail(&local->skb_queue, skb);
2898 tasklet_schedule(&local->tasklet);
2899}
2900EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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