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mac80211: fix multi-use timer
[deliverable/linux.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>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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>
571ecf67
JB		 13#include <linux/kernel.h>
14#include <linux/skbuff.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
d4e46a3d 17#include <linux/rcupdate.h>
571ecf67
JB		 18#include <net/mac80211.h>
19#include <net/ieee80211_radiotap.h>
20
21#include "ieee80211_i.h"
24487981 22#include "driver-ops.h"
2c8dccc7 23#include "led.h"
33b64eb2 24#include "mesh.h"
571ecf67
JB		 25#include "wep.h"
26#include "wpa.h"
27#include "tkip.h"
28#include "wme.h"
29
c6a1fa12
JB		 30static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
31 struct tid_ampdu_rx *tid_agg_rx,
32 struct sk_buff *skb,
33 u16 mpdu_seq_num,
34 int bar_req);
b2e7771e
JB		 35/*
36 * monitor mode reception
37 *
38 * This function cleans up the SKB, i.e. it removes all the stuff
39 * only useful for monitoring.
40 */
41static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
42 struct sk_buff *skb,
43 int rtap_len)
44{
45 skb_pull(skb, rtap_len);
46
47 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
48 if (likely(skb->len > FCS_LEN))
49 skb_trim(skb, skb->len - FCS_LEN);
50 else {
51 /* driver bug */
52 WARN_ON(1);
53 dev_kfree_skb(skb);
54 skb = NULL;
55 }
56 }
57
58 return skb;
59}
60
f1d58c25 61static inline int should_drop_frame(struct sk_buff *skb,
b2e7771e
JB		 62 int present_fcs_len,
63 int radiotap_len)
64{
f1d58c25 65 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
182503ab 66 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 67
68 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
69 return 1;
70 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
71 return 1;
87228f57
HH		 72 if (ieee80211_is_ctl(hdr->frame_control) &&
73 !ieee80211_is_pspoll(hdr->frame_control) &&
74 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 75 return 1;
76 return 0;
77}
78
601ae7f2
BR		 79static int
80ieee80211_rx_radiotap_len(struct ieee80211_local *local,
81 struct ieee80211_rx_status *status)
82{
83 int len;
84
85 /* always present fields */
86 len = sizeof(struct ieee80211_radiotap_header) + 9;
87
88 if (status->flag & RX_FLAG_TSFT)
89 len += 8;
7fee5372 90 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
601ae7f2
BR		 91 len += 1;
92 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
93 len += 1;
94
95 if (len & 1) /* padding for RX_FLAGS if necessary */
96 len++;
97
98 /* make sure radiotap starts at a naturally aligned address */
99 if (len % 8)
100 len = roundup(len, 8);
101
102 return len;
103}
104
d1c3a37c 105/*
601ae7f2
BR		 106 * ieee80211_add_rx_radiotap_header - add radiotap header
107 *
108 * add a radiotap header containing all the fields which the hardware provided.
109 */
110static void
111ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
112 struct sk_buff *skb,
601ae7f2
BR		 113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
f1d58c25 116 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
601ae7f2
BR		 117 struct ieee80211_radiotap_header *rthdr;
118 unsigned char *pos;
119
120 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
121 memset(rthdr, 0, rtap_len);
122
123 /* radiotap header, set always present flags */
124 rthdr->it_present =
125 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
601ae7f2
BR		 126 (1 << IEEE80211_RADIOTAP_CHANNEL) |
127 (1 << IEEE80211_RADIOTAP_ANTENNA) |
128 (1 << IEEE80211_RADIOTAP_RX_FLAGS));
129 rthdr->it_len = cpu_to_le16(rtap_len);
130
131 pos = (unsigned char *)(rthdr+1);
132
133 /* the order of the following fields is important */
134
135 /* IEEE80211_RADIOTAP_TSFT */
136 if (status->flag & RX_FLAG_TSFT) {
137 *(__le64 *)pos = cpu_to_le64(status->mactime);
138 rthdr->it_present |=
139 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
140 pos += 8;
141 }
142
143 /* IEEE80211_RADIOTAP_FLAGS */
144 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
145 *pos |= IEEE80211_RADIOTAP_F_FCS;
aae89831
JB		 146 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
147 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
b4f28bbb
BR		 148 if (status->flag & RX_FLAG_SHORTPRE)
149 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 150 pos++;
151
152 /* IEEE80211_RADIOTAP_RATE */
0fb8ca45
JM		 153 if (status->flag & RX_FLAG_HT) {
154 /*
155 * TODO: add following information into radiotap header once
156 * suitable fields are defined for it:
157 * - MCS index (status->rate_idx)
158 * - HT40 (status->flag & RX_FLAG_40MHZ)
159 * - short-GI (status->flag & RX_FLAG_SHORT_GI)
160 */
161 *pos = 0;
8d6f658e 162 } else {
ebe6c7ba 163 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
0fb8ca45 164 *pos = rate->bitrate / 5;
8d6f658e 165 }
601ae7f2
BR		 166 pos++;
167
168 /* IEEE80211_RADIOTAP_CHANNEL */
169 *(__le16 *)pos = cpu_to_le16(status->freq);
170 pos += 2;
171 if (status->band == IEEE80211_BAND_5GHZ)
172 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
173 IEEE80211_CHAN_5GHZ);
9deb1ae5
BR		 174 else if (rate->flags & IEEE80211_RATE_ERP_G)
175 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
176 IEEE80211_CHAN_2GHZ);
601ae7f2 177 else
9deb1ae5 178 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
601ae7f2
BR		 179 IEEE80211_CHAN_2GHZ);
180 pos += 2;
181
182 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
183 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
184 *pos = status->signal;
185 rthdr->it_present |=
186 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
187 pos++;
188 }
189
190 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
191 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
192 *pos = status->noise;
193 rthdr->it_present |=
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
195 pos++;
196 }
197
198 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
199
200 /* IEEE80211_RADIOTAP_ANTENNA */
201 *pos = status->antenna;
202 pos++;
203
601ae7f2
BR		 204 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
205
206 /* IEEE80211_RADIOTAP_RX_FLAGS */
207 /* ensure 2 byte alignment for the 2 byte field as required */
208 if ((pos - (unsigned char *)rthdr) & 1)
209 pos++;
aae89831
JB		 210 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
211 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP);
601ae7f2
BR		 212 pos += 2;
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;
230 int rtap_len = 0;
231
232 /*
233 * First, we may need to make a copy of the skb because
234 * (1) we need to modify it for radiotap (if not present), and
235 * (2) the other RX handlers will modify the skb we got.
236 *
237 * We don't need to, of course, if we aren't going to return
238 * the SKB because it has a bad FCS/PLCP checksum.
239 */
240 if (status->flag & RX_FLAG_RADIOTAP)
241 rtap_len = ieee80211_get_radiotap_len(origskb->data);
242 else
601ae7f2
BR		 243 /* room for the radiotap header based on driver features */
244 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 245
246 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
247 present_fcs_len = FCS_LEN;
248
249 if (!local->monitors) {
f1d58c25 250 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
b2e7771e
JB		 251 dev_kfree_skb(origskb);
252 return NULL;
253 }
254
255 return remove_monitor_info(local, origskb, rtap_len);
256 }
257
f1d58c25 258 if (should_drop_frame(origskb, present_fcs_len, rtap_len)) {
b2e7771e
JB		 259 /* only need to expand headroom if necessary */
260 skb = origskb;
261 origskb = NULL;
262
263 /*
264 * This shouldn't trigger often because most devices have an
265 * RX header they pull before we get here, and that should
266 * be big enough for our radiotap information. We should
267 * probably export the length to drivers so that we can have
268 * them allocate enough headroom to start with.
269 */
270 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 271 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 272 dev_kfree_skb(skb);
273 return NULL;
274 }
275 } else {
276 /*
277 * Need to make a copy and possibly remove radiotap header
278 * and FCS from the original.
279 */
280 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
281
282 origskb = remove_monitor_info(local, origskb, rtap_len);
283
284 if (!skb)
285 return origskb;
286 }
287
288 /* if necessary, prepend radiotap information */
601ae7f2 289 if (!(status->flag & RX_FLAG_RADIOTAP))
f1d58c25 290 ieee80211_add_rx_radiotap_header(local, skb, rate,
601ae7f2 291 needed_headroom);
b2e7771e 292
ce3edf6d 293 skb_reset_mac_header(skb);
b2e7771e
JB		 294 skb->ip_summed = CHECKSUM_UNNECESSARY;
295 skb->pkt_type = PACKET_OTHERHOST;
296 skb->protocol = htons(ETH_P_802_2);
297
298 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
299 if (!netif_running(sdata->dev))
300 continue;
301
05c914fe 302 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 303 continue;
304
3d30d949
MW		 305 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
306 continue;
307
b2e7771e
JB		 308 if (prev_dev) {
309 skb2 = skb_clone(skb, GFP_ATOMIC);
310 if (skb2) {
311 skb2->dev = prev_dev;
312 netif_rx(skb2);
313 }
314 }
315
316 prev_dev = sdata->dev;
317 sdata->dev->stats.rx_packets++;
318 sdata->dev->stats.rx_bytes += skb->len;
319 }
320
321 if (prev_dev) {
322 skb->dev = prev_dev;
323 netif_rx(skb);
324 } else
325 dev_kfree_skb(skb);
326
327 return origskb;
328}
329
330
5cf121c3 331static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 332{
238f74a2 333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 334 int tid;
335
336 /* does the frame have a qos control field? */
238f74a2
HH		 337 if (ieee80211_is_data_qos(hdr->frame_control)) {
338 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 339 /* frame has qos control */
238f74a2
HH		 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
341 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 342 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 343 else
5cf121c3 344 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
377 * in front of it).
378 *
379 * With A-MSDU frames, however, the payload data address must yield two modulo
380 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
381 * push the IP header further back to a multiple of four again. Thankfully, the
382 * specs were sane enough this time around to require padding each A-MSDU
383 * subframe to a length that is a multiple of four.
384 *
385 * Padding like Atheros hardware adds which is inbetween the 802.11 header and
386 * the payload is not supported, the driver is required to move the 802.11
387 * header to be directly in front of the payload in that case.
388 */
389static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
38f3714d 390{
a7767f95 391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
38f3714d
JB		 392 int hdrlen;
393
d1c3a37c
JB		 394#ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
395 return;
396#endif
397
398 if (WARN_ONCE((unsigned long)rx->skb->data & 1,
399 "unaligned packet at 0x%p\n", rx->skb->data))
400 return;
401
a7767f95 402 if (!ieee80211_is_data_present(hdr->frame_control))
38f3714d
JB		 403 return;
404
a7767f95 405 hdrlen = ieee80211_hdrlen(hdr->frame_control);
5cf121c3 406 if (rx->flags & IEEE80211_RX_AMSDU)
38f3714d 407 hdrlen += ETH_HLEN;
d1c3a37c
JB		 408 WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3,
409 "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen);
6e0d114d
JB		 410}
411
6368e4b1 412
571ecf67
JB		 413/* rx handlers */
414
49461622 415static ieee80211_rx_result debug_noinline
5cf121c3 416ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 417{
418 struct ieee80211_local *local = rx->local;
419 struct sk_buff *skb = rx->skb;
420
c2b13452 421 if (unlikely(local->hw_scanning))
f1d58c25 422 return ieee80211_scan_rx(rx->sdata, skb);
ece8eddd 423
c2b13452 424 if (unlikely(local->sw_scanning)) {
ece8eddd 425 /* drop all the other packets during a software scan anyway */
f1d58c25 426 if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED)
ece8eddd 427 dev_kfree_skb(skb);
9ae54c84 428 return RX_QUEUED;
571ecf67
JB		 429 }
430
5cf121c3 431 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
571ecf67
JB		 432 /* scanning finished during invoking of handlers */
433 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
e4c26add 434 return RX_DROP_UNUSABLE;
571ecf67
JB		 435 }
436
9ae54c84 437 return RX_CONTINUE;
571ecf67
JB		 438}
439
3cfcf6ac
JM		 440
441static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
442{
443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
444
445 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
446 return 0;
447
448 return ieee80211_is_robust_mgmt_frame(hdr);
449}
450
451
452static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
453{
454 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
455
456 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
457 return 0;
458
459 return ieee80211_is_robust_mgmt_frame(hdr);
460}
461
462
463/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
464static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
465{
466 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
467 struct ieee80211_mmie *mmie;
468
469 if (skb->len < 24 + sizeof(*mmie) ||
470 !is_multicast_ether_addr(hdr->da))
471 return -1;
472
473 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
474 return -1; /* not a robust management frame */
475
476 mmie = (struct ieee80211_mmie *)
477 (skb->data + skb->len - sizeof(*mmie));
478 if (mmie->element_id != WLAN_EID_MMIE ||
479 mmie->length != sizeof(*mmie) - 2)
480 return -1;
481
482 return le16_to_cpu(mmie->key_id);
483}
484
485
33b64eb2 486static ieee80211_rx_result
5cf121c3 487ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 488{
a7767f95
HH		 489 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
490 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
d6d1a5a7 491
a7767f95
HH		 492 if (ieee80211_is_data(hdr->frame_control)) {
493 if (!ieee80211_has_a4(hdr->frame_control))
33b64eb2
LCC		 494 return RX_DROP_MONITOR;
495 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
496 return RX_DROP_MONITOR;
497 }
498
499 /* If there is not an established peer link and this is not a peer link
500 * establisment frame, beacon or probe, drop the frame.
501 */
502
b4e08ea1 503 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 504 struct ieee80211_mgmt *mgmt;
d6d1a5a7 505
a7767f95 506 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 507 return RX_DROP_MONITOR;
508
a7767f95 509 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2
LCC		 510 mgmt = (struct ieee80211_mgmt *)hdr;
511 if (mgmt->u.action.category != PLINK_CATEGORY)
512 return RX_DROP_MONITOR;
33b64eb2 513 return RX_CONTINUE;
33b64eb2
LCC		 514 }
515
a7767f95
HH		 516 if (ieee80211_is_probe_req(hdr->frame_control) ||
517 ieee80211_is_probe_resp(hdr->frame_control) ||
518 ieee80211_is_beacon(hdr->frame_control))
519 return RX_CONTINUE;
520
521 return RX_DROP_MONITOR;
522
523 }
524
525#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
526
527 if (ieee80211_is_data(hdr->frame_control) &&
528 is_multicast_ether_addr(hdr->addr1) &&
f698d856 529 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 530 return RX_DROP_MONITOR;
902acc78 531#undef msh_h_get
d6d1a5a7 532
902acc78
JB		 533 return RX_CONTINUE;
534}
33b64eb2
LCC		 535
536
49461622 537static ieee80211_rx_result debug_noinline
5cf121c3 538ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 539{
a7767f95 540 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 541
542 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
543 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 544 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 545 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 546 hdr->seq_ctrl)) {
5cf121c3 547 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 548 rx->local->dot11FrameDuplicateCount++;
549 rx->sta->num_duplicates++;
550 }
e4c26add 551 return RX_DROP_MONITOR;
571ecf67 552 } else
5cf121c3 553 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 554 }
555
571ecf67
JB		 556 if (unlikely(rx->skb->len < 16)) {
557 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 558 return RX_DROP_MONITOR;
571ecf67
JB		 559 }
560
571ecf67
JB		 561 /* Drop disallowed frame classes based on STA auth/assoc state;
562 * IEEE 802.11, Chap 5.5.
563 *
ccd7b362
JB		 564 * mac80211 filters only based on association state, i.e. it drops
565 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 566 * deauth/disassoc frames when needed. In addition, hostapd is
567 * responsible for filtering on both auth and assoc states.
568 */
33b64eb2 569
902acc78 570 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 571 return ieee80211_rx_mesh_check(rx);
33b64eb2 572
a7767f95
HH		 573 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 575 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 576 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 577 if ((!ieee80211_has_fromds(hdr->frame_control) &&
578 !ieee80211_has_tods(hdr->frame_control) &&
579 ieee80211_is_data(hdr->frame_control)) ||
580 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 581 /* Drop IBSS frames and frames for other hosts
582 * silently. */
e4c26add 583 return RX_DROP_MONITOR;
571ecf67
JB		 584 }
585
e4c26add 586 return RX_DROP_MONITOR;
571ecf67
JB		 587 }
588
9ae54c84 589 return RX_CONTINUE;
570bd537
JB		 590}
591
592
49461622 593static ieee80211_rx_result debug_noinline
5cf121c3 594ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 595{
a7767f95 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3017b80b
JB		 597 int keyidx;
598 int hdrlen;
e4c26add 599 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 600 struct ieee80211_key *stakey = NULL;
3cfcf6ac 601 int mmie_keyidx = -1;
570bd537 602
3017b80b
JB		 603 /*
604 * Key selection 101
605 *
3cfcf6ac 606 * There are four types of keys:
3017b80b 607 * - GTK (group keys)
3cfcf6ac 608 * - IGTK (group keys for management frames)
3017b80b
JB		 609 * - PTK (pairwise keys)
610 * - STK (station-to-station pairwise keys)
611 *
612 * When selecting a key, we have to distinguish between multicast
613 * (including broadcast) and unicast frames, the latter can only
3cfcf6ac
JM		 614 * use PTKs and STKs while the former always use GTKs and IGTKs.
615 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
616 * unicast frames can also use key indices like GTKs. Hence, if we
617 * don't have a PTK/STK we check the key index for a WEP key.
3017b80b 618 *
8dc06a1c
JB		 619 * Note that in a regular BSS, multicast frames are sent by the
620 * AP only, associated stations unicast the frame to the AP first
621 * which then multicasts it on their behalf.
622 *
3017b80b
JB		 623 * There is also a slight problem in IBSS mode: GTKs are negotiated
624 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 625 * The spec seems to expect that one negotiates the same key with
626 * every station but there's no such requirement; VLANs could be
627 * possible.
3017b80b
JB		 628 */
629
3017b80b 630 /*
1990af8d 631 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 632 * addressed to us nor a multicast frame.
633 */
5cf121c3 634 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 635 return RX_CONTINUE;
3017b80b 636
d4e46a3d
JB		 637 if (rx->sta)
638 stakey = rcu_dereference(rx->sta->key);
639
0c7c10c7
JM		 640 if (!ieee80211_has_protected(hdr->frame_control))
641 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
642
d4e46a3d
JB		 643 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
644 rx->key = stakey;
0c7c10c7
JM		 645 /* Skip decryption if the frame is not protected. */
646 if (!ieee80211_has_protected(hdr->frame_control))
647 return RX_CONTINUE;
3cfcf6ac
JM		 648 } else if (mmie_keyidx >= 0) {
649 /* Broadcast/multicast robust management frame / BIP */
650 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
651 (rx->status->flag & RX_FLAG_IV_STRIPPED))
652 return RX_CONTINUE;
653
654 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
655 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
656 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
657 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
0c7c10c7
JM		 658 } else if (!ieee80211_has_protected(hdr->frame_control)) {
659 /*
660 * The frame was not protected, so skip decryption. However, we
661 * need to set rx->key if there is a key that could have been
662 * used so that the frame may be dropped if encryption would
663 * have been expected.
664 */
665 struct ieee80211_key *key = NULL;
666 if (ieee80211_is_mgmt(hdr->frame_control) &&
667 is_multicast_ether_addr(hdr->addr1) &&
668 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
669 rx->key = key;
670 else if ((key = rcu_dereference(rx->sdata->default_key)))
671 rx->key = key;
672 return RX_CONTINUE;
571ecf67 673 } else {
3017b80b
JB		 674 /*
675 * The device doesn't give us the IV so we won't be
676 * able to look up the key. That's ok though, we
677 * don't need to decrypt the frame, we just won't
678 * be able to keep statistics accurate.
679 * Except for key threshold notifications, should
680 * we somehow allow the driver to tell us which key
681 * the hardware used if this flag is set?
682 */
5cf121c3
JB		 683 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
684 (rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 685 return RX_CONTINUE;
3017b80b 686
a7767f95 687 hdrlen = ieee80211_hdrlen(hdr->frame_control);
3017b80b
JB		 688
689 if (rx->skb->len < 8 + hdrlen)
e4c26add 690 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 691
692 /*
693 * no need to call ieee80211_wep_get_keyidx,
694 * it verifies a bunch of things we've done already
695 */
696 keyidx = rx->skb->data[hdrlen + 3] >> 6;
697
d4e46a3d 698 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 699
700 /*
701 * RSNA-protected unicast frames should always be sent with
702 * pairwise or station-to-station keys, but for WEP we allow
703 * using a key index as well.
704 */
8f20fc24 705 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 706 !is_multicast_ether_addr(hdr->addr1))
707 rx->key = NULL;
571ecf67
JB		 708 }
709
3017b80b 710 if (rx->key) {
571ecf67 711 rx->key->tx_rx_count++;
011bfcc4 712 /* TODO: add threshold stuff again */
1990af8d 713 } else {
e4c26add 714 return RX_DROP_MONITOR;
70f08765
JB		 715 }
716
1990af8d
JB		 717 /* Check for weak IVs if possible */
718 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
a7767f95 719 ieee80211_is_data(hdr->frame_control) &&
5cf121c3
JB		 720 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
721 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
1990af8d
JB		 722 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
723 rx->sta->wep_weak_iv_count++;
724
70f08765
JB		 725 switch (rx->key->conf.alg) {
726 case ALG_WEP:
e2f036da
MN		 727 result = ieee80211_crypto_wep_decrypt(rx);
728 break;
70f08765 729 case ALG_TKIP:
e2f036da
MN		 730 result = ieee80211_crypto_tkip_decrypt(rx);
731 break;
70f08765 732 case ALG_CCMP:
e2f036da
MN		 733 result = ieee80211_crypto_ccmp_decrypt(rx);
734 break;
3cfcf6ac
JM		 735 case ALG_AES_CMAC:
736 result = ieee80211_crypto_aes_cmac_decrypt(rx);
737 break;
70f08765
JB		 738 }
739
e2f036da 740 /* either the frame has been decrypted or will be dropped */
5cf121c3 741 rx->status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 742
743 return result;
70f08765
JB		 744}
745
572e0012
KV		 746static ieee80211_rx_result debug_noinline
747ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
748{
749 struct ieee80211_local *local;
750 struct ieee80211_hdr *hdr;
751 struct sk_buff *skb;
752
753 local = rx->local;
754 skb = rx->skb;
755 hdr = (struct ieee80211_hdr *) skb->data;
756
757 if (!local->pspolling)
758 return RX_CONTINUE;
759
760 if (!ieee80211_has_fromds(hdr->frame_control))
761 /* this is not from AP */
762 return RX_CONTINUE;
763
764 if (!ieee80211_is_data(hdr->frame_control))
765 return RX_CONTINUE;
766
767 if (!ieee80211_has_moredata(hdr->frame_control)) {
768 /* AP has no more frames buffered for us */
769 local->pspolling = false;
770 return RX_CONTINUE;
771 }
772
773 /* more data bit is set, let's request a new frame from the AP */
774 ieee80211_send_pspoll(local, rx->sdata);
775
776 return RX_CONTINUE;
777}
778
133b8226 779static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 780{
133b8226 781 struct ieee80211_sub_if_data *sdata = sta->sdata;
4571d3bf 782 struct ieee80211_local *local = sdata->local;
0795af57 783
3e122be0 784 atomic_inc(&sdata->bss->num_sta_ps);
07346f81 785 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
24487981 786 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta);
571ecf67 787#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 788 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n",
789 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67
JB		 790#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
791}
792
133b8226 793static int ap_sta_ps_end(struct sta_info *sta)
571ecf67 794{
133b8226
JB		 795 struct ieee80211_sub_if_data *sdata = sta->sdata;
796 struct ieee80211_local *local = sdata->local;
8f77f384 797 int sent, buffered;
571ecf67 798
3e122be0 799 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 800
07346f81 801 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
24487981 802 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
004c872e
JB		 803
804 if (!skb_queue_empty(&sta->ps_tx_buf))
805 sta_info_clear_tim_bit(sta);
806
571ecf67 807#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 808 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",
809 sdata->dev->name, sta->sta.addr, sta->sta.aid);
571ecf67 810#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 811
571ecf67 812 /* Send all buffered frames to the station */
8f77f384
JB		 813 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
814 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
815 sent += buffered;
816 local->total_ps_buffered -= buffered;
817
571ecf67 818#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
8f77f384
JB		 819 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
820 "since STA not sleeping anymore\n", sdata->dev->name,
821 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
571ecf67 822#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 823
824 return sent;
825}
826
49461622 827static ieee80211_rx_result debug_noinline
5cf121c3 828ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 829{
830 struct sta_info *sta = rx->sta;
a7767f95 831 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 832
833 if (!sta)
9ae54c84 834 return RX_CONTINUE;
571ecf67
JB		 835
836 /* Update last_rx only for IBSS packets which are for the current
837 * BSSID to avoid keeping the current IBSS network alive in cases where
838 * other STAs are using different BSSID. */
05c914fe 839 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 840 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 841 NL80211_IFTYPE_ADHOC);
46900298 842 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0)
571ecf67
JB		 843 sta->last_rx = jiffies;
844 } else
845 if (!is_multicast_ether_addr(hdr->addr1) ||
05c914fe 846 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
571ecf67
JB		 847 /* Update last_rx only for unicast frames in order to prevent
848 * the Probe Request frames (the only broadcast frames from a
849 * STA in infrastructure mode) from keeping a connection alive.
33b64eb2
LCC		 850 * Mesh beacons will update last_rx when if they are found to
851 * match the current local configuration when processed.
571ecf67 852 */
15b7b062
KV		 853 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
854 ieee80211_is_beacon(hdr->frame_control)) {
855 rx->sdata->u.mgd.last_beacon = jiffies;
856 } else
857 sta->last_rx = jiffies;
571ecf67
JB		 858 }
859
5cf121c3 860 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 861 return RX_CONTINUE;
571ecf67 862
3cf335d5
KV		 863 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
864 ieee80211_sta_rx_notify(rx->sdata, hdr);
865
571ecf67
JB		 866 sta->rx_fragments++;
867 sta->rx_bytes += rx->skb->len;
5cf121c3 868 sta->last_signal = rx->status->signal;
566bfe5a 869 sta->last_qual = rx->status->qual;
5cf121c3 870 sta->last_noise = rx->status->noise;
571ecf67 871
72eaa43a
JB		 872 /*
873 * Change STA power saving mode only at the end of a frame
874 * exchange sequence.
875 */
3e122be0 876 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 877 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
878 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
72eaa43a
JB		 879 if (test_sta_flags(sta, WLAN_STA_PS)) {
880 /*
881 * Ignore doze->wake transitions that are
882 * indicated by non-data frames, the standard
883 * is unclear here, but for example going to
884 * PS mode and then scanning would cause a
885 * doze->wake transition for the probe request,
886 * and that is clearly undesirable.
887 */
888 if (ieee80211_is_data(hdr->frame_control) &&
889 !ieee80211_has_pm(hdr->frame_control))
890 rx->sent_ps_buffered += ap_sta_ps_end(sta);
891 } else {
892 if (ieee80211_has_pm(hdr->frame_control))
893 ap_sta_ps_start(sta);
894 }
571ecf67
JB		 895 }
896
897 /* Drop data::nullfunc frames silently, since they are used only to
898 * control station power saving mode. */
a7767f95 899 if (ieee80211_is_nullfunc(hdr->frame_control)) {
571ecf67
JB		 900 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
901 /* Update counter and free packet here to avoid counting this
902 * as a dropped packed. */
903 sta->rx_packets++;
904 dev_kfree_skb(rx->skb);
9ae54c84 905 return RX_QUEUED;
571ecf67
JB		 906 }
907
9ae54c84 908 return RX_CONTINUE;
571ecf67
JB		 909} /* ieee80211_rx_h_sta_process */
910
571ecf67
JB		 911static inline struct ieee80211_fragment_entry *
912ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
913 unsigned int frag, unsigned int seq, int rx_queue,
914 struct sk_buff **skb)
915{
916 struct ieee80211_fragment_entry *entry;
917 int idx;
918
919 idx = sdata->fragment_next;
920 entry = &sdata->fragments[sdata->fragment_next++];
921 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
922 sdata->fragment_next = 0;
923
924 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 925#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 926 struct ieee80211_hdr *hdr =
927 (struct ieee80211_hdr *) entry->skb_list.next->data;
928 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
929 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0c68ae26 930 "addr1=%pM addr2=%pM\n",
571ecf67
JB		 931 sdata->dev->name, idx,
932 jiffies - entry->first_frag_time, entry->seq,
0c68ae26 933 entry->last_frag, hdr->addr1, hdr->addr2);
f4ea83dd 934#endif
571ecf67
JB		 935 __skb_queue_purge(&entry->skb_list);
936 }
937
938 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
939 *skb = NULL;
940 entry->first_frag_time = jiffies;
941 entry->seq = seq;
942 entry->rx_queue = rx_queue;
943 entry->last_frag = frag;
944 entry->ccmp = 0;
945 entry->extra_len = 0;
946
947 return entry;
948}
949
950static inline struct ieee80211_fragment_entry *
951ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 952 unsigned int frag, unsigned int seq,
571ecf67
JB		 953 int rx_queue, struct ieee80211_hdr *hdr)
954{
955 struct ieee80211_fragment_entry *entry;
956 int i, idx;
957
958 idx = sdata->fragment_next;
959 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
960 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 961
962 idx--;
963 if (idx < 0)
964 idx = IEEE80211_FRAGMENT_MAX - 1;
965
966 entry = &sdata->fragments[idx];
967 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
968 entry->rx_queue != rx_queue ||
969 entry->last_frag + 1 != frag)
970 continue;
971
b73d70ad 972 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 973
b73d70ad
HH		 974 /*
975 * Check ftype and addresses are equal, else check next fragment
976 */
977 if (((hdr->frame_control ^ f_hdr->frame_control) &
978 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 979 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
980 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
981 continue;
982
ab46623e 983 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 984 __skb_queue_purge(&entry->skb_list);
985 continue;
986 }
987 return entry;
988 }
989
990 return NULL;
991}
992
49461622 993static ieee80211_rx_result debug_noinline
5cf121c3 994ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 995{
996 struct ieee80211_hdr *hdr;
997 u16 sc;
358c8d9d 998 __le16 fc;
571ecf67
JB		 999 unsigned int frag, seq;
1000 struct ieee80211_fragment_entry *entry;
1001 struct sk_buff *skb;
1002
b73d70ad 1003 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 1004 fc = hdr->frame_control;
571ecf67
JB		 1005 sc = le16_to_cpu(hdr->seq_ctrl);
1006 frag = sc & IEEE80211_SCTL_FRAG;
1007
358c8d9d 1008 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 1009 (rx->skb)->len < 24 ||
1010 is_multicast_ether_addr(hdr->addr1))) {
1011 /* not fragmented */
1012 goto out;
1013 }
1014 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1015
1016 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1017
1018 if (frag == 0) {
1019 /* This is the first fragment of a new frame. */
1020 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 1021 rx->queue, &(rx->skb));
8f20fc24 1022 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 1023 ieee80211_has_protected(fc)) {
571ecf67
JB		 1024 /* Store CCMP PN so that we can verify that the next
1025 * fragment has a sequential PN value. */
1026 entry->ccmp = 1;
1027 memcpy(entry->last_pn,
5cf121c3 1028 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 1029 CCMP_PN_LEN);
1030 }
9ae54c84 1031 return RX_QUEUED;
571ecf67
JB		 1032 }
1033
1034 /* This is a fragment for a frame that should already be pending in
1035 * fragment cache. Add this fragment to the end of the pending entry.
1036 */
b73d70ad 1037 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 1038 if (!entry) {
1039 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 1040 return RX_DROP_MONITOR;
571ecf67
JB		 1041 }
1042
1043 /* Verify that MPDUs within one MSDU have sequential PN values.
1044 * (IEEE 802.11i, 8.3.3.4.5) */
1045 if (entry->ccmp) {
1046 int i;
1047 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 1048 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 1049 return RX_DROP_UNUSABLE;
571ecf67
JB		 1050 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
1051 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
1052 pn[i]++;
1053 if (pn[i])
1054 break;
1055 }
5cf121c3 1056 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 1057 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 1058 return RX_DROP_UNUSABLE;
571ecf67
JB		 1059 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
1060 }
1061
358c8d9d 1062 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 1063 __skb_queue_tail(&entry->skb_list, rx->skb);
1064 entry->last_frag = frag;
1065 entry->extra_len += rx->skb->len;
358c8d9d 1066 if (ieee80211_has_morefrags(fc)) {
571ecf67 1067 rx->skb = NULL;
9ae54c84 1068 return RX_QUEUED;
571ecf67
JB		 1069 }
1070
1071 rx->skb = __skb_dequeue(&entry->skb_list);
1072 if (skb_tailroom(rx->skb) < entry->extra_len) {
1073 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
1074 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1075 GFP_ATOMIC))) {
1076 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1077 __skb_queue_purge(&entry->skb_list);
e4c26add 1078 return RX_DROP_UNUSABLE;
571ecf67
JB		 1079 }
1080 }
1081 while ((skb = __skb_dequeue(&entry->skb_list))) {
1082 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1083 dev_kfree_skb(skb);
1084 }
1085
1086 /* Complete frame has been reassembled - process it now */
5cf121c3 1087 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 1088
1089 out:
1090 if (rx->sta)
1091 rx->sta->rx_packets++;
1092 if (is_multicast_ether_addr(hdr->addr1))
1093 rx->local->dot11MulticastReceivedFrameCount++;
1094 else
1095 ieee80211_led_rx(rx->local);
9ae54c84 1096 return RX_CONTINUE;
571ecf67
JB		 1097}
1098
49461622 1099static ieee80211_rx_result debug_noinline
5cf121c3 1100ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 1101{
98f0b0a3 1102 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67
JB		 1103 struct sk_buff *skb;
1104 int no_pending_pkts;
358c8d9d 1105 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 1106
358c8d9d 1107 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 1108 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 1109 return RX_CONTINUE;
571ecf67 1110
05c914fe
JB		 1111 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
1112 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 1113 return RX_DROP_UNUSABLE;
98f0b0a3 1114
571ecf67
JB		 1115 skb = skb_dequeue(&rx->sta->tx_filtered);
1116 if (!skb) {
1117 skb = skb_dequeue(&rx->sta->ps_tx_buf);
1118 if (skb)
1119 rx->local->total_ps_buffered--;
1120 }
1121 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
1122 skb_queue_empty(&rx->sta->ps_tx_buf);
1123
1124 if (skb) {
1125 struct ieee80211_hdr *hdr =
1126 (struct ieee80211_hdr *) skb->data;
1127
4a9a66e9
JB		 1128 /*
1129 * Tell TX path to send one frame even though the STA may
1130 * still remain is PS mode after this frame exchange.
1131 */
07346f81 1132 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67
JB		 1133
1134#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB		 1135 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
1136 rx->sta->sta.addr, rx->sta->sta.aid,
571ecf67
JB		 1137 skb_queue_len(&rx->sta->ps_tx_buf));
1138#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1139
1140 /* Use MoreData flag to indicate whether there are more
1141 * buffered frames for this STA */
836341a7 1142 if (no_pending_pkts)
571ecf67 1143 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
836341a7 1144 else
571ecf67
JB		 1145 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1146
1147 dev_queue_xmit(skb);
1148
004c872e
JB		 1149 if (no_pending_pkts)
1150 sta_info_clear_tim_bit(rx->sta);
571ecf67 1151#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
5cf121c3 1152 } else if (!rx->sent_ps_buffered) {
004c872e
JB		 1153 /*
1154 * FIXME: This can be the result of a race condition between
1155 * us expiring a frame and the station polling for it.
1156 * Should we send it a null-func frame indicating we
1157 * have nothing buffered for it?
1158 */
0c68ae26 1159 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
f4ea83dd 1160 "though there are no buffered frames for it\n",
0c68ae26 1161 rx->dev->name, rx->sta->sta.addr);
571ecf67 1162#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 1163 }
1164
9ae54c84 1165 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1166 * count as an dropped frame. */
1167 dev_kfree_skb(rx->skb);
1168
9ae54c84 1169 return RX_QUEUED;
571ecf67
JB		 1170}
1171
49461622 1172static ieee80211_rx_result debug_noinline
5cf121c3 1173ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1174{
6e0d114d 1175 u8 *data = rx->skb->data;
238f74a2 1176 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1177
238f74a2 1178 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1179 return RX_CONTINUE;
6e0d114d
JB		 1180
1181 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1182 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1183 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1184 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1185 /* change frame type to non QOS */
238f74a2 1186 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1187
9ae54c84 1188 return RX_CONTINUE;
6e0d114d
JB		 1189}
1190
76ee65bf 1191static int
5cf121c3 1192ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1193{
07346f81 1194 if (unlikely(!rx->sta ||
f4ea83dd 1195 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1196 return -EACCES;
571ecf67 1197
76ee65bf 1198 return 0;
571ecf67
JB		 1199}
1200
76ee65bf 1201static int
358c8d9d 1202ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1203{
3017b80b 1204 /*
7848ba7d
JB		 1205 * Pass through unencrypted frames if the hardware has
1206 * decrypted them already.
3017b80b 1207 */
5cf121c3 1208 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1209 return 0;
571ecf67
JB		 1210
1211 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1212 if (unlikely(!ieee80211_has_protected(fc) &&
1213 !ieee80211_is_nullfunc(fc) &&
f2ca3ea4 1214 ieee80211_is_data(fc) &&
b3fc9c6c 1215 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1216 return -EACCES;
f2ca3ea4
JM		 1217 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) {
1218 if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
1219 rx->key))
1220 return -EACCES;
1221 /* BIP does not use Protected field, so need to check MMIE */
1222 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb)
1223 && ieee80211_get_mmie_keyidx(rx->skb) < 0 &&
1224 rx->key))
1225 return -EACCES;
1226 /*
1227 * When using MFP, Action frames are not allowed prior to
1228 * having configured keys.
1229 */
1230 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
1231 ieee80211_is_robust_mgmt_frame(
1232 (struct ieee80211_hdr *) rx->skb->data)))
1233 return -EACCES;
1234 }
b3fc9c6c 1235
76ee65bf 1236 return 0;
571ecf67
JB		 1237}
1238
76ee65bf 1239static int
e31a16d6 1240__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1241{
1242 struct net_device *dev = rx->dev;
571ecf67
JB		 1243 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1244
e31a16d6 1245 return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type);
76ee65bf 1246}
571ecf67 1247
ce3edf6d
JB		 1248/*
1249 * requires that rx->skb is a frame with ethernet header
1250 */
358c8d9d 1251static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1252{
c97c23e3 1253 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1254 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1255 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1256
1257 /*
1258 * Allow EAPOL frames to us/the PAE group address regardless
1259 * of whether the frame was encrypted or not.
1260 */
1261 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1262 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1263 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1264 return true;
1265
1266 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1267 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1268 return false;
1269
1270 return true;
1271}
1272
1273/*
1274 * requires that rx->skb is a frame with ethernet header
1275 */
76ee65bf 1276static void
5cf121c3 1277ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1278{
1279 struct net_device *dev = rx->dev;
1280 struct ieee80211_local *local = rx->local;
1281 struct sk_buff *skb, *xmit_skb;
1282 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ce3edf6d
JB		 1283 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1284 struct sta_info *dsta;
571ecf67 1285
76ee65bf
RR		 1286 skb = rx->skb;
1287 xmit_skb = NULL;
571ecf67 1288
05c914fe
JB		 1289 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1290 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1291 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
5cf121c3 1292 (rx->flags & IEEE80211_RX_RA_MATCH)) {
ce3edf6d
JB		 1293 if (is_multicast_ether_addr(ehdr->h_dest)) {
1294 /*
1295 * send multicast frames both to higher layers in
1296 * local net stack and back to the wireless medium
1297 */
76ee65bf
RR		 1298 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1299 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1300 printk(KERN_DEBUG "%s: failed to clone "
1301 "multicast frame\n", dev->name);
1302 } else {
571ecf67 1303 dsta = sta_info_get(local, skb->data);
d0709a65 1304 if (dsta && dsta->sdata->dev == dev) {
ce3edf6d
JB		 1305 /*
1306 * The destination station is associated to
1307 * this AP (in this VLAN), so send the frame
1308 * directly to it and do not pass it to local
1309 * net stack.
571ecf67 1310 */
76ee65bf 1311 xmit_skb = skb;
571ecf67
JB		 1312 skb = NULL;
1313 }
571ecf67
JB		 1314 }
1315 }
1316
1317 if (skb) {
d1c3a37c
JB		 1318 int align __maybe_unused;
1319
1320#if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
1321 /*
1322 * 'align' will only take the values 0 or 2 here
1323 * since all frames are required to be aligned
1324 * to 2-byte boundaries when being passed to
1325 * mac80211. That also explains the __skb_push()
1326 * below.
1327 */
dacb6f1d 1328 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
d1c3a37c
JB		 1329 if (align) {
1330 if (WARN_ON(skb_headroom(skb) < 3)) {
1331 dev_kfree_skb(skb);
1332 skb = NULL;
1333 } else {
1334 u8 *data = skb->data;
1335 size_t len = skb->len;
1336 u8 *new = __skb_push(skb, align);
1337 memmove(new, data, len);
1338 __skb_trim(skb, len);
1339 }
1340 }
1341#endif
1342
1343 if (skb) {
1344 /* deliver to local stack */
1345 skb->protocol = eth_type_trans(skb, dev);
1346 memset(skb->cb, 0, sizeof(skb->cb));
1347 netif_rx(skb);
1348 }
571ecf67
JB		 1349 }
1350
76ee65bf 1351 if (xmit_skb) {
571ecf67 1352 /* send to wireless media */
f831e909 1353 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1354 skb_reset_network_header(xmit_skb);
1355 skb_reset_mac_header(xmit_skb);
76ee65bf 1356 dev_queue_xmit(xmit_skb);
571ecf67 1357 }
76ee65bf
RR		 1358}
1359
49461622 1360static ieee80211_rx_result debug_noinline
5cf121c3 1361ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f
RR		 1362{
1363 struct net_device *dev = rx->dev;
1364 struct ieee80211_local *local = rx->local;
358c8d9d 1365 u16 ethertype;
fd4c7f2f
RR		 1366 u8 *payload;
1367 struct sk_buff *skb = rx->skb, *frame = NULL;
358c8d9d
HH		 1368 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1369 __le16 fc = hdr->frame_control;
fd4c7f2f
RR		 1370 const struct ethhdr *eth;
1371 int remaining, err;
1372 u8 dst[ETH_ALEN];
1373 u8 src[ETH_ALEN];
fd4c7f2f 1374
358c8d9d 1375 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1376 return RX_CONTINUE;
fd4c7f2f 1377
358c8d9d 1378 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1379 return RX_DROP_MONITOR;
fd4c7f2f 1380
5cf121c3 1381 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1382 return RX_CONTINUE;
fd4c7f2f 1383
e31a16d6 1384 err = __ieee80211_data_to_8023(rx);
fd4c7f2f 1385 if (unlikely(err))
e4c26add 1386 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1387
1388 skb->dev = dev;
1389
1390 dev->stats.rx_packets++;
1391 dev->stats.rx_bytes += skb->len;
1392
1393 /* skip the wrapping header */
1394 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1395 if (!eth)
e4c26add 1396 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1397
1398 while (skb != frame) {
1399 u8 padding;
1400 __be16 len = eth->h_proto;
1401 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1402
1403 remaining = skb->len;
1404 memcpy(dst, eth->h_dest, ETH_ALEN);
1405 memcpy(src, eth->h_source, ETH_ALEN);
1406
1407 padding = ((4 - subframe_len) & 0x3);
1408 /* the last MSDU has no padding */
f4ea83dd 1409 if (subframe_len > remaining)
e4c26add 1410 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1411
1412 skb_pull(skb, sizeof(struct ethhdr));
1413 /* if last subframe reuse skb */
1414 if (remaining <= subframe_len + padding)
1415 frame = skb;
1416 else {
d1c3a37c
JB		 1417 /*
1418 * Allocate and reserve two bytes more for payload
1419 * alignment since sizeof(struct ethhdr) is 14.
1420 */
1421 frame = dev_alloc_skb(
1422 ALIGN(local->hw.extra_tx_headroom, 4) +
1423 subframe_len + 2);
fd4c7f2f
RR		 1424
1425 if (frame == NULL)
e4c26add 1426 return RX_DROP_UNUSABLE;
fd4c7f2f 1427
d1c3a37c
JB		 1428 skb_reserve(frame,
1429 ALIGN(local->hw.extra_tx_headroom, 4) +
1430 sizeof(struct ethhdr) + 2);
fd4c7f2f
RR		 1431 memcpy(skb_put(frame, ntohs(len)), skb->data,
1432 ntohs(len));
1433
1434 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1435 padding);
1436 if (!eth) {
fd4c7f2f 1437 dev_kfree_skb(frame);
e4c26add 1438 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1439 }
1440 }
1441
ce3edf6d 1442 skb_reset_network_header(frame);
fd4c7f2f
RR		 1443 frame->dev = dev;
1444 frame->priority = skb->priority;
1445 rx->skb = frame;
1446
fd4c7f2f
RR		 1447 payload = frame->data;
1448 ethertype = (payload[6] << 8) | payload[7];
1449
1450 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
ce3edf6d
JB		 1451 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1452 compare_ether_addr(payload,
1453 bridge_tunnel_header) == 0)) {
fd4c7f2f
RR		 1454 /* remove RFC1042 or Bridge-Tunnel
1455 * encapsulation and replace EtherType */
1456 skb_pull(frame, 6);
1457 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1458 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1459 } else {
ce3edf6d
JB		 1460 memcpy(skb_push(frame, sizeof(__be16)),
1461 &len, sizeof(__be16));
fd4c7f2f
RR		 1462 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1463 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1464 }
1465
358c8d9d 1466 if (!ieee80211_frame_allowed(rx, fc)) {
ce3edf6d 1467 if (skb == frame) /* last frame */
e4c26add 1468 return RX_DROP_UNUSABLE;
ce3edf6d
JB		 1469 dev_kfree_skb(frame);
1470 continue;
1471 }
fd4c7f2f
RR		 1472
1473 ieee80211_deliver_skb(rx);
1474 }
1475
9ae54c84 1476 return RX_QUEUED;
fd4c7f2f
RR		 1477}
1478
bf94e17b 1479#ifdef CONFIG_MAC80211_MESH
b0dee578 1480static ieee80211_rx_result
e32f85f7
LCC		 1481ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1482{
1483 struct ieee80211_hdr *hdr;
1484 struct ieee80211s_hdr *mesh_hdr;
1485 unsigned int hdrlen;
1486 struct sk_buff *skb = rx->skb, *fwd_skb;
1487
1488 hdr = (struct ieee80211_hdr *) skb->data;
1489 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1490 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1491
1492 if (!ieee80211_is_data(hdr->frame_control))
1493 return RX_CONTINUE;
1494
1495 if (!mesh_hdr->ttl)
1496 /* illegal frame */
1497 return RX_DROP_MONITOR;
1498
79617dee
Y		 1499 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1500 struct ieee80211_sub_if_data *sdata;
1501 struct mesh_path *mppath;
1502
1503 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1504 rcu_read_lock();
1505 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1506 if (!mppath) {
1507 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1508 } else {
1509 spin_lock_bh(&mppath->state_lock);
1510 mppath->exp_time = jiffies;
1511 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1512 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1513 spin_unlock_bh(&mppath->state_lock);
1514 }
1515 rcu_read_unlock();
1516 }
1517
e32f85f7
LCC		 1518 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1519 return RX_CONTINUE;
1520
1521 mesh_hdr->ttl--;
1522
1523 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1524 if (!mesh_hdr->ttl)
472dbc45 1525 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1526 dropped_frames_ttl);
1527 else {
1528 struct ieee80211_hdr *fwd_hdr;
1529 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1530
1531 if (!fwd_skb && net_ratelimit())
1532 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1533 rx->dev->name);
1534
1535 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1536 /*
1537 * Save TA to addr1 to send TA a path error if a
1538 * suitable next hop is not found
1539 */
1540 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1541 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1542 fwd_skb->dev = rx->local->mdev;
1543 fwd_skb->iif = rx->dev->ifindex;
1544 dev_queue_xmit(fwd_skb);
1545 }
1546 }
1547
1548 if (is_multicast_ether_addr(hdr->addr3) ||
1549 rx->dev->flags & IFF_PROMISC)
1550 return RX_CONTINUE;
1551 else
1552 return RX_DROP_MONITOR;
1553}
bf94e17b 1554#endif
e32f85f7 1555
49461622 1556static ieee80211_rx_result debug_noinline
5cf121c3 1557ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1558{
1559 struct net_device *dev = rx->dev;
358c8d9d
HH		 1560 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1561 __le16 fc = hdr->frame_control;
ce3edf6d 1562 int err;
76ee65bf 1563
358c8d9d 1564 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1565 return RX_CONTINUE;
76ee65bf 1566
358c8d9d 1567 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1568 return RX_DROP_MONITOR;
76ee65bf 1569
e31a16d6 1570 err = __ieee80211_data_to_8023(rx);
76ee65bf 1571 if (unlikely(err))
e4c26add 1572 return RX_DROP_UNUSABLE;
76ee65bf 1573
358c8d9d 1574 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1575 return RX_DROP_MONITOR;
ce3edf6d 1576
76ee65bf
RR		 1577 rx->skb->dev = dev;
1578
1579 dev->stats.rx_packets++;
1580 dev->stats.rx_bytes += rx->skb->len;
1581
1582 ieee80211_deliver_skb(rx);
571ecf67 1583
9ae54c84 1584 return RX_QUEUED;
571ecf67
JB		 1585}
1586
49461622 1587static ieee80211_rx_result debug_noinline
5cf121c3 1588ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1589{
1590 struct ieee80211_local *local = rx->local;
1591 struct ieee80211_hw *hw = &local->hw;
1592 struct sk_buff *skb = rx->skb;
a7767f95 1593 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1594 struct tid_ampdu_rx *tid_agg_rx;
1595 u16 start_seq_num;
1596 u16 tid;
1597
a7767f95 1598 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1599 return RX_CONTINUE;
71364716 1600
a7767f95 1601 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1602 if (!rx->sta)
9ae54c84 1603 return RX_CONTINUE;
71364716 1604 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1605 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1606 != HT_AGG_STATE_OPERATIONAL)
9ae54c84 1607 return RX_CONTINUE;
cee24a3e 1608 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1609
1610 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1611
1612 /* reset session timer */
20ad19d0
JB		 1613 if (tid_agg_rx->timeout)
1614 mod_timer(&tid_agg_rx->session_timer,
1615 TU_TO_EXP_TIME(tid_agg_rx->timeout));
71364716
RR		 1616
1617 /* manage reordering buffer according to requested */
1618 /* sequence number */
1619 rcu_read_lock();
f1d58c25 1620 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
71364716
RR		 1621 start_seq_num, 1);
1622 rcu_read_unlock();
e4c26add 1623 return RX_DROP_UNUSABLE;
71364716
RR		 1624 }
1625
9ae54c84 1626 return RX_CONTINUE;
71364716
RR		 1627}
1628
f4f727a6
JM		 1629static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
1630 struct ieee80211_mgmt *mgmt,
1631 size_t len)
fea14732
JM		 1632{
1633 struct ieee80211_local *local = sdata->local;
1634 struct sk_buff *skb;
1635 struct ieee80211_mgmt *resp;
1636
1637 if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
1638 /* Not to own unicast address */
1639 return;
1640 }
1641
46900298
JB		 1642 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 ||
1643 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) {
77fdaa12 1644 /* Not from the current AP or not associated yet. */
fea14732
JM		 1645 return;
1646 }
1647
1648 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
1649 /* Too short SA Query request frame */
1650 return;
1651 }
1652
1653 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
1654 if (skb == NULL)
1655 return;
1656
1657 skb_reserve(skb, local->hw.extra_tx_headroom);
1658 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
1659 memset(resp, 0, 24);
1660 memcpy(resp->da, mgmt->sa, ETH_ALEN);
1661 memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
46900298 1662 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
fea14732
JM		 1663 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1664 IEEE80211_STYPE_ACTION);
1665 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
1666 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
1667 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
1668 memcpy(resp->u.action.u.sa_query.trans_id,
1669 mgmt->u.action.u.sa_query.trans_id,
1670 WLAN_SA_QUERY_TR_ID_LEN);
1671
1672 ieee80211_tx_skb(sdata, skb, 1);
1673}
1674
de1ede7a
JB		 1675static ieee80211_rx_result debug_noinline
1676ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1677{
1678 struct ieee80211_local *local = rx->local;
1679 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1680 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1681 int len = rx->skb->len;
1682
1683 if (!ieee80211_is_action(mgmt->frame_control))
1684 return RX_CONTINUE;
1685
1686 if (!rx->sta)
1687 return RX_DROP_MONITOR;
1688
1689 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1690 return RX_DROP_MONITOR;
1691
97ebe12a
JM		 1692 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1693 return RX_DROP_MONITOR;
1694
de1ede7a
JB		 1695 /* all categories we currently handle have action_code */
1696 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1697 return RX_DROP_MONITOR;
1698
de1ede7a
JB		 1699 switch (mgmt->u.action.category) {
1700 case WLAN_CATEGORY_BACK:
8abd3f9b
JB		 1701 /*
1702 * The aggregation code is not prepared to handle
1703 * anything but STA/AP due to the BSSID handling;
1704 * IBSS could work in the code but isn't supported
1705 * by drivers or the standard.
1706 */
1707 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1708 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1709 sdata->vif.type != NL80211_IFTYPE_AP)
1710 return RX_DROP_MONITOR;
1711
de1ede7a
JB		 1712 switch (mgmt->u.action.u.addba_req.action_code) {
1713 case WLAN_ACTION_ADDBA_REQ:
1714 if (len < (IEEE80211_MIN_ACTION_SIZE +
1715 sizeof(mgmt->u.action.u.addba_req)))
1716 return RX_DROP_MONITOR;
1717 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1718 break;
1719 case WLAN_ACTION_ADDBA_RESP:
1720 if (len < (IEEE80211_MIN_ACTION_SIZE +
1721 sizeof(mgmt->u.action.u.addba_resp)))
1722 return RX_DROP_MONITOR;
1723 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1724 break;
1725 case WLAN_ACTION_DELBA:
1726 if (len < (IEEE80211_MIN_ACTION_SIZE +
1727 sizeof(mgmt->u.action.u.delba)))
1728 return RX_DROP_MONITOR;
1729 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1730 break;
1731 }
39192c0b
JB		 1732 break;
1733 case WLAN_CATEGORY_SPECTRUM_MGMT:
1734 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1735 return RX_DROP_MONITOR;
46900298
JB		 1736
1737 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1738 return RX_DROP_MONITOR;
1739
39192c0b
JB		 1740 switch (mgmt->u.action.u.measurement.action_code) {
1741 case WLAN_ACTION_SPCT_MSR_REQ:
1742 if (len < (IEEE80211_MIN_ACTION_SIZE +
1743 sizeof(mgmt->u.action.u.measurement)))
1744 return RX_DROP_MONITOR;
1745 ieee80211_process_measurement_req(sdata, mgmt, len);
1746 break;
c481ec97
S		 1747 case WLAN_ACTION_SPCT_CHL_SWITCH:
1748 if (len < (IEEE80211_MIN_ACTION_SIZE +
1749 sizeof(mgmt->u.action.u.chan_switch)))
1750 return RX_DROP_MONITOR;
1751
cc32abd4
JB		 1752 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1753 return RX_DROP_MONITOR;
1754
46900298 1755 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN))
c481ec97
S		 1756 return RX_DROP_MONITOR;
1757
77fdaa12 1758 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
39192c0b
JB		 1759 }
1760 break;
fea14732
JM		 1761 case WLAN_CATEGORY_SA_QUERY:
1762 if (len < (IEEE80211_MIN_ACTION_SIZE +
1763 sizeof(mgmt->u.action.u.sa_query)))
1764 return RX_DROP_MONITOR;
1765 switch (mgmt->u.action.u.sa_query.action) {
1766 case WLAN_ACTION_SA_QUERY_REQUEST:
1767 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1768 return RX_DROP_MONITOR;
1769 ieee80211_process_sa_query_req(sdata, mgmt, len);
1770 break;
1771 case WLAN_ACTION_SA_QUERY_RESPONSE:
1772 /*
1773 * SA Query response is currently only used in AP mode
1774 * and it is processed in user space.
1775 */
1776 return RX_CONTINUE;
1777 }
1778 break;
39192c0b
JB		 1779 default:
1780 return RX_CONTINUE;
de1ede7a
JB		 1781 }
1782
39192c0b
JB		 1783 rx->sta->rx_packets++;
1784 dev_kfree_skb(rx->skb);
1785 return RX_QUEUED;
de1ede7a
JB		 1786}
1787
49461622 1788static ieee80211_rx_result debug_noinline
5cf121c3 1789ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1790{
759ef3eb 1791 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
97ebe12a 1792 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
571ecf67 1793
5cf121c3 1794 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1795 return RX_DROP_MONITOR;
571ecf67 1796
97ebe12a
JM		 1797 if (ieee80211_drop_unencrypted(rx, mgmt->frame_control))
1798 return RX_DROP_MONITOR;
1799
472dbc45 1800 if (ieee80211_vif_is_mesh(&sdata->vif))
f1d58c25 1801 return ieee80211_mesh_rx_mgmt(sdata, rx->skb);
472dbc45 1802
3832c287 1803 if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
f1d58c25 1804 return ieee80211_ibss_rx_mgmt(sdata, rx->skb);
f9d540ee 1805
7986cf95 1806 if (sdata->vif.type == NL80211_IFTYPE_STATION)
f1d58c25 1807 return ieee80211_sta_rx_mgmt(sdata, rx->skb);
46900298 1808
7986cf95 1809 return RX_DROP_MONITOR;
571ecf67
JB		 1810}
1811
571ecf67
JB		 1812static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1813 struct ieee80211_hdr *hdr,
5cf121c3 1814 struct ieee80211_rx_data *rx)
571ecf67 1815{
a7767f95
HH		 1816 int keyidx;
1817 unsigned int hdrlen;
571ecf67 1818
a7767f95 1819 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1820 if (rx->skb->len >= hdrlen + 4)
1821 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1822 else
1823 keyidx = -1;
1824
8944b79f 1825 if (!rx->sta) {
aa0daf0e
JB		 1826 /*
1827 * Some hardware seem to generate incorrect Michael MIC
1828 * reports; ignore them to avoid triggering countermeasures.
1829 */
571ecf67
JB		 1830 goto ignore;
1831 }
1832
a7767f95 1833 if (!ieee80211_has_protected(hdr->frame_control))
571ecf67 1834 goto ignore;
571ecf67 1835
05c914fe 1836 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 1837 /*
1838 * APs with pairwise keys should never receive Michael MIC
1839 * errors for non-zero keyidx because these are reserved for
1840 * group keys and only the AP is sending real multicast
1841 * frames in the BSS.
1842 */
eb063c17 1843 goto ignore;
571ecf67
JB		 1844 }
1845
a7767f95
HH		 1846 if (!ieee80211_is_data(hdr->frame_control) &&
1847 !ieee80211_is_auth(hdr->frame_control))
571ecf67 1848 goto ignore;
571ecf67 1849
e6d6e342
JB		 1850 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL,
1851 GFP_ATOMIC);
571ecf67
JB		 1852 ignore:
1853 dev_kfree_skb(rx->skb);
1854 rx->skb = NULL;
1855}
1856
5cf121c3
JB		 1857/* TODO: use IEEE80211_RX_FRAGMENTED */
1858static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1859{
1860 struct ieee80211_sub_if_data *sdata;
1861 struct ieee80211_local *local = rx->local;
1862 struct ieee80211_rtap_hdr {
1863 struct ieee80211_radiotap_header hdr;
1864 u8 flags;
1865 u8 rate;
1866 __le16 chan_freq;
1867 __le16 chan_flags;
1868 } __attribute__ ((packed)) *rthdr;
1869 struct sk_buff *skb = rx->skb, *skb2;
1870 struct net_device *prev_dev = NULL;
5cf121c3 1871 struct ieee80211_rx_status *status = rx->status;
3d30d949 1872
5cf121c3 1873 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1874 goto out_free_skb;
1875
1876 if (skb_headroom(skb) < sizeof(*rthdr) &&
1877 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1878 goto out_free_skb;
1879
1880 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1881 memset(rthdr, 0, sizeof(*rthdr));
1882 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1883 rthdr->hdr.it_present =
1884 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1885 (1 << IEEE80211_RADIOTAP_RATE) |
1886 (1 << IEEE80211_RADIOTAP_CHANNEL));
1887
5cf121c3 1888 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1889 rthdr->chan_freq = cpu_to_le16(status->freq);
1890
1891 if (status->band == IEEE80211_BAND_5GHZ)
1892 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1893 IEEE80211_CHAN_5GHZ);
1894 else
1895 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1896 IEEE80211_CHAN_2GHZ);
1897
1898 skb_set_mac_header(skb, 0);
1899 skb->ip_summed = CHECKSUM_UNNECESSARY;
1900 skb->pkt_type = PACKET_OTHERHOST;
1901 skb->protocol = htons(ETH_P_802_2);
1902
1903 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1904 if (!netif_running(sdata->dev))
1905 continue;
1906
05c914fe 1907 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 1908 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1909 continue;
1910
1911 if (prev_dev) {
1912 skb2 = skb_clone(skb, GFP_ATOMIC);
1913 if (skb2) {
1914 skb2->dev = prev_dev;
1915 netif_rx(skb2);
1916 }
1917 }
1918
1919 prev_dev = sdata->dev;
1920 sdata->dev->stats.rx_packets++;
1921 sdata->dev->stats.rx_bytes += skb->len;
1922 }
1923
1924 if (prev_dev) {
1925 skb->dev = prev_dev;
1926 netif_rx(skb);
1927 skb = NULL;
1928 } else
1929 goto out_free_skb;
1930
5cf121c3 1931 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 1932 return;
1933
1934 out_free_skb:
1935 dev_kfree_skb(skb);
1936}
1937
571ecf67 1938
8944b79f 1939static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1940 struct ieee80211_rx_data *rx,
8944b79f 1941 struct sk_buff *skb)
58905290 1942{
58905290
JB		 1943 ieee80211_rx_result res = RX_DROP_MONITOR;
1944
8944b79f
JB		 1945 rx->skb = skb;
1946 rx->sdata = sdata;
1947 rx->dev = sdata->dev;
1948
e32f85f7
LCC		 1949#define CALL_RXH(rxh) \
1950 do { \
1951 res = rxh(rx); \
1952 if (res != RX_CONTINUE) \
1953 goto rxh_done; \
1954 } while (0);
49461622
JB		 1955
1956 CALL_RXH(ieee80211_rx_h_passive_scan)
1957 CALL_RXH(ieee80211_rx_h_check)
1958 CALL_RXH(ieee80211_rx_h_decrypt)
572e0012 1959 CALL_RXH(ieee80211_rx_h_check_more_data)
49461622
JB		 1960 CALL_RXH(ieee80211_rx_h_sta_process)
1961 CALL_RXH(ieee80211_rx_h_defragment)
1962 CALL_RXH(ieee80211_rx_h_ps_poll)
1963 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1964 /* must be after MMIC verify so header is counted in MPDU mic */
1965 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1966 CALL_RXH(ieee80211_rx_h_amsdu)
bf94e17b 1967#ifdef CONFIG_MAC80211_MESH
e32f85f7
LCC		 1968 if (ieee80211_vif_is_mesh(&sdata->vif))
1969 CALL_RXH(ieee80211_rx_h_mesh_fwding);
bf94e17b 1970#endif
49461622
JB		 1971 CALL_RXH(ieee80211_rx_h_data)
1972 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 1973 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 1974 CALL_RXH(ieee80211_rx_h_mgmt)
1975
1976#undef CALL_RXH
1977
1978 rxh_done:
58905290
JB		 1979 switch (res) {
1980 case RX_DROP_MONITOR:
49461622
JB		 1981 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1982 if (rx->sta)
1983 rx->sta->rx_dropped++;
1984 /* fall through */
1985 case RX_CONTINUE:
3d30d949
MW		 1986 ieee80211_rx_cooked_monitor(rx);
1987 break;
58905290 1988 case RX_DROP_UNUSABLE:
49461622
JB		 1989 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1990 if (rx->sta)
1991 rx->sta->rx_dropped++;
58905290
JB		 1992 dev_kfree_skb(rx->skb);
1993 break;
49461622
JB		 1994 case RX_QUEUED:
1995 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1996 break;
58905290
JB		 1997 }
1998}
1999
571ecf67
JB		 2000/* main receive path */
2001
23a24def 2002static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
7ab17c45 2003 struct ieee80211_rx_data *rx,
23a24def
JB		 2004 struct ieee80211_hdr *hdr)
2005{
7ab17c45 2006 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type);
23a24def
JB		 2007 int multicast = is_multicast_ether_addr(hdr->addr1);
2008
51fb61e7 2009 switch (sdata->vif.type) {
05c914fe 2010 case NL80211_IFTYPE_STATION:
23a24def
JB		 2011 if (!bssid)
2012 return 0;
77fdaa12
JB		 2013 if (!multicast &&
2014 compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) {
4150c572 2015 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2016 return 0;
5cf121c3 2017 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2018 }
2019 break;
05c914fe 2020 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 2021 if (!bssid)
2022 return 0;
a7767f95 2023 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 2024 return 1;
87291c02 2025 }
46900298 2026 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) {
5cf121c3 2027 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2028 return 0;
5cf121c3 2029 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 2030 } else if (!multicast &&
2031 compare_ether_addr(sdata->dev->dev_addr,
2032 hdr->addr1) != 0) {
4150c572 2033 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 2034 return 0;
5cf121c3 2035 rx->flags &= ~IEEE80211_RX_RA_MATCH;
0fb8ca45
JM		 2036 } else if (!rx->sta) {
2037 int rate_idx;
2038 if (rx->status->flag & RX_FLAG_HT)
2039 rate_idx = 0; /* TODO: HT rates */
2040 else
2041 rate_idx = rx->status->rate_idx;
ab1f5c0b 2042 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2,
0fb8ca45
JM		 2043 BIT(rate_idx));
2044 }
23a24def 2045 break;
05c914fe 2046 case NL80211_IFTYPE_MESH_POINT:
6032f934
JB		 2047 if (!multicast &&
2048 compare_ether_addr(sdata->dev->dev_addr,
2049 hdr->addr1) != 0) {
2050 if (!(sdata->dev->flags & IFF_PROMISC))
2051 return 0;
2052
5cf121c3 2053 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 2054 }
2055 break;
05c914fe
JB		 2056 case NL80211_IFTYPE_AP_VLAN:
2057 case NL80211_IFTYPE_AP:
23a24def
JB		 2058 if (!bssid) {
2059 if (compare_ether_addr(sdata->dev->dev_addr,
2060 hdr->addr1))
2061 return 0;
2062 } else if (!ieee80211_bssid_match(bssid,
2063 sdata->dev->dev_addr)) {
5cf121c3 2064 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 2065 return 0;
5cf121c3 2066 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 2067 }
23a24def 2068 break;
05c914fe 2069 case NL80211_IFTYPE_WDS:
a7767f95 2070 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 2071 return 0;
2072 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
2073 return 0;
2074 break;
05c914fe 2075 case NL80211_IFTYPE_MONITOR:
fb1c1cd6
JB		 2076 /* take everything */
2077 break;
05c914fe
JB		 2078 case NL80211_IFTYPE_UNSPECIFIED:
2079 case __NL80211_IFTYPE_AFTER_LAST:
fb1c1cd6
JB		 2080 /* should never get here */
2081 WARN_ON(1);
2082 break;
23a24def
JB		 2083 }
2084
2085 return 1;
2086}
2087
571ecf67 2088/*
6368e4b1
RR		 2089 * This is the actual Rx frames handler. as it blongs to Rx path it must
2090 * be called with rcu_read_lock protection.
571ecf67 2091 */
71ebb4aa
RR		 2092static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
2093 struct sk_buff *skb,
8318d78a 2094 struct ieee80211_rate *rate)
571ecf67 2095{
f1d58c25 2096 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
571ecf67
JB		 2097 struct ieee80211_local *local = hw_to_local(hw);
2098 struct ieee80211_sub_if_data *sdata;
571ecf67 2099 struct ieee80211_hdr *hdr;
5cf121c3 2100 struct ieee80211_rx_data rx;
6368e4b1 2101 int prepares;
8e6f0032
JB		 2102 struct ieee80211_sub_if_data *prev = NULL;
2103 struct sk_buff *skb_new;
571ecf67 2104
358c8d9d 2105 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 2106 memset(&rx, 0, sizeof(rx));
2107 rx.skb = skb;
2108 rx.local = local;
2109
5cf121c3 2110 rx.status = status;
5cf121c3 2111 rx.rate = rate;
72abd81b 2112
358c8d9d 2113 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 2114 local->dot11ReceivedFragmentCount++;
571ecf67 2115
8944b79f
JB		 2116 rx.sta = sta_info_get(local, hdr->addr2);
2117 if (rx.sta) {
d0709a65
JB		 2118 rx.sdata = rx.sta->sdata;
2119 rx.dev = rx.sta->sdata->dev;
b2e7771e 2120 }
571ecf67 2121
571ecf67 2122 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
8944b79f 2123 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
d0709a65 2124 return;
571ecf67
JB		 2125 }
2126
c2b13452 2127 if (unlikely(local->sw_scanning || local->hw_scanning))
5cf121c3 2128 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 2129
38f3714d 2130 ieee80211_parse_qos(&rx);
d1c3a37c 2131 ieee80211_verify_alignment(&rx);
38f3714d 2132
571ecf67
JB		 2133 skb = rx.skb;
2134
79010420 2135 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 2136 if (!netif_running(sdata->dev))
2137 continue;
2138
05c914fe 2139 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 2140 continue;
2141
5cf121c3 2142 rx.flags |= IEEE80211_RX_RA_MATCH;
7ab17c45 2143 prepares = prepare_for_handlers(sdata, &rx, hdr);
23a24def 2144
6368e4b1 2145 if (!prepares)
23a24def 2146 continue;
8e6f0032 2147
340e11f3
JB		 2148 /*
2149 * frame is destined for this interface, but if it's not
2150 * also for the previous one we handle that after the
2151 * loop to avoid copying the SKB once too much
2152 */
2153
2154 if (!prev) {
2155 prev = sdata;
2156 continue;
8e6f0032 2157 }
340e11f3
JB		 2158
2159 /*
2160 * frame was destined for the previous interface
2161 * so invoke RX handlers for it
2162 */
2163
2164 skb_new = skb_copy(skb, GFP_ATOMIC);
2165 if (!skb_new) {
2166 if (net_ratelimit())
2167 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 2168 "multicast frame for %s\n",
dd1cd4c6
JB		 2169 wiphy_name(local->hw.wiphy),
2170 prev->dev->name);
340e11f3
JB		 2171 continue;
2172 }
8944b79f 2173 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 2174 prev = sdata;
571ecf67 2175 }
a4b7d7bd 2176 if (prev)
8944b79f 2177 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 2178 else
8e6f0032 2179 dev_kfree_skb(skb);
571ecf67 2180}
6368e4b1 2181
b580781e
RR		 2182#define SEQ_MODULO 0x1000
2183#define SEQ_MASK 0xfff
2184
2185static inline int seq_less(u16 sq1, u16 sq2)
2186{
c6a1fa12 2187 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
b580781e
RR		 2188}
2189
2190static inline u16 seq_inc(u16 sq)
2191{
c6a1fa12 2192 return (sq + 1) & SEQ_MASK;
b580781e
RR		 2193}
2194
2195static inline u16 seq_sub(u16 sq1, u16 sq2)
2196{
c6a1fa12 2197 return (sq1 - sq2) & SEQ_MASK;
b580781e
RR		 2198}
2199
2200
2d3babd1
JM		 2201static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw,
2202 struct tid_ampdu_rx *tid_agg_rx,
2203 int index)
2204{
2205 struct ieee80211_supported_band *sband;
2206 struct ieee80211_rate *rate;
f1d58c25
JB		 2207 struct sk_buff *skb = tid_agg_rx->reorder_buf[index];
2208 struct ieee80211_rx_status *status;
2d3babd1 2209
f1d58c25 2210 if (!skb)
2d3babd1
JM		 2211 goto no_frame;
2212
f1d58c25
JB		 2213 status = IEEE80211_SKB_RXCB(skb);
2214
2d3babd1 2215 /* release the reordered frames to stack */
f1d58c25
JB		 2216 sband = hw->wiphy->bands[status->band];
2217 if (status->flag & RX_FLAG_HT)
2d3babd1
JM		 2218 rate = sband->bitrates; /* TODO: HT rates */
2219 else
f1d58c25
JB		 2220 rate = &sband->bitrates[status->rate_idx];
2221 __ieee80211_rx_handle_packet(hw, skb, rate);
2d3babd1
JM		 2222 tid_agg_rx->stored_mpdu_num--;
2223 tid_agg_rx->reorder_buf[index] = NULL;
2224
2225no_frame:
2226 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2227}
2228
2229
4d050f1d
JM		 2230/*
2231 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
2232 * the skb was added to the buffer longer than this time ago, the earlier
2233 * frames that have not yet been received are assumed to be lost and the skb
2234 * can be released for processing. This may also release other skb's from the
2235 * reorder buffer if there are no additional gaps between the frames.
2236 */
2237#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
2238
71364716
RR		 2239/*
2240 * As it function blongs to Rx path it must be called with
2241 * the proper rcu_read_lock protection for its flow.
2242 */
c6a1fa12
JB		 2243static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2244 struct tid_ampdu_rx *tid_agg_rx,
2245 struct sk_buff *skb,
2246 u16 mpdu_seq_num,
2247 int bar_req)
b580781e 2248{
b580781e
RR		 2249 u16 head_seq_num, buf_size;
2250 int index;
b580781e
RR		 2251
2252 buf_size = tid_agg_rx->buf_size;
2253 head_seq_num = tid_agg_rx->head_seq_num;
2254
2255 /* frame with out of date sequence number */
2256 if (seq_less(mpdu_seq_num, head_seq_num)) {
2257 dev_kfree_skb(skb);
2258 return 1;
2259 }
2260
2261 /* if frame sequence number exceeds our buffering window size or
2262 * block Ack Request arrived - release stored frames */
2263 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2264 /* new head to the ordering buffer */
2265 if (bar_req)
2266 head_seq_num = mpdu_seq_num;
2267 else
2268 head_seq_num =
2269 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2270 /* release stored frames up to new head to stack */
2271 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2272 index = seq_sub(tid_agg_rx->head_seq_num,
2273 tid_agg_rx->ssn)
2274 % tid_agg_rx->buf_size;
2d3babd1
JM		 2275 ieee80211_release_reorder_frame(hw, tid_agg_rx,
2276 index);
b580781e
RR		 2277 }
2278 if (bar_req)
2279 return 1;
2280 }
2281
2282 /* now the new frame is always in the range of the reordering */
2283 /* buffer window */
2284 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2285 % tid_agg_rx->buf_size;
2286 /* check if we already stored this frame */
2287 if (tid_agg_rx->reorder_buf[index]) {
2288 dev_kfree_skb(skb);
2289 return 1;
2290 }
2291
2292 /* if arrived mpdu is in the right order and nothing else stored */
2293 /* release it immediately */
2294 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2295 tid_agg_rx->stored_mpdu_num == 0) {
2296 tid_agg_rx->head_seq_num =
2297 seq_inc(tid_agg_rx->head_seq_num);
2298 return 0;
2299 }
2300
2301 /* put the frame in the reordering buffer */
2302 tid_agg_rx->reorder_buf[index] = skb;
4d050f1d 2303 tid_agg_rx->reorder_time[index] = jiffies;
b580781e
RR		 2304 tid_agg_rx->stored_mpdu_num++;
2305 /* release the buffer until next missing frame */
2306 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2307 % tid_agg_rx->buf_size;
4d050f1d
JM		 2308 if (!tid_agg_rx->reorder_buf[index] &&
2309 tid_agg_rx->stored_mpdu_num > 1) {
2310 /*
2311 * No buffers ready to be released, but check whether any
2312 * frames in the reorder buffer have timed out.
2313 */
2314 int j;
2315 int skipped = 1;
2316 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
2317 j = (j + 1) % tid_agg_rx->buf_size) {
2318 if (tid_agg_rx->reorder_buf[j] == NULL) {
2319 skipped++;
2320 continue;
2321 }
2322 if (!time_after(jiffies, tid_agg_rx->reorder_time[j] +
2323 HZ / 10))
2324 break;
2325
2326#ifdef CONFIG_MAC80211_HT_DEBUG
2327 if (net_ratelimit())
2328 printk(KERN_DEBUG "%s: release an RX reorder "
2329 "frame due to timeout on earlier "
2330 "frames\n",
2331 wiphy_name(hw->wiphy));
2332#endif
2333 ieee80211_release_reorder_frame(hw, tid_agg_rx, j);
2334
2335 /*
2336 * Increment the head seq# also for the skipped slots.
2337 */
2338 tid_agg_rx->head_seq_num =
2339 (tid_agg_rx->head_seq_num + skipped) &
2340 SEQ_MASK;
2341 skipped = 0;
2342 }
2343 } else while (tid_agg_rx->reorder_buf[index]) {
2d3babd1 2344 ieee80211_release_reorder_frame(hw, tid_agg_rx, index);
b580781e
RR		 2345 index = seq_sub(tid_agg_rx->head_seq_num,
2346 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2347 }
2348 return 1;
2349}
2350
71ebb4aa 2351static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
f1d58c25 2352 struct sk_buff *skb)
b580781e
RR		 2353{
2354 struct ieee80211_hw *hw = &local->hw;
2355 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2356 struct sta_info *sta;
2357 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2358 u16 sc;
b580781e 2359 u16 mpdu_seq_num;
182503ab 2360 u8 ret = 0;
b580781e
RR		 2361 int tid;
2362
2363 sta = sta_info_get(local, hdr->addr2);
2364 if (!sta)
2365 return ret;
2366
b580781e
RR		 2367 /* filter the QoS data rx stream according to
2368 * STA/TID and check if this STA/TID is on aggregation */
87228f57 2369 if (!ieee80211_is_data_qos(hdr->frame_control))
b580781e
RR		 2370 goto end_reorder;
2371
238f74a2 2372 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2373
cee24a3e 2374 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
b580781e
RR		 2375 goto end_reorder;
2376
cee24a3e
RR		 2377 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2378
2560b6e2
EG		 2379 /* qos null data frames are excluded */
2380 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
b580781e
RR		 2381 goto end_reorder;
2382
2383 /* new un-ordered ampdu frame - process it */
2384
2385 /* reset session timer */
20ad19d0
JB		 2386 if (tid_agg_rx->timeout)
2387 mod_timer(&tid_agg_rx->session_timer,
2388 TU_TO_EXP_TIME(tid_agg_rx->timeout));
b580781e
RR		 2389
2390 /* if this mpdu is fragmented - terminate rx aggregation session */
2391 sc = le16_to_cpu(hdr->seq_ctrl);
2392 if (sc & IEEE80211_SCTL_FRAG) {
17741cdc 2393 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
b580781e
RR		 2394 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2395 ret = 1;
2396 goto end_reorder;
2397 }
2398
2399 /* according to mpdu sequence number deal with reordering buffer */
2400 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
f1d58c25 2401 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
b580781e 2402 mpdu_seq_num, 0);
d0709a65 2403 end_reorder:
b580781e
RR		 2404 return ret;
2405}
2406
6368e4b1
RR		 2407/*
2408 * This is the receive path handler. It is called by a low level driver when an
2409 * 802.11 MPDU is received from the hardware.
2410 */
f1d58c25 2411void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb)
6368e4b1
RR		 2412{
2413 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2414 struct ieee80211_rate *rate = NULL;
2415 struct ieee80211_supported_band *sband;
f1d58c25 2416 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
8318d78a
JB		 2417
2418 if (status->band < 0 ||
13d8fd2d 2419 status->band >= IEEE80211_NUM_BANDS) {
8318d78a
JB		 2420 WARN_ON(1);
2421 return;
2422 }
2423
2424 sband = local->hw.wiphy->bands[status->band];
0fb8ca45 2425 if (!sband) {
8318d78a
JB		 2426 WARN_ON(1);
2427 return;
2428 }
2429
0fb8ca45
JM		 2430 if (status->flag & RX_FLAG_HT) {
2431 /* rate_idx is MCS index */
2432 if (WARN_ON(status->rate_idx < 0 ||
2433 status->rate_idx >= 76))
2434 return;
2435 /* HT rates are not in the table - use the highest legacy rate
2436 * for now since other parts of mac80211 may not yet be fully
2437 * MCS aware. */
2438 rate = &sband->bitrates[sband->n_bitrates - 1];
2439 } else {
2440 if (WARN_ON(status->rate_idx < 0 ||
2441 status->rate_idx >= sband->n_bitrates))
2442 return;
2443 rate = &sband->bitrates[status->rate_idx];
2444 }
6368e4b1
RR		 2445
2446 /*
2447 * key references and virtual interfaces are protected using RCU
2448 * and this requires that we are in a read-side RCU section during
2449 * receive processing
2450 */
2451 rcu_read_lock();
2452
2453 /*
2454 * Frames with failed FCS/PLCP checksum are not returned,
2455 * all other frames are returned without radiotap header
2456 * if it was previously present.
2457 * Also, frames with less than 16 bytes are dropped.
2458 */
f1d58c25 2459 skb = ieee80211_rx_monitor(local, skb, rate);
6368e4b1
RR		 2460 if (!skb) {
2461 rcu_read_unlock();
2462 return;
2463 }
2464
aec67952
JM		 2465 /*
2466 * In theory, the block ack reordering should happen after duplicate
2467 * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
2468 * the call to ieee80211_rx_reorder_ampdu() should really be moved to
2469 * happen as a new RX handler between ieee80211_rx_h_check and
2470 * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
2471 * the time being, the call can be here since RX reorder buf processing
2472 * will implicitly skip duplicates. We could, in theory at least,
2473 * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
2474 * frames from other than operational channel), but that should not
2475 * happen in normal networks.
2476 */
f1d58c25
JB		 2477 if (!ieee80211_rx_reorder_ampdu(local, skb))
2478 __ieee80211_rx_handle_packet(hw, skb, rate);
6368e4b1
RR		 2479
2480 rcu_read_unlock();
2481}
571ecf67
JB		 2482EXPORT_SYMBOL(__ieee80211_rx);
2483
2484/* This is a version of the rx handler that can be called from hard irq
2485 * context. Post the skb on the queue and schedule the tasklet */
f1d58c25 2486void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
571ecf67
JB		 2487{
2488 struct ieee80211_local *local = hw_to_local(hw);
2489
2490 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2491
2492 skb->dev = local->mdev;
571ecf67
JB		 2493 skb->pkt_type = IEEE80211_RX_MSG;
2494 skb_queue_tail(&local->skb_queue, skb);
2495 tasklet_schedule(&local->tasklet);
2496}
2497EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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