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mac80211: inform driver of basic rateset
[linux-block.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
51fb61e7 298 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR)
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)) &&
51fb61e7 515 rx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
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
571ecf67
JB		 653static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
654{
655 struct ieee80211_sub_if_data *sdata;
0795af57
JP		 656 DECLARE_MAC_BUF(mac);
657
d0709a65 658 sdata = sta->sdata;
571ecf67 659
3e122be0 660 atomic_inc(&sdata->bss->num_sta_ps);
07346f81 661 set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL);
571ecf67 662#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP		 663 printk(KERN_DEBUG "%s: STA %s aid %d enters power save mode\n",
664 dev->name, print_mac(mac, sta->addr), sta->aid);
571ecf67
JB		 665#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
666}
667
668static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
669{
670 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
671 struct sk_buff *skb;
672 int sent = 0;
673 struct ieee80211_sub_if_data *sdata;
e039fa4a 674 struct ieee80211_tx_info *info;
0795af57 675 DECLARE_MAC_BUF(mac);
571ecf67 676
d0709a65 677 sdata = sta->sdata;
004c872e 678
3e122be0 679 atomic_dec(&sdata->bss->num_sta_ps);
004c872e 680
07346f81 681 clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL);
004c872e
JB		 682
683 if (!skb_queue_empty(&sta->ps_tx_buf))
684 sta_info_clear_tim_bit(sta);
685
571ecf67 686#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP		 687 printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
688 dev->name, print_mac(mac, sta->addr), sta->aid);
571ecf67 689#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
004c872e 690
571ecf67
JB		 691 /* Send all buffered frames to the station */
692 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
e039fa4a 693 info = IEEE80211_SKB_CB(skb);
571ecf67 694 sent++;
e039fa4a 695 info->flags |= IEEE80211_TX_CTL_REQUEUE;
571ecf67
JB		 696 dev_queue_xmit(skb);
697 }
698 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
e039fa4a 699 info = IEEE80211_SKB_CB(skb);
571ecf67
JB		 700 local->total_ps_buffered--;
701 sent++;
702#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57 703 printk(KERN_DEBUG "%s: STA %s aid %d send PS frame "
571ecf67 704 "since STA not sleeping anymore\n", dev->name,
0795af57 705 print_mac(mac, sta->addr), sta->aid);
571ecf67 706#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
e039fa4a 707 info->flags |= IEEE80211_TX_CTL_REQUEUE;
571ecf67
JB		 708 dev_queue_xmit(skb);
709 }
710
711 return sent;
712}
713
49461622 714static ieee80211_rx_result debug_noinline
5cf121c3 715ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
571ecf67
JB		 716{
717 struct sta_info *sta = rx->sta;
718 struct net_device *dev = rx->dev;
a7767f95 719 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
571ecf67
JB		 720
721 if (!sta)
9ae54c84 722 return RX_CONTINUE;
571ecf67
JB		 723
724 /* Update last_rx only for IBSS packets which are for the current
725 * BSSID to avoid keeping the current IBSS network alive in cases where
726 * other STAs are using different BSSID. */
51fb61e7 727 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
71364716
RR		 728 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
729 IEEE80211_IF_TYPE_IBSS);
571ecf67
JB		 730 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
731 sta->last_rx = jiffies;
732 } else
733 if (!is_multicast_ether_addr(hdr->addr1) ||
51fb61e7 734 rx->sdata->vif.type == IEEE80211_IF_TYPE_STA) {
571ecf67
JB		 735 /* Update last_rx only for unicast frames in order to prevent
736 * the Probe Request frames (the only broadcast frames from a
737 * STA in infrastructure mode) from keeping a connection alive.
33b64eb2
LCC		 738 * Mesh beacons will update last_rx when if they are found to
739 * match the current local configuration when processed.
571ecf67
JB		 740 */
741 sta->last_rx = jiffies;
742 }
743
5cf121c3 744 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
9ae54c84 745 return RX_CONTINUE;
571ecf67
JB		 746
747 sta->rx_fragments++;
748 sta->rx_bytes += rx->skb->len;
5cf121c3 749 sta->last_signal = rx->status->signal;
566bfe5a 750 sta->last_qual = rx->status->qual;
5cf121c3 751 sta->last_noise = rx->status->noise;
571ecf67 752
3e122be0
JB		 753 if (!ieee80211_has_morefrags(hdr->frame_control) &&
754 (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
755 rx->sdata->vif.type == IEEE80211_IF_TYPE_VLAN)) {
571ecf67
JB		 756 /* Change STA power saving mode only in the end of a frame
757 * exchange sequence */
07346f81 758 if (test_sta_flags(sta, WLAN_STA_PS) &&
a7767f95 759 !ieee80211_has_pm(hdr->frame_control))
5cf121c3 760 rx->sent_ps_buffered += ap_sta_ps_end(dev, sta);
07346f81 761 else if (!test_sta_flags(sta, WLAN_STA_PS) &&
a7767f95 762 ieee80211_has_pm(hdr->frame_control))
571ecf67
JB		 763 ap_sta_ps_start(dev, sta);
764 }
765
766 /* Drop data::nullfunc frames silently, since they are used only to
767 * control station power saving mode. */
a7767f95 768 if (ieee80211_is_nullfunc(hdr->frame_control)) {
571ecf67
JB		 769 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
770 /* Update counter and free packet here to avoid counting this
771 * as a dropped packed. */
772 sta->rx_packets++;
773 dev_kfree_skb(rx->skb);
9ae54c84 774 return RX_QUEUED;
571ecf67
JB		 775 }
776
9ae54c84 777 return RX_CONTINUE;
571ecf67
JB		 778} /* ieee80211_rx_h_sta_process */
779
571ecf67
JB		 780static inline struct ieee80211_fragment_entry *
781ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
782 unsigned int frag, unsigned int seq, int rx_queue,
783 struct sk_buff **skb)
784{
785 struct ieee80211_fragment_entry *entry;
786 int idx;
787
788 idx = sdata->fragment_next;
789 entry = &sdata->fragments[sdata->fragment_next++];
790 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
791 sdata->fragment_next = 0;
792
793 if (!skb_queue_empty(&entry->skb_list)) {
f4ea83dd 794#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
571ecf67
JB		 795 struct ieee80211_hdr *hdr =
796 (struct ieee80211_hdr *) entry->skb_list.next->data;
0795af57
JP		 797 DECLARE_MAC_BUF(mac);
798 DECLARE_MAC_BUF(mac2);
571ecf67
JB		 799 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
800 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
0795af57 801 "addr1=%s addr2=%s\n",
571ecf67
JB		 802 sdata->dev->name, idx,
803 jiffies - entry->first_frag_time, entry->seq,
0795af57
JP		 804 entry->last_frag, print_mac(mac, hdr->addr1),
805 print_mac(mac2, hdr->addr2));
f4ea83dd 806#endif
571ecf67
JB		 807 __skb_queue_purge(&entry->skb_list);
808 }
809
810 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
811 *skb = NULL;
812 entry->first_frag_time = jiffies;
813 entry->seq = seq;
814 entry->rx_queue = rx_queue;
815 entry->last_frag = frag;
816 entry->ccmp = 0;
817 entry->extra_len = 0;
818
819 return entry;
820}
821
822static inline struct ieee80211_fragment_entry *
823ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
b73d70ad 824 unsigned int frag, unsigned int seq,
571ecf67
JB		 825 int rx_queue, struct ieee80211_hdr *hdr)
826{
827 struct ieee80211_fragment_entry *entry;
828 int i, idx;
829
830 idx = sdata->fragment_next;
831 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
832 struct ieee80211_hdr *f_hdr;
571ecf67
JB		 833
834 idx--;
835 if (idx < 0)
836 idx = IEEE80211_FRAGMENT_MAX - 1;
837
838 entry = &sdata->fragments[idx];
839 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
840 entry->rx_queue != rx_queue ||
841 entry->last_frag + 1 != frag)
842 continue;
843
b73d70ad 844 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
571ecf67 845
b73d70ad
HH		 846 /*
847 * Check ftype and addresses are equal, else check next fragment
848 */
849 if (((hdr->frame_control ^ f_hdr->frame_control) &
850 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
571ecf67
JB		 851 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
852 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
853 continue;
854
ab46623e 855 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
571ecf67
JB		 856 __skb_queue_purge(&entry->skb_list);
857 continue;
858 }
859 return entry;
860 }
861
862 return NULL;
863}
864
49461622 865static ieee80211_rx_result debug_noinline
5cf121c3 866ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
571ecf67
JB		 867{
868 struct ieee80211_hdr *hdr;
869 u16 sc;
358c8d9d 870 __le16 fc;
571ecf67
JB		 871 unsigned int frag, seq;
872 struct ieee80211_fragment_entry *entry;
873 struct sk_buff *skb;
0795af57 874 DECLARE_MAC_BUF(mac);
571ecf67 875
b73d70ad 876 hdr = (struct ieee80211_hdr *)rx->skb->data;
358c8d9d 877 fc = hdr->frame_control;
571ecf67
JB		 878 sc = le16_to_cpu(hdr->seq_ctrl);
879 frag = sc & IEEE80211_SCTL_FRAG;
880
358c8d9d 881 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
571ecf67
JB		 882 (rx->skb)->len < 24 ||
883 is_multicast_ether_addr(hdr->addr1))) {
884 /* not fragmented */
885 goto out;
886 }
887 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
888
889 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
890
891 if (frag == 0) {
892 /* This is the first fragment of a new frame. */
893 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
5cf121c3 894 rx->queue, &(rx->skb));
8f20fc24 895 if (rx->key && rx->key->conf.alg == ALG_CCMP &&
358c8d9d 896 ieee80211_has_protected(fc)) {
571ecf67
JB		 897 /* Store CCMP PN so that we can verify that the next
898 * fragment has a sequential PN value. */
899 entry->ccmp = 1;
900 memcpy(entry->last_pn,
5cf121c3 901 rx->key->u.ccmp.rx_pn[rx->queue],
571ecf67
JB		 902 CCMP_PN_LEN);
903 }
9ae54c84 904 return RX_QUEUED;
571ecf67
JB		 905 }
906
907 /* This is a fragment for a frame that should already be pending in
908 * fragment cache. Add this fragment to the end of the pending entry.
909 */
b73d70ad 910 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr);
571ecf67
JB		 911 if (!entry) {
912 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
e4c26add 913 return RX_DROP_MONITOR;
571ecf67
JB		 914 }
915
916 /* Verify that MPDUs within one MSDU have sequential PN values.
917 * (IEEE 802.11i, 8.3.3.4.5) */
918 if (entry->ccmp) {
919 int i;
920 u8 pn[CCMP_PN_LEN], *rpn;
8f20fc24 921 if (!rx->key || rx->key->conf.alg != ALG_CCMP)
e4c26add 922 return RX_DROP_UNUSABLE;
571ecf67
JB		 923 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
924 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
925 pn[i]++;
926 if (pn[i])
927 break;
928 }
5cf121c3 929 rpn = rx->key->u.ccmp.rx_pn[rx->queue];
f4ea83dd 930 if (memcmp(pn, rpn, CCMP_PN_LEN))
e4c26add 931 return RX_DROP_UNUSABLE;
571ecf67
JB		 932 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
933 }
934
358c8d9d 935 skb_pull(rx->skb, ieee80211_hdrlen(fc));
571ecf67
JB		 936 __skb_queue_tail(&entry->skb_list, rx->skb);
937 entry->last_frag = frag;
938 entry->extra_len += rx->skb->len;
358c8d9d 939 if (ieee80211_has_morefrags(fc)) {
571ecf67 940 rx->skb = NULL;
9ae54c84 941 return RX_QUEUED;
571ecf67
JB		 942 }
943
944 rx->skb = __skb_dequeue(&entry->skb_list);
945 if (skb_tailroom(rx->skb) < entry->extra_len) {
946 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
947 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
948 GFP_ATOMIC))) {
949 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
950 __skb_queue_purge(&entry->skb_list);
e4c26add 951 return RX_DROP_UNUSABLE;
571ecf67
JB		 952 }
953 }
954 while ((skb = __skb_dequeue(&entry->skb_list))) {
955 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
956 dev_kfree_skb(skb);
957 }
958
959 /* Complete frame has been reassembled - process it now */
5cf121c3 960 rx->flags |= IEEE80211_RX_FRAGMENTED;
571ecf67
JB		 961
962 out:
963 if (rx->sta)
964 rx->sta->rx_packets++;
965 if (is_multicast_ether_addr(hdr->addr1))
966 rx->local->dot11MulticastReceivedFrameCount++;
967 else
968 ieee80211_led_rx(rx->local);
9ae54c84 969 return RX_CONTINUE;
571ecf67
JB		 970}
971
49461622 972static ieee80211_rx_result debug_noinline
5cf121c3 973ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx)
571ecf67 974{
98f0b0a3 975 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67
JB		 976 struct sk_buff *skb;
977 int no_pending_pkts;
0795af57 978 DECLARE_MAC_BUF(mac);
358c8d9d 979 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control;
571ecf67 980
358c8d9d 981 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) ||
5cf121c3 982 !(rx->flags & IEEE80211_RX_RA_MATCH)))
9ae54c84 983 return RX_CONTINUE;
571ecf67 984
51fb61e7
JB		 985 if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
986 (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
e4c26add 987 return RX_DROP_UNUSABLE;
98f0b0a3 988
571ecf67
JB		 989 skb = skb_dequeue(&rx->sta->tx_filtered);
990 if (!skb) {
991 skb = skb_dequeue(&rx->sta->ps_tx_buf);
992 if (skb)
993 rx->local->total_ps_buffered--;
994 }
995 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
996 skb_queue_empty(&rx->sta->ps_tx_buf);
997
998 if (skb) {
999 struct ieee80211_hdr *hdr =
1000 (struct ieee80211_hdr *) skb->data;
1001
4a9a66e9
JB		 1002 /*
1003 * Tell TX path to send one frame even though the STA may
1004 * still remain is PS mode after this frame exchange.
1005 */
07346f81 1006 set_sta_flags(rx->sta, WLAN_STA_PSPOLL);
571ecf67
JB		 1007
1008#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0795af57
JP		 1009 printk(KERN_DEBUG "STA %s aid %d: PS Poll (entries after %d)\n",
1010 print_mac(mac, rx->sta->addr), rx->sta->aid,
571ecf67
JB		 1011 skb_queue_len(&rx->sta->ps_tx_buf));
1012#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1013
1014 /* Use MoreData flag to indicate whether there are more
1015 * buffered frames for this STA */
836341a7 1016 if (no_pending_pkts)
571ecf67 1017 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
836341a7 1018 else
571ecf67
JB		 1019 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1020
1021 dev_queue_xmit(skb);
1022
004c872e
JB		 1023 if (no_pending_pkts)
1024 sta_info_clear_tim_bit(rx->sta);
571ecf67 1025#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
5cf121c3 1026 } else if (!rx->sent_ps_buffered) {
004c872e
JB		 1027 /*
1028 * FIXME: This can be the result of a race condition between
1029 * us expiring a frame and the station polling for it.
1030 * Should we send it a null-func frame indicating we
1031 * have nothing buffered for it?
1032 */
0795af57 1033 printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
f4ea83dd 1034 "though there are no buffered frames for it\n",
0795af57 1035 rx->dev->name, print_mac(mac, rx->sta->addr));
571ecf67 1036#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
571ecf67
JB		 1037 }
1038
9ae54c84 1039 /* Free PS Poll skb here instead of returning RX_DROP that would
571ecf67
JB		 1040 * count as an dropped frame. */
1041 dev_kfree_skb(rx->skb);
1042
9ae54c84 1043 return RX_QUEUED;
571ecf67
JB		 1044}
1045
49461622 1046static ieee80211_rx_result debug_noinline
5cf121c3 1047ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx)
6e0d114d 1048{
6e0d114d 1049 u8 *data = rx->skb->data;
238f74a2 1050 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
6e0d114d 1051
238f74a2 1052 if (!ieee80211_is_data_qos(hdr->frame_control))
9ae54c84 1053 return RX_CONTINUE;
6e0d114d
JB		 1054
1055 /* remove the qos control field, update frame type and meta-data */
238f74a2
HH		 1056 memmove(data + IEEE80211_QOS_CTL_LEN, data,
1057 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN);
1058 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN);
6e0d114d 1059 /* change frame type to non QOS */
238f74a2 1060 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
6e0d114d 1061
9ae54c84 1062 return RX_CONTINUE;
6e0d114d
JB		 1063}
1064
76ee65bf 1065static int
5cf121c3 1066ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
571ecf67 1067{
07346f81 1068 if (unlikely(!rx->sta ||
f4ea83dd 1069 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED)))
76ee65bf 1070 return -EACCES;
571ecf67 1071
76ee65bf 1072 return 0;
571ecf67
JB		 1073}
1074
76ee65bf 1075static int
358c8d9d 1076ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
571ecf67 1077{
3017b80b 1078 /*
7848ba7d
JB		 1079 * Pass through unencrypted frames if the hardware has
1080 * decrypted them already.
3017b80b 1081 */
5cf121c3 1082 if (rx->status->flag & RX_FLAG_DECRYPTED)
76ee65bf 1083 return 0;
571ecf67
JB		 1084
1085 /* Drop unencrypted frames if key is set. */
358c8d9d
HH		 1086 if (unlikely(!ieee80211_has_protected(fc) &&
1087 !ieee80211_is_nullfunc(fc) &&
b3fc9c6c 1088 (rx->key || rx->sdata->drop_unencrypted)))
76ee65bf 1089 return -EACCES;
b3fc9c6c 1090
76ee65bf 1091 return 0;
571ecf67
JB		 1092}
1093
76ee65bf 1094static int
5cf121c3 1095ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
571ecf67
JB		 1096{
1097 struct net_device *dev = rx->dev;
571ecf67 1098 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
b73d70ad 1099 u16 hdrlen, ethertype;
571ecf67
JB		 1100 u8 *payload;
1101 u8 dst[ETH_ALEN];
c97c23e3 1102 u8 src[ETH_ALEN] __aligned(2);
76ee65bf 1103 struct sk_buff *skb = rx->skb;
571ecf67 1104 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
0795af57
JP		 1105 DECLARE_MAC_BUF(mac);
1106 DECLARE_MAC_BUF(mac2);
1107 DECLARE_MAC_BUF(mac3);
1108 DECLARE_MAC_BUF(mac4);
571ecf67 1109
b73d70ad 1110 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
76ee65bf 1111 return -1;
571ecf67 1112
b73d70ad 1113 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67 1114
e32f85f7
LCC		 1115 if (ieee80211_vif_is_mesh(&sdata->vif))
1116 hdrlen += ieee80211_get_mesh_hdrlen(
33b64eb2 1117 (struct ieee80211s_hdr *) (skb->data + hdrlen));
33b64eb2 1118
571ecf67
JB		 1119 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
1120 * header
1121 * IEEE 802.11 address fields:
1122 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
1123 * 0 0 DA SA BSSID n/a
1124 * 0 1 DA BSSID SA n/a
1125 * 1 0 BSSID SA DA n/a
1126 * 1 1 RA TA DA SA
1127 */
b73d70ad
HH		 1128 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
1129 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
571ecf67 1130
b73d70ad
HH		 1131 switch (hdr->frame_control &
1132 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
1133 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS):
51fb61e7 1134 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_AP &&
f4ea83dd 1135 sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
76ee65bf 1136 return -1;
571ecf67 1137 break;
b73d70ad
HH		 1138 case __constant_cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
1139 if (unlikely(sdata->vif.type != IEEE80211_IF_TYPE_WDS &&
f4ea83dd 1140 sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
76ee65bf 1141 return -1;
571ecf67 1142 break;
b73d70ad 1143 case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
51fb61e7 1144 if (sdata->vif.type != IEEE80211_IF_TYPE_STA ||
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):
f4ea83dd 1150 if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
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
213cd118
JB		 1224 if ((sdata->vif.type == IEEE80211_IF_TYPE_AP ||
1225 sdata->vif.type == IEEE80211_IF_TYPE_VLAN) &&
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
e32f85f7
LCC		 1382static ieee80211_rx_result debug_noinline
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
1401 if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0)
1402 return RX_CONTINUE;
1403
1404 mesh_hdr->ttl--;
1405
1406 if (rx->flags & IEEE80211_RX_RA_MATCH) {
1407 if (!mesh_hdr->ttl)
472dbc45 1408 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh,
e32f85f7
LCC		 1409 dropped_frames_ttl);
1410 else {
1411 struct ieee80211_hdr *fwd_hdr;
1412 fwd_skb = skb_copy(skb, GFP_ATOMIC);
1413
1414 if (!fwd_skb && net_ratelimit())
1415 printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
1416 rx->dev->name);
1417
1418 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
1419 /*
1420 * Save TA to addr1 to send TA a path error if a
1421 * suitable next hop is not found
1422 */
1423 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN);
1424 memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN);
1425 fwd_skb->dev = rx->local->mdev;
1426 fwd_skb->iif = rx->dev->ifindex;
1427 dev_queue_xmit(fwd_skb);
1428 }
1429 }
1430
1431 if (is_multicast_ether_addr(hdr->addr3) ||
1432 rx->dev->flags & IFF_PROMISC)
1433 return RX_CONTINUE;
1434 else
1435 return RX_DROP_MONITOR;
1436}
1437
1438
49461622 1439static ieee80211_rx_result debug_noinline
5cf121c3 1440ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
76ee65bf
RR		 1441{
1442 struct net_device *dev = rx->dev;
358c8d9d
HH		 1443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1444 __le16 fc = hdr->frame_control;
ce3edf6d 1445 int err;
76ee65bf 1446
358c8d9d 1447 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
9ae54c84 1448 return RX_CONTINUE;
76ee65bf 1449
358c8d9d 1450 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
e4c26add 1451 return RX_DROP_MONITOR;
76ee65bf 1452
76ee65bf
RR		 1453 err = ieee80211_data_to_8023(rx);
1454 if (unlikely(err))
e4c26add 1455 return RX_DROP_UNUSABLE;
76ee65bf 1456
358c8d9d 1457 if (!ieee80211_frame_allowed(rx, fc))
e4c26add 1458 return RX_DROP_MONITOR;
ce3edf6d 1459
76ee65bf
RR		 1460 rx->skb->dev = dev;
1461
1462 dev->stats.rx_packets++;
1463 dev->stats.rx_bytes += rx->skb->len;
1464
1465 ieee80211_deliver_skb(rx);
571ecf67 1466
9ae54c84 1467 return RX_QUEUED;
571ecf67
JB		 1468}
1469
49461622 1470static ieee80211_rx_result debug_noinline
5cf121c3 1471ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
71364716
RR		 1472{
1473 struct ieee80211_local *local = rx->local;
1474 struct ieee80211_hw *hw = &local->hw;
1475 struct sk_buff *skb = rx->skb;
a7767f95 1476 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
71364716
RR		 1477 struct tid_ampdu_rx *tid_agg_rx;
1478 u16 start_seq_num;
1479 u16 tid;
1480
a7767f95 1481 if (likely(!ieee80211_is_ctl(bar->frame_control)))
9ae54c84 1482 return RX_CONTINUE;
71364716 1483
a7767f95 1484 if (ieee80211_is_back_req(bar->frame_control)) {
71364716 1485 if (!rx->sta)
9ae54c84 1486 return RX_CONTINUE;
71364716 1487 tid = le16_to_cpu(bar->control) >> 12;
cee24a3e
RR		 1488 if (rx->sta->ampdu_mlme.tid_state_rx[tid]
1489 != HT_AGG_STATE_OPERATIONAL)
9ae54c84 1490 return RX_CONTINUE;
cee24a3e 1491 tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
71364716
RR		 1492
1493 start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
1494
1495 /* reset session timer */
1496 if (tid_agg_rx->timeout) {
1497 unsigned long expires =
1498 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
1499 mod_timer(&tid_agg_rx->session_timer, expires);
1500 }
1501
1502 /* manage reordering buffer according to requested */
1503 /* sequence number */
1504 rcu_read_lock();
1505 ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
1506 start_seq_num, 1);
1507 rcu_read_unlock();
e4c26add 1508 return RX_DROP_UNUSABLE;
71364716
RR		 1509 }
1510
9ae54c84 1511 return RX_CONTINUE;
71364716
RR		 1512}
1513
de1ede7a
JB		 1514static ieee80211_rx_result debug_noinline
1515ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
1516{
1517 struct ieee80211_local *local = rx->local;
1518 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
1519 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
1520 int len = rx->skb->len;
1521
1522 if (!ieee80211_is_action(mgmt->frame_control))
1523 return RX_CONTINUE;
1524
1525 if (!rx->sta)
1526 return RX_DROP_MONITOR;
1527
1528 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
1529 return RX_DROP_MONITOR;
1530
1531 /* all categories we currently handle have action_code */
1532 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
1533 return RX_DROP_MONITOR;
1534
1535 /*
1536 * FIXME: revisit this, I'm sure we should handle most
1537 * of these frames in other modes as well!
1538 */
1539 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
1540 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1541 return RX_DROP_MONITOR;
1542
1543 switch (mgmt->u.action.category) {
1544 case WLAN_CATEGORY_BACK:
1545 switch (mgmt->u.action.u.addba_req.action_code) {
1546 case WLAN_ACTION_ADDBA_REQ:
1547 if (len < (IEEE80211_MIN_ACTION_SIZE +
1548 sizeof(mgmt->u.action.u.addba_req)))
1549 return RX_DROP_MONITOR;
1550 ieee80211_process_addba_request(local, rx->sta, mgmt, len);
1551 break;
1552 case WLAN_ACTION_ADDBA_RESP:
1553 if (len < (IEEE80211_MIN_ACTION_SIZE +
1554 sizeof(mgmt->u.action.u.addba_resp)))
1555 return RX_DROP_MONITOR;
1556 ieee80211_process_addba_resp(local, rx->sta, mgmt, len);
1557 break;
1558 case WLAN_ACTION_DELBA:
1559 if (len < (IEEE80211_MIN_ACTION_SIZE +
1560 sizeof(mgmt->u.action.u.delba)))
1561 return RX_DROP_MONITOR;
1562 ieee80211_process_delba(sdata, rx->sta, mgmt, len);
1563 break;
1564 }
39192c0b
JB		 1565 break;
1566 case WLAN_CATEGORY_SPECTRUM_MGMT:
1567 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
1568 return RX_DROP_MONITOR;
1569 switch (mgmt->u.action.u.measurement.action_code) {
1570 case WLAN_ACTION_SPCT_MSR_REQ:
1571 if (len < (IEEE80211_MIN_ACTION_SIZE +
1572 sizeof(mgmt->u.action.u.measurement)))
1573 return RX_DROP_MONITOR;
1574 ieee80211_process_measurement_req(sdata, mgmt, len);
1575 break;
1576 }
1577 break;
1578 default:
1579 return RX_CONTINUE;
de1ede7a
JB		 1580 }
1581
39192c0b
JB		 1582 rx->sta->rx_packets++;
1583 dev_kfree_skb(rx->skb);
1584 return RX_QUEUED;
de1ede7a
JB		 1585}
1586
49461622 1587static ieee80211_rx_result debug_noinline
5cf121c3 1588ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
571ecf67 1589{
759ef3eb 1590 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
571ecf67 1591
5cf121c3 1592 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add 1593 return RX_DROP_MONITOR;
571ecf67 1594
472dbc45
JB		 1595 if (ieee80211_vif_is_mesh(&sdata->vif))
1596 return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status);
1597
759ef3eb 1598 if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
472dbc45 1599 sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
759ef3eb
JB		 1600 return RX_DROP_MONITOR;
1601
1602 if (sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)
e4c26add 1603 return RX_DROP_MONITOR;
f9d540ee 1604
759ef3eb 1605 ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status);
9ae54c84 1606 return RX_QUEUED;
571ecf67
JB		 1607}
1608
571ecf67
JB		 1609static void ieee80211_rx_michael_mic_report(struct net_device *dev,
1610 struct ieee80211_hdr *hdr,
5cf121c3 1611 struct ieee80211_rx_data *rx)
571ecf67 1612{
a7767f95
HH		 1613 int keyidx;
1614 unsigned int hdrlen;
0795af57
JP		 1615 DECLARE_MAC_BUF(mac);
1616 DECLARE_MAC_BUF(mac2);
571ecf67 1617
a7767f95 1618 hdrlen = ieee80211_hdrlen(hdr->frame_control);
571ecf67
JB		 1619 if (rx->skb->len >= hdrlen + 4)
1620 keyidx = rx->skb->data[hdrlen + 3] >> 6;
1621 else
1622 keyidx = -1;
1623
8944b79f 1624 if (!rx->sta) {
aa0daf0e
JB		 1625 /*
1626 * Some hardware seem to generate incorrect Michael MIC
1627 * reports; ignore them to avoid triggering countermeasures.
1628 */
571ecf67
JB		 1629 goto ignore;
1630 }
1631
a7767f95 1632 if (!ieee80211_has_protected(hdr->frame_control))
571ecf67 1633 goto ignore;
571ecf67 1634
51fb61e7 1635 if (rx->sdata->vif.type == IEEE80211_IF_TYPE_AP && keyidx) {
aa0daf0e
JB		 1636 /*
1637 * APs with pairwise keys should never receive Michael MIC
1638 * errors for non-zero keyidx because these are reserved for
1639 * group keys and only the AP is sending real multicast
1640 * frames in the BSS.
1641 */
eb063c17 1642 goto ignore;
571ecf67
JB		 1643 }
1644
a7767f95
HH		 1645 if (!ieee80211_is_data(hdr->frame_control) &&
1646 !ieee80211_is_auth(hdr->frame_control))
571ecf67 1647 goto ignore;
571ecf67 1648
f698d856 1649 mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr);
571ecf67
JB		 1650 ignore:
1651 dev_kfree_skb(rx->skb);
1652 rx->skb = NULL;
1653}
1654
5cf121c3
JB		 1655/* TODO: use IEEE80211_RX_FRAGMENTED */
1656static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx)
3d30d949
MW		 1657{
1658 struct ieee80211_sub_if_data *sdata;
1659 struct ieee80211_local *local = rx->local;
1660 struct ieee80211_rtap_hdr {
1661 struct ieee80211_radiotap_header hdr;
1662 u8 flags;
1663 u8 rate;
1664 __le16 chan_freq;
1665 __le16 chan_flags;
1666 } __attribute__ ((packed)) *rthdr;
1667 struct sk_buff *skb = rx->skb, *skb2;
1668 struct net_device *prev_dev = NULL;
5cf121c3 1669 struct ieee80211_rx_status *status = rx->status;
3d30d949 1670
5cf121c3 1671 if (rx->flags & IEEE80211_RX_CMNTR_REPORTED)
3d30d949
MW		 1672 goto out_free_skb;
1673
1674 if (skb_headroom(skb) < sizeof(*rthdr) &&
1675 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC))
1676 goto out_free_skb;
1677
1678 rthdr = (void *)skb_push(skb, sizeof(*rthdr));
1679 memset(rthdr, 0, sizeof(*rthdr));
1680 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1681 rthdr->hdr.it_present =
1682 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
1683 (1 << IEEE80211_RADIOTAP_RATE) |
1684 (1 << IEEE80211_RADIOTAP_CHANNEL));
1685
5cf121c3 1686 rthdr->rate = rx->rate->bitrate / 5;
3d30d949
MW		 1687 rthdr->chan_freq = cpu_to_le16(status->freq);
1688
1689 if (status->band == IEEE80211_BAND_5GHZ)
1690 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM |
1691 IEEE80211_CHAN_5GHZ);
1692 else
1693 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN |
1694 IEEE80211_CHAN_2GHZ);
1695
1696 skb_set_mac_header(skb, 0);
1697 skb->ip_summed = CHECKSUM_UNNECESSARY;
1698 skb->pkt_type = PACKET_OTHERHOST;
1699 skb->protocol = htons(ETH_P_802_2);
1700
1701 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1702 if (!netif_running(sdata->dev))
1703 continue;
1704
1705 if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR ||
1706 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
1707 continue;
1708
1709 if (prev_dev) {
1710 skb2 = skb_clone(skb, GFP_ATOMIC);
1711 if (skb2) {
1712 skb2->dev = prev_dev;
1713 netif_rx(skb2);
1714 }
1715 }
1716
1717 prev_dev = sdata->dev;
1718 sdata->dev->stats.rx_packets++;
1719 sdata->dev->stats.rx_bytes += skb->len;
1720 }
1721
1722 if (prev_dev) {
1723 skb->dev = prev_dev;
1724 netif_rx(skb);
1725 skb = NULL;
1726 } else
1727 goto out_free_skb;
1728
5cf121c3 1729 rx->flags |= IEEE80211_RX_CMNTR_REPORTED;
3d30d949
MW		 1730 return;
1731
1732 out_free_skb:
1733 dev_kfree_skb(skb);
1734}
1735
571ecf67 1736
8944b79f 1737static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1738 struct ieee80211_rx_data *rx,
8944b79f 1739 struct sk_buff *skb)
58905290 1740{
58905290
JB		 1741 ieee80211_rx_result res = RX_DROP_MONITOR;
1742
8944b79f
JB		 1743 rx->skb = skb;
1744 rx->sdata = sdata;
1745 rx->dev = sdata->dev;
1746
e32f85f7
LCC		 1747#define CALL_RXH(rxh) \
1748 do { \
1749 res = rxh(rx); \
1750 if (res != RX_CONTINUE) \
1751 goto rxh_done; \
1752 } while (0);
49461622
JB		 1753
1754 CALL_RXH(ieee80211_rx_h_passive_scan)
1755 CALL_RXH(ieee80211_rx_h_check)
1756 CALL_RXH(ieee80211_rx_h_decrypt)
1757 CALL_RXH(ieee80211_rx_h_sta_process)
1758 CALL_RXH(ieee80211_rx_h_defragment)
1759 CALL_RXH(ieee80211_rx_h_ps_poll)
1760 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
1761 /* must be after MMIC verify so header is counted in MPDU mic */
1762 CALL_RXH(ieee80211_rx_h_remove_qos_control)
1763 CALL_RXH(ieee80211_rx_h_amsdu)
e32f85f7
LCC		 1764 if (ieee80211_vif_is_mesh(&sdata->vif))
1765 CALL_RXH(ieee80211_rx_h_mesh_fwding);
49461622
JB		 1766 CALL_RXH(ieee80211_rx_h_data)
1767 CALL_RXH(ieee80211_rx_h_ctrl)
de1ede7a 1768 CALL_RXH(ieee80211_rx_h_action)
49461622
JB		 1769 CALL_RXH(ieee80211_rx_h_mgmt)
1770
1771#undef CALL_RXH
1772
1773 rxh_done:
58905290
JB		 1774 switch (res) {
1775 case RX_DROP_MONITOR:
49461622
JB		 1776 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1777 if (rx->sta)
1778 rx->sta->rx_dropped++;
1779 /* fall through */
1780 case RX_CONTINUE:
3d30d949
MW		 1781 ieee80211_rx_cooked_monitor(rx);
1782 break;
58905290 1783 case RX_DROP_UNUSABLE:
49461622
JB		 1784 I802_DEBUG_INC(sdata->local->rx_handlers_drop);
1785 if (rx->sta)
1786 rx->sta->rx_dropped++;
58905290
JB		 1787 dev_kfree_skb(rx->skb);
1788 break;
49461622
JB		 1789 case RX_QUEUED:
1790 I802_DEBUG_INC(sdata->local->rx_handlers_queued);
1791 break;
58905290
JB		 1792 }
1793}
1794
571ecf67
JB		 1795/* main receive path */
1796
23a24def 1797static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata,
5cf121c3 1798 u8 *bssid, struct ieee80211_rx_data *rx,
23a24def
JB		 1799 struct ieee80211_hdr *hdr)
1800{
1801 int multicast = is_multicast_ether_addr(hdr->addr1);
1802
51fb61e7 1803 switch (sdata->vif.type) {
23a24def
JB		 1804 case IEEE80211_IF_TYPE_STA:
1805 if (!bssid)
1806 return 0;
1807 if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
5cf121c3 1808 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 1809 return 0;
5cf121c3 1810 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1811 } else if (!multicast &&
1812 compare_ether_addr(sdata->dev->dev_addr,
1813 hdr->addr1) != 0) {
4150c572 1814 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1815 return 0;
5cf121c3 1816 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1817 }
1818 break;
1819 case IEEE80211_IF_TYPE_IBSS:
1820 if (!bssid)
1821 return 0;
a7767f95 1822 if (ieee80211_is_beacon(hdr->frame_control)) {
9d9bf77d 1823 return 1;
87291c02 1824 }
9d9bf77d 1825 else if (!ieee80211_bssid_match(bssid, sdata->u.sta.bssid)) {
5cf121c3 1826 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 1827 return 0;
5cf121c3 1828 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def
JB		 1829 } else if (!multicast &&
1830 compare_ether_addr(sdata->dev->dev_addr,
1831 hdr->addr1) != 0) {
4150c572 1832 if (!(sdata->dev->flags & IFF_PROMISC))
23a24def 1833 return 0;
5cf121c3 1834 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 1835 } else if (!rx->sta)
f698d856 1836 rx->sta = ieee80211_ibss_add_sta(sdata, rx->skb,
87291c02
VK		 1837 bssid, hdr->addr2,
1838 BIT(rx->status->rate_idx));
23a24def 1839 break;
6032f934
JB		 1840 case IEEE80211_IF_TYPE_MESH_POINT:
1841 if (!multicast &&
1842 compare_ether_addr(sdata->dev->dev_addr,
1843 hdr->addr1) != 0) {
1844 if (!(sdata->dev->flags & IFF_PROMISC))
1845 return 0;
1846
5cf121c3 1847 rx->flags &= ~IEEE80211_RX_RA_MATCH;
6032f934
JB		 1848 }
1849 break;
fb1c1cd6 1850 case IEEE80211_IF_TYPE_VLAN:
23a24def
JB		 1851 case IEEE80211_IF_TYPE_AP:
1852 if (!bssid) {
1853 if (compare_ether_addr(sdata->dev->dev_addr,
1854 hdr->addr1))
1855 return 0;
1856 } else if (!ieee80211_bssid_match(bssid,
1857 sdata->dev->dev_addr)) {
5cf121c3 1858 if (!(rx->flags & IEEE80211_RX_IN_SCAN))
23a24def 1859 return 0;
5cf121c3 1860 rx->flags &= ~IEEE80211_RX_RA_MATCH;
23a24def 1861 }
23a24def
JB		 1862 break;
1863 case IEEE80211_IF_TYPE_WDS:
a7767f95 1864 if (bssid || !ieee80211_is_data(hdr->frame_control))
23a24def
JB		 1865 return 0;
1866 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2))
1867 return 0;
1868 break;
fb1c1cd6
JB		 1869 case IEEE80211_IF_TYPE_MNTR:
1870 /* take everything */
1871 break;
a2897552 1872 case IEEE80211_IF_TYPE_INVALID:
fb1c1cd6
JB		 1873 /* should never get here */
1874 WARN_ON(1);
1875 break;
23a24def
JB		 1876 }
1877
1878 return 1;
1879}
1880
571ecf67 1881/*
6368e4b1
RR		 1882 * This is the actual Rx frames handler. as it blongs to Rx path it must
1883 * be called with rcu_read_lock protection.
571ecf67 1884 */
71ebb4aa
RR		 1885static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
1886 struct sk_buff *skb,
1887 struct ieee80211_rx_status *status,
8318d78a 1888 struct ieee80211_rate *rate)
571ecf67
JB		 1889{
1890 struct ieee80211_local *local = hw_to_local(hw);
1891 struct ieee80211_sub_if_data *sdata;
571ecf67 1892 struct ieee80211_hdr *hdr;
5cf121c3 1893 struct ieee80211_rx_data rx;
6368e4b1 1894 int prepares;
8e6f0032
JB		 1895 struct ieee80211_sub_if_data *prev = NULL;
1896 struct sk_buff *skb_new;
1897 u8 *bssid;
571ecf67 1898
358c8d9d 1899 hdr = (struct ieee80211_hdr *)skb->data;
571ecf67
JB		 1900 memset(&rx, 0, sizeof(rx));
1901 rx.skb = skb;
1902 rx.local = local;
1903
5cf121c3 1904 rx.status = status;
5cf121c3 1905 rx.rate = rate;
72abd81b 1906
358c8d9d 1907 if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control))
571ecf67 1908 local->dot11ReceivedFragmentCount++;
571ecf67 1909
8944b79f
JB		 1910 rx.sta = sta_info_get(local, hdr->addr2);
1911 if (rx.sta) {
d0709a65
JB		 1912 rx.sdata = rx.sta->sdata;
1913 rx.dev = rx.sta->sdata->dev;
b2e7771e 1914 }
571ecf67 1915
571ecf67 1916 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
8944b79f 1917 ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx);
d0709a65 1918 return;
571ecf67
JB		 1919 }
1920
c2b13452 1921 if (unlikely(local->sw_scanning || local->hw_scanning))
5cf121c3 1922 rx.flags |= IEEE80211_RX_IN_SCAN;
571ecf67 1923
38f3714d
JB		 1924 ieee80211_parse_qos(&rx);
1925 ieee80211_verify_ip_alignment(&rx);
1926
571ecf67
JB		 1927 skb = rx.skb;
1928
79010420 1929 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2a8a9a88
JB		 1930 if (!netif_running(sdata->dev))
1931 continue;
1932
51fb61e7 1933 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR)
b2e7771e
JB		 1934 continue;
1935
51fb61e7 1936 bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
5cf121c3 1937 rx.flags |= IEEE80211_RX_RA_MATCH;
6368e4b1 1938 prepares = prepare_for_handlers(sdata, bssid, &rx, hdr);
23a24def 1939
6368e4b1 1940 if (!prepares)
23a24def 1941 continue;
8e6f0032 1942
340e11f3
JB		 1943 /*
1944 * frame is destined for this interface, but if it's not
1945 * also for the previous one we handle that after the
1946 * loop to avoid copying the SKB once too much
1947 */
1948
1949 if (!prev) {
1950 prev = sdata;
1951 continue;
8e6f0032 1952 }
340e11f3
JB		 1953
1954 /*
1955 * frame was destined for the previous interface
1956 * so invoke RX handlers for it
1957 */
1958
1959 skb_new = skb_copy(skb, GFP_ATOMIC);
1960 if (!skb_new) {
1961 if (net_ratelimit())
1962 printk(KERN_DEBUG "%s: failed to copy "
a4278e18 1963 "multicast frame for %s\n",
dd1cd4c6
JB		 1964 wiphy_name(local->hw.wiphy),
1965 prev->dev->name);
340e11f3
JB		 1966 continue;
1967 }
8944b79f 1968 ieee80211_invoke_rx_handlers(prev, &rx, skb_new);
8e6f0032 1969 prev = sdata;
571ecf67 1970 }
a4b7d7bd 1971 if (prev)
8944b79f 1972 ieee80211_invoke_rx_handlers(prev, &rx, skb);
a4b7d7bd 1973 else
8e6f0032 1974 dev_kfree_skb(skb);
571ecf67 1975}
6368e4b1 1976
b580781e
RR		 1977#define SEQ_MODULO 0x1000
1978#define SEQ_MASK 0xfff
1979
1980static inline int seq_less(u16 sq1, u16 sq2)
1981{
1982 return (((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1));
1983}
1984
1985static inline u16 seq_inc(u16 sq)
1986{
1987 return ((sq + 1) & SEQ_MASK);
1988}
1989
1990static inline u16 seq_sub(u16 sq1, u16 sq2)
1991{
1992 return ((sq1 - sq2) & SEQ_MASK);
1993}
1994
1995
71364716
RR		 1996/*
1997 * As it function blongs to Rx path it must be called with
1998 * the proper rcu_read_lock protection for its flow.
1999 */
b580781e
RR		 2000u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw,
2001 struct tid_ampdu_rx *tid_agg_rx,
2002 struct sk_buff *skb, u16 mpdu_seq_num,
2003 int bar_req)
2004{
2005 struct ieee80211_local *local = hw_to_local(hw);
2006 struct ieee80211_rx_status status;
2007 u16 head_seq_num, buf_size;
2008 int index;
8318d78a
JB		 2009 struct ieee80211_supported_band *sband;
2010 struct ieee80211_rate *rate;
b580781e
RR		 2011
2012 buf_size = tid_agg_rx->buf_size;
2013 head_seq_num = tid_agg_rx->head_seq_num;
2014
2015 /* frame with out of date sequence number */
2016 if (seq_less(mpdu_seq_num, head_seq_num)) {
2017 dev_kfree_skb(skb);
2018 return 1;
2019 }
2020
2021 /* if frame sequence number exceeds our buffering window size or
2022 * block Ack Request arrived - release stored frames */
2023 if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) {
2024 /* new head to the ordering buffer */
2025 if (bar_req)
2026 head_seq_num = mpdu_seq_num;
2027 else
2028 head_seq_num =
2029 seq_inc(seq_sub(mpdu_seq_num, buf_size));
2030 /* release stored frames up to new head to stack */
2031 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) {
2032 index = seq_sub(tid_agg_rx->head_seq_num,
2033 tid_agg_rx->ssn)
2034 % tid_agg_rx->buf_size;
2035
2036 if (tid_agg_rx->reorder_buf[index]) {
2037 /* release the reordered frames to stack */
2038 memcpy(&status,
2039 tid_agg_rx->reorder_buf[index]->cb,
2040 sizeof(status));
8318d78a
JB		 2041 sband = local->hw.wiphy->bands[status.band];
2042 rate = &sband->bitrates[status.rate_idx];
b580781e
RR		 2043 __ieee80211_rx_handle_packet(hw,
2044 tid_agg_rx->reorder_buf[index],
9e72ebd6 2045 &status, rate);
b580781e
RR		 2046 tid_agg_rx->stored_mpdu_num--;
2047 tid_agg_rx->reorder_buf[index] = NULL;
2048 }
2049 tid_agg_rx->head_seq_num =
2050 seq_inc(tid_agg_rx->head_seq_num);
2051 }
2052 if (bar_req)
2053 return 1;
2054 }
2055
2056 /* now the new frame is always in the range of the reordering */
2057 /* buffer window */
2058 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn)
2059 % tid_agg_rx->buf_size;
2060 /* check if we already stored this frame */
2061 if (tid_agg_rx->reorder_buf[index]) {
2062 dev_kfree_skb(skb);
2063 return 1;
2064 }
2065
2066 /* if arrived mpdu is in the right order and nothing else stored */
2067 /* release it immediately */
2068 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
2069 tid_agg_rx->stored_mpdu_num == 0) {
2070 tid_agg_rx->head_seq_num =
2071 seq_inc(tid_agg_rx->head_seq_num);
2072 return 0;
2073 }
2074
2075 /* put the frame in the reordering buffer */
2076 tid_agg_rx->reorder_buf[index] = skb;
2077 tid_agg_rx->stored_mpdu_num++;
2078 /* release the buffer until next missing frame */
2079 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn)
2080 % tid_agg_rx->buf_size;
2081 while (tid_agg_rx->reorder_buf[index]) {
2082 /* release the reordered frame back to stack */
2083 memcpy(&status, tid_agg_rx->reorder_buf[index]->cb,
2084 sizeof(status));
8318d78a
JB		 2085 sband = local->hw.wiphy->bands[status.band];
2086 rate = &sband->bitrates[status.rate_idx];
b580781e 2087 __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index],
9e72ebd6 2088 &status, rate);
b580781e
RR		 2089 tid_agg_rx->stored_mpdu_num--;
2090 tid_agg_rx->reorder_buf[index] = NULL;
2091 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num);
2092 index = seq_sub(tid_agg_rx->head_seq_num,
2093 tid_agg_rx->ssn) % tid_agg_rx->buf_size;
2094 }
2095 return 1;
2096}
2097
71ebb4aa
RR		 2098static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local,
2099 struct sk_buff *skb)
b580781e
RR		 2100{
2101 struct ieee80211_hw *hw = &local->hw;
2102 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2103 struct sta_info *sta;
2104 struct tid_ampdu_rx *tid_agg_rx;
87228f57 2105 u16 sc;
b580781e 2106 u16 mpdu_seq_num;
182503ab 2107 u8 ret = 0;
b580781e
RR		 2108 int tid;
2109
2110 sta = sta_info_get(local, hdr->addr2);
2111 if (!sta)
2112 return ret;
2113
b580781e
RR		 2114 /* filter the QoS data rx stream according to
2115 * STA/TID and check if this STA/TID is on aggregation */
87228f57 2116 if (!ieee80211_is_data_qos(hdr->frame_control))
b580781e
RR		 2117 goto end_reorder;
2118
238f74a2 2119 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
b580781e 2120
cee24a3e 2121 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL)
b580781e
RR		 2122 goto end_reorder;
2123
cee24a3e
RR		 2124 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
2125
2560b6e2
EG		 2126 /* qos null data frames are excluded */
2127 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
b580781e
RR		 2128 goto end_reorder;
2129
2130 /* new un-ordered ampdu frame - process it */
2131
2132 /* reset session timer */
2133 if (tid_agg_rx->timeout) {
2134 unsigned long expires =
2135 jiffies + (tid_agg_rx->timeout / 1000) * HZ;
2136 mod_timer(&tid_agg_rx->session_timer, expires);
2137 }
2138
2139 /* if this mpdu is fragmented - terminate rx aggregation session */
2140 sc = le16_to_cpu(hdr->seq_ctrl);
2141 if (sc & IEEE80211_SCTL_FRAG) {
f698d856 2142 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
b580781e
RR		 2143 tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP);
2144 ret = 1;
2145 goto end_reorder;
2146 }
2147
2148 /* according to mpdu sequence number deal with reordering buffer */
2149 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
2150 ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb,
2151 mpdu_seq_num, 0);
d0709a65 2152 end_reorder:
b580781e
RR		 2153 return ret;
2154}
2155
6368e4b1
RR		 2156/*
2157 * This is the receive path handler. It is called by a low level driver when an
2158 * 802.11 MPDU is received from the hardware.
2159 */
2160void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
2161 struct ieee80211_rx_status *status)
2162{
2163 struct ieee80211_local *local = hw_to_local(hw);
8318d78a
JB		 2164 struct ieee80211_rate *rate = NULL;
2165 struct ieee80211_supported_band *sband;
2166
2167 if (status->band < 0 ||
13d8fd2d 2168 status->band >= IEEE80211_NUM_BANDS) {
8318d78a
JB		 2169 WARN_ON(1);
2170 return;
2171 }
2172
2173 sband = local->hw.wiphy->bands[status->band];
2174
2175 if (!sband ||
2176 status->rate_idx < 0 ||
2177 status->rate_idx >= sband->n_bitrates) {
2178 WARN_ON(1);
2179 return;
2180 }
2181
2182 rate = &sband->bitrates[status->rate_idx];
6368e4b1
RR		 2183
2184 /*
2185 * key references and virtual interfaces are protected using RCU
2186 * and this requires that we are in a read-side RCU section during
2187 * receive processing
2188 */
2189 rcu_read_lock();
2190
2191 /*
2192 * Frames with failed FCS/PLCP checksum are not returned,
2193 * all other frames are returned without radiotap header
2194 * if it was previously present.
2195 * Also, frames with less than 16 bytes are dropped.
2196 */
8318d78a 2197 skb = ieee80211_rx_monitor(local, skb, status, rate);
6368e4b1
RR		 2198 if (!skb) {
2199 rcu_read_unlock();
2200 return;
2201 }
2202
b580781e 2203 if (!ieee80211_rx_reorder_ampdu(local, skb))
9e72ebd6 2204 __ieee80211_rx_handle_packet(hw, skb, status, rate);
6368e4b1
RR		 2205
2206 rcu_read_unlock();
2207}
571ecf67
JB		 2208EXPORT_SYMBOL(__ieee80211_rx);
2209
2210/* This is a version of the rx handler that can be called from hard irq
2211 * context. Post the skb on the queue and schedule the tasklet */
2212void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
2213 struct ieee80211_rx_status *status)
2214{
2215 struct ieee80211_local *local = hw_to_local(hw);
2216
2217 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
2218
2219 skb->dev = local->mdev;
2220 /* copy status into skb->cb for use by tasklet */
2221 memcpy(skb->cb, status, sizeof(*status));
2222 skb->pkt_type = IEEE80211_RX_MSG;
2223 skb_queue_tail(&local->skb_queue, skb);
2224 tasklet_schedule(&local->tasklet);
2225}
2226EXPORT_SYMBOL(ieee80211_rx_irqsafe);
Linux 6.x block layer and io_uring tree(s)