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mac80211: do not calc frame duration when using HW rate-control
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / rx.c
CommitLineData
571ecf67
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
84040805 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
571ecf67
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
ab46623e 12#include <linux/jiffies.h>
5a0e3ad6 13#include <linux/slab.h>
571ecf67
JB		 14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
d4e46a3d 18#include <linux/rcupdate.h>
571ecf67
JB		 19#include <net/mac80211.h>
20#include <net/ieee80211_radiotap.h>
21
22#include "ieee80211_i.h"
24487981 23#include "driver-ops.h"
2c8dccc7 24#include "led.h"
33b64eb2 25#include "mesh.h"
571ecf67
JB		 26#include "wep.h"
27#include "wpa.h"
28#include "tkip.h"
29#include "wme.h"
30
b2e7771e
JB		 31/*
32 * monitor mode reception
33 *
34 * This function cleans up the SKB, i.e. it removes all the stuff
35 * only useful for monitoring.
36 */
37static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
0869aea0 38 struct sk_buff *skb)
b2e7771e 39{
b2e7771e
JB		 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
41 if (likely(skb->len > FCS_LEN))
e3cf8b3f 42 __pskb_trim(skb, skb->len - FCS_LEN);
b2e7771e
JB		 43 else {
44 /* driver bug */
45 WARN_ON(1);
46 dev_kfree_skb(skb);
47 skb = NULL;
48 }
49 }
50
51 return skb;
52}
53
f1d58c25 54static inline int should_drop_frame(struct sk_buff *skb,
0869aea0 55 int present_fcs_len)
b2e7771e 56{
f1d58c25 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 59
60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
61 return 1;
0869aea0 62 if (unlikely(skb->len < 16 + present_fcs_len))
b2e7771e 63 return 1;
87228f57
HH		 64 if (ieee80211_is_ctl(hdr->frame_control) &&
65 !ieee80211_is_pspoll(hdr->frame_control) &&
66 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 67 return 1;
68 return 0;
69}
70
601ae7f2
BR		 71static int
72ieee80211_rx_radiotap_len(struct ieee80211_local *local,
73 struct ieee80211_rx_status *status)
74{
75 int len;
76
77 /* always present fields */
78 len = sizeof(struct ieee80211_radiotap_header) + 9;
79
80 if (status->flag & RX_FLAG_TSFT)
81 len += 8;
7fee5372 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2 83 len += 1;
601ae7f2
BR		 84
85 if (len & 1) /* padding for RX_FLAGS if necessary */
86 len++;
87
6d744bac
JB		 88 if (status->flag & RX_FLAG_HT) /* HT info */
89 len += 3;
90
601ae7f2
BR		 91 return len;
92}
93
d1c3a37c 94/*
601ae7f2
BR		 95 * ieee80211_add_rx_radiotap_header - add radiotap header
96 *
97 * add a radiotap header containing all the fields which the hardware provided.
98 */
99static void
100ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
101 struct sk_buff *skb,
601ae7f2
BR		 102 struct ieee80211_rate *rate,
103 int rtap_len)
104{
f1d58c25 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 106 struct ieee80211_radiotap_header *rthdr;
107 unsigned char *pos;
6a86b9c7 108 u16 rx_flags = 0;
601ae7f2
BR		 109
110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
111 memset(rthdr, 0, rtap_len);
112
113 /* radiotap header, set always present flags */
114 rthdr->it_present =
115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 116 (1 << IEEE80211_RADIOTAP_CHANNEL) |
117 (1 << IEEE80211_RADIOTAP_ANTENNA) |
118 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
119 rthdr->it_len = cpu_to_le16(rtap_len);
120
121 pos = (unsigned char *)(rthdr+1);
122
123 /* the order of the following fields is important */
124
125 /* IEEE80211_RADIOTAP_TSFT */
126 if (status->flag & RX_FLAG_TSFT) {
6a86b9c7 127 put_unaligned_le64(status->mactime, pos);
601ae7f2
BR		 128 rthdr->it_present |=
129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
130 pos += 8;
131 }
132
133 /* IEEE80211_RADIOTAP_FLAGS */
134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
135 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
137 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 138 if (status->flag & RX_FLAG_SHORTPRE)
139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 140 pos++;
141
142 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 143 if (status->flag & RX_FLAG_HT) {
144 /*
145 * TODO: add following information into radiotap header once
146 * suitable fields are defined for it:
147 * - MCS index (status->rate_idx)
148 * - HT40 (status->flag & RX_FLAG_40MHZ)
149 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
150 */
151 *pos = 0;
8d6f658e 152 } else {
ebe6c7ba 153 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 154 *pos = rate->bitrate / 5;
8d6f658e 155 }
601ae7f2
BR		 156 pos++;
157
158 /* IEEE80211_RADIOTAP_CHANNEL */
6a86b9c7 159 put_unaligned_le16(status->freq, pos);
601ae7f2
BR		 160 pos += 2;
161 if (status->band == IEEE80211_BAND_5GHZ)
6a86b9c7
JB		 162 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
163 pos);
5f0b7de5
JB		 164 else if (status->flag & RX_FLAG_HT)
165 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,
166 pos);
9deb1ae5 167 else if (rate->flags & IEEE80211_RATE_ERP_G)
6a86b9c7
JB		 168 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
169 pos);
601ae7f2 170 else
6a86b9c7
JB		 171 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
172 pos);
601ae7f2
BR		 173 pos += 2;
174
175 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
176 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
177 *pos = status->signal;
178 rthdr->it_present |=
179 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
180 pos++;
181 }
182
601ae7f2
BR		 183 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
184
185 /* IEEE80211_RADIOTAP_ANTENNA */
186 *pos = status->antenna;
187 pos++;
188
601ae7f2
BR		 189 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
190
191 /* IEEE80211_RADIOTAP_RX_FLAGS */
192 /* ensure 2 byte alignment for the 2 byte field as required */
6a86b9c7 193 if ((pos - (u8 *)rthdr) & 1)
601ae7f2 194 pos++;
aae89831 195 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
6a86b9c7
JB		 196 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
197 put_unaligned_le16(rx_flags, pos);
601ae7f2 198 pos += 2;
6d744bac
JB		 199
200 if (status->flag & RX_FLAG_HT) {
201 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
202 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
203 IEEE80211_RADIOTAP_MCS_HAVE_GI |
204 IEEE80211_RADIOTAP_MCS_HAVE_BW;
205 *pos = 0;
206 if (status->flag & RX_FLAG_SHORT_GI)
207 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
208 if (status->flag & RX_FLAG_40MHZ)
209 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
210 pos++;
211 *pos++ = status->rate_idx;
212 }
601ae7f2
BR		 213}
214
b2e7771e
JB		 215/*
216 * This function copies a received frame to all monitor interfaces and
217 * returns a cleaned-up SKB that no longer includes the FCS nor the
218 * radiotap header the driver might have added.
219 */
220static struct sk_buff *
221ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a 222 struct ieee80211_rate *rate)
b2e7771e 223{
f1d58c25 224 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
b2e7771e 225 struct ieee80211_sub_if_data *sdata;
b2e7771e 226 int needed_headroom = 0;
b2e7771e
JB		 227 struct sk_buff *skb, *skb2;
228 struct net_device *prev_dev = NULL;
229 int present_fcs_len = 0;
b2e7771e
JB		 230
231 /*
232 * First, we may need to make a copy of the skb because
233 * (1) we need to modify it for radiotap (if not present), and
234 * (2) the other RX handlers will modify the skb we got.
235 *
236 * We don't need to, of course, if we aren't going to return
237 * the SKB because it has a bad FCS/PLCP checksum.
238 */
0869aea0
JB		 239
240 /* room for the radiotap header based on driver features */
241 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 242
243 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
244 present_fcs_len = FCS_LEN;
245
e3cf8b3f
ZY		 246 /* make sure hdr->frame_control is on the linear part */
247 if (!pskb_may_pull(origskb, 2)) {
248 dev_kfree_skb(origskb);
249 return NULL;
250 }
251
b2e7771e 252 if (!local->monitors) {
0869aea0 253 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 254 dev_kfree_skb(origskb);
255 return NULL;
256 }
257
0869aea0 258 return remove_monitor_info(local, origskb);
b2e7771e
JB		 259 }
260
0869aea0 261 if (should_drop_frame(origskb, present_fcs_len)) {
b2e7771e
JB		 262 /* only need to expand headroom if necessary */
263 skb = origskb;
264 origskb = NULL;
265
266 /*
267 * This shouldn't trigger often because most devices have an
268 * RX header they pull before we get here, and that should
269 * be big enough for our radiotap information. We should
270 * probably export the length to drivers so that we can have
271 * them allocate enough headroom to start with.
272 */
273 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 274 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 275 dev_kfree_skb(skb);
276 return NULL;
277 }
278 } else {
279 /*
280 * Need to make a copy and possibly remove radiotap header
281 * and FCS from the original.
282 */
283 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
284
0869aea0 285 origskb = remove_monitor_info(local, origskb);
b2e7771e
JB		 286
287 if (!skb)
288 return origskb;
289 }
290
0869aea0
JB		 291 /* prepend radiotap information */
292 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom);
b2e7771e 293
ce3edf6d 294 skb_reset_mac_header(skb);
b2e7771e
JB		 295 skb->ip_summed = CHECKSUM_UNNECESSARY;
296 skb->pkt_type = PACKET_OTHERHOST;
297 skb->protocol = htons(ETH_P_802_2);
298
299 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 300 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 301 continue;
302
3d30d949
MW		 303 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
304 continue;
305
9607e6b6 306 if (!ieee80211_sdata_running(sdata))
47846c9b
JB		 307 continue;
308
b2e7771e
JB		 309 if (prev_dev) {
310 skb2 = skb_clone(skb, GFP_ATOMIC);
311 if (skb2) {
312 skb2->dev = prev_dev;
5548a8a1 313 netif_receive_skb(skb2);
b2e7771e
JB		 314 }
315 }
316
317 prev_dev = sdata->dev;
318 sdata->dev->stats.rx_packets++;
319 sdata->dev->stats.rx_bytes += skb->len;
320 }
321
322 if (prev_dev) {
323 skb->dev = prev_dev;
5548a8a1 324 netif_receive_skb(skb);
b2e7771e
JB		 325 } else
326 dev_kfree_skb(skb);
327
328 return origskb;
329}
330
331
5cf121c3 332static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 333{
238f74a2 334 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 335 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
6e0d114d
JB		 336 int tid;
337
338 /* does the frame have a qos control field? */
238f74a2
HH		 339 if (ieee80211_is_data_qos(hdr->frame_control)) {
340 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 341 /* frame has qos control */
238f74a2
HH		 342 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
343 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
554891e6 344 status->rx_flags |= IEEE80211_RX_AMSDU;
6e0d114d 345 } else {
1411f9b5
JB		 346 /*
347 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
348 *
349 * Sequence numbers for management frames, QoS data
350 * frames with a broadcast/multicast address in the
351 * Address 1 field, and all non-QoS data frames sent
352 * by QoS STAs are assigned using an additional single
353 * modulo-4096 counter, [...]
354 *
355 * We also use that counter for non-QoS STAs.
356 */
357 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 358 }
52865dfd 359
5cf121c3 360 rx->queue = tid;
6e0d114d
JB		 361 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
362 * For now, set skb->priority to 0 for other cases. */
363 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 364}
6e0d114d 365
d1c3a37c
JB		 366/**
367 * DOC: Packet alignment
368 *
369 * Drivers always need to pass packets that are aligned to two-byte boundaries
370 * to the stack.
371 *
372 * Additionally, should, if possible, align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-byte
374 * boundary. In the case of regular frames, this simply means aligning the
375 * payload to a four-byte boundary (because either the IP header is directly
376 * contained, or IV/RFC1042 headers that have a length divisible by four are
59d9cb07
KV		 377 * in front of it). If the payload data is not properly aligned and the
378 * architecture doesn't support efficient unaligned operations, mac80211
379 * will align the data.
d1c3a37c
JB		 380 *
381 * With A-MSDU frames, however, the payload data address must yield two modulo
382 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
383 * push the IP header further back to a multiple of four again. Thankfully, the
384 * specs were sane enough this time around to require padding each A-MSDU
385 * subframe to a length that is a multiple of four.
386 *
387 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
388 * the payload is not supported, the driver is required to move the 802.11
389 * header to be directly in front of the payload in that case.
390 */
391static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 392{
59d9cb07
KV		 393#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
394 WARN_ONCE((unsigned long)rx->skb->data & 1,
395 "unaligned packet at 0x%p\n", rx->skb->data);
d1c3a37c 396#endif
6e0d114d
JB		 397}
398
6368e4b1 399
571ecf67
JB		 400/* rx handlers */
401
49461622 402static ieee80211_rx_result debug_noinline
5cf121c3 403ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 404{
405 struct ieee80211_local *local = rx->local;
554891e6 406 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 407 struct sk_buff *skb = rx->skb;
408
554891e6 409 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
4080c7cd
JB		 410 return RX_CONTINUE;
411
412 if (test_bit(SCAN_HW_SCANNING, &local->scanning))
f1d58c25 413 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 414
4080c7cd 415 if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
ece8eddd 416 /* drop all the other packets during a software scan anyway */
f1d58c25 417 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 418 dev_kfree_skb(skb);
9ae54c84 419 return RX_QUEUED;
571ecf67
JB		 420 }
421
4080c7cd
JB		 422 /* scanning finished during invoking of handlers */
423 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
424 return RX_DROP_UNUSABLE;
571ecf67
JB		 425}
426
3cfcf6ac
JM		 427
428static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
429{
430 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
431
432 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
433 return 0;
434
435 return ieee80211_is_robust_mgmt_frame(hdr);
436}
437
438
439static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
440{
441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
442
443 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
444 return 0;
445
446 return ieee80211_is_robust_mgmt_frame(hdr);
447}
448
449
450/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
451static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
452{
453 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
454 struct ieee80211_mmie *mmie;
455
456 if (skb->len < 24 + sizeof(*mmie) ||
457 !is_multicast_ether_addr(hdr->da))
458 return -1;
459
460 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
461 return -1; /* not a robust management frame */
462
463 mmie = (struct ieee80211_mmie *)
464 (skb->data + skb->len - sizeof(*mmie));
465 if (mmie->element_id != WLAN_EID_MMIE ||
466 mmie->length != sizeof(*mmie) - 2)
467 return -1;
468
469 return le16_to_cpu(mmie->key_id);
470}
471
472
33b64eb2 473static ieee80211_rx_result
5cf121c3 474ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 475{
a7767f95
HH		 476 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
477 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
47846c9b 478 char *dev_addr = rx->sdata->vif.addr;
d6d1a5a7 479
a7767f95 480 if (ieee80211_is_data(hdr->frame_control)) {
3c5772a5
JC		 481 if (is_multicast_ether_addr(hdr->addr1)) {
482 if (ieee80211_has_tods(hdr->frame_control) ||
483 !ieee80211_has_fromds(hdr->frame_control))
484 return RX_DROP_MONITOR;
485 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0)
486 return RX_DROP_MONITOR;
487 } else {
488 if (!ieee80211_has_a4(hdr->frame_control))
489 return RX_DROP_MONITOR;
490 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0)
491 return RX_DROP_MONITOR;
492 }
33b64eb2
LCC		 493 }
494
495 /* If there is not an established peer link and this is not a peer link
496 * establisment frame, beacon or probe, drop the frame.
497 */
498
b4e08ea1 499 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 500 struct ieee80211_mgmt *mgmt;
d6d1a5a7 501
a7767f95 502 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 503 return RX_DROP_MONITOR;
504
a7767f95 505 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2 506 mgmt = (struct ieee80211_mgmt *)hdr;
97ad9139 507 if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK)
33b64eb2 508 return RX_DROP_MONITOR;
33b64eb2 509 return RX_CONTINUE;
33b64eb2
LCC		 510 }
511
a7767f95
HH		 512 if (ieee80211_is_probe_req(hdr->frame_control) ||
513 ieee80211_is_probe_resp(hdr->frame_control) ||
514 ieee80211_is_beacon(hdr->frame_control))
515 return RX_CONTINUE;
516
517 return RX_DROP_MONITOR;
518
519 }
520
521#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
522
523 if (ieee80211_is_data(hdr->frame_control) &&
524 is_multicast_ether_addr(hdr->addr1) &&
3c5772a5 525 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 526 return RX_DROP_MONITOR;
902acc78 527#undef msh_h_get
d6d1a5a7 528
902acc78
JB		 529 return RX_CONTINUE;
530}
33b64eb2 531
1edfb1af
JB		 532#define SEQ_MODULO 0x1000
533#define SEQ_MASK 0xfff
534
535static inline int seq_less(u16 sq1, u16 sq2)
536{
537 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
538}
539
540static inline u16 seq_inc(u16 sq)
541{
542 return (sq + 1) & SEQ_MASK;
543}
544
545static inline u16 seq_sub(u16 sq1, u16 sq2)
546{
547 return (sq1 - sq2) & SEQ_MASK;
548}
549
550
551static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
552 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 553 int index)
1edfb1af 554{
24a8fdad 555 struct ieee80211_local *local = hw_to_local(hw);
1edfb1af 556 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
4cfda47b 557 struct ieee80211_rx_status *status;
1edfb1af 558
dd318575
JB		 559 lockdep_assert_held(&tid_agg_rx->reorder_lock);
560
1edfb1af
JB		 561 if (!skb)
562 goto no_frame;
563
071d9ac2 564 /* release the frame from the reorder ring buffer */
1edfb1af
JB		 565 tid_agg_rx->stored_mpdu_num--;
566 tid_agg_rx->reorder_buf[index] = NULL;
4cfda47b
CL		 567 status = IEEE80211_SKB_RXCB(skb);
568 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
24a8fdad 569 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af
JB		 570
571no_frame:
572 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
573}
574
575static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw,
576 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 577 u16 head_seq_num)
1edfb1af
JB		 578{
579 int index;
580
dd318575
JB		 581 lockdep_assert_held(&tid_agg_rx->reorder_lock);
582
1edfb1af
JB		 583 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
584 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
585 tid_agg_rx->buf_size;
24a8fdad 586 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
1edfb1af
JB		 587 }
588}
589
590/*
591 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
592 * the skb was added to the buffer longer than this time ago, the earlier
593 * frames that have not yet been received are assumed to be lost and the skb
594 * can be released for processing. This may also release other skb's from the
595 * reorder buffer if there are no additional gaps between the frames.
2bff8ebf
CL		 596 *
597 * Callers must hold tid_agg_rx->reorder_lock.
1edfb1af
JB		 598 */
599#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
600
aa0c8636 601static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw,
24a8fdad 602 struct tid_ampdu_rx *tid_agg_rx)
aa0c8636 603{
2bff8ebf 604 int index, j;
aa0c8636 605
dd318575
JB		 606 lockdep_assert_held(&tid_agg_rx->reorder_lock);
607
aa0c8636
CL		 608 /* release the buffer until next missing frame */
609 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
610 tid_agg_rx->buf_size;
611 if (!tid_agg_rx->reorder_buf[index] &&
612 tid_agg_rx->stored_mpdu_num > 1) {
613 /*
614 * No buffers ready to be released, but check whether any
615 * frames in the reorder buffer have timed out.
616 */
aa0c8636
CL		 617 int skipped = 1;
618 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
619 j = (j + 1) % tid_agg_rx->buf_size) {
620 if (!tid_agg_rx->reorder_buf[j]) {
621 skipped++;
622 continue;
623 }
624 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
625 HT_RX_REORDER_BUF_TIMEOUT))
2bff8ebf 626 goto set_release_timer;
aa0c8636
CL		 627
628#ifdef CONFIG_MAC80211_HT_DEBUG
629 if (net_ratelimit())
0fb9a9ec
JP		 630 wiphy_debug(hw->wiphy,
631 "release an RX reorder frame due to timeout on earlier frames\n");
aa0c8636 632#endif
24a8fdad 633 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
aa0c8636
CL		 634
635 /*
636 * Increment the head seq# also for the skipped slots.
637 */
638 tid_agg_rx->head_seq_num =
639 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK;
640 skipped = 0;
641 }
642 } else while (tid_agg_rx->reorder_buf[index]) {
24a8fdad 643 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
aa0c8636
CL		 644 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) %
645 tid_agg_rx->buf_size;
646 }
2bff8ebf
CL		 647
648 if (tid_agg_rx->stored_mpdu_num) {
649 j = index = seq_sub(tid_agg_rx->head_seq_num,
650 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
651
652 for (; j != (index - 1) % tid_agg_rx->buf_size;
653 j = (j + 1) % tid_agg_rx->buf_size) {
654 if (tid_agg_rx->reorder_buf[j])
655 break;
656 }
657
658 set_release_timer:
659
660 mod_timer(&tid_agg_rx->reorder_timer,
661 tid_agg_rx->reorder_time[j] +
662 HT_RX_REORDER_BUF_TIMEOUT);
663 } else {
664 del_timer(&tid_agg_rx->reorder_timer);
665 }
aa0c8636
CL		 666}
667
1edfb1af
JB		 668/*
669 * As this function belongs to the RX path it must be under
670 * rcu_read_lock protection. It returns false if the frame
671 * can be processed immediately, true if it was consumed.
672 */
673static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
674 struct tid_ampdu_rx *tid_agg_rx,
24a8fdad 675 struct sk_buff *skb)
1edfb1af
JB		 676{
677 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
678 u16 sc = le16_to_cpu(hdr->seq_ctrl);
679 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
680 u16 head_seq_num, buf_size;
681 int index;
2bff8ebf 682 bool ret = true;
1edfb1af 683
dd318575
JB		 684 spin_lock(&tid_agg_rx->reorder_lock);
685
1edfb1af
JB		 686 buf_size = tid_agg_rx->buf_size;
687 head_seq_num = tid_agg_rx->head_seq_num;
688
689 /* frame with out of date sequence number */
690 if (seq_less(mpdu_seq_num, head_seq_num)) {
691 dev_kfree_skb(skb);
2bff8ebf 692 goto out;
1edfb1af
JB		 693 }
694
695 /*
696 * If frame the sequence number exceeds our buffering window
697 * size release some previous frames to make room for this one.
698 */
699 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) {
700 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size));
701 /* release stored frames up to new head to stack */
24a8fdad 702 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num);
1edfb1af
JB		 703 }
704
705 /* Now the new frame is always in the range of the reordering buffer */
706
707 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size;
708
709 /* check if we already stored this frame */
710 if (tid_agg_rx->reorder_buf[index]) {
711 dev_kfree_skb(skb);
2bff8ebf 712 goto out;
1edfb1af
JB		 713 }
714
715 /*
716 * If the current MPDU is in the right order and nothing else
717 * is stored we can process it directly, no need to buffer it.
718 */
719 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
720 tid_agg_rx->stored_mpdu_num == 0) {
721 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2bff8ebf
CL		 722 ret = false;
723 goto out;
1edfb1af
JB		 724 }
725
726 /* put the frame in the reordering buffer */
727 tid_agg_rx->reorder_buf[index] = skb;
728 tid_agg_rx->reorder_time[index] = jiffies;
729 tid_agg_rx->stored_mpdu_num++;
24a8fdad 730 ieee80211_sta_reorder_release(hw, tid_agg_rx);
1edfb1af 731
2bff8ebf
CL		 732 out:
733 spin_unlock(&tid_agg_rx->reorder_lock);
734 return ret;
1edfb1af
JB		 735}
736
737/*
738 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
739 * true if the MPDU was buffered, false if it should be processed.
740 */
24a8fdad 741static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx)
1edfb1af 742{
2569a826
JB		 743 struct sk_buff *skb = rx->skb;
744 struct ieee80211_local *local = rx->local;
1edfb1af
JB		 745 struct ieee80211_hw *hw = &local->hw;
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2569a826 747 struct sta_info *sta = rx->sta;
1edfb1af
JB		 748 struct tid_ampdu_rx *tid_agg_rx;
749 u16 sc;
750 int tid;
751
752 if (!ieee80211_is_data_qos(hdr->frame_control))
2569a826 753 goto dont_reorder;
1edfb1af
JB		 754
755 /*
756 * filter the QoS data rx stream according to
757 * STA/TID and check if this STA/TID is on aggregation
758 */
759
1edfb1af 760 if (!sta)
2569a826 761 goto dont_reorder;
1edfb1af
JB		 762
763 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
764
a87f736d
JB		 765 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
766 if (!tid_agg_rx)
767 goto dont_reorder;
1edfb1af
JB		 768
769 /* qos null data frames are excluded */
770 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
a87f736d 771 goto dont_reorder;
1edfb1af
JB		 772
773 /* new, potentially un-ordered, ampdu frame - process it */
774
775 /* reset session timer */
776 if (tid_agg_rx->timeout)
777 mod_timer(&tid_agg_rx->session_timer,
778 TU_TO_EXP_TIME(tid_agg_rx->timeout));
779
780 /* if this mpdu is fragmented - terminate rx aggregation session */
781 sc = le16_to_cpu(hdr->seq_ctrl);
782 if (sc & IEEE80211_SCTL_FRAG) {
c1475ca9 783 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
344eec67
JB		 784 skb_queue_tail(&rx->sdata->skb_queue, skb);
785 ieee80211_queue_work(&local->hw, &rx->sdata->work);
2569a826 786 return;
1edfb1af
JB		 787 }
788
a87f736d
JB		 789 /*
790 * No locking needed -- we will only ever process one
791 * RX packet at a time, and thus own tid_agg_rx. All
792 * other code manipulating it needs to (and does) make
793 * sure that we cannot get to it any more before doing
794 * anything with it.
795 */
24a8fdad 796 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb))
2569a826
JB		 797 return;
798
799 dont_reorder:
24a8fdad 800 skb_queue_tail(&local->rx_skb_queue, skb);
1edfb1af 801}
33b64eb2 802
49461622 803static ieee80211_rx_result debug_noinline
5cf121c3 804ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 805{
a7767f95 806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
554891e6 807 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67
JB		 808
809 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
810 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 811 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 812 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 813 hdr->seq_ctrl)) {
554891e6 814 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 815 rx->local->dot11FrameDuplicateCount++;
816 rx->sta->num_duplicates++;
817 }
e4c26add 818 return RX_DROP_MONITOR;
571ecf67 819 } else
5cf121c3 820 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 821 }
822
571ecf67
JB		 823 if (unlikely(rx->skb->len < 16)) {
824 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 825 return RX_DROP_MONITOR;
571ecf67
JB		 826 }
827
571ecf67
JB		 828 /* Drop disallowed frame classes based on STA auth/assoc state;
829 * IEEE 802.11, Chap 5.5.
830 *
ccd7b362
JB		 831 * mac80211 filters only based on association state, i.e. it drops
832 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 833 * deauth/disassoc frames when needed. In addition, hostapd is
834 * responsible for filtering on both auth and assoc states.
835 */
33b64eb2 836
902acc78 837 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 838 return ieee80211_rx_mesh_check(rx);
33b64eb2 839
a7767f95
HH		 840 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
841 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 842 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1be7fe8d 843 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
07346f81 844 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 845 if ((!ieee80211_has_fromds(hdr->frame_control) &&
846 !ieee80211_has_tods(hdr->frame_control) &&
847 ieee80211_is_data(hdr->frame_control)) ||
554891e6 848 !(status->rx_flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 849 /* Drop IBSS frames and frames for other hosts
850 * silently. */
e4c26add 851 return RX_DROP_MONITOR;
571ecf67
JB		 852 }
853
e4c26add 854 return RX_DROP_MONITOR;
571ecf67
JB		 855 }
856
9ae54c84 857 return RX_CONTINUE;
570bd537
JB		 858}
859
860
49461622 861static ieee80211_rx_result debug_noinline
5cf121c3 862ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 863{
eb9fb5b8
JB		 864 struct sk_buff *skb = rx->skb;
865 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
866 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3017b80b
JB		 867 int keyidx;
868 int hdrlen;
e4c26add 869 ieee80211_rx_result result = RX_DROP_UNUSABLE;
e31b8213 870 struct ieee80211_key *sta_ptk = NULL;
3cfcf6ac 871 int mmie_keyidx = -1;
761ab470 872 __le16 fc;
570bd537 873
3017b80b
JB		 874 /*
875 * Key selection 101
876 *
3cfcf6ac 877 * There are four types of keys:
3017b80b 878 * - GTK (group keys)
3cfcf6ac 879 * - IGTK (group keys for management frames)
3017b80b
JB		 880 * - PTK (pairwise keys)
881 * - STK (station-to-station pairwise keys)
882 *
883 * When selecting a key, we have to distinguish between multicast
884 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 885 * use PTKs and STKs while the former always use GTKs and IGTKs.
886 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
887 * unicast frames can also use key indices like GTKs. Hence, if we
888 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 889 *
8dc06a1c
JB		 890 * Note that in a regular BSS, multicast frames are sent by the
891 * AP only, associated stations unicast the frame to the AP first
892 * which then multicasts it on their behalf.
893 *
3017b80b
JB		 894 * There is also a slight problem in IBSS mode: GTKs are negotiated
895 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 896 * The spec seems to expect that one negotiates the same key with
897 * every station but there's no such requirement; VLANs could be
898 * possible.
3017b80b
JB		 899 */
900
3017b80b 901 /*
1990af8d 902 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 903 * addressed to us nor a multicast frame.
904 */
554891e6 905 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 906 return RX_CONTINUE;
3017b80b 907
2569a826
JB		 908 /* start without a key */
909 rx->key = NULL;
910
d4e46a3d 911 if (rx->sta)
e31b8213 912 sta_ptk = rcu_dereference(rx->sta->ptk);
d4e46a3d 913
761ab470
JB		 914 fc = hdr->frame_control;
915
916 if (!ieee80211_has_protected(fc))
0c7c10c7
JM		 917 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
918
e31b8213
JB		 919 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
920 rx->key = sta_ptk;
dc1580dd
JB		 921 if ((status->flag & RX_FLAG_DECRYPTED) &&
922 (status->flag & RX_FLAG_IV_STRIPPED))
923 return RX_CONTINUE;
0c7c10c7 924 /* Skip decryption if the frame is not protected. */
761ab470 925 if (!ieee80211_has_protected(fc))
0c7c10c7 926 return RX_CONTINUE;
3cfcf6ac
JM		 927 } else if (mmie_keyidx >= 0) {
928 /* Broadcast/multicast robust management frame / BIP */
eb9fb5b8
JB		 929 if ((status->flag & RX_FLAG_DECRYPTED) &&
930 (status->flag & RX_FLAG_IV_STRIPPED))
3cfcf6ac
JM		 931 return RX_CONTINUE;
932
933 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
934 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
935 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
e31b8213
JB		 936 if (rx->sta)
937 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
938 if (!rx->key)
939 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
761ab470 940 } else if (!ieee80211_has_protected(fc)) {
0c7c10c7
JM		 941 /*
942 * The frame was not protected, so skip decryption. However, we
943 * need to set rx->key if there is a key that could have been
944 * used so that the frame may be dropped if encryption would
945 * have been expected.
946 */
947 struct ieee80211_key *key = NULL;
897bed8b
JB		 948 struct ieee80211_sub_if_data *sdata = rx->sdata;
949 int i;
950
761ab470 951 if (ieee80211_is_mgmt(fc) &&
0c7c10c7
JM		 952 is_multicast_ether_addr(hdr->addr1) &&
953 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
954 rx->key = key;
897bed8b
JB		 955 else {
956 if (rx->sta) {
957 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
958 key = rcu_dereference(rx->sta->gtk[i]);
959 if (key)
960 break;
961 }
962 }
963 if (!key) {
964 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
965 key = rcu_dereference(sdata->keys[i]);
966 if (key)
967 break;
968 }
969 }
970 if (key)
971 rx->key = key;
972 }
0c7c10c7 973 return RX_CONTINUE;
571ecf67 974 } else {
39184b15 975 u8 keyid;
3017b80b
JB		 976 /*
977 * The device doesn't give us the IV so we won't be
978 * able to look up the key. That's ok though, we
979 * don't need to decrypt the frame, we just won't
980 * be able to keep statistics accurate.
981 * Except for key threshold notifications, should
982 * we somehow allow the driver to tell us which key
983 * the hardware used if this flag is set?
984 */
eb9fb5b8
JB		 985 if ((status->flag & RX_FLAG_DECRYPTED) &&
986 (status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 987 return RX_CONTINUE;
3017b80b 988
761ab470 989 hdrlen = ieee80211_hdrlen(fc);
3017b80b
JB		 990
991 if (rx->skb->len < 8 + hdrlen)
e4c26add 992 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 993
994 /*
995 * no need to call ieee80211_wep_get_keyidx,
996 * it verifies a bunch of things we've done already
997 */
39184b15
ZY		 998 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
999 keyidx = keyid >> 6;
3017b80b 1000
e31b8213
JB		 1001 /* check per-station GTK first, if multicast packet */
1002 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1003 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
3017b80b 1004
e31b8213
JB		 1005 /* if not found, try default key */
1006 if (!rx->key) {
1007 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1008
1009 /*
1010 * RSNA-protected unicast frames should always be
1011 * sent with pairwise or station-to-station keys,
1012 * but for WEP we allow using a key index as well.
1013 */
1014 if (rx->key &&
1015 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1016 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1017 !is_multicast_ether_addr(hdr->addr1))
1018 rx->key = NULL;
1019 }
571ecf67
JB		 1020 }
1021
3017b80b 1022 if (rx->key) {
571ecf67 1023 rx->key->tx_rx_count++;
011bfcc4 1024 /* TODO: add threshold stuff again */
1990af8d 1025 } else {
e4c26add 1026 return RX_DROP_MONITOR;
70f08765
JB		 1027 }
1028
39184b15
ZY		 1029 if (skb_linearize(rx->skb))
1030 return RX_DROP_UNUSABLE;
761ab470 1031 /* the hdr variable is invalid now! */
1990af8d 1032
97359d12
JB		 1033 switch (rx->key->conf.cipher) {
1034 case WLAN_CIPHER_SUITE_WEP40:
1035 case WLAN_CIPHER_SUITE_WEP104:
761ab470
JB		 1036 /* Check for weak IVs if possible */
1037 if (rx->sta && ieee80211_is_data(fc) &&
1038 (!(status->flag & RX_FLAG_IV_STRIPPED) ||
1039 !(status->flag & RX_FLAG_DECRYPTED)) &&
1040 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
1041 rx->sta->wep_weak_iv_count++;
1042
e2f036da
MN		 1043 result = ieee80211_crypto_wep_decrypt(rx);
1044 break;
97359d12 1045 case WLAN_CIPHER_SUITE_TKIP:
e2f036da
MN		 1046 result = ieee80211_crypto_tkip_decrypt(rx);
1047 break;
97359d12 1048 case WLAN_CIPHER_SUITE_CCMP:
e2f036da
MN		 1049 result = ieee80211_crypto_ccmp_decrypt(rx);
1050 break;
97359d12 1051 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 1052 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1053 break;
3ffc2a90
JB		 1054 default:
1055 /*
1056 * We can reach here only with HW-only algorithms
1057 * but why didn't it decrypt the frame?!
1058 */
1059 return RX_DROP_UNUSABLE;
70f08765
JB		 1060 }
1061
e2f036da 1062 /* either the frame has been decrypted or will be dropped */
eb9fb5b8 1063 status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 1064
1065 return result;
70f08765
JB		 1066}
1067
572e0012
KV		 1068static ieee80211_rx_result debug_noinline
1069ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1070{
1071 struct ieee80211_local *local;
1072 struct ieee80211_hdr *hdr;
1073 struct sk_buff *skb;
1074
1075 local = rx->local;
1076 skb = rx->skb;
1077 hdr = (struct ieee80211_hdr *) skb->data;
1078
1079 if (!local->pspolling)
1080 return RX_CONTINUE;
1081
1082 if (!ieee80211_has_fromds(hdr->frame_control))
1083 /* this is not from AP */
1084 return RX_CONTINUE;
1085
1086 if (!ieee80211_is_data(hdr->frame_control))
1087 return RX_CONTINUE;
1088
1089 if (!ieee80211_has_moredata(hdr->frame_control)) {
1090 /* AP has no more frames buffered for us */
1091 local->pspolling = false;
1092 return RX_CONTINUE;
1093 }
1094
1095 /* more data bit is set, let's request a new frame from the AP */
1096 ieee80211_send_pspoll(local, rx->sdata);
1097
1098 return RX_CONTINUE;
1099}
1100
133b8226 1101static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 1102{
133b8226 1103 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 1104 struct ieee80211_local *local = sdata->local;
0795af57 1105
3e122be0 1106 atomic_inc(&sdata->bss->num_sta_ps);
af818581 1107 set_sta_flags(sta, WLAN_STA_PS_STA);
12375ef9 1108 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 1109#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1110 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
47846c9b 1111 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 1112#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1113}
1114
ff9458d3 1115static void ap_sta_ps_end(struct sta_info *sta)
571ecf67 1116{
133b8226 1117 struct ieee80211_sub_if_data *sdata = sta->sdata;
571ecf67 1118
3e122be0 1119 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 1120
571ecf67 1121#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26 1122 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
47846c9b 1123 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1124#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 1125
af818581 1126 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) {
571ecf67 1127#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
af818581 1128 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n",
47846c9b 1129 sdata->name, sta->sta.addr, sta->sta.aid);
571ecf67 1130#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
af818581
JB		 1131 return;
1132 }
1133
1134 ieee80211_sta_ps_deliver_wakeup(sta);
571ecf67
JB		 1135}
1136
49461622 1137static ieee80211_rx_result debug_noinline
5cf121c3 1138ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 1139{
1140 struct sta_info *sta = rx->sta;
eb9fb5b8
JB		 1141 struct sk_buff *skb = rx->skb;
1142 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1143 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1144
1145 if (!sta)
9ae54c84 1146 return RX_CONTINUE;
571ecf67 1147
b291ba11
JB		 1148 /*
1149 * Update last_rx only for IBSS packets which are for the current
1150 * BSSID to avoid keeping the current IBSS network alive in cases
1151 * where other STAs start using different BSSID.
1152 */
05c914fe 1153 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 1154 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 1155 NL80211_IFTYPE_ADHOC);
46900298 1156 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67 1157 sta->last_rx = jiffies;
b291ba11
JB		 1158 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1159 /*
33b64eb2
LCC		 1160 * Mesh beacons will update last_rx when if they are found to
1161 * match the current local configuration when processed.
571ecf67 1162 */
b291ba11 1163 sta->last_rx = jiffies;
571ecf67
JB		 1164 }
1165
554891e6 1166 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
9ae54c84 1167 return RX_CONTINUE;
571ecf67 1168
3cf335d5
KV		 1169 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1170 ieee80211_sta_rx_notify(rx->sdata, hdr);
1171
571ecf67
JB		 1172 sta->rx_fragments++;
1173 sta->rx_bytes += rx->skb->len;
eb9fb5b8 1174 sta->last_signal = status->signal;
541a45a1 1175 ewma_add(&sta->avg_signal, -status->signal);
571ecf67 1176
72eaa43a
JB		 1177 /*
1178 * Change STA power saving mode only at the end of a frame
1179 * exchange sequence.
1180 */
3e122be0 1181 if (!ieee80211_has_morefrags(hdr->frame_control) &&
4cfda47b 1182 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
05c914fe
JB		 1183 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1184 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
af818581 1185 if (test_sta_flags(sta, WLAN_STA_PS_STA)) {
72eaa43a
JB		 1186 /*
1187 * Ignore doze->wake transitions that are
1188 * indicated by non-data frames, the standard
1189 * is unclear here, but for example going to
1190 * PS mode and then scanning would cause a
1191 * doze->wake transition for the probe request,
1192 * and that is clearly undesirable.
1193 */
1194 if (ieee80211_is_data(hdr->frame_control) &&
1195 !ieee80211_has_pm(hdr->frame_control))
ff9458d3 1196 ap_sta_ps_end(sta);
72eaa43a
JB		 1197 } else {
1198 if (ieee80211_has_pm(hdr->frame_control))
1199 ap_sta_ps_start(sta);
1200 }
571ecf67
JB		 1201 }
1202
22403def
JB		 1203 /*
1204 * Drop (qos-)data::nullfunc frames silently, since they
1205 * are used only to control station power saving mode.
1206 */
1207 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1208 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
571ecf67 1209 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
d524215f
FF		 1210
1211 /*
1212 * If we receive a 4-addr nullfunc frame from a STA
1213 * that was not moved to a 4-addr STA vlan yet, drop
1214 * the frame to the monitor interface, to make sure
1215 * that hostapd sees it
1216 */
1217 if (ieee80211_has_a4(hdr->frame_control) &&
1218 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1219 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1220 !rx->sdata->u.vlan.sta)))
1221 return RX_DROP_MONITOR;
22403def
JB		 1222 /*
1223 * Update counter and free packet here to avoid
1224 * counting this as a dropped packed.
1225 */
571ecf67
JB		 1226 sta->rx_packets++;
1227 dev_kfree_skb(rx->skb);
9ae54c84 1228 return RX_QUEUED;
571ecf67
JB		 1229 }
1230
9ae54c84 1231 return RX_CONTINUE;
571ecf67
JB		 1232} /* ieee80211_rx_h_sta_process */
1233
571ecf67
JB		 1234static inline struct ieee80211_fragment_entry *
1235ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1236 unsigned int frag, unsigned int seq, int rx_queue,
1237 struct sk_buff **skb)
1238{
1239 struct ieee80211_fragment_entry *entry;
1240 int idx;
1241
1242 idx = sdata->fragment_next;
1243 entry = &sdata->fragments[sdata->fragment_next++];
1244 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1245 sdata->fragment_next = 0;
1246
1247 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 1248#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 1249 struct ieee80211_hdr *hdr =
1250 (struct ieee80211_hdr *) entry->skb_list.next->data;
1251 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
1252 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 1253 "addr1=%pM addr2=%pM\n",
47846c9b 1254 sdata->name, idx,
571ecf67 1255 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 1256 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 1257#endif
571ecf67
JB		 1258 __skb_queue_purge(&entry->skb_list);
1259 }
1260
1261 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1262 *skb = NULL;
1263 entry->first_frag_time = jiffies;
1264 entry->seq = seq;
1265 entry->rx_queue = rx_queue;
1266 entry->last_frag = frag;
1267 entry->ccmp = 0;
1268 entry->extra_len = 0;
1269
1270 return entry;
1271}
1272
1273static inline struct ieee80211_fragment_entry *
1274ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 1275 unsigned int frag, unsigned int seq,
571ecf67
JB		 1276 int rx_queue, struct ieee80211_hdr *hdr)
1277{
1278 struct ieee80211_fragment_entry *entry;
1279 int i, idx;
1280
1281 idx = sdata->fragment_next;
1282 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1283 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 1284
1285 idx--;
1286 if (idx < 0)
1287 idx = IEEE80211_FRAGMENT_MAX - 1;
1288
1289 entry = &sdata->fragments[idx];
1290 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1291 entry->rx_queue != rx_queue ||
1292 entry->last_frag + 1 != frag)
1293 continue;
1294
b73d70ad 1295 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 1296
b73d70ad
HH		 1297 /*
1298 * Check ftype and addresses are equal, else check next fragment
1299 */
1300 if (((hdr->frame_control ^ f_hdr->frame_control) &
1301 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 1302 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
1303 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
1304 continue;
1305
ab46623e 1306 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 1307 __skb_queue_purge(&entry->skb_list);
1308 continue;
1309 }
1310 return entry;
1311 }
1312
1313 return NULL;
1314}
1315
49461622 1316static ieee80211_rx_result debug_noinline
5cf121c3 1317ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 1318{
1319 struct ieee80211_hdr *hdr;
1320 u16 sc;
358c8d9d 1321 __le16 fc;
571ecf67
JB		 1322 unsigned int frag, seq;
1323 struct ieee80211_fragment_entry *entry;
1324 struct sk_buff *skb;
554891e6 1325 struct ieee80211_rx_status *status;
571ecf67 1326
b73d70ad 1327 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1328 fc = hdr->frame_control;
571ecf67
JB		 1329 sc = le16_to_cpu(hdr->seq_ctrl);
1330 frag = sc & IEEE80211_SCTL_FRAG;
1331
358c8d9d 1332 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1333 (rx->skb)->len < 24 ||
1334 is_multicast_ether_addr(hdr->addr1))) {
1335 /* not fragmented */
1336 goto out;
1337 }
1338 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1339
e3cf8b3f
ZY		 1340 if (skb_linearize(rx->skb))
1341 return RX_DROP_UNUSABLE;
1342
058897a4
AK		 1343 /*
1344 * skb_linearize() might change the skb->data and
1345 * previously cached variables (in this case, hdr) need to
1346 * be refreshed with the new data.
1347 */
1348 hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 1349 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1350
1351 if (frag == 0) {
1352 /* This is the first fragment of a new frame. */
1353 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1354 rx->queue, &(rx->skb));
97359d12 1355 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP &&
358c8d9d 1356 ieee80211_has_protected(fc)) {
9190252c
JM		 1357 int queue = ieee80211_is_mgmt(fc) ?
1358 NUM_RX_DATA_QUEUES : rx->queue;
571ecf67
JB		 1359 /* Store CCMP PN so that we can verify that the next
1360 * fragment has a sequential PN value. */
1361 entry->ccmp = 1;
1362 memcpy(entry->last_pn,
9190252c 1363 rx->key->u.ccmp.rx_pn[queue],
571ecf67
JB		 1364 CCMP_PN_LEN);
1365 }
9ae54c84 1366 return RX_QUEUED;
571ecf67
JB		 1367 }
1368
1369 /* This is a fragment for a frame that should already be pending in
1370 * fragment cache. Add this fragment to the end of the pending entry.
1371 */
b73d70ad 1372 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1373 if (!entry) {
1374 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1375 return RX_DROP_MONITOR;
571ecf67
JB		 1376 }
1377
1378 /* Verify that MPDUs within one MSDU have sequential PN values.
1379 * (IEEE 802.11i, 8.3.3.4.5) */
1380 if (entry->ccmp) {
1381 int i;
1382 u8 pn[CCMP_PN_LEN], *rpn;
9190252c 1383 int queue;
97359d12 1384 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP)
e4c26add 1385 return RX_DROP_UNUSABLE;
571ecf67
JB		 1386 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1387 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1388 pn[i]++;
1389 if (pn[i])
1390 break;
1391 }
9190252c
JM		 1392 queue = ieee80211_is_mgmt(fc) ?
1393 NUM_RX_DATA_QUEUES : rx->queue;
1394 rpn = rx->key->u.ccmp.rx_pn[queue];
f4ea83dd 1395 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1396 return RX_DROP_UNUSABLE;
571ecf67
JB		 1397 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1398 }
1399
358c8d9d 1400 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1401 __skb_queue_tail(&entry->skb_list, rx->skb);
1402 entry->last_frag = frag;
1403 entry->extra_len += rx->skb->len;
358c8d9d 1404 if (ieee80211_has_morefrags(fc)) {
571ecf67 1405 rx->skb = NULL;
9ae54c84 1406 return RX_QUEUED;
571ecf67
JB		 1407 }
1408
1409 rx->skb = __skb_dequeue(&entry->skb_list);
1410 if (skb_tailroom(rx->skb) < entry->extra_len) {
1411 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1412 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1413 GFP_ATOMIC))) {
1414 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1415 __skb_queue_purge(&entry->skb_list);
e4c26add 1416 return RX_DROP_UNUSABLE;
571ecf67
JB		 1417 }
1418 }
1419 while ((skb = __skb_dequeue(&entry->skb_list))) {
1420 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1421 dev_kfree_skb(skb);
1422 }
1423
1424 /* Complete frame has been reassembled - process it now */
554891e6
JB		 1425 status = IEEE80211_SKB_RXCB(rx->skb);
1426 status->rx_flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1427
1428 out:
1429 if (rx->sta)
1430 rx->sta->rx_packets++;
1431 if (is_multicast_ether_addr(hdr->addr1))
1432 rx->local->dot11MulticastReceivedFrameCount++;
1433 else
1434 ieee80211_led_rx(rx->local);
9ae54c84 1435 return RX_CONTINUE;
571ecf67
JB		 1436}
1437
49461622 1438static ieee80211_rx_result debug_noinline
5cf121c3 1439ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1440{
af818581 1441 struct ieee80211_sub_if_data *sdata = rx->sdata;
358c8d9d 1442 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
554891e6 1443 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1444
358c8d9d 1445 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
554891e6 1446 !(status->rx_flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1447 return RX_CONTINUE;
571ecf67 1448
05c914fe
JB		 1449 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1450 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1451 return RX_DROP_UNUSABLE;
98f0b0a3 1452
af818581
JB		 1453 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER))
1454 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1455 else
1456 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67 1457
9ae54c84 1458 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1459 * count as an dropped frame. */
1460 dev_kfree_skb(rx->skb);
1461
9ae54c84 1462 return RX_QUEUED;
571ecf67
JB		 1463}
1464
49461622 1465static ieee80211_rx_result debug_noinline
5cf121c3 1466ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1467{
6e0d114d 1468 u8 *data = rx->skb->data;
238f74a2 1469 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1470
238f74a2 1471 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1472 return RX_CONTINUE;
6e0d114d
JB		 1473
1474 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1475 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1476 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1477 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1478 /* change frame type to non QOS */
238f74a2 1479 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1480
9ae54c84 1481 return RX_CONTINUE;
6e0d114d
JB		 1482}
1483
76ee65bf 1484static int
5cf121c3 1485ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1486{
07346f81 1487 if (unlikely(!rx->sta ||
f4ea83dd 1488 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1489 return -EACCES;
571ecf67 1490
76ee65bf 1491 return 0;
571ecf67
JB		 1492}
1493
76ee65bf 1494static int
358c8d9d 1495ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1496{
eb9fb5b8
JB		 1497 struct sk_buff *skb = rx->skb;
1498 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1499
3017b80b 1500 /*
7848ba7d
JB		 1501 * Pass through unencrypted frames if the hardware has
1502 * decrypted them already.
3017b80b 1503 */
eb9fb5b8 1504 if (status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1505 return 0;
571ecf67
JB		 1506
1507 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1508 if (unlikely(!ieee80211_has_protected(fc) &&
1509 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1510 ieee80211_is_data(fc) &&
b3fc9c6c 1511 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1512 return -EACCES;
bef5d1c7
JB		 1513
1514 return 0;
1515}
1516
1517static int
1518ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
1519{
1520 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
e3efca0a 1521 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
bef5d1c7 1522 __le16 fc = hdr->frame_control;
bef5d1c7 1523
e3efca0a
JM		 1524 /*
1525 * Pass through unencrypted frames if the hardware has
1526 * decrypted them already.
1527 */
1528 if (status->flag & RX_FLAG_DECRYPTED)
1529 return 0;
bef5d1c7 1530
f2ca3ea4 1531 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
d211e90e
JM		 1532 if (unlikely(!ieee80211_has_protected(fc) &&
1533 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1534 rx->key)) {
1535 if (ieee80211_is_deauth(fc))
1536 cfg80211_send_unprot_deauth(rx->sdata->dev,
1537 rx->skb->data,
1538 rx->skb->len);
1539 else if (ieee80211_is_disassoc(fc))
1540 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1541 rx->skb->data,
1542 rx->skb->len);
f2ca3ea4 1543 return -EACCES;
cf4e594e 1544 }
f2ca3ea4 1545 /* BIP does not use Protected field, so need to check MMIE */
f64f9e71 1546 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
cf4e594e
JM		 1547 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
1548 if (ieee80211_is_deauth(fc))
1549 cfg80211_send_unprot_deauth(rx->sdata->dev,
1550 rx->skb->data,
1551 rx->skb->len);
1552 else if (ieee80211_is_disassoc(fc))
1553 cfg80211_send_unprot_disassoc(rx->sdata->dev,
1554 rx->skb->data,
1555 rx->skb->len);
f2ca3ea4 1556 return -EACCES;
cf4e594e 1557 }
f2ca3ea4
JM		 1558 /*
1559 * When using MFP, Action frames are not allowed prior to
1560 * having configured keys.
1561 */
1562 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1563 ieee80211_is_robust_mgmt_frame(
1564 (struct ieee80211_hdr *) rx->skb->data)))
1565 return -EACCES;
1566 }
b3fc9c6c 1567
76ee65bf 1568 return 0;
571ecf67
JB		 1569}
1570
76ee65bf 1571static int
e31a16d6 1572__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67 1573{
eb9fb5b8 1574 struct ieee80211_sub_if_data *sdata = rx->sdata;
f14543ee 1575 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
fbb327c5
FF		 1576 bool check_port_control = false;
1577 struct ethhdr *ehdr;
1578 int ret;
f14543ee 1579
9bc383de
JB		 1580 if (ieee80211_has_a4(hdr->frame_control) &&
1581 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
f14543ee 1582 return -1;
9bc383de 1583
fbb327c5
FF		 1584 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1585 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
1586
1587 if (!sdata->u.mgd.use_4addr)
1588 return -1;
1589 else
1590 check_port_control = true;
1591 }
1592
9bc383de 1593 if (is_multicast_ether_addr(hdr->addr1) &&
fbb327c5 1594 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
f14543ee 1595 return -1;
571ecf67 1596
fbb327c5
FF		 1597 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
1598 if (ret < 0 || !check_port_control)
1599 return ret;
1600
1601 ehdr = (struct ethhdr *) rx->skb->data;
1602 if (ehdr->h_proto != rx->sdata->control_port_protocol)
1603 return -1;
1604
1605 return 0;
76ee65bf 1606}
571ecf67 1607
ce3edf6d
JB		 1608/*
1609 * requires that rx->skb is a frame with ethernet header
1610 */
358c8d9d 1611static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1612{
c97c23e3 1613 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1614 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1615 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1616
1617 /*
1618 * Allow EAPOL frames to us/the PAE group address regardless
1619 * of whether the frame was encrypted or not.
1620 */
a621fa4d 1621 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
47846c9b 1622 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 ||
ce3edf6d
JB		 1623 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1624 return true;
1625
1626 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1627 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1628 return false;
1629
1630 return true;
1631}
1632
1633/*
1634 * requires that rx->skb is a frame with ethernet header
1635 */
76ee65bf 1636static void
5cf121c3 1637ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf 1638{
eb9fb5b8
JB		 1639 struct ieee80211_sub_if_data *sdata = rx->sdata;
1640 struct net_device *dev = sdata->dev;
76ee65bf 1641 struct sk_buff *skb, *xmit_skb;
ce3edf6d
JB		 1642 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1643 struct sta_info *dsta;
554891e6 1644 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
571ecf67 1645
76ee65bf
RR		 1646 skb = rx->skb;
1647 xmit_skb = NULL;
571ecf67 1648
05c914fe
JB		 1649 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1650 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1651 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
554891e6 1652 (status->rx_flags & IEEE80211_RX_RA_MATCH) &&
9bc383de 1653 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
ce3edf6d
JB		 1654 if (is_multicast_ether_addr(ehdr->h_dest)) {
1655 /*
1656 * send multicast frames both to higher layers in
1657 * local net stack and back to the wireless medium
1658 */
76ee65bf
RR		 1659 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1660 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1661 printk(KERN_DEBUG "%s: failed to clone "
1662 "multicast frame\n", dev->name);
1663 } else {
abe60632
JB		 1664 dsta = sta_info_get(sdata, skb->data);
1665 if (dsta) {
ce3edf6d
JB		 1666 /*
1667 * The destination station is associated to
1668 * this AP (in this VLAN), so send the frame
1669 * directly to it and do not pass it to local
1670 * net stack.
571ecf67 1671 */
76ee65bf 1672 xmit_skb = skb;
571ecf67
JB		 1673 skb = NULL;
1674 }
571ecf67
JB		 1675 }
1676 }
1677
1678 if (skb) {
d1c3a37c
JB		 1679 int align __maybe_unused;
1680
59d9cb07 1681#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
d1c3a37c
JB		 1682 /*
1683 * 'align' will only take the values 0 or 2 here
1684 * since all frames are required to be aligned
1685 * to 2-byte boundaries when being passed to
1686 * mac80211. That also explains the __skb_push()
1687 * below.
1688 */
dacb6f1d 1689 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1690 if (align) {
1691 if (WARN_ON(skb_headroom(skb) < 3)) {
1692 dev_kfree_skb(skb);
1693 skb = NULL;
1694 } else {
1695 u8 *data = skb->data;
8ce0b589
ZY		 1696 size_t len = skb_headlen(skb);
1697 skb->data -= align;
1698 memmove(skb->data, data, len);
1699 skb_set_tail_pointer(skb, len);
d1c3a37c
JB		 1700 }
1701 }
1702#endif
1703
1704 if (skb) {
1705 /* deliver to local stack */
1706 skb->protocol = eth_type_trans(skb, dev);
1707 memset(skb->cb, 0, sizeof(skb->cb));
5548a8a1 1708 netif_receive_skb(skb);
d1c3a37c 1709 }
571ecf67
JB		 1710 }
1711
76ee65bf 1712 if (xmit_skb) {
571ecf67 1713 /* send to wireless media */
f831e909 1714 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1715 skb_reset_network_header(xmit_skb);
1716 skb_reset_mac_header(xmit_skb);
76ee65bf 1717 dev_queue_xmit(xmit_skb);
571ecf67 1718 }
76ee65bf
RR		 1719}
1720
49461622 1721static ieee80211_rx_result debug_noinline
5cf121c3 1722ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f 1723{
eb9fb5b8 1724 struct net_device *dev = rx->sdata->dev;
eaf85ca7 1725 struct sk_buff *skb = rx->skb;
358c8d9d
HH		 1726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1727 __le16 fc = hdr->frame_control;
eaf85ca7 1728 struct sk_buff_head frame_list;
554891e6 1729 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
fd4c7f2f 1730
358c8d9d 1731 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1732 return RX_CONTINUE;
fd4c7f2f 1733
358c8d9d 1734 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1735 return RX_DROP_MONITOR;
fd4c7f2f 1736
554891e6 1737 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
9ae54c84 1738 return RX_CONTINUE;
fd4c7f2f 1739
eaf85ca7
ZY		 1740 if (ieee80211_has_a4(hdr->frame_control) &&
1741 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1742 !rx->sdata->u.vlan.sta)
e4c26add 1743 return RX_DROP_UNUSABLE;
fd4c7f2f 1744
eaf85ca7
ZY		 1745 if (is_multicast_ether_addr(hdr->addr1) &&
1746 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1747 rx->sdata->u.vlan.sta) ||
1748 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
1749 rx->sdata->u.mgd.use_4addr)))
e4c26add 1750 return RX_DROP_UNUSABLE;
fd4c7f2f 1751
eaf85ca7
ZY		 1752 skb->dev = dev;
1753 __skb_queue_head_init(&frame_list);
fd4c7f2f 1754
e3cf8b3f
ZY		 1755 if (skb_linearize(skb))
1756 return RX_DROP_UNUSABLE;
1757
eaf85ca7
ZY		 1758 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
1759 rx->sdata->vif.type,
1760 rx->local->hw.extra_tx_headroom);
fd4c7f2f 1761
eaf85ca7
ZY		 1762 while (!skb_queue_empty(&frame_list)) {
1763 rx->skb = __skb_dequeue(&frame_list);
fd4c7f2f 1764
358c8d9d 1765 if (!ieee80211_frame_allowed(rx, fc)) {
eaf85ca7 1766 dev_kfree_skb(rx->skb);
ce3edf6d
JB		 1767 continue;
1768 }
eaf85ca7
ZY		 1769 dev->stats.rx_packets++;
1770 dev->stats.rx_bytes += rx->skb->len;
fd4c7f2f
RR		 1771
1772 ieee80211_deliver_skb(rx);
1773 }
1774
9ae54c84 1775 return RX_QUEUED;
fd4c7f2f
RR		 1776}
1777
bf94e17b 1778#ifdef CONFIG_MAC80211_MESH
b0dee578 1779static ieee80211_rx_result
e32f85f7
LCC		 1780ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1781{
1782 struct ieee80211_hdr *hdr;
1783 struct ieee80211s_hdr *mesh_hdr;
1784 unsigned int hdrlen;
1785 struct sk_buff *skb = rx->skb, *fwd_skb;
3b8d81e0 1786 struct ieee80211_local *local = rx->local;
eb9fb5b8 1787 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 1788 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
e32f85f7
LCC		 1789
1790 hdr = (struct ieee80211_hdr *) skb->data;
1791 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1792 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1793
1794 if (!ieee80211_is_data(hdr->frame_control))
1795 return RX_CONTINUE;
1796
1797 if (!mesh_hdr->ttl)
1798 /* illegal frame */
1799 return RX_DROP_MONITOR;
1800
43b7b314 1801 if (mesh_hdr->flags & MESH_FLAGS_AE) {
79617dee 1802 struct mesh_path *mppath;
43b7b314
JC		 1803 char *proxied_addr;
1804 char *mpp_addr;
1805
1806 if (is_multicast_ether_addr(hdr->addr1)) {
1807 mpp_addr = hdr->addr3;
1808 proxied_addr = mesh_hdr->eaddr1;
1809 } else {
1810 mpp_addr = hdr->addr4;
1811 proxied_addr = mesh_hdr->eaddr2;
1812 }
79617dee 1813
79617dee 1814 rcu_read_lock();
43b7b314 1815 mppath = mpp_path_lookup(proxied_addr, sdata);
79617dee 1816 if (!mppath) {
43b7b314 1817 mpp_path_add(proxied_addr, mpp_addr, sdata);
79617dee
Y		 1818 } else {
1819 spin_lock_bh(&mppath->state_lock);
43b7b314
JC		 1820 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0)
1821 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
79617dee
Y		 1822 spin_unlock_bh(&mppath->state_lock);
1823 }
1824 rcu_read_unlock();
1825 }
1826
3c5772a5
JC		 1827 /* Frame has reached destination. Don't forward */
1828 if (!is_multicast_ether_addr(hdr->addr1) &&
47846c9b 1829 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0)
e32f85f7
LCC		 1830 return RX_CONTINUE;
1831
1832 mesh_hdr->ttl--;
1833
554891e6 1834 if (status->rx_flags & IEEE80211_RX_RA_MATCH) {
e32f85f7 1835 if (!mesh_hdr->ttl)
472dbc45 1836 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1837 dropped_frames_ttl);
1838 else {
1839 struct ieee80211_hdr *fwd_hdr;
3b8d81e0
JB		 1840 struct ieee80211_tx_info *info;
1841
e32f85f7
LCC		 1842 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1843
1844 if (!fwd_skb && net_ratelimit())
1845 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
47846c9b 1846 sdata->name);
919bbad5 1847 if (!fwd_skb)
b51aff05 1848 goto out;
e32f85f7
LCC		 1849
1850 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
47846c9b 1851 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
3b8d81e0
JB		 1852 info = IEEE80211_SKB_CB(fwd_skb);
1853 memset(info, 0, sizeof(*info));
1854 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
5061b0c2 1855 info->control.vif = &rx->sdata->vif;
cf0277e7
JB		 1856 skb_set_queue_mapping(skb,
1857 ieee80211_select_queue(rx->sdata, fwd_skb));
1858 ieee80211_set_qos_hdr(local, skb);
c8a61a7d
DW		 1859 if (is_multicast_ether_addr(fwd_hdr->addr1))
1860 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1861 fwded_mcast);
1862 else {
3c5772a5
JC		 1863 int err;
1864 /*
1865 * Save TA to addr1 to send TA a path error if a
1866 * suitable next hop is not found
1867 */
1868 memcpy(fwd_hdr->addr1, fwd_hdr->addr2,
249b405c 1869 ETH_ALEN);
3c5772a5 1870 err = mesh_nexthop_lookup(fwd_skb, sdata);
249b405c
JC		 1871 /* Failed to immediately resolve next hop:
1872 * fwded frame was dropped or will be added
1873 * later to the pending skb queue. */
1874 if (err)
1875 return RX_DROP_MONITOR;
c8a61a7d
DW		 1876
1877 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1878 fwded_unicast);
249b405c
JC		 1879 }
1880 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh,
1881 fwded_frames);
3b8d81e0 1882 ieee80211_add_pending_skb(local, fwd_skb);
e32f85f7
LCC		 1883 }
1884 }
1885
b51aff05 1886 out:
3c5772a5 1887 if (is_multicast_ether_addr(hdr->addr1) ||
eb9fb5b8 1888 sdata->dev->flags & IFF_PROMISC)
e32f85f7
LCC		 1889 return RX_CONTINUE;
1890 else
1891 return RX_DROP_MONITOR;
1892}
bf94e17b 1893#endif
e32f85f7 1894
49461622 1895static ieee80211_rx_result debug_noinline
5cf121c3 1896ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf 1897{
eb9fb5b8 1898 struct ieee80211_sub_if_data *sdata = rx->sdata;
e15276a4 1899 struct ieee80211_local *local = rx->local;
eb9fb5b8 1900 struct net_device *dev = sdata->dev;
358c8d9d
HH		 1901 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1902 __le16 fc = hdr->frame_control;
ce3edf6d 1903 int err;
76ee65bf 1904
358c8d9d 1905 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1906 return RX_CONTINUE;
76ee65bf 1907
358c8d9d 1908 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1909 return RX_DROP_MONITOR;
76ee65bf 1910
f14543ee
FF		 1911 /*
1912 * Allow the cooked monitor interface of an AP to see 4-addr frames so
1913 * that a 4-addr station can be detected and moved into a separate VLAN
1914 */
1915 if (ieee80211_has_a4(hdr->frame_control) &&
1916 sdata->vif.type == NL80211_IFTYPE_AP)
1917 return RX_DROP_MONITOR;
1918
e31a16d6 1919 err = __ieee80211_data_to_8023(rx);
76ee65bf 1920 if (unlikely(err))
e4c26add 1921 return RX_DROP_UNUSABLE;
76ee65bf 1922
358c8d9d 1923 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1924 return RX_DROP_MONITOR;
ce3edf6d 1925
76ee65bf
RR		 1926 rx->skb->dev = dev;
1927
1928 dev->stats.rx_packets++;
1929 dev->stats.rx_bytes += rx->skb->len;
1930
08ca944e
HS		 1931 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
1932 !is_multicast_ether_addr(((struct ethhdr *)rx->skb->data)->h_dest)) {
e15276a4
VN		 1933 mod_timer(&local->dynamic_ps_timer, jiffies +
1934 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
1935 }
1936
76ee65bf 1937 ieee80211_deliver_skb(rx);
571ecf67 1938
9ae54c84 1939 return RX_QUEUED;
571ecf67
JB		 1940}
1941
49461622 1942static ieee80211_rx_result debug_noinline
24a8fdad 1943ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1944{
1945 struct ieee80211_local *local = rx->local;
1946 struct ieee80211_hw *hw = &local->hw;
1947 struct sk_buff *skb = rx->skb;
a7767f95 1948 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1949 struct tid_ampdu_rx *tid_agg_rx;
1950 u16 start_seq_num;
1951 u16 tid;
1952
a7767f95 1953 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1954 return RX_CONTINUE;
71364716 1955
a7767f95 1956 if (ieee80211_is_back_req(bar->frame_control)) {
8ae5977f
JB		 1957 struct {
1958 __le16 control, start_seq_num;
1959 } __packed bar_data;
1960
71364716 1961 if (!rx->sta)
a02ae758 1962 return RX_DROP_MONITOR;
8ae5977f
JB		 1963
1964 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
1965 &bar_data, sizeof(bar_data)))
1966 return RX_DROP_MONITOR;
1967
8ae5977f 1968 tid = le16_to_cpu(bar_data.control) >> 12;
a87f736d
JB		 1969
1970 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
1971 if (!tid_agg_rx)
a02ae758 1972 return RX_DROP_MONITOR;
71364716 1973
8ae5977f 1974 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
71364716
RR		 1975
1976 /* reset session timer */
20ad19d0
JB		 1977 if (tid_agg_rx->timeout)
1978 mod_timer(&tid_agg_rx->session_timer,
1979 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716 1980
dd318575 1981 spin_lock(&tid_agg_rx->reorder_lock);
a02ae758 1982 /* release stored frames up to start of BAR */
24a8fdad 1983 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num);
dd318575
JB		 1984 spin_unlock(&tid_agg_rx->reorder_lock);
1985
a02ae758
JB		 1986 kfree_skb(skb);
1987 return RX_QUEUED;
71364716
RR		 1988 }
1989
08daecae
JB		 1990 /*
1991 * After this point, we only want management frames,
1992 * so we can drop all remaining control frames to
1993 * cooked monitor interfaces.
1994 */
1995 return RX_DROP_MONITOR;
71364716
RR		 1996}
1997
f4f727a6
JM		 1998static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1999 struct ieee80211_mgmt *mgmt,
2000 size_t len)
fea14732
JM		 2001{
2002 struct ieee80211_local *local = sdata->local;
2003 struct sk_buff *skb;
2004 struct ieee80211_mgmt *resp;
2005
47846c9b 2006 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) {
fea14732
JM		 2007 /* Not to own unicast address */
2008 return;
2009 }
2010
46900298
JB		 2011 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
2012 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 2013 /* Not from the current AP or not associated yet. */
fea14732
JM		 2014 return;
2015 }
2016
2017 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2018 /* Too short SA Query request frame */
2019 return;
2020 }
2021
2022 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2023 if (skb == NULL)
2024 return;
2025
2026 skb_reserve(skb, local->hw.extra_tx_headroom);
2027 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2028 memset(resp, 0, 24);
2029 memcpy(resp->da, mgmt->sa, ETH_ALEN);
47846c9b 2030 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
46900298 2031 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 2032 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2033 IEEE80211_STYPE_ACTION);
2034 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2035 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2036 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2037 memcpy(resp->u.action.u.sa_query.trans_id,
2038 mgmt->u.action.u.sa_query.trans_id,
2039 WLAN_SA_QUERY_TR_ID_LEN);
2040
62ae67be 2041 ieee80211_tx_skb(sdata, skb);
fea14732
JM		 2042}
2043
2e161f78
JB		 2044static ieee80211_rx_result debug_noinline
2045ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2046{
2047 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2048 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2049
2050 /*
2051 * From here on, look only at management frames.
2052 * Data and control frames are already handled,
2053 * and unknown (reserved) frames are useless.
2054 */
2055 if (rx->skb->len < 24)
2056 return RX_DROP_MONITOR;
2057
2058 if (!ieee80211_is_mgmt(mgmt->frame_control))
2059 return RX_DROP_MONITOR;
2060
554891e6 2061 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
2e161f78
JB		 2062 return RX_DROP_MONITOR;
2063
2064 if (ieee80211_drop_unencrypted_mgmt(rx))
2065 return RX_DROP_UNUSABLE;
2066
2067 return RX_CONTINUE;
2068}
2069
de1ede7a
JB		 2070static ieee80211_rx_result debug_noinline
2071ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2072{
2073 struct ieee80211_local *local = rx->local;
eb9fb5b8 2074 struct ieee80211_sub_if_data *sdata = rx->sdata;
de1ede7a 2075 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
554891e6 2076 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
de1ede7a
JB		 2077 int len = rx->skb->len;
2078
2079 if (!ieee80211_is_action(mgmt->frame_control))
2080 return RX_CONTINUE;
2081
026331c4
JM		 2082 /* drop too small frames */
2083 if (len < IEEE80211_MIN_ACTION_SIZE)
84040805 2084 return RX_DROP_UNUSABLE;
de1ede7a 2085
026331c4 2086 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
84040805 2087 return RX_DROP_UNUSABLE;
de1ede7a 2088
554891e6 2089 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
84040805 2090 return RX_DROP_UNUSABLE;
97ebe12a 2091
de1ede7a
JB		 2092 switch (mgmt->u.action.category) {
2093 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 2094 /*
2095 * The aggregation code is not prepared to handle
2096 * anything but STA/AP due to the BSSID handling;
2097 * IBSS could work in the code but isn't supported
2098 * by drivers or the standard.
2099 */
2100 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2101 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2102 sdata->vif.type != NL80211_IFTYPE_AP)
84040805 2103 break;
8abd3f9b 2104
026331c4
JM		 2105 /* verify action_code is present */
2106 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2107 break;
2108
de1ede7a
JB		 2109 switch (mgmt->u.action.u.addba_req.action_code) {
2110 case WLAN_ACTION_ADDBA_REQ:
2111 if (len < (IEEE80211_MIN_ACTION_SIZE +
2112 sizeof(mgmt->u.action.u.addba_req)))
bed7ee6e
JB		 2113 goto invalid;
2114 break;
de1ede7a
JB		 2115 case WLAN_ACTION_ADDBA_RESP:
2116 if (len < (IEEE80211_MIN_ACTION_SIZE +
2117 sizeof(mgmt->u.action.u.addba_resp)))
bed7ee6e
JB		 2118 goto invalid;
2119 break;
de1ede7a
JB		 2120 case WLAN_ACTION_DELBA:
2121 if (len < (IEEE80211_MIN_ACTION_SIZE +
2122 sizeof(mgmt->u.action.u.delba)))
bed7ee6e
JB		 2123 goto invalid;
2124 break;
2125 default:
2126 goto invalid;
de1ede7a 2127 }
bed7ee6e 2128
8b58ff83 2129 goto queue;
39192c0b
JB		 2130 case WLAN_CATEGORY_SPECTRUM_MGMT:
2131 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
84040805 2132 break;
46900298
JB		 2133
2134 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2135 break;
46900298 2136
026331c4
JM		 2137 /* verify action_code is present */
2138 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2139 break;
2140
39192c0b
JB		 2141 switch (mgmt->u.action.u.measurement.action_code) {
2142 case WLAN_ACTION_SPCT_MSR_REQ:
2143 if (len < (IEEE80211_MIN_ACTION_SIZE +
2144 sizeof(mgmt->u.action.u.measurement)))
84040805 2145 break;
39192c0b 2146 ieee80211_process_measurement_req(sdata, mgmt, len);
84040805 2147 goto handled;
c481ec97
S		 2148 case WLAN_ACTION_SPCT_CHL_SWITCH:
2149 if (len < (IEEE80211_MIN_ACTION_SIZE +
2150 sizeof(mgmt->u.action.u.chan_switch)))
84040805 2151 break;
c481ec97 2152
cc32abd4 2153 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2154 break;
cc32abd4 2155
46900298 2156 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
84040805 2157 break;
c481ec97 2158
8b58ff83 2159 goto queue;
39192c0b
JB		 2160 }
2161 break;
fea14732
JM		 2162 case WLAN_CATEGORY_SA_QUERY:
2163 if (len < (IEEE80211_MIN_ACTION_SIZE +
2164 sizeof(mgmt->u.action.u.sa_query)))
84040805
JB		 2165 break;
2166
fea14732
JM		 2167 switch (mgmt->u.action.u.sa_query.action) {
2168 case WLAN_ACTION_SA_QUERY_REQUEST:
2169 if (sdata->vif.type != NL80211_IFTYPE_STATION)
84040805 2170 break;
fea14732 2171 ieee80211_process_sa_query_req(sdata, mgmt, len);
84040805 2172 goto handled;
fea14732
JM		 2173 }
2174 break;
97ad9139 2175 case WLAN_CATEGORY_MESH_PLINK:
77a121c3
JB		 2176 if (!ieee80211_vif_is_mesh(&sdata->vif))
2177 break;
8b58ff83 2178 goto queue;
c7108a71
JC		 2179 case WLAN_CATEGORY_MESH_PATH_SEL:
2180 if (!mesh_path_sel_is_hwmp(sdata))
2181 break;
2182 goto queue;
84040805 2183 }
026331c4 2184
2e161f78
JB		 2185 return RX_CONTINUE;
2186
bed7ee6e 2187 invalid:
554891e6 2188 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
2e161f78
JB		 2189 /* will return in the next handlers */
2190 return RX_CONTINUE;
2191
2192 handled:
2193 if (rx->sta)
2194 rx->sta->rx_packets++;
2195 dev_kfree_skb(rx->skb);
2196 return RX_QUEUED;
2197
2198 queue:
2199 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2200 skb_queue_tail(&sdata->skb_queue, rx->skb);
2201 ieee80211_queue_work(&local->hw, &sdata->work);
2202 if (rx->sta)
2203 rx->sta->rx_packets++;
2204 return RX_QUEUED;
2205}
2206
2207static ieee80211_rx_result debug_noinline
2208ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2209{
554891e6 2210 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2211
2212 /* skip known-bad action frames and return them in the next handler */
554891e6 2213 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
2e161f78 2214 return RX_CONTINUE;
d7907448 2215
026331c4
JM		 2216 /*
2217 * Getting here means the kernel doesn't know how to handle
2218 * it, but maybe userspace does ... include returned frames
2219 * so userspace can register for those to know whether ones
2220 * it transmitted were processed or returned.
2221 */
026331c4 2222
2e161f78
JB		 2223 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
2224 rx->skb->data, rx->skb->len,
2225 GFP_ATOMIC)) {
2226 if (rx->sta)
2227 rx->sta->rx_packets++;
2228 dev_kfree_skb(rx->skb);
2229 return RX_QUEUED;
2230 }
2231
2232
2233 return RX_CONTINUE;
2234}
2235
2236static ieee80211_rx_result debug_noinline
2237ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2238{
2239 struct ieee80211_local *local = rx->local;
2240 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2241 struct sk_buff *nskb;
2242 struct ieee80211_sub_if_data *sdata = rx->sdata;
554891e6 2243 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
2e161f78
JB		 2244
2245 if (!ieee80211_is_action(mgmt->frame_control))
2246 return RX_CONTINUE;
2247
2248 /*
2249 * For AP mode, hostapd is responsible for handling any action
2250 * frames that we didn't handle, including returning unknown
2251 * ones. For all other modes we will return them to the sender,
2252 * setting the 0x80 bit in the action category, as required by
2253 * 802.11-2007 7.3.1.11.
2254 * Newer versions of hostapd shall also use the management frame
2255 * registration mechanisms, but older ones still use cooked
2256 * monitor interfaces so push all frames there.
2257 */
554891e6 2258 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
2e161f78
JB		 2259 (sdata->vif.type == NL80211_IFTYPE_AP ||
2260 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2261 return RX_DROP_MONITOR;
026331c4 2262
84040805
JB		 2263 /* do not return rejected action frames */
2264 if (mgmt->u.action.category & 0x80)
2265 return RX_DROP_UNUSABLE;
2266
2267 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2268 GFP_ATOMIC);
2269 if (nskb) {
292b4df6 2270 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
84040805 2271
292b4df6
JL		 2272 nmgmt->u.action.category |= 0x80;
2273 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2274 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
84040805
JB		 2275
2276 memset(nskb->cb, 0, sizeof(nskb->cb));
2277
2278 ieee80211_tx_skb(rx->sdata, nskb);
de1ede7a 2279 }
39192c0b
JB		 2280 dev_kfree_skb(rx->skb);
2281 return RX_QUEUED;
de1ede7a
JB		 2282}
2283
49461622 2284static ieee80211_rx_result debug_noinline
5cf121c3 2285ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 2286{
eb9fb5b8 2287 struct ieee80211_sub_if_data *sdata = rx->sdata;
af6b6374 2288 ieee80211_rx_result rxs;
77a121c3
JB		 2289 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2290 __le16 stype;
571ecf67 2291
af6b6374
JB		 2292 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb);
2293 if (rxs != RX_CONTINUE)
2294 return rxs;
2295
77a121c3 2296 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
472dbc45 2297
77a121c3
JB		 2298 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2299 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2300 sdata->vif.type != NL80211_IFTYPE_STATION)
2301 return RX_DROP_MONITOR;
472dbc45 2302
77a121c3
JB		 2303 switch (stype) {
2304 case cpu_to_le16(IEEE80211_STYPE_BEACON):
2305 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
2306 /* process for all: mesh, mlme, ibss */
2307 break;
2308 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
2309 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
2c31333a
CL		 2310 if (is_multicast_ether_addr(mgmt->da) &&
2311 !is_broadcast_ether_addr(mgmt->da))
2312 return RX_DROP_MONITOR;
2313
77a121c3
JB		 2314 /* process only for station */
2315 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2316 return RX_DROP_MONITOR;
2317 break;
2318 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
2319 case cpu_to_le16(IEEE80211_STYPE_AUTH):
2320 /* process only for ibss */
2321 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
2322 return RX_DROP_MONITOR;
2323 break;
2324 default:
2325 return RX_DROP_MONITOR;
2326 }
f9d540ee 2327
77a121c3 2328 /* queue up frame and kick off work to process it */
c1475ca9 2329 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
77a121c3
JB		 2330 skb_queue_tail(&sdata->skb_queue, rx->skb);
2331 ieee80211_queue_work(&rx->local->hw, &sdata->work);
8b58ff83
JB		 2332 if (rx->sta)
2333 rx->sta->rx_packets++;
46900298 2334
77a121c3 2335 return RX_QUEUED;
571ecf67
JB		 2336}
2337
3b8d81e0 2338static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr,
5cf121c3 2339 struct ieee80211_rx_data *rx)
571ecf67 2340{
a7767f95
HH		 2341 int keyidx;
2342 unsigned int hdrlen;
571ecf67 2343
a7767f95 2344 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 2345 if (rx->skb->len >= hdrlen + 4)
2346 keyidx = rx->skb->data[hdrlen + 3] >> 6;
2347 else
2348 keyidx = -1;
2349
8944b79f 2350 if (!rx->sta) {
aa0daf0e
JB		 2351 /*
2352 * Some hardware seem to generate incorrect Michael MIC
2353 * reports; ignore them to avoid triggering countermeasures.
2354 */
af2ced6a 2355 return;
571ecf67
JB		 2356 }
2357
a7767f95 2358 if (!ieee80211_has_protected(hdr->frame_control))
af2ced6a 2359 return;
571ecf67 2360
05c914fe 2361 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 2362 /*
2363 * APs with pairwise keys should never receive Michael MIC
2364 * errors for non-zero keyidx because these are reserved for
2365 * group keys and only the AP is sending real multicast
2366 * frames in the BSS.
2367 */
af2ced6a 2368 return;
571ecf67
JB		 2369 }
2370
a7767f95
HH		 2371 if (!ieee80211_is_data(hdr->frame_control) &&
2372 !ieee80211_is_auth(hdr->frame_control))
af2ced6a 2373 return;
571ecf67 2374
e6d6e342
JB		 2375 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
2376 GFP_ATOMIC);
571ecf67
JB		 2377}
2378
5cf121c3 2379/* TODO: use IEEE80211_RX_FRAGMENTED */
5f0b7de5
JB		 2380static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
2381 struct ieee80211_rate *rate)
3d30d949
MW		 2382{
2383 struct ieee80211_sub_if_data *sdata;
2384 struct ieee80211_local *local = rx->local;
2385 struct ieee80211_rtap_hdr {
2386 struct ieee80211_radiotap_header hdr;
2387 u8 flags;
5f0b7de5 2388 u8 rate_or_pad;
3d30d949
MW		 2389 __le16 chan_freq;
2390 __le16 chan_flags;
bc10502d 2391 } __packed *rthdr;
3d30d949
MW		 2392 struct sk_buff *skb = rx->skb, *skb2;
2393 struct net_device *prev_dev = NULL;
eb9fb5b8 2394 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3d30d949 2395
554891e6
JB		 2396 /*
2397 * If cooked monitor has been processed already, then
2398 * don't do it again. If not, set the flag.
2399 */
2400 if (rx->flags & IEEE80211_RX_CMNTR)
7c1e1831 2401 goto out_free_skb;
554891e6 2402 rx->flags |= IEEE80211_RX_CMNTR;
7c1e1831 2403
3d30d949
MW		 2404 if (skb_headroom(skb) < sizeof(*rthdr) &&
2405 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
2406 goto out_free_skb;
2407
2408 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
2409 memset(rthdr, 0, sizeof(*rthdr));
2410 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2411 rthdr->hdr.it_present =
2412 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3d30d949
MW		 2413 (1 << IEEE80211_RADIOTAP_CHANNEL));
2414
5f0b7de5
JB		 2415 if (rate) {
2416 rthdr->rate_or_pad = rate->bitrate / 5;
2417 rthdr->hdr.it_present |=
2418 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
2419 }
3d30d949
MW		 2420 rthdr->chan_freq = cpu_to_le16(status->freq);
2421
2422 if (status->band == IEEE80211_BAND_5GHZ)
2423 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
2424 IEEE80211_CHAN_5GHZ);
2425 else
2426 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
2427 IEEE80211_CHAN_2GHZ);
2428
2429 skb_set_mac_header(skb, 0);
2430 skb->ip_summed = CHECKSUM_UNNECESSARY;
2431 skb->pkt_type = PACKET_OTHERHOST;
2432 skb->protocol = htons(ETH_P_802_2);
2433
2434 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
9607e6b6 2435 if (!ieee80211_sdata_running(sdata))
3d30d949
MW		 2436 continue;
2437
05c914fe 2438 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 2439 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
2440 continue;
2441
2442 if (prev_dev) {
2443 skb2 = skb_clone(skb, GFP_ATOMIC);
2444 if (skb2) {
2445 skb2->dev = prev_dev;
5548a8a1 2446 netif_receive_skb(skb2);
3d30d949
MW		 2447 }
2448 }
2449
2450 prev_dev = sdata->dev;
2451 sdata->dev->stats.rx_packets++;
2452 sdata->dev->stats.rx_bytes += skb->len;
2453 }
2454
2455 if (prev_dev) {
2456 skb->dev = prev_dev;
5548a8a1 2457 netif_receive_skb(skb);
554891e6
JB		 2458 return;
2459 }
3d30d949
MW		 2460
2461 out_free_skb:
2462 dev_kfree_skb(skb);
2463}
2464
aa0c8636
CL		 2465static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
2466 ieee80211_rx_result res)
2467{
2468 switch (res) {
2469 case RX_DROP_MONITOR:
2470 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2471 if (rx->sta)
2472 rx->sta->rx_dropped++;
2473 /* fall through */
2474 case RX_CONTINUE: {
2475 struct ieee80211_rate *rate = NULL;
2476 struct ieee80211_supported_band *sband;
2477 struct ieee80211_rx_status *status;
2478
2479 status = IEEE80211_SKB_RXCB((rx->skb));
2480
2481 sband = rx->local->hw.wiphy->bands[status->band];
2482 if (!(status->flag & RX_FLAG_HT))
2483 rate = &sband->bitrates[status->rate_idx];
2484
2485 ieee80211_rx_cooked_monitor(rx, rate);
2486 break;
2487 }
2488 case RX_DROP_UNUSABLE:
2489 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
2490 if (rx->sta)
2491 rx->sta->rx_dropped++;
2492 dev_kfree_skb(rx->skb);
2493 break;
2494 case RX_QUEUED:
2495 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
2496 break;
2497 }
2498}
571ecf67 2499
24a8fdad 2500static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx)
58905290 2501{
58905290 2502 ieee80211_rx_result res = RX_DROP_MONITOR;
aa0c8636 2503 struct sk_buff *skb;
8944b79f 2504
e32f85f7
LCC		 2505#define CALL_RXH(rxh) \
2506 do { \
2507 res = rxh(rx); \
2508 if (res != RX_CONTINUE) \
2569a826 2509 goto rxh_next; \
e32f85f7 2510 } while (0);
49461622 2511
24a8fdad
CL		 2512 spin_lock(&rx->local->rx_skb_queue.lock);
2513 if (rx->local->running_rx_handler)
2514 goto unlock;
2515
2516 rx->local->running_rx_handler = true;
2517
2518 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) {
2519 spin_unlock(&rx->local->rx_skb_queue.lock);
2520
2569a826
JB		 2521 /*
2522 * all the other fields are valid across frames
2523 * that belong to an aMPDU since they are on the
2524 * same TID from the same station
2525 */
2526 rx->skb = skb;
554891e6 2527 rx->flags = 0;
2569a826
JB		 2528
2529 CALL_RXH(ieee80211_rx_h_decrypt)
2530 CALL_RXH(ieee80211_rx_h_check_more_data)
2531 CALL_RXH(ieee80211_rx_h_sta_process)
2532 CALL_RXH(ieee80211_rx_h_defragment)
2533 CALL_RXH(ieee80211_rx_h_ps_poll)
2534 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
2535 /* must be after MMIC verify so header is counted in MPDU mic */
2536 CALL_RXH(ieee80211_rx_h_remove_qos_control)
2537 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 2538#ifdef CONFIG_MAC80211_MESH
aa0c8636 2539 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
2569a826 2540 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 2541#endif
2569a826 2542 CALL_RXH(ieee80211_rx_h_data)
24a8fdad 2543 CALL_RXH(ieee80211_rx_h_ctrl);
2e161f78 2544 CALL_RXH(ieee80211_rx_h_mgmt_check)
2569a826 2545 CALL_RXH(ieee80211_rx_h_action)
2e161f78
JB		 2546 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
2547 CALL_RXH(ieee80211_rx_h_action_return)
2569a826 2548 CALL_RXH(ieee80211_rx_h_mgmt)
49461622 2549
aa0c8636
CL		 2550 rxh_next:
2551 ieee80211_rx_handlers_result(rx, res);
24a8fdad 2552 spin_lock(&rx->local->rx_skb_queue.lock);
49461622 2553#undef CALL_RXH
aa0c8636 2554 }
24a8fdad
CL		 2555
2556 rx->local->running_rx_handler = false;
2557
2558 unlock:
2559 spin_unlock(&rx->local->rx_skb_queue.lock);
aa0c8636
CL		 2560}
2561
4406c376 2562static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
aa0c8636 2563{
aa0c8636
CL		 2564 ieee80211_rx_result res = RX_DROP_MONITOR;
2565
aa0c8636
CL		 2566#define CALL_RXH(rxh) \
2567 do { \
2568 res = rxh(rx); \
2569 if (res != RX_CONTINUE) \
2570 goto rxh_next; \
2571 } while (0);
2572
2573 CALL_RXH(ieee80211_rx_h_passive_scan)
2574 CALL_RXH(ieee80211_rx_h_check)
2575
24a8fdad 2576 ieee80211_rx_reorder_ampdu(rx);
aa0c8636 2577
24a8fdad 2578 ieee80211_rx_handlers(rx);
aa0c8636 2579 return;
49461622 2580
2569a826 2581 rxh_next:
aa0c8636
CL		 2582 ieee80211_rx_handlers_result(rx, res);
2583
2584#undef CALL_RXH
58905290
JB		 2585}
2586
2bff8ebf 2587/*
dd318575
JB		 2588 * This function makes calls into the RX path, therefore
2589 * it has to be invoked under RCU read lock.
2bff8ebf
CL		 2590 */
2591void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
2592{
554891e6
JB		 2593 struct ieee80211_rx_data rx = {
2594 .sta = sta,
2595 .sdata = sta->sdata,
2596 .local = sta->local,
2597 .queue = tid,
2598 };
2c15a0cf
CL		 2599 struct tid_ampdu_rx *tid_agg_rx;
2600
2601 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
2602 if (!tid_agg_rx)
2603 return;
2bff8ebf 2604
2c15a0cf 2605 spin_lock(&tid_agg_rx->reorder_lock);
24a8fdad 2606 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx);
2c15a0cf 2607 spin_unlock(&tid_agg_rx->reorder_lock);
2bff8ebf 2608
24a8fdad 2609 ieee80211_rx_handlers(&rx);
2bff8ebf
CL		 2610}
2611
571ecf67
JB		 2612/* main receive path */
2613
20b01f80 2614static int prepare_for_handlers(struct ieee80211_rx_data *rx,
23a24def
JB		 2615 struct ieee80211_hdr *hdr)
2616{
20b01f80 2617 struct ieee80211_sub_if_data *sdata = rx->sdata;
eb9fb5b8
JB		 2618 struct sk_buff *skb = rx->skb;
2619 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2620 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
23a24def
JB		 2621 int multicast = is_multicast_ether_addr(hdr->addr1);
2622
51fb61e7 2623 switch (sdata->vif.type) {
05c914fe 2624 case NL80211_IFTYPE_STATION:
9bc383de 2625 if (!bssid && !sdata->u.mgd.use_4addr)
23a24def 2626 return 0;
77fdaa12 2627 if (!multicast &&
47846c9b 2628 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
4150c572 2629 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2630 return 0;
554891e6 2631 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2632 }
2633 break;
05c914fe 2634 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2635 if (!bssid)
2636 return 0;
a7767f95 2637 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2638 return 1;
87291c02 2639 }
46900298 2640 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
554891e6 2641 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2642 return 0;
554891e6 2643 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2644 } else if (!multicast &&
47846c9b 2645 compare_ether_addr(sdata->vif.addr,
23a24def 2646 hdr->addr1) != 0) {
4150c572 2647 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2648 return 0;
554891e6 2649 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2650 } else if (!rx->sta) {
2651 int rate_idx;
eb9fb5b8 2652 if (status->flag & RX_FLAG_HT)
0fb8ca45
JM		 2653 rate_idx = 0; /* TODO: HT rates */
2654 else
eb9fb5b8 2655 rate_idx = status->rate_idx;
34e89507
JB		 2656 rx->sta = ieee80211_ibss_add_sta(sdata, bssid,
2657 hdr->addr2, BIT(rate_idx), GFP_ATOMIC);
0fb8ca45 2658 }
23a24def 2659 break;
05c914fe 2660 case NL80211_IFTYPE_MESH_POINT:
6032f934 2661 if (!multicast &&
47846c9b 2662 compare_ether_addr(sdata->vif.addr,
6032f934
JB		 2663 hdr->addr1) != 0) {
2664 if (!(sdata->dev->flags & IFF_PROMISC))
2665 return 0;
2666
554891e6 2667 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2668 }
2669 break;
05c914fe
JB		 2670 case NL80211_IFTYPE_AP_VLAN:
2671 case NL80211_IFTYPE_AP:
23a24def 2672 if (!bssid) {
47846c9b 2673 if (compare_ether_addr(sdata->vif.addr,
23a24def
JB		 2674 hdr->addr1))
2675 return 0;
2676 } else if (!ieee80211_bssid_match(bssid,
47846c9b 2677 sdata->vif.addr)) {
554891e6 2678 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN))
23a24def 2679 return 0;
554891e6 2680 status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2681 }
23a24def 2682 break;
05c914fe 2683 case NL80211_IFTYPE_WDS:
a7767f95 2684 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2685 return 0;
2686 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2687 return 0;
2688 break;
2ca27bcf 2689 default:
fb1c1cd6
JB		 2690 /* should never get here */
2691 WARN_ON(1);
2692 break;
23a24def
JB		 2693 }
2694
2695 return 1;
2696}
2697
4406c376
JB		 2698/*
2699 * This function returns whether or not the SKB
2700 * was destined for RX processing or not, which,
2701 * if consume is true, is equivalent to whether
2702 * or not the skb was consumed.
2703 */
2704static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
2705 struct sk_buff *skb, bool consume)
2706{
2707 struct ieee80211_local *local = rx->local;
2708 struct ieee80211_sub_if_data *sdata = rx->sdata;
2709 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
2710 struct ieee80211_hdr *hdr = (void *)skb->data;
2711 int prepares;
2712
2713 rx->skb = skb;
554891e6 2714 status->rx_flags |= IEEE80211_RX_RA_MATCH;
4406c376
JB		 2715 prepares = prepare_for_handlers(rx, hdr);
2716
2717 if (!prepares)
2718 return false;
2719
2720 if (status->flag & RX_FLAG_MMIC_ERROR) {
554891e6 2721 if (status->rx_flags & IEEE80211_RX_RA_MATCH)
4406c376
JB		 2722 ieee80211_rx_michael_mic_report(hdr, rx);
2723 return false;
2724 }
2725
2726 if (!consume) {
2727 skb = skb_copy(skb, GFP_ATOMIC);
2728 if (!skb) {
2729 if (net_ratelimit())
2730 wiphy_debug(local->hw.wiphy,
b305dae4 2731 "failed to copy skb for %s\n",
4406c376
JB		 2732 sdata->name);
2733 return true;
2734 }
2735
2736 rx->skb = skb;
2737 }
2738
2739 ieee80211_invoke_rx_handlers(rx);
2740 return true;
2741}
2742
571ecf67 2743/*
6368e4b1
RR		 2744 * This is the actual Rx frames handler. as it blongs to Rx path it must
2745 * be called with rcu_read_lock protection.
571ecf67 2746 */
71ebb4aa 2747static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
071d9ac2 2748 struct sk_buff *skb)
571ecf67 2749{
554891e6 2750 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2751 struct ieee80211_local *local = hw_to_local(hw);
2752 struct ieee80211_sub_if_data *sdata;
571ecf67 2753 struct ieee80211_hdr *hdr;
e3cf8b3f 2754 __le16 fc;
5cf121c3 2755 struct ieee80211_rx_data rx;
4406c376 2756 struct ieee80211_sub_if_data *prev;
56af3268 2757 struct sta_info *sta, *tmp, *prev_sta;
e3cf8b3f 2758 int err = 0;
571ecf67 2759
e3cf8b3f 2760 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
571ecf67
JB		 2761 memset(&rx, 0, sizeof(rx));
2762 rx.skb = skb;
2763 rx.local = local;
72abd81b 2764
e3cf8b3f 2765 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
571ecf67 2766 local->dot11ReceivedFragmentCount++;
571ecf67 2767
142b9f50
HS		 2768 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
2769 test_bit(SCAN_OFF_CHANNEL, &local->scanning)))
554891e6 2770 status->rx_flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2771
e3cf8b3f
ZY		 2772 if (ieee80211_is_mgmt(fc))
2773 err = skb_linearize(skb);
2774 else
2775 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
2776
2777 if (err) {
2778 dev_kfree_skb(skb);
2779 return;
2780 }
2781
2782 hdr = (struct ieee80211_hdr *)skb->data;
38f3714d 2783 ieee80211_parse_qos(&rx);
d1c3a37c 2784 ieee80211_verify_alignment(&rx);
38f3714d 2785
e3cf8b3f 2786 if (ieee80211_is_data(fc)) {
56af3268 2787 prev_sta = NULL;
4406c376 2788
abe60632 2789 for_each_sta_info(local, hdr->addr2, sta, tmp) {
56af3268
BG		 2790 if (!prev_sta) {
2791 prev_sta = sta;
2792 continue;
2793 }
2794
2795 rx.sta = prev_sta;
2796 rx.sdata = prev_sta->sdata;
4406c376 2797 ieee80211_prepare_and_rx_handle(&rx, skb, false);
abe60632 2798
56af3268 2799 prev_sta = sta;
4406c376 2800 }
56af3268
BG		 2801
2802 if (prev_sta) {
2803 rx.sta = prev_sta;
2804 rx.sdata = prev_sta->sdata;
2805
4406c376 2806 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
56af3268 2807 return;
8e26d5ad 2808 goto out;
56af3268 2809 }
4406c376
JB		 2810 }
2811
4b0dd98e 2812 prev = NULL;
b2e7771e 2813
4b0dd98e
JB		 2814 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2815 if (!ieee80211_sdata_running(sdata))
2816 continue;
340e11f3 2817
4b0dd98e
JB		 2818 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2819 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2820 continue;
340e11f3 2821
4b0dd98e
JB		 2822 /*
2823 * frame is destined for this interface, but if it's
2824 * not also for the previous one we handle that after
2825 * the loop to avoid copying the SKB once too much
2826 */
4bb29f8c 2827
4b0dd98e 2828 if (!prev) {
abe60632 2829 prev = sdata;
4b0dd98e 2830 continue;
340e11f3 2831 }
4bb29f8c 2832
4b0dd98e
JB		 2833 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2834 rx.sdata = prev;
2835 ieee80211_prepare_and_rx_handle(&rx, skb, false);
4bb29f8c 2836
4b0dd98e
JB		 2837 prev = sdata;
2838 }
2839
2840 if (prev) {
2841 rx.sta = sta_info_get_bss(prev, hdr->addr2);
2842 rx.sdata = prev;
4406c376 2843
4b0dd98e
JB		 2844 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
2845 return;
571ecf67 2846 }
4406c376 2847
8e26d5ad 2848 out:
4406c376 2849 dev_kfree_skb(skb);
571ecf67 2850}
6368e4b1
RR		 2851
2852/*
2853 * This is the receive path handler. It is called by a low level driver when an
2854 * 802.11 MPDU is received from the hardware.
2855 */
103bf9f7 2856void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2857{
2858 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2859 struct ieee80211_rate *rate = NULL;
2860 struct ieee80211_supported_band *sband;
f1d58c25 2861 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a 2862
d20ef63d
JB		 2863 WARN_ON_ONCE(softirq_count() == 0);
2864
77a980dc
JB		 2865 if (WARN_ON(status->band < 0 ||
2866 status->band >= IEEE80211_NUM_BANDS))
2867 goto drop;
8318d78a
JB		 2868
2869 sband = local->hw.wiphy->bands[status->band];
77a980dc
JB		 2870 if (WARN_ON(!sband))
2871 goto drop;
8318d78a 2872
89c3a8ac
JB		 2873 /*
2874 * If we're suspending, it is possible although not too likely
2875 * that we'd be receiving frames after having already partially
2876 * quiesced the stack. We can't process such frames then since
2877 * that might, for example, cause stations to be added or other
2878 * driver callbacks be invoked.
2879 */
77a980dc
JB		 2880 if (unlikely(local->quiescing || local->suspended))
2881 goto drop;
89c3a8ac 2882
ea77f12f
JB		 2883 /*
2884 * The same happens when we're not even started,
2885 * but that's worth a warning.
2886 */
77a980dc
JB		 2887 if (WARN_ON(!local->started))
2888 goto drop;
ea77f12f 2889
fc885189 2890 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
e5d6eb83 2891 /*
fc885189
JB		 2892 * Validate the rate, unless a PLCP error means that
2893 * we probably can't have a valid rate here anyway.
e5d6eb83 2894 */
fc885189
JB		 2895
2896 if (status->flag & RX_FLAG_HT) {
2897 /*
2898 * rate_idx is MCS index, which can be [0-76]
2899 * as documented on:
2900 *
2901 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
2902 *
2903 * Anything else would be some sort of driver or
2904 * hardware error. The driver should catch hardware
2905 * errors.
2906 */
2907 if (WARN((status->rate_idx < 0 ||
2908 status->rate_idx > 76),
2909 "Rate marked as an HT rate but passed "
2910 "status->rate_idx is not "
2911 "an MCS index [0-76]: %d (0x%02x)\n",
2912 status->rate_idx,
2913 status->rate_idx))
2914 goto drop;
2915 } else {
2916 if (WARN_ON(status->rate_idx < 0 ||
2917 status->rate_idx >= sband->n_bitrates))
2918 goto drop;
2919 rate = &sband->bitrates[status->rate_idx];
2920 }
0fb8ca45 2921 }
6368e4b1 2922
554891e6
JB		 2923 status->rx_flags = 0;
2924
6368e4b1
RR		 2925 /*
2926 * key references and virtual interfaces are protected using RCU
2927 * and this requires that we are in a read-side RCU section during
2928 * receive processing
2929 */
2930 rcu_read_lock();
2931
2932 /*
2933 * Frames with failed FCS/PLCP checksum are not returned,
2934 * all other frames are returned without radiotap header
2935 * if it was previously present.
2936 * Also, frames with less than 16 bytes are dropped.
2937 */
f1d58c25 2938 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2939 if (!skb) {
2940 rcu_read_unlock();
2941 return;
2942 }
2943
e1e54068
JB		 2944 ieee80211_tpt_led_trig_rx(local,
2945 ((struct ieee80211_hdr *)skb->data)->frame_control,
2946 skb->len);
071d9ac2 2947 __ieee80211_rx_handle_packet(hw, skb);
6368e4b1
RR		 2948
2949 rcu_read_unlock();
77a980dc
JB		 2950
2951 return;
2952 drop:
2953 kfree_skb(skb);
6368e4b1 2954}
103bf9f7 2955EXPORT_SYMBOL(ieee80211_rx);
571ecf67
JB		 2956
2957/* This is a version of the rx handler that can be called from hard irq
2958 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2959void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2960{
2961 struct ieee80211_local *local = hw_to_local(hw);
2962
2963 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2964
571ecf67
JB		 2965 skb->pkt_type = IEEE80211_RX_MSG;
2966 skb_queue_tail(&local->skb_queue, skb);
2967 tasklet_schedule(&local->tasklet);
2968}
2969EXPORT_SYMBOL(ieee80211_rx_irqsafe);
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