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acpi: Make ACPI_TOSHIBA depend on INPUT.
[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"
2c8dccc7 22#include "led.h"
33b64eb2 23#include "mesh.h"
571ecf67
JB		 24#include "wep.h"
25#include "wpa.h"
26#include "tkip.h"
27#include "wme.h"
28
71364716
RR		 29u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
30 struct tid_ampdu_rx *tid_agg_rx,
31 struct sk_buff *skb, u16 mpdu_seq_num,
32 int bar_req);
b2e7771e
JB		 33/*
34 * monitor mode reception
35 *
36 * This function cleans up the SKB, i.e. it removes all the stuff
37 * only useful for monitoring.
38 */
39static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
40 struct sk_buff *skb,
41 int rtap_len)
42{
43 skb_pull(skb, rtap_len);
44
45 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) {
46 if (likely(skb->len > FCS_LEN))
47 skb_trim(skb, skb->len - FCS_LEN);
48 else {
49 /* driver bug */
50 WARN_ON(1);
51 dev_kfree_skb(skb);
52 skb = NULL;
53 }
54 }
55
56 return skb;
57}
58
59static inline int should_drop_frame(struct ieee80211_rx_status *status,
60 struct sk_buff *skb,
61 int present_fcs_len,
62 int radiotap_len)
63{
182503ab 64 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
b2e7771e
JB		 65
66 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
67 return 1;
68 if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len))
69 return 1;
87228f57
HH		 70 if (ieee80211_is_ctl(hdr->frame_control) &&
71 !ieee80211_is_pspoll(hdr->frame_control) &&
72 !ieee80211_is_back_req(hdr->frame_control))
b2e7771e
JB		 73 return 1;
74 return 0;
75}
76
601ae7f2
BR		 77static int
78ieee80211_rx_radiotap_len(struct ieee80211_local *local,
79 struct ieee80211_rx_status *status)
80{
81 int len;
82
83 /* always present fields */
84 len = sizeof(struct ieee80211_radiotap_header) + 9;
85
86 if (status->flag & RX_FLAG_TSFT)
87 len += 8;
88 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB ||
89 local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
90 len += 1;
91 if (local->hw.flags & IEEE80211_HW_NOISE_DBM)
92 len += 1;
93
94 if (len & 1) /* padding for RX_FLAGS if necessary */
95 len++;
96
97 /* make sure radiotap starts at a naturally aligned address */
98 if (len % 8)
99 len = roundup(len, 8);
100
101 return len;
102}
103
104/**
105 * ieee80211_add_rx_radiotap_header - add radiotap header
106 *
107 * add a radiotap header containing all the fields which the hardware provided.
108 */
109static void
110ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
111 struct sk_buff *skb,
112 struct ieee80211_rx_status *status,
113 struct ieee80211_rate *rate,
114 int rtap_len)
115{
116 struct ieee80211_radiotap_header *rthdr;
117 unsigned char *pos;
118
119 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
120 memset(rthdr, 0, rtap_len);
121
122 /* radiotap header, set always present flags */
123 rthdr->it_present =
124 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
125 (1 << IEEE80211_RADIOTAP_RATE) |
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;
b4f28bbb
BR		 146 if (status->flag & RX_FLAG_SHORTPRE)
147 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
601ae7f2
BR		 148 pos++;
149
150 /* IEEE80211_RADIOTAP_RATE */
151 *pos = rate->bitrate / 5;
152 pos++;
153
154 /* IEEE80211_RADIOTAP_CHANNEL */
155 *(__le16 *)pos = cpu_to_le16(status->freq);
156 pos += 2;
157 if (status->band == IEEE80211_BAND_5GHZ)
158 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
159 IEEE80211_CHAN_5GHZ);
9deb1ae5
BR		 160 else if (rate->flags & IEEE80211_RATE_ERP_G)
161 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM |
162 IEEE80211_CHAN_2GHZ);
601ae7f2 163 else
9deb1ae5 164 *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK |
601ae7f2
BR		 165 IEEE80211_CHAN_2GHZ);
166 pos += 2;
167
168 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
169 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
170 *pos = status->signal;
171 rthdr->it_present |=
172 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
173 pos++;
174 }
175
176 /* IEEE80211_RADIOTAP_DBM_ANTNOISE */
177 if (local->hw.flags & IEEE80211_HW_NOISE_DBM) {
178 *pos = status->noise;
179 rthdr->it_present |=
180 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
181 pos++;
182 }
183
184 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
185
186 /* IEEE80211_RADIOTAP_ANTENNA */
187 *pos = status->antenna;
188 pos++;
189
190 /* IEEE80211_RADIOTAP_DB_ANTSIGNAL */
191 if (local->hw.flags & IEEE80211_HW_SIGNAL_DB) {
192 *pos = status->signal;
193 rthdr->it_present |=
194 cpu_to_le32(1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL);
195 pos++;
196 }
197
198 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
199
200 /* IEEE80211_RADIOTAP_RX_FLAGS */
201 /* ensure 2 byte alignment for the 2 byte field as required */
202 if ((pos - (unsigned char *)rthdr) & 1)
203 pos++;
204 /* FIXME: when radiotap gets a 'bad PLCP' flag use it here */
205 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
206 *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADFCS);
207 pos += 2;
208}
209
b2e7771e
JB		 210/*
211 * This function copies a received frame to all monitor interfaces and
212 * returns a cleaned-up SKB that no longer includes the FCS nor the
213 * radiotap header the driver might have added.
214 */
215static struct sk_buff *
216ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
8318d78a
JB		 217 struct ieee80211_rx_status *status,
218 struct ieee80211_rate *rate)
b2e7771e
JB		 219{
220 struct ieee80211_sub_if_data *sdata;
b2e7771e 221 int needed_headroom = 0;
b2e7771e
JB		 222 struct sk_buff *skb, *skb2;
223 struct net_device *prev_dev = NULL;
224 int present_fcs_len = 0;
225 int rtap_len = 0;
226
227 /*
228 * First, we may need to make a copy of the skb because
229 * (1) we need to modify it for radiotap (if not present), and
230 * (2) the other RX handlers will modify the skb we got.
231 *
232 * We don't need to, of course, if we aren't going to return
233 * the SKB because it has a bad FCS/PLCP checksum.
234 */
235 if (status->flag & RX_FLAG_RADIOTAP)
236 rtap_len = ieee80211_get_radiotap_len(origskb->data);
237 else
601ae7f2
BR		 238 /* room for the radiotap header based on driver features */
239 needed_headroom = ieee80211_rx_radiotap_len(local, status);
b2e7771e
JB		 240
241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
242 present_fcs_len = FCS_LEN;
243
244 if (!local->monitors) {
245 if (should_drop_frame(status, origskb, present_fcs_len,
246 rtap_len)) {
247 dev_kfree_skb(origskb);
248 return NULL;
249 }
250
251 return remove_monitor_info(local, origskb, rtap_len);
252 }
253
254 if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) {
255 /* only need to expand headroom if necessary */
256 skb = origskb;
257 origskb = NULL;
258
259 /*
260 * This shouldn't trigger often because most devices have an
261 * RX header they pull before we get here, and that should
262 * be big enough for our radiotap information. We should
263 * probably export the length to drivers so that we can have
264 * them allocate enough headroom to start with.
265 */
266 if (skb_headroom(skb) < needed_headroom &&
c49e5ea3 267 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
b2e7771e
JB		 268 dev_kfree_skb(skb);
269 return NULL;
270 }
271 } else {
272 /*
273 * Need to make a copy and possibly remove radiotap header
274 * and FCS from the original.
275 */
276 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
277
278 origskb = remove_monitor_info(local, origskb, rtap_len);
279
280 if (!skb)
281 return origskb;
282 }
283
284 /* if necessary, prepend radiotap information */
601ae7f2
BR		 285 if (!(status->flag & RX_FLAG_RADIOTAP))
286 ieee80211_add_rx_radiotap_header(local, skb, status, rate,
287 needed_headroom);
b2e7771e 288
ce3edf6d 289 skb_reset_mac_header(skb);
b2e7771e
JB		 290 skb->ip_summed = CHECKSUM_UNNECESSARY;
291 skb->pkt_type = PACKET_OTHERHOST;
292 skb->protocol = htons(ETH_P_802_2);
293
294 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
295 if (!netif_running(sdata->dev))
296 continue;
297
05c914fe 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 299 continue;
300
3d30d949
MW		 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
302 continue;
303
b2e7771e
JB		 304 if (prev_dev) {
305 skb2 = skb_clone(skb, GFP_ATOMIC);
306 if (skb2) {
307 skb2->dev = prev_dev;
308 netif_rx(skb2);
309 }
310 }
311
312 prev_dev = sdata->dev;
313 sdata->dev->stats.rx_packets++;
314 sdata->dev->stats.rx_bytes += skb->len;
315 }
316
317 if (prev_dev) {
318 skb->dev = prev_dev;
319 netif_rx(skb);
320 } else
321 dev_kfree_skb(skb);
322
323 return origskb;
324}
325
326
5cf121c3 327static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
6e0d114d 328{
238f74a2 329 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
6e0d114d
JB		 330 int tid;
331
332 /* does the frame have a qos control field? */
238f74a2
HH		 333 if (ieee80211_is_data_qos(hdr->frame_control)) {
334 u8 *qc = ieee80211_get_qos_ctl(hdr);
6e0d114d 335 /* frame has qos control */
238f74a2
HH		 336 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
337 if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
5cf121c3 338 rx->flags |= IEEE80211_RX_AMSDU;
fd4c7f2f 339 else
5cf121c3 340 rx->flags &= ~IEEE80211_RX_AMSDU;
6e0d114d 341 } else {
1411f9b5
JB		 342 /*
343 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
344 *
345 * Sequence numbers for management frames, QoS data
346 * frames with a broadcast/multicast address in the
347 * Address 1 field, and all non-QoS data frames sent
348 * by QoS STAs are assigned using an additional single
349 * modulo-4096 counter, [...]
350 *
351 * We also use that counter for non-QoS STAs.
352 */
353 tid = NUM_RX_DATA_QUEUES - 1;
6e0d114d 354 }
52865dfd 355
5cf121c3 356 rx->queue = tid;
6e0d114d
JB		 357 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
358 * For now, set skb->priority to 0 for other cases. */
359 rx->skb->priority = (tid > 7) ? 0 : tid;
38f3714d 360}
6e0d114d 361
5cf121c3 362static void ieee80211_verify_ip_alignment(struct ieee80211_rx_data *rx)
38f3714d
JB		 363{
364#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
a7767f95 365 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
38f3714d
JB		 366 int hdrlen;
367
a7767f95 368 if (!ieee80211_is_data_present(hdr->frame_control))
38f3714d
JB		 369 return;
370
371 /*
372 * Drivers are required to align the payload data in a way that
373 * guarantees that the contained IP header is aligned to a four-
374 * byte boundary. In the case of regular frames, this simply means
375 * aligning the payload to a four-byte boundary (because either
376 * the IP header is directly contained, or IV/RFC1042 headers that
377 * have a length divisible by four are in front of it.
378 *
379 * With A-MSDU frames, however, the payload data address must
380 * yield two modulo four because there are 14-byte 802.3 headers
381 * within the A-MSDU frames that push the IP header further back
382 * to a multiple of four again. Thankfully, the specs were sane
383 * enough this time around to require padding each A-MSDU subframe
384 * to a length that is a multiple of four.
385 *
386 * Padding like atheros hardware adds which is inbetween the 802.11
387 * header and the payload is not supported, the driver is required
388 * to move the 802.11 header further back in that case.
389 */
a7767f95 390 hdrlen = ieee80211_hdrlen(hdr->frame_control);
5cf121c3 391 if (rx->flags & IEEE80211_RX_AMSDU)
38f3714d
JB		 392 hdrlen += ETH_HLEN;
393 WARN_ON_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3);
394#endif
6e0d114d
JB		 395}
396
6368e4b1 397
571ecf67
JB		 398/* rx handlers */
399
49461622 400static ieee80211_rx_result debug_noinline
5cf121c3 401ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
571ecf67
JB		 402{
403 struct ieee80211_local *local = rx->local;
404 struct sk_buff *skb = rx->skb;
405
c2b13452
JB		 406 if (unlikely(local->hw_scanning))
407 return ieee80211_scan_rx(rx->sdata, skb, rx->status);
ece8eddd 408
c2b13452 409 if (unlikely(local->sw_scanning)) {
ece8eddd 410 /* drop all the other packets during a software scan anyway */
c2b13452 411 if (ieee80211_scan_rx(rx->sdata, skb, rx->status)
9ae54c84 412 != RX_QUEUED)
ece8eddd 413 dev_kfree_skb(skb);
9ae54c84 414 return RX_QUEUED;
571ecf67
JB		 415 }
416
5cf121c3 417 if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) {
571ecf67
JB		 418 /* scanning finished during invoking of handlers */
419 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
e4c26add 420 return RX_DROP_UNUSABLE;
571ecf67
JB		 421 }
422
9ae54c84 423 return RX_CONTINUE;
571ecf67
JB		 424}
425
33b64eb2 426static ieee80211_rx_result
5cf121c3 427ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
33b64eb2 428{
a7767f95
HH		 429 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
430 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
d6d1a5a7 431
a7767f95
HH		 432 if (ieee80211_is_data(hdr->frame_control)) {
433 if (!ieee80211_has_a4(hdr->frame_control))
33b64eb2
LCC		 434 return RX_DROP_MONITOR;
435 if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0)
436 return RX_DROP_MONITOR;
437 }
438
439 /* If there is not an established peer link and this is not a peer link
440 * establisment frame, beacon or probe, drop the frame.
441 */
442
b4e08ea1 443 if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) {
33b64eb2 444 struct ieee80211_mgmt *mgmt;
d6d1a5a7 445
a7767f95 446 if (!ieee80211_is_mgmt(hdr->frame_control))
33b64eb2
LCC		 447 return RX_DROP_MONITOR;
448
a7767f95 449 if (ieee80211_is_action(hdr->frame_control)) {
33b64eb2
LCC		 450 mgmt = (struct ieee80211_mgmt *)hdr;
451 if (mgmt->u.action.category != PLINK_CATEGORY)
452 return RX_DROP_MONITOR;
33b64eb2 453 return RX_CONTINUE;
33b64eb2
LCC		 454 }
455
a7767f95
HH		 456 if (ieee80211_is_probe_req(hdr->frame_control) ||
457 ieee80211_is_probe_resp(hdr->frame_control) ||
458 ieee80211_is_beacon(hdr->frame_control))
459 return RX_CONTINUE;
460
461 return RX_DROP_MONITOR;
462
463 }
464
465#define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l))
466
467 if (ieee80211_is_data(hdr->frame_control) &&
468 is_multicast_ether_addr(hdr->addr1) &&
f698d856 469 mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata))
33b64eb2 470 return RX_DROP_MONITOR;
902acc78 471#undef msh_h_get
d6d1a5a7 472
902acc78
JB		 473 return RX_CONTINUE;
474}
33b64eb2
LCC		 475
476
49461622 477static ieee80211_rx_result debug_noinline
5cf121c3 478ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
571ecf67 479{
a7767f95 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 481
482 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
483 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
a7767f95 484 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
5cf121c3 485 rx->sta->last_seq_ctrl[rx->queue] ==
571ecf67 486 hdr->seq_ctrl)) {
5cf121c3 487 if (rx->flags & IEEE80211_RX_RA_MATCH) {
571ecf67
JB		 488 rx->local->dot11FrameDuplicateCount++;
489 rx->sta->num_duplicates++;
490 }
e4c26add 491 return RX_DROP_MONITOR;
571ecf67 492 } else
5cf121c3 493 rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl;
571ecf67
JB		 494 }
495
571ecf67
JB		 496 if (unlikely(rx->skb->len < 16)) {
497 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
e4c26add 498 return RX_DROP_MONITOR;
571ecf67
JB		 499 }
500
571ecf67
JB		 501 /* Drop disallowed frame classes based on STA auth/assoc state;
502 * IEEE 802.11, Chap 5.5.
503 *
ccd7b362
JB		 504 * mac80211 filters only based on association state, i.e. it drops
505 * Class 3 frames from not associated stations. hostapd sends
571ecf67
JB		 506 * deauth/disassoc frames when needed. In addition, hostapd is
507 * responsible for filtering on both auth and assoc states.
508 */
33b64eb2 509
902acc78 510 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
33b64eb2 511 return ieee80211_rx_mesh_check(rx);
33b64eb2 512
a7767f95
HH		 513 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
514 ieee80211_is_pspoll(hdr->frame_control)) &&
05c914fe 515 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
07346f81 516 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) {
a7767f95
HH		 517 if ((!ieee80211_has_fromds(hdr->frame_control) &&
518 !ieee80211_has_tods(hdr->frame_control) &&
519 ieee80211_is_data(hdr->frame_control)) ||
520 !(rx->flags & IEEE80211_RX_RA_MATCH)) {
571ecf67
JB		 521 /* Drop IBSS frames and frames for other hosts
522 * silently. */
e4c26add 523 return RX_DROP_MONITOR;
571ecf67
JB		 524 }
525
e4c26add 526 return RX_DROP_MONITOR;
571ecf67
JB		 527 }
528
9ae54c84 529 return RX_CONTINUE;
570bd537
JB		 530}
531
532
49461622 533static ieee80211_rx_result debug_noinline
5cf121c3 534ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
570bd537 535{
a7767f95 536 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
3017b80b
JB		 537 int keyidx;
538 int hdrlen;
e4c26add 539 ieee80211_rx_result result = RX_DROP_UNUSABLE;
d4e46a3d 540 struct ieee80211_key *stakey = NULL;
570bd537 541
3017b80b
JB		 542 /*
543 * Key selection 101
544 *
545 * There are three types of keys:
546 * - GTK (group keys)
547 * - PTK (pairwise keys)
548 * - STK (station-to-station pairwise keys)
549 *
550 * When selecting a key, we have to distinguish between multicast
551 * (including broadcast) and unicast frames, the latter can only
552 * use PTKs and STKs while the former always use GTKs. Unless, of
553 * course, actual WEP keys ("pre-RSNA") are used, then unicast
554 * frames can also use key indizes like GTKs. Hence, if we don't
555 * have a PTK/STK we check the key index for a WEP key.
556 *
8dc06a1c
JB		 557 * Note that in a regular BSS, multicast frames are sent by the
558 * AP only, associated stations unicast the frame to the AP first
559 * which then multicasts it on their behalf.
560 *
3017b80b
JB		 561 * There is also a slight problem in IBSS mode: GTKs are negotiated
562 * with each station, that is something we don't currently handle.
8dc06a1c
JB		 563 * The spec seems to expect that one negotiates the same key with
564 * every station but there's no such requirement; VLANs could be
565 * possible.
3017b80b
JB		 566 */
567
a7767f95 568 if (!ieee80211_has_protected(hdr->frame_control))
9ae54c84 569 return RX_CONTINUE;
571ecf67 570
3017b80b 571 /*
1990af8d 572 * No point in finding a key and decrypting if the frame is neither
3017b80b
JB		 573 * addressed to us nor a multicast frame.
574 */
5cf121c3 575 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 576 return RX_CONTINUE;
3017b80b 577
d4e46a3d
JB		 578 if (rx->sta)
579 stakey = rcu_dereference(rx->sta->key);
580
581 if (!is_multicast_ether_addr(hdr->addr1) && stakey) {
582 rx->key = stakey;
571ecf67 583 } else {
3017b80b
JB		 584 /*
585 * The device doesn't give us the IV so we won't be
586 * able to look up the key. That's ok though, we
587 * don't need to decrypt the frame, we just won't
588 * be able to keep statistics accurate.
589 * Except for key threshold notifications, should
590 * we somehow allow the driver to tell us which key
591 * the hardware used if this flag is set?
592 */
5cf121c3
JB		 593 if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
594 (rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84 595 return RX_CONTINUE;
3017b80b 596
a7767f95 597 hdrlen = ieee80211_hdrlen(hdr->frame_control);
3017b80b
JB		 598
599 if (rx->skb->len < 8 + hdrlen)
e4c26add 600 return RX_DROP_UNUSABLE; /* TODO: count this? */
3017b80b
JB		 601
602 /*
603 * no need to call ieee80211_wep_get_keyidx,
604 * it verifies a bunch of things we've done already
605 */
606 keyidx = rx->skb->data[hdrlen + 3] >> 6;
607
d4e46a3d 608 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
3017b80b
JB		 609
610 /*
611 * RSNA-protected unicast frames should always be sent with
612 * pairwise or station-to-station keys, but for WEP we allow
613 * using a key index as well.
614 */
8f20fc24 615 if (rx->key && rx->key->conf.alg != ALG_WEP &&
3017b80b
JB		 616 !is_multicast_ether_addr(hdr->addr1))
617 rx->key = NULL;
571ecf67
JB		 618 }
619
3017b80b 620 if (rx->key) {
571ecf67 621 rx->key->tx_rx_count++;
011bfcc4 622 /* TODO: add threshold stuff again */
1990af8d 623 } else {
e4c26add 624 return RX_DROP_MONITOR;
70f08765
JB		 625 }
626
1990af8d
JB		 627 /* Check for weak IVs if possible */
628 if (rx->sta && rx->key->conf.alg == ALG_WEP &&
a7767f95 629 ieee80211_is_data(hdr->frame_control) &&
5cf121c3
JB		 630 (!(rx->status->flag & RX_FLAG_IV_STRIPPED) ||
631 !(rx->status->flag & RX_FLAG_DECRYPTED)) &&
1990af8d
JB		 632 ieee80211_wep_is_weak_iv(rx->skb, rx->key))
633 rx->sta->wep_weak_iv_count++;
634
70f08765
JB		 635 switch (rx->key->conf.alg) {
636 case ALG_WEP:
e2f036da
MN		 637 result = ieee80211_crypto_wep_decrypt(rx);
638 break;
70f08765 639 case ALG_TKIP:
e2f036da
MN		 640 result = ieee80211_crypto_tkip_decrypt(rx);
641 break;
70f08765 642 case ALG_CCMP:
e2f036da
MN		 643 result = ieee80211_crypto_ccmp_decrypt(rx);
644 break;
70f08765
JB		 645 }
646
e2f036da 647 /* either the frame has been decrypted or will be dropped */
5cf121c3 648 rx->status->flag |= RX_FLAG_DECRYPTED;
e2f036da
MN		 649
650 return result;
70f08765
JB		 651}
652
133b8226 653static void ap_sta_ps_start(struct sta_info *sta)
571ecf67 654{
133b8226 655 struct ieee80211_sub_if_data *sdata = sta->sdata;
0795af57
JP		 656 DECLARE_MAC_BUF(mac);
657
3e122be0 658 atomic_inc(&sdata->bss->num_sta_ps);
07346f81 659 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
571ecf67 660#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 661 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
133b8226 662 sdata->dev->name, print_mac(mac, sta->sta.addr), sta->sta.aid);
571ecf67
JB		 663#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
664}
665
133b8226 666static int ap_sta_ps_end(struct sta_info *sta)
571ecf67 667{
133b8226
JB		 668 struct ieee80211_sub_if_data *sdata = sta->sdata;
669 struct ieee80211_local *local = sdata->local;
571ecf67
JB		 670 struct sk_buff *skb;
671 int sent = 0;
e039fa4a 672 struct ieee80211_tx_info *info;
0795af57 673 DECLARE_MAC_BUF(mac);
571ecf67 674
3e122be0 675 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 676
07346f81 677 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
004c872e
JB		 678
679 if (!skb_queue_empty(&sta->ps_tx_buf))
680 sta_info_clear_tim_bit(sta);
681
571ecf67 682#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 683 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
133b8226 684 sdata->dev->name, print_mac(mac, sta->sta.addr), sta->sta.aid);
571ecf67 685#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 686
571ecf67
JB		 687 /* Send all buffered frames to the station */
688 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
e039fa4a 689 info = IEEE80211_SKB_CB(skb);
571ecf67 690 sent++;
e039fa4a 691 info->flags |= IEEE80211_TX_CTL_REQUEUE;
571ecf67
JB		 692 dev_queue_xmit(skb);
693 }
694 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
e039fa4a 695 info = IEEE80211_SKB_CB(skb);
571ecf67
JB		 696 local->total_ps_buffered--;
697 sent++;
698#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 699 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
133b8226 700 "since STA not sleeping anymore\n", sdata->dev->name,
17741cdc 701 print_mac(mac, sta->sta.addr), sta->sta.aid);
571ecf67 702#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e039fa4a 703 info->flags |= IEEE80211_TX_CTL_REQUEUE;
571ecf67
JB		 704 dev_queue_xmit(skb);
705 }
706
707 return sent;
708}
709
49461622 710static ieee80211_rx_result debug_noinline
5cf121c3 711ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 712{
713 struct sta_info *sta = rx->sta;
a7767f95 714 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 715
716 if (!sta)
9ae54c84 717 return RX_CONTINUE;
571ecf67
JB		 718
719 /* Update last_rx only for IBSS packets which are for the current
720 * BSSID to avoid keeping the current IBSS network alive in cases where
721 * other STAs are using different BSSID. */
05c914fe 722 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
71364716 723 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
05c914fe 724 NL80211_IFTYPE_ADHOC);
571ecf67
JB		 725 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
726 sta->last_rx = jiffies;
727 } else
728 if (!is_multicast_ether_addr(hdr->addr1) ||
05c914fe 729 rx->sdata->vif.type == NL80211_IFTYPE_STATION) {
571ecf67
JB		 730 /* Update last_rx only for unicast frames in order to prevent
731 * the Probe Request frames (the only broadcast frames from a
732 * STA in infrastructure mode) from keeping a connection alive.
33b64eb2
LCC		 733 * Mesh beacons will update last_rx when if they are found to
734 * match the current local configuration when processed.
571ecf67
JB		 735 */
736 sta->last_rx = jiffies;
737 }
738
5cf121c3 739 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 740 return RX_CONTINUE;
571ecf67
JB		 741
742 sta->rx_fragments++;
743 sta->rx_bytes += rx->skb->len;
5cf121c3 744 sta->last_signal = rx->status->signal;
566bfe5a 745 sta->last_qual = rx->status->qual;
5cf121c3 746 sta->last_noise = rx->status->noise;
571ecf67 747
3e122be0 748 if (!ieee80211_has_morefrags(hdr->frame_control) &&
05c914fe
JB		 749 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
750 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) {
571ecf67
JB		 751 /* Change STA power saving mode only in the end of a frame
752 * exchange sequence */
07346f81 753 if (test_sta_flags(sta, WLAN_STA_PS) &&
a7767f95 754 !ieee80211_has_pm(hdr->frame_control))
133b8226 755 rx->sent_ps_buffered += ap_sta_ps_end(sta);
07346f81 756 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
a7767f95 757 ieee80211_has_pm(hdr->frame_control))
133b8226 758 ap_sta_ps_start(sta);
571ecf67
JB		 759 }
760
761 /* Drop data::nullfunc frames silently, since they are used only to
762 * control station power saving mode. */
a7767f95 763 if (ieee80211_is_nullfunc(hdr->frame_control)) {
571ecf67
JB		 764 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
765 /* Update counter and free packet here to avoid counting this
766 * as a dropped packed. */
767 sta->rx_packets++;
768 dev_kfree_skb(rx->skb);
9ae54c84 769 return RX_QUEUED;
571ecf67
JB		 770 }
771
9ae54c84 772 return RX_CONTINUE;
571ecf67
JB		 773} /* ieee80211_rx_h_sta_process */
774
571ecf67
JB		 775static inline struct ieee80211_fragment_entry *
776ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
777 unsigned int frag, unsigned int seq, int rx_queue,
778 struct sk_buff **skb)
779{
780 struct ieee80211_fragment_entry *entry;
781 int idx;
782
783 idx = sdata->fragment_next;
784 entry = &sdata->fragments[sdata->fragment_next++];
785 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
786 sdata->fragment_next = 0;
787
788 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 789#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 790 struct ieee80211_hdr *hdr =
791 (struct ieee80211_hdr *) entry->skb_list.next->data;
0795af57
JP		 792 DECLARE_MAC_BUF(mac);
793 DECLARE_MAC_BUF(mac2);
571ecf67
JB		 794 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
795 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0795af57 796 "addr1=%s addr2=%s\n",
571ecf67
JB		 797 sdata->dev->name, idx,
798 jiffies - entry->first_frag_time, entry->seq,
0795af57
JP		 799 entry->last_frag, print_mac(mac, hdr->addr1),
800 print_mac(mac2, hdr->addr2));
f4ea83dd 801#endif
571ecf67
JB		 802 __skb_queue_purge(&entry->skb_list);
803 }
804
805 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
806 *skb = NULL;
807 entry->first_frag_time = jiffies;
808 entry->seq = seq;
809 entry->rx_queue = rx_queue;
810 entry->last_frag = frag;
811 entry->ccmp = 0;
812 entry->extra_len = 0;
813
814 return entry;
815}
816
817static inline struct ieee80211_fragment_entry *
818ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 819 unsigned int frag, unsigned int seq,
571ecf67
JB		 820 int rx_queue, struct ieee80211_hdr *hdr)
821{
822 struct ieee80211_fragment_entry *entry;
823 int i, idx;
824
825 idx = sdata->fragment_next;
826 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
827 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 828
829 idx--;
830 if (idx < 0)
831 idx = IEEE80211_FRAGMENT_MAX - 1;
832
833 entry = &sdata->fragments[idx];
834 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
835 entry->rx_queue != rx_queue ||
836 entry->last_frag + 1 != frag)
837 continue;
838
b73d70ad 839 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 840
b73d70ad
HH		 841 /*
842 * Check ftype and addresses are equal, else check next fragment
843 */
844 if (((hdr->frame_control ^ f_hdr->frame_control) &
845 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 846 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
847 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
848 continue;
849
ab46623e 850 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 851 __skb_queue_purge(&entry->skb_list);
852 continue;
853 }
854 return entry;
855 }
856
857 return NULL;
858}
859
49461622 860static ieee80211_rx_result debug_noinline
5cf121c3 861ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 862{
863 struct ieee80211_hdr *hdr;
864 u16 sc;
358c8d9d 865 __le16 fc;
571ecf67
JB		 866 unsigned int frag, seq;
867 struct ieee80211_fragment_entry *entry;
868 struct sk_buff *skb;
0795af57 869 DECLARE_MAC_BUF(mac);
571ecf67 870
b73d70ad 871 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 872 fc = hdr->frame_control;
571ecf67
JB		 873 sc = le16_to_cpu(hdr->seq_ctrl);
874 frag = sc & IEEE80211_SCTL_FRAG;
875
358c8d9d 876 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 877 (rx->skb)->len < 24 ||
878 is_multicast_ether_addr(hdr->addr1))) {
879 /* not fragmented */
880 goto out;
881 }
882 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
883
884 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
885
886 if (frag == 0) {
887 /* This is the first fragment of a new frame. */
888 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 889 rx->queue, &(rx->skb));
8f20fc24 890 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 891 ieee80211_has_protected(fc)) {
571ecf67
JB		 892 /* Store CCMP PN so that we can verify that the next
893 * fragment has a sequential PN value. */
894 entry->ccmp = 1;
895 memcpy(entry->last_pn,
5cf121c3 896 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 897 CCMP_PN_LEN);
898 }
9ae54c84 899 return RX_QUEUED;
571ecf67
JB		 900 }
901
902 /* This is a fragment for a frame that should already be pending in
903 * fragment cache. Add this fragment to the end of the pending entry.
904 */
b73d70ad 905 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 906 if (!entry) {
907 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 908 return RX_DROP_MONITOR;
571ecf67
JB		 909 }
910
911 /* Verify that MPDUs within one MSDU have sequential PN values.
912 * (IEEE 802.11i, 8.3.3.4.5) */
913 if (entry->ccmp) {
914 int i;
915 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 916 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 917 return RX_DROP_UNUSABLE;
571ecf67
JB		 918 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
919 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
920 pn[i]++;
921 if (pn[i])
922 break;
923 }
5cf121c3 924 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 925 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 926 return RX_DROP_UNUSABLE;
571ecf67
JB		 927 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
928 }
929
358c8d9d 930 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 931 __skb_queue_tail(&entry->skb_list, rx->skb);
932 entry->last_frag = frag;
933 entry->extra_len += rx->skb->len;
358c8d9d 934 if (ieee80211_has_morefrags(fc)) {
571ecf67 935 rx->skb = NULL;
9ae54c84 936 return RX_QUEUED;
571ecf67
JB		 937 }
938
939 rx->skb = __skb_dequeue(&entry->skb_list);
940 if (skb_tailroom(rx->skb) < entry->extra_len) {
941 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
942 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
943 GFP_ATOMIC))) {
944 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
945 __skb_queue_purge(&entry->skb_list);
e4c26add 946 return RX_DROP_UNUSABLE;
571ecf67
JB		 947 }
948 }
949 while ((skb = __skb_dequeue(&entry->skb_list))) {
950 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
951 dev_kfree_skb(skb);
952 }
953
954 /* Complete frame has been reassembled - process it now */
5cf121c3 955 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 956
957 out:
958 if (rx->sta)
959 rx->sta->rx_packets++;
960 if (is_multicast_ether_addr(hdr->addr1))
961 rx->local->dot11MulticastReceivedFrameCount++;
962 else
963 ieee80211_led_rx(rx->local);
9ae54c84 964 return RX_CONTINUE;
571ecf67
JB		 965}
966
49461622 967static ieee80211_rx_result debug_noinline
5cf121c3 968ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 969{
98f0b0a3 970 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67
JB		 971 struct sk_buff *skb;
972 int no_pending_pkts;
0795af57 973 DECLARE_MAC_BUF(mac);
358c8d9d 974 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 975
358c8d9d 976 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 977 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 978 return RX_CONTINUE;
571ecf67 979
05c914fe
JB		 980 if ((sdata->vif.type != NL80211_IFTYPE_AP) &&
981 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
e4c26add 982 return RX_DROP_UNUSABLE;
98f0b0a3 983
571ecf67
JB		 984 skb = skb_dequeue(&rx->sta->tx_filtered);
985 if (!skb) {
986 skb = skb_dequeue(&rx->sta->ps_tx_buf);
987 if (skb)
988 rx->local->total_ps_buffered--;
989 }
990 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
991 skb_queue_empty(&rx->sta->ps_tx_buf);
992
993 if (skb) {
994 struct ieee80211_hdr *hdr =
995 (struct ieee80211_hdr *) skb->data;
996
4a9a66e9
JB		 997 /*
998 * Tell TX path to send one frame even though the STA may
999 * still remain is PS mode after this frame exchange.
1000 */
07346f81 1001 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67
JB		 1002
1003#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 1004 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
17741cdc 1005 print_mac(mac, rx->sta->sta.addr), rx->sta->sta.aid,
571ecf67
JB		 1006 skb_queue_len(&rx->sta->ps_tx_buf));
1007#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1008
1009 /* Use MoreData flag to indicate whether there are more
1010 * buffered frames for this STA */
836341a7 1011 if (no_pending_pkts)
571ecf67 1012 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
836341a7 1013 else
571ecf67
JB		 1014 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1015
1016 dev_queue_xmit(skb);
1017
004c872e
JB		 1018 if (no_pending_pkts)
1019 sta_info_clear_tim_bit(rx->sta);
571ecf67 1020#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
5cf121c3 1021 } else if (!rx->sent_ps_buffered) {
004c872e
JB		 1022 /*
1023 * FIXME: This can be the result of a race condition between
1024 * us expiring a frame and the station polling for it.
1025 * Should we send it a null-func frame indicating we
1026 * have nothing buffered for it?
1027 */
0795af57 1028 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
f4ea83dd 1029 "though there are no buffered frames for it\n",
17741cdc 1030 rx->dev->name, print_mac(mac, rx->sta->sta.addr));
571ecf67 1031#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 1032 }
1033
9ae54c84 1034 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1035 * count as an dropped frame. */
1036 dev_kfree_skb(rx->skb);
1037
9ae54c84 1038 return RX_QUEUED;
571ecf67
JB		 1039}
1040
49461622 1041static ieee80211_rx_result debug_noinline
5cf121c3 1042ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1043{
6e0d114d 1044 u8 *data = rx->skb->data;
238f74a2 1045 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1046
238f74a2 1047 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1048 return RX_CONTINUE;
6e0d114d
JB		 1049
1050 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1051 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1052 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1053 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1054 /* change frame type to non QOS */
238f74a2 1055 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1056
9ae54c84 1057 return RX_CONTINUE;
6e0d114d
JB		 1058}
1059
76ee65bf 1060static int
5cf121c3 1061ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1062{
07346f81 1063 if (unlikely(!rx->sta ||
f4ea83dd 1064 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1065 return -EACCES;
571ecf67 1066
76ee65bf 1067 return 0;
571ecf67
JB		 1068}
1069
76ee65bf 1070static int
358c8d9d 1071ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1072{
3017b80b 1073 /*
7848ba7d
JB		 1074 * Pass through unencrypted frames if the hardware has
1075 * decrypted them already.
3017b80b 1076 */
5cf121c3 1077 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1078 return 0;
571ecf67
JB		 1079
1080 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1081 if (unlikely(!ieee80211_has_protected(fc) &&
1082 !ieee80211_is_nullfunc(fc) &&
b3fc9c6c 1083 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1084 return -EACCES;
b3fc9c6c 1085
76ee65bf 1086 return 0;
571ecf67
JB		 1087}
1088
76ee65bf 1089static int
5cf121c3 1090ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1091{
1092 struct net_device *dev = rx->dev;
571ecf67 1093 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
b73d70ad 1094 u16 hdrlen, ethertype;
571ecf67
JB		 1095 u8 *payload;
1096 u8 dst[ETH_ALEN];
c97c23e3 1097 u8 src[ETH_ALEN] __aligned(2);
76ee65bf 1098 struct sk_buff *skb = rx->skb;
571ecf67 1099 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0795af57
JP		 1100 DECLARE_MAC_BUF(mac);
1101 DECLARE_MAC_BUF(mac2);
1102 DECLARE_MAC_BUF(mac3);
1103 DECLARE_MAC_BUF(mac4);
571ecf67 1104
b73d70ad 1105 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
76ee65bf 1106 return -1;
571ecf67 1107
b73d70ad 1108 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1109
1110 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1111 * header
1112 * IEEE 802.11 address fields:
1113 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1114 * 0 0 DA SA BSSID n/a
1115 * 0 1 DA BSSID SA n/a
1116 * 1 0 BSSID SA DA n/a
1117 * 1 1 RA TA DA SA
1118 */
b73d70ad
HH		 1119 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1120 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
571ecf67 1121
b73d70ad
HH		 1122 switch (hdr->frame_control &
1123 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1124 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
05c914fe
JB		 1125 if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP &&
1126 sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
76ee65bf 1127 return -1;
571ecf67 1128 break;
b73d70ad 1129 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
05c914fe
JB		 1130 if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS &&
1131 sdata->vif.type != NL80211_IFTYPE_MESH_POINT))
76ee65bf 1132 return -1;
79617dee
Y		 1133 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1134 struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *)
1135 (skb->data + hdrlen);
1136 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
1137 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
1138 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
1139 memcpy(src, meshdr->eaddr2, ETH_ALEN);
1140 }
1141 }
571ecf67 1142 break;
b73d70ad 1143 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
05c914fe 1144 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
b3316157
JL		 1145 (is_multicast_ether_addr(dst) &&
1146 !compare_ether_addr(src, dev->dev_addr)))
76ee65bf 1147 return -1;
571ecf67 1148 break;
b73d70ad 1149 case __constant_cpu_to_le16(0):
05c914fe 1150 if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
76ee65bf 1151 return -1;
571ecf67
JB		 1152 break;
1153 }
1154
f4ea83dd 1155 if (unlikely(skb->len - hdrlen < 8))
76ee65bf 1156 return -1;
571ecf67 1157
76ee65bf 1158 payload = skb->data + hdrlen;
571ecf67
JB		 1159 ethertype = (payload[6] << 8) | payload[7];
1160
1161 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
1162 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1163 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
1164 /* remove RFC1042 or Bridge-Tunnel encapsulation and
1165 * replace EtherType */
1166 skb_pull(skb, hdrlen + 6);
1167 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
1168 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
1169 } else {
1170 struct ethhdr *ehdr;
1171 __be16 len;
ce3edf6d 1172
571ecf67
JB		 1173 skb_pull(skb, hdrlen);
1174 len = htons(skb->len);
1175 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
1176 memcpy(ehdr->h_dest, dst, ETH_ALEN);
1177 memcpy(ehdr->h_source, src, ETH_ALEN);
1178 ehdr->h_proto = len;
1179 }
76ee65bf
RR		 1180 return 0;
1181}
571ecf67 1182
ce3edf6d
JB		 1183/*
1184 * requires that rx->skb is a frame with ethernet header
1185 */
358c8d9d 1186static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
ce3edf6d 1187{
c97c23e3 1188 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
ce3edf6d
JB		 1189 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
1190 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1191
1192 /*
1193 * Allow EAPOL frames to us/the PAE group address regardless
1194 * of whether the frame was encrypted or not.
1195 */
1196 if (ehdr->h_proto == htons(ETH_P_PAE) &&
1197 (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 ||
1198 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0))
1199 return true;
1200
1201 if (ieee80211_802_1x_port_control(rx) ||
358c8d9d 1202 ieee80211_drop_unencrypted(rx, fc))
ce3edf6d
JB		 1203 return false;
1204
1205 return true;
1206}
1207
1208/*
1209 * requires that rx->skb is a frame with ethernet header
1210 */
76ee65bf 1211static void
5cf121c3 1212ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1213{
1214 struct net_device *dev = rx->dev;
1215 struct ieee80211_local *local = rx->local;
1216 struct sk_buff *skb, *xmit_skb;
1217 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ce3edf6d
JB		 1218 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
1219 struct sta_info *dsta;
571ecf67 1220
76ee65bf
RR		 1221 skb = rx->skb;
1222 xmit_skb = NULL;
571ecf67 1223
05c914fe
JB		 1224 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
1225 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
213cd118 1226 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
5cf121c3 1227 (rx->flags & IEEE80211_RX_RA_MATCH)) {
ce3edf6d
JB		 1228 if (is_multicast_ether_addr(ehdr->h_dest)) {
1229 /*
1230 * send multicast frames both to higher layers in
1231 * local net stack and back to the wireless medium
1232 */
76ee65bf
RR		 1233 xmit_skb = skb_copy(skb, GFP_ATOMIC);
1234 if (!xmit_skb && net_ratelimit())
571ecf67
JB		 1235 printk(KERN_DEBUG "%s: failed to clone "
1236 "multicast frame\n", dev->name);
1237 } else {
571ecf67 1238 dsta = sta_info_get(local, skb->data);
d0709a65 1239 if (dsta && dsta->sdata->dev == dev) {
ce3edf6d
JB		 1240 /*
1241 * The destination station is associated to
1242 * this AP (in this VLAN), so send the frame
1243 * directly to it and do not pass it to local
1244 * net stack.
571ecf67 1245 */
76ee65bf 1246 xmit_skb = skb;
571ecf67
JB		 1247 skb = NULL;
1248 }
571ecf67
JB		 1249 }
1250 }
1251
1252 if (skb) {
1253 /* deliver to local stack */
1254 skb->protocol = eth_type_trans(skb, dev);
1255 memset(skb->cb, 0, sizeof(skb->cb));
1256 netif_rx(skb);
1257 }
1258
76ee65bf 1259 if (xmit_skb) {
571ecf67 1260 /* send to wireless media */
f831e909 1261 xmit_skb->protocol = htons(ETH_P_802_3);
ce3edf6d
JB		 1262 skb_reset_network_header(xmit_skb);
1263 skb_reset_mac_header(xmit_skb);
76ee65bf 1264 dev_queue_xmit(xmit_skb);
571ecf67 1265 }
76ee65bf
RR		 1266}
1267
49461622 1268static ieee80211_rx_result debug_noinline
5cf121c3 1269ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
fd4c7f2f
RR		 1270{
1271 struct net_device *dev = rx->dev;
1272 struct ieee80211_local *local = rx->local;
358c8d9d 1273 u16 ethertype;
fd4c7f2f
RR		 1274 u8 *payload;
1275 struct sk_buff *skb = rx->skb, *frame = NULL;
358c8d9d
HH		 1276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277 __le16 fc = hdr->frame_control;
fd4c7f2f
RR		 1278 const struct ethhdr *eth;
1279 int remaining, err;
1280 u8 dst[ETH_ALEN];
1281 u8 src[ETH_ALEN];
1282 DECLARE_MAC_BUF(mac);
1283
358c8d9d 1284 if (unlikely(!ieee80211_is_data(fc)))
9ae54c84 1285 return RX_CONTINUE;
fd4c7f2f 1286
358c8d9d 1287 if (unlikely(!ieee80211_is_data_present(fc)))
e4c26add 1288 return RX_DROP_MONITOR;
fd4c7f2f 1289
5cf121c3 1290 if (!(rx->flags & IEEE80211_RX_AMSDU))
9ae54c84 1291 return RX_CONTINUE;
fd4c7f2f
RR		 1292
1293 err = ieee80211_data_to_8023(rx);
1294 if (unlikely(err))
e4c26add 1295 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1296
1297 skb->dev = dev;
1298
1299 dev->stats.rx_packets++;
1300 dev->stats.rx_bytes += skb->len;
1301
1302 /* skip the wrapping header */
1303 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
1304 if (!eth)
e4c26add 1305 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1306
1307 while (skb != frame) {
1308 u8 padding;
1309 __be16 len = eth->h_proto;
1310 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
1311
1312 remaining = skb->len;
1313 memcpy(dst, eth->h_dest, ETH_ALEN);
1314 memcpy(src, eth->h_source, ETH_ALEN);
1315
1316 padding = ((4 - subframe_len) & 0x3);
1317 /* the last MSDU has no padding */
f4ea83dd 1318 if (subframe_len > remaining)
e4c26add 1319 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1320
1321 skb_pull(skb, sizeof(struct ethhdr));
1322 /* if last subframe reuse skb */
1323 if (remaining <= subframe_len + padding)
1324 frame = skb;
1325 else {
1326 frame = dev_alloc_skb(local->hw.extra_tx_headroom +
1327 subframe_len);
1328
1329 if (frame == NULL)
e4c26add 1330 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1331
1332 skb_reserve(frame, local->hw.extra_tx_headroom +
1333 sizeof(struct ethhdr));
1334 memcpy(skb_put(frame, ntohs(len)), skb->data,
1335 ntohs(len));
1336
1337 eth = (struct ethhdr *) skb_pull(skb, ntohs(len) +
1338 padding);
1339 if (!eth) {
fd4c7f2f 1340 dev_kfree_skb(frame);
e4c26add 1341 return RX_DROP_UNUSABLE;
fd4c7f2f
RR		 1342 }
1343 }
1344
ce3edf6d 1345 skb_reset_network_header(frame);
fd4c7f2f
RR		 1346 frame->dev = dev;
1347 frame->priority = skb->priority;
1348 rx->skb = frame;
1349
fd4c7f2f
RR		 1350 payload = frame->data;
1351 ethertype = (payload[6] << 8) | payload[7];
1352
1353 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
ce3edf6d
JB		 1354 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1355 compare_ether_addr(payload,
1356 bridge_tunnel_header) == 0)) {
fd4c7f2f
RR		 1357 /* remove RFC1042 or Bridge-Tunnel
1358 * encapsulation and replace EtherType */
1359 skb_pull(frame, 6);
1360 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1361 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1362 } else {
ce3edf6d
JB		 1363 memcpy(skb_push(frame, sizeof(__be16)),
1364 &len, sizeof(__be16));
fd4c7f2f
RR		 1365 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
1366 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
1367 }
1368
358c8d9d 1369 if (!ieee80211_frame_allowed(rx, fc)) {
ce3edf6d 1370 if (skb == frame) /* last frame */
e4c26add 1371 return RX_DROP_UNUSABLE;
ce3edf6d
JB		 1372 dev_kfree_skb(frame);
1373 continue;
1374 }
fd4c7f2f
RR		 1375
1376 ieee80211_deliver_skb(rx);
1377 }
1378
9ae54c84 1379 return RX_QUEUED;
fd4c7f2f
RR		 1380}
1381
b0dee578 1382static ieee80211_rx_result
e32f85f7
LCC		 1383ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1384{
1385 struct ieee80211_hdr *hdr;
1386 struct ieee80211s_hdr *mesh_hdr;
1387 unsigned int hdrlen;
1388 struct sk_buff *skb = rx->skb, *fwd_skb;
1389
1390 hdr = (struct ieee80211_hdr *) skb->data;
1391 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1392 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
1393
1394 if (!ieee80211_is_data(hdr->frame_control))
1395 return RX_CONTINUE;
1396
1397 if (!mesh_hdr->ttl)
1398 /* illegal frame */
1399 return RX_DROP_MONITOR;
1400
79617dee
Y		 1401 if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){
1402 struct ieee80211_sub_if_data *sdata;
1403 struct mesh_path *mppath;
1404
1405 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1406 rcu_read_lock();
1407 mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata);
1408 if (!mppath) {
1409 mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata);
1410 } else {
1411 spin_lock_bh(&mppath->state_lock);
1412 mppath->exp_time = jiffies;
1413 if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0)
1414 memcpy(mppath->mpp, hdr->addr4, ETH_ALEN);
1415 spin_unlock_bh(&mppath->state_lock);
1416 }
1417 rcu_read_unlock();
1418 }
1419
e32f85f7
LCC		 1420 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1421 return RX_CONTINUE;
1422
1423 mesh_hdr->ttl--;
1424
1425 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1426 if (!mesh_hdr->ttl)
472dbc45 1427 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1428 dropped_frames_ttl);
1429 else {
1430 struct ieee80211_hdr *fwd_hdr;
1431 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1432
1433 if (!fwd_skb && net_ratelimit())
1434 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1435 rx->dev->name);
1436
1437 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1438 /*
1439 * Save TA to addr1 to send TA a path error if a
1440 * suitable next hop is not found
1441 */
1442 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1443 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1444 fwd_skb->dev = rx->local->mdev;
1445 fwd_skb->iif = rx->dev->ifindex;
1446 dev_queue_xmit(fwd_skb);
1447 }
1448 }
1449
1450 if (is_multicast_ether_addr(hdr->addr3) ||
1451 rx->dev->flags & IFF_PROMISC)
1452 return RX_CONTINUE;
1453 else
1454 return RX_DROP_MONITOR;
1455}
1456
1457
49461622 1458static ieee80211_rx_result debug_noinline
5cf121c3 1459ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1460{
1461 struct net_device *dev = rx->dev;
358c8d9d
HH		 1462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1463 __le16 fc = hdr->frame_control;
ce3edf6d 1464 int err;
76ee65bf 1465
358c8d9d 1466 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1467 return RX_CONTINUE;
76ee65bf 1468
358c8d9d 1469 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1470 return RX_DROP_MONITOR;
76ee65bf 1471
76ee65bf
RR		 1472 err = ieee80211_data_to_8023(rx);
1473 if (unlikely(err))
e4c26add 1474 return RX_DROP_UNUSABLE;
76ee65bf 1475
358c8d9d 1476 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1477 return RX_DROP_MONITOR;
ce3edf6d 1478
76ee65bf
RR		 1479 rx->skb->dev = dev;
1480
1481 dev->stats.rx_packets++;
1482 dev->stats.rx_bytes += rx->skb->len;
1483
1484 ieee80211_deliver_skb(rx);
571ecf67 1485
9ae54c84 1486 return RX_QUEUED;
571ecf67
JB		 1487}
1488
49461622 1489static ieee80211_rx_result debug_noinline
5cf121c3 1490ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1491{
1492 struct ieee80211_local *local = rx->local;
1493 struct ieee80211_hw *hw = &local->hw;
1494 struct sk_buff *skb = rx->skb;
a7767f95 1495 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1496 struct tid_ampdu_rx *tid_agg_rx;
1497 u16 start_seq_num;
1498 u16 tid;
1499
a7767f95 1500 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1501 return RX_CONTINUE;
71364716 1502
a7767f95 1503 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1504 if (!rx->sta)
9ae54c84 1505 return RX_CONTINUE;
71364716 1506 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1507 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1508 != HT_AGG_STATE_OPERATIONAL)
9ae54c84 1509 return RX_CONTINUE;
cee24a3e 1510 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1511
1512 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1513
1514 /* reset session timer */
1515 if (tid_agg_rx->timeout) {
1516 unsigned long expires =
1517 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1518 mod_timer(&tid_agg_rx->session_timer, expires);
1519 }
1520
1521 /* manage reordering buffer according to requested */
1522 /* sequence number */
1523 rcu_read_lock();
1524 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1525 start_seq_num, 1);
1526 rcu_read_unlock();
e4c26add 1527 return RX_DROP_UNUSABLE;
71364716
RR		 1528 }
1529
9ae54c84 1530 return RX_CONTINUE;
71364716
RR		 1531}
1532
de1ede7a
JB		 1533static ieee80211_rx_result debug_noinline
1534ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1535{
1536 struct ieee80211_local *local = rx->local;
1537 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1538 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1539 int len = rx->skb->len;
1540
1541 if (!ieee80211_is_action(mgmt->frame_control))
1542 return RX_CONTINUE;
1543
1544 if (!rx->sta)
1545 return RX_DROP_MONITOR;
1546
1547 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1548 return RX_DROP_MONITOR;
1549
1550 /* all categories we currently handle have action_code */
1551 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1552 return RX_DROP_MONITOR;
1553
1554 /*
1555 * FIXME: revisit this, I'm sure we should handle most
1556 * of these frames in other modes as well!
1557 */
05c914fe
JB		 1558 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1559 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2ff6a6d4 1560 return RX_CONTINUE;
de1ede7a
JB		 1561
1562 switch (mgmt->u.action.category) {
1563 case WLAN_CATEGORY_BACK:
1564 switch (mgmt->u.action.u.addba_req.action_code) {
1565 case WLAN_ACTION_ADDBA_REQ:
1566 if (len < (IEEE80211_MIN_ACTION_SIZE +
1567 sizeof(mgmt->u.action.u.addba_req)))
1568 return RX_DROP_MONITOR;
1569 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1570 break;
1571 case WLAN_ACTION_ADDBA_RESP:
1572 if (len < (IEEE80211_MIN_ACTION_SIZE +
1573 sizeof(mgmt->u.action.u.addba_resp)))
1574 return RX_DROP_MONITOR;
1575 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1576 break;
1577 case WLAN_ACTION_DELBA:
1578 if (len < (IEEE80211_MIN_ACTION_SIZE +
1579 sizeof(mgmt->u.action.u.delba)))
1580 return RX_DROP_MONITOR;
1581 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1582 break;
1583 }
39192c0b
JB		 1584 break;
1585 case WLAN_CATEGORY_SPECTRUM_MGMT:
1586 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1587 return RX_DROP_MONITOR;
1588 switch (mgmt->u.action.u.measurement.action_code) {
1589 case WLAN_ACTION_SPCT_MSR_REQ:
1590 if (len < (IEEE80211_MIN_ACTION_SIZE +
1591 sizeof(mgmt->u.action.u.measurement)))
1592 return RX_DROP_MONITOR;
1593 ieee80211_process_measurement_req(sdata, mgmt, len);
1594 break;
1595 }
1596 break;
1597 default:
1598 return RX_CONTINUE;
de1ede7a
JB		 1599 }
1600
39192c0b
JB		 1601 rx->sta->rx_packets++;
1602 dev_kfree_skb(rx->skb);
1603 return RX_QUEUED;
de1ede7a
JB		 1604}
1605
49461622 1606static ieee80211_rx_result debug_noinline
5cf121c3 1607ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1608{
759ef3eb 1609 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67 1610
5cf121c3 1611 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1612 return RX_DROP_MONITOR;
571ecf67 1613
472dbc45
JB		 1614 if (ieee80211_vif_is_mesh(&sdata->vif))
1615 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1616
05c914fe
JB		 1617 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
1618 sdata->vif.type != NL80211_IFTYPE_ADHOC)
759ef3eb
JB		 1619 return RX_DROP_MONITOR;
1620
1621 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
e4c26add 1622 return RX_DROP_MONITOR;
f9d540ee 1623
759ef3eb 1624 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
9ae54c84 1625 return RX_QUEUED;
571ecf67
JB		 1626}
1627
571ecf67
JB		 1628static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1629 struct ieee80211_hdr *hdr,
5cf121c3 1630 struct ieee80211_rx_data *rx)
571ecf67 1631{
a7767f95
HH		 1632 int keyidx;
1633 unsigned int hdrlen;
0795af57
JP		 1634 DECLARE_MAC_BUF(mac);
1635 DECLARE_MAC_BUF(mac2);
571ecf67 1636
a7767f95 1637 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1638 if (rx->skb->len >= hdrlen + 4)
1639 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1640 else
1641 keyidx = -1;
1642
8944b79f 1643 if (!rx->sta) {
aa0daf0e
JB		 1644 /*
1645 * Some hardware seem to generate incorrect Michael MIC
1646 * reports; ignore them to avoid triggering countermeasures.
1647 */
571ecf67
JB		 1648 goto ignore;
1649 }
1650
a7767f95 1651 if (!ieee80211_has_protected(hdr->frame_control))
571ecf67 1652 goto ignore;
571ecf67 1653
05c914fe 1654 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) {
aa0daf0e
JB		 1655 /*
1656 * APs with pairwise keys should never receive Michael MIC
1657 * errors for non-zero keyidx because these are reserved for
1658 * group keys and only the AP is sending real multicast
1659 * frames in the BSS.
1660 */
eb063c17 1661 goto ignore;
571ecf67
JB		 1662 }
1663
a7767f95
HH		 1664 if (!ieee80211_is_data(hdr->frame_control) &&
1665 !ieee80211_is_auth(hdr->frame_control))
571ecf67 1666 goto ignore;
571ecf67 1667
f698d856 1668 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
571ecf67
JB		 1669 ignore:
1670 dev_kfree_skb(rx->skb);
1671 rx->skb = NULL;
1672}
1673
5cf121c3
JB		 1674/* TODO: use IEEE80211_RX_FRAGMENTED */
1675static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1676{
1677 struct ieee80211_sub_if_data *sdata;
1678 struct ieee80211_local *local = rx->local;
1679 struct ieee80211_rtap_hdr {
1680 struct ieee80211_radiotap_header hdr;
1681 u8 flags;
1682 u8 rate;
1683 __le16 chan_freq;
1684 __le16 chan_flags;
1685 } __attribute__ ((packed)) *rthdr;
1686 struct sk_buff *skb = rx->skb, *skb2;
1687 struct net_device *prev_dev = NULL;
5cf121c3 1688 struct ieee80211_rx_status *status = rx->status;
3d30d949 1689
5cf121c3 1690 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1691 goto out_free_skb;
1692
1693 if (skb_headroom(skb) < sizeof(*rthdr) &&
1694 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1695 goto out_free_skb;
1696
1697 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1698 memset(rthdr, 0, sizeof(*rthdr));
1699 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1700 rthdr->hdr.it_present =
1701 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1702 (1 << IEEE80211_RADIOTAP_RATE) |
1703 (1 << IEEE80211_RADIOTAP_CHANNEL));
1704
5cf121c3 1705 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1706 rthdr->chan_freq = cpu_to_le16(status->freq);
1707
1708 if (status->band == IEEE80211_BAND_5GHZ)
1709 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1710 IEEE80211_CHAN_5GHZ);
1711 else
1712 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1713 IEEE80211_CHAN_2GHZ);
1714
1715 skb_set_mac_header(skb, 0);
1716 skb->ip_summed = CHECKSUM_UNNECESSARY;
1717 skb->pkt_type = PACKET_OTHERHOST;
1718 skb->protocol = htons(ETH_P_802_2);
1719
1720 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1721 if (!netif_running(sdata->dev))
1722 continue;
1723
05c914fe 1724 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
3d30d949
MW		 1725 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1726 continue;
1727
1728 if (prev_dev) {
1729 skb2 = skb_clone(skb, GFP_ATOMIC);
1730 if (skb2) {
1731 skb2->dev = prev_dev;
1732 netif_rx(skb2);
1733 }
1734 }
1735
1736 prev_dev = sdata->dev;
1737 sdata->dev->stats.rx_packets++;
1738 sdata->dev->stats.rx_bytes += skb->len;
1739 }
1740
1741 if (prev_dev) {
1742 skb->dev = prev_dev;
1743 netif_rx(skb);
1744 skb = NULL;
1745 } else
1746 goto out_free_skb;
1747
5cf121c3 1748 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 1749 return;
1750
1751 out_free_skb:
1752 dev_kfree_skb(skb);
1753}
1754
571ecf67 1755
8944b79f 1756static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1757 struct ieee80211_rx_data *rx,
8944b79f 1758 struct sk_buff *skb)
58905290 1759{
58905290
JB		 1760 ieee80211_rx_result res = RX_DROP_MONITOR;
1761
8944b79f
JB		 1762 rx->skb = skb;
1763 rx->sdata = sdata;
1764 rx->dev = sdata->dev;
1765
e32f85f7
LCC		 1766#define CALL_RXH(rxh) \
1767 do { \
1768 res = rxh(rx); \
1769 if (res != RX_CONTINUE) \
1770 goto rxh_done; \
1771 } while (0);
49461622
JB		 1772
1773 CALL_RXH(ieee80211_rx_h_passive_scan)
1774 CALL_RXH(ieee80211_rx_h_check)
1775 CALL_RXH(ieee80211_rx_h_decrypt)
1776 CALL_RXH(ieee80211_rx_h_sta_process)
1777 CALL_RXH(ieee80211_rx_h_defragment)
1778 CALL_RXH(ieee80211_rx_h_ps_poll)
1779 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1780 /* must be after MMIC verify so header is counted in MPDU mic */
1781 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1782 CALL_RXH(ieee80211_rx_h_amsdu)
e32f85f7
LCC		 1783 if (ieee80211_vif_is_mesh(&sdata->vif))
1784 CALL_RXH(ieee80211_rx_h_mesh_fwding);
49461622
JB		 1785 CALL_RXH(ieee80211_rx_h_data)
1786 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 1787 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 1788 CALL_RXH(ieee80211_rx_h_mgmt)
1789
1790#undef CALL_RXH
1791
1792 rxh_done:
58905290
JB		 1793 switch (res) {
1794 case RX_DROP_MONITOR:
49461622
JB		 1795 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1796 if (rx->sta)
1797 rx->sta->rx_dropped++;
1798 /* fall through */
1799 case RX_CONTINUE:
3d30d949
MW		 1800 ieee80211_rx_cooked_monitor(rx);
1801 break;
58905290 1802 case RX_DROP_UNUSABLE:
49461622
JB		 1803 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1804 if (rx->sta)
1805 rx->sta->rx_dropped++;
58905290
JB		 1806 dev_kfree_skb(rx->skb);
1807 break;
49461622
JB		 1808 case RX_QUEUED:
1809 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1810 break;
58905290
JB		 1811 }
1812}
1813
571ecf67
JB		 1814/* main receive path */
1815
23a24def 1816static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1817 u8 *bssid, struct ieee80211_rx_data *rx,
23a24def
JB		 1818 struct ieee80211_hdr *hdr)
1819{
1820 int multicast = is_multicast_ether_addr(hdr->addr1);
1821
51fb61e7 1822 switch (sdata->vif.type) {
05c914fe 1823 case NL80211_IFTYPE_STATION:
23a24def
JB		 1824 if (!bssid)
1825 return 0;
1826 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
5cf121c3 1827 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 1828 return 0;
5cf121c3 1829 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1830 } else if (!multicast &&
1831 compare_ether_addr(sdata->dev->dev_addr,
1832 hdr->addr1) != 0) {
4150c572 1833 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1834 return 0;
5cf121c3 1835 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1836 }
1837 break;
05c914fe 1838 case NL80211_IFTYPE_ADHOC:
23a24def
JB		 1839 if (!bssid)
1840 return 0;
a7767f95 1841 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 1842 return 1;
87291c02 1843 }
9d9bf77d 1844 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
5cf121c3 1845 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 1846 return 0;
5cf121c3 1847 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1848 } else if (!multicast &&
1849 compare_ether_addr(sdata->dev->dev_addr,
1850 hdr->addr1) != 0) {
4150c572 1851 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1852 return 0;
5cf121c3 1853 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 1854 } else if (!rx->sta)
f698d856 1855 rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
87291c02
VK		 1856 bssid, hdr->addr2,
1857 BIT(rx->status->rate_idx));
23a24def 1858 break;
05c914fe 1859 case NL80211_IFTYPE_MESH_POINT:
6032f934
JB		 1860 if (!multicast &&
1861 compare_ether_addr(sdata->dev->dev_addr,
1862 hdr->addr1) != 0) {
1863 if (!(sdata->dev->flags & IFF_PROMISC))
1864 return 0;
1865
5cf121c3 1866 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 1867 }
1868 break;
05c914fe
JB		 1869 case NL80211_IFTYPE_AP_VLAN:
1870 case NL80211_IFTYPE_AP:
23a24def
JB		 1871 if (!bssid) {
1872 if (compare_ether_addr(sdata->dev->dev_addr,
1873 hdr->addr1))
1874 return 0;
1875 } else if (!ieee80211_bssid_match(bssid,
1876 sdata->dev->dev_addr)) {
5cf121c3 1877 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 1878 return 0;
5cf121c3 1879 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 1880 }
23a24def 1881 break;
05c914fe 1882 case NL80211_IFTYPE_WDS:
a7767f95 1883 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 1884 return 0;
1885 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1886 return 0;
1887 break;
05c914fe 1888 case NL80211_IFTYPE_MONITOR:
fb1c1cd6
JB		 1889 /* take everything */
1890 break;
05c914fe
JB		 1891 case NL80211_IFTYPE_UNSPECIFIED:
1892 case __NL80211_IFTYPE_AFTER_LAST:
fb1c1cd6
JB		 1893 /* should never get here */
1894 WARN_ON(1);
1895 break;
23a24def
JB		 1896 }
1897
1898 return 1;
1899}
1900
571ecf67 1901/*
6368e4b1
RR		 1902 * This is the actual Rx frames handler. as it blongs to Rx path it must
1903 * be called with rcu_read_lock protection.
571ecf67 1904 */
71ebb4aa
RR		 1905static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1906 struct sk_buff *skb,
1907 struct ieee80211_rx_status *status,
8318d78a 1908 struct ieee80211_rate *rate)
571ecf67
JB		 1909{
1910 struct ieee80211_local *local = hw_to_local(hw);
1911 struct ieee80211_sub_if_data *sdata;
571ecf67 1912 struct ieee80211_hdr *hdr;
5cf121c3 1913 struct ieee80211_rx_data rx;
6368e4b1 1914 int prepares;
8e6f0032
JB		 1915 struct ieee80211_sub_if_data *prev = NULL;
1916 struct sk_buff *skb_new;
1917 u8 *bssid;
571ecf67 1918
358c8d9d 1919 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1920 memset(&rx, 0, sizeof(rx));
1921 rx.skb = skb;
1922 rx.local = local;
1923
5cf121c3 1924 rx.status = status;
5cf121c3 1925 rx.rate = rate;
72abd81b 1926
358c8d9d 1927 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 1928 local->dot11ReceivedFragmentCount++;
571ecf67 1929
8944b79f
JB		 1930 rx.sta = sta_info_get(local, hdr->addr2);
1931 if (rx.sta) {
d0709a65
JB		 1932 rx.sdata = rx.sta->sdata;
1933 rx.dev = rx.sta->sdata->dev;
b2e7771e 1934 }
571ecf67 1935
571ecf67 1936 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
8944b79f 1937 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
d0709a65 1938 return;
571ecf67
JB		 1939 }
1940
c2b13452 1941 if (unlikely(local->sw_scanning || local->hw_scanning))
5cf121c3 1942 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 1943
38f3714d
JB		 1944 ieee80211_parse_qos(&rx);
1945 ieee80211_verify_ip_alignment(&rx);
1946
571ecf67
JB		 1947 skb = rx.skb;
1948
79010420 1949 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 1950 if (!netif_running(sdata->dev))
1951 continue;
1952
05c914fe 1953 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
b2e7771e
JB		 1954 continue;
1955
51fb61e7 1956 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
5cf121c3 1957 rx.flags |= IEEE80211_RX_RA_MATCH;
6368e4b1 1958 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
23a24def 1959
6368e4b1 1960 if (!prepares)
23a24def 1961 continue;
8e6f0032 1962
340e11f3
JB		 1963 /*
1964 * frame is destined for this interface, but if it's not
1965 * also for the previous one we handle that after the
1966 * loop to avoid copying the SKB once too much
1967 */
1968
1969 if (!prev) {
1970 prev = sdata;
1971 continue;
8e6f0032 1972 }
340e11f3
JB		 1973
1974 /*
1975 * frame was destined for the previous interface
1976 * so invoke RX handlers for it
1977 */
1978
1979 skb_new = skb_copy(skb, GFP_ATOMIC);
1980 if (!skb_new) {
1981 if (net_ratelimit())
1982 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 1983 "multicast frame for %s\n",
dd1cd4c6
JB		 1984 wiphy_name(local->hw.wiphy),
1985 prev->dev->name);
340e11f3
JB		 1986 continue;
1987 }
8944b79f 1988 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 1989 prev = sdata;
571ecf67 1990 }
a4b7d7bd 1991 if (prev)
8944b79f 1992 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 1993 else
8e6f0032 1994 dev_kfree_skb(skb);
571ecf67 1995}
6368e4b1 1996
b580781e
RR		 1997#define SEQ_MODULO 0x1000
1998#define SEQ_MASK 0xfff
1999
2000static inline int seq_less(u16 sq1, u16 sq2)
2001{
2002 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
2003}
2004
2005static inline u16 seq_inc(u16 sq)
2006{
2007 return ((sq + 1) & SEQ_MASK);
2008}
2009
2010static inline u16 seq_sub(u16 sq1, u16 sq2)
2011{
2012 return ((sq1 - sq2) & SEQ_MASK);
2013}
2014
2015
71364716
RR		 2016/*
2017 * As it function blongs to Rx path it must be called with
2018 * the proper rcu_read_lock protection for its flow.
2019 */
b580781e
RR		 2020u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2021 struct tid_ampdu_rx *tid_agg_rx,
2022 struct sk_buff *skb, u16 mpdu_seq_num,
2023 int bar_req)
2024{
2025 struct ieee80211_local *local = hw_to_local(hw);
2026 struct ieee80211_rx_status status;
2027 u16 head_seq_num, buf_size;
2028 int index;
8318d78a
JB		 2029 struct ieee80211_supported_band *sband;
2030 struct ieee80211_rate *rate;
b580781e
RR		 2031
2032 buf_size = tid_agg_rx->buf_size;
2033 head_seq_num = tid_agg_rx->head_seq_num;
2034
2035 /* frame with out of date sequence number */
2036 if (seq_less(mpdu_seq_num, head_seq_num)) {
2037 dev_kfree_skb(skb);
2038 return 1;
2039 }
2040
2041 /* if frame sequence number exceeds our buffering window size or
2042 * block Ack Request arrived - release stored frames */
2043 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2044 /* new head to the ordering buffer */
2045 if (bar_req)
2046 head_seq_num = mpdu_seq_num;
2047 else
2048 head_seq_num =
2049 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2050 /* release stored frames up to new head to stack */
2051 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2052 index = seq_sub(tid_agg_rx->head_seq_num,
2053 tid_agg_rx->ssn)
2054 % tid_agg_rx->buf_size;
2055
2056 if (tid_agg_rx->reorder_buf[index]) {
2057 /* release the reordered frames to stack */
2058 memcpy(&status,
2059 tid_agg_rx->reorder_buf[index]->cb,
2060 sizeof(status));
8318d78a
JB		 2061 sband = local->hw.wiphy->bands[status.band];
2062 rate = &sband->bitrates[status.rate_idx];
b580781e
RR		 2063 __ieee80211_rx_handle_packet(hw,
2064 tid_agg_rx->reorder_buf[index],
9e72ebd6 2065 &status, rate);
b580781e
RR		 2066 tid_agg_rx->stored_mpdu_num--;
2067 tid_agg_rx->reorder_buf[index] = NULL;
2068 }
2069 tid_agg_rx->head_seq_num =
2070 seq_inc(tid_agg_rx->head_seq_num);
2071 }
2072 if (bar_req)
2073 return 1;
2074 }
2075
2076 /* now the new frame is always in the range of the reordering */
2077 /* buffer window */
2078 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2079 % tid_agg_rx->buf_size;
2080 /* check if we already stored this frame */
2081 if (tid_agg_rx->reorder_buf[index]) {
2082 dev_kfree_skb(skb);
2083 return 1;
2084 }
2085
2086 /* if arrived mpdu is in the right order and nothing else stored */
2087 /* release it immediately */
2088 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2089 tid_agg_rx->stored_mpdu_num == 0) {
2090 tid_agg_rx->head_seq_num =
2091 seq_inc(tid_agg_rx->head_seq_num);
2092 return 0;
2093 }
2094
2095 /* put the frame in the reordering buffer */
2096 tid_agg_rx->reorder_buf[index] = skb;
2097 tid_agg_rx->stored_mpdu_num++;
2098 /* release the buffer until next missing frame */
2099 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2100 % tid_agg_rx->buf_size;
2101 while (tid_agg_rx->reorder_buf[index]) {
2102 /* release the reordered frame back to stack */
2103 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2104 sizeof(status));
8318d78a
JB		 2105 sband = local->hw.wiphy->bands[status.band];
2106 rate = &sband->bitrates[status.rate_idx];
b580781e 2107 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
9e72ebd6 2108 &status, rate);
b580781e
RR		 2109 tid_agg_rx->stored_mpdu_num--;
2110 tid_agg_rx->reorder_buf[index] = NULL;
2111 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2112 index = seq_sub(tid_agg_rx->head_seq_num,
2113 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2114 }
2115 return 1;
2116}
2117
71ebb4aa
RR		 2118static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2119 struct sk_buff *skb)
b580781e
RR		 2120{
2121 struct ieee80211_hw *hw = &local->hw;
2122 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2123 struct sta_info *sta;
2124 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2125 u16 sc;
b580781e 2126 u16 mpdu_seq_num;
182503ab 2127 u8 ret = 0;
b580781e
RR		 2128 int tid;
2129
2130 sta = sta_info_get(local, hdr->addr2);
2131 if (!sta)
2132 return ret;
2133
b580781e
RR		 2134 /* filter the QoS data rx stream according to
2135 * STA/TID and check if this STA/TID is on aggregation */
87228f57 2136 if (!ieee80211_is_data_qos(hdr->frame_control))
b580781e
RR		 2137 goto end_reorder;
2138
238f74a2 2139 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2140
cee24a3e 2141 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
b580781e
RR		 2142 goto end_reorder;
2143
cee24a3e
RR		 2144 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2145
2560b6e2
EG		 2146 /* qos null data frames are excluded */
2147 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
b580781e
RR		 2148 goto end_reorder;
2149
2150 /* new un-ordered ampdu frame - process it */
2151
2152 /* reset session timer */
2153 if (tid_agg_rx->timeout) {
2154 unsigned long expires =
2155 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2156 mod_timer(&tid_agg_rx->session_timer, expires);
2157 }
2158
2159 /* if this mpdu is fragmented - terminate rx aggregation session */
2160 sc = le16_to_cpu(hdr->seq_ctrl);
2161 if (sc & IEEE80211_SCTL_FRAG) {
17741cdc 2162 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
b580781e
RR		 2163 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2164 ret = 1;
2165 goto end_reorder;
2166 }
2167
2168 /* according to mpdu sequence number deal with reordering buffer */
2169 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2170 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2171 mpdu_seq_num, 0);
d0709a65 2172 end_reorder:
b580781e
RR		 2173 return ret;
2174}
2175
6368e4b1
RR		 2176/*
2177 * This is the receive path handler. It is called by a low level driver when an
2178 * 802.11 MPDU is received from the hardware.
2179 */
2180void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2181 struct ieee80211_rx_status *status)
2182{
2183 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2184 struct ieee80211_rate *rate = NULL;
2185 struct ieee80211_supported_band *sband;
2186
2187 if (status->band < 0 ||
13d8fd2d 2188 status->band >= IEEE80211_NUM_BANDS) {
8318d78a
JB		 2189 WARN_ON(1);
2190 return;
2191 }
2192
2193 sband = local->hw.wiphy->bands[status->band];
2194
2195 if (!sband ||
2196 status->rate_idx < 0 ||
2197 status->rate_idx >= sband->n_bitrates) {
2198 WARN_ON(1);
2199 return;
2200 }
2201
2202 rate = &sband->bitrates[status->rate_idx];
6368e4b1
RR		 2203
2204 /*
2205 * key references and virtual interfaces are protected using RCU
2206 * and this requires that we are in a read-side RCU section during
2207 * receive processing
2208 */
2209 rcu_read_lock();
2210
2211 /*
2212 * Frames with failed FCS/PLCP checksum are not returned,
2213 * all other frames are returned without radiotap header
2214 * if it was previously present.
2215 * Also, frames with less than 16 bytes are dropped.
2216 */
8318d78a 2217 skb = ieee80211_rx_monitor(local, skb, status, rate);
6368e4b1
RR		 2218 if (!skb) {
2219 rcu_read_unlock();
2220 return;
2221 }
2222
b580781e 2223 if (!ieee80211_rx_reorder_ampdu(local, skb))
9e72ebd6 2224 __ieee80211_rx_handle_packet(hw, skb, status, rate);
6368e4b1
RR		 2225
2226 rcu_read_unlock();
2227}
571ecf67
JB		 2228EXPORT_SYMBOL(__ieee80211_rx);
2229
2230/* This is a version of the rx handler that can be called from hard irq
2231 * context. Post the skb on the queue and schedule the tasklet */
2232void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2233 struct ieee80211_rx_status *status)
2234{
2235 struct ieee80211_local *local = hw_to_local(hw);
2236
2237 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2238
2239 skb->dev = local->mdev;
2240 /* copy status into skb->cb for use by tasklet */
2241 memcpy(skb->cb, status, sizeof(*status));
2242 skb->pkt_type = IEEE80211_RX_MSG;
2243 skb_queue_tail(&local->skb_queue, skb);
2244 tasklet_schedule(&local->tasklet);
2245}
2246EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux kernel - Deliverables
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