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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
bc3b2d7f 19#include <linux/export.h>
571ecf67
JB		 20#include <net/mac80211.h>
21#include <net/ieee80211_radiotap.h>
d26ad377 22#include <asm/unaligned.h>
571ecf67
JB		 23
24#include "ieee80211_i.h"
24487981 25#include "driver-ops.h"
2c8dccc7 26#include "led.h"
33b64eb2 27#include "mesh.h"
571ecf67
JB		 28#include "wep.h"
29#include "wpa.h"
30#include "tkip.h"
31#include "wme.h"
1d8d3dec 32#include "rate.h"
571ecf67 33
b2e7771e
JB		 34/*
35 * monitor mode reception
36 *
37 * This function cleans up the SKB, i.e. it removes all the stuff
38 * only useful for monitoring.
39 */
40static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 41 struct sk_buff *skb)
b2e7771e 42{
b2e7771e
JB		 43 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
44 if (likely(skb->len > FCS_LEN))
e3cf8b3f 45 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 46 else {
47 /* driver bug */
48 WARN_ON(1);
49 dev_kfree_skb(skb);
50 skb = NULL;
51 }
52 }
53
54 return skb;
55}
56
f1d58c25 57static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 58 int present_fcs_len)
b2e7771e 59{
f1d58c25 60 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 61 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 62
63 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
64 return 1;
0869aea0 65 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 66 return 1;
87228f57
HH		 67 if (ieee80211_is_ctl(hdr->frame_control) &&
68 !ieee80211_is_pspoll(hdr->frame_control) &&
69 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 70 return 1;
71 return 0;
72}
73
601ae7f2
BR		 74static int
75ieee80211_rx_radiotap_len(struct ieee80211_local *local,
76 struct ieee80211_rx_status *status)
77{
78 int len;
79
80 /* always present fields */
81 len = sizeof(struct ieee80211_radiotap_header) + 9;
82
6ebacbb7 83 if (status->flag & RX_FLAG_MACTIME_MPDU)
601ae7f2 84 len += 8;
7fee5372 85 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 86 len += 1;
601ae7f2
BR		 87
88 if (len & 1) /* padding for RX_FLAGS if necessary */
89 len++;
90
6d744bac
JB		 91 if (status->flag & RX_FLAG_HT) /* HT info */
92 len += 3;
93
601ae7f2
BR		 94 return len;
95}
96
2c53040f 97/**
601ae7f2
BR		 98 * ieee80211_add_rx_radiotap_header - add radiotap header
99 *
100 * add a radiotap header containing all the fields which the hardware provided.
101 */
102static void
103ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
104 struct sk_buff *skb,
601ae7f2 105 struct ieee80211_rate *rate,
973ef21a 106 int rtap_len, bool has_fcs)
601ae7f2 107{
f1d58c25 108 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 109 struct ieee80211_radiotap_header *rthdr;
110 unsigned char *pos;
6a86b9c7 111 u16 rx_flags = 0;
601ae7f2
BR		 112
113 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
114 memset(rthdr, 0, rtap_len);
115
116 /* radiotap header, set always present flags */
117 rthdr->it_present =
118 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 119 (1 << IEEE80211_RADIOTAP_CHANNEL) |
120 (1 << IEEE80211_RADIOTAP_ANTENNA) |
121 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
122 rthdr->it_len = cpu_to_le16(rtap_len);
123
124 pos = (unsigned char *)(rthdr+1);
125
126 /* the order of the following fields is important */
127
128 /* IEEE80211_RADIOTAP_TSFT */
6ebacbb7 129 if (status->flag & RX_FLAG_MACTIME_MPDU) {
6a86b9c7 130 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 131 rthdr->it_present |=
132 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
133 pos += 8;
134 }
135
136 /* IEEE80211_RADIOTAP_FLAGS */
973ef21a 137 if (has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))
601ae7f2 138 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 139 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
140 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 141 if (status->flag & RX_FLAG_SHORTPRE)
142 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 143 pos++;
144
145 /* IEEE80211_RADIOTAP_RATE */
f8d1ccf1 146 if (!rate || status->flag & RX_FLAG_HT) {
0fb8ca45 147 /*
f8d1ccf1 148 * Without rate information don't add it. If we have,
38f37be2 149 * MCS information is a separate field in radiotap,
73b48099
JB		 150 * added below. The byte here is needed as padding
151 * for the channel though, so initialise it to 0.
0fb8ca45
JM		 152 */
153 *pos = 0;
8d6f658e 154 } else {
ebe6c7ba 155 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 156 *pos = rate->bitrate / 5;
8d6f658e 157 }
601ae7f2
BR		 158 pos++;
159
160 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 161 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 162 pos += 2;
163 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 164 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
165 pos);
5f0b7de5
JB		 166 else if (status->flag & RX_FLAG_HT)
167 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
168 pos);
f8d1ccf1 169 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 170 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
171 pos);
f8d1ccf1 172 else if (rate)
6a86b9c7
JB		 173 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
174 pos);
f8d1ccf1
JB		 175 else
176 put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);
601ae7f2
BR		 177 pos += 2;
178
179 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
fe8431f8
FF		 180 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM &&
181 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
601ae7f2
BR		 182 *pos = status->signal;
183 rthdr->it_present |=
184 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
185 pos++;
186 }
187
601ae7f2
BR		 188 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
189
190 /* IEEE80211_RADIOTAP_ANTENNA */
191 *pos = status->antenna;
192 pos++;
193
601ae7f2
BR		 194 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
195
196 /* IEEE80211_RADIOTAP_RX_FLAGS */
197 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 198 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 199 pos++;
aae89831 200 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 201 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
202 put_unaligned_le16(rx_flags, pos);
601ae7f2 203 pos += 2;
6d744bac
JB		 204
205 if (status->flag & RX_FLAG_HT) {
206 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
ac55d2fe 207 *pos++ = local->hw.radiotap_mcs_details;
6d744bac
JB		 208 *pos = 0;
209 if (status->flag & RX_FLAG_SHORT_GI)
210 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
211 if (status->flag & RX_FLAG_40MHZ)
212 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
ac55d2fe
JB		 213 if (status->flag & RX_FLAG_HT_GF)
214 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
6d744bac
JB		 215 pos++;
216 *pos++ = status->rate_idx;
217 }
601ae7f2
BR		 218}
219
b2e7771e
JB		 220/*
221 * This function copies a received frame to all monitor interfaces and
222 * returns a cleaned-up SKB that no longer includes the FCS nor the
223 * radiotap header the driver might have added.
224 */
225static struct sk_buff *
226ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 227 struct ieee80211_rate *rate)
b2e7771e 228{
f1d58c25 229 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 230 struct ieee80211_sub_if_data *sdata;
293702a3 231 int needed_headroom;
b2e7771e
JB		 232 struct sk_buff *skb, *skb2;
233 struct net_device *prev_dev = NULL;
234 int present_fcs_len = 0;
b2e7771e
JB		 235
236 /*
237 * First, we may need to make a copy of the skb because
238 * (1) we need to modify it for radiotap (if not present), and
239 * (2) the other RX handlers will modify the skb we got.
240 *
241 * We don't need to, of course, if we aren't going to return
242 * the SKB because it has a bad FCS/PLCP checksum.
243 */
0869aea0
JB		 244
245 /* room for the radiotap header based on driver features */
246 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 247
248 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
249 present_fcs_len = FCS_LEN;
250
e3cf8b3f
ZY		 251 /* make sure hdr->frame_control is on the linear part */
252 if (!pskb_may_pull(origskb, 2)) {
253 dev_kfree_skb(origskb);
254 return NULL;
255 }
256
b2e7771e 257 if (!local->monitors) {
0869aea0 258 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 259 dev_kfree_skb(origskb);
260 return NULL;
261 }
262
0869aea0 263 return remove_monitor_info(local, origskb);
b2e7771e
JB		 264 }
265
0869aea0 266 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 267 /* only need to expand headroom if necessary */
268 skb = origskb;
269 origskb = NULL;
270
271 /*
272 * This shouldn't trigger often because most devices have an
273 * RX header they pull before we get here, and that should
274 * be big enough for our radiotap information. We should
275 * probably export the length to drivers so that we can have
276 * them allocate enough headroom to start with.
277 */
278 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 279 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 280 dev_kfree_skb(skb);
281 return NULL;
282 }
283 } else {
284 /*
285 * Need to make a copy and possibly remove radiotap header
286 * and FCS from the original.
287 */
288 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
289
0869aea0 290 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 291
292 if (!skb)
293 return origskb;
294 }
295
0869aea0 296 /* prepend radiotap information */
973ef21a
FF		 297 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
298 true);
b2e7771e 299
ce3edf6d 300 skb_reset_mac_header(skb);
b2e7771e
JB		 301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 skb->pkt_type = PACKET_OTHERHOST;
303 skb->protocol = htons(ETH_P_802_2);
304
305 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 306 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 307 continue;
308
3d30d949
MW		 309 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
310 continue;
311
9607e6b6 312 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 313 continue;
314
b2e7771e
JB		 315 if (prev_dev) {
316 skb2 = skb_clone(skb, GFP_ATOMIC);
317 if (skb2) {
318 skb2->dev = prev_dev;
5548a8a1 319 netif_receive_skb(skb2);
b2e7771e
JB		 320 }
321 }
322
323 prev_dev = sdata->dev;
324 sdata->dev->stats.rx_packets++;
325 sdata->dev->stats.rx_bytes += skb->len;
326 }
327
328 if (prev_dev) {
329 skb->dev = prev_dev;
5548a8a1 330 netif_receive_skb(skb);
b2e7771e
JB		 331 } else
332 dev_kfree_skb(skb);
333
334 return origskb;
335}
336
337
5cf121c3 338static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 339{
238f74a2 340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 341 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
9e26297a 342 int tid, seqno_idx, security_idx;
6e0d114d
JB		 343
344 /* does the frame have a qos control field? */
238f74a2
HH		 345 if (ieee80211_is_data_qos(hdr->frame_control)) {
346 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 347 /* frame has qos control */
238f74a2 348 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
04b7dcf9 349 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
554891e6 350 status->rx_flags |= IEEE80211_RX_AMSDU;
9e26297a
JB		 351
352 seqno_idx = tid;
353 security_idx = tid;
6e0d114d 354 } else {
1411f9b5
JB		 355 /*
356 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
357 *
358 * Sequence numbers for management frames, QoS data
359 * frames with a broadcast/multicast address in the
360 * Address 1 field, and all non-QoS data frames sent
361 * by QoS STAs are assigned using an additional single
362 * modulo-4096 counter, [...]
363 *
364 * We also use that counter for non-QoS STAs.
365 */
9e26297a
JB		 366 seqno_idx = NUM_RX_DATA_QUEUES;
367 security_idx = 0;
368 if (ieee80211_is_mgmt(hdr->frame_control))
369 security_idx = NUM_RX_DATA_QUEUES;
370 tid = 0;
6e0d114d 371 }
52865dfd 372
9e26297a
JB		 373 rx->seqno_idx = seqno_idx;
374 rx->security_idx = security_idx;
6e0d114d
JB		 375 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
376 * For now, set skb->priority to 0 for other cases. */
377 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 378}
6e0d114d 379
d1c3a37c
JB		 380/**
381 * DOC: Packet alignment
382 *
383 * Drivers always need to pass packets that are aligned to two-byte boundaries
384 * to the stack.
385 *
386 * Additionally, should, if possible, align the payload data in a way that
387 * guarantees that the contained IP header is aligned to a four-byte
388 * boundary. In the case of regular frames, this simply means aligning the
389 * payload to a four-byte boundary (because either the IP header is directly
390 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 391 * in front of it). If the payload data is not properly aligned and the
392 * architecture doesn't support efficient unaligned operations, mac80211
393 * will align the data.
d1c3a37c
JB		 394 *
395 * With A-MSDU frames, however, the payload data address must yield two modulo
396 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
397 * push the IP header further back to a multiple of four again. Thankfully, the
398 * specs were sane enough this time around to require padding each A-MSDU
399 * subframe to a length that is a multiple of four.
400 *
25985edc 401 * Padding like Atheros hardware adds which is between the 802.11 header and
d1c3a37c
JB		 402 * the payload is not supported, the driver is required to move the 802.11
403 * header to be directly in front of the payload in that case.
404 */
405static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 406{
59d9cb07
KV		 407#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
408 WARN_ONCE((unsigned long)rx->skb->data & 1,
409 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 410#endif
6e0d114d
JB		 411}
412
6368e4b1 413
571ecf67
JB		 414/* rx handlers */
415
3cfcf6ac
JM		 416static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
417{
418 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
419
420 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
421 return 0;
422
423 return ieee80211_is_robust_mgmt_frame(hdr);
424}
425
426
427static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
428{
429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
430
431 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
432 return 0;
433
434 return ieee80211_is_robust_mgmt_frame(hdr);
435}
436
437
438/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
439static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
440{
441 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
442 struct ieee80211_mmie *mmie;
443
444 if (skb->len < 24 + sizeof(*mmie) ||
445 !is_multicast_ether_addr(hdr->da))
446 return -1;
447
448 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
449 return -1; /* not a robust management frame */
450
451 mmie = (struct ieee80211_mmie *)
452 (skb->data + skb->len - sizeof(*mmie));
453 if (mmie->element_id != WLAN_EID_MMIE ||
454 mmie->length != sizeof(*mmie) - 2)
455 return -1;
456
457 return le16_to_cpu(mmie->key_id);
458}
459
460
33b64eb2 461static ieee80211_rx_result
5cf121c3 462ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 463{
a7767f95 464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
47846c9b 465 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 466
a7767f95 467 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 468 if (is_multicast_ether_addr(hdr->addr1)) {
469 if (ieee80211_has_tods(hdr->frame_control) ||
470 !ieee80211_has_fromds(hdr->frame_control))
471 return RX_DROP_MONITOR;
b203ca39 472 if (ether_addr_equal(hdr->addr3, dev_addr))
3c5772a5
JC		 473 return RX_DROP_MONITOR;
474 } else {
475 if (!ieee80211_has_a4(hdr->frame_control))
476 return RX_DROP_MONITOR;
b203ca39 477 if (ether_addr_equal(hdr->addr4, dev_addr))
3c5772a5
JC		 478 return RX_DROP_MONITOR;
479 }
33b64eb2
LCC		 480 }
481
482 /* If there is not an established peer link and this is not a peer link
483 * establisment frame, beacon or probe, drop the frame.
484 */
485
57cf8043 486 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
33b64eb2 487 struct ieee80211_mgmt *mgmt;
d6d1a5a7 488
a7767f95 489 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 490 return RX_DROP_MONITOR;
491
a7767f95 492 if (ieee80211_is_action(hdr->frame_control)) {
d3aaec8a 493 u8 category;
33b64eb2 494 mgmt = (struct ieee80211_mgmt *)hdr;
d3aaec8a
JC		 495 category = mgmt->u.action.category;
496 if (category != WLAN_CATEGORY_MESH_ACTION &&
497 category != WLAN_CATEGORY_SELF_PROTECTED)
33b64eb2 498 return RX_DROP_MONITOR;
33b64eb2 499 return RX_CONTINUE;
33b64eb2
LCC		 500 }
501
a7767f95
HH		 502 if (ieee80211_is_probe_req(hdr->frame_control) ||
503 ieee80211_is_probe_resp(hdr->frame_control) ||
71839121
JC		 504 ieee80211_is_beacon(hdr->frame_control) ||
505 ieee80211_is_auth(hdr->frame_control))
a7767f95
HH		 506 return RX_CONTINUE;
507
508 return RX_DROP_MONITOR;
509
510 }
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
d3b2fb53 534static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
1edfb1af 535 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 536 int index)
1edfb1af 537{
d3b2fb53 538 struct ieee80211_local *local = sdata->local;
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
d3b2fb53 558static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
1edfb1af 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;
d3b2fb53 569 ieee80211_release_reorder_frame(sdata, 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
d3b2fb53 584static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
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] &&
07ae2dfc 595 tid_agg_rx->stored_mpdu_num) {
aa0c8636
CL		 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 }
499fe9a4
DH		 607 if (skipped &&
608 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
aa0c8636 609 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 610 goto set_release_timer;
aa0c8636 611
bdcbd8e0
JB		 612 ht_dbg_ratelimited(sdata,
613 "release an RX reorder frame due to timeout on earlier frames\n");
d3b2fb53 614 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j);
aa0c8636
CL		 615
616 /*
617 * Increment the head seq# also for the skipped slots.
618 */
619 tid_agg_rx->head_seq_num =
620 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
621 skipped = 0;
622 }
623 } else while (tid_agg_rx->reorder_buf[index]) {
d3b2fb53 624 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index);
aa0c8636
CL		 625 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
626 tid_agg_rx->buf_size;
627 }
2bff8ebf
CL		 628
629 if (tid_agg_rx->stored_mpdu_num) {
630 j = index = seq_sub(tid_agg_rx->head_seq_num,
631 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
632
633 for (; j != (index - 1) % tid_agg_rx->buf_size;
634 j = (j + 1) % tid_agg_rx->buf_size) {
635 if (tid_agg_rx->reorder_buf[j])
636 break;
637 }
638
639 set_release_timer:
640
641 mod_timer(&tid_agg_rx->reorder_timer,
334df731 642 tid_agg_rx->reorder_time[j] + 1 +
2bff8ebf
CL		 643 HT_RX_REORDER_BUF_TIMEOUT);
644 } else {
645 del_timer(&tid_agg_rx->reorder_timer);
646 }
aa0c8636
CL		 647}
648
1edfb1af
JB		 649/*
650 * As this function belongs to the RX path it must be under
651 * rcu_read_lock protection. It returns false if the frame
652 * can be processed immediately, true if it was consumed.
653 */
d3b2fb53 654static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
1edfb1af 655 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 656 struct sk_buff *skb)
1edfb1af
JB		 657{
658 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
659 u16 sc = le16_to_cpu(hdr->seq_ctrl);
660 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
661 u16 head_seq_num, buf_size;
662 int index;
2bff8ebf 663 bool ret = true;
1edfb1af 664
dd318575
JB		 665 spin_lock(&tid_agg_rx->reorder_lock);
666
1edfb1af
JB		 667 buf_size = tid_agg_rx->buf_size;
668 head_seq_num = tid_agg_rx->head_seq_num;
669
670 /* frame with out of date sequence number */
671 if (seq_less(mpdu_seq_num, head_seq_num)) {
672 dev_kfree_skb(skb);
2bff8ebf 673 goto out;
1edfb1af
JB		 674 }
675
676 /*
677 * If frame the sequence number exceeds our buffering window
678 * size release some previous frames to make room for this one.
679 */
680 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
681 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
682 /* release stored frames up to new head to stack */
d3b2fb53
JB		 683 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
684 head_seq_num);
1edfb1af
JB		 685 }
686
687 /* Now the new frame is always in the range of the reordering buffer */
688
689 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
690
691 /* check if we already stored this frame */
692 if (tid_agg_rx->reorder_buf[index]) {
693 dev_kfree_skb(skb);
2bff8ebf 694 goto out;
1edfb1af
JB		 695 }
696
697 /*
698 * If the current MPDU is in the right order and nothing else
699 * is stored we can process it directly, no need to buffer it.
c835b214
JB		 700 * If it is first but there's something stored, we may be able
701 * to release frames after this one.
1edfb1af
JB		 702 */
703 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
704 tid_agg_rx->stored_mpdu_num == 0) {
705 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 706 ret = false;
707 goto out;
1edfb1af
JB		 708 }
709
710 /* put the frame in the reordering buffer */
711 tid_agg_rx->reorder_buf[index] = skb;
712 tid_agg_rx->reorder_time[index] = jiffies;
713 tid_agg_rx->stored_mpdu_num++;
d3b2fb53 714 ieee80211_sta_reorder_release(sdata, tid_agg_rx);
1edfb1af 715
2bff8ebf
CL		 716 out:
717 spin_unlock(&tid_agg_rx->reorder_lock);
718 return ret;
1edfb1af
JB		 719}
720
721/*
722 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
723 * true if the MPDU was buffered, false if it should be processed.
724 */
24a8fdad 725static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 726{
2569a826
JB		 727 struct sk_buff *skb = rx->skb;
728 struct ieee80211_local *local = rx->local;
1edfb1af 729 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
660c6a44 730 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2569a826 731 struct sta_info *sta = rx->sta;
1edfb1af
JB		 732 struct tid_ampdu_rx *tid_agg_rx;
733 u16 sc;
6cc00d54 734 u8 tid, ack_policy;
1edfb1af
JB		 735
736 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 737 goto dont_reorder;
1edfb1af
JB		 738
739 /*
740 * filter the QoS data rx stream according to
741 * STA/TID and check if this STA/TID is on aggregation
742 */
743
1edfb1af 744 if (!sta)
2569a826 745 goto dont_reorder;
1edfb1af 746
6cc00d54
TP		 747 ack_policy = *ieee80211_get_qos_ctl(hdr) &
748 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
1edfb1af
JB		 749 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
750
a87f736d
JB		 751 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
752 if (!tid_agg_rx)
753 goto dont_reorder;
1edfb1af
JB		 754
755 /* qos null data frames are excluded */
756 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 757 goto dont_reorder;
1edfb1af 758
6cc00d54
TP		 759 /* not part of a BA session */
760 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
761 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
762 goto dont_reorder;
763
660c6a44
TP		 764 /* not actually part of this BA session */
765 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
766 goto dont_reorder;
767
1edfb1af
JB		 768 /* new, potentially un-ordered, ampdu frame - process it */
769
770 /* reset session timer */
771 if (tid_agg_rx->timeout)
12d3952f 772 tid_agg_rx->last_rx = jiffies;
1edfb1af
JB		 773
774 /* if this mpdu is fragmented - terminate rx aggregation session */
775 sc = le16_to_cpu(hdr->seq_ctrl);
776 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 777 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 778 skb_queue_tail(&rx->sdata->skb_queue, skb);
779 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 780 return;
1edfb1af
JB		 781 }
782
a87f736d
JB		 783 /*
784 * No locking needed -- we will only ever process one
785 * RX packet at a time, and thus own tid_agg_rx. All
786 * other code manipulating it needs to (and does) make
787 * sure that we cannot get to it any more before doing
788 * anything with it.
789 */
d3b2fb53 790 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb))
2569a826
JB		 791 return;
792
793 dont_reorder:
24a8fdad 794 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 795}
33b64eb2 796
49461622 797static ieee80211_rx_result debug_noinline
5cf121c3 798ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 799{
a7767f95 800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 801 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 802
803 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
804 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 805 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
9e26297a 806 rx->sta->last_seq_ctrl[rx->seqno_idx] ==
571ecf67 807 hdr->seq_ctrl)) {
554891e6 808 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 809 rx->local->dot11FrameDuplicateCount++;
810 rx->sta->num_duplicates++;
811 }
b1f93314 812 return RX_DROP_UNUSABLE;
571ecf67 813 } else
9e26297a 814 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
571ecf67
JB		 815 }
816
571ecf67
JB		 817 if (unlikely(rx->skb->len < 16)) {
818 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 819 return RX_DROP_MONITOR;
571ecf67
JB		 820 }
821
571ecf67
JB		 822 /* Drop disallowed frame classes based on STA auth/assoc state;
823 * IEEE 802.11, Chap 5.5.
824 *
ccd7b362
JB		 825 * mac80211 filters only based on association state, i.e. it drops
826 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 827 * deauth/disassoc frames when needed. In addition, hostapd is
828 * responsible for filtering on both auth and assoc states.
829 */
33b64eb2 830
902acc78 831 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 832 return ieee80211_rx_mesh_check(rx);
33b64eb2 833
a7767f95
HH		 834 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
835 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 836 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 837 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
c2c98fde 838 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
7852e361
JB		 839 /*
840 * accept port control frames from the AP even when it's not
841 * yet marked ASSOC to prevent a race where we don't set the
842 * assoc bit quickly enough before it sends the first frame
843 */
844 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2a33bee2
GE		 845 ieee80211_is_data_present(hdr->frame_control)) {
846 u16 ethertype;
847 u8 *payload;
848
849 payload = rx->skb->data +
850 ieee80211_hdrlen(hdr->frame_control);
851 ethertype = (payload[6] << 8) | payload[7];
852 if (cpu_to_be16(ethertype) ==
853 rx->sdata->control_port_protocol)
854 return RX_CONTINUE;
855 }
21fc7560
JB		 856
857 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
858 cfg80211_rx_spurious_frame(rx->sdata->dev,
859 hdr->addr2,
860 GFP_ATOMIC))
861 return RX_DROP_UNUSABLE;
862
e4c26add 863 return RX_DROP_MONITOR;
2a33bee2 864 }
571ecf67 865
9ae54c84 866 return RX_CONTINUE;
570bd537
JB		 867}
868
869
49461622 870static ieee80211_rx_result debug_noinline
5cf121c3 871ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 872{
eb9fb5b8
JB		 873 struct sk_buff *skb = rx->skb;
874 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
875 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 876 int keyidx;
877 int hdrlen;
e4c26add 878 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 879 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 880 int mmie_keyidx = -1;
761ab470 881 __le16 fc;
570bd537 882
3017b80b
JB		 883 /*
884 * Key selection 101
885 *
3cfcf6ac 886 * There are four types of keys:
3017b80b 887 * - GTK (group keys)
3cfcf6ac 888 * - IGTK (group keys for management frames)
3017b80b
JB		 889 * - PTK (pairwise keys)
890 * - STK (station-to-station pairwise keys)
891 *
892 * When selecting a key, we have to distinguish between multicast
893 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 894 * use PTKs and STKs while the former always use GTKs and IGTKs.
895 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
896 * unicast frames can also use key indices like GTKs. Hence, if we
897 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 898 *
8dc06a1c
JB		 899 * Note that in a regular BSS, multicast frames are sent by the
900 * AP only, associated stations unicast the frame to the AP first
901 * which then multicasts it on their behalf.
902 *
3017b80b
JB		 903 * There is also a slight problem in IBSS mode: GTKs are negotiated
904 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 905 * The spec seems to expect that one negotiates the same key with
906 * every station but there's no such requirement; VLANs could be
907 * possible.
3017b80b
JB		 908 */
909
3017b80b 910 /*
1990af8d 911 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 912 * addressed to us nor a multicast frame.
913 */
554891e6 914 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 915 return RX_CONTINUE;
3017b80b 916
2569a826
JB		 917 /* start without a key */
918 rx->key = NULL;
919
d4e46a3d 920 if (rx->sta)
e31b8213 921 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 922
761ab470
JB		 923 fc = hdr->frame_control;
924
925 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 926 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
927
e31b8213
JB		 928 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
929 rx->key = sta_ptk;
dc1580dd
JB		 930 if ((status->flag & RX_FLAG_DECRYPTED) &&
931 (status->flag & RX_FLAG_IV_STRIPPED))
932 return RX_CONTINUE;
0c7c10c7 933 /* Skip decryption if the frame is not protected. */
761ab470 934 if (!ieee80211_has_protected(fc))
0c7c10c7 935 return RX_CONTINUE;
3cfcf6ac
JM		 936 } else if (mmie_keyidx >= 0) {
937 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 938 if ((status->flag & RX_FLAG_DECRYPTED) &&
939 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 940 return RX_CONTINUE;
941
942 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
943 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
944 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 945 if (rx->sta)
946 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
947 if (!rx->key)
948 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 949 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 950 /*
951 * The frame was not protected, so skip decryption. However, we
952 * need to set rx->key if there is a key that could have been
953 * used so that the frame may be dropped if encryption would
954 * have been expected.
955 */
956 struct ieee80211_key *key = NULL;
897bed8b
JB		 957 struct ieee80211_sub_if_data *sdata = rx->sdata;
958 int i;
959
761ab470 960 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 961 is_multicast_ether_addr(hdr->addr1) &&
962 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
963 rx->key = key;
897bed8b
JB		 964 else {
965 if (rx->sta) {
966 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
967 key = rcu_dereference(rx->sta->gtk[i]);
968 if (key)
969 break;
970 }
971 }
972 if (!key) {
973 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
974 key = rcu_dereference(sdata->keys[i]);
975 if (key)
976 break;
977 }
978 }
979 if (key)
980 rx->key = key;
981 }
0c7c10c7 982 return RX_CONTINUE;
571ecf67 983 } else {
39184b15 984 u8 keyid;
3017b80b
JB		 985 /*
986 * The device doesn't give us the IV so we won't be
987 * able to look up the key. That's ok though, we
988 * don't need to decrypt the frame, we just won't
989 * be able to keep statistics accurate.
990 * Except for key threshold notifications, should
991 * we somehow allow the driver to tell us which key
992 * the hardware used if this flag is set?
993 */
eb9fb5b8
JB		 994 if ((status->flag & RX_FLAG_DECRYPTED) &&
995 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 996 return RX_CONTINUE;
3017b80b 997
761ab470 998 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 999
1000 if (rx->skb->len < 8 + hdrlen)
e4c26add 1001 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 1002
1003 /*
1004 * no need to call ieee80211_wep_get_keyidx,
1005 * it verifies a bunch of things we've done already
1006 */
39184b15
ZY		 1007 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1008 keyidx = keyid >> 6;
3017b80b 1009
e31b8213
JB		 1010 /* check per-station GTK first, if multicast packet */
1011 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1012 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1013
e31b8213
JB		 1014 /* if not found, try default key */
1015 if (!rx->key) {
1016 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1017
1018 /*
1019 * RSNA-protected unicast frames should always be
1020 * sent with pairwise or station-to-station keys,
1021 * but for WEP we allow using a key index as well.
1022 */
1023 if (rx->key &&
1024 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1025 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1026 !is_multicast_ether_addr(hdr->addr1))
1027 rx->key = NULL;
1028 }
571ecf67
JB		 1029 }
1030
3017b80b 1031 if (rx->key) {
95acac61
JB		 1032 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1033 return RX_DROP_MONITOR;
1034
571ecf67 1035 rx->key->tx_rx_count++;
011bfcc4 1036 /* TODO: add threshold stuff again */
1990af8d 1037 } else {
e4c26add 1038 return RX_DROP_MONITOR;
70f08765
JB		 1039 }
1040
97359d12
JB		 1041 switch (rx->key->conf.cipher) {
1042 case WLAN_CIPHER_SUITE_WEP40:
1043 case WLAN_CIPHER_SUITE_WEP104:
e2f036da
MN		 1044 result = ieee80211_crypto_wep_decrypt(rx);
1045 break;
97359d12 1046 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1047 result = ieee80211_crypto_tkip_decrypt(rx);
1048 break;
97359d12 1049 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1050 result = ieee80211_crypto_ccmp_decrypt(rx);
1051 break;
97359d12 1052 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1053 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1054 break;
3ffc2a90
JB		 1055 default:
1056 /*
1057 * We can reach here only with HW-only algorithms
1058 * but why didn't it decrypt the frame?!
1059 */
1060 return RX_DROP_UNUSABLE;
70f08765
JB		 1061 }
1062
a8286911
JB		 1063 /* the hdr variable is invalid after the decrypt handlers */
1064
e2f036da 1065 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1066 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1067
1068 return result;
70f08765
JB		 1069}
1070
572e0012
KV		 1071static ieee80211_rx_result debug_noinline
1072ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1073{
1074 struct ieee80211_local *local;
1075 struct ieee80211_hdr *hdr;
1076 struct sk_buff *skb;
1077
1078 local = rx->local;
1079 skb = rx->skb;
1080 hdr = (struct ieee80211_hdr *) skb->data;
1081
1082 if (!local->pspolling)
1083 return RX_CONTINUE;
1084
1085 if (!ieee80211_has_fromds(hdr->frame_control))
1086 /* this is not from AP */
1087 return RX_CONTINUE;
1088
1089 if (!ieee80211_is_data(hdr->frame_control))
1090 return RX_CONTINUE;
1091
1092 if (!ieee80211_has_moredata(hdr->frame_control)) {
1093 /* AP has no more frames buffered for us */
1094 local->pspolling = false;
1095 return RX_CONTINUE;
1096 }
1097
1098 /* more data bit is set, let's request a new frame from the AP */
1099 ieee80211_send_pspoll(local, rx->sdata);
1100
1101 return RX_CONTINUE;
1102}
1103
133b8226 1104static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1105{
133b8226 1106 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1107 struct ieee80211_local *local = sdata->local;
0795af57 1108
3e122be0 1109 atomic_inc(&sdata->bss->num_sta_ps);
c2c98fde 1110 set_sta_flag(sta, WLAN_STA_PS_STA);
d057e5a3
AN		 1111 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1112 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
bdcbd8e0
JB		 1113 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1114 sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1115}
1116
ff9458d3 1117static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1118{
bdcbd8e0
JB		 1119 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1120 sta->sta.addr, sta->sta.aid);
004c872e 1121
c2c98fde 1122 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
bdcbd8e0
JB		 1123 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1124 sta->sta.addr, sta->sta.aid);
af818581
JB		 1125 return;
1126 }
1127
1128 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1129}
1130
d057e5a3
AN		 1131int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start)
1132{
1133 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta);
1134 bool in_ps;
1135
1136 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS));
1137
1138 /* Don't let the same PS state be set twice */
c2c98fde 1139 in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA);
d057e5a3
AN		 1140 if ((start && in_ps) || (!start && !in_ps))
1141 return -EINVAL;
1142
1143 if (start)
1144 ap_sta_ps_start(sta_inf);
1145 else
1146 ap_sta_ps_end(sta_inf);
1147
1148 return 0;
1149}
1150EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1151
47086fc5
JB		 1152static ieee80211_rx_result debug_noinline
1153ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1154{
1155 struct ieee80211_sub_if_data *sdata = rx->sdata;
1156 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1157 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1158 int tid, ac;
1159
1160 if (!rx->sta || !(status->rx_flags & IEEE80211_RX_RA_MATCH))
1161 return RX_CONTINUE;
1162
1163 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1164 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1165 return RX_CONTINUE;
1166
1167 /*
1168 * The device handles station powersave, so don't do anything about
1169 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1170 * it to mac80211 since they're handled.)
1171 */
1172 if (sdata->local->hw.flags & IEEE80211_HW_AP_LINK_PS)
1173 return RX_CONTINUE;
1174
1175 /*
1176 * Don't do anything if the station isn't already asleep. In
1177 * the uAPSD case, the station will probably be marked asleep,
1178 * in the PS-Poll case the station must be confused ...
1179 */
c2c98fde 1180 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
47086fc5
JB		 1181 return RX_CONTINUE;
1182
1183 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
c2c98fde
JB		 1184 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1185 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
deeaee19
JB		 1186 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1187 else
c2c98fde 1188 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
deeaee19 1189 }
47086fc5
JB		 1190
1191 /* Free PS Poll skb here instead of returning RX_DROP that would
1192 * count as an dropped frame. */
1193 dev_kfree_skb(rx->skb);
1194
1195 return RX_QUEUED;
1196 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1197 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1198 ieee80211_has_pm(hdr->frame_control) &&
1199 (ieee80211_is_data_qos(hdr->frame_control) ||
1200 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1201 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1202 ac = ieee802_1d_to_ac[tid & 7];
1203
1204 /*
1205 * If this AC is not trigger-enabled do nothing.
1206 *
1207 * NB: This could/should check a separate bitmap of trigger-
1208 * enabled queues, but for now we only implement uAPSD w/o
1209 * TSPEC changes to the ACs, so they're always the same.
1210 */
1211 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1212 return RX_CONTINUE;
1213
1214 /* if we are in a service period, do nothing */
c2c98fde 1215 if (test_sta_flag(rx->sta, WLAN_STA_SP))
47086fc5
JB		 1216 return RX_CONTINUE;
1217
c2c98fde 1218 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
47086fc5
JB		 1219 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1220 else
c2c98fde 1221 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
47086fc5
JB		 1222 }
1223
1224 return RX_CONTINUE;
1225}
1226
49461622 1227static ieee80211_rx_result debug_noinline
5cf121c3 1228ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1229{
1230 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1231 struct sk_buff *skb = rx->skb;
1232 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1233 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1234
1235 if (!sta)
9ae54c84 1236 return RX_CONTINUE;
571ecf67 1237
b291ba11
JB		 1238 /*
1239 * Update last_rx only for IBSS packets which are for the current
1240 * BSSID to avoid keeping the current IBSS network alive in cases
1241 * where other STAs start using different BSSID.
1242 */
05c914fe 1243 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1244 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1245 NL80211_IFTYPE_ADHOC);
b203ca39 1246 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid)) {
571ecf67 1247 sta->last_rx = jiffies;
3af6334c
FF		 1248 if (ieee80211_is_data(hdr->frame_control)) {
1249 sta->last_rx_rate_idx = status->rate_idx;
1250 sta->last_rx_rate_flag = status->flag;
1251 }
1252 }
b291ba11
JB		 1253 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1254 /*
33b64eb2
LCC		 1255 * Mesh beacons will update last_rx when if they are found to
1256 * match the current local configuration when processed.
571ecf67 1257 */
b291ba11 1258 sta->last_rx = jiffies;
3af6334c
FF		 1259 if (ieee80211_is_data(hdr->frame_control)) {
1260 sta->last_rx_rate_idx = status->rate_idx;
1261 sta->last_rx_rate_flag = status->flag;
1262 }
571ecf67
JB		 1263 }
1264
554891e6 1265 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1266 return RX_CONTINUE;
571ecf67 1267
3cf335d5
KV		 1268 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1269 ieee80211_sta_rx_notify(rx->sdata, hdr);
1270
571ecf67
JB		 1271 sta->rx_fragments++;
1272 sta->rx_bytes += rx->skb->len;
fe8431f8
FF		 1273 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
1274 sta->last_signal = status->signal;
1275 ewma_add(&sta->avg_signal, -status->signal);
1276 }
571ecf67 1277
72eaa43a
JB		 1278 /*
1279 * Change STA power saving mode only at the end of a frame
1280 * exchange sequence.
1281 */
d057e5a3
AN		 1282 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) &&
1283 !ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1284 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1285 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1286 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
c2c98fde 1287 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1288 /*
1289 * Ignore doze->wake transitions that are
1290 * indicated by non-data frames, the standard
1291 * is unclear here, but for example going to
1292 * PS mode and then scanning would cause a
1293 * doze->wake transition for the probe request,
1294 * and that is clearly undesirable.
1295 */
1296 if (ieee80211_is_data(hdr->frame_control) &&
1297 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1298 ap_sta_ps_end(sta);
72eaa43a
JB		 1299 } else {
1300 if (ieee80211_has_pm(hdr->frame_control))
1301 ap_sta_ps_start(sta);
1302 }
571ecf67
JB		 1303 }
1304
22403def
JB		 1305 /*
1306 * Drop (qos-)data::nullfunc frames silently, since they
1307 * are used only to control station power saving mode.
1308 */
1309 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1310 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1311 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1312
1313 /*
1314 * If we receive a 4-addr nullfunc frame from a STA
e7f4a940
JB		 1315 * that was not moved to a 4-addr STA vlan yet send
1316 * the event to userspace and for older hostapd drop
1317 * the frame to the monitor interface.
d524215f
FF		 1318 */
1319 if (ieee80211_has_a4(hdr->frame_control) &&
1320 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1321 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
e7f4a940
JB		 1322 !rx->sdata->u.vlan.sta))) {
1323 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1324 cfg80211_rx_unexpected_4addr_frame(
1325 rx->sdata->dev, sta->sta.addr,
1326 GFP_ATOMIC);
d524215f 1327 return RX_DROP_MONITOR;
e7f4a940 1328 }
22403def
JB		 1329 /*
1330 * Update counter and free packet here to avoid
1331 * counting this as a dropped packed.
1332 */
571ecf67
JB		 1333 sta->rx_packets++;
1334 dev_kfree_skb(rx->skb);
9ae54c84 1335 return RX_QUEUED;
571ecf67
JB		 1336 }
1337
9ae54c84 1338 return RX_CONTINUE;
571ecf67
JB		 1339} /* ieee80211_rx_h_sta_process */
1340
571ecf67
JB		 1341static inline struct ieee80211_fragment_entry *
1342ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1343 unsigned int frag, unsigned int seq, int rx_queue,
1344 struct sk_buff **skb)
1345{
1346 struct ieee80211_fragment_entry *entry;
1347 int idx;
1348
1349 idx = sdata->fragment_next;
1350 entry = &sdata->fragments[sdata->fragment_next++];
1351 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1352 sdata->fragment_next = 0;
1353
bdcbd8e0 1354 if (!skb_queue_empty(&entry->skb_list))
571ecf67 1355 __skb_queue_purge(&entry->skb_list);
571ecf67
JB		 1356
1357 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1358 *skb = NULL;
1359 entry->first_frag_time = jiffies;
1360 entry->seq = seq;
1361 entry->rx_queue = rx_queue;
1362 entry->last_frag = frag;
1363 entry->ccmp = 0;
1364 entry->extra_len = 0;
1365
1366 return entry;
1367}
1368
1369static inline struct ieee80211_fragment_entry *
1370ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1371 unsigned int frag, unsigned int seq,
571ecf67
JB		 1372 int rx_queue, struct ieee80211_hdr *hdr)
1373{
1374 struct ieee80211_fragment_entry *entry;
1375 int i, idx;
1376
1377 idx = sdata->fragment_next;
1378 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1379 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1380
1381 idx--;
1382 if (idx < 0)
1383 idx = IEEE80211_FRAGMENT_MAX - 1;
1384
1385 entry = &sdata->fragments[idx];
1386 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1387 entry->rx_queue != rx_queue ||
1388 entry->last_frag + 1 != frag)
1389 continue;
1390
b73d70ad 1391 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1392
b73d70ad
HH		 1393 /*
1394 * Check ftype and addresses are equal, else check next fragment
1395 */
1396 if (((hdr->frame_control ^ f_hdr->frame_control) &
1397 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
b203ca39
JP		 1398 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1399 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
571ecf67
JB		 1400 continue;
1401
ab46623e 1402 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1403 __skb_queue_purge(&entry->skb_list);
1404 continue;
1405 }
1406 return entry;
1407 }
1408
1409 return NULL;
1410}
1411
49461622 1412static ieee80211_rx_result debug_noinline
5cf121c3 1413ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1414{
1415 struct ieee80211_hdr *hdr;
1416 u16 sc;
358c8d9d 1417 __le16 fc;
571ecf67
JB		 1418 unsigned int frag, seq;
1419 struct ieee80211_fragment_entry *entry;
1420 struct sk_buff *skb;
554891e6 1421 struct ieee80211_rx_status *status;
571ecf67 1422
b73d70ad 1423 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1424 fc = hdr->frame_control;
571ecf67
JB		 1425 sc = le16_to_cpu(hdr->seq_ctrl);
1426 frag = sc & IEEE80211_SCTL_FRAG;
1427
358c8d9d 1428 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1429 (rx->skb)->len < 24 ||
1430 is_multicast_ether_addr(hdr->addr1))) {
1431 /* not fragmented */
1432 goto out;
1433 }
1434 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1435
e3cf8b3f
ZY		 1436 if (skb_linearize(rx->skb))
1437 return RX_DROP_UNUSABLE;
1438
058897a4
AK		 1439 /*
1440 * skb_linearize() might change the skb->data and
1441 * previously cached variables (in this case, hdr) need to
1442 * be refreshed with the new data.
1443 */
1444 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1445 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1446
1447 if (frag == 0) {
1448 /* This is the first fragment of a new frame. */
1449 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
9e26297a 1450 rx->seqno_idx, &(rx->skb));
97359d12 1451 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1452 ieee80211_has_protected(fc)) {
9e26297a 1453 int queue = rx->security_idx;
571ecf67
JB		 1454 /* Store CCMP PN so that we can verify that the next
1455 * fragment has a sequential PN value. */
1456 entry->ccmp = 1;
1457 memcpy(entry->last_pn,
9190252c 1458 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1459 CCMP_PN_LEN);
1460 }
9ae54c84 1461 return RX_QUEUED;
571ecf67
JB		 1462 }
1463
1464 /* This is a fragment for a frame that should already be pending in
1465 * fragment cache. Add this fragment to the end of the pending entry.
1466 */
9e26297a
JB		 1467 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1468 rx->seqno_idx, hdr);
571ecf67
JB		 1469 if (!entry) {
1470 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1471 return RX_DROP_MONITOR;
571ecf67
JB		 1472 }
1473
1474 /* Verify that MPDUs within one MSDU have sequential PN values.
1475 * (IEEE 802.11i, 8.3.3.4.5) */
1476 if (entry->ccmp) {
1477 int i;
1478 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1479 int queue;
97359d12 1480 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1481 return RX_DROP_UNUSABLE;
571ecf67
JB		 1482 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1483 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1484 pn[i]++;
1485 if (pn[i])
1486 break;
1487 }
9e26297a 1488 queue = rx->security_idx;
9190252c 1489 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1490 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1491 return RX_DROP_UNUSABLE;
571ecf67
JB		 1492 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1493 }
1494
358c8d9d 1495 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1496 __skb_queue_tail(&entry->skb_list, rx->skb);
1497 entry->last_frag = frag;
1498 entry->extra_len += rx->skb->len;
358c8d9d 1499 if (ieee80211_has_morefrags(fc)) {
571ecf67 1500 rx->skb = NULL;
9ae54c84 1501 return RX_QUEUED;
571ecf67
JB		 1502 }
1503
1504 rx->skb = __skb_dequeue(&entry->skb_list);
1505 if (skb_tailroom(rx->skb) < entry->extra_len) {
1506 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1507 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1508 GFP_ATOMIC))) {
1509 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1510 __skb_queue_purge(&entry->skb_list);
e4c26add 1511 return RX_DROP_UNUSABLE;
571ecf67
JB		 1512 }
1513 }
1514 while ((skb = __skb_dequeue(&entry->skb_list))) {
1515 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1516 dev_kfree_skb(skb);
1517 }
1518
1519 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1520 status = IEEE80211_SKB_RXCB(rx->skb);
1521 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1522
1523 out:
1524 if (rx->sta)
1525 rx->sta->rx_packets++;
1526 if (is_multicast_ether_addr(hdr->addr1))
1527 rx->local->dot11MulticastReceivedFrameCount++;
1528 else
1529 ieee80211_led_rx(rx->local);
9ae54c84 1530 return RX_CONTINUE;
571ecf67
JB		 1531}
1532
76ee65bf 1533static int
5cf121c3 1534ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1535{
07346f81 1536 if (unlikely(!rx->sta ||
c2c98fde 1537 !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1538 return -EACCES;
571ecf67 1539
76ee65bf 1540 return 0;
571ecf67
JB		 1541}
1542
76ee65bf 1543static int
358c8d9d 1544ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1545{
eb9fb5b8
JB		 1546 struct sk_buff *skb = rx->skb;
1547 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1548
3017b80b 1549 /*
7848ba7d
JB		 1550 * Pass through unencrypted frames if the hardware has
1551 * decrypted them already.
3017b80b 1552 */
eb9fb5b8 1553 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1554 return 0;
571ecf67
JB		 1555
1556 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1557 if (unlikely(!ieee80211_has_protected(fc) &&
1558 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1559 ieee80211_is_data(fc) &&
b3fc9c6c 1560 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1561 return -EACCES;
bef5d1c7
JB		 1562
1563 return 0;
1564}
1565
1566static int
1567ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1568{
1569 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1570 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1571 __le16 fc = hdr->frame_control;
bef5d1c7 1572
e3efca0a
JM		 1573 /*
1574 * Pass through unencrypted frames if the hardware has
1575 * decrypted them already.
1576 */
1577 if (status->flag & RX_FLAG_DECRYPTED)
1578 return 0;
bef5d1c7 1579
c2c98fde 1580 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1581 if (unlikely(!ieee80211_has_protected(fc) &&
1582 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1583 rx->key)) {
1584 if (ieee80211_is_deauth(fc))
1585 cfg80211_send_unprot_deauth(rx->sdata->dev,
1586 rx->skb->data,
1587 rx->skb->len);
1588 else if (ieee80211_is_disassoc(fc))
1589 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1590 rx->skb->data,
1591 rx->skb->len);
f2ca3ea4 1592 return -EACCES;
cf4e594e 1593 }
f2ca3ea4 1594 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1595 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1596 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1597 if (ieee80211_is_deauth(fc))
1598 cfg80211_send_unprot_deauth(rx->sdata->dev,
1599 rx->skb->data,
1600 rx->skb->len);
1601 else if (ieee80211_is_disassoc(fc))
1602 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1603 rx->skb->data,
1604 rx->skb->len);
f2ca3ea4 1605 return -EACCES;
cf4e594e 1606 }
f2ca3ea4
JM		 1607 /*
1608 * When using MFP, Action frames are not allowed prior to
1609 * having configured keys.
1610 */
1611 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1612 ieee80211_is_robust_mgmt_frame(
1613 (struct ieee80211_hdr *) rx->skb->data)))
1614 return -EACCES;
1615 }
b3fc9c6c 1616
76ee65bf 1617 return 0;
571ecf67
JB		 1618}
1619
76ee65bf 1620static int
4114fa21 1621__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
571ecf67 1622{
eb9fb5b8 1623 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1624 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1625 bool check_port_control = false;
1626 struct ethhdr *ehdr;
1627 int ret;
f14543ee 1628
4114fa21 1629 *port_control = false;
9bc383de
JB		 1630 if (ieee80211_has_a4(hdr->frame_control) &&
1631 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1632 return -1;
9bc383de 1633
fbb327c5
FF		 1634 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1635 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1636
1637 if (!sdata->u.mgd.use_4addr)
1638 return -1;
1639 else
1640 check_port_control = true;
1641 }
1642
9bc383de 1643 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1644 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1645 return -1;
571ecf67 1646
fbb327c5 1647 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
4114fa21 1648 if (ret < 0)
fbb327c5
FF		 1649 return ret;
1650
1651 ehdr = (struct ethhdr *) rx->skb->data;
4114fa21
FF		 1652 if (ehdr->h_proto == rx->sdata->control_port_protocol)
1653 *port_control = true;
1654 else if (check_port_control)
fbb327c5
FF		 1655 return -1;
1656
1657 return 0;
76ee65bf 1658}
571ecf67 1659
ce3edf6d
JB		 1660/*
1661 * requires that rx->skb is a frame with ethernet header
1662 */
358c8d9d 1663static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1664{
c97c23e3 1665 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1666 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1667 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1668
1669 /*
1670 * Allow EAPOL frames to us/the PAE group address regardless
1671 * of whether the frame was encrypted or not.
1672 */
a621fa4d 1673 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
3bc7945e
JP		 1674 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
1675 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
ce3edf6d
JB		 1676 return true;
1677
1678 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1679 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1680 return false;
1681
1682 return true;
1683}
1684
1685/*
1686 * requires that rx->skb is a frame with ethernet header
1687 */
76ee65bf 1688static void
5cf121c3 1689ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1690{
eb9fb5b8
JB		 1691 struct ieee80211_sub_if_data *sdata = rx->sdata;
1692 struct net_device *dev = sdata->dev;
76ee65bf 1693 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1694 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1695 struct sta_info *dsta;
554891e6 1696 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1697
76ee65bf
RR		 1698 skb = rx->skb;
1699 xmit_skb = NULL;
571ecf67 1700
05c914fe
JB		 1701 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1702 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1703 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1704 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1705 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1706 if (is_multicast_ether_addr(ehdr->h_dest)) {
1707 /*
1708 * send multicast frames both to higher layers in
1709 * local net stack and back to the wireless medium
1710 */
76ee65bf 1711 xmit_skb = skb_copy(skb, GFP_ATOMIC);
e87cc472 1712 if (!xmit_skb)
bdcbd8e0 1713 net_info_ratelimited("%s: failed to clone multicast frame\n",
e87cc472 1714 dev->name);
571ecf67 1715 } else {
abe60632
JB		 1716 dsta = sta_info_get(sdata, skb->data);
1717 if (dsta) {
ce3edf6d
JB		 1718 /*
1719 * The destination station is associated to
1720 * this AP (in this VLAN), so send the frame
1721 * directly to it and do not pass it to local
1722 * net stack.
571ecf67 1723 */
76ee65bf 1724 xmit_skb = skb;
571ecf67
JB		 1725 skb = NULL;
1726 }
571ecf67
JB		 1727 }
1728 }
1729
1730 if (skb) {
d1c3a37c
JB		 1731 int align __maybe_unused;
1732
59d9cb07 1733#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1734 /*
1735 * 'align' will only take the values 0 or 2 here
1736 * since all frames are required to be aligned
1737 * to 2-byte boundaries when being passed to
1738 * mac80211. That also explains the __skb_push()
1739 * below.
1740 */
dacb6f1d 1741 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1742 if (align) {
1743 if (WARN_ON(skb_headroom(skb) < 3)) {
1744 dev_kfree_skb(skb);
1745 skb = NULL;
1746 } else {
1747 u8 *data = skb->data;
8ce0b589
ZY		 1748 size_t len = skb_headlen(skb);
1749 skb->data -= align;
1750 memmove(skb->data, data, len);
1751 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1752 }
1753 }
1754#endif
1755
1756 if (skb) {
1757 /* deliver to local stack */
1758 skb->protocol = eth_type_trans(skb, dev);
1759 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1760 netif_receive_skb(skb);
d1c3a37c 1761 }
571ecf67
JB		 1762 }
1763
76ee65bf 1764 if (xmit_skb) {
aef6c928
HS		 1765 /*
1766 * Send to wireless media and increase priority by 256 to
1767 * keep the received priority instead of reclassifying
1768 * the frame (see cfg80211_classify8021d).
1769 */
1770 xmit_skb->priority += 256;
f831e909 1771 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1772 skb_reset_network_header(xmit_skb);
1773 skb_reset_mac_header(xmit_skb);
76ee65bf 1774 dev_queue_xmit(xmit_skb);
571ecf67 1775 }
76ee65bf
RR		 1776}
1777
49461622 1778static ieee80211_rx_result debug_noinline
5cf121c3 1779ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1780{
eb9fb5b8 1781 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1782 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1784 __le16 fc = hdr->frame_control;
eaf85ca7 1785 struct sk_buff_head frame_list;
554891e6 1786 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1787
358c8d9d 1788 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1789 return RX_CONTINUE;
fd4c7f2f 1790
358c8d9d 1791 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1792 return RX_DROP_MONITOR;
fd4c7f2f 1793
554891e6 1794 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1795 return RX_CONTINUE;
fd4c7f2f 1796
eaf85ca7
ZY		 1797 if (ieee80211_has_a4(hdr->frame_control) &&
1798 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1799 !rx->sdata->u.vlan.sta)
e4c26add 1800 return RX_DROP_UNUSABLE;
fd4c7f2f 1801
eaf85ca7
ZY		 1802 if (is_multicast_ether_addr(hdr->addr1) &&
1803 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1804 rx->sdata->u.vlan.sta) ||
1805 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1806 rx->sdata->u.mgd.use_4addr)))
e4c26add 1807 return RX_DROP_UNUSABLE;
fd4c7f2f 1808
eaf85ca7
ZY		 1809 skb->dev = dev;
1810 __skb_queue_head_init(&frame_list);
fd4c7f2f 1811
e3cf8b3f
ZY		 1812 if (skb_linearize(skb))
1813 return RX_DROP_UNUSABLE;
1814
eaf85ca7
ZY		 1815 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1816 rx->sdata->vif.type,
8b3becad 1817 rx->local->hw.extra_tx_headroom, true);
fd4c7f2f 1818
eaf85ca7
ZY		 1819 while (!skb_queue_empty(&frame_list)) {
1820 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1821
358c8d9d 1822 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1823 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1824 continue;
1825 }
eaf85ca7
ZY		 1826 dev->stats.rx_packets++;
1827 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1828
1829 ieee80211_deliver_skb(rx);
1830 }
1831
9ae54c84 1832 return RX_QUEUED;
fd4c7f2f
RR		 1833}
1834
bf94e17b 1835#ifdef CONFIG_MAC80211_MESH
b0dee578 1836static ieee80211_rx_result
e32f85f7
LCC		 1837ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1838{
30789eb6
TP		 1839 struct ieee80211_hdr *fwd_hdr, *hdr;
1840 struct ieee80211_tx_info *info;
e32f85f7 1841 struct ieee80211s_hdr *mesh_hdr;
e32f85f7 1842 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1843 struct ieee80211_local *local = rx->local;
eb9fb5b8 1844 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1845 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
30789eb6 1846 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0cfda851 1847 __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);
30789eb6 1848 u16 q, hdrlen;
e32f85f7
LCC		 1849
1850 hdr = (struct ieee80211_hdr *) skb->data;
1851 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1852 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1853
2157fdd6
TP		 1854 /* frame is in RMC, don't forward */
1855 if (ieee80211_is_data(hdr->frame_control) &&
1856 is_multicast_ether_addr(hdr->addr1) &&
1857 mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
1858 return RX_DROP_MONITOR;
1859
e32f85f7
LCC		 1860 if (!ieee80211_is_data(hdr->frame_control))
1861 return RX_CONTINUE;
1862
1863 if (!mesh_hdr->ttl)
e32f85f7
LCC		 1864 return RX_DROP_MONITOR;
1865
43b7b314 1866 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1867 struct mesh_path *mppath;
43b7b314
JC		 1868 char *proxied_addr;
1869 char *mpp_addr;
1870
1871 if (is_multicast_ether_addr(hdr->addr1)) {
1872 mpp_addr = hdr->addr3;
1873 proxied_addr = mesh_hdr->eaddr1;
1874 } else {
1875 mpp_addr = hdr->addr4;
1876 proxied_addr = mesh_hdr->eaddr2;
1877 }
79617dee 1878
79617dee 1879 rcu_read_lock();
43b7b314 1880 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1881 if (!mppath) {
43b7b314 1882 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1883 } else {
1884 spin_lock_bh(&mppath->state_lock);
b203ca39 1885 if (!ether_addr_equal(mppath->mpp, mpp_addr))
43b7b314 1886 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1887 spin_unlock_bh(&mppath->state_lock);
1888 }
1889 rcu_read_unlock();
1890 }
1891
3c5772a5
JC		 1892 /* Frame has reached destination. Don't forward */
1893 if (!is_multicast_ether_addr(hdr->addr1) &&
b203ca39 1894 ether_addr_equal(sdata->vif.addr, hdr->addr3))
e32f85f7
LCC		 1895 return RX_CONTINUE;
1896
00e96dec 1897 q = ieee80211_select_queue_80211(sdata, skb, hdr);
d3c1597b 1898 if (ieee80211_queue_stopped(&local->hw, q)) {
30789eb6 1899 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
d3c1597b
TP		 1900 return RX_DROP_MONITOR;
1901 }
1902 skb_set_queue_mapping(skb, q);
e32f85f7 1903
30789eb6
TP		 1904 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1905 goto out;
c8a61a7d 1906
30789eb6
TP		 1907 if (!--mesh_hdr->ttl) {
1908 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
1909 return RX_DROP_MONITOR;
1910 }
1911
d665508b
CYY		 1912 if (!ifmsh->mshcfg.dot11MeshForwarding)
1913 goto out;
1914
30789eb6
TP		 1915 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1916 if (!fwd_skb) {
bdcbd8e0 1917 net_info_ratelimited("%s: failed to clone mesh frame\n",
e87cc472 1918 sdata->name);
30789eb6
TP		 1919 goto out;
1920 }
1921
1922 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1923 info = IEEE80211_SKB_CB(fwd_skb);
1924 memset(info, 0, sizeof(*info));
1925 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1926 info->control.vif = &rx->sdata->vif;
1927 info->control.jiffies = jiffies;
1928 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
1929 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
1930 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
1931 } else if (!mesh_nexthop_lookup(fwd_skb, sdata)) {
1932 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
1933 } else {
1934 /* unable to resolve next hop */
1935 mesh_path_error_tx(ifmsh->mshcfg.element_ttl, fwd_hdr->addr3,
1936 0, reason, fwd_hdr->addr2, sdata);
1937 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
74b8cc3d 1938 kfree_skb(fwd_skb);
30789eb6 1939 return RX_DROP_MONITOR;
e32f85f7
LCC		 1940 }
1941
30789eb6
TP		 1942 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
1943 ieee80211_add_pending_skb(local, fwd_skb);
b51aff05 1944 out:
3c5772a5 1945 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1946 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1947 return RX_CONTINUE;
1948 else
1949 return RX_DROP_MONITOR;
1950}
bf94e17b 1951#endif
e32f85f7 1952
49461622 1953static ieee80211_rx_result debug_noinline
5cf121c3 1954ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1955{
eb9fb5b8 1956 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1957 struct ieee80211_local *local = rx->local;
eb9fb5b8 1958 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1959 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1960 __le16 fc = hdr->frame_control;
4114fa21 1961 bool port_control;
ce3edf6d 1962 int err;
76ee65bf 1963
358c8d9d 1964 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1965 return RX_CONTINUE;
76ee65bf 1966
358c8d9d 1967 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1968 return RX_DROP_MONITOR;
76ee65bf 1969
f14543ee 1970 /*
e7f4a940
JB		 1971 * Send unexpected-4addr-frame event to hostapd. For older versions,
1972 * also drop the frame to cooked monitor interfaces.
f14543ee
FF		 1973 */
1974 if (ieee80211_has_a4(hdr->frame_control) &&
e7f4a940
JB		 1975 sdata->vif.type == NL80211_IFTYPE_AP) {
1976 if (rx->sta &&
1977 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
1978 cfg80211_rx_unexpected_4addr_frame(
1979 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
f14543ee 1980 return RX_DROP_MONITOR;
e7f4a940 1981 }
f14543ee 1982
4114fa21 1983 err = __ieee80211_data_to_8023(rx, &port_control);
76ee65bf 1984 if (unlikely(err))
e4c26add 1985 return RX_DROP_UNUSABLE;
76ee65bf 1986
358c8d9d 1987 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1988 return RX_DROP_MONITOR;
ce3edf6d 1989
4114fa21
FF		 1990 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1991 unlikely(port_control) && sdata->bss) {
1992 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1993 u.ap);
1994 dev = sdata->dev;
1995 rx->sdata = sdata;
1996 }
1997
76ee65bf
RR		 1998 rx->skb->dev = dev;
1999
2000 dev->stats.rx_packets++;
2001 dev->stats.rx_bytes += rx->skb->len;
2002
08ca944e 2003 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
8c99f691
RM		 2004 !is_multicast_ether_addr(
2005 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2006 (!local->scanning &&
2007 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
e15276a4
VN		 2008 mod_timer(&local->dynamic_ps_timer, jiffies +
2009 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2010 }
2011
76ee65bf 2012 ieee80211_deliver_skb(rx);
571ecf67 2013
9ae54c84 2014 return RX_QUEUED;
571ecf67
JB		 2015}
2016
49461622 2017static ieee80211_rx_result debug_noinline
24a8fdad 2018ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716 2019{
71364716 2020 struct sk_buff *skb = rx->skb;
a7767f95 2021 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 2022 struct tid_ampdu_rx *tid_agg_rx;
2023 u16 start_seq_num;
2024 u16 tid;
2025
a7767f95 2026 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 2027 return RX_CONTINUE;
71364716 2028
a7767f95 2029 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 2030 struct {
2031 __le16 control, start_seq_num;
2032 } __packed bar_data;
2033
71364716 2034 if (!rx->sta)
a02ae758 2035 return RX_DROP_MONITOR;
8ae5977f
JB		 2036
2037 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2038 &bar_data, sizeof(bar_data)))
2039 return RX_DROP_MONITOR;
2040
8ae5977f 2041 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 2042
2043 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2044 if (!tid_agg_rx)
a02ae758 2045 return RX_DROP_MONITOR;
71364716 2046
8ae5977f 2047 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 2048
2049 /* reset session timer */
20ad19d0
JB		 2050 if (tid_agg_rx->timeout)
2051 mod_timer(&tid_agg_rx->session_timer,
2052 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 2053
dd318575 2054 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 2055 /* release stored frames up to start of BAR */
d3b2fb53
JB		 2056 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
2057 start_seq_num);
dd318575
JB		 2058 spin_unlock(&tid_agg_rx->reorder_lock);
2059
a02ae758
JB		 2060 kfree_skb(skb);
2061 return RX_QUEUED;
71364716
RR		 2062 }
2063
08daecae
JB		 2064 /*
2065 * After this point, we only want management frames,
2066 * so we can drop all remaining control frames to
2067 * cooked monitor interfaces.
2068 */
2069 return RX_DROP_MONITOR;
71364716
RR		 2070}
2071
f4f727a6
JM		 2072static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2073 struct ieee80211_mgmt *mgmt,
2074 size_t len)
fea14732
JM		 2075{
2076 struct ieee80211_local *local = sdata->local;
2077 struct sk_buff *skb;
2078 struct ieee80211_mgmt *resp;
2079
b203ca39 2080 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
fea14732
JM		 2081 /* Not to own unicast address */
2082 return;
2083 }
2084
b203ca39
JP		 2085 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2086 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
77fdaa12 2087 /* Not from the current AP or not associated yet. */
fea14732
JM		 2088 return;
2089 }
2090
2091 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2092 /* Too short SA Query request frame */
2093 return;
2094 }
2095
2096 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2097 if (skb == NULL)
2098 return;
2099
2100 skb_reserve(skb, local->hw.extra_tx_headroom);
2101 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2102 memset(resp, 0, 24);
2103 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2104 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2105 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2106 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2107 IEEE80211_STYPE_ACTION);
2108 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2109 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2110 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2111 memcpy(resp->u.action.u.sa_query.trans_id,
2112 mgmt->u.action.u.sa_query.trans_id,
2113 WLAN_SA_QUERY_TR_ID_LEN);
2114
62ae67be 2115 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2116}
2117
2e161f78
JB		 2118static ieee80211_rx_result debug_noinline
2119ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2120{
2121 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2122 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2123
2124 /*
2125 * From here on, look only at management frames.
2126 * Data and control frames are already handled,
2127 * and unknown (reserved) frames are useless.
2128 */
2129 if (rx->skb->len < 24)
2130 return RX_DROP_MONITOR;
2131
2132 if (!ieee80211_is_mgmt(mgmt->frame_control))
2133 return RX_DROP_MONITOR;
2134
ee971924
JB		 2135 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2136 ieee80211_is_beacon(mgmt->frame_control) &&
2137 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
804483e9
JB		 2138 int sig = 0;
2139
2140 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2141 sig = status->signal;
2142
ee971924
JB		 2143 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2144 rx->skb->data, rx->skb->len,
804483e9 2145 status->freq, sig, GFP_ATOMIC);
ee971924
JB		 2146 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2147 }
2148
554891e6 2149 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2150 return RX_DROP_MONITOR;
2151
2152 if (ieee80211_drop_unencrypted_mgmt(rx))
2153 return RX_DROP_UNUSABLE;
2154
2155 return RX_CONTINUE;
2156}
2157
de1ede7a
JB		 2158static ieee80211_rx_result debug_noinline
2159ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2160{
2161 struct ieee80211_local *local = rx->local;
eb9fb5b8 2162 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2163 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2165 int len = rx->skb->len;
2166
2167 if (!ieee80211_is_action(mgmt->frame_control))
2168 return RX_CONTINUE;
2169
026331c4
JM		 2170 /* drop too small frames */
2171 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2172 return RX_DROP_UNUSABLE;
de1ede7a 2173
026331c4 2174 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2175 return RX_DROP_UNUSABLE;
de1ede7a 2176
554891e6 2177 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2178 return RX_DROP_UNUSABLE;
97ebe12a 2179
de1ede7a 2180 switch (mgmt->u.action.category) {
1d8d3dec
JB		 2181 case WLAN_CATEGORY_HT:
2182 /* reject HT action frames from stations not supporting HT */
2183 if (!rx->sta->sta.ht_cap.ht_supported)
2184 goto invalid;
2185
2186 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2187 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2188 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2189 sdata->vif.type != NL80211_IFTYPE_AP &&
2190 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2191 break;
2192
2193 /* verify action & smps_control are present */
2194 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2195 goto invalid;
2196
2197 switch (mgmt->u.action.u.ht_smps.action) {
2198 case WLAN_HT_ACTION_SMPS: {
2199 struct ieee80211_supported_band *sband;
2200 u8 smps;
2201
2202 /* convert to HT capability */
2203 switch (mgmt->u.action.u.ht_smps.smps_control) {
2204 case WLAN_HT_SMPS_CONTROL_DISABLED:
2205 smps = WLAN_HT_CAP_SM_PS_DISABLED;
2206 break;
2207 case WLAN_HT_SMPS_CONTROL_STATIC:
2208 smps = WLAN_HT_CAP_SM_PS_STATIC;
2209 break;
2210 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
2211 smps = WLAN_HT_CAP_SM_PS_DYNAMIC;
2212 break;
2213 default:
2214 goto invalid;
2215 }
2216 smps <<= IEEE80211_HT_CAP_SM_PS_SHIFT;
2217
2218 /* if no change do nothing */
2219 if ((rx->sta->sta.ht_cap.cap &
2220 IEEE80211_HT_CAP_SM_PS) == smps)
2221 goto handled;
2222
2223 rx->sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SM_PS;
2224 rx->sta->sta.ht_cap.cap |= smps;
2225
2226 sband = rx->local->hw.wiphy->bands[status->band];
2227
64f68e5d
JB		 2228 rate_control_rate_update(local, sband, rx->sta,
2229 IEEE80211_RC_SMPS_CHANGED);
1d8d3dec
JB		 2230 goto handled;
2231 }
2232 default:
2233 goto invalid;
2234 }
2235
2236 break;
de1ede7a 2237 case WLAN_CATEGORY_BACK:
8abd3f9b 2238 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
ae2772b3 2239 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
8abd3f9b 2240 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
13c40c54
AS		 2241 sdata->vif.type != NL80211_IFTYPE_AP &&
2242 sdata->vif.type != NL80211_IFTYPE_ADHOC)
84040805 2243 break;
8abd3f9b 2244
026331c4
JM		 2245 /* verify action_code is present */
2246 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2247 break;
2248
de1ede7a
JB		 2249 switch (mgmt->u.action.u.addba_req.action_code) {
2250 case WLAN_ACTION_ADDBA_REQ:
2251 if (len < (IEEE80211_MIN_ACTION_SIZE +
2252 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2253 goto invalid;
2254 break;
de1ede7a
JB		 2255 case WLAN_ACTION_ADDBA_RESP:
2256 if (len < (IEEE80211_MIN_ACTION_SIZE +
2257 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2258 goto invalid;
2259 break;
de1ede7a
JB		 2260 case WLAN_ACTION_DELBA:
2261 if (len < (IEEE80211_MIN_ACTION_SIZE +
2262 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2263 goto invalid;
2264 break;
2265 default:
2266 goto invalid;
de1ede7a 2267 }
bed7ee6e 2268
8b58ff83 2269 goto queue;
39192c0b
JB		 2270 case WLAN_CATEGORY_SPECTRUM_MGMT:
2271 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2272 break;
46900298
JB		 2273
2274 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2275 break;
46900298 2276
026331c4
JM		 2277 /* verify action_code is present */
2278 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2279 break;
2280
39192c0b
JB		 2281 switch (mgmt->u.action.u.measurement.action_code) {
2282 case WLAN_ACTION_SPCT_MSR_REQ:
2283 if (len < (IEEE80211_MIN_ACTION_SIZE +
2284 sizeof(mgmt->u.action.u.measurement)))
84040805 2285 break;
39192c0b 2286 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2287 goto handled;
c481ec97
S		 2288 case WLAN_ACTION_SPCT_CHL_SWITCH:
2289 if (len < (IEEE80211_MIN_ACTION_SIZE +
2290 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2291 break;
c481ec97 2292
cc32abd4 2293 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2294 break;
cc32abd4 2295
b203ca39 2296 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
84040805 2297 break;
c481ec97 2298
8b58ff83 2299 goto queue;
39192c0b
JB		 2300 }
2301 break;
fea14732
JM		 2302 case WLAN_CATEGORY_SA_QUERY:
2303 if (len < (IEEE80211_MIN_ACTION_SIZE +
2304 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2305 break;
2306
fea14732
JM		 2307 switch (mgmt->u.action.u.sa_query.action) {
2308 case WLAN_ACTION_SA_QUERY_REQUEST:
2309 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2310 break;
fea14732 2311 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2312 goto handled;
fea14732
JM		 2313 }
2314 break;
8db09850
TP		 2315 case WLAN_CATEGORY_SELF_PROTECTED:
2316 switch (mgmt->u.action.u.self_prot.action_code) {
2317 case WLAN_SP_MESH_PEERING_OPEN:
2318 case WLAN_SP_MESH_PEERING_CLOSE:
2319 case WLAN_SP_MESH_PEERING_CONFIRM:
2320 if (!ieee80211_vif_is_mesh(&sdata->vif))
2321 goto invalid;
2322 if (sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE)
2323 /* userspace handles this frame */
2324 break;
2325 goto queue;
2326 case WLAN_SP_MGK_INFORM:
2327 case WLAN_SP_MGK_ACK:
2328 if (!ieee80211_vif_is_mesh(&sdata->vif))
2329 goto invalid;
2330 break;
2331 }
2332 break;
d3aaec8a 2333 case WLAN_CATEGORY_MESH_ACTION:
77a121c3
JB		 2334 if (!ieee80211_vif_is_mesh(&sdata->vif))
2335 break;
25d49e4d
TP		 2336 if (mesh_action_is_path_sel(mgmt) &&
2337 (!mesh_path_sel_is_hwmp(sdata)))
c7108a71
JC		 2338 break;
2339 goto queue;
84040805 2340 }
026331c4 2341
2e161f78
JB		 2342 return RX_CONTINUE;
2343
bed7ee6e 2344 invalid:
554891e6 2345 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2346 /* will return in the next handlers */
2347 return RX_CONTINUE;
2348
2349 handled:
2350 if (rx->sta)
2351 rx->sta->rx_packets++;
2352 dev_kfree_skb(rx->skb);
2353 return RX_QUEUED;
2354
2355 queue:
2356 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2357 skb_queue_tail(&sdata->skb_queue, rx->skb);
2358 ieee80211_queue_work(&local->hw, &sdata->work);
2359 if (rx->sta)
2360 rx->sta->rx_packets++;
2361 return RX_QUEUED;
2362}
2363
2364static ieee80211_rx_result debug_noinline
2365ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2366{
554891e6 2367 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
804483e9 2368 int sig = 0;
2e161f78
JB		 2369
2370 /* skip known-bad action frames and return them in the next handler */
554891e6 2371 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2372 return RX_CONTINUE;
d7907448 2373
026331c4
JM		 2374 /*
2375 * Getting here means the kernel doesn't know how to handle
2376 * it, but maybe userspace does ... include returned frames
2377 * so userspace can register for those to know whether ones
2378 * it transmitted were processed or returned.
2379 */
026331c4 2380
804483e9
JB		 2381 if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
2382 sig = status->signal;
2383
71bbc994 2384 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
2e161f78
JB		 2385 rx->skb->data, rx->skb->len,
2386 GFP_ATOMIC)) {
2387 if (rx->sta)
2388 rx->sta->rx_packets++;
2389 dev_kfree_skb(rx->skb);
2390 return RX_QUEUED;
2391 }
2392
2393
2394 return RX_CONTINUE;
2395}
2396
2397static ieee80211_rx_result debug_noinline
2398ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2399{
2400 struct ieee80211_local *local = rx->local;
2401 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2402 struct sk_buff *nskb;
2403 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2404 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2405
2406 if (!ieee80211_is_action(mgmt->frame_control))
2407 return RX_CONTINUE;
2408
2409 /*
2410 * For AP mode, hostapd is responsible for handling any action
2411 * frames that we didn't handle, including returning unknown
2412 * ones. For all other modes we will return them to the sender,
2413 * setting the 0x80 bit in the action category, as required by
4b5ebccc 2414 * 802.11-2012 9.24.4.
2e161f78
JB		 2415 * Newer versions of hostapd shall also use the management frame
2416 * registration mechanisms, but older ones still use cooked
2417 * monitor interfaces so push all frames there.
2418 */
554891e6 2419 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2420 (sdata->vif.type == NL80211_IFTYPE_AP ||
2421 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2422 return RX_DROP_MONITOR;
026331c4 2423
4b5ebccc
JB		 2424 if (is_multicast_ether_addr(mgmt->da))
2425 return RX_DROP_MONITOR;
2426
84040805
JB		 2427 /* do not return rejected action frames */
2428 if (mgmt->u.action.category & 0x80)
2429 return RX_DROP_UNUSABLE;
2430
2431 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2432 GFP_ATOMIC);
2433 if (nskb) {
292b4df6 2434 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2435
292b4df6
JL		 2436 nmgmt->u.action.category |= 0x80;
2437 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2438 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2439
2440 memset(nskb->cb, 0, sizeof(nskb->cb));
2441
2442 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2443 }
39192c0b
JB		 2444 dev_kfree_skb(rx->skb);
2445 return RX_QUEUED;
de1ede7a
JB		 2446}
2447
49461622 2448static ieee80211_rx_result debug_noinline
5cf121c3 2449ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2450{
eb9fb5b8 2451 struct ieee80211_sub_if_data *sdata = rx->sdata;
77a121c3
JB		 2452 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2453 __le16 stype;
571ecf67 2454
77a121c3 2455 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2456
77a121c3
JB		 2457 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2458 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2459 sdata->vif.type != NL80211_IFTYPE_STATION)
2460 return RX_DROP_MONITOR;
472dbc45 2461
77a121c3 2462 switch (stype) {
66e67e41 2463 case cpu_to_le16(IEEE80211_STYPE_AUTH):
77a121c3
JB		 2464 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2465 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2466 /* process for all: mesh, mlme, ibss */
2467 break;
66e67e41
JB		 2468 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
2469 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
77a121c3
JB		 2470 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2471 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2472 if (is_multicast_ether_addr(mgmt->da) &&
2473 !is_broadcast_ether_addr(mgmt->da))
2474 return RX_DROP_MONITOR;
2475
77a121c3
JB		 2476 /* process only for station */
2477 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2478 return RX_DROP_MONITOR;
2479 break;
2480 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
77a121c3
JB		 2481 /* process only for ibss */
2482 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2483 return RX_DROP_MONITOR;
2484 break;
2485 default:
2486 return RX_DROP_MONITOR;
2487 }
f9d540ee 2488
77a121c3 2489 /* queue up frame and kick off work to process it */
c1475ca9 2490 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2491 skb_queue_tail(&sdata->skb_queue, rx->skb);
2492 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2493 if (rx->sta)
2494 rx->sta->rx_packets++;
46900298 2495
77a121c3 2496 return RX_QUEUED;
571ecf67
JB		 2497}
2498
5cf121c3 2499/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2500static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2501 struct ieee80211_rate *rate)
3d30d949
MW		 2502{
2503 struct ieee80211_sub_if_data *sdata;
2504 struct ieee80211_local *local = rx->local;
3d30d949
MW		 2505 struct sk_buff *skb = rx->skb, *skb2;
2506 struct net_device *prev_dev = NULL;
eb9fb5b8 2507 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
293702a3 2508 int needed_headroom;
3d30d949 2509
554891e6
JB		 2510 /*
2511 * If cooked monitor has been processed already, then
2512 * don't do it again. If not, set the flag.
2513 */
2514 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2515 goto out_free_skb;
554891e6 2516 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2517
152c477a
JB		 2518 /* If there are no cooked monitor interfaces, just free the SKB */
2519 if (!local->cooked_mntrs)
2520 goto out_free_skb;
2521
293702a3
JB		 2522 /* room for the radiotap header based on driver features */
2523 needed_headroom = ieee80211_rx_radiotap_len(local, status);
3d30d949 2524
293702a3
JB		 2525 if (skb_headroom(skb) < needed_headroom &&
2526 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
2527 goto out_free_skb;
3d30d949 2528
293702a3 2529 /* prepend radiotap information */
973ef21a
FF		 2530 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
2531 false);
3d30d949
MW		 2532
2533 skb_set_mac_header(skb, 0);
2534 skb->ip_summed = CHECKSUM_UNNECESSARY;
2535 skb->pkt_type = PACKET_OTHERHOST;
2536 skb->protocol = htons(ETH_P_802_2);
2537
2538 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2539 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2540 continue;
2541
05c914fe 2542 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2543 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2544 continue;
2545
2546 if (prev_dev) {
2547 skb2 = skb_clone(skb, GFP_ATOMIC);
2548 if (skb2) {
2549 skb2->dev = prev_dev;
5548a8a1 2550 netif_receive_skb(skb2);
3d30d949
MW		 2551 }
2552 }
2553
2554 prev_dev = sdata->dev;
2555 sdata->dev->stats.rx_packets++;
2556 sdata->dev->stats.rx_bytes += skb->len;
2557 }
2558
2559 if (prev_dev) {
2560 skb->dev = prev_dev;
5548a8a1 2561 netif_receive_skb(skb);
554891e6
JB		 2562 return;
2563 }
3d30d949
MW		 2564
2565 out_free_skb:
2566 dev_kfree_skb(skb);
2567}
2568
aa0c8636
CL		 2569static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2570 ieee80211_rx_result res)
2571{
2572 switch (res) {
2573 case RX_DROP_MONITOR:
2574 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2575 if (rx->sta)
2576 rx->sta->rx_dropped++;
2577 /* fall through */
2578 case RX_CONTINUE: {
2579 struct ieee80211_rate *rate = NULL;
2580 struct ieee80211_supported_band *sband;
2581 struct ieee80211_rx_status *status;
2582
2583 status = IEEE80211_SKB_RXCB((rx->skb));
2584
2585 sband = rx->local->hw.wiphy->bands[status->band];
2586 if (!(status->flag & RX_FLAG_HT))
2587 rate = &sband->bitrates[status->rate_idx];
2588
2589 ieee80211_rx_cooked_monitor(rx, rate);
2590 break;
2591 }
2592 case RX_DROP_UNUSABLE:
2593 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2594 if (rx->sta)
2595 rx->sta->rx_dropped++;
2596 dev_kfree_skb(rx->skb);
2597 break;
2598 case RX_QUEUED:
2599 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2600 break;
2601 }
2602}
571ecf67 2603
24a8fdad 2604static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2605{
58905290 2606 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2607 struct sk_buff *skb;
8944b79f 2608
e32f85f7
LCC		 2609#define CALL_RXH(rxh) \
2610 do { \
2611 res = rxh(rx); \
2612 if (res != RX_CONTINUE) \
2569a826 2613 goto rxh_next; \
e32f85f7 2614 } while (0);
49461622 2615
24a8fdad
CL		 2616 spin_lock(&rx->local->rx_skb_queue.lock);
2617 if (rx->local->running_rx_handler)
2618 goto unlock;
2619
2620 rx->local->running_rx_handler = true;
2621
2622 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2623 spin_unlock(&rx->local->rx_skb_queue.lock);
2624
2569a826
JB		 2625 /*
2626 * all the other fields are valid across frames
2627 * that belong to an aMPDU since they are on the
2628 * same TID from the same station
2629 */
2630 rx->skb = skb;
2631
2632 CALL_RXH(ieee80211_rx_h_decrypt)
2633 CALL_RXH(ieee80211_rx_h_check_more_data)
47086fc5 2634 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
2569a826
JB		 2635 CALL_RXH(ieee80211_rx_h_sta_process)
2636 CALL_RXH(ieee80211_rx_h_defragment)
2569a826
JB		 2637 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2638 /* must be after MMIC verify so header is counted in MPDU mic */
bf94e17b 2639#ifdef CONFIG_MAC80211_MESH
aa0c8636 2640 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2641 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2642#endif
2154c81c 2643 CALL_RXH(ieee80211_rx_h_amsdu)
2569a826 2644 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2645 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2646 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2647 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2648 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2649 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2650 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2651
aa0c8636
CL		 2652 rxh_next:
2653 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2654 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2655#undef CALL_RXH
aa0c8636 2656 }
24a8fdad
CL		 2657
2658 rx->local->running_rx_handler = false;
2659
2660 unlock:
2661 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2662}
2663
4406c376 2664static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2665{
aa0c8636
CL		 2666 ieee80211_rx_result res = RX_DROP_MONITOR;
2667
aa0c8636
CL		 2668#define CALL_RXH(rxh) \
2669 do { \
2670 res = rxh(rx); \
2671 if (res != RX_CONTINUE) \
2672 goto rxh_next; \
2673 } while (0);
2674
aa0c8636
CL		 2675 CALL_RXH(ieee80211_rx_h_check)
2676
24a8fdad 2677 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2678
24a8fdad 2679 ieee80211_rx_handlers(rx);
aa0c8636 2680 return;
49461622 2681
2569a826 2682 rxh_next:
aa0c8636
CL		 2683 ieee80211_rx_handlers_result(rx, res);
2684
2685#undef CALL_RXH
58905290
JB		 2686}
2687
2bff8ebf 2688/*
dd318575
JB		 2689 * This function makes calls into the RX path, therefore
2690 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2691 */
2692void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2693{
554891e6
JB		 2694 struct ieee80211_rx_data rx = {
2695 .sta = sta,
2696 .sdata = sta->sdata,
2697 .local = sta->local,
9e26297a
JB		 2698 /* This is OK -- must be QoS data frame */
2699 .security_idx = tid,
2700 .seqno_idx = tid,
fcf8bd3b 2701 .flags = 0,
554891e6 2702 };
2c15a0cf
CL		 2703 struct tid_ampdu_rx *tid_agg_rx;
2704
2705 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2706 if (!tid_agg_rx)
2707 return;
2bff8ebf 2708
2c15a0cf 2709 spin_lock(&tid_agg_rx->reorder_lock);
d3b2fb53 2710 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx);
2c15a0cf 2711 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2712
24a8fdad 2713 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2714}
2715
571ecf67
JB		 2716/* main receive path */
2717
20b01f80 2718static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2719 struct ieee80211_hdr *hdr)
2720{
20b01f80 2721 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2722 struct sk_buff *skb = rx->skb;
2723 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2724 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2725 int multicast = is_multicast_ether_addr(hdr->addr1);
2726
51fb61e7 2727 switch (sdata->vif.type) {
05c914fe 2728 case NL80211_IFTYPE_STATION:
9bc383de 2729 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2730 return 0;
77fdaa12 2731 if (!multicast &&
b203ca39 2732 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4f312336
FF		 2733 if (!(sdata->dev->flags & IFF_PROMISC) ||
2734 sdata->u.mgd.use_4addr)
23a24def 2735 return 0;
554891e6 2736 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2737 }
2738 break;
05c914fe 2739 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2740 if (!bssid)
2741 return 0;
a7767f95 2742 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2743 return 1;
d48b2968
JB		 2744 } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
2745 return 0;
23a24def 2746 } else if (!multicast &&
b203ca39 2747 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
4150c572 2748 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2749 return 0;
554891e6 2750 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2751 } else if (!rx->sta) {
2752 int rate_idx;
eb9fb5b8 2753 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2754 rate_idx = 0; /* TODO: HT rates */
2755 else
eb9fb5b8 2756 rate_idx = status->rate_idx;
8bf11d8d
JB		 2757 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
2758 BIT(rate_idx));
0fb8ca45 2759 }
23a24def 2760 break;
05c914fe 2761 case NL80211_IFTYPE_MESH_POINT:
6032f934 2762 if (!multicast &&
b203ca39 2763 !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
6032f934
JB		 2764 if (!(sdata->dev->flags & IFF_PROMISC))
2765 return 0;
2766
554891e6 2767 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2768 }
2769 break;
05c914fe
JB		 2770 case NL80211_IFTYPE_AP_VLAN:
2771 case NL80211_IFTYPE_AP:
23a24def 2772 if (!bssid) {
b203ca39 2773 if (!ether_addr_equal(sdata->vif.addr, hdr->addr1))
23a24def
JB		 2774 return 0;
2775 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2776 sdata->vif.addr)) {
3df6eaea
JB		 2777 /*
2778 * Accept public action frames even when the
2779 * BSSID doesn't match, this is used for P2P
2780 * and location updates. Note that mac80211
2781 * itself never looks at these frames.
2782 */
d48b2968 2783 if (ieee80211_is_public_action(hdr, skb->len))
3df6eaea 2784 return 1;
d48b2968 2785 if (!ieee80211_is_beacon(hdr->frame_control))
23a24def 2786 return 0;
554891e6 2787 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2788 }
23a24def 2789 break;
05c914fe 2790 case NL80211_IFTYPE_WDS:
a7767f95 2791 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def 2792 return 0;
b203ca39 2793 if (!ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2))
23a24def
JB		 2794 return 0;
2795 break;
2ca27bcf 2796 default:
fb1c1cd6
JB		 2797 /* should never get here */
2798 WARN_ON(1);
2799 break;
23a24def
JB		 2800 }
2801
2802 return 1;
2803}
2804
4406c376
JB		 2805/*
2806 * This function returns whether or not the SKB
2807 * was destined for RX processing or not, which,
2808 * if consume is true, is equivalent to whether
2809 * or not the skb was consumed.
2810 */
2811static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2812 struct sk_buff *skb, bool consume)
2813{
2814 struct ieee80211_local *local = rx->local;
2815 struct ieee80211_sub_if_data *sdata = rx->sdata;
2816 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2817 struct ieee80211_hdr *hdr = (void *)skb->data;
2818 int prepares;
2819
2820 rx->skb = skb;
554891e6 2821 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2822 prepares = prepare_for_handlers(rx, hdr);
2823
2824 if (!prepares)
2825 return false;
2826
4406c376
JB		 2827 if (!consume) {
2828 skb = skb_copy(skb, GFP_ATOMIC);
2829 if (!skb) {
2830 if (net_ratelimit())
2831 wiphy_debug(local->hw.wiphy,
b305dae4 2832 "failed to copy skb for %s\n",
4406c376
JB		 2833 sdata->name);
2834 return true;
2835 }
2836
2837 rx->skb = skb;
2838 }
2839
2840 ieee80211_invoke_rx_handlers(rx);
2841 return true;
2842}
2843
571ecf67 2844/*
6368e4b1
RR		 2845 * This is the actual Rx frames handler. as it blongs to Rx path it must
2846 * be called with rcu_read_lock protection.
571ecf67 2847 */
71ebb4aa 2848static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2849 struct sk_buff *skb)
571ecf67
JB		 2850{
2851 struct ieee80211_local *local = hw_to_local(hw);
2852 struct ieee80211_sub_if_data *sdata;
571ecf67 2853 struct ieee80211_hdr *hdr;
e3cf8b3f 2854 __le16 fc;
5cf121c3 2855 struct ieee80211_rx_data rx;
4406c376 2856 struct ieee80211_sub_if_data *prev;
56af3268 2857 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2858 int err = 0;
571ecf67 2859
e3cf8b3f 2860 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2861 memset(&rx, 0, sizeof(rx));
2862 rx.skb = skb;
2863 rx.local = local;
72abd81b 2864
e3cf8b3f 2865 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2866 local->dot11ReceivedFragmentCount++;
571ecf67 2867
e3cf8b3f
ZY		 2868 if (ieee80211_is_mgmt(fc))
2869 err = skb_linearize(skb);
2870 else
2871 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2872
2873 if (err) {
2874 dev_kfree_skb(skb);
2875 return;
2876 }
2877
2878 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2879 ieee80211_parse_qos(&rx);
d1c3a37c 2880 ieee80211_verify_alignment(&rx);
38f3714d 2881
d48b2968
JB		 2882 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
2883 ieee80211_is_beacon(hdr->frame_control)))
2884 ieee80211_scan_rx(local, skb);
2885
e3cf8b3f 2886 if (ieee80211_is_data(fc)) {
56af3268 2887 prev_sta = NULL;
4406c376 2888
7852e361 2889 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2890 if (!prev_sta) {
2891 prev_sta = sta;
2892 continue;
2893 }
2894
2895 rx.sta = prev_sta;
2896 rx.sdata = prev_sta->sdata;
4406c376 2897 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2898
56af3268 2899 prev_sta = sta;
4406c376 2900 }
56af3268
BG		 2901
2902 if (prev_sta) {
2903 rx.sta = prev_sta;
2904 rx.sdata = prev_sta->sdata;
2905
4406c376 2906 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2907 return;
8e26d5ad 2908 goto out;
56af3268 2909 }
4406c376
JB		 2910 }
2911
4b0dd98e 2912 prev = NULL;
b2e7771e 2913
4b0dd98e
JB		 2914 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2915 if (!ieee80211_sdata_running(sdata))
2916 continue;
340e11f3 2917
4b0dd98e
JB		 2918 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2919 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2920 continue;
340e11f3 2921
4b0dd98e
JB		 2922 /*
2923 * frame is destined for this interface, but if it's
2924 * not also for the previous one we handle that after
2925 * the loop to avoid copying the SKB once too much
2926 */
4bb29f8c 2927
4b0dd98e 2928 if (!prev) {
abe60632 2929 prev = sdata;
4b0dd98e 2930 continue;
340e11f3 2931 }
4bb29f8c 2932
7852e361 2933 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e
JB		 2934 rx.sdata = prev;
2935 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2936
4b0dd98e
JB		 2937 prev = sdata;
2938 }
2939
2940 if (prev) {
7852e361 2941 rx.sta = sta_info_get_bss(prev, hdr->addr2);
4b0dd98e 2942 rx.sdata = prev;
4406c376 2943
4b0dd98e
JB		 2944 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2945 return;
571ecf67 2946 }
4406c376 2947
8e26d5ad 2948 out:
4406c376 2949 dev_kfree_skb(skb);
571ecf67 2950}
6368e4b1
RR		 2951
2952/*
2953 * This is the receive path handler. It is called by a low level driver when an
2954 * 802.11 MPDU is received from the hardware.
2955 */
103bf9f7 2956void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2957{
2958 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2959 struct ieee80211_rate *rate = NULL;
2960 struct ieee80211_supported_band *sband;
f1d58c25 2961 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2962
d20ef63d
JB		 2963 WARN_ON_ONCE(softirq_count() == 0);
2964
77a980dc
JB		 2965 if (WARN_ON(status->band < 0 ||
2966 status->band >= IEEE80211_NUM_BANDS))
2967 goto drop;
8318d78a
JB		 2968
2969 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2970 if (WARN_ON(!sband))
2971 goto drop;
8318d78a 2972
89c3a8ac
JB		 2973 /*
2974 * If we're suspending, it is possible although not too likely
2975 * that we'd be receiving frames after having already partially
2976 * quiesced the stack. We can't process such frames then since
2977 * that might, for example, cause stations to be added or other
2978 * driver callbacks be invoked.
2979 */
77a980dc
JB		 2980 if (unlikely(local->quiescing || local->suspended))
2981 goto drop;
89c3a8ac 2982
04800ada
AN		 2983 /* We might be during a HW reconfig, prevent Rx for the same reason */
2984 if (unlikely(local->in_reconfig))
2985 goto drop;
2986
ea77f12f
JB		 2987 /*
2988 * The same happens when we're not even started,
2989 * but that's worth a warning.
2990 */
77a980dc
JB		 2991 if (WARN_ON(!local->started))
2992 goto drop;
ea77f12f 2993
fc885189 2994 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2995 /*
fc885189
JB		 2996 * Validate the rate, unless a PLCP error means that
2997 * we probably can't have a valid rate here anyway.
e5d6eb83 2998 */
fc885189
JB		 2999
3000 if (status->flag & RX_FLAG_HT) {
3001 /*
3002 * rate_idx is MCS index, which can be [0-76]
3003 * as documented on:
3004 *
3005 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3006 *
3007 * Anything else would be some sort of driver or
3008 * hardware error. The driver should catch hardware
3009 * errors.
3010 */
3011 if (WARN((status->rate_idx < 0 ||
3012 status->rate_idx > 76),
3013 "Rate marked as an HT rate but passed "
3014 "status->rate_idx is not "
3015 "an MCS index [0-76]: %d (0x%02x)\n",
3016 status->rate_idx,
3017 status->rate_idx))
3018 goto drop;
3019 } else {
3020 if (WARN_ON(status->rate_idx < 0 ||
3021 status->rate_idx >= sband->n_bitrates))
3022 goto drop;
3023 rate = &sband->bitrates[status->rate_idx];
3024 }
0fb8ca45 3025 }
6368e4b1 3026
554891e6
JB		 3027 status->rx_flags = 0;
3028
6368e4b1
RR		 3029 /*
3030 * key references and virtual interfaces are protected using RCU
3031 * and this requires that we are in a read-side RCU section during
3032 * receive processing
3033 */
3034 rcu_read_lock();
3035
3036 /*
3037 * Frames with failed FCS/PLCP checksum are not returned,
3038 * all other frames are returned without radiotap header
3039 * if it was previously present.
3040 * Also, frames with less than 16 bytes are dropped.
3041 */
f1d58c25 3042 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 3043 if (!skb) {
3044 rcu_read_unlock();
3045 return;
3046 }
3047
e1e54068
JB		 3048 ieee80211_tpt_led_trig_rx(local,
3049 ((struct ieee80211_hdr *)skb->data)->frame_control,
3050 skb->len);
071d9ac2 3051 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 3052
3053 rcu_read_unlock();
77a980dc
JB		 3054
3055 return;
3056 drop:
3057 kfree_skb(skb);
6368e4b1 3058}
103bf9f7 3059EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 3060
3061/* This is a version of the rx handler that can be called from hard irq
3062 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 3063void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 3064{
3065 struct ieee80211_local *local = hw_to_local(hw);
3066
3067 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3068
571ecf67
JB		 3069 skb->pkt_type = IEEE80211_RX_MSG;
3070 skb_queue_tail(&local->skb_queue, skb);
3071 tasklet_schedule(&local->tasklet);
3072}
3073EXPORT_SYMBOL(ieee80211_rx_irqsafe);
kernel source for telekom puls (alcatel/mediatek)