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Merge branch 'wl12xx-next' of git://git.kernel.org/pub/scm/linux/kernel/git/luca...
[mirror_ubuntu-bionic-kernel.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;
554891e6 318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 319 int tid;
320
321 /* does the frame have a qos control field? */
238f74a2
HH		 322 if (ieee80211_is_data_qos(hdr->frame_control)) {
323 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 324 /* frame has qos control */
238f74a2
HH		 325 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
326 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 327 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 328 } else {
1411f9b5
JB		 329 /*
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
331 *
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
337 *
338 * We also use that counter for non-QoS STAs.
339 */
340 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 341 }
52865dfd 342
5cf121c3 343 rx->queue = tid;
6e0d114d
JB		 344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 347}
6e0d114d 348
d1c3a37c
JB		 349/**
350 * DOC: Packet alignment
351 *
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
353 * to the stack.
354 *
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
d1c3a37c
JB		 363 *
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
369 *
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
373 */
374static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 375{
59d9cb07
KV		 376#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx->skb->data & 1,
378 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 379#endif
6e0d114d
JB		 380}
381
6368e4b1 382
571ecf67
JB		 383/* rx handlers */
384
49461622 385static ieee80211_rx_result debug_noinline
5cf121c3 386ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 387{
388 struct ieee80211_local *local = rx->local;
554891e6 389 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 390 struct sk_buff *skb = rx->skb;
391
554891e6 392 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 393 return RX_CONTINUE;
394
395 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
f1d58c25 396 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 397
4080c7cd 398 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
ece8eddd 399 /* drop all the other packets during a software scan anyway */
f1d58c25 400 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 401 dev_kfree_skb(skb);
9ae54c84 402 return RX_QUEUED;
571ecf67
JB		 403 }
404
4080c7cd
JB		 405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
407 return RX_DROP_UNUSABLE;
571ecf67
JB		 408}
409
3cfcf6ac
JM		 410
411static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
412{
413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
414
415 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
416 return 0;
417
418 return ieee80211_is_robust_mgmt_frame(hdr);
419}
420
421
422static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
423{
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
425
426 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
427 return 0;
428
429 return ieee80211_is_robust_mgmt_frame(hdr);
430}
431
432
433/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
435{
436 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
437 struct ieee80211_mmie *mmie;
438
439 if (skb->len < 24 + sizeof(*mmie) ||
440 !is_multicast_ether_addr(hdr->da))
441 return -1;
442
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
444 return -1; /* not a robust management frame */
445
446 mmie = (struct ieee80211_mmie *)
447 (skb->data + skb->len - sizeof(*mmie));
448 if (mmie->element_id != WLAN_EID_MMIE ||
449 mmie->length != sizeof(*mmie) - 2)
450 return -1;
451
452 return le16_to_cpu(mmie->key_id);
453}
454
455
33b64eb2 456static ieee80211_rx_result
5cf121c3 457ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 458{
a7767f95
HH		 459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
460 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 461 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 462
a7767f95 463 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 464 if (is_multicast_ether_addr(hdr->addr1)) {
465 if (ieee80211_has_tods(hdr->frame_control) ||
466 !ieee80211_has_fromds(hdr->frame_control))
467 return RX_DROP_MONITOR;
468 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
469 return RX_DROP_MONITOR;
470 } else {
471 if (!ieee80211_has_a4(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
475 }
33b64eb2
LCC		 476 }
477
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
480 */
481
b4e08ea1 482 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 483 struct ieee80211_mgmt *mgmt;
d6d1a5a7 484
a7767f95 485 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 486 return RX_DROP_MONITOR;
487
a7767f95 488 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 489 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 490 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 491 return RX_DROP_MONITOR;
33b64eb2 492 return RX_CONTINUE;
33b64eb2
LCC		 493 }
494
a7767f95
HH		 495 if (ieee80211_is_probe_req(hdr->frame_control) ||
496 ieee80211_is_probe_resp(hdr->frame_control) ||
497 ieee80211_is_beacon(hdr->frame_control))
498 return RX_CONTINUE;
499
500 return RX_DROP_MONITOR;
501
502 }
503
504#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
505
506 if (ieee80211_is_data(hdr->frame_control) &&
507 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 508 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 509 return RX_DROP_MONITOR;
902acc78 510#undef msh_h_get
d6d1a5a7 511
902acc78
JB		 512 return RX_CONTINUE;
513}
33b64eb2 514
1edfb1af
JB		 515#define SEQ_MODULO 0x1000
516#define SEQ_MASK 0xfff
517
518static inline int seq_less(u16 sq1, u16 sq2)
519{
520 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
521}
522
523static inline u16 seq_inc(u16 sq)
524{
525 return (sq + 1) & SEQ_MASK;
526}
527
528static inline u16 seq_sub(u16 sq1, u16 sq2)
529{
530 return (sq1 - sq2) & SEQ_MASK;
531}
532
533
534static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
535 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 536 int index,
537 struct sk_buff_head *frames)
1edfb1af 538{
1edfb1af 539 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
1edfb1af 540
dd318575
JB		 541 lockdep_assert_held(&tid_agg_rx->reorder_lock);
542
1edfb1af
JB		 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
dd318575
JB		 562 lockdep_assert_held(&tid_agg_rx->reorder_lock);
563
1edfb1af
JB		 564 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
565 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
566 tid_agg_rx->buf_size;
2569a826 567 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
1edfb1af
JB		 568 }
569}
570
571/*
572 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
573 * the skb was added to the buffer longer than this time ago, the earlier
574 * frames that have not yet been received are assumed to be lost and the skb
575 * can be released for processing. This may also release other skb's from the
576 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 577 *
578 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 579 */
580#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
581
aa0c8636
CL		 582static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
583 struct tid_ampdu_rx *tid_agg_rx,
584 struct sk_buff_head *frames)
585{
2bff8ebf 586 int index, j;
aa0c8636 587
dd318575
JB		 588 lockdep_assert_held(&tid_agg_rx->reorder_lock);
589
aa0c8636
CL		 590 /* release the buffer until next missing frame */
591 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
592 tid_agg_rx->buf_size;
593 if (!tid_agg_rx->reorder_buf[index] &&
594 tid_agg_rx->stored_mpdu_num > 1) {
595 /*
596 * No buffers ready to be released, but check whether any
597 * frames in the reorder buffer have timed out.
598 */
aa0c8636
CL		 599 int skipped = 1;
600 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
601 j = (j + 1) % tid_agg_rx->buf_size) {
602 if (!tid_agg_rx->reorder_buf[j]) {
603 skipped++;
604 continue;
605 }
606 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
607 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 608 goto set_release_timer;
aa0c8636
CL		 609
610#ifdef CONFIG_MAC80211_HT_DEBUG
611 if (net_ratelimit())
0fb9a9ec
JP		 612 wiphy_debug(hw->wiphy,
613 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636
CL		 614#endif
615 ieee80211_release_reorder_frame(hw, tid_agg_rx,
616 j, frames);
617
618 /*
619 * Increment the head seq# also for the skipped slots.
620 */
621 tid_agg_rx->head_seq_num =
622 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
623 skipped = 0;
624 }
625 } else while (tid_agg_rx->reorder_buf[index]) {
626 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
627 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
628 tid_agg_rx->buf_size;
629 }
2bff8ebf 630
15943a72
CL		 631 /*
632 * Disable the reorder release timer for now.
633 *
634 * The current implementation lacks a proper locking scheme
635 * which would protect vital statistic and debug counters
636 * from being updated by two different but concurrent BHs.
637 *
638 * More information about the topic is available from:
639 * - thread: http://marc.info/?t=128635927000001
640 *
641 * What was wrong:
642 * => http://marc.info/?l=linux-wireless&m=128636170811964
643 * "Basically the thing is that until your patch, the data
644 * in the struct didn't actually need locking because it
645 * was accessed by the RX path only which is not concurrent."
646 *
647 * List of what needs to be fixed:
648 * => http://marc.info/?l=linux-wireless&m=128656352920957
649 *
650
2bff8ebf
CL		 651 if (tid_agg_rx->stored_mpdu_num) {
652 j = index = seq_sub(tid_agg_rx->head_seq_num,
653 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
654
655 for (; j != (index - 1) % tid_agg_rx->buf_size;
656 j = (j + 1) % tid_agg_rx->buf_size) {
657 if (tid_agg_rx->reorder_buf[j])
658 break;
659 }
660
661 set_release_timer:
662
663 mod_timer(&tid_agg_rx->reorder_timer,
664 tid_agg_rx->reorder_time[j] +
665 HT_RX_REORDER_BUF_TIMEOUT);
666 } else {
667 del_timer(&tid_agg_rx->reorder_timer);
668 }
15943a72
CL		 669 */
670
671set_release_timer:
672 return;
aa0c8636
CL		 673}
674
1edfb1af
JB		 675/*
676 * As this function belongs to the RX path it must be under
677 * rcu_read_lock protection. It returns false if the frame
678 * can be processed immediately, true if it was consumed.
679 */
680static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
681 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 682 struct sk_buff *skb,
683 struct sk_buff_head *frames)
1edfb1af
JB		 684{
685 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
686 u16 sc = le16_to_cpu(hdr->seq_ctrl);
687 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
688 u16 head_seq_num, buf_size;
689 int index;
2bff8ebf 690 bool ret = true;
1edfb1af 691
dd318575
JB		 692 spin_lock(&tid_agg_rx->reorder_lock);
693
1edfb1af
JB		 694 buf_size = tid_agg_rx->buf_size;
695 head_seq_num = tid_agg_rx->head_seq_num;
696
697 /* frame with out of date sequence number */
698 if (seq_less(mpdu_seq_num, head_seq_num)) {
699 dev_kfree_skb(skb);
2bff8ebf 700 goto out;
1edfb1af
JB		 701 }
702
703 /*
704 * If frame the sequence number exceeds our buffering window
705 * size release some previous frames to make room for this one.
706 */
707 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
708 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
709 /* release stored frames up to new head to stack */
2569a826
JB		 710 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
711 frames);
1edfb1af
JB		 712 }
713
714 /* Now the new frame is always in the range of the reordering buffer */
715
716 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
717
718 /* check if we already stored this frame */
719 if (tid_agg_rx->reorder_buf[index]) {
720 dev_kfree_skb(skb);
2bff8ebf 721 goto out;
1edfb1af
JB		 722 }
723
724 /*
725 * If the current MPDU is in the right order and nothing else
726 * is stored we can process it directly, no need to buffer it.
727 */
728 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
729 tid_agg_rx->stored_mpdu_num == 0) {
730 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 731 ret = false;
732 goto out;
1edfb1af
JB		 733 }
734
735 /* put the frame in the reordering buffer */
736 tid_agg_rx->reorder_buf[index] = skb;
737 tid_agg_rx->reorder_time[index] = jiffies;
738 tid_agg_rx->stored_mpdu_num++;
aa0c8636 739 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
1edfb1af 740
2bff8ebf
CL		 741 out:
742 spin_unlock(&tid_agg_rx->reorder_lock);
743 return ret;
1edfb1af
JB		 744}
745
746/*
747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
748 * true if the MPDU was buffered, false if it should be processed.
749 */
2569a826
JB		 750static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
751 struct sk_buff_head *frames)
1edfb1af 752{
2569a826
JB		 753 struct sk_buff *skb = rx->skb;
754 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 755 struct ieee80211_hw *hw = &local->hw;
756 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 757 struct sta_info *sta = rx->sta;
1edfb1af
JB		 758 struct tid_ampdu_rx *tid_agg_rx;
759 u16 sc;
760 int tid;
761
762 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 763 goto dont_reorder;
1edfb1af
JB		 764
765 /*
766 * filter the QoS data rx stream according to
767 * STA/TID and check if this STA/TID is on aggregation
768 */
769
1edfb1af 770 if (!sta)
2569a826 771 goto dont_reorder;
1edfb1af
JB		 772
773 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
774
a87f736d
JB		 775 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
776 if (!tid_agg_rx)
777 goto dont_reorder;
1edfb1af
JB		 778
779 /* qos null data frames are excluded */
780 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 781 goto dont_reorder;
1edfb1af
JB		 782
783 /* new, potentially un-ordered, ampdu frame - process it */
784
785 /* reset session timer */
786 if (tid_agg_rx->timeout)
787 mod_timer(&tid_agg_rx->session_timer,
788 TU_TO_EXP_TIME(tid_agg_rx->timeout));
789
790 /* if this mpdu is fragmented - terminate rx aggregation session */
791 sc = le16_to_cpu(hdr->seq_ctrl);
792 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 793 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 794 skb_queue_tail(&rx->sdata->skb_queue, skb);
795 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 796 return;
1edfb1af
JB		 797 }
798
a87f736d
JB		 799 /*
800 * No locking needed -- we will only ever process one
801 * RX packet at a time, and thus own tid_agg_rx. All
802 * other code manipulating it needs to (and does) make
803 * sure that we cannot get to it any more before doing
804 * anything with it.
805 */
806 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
2569a826
JB		 807 return;
808
809 dont_reorder:
810 __skb_queue_tail(frames, skb);
1edfb1af 811}
33b64eb2 812
49461622 813static ieee80211_rx_result debug_noinline
5cf121c3 814ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 815{
a7767f95 816 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 817 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 818
819 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
820 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 821 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 822 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 823 hdr->seq_ctrl)) {
554891e6 824 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 825 rx->local->dot11FrameDuplicateCount++;
826 rx->sta->num_duplicates++;
827 }
e4c26add 828 return RX_DROP_MONITOR;
571ecf67 829 } else
5cf121c3 830 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 831 }
832
571ecf67
JB		 833 if (unlikely(rx->skb->len < 16)) {
834 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 835 return RX_DROP_MONITOR;
571ecf67
JB		 836 }
837
571ecf67
JB		 838 /* Drop disallowed frame classes based on STA auth/assoc state;
839 * IEEE 802.11, Chap 5.5.
840 *
ccd7b362
JB		 841 * mac80211 filters only based on association state, i.e. it drops
842 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 843 * deauth/disassoc frames when needed. In addition, hostapd is
844 * responsible for filtering on both auth and assoc states.
845 */
33b64eb2 846
902acc78 847 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 848 return ieee80211_rx_mesh_check(rx);
33b64eb2 849
a7767f95
HH		 850 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
851 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 852 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 853 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
07346f81 854 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 855 if ((!ieee80211_has_fromds(hdr->frame_control) &&
856 !ieee80211_has_tods(hdr->frame_control) &&
857 ieee80211_is_data(hdr->frame_control)) ||
554891e6 858 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 859 /* Drop IBSS frames and frames for other hosts
860 * silently. */
e4c26add 861 return RX_DROP_MONITOR;
571ecf67
JB		 862 }
863
e4c26add 864 return RX_DROP_MONITOR;
571ecf67
JB		 865 }
866
9ae54c84 867 return RX_CONTINUE;
570bd537
JB		 868}
869
870
49461622 871static ieee80211_rx_result debug_noinline
5cf121c3 872ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 873{
eb9fb5b8
JB		 874 struct sk_buff *skb = rx->skb;
875 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
876 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 877 int keyidx;
878 int hdrlen;
e4c26add 879 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 880 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 881 int mmie_keyidx = -1;
761ab470 882 __le16 fc;
570bd537 883
3017b80b
JB		 884 /*
885 * Key selection 101
886 *
3cfcf6ac 887 * There are four types of keys:
3017b80b 888 * - GTK (group keys)
3cfcf6ac 889 * - IGTK (group keys for management frames)
3017b80b
JB		 890 * - PTK (pairwise keys)
891 * - STK (station-to-station pairwise keys)
892 *
893 * When selecting a key, we have to distinguish between multicast
894 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 895 * use PTKs and STKs while the former always use GTKs and IGTKs.
896 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
897 * unicast frames can also use key indices like GTKs. Hence, if we
898 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 899 *
8dc06a1c
JB		 900 * Note that in a regular BSS, multicast frames are sent by the
901 * AP only, associated stations unicast the frame to the AP first
902 * which then multicasts it on their behalf.
903 *
3017b80b
JB		 904 * There is also a slight problem in IBSS mode: GTKs are negotiated
905 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 906 * The spec seems to expect that one negotiates the same key with
907 * every station but there's no such requirement; VLANs could be
908 * possible.
3017b80b
JB		 909 */
910
3017b80b 911 /*
1990af8d 912 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 913 * addressed to us nor a multicast frame.
914 */
554891e6 915 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 916 return RX_CONTINUE;
3017b80b 917
2569a826
JB		 918 /* start without a key */
919 rx->key = NULL;
920
d4e46a3d 921 if (rx->sta)
e31b8213 922 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 923
761ab470
JB		 924 fc = hdr->frame_control;
925
926 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 927 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
928
e31b8213
JB		 929 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
930 rx->key = sta_ptk;
dc1580dd
JB		 931 if ((status->flag & RX_FLAG_DECRYPTED) &&
932 (status->flag & RX_FLAG_IV_STRIPPED))
933 return RX_CONTINUE;
0c7c10c7 934 /* Skip decryption if the frame is not protected. */
761ab470 935 if (!ieee80211_has_protected(fc))
0c7c10c7 936 return RX_CONTINUE;
3cfcf6ac
JM		 937 } else if (mmie_keyidx >= 0) {
938 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 939 if ((status->flag & RX_FLAG_DECRYPTED) &&
940 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 941 return RX_CONTINUE;
942
943 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
944 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
945 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 946 if (rx->sta)
947 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
948 if (!rx->key)
949 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 950 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 951 /*
952 * The frame was not protected, so skip decryption. However, we
953 * need to set rx->key if there is a key that could have been
954 * used so that the frame may be dropped if encryption would
955 * have been expected.
956 */
957 struct ieee80211_key *key = NULL;
897bed8b
JB		 958 struct ieee80211_sub_if_data *sdata = rx->sdata;
959 int i;
960
761ab470 961 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 962 is_multicast_ether_addr(hdr->addr1) &&
963 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
964 rx->key = key;
897bed8b
JB		 965 else {
966 if (rx->sta) {
967 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
968 key = rcu_dereference(rx->sta->gtk[i]);
969 if (key)
970 break;
971 }
972 }
973 if (!key) {
974 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
975 key = rcu_dereference(sdata->keys[i]);
976 if (key)
977 break;
978 }
979 }
980 if (key)
981 rx->key = key;
982 }
0c7c10c7 983 return RX_CONTINUE;
571ecf67 984 } else {
39184b15 985 u8 keyid;
3017b80b
JB		 986 /*
987 * The device doesn't give us the IV so we won't be
988 * able to look up the key. That's ok though, we
989 * don't need to decrypt the frame, we just won't
990 * be able to keep statistics accurate.
991 * Except for key threshold notifications, should
992 * we somehow allow the driver to tell us which key
993 * the hardware used if this flag is set?
994 */
eb9fb5b8
JB		 995 if ((status->flag & RX_FLAG_DECRYPTED) &&
996 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 997 return RX_CONTINUE;
3017b80b 998
761ab470 999 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1000
1001 if (rx->skb->len < 8 + hdrlen)
e4c26add 1002 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1003
1004 /*
1005 * no need to call ieee80211_wep_get_keyidx,
1006 * it verifies a bunch of things we've done already
1007 */
39184b15
ZY		 1008 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1009 keyidx = keyid >> 6;
3017b80b 1010
e31b8213
JB		 1011 /* check per-station GTK first, if multicast packet */
1012 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1013 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1014
e31b8213
JB		 1015 /* if not found, try default key */
1016 if (!rx->key) {
1017 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1018
1019 /*
1020 * RSNA-protected unicast frames should always be
1021 * sent with pairwise or station-to-station keys,
1022 * but for WEP we allow using a key index as well.
1023 */
1024 if (rx->key &&
1025 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1026 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1027 !is_multicast_ether_addr(hdr->addr1))
1028 rx->key = NULL;
1029 }
571ecf67
JB		 1030 }
1031
3017b80b 1032 if (rx->key) {
571ecf67 1033 rx->key->tx_rx_count++;
011bfcc4 1034 /* TODO: add threshold stuff again */
1990af8d 1035 } else {
e4c26add 1036 return RX_DROP_MONITOR;
70f08765
JB		 1037 }
1038
39184b15
ZY		 1039 if (skb_linearize(rx->skb))
1040 return RX_DROP_UNUSABLE;
761ab470 1041 /* the hdr variable is invalid now! */
1990af8d 1042
97359d12
JB		 1043 switch (rx->key->conf.cipher) {
1044 case WLAN_CIPHER_SUITE_WEP40:
1045 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1046 /* Check for weak IVs if possible */
1047 if (rx->sta && ieee80211_is_data(fc) &&
1048 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1049 !(status->flag & RX_FLAG_DECRYPTED)) &&
1050 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1051 rx->sta->wep_weak_iv_count++;
1052
e2f036da
MN		 1053 result = ieee80211_crypto_wep_decrypt(rx);
1054 break;
97359d12 1055 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1056 result = ieee80211_crypto_tkip_decrypt(rx);
1057 break;
97359d12 1058 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1059 result = ieee80211_crypto_ccmp_decrypt(rx);
1060 break;
97359d12 1061 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1062 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1063 break;
3ffc2a90
JB		 1064 default:
1065 /*
1066 * We can reach here only with HW-only algorithms
1067 * but why didn't it decrypt the frame?!
1068 */
1069 return RX_DROP_UNUSABLE;
70f08765
JB		 1070 }
1071
e2f036da 1072 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1073 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1074
1075 return result;
70f08765
JB		 1076}
1077
572e0012
KV		 1078static ieee80211_rx_result debug_noinline
1079ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1080{
1081 struct ieee80211_local *local;
1082 struct ieee80211_hdr *hdr;
1083 struct sk_buff *skb;
1084
1085 local = rx->local;
1086 skb = rx->skb;
1087 hdr = (struct ieee80211_hdr *) skb->data;
1088
1089 if (!local->pspolling)
1090 return RX_CONTINUE;
1091
1092 if (!ieee80211_has_fromds(hdr->frame_control))
1093 /* this is not from AP */
1094 return RX_CONTINUE;
1095
1096 if (!ieee80211_is_data(hdr->frame_control))
1097 return RX_CONTINUE;
1098
1099 if (!ieee80211_has_moredata(hdr->frame_control)) {
1100 /* AP has no more frames buffered for us */
1101 local->pspolling = false;
1102 return RX_CONTINUE;
1103 }
1104
1105 /* more data bit is set, let's request a new frame from the AP */
1106 ieee80211_send_pspoll(local, rx->sdata);
1107
1108 return RX_CONTINUE;
1109}
1110
133b8226 1111static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1112{
133b8226 1113 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1114 struct ieee80211_local *local = sdata->local;
0795af57 1115
3e122be0 1116 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1117 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1118 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1119#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1120 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1121 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1122#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1123}
1124
ff9458d3 1125static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1126{
133b8226 1127 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1128
3e122be0 1129 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1130
571ecf67 1131#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1132 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1133 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1134#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1135
af818581 1136 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1137#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1138 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1139 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1140#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1141 return;
1142 }
1143
1144 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1145}
1146
49461622 1147static ieee80211_rx_result debug_noinline
5cf121c3 1148ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1149{
1150 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1151 struct sk_buff *skb = rx->skb;
1152 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1153 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1154
1155 if (!sta)
9ae54c84 1156 return RX_CONTINUE;
571ecf67 1157
b291ba11
JB		 1158 /*
1159 * Update last_rx only for IBSS packets which are for the current
1160 * BSSID to avoid keeping the current IBSS network alive in cases
1161 * where other STAs start using different BSSID.
1162 */
05c914fe 1163 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1164 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1165 NL80211_IFTYPE_ADHOC);
46900298 1166 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1167 sta->last_rx = jiffies;
b291ba11
JB		 1168 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1169 /*
33b64eb2
LCC		 1170 * Mesh beacons will update last_rx when if they are found to
1171 * match the current local configuration when processed.
571ecf67 1172 */
b291ba11 1173 sta->last_rx = jiffies;
571ecf67
JB		 1174 }
1175
554891e6 1176 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1177 return RX_CONTINUE;
571ecf67 1178
3cf335d5
KV		 1179 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1180 ieee80211_sta_rx_notify(rx->sdata, hdr);
1181
571ecf67
JB		 1182 sta->rx_fragments++;
1183 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1184 sta->last_signal = status->signal;
541a45a1 1185 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1186
72eaa43a
JB		 1187 /*
1188 * Change STA power saving mode only at the end of a frame
1189 * exchange sequence.
1190 */
3e122be0 1191 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 1192 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1193 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1194 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1195 /*
1196 * Ignore doze->wake transitions that are
1197 * indicated by non-data frames, the standard
1198 * is unclear here, but for example going to
1199 * PS mode and then scanning would cause a
1200 * doze->wake transition for the probe request,
1201 * and that is clearly undesirable.
1202 */
1203 if (ieee80211_is_data(hdr->frame_control) &&
1204 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1205 ap_sta_ps_end(sta);
72eaa43a
JB		 1206 } else {
1207 if (ieee80211_has_pm(hdr->frame_control))
1208 ap_sta_ps_start(sta);
1209 }
571ecf67
JB		 1210 }
1211
22403def
JB		 1212 /*
1213 * Drop (qos-)data::nullfunc frames silently, since they
1214 * are used only to control station power saving mode.
1215 */
1216 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1217 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1218 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1219
1220 /*
1221 * If we receive a 4-addr nullfunc frame from a STA
1222 * that was not moved to a 4-addr STA vlan yet, drop
1223 * the frame to the monitor interface, to make sure
1224 * that hostapd sees it
1225 */
1226 if (ieee80211_has_a4(hdr->frame_control) &&
1227 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1228 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1229 !rx->sdata->u.vlan.sta)))
1230 return RX_DROP_MONITOR;
22403def
JB		 1231 /*
1232 * Update counter and free packet here to avoid
1233 * counting this as a dropped packed.
1234 */
571ecf67
JB		 1235 sta->rx_packets++;
1236 dev_kfree_skb(rx->skb);
9ae54c84 1237 return RX_QUEUED;
571ecf67
JB		 1238 }
1239
9ae54c84 1240 return RX_CONTINUE;
571ecf67
JB		 1241} /* ieee80211_rx_h_sta_process */
1242
571ecf67
JB		 1243static inline struct ieee80211_fragment_entry *
1244ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1245 unsigned int frag, unsigned int seq, int rx_queue,
1246 struct sk_buff **skb)
1247{
1248 struct ieee80211_fragment_entry *entry;
1249 int idx;
1250
1251 idx = sdata->fragment_next;
1252 entry = &sdata->fragments[sdata->fragment_next++];
1253 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1254 sdata->fragment_next = 0;
1255
1256 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1257#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1258 struct ieee80211_hdr *hdr =
1259 (struct ieee80211_hdr *) entry->skb_list.next->data;
1260 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1261 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1262 "addr1=%pM addr2=%pM\n",
47846c9b 1263 sdata->name, idx,
571ecf67 1264 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1265 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1266#endif
571ecf67
JB		 1267 __skb_queue_purge(&entry->skb_list);
1268 }
1269
1270 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1271 *skb = NULL;
1272 entry->first_frag_time = jiffies;
1273 entry->seq = seq;
1274 entry->rx_queue = rx_queue;
1275 entry->last_frag = frag;
1276 entry->ccmp = 0;
1277 entry->extra_len = 0;
1278
1279 return entry;
1280}
1281
1282static inline struct ieee80211_fragment_entry *
1283ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1284 unsigned int frag, unsigned int seq,
571ecf67
JB		 1285 int rx_queue, struct ieee80211_hdr *hdr)
1286{
1287 struct ieee80211_fragment_entry *entry;
1288 int i, idx;
1289
1290 idx = sdata->fragment_next;
1291 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1292 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1293
1294 idx--;
1295 if (idx < 0)
1296 idx = IEEE80211_FRAGMENT_MAX - 1;
1297
1298 entry = &sdata->fragments[idx];
1299 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1300 entry->rx_queue != rx_queue ||
1301 entry->last_frag + 1 != frag)
1302 continue;
1303
b73d70ad 1304 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1305
b73d70ad
HH		 1306 /*
1307 * Check ftype and addresses are equal, else check next fragment
1308 */
1309 if (((hdr->frame_control ^ f_hdr->frame_control) &
1310 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1311 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1312 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1313 continue;
1314
ab46623e 1315 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1316 __skb_queue_purge(&entry->skb_list);
1317 continue;
1318 }
1319 return entry;
1320 }
1321
1322 return NULL;
1323}
1324
49461622 1325static ieee80211_rx_result debug_noinline
5cf121c3 1326ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1327{
1328 struct ieee80211_hdr *hdr;
1329 u16 sc;
358c8d9d 1330 __le16 fc;
571ecf67
JB		 1331 unsigned int frag, seq;
1332 struct ieee80211_fragment_entry *entry;
1333 struct sk_buff *skb;
554891e6 1334 struct ieee80211_rx_status *status;
571ecf67 1335
b73d70ad 1336 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1337 fc = hdr->frame_control;
571ecf67
JB		 1338 sc = le16_to_cpu(hdr->seq_ctrl);
1339 frag = sc & IEEE80211_SCTL_FRAG;
1340
358c8d9d 1341 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1342 (rx->skb)->len < 24 ||
1343 is_multicast_ether_addr(hdr->addr1))) {
1344 /* not fragmented */
1345 goto out;
1346 }
1347 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1348
e3cf8b3f
ZY		 1349 if (skb_linearize(rx->skb))
1350 return RX_DROP_UNUSABLE;
1351
058897a4
AK		 1352 /*
1353 * skb_linearize() might change the skb->data and
1354 * previously cached variables (in this case, hdr) need to
1355 * be refreshed with the new data.
1356 */
1357 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1358 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1359
1360 if (frag == 0) {
1361 /* This is the first fragment of a new frame. */
1362 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1363 rx->queue, &(rx->skb));
97359d12 1364 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1365 ieee80211_has_protected(fc)) {
9190252c
JM		 1366 int queue = ieee80211_is_mgmt(fc) ?
1367 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1368 /* Store CCMP PN so that we can verify that the next
1369 * fragment has a sequential PN value. */
1370 entry->ccmp = 1;
1371 memcpy(entry->last_pn,
9190252c 1372 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1373 CCMP_PN_LEN);
1374 }
9ae54c84 1375 return RX_QUEUED;
571ecf67
JB		 1376 }
1377
1378 /* This is a fragment for a frame that should already be pending in
1379 * fragment cache. Add this fragment to the end of the pending entry.
1380 */
b73d70ad 1381 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1382 if (!entry) {
1383 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1384 return RX_DROP_MONITOR;
571ecf67
JB		 1385 }
1386
1387 /* Verify that MPDUs within one MSDU have sequential PN values.
1388 * (IEEE 802.11i, 8.3.3.4.5) */
1389 if (entry->ccmp) {
1390 int i;
1391 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1392 int queue;
97359d12 1393 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1394 return RX_DROP_UNUSABLE;
571ecf67
JB		 1395 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1396 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1397 pn[i]++;
1398 if (pn[i])
1399 break;
1400 }
9190252c
JM		 1401 queue = ieee80211_is_mgmt(fc) ?
1402 NUM_RX_DATA_QUEUES : rx->queue;
1403 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1404 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1405 return RX_DROP_UNUSABLE;
571ecf67
JB		 1406 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1407 }
1408
358c8d9d 1409 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1410 __skb_queue_tail(&entry->skb_list, rx->skb);
1411 entry->last_frag = frag;
1412 entry->extra_len += rx->skb->len;
358c8d9d 1413 if (ieee80211_has_morefrags(fc)) {
571ecf67 1414 rx->skb = NULL;
9ae54c84 1415 return RX_QUEUED;
571ecf67
JB		 1416 }
1417
1418 rx->skb = __skb_dequeue(&entry->skb_list);
1419 if (skb_tailroom(rx->skb) < entry->extra_len) {
1420 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1421 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1422 GFP_ATOMIC))) {
1423 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1424 __skb_queue_purge(&entry->skb_list);
e4c26add 1425 return RX_DROP_UNUSABLE;
571ecf67
JB		 1426 }
1427 }
1428 while ((skb = __skb_dequeue(&entry->skb_list))) {
1429 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1430 dev_kfree_skb(skb);
1431 }
1432
1433 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1434 status = IEEE80211_SKB_RXCB(rx->skb);
1435 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1436
1437 out:
1438 if (rx->sta)
1439 rx->sta->rx_packets++;
1440 if (is_multicast_ether_addr(hdr->addr1))
1441 rx->local->dot11MulticastReceivedFrameCount++;
1442 else
1443 ieee80211_led_rx(rx->local);
9ae54c84 1444 return RX_CONTINUE;
571ecf67
JB		 1445}
1446
49461622 1447static ieee80211_rx_result debug_noinline
5cf121c3 1448ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1449{
af818581 1450 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1451 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1452 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1453
358c8d9d 1454 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1455 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1456 return RX_CONTINUE;
571ecf67 1457
05c914fe
JB		 1458 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1459 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1460 return RX_DROP_UNUSABLE;
98f0b0a3 1461
af818581
JB		 1462 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1463 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1464 else
1465 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1466
9ae54c84 1467 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1468 * count as an dropped frame. */
1469 dev_kfree_skb(rx->skb);
1470
9ae54c84 1471 return RX_QUEUED;
571ecf67
JB		 1472}
1473
49461622 1474static ieee80211_rx_result debug_noinline
5cf121c3 1475ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1476{
6e0d114d 1477 u8 *data = rx->skb->data;
238f74a2 1478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1479
238f74a2 1480 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1481 return RX_CONTINUE;
6e0d114d
JB		 1482
1483 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1484 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1485 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1486 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1487 /* change frame type to non QOS */
238f74a2 1488 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1489
9ae54c84 1490 return RX_CONTINUE;
6e0d114d
JB		 1491}
1492
76ee65bf 1493static int
5cf121c3 1494ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1495{
07346f81 1496 if (unlikely(!rx->sta ||
f4ea83dd 1497 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1498 return -EACCES;
571ecf67 1499
76ee65bf 1500 return 0;
571ecf67
JB		 1501}
1502
76ee65bf 1503static int
358c8d9d 1504ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1505{
eb9fb5b8
JB		 1506 struct sk_buff *skb = rx->skb;
1507 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1508
3017b80b 1509 /*
7848ba7d
JB		 1510 * Pass through unencrypted frames if the hardware has
1511 * decrypted them already.
3017b80b 1512 */
eb9fb5b8 1513 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1514 return 0;
571ecf67
JB		 1515
1516 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1517 if (unlikely(!ieee80211_has_protected(fc) &&
1518 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1519 ieee80211_is_data(fc) &&
b3fc9c6c 1520 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1521 return -EACCES;
bef5d1c7
JB		 1522
1523 return 0;
1524}
1525
1526static int
1527ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1528{
1529 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1530 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1531 __le16 fc = hdr->frame_control;
bef5d1c7 1532
e3efca0a
JM		 1533 /*
1534 * Pass through unencrypted frames if the hardware has
1535 * decrypted them already.
1536 */
1537 if (status->flag & RX_FLAG_DECRYPTED)
1538 return 0;
bef5d1c7 1539
f2ca3ea4 1540 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1541 if (unlikely(!ieee80211_has_protected(fc) &&
1542 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
f2ca3ea4
JM		 1543 rx->key))
1544 return -EACCES;
1545 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1546 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
fa83a218 1547 ieee80211_get_mmie_keyidx(rx->skb) < 0))
f2ca3ea4
JM		 1548 return -EACCES;
1549 /*
1550 * When using MFP, Action frames are not allowed prior to
1551 * having configured keys.
1552 */
1553 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1554 ieee80211_is_robust_mgmt_frame(
1555 (struct ieee80211_hdr *) rx->skb->data)))
1556 return -EACCES;
1557 }
b3fc9c6c 1558
76ee65bf 1559 return 0;
571ecf67
JB		 1560}
1561
76ee65bf 1562static int
e31a16d6 1563__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1564{
eb9fb5b8 1565 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee
FF		 1566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1567
9bc383de
JB		 1568 if (ieee80211_has_a4(hdr->frame_control) &&
1569 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1570 return -1;
9bc383de
JB		 1571
1572 if (is_multicast_ether_addr(hdr->addr1) &&
1573 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1574 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
f14543ee 1575 return -1;
571ecf67 1576
47846c9b 1577 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
76ee65bf 1578}
571ecf67 1579
ce3edf6d
JB		 1580/*
1581 * requires that rx->skb is a frame with ethernet header
1582 */
358c8d9d 1583static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1584{
c97c23e3 1585 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1586 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1587 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1588
1589 /*
1590 * Allow EAPOL frames to us/the PAE group address regardless
1591 * of whether the frame was encrypted or not.
1592 */
a621fa4d 1593 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1594 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1595 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1596 return true;
1597
1598 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1599 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1600 return false;
1601
1602 return true;
1603}
1604
1605/*
1606 * requires that rx->skb is a frame with ethernet header
1607 */
76ee65bf 1608static void
5cf121c3 1609ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1610{
eb9fb5b8
JB		 1611 struct ieee80211_sub_if_data *sdata = rx->sdata;
1612 struct net_device *dev = sdata->dev;
76ee65bf 1613 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1614 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1615 struct sta_info *dsta;
554891e6 1616 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1617
76ee65bf
RR		 1618 skb = rx->skb;
1619 xmit_skb = NULL;
571ecf67 1620
05c914fe
JB		 1621 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1622 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1623 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1624 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1625 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1626 if (is_multicast_ether_addr(ehdr->h_dest)) {
1627 /*
1628 * send multicast frames both to higher layers in
1629 * local net stack and back to the wireless medium
1630 */
76ee65bf
RR		 1631 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1632 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1633 printk(KERN_DEBUG "%s: failed to clone "
1634 "multicast frame\n", dev->name);
1635 } else {
abe60632
JB		 1636 dsta = sta_info_get(sdata, skb->data);
1637 if (dsta) {
ce3edf6d
JB		 1638 /*
1639 * The destination station is associated to
1640 * this AP (in this VLAN), so send the frame
1641 * directly to it and do not pass it to local
1642 * net stack.
571ecf67 1643 */
76ee65bf 1644 xmit_skb = skb;
571ecf67
JB		 1645 skb = NULL;
1646 }
571ecf67
JB		 1647 }
1648 }
1649
1650 if (skb) {
d1c3a37c
JB		 1651 int align __maybe_unused;
1652
59d9cb07 1653#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1654 /*
1655 * 'align' will only take the values 0 or 2 here
1656 * since all frames are required to be aligned
1657 * to 2-byte boundaries when being passed to
1658 * mac80211. That also explains the __skb_push()
1659 * below.
1660 */
dacb6f1d 1661 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1662 if (align) {
1663 if (WARN_ON(skb_headroom(skb) < 3)) {
1664 dev_kfree_skb(skb);
1665 skb = NULL;
1666 } else {
1667 u8 *data = skb->data;
8ce0b589
ZY		 1668 size_t len = skb_headlen(skb);
1669 skb->data -= align;
1670 memmove(skb->data, data, len);
1671 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1672 }
1673 }
1674#endif
1675
1676 if (skb) {
1677 /* deliver to local stack */
1678 skb->protocol = eth_type_trans(skb, dev);
1679 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1680 netif_receive_skb(skb);
d1c3a37c 1681 }
571ecf67
JB		 1682 }
1683
76ee65bf 1684 if (xmit_skb) {
571ecf67 1685 /* send to wireless media */
f831e909 1686 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1687 skb_reset_network_header(xmit_skb);
1688 skb_reset_mac_header(xmit_skb);
76ee65bf 1689 dev_queue_xmit(xmit_skb);
571ecf67 1690 }
76ee65bf
RR		 1691}
1692
49461622 1693static ieee80211_rx_result debug_noinline
5cf121c3 1694ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1695{
eb9fb5b8 1696 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1697 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1698 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1699 __le16 fc = hdr->frame_control;
eaf85ca7 1700 struct sk_buff_head frame_list;
554891e6 1701 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1702
358c8d9d 1703 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1704 return RX_CONTINUE;
fd4c7f2f 1705
358c8d9d 1706 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1707 return RX_DROP_MONITOR;
fd4c7f2f 1708
554891e6 1709 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1710 return RX_CONTINUE;
fd4c7f2f 1711
eaf85ca7
ZY		 1712 if (ieee80211_has_a4(hdr->frame_control) &&
1713 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1714 !rx->sdata->u.vlan.sta)
e4c26add 1715 return RX_DROP_UNUSABLE;
fd4c7f2f 1716
eaf85ca7
ZY		 1717 if (is_multicast_ether_addr(hdr->addr1) &&
1718 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1719 rx->sdata->u.vlan.sta) ||
1720 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1721 rx->sdata->u.mgd.use_4addr)))
e4c26add 1722 return RX_DROP_UNUSABLE;
fd4c7f2f 1723
eaf85ca7
ZY		 1724 skb->dev = dev;
1725 __skb_queue_head_init(&frame_list);
fd4c7f2f 1726
e3cf8b3f
ZY		 1727 if (skb_linearize(skb))
1728 return RX_DROP_UNUSABLE;
1729
eaf85ca7
ZY		 1730 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1731 rx->sdata->vif.type,
1732 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1733
eaf85ca7
ZY		 1734 while (!skb_queue_empty(&frame_list)) {
1735 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1736
358c8d9d 1737 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1738 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1739 continue;
1740 }
eaf85ca7
ZY		 1741 dev->stats.rx_packets++;
1742 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1743
1744 ieee80211_deliver_skb(rx);
1745 }
1746
9ae54c84 1747 return RX_QUEUED;
fd4c7f2f
RR		 1748}
1749
bf94e17b 1750#ifdef CONFIG_MAC80211_MESH
b0dee578 1751static ieee80211_rx_result
e32f85f7
LCC		 1752ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1753{
1754 struct ieee80211_hdr *hdr;
1755 struct ieee80211s_hdr *mesh_hdr;
1756 unsigned int hdrlen;
1757 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1758 struct ieee80211_local *local = rx->local;
eb9fb5b8 1759 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1760 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1761
1762 hdr = (struct ieee80211_hdr *) skb->data;
1763 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1764 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1765
1766 if (!ieee80211_is_data(hdr->frame_control))
1767 return RX_CONTINUE;
1768
1769 if (!mesh_hdr->ttl)
1770 /* illegal frame */
1771 return RX_DROP_MONITOR;
1772
43b7b314 1773 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1774 struct mesh_path *mppath;
43b7b314
JC		 1775 char *proxied_addr;
1776 char *mpp_addr;
1777
1778 if (is_multicast_ether_addr(hdr->addr1)) {
1779 mpp_addr = hdr->addr3;
1780 proxied_addr = mesh_hdr->eaddr1;
1781 } else {
1782 mpp_addr = hdr->addr4;
1783 proxied_addr = mesh_hdr->eaddr2;
1784 }
79617dee 1785
79617dee 1786 rcu_read_lock();
43b7b314 1787 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1788 if (!mppath) {
43b7b314 1789 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1790 } else {
1791 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1792 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1793 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1794 spin_unlock_bh(&mppath->state_lock);
1795 }
1796 rcu_read_unlock();
1797 }
1798
3c5772a5
JC		 1799 /* Frame has reached destination. Don't forward */
1800 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1801 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1802 return RX_CONTINUE;
1803
1804 mesh_hdr->ttl--;
1805
554891e6 1806 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1807 if (!mesh_hdr->ttl)
472dbc45 1808 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1809 dropped_frames_ttl);
1810 else {
1811 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1812 struct ieee80211_tx_info *info;
1813
e32f85f7
LCC		 1814 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1815
1816 if (!fwd_skb && net_ratelimit())
1817 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1818 sdata->name);
e32f85f7
LCC		 1819
1820 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1821 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1822 info = IEEE80211_SKB_CB(fwd_skb);
1823 memset(info, 0, sizeof(*info));
1824 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1825 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1826 skb_set_queue_mapping(skb,
1827 ieee80211_select_queue(rx->sdata, fwd_skb));
1828 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1829 if (is_multicast_ether_addr(fwd_hdr->addr1))
1830 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1831 fwded_mcast);
1832 else {
3c5772a5
JC		 1833 int err;
1834 /*
1835 * Save TA to addr1 to send TA a path error if a
1836 * suitable next hop is not found
1837 */
1838 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1839 ETH_ALEN);
3c5772a5 1840 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1841 /* Failed to immediately resolve next hop:
1842 * fwded frame was dropped or will be added
1843 * later to the pending skb queue. */
1844 if (err)
1845 return RX_DROP_MONITOR;
c8a61a7d
DW		 1846
1847 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1848 fwded_unicast);
249b405c
JC		 1849 }
1850 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1851 fwded_frames);
3b8d81e0 1852 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1853 }
1854 }
1855
3c5772a5 1856 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1857 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1858 return RX_CONTINUE;
1859 else
1860 return RX_DROP_MONITOR;
1861}
bf94e17b 1862#endif
e32f85f7 1863
49461622 1864static ieee80211_rx_result debug_noinline
5cf121c3 1865ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1866{
eb9fb5b8 1867 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1868 struct ieee80211_local *local = rx->local;
eb9fb5b8 1869 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1870 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1871 __le16 fc = hdr->frame_control;
ce3edf6d 1872 int err;
76ee65bf 1873
358c8d9d 1874 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1875 return RX_CONTINUE;
76ee65bf 1876
358c8d9d 1877 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1878 return RX_DROP_MONITOR;
76ee65bf 1879
f14543ee
FF		 1880 /*
1881 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1882 * that a 4-addr station can be detected and moved into a separate VLAN
1883 */
1884 if (ieee80211_has_a4(hdr->frame_control) &&
1885 sdata->vif.type == NL80211_IFTYPE_AP)
1886 return RX_DROP_MONITOR;
1887
e31a16d6 1888 err = __ieee80211_data_to_8023(rx);
76ee65bf 1889 if (unlikely(err))
e4c26add 1890 return RX_DROP_UNUSABLE;
76ee65bf 1891
358c8d9d 1892 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1893 return RX_DROP_MONITOR;
ce3edf6d 1894
76ee65bf
RR		 1895 rx->skb->dev = dev;
1896
1897 dev->stats.rx_packets++;
1898 dev->stats.rx_bytes += rx->skb->len;
1899
08ca944e
HS		 1900 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1901 !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) {
e15276a4
VN		 1902 mod_timer(&local->dynamic_ps_timer, jiffies +
1903 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1904 }
1905
76ee65bf 1906 ieee80211_deliver_skb(rx);
571ecf67 1907
9ae54c84 1908 return RX_QUEUED;
571ecf67
JB		 1909}
1910
49461622 1911static ieee80211_rx_result debug_noinline
2569a826 1912ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716
RR		 1913{
1914 struct ieee80211_local *local = rx->local;
1915 struct ieee80211_hw *hw = &local->hw;
1916 struct sk_buff *skb = rx->skb;
a7767f95 1917 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1918 struct tid_ampdu_rx *tid_agg_rx;
1919 u16 start_seq_num;
1920 u16 tid;
1921
a7767f95 1922 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1923 return RX_CONTINUE;
71364716 1924
a7767f95 1925 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1926 struct {
1927 __le16 control, start_seq_num;
1928 } __packed bar_data;
1929
71364716 1930 if (!rx->sta)
a02ae758 1931 return RX_DROP_MONITOR;
8ae5977f
JB		 1932
1933 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1934 &bar_data, sizeof(bar_data)))
1935 return RX_DROP_MONITOR;
1936
8ae5977f 1937 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1938
1939 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1940 if (!tid_agg_rx)
a02ae758 1941 return RX_DROP_MONITOR;
71364716 1942
8ae5977f 1943 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1944
1945 /* reset session timer */
20ad19d0
JB		 1946 if (tid_agg_rx->timeout)
1947 mod_timer(&tid_agg_rx->session_timer,
1948 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1949
dd318575 1950 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 1951 /* release stored frames up to start of BAR */
2569a826
JB		 1952 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1953 frames);
dd318575
JB		 1954 spin_unlock(&tid_agg_rx->reorder_lock);
1955
a02ae758
JB		 1956 kfree_skb(skb);
1957 return RX_QUEUED;
71364716
RR		 1958 }
1959
08daecae
JB		 1960 /*
1961 * After this point, we only want management frames,
1962 * so we can drop all remaining control frames to
1963 * cooked monitor interfaces.
1964 */
1965 return RX_DROP_MONITOR;
71364716
RR		 1966}
1967
f4f727a6
JM		 1968static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1969 struct ieee80211_mgmt *mgmt,
1970 size_t len)
fea14732
JM		 1971{
1972 struct ieee80211_local *local = sdata->local;
1973 struct sk_buff *skb;
1974 struct ieee80211_mgmt *resp;
1975
47846c9b 1976 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 1977 /* Not to own unicast address */
1978 return;
1979 }
1980
46900298
JB		 1981 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1982 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1983 /* Not from the current AP or not associated yet. */
fea14732
JM		 1984 return;
1985 }
1986
1987 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1988 /* Too short SA Query request frame */
1989 return;
1990 }
1991
1992 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1993 if (skb == NULL)
1994 return;
1995
1996 skb_reserve(skb, local->hw.extra_tx_headroom);
1997 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1998 memset(resp, 0, 24);
1999 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2000 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2001 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2002 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2003 IEEE80211_STYPE_ACTION);
2004 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2005 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2006 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2007 memcpy(resp->u.action.u.sa_query.trans_id,
2008 mgmt->u.action.u.sa_query.trans_id,
2009 WLAN_SA_QUERY_TR_ID_LEN);
2010
62ae67be 2011 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2012}
2013
2e161f78
JB		 2014static ieee80211_rx_result debug_noinline
2015ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2016{
2017 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2018 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2019
2020 /*
2021 * From here on, look only at management frames.
2022 * Data and control frames are already handled,
2023 * and unknown (reserved) frames are useless.
2024 */
2025 if (rx->skb->len < 24)
2026 return RX_DROP_MONITOR;
2027
2028 if (!ieee80211_is_mgmt(mgmt->frame_control))
2029 return RX_DROP_MONITOR;
2030
554891e6 2031 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2032 return RX_DROP_MONITOR;
2033
2034 if (ieee80211_drop_unencrypted_mgmt(rx))
2035 return RX_DROP_UNUSABLE;
2036
2037 return RX_CONTINUE;
2038}
2039
de1ede7a
JB		 2040static ieee80211_rx_result debug_noinline
2041ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2042{
2043 struct ieee80211_local *local = rx->local;
eb9fb5b8 2044 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2045 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2046 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2047 int len = rx->skb->len;
2048
2049 if (!ieee80211_is_action(mgmt->frame_control))
2050 return RX_CONTINUE;
2051
026331c4
JM		 2052 /* drop too small frames */
2053 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2054 return RX_DROP_UNUSABLE;
de1ede7a 2055
026331c4 2056 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2057 return RX_DROP_UNUSABLE;
de1ede7a 2058
554891e6 2059 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2060 return RX_DROP_UNUSABLE;
97ebe12a 2061
de1ede7a
JB		 2062 switch (mgmt->u.action.category) {
2063 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2064 /*
2065 * The aggregation code is not prepared to handle
2066 * anything but STA/AP due to the BSSID handling;
2067 * IBSS could work in the code but isn't supported
2068 * by drivers or the standard.
2069 */
2070 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2071 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2072 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2073 break;
8abd3f9b 2074
026331c4
JM		 2075 /* verify action_code is present */
2076 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2077 break;
2078
de1ede7a
JB		 2079 switch (mgmt->u.action.u.addba_req.action_code) {
2080 case WLAN_ACTION_ADDBA_REQ:
2081 if (len < (IEEE80211_MIN_ACTION_SIZE +
2082 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2083 goto invalid;
2084 break;
de1ede7a
JB		 2085 case WLAN_ACTION_ADDBA_RESP:
2086 if (len < (IEEE80211_MIN_ACTION_SIZE +
2087 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2088 goto invalid;
2089 break;
de1ede7a
JB		 2090 case WLAN_ACTION_DELBA:
2091 if (len < (IEEE80211_MIN_ACTION_SIZE +
2092 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2093 goto invalid;
2094 break;
2095 default:
2096 goto invalid;
de1ede7a 2097 }
bed7ee6e 2098
8b58ff83 2099 goto queue;
39192c0b
JB		 2100 case WLAN_CATEGORY_SPECTRUM_MGMT:
2101 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2102 break;
46900298
JB		 2103
2104 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2105 break;
46900298 2106
026331c4
JM		 2107 /* verify action_code is present */
2108 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2109 break;
2110
39192c0b
JB		 2111 switch (mgmt->u.action.u.measurement.action_code) {
2112 case WLAN_ACTION_SPCT_MSR_REQ:
2113 if (len < (IEEE80211_MIN_ACTION_SIZE +
2114 sizeof(mgmt->u.action.u.measurement)))
84040805 2115 break;
39192c0b 2116 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2117 goto handled;
c481ec97
S		 2118 case WLAN_ACTION_SPCT_CHL_SWITCH:
2119 if (len < (IEEE80211_MIN_ACTION_SIZE +
2120 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2121 break;
c481ec97 2122
cc32abd4 2123 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2124 break;
cc32abd4 2125
46900298 2126 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2127 break;
c481ec97 2128
8b58ff83 2129 goto queue;
39192c0b
JB		 2130 }
2131 break;
fea14732
JM		 2132 case WLAN_CATEGORY_SA_QUERY:
2133 if (len < (IEEE80211_MIN_ACTION_SIZE +
2134 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2135 break;
2136
fea14732
JM		 2137 switch (mgmt->u.action.u.sa_query.action) {
2138 case WLAN_ACTION_SA_QUERY_REQUEST:
2139 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2140 break;
fea14732 2141 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2142 goto handled;
fea14732
JM		 2143 }
2144 break;
97ad9139
JC		 2145 case WLAN_CATEGORY_MESH_PLINK:
2146 case WLAN_CATEGORY_MESH_PATH_SEL:
77a121c3
JB		 2147 if (!ieee80211_vif_is_mesh(&sdata->vif))
2148 break;
8b58ff83 2149 goto queue;
84040805 2150 }
026331c4 2151
2e161f78
JB		 2152 return RX_CONTINUE;
2153
bed7ee6e 2154 invalid:
554891e6 2155 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2156 /* will return in the next handlers */
2157 return RX_CONTINUE;
2158
2159 handled:
2160 if (rx->sta)
2161 rx->sta->rx_packets++;
2162 dev_kfree_skb(rx->skb);
2163 return RX_QUEUED;
2164
2165 queue:
2166 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2167 skb_queue_tail(&sdata->skb_queue, rx->skb);
2168 ieee80211_queue_work(&local->hw, &sdata->work);
2169 if (rx->sta)
2170 rx->sta->rx_packets++;
2171 return RX_QUEUED;
2172}
2173
2174static ieee80211_rx_result debug_noinline
2175ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2176{
554891e6 2177 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2178
2179 /* skip known-bad action frames and return them in the next handler */
554891e6 2180 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2181 return RX_CONTINUE;
d7907448 2182
026331c4
JM		 2183 /*
2184 * Getting here means the kernel doesn't know how to handle
2185 * it, but maybe userspace does ... include returned frames
2186 * so userspace can register for those to know whether ones
2187 * it transmitted were processed or returned.
2188 */
026331c4 2189
2e161f78
JB		 2190 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2191 rx->skb->data, rx->skb->len,
2192 GFP_ATOMIC)) {
2193 if (rx->sta)
2194 rx->sta->rx_packets++;
2195 dev_kfree_skb(rx->skb);
2196 return RX_QUEUED;
2197 }
2198
2199
2200 return RX_CONTINUE;
2201}
2202
2203static ieee80211_rx_result debug_noinline
2204ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2205{
2206 struct ieee80211_local *local = rx->local;
2207 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2208 struct sk_buff *nskb;
2209 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2210 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2211
2212 if (!ieee80211_is_action(mgmt->frame_control))
2213 return RX_CONTINUE;
2214
2215 /*
2216 * For AP mode, hostapd is responsible for handling any action
2217 * frames that we didn't handle, including returning unknown
2218 * ones. For all other modes we will return them to the sender,
2219 * setting the 0x80 bit in the action category, as required by
2220 * 802.11-2007 7.3.1.11.
2221 * Newer versions of hostapd shall also use the management frame
2222 * registration mechanisms, but older ones still use cooked
2223 * monitor interfaces so push all frames there.
2224 */
554891e6 2225 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2226 (sdata->vif.type == NL80211_IFTYPE_AP ||
2227 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2228 return RX_DROP_MONITOR;
026331c4 2229
84040805
JB		 2230 /* do not return rejected action frames */
2231 if (mgmt->u.action.category & 0x80)
2232 return RX_DROP_UNUSABLE;
2233
2234 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2235 GFP_ATOMIC);
2236 if (nskb) {
292b4df6 2237 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2238
292b4df6
JL		 2239 nmgmt->u.action.category |= 0x80;
2240 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2241 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2242
2243 memset(nskb->cb, 0, sizeof(nskb->cb));
2244
2245 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2246 }
39192c0b
JB		 2247 dev_kfree_skb(rx->skb);
2248 return RX_QUEUED;
de1ede7a
JB		 2249}
2250
49461622 2251static ieee80211_rx_result debug_noinline
5cf121c3 2252ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2253{
eb9fb5b8 2254 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2255 ieee80211_rx_result rxs;
77a121c3
JB		 2256 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2257 __le16 stype;
571ecf67 2258
af6b6374
JB		 2259 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2260 if (rxs != RX_CONTINUE)
2261 return rxs;
2262
77a121c3 2263 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2264
77a121c3
JB		 2265 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2266 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2267 sdata->vif.type != NL80211_IFTYPE_STATION)
2268 return RX_DROP_MONITOR;
472dbc45 2269
77a121c3
JB		 2270 switch (stype) {
2271 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2272 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2273 /* process for all: mesh, mlme, ibss */
2274 break;
2275 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2276 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2277 if (is_multicast_ether_addr(mgmt->da) &&
2278 !is_broadcast_ether_addr(mgmt->da))
2279 return RX_DROP_MONITOR;
2280
77a121c3
JB		 2281 /* process only for station */
2282 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2283 return RX_DROP_MONITOR;
2284 break;
2285 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2286 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2287 /* process only for ibss */
2288 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2289 return RX_DROP_MONITOR;
2290 break;
2291 default:
2292 return RX_DROP_MONITOR;
2293 }
f9d540ee 2294
77a121c3 2295 /* queue up frame and kick off work to process it */
c1475ca9 2296 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2297 skb_queue_tail(&sdata->skb_queue, rx->skb);
2298 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2299 if (rx->sta)
2300 rx->sta->rx_packets++;
46900298 2301
77a121c3 2302 return RX_QUEUED;
571ecf67
JB		 2303}
2304
3b8d81e0 2305static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2306 struct ieee80211_rx_data *rx)
571ecf67 2307{
a7767f95
HH		 2308 int keyidx;
2309 unsigned int hdrlen;
571ecf67 2310
a7767f95 2311 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2312 if (rx->skb->len >= hdrlen + 4)
2313 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2314 else
2315 keyidx = -1;
2316
8944b79f 2317 if (!rx->sta) {
aa0daf0e
JB		 2318 /*
2319 * Some hardware seem to generate incorrect Michael MIC
2320 * reports; ignore them to avoid triggering countermeasures.
2321 */
af2ced6a 2322 return;
571ecf67
JB		 2323 }
2324
a7767f95 2325 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2326 return;
571ecf67 2327
05c914fe 2328 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2329 /*
2330 * APs with pairwise keys should never receive Michael MIC
2331 * errors for non-zero keyidx because these are reserved for
2332 * group keys and only the AP is sending real multicast
2333 * frames in the BSS.
2334 */
af2ced6a 2335 return;
571ecf67
JB		 2336 }
2337
a7767f95
HH		 2338 if (!ieee80211_is_data(hdr->frame_control) &&
2339 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2340 return;
571ecf67 2341
e6d6e342
JB		 2342 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2343 GFP_ATOMIC);
571ecf67
JB		 2344}
2345
5cf121c3 2346/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2347static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2348 struct ieee80211_rate *rate)
3d30d949
MW		 2349{
2350 struct ieee80211_sub_if_data *sdata;
2351 struct ieee80211_local *local = rx->local;
2352 struct ieee80211_rtap_hdr {
2353 struct ieee80211_radiotap_header hdr;
2354 u8 flags;
5f0b7de5 2355 u8 rate_or_pad;
3d30d949
MW		 2356 __le16 chan_freq;
2357 __le16 chan_flags;
bc10502d 2358 } __packed *rthdr;
3d30d949
MW		 2359 struct sk_buff *skb = rx->skb, *skb2;
2360 struct net_device *prev_dev = NULL;
eb9fb5b8 2361 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2362
554891e6
JB		 2363 /*
2364 * If cooked monitor has been processed already, then
2365 * don't do it again. If not, set the flag.
2366 */
2367 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2368 goto out_free_skb;
554891e6 2369 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2370
3d30d949
MW		 2371 if (skb_headroom(skb) < sizeof(*rthdr) &&
2372 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2373 goto out_free_skb;
2374
2375 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2376 memset(rthdr, 0, sizeof(*rthdr));
2377 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2378 rthdr->hdr.it_present =
2379 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2380 (1 << IEEE80211_RADIOTAP_CHANNEL));
2381
5f0b7de5
JB		 2382 if (rate) {
2383 rthdr->rate_or_pad = rate->bitrate / 5;
2384 rthdr->hdr.it_present |=
2385 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2386 }
3d30d949
MW		 2387 rthdr->chan_freq = cpu_to_le16(status->freq);
2388
2389 if (status->band == IEEE80211_BAND_5GHZ)
2390 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2391 IEEE80211_CHAN_5GHZ);
2392 else
2393 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2394 IEEE80211_CHAN_2GHZ);
2395
2396 skb_set_mac_header(skb, 0);
2397 skb->ip_summed = CHECKSUM_UNNECESSARY;
2398 skb->pkt_type = PACKET_OTHERHOST;
2399 skb->protocol = htons(ETH_P_802_2);
2400
2401 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2402 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2403 continue;
2404
05c914fe 2405 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2406 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2407 continue;
2408
2409 if (prev_dev) {
2410 skb2 = skb_clone(skb, GFP_ATOMIC);
2411 if (skb2) {
2412 skb2->dev = prev_dev;
5548a8a1 2413 netif_receive_skb(skb2);
3d30d949
MW		 2414 }
2415 }
2416
2417 prev_dev = sdata->dev;
2418 sdata->dev->stats.rx_packets++;
2419 sdata->dev->stats.rx_bytes += skb->len;
2420 }
2421
2422 if (prev_dev) {
2423 skb->dev = prev_dev;
5548a8a1 2424 netif_receive_skb(skb);
554891e6
JB		 2425 return;
2426 }
3d30d949
MW		 2427
2428 out_free_skb:
2429 dev_kfree_skb(skb);
2430}
2431
aa0c8636
CL		 2432static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2433 ieee80211_rx_result res)
2434{
2435 switch (res) {
2436 case RX_DROP_MONITOR:
2437 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2438 if (rx->sta)
2439 rx->sta->rx_dropped++;
2440 /* fall through */
2441 case RX_CONTINUE: {
2442 struct ieee80211_rate *rate = NULL;
2443 struct ieee80211_supported_band *sband;
2444 struct ieee80211_rx_status *status;
2445
2446 status = IEEE80211_SKB_RXCB((rx->skb));
2447
2448 sband = rx->local->hw.wiphy->bands[status->band];
2449 if (!(status->flag & RX_FLAG_HT))
2450 rate = &sband->bitrates[status->rate_idx];
2451
2452 ieee80211_rx_cooked_monitor(rx, rate);
2453 break;
2454 }
2455 case RX_DROP_UNUSABLE:
2456 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2457 if (rx->sta)
2458 rx->sta->rx_dropped++;
2459 dev_kfree_skb(rx->skb);
2460 break;
2461 case RX_QUEUED:
2462 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2463 break;
2464 }
2465}
571ecf67 2466
aa0c8636
CL		 2467static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2468 struct sk_buff_head *frames)
58905290 2469{
58905290 2470 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2471 struct sk_buff *skb;
8944b79f 2472
e32f85f7
LCC		 2473#define CALL_RXH(rxh) \
2474 do { \
2475 res = rxh(rx); \
2476 if (res != RX_CONTINUE) \
2569a826 2477 goto rxh_next; \
e32f85f7 2478 } while (0);
49461622 2479
aa0c8636 2480 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2481 /*
2482 * all the other fields are valid across frames
2483 * that belong to an aMPDU since they are on the
2484 * same TID from the same station
2485 */
2486 rx->skb = skb;
554891e6 2487 rx->flags = 0;
2569a826
JB		 2488
2489 CALL_RXH(ieee80211_rx_h_decrypt)
2490 CALL_RXH(ieee80211_rx_h_check_more_data)
2491 CALL_RXH(ieee80211_rx_h_sta_process)
2492 CALL_RXH(ieee80211_rx_h_defragment)
2493 CALL_RXH(ieee80211_rx_h_ps_poll)
2494 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2495 /* must be after MMIC verify so header is counted in MPDU mic */
2496 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2497 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2498#ifdef CONFIG_MAC80211_MESH
aa0c8636 2499 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2500 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2501#endif
2569a826
JB		 2502 CALL_RXH(ieee80211_rx_h_data)
2503
2504 /* special treatment -- needs the queue */
aa0c8636 2505 res = ieee80211_rx_h_ctrl(rx, frames);
2569a826
JB		 2506 if (res != RX_CONTINUE)
2507 goto rxh_next;
2508
2e161f78 2509 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2510 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2511 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2512 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2513 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2514
aa0c8636
CL		 2515 rxh_next:
2516 ieee80211_rx_handlers_result(rx, res);
2517
49461622 2518#undef CALL_RXH
aa0c8636
CL		 2519 }
2520}
2521
4406c376 2522static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636
CL		 2523{
2524 struct sk_buff_head reorder_release;
2525 ieee80211_rx_result res = RX_DROP_MONITOR;
2526
2527 __skb_queue_head_init(&reorder_release);
2528
aa0c8636
CL		 2529#define CALL_RXH(rxh) \
2530 do { \
2531 res = rxh(rx); \
2532 if (res != RX_CONTINUE) \
2533 goto rxh_next; \
2534 } while (0);
2535
2536 CALL_RXH(ieee80211_rx_h_passive_scan)
2537 CALL_RXH(ieee80211_rx_h_check)
2538
2539 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2540
2541 ieee80211_rx_handlers(rx, &reorder_release);
2542 return;
49461622 2543
2569a826 2544 rxh_next:
aa0c8636
CL		 2545 ieee80211_rx_handlers_result(rx, res);
2546
2547#undef CALL_RXH
58905290
JB		 2548}
2549
2bff8ebf 2550/*
dd318575
JB		 2551 * This function makes calls into the RX path, therefore
2552 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2553 */
2554void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2555{
2556 struct sk_buff_head frames;
554891e6
JB		 2557 struct ieee80211_rx_data rx = {
2558 .sta = sta,
2559 .sdata = sta->sdata,
2560 .local = sta->local,
2561 .queue = tid,
2562 };
2c15a0cf
CL		 2563 struct tid_ampdu_rx *tid_agg_rx;
2564
2565 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2566 if (!tid_agg_rx)
2567 return;
2bff8ebf
CL		 2568
2569 __skb_queue_head_init(&frames);
2570
2c15a0cf
CL		 2571 spin_lock(&tid_agg_rx->reorder_lock);
2572 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2573 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf
CL		 2574
2575 ieee80211_rx_handlers(&rx, &frames);
2576}
2577
571ecf67
JB		 2578/* main receive path */
2579
20b01f80 2580static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2581 struct ieee80211_hdr *hdr)
2582{
20b01f80 2583 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2584 struct sk_buff *skb = rx->skb;
2585 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2586 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2587 int multicast = is_multicast_ether_addr(hdr->addr1);
2588
51fb61e7 2589 switch (sdata->vif.type) {
05c914fe 2590 case NL80211_IFTYPE_STATION:
9bc383de 2591 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2592 return 0;
77fdaa12 2593 if (!multicast &&
47846c9b 2594 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2595 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2596 return 0;
554891e6 2597 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2598 }
2599 break;
05c914fe 2600 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2601 if (!bssid)
2602 return 0;
a7767f95 2603 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2604 return 1;
87291c02 2605 }
46900298 2606 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2607 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2608 return 0;
554891e6 2609 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2610 } else if (!multicast &&
47846c9b 2611 compare_ether_addr(sdata->vif.addr,
23a24def 2612 hdr->addr1) != 0) {
4150c572 2613 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2614 return 0;
554891e6 2615 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2616 } else if (!rx->sta) {
2617 int rate_idx;
eb9fb5b8 2618 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2619 rate_idx = 0; /* TODO: HT rates */
2620 else
eb9fb5b8 2621 rate_idx = status->rate_idx;
34e89507
JB		 2622 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2623 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2624 }
23a24def 2625 break;
05c914fe 2626 case NL80211_IFTYPE_MESH_POINT:
6032f934 2627 if (!multicast &&
47846c9b 2628 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2629 hdr->addr1) != 0) {
2630 if (!(sdata->dev->flags & IFF_PROMISC))
2631 return 0;
2632
554891e6 2633 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2634 }
2635 break;
05c914fe
JB		 2636 case NL80211_IFTYPE_AP_VLAN:
2637 case NL80211_IFTYPE_AP:
23a24def 2638 if (!bssid) {
47846c9b 2639 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2640 hdr->addr1))
2641 return 0;
2642 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2643 sdata->vif.addr)) {
554891e6 2644 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2645 return 0;
554891e6 2646 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2647 }
23a24def 2648 break;
05c914fe 2649 case NL80211_IFTYPE_WDS:
a7767f95 2650 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2651 return 0;
2652 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2653 return 0;
2654 break;
2ca27bcf 2655 default:
fb1c1cd6
JB		 2656 /* should never get here */
2657 WARN_ON(1);
2658 break;
23a24def
JB		 2659 }
2660
2661 return 1;
2662}
2663
4406c376
JB		 2664/*
2665 * This function returns whether or not the SKB
2666 * was destined for RX processing or not, which,
2667 * if consume is true, is equivalent to whether
2668 * or not the skb was consumed.
2669 */
2670static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2671 struct sk_buff *skb, bool consume)
2672{
2673 struct ieee80211_local *local = rx->local;
2674 struct ieee80211_sub_if_data *sdata = rx->sdata;
2675 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2676 struct ieee80211_hdr *hdr = (void *)skb->data;
2677 int prepares;
2678
2679 rx->skb = skb;
554891e6 2680 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2681 prepares = prepare_for_handlers(rx, hdr);
2682
2683 if (!prepares)
2684 return false;
2685
2686 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2687 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2688 ieee80211_rx_michael_mic_report(hdr, rx);
2689 return false;
2690 }
2691
2692 if (!consume) {
2693 skb = skb_copy(skb, GFP_ATOMIC);
2694 if (!skb) {
2695 if (net_ratelimit())
2696 wiphy_debug(local->hw.wiphy,
2697 "failed to copy multicast frame for %s\n",
2698 sdata->name);
2699 return true;
2700 }
2701
2702 rx->skb = skb;
2703 }
2704
2705 ieee80211_invoke_rx_handlers(rx);
2706 return true;
2707}
2708
571ecf67 2709/*
6368e4b1
RR		 2710 * This is the actual Rx frames handler. as it blongs to Rx path it must
2711 * be called with rcu_read_lock protection.
571ecf67 2712 */
71ebb4aa 2713static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2714 struct sk_buff *skb)
571ecf67 2715{
554891e6 2716 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2717 struct ieee80211_local *local = hw_to_local(hw);
2718 struct ieee80211_sub_if_data *sdata;
571ecf67 2719 struct ieee80211_hdr *hdr;
e3cf8b3f 2720 __le16 fc;
5cf121c3 2721 struct ieee80211_rx_data rx;
4406c376 2722 struct ieee80211_sub_if_data *prev;
56af3268 2723 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2724 int err = 0;
571ecf67 2725
e3cf8b3f 2726 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2727 memset(&rx, 0, sizeof(rx));
2728 rx.skb = skb;
2729 rx.local = local;
72abd81b 2730
e3cf8b3f 2731 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2732 local->dot11ReceivedFragmentCount++;
571ecf67 2733
142b9f50
HS		 2734 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2735 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
554891e6 2736 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2737
e3cf8b3f
ZY		 2738 if (ieee80211_is_mgmt(fc))
2739 err = skb_linearize(skb);
2740 else
2741 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2742
2743 if (err) {
2744 dev_kfree_skb(skb);
2745 return;
2746 }
2747
2748 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2749 ieee80211_parse_qos(&rx);
d1c3a37c 2750 ieee80211_verify_alignment(&rx);
38f3714d 2751
e3cf8b3f 2752 if (ieee80211_is_data(fc)) {
56af3268 2753 prev_sta = NULL;
4406c376 2754
abe60632 2755 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2756 if (!prev_sta) {
2757 prev_sta = sta;
2758 continue;
2759 }
2760
2761 rx.sta = prev_sta;
2762 rx.sdata = prev_sta->sdata;
4406c376 2763 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2764
56af3268 2765 prev_sta = sta;
4406c376 2766 }
56af3268
BG		 2767
2768 if (prev_sta) {
2769 rx.sta = prev_sta;
2770 rx.sdata = prev_sta->sdata;
2771
4406c376 2772 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2773 return;
8e26d5ad 2774 goto out;
56af3268 2775 }
4406c376
JB		 2776 }
2777
4b0dd98e 2778 prev = NULL;
b2e7771e 2779
4b0dd98e
JB		 2780 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2781 if (!ieee80211_sdata_running(sdata))
2782 continue;
340e11f3 2783
4b0dd98e
JB		 2784 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2785 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2786 continue;
340e11f3 2787
4b0dd98e
JB		 2788 /*
2789 * frame is destined for this interface, but if it's
2790 * not also for the previous one we handle that after
2791 * the loop to avoid copying the SKB once too much
2792 */
4bb29f8c 2793
4b0dd98e 2794 if (!prev) {
abe60632 2795 prev = sdata;
4b0dd98e 2796 continue;
340e11f3 2797 }
4bb29f8c 2798
4b0dd98e
JB		 2799 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2800 rx.sdata = prev;
2801 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2802
4b0dd98e
JB		 2803 prev = sdata;
2804 }
2805
2806 if (prev) {
2807 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2808 rx.sdata = prev;
4406c376 2809
4b0dd98e
JB		 2810 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2811 return;
571ecf67 2812 }
4406c376 2813
8e26d5ad 2814 out:
4406c376 2815 dev_kfree_skb(skb);
571ecf67 2816}
6368e4b1
RR		 2817
2818/*
2819 * This is the receive path handler. It is called by a low level driver when an
2820 * 802.11 MPDU is received from the hardware.
2821 */
103bf9f7 2822void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2823{
2824 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2825 struct ieee80211_rate *rate = NULL;
2826 struct ieee80211_supported_band *sband;
f1d58c25 2827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2828
d20ef63d
JB		 2829 WARN_ON_ONCE(softirq_count() == 0);
2830
77a980dc
JB		 2831 if (WARN_ON(status->band < 0 ||
2832 status->band >= IEEE80211_NUM_BANDS))
2833 goto drop;
8318d78a
JB		 2834
2835 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2836 if (WARN_ON(!sband))
2837 goto drop;
8318d78a 2838
89c3a8ac
JB		 2839 /*
2840 * If we're suspending, it is possible although not too likely
2841 * that we'd be receiving frames after having already partially
2842 * quiesced the stack. We can't process such frames then since
2843 * that might, for example, cause stations to be added or other
2844 * driver callbacks be invoked.
2845 */
77a980dc
JB		 2846 if (unlikely(local->quiescing || local->suspended))
2847 goto drop;
89c3a8ac 2848
ea77f12f
JB		 2849 /*
2850 * The same happens when we're not even started,
2851 * but that's worth a warning.
2852 */
77a980dc
JB		 2853 if (WARN_ON(!local->started))
2854 goto drop;
ea77f12f 2855
fc885189 2856 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2857 /*
fc885189
JB		 2858 * Validate the rate, unless a PLCP error means that
2859 * we probably can't have a valid rate here anyway.
e5d6eb83 2860 */
fc885189
JB		 2861
2862 if (status->flag & RX_FLAG_HT) {
2863 /*
2864 * rate_idx is MCS index, which can be [0-76]
2865 * as documented on:
2866 *
2867 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2868 *
2869 * Anything else would be some sort of driver or
2870 * hardware error. The driver should catch hardware
2871 * errors.
2872 */
2873 if (WARN((status->rate_idx < 0 ||
2874 status->rate_idx > 76),
2875 "Rate marked as an HT rate but passed "
2876 "status->rate_idx is not "
2877 "an MCS index [0-76]: %d (0x%02x)\n",
2878 status->rate_idx,
2879 status->rate_idx))
2880 goto drop;
2881 } else {
2882 if (WARN_ON(status->rate_idx < 0 ||
2883 status->rate_idx >= sband->n_bitrates))
2884 goto drop;
2885 rate = &sband->bitrates[status->rate_idx];
2886 }
0fb8ca45 2887 }
6368e4b1 2888
554891e6
JB		 2889 status->rx_flags = 0;
2890
6368e4b1
RR		 2891 /*
2892 * key references and virtual interfaces are protected using RCU
2893 * and this requires that we are in a read-side RCU section during
2894 * receive processing
2895 */
2896 rcu_read_lock();
2897
2898 /*
2899 * Frames with failed FCS/PLCP checksum are not returned,
2900 * all other frames are returned without radiotap header
2901 * if it was previously present.
2902 * Also, frames with less than 16 bytes are dropped.
2903 */
f1d58c25 2904 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2905 if (!skb) {
2906 rcu_read_unlock();
2907 return;
2908 }
2909
071d9ac2 2910 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2911
2912 rcu_read_unlock();
77a980dc
JB		 2913
2914 return;
2915 drop:
2916 kfree_skb(skb);
6368e4b1 2917}
103bf9f7 2918EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2919
2920/* This is a version of the rx handler that can be called from hard irq
2921 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2922void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2923{
2924 struct ieee80211_local *local = hw_to_local(hw);
2925
2926 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2927
571ecf67
JB		 2928 skb->pkt_type = IEEE80211_RX_MSG;
2929 skb_queue_tail(&local->skb_queue, skb);
2930 tasklet_schedule(&local->tasklet);
2931}
2932EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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