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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[net-next-2.6.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
601ae7f2
BR		 88 return len;
89}
90
d1c3a37c 91/*
601ae7f2
BR		 92 * ieee80211_add_rx_radiotap_header - add radiotap header
93 *
94 * add a radiotap header containing all the fields which the hardware provided.
95 */
96static void
97ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98 struct sk_buff *skb,
601ae7f2
BR		 99 struct ieee80211_rate *rate,
100 int rtap_len)
101{
f1d58c25 102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 103 struct ieee80211_radiotap_header *rthdr;
104 unsigned char *pos;
6a86b9c7 105 u16 rx_flags = 0;
601ae7f2
BR		 106
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
109
110 /* radiotap header, set always present flags */
111 rthdr->it_present =
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
117
118 pos = (unsigned char *)(rthdr+1);
119
120 /* the order of the following fields is important */
121
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 124 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 125 rthdr->it_present |=
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127 pos += 8;
128 }
129
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 137 pos++;
138
139 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 140 if (status->flag & RX_FLAG_HT) {
141 /*
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147 */
148 *pos = 0;
8d6f658e 149 } else {
ebe6c7ba 150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 151 *pos = rate->bitrate / 5;
8d6f658e 152 }
601ae7f2
BR		 153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 156 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
5f0b7de5
JB		 161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
9deb1ae5 164 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
601ae7f2 167 else
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2
BR		 170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
601ae7f2
BR		 180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
601ae7f2
BR		 186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 190 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 191 pos++;
aae89831 192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
601ae7f2
BR		 195 pos += 2;
196}
197
b2e7771e
JB		 198/*
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
202 */
203static struct sk_buff *
204ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 205 struct ieee80211_rate *rate)
b2e7771e 206{
f1d58c25 207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 208 struct ieee80211_sub_if_data *sdata;
b2e7771e 209 int needed_headroom = 0;
b2e7771e
JB		 210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
b2e7771e
JB		 213
214 /*
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
218 *
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
221 */
0869aea0
JB		 222
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 225
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
228
e3cf8b3f
ZY		 229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
232 return NULL;
233 }
234
b2e7771e 235 if (!local->monitors) {
0869aea0 236 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 237 dev_kfree_skb(origskb);
238 return NULL;
239 }
240
0869aea0 241 return remove_monitor_info(local, origskb);
b2e7771e
JB		 242 }
243
0869aea0 244 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 245 /* only need to expand headroom if necessary */
246 skb = origskb;
247 origskb = NULL;
248
249 /*
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
255 */
256 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 258 dev_kfree_skb(skb);
259 return NULL;
260 }
261 } else {
262 /*
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
265 */
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
0869aea0 268 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 269
270 if (!skb)
271 return origskb;
272 }
273
0869aea0
JB		 274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 276
ce3edf6d 277 skb_reset_mac_header(skb);
b2e7771e
JB		 278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 284 continue;
285
3d30d949
MW		 286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287 continue;
288
9607e6b6 289 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 290 continue;
291
b2e7771e
JB		 292 if (prev_dev) {
293 skb2 = skb_clone(skb, GFP_ATOMIC);
294 if (skb2) {
295 skb2->dev = prev_dev;
5548a8a1 296 netif_receive_skb(skb2);
b2e7771e
JB		 297 }
298 }
299
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
303 }
304
305 if (prev_dev) {
306 skb->dev = prev_dev;
5548a8a1 307 netif_receive_skb(skb);
b2e7771e
JB		 308 } else
309 dev_kfree_skb(skb);
310
311 return origskb;
312}
313
314
5cf121c3 315static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 316{
238f74a2 317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 318 int tid;
319
320 /* does the frame have a qos control field? */
238f74a2
HH		 321 if (ieee80211_is_data_qos(hdr->frame_control)) {
322 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 323 /* frame has qos control */
238f74a2
HH		 324 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
325 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 326 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 327 else
5cf121c3 328 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 329 } else {
1411f9b5
JB		 330 /*
331 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
332 *
333 * Sequence numbers for management frames, QoS data
334 * frames with a broadcast/multicast address in the
335 * Address 1 field, and all non-QoS data frames sent
336 * by QoS STAs are assigned using an additional single
337 * modulo-4096 counter, [...]
338 *
339 * We also use that counter for non-QoS STAs.
340 */
341 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 342 }
52865dfd 343
5cf121c3 344 rx->queue = tid;
6e0d114d
JB		 345 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
346 * For now, set skb->priority to 0 for other cases. */
347 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 348}
6e0d114d 349
d1c3a37c
JB		 350/**
351 * DOC: Packet alignment
352 *
353 * Drivers always need to pass packets that are aligned to two-byte boundaries
354 * to the stack.
355 *
356 * Additionally, should, if possible, align the payload data in a way that
357 * guarantees that the contained IP header is aligned to a four-byte
358 * boundary. In the case of regular frames, this simply means aligning the
359 * payload to a four-byte boundary (because either the IP header is directly
360 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 361 * in front of it). If the payload data is not properly aligned and the
362 * architecture doesn't support efficient unaligned operations, mac80211
363 * will align the data.
d1c3a37c
JB		 364 *
365 * With A-MSDU frames, however, the payload data address must yield two modulo
366 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
367 * push the IP header further back to a multiple of four again. Thankfully, the
368 * specs were sane enough this time around to require padding each A-MSDU
369 * subframe to a length that is a multiple of four.
370 *
371 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
372 * the payload is not supported, the driver is required to move the 802.11
373 * header to be directly in front of the payload in that case.
374 */
375static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 376{
59d9cb07
KV		 377#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
378 WARN_ONCE((unsigned long)rx->skb->data & 1,
379 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 380#endif
6e0d114d
JB		 381}
382
6368e4b1 383
571ecf67
JB		 384/* rx handlers */
385
49461622 386static ieee80211_rx_result debug_noinline
5cf121c3 387ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 388{
389 struct ieee80211_local *local = rx->local;
390 struct sk_buff *skb = rx->skb;
391
fbe9c429 392 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning)))
f1d58c25 393 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 394
142b9f50
HS		 395 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) &&
396 (rx->flags & IEEE80211_RX_IN_SCAN))) {
ece8eddd 397 /* drop all the other packets during a software scan anyway */
f1d58c25 398 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 399 dev_kfree_skb(skb);
9ae54c84 400 return RX_QUEUED;
571ecf67
JB		 401 }
402
5cf121c3 403 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
571ecf67
JB		 404 /* scanning finished during invoking of handlers */
405 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
e4c26add 406 return RX_DROP_UNUSABLE;
571ecf67
JB		 407 }
408
9ae54c84 409 return RX_CONTINUE;
571ecf67
JB		 410}
411
3cfcf6ac
JM		 412
413static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
414{
415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
416
417 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
418 return 0;
419
420 return ieee80211_is_robust_mgmt_frame(hdr);
421}
422
423
424static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
425{
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
427
428 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
429 return 0;
430
431 return ieee80211_is_robust_mgmt_frame(hdr);
432}
433
434
435/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
436static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
437{
438 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
439 struct ieee80211_mmie *mmie;
440
441 if (skb->len < 24 + sizeof(*mmie) ||
442 !is_multicast_ether_addr(hdr->da))
443 return -1;
444
445 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
446 return -1; /* not a robust management frame */
447
448 mmie = (struct ieee80211_mmie *)
449 (skb->data + skb->len - sizeof(*mmie));
450 if (mmie->element_id != WLAN_EID_MMIE ||
451 mmie->length != sizeof(*mmie) - 2)
452 return -1;
453
454 return le16_to_cpu(mmie->key_id);
455}
456
457
33b64eb2 458static ieee80211_rx_result
5cf121c3 459ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 460{
a7767f95
HH		 461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
462 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 463 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 464
a7767f95 465 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 466 if (is_multicast_ether_addr(hdr->addr1)) {
467 if (ieee80211_has_tods(hdr->frame_control) ||
468 !ieee80211_has_fromds(hdr->frame_control))
469 return RX_DROP_MONITOR;
470 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
471 return RX_DROP_MONITOR;
472 } else {
473 if (!ieee80211_has_a4(hdr->frame_control))
474 return RX_DROP_MONITOR;
475 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
476 return RX_DROP_MONITOR;
477 }
33b64eb2
LCC		 478 }
479
480 /* If there is not an established peer link and this is not a peer link
481 * establisment frame, beacon or probe, drop the frame.
482 */
483
b4e08ea1 484 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 485 struct ieee80211_mgmt *mgmt;
d6d1a5a7 486
a7767f95 487 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 488 return RX_DROP_MONITOR;
489
a7767f95 490 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 491 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 492 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 493 return RX_DROP_MONITOR;
33b64eb2 494 return RX_CONTINUE;
33b64eb2
LCC		 495 }
496
a7767f95
HH		 497 if (ieee80211_is_probe_req(hdr->frame_control) ||
498 ieee80211_is_probe_resp(hdr->frame_control) ||
499 ieee80211_is_beacon(hdr->frame_control))
500 return RX_CONTINUE;
501
502 return RX_DROP_MONITOR;
503
504 }
505
506#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
507
508 if (ieee80211_is_data(hdr->frame_control) &&
509 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 510 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 511 return RX_DROP_MONITOR;
902acc78 512#undef msh_h_get
d6d1a5a7 513
902acc78
JB		 514 return RX_CONTINUE;
515}
33b64eb2 516
1edfb1af
JB		 517#define SEQ_MODULO 0x1000
518#define SEQ_MASK 0xfff
519
520static inline int seq_less(u16 sq1, u16 sq2)
521{
522 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
523}
524
525static inline u16 seq_inc(u16 sq)
526{
527 return (sq + 1) & SEQ_MASK;
528}
529
530static inline u16 seq_sub(u16 sq1, u16 sq2)
531{
532 return (sq1 - sq2) & SEQ_MASK;
533}
534
535
536static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
537 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 538 int index,
539 struct sk_buff_head *frames)
1edfb1af 540{
1edfb1af 541 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
1edfb1af
JB		 542
543 if (!skb)
544 goto no_frame;
545
071d9ac2 546 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 547 tid_agg_rx->stored_mpdu_num--;
548 tid_agg_rx->reorder_buf[index] = NULL;
d29cecda 549 __skb_queue_tail(frames, skb);
1edfb1af
JB		 550
551no_frame:
552 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
553}
554
555static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
556 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 557 u16 head_seq_num,
558 struct sk_buff_head *frames)
1edfb1af
JB		 559{
560 int index;
561
562 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
563 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
564 tid_agg_rx->buf_size;
2569a826 565 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
1edfb1af
JB		 566 }
567}
568
569/*
570 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
571 * the skb was added to the buffer longer than this time ago, the earlier
572 * frames that have not yet been received are assumed to be lost and the skb
573 * can be released for processing. This may also release other skb's from the
574 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 575 *
576 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 577 */
578#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
579
aa0c8636
CL		 580static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
581 struct tid_ampdu_rx *tid_agg_rx,
582 struct sk_buff_head *frames)
583{
2bff8ebf 584 int index, j;
aa0c8636
CL		 585
586 /* release the buffer until next missing frame */
587 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
588 tid_agg_rx->buf_size;
589 if (!tid_agg_rx->reorder_buf[index] &&
590 tid_agg_rx->stored_mpdu_num > 1) {
591 /*
592 * No buffers ready to be released, but check whether any
593 * frames in the reorder buffer have timed out.
594 */
aa0c8636
CL		 595 int skipped = 1;
596 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
597 j = (j + 1) % tid_agg_rx->buf_size) {
598 if (!tid_agg_rx->reorder_buf[j]) {
599 skipped++;
600 continue;
601 }
602 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
603 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 604 goto set_release_timer;
aa0c8636
CL		 605
606#ifdef CONFIG_MAC80211_HT_DEBUG
607 if (net_ratelimit())
0fb9a9ec
JP		 608 wiphy_debug(hw->wiphy,
609 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636
CL		 610#endif
611 ieee80211_release_reorder_frame(hw, tid_agg_rx,
612 j, frames);
613
614 /*
615 * Increment the head seq# also for the skipped slots.
616 */
617 tid_agg_rx->head_seq_num =
618 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
619 skipped = 0;
620 }
621 } else while (tid_agg_rx->reorder_buf[index]) {
622 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
623 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
624 tid_agg_rx->buf_size;
625 }
2bff8ebf
CL		 626
627 if (tid_agg_rx->stored_mpdu_num) {
628 j = index = seq_sub(tid_agg_rx->head_seq_num,
629 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
630
631 for (; j != (index - 1) % tid_agg_rx->buf_size;
632 j = (j + 1) % tid_agg_rx->buf_size) {
633 if (tid_agg_rx->reorder_buf[j])
634 break;
635 }
636
637 set_release_timer:
638
639 mod_timer(&tid_agg_rx->reorder_timer,
640 tid_agg_rx->reorder_time[j] +
641 HT_RX_REORDER_BUF_TIMEOUT);
642 } else {
643 del_timer(&tid_agg_rx->reorder_timer);
644 }
aa0c8636
CL		 645}
646
1edfb1af
JB		 647/*
648 * As this function belongs to the RX path it must be under
649 * rcu_read_lock protection. It returns false if the frame
650 * can be processed immediately, true if it was consumed.
651 */
652static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
653 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 654 struct sk_buff *skb,
655 struct sk_buff_head *frames)
1edfb1af
JB		 656{
657 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
658 u16 sc = le16_to_cpu(hdr->seq_ctrl);
659 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
660 u16 head_seq_num, buf_size;
661 int index;
2bff8ebf 662 bool ret = true;
1edfb1af
JB		 663
664 buf_size = tid_agg_rx->buf_size;
665 head_seq_num = tid_agg_rx->head_seq_num;
666
2bff8ebf 667 spin_lock(&tid_agg_rx->reorder_lock);
1edfb1af
JB		 668 /* frame with out of date sequence number */
669 if (seq_less(mpdu_seq_num, head_seq_num)) {
670 dev_kfree_skb(skb);
2bff8ebf 671 goto out;
1edfb1af
JB		 672 }
673
674 /*
675 * If frame the sequence number exceeds our buffering window
676 * size release some previous frames to make room for this one.
677 */
678 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
679 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
680 /* release stored frames up to new head to stack */
2569a826
JB		 681 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
682 frames);
1edfb1af
JB		 683 }
684
685 /* Now the new frame is always in the range of the reordering buffer */
686
687 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
688
689 /* check if we already stored this frame */
690 if (tid_agg_rx->reorder_buf[index]) {
691 dev_kfree_skb(skb);
2bff8ebf 692 goto out;
1edfb1af
JB		 693 }
694
695 /*
696 * If the current MPDU is in the right order and nothing else
697 * is stored we can process it directly, no need to buffer it.
698 */
699 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
700 tid_agg_rx->stored_mpdu_num == 0) {
701 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 702 ret = false;
703 goto out;
1edfb1af
JB		 704 }
705
706 /* put the frame in the reordering buffer */
707 tid_agg_rx->reorder_buf[index] = skb;
708 tid_agg_rx->reorder_time[index] = jiffies;
709 tid_agg_rx->stored_mpdu_num++;
aa0c8636 710 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
1edfb1af 711
2bff8ebf
CL		 712 out:
713 spin_unlock(&tid_agg_rx->reorder_lock);
714 return ret;
1edfb1af
JB		 715}
716
717/*
718 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
719 * true if the MPDU was buffered, false if it should be processed.
720 */
2569a826
JB		 721static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
722 struct sk_buff_head *frames)
1edfb1af 723{
2569a826
JB		 724 struct sk_buff *skb = rx->skb;
725 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 726 struct ieee80211_hw *hw = &local->hw;
727 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 728 struct sta_info *sta = rx->sta;
1edfb1af
JB		 729 struct tid_ampdu_rx *tid_agg_rx;
730 u16 sc;
731 int tid;
732
733 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 734 goto dont_reorder;
1edfb1af
JB		 735
736 /*
737 * filter the QoS data rx stream according to
738 * STA/TID and check if this STA/TID is on aggregation
739 */
740
1edfb1af 741 if (!sta)
2569a826 742 goto dont_reorder;
1edfb1af
JB		 743
744 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
745
a87f736d
JB		 746 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
747 if (!tid_agg_rx)
748 goto dont_reorder;
1edfb1af
JB		 749
750 /* qos null data frames are excluded */
751 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 752 goto dont_reorder;
1edfb1af
JB		 753
754 /* new, potentially un-ordered, ampdu frame - process it */
755
756 /* reset session timer */
757 if (tid_agg_rx->timeout)
758 mod_timer(&tid_agg_rx->session_timer,
759 TU_TO_EXP_TIME(tid_agg_rx->timeout));
760
761 /* if this mpdu is fragmented - terminate rx aggregation session */
762 sc = le16_to_cpu(hdr->seq_ctrl);
763 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 764 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 765 skb_queue_tail(&rx->sdata->skb_queue, skb);
766 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 767 return;
1edfb1af
JB		 768 }
769
a87f736d
JB		 770 /*
771 * No locking needed -- we will only ever process one
772 * RX packet at a time, and thus own tid_agg_rx. All
773 * other code manipulating it needs to (and does) make
774 * sure that we cannot get to it any more before doing
775 * anything with it.
776 */
777 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
2569a826
JB		 778 return;
779
780 dont_reorder:
781 __skb_queue_tail(frames, skb);
1edfb1af 782}
33b64eb2 783
49461622 784static ieee80211_rx_result debug_noinline
5cf121c3 785ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 786{
a7767f95 787 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 788
789 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
790 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 791 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 792 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 793 hdr->seq_ctrl)) {
5cf121c3 794 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 795 rx->local->dot11FrameDuplicateCount++;
796 rx->sta->num_duplicates++;
797 }
e4c26add 798 return RX_DROP_MONITOR;
571ecf67 799 } else
5cf121c3 800 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 801 }
802
571ecf67
JB		 803 if (unlikely(rx->skb->len < 16)) {
804 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 805 return RX_DROP_MONITOR;
571ecf67
JB		 806 }
807
571ecf67
JB		 808 /* Drop disallowed frame classes based on STA auth/assoc state;
809 * IEEE 802.11, Chap 5.5.
810 *
ccd7b362
JB		 811 * mac80211 filters only based on association state, i.e. it drops
812 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 813 * deauth/disassoc frames when needed. In addition, hostapd is
814 * responsible for filtering on both auth and assoc states.
815 */
33b64eb2 816
902acc78 817 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 818 return ieee80211_rx_mesh_check(rx);
33b64eb2 819
a7767f95
HH		 820 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
821 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 822 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 823 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 824 if ((!ieee80211_has_fromds(hdr->frame_control) &&
825 !ieee80211_has_tods(hdr->frame_control) &&
826 ieee80211_is_data(hdr->frame_control)) ||
827 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 828 /* Drop IBSS frames and frames for other hosts
829 * silently. */
e4c26add 830 return RX_DROP_MONITOR;
571ecf67
JB		 831 }
832
e4c26add 833 return RX_DROP_MONITOR;
571ecf67
JB		 834 }
835
9ae54c84 836 return RX_CONTINUE;
570bd537
JB		 837}
838
839
49461622 840static ieee80211_rx_result debug_noinline
5cf121c3 841ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 842{
eb9fb5b8
JB		 843 struct sk_buff *skb = rx->skb;
844 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
845 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 846 int keyidx;
847 int hdrlen;
e4c26add 848 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 849 struct ieee80211_key *stakey = NULL;
3cfcf6ac 850 int mmie_keyidx = -1;
761ab470 851 __le16 fc;
570bd537 852
3017b80b
JB		 853 /*
854 * Key selection 101
855 *
3cfcf6ac 856 * There are four types of keys:
3017b80b 857 * - GTK (group keys)
3cfcf6ac 858 * - IGTK (group keys for management frames)
3017b80b
JB		 859 * - PTK (pairwise keys)
860 * - STK (station-to-station pairwise keys)
861 *
862 * When selecting a key, we have to distinguish between multicast
863 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 864 * use PTKs and STKs while the former always use GTKs and IGTKs.
865 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
866 * unicast frames can also use key indices like GTKs. Hence, if we
867 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 868 *
8dc06a1c
JB		 869 * Note that in a regular BSS, multicast frames are sent by the
870 * AP only, associated stations unicast the frame to the AP first
871 * which then multicasts it on their behalf.
872 *
3017b80b
JB		 873 * There is also a slight problem in IBSS mode: GTKs are negotiated
874 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 875 * The spec seems to expect that one negotiates the same key with
876 * every station but there's no such requirement; VLANs could be
877 * possible.
3017b80b
JB		 878 */
879
3017b80b 880 /*
1990af8d 881 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 882 * addressed to us nor a multicast frame.
883 */
5cf121c3 884 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 885 return RX_CONTINUE;
3017b80b 886
2569a826
JB		 887 /* start without a key */
888 rx->key = NULL;
889
d4e46a3d
JB		 890 if (rx->sta)
891 stakey = rcu_dereference(rx->sta->key);
892
761ab470
JB		 893 fc = hdr->frame_control;
894
895 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 896 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
897
d4e46a3d
JB		 898 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
899 rx->key = stakey;
dc1580dd
JB		 900 if ((status->flag & RX_FLAG_DECRYPTED) &&
901 (status->flag & RX_FLAG_IV_STRIPPED))
902 return RX_CONTINUE;
0c7c10c7 903 /* Skip decryption if the frame is not protected. */
761ab470 904 if (!ieee80211_has_protected(fc))
0c7c10c7 905 return RX_CONTINUE;
3cfcf6ac
JM		 906 } else if (mmie_keyidx >= 0) {
907 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 908 if ((status->flag & RX_FLAG_DECRYPTED) &&
909 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 910 return RX_CONTINUE;
911
912 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
913 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
914 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
915 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 916 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 917 /*
918 * The frame was not protected, so skip decryption. However, we
919 * need to set rx->key if there is a key that could have been
920 * used so that the frame may be dropped if encryption would
921 * have been expected.
922 */
923 struct ieee80211_key *key = NULL;
761ab470 924 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 925 is_multicast_ether_addr(hdr->addr1) &&
926 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
927 rx->key = key;
928 else if ((key = rcu_dereference(rx->sdata->default_key)))
929 rx->key = key;
930 return RX_CONTINUE;
571ecf67 931 } else {
39184b15 932 u8 keyid;
3017b80b
JB		 933 /*
934 * The device doesn't give us the IV so we won't be
935 * able to look up the key. That's ok though, we
936 * don't need to decrypt the frame, we just won't
937 * be able to keep statistics accurate.
938 * Except for key threshold notifications, should
939 * we somehow allow the driver to tell us which key
940 * the hardware used if this flag is set?
941 */
eb9fb5b8
JB		 942 if ((status->flag & RX_FLAG_DECRYPTED) &&
943 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 944 return RX_CONTINUE;
3017b80b 945
761ab470 946 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 947
948 if (rx->skb->len < 8 + hdrlen)
e4c26add 949 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 950
951 /*
952 * no need to call ieee80211_wep_get_keyidx,
953 * it verifies a bunch of things we've done already
954 */
39184b15
ZY		 955 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
956 keyidx = keyid >> 6;
3017b80b 957
d4e46a3d 958 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 959
960 /*
961 * RSNA-protected unicast frames should always be sent with
962 * pairwise or station-to-station keys, but for WEP we allow
963 * using a key index as well.
964 */
97359d12
JB		 965 if (rx->key && rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
966 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
3017b80b
JB		 967 !is_multicast_ether_addr(hdr->addr1))
968 rx->key = NULL;
571ecf67
JB		 969 }
970
3017b80b 971 if (rx->key) {
571ecf67 972 rx->key->tx_rx_count++;
011bfcc4 973 /* TODO: add threshold stuff again */
1990af8d 974 } else {
e4c26add 975 return RX_DROP_MONITOR;
70f08765
JB		 976 }
977
39184b15
ZY		 978 if (skb_linearize(rx->skb))
979 return RX_DROP_UNUSABLE;
761ab470 980 /* the hdr variable is invalid now! */
1990af8d 981
97359d12
JB		 982 switch (rx->key->conf.cipher) {
983 case WLAN_CIPHER_SUITE_WEP40:
984 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 985 /* Check for weak IVs if possible */
986 if (rx->sta && ieee80211_is_data(fc) &&
987 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
988 !(status->flag & RX_FLAG_DECRYPTED)) &&
989 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
990 rx->sta->wep_weak_iv_count++;
991
e2f036da
MN		 992 result = ieee80211_crypto_wep_decrypt(rx);
993 break;
97359d12 994 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 995 result = ieee80211_crypto_tkip_decrypt(rx);
996 break;
97359d12 997 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 998 result = ieee80211_crypto_ccmp_decrypt(rx);
999 break;
97359d12 1000 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1001 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1002 break;
3ffc2a90
JB		 1003 default:
1004 /*
1005 * We can reach here only with HW-only algorithms
1006 * but why didn't it decrypt the frame?!
1007 */
1008 return RX_DROP_UNUSABLE;
70f08765
JB		 1009 }
1010
e2f036da 1011 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1012 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1013
1014 return result;
70f08765
JB		 1015}
1016
572e0012
KV		 1017static ieee80211_rx_result debug_noinline
1018ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1019{
1020 struct ieee80211_local *local;
1021 struct ieee80211_hdr *hdr;
1022 struct sk_buff *skb;
1023
1024 local = rx->local;
1025 skb = rx->skb;
1026 hdr = (struct ieee80211_hdr *) skb->data;
1027
1028 if (!local->pspolling)
1029 return RX_CONTINUE;
1030
1031 if (!ieee80211_has_fromds(hdr->frame_control))
1032 /* this is not from AP */
1033 return RX_CONTINUE;
1034
1035 if (!ieee80211_is_data(hdr->frame_control))
1036 return RX_CONTINUE;
1037
1038 if (!ieee80211_has_moredata(hdr->frame_control)) {
1039 /* AP has no more frames buffered for us */
1040 local->pspolling = false;
1041 return RX_CONTINUE;
1042 }
1043
1044 /* more data bit is set, let's request a new frame from the AP */
1045 ieee80211_send_pspoll(local, rx->sdata);
1046
1047 return RX_CONTINUE;
1048}
1049
133b8226 1050static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1051{
133b8226 1052 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1053 struct ieee80211_local *local = sdata->local;
0795af57 1054
3e122be0 1055 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1056 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1057 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1058#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1059 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1060 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1061#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1062}
1063
ff9458d3 1064static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1065{
133b8226 1066 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1067
3e122be0 1068 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1069
af818581 1070 clear_sta_flags(sta, WLAN_STA_PS_STA);
004c872e 1071
571ecf67 1072#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1073 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1074 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1075#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1076
af818581 1077 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1078#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1079 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1080 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1081#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1082 return;
1083 }
1084
1085 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1086}
1087
49461622 1088static ieee80211_rx_result debug_noinline
5cf121c3 1089ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1090{
1091 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1092 struct sk_buff *skb = rx->skb;
1093 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1094 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1095
1096 if (!sta)
9ae54c84 1097 return RX_CONTINUE;
571ecf67 1098
b291ba11
JB		 1099 /*
1100 * Update last_rx only for IBSS packets which are for the current
1101 * BSSID to avoid keeping the current IBSS network alive in cases
1102 * where other STAs start using different BSSID.
1103 */
05c914fe 1104 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1105 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1106 NL80211_IFTYPE_ADHOC);
46900298 1107 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1108 sta->last_rx = jiffies;
b291ba11
JB		 1109 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1110 /*
33b64eb2
LCC		 1111 * Mesh beacons will update last_rx when if they are found to
1112 * match the current local configuration when processed.
571ecf67 1113 */
b291ba11 1114 sta->last_rx = jiffies;
571ecf67
JB		 1115 }
1116
5cf121c3 1117 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1118 return RX_CONTINUE;
571ecf67 1119
3cf335d5
KV		 1120 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1121 ieee80211_sta_rx_notify(rx->sdata, hdr);
1122
571ecf67
JB		 1123 sta->rx_fragments++;
1124 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1125 sta->last_signal = status->signal;
571ecf67 1126
72eaa43a
JB		 1127 /*
1128 * Change STA power saving mode only at the end of a frame
1129 * exchange sequence.
1130 */
3e122be0 1131 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 1132 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1133 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1134 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1135 /*
1136 * Ignore doze->wake transitions that are
1137 * indicated by non-data frames, the standard
1138 * is unclear here, but for example going to
1139 * PS mode and then scanning would cause a
1140 * doze->wake transition for the probe request,
1141 * and that is clearly undesirable.
1142 */
1143 if (ieee80211_is_data(hdr->frame_control) &&
1144 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1145 ap_sta_ps_end(sta);
72eaa43a
JB		 1146 } else {
1147 if (ieee80211_has_pm(hdr->frame_control))
1148 ap_sta_ps_start(sta);
1149 }
571ecf67
JB		 1150 }
1151
22403def
JB		 1152 /*
1153 * Drop (qos-)data::nullfunc frames silently, since they
1154 * are used only to control station power saving mode.
1155 */
1156 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1157 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1158 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1159
1160 /*
1161 * If we receive a 4-addr nullfunc frame from a STA
1162 * that was not moved to a 4-addr STA vlan yet, drop
1163 * the frame to the monitor interface, to make sure
1164 * that hostapd sees it
1165 */
1166 if (ieee80211_has_a4(hdr->frame_control) &&
1167 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1168 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1169 !rx->sdata->u.vlan.sta)))
1170 return RX_DROP_MONITOR;
22403def
JB		 1171 /*
1172 * Update counter and free packet here to avoid
1173 * counting this as a dropped packed.
1174 */
571ecf67
JB		 1175 sta->rx_packets++;
1176 dev_kfree_skb(rx->skb);
9ae54c84 1177 return RX_QUEUED;
571ecf67
JB		 1178 }
1179
9ae54c84 1180 return RX_CONTINUE;
571ecf67
JB		 1181} /* ieee80211_rx_h_sta_process */
1182
571ecf67
JB		 1183static inline struct ieee80211_fragment_entry *
1184ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1185 unsigned int frag, unsigned int seq, int rx_queue,
1186 struct sk_buff **skb)
1187{
1188 struct ieee80211_fragment_entry *entry;
1189 int idx;
1190
1191 idx = sdata->fragment_next;
1192 entry = &sdata->fragments[sdata->fragment_next++];
1193 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1194 sdata->fragment_next = 0;
1195
1196 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1197#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1198 struct ieee80211_hdr *hdr =
1199 (struct ieee80211_hdr *) entry->skb_list.next->data;
1200 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1201 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1202 "addr1=%pM addr2=%pM\n",
47846c9b 1203 sdata->name, idx,
571ecf67 1204 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1205 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1206#endif
571ecf67
JB		 1207 __skb_queue_purge(&entry->skb_list);
1208 }
1209
1210 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1211 *skb = NULL;
1212 entry->first_frag_time = jiffies;
1213 entry->seq = seq;
1214 entry->rx_queue = rx_queue;
1215 entry->last_frag = frag;
1216 entry->ccmp = 0;
1217 entry->extra_len = 0;
1218
1219 return entry;
1220}
1221
1222static inline struct ieee80211_fragment_entry *
1223ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1224 unsigned int frag, unsigned int seq,
571ecf67
JB		 1225 int rx_queue, struct ieee80211_hdr *hdr)
1226{
1227 struct ieee80211_fragment_entry *entry;
1228 int i, idx;
1229
1230 idx = sdata->fragment_next;
1231 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1232 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1233
1234 idx--;
1235 if (idx < 0)
1236 idx = IEEE80211_FRAGMENT_MAX - 1;
1237
1238 entry = &sdata->fragments[idx];
1239 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1240 entry->rx_queue != rx_queue ||
1241 entry->last_frag + 1 != frag)
1242 continue;
1243
b73d70ad 1244 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1245
b73d70ad
HH		 1246 /*
1247 * Check ftype and addresses are equal, else check next fragment
1248 */
1249 if (((hdr->frame_control ^ f_hdr->frame_control) &
1250 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1251 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1252 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1253 continue;
1254
ab46623e 1255 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1256 __skb_queue_purge(&entry->skb_list);
1257 continue;
1258 }
1259 return entry;
1260 }
1261
1262 return NULL;
1263}
1264
49461622 1265static ieee80211_rx_result debug_noinline
5cf121c3 1266ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1267{
1268 struct ieee80211_hdr *hdr;
1269 u16 sc;
358c8d9d 1270 __le16 fc;
571ecf67
JB		 1271 unsigned int frag, seq;
1272 struct ieee80211_fragment_entry *entry;
1273 struct sk_buff *skb;
1274
b73d70ad 1275 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1276 fc = hdr->frame_control;
571ecf67
JB		 1277 sc = le16_to_cpu(hdr->seq_ctrl);
1278 frag = sc & IEEE80211_SCTL_FRAG;
1279
358c8d9d 1280 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1281 (rx->skb)->len < 24 ||
1282 is_multicast_ether_addr(hdr->addr1))) {
1283 /* not fragmented */
1284 goto out;
1285 }
1286 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1287
e3cf8b3f
ZY		 1288 if (skb_linearize(rx->skb))
1289 return RX_DROP_UNUSABLE;
1290
058897a4
AK		 1291 /*
1292 * skb_linearize() might change the skb->data and
1293 * previously cached variables (in this case, hdr) need to
1294 * be refreshed with the new data.
1295 */
1296 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1297 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1298
1299 if (frag == 0) {
1300 /* This is the first fragment of a new frame. */
1301 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1302 rx->queue, &(rx->skb));
97359d12 1303 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1304 ieee80211_has_protected(fc)) {
9190252c
JM		 1305 int queue = ieee80211_is_mgmt(fc) ?
1306 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1307 /* Store CCMP PN so that we can verify that the next
1308 * fragment has a sequential PN value. */
1309 entry->ccmp = 1;
1310 memcpy(entry->last_pn,
9190252c 1311 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1312 CCMP_PN_LEN);
1313 }
9ae54c84 1314 return RX_QUEUED;
571ecf67
JB		 1315 }
1316
1317 /* This is a fragment for a frame that should already be pending in
1318 * fragment cache. Add this fragment to the end of the pending entry.
1319 */
b73d70ad 1320 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1321 if (!entry) {
1322 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1323 return RX_DROP_MONITOR;
571ecf67
JB		 1324 }
1325
1326 /* Verify that MPDUs within one MSDU have sequential PN values.
1327 * (IEEE 802.11i, 8.3.3.4.5) */
1328 if (entry->ccmp) {
1329 int i;
1330 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1331 int queue;
97359d12 1332 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1333 return RX_DROP_UNUSABLE;
571ecf67
JB		 1334 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1335 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1336 pn[i]++;
1337 if (pn[i])
1338 break;
1339 }
9190252c
JM		 1340 queue = ieee80211_is_mgmt(fc) ?
1341 NUM_RX_DATA_QUEUES : rx->queue;
1342 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1343 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1344 return RX_DROP_UNUSABLE;
571ecf67
JB		 1345 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1346 }
1347
358c8d9d 1348 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1349 __skb_queue_tail(&entry->skb_list, rx->skb);
1350 entry->last_frag = frag;
1351 entry->extra_len += rx->skb->len;
358c8d9d 1352 if (ieee80211_has_morefrags(fc)) {
571ecf67 1353 rx->skb = NULL;
9ae54c84 1354 return RX_QUEUED;
571ecf67
JB		 1355 }
1356
1357 rx->skb = __skb_dequeue(&entry->skb_list);
1358 if (skb_tailroom(rx->skb) < entry->extra_len) {
1359 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1360 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1361 GFP_ATOMIC))) {
1362 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1363 __skb_queue_purge(&entry->skb_list);
e4c26add 1364 return RX_DROP_UNUSABLE;
571ecf67
JB		 1365 }
1366 }
1367 while ((skb = __skb_dequeue(&entry->skb_list))) {
1368 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1369 dev_kfree_skb(skb);
1370 }
1371
1372 /* Complete frame has been reassembled - process it now */
5cf121c3 1373 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1374
1375 out:
1376 if (rx->sta)
1377 rx->sta->rx_packets++;
1378 if (is_multicast_ether_addr(hdr->addr1))
1379 rx->local->dot11MulticastReceivedFrameCount++;
1380 else
1381 ieee80211_led_rx(rx->local);
9ae54c84 1382 return RX_CONTINUE;
571ecf67
JB		 1383}
1384
49461622 1385static ieee80211_rx_result debug_noinline
5cf121c3 1386ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1387{
af818581 1388 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1389 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1390
358c8d9d 1391 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1392 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1393 return RX_CONTINUE;
571ecf67 1394
05c914fe
JB		 1395 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1396 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1397 return RX_DROP_UNUSABLE;
98f0b0a3 1398
af818581
JB		 1399 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1400 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1401 else
1402 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1403
9ae54c84 1404 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1405 * count as an dropped frame. */
1406 dev_kfree_skb(rx->skb);
1407
9ae54c84 1408 return RX_QUEUED;
571ecf67
JB		 1409}
1410
49461622 1411static ieee80211_rx_result debug_noinline
5cf121c3 1412ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1413{
6e0d114d 1414 u8 *data = rx->skb->data;
238f74a2 1415 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1416
238f74a2 1417 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1418 return RX_CONTINUE;
6e0d114d
JB		 1419
1420 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1421 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1422 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1423 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1424 /* change frame type to non QOS */
238f74a2 1425 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1426
9ae54c84 1427 return RX_CONTINUE;
6e0d114d
JB		 1428}
1429
76ee65bf 1430static int
5cf121c3 1431ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1432{
07346f81 1433 if (unlikely(!rx->sta ||
f4ea83dd 1434 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1435 return -EACCES;
571ecf67 1436
76ee65bf 1437 return 0;
571ecf67
JB		 1438}
1439
76ee65bf 1440static int
358c8d9d 1441ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1442{
eb9fb5b8
JB		 1443 struct sk_buff *skb = rx->skb;
1444 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1445
3017b80b 1446 /*
7848ba7d
JB		 1447 * Pass through unencrypted frames if the hardware has
1448 * decrypted them already.
3017b80b 1449 */
eb9fb5b8 1450 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1451 return 0;
571ecf67
JB		 1452
1453 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1454 if (unlikely(!ieee80211_has_protected(fc) &&
1455 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1456 ieee80211_is_data(fc) &&
b3fc9c6c 1457 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1458 return -EACCES;
bef5d1c7
JB		 1459
1460 return 0;
1461}
1462
1463static int
1464ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1465{
1466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1467 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1468 __le16 fc = hdr->frame_control;
bef5d1c7 1469
e3efca0a
JM		 1470 /*
1471 * Pass through unencrypted frames if the hardware has
1472 * decrypted them already.
1473 */
1474 if (status->flag & RX_FLAG_DECRYPTED)
1475 return 0;
bef5d1c7 1476
f2ca3ea4 1477 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1478 if (unlikely(!ieee80211_has_protected(fc) &&
1479 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
f2ca3ea4
JM		 1480 rx->key))
1481 return -EACCES;
1482 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1483 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
fa83a218 1484 ieee80211_get_mmie_keyidx(rx->skb) < 0))
f2ca3ea4
JM		 1485 return -EACCES;
1486 /*
1487 * When using MFP, Action frames are not allowed prior to
1488 * having configured keys.
1489 */
1490 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1491 ieee80211_is_robust_mgmt_frame(
1492 (struct ieee80211_hdr *) rx->skb->data)))
1493 return -EACCES;
1494 }
b3fc9c6c 1495
76ee65bf 1496 return 0;
571ecf67
JB		 1497}
1498
76ee65bf 1499static int
e31a16d6 1500__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1501{
eb9fb5b8 1502 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee
FF		 1503 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1504
9bc383de
JB		 1505 if (ieee80211_has_a4(hdr->frame_control) &&
1506 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1507 return -1;
9bc383de
JB		 1508
1509 if (is_multicast_ether_addr(hdr->addr1) &&
1510 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1511 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
f14543ee 1512 return -1;
571ecf67 1513
47846c9b 1514 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
76ee65bf 1515}
571ecf67 1516
ce3edf6d
JB		 1517/*
1518 * requires that rx->skb is a frame with ethernet header
1519 */
358c8d9d 1520static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1521{
c97c23e3 1522 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1523 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1524 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1525
1526 /*
1527 * Allow EAPOL frames to us/the PAE group address regardless
1528 * of whether the frame was encrypted or not.
1529 */
a621fa4d 1530 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1531 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1532 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1533 return true;
1534
1535 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1536 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1537 return false;
1538
1539 return true;
1540}
1541
1542/*
1543 * requires that rx->skb is a frame with ethernet header
1544 */
76ee65bf 1545static void
5cf121c3 1546ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1547{
eb9fb5b8
JB		 1548 struct ieee80211_sub_if_data *sdata = rx->sdata;
1549 struct net_device *dev = sdata->dev;
76ee65bf 1550 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1551 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1552 struct sta_info *dsta;
571ecf67 1553
76ee65bf
RR		 1554 skb = rx->skb;
1555 xmit_skb = NULL;
571ecf67 1556
05c914fe
JB		 1557 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1558 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1559 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
9bc383de
JB		 1560 (rx->flags & IEEE80211_RX_RA_MATCH) &&
1561 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1562 if (is_multicast_ether_addr(ehdr->h_dest)) {
1563 /*
1564 * send multicast frames both to higher layers in
1565 * local net stack and back to the wireless medium
1566 */
76ee65bf
RR		 1567 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1568 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1569 printk(KERN_DEBUG "%s: failed to clone "
1570 "multicast frame\n", dev->name);
1571 } else {
abe60632
JB		 1572 dsta = sta_info_get(sdata, skb->data);
1573 if (dsta) {
ce3edf6d
JB		 1574 /*
1575 * The destination station is associated to
1576 * this AP (in this VLAN), so send the frame
1577 * directly to it and do not pass it to local
1578 * net stack.
571ecf67 1579 */
76ee65bf 1580 xmit_skb = skb;
571ecf67
JB		 1581 skb = NULL;
1582 }
571ecf67
JB		 1583 }
1584 }
1585
1586 if (skb) {
d1c3a37c
JB		 1587 int align __maybe_unused;
1588
59d9cb07 1589#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1590 /*
1591 * 'align' will only take the values 0 or 2 here
1592 * since all frames are required to be aligned
1593 * to 2-byte boundaries when being passed to
1594 * mac80211. That also explains the __skb_push()
1595 * below.
1596 */
dacb6f1d 1597 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1598 if (align) {
1599 if (WARN_ON(skb_headroom(skb) < 3)) {
1600 dev_kfree_skb(skb);
1601 skb = NULL;
1602 } else {
1603 u8 *data = skb->data;
8ce0b589
ZY		 1604 size_t len = skb_headlen(skb);
1605 skb->data -= align;
1606 memmove(skb->data, data, len);
1607 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1608 }
1609 }
1610#endif
1611
1612 if (skb) {
1613 /* deliver to local stack */
1614 skb->protocol = eth_type_trans(skb, dev);
1615 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1616 netif_receive_skb(skb);
d1c3a37c 1617 }
571ecf67
JB		 1618 }
1619
76ee65bf 1620 if (xmit_skb) {
571ecf67 1621 /* send to wireless media */
f831e909 1622 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1623 skb_reset_network_header(xmit_skb);
1624 skb_reset_mac_header(xmit_skb);
76ee65bf 1625 dev_queue_xmit(xmit_skb);
571ecf67 1626 }
76ee65bf
RR		 1627}
1628
49461622 1629static ieee80211_rx_result debug_noinline
5cf121c3 1630ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1631{
eb9fb5b8 1632 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1633 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1634 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1635 __le16 fc = hdr->frame_control;
eaf85ca7 1636 struct sk_buff_head frame_list;
fd4c7f2f 1637
358c8d9d 1638 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1639 return RX_CONTINUE;
fd4c7f2f 1640
358c8d9d 1641 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1642 return RX_DROP_MONITOR;
fd4c7f2f 1643
5cf121c3 1644 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1645 return RX_CONTINUE;
fd4c7f2f 1646
eaf85ca7
ZY		 1647 if (ieee80211_has_a4(hdr->frame_control) &&
1648 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1649 !rx->sdata->u.vlan.sta)
e4c26add 1650 return RX_DROP_UNUSABLE;
fd4c7f2f 1651
eaf85ca7
ZY		 1652 if (is_multicast_ether_addr(hdr->addr1) &&
1653 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1654 rx->sdata->u.vlan.sta) ||
1655 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1656 rx->sdata->u.mgd.use_4addr)))
e4c26add 1657 return RX_DROP_UNUSABLE;
fd4c7f2f 1658
eaf85ca7
ZY		 1659 skb->dev = dev;
1660 __skb_queue_head_init(&frame_list);
fd4c7f2f 1661
e3cf8b3f
ZY		 1662 if (skb_linearize(skb))
1663 return RX_DROP_UNUSABLE;
1664
eaf85ca7
ZY		 1665 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1666 rx->sdata->vif.type,
1667 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1668
eaf85ca7
ZY		 1669 while (!skb_queue_empty(&frame_list)) {
1670 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1671
358c8d9d 1672 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1673 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1674 continue;
1675 }
eaf85ca7
ZY		 1676 dev->stats.rx_packets++;
1677 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1678
1679 ieee80211_deliver_skb(rx);
1680 }
1681
9ae54c84 1682 return RX_QUEUED;
fd4c7f2f
RR		 1683}
1684
bf94e17b 1685#ifdef CONFIG_MAC80211_MESH
b0dee578 1686static ieee80211_rx_result
e32f85f7
LCC		 1687ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1688{
1689 struct ieee80211_hdr *hdr;
1690 struct ieee80211s_hdr *mesh_hdr;
1691 unsigned int hdrlen;
1692 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1693 struct ieee80211_local *local = rx->local;
eb9fb5b8 1694 struct ieee80211_sub_if_data *sdata = rx->sdata;
e32f85f7
LCC		 1695
1696 hdr = (struct ieee80211_hdr *) skb->data;
1697 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1698 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1699
1700 if (!ieee80211_is_data(hdr->frame_control))
1701 return RX_CONTINUE;
1702
1703 if (!mesh_hdr->ttl)
1704 /* illegal frame */
1705 return RX_DROP_MONITOR;
1706
43b7b314 1707 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1708 struct mesh_path *mppath;
43b7b314
JC		 1709 char *proxied_addr;
1710 char *mpp_addr;
1711
1712 if (is_multicast_ether_addr(hdr->addr1)) {
1713 mpp_addr = hdr->addr3;
1714 proxied_addr = mesh_hdr->eaddr1;
1715 } else {
1716 mpp_addr = hdr->addr4;
1717 proxied_addr = mesh_hdr->eaddr2;
1718 }
79617dee 1719
79617dee 1720 rcu_read_lock();
43b7b314 1721 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1722 if (!mppath) {
43b7b314 1723 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1724 } else {
1725 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1726 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1727 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1728 spin_unlock_bh(&mppath->state_lock);
1729 }
1730 rcu_read_unlock();
1731 }
1732
3c5772a5
JC		 1733 /* Frame has reached destination. Don't forward */
1734 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1735 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1736 return RX_CONTINUE;
1737
1738 mesh_hdr->ttl--;
1739
1740 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1741 if (!mesh_hdr->ttl)
472dbc45 1742 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1743 dropped_frames_ttl);
1744 else {
1745 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1746 struct ieee80211_tx_info *info;
1747
e32f85f7
LCC		 1748 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1749
1750 if (!fwd_skb && net_ratelimit())
1751 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1752 sdata->name);
e32f85f7
LCC		 1753
1754 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1755 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1756 info = IEEE80211_SKB_CB(fwd_skb);
1757 memset(info, 0, sizeof(*info));
1758 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1759 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1760 skb_set_queue_mapping(skb,
1761 ieee80211_select_queue(rx->sdata, fwd_skb));
1762 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1763 if (is_multicast_ether_addr(fwd_hdr->addr1))
1764 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1765 fwded_mcast);
1766 else {
3c5772a5
JC		 1767 int err;
1768 /*
1769 * Save TA to addr1 to send TA a path error if a
1770 * suitable next hop is not found
1771 */
1772 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1773 ETH_ALEN);
3c5772a5 1774 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1775 /* Failed to immediately resolve next hop:
1776 * fwded frame was dropped or will be added
1777 * later to the pending skb queue. */
1778 if (err)
1779 return RX_DROP_MONITOR;
c8a61a7d
DW		 1780
1781 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1782 fwded_unicast);
249b405c
JC		 1783 }
1784 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1785 fwded_frames);
3b8d81e0 1786 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1787 }
1788 }
1789
3c5772a5 1790 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1791 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1792 return RX_CONTINUE;
1793 else
1794 return RX_DROP_MONITOR;
1795}
bf94e17b 1796#endif
e32f85f7 1797
49461622 1798static ieee80211_rx_result debug_noinline
5cf121c3 1799ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1800{
eb9fb5b8 1801 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1802 struct ieee80211_local *local = rx->local;
eb9fb5b8 1803 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1804 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1805 __le16 fc = hdr->frame_control;
ce3edf6d 1806 int err;
76ee65bf 1807
358c8d9d 1808 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1809 return RX_CONTINUE;
76ee65bf 1810
358c8d9d 1811 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1812 return RX_DROP_MONITOR;
76ee65bf 1813
f14543ee
FF		 1814 /*
1815 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1816 * that a 4-addr station can be detected and moved into a separate VLAN
1817 */
1818 if (ieee80211_has_a4(hdr->frame_control) &&
1819 sdata->vif.type == NL80211_IFTYPE_AP)
1820 return RX_DROP_MONITOR;
1821
e31a16d6 1822 err = __ieee80211_data_to_8023(rx);
76ee65bf 1823 if (unlikely(err))
e4c26add 1824 return RX_DROP_UNUSABLE;
76ee65bf 1825
358c8d9d 1826 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1827 return RX_DROP_MONITOR;
ce3edf6d 1828
76ee65bf
RR		 1829 rx->skb->dev = dev;
1830
1831 dev->stats.rx_packets++;
1832 dev->stats.rx_bytes += rx->skb->len;
1833
e15276a4
VN		 1834 if (ieee80211_is_data(hdr->frame_control) &&
1835 !is_multicast_ether_addr(hdr->addr1) &&
1836 local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
1837 mod_timer(&local->dynamic_ps_timer, jiffies +
1838 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1839 }
1840
76ee65bf 1841 ieee80211_deliver_skb(rx);
571ecf67 1842
9ae54c84 1843 return RX_QUEUED;
571ecf67
JB		 1844}
1845
49461622 1846static ieee80211_rx_result debug_noinline
2569a826 1847ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716
RR		 1848{
1849 struct ieee80211_local *local = rx->local;
1850 struct ieee80211_hw *hw = &local->hw;
1851 struct sk_buff *skb = rx->skb;
a7767f95 1852 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1853 struct tid_ampdu_rx *tid_agg_rx;
1854 u16 start_seq_num;
1855 u16 tid;
1856
a7767f95 1857 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1858 return RX_CONTINUE;
71364716 1859
a7767f95 1860 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1861 struct {
1862 __le16 control, start_seq_num;
1863 } __packed bar_data;
1864
71364716 1865 if (!rx->sta)
a02ae758 1866 return RX_DROP_MONITOR;
8ae5977f
JB		 1867
1868 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1869 &bar_data, sizeof(bar_data)))
1870 return RX_DROP_MONITOR;
1871
8ae5977f 1872 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1873
1874 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1875 if (!tid_agg_rx)
a02ae758 1876 return RX_DROP_MONITOR;
71364716 1877
8ae5977f 1878 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1879
1880 /* reset session timer */
20ad19d0
JB		 1881 if (tid_agg_rx->timeout)
1882 mod_timer(&tid_agg_rx->session_timer,
1883 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1884
a02ae758 1885 /* release stored frames up to start of BAR */
2569a826
JB		 1886 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1887 frames);
a02ae758
JB		 1888 kfree_skb(skb);
1889 return RX_QUEUED;
71364716
RR		 1890 }
1891
08daecae
JB		 1892 /*
1893 * After this point, we only want management frames,
1894 * so we can drop all remaining control frames to
1895 * cooked monitor interfaces.
1896 */
1897 return RX_DROP_MONITOR;
71364716
RR		 1898}
1899
f4f727a6
JM		 1900static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1901 struct ieee80211_mgmt *mgmt,
1902 size_t len)
fea14732
JM		 1903{
1904 struct ieee80211_local *local = sdata->local;
1905 struct sk_buff *skb;
1906 struct ieee80211_mgmt *resp;
1907
47846c9b 1908 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 1909 /* Not to own unicast address */
1910 return;
1911 }
1912
46900298
JB		 1913 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1914 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1915 /* Not from the current AP or not associated yet. */
fea14732
JM		 1916 return;
1917 }
1918
1919 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1920 /* Too short SA Query request frame */
1921 return;
1922 }
1923
1924 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1925 if (skb == NULL)
1926 return;
1927
1928 skb_reserve(skb, local->hw.extra_tx_headroom);
1929 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1930 memset(resp, 0, 24);
1931 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 1932 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 1933 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1934 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1935 IEEE80211_STYPE_ACTION);
1936 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1937 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1938 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1939 memcpy(resp->u.action.u.sa_query.trans_id,
1940 mgmt->u.action.u.sa_query.trans_id,
1941 WLAN_SA_QUERY_TR_ID_LEN);
1942
62ae67be 1943 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 1944}
1945
2e161f78
JB		 1946static ieee80211_rx_result debug_noinline
1947ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
1948{
1949 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1950
1951 /*
1952 * From here on, look only at management frames.
1953 * Data and control frames are already handled,
1954 * and unknown (reserved) frames are useless.
1955 */
1956 if (rx->skb->len < 24)
1957 return RX_DROP_MONITOR;
1958
1959 if (!ieee80211_is_mgmt(mgmt->frame_control))
1960 return RX_DROP_MONITOR;
1961
1962 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1963 return RX_DROP_MONITOR;
1964
1965 if (ieee80211_drop_unencrypted_mgmt(rx))
1966 return RX_DROP_UNUSABLE;
1967
1968 return RX_CONTINUE;
1969}
1970
de1ede7a
JB		 1971static ieee80211_rx_result debug_noinline
1972ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1973{
1974 struct ieee80211_local *local = rx->local;
eb9fb5b8 1975 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a
JB		 1976 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1977 int len = rx->skb->len;
1978
1979 if (!ieee80211_is_action(mgmt->frame_control))
1980 return RX_CONTINUE;
1981
026331c4
JM		 1982 /* drop too small frames */
1983 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 1984 return RX_DROP_UNUSABLE;
de1ede7a 1985
026331c4 1986 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 1987 return RX_DROP_UNUSABLE;
de1ede7a 1988
026331c4 1989 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
84040805 1990 return RX_DROP_UNUSABLE;
97ebe12a 1991
de1ede7a
JB		 1992 switch (mgmt->u.action.category) {
1993 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1994 /*
1995 * The aggregation code is not prepared to handle
1996 * anything but STA/AP due to the BSSID handling;
1997 * IBSS could work in the code but isn't supported
1998 * by drivers or the standard.
1999 */
2000 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2001 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2002 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2003 break;
8abd3f9b 2004
026331c4
JM		 2005 /* verify action_code is present */
2006 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2007 break;
2008
de1ede7a
JB		 2009 switch (mgmt->u.action.u.addba_req.action_code) {
2010 case WLAN_ACTION_ADDBA_REQ:
2011 if (len < (IEEE80211_MIN_ACTION_SIZE +
2012 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2013 goto invalid;
2014 break;
de1ede7a
JB		 2015 case WLAN_ACTION_ADDBA_RESP:
2016 if (len < (IEEE80211_MIN_ACTION_SIZE +
2017 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2018 goto invalid;
2019 break;
de1ede7a
JB		 2020 case WLAN_ACTION_DELBA:
2021 if (len < (IEEE80211_MIN_ACTION_SIZE +
2022 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2023 goto invalid;
2024 break;
2025 default:
2026 goto invalid;
de1ede7a 2027 }
bed7ee6e 2028
8b58ff83 2029 goto queue;
39192c0b
JB		 2030 case WLAN_CATEGORY_SPECTRUM_MGMT:
2031 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2032 break;
46900298
JB		 2033
2034 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2035 break;
46900298 2036
026331c4
JM		 2037 /* verify action_code is present */
2038 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2039 break;
2040
39192c0b
JB		 2041 switch (mgmt->u.action.u.measurement.action_code) {
2042 case WLAN_ACTION_SPCT_MSR_REQ:
2043 if (len < (IEEE80211_MIN_ACTION_SIZE +
2044 sizeof(mgmt->u.action.u.measurement)))
84040805 2045 break;
39192c0b 2046 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2047 goto handled;
c481ec97
S		 2048 case WLAN_ACTION_SPCT_CHL_SWITCH:
2049 if (len < (IEEE80211_MIN_ACTION_SIZE +
2050 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2051 break;
c481ec97 2052
cc32abd4 2053 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2054 break;
cc32abd4 2055
46900298 2056 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2057 break;
c481ec97 2058
8b58ff83 2059 goto queue;
39192c0b
JB		 2060 }
2061 break;
fea14732
JM		 2062 case WLAN_CATEGORY_SA_QUERY:
2063 if (len < (IEEE80211_MIN_ACTION_SIZE +
2064 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2065 break;
2066
fea14732
JM		 2067 switch (mgmt->u.action.u.sa_query.action) {
2068 case WLAN_ACTION_SA_QUERY_REQUEST:
2069 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2070 break;
fea14732 2071 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2072 goto handled;
fea14732
JM		 2073 }
2074 break;
97ad9139
JC		 2075 case WLAN_CATEGORY_MESH_PLINK:
2076 case WLAN_CATEGORY_MESH_PATH_SEL:
77a121c3
JB		 2077 if (!ieee80211_vif_is_mesh(&sdata->vif))
2078 break;
8b58ff83 2079 goto queue;
84040805 2080 }
026331c4 2081
2e161f78
JB		 2082 return RX_CONTINUE;
2083
bed7ee6e 2084 invalid:
2e161f78
JB		 2085 rx->flags |= IEEE80211_MALFORMED_ACTION_FRM;
2086 /* will return in the next handlers */
2087 return RX_CONTINUE;
2088
2089 handled:
2090 if (rx->sta)
2091 rx->sta->rx_packets++;
2092 dev_kfree_skb(rx->skb);
2093 return RX_QUEUED;
2094
2095 queue:
2096 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2097 skb_queue_tail(&sdata->skb_queue, rx->skb);
2098 ieee80211_queue_work(&local->hw, &sdata->work);
2099 if (rx->sta)
2100 rx->sta->rx_packets++;
2101 return RX_QUEUED;
2102}
2103
2104static ieee80211_rx_result debug_noinline
2105ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2106{
2107 struct ieee80211_rx_status *status;
2108
2109 /* skip known-bad action frames and return them in the next handler */
2110 if (rx->flags & IEEE80211_MALFORMED_ACTION_FRM)
2111 return RX_CONTINUE;
d7907448 2112
026331c4
JM		 2113 /*
2114 * Getting here means the kernel doesn't know how to handle
2115 * it, but maybe userspace does ... include returned frames
2116 * so userspace can register for those to know whether ones
2117 * it transmitted were processed or returned.
2118 */
2119 status = IEEE80211_SKB_RXCB(rx->skb);
2120
2e161f78
JB		 2121 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2122 rx->skb->data, rx->skb->len,
2123 GFP_ATOMIC)) {
2124 if (rx->sta)
2125 rx->sta->rx_packets++;
2126 dev_kfree_skb(rx->skb);
2127 return RX_QUEUED;
2128 }
2129
2130
2131 return RX_CONTINUE;
2132}
2133
2134static ieee80211_rx_result debug_noinline
2135ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2136{
2137 struct ieee80211_local *local = rx->local;
2138 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2139 struct sk_buff *nskb;
2140 struct ieee80211_sub_if_data *sdata = rx->sdata;
2141
2142 if (!ieee80211_is_action(mgmt->frame_control))
2143 return RX_CONTINUE;
2144
2145 /*
2146 * For AP mode, hostapd is responsible for handling any action
2147 * frames that we didn't handle, including returning unknown
2148 * ones. For all other modes we will return them to the sender,
2149 * setting the 0x80 bit in the action category, as required by
2150 * 802.11-2007 7.3.1.11.
2151 * Newer versions of hostapd shall also use the management frame
2152 * registration mechanisms, but older ones still use cooked
2153 * monitor interfaces so push all frames there.
2154 */
2155 if (!(rx->flags & IEEE80211_MALFORMED_ACTION_FRM) &&
2156 (sdata->vif.type == NL80211_IFTYPE_AP ||
2157 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2158 return RX_DROP_MONITOR;
026331c4 2159
84040805
JB		 2160 /* do not return rejected action frames */
2161 if (mgmt->u.action.category & 0x80)
2162 return RX_DROP_UNUSABLE;
2163
2164 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2165 GFP_ATOMIC);
2166 if (nskb) {
292b4df6 2167 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2168
292b4df6
JL		 2169 nmgmt->u.action.category |= 0x80;
2170 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2171 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2172
2173 memset(nskb->cb, 0, sizeof(nskb->cb));
2174
2175 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2176 }
39192c0b
JB		 2177 dev_kfree_skb(rx->skb);
2178 return RX_QUEUED;
de1ede7a
JB		 2179}
2180
49461622 2181static ieee80211_rx_result debug_noinline
5cf121c3 2182ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2183{
eb9fb5b8 2184 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2185 ieee80211_rx_result rxs;
77a121c3
JB		 2186 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2187 __le16 stype;
571ecf67 2188
af6b6374
JB		 2189 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2190 if (rxs != RX_CONTINUE)
2191 return rxs;
2192
77a121c3 2193 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2194
77a121c3
JB		 2195 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2196 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2197 sdata->vif.type != NL80211_IFTYPE_STATION)
2198 return RX_DROP_MONITOR;
472dbc45 2199
77a121c3
JB		 2200 switch (stype) {
2201 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2202 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2203 /* process for all: mesh, mlme, ibss */
2204 break;
2205 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2206 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2207 /* process only for station */
2208 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2209 return RX_DROP_MONITOR;
2210 break;
2211 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2212 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2213 /* process only for ibss */
2214 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2215 return RX_DROP_MONITOR;
2216 break;
2217 default:
2218 return RX_DROP_MONITOR;
2219 }
f9d540ee 2220
77a121c3 2221 /* queue up frame and kick off work to process it */
c1475ca9 2222 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2223 skb_queue_tail(&sdata->skb_queue, rx->skb);
2224 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2225 if (rx->sta)
2226 rx->sta->rx_packets++;
46900298 2227
77a121c3 2228 return RX_QUEUED;
571ecf67
JB		 2229}
2230
3b8d81e0 2231static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2232 struct ieee80211_rx_data *rx)
571ecf67 2233{
a7767f95
HH		 2234 int keyidx;
2235 unsigned int hdrlen;
571ecf67 2236
a7767f95 2237 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2238 if (rx->skb->len >= hdrlen + 4)
2239 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2240 else
2241 keyidx = -1;
2242
8944b79f 2243 if (!rx->sta) {
aa0daf0e
JB		 2244 /*
2245 * Some hardware seem to generate incorrect Michael MIC
2246 * reports; ignore them to avoid triggering countermeasures.
2247 */
af2ced6a 2248 return;
571ecf67
JB		 2249 }
2250
a7767f95 2251 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2252 return;
571ecf67 2253
05c914fe 2254 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2255 /*
2256 * APs with pairwise keys should never receive Michael MIC
2257 * errors for non-zero keyidx because these are reserved for
2258 * group keys and only the AP is sending real multicast
2259 * frames in the BSS.
2260 */
af2ced6a 2261 return;
571ecf67
JB		 2262 }
2263
a7767f95
HH		 2264 if (!ieee80211_is_data(hdr->frame_control) &&
2265 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2266 return;
571ecf67 2267
e6d6e342
JB		 2268 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2269 GFP_ATOMIC);
571ecf67
JB		 2270}
2271
5cf121c3 2272/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2273static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2274 struct ieee80211_rate *rate)
3d30d949
MW		 2275{
2276 struct ieee80211_sub_if_data *sdata;
2277 struct ieee80211_local *local = rx->local;
2278 struct ieee80211_rtap_hdr {
2279 struct ieee80211_radiotap_header hdr;
2280 u8 flags;
5f0b7de5 2281 u8 rate_or_pad;
3d30d949
MW		 2282 __le16 chan_freq;
2283 __le16 chan_flags;
bc10502d 2284 } __packed *rthdr;
3d30d949
MW		 2285 struct sk_buff *skb = rx->skb, *skb2;
2286 struct net_device *prev_dev = NULL;
eb9fb5b8 2287 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2288
8c0c709e 2289 if (status->flag & RX_FLAG_INTERNAL_CMTR)
3d30d949
MW		 2290 goto out_free_skb;
2291
2292 if (skb_headroom(skb) < sizeof(*rthdr) &&
2293 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2294 goto out_free_skb;
2295
2296 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2297 memset(rthdr, 0, sizeof(*rthdr));
2298 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2299 rthdr->hdr.it_present =
2300 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2301 (1 << IEEE80211_RADIOTAP_CHANNEL));
2302
5f0b7de5
JB		 2303 if (rate) {
2304 rthdr->rate_or_pad = rate->bitrate / 5;
2305 rthdr->hdr.it_present |=
2306 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2307 }
3d30d949
MW		 2308 rthdr->chan_freq = cpu_to_le16(status->freq);
2309
2310 if (status->band == IEEE80211_BAND_5GHZ)
2311 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2312 IEEE80211_CHAN_5GHZ);
2313 else
2314 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2315 IEEE80211_CHAN_2GHZ);
2316
2317 skb_set_mac_header(skb, 0);
2318 skb->ip_summed = CHECKSUM_UNNECESSARY;
2319 skb->pkt_type = PACKET_OTHERHOST;
2320 skb->protocol = htons(ETH_P_802_2);
2321
2322 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2323 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2324 continue;
2325
05c914fe 2326 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2327 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2328 continue;
2329
2330 if (prev_dev) {
2331 skb2 = skb_clone(skb, GFP_ATOMIC);
2332 if (skb2) {
2333 skb2->dev = prev_dev;
5548a8a1 2334 netif_receive_skb(skb2);
3d30d949
MW		 2335 }
2336 }
2337
2338 prev_dev = sdata->dev;
2339 sdata->dev->stats.rx_packets++;
2340 sdata->dev->stats.rx_bytes += skb->len;
2341 }
2342
2343 if (prev_dev) {
2344 skb->dev = prev_dev;
5548a8a1 2345 netif_receive_skb(skb);
3d30d949
MW		 2346 skb = NULL;
2347 } else
2348 goto out_free_skb;
2349
8c0c709e 2350 status->flag |= RX_FLAG_INTERNAL_CMTR;
3d30d949
MW		 2351 return;
2352
2353 out_free_skb:
2354 dev_kfree_skb(skb);
2355}
2356
aa0c8636
CL		 2357static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2358 ieee80211_rx_result res)
2359{
2360 switch (res) {
2361 case RX_DROP_MONITOR:
2362 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2363 if (rx->sta)
2364 rx->sta->rx_dropped++;
2365 /* fall through */
2366 case RX_CONTINUE: {
2367 struct ieee80211_rate *rate = NULL;
2368 struct ieee80211_supported_band *sband;
2369 struct ieee80211_rx_status *status;
2370
2371 status = IEEE80211_SKB_RXCB((rx->skb));
2372
2373 sband = rx->local->hw.wiphy->bands[status->band];
2374 if (!(status->flag & RX_FLAG_HT))
2375 rate = &sband->bitrates[status->rate_idx];
2376
2377 ieee80211_rx_cooked_monitor(rx, rate);
2378 break;
2379 }
2380 case RX_DROP_UNUSABLE:
2381 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2382 if (rx->sta)
2383 rx->sta->rx_dropped++;
2384 dev_kfree_skb(rx->skb);
2385 break;
2386 case RX_QUEUED:
2387 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2388 break;
2389 }
2390}
571ecf67 2391
aa0c8636
CL		 2392static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2393 struct sk_buff_head *frames)
58905290 2394{
58905290 2395 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2396 struct sk_buff *skb;
8944b79f 2397
e32f85f7
LCC		 2398#define CALL_RXH(rxh) \
2399 do { \
2400 res = rxh(rx); \
2401 if (res != RX_CONTINUE) \
2569a826 2402 goto rxh_next; \
e32f85f7 2403 } while (0);
49461622 2404
aa0c8636 2405 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2406 /*
2407 * all the other fields are valid across frames
2408 * that belong to an aMPDU since they are on the
2409 * same TID from the same station
2410 */
2411 rx->skb = skb;
2412
2413 CALL_RXH(ieee80211_rx_h_decrypt)
2414 CALL_RXH(ieee80211_rx_h_check_more_data)
2415 CALL_RXH(ieee80211_rx_h_sta_process)
2416 CALL_RXH(ieee80211_rx_h_defragment)
2417 CALL_RXH(ieee80211_rx_h_ps_poll)
2418 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2419 /* must be after MMIC verify so header is counted in MPDU mic */
2420 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2421 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2422#ifdef CONFIG_MAC80211_MESH
aa0c8636 2423 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2424 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2425#endif
2569a826
JB		 2426 CALL_RXH(ieee80211_rx_h_data)
2427
2428 /* special treatment -- needs the queue */
aa0c8636 2429 res = ieee80211_rx_h_ctrl(rx, frames);
2569a826
JB		 2430 if (res != RX_CONTINUE)
2431 goto rxh_next;
2432
2e161f78 2433 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2434 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2435 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2436 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2437 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2438
aa0c8636
CL		 2439 rxh_next:
2440 ieee80211_rx_handlers_result(rx, res);
2441
49461622 2442#undef CALL_RXH
aa0c8636
CL		 2443 }
2444}
2445
2446static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
2447 struct ieee80211_rx_data *rx,
071d9ac2 2448 struct sk_buff *skb)
aa0c8636
CL		 2449{
2450 struct sk_buff_head reorder_release;
2451 ieee80211_rx_result res = RX_DROP_MONITOR;
2452
2453 __skb_queue_head_init(&reorder_release);
2454
2455 rx->skb = skb;
2456 rx->sdata = sdata;
2457
2458#define CALL_RXH(rxh) \
2459 do { \
2460 res = rxh(rx); \
2461 if (res != RX_CONTINUE) \
2462 goto rxh_next; \
2463 } while (0);
2464
2465 CALL_RXH(ieee80211_rx_h_passive_scan)
2466 CALL_RXH(ieee80211_rx_h_check)
2467
2468 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2469
2470 ieee80211_rx_handlers(rx, &reorder_release);
2471 return;
49461622 2472
2569a826 2473 rxh_next:
aa0c8636
CL		 2474 ieee80211_rx_handlers_result(rx, res);
2475
2476#undef CALL_RXH
58905290
JB		 2477}
2478
2bff8ebf
CL		 2479/*
2480 * This function makes calls into the RX path. Therefore the
2481 * caller must hold the sta_info->lock and everything has to
2482 * be under rcu_read_lock protection as well.
2483 */
2484void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2485{
2486 struct sk_buff_head frames;
2487 struct ieee80211_rx_data rx = { };
2c15a0cf
CL		 2488 struct tid_ampdu_rx *tid_agg_rx;
2489
2490 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2491 if (!tid_agg_rx)
2492 return;
2bff8ebf
CL		 2493
2494 __skb_queue_head_init(&frames);
2495
2496 /* construct rx struct */
2497 rx.sta = sta;
2498 rx.sdata = sta->sdata;
2499 rx.local = sta->local;
2500 rx.queue = tid;
2501 rx.flags |= IEEE80211_RX_RA_MATCH;
2502
2503 if (unlikely(test_bit(SCAN_HW_SCANNING, &sta->local->scanning) ||
2504 test_bit(SCAN_OFF_CHANNEL, &sta->local->scanning)))
2505 rx.flags |= IEEE80211_RX_IN_SCAN;
2506
2c15a0cf
CL		 2507 spin_lock(&tid_agg_rx->reorder_lock);
2508 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2509 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf
CL		 2510
2511 ieee80211_rx_handlers(&rx, &frames);
2512}
2513
571ecf67
JB		 2514/* main receive path */
2515
23a24def 2516static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
7ab17c45 2517 struct ieee80211_rx_data *rx,
23a24def
JB		 2518 struct ieee80211_hdr *hdr)
2519{
eb9fb5b8
JB		 2520 struct sk_buff *skb = rx->skb;
2521 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2522 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2523 int multicast = is_multicast_ether_addr(hdr->addr1);
2524
51fb61e7 2525 switch (sdata->vif.type) {
05c914fe 2526 case NL80211_IFTYPE_STATION:
9bc383de 2527 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2528 return 0;
77fdaa12 2529 if (!multicast &&
47846c9b 2530 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2531 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2532 return 0;
5cf121c3 2533 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2534 }
2535 break;
05c914fe 2536 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2537 if (!bssid)
2538 return 0;
a7767f95 2539 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2540 return 1;
87291c02 2541 }
46900298 2542 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
5cf121c3 2543 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2544 return 0;
5cf121c3 2545 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2546 } else if (!multicast &&
47846c9b 2547 compare_ether_addr(sdata->vif.addr,
23a24def 2548 hdr->addr1) != 0) {
4150c572 2549 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2550 return 0;
5cf121c3 2551 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2552 } else if (!rx->sta) {
2553 int rate_idx;
eb9fb5b8 2554 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2555 rate_idx = 0; /* TODO: HT rates */
2556 else
eb9fb5b8 2557 rate_idx = status->rate_idx;
34e89507
JB		 2558 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2559 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2560 }
23a24def 2561 break;
05c914fe 2562 case NL80211_IFTYPE_MESH_POINT:
6032f934 2563 if (!multicast &&
47846c9b 2564 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2565 hdr->addr1) != 0) {
2566 if (!(sdata->dev->flags & IFF_PROMISC))
2567 return 0;
2568
5cf121c3 2569 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2570 }
2571 break;
05c914fe
JB		 2572 case NL80211_IFTYPE_AP_VLAN:
2573 case NL80211_IFTYPE_AP:
23a24def 2574 if (!bssid) {
47846c9b 2575 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2576 hdr->addr1))
2577 return 0;
2578 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2579 sdata->vif.addr)) {
5cf121c3 2580 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2581 return 0;
5cf121c3 2582 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2583 }
23a24def 2584 break;
05c914fe 2585 case NL80211_IFTYPE_WDS:
a7767f95 2586 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2587 return 0;
2588 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2589 return 0;
2590 break;
2ca27bcf 2591 default:
fb1c1cd6
JB		 2592 /* should never get here */
2593 WARN_ON(1);
2594 break;
23a24def
JB		 2595 }
2596
2597 return 1;
2598}
2599
571ecf67 2600/*
6368e4b1
RR		 2601 * This is the actual Rx frames handler. as it blongs to Rx path it must
2602 * be called with rcu_read_lock protection.
571ecf67 2603 */
71ebb4aa 2604static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2605 struct sk_buff *skb)
571ecf67 2606{
f1d58c25 2607 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2608 struct ieee80211_local *local = hw_to_local(hw);
2609 struct ieee80211_sub_if_data *sdata;
571ecf67 2610 struct ieee80211_hdr *hdr;
e3cf8b3f 2611 __le16 fc;
5cf121c3 2612 struct ieee80211_rx_data rx;
6368e4b1 2613 int prepares;
8e6f0032
JB		 2614 struct ieee80211_sub_if_data *prev = NULL;
2615 struct sk_buff *skb_new;
abe60632
JB		 2616 struct sta_info *sta, *tmp;
2617 bool found_sta = false;
e3cf8b3f 2618 int err = 0;
571ecf67 2619
e3cf8b3f 2620 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2621 memset(&rx, 0, sizeof(rx));
2622 rx.skb = skb;
2623 rx.local = local;
72abd81b 2624
e3cf8b3f 2625 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2626 local->dot11ReceivedFragmentCount++;
571ecf67 2627
142b9f50
HS		 2628 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2629 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
5cf121c3 2630 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2631
e3cf8b3f
ZY		 2632 if (ieee80211_is_mgmt(fc))
2633 err = skb_linearize(skb);
2634 else
2635 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2636
2637 if (err) {
2638 dev_kfree_skb(skb);
2639 return;
2640 }
2641
2642 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2643 ieee80211_parse_qos(&rx);
d1c3a37c 2644 ieee80211_verify_alignment(&rx);
38f3714d 2645
e3cf8b3f 2646 if (ieee80211_is_data(fc)) {
abe60632
JB		 2647 for_each_sta_info(local, hdr->addr2, sta, tmp) {
2648 rx.sta = sta;
2649 found_sta = true;
2650 rx.sdata = sta->sdata;
2651
2652 rx.flags |= IEEE80211_RX_RA_MATCH;
2653 prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
2654 if (prepares) {
2655 if (status->flag & RX_FLAG_MMIC_ERROR) {
2656 if (rx.flags & IEEE80211_RX_RA_MATCH)
2657 ieee80211_rx_michael_mic_report(hdr, &rx);
2658 } else
2659 prev = rx.sdata;
2660 }
af2ced6a 2661 }
abe60632
JB		 2662 }
2663 if (!found_sta) {
2664 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2665 if (!ieee80211_sdata_running(sdata))
abe60632 2666 continue;
2a8a9a88 2667
abe60632
JB		 2668 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2669 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2670 continue;
b2e7771e 2671
abe60632
JB		 2672 /*
2673 * frame is destined for this interface, but if it's
2674 * not also for the previous one we handle that after
2675 * the loop to avoid copying the SKB once too much
2676 */
340e11f3 2677
abe60632
JB		 2678 if (!prev) {
2679 prev = sdata;
2680 continue;
2681 }
340e11f3 2682
4754ffd6 2683 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4bb29f8c
FF		 2684
2685 rx.flags |= IEEE80211_RX_RA_MATCH;
2686 prepares = prepare_for_handlers(prev, &rx, hdr);
2687
2688 if (!prepares)
2689 goto next;
2690
2691 if (status->flag & RX_FLAG_MMIC_ERROR) {
2692 rx.sdata = prev;
2693 if (rx.flags & IEEE80211_RX_RA_MATCH)
2694 ieee80211_rx_michael_mic_report(hdr,
2695 &rx);
2696 goto next;
2697 }
2698
abe60632
JB		 2699 /*
2700 * frame was destined for the previous interface
2701 * so invoke RX handlers for it
2702 */
2703
2704 skb_new = skb_copy(skb, GFP_ATOMIC);
2705 if (!skb_new) {
2706 if (net_ratelimit())
0fb9a9ec
JP		 2707 wiphy_debug(local->hw.wiphy,
2708 "failed to copy multicast frame for %s\n",
2709 prev->name);
4bb29f8c 2710 goto next;
abe60632 2711 }
071d9ac2 2712 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
4bb29f8c 2713next:
abe60632 2714 prev = sdata;
340e11f3 2715 }
4bb29f8c
FF		 2716
2717 if (prev) {
4754ffd6 2718 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4bb29f8c
FF		 2719
2720 rx.flags |= IEEE80211_RX_RA_MATCH;
2721 prepares = prepare_for_handlers(prev, &rx, hdr);
2722
2723 if (!prepares)
2724 prev = NULL;
2725 }
571ecf67 2726 }
a4b7d7bd 2727 if (prev)
071d9ac2 2728 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 2729 else
8e6f0032 2730 dev_kfree_skb(skb);
571ecf67 2731}
6368e4b1
RR		 2732
2733/*
2734 * This is the receive path handler. It is called by a low level driver when an
2735 * 802.11 MPDU is received from the hardware.
2736 */
103bf9f7 2737void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2738{
2739 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2740 struct ieee80211_rate *rate = NULL;
2741 struct ieee80211_supported_band *sband;
f1d58c25 2742 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2743
d20ef63d
JB		 2744 WARN_ON_ONCE(softirq_count() == 0);
2745
77a980dc
JB		 2746 if (WARN_ON(status->band < 0 ||
2747 status->band >= IEEE80211_NUM_BANDS))
2748 goto drop;
8318d78a
JB		 2749
2750 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2751 if (WARN_ON(!sband))
2752 goto drop;
8318d78a 2753
89c3a8ac
JB		 2754 /*
2755 * If we're suspending, it is possible although not too likely
2756 * that we'd be receiving frames after having already partially
2757 * quiesced the stack. We can't process such frames then since
2758 * that might, for example, cause stations to be added or other
2759 * driver callbacks be invoked.
2760 */
77a980dc
JB		 2761 if (unlikely(local->quiescing || local->suspended))
2762 goto drop;
89c3a8ac 2763
ea77f12f
JB		 2764 /*
2765 * The same happens when we're not even started,
2766 * but that's worth a warning.
2767 */
77a980dc
JB		 2768 if (WARN_ON(!local->started))
2769 goto drop;
ea77f12f 2770
fc885189 2771 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2772 /*
fc885189
JB		 2773 * Validate the rate, unless a PLCP error means that
2774 * we probably can't have a valid rate here anyway.
e5d6eb83 2775 */
fc885189
JB		 2776
2777 if (status->flag & RX_FLAG_HT) {
2778 /*
2779 * rate_idx is MCS index, which can be [0-76]
2780 * as documented on:
2781 *
2782 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2783 *
2784 * Anything else would be some sort of driver or
2785 * hardware error. The driver should catch hardware
2786 * errors.
2787 */
2788 if (WARN((status->rate_idx < 0 ||
2789 status->rate_idx > 76),
2790 "Rate marked as an HT rate but passed "
2791 "status->rate_idx is not "
2792 "an MCS index [0-76]: %d (0x%02x)\n",
2793 status->rate_idx,
2794 status->rate_idx))
2795 goto drop;
2796 } else {
2797 if (WARN_ON(status->rate_idx < 0 ||
2798 status->rate_idx >= sband->n_bitrates))
2799 goto drop;
2800 rate = &sband->bitrates[status->rate_idx];
2801 }
0fb8ca45 2802 }
6368e4b1
RR		 2803
2804 /*
2805 * key references and virtual interfaces are protected using RCU
2806 * and this requires that we are in a read-side RCU section during
2807 * receive processing
2808 */
2809 rcu_read_lock();
2810
2811 /*
2812 * Frames with failed FCS/PLCP checksum are not returned,
2813 * all other frames are returned without radiotap header
2814 * if it was previously present.
2815 * Also, frames with less than 16 bytes are dropped.
2816 */
f1d58c25 2817 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2818 if (!skb) {
2819 rcu_read_unlock();
2820 return;
2821 }
2822
071d9ac2 2823 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2824
2825 rcu_read_unlock();
77a980dc
JB		 2826
2827 return;
2828 drop:
2829 kfree_skb(skb);
6368e4b1 2830}
103bf9f7 2831EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2832
2833/* This is a version of the rx handler that can be called from hard irq
2834 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2835void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2836{
2837 struct ieee80211_local *local = hw_to_local(hw);
2838
2839 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2840
571ecf67
JB		 2841 skb->pkt_type = IEEE80211_RX_MSG;
2842 skb_queue_tail(&local->skb_queue, skb);
2843 tasklet_schedule(&local->tasklet);
2844}
2845EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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