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mac80211: allow advertising correct maximum aggregate size
[mirror_ubuntu-artful-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
601ae7f2
BR		 88 return len;
89}
90
d1c3a37c 91/*
601ae7f2
BR		 92 * ieee80211_add_rx_radiotap_header - add radiotap header
93 *
94 * add a radiotap header containing all the fields which the hardware provided.
95 */
96static void
97ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
98 struct sk_buff *skb,
601ae7f2
BR		 99 struct ieee80211_rate *rate,
100 int rtap_len)
101{
f1d58c25 102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 103 struct ieee80211_radiotap_header *rthdr;
104 unsigned char *pos;
6a86b9c7 105 u16 rx_flags = 0;
601ae7f2
BR		 106
107 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
108 memset(rthdr, 0, rtap_len);
109
110 /* radiotap header, set always present flags */
111 rthdr->it_present =
112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 113 (1 << IEEE80211_RADIOTAP_CHANNEL) |
114 (1 << IEEE80211_RADIOTAP_ANTENNA) |
115 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
116 rthdr->it_len = cpu_to_le16(rtap_len);
117
118 pos = (unsigned char *)(rthdr+1);
119
120 /* the order of the following fields is important */
121
122 /* IEEE80211_RADIOTAP_TSFT */
123 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 124 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 125 rthdr->it_present |=
126 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
127 pos += 8;
128 }
129
130 /* IEEE80211_RADIOTAP_FLAGS */
131 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
132 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 133 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
134 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 135 if (status->flag & RX_FLAG_SHORTPRE)
136 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 137 pos++;
138
139 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 140 if (status->flag & RX_FLAG_HT) {
141 /*
142 * TODO: add following information into radiotap header once
143 * suitable fields are defined for it:
144 * - MCS index (status->rate_idx)
145 * - HT40 (status->flag & RX_FLAG_40MHZ)
146 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
147 */
148 *pos = 0;
8d6f658e 149 } else {
ebe6c7ba 150 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 151 *pos = rate->bitrate / 5;
8d6f658e 152 }
601ae7f2
BR		 153 pos++;
154
155 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 156 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 157 pos += 2;
158 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 159 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
160 pos);
5f0b7de5
JB		 161 else if (status->flag & RX_FLAG_HT)
162 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
163 pos);
9deb1ae5 164 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 165 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
166 pos);
601ae7f2 167 else
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2
BR		 170 pos += 2;
171
172 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
173 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
174 *pos = status->signal;
175 rthdr->it_present |=
176 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
177 pos++;
178 }
179
601ae7f2
BR		 180 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
181
182 /* IEEE80211_RADIOTAP_ANTENNA */
183 *pos = status->antenna;
184 pos++;
185
601ae7f2
BR		 186 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
187
188 /* IEEE80211_RADIOTAP_RX_FLAGS */
189 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 190 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 191 pos++;
aae89831 192 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 193 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
194 put_unaligned_le16(rx_flags, pos);
601ae7f2
BR		 195 pos += 2;
196}
197
b2e7771e
JB		 198/*
199 * This function copies a received frame to all monitor interfaces and
200 * returns a cleaned-up SKB that no longer includes the FCS nor the
201 * radiotap header the driver might have added.
202 */
203static struct sk_buff *
204ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 205 struct ieee80211_rate *rate)
b2e7771e 206{
f1d58c25 207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 208 struct ieee80211_sub_if_data *sdata;
b2e7771e 209 int needed_headroom = 0;
b2e7771e
JB		 210 struct sk_buff *skb, *skb2;
211 struct net_device *prev_dev = NULL;
212 int present_fcs_len = 0;
b2e7771e
JB		 213
214 /*
215 * First, we may need to make a copy of the skb because
216 * (1) we need to modify it for radiotap (if not present), and
217 * (2) the other RX handlers will modify the skb we got.
218 *
219 * We don't need to, of course, if we aren't going to return
220 * the SKB because it has a bad FCS/PLCP checksum.
221 */
0869aea0
JB		 222
223 /* room for the radiotap header based on driver features */
224 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 225
226 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
227 present_fcs_len = FCS_LEN;
228
e3cf8b3f
ZY		 229 /* make sure hdr->frame_control is on the linear part */
230 if (!pskb_may_pull(origskb, 2)) {
231 dev_kfree_skb(origskb);
232 return NULL;
233 }
234
b2e7771e 235 if (!local->monitors) {
0869aea0 236 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 237 dev_kfree_skb(origskb);
238 return NULL;
239 }
240
0869aea0 241 return remove_monitor_info(local, origskb);
b2e7771e
JB		 242 }
243
0869aea0 244 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 245 /* only need to expand headroom if necessary */
246 skb = origskb;
247 origskb = NULL;
248
249 /*
250 * This shouldn't trigger often because most devices have an
251 * RX header they pull before we get here, and that should
252 * be big enough for our radiotap information. We should
253 * probably export the length to drivers so that we can have
254 * them allocate enough headroom to start with.
255 */
256 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 257 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 258 dev_kfree_skb(skb);
259 return NULL;
260 }
261 } else {
262 /*
263 * Need to make a copy and possibly remove radiotap header
264 * and FCS from the original.
265 */
266 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
267
0869aea0 268 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 269
270 if (!skb)
271 return origskb;
272 }
273
0869aea0
JB		 274 /* prepend radiotap information */
275 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 276
ce3edf6d 277 skb_reset_mac_header(skb);
b2e7771e
JB		 278 skb->ip_summed = CHECKSUM_UNNECESSARY;
279 skb->pkt_type = PACKET_OTHERHOST;
280 skb->protocol = htons(ETH_P_802_2);
281
282 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 283 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 284 continue;
285
3d30d949
MW		 286 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
287 continue;
288
9607e6b6 289 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 290 continue;
291
b2e7771e
JB		 292 if (prev_dev) {
293 skb2 = skb_clone(skb, GFP_ATOMIC);
294 if (skb2) {
295 skb2->dev = prev_dev;
5548a8a1 296 netif_receive_skb(skb2);
b2e7771e
JB		 297 }
298 }
299
300 prev_dev = sdata->dev;
301 sdata->dev->stats.rx_packets++;
302 sdata->dev->stats.rx_bytes += skb->len;
303 }
304
305 if (prev_dev) {
306 skb->dev = prev_dev;
5548a8a1 307 netif_receive_skb(skb);
b2e7771e
JB		 308 } else
309 dev_kfree_skb(skb);
310
311 return origskb;
312}
313
314
5cf121c3 315static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 316{
238f74a2 317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 318 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 319 int tid;
320
321 /* does the frame have a qos control field? */
238f74a2
HH		 322 if (ieee80211_is_data_qos(hdr->frame_control)) {
323 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 324 /* frame has qos control */
238f74a2
HH		 325 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
326 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 327 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 328 } else {
1411f9b5
JB		 329 /*
330 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
331 *
332 * Sequence numbers for management frames, QoS data
333 * frames with a broadcast/multicast address in the
334 * Address 1 field, and all non-QoS data frames sent
335 * by QoS STAs are assigned using an additional single
336 * modulo-4096 counter, [...]
337 *
338 * We also use that counter for non-QoS STAs.
339 */
340 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 341 }
52865dfd 342
5cf121c3 343 rx->queue = tid;
6e0d114d
JB		 344 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
345 * For now, set skb->priority to 0 for other cases. */
346 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 347}
6e0d114d 348
d1c3a37c
JB		 349/**
350 * DOC: Packet alignment
351 *
352 * Drivers always need to pass packets that are aligned to two-byte boundaries
353 * to the stack.
354 *
355 * Additionally, should, if possible, align the payload data in a way that
356 * guarantees that the contained IP header is aligned to a four-byte
357 * boundary. In the case of regular frames, this simply means aligning the
358 * payload to a four-byte boundary (because either the IP header is directly
359 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 360 * in front of it). If the payload data is not properly aligned and the
361 * architecture doesn't support efficient unaligned operations, mac80211
362 * will align the data.
d1c3a37c
JB		 363 *
364 * With A-MSDU frames, however, the payload data address must yield two modulo
365 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
366 * push the IP header further back to a multiple of four again. Thankfully, the
367 * specs were sane enough this time around to require padding each A-MSDU
368 * subframe to a length that is a multiple of four.
369 *
370 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
371 * the payload is not supported, the driver is required to move the 802.11
372 * header to be directly in front of the payload in that case.
373 */
374static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 375{
59d9cb07
KV		 376#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
377 WARN_ONCE((unsigned long)rx->skb->data & 1,
378 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 379#endif
6e0d114d
JB		 380}
381
6368e4b1 382
571ecf67
JB		 383/* rx handlers */
384
49461622 385static ieee80211_rx_result debug_noinline
5cf121c3 386ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 387{
388 struct ieee80211_local *local = rx->local;
554891e6 389 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 390 struct sk_buff *skb = rx->skb;
391
554891e6 392 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 393 return RX_CONTINUE;
394
395 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
f1d58c25 396 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 397
4080c7cd 398 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
ece8eddd 399 /* drop all the other packets during a software scan anyway */
f1d58c25 400 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 401 dev_kfree_skb(skb);
9ae54c84 402 return RX_QUEUED;
571ecf67
JB		 403 }
404
4080c7cd
JB		 405 /* scanning finished during invoking of handlers */
406 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
407 return RX_DROP_UNUSABLE;
571ecf67
JB		 408}
409
3cfcf6ac
JM		 410
411static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
412{
413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
414
415 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
416 return 0;
417
418 return ieee80211_is_robust_mgmt_frame(hdr);
419}
420
421
422static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
423{
424 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
425
426 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
427 return 0;
428
429 return ieee80211_is_robust_mgmt_frame(hdr);
430}
431
432
433/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
434static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
435{
436 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
437 struct ieee80211_mmie *mmie;
438
439 if (skb->len < 24 + sizeof(*mmie) ||
440 !is_multicast_ether_addr(hdr->da))
441 return -1;
442
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
444 return -1; /* not a robust management frame */
445
446 mmie = (struct ieee80211_mmie *)
447 (skb->data + skb->len - sizeof(*mmie));
448 if (mmie->element_id != WLAN_EID_MMIE ||
449 mmie->length != sizeof(*mmie) - 2)
450 return -1;
451
452 return le16_to_cpu(mmie->key_id);
453}
454
455
33b64eb2 456static ieee80211_rx_result
5cf121c3 457ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 458{
a7767f95
HH		 459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
460 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 461 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 462
a7767f95 463 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 464 if (is_multicast_ether_addr(hdr->addr1)) {
465 if (ieee80211_has_tods(hdr->frame_control) ||
466 !ieee80211_has_fromds(hdr->frame_control))
467 return RX_DROP_MONITOR;
468 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
469 return RX_DROP_MONITOR;
470 } else {
471 if (!ieee80211_has_a4(hdr->frame_control))
472 return RX_DROP_MONITOR;
473 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
474 return RX_DROP_MONITOR;
475 }
33b64eb2
LCC		 476 }
477
478 /* If there is not an established peer link and this is not a peer link
479 * establisment frame, beacon or probe, drop the frame.
480 */
481
b4e08ea1 482 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 483 struct ieee80211_mgmt *mgmt;
d6d1a5a7 484
a7767f95 485 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 486 return RX_DROP_MONITOR;
487
a7767f95 488 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 489 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 490 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 491 return RX_DROP_MONITOR;
33b64eb2 492 return RX_CONTINUE;
33b64eb2
LCC		 493 }
494
a7767f95
HH		 495 if (ieee80211_is_probe_req(hdr->frame_control) ||
496 ieee80211_is_probe_resp(hdr->frame_control) ||
497 ieee80211_is_beacon(hdr->frame_control))
498 return RX_CONTINUE;
499
500 return RX_DROP_MONITOR;
501
502 }
503
504#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
505
506 if (ieee80211_is_data(hdr->frame_control) &&
507 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 508 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 509 return RX_DROP_MONITOR;
902acc78 510#undef msh_h_get
d6d1a5a7 511
902acc78
JB		 512 return RX_CONTINUE;
513}
33b64eb2 514
1edfb1af
JB		 515#define SEQ_MODULO 0x1000
516#define SEQ_MASK 0xfff
517
518static inline int seq_less(u16 sq1, u16 sq2)
519{
520 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
521}
522
523static inline u16 seq_inc(u16 sq)
524{
525 return (sq + 1) & SEQ_MASK;
526}
527
528static inline u16 seq_sub(u16 sq1, u16 sq2)
529{
530 return (sq1 - sq2) & SEQ_MASK;
531}
532
533
534static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
535 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 536 int index)
1edfb1af 537{
24a8fdad 538 struct ieee80211_local *local = hw_to_local(hw);
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;
24a8fdad 552 skb_queue_tail(&local->rx_skb_queue, 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,
24a8fdad 560 u16 head_seq_num)
1edfb1af
JB		 561{
562 int index;
563
dd318575
JB		 564 lockdep_assert_held(&tid_agg_rx->reorder_lock);
565
1edfb1af
JB		 566 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
567 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
568 tid_agg_rx->buf_size;
24a8fdad 569 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 570 }
571}
572
573/*
574 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
575 * the skb was added to the buffer longer than this time ago, the earlier
576 * frames that have not yet been received are assumed to be lost and the skb
577 * can be released for processing. This may also release other skb's from the
578 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 579 *
580 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 581 */
582#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
583
aa0c8636 584static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 585 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 586{
2bff8ebf 587 int index, j;
aa0c8636 588
dd318575
JB		 589 lockdep_assert_held(&tid_agg_rx->reorder_lock);
590
aa0c8636
CL		 591 /* release the buffer until next missing frame */
592 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
593 tid_agg_rx->buf_size;
594 if (!tid_agg_rx->reorder_buf[index] &&
595 tid_agg_rx->stored_mpdu_num > 1) {
596 /*
597 * No buffers ready to be released, but check whether any
598 * frames in the reorder buffer have timed out.
599 */
aa0c8636
CL		 600 int skipped = 1;
601 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
602 j = (j + 1) % tid_agg_rx->buf_size) {
603 if (!tid_agg_rx->reorder_buf[j]) {
604 skipped++;
605 continue;
606 }
607 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
608 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 609 goto set_release_timer;
aa0c8636
CL		 610
611#ifdef CONFIG_MAC80211_HT_DEBUG
612 if (net_ratelimit())
0fb9a9ec
JP		 613 wiphy_debug(hw->wiphy,
614 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 615#endif
24a8fdad 616 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 617
618 /*
619 * Increment the head seq# also for the skipped slots.
620 */
621 tid_agg_rx->head_seq_num =
622 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
623 skipped = 0;
624 }
625 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 626 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 627 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
628 tid_agg_rx->buf_size;
629 }
2bff8ebf
CL		 630
631 if (tid_agg_rx->stored_mpdu_num) {
632 j = index = seq_sub(tid_agg_rx->head_seq_num,
633 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
634
635 for (; j != (index - 1) % tid_agg_rx->buf_size;
636 j = (j + 1) % tid_agg_rx->buf_size) {
637 if (tid_agg_rx->reorder_buf[j])
638 break;
639 }
640
641 set_release_timer:
642
643 mod_timer(&tid_agg_rx->reorder_timer,
644 tid_agg_rx->reorder_time[j] +
645 HT_RX_REORDER_BUF_TIMEOUT);
646 } else {
647 del_timer(&tid_agg_rx->reorder_timer);
648 }
aa0c8636
CL		 649}
650
1edfb1af
JB		 651/*
652 * As this function belongs to the RX path it must be under
653 * rcu_read_lock protection. It returns false if the frame
654 * can be processed immediately, true if it was consumed.
655 */
656static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
657 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 658 struct sk_buff *skb)
1edfb1af
JB		 659{
660 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
661 u16 sc = le16_to_cpu(hdr->seq_ctrl);
662 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
663 u16 head_seq_num, buf_size;
664 int index;
2bff8ebf 665 bool ret = true;
1edfb1af 666
dd318575
JB		 667 spin_lock(&tid_agg_rx->reorder_lock);
668
1edfb1af
JB		 669 buf_size = tid_agg_rx->buf_size;
670 head_seq_num = tid_agg_rx->head_seq_num;
671
672 /* frame with out of date sequence number */
673 if (seq_less(mpdu_seq_num, head_seq_num)) {
674 dev_kfree_skb(skb);
2bff8ebf 675 goto out;
1edfb1af
JB		 676 }
677
678 /*
679 * If frame the sequence number exceeds our buffering window
680 * size release some previous frames to make room for this one.
681 */
682 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
683 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
684 /* release stored frames up to new head to stack */
24a8fdad 685 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 686 }
687
688 /* Now the new frame is always in the range of the reordering buffer */
689
690 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
691
692 /* check if we already stored this frame */
693 if (tid_agg_rx->reorder_buf[index]) {
694 dev_kfree_skb(skb);
2bff8ebf 695 goto out;
1edfb1af
JB		 696 }
697
698 /*
699 * If the current MPDU is in the right order and nothing else
700 * is stored we can process it directly, no need to buffer it.
701 */
702 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
703 tid_agg_rx->stored_mpdu_num == 0) {
704 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 705 ret = false;
706 goto out;
1edfb1af
JB		 707 }
708
709 /* put the frame in the reordering buffer */
710 tid_agg_rx->reorder_buf[index] = skb;
711 tid_agg_rx->reorder_time[index] = jiffies;
712 tid_agg_rx->stored_mpdu_num++;
24a8fdad 713 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 714
2bff8ebf
CL		 715 out:
716 spin_unlock(&tid_agg_rx->reorder_lock);
717 return ret;
1edfb1af
JB		 718}
719
720/*
721 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
722 * true if the MPDU was buffered, false if it should be processed.
723 */
24a8fdad 724static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 725{
2569a826
JB		 726 struct sk_buff *skb = rx->skb;
727 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 728 struct ieee80211_hw *hw = &local->hw;
729 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 730 struct sta_info *sta = rx->sta;
1edfb1af
JB		 731 struct tid_ampdu_rx *tid_agg_rx;
732 u16 sc;
733 int tid;
734
735 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 736 goto dont_reorder;
1edfb1af
JB		 737
738 /*
739 * filter the QoS data rx stream according to
740 * STA/TID and check if this STA/TID is on aggregation
741 */
742
1edfb1af 743 if (!sta)
2569a826 744 goto dont_reorder;
1edfb1af
JB		 745
746 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
747
a87f736d
JB		 748 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
749 if (!tid_agg_rx)
750 goto dont_reorder;
1edfb1af
JB		 751
752 /* qos null data frames are excluded */
753 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 754 goto dont_reorder;
1edfb1af
JB		 755
756 /* new, potentially un-ordered, ampdu frame - process it */
757
758 /* reset session timer */
759 if (tid_agg_rx->timeout)
760 mod_timer(&tid_agg_rx->session_timer,
761 TU_TO_EXP_TIME(tid_agg_rx->timeout));
762
763 /* if this mpdu is fragmented - terminate rx aggregation session */
764 sc = le16_to_cpu(hdr->seq_ctrl);
765 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 766 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 767 skb_queue_tail(&rx->sdata->skb_queue, skb);
768 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 769 return;
1edfb1af
JB		 770 }
771
a87f736d
JB		 772 /*
773 * No locking needed -- we will only ever process one
774 * RX packet at a time, and thus own tid_agg_rx. All
775 * other code manipulating it needs to (and does) make
776 * sure that we cannot get to it any more before doing
777 * anything with it.
778 */
24a8fdad 779 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 780 return;
781
782 dont_reorder:
24a8fdad 783 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 784}
33b64eb2 785
49461622 786static ieee80211_rx_result debug_noinline
5cf121c3 787ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 788{
a7767f95 789 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 790 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 791
792 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
793 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 794 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 795 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 796 hdr->seq_ctrl)) {
554891e6 797 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 798 rx->local->dot11FrameDuplicateCount++;
799 rx->sta->num_duplicates++;
800 }
e4c26add 801 return RX_DROP_MONITOR;
571ecf67 802 } else
5cf121c3 803 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 804 }
805
571ecf67
JB		 806 if (unlikely(rx->skb->len < 16)) {
807 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 808 return RX_DROP_MONITOR;
571ecf67
JB		 809 }
810
571ecf67
JB		 811 /* Drop disallowed frame classes based on STA auth/assoc state;
812 * IEEE 802.11, Chap 5.5.
813 *
ccd7b362
JB		 814 * mac80211 filters only based on association state, i.e. it drops
815 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 816 * deauth/disassoc frames when needed. In addition, hostapd is
817 * responsible for filtering on both auth and assoc states.
818 */
33b64eb2 819
902acc78 820 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 821 return ieee80211_rx_mesh_check(rx);
33b64eb2 822
a7767f95
HH		 823 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
824 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 825 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 826 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
07346f81 827 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 828 if ((!ieee80211_has_fromds(hdr->frame_control) &&
829 !ieee80211_has_tods(hdr->frame_control) &&
830 ieee80211_is_data(hdr->frame_control)) ||
554891e6 831 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 832 /* Drop IBSS frames and frames for other hosts
833 * silently. */
e4c26add 834 return RX_DROP_MONITOR;
571ecf67
JB		 835 }
836
e4c26add 837 return RX_DROP_MONITOR;
571ecf67
JB		 838 }
839
9ae54c84 840 return RX_CONTINUE;
570bd537
JB		 841}
842
843
49461622 844static ieee80211_rx_result debug_noinline
5cf121c3 845ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 846{
eb9fb5b8
JB		 847 struct sk_buff *skb = rx->skb;
848 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
849 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 850 int keyidx;
851 int hdrlen;
e4c26add 852 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 853 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 854 int mmie_keyidx = -1;
761ab470 855 __le16 fc;
570bd537 856
3017b80b
JB		 857 /*
858 * Key selection 101
859 *
3cfcf6ac 860 * There are four types of keys:
3017b80b 861 * - GTK (group keys)
3cfcf6ac 862 * - IGTK (group keys for management frames)
3017b80b
JB		 863 * - PTK (pairwise keys)
864 * - STK (station-to-station pairwise keys)
865 *
866 * When selecting a key, we have to distinguish between multicast
867 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 868 * use PTKs and STKs while the former always use GTKs and IGTKs.
869 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
870 * unicast frames can also use key indices like GTKs. Hence, if we
871 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 872 *
8dc06a1c
JB		 873 * Note that in a regular BSS, multicast frames are sent by the
874 * AP only, associated stations unicast the frame to the AP first
875 * which then multicasts it on their behalf.
876 *
3017b80b
JB		 877 * There is also a slight problem in IBSS mode: GTKs are negotiated
878 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 879 * The spec seems to expect that one negotiates the same key with
880 * every station but there's no such requirement; VLANs could be
881 * possible.
3017b80b
JB		 882 */
883
3017b80b 884 /*
1990af8d 885 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 886 * addressed to us nor a multicast frame.
887 */
554891e6 888 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 889 return RX_CONTINUE;
3017b80b 890
2569a826
JB		 891 /* start without a key */
892 rx->key = NULL;
893
d4e46a3d 894 if (rx->sta)
e31b8213 895 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 896
761ab470
JB		 897 fc = hdr->frame_control;
898
899 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 900 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
901
e31b8213
JB		 902 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
903 rx->key = sta_ptk;
dc1580dd
JB		 904 if ((status->flag & RX_FLAG_DECRYPTED) &&
905 (status->flag & RX_FLAG_IV_STRIPPED))
906 return RX_CONTINUE;
0c7c10c7 907 /* Skip decryption if the frame is not protected. */
761ab470 908 if (!ieee80211_has_protected(fc))
0c7c10c7 909 return RX_CONTINUE;
3cfcf6ac
JM		 910 } else if (mmie_keyidx >= 0) {
911 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 912 if ((status->flag & RX_FLAG_DECRYPTED) &&
913 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 914 return RX_CONTINUE;
915
916 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
917 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
918 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 919 if (rx->sta)
920 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
921 if (!rx->key)
922 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 923 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 924 /*
925 * The frame was not protected, so skip decryption. However, we
926 * need to set rx->key if there is a key that could have been
927 * used so that the frame may be dropped if encryption would
928 * have been expected.
929 */
930 struct ieee80211_key *key = NULL;
897bed8b
JB		 931 struct ieee80211_sub_if_data *sdata = rx->sdata;
932 int i;
933
761ab470 934 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 935 is_multicast_ether_addr(hdr->addr1) &&
936 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
937 rx->key = key;
897bed8b
JB		 938 else {
939 if (rx->sta) {
940 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
941 key = rcu_dereference(rx->sta->gtk[i]);
942 if (key)
943 break;
944 }
945 }
946 if (!key) {
947 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
948 key = rcu_dereference(sdata->keys[i]);
949 if (key)
950 break;
951 }
952 }
953 if (key)
954 rx->key = key;
955 }
0c7c10c7 956 return RX_CONTINUE;
571ecf67 957 } else {
39184b15 958 u8 keyid;
3017b80b
JB		 959 /*
960 * The device doesn't give us the IV so we won't be
961 * able to look up the key. That's ok though, we
962 * don't need to decrypt the frame, we just won't
963 * be able to keep statistics accurate.
964 * Except for key threshold notifications, should
965 * we somehow allow the driver to tell us which key
966 * the hardware used if this flag is set?
967 */
eb9fb5b8
JB		 968 if ((status->flag & RX_FLAG_DECRYPTED) &&
969 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 970 return RX_CONTINUE;
3017b80b 971
761ab470 972 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 973
974 if (rx->skb->len < 8 + hdrlen)
e4c26add 975 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 976
977 /*
978 * no need to call ieee80211_wep_get_keyidx,
979 * it verifies a bunch of things we've done already
980 */
39184b15
ZY		 981 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
982 keyidx = keyid >> 6;
3017b80b 983
e31b8213
JB		 984 /* check per-station GTK first, if multicast packet */
985 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
986 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 987
e31b8213
JB		 988 /* if not found, try default key */
989 if (!rx->key) {
990 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
991
992 /*
993 * RSNA-protected unicast frames should always be
994 * sent with pairwise or station-to-station keys,
995 * but for WEP we allow using a key index as well.
996 */
997 if (rx->key &&
998 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
999 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1000 !is_multicast_ether_addr(hdr->addr1))
1001 rx->key = NULL;
1002 }
571ecf67
JB		 1003 }
1004
3017b80b 1005 if (rx->key) {
571ecf67 1006 rx->key->tx_rx_count++;
011bfcc4 1007 /* TODO: add threshold stuff again */
1990af8d 1008 } else {
e4c26add 1009 return RX_DROP_MONITOR;
70f08765
JB		 1010 }
1011
39184b15
ZY		 1012 if (skb_linearize(rx->skb))
1013 return RX_DROP_UNUSABLE;
761ab470 1014 /* the hdr variable is invalid now! */
1990af8d 1015
97359d12
JB		 1016 switch (rx->key->conf.cipher) {
1017 case WLAN_CIPHER_SUITE_WEP40:
1018 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1019 /* Check for weak IVs if possible */
1020 if (rx->sta && ieee80211_is_data(fc) &&
1021 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1022 !(status->flag & RX_FLAG_DECRYPTED)) &&
1023 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1024 rx->sta->wep_weak_iv_count++;
1025
e2f036da
MN		 1026 result = ieee80211_crypto_wep_decrypt(rx);
1027 break;
97359d12 1028 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1029 result = ieee80211_crypto_tkip_decrypt(rx);
1030 break;
97359d12 1031 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1032 result = ieee80211_crypto_ccmp_decrypt(rx);
1033 break;
97359d12 1034 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1035 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1036 break;
3ffc2a90
JB		 1037 default:
1038 /*
1039 * We can reach here only with HW-only algorithms
1040 * but why didn't it decrypt the frame?!
1041 */
1042 return RX_DROP_UNUSABLE;
70f08765
JB		 1043 }
1044
e2f036da 1045 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1046 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1047
1048 return result;
70f08765
JB		 1049}
1050
572e0012
KV		 1051static ieee80211_rx_result debug_noinline
1052ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1053{
1054 struct ieee80211_local *local;
1055 struct ieee80211_hdr *hdr;
1056 struct sk_buff *skb;
1057
1058 local = rx->local;
1059 skb = rx->skb;
1060 hdr = (struct ieee80211_hdr *) skb->data;
1061
1062 if (!local->pspolling)
1063 return RX_CONTINUE;
1064
1065 if (!ieee80211_has_fromds(hdr->frame_control))
1066 /* this is not from AP */
1067 return RX_CONTINUE;
1068
1069 if (!ieee80211_is_data(hdr->frame_control))
1070 return RX_CONTINUE;
1071
1072 if (!ieee80211_has_moredata(hdr->frame_control)) {
1073 /* AP has no more frames buffered for us */
1074 local->pspolling = false;
1075 return RX_CONTINUE;
1076 }
1077
1078 /* more data bit is set, let's request a new frame from the AP */
1079 ieee80211_send_pspoll(local, rx->sdata);
1080
1081 return RX_CONTINUE;
1082}
1083
133b8226 1084static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1085{
133b8226 1086 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1087 struct ieee80211_local *local = sdata->local;
0795af57 1088
3e122be0 1089 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1090 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1091 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1092#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1093 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1094 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1095#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1096}
1097
ff9458d3 1098static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1099{
133b8226 1100 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1101
3e122be0 1102 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1103
571ecf67 1104#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1105 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1106 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1107#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1108
af818581 1109 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1110#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1111 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1112 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1113#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1114 return;
1115 }
1116
1117 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1118}
1119
49461622 1120static ieee80211_rx_result debug_noinline
5cf121c3 1121ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1122{
1123 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1124 struct sk_buff *skb = rx->skb;
1125 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1126 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1127
1128 if (!sta)
9ae54c84 1129 return RX_CONTINUE;
571ecf67 1130
b291ba11
JB		 1131 /*
1132 * Update last_rx only for IBSS packets which are for the current
1133 * BSSID to avoid keeping the current IBSS network alive in cases
1134 * where other STAs start using different BSSID.
1135 */
05c914fe 1136 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1137 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1138 NL80211_IFTYPE_ADHOC);
46900298 1139 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1140 sta->last_rx = jiffies;
b291ba11
JB		 1141 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1142 /*
33b64eb2
LCC		 1143 * Mesh beacons will update last_rx when if they are found to
1144 * match the current local configuration when processed.
571ecf67 1145 */
b291ba11 1146 sta->last_rx = jiffies;
571ecf67
JB		 1147 }
1148
554891e6 1149 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1150 return RX_CONTINUE;
571ecf67 1151
3cf335d5
KV		 1152 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1153 ieee80211_sta_rx_notify(rx->sdata, hdr);
1154
571ecf67
JB		 1155 sta->rx_fragments++;
1156 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1157 sta->last_signal = status->signal;
541a45a1 1158 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1159
72eaa43a
JB		 1160 /*
1161 * Change STA power saving mode only at the end of a frame
1162 * exchange sequence.
1163 */
3e122be0 1164 if (!ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1165 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1166 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1167 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1168 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1169 /*
1170 * Ignore doze->wake transitions that are
1171 * indicated by non-data frames, the standard
1172 * is unclear here, but for example going to
1173 * PS mode and then scanning would cause a
1174 * doze->wake transition for the probe request,
1175 * and that is clearly undesirable.
1176 */
1177 if (ieee80211_is_data(hdr->frame_control) &&
1178 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1179 ap_sta_ps_end(sta);
72eaa43a
JB		 1180 } else {
1181 if (ieee80211_has_pm(hdr->frame_control))
1182 ap_sta_ps_start(sta);
1183 }
571ecf67
JB		 1184 }
1185
22403def
JB		 1186 /*
1187 * Drop (qos-)data::nullfunc frames silently, since they
1188 * are used only to control station power saving mode.
1189 */
1190 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1191 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1192 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1193
1194 /*
1195 * If we receive a 4-addr nullfunc frame from a STA
1196 * that was not moved to a 4-addr STA vlan yet, drop
1197 * the frame to the monitor interface, to make sure
1198 * that hostapd sees it
1199 */
1200 if (ieee80211_has_a4(hdr->frame_control) &&
1201 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1202 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1203 !rx->sdata->u.vlan.sta)))
1204 return RX_DROP_MONITOR;
22403def
JB		 1205 /*
1206 * Update counter and free packet here to avoid
1207 * counting this as a dropped packed.
1208 */
571ecf67
JB		 1209 sta->rx_packets++;
1210 dev_kfree_skb(rx->skb);
9ae54c84 1211 return RX_QUEUED;
571ecf67
JB		 1212 }
1213
9ae54c84 1214 return RX_CONTINUE;
571ecf67
JB		 1215} /* ieee80211_rx_h_sta_process */
1216
571ecf67
JB		 1217static inline struct ieee80211_fragment_entry *
1218ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1219 unsigned int frag, unsigned int seq, int rx_queue,
1220 struct sk_buff **skb)
1221{
1222 struct ieee80211_fragment_entry *entry;
1223 int idx;
1224
1225 idx = sdata->fragment_next;
1226 entry = &sdata->fragments[sdata->fragment_next++];
1227 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1228 sdata->fragment_next = 0;
1229
1230 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1231#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1232 struct ieee80211_hdr *hdr =
1233 (struct ieee80211_hdr *) entry->skb_list.next->data;
1234 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1235 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1236 "addr1=%pM addr2=%pM\n",
47846c9b 1237 sdata->name, idx,
571ecf67 1238 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1239 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1240#endif
571ecf67
JB		 1241 __skb_queue_purge(&entry->skb_list);
1242 }
1243
1244 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1245 *skb = NULL;
1246 entry->first_frag_time = jiffies;
1247 entry->seq = seq;
1248 entry->rx_queue = rx_queue;
1249 entry->last_frag = frag;
1250 entry->ccmp = 0;
1251 entry->extra_len = 0;
1252
1253 return entry;
1254}
1255
1256static inline struct ieee80211_fragment_entry *
1257ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1258 unsigned int frag, unsigned int seq,
571ecf67
JB		 1259 int rx_queue, struct ieee80211_hdr *hdr)
1260{
1261 struct ieee80211_fragment_entry *entry;
1262 int i, idx;
1263
1264 idx = sdata->fragment_next;
1265 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1266 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1267
1268 idx--;
1269 if (idx < 0)
1270 idx = IEEE80211_FRAGMENT_MAX - 1;
1271
1272 entry = &sdata->fragments[idx];
1273 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1274 entry->rx_queue != rx_queue ||
1275 entry->last_frag + 1 != frag)
1276 continue;
1277
b73d70ad 1278 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1279
b73d70ad
HH		 1280 /*
1281 * Check ftype and addresses are equal, else check next fragment
1282 */
1283 if (((hdr->frame_control ^ f_hdr->frame_control) &
1284 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1285 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1286 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1287 continue;
1288
ab46623e 1289 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1290 __skb_queue_purge(&entry->skb_list);
1291 continue;
1292 }
1293 return entry;
1294 }
1295
1296 return NULL;
1297}
1298
49461622 1299static ieee80211_rx_result debug_noinline
5cf121c3 1300ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1301{
1302 struct ieee80211_hdr *hdr;
1303 u16 sc;
358c8d9d 1304 __le16 fc;
571ecf67
JB		 1305 unsigned int frag, seq;
1306 struct ieee80211_fragment_entry *entry;
1307 struct sk_buff *skb;
554891e6 1308 struct ieee80211_rx_status *status;
571ecf67 1309
b73d70ad 1310 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1311 fc = hdr->frame_control;
571ecf67
JB		 1312 sc = le16_to_cpu(hdr->seq_ctrl);
1313 frag = sc & IEEE80211_SCTL_FRAG;
1314
358c8d9d 1315 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1316 (rx->skb)->len < 24 ||
1317 is_multicast_ether_addr(hdr->addr1))) {
1318 /* not fragmented */
1319 goto out;
1320 }
1321 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1322
e3cf8b3f
ZY		 1323 if (skb_linearize(rx->skb))
1324 return RX_DROP_UNUSABLE;
1325
058897a4
AK		 1326 /*
1327 * skb_linearize() might change the skb->data and
1328 * previously cached variables (in this case, hdr) need to
1329 * be refreshed with the new data.
1330 */
1331 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1332 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1333
1334 if (frag == 0) {
1335 /* This is the first fragment of a new frame. */
1336 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1337 rx->queue, &(rx->skb));
97359d12 1338 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1339 ieee80211_has_protected(fc)) {
9190252c
JM		 1340 int queue = ieee80211_is_mgmt(fc) ?
1341 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1342 /* Store CCMP PN so that we can verify that the next
1343 * fragment has a sequential PN value. */
1344 entry->ccmp = 1;
1345 memcpy(entry->last_pn,
9190252c 1346 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1347 CCMP_PN_LEN);
1348 }
9ae54c84 1349 return RX_QUEUED;
571ecf67
JB		 1350 }
1351
1352 /* This is a fragment for a frame that should already be pending in
1353 * fragment cache. Add this fragment to the end of the pending entry.
1354 */
b73d70ad 1355 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1356 if (!entry) {
1357 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1358 return RX_DROP_MONITOR;
571ecf67
JB		 1359 }
1360
1361 /* Verify that MPDUs within one MSDU have sequential PN values.
1362 * (IEEE 802.11i, 8.3.3.4.5) */
1363 if (entry->ccmp) {
1364 int i;
1365 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1366 int queue;
97359d12 1367 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1368 return RX_DROP_UNUSABLE;
571ecf67
JB		 1369 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1370 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1371 pn[i]++;
1372 if (pn[i])
1373 break;
1374 }
9190252c
JM		 1375 queue = ieee80211_is_mgmt(fc) ?
1376 NUM_RX_DATA_QUEUES : rx->queue;
1377 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1378 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1379 return RX_DROP_UNUSABLE;
571ecf67
JB		 1380 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1381 }
1382
358c8d9d 1383 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1384 __skb_queue_tail(&entry->skb_list, rx->skb);
1385 entry->last_frag = frag;
1386 entry->extra_len += rx->skb->len;
358c8d9d 1387 if (ieee80211_has_morefrags(fc)) {
571ecf67 1388 rx->skb = NULL;
9ae54c84 1389 return RX_QUEUED;
571ecf67
JB		 1390 }
1391
1392 rx->skb = __skb_dequeue(&entry->skb_list);
1393 if (skb_tailroom(rx->skb) < entry->extra_len) {
1394 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1395 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1396 GFP_ATOMIC))) {
1397 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1398 __skb_queue_purge(&entry->skb_list);
e4c26add 1399 return RX_DROP_UNUSABLE;
571ecf67
JB		 1400 }
1401 }
1402 while ((skb = __skb_dequeue(&entry->skb_list))) {
1403 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1404 dev_kfree_skb(skb);
1405 }
1406
1407 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1408 status = IEEE80211_SKB_RXCB(rx->skb);
1409 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1410
1411 out:
1412 if (rx->sta)
1413 rx->sta->rx_packets++;
1414 if (is_multicast_ether_addr(hdr->addr1))
1415 rx->local->dot11MulticastReceivedFrameCount++;
1416 else
1417 ieee80211_led_rx(rx->local);
9ae54c84 1418 return RX_CONTINUE;
571ecf67
JB		 1419}
1420
49461622 1421static ieee80211_rx_result debug_noinline
5cf121c3 1422ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1423{
af818581 1424 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1425 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1426 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1427
358c8d9d 1428 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1429 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1430 return RX_CONTINUE;
571ecf67 1431
05c914fe
JB		 1432 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1433 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1434 return RX_DROP_UNUSABLE;
98f0b0a3 1435
af818581
JB		 1436 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1437 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1438 else
1439 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1440
9ae54c84 1441 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1442 * count as an dropped frame. */
1443 dev_kfree_skb(rx->skb);
1444
9ae54c84 1445 return RX_QUEUED;
571ecf67
JB		 1446}
1447
49461622 1448static ieee80211_rx_result debug_noinline
5cf121c3 1449ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1450{
6e0d114d 1451 u8 *data = rx->skb->data;
238f74a2 1452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1453
238f74a2 1454 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1455 return RX_CONTINUE;
6e0d114d
JB		 1456
1457 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1458 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1459 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1460 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1461 /* change frame type to non QOS */
238f74a2 1462 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1463
9ae54c84 1464 return RX_CONTINUE;
6e0d114d
JB		 1465}
1466
76ee65bf 1467static int
5cf121c3 1468ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1469{
07346f81 1470 if (unlikely(!rx->sta ||
f4ea83dd 1471 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1472 return -EACCES;
571ecf67 1473
76ee65bf 1474 return 0;
571ecf67
JB		 1475}
1476
76ee65bf 1477static int
358c8d9d 1478ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1479{
eb9fb5b8
JB		 1480 struct sk_buff *skb = rx->skb;
1481 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1482
3017b80b 1483 /*
7848ba7d
JB		 1484 * Pass through unencrypted frames if the hardware has
1485 * decrypted them already.
3017b80b 1486 */
eb9fb5b8 1487 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1488 return 0;
571ecf67
JB		 1489
1490 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1491 if (unlikely(!ieee80211_has_protected(fc) &&
1492 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1493 ieee80211_is_data(fc) &&
b3fc9c6c 1494 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1495 return -EACCES;
bef5d1c7
JB		 1496
1497 return 0;
1498}
1499
1500static int
1501ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1502{
1503 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1504 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1505 __le16 fc = hdr->frame_control;
bef5d1c7 1506
e3efca0a
JM		 1507 /*
1508 * Pass through unencrypted frames if the hardware has
1509 * decrypted them already.
1510 */
1511 if (status->flag & RX_FLAG_DECRYPTED)
1512 return 0;
bef5d1c7 1513
f2ca3ea4 1514 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1515 if (unlikely(!ieee80211_has_protected(fc) &&
1516 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1517 rx->key)) {
1518 if (ieee80211_is_deauth(fc))
1519 cfg80211_send_unprot_deauth(rx->sdata->dev,
1520 rx->skb->data,
1521 rx->skb->len);
1522 else if (ieee80211_is_disassoc(fc))
1523 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1524 rx->skb->data,
1525 rx->skb->len);
f2ca3ea4 1526 return -EACCES;
cf4e594e 1527 }
f2ca3ea4 1528 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1529 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1530 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1531 if (ieee80211_is_deauth(fc))
1532 cfg80211_send_unprot_deauth(rx->sdata->dev,
1533 rx->skb->data,
1534 rx->skb->len);
1535 else if (ieee80211_is_disassoc(fc))
1536 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1537 rx->skb->data,
1538 rx->skb->len);
f2ca3ea4 1539 return -EACCES;
cf4e594e 1540 }
f2ca3ea4
JM		 1541 /*
1542 * When using MFP, Action frames are not allowed prior to
1543 * having configured keys.
1544 */
1545 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1546 ieee80211_is_robust_mgmt_frame(
1547 (struct ieee80211_hdr *) rx->skb->data)))
1548 return -EACCES;
1549 }
b3fc9c6c 1550
76ee65bf 1551 return 0;
571ecf67
JB		 1552}
1553
76ee65bf 1554static int
e31a16d6 1555__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1556{
eb9fb5b8 1557 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee
FF		 1558 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1559
9bc383de
JB		 1560 if (ieee80211_has_a4(hdr->frame_control) &&
1561 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1562 return -1;
9bc383de
JB		 1563
1564 if (is_multicast_ether_addr(hdr->addr1) &&
1565 ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) ||
1566 (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr)))
f14543ee 1567 return -1;
571ecf67 1568
47846c9b 1569 return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
76ee65bf 1570}
571ecf67 1571
ce3edf6d
JB		 1572/*
1573 * requires that rx->skb is a frame with ethernet header
1574 */
358c8d9d 1575static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1576{
c97c23e3 1577 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1578 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1579 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1580
1581 /*
1582 * Allow EAPOL frames to us/the PAE group address regardless
1583 * of whether the frame was encrypted or not.
1584 */
a621fa4d 1585 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1586 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1587 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1588 return true;
1589
1590 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1591 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1592 return false;
1593
1594 return true;
1595}
1596
1597/*
1598 * requires that rx->skb is a frame with ethernet header
1599 */
76ee65bf 1600static void
5cf121c3 1601ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1602{
eb9fb5b8
JB		 1603 struct ieee80211_sub_if_data *sdata = rx->sdata;
1604 struct net_device *dev = sdata->dev;
76ee65bf 1605 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1606 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1607 struct sta_info *dsta;
554891e6 1608 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1609
76ee65bf
RR		 1610 skb = rx->skb;
1611 xmit_skb = NULL;
571ecf67 1612
05c914fe
JB		 1613 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1614 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1615 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1616 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1617 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1618 if (is_multicast_ether_addr(ehdr->h_dest)) {
1619 /*
1620 * send multicast frames both to higher layers in
1621 * local net stack and back to the wireless medium
1622 */
76ee65bf
RR		 1623 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1624 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1625 printk(KERN_DEBUG "%s: failed to clone "
1626 "multicast frame\n", dev->name);
1627 } else {
abe60632
JB		 1628 dsta = sta_info_get(sdata, skb->data);
1629 if (dsta) {
ce3edf6d
JB		 1630 /*
1631 * The destination station is associated to
1632 * this AP (in this VLAN), so send the frame
1633 * directly to it and do not pass it to local
1634 * net stack.
571ecf67 1635 */
76ee65bf 1636 xmit_skb = skb;
571ecf67
JB		 1637 skb = NULL;
1638 }
571ecf67
JB		 1639 }
1640 }
1641
1642 if (skb) {
d1c3a37c
JB		 1643 int align __maybe_unused;
1644
59d9cb07 1645#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1646 /*
1647 * 'align' will only take the values 0 or 2 here
1648 * since all frames are required to be aligned
1649 * to 2-byte boundaries when being passed to
1650 * mac80211. That also explains the __skb_push()
1651 * below.
1652 */
dacb6f1d 1653 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1654 if (align) {
1655 if (WARN_ON(skb_headroom(skb) < 3)) {
1656 dev_kfree_skb(skb);
1657 skb = NULL;
1658 } else {
1659 u8 *data = skb->data;
8ce0b589
ZY		 1660 size_t len = skb_headlen(skb);
1661 skb->data -= align;
1662 memmove(skb->data, data, len);
1663 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1664 }
1665 }
1666#endif
1667
1668 if (skb) {
1669 /* deliver to local stack */
1670 skb->protocol = eth_type_trans(skb, dev);
1671 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1672 netif_receive_skb(skb);
d1c3a37c 1673 }
571ecf67
JB		 1674 }
1675
76ee65bf 1676 if (xmit_skb) {
571ecf67 1677 /* send to wireless media */
f831e909 1678 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1679 skb_reset_network_header(xmit_skb);
1680 skb_reset_mac_header(xmit_skb);
76ee65bf 1681 dev_queue_xmit(xmit_skb);
571ecf67 1682 }
76ee65bf
RR		 1683}
1684
49461622 1685static ieee80211_rx_result debug_noinline
5cf121c3 1686ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1687{
eb9fb5b8 1688 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1689 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1690 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1691 __le16 fc = hdr->frame_control;
eaf85ca7 1692 struct sk_buff_head frame_list;
554891e6 1693 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1694
358c8d9d 1695 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1696 return RX_CONTINUE;
fd4c7f2f 1697
358c8d9d 1698 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1699 return RX_DROP_MONITOR;
fd4c7f2f 1700
554891e6 1701 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1702 return RX_CONTINUE;
fd4c7f2f 1703
eaf85ca7
ZY		 1704 if (ieee80211_has_a4(hdr->frame_control) &&
1705 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1706 !rx->sdata->u.vlan.sta)
e4c26add 1707 return RX_DROP_UNUSABLE;
fd4c7f2f 1708
eaf85ca7
ZY		 1709 if (is_multicast_ether_addr(hdr->addr1) &&
1710 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1711 rx->sdata->u.vlan.sta) ||
1712 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1713 rx->sdata->u.mgd.use_4addr)))
e4c26add 1714 return RX_DROP_UNUSABLE;
fd4c7f2f 1715
eaf85ca7
ZY		 1716 skb->dev = dev;
1717 __skb_queue_head_init(&frame_list);
fd4c7f2f 1718
e3cf8b3f
ZY		 1719 if (skb_linearize(skb))
1720 return RX_DROP_UNUSABLE;
1721
eaf85ca7
ZY		 1722 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1723 rx->sdata->vif.type,
1724 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1725
eaf85ca7
ZY		 1726 while (!skb_queue_empty(&frame_list)) {
1727 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1728
358c8d9d 1729 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1730 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1731 continue;
1732 }
eaf85ca7
ZY		 1733 dev->stats.rx_packets++;
1734 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1735
1736 ieee80211_deliver_skb(rx);
1737 }
1738
9ae54c84 1739 return RX_QUEUED;
fd4c7f2f
RR		 1740}
1741
bf94e17b 1742#ifdef CONFIG_MAC80211_MESH
b0dee578 1743static ieee80211_rx_result
e32f85f7
LCC		 1744ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1745{
1746 struct ieee80211_hdr *hdr;
1747 struct ieee80211s_hdr *mesh_hdr;
1748 unsigned int hdrlen;
1749 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1750 struct ieee80211_local *local = rx->local;
eb9fb5b8 1751 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1752 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1753
1754 hdr = (struct ieee80211_hdr *) skb->data;
1755 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1756 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1757
1758 if (!ieee80211_is_data(hdr->frame_control))
1759 return RX_CONTINUE;
1760
1761 if (!mesh_hdr->ttl)
1762 /* illegal frame */
1763 return RX_DROP_MONITOR;
1764
43b7b314 1765 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1766 struct mesh_path *mppath;
43b7b314
JC		 1767 char *proxied_addr;
1768 char *mpp_addr;
1769
1770 if (is_multicast_ether_addr(hdr->addr1)) {
1771 mpp_addr = hdr->addr3;
1772 proxied_addr = mesh_hdr->eaddr1;
1773 } else {
1774 mpp_addr = hdr->addr4;
1775 proxied_addr = mesh_hdr->eaddr2;
1776 }
79617dee 1777
79617dee 1778 rcu_read_lock();
43b7b314 1779 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1780 if (!mppath) {
43b7b314 1781 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1782 } else {
1783 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1784 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1785 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1786 spin_unlock_bh(&mppath->state_lock);
1787 }
1788 rcu_read_unlock();
1789 }
1790
3c5772a5
JC		 1791 /* Frame has reached destination. Don't forward */
1792 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1793 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1794 return RX_CONTINUE;
1795
1796 mesh_hdr->ttl--;
1797
554891e6 1798 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1799 if (!mesh_hdr->ttl)
472dbc45 1800 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1801 dropped_frames_ttl);
1802 else {
1803 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1804 struct ieee80211_tx_info *info;
1805
e32f85f7
LCC		 1806 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1807
1808 if (!fwd_skb && net_ratelimit())
1809 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1810 sdata->name);
919bbad5 1811 if (!fwd_skb)
b51aff05 1812 goto out;
e32f85f7
LCC		 1813
1814 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1815 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1816 info = IEEE80211_SKB_CB(fwd_skb);
1817 memset(info, 0, sizeof(*info));
1818 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1819 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1820 skb_set_queue_mapping(skb,
1821 ieee80211_select_queue(rx->sdata, fwd_skb));
1822 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1823 if (is_multicast_ether_addr(fwd_hdr->addr1))
1824 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1825 fwded_mcast);
1826 else {
3c5772a5
JC		 1827 int err;
1828 /*
1829 * Save TA to addr1 to send TA a path error if a
1830 * suitable next hop is not found
1831 */
1832 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1833 ETH_ALEN);
3c5772a5 1834 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1835 /* Failed to immediately resolve next hop:
1836 * fwded frame was dropped or will be added
1837 * later to the pending skb queue. */
1838 if (err)
1839 return RX_DROP_MONITOR;
c8a61a7d
DW		 1840
1841 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1842 fwded_unicast);
249b405c
JC		 1843 }
1844 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1845 fwded_frames);
3b8d81e0 1846 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1847 }
1848 }
1849
b51aff05 1850 out:
3c5772a5 1851 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1852 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1853 return RX_CONTINUE;
1854 else
1855 return RX_DROP_MONITOR;
1856}
bf94e17b 1857#endif
e32f85f7 1858
49461622 1859static ieee80211_rx_result debug_noinline
5cf121c3 1860ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1861{
eb9fb5b8 1862 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1863 struct ieee80211_local *local = rx->local;
eb9fb5b8 1864 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1865 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1866 __le16 fc = hdr->frame_control;
ce3edf6d 1867 int err;
76ee65bf 1868
358c8d9d 1869 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1870 return RX_CONTINUE;
76ee65bf 1871
358c8d9d 1872 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1873 return RX_DROP_MONITOR;
76ee65bf 1874
f14543ee
FF		 1875 /*
1876 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1877 * that a 4-addr station can be detected and moved into a separate VLAN
1878 */
1879 if (ieee80211_has_a4(hdr->frame_control) &&
1880 sdata->vif.type == NL80211_IFTYPE_AP)
1881 return RX_DROP_MONITOR;
1882
e31a16d6 1883 err = __ieee80211_data_to_8023(rx);
76ee65bf 1884 if (unlikely(err))
e4c26add 1885 return RX_DROP_UNUSABLE;
76ee65bf 1886
358c8d9d 1887 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1888 return RX_DROP_MONITOR;
ce3edf6d 1889
76ee65bf
RR		 1890 rx->skb->dev = dev;
1891
1892 dev->stats.rx_packets++;
1893 dev->stats.rx_bytes += rx->skb->len;
1894
08ca944e
HS		 1895 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1896 !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) {
e15276a4
VN		 1897 mod_timer(&local->dynamic_ps_timer, jiffies +
1898 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1899 }
1900
76ee65bf 1901 ieee80211_deliver_skb(rx);
571ecf67 1902
9ae54c84 1903 return RX_QUEUED;
571ecf67
JB		 1904}
1905
49461622 1906static ieee80211_rx_result debug_noinline
24a8fdad 1907ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1908{
1909 struct ieee80211_local *local = rx->local;
1910 struct ieee80211_hw *hw = &local->hw;
1911 struct sk_buff *skb = rx->skb;
a7767f95 1912 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1913 struct tid_ampdu_rx *tid_agg_rx;
1914 u16 start_seq_num;
1915 u16 tid;
1916
a7767f95 1917 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1918 return RX_CONTINUE;
71364716 1919
a7767f95 1920 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1921 struct {
1922 __le16 control, start_seq_num;
1923 } __packed bar_data;
1924
71364716 1925 if (!rx->sta)
a02ae758 1926 return RX_DROP_MONITOR;
8ae5977f
JB		 1927
1928 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1929 &bar_data, sizeof(bar_data)))
1930 return RX_DROP_MONITOR;
1931
8ae5977f 1932 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1933
1934 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1935 if (!tid_agg_rx)
a02ae758 1936 return RX_DROP_MONITOR;
71364716 1937
8ae5977f 1938 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1939
1940 /* reset session timer */
20ad19d0
JB		 1941 if (tid_agg_rx->timeout)
1942 mod_timer(&tid_agg_rx->session_timer,
1943 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1944
dd318575 1945 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 1946 /* release stored frames up to start of BAR */
24a8fdad 1947 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 1948 spin_unlock(&tid_agg_rx->reorder_lock);
1949
a02ae758
JB		 1950 kfree_skb(skb);
1951 return RX_QUEUED;
71364716
RR		 1952 }
1953
08daecae
JB		 1954 /*
1955 * After this point, we only want management frames,
1956 * so we can drop all remaining control frames to
1957 * cooked monitor interfaces.
1958 */
1959 return RX_DROP_MONITOR;
71364716
RR		 1960}
1961
f4f727a6
JM		 1962static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1963 struct ieee80211_mgmt *mgmt,
1964 size_t len)
fea14732
JM		 1965{
1966 struct ieee80211_local *local = sdata->local;
1967 struct sk_buff *skb;
1968 struct ieee80211_mgmt *resp;
1969
47846c9b 1970 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 1971 /* Not to own unicast address */
1972 return;
1973 }
1974
46900298
JB		 1975 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1976 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1977 /* Not from the current AP or not associated yet. */
fea14732
JM		 1978 return;
1979 }
1980
1981 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1982 /* Too short SA Query request frame */
1983 return;
1984 }
1985
1986 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1987 if (skb == NULL)
1988 return;
1989
1990 skb_reserve(skb, local->hw.extra_tx_headroom);
1991 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1992 memset(resp, 0, 24);
1993 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 1994 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 1995 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1996 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1997 IEEE80211_STYPE_ACTION);
1998 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1999 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2000 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2001 memcpy(resp->u.action.u.sa_query.trans_id,
2002 mgmt->u.action.u.sa_query.trans_id,
2003 WLAN_SA_QUERY_TR_ID_LEN);
2004
62ae67be 2005 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2006}
2007
2e161f78
JB		 2008static ieee80211_rx_result debug_noinline
2009ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2010{
2011 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2012 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2013
2014 /*
2015 * From here on, look only at management frames.
2016 * Data and control frames are already handled,
2017 * and unknown (reserved) frames are useless.
2018 */
2019 if (rx->skb->len < 24)
2020 return RX_DROP_MONITOR;
2021
2022 if (!ieee80211_is_mgmt(mgmt->frame_control))
2023 return RX_DROP_MONITOR;
2024
554891e6 2025 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2026 return RX_DROP_MONITOR;
2027
2028 if (ieee80211_drop_unencrypted_mgmt(rx))
2029 return RX_DROP_UNUSABLE;
2030
2031 return RX_CONTINUE;
2032}
2033
de1ede7a
JB		 2034static ieee80211_rx_result debug_noinline
2035ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2036{
2037 struct ieee80211_local *local = rx->local;
eb9fb5b8 2038 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2039 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2040 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2041 int len = rx->skb->len;
2042
2043 if (!ieee80211_is_action(mgmt->frame_control))
2044 return RX_CONTINUE;
2045
026331c4
JM		 2046 /* drop too small frames */
2047 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2048 return RX_DROP_UNUSABLE;
de1ede7a 2049
026331c4 2050 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2051 return RX_DROP_UNUSABLE;
de1ede7a 2052
554891e6 2053 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2054 return RX_DROP_UNUSABLE;
97ebe12a 2055
de1ede7a
JB		 2056 switch (mgmt->u.action.category) {
2057 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2058 /*
2059 * The aggregation code is not prepared to handle
2060 * anything but STA/AP due to the BSSID handling;
2061 * IBSS could work in the code but isn't supported
2062 * by drivers or the standard.
2063 */
2064 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2065 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2066 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2067 break;
8abd3f9b 2068
026331c4
JM		 2069 /* verify action_code is present */
2070 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2071 break;
2072
de1ede7a
JB		 2073 switch (mgmt->u.action.u.addba_req.action_code) {
2074 case WLAN_ACTION_ADDBA_REQ:
2075 if (len < (IEEE80211_MIN_ACTION_SIZE +
2076 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2077 goto invalid;
2078 break;
de1ede7a
JB		 2079 case WLAN_ACTION_ADDBA_RESP:
2080 if (len < (IEEE80211_MIN_ACTION_SIZE +
2081 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2082 goto invalid;
2083 break;
de1ede7a
JB		 2084 case WLAN_ACTION_DELBA:
2085 if (len < (IEEE80211_MIN_ACTION_SIZE +
2086 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2087 goto invalid;
2088 break;
2089 default:
2090 goto invalid;
de1ede7a 2091 }
bed7ee6e 2092
8b58ff83 2093 goto queue;
39192c0b
JB		 2094 case WLAN_CATEGORY_SPECTRUM_MGMT:
2095 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2096 break;
46900298
JB		 2097
2098 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2099 break;
46900298 2100
026331c4
JM		 2101 /* verify action_code is present */
2102 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2103 break;
2104
39192c0b
JB		 2105 switch (mgmt->u.action.u.measurement.action_code) {
2106 case WLAN_ACTION_SPCT_MSR_REQ:
2107 if (len < (IEEE80211_MIN_ACTION_SIZE +
2108 sizeof(mgmt->u.action.u.measurement)))
84040805 2109 break;
39192c0b 2110 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2111 goto handled;
c481ec97
S		 2112 case WLAN_ACTION_SPCT_CHL_SWITCH:
2113 if (len < (IEEE80211_MIN_ACTION_SIZE +
2114 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2115 break;
c481ec97 2116
cc32abd4 2117 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2118 break;
cc32abd4 2119
46900298 2120 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2121 break;
c481ec97 2122
8b58ff83 2123 goto queue;
39192c0b
JB		 2124 }
2125 break;
fea14732
JM		 2126 case WLAN_CATEGORY_SA_QUERY:
2127 if (len < (IEEE80211_MIN_ACTION_SIZE +
2128 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2129 break;
2130
fea14732
JM		 2131 switch (mgmt->u.action.u.sa_query.action) {
2132 case WLAN_ACTION_SA_QUERY_REQUEST:
2133 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2134 break;
fea14732 2135 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2136 goto handled;
fea14732
JM		 2137 }
2138 break;
97ad9139 2139 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2140 if (!ieee80211_vif_is_mesh(&sdata->vif))
2141 break;
8b58ff83 2142 goto queue;
c7108a71
JC		 2143 case WLAN_CATEGORY_MESH_PATH_SEL:
2144 if (!mesh_path_sel_is_hwmp(sdata))
2145 break;
2146 goto queue;
84040805 2147 }
026331c4 2148
2e161f78
JB		 2149 return RX_CONTINUE;
2150
bed7ee6e 2151 invalid:
554891e6 2152 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2153 /* will return in the next handlers */
2154 return RX_CONTINUE;
2155
2156 handled:
2157 if (rx->sta)
2158 rx->sta->rx_packets++;
2159 dev_kfree_skb(rx->skb);
2160 return RX_QUEUED;
2161
2162 queue:
2163 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2164 skb_queue_tail(&sdata->skb_queue, rx->skb);
2165 ieee80211_queue_work(&local->hw, &sdata->work);
2166 if (rx->sta)
2167 rx->sta->rx_packets++;
2168 return RX_QUEUED;
2169}
2170
2171static ieee80211_rx_result debug_noinline
2172ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2173{
554891e6 2174 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2175
2176 /* skip known-bad action frames and return them in the next handler */
554891e6 2177 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2178 return RX_CONTINUE;
d7907448 2179
026331c4
JM		 2180 /*
2181 * Getting here means the kernel doesn't know how to handle
2182 * it, but maybe userspace does ... include returned frames
2183 * so userspace can register for those to know whether ones
2184 * it transmitted were processed or returned.
2185 */
026331c4 2186
2e161f78
JB		 2187 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2188 rx->skb->data, rx->skb->len,
2189 GFP_ATOMIC)) {
2190 if (rx->sta)
2191 rx->sta->rx_packets++;
2192 dev_kfree_skb(rx->skb);
2193 return RX_QUEUED;
2194 }
2195
2196
2197 return RX_CONTINUE;
2198}
2199
2200static ieee80211_rx_result debug_noinline
2201ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2202{
2203 struct ieee80211_local *local = rx->local;
2204 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2205 struct sk_buff *nskb;
2206 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2207 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2208
2209 if (!ieee80211_is_action(mgmt->frame_control))
2210 return RX_CONTINUE;
2211
2212 /*
2213 * For AP mode, hostapd is responsible for handling any action
2214 * frames that we didn't handle, including returning unknown
2215 * ones. For all other modes we will return them to the sender,
2216 * setting the 0x80 bit in the action category, as required by
2217 * 802.11-2007 7.3.1.11.
2218 * Newer versions of hostapd shall also use the management frame
2219 * registration mechanisms, but older ones still use cooked
2220 * monitor interfaces so push all frames there.
2221 */
554891e6 2222 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2223 (sdata->vif.type == NL80211_IFTYPE_AP ||
2224 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2225 return RX_DROP_MONITOR;
026331c4 2226
84040805
JB		 2227 /* do not return rejected action frames */
2228 if (mgmt->u.action.category & 0x80)
2229 return RX_DROP_UNUSABLE;
2230
2231 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2232 GFP_ATOMIC);
2233 if (nskb) {
292b4df6 2234 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2235
292b4df6
JL		 2236 nmgmt->u.action.category |= 0x80;
2237 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2238 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2239
2240 memset(nskb->cb, 0, sizeof(nskb->cb));
2241
2242 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2243 }
39192c0b
JB		 2244 dev_kfree_skb(rx->skb);
2245 return RX_QUEUED;
de1ede7a
JB		 2246}
2247
49461622 2248static ieee80211_rx_result debug_noinline
5cf121c3 2249ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2250{
eb9fb5b8 2251 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2252 ieee80211_rx_result rxs;
77a121c3
JB		 2253 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2254 __le16 stype;
571ecf67 2255
af6b6374
JB		 2256 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2257 if (rxs != RX_CONTINUE)
2258 return rxs;
2259
77a121c3 2260 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2261
77a121c3
JB		 2262 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2263 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2264 sdata->vif.type != NL80211_IFTYPE_STATION)
2265 return RX_DROP_MONITOR;
472dbc45 2266
77a121c3
JB		 2267 switch (stype) {
2268 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2269 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2270 /* process for all: mesh, mlme, ibss */
2271 break;
2272 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2273 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2274 if (is_multicast_ether_addr(mgmt->da) &&
2275 !is_broadcast_ether_addr(mgmt->da))
2276 return RX_DROP_MONITOR;
2277
77a121c3
JB		 2278 /* process only for station */
2279 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2280 return RX_DROP_MONITOR;
2281 break;
2282 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2283 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2284 /* process only for ibss */
2285 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2286 return RX_DROP_MONITOR;
2287 break;
2288 default:
2289 return RX_DROP_MONITOR;
2290 }
f9d540ee 2291
77a121c3 2292 /* queue up frame and kick off work to process it */
c1475ca9 2293 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2294 skb_queue_tail(&sdata->skb_queue, rx->skb);
2295 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2296 if (rx->sta)
2297 rx->sta->rx_packets++;
46900298 2298
77a121c3 2299 return RX_QUEUED;
571ecf67
JB		 2300}
2301
3b8d81e0 2302static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2303 struct ieee80211_rx_data *rx)
571ecf67 2304{
a7767f95
HH		 2305 int keyidx;
2306 unsigned int hdrlen;
571ecf67 2307
a7767f95 2308 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2309 if (rx->skb->len >= hdrlen + 4)
2310 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2311 else
2312 keyidx = -1;
2313
8944b79f 2314 if (!rx->sta) {
aa0daf0e
JB		 2315 /*
2316 * Some hardware seem to generate incorrect Michael MIC
2317 * reports; ignore them to avoid triggering countermeasures.
2318 */
af2ced6a 2319 return;
571ecf67
JB		 2320 }
2321
a7767f95 2322 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2323 return;
571ecf67 2324
05c914fe 2325 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2326 /*
2327 * APs with pairwise keys should never receive Michael MIC
2328 * errors for non-zero keyidx because these are reserved for
2329 * group keys and only the AP is sending real multicast
2330 * frames in the BSS.
2331 */
af2ced6a 2332 return;
571ecf67
JB		 2333 }
2334
a7767f95
HH		 2335 if (!ieee80211_is_data(hdr->frame_control) &&
2336 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2337 return;
571ecf67 2338
e6d6e342
JB		 2339 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2340 GFP_ATOMIC);
571ecf67
JB		 2341}
2342
5cf121c3 2343/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2344static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2345 struct ieee80211_rate *rate)
3d30d949
MW		 2346{
2347 struct ieee80211_sub_if_data *sdata;
2348 struct ieee80211_local *local = rx->local;
2349 struct ieee80211_rtap_hdr {
2350 struct ieee80211_radiotap_header hdr;
2351 u8 flags;
5f0b7de5 2352 u8 rate_or_pad;
3d30d949
MW		 2353 __le16 chan_freq;
2354 __le16 chan_flags;
bc10502d 2355 } __packed *rthdr;
3d30d949
MW		 2356 struct sk_buff *skb = rx->skb, *skb2;
2357 struct net_device *prev_dev = NULL;
eb9fb5b8 2358 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2359
554891e6
JB		 2360 /*
2361 * If cooked monitor has been processed already, then
2362 * don't do it again. If not, set the flag.
2363 */
2364 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2365 goto out_free_skb;
554891e6 2366 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2367
3d30d949
MW		 2368 if (skb_headroom(skb) < sizeof(*rthdr) &&
2369 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2370 goto out_free_skb;
2371
2372 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2373 memset(rthdr, 0, sizeof(*rthdr));
2374 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2375 rthdr->hdr.it_present =
2376 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2377 (1 << IEEE80211_RADIOTAP_CHANNEL));
2378
5f0b7de5
JB		 2379 if (rate) {
2380 rthdr->rate_or_pad = rate->bitrate / 5;
2381 rthdr->hdr.it_present |=
2382 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2383 }
3d30d949
MW		 2384 rthdr->chan_freq = cpu_to_le16(status->freq);
2385
2386 if (status->band == IEEE80211_BAND_5GHZ)
2387 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2388 IEEE80211_CHAN_5GHZ);
2389 else
2390 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2391 IEEE80211_CHAN_2GHZ);
2392
2393 skb_set_mac_header(skb, 0);
2394 skb->ip_summed = CHECKSUM_UNNECESSARY;
2395 skb->pkt_type = PACKET_OTHERHOST;
2396 skb->protocol = htons(ETH_P_802_2);
2397
2398 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2399 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2400 continue;
2401
05c914fe 2402 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2403 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2404 continue;
2405
2406 if (prev_dev) {
2407 skb2 = skb_clone(skb, GFP_ATOMIC);
2408 if (skb2) {
2409 skb2->dev = prev_dev;
5548a8a1 2410 netif_receive_skb(skb2);
3d30d949
MW		 2411 }
2412 }
2413
2414 prev_dev = sdata->dev;
2415 sdata->dev->stats.rx_packets++;
2416 sdata->dev->stats.rx_bytes += skb->len;
2417 }
2418
2419 if (prev_dev) {
2420 skb->dev = prev_dev;
5548a8a1 2421 netif_receive_skb(skb);
554891e6
JB		 2422 return;
2423 }
3d30d949
MW		 2424
2425 out_free_skb:
2426 dev_kfree_skb(skb);
2427}
2428
aa0c8636
CL		 2429static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2430 ieee80211_rx_result res)
2431{
2432 switch (res) {
2433 case RX_DROP_MONITOR:
2434 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2435 if (rx->sta)
2436 rx->sta->rx_dropped++;
2437 /* fall through */
2438 case RX_CONTINUE: {
2439 struct ieee80211_rate *rate = NULL;
2440 struct ieee80211_supported_band *sband;
2441 struct ieee80211_rx_status *status;
2442
2443 status = IEEE80211_SKB_RXCB((rx->skb));
2444
2445 sband = rx->local->hw.wiphy->bands[status->band];
2446 if (!(status->flag & RX_FLAG_HT))
2447 rate = &sband->bitrates[status->rate_idx];
2448
2449 ieee80211_rx_cooked_monitor(rx, rate);
2450 break;
2451 }
2452 case RX_DROP_UNUSABLE:
2453 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2454 if (rx->sta)
2455 rx->sta->rx_dropped++;
2456 dev_kfree_skb(rx->skb);
2457 break;
2458 case RX_QUEUED:
2459 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2460 break;
2461 }
2462}
571ecf67 2463
24a8fdad 2464static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2465{
58905290 2466 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2467 struct sk_buff *skb;
8944b79f 2468
e32f85f7
LCC		 2469#define CALL_RXH(rxh) \
2470 do { \
2471 res = rxh(rx); \
2472 if (res != RX_CONTINUE) \
2569a826 2473 goto rxh_next; \
e32f85f7 2474 } while (0);
49461622 2475
24a8fdad
CL		 2476 spin_lock(&rx->local->rx_skb_queue.lock);
2477 if (rx->local->running_rx_handler)
2478 goto unlock;
2479
2480 rx->local->running_rx_handler = true;
2481
2482 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2483 spin_unlock(&rx->local->rx_skb_queue.lock);
2484
2569a826
JB		 2485 /*
2486 * all the other fields are valid across frames
2487 * that belong to an aMPDU since they are on the
2488 * same TID from the same station
2489 */
2490 rx->skb = skb;
554891e6 2491 rx->flags = 0;
2569a826
JB		 2492
2493 CALL_RXH(ieee80211_rx_h_decrypt)
2494 CALL_RXH(ieee80211_rx_h_check_more_data)
2495 CALL_RXH(ieee80211_rx_h_sta_process)
2496 CALL_RXH(ieee80211_rx_h_defragment)
2497 CALL_RXH(ieee80211_rx_h_ps_poll)
2498 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2499 /* must be after MMIC verify so header is counted in MPDU mic */
2500 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2501 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2502#ifdef CONFIG_MAC80211_MESH
aa0c8636 2503 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2504 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2505#endif
2569a826 2506 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2507 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2508 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2509 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2510 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2511 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2512 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2513
aa0c8636
CL		 2514 rxh_next:
2515 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2516 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2517#undef CALL_RXH
aa0c8636 2518 }
24a8fdad
CL		 2519
2520 rx->local->running_rx_handler = false;
2521
2522 unlock:
2523 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2524}
2525
4406c376 2526static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2527{
aa0c8636
CL		 2528 ieee80211_rx_result res = RX_DROP_MONITOR;
2529
aa0c8636
CL		 2530#define CALL_RXH(rxh) \
2531 do { \
2532 res = rxh(rx); \
2533 if (res != RX_CONTINUE) \
2534 goto rxh_next; \
2535 } while (0);
2536
2537 CALL_RXH(ieee80211_rx_h_passive_scan)
2538 CALL_RXH(ieee80211_rx_h_check)
2539
24a8fdad 2540 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2541
24a8fdad 2542 ieee80211_rx_handlers(rx);
aa0c8636 2543 return;
49461622 2544
2569a826 2545 rxh_next:
aa0c8636
CL		 2546 ieee80211_rx_handlers_result(rx, res);
2547
2548#undef CALL_RXH
58905290
JB		 2549}
2550
2bff8ebf 2551/*
dd318575
JB		 2552 * This function makes calls into the RX path, therefore
2553 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2554 */
2555void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2556{
554891e6
JB		 2557 struct ieee80211_rx_data rx = {
2558 .sta = sta,
2559 .sdata = sta->sdata,
2560 .local = sta->local,
2561 .queue = tid,
2562 };
2c15a0cf
CL		 2563 struct tid_ampdu_rx *tid_agg_rx;
2564
2565 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2566 if (!tid_agg_rx)
2567 return;
2bff8ebf 2568
2c15a0cf 2569 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2570 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2571 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2572
24a8fdad 2573 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2574}
2575
571ecf67
JB		 2576/* main receive path */
2577
20b01f80 2578static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2579 struct ieee80211_hdr *hdr)
2580{
20b01f80 2581 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2582 struct sk_buff *skb = rx->skb;
2583 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2584 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2585 int multicast = is_multicast_ether_addr(hdr->addr1);
2586
51fb61e7 2587 switch (sdata->vif.type) {
05c914fe 2588 case NL80211_IFTYPE_STATION:
9bc383de 2589 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2590 return 0;
77fdaa12 2591 if (!multicast &&
47846c9b 2592 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2593 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2594 return 0;
554891e6 2595 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2596 }
2597 break;
05c914fe 2598 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2599 if (!bssid)
2600 return 0;
a7767f95 2601 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2602 return 1;
87291c02 2603 }
46900298 2604 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2605 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2606 return 0;
554891e6 2607 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2608 } else if (!multicast &&
47846c9b 2609 compare_ether_addr(sdata->vif.addr,
23a24def 2610 hdr->addr1) != 0) {
4150c572 2611 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2612 return 0;
554891e6 2613 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2614 } else if (!rx->sta) {
2615 int rate_idx;
eb9fb5b8 2616 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2617 rate_idx = 0; /* TODO: HT rates */
2618 else
eb9fb5b8 2619 rate_idx = status->rate_idx;
34e89507
JB		 2620 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2621 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2622 }
23a24def 2623 break;
05c914fe 2624 case NL80211_IFTYPE_MESH_POINT:
6032f934 2625 if (!multicast &&
47846c9b 2626 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2627 hdr->addr1) != 0) {
2628 if (!(sdata->dev->flags & IFF_PROMISC))
2629 return 0;
2630
554891e6 2631 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2632 }
2633 break;
05c914fe
JB		 2634 case NL80211_IFTYPE_AP_VLAN:
2635 case NL80211_IFTYPE_AP:
23a24def 2636 if (!bssid) {
47846c9b 2637 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2638 hdr->addr1))
2639 return 0;
2640 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2641 sdata->vif.addr)) {
554891e6 2642 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2643 return 0;
554891e6 2644 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2645 }
23a24def 2646 break;
05c914fe 2647 case NL80211_IFTYPE_WDS:
a7767f95 2648 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2649 return 0;
2650 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2651 return 0;
2652 break;
2ca27bcf 2653 default:
fb1c1cd6
JB		 2654 /* should never get here */
2655 WARN_ON(1);
2656 break;
23a24def
JB		 2657 }
2658
2659 return 1;
2660}
2661
4406c376
JB		 2662/*
2663 * This function returns whether or not the SKB
2664 * was destined for RX processing or not, which,
2665 * if consume is true, is equivalent to whether
2666 * or not the skb was consumed.
2667 */
2668static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2669 struct sk_buff *skb, bool consume)
2670{
2671 struct ieee80211_local *local = rx->local;
2672 struct ieee80211_sub_if_data *sdata = rx->sdata;
2673 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2674 struct ieee80211_hdr *hdr = (void *)skb->data;
2675 int prepares;
2676
2677 rx->skb = skb;
554891e6 2678 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2679 prepares = prepare_for_handlers(rx, hdr);
2680
2681 if (!prepares)
2682 return false;
2683
2684 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2685 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2686 ieee80211_rx_michael_mic_report(hdr, rx);
2687 return false;
2688 }
2689
2690 if (!consume) {
2691 skb = skb_copy(skb, GFP_ATOMIC);
2692 if (!skb) {
2693 if (net_ratelimit())
2694 wiphy_debug(local->hw.wiphy,
2695 "failed to copy multicast frame for %s\n",
2696 sdata->name);
2697 return true;
2698 }
2699
2700 rx->skb = skb;
2701 }
2702
2703 ieee80211_invoke_rx_handlers(rx);
2704 return true;
2705}
2706
571ecf67 2707/*
6368e4b1
RR		 2708 * This is the actual Rx frames handler. as it blongs to Rx path it must
2709 * be called with rcu_read_lock protection.
571ecf67 2710 */
71ebb4aa 2711static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2712 struct sk_buff *skb)
571ecf67 2713{
554891e6 2714 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2715 struct ieee80211_local *local = hw_to_local(hw);
2716 struct ieee80211_sub_if_data *sdata;
571ecf67 2717 struct ieee80211_hdr *hdr;
e3cf8b3f 2718 __le16 fc;
5cf121c3 2719 struct ieee80211_rx_data rx;
4406c376 2720 struct ieee80211_sub_if_data *prev;
56af3268 2721 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2722 int err = 0;
571ecf67 2723
e3cf8b3f 2724 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2725 memset(&rx, 0, sizeof(rx));
2726 rx.skb = skb;
2727 rx.local = local;
72abd81b 2728
e3cf8b3f 2729 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2730 local->dot11ReceivedFragmentCount++;
571ecf67 2731
142b9f50
HS		 2732 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2733 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
554891e6 2734 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2735
e3cf8b3f
ZY		 2736 if (ieee80211_is_mgmt(fc))
2737 err = skb_linearize(skb);
2738 else
2739 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2740
2741 if (err) {
2742 dev_kfree_skb(skb);
2743 return;
2744 }
2745
2746 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2747 ieee80211_parse_qos(&rx);
d1c3a37c 2748 ieee80211_verify_alignment(&rx);
38f3714d 2749
e3cf8b3f 2750 if (ieee80211_is_data(fc)) {
56af3268 2751 prev_sta = NULL;
4406c376 2752
abe60632 2753 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2754 if (!prev_sta) {
2755 prev_sta = sta;
2756 continue;
2757 }
2758
2759 rx.sta = prev_sta;
2760 rx.sdata = prev_sta->sdata;
4406c376 2761 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2762
56af3268 2763 prev_sta = sta;
4406c376 2764 }
56af3268
BG		 2765
2766 if (prev_sta) {
2767 rx.sta = prev_sta;
2768 rx.sdata = prev_sta->sdata;
2769
4406c376 2770 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2771 return;
8e26d5ad 2772 goto out;
56af3268 2773 }
4406c376
JB		 2774 }
2775
4b0dd98e 2776 prev = NULL;
b2e7771e 2777
4b0dd98e
JB		 2778 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2779 if (!ieee80211_sdata_running(sdata))
2780 continue;
340e11f3 2781
4b0dd98e
JB		 2782 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2783 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2784 continue;
340e11f3 2785
4b0dd98e
JB		 2786 /*
2787 * frame is destined for this interface, but if it's
2788 * not also for the previous one we handle that after
2789 * the loop to avoid copying the SKB once too much
2790 */
4bb29f8c 2791
4b0dd98e 2792 if (!prev) {
abe60632 2793 prev = sdata;
4b0dd98e 2794 continue;
340e11f3 2795 }
4bb29f8c 2796
4b0dd98e
JB		 2797 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2798 rx.sdata = prev;
2799 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2800
4b0dd98e
JB		 2801 prev = sdata;
2802 }
2803
2804 if (prev) {
2805 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2806 rx.sdata = prev;
4406c376 2807
4b0dd98e
JB		 2808 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2809 return;
571ecf67 2810 }
4406c376 2811
8e26d5ad 2812 out:
4406c376 2813 dev_kfree_skb(skb);
571ecf67 2814}
6368e4b1
RR		 2815
2816/*
2817 * This is the receive path handler. It is called by a low level driver when an
2818 * 802.11 MPDU is received from the hardware.
2819 */
103bf9f7 2820void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2821{
2822 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2823 struct ieee80211_rate *rate = NULL;
2824 struct ieee80211_supported_band *sband;
f1d58c25 2825 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2826
d20ef63d
JB		 2827 WARN_ON_ONCE(softirq_count() == 0);
2828
77a980dc
JB		 2829 if (WARN_ON(status->band < 0 ||
2830 status->band >= IEEE80211_NUM_BANDS))
2831 goto drop;
8318d78a
JB		 2832
2833 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2834 if (WARN_ON(!sband))
2835 goto drop;
8318d78a 2836
89c3a8ac
JB		 2837 /*
2838 * If we're suspending, it is possible although not too likely
2839 * that we'd be receiving frames after having already partially
2840 * quiesced the stack. We can't process such frames then since
2841 * that might, for example, cause stations to be added or other
2842 * driver callbacks be invoked.
2843 */
77a980dc
JB		 2844 if (unlikely(local->quiescing || local->suspended))
2845 goto drop;
89c3a8ac 2846
ea77f12f
JB		 2847 /*
2848 * The same happens when we're not even started,
2849 * but that's worth a warning.
2850 */
77a980dc
JB		 2851 if (WARN_ON(!local->started))
2852 goto drop;
ea77f12f 2853
fc885189 2854 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2855 /*
fc885189
JB		 2856 * Validate the rate, unless a PLCP error means that
2857 * we probably can't have a valid rate here anyway.
e5d6eb83 2858 */
fc885189
JB		 2859
2860 if (status->flag & RX_FLAG_HT) {
2861 /*
2862 * rate_idx is MCS index, which can be [0-76]
2863 * as documented on:
2864 *
2865 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2866 *
2867 * Anything else would be some sort of driver or
2868 * hardware error. The driver should catch hardware
2869 * errors.
2870 */
2871 if (WARN((status->rate_idx < 0 ||
2872 status->rate_idx > 76),
2873 "Rate marked as an HT rate but passed "
2874 "status->rate_idx is not "
2875 "an MCS index [0-76]: %d (0x%02x)\n",
2876 status->rate_idx,
2877 status->rate_idx))
2878 goto drop;
2879 } else {
2880 if (WARN_ON(status->rate_idx < 0 ||
2881 status->rate_idx >= sband->n_bitrates))
2882 goto drop;
2883 rate = &sband->bitrates[status->rate_idx];
2884 }
0fb8ca45 2885 }
6368e4b1 2886
554891e6
JB		 2887 status->rx_flags = 0;
2888
6368e4b1
RR		 2889 /*
2890 * key references and virtual interfaces are protected using RCU
2891 * and this requires that we are in a read-side RCU section during
2892 * receive processing
2893 */
2894 rcu_read_lock();
2895
2896 /*
2897 * Frames with failed FCS/PLCP checksum are not returned,
2898 * all other frames are returned without radiotap header
2899 * if it was previously present.
2900 * Also, frames with less than 16 bytes are dropped.
2901 */
f1d58c25 2902 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2903 if (!skb) {
2904 rcu_read_unlock();
2905 return;
2906 }
2907
e1e54068
JB		 2908 ieee80211_tpt_led_trig_rx(local,
2909 ((struct ieee80211_hdr *)skb->data)->frame_control,
2910 skb->len);
071d9ac2 2911 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2912
2913 rcu_read_unlock();
77a980dc
JB		 2914
2915 return;
2916 drop:
2917 kfree_skb(skb);
6368e4b1 2918}
103bf9f7 2919EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2920
2921/* This is a version of the rx handler that can be called from hard irq
2922 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2923void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2924{
2925 struct ieee80211_local *local = hw_to_local(hw);
2926
2927 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2928
571ecf67
JB		 2929 skb->pkt_type = IEEE80211_RX_MSG;
2930 skb_queue_tail(&local->skb_queue, skb);
2931 tasklet_schedule(&local->tasklet);
2932}
2933EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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