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ath9k: fix beacon restart on channel change
[linux-2.6-block.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
601ae7f2
BR		 88 return len;
89}
90
d1c3a37c 91/*
601ae7f2
BR		 92 * ieee80211_add_rx_radiotap_header - add radiotap header
93 *
94 * add a radiotap header containing all the fields which the hardware provided.
95 */
96static void
97ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98 struct sk_buff *skb,
601ae7f2
BR		 99 struct ieee80211_rate *rate,
100 int rtap_len)
101{
f1d58c25 102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 103 struct ieee80211_radiotap_header *rthdr;
104 unsigned char *pos;
6a86b9c7 105 u16 rx_flags = 0;
601ae7f2
BR		 106
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
109
110 /* radiotap header, set always present flags */
111 rthdr->it_present =
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
117
118 pos = (unsigned char *)(rthdr+1);
119
120 /* the order of the following fields is important */
121
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 124 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 125 rthdr->it_present |=
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127 pos += 8;
128 }
129
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 137 pos++;
138
139 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 140 if (status->flag & RX_FLAG_HT) {
141 /*
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147 */
148 *pos = 0;
8d6f658e 149 } else {
ebe6c7ba 150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 151 *pos = rate->bitrate / 5;
8d6f658e 152 }
601ae7f2
BR		 153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 156 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
5f0b7de5
JB		 161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
9deb1ae5 164 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
601ae7f2 167 else
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2
BR		 170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
601ae7f2
BR		 180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
601ae7f2
BR		 186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 190 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 191 pos++;
aae89831 192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
601ae7f2
BR		 195 pos += 2;
196}
197
b2e7771e
JB		 198/*
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
202 */
203static struct sk_buff *
204ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 205 struct ieee80211_rate *rate)
b2e7771e 206{
f1d58c25 207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 208 struct ieee80211_sub_if_data *sdata;
b2e7771e 209 int needed_headroom = 0;
b2e7771e
JB		 210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
b2e7771e
JB		 213
214 /*
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
218 *
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
221 */
0869aea0
JB		 222
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 225
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
228
e3cf8b3f
ZY		 229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
232 return NULL;
233 }
234
b2e7771e 235 if (!local->monitors) {
0869aea0 236 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 237 dev_kfree_skb(origskb);
238 return NULL;
239 }
240
0869aea0 241 return remove_monitor_info(local, origskb);
b2e7771e
JB		 242 }
243
0869aea0 244 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 245 /* only need to expand headroom if necessary */
246 skb = origskb;
247 origskb = NULL;
248
249 /*
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
255 */
256 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 258 dev_kfree_skb(skb);
259 return NULL;
260 }
261 } else {
262 /*
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
265 */
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
0869aea0 268 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 269
270 if (!skb)
271 return origskb;
272 }
273
0869aea0
JB		 274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 276
ce3edf6d 277 skb_reset_mac_header(skb);
b2e7771e
JB		 278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 284 continue;
285
3d30d949
MW		 286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287 continue;
288
9607e6b6 289 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 290 continue;
291
b2e7771e
JB		 292 if (prev_dev) {
293 skb2 = skb_clone(skb, GFP_ATOMIC);
294 if (skb2) {
295 skb2->dev = prev_dev;
5548a8a1 296 netif_receive_skb(skb2);
b2e7771e
JB		 297 }
298 }
299
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
303 }
304
305 if (prev_dev) {
306 skb->dev = prev_dev;
5548a8a1 307 netif_receive_skb(skb);
b2e7771e
JB		 308 } else
309 dev_kfree_skb(skb);
310
311 return origskb;
312}
313
314
5cf121c3 315static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 316{
238f74a2 317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
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];
4cfda47b 540 struct ieee80211_rx_status *status;
1edfb1af 541
dd318575
JB		 542 lockdep_assert_held(&tid_agg_rx->reorder_lock);
543
1edfb1af
JB		 544 if (!skb)
545 goto no_frame;
546
071d9ac2 547 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 548 tid_agg_rx->stored_mpdu_num--;
549 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 550 status = IEEE80211_SKB_RXCB(skb);
551 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
d29cecda 552 __skb_queue_tail(frames, skb);
1edfb1af
JB		 553
554no_frame:
555 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
556}
557
558static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
559 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 560 u16 head_seq_num,
561 struct sk_buff_head *frames)
1edfb1af
JB		 562{
563 int index;
564
dd318575
JB		 565 lockdep_assert_held(&tid_agg_rx->reorder_lock);
566
1edfb1af
JB		 567 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
568 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
569 tid_agg_rx->buf_size;
2569a826 570 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
1edfb1af
JB		 571 }
572}
573
574/*
575 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
576 * the skb was added to the buffer longer than this time ago, the earlier
577 * frames that have not yet been received are assumed to be lost and the skb
578 * can be released for processing. This may also release other skb's from the
579 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 580 *
581 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 582 */
583#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
584
aa0c8636
CL		 585static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
586 struct tid_ampdu_rx *tid_agg_rx,
587 struct sk_buff_head *frames)
588{
2bff8ebf 589 int index, j;
aa0c8636 590
dd318575
JB		 591 lockdep_assert_held(&tid_agg_rx->reorder_lock);
592
aa0c8636
CL		 593 /* release the buffer until next missing frame */
594 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
595 tid_agg_rx->buf_size;
596 if (!tid_agg_rx->reorder_buf[index] &&
597 tid_agg_rx->stored_mpdu_num > 1) {
598 /*
599 * No buffers ready to be released, but check whether any
600 * frames in the reorder buffer have timed out.
601 */
aa0c8636
CL		 602 int skipped = 1;
603 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
604 j = (j + 1) % tid_agg_rx->buf_size) {
605 if (!tid_agg_rx->reorder_buf[j]) {
606 skipped++;
607 continue;
608 }
609 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
610 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 611 goto set_release_timer;
aa0c8636
CL		 612
613#ifdef CONFIG_MAC80211_HT_DEBUG
614 if (net_ratelimit())
0fb9a9ec
JP		 615 wiphy_debug(hw->wiphy,
616 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636
CL		 617#endif
618 ieee80211_release_reorder_frame(hw, tid_agg_rx,
619 j, frames);
620
621 /*
622 * Increment the head seq# also for the skipped slots.
623 */
624 tid_agg_rx->head_seq_num =
625 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
626 skipped = 0;
627 }
628 } else while (tid_agg_rx->reorder_buf[index]) {
629 ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames);
630 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
631 tid_agg_rx->buf_size;
632 }
2bff8ebf 633
15943a72
CL		 634 /*
635 * Disable the reorder release timer for now.
636 *
637 * The current implementation lacks a proper locking scheme
638 * which would protect vital statistic and debug counters
639 * from being updated by two different but concurrent BHs.
640 *
641 * More information about the topic is available from:
642 * - thread: http://marc.info/?t=128635927000001
643 *
644 * What was wrong:
645 * => http://marc.info/?l=linux-wireless&m=128636170811964
646 * "Basically the thing is that until your patch, the data
647 * in the struct didn't actually need locking because it
648 * was accessed by the RX path only which is not concurrent."
649 *
650 * List of what needs to be fixed:
651 * => http://marc.info/?l=linux-wireless&m=128656352920957
652 *
653
2bff8ebf
CL		 654 if (tid_agg_rx->stored_mpdu_num) {
655 j = index = seq_sub(tid_agg_rx->head_seq_num,
656 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
657
658 for (; j != (index - 1) % tid_agg_rx->buf_size;
659 j = (j + 1) % tid_agg_rx->buf_size) {
660 if (tid_agg_rx->reorder_buf[j])
661 break;
662 }
663
664 set_release_timer:
665
666 mod_timer(&tid_agg_rx->reorder_timer,
667 tid_agg_rx->reorder_time[j] +
668 HT_RX_REORDER_BUF_TIMEOUT);
669 } else {
670 del_timer(&tid_agg_rx->reorder_timer);
671 }
15943a72
CL		 672 */
673
674set_release_timer:
675 return;
aa0c8636
CL		 676}
677
1edfb1af
JB		 678/*
679 * As this function belongs to the RX path it must be under
680 * rcu_read_lock protection. It returns false if the frame
681 * can be processed immediately, true if it was consumed.
682 */
683static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
684 struct tid_ampdu_rx *tid_agg_rx,
2569a826
JB		 685 struct sk_buff *skb,
686 struct sk_buff_head *frames)
1edfb1af
JB		 687{
688 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
689 u16 sc = le16_to_cpu(hdr->seq_ctrl);
690 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
691 u16 head_seq_num, buf_size;
692 int index;
2bff8ebf 693 bool ret = true;
1edfb1af 694
dd318575
JB		 695 spin_lock(&tid_agg_rx->reorder_lock);
696
1edfb1af
JB		 697 buf_size = tid_agg_rx->buf_size;
698 head_seq_num = tid_agg_rx->head_seq_num;
699
700 /* frame with out of date sequence number */
701 if (seq_less(mpdu_seq_num, head_seq_num)) {
702 dev_kfree_skb(skb);
2bff8ebf 703 goto out;
1edfb1af
JB		 704 }
705
706 /*
707 * If frame the sequence number exceeds our buffering window
708 * size release some previous frames to make room for this one.
709 */
710 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
711 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
712 /* release stored frames up to new head to stack */
2569a826
JB		 713 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num,
714 frames);
1edfb1af
JB		 715 }
716
717 /* Now the new frame is always in the range of the reordering buffer */
718
719 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
720
721 /* check if we already stored this frame */
722 if (tid_agg_rx->reorder_buf[index]) {
723 dev_kfree_skb(skb);
2bff8ebf 724 goto out;
1edfb1af
JB		 725 }
726
727 /*
728 * If the current MPDU is in the right order and nothing else
729 * is stored we can process it directly, no need to buffer it.
730 */
731 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
732 tid_agg_rx->stored_mpdu_num == 0) {
733 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 734 ret = false;
735 goto out;
1edfb1af
JB		 736 }
737
738 /* put the frame in the reordering buffer */
739 tid_agg_rx->reorder_buf[index] = skb;
740 tid_agg_rx->reorder_time[index] = jiffies;
741 tid_agg_rx->stored_mpdu_num++;
aa0c8636 742 ieee80211_sta_reorder_release(hw, tid_agg_rx, frames);
1edfb1af 743
2bff8ebf
CL		 744 out:
745 spin_unlock(&tid_agg_rx->reorder_lock);
746 return ret;
1edfb1af
JB		 747}
748
749/*
750 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
751 * true if the MPDU was buffered, false if it should be processed.
752 */
2569a826
JB		 753static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
754 struct sk_buff_head *frames)
1edfb1af 755{
2569a826
JB		 756 struct sk_buff *skb = rx->skb;
757 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 758 struct ieee80211_hw *hw = &local->hw;
759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 760 struct sta_info *sta = rx->sta;
1edfb1af
JB		 761 struct tid_ampdu_rx *tid_agg_rx;
762 u16 sc;
763 int tid;
764
765 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 766 goto dont_reorder;
1edfb1af
JB		 767
768 /*
769 * filter the QoS data rx stream according to
770 * STA/TID and check if this STA/TID is on aggregation
771 */
772
1edfb1af 773 if (!sta)
2569a826 774 goto dont_reorder;
1edfb1af
JB		 775
776 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
777
a87f736d
JB		 778 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
779 if (!tid_agg_rx)
780 goto dont_reorder;
1edfb1af
JB		 781
782 /* qos null data frames are excluded */
783 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 784 goto dont_reorder;
1edfb1af
JB		 785
786 /* new, potentially un-ordered, ampdu frame - process it */
787
788 /* reset session timer */
789 if (tid_agg_rx->timeout)
790 mod_timer(&tid_agg_rx->session_timer,
791 TU_TO_EXP_TIME(tid_agg_rx->timeout));
792
793 /* if this mpdu is fragmented - terminate rx aggregation session */
794 sc = le16_to_cpu(hdr->seq_ctrl);
795 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 796 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 797 skb_queue_tail(&rx->sdata->skb_queue, skb);
798 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 799 return;
1edfb1af
JB		 800 }
801
a87f736d
JB		 802 /*
803 * No locking needed -- we will only ever process one
804 * RX packet at a time, and thus own tid_agg_rx. All
805 * other code manipulating it needs to (and does) make
806 * sure that we cannot get to it any more before doing
807 * anything with it.
808 */
809 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
2569a826
JB		 810 return;
811
812 dont_reorder:
813 __skb_queue_tail(frames, skb);
1edfb1af 814}
33b64eb2 815
49461622 816static ieee80211_rx_result debug_noinline
5cf121c3 817ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 818{
a7767f95 819 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 820 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 821
822 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
823 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 824 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 825 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 826 hdr->seq_ctrl)) {
554891e6 827 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 828 rx->local->dot11FrameDuplicateCount++;
829 rx->sta->num_duplicates++;
830 }
e4c26add 831 return RX_DROP_MONITOR;
571ecf67 832 } else
5cf121c3 833 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 834 }
835
571ecf67
JB		 836 if (unlikely(rx->skb->len < 16)) {
837 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 838 return RX_DROP_MONITOR;
571ecf67
JB		 839 }
840
571ecf67
JB		 841 /* Drop disallowed frame classes based on STA auth/assoc state;
842 * IEEE 802.11, Chap 5.5.
843 *
ccd7b362
JB		 844 * mac80211 filters only based on association state, i.e. it drops
845 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 846 * deauth/disassoc frames when needed. In addition, hostapd is
847 * responsible for filtering on both auth and assoc states.
848 */
33b64eb2 849
902acc78 850 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 851 return ieee80211_rx_mesh_check(rx);
33b64eb2 852
a7767f95
HH		 853 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
854 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 855 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 856 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
07346f81 857 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 858 if ((!ieee80211_has_fromds(hdr->frame_control) &&
859 !ieee80211_has_tods(hdr->frame_control) &&
860 ieee80211_is_data(hdr->frame_control)) ||
554891e6 861 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 862 /* Drop IBSS frames and frames for other hosts
863 * silently. */
e4c26add 864 return RX_DROP_MONITOR;
571ecf67
JB		 865 }
866
e4c26add 867 return RX_DROP_MONITOR;
571ecf67
JB		 868 }
869
9ae54c84 870 return RX_CONTINUE;
570bd537
JB		 871}
872
873
49461622 874static ieee80211_rx_result debug_noinline
5cf121c3 875ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 876{
eb9fb5b8
JB		 877 struct sk_buff *skb = rx->skb;
878 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
879 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 880 int keyidx;
881 int hdrlen;
e4c26add 882 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 883 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 884 int mmie_keyidx = -1;
761ab470 885 __le16 fc;
570bd537 886
3017b80b
JB		 887 /*
888 * Key selection 101
889 *
3cfcf6ac 890 * There are four types of keys:
3017b80b 891 * - GTK (group keys)
3cfcf6ac 892 * - IGTK (group keys for management frames)
3017b80b
JB		 893 * - PTK (pairwise keys)
894 * - STK (station-to-station pairwise keys)
895 *
896 * When selecting a key, we have to distinguish between multicast
897 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 898 * use PTKs and STKs while the former always use GTKs and IGTKs.
899 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
900 * unicast frames can also use key indices like GTKs. Hence, if we
901 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 902 *
8dc06a1c
JB		 903 * Note that in a regular BSS, multicast frames are sent by the
904 * AP only, associated stations unicast the frame to the AP first
905 * which then multicasts it on their behalf.
906 *
3017b80b
JB		 907 * There is also a slight problem in IBSS mode: GTKs are negotiated
908 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 909 * The spec seems to expect that one negotiates the same key with
910 * every station but there's no such requirement; VLANs could be
911 * possible.
3017b80b
JB		 912 */
913
3017b80b 914 /*
1990af8d 915 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 916 * addressed to us nor a multicast frame.
917 */
554891e6 918 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 919 return RX_CONTINUE;
3017b80b 920
2569a826
JB		 921 /* start without a key */
922 rx->key = NULL;
923
d4e46a3d 924 if (rx->sta)
e31b8213 925 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 926
761ab470
JB		 927 fc = hdr->frame_control;
928
929 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 930 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
931
e31b8213
JB		 932 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
933 rx->key = sta_ptk;
dc1580dd
JB		 934 if ((status->flag & RX_FLAG_DECRYPTED) &&
935 (status->flag & RX_FLAG_IV_STRIPPED))
936 return RX_CONTINUE;
0c7c10c7 937 /* Skip decryption if the frame is not protected. */
761ab470 938 if (!ieee80211_has_protected(fc))
0c7c10c7 939 return RX_CONTINUE;
3cfcf6ac
JM		 940 } else if (mmie_keyidx >= 0) {
941 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 942 if ((status->flag & RX_FLAG_DECRYPTED) &&
943 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 944 return RX_CONTINUE;
945
946 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
947 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
948 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 949 if (rx->sta)
950 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
951 if (!rx->key)
952 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 953 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 954 /*
955 * The frame was not protected, so skip decryption. However, we
956 * need to set rx->key if there is a key that could have been
957 * used so that the frame may be dropped if encryption would
958 * have been expected.
959 */
960 struct ieee80211_key *key = NULL;
897bed8b
JB		 961 struct ieee80211_sub_if_data *sdata = rx->sdata;
962 int i;
963
761ab470 964 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 965 is_multicast_ether_addr(hdr->addr1) &&
966 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
967 rx->key = key;
897bed8b
JB		 968 else {
969 if (rx->sta) {
970 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
971 key = rcu_dereference(rx->sta->gtk[i]);
972 if (key)
973 break;
974 }
975 }
976 if (!key) {
977 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
978 key = rcu_dereference(sdata->keys[i]);
979 if (key)
980 break;
981 }
982 }
983 if (key)
984 rx->key = key;
985 }
0c7c10c7 986 return RX_CONTINUE;
571ecf67 987 } else {
39184b15 988 u8 keyid;
3017b80b
JB		 989 /*
990 * The device doesn't give us the IV so we won't be
991 * able to look up the key. That's ok though, we
992 * don't need to decrypt the frame, we just won't
993 * be able to keep statistics accurate.
994 * Except for key threshold notifications, should
995 * we somehow allow the driver to tell us which key
996 * the hardware used if this flag is set?
997 */
eb9fb5b8
JB		 998 if ((status->flag & RX_FLAG_DECRYPTED) &&
999 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 1000 return RX_CONTINUE;
3017b80b 1001
761ab470 1002 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 1003
1004 if (rx->skb->len < 8 + hdrlen)
e4c26add 1005 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1006
1007 /*
1008 * no need to call ieee80211_wep_get_keyidx,
1009 * it verifies a bunch of things we've done already
1010 */
39184b15
ZY		 1011 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1012 keyidx = keyid >> 6;
3017b80b 1013
e31b8213
JB		 1014 /* check per-station GTK first, if multicast packet */
1015 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1016 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1017
e31b8213
JB		 1018 /* if not found, try default key */
1019 if (!rx->key) {
1020 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1021
1022 /*
1023 * RSNA-protected unicast frames should always be
1024 * sent with pairwise or station-to-station keys,
1025 * but for WEP we allow using a key index as well.
1026 */
1027 if (rx->key &&
1028 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1029 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1030 !is_multicast_ether_addr(hdr->addr1))
1031 rx->key = NULL;
1032 }
571ecf67
JB		 1033 }
1034
3017b80b 1035 if (rx->key) {
571ecf67 1036 rx->key->tx_rx_count++;
011bfcc4 1037 /* TODO: add threshold stuff again */
1990af8d 1038 } else {
e4c26add 1039 return RX_DROP_MONITOR;
70f08765
JB		 1040 }
1041
39184b15
ZY		 1042 if (skb_linearize(rx->skb))
1043 return RX_DROP_UNUSABLE;
761ab470 1044 /* the hdr variable is invalid now! */
1990af8d 1045
97359d12
JB		 1046 switch (rx->key->conf.cipher) {
1047 case WLAN_CIPHER_SUITE_WEP40:
1048 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1049 /* Check for weak IVs if possible */
1050 if (rx->sta && ieee80211_is_data(fc) &&
1051 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1052 !(status->flag & RX_FLAG_DECRYPTED)) &&
1053 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1054 rx->sta->wep_weak_iv_count++;
1055
e2f036da
MN		 1056 result = ieee80211_crypto_wep_decrypt(rx);
1057 break;
97359d12 1058 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1059 result = ieee80211_crypto_tkip_decrypt(rx);
1060 break;
97359d12 1061 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1062 result = ieee80211_crypto_ccmp_decrypt(rx);
1063 break;
97359d12 1064 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1065 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1066 break;
3ffc2a90
JB		 1067 default:
1068 /*
1069 * We can reach here only with HW-only algorithms
1070 * but why didn't it decrypt the frame?!
1071 */
1072 return RX_DROP_UNUSABLE;
70f08765
JB		 1073 }
1074
e2f036da 1075 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1076 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1077
1078 return result;
70f08765
JB		 1079}
1080
572e0012
KV		 1081static ieee80211_rx_result debug_noinline
1082ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1083{
1084 struct ieee80211_local *local;
1085 struct ieee80211_hdr *hdr;
1086 struct sk_buff *skb;
1087
1088 local = rx->local;
1089 skb = rx->skb;
1090 hdr = (struct ieee80211_hdr *) skb->data;
1091
1092 if (!local->pspolling)
1093 return RX_CONTINUE;
1094
1095 if (!ieee80211_has_fromds(hdr->frame_control))
1096 /* this is not from AP */
1097 return RX_CONTINUE;
1098
1099 if (!ieee80211_is_data(hdr->frame_control))
1100 return RX_CONTINUE;
1101
1102 if (!ieee80211_has_moredata(hdr->frame_control)) {
1103 /* AP has no more frames buffered for us */
1104 local->pspolling = false;
1105 return RX_CONTINUE;
1106 }
1107
1108 /* more data bit is set, let's request a new frame from the AP */
1109 ieee80211_send_pspoll(local, rx->sdata);
1110
1111 return RX_CONTINUE;
1112}
1113
133b8226 1114static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1115{
133b8226 1116 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1117 struct ieee80211_local *local = sdata->local;
0795af57 1118
3e122be0 1119 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1120 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1121 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1122#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1123 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1124 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1125#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1126}
1127
ff9458d3 1128static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1129{
133b8226 1130 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1131
3e122be0 1132 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1133
571ecf67 1134#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1135 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1136 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1137#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1138
af818581 1139 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1140#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1141 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1142 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1143#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1144 return;
1145 }
1146
1147 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1148}
1149
49461622 1150static ieee80211_rx_result debug_noinline
5cf121c3 1151ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1152{
1153 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1154 struct sk_buff *skb = rx->skb;
1155 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1156 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1157
1158 if (!sta)
9ae54c84 1159 return RX_CONTINUE;
571ecf67 1160
b291ba11
JB		 1161 /*
1162 * Update last_rx only for IBSS packets which are for the current
1163 * BSSID to avoid keeping the current IBSS network alive in cases
1164 * where other STAs start using different BSSID.
1165 */
05c914fe 1166 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1167 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1168 NL80211_IFTYPE_ADHOC);
46900298 1169 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1170 sta->last_rx = jiffies;
b291ba11
JB		 1171 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1172 /*
33b64eb2
LCC		 1173 * Mesh beacons will update last_rx when if they are found to
1174 * match the current local configuration when processed.
571ecf67 1175 */
b291ba11 1176 sta->last_rx = jiffies;
571ecf67
JB		 1177 }
1178
554891e6 1179 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1180 return RX_CONTINUE;
571ecf67 1181
3cf335d5
KV		 1182 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1183 ieee80211_sta_rx_notify(rx->sdata, hdr);
1184
571ecf67
JB		 1185 sta->rx_fragments++;
1186 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1187 sta->last_signal = status->signal;
541a45a1 1188 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1189
72eaa43a
JB		 1190 /*
1191 * Change STA power saving mode only at the end of a frame
1192 * exchange sequence.
1193 */
3e122be0 1194 if (!ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1195 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1196 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1197 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1198 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1199 /*
1200 * Ignore doze->wake transitions that are
1201 * indicated by non-data frames, the standard
1202 * is unclear here, but for example going to
1203 * PS mode and then scanning would cause a
1204 * doze->wake transition for the probe request,
1205 * and that is clearly undesirable.
1206 */
1207 if (ieee80211_is_data(hdr->frame_control) &&
1208 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1209 ap_sta_ps_end(sta);
72eaa43a
JB		 1210 } else {
1211 if (ieee80211_has_pm(hdr->frame_control))
1212 ap_sta_ps_start(sta);
1213 }
571ecf67
JB		 1214 }
1215
22403def
JB		 1216 /*
1217 * Drop (qos-)data::nullfunc frames silently, since they
1218 * are used only to control station power saving mode.
1219 */
1220 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1221 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1222 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1223
1224 /*
1225 * If we receive a 4-addr nullfunc frame from a STA
1226 * that was not moved to a 4-addr STA vlan yet, drop
1227 * the frame to the monitor interface, to make sure
1228 * that hostapd sees it
1229 */
1230 if (ieee80211_has_a4(hdr->frame_control) &&
1231 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1232 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1233 !rx->sdata->u.vlan.sta)))
1234 return RX_DROP_MONITOR;
22403def
JB		 1235 /*
1236 * Update counter and free packet here to avoid
1237 * counting this as a dropped packed.
1238 */
571ecf67
JB		 1239 sta->rx_packets++;
1240 dev_kfree_skb(rx->skb);
9ae54c84 1241 return RX_QUEUED;
571ecf67
JB		 1242 }
1243
9ae54c84 1244 return RX_CONTINUE;
571ecf67
JB		 1245} /* ieee80211_rx_h_sta_process */
1246
571ecf67
JB		 1247static inline struct ieee80211_fragment_entry *
1248ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1249 unsigned int frag, unsigned int seq, int rx_queue,
1250 struct sk_buff **skb)
1251{
1252 struct ieee80211_fragment_entry *entry;
1253 int idx;
1254
1255 idx = sdata->fragment_next;
1256 entry = &sdata->fragments[sdata->fragment_next++];
1257 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1258 sdata->fragment_next = 0;
1259
1260 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1261#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1262 struct ieee80211_hdr *hdr =
1263 (struct ieee80211_hdr *) entry->skb_list.next->data;
1264 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1265 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1266 "addr1=%pM addr2=%pM\n",
47846c9b 1267 sdata->name, idx,
571ecf67 1268 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1269 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1270#endif
571ecf67
JB		 1271 __skb_queue_purge(&entry->skb_list);
1272 }
1273
1274 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1275 *skb = NULL;
1276 entry->first_frag_time = jiffies;
1277 entry->seq = seq;
1278 entry->rx_queue = rx_queue;
1279 entry->last_frag = frag;
1280 entry->ccmp = 0;
1281 entry->extra_len = 0;
1282
1283 return entry;
1284}
1285
1286static inline struct ieee80211_fragment_entry *
1287ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1288 unsigned int frag, unsigned int seq,
571ecf67
JB		 1289 int rx_queue, struct ieee80211_hdr *hdr)
1290{
1291 struct ieee80211_fragment_entry *entry;
1292 int i, idx;
1293
1294 idx = sdata->fragment_next;
1295 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1296 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1297
1298 idx--;
1299 if (idx < 0)
1300 idx = IEEE80211_FRAGMENT_MAX - 1;
1301
1302 entry = &sdata->fragments[idx];
1303 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1304 entry->rx_queue != rx_queue ||
1305 entry->last_frag + 1 != frag)
1306 continue;
1307
b73d70ad 1308 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1309
b73d70ad
HH		 1310 /*
1311 * Check ftype and addresses are equal, else check next fragment
1312 */
1313 if (((hdr->frame_control ^ f_hdr->frame_control) &
1314 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1315 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1316 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1317 continue;
1318
ab46623e 1319 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1320 __skb_queue_purge(&entry->skb_list);
1321 continue;
1322 }
1323 return entry;
1324 }
1325
1326 return NULL;
1327}
1328
49461622 1329static ieee80211_rx_result debug_noinline
5cf121c3 1330ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1331{
1332 struct ieee80211_hdr *hdr;
1333 u16 sc;
358c8d9d 1334 __le16 fc;
571ecf67
JB		 1335 unsigned int frag, seq;
1336 struct ieee80211_fragment_entry *entry;
1337 struct sk_buff *skb;
554891e6 1338 struct ieee80211_rx_status *status;
571ecf67 1339
b73d70ad 1340 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1341 fc = hdr->frame_control;
571ecf67
JB		 1342 sc = le16_to_cpu(hdr->seq_ctrl);
1343 frag = sc & IEEE80211_SCTL_FRAG;
1344
358c8d9d 1345 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1346 (rx->skb)->len < 24 ||
1347 is_multicast_ether_addr(hdr->addr1))) {
1348 /* not fragmented */
1349 goto out;
1350 }
1351 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1352
e3cf8b3f
ZY		 1353 if (skb_linearize(rx->skb))
1354 return RX_DROP_UNUSABLE;
1355
058897a4
AK		 1356 /*
1357 * skb_linearize() might change the skb->data and
1358 * previously cached variables (in this case, hdr) need to
1359 * be refreshed with the new data.
1360 */
1361 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1362 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1363
1364 if (frag == 0) {
1365 /* This is the first fragment of a new frame. */
1366 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1367 rx->queue, &(rx->skb));
97359d12 1368 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1369 ieee80211_has_protected(fc)) {
9190252c
JM		 1370 int queue = ieee80211_is_mgmt(fc) ?
1371 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1372 /* Store CCMP PN so that we can verify that the next
1373 * fragment has a sequential PN value. */
1374 entry->ccmp = 1;
1375 memcpy(entry->last_pn,
9190252c 1376 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1377 CCMP_PN_LEN);
1378 }
9ae54c84 1379 return RX_QUEUED;
571ecf67
JB		 1380 }
1381
1382 /* This is a fragment for a frame that should already be pending in
1383 * fragment cache. Add this fragment to the end of the pending entry.
1384 */
b73d70ad 1385 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1386 if (!entry) {
1387 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1388 return RX_DROP_MONITOR;
571ecf67
JB		 1389 }
1390
1391 /* Verify that MPDUs within one MSDU have sequential PN values.
1392 * (IEEE 802.11i, 8.3.3.4.5) */
1393 if (entry->ccmp) {
1394 int i;
1395 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1396 int queue;
97359d12 1397 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1398 return RX_DROP_UNUSABLE;
571ecf67
JB		 1399 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1400 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1401 pn[i]++;
1402 if (pn[i])
1403 break;
1404 }
9190252c
JM		 1405 queue = ieee80211_is_mgmt(fc) ?
1406 NUM_RX_DATA_QUEUES : rx->queue;
1407 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1408 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1409 return RX_DROP_UNUSABLE;
571ecf67
JB		 1410 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1411 }
1412
358c8d9d 1413 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1414 __skb_queue_tail(&entry->skb_list, rx->skb);
1415 entry->last_frag = frag;
1416 entry->extra_len += rx->skb->len;
358c8d9d 1417 if (ieee80211_has_morefrags(fc)) {
571ecf67 1418 rx->skb = NULL;
9ae54c84 1419 return RX_QUEUED;
571ecf67
JB		 1420 }
1421
1422 rx->skb = __skb_dequeue(&entry->skb_list);
1423 if (skb_tailroom(rx->skb) < entry->extra_len) {
1424 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1425 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1426 GFP_ATOMIC))) {
1427 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1428 __skb_queue_purge(&entry->skb_list);
e4c26add 1429 return RX_DROP_UNUSABLE;
571ecf67
JB		 1430 }
1431 }
1432 while ((skb = __skb_dequeue(&entry->skb_list))) {
1433 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1434 dev_kfree_skb(skb);
1435 }
1436
1437 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1438 status = IEEE80211_SKB_RXCB(rx->skb);
1439 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1440
1441 out:
1442 if (rx->sta)
1443 rx->sta->rx_packets++;
1444 if (is_multicast_ether_addr(hdr->addr1))
1445 rx->local->dot11MulticastReceivedFrameCount++;
1446 else
1447 ieee80211_led_rx(rx->local);
9ae54c84 1448 return RX_CONTINUE;
571ecf67
JB		 1449}
1450
49461622 1451static ieee80211_rx_result debug_noinline
5cf121c3 1452ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1453{
af818581 1454 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1455 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1456 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1457
358c8d9d 1458 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1459 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1460 return RX_CONTINUE;
571ecf67 1461
05c914fe
JB		 1462 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1463 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1464 return RX_DROP_UNUSABLE;
98f0b0a3 1465
af818581
JB		 1466 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1467 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1468 else
1469 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1470
9ae54c84 1471 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1472 * count as an dropped frame. */
1473 dev_kfree_skb(rx->skb);
1474
9ae54c84 1475 return RX_QUEUED;
571ecf67
JB		 1476}
1477
49461622 1478static ieee80211_rx_result debug_noinline
5cf121c3 1479ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1480{
6e0d114d 1481 u8 *data = rx->skb->data;
238f74a2 1482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1483
238f74a2 1484 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1485 return RX_CONTINUE;
6e0d114d
JB		 1486
1487 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1488 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1489 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1490 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1491 /* change frame type to non QOS */
238f74a2 1492 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1493
9ae54c84 1494 return RX_CONTINUE;
6e0d114d
JB		 1495}
1496
76ee65bf 1497static int
5cf121c3 1498ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1499{
07346f81 1500 if (unlikely(!rx->sta ||
f4ea83dd 1501 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1502 return -EACCES;
571ecf67 1503
76ee65bf 1504 return 0;
571ecf67
JB		 1505}
1506
76ee65bf 1507static int
358c8d9d 1508ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1509{
eb9fb5b8
JB		 1510 struct sk_buff *skb = rx->skb;
1511 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1512
3017b80b 1513 /*
7848ba7d
JB		 1514 * Pass through unencrypted frames if the hardware has
1515 * decrypted them already.
3017b80b 1516 */
eb9fb5b8 1517 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1518 return 0;
571ecf67
JB		 1519
1520 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1521 if (unlikely(!ieee80211_has_protected(fc) &&
1522 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1523 ieee80211_is_data(fc) &&
b3fc9c6c 1524 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1525 return -EACCES;
bef5d1c7
JB		 1526
1527 return 0;
1528}
1529
1530static int
1531ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1532{
1533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1534 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1535 __le16 fc = hdr->frame_control;
bef5d1c7 1536
e3efca0a
JM		 1537 /*
1538 * Pass through unencrypted frames if the hardware has
1539 * decrypted them already.
1540 */
1541 if (status->flag & RX_FLAG_DECRYPTED)
1542 return 0;
bef5d1c7 1543
f2ca3ea4 1544 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1545 if (unlikely(!ieee80211_has_protected(fc) &&
1546 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1547 rx->key)) {
1548 if (ieee80211_is_deauth(fc))
1549 cfg80211_send_unprot_deauth(rx->sdata->dev,
1550 rx->skb->data,
1551 rx->skb->len);
1552 else if (ieee80211_is_disassoc(fc))
1553 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1554 rx->skb->data,
1555 rx->skb->len);
f2ca3ea4 1556 return -EACCES;
cf4e594e 1557 }
f2ca3ea4 1558 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1559 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1560 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1561 if (ieee80211_is_deauth(fc))
1562 cfg80211_send_unprot_deauth(rx->sdata->dev,
1563 rx->skb->data,
1564 rx->skb->len);
1565 else if (ieee80211_is_disassoc(fc))
1566 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1567 rx->skb->data,
1568 rx->skb->len);
f2ca3ea4 1569 return -EACCES;
cf4e594e 1570 }
f2ca3ea4
JM		 1571 /*
1572 * When using MFP, Action frames are not allowed prior to
1573 * having configured keys.
1574 */
1575 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1576 ieee80211_is_robust_mgmt_frame(
1577 (struct ieee80211_hdr *) rx->skb->data)))
1578 return -EACCES;
1579 }
b3fc9c6c 1580
76ee65bf 1581 return 0;
571ecf67
JB		 1582}
1583
76ee65bf 1584static int
e31a16d6 1585__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1586{
eb9fb5b8 1587 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee
FF		 1588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1589
9bc383de
JB		 1590 if (ieee80211_has_a4(hdr->frame_control) &&
1591 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1592 return -1;
9bc383de
JB		 1593
1594 if (is_multicast_ether_addr(hdr->addr1) &&
1595 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1596 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
f14543ee 1597 return -1;
571ecf67 1598
47846c9b 1599 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
76ee65bf 1600}
571ecf67 1601
ce3edf6d
JB		 1602/*
1603 * requires that rx->skb is a frame with ethernet header
1604 */
358c8d9d 1605static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1606{
c97c23e3 1607 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1608 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1609 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1610
1611 /*
1612 * Allow EAPOL frames to us/the PAE group address regardless
1613 * of whether the frame was encrypted or not.
1614 */
a621fa4d 1615 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1616 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1617 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1618 return true;
1619
1620 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1621 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1622 return false;
1623
1624 return true;
1625}
1626
1627/*
1628 * requires that rx->skb is a frame with ethernet header
1629 */
76ee65bf 1630static void
5cf121c3 1631ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1632{
eb9fb5b8
JB		 1633 struct ieee80211_sub_if_data *sdata = rx->sdata;
1634 struct net_device *dev = sdata->dev;
76ee65bf 1635 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1636 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1637 struct sta_info *dsta;
554891e6 1638 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1639
76ee65bf
RR		 1640 skb = rx->skb;
1641 xmit_skb = NULL;
571ecf67 1642
05c914fe
JB		 1643 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1644 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1645 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1646 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1647 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1648 if (is_multicast_ether_addr(ehdr->h_dest)) {
1649 /*
1650 * send multicast frames both to higher layers in
1651 * local net stack and back to the wireless medium
1652 */
76ee65bf
RR		 1653 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1654 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1655 printk(KERN_DEBUG "%s: failed to clone "
1656 "multicast frame\n", dev->name);
1657 } else {
abe60632
JB		 1658 dsta = sta_info_get(sdata, skb->data);
1659 if (dsta) {
ce3edf6d
JB		 1660 /*
1661 * The destination station is associated to
1662 * this AP (in this VLAN), so send the frame
1663 * directly to it and do not pass it to local
1664 * net stack.
571ecf67 1665 */
76ee65bf 1666 xmit_skb = skb;
571ecf67
JB		 1667 skb = NULL;
1668 }
571ecf67
JB		 1669 }
1670 }
1671
1672 if (skb) {
d1c3a37c
JB		 1673 int align __maybe_unused;
1674
59d9cb07 1675#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1676 /*
1677 * 'align' will only take the values 0 or 2 here
1678 * since all frames are required to be aligned
1679 * to 2-byte boundaries when being passed to
1680 * mac80211. That also explains the __skb_push()
1681 * below.
1682 */
dacb6f1d 1683 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1684 if (align) {
1685 if (WARN_ON(skb_headroom(skb) < 3)) {
1686 dev_kfree_skb(skb);
1687 skb = NULL;
1688 } else {
1689 u8 *data = skb->data;
8ce0b589
ZY		 1690 size_t len = skb_headlen(skb);
1691 skb->data -= align;
1692 memmove(skb->data, data, len);
1693 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1694 }
1695 }
1696#endif
1697
1698 if (skb) {
1699 /* deliver to local stack */
1700 skb->protocol = eth_type_trans(skb, dev);
1701 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1702 netif_receive_skb(skb);
d1c3a37c 1703 }
571ecf67
JB		 1704 }
1705
76ee65bf 1706 if (xmit_skb) {
571ecf67 1707 /* send to wireless media */
f831e909 1708 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1709 skb_reset_network_header(xmit_skb);
1710 skb_reset_mac_header(xmit_skb);
76ee65bf 1711 dev_queue_xmit(xmit_skb);
571ecf67 1712 }
76ee65bf
RR		 1713}
1714
49461622 1715static ieee80211_rx_result debug_noinline
5cf121c3 1716ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1717{
eb9fb5b8 1718 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1719 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1720 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1721 __le16 fc = hdr->frame_control;
eaf85ca7 1722 struct sk_buff_head frame_list;
554891e6 1723 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1724
358c8d9d 1725 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1726 return RX_CONTINUE;
fd4c7f2f 1727
358c8d9d 1728 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1729 return RX_DROP_MONITOR;
fd4c7f2f 1730
554891e6 1731 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1732 return RX_CONTINUE;
fd4c7f2f 1733
eaf85ca7
ZY		 1734 if (ieee80211_has_a4(hdr->frame_control) &&
1735 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1736 !rx->sdata->u.vlan.sta)
e4c26add 1737 return RX_DROP_UNUSABLE;
fd4c7f2f 1738
eaf85ca7
ZY		 1739 if (is_multicast_ether_addr(hdr->addr1) &&
1740 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1741 rx->sdata->u.vlan.sta) ||
1742 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1743 rx->sdata->u.mgd.use_4addr)))
e4c26add 1744 return RX_DROP_UNUSABLE;
fd4c7f2f 1745
eaf85ca7
ZY		 1746 skb->dev = dev;
1747 __skb_queue_head_init(&frame_list);
fd4c7f2f 1748
e3cf8b3f
ZY		 1749 if (skb_linearize(skb))
1750 return RX_DROP_UNUSABLE;
1751
eaf85ca7
ZY		 1752 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1753 rx->sdata->vif.type,
1754 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1755
eaf85ca7
ZY		 1756 while (!skb_queue_empty(&frame_list)) {
1757 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1758
358c8d9d 1759 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1760 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1761 continue;
1762 }
eaf85ca7
ZY		 1763 dev->stats.rx_packets++;
1764 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1765
1766 ieee80211_deliver_skb(rx);
1767 }
1768
9ae54c84 1769 return RX_QUEUED;
fd4c7f2f
RR		 1770}
1771
bf94e17b 1772#ifdef CONFIG_MAC80211_MESH
b0dee578 1773static ieee80211_rx_result
e32f85f7
LCC		 1774ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1775{
1776 struct ieee80211_hdr *hdr;
1777 struct ieee80211s_hdr *mesh_hdr;
1778 unsigned int hdrlen;
1779 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1780 struct ieee80211_local *local = rx->local;
eb9fb5b8 1781 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1782 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1783
1784 hdr = (struct ieee80211_hdr *) skb->data;
1785 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1786 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1787
1788 if (!ieee80211_is_data(hdr->frame_control))
1789 return RX_CONTINUE;
1790
1791 if (!mesh_hdr->ttl)
1792 /* illegal frame */
1793 return RX_DROP_MONITOR;
1794
43b7b314 1795 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1796 struct mesh_path *mppath;
43b7b314
JC		 1797 char *proxied_addr;
1798 char *mpp_addr;
1799
1800 if (is_multicast_ether_addr(hdr->addr1)) {
1801 mpp_addr = hdr->addr3;
1802 proxied_addr = mesh_hdr->eaddr1;
1803 } else {
1804 mpp_addr = hdr->addr4;
1805 proxied_addr = mesh_hdr->eaddr2;
1806 }
79617dee 1807
79617dee 1808 rcu_read_lock();
43b7b314 1809 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1810 if (!mppath) {
43b7b314 1811 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1812 } else {
1813 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1814 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1815 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1816 spin_unlock_bh(&mppath->state_lock);
1817 }
1818 rcu_read_unlock();
1819 }
1820
3c5772a5
JC		 1821 /* Frame has reached destination. Don't forward */
1822 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1823 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1824 return RX_CONTINUE;
1825
1826 mesh_hdr->ttl--;
1827
554891e6 1828 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1829 if (!mesh_hdr->ttl)
472dbc45 1830 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1831 dropped_frames_ttl);
1832 else {
1833 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1834 struct ieee80211_tx_info *info;
1835
e32f85f7
LCC		 1836 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1837
1838 if (!fwd_skb && net_ratelimit())
1839 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1840 sdata->name);
e32f85f7
LCC		 1841
1842 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1843 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1844 info = IEEE80211_SKB_CB(fwd_skb);
1845 memset(info, 0, sizeof(*info));
1846 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1847 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1848 skb_set_queue_mapping(skb,
1849 ieee80211_select_queue(rx->sdata, fwd_skb));
1850 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1851 if (is_multicast_ether_addr(fwd_hdr->addr1))
1852 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1853 fwded_mcast);
1854 else {
3c5772a5
JC		 1855 int err;
1856 /*
1857 * Save TA to addr1 to send TA a path error if a
1858 * suitable next hop is not found
1859 */
1860 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1861 ETH_ALEN);
3c5772a5 1862 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1863 /* Failed to immediately resolve next hop:
1864 * fwded frame was dropped or will be added
1865 * later to the pending skb queue. */
1866 if (err)
1867 return RX_DROP_MONITOR;
c8a61a7d
DW		 1868
1869 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1870 fwded_unicast);
249b405c
JC		 1871 }
1872 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1873 fwded_frames);
3b8d81e0 1874 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1875 }
1876 }
1877
3c5772a5 1878 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1879 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1880 return RX_CONTINUE;
1881 else
1882 return RX_DROP_MONITOR;
1883}
bf94e17b 1884#endif
e32f85f7 1885
49461622 1886static ieee80211_rx_result debug_noinline
5cf121c3 1887ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1888{
eb9fb5b8 1889 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1890 struct ieee80211_local *local = rx->local;
eb9fb5b8 1891 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1892 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1893 __le16 fc = hdr->frame_control;
ce3edf6d 1894 int err;
76ee65bf 1895
358c8d9d 1896 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1897 return RX_CONTINUE;
76ee65bf 1898
358c8d9d 1899 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1900 return RX_DROP_MONITOR;
76ee65bf 1901
f14543ee
FF		 1902 /*
1903 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1904 * that a 4-addr station can be detected and moved into a separate VLAN
1905 */
1906 if (ieee80211_has_a4(hdr->frame_control) &&
1907 sdata->vif.type == NL80211_IFTYPE_AP)
1908 return RX_DROP_MONITOR;
1909
e31a16d6 1910 err = __ieee80211_data_to_8023(rx);
76ee65bf 1911 if (unlikely(err))
e4c26add 1912 return RX_DROP_UNUSABLE;
76ee65bf 1913
358c8d9d 1914 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1915 return RX_DROP_MONITOR;
ce3edf6d 1916
76ee65bf
RR		 1917 rx->skb->dev = dev;
1918
1919 dev->stats.rx_packets++;
1920 dev->stats.rx_bytes += rx->skb->len;
1921
08ca944e
HS		 1922 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1923 !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) {
e15276a4
VN		 1924 mod_timer(&local->dynamic_ps_timer, jiffies +
1925 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1926 }
1927
76ee65bf 1928 ieee80211_deliver_skb(rx);
571ecf67 1929
9ae54c84 1930 return RX_QUEUED;
571ecf67
JB		 1931}
1932
49461622 1933static ieee80211_rx_result debug_noinline
2569a826 1934ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
71364716
RR		 1935{
1936 struct ieee80211_local *local = rx->local;
1937 struct ieee80211_hw *hw = &local->hw;
1938 struct sk_buff *skb = rx->skb;
a7767f95 1939 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1940 struct tid_ampdu_rx *tid_agg_rx;
1941 u16 start_seq_num;
1942 u16 tid;
1943
a7767f95 1944 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1945 return RX_CONTINUE;
71364716 1946
a7767f95 1947 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1948 struct {
1949 __le16 control, start_seq_num;
1950 } __packed bar_data;
1951
71364716 1952 if (!rx->sta)
a02ae758 1953 return RX_DROP_MONITOR;
8ae5977f
JB		 1954
1955 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1956 &bar_data, sizeof(bar_data)))
1957 return RX_DROP_MONITOR;
1958
8ae5977f 1959 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1960
1961 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1962 if (!tid_agg_rx)
a02ae758 1963 return RX_DROP_MONITOR;
71364716 1964
8ae5977f 1965 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1966
1967 /* reset session timer */
20ad19d0
JB		 1968 if (tid_agg_rx->timeout)
1969 mod_timer(&tid_agg_rx->session_timer,
1970 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1971
dd318575 1972 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 1973 /* release stored frames up to start of BAR */
2569a826
JB		 1974 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
1975 frames);
dd318575
JB		 1976 spin_unlock(&tid_agg_rx->reorder_lock);
1977
a02ae758
JB		 1978 kfree_skb(skb);
1979 return RX_QUEUED;
71364716
RR		 1980 }
1981
08daecae
JB		 1982 /*
1983 * After this point, we only want management frames,
1984 * so we can drop all remaining control frames to
1985 * cooked monitor interfaces.
1986 */
1987 return RX_DROP_MONITOR;
71364716
RR		 1988}
1989
f4f727a6
JM		 1990static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1991 struct ieee80211_mgmt *mgmt,
1992 size_t len)
fea14732
JM		 1993{
1994 struct ieee80211_local *local = sdata->local;
1995 struct sk_buff *skb;
1996 struct ieee80211_mgmt *resp;
1997
47846c9b 1998 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 1999 /* Not to own unicast address */
2000 return;
2001 }
2002
46900298
JB		 2003 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2004 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2005 /* Not from the current AP or not associated yet. */
fea14732
JM		 2006 return;
2007 }
2008
2009 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2010 /* Too short SA Query request frame */
2011 return;
2012 }
2013
2014 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2015 if (skb == NULL)
2016 return;
2017
2018 skb_reserve(skb, local->hw.extra_tx_headroom);
2019 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2020 memset(resp, 0, 24);
2021 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2022 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2023 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2024 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2025 IEEE80211_STYPE_ACTION);
2026 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2027 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2028 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2029 memcpy(resp->u.action.u.sa_query.trans_id,
2030 mgmt->u.action.u.sa_query.trans_id,
2031 WLAN_SA_QUERY_TR_ID_LEN);
2032
62ae67be 2033 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2034}
2035
2e161f78
JB		 2036static ieee80211_rx_result debug_noinline
2037ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2038{
2039 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2040 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2041
2042 /*
2043 * From here on, look only at management frames.
2044 * Data and control frames are already handled,
2045 * and unknown (reserved) frames are useless.
2046 */
2047 if (rx->skb->len < 24)
2048 return RX_DROP_MONITOR;
2049
2050 if (!ieee80211_is_mgmt(mgmt->frame_control))
2051 return RX_DROP_MONITOR;
2052
554891e6 2053 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2054 return RX_DROP_MONITOR;
2055
2056 if (ieee80211_drop_unencrypted_mgmt(rx))
2057 return RX_DROP_UNUSABLE;
2058
2059 return RX_CONTINUE;
2060}
2061
de1ede7a
JB		 2062static ieee80211_rx_result debug_noinline
2063ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2064{
2065 struct ieee80211_local *local = rx->local;
eb9fb5b8 2066 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2067 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2068 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2069 int len = rx->skb->len;
2070
2071 if (!ieee80211_is_action(mgmt->frame_control))
2072 return RX_CONTINUE;
2073
026331c4
JM		 2074 /* drop too small frames */
2075 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2076 return RX_DROP_UNUSABLE;
de1ede7a 2077
026331c4 2078 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2079 return RX_DROP_UNUSABLE;
de1ede7a 2080
554891e6 2081 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2082 return RX_DROP_UNUSABLE;
97ebe12a 2083
de1ede7a
JB		 2084 switch (mgmt->u.action.category) {
2085 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2086 /*
2087 * The aggregation code is not prepared to handle
2088 * anything but STA/AP due to the BSSID handling;
2089 * IBSS could work in the code but isn't supported
2090 * by drivers or the standard.
2091 */
2092 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2093 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2094 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2095 break;
8abd3f9b 2096
026331c4
JM		 2097 /* verify action_code is present */
2098 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2099 break;
2100
de1ede7a
JB		 2101 switch (mgmt->u.action.u.addba_req.action_code) {
2102 case WLAN_ACTION_ADDBA_REQ:
2103 if (len < (IEEE80211_MIN_ACTION_SIZE +
2104 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2105 goto invalid;
2106 break;
de1ede7a
JB		 2107 case WLAN_ACTION_ADDBA_RESP:
2108 if (len < (IEEE80211_MIN_ACTION_SIZE +
2109 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2110 goto invalid;
2111 break;
de1ede7a
JB		 2112 case WLAN_ACTION_DELBA:
2113 if (len < (IEEE80211_MIN_ACTION_SIZE +
2114 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2115 goto invalid;
2116 break;
2117 default:
2118 goto invalid;
de1ede7a 2119 }
bed7ee6e 2120
8b58ff83 2121 goto queue;
39192c0b
JB		 2122 case WLAN_CATEGORY_SPECTRUM_MGMT:
2123 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2124 break;
46900298
JB		 2125
2126 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2127 break;
46900298 2128
026331c4
JM		 2129 /* verify action_code is present */
2130 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2131 break;
2132
39192c0b
JB		 2133 switch (mgmt->u.action.u.measurement.action_code) {
2134 case WLAN_ACTION_SPCT_MSR_REQ:
2135 if (len < (IEEE80211_MIN_ACTION_SIZE +
2136 sizeof(mgmt->u.action.u.measurement)))
84040805 2137 break;
39192c0b 2138 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2139 goto handled;
c481ec97
S		 2140 case WLAN_ACTION_SPCT_CHL_SWITCH:
2141 if (len < (IEEE80211_MIN_ACTION_SIZE +
2142 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2143 break;
c481ec97 2144
cc32abd4 2145 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2146 break;
cc32abd4 2147
46900298 2148 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2149 break;
c481ec97 2150
8b58ff83 2151 goto queue;
39192c0b
JB		 2152 }
2153 break;
fea14732
JM		 2154 case WLAN_CATEGORY_SA_QUERY:
2155 if (len < (IEEE80211_MIN_ACTION_SIZE +
2156 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2157 break;
2158
fea14732
JM		 2159 switch (mgmt->u.action.u.sa_query.action) {
2160 case WLAN_ACTION_SA_QUERY_REQUEST:
2161 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2162 break;
fea14732 2163 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2164 goto handled;
fea14732
JM		 2165 }
2166 break;
97ad9139 2167 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2168 if (!ieee80211_vif_is_mesh(&sdata->vif))
2169 break;
8b58ff83 2170 goto queue;
c7108a71
JC		 2171 case WLAN_CATEGORY_MESH_PATH_SEL:
2172 if (!mesh_path_sel_is_hwmp(sdata))
2173 break;
2174 goto queue;
84040805 2175 }
026331c4 2176
2e161f78
JB		 2177 return RX_CONTINUE;
2178
bed7ee6e 2179 invalid:
554891e6 2180 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2181 /* will return in the next handlers */
2182 return RX_CONTINUE;
2183
2184 handled:
2185 if (rx->sta)
2186 rx->sta->rx_packets++;
2187 dev_kfree_skb(rx->skb);
2188 return RX_QUEUED;
2189
2190 queue:
2191 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2192 skb_queue_tail(&sdata->skb_queue, rx->skb);
2193 ieee80211_queue_work(&local->hw, &sdata->work);
2194 if (rx->sta)
2195 rx->sta->rx_packets++;
2196 return RX_QUEUED;
2197}
2198
2199static ieee80211_rx_result debug_noinline
2200ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2201{
554891e6 2202 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2203
2204 /* skip known-bad action frames and return them in the next handler */
554891e6 2205 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2206 return RX_CONTINUE;
d7907448 2207
026331c4
JM		 2208 /*
2209 * Getting here means the kernel doesn't know how to handle
2210 * it, but maybe userspace does ... include returned frames
2211 * so userspace can register for those to know whether ones
2212 * it transmitted were processed or returned.
2213 */
026331c4 2214
2e161f78
JB		 2215 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2216 rx->skb->data, rx->skb->len,
2217 GFP_ATOMIC)) {
2218 if (rx->sta)
2219 rx->sta->rx_packets++;
2220 dev_kfree_skb(rx->skb);
2221 return RX_QUEUED;
2222 }
2223
2224
2225 return RX_CONTINUE;
2226}
2227
2228static ieee80211_rx_result debug_noinline
2229ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2230{
2231 struct ieee80211_local *local = rx->local;
2232 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2233 struct sk_buff *nskb;
2234 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2235 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2236
2237 if (!ieee80211_is_action(mgmt->frame_control))
2238 return RX_CONTINUE;
2239
2240 /*
2241 * For AP mode, hostapd is responsible for handling any action
2242 * frames that we didn't handle, including returning unknown
2243 * ones. For all other modes we will return them to the sender,
2244 * setting the 0x80 bit in the action category, as required by
2245 * 802.11-2007 7.3.1.11.
2246 * Newer versions of hostapd shall also use the management frame
2247 * registration mechanisms, but older ones still use cooked
2248 * monitor interfaces so push all frames there.
2249 */
554891e6 2250 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2251 (sdata->vif.type == NL80211_IFTYPE_AP ||
2252 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2253 return RX_DROP_MONITOR;
026331c4 2254
84040805
JB		 2255 /* do not return rejected action frames */
2256 if (mgmt->u.action.category & 0x80)
2257 return RX_DROP_UNUSABLE;
2258
2259 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2260 GFP_ATOMIC);
2261 if (nskb) {
292b4df6 2262 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2263
292b4df6
JL		 2264 nmgmt->u.action.category |= 0x80;
2265 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2266 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2267
2268 memset(nskb->cb, 0, sizeof(nskb->cb));
2269
2270 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2271 }
39192c0b
JB		 2272 dev_kfree_skb(rx->skb);
2273 return RX_QUEUED;
de1ede7a
JB		 2274}
2275
49461622 2276static ieee80211_rx_result debug_noinline
5cf121c3 2277ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2278{
eb9fb5b8 2279 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2280 ieee80211_rx_result rxs;
77a121c3
JB		 2281 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2282 __le16 stype;
571ecf67 2283
af6b6374
JB		 2284 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2285 if (rxs != RX_CONTINUE)
2286 return rxs;
2287
77a121c3 2288 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2289
77a121c3
JB		 2290 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2291 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2292 sdata->vif.type != NL80211_IFTYPE_STATION)
2293 return RX_DROP_MONITOR;
472dbc45 2294
77a121c3
JB		 2295 switch (stype) {
2296 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2297 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2298 /* process for all: mesh, mlme, ibss */
2299 break;
2300 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2301 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2302 if (is_multicast_ether_addr(mgmt->da) &&
2303 !is_broadcast_ether_addr(mgmt->da))
2304 return RX_DROP_MONITOR;
2305
77a121c3
JB		 2306 /* process only for station */
2307 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2308 return RX_DROP_MONITOR;
2309 break;
2310 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2311 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2312 /* process only for ibss */
2313 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2314 return RX_DROP_MONITOR;
2315 break;
2316 default:
2317 return RX_DROP_MONITOR;
2318 }
f9d540ee 2319
77a121c3 2320 /* queue up frame and kick off work to process it */
c1475ca9 2321 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2322 skb_queue_tail(&sdata->skb_queue, rx->skb);
2323 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2324 if (rx->sta)
2325 rx->sta->rx_packets++;
46900298 2326
77a121c3 2327 return RX_QUEUED;
571ecf67
JB		 2328}
2329
3b8d81e0 2330static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2331 struct ieee80211_rx_data *rx)
571ecf67 2332{
a7767f95
HH		 2333 int keyidx;
2334 unsigned int hdrlen;
571ecf67 2335
a7767f95 2336 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2337 if (rx->skb->len >= hdrlen + 4)
2338 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2339 else
2340 keyidx = -1;
2341
8944b79f 2342 if (!rx->sta) {
aa0daf0e
JB		 2343 /*
2344 * Some hardware seem to generate incorrect Michael MIC
2345 * reports; ignore them to avoid triggering countermeasures.
2346 */
af2ced6a 2347 return;
571ecf67
JB		 2348 }
2349
a7767f95 2350 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2351 return;
571ecf67 2352
05c914fe 2353 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2354 /*
2355 * APs with pairwise keys should never receive Michael MIC
2356 * errors for non-zero keyidx because these are reserved for
2357 * group keys and only the AP is sending real multicast
2358 * frames in the BSS.
2359 */
af2ced6a 2360 return;
571ecf67
JB		 2361 }
2362
a7767f95
HH		 2363 if (!ieee80211_is_data(hdr->frame_control) &&
2364 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2365 return;
571ecf67 2366
e6d6e342
JB		 2367 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2368 GFP_ATOMIC);
571ecf67
JB		 2369}
2370
5cf121c3 2371/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2372static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2373 struct ieee80211_rate *rate)
3d30d949
MW		 2374{
2375 struct ieee80211_sub_if_data *sdata;
2376 struct ieee80211_local *local = rx->local;
2377 struct ieee80211_rtap_hdr {
2378 struct ieee80211_radiotap_header hdr;
2379 u8 flags;
5f0b7de5 2380 u8 rate_or_pad;
3d30d949
MW		 2381 __le16 chan_freq;
2382 __le16 chan_flags;
bc10502d 2383 } __packed *rthdr;
3d30d949
MW		 2384 struct sk_buff *skb = rx->skb, *skb2;
2385 struct net_device *prev_dev = NULL;
eb9fb5b8 2386 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2387
554891e6
JB		 2388 /*
2389 * If cooked monitor has been processed already, then
2390 * don't do it again. If not, set the flag.
2391 */
2392 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2393 goto out_free_skb;
554891e6 2394 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2395
3d30d949
MW		 2396 if (skb_headroom(skb) < sizeof(*rthdr) &&
2397 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2398 goto out_free_skb;
2399
2400 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2401 memset(rthdr, 0, sizeof(*rthdr));
2402 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2403 rthdr->hdr.it_present =
2404 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2405 (1 << IEEE80211_RADIOTAP_CHANNEL));
2406
5f0b7de5
JB		 2407 if (rate) {
2408 rthdr->rate_or_pad = rate->bitrate / 5;
2409 rthdr->hdr.it_present |=
2410 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2411 }
3d30d949
MW		 2412 rthdr->chan_freq = cpu_to_le16(status->freq);
2413
2414 if (status->band == IEEE80211_BAND_5GHZ)
2415 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2416 IEEE80211_CHAN_5GHZ);
2417 else
2418 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2419 IEEE80211_CHAN_2GHZ);
2420
2421 skb_set_mac_header(skb, 0);
2422 skb->ip_summed = CHECKSUM_UNNECESSARY;
2423 skb->pkt_type = PACKET_OTHERHOST;
2424 skb->protocol = htons(ETH_P_802_2);
2425
2426 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2427 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2428 continue;
2429
05c914fe 2430 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2431 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2432 continue;
2433
2434 if (prev_dev) {
2435 skb2 = skb_clone(skb, GFP_ATOMIC);
2436 if (skb2) {
2437 skb2->dev = prev_dev;
5548a8a1 2438 netif_receive_skb(skb2);
3d30d949
MW		 2439 }
2440 }
2441
2442 prev_dev = sdata->dev;
2443 sdata->dev->stats.rx_packets++;
2444 sdata->dev->stats.rx_bytes += skb->len;
2445 }
2446
2447 if (prev_dev) {
2448 skb->dev = prev_dev;
5548a8a1 2449 netif_receive_skb(skb);
554891e6
JB		 2450 return;
2451 }
3d30d949
MW		 2452
2453 out_free_skb:
2454 dev_kfree_skb(skb);
2455}
2456
aa0c8636
CL		 2457static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2458 ieee80211_rx_result res)
2459{
2460 switch (res) {
2461 case RX_DROP_MONITOR:
2462 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2463 if (rx->sta)
2464 rx->sta->rx_dropped++;
2465 /* fall through */
2466 case RX_CONTINUE: {
2467 struct ieee80211_rate *rate = NULL;
2468 struct ieee80211_supported_band *sband;
2469 struct ieee80211_rx_status *status;
2470
2471 status = IEEE80211_SKB_RXCB((rx->skb));
2472
2473 sband = rx->local->hw.wiphy->bands[status->band];
2474 if (!(status->flag & RX_FLAG_HT))
2475 rate = &sband->bitrates[status->rate_idx];
2476
2477 ieee80211_rx_cooked_monitor(rx, rate);
2478 break;
2479 }
2480 case RX_DROP_UNUSABLE:
2481 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2482 if (rx->sta)
2483 rx->sta->rx_dropped++;
2484 dev_kfree_skb(rx->skb);
2485 break;
2486 case RX_QUEUED:
2487 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2488 break;
2489 }
2490}
571ecf67 2491
aa0c8636
CL		 2492static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
2493 struct sk_buff_head *frames)
58905290 2494{
58905290 2495 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2496 struct sk_buff *skb;
8944b79f 2497
e32f85f7
LCC		 2498#define CALL_RXH(rxh) \
2499 do { \
2500 res = rxh(rx); \
2501 if (res != RX_CONTINUE) \
2569a826 2502 goto rxh_next; \
e32f85f7 2503 } while (0);
49461622 2504
aa0c8636 2505 while ((skb = __skb_dequeue(frames))) {
2569a826
JB		 2506 /*
2507 * all the other fields are valid across frames
2508 * that belong to an aMPDU since they are on the
2509 * same TID from the same station
2510 */
2511 rx->skb = skb;
554891e6 2512 rx->flags = 0;
2569a826
JB		 2513
2514 CALL_RXH(ieee80211_rx_h_decrypt)
2515 CALL_RXH(ieee80211_rx_h_check_more_data)
2516 CALL_RXH(ieee80211_rx_h_sta_process)
2517 CALL_RXH(ieee80211_rx_h_defragment)
2518 CALL_RXH(ieee80211_rx_h_ps_poll)
2519 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2520 /* must be after MMIC verify so header is counted in MPDU mic */
2521 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2522 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2523#ifdef CONFIG_MAC80211_MESH
aa0c8636 2524 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2525 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2526#endif
2569a826
JB		 2527 CALL_RXH(ieee80211_rx_h_data)
2528
2529 /* special treatment -- needs the queue */
aa0c8636 2530 res = ieee80211_rx_h_ctrl(rx, frames);
2569a826
JB		 2531 if (res != RX_CONTINUE)
2532 goto rxh_next;
2533
2e161f78 2534 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2535 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2536 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2537 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2538 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2539
aa0c8636
CL		 2540 rxh_next:
2541 ieee80211_rx_handlers_result(rx, res);
2542
49461622 2543#undef CALL_RXH
aa0c8636
CL		 2544 }
2545}
2546
4406c376 2547static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636
CL		 2548{
2549 struct sk_buff_head reorder_release;
2550 ieee80211_rx_result res = RX_DROP_MONITOR;
2551
2552 __skb_queue_head_init(&reorder_release);
2553
aa0c8636
CL		 2554#define CALL_RXH(rxh) \
2555 do { \
2556 res = rxh(rx); \
2557 if (res != RX_CONTINUE) \
2558 goto rxh_next; \
2559 } while (0);
2560
2561 CALL_RXH(ieee80211_rx_h_passive_scan)
2562 CALL_RXH(ieee80211_rx_h_check)
2563
2564 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
2565
2566 ieee80211_rx_handlers(rx, &reorder_release);
2567 return;
49461622 2568
2569a826 2569 rxh_next:
aa0c8636
CL		 2570 ieee80211_rx_handlers_result(rx, res);
2571
2572#undef CALL_RXH
58905290
JB		 2573}
2574
2bff8ebf 2575/*
dd318575
JB		 2576 * This function makes calls into the RX path, therefore
2577 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2578 */
2579void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2580{
2581 struct sk_buff_head frames;
554891e6
JB		 2582 struct ieee80211_rx_data rx = {
2583 .sta = sta,
2584 .sdata = sta->sdata,
2585 .local = sta->local,
2586 .queue = tid,
2587 };
2c15a0cf
CL		 2588 struct tid_ampdu_rx *tid_agg_rx;
2589
2590 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2591 if (!tid_agg_rx)
2592 return;
2bff8ebf
CL		 2593
2594 __skb_queue_head_init(&frames);
2595
2c15a0cf
CL		 2596 spin_lock(&tid_agg_rx->reorder_lock);
2597 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx, &frames);
2598 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf
CL		 2599
2600 ieee80211_rx_handlers(&rx, &frames);
2601}
2602
571ecf67
JB		 2603/* main receive path */
2604
20b01f80 2605static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2606 struct ieee80211_hdr *hdr)
2607{
20b01f80 2608 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2609 struct sk_buff *skb = rx->skb;
2610 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2611 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2612 int multicast = is_multicast_ether_addr(hdr->addr1);
2613
51fb61e7 2614 switch (sdata->vif.type) {
05c914fe 2615 case NL80211_IFTYPE_STATION:
9bc383de 2616 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2617 return 0;
77fdaa12 2618 if (!multicast &&
47846c9b 2619 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2620 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2621 return 0;
554891e6 2622 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2623 }
2624 break;
05c914fe 2625 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2626 if (!bssid)
2627 return 0;
a7767f95 2628 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2629 return 1;
87291c02 2630 }
46900298 2631 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2632 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2633 return 0;
554891e6 2634 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2635 } else if (!multicast &&
47846c9b 2636 compare_ether_addr(sdata->vif.addr,
23a24def 2637 hdr->addr1) != 0) {
4150c572 2638 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2639 return 0;
554891e6 2640 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2641 } else if (!rx->sta) {
2642 int rate_idx;
eb9fb5b8 2643 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2644 rate_idx = 0; /* TODO: HT rates */
2645 else
eb9fb5b8 2646 rate_idx = status->rate_idx;
34e89507
JB		 2647 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2648 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2649 }
23a24def 2650 break;
05c914fe 2651 case NL80211_IFTYPE_MESH_POINT:
6032f934 2652 if (!multicast &&
47846c9b 2653 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2654 hdr->addr1) != 0) {
2655 if (!(sdata->dev->flags & IFF_PROMISC))
2656 return 0;
2657
554891e6 2658 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2659 }
2660 break;
05c914fe
JB		 2661 case NL80211_IFTYPE_AP_VLAN:
2662 case NL80211_IFTYPE_AP:
23a24def 2663 if (!bssid) {
47846c9b 2664 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2665 hdr->addr1))
2666 return 0;
2667 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2668 sdata->vif.addr)) {
554891e6 2669 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2670 return 0;
554891e6 2671 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2672 }
23a24def 2673 break;
05c914fe 2674 case NL80211_IFTYPE_WDS:
a7767f95 2675 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2676 return 0;
2677 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2678 return 0;
2679 break;
2ca27bcf 2680 default:
fb1c1cd6
JB		 2681 /* should never get here */
2682 WARN_ON(1);
2683 break;
23a24def
JB		 2684 }
2685
2686 return 1;
2687}
2688
4406c376
JB		 2689/*
2690 * This function returns whether or not the SKB
2691 * was destined for RX processing or not, which,
2692 * if consume is true, is equivalent to whether
2693 * or not the skb was consumed.
2694 */
2695static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2696 struct sk_buff *skb, bool consume)
2697{
2698 struct ieee80211_local *local = rx->local;
2699 struct ieee80211_sub_if_data *sdata = rx->sdata;
2700 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2701 struct ieee80211_hdr *hdr = (void *)skb->data;
2702 int prepares;
2703
2704 rx->skb = skb;
554891e6 2705 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2706 prepares = prepare_for_handlers(rx, hdr);
2707
2708 if (!prepares)
2709 return false;
2710
2711 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2712 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2713 ieee80211_rx_michael_mic_report(hdr, rx);
2714 return false;
2715 }
2716
2717 if (!consume) {
2718 skb = skb_copy(skb, GFP_ATOMIC);
2719 if (!skb) {
2720 if (net_ratelimit())
2721 wiphy_debug(local->hw.wiphy,
2722 "failed to copy multicast frame for %s\n",
2723 sdata->name);
2724 return true;
2725 }
2726
2727 rx->skb = skb;
2728 }
2729
2730 ieee80211_invoke_rx_handlers(rx);
2731 return true;
2732}
2733
571ecf67 2734/*
6368e4b1
RR		 2735 * This is the actual Rx frames handler. as it blongs to Rx path it must
2736 * be called with rcu_read_lock protection.
571ecf67 2737 */
71ebb4aa 2738static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2739 struct sk_buff *skb)
571ecf67 2740{
554891e6 2741 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2742 struct ieee80211_local *local = hw_to_local(hw);
2743 struct ieee80211_sub_if_data *sdata;
571ecf67 2744 struct ieee80211_hdr *hdr;
e3cf8b3f 2745 __le16 fc;
5cf121c3 2746 struct ieee80211_rx_data rx;
4406c376 2747 struct ieee80211_sub_if_data *prev;
56af3268 2748 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2749 int err = 0;
571ecf67 2750
e3cf8b3f 2751 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2752 memset(&rx, 0, sizeof(rx));
2753 rx.skb = skb;
2754 rx.local = local;
72abd81b 2755
e3cf8b3f 2756 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2757 local->dot11ReceivedFragmentCount++;
571ecf67 2758
142b9f50
HS		 2759 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2760 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
554891e6 2761 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2762
e3cf8b3f
ZY		 2763 if (ieee80211_is_mgmt(fc))
2764 err = skb_linearize(skb);
2765 else
2766 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2767
2768 if (err) {
2769 dev_kfree_skb(skb);
2770 return;
2771 }
2772
2773 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2774 ieee80211_parse_qos(&rx);
d1c3a37c 2775 ieee80211_verify_alignment(&rx);
38f3714d 2776
e3cf8b3f 2777 if (ieee80211_is_data(fc)) {
56af3268 2778 prev_sta = NULL;
4406c376 2779
abe60632 2780 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2781 if (!prev_sta) {
2782 prev_sta = sta;
2783 continue;
2784 }
2785
2786 rx.sta = prev_sta;
2787 rx.sdata = prev_sta->sdata;
4406c376 2788 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2789
56af3268 2790 prev_sta = sta;
4406c376 2791 }
56af3268
BG		 2792
2793 if (prev_sta) {
2794 rx.sta = prev_sta;
2795 rx.sdata = prev_sta->sdata;
2796
4406c376 2797 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2798 return;
8e26d5ad 2799 goto out;
56af3268 2800 }
4406c376
JB		 2801 }
2802
4b0dd98e 2803 prev = NULL;
b2e7771e 2804
4b0dd98e
JB		 2805 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2806 if (!ieee80211_sdata_running(sdata))
2807 continue;
340e11f3 2808
4b0dd98e
JB		 2809 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2810 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2811 continue;
340e11f3 2812
4b0dd98e
JB		 2813 /*
2814 * frame is destined for this interface, but if it's
2815 * not also for the previous one we handle that after
2816 * the loop to avoid copying the SKB once too much
2817 */
4bb29f8c 2818
4b0dd98e 2819 if (!prev) {
abe60632 2820 prev = sdata;
4b0dd98e 2821 continue;
340e11f3 2822 }
4bb29f8c 2823
4b0dd98e
JB		 2824 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2825 rx.sdata = prev;
2826 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2827
4b0dd98e
JB		 2828 prev = sdata;
2829 }
2830
2831 if (prev) {
2832 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2833 rx.sdata = prev;
4406c376 2834
4b0dd98e
JB		 2835 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2836 return;
571ecf67 2837 }
4406c376 2838
8e26d5ad 2839 out:
4406c376 2840 dev_kfree_skb(skb);
571ecf67 2841}
6368e4b1
RR		 2842
2843/*
2844 * This is the receive path handler. It is called by a low level driver when an
2845 * 802.11 MPDU is received from the hardware.
2846 */
103bf9f7 2847void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2848{
2849 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2850 struct ieee80211_rate *rate = NULL;
2851 struct ieee80211_supported_band *sband;
f1d58c25 2852 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2853
d20ef63d
JB		 2854 WARN_ON_ONCE(softirq_count() == 0);
2855
77a980dc
JB		 2856 if (WARN_ON(status->band < 0 ||
2857 status->band >= IEEE80211_NUM_BANDS))
2858 goto drop;
8318d78a
JB		 2859
2860 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2861 if (WARN_ON(!sband))
2862 goto drop;
8318d78a 2863
89c3a8ac
JB		 2864 /*
2865 * If we're suspending, it is possible although not too likely
2866 * that we'd be receiving frames after having already partially
2867 * quiesced the stack. We can't process such frames then since
2868 * that might, for example, cause stations to be added or other
2869 * driver callbacks be invoked.
2870 */
77a980dc
JB		 2871 if (unlikely(local->quiescing || local->suspended))
2872 goto drop;
89c3a8ac 2873
ea77f12f
JB		 2874 /*
2875 * The same happens when we're not even started,
2876 * but that's worth a warning.
2877 */
77a980dc
JB		 2878 if (WARN_ON(!local->started))
2879 goto drop;
ea77f12f 2880
fc885189 2881 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2882 /*
fc885189
JB		 2883 * Validate the rate, unless a PLCP error means that
2884 * we probably can't have a valid rate here anyway.
e5d6eb83 2885 */
fc885189
JB		 2886
2887 if (status->flag & RX_FLAG_HT) {
2888 /*
2889 * rate_idx is MCS index, which can be [0-76]
2890 * as documented on:
2891 *
2892 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2893 *
2894 * Anything else would be some sort of driver or
2895 * hardware error. The driver should catch hardware
2896 * errors.
2897 */
2898 if (WARN((status->rate_idx < 0 ||
2899 status->rate_idx > 76),
2900 "Rate marked as an HT rate but passed "
2901 "status->rate_idx is not "
2902 "an MCS index [0-76]: %d (0x%02x)\n",
2903 status->rate_idx,
2904 status->rate_idx))
2905 goto drop;
2906 } else {
2907 if (WARN_ON(status->rate_idx < 0 ||
2908 status->rate_idx >= sband->n_bitrates))
2909 goto drop;
2910 rate = &sband->bitrates[status->rate_idx];
2911 }
0fb8ca45 2912 }
6368e4b1 2913
554891e6
JB		 2914 status->rx_flags = 0;
2915
6368e4b1
RR		 2916 /*
2917 * key references and virtual interfaces are protected using RCU
2918 * and this requires that we are in a read-side RCU section during
2919 * receive processing
2920 */
2921 rcu_read_lock();
2922
2923 /*
2924 * Frames with failed FCS/PLCP checksum are not returned,
2925 * all other frames are returned without radiotap header
2926 * if it was previously present.
2927 * Also, frames with less than 16 bytes are dropped.
2928 */
f1d58c25 2929 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2930 if (!skb) {
2931 rcu_read_unlock();
2932 return;
2933 }
2934
071d9ac2 2935 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2936
2937 rcu_read_unlock();
77a980dc
JB		 2938
2939 return;
2940 drop:
2941 kfree_skb(skb);
6368e4b1 2942}
103bf9f7 2943EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2944
2945/* This is a version of the rx handler that can be called from hard irq
2946 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2947void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2948{
2949 struct ieee80211_local *local = hw_to_local(hw);
2950
2951 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2952
571ecf67
JB		 2953 skb->pkt_type = IEEE80211_RX_MSG;
2954 skb_queue_tail(&local->skb_queue, skb);
2955 tasklet_schedule(&local->tasklet);
2956}
2957EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)